JP7631253B2 - Rotating work machine - Google Patents

Description

The present invention relates to a rotating work machine such as a backhoe.

The rotating work machine disclosed in Patent Document 1 includes a rotating base, a work device provided in front of the rotating base, a battery unit, an electric motor driven by the power output from the battery unit, a hydraulic pump that discharges hydraulic oil by driving the electric motor, a radiator fan and an oil cooler fan driven by the power output from the battery unit, a radiator that cools the cooling water by the cooling air generated by the radiator fan, and an oil cooler that cools the hydraulic oil by the cooling air generated by the oil cooler fan.

JP 2021-80704 A

In the rotating work machine of Patent Document 1, as dust adheres to heat exchangers such as the radiator and oil cooler, the cooling performance of the radiator and oil cooler decreases. To maintain cooling performance, the radiator and oil cooler need to be cleaned. However, in the rotating work machine of Patent Document 1, the radiator fan and oil cooler fan are located on the outer side of the machine body of the radiator and oil cooler, which creates the problem that the radiator and oil cooler are difficult to clean.

The present invention was made to solve these problems with the conventional technology, and aims to provide a rotating work machine with excellent maintainability of the heat exchanger.

A swivel work machine according to one aspect of the present invention comprises a swivel base, a work device provided on the swivel base, an exterior cover forming a space on the swivel base in which equipment is arranged, an exhaust section provided on one side of a machine body in the exterior cover, and a cooling unit arranged on the one side of the space facing the exhaust section, the cooling unit comprising a frame having an opening, a heat exchanger arranged on the exhaust section side of the frame, on the outer side of the machine body and in a position corresponding to the opening, and a cooling unit arranged on the exhaust section side of the heat exchanger, with an intake side facing the heat exchanger and an exhaust side facing the exhaust section. and a mounting portion provided on the inside of the machine opposite the side of the frame on which the heat exchanger is located, to which a filter that captures dust in the air sucked by the fan from the inside of the machine to the opening side is removably attached, wherein air sucked by the fan from the inside of the machine passes through the filter, the heat exchanger and the fan in that order and is exhausted to the outside of the machine from the exhaust portion, the exterior cover has an inspection door that is provided to be able to be opened and closed, and the mounting portion is located at a position where the filter can be attached and detached by opening the inspection door .

The above-mentioned rotating work machine is equipped with a filter that captures dust in the air that is sucked into the heat exchanger, which improves the maintainability of the heat exchanger.

FIG. 2 is a schematic side view showing a rotating work machine. FIG. 2 is a schematic plan view showing a rotating work machine. FIG. 2 is a schematic rear view showing the rotating work machine. FIG. FIG. 2 is a plan view showing the lower running body, the swivel base, and various equipment arranged on the swivel base. FIG. FIG. 2 is a right front perspective view showing the swivel base plate, the battery unit, the electric motor, the hydraulic pump, and the electrical equipment. FIG. 2 is a block diagram showing a system of a rotating work machine. FIG. 4 is a right rear perspective view showing the swivel base plate, the battery unit, the electrical equipment, and the cooling unit. FIG. 4 is a right rear perspective view showing the swivel base, the protection mechanism, and the exterior cover. FIG. 4 is an exploded perspective view showing attachment of the cooling unit to the support frame. FIG. 4 is a rear view showing the cooling unit attached to the support frame. FIG. 4 is a right front perspective view showing the cooling unit attached to the support frame. FIG. 4 is a rear view showing the height position of the cooling unit. FIG. FIG. 2 is a view of the cooling unit as seen from the exhaust side. FIG. FIG. 2 is a view of the cooling unit as seen from the intake side. FIG. 2 is a perspective view showing the oil cooler and the radiator attached to a frame of the cooling unit. FIG. FIG. 11 is an enlarged plan view of the right bonnet portion shown in FIG. 10 with the inspection door in an open state. FIG. FIG. 11 is a perspective view of the cooling unit for illustrating attachment and detachment of a second filter. 10A and 10B are diagrams for explaining the order of attachment and detachment of a first filter and a second filter. 13 is a diagram showing that the first filter cannot be attached because the second filter has been attached first. FIG. FIG. 4 is a diagram showing a water-cooling path using a radiator. FIG. 13 is a diagram showing a duct configuration using a shroud and an access door of a cooling unit. FIG. 11 is a cross-sectional view of the right bonnet showing the duct configuration formed by the shroud and the access door of the cooling unit. FIG. 11 is a vertical cross-sectional view of the right bonnet showing a duct configuration formed by a shroud and an access door of the cooling unit. FIG. 5 is a flowchart showing a control process for a radiator fan and an oil cooler fan. FIG. 11 is a cross-sectional view of the right bonnet showing a duct configuration formed by a shroud and an access door of a cooling unit of a first modified example. 13 is a flowchart showing a control process of a first modified example. 13 is a flowchart showing a control process of a second modified example.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of the swivel work machine 1. FIG. 2 is a schematic plan view of the swivel work machine 1. FIG. 3 is a schematic rear view of the swivel work machine 1. First, the overall configuration of the swivel work machine 1 will be described. As shown in FIG. 1, the swivel work machine 1 is a backhoe or the like that is equipped with a swivel base (machine body) 2, a lower traveling body 10, and a working device 20. The swivel work machine 1 is an electric work machine that is driven by electricity. A driver's seat 8 where an operator sits is provided on the swivel base 2. The periphery of the driver's seat 8 is covered by a protection mechanism 80 such as a cabin.

In this embodiment, the direction in which the driver seated in the driver's seat 8 of the swivel work machine 1 faces (the direction of the arrow A1 in Figures 1, 2, etc.) is the front, the opposite direction (the direction of the arrow A2 in Figures 1, 2, etc.) is the rear, the left side of the driver (the near side in Figure 1, the direction of the arrow B1 in Figures 2 and 3, etc.) is the left side, and the right side of the driver (the far side in Figure 1, the direction of the arrow B2 in Figures 2 and 3, etc.) is the right side. In addition, the horizontal direction perpendicular to the front-rear direction A3 is described as the width direction B3 (see Figures 2 and 3). The direction from the center of the width direction B3 of the swivel base 2 to the right or left side is described as the width direction outward. An operable operating device 5 is provided around the driver's seat 8, and the swivel work machine 1 is operated by operating the operating device 5.

The swivel base 2 can rotate around a swivel axis (vertical axis) X that extends in the vertical direction. Specifically, the swivel base 2 is supported on the lower travel body 10 via a swivel bearing 3 so that it can rotate around the swivel axis X (swivel to the left and right). The center of the swivel bearing 3 is the swivel axis X (swivel center), and a swivel motor (not shown), which will be described later, is attached to the swivel base 2. This swivel motor is a hydraulic device M driven by hydraulic oil discharged from a hydraulic pump P, and is a motor that rotates the swivel base 2 around the swivel axis X. The swivel base 2 is provided with an exterior cover (cover) 70, brackets, stays, etc. The exterior cover 70 forms a space (rear room R) at the rear of the swivel base 2 in which equipment, tanks, other parts, etc. are arranged. The brackets, stays, etc. are members for attaching the above-mentioned parts, etc.

1 and 2, the lower traveling body 10 has a traveling frame 11 and a traveling mechanism 12. The traveling frame (track frame) 11 is a structure to which the traveling mechanism 12 is attached and which supports the swivel base 2 on its upper portion.
The traveling mechanism 12 is, for example, a crawler type. The traveling mechanism 12 has an idler 13, a drive wheel 14, a plurality of rollers 15, an endless crawler belt 16, and a traveling system hydraulic device M (travel motors ML, MR) driven by hydraulic oil discharged from a hydraulic pump P. The travel motors ML, MR are composed of hydraulic motors, and drive the drive wheels 14 to cause the crawler belt 16 to circulate in a circumferential direction. A dozer device 18 is attached to the front of the lower traveling body 10, and is driven up and down by the extension and contraction of a dozer cylinder C5 (M) which is a hydraulic cylinder (hydraulic actuator).

As shown in Figures 1 and 2, the working device 20 is provided on the front side of the rotating platform 2. As shown in Figure 1, the working device 20 has a boom 21, an arm 22, and a bucket (working tool) 23. The base end of the boom 21 is pivotally attached to the swing bracket 24 so as to be rotatable around a horizontal axis (axis extending in the width direction B3), and the boom 21 can swing up and down (vertical direction). The arm 22 is pivotally attached to the tip of the boom 21 so as to be rotatable around a horizontal axis, and the arm 22 can swing in the front-rear direction or up-down direction. The bucket 23 is provided at the tip of the arm 22 so as to be capable of scooping and dumping operations. The rotating work machine 1 can be equipped with another working tool (hydraulic attachment) that can be driven by hydraulic oil instead of or in addition to the bucket 23. Other examples of working tools include hydraulic breakers, hydraulic crushers, angle brooms, earth augers, pallet forks, sweepers, mowers, snow blowers, etc.

As shown in FIG. 1, the swivel work machine 1 is equipped with hydraulic equipment M of the work system that operates with hydraulic oil discharged from the hydraulic pump P, and the work device 20 is driven by the operation of the hydraulic equipment M of the work system. In this embodiment, the hydraulic equipment M includes a swing cylinder C1, a boom cylinder C2, an arm cylinder C3, and a bucket cylinder C4. The swing cylinder C1, the boom cylinder C2, the arm cylinder C3, and the bucket cylinder C4 are configured as hydraulic cylinders (hydraulic actuators). As shown in FIG. 1, the swing bracket 24 is swingable by the extension and contraction of the swing cylinder C1 provided on the right side of the swivel base 2. The boom 21 is swingable by the extension and contraction of the boom cylinder C2. The arm 22 is swingable by the extension and contraction of the arm cylinder C3. The bucket 23 is capable of scooping and dumping operations by the extension and contraction of the bucket cylinder C4.

The hydraulic equipment M of the slewing work machine 1 is therefore the slewing motor, the travel motors ML and MR, the swing cylinder C1, the boom cylinder C2, the arm cylinder C3, and the bucket cylinder C4. The hydraulic equipment M also includes a control valve V that controls the above-mentioned hydraulic cylinders, and a hydraulic oil tank T. As shown in FIG. 2, the hydraulic oil tank T and the control valve V are located forward of the hydraulic pump P.

The swivel base 2 will be described below. Figure 4 is a left front perspective view of the swivel base 2. Figure 5 is a right rear perspective view of the swivel base 2. As shown in Figures 4 and 5, the swivel base 2 has a swivel base plate (base plate) 30, a plurality of vertical ribs 31 (first vertical rib 31a, second vertical rib 31b, third vertical rib 31c), a support bracket 32, a partition plate 33, a horizontal rib 34, and a support frame 35. The swivel base plate 30 is formed from a thick steel plate or the like, and is arranged so that the plate surface faces in the vertical direction. The swivel base plate 30 is supported on the lower running body 10 via a swivel bearing 3 so as to be rotatable around the swivel axis X.

The first vertical rib 31a, the second vertical rib 31b, and the third vertical rib 31c are members that reinforce the swivel base 30, and are provided extending in the front-rear direction A3 of the swivel base 30. The first vertical rib 31a and the second vertical rib 31b are erected on the swivel base 30 and are arranged side by side apart in the width direction B3. The first vertical rib 31a is arranged on the left side of the swivel base 30, and the second vertical rib 31b is arranged on the right side of the swivel base 30. The third vertical rib 31c is arranged between the first vertical rib 31a and the second vertical rib, and is provided extending from the rear of the swivel base 30 to the partition plate 33.

The support bracket 32 is provided in front of the first vertical rib 31a and the second vertical rib 31b. As shown in FIG. 4, the support bracket 32 and the front of the first vertical rib 31a and the second vertical rib 31b are provided in a position offset to the right from the center of the width direction B3 of the swivel base 30. As shown in FIG. 1, the swing bracket 24 is attached to the support bracket 32 so as to be swingable around a vertical axis (an axis extending in the up-down direction).

The partition plate 33 is a member that separates the lower front portion of the rear room R. The partition plate 33 has a plate surface facing the front-rear direction A3 and is disposed in the center of the swivel base plate 30 from one side (left side) to the other side (right side) in the width direction B3.
The horizontal rib 34 is a member that reinforces the swivel base plate 30, and is disposed from one side (left side) to the other side (right side) in the width direction B3 at the rear end of the swivel base plate 30. The horizontal rib 34 is erected on the swivel base plate 30, and is connected to the rear end of the first vertical rib 31a, the rear end of the second vertical rib 31b, and the rear end of the third vertical rib 31c.

The support frame 35 is disposed at the rear of the swivel base 30, and is erected rearward of the partition plate 33. For example, the support frame 35 is configured in an arch shape. The rear of the support frame 35 is located rearward of the rear of the lower running body 10. Specifically, the support frame 35 is disposed in the rear room R, and supports the exterior cover 70 and the peripheral parts disposed inside the exterior cover 70. The support frame 35 has a plurality of leg members (first leg 35a, second leg 35b, third leg 35c, fourth leg 35d, fifth leg 35e) erected on the swivel base 30, a first rod member 35h, and a second rod member 35i.

The first leg 35a is erected on the front left side of the rear room R. The first leg 35a is erected in front of the first base 40a which is provided on the rear left side of the first vertical rib 31a. The first base 40a extends from the partition plate 33 to the horizontal rib 34. The lower end of the first leg 35a extends upward from the first base 40a, extends rearward and upward at its midpoint, and bends at its upper end to extend rearward.

The second leg 35b is erected on the front right side of the rear room R. The second leg 35b is erected on the second base 40b attached to the rear right side of the partition plate 33. In other words, the lower end of the second leg 35b is located further forward than the lower end of the first leg 35a. The lower end of the second leg 35b extends upward from the second base 40b, extends rearward and upward at its midpoint, and bends at its upper end to extend rearward.

The third leg 35c is erected on the rear left side of the rear room R. The third leg 35c is erected in the center of the first base portion 40a. The lower end of the third leg 35c extends upward from the first base portion 40a and reaches the upper end of the first leg 35a.
The fourth leg 35d is erected at the rear of the rear room R. The fourth leg 35d is disposed toward the left of the rear of the rear room R and is disposed widthwise inward (to the right) of the third leg 35c. The fourth leg 35d is erected at a third base 40c provided at the left part of the horizontal rib 34. The fourth leg 35d has a lower end that extends upward from the third base 40c, a middle part that extends forward and upward, and an upper end that bends and extends forward.

The fifth leg 35e is erected at the rear of the rear room R. The fifth leg 35e is disposed to the right of the rear of the rear room R. The fifth leg 35e is erected on the fourth base 40d provided on the right of the horizontal rib 34. The fifth leg 35e has a lower end that extends upward from the fourth base 40d, a middle part that extends forward and upward, and an upper end that bends and extends forward. The upper end of the fourth leg 35d and the upper end of the fifth leg 35e are connected by a connecting plate 35f that is arranged to extend in the width direction B3. In addition, the connecting plate 35f is provided with a pair of support pillars 35g that extend forward from the front end of the connecting plate 35f. The pair of support pillars 35g are spaced apart in the width direction B3 and are arranged to correspond to the upper end of the fourth leg 35d and the upper end of the fifth leg 35e, respectively. The rear portion of the fourth leg 35 d and the rear portion of the fifth leg 35 e are located rearward of the rear portion of the lower running body 10 .

The first rod member 35h and the second rod member 35i are arranged with their plate surfaces facing the vertical direction and extending in the width direction B3. The first rod member 35h is arranged forward of the second rod member 35i. The first rod member 35h and the second rod member 35i are placed on and fixed to the upper end of the first leg 35a, the upper end of the second leg 35b, the upper end of the left support pillar 35g, and the upper end of the right support pillar 35g. The first rod member 35h supports the rear of the protection mechanism 80. The second rod member 35i supports the exterior cover 70.

The following describes the equipment mounted in the rear room R of the swivel base 2. FIG. 6 is a plan view showing the lower travel unit 10, the swivel base 30, and various equipment arranged on the swivel base 30. FIG. 7 is a right front perspective view showing the swivel base 30, the battery unit 90, the electric motor 91, the hydraulic pump P, and the electrical equipment 92. FIG. 8 is a block diagram showing the system of the swivel work machine 1. FIG. 9 is a right rear perspective view showing the swivel base 30, the battery unit 90, the electrical equipment 92, and the cooling unit CU. As shown in FIG. 8, the swivel work machine 1 includes the battery unit 90, the electric motor 91, the electrical equipment 92, the charging port 93, and the cooling unit CU. As shown in FIGS. 6, 7, and 9, the battery unit 90, the electric motor 91, the electrical equipment 92, the charging port 93, and the cooling unit CU are provided on the swivel base 2.

The battery unit 90 is an electrical device that can store electricity and output the stored electricity. As shown in FIG. 6, the battery unit 90 is disposed in the widthwise center of the rear of the swivel base 2. More specifically, the battery unit 90 is disposed from the middle of the swivel base 2 in the fore-and-aft direction A3 to the rear of the swivel base 2. In other words, the rear of the battery unit 90 is located rearward of the rear of the lower traveling body 10. Also, as shown in FIG. 2, the center of gravity of the battery unit 90 is disposed on one side (left side) of the center line Y of the swivel base 2 in the widthwise direction B3, and is disposed rearward of the protection mechanism 80.

As shown in FIG. 6, the outer periphery of the battery unit 90 is surrounded by the support frame 35. Specifically, the lower end of the first leg 35a and the lower end of the second leg 35b are located in front of the battery unit 90. The third leg 35c is located to the left of the battery unit 90. The lower end of the fourth leg 35d and the lower end of the fifth leg 35e are located behind the battery unit 90. The upper end of the first leg 35a, the upper end of the second leg 35b, the upper end of the fourth leg 35d, the upper end of the fifth leg 35e, a pair of support pillars 35g, a first rod member 35h, and a second rod member 35i are located above the battery unit 90.

As shown in FIG. 8, the electric motor 91 is a driving source driven by the power output by the battery unit 90. The electric motor 91 is a three-phase AC synchronous motor with embedded permanent magnets. The rotation speed of the electric motor 91 is controlled by, for example, the rotation speed control device 5c. The rotation speed control device 5c can set the range of the motor rotation speed of the electric motor 91 when setting the motor rotation speed of the electric motor 91 according to the current value that changes according to the operation of the operation device 5. The rotation speed control device 5c is, for example, a dial-shaped switch such as a selector switch having multiple switching positions, and the multiple switching positions are assigned target values of the rotation speed of the electric motor 91. The rotation speed control device 5c can set and operate the range of the target value of the rotation speed of the electric motor 91, for example, within a range of 1500 to 2600 rpm/min. The electric motor 91 may be another type of synchronous motor, an AC motor, or a DC motor. The rotation speed of the electric motor 91 may be operated based on a preset table according to the amount of operation of the operation device 5.

The electric motor 91 rotates a drive shaft by power supplied from the battery unit 90, and transmits the drive force from the drive shaft to the hydraulic pump P. The hydraulic pump P is connected to the drive shaft of the electric motor 91, and is driven by the drive force transmitted from the drive shaft. In other words, the hydraulic pump P is driven by the drive of the electric motor 91 to discharge hydraulic oil.
As shown in Fig. 2, the electric motor 91 and the hydraulic pump P are disposed on the other side (right side) of the center line Y in the width direction B3 of the swivel bed 2, and as shown in Fig. 6 and Fig. 7, the electric motor 91 and the hydraulic pump P are disposed side by side in the front-rear direction A3 on the side of the battery unit 90. Specifically, the electric motor 91 and the hydraulic pump P are disposed below and on the side (right side) of the battery unit 90.

As shown in FIG. 7, the electrical components 92 are arranged in a row in the width direction B3 above the battery unit 90. As shown in FIG. 8, the electrical components 92 are directly or indirectly connected to the battery unit 90, and are devices that transmit the power supplied by the battery unit 90 or operate using the power. The electrical components 92 are, for example, a junction box 92a, an inverter 92b, and a DC/DC converter 92c. The junction box 92a is connected to the battery unit 90 and other devices including the inverter 92b, and transmits the power supplied from the battery unit 90 to the other devices.

The inverter 92b is provided in the power supply path 132 from the battery unit 90 to the electric motor 91, and adjusts the power output to the electric motor 91. In this embodiment, the inverter 92b is connected to the junction box 92a and the electric motor 91. The inverter 92b is a device that drives the electric motor 91, converts DC power to three-phase AC power, and supplies the three-phase AC power to the electric motor 91. The inverter 92b can arbitrarily change the current and voltage of the power supplied to the electric motor 91.

The DC/DC converter 92c converts the voltage of the input direct current into a different voltage. In this embodiment, the DC/DC converter 92c is a step-down converter that converts the input voltage into a lower voltage. The DC/DC converter 92c is provided in, for example, the rotating work machine 1, and supplies power to an on-board battery 96 that supplies power to electronic devices.
FIG. 10 is a right rear perspective view showing the swivel base 2, the protection mechanism 80, and the exterior cover 70. As shown in FIG. 10, the exterior cover 70 includes an upper bonnet 71, a rear bonnet 72, a left bonnet 73, a right bonnet 74, and a right front bonnet 75. The upper bonnet 71 is a cover member forming the upper part of the rear room R, and is removably attached to the second rod member 35i of the support frame 35 in a state in which the upper bonnet 71 covers the battery unit 90 and the electrical equipment 92. The rear bonnet 72 is a cover member forming the rear of the rear room R, and is attached to the support frame 35. The left bonnet 73 is a cover member forming the left side of the rear room R, and is formed with an intake port 73a. The intake port 73a is, for example, configured by arranging a plurality of horizontally elongated openings in the vertical direction, but is not limited to this configuration. The right bonnet 74 is a cover member forming the right rear of the rear room R. An inspection door 76 is provided on the right bonnet 74. The inspection door 76 can be opened and closed relative to the right bonnet 74, and is provided with an exhaust section 77 for exhausting air from inside the exterior cover 70. The right front bonnet 75 is a cover member that is located in front of the right bonnet 74 and forms the right front section of the rear room R.

The charging port 93 is a socket to which a cable that stores electricity in the battery unit 90 is connected, and power is supplied from the outside. As shown in Figures 3 and 10, when connecting the charging port 93 to a cable that supplies power from the outside, a charging lid (lid member) 72a attached to the rear bonnet 72 is opened, and the charging lid 72a is exposed from the exterior cover 70. The charging lid 72a is swingably connected to the rear bonnet 72 by a hinge or the like, and can be opened and closed around the swing axis of the hinge.

As shown in FIG. 9, the cooling unit CU is attached to a fixed bracket 37 provided on a support frame 35 that is erected on the swivel base 2 .
FIG. 11 is an exploded perspective view showing the attachment of the cooling unit CU to the support frame 35. FIG. 12 is a rear view showing the state in which the cooling unit CU is attached to the support frame 35. FIG. 13 is a right front perspective view showing the state in which the cooling unit CU is attached to the support frame 35. The fixed bracket 37 includes a first vertical bar 37a, a second vertical bar 37b, and a horizontal bar 37c, which are made of steel. The first vertical bar 37a has an upper end attached to the lower surface of the rear tip of the second leg 35b and extends downward while bending. The second vertical bar 37b has an upper end attached to the bending portion of the second leg 35b and extends downward. The horizontal bar 37c has a rear end attached to a connecting bending plate 38 connected to the fifth leg 35e, and a front end attached to the lower end of the second leg 35b. The horizontal beam 37c has a lower end of the first vertical beam 37a attached to a location near the rear end thereof, and a lower end of the second vertical beam 37b attached to a location near the front end thereof. Therefore, the fixing bracket 37 is firmly fixed to the support frame 35 and can support the cooling unit CU.

The fixed bracket 37 is provided with mounting bosses 37d to which fastening members 39 such as bolts can be screwed. The mounting bosses 37d are provided at six locations in total: two at the top and bottom of the left end of the fixed bracket 37, two at the top and bottom of the right end, and two at the left and right of the bottom end. Specifically, two mounting bosses 37d are provided on each of the first vertical beam 37a, the second vertical beam 37b, and the horizontal beam 37c.

The frame 98 of the cooling unit CU has a fixing portion 98b where the cooling unit CU is fixed to the fixed bracket 37 by a fastening member 39. The fixing portion 98b is provided at a location corresponding to the mounting boss 37d of the fixed bracket 37. Specifically, the fixing portion 98b is provided at a total of six locations: two locations at the top and bottom of the left end as shown in FIG. 11, two locations at the top and bottom of the right end as shown in FIG. 13, and two locations at the left and right of the bottom end. The fixing portion 98b has a through hole 98c into which a fastening member 39 such as a bolt is inserted. The fixing portion 98b is provided at a location that does not overlap the heat exchanger CA, the fan unit FU, and the shroud 110 when viewed from the exhaust side of the cooling unit CU, as shown in FIG. 16 described later.

As shown in Fig. 11, the cooling unit CU has an attachment portion 98a to which a suspender is attached. The attachment portion 98a is, for example, an attachment hole of a size that allows the suspender to be attached. The attachment portions 98a are provided at both ends of the upper portion of the frame 98 of the cooling unit CU. Furthermore, the suspender can be removed from the attachment portion 98a when the suspending operation is no longer required.
The fixed bracket 37 also has a temporary placement portion 37e on which the cooling unit CU is temporarily placed. The temporary placement portion 37e is, for example, a steel material having an L-shaped cross section, and has a fixing portion 37e1 fixed to the horizontal bar 37c and an abutting portion 37e2 on which the cooling unit CU abuts. As shown in FIG. 12, the temporary placement portion 37e is provided at a position where the height position of the temporarily placed cooling unit CU coincides with the mounting height of the cooling unit CU to the fixed bracket 37. In other words, the mounting bosses 37d of the first vertical bar 37a and the second vertical bar 37b coincide with the through holes 98c of the frame 98, which will be described later. During the mounting work of the cooling unit CU, the cooling unit CU lifted by a crane is temporarily placed on the temporary placement portion 37e, and the cooling unit CU is fixed to the fixed bracket 37 by the fastening member 39. FIG. 14 is a rear view showing the height position of the cooling unit CU. 14, the support frame 35 and the fixing bracket 37 are omitted. As shown in Fig. 3 and Fig. 14, the cooling unit CU (a heat exchanger CA and a fan unit FU, which will be described later) is disposed above the electric motor 91 and the hydraulic pump P at the same height as the inverter 92b.

As shown in FIG. 10, the cooling unit CU is disposed at a position facing the exhaust section 77 in the space of the exterior cover 70. FIG. 15 is an exploded perspective view of the cooling unit CU. The cooling unit CU is an assembly in which the frame body 98, the heat exchanger CA, the fan unit FU, and the shroud 110 are integrated. The cooling unit CU includes a first cooling unit CU1 and a second cooling unit CU2. The first cooling unit CU1 has a radiator 94 and a radiator fan 94a described later. The second cooling unit CU2 has an oil cooler 97 and an oil cooler fan 97a described later. The heat exchanger CA is a cooling device that cools equipment, and is attached to the exhaust section 77 side of the frame body 98 and a position corresponding to the openings 98d and 98e (one side of the frame body 98, i.e., the side facing the exterior cover 70). The fan unit FU is attached to one side of the frame 98 adjacent to the heat exchanger CA with its intake side facing the heat exchanger CA. The fan unit FU has a fan F (a radiator fan 94a and an oil cooler fan 97a). The fan F is disposed on the exhaust section 77 side of the heat exchanger CA with its intake side facing the heat exchanger CA and its exhaust side facing the exhaust section 77. The shroud 110 is attached to the fan unit FU.

FIG. 16 is a view of the cooling unit CU as seen from the exhaust side. FIG.
Fig. 18 is a plan view of the cooling unit CU as viewed from the intake side. Fig. 19 is a perspective view showing the oil cooler 97 and the radiator attached to the frame of the cooling unit CU.
15 and 19 , a heat exchanger CA is attached to one surface of the frame body 98. Specifically, a radiator 94 and an oil cooler 97 are attached to one surface of the frame body 98 and aligned in the longitudinal direction of the frame body 98.

The heat exchanger CA includes a radiator 94 that cools the equipment to be cooled and an oil cooler 97 that cools the hydraulic oil that drives the working device 20. The radiator 94 is a device that cools the cooling water (refrigerant) that cools the electric motor 91 and the electrical equipment 92. The radiator 94 is provided with a water supply section 94c at its upper part to which the cooling water is supplied. The radiator 94 is cooled (heat removed) by a radiator fan 94a described later. The radiator fan 94a rotates to generate cooling air and remove heat from the radiator 94. The radiator fan 94a sucks in air around the radiator 94 and discharges it from the inside of the rear room R to the outside of the rear room R through the opening of the exterior cover 70. As a result, the cooling air that has been heat exchanged with the radiator 94 and has a higher temperature is discharged to the outside. In addition, in Figures 15 and 19, the outer surface of the radiator 94 is flat, but this is not limited to this. The outer surface of the radiator 94 may be uneven, wavy, or have multiple fins formed thereon in order to improve heat dissipation.

The oil cooler 97 is a device that cools the hydraulic oil discharged from the hydraulic pump P. The oil cooler 97 is cooled by an oil cooler fan 97a, which will be described later. The oil cooler fan 97a generates cooling air by rotating and drawing in air around the oil cooler 97, and expels the drawn-in air from the inside of the rear room R formed by the exterior cover 70 to the outside.

As shown in FIG. 14, the radiator 94 and the oil cooler 97 are disposed above the hydraulic pump P and the electric motor 91. As a result, the radiator fan 94a and the oil cooler fan 97a suck in the air around the battery unit 90, including the air dissipated by the battery unit 90, and the air that has dissipated heat from the hydraulic pump P and the electric motor 91 and moved upward, and discharge it to the outside of the aircraft. In addition, the water supply section 94c of the radiator 94 is disposed at the top of the water cooling path 95, and the water supply section 94c is disposed at a higher position than the radiator 94, the electric motor 91, and the electrical equipment 92 (e.g., the inverter 92b and the DC/DC converter 92c).

As shown in FIG. 18, the frame 98 is a steel plate that is substantially rectangular when viewed in the direction of arrow B1, and as shown in FIG. 19, has a bottom surface portion 98f whose lower end side is bent and extended in the direction of arrow B2. The frame 98 also has openings 98d, 98e formed at locations where the radiator 94 and oil cooler 97 that constitute the cooling unit CU face each other. In other words, the openings 98d, 98e of the frame 98 are arranged side by side (in the front-to-rear direction A3). One opening 98d is about the same size as the radiator 94. The other opening 98e is about the same size as the oil cooler 97.

As shown in FIG. 15, a fan unit FU is attached to one side of the frame body 98. The fan unit FU includes a radiator fan 94a for cooling the radiator 94, an oil cooler fan 97a for cooling the oil cooler 97, and a mounting frame 99 to which the radiator fan 94a and the oil cooler fan 97a are attached side by side. The mounting frame 99 is a substantially gate-shaped frame body having a mounting plate portion 99a and legs 99b that bend and extend from both ends toward the frame body 98. The oil cooler fan 97a and the radiator fan 94a are attached to the mounting plate portion 99a side by side in the longitudinal direction (front-rear direction A3) of the fan unit FU. A circular opening facing the oil cooler 97 is formed at the location of the mounting plate portion 99a where the oil cooler fan 97a is located. Additionally, a circular opening facing the radiator 94 is formed at the location of the mounting plate portion 99a where the radiator fan 94a is located. As described above, the fan unit FU is attached to one side of the frame 98 with the intake side of the radiator fan 94a facing the radiator 94 and the intake side of the oil cooler fan 97a facing the oil cooler 97.

15 to 17, the shroud 110 is attached to the mounting frame 99 of the fan unit FU so as to surround both the radiator fan 94a and the oil cooler fan 97a. The shroud 110 guides the cooling air generated by the radiator fan 94a and the cooling air generated by the oil cooler fan 97a.
The shroud 110 includes a square cylindrical fixed portion 111 that surrounds both the radiator fan 94a and the oil cooler fan 97a, and a guide portion 112 that extends outward from the fixed portion 111 on the exhaust side and guides the cooling air generated by the operation of the radiator fan 94a and the cooling air generated by the operation of the oil cooler fan 97a.

Figure 20 is a perspective view of the shroud. Figure 21 is a cross-sectional view of the shroud. As shown in Figures 15, 20, etc., the fixing part 111 is a rectangular cylindrical frame having an upper side 111a, a left side 111b, a lower side 111d, and a right side 111c. Both the radiator fan 94a and the oil cooler fan 97a are surrounded by this rectangular cylindrical frame (fixing part 111).

As shown in Figures 15, 16, 21, etc., the lower side 111d is provided with a first elastic support 113 that supports the lower part of the case of the radiator fan 94a, and a second elastic support 114 that supports the lower part of the case of the oil cooler fan 97a. Specifically, as shown in Figure 20, the lower side 111d has a first notch 115 at a location corresponding to the lower part of the case of the radiator fan 94a, and a second notch 116 at a location corresponding to the lower part of the case of the oil cooler fan 97a. The first elastic support 113 is provided in the first notch 115, and the second elastic support 114 is provided in the second notch 116.

The guide portion 112 has a downwardly inclined extension portion 112a that extends diagonally downward outward from the end of the lower side portion 111d of the fixed portion 111, and a right-side bent extension portion 112b that bends and extends from the end of the right side portion 111c of the fixed portion 111 toward the opening side of the fixed portion 111. As shown in FIG. 21, the protruding length L11 of the right-side bent extension portion 112b from the fixed portion 111 is shorter than the protruding length L12 of the downwardly inclined extension portion 112a from the fixed portion 111.

As shown in Figures 17 and 18, the other side of the frame 98 opposite to the one side (i.e., the side opposite to the side facing the exterior cover 70) is provided with a filter 100 and a mounting portion 105 to which the filter 100 is attached. The filter 100 includes a first filter 100A for the radiator 94 and a second filter 100B for the oil cooler 97. The filter 100 is an air filter that captures dust in the air sucked into the opening side by the fan F.

The mounting portion 105 is provided on the opposite side of the frame body 98 from the side where the heat exchanger CA is arranged. The first filter 100A and the second filter 100B are arranged side by side in the longitudinal direction (front-rear direction A3) of the frame body 98. Specifically, as shown in FIG. 18, the mounting portion 105 has a holding portion 107 having two vertical rod portions 105a, a regulating horizontal rod 105b, and a support rod portion 105c. That is, the mounting portion 105 has a first holding portion 107A and a second holding portion 107B. One vertical rod portion 105a is fixed vertically to a location on the left end side of the other side of the frame body 98. The other vertical rod portion 105a is fixed vertically to a location on the right end side of the other side of the frame body 98. The support rod portion 105c is fixed laterally (in the front-rear direction A3) to the lower end side of the other side of the frame body 98, and supports the filter 100 attached to the attachment portion 105. The restricting horizontal rod 105b has one end fixed to the outer surface of the upper end of one vertical rod portion 105a, and the other end fixed to the outer surface of the upper end of the other vertical rod portion 105a, and restricts the filter 100 attached to the attachment portion 105 from falling over. The protruding length of the two vertical rod portions 105a from the other side of the frame body 98 is slightly greater than the thickness of the filter 100. The protruding length of the support rod portion 105c from the other side is slightly greater than the thickness of the filter 100. In this way, the first filter 100A and the second filter 100B can be held side by side in the space surrounded by the two vertical rods 105a, the horizontal restricting rod 105b, and the support rod 105c on the other side of the frame 98. The first holding portion 107A holds one of the first filter 100A and the second filter 100B inserted into the attachment/detachment opening 106 at a first position P1 away from the attachment/detachment opening 106 so that it can slide in the arrangement direction of the first filter 100A and the second filter 100B (front-rear direction A3). The second holding portion 107B holds the other of the first filter 100A and the second filter 100B inserted into the attachment/detachment opening 106 while the first holding portion 107A holds the first filter 100A and the second filter 100B.

The attachment portion 105 has, for example, at the top, an attachment/detachment opening 106 through which the filter 100 is inserted and removed. As shown in FIG. 17, the attachment/detachment opening 106 is rectangular and opens upward. FIG. 22 is an enlarged plan view of a portion of the right bonnet 74 with the inspection door 76 shown in FIG. 10 in an open state. The attachment portion 105 is configured so that the filter 100 can be attached and detached when the inspection door 76 is in an open state. In other words, when the inspection door 76 is in an open state, the attachment/detachment opening 106 of the attachment portion 105 is exposed, and the filter 100 is attached to and detached from the attachment portion 105 through the attachment/detachment opening 106.

As shown in Figs. 16, 17 and 19, the first filter 100A and the second filter 100B each have a gripping portion 101 that is gripped when attaching or detaching the filter to or from the attachment portion 105. Fig. 23 is a perspective view of the cooling unit CU to explain the attachment and detachment of the second filter. Fig. 24 is a diagram to explain the order of attachment and detachment of the first filter and the second filter. As shown in Figs. 23 and 24, the gripping portion 101 of the first filter 100A and the gripping portion 101 of the second filter 100B each have a bent portion 101b formed by bending the tip side of the extension portion 101a that extends above the attachment/detachment opening 106 when the first filter 100A and the second filter 100B are attached to the attachment portion 105.

The bent portion 101b is provided with a fastener 102 for fastening to the mounting portion 105. The fastener 102 is, for example, a thumbscrew. A female screw 98g is provided at each location corresponding to each bent portion 101b at the upper end of the frame body 98. When the first filter 100A is mounted to the mounting portion 105, the fastener 102 of the first filter 100A is screwed into the female screw portion 98g of the frame body 98, thereby fastening the first filter 100A to the mounting portion 105. When the second filter 100B is mounted to the mounting portion 105, the fastener 102 of the second filter 100B is screwed into the female screw portion 98g of the frame body 98, thereby fastening the second filter 100B to the mounting portion 105.

Here, the dimensional relationship between the first filter 100A, the second filter 100B, the attachment/detachment opening 106 and the holding portion 107 of the attachment portion 105, and the attachment/detachment order will be described. The longitudinal length L21 of the attachment/detachment opening 106 is smaller than the aligned length L20 of the first filter 100A and the second filter 100B (i.e., the length between the two vertical bar portions 105a), and is larger than the length L22 of the first filter 100A and the length L23 of the second filter 100B. In other words, the first filter 100A and the second filter 100B cannot be inserted into the attachment/detachment opening 106 at the same time, and the first filter 100A and the second filter 100B must be inserted into the attachment/detachment opening 106 separately. Moreover, when attaching to the attachment portion 105, it is necessary to insert the first filter 100A first and then the second filter 100B, and the reverse order cannot be used. Furthermore, when removing the filter from the mounting portion 105, the second filter 100B must be removed first, and then the first filter 100A; the filters cannot be removed in the reverse order.

(i) When attaching the first filter 100A and the second filter 100B, the worker inserts the first filter 100A through the attachment/detachment opening 106 (i.e., inserts it in the insertion direction IA), slides the inserted first filter 100A parallel to the frame body 98 to the first position P1 (i.e., slides it in the sliding direction SA), and screws the fastener 102 of the first filter 100A into the female threaded portion 98g of the frame body 98. Next, the worker inserts the second filter 100B through the attachment/detachment opening 106 (i.e., inserts it in the insertion direction IA), and screws the fastener 102 of the second filter 100B into the female threaded portion 98g of the frame body 98. As a result, the first filter 100A and the second filter 100B are attached to the attachment portion 105 side by side.

(ii) When removing the first filter 100A and the second filter 100B, the worker releases the fasteners 102 of the second filter 100B from the female screw portion 98g of the frame body 98, and pulls out the second filter 100B through the attachment/detachment opening 106 (i.e., pulls out the second filter 100B in the opposite direction to the insertion direction IA).
The female screw 98g is released, and the first filter 100A in the first position P1 is slid parallel to the frame 98 (i.e., slid in the opposite direction to the sliding direction SA) to position it in the attachment/detachment opening 106, and the first filter 100A is removed from the attachment/detachment opening 106 (i.e., removed in the opposite direction to the insertion direction IA).

Here, the configuration for preventing the erroneous installation of the filter 100 will be described with reference to FIG. 25. FIG. 25 is a diagram showing that the first filter 100A cannot be installed because the second filter 100B has been installed first. If the second filter 100B is inserted through the attachment/detachment opening 106 before the first filter 100A, the bent portion 101b of the second filter 100B interferes with the attachment/detachment opening 106 even if the second filter 100B is slid toward the first position P1 parallel to the frame body 98. Therefore, the free length L30, which is the length in the longitudinal direction of the attachment/detachment opening 106 where the second filter 100B is not positioned, is smaller than the length L22 of the first filter 100A. In this state, the first filter 100A cannot be inserted into the attachment/detachment opening 106. This makes it possible to prevent the first filter 100A and the second filter 100B from being erroneously installed.

Here, the water-cooling path 95 by the radiator 94 will be described. FIG. 26 is a diagram showing the water-cooling path 95 by the radiator 94. As shown in FIG. 26, the slewing work machine 1 is provided with a water-cooling path 95 that connects the radiator 94, the electric motor 91, and the electrical equipment 92 (for example, the inverter 92b and the DC/DC converter 92c), and that flows the refrigerant cooled by the radiator 94, as well as the refrigerant that has undergone heat exchange by the electric motor 91 and the electrical equipment 92. The water-cooling path 95 is provided with a cooling pump 95a that discharges cooling water and circulates the cooling water as a refrigerant. In this embodiment, the water-cooling path 95 circulates the cooling water from the radiator 94 through the cooling pump 95a, the inverter 92b, the DC/DC converter 92c, and the electric motor 91 to the radiator 94. Specifically, the water cooling path 95 includes a feed water passage 95b, a return water passage 95c, a first water passage 95d, a second water passage 95e, and a third water passage 95f.

As shown in FIG. 12, the feed water passage 95b is a water passage that sends refrigerant from the electric motor 91, etc. to the radiator 94. More specifically, the feed water passage 95b connects the electric motor 91 and the radiator 94, and allows the refrigerant to flow from the electric motor 91 to the radiator 94. The return water passage 95c is a water passage that returns the refrigerant from the radiator 94 to the cooling pump 95a. More specifically, the return water passage 95c connects the radiator 94 and the cooling pump 95a, and allows the refrigerant to flow from the radiator 94 to the cooling pump 95a.

The first water passage 95d connects the cooling pump 95a and the inverter 92b, and allows the coolant to flow from the cooling pump 95a to the inverter 92b. The second water passage 95e connects the inverter 92b and the DC/DC converter 92c, and allows the coolant to flow from the inverter 92b to the DC/DC converter 92c. The third water passage 95f connects the DC/DC converter 92c and the electric motor 91, and allows the coolant to flow from the DC/DC converter 92c to the electric motor 91. That is, the cooling water cooled by the radiator 94 returns to the radiator 94 through the return water passage 95c, the cooling pump 95a, the first water passage 95d, the inverter 92b, the second water passage 95e, the DC/DC converter 92c, the third water passage 95f, the electric motor 91, and the feed water passage 95b.

Here, the duct structure of the cooling unit CU, which is made up of the shroud 110 and the inspection door 76, will be described. Figure 27 is a diagram showing the duct configuration made up of the shroud 110 and the inspection door 76 of the cooling unit CU. In Figure 27, the inspection door 76 is shown with the exhaust section 77 removed in order to explain the duct configuration. Figure 28 is a cross-sectional view of the right bonnet showing the duct configuration made up of the shroud 110 and the inspection door 76 of the cooling unit CU. Figure 29 is a vertical cross-sectional view of the right bonnet showing the duct configuration made up of the shroud 110 and the inspection door 76 of the cooling unit CU. Figure 30 is a diagram showing the inner side of the inspection door 76.

When the inspection door 76 is closed, the tip opening edge 110a of the shroud 110 abuts against the position surrounding the exhaust section 77 of the inspection door 76, thereby forming a duct that guides the cooling air generated by the fan to the exhaust section 77. In other words, the shroud 110 and the inspection door 76 form a duct.
The exhaust section 77 is, for example, a mesh member through which air from the cooling unit CU passes and is discharged to the outside. Note that the exhaust section 77 is not limited to a mesh member, and may be configured with a plurality of openings arranged in a predetermined direction, etc. As shown in Fig. 29, the exhaust section 77 is sized to extend downward beyond the opening of the fixing section 111 of the shroud 110.

30, the downwardly inclined extension 112a of the shroud 110 abuts against the lower edge 77a of the exhaust section 77 and the outer portion 76a of the lower edge 77a. That is, the downwardly inclined extension 112a has a portion 112a1 that abuts along the lower edge 77a of the exhaust section 77 and a portion 112a2 that abuts against the outer portion 76a of the lower edge 77a of the exhaust section 77. The downwardly inclined extension 112a of the shroud 110 may abut against the lower edge 77a of the exhaust section 77. That is, the downwardly inclined extension 112a may abut against the lower edge 77a of the exhaust section 77. The downwardly inclined extension 112a of the shroud 110 may also abut against the outer portion 76a of the lower edge 77a of the exhaust section 77. In other words, the downward inclined extension 112a may abut along the outer portion 76a of the lower edge 77a of the exhaust section 77.

As shown in Figs. 10 and 27, the inspection door 76 is provided with an opening/closing handle 78. The inspection door 76 can be opened by opening the opening/closing handle 78. As shown in Figs. 10, 22, and 28, the inspection door 76 has an opening/closing shaft 76b that allows it to be opened and closed relative to the right bonnet 74 of the exterior cover 70. For example, the opening/closing shaft 76b is provided at the vertical boundary between the inspection door 76 and the right front bonnet 75. Specifically, as shown in Fig. 28, the opening/closing shaft 76b is provided at a location on the exterior cover 70 that corresponds to the right edge 111c of the fixing portion 111 (i.e., the right end of the shroud 110).

As shown in FIG. 30, the inspection door 76 has an elastic body 76c arranged on its inside in a position surrounding the exhaust section 77. The elastic body 76c is, for example, a seal rubber or a sponge rubber, and is arranged around the exhaust section 77. Specifically, the elastic body 76c is attached on the inside of the inspection door 76 to the lower edge portion 77a and the upper edge portion 77b of the exhaust section 77, a rib 76d erected on the first side edge 77c facing the right bent extension portion 112b, and a second side edge 77d facing the left side portion 111b of the fixed portion 111. The rib 76d abuts against the right bent extension portion 112b via the elastic body 76c.

As shown in Figures 28 and 29, when the inspection door 76 is in the closed state, the elastic body 76c elastically deforms when it comes into contact with the tip opening edge 110a of the shroud 110, thereby sealing the contact portion between the inspection door 76 and the tip opening edge 110a of the shroud 110.
In addition to the inspection door 76, the exterior cover 70 is provided with a removable lid portion 75a at a location corresponding to the water supply portion 94c. The lid portion 75a is a substantially square lid member. Specifically, the right front bonnet 75 has a substantially square opening 75c that is slightly smaller than the lid portion 75a. With the lid portion 75a attached to the opening 75c of the right front bonnet 75, it is fixed to the right front bonnet 75 by fastening members 75b such as bolts.

Here, the work of attaching the cooling unit CU will be described, taking as an example a case where the cooling unit CU is attached to the fixed bracket 37 of the support frame 35 of the swivel base 2 in the production line (main line) of the swivel work machine 1.
First, the hoisting tools are attached to the two mounting parts 98a (mounting holes) of the cooling unit CU. The hooks at the ends of the slings (wire ropes, fiber belts, chains, etc.) hung on a crane installed on the production line are hooked onto the respective hoisting tools. Then, the cooling unit CU is lifted up by the crane (for example, by two hoists) and the cooling unit CU is temporarily placed on the temporary placement part 37e of the fixed bracket 37 of the support frame 35 in a state where the front-rear direction A3 of the cooling unit CU is aligned with the fixed bracket 37 of the support frame 35 (i.e., the mounting bosses 37d at both ends of the fixed bracket 37 are aligned with the through holes 98c at both ends of the frame body 98 of the cooling unit CU). When the cooling unit CU is temporarily placed on the temporary placement part 37e, the height position of the cooling unit CU coincides with the mounting height of the cooling unit CU to the fixed bracket 37. Then, fastening members 39 such as bolts are inserted into through holes 98c of the cooling unit CU (i.e., through holes 98c formed in the fixing portion 98b of the frame body 98) and screwed to the mounting bosses 37d of the fixed bracket 37. The fastening members 39 inserted into the through holes 98c of the cooling unit CU are screwed to each of the six mounting bosses 37d of the fixed bracket 37. In this manner, the cooling unit CU is fixed to the fixed bracket 37 of the support frame 35.

The cooling unit CU may be an assembly having at least one of a cooling water hose (e.g., a supply water passage 95b, a return water passage 95c, etc.) connected to the radiator 94 and a hydraulic oil hose OH (see Figure 22) connected to the oil cooler 97 attached thereto.
As shown in Fig. 8, the revolving work machine 1 includes a control device 120 and a storage unit 121. The control device 120 is a device configured from electric and electronic circuits, programs stored in a CPU, etc., and controls various devices of the revolving work machine 1. For example, the control device 120 controls the rotation speed of the electric motor 91 based on the operation of a rotation speed operating device 5c that is provided around the driver's seat 8 and can be operated. The control device 120 also performs start-up control of the revolving work machine 1 based on the operation of a starter switch 7 that is provided around the driver's seat 8 and can be operated to start the revolving work machine 1.

The storage unit 121 is a non-volatile memory or the like, and stores various information related to the control of the control device 120. For example, the storage unit 121 stores information such as a table related to the rotation speed of the electric motor 91 in response to the operation amount of the rotation speed operation device 5c.
As shown in Fig. 7, Fig. 8, etc., the battery unit 90 includes a plurality of batteries 90a. The plurality of batteries 90a are connected in parallel to each other. The battery 90a is capable of storing electricity and is, for example, a secondary battery such as a lithium ion battery or a lead storage battery. The battery 90a has a plurality of cells therein, and the plurality of cells are electrically connected in series and/or in parallel. In this embodiment, the battery unit 90 has two batteries 90a. Note that the number of batteries 90a included in the battery unit 90 may be more than one, is not limited to two, and may be three or more.

As shown in FIG. 8, the slewing work machine 1 is equipped with a connection switching unit 131. The connection switching unit 131 switches the power supply path 132 from the battery 90a to the electric motor 91 between a connected state and a cut-off state for each battery 90a. The connection switching unit 131 switches between a connected state and a cut-off state, for example, by performing a relay opening/closing operation on at least a part of the power supply path 132. As a result, the battery unit 90 outputs power from the batteries 90a that are in a connected state among the multiple batteries 90a, and stops the output of power from the other batteries 90a that are in a cut-off state. The control of the connection switching unit 131, i.e., the setting of the batteries 90a that output power from the battery unit 90, is performed by the control device 120.

Each battery 90a has a BMU (battery management unit) 123 that monitors and controls the battery 90a. The BMU 123 acquires the voltage, temperature, current, and terminal voltage of the internal cells of the battery 90a, and calculates the remaining capacity of the battery 90a. The BMU 123 can also control the opening and closing of the relay inside the battery 90a, and can control the start and stop of the power supply to the battery 90a. The BMU 123 (detection unit) can also determine whether the battery unit 90 is in a charging state (i.e., charging) or a discharging state (i.e., in use) by acquiring the voltage, current, etc. of the battery 90a. The BMU 123 may be built into each battery 90a, or may be installed outside each battery 90a.

The control device 120 sets one of the batteries 90a in a connected state as an output battery that outputs power from the battery unit 90, and sets the other batteries 90a in a cut-off state as stopped batteries that do not output power. The control device 120 has a battery control unit 120a that controls the switching of the output battery.
The battery control unit 120a is connected to the connection switching unit 131 via wired or wireless communication and transmits signals to control the connection switching unit 131. In this way, the battery control unit 120a switches between the connected and disconnected states of the multiple batteries 90a and performs switching control (switching process) of the output battery and the stopped battery.

The battery control unit 120a controls the switching between the output battery and the stopped battery based on predetermined conditions. Specifically, when the operation of the working device 20 is prohibited or restricted, the battery control unit 120a sets the output battery and the stopped battery based on the selector 122 communicably connected to the control device 120 and the remaining capacity of each of the multiple batteries 90a.

The battery control unit 120a sets the battery 90a selected via the selector 122 as the output battery. On the other hand, the battery control unit 120a sets the battery 90a that is not selected via the selector 122 as the stopped battery. The selector 122 selects one battery 90a from the multiple batteries 90a based on the operator's operation. That is, the selector 122 accepts an instruction from the operator to select the battery 90a to be used as the output battery. For example, the selector 122 is a plurality of operation switches that are arranged around the driver's seat 8 and can be operated by pressing. Each of the multiple operation switches is associated with a battery 90a, and when one operation switch is operated, the battery 90a associated with that one operation switch is selected.

Furthermore, when the operation of the working device 20 is prohibited or restricted, the battery control unit 120a charges the battery unit upon receipt of a charging start instruction from the worker to the selector 122.
In addition, when the BMU 123 detects the charging state (charging) of the battery unit 90, the fan control unit 120b (control device 120) drives the radiator fan 94a and the oil cooler fan 97a at a first rotation speed determined in advance. For example, the first rotation speed is any rotation speed within a first range determined in advance. Specifically, when the BMU 123 detects the charging state of the battery unit 90, the control device 120 drives the radiator fan 94a and the oil cooler fan 97a at the first rotation speed if the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than a set temperature, and does not drive the radiator fan 94a and the oil cooler fan 97a if the temperature of the battery unit 90 is lower than the set temperature. Note that the first rotation speed is a rotation speed lower than a second rotation speed (described later) of the radiator fan 94a and the oil cooler fan 97a in the discharging state (battery output) of the battery unit 90.

As shown in FIG. 8, the rotating work machine 1 is equipped with a first drive motor 30b that drives the oil cooler fan 97a and a second drive motor 94b that drives the radiator fan 94a. The oil cooler fan 97a and the radiator fan 94a can be driven independently of each other, separate from the electric motor 91. The control of the oil cooler fan 97a and the radiator fan 94a will be described below.

The first drive motor 30b and the second drive motor 94b are each connected to the control device 120. The control device 120 has a fan control unit 120b that controls the drive of the first drive motor 30b and the second drive motor 94b. The fan control unit 120b controls the first drive motor 30b (radiator fan 94a) and the second drive motor 94b (oil cooler fan 97a) independently.

As shown in FIG. 8, the slewing work machine 1 is equipped with a water temperature detection unit 126 and an oil temperature detection unit 127. The water temperature detection unit 126 is a sensor that detects the temperature of the cooling water (refrigerant) as a voltage value. The water temperature detection unit 126 is provided, for example, in the feed water passage 95b, and detects the temperature of the cooling water heading to the radiator 94. The water temperature detection unit 126 is connected to the control device 120 by wire or wirelessly, and outputs the detected cooling water temperature information as a signal to the control device 120.

The oil temperature detection unit 127 is a sensor that detects the temperature of the hydraulic oil as a voltage value. The oil temperature detection unit 127 is provided, for example, in a pipe connected to the oil cooler 97, and detects the temperature of the hydraulic oil heading to the oil cooler 97. The oil temperature detection unit 127 is connected to the control device 120 by wire or wirelessly, and outputs the detected hydraulic oil temperature information to the control device 120 as a signal.

When the BMU 123 detects the discharged state of the battery unit 90 (battery output in progress, i.e., in use), the control device 120 drives the oil cooler fan 97a at a second rotation speed based on the temperature of the hydraulic oil detected by the oil temperature detection unit 127. For example, the second rotation speed is an arbitrary rotation speed within a predetermined second range that is higher than the first range. Specifically, when the temperature of the hydraulic oil detected by the oil temperature detection unit 127 is lower than a predetermined value, the fan control unit 120b stops driving the oil cooler fan 97a, and when the temperature of the hydraulic oil detected by the oil temperature detection unit 127 is equal to or higher than the predetermined value, the fan control unit 120b controls the temperature of the hydraulic oil not to exceed a set temperature based on a preset control map.

When the BMU 123 detects the discharge state of the battery unit 90 (battery output in progress, i.e., in use), the control device 120 drives the radiator fan 94a at the second rotation speed based on the coolant temperature detected by the water temperature detection unit 126. Specifically, the fan control unit 120b controls the drive of the radiator fan 94a based on the coolant temperature detected by the water temperature detection unit 126 and a preset control map so that the coolant temperature does not exceed a set temperature.

The slewing work machine 1 also includes an alarm device 124 that is installed around the driver's seat 8 and alerts the operator or manager. The alarm device 124 includes a display device 124a, such as a monitor that displays images, and an audio output device 124b (speaker) that issues audio notifications. The alarm device 124 notifies the remaining capacity of the multiple batteries 90a calculated by the BMU 123. The alarm device 124 also notifies the battery unit 90 of its charging status, such as that it is charging, and that the radiator fan 94a and oil cooler fan 97a are operating at a first rotation speed.

The control process by the fan control unit 120b (control device 120) will be described below with reference to FIG. 31. FIG. 31 is a flowchart showing the control process for the radiator fan and the oil cooler fan. First, the fan control unit 120b determines whether the BMU 123 has detected the charging state (charging) of the battery unit 90 (S11). If the battery unit 90 is in the charging state (charging) (S11, Yes), the fan control unit 120b determines whether the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than a set temperature (S12). If the temperature of the battery unit 90 is equal to or higher than the set temperature (S12, Yes), the fan control unit 120b drives the radiator fan 94a and the oil cooler fan 97a at a first rotation speed (S13).

In S12, if the temperature of the battery unit 90 is not equal to or higher than the set temperature ( S12 , No), that is, if the temperature of the battery unit 90 is less than the set temperature, the fan control unit 120b does not drive the radiator fan 94a and the oil cooler fan 97a (S14).
In S11, when the fan control unit 120b determines that the battery unit 90 is not in a charging state (charging) (S11, No), it determines whether or not the battery unit 90 is in a discharging state (in use) (S15). If the battery unit 90 is in a discharging state (in use) (S15, Yes), the fan control unit 120b drives the oil cooler fan 97a at a second rotation speed based on the temperature of the hydraulic oil detected by the oil temperature detection unit 127 (S16). The fan control unit 120b drives the radiator fan 94a at a second rotation speed based on the temperature of the coolant detected by the water temperature detection unit 126 (S17).

After S13, S14, or S17, the fan control unit 120b returns to the process of S11.
In S15, when the fan control unit 120b determines that the battery unit 90 is not in a discharging state (not in use) (S15, No), this process ends.
The above-mentioned swivel work machine 1 comprises a swivel base 2, a work device 20 provided on the swivel base 2, an exterior cover 70 that forms a space on the swivel base 2 in which equipment is arranged, an exhaust section 77 provided at a position on one side of the machine body (the swivel base 2) on the exterior cover 70, and a cooling unit CU that is arranged at a position facing the exhaust section 77 in the space, and the cooling unit CU comprises a frame 98 having an opening (e.g., openings 98d, 98e), a heat exchanger CA that is arranged on the exhaust section 77 side of the frame 98 at a position corresponding to the opening, a fan F that is arranged on the exhaust section 77 side of the heat exchanger CA so that the intake side faces the heat exchanger CA side and the exhaust side faces the exhaust section 77 side, and
and a filter 100 for capturing dust in the air sucked into the opening by the fan F, which is provided on the opposite side to the side where the heat exchanger CA of 8 is arranged, and which is removably attached to the filter 100. This configuration can improve the maintainability of the heat exchanger CA. The external blowing fan F is located inside the exterior cover 70, and the heat exchanger CA and the filter 100 are located behind the fan F (i.e., the filter 100, the heat exchanger CA, and the fan F are located in this order from the upstream side to the downstream side of the cooling air), so that adhesion of dust to the heat exchanger CA can be reduced and a decrease in the cooling performance of the heat exchanger CA can be prevented.

The exterior cover 70 also includes an inspection door 76 that can be opened and closed, and the attachment portion 105 is positioned so that the filter 100 can be attached and detached by opening the inspection door 76. Therefore, the filter 100 can be removed from the attachment portion 105 with the inspection door 76 in the open state, and there is no need to remove the exterior cover 70 to clean the filter 100. In this way, the filter 100 can be easily removed, so that cleaning of the filter 100 can be ensured. This provides excellent maintainability for the filter 100, the heat exchanger CA, etc.

Furthermore, since the exhaust section 77 is provided in the inspection door 76, the exhaust section 77 can be cleaned with the inspection door 76 in the open state.
Furthermore, the attachment portion 105 has an attachment/detachment opening 106 through which the filter 100 is inserted and removed, and when the inspection door 76 is in an open state, the attachment/detachment opening 106 of the attachment portion 105 is exposed, and the filter 100 is attached to and detached from the attachment portion 105 through the attachment/detachment opening 106. According to this configuration, the filter 100 can be easily attached to and detached from the attachment portion 105.

In addition, as the heat exchanger CA, a radiator 94 that cools the equipment to be cooled and an oil cooler 97 that cools the hydraulic oil that drives the working device 20 are arranged in parallel with the opening of the frame body 98, and as the fan F, a radiator fan 94a that draws air through the radiator 94 and an oil cooler fan 97a that draws air through the oil cooler 97 are provided, and the filter 100 includes a first filter 100A for the radiator 94 and a second filter 100B for the oil cooler 97, and the first filter 100A is attached to a position corresponding to the radiator 94 in the mounting portion 105, and the second filter 100B is attached to a position corresponding to the oil cooler 97 in the mounting portion 105. With this configuration, the first filter 100A and the second filter 100B can be easily attached and detached to the mounting portion 105. In addition, because the operating conditions of the radiator fan 94a and the oil cooler fan 97a are different, the degree of dirt in the first filter 100A and the second filter 100B also differ. By separating the first filter 100A and the second filter 100B, the first filter 100A and the second filter 100B can be cleaned at their respective cleaning timings.

The attachment portion 105 has an attachment/detachment opening through which the filter 100 is inserted and removed, and the longitudinal length L21 of the attachment/detachment opening 106 is shorter than the total length L20 of the first filter 100A and the second filter 100B in the arrangement direction and is longer than the lengths L22, L23 of the first filter 100A and the second filter 100B. The attachment portion 105 has a first holding portion 107A that holds one of the first filter 100A and the second filter 100B inserted into the attachment/detachment opening 106 at a first position P1 away from the attachment/detachment opening 106 so that the one can slide in the arrangement direction, and a second holding portion 107B that holds the other of the first filter 100A and the second filter 100B inserted into the attachment/detachment opening 106 while the first holding portion 107A holds the first filter 100A and the second filter 100B. This configuration allows the first filter 100A and the second filter 100B to be attached and detached in a predetermined order.

The first filter 100A and the second filter 100B each have a gripping portion 101 that is gripped when attaching or detaching the filter to or from the attachment portion 105. With this configuration, the first filter 100A can be attached or detached by gripping the gripping portion 101 of the first filter 100A, and the second filter 100B can be attached or detached by gripping the gripping portion 101 of the second filter 100B, making it easy to attach or detach the filters.

Furthermore, gripping portion 101 of first filter 100A and gripping portion 101 of second filter 100B each have a bent portion 101b formed by bending a tip side of extension portion 101a that extends above attachment/detachment opening 106 when first filter 100A and second filter 100B are attached to attachment portion 105, and bent portion 101b is provided with fastener 102 for fastening to attachment portion 105. According to this configuration, first filter 100A and second filter 100B can be fixed to attachment portion 105 by fastener 102 of bent portion 101b.

In addition, when the first filter 100A and the second filter 100B are inserted through the attachment/detachment opening 106 before the other filter, even if the other filter is to be slid toward the first position P1 in the arrangement direction, the bent portion 101b of the other filter interferes with the attachment/detachment opening 106 at a position where the free length L30, which is the length of the portion of the longitudinal direction of the attachment/detachment opening 106 where the other filter is not located, is shorter than the length of one filter in the arrangement direction (for example, the length L22 of the first filter 100A), and the other filter is prevented from sliding toward the first position P1. In this state, the first filter 100A cannot be attached to the attachment portion 105, so that the first filter 100A and the second filter 100B can be prevented from being erroneously attached. In other words, the second filter 100B and the first filter 100A can be prevented from being erroneously attached to the attachment portion 105 in that order.

The rotating work machine 1 also includes a battery unit 90, an electric motor 91 driven by the power output by the battery unit 90, an inverter 92b that adjusts the power output to the electric motor 91, and a water-cooling path 95 that circulates cooling water from the radiator 94 through one or more of the inverter 92b, the electric motor 91, and the battery unit 90 to the radiator 94. With this configuration, the cooling water in the radiator 94 is cooled by the radiator fan 94a (fan F), and the inverter 92b and the electric motor 91 can be cooled by the cooling water. The radiator fan 94a can also be used as a battery fan, and the air around the battery unit 90 can be exhausted to the outside, allowing the battery unit 90 to be air-cooled.

The battery unit 90 is disposed at the rear of the swivel base 2, the inverter 92b is disposed above the battery unit 90, the electric motor 91 is disposed to the side of the battery unit, and the heat exchanger CA and the fan F are disposed above the electric motor 91. With this configuration, the air around the inverter 92b, the air around the battery unit 90, and the air above the electric motor 91 can be exhausted to the outside of the exterior cover 70, allowing the inverter 92b and the battery unit 90 to be air-cooled.

The vehicle also includes a hydraulic pump P that discharges hydraulic oil when driven by the electric motor 91. The electric motor 91 and the hydraulic pump P are arranged side by side in the front-to-rear direction on the side of the battery unit 90, and the heat exchanger CA and the fan F are arranged above the electric motor 91 and the hydraulic pump P. With this configuration, the air around the inverter 92b, the air around the battery unit 90, and the air above the electric motor 91 and the hydraulic pump P can be discharged to the outside of the exterior cover 70, and the inverter 92b and the battery unit 90 can be air-cooled.

The above-mentioned rotating work machine 1 includes a rotating base 2, a work device 20 provided on the rotating base 2, a battery unit 90, a cooling unit CU having a fan F that draws in air from the battery unit 90 side, and a heat exchanger CA that cools a cooling target using the air drawn in by the fan F, a BMU 123 (detection unit) that detects whether the battery unit 90 is in a charging state or a discharging state, and a control device 120 that controls the operation of the fan F. When the BMU 123 detects the charging state of the battery unit 90, the control device 120 drives the fan F at a predetermined first rotation speed. According to this configuration, when the battery unit 90 is in a charging state, the heat exchanger CA can be cooled, and the fan F can also be used as a battery fan, and the air around the battery unit 90 can be discharged to the outside, thereby cooling the battery unit 90. In other words, when the battery unit 90 is in a charging state, the battery unit 90 and the heat exchanger CA can be cooled.

The battery unit 90 also includes an electric motor 91 driven by the power output by the battery unit 90, and a hydraulic pump P driven by the electric motor 91 to discharge hydraulic oil. As cooling units CU, the battery unit 90 includes a first cooling unit CU1 having a radiator fan 94a that draws in air from the battery unit 90 side and a radiator 94 that cools cooling water for cooling the equipment to be cooled using the air drawn in by the radiator fan 94a, and a second cooling unit CU2 having an oil cooler fan 97a that draws in air from the battery unit 90 side and an oil cooler 97 that cools the hydraulic oil using the air drawn in by the oil cooler fan 97a. When the BMU 123 detects the state of charge of the battery unit 90, the control device 120 drives at least one of the radiator fan 94a and the oil cooler fan 97a at a first rotation speed. According to this configuration, when the battery unit 90 is in a charged state, the radiator 94 and the oil cooler 97 can be cooled, and the radiator fan 94a and the oil cooler fan 97a can also be used as battery fans, so that the air around the battery unit 90 can be exhausted to the outside, thereby cooling the battery unit 90. In other words, when the battery unit 90 is in a charged state, the battery unit 90, the radiator 94, and the oil cooler 97 can be cooled.

The rotating work machine 1 also includes a BMU 123 (temperature detection unit) that detects the temperature of the battery unit 90. When the detection unit detects the state of charge of the battery unit 90, the control device 120 drives the radiator fan 94a and the oil cooler fan 97a at a first rotation speed if the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than a set temperature, and does not drive the radiator fan 94a and the oil cooler fan 97a if the temperature of the battery unit 90 is lower than the set temperature. With this configuration, the battery unit 90, the radiator 94, and the oil cooler 97 can be appropriately cooled according to the temperature of the battery unit 90 in a charged state.

Furthermore, the predetermined first rotation speed is a lower rotation speed than the second rotation speed of the fan F that is set to cool the cooling target when the battery unit 90 is in a discharged state. Therefore, the battery unit 90 can be charged while suppressing a temperature rise when the battery unit 90 is in a charged state.
Furthermore, when the BMU 123 (detection unit) detects the discharged state of the battery unit 90, the control device 120 controls the driving of the oil cooler fan 97a based on the temperature of the hydraulic oil detected by the oil temperature detection unit 127. According to this configuration, when the battery unit 90 is in a discharged state (i.e., in use), cooling by the oil cooler 97 can be performed according to the temperature of the hydraulic oil.

The rotating work machine 1 also includes a water temperature detection unit 126 that detects the temperature of the cooling water, and when the BMU 123 detects the discharged state of the battery unit 90, the control device 120 controls the operation of the radiator fan 94a based on the temperature of the cooling water detected by the water temperature detection unit 126. With this configuration, when the battery unit 90 is in a discharged state (i.e., in use), cooling can be performed by the radiator fan 94a according to the temperature of the cooling water.

The slewing work machine 1 also includes an exterior cover 70 that covers the battery unit 90, the electric motor 91, and the hydraulic pump P, and the radiator fan 94a and the oil cooler fan 97a exhaust air outward in the width direction from the space formed by the exterior cover 70. With this configuration, hot air around the battery unit 90, the electric motor 91, and the hydraulic pump P can be exhausted to the outside, and the temperature rise of the battery unit 90, the electric motor 91, and the hydraulic pump P can be suppressed.

<First Modification>
The first modified example will be described with reference to Fig. 32. Fig. 32 is a cross-sectional view of the right bonnet showing a duct configuration formed by the shroud 110 and the inspection door 76 of the cooling unit CU of the first modified example.
32, in the cooling unit CU of the first modification, the shroud 110 has a partition wall 117 that separates the radiator fan 94a and the oil cooler fan 97a. That is, the partition wall 117 separates a space that guides the cooling air generated by the radiator fan 94a from a space that guides the cooling air generated by the oil cooler fan 97a. Specifically, the partition wall 117 has a first extension portion 117a located in the fixed portion 111 and a second extension portion 117b located in the guide portion 112. The first extension portion 117a is connected to the upper side portion 111a and the lower side portion 111d of the fixed portion 111 in a state where it is located between the radiator fan 94a and the oil cooler fan 97a at the upper side portion 111a and the lower side portion 111d, and has a shape that extends linearly toward the exhaust portion 77. The second extension portion 117b is bent and extends from the exhaust downstream end of the first extension portion 117a in a direction approaching the oil cooler fan 97a. Therefore, the left opening width L41 and the right opening width L42 separated by the partition wall 117 are the same or approximately the same length. Specifically, the left opening width L41 is the length from the left end of the exhaust portion 77 to the second extension portion 117b. The right opening width L42 is the length from the second extension portion 117b to the right end of the exhaust portion 77. In other words, the left opening width L41 is the length from the left side portion 111b of the fixed portion 111 of the shroud 110 to the second extension portion 117b, and the right opening width L42 is the length from the second extension portion 117b to the rib 76d of the inspection door 76. Therefore, the opening size of the exhaust portion 77 on the oil cooler fan 97a side and the opening size of the exhaust portion 77 on the radiator fan 94a side can be made the same or approximately the same.

The partition wall 117 may have a shape in which the second extending portion 117b extends on an extension line of the first extending portion 117a as shown by the dashed line in Fig. 32. In this case, the opening size of the exhaust portion 77 on the oil cooler fan 97a side can be made larger than the opening size of the exhaust portion 77 on the radiator fan 94a side.
Hereinafter, the control process by the fan control unit 120b (control device 120) will be described with reference to FIG. 33. FIG. 33 is a flowchart showing the control process of the first modified example. First, the fan control unit 120b judges whether or not the partition wall 117 of the shroud 110 is present (S21). For example, if the shroud 110 has the partition wall 117, information indicating that the shroud 110 has the partition wall 117 is stored in advance in the storage unit 121. Therefore, the fan control unit 120b judges that the shroud 110 has the partition wall 117 based on this information (Yes in S21), and judges whether or not the BMU 123 has detected the charging state (charging) of the battery unit 90 (S22).

If the battery unit 90 is in a charging state (charging) (S22, Yes), the fan control unit 120b determines whether the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than the set temperature (S23). If the temperature of the battery unit 90 is equal to or higher than the set temperature (S23, Yes), the fan control unit 120b determines whether the temperature of the hydraulic oil detected by the oil temperature detection unit 127 is equal to or lower than a predetermined value (S24). If the temperature of the hydraulic oil is not equal to or lower than the predetermined value (S24, No), the fan control unit 120b drives the radiator fan 94a and the oil cooler fan 97a at a first rotation speed (S25). If the temperature of the hydraulic oil is equal to or lower than the predetermined value (S24, Yes), the fan control unit 120b drives the radiator fan 94a at the first rotation speed and does not drive the oil cooler fan 97a (S26).

In S23, if the temperature of the battery unit 90 is not equal to or higher than the set temperature (S23, No), that is, if the temperature of the battery unit 90 is less than the set temperature, the fan control unit 120b does not drive the radiator fan 94a and the oil cooler fan 97a (S27).
In S22, when the fan control unit 120b determines that the battery unit 90 is not in a charging state (charging) (S22, No), it determines whether or not the battery unit 90 is in a discharging state (in use) (S28). If the battery unit 90 is in a discharging state (in use) (S28, Yes), the fan control unit 120b drives the oil cooler fan 97a at a second rotation speed based on the temperature of the hydraulic oil detected by the oil temperature detection unit 127 (S29). The fan control unit 120b drives the radiator fan 94a at a second rotation speed based on the temperature of the coolant detected by the water temperature detection unit 126 (S30).

The fan control unit 120b returns to the process of S21 after S25, S26, S27, or S30.
In S28, if the fan control unit 120b determines that the battery unit 90 is not in a discharged state (not in use) (S28, No), or if information regarding the presence of the partition wall 117 is not stored in the memory unit 121 (S21, No), the fan control unit 120b terminates this process.

In the revolving work machine 1 of the first modification, the shroud 110 has a partition wall 117 that separates the radiator fan 94a and the oil cooler fan 97a, and the control device 120 stops driving the oil cooler fan 97a and continues driving the radiator fan 94a at the first rotation speed if the temperature of the hydraulic oil detected by the oil temperature detection unit 127 is equal to or lower than a predetermined value when the BMU 123 (detection unit) detects the charged state of the battery unit 90. With this configuration, it is possible to prevent the temperature of the hydraulic oil from dropping below a predetermined value when the battery unit 90 is in a charged state, and it is possible to continue cooling the battery unit 90 and the radiator 94 by driving the radiator fan 94a at the first rotation speed.

The above-mentioned rotating work machine 1 includes a rotating base 2, a work device 20 provided on the rotating base 2, and a cooling unit CU. The cooling unit CU is a unit that is an integrated unit of a frame 98 having openings 98d and 98e, a heat exchanger CA attached to a position corresponding to the openings 98d and 98e on one side of the frame 98, a fan unit FU arranged on the opposite side of the frame 98 with the intake side facing the heat exchanger CA, and a shroud 110 that guides the exhaust from the fan unit FU. The cooling unit CU is attached to a fixed bracket 37 provided on a support frame 35 erected on the rotating base 2. According to this configuration, the cooling unit CU can be attached to the support frame 35 on the rotating base 2 in a single assembly operation. Therefore, the productivity of the rotating work machine can be improved. For example, by configuring the cooling system, which has a large number of parts, in advance, i.e., by making it into a cooling unit CU, the assembly time on the main line can be shortened, and it can be produced in the same takt time as, for example, a diesel-powered slewing work machine, making mixed production possible. In addition, since the cooling unit CU can be removed as a whole during service maintenance, the access time to the electric motor 91 and hydraulic pump P located below the cooling unit CU can be shortened.

Furthermore, the fixing bracket 37 has a temporary placement portion 37e on which the cooling unit CU is temporarily placed during the installation work of the cooling unit CU. This configuration can assist the installation work of the cooling unit CU and makes the installation work of the cooling unit CU easier.
Furthermore, the temporary placement portion 37e is provided at a position where the height position of the temporarily placed cooling unit CU matches the mounting height of the cooling unit CU to the fixed bracket 37. According to this configuration, when the cooling unit CU is temporarily placed on the temporary placement portion 37e, the height of the cooling unit CU matches the mounting height of the cooling unit CU to the fixed bracket 37, so that it is possible to reduce the workload of positioning the cooling unit CU in the height direction. This makes it easier to perform the mounting work of the cooling unit CU.

The frame 98 also includes a fixing portion 98b where the cooling unit CU is fixed to the fixed bracket 37 by fastening members 39, and the fixing portion 98b is provided at a location that does not overlap the heat exchanger CA, the fan unit FU, or the shroud 110 when viewed from the exhaust side of the cooling unit CU. With this configuration, when attaching the cooling unit CU to the fixed bracket 37, it is easy to access the fixing portion 98b of the frame 98 of the cooling unit CU, and it is easy to fix the cooling unit CU to the fixed bracket 37 by the fastening members 39.

The cooling unit CU is an assembly to which at least one of the cooling water hoses (e.g., the feed water channel 95b, the return water channel 95c, etc.) connected to the radiator 94 and the hydraulic oil hose OH connected to the oil cooler 97 is attached. With this configuration, the cooling unit CU with at least one of the cooling water hoses and the hydraulic oil hoses attached can be attached to the fixed bracket 37 of the support frame 35 on the swivel base 2. After attaching the cooling unit CU to the fixed bracket 37, the workload of attaching the cooling water hoses, the hydraulic oil hoses, etc. can be reduced.

The frame 98 also has a mounting portion 105 on the other side opposite to the one side, on which a filter 100 is mounted to capture dust particles in the air sucked in by the fan unit FU. With this configuration, the cooling unit CU is a unit that includes the frame 98, heat exchanger CA, fan F, and shroud 110, as well as the mounting portion 105 on which the filter 100 is mounted. The filter 100 can be attached to the mounting portion 105, and the cooling unit CU with the filter 100 attached can be attached to the fixed bracket 37 of the support frame 35 on the swivel base 2.

The filter 100 also includes a first filter 100A for the radiator 94 and a second filter 100B for the oil cooler 97, and the first filter 100A and the second filter 100B are arranged in parallel with respect to the opening of the frame 98 in the mounting portion 105. With this configuration, the cooling unit CU with the first filter 100A and the second filter 100B attached can be attached to the fixed bracket 37 of the support frame 35 on the swivel base 2.

In addition, the cooling unit CU has an attachment portion 98a to which a hoisting tool is attached. According to this configuration, since the cooling unit CU has the attachment portion 98a to which a hoisting tool is attached, the cooling unit CU can be hoisted by a crane or the like using the hoisting tool attached to the attachment portion 98a, and the burden of the installation work of the cooling unit CU can be reduced.
The slewing work machine 1 also includes a battery unit 90, an electric motor 91 driven by power output from the battery unit 90, and a hydraulic pump P that discharges hydraulic oil by driving the electric motor 91, the electric motor 91 and the hydraulic pump P being disposed to the side of the battery unit 90, and the cooling unit CU being disposed to the side of the battery unit 90 and above the hydraulic pump P and the electric motor 91. With this configuration, the air around the battery unit 90 can be exhausted to the outside by the radiator fan 94a and oil cooler fan 97a of the cooling unit CU, and the battery unit 90 can be air-cooled.

The slewing work machine 1 also includes an exterior cover 70 that covers the cooling unit CU, the battery unit 90, the electric motor 91, and the hydraulic pump P, and an inspection door 76 that is openable and closable relative to the exterior cover 70 and has an exhaust section 77. The radiator fan 94a and the oil cooler fan 97a exhaust air from the space formed by the exterior cover 70 outward in the width direction through the exhaust section 77. With this configuration, the air around the battery unit 90 can be exhausted to the outside through the exhaust section 77 of the exterior cover 70 by the radiator fan 94a and the oil cooler fan 97a of the cooling unit CU, and the equipment arranged inside the exterior cover 70, such as the battery unit 90, the electric motor 91, and the hydraulic pump P, can be air-cooled.

In the above-mentioned rotating work machine 1, when the inspection door 76 is closed, the tip opening edge 110a of the shroud 110 abuts on the position surrounding the exhaust section 77 of the inspection door 76, forming a duct that guides the cooling air generated by the fan F to the exhaust section 77, so that the cooling air can be reliably exhausted to the outside from the exhaust section 77 and prevented from going around to the suction side. This improves the exhaust performance of the cooling air and the cooling performance by the cooling air. In addition, when the inspection door 76 is closed, the tip opening edge 110a of the shroud 110 only abuts on the position surrounding the exhaust section 77 of the inspection door 76, and the inspection door 76 does not have a duct member, so the inspection door 76 can be made lightweight, simple, and compact. This reduces the burden when opening and closing the inspection door 76, and there is no need to increase the strength of the holding bracket for holding the inspection door 76, so productivity is excellent and the cost can be reduced.

The inspection door 76 also includes an elastic body 76c arranged inside the inspection door 76 at a position surrounding the exhaust section 77. When the inspection door 76 is in a closed state, the elastic body 76c elastically deforms upon contact with the tip opening edge 110a of the shroud 110, sealing the contact portion between the inspection door 76 and the tip opening edge 110a of the shroud 110. With this configuration, the tip opening edge 110a of the shroud 110 and the inside of the inspection door 76 can be tightly attached, so that the cooling air can be more reliably exhausted from the exhaust section 77 to the outside and can be reliably prevented from flowing around to the suction side. The elastic body 76c can also absorb the impact when the inspection door 76 is closed, reducing the impact force and impact noise.

The heat exchanger CA includes a radiator 94 that cools the cooling water for cooling the equipment to be cooled, and an oil cooler 97 that cools the hydraulic oil that drives the working device 20. The radiator 94 and the oil cooler 97 are arranged in parallel to one side of a rectangular frame 98 with respect to an opening of the frame 98. The fan F includes a radiator fan 94a that cools the radiator 94 and an oil cooler fan 97a that cools the oil cooler 97. The radiator fan 94a and the oil cooler fan 97a are arranged in parallel to the opening of the frame 98. The shroud 110 includes a cylindrical fixed portion 111 that surrounds both the radiator fan 94a and the oil cooler fan 97a, and a guide portion that extends from the fixed portion 111 toward the exhaust portion 77 and guides the cooling air generated by driving the radiator fan 94a and the cooling air generated by driving the oil cooler fan 97a. According to this configuration, when the inspection door 76 is closed, the tip opening edge 110a of the shroud 110 abuts the position surrounding the exhaust section 77 of the inspection door 76, forming a duct that guides the cooling air generated by the radiator fan 94a and the cooling air generated by the oil cooler fan 97a to the exhaust section 77, so that both cooling airs can be efficiently exhausted to the outside from the exhaust section 77. This improves the exhaust and cooling performance of the rotating work machine.

The fixed part 111 is a rectangular cylindrical frame having an upper side 111a, a left side 111b, a lower side 111d, and a right side 111c. The rectangular cylindrical frame surrounds both the radiator fan 94a and the oil cooler fan 97a. The lower side 111d is provided with a first elastic support 113 that supports the lower part of the case of the radiator fan 94a and a second elastic support 114 that supports the lower part of the case of the oil cooler fan 97a. With this configuration, the vibration of the radiator fan 94a is reduced by the first elastic support 113 of the lower side 111d of the fixed part 111, and the vibration noise of the radiator fan 94a can be reduced. The vibration of the oil cooler fan 97a is also reduced by the second elastic support 114 of the lower side 111d of the fixed part 111, and the vibration noise of the oil cooler fan 97a can be reduced.

The lower side 111d has a first notch 115 at a location corresponding to the lower case of the radiator fan 94a, and a second notch 116 at a location corresponding to the lower case of the oil cooler fan 97a, with the first elastic support 113 provided in the first notch 115 and the second elastic support 114 provided in the second notch 116. With this configuration, the increase in the vertical dimension of the fixing part 111 can be minimized compared to the case where the first elastic support 113 and the second elastic support 114 are provided on the lower side 111d, and the fixing part 111 can be made into a minimum shape with the lower side 111d close enough to contact the lower case of the radiator fan 94a and the oil cooler fan 97a. Also, the vibration noise of the radiator fan 94a and the oil cooler fan 97a can be reduced.

The exhaust section 77 is a mesh-like member and has a size that is expanded downwardly beyond the opening of the fixed section 111, and the guide section 112 has a downwardly inclined extension section 112a that extends diagonally downward outward from the end of the lower side section 111d of the fixed section 111, and the downwardly inclined extension section 112a abuts against at least one of the lower side section 77a of the exhaust section 77 and the outer portion 76a of the lower side section 77a. With this configuration, a duct structure that matches the shape of the exhaust section 77 expanded downwardly relative to the opening of the fixed section 111 of the shroud 110 can be realized. Furthermore, the decrease in exhaust performance due to the exhaust section 77 being a mesh-like member can be compensated for by making the tip opening edge section 110a of the shroud 110 larger than the vertical width of the opening of the fixed section 111. In addition, the radiator fan 94a and the oil cooler fan 97a can be arranged at a high position. In addition, if water, debris, etc. enters the interior of the inspection door 76 from the exhaust section 77, the inclination of the downwardly inclined extension section 112a guides the water, debris, etc. out toward the inspection door 76, preventing them from entering the cooling unit CU.

The guide portion 112 has a right-side bent extension portion 112b that bends and extends from the end of the right side of the fixed portion 111 toward the opening side of the fixed portion 111, and the inspection door 76 has an opening/closing shaft 76b that allows it to be opened and closed relative to the exterior cover 70, and the opening/closing shaft 76b is provided at a location corresponding to the right side of the fixed portion 111 on the exterior cover 70, and the protruding length L11 of the right-side bent extension portion 112b from the fixed portion 111 is shorter than the protruding length L12 of the downward inclined extension portion 112a from the fixed portion 111. With this configuration, when the inspection door 76 is in the open state, a space for maintenance can be secured between the right-side bent extension portion 112b and the exterior cover 70, making maintenance work easier. For example, a handle portion (not shown) that is operated when removing the right front bonnet 75 is located between the right-side bent extension portion 112b and the exterior cover 70, making it easier to operate this handle portion.

Furthermore, since the upper bonnet 71 (upper cover) of the exterior cover 70 is removably attached to the support frame 35 erected on the swivel table 2, the upper cover can be removed without removing the protection mechanism 80 (cabin or canopy, etc.) provided on the swivel table 2, and work can be performed with the upper cover removed.
<Second Modification>
A second modified example will be described. As shown in FIG. 8, the revolving work machine 1 may be provided with a detection unit 128 such as a detection switch that detects the opening and closing of the inspection door 76. The detection unit 128 outputs a detection signal indicating the open state to the control device 120 when the inspection door 76 is in an open state, and outputs a detection signal indicating the closed state when the inspection door 76 is in a closed state. The control device 120 may control at least one of the electric motor 91, the radiator fan 94a, and the oil cooler fan 97a based on the detection signal from the detection unit 128. In the second modified example, when the detection unit 128 detects that the inspection door 76 is in an open state, the control device 120 drives the electric motor 91 at a rotation speed lower than the rotation speed when the inspection door 76 is in a closed state. Furthermore, when the detection unit 128 detects that the inspection door 76 is in an open state, the control device 120 stops the rotation of the radiator fan 94a and the oil cooler fan 97a.

The control process by the fan control unit 120b (control device 120) will be described below with reference to FIG. 34. FIG. 34 is a flowchart showing the control process of the second modified example. First, the fan control unit 120b determines whether the inspection door 76 is open or not based on the detection signal from the detection unit 128 (S41). If the detection signal indicates a closed state, the fan control unit 120b determines that the inspection door 76 is closed (S41, No), and determines whether the BMU 123 has detected the charging state (charging) of the battery unit 90 (S42).

If the battery unit 90 is in a charging state (charging) (S42, Yes), the fan control unit 120b determines whether the temperature of the battery unit 90 detected by the BMU 123 is equal to or higher than a set temperature (S43). If the temperature of the battery unit 90 is equal to or higher than the set temperature (S43, Yes), the fan control unit 120b drives the radiator fan 94a and the oil cooler fan 97a at the first rotation speed ( S44 ).

In S43, if the temperature of the battery unit 90 is not equal to or higher than the set temperature (S43, No), that is, if the temperature of the battery unit 90 is less than the set temperature, the fan control unit 120b does not drive the radiator fan 94a and the oil cooler fan 97a (S27).
In S42, when the fan control unit 120b determines that the battery unit 90 is not in a charging state (charging) (S42, No), it determines whether or not the battery unit 90 is in a discharging state (in use) (S46). If the battery unit 90 is in a discharging state (in use) (S46, Yes), the fan control unit 120b drives the oil cooler fan 97a at a second rotation speed based on the temperature of the hydraulic oil detected by the oil temperature detection unit 127 (S47). The fan control unit 120b drives the radiator fan 94a at a second rotation speed based on the temperature of the coolant detected by the water temperature detection unit 126 (S48).

In S41, if the detection signal indicates an open state, the fan control unit 120b determines that the inspection door 76 is open (S41, Yes) and determines whether the electric motor 91 is rotating (S49). For example, the rotation speed control unit 120c controls the rotation speed of the electric motor 91. Therefore, if the rotation speed control unit 120c sets the rotation speed of the electric motor 91 to a rotation speed other than "zero", the fan control unit 120b determines that the electric motor 91 is rotating (S49, Yes). If the fan control unit 120b determines that the electric motor 91 is rotating (S49, Yes), it rotates the electric motor 91 at a rotation speed lower than normal (for example, 500 rpm) (S50). If the fan control unit 120b determines that the electric motor 91 is not rotating (S49, No) or after the processing of S50, the processing of S45 is performed.

After S44, S45, or S48, the fan control unit 120b returns to the process of S41.
In S46, when the fan control unit 120b determines that the battery unit 90 is not in a discharging state (not in use) (S46, No), this process ends.
In the revolving work machine 1 of the second modified example, when the detector 128 detects that the inspection door 76 is open, the control device 120 drives the electric motor 91 at a lower rotation speed than the rotation speed when the inspection door 76 is closed. With this configuration, when the inspection door 76 is open, the power consumption of the electric motor 91 can be reduced compared to when the inspection door 76 is closed, allowing electrical energy to be used efficiently.

In addition, in the rotating work machine 1, when the detection unit 128 detects that the inspection door 76 is open, the control device 120 stops the rotation of the radiator fan 94a and the oil cooler fan 97a. With this configuration, inspection can be performed with the rotation of the radiator fan 94a and the oil cooler fan 97a stopped, and the power consumption of the radiator fan 94a and the oil cooler fan 97a can be reduced to zero, allowing for efficient use of electrical energy.

The radiator 94 also has a water supply section 94c to which cooling water is supplied at the top, and the exterior cover 70 has a removable lid section 75a at a location corresponding to the water supply section 94c, separate from the inspection door 76. With this configuration, cooling water can be supplied to the water supply section 94c of the radiator 94 by removing the lid section 75a of the exterior cover 70. In addition, since cooling water can be supplied without opening the inspection door 76, it is possible to prevent the rotation speed of the electric motor 91 from decreasing and the rotation of the radiator fan 94a and the oil cooler fan 97a from stopping due to the inspection door 76 being open.

In the above-described embodiment, an example has been described in which the present invention is applied to a rotating work machine such as a backhoe, but the application of the present invention is not limited to this, and the present invention may be applied to other construction machines such as wheel loaders, compact track loaders, and skid steer loaders, and may be applied to agricultural machines such as tractors, combines, rice transplanters, and lawn mowers.
Although the present invention has been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

REFERENCE SIGNS LIST 1 Swivel work machine 2 Swivel base 20 Work device 30 Oil cooler 30a Oil cooler fan 35 Support frame 37 Fixing bracket 37e Temporary placement portion 39 Fastening member 70 Exterior cover 73a Air intake 75a Lid portion 76 Inspection door 76c Elastic body 77 Exhaust portion 90 Battery unit 91 Electric motor 92b Inverter 94 Radiator 94c Water supply portion 94a Radiator fan 97 Oil cooler 97a Oil cooler fan 98 Frame 98a Mounting portion 98d Opening 98e Opening 100 Filter 100A First filter 100B Second filter 101 Grip portion 101a Extension portion 101b Bending portion 102 Fixing tool 105 Mounting portion DESCRIPTION OF SYMBOLS 106 Attachment/detachment opening 110 Shroud 110a Tip opening edge 111 Fixation portion 111a Upper side portion 111b Left side portion 111d Lower side portion 111c Right side portion 112 Guide portion 112a Downward inclined extension portion 112b Right bent extension portion 113 First elastic support 114 Second elastic support 115 First notch portion 116 Second notch portion 117 Partition wall 120 Control device 123 BMU (detection portion, temperature detection portion)
126 Water temperature detection unit 127 Oil temperature detection unit 128 Detection unit CA Heat exchanger (cooling device)
CU Cooling unit CU1 First cooling unit CU2 Second cooling unit F Fan P Hydraulic pump

Claims (13)

A swivel base,
A working device provided on the swivel base;
an exterior cover that forms a space in which equipment is placed on the swivel base;
An exhaust section provided at a position on one side of the aircraft body in the exterior cover;
a cooling unit disposed at a position on the one side of the space and facing the exhaust section,
The cooling unit comprises:
A frame having an opening;
a heat exchanger disposed on the exhaust side of the frame, that is, on the outer side of the aircraft body, at a position corresponding to the opening;
a fan disposed on the exhaust side of the heat exchanger such that an intake side faces the heat exchanger and an exhaust side faces the exhaust side;
a filter receiving portion for receiving a filter that is provided on an inside side of the frame opposite to the side on which the heat exchanger is disposed, the filter receiving portion receiving a filter that captures dust in the air sucked from the inside side of the frame to the opening side by the fan in a detachable manner ;
Air drawn in from inside the aircraft by the fan passes through the filter, the heat exchanger, and the fan in this order, and is discharged to the outside of the aircraft through the exhaust section,
The exterior cover includes an inspection door that can be opened and closed.
The mounting portion is a swivel working machine that is disposed at a position where the filter can be attached and detached by opening the inspection door . 2. A rotating work machine according to claim 1 , wherein the exhaust section is provided in the inspection door. the mounting portion has an attachment/detachment opening through which the filter is inserted and removed,
3. The slewing work machine according to claim 1, wherein the attachment/detachment opening of the mounting part is exposed when the inspection door is in an open state, and the filter is attachable to and detachable from the mounting part through the attachment/detachment opening. As the heat exchanger, a radiator that cools cooling water that cools a cooling target device and an oil cooler that cools hydraulic oil that drives the working device are arranged in parallel with the opening of the frame,
The fan includes a radiator fan that draws air through the radiator, and an oil cooler fan that draws air through the oil cooler,
The filter includes a first filter for the radiator and a second filter for the oil cooler,
A rotating work machine according to any one of claims 1 to 3 , wherein the first filter is attached to the mounting portion at a position corresponding to the radiator, and the second filter is attached to the mounting portion at a position corresponding to the oil cooler. the mounting portion has an attachment/detachment opening through which the filter is inserted and removed,
a longitudinal length of the attachment/detachment opening is shorter than a total length of the first filter and the second filter in an arrangement direction, and is longer than the length of either the first filter or the second filter;
The rotating work machine of claim 4, wherein the mounting portion has a first holding portion that holds one of the first filter and the second filter inserted into the attachment/detachment opening so that the one can slide in the arrangement direction at a first position away from the attachment/detachment opening, and a second holding portion that holds the other of the first filter and the second filter inserted into the attachment/detachment opening while the first filter and the second filter are held in the first holding portion. 6. The rotating work machine according to claim 4 , wherein the first filter and the second filter each have a gripping portion that is gripped when the first filter and the second filter are attached to or detached from the mounting portion. the grip portion of the first filter and the grip portion of the second filter each have a bent portion formed by bending a tip side of an extension portion that extends upward beyond the attachment/detachment opening when the first filter and the second filter are attached to the attachment portion,
The rotating work machine according to claim 6 , further comprising a fastener for fastening the bent portion to the mounting portion. A rotating work machine as described in claim 7, wherein when one of the first and second filters is inserted through the attachment/detachment opening before the other filter, even if an attempt is made to slide the other filter in the alignment direction toward the first position, the bent portion of the other filter interferes with the attachment/detachment opening at a position where the free length, which is the length of the portion of the longitudinal direction of the attachment/detachment opening where the other filter is not positioned, is shorter than the length of the one filter in the alignment direction, thereby preventing the other filter from sliding toward the first position. As the heat exchanger, a first heat exchanger and a second heat exchanger which cool different cooling targets are arranged in parallel with each other with respect to the opening of the frame,
The fan includes a first fan that draws air inside the aircraft through the first heat exchanger, and a second fan that draws air inside the aircraft through the second heat exchanger,
the filters include a first filter for the first heat exchanger and a second filter for the second heat exchanger;
The first filter is attached to the mounting portion at a position corresponding to the first heat exchanger, and the second filter is attached to the mounting portion at a position corresponding to the second heat exchanger, and
A slewing work machine as described in any one of claims 1 to 3, wherein the second filter is attached at a position corresponding to the first heat exchanger in the attachment portion, and has an anti-misattachment structure that prevents the first filter from being attached at a position corresponding to the second exchanger in the attachment portion. A battery unit;
an electric motor driven by the power output from the battery unit;
an inverter that adjusts the power output to the electric motor;
a water-cooling path that circulates the cooling water from the radiator through one or more of the inverter, the electric motor, and the battery unit to the radiator;
The rotating work machine according to any one of claims 4 to 8 , further comprising: The battery unit is disposed at the rear of the swivel base,
the inverter is disposed above the battery unit,
the electric motor is disposed to the side of the battery unit,
The rotating work machine according to claim 10, wherein the heat exchanger and the fan are disposed above the electric motor. a hydraulic pump driven by the electric motor to discharge hydraulic oil;
The electric motor and the hydraulic pump are arranged side by side in a front-rear direction on a side of the battery unit,
12. The rotating work machine according to claim 11, wherein the heat exchanger and the fan are disposed above the electric motor and the hydraulic pump. The rotating work machine according to any one of claims 1 to 12, wherein the exterior cover has an intake port on the side opposite to the side on which the exhaust section is located.

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