JP5564673B2 - Electric drive construction machine - Google Patents

Description

  The present invention relates to an electrically driven construction machine such as a hydraulic excavator that drives a hydraulic pump using an electric motor.

  As a hydraulic excavator for construction machinery that supports indoor work and underground work where the effects of exhaust gas and noise are problematic, it drives a hybrid hydraulic excavator that uses both an engine and a generator motor, and an electric motor that is connected to an external power source and cable, etc. An electrically driven hydraulic excavator as a source has been proposed.

  As a hybrid hydraulic excavator, an engine is disposed laterally behind the upper surface of the upper swing body, and the battery is charged with electric power generated by a generator motor that uses this engine as a power source. In some cases, the electric motor is driven to drive the hydraulic pump for driving the work machine (see, for example, Patent Document 1).

  In this conventional hybrid hydraulic excavator, an inverter is disposed in an intake chamber in an engine room for the purpose of performing battery temperature management and sufficiently exhibiting battery performance.

JP 2002-227241 A

  In general, in hybrid hydraulic excavators and electrically driven hydraulic excavators, it is necessary to install a power storage device including an inverter and a battery for storing electric power, a control device for controlling an electric part, and the like. Location is a problem.

  On the other hand, from the viewpoint of manufacturing cost, it is required to determine the installation location of these control devices by effectively using the configuration of a conventionally used engine-driven hydraulic excavator.

  Therefore, in the hybrid hydraulic excavator described above, an inverter is arranged on the intake side of the radiator in the engine room by using a part of the configuration of the conventional hydraulic excavator, and cool air or engine cooling air for cooling the cab is supplied. Used to cool.

  However, when the capacity of the engine is large, an inverter or the like cannot be arranged on the intake side of the radiator. Therefore, a fuel tank on the right side of the upper swing body that is not necessary in the case of an electrically driven construction machine is arranged. In order to arrange control devices such as inverters at the positions where they are located and to cool these control devices, for example, it is conceivable that air is taken in from the lower side of the control device and discharged upward.

  However, when the control device is arranged on the right front side of the upper swing body, since the warm air after cooling the engine or the electric motor enters these control devices, the control device or the like cannot be sufficiently cooled. For example, power storage devices such as lithium ion batteries and capacitors often have an ambient ambient temperature of 50 ° C. to 70 ° C. as a use upper limit value from the viewpoint of preventing electrolyte leakage due to a decrease in strength of the outer casing, and the above-described control. In the case of arrangement of equipment, there is a concern that the use upper limit may be exceeded.

  The present invention has been made based on the above-mentioned matters, and its purpose is to increase the cooling efficiency of the inverter and other control devices arranged on the front right side of the upper swing structure and to ensure the reliability of these control devices. It is to provide an electrically driven construction machine that can be used.

In order to achieve the above object, the first invention comprises a lower traveling body and an upper revolving body that is pivotably mounted on the lower traveling body. The upper revolving body includes a bottom plate and a bottom plate. Left and right center beams extending in the front-rear direction near the center, a plurality of overhanging beams extending outward in the left-right direction from the center beam, and extending in the front-rear direction joined to the distal end side of the overhanging beam A revolving frame composed of left and right side beams and an under cover provided between the bottom plate and the side beam; and a main motor provided on the rear side of the revolving frame and driven by receiving electric power from the outside. An electrically driven construction machine comprising: an accommodated electric motor room; a hydraulic pump provided on a side of the main motor on the swivel frame; and a control panel provided in front of the hydraulic pump In the control panel, provided with a housing for accommodating the control devices, the control board of the housing is fixed on the projecting beam of the rotating frame, and the under cover of the rotating frame and the bottom plate of the housing A space through which the cooling air in the motor chamber flows is formed , an air discharge hole is provided in the upper part of the casing of the control panel , an air introduction hole is provided in the bottom of the casing , and a cooling air introduction duct is provided in the air introduction hole. Are connected to each other, and the opening on the other side of the cooling air introduction duct is opened to the outside of the upper revolving body through a hole provided in the under cover to guide outside air into the control panel. and those placed as.

Further, the second invention comprises a lower traveling body and an upper revolving body that is rotatably mounted on the lower traveling body, and the upper revolving body extends in the front-rear direction near the center of the bottom plate and the bottom plate. The left and right center beams erected, a plurality of projecting beams extending from the center beam to the outside in the left-right direction, the left and right side beams extending in the front-rear direction joined to the distal end side of the projecting beam, A revolving frame comprising an under cover provided between a bottom plate and the side beam, a motor chamber that is provided on the rear side of the revolving frame and houses a main motor that is driven by receiving electric power from the outside, and a hydraulic pump provided on the side of the main motor on the revolving frame, the electrically driven construction machine that includes a control panel provided in front of the hydraulic pump, the control panel A housing for housing the control device, and the housing of the control panel is fixed on the overhanging beam of the swivel frame, and is disposed between the bottom plate of the housing and the under cover of the swivel frame. A space through which cooling air flows is formed , an air discharge hole is provided at the top of the housing of the control panel , an air introduction hole is provided at the bottom of the housing , and one side of the cooling air introduction duct is connected to the air introduction hole. The other side opening of the cooling air introduction duct is opened from the side of the upper revolving body through the hole provided in the side beam so as to guide the outside air into the control panel. Shall be.

  According to the present invention, the control panel containing the inverter and other control devices is arranged on the front right side of the upper swing body, and the cooling wind introduction duct communicating with the outside air is provided at the bottom of the control panel. It is possible to provide an electrically driven construction machine in which the cooling efficiency of the stored control equipment is increased and the reliability of these equipment is ensured.

1 is a perspective view showing a hydraulic excavator according to an embodiment of an electrically driven construction machine of the present invention. It is a side view which abbreviate | omits a working machine in the hydraulic shovel shown in FIG. FIG. 3 is a plan view of the hydraulic excavator shown in FIG. 2. FIG. 3 is an enlarged side view of the front right side of the upper swing body constituting the hydraulic excavator shown in FIG. 2. It is a front section expanded sectional view showing the control panel which constitutes one embodiment of the electrically driven construction machine of the present invention. It is an enlarged side view of the front right side of the upper swing body in another embodiment of the electrically driven construction machine of the present invention. It is a side part expanded sectional view which shows the control panel which comprises other embodiment of the electrically driven construction machine of this invention.

Hereinafter, an embodiment of an electrically driven construction machine of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of an electrically driven construction machine according to the present invention. FIG. 1 is a perspective view showing a hydraulic excavator according to an embodiment of the electrically driven construction machine of the present invention. FIG. 3 is a side view in which the working machine is omitted from the hydraulic excavator shown in FIG. 1, and FIG. 3 is a plan view of the hydraulic excavator shown in FIG.

  In FIG. 1, reference numeral 1 denotes a hydraulic excavator as an electrically driven construction machine. The hydraulic excavator 1 is a self-propelled lower traveling body 2, is mounted on the lower traveling body 2 so as to be able to turn, and an upper revolving body 3 that forms a vehicle body with the lower traveling body 2, and the upper revolving body 3 And a front device 4 attached to the front portion of the front device 4 so as to be pivotable in the up-down direction (can be moved up and down).

  The front device 4 has a multi-joint structure, and is provided with a boom 4A that can pivot in the vertical direction, an arm 4B that is pivotally provided at the tip of the boom 4A, and a pivot that is pivotable at the tip of the arm 4B. 4C, and a boom cylinder 4D, an arm cylinder 4E, and a bucket cylinder 4F that drive these buckets.

  The revolving frame 5 serves as a base of the upper revolving structure 3, and as shown in FIGS. 2 and 3, a bottom plate 5A made of a thick steel plate and extending in the front-rear direction, and a center side of the bottom plate 5A in the front-rear direction. The left and right center beams 5B, 5B extending in the vertical direction, a plurality of overhanging beams 5C, 5C,... Extending outward from the center beams 5B, 5B in the left-right direction, and the overhanging beams 5C, 5C The left and right side beams 5D and 5D are joined to the front end side of the front and rear sides and extend in the front-rear direction, and a plurality of under covers 5E provided between the bottom plate 5A and the side beams 5D and 5D. Has been.

  The under cover 5E disposed on the right front side of the revolving frame 5 is provided with a hole 5Ea as shown in FIG. 5, and a cooling air introduction duct 21 described later is connected to the hole 5Ea. The connecting member 5Eb is fixed.

  The cab 6 on which the operator rides is mounted on the left front side of the revolving frame 5, and a driver's seat on which the operator is seated, an operation lever and the like (all not shown) are arranged.

  The counterweight 7 has a weight balance with the front device 4 and is formed as a heavy object having an arc shape as shown in FIGS. 1 and 2, and is attached to the rear end portion of the revolving frame 5. .

  The main motor 8 is disposed laterally in the left-right direction at the rear of the turning frame 5 and in front of the counterweight 7. On the left side of the main motor 8, a cooling fan 8A for supplying cooling air to an oil cooler 10 described later is provided.

  A hydraulic pump 9 is attached to the right side of the main motor 8. The hydraulic pump 9 is driven by the main motor 8 to supply hydraulic oil as pressure oil to the front device 4 and the like. A plurality of hydraulic hoses are connected to the hydraulic pump 9, and each hydraulic hose is connected to a hydraulic oil tank 11, a control valve device 12, and the like, which will be described later.

  The oil cooler 10 is disposed at a position facing the cooling fan 8A of the main motor 8 and cools the hydraulic oil.

  The hydraulic oil tank 11 is a rectangular parallelepiped pressure-resistant tank, and is provided on the front side of the main motor 8 and on the right side of the right center beam 5B of the revolving frame 5.

  The control valve device 12 is formed as a multiple valve formed by connecting a plurality of control valves, and is provided at the right front portion of the turning frame 5.

  The building cover 13 is provided between the cab 6 and the counterweight 7 and is provided on the revolving frame 5. As shown in FIGS. 1 and 2, the building cover 13 includes left and right side plates 13A and 13A that are located on both left and right sides of the revolving frame 5 and extend in the front-rear direction, and upper ends of the side plates 13A and 13A. The upper side plate 13B extending in the horizontal direction is generally configured. The right side plate 13A is provided with an intake slit 13C through which outside air (cooling air) flows, and the upper side plate 13B and the like are exhausted to discharge cooling air. A mouth (not shown) is provided. A front cover portion 13D that covers the control valve device is provided on the right front side of the revolving frame 5.

  Further, in the building cover 13, a partition wall 14 that is an intermediate portion in the front-rear direction and extends in the left-right direction is provided, and the motor chamber 15 is partitioned by the partition wall 14, the building cover 13, the counterweight 7, and the like.

  The control panel 16 is a rectangular parallelepiped casing and is disposed in front of the hydraulic pump 9 and adjacent to the right side of the hydraulic oil tank 11. In a normal engine-driven hydraulic excavator, a fuel tank is arranged in this space. However, in a hydraulic excavator diverted to an electric drive type as in the present embodiment, a fuel tank is not necessary, so here. A control panel 16 can be installed.

  Further, the control panel 16 receives power for driving the main motor 8 from an external power receiving device (not shown) via the power cable 101. A cable stand 102 that prevents damage due to contact of the power cable 101 with the lower traveling body 2 is provided on the upper part of the upper swing body 3 to support the power cable 101.

  Next, the control panel 16 will be described in detail with reference to FIGS. 4 is an enlarged side view of the right side of the front part of the upper swing body constituting the hydraulic excavator shown in FIG. 2, and FIG. 5 is an enlarged front view showing a control panel constituting an embodiment of the electrically driven construction machine of the present invention. It is sectional drawing. 4 and 5, the same reference numerals as those shown in FIGS. 1 to 3 denote the same parts, and detailed description thereof will be omitted.

  FIG. 4 shows a state in which the right side beam 5D of the upper swing body 3 is removed. For example, a hydraulic hose laid from the hydraulic pump 9 to the control valve device 12 at the upper portion of the under cover 5E of the swing frame 5. In addition, a state where wirings drawn into the control panel 16 are laid is also shown.

  The control panel 16 houses a control device E such as a breaker and fuse to which a power cable 101 from an external power source is connected, a starting device, a control device, and a power supply for accessory of a vehicle body.

  4 and 5, the casing 16A constituting the control panel 16 includes a rectangular bottom plate 16B, a top plate 16C, side plates 16D and 16D, a back plate 16E, a front plate 16F, and a front door 16G. . The housing 16A is fixed to the extended beams 5C and 5C by bolting via the installation base plates 17 and 17.

  Further, the bottom plate 16B is provided with a cable introduction hole (not shown) for introducing a power cable and the like, and an air introduction hole 18, and a suction filter for preventing foreign matter from entering inside the panel of the air introduction hole 18. 18A is disposed. On the other hand, a connection member 18B to which one side of a cooling air introduction duct 21 described later is connected is fixed to the outside of the air introduction hole 18. The cable introduction hole is filled with a filler or the like after the cable laying is completed.

  The top plate 16 </ b> C is provided with an air discharge hole 19, and a discharge filter member 20 is provided outside the air discharge hole 19 to prevent foreign matter from entering from the outside.

  The cooling air introduction duct 21 is a substantially straight cylindrical member and is provided between the under cover 5 </ b> E and the bottom plate 16 </ b> B of the control panel 16, and an opening on one side thereof is connected to the connection member 18 </ b> B of the control panel 16. The other opening is connected to the connection member 5Eb of the under cover 5E. The cooling air introduction duct 21 guides the outside air below the under cover 5E into the control panel 16 as cooling air. That is, the opening on the other side of the cooling air introduction duct 21 is arranged facing the outside of the upper swing body 3 so as to guide the outside air into the control panel 16.

Next, the operation of the above-described embodiment of the electrically driven construction machine of the present invention will be described.
First, the operator opens the front door 16G of the control panel 16, turns on an internal breaker, and receives power from an external power source. Thereafter, the vehicle travels into the cab 6 and operates the operation lever or the like to cause the lower traveling body 2 to travel, and the front device 4 is operated to perform, for example, excavation work of earth and sand.

  By operating the hydraulic excavator 1, the cooling fan 8 </ b> A is rotationally driven, whereby the outside air flowing from the intake slit 13 </ b> C of the building cover 13 is supplied to the oil cooler 10 as cooling air, and the cooling air that has passed through the oil cooler 10. Circulates around the main motor 8 as shown by the solid lines in FIGS.

At this time, the cooling air that has passed through the oil cooler 10 rises in temperature by the oil cooler 10, and a part thereof is discharged from an exhaust port provided in the top plate 13 </ b> B or the like, but a part thereof is a partition in the motor chamber 15. 14 flows downward and flows into the space between the bottom plate 16B and the under cover 5E. This warmed cooling air is caused by heat generated from the power cable, the hydraulic hose laid from the hydraulic pump 9 to the control valve device 12 and other devices when passing through the space between the bottom plate 16B and the under cover 5E. Further warmed. Thus, although the temperature between the lower part of the control panel 16 and the upper part of the under cover 5E rises, the control panel 16 is provided with the cooling air introduction duct 21 for introducing the outside air below the under cover 5E. Therefore, it is possible to prevent the warmed cooling air from flowing into the control panel 16.

  According to the above-described embodiment of the electrically driven construction machine of the present invention, the control panel 16 containing the inverter and other control devices is disposed on the front right side of the upper swing body 3, and the bottom plate 16B of the control panel 16 is disposed. Since the cooling air introduction duct 21 that communicates with the outside air is provided, the cooling efficiency of the control equipment housed in the control panel 16 is improved, and an electrically driven construction machine in which the reliability of these equipment is ensured can be provided. it can.

  In the present embodiment, the hole 5Ea is provided in the under cover 5E that forms the lower surface of the swivel frame 5, and the cooling air introduction duct 21 is configured to open to the outside through the hole 5Ea. The wind introduction duct 21 can be easily opened to the outside using the under cover 5E. Further, since the cool outside air outside the upper swing body 3 can be sucked in as cooling air, the cooling efficiency of the control device housed in the control panel 16 can be improved.

  Next, another embodiment of the electrically driven construction machine of the present invention will be described with reference to FIGS. FIG. 6 is an enlarged side view of the front right side of the upper swing structure in another embodiment of the electrically driven construction machine of the present invention, and FIG. 7 constitutes another embodiment of the electrically driven construction machine of the present invention. It is a side part expanded sectional view which shows a control board. 6 and 7, the same reference numerals as those shown in FIGS. 1 to 5 are the same or corresponding parts, and the description thereof is omitted.

  In the present embodiment, the hole 5Ea and the connecting member 5Eb of the under cover 5E of one embodiment are omitted, and the outer side and the inner side are penetrated to a part of the side beam 5D on the lower side of the control panel 16. A slit member 5Da is provided, and a connecting member 21B, which is located at the slit member 5Da and to which an opening on the other side of a cooling air introduction duct 21A described later is connected, is fixed inside. That is, in the present embodiment, the outside air sucked into the control panel 16 is introduced not from the lower side of the under cover 5E but from the outside of the side boom 5D.

  In FIG. 6 and FIG. 7, the cooling air introduction duct 21 </ b> A is a rectangular tube-like member formed by bending at a substantially right angle at a right angle, and the opening on one side is fixed to the bottom plate 16 </ b> B of the control panel 16. Connected to the connecting member 18B, and the opening on the other side is connected to a connecting member 21B fixed inside the side beam 5D. The cooling air introduction duct 21A guides the outside air outside the side beam 5D into the control panel 16 as cooling air.

  According to another embodiment of the electrically driven construction machine of the present invention, the same effect as that of the above-described embodiment can be obtained.

  Further, in the present embodiment, the slit portion 5Da is provided in the side beam 5D that forms the lower side surface of the swivel frame 5, and the cooling air introduction duct 21A is configured to open to the outside through the hole portion 5Da. The cooling air introduction duct 21A can be easily opened to the outside using the side beam 5D. Further, since the outside cold outside air can be sucked from the side of the upper swing body 3 as the cooling air, the cooling efficiency of the control device housed in the control panel 16 can be improved.

  In one embodiment, the cooling air introduction duct 21 is formed in a straight tube shape, and in the other embodiments, the cooling air introduction duct 21A is formed in a square tube shape. However, the shape is not limited to this, and may be a cylindrical shape, a polygonal cylindrical shape, or the like.

  Further, in the embodiment of the present invention, a hydraulic excavator has been described as an example of an electrically driven construction machine. However, the present invention is not limited to this, and may be applied to other electrically driven construction machines such as a hydraulic crane. Can also be applied.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper turning body 4 Front apparatus 5 Turning frame 5A Bottom plate 5B Center beam 5C Overhang beam 5D Side beam 5E Under cover 6 Cab 7 Counterweight 8 Main motor 9 Hydraulic pump 10 Oil cooler 11 Hydraulic oil tank 12 Control valve device 13 Building cover 14 Partition 15 Motor room 16 Control panel 17 Installation base plate 18 Cold air introduction hole 19 Air discharge hole 20 Discharge filter member 21 Cooling air introduction duct E Control device

Claims (2)

It consists of a lower traveling body and an upper revolving body mounted on the lower traveling body so as to be able to swivel. The upper revolving body extends from the bottom plate to the center of the bottom plate in the front-rear direction and is provided on the left and right centers. A beam, a plurality of projecting beams extending outward in the left-right direction from the center beam, left and right side beams extending in the front-rear direction joined to the tip side of the projecting beam, and the bottom plate and the side beam A revolving frame comprising an under cover provided on the revolving frame, a motor room provided on a rear side of the revolving frame and housing a main motor driven by receiving electric power from outside, and the main motor on the revolving frame In an electrically driven construction machine comprising a hydraulic pump provided on the side and a control panel provided in front of the hydraulic pump,
The control panel includes a housing that accommodates a control device,
The casing of the control panel is fixed on the overhanging beam of the swivel frame, and a space is formed between the bottom plate of the casing and the under cover of the swivel frame to flow cooling air in the motor chamber.
An air discharge hole is provided at the top of the housing of the control panel, an air introduction hole is provided at the bottom of the housing , one side of the cooling air introduction duct is connected to the air introduction hole, and the other side of the cooling air introduction duct electrically driven construction machine an opening, characterized in that the outside opening is allowed to air outside of the upper rotating body through a hole provided in the under cover was placed so as to guide the control panel of . It consists of a lower traveling body and an upper revolving body mounted on the lower traveling body so as to be able to swivel. The upper revolving body extends from the bottom plate to the center of the bottom plate in the front-rear direction and is provided on the left and right centers. A beam, a plurality of projecting beams extending outward in the left-right direction from the center beam, left and right side beams extending in the front-rear direction joined to the tip side of the projecting beam, and the bottom plate and the side beam A revolving frame comprising an under cover provided on the revolving frame, a motor room provided on a rear side of the revolving frame and housing a main motor driven by receiving electric power from outside, and the main motor on the revolving frame In an electrically driven construction machine comprising a hydraulic pump provided on the side and a control panel provided in front of the hydraulic pump,
The control panel includes a housing that accommodates a control device,
The casing of the control panel is fixed on the overhanging beam of the swivel frame, and a space is formed between the bottom plate of the casing and the under cover of the swivel frame to flow cooling air in the motor chamber.
An air discharge hole is provided at the top of the housing of the control panel, an air introduction hole is provided at the bottom of the housing , one side of the cooling air introduction duct is connected to the air introduction hole, and the other side of the cooling air introduction duct electric drive the openings, characterized in that the outside by opening the outside air from the side of the side beam through holes provided above the upper swing structure was placed to direct the control panel Construction machine.

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