JP6451707B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine provided with a display device in a cab, and more particularly to the configuration of an emergency stop button.

  Conventionally, construction machines having an emergency stop button for emergency stop of an engine, a turning device, and the like are known. For example, as in the construction machine of Patent Document 1, a right console provided with a right operation lever for operating a boom cylinder and a bucket cylinder is provided on the right side of the driver's seat, and a turning motor and a left side of the driver's seat are provided. A left console having a left operation lever for operating the arm cylinder is provided. A support member for fixing the left console to the left side of the driver's seat is interposed between the left console and the floor plate of the cab, and a stop switch is provided on the front surface of the support member, that is, on the lower left side of the driver's seat. A device is provided.

JP 2012-132242 A

  However, the stop switch device as in the above-mentioned Patent Document 1 is not provided at a position that is not usually visible from the driver's seat, that is, in the lower left of the cab, and is not easily accessible, so that it is easy to operate. There is a risk in avoiding emergency hazards.

  Moreover, since it is provided in the lower left of the cab, there is a risk of erroneous operation by pressing it with a foot when sitting in the driver's seat.

  On the other hand, there is a problem if the emergency stop switch is placed at a position where the appearance is deteriorated, an extra space is required for installation, or the visibility of the operator is deteriorated.

  The present invention has been made in view of the above points, and the object of the present invention is to provide an emergency stop switch that can be readily reached in an emergency without impairing the functions of components originally provided in the cab. Is to prevent accidental operation.

  In order to achieve the above object, in the present invention, an emergency stop button is provided between the display device in the driver's cab and either the left or right window.

Specifically, the first invention presupposes a construction machine including a driven body, a driving device for driving the driven body, a cab, and a display device provided in the cab. age,
The construction machine is
A display device fixing bracket for fixing the display device in the vicinity of the window on the left or right side of the driver's seat in the cab;
A switch box mounted near the display device fixing bracket or the display device fixing bracket, and disposed between the display device and the window;
And an emergency stop button provided in the switch box for emergency stop of the driving device.

  According to the above configuration, the switch box provided with the emergency stop button is fixed between the display device and the window on the left or right side of the driver's seat in the driver's cab, so that dead space can be used. It does not easily disturb the operator's field of view and does not adversely affect the operability and appearance of other parts. Further, since the switch box is provided on the display device fixing bracket to which the display device is attached, the number of parts is reduced, the attachment strength is easily secured, and the attachment is easy. On the other hand, since it is not provided at a position where it is accidentally pushed, such as a foot or a hand, it is difficult to perform an erroneous operation. The switch box may be attached to the display device fixing bracket, or may be attached to the vicinity of the display device fixing bracket, for example, the display device itself. In addition, “near the window” means an area close to the window and includes a case where the window is in contact with the window.

In the second invention, in the first invention,
The driven body is an upper swing body,
The drive device is a turning electric motor,
The emergency stop button is a switch for operating a mechanical brake for stopping the driving of the turning electric motor.

  According to said structure, even if it is a case where a turning electric motor cannot stop when it wants to stop by the malfunction of an electric system, if an emergency stop button is pushed, it can be stopped reliably by a mechanical brake.

In the third invention, in the first or second invention,
The display device is box-shaped, and has an operation unit on at least a part of the front surface in front of the driver seat ,
A front surface of the switch box in front of the driver's seat is substantially parallel to the operation surface of the operation unit.

  According to the above configuration, since the front surface of the switch box is provided substantially in parallel with the operation surface that the operator often observes and operates, a sense of unity with the display device can be obtained and the switch box can be easily viewed. Furthermore, “substantially parallel” does not mean that the front surface of the switch box and the operation surface of the operation unit are completely parallel, but may mean that the angles may be slightly shifted from each other.

In a fourth invention, in any one of the first to third inventions,
A chamfer that is inclined to the back side is formed in the lower part of the front face in front of the switch seat of the switch box,
The emergency stop button is provided on the upper surface of the switch box.

  According to said structure, since the chamfering which inclines to the back side was provided in the front lower part of the switch box, it is easy to put a plastic bottle etc. in and out of the drink holder which puts a plastic bottle etc. below. In addition, since the emergency stop button is provided on the top surface of the switch box near the display device that is easy to enter the field of view, it is easy to operate and easy to push. I'm sorry.

In a fifth invention, in any one of the first to fourth inventions,
The switch box is detachably attached via a switch box fixing portion configured to be detachable from the display device fixing bracket.

  According to the above configuration, it is easy to secure the mounting strength of the switch box, and maintenance is extremely easy.

  As described above, according to the present invention, the emergency stop button for emergency stop of the drive device is provided in the switch box arranged between the display device and the window portion, so that it is originally provided in the cab. Without impairing the function of the parts, it is possible to prevent accidental operation by accidentally hitting in an emergency.

It is a perspective view which expands and shows the emergency stop button in the cab of the hydraulic shovel which concerns on embodiment of this invention, and its periphery. It is a side view showing the whole hydraulic excavator. It is a block diagram of a hydraulic excavator. It is the perspective view seen from the right rear of a driver's cab. It is the side view which looked at the inside of the driver's cab from the left. It is a front view which shows the driver's cab seen from the driver's seat. It is a side view which expands and shows a display and its periphery. It is a perspective view which shows the positional relationship of a switch box and a display. It is a flowchart for demonstrating the action | operation of an emergency stop button.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 2 and 3, a hybrid excavator 1 as a construction machine according to an embodiment of the present invention is a lower traveling body 2 and a driven body provided on the lower traveling body 2 so as to be able to turn. The upper swing body 3, the work attachment 4 provided so as to be able to be raised and lowered with respect to the upper swing body 3, and the drive control device 5 that controls the drive of the hybrid excavator 1.

  The lower traveling body 2 includes a pair of left and right crawlers 2a, a left traveling motor 2b and a right traveling motor 2c that supply power for traveling to the crawler 2a, a lower frame 2d provided between the respective crawlers 2a, and a lower frame. A turning electric motor 2e (shown only in FIG. 3) is provided as a drive device that is provided in 2d and drives the upper turning body 3 to turn. The swing motor 2e can drive the upper swing body 3 according to the supply of electric power, and can supply the upper swing body 3 with a power generation braking force accompanying power generation. The upper swing body 3 includes a swing frame 3a attached to the lower frame 2d so as to be swingable about an axis perpendicular to the ground.

  The work attachment 4 includes, for example, a boom 6 having a base end portion attached to the front side of the swivel frame 3a so as to be raised and lowered, and an arm 7 having a base end portion attached to the tip end portion of the boom 6 so as to be swingable. And a bucket 8 attached to the tip of the arm 7 so as to be swingable. The work attachment 4 also has a boom cylinder 9 that raises and lowers the boom 6 relative to the revolving frame 3 a, an arm cylinder 10 that swings the arm 7 relative to the boom 6, and a bucket 8 that swings relative to the arm 7. A bucket cylinder 11 is provided. The configuration of the work attachment 4 is not limited to this, and a crushing device, a magnet, or the like may be provided at the tip instead of the bucket 8.

  A cab 30 is fixed to the front side of the upper swing body 3. In some cases, the cab 30 may be provided so as to be movable up and down with respect to the upper swing body 3. As shown in FIGS. 1 and 4, a display 31 as a display device is provided inside the cab 30. The display 31 displays, for example, a water temperature gauge, a fuel gauge, and the like for confirming the state of the hybrid excavator 1, and can control the work mode, the air conditioner, the rear monitor, and the like collectively. The display 31 is a rectangular parallelepiped box shape that is long in the vertical direction, and an operation unit 31a is provided on the lower side thereof. The display device may not be such a display 31 but may be a simple monitor or the like without the operation unit 31a.

  As shown by a two-dot chain line in FIG. 8, the hybrid excavator 1 is for fixing a display device as a display device fixing bracket that fixes the display device 31 in the vicinity of the window portion 32 a on the right side of the driver's seat 32 in the cab 30. A bracket 33 is provided. The indicator fixing bracket 33 includes, for example, a fixing portion 33a extending vertically, and the fixing portion 33a is attached to the interior lower right part 40 of the cab 30 with bolts or the like. A switch box fixing portion 36 for fixing the switch box 34 is detachably attached to the indicator fixing bracket 33 by a fastening bolt 36a. A switch box 34 is attached to the switch box fixing portion 36. As shown in FIG. 6, the switch box 34 is disposed between the display 31 and the right window 32a. As shown in FIG. 8, the switch box 34 is detachably attached via a switch box fixing part 36 configured to be detachable from the display fixing bracket 33. As shown in FIG. 4, a vibration-proof rubber 37 made of rubber, for example, is attached to the right side surface of the switch box 34, so that vibration or the like may occur even if it contacts the window portion 32a. Does not occur. The front surface 34a of the switch box 34 is substantially parallel to the operation surface of the operation unit 31a and has an angle that is easy for the operator to see. A chamfer 34b is formed in the lower part of the front surface 34a so as to be inclined downward. As shown in FIGS. 1 and 7, a drink holder 38 for placing a plastic bottle or the like is provided below the chamfered portion 34b. For example, a label 34c indicating the location of the emergency stop button 35 is affixed to the front surface 34a that is easily visible by an operator. On the other hand, as shown in FIG. 6, the indicator 31 is located on the right side of the crawler operation lever 41 as viewed from the operator, and the switch box 34 is provided on the right side of the indicator 31 on the right side. The influence on the visual field of time is extremely small.

  An emergency stop button 35 is provided on the upper surface of the switch box 34 so that it can be pressed when the operator's right hand is lowered. The emergency stop button 35 is a switch for operating the mechanical brake 23 that stops the driving of the turning electric motor 2e.

  As shown in FIG. 3, the drive control device 5 includes an engine 12, a hydraulic pump 14 driven by the engine 12, and supply of hydraulic oil from the hydraulic pump 14 to the travel motors 2 b and 2 c and the cylinders 9 to 11. A control valve 15 for controlling exhaust, a speed reduction mechanism 16 connected to the output shaft of the engine 12, a generator 17 connected to the speed reduction mechanism 16, a controller 18 electrically connected to the power generator 17, A power battery 19 and an inverter 20 electrically connected to the controller 18, a turning speed reduction mechanism 21 connected to the output shaft 2f of the turning electric motor 2e, and a mechanical mechanism for the output shaft 2f of the turning electric motor 2e. A mechanical brake 23 capable of supplying a braking force, a brake release valve 24 for releasing the mechanical brake 23, and a mechanical brake via the brake release valve 24 23, a sub pump 25 that supplies hydraulic oil to the controller 23, a controller 27 that outputs a command to the brake release valve 24 and the inverter 20, and a swing operation lever 28 that outputs a drive command of the swing motor 2 e to the controller 27. ing. The emergency stop button 35 sends an electrical signal to the brake release valve 24 via the controller 27, for example.

  The control valve 15 is configured to control the traveling and operation of the work attachment 4 by controlling the supply and discharge of hydraulic oil from the hydraulic pump 14 to the traveling motors 2 b and 2 c and the cylinders 9 to 11. . The generator 17 generates power using the power of the engine 12 input via the speed reduction mechanism 16 and receives power supply from the power battery 19 to assist the drive of the engine 12. Yes. The controller 18 is provided between the generator 17 and the power battery 19 and is configured to control the operation of the generator 17. The inverter 20 is provided between the turning electric motor 2e and the power battery 19, and is configured to control the operation of the turning electric motor 2e in accordance with a command from the controller 27. The turning deceleration mechanism 21 plays a role of transmitting the turning driving force by the turning electric motor 2e to the upper turning body 3 while decelerating.

  Although not shown in detail, the mechanical brake 23 is a negative brake capable of supplying a mechanical brake force to the output shaft 2f of the turning electric motor 2e. Specifically, the mechanical brake 23 supplies a mechanical brake force to the turning electric motor 2e in a state where no release command is input from the controller 27. On the other hand, the mechanical brake 23 stops the supply of the mechanical brake force when the release command is input. The release command input to the mechanical brake 23 is performed by hydraulic oil supplied from the sub pump 25.

  The brake release valve 24 is configured to control the supply and discharge of hydraulic oil from the sub pump 25 to the mechanical brake 23. Specifically, the brake release valve 24 can be switched between a switching position A for guiding hydraulic oil in the mechanical brake 23 to the tank T and a switching position B for guiding hydraulic oil from the sub pump 25 to the mechanical brake 23. ing. The brake release valve 24 is normally urged to the switching position A, while being switched to the switching position B when a release command from the controller 27 is input to the solenoid. That is, the release command for the mechanical brake 23 includes an electrical signal output from the controller 27 and a hydraulic pressure signal input to the mechanical brake 23.

  The emergency stop button 35 described above detects whether or not the emergency stop button 35 is in an abnormal state in which the supply of the mechanical brake force to the turning electric motor 2e is forcibly maintained even when the release command is output from the controller 27. Specifically, the emergency stop button 35 permits the transmission of a release signal (electric signal) from the controller 27 to the mechanical brake 23 (the state shown in FIG. 3) and prevents the transmission of the release signal (see FIG. 3). A switch that can be switched between a state in which the contact is cut off). When the operator feels any abnormality in the operation of the hybrid excavator 1, the operator can mechanically lock the swing motor 2 e with the mechanical brake 23 by operating the emergency stop button 35. Specifically, since the emergency stop button 35 is connected to the controller 27 through a route different from that of the inverter 20, even when an abnormality occurs in the inverter 20, the emergency stop button 35 is switched to a state in which the transmission of the release command is blocked. It is possible to operate. Therefore, the operator can mechanically lock the swing motor 2e by switching the emergency stop button 35 when the swing motor 2e becomes uncontrollable, for example. Further, the emergency stop button 35 detects that the switch contact has been disconnected and outputs an electrical signal to that effect to the controller 27.

  The controller 27 has a function of outputting a release command to the mechanical brake 23 during the drive period of the swing motor 2e, and stopping the output of the release command to the mechanical brake 23 when the swing motor 2e is in a stopped state. Specifically, when a drive command for the swing motor 2e is input from the swing operation lever 28, the controller 27 outputs a command to the inverter 20 that power should be supplied from the power battery 19 to the swing motor 2e. Then, a release command for switching the brake release valve 24 to the switching position B is output to the solenoid of the brake release valve 24. On the other hand, the controller 27 stops the output of the release command to the brake release valve 24 when the turning electric motor 2e is in a stopped state. The stopped state of the swing motor 2e includes not only the case where the drive speed of the swing motor 2e is 0, but also the case where the swing motor 2e is driven at a low speed that can be regarded as stopped. .

  Hereinafter, processing executed by the controller 27 will be described with reference to FIG. When the process is started, first, in step S1, it is determined whether or not the turning operation lever 28 has been operated. If it is determined that the turning operation lever 28 has been operated, the mechanical brake 23 is released in step S2, and the turning electric motor 2e is driven in step S3. That is, when the turning operation lever 28 is operated, the mechanical brake force for the turning electric motor 2e is released, and the electric power charged in the power battery 19 or the electric power generated by the generator 17 is supplied to the turning electric motor 2e.

  Next, in step S4, it is determined whether or not the emergency stop button 35 has been turned ON. That is, it is determined whether or not the switch of the emergency stop button 35 is operated in a state where the transmission of the release command from the controller 27 to the mechanical brake 23 is blocked. In the present embodiment, the emergency stop button 35 is provided on the upper surface of the switch box 34 in the vicinity of the display device 31 that is easy to enter the field of view, so that it is easy to operate and easy to push.

  Further, in the present embodiment, the step is performed not only in a state where the turning operation lever 28 is operated (a state via steps S1 to S3) but also in a state where the turning operation lever 28 is not operated (NO in step S1). S4 is executed. Step S4 is executed in a state where the turning operation lever 28 is not operated, even when the turning operation lever 28 is not operated, the turning electric motor 2e is driven as in the braking period of the turning electric motor 2e. This is because the situation exists.

  If it is determined in step S4 that the emergency stop button 35 is ON, the mechanical brake 23 is activated via the controller 27, and the turning electric motor 2e is forcibly stopped. Thereby, the process ends.

  Thus, in this embodiment, even if the turning electric motor 2e cannot be stopped when it is desired to stop due to a malfunction of the electric system, it can be surely stopped by pressing the emergency stop button 35.

  In the present embodiment, the switch box 34 provided with the emergency stop button 35 on the upper surface is fixed between the display 31 and the window 32a on the right side of the driver's seat 32 in the cab 30, so that dead space is eliminated. In addition to being usable, it is unlikely to interfere with the operator's field of view, and adversely affects the operability and appearance of other components. Further, since the switch box 34 is provided on the display fixing bracket 33 to which the display 31 is attached, the number of parts is reduced, the mounting strength is easily secured, and the mounting is easy. On the other hand, since the switch box 34 is provided on the opposite side of the door side where the operator gets on and off instead of providing it at a position where it is pushed by mistake, such as a foot or a hand, it is difficult to perform an erroneous operation.

  In this embodiment, since the front surface of the switch box 34 is provided substantially parallel to the operation surface that the operator often observes and operates, the switch box 34 is easily visible, and the chamfered surface is inclined to the back side below the front surface. Since the bottle is provided, it is easy to put and remove the PET bottle and the like in the drink holder 38 for putting the PET bottle and the like below. Furthermore, since the emergency stop button 35 is provided on the upper surface of the switch box 34, the emergency stop button 35 is not accidentally pressed when a plastic bottle or the like is taken in or out.

  In the present embodiment, since the switch box 34 is detachably attached via the switch box fixing portion 36, the attachment strength of the switch box 34 can be easily secured and the maintenance is extremely easy.

  As described above, according to the present embodiment, the emergency stop button 35 for emergency stopping the turning electric motor 2e is provided on the upper surface of the switch box 34 disposed between the display 31 and the window 32a. In addition to not obstructing the operator's field of view and not obstructing the work, the functions of the parts originally provided in the operator cab 30 are not impaired, and a hand can reach immediately in an emergency so as not to malfunction. be able to.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the said embodiment, although the example of the hybrid shovel 1 was shown as a construction machine, it is not limited to this, For example, the crane provided with the turning electric motor or a civil engineering machine may be sufficient.

  In the above embodiment, the driven body is the upper swing body and the drive device is the swing motor 2e. However, the invention is not limited to this. For example, the left and right traveling motors 2b and 2c are the drive devices and the crawler 2a is driven. In the case of a crane, an electric motor that drives a hoisting winch as a driven body may be used as the driving device.

  In the above embodiment, the display 31 and the switch box 34 are fixed to the display fixing bracket 33 in the vicinity of the window 32a on the right side of the driver's seat in the cab. You may fix to the indicator fixing bracket 33 in the vicinity of the part 32a. Further, the switch box 34 may be fixed to the vicinity of the display 31 by another means, for example, directly to the side or bottom of the display 31 instead of being fixed to the display fixing bracket 33.

  In the above embodiment, the emergency stop button 35 is provided on the upper surface of the switch box 34, but may be provided on the lower surface. In short, it may be a position where it is too easy to be pushed and erroneously operated like the front.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

1 Hybrid excavator (construction machine)
2 Lower traveling body
2a crawler
2b Left travel motor
2c Right travel motor
2d lower frame
2e Swing motor (drive device)
2f Output shaft
3 Upper swing body (driven body)
3a Swivel frame
4 Work attachment
5 Drive control device
6 Boom
7 Arm
8 buckets
9 Boom cylinder
10 Arm cylinder
11 Bucket cylinder
12 engine
14 Hydraulic pump
15 Control valve
16 Reduction mechanism
17 Generator
18 Controller
19 Power battery
20 Inverter
21 Deceleration mechanism for turning
23 Mechanical brake
24 Brake release valve
25 Subpump
27 Controller
28 Turning control lever
30 cab
31 Display (display device)
31a Operation unit
32 Driver's seat
32a Window
33 Display Fixing Bracket (Display Fixing Bracket)
33a fixed part
34 Switch box
34a front
34b Chamfer
34c label
35 Emergency stop button
36 Switch box fixing part
36a Fastening bolt
37 Anti-vibration rubber
38 Drink holder
40 interior items
41 Crawler control lever

Claims (5)

In a construction machine including a driven body, a driving device that drives the driven body, a cab, and a display device provided inside the cab,
A display device fixing bracket for fixing the display device in the vicinity of the window on the left or right side of the driver's seat in the cab;
A switch box mounted near the display device fixing bracket or the display device fixing bracket, and disposed between the display device and the window;
A construction machine, comprising: an emergency stop button provided in the switch box for emergency stop of the drive device. The construction machine according to claim 1,
The driven body is an upper swing body,
The drive device is a turning electric motor,
The construction machine according to claim 1, wherein the emergency stop button is a switch for operating a mechanical brake for stopping driving of the turning electric motor. In the construction machine according to claim 1 or 2,
The display device is box-shaped, and has an operation unit on at least a part of the front surface in front of the driver seat ,
A construction machine , wherein a front surface of the switch box as viewed from the driver's seat is substantially parallel to an operation surface of the operation unit. The construction machine according to any one of claims 1 to 3,
A chamfer that is inclined to the back side is formed in the lower part of the front face in front of the switch seat of the switch box,
The construction machine according to claim 1, wherein the emergency stop button is provided on an upper surface of the switch box. The construction machine according to any one of claims 1 to 4,
The construction machine, wherein the switch box is detachably attached to the display device fixing bracket via a switch box fixing portion configured to be detachable.