Work machine

Abstract

To provide a work machine capable of economically performing maintenance such as periodic inspection of an emergency escape device, safely even in a narrow working area, and with simple operations.SOLUTION: A work machine includes a machine body 2, a staircase device 20, and an emergency escape device 30. The staircase device 20 has a movable staircase 22 that can be changed between a state where it is folded and stored in the machine body 2 and a state where it is deployed toward the ground. The emergency escape device 30 has a movable ladder 36 that can be changed between a state where it is stored in the machine body 2 and a state where it is deployed toward the ground. The machine body 2 is provided with an interlocking mechanism 50 that changes the movable ladder 36 of the emergency escape device 30 to a state where it is stored in the machine body 2 in conjunction with the movable staircase 22 of the staircase device 20 being deployed toward the ground.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a work machine, and more particularly to a work machine equipped with an emergency escape device for enabling an operator to escape from a cab in the event of an emergency. [Background technology]

[0002] Patent Document 1 discloses a work machine with a counterweight mounted at the rear of the frame of the vehicle body. A link that is rotated by an actuator is provided at the rear of the frame of the vehicle body. When the counterweight is to be attached to or detached from the frame, a wire is stretched between the counterweight and the working device via the link. By operating the actuator with the wire stretched, the counterweight can be removed from the frame.

[0003] In detail, the actuator is a cylinder mechanism provided on the upper rotating body, the piston rod of this cylinder mechanism is rotatably supported by the link, and the wire is stretched between the boom and counterweight that constitute the working device. Then, pressure oil is supplied from a hydraulic source of the machine such as the upper rotating body to the cylinder mechanism to extend the piston rod of the cylinder mechanism. In addition, pressure oil is supplied from the hydraulic source to the boom cylinder of the boom to extend the piston rod of the boom cylinder. This makes it possible to attach and detach the counterweight to and from the frame without using another machine such as a tow truck. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 59-5669 Summary of the Invention [Problem to be solved by the invention]

[0005] In large hydraulic excavators and dump trucks used in mines and the like, the platform on which the cab for the operator is installed has a height difference of 2m or more from the ground. Therefore, such work machines are provided with an emergency escape device. The emergency escape device has an escape route for the operator to escape from the platform to the ground in the event of an emergency such as a disaster, and part of the escape route is composed of a ladder.

[0006] In an emergency, the stored ladder can be deployed toward the ground, allowing escape from the cab to the ground. Whether the ladder can be deployed and stored normally is checked periodically during maintenance, etc. Therefore, it is conceivable that after the ladder is deployed during maintenance, it can be stored again by operating the cylinder mechanism and boom cylinder described in Patent Document 1. This makes it possible to store the ladder without using other machines such as a tow truck.

[0007] However, when the technology of Patent Document 1 is applied, it is necessary to supply pressure oil from a hydraulic source to operate the boom and cylinder mechanism, so that the main power source of the aircraft must be started just for the ladder storage work, which makes the work complicated and leads to a decrease in economy in terms of fuel consumption, etc. Also, it is necessary to secure a large work area to safely operate a large boom.

[0008] In addition, because the large boom must be operated finely to store the ladder, the operator is required to have high operational skills for the work equipment. Therefore, there is a demand for a work machine that allows maintenance such as periodic inspection of the emergency escape device to be performed economically, safely even in a small work area, and with simple operations.

[0009] The present invention has been made in consideration of these problems, and has an object to provide a work machine which enables maintenance such as regular inspections of an emergency escape device to be performed economically, safely even in a narrow work area, and with simple operations. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the working machine of the present invention is a working machine comprising a body, a stair device for allowing an operator to move between the body and the ground, and an emergency escape device for allowing the operator to escape from the body to the ground, wherein the stair device has movable stairs that can be changed between a state in which it is folded and stored in the body and a state in which it is deployed toward the ground, the emergency escape device has a movable ladder that can be changed between a state in which it is stored in the body and a state in which it is deployed toward the ground, and the body is provided with an interlocking mechanism that changes the movable ladder of the emergency escape device to a state stored in the body in conjunction with the movable stairs of the stair device being deployed toward the ground. Effect of the Invention

[0011] According to the present invention, a work machine can be provided in which maintenance such as periodic inspection of an emergency escape device can be performed economically, safely even in a narrow work area, and with simple operations. [Brief description of the drawings]

[0012] [Figure 1] 1 is a schematic side view of a work machine according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an enlarged side view of the staircase device of FIG. [Diagram 3] 11 is a side view of the movable staircase during the transition from the first stored position to the first deployed position. FIG. [Figure 4] FIG. 2 is a side view of the movable staircase when it has been moved to the first deployed position. [Diagram 5] FIG. [Figure 6] FIG. 2 is a partial perspective view of the upper and lower ladders. [Figure 7] 11 is a perspective view showing the process of the lower ladder moving from the second stored position to the second deployed position. FIG. [Figure 8] FIG. 13 is a perspective view of the lower ladder when it is moved to the second deployed position. [Figure 9] FIG. 4 is a side view of the work machine after the emergency escape device has been activated. [Figure 10] FIG. 10 is a perspective view of the staircase device and the emergency escape device in FIG. 9. [Figure 11] FIG. 11 is an enlarged perspective view of the movable staircase of FIG. 10. [Figure 12] FIG. 11 is an enlarged perspective view of the lower end side of the lower ladder of FIG. 10. [Figure 13] 1 is a perspective view of the staircase device and the emergency escape device when the interlocking mechanism is activated. FIG. [Figure 14] 1 is a perspective view of the staircase device and the emergency escape device when the lower ladder is moved to the second storage position by the interlocking mechanism. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A working machine according to an embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic side view of a working machine, and shows a large hydraulic excavator used in mines and the like as an example of a working machine in a simplified manner. The body 2 of the working machine is made up of a self-propelled crawler-type lower traveling body 4 and an upper rotating body 6 that is mounted on the lower traveling body 4 so as to be able to rotate. A working device 8 for performing work such as excavating earth and sand is attached to the front of the upper rotating body 6.

[0014] The working device 8 is configured to be able to swing left and right by the rotation of the upper rotating body 6, and to be able to move up and down in the vertical direction. The upper rotating body 6 is configured to be able to rotate with respect to the lower running body 4, and a platform 10 is formed on the upper front side of the upper rotating body 6. A cab (operating room) 12 in which the operator boards is installed on the platform 10, and a passageway for the operator to walk on is also formed. In addition, the upper rotating body 6 is provided with a movable staircase device 20 for the operator to move between the machine body 2 and the ground, and a movable emergency escape device 30 for the operator to escape from the machine body 2 to the ground.

[0015] Fig. 2 shows an enlarged side view of the stair device 20 in Fig. 1, showing the stair device 20 in a stored state. Fig. 3 shows the stair device 20 in operation. Fig. 4 shows the stair device 20 in an unfolded state. In this embodiment, the stair device 20 has a movable staircase 22 that can be changed between a folded and stored state in the aircraft body 2 and a deployed state toward the ground. Fig. 3 shows a side view of the movable staircase 22 moving from the first storage position P1a to the first deployed position P1b. Fig. 4 shows a side view of the movable staircase 22 when it moves to the first deployed position P1b. The staircase device 20 forms a movement path for an operator to move between the platform 10 and the ground under normal circumstances. In this embodiment, the staircase device 20 includes, in order from the ground side, the movable staircase 22, a first intermediate step 24, and a fixed staircase 26.

[0016] The movable stairs 22 are movable stairs that can be folded and stored, and enable movement from the ground to the first intermediate step 24 when in the first deployed position P1b shown in Fig. 4. The fixed stairs 26 are fixed stairs that enable movement from the first intermediate step 24 to the platform 10. An upper end (the other end) 22a (see Figs. 3 and 4) of the storage stairs 22 is rotatably supported on the first intermediate step 24.

[0017] The lower end (one end) 22b (see Figs. 3 and 4) of the storage stairs 22 is folded toward the upper end 22a of the storage stairs 22, with the intermediate portion 22c (see Figs. 3 and 4) in the longitudinal direction of the storage stairs 22 as a fulcrum, and moves to the first storage position P1a shown in Fig. 2. Meanwhile, the lower end 22b of the storage stairs 22 moves away from the upper end 22a, with the intermediate portion 22c as a fulcrum, so that the lower end 22b is deployed toward the ground, and moves to the first deployed position P1b shown in Fig. 4 via the state shown in Fig. 3.

[0018] Here, the staircase device 20 includes an actuator 28 that moves the movable staircase 22 between the first storage position P1a and the first deployment position P1b. The actuator 28 is housed, for example, in a box arranged below the first intermediate step 24, and is operated by a power source separate from the main power source of the vehicle body 2 (for example, a prime mover such as an engine or a main motor). That is, in this embodiment, the actuator 28 is configured to operate without starting the power source of the vehicle body 2. Specifically, the actuator 28 is, for example, a motor, and is powered by a battery (for example, housed in the box) that stores power for driving auxiliary devices (for example, lights and monitors), and is operated by power supply from the battery.

[0019] Although not shown, an operation switch for operating the actuator 28 is disposed in a position accessible from the ground. An operator on the ground operates the operation switch to operate the actuator 28, thereby moving the movable staircase 22 from the first stored position P1a in Fig. 2 to the first deployed position P1b in Fig. 4 via the state in Fig. 3. This allows the operator to board the cab 12 by passing through the movable staircase 22, the first intermediate step 24, the fixed staircase 26, and the platform 10 in this order.

[0020] An operation switch for the actuator 28 is also provided on the platform 10 side. An operator on the platform 10 or the cab 12 can operate this operation switch to activate the actuator 28 and move the movable staircase 22 between the first storage position P1a and the first deployment position P1b. This allows the operator to deploy and retract the movable staircase 22 on both the ground side and the platform 10 side.

[0021] FIG. 5 shows a perspective view of the emergency escape device 30. In this embodiment, the emergency escape device 30 has a movable ladder (hereinafter referred to as a lower ladder) 36 that can be changed between a state stored in the aircraft body 2 and a state deployed toward the ground. FIG. 6 shows a partial perspective view of the upper ladder 32 and the lower ladder 36 of the emergency escape device 30. The emergency escape device 30 forms an escape route for an operator to quickly escape from the platform 10 to the ground in the event of an emergency such as a fire. In detail, the emergency escape device 30 includes, in order from the platform 10 side, an upper ladder (fixed ladder) 32, a second intermediate step 34, and a lower ladder (movable ladder) 36.

[0022] The upper ladder 32 is a fixed ladder, and extends downward from the platform 10 to the second intermediate step 34. As shown in Fig. 6, a cage 38 is disposed in a position surrounding an escape route 40 formed above and around the upper ladder 32. The cage 38 prevents an operator who loses balance due to being blown by wind, etc., from falling from the upper ladder 32. In addition, a gate 42 is provided at the entrance from the platform 10 to the escape route 40.

[0023] The entrance is opened by rotating the gate 42 toward the escape route 40. The lower ladder 36 is a foldable ladder, and in the state shown in Fig. 6, the lower end (one end) 36a of the lower ladder 36 is folded toward the platform 10 and stored, moving to the second storage position P2a. In this state, the lower end 36a of the lower ladder 36 is supported on the platform 10 by a ladder locking mechanism 44. The ladder locking mechanism 44 has a pedal 44a for releasing the lower ladder 36 from support on the platform 10.

[0024] FIG. 7 shows a perspective view of the process in which the lower ladder 36 moves from the second storage position P2a to the second deployed position P2b, and FIG. 8 shows a perspective view of the lower ladder 36 when it moves to the second deployed position P2b. As shown in FIG. 8, the upper end 36b of the lower ladder 36 is rotatably supported by the second intermediate step 34. When the operator depresses the pedal 44a of the ladder locking mechanism 44 shown in FIG. 6, the lower end 36a of the lower ladder 36 is deployed toward the ground, and the lower ladder 36 moves to the second deployed position P2b shown in FIG. 8 through the state shown in FIG. 7. This allows the operator to escape to the ground in an emergency by passing through the upper ladder 32, the second intermediate step 34, and the lower ladder 36 in this order.

[0025] Fig. 9 shows a side view of the work machine after the emergency escape device 30 has been operated, and Fig. 10 shows a perspective view of the staircase device 20 and the emergency escape device 30 in Fig. 9. During maintenance and the like, it is periodically checked whether the lower ladder 36 can be deployed and stored normally. Figs. 9 and 10 show the state after the periodic inspection. In this embodiment, after the emergency escape device 30 has been operated during the periodic inspection, the interlocking mechanism 50 is used to return the lower ladder 36, which is in the second deployed position P2b, to the second stored position P2a.

[0026] The interlocking mechanism 50 is configured to change the movable ladder 36 of the emergency escape device 30 to a stored state in the machine body 2 in conjunction with the deployment of the movable stairs 22 of the stair device 20 toward the ground. More specifically, in this embodiment, the interlocking mechanism 50 is composed of a ring-shaped suspension ring 52 fixed to the cab 12 and a wire 54 passed through the suspension ring 52.

[0027] Fig. 11 shows an enlarged perspective view of the movable staircase 22 in Fig. 10, and Fig. 12 shows an enlarged perspective view of the lower end 36a side of the lower ladder 36 in Fig. 10. As shown in Fig. 11, one end of the wire 54 passed through the hanging ring 52 is connected to a step (first connection part) 22d of the movable staircase 22 disposed near the middle part 22c of the movable staircase 22. Also, as shown in Fig. 12, the other end of the wire 54 passed through the hanging ring 52 is connected to a ring-shaped connection part (second connection part) 36c disposed on the lower end 36a side of the lower ladder 36.

[0028] Fig. 13 shows a perspective view of the stair unit 20 and the emergency escape device 30 when the interlocking mechanism 50 is operated, and Fig. 14 shows a perspective view of the stair unit 20 and the emergency escape device 30 when the interlocking mechanism 50 moves the lower ladder 36 to the second storage position P2a. With the wire 54 set, the operator operates the above-mentioned operation switch to operate the actuator 28. This causes the movable stair 22 to move from the first storage position P1a shown in Fig. 10 to the first deployment position P1b shown in Fig. 14 via the state shown in Fig. 13.

[0029] In conjunction with this series of movements of the movable stairs 22, the interlocking mechanism 50 moves the lower ladder 36, via the wire 54 passed through the hanging ring 52, from the second deployed position P2b shown in Fig. 10 to the second stored position P2a shown in Fig. 14, via the state in Fig. 13. More specifically, the actuator 28 is operated to move the movable stairs 22 from the first stored position P1a to the first deployed position P1b, causing the step 22d to which one end of the wire 54 is connected to move downward, and the wire 54 passing through the hanging ring 52 is pulled.

[0030] At the same time, the connection portion 36c of the lower ladder 36 to which the other end of the wire 54 is connected moves upward toward the platform 10. As a result, the lower ladder 36 moves from the second deployed position P2b shown in Fig. 10 to the second stored position P2a shown in Fig. 14, and the emergency escape device 30 is restored to the state before activation. After the lower ladder 36 moves to the second stored position P2a, the lower end 36a of the lower ladder 36 is supported on the platform 10 by the ladder locking mechanism 44.

[0031] As described above, the working machine of this embodiment includes the above-mentioned stair device 20, emergency escape device 30, and interlocking mechanism 50, and the interlocking mechanism 50 operates the actuator 28 of the stair device 20 to interlock with the movable stair 22 moving from the first storage position P1a to the first deployed position P1b, thereby moving the lower ladder 36 from the second deployed position P2b to the second stored position P2a. At this time, the actuator 28 operates without starting the main power source of the machine body 2.

[0032] As a result, there is no need to start the main power source of the aircraft 2 for the stowing work of the lower ladder 36, improving the workability and economy of the maintenance of the emergency escape device 30. In addition, since the working device 8 does not operate during the stowing work of the lower ladder 36, there is no need to secure a large work area, and maintenance can be performed safely even in a small work area. In addition, since there is no need to operate the working device 8 slightly during the stowing work of the lower ladder 36, the operator is not required to have advanced operating skills. Therefore, maintenance such as periodic inspection of the emergency escape device 30 can be performed economically, safely, and simply even in a small work area.

[0033] The interlocking mechanism 50 is composed of simple members including a hanging ring 52 fixed to the cab 12 and a wire 54 passed through the hanging ring 52, one end of which is connected to the step 22d of the movable staircase 22 and the other end of which is connected to the connection part 36c of the lower ladder 36. By operating the actuator 28 to move the movable staircase 22 from the first stored position P1a to the first deployed position P1b, the step 22d moves downward and tension is applied to the wire 54 passing through the hanging ring 52.

[0034] As tension is applied to the wire 54, the connection portion 36c of the lower ladder 36 moves upward toward the platform 10, and the lower ladder 36 moves from the second deployed position P2b to the second stored position P2a. This allows the storage operation of the lower ladder 36 and the recovery operation of the emergency escape device 30 to be performed with a simple operation without using other machinery such as a tow truck, and even without starting the main power source of the vehicle 2 or the work device 8.

[0035] Although the description of one embodiment of the present invention has been completed above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, as long as the interlocking mechanism 50 can operate the actuator 28 to move the movable staircase 22 from the first storage position P1a to the first deployment position P1b, and in conjunction with this, the lower ladder 36 can move from the second deployment position P2b to the second storage position P2a, the staircase device 20 and the emergency escape device 30 are not strictly limited to the above-mentioned form.

[0036] For example, the staircase device 20 may be configured to be operated by the main power source of the vehicle body 2. In other words, the vehicle body 2 may be provided with an interlocking mechanism 50 that changes the movable ladder 36 of the emergency escape device 30 to a stored state in the vehicle body 2 in conjunction with the deployment of the movable staircase 22 of the staircase device 20 toward the ground.

[0037] Furthermore, the suspending ring 52 may be fixed to any location, not limited to the cab 12, at least above the lower ladder 36 located at the second storage position P2a in the machine body 2. This allows the lower ladder 36 to be moved from the second deployed position P2b to the second storage position P2a by being pulled by the wire 54. Furthermore, the present invention is applicable not only to the hydraulic excavator described above, but also to various other work machines such as rope excavators, draglines, dump trucks, wheel loaders, etc. used in mines, so long as the work machine is a large one with a large difference in elevation from the platform 10 to the ground. [Explanation of symbols]

[0038] 2. Aircraft 20 Stair device 22 Movable stairs 28 Actuator 30 Emergency escape device 36 Lower ladder (movable ladder) 50 Interlocking mechanism 52 Hanging ring 54 Wire

Claims

1. A work machine including a body, a staircase device for an operator to move between the body and a ground, and an emergency escape device for the operator to escape from the body to the ground, The staircase device has a movable staircase that can be changed between a folded and stored state in the aircraft body and a deployed state toward the ground, The emergency escape device has a movable ladder that can be changed between a state stored in the aircraft body and a state deployed toward the ground, A work machine characterized in that the aircraft body is provided with a linkage mechanism that changes the movable ladder of the emergency escape device to a state stored in the aircraft body in conjunction with the movable stairs of the stair device being deployed toward the ground.

2. The interlocking mechanism includes: A suspension ring fixed to a position above the movable ladder in a stored state on the aircraft; A wire is passed through the hanging ring, one end of which is connected to the vicinity of the folding portion of the movable staircase and the other end of which is connected to the movable ladder; 2. The work machine according to claim 1, further comprising:

3. 2. The working device according to claim 1, wherein the staircase device is operated by a power source separate from a prime mover that is a power source of the machine body, and has an actuator that operates the movable staircase.

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