Work machine

Abstract

To provide a work machine in a simple configuration allowing an operator to access a maintenance area safely and easily.SOLUTION: A hydraulic shovel 1 is provided with: a lower traveling body 2; a super structure 3 rotatably mounted on the lower traveling body 2; a cab 4 arranged on a front part of the upper structure 3; and a hydraulic oil tank 10 arranged at a rear side of the cab 4 on the upper structure 3, wherein a first step 21 and a second step 22 for climbing up on the upper part of the hydraulic oil tank 10 are arranged between a rear surface 4a of the cab 4 and a front surface 10 of the hydraulic oil tank 10.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a work machine having a lower traveling body, an upper rotating body, and a hydraulic oil tank, such as a hydraulic excavator, a hydraulic crane, or a civil engineering machine. [Background technology]

[0002] Conventionally, there is known a work machine in which a maintenance deck is provided on the upper part of an upper rotating body for performing maintenance on various devices provided on the upper rotating body (see, for example, Patent Document 1). In this work machine, an ascent / descent step is provided so that the user can ascend and descend from the side of the upper rotating body to the maintenance deck.

[0003] Also, a working machine is known in which a catwalk is provided on the left side of the upper rotating body and a ladder is used by an operator standing on the catwalk to climb up to the top surface of the hydraulic oil tank (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-249670 A [Patent Document 2] JP 2020-105779 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the construction machine of Patent Document 1 is a relatively small work machine, and the maintenance deck is located at the upper center of the upper rotating body, so it can be easily accessed from the lifting step, whereas in the case of a relatively large work machine such as Patent Document 2, the maintenance deck is located behind the upper center of the upper rotating body, so it cannot be directly accessed from this lifting step.

[0006] In addition, since the work machine of Patent Document 2 is a relatively large work machine, a ladder is provided so as to protrude from the left side of the hydraulic tank, but because this ladder protrudes to the left of the hydraulic tank, it may get in the way when the work machine is traveling or turning. In addition, there is a problem that the ladder is easily damaged due to stress concentration on the fixing part between the side of the hydraulic tank due to vibration during work, etc.

[0007] The present invention has been made in consideration of these points, and its purpose is to enable workers to safely and easily access a maintenance area on an upper rotating body with a simple, durable configuration, even when the maintenance area is located relatively far back. [Means for solving the problem]

[0008] In order to achieve the above object, in the present invention, an access step for ascending to the top of the hydraulic oil tank is provided at an appropriate position behind the operator's cab.

[0009] Specifically, in the first invention, A lower running body; An upper rotating body rotatably provided on the lower traveling body; A cab provided at the front of the upper rotating body; A hydraulic oil tank provided behind the operator's cab in the upper rotating body, Between the rear surface of the operator's cab and the front surface of the hydraulic oil tank, there is provided an access step for ascending to the top of the hydraulic oil tank.

[0010] According to the above configuration, since the upper part of the hydraulic tank can be accessed from the side of the upper rotating body using the ascending and descending steps, even if the maintenance deck on the upper part of the upper rotating body is located relatively far back, safe and reliable access can be obtained from the upper part of the hydraulic tank. Also, since there is no need to provide a ladder that protrudes from the side of the hydraulic tank as in Patent Document 2, there is no problem that the fixing part of the ladder between the side of the hydraulic tank and the side of the hydraulic tank is easily damaged due to stress concentration caused by vibration during work, etc.

[0011] In the second invention, in the first invention, A first handrail is provided on a front surface of the hydraulic oil tank, and extends to a position higher than the upper surface of the ascending / descending step.

[0012] According to the above configuration, it is possible to safely ascend and descend the ascending and descending steps while holding on to the first handrail.

[0013] In the third invention, in the second invention, A catwalk is formed on a side surface of the upper rotating body, the catwalk extending in the front-rear direction along the upper rotating body, The first handrail is set at a height that can be grasped by a worker standing on the catwalk.

[0014] According to the above configuration, by using the first handrail, a worker can safely and reliably get on and off the ascending and descending steps from the catwalk.

[0015] In a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, The step is composed of a plurality of steps, with the lowest step being located at a position and height that allows access from the catwalk.

[0016] According to the above configuration, by using the lowest step of the step, it is possible to safely and reliably get on and off the step from the catwalk.

[0017] In a fifth aspect of the present invention, in the second aspect of the present invention, A second handrail is provided on an upper surface of the hydraulic oil tank, The second handrail is provided at a position where it can be grasped by a worker standing on the ascending / descending step.

[0018] According to the above configuration, by holding the second handrail, the worker can safely climb from the ascending step onto the top of the hydraulic oil tank, which is located relatively high above the ground.

[0019] In the sixth aspect of the present invention, in the fifth aspect of the present invention, The front end of the second handrail is located directly above or adjacent to the first handrail.

[0020] According to the above configuration, from a standing position on the ascending step where the person holds on to the first handrail and climbs onto it, the person can hold on to the second handrail and climb onto the top of the hydraulic oil tank safely and reliably.

[0021] In the seventh invention, in the fifth or sixth invention, The first handrail and the second handrail are disposed inside a side surface of the hydraulic oil tank when viewed from above.

[0022] According to the above configuration, the first handrail and the second handrail do not protrude significantly beyond the side of the hydraulic oil tank, so they do not get in the way when the work machine is traveling or turning. Furthermore, the fixed part between the handrail and the side of the hydraulic oil tank is not easily damaged due to stress concentration caused by vibrations during work, etc.

[0023] In an eighth aspect of the present invention, in any one of the fifth to seventh aspects of the present invention, The second handrail includes a member extending in the front-rear direction that prevents a worker standing on the upper surface of the hydraulic oil tank from falling.

[0024] According to the above configuration, the top surface of the hydraulic oil tank is located relatively high above the ground, but the presence of a member extending in the front-to-rear direction of the second handrail allows the worker to climb up and down to the top of the hydraulic oil tank without feeling afraid. Effect of the Invention

[0025] As described above, according to the present invention, a simple and durable structure allows workers to access a maintenance area safely and easily. [Brief description of the drawings]

[0026] [Figure 1] 1 is a perspective view of a hydraulic excavator according to an embodiment of the present invention, with an upper attachment omitted, as viewed from above on the front side. FIG. [Diagram 2] 1 is a perspective view of a hydraulic excavator according to an embodiment of the present invention, viewed from above on the rear side. FIG. [Diagram 3] FIG. 1 is a side view showing a state in which a person enters the catwalk from the side of the hydraulic excavator. [Figure 4] FIG. 11 is a side view showing a state in which a person steps onto the step. [Diagram 5] FIG. 1 is a side view showing a state in which a person climbs onto the top surface of the hydraulic tank from the ascending step. [Figure 6] FIG. 2 is an enlarged side view showing the ascending / descending steps, the first handrail, the second handrail and their surroundings. [Figure 7] FIG. 2 is an enlarged perspective view of the ascending / descending step, the first handrail, the second handrail and their surroundings as viewed from above the front. [Figure 8] FIG. 2 is a perspective view of the ascending / descending step, the first handrail, the second handrail and their surroundings as viewed from above the rear. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0028] 1 to 3 show a relatively large hydraulic excavator 1 as a work machine according to an embodiment of the present invention, and this hydraulic excavator 1 is equipped with, for example, a crawler-type lower traveling structure 2. In this embodiment, the lower traveling structure 2 is hydraulically driven, but in some cases it may be electrically driven, or may be wheeled rather than crawler-type. Note that up, down, front, back, left and right in the description of this embodiment are as shown in FIG.

[0029] Although not shown in detail, the lower traveling body 2 has a swivel bearing in the upper center, and the upper swivel body 3 is supported rotatably (freely rotatable) via this swivel bearing.

[0030] Although not shown in detail, the upper rotating body 3 has a rotating frame 3a made of a sheet metal structure, and an attachment having a working device such as a bucket or civil engineering machine (not shown) can be mounted to an attachment mounting portion 3b formed at the front of this rotating frame 3a in a manner that allows it to be raised and lowered.

[0031] A box-shaped operator's cab 4 is provided on the left side of the attachment mounting portion 3b of the upper rotating body 3. On the other hand, a counterweight 5 is provided at the rear of the upper rotating body 3.

[0032] Various devices such as hydraulic devices and electrical devices for driving the hydraulic excavator 1 are arranged between the attachment mounting portion 3b, the operator's cab 4, and the counterweight 5.

[0033] Specifically, an engine room 6 is provided in the center of the front side of the counterweight 5, and an engine serving as a drive source is provided inside. Engine maintenance can be performed by lifting a bonnet 6a on the top surface toward the rear and opening it. An intake room 7 for taking air into the engine is provided on the left side of the engine room 6. A pump room 8 is provided on the right side of the engine room 6, and contains hydraulic equipment such as a hydraulic pump connected to the engine. A machine room 9 is provided in front of the pump room 8. Note that the arrangement of these various devices is not limited to this, and for example, the arrangement positions may be reversed.

[0034] Meanwhile, a hydraulic oil tank 10 in the shape of a rectangular parallelepiped box is provided in front of the intake chamber 7. A fuel tank 11 is provided in front of the machine room 9. In plan view, various hydraulic equipment 12 are arranged slightly rearward of the center of the upper rotating body 3 on the right side of the hydraulic oil tank 10 (rearward of the lifting step and on the back side of the hydraulic oil tank in side view), and the upper part of the hydraulic equipment 12 is covered with a top plate 13 made of, for example, a grating plate, which serves as a maintenance deck. This top plate 13 serves to provide a maintenance space where an operator can stand and perform maintenance on the equipment in the engine room 6, the equipment in the machine room 9, the various hydraulic equipment 12, etc.

[0035] There are two routes to the top plate 13, one on the cab 4 side and the other on the fuel tank 11 side. On the fuel tank 11 side route, the operator who gets off the cab 4 must pass through the front of the cab 4, climb up multiple scaffolding 14 while holding on to handrails 15 erected nearby, and reach the top plate 13 through part of the top surface of the machine room 9.

[0036] The other route is a route passing through the hydraulic oil tank 10 according to the present invention. Specifically, a catwalk 20 extending in the front-rear direction along the upper rotating body 3 is provided on the side of the rotating frame 3a of the upper rotating body 3 and above the lower running body 2. The catwalk 20 is, for example, made up of three scaffolding pieces fixed to the side of the rotating frame 3a. As shown in FIG. 3, the catwalk 20 is designed so that the operator can climb up by placing his / her feet on the footrests 2a protruding from the side of the lower running body 2. A handhold 4b is provided on the front lower side of the cab 4 so that the operator M can place his / her hands on the footrests 2a.

[0037] Between the rear surface 4a of the cab 4 and the front surface 10a of the hydraulic oil tank 10, first and second ascending steps 21, 22 for ascending to the upper part of the hydraulic oil tank 10 are provided.

[0038] As shown enlarged in Figs. 6 to 8, the first and second ascending and descending steps 21, 22 are, for example, composed of a plurality of steps (specifically, two steps), and the lowest step, the first ascending and descending step 21, is provided at a position and height that allows a person to step over from the catwalk 20. The ascending and descending steps may be composed of three or more steps. The first ascending and descending step 21 is a relatively small rectangular parallelepiped step that serves as an auxiliary step. A second ascending and descending step 22 that is higher than the first ascending and descending step 21 is provided at the back side of the first ascending and descending step 21. The upper surface of the second ascending and descending step 22 is, for example, composed of the upper surface of a rectangular parallelepiped battery box, and has a relatively large area. It is preferable that the first and second ascending and descending steps 21, 22 satisfy, for example, the "Safety Requirements Applicable to Stairs" of the JIS standard.

[0039] As shown in an enlarged view in FIG. 6, a first handrail 23 is provided on the front surface 10a of the hydraulic oil tank 10, which extends to a position higher than the upper surface of the second lift step 22, which is higher. The first handrail 23 is, for example, formed by bending a round steel bar or a round pipe, and its lower end is located between the upper surface of the first lift step 21 and the upper surface of the second lift step 22, and its upper end is located between the second lift step 22 and the upper surface 10b of the hydraulic oil tank 10. The first handrail 23 is provided directly above the first lift step 21. This first handrail 23 is set at a height that can be grasped by an operator standing on the catwalk 20. In a work machine smaller than that of this embodiment, the first handrail 23 may be set at a height that can be grasped by an operator standing on the ground.

[0040] Furthermore, a second handrail 24 is erected on the upper surface 10b of the hydraulic oil tank 10, and the second handrail 24 is provided in a position where it can be grasped by an operator standing on the first lifting step 21 and the second lifting step 22.

[0041] The second handrail 24 is formed, for example, by bending a round steel bar or a round bar into an inverted U-shape, and its front end is located slightly behind the first handrail 23 and directly above it.

[0042] The first handrail 23 and the second handrail 24 are disposed inside the side surface of the hydraulic oil tank 10 when viewed from above. In this way, the first handrail 23 and the second handrail 24 do not protrude significantly beyond the side surface of the hydraulic oil tank 10, so they do not get in the way when the hydraulic excavator 1 travels or turns, and there is no problem that the fixing portion of the ladder between the side surface of the hydraulic oil tank and the ladder is easily damaged due to stress concentration caused by vibration during work, etc.

[0043] As shown in FIGS. 6 to 8, the second handrail 24 includes a member that extends horizontally in the front-rear direction and prevents a worker standing on the upper surface 10b of the hydraulic oil tank 10 from falling.

[0044] As shown in Figs. 6 and 7, the maintenance deck provided on the upper surface of the upper rotating body 3 is provided on the rear side of the hydraulic oil tank 10 when viewed from the side.

[0045] -How to access the maintenance space- Next, a method of accessing the maintenance space of the hydraulic excavator 1 according to this embodiment will be described.

[0046] Here, the route on the side of the cab 4 will be described with reference to the drawings, instead of the route on the side of the fuel tank 11 opposite the cab 4 as described above.

[0047] First, as shown in Figure 3, worker M places his / her feet on footrests 2a protruding from the side of the lower running body 2 and places his / her hands on handrests 4b provided on the lower side of the driver's cab 4, and then moves onto the catwalk 20.

[0048] Next, the worker M moves backward on the catwalk 20, and while holding the first handrail 23, steps onto the first ascending / descending step 21, and further steps onto the second ascending / descending step 22 as shown in FIG.

[0049] In this way, by using the low-height auxiliary first step 21, it is possible to safely and reliably get on and off the second step 22 from the catwalk 20. Also, the first step 21 and the second step 22 can be safely ascended and descended while holding the first handrail 23.

[0050] Furthermore, if the work machine is smaller than that of this embodiment and does not have a catwalk 20, the first handrail 23 can be used to allow the worker M to safely and reliably get on and off the first and second lifting steps 21 and 22 from the ground.

[0051] Furthermore, the worker climbs up to the upper surface 10b of the hydraulic oil tank 10 while holding the second handrail 24. By holding the second handrail 24 in this way, the worker can get on to the upper surface 10b of the hydraulic oil tank 10, which is located at a relatively high position from the ground, from the first ascent step 21 and the second ascent step 22.

[0052] An operator can climb onto the top of the hydraulic oil tank 10 from the side of the upper rotating body 3 using the first and second lifting steps 21 and 22, so that even if the top plate 13 (maintenance deck) on the top of the upper rotating body 3 is relatively far back, an operator can safely and reliably access the hydraulic oil tank 10 from the top.

[0053] At this time, the upper surface 10b of the hydraulic oil tank 10 is located quite high from the ground, but the presence of the second handrail 24 having a horizontal member can also be used as a handrail, allowing the worker to climb up and down to the top of the hydraulic oil tank 10 without feeling fear.

[0054] Finally, the operator moves from the upper surface 10b of the hydraulic oil tank 10 onto the top plate 13, completing access to the maintenance space. Maintenance of various devices of the hydraulic excavator 1 can be performed from the top plate 13.

[0055] In this manner, in this embodiment, a person can grab the first handrail 23 and then grasp the second handrail 24 from a standing position on the first lift step 21 and the second lift step 22 to safely and securely climb onto the top of the hydraulic oil tank 10.

[0056] Furthermore, even in the case of a relatively large hydraulic excavator 1 as in this embodiment in which the top plate 13 (maintenance deck) is located rearward of the upper center of the upper rotating body 3, the top plate 13 can be accessed safely and reliably by using the first lifting step 21 and the second lifting step 22.

[0057] Therefore, the hydraulic excavator 1 according to this embodiment has a simple configuration and allows the operator to access the maintenance area safely and easily.

[0058] (Other embodiments) The present invention may be configured as follows with respect to the above embodiment.

[0059] That is, in the above embodiment, the work machine is a relatively large crawler type hydraulic excavator 1, but it may also be a crawler type hydraulic crane, hydraulic civil engineering machine, etc., or it may also be a wheel type hydraulic excavator, hydraulic crane, hydraulic civil engineering machine, etc.

[0060] It should be noted that the above-described embodiments are essentially preferred examples, and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of symbols]

[0061] 1. Hydraulic excavator 2 Undercarriage 2a Footrest 3. Upper rotating body 3a Swivel frame 3b Attachment mounting part 4. Cab 4a Rear 4b Handle 5 Counterweight 6. Engine Room 6a Bonnet 7. Intake chamber 8. Pump Room 9 Machine room 10 Hydraulic Oil Tank 10a front 10b Top side 11 Fuel Tank 12 Hydraulic Equipment 13 Tabletop 14 Scaffolding 15 Handrails 20 Catwalk 21 First step 22 2nd step 23 First Handrail 24 No. 2 Handrail

Claims

1. A lower running body; An upper rotating body rotatably provided on the lower traveling body; A cab provided at the front of the upper rotating body; A hydraulic oil tank provided behind the operator's cab in the upper rotating body, Between the rear surface of the cab and the front surface of the hydraulic oil tank, there is provided an access step for ascending to the top of the hydraulic oil tank. A working machine characterized by:

2. A first handrail is provided on the front surface of the hydraulic oil tank and extends to a position higher than the upper surface of the ascending / descending step.

2. A work machine according to claim 1.

3. A catwalk is formed on a side surface of the upper rotating body, the catwalk extending in the front-rear direction along the upper rotating body, The first handrail is set at a height that can be grasped by a worker standing on the catwalk.

3. A work machine according to claim 2.

4. The step is composed of a plurality of steps, and the lowest step is provided at a position and height that allows the user to step onto the catwalk.

4. A work machine according to claim 3.

5. A second handrail is provided on an upper surface of the hydraulic oil tank, The second handrail is provided at a position where it can be grasped by a worker standing on the lift step.

3. A work machine according to claim 2.

6. The front end of the second handrail is located directly above or adjacent to the first handrail.

6. A work machine according to claim 5.

7. The first handrail and the second handrail are disposed on the inside of a side surface of the hydraulic oil tank when viewed from above.

6. A work machine according to claim 5.

8. The second handrail includes a member extending in the front-rear direction to prevent a worker standing on the upper surface of the hydraulic oil tank from falling. A work machine according to any one of claims 5 to 7.

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