JP6704871B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine such as a hydraulic excavator having a handrail that can be gripped by a worker when performing maintenance work on a prime mover or the like.

Generally, a hydraulic excavator, which is a typical example of a construction machine, has a self-propelled undercarriage, an upper revolving structure rotatably mounted on the lower revolving structure, and a lowering body that can be lifted and lowered in front of the upper revolving structure. It is composed of a front device provided.

The upper swing body forms a support structure, and is mounted on a swing frame to which the foot portion of the front device is attached at the front and left intermediate portions of the support structure, and a rear portion of the swing frame. A prime mover, a front side of the prime mover, and a left side of the front device sandwiching the foot portion of the front device, the front side portion, the rear surface portion, the left side surface portion, the right side surface portion, and the top surface portion. And a building cover that includes a left side plate, a right side plate, and a top plate that is located above the side plates and covers the mounted equipment including the prime mover. A handrail that can be gripped by an operator when riding in the cab is provided on the front end side of the left side surface of the cab (see, for example, Patent Document 1).

In addition to the handrail described in Patent Document 1, there is also a hydraulic excavator in which a handrail for ensuring stability and workability when performing maintenance work on a prime mover or the like is provided on the upper swing body. Are known.

JP, 2004-218277, A

By the way, it is preferable that the handrail provided on the upper swing body described above is installed so as to surround the outer peripheral end of the upper swing body. However, since various members such as an engine cover are arranged on the upper revolving structure, it may be difficult in layout to install the handrail so as to surround the outer peripheral end of the upper revolving structure. .. When performing maintenance work or the like near a place where the handrail is difficult to install, the posture of the worker may be unstable.

The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to provide a construction machine with improved posture stability and workability of an operator who performs maintenance work of mounted equipment on a revolving structure. To provide.

In order to solve the above-mentioned problems, the present invention comprises a revolving structure mounted on a base body so as to be revolvable, and a front device provided on the revolving structure so as to be able to lift and lower, and the revolving structure is a support structure. In the front side of the support structure, a swing frame to which the foot portion of the front device is attached at an intermediate portion in the left and right directions on the front side of the support structure, a prime mover mounted on the rear portion of the swing frame, and a front side of the prime mover, In addition, the front device is arranged so as to be biased to the left or right with the foot portion interposed therebetween, and is formed by a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion, and a top surface portion, and a driver's seat is provided inside. A cab, a left side plate, a right side plate, and an upper plate located above the respective side plates to cover mounted equipment including the prime mover, and the upper face plate covers an upper part of the prime mover. In a construction machine having a building cover provided with a cover, a handrail is provided on the rear surface portion of the cab, the handrail extending from a center side in the left and right directions of the building cover toward a side surface side. Is an upper horizontal gripping portion that is located on the center side of the building cover and that is formed parallel to the upper surface plate of the building cover, and that is located on the side surface side of the building cover with respect to the upper horizontal gripping portion An inclined grip portion that gradually lowers from the horizontal grip portion toward the side surface side of the building cover, and is located on the side surface side of the building cover from the other end side of the inclined grip portion toward the side surface side of the building cover. Again having a lower horizontal gripping portion that is parallel to the top plate of the building cover, the upper horizontal gripping portion of the handrail is disposed at the same height position as the top surface portion of the cab, One end side of the upper horizontal grip portion is fixed to a central end portion of the building cover of the top surface portion, and the lower horizontal grip portion extends upward from the other end side of the lower horizontal grip portion. It is characterized in that it has a rising rising portion, and an upper end side of the rising portion is fixed to an end portion on a side surface side of a building cover of the top surface portion of the cab .

According to the present invention, it is possible to improve the stability and workability of the posture of an operator who performs maintenance work of mounted equipment on a revolving structure.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. It is a top view which expands and shows the hydraulic excavator which abbreviate|omitted a part of front device. FIG. 3 is a plan view showing a state in which an engine, a heat exchange device, etc. are mounted on a revolving frame. It is the rear view which looked at the hydraulic shovel from the counterweight side in the state which abbreviate|omitted the front apparatus in FIG. It is the perspective view which looked at the hydraulic excavator in FIG. 4 from the upper left direction. It is an expansion perspective view which expands and shows the cab in FIG. 5, a cab rear handrail, etc. FIG. 5 is an enlarged rear view showing an enlarged view of a cab, a cab rear handrail and the like in a state in which an engine cover, a precleaner and the like in FIG. 4 are omitted. FIG. 7 is a perspective view similar to FIG. 6, showing a state in which an operator is performing maintenance work on the precleaner. FIG. 7 is a perspective view similar to FIG. 6, showing a cab rear handrail according to a modified example of the present invention.

Hereinafter, as a typical example of the construction machine according to the embodiment of the present invention, a wheel type hydraulic excavator will be described as an example and will be described in detail with reference to FIGS. 1 to 9.

In FIG. 1, a hydraulic excavator 1 is a wheel-type hydraulic excavator including a self-propellable wheel-type lower traveling body 2 having left and right front wheels 2A and left and right rear wheels 2B. The hydraulic excavator 1 is composed of an upper revolving structure 3 which is mounted on the lower traveling structure 2 so as to be revolvable, and a front device 4 which is provided on the upper revolving structure 3 so as to be able to move up and down. In this case, the lower traveling body 2 constitutes the base body of the present invention, and the upper revolving superstructure 3 constitutes the revolving superstructure of the present invention.

The front device 4 includes a boom 4A, an arm 4B, a bucket 4C, a boom cylinder 4D, an arm cylinder 4E, a bucket cylinder 4F, and the like. As shown in FIG. 2, the foot portion 4A1 of the boom 4A is rotatably attached to an intermediate portion in the left and right directions on the front side of a turning frame 5 described later.

The revolving frame 5 constitutes a support structure of the upper revolving superstructure 3, the foot portion 4A1 of the front device 4 is attached to the front side, and the revolving frame 5 is rotatably mounted on the lower traveling body 2. As shown in FIG. 3, the revolving frame 5 includes a bottom plate 5A made of a thick steel plate that extends in the front and rear directions, and is erected on the bottom plate 5A and has front and rear portions at predetermined intervals in the left and right directions. A left vertical plate 5B and a right vertical plate 5C extending in a direction, and a left side frame 5D and a right side frame 5E which are arranged at intervals on the left and right of the vertical plates 5B and 5C and extend in the front and rear directions, The bottom plate 5A is extended from the vertical plates 5B and 5C in the left and right directions, and a plurality of overhanging beams 5F that support the left and right side frames 5D and 5E are provided at the tips thereof. A front device 4 (foot portion 4A1) is attached to the front side of each of the vertical plates 5B and 5C so as to be able to move up and down, and a counter weight 6 described later is attached to the rear side.

The counterweight 6 is provided at the rear ends of the left and right vertical plates 5B and 5C that form the turning frame 5. The counterweight 6 is for balancing the weight with the front device 4. The rear surface of the counterweight 6 is formed in a substantially arcuate shape centered on the turning center of the upper turning body 3 (see FIG. 2 ).

The engine 7 as a prime mover is located on the front side of the counterweight 6 and provided at the rear of the revolving frame 5. As shown in FIG. 3, the engine 7 is mounted in a horizontally installed state extending in the left and right directions. On the left side, which is one side in the left and right direction of the engine 7, a cooling fan 8 that sucks outside air as cooling air is arranged.

On the other hand, a hydraulic pump (not shown) is arranged on the right side, which is the other side in the left and right directions of the engine 7. The hydraulic pump discharges operating pressure oil toward various hydraulic actuators provided in the upper swing body 3 and the front device 4 when driven by the engine 7. An exhaust gas post-treatment device 9 connected to the exhaust side of the engine 7 is provided above the hydraulic pump. The exhaust gas post-treatment device 9 removes harmful substances in the exhaust gas discharged from the engine 7.

The heat exchange device 10 is arranged facing the cooling fan 8 so as to be located on the upstream side in the flow direction of the cooling air from the cooling fan 8. The heat exchange device 10 includes, for example, a radiator that cools engine cooling water, an oil cooler that cools hydraulic oil, and an intercooler that cools air sucked by the engine 7. The heat exchange device 10 is covered with a building cover 17 and a post-treatment device cover 18, which will be described later.

The hydraulic oil tank 11 is provided on the revolving frame 5 on the front side of the engine 7 and on the right side (one side) across the foot portion 4A1 of the front device 4. The hydraulic oil tank 11 stores hydraulic oil supplied to various actuators mounted on the hydraulic excavator 1. On the other hand, the fuel tank 12 is provided on the revolving frame 5 adjacent to the right side of the hydraulic oil tank 11. The fuel tank 12 stores the fuel supplied to the engine 7.

The step 13 is located on the front side of the hydraulic oil tank 11 and the fuel tank 12, and is provided on the revolving frame 5. That is, step 13 is provided on the right side of the boom 4A of the front device 4 with the boom 4A interposed therebetween. The step 13 is formed in a plurality of steps between the ground and the upper swing body 3, and is used when the worker W moves up and down on the upper swing body 3.

The left lifting handrail 14 is disposed on the left end side of the step 13. The left lifting handrail 14 is provided along the step 13 and can be gripped by the right hand when the worker W climbs on the upper swing body 3, for example. The right lifting handrail 15 is disposed on the right end side of the step 13. The right hand lifting/lowering hand rail 15 is provided along the step 13, and can be gripped by the left hand when the worker W climbs up on the upper swing body 3, for example.

The upper handrail 16 is arranged on the right end side of the fuel tank 12. The upper hand rail 16 is located behind the right lifting hand rail 15 and extends in the front and rear directions. The upper hand rail 16 is for the worker W to hold and stabilize the posture when supplying fuel to the fuel tank 12, for example.

The building cover 17 is located on the rear side of the upper swing body 3 and provided on the swing frame 5. The building cover 17 is provided above the left side plate 17A, the right side plate 17B, and the side plates 17A and 17B, and is equipped with an exhaust gas aftertreatment device 9 including the engine 7, a heat exchange device 10, and the like. It is composed of a top plate 17C that covers the. That is, the building cover 17 is located between the counterweight 6, the cab 23, which will be described later, the hydraulic oil tank 11 and the fuel tank 12, and covers the mounted equipment including the engine 7, the heat exchange device 10 and the like.

The left side plate 17A is located between a cab 23 and a counterweight 6 described later, and stands upright from the left side frame 5D. The left side plate 17A can be opened and closed with the front side as a fulcrum, for example, and maintenance work such as an air cleaner (not shown) for purifying the air supplied to the heat exchange device 10 and the engine 7 can be performed.

The right side plate 17B is located between the fuel tank 12 and the counterweight 6 and stands upright from the right side frame 5E. The right side plate 17B can be opened and closed, for example, using the front side as a fulcrum, and maintenance work for the hydraulic pump and the like can be performed.

The top plate 17C is a portion that is raised when the worker W performs maintenance work on the engine 7, the exhaust gas post-treatment device 9, the heat exchange device 10, and the mounted devices such as a precleaner 22 described later (that is, on the upper swing body 3). ). The aftertreatment device cover 18 that covers the upper side of the exhaust gas aftertreatment device 9, the engine cover 20 that covers the upper side of the engine 7, and the heat exchange that covers the upper side of the heat exchanging device 10 are provided on the upper surface plate 17C. A device cover 21 is provided. In this case, the top plate 17C is provided with an opening (not shown) on the front side of the counterweight 6. This opening opens above the mounted device such as the engine 7, and is normally covered with the post-treatment device cover 18, the engine cover 20, and the heat exchange device cover 21 in order from the right side.

The aftertreatment device cover 18 covers the upper side of the exhaust gas aftertreatment device 9. The aftertreatment device cover 18 is provided with a tail pipe 19 for discharging the exhaust gas purified by the exhaust gas aftertreatment device 9 to the outside. The engine cover 20 is adjacent to the left side of the post-processing device cover 18 and covers the upper side of the engine 7. The post-treatment device cover 18 and the engine cover 20 can be opened and closed in the front and rear directions with the rear side as a fulcrum.

On the other hand, the heat exchange device cover 21 is adjacent to the left side of the engine cover 20 and covers the upper side of the heat exchange device 10. The heat exchange device cover 21 can be opened and closed in the left and right directions with the left side as a fulcrum, for example. The worker W opens and closes the aftertreatment device cover 18, the engine cover 20, and the heat exchange device cover 21 to perform maintenance work on the engine 7, the exhaust gas aftertreatment device 9, the heat exchange device 10, and other mounted equipment. be able to.

As shown in FIG. 2, a rear side of the top plate 17C of the building cover 17 with respect to the foot portion 4A1 of the boom 4A of the front device 4 is a center side A of the building cover 17 in the left and right directions. That is, the center side A is near the front side of the engine cover 20 in the top plate 17C of the building cover 17. In other words, the center side A is located between the foot portion 4A1 of the boom 4A and the engine cover 20 on the top plate 17C of the building cover 17.

The center side A is located on the center side of the vehicle body of the hydraulic excavator 1, and the movement path (moving line) when the worker W who has risen above the upper swing body 3 from step 13 moves toward the side surface side B of the building cover 17 ). Here, the side surface side B is near the left rear side of the cab 23 of the top plate 17C of the building cover 17. That is, the side surface B is a portion of the top plate 17C of the building cover 17, which is surrounded by the upper end of the left side plate 17A, the heat exchange device cover 21, and the rear surface portion 25 of the cab 23. It refers to the neighborhood.

The precleaner 22 is located on the side surface side B of the building cover 17 and projects upward from the top plate 17C. The precleaner 22 removes dust in the air flowing into the air cleaner by, for example, centrifuging dust in the air. Specifically, the air introduced into the pre-cleaner 22 is, after the dust is removed by the pre-cleaner 22, introduced into an air cleaner provided between the heat exchange device 10 and the left side plate 17A and further dust is removed by the air cleaner. After being removed, it is supplied to the engine 7. That is, the air supplied to the engine 7 is cleansed in two stages of the precleaner 22 and the air cleaner.

The cab 23 is arranged on the front side of the engine 7 and on the left side with the foot portion 4A1 of the front device 4 interposed therebetween. That is, the cab 23 is mounted on the front left side of the turning frame 5. The cab 23 is for an operator to ride in, and a driver's seat on which the operator is seated, a steering wheel for traveling, an operating lever for working, and the like (none of which are shown) are arranged inside. The cab 23 is formed by a front surface portion 24, a rear surface portion 25, a left side surface portion 26, a right side surface portion 27, and a top surface portion 28.

The front portion 24 is erected upward from the revolving frame 5, and the front portion 24 is provided with a front window (not shown) for providing a wide front view to an operator seated in the driver's seat. .. Further, on the left end side of the front surface portion 24, there is provided a cab boarding handrail 29 that projects forward from the front surface portion 24 and extends upward and downward. The cab boarding handrail 29 is gripped by an operator when boarding in the cab 23 and when getting off from the cab 23.

The rear surface portion 25 is erected so as to face the rear of the front surface portion 24, and the rear surface portion 25 is provided with a rear window 25A for providing a rear view of the operator from an upper middle portion to a lower middle portion. There is. Then, at a position above the rear surface portion 25 (on the side of the top surface portion 28), a cab to be described later that protrudes rearward from the rear surface portion 25 and extends from the center side A in the left and right directions of the building cover 17 toward the side surface side B. A rear handrail 30 is provided.

The left side surface portion 26 extends in the front and rear directions between the left end of the front surface portion 24 and the left end of the rear surface portion 25. The left side surface portion 26 has a left window 26A from the middle portion in the front and rear directions, and a front side from the middle portion has a door 26B for opening and closing an entrance for an operator to get in and out of the cab 23. It is rotatably attached as a fulcrum. On the other hand, the right side surface portion 27 extends in the front and rear directions between the right end of the front surface portion 24 and the right end of the rear surface portion 25. The right side surface portion 27 is provided with a right window (not shown) for providing the operator's right field of view from the upper and lower intermediate portions to the upper side.

The top surface portion 28 extends in the horizontal direction so as to cover the upper portions of the respective surface portions 24 to 27. On the rear end side of the top surface portion 28, one end side of a cab rear handrail 30 described later is fixed to the right side surface portion 27 side, and the other end side of the cab rear handrail 30 described later is fixed to the left side surface portion 26 side.

Next, the cab rear handrail 30 according to the present embodiment will be described.

The cab rear handrail 30 is located on the top surface portion 28 side of the rear surface portion 25 of the cab 23 and extends in the left and right directions. The cab rear handrail 30 has a two-step height in which the height dimension on the center side A of the building cover 17 is high and the height dimension decreases toward the side surface side B. The cab rear handrail 30 constitutes the handrail of the present invention.

The cab rear handrail 30 is grasped and held in posture, for example, when the worker W moves from the center side A of the building cover 17 to the side face B and when carrying out maintenance work on mounted equipment such as the engine 7 and the precleaner 22. To stabilize the. The cab rear handrail 30 includes an upper horizontal grip portion 31, an inclined grip portion 34, a lower horizontal grip portion 35, and the like.

The upper horizontal grip portion 31 is located in the standing posture region C (see FIGS. 2 and 7) on the center side A of the building cover 17, and is formed parallel to the top plate 17C of the building cover 17. The standing posture region C is set as a movement region when the worker W moves from the center side A of the building cover 17 toward the side face side B.

One end side 31A1 of the upper horizontal grip portion 31 is fixed to the right bracket 32 attached to the top surface portion 28 of the cab 23 by welding or the like, and the extension portion 31A extending rearward from the right bracket 32 and the extension portion 31A. Is formed in an L shape by the horizontal handrail portion 31B extending from the other end side 31A2 toward the left side (side surface side B). An inclined grip portion 34 is connected to the other end 31B1 of the horizontal handrail portion 31B.

The right bracket 32 is formed of, for example, a plate material bent in an L shape, and the one end side 31A1 of the extending portion 31A is fixed to the inner surface side by welding or the like. Then, the right bracket 32 is attached to the top surface portion 28 of the cab 23 using a bolt 33. That is, the one end side 31A1 of the upper horizontal grip portion 31 is fixed to the right end side of the top surface portion 28 via the right bracket 32.

As shown in FIGS. 6 and 7, the upper horizontal grip portion 31 is arranged at the same height as the top surface portion 28 of the cab 23. In this case, the clearance dimension between the rear surface portion 25 of the cab 23 and the horizontal handrail portion 31B is set such that the length of the extension portion 31A in the front and rear directions is such that the worker W can easily grasp the horizontal handrail portion 31B. It is set.

The inclined grip portion 34 is located in the crouching posture area D on the side surface side B of the building cover 17 rather than the standing posture area C, and gradually lowers from the upper horizontal grip portion 31 toward the side surface side B of the building cover 17. There is. The crouching posture region D is set as a region for promoting a stable crouching posture outside the vehicle body when the worker W moves outward from the center of the vehicle body (the upper swing body 3). The inclined gripping portion 34 is linearly inclined downward from the other end side 31B1 of the upper horizontal gripping portion 31 (horizontal handrail portion 31B) toward the side surface side B of the building cover 17.

Since the inclined grip portion 34 is lower from the center side A of the building cover 17 toward the side surface side B, the inclination of the worker W is urged to squat the posture of the worker W moving from the center side A toward the side surface side B. be able to. Therefore, as shown in FIG. 8, the inclined gripping portion 34 allows the worker W to assume a stable crouching posture on the outer peripheral end side (side surface side B) of the vehicle body, and thus the stability of the posture of the worker is improved. Can be improved. Further, for example, when performing maintenance work on the precleaner 22 and the like arranged on the side surface B, the worker W can hold the inclined gripping portion 34 in a crouched state, thus stabilizing the work posture. Therefore, the workability of maintenance work can be improved.

The lower horizontal grip portion 35 is located in the safety stopper area E on the side surface side B of the building cover 17 with respect to the crouching posture area D, and from the other end side 34A of the inclined grip portion 34 to the side surface side B of the building cover 17. Again, it is parallel to the top plate 17C of the building cover 17. The safety stopper area E is set as an area for suppressing the instability of the posture of the worker W who works on the outside (side surface side B) of the vehicle body (the upper swing body 3).

The lower horizontal grip portion 35 extends in the horizontal direction from the other end side 34A of the inclined grip portion 34 and is arranged at a position lower than the upper horizontal grip portion 31. Therefore, for example, when the hand holding the inclined gripping portion 34 slips, the worker W can suppress the posture from becoming unstable by the lower horizontal gripping portion 35 whose sliding direction changes.

Further, the lower horizontal grip portion 35 is provided with a rising portion 36 that rises upward from the other end side 35A of the lower horizontal grip portion 35 and that a midway portion is bent toward the top surface portion 28 of the cab 23. There is. The rising portion 36 has an upper end side 36A (the other end side) fixed to a left bracket 37 attached to the top surface portion 28 of the cab 23 by welding or the like. In this case, when the hand of the operator who holds the inclined gripping portion 34 slips, the operator holds the rising portion 36 to prevent the body from leaning forward toward the side surface side B. be able to.

The left bracket 37 is formed of, for example, a plate material that is bent in an L shape, and the upper end side 36A of the rising portion 36 is fixed to the inner surface side by welding or the like. The left bracket 37 is attached to the top surface portion 28 of the cab 23 using a bolt 38. That is, the upper end side 36A of the rising portion 36 is fixed to the left end side of the top surface portion 28 via the left bracket 37.

The hydraulic excavator 1 according to the present embodiment has the above-mentioned configuration. Next, the operation of the hydraulic excavator 1 will be described.

First, the operator boards the cab 23 and operates the engine 7. Then, the operator can move the hydraulic excavator 1 by operating a traveling handle (not shown) provided in the cab 23 and operate a work operation lever (not shown). Thus, the front device 4 can be used for excavating earth and sand.

Next, a case will be described in which the worker W performs maintenance work on the precleaner 22 arranged on the left end side (side surface side B) of the upper swing body 3.

First, the worker W can climb onto the upper swing body 3 from step 13 provided on the front right side of the swing frame 5. In this case, the worker W can climb onto the upper revolving structure 3 while gripping the left ascending/descending hand rail 14 and the right ascending/descending hand rail 15 arranged on the left and right of the step 13.

Further, an upper hand rail 16 is provided on the right end side of the upper swing body 3 that has climbed up to step 13. Accordingly, the worker W can hold the upper hand rail 16 on the right end side of the upper swing body 3 and stabilize the posture. When the worker W heads for the precleaner 22, the worker W moves through the center side A of the building cover 17 toward the side surface side B.

By the way, it is preferable that the handrail disposed on the upper swing body 3 is installed so as to surround the outer peripheral end of the upper swing body 3. However, since various members such as the engine cover 20 are arranged on the upper swing body 3, it is difficult in terms of layout to install the handrail so as to surround the outer peripheral end of the upper swing body 3. There are cases. When maintenance work or the like is performed near a place where the handrail is difficult to install, the posture of the worker is not stable, which may reduce workability of the maintenance work or the like.

Therefore, in the present embodiment, a cab rear handrail 30 extending leftward and rightward is provided on the rear surface portion 25 side of the cab 23. The cab rear handrail 30 is formed in a two-step shape in which the center side A of the vehicle body is high and the outside (side surface side B) of the vehicle body is low. Specifically, the cab rear handrail 30 includes an upper horizontal grip portion 31 located on the right end side of the cab 23, an inclined grip portion 34 located at an intermediate portion of the cab 23 in the left and right directions, and a left end of the cab 23. It is formed including the lower horizontal grip portion 35 located on the side.

When the worker W moves from the center side A of the building cover 17 toward the side surface side B, the upper horizontal grip portion 31 arranged in the standing posture region C can be gripped. In this case, the upper horizontal grip portion 31 is disposed at the same height position (that is, near the waist portion of the worker W) as the top surface portion 28 of the cab 23 that is easily gripped by the worker W when the worker W is standing. Therefore, the worker W can stably move from the center side A to the side surface side B while gripping the upper horizontal grip portion 31.

Then, when the worker W further moves toward the side surface side B, the inclined grip portion 34 arranged in the squatting posture region D can be gripped. In this case, the inclined gripping portion 34 is linearly inclined downward from the horizontal handrail portion 31B of the upper horizontal gripping portion 31 toward the side surface side B. As a result, when the worker W moves to the side surface B while gripping the inclined gripping portion 34, the posture gradually lowers, and the posture on the side surface B, which is the outer side of the upper swing body 3, becomes a stable crouching posture. be able to.

Then, as shown in FIG. 8, the worker W takes a stable crouching posture near the outside (side surface side B) of the vehicle body. Since the worker can perform maintenance work on the precleaner 22 disposed on the side surface B while maintaining a stable crouching posture, the stability of the working posture and the workability of the maintenance work can be improved. it can.

Further, when the hand holding the inclined gripping portion 34 slips, the worker W can grip the lower horizontal gripping portion 35 or the rising portion 36 arranged in the safety stopper area E. In this case, the lower horizontal grip portion 35 extends from the other end side 34A of the inclined grip portion 34 toward the outside (side surface side B) of the vehicle body (the upper swing body 3) again in parallel with the top plate 17C of the building cover 17. ing. That is, the angle of the lower horizontal grip portion 35 changes at the other end side 34A of the inclined grip portion 34. As a result, when the hand holding the inclined gripping portion 34 slips, the slipping hand can be stopped because the sliding direction changes at the lower horizontal gripping portion 35.

When the maintenance work of the precleaner 22 is completed, the worker W moves up while standing up from the crouching posture region D to the standing posture region C, passes through the center side A of the building cover 17 and moves from step 13 to the ground. You can go back.

Thus, in the present embodiment, the rear surface portion 25 of the cab 23 is provided with the cab rear handrail 30 extending from the center side A of the building cover 17 in the left and right directions toward the side surface side B. The cab rear handrail 30 is located in the standing posture region C on the center side A of the building cover 17, and is located in the standing posture region C in parallel with the top plate 17C of the building cover 17, and the standing posture region C. And a tilted grip portion 34 that is located in the crouching posture area D on the side surface side B of the building cover 17 and that gradually decreases from the upper horizontal grip portion 31 toward the side surface side B of the building cover 17. Accordingly, the worker W can move stably from the center side A of the building cover 17 toward the side surface side B while gripping the cab rear handrail 30.

Further, the inclined grip portion 34 of the cab rear handrail 30 is linearly inclined downward from the upper horizontal grip portion 31 toward the side surface side B of the building cover 17. Accordingly, when the worker W moves from the center side A of the building cover 17 toward the side surface side B, it is possible to gradually promote a stable crouching posture. Further, the worker W can grip the inclined gripping portion 34 in a squat state when performing maintenance work of the mounted device arranged on the side surface side B of the building cover 17. Therefore, the worker W can improve the stability of the work posture on the outer side (side surface side B) of the vehicle body (the upper swing body 3) and the workability when performing the maintenance work.

Further, the upper horizontal grip portion 31 of the cab rear handrail 30 is arranged at the same height position as the top surface portion 28 of the cab 23, and one end side 31A1 of the upper horizontal grip portion 31 is fixed to the top surface portion 28. As a result, the upper horizontal grip portion 31 is located near the waist when the worker W is in the standing posture, so that the upper horizontal grip portion 31 is easily gripped and moves from the center side A of the building cover 17 to the side surface side B. The posture can be stabilized. Further, since the upper horizontal grip portion 31 does not project above the cab 23, for example, an operator can run the hydraulic excavator 1 without having to worry about the height of the cab rear handrail 30.

Further, the cab rear handrail 30 is located in the safety stopper area E on the side surface side B of the building cover 17 with respect to the crouching posture area D, and from the other end side 34A of the inclined grip portion 34 to the side surface side B of the building cover 17. Again, it has a lower horizontal grip 35 that is parallel to the top plate 17C of the building cover 17. Accordingly, when the hand of the worker W holding the inclined gripping portion 34 slips, the slipped hand can be stopped by the lower horizontal gripping portion 35, so that the posture of the worker W becomes unstable. Can be suppressed.

Further, the lower horizontal grip portion 35 has a rising portion 36 that rises upward from the other end side 35A of the lower horizontal grip portion 35, and the upper end side 36A of the rising portion 36 is located at the top of the cab 23. It is fixed to the surface portion 28. Accordingly, the other end of the cab rear handrail 30 can be stably attached to the top surface portion 28 of the cab 23.

In addition, in the above-described embodiment, the cab rear hand rail 30 including the upper horizontal grip portion 31, the inclined grip portion 34, and the lower horizontal grip portion 35 has been described as an example. However, example embodiment as in a modification shown in FIG. 9, the cab rear handrail 41 includes an upper horizontal grip portion 42 whose one end is fixed to the cab 23 through the right bracket 32, the other end of the upper horizontal gripping portion 42 The inclined gripping portion 43 that inclines downward from the side 42A toward the side surface side B of the building cover 17, and the other end side 43A of the inclined gripping portion 43 that extends upward, and the other end side via the left bracket 37 and the cab 23. It may be formed by the rising portion 44 fixed to.

Further, in the above-described embodiment, the case where the cab rear handrail 30 is fixed to the top surface portion 28 of the cab 23 by the right bracket 32 and the left bracket 37 has been described as an example. However, the present invention is not limited to this, and for example, the cab rear handrail may be fixed to the rear surface portion 25 of the cab 23 or the left and right side surface portions 26 and 27. This also applies to the modified example.

Further, in the above-described embodiment, the wheel type hydraulic excavator 1 has been described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines including a cab such as a crawler type shovel and a crane.

1 Hydraulic excavator (construction machinery)
2 Undercarriage (base)
3 Upper revolving structure (revolving structure)
4 Front device 4A1 Foot part 5 Revolving frame 7 Engine (motor)
17 Building cover 17A Left side plate 17B Right side plate 17C Top plate 23 Cab 24 Front part 25 Rear part 26 Left side part 27 Right side part 28 Top part 30 Cab rear handrail (handrail)
31 Upper Horizontal Gripping Part 31A1 One End Side 34 Inclined Gripping Part 34A Other End Side 35 Lower Horizontal Gripping Part 35A Other End Side 36 Standing Part 36A Upper End Side A Center Side B Side Side C Standing Posture Area D Crouching Posture Area E Safety Stopper Area

Claims (2)

A revolving structure mounted so as to be revolvable with respect to the base body, and a front device provided on the revolving structure so as to be able to move up and down,
The revolving structure is
A swivel frame that forms a support structure, and a foot portion of the front device is attached to a front side of the support structure at an intermediate portion in the left and right directions,
A prime mover mounted at the rear of the revolving frame,
The front side of the prime mover and the left or right side of the front device sandwiching the foot portion are arranged to be biased to each other, and are formed by a front surface portion, a rear surface portion, a left side surface portion, a right side surface portion, and a top surface portion. A cab with a driver's seat in
It comprises a left side plate, a right side plate, and an upper face plate which is provided above the respective side face plates and covers the mounted equipment including the prime mover, and the upper face plate is provided with an engine cover which covers the upper side of the prime mover. In a construction machine having a building cover,
The rear surface of the cab is provided with a handrail extending from the center side in the left and right directions of the building cover toward the side surface side,
The handrail is located on the center side of the building cover and is located on the side surface side of the building cover with respect to the upper horizontal grip portion formed in parallel with the top plate of the building cover and the upper horizontal grip portion. From the upper horizontal grip portion toward the side surface side of the building cover, and an inclined grip portion that is gradually lowered, and the side surface side of the building cover from the other end side of the inclined grip portion located on the side surface side of the building cover. Again having a lower horizontal gripping portion that is parallel to the top plate of the building cover ,
The upper horizontal grip portion of the handrail is disposed at the same height as the top surface portion of the cab, and one end side of the upper horizontal grip portion is located at an end portion on the center side of the building cover of the top surface portion. Fixed,
The lower horizontal grip portion has a rising portion that rises upward from the other end side of the lower horizontal grip portion, and an upper end side of the rising portion is a building of the top surface portion of the cab. A construction machine characterized in that it is fixed to the side end of the cover . The construction machine according to claim 1, wherein the inclined grip portion of the handrail is inclined downward in a straight line from the upper horizontal grip portion toward a side surface side of the building cover.

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