JP2021098563A - High-place work vehicle - Google Patents

Abstract

To provide a high-place work vehicle that enables a worker to stably get on and off a work stand in a getting-on/off attitude.SOLUTION: A high-place work vehicle comprises a basket support part 33 that supports a basket 30 by being expanded downward from the basket 30 in a getting-on/off attitude to ground a lower end part thereof. This can stably hold the attitude of the basket 30 in the getting on/off attitude, so that a worker can stably get on and off the basket 30 in the getting on/off attitude.SELECTED DRAWING: Figure 4

Description

The present invention relates to, for example, an aerial work platform in which a truck vehicle is provided with an aerial work platform.

Conventionally, this type of aerial work platform includes a vehicle body running on the ground, a boom provided on the vehicle body, and a work table supported by the tip of the boom, and the work table is positioned near the ground. It is known that a worker gets on the work table from the ground or gets off the work table from the work table by taking the boarding / alighting posture (see, for example, Patent Document 1).

Jikkenhei 06-87397

In the aerial work platform, when a worker gets on and off between the work platform in the boarding / alighting posture and the ground, the work platform moves up and down due to the bending of the boom, and the work platform gets on and off between the work platform and the ground. Workers may lose their balance.

An object of the present invention is to provide an aerial work platform on which an operator can stably get on and off a work table in an getting on and off posture.

The present invention includes a vehicle body that can move on the ground, a boom provided on the vehicle body, and a work table supported by the tip of the boom in order to achieve the object, and the work table is grounded. It is an aerial work platform that allows workers to get on and off between the ground and the workbench by setting it in the boarding / alighting posture located in the vicinity of the above. A workbench support portion for supporting the workbench is provided by grounding the lower end portion of the workbench.

As a result, when the worker gets on and off between the work table and the ground in the boarding / alighting posture, the work table is supported by the ground, so that the posture of the work table is stably maintained.

According to the present invention, since the posture of the work table can be stably maintained, the operator can get on and off the work table in the boarding / alighting posture in a stable manner.

It is a side view of the aerial work platform which shows the 1st Embodiment of this invention. It is a side view of the main part of an aerial work apparatus. It is a block diagram which shows the control system. It is a side view of the aerial work platform in the boarding / alighting posture. It is a perspective view of the basket which shows the 2nd Embodiment of this invention. It is a side view of the main part of an aerial work apparatus. It is a side view of the main part of an aerial work apparatus. It is a figure which shows other example of the basket support part. It is a figure which shows other example of the basket support part.

1 to 4 show the first embodiment of the present invention.

As shown in FIG. 1, the aerial work platform 1 of the present invention includes a vehicle body 10 composed of a truck vehicle for traveling on a general road or a work area, an aerial work platform 20 for performing aerial work, and the aerial work platform 20. It has.

As shown in FIG. 1, the vehicle body 10 has a chassis frame 11 extending in the front-rear direction, a driving cab 12 is provided on the front side of the chassis frame 11, and an aerial work device 20 is provided on the rear side via a subframe 13. It is provided. Further, the vehicle body 10 has wheels 14 provided on both left and right sides on the front side and the rear side of the chassis frame 11, and is driven by receiving the power of the engine. Further, the vehicle body 10 is provided on both the left and right sides of the front side and the rear side of the subframe 13, and is provided with four outrigger jacks 15 for stably supporting the vehicle body 10 during work by the aerial work device 20. The front outrigger jack 15 is arranged behind the wheels 14 located on the front side of the vehicle body 10. Further, the rear outrigger jack 15 is arranged behind the wheel 14 located on the rear side of the vehicle body 10. Further, the vehicle body 10 has a step 16 for the operator to move from the upper surface of the vehicle body 10 toward the basket of the high-altitude work device 20 located above the driving cab 12, which will be described later. The step 16 is formed in a range from the rear surface side of the driving cab 12 in the vehicle body 10 to the upper surface of the driving cab 12.

As shown in FIG. 1, the aerial work device 20 is provided as a swivel table 21 capable of horizontally turning, a telescopic boom 22 capable of undulating with respect to the swivel table 21, and a work table provided at the tip of the telescopic boom 22. It is equipped with a basket 30 and. The swivel table 21 performs a horizontal swivel operation with respect to the vehicle body 10 by a hydraulic swivel table swivel motor (not shown). The telescopic boom 22 undulates with respect to the swivel base 21 by a hydraulic undulating cylinder 22a, and expands and contracts by a hydraulic telescopic cylinder (not shown). The basket 30 is held by a leveling cylinder (not shown) so that the work floor, which will be described later, is always horizontal regardless of the undulation angle of the telescopic boom 22, and a basket swivel motor (not shown) horizontally swivels the tip of the telescopic boom 22. I do.

As shown in FIGS. 1 and 2, the basket 30 includes a work floor 31 on which an operator stands, a handrail 32 surrounding the outer peripheral portion of the work floor 31 on the upper surface side of the work floor 31, and a lower side from the work floor 31. It is provided with a basket support portion 33 as a work table support portion for supporting the basket 30 by projecting the basket 30 to the ground.

The work floor 31 has a rectangular floor surface, and one long side is swingably connected to the tip of the telescopic boom 22.

The handrail 32 is made of a tubular member made of metal, and connects a plurality of pillars 32a extending upward at intervals on the outer peripheral portion of the work floor 31 and adjacent upper ends of the plurality of pillars 32a to connect the work floor. It has a handrail portion 32b extending along the outer peripheral portion of the work floor 31 in parallel with the floor surface of the 31. Further, the handrail 32 located on one short side side of the work floor 31 is provided with an entrance / exit 32c for an operator to get on / off the basket 30.

The basket support portion 33 includes a rolling roller 33a that can roll on the ground G when the outer peripheral surface touches the ground, and a grounding detecting portion 33b for detecting a state in which the rolling roller 33a touches the ground. ..

The rolling roller 33a is arranged at a substantially central portion in the longitudinal direction and a substantially central portion in the lateral direction on the lower surface of the work floor 31. The rolling roller 33a is rotatably supported on the lower surface side of the work floor 31 with its rotation axis oriented in the longitudinal direction of the work floor 31, and a part of the outer peripheral surface projects downward from the lower surface of the work floor 31. Further, the rolling roller 33a is movably supported in the vertical direction within a predetermined range with respect to the work floor 31, and is urged downward by the roller urging spring 33a1.

The grounding detection unit 33b has a distance detector such as a non-contact type displacement sensor provided on a member that moves in the vertical direction together with the rolling roller 33a, and determines the distance from the distance detector to the member on the work floor 31 side. By measuring, the grounding of the rolling roller 33a is detected.

Further, the aerial work platform 1 includes a controller 40 as a workbench stop control unit for controlling the operation of the aerial work platform 20.

The controller 40 includes a CPU, a ROM, a RAM, and the like. When the controller 40 receives the input signal from the device connected to the input side, the CPU reads the program stored in the ROM based on the input signal and stores the state detected by the input signal in the RAM. , Send an output signal to a device connected to the output side.

On the input side of the controller 40, as shown in FIG. 3, a grounding detection unit 33b and a swivel table side operation input unit 41 for an operator to input an operation related to the operation of the aerial work device 20 on the swivel table 21. , The basket-side operation input unit 42 for the worker boarding the basket to input the operation related to the operation of the high-altitude work device 20 is connected.

Further, on the output side of the controller 40, as shown in FIG. 3, a control for controlling the flow direction and the flow amount of the hydraulic oil supplied to the swivel swivel motor, the undulating cylinder 22a, the telescopic cylinder and the basket swivel motor. The valve unit 43 is connected.

In the aerial work platform 1 configured as described above, when the work is performed by the aerial work device 20, the outrigger jack 15 is first projected outward in the width direction of the vehicle body 10 and is provided at the lower end portion. By grounding the float, the vehicle body is lifted.

Next, the worker boarding the basket 30 may board the basket 30 from the entrance / exit 32c by using step 16 while keeping the running posture in which the high-altitude work device 20 is running by the vehicle body 10. FIG. As shown in the above, the basket 30 is boarded from the boarding / alighting port 32c as a boarding / alighting posture which is a posture in which the basket 30 is positioned near the ground G.

When the high-altitude work device 20 is in the boarding / alighting posture, the operator operates the swivel-side operation input unit 41 to move the basket 30 to the vicinity of the ground G.

At that time, when the basket 30 moves in the vertical direction by the operation of the swivel table side operation input unit 41 by the operator, the rolling roller 33a abuts on the ground G and moves to the work floor 31 side without rotating. To do. As a result, the controller 40 detects the grounding of the rolling roller 33a based on the change in the detected value of the grounding detection unit 33b, and stops the operation of the basket 30 in the vertical direction.

Further, when the basket 30 is moved diagonally downward by extending the telescopic boom 22 from a posture in which the tip end portion of the telescopic boom 22 is directed diagonally downward by the operation of the swivel side operation input unit 41 by the operator. When the rolling roller 33a comes into contact with the ground G, it moves to the work floor 31 side while rotating. As a result, the controller 40 detects the grounding of the rolling roller 33a based on the change in the detected value of the grounding detection unit 33b, and stops the extension operation of the expansion / contraction boom 22.

Since the basket 30 that has stopped operating is in a state of being supported by the ground G via the rolling roller 33a, the operator can board the basket 30 in a stable posture without losing the balance.

Further, when the worker who is in the basket 30 gets off the basket 30 with the high-altitude work device 20 in the boarding / alighting posture, he / she operates the basket side operation input unit 42 to bring the basket 30 to the vicinity of the ground G. Move. At this time, when the work floor 31 of the basket 30 moves to the vicinity of the ground G and the rolling roller 33a comes into contact with the ground G and moves to the work floor 31 side, the controller 40 causes the grounding detection unit 33b to detect the value. The contact of the rolling roller 33a is detected based on the change, and the operation of the telescopic boom 22 is stopped.

Since the basket 30 that has stopped operating is in a state of being supported by the ground G via the rolling roller 33a, the operator can get off the basket 30 in a stable posture without losing the balance.

As described above, according to the aerial work platform of the present embodiment, the basket support portion 33 that supports the basket 30 is provided by projecting downward from the basket 30 and grounding the lower end portion in the boarding / alighting posture.

As a result, the posture of the basket 30 can be stably held in the boarding / alighting posture, so that the operator can get on / off the basket 30 in the boarding / alighting posture in a stable manner.

Further, a grounding detection unit 33b for detecting the grounding of the lower end portion of the basket support unit 33 is provided, and when the grounding detection unit 33b detects the grounding of the rolling roller 33a, the movement of the basket 30 is stopped.

As a result, the basket 30 can be reliably supported by the basket support portion 33 in the boarding / alighting posture without the worker continuing to visually check the position of the basket 30, so that the work load on the worker can be reduced. It becomes possible.

Further, the basket support portion 33 has a rolling roller 33a that can roll on the ground G when the outer peripheral surface touches the ground.

As a result, even when the basket 30 is moved diagonally downward and the basket 30 is supported by the basket support portion 33, the rolling roller 33a rotates when the basket 30 touches the ground, so that the basket is further supported without damaging the ground G. It is possible to prevent damage to the portion 33.

In the first embodiment, the grounding detection unit 33b that detects the grounding of the rolling roller 33a based on the change in the vertical position of the rolling roller 33a with respect to the work floor 31 is shown, but the present invention is not limited to this. Absent. As the grounding detection unit, for example, the grounding of the rolling roller may be detected by detecting the rotation of the rolling roller with a rotary encoder or the like.

Further, in the first embodiment, the basket support portion 33 having the rolling roller 33a capable of rolling on the ground G when the outer peripheral surface touches the ground is shown, but the present invention is not limited to this. The basket support portion may have a portion that does not have the rolling roller 33a and simply abuts on the ground G as long as the basket 30 can be supported by touching the ground.

5 to 7 show a second embodiment of the present invention. The same components as those in the above embodiment are designated by the same reference numerals.

As shown in FIG. 5, the basket 30 in the present embodiment includes a basket support portion 34 as a work table support portion having a function as a door for opening and closing the lower side of the entrance / exit 32d provided on the side surface side of the basket 30. I have.

The entrance / exit 32d is an opening surrounded by a pillar portion 32a and a handrail portion 32b on a side surface of the basket 30 facing the side surface to which the telescopic boom 22 is connected. The boarding / alighting port 32d is provided with a safety bar 32d1 that crosses the boarding / alighting port 32d in the horizontal direction and is movable in the vertical direction between the central portion and the upper end portion in the vertical direction.

The basket support portion 34 has a support portion main body 34a as a movable member oscillatingly connected to the lower end portion of the entrance / exit 32d, and a grounding roller 34b provided on the support portion main body 34a.

The support portion main body 34a is a plate-shaped member formed so that the size in the width direction is slightly smaller than the size in the width direction of the entrance / exit 32d. One end of the support body 34a is connected to the lower end of the entrance / exit 32d, and is within the range of a posture in which the other end is directed upward and a posture in which the other end is directed downward with the one end as the center. It can swing with. The support portion main body 34a has a closed posture in which the lower side of the entrance / exit 32d is closed by turning the other end upward, and an open posture in which the lower side of the entrance / exit 32d is opened by turning the other end downward. .. The support portion main body 34a is swingably connected to the lower end portion of the entrance / exit 32d via an elongated hole 34a1 extending from one end to the other end, and moves in the vertical direction within the range of the elongated hole 34a1 in the closed posture. It's free.

Between one end and the other end on both sides of the support body 34a, a protrusion 34a2 extending in the width direction and protruding from the surface is provided. The projecting portion 34a2 is manually gripped by the operator when performing an operation of changing the posture of the support portion main body 34a between the closed posture and the open posture. Of the protruding portions 34a2 on both sides of the supporting portion main body 34a, the protruding portion 34a2 located on the outer peripheral side of the basket 30 in the open posture of the supporting portion main body 34a can be used as a step for an operator who gets on and off the basket 30 to step on. Function.

As shown in FIG. 5, the other end side of the support portion main body 34a engages with the hook support portion 32d2 extending inward in the width direction from the substantially central portion in the vertical direction of the pillar portion 32a on the outer side in the width direction of the entrance / exit 32d. Engagement hooks 34a3 are provided. The engaging hook 34a3 engages with the hook support portion 32d2 by lifting the other end of the support portion main body 34a in the open posture upward and moving the support portion main body 34a downward as shown in FIG. As a result, the support portion main body 34a is in the closed posture. Further, when the support portion main body 34a in the closed posture is moved upward to release the engagement between the hook support portion 32d2 and the engagement hook 34a3 and the other end portion is moved toward the outside of the basket 30. As shown in 7, the posture is released.

The outer peripheral surface of the grounding roller 34b comes into contact with the ground G in a state where the aerial work device 20 is in the boarding / alighting posture and the support portion main body 34a is in the open posture. The grounding roller 34b can switch between the regulation of rotation and the release of the regulation of rotation. The restriction on the rotation of the ground roller 34b and the release of the restriction on the rotation are switched by a mechanical or electrical switching mechanism that can be switched by the operator on the basket 30.

In the aerial work platform 1 configured as described above, when the aerial work platform 20 is in the boarding / alighting posture, the worker takes the support portion main body 34a in the open posture and sets the swivel table side operation input unit 41 in the open posture. Operate to move the basket 30 toward the ground G. At this time, the grounding roller 34b located at the lower end of the support portion main body 34a is in a state where the rotation is restricted. Further, when the support portion main body 34a is in the open posture, the operator operates the support portion main body 34a while grasping the protruding portion 34a2 of the support portion main body 34a.

When the work floor 31 of the basket 30 is moved to the vicinity of the ground G, the grounding roller 34b located at the lower end of the support portion main body 34a in the open posture comes into contact with the ground, so that the operator stops the operation of the basket 30.

As a result, the basket support portion 34 supports the basket 30 by the grounding roller 34b touching the ground while the high-place work device 20 is in the boarding / alighting posture and the support portion main body 34a is in the open posture.

The basket 30 that has stopped operating is in a state of being supported by the ground G by the basket support portion 34. Therefore, the worker can board the basket 30 in a stable posture without losing the balance. At this time, since the worker can board the work floor 31 of the basket 30 while putting his / her foot on the protruding portion 34a2 of the support portion main body 34a, he / she can easily board the basket 30.

Further, the worker who has boarded the basket 30 performs an operation of moving the basket 30 after the support portion main body 34a is in the closed posture. At this time, the weight of the basket 30 and the operator acts on the support portion main body 34a, but by removing the restriction on the rotation of the grounding roller 34b, the support portion main body while the operator is on the basket 30. It is possible to swing 34a. When the support portion main body 34a is in the closed posture, the operator operates while grasping the safety bar 32d1 with one hand and the protruding portion 34a2 of the support portion main body 34a with the other hand.

As described above, according to the aerial work platform of the present embodiment, it is possible to stably hold the posture of the basket 30 in the boarding / alighting posture as in the above-described embodiment. This allows workers to get on and off in a stable manner.

Further, the basket support portion 34 has a function as a door for opening and closing the entrance / exit 32d provided on the side surface side of the basket 30 so that the operator can get on / off the basket 30. The basket 30 is supported by the lower end portion touching the ground in a state where the entrance / exit 32d is opened in the posture.

As a result, the basket support portion 34 has a function of supporting the basket 30 in the boarding / alighting posture of the aerial work device 20 and a function of a door for opening / closing the boarding / alighting port 32d. Compared with the case, the number of parts can be reduced, the weight can be reduced, and the manufacturing cost can be reduced.

Further, the support portion main body 34a of the basket support portion 34 has a protruding portion 34a2 that functions as a step for the operator to put his / her foot on the basket with the entrance / exit 32d open.

As a result, the worker can get on and off the basket 30 while hanging his foot on the protrusion 34a2, so that the worker can get on and off the basket 30 more easily.

Further, the basket support portion 34 has a grounding roller 34b that can be grounded when the boarding / alighting posture of the aerial work device 20 and the boarding / alighting port 32d are open. Can be switched.

As a result, even when the weight of the basket 30 and the worker acts on the basket support portion 34 when the worker gets on the basket 30, the basket support portion is released from the restriction on the rotation of the grounding roller 34b. It is possible to release the state in which the basket 30 is supported by the 34 and put the support portion main body 34a in the closed posture.

In the second embodiment, the operation of the basket 30 is stopped by the operation of the operator. However, as in the first embodiment, the basket support portion 34 is grounded to detect the grounding. A detection unit may be provided.

Further, in the first and second embodiments, the aerial work platform 1 in which the aerial work platform 20 is mounted on the vehicle body 10 made of a truck vehicle capable of traveling on a general road is shown, but the present invention is not limited to this. Absent. For example, the present invention can be applied to, for example, an aerial work platform in which an aerial work platform is mounted on a crawler-type vehicle body that can move only within a work area.

Further, in the first embodiment, the basket support portion 33 to which the rolling roller 33a touches the ground is shown, and in the second embodiment, the basket support portion 34 having a function of a door for opening and closing the entrance / exit 32d is shown. The basket support portion is not limited to this as long as it is a basket support portion that supports the basket 30 by projecting downward from the basket 30 and grounding the lower end portion in the boarding / alighting posture.

For example, as shown in FIGS. 8 and 9, a tubular member 35a extending downward from the lower surface of the work floor 31 and a rod-shaped member 35b as a movable member slidably provided in the tubular member 35a are provided. It may be a basket support portion 35 that supports the basket 30 by grounding the lower end of the rod-shaped member 35b fixed in a protruding state with respect to the tubular member 35a.

The basket support portion 35 shown in FIG. 8 can move the protrusion 35b1 protruding from the outer peripheral surface of the rod-shaped member 35b along the elongated holes 35a1 formed in the tubular member 35a in the axial and circumferential directions. Is. The basket support portion 35 shown in FIG. 8 can be switched between a posture in which the rod-shaped member 35b protrudes from the tubular member 35a and a posture in which the rod-shaped member 35b is stored by a manual operation of the operator.

The basket support portion 35 shown in FIG. 9 can be manually operated by an operator with a bolt 35a2 screwed into a screw hole penetrating the tubular member 35a in the radial direction. The basket support portion 35 shown in FIG. 9 is a tubular member by tightening the bolt 35a2 at an arbitrary position between the posture in which the rod-shaped member 35b is projected to the maximum and the posture in which the rod-shaped member 35b is retracted with respect to the tubular member 35a. It is possible to fix the rod-shaped member 35b to the 35a.

1 ... High-altitude work vehicle, 10 ... Body, 20 ... High-altitude work device, 22 ... Telescopic boom, 30 ... Basket, 33 ... Basket support, 33a ... Rolling roller, 33b ... Grounding detector, 34 ... Basket support , 34a ... Support body, 34b ... Ground roller, 35 ... Basket support, 35a ... Cylindrical member, 35b ... Rod-shaped member, 40 ... Controller, 43 ... Control valve unit, G ... Ground.

Claims (7)

A vehicle body that can move on the ground, a boom provided on the vehicle body, and a work table supported by the tip of the boom are provided, and the work table is placed in a boarding / alighting posture in the vicinity of the ground. An aerial work platform that allows workers to get on and off between the ground and the workbench.
An aerial work platform provided with a workbench support portion that supports the workbench by projecting downward from the workbench and grounding the lower end portion in the boarding / alighting posture. A grounding detection unit that detects the grounding of the lower end of the workbench support unit,
The aerial work platform according to claim 1, further comprising a work platform stop control unit that stops the movement of the work table when the ground contact detection unit detects that the lower end of the work table support portion is grounded. The aerial work platform according to claim 1 or 2, wherein the workbench support portion has a rolling roller that can roll on the ground when the outer peripheral surface touches the ground. The workbench support portion has a movable member that can be moved with respect to the workbench, and the workbench is grounded by grounding the end of the movable member in a posture in which the end of the movable member is directed downward. The aerial work platform according to any one of claims 1 to 3. The movable member has a function as a door for opening and closing an entrance / exit port provided on the side surface side of the work table so that an operator can get on / off the work table, and the entrance / exit is opened in the boarding / alighting posture. The aerial work platform according to claim 4, wherein the work platform is supported by grounding the lower end portion of the work platform. The aerial work platform according to claim 5, wherein the movable member has a step on which an operator puts his / her foot in a state where the entrance / exit is open. A grounding roller whose outer peripheral surface can be grounded is provided at the lower end of the movable member with the entrance / exit port open.
The aerial work platform according to claim 5 or 6, wherein the grounding roller can switch between the regulation of rotation and the release of the regulation of rotation.

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