JPS5814538B2 - aerial work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle for aerial work, and particularly to a vehicle for aerial work suitable for use in a narrow space and in a crowded place with many obstacles.

For example, in the space between the bridge girders of a large bridge, etc.
When carrying out maintenance, painting, repair, etc., it is extremely disadvantageous both economically and from the standpoint of work efficiency to erect fixed scaffolding.

Therefore, there is a need for an aerial work vehicle that is mobile and has a work platform that can be raised and lowered.

This work vehicle must also be able to move in a narrow space with quick turns, and for this purpose, the volume (especially height) of the work vehicle when the work platform is folded must be extremely small.

The first thing that can be considered to realize these requirements is the magic hand mechanism (rage tong mechanism).
This has the drawback that it is not only unstable when stretched, but also that the folded height cannot be lowered beyond a certain limit.

Therefore, for example, when working between bridge girders, steel materials such as columns, beams, diagonals, etc. are complicated, and even water pipes, gas pipes,
There were many obstacles such as telephone cables, and it was unsuitable for moving through them while stretching and contracting.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an aerial work vehicle having a work platform that can be folded extremely low and extended extremely high when working at height. be.

According to the present invention, the above object is to provide a support that can be moved upright and tilted by moving back and forth on a trolley that runs on a guide rail through wheels, etc., and that this support is telescopically expanded and contracted by a hydraulic cylinder. This is achieved by adopting a structure in which a workbench is attached to the tip of this support via a rotatable arm.

Hereinafter, details of the present invention will be explained in conjunction with embodiments shown in the drawings.

1 and 2 illustrate one embodiment of the present invention. In the figures, the reference numeral 1 indicates a truck, which has a plurality of pairs of wheels 3 that move on guide rails 2. FIG.

In front of the vehicle, there are provided a lower operation panel 4 and a hydraulic unit 5 for traveling and hydraulic drive operations.

A pair of left and right guide rails 6, 6 are provided horizontally on the trolley 1, and on these guide rails 6, a bracket 8 is attached to the tip of a bracket 8 attached to the lower end of a support 7 with its axis perpendicular to the lower end of the support 7. Guide rollers 10 are rotatably supported on both ends of the attached support frame 9.

On the other hand, projecting pieces 11 are protruded from the lower surface near both ends of the support frame 9, and these projecting pieces are connected to an endless chain 14 stretched between subrockets 12 and 13 that are supported on the front and rear of the truck 10, respectively. has been done.

Therefore, when the endless chain 14 is driven by a hydraulic motor or the like, the support frame 9, that is, the support column 7, is moved back and forth.

As is clear from FIG. 2, a support shaft 15 is mounted in the middle of the support column 7 in a perpendicular state, and both ends of the support shaft 15 are rotatably supported on the upper end of a slide frame 16, respectively.

The lower ends of these slide frames 16 are slidably fitted into a guide frame 17 installed on the truck 1.

The support column 7 still has a hollow cylindrical shape, and an elevating frame 18 is fitted therein so as to be able to move up and down. Fixed.

On the other hand, a rotating member 21 is fixed to the tip of the elevating frame 18 while maintaining an orthogonal state, and the lower ends of a pair of support arms 22 and 23 forming two sides of the parallel link mechanism are rotatably attached to both ends of the rotating member 21. It is mounted on a shaft.

A hydraulic cylinder 24 is installed between the support arm 22 and the rotating member 21, respectively.
4, the support arms 22, 23 are freely rotated up and down.

An upper operation panel 25 is provided at the upper end of the pair of support arms 22 and 23.
A workbench 26 having a rotatable shaft is rotatably supported.

Since the pair of support arms 22 and 23 constitute a parallel link mechanism together with the pair of support arms 22 and 23 and the rotating member 21, the workbench 26 can always maintain a horizontal state even if these arms are rotated. can.

Incidentally, a swing hydraulic motor 28 is attached to the upper end of the lift frame 18, and the swing member 21, and hence the workbench 26, can be horizontally turned when the lift frame 18 is in an upright state.

In addition, in the case of a bridge girder, the objects indicated by the reference numeral 27 in FIG. 1 are obstacles such as gas pipes, water pipes, and cables.

Next, the operation of this embodiment configured as above will be explained.

First, the cart 1 is moved to the target position passing under the obstacle 27 with the support column 7 in a folded state (see the two-dot chain line in FIG. 1).

At this time, the support arms 22 and 23 are folded under the support column 7, the work platform 26 is at its lowest position and in contact with the side surface of the column 7, and the lifting frame 18 is also at its lowest position. It is housed within the support column γ so that

In this state, the support column 7 is positioned horizontally, and the bracket 8 is positioned at the rear end of the truck 1.

When it is desired to enter the working state from the folded state, a hydraulic motor (not shown) whose output shaft is connected to either chain chain block N2 or 13 is operated to reverse the endless chain 14. Run clockwise.

As a result, the strut 7 moves forward to the left in FIG. 1 and rises while rotating around the bearing of the support shaft 15 against the slide frame 16, and when the bracket 8 reaches the forward end, the strut 7 is in an upright state. At the same time, the running of the endless chain 14 is stopped.

In this state, the hydraulic cylinder 19 is operated to extend the elevating frame 18.

The degree of elevation of the elevating frame 18 can be freely selected according to the desired height of the work.

Simultaneously with the lifting of the lifting frame 18 or after the lifting is completed, the support arms 22, 23 are rotated to a desired angle by operating the hydraulic cylinder 24, and the hydraulic motor 27 is operated to rotate the supporting arms 22, 23 to a desired angle. The member 21 is pivoted to orient the workbench 26 in the desired direction.

When folding, the operation opposite to the above may be performed.

Note that the worker gets on the workbench 26, and it goes without saying that the workbench 26 is at its lowest limit when transferring.

Furthermore, although this example uses an endless chain as the mechanism for moving the support via the bracket, it is also possible to use a rack and pinion mechanism, a wire, a hydraulic cylinder, etc. , the choice is free.

Furthermore, although the strut structure is of a two-stage type, it is of course possible to employ a telescopic type with two or more stages.

Furthermore, it is also possible to attach a vertical movement mechanism such as a hydraulic cylinder or a screw to the slide frame 16 so that the support column 7 can be raised and lowered.

With this configuration, the horizontal movement mechanism mainly consisting of the endless chain 14 can be omitted.

As is clear from the above description, according to the present invention, the rear end of a column that can be telescopically expanded and contracted on a trolley that can move on guide rails and has a workbench attached to its tip via an arm of a parallel link mechanism is attached to a bracket. The structure is such that it can be extended and retracted by a moving device through the support, and the structure is rotatably supported in the middle of this support via a sleight frame that can be raised and lowered. When the target position is reached, the pillar can be erected while avoiding obstacles, and the pillar can be extended while avoiding obstacles, and after the pillar is erected, the pillar can be moved between obstacles. This has the excellent effect of enabling work at heights to be carried out effectively in spaces with intricate obstacles.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being a front view. 1... Dolly, 6... Guide rail, 7... Support, 8... Bracket, 10... Guide roller, 12, 13... Sprocket,
14...Endless chain, 15...Support shaft, 16...Slide frame, 17...Guide frame, 18...Elevating frame, 21...Swivel member, 22.23...Support arm, 24...Hydraulic cylinder, 28...Swivel hydraulic motor.

Claims (1)

[Claims] 1 A trolley 1 having a self-propelling function with a guide rail 6 laid on the upper surface and a guide frame 17, a slide frame 16 provided vertically on the guide frame 17 of this trolley 1, and an elevating frame 1B that is extendable and retractable. A column 7 is rotatably supported on the slide frame 16 via a support shaft 15 so that it can be raised and lowered up and down, and a support frame 9 at the tip thereof.
The guide roller 10 attached to the guide rail 6
A bracket 8 is fixed to the lower part of the support column 7 at a substantially right angle to the support column 7, and the bracket 8 is moved along the guide rail 6, and the slide frame 16 is moved along the guide frame 17. raising/lowering drive devices 12, 13, and 14 for raising and lowering the support column 7 up and down about the support shaft 15, and the lifting frame 1;
a swinging member 21 that is attached to the upper end of B so as to be horizontally swingable when the lifting frame 18 is in an upright state, and is rotated relative to the lifting frame 18 by a swinging drive device 28;
A pair of support arms 22.23 are attached to the rotating member 21 so as to be rotatable up and down and are rotated up and down by a driving device 24 for vertical movement. An aerial work vehicle characterized in that it is equipped with a work platform 26 which is journalled and forms a parallel link mechanism together with support arms 22, 23 and a pivoting member 21.