JP2541687Y2 - Crane equipment for working at height - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane device for working at height which is attached to the tip of a boom that can be raised and lowered provided on a working vehicle at height.

[0002]

2. Description of the Related Art For electric work or the like on a utility pole, a high work vehicle having a body provided with a boom which can be raised and lowered and a work table for a worker to be mounted at the end of the boom is used. Such an aerial work vehicle is often provided with an aerial work crane device at the tip of a boom (e.g., in front of a workbench). This crane apparatus for working at height includes a crane arm pivotally mounted on an upper base (often swivelable) attached to the tip of a boom so as to be able to move up and down. The operation of raising and lowering the crane arm with respect to the upper base is performed in such a manner that the arm attached to the front of the crane arm and the lower part of the crane arm and the front of the upper base is located forward of the undulation pivoting portion of the crane arm. This is performed by the expansion and contraction operation of the undulating cylinder. In such a crane device, the crane arm is appropriately raised and lowered by an arm raising and lowering cylinder, the rope is hung from the front end of the crane arm, and the rope is wound up by a winch, so that an object attached to the lower end of the rope is wound. (E.g., power distribution equipment) can be lifted to near the tip of the boom, such as in front of a workbench.

[0003] By the way, when the above-mentioned electric work is performed using such a crane device, it is necessary to cross over a plurality of electric wires supported in parallel in the horizontal direction by the electric pole due to the mounting position of the object on the electric pole. In some cases, it is necessary to extend the crane arm and suspend the object by hanging a rope from between the electric wires.

[0004]

However, at the mounting position of the arm hoist cylinder in the conventional crane device, the arm hoist cylinder may interfere with the electric wire arranged on the near side, so that the front end of the crane arm However, there is a problem that the so-called "foot" cannot be reached to the vicinity of the upper part of the electric wire which is too far away. In addition, since the arm up-and-down cylinder may interfere with the electric wire, it is necessary to insulate the arm up-and-down cylinder in consideration of safety in hot-line work. Processing is difficult).

[0005] The present invention has been made in view of the above-described problems, and has a wide "foot" under a crane arm, and a front end of the crane arm extending over a nearby obstacle. It is an object of the present invention to provide a crane device for working at heights, which makes it possible to reach as far as possible.

[0006]

In order to achieve the above-mentioned object, in the crane apparatus for working at height according to the present invention, the arm hoisting cylinder is arranged rearward of the crane arm on the crane arm. I have arranged. The lifting drive link may be configured so that the crane arm is raised and lowered by the extension operation of the arm lifting cylinder.

[0007]

In such a crane device for working at heights, the crane arm must be moved over a nearby obstacle in a space ("futo") between the lower part of the front part of the crane arm and the upper base. Nothing interferes with the obstacle when extended. For this reason, the lifting position, which is the front end of the crane arm, can be made farther from the obstacle by a distance closer to the arm length of the crane arm (length in front of the undulating pivot).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle equipped with the aerial work crane device according to the present invention will be described with reference to FIG. The aerial work vehicle 20 is provided with a lower swivel 22 which is rotatable with respect to the body 21 at the front of the body 21. A boom 23 configured to be telescopically extendable and retractable is pivotally attached to the upper portion of the lower swivel 22 so as to be able to move up and down. The raising and lowering operation of the boom 23 is performed by the expansion and contraction operation of a boom raising and lowering cylinder 25 attached between a lower portion of the middle portion of the boom 23 and a front portion of the lower swivel 22. A support frame 26 is attached to a tip of the boom 23. At the rear upper portion of the support frame 26, a cockpit 27 for boarding an operator is attached. In addition, two manipulator arms 28, 28 are attached to the upper front side of the support frame 26. The operator who has boarded the cockpit 27 can operate the lower swivel 22 and the boom 23 to move to an arbitrary height through an operation from the inside thereof, and further remotely controls the operation of the manipulator arms 28, 28. The work of attaching the power distribution equipment 31 to the power pole 30 can be safely performed without directly touching the power distribution equipment 31 or the live electric wire 32.

Further, at the front of the support frame 26, the above-mentioned crane device 10 for working at heights is mounted. Hereinafter, the crane device 10 will be described with reference to FIG. The crane device 10 includes a support frame 26
A crane arm 3 pivotally mounted on an upper swivel (upper base) 1 that can freely swivel. More specifically, the crane arm 3 pivots upward and downward at the front lower side of a pivoting side plate 3c extending downward from the rear end of the crane arm 3 (split in the width direction of the arm 3). The base 1 is pivotally attached to the lower rear of the rear part so as to be able to move up and down. The crane arm 3 is configured to be telescopically expandable and contractible, and the length of the arm (the length of the entire length of the crane arm 3 in front of the up-and-down pivotal connection 3a with respect to the upper swivel 1) can be adjusted by the expansion and contraction. it can. In addition, a sheave 3s is provided at the front end of the crane arm 3.
Is rotatably mounted. Further, a winch 4 is attached to the upper surface of the rear end of the crane arm 3. An elevator 15 having a telescopic structure that is vertically expandable and contractible is interposed between the support frame 26 and the upper swivel 1, and the upper swivel 1 is supported by the telescopic operation of the elevator 15. 26.

According to the crane apparatus 10 described above, the rope 4r drawn out from the winch 4 is wound around the sheave 3s in a state where the upper swivel 1 is appropriately raised by the elevator 15 and the crane arm 3 is appropriately raised and lowered. It can be hung from the front end of the crane arm 3 while hanging. Then, as shown in FIG. 2, the above-described power distribution equipment 31 is attached to a hook 4f attached to the lower end of the rope 4r.
To wind up the winch 4 so that the power distribution equipment 31 can be lifted in front of the cockpit 27 and the manipulator arm 28 (near the tip of the boom 23).

The lifting operation of the crane arm 3 with respect to the upper swivel 1 in the crane apparatus 10 is as follows.
It is driven by the expansion and contraction operation of the arm raising and lowering cylinder 5.
The side surface of the cylinder tube 5t of the arm up-and-down cylinder 5 at the axially intermediate portion is pivotally attached to the rear end of the pivotally mounted side plate 3c so as to be vertically swingable. On the other hand, the front end of the piston rod 51 of the arm up-and-down cylinder 5 is pivotally attached to the upper rear portion of the upper turntable 1 (above the up-and-down pivotal connection portion 3a) so as to be vertically swingable. That is, the arm up-and-down cylinder 5 is arranged behind the up-and-down pivot attachment portion 3 a and below the crane arm 3. Further, the upper swivel 1, the pivotal side plate 3c, and the arm up / down cylinder 5 constitute an up / down drive link for raising / lowering the crane arm 3 when the arm up / down cylinder 5 is extended. In addition, the crane arm 3 is moved up and down by the arm up and down cylinder 5 being contracted by this link.

In this manner, the up-and-down operation of the crane arm 3 is performed by the extension operation of the arm up-and-down cylinder 5, so that the up-and-down operation is performed by the contraction operation of the up-and-down cylinder 5 (existence of the piston rod). As a result, the pressure receiving area of the piston is reduced, so that the piston diameter needs to be increased. In addition, by disposing the arm up / down cylinder 5 as described above, as shown in FIG. 1, in a state where the crane arm 3 extends over the electric wire 32 on the near side (close to the crane device 10), The electric wire 32 is inserted deep into the space (“futo”) F between the crane arm 3 and the upper swivel 1, and the front end of the crane arm 3 is far from the electric wire 32 (a distance approximately equal to the arm length). ) It is possible to reach a remote position.

Further, in the aerial work vehicle 20, when the boom 23 and the like are stored in the vehicle body 21, the tip of the boom 23 is lowered toward the rear of the vehicle body 21 as shown by a chain line in FIG. At the same time, it is necessary to fold the manipulator arm 28 and raise the crane arm 3 at most so that it does not protrude from the rear end of the vehicle body 21.
At this time, when the arm-lifting cylinder is disposed in the above-mentioned "protruding portion" F as in the related art, it is necessary to increase the stroke of the arm-lifting cylinder, as can be understood by referring to the boom-lifting cylinder 25. In addition, there is a problem that the arm raising / lowering cylinder is enlarged. However, according to the crane apparatus 10, such a problem does not occur.

[0014]

[Effects of the Invention] As described above, in the crane device for working at heights according to the present invention, the arm hoist cylinder mounted between the crane arm and the upper base is located rearward of the hoisting pivoting portion of the crane arm with respect to the upper base. Installed.
Therefore, there is no obstacle in the space between the crane arm and the upper base extending beyond the obstacle. With such an arrangement of the arm up / down cylinder, the front end of the crane arm can be made farther from the obstacle by a distance close to the arm length of the crane arm, and the workability of the crane device can be improved. Further, by configuring the link for raising and lowering the crane arm to perform the raising and lowering operation of the crane arm by the extension operation of the arm raising and lowering cylinder, the arm raising and lowering operation is performed as compared with the case of performing the raising and lowering operation by the contraction operation of the arm raising and lowering cylinder. The cylinder can be made compact.

[Brief description of the drawings]

FIG. 1 is a side view of a crane device for working at heights according to the present invention.

FIG. 2 is a side view of an aerial work vehicle equipped with the crane device. DESCRIPTION OF SYMBOLS 1 Upper swivel base 3 Crane arm 3a Raising / lowering pivot part 4 Winch 5 Arm raising / lowering cylinder 26 Support frame 32 Electric wire

Claims (2)

(57) [Scope of request for utility model registration] 1. A crane arm pivotally mounted on an upper base attached to the tip of a boom which can be raised and lowered, and
An arm raising / lowering cylinder attached between the crane arm and the upper base to cause the crane arm to perform a raising / lowering operation with respect to the upper base, and an object suspended from a front end of the crane arm. A crane device for working at heights that can be lifted to near the tip of the boom, wherein the arm hoisting cylinder is arranged behind a hoisting pivotal connection between the crane arm and the upper base. And crane equipment for work at height. 2. The crane arm according to claim 1, further comprising an arm raising / lowering cylinder disposed rearward of a part of the crane arm on the upper base. The crane device for working at heights according to claim 1, wherein a link for driving up and down is configured.