JP2541686Y2 - 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. In such a crane device, the crane arm is appropriately raised and lowered, and a rope is hung from the front end of the crane arm, and the rope is wound up by a winch, so that an object (power distribution equipment or the like) attached to the lower end of the rope is wound. ) Can be lifted to the vicinity of the end of the boom, such as in front of the workbench.

By the way, when the above-mentioned electric work is performed using such a crane device, as shown in FIG. 3, electric wires supported in two stages by electric poles 130 due to the mounting position of the object on the electric poles. (Upper wire 132, lower wire 13
3) There is a case where it is necessary to lift the above-mentioned object with the crane arm 103 interrupted in the middle. Further, when the lifting is performed in this manner, for example, the front end of the crane arm 103 is determined based on the vertical distance from the hoisting end (hook) of the rope 104r to the object suspended below the hoisting end. In some cases, it is necessary to change the height of the section (hereinafter referred to as a lifting base point).

[0004]

However, it is difficult to raise and lower the crane arm 103 to change the height of the lifting base point. That is, the crane arm 10
3 is operated when the crane arm 10
It is necessary to take care not only to prevent the upper surface of 3 from interfering with the upper electric wire 132 but also to prevent the rope 104r, which is lifting the object, from moving horizontally and interfering with the lower electric wire 133. It is a heavy burden.

[0005] The present invention has been made in view of such circumstances, and it is possible to easily raise and lower a lifting base point with a crane arm inserted between electric wires supported in two stages. It is an object of the present invention to provide a crane device for working at heights.

[0006]

In order to achieve the above object, in the crane apparatus for working at height according to the present invention, an upper base on which a crane arm is pivoted so as to be able to move up and down is attached to the end of a boom by a lifting means. In contrast, it can be raised and lowered vertically.

[0007]

With such a crane device for working at heights, the lifting / lowering means is operated while the crane arm is interrupted between obstacles (wires) arranged in the upper and lower stages.
The height of the lifting base point can be changed without moving the crane arm vertically, that is, without moving the rope horizontally to the obstacle side. Thus, the operator only needs to pay attention to the interference between the upper surface of the crane arm and the obstacle above.

[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.

In the aerial work vehicle 20 constructed as described above, the operator in the cockpit 27 operates the lower swivel 22 and the boom 23 to move to an arbitrary height through an operation from the inside. In addition, by remotely controlling the operation of the manipulator arms 28, 28, the work of attaching the power distribution equipment 31 to the utility pole 30 can be performed safely without directly touching the power distribution equipment 31 or the live wires 32, 33. it can.

Further, at the front of the support frame 26, the above-mentioned crane device 10 for working at height 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 is pivotally mounted on an upper swivel (upper base) 1 which is rotatable with respect to. 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.

Here, the upper swivel 1 of the crane arm 3
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 located at the rear upper side of the upper swivel 1 (above the up-and-down pivot attachment portion 3a).
It is pivoted up and down freely. Thus, the crane arm 3 can be raised and lowered by operating the arm raising and lowering cylinder 5 to extend, and the crane arm 3 can be raised and lowered by operating the arm raising and lowering cylinder 5 to contract.

The crane arm 3 is configured to be telescopically expandable and contractable, and the length of the arm is adjusted by the expansion and contraction (the upper revolving base 1 in the entire length of the crane arm 3).
(The length in front of the undulating pivot 3a) can be adjusted. Further, a sheave 3s is rotatably attached to the front end of the crane arm 3. A winch 4 is attached to the upper surface of the rear end of the crane arm 3.

According to the crane device 10 described above, the rope 4r drawn out from the winch 4 can be hung around the sheave 3s and hung down from the front end of the crane arm 3 with the crane arm 3 appropriately raised and lowered. it can. Then, as shown in FIG. 2, the power distribution facility 31 is hooked on the hook 4 f attached to the lower end of the rope 4 r and the winch 4 is wound up to operate the power distribution facility 31 with the cockpit 27 and the manipulator arm 28. It can be lifted forward (near the tip of the boom 23).

Incidentally, such a lifting operation is described in FIG.
As shown in (2), there is a case where the operation is performed in a state of being interrupted between electric wires (an upper electric wire 32 and a lower electric wire 33) supported in two steps by a power pole 30. In such a case, the elevator 15 is provided between the support frame 26 and the upper turntable 1 so that the lifting operation can be performed smoothly. The elevator 15 includes an outer post 15a attached to the upper surface of the front end of the support frame 26, and an inner post 15b fitted to the outer post 15a so as to be vertically expandable and contractible. The inner post 15b is formed of an insulating material such as fiber reinforced plastic for maintaining electrical insulation between the crane device 10 and the support frame 26 and the cockpit 27. Further, the outer post 15a and the inner post 15b have a built-in lifting cylinder 15c for extending and contracting the inner post 15b with respect to the outer post 15a. The upper swivel 1 is attached to the upper end of the inner post 15b (swingably), and is moved up and down with respect to the support frame 26 by expansion and contraction of the inner post 15b.

By providing such a lift 15, as shown in FIG. 1, it is possible to raise and lower the lifting base point which is the front end of the crane arm 3 while moving the crane arm 3 up and down in parallel. For this reason, it is possible to avoid a situation in which the rope 4r erroneously interferes with the lower electric wire 33 as in the case where the lifting base point is raised by the raising / lowering operation of the crane arm 3. Therefore, the operator need only take care that the upper surface of the crane arm 3 does not interfere with the upper electric wire 32,
The lifting base point can be easily raised. The cockpit 27 and the manipulator arm 28
The crane device 10 can be vertically raised and lowered independently while maintaining the height at a predetermined height.
Workability can be improved.

[0016]

As described above, by using the crane device for working at heights according to the present invention, the front end of the crane arm, that is, the lifting base point, is vertically moved by the operation of the lifting / lowering means without depending on the up / down operation of the crane arm. Can be raised and lowered. For this reason, for example, when raising and lowering the lifting base with the crane arm interposed between obstacles arranged in two stages above and below, the worker only has to pay attention to the interference between the crane arm and the obstacle above it. And the burden on the worker can be reduced.

[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.

FIG. 3 is a side view of a conventional crane device. DESCRIPTION OF SYMBOLS 1 Upper swivel 3,103 Crane arm 4 Winch 5 Arm raising / lowering cylinder 26 Support frame 32,33,132,133 Electric wire

Continuation of the front page (72) Inventor Yukio Kano 1-1, Takane, Sakaemachi, Toyoake-shi, Aichi Chubu Electric Power Co., Tomei Substation A302 (56) References Japanese Utility Model No. 3-89093 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. An object comprising: an upper base attached to a tip of an up-and-down boom; and a crane arm attached to the upper base so as to be able to undulate. What is claimed is: 1. A crane device for working at height which can lift an object near a tip of the boom, comprising a lifting means for vertically lifting and lowering the upper base with respect to the tip of the boom. Work crane equipment.