JP2626366B2 - Crane lifting equipment - 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 lifting device suitable for moving a load from the outside of a building to a place where the inside has entered.

[0002]

2. Description of the Related Art Generally, PC curtain walls are used on the outer walls of buildings such as high-rise buildings. A tower crane is used to attach this curtain wall as an outer wall.However, the curtain wall is suspended from a hook block of the crane via a chain block or the like for drawing and attaching to the building side, and the chain block is attached to the crane. The mounting position was finely adjusted by adjustment. However, this operation was inefficient and had safety issues.

[0003] Therefore, when a suspended load is taken into a place where a suspended load is entered by using a tower crane or when the position of the suspended load is to be finely adjusted, a balanced beam is conventionally used.

This balanced beam has a balance weight disposed at one end of a horizontal beam and a suspended load disposed at the other end. The balanced beam is maintained horizontally by the product of the weight of the two and the distance to the fulcrum, and the beam is maintained exclusively. The suspended load can be moved from the outer wall side toward the interior of the building by the distance from the fulcrum to the suspended load.

[0005]

However, in this case, if the weight of the balance weight and the weight of the suspended load are not perfectly balanced, the balance is lost, and there is a problem in safety.

In order to eliminate this kind of defect, for example, as shown in Japanese Utility Model Application Laid-Open No. 19107/1985, a structure in which the position of a balance weight moves in accordance with a change in the load of a suspended load to maintain an equilibrium state is known. Although it has been developed, the movement is still dependent on the movement of the crane, making it difficult to operate the crane when making fine adjustments during movement.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a crane which has higher safety when suspending a suspended load and can easily perform a fine adjustment operation of a position at a final delivery point. A hoisting device is provided.

[0008]

In order to achieve the above object, the present invention provides a fulcrum block suspended from a hook block of a crane, a pivotally rotatable base end of the fulcrum block, and a distal end. A suspension arm provided with a suspension portion for a suspended load, a balance arm pivotally supported at a base end by the fulcrum block, and arranged at a position symmetrical to the suspension arm, and a lower portion of the fulcrum block A drive cylinder suspended at the center, a pair of link levers having one end pivotally supported at the tip of a plunger of the drive cylinder and the other end connected to each of the arms, and a balance suspended at the tip of the balance arm With weights.

[0009]

In the lifting device for a crane according to the present invention having the above-described structure, the opening angle of each arm is adjusted by the forward / backward movement of the plunger of the drive cylinder, and the horizontal position of the suspended load is adjusted according to the opening angle. Change. By closing each arm in the unloaded state, the balance weight moves near the center of gravity of the device.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In the figure, a hook block 1 is arranged at a lower end of a hanging wire of a tower crane (not shown). The lifting device 2 includes a fulcrum block 3 suspended from the hook block 1, a lifting arm 5 and a balance arm 6 pivotally supported by the fulcrum block 3 via a fulcrum pin 4, and the fulcrum block. One end is connected via a pin 9 to a drive hydraulic cylinder 7 suspended at the center of the lower part of the lower part 3 and a plunger 8 protruding from the lower part of the hydraulic cylinder 7 so as to be able to advance and retreat. And a pair of link levers 11 and 12 connected through a link 10.
The arms 5 and 6 open and close in a divider shape.

A hook portion 13 for suspending the suspended load W1 is provided at the end of the suspended load arm 5. Also, the length of the balance arm 6 is longer than the length of the suspended load arm 5,
A balance weight W2 is suspended from the tip.

In the above construction, the load balance of the lifting device 2 is balanced by the horizontal projection of the lengths L1 and L2 of the arms 5 and 6 and the moment by the product of each of the suspended load W1 and the balance weight W2. Is determined.

The state in which the load balance is balanced can be confirmed by keeping the hydraulic cylinder 7 in a vertical position, and an inclinometer 14 is arranged in the hydraulic cylinder 7 for this confirmation. Accordingly, the load can be adjusted while reading the data of the inclinometer 14, and after the adjustment, the crane can be lifted in a stable state.

By moving the plunger 8 forward and backward, the balance is broken, and the arms 5 and 6 expand and contract to the corresponding opening angles, so that the position of the suspended load W1 at the final transfer point can be finely adjusted. Will be.

After the delivery of the suspended load W1, the hydraulic cylinder 7 is driven to close the arms 5, 6 as indicated by the imaginary lines in the figure.
Since the balance weight w2 moves to the vicinity of the center of gravity of the device 2, the device 2 is hung on the hook block 1 in a stable posture even in an empty state.

FIG. 2 shows a second embodiment of the present invention. In addition, the parts other than the main part in the figure are the same as those of the first embodiment, so only the main part will be described, and other parts will be omitted. In the figure, a plurality of load adjusting holes 6a are opened in a line at the tip side of the balance arm 6 along the longitudinal direction thereof, and the balance weight W2 can be mounted by selecting each of the load adjusting holes 6a. . This embodiment is suitable for the case where the load of the suspended load W1 to be suspended frequently changes.

FIG. 3 shows a third embodiment of the present invention. In the figure, an auxiliary arm 20 movable along the leading end of the suspended load arm 5 is provided, and a suspended hook portion 13 is provided at the distal end of the auxiliary arm 20.

An auxiliary hydraulic cylinder 21 is fixedly disposed parallel to the outside of the lifting arm 5. The tip of a plunger 22 is connected to the auxiliary arm 20, and the auxiliary arm 20 is driven by the auxiliary hydraulic cylinder 21. 5 to make it possible to change the lever ratio of the suspended load arm 5 to the balance arm 6. In this embodiment, the balance between the suspended load W1 and the balance weight W2 can be adjusted by the auxiliary hydraulic cylinder 21, and the adjustment during the lateral movement of the lifting device 2 can be performed by the hydraulic cylinder 7. The same effect can be obtained by providing an auxiliary arm having this type of mechanism on the balance arm 6 side.

[0019]

As described in detail in the above embodiments, the crane lifting device according to the present invention has:
Since the opening angle of each arm is adjusted by the reciprocating operation of the plunger of the drive cylinder and the lateral position is changed, fine adjustment at the final delivery point is extremely easy as compared with the case where the arm is moved to the final position by operating the crane.

When each arm is closed, the balance weight moves to the vicinity of the center of gravity of the apparatus, so that a stable hanging posture can be maintained even in an empty state.

[Brief description of the drawings]

FIG. 1 is a front view of a crane lifting device according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view according to a second embodiment of the present invention.

FIG. 3 is a partially enlarged view according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hook block 2 Lifting device 3 Support block 5 Lifting arm 6 Balance arm 7 Hydraulic cylinder for driving 8 Plunger 11, 12 Link lever 13 Hook part (hanging lower part) W1 Hanging load W2 Balance weight

Claims (1)

(57) [Claims] 1. A fulcrum block suspended from a hook block of a crane, a lifting arm pivotally supported at a base end of the fulcrum block and having a hanging portion for hanging a load at a tip thereof, A balance arm pivotally supported at a base end by a fulcrum block and arranged symmetrically with the load arm; a drive cylinder suspended at the lower center of the fulcrum block; and a plunger tip of the drive cylinder A pair of link levers, one end of which is pivotally supported and the other end of which is connected to each of the arms, and a balance weight suspended from the tip of the balance arm. .