Dual-pulley-block balance structure, method and crane comprising same

Abstract

The invention discloses a dual-pulley-block balance structure, which comprises a superlift variable-amplitude hoist, an arm head pulley block, a superlift variable-amplitude pulley block, a guiding pulley, a superlift variable-amplitude steel wire rope, a synchronous steel wire rope and a monitoring device, wherein the superlift variable-amplitude steel wire rope is wound out of the superlift variable-amplitude hoist, is wound completely through the arm head pulley block and the superlift variable-amplitude pulley block, is wound back from the inside of an arm frame through the guide pulley, and is connected with the synchronous steel wire rope to form a joint. The invention further discloses a crane, which is provided with any dual-pulley-block balance structure. In a balance method disclosed by the invention, the entire process is simple and reliable; and a synchronous rope of a certain length is arranged, so that the effective rope length of the hoist can be increased, and the using safety of the hoist is improved. The balance structure and the method are suitable for other working occasions on which a plurality of hoists work in a cooperative way.

Description

technical field [0001] The invention relates to the balancing technology of pulley blocks, in particular to a double pulley block balancing structure, a method and a crane including the structure. Background technique [0002] With the continuous increase of the lifting capacity of crawler cranes, the single-arm crawler cranes have gradually been unable to meet the needs. At present, the application of the double-arm system is more and more widely used in cranes with large lifting capacity. The emergence of double booms has brought about the problem of synchronous control of the left and right boom double winches or even more winches. Because if the double winch is not synchronized, it will cause the imbalance of the double pulley block for luffing or hoisting, which will bring side load to the boom system and cause safety hazards in use. [0003] There are two general designs, one is to control the synchronization of the hoists by detecting the rotational speed of the two ...

AI Technical Summary

Problems solved by technology

The accuracy of this control method is low, and the error between the theoretical value and the actual value of the wire rope speed is relatively large. The main reason is that the number of winding layers and the degree of winding tightness of the wire rope on the two winches are different; Wrap the double winches so that even if the winches are not synchronized, the two pulley blocks will maintain balance under stress

However, this method brings great inconvenience to the hoisting out of the rope winding pulley block, and there is no intuitive method to detect that the hoisting is out of sync.

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