A kind of extensible lifting equipment balance weight mechanism

Abstract

The invention relates to the field of hoisting equipment, in particular to an extensible type hoisting equipment counterweight mechanism. The extensible type hoisting equipment counterweight mechanism comprises an outer extending mechanism, an inner extending mechanism and a driving scissors fork assembly. The driving scissors fork assembly is arranged on a balance arm of hoisting equipment, the outer side of the driving scissors fork assembly is connected with the outer extending mechanism, and the inner side of the driving scissors fork assembly is connected with the inner extending mechanism. A counterweight is arranged at the outer end of the outer extending mechanism. The driving scissors fork assembly is driven to open and close through swinging of a hoisting boom of the hoisting equipment. The driving scissors fork assembly opens and closes to drive the outer extending mechanism to stretch out and draw back. The driving scissors fork assembly drives the inner extending mechanism to open and close. According to the extensible type hoisting equipment counterweight mechanism, the horizontal moving distance of the counterweight is substantially increased by means of the space scaling characteristic of an extensible structure, the balance bending moment of the top of a tower body is effectively reduced, the requirements for stability and static rigidity of a tower crane are met, dynamic performance is more outstanding, materials are saved, power dissipation is reduced, and the hoisting weight of the hoisting equipment is substantially increased.

Description

technical field [0001] The invention relates to the field of lifting equipment, in particular to an extensible balancing weight mechanism of the lifting equipment. Background technique [0002] There has been a long history of research on movable counterweights for lifting equipment. Taking tower cranes as an example, in the 1980s, tower cranes appeared in the form of movable counterweights, which used wire ropes to pull counterweights. In 1985 In 2010, Libherr applied a new type of device to the 500HC tower crane to replace the traditional wire rope moving balance weight method. BKT Company even uses the counterweight mobile device on all types of boom tower cranes above 75t.m, which has a lighter structure and is very beneficial to transportation. In 1989, Potain applied a more complex counterweight moving system to the MR300 tower crane. When the boom is raised, the counterweight moves to the tower through the action of the connecting rod. In 1997, Italy's Comedil (Come...

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Problems solved by technology

[0004] 1. The static load moment generated when the jib is luffing can only be offset by 20% by the movable counterweight;

[0005] 2. When the boom is large, the lifting capacity will be greatly lost;

[0006] 3. The mobile counterweight jib tower crane consumes a lot of energy and produces noise;

[0007] 4. The movable counterweight mechanism requires additional inspection and maintenance, which is costly; and the development cost of the movable counterweight is also relatively high

[0015] The disadvantage of this method is that this method is only suitable for the case where the lifting weight does not change much, but in fact the lifting weight is random and the range of value changes is large. The adaptability of the crane is not very good, because the position of the counterweight is too sensitive due to the movement with the pitch angle of the boom

Due to the use of the swing counterweight, the tower crane has been greatly improved in the medium and large lifting capacity, which is obviously better than the tower cranes of the same level, and the power consumption is small, but the moving distance of the mobile counterweight is limited.

[0017] To sum up, there are still many limitations in the application of mobile counterweight tower cranes, and after adopting the mobile counterweight method, it has brought many disadvantages, which has led to the failure of mobile counterweight tower cranes. development and application of

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