Pulley mechanism of a hoisting machine

Abstract

A pulley mechanism for a hoisting machine, characterized in that it includes a fixed pulley set mounted on the boom head through a fixed pulley bracket and corresponding connecting pieces, a first movable pulley set mounted on the first movable pulley bracket, and a fixed pulley block mounted on the first movable pulley bracket The second movable pulley block and the suspension hook on the second movable pulley bracket; the fixed pulley block is composed of two left and right fixed pulleys arranged on the upper part of the fixed pulley bracket and a fixed pulley block at the bottom, and the first movable pulley block is hoisted on the Below the fixed pulley block, the second movable pulley bracket equipped with the second movable pulley block and the suspension hook is combined with the lower end of the first movable pulley bracket through a detachable connecting piece.

Description

technical field [0001] The invention relates to a pulley mechanism of a hoisting machine, in particular to a device for changing the magnification of the pulley mechanism of a large hoisting machine during work. Background technique [0002] In the design of the crane, it is very important to determine the ratio of the pulley block reasonably. Generally, it is hoped to achieve low speed for heavy load and high speed for light load. According to this design principle, a large magnification is generally used when lifting a large lifting weight, which can avoid the use of too thick wire ropes and reduce the lifting speed correspondingly. But when the same mechanism lifts medium and small lifting weights, if the pulley ratio is not changed and the lifting speed is still very low, the effective power of this mechanism cannot be brought into play, and the service efficiency is too low. At present, the maximum lifting capacity of large-scale hoisting machinery can reach hundreds o...

AI Technical Summary

Problems solved by technology

[0003] The easiest way to change the magnification in the existing technology is to manually re-thread the rope, but at an altitude of more than 100 meters, it is difficult or even impossible to manually re-thread the rope

Moreover, the hoisting of large parts in the project is not in the same period, and the large and small parts are often interspersed. The magnification needs to be changed frequently, and it is not advisable to rely solely on manual stringing

In addition, the magnification of large-scale hoisting machinery is very large, so its rope winding system is also very complicated. For such a complicated rope winding system, it is even more difficult to easily and quickly change the magnification. The problem of changing magnification in

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