Multiplication-variable hook device

Abstract

The invention discloses a multiplication-variable hook device, comprising a hook, a fixed pulley bracket, a movable pullet bracket, a first pulley, a second pulley and a third pulley, wherein the hook is fixed on the movable pullet bracket, the first pulley is fixedly connected with the fixed pulley bracket, the second pulley and the third pulley are symmetrically fixed on the movable pullet bracket, and the second pulley, the first pulley and the third pulley are sequentially wound via a raising line. The hook device overcomes the deficiencies in the prior art, has no need of replacing the hook and putting the raising line through again, and can prominently complete multiplication conversion only by raising the multiplication-variable hook device to a top fixed end and then putting a pin through a pin hole of the top fixed end, thus saving a large amount of manpower, materials and time in particular and greatly enhancing efficiency; in addition, due to the installation of an automatic pin-through device and devices fitted therewith, high-altitude operation by workers is totally avoided so as to prevent the occurrence of accidents.

Description

technical field [0001] The invention relates to a hook device of a crane, which belongs to the field of mechanical engineering. Background technique [0002] The hoisting mechanism of the new generation crane adopts the advanced design of DC motor plus DC speed regulation, which can meet the requirements of various working conditions of light load high speed and heavy load low speed, greatly improving the working efficiency of the crane. However, in the prior art, the magnification of the hook device is fixed. In order to adapt to different working conditions, a crane is always equipped with two sets of hook devices with different magnifications to be replaced as required. [0003] The replacement process of the hook is as follows: First, release the hoisting rope from the reel to lower the hook to the ground, loosen the hoisting rope and pull it out from the hook; replace it with another set of hooks, re-thread the hoisting rope, and Fix the end of the hoisting rope on the...

AI Technical Summary

Problems solved by technology

[0004] Therefore, there are following defects in the prior art: since the magnification of the hook device is fixed, it is time-consuming and labor-intensive to replace the hook, which reduces the service efficiency of the equipment

In addition, the work of re-threading the lifting rope is a high-altitude operation, which has certain dangers.

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