Lifting hook structure of tower crane

Abstract

The invention discloses a lifting hook structure of a tower crane. The lifting hook structure comprises an upper pulley block (1), a lower pulley block (2), a multiplying power pin shaft (3) and a shaft sleeve (5), wherein corresponding connection holes are formed in the upper pulley block (1) and the lower pulley block (2); the multiplying power pin shaft is provided with a split pin hole in a shaft shoulder; a corresponding slit pin hole is formed in the shaft sleeve; the shaft sleeve is fixed on the outer side of the upper pulley block or the lower pulley block; the multiplying power pin shaft penetrates into the connection holes of the upper pulley block and the lower pulley block from one side of the shaft sleeve when being installed; and when the slit pin hole of the multiplying power pin shaft is concentric with the slit pin hole in the shaft sleeve, a slit pin (4) is inserted and fixed. According to the lifting hook structure of the tower crane disclosed by the invention, by a structural form of fixing movement of the pin shaft in two directions by virtue of the slit pin, transformation of multiplying power can be achieved by an operator on only one side of the lifting hook; the lifting hook structure is simple in structural form, convenient to produce and process, and convenient to install and dismantle.

Description

technical field [0001] The invention relates to a tower crane, in particular to a tower crane hook structure. Background technique [0002] Existing tower cranes often adopt the method of removing the magnification pin on the trolley basket to realize the change of lifting magnification. When the pulley block is fixed on the trolley, the upper pulley block becomes a fixed pulley, and there are two steel wire ropes on the working lower hook. At this time, the hook has a double ratio. When the upper pulley block and the lower pulley block are connected with a multiplier pin, the entire hook There are four steel wire ropes working on it, which is a quadruple ratio. In medium and large tower cranes, the size of the hook will be very large, and the distance between the person standing on the trolley basket and the override pin will be very far, and it is difficult to have enough space to easily remove the override pin. [0003] There are usually two types of tower crane hook st...

AI Technical Summary

Problems solved by technology

When the width of the upper and lower pulleys is very large, people on the trolley may not be able to reach the other side of the hook. At this time, the override pin cannot be installed or disassembled, or although it can be installed, there are certain safety hazards.

[0007] 2. It is impossible to prevent the rotation of the shaft. Since the shaft is not fixed in the circumferential direction, the override pin can rotate freely

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