Lifting hook with gravity lever type anti-unhooking device

Abstract

The invention relates to the field of special mechanical equipment, in particular to a lifting hook with a gravity lever type anti-unhooking device. The lifting hook comprises a hook body (1) and a hook handle (2), wherein an anti-unhooking device is mounted on a joint of the hook body (1) and the hook handle (2). According to the lifting hook, by adopting the gravity lever principle, two iron plates (one short plate and one long plate) are fixed by bolts and also can be welded together; the short plate (namely an anti-dropping plate) is closed with the lifting hook by virtue of self-gravity of the long rod; and the anti-dropping plate and the lifting hook are always closed under a normal condition, so that only is gravity difference between the long rod and the anti-dropping plate required to overcome in the counter-clockwise direction in an open state. Force of opening the anti-dropping plate is far lower than twisting force, overcome by an existing lifting hook with an anti-unhooking device, of a spring, so that the force of opening the anti-dropping plate does not need to artificially overcome. The lifting hook is reasonable in design and simple in structure, so that the lifting hook with the anti-unhooking device is relatively practical and safe, and has good market application prospect.

Description

technical field [0001] The invention relates to the field of special equipment machinery, in particular to a lifting hook with a gravity lever type anti-decoupling device. Background technique [0002] At present, the shortcomings of the common anti-decoupling device applied to the lifting hook: [0003] (1) When taking out the rigging, it is necessary to manually overcome the torsion of the spring, especially the large-tonnage hook, which is laborious, so it is very inconvenient to operate, which affects the production efficiency, and the operator is unwilling to use it. [0004] (2) Most of the common anti-decoupling devices are stamped from 0.5-0.6mm iron plate, which is not strong enough. If the strength is forcibly increased, it will not match the spring. Due to the complex working environment of the crane, the hook will often collide, squeeze, etc., and the anti-decoupling device is not strong enough, and it is easy to deform and fail. [0005] (3) From the perspect...

AI Technical Summary

Problems solved by technology

[0003] (1) When taking out the rigging, it is necessary to manually overcome the torsion of the spring, especially the large-tonnage hook, which is laborious, so it is very inconvenient to operate, which affects the production efficiency, and the operator is unwilling to use it.

[0004] (2) Ordinary anti-decoupling devices are mostly stamped with 0.5-0.6mm iron plate, which is not strong enough

If the strength is forcibly increased, it cannot match the spring

Due to the complex working environment of the crane, the hook will often collide, squeeze, etc., and the anti-decoupling device is not strong enough, and it is easy to deform and fail

[0005] (3) From the perspective of the installation structure, the width of the fixed lug on the hook is too narrow, and the anti-decoupling device is fixed by the two side plates. After being fixed, the anti-decoupling device can move left and right, which is easy to bend the connecting bolt and damage the return spring.

At the same time, ordinary bolts are used for the connection, and the nuts cannot be pre-tightened, so that the nuts are easy to loosen and fall off.

[0006] Ordinary anti-decoupling devices have the following problems in use: first, they are inconvenient to use and are often dismantled in practical applications; second, they are not strong enough and prone to deformation; third, their installation structure is unreasonable, and they are easy to be damaged and fall off

Because of its low use efficiency and its fragility, sometimes it will be damaged within 2 or 3 days, so operators are often too lazy to install it after damage

[0007] From 2013 to 2014, a total of 1,702 cranes were inspected, and 1,068 devices were found to have problems with the hook anti-decoupling devices, accounting for about 63% of the total number of cranes inspected. The pass rate of the hook anti-decoupling devices was low

The problem is mainly manifested as: the anti-decoupling device of the lifting equipment hook loses its function, some are seriously deformed, some return springs are damaged, and some hooks even lose the anti-decoupling device and lose the function of anti-decoupling protection

Images