Safety protection device of electric hoist

Abstract

The invention discloses a safety protection device of an electric hoist. The electric hoist (9) comprises a motor (3), a speed reducer, a steel wire rope reel (1), a steel wire rope (2), a pulley, a lifting hook (5) and a control loop, wherein a fender rod (4) is respectively arranged between the steel wire rope reel (1) with a half opening at the side face and the motor (3) as well as between the steel wire rope reel (1) and the speed reducer; and the fender rods (4) are arranged at the outer side of the half opening of the steel wire rope reel (1) and fixedly connected with the steel wire rope reel (1). By adopting the technical scheme and by adopting methods for changing the original electrical control circuit and manufacturing mechanical protection, the defects on the protection of the traditional electric hoist are solved, the safety performance of the electronic hoist is greatly improved, the processing complexity is reduced, and therefore the influence on time is reduced, and the safe, portable and low-cost safety protection requirements are achieved.

Description

technical field [0001] The invention belongs to the technical field of hoisting and transporting machinery, in particular, the invention relates to a safety protection device for an electric hoist. Background technique [0002] In the prior art, the general electric hoist adopts the protection method of lifting the top limit to prevent the electric hoist from lifting the top. Existing ceiling lift limit is mechanical limit, used in conjunction with rope guide. This protection method has the following disadvantages: [0003] In actual work, the rope guide is often damaged, which will cause the lifting limit to fail, fail to provide safety protection, and easily cause the hook to rise and fall to hurt people. E.g: [0004] The electric hoist is pulled and hung obliquely, causing the wire rope guide to be damaged and then detached. Squeeze and fall, which may cause casualties; [0005] If the lifting limit is only connected to the rising contactor, the wire rope will be re...

AI Technical Summary

Problems solved by technology

[0004] The electric hoist is pulled and hung obliquely, causing the wire rope guide to be damaged and then detached. Squeeze and fall, which may cause casualties;

[0005] If the lifting limit is only connected to the rising contactor, the wire rope will be rewound after landing. The rising at this time is actually falling in terms of control. Falling and hurting people; Generally, the hook falls to the ground and then rolls back due to the following three points: 1. The control switch is broken, and the descent is inseparable; 2. The descending button is always pressed due to improper operation; combine

[0006] The lifting limit is connected to the main contact, the hook rises and hits the lifting limit, and the vehicle is powered off. At this time, to resume use, the limit must be closed first, so that the hook falls to a point where it cannot touch the lifting limit. place, then restore the limit and raise the top once, it is extremely cumbersome and time-consuming to restore

[0007] Due to the damage of the rope guide of the electric hoist and the wrong groove of the wire rope, major safety accidents and equipment accidents caused by the lifting of the hook head and the cracking and falling of the motor and reducer

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