Braking system for electric chain hoist friction transmission overload protection and operating method of braking system

Abstract

The invention relates to a braking system for the electric chain hoist friction transmission overload protection and an operating method of the braking system. The braking system comprises a motor, a pinion coaxial with the motor and a big gear meshed with the pinion, wherein the big gear drives a chain guiding wheel to drive a chain to operate, and components including a motor connecting sleeve, a friction piece, a motor shaft spring, a sliding piece and a butterfly spring which promote the pinion coaxial with the motor to generate axial force are sequentially arranged on the inner side of the pinion. The system is characterized in that the friction piece is tightly pressed under the elasticity from the motor shaft spring and the butterfly spring; a bolt penetrates into a hollow shaft on the motor shaft extension line on the outer side of the pinion; an adjusting nut is arranged at the end part of the bolt. According to the invention, the adjusting nut is adjusted to push the pinion and the friction piece to enable the sliding piece to slide to further tightly press the motor shaft spring and the butterfly spring, and the sliding piece and the motor connecting sleeve apply pressing force on the friction piece, so that the friction force is generated, and accordingly load is still prevented from freely falling through the braking action from a brake in the situation that the friction piece is broken.

Description

technical field [0001] The invention relates to a DY series electric chain hoist safety clutch overload protection and braking system, in particular to a DY series electric chain hoist friction transmission overload protection braking system and its working method. Bolts are used to pull the motor connection sleeve and sliding parts, and under the elastic force of the butterfly spring, the friction and slip protection function of the electric chain hoist when it is overloaded is realized. Background technique [0002] At present, one of the safety clutches in the field of electric hoist adopts: by pressing two friction plates and directly driving the large gear by friction to realize overload protection, the biggest disadvantage is that the large gear is not directly connected with the brake, so once the friction If the plate fails, the braking effect of the brake cannot prevent the rotation of the large gear and thus cannot prevent the free fall of the load, resulting in an...

AI Technical Summary

Problems solved by technology

[0002] At present, one of the safety clutches in the field of electric hoist adopts: by pressing two friction plates and directly driving the large gear by friction to realize overload protection, the biggest disadvantage is that the large gear is not directly connected with the brake, so once the friction If the plate fails, the braking effect of the brake cannot prevent the rotation of the large gear and thus cannot prevent the free fall of the load, resulting in an accident

The other is: Although the overload protection is also achieved by directly driving the drive pinion through friction, it has the function of preventing the load from falling freely through the braking action of the brake when the friction plate fails, but its axial force is not determined by The flat bearing at the shaft end of the pinion gear bears it, but it is borne by two rotating bearings. Its fatal shortcoming is that the two rotating bearings bear axial force for a long time during high-speed rotation (this force is far greater than that of the bearing) Radial force) will cause wear of the bearing raceway, resulting in axial displacement or failure of the raceway, which will reduce the compression force of the disc spring, resulting in insufficient friction driving force, unable to lift the rated load or damage, resulting in safety accidents

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