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

Abstract

The invention relates to a braking system for friction transmission overload protection of an electric chain hoist and a working method thereof, comprising a motor, a pinion coaxial with the motor, a bull gear meshing with the pinion, and a guide sprocket driven by the bull gear , drive the chain to work, and promote the pinion coaxial with the motor to generate the axial force. The parts are located on the inner side of the pinion, which are the motor shaft spring, the motor connecting sleeve, the friction plate, the sliding part and the butterfly spring in turn; it is characterized in that : the elastic force of the motor shaft spring and the butterfly spring presses the friction plate, the hollow shaft on the extension line of the motor shaft outside the pinion is threaded with a bolt, and the end of the bolt is provided with an adjusting nut. The invention pushes the pinion gear and the friction plate through the adjustment of the adjusting nut to make the sliding part slide and press the motor shaft spring and the butterfly spring, so that the sliding part and the motor connecting sleeve generate a pressing force on the friction plate to generate friction force. In the event of failure, the braking action of the brake can still be used to prevent the load from falling freely.

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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