Electromagnetic brake

Abstract

The invention discloses an electromagnetic brake which comprises a magnet yoke and the like. An electromagnetic coil is arranged inside the magnet yoke. A fastening bolt penetrates the magnet yoke and an armature in sequence, and then the fastening bolt is fixedly connected with a brake shoe. The magnet yoke is opposite to the armature. The armature can move relative to the magnet yoke. A reset elastic component is abutted between the armature and the brake shoe; and / or a slope force amplification mechanism is arranged inside the magnet yoke. The magnet yoke directly drives the slope force amplification mechanism. The electromagnetic force of the magnet yoke is amplified by beta times through the slope force amplification mechanism; and / or a groove with a cone-shaped side surface is formed in the end portion, opposite to the armature, of the magnet yoke. Correspondingly, a boss with a cone-shaped side surface is formed in the corresponding end portion, opposite to the magnet yoke, of the armature and matched with the groove; and / or a plurality of electromagnetic coils are arranged, the connection mode of the electromagnetic coils can be converted between the series connection and the parallel connection, conversion of the series connection and the parallel connection of the electromagnetic coils can be achieved through an electromagnetic coils series-parallel connection conversion circuit; and / or a pin-positioning air resistance-buffering device is arranged between the armature and the brake shoe to integrates the pin positioning and air resistance buffering into a whole.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic brake manufacturing, and in particular relates to a block type electromagnetic brake for elevators. Background technique [0002] The existing block type electromagnetic brakes for elevators, the braking gap between the brake shoe and the brake drum is between 0.2 and 0.7 mm, and the brake needs to provide the braking positive force required to effectively ensure the safe braking of the elevator at the maximum gap. At the same time, the brake also needs to ensure that the brake can be opened in time and quickly when the coil is energized. Therefore, the magnetic circuit of the brake needs sufficient magnetic circuit cross-sectional area and magnetomotive force to provide sufficient electromagnetic attraction, so that the brake is large in size and The weight is heavy, the amount of enameled wire is large, and the electric power required to open the brake is large; and because of the small ...

AI Technical Summary

Problems solved by technology

[0002] The existing block type electromagnetic brakes for elevators, the braking gap between the brake shoe and the brake drum is between 0.2 and 0.7 mm, and the brake needs to provide the braking positive force required to effectively ensure the safe braking of the elevator at the maximum gap. At the same time, the brake also needs to ensure that the brake can be opened in time and quickly when the coil is energized. Therefore, the magnetic circuit of the brake needs sufficient magnetic circuit cross-sectional area and magnetomotive force to provide sufficient electromagnetic attraction, so that the brake is large in size and The weight is heavy, the amount of enameled wire is large, and the electric power required to open the brake is large; and because of the small stroke, it is difficult to realize the monitoring of the brake opening state and the wear state of the brake shoe in a stable and reliable way, and it is difficult for the on-site personnel to monitor the wear status of the brake shoe. Evaluate and adjust the brakes in time, so there may be a safety risk of the elevator due to insufficient braking force of the brakes

Due to the requirement of the maximum safe braking positive pressure, the magnetic gap space is as small as 0.2mm to 0.3mm, the amount of copper used is greatly increased, the weight is heavy, and power consumption is consumed after suction, and the heat is serious. Moreover, the monitoring of the state of the electromagnet Difficult; once the brake shoes wear out, the safety factor of the brakes drops significantly, requiring frequent adjustments to avoid the elevator car from falling

In addition, the existing electromagnetic brake requires high machining accuracy and high cost for the guide rod and guide sleeve, and there are many problems such as easy jamming, difficult to pull in, very difficult to adjust, high technical requirements for operators, and inability to guarantee accuracy requirements, etc. Defects; at the same time, the release time is difficult to meet the actual needs; the impact noise during the pull-in and release is large, which affects its own life and serious environmental noise pollution

Images