A brake is a device that has the function of making moving parts (or moving machinery) slow down, stop or keep the stop state. A mechanical part that causes a moving part in a machine to stop or slow down. Commonly known as brake, brake. Brake is mainly composed of frame, brake parts and control devices. Some brakes are also equipped with automatic adjusting devices for brake clearance. In order to reduce the braking torque and structural size, the brake is usually installed on the high-speed shaft of the equipment, but the large equipment (such as mine hoist, elevator, etc.) with higher safety requirements should be installed on the low-speed shaft close to the working part of the equipment.

Brake due to the development of modern industrial machinery and the emergence of a variety of new structural types, including disc brake, magnetic powder brake and electromagnetic brake is the most widely used. The specific classification is as follows:

1, friction brake, it can be divided into the disc brake, outside block brake, inner bulge shoe brake, band brake, comprehensive band brake, double shoe brake shoe brake, simple band brake, single disc brakes, brake disc, fixed clamp brakes, floating brake, etc.

2, non-friction brake, it can be divided into magnetic powder brake, magnetic eddy current brake, water eddy current brake.