A brake is a device that has the function of slowing down, stopping, or maintaining a stopped state of moving parts (or moving machinery). It is a mechanical component that stops or decelerates moving parts in a machine. Commonly known as brakes or brakes. The brake mainly consists of a frame, brake components, and control devices. Some brakes are also equipped with automatic adjustment devices for brake clearance. In order to reduce braking torque and structural size, brakes are usually installed on the high-speed shaft of equipment, but large equipment with high safety requirements (such as mine hoists, elevators, etc.) should be installed on the low-speed shaft near the working part of the equipment.