What is the working principle of air brake?

When the driver places the brake valve in the release position, the compressed air from the main air cylinder enters the main brake pipe, enters the three-way valve through the brake branch pipe, pushes the driving piston and the slide valve to move to the right, opens the inflation ditch, and makes the compressed air enter the auxiliary air cylinder through the inflation ditch until the air pressure in the auxiliary air cylinder is equal to that in the main brake pipe.

When the main piston of the three-way valve moves, the slide valve connected with it also moves to the right, so that the compressed air in the brake cylinder is discharged through the exhaust port below the slide valve, so that the brake cylinder piston is pushed back to its original position by the elastic force of the spring, and the brake shoe is disengaged from the wheel.

Extended data:

The new air brake has the advantages of fast braking action, high sensitivity and strong braking force, which can shorten the braking distance and improve the running speed of the train, whether in common braking or emergency braking. The braking force of vehicles before and after the train is relatively consistent; Smooth braking and convenient operation to ensure driving safety; Convenient maintenance and the like.

Vehicles equipped with new brakes can be mixed with vehicles equipped with ordinary brakes.

Braking principle When the driver moves the brake valve to the braking position, the compressed air in the brake pipe is exhausted and braked.

Reference materials? Baidu encyclopedia-air brake