What is the principle of spring brake air chamber?

Working principle of double diaphragm spring brake air chamber
During service braking, compressed air enters the cavity a through 11 ports, acts on the diaphragm b, and compresses the spring c, the push rod d is pushed out, the pressure acting on the diaphragm acts on the adjusting arm through the connecting rod, and generates Braking torque.
During parking and emergency braking, the manual control valve causes the compressed air in the E cavity to be completely or partially released through the 12 ports, and the energy storage spring g also completely or partially releases energy through the diaphragm f, the push rod kd and the brake The adjusting arm acts on the wheel brake.
When driving normally, put the loosening bolt h in the hole A and tighten it with a nut. When the machine needs to be loosened, put the loosening bolt into the tray i, rotate 90 degrees, and then unscrew the loosening bolt to realize manual connection when there is no compressed air. In addition to braking.
Working principle of combined spring brake air chamber
During service braking, the compressed air from the foot brake valve enters the A cavity through 11 ports and acts on the diaphragm, and the compression spring C pushes the piston e out, and the force acting on the diaphragm d acts on the diaphragm b through the push rod b. The brake adjustment arm produces a braking torque on the wheels.
During parking braking and emergency braking, the hand brake valve makes the compressed air in the B cavity completely or partially release its energy through the 12 ports, and generates a braking torque on the wheels through the piston e, push rod b and brake adjustment arm .
Unscrew the loosening bolt g ​​to loosen the mechanical part of the parking brake, which is used to manually remove the brake without compressed air.