Action principle of air cushion cylinder

When the piston moves to the right, the right buffer sleeve contacts the right buffer sealing ring, forming a closed air chamber on the right side of the piston, which is called the buffer chamber. The gas in the buffer chamber can only be discharged through the buffer valve. When the opening of the buffer valve is very small, the exhaust of the buffer cavity is very small, and the piston continues to move to the right, so the gas in the buffer cavity is in adiabatic compression state, which makes the pressure in the cavity rise rapidly. This pressure produces a reaction force to the piston, so that the piston slows down until it stops, avoiding or reducing the impact of the piston on the cylinder head and achieving the purpose of buffering. Adjusting the opening of the buffer valve can change the buffer capacity, so the cylinder with the buffer valve is called the adjustable buffer cylinder. When the buffer valve rotates clockwise, the buffering capacity is enhanced, and when it rotates counterclockwise, the buffering capacity is weakened. The throttle valve of the buffer valve is too large. Before the piston approaches the end of the stroke, it may bounce. Please pay attention.

When the piston moves to the left in the opposite direction, the buffer sealing ring acts like a one-way valve, and the air pressure presses the lip of the buffer sealing ring, allowing compressed air to flow to the piston and pushing the piston back. Because the buffer sealing ring has throttling function, in order to make the piston return quickly, the buffer stroke should not be too long.