Working principle of single-acting cylinder
The single-acting cylinder has only one chamber that can input compressed air to achieve movement in one direction. Its piston rod can only be pushed back with the help of external force;usually with the help of spring force, diaphragm tension, gravity, etc.
The characteristics of single-acting cylinders are:
1. Only one end enters (exhausts) air, with simple structure and low air consumption.
2. Use spring force or diaphragm force to reset. Part of the compressed air energy is used to overcome the spring force or diaphragm tension, thus reducing the force output of the piston rod.
3. Install a spring in the cylinder. Diaphragms, etc., generally have a shorter stroke;compared with a double-acting cylinder of the same volume, the effective stroke is smaller.
4. The tension of the cylinder return spring and diaphragm changes with the deformation, so the output force of the piston rod changes during the travel process.
Due to the above characteristics, single-acting piston cylinders are mostly used in short-stroke situations where thrust and movement speed are not required, such as air lifting, positioning and clamping devices. This is not the case with the action plunger cylinder, which can be used in long stroke and high load applications.
Single action< strong>CylinderPneumatic actuatorHow it works
When the air source pressure enters the middle cavity between the two pistons of the single-acting cylinder from the air port (2), the two pistons separate and move towardCylinder moves in both directions, forcing the springs at both ends Compression, the air in the air chambers at both ends is discharged through the air port (4), and at the same time, the two piston racks synchronously drive the output shaft (gear) to rotate counterclockwise.
After the air source pressure is reversed through the solenoid valve, the two pistons of the single-acting cylinder move toward the middle direction under the elastic force of the spring, and the air in the middle air chamber flows from the air port (2) Discharge, and simultaneously make the two piston racks synchronously drive the output shaft (gear) to rotate clockwise. (If the piston is installed in the opposite direction, the output shaft will rotate in the opposite direction when the spring returns, which is single-acting reverse rotation)
Single-acting cylinder symbol
Mainly include four types: single piston rod cylinder, single piston rod cylinder (with spring return), plunger cylinder and telescopic cylinder. The representation of component graphic symbols is introduced. The method is divided into two types: detailed symbols and simplified symbols.
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