Pneumatic cylinder converts air pressure energy into me […]
Pneumatic cylinder converts air pressure energy into mechanical energy and performs linear reciprocating motion (or swing motion)
Pneumatic actuator.Pneumatic cylinder is a pneumatic actuator that converts pneumatic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has a simple structure and reliable work. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable. Therefore, it is widely used in various mechanical pneumatic systems. The output force of the pneumatic cylinder is proportional to the effective area of the piston and the pressure difference between its two sides; the pneumatic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The buffer device and the exhaust device depend on the specific application, and other devices are indispensable.
According to the structure of commonly used pneumatic cylinders, it can be divided into four types:
The single piston rod pneumatic cylinder has a piston rod at only one end. As shown in the figure is a single-piston pneumatic cylinder. Both the inlet and outlet ports A and B at both ends can pass pressure oil or return oil to achieve two-way movement, so it is called a double-acting cylinder.
(1) The plunger pneumatic cylinder is a single-acting pneumatic cylinder, which can only move in one direction by air pressure, and the return stroke of the plunger depends on other external forces or the weight of the plunger;
(2) The plunger is only supported by the cylinder liner without contacting the cylinder liner, so that the cylinder liner is very easy to process, so it is suitable for long-stroke pneumatic cylinders;
(3) The plunger is always under pressure during operation, so it must have sufficient rigidity;
(4) The weight of the plunger is often large, and it is easy to sag due to its own weight when placed horizontally, causing unilateral wear of the seal and the guide, so its vertical use is more advantageous.
The telescopic pneumatic cylinder has two or multi-stage pistons. The sequence of the extension of the pistons in the telescopic pneumatic cylinder is from large to small, while the order of no-load retraction is generally from small to large. The telescopic cylinder can achieve a longer stroke, while the length is shorter when retracted, and the structure is more compact. This kind of pneumatic cylinder is often used in construction machinery and agricultural machinery.
Swing pneumatic cylinder is an executive element that outputs torque and realizes reciprocating motion, also known as swing pneumatic motor. There are two forms of single blade and double blade. The stator block is fixed on the cylinder, and the blade and the rotor are connected together. According to the direction of oil intake, the blades will drive the rotor to swing back and forth.