Structure Of SMT Pneumatic Cylinder

1) cylinder

The inner diameter of cylinder barrel represents the output force of cylinder. The surface roughness of the inner surface of the cylinder should reach Ra0.8 μ M.

2) end cover

The end cover is provided with an air inlet and exhaust port, and some end covers are also provided with a buffer mechanism. The rod side end cover is provided with a sealing ring and a dust ring to prevent air leakage from the piston rod and external dust from mixing into the cylinder. The end cover at the rod side is provided with a guide sleeve to improve the guiding accuracy of the cylinder, bear a small amount of transverse load on the piston rod, reduce the downward bending when the piston rod extends, and extend the service life of the cylinder. The guide sleeve is usually made of sintered oil-bearing alloy and forward inclined copper casting. In the past, the end cover was usually made of malleable cast iron. In order to reduce weight and prevent rust, aluminum alloy was often used for die casting, and brass was used for micro cylinder.

3) piston

The piston is a pressurized part of the cylinder. In order to prevent gas channeling between the left and right cavities of the piston, a piston sealing ring is provided. The wear-resistant ring on the piston can improve the guiding performance of the cylinder, reduce the wear of the piston sealing ring and reduce the friction resistance. The wear-resistant ring is made of polyurethane, polytetrafluoroethylene, cloth sandwiched synthetic resin and other materials. The width of the piston is determined by the size of the sealing ring and the length of the necessary sliding part. The sliding part is too short, which is easy to cause early wear and seizure. The material of piston is usually aluminum alloy and cast iron. The piston of small cylinder is made of brass.

4) piston rod

The piston rod is the most important force bearing part in the cylinder. High carbon steel is usually used, with hard chromium plating on the surface, or stainless steel to prevent corrosion and improve the wear resistance of sealing ring.

5) sealing ring

Rotating or reciprocating parts of the seal called dynamic seal, static parts of the seal called static seal.

6) When the cylinder works, the piston must be lubricated by the oil mist in the compressed air. There are also a small number of lubrication free cylinders.