Cylinder internal structure diagram, detailed introduction of cylinder structure composition

Cylinders play a crucial role in the assembly line, so how much do you know about cylinders?


Pneumatic actuators that convert the pressure energy of compressed gas into mechanical energy in pneumatic transmission. There are two types of cylinders: those with reciprocating linear motion and those with reciprocating swing. Cylinders with reciprocating linear motion can be divided into single-acting, double-acting, and diaphragm 4 types of type and impact cylinder.





Cylinder internal structure diagram


The cylinder is composed of cylinder barrel, end cover, piston, piston rod and seals. Its internal structure is as shown in the figure:








Detailed introduction of cylinder structure and composition


1) Cylinder tube
The inner diameter of the cylinder barrel represents the output force of the cylinder. The piston must reciprocate smoothly in the cylinder, and the surface roughness of the inner surface of the cylinder should reach Ra0.8um. For steel tube cylinders, the inner surface should also be plated with hard chromium to reduce frictional resistance and wear and prevent corrosion. In addition to using high-carbon steel pipes, the cylinder barrel material is also made of high-strength aluminum alloy and brass. Some small cylinders use stainless steel tubes. For cylinders with magnetic switches or cylinders used in corrosion-resistant environments, the cylinder barrel should be made of stainless steel, aluminum alloy or brass. The cylinder piston uses a combined sealing ring to achieve two-way sealing, and the piston and piston rod are connected by riveting without nuts.






2) End cap
The end cover is provided with intake and exhaust openings, and some also have a buffer mechanism inside the end cover. The rod side end cover is equipped with a sealing ring and a dust ring to prevent air leakage from the piston rod and external dust from mixing into the cylinder. There is a guide sleeve on the rod side end cover to improve the guiding accuracy of the cylinder, bear a small amount of lateral load on the piston rod, reduce the amount of downward bending of the piston rod when it extends, and extend the service life of the cylinder. Guide sleeves are usually made of sintered oil-containing alloy, forward-inclined copper castings. In the past, malleable iron was commonly used for end caps. Nowadays, in order to reduce weight and prevent rust, aluminum alloy die-casting is often used, and brass materials are sometimes used for micro cylinders.






3) Piston
The piston is the pressurized part in the cylinder. In order to prevent the left and right chambers of the piston from channeling air, a piston sealing ring is provided. The wear-resistant ring on the piston can improve the guidance of the cylinder, reduce the wear of the piston seal ring, and reduce friction resistance. The wear-resistant ring length uses materials such as polyurethane, polytetrafluoroethylene, cloth-filled synthetic resin, etc. The width of the piston is determined by the size of the sealing ring and the necessary length of the sliding section. The sliding part is too short, which can easily cause early wear and jamming. The materials of piston are commonly aluminum alloy and cast iron, and 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. Usually high carbon steel is used, with hard chromium plating on the surface, or stainless steel is used to prevent corrosion and improve the wear resistance of the sealing ring.






5)Sealing ring
The seal of the rotating or reciprocating parts is called a dynamic seal, and the seal of the stationary part is called a static seal. The connection methods between the cylinder barrel and the end cover mainly include the following types: integral type, riveting type, threaded connection type, flange type, and tie rod type.






6) When the cylinder is working, it relies on the oil mist in the compressed air to lubricate the piston. There are also a small number of lubrication-free cylinders.







The above is the internal structure diagram of the cylinder, and the detailed introduction of the cylinder structure composition. If you want to know more relevant information, please log in to Sunway Pneumatic www.diancifa.cc to view.