Working principle of mini cylinder

Mini cylinders determine the push and pull forces on the piston rod according to the amount of force required to do the job. Therefore, when selecting the cylinder, the output force of the cylinder should have a slight margin. If the cylinder diameter is too small, the output force will not be enough, and the cylinder will not work normally; but if the cylinder diameter is too large, it will not only make the equipment bulky and costly, but also increase the gas consumption, resulting in energy waste. In the design of the fixture, the booster mechanism should be used as much as possible to reduce the size of the cylinder.

The end cover of the mini cylinder is provided with an intake and exhaust port, and some are also provided with a buffer mechanism in the end cover. A sealing ring and a dust-proof ring are provided on the rod side end cover to prevent air leakage from the piston rod and prevent external dust from mixing into the cylinder. There is a guide sleeve on the end cover of the rod side to improve the guiding precision of the cylinder, bear a small amount of lateral load on the piston rod, reduce the bending amount of the piston rod when it is extended, and prolong the service life of the cylinder. Guide sleeves are usually made of sintered oil-impregnated alloy, forward-leaning copper castings. In the past, malleable cast iron was often used for end caps, but now aluminum alloy die-casting is often used in order to reduce weight and prevent rust, and brass is used for miniature cylinders.

The inner diameter of the cylinder represents the size of the output force of the cylinder. The piston should slide back and forth smoothly in the cylinder, and the surface roughness of the inner surface of the cylinder should reach Ra0.8um. For steel cylinders, the inner surface should also be plated with hard chromium to reduce frictional resistance and wear, and to prevent corrosion. In addition to high-carbon steel pipes, high-strength aluminum alloy and brass are used as cylinder material. There are mini cylinders that 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.