Types And Structures Of Non-sensing Cylinders
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Types of rodless cylinders
1. Single-acting rodless cylinder: There is only one piston rod at one end. The air source on the side of the piston can generate air pressure, which pushes the piston to generate thrust and returns through a spring or deadweight.
2. Double-acting rodless cylinder: Air is supplied to both sides of the piston alternately, and force is output in one or two directions.
3. Diaphragm rodless cylinder: The piston is replaced with a diaphragm, and force is output only in one direction, and then reset with a spring. It has good sealing performance, but a short stroke.
4. Impact Cylinder: This is a new type of component. It converts the pressure energy of compressed gas into the kinetic energy of the high-speed (10-20 m/s) movement of the piston, so that it works.
5. Rodless Cylinder: A general term for cylinders without piston rods. There are two types of magnetic cylinders and cable cylinders. A cylinder that performs reciprocating swing is called a swing cylinder. The inner cavity is divided into two parts by a blade, and air is alternately supplied to the two chambers. The output shaft swings, and the swing angle is less than 280°. In addition, there are rotary cylinders, gas-liquid damping cylinders and stepping cylinders.
The cylinder consists of a cylinder body, an end cover, a piston, a piston rod and a seal:
1. The end cover is provided with an air inlet and an exhaust port, and some also have a buffer mechanism inside the end cover. A sealing ring and a dustproof sealing ring are provided on the rod side end cover to prevent air leakage from the piston rod and prevent external dust from entering the cylinder. A guide sleeve is provided on the rod side end cover, which improves the guiding accuracy of the cylinder, bears a small amount of lateral load on the piston rod, reduces the amount of downward bending when the piston rod is extended, and extends the service life of the cylinder. The guide sleeve usually uses sintered oil-containing alloys, positive lead copper castings. The end cover used to be malleable cast iron. In order to reduce weight and prevent rust, aluminum alloy die casting is often used, and the micro cylinder is made of brass.
2. The piston is a stressed component in the cylinder. In order to prevent the left and right chambers of the piston from suffocating each other, a piston sealing ring is provided. The wear ring on the piston improves the guidance of the cylinder, reduces the wear of the piston seal and reduces the friction resistance. The length of the wear-resistant ring is made of polyurethane, polytetrafluoroethylene, cloth synthetic resin, etc.
The width of the piston is determined by the size of the seal and the length of the necessary sliding part. The sliding part is too short to cause early wear and seizures. The piston is made of aluminum alloy and cast iron, and the piston of the small cylinder is made of brass.
3. The piston rod is an important force-bearing component of the cylinder. It is usually made of high-carbon steel, hard chrome plating or stainless steel to prevent corrosion and improve the wear resistance of the seal.
4. The seal of the element when the sealing ring rotates or reciprocates is called a dynamic seal, and the seal of the stationary part is called a static seal. The main connection methods between the cylinder barrel and the end cover are: integral type, riveted type, threaded type, flange type, and tie rod type.
5. When working, the cylinder should be lubricated by oil mist in the compressed air. There are also a small number of non-lubricated oil cylinders.
