A circular, simple metal part that guides the piston through the cylinder in a straight reciprocating motion. Air transforms heat into mechanical energy by expanding in the engine cylinder; The gas is compressed by the piston in the compressor cylinder to increase the pressure. The casing of a turbine, a rotary piston engine, etc., is often called a "cylinder". Cylinder applications: printing (tension control), semiconductor (spot welding machine, chip grinding), automation control, robot, and so on.
Different Types of Cylinder
(1) Single acting cylinder: only one end of the piston rod, from the side of the piston to produce air pressure, air pressure to push the piston to produce thrust out, return by spring or weight.
(2) Double-acting Cylinder: alternately supply air from both sides of the piston and output force in two directions.
(3)Diaphragm Cylinder: diaphragm instead of a piston, only in one direction output force, with a spring reset. It has good sealing performance but short travel.
(4)Impact Cylinder: this is a new type of component. It converts the pressure energy of the compressed gas into the kinetic energy of the piston's high-speed (10~20 m/s) movement to do work.
(5)Rodless Cylinder: the general name of the cylinder without a piston rod. There are magnetic cylinders, and cable cylinders two categories.
The reciprocating swing cylinder is called the swing cylinder, the blade will be separated into two cavities, to the two cavities alternately, the output shaft swing motion, swing Angle is less than 280°. In addition, there are rotary cylinders, gas-liquid damping cylinders, and stepping cylinders.
Structure of Cylinder
The cylinder is composed of a cylinder, end cover, piston, piston rod, and seals, and its internal structure is shown in figure 2: end cover
The end cover is provided with an inlet and exhaust vent, and some are also provided with a buffer mechanism in the end cover. The sealing ring and dustproof ring are arranged on the end cover of the rod side to prevent air leakage from the piston rod and prevent external dust from mixing into the cylinder. The guide sleeve is arranged on the end cover of the rod side to improve the guiding accuracy of the cylinder, bear a small amount of transverse load on the piston rod, reduce the 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, forward-tipped copper castings. The end cover used to be malleable cast iron, in order to reduce weight and rust, aluminum alloy die casting is often used, and the miniature cylinder uses brass materials.
A piston is a pressurized part of a cylinder. A piston sealing ring is provided to prevent the left and right cavities of the piston from channeling each other. The wear ring on the piston can improve the steering of the cylinder, reduce the wear of the piston seal ring, and reduce friction resistance. Wear-resistant ring long use of polyurethane, ptfe, cloth synthetic resin, and other materials. The width of the piston is determined by the size of the seal ring and the necessary length of the sliding part. The sliding section is too short to cause early wear and jam. The material of the piston is usually aluminum alloy and cast iron, and the piston of the small cylinder is yellow
The piston rod is the most important force component in the cylinder. Usually, high carbon steel with hard chrome plating or stainless steel is used to prevent corrosion and improve the wear resistance of the sealing ring.
Rotary or reciprocating motion parts of the seal are called dynamic seals, and static parts of the seal are called static seals. The connection methods of the cylinder and end cover are mainly as follows:
Integral type, riveting type, thread connection type, flange type, pull rod type.
the cylinder should be lubricated by the oil mist in the compressed air. There are also small parts of lubricating free cylinders.
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