What device can accurately position the cylinder at any position of the stroke?

Pneumatic is not accurate, only accurate. You can try a mechanical brake cylinder. If you add insurance, you should also add three-position middle-sealed solenoid valves and two single throttle valves.

The cylinder is a cylindrical metal part, which guides the piston to do linear reciprocating motion in the cylinder. The working medium expands in the engine cylinder to convert thermal energy into mechanical energy; The gas is compressed by the piston in the compressor cylinder to increase the pressure. The casing of a turbine, rotary piston engine, etc. Also commonly referred to as "cylinder". Application fields of cylinder: printing (tension control), semiconductor (spot welding machine, chip grinding), automation control, robot, etc.

Cylinder type:

Pneumatic transmission converts the pressure energy of compressed gas into machinery.

cylinder

Capable pneumatic actuators. There are two types of cylinders: reciprocating linear motion and reciprocating swing. Cylinders that do reciprocating linear motion can be divided into four types: single-acting cylinder, double-acting cylinder, diaphragm cylinder and impact cylinder.

① Single-acting cylinder: only one end has a piston rod, which supplies air from one side of the piston to generate air pressure, which pushes the piston to generate thrust and returns by spring or self-weight.

② Double-acting cylinder: alternately supply air from both sides of the piston and output force in one or two directions.

(3) Diaphragm cylinder: the piston is replaced by diaphragm, and the force is only output in one direction, which is reset by spring. Its sealing performance is good, but its stroke is short.

④ Impact cylinder: This is a new type of component. It converts the pressure energy of compressed gas into the kinetic energy of piston's high-speed (10 ~ 20m/s) movement, thus doing work.

⑤ Rodless cylinder: the general term for rodless cylinder. There are magnetic columns and cable columns.

A cylinder that swings back and forth is called a swinging cylinder. The inner cavity is divided into two parts by blades, and air is alternately supplied to the two cavities. The output shaft swings, and the swing angle is less than 280. In addition, there are rotating cylinders, gas-liquid damping cylinders and stepping cylinders.