Friction-free air cylinder capable of adjusting air film gap

Abstract

The invention discloses a friction-free air cylinder capable of adjusting an air film gap, and relates to the field of linear driving mechanisms. The air cylinder comprises an air cylinder barrel, a first end cover and a second end cover, and the first end cover and the second end cover are arranged on the two ends of the air cylinder barrel. A working cavity is formed in the air cylinder barrel, a piston assembly is arranged in the working cavity, a first air hole communicated with the working cavity is formed in the first end cover, the second end cover comprises a plurality of end cover blocks which are spliced with one another, and a second distance adjusting assembly is arranged between every two adjacent end cover blocks. A second air film face is machined on the side, close to a through gap, of at least one end cover block, and air film supporting can be formed for a piston and / or a piston rod part penetrating through the through gap by conducting ventilation on the interior of the second air film face. According to the air cylinder, a split design which is relatively easy to produce is carried out on the end cover in contact with the piston assembly part, and the gap between each monomer part forming the end cover can be finely adjusted, so that the purpose of conveniently adjusting the supporting air film is achieved.

Description

technical field [0001] The invention relates to the field of linear drive mechanisms, in particular to a frictionless cylinder with an adjustable air film gap. Background technique [0002] Ordinary cylinders generally use mechanical seals. There is friction between the inner wall of the cylinder and the piston, as well as the rod end cover and the piston rod. In order to reduce the friction, common methods include adding lubricating oil to the actual contact position and using low-friction materials. The above method only reduces the frictional resistance to the movement of the piston, but the frictional force has not been effectively eliminated. [0003] In the prior art, there are diaphragm-type low-friction cylinders and non-friction cylinders using air bearings and gap seals. The former uses rubber diaphragms as actuators, and there is no leakage during work, and the frictional resistance is small. Limitation, the working stroke and life of the cylinder are limited; th...

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Problems solved by technology

[0003] In the prior art, there are diaphragm-type low-friction cylinders and non-friction cylinders using air bearings and gap seals. The former uses rubber diaphragms as actuators, and there is no leakage during work, and the frictional resistance is small. Limitation, the working stroke and life of the cylinder are limited; the latter makes the friction of the piston in motion almost negligible. This new type of cylinder has breakthroughs in low-speed and high-speed high-frequency motion applications, but there are processing difficulties and Its air film gap is not adjustable, and the usage scenarios are easily limited

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