Automatic reversing mechanism for pneumatic motor

Abstract

The invention discloses an automatic reversing mechanism for a pneumatic motor. The automatic reversing mechanism comprises an air cylinder; an air cylinder top wall and an air cylinder lower cover are arranged at the upper and lower ends of the air cylinder; pilot valves are arranged on the air cylinder top wall and the air cylinder lower cover respectively; a piston cavity is formed between the air cylinder top wall and the air cylinder lower cover; a piston is arranged in the piston cavity; a reversing valve is arranged on the air cylinder, and comprises a reversing valve body; a reversing piston cavity is formed in the reversing valve body; a reversing piston is arranged in the reversing piston cavity; a reversing piston upper cavity, an air distributing chamber cavity and a reversing piston lower cavity are formed between the reversing piston and the reversing piston cavity; control passages, air intake passages communicated with an air source and exhaust passages communicated with air are formed in the air cylinder top wall and the air cylinder lower cover respectively; the exhaust passages are formed in the inner sides, near the piston cavity, of the air intake passages; the control passage formed in the air cylinder top wall is communicated with the reversing piston lower cavity; the control passage formed in the air cylinder lower cover is communicated with the reversing piston upper cavity.

Description

technical field [0001] The invention belongs to the technical field of reversing control of an air motor, and in particular relates to an automatic reversing mechanism of an air motor. Background technique [0002] In the existing air motor reversing mechanism, there are only two channels on the pilot valve body, the air intake hole that is normally connected to the air source and the control air hole that controls the action of the reversing mechanism, and there is no exhaust hole. It is a two-position two-way valve structure. . There is an exhaust hole on the upper and lower end covers of the piston chamber of the reversing mechanism. When the pilot valve stem is in the closed position (the piston in the cylinder does not touch the pilot valve stem), the control air hole and the air inlet hole on the pilot valve body are separated. , when the pilot valve stem is in the open position (the piston in the cylinder pushes the pilot valve stem away), the control air hole on the...

AI Technical Summary

Problems solved by technology

[0004] 1) Compressed air directly enters the control channel through the intake channel. If the compressed air source contains a lot of impurities, the impurities will enter the control channel along with the compressed air, which will easily cause reversing failure and shorten the service life of the reversing device. ;

[0005] 2) There is a "dead point". When the reversing piston drives the slider to slide up and down, when the upper and lower symmetrical center of the slider stays at the upper and lower symmetrical center of the air distribution chamber cavity, the upper cavity of the cylinder on the air distribution block will receive air The inlet and the air inlet of the lower chamber of the cylinder are blocked by the slider at the same time (commonly known as "dead point"), which leads to the failure of the reversing device and reduces the reliability of the reversing device

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