Pneumatic valve actuator

Abstract

The invention relates to a pneumatic valve actuator. The pneumatic valve actuator comprises an air cylinder assembly, a piston assembly, a drive output assembly, an end cover assembly and a spring return assembly, wherein the air cylinder assembly comprises an air cylinder; the piston assembly comprises two pistons which are symmetrically arranged left and right; the two pistons are oppositely arranged in the horizontal direction; the two pistons are arranged in an inner cavity of a cylinder body main shaft of the air cylinder; the drive output assembly comprises a rotary shaft and an output insert; the output insert is arranged in a central through hole of the rotary shaft in a limiting mode, and rotates along with the rotary shaft; the drive output assembly is arranged in the air cylinder; a rack section part of the rotary shaft is in engaged and power connection with first racks of two pistons of the piston assembly; the end cover assembly comprises two end covers; the two end covers are separately mounted on the air cylinder from left and right ends; the spring return assembly comprises 2n springs; and the two groups of the springs are separately arranged between the end coverat one side inside the air cylinder and the corresponding piston to elastically support the corresponding piston. The actuator can operate for a long time under a high-corrosion special working condition.

Description

technical field [0001] The invention relates to the field of valve control, in particular to a valve actuator. Background technique [0002] With the advent of Industry 4.0, all walks of life have entered the industry of intelligent manufacturing, and various types of automatic control and driving devices have been widely used in all walks of life to replace the original traditional manual operations; pneumatic actuators are used as an automated The driving device, because it is driven by an air source, has an explosion-proof function compared to an electric actuator, and has a large driving torque, a long service life, and a relatively low cost, and is now widely used; [0003] At present, domestic pneumatic actuators are made of aluminum alloy or stainless steel. All metal materials cannot resist corrosion for a long time. In solar photovoltaic, semiconductor and other electronic industries, it is necessary to use strong acid to clean electronic components, which will be c...

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Problems solved by technology

[0003] At present, domestic pneumatic actuators are made of aluminum alloy or stainless steel. All metal materials cannot resist corrosion for a long time. In solar photovoltaic, semiconductor and other electronic industries, it is necessary to use strong acid to clean electronic components, which will be corrosive during the cleaning process. The medium volatilizes, so there is an acid mist in the environment. The corrosion resistance of aluminum alloy and stainless steel is far lower than that of plastic products; therefore, aluminum alloy and stainless steel pneumatic actuators will slowly rot in this environment for a long time. which in turn leads to actuator failure

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