Gear rack pneumatic performer with ultra-long stroke

Abstract

The invention relates to a gear rack pneumatic performer with an ultra-long stroke, and belongs to the technical field of performers. The gear rack pneumatic performer comprises a cylinder body, a drive shaft and a rack piston, wherein the cylinder body is in matched connection to the drive shaft; and the drive shaft is engaged with the rack piston. The gear rack pneumatic performer is characterized in that the cylinder body comprises a left side cylinder body, a middle cylinder body and a right side cylinder body; the left side cylinder body, the middle cylinder body and the right side cylinder body are connected with one another to form the cylinder body; and both the drive shaft and the rack piston are positioned in the middle cylinder body. While guaranteeing rack piston movement stroke, the gear rack pneumatic performer with the ultra-long stroke avoids a dilemma that the length of single cylinder body is too great; and meanwhile, the middle cylinder body is designed to avoid loss, due to the fact that a rack piston guide ring and a sealing ring move back and forth at a jointing seam, of the clamp rack piston guide ring and the sealing ring.

Description

technical field [0001] The invention relates to an ultra-long stroke rack and pinion pneumatic actuator, which belongs to the technical field of actuators. Background technique [0002] A pneumatic actuator is an actuator that uses air pressure to drive the opening and closing or adjusting the valve. It is also called a pneumatic actuator or a pneumatic device, but it is generally called a pneumatic head. Pneumatic actuators are sometimes equipped with certain auxiliary devices. Commonly used are valve positioner and handwheel mechanism. The role of the valve positioner is to use the feedback principle to improve the performance of the actuator, so that the actuator can achieve accurate positioning according to the control signal of the controller. The function of the handwheel mechanism is to use it to directly manipulate the control valve to maintain the normal production when the control system has no output due to power failure, gas failure, or the controller has no ou...

AI Technical Summary

Problems solved by technology

When machining the inner hole of the cylinder, the longer cylinder length results in a longer machining stroke for the inner hole boring tool, which can only increase the length of the shank of the boring tool. A longer shank length means that with the The stroke of the boring hole is increasing continuously. Due to the influence of the long force arm on the head of the boring tool, the beating in the circumferential direction of the boring tool is constantly increasing, which is commonly known as "knife throwing" by those skilled in the art, so a better cylinder cannot be guaranteed. In vivo hole roundness and cylindricity

The out-of-control of these two shape and position tolerances means that the rack piston will have greater loss when it moves linearly in the cylinder bore, which leads to the smoothness of the rack piston movement and further reduces the output torque of the drive shaft.

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