Steel-cable-driven type pneumatic actuator

Abstract

The invention belongs to the technical field of pneumatic actuators, and discloses a steel-cable-driven type pneumatic actuator. The steel-cable-driven type pneumatic actuator comprises a driving mechanism, a piston type pneumatic mechanism and a spring reset mechanism; the driving mechanism comprises a box, a box cover and a driving pulley, and the driving pulley is connected with a front steel cable and a rear steel cable; the piston type pneumatic mechanism comprises a front cylinder head, a cylinder tube, a rear cylinder head and a piston which are fixedly connected; the piston is connected with the front end of the front steel cable through a front steel cable traction rod; and the spring reset mechanism comprises a spring tube front cover, a spring tube, a spring tube rear cover, a compression spring and a spring seat which are fixedly connected, and the spring seat is connected with the rear end of the rear steel cable through a rear steel cable traction rod. According to the steel-cable-driven type pneumatic actuator, rolling friction completely occurs in the traction movement process, the output torque loss caused by a traditional piston type actuator converting from linear movement to rotating movement is avoided, the movement process is more stable, output torque with linear characteristics is provided for valve driving of the angular travel, and the more stable control requirements required by the valve are met.

Description

technical field [0001] The invention relates to a pneumatic actuator, in particular to a cable-driven pneumatic actuator with linear output torque characteristics, stable action and smaller space occupation, belonging to the technical field of pneumatic actuators. Background technique [0002] Quarter-turn valves (such as ball valves, butterfly valves, etc.) are widely used in process control systems and chemical plants. Among the existing optional actuators, the pneumatic piston actuator is often the most option when high torque is required. In traditional pneumatic piston actuators, the crank arm connecting rod or crank arm slider structure is generally used as the main way to convert the linear motion provided by the piston into the rotary motion of the crank arm. [0003] In the traditional crank arm connecting rod or crank arm slider structure, due to the constant change of the component angle of the thrust force during the movement, the tangential force value acting o...

AI Technical Summary

Problems solved by technology

Due to the influence of sliding friction, the output torque is not stable enough, resulting in insufficient stability of the valve action; at the same time, it is necessary to overcome a certain static friction force when the action is started, which makes the torque output hysteresis and the response is not sensitive enough, which is not conducive to the rapid action of the valve. Response, there are certain limitations in the selection

Images