Actuator and displacement detection method thereof

Abstract

The invention discloses an actuator and a displacement detection method thereof. The actuator comprises a cylinder barrel; a shaft body which is arranged in the cylinder barrel and reciprocates in theaxial direction of the cylinder barrel, wherein the shaft body is provided with a plurality of spiral grooves, and the spiral grooves are filled with conductive materials and used for forming reflecting electrodes; a reading head which is fixedly arranged relative to the barrel body, wherein the reading head comprises a base body, the base body is provided with a curved surface, and the curved surface is attached to the outer surface of the shaft body; an emitting electrode which is arranged on the curved surface; a receiving electrode which is arranged on the curved surface; a capacitive gate processor which is arranged on the base body and is connected with the emitting electrode and the receiving electrode through wires respectively, wherein the shaft body and the reading head form a capacitive grating displacement sensor which is used for detecting the movement condition of the shaft body. The reflecting electrode is the spiral groove, no matter which position the reflecting electrode moves to, it can be guaranteed that the emitting electrode right faces the spiral groove, residual electricity on the spiral groove can be released in time, and the problem of the residual electricity is solved.

Description

technical field [0001] The invention relates to the field of hydraulic / pneumatic and electrical control, in particular to an actuator and a displacement detection method thereof. Background technique [0002] Patent CN110763128A discloses an actuator with displacement self-detection function. The actuator body has a piston displacement detection function, which does not require a separate displacement sensor. It has the characteristics of small size, light weight, non-destructive detection, and can reduce displacement. The space and weight occupied by the sensor expand the use of the actuator, especially for occasions with strict requirements on volume and weight. [0003] In this technical scheme, a plurality of conductive layers (such as Figure 8 shown) is arranged on the body of the piston rod in an annular array. When the flexible circuit board is facing the conductive layer, it is equivalent to charging the conductive layer. When the flexible circuit board is removed, ...

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Problems solved by technology

[0003] In this technical solution, a plurality of conductive layers (such as Figure 8 shown) is arranged on the body of the piston rod in an annular array. When the flexible circuit board is facing the conductive layer, it is equivalent to charging the conductive layer. When the flexible circuit board is removed, since the conductive layer is an independent ring structure, The remaining power cannot be released in time, which will affect the accuracy of the measurement

In addition, due to the ring structure, it is difficult to control the consistency and periodicity between multiple conductive layers during processing, resulting in a large cumulative error, which also affects the measurement accuracy

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