Position control system of hydraulic stepping driver and control method applying same

Abstract

The invention discloses a position control system of a hydraulic stepping driver and a control method applying the same. The position control system comprises a main cylinder, a first driven cylinder,a second driven cylinder, a first switching valve, a second switching valve, a third switching valve, a fourth switching valve and a three-position four-way valve, wherein the interiors of the firstdriven cylinder and the second driven cylinder each are composed of a driven piston with a sealing piece and a reset spring, two through holes in one end of the three-position four-way valve are correspondingly connected with a hydraulic source and an oil tank, through holes in another two ends of the three-position four-way valve are correspondingly connected with the other end of the first switching valve and the other end of the third switching valve, the other end of the first switching valve is correspondingly connected with one end of the second switching valve and a spring-free cavity of the first driven cylinder, the other end of the second switching valve and a spring cavity of the first driven cylinder are connected in parallel and then are connected with a rodless cavity of themain cylinder, a rod cavity of the main cylinder is connected to one end of the fourth switching valve and a spring cavity of the second driven cylinder, and the other end of the fourth switching valve is connected with a spring-free cavity of the driven cylinder in parallel and then is connected with one end of the third switching valve. According to the position control system of the hydraulic stepping driver and the control method applying the same, accurate hydraulic cylinder stepping motion can be realized without a position sensor, and the system is low in cost and has strong oil-pollution resistance.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a position control system of a hydraulic stepping driver and a control method thereof. Background technique [0002] In the case of high power, high responsiveness of position control, and compact structure, electro-hydraulic proportional control or electro-hydraulic servo control technology is generally used. However, this type of technology has high cost (especially electro-hydraulic servo control), is sensitive to oil contamination and has low system efficiency. In addition, in order to achieve position control, high-precision external or built-in sensors are often required, which not only increases additional costs, but also makes installation inconvenient and reduces system reliability. That is, the sensor will not only increase the cost and increase the risk of failure, but also affect the wiring, and the installation of the sensor is sometimes limited by the installati...

AI Technical Summary

Problems solved by technology

However, this type of technology has high cost (especially electro-hydraulic servo control), is sensitive to oil pollution and has low system efficiency

In addition, in order to achieve position control, high-precision external or built-in sensors are often required, which not only increases additional costs, but also makes installation inconvenient and reduces system reliability.

That is, the sensor will not only increase the cost and increase the risk of failure, but also affect the wiring, and the installation of the sensor is sometimes limited by the installation space

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