Hydraulic actuator and method for realizing positioning control and position feedback thereof

A hydraulic actuator and actuator technology, applied in the direction of fluid pressure actuators, fluid pressure actuator system components, mechanical equipment, etc., can solve the problem of low stable speed of oil pumps, non-continuous operation, real-time tracking, and low positioning accuracy etc. to achieve the effect of reducing noise, improving anti-interference performance and reducing internal resistance of power supply

Inactive Publication Date: 2014-12-24
LIUZHOU OVM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A hydraulic actuator is a telescopic mechanism that can be used for positioning control and position feedback. It is currently widely used in hydraulic jack systems. An existing hydraulic actuator (application publication number is CN103307059A) is realized by direct oil supply from an oil pump. The telescopic cylinder of the actuator; and the oil pump has the minimum stable speed characteristic. At present, the stable minimum flow rate of domestic and foreign oil pumps reaches 1/8 of the maximum flow rate. It is 1/8 of the maximum speed, and if it needs t

Method used

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  • Hydraulic actuator and method for realizing positioning control and position feedback thereof
  • Hydraulic actuator and method for realizing positioning control and position feedback thereof
  • Hydraulic actuator and method for realizing positioning control and position feedback thereof

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Effect test

Embodiment 1

[0089] Embodiment 1: A hydraulic actuator

[0090] like Figure 1 ~ Figure 2 As shown, the hydraulic actuator includes a hydraulic cylinder assembly I, a hydraulic system II and a control system III, and the hydraulic cylinder assembly I, hydraulic system II and control system III are installed together through a connecting bracket 1;

[0091] like image 3As shown, the hydraulic cylinder assembly I includes a single-acting oil cylinder 3, upper clevis 4, cylinder head 5, front sealing plate 6, cylinder barrel 7, piston 8, oil pipe 9, valve seat 10, air pipe 11, lower end cover 12. The magnetostrictive displacement sensor 13 and the lower earring 14; the upper earring 4 and the piston 8 are connected by threads, the front sealing plate 5 is used for sealing and guiding, the lower end cover 12 is welded together with the cylinder, and the magnetostrictive displacement sensor 13 is installed on the lower end cover 12, and its measuring rod passes through the lower end cover an...

Embodiment 2

[0120] A method for positioning control and position feedback, which uses the hydraulic actuator described in Embodiment 1 of the present invention to realize positioning control and position feedback. The hydraulic actuator includes a hydraulic cylinder assembly I, a hydraulic System II and local closed-loop control system III;

[0121] Hinge the lower earring 14 end of the single-acting hydraulic cylinder 3 of the hydraulic actuator hydraulic cylinder assembly I with the ground anchor, and hinge the upper earring 4 with the head of the pull-down cable connected to the active node of the cable net. According to the position and speed commands issued by the host computer, The actuator overcomes the internal force of the cable net to generate the pull-down cable force, and changes the distance between the ground anchor point and the end of the pull-down cable at the active node of the cable net by changing the displacement of the telescopic rod, thereby adjusting the position of...

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Abstract

The invention discloses a hydraulic actuator. The hydraulic actuator comprises a hydraulic cylinder assembly, a hydraulic system and a local closed-loop control system, wherein the hydraulic cylinder assembly comprises a single-action oil cylinder, a displacement sensor, an upper ear ring and a lower ear ring; the upper ear ring is in threaded connection with a piston; the displacement sensor is arranged on a lower end cover; a measuring rod of the displacement sensor passes through the lower end cover, and extends into the piston; a magnetic ring of the displacement sensor is arranged on the end part of the piston; the piston drives the magnetic ring to move in a way of extending and retracting; the specific position of the magnetic ring is sensed through a waveguide tube in the measuring rod, so that the absolute position of the piston is detected; the hydraulic system comprises a motor, a pump, two leakage-free reversing valves and a pressure sensor, and is used for providing hydraulic power for a hydraulic cylinder and controlling the flow; the closed-loop control system comprises a main circuit module, a power supply module, a sensor module group and a microprocessor module. The hydraulic actuator has the advantages of high positioning accuracy and low cost, accurate source changing, scanning, tracking and position keeping of the oil cylinder can be realized, and continuous and stable control of the actuator during low-speed running can be ensured.

Description

technical field [0001] The invention relates to a telescopic mechanism capable of positioning control and position feedback and a method for realizing positioning control and position feedback, in particular to a hydraulic actuator and a method for realizing positioning control and position feedback. Background technique [0002] A hydraulic actuator is a telescopic mechanism that can be used for positioning control and position feedback. It is widely used in hydraulic jack systems. An existing hydraulic actuator (application publication number is CN103307059A) is realized by direct oil supply from an oil pump. The telescopic cylinder of the actuator; and the oil pump has the minimum stable speed characteristic. At present, the stable minimum flow rate of domestic and foreign oil pumps reaches 1 / 8 of the maximum flow rate, which is very good, that is to say, the stable minimum speed of the actuator of the above patent It is 1 / 8 of the maximum speed, and if it needs to be low...

Claims

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Application Information

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IPC IPC(8): F15B21/08F15B15/28
Inventor 李兴奎甘秋萍梁利文罗广文陈文辉沈继荣杨文振
Owner LIUZHOU OVM MASCH CO LTD
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