Constant-backpressure direct drive type electro hydraulic servo system and control method thereof

An electro-hydraulic servo system and direct-drive technology, applied in the field of servo control, can solve problems such as sudden pressure changes and unbalanced flow of asymmetric hydraulic cylinders, and achieve the effects of simplifying the control scheme, solving the problem of unbalanced flow, and reducing the difficulty of control

Active Publication Date: 2016-06-29
CISDI ENG CO LTD
View PDF11 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a constant back pressure direct-drive electro-hydraulic servo syste

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Constant-backpressure direct drive type electro hydraulic servo system and control method thereof
  • Constant-backpressure direct drive type electro hydraulic servo system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0067] Embodiment 1, the process of extending the piston rod of the asymmetric hydraulic cylinder 15:

[0068] The controller 17 receives an external command and sends a displacement extension command to the driver 18. The driver 18 drives the servo motor 1 to rotate in the forward direction. The servo motor 1 drives the bidirectional quantitative pump 2 to discharge oil at port A and suction at port B. Conventional accumulator 6 provides bidirectional The fixed pump 2B port sucks oil flow, the solenoid ball valve 7 is electrically connected, and the two-way fixed pump 2A port pressure oil enters the rodless cavity of the asymmetric hydraulic cylinder 15; at the same time, the electromagnetic shut-off valve 12 must not be powered, and the rod cavity of the asymmetric hydraulic cylinder 15 is The constant pressure accumulator 10 absorbs the oil discharged from the rod cavity of the asymmetric hydraulic cylinder 15 and maintains a certain pressure; the force generated by the rod cav...

Example Embodiment

[0069] Embodiment 2, the retracting process of the piston rod of the asymmetric hydraulic cylinder 15:

[0070] The controller 17 accepts an external command and sends a displacement retract command to the driver 18. The driver 18 drives the servo motor 1 to rotate in the reverse direction. The servo motor 1 drives the bidirectional quantitative pump 2 to discharge oil from port B and to absorb oil from port A. Conventional accumulator 6 absorbs bidirectional The oil flow rate from port 2B of the quantitative pump is electrically connected to the solenoid ball valve 7. Port 2A of the bidirectional quantitative pump absorbs the oil in the rodless cavity of the asymmetric hydraulic cylinder 15, thereby reducing the pressure of the rodless cavity of the asymmetric hydraulic cylinder 15; The shut-off valve 12 must not be powered. The rod cavity of the asymmetric hydraulic cylinder 15 is provided by the constant pressure accumulator 10, and the asymmetric hydraulic cylinder 15 has the ...

Example Embodiment

[0071] Embodiment 3, the output control process of the asymmetric hydraulic cylinder 15:

[0072] The controller 17 receives the external pressure command and calculates the real-time two-chamber pressure value of the piston rod detected by the two-cavity second pressure sensor 11 and the third pressure sensor 13 of the asymmetric hydraulic cylinder 15. If the calculated output of the piston rod of the asymmetric hydraulic cylinder 15 is When the pressure value is less than the command pressure, the controller 17 sends an extension command to the driver 18, and the driver 18 drives the servo motor 1 to rotate in the forward direction. The servo motor 1 drives the two-way quantitative pump 2 to discharge oil at port A and suck oil at port B. The conventional accumulator 6 provides Two-way quantitative pump 2B port suction flow, solenoid ball valve 7 is electrically connected, the two-way quantitative pump 2A port pressure oil enters the rodless cavity of the asymmetric hydraulic cy...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a constant-backpressure direct drive type electro hydraulic servo system and a control method thereof. The constant-backpressure direct drive type direct electro hydraulic servo system comprises a controller, a driver, a servo motor, a bidirectional constant delivery pump and an asymmetric hydraulic cylinder, wherein the controller, the driver and the servo motor are sequentially connected, the controller controls the servo motor to operate through the driver, the servo motor, the bidirectional constant delivery pump and the asymmetric hydraulic cylinder are sequentially connected, and the servo motor controls the output flow and direction of the bidirectional constant delivery pump for realizing motion control over the asymmetric hydraulic cylinder. The invention further provides the control method of the constant-backpressure direct drive type electro hydraulic servo system. The control method is suitable for controlling the asymmetric hydraulic cylinder of a vertical or non-horizontal installation structural style, the problem of unbalanced flow of the asymmetric hydraulic cylinder and the problem of pressure jump generated in reversing are completely solved, the loop cost can be greatly lowered on the premise of meeting the requirements of the system control accuracy and the response characteristic, and the control scheme can be simplified.

Description

technical field [0001] The invention belongs to the technical field of servo control, in particular to a constant back pressure direct drive electro-hydraulic servo system and a control method thereof. Background technique [0002] Due to its fast response, high control precision, good stability, and easy automatic control, the electro-hydraulic servo system was first applied to the aviation and military fields, and then gradually entered the industrial and civilian fields. At present, it has been widely used in metallurgy, engineering machinery, military industry, aviation, shipbuilding, chemical industry and other industries. Most of the core components of traditional electro-hydraulic servo systems use electro-hydraulic servo valves. Their prominent disadvantages are high maintenance and operation requirements and high energy consumption. Especially electro-hydraulic servo valves have high requirements for oil cleanliness and poor anti-pollution ability. With the rapid d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F15B11/08F15B11/10F15B1/04F15B21/08
CPCF15B1/04F15B11/08F15B11/10F15B21/087
Inventor 刘玉李新有方学红陶晶
Owner CISDI ENG CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap