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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
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  • 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 system and its control method, which are used to solve the problem of unbalanced flow of asymmetric hydraulic cylinders in the prior art and to replace Time-directed pressure mutation problem

Method used

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  • 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

Embodiment 1

[0067] Embodiment 1, the asymmetrical hydraulic cylinder 15 piston rod stretches out the action process:

[0068] The controller 17 accepts external commands, 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 two-way quantitative pump 2 to output oil at the A port and absorb oil at the B port. The conventional accumulator 6 provides two-way Quantitative pump 2B port suction flow, electromagnetic ball valve 7 is electrically connected, the pressure oil at port 2A of the two-way quantitative pump enters the rodless chamber of the asymmetric hydraulic cylinder 15; at the same time, the electromagnetic cut-off valve 12 is not powered, and the rod chamber of the asymmetric hydraulic cylinder 15 is The constant pressure accumulator 10 absorbs the oil discharged from the rod chamber of the asymmetric hydraulic cylinder 15 and maintains a certain pressure; because the forc...

Embodiment 2

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

[0070] The controller 17 accepts external instructions, and sends a displacement retraction instruction to the driver 18. The driver 18 drives the servo motor 1 to rotate in the reverse direction. The servo motor 1 drives the two-way quantitative pump 2 to output oil at the B port and to absorb oil at the A port. The conventional accumulator 6 absorbs the bidirectional Quantitative pump 2B port oil flow, electromagnetic ball valve 7 is electrically connected, bidirectional quantitative pump 2A port absorbs the oil in the rodless chamber of asymmetric hydraulic cylinder 15, thereby reducing the pressure in the rodless chamber of asymmetric hydraulic cylinder 15; The cut-off valve 12 is not powered, and the rod cavity of the asymmetric hydraulic cylinder 15 is provided by the constant pressure accumulator 10 to provide the oil sucked by the rod cavity of the asymmetric hydra...

Embodiment 3

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

[0072] The controller 17 accepts the external pressure command and simultaneously calculates the real-time pressure values ​​of the piston rod two chambers detected by the second pressure sensor 11 and the third pressure sensor 13 of the two chambers of the asymmetric hydraulic cylinder 15. If the calculated piston rod output of the asymmetric hydraulic cylinder 15 When the pressure value is less than the command pressure, the controller 17 issues an extension command to the driver 18, the driver 18 drives the servo motor 1 to rotate in the forward direction, and the servo motor 1 drives the two-way quantitative pump 2 to output oil at port A and absorb oil at port B, and the conventional accumulator 6 provides The oil suction flow rate at port 2B of the two-way quantitative pump, the electromagnetic ball valve 7 is energized, and the pressure oil at port 2A of the two-way quantitative ...

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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

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Application Information

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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
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