Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for zero drift compensation of rolling mill hydraulic servo valve

A technology of hydraulic servo and compensation method, which is applied in the direction of fluid pressure actuating device, servo motor assembly, mechanical equipment, etc., can solve problems such as affecting the accuracy of servo control and the existence of zero drift, so as to improve the accuracy of hydraulic servo control and solve zero drift. Effect

Active Publication Date: 2016-04-20
WISDRI ENG & RES INC LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above problems, the purpose of the present invention is to provide a method and device for zero drift compensation of hydraulic servo valves in rolling mills, aiming to solve the technical problems of zero drift in the existing hydraulic depression control system and affecting the accuracy of servo control

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
  • Method and device for zero drift compensation of rolling mill hydraulic servo valve
  • Method and device for zero drift compensation of rolling mill hydraulic servo valve
  • Method and device for zero drift compensation of rolling mill hydraulic servo valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 The flow chart of the zero drift compensation method for the hydraulic servo valve of a rolling mill provided by the embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0029] The zero drift compensation method for a hydraulic servo valve of a rolling mill provided in this embodiment includes the following steps:

[0030] Step S101: Determine the integral enable signal according to the hydraulic pressure reduction mode and the output signal of the corresponding ramp generator, and whether the servo valve control signal exceeds the limit. The hydraulic pressure reduction mode includes a position control mode and a rolling force control mode.

[0031] The hydraulic pressure control system includes two control modes: position control mode and rolling force control mode. The servo valve control signal is generated by calculating the position deviation or the pressu...

Embodiment 2

[0076] Figure 5 The structure of a zero drift compensation device for a hydraulic servo valve of a rolling mill provided by an embodiment of the present invention is shown. For ease of description, only the parts related to the embodiment of the present invention are shown.

[0077] The zero drift compensation device for the hydraulic servo valve of a rolling mill provided by this embodiment includes:

[0078] The integral enable signal determination unit 51 is configured to determine the integral enable signal according to the hydraulic pressure reduction mode and the output signal of the corresponding ramp generator, and whether the servo valve control signal exceeds the limit. The hydraulic pressure reduction mode includes a position control mode and Rolling force control mode;

[0079] The integral reset signal acquisition unit 52 is configured to determine the integral reset signal according to the hydraulic pressure mode and whether the measuring device is faulty;

[0080] The ...

Embodiment approach

[0083] As a preferred implementation manner, the integration enable signal determination unit 51 includes:

[0084] Set in-position signal determination module, used in position control mode, when the output signal of the position ramp generator is equal to the input set value, the set position set in-position signal is valid, otherwise the set position set in-position signal is invalid; and In the rolling force control mode, when the output signal of the rolling force ramp generator is equal to the input setting value, the set rolling force set in place signal is valid, otherwise the set rolling force set in place signal is invalid;

[0085] The over-limit signal determination module is used to determine whether the servo valve control signal is within the limit range. If it exceeds the preset range, the over-limit signal is set as valid, otherwise the over-limit signal is set as invalid.

[0086] The integral enable signal determination module is used in the position control mode, ...

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 is applicable to the technical field of steel rolling control and provides a null shift compensation method and device for a hydraulic servo valve of a rolling mill. The method comprises the steps that an integral enable signal is determined according to hydraulic pressing patterns and an output signal of a corresponding slope generator in combination with the judgment of whether a control signal of the servo valve exceeds a limit, wherein the hydraulic pressing patterns comprise a position control pattern and a rolling force control pattern; an integral reset signal is determined according to the hydraulic pressing patterns and the judgment of whether a measuring device breaks down; when the integral reset signal is ineffective and the integral enable signal is effective, the control signals of the servo valve are integrated and output at a limited amplitude; amplitude-limited output values after integration are superposed to the control signals of the servo valve and output to the servo valve. By means of the technical scheme, the error between a practical null point and a control signal null point of the servo valve is compensated for, and the accuracy of hydraulic servo control of the rolling mill is improved.

Description

Technical field [0001] The invention belongs to the technical field of steel rolling control, and in particular relates to a zero drift compensation method and device for a hydraulic servo valve of a rolling mill. Background technique [0002] Modern rolling mills mostly use hydraulic pressing systems to provide rolling force. The hydraulic pressing control system usually consists of electrical controllers, servo valves, and hydraulic cylinders. The electrical controller calculates the servo valve control signal (voltage or current signal) to the servo valve to control the opening degree of the servo valve. Different opening degrees correspond to different hydraulic oil flows, and then control the hydraulic cylinder to provide different rolling forces for steel rolling . [0003] In the hydraulic pressure control system, the control mode is generally divided into two types: position control mode and rolling force control mode. [0004] In the position control mode, the electrical c...

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
Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02F15B21/04
Inventor 陈跃华
Owner WISDRI ENG & RES INC LTD