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Control method for preventing hydraulic impact in advance

A control method and impact force technology, applied in fluid pressure actuation devices, fluid pressure actuation system testing, servo motors, etc., can solve problems such as system vibration, system oil leakage, secondary damage to personnel, and the environment, and achieve improvement Efficiency and quality, prevention of hydraulic impact, and effects of reducing secondary damage

Inactive Publication Date: 2014-10-01
陈俐丹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a hydraulic shock occurs, the peak value of the local pressure change in the system can reach several times the normal working pressure. Meter, flow meter failure, pressure relay and sequence valve wrong signal, pressure regulating valve, flow valve damage, etc., may even cause the load of the concrete sample (component) to directly reach the limit load and cause the sample (component) to be scrapped
Hydraulic shock not only affects the reliability of the hydraulic system itself, but also may cause cracking and scrapping of concrete samples (components), and may also cause secondary damage to personnel and the environment
[0004] The limitations of the existing hydraulic shock prevention technologies are: most of them are physical improvements for the power system, executive system, control system, auxiliary system and hydraulic oil of the hydraulic system. There are still insufficient improvements in the control method, and the disadvantages of hydraulic shock have not been eradicated.

Method used

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  • Control method for preventing hydraulic impact in advance
  • Control method for preventing hydraulic impact in advance
  • Control method for preventing hydraulic impact in advance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The control object of a control method for preventing hydraulic shock force in advance is load:

[0014] A 500-ton electro-hydraulic servo pressure testing machine, the system control frequency f min is 150Hz, the test requires loading speed v y The maximum valve opening is 18.0kN / s, and the maximum valve opening is 30000. After the testing machine is started, the oil cylinder runs until the test piece is 2mm away from the upper platen of the testing machine, pauses and resets the load to zero. Generally, when the hydraulic test starts, the automatic conversion program will be executed firstly—in order to ensure the slow loading of the oil cylinder, the computer controls the initial loading valve opening to 1000, and when the load is 1000N, the computer control system will automatically switch The actual loading speed v is equal to the required loading speed v y , and at the same time satisfy that the actual loading acceleration a is less than or equal to the maximum ...

Embodiment 2

[0037] The control object of a control method for preventing hydraulic shock force in advance is strain:

[0038] A 30-ton electro-hydraulic servo universal testing machine, the system control frequency f minThe tension test requires a strain rate of 6με / s and a maximum valve opening of 40,000. After the testing machine is started, the oil cylinder runs to an appropriate position, pauses and resets the load and strain to zero. Generally, when the hydraulic test starts, the automatic conversion program will be executed firstly—in order to ensure the slow loading of the oil cylinder, the computer controls the initial loading valve opening to 1000, and when the load is 100N, the testing machine system will automatically switch The actual loading strain velocity v is equal to the required loading strain velocity v y , and at the same time meet the actual loading acceleration a is less than or equal to the maximum acceleration a max , and set the initial velocity v of the cylinde...

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Abstract

The invention relates to a control method for preventing hydraulic impact in advance. The method includes the following steps of setting a hydraulic system initial loading time coefficient k according to control frequency fmin and test required loading speed vy of a hydraulic system and work performance of the hydraulic system, calculating a hydraulic system initial loading time tc and the maximum initial loading acceleration speed amax, and calculating the maximum acceleration speed amax according to the hydraulic test required loading speed vy, wherein the hydraulic system has to meet the requirement that actual loading speed v is equal to the required loading speed vy and the requirement that actual loading acceleration speed a is smaller than or equal to the maximum acceleration speed amax at the same time during the hydraulic test loading process, the maximum acceleration speed amax can be loaded in a segmented gradual increasing mode, and accordingly the hydraulic impact can be prevented. By means of the method, the situation that concrete samples (components) crack and are scrapped due to the hydraulic impact is prevented, secondary harm to personnel and environment can be avoided, and reliability and efficiency of the whole system are improved.

Description

technical field [0001] The invention relates to a control method for a hydraulic system in the field of electromechanical control, in particular to a control method capable of preventing hydraulic impact force in advance. Background technique [0002] A complete hydraulic system consists of six parts: power system, data processing system, control system, executive system, auxiliary system and hydraulic oil. The power system converts the mechanical energy of the prime mover into the pressure energy of the liquid; the data processing system processes the input command signal and measurement system data, and commands the action of the control system; the control system controls and adjusts the pressure, flow and direction of the liquid in the hydraulic system The executive system converts the pressure energy of the liquid into mechanical energy, and drives the load for linear reciprocating or rotary motion; the auxiliary system mainly refers to the oil tank, oil filter, oil pip...

Claims

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Application Information

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IPC IPC(8): F15B11/02F15B19/00
Inventor 陈俐丹
Owner 陈俐丹
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