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Method for determining and maintaining defect of servo valve

A servo valve and defect technology, which is applied in the field of defect judgment and maintenance of hot-rolled steel plate thickness control hydraulic servo valves, can solve problems such as servo valve defect judgment and maintenance, and reduce spare parts reserves and expenses. The method is simple and easy, The effect of reducing wear

Active Publication Date: 2011-06-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Because of this, there is no practical servo valve defect determination and maintenance technology in China so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The MK type servo valve amplifier mainly obtains high stability and low fluctuation output current through the current feedback mode of the MK type valve force motor control, and can also reduce the failure of the force motor coil temperature increase. The circuit of the strain detector on the MK valve can easily constitute a high-precision feedback control system. The internal stable DC power supply allows the use of industrial AC power as an external power supply. Through the control switch and digital instrument on the front panel, the internal test signal circuit can easily adjust and test the MK valve. The (I / V conversion) circuit for the sensor DC signal (4 to 20mA) is less sensitive to noise. Supervisory circuits are used to monitor for unexpected conditions. Such as the abnormality of the DC power supply, the current overload of the force motor coil of the servo valve, the zero point deviation of the servo valve and the main valve, and the unstable vibration o...

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PUM

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Abstract

The invention relates to a method for determining and maintaining the defect of a servo valve. In the method, the defect type is determined according to the static characteristic curve test result of the servo valve or the roller gap change condition of a rolling mill; the displacement of a valve plug is determined according to the hydraulic output power change of the servo valve, and the abrasion loss of a valve sleeve and the valve plug is determined according to the numerical value fluctuation degree of an internal leakage curve; fit clearance is reduced by improving the assembly accuracy of the valve plug and the valve sleeve; and the electrical zero of the servo valve is adjusted, and the relative position of a valve core and the valve sleeve is adjusted, so that the internal leakageof the servo valve and the abrasion of the valve core and the valve sleeve are reduced, the service life of the servo valve is prolonged, the reserve of spare parts and cost are reduced, and the thickness control accuracy of a steel plate and the qualification rate of a product are improved.

Description

technical field [0001] The invention belongs to the field of hydraulic mechanical equipment, and in particular relates to a defect judgment and maintenance method for a hydraulic servo valve used for controlling the thickness of a hot-rolled steel plate. Background technique [0002] The steel plate rolling production line of the hot-rolled strip mill is equipped with an automatic thickness control system (AGC for short) and an automatic width control system (AWC for short). The servo system is used to complete the hydraulic servo system, and the response speed of the hydraulic servo system is guaranteed by the servo valve with excellent performance. Servo valve is the most important hydraulic component in hydraulic system control and also requires the highest precision. At present, most of the servo systems used in the rough rolling, finishing rolling and coiling of domestic hot-rolled strip steel production lines are the MK servo valves produced by Japan's Mitsubishi and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B19/00
Inventor 张凤龙
Owner ANGANG STEEL CO LTD
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