Rapid magnetizing and demagnetizing method for triple redundant servo valve

Abstract

The invention belongs to the technical field of hydraulic control, and specifically relates to a rapid magnetizing and demagnetizing method for a triple redundant servo valve. The rapid magnetizing and demagnetizing method comprises the following steps: step one, mounting the integral triple redundant servo valve on a test board, wherein the triple redundant servo valve comprises a second pre-stage, a third pre-stage and a first pre-stage; step two, carrying out magnetizing and demagnetizing on the second pre-stage to adjust flow gain; step three, recording demagnetizing voltage after the second pre-stage is demagnetized, drawing a non-load flow curve, and calculating the flow gain of the second pre-stage; and step four, carrying out magnetizing and demagnetizing and flow gain calculationon the first pres-stage and the third pre-stage in sequence according to the method in the third step. According to the method, the flow gain of the single pre-stage can be rapidly adjusted through mutual isolation of tools in a space magnetic field under the premise of without dismounting any pre-stage.

Description

technical field [0001] The invention belongs to the technical field of hydraulic control, and in particular relates to a method for quickly charging and demagnetizing a three-redundancy servo valve. Background technique [0002] The three-redundancy servo valve is a servo valve with three pre-level redundant structural designs. Our unit is the earliest unit in China to develop and produce three-redundancy servo valves. The developed products have been successfully used in manned spaceflight. Rocket model, the ordinary servo valve has only one pre-stage, a total of three zero positions (hydraulic zero position, mechanical zero position, electromagnetic zero position), while the triple-redundancy servo valve has three pre-stages, so there are 9 zero positions, Moreover, the requirements for the consistency of the flow gains of the three pre-stages are high, which makes debugging difficult. [0003] The pre-stage is composed of permanent magnets, upper and lower magnets, contr...

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Problems solved by technology

[0002] The three-redundancy servo valve is a servo valve with three pre-level redundant structural designs. Our unit is the earliest unit in China to develop and produce three-redundancy servo valves. The developed products have been successfully used in manned spaceflight. Rocket model, the ordinary servo valve has only one pre-stage, a total of three zero positions (hydraulic zero position, mechanical zero position, electromagnetic zero position), while the triple-redundancy servo valve has three pre-stages, so there are 9 zero positions, And the flow gain consistency requirements of the three pre-stages are high, which makes debugging difficult

[0003] The pre-stage is composed of permanent magnets, upper and lower magnets, control coils and armature components. When debugging the electromagnetic zero position, it is necessary to balance the electromagnetic zero position by charging and demagnetizing the pre-stage. Because the parts that make up the pre-stage are large Some of them are magnetically permeable materials, which are sensitive to magnetic fields. In order to avoid the mutual influence of the three pre-stages in the magnetic field, the electromagnetic zero adjustment of the three-redundancy servo valve must be debugged separately for each pre-stage, so the entire debugging process It is necessary to repeatedly assemble and disassemble a single pre-stage 6 times to complete the adjustment of the whole valve flow gain of the three-redundancy servo valve. The debugging process is complicated and tedious, and the work efficiency is low.

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