Axial wear and zero-position characteristic test device for jet tube servo valve slide

Abstract

The invention relates to a device for testing the axial grinding and zero-position characteristics of a jet tube servo valve slide valve. A displacement sensor device and a force motor device are respectively arranged on both sides of a fixing mechanism. The two sides of a grinding valve core in a slide valve assembly are respectively connected to the displacement sensor device and the force motor device through a connecting rod. The slide valve assembly is connected to two pump sources. A plug-in solenoid valve in the slide valve assembly is connected to a slide valve hydraulic axial grinding instrument. The slide valve hydraulic axial grinding instrument is used to set the electromagnet state of each solenoid valve. A low-frequency signal generator sends a current signal to a servo controller. The servo controller outputs a voltage to the force motor device, which is used to control the force motor device to apply force, thereby realizing the movement of the grinding valve core. The displacement sensor device feeds back a grinding valve core position signal to the servo controller, thereby realizing closed-loop control. An X-Y recorder draws a slide valve axial grinding curve and a slide valve zero-position flow curve by collecting the grinding valve core displacement in the servo controller and the flow value of a flow meter in the slide valve hydraulic axial grinding instrument.

Description

Technical Field

[0001] The invention relates to an electro-hydraulic servo control element in hydraulic engineering, in particular to a characteristic testing device of the electro-hydraulic servo control element. Background Art

[0002] Electro-hydraulic servo control systems are widely used in the field of navigation control of spacecraft, aviation, and ships. As the core component of the electro-hydraulic servo control system, the performance of the electro-hydraulic servo valve directly affects the quality of the entire servo control system. The slide valve assembly, as a key component in the electro-hydraulic servo valve, plays the role of power level amplification; the slide valve assembly is generally composed of a valve core and a valve sleeve, which has high precision requirements and is difficult to process. The processing of the axial matching dimensions of the valve core and the valve sleeve is a key process in the manufacturing process of the servo valve. In the actual processing and production process, the matching efficiency and quality of the slide valve assembly depend on the technical level and experience of the operator, and the human factor has a more obvious influence. Therefore, it is necessary to use a jet tube servo valve slide valve axial matching and zero-position characteristic testing technology. This technology can minimize the influence of human factors during the slide valve axial matching process, thereby meeting the design parameter requirements, improving the stability and reliability of the product, and realizing the needs of mass production. Summary of the invention

[0003] The present invention aims to provide a device for testing the axial grinding and zero-position characteristics of a jet tube servo valve slide valve, so as to meet the requirements for testing the axial grinding and zero-position characteristics of a servo valve slide valve.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present invention is: a device for testing the axial wear and zero-position characteristics of a jet tube servo valve slide valve, comprising a fixing mechanism for fixing a slide valve assembly of a tested servo valve, a displacement sensor device for measuring the movement of a wear valve core, a force motor device for applying force to move the wear valve core, a low-frequency signal generator, a servo controller and an XY recorder, wherein the displacement sensor device and the force motor device are respectively arranged on both sides of the fixing mechanism, the two sides of the wear valve core in the slide valve assembly are respectively connected to the displacement sensor device and the force motor device through a connecting rod, the slide valve assembly is connected to two pump sources, and the slide valve The plug-in solenoid valve in the component is connected to the sliding valve hydraulic axial grinding instrument, and the sliding valve hydraulic axial grinding instrument is used to set the electromagnet state of each solenoid valve. The low-frequency signal generator sends a current signal to the servo controller, and the servo controller outputs a voltage to the force motor device to control the force motor device to add force, thereby realizing the movement of the grinding valve core; the displacement sensor device feeds back the grinding valve core position signal to the servo controller, thereby realizing closed-loop control, and the XY recorder draws the sliding valve axial grinding curve and the sliding valve zero-position flow curve by collecting the grinding valve core displacement in the servo controller and the flow value of the flow meter in the sliding valve hydraulic axial grinding instrument.

[0005] Furthermore, the fixing mechanism includes a cover plate, a valve sleeve positioning block, a clamping column, a stop block, and a positioning pad. The positioning pad is connected to the sliding valve assembly via the valve sleeve positioning block. A cover plate is provided on the valve sleeve positioning block. Both ends of the cover plate are respectively connected to the positioning pad via clamping columns. The middle of the cover plate is clamped and connected to the valve sleeve positioning block via a pad via a hexagon socket head screw. The positioning pad is fixedly connected to the slider base.

[0006] Furthermore, the front and rear ends of the valve sleeve positioning block are respectively provided with stop blocks, and the two stop blocks are respectively fixedly connected to the positioning pads for front and rear limiting the valve sleeve positioning block; the positioning pads and the slider base are sealed and connected via an O-ring and then fixed via screws.

[0007] Furthermore, the displacement sensor device includes an LVDT displacement sensor, a sensor slider, and a sensor base. The LVDT displacement sensor is installed on the sensor slider via the sensor base, and the sensor base drives the LVDT displacement sensor to move left and right on the sensor slider.

[0008] Furthermore, the sensor slider is installed on the slider base and fixed by two hexagon socket head screws; the LVDT displacement sensor is installed on the sensor base and fixed by screws; the sensor slider and the sensor base are connected by adjusting screws so that the sensor base does not slip on both sides.

[0009] Furthermore, the force motor device includes a force motor slider and a force motor, and the force motor is fixedly connected to the motor slider.

[0010] Furthermore, the sliding valve assembly is connected to a connecting rod through threads, and both ends of the connecting rod are sealed and limitedly connected to the valve sleeve positioning block through O-rings and plugs respectively.

[0011] Furthermore, the oil supply pressure of one of the two pump sources is adjusted to 7 MPa, and the oil supply pressure of the other pump source is adjusted to 3.5 MPa.

[0012] Furthermore, the XY recorder is connected to a computer and a printer, and online printing of the axial wear amount is achieved through the computer and the printer.

[0013] The beneficial effects of the present invention are:

[0014] The present invention is applied to an electro-hydraulic servo valve, effectively improving the axial grinding accuracy and efficiency of the slide valve, and achieving good results.

[0015] According to the actual experimental verification of the axial matching of the sliding valve, the axial matching and zero-position characteristic testing device of the jet tube servo valve sliding valve of the present invention can effectively improve the axial accuracy and efficiency of the sliding valve, and lay a foundation for solving the bottleneck of the axial matching process of the sliding valve and realizing the mass production of the electro-hydraulic servo valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the main sectional view of the structure of the axial matching and zero-position characteristic test device for the jet tube servo valve slide valve;

[0017] Figure 2 for Figure 1 Left sectional view of

[0018] Figure 3 for Figure 1 A top view of

[0019] Figure 4 This is the working principle diagram of the axial matching and zero-position characteristic test device of the jet tube servo valve slide. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figures 1 to 3 As shown, a jet tube servo valve slide valve axial grinding and zero-position characteristic testing device is mainly composed of an M51 hexagon socket head screw 1, an M32 adjusting screw 2, a slider base 3, a sensor slider 4, a sensor base 5, a displacement sensor 6, an M37 set screw 7, a Φ88 O-type sealing ring 8, a plug 9, a connecting rod 10, an M12 hexagon socket head screw 11, a cover plate 12, a cushion block 13, a slide valve assembly 14, a grinding valve core 14-1, a grinding valve sleeve 14-2, a force motor slider 15, a force motor 16, an M51 hexagon socket screw 17, a clamping screw 18, a valve sleeve positioning block 19, a clamping column 20, an M42 hexagon socket head screw 21, a stopper 22, a positioning cushion block 23, a Φ7.8 O-type sealing ring 24, a Φ22.5 O-type sealing ring 25, an M42 set screw 26, etc.

[0022] The sensor slider 4 is installed on the slider base 3 and fixed by two M51 hexagon socket head screws 1; the displacement sensor 6 is installed on the sensor base 5 and fixed by screws; the M32 adjusting screw 2 is installed on the sensor slider 4 to fix the sensor slider 4 and the sensor base 5 to prevent the sensor base 5 from sliding on both sides; the M37 set screw 7 is used to fix the sensor core and the connecting rod 10; the connecting rod 10 and the plug 9 are sealed by Φ88 O-type sealing ring 8 to prevent leakage; the connecting rod 10 is connected to the slide valve assembly 14 by threads; the slide valve assembly 14 and the valve sleeve positioning block 19 are sealed by O-type sealing ring to prevent leakage, and the slide valve assembly 14 is limited by the plug 9; the force motor 16 is fixed by M51 hexagon socket head screw The screw 17 is fixed on the force motor slider 15; the clamping column 20 is fixed on the positioning pad 23 by the M42 hexagon socket cylindrical head screw 21; the cover plate 12 is fixed on the clamping column 20 by the clamping screw 18; the valve sleeve positioning block 19 is pressed on it by the pad 13, and then fixed by the M12 hexagon socket cylindrical head screw 11 against the pad 13, and the M12 hexagon socket cylindrical head screw 11 is connected to the cover plate 12 by thread; the valve sleeve positioning block 19 and the positioning pad 23 are limited by the stop block 22, and the stop block 22 is fixed to the positioning pad 23 by screws; the positioning pad 23 and the slider base 3 are sealed by the Φ7.8 O-ring 24, and then fixed by screws; the M42 set screw 26 is used to fix the slider base 3 and the force motor slider 15.

[0023] like Figure 4 As shown, the working principle of the axial wear and zero-position characteristic test device of the jet tube servo valve slide valve of the present invention is:

[0024] 1) Working principle of axial wear test of jet tube servo valve slide valve

[0025] Turn on the pump station, adjust the oil supply pressure of pump source P to 7MPa, and the oil supply pressure of pump source Q to 3.5MPa, and then use the slide valve hydraulic axial grinding instrument to set the electromagnet state of each threaded plug-in solenoid valve; the low-frequency signal generator sends a current signal to the given servo controller. On the one hand, the servo controller outputs voltage to control the force motor device, which is directly connected to the grinding valve core 14-1, thereby realizing the movement of the grinding valve core 14-1; on the other hand, the output signal of the LVDT displacement sensor is fed back to the servo controller to realize closed-loop control. The XY recorder draws the slide valve axial grinding curve by collecting the valve core displacement in the servo controller and the flow value of the flowmeter in the slide valve hydraulic axial grinding instrument, and realizes the function of online printing of the axial grinding amount through the computer and printer;

[0026] 2) Working principle of slide valve zero position characteristic test

[0027] Turn on the pump station and set the electromagnet status of each threaded plug-in solenoid valve through the slide valve hydraulic axial grinding instrument; the low-frequency signal generator sends a current signal to the servo controller. On the one hand, the servo controller outputs voltage to control the force motor device, and on the other hand, the output signal of the LVDT displacement sensor is fed back to the servo controller to achieve closed-loop control; the XY recorder draws the slide valve zero-position flow curve by collecting the valve core displacement in the servo controller and the flow value of the flow meter in the slide valve hydraulic axial grinding instrument, which can detect the grinding status of the slide valve assembly and whether there is jitter and other problems under small signals.

Claims

1. A device for testing the axial wear and zero-position characteristics of a jet tube servo valve slide valve, comprising a fixing mechanism for fixing the slide valve assembly of the servo valve to be tested, a displacement sensor device for measuring the movement of the wear valve core, a force motor device for applying force to move the wear valve core, a low-frequency signal generator, a servo controller and an XY recorder, characterized in that: The displacement sensor device and the force motor device are respectively placed on both sides of the fixing mechanism; the two sides of the grinding valve core in the sliding valve assembly are respectively connected to the displacement sensor device and the force motor device through connecting rods; the sliding valve assembly is connected to two pump sources; the plug-in solenoid valve in the sliding valve assembly is connected to the sliding valve hydraulic axial grinding instrument; the sliding valve hydraulic axial grinding instrument is used to set the electromagnet state of each solenoid valve; the low-frequency signal generator sends a current signal to the servo controller; the servo controller outputs a voltage to the force motor device to control the force motor device to apply force, thereby realizing the movement of the grinding valve core; the displacement sensor device feeds back the grinding valve core position signal to the servo controller, thereby realizing closed-loop control; the XY recorder collects the grinding valve core displacement in the servo controller and the sliding valve hydraulic axial The flow value of the flowmeter in the grinding instrument is used to draw the axial grinding curve of the sliding valve and the zero-position flow curve of the sliding valve; the fixing mechanism includes a cover plate, a valve sleeve positioning block, a clamping column, a stopper block, and a positioning pad block. The positioning pad block is connected to the sliding valve assembly through the valve sleeve positioning block. A cover plate is provided on the valve sleeve positioning block. The two ends of the cover plate are respectively connected to the positioning pad block through clamping columns. The middle of the cover plate is clamped and connected to the valve sleeve positioning block through a pad block by a hexagon socket head screw. The positioning pad block is fixedly connected to the slider base; the displacement sensor device includes an LVDT displacement sensor, a sensor slider, and a sensor base. The LVDT displacement sensor is installed on the sensor slider through the sensor base, and the LVDT displacement sensor is driven by the sensor base to move left and right on the sensor slider.

2. The device for testing the axial wear and zero-position characteristics of the jet tube servo valve slide valve according to claim 1 is characterized in that: The valve sleeve positioning block is provided with stop blocks at the front and rear ends respectively, and the two stop blocks are fixedly connected to the positioning pads respectively, and are used for front and rear limiting of the valve sleeve positioning block; the positioning pads are sealed and connected to the slider base through an O-ring and then fixed by screws.

3. The device for testing the axial wear and zero-position characteristics of the jet tube servo valve slide valve according to claim 1 is characterized in that: The sensor slider is installed on the slider base and fixed by two hexagon socket head screws; the LVDT displacement sensor is installed on the sensor base and fixed by screws; the sensor slider and the sensor base are connected by adjusting screws to prevent the sensor base from slipping on both sides.

4. The device for testing the axial wear and zero-position characteristics of the jet tube servo valve slide valve according to claim 1, characterized in that: The force motor device comprises a force motor slider and a force motor, and the force motor is fixedly connected to the motor slider.

5. The device for testing the axial wear and zero-position characteristics of the jet tube servo valve slide valve according to claim 1, characterized in that: The sliding valve assembly is connected to a connecting rod through threads, and both ends of the connecting rod are respectively connected to the valve sleeve positioning block for sealing and limiting through O-type sealing rings and plugs.

6. The device for testing the axial wear and zero-position characteristics of the jet tube servo valve slide valve according to claim 1, characterized in that: The oil supply pressure of one of the two pump sources is adjusted to 7 MPa, and the oil supply pressure of the other pump source is adjusted to 3.5 MPa.

7. The device for testing the axial wear and zero-position characteristics of the jet tube servo valve slide valve according to claim 1, characterized in that: The XY recorder is connected to a computer and a printer, and the online printing of the axial wear amount is realized through the computer and the printer.

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