An electro-hydraulic servo valve torque motor output characteristic test device and working method

Abstract

The present invention discloses a device for testing the output characteristics of an electro-hydraulic servo valve torque motor and a working method thereof. The testing device includes a heater power supply, a temperature controller, a torque motor temperature sensor, a temperature display, a torque motor power supply, a left thermal insulation pad, a heater, a heater temperature sensor, a right thermal insulation pad, a laser displacement sensor, a feedback rod ball clamp, and a torque motor. The left thermal insulation pad, the heater, and the right thermal insulation pad form a heating and heat preservation cavity, and the torque motor is placed inside the heating and heat preservation cavity. A torque motor temperature sensor is also arranged on the torque motor, and the collected temperature signal can be directly read by the temperature display. The torque motor feedback rod ball extends out of the heating and heat preservation cavity, and the feedback rod ball clamp is used to clamp the feedback rod end ball to provide a measurement plane for the laser beam of the laser displacement sensor. The present invention has the characteristics of small size, low energy consumption, safe and convenient use, and high heating accuracy.

Description

Technical Field

[0001] The present invention relates to a device for testing the output characteristics of a torque motor of an electro-hydraulic servo valve under a high-temperature environment and a working method thereof, and belongs to the technical field of electro-hydraulic servo valves. Background Art

[0002] Electro-hydraulic servo valves are key components in electro-hydraulic servo control systems. Their compact size, light weight, and high frequency response make them widely used in the aerospace, marine, and military industries. These valves are often subject to high-temperature environments. For example, aircraft engine fuel metering units can operate at temperatures up to 120°C, and some aerospace aircraft hydraulic systems have been tested with oil temperatures reaching as high as 160°C.

[0003] As the electro-mechanical converter in electro-hydraulic servo valves, the performance of a torque motor directly impacts the static and dynamic characteristics of the entire valve. High temperatures significantly impact torque motor performance, altering its electromagnetic properties and air gap length, which in turn alters its output characteristics.

[0004] However, current domestic performance testing of torque motors in high-temperature environments relies on oil heating. This method requires a complex and expensive high-temperature test system and suffers from the disadvantage of uneven heating of the torque motor. Consequently, due to limited testing costs, current research on the performance of electro-hydraulic servo valve torque motors in high-temperature environments is limited to theoretical and numerical simulations, lacking the necessary experimental verification. Summary of the Invention

[0005] Purpose of the invention: The present invention aims to provide an electro-hydraulic servo valve torque motor output characteristic test device and its working method, the test device has the characteristics of small size, low energy consumption, safe use, simple and reliable, and high temperature control accuracy.

[0006] To achieve the above objectives, the electro-hydraulic servo valve torque motor output characteristic test device provided by the present invention can adopt the following technical solutions:

[0007] A device for testing the output characteristics of an electro-hydraulic servo valve torque motor comprises a thermal insulation chamber, a heater installed in the thermal insulation chamber, a torque motor fixed to a side wall of the thermal insulation chamber, a torque motor feedback rod coaxially connected to the torque motor output shaft and extending out of the side wall to the outside of the thermal insulation chamber, a laser displacement sensor for detecting the deflection movement of the torque motor feedback rod, a torque motor temperature sensor installed on the torque motor, a torque motor power supply located outside the thermal insulation chamber, a heater power supply connected to the heater, and a temperature controller.

[0008] Furthermore, the heater is an annular heating ring, and the thermal insulation cavity includes a left insulation pad and a right insulation pad. The left insulation pad and the right insulation pad are respectively sealed and installed on both sides of the heating ring and enclosed to form a hollow space. The torque motor is located in the space and fixed to the inner side of the left insulation pad or the right insulation pad; a left clamp is provided on the outer side of the left insulation pad; a right clamp is provided on the outer side of the right insulation pad; a left groove for accommodating the left insulation pad is provided on the inner side of the left clamp, and a right groove for accommodating the right insulation pad is provided on the inner side of the right clamp; the left clamp and the bottom of the right clamp are fixedly connected to each other.

[0009] Furthermore, the heater adopts a ceramic heating ring; the heater and the left and right insulation pads are connected and sealed with insulation sealing tape; the insulation sealing tape is made of Teflon material, and the left and right insulation pads are made of high-temperature resistant glass fiber material.

[0010] Furthermore, through holes are provided on the left clamp and the left thermal insulation pad to lead out the torque motor control wires and the temperature sensor signal acquisition wires, and to relieve the pressure of the hot air in the heating and insulation cavity.

[0011] Furthermore, the temperature controller is a PLC programmable controller, including a central processing unit, input and output I / O modules, a temperature acquisition A / D module, and a control output D / A module.

[0012] Furthermore, a small ball is provided at one end of the torque motor feedback rod extending out of the heating and insulation chamber, and a feedback rod ball fixture is installed on the small ball; a rectangular groove is provided on the feedback rod ball fixture, and the small ball is fixed in the rectangular groove; the laser beam emitted by the laser displacement sensor is irradiated onto the test plane on the feedback rod ball fixture.

[0013] The present invention also provides an electro-hydraulic servo valve torque motor output characteristic testing device. The working method can adopt the following technical solution, including the following steps:

[0014] S1: Install the right thermal insulation pad into the circular groove of the right clamp;

[0015] S2: Use the torque motor set screw to pass through the through hole on the right thermal insulation pad and connect it to the threaded hole on the right clamp, fixing the torque motor, the right thermal insulation pad and the right clamp as a whole. At the same time, the feedback rod on the torque motor passes through the through hole on the right thermal insulation pad and the through hole on the right clamp and extends to the outside;

[0016] S3: Insert the ball at the end of the feedback rod into the rectangular slot of the feedback rod ball fixture and tighten the fixture screw;

[0017] S4: Install and adjust the laser displacement sensor so that the laser beam emitted by the laser displacement sensor is irradiated onto the test plane on the feedback rod ball fixture;

[0018] S5: Install and fix the torque motor temperature sensor to the torque motor;

[0019] S6: Cover the heater on the outside of the torque motor, and lead the torque motor temperature sensor data line and the torque motor power line to the outside through the through hole on the left thermal insulation pad;

[0020] S7: Use thermal insulation sealing tape to connect the left thermal insulation pad, the heater, and the right thermal insulation pad together to form a heating and heat preservation cavity;

[0021] S8: Lead the torque motor temperature sensor data line and the torque motor power line to the outside through the through hole on the left fixture, and install and fix the left thermal insulation pad into the circular groove of the left fixture;

[0022] S9: The clamp set screw passes through the countersunk hole on the left clamp and is connected to the threaded hole on the right clamp, fixing the left clamp and the right clamp into one;

[0023] S10: Connect the data line of the torque motor temperature sensor to the temperature display;

[0024] S11: Connect the power cord of the torque motor to the torque motor power supply;

[0025] S12: Connect the power cord of the heater through the relay contacts on the temperature controller and connect it to the heater power supply;

[0026] S13: Connect the heater temperature sensor data line to the temperature controller;

[0027] S14: Set the heating temperature through the temperature controller, power on the heater, check the reading on the temperature display, and record the data when the displayed value stabilizes;

[0028] S15: Power on the torque motor power line, set the power signal, and the torque motor feedback rod deflects in the up and down directions, and records the data of the laser displacement sensor.

[0029] Beneficial effects:.

[0030] (1) Existing heating devices use high-temperature oil to heat the torque motor, resulting in low heating efficiency, a complex test system, and high cost. In contrast, the heater in the present invention uses a ceramic heating coil, which has high heating power, simple structure, small size, low cost, easy use, and is not prone to aging, and has a long service life.

[0031] (2) When a high-frequency control signal is input to the torque motor, the high-temperature oil in the existing heating device will create an additional damping effect on the torque motor armature assembly. In contrast, the present invention does not generate additional damping due to the absence of oil, which can improve the accuracy of the torque motor dynamic characteristics test.

[0032] (3) Existing heating devices typically expose the torque motor directly to air to measure the displacement of the armature assembly when heating the torque motor. This results in uneven heating of the torque motor during heating. In contrast, the present invention places the torque motor in a closed heating and insulation chamber, creating a uniform temperature field within the torque motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of a device for testing the output characteristics of an electro-hydraulic servo valve torque motor under a high temperature environment according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic structural diagram of a left clamp according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic structural diagram of a left thermal insulation pad according to an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the heater structure according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic structural diagram of the right thermal insulation pad according to an embodiment of the present invention;

[0038] Figure 6 This is a schematic structural diagram of the right clamp according to an embodiment of the present invention;

[0039] Figure 7 Schematic diagram of the torque motor feedback rod structure according to an embodiment of the present invention;

[0040] Figure 8 This is a structural diagram of a feedback rod ball clamp according to an embodiment of the present invention;

[0041] Figure 9 This is a structural diagram of the feedback rod ball clamp and the feedback rod in a clamped state according to an embodiment of the present invention;

[0042] Figure 10 This is a cross-sectional view of the feedback rod ball clamp and the feedback rod in the clamped state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] like Figure 1 The figure shows a device for testing the output characteristics of the torque motor of an electro-hydraulic servo valve under a high-temperature environment, including a heater power supply 1, a temperature controller 2, a torque motor temperature sensor 3, a temperature display 4, a torque motor power supply 5, a fixture fastening screw 6, a left fixture 7, a left thermal insulation pad 8, thermal insulation sealing tape 9, a heater 10, a heater temperature sensor 11, a right thermal insulation pad 12, a laser displacement sensor 13, a feedback rod ball fixture 14, a torque motor fastening screw 15, a right fixture 16, and a torque motor 17.

[0044] The heater 10 is a ring-shaped heating coil. The left insulation pad 8 and the right insulation pad 12 form a heat insulation cavity. The left insulation pad 8 and the right insulation pad 12 are respectively installed on both sides of the heating coil 10 and sealed to form a hollow space. The torque motor 17 is located in the space and fixed to the inner side of the left insulation pad 8 or the right insulation pad 12 ( Figure 1 The left clamp 7 has a left groove on its inner side for receiving the left insulation pad 8, while the right clamp 16 has a right groove on its inner side for receiving the right insulation pad 12. The left clamp 7 and the right clamp 16 are fixedly connected to each other at the bottom by the clamp set screw 6.

[0045] The thickness of the left and right thermal insulation pads 8, 12 is no less than 10 mm. They are made of high-temperature-resistant fiberglass. The thermal insulation sealing tape 9 is made of high-temperature-resistant Teflon. Through holes 7-2 and 8-1, with a diameter of no less than 4 mm, are provided on the left fixture 7 and left thermal insulation pad 8. These holes facilitate the routing of control wires for the torque motor 17 and the signal acquisition line for the torque motor temperature sensor 3, while also relieving the hot air within the heating and insulation chamber C1.

[0046] The right thermal insulation pad 12 is provided with through holes 12 - 1 and 12 - 2 .

[0047] The left clamp 7 is provided with a countersunk hole 7 - 3 .

[0048] The right clamp 16 is provided with a through hole 16 - 2 and threaded holes 16 - 3 and 16 - 4 .

[0049] A heater temperature sensor 11 is provided inside the heater 10 .

[0050] The diameter of the through hole 12 - 1 on the right thermal insulation pad 12 and the through hole 16 - 2 on the right clamp 16 is 1.5 to 2.5 times the diameter of the ball on the feedback rod.

[0051] The temperature controller 2 is a programmable logic controller (PLC) comprising a central processing unit (CPU), input and output I / O modules, a temperature acquisition A / D module, and a control output D / A module. The A / D module collects temperature signals from the heater temperature sensor 11 and converts the analog value into a digital value. The PLC reads the temperature data from the temperature acquisition module and, based on control rules, sends control parameters to the control output D / A module. The module converts the digital value into analog to control the opening and closing of a relay connected to the heater power line, thereby achieving temperature control.

[0052] Furthermore, the working method of the device for testing the output characteristics of the electro-hydraulic servo valve torque motor in a high temperature environment comprises the following steps:

[0053] S1: Install the right thermal insulation pad 12 into the circular groove 16-1 of the right clamp;

[0054] S2: Use the torque motor fastening screw 15 to pass through the through hole 12-2 on the right thermal insulation pad 12 and connect it to the threaded hole 16-3 on the right clamp 16, fixing the torque motor 17, the right thermal insulation pad 12, and the right clamp 16 as a whole. At the same time, the feedback rod 17-1 on the torque motor passes through the through hole 12-1 on the right thermal insulation pad 12 and the through hole 16-2 on the right clamp 16 and extends to the outside;

[0055] S3: Insert the ball 17-1-1 at the end of the feedback rod 17-1 into the rectangular slot 14-3 of the feedback rod ball fixture 14, and tighten the fixture screw 14-1;

[0056] S4: Install and adjust the laser displacement sensor 13 so that the laser beam emitted by the laser displacement sensor 13 is irradiated onto the test plane 14-2 on the feedback rod ball fixture 14;

[0057] S5: Install and fix the torque motor temperature sensor 3 to the torque motor 17;

[0058] S6: Cover the heater 10 on the outside of the torque motor 17, and at the same time lead the torque motor temperature sensor data line and the torque motor power line to the outside through the through hole 8-1 on the left thermal insulation pad 8;

[0059] S7: Use the thermal insulation sealing tape 9 to connect the left thermal insulation pad 8, the heater 10, and the right thermal insulation pad 12 together to form the heating and heat preservation chamber C1;

[0060] S8: Lead the torque motor temperature sensor data line and the torque motor power line to the outside through the through hole 7-2 on the left clamp, and install and fix the left thermal insulation pad 8 into the circular groove 7-1 of the left clamp 7;

[0061] S9: The clamp set screw 6 passes through the countersunk hole 7-3 on the left clamp 7 and is connected to the threaded hole 16-4 on the right clamp 16, fixing the left clamp 7 and the right clamp 16 as a whole;

[0062] S10: Connect the data line of the torque motor temperature sensor 3 to the temperature display 4;

[0063] S11: Connect the power line of the torque motor 17 to the torque motor power supply 5;

[0064] S12: Connect the power line of the heater 10 to the heater power supply 1 through the relay contact on the temperature controller 2;

[0065] S13: Connect the data line of the temperature sensor of the heater 10 to the temperature controller 2;

[0066] S14: Set the heating temperature through the temperature controller 2, power on the heater 10, check the reading on the temperature display 4, and record the data when the displayed value stabilizes;

[0067] S15: Power on the power line of the torque motor 17, set the power signal, and the torque motor feedback rod 17 - 1 deflects in the up and down directions, and records the data of the laser displacement sensor 13.

Claims

1. A device for testing the output characteristics of an electro-hydraulic servo valve torque motor, characterized in that: The invention comprises a heat-insulating chamber, a heater installed in the heat-insulating chamber, a torque motor fixed on a side wall of the heat-insulating chamber, a torque motor feedback rod coaxially connected to an output shaft of the torque motor and extending out of the side wall to the outside of the heat-insulating chamber, a laser displacement sensor for detecting deflection of the torque motor feedback rod, a torque motor temperature sensor installed on the torque motor, a torque motor power supply located outside the heat-insulating chamber, a heater power supply connected to the heater, and a temperature controller; The heater is an annular heating ring, and the heat insulation cavity includes a left insulation pad and a right insulation pad. The left insulation pad and the right insulation pad are respectively sealed and installed on both sides of the heating ring and enclosed to form a hollow space. The torque motor is located in the space and fixed to the inner side of the left insulation pad or the right insulation pad; a left clamp is provided on the outer side of the left insulation pad; a right clamp is provided on the outer side of the right insulation pad; a left groove for accommodating the left insulation pad is provided on the inner side of the left clamp, and a right groove for accommodating the right insulation pad is provided on the inner side of the right clamp; the bottom of the left clamp and the right clamp are fixedly connected to each other.

2. The electro-hydraulic servo valve torque motor output characteristic test device according to claim 1, characterized in that: The heater adopts a ceramic heating ring; the heater and the left and right thermal insulation pads are connected and sealed with thermal insulation sealing tape; the thermal insulation sealing tape is made of Teflon material, and the left and right thermal insulation pads are made of high-temperature resistant glass fiber material.

3. The electro-hydraulic servo valve torque motor output characteristic test device according to claim 2, characterized in that: The left clamp and the left thermal insulation pad are provided with through holes for leading out the torque motor control wires and the temperature sensor signal acquisition wires, and for depressurizing the hot air in the heating and heat preservation cavity.

4. The electro-hydraulic servo valve torque motor output characteristic test device according to claim 1, characterized in that: The temperature controller is a PLC programmable controller, which includes a central processing unit, input and output I / O modules, a temperature acquisition A / D module, and a control output D / A module.

5. The electro-hydraulic servo valve torque motor output characteristic test device according to claim 1, characterized in that: A small ball is provided at one end of the torque motor feedback rod extending out of the heating and insulation chamber, and a feedback rod ball fixture is installed on the small ball; a rectangular groove is provided on the feedback rod ball fixture, and the small ball is fixed in the rectangular groove; the laser beam emitted by the laser displacement sensor is irradiated onto the test plane on the feedback rod ball fixture.

6. A method for testing the output characteristics of an electro-hydraulic servo valve torque motor, characterized in that: The following steps are involved: S1: Install the right thermal insulation pad into the circular groove of the right clamp; S2: Use the torque motor set screw to pass through the through hole on the right thermal insulation pad and connect it to the threaded hole on the right clamp, fixing the torque motor, the right thermal insulation pad and the right clamp as a whole. At the same time, the feedback rod on the torque motor passes through the through hole on the right thermal insulation pad and the through hole on the right clamp and extends to the outside; S3: Insert the ball at the end of the feedback rod into the rectangular slot of the feedback rod ball fixture and tighten the fixture screw; S4: Install and adjust the laser displacement sensor so that the laser beam emitted by the laser displacement sensor is irradiated onto the test plane on the feedback rod ball fixture; S5: Install and fix the torque motor temperature sensor to the torque motor; S6: Cover the heater on the outside of the torque motor, and lead the torque motor temperature sensor data line and the torque motor power line to the outside through the through hole on the left thermal insulation pad; S7: Use thermal insulation sealing tape to connect the left thermal insulation pad, the heater, and the right thermal insulation pad together to form a heating and heat preservation cavity; S8: Lead the torque motor temperature sensor data line and the torque motor power line to the outside through the through hole on the left fixture, and install and fix the left thermal insulation pad into the circular groove of the left fixture; S9: The clamp set screw passes through the countersunk hole on the left clamp and is connected to the threaded hole on the right clamp, fixing the left clamp and the right clamp into one; S10: Connect the data line of the torque motor temperature sensor to the temperature display; S11: Connect the power cord of the torque motor to the torque motor power supply; S12: Connect the power cord of the heater through the relay contacts on the temperature controller and connect it to the heater power supply; S13: Connect the heater temperature sensor data line to the temperature controller; S14: Set the heating temperature through the temperature controller, power on the heater, check the reading on the temperature display, and record the data when the displayed value stabilizes; S15: Power on the torque motor power line, set the power signal, and the torque motor feedback rod deflects in the up and down directions, and records the data of the laser displacement sensor.

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