Electro-hydraulic proportional valve performance parameter detection circuit and test equipment

Abstract

The utility model discloses an electro-hydraulic proportional valve performance parameter detection circuit and test equipment, the electro-hydraulic proportional valve performance parameter detection circuit comprises a digital-to-analog conversion output card used for providing an analog voltage control signal; the constant current source generation circuit is connected with the digital-to-analog conversion output card and is used for receiving the analog voltage control signal to generate constant current and transmitting the constant current to the tested electro-hydraulic proportional valve for testing; the current acquisition circuit is connected with the constant current source generation circuit and is used for acquiring the electric signal generated by the constant current source generation circuit; a signal conditioning circuit; and an analog-to-digital conversion acquisition card. According to the utility model, necessary driving signals are provided for the electro-hydraulic proportional valve to ensure that the electro-hydraulic proportional valve operates according to preset conditions, and then signal changes generated in the test process of the voltage proportional valve are captured, so that various performance parameters of the electro-hydraulic proportional valve are measured, and test requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of electro-hydraulic proportional valve performance testing technology. More specifically, this utility model relates to a circuit and testing equipment for detecting the performance parameters of an electro-hydraulic proportional valve. Background Technology

[0002] Electro-hydraulic proportional valves, as key components in industrial applications, enable machine automation through electro-hydraulic proportional control technology, effectively reducing labor costs and significantly improving work efficiency. Their response speed, a crucial indicator of the accuracy of electro-hydraulic control systems, directly impacts the overall system performance. Furthermore, the lifespan and reliability of electro-hydraulic proportional valves not only determine the valve's own lifespan but also play a decisive role in the stability and safety of the entire hydraulic system. Given the importance of electro-hydraulic proportional valves in industrial production, testing their performance parameters is of paramount importance.

[0003] Existing technologies, such as the patent with authorization announcement number CN221857155U, disclose a control system for an electro-hydraulic proportional valve. This system uses a PWM wave duty cycle adjustment method to provide feedback on the controller's output current; it also uses pressure sensors to provide feedback on the actual valve opening size. However, this method requires installing sensors on the electro-hydraulic proportional valve, resulting in low testing efficiency and requiring improvement. Utility Model Content

[0004] This invention provides a circuit and testing equipment for detecting the performance parameters of an electro-hydraulic proportional valve. It can provide the necessary drive signals to the electro-hydraulic proportional valve to ensure that it operates under predetermined conditions. At the same time, by capturing the changes in electrical signals generated during the testing of the voltage proportional valve, it can measure its various performance parameters, meet the testing requirements, and achieve high testing efficiency.

[0005] To achieve these objectives and other advantages according to this utility model, a performance parameter detection circuit for an electro-hydraulic proportional valve is provided, comprising:

[0006] A digital-to-analog converter output card is used to provide analog voltage control signals;

[0007] A constant current source generating circuit, which is connected to the digital-to-analog converter output card, is used to receive the analog voltage control signal to generate a constant current and transmit the constant current to the electro-hydraulic proportional valve under test for testing.

[0008] A current acquisition circuit, which is connected to the constant current source generating circuit, is used to acquire the electrical signal generated by the constant current source generating circuit;

[0009] A signal conditioning circuit, which is connected to the current acquisition circuit, is used to adjust the intensity of the electrical signal;

[0010] An analog-to-digital converter (ADC) acquisition card is connected to the signal conditioning circuit and is used to convert the conditioned electrical signal into a digital signal.

[0011] Preferably, it also includes:

[0012] Instruction card, used to output control signals;

[0013] A signal amplification circuit, connected to the instruction card, is used to enhance the strength of the received control signal;

[0014] A drive coil circuit, which is connected to the signal amplification circuit and the electro-hydraulic proportional valve under test, is used to receive the enhanced control signal and provide an electrical signal to the valve coil of the electro-hydraulic proportional valve under test.

[0015] Preferably, the current acquisition circuit is connected to the drive coil circuit to acquire the electrical signal provided to the valve coil.

[0016] Preferably, it also includes:

[0017] Power signal generation card, used to generate power signals;

[0018] A relay control circuit, which is connected to the power signal production card, is used to receive the power signal and supply power to the electro-hydraulic proportional valve performance parameter testing equipment.

[0019] The voltage and current acquisition circuit is connected to the power signal generation card and the signal conditioning circuit, and is used to acquire the power signal and transmit it to the signal conditioning circuit.

[0020] Preferably, the constant current source generating circuit and the drive coil circuit are also connected to a heater and a thermistor. The constant current source generating circuit transmits the generated constant current to the heater and the thermistor. The drive coil circuit receives the enhanced control signal and provides an electrical signal to the heater and the thermistor.

[0021] Preferably, a power supply unit is provided, which is connected to the relay control circuit. The power supply unit includes a valve power supply module for powering the electro-hydraulic proportional valve under test, an auxiliary power supply module for powering the performance parameter detection circuit of the electro-hydraulic proportional valve, a heater power supply module for powering the heater, and a thermistor power supply module for powering the thermistor.

[0022] This utility model also provides a test device for the performance parameters of an electro-hydraulic proportional valve, including a chassis, wherein the above-mentioned electro-hydraulic proportional valve performance parameter detection circuit is provided in the chassis.

[0023] The top of the chassis is equipped with a handle, and one side wall is provided with a control panel. The control panel is connected to the electro-hydraulic proportional valve performance parameter detection circuit. The control panel integrates a port connected to the electro-hydraulic proportional valve under test, a heater terminal connected to the heater, and a thermistor terminal connected to the thermistor. The control panel is equipped with a display screen, and the other side wall of the chassis is provided with a ventilation opening.

[0024] Preferably, the control panel is connected to the electro-hydraulic proportional valve performance parameter detection circuit via a CPCI bus.

[0025] This invention offers at least the following advantages: The electro-hydraulic proportional valve performance parameter detection circuit of this invention provides a constant current to the electro-hydraulic proportional valve through the constant current source generating circuit. Combined with the current acquisition circuit, it collects the changes in electrical signals during the operation of the electro-hydraulic proportional valve in real time, thereby testing the performance parameters of the electro-hydraulic proportional valve. This eliminates the need for additional sensors on the electro-hydraulic proportional valve, effectively improving testing efficiency. The testing equipment based on the above-described electro-hydraulic proportional valve performance parameter detection circuit is compact and easy to transport.

[0026] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0027] Figure 1 This is a circuit diagram showing the connection between the electro-hydraulic proportional valve performance parameter detection circuit and the electro-hydraulic proportional valve in one of the technical solutions of this utility model.

[0028] Figure 2 This is a circuit diagram showing the connection between the electro-hydraulic proportional valve performance parameter detection circuit, the heater, and the thermistor in one of the technical solutions of this utility model.

[0029] Figure 3 This is a schematic diagram of the chassis structure in one of the technical solutions of this utility model;

[0030] Figure 4 This is a circuit diagram of a constant current source generator as described in one of the technical solutions of this utility model;

[0031] Figure 5 This is a circuit diagram of the current acquisition circuit described in one of the technical solutions of this utility model;

[0032] Figure 6 This is a signal conditioning circuit diagram according to one of the technical solutions of this utility model;

[0033] Figure 7This is a circuit diagram of the signal amplification circuit described in one of the technical solutions of this utility model. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0035] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0036] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] like Figures 1-7 As shown, the present invention provides a performance parameter detection circuit for an electro-hydraulic proportional valve, characterized in that it includes:

[0038] A digital-to-analog converter output card is used to provide analog voltage control signals;

[0039] A constant current source generating circuit, which is connected to the digital-to-analog converter output card, is used to receive the analog voltage control signal to generate a constant current and transmit the constant current to the electro-hydraulic proportional valve under test for testing.

[0040] A current acquisition circuit, which is connected to the constant current source generating circuit, is used to acquire the electrical signal generated by the constant current source generating circuit;

[0041] A signal conditioning circuit, which is connected to the current acquisition circuit, is used to adjust the intensity of the electrical signal;

[0042] An analog-to-digital converter (ADC) acquisition card is connected to the signal conditioning circuit and is used to convert the conditioned electrical signal into a digital signal.

[0043] In the above technical solution, the analog-to-digital (DA) output card is model Analog Devices AD5686, and the analog-to-digital (AD) acquisition card is model Analog Devices AD7799. The circuit diagrams of the constant current source generation circuit, current acquisition circuit, and signal conditioning circuit are shown below. Figure 4-6 The analog-to-digital converter (ADC) output card flexibly provides analog voltage control signals, which, together with the constant current source circuit, provide a stable and continuous current to the electro-hydraulic proportional valve. This creates a customized test environment for the valve under test, ensuring it operates according to predetermined conditions. Furthermore, the current acquisition circuit and signal conditioning circuit enable the AD acquisition card to capture key parameters such as voltage, current, and resistance in real time, achieving accurate measurement of the electro-hydraulic proportional valve's performance parameters. The electro-hydraulic proportional valve performance parameter detection circuit mainly includes a measurement and control calculation unit integrating test logic and control algorithms, and a signal conditioning unit for precise adjustment and preprocessing of sensor signals. The measurement and control calculation unit includes an ADC output card and an AD acquisition card, while the signal conditioning unit includes the constant current source circuit, current acquisition circuit, and signal conditioning circuit. The ADC output card is responsible for generating and sending precise control signals to drive the electro-hydraulic proportional valve to operate in a predetermined mode, ensuring that the valve can simulate actual working scenarios during testing, thereby accurately extracting key variables reflecting its performance. The analog-to-digital converter (AD) acquisition card can capture key parameters such as voltage, current, and resistance, as well as other electrical signals from the electro-hydraulic proportional valve in real time. The signal conditioning unit works closely with the measurement and control computing unit to jointly construct a customized testing environment for the electro-hydraulic proportional valve. Specifically, the constant current source circuit, guided by an analog voltage control signal, outputs a constant current to test the stability and performance of the electro-hydraulic proportional valve under constant current conditions. This step is crucial for evaluating the long-term operating capability of the electro-hydraulic proportional valve under specific operating conditions. The fixed current generated by the constant current source circuit provides a continuous current to the electro-hydraulic proportional valve, ensuring that the valve remains stable in a specific position. This is used to test the performance of the electro-hydraulic proportional valve under constant current conditions, such as stability and response speed, providing important evidence for evaluating its long-term operating capability. The current acquisition circuit is used to capture the electrical signals in the constant current source circuit in real time. These electrical signals are then finely processed by the signal conditioning circuit and converted into electrical signals suitable for AD (analog-to-digital conversion) channel acquisition. This process ensures the accuracy and reliability of the acquired data, laying a solid foundation for subsequent data processing and analysis.

[0044] Another technical solution also includes:

[0045] Instruction card, used to output control signals;

[0046] A signal amplification circuit, connected to the instruction card, is used to enhance the strength of the received control signal;

[0047] A drive coil circuit, which is connected to the signal amplification circuit and the electro-hydraulic proportional valve under test, is used to receive the enhanced control signal and provide an electrical signal to the valve coil of the electro-hydraulic proportional valve under test.

[0048] In this technical solution, the instruction card is a Texas Instruments (TI) CD74HC4067, and the signal amplification circuit diagram is shown below. Figure 7 The drive coil circuit uses existing circuitry. The signal amplification circuit amplifies the input control signal to ensure sufficient driving capability. The working valve core within the electro-hydraulic proportional valve shifts with the magnitude of the supplied current, changing the valve orifice size and thus providing pressure and flow output proportional to the input current. The instruction card generates pulse signals, enabling precise valve control through rapid switching operations, allowing the valve to open and close within specific time intervals. This process simulates the dynamic response characteristics of the electro-hydraulic proportional valve in practical applications, facilitating testing of its performance under constant flow conditions and resulting in more accurate test results.

[0049] In another technical solution, the current acquisition circuit is also connected to the drive coil circuit to acquire the electrical signal provided to the valve coil. In this technical solution, the current of the electro-hydraulic proportional valve changes during operation. When the valve opens or closes, the current in the coil changes. When the fluid load controlled by the valve (such as pressure or flow rate) changes, it also affects the magnitude of the current in the valve coil. For example, when the flow rate increases, the coil current increases to maintain the valve's response. By using the current acquisition circuit to monitor these current changes in real time and acquiring them through an AD acquisition card, parameters such as the flow response characteristics of the electro-hydraulic proportional valve can be measured.

[0050] Another technical solution also includes:

[0051] Power signal generation card, used to generate power signals;

[0052] A relay control circuit, which is connected to the power signal production card, is used to receive the power signal and supply power to the electro-hydraulic proportional valve performance parameter testing equipment.

[0053] A voltage and current acquisition circuit, connected to the power signal generation card and signal conditioning circuit, is used to acquire the power signal and transmit it to the signal conditioning circuit. In this technical solution, a power signal generation card disclosed in the prior art is used, and both the relay control circuit and the voltage and current acquisition circuit employ existing circuitry. The power signal generation card can generate specific power control signals to achieve precise control of the power supply unit. The relay control circuit is responsible for accurately monitoring the power supply voltage before powering on, ensuring accuracy before powering on the object under test. The voltage and current acquisition circuit is used to acquire key parameters of the power supply in real time, providing important basis for subsequent data analysis and fault diagnosis, and ensuring stable and safe power supply during the testing process.

[0054] In another technical solution, the constant current source circuit and drive coil circuit are also connected to a heater and a thermistor. The constant current source circuit transmits the generated constant current to the heater and the thermistor, and the drive coil circuit receives the enhanced control signal and provides electrical signals to the heater and the thermistor. In this technical solution, by connecting to the heater and thermistor, precise control of the power supply to 16 heaters and temperature data acquisition from 16 thermistors can be achieved, supporting comprehensive testing of the performance of the electro-hydraulic proportional valve under different temperature conditions.

[0055] In another technical solution, a power supply unit is provided, which is connected to the relay control circuit. The power supply unit includes a valve power supply module for the electro-hydraulic proportional valve under test, an auxiliary power supply module for the performance parameter detection circuit of the electro-hydraulic proportional valve, a heater power supply module for the heater, and a thermistor power supply module for the thermistor. In this technical solution, for the power supply requirements of the electro-hydraulic proportional valve, the valve power supply module can use a high-efficiency and stable GW Instek PSM-6003 programmable linear power supply, with a voltage range covering 0 to 60V and a current capability of 3.3A, ensuring that the power supply meets the high-precision testing requirements during the testing process. To improve the accuracy of signal sampling, reduce the interference and error of power supply noise on the test results, and facilitate the self-testing and calibration of the power supply equipment, the auxiliary power supply module preferentially adopts a linear power supply scheme, such as the Chaoyang power supply module. The heater power supply module uses the GW Instek PSH-3610 programmable switching power supply, whose wide voltage range (0-36V) and current capability (0-10A) fully meet the working requirements of 16 heaters. For temperature testing of the thermistors, the thermistor power supply module uses a stable +5V Chaoyang linear power supply to ensure the accuracy of temperature measurement.

[0056] This utility model also provides a performance parameter testing device for an electro-hydraulic proportional valve, including a chassis 100, wherein the chassis 100 is provided with the above-mentioned electro-hydraulic proportional valve performance parameter detection circuit.

[0057] The top of the chassis 100 is equipped with a handle 101, and a control panel is provided on one side wall. The control panel is connected to the electro-hydraulic proportional valve performance parameter detection circuit. The control panel integrates a port connected to the electro-hydraulic proportional valve under test, a heater terminal connected to the heater, and a thermistor terminal connected to the thermistor. The control panel is equipped with a display screen, and a ventilation opening 102 is provided on the other side wall of the chassis.

[0058] In this technical solution, the chassis 100, serving as the main support structure of the entire testing equipment, is designed in a cuboid shape to provide a stable support platform. The ADLINK cPCIS-2501 chassis can be selected, providing six CPCI bus slots for easy connection to the electro-hydraulic proportional valve performance parameter detection circuit. A handle 101 is provided on the top of the chassis 100 for easy portability. A ventilation opening 102 is located on the lower side of one side of the chassis 100 to ensure good heat dissipation inside the equipment. A control panel is designed on the other side, integrating ports for connecting to the electro-hydraulic proportional valve, heater terminals for connecting to the heater, and thermistor terminals for connecting to the thermistor. This allows for convenient control of the detection circuit to comprehensively test various performance parameters of the valve. The human-machine interface on the control panel provides operators with an intuitive operating experience, while the equipped display screen shows the current test status in real time, ensuring that operators can quickly identify and understand the performance parameter test results of the electro-hydraulic proportional valve.

[0059] In another technical solution, the control panel is connected to the electro-hydraulic proportional valve performance parameter detection circuit via a CPCI bus. In this technical solution, the testing equipment adopts an advanced CPCI (CompactPCI) bus structure in its hardware architecture, a design that gives the equipment advantages such as robustness, reliability, ease of expansion, and high-speed transmission.

[0060] This utility model describes a performance parameter testing device for electro-hydraulic proportional valves, specifically designed for the precise measurement and analysis of various key performance parameters (including but not limited to current, voltage, dynamic resistance, and flow response characteristics) of electro-hydraulic proportional valves. Through a wired connection, the device can capture various data from the electro-hydraulic proportional valve in real time during operation and efficiently transmit them to the monitoring host database for storage and analysis. The core of the device lies in its highly integrated electro-hydraulic proportional valve performance parameter detection circuit. In this system, the DA output card and instruction card accurately generate control signals, while the constant current source circuit and signal amplification circuit provide precise drive circuitry for the electro-hydraulic proportional valve, ensuring that the valve can simulate actual working scenarios during testing. The current acquisition circuit then accurately extracts key variables reflecting the performance parameters of the electro-hydraulic proportional valve. These variables are processed by the signal conditioning circuit and converted into digital signals by a high-sensitivity AD acquisition card before being transmitted to the monitoring host. The device also integrates power-on / off control functions for the heater and thermistor, supporting comprehensive testing of the electro-hydraulic proportional valve's performance under different temperature conditions. This feature allows the equipment to be more closely aligned with real-world application scenarios, providing a more comprehensive and reliable testing solution for the research, development, production, and quality control of electro-hydraulic proportional valves. The characteristic parameters that need to be monitored include the current and voltage during startup and release processes and their precise timing recording, the current and voltage stability assessment under steady-state operating conditions, and the measurement of the current reserve coefficient. Furthermore, the equipment can accurately measure the heater resistance, the sensitivity of the thermistor (or thermocouple), and the coil resistance; these parameters are crucial for ensuring the stable operation of electro-hydraulic proportional valves under different operating conditions.

[0061] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0062] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A circuit for detecting performance parameters of an electro-hydraulic proportional valve, characterized in that, include: A digital-to-analog converter output card is used to provide analog voltage control signals; A constant current source generating circuit, which is connected to the digital-to-analog converter output card, is used to receive the analog voltage control signal to generate a constant current and transmit the constant current to the electro-hydraulic proportional valve under test for testing. A current acquisition circuit, which is connected to the constant current source generating circuit, is used to acquire the electrical signal generated by the constant current source generating circuit; A signal conditioning circuit, which is connected to the current acquisition circuit, is used to adjust the intensity of the electrical signal; An analog-to-digital converter (ADC) acquisition card, which is connected to the signal conditioning circuit, is used to convert the conditioned electrical signal into a digital signal.

2. The electro-hydraulic proportional valve performance parameter detection circuit as described in claim 1, characterized in that, Also includes: Instruction card, used to output control signals; A signal amplification circuit, connected to the instruction card, is used to enhance the strength of the received control signal; The drive coil circuit, which is connected to the signal amplification circuit and the electro-hydraulic proportional valve under test, is used to receive the enhanced control signal and provide an electrical signal to the valve coil of the electro-hydraulic proportional valve under test.

3. The electro-hydraulic proportional valve performance parameter detection circuit as described in claim 2, characterized in that, The current acquisition circuit is connected to the drive coil circuit and is used to acquire the electrical signal provided to the valve coil.

4. The electro-hydraulic proportional valve performance parameter detection circuit as described in claim 3, characterized in that, Also includes: Power signal generation card, used to generate power signals; A relay control circuit, which is connected to the power signal production card, is used to receive the power signal and supply power to the electro-hydraulic proportional valve performance parameter testing equipment. The voltage and current acquisition circuit is connected to the power signal generation card and the signal conditioning circuit, and is used to acquire the power signal and transmit it to the signal conditioning circuit.

5. The electro-hydraulic proportional valve performance parameter detection circuit as described in claim 4, characterized in that, The constant current source generating circuit and the drive coil circuit are also connected to a heater and a thermistor. The constant current source generating circuit transmits the generated constant current to the heater and the thermistor. The drive coil circuit receives the enhanced control signal and provides an electrical signal to the heater and the thermistor.

6. The electro-hydraulic proportional valve performance parameter detection circuit as described in claim 5, characterized in that, A power supply unit is provided, which is connected to the relay control circuit. The power supply unit includes a valve power supply module for powering the electro-hydraulic proportional valve under test, an auxiliary power supply module for powering the performance parameter detection circuit of the electro-hydraulic proportional valve, a heater power supply module for powering the heater, and a thermistor power supply module for powering the thermistor.

7. A device for testing the performance parameters of an electro-hydraulic proportional valve, characterized in that, Includes a chassis, wherein the chassis is provided with an electro-hydraulic proportional valve performance parameter detection circuit as described in any one of claims 1-6; The top of the chassis is equipped with a handle, and one side wall is provided with a control panel. The control panel is connected to the electro-hydraulic proportional valve performance parameter detection circuit. The control panel integrates a port connected to the electro-hydraulic proportional valve under test, a heater terminal connected to the heater, and a thermistor terminal connected to the thermistor. The control panel is equipped with a display screen, and the other side wall of the chassis is provided with a ventilation opening.

8. The electro-hydraulic proportional valve performance parameter testing equipment as described in claim 7, characterized in that, The control panel is connected to the electro-hydraulic proportional valve performance parameter detection circuit via a CPCI bus.

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