Valve core steady-state hydraulic force detection device and method based on hydraulic force compensation

Abstract

The application discloses a valve core steady-state hydraulic force detection device and method based on hydraulic pressure compensation. The device comprises: a first output end of an adjusting unit is connected with a valve to be detected through a plurality of pressure sensors; a plurality of proportional relief valves are connected in parallel on a connecting line between a second output end of the adjusting unit and a pressure compensation cylinder; a valve core of the valve to be detected, the pressure compensation cylinder, a tension and pressure sensor and a driving unit are connected in sequence; and a controller is in communication connection with each device. The adjusting unit is used for adjusting a loading pressure grade of the valve to be detected, and the driving unit is used for adjusting a valve core detection position of the valve to be detected. The controller is used for adjusting opening pressures of the plurality of proportional relief valves to control the pressure compensation cylinder to compensate the hydraulic pressure of the valve core, and determine the relationship between the valve core hydraulic force and the valve core position under different loading pressure grades. The device improves the accuracy of the valve core steady-state hydraulic force detection, and can be suitable for detecting various types of valve cores.

Description

Technical Field

[0001] This application relates to the field of hydraulic valve testing technology, and in particular to a device and method for detecting the steady-state hydrodynamics of a valve core based on hydraulic pressure compensation. Background Technology

[0002] Currently, various types of hydraulic valves are widely used in various fields. The steady-state hydraulic force of a hydraulic valve refers to the force generated when the valve opening is constant (i.e., the liquid is flowing steadily), due to the change in the cross-sectional area and direction of the liquid flow through the valve cavity and valve orifice, which causes a change in the liquid flow velocity, and thus a change in the liquid flow rate.

[0003] The steady-state hydrodynamic force, also known as the dynamic reaction force, can be decomposed into axial and lateral components. Since the oil chambers of the valve body are typically symmetrically positioned around the valve core, the lateral components along the circumference of the valve core cancel each other out, while the axial component causes the valve core to tend towards closure. Therefore, to ensure the normal operation of the hydraulic valve, it is necessary to monitor the steady-state hydrodynamic force and take appropriate measures.

[0004] In related technologies, when performing steady-state hydrodynamic testing of hydraulic valves, the indirect detection method using valve core force formulas or the indirect detection method using tension / compression sensors is typically employed. A pressure sensor is installed at a corresponding position on the valve core, and the pressure data detected by the sensor is substituted into relevant formulas to calculate the valve core hydrodynamic force of the valve under test.

[0005] However, the detection schemes in the aforementioned related technologies rely on indirect calculations using formulas. When other forces are applied to the system, the error becomes uncontrollable. Furthermore, most measurement systems have inertia, and valve core fluctuations reduce test accuracy, resulting in low precision and reliability of the calculated results. Moreover, these schemes can only detect a limited type of valve core and are not suitable for testing valve cores of various sizes and specifications. Summary of the Invention

[0006] The purpose of this application is to at least partially solve one of the aforementioned technical problems.

[0007] Therefore, the first objective of this application is to propose a valve core steady-state hydrodynamic testing device based on hydraulic pressure compensation. This device considers the influence of various factors such as friction during the testing process and compensates for the hydraulic pressure of the valve under test through a pressure compensation cylinder. This improves the accuracy of steady-state hydrodynamic testing of the valve core and is applicable to the testing of various types of valve cores.

[0008] The second objective of this application is to propose a method for detecting steady-state hydrodynamic forces of valve cores based on hydraulic pressure compensation.

[0009] The third objective of this application is to provide a non-transitory computer-readable storage medium.

[0010] To achieve the above objectives, the first aspect of this application proposes a valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation. This device includes: an adjustment unit, multiple proportional relief valves, multiple pressure sensors, a drive unit, tension / compression sensors, a pressure compensation cylinder, and a controller.

[0011] The first output terminal of the regulating unit is connected to the valve under test through the plurality of pressure sensors. The plurality of proportional relief valves are respectively connected in parallel on the connection line between the second output terminal of the regulating unit and the pressure compensation cylinder. The valve core of the valve under test, the pressure compensation cylinder, the tension and pressure sensors and the drive unit are connected in sequence. The controller establishes a communication connection with each device.

[0012] The adjustment unit is used to adjust the loading pressure level of the valve under test, the drive unit is used to adjust the valve core detection position of the valve under test, and the multiple pressure sensors are used to collect the pressure signal of the valve under test under different detection states.

[0013] The controller is used to adjust the opening pressure of the plurality of proportional relief valves according to the received data, so as to control the pressure compensation cylinder to compensate the valve core hydraulic pressure, and to determine the relationship between the valve core hydraulic power and the valve core position under different loading pressure levels based on the data collected by the tension and pressure sensors after hydraulic compensation.

[0014] In addition, the valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation according to the embodiments of this application also has the following additional technical features:

[0015] Optionally, in some embodiments, the regulating unit includes: multiple metering pumps, multiple variable frequency motors, multiple return liquid shut-off valves, and a first proportional relief valve, wherein each variable frequency motor is connected to a corresponding metering pump via a coupling, and the oil outlet of each metering pump is connected to the first end of the corresponding return liquid shut-off valve; the oil outlet of the first metering pump is connected to the first end of the first return liquid shut-off valve and then connected in parallel with the first proportional relief valve.

[0016] Optionally, in some embodiments, the regulating unit further includes: a first reversing valve and a second reversing valve, wherein the second end of the first return liquid shut-off valve is connected to the first reversing valve, and the working oil port of the first reversing valve is connected to the inlet and return liquid port of the valve under test, respectively; the second end of the second return liquid shut-off valve is connected to the second reversing valve, and the working oil port of the second reversing valve is connected to the left and right working chambers of the pressure compensation cylinder, respectively.

[0017] Optionally, in some embodiments, the device further includes: a flow meter, wherein a first pressure sensor, a second pressure sensor, and the flow meter are respectively connected to the connection line between the working port of the first directional valve and the valve under test; a second proportional relief valve is connected in parallel to the connection line between the working port of the second directional valve and the left actuating chamber, and a third proportional relief valve is connected in parallel to the connection line between the working port of the second directional valve and the right actuating chamber; the output end of the second proportional relief valve is also connected to the third pressure sensor, and the output end of the third proportional relief valve is also connected to the fourth pressure sensor.

[0018] Optionally, in some embodiments, the device further includes: a displacement sensor, wherein the valve core of the valve under test is connected to the left piston rod of the pressure compensation cylinder via a first connecting bolt, the right piston rod of the pressure compensation cylinder is connected to the first end of the tension / compression sensor via a second connecting bolt, the second end of the tension / compression sensor is connected to the first end of the drive unit via a third connecting bolt, and the second end of the drive unit is connected to the displacement sensor; the displacement sensor is used to detect the position of the valve core of the valve under test.

[0019] Optionally, in some embodiments, the device further includes a host computer, the controller being connected to the host computer, the host computer being used to plot a graph of the magnitude of the hydraulic force of the valve core and the position of the valve core under different loading pressure levels based on the data transmitted by the controller.

[0020] To achieve the above objectives, a second aspect of the present invention provides a method for detecting steady-state hydrodynamic forces of a valve core based on hydraulic pressure compensation. This method is applied to the valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation described in the first aspect. The method includes:

[0021] Step S101: Adjust the loading pressure level of the valve under test to the initial pressure level through the adjustment unit, and adjust the valve core of the valve under test to the initial detection position through the drive unit;

[0022] Step S102: Calculate the valve core hydraulic pressure information under the current detection state based on the valve core position signal and the pressure signals collected by multiple pressure sensors;

[0023] Step S103: Based on the valve core fluid pressure information, the pressure compensation cylinder is controlled to compensate the valve core fluid pressure by adjusting the opening pressure of the plurality of proportional relief valves, and the readings of the tension and pressure sensors are recorded.

[0024] Step S104: Adjust the valve core detection position of the valve under test through the drive unit, and repeat steps S102 to S103 to determine the relationship between the valve core hydraulic force and the valve core position under the current loading pressure level based on the reading of the tension and compression sensor.

[0025] Step S105: Adjust the loading pressure level of the valve under test through the adjustment unit, and repeat steps S102 to S104 to determine the relationship between the valve core hydraulic force and the valve core position under different loading pressure levels.

[0026] In addition, the valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation in this application embodiment also has the following additional technical features:

[0027] Optionally, in some embodiments, adjusting the loading pressure level of the valve under test to the initial pressure level via the adjustment unit includes: adjusting the output flow rate of the first metering pump to be greater than the nominal flow rate of the valve under test by controlling the rotation speed of the first variable frequency motor; adjusting the output flow rate of the second metering pump to the target flow rate by controlling the rotation speed of the second variable frequency motor to stabilize the opening pressure of the second proportional relief valve and the third proportional relief valve; controlling the first reversing valve to reverse and adjusting the opening pressure of the first proportional relief valve until the reading of the second pressure sensor reaches the preset pressure value.

[0028] Optionally, in some embodiments, the step of calculating the valve core fluid pressure information under the current detection state based on the valve core position signal and the pressure signals collected by multiple pressure sensors includes: inputting the valve core position signal under the current detection state, as well as the pressure signals collected by the first pressure sensor and the second pressure sensor, into a preset valve port structure network model; and calculating the valve core fluid pressure value and valve core fluid pressure direction under the current detection state through the valve port structure network model.

[0029] To achieve the above objectives, a third aspect of the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation as described in any of the second aspect embodiments above.

[0030] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0031] This application uses a pressure compensation cylinder to compensate for the pressure of the tested valve fluid. Data collected by the tension / compression sensor does not require secondary processing, resulting in more accurate test results. This application employs a follow-up testing method, with the drive unit rigidly connecting the valve core and the pressure compensation cylinder. Continuous and interval testing are possible. During interval steady-state testing, the valve core exhibits no movement tendency, offsetting the influence of friction on the test. During continuous testing, the resultant force of the steady-state hydrodynamic force and hydraulic force of the valve core can be pre-calibrated, and a corresponding proportional relief valve can be controlled to input a DC polarized current for resultant force compensation, further improving the accuracy of the test. Furthermore, this application can test various types of valve cores. Overcompensation or undercompensation can be performed through the pressure compensation cylinder, preventing excessive hydraulic force levels from exceeding the range of the tension / compression sensor. This reduces the limitations of steady-state hydrodynamic testing on the tension / compression sensor, improving the applicability, reliability, and accuracy of steady-state hydrodynamic testing. It also boasts a high degree of automation and is easy to implement.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0034] Figure 1 This is a schematic diagram of the structure of a valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation proposed in an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of the structure of a specific valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation, as proposed in an embodiment of this application.

[0036] Figure 3 This is a schematic diagram illustrating the working principle of a specific valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation, as proposed in an embodiment of this application.

[0037] Figure 4 The flowchart is a method for detecting steady-state hydrodynamic forces of a valve core based on hydraulic pressure compensation, as proposed in an embodiment of this application.

[0038] Figure 5 This is a flowchart illustrating a specific method for detecting steady-state hydrodynamic forces of a valve core based on hydraulic pressure compensation, as proposed in an embodiment of this application. Detailed Implementation

[0039] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0040] It should be noted that in the first related embodiment using the indirect detection method with tension and compression sensors, the resultant force F on the valve core is measured by the tension and compression sensors, the pressure p at the return port of the valve body is measured by the pressure transmitter, and then the hydraulic force Y is calculated using the following formula: Y = F + p × S, where S represents the cross-sectional area of ​​the valve core.

[0041] In the second related embodiment, the indirect detection method using the valve core force formula is implemented. Hydraulic oil is supplied to the hydraulic pipe via a hydraulic oil supply system. The displacement adjustment unit is then controlled to indirectly drive the valve core to move a preset displacement to the right relative to the valve sleeve, reading the detection data from the two pressure sensors as F11 and F21. The displacement adjustment unit is also controlled to indirectly drive the valve core to move a preset displacement to the left relative to the valve sleeve, reading the detection data from the two pressure sensors as F12 and F22. The valve core hydraulic force of the valve under test is then calculated using the formula F = [F11 + F12 - F21 - F22] ÷ 2.

[0042] However, the calculation method in the above scheme is an indirect calculation using formulas. When the system is under stress, the error is uncontrollable, and most measurement systems have inertia. Valve core fluctuations reduce the test accuracy. Furthermore, the accuracy of formula calculations is low, and the types of valve cores that can be tested are limited, with insufficient coverage of valve core specifications and dimensions. Therefore, this application proposes a valve core steady-state hydrodynamic testing device and method based on hydraulic pressure compensation to improve the accuracy of valve core steady-state hydrodynamic testing and to be applicable to the testing of various types of valve cores.

[0043] The following describes, with reference to the accompanying drawings, a valve core steady-state hydrodynamic detection device and method based on hydraulic pressure compensation, according to embodiments of this application.

[0044] Figure 1 This is a schematic diagram of the structure of a valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation, as proposed in an embodiment of this application. Figure 1 As shown, the device includes: an adjustment unit 100, multiple proportional relief valves 200, multiple pressure sensors 300, a drive unit 400, a tension / compression sensor 500, a pressure compensation cylinder 600, and a controller 700.

[0045] In this system, the first output terminal of the regulating unit 100 is connected to the valve under test through multiple pressure sensors 300, and multiple proportional relief valves 200 are connected in parallel on the connection line between the second output terminal of the regulating unit 100 and the pressure compensation cylinder 600. The valve core of the valve under test, the pressure compensation cylinder 600, the tension and pressure sensors 500 and the drive unit 400 are connected in sequence, and the controller 700 establishes a communication connection with each device.

[0046] The adjustment unit 100 is used to adjust the loading pressure level of the valve under test, the drive unit 400 is used to adjust the valve core detection position of the valve under test, and multiple pressure sensors 300 are used to collect the pressure signal of the valve under test under different detection states.

[0047] The controller 700 is used to adjust the opening pressure of multiple proportional relief valves 200 according to the received data, so as to control the pressure compensation cylinder 600 to compensate the valve core hydraulic pressure, and to determine the relationship between the valve core hydraulic power and the valve core position under different loading pressure levels based on the data collected by the tension and pressure sensor 500 after hydraulic compensation.

[0048] The first and second output terminals of the adjustment unit 100 can be connected to multiple lines. Figure 1 (Two examples are provided below) Connect to the corresponding ports of the relevant devices, which will be explained in detail later.

[0049] Specifically, the valve under test is a hydraulic valve that requires steady-state hydrodynamic testing. The regulating unit 100 is used to adjust the pressure and flow rate of the valve under test during the testing process. The regulating unit 100 can adjust the loading pressure level of the valve under test at the valve port. The drive unit can adjust the position of the valve core of the valve under test so that the valve core is stably located at multiple test points. Therefore, by adjusting the loading pressure level and the valve core detection position, this application can change the testing conditions and perform steady-state hydrodynamic testing under different testing states.

[0050] Furthermore, this application also includes a pressure compensation cylinder. By compensating for the pressure of the valve fluid under test using the pressure compensation cylinder, the influence of other forces on the valve core and friction during valve core movement, as well as various other factors, on the detection can be reduced. Accurate detection can be performed after hydraulic compensation, further improving the accuracy of the detection.

[0051] In practical implementation, the various devices and connection methods included in the detection apparatus of this application can be adaptively adjusted according to actual detection needs, and this application does not impose any limitations on this. To more clearly illustrate the structure and operation of the valve core steady-state hydrodynamic detection apparatus based on hydraulic pressure compensation of this application, the following is an exemplary description of a specific detection apparatus proposed in one embodiment of this application.

[0052] Figure 2This is a schematic diagram of a specific valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation, as proposed in an embodiment of this application. Figure 2 As shown, the device includes: multiple metering pumps, multiple variable frequency motors, multiple return liquid shut-off valves, multiple proportional relief valves, multiple pressure sensors, multiple connecting bolts, multiple directional valves, displacement sensors, drive units, tension and pressure sensors, flow meters, valves under test, pressure compensation cylinders, controllers, and host computers.

[0053] Among them, such as Figure 2 As shown, multiple metering pumps include a first metering pump 11 and a second metering pump 12; multiple variable frequency motors include a first variable frequency motor 21 and a second variable frequency motor 22; multiple return liquid shut-off valves include a first return liquid shut-off valve 31 and a second return liquid shut-off valve 32; multiple proportional relief valves include a first proportional relief valve 41, a second proportional relief valve 42, and a third proportional relief valve 43; multiple pressure sensors include a first pressure sensor 51, a second pressure sensor 52, a third pressure sensor 53, and a fourth pressure sensor 54; and multiple directional valves include a first directional valve 71 and a second directional valve 72.

[0054] In this embodiment, the first metering pump 11, the second metering pump 12, the first variable frequency motor 21, the second variable frequency motor 21, the first return liquid shut-off valve 31, the second return liquid shut-off valve 32, the first proportional overflow valve 41, the first reversing valve 71 and the second reversing valve 72 correspond to the regulating unit 100 in the above embodiment, and can be regarded as the regulating unit 100 including the above-mentioned devices.

[0055] Specifically, each variable frequency motor is connected to the corresponding fixed displacement pump via a coupling, and the oil outlet of each fixed displacement pump is connected to the first end of the corresponding return liquid shut-off valve. Specifically, the oil outlet of the first fixed displacement pump 11 is connected to the first end of the first return liquid shut-off valve 31 and then connected in parallel with the first proportional relief valve 41. That is, the downstream of the first return liquid shut-off valve is connected in parallel with the first proportional relief valve 41. The first end of the first proportional relief valve 41 is connected to the first end of the first fixed displacement pump 11, and the second end of the first proportional relief valve 41 is connected to the second end of the first return liquid shut-off valve.

[0056] In this embodiment, the second end of the first return circuit breaker valve 31 is connected to the first directional control valve 71, and the working port of the first directional control valve 71 is connected to the inlet and return port of the valve under test, respectively. The second end of the second return circuit breaker valve 32 is connected to the second directional control valve 72, and the working port of the second directional control valve 72 is connected to the left and right working chambers of the pressure compensation cylinder 13, respectively. That is, the downstream of the first return circuit breaker valve 31 is connected in series with the first directional control valve 71, the working port of the first directional control valve 71 is connected to the inlet and return port of the valve under test 120, and the working port of the second directional control valve 72 is connected to the left and right working chambers of the pressure compensation cylinder 13.

[0057] Continue to refer to Figure 2 For example, the steady-state hydrodynamic detection device also includes a flow meter 110, wherein the first pressure sensor 51, the second pressure sensor 52 and the flow meter 110 are respectively connected to the connection line between the working port of the first directional valve 71 and the valve 120 to be tested; the second proportional relief valve 42 is connected in parallel to the connection line between the working port of the second directional valve 72 and the left working chamber, and the third proportional relief valve 43 is connected in parallel to the connection line between the working port of the second directional valve 72 and the right working chamber; the output end of the second proportional relief valve 42 is also connected to the third pressure sensor 53, and the output end of the third proportional relief valve 43 is also connected to the fourth pressure sensor 54.

[0058] Specifically, the working port of the second directional valve 72 is connected to the left and right working chambers of the pressure compensation cylinder 13. The second proportional relief valve 42 and the third proportional relief valve 43 are connected in parallel between the working port of the second directional valve 72 and the left and right working chambers of the pressure compensation cylinder 13, respectively. The third pressure sensor 53 and the fourth pressure sensor 54 are connected upstream of the second proportional relief valve 42 and the third proportional relief valve 43, respectively. That is, the third pressure sensor 53 is connected to the connection line between the output end of the second proportional relief valve 42 and the left working chamber, and the fourth pressure sensor 54 is connected to the connection line between the output end of the third proportional relief valve 43 and the right working chamber.

[0059] Continue to refer to Figure 2 For example, the steady-state hydrodynamic detection device also includes a displacement sensor 8. The valve core of the valve under test 120 is connected to the left piston rod of the pressure compensation cylinder 13 via a first connecting bolt 61. The right piston rod of the pressure compensation cylinder 13 is connected to the first end of the tension / compression sensor 10 via a second connecting bolt 62. The second end of the tension / compression sensor 10 is connected to the first end of the drive unit 9 via a third connecting bolt 63. The second end of the drive unit 9 is connected to the displacement sensor 8. This displacement sensor 8 is used to detect the position of the valve core of the valve under test, thereby verifying and determining the adjusted position after each adjustment of the valve core detection position of the valve under test 120.

[0060] Continue to refer to Figure 2 For example, controller 14 communicates with the various devices described above. Figure 2 The dashed lines represent the communication lines established between the controller 14 and various devices. Each device can send the collected data to the controller 14, thereby transmitting all sensor data to the controller 14, which facilitates subsequent detection of the steady-state hydrodynamic force of the valve core based on the relevant sensor data.

[0061] Furthermore, the detection device in this embodiment also includes a host computer 15, and the controller 14 is connected to the host computer 15. The host computer 15 is used to draw a graph of the magnitude of the hydraulic force of the valve core and the position of the valve core under different loading pressure levels based on the data transmitted by the controller 14.

[0062] Specifically, in this embodiment, the controller 14 and the host computer 15 can exchange data. The controller 14 can calculate the mapping relationship between the magnitude of the valve core hydraulic power and the valve core position under different loading pressure levels using its internal preset algorithms based on the collected sensor data. The calculated relationship is then sent to the host computer 15, which uses relevant programs to plot a graph showing the relationship between the valve core hydraulic power and the valve core position under different pressure levels. For example, a curve showing the relationship can be drawn on a coordinate axis with the valve core position as the x-axis and the valve core hydraulic power as the y-axis. The graph can be switched to different pressure levels and then displayed on a display device. Alternatively, the controller 14 can send the collected sensor data to the host computer 15, which then performs relationship calculations and graph generation, reducing the workload of the controller 14. In this embodiment, the control commands for each device in the detection device, such as the detection position adjustment command issued by the drive unit, are all issued by the controller 14. The controller 14 can generate the relevant commands, or the host computer 15 can automatically generate or receive the control commands input by the user and then send the control commands to the controller 14.

[0063] Therefore, through the valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation of this application, based on Figure 3 The detection principle shown can generate a graph of the magnitude of the hydraulic force of the valve core and the position of the valve core under different pressure levels. By obtaining the graph information, the specific value of the magnitude of the hydraulic force of the valve core can be detected under the detection state corresponding to a certain loading pressure level and valve core position.

[0064] In summary, the valve core steady-state hydrodynamic testing device based on hydraulic pressure compensation implemented in this application uses a pressure compensation cylinder to compensate for the hydraulic pressure of the valve under test. Data collected by the tension / compression sensors does not require secondary processing, resulting in more accurate test results. This device uses a follow-up testing method, with the drive unit rigidly connecting the valve core and the pressure compensation cylinder. It can perform continuous and interval tests. During interval steady-state testing, the valve core exhibits no movement tendency, offsetting the influence of friction on the test. During continuous testing, the resultant force of the valve core's steady-state hydrodynamic force and hydraulic pressure can be pre-calibrated, and a corresponding proportional relief valve can be controlled to input a DC polarized current for resultant force compensation, further improving the accuracy of the test. Furthermore, this device can test various types of valve cores. Overcompensation or undercompensation can be performed through the pressure compensation cylinder, preventing excessive hydraulic force levels from exceeding the range of the tension / compression sensors. This reduces the limitations of steady-state hydrodynamic testing on the tension / compression sensors, improves the applicability and reliability of steady-state hydrodynamic testing, has a high degree of automation, and is easy to implement.

[0065] To more clearly illustrate the specific implementation process of steady-state hydrodynamic detection using the valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation of this application, a valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation proposed in the embodiments of this application will be described in detail below. This method is applied to the valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation in the above embodiments. That is, this valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation uses the valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation in the above embodiments to perform relevant control operations on the device to achieve detection. The components included in the device and the connection methods of each component are as described in the above embodiments. The relevant equipment involved in this method, that is, the corresponding equipment in the above device embodiments, will not be described again here.

[0066] Figure 4 This is a flowchart of a valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation proposed in an embodiment of this application, as shown below. Figure 4 As shown, the method includes the following steps:

[0067] Step S101: Adjust the loading pressure level of the valve under test to the initial pressure level through the adjustment unit, and adjust the valve core of the valve under test to the initial detection position through the drive unit.

[0068] Specifically, the valve under test is loaded to the initial pressure level, and the valve core of the valve under test is adjusted to stabilize at the initial detection position.

[0069] In one embodiment of this application, adjusting the loading pressure level of the valve under test to the initial pressure level by adjusting the unit includes the following steps: First, by controlling the speed of the first variable frequency motor, the output flow rate of the first metering pump is adjusted to be greater than the nominal flow rate of the valve under test; then, by controlling the speed of the second variable frequency motor, the output flow rate of the second metering pump is adjusted to the target flow rate to stabilize the opening pressure of the second proportional relief valve and the third proportional relief valve; finally, the first reversing valve is controlled to reverse, and the opening pressure of the first proportional relief valve is adjusted until the reading of the second pressure sensor reaches the preset pressure value.

[0070] Step S102: Calculate the valve core hydraulic pressure information under the current detection state based on the valve core position signal and the pressure signals collected by multiple pressure sensors.

[0071] In one embodiment of this application, the valve core hydraulic pressure information under the current detection state is calculated based on the valve core position signal and the pressure signals collected by multiple pressure sensors. This includes: inputting the valve core position signal under the current detection state, as well as the pressure signals collected by the first pressure sensor and the second pressure sensor, into a preset valve port structure network model; and calculating the valve core hydraulic pressure value and valve core hydraulic pressure direction under the current detection state through the valve port structure network model.

[0072] Specifically, in this embodiment, the valve core position signal collected by the displacement sensor and the pressure signals fed back by the first and second pressure sensors are acquired. The acquired sensor data is input into a pre-trained mathematical model of the valve port structure. This mathematical model is a pre-trained neural network model based on the structure and various attribute parameters of the valve under test. The specific type and training method of the mathematical model can be determined by considering factors such as the type of hydraulic valve and the required accuracy of steady-state hydrodynamic detection, and are not limited here. Then, the mathematical model of the valve port structure performs calculations based on the input data and outputs the valve core hydraulic pressure information under the current detection state.

[0073] Step S103: Based on the valve core fluid pressure information, the valve core fluid pressure is compensated by adjusting the opening pressure of multiple proportional relief valves to control the pressure compensation cylinder, and the readings of the tension and pressure sensors are recorded.

[0074] Specifically, the controller adjusts the opening pressure of the second or third proportional relief valve according to the pre-calibrated calculation method, uses the pressure compensation cylinder to compensate the valve core fluid pressure, and records the readings of the tension and pressure sensors.

[0075] Step S104: Adjust the valve core detection position of the valve under test through the drive unit, and repeat steps S102 to S103 to determine the relationship between the valve core hydraulic force and the valve core position under the current loading pressure level based on the reading of the tension and compression sensor.

[0076] Specifically, by changing the valve core detection position, steps S102 to S103 are repeated to determine the relationship between the valve core hydraulic force and the valve core position under the current loading pressure level. Based on the determined mapping relationship, the host computer plots a graph of the valve core hydraulic force and the valve core position under the initial pressure level.

[0077] Step S105: Adjust the loading pressure level of the valve under test by adjusting the adjustment unit, and repeat steps S102 to S104 to determine the relationship between the magnitude of the valve core hydraulic force and the valve core position under different loading pressure levels.

[0078] Specifically, by changing the loading level and repeating steps S102 to S104 above, the relationship between the magnitude of the valve core hydraulic power and the valve core position under different loading pressure levels is determined, and then the host computer plots the graph of the magnitude of the valve core hydraulic power and the valve core position under different pressure levels.

[0079] Based on the above embodiments, in order to more clearly describe the valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation of this application, the specific implementation process of each step and the overall implementation flow, the following describes in detail a specific detection method proposed in one embodiment of this application.

[0080] Figure 5 Here is a flowchart illustrating a specific method for detecting steady-state hydrodynamic forces in a valve core based on hydraulic pressure compensation, as proposed in this application. Figure 5 As shown, the method includes the following steps:

[0081] Step S201: Set M valve port loading pressure levels, and stabilize the loading pressure at the pressure level of m=1.

[0082] In this step, M and m are both positive integers. M represents the total number of loading pressure levels performed during the hydrodynamic testing process. M is predetermined based on the requirements of the test results. m represents a certain loading pressure level executed in the current testing state.

[0083] Step S202: Determine whether m is less than or equal to M. If yes, proceed to step S203; otherwise, proceed to step S209.

[0084] Step S203: Set N valve core position detection points, and set the valve core to a stable monitoring point position of n=1.

[0085] In this step, N and n are both positive integers. N represents the total number of detection points that need to be detected at their positions during the dynamic hydrodynamic detection process. M is predetermined according to the requirements of the detection results. m represents the detection at a certain detection point in the current detection state.

[0086] Step S204: Determine whether n is less than or equal to N. If yes, proceed to step S205; otherwise, proceed to step S208.

[0087] In step S205, the valve core position signal is obtained, the controller calculates the hydraulic pressure, and the pressure compensation cylinder performs hydraulic pressure compensation.

[0088] Step S206: Record the readings of the tension and compression sensors.

[0089] Step S207: Let n = n + 1, and return to execute step S204.

[0090] Step S208: Let m = m + 1, and return to execute step S202.

[0091] Step S209: Generate valve core hydraulic-position curves for different pressure levels.

[0092] As can be seen from the above steps, the valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation in this embodiment includes the following stages: First stage: Controller 14 controls the speed of the first variable frequency motor 21, making the output flow rate of the first metering pump 11 greater than the nominal flow rate of the valve under test. The speed of the second variable frequency motor 22 is controlled, making the output flow rate of the second metering pump 12 stable enough to stabilize the opening pressure of the second proportional relief valve 42 and the third proportional relief valve 43. The first reversing valve 71 is controlled to reverse. The opening pressure of the first proportional relief valve 41 is controlled, and adjustment stops after the reading of the second pressure sensor 52 reaches the specified pressure. The drive unit 9 is controlled to position the valve core in the initial detection position.

[0093] Second stage: Controller 14 controls the second directional valve 72 to switch directions. Based on the pressure sensor 5, displacement sensor 8, and the mathematical model of the valve port structure, the magnitude of the hydraulic pressure is calculated and the direction of the hydraulic pressure is determined.

[0094] Third stage: According to the calibrated calculation method, the controller 14 adjusts the opening pressure of the second proportional relief valve 42 or the third proportional relief valve 43 until the pressure compensation cylinder just offsets the valve core fluid pressure.

[0095] Fourth stage: Record the readings of the tension and compression sensors 10.

[0096] Fifth stage: Controller 14 controls drive unit 9 to change valve core detection position, repeating the second to fourth stages. Host computer 15 plots the graph of valve core hydraulic force magnitude and valve core position under the initial pressure level.

[0097] Sixth stage: Controller 14 controls the first proportional relief valve 41 to change the loading level, repeating the second to fifth stages. The host computer 15 plots the magnitude of the valve core hydraulic force and the valve core position under different pressure levels.

[0098] Based on the above description, compared to the first detection scheme in the aforementioned related embodiments, this application can pre-calibrate and compensate for the resultant force (including friction) of the valve core's steady-state hydrodynamic force and hydraulic force when the valve core is in no-load dry friction follow-up; while the detection scheme in the first related embodiment uses a simple formula calculation, ignoring the influence of friction. Furthermore, the testing process of this application is more intelligent; based on pre-set processes and judgment conditions, it can automatically output graphs of the valve core's hydrodynamic force and valve core position under different pressure levels; while the detection scheme in the first related embodiment has a low degree of automation. Moreover, the controller of this application can calculate the valve core's hydraulic pressure based on the valve port mathematical model, valve core displacement, and valve port pressure reading, and use a pressure compensation cylinder for compensation; while the detection scheme in the first related embodiment lacks a compensation device, and if the valve core's hydraulic force level is too high, a higher range tension / compression sensor is required.

[0099] Compared to the second detection scheme in the aforementioned related embodiments, this application can pre-calibrate and compensate for the resultant force (including friction force) of the valve core's steady-state hydrodynamic force and hydraulic force when the valve core is in no-load dry friction follow-up. The detection scheme in the second related embodiment uses a simple formula to calculate compensation, resulting in low accuracy and failing to consider the influence of other system components on the test. Furthermore, this application can test more types of valve cores; while the detection scheme in the second related embodiment only tests double-acting spool valves, resulting in low versatility.

[0100] In summary, the valve core steady-state hydrodynamic testing method based on hydraulic pressure compensation implemented in this application uses a pressure compensation cylinder to compensate for the hydraulic pressure of the valve under test. Data collected by the tension / compression sensors does not require secondary processing, resulting in more accurate test results. This method uses a follow-up testing approach, with the drive unit rigidly connecting the valve core and the pressure compensation cylinder. It allows for continuous and interval testing. During interval steady-state testing, the valve core exhibits no movement tendency, offsetting the influence of friction on the test. During continuous testing, the resultant force of the valve core's steady-state hydrodynamic force and hydraulic pressure can be pre-calibrated, and a corresponding proportional relief valve can be used to input a DC polarized current for resultant force compensation, further improving the accuracy of the test. Furthermore, this method can test various types of valve cores. Overcompensation or undercompensation can be performed through the pressure compensation cylinder, preventing excessive hydraulic force levels from exceeding the range of the tension / compression sensors. This reduces the limitations of steady-state hydrodynamic testing on the tension / compression sensors, improves the applicability and reliability of steady-state hydrodynamic testing, has a high degree of automation, and is easy to implement.

[0101] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program, which, when executed by a processor, implements the valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation as proposed in the second aspect of the present application.

[0102] It should be noted that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0103] Furthermore, in the description of this application, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limiting the present invention.

[0104] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0105] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0106] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0107] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this invention.

Claims

1. A valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation, characterized in that, include: The system includes an adjustment unit, multiple proportional relief valves, multiple pressure sensors, a drive unit, tension / compression sensors, a pressure compensation cylinder, and a controller. The first output terminal of the regulating unit is connected to the valve under test through the plurality of pressure sensors. The plurality of proportional relief valves are respectively connected in parallel on the connection line between the second output terminal of the regulating unit and the pressure compensation cylinder. The valve core of the valve under test, the pressure compensation cylinder, the tension and pressure sensors and the drive unit are connected in sequence. The controller establishes a communication connection with each device. The adjustment unit is used to adjust the loading pressure level of the valve under test, the drive unit is used to adjust the valve core detection position of the valve under test, and the multiple pressure sensors are used to collect the pressure signal of the valve under test under different detection states. The controller is used to adjust the opening pressure of the plurality of proportional relief valves according to the received data, so as to control the pressure compensation cylinder to compensate the valve core hydraulic pressure, and to determine the relationship between the valve core hydraulic power and the valve core position under different loading pressure levels based on the data collected by the tension and pressure sensors after hydraulic compensation.

2. The valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation according to claim 1, characterized in that, The regulating unit includes: multiple metering pumps, multiple variable frequency motors, multiple return liquid shut-off valves, and a first proportional relief valve, wherein, Each of the variable frequency motors is connected to a corresponding fixed displacement pump via a coupling, and the oil outlet of each fixed displacement pump is connected to the first end of a corresponding return liquid shut-off valve. The outlet of the first metering pump is connected to the first end of the first return liquid shut-off valve and then connected in parallel with the first proportional relief valve.

3. The valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation according to claim 2, characterized in that, The regulating unit further includes: a first reversing valve and a second reversing valve, wherein, The second end of the first return circuit breaker valve is connected to the first reversing valve, and the working oil port of the first reversing valve is connected to the inlet and return port of the valve under test, respectively. The second end of the second return fluid shut-off valve is connected to the second reversing valve, and the working oil port of the second reversing valve is connected to the left and right working chambers of the pressure compensation cylinder, respectively.

4. The valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation according to claim 3, characterized in that, Also includes: Flow meter, among which, The first pressure sensor, the second pressure sensor, and the flow meter are respectively connected to the working port of the first reversing valve and the connection line between the valve to be tested; The second proportional relief valve is connected in parallel to the connection line between the working port of the second directional valve and the left working chamber, and the third proportional relief valve is connected in parallel to the connection line between the working port of the second directional valve and the right working chamber. The output of the second proportional relief valve is also connected to a third pressure sensor, and the output of the third proportional relief valve is also connected to a fourth pressure sensor.

5. The valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation according to claim 1, characterized in that, Also includes: Displacement sensor, among which, The valve core of the valve under test is connected to the left piston rod of the pressure compensation cylinder via a first connecting bolt. The right piston rod of the pressure compensation cylinder is connected to the first end of the tension-compression sensor via a second connecting bolt. The second end of the tension-compression sensor is connected to the first end of the drive unit via a third connecting bolt. The second end of the drive unit is connected to the displacement sensor. The displacement sensor is used to detect the position of the valve core of the valve under test.

6. The valve core steady-state hydrodynamic detection device based on hydraulic pressure compensation according to claim 1, characterized in that, Also includes: The host computer is connected to the controller. The host computer is used to draw a graph of the magnitude of the hydraulic force of the valve core and the position of the valve core under different loading pressure levels based on the data transmitted by the controller.

7. A method for detecting steady-state hydrodynamic forces of a valve core based on hydraulic pressure compensation, characterized in that, The method for detecting the steady-state hydrodynamic force of a valve core based on hydraulic pressure compensation, as described in any one of claims 1 to 6, comprises the following steps: Step S101: Adjust the loading pressure level of the valve under test to the initial pressure level through the adjustment unit, and adjust the valve core of the valve under test to the initial detection position through the drive unit; Step S102: Calculate the valve core hydraulic pressure information under the current detection state based on the valve core position signal and the pressure signals collected by multiple pressure sensors; Step S103: Based on the valve core fluid pressure information, the pressure compensation cylinder is controlled to compensate the valve core fluid pressure by adjusting the opening pressure of the plurality of proportional relief valves, and the readings of the tension and pressure sensors are recorded. Step S104: Adjust the valve core detection position of the valve under test through the drive unit, and repeat steps S102 to S103 to determine the relationship between the valve core hydraulic force and the valve core position under the current loading pressure level based on the reading of the tension and compression sensor. Step S105: Adjust the loading pressure level of the valve under test through the adjustment unit, and repeat steps S102 to S104 to determine the relationship between the valve core hydraulic force and the valve core position under different loading pressure levels.

8. The method for detecting steady-state hydrodynamic forces of a valve core based on hydraulic pressure compensation according to claim 7, characterized in that, The step of adjusting the loading pressure level of the valve under test to the initial pressure level via the adjustment unit includes: By controlling the speed of the first variable frequency motor, the output flow rate of the first fixed displacement pump is adjusted to be greater than the nominal flow rate of the valve under test; By controlling the speed of the second variable frequency motor, the output flow of the second fixed displacement pump is adjusted to the target flow to stabilize the opening pressure of the second and third proportional relief valves. Control the first reversing valve to switch direction and adjust the opening pressure of the first proportional relief valve until the reading of the second pressure sensor reaches the preset pressure value.

9. The method for detecting steady-state hydrodynamic forces of a valve core based on hydraulic pressure compensation according to claim 7, characterized in that, The calculation of valve core hydraulic pressure information under the current detection state based on the valve core position signal and pressure signals collected by multiple pressure sensors includes: The valve core position signal under the current detection state, as well as the pressure signals collected by the first pressure sensor and the second pressure sensor, are input into the preset valve port structure network model. The valve core fluid pressure value and valve core fluid pressure direction under the current detection state are calculated using the valve port structure network model.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the valve core steady-state hydrodynamic detection method based on hydraulic pressure compensation as described in any one of claims 7-9.

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