Method and apparatus for testing a servo valve

Abstract

The application discloses a kind of servo valve test method and device, test method includes: obtaining the target test item of servo valve and multiple test signals of pre-set, wherein the multiple test signals are different percentage of the target test item rated signal;According to the control signal of the target test item continuous regular variation, the servo valve is tested, and regular variation curve is obtained;According to each test signal in the multiple test signals, the servo valve is tested, and pre-set test information is obtained;According to the regular variation curve and the pre-set test information, the performance test result of the servo valve is obtained.The multiple test signals test is the test performance of servo valve in corresponding test condition, so pre-set test information is compared with regular variation curve, can accurately know the stability of servo valve in corresponding test condition, and then improve the accuracy of servo valve performance test result.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of servo valve performance testing, and in particular to a servo valve testing method and device. BACKGROUND

[0002] Due to the ability of the electro-hydraulic servo valve to accurately control the position, pressure, speed, etc. of the actuator, the electro-hydraulic servo valve is widely used in various industries such as metallurgy, aviation, aerospace, shipping, military industry, etc. The metallurgical industry uses a large number of electro-hydraulic servo valves in rolling thickness control, straightening control, coiling control, etc. due to its own working characteristics. The current testing method cannot accurately test the control performance of the servo valve. When the servo valve is applied to the harsh environment of high temperature, high pressure, dust, water vapor, etc. in the metallurgical industry, frequent occurrence of difficult and occasional faults in the servo hydraulic control system causes certain difficulties in equipment fault diagnosis.

[0003] Therefore, how to improve the accuracy of the servo valve performance test result is a technical problem to be solved at present. SUMMARY

[0004] The servo valve testing method and device provided by the present application improve the accuracy of the servo valve performance test result.

[0005] The embodiments of the present application provide the following solutions:

[0006] In a first aspect, the embodiments of the present application provide a servo valve testing method, comprising:

[0007] obtaining a target test item of a servo valve and a plurality of preset test signals, wherein the plurality of test signals are different percentages of a rated signal of the target test item;

[0008] testing the servo valve according to a control signal that varies continuously according to the target test item to obtain a regular variation curve;

[0009] testing the servo valve according to each test signal in the plurality of test signals to obtain preset test information;

[0010] obtaining a performance test result of the servo valve according to the regular variation curve and the preset test information.

[0011] In an optional embodiment, the obtaining of the plurality of preset test signals comprises:

[0012] obtaining a preset single adjustment opening degree and an adjustment opening degree threshold of the servo valve;

[0013] obtaining a rated parameter of the rated signal;

[0014] obtaining all the regulating opening degrees within the regulating opening degree threshold according to the regulating opening degree threshold and the single regulating opening degree;

[0015] obtaining the plurality of test signals according to the rated parameter and all the regulating opening degrees.

[0016] In an optional embodiment, the target test item is a flow test and / or a pressure test, and the servo valve is tested according to the control signal that changes continuously and regularly according to the target test item to obtain a regular change curve, including:

[0017] obtaining a rated positive value and a rated negative value of the rated signal;

[0018] obtaining a regular change curve by testing the servo valve according to the continuous change of the control signal between the rated positive value and the rated negative value; wherein the regular change curve corresponds to a nominal flow curve and / or a pressure gain curve.

[0019] In an optional embodiment, the servo valve is tested according to each test signal in the plurality of test signals to obtain preset test information, including:

[0020] obtaining a preset test time threshold and a test load;

[0021] obtaining a current test signal of the plurality of test signals;

[0022] controlling the servo valve to reach a current opening degree according to the current test signal;

[0023] loading the test load on the servo valve at the current opening degree within the test time threshold to obtain current test information;

[0024] obtaining preset test information according to all the current test information.

[0025] In an optional embodiment, the test time threshold is 1 minute.

[0026] In an optional embodiment, the preset test information is obtained according to all the current test information, including:

[0027] obtaining current data of the current test information;

[0028] generating a current test curve according to all the current data to obtain the preset test information.

[0029] In an optional embodiment, the performance test result of the servo valve is obtained according to the regular change curve and the preset test information, including:

[0030] obtaining a preset deviation threshold value;

[0031] comparing the preset test information and the corresponding target information in the regular variation curve to obtain a current comparison result;

[0032] obtaining the performance test result according to the current comparison result and the deviation threshold value.

[0033] In a second aspect, the embodiment of the present application further provides a test device of a servo valve, comprising:

[0034] an obtaining module, configured to obtain a target test item of a servo valve and a plurality of preset test signals, wherein the plurality of test signals are different percentages of a rated signal of the target test item;

[0035] a first obtaining module, configured to test the servo valve according to a control signal of the target test item continuously and regularly varied to obtain a regular variation curve;

[0036] a second obtaining module, configured to test the servo valve according to each test signal in the plurality of test signals to obtain preset test information;

[0037] a third obtaining module, configured to obtain a performance test result of the servo valve according to the regular variation curve and the preset test information.

[0038] In a third aspect, the embodiment of the present application further provides an electronic device, comprising a processor and a memory, the memory is coupled to the processor, and the memory stores instructions, when the instructions are executed by the processor, the electronic device performs the steps of the method in any one of the first aspect.

[0039] In a fourth aspect, the embodiment of the present application further provides a computer readable storage medium, which stores a computer program, when the program is executed by a processor, the steps of the method in any one of the first aspect are implemented.

[0040] The test method and device of the servo valve provided by the present application have the following advantages compared with the prior art:

[0041] The present application obtains a plurality of preset test signals through the rated signals of different percentages of the target test item, tests the servo valve through each test signal in the plurality of test signals to obtain preset test information, compares the preset test information with the regular variation curve tested by the control signal of the target test item continuously and regularly varied to obtain the performance test result of the servo valve, since the plurality of test signals test the test performance of the servo valve under the corresponding test conditions, therefore, the comparison between the preset test information and the regular variation curve can accurately know the stability of the servo valve under the corresponding test conditions, and further improves the accuracy of the performance test result of the servo valve. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present specification, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0043] Figure 1 A structural schematic diagram of a loading test bench of a servo valve is provided for the embodiments of the present application.

[0044] Figure 2 A flowchart of a test method of a servo valve is provided for the embodiments of the present application.

[0045] Figure 3 A structural schematic diagram of a test device of a servo valve is provided for the embodiments of the present application.

[0046] Legend: 1 - servo valve, 2 - servo B ball valve, 3 - servo B loading ball valve, 4 - servo loading ball valve, 5 - servo proportional loading valve, 6 - flow meter, 7 - servo A loading ball valve, 8 - servo A ball valve, 9 - pressure sensor, 10 - pressure gauge, 11 - servo T ball valve. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the embodiments of the present application.

[0048] The test method of the present application takes servo valve D664Z4306K as an example to specifically describe how to implement the test method. The loading of the servo valve 1 is completed through a loading test bench. The test bench meets the requirements of the no-load flow, pressure gain test hydraulic circuit of GBT 15623.1-2018 Hydraulic Transmission, Four-way Directional Flow Control Valve Test Method. The test bench automatically collects pressure signals, flow signals and control signals, and draws no-load flow curves and pressure gain curves. It can automatically calculate the static indicators such as nominal flow curve, hysteresis, zero offset, dead zone, linearity, resolution and symmetry of electro-hydraulic servo valve. The tester can manually input test signals of any value within the control signal range of the servo valve. The connection structure of the loading test bench and the servo valve 1 is shown in Figure 1, the P port of the loading test bench is connected with the oil cylinder type load, the hydraulic oil is controlled to switch direction through the X port or the Y port of the servo valve, for example, when the P port and the B port of the control servo valve are connected, the hydraulic oil flows through the servo B ball valve 2, the servo B loading ball valve 3, the servo loading ball valve 4, the servo proportional loading valve 5, the flowmeter 6, the servo A loading ball valve 7 and the servo A ball valve 8 in turn, and then reaches the servo T ball valve 11 through the A port and the T port; conversely, when the P port and the A port are connected, the hydraulic oil reaches the servo T ball valve 11 through the B port and the T port in the opposite direction. The flow in the oil circuit is collected and read through the flowmeter 6, and the pressure in the oil circuit is collected and read through the three pressure sensors 9 or the pressure gauge 10. The following embodiments of the application will specifically illustrate how to implement the test method of the servo valve.

[0049] Please refer to Figure 2 , Figure 2 A flow chart of a test method of a servo valve provided by the embodiments of the application, comprising:

[0050] S11, obtaining a target test item of the servo valve and a plurality of preset test signals, wherein the plurality of test signals are different percentages of a rated signal of the target test item.

[0051] Specifically, the target test item of the servo valve usually includes flow test and pressure test, and can also be other types of test items. According to the type of the servo valve, the test item can be selected, and one or two of them can be selected for testing. The rated signal is the rated voltage or rated current of the servo control of the target test item. The rated signal of the flow control and pressure control of the servo valve in the embodiments of the application is ±10 mA, and the adjustment range of the control signal of the flow control and pressure control is-10-10 mA. The plurality of test signals are signals determined at different percentages between-10 and 10 mA.

[0052] In a specific embodiment, the plurality of preset test signals are obtained, comprising:

[0053] Obtaining the adjustment opening threshold of the servo valve and the preset single adjustment opening, obtaining the rated parameter of the rated signal, obtaining all adjustment openings within the adjustment opening threshold according to the adjustment opening threshold and the single adjustment opening, and obtaining the plurality of test signals according to the rated parameter and all adjustment openings.

[0054] Specifically, the servo valve is usually not fully opened in actual application, and reciprocating adjustment is performed within the adjustment opening threshold, for example, when the hydraulic station is started to drive the oil cylinder to reach the target pressure, the servo valve will perform real-time adjustment within 5% of the opening degree, and the adjustment opening threshold is 5% of the total opening degree. The rated parameter of the rated signal corresponds to the control parameter of the maximum opening degree of the servo valve, and the single adjustment opening degree is the opening degree range controlled by the servo valve for one adjustment, for example, 1% of the total opening degree can be used as the single adjustment opening degree, and the servo valve is controlled to execute the single adjustment opening degree once, and the opening degree of the servo valve is increased or decreased by 1% of the total opening degree, all the adjustment opening degrees within the adjustment opening threshold are 1%, 2%, 3%, 4% and 5%, and the plurality of test signals are the products of the rated parameter and all the adjustment opening degrees. After obtaining the target test item and the plurality of test signals, step S12 is entered.

[0055] S12, test the servo valve according to the continuously and regularly changed control signal of the target test item, and obtain a regularly changed curve.

[0056] Specifically, the regularly changed curve can record the continuously and regularly changed control signal on the X-axis, and record the information corresponding to the output of the target test item, such as flow or pressure, to reflect the change of the corresponding flow or pressure when the control signal changes. The regularly changed curve reflects the corresponding relationship between the control signal and the target test item.

[0057] In a specific embodiment, the target test item is a flow test and / or a pressure test, the servo valve is tested according to the continuously and regularly changed control signal of the target test item, and a regularly changed curve is obtained, including:

[0058] The rated positive value and the rated negative value of the rated signal are obtained, and the servo valve is tested according to the continuous change of the control signal between the rated positive value and the rated negative value, and a regularly changed curve is obtained. The regularly changed curve corresponds to a nominal flow curve and / or a pressure gain curve.

[0059] Specifically, when the target test item is a flow test, the test conditions meet the requirements of Table 1.

[0060] Table 1:

[0061]

[0062]

[0063] The control signal is tested between the rated positive value (10 mA) and the rated negative value (-10 mA). The control signal is slowly increased from zero to the rated positive value, then from the rated positive value to the rated negative value, and then to zero. The servo valve flow and the control signal are continuously collected. The input control signal is recorded on the X axis, and the output flow is recorded on the Y axis. The no-load flow curve is plotted. The nominal flow curve, hysteresis, zero offset, dead zone, linearity, resolution, and symmetry of the servo valve are calculated.

[0064] When the target test item is pressure testing, the test conditions meet the requirements of Table 2.

[0065] Table 2:

[0066]

[0067] The control signal input to the servo valve is slowly increased from zero to the rated positive value (10 mA), and then from the rated positive value (10 mA) to the rated negative value (-10 mA), and then to zero. The servo valve A and B port output pressures and the control signal are continuously collected. The input control signal is recorded on the X axis, and the output pressure is recorded on the Y axis. The pressure gain curve and the pressure gain average curve are plotted. The servo valve A and B port output pressure difference is calculated. After obtaining the regular variation curve, step S13 is entered.

[0068] S13, testing the servo valve according to each test signal in the plurality of test signals to obtain preset test information.

[0069] Specifically, the test signal is the control signal of the servo valve at a fixed opening position. The preset test information obtained by testing the servo valve through each test signal can know the test state of the servo valve at the opening corresponding to the target test item.

[0070] In a specific embodiment, testing the servo valve according to each test signal in the plurality of test signals to obtain preset test information includes:

[0071] A preset test time threshold and a test load are obtained. A current test signal of the plurality of test signals is obtained. The servo valve is controlled to reach a current opening according to the current test signal. The test load is loaded on the servo valve at the current opening within the test time threshold to obtain current test information. The preset test information is obtained according to all the current test information.

[0072] Specifically, the test time threshold can be freely set according to actual conditions. In order to ensure the accuracy of the test results and improve the test efficiency of the test signal of the servo valve, the test time threshold can be set to 1 minute. According to the current test signal, the servo valve is controlled to reach the current opening degree, the test load is loaded on the servo valve through the loading test table, and the current test information is recorded within the test time threshold. After each test signal is tested, the preset test information can be obtained.

[0073] In actual application, in order to ensure the comprehensiveness of the test results, the adjustment opening threshold can be generally set to be greater than the actual adjustment opening, for example, the actual adjustment opening of the servo valve is 10% of the total opening, and the adjustment opening threshold can be selected as 20% of the total opening. The flow direction of the hydraulic oil in the servo valve includes forward flow and reverse flow. Therefore, the plurality of test signals are set to 1%, 2%, 3%, …, 20% of the rated positive value, 1%, 2%, 3%, …, 20% of the rated negative value, each test signal is tested within the test time threshold, and the preset test information is recorded. After obtaining the preset test information, step S14 is entered.

[0074] S14, obtaining the performance test result of the servo valve according to the regular change curve and the preset test information.

[0075] Specifically, the regular change curve represents the control result of the continuous regular change control signal on the servo valve, and there is a fitting relationship between the corresponding signal value and the servo valve output result in all control signals in the rated signal. The preset test information represents the control result of a certain fixed control signal on the servo valve, which can be compared through the regular change curve. If the preset test information has a large fluctuation relative to the regular change curve, it means that the control of the test signal corresponding to the preset test information on the servo valve has a deviation, that is, the stability of the flow or pressure control of the servo valve under the control of the test signal is insufficient. On the contrary, if the preset test information does not have a large fluctuation relative to the regular change curve, it means that the servo valve is relatively stable under the control of the test signal.

[0076] In a specific embodiment, the performance test result of the servo valve is obtained according to the regular change curve and the preset test information, including:

[0077] obtaining a preset deviation threshold; comparing the preset test information and the corresponding target information in the regular change curve to obtain a current comparison result; and obtaining the performance test result according to the current comparison result and the deviation threshold.

[0078] Specifically, the deviation threshold value can be determined according to the requirement of the servo valve control stability, and the higher the stability requirement is, the smaller the deviation threshold value can be set. If the current comparison result does not exceed the deviation threshold value, it indicates that the performance test result of the servo valve meets the performance use requirement; if the current comparison result exceeds the deviation threshold value, it indicates that the performance test result of the servo valve cannot meet the performance use requirement.

[0079] In actual application, if the test results obtained by each test signal are compared with the regular change curve one by one, more time is needed.

[0080] To solve the above problems, in a specific embodiment, the preset test information is obtained according to all the current test information, including:

[0081] The current data of the current test information is obtained; the current test curve is generated by fitting all the current data, and the preset test information is obtained.

[0082] Specifically, the current data can be the average value of the test data recorded at the test time threshold value, the current test curve is generated by fitting all the current data, that is, the preset test information represents the test results of all the test signals through the current test curve, which is convenient for overall comparison with the regular change curve, and the stable operation of the servo valve is judged according to the coincidence of the two curves.

[0083] Based on the same inventive concept as the test method, the embodiment of the present application also provides a test device of a servo valve, please refer to Figure 3 , comprising:

[0084] The acquisition module 301 is used to acquire the target test item of the servo valve and the preset plurality of test signals, wherein the plurality of test signals are different percentages of the target test item rated signal;

[0085] The first obtaining module 302 is used to test the servo valve according to the control signal of the continuous regular change of the target test item, and obtain a regular change curve;

[0086] The second obtaining module 303 is used to test the servo valve according to each test signal in the plurality of test signals, and obtain preset test information;

[0087] The third obtaining module 304 is used to obtain the performance test result of the servo valve according to the regular change curve and the preset test information.

[0088] Based on the same inventive concept as the test method, the embodiment of the present application also provides an electronic device, including a processor and a memory, the memory is coupled to the processor, the memory stores instructions, when the instructions are executed by the processor, the electronic device executes the steps of any one of the test methods.

[0089] Based on the same inventive concept as the test method, the embodiments of the present application also provide a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the steps of the method in any one of the test methods.

[0090] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0091] The preset multiple test signals are obtained by the rated signals of different percentages of the target test item, each test signal in the multiple test signals is used to test the servo valve, the preset test information is obtained, the preset test information is compared with the regular change curve of the target test item continuous regular change control signal, and the performance test result of the servo valve is obtained. Since the multiple test signals test the test performance of the servo valve under the corresponding test conditions, the comparison between the preset test information and the regular change curve can accurately know the stability of the servo valve under the corresponding test conditions, and the accuracy of the performance test result of the servo valve is improved.

[0092] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0093] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (modules, systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The device that implements the functions specified in one or more flows and / or blocks. Figure 1 The device that implements the functions specified in one or more flows and / or blocks.

[0094] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing devices to work in a specific way, so that the instructions stored in the computer readable storage medium produce a product including instruction devices, which implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The device that implements the functions specified in one or more flows and / or blocks.Figure 1 the function specified in the one or more blocks.

[0095] These computer program instructions can also be loaded into computer or other programmable data processing devices, so that a series of operations steps are performed on the computer or other programmable data processing devices to generate computer-implemented processes, thus the instructions executed on the computer or other programmable data processing devices provide processes for implementing the flow Figure 1 the flow or flows and / or blocks Figure 1 the steps of the function specified in the one or more blocks.

[0096] Although preferred embodiments of the application have been described, those skilled in the art will recognize that additional modifications and variations can be made thereto without departing from the spirit and scope of the application. It is therefore intended that the appended claims cover all such modifications and variations as fall within the scope of the application.

[0097] It is apparent that a person skilled in the art can make a variety of modifications and variations to the application without departing from the spirit and scope of the application. Thus, if these modifications and variations of the application fall within the scope of the claims and their equivalents, the application is also intended to include these modifications and variations.

Claims

1. A method of testing a servo valve, characterized by, The method comprises the following steps: obtaining a target test item of a servo valve and a plurality of preset test signals, wherein the plurality of test signals are different percentages of a rated signal of the target test item; testing the servo valve according to a control signal of the target test item that changes continuously and regularly to obtain a regular change curve; testing the servo valve according to each of the plurality of test signals to obtain preset test information; obtaining a performance test result of the servo valve according to the regular change curve and the preset test information; the plurality of test signals are control signals of the servo valve at a plurality of fixed opening degree points; the plurality of test signals are control signals of the servo valve at a plurality of fixed opening degree points; the method comprises the following steps: obtaining a regulation opening degree threshold value of the servo valve and a preset single regulation opening degree; obtaining a rated parameter of the rated signal; obtaining all regulation opening degrees within the regulation opening degree threshold value according to the regulation opening degree threshold value and the single regulation opening degree; obtaining the plurality of test signals according to the rated parameter and the all regulation opening degrees; the method comprises the following steps: obtaining a preset test time threshold value and a test load; obtaining a current test signal of the plurality of test signals; controlling the servo valve to reach a current opening degree according to the current test signal; loading the test load on the servo valve at the current opening degree within the test time threshold value to obtain current test information; 2. The method of testing a servo valve of claim 1, wherein, obtaining preset test information according to all the current test information. The target test item is a flow test and / or a pressure test, and the method comprises the following steps: obtaining a rated positive value and a rated negative value of the rated signal; 3. The method of testing a servo valve of claim 1, wherein, testing the servo valve according to continuous changes of the control signal between the rated positive value and the rated negative value to obtain a regular change curve; wherein the regular change curve corresponds to a nominal flow curve and / or a pressure gain curve.

4. The method of testing a servo valve of claim 1, wherein, The test time threshold value is 1 minute. The method comprises the following steps: obtaining current data of the current test information; 5. The method of testing a servo valve of claim 1, wherein, generating a current test curve according to all the current data to obtain the preset test information. The method comprises the following steps: obtaining a preset deviation threshold value; comparing the preset test information and corresponding target information in the regular change curve to obtain a current comparison result; 6. A test device for a servo valve, characterized in that obtaining the performance test result according to the current comparison result and the deviation threshold value. The method comprises the following steps: an obtaining module is configured to obtain a target test item of a servo valve and a plurality of preset test signals, wherein the plurality of test signals are different percentages of a rated signal of the target test item; a first obtaining module is configured to test the servo valve according to a control signal of the target test item that changes continuously and regularly to obtain a regular change curve; a second obtaining module is configured to test the servo valve according to each of the plurality of test signals to obtain preset test information; a third obtaining module, configured to obtain a performance test result of the servo valve according to the regular variation curve and the preset test information; the multiple test signals are control signals of the servo valve at multiple fixed opening degree points; the obtaining of the preset multiple test signals comprises: obtaining an adjustment opening degree threshold of the servo valve and a preset single adjustment opening degree; obtaining a rated parameter of the rated signal; obtaining all adjustment opening degrees within the adjustment opening degree threshold according to the adjustment opening degree threshold and the single adjustment opening degree; obtaining the multiple test signals according to the rated parameter and the all adjustment opening degrees; the obtaining of preset test information by testing the servo valve according to each test signal of the multiple test signals comprises: obtaining a preset test time threshold and a test load; obtaining a current test signal of the multiple test signals; controlling the servo valve to reach a current opening degree according to the current test signal; loading the test load to the servo valve at the current opening degree within the test time threshold to obtain current test information; obtaining preset test information according to all the current test information.

7. An electronic device, comprising: An electronic device comprising a processor and a memory coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of any one of the methods of claims 1-5.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, A program that, when executed by a processor, implements the steps of any one of the methods of claims 1-5.

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