Hydraulic valve fatigue test method and hydraulic valve fatigue test device

Abstract

This invention relates to the field of hydraulic valve fatigue testing technology, and particularly to a hydraulic valve fatigue testing method and apparatus. The hydraulic valve fatigue testing method includes: connecting the valve under test between an inlet pipe and a return pipe; and supplying a predetermined flow rate of liquid to the valve under test at a predetermined frequency. The hydraulic valve testing method provided by this invention uses a flow pulse approach to test the valve under test, which can better simulate the actual working environment of the valve, making the valve's state in the experiment more closely resemble its state in actual operation, thereby achieving high accuracy in the valve fatigue test.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve fatigue testing technology, and in particular to a hydraulic valve fatigue testing method and a hydraulic valve fatigue testing device. Background Technology

[0002] Hydraulic valves are devices used to control the flow direction of oil in a hydraulic system, regulate the pressure of the oil, or regulate the flow rate of the oil. The valve body reciprocates continuously under the action of springs and oil pressure, so the fatigue life of hydraulic valves is quite important. Hydraulic valve fatigue testing is used to test the fatigue life of hydraulic valves.

[0003] Currently, the commonly used fatigue test for hydraulic valves is the pressure pulse test. The problem is that the state of the hydraulic valve during the pressure pulse test is different from the state of the hydraulic valve in actual application. Therefore, the pressure pulse test cannot simulate the actual operating state of the hydraulic valve well, resulting in poor accuracy of the test results. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic valve fatigue testing method and hydraulic valve fatigue, so as to solve the technical problem that the pressure pulse test in the prior art cannot well simulate the actual operating state of the hydraulic valve, resulting in poor accuracy of the test results.

[0005] This invention provides a fatigue testing method for hydraulic valves, comprising:

[0006] Connect the valve under test between the inlet line and the return line;

[0007] A preset flow rate of liquid is supplied to the valve under test at a preset frequency.

[0008] Furthermore, the step of supplying liquid at a preset flow rate to the valve under test at a preset frequency specifically includes:

[0009] The preset flow rate of liquid is continuously supplied to the inlet pipeline;

[0010] The liquid in the inlet pipe is diverted at the preset frequency.

[0011] The present invention also provides a hydraulic valve fatigue testing device, comprising: a reservoir, an inlet pipe, a return pipe, and a flow regulating component; one end of the inlet pipe is connected to the outlet of the reservoir, and the other end of the inlet pipe is connected to the inlet of the valve under test; one end of the return pipe is connected to the inlet of the reservoir, and the other end of the return pipe is connected to the outlet of the valve under test; the flow regulating component reduces the preset flow rate of the liquid in the inlet pipe at a preset frequency to form a flow pulse.

[0012] Furthermore, the hydraulic valve fatigue testing device includes a controller, a flow measuring element, and a pressure measuring element; both the flow measuring element and the pressure measuring element are located at the end of the inlet pipe; the flow regulating element, the flow measuring element, and the pressure measuring element are all communicatively connected to the controller.

[0013] Furthermore, the inlet of the flow regulating device is connected to the liquid inlet pipe, and the outlet of the flow regulating device is connected to the liquid storage tank.

[0014] Furthermore, the flow regulating component is a solenoid valve that is communicatively connected to the controller, or the flow regulating component is an electric rotary valve that is communicatively connected to the controller.

[0015] Furthermore, the flow regulating component includes a solenoid valve and the electric rotary valve, which are arranged in parallel.

[0016] Furthermore, the hydraulic valve fatigue testing device also includes a heater and a first temperature measuring element. The heater is disposed on the liquid storage tank, and the first temperature measuring element is disposed on the liquid storage tank to measure the liquid temperature in the liquid storage tank. Both the heater and the first temperature measuring element are communicatively connected to the controller.

[0017] Furthermore, the hydraulic valve fatigue testing device also includes a second temperature measuring element that is communicatively connected to the controller. The second temperature measuring element is disposed at the end of the inlet pipe to measure the liquid temperature inside the inlet pipe.

[0018] Furthermore, the hydraulic valve fatigue testing device also includes a cooling pipe, a cooling circulation pump, and a radiator. One end of the cooling pipe is connected to the cooling outlet of the liquid storage tank, and the other end is connected to the cooling inlet of the liquid storage tank. The cooling circulation pump and the radiator are connected in series on the cooling pipe.

[0019] This invention provides a fatigue testing method for a hydraulic valve, comprising: connecting the valve under test between an inlet pipe and a return pipe; and supplying a predetermined flow rate of liquid to the valve under test at a predetermined frequency. The inlet pipe and the return pipe form a liquid circuit for testing the valve under test. The valve under test is connected in series between the inlet pipe and the return pipe. Then, the predetermined flow rate of liquid is supplied to the valve under test at a predetermined frequency, opening the valve under test. The predetermined flow rate of fluid at the predetermined frequency forms flow pulses, causing the valve under test to repeatedly open and close, thereby achieving fatigue testing of the valve under test. The hydraulic valve testing method provided by this invention uses flow pulses to test the valve under test, which can better simulate the actual working environment of the valve, making the valve's state in the experiment more closely resemble its state in actual operation, thus enabling high accuracy in fatigue testing of the valve. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a hydraulic valve fatigue testing device according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a hydraulic valve fatigue testing device according to another embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a hydraulic valve fatigue testing device according to another embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a hydraulic valve fatigue testing device according to another embodiment of the present invention.

[0025] In the diagram: 1 - Storage tank; 2 - Inlet pipe; 3 - Return pipe; 4 - Flow control device; 5 - Valve under test; 6 - Inlet pump; 7 - Inlet filter; 8 - Flow measurement device; 9 - Pressure measurement device; 10 - First inlet valve; 11 - Second inlet valve; 13 - Third inlet valve; 14 - Flow control valve; 15 - Outlet valve; 16 - Liquid level sensor; 17 - Heater; 18 - First temperature measurement device; 19 - Second temperature measurement device; 20 - Cooling pipe; 21 - Cooling circulation pump; 22 - Radiator; 23 - Cooling filter; 24 - Cooling valve; 41 - Solenoid valve; 42 - Electric rotary valve. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Example 1:

[0028] This invention provides a fatigue testing method for hydraulic valves, comprising:

[0029] Connect the valve under test between the inlet line and the return line;

[0030] A preset flow rate of liquid is supplied to the valve under test at a preset frequency.

[0031] In this embodiment, the inlet and return lines form a liquid circuit for testing the valve under test. The valve under test is connected in series between the inlet and return lines. A preset flow rate of liquid is then supplied to the valve under test at a preset frequency. This preset flow rate of liquid opens the valve, and the preset frequency and flow rate of fluid form flow pulses, causing the valve under test to repeatedly open and close, thereby achieving fatigue testing. The hydraulic valve testing method provided in this embodiment uses flow pulses to test the valve under test, which can better simulate the actual working environment of the valve, making the valve's state in the experiment more closely resemble its actual working state, thus enabling high accuracy in fatigue testing.

[0032] One method for fatigue testing the valve under test is to continuously supply liquid at a preset frequency and flow rate until the valve fails, thereby determining the valve's lifespan. Alternatively, a set number of tests can be set, and if the valve remains intact after the set number of tests is completed, it indicates that the valve meets the usage requirements, and the test can be stopped.

[0033] It should be noted that the preset frequency and preset flow rate can be changed and can be set as needed.

[0034] There are several ways to achieve the goal of supplying a preset flow rate of liquid to the valve under test at a preset frequency. For example, a valve can be installed on the inlet pipe, connected in series with the valve under test. The opening and closing of the inlet pipe is controlled by the opening and closing of the valve, thereby achieving intermittent supply of a preset flow rate of liquid to the valve under test, which is to achieve flow pulse. The valve is switched between open and closed states at a preset frequency, thereby achieving the goal of supplying a preset flow rate of liquid to the valve under test at a preset frequency. Alternatively, the flow rate of liquid supplied to the valve under test can be adjusted by changing the valve opening. When the valve is fully open, the flow rate of liquid supplied to the valve under test is the preset flow rate. When the valve opening decreases, the flow rate of liquid supplied to the valve under test is less than the preset flow rate.

[0035] As an optional solution, the step of supplying liquid at a preset flow rate to the valve under test at a preset frequency specifically includes:

[0036] The preset flow rate of liquid is continuously supplied to the inlet pipeline;

[0037] The liquid in the inlet pipe is diverted at the preset frequency.

[0038] In this embodiment, the liquid is diverted at a preset frequency. This means that diverting and not diverting the liquid in the inlet line alternates. When the liquid in the inlet line is not diverted, it is delivered to the valve under test at a preset flow rate. When the liquid in the inlet line is diverted, it is intermittently delivered to the valve under test at a preset flow rate. This method avoids directly cutting off the preset flow rate of liquid; only the diversion needs to be controlled. The diverted flow rate is less than the preset flow rate, and the pressure of the diverted liquid is also less than the pressure of the liquid at the preset flow rate, making the control process easier to implement and control.

[0039] Example 2:

[0040] This embodiment provides an apparatus capable of implementing the above-described hydraulic valve fatigue testing method.

[0041] like Figure 1 As shown, the present invention provides a hydraulic valve fatigue testing device, comprising a storage tank, an inlet pipe 2, a return pipe 3, and a flow regulating component 4; one end of the inlet pipe 2 is connected to the outlet of the storage tank 1, and the other end of the inlet pipe is used to connect to the inlet of the valve under test 5; one end of the return pipe 3 is connected to the inlet of the storage tank, and the other end of the return pipe 3 is used to connect to the outlet of the valve under test 5; the flow regulating component 4 is connected to the inlet pipe 2, and the flow regulating component 4 reduces the preset flow rate of the liquid in the inlet pipe 2 at a preset frequency to form a flow pulse.

[0042] The liquid storage tank 1 is used to store the liquid used to test the valve 5. The liquid in the liquid storage tank 1 flows into the liquid inlet pipe 2. When the conditions for opening the valve 5 are met, the valve 5 will be opened. Then the liquid flows into the return pipe 3 and finally flows back into the liquid storage tank 1, avoiding the need to set up a separate storage device to collect the returned liquid.

[0043] In this embodiment, when it is necessary to test the lifespan of the valve under test 5 at a preset flow rate, the liquid storage tank 1 supplies a preset flow rate of liquid to the inlet pipe 2. This preset flow rate of liquid flows through the inlet pipe 2 to the valve under test 5, opening the valve. The preset flow rate of the liquid supplied to the valve under test 5 through the inlet pipe 2 is adjusted by the flow regulating valve, so that the flow rate of the liquid in the inlet pipe 2 is less than the preset flow rate. At this time, the valve under test 5 closes, and the flow regulating component 4 operates at a preset frequency, thereby realizing a flow pulse. This causes the preset flow rate of liquid to open the valve under test 5 at the preset frequency. The valve under test 5 repeats the opening and closing action, thereby completing the fatigue test. The hydraulic valve testing device provided in this embodiment uses a flow pulse method to test the valve under test 5, which can better simulate the actual working environment of the valve, making the state of the valve in the experiment more closely resemble the state of the valve in actual operation, thus enabling high accuracy in the fatigue test of the valve.

[0044] Specifically, an inlet pump 6 can be installed on the inlet pipe 2 to pump the liquid in the storage tank 1 into the inlet pipe 2. Optionally, the inlet pump 6 can be a variable frequency pump, which can pump liquid into the inlet pipe at different flow rates by changing the pump frequency, thereby enabling fatigue testing of the same hydraulic valve under different preset flow conditions; or, in the same experiment, to achieve fatigue testing of the valve under test 5 under the combined action of different preset flow rates, that is, to simulate the complex working environment of variable liquid flow; and the preset flow rate can also be adjusted according to different specifications of hydraulic valves, thereby enabling testing of hydraulic pumps of various specifications.

[0045] The variable frequency inlet pump 6 has a working flow rate of 0-300L / min, a working temperature of 15℃-120℃, a system pressure of 0-2.5Mpa, and a frequency of 0-100Hz.

[0046] An inlet filter 7 can also be installed on the inlet pipe 2 to prevent impurities in the liquid in the storage tank 1 from entering the valve under test 5, thus preventing impurities from affecting the life of the valve under test 5 and further improving the accuracy of the test.

[0047] like Figure 2 As shown, based on the above embodiments, the hydraulic valve fatigue testing device further includes a controller, a flow measuring element 8 (such as a flow meter or flow sensor) and a pressure measuring element 9 (such as a pressure gauge or pressure sensor); the flow measuring element 8 and the pressure measuring element 9 are both located at the end of the inlet pipe 2; the flow regulating element 4, the flow measuring element 8, and the pressure measuring element 9 are all communicatively connected to the controller.

[0048] In this embodiment, a flow measuring device 8 and a pressure measuring device 9 are installed at the end of the liquid inlet pipe 2 (that is, the end of the liquid inlet pipe away from the liquid storage tank 1, or the end of the liquid inlet pipe 2 near the valve under test 5). The flow measuring device 8 is used to measure the flow rate of the liquid flowing into the valve under test 5 and transmit the measurement result to the controller. The pressure measuring device 9 is used to measure the pressure of the liquid flowing into the valve under test 5 and transmit the measurement result to the controller. By integrating the measurements, the controller can obtain the corresponding preset pressure under the preset flow rate condition, obtain more complete experimental results, and obtain the pressure pulse based on the flow pulse.

[0049] The signal of the flow rate operating frequency (preset frequency) of the valve 5 under test can be used as the horizontal axis, and the signal of the flow rate of the valve 5 under test can be used as the vertical axis, thus generating a curve of the flow rate operating frequency and flow rate of the valve 5 under test.

[0050] The variable frequency inlet pump 6 is connected to the controller. The controller can control the inlet pump 6 to change the frequency, thereby changing the flow rate of the liquid pumped into the inlet pipe 2.

[0051] Based on the above embodiments, further, the flow regulating component 4 can reduce the preset flow rate of the liquid in the inlet pipe 2 at a preset frequency to form a flow pulse in various ways. For example, the flow regulating component 4 can be a quick-change valve such as an electric valve, which is installed on the inlet pipe 2 and connected in series with the valve under test 5. The opening and closing of the valve realizes the opening and closing of the inlet pipe, thereby realizing the intermittent supply of the preset flow rate of liquid to the valve under test 5, that is, realizing the flow pulse. The valve opens and closes at a preset frequency, thereby realizing the supply of the preset flow rate of liquid to the valve under test 5 at a preset frequency. Alternatively, the flow regulating component 4 can be a regulating valve such as an electric regulating valve or an electromagnetic regulating valve. The flow rate of the liquid supplied to the valve under test 5 is adjusted by changing the opening degree of the regulating valve. When the regulating valve is fully open, the flow rate of the liquid supplied to the valve under test 5 is the preset flow rate. When the opening degree of the regulating valve decreases, the flow rate of the liquid supplied to the valve under test 5 is less than the preset flow rate.

[0052] As a preferred embodiment, the inlet of the flow regulating component 4 is connected to the inlet pipe 2, and the outlet of the flow regulating component 4 is connected to the storage tank 1. In this embodiment, the flow regulating component 4 is connected in parallel with the valve under test 5 to divert the liquid in the inlet pipe 2, that is, to divert the liquid flowing to the valve under test 5. The flow regulating component 4 operates at a preset frequency, thereby achieving the diversion of the liquid in the inlet pipe 2 at a preset frequency. In other words, the diversion and non-diversion of the liquid in the inlet pipe occur alternately. When the liquid in the inlet pipe is not diverted, the liquid in the inlet pipe is sent to the valve under test 5 at a preset flow rate. When the liquid in the inlet pipe is diverted, the liquid is intermittently delivered to the valve under test 5 at a preset flow rate. This method avoids directly cutting off the preset flow rate of liquid, and only controls the diversion. The diverted flow rate is less than the preset flow rate, and the pressure of the diverted liquid is also less than the pressure of the liquid at the preset flow rate, making the control process easier to implement and easier to control.

[0053] The regulating component can have various structural forms. For example, the flow regulating component 4 can be a solenoid valve 41 that communicates with the controller, or an electric rotary valve 42 that communicates with the controller. In this embodiment, either a solenoid valve 41 or an electric rotary valve 42 is used for convenient control. The frequency of the solenoid valve 41 can be 0-0.35Hz, and the frequency of the electric rotary valve 42 can be 0-2Hz.

[0054] For example, the flow regulating component 4 includes a solenoid valve 41 and an electric rotary valve 42, which are connected in parallel. In this embodiment, both the solenoid valve 41 and the electric rotary valve 42 are connected in parallel with the valve under test 5. This allows the solenoid valve 41 to operate, or the electric rotary valve 42 to operate, or both the solenoid valve and the electric rotary valve 42 to operate, depending on the requirements of the control, to achieve more complex control.

[0055] The solenoid valve 41 or the electric rotary valve 42 is connected to the controller for communication. By controlling the opening and closing of the solenoid valve 41 or the electric rotary valve 42, automated testing can be achieved.

[0056] Specifically, valves can be installed on the inlet pipe 2 to control whether the liquid in the storage tank 1 flows into the inlet pipe 2, thus controlling the overall liquid flow of the testing device. For example, a first inlet valve 10 can be installed in front of the first filter (the side of the filter closest to the storage tank 1 is considered the front), and a second inlet valve 11 can be installed behind the first filter. Pressure measuring elements 9, such as pressure sensors, can also be installed at the branching points of the inlet pipe 2. A flow regulating valve 14 can also be installed between the flow regulating element 4 and the storage tank 1 to cut off or connect the pipeline between the flow regulating element 4 and the storage tank 1. A third inlet valve 13 can also be installed at the very end of the inlet pipe 2 (located behind the temperature measuring element and pressure measuring element 9). An outlet valve 15 can also be installed on the return pipe 3 to open or close the return pipe 3. A drain valve can also be installed on the storage tank 1 to facilitate the replacement of the liquid in the storage tank 1. A liquid level sensor 16 can also be installed in the storage tank 1 to detect the liquid level in the storage tank 1, preventing insufficient liquid in the storage tank 1 from affecting the test.

[0057] like Figure 3 As shown, based on the above embodiments, the hydraulic valve fatigue testing device further includes a heater 17 and a first temperature measuring element 18 (such as a thermometer or temperature sensor). The heater 17 is disposed on the liquid storage tank 1, and the first temperature measuring element 18 is disposed on the liquid storage tank to measure the liquid temperature in the liquid storage tank 1. Both the heater 17 and the first temperature measuring element 18 are communicatively connected to the controller.

[0058] In this embodiment, the heater 17 is controlled by the controller to heat the liquid in the storage tank 1, thereby raising the liquid in the storage tank 1 to a set temperature. The valve under test is then tested at a certain temperature, allowing fatigue testing of the valve 5 under test at different temperatures. The first temperature sensor measures the temperature of the liquid in the storage tank 1 and sends the measurement result to the controller. When the controller analyzes and determines that the current temperature of the liquid has reached the set temperature, it controls the heater 17 to stop working.

[0059] like Figure 3 As shown, based on the above embodiments, the hydraulic valve testing device further includes a second temperature measuring element 19 that is communicatively connected to the controller. The second temperature measuring element 19 is disposed at the end of the liquid inlet pipe 2 to measure the liquid temperature in the liquid inlet pipe 2.

[0060] In this embodiment, a second temperature measuring element 19 is installed at the end of the liquid inlet pipe 2 to measure the temperature of the liquid at the inlet of the valve under test 5, thereby obtaining the actual temperature of the liquid entering the valve under test 5. This avoids the liquid cooling down during the flow process, which would affect the test results, and thus allows for more accurate test results.

[0061] like Figure 4 As shown, based on the above embodiments, the hydraulic valve testing device further includes a cooling pipe 20, a cooling circulation pump 21, and a radiator 22. One end of the cooling pipe 20 is connected to the cooling outlet of the liquid storage tank, and the other end is connected to the cooling inlet of the liquid storage tank. The cooling circulation pump 21 and the radiator 22 are connected in series on the cooling pipe 20.

[0062] In this embodiment, after the valve 5 under test is tested at a certain temperature, the liquid in the storage tank 1 has a certain temperature. If it is desired to test the valve 5 under test at a lower liquid temperature, the natural cooling rate of the liquid in the storage tank 1 is slow. A cooling pump is set up to pump the liquid in the storage tank 1 into the cooling pipe. The liquid to be cooled flows through the radiator 22, and the radiator 22 cools the liquid to be cooled. The cooled liquid flows back to the storage tank 1, and this cycle continues until the temperature of the liquid in the storage tank 1 drops to the set temperature. Cooling the liquid through the radiator 22 can improve the cooling speed and efficiency of the liquid in the storage tank 1.

[0063] The radiator 22 can be a simple and low-cost air-cooled structure, or other types of radiators 22 can be used.

[0064] Specifically, a cooling valve 24 and a cooling filter 23 can be installed on the cooling pipe. The cooling valve 24 and the cooling filter 23 are located on the pipe section between the radiator 22 and the liquid storage tank 1. The cooling valve 24 controls the outflow of liquid in the liquid storage tank 1, and the cooling filter 23 can filter out impurities in the liquid to avoid impurities affecting the life of the radiator 22. It also makes the liquid that re-enters the liquid storage tank 1 cleaner, and further prevents impurities from entering the test valve 5 when the liquid flows into the test valve 5.

[0065] Based on the above embodiments, the hydraulic fatigue testing device may further include a human-machine interface that is communicatively connected to the controller. Users can input commands or test condition parameters through the human-machine interface, thereby enabling the controller to control the operation of various components.

[0066] The following describes the usage process of the hydraulic fatigue testing device provided by this invention:

[0067] The first inlet valve 10, the second inlet valve 11, the third inlet valve 13, the diversion valve, and the outlet valve 15 are all in the open position;

[0068] The pulse frequency can be set according to the actual test requirements through the human-machine interface, and the solenoid valve 41 or the electric rotary valve 42 can be selected for control.

[0069] Set the upper and lower limits of the traffic flow according to the actual test requirements through the human-machine interface;

[0070] The frequency of the inlet pump 6 can be set according to the actual test requirements through the human-machine interface. A relatively small frequency can be set at first, and the frequency can be readjusted after the test starts to achieve the required flow rate.

[0071] Before starting the machine, first turn on the heating elements of the liquid inlet pump 6 and the liquid storage tank 1 (to meet the set temperature requirements);

[0072] After powering on, the test begins. Adjust the frequency of the inlet pump 6 to achieve the required preset flow rate.

[0073] The controller records and saves the flow pulse signal collected by the flow measurement element 8 and the pressure pulse signal collected by the pressure measurement element 9;

[0074] The number of flow pulses (the number of times the tested valve 5 has been switched on and off) when the tested valve 5 is damaged is the valve's fatigue life (or the test stops after the tested valve 5 has been switched on and off a set number of times).

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0076] Furthermore, those skilled in the art will understand that although some of the above embodiments include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments can be used in any combination. Additionally, the information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A fatigue testing device for a hydraulic valve, characterized in that, include: The system includes a liquid storage tank, an inlet pipe, a return pipe, and a flow regulating device. One end of the inlet pipe is connected to the outlet of the liquid storage tank, and the other end is connected to the inlet of the valve under test. One end of the return pipe is connected to the inlet of the liquid storage tank, and the other end is connected to the outlet of the valve under test. A variable frequency inlet pump is installed on the inlet pipe to pump liquid from the liquid storage tank into the inlet pipe. The flow regulating device reduces the preset flow rate of the liquid in the inlet pipe at a preset frequency to form a flow pulse. The inlet of the flow regulating component is connected to the liquid inlet pipe, and the outlet of the flow regulating component is connected to the liquid storage tank; the flow regulating component includes a solenoid valve and an electric rotary valve, which are arranged in parallel.

2. The hydraulic valve fatigue testing device according to claim 1, characterized in that, It includes a controller, a flow measuring device, and a pressure measuring device; the flow measuring device and the pressure measuring device are both located at the end of the liquid inlet pipe; the flow regulating device, the flow measuring device, and the pressure measuring device are all communicatively connected to the controller.

3. The hydraulic valve fatigue testing device according to claim 2, characterized in that, The flow control components are a solenoid valve and an electric rotary valve that are communicatively connected to the controller.

4. The hydraulic valve fatigue testing device according to claim 2 or 3, characterized in that, It also includes a heater and a first temperature measuring device. The heater is disposed on the liquid storage tank, and the first temperature measuring device is disposed on the liquid storage tank to measure the liquid temperature in the liquid storage tank. Both the heater and the first temperature measuring device are communicatively connected to the controller.

5. The hydraulic valve fatigue testing device according to claim 4, characterized in that, It also includes a second temperature measuring device that is communicatively connected to the controller. The second temperature measuring device is disposed at the end of the liquid inlet pipe to measure the liquid temperature inside the liquid inlet pipe.

6. The hydraulic valve fatigue testing device according to claim 4, characterized in that, It also includes a cooling pipe, a cooling circulation pump and a radiator. One end of the cooling pipe is connected to the cooling outlet of the liquid storage tank and the other end is connected to the cooling inlet of the liquid storage tank. The cooling circulation pump and the radiator are connected in series on the cooling pipe.

7. A method for testing the fatigue of a hydraulic valve based on the hydraulic valve fatigue testing device according to any one of claims 1 to 6, characterized in that, include: Connect the valve under test between the inlet line and the return line; A preset flow rate of liquid is supplied to the valve under test at a preset frequency; The process of supplying a preset flow rate of liquid to the valve under test at a preset frequency specifically includes: The preset flow rate of liquid is continuously supplied to the inlet pipeline; The liquid in the inlet pipeline is diverted at the preset frequency by a flow regulating device; The flow regulating component includes a solenoid valve and an electric rotary valve, which are connected in parallel. One or both of the solenoid valve and the electric rotary valve can be selected to operate as needed.

Images