Hydraulic stamping integrated valve lock type neutral position leakage rate high-precision test system and method

Abstract

The invention discloses a high-precision testing system and method for the leakage rate of a valve lock type neutral position integrated with hydraulic stamping. The high-precision testing system comprises a power module, a control module, a stamping module, a testing module and a data processing module. The power module comprises a main pump which is communicated with the oil tank; the control module comprises a three-position two-way electromagnetic valve and a first electromagnetic valve; a to-be-stamped balance valve workpiece is mounted on the stamping module; the test module comprises a test station and a test workpiece, the test station is provided with a to-be-tested valve workpiece, the test workpiece is internally provided with a test element and a displacement sensor, and the displacement sensor is electrically connected with the data processing module; by measuring the oil inlet flow at the loading port of the to-be-tested valve workpiece, the actual application working condition of engineering can be simulated, the measurement error caused by insufficient pressure release in the to-be-tested valve workpiece and the pipe joint, long oil return port pipeline and the like is avoided, the test result is accurate and reliable, and meanwhile, the manufacturing cost of the test workpiece is relatively low, so that the test efficiency is greatly improved. And the test cost can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic stamping, and in particular to a high-precision testing system and method for the mid-position leakage of valve locks integrated with hydraulic stamping. Background Art

[0002] As a necessary safety part for construction machinery such as cranes and aerial platforms, the leakage of the balancing valve is directly related to the performance of the vehicle and the safety of the driver. The leakage of the balancing valve is the leakage at the main valve core and the cone seal of the check valve, which has extremely high requirements. Most manufacturers will stamp the mating surfaces of the check valve and the main valve core before assembly, and then assemble them inside the valve body in the form of a valve core assembly after stamping. When using this stamping method, the coaxiality of the check valve and the valve core in the stamping state is required to be high. At the same time, the positioning and stamping state of the secondary assembly after press-fitting are inconsistent, which will lead to the problem of insignificant increase in leakage level.

[0003] At the same time, the accuracy of leakage measurement is also a problem faced by major hydraulic component manufacturers. For safety parts with extremely high leakage requirements such as balancing valves and explosion-proof valves, national standards and the operating conditions of the whole machine require that their leakage levels are generally less than 5 drops / min. For excavators, their operating conditions are becoming more and more complicated. It is not only for excavation and leveling operations, but also for refined lifting operations. Under these conditions, the leakage requirements of multi-way valves and actuators are extremely high. Especially for micro excavators, the diameter of their actuator cylinders is smaller, and they are more sensitive to the leakage of multi-way valves. At present, most manufacturers will detect the leakage of multi-way valves by adding flow sensors before and after the multi-way valves when testing the multi-way valves at the factory. However, due to the error of the flow meter, the measurement accuracy is poor for the multi-way valves of micro excavators with internal leakage requirements less than 1.5ml / min. Summary of the invention

[0004] In view of this, the present invention provides a high-precision testing system for mid-position leakage of valve locks integrated with hydraulic stamping, which can improve the pressing effect of the valve core assembly in the balancing valve and, at the same time, can also improve the accuracy of the internal leakage test results of the balancing valve.

[0005] To achieve the above object, the present invention provides the following technical solutions: A high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping, comprising: a power module, a control module, a stamping module, a test module and a data processing module.

[0006] Among them, the power module includes a main pump, which is connected to the oil tank; the control module includes a three-position two-way solenoid valve and a first solenoid valve; the stamping module is equipped with a balance valve workpiece to be stamped; the test module includes a test station and a test workpiece, the test station is equipped with a valve workpiece to be tested, and a test element and a displacement sensor are arranged inside the test workpiece. The test element is movably assembled in the internal cavity of the test workpiece, and the test element divides the internal cavity of the test workpiece into a first cavity and a second cavity. The displacement sensor is electrically connected to the data processing module, and the displacement sensor is used to detect the displacement of the test element Quantity data; when no operation is performed, the three-position two-way solenoid valve is in the middle position, and the first solenoid valve is disconnected, and the system oil circuit is disconnected; when stamping operation is performed, the three-position two-way solenoid valve is in the left position, and the main pump is connected to the oil inlet of the balance valve workpiece to be stamped through the three-position two-way solenoid valve; when testing operation is performed, the three-position two-way solenoid valve is in the right position, and the first solenoid valve is connected, and the main pump is connected to the first cavity through the three-position two-way solenoid valve and the first solenoid valve in sequence, and the second cavity is connected to the loading port of the valve workpiece to be tested. At this time, the internal oil circuit channel at the loading port of the valve workpiece to be tested is disconnected.

[0007] Preferably, the integrated hydraulic stamping valve lock type mid-position leakage high-precision test system also includes a heating module, which is used to heat the hydraulic oil in the oil tank; the power module also includes a pilot pump, which is connected to the oil tank; the control module also includes a second solenoid valve; when the valve workpiece to be tested is subjected to cyclic heating operation, the heating module is started, the three-position two-way solenoid valve is in the right position, the first solenoid valve is disconnected, and the second solenoid valve is connected, the main pump is connected to the oil inlet of the valve workpiece to be tested through the three-position two-way solenoid valve, the pilot pump is connected to the pilot port of the valve workpiece to be tested through the second solenoid valve, and the loading port of the valve workpiece to be tested is connected to the oil tank.

[0008] Preferably, the control module further includes a first overflow valve and a second overflow valve, the main pump is connected to the oil tank through the first overflow valve, and the pilot pump is connected to the oil tank through the second overflow valve.

[0009] Preferably, the control module further includes a pressure reducing valve, and the pilot pump is connected to the oil tank via the pressure reducing valve.

[0010] Preferably, the test workpiece includes a valve body, a cylinder rod assembly, a screw plug assembly, a screw plug and a displacement sensor; the valve body has a hydraulic cavity that passes through from front to back, and the front end opening of the hydraulic cavity is closed by installing the screw plug; the cylinder rod assembly is the test element, and the cylinder rod assembly includes a cylinder rod, which is movably assembled in the hydraulic cavity through the rear end opening of the hydraulic cavity, and the rear end of the cylinder rod has an annular flange, which separates the hydraulic cavity into a first cavity and a second cavity; the screw plug assembly includes a screw plug, which is sleeved on the cylinder rod and installed at the rear end opening of the hydraulic cylinder; the displacement sensor is arranged inside the valve body and is electrically connected to the data processing module, and the displacement sensor is used to detect the displacement of the cylinder rod; when performing a test operation, the main pump is connected to the first cavity through the three-position two-way solenoid valve and the first solenoid valve in sequence, and the loading port of the valve workpiece to be tested is connected to the second cavity.

[0011] Preferably, the cylinder rod assembly further comprises a Gly ring, an annular sealing groove is provided on the annular flange, and the Gly ring is installed in the annular sealing groove.

[0012] Preferably, the screw plug assembly further includes a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are respectively arranged in two sealing grooves in the screw plug.

[0013] Preferably, the test workpiece further includes a third overflow valve, an overflow channel is provided in the valve body, one end of the third overflow valve is connected to the first cavity through the overflow channel, and the other end of the third overflow valve is connected to the oil tank.

[0014] A high-precision test method for the median leakage of a valve lock type integrated with hydraulic stamping is applied to the above-mentioned high-precision test system for the median leakage of a valve lock type integrated with hydraulic stamping, and specifically includes the following contents: Stamping operation method: start the main pump, adjust the three-position two-way solenoid valve to the left position, adjust the pressure and flow of the main pump to the required value, and the hydraulic oil is continuously pumped into the oil inlet of the balance valve workpiece to be stamped through the three-position two-way solenoid valve to stamp the balance valve workpiece to be stamped; Circulation heating operation method: start the main pump, pilot pump and heating module, adjust the three-position two-way solenoid valve to the right position, disconnect the first solenoid valve and connect the second solenoid valve, the main pump continuously pumps the hydraulic oil into the oil inlet of the valve workpiece to be tested, and the pilot pump continuously pumps the hydraulic oil into the pilot port of the valve workpiece to be tested. The hydraulic oil entering the pilot port causes the valve workpiece to be tested to reverse, so that the hydraulic oil entering the oil inlet can flow to the loading port of the valve workpiece to be tested, and flow back to the oil tank from the loading port, thereby realizing circulation heating of the valve workpiece to be tested; Test operation method: start the main pump and the heating module, adjust the three-position two-way solenoid valve to the right position, connect the first solenoid valve and disconnect the second solenoid valve, connect the loading port of the valve workpiece to be tested to the first cavity of the test workpiece, and continuously pump the hydraulic oil into the second cavity of the test workpiece. The displacement sensor in the test workpiece continuously detects the displacement of the cylinder rod in the test workpiece, and feeds back the acquired displacement data to the data processing module, which analyzes and outputs the test data based on the displacement data.

[0015] Compared with the prior art, the present application discloses a high-precision test system for the mid-position leakage of valve locks with integrated hydraulic stamping. By measuring the oil inlet flow at the loading port of the valve workpiece to be tested, it can simulate the actual application conditions of the project and avoid measurement errors caused by insufficient pressure release inside the valve workpiece and pipe joint to be tested, long oil return pipe, etc. The test results are accurate and reliable. At the same time, since the manufacturing cost of the test workpiece is relatively low, the test cost can be effectively reduced.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping disclosed in an embodiment of the present application; Figure 2 It is a cross-sectional view of a balancing valve workpiece to be tested in the high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping disclosed in the embodiment of the present application; Figure 3 It is a structural schematic diagram of a test module of a high-precision test system for mid-position leakage of a valve lock type integrated with hydraulic stamping disclosed in an embodiment of the present application; Figure 4 It is a cross-sectional view of a test module of a high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping disclosed in an embodiment of the present application; Figure 5 It is a structural schematic diagram of a cylinder rod assembly of a high-precision test system for mid-position leakage of a valve lock type integrated with hydraulic stamping disclosed in an embodiment of the present application; Figure 6 It is a structural schematic diagram of a screw plug assembly of a high-precision test system for mid-position leakage of a valve lock type with integrated hydraulic stamping disclosed in an embodiment of the present application.

[0018] Reference numerals: 11. Main pump; 12. Pilot pump; 21. Three-position two-way solenoid valve; 22. First solenoid valve; 23. Second solenoid valve; 24. Third solenoid valve; 25. First overflow valve; 26. Second overflow valve; 27. Pressure reducing valve; 3. Test module; 31. Test workpiece; 311. Valve body; 312. Cylinder rod assembly; 313. Screw plug assembly; 314. Screw plug; 315. Third relief valve; 3121. Cylinder rod; 3122. Gly ring; 3131. First sealing ring; 3132. Second sealing ring; 4. Stamping module; 5. Heating module; 6. Data processing module; 7. Fuel tank; 8. Valve workpiece to be tested; 81. Oil inlet; 82. Pilot port; 83. Loading port; 9. Balance valve workpiece to be punched; 91. One-way valve core; 92. Main reversing valve core. DETAILED DESCRIPTION

[0019] The present invention discloses a high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping, which can improve the press-fitting effect of a valve core assembly in a balancing valve and, at the same time, can also improve the accuracy of the internal leakage test result of the balancing valve.

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] Reference below Figures 1 to 6 A high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping in an embodiment of the present invention is described.

[0023] The embodiment of the present application discloses a high-precision test system for the mid-position leakage of valve locks integrated with hydraulic stamping, including: a power module, a control module, a stamping module 4, a test module 3 and a data processing module 6.

[0024] Among them, the power module includes a main pump 11, which is connected to the oil tank 7; the control module includes a three-position two-way solenoid valve 21 and a first solenoid valve 22, both of which are used to control the on-off of the oil circuit to change the current operating state of the system; the stamping module 4 is equipped with a balance valve workpiece 9 to be stamped, and the stamping module 4 can clamp and fix the balance valve workpiece 9 to be stamped, and can ensure the stability of the stamping process; the test module 3 includes a test station and a test workpiece 31, the test station is equipped with a valve workpiece 8 to be tested, the test station can ensure the installation stability of the valve workpiece 8 to be tested, thereby ensuring the stability of the test process, and the interior of the test workpiece 31 is provided with a test element and a displacement sensor, the test element is movably assembled in the internal cavity of the test workpiece 31, the test element divides the internal cavity of the test workpiece 31 into a first cavity and a second cavity, the displacement sensor is electrically connected to the data processing module 6, the displacement sensor is used to obtain the displacement data of the test element, and the displacement sensor transmits the obtained displacement data to the data processing module 6, so that the data processing module 6 analyzes and calculates the leakage test result of the valve workpiece 8 to be tested according to the displacement data.

[0025] When the system is not operating, the three-position two-way solenoid valve 21 in the system is in the middle position, and the first solenoid valve 22 is disconnected, so that the oil circuit in the system is disconnected to ensure the safety of each module component.

[0026] When the system is performing stamping operations, the three-position two-way solenoid valve 21 in the system is in the left position, the oil circuit between the main pump 11 and the stamping module 4 is connected, and the main pump 11 is connected to the oil inlet 81 of the balancing valve workpiece 9 to be stamped through the three-position two-way solenoid valve 21. The main pump 11 can adjust the pump oil pressure and pump oil volume to the required values, and continuously pump the hydraulic oil into the balancing valve workpiece 9 to be stamped, and complete the stamping of the valve core assembly in the balancing valve workpiece 9 to be stamped by utilizing the liquid pressure of the hydraulic oil.

[0027] For example Figure 2 As shown, the hydraulic oil entering the balancing valve workpiece 9 to be stamped acts on the one-way valve core 91 in the workpiece to form a rightward hydraulic pressure to push the valve core cone surface of the one-way valve core 91 to act on the valve core cone surface of the main reversing valve. As the hydraulic pressure continues to be pressed to achieve the stamping effect, the stamping of the valve core assembly is completed.

[0028] Using hydraulic stamping to stamp the valve core assembly in the balancing valve can effectively improve the stamping effect, further reduce assembly errors, and improve the overall sealing performance of the balancing valve.

[0029] When the system is performing a test operation, the three-position two-way solenoid valve 21 is in the right position, and the first solenoid valve 22 is connected, the oil circuit between the main pump 11 and the test workpiece 31 is connected, the main pump 11 is connected to the first cavity through the three-position two-way solenoid valve 21 and the first solenoid valve 22 in sequence, and the second cavity is also connected to the loading port 83 of the valve workpiece 8 to be tested. At this time, the internal oil circuit channel at the loading port 83 of the valve workpiece 8 to be tested is disconnected.

[0030] For example Figure 4 As shown, during the test process, the main pump 11 continuously pumps the hydraulic oil into the first cavity, and the liquid pressure formed by the hydraulic oil in the first cavity acts on the test element, pushing the test element to move to the other side. Since the internal oil circuit at the loading port 83 of the valve workpiece 8 to be tested is disconnected, the hydraulic oil cannot enter the interior of the valve workpiece 8 to be tested through the loading port 83. Therefore, if there is no leakage inside the valve workpiece 8 to be tested, the test element should not be able to move. At this time, the displacement data of the test element obtained by the displacement sensor should be 0; if there is a leakage inside the valve workpiece 8 to be tested, the hydraulic oil in the second cavity can flow into the interior of the valve workpiece 8 to be tested through the loading port 83, and the test element will be displaced accordingly. At this time, the displacement sensor can obtain the displacement data of the test element and feed the data back to the data processing module 6. The data processing module 6 can analyze and calculate the leakage data of the valve workpiece 8 to be tested based on the displacement data.

[0031] By utilizing the above-mentioned testing method, the oil inlet flow at the loading port 83 of the valve workpiece 8 to be tested is measured, which can simulate the actual application conditions of the project and avoid measurement errors caused by insufficient pressure release inside the valve workpiece 8 to be tested and the pipe joint, long return oil pipe, etc. The test results are accurate and reliable. At the same time, since the manufacturing cost of the test workpiece 31 is relatively low, the testing cost can be effectively reduced.

[0032] In some embodiments, the high-precision test system for the mid-position leakage of valve locks with integrated hydraulic stamping also includes a heating module 5, which is used to heat the hydraulic oil in the oil tank 7; the power module also includes a pilot pump 12, which is connected to the oil tank 7; the control module also includes a second solenoid valve 23; when the valve workpiece 8 to be tested is subjected to cyclic heating, the heating module 5 is started, the three-position two-way solenoid valve 21 is in the right position, the first solenoid valve 22 is disconnected, and the second solenoid valve 23 is connected, the main pump 11 is connected to the oil inlet 81 of the valve workpiece 8 to be tested through the three-position two-way solenoid valve 21, the pilot pump 12 is connected to the pilot port 82 of the valve workpiece 8 to be tested through the second solenoid valve 23, and the loading port 83 of the valve workpiece 8 to be tested is connected to the oil tank 7.

[0033] During the cyclic heating process, the heating module 5 is first started to heat the hydraulic oil in the oil tank 7 so that the temperature of the hydraulic oil reaches the specified temperature; secondly, the main pump 11 and the pilot pump 12 are started, the main pump 11 continuously pumps the hydraulic oil to the oil inlet 81 of the valve workpiece 8 to be tested, and the pilot pump 12 continuously pumps the hydraulic oil to the pilot port 82 of the valve workpiece 8 to be tested, and the hydraulic pressure of the hydraulic oil entering the inside of the valve workpiece 8 to be tested from the pilot port 82 acts on the valve core assembly to make the valve workpiece 8 to be tested reverse, so that the oil path between the oil inlet 81 and the loading port 83 of the valve workpiece 8 to be tested is connected, and then the hydraulic oil pumped into the oil inlet 81 by the main pump 11 can continuously flow to the loading port 83, and flow back to the oil tank 7 through the loading port 83. At this point, a heating cycle is formed, and after the hydraulic oil continuously circulates, the oil ports of the valve workpiece 8 to be tested are gradually heated to the specified working temperature, so as to facilitate the subsequent leakage test and ensure the accuracy of the test.

[0034] In the prior art, multi-way valves have different numbers of links. Generally, one link of a multi-way valve is arranged with two loading ports and two pilot ports. Similarly, two links are arranged with four loading ports and four pilot ports, and the same applies to three links, four links or five links. In one link of the multi-way valve, hydraulic oil enters the valve body through one of the two pilot ports, which can cause the multi-way valve to switch, thereby connecting the oil path between the corresponding loading port and the oil inlet.

[0035] For example Figure 1 As shown, the valve workpiece 8 to be tested on the test station is a multi-way valve, and the number of the multi-way valve is two, and each of the two links is arranged with two loading ports 83 and two pilot ports 82; when performing the circulating heating operation, the pilot pump 12 divides the two oil circuits into two oil circuits, which are first connected to the two pilot ports 82 located on the same side of the two links respectively, so as to complete the heating of the corresponding loading ports 83 in the two links, and then, the two oil circuits are respectively connected to the remaining pilot ports 82 in the two links, so as to complete the heating of the remaining loading ports 83 in the two links, so that the heating of all the oil ports in the multi-way valve can be completed by switching directions twice in succession; in addition, in order to facilitate heating, the second solenoid valve 23 can be set as a three-position four-way solenoid valve, and when the three-position four-way solenoid valve is in the left position or the right position, the pilot pump 12 is respectively connected to one pilot port 82 in each of the two links.

[0036] In some embodiments, for example Figure 1 As shown, the control module further includes a third solenoid valve 24 , which is disposed between the three-position two-way solenoid valve 21 and the first solenoid valve 22 . The provision of the third solenoid valve 24 can enhance the protection of the system oil circuit.

[0037] In some embodiments, for example Figure 1As shown, the control module also includes a first relief valve 25 and a second relief valve 26. The main pump 11 is connected to the oil tank 7 through the first relief valve 25, and the pilot pump 12 is connected to the oil tank 7 through the second relief valve 26. The setting of the first relief valve 25 and the second relief valve 26 can protect the system oil circuit from overload. When the pressure in the system oil circuit is too high, the hydraulic oil can flow back to the oil tank 7 through the first relief valve 25 or the second relief valve 26 to protect the safety of the system oil circuit.

[0038] In some embodiments, for example Figure 1 As shown, the control module also includes a pressure reducing valve 27, and the pilot pump 12 is connected to the oil tank 7 through the pressure reducing valve 27. The setting of the pressure reducing valve 27 can further increase the overload protection of the system oil circuit and prevent the system oil circuit from being damaged due to excessive pressure of the hydraulic oil.

[0039] In some embodiments, the test workpiece 31 includes a valve body 311, a cylinder rod assembly 312, a screw plug assembly 313, a screw plug 314 and a displacement sensor; the valve body 311 has a hydraulic cavity that runs through the front and back, and the front end opening of the hydraulic cavity is closed by installing a screw plug 314, which can prevent leakage of hydraulic oil; the cylinder rod assembly 312 is a test element, and the cylinder rod assembly 312 includes a cylinder rod 3121, and the cylinder rod 3121 is movably assembled in the hydraulic cavity through the rear end opening of the hydraulic cavity, and the rear end of the cylinder rod 3121 has an annular flange, and the annular flange separates the hydraulic cavity into a first cavity and a second cavity; the screw plug assembly 313 includes a screw plug, which is sleeved on the cylinder rod 3121 and installed at the rear end opening of the hydraulic cylinder to prevent leakage of hydraulic oil; the displacement sensor is arranged inside the valve body 311 and is electrically connected to the data processing module 6, and the displacement sensor is used to detect the displacement of the cylinder rod 3121.

[0040] When the test operation is performed, the main pump 11 is connected to the first cavity through the three-position two-way solenoid valve 21 and the first solenoid valve 22 in sequence, and the loading port 83 of the valve workpiece 8 to be tested is connected to the second cavity; after the main pump 11 is started, the hydraulic oil is continuously pumped into the first cavity, and the hydraulic pressure of the hydraulic oil in the first cavity acts on the front end surface of the cylinder rod 3121 to push the cylinder rod 3121 to move backward. At this time, the second cavity is connected to the loading port 83, and the internal oil passage at the loading port 83 is disconnected. Therefore, when the cylinder rod 3121 tends to move backward, due to the liquid in the second cavity The pressurized oil cannot flow out through the loading port 83, resulting in the cylinder rod 3121 being unable to move backward. After a period of testing, if part of the hydraulic oil in the second cavity flows into the inside of the valve workpiece 8 to be tested through the loading port 83, the cylinder rod 3121 will inevitably be displaced backward under the action of the hydraulic pressure of the hydraulic oil in the first cavity. When the test is completed, the displacement sensor will feed back the displacement data of the cylinder rod 3121 during the test to the data processing module 6, so that the data processing module 6 can analyze and calculate the leakage data of the valve workpiece 8 to be tested, and obtain the leakage level of the valve workpiece 8 to be tested.

[0041] In this embodiment, the cavity diameter of the hydraulic cavity in the test workpiece 31, the rod diameter of the cylinder rod 3121 and the stroke of the test workpiece 31 can be set to different parameters according to the actual project, and the displacement of the cylinder rod 3121 is converted into leakage data. In this way, the test workpiece 31 can perform internal leakage measurement on valve workpieces 8 of different specifications, and the internal leakage measurement range is large.

[0042] In this embodiment, if the valve workpiece 8 to be tested is a multi-way valve, the number of hydraulic chambers and cylinder rod assemblies 312 in the test workpiece 31 can be adjusted according to the number of connections of the multi-way valve, for example Figure 1 As shown, the number of links of the multi-way valve on the test station is two, and each link is arranged with two loading ports 83, so there are two hydraulic chambers in the test workpiece 31, and there are two groups of cylinder rod assemblies 312, which can perform internal leakage tests on the two loading ports 83 at the same time. When testing, the loading ports 83 on the same side of each link are tested first, and then the loading ports 83 on the other side are tested. In this way, the test efficiency can be effectively improved.

[0043] In this embodiment, the cylinder rod assembly 312 also includes a Gly ring 3122, an annular sealing groove is provided on the annular flange, and the Gly ring 3122 is installed in the annular sealing groove; when the cylinder rod 3121 moves in the hydraulic cavity, the Gly ring 3122 can form a sliding seal to prevent the hydraulic oil in the first cavity from leaking into the second cavity, thereby ensuring the accuracy of the test results.

[0044] In this embodiment, the screw plug assembly 313 also includes a first sealing ring 3131 and a second sealing ring 3132. The first sealing ring 3131 and the second sealing ring 3132 are respectively arranged in two sealing grooves in the screw plug. The arrangement of the first sealing ring 3131 and the second sealing ring 3132 can effectively improve the sealing performance of the screw plug, thereby further preventing the leakage of hydraulic oil.

[0045] In this embodiment, the test workpiece 31 also includes a third overflow valve 315, an overflow channel is provided in the valve body 311, one end of the third overflow valve 315 is connected to the first cavity through the overflow channel, and the other end is connected to the oil tank 7; the third overflow valve 315 can perform overload protection on the test workpiece 31 to prevent the test workpiece 31 from being damaged by excessive internal pressure.

[0046] In addition, the present application also discloses a method for testing the median leakage of a valve lock type integrated with hydraulic stamping, which is applied to the high-precision testing system for the median leakage of a valve lock type integrated with hydraulic stamping disclosed in the above embodiment, and specifically includes the following contents: Stamping operation method: start the main pump 11, adjust the three-position two-way solenoid valve 21 to the left position, adjust the pressure and flow of the main pump 11 to the required value, and the hydraulic oil is continuously pumped into the oil inlet 81 of the balance valve workpiece 9 to be stamped through the three-position two-way solenoid valve 21 to stamp the balance valve workpiece 9 to be stamped.

[0047] Circulation heating operation method: start the main pump 11, the pilot pump 12 and the heating module 5, adjust the three-position two-way solenoid valve 21 to the right position, disconnect the first solenoid valve 22 and connect the second solenoid valve 23, the main pump 11 continuously pumps the hydraulic oil into the oil inlet 81 of the valve workpiece 8 to be tested, and the pilot pump 12 continuously pumps the hydraulic oil into the pilot port 82 of the valve workpiece 8 to be tested. The hydraulic oil entering at the pilot port 82 causes the valve workpiece 8 to be tested to reverse, so that the hydraulic oil entering at the oil inlet 81 can flow to the loading port 83 of the valve workpiece 8 to be tested, and flow back to the oil tank 7 from the loading port 83, thereby realizing the circulation heating of the valve workpiece 8 to be tested.

[0048] Test operation method: start the main pump 11 and the heating module 5, adjust the three-position two-way solenoid valve 21 to the right position, connect the first solenoid valve 22 and disconnect the second solenoid valve 23, connect the loading port 83 of the valve workpiece 8 to be tested to the first cavity of the test workpiece 31, and continuously pump the hydraulic oil into the second cavity of the test workpiece 31. The displacement sensor in the test workpiece 31 continuously detects the displacement of the cylinder rod 3121 in the test workpiece 31, and feeds back the acquired displacement data to the data processing module 6. The data processing module 6 analyzes and outputs the test data based on the displacement data.

[0049] Other structures and operations of the high-precision testing system and method for mid-position leakage of valve locks integrated with hydraulic stamping according to the embodiment of the present invention are well known to those of ordinary skill in the art and will not be described in detail here.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping, characterized in that: include: Power module, control module, stamping module, test module and data processing module; The power module includes a main pump, which is connected to the oil tank; the control module includes a three-position two-way solenoid valve and a first solenoid valve; the stamping module is equipped with a balance valve workpiece to be stamped; the test module includes a test station and a test workpiece, the test station is equipped with a valve workpiece to be tested, a test element and a displacement sensor are arranged inside the test workpiece, the test element is movably assembled in the internal cavity of the test workpiece, the test element divides the internal cavity of the test workpiece into a first cavity and a second cavity, the displacement sensor is electrically connected to the data processing module, and the displacement sensor is used to detect the displacement data of the test element; When no operation is performed, the three-position two-way solenoid valve is in the middle position, the first solenoid valve is disconnected, and the system oil circuit is disconnected; When the stamping operation is performed, the three-position two-way solenoid valve is in the left position, and the main pump is connected to the oil inlet of the balancing valve workpiece to be stamped through the three-position two-way solenoid valve; When performing a test operation, the three-position two-way solenoid valve is in the right position, and the first solenoid valve is connected. The main pump is connected to the first cavity through the three-position two-way solenoid valve and the first solenoid valve in sequence, and the second cavity is connected to the loading port of the valve workpiece to be tested. At this time, the internal oil circuit at the loading port of the valve workpiece to be tested is disconnected.

2. The high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping according to claim 1 is characterized in that: It also includes a heating module, which is used to heat the hydraulic oil in the oil tank; the power module also includes a pilot pump, which is connected to the oil tank; the control module also includes a second solenoid valve; When the valve workpiece to be tested is subjected to cyclic heating, the heating module is started, the three-position two-way solenoid valve is in the right position, the first solenoid valve is disconnected, the second solenoid valve is connected, the main pump is connected to the oil inlet of the valve workpiece to be tested through the three-position two-way solenoid valve, the pilot pump is connected to the pilot port of the valve workpiece to be tested through the second solenoid valve, and the loading port of the valve workpiece to be tested is connected to the oil tank.

3. The high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping according to claim 2 is characterized in that: The control module further includes a first relief valve and a second relief valve, the main pump is connected to the oil tank through the first relief valve, and the pilot pump is connected to the oil tank through the second relief valve.

4. The high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping according to claim 2 is characterized in that: The control module further includes a pressure reducing valve, through which the pilot pump is communicated with the oil tank.

5. The high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping according to claim 1 is characterized in that: The test workpiece includes a valve body, a cylinder rod assembly, a screw plug assembly, a screw plug and a displacement sensor; The valve body has a hydraulic cavity that passes through from front to back, and the front end opening of the hydraulic cavity is closed by installing the screw plug; the cylinder rod assembly is the test element, and the cylinder rod assembly includes a cylinder rod, and the cylinder rod is movably assembled in the hydraulic cavity through the rear end opening of the hydraulic cavity, and the rear end of the cylinder rod has an annular flange, and the annular flange divides the hydraulic cavity into a first cavity and a second cavity; the screw plug assembly includes a screw plug, and the screw plug is sleeved on the cylinder rod and installed at the rear end opening of the hydraulic cylinder; the displacement sensor is arranged inside the valve body and is electrically connected to the data processing module, and the displacement sensor is used to detect the displacement of the cylinder rod; When the test operation is performed, the main pump is connected to the first cavity through the three-position two-way solenoid valve and the first solenoid valve in sequence, and the loading port of the valve workpiece to be tested is connected to the second cavity.

6. The high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping according to claim 5 is characterized in that: The cylinder rod assembly further comprises a Gly ring, an annular sealing groove is arranged on the annular flange, and the Gly ring is installed in the annular sealing groove.

7. The high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping according to claim 5 is characterized in that: The screw plug assembly also includes a first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring are respectively arranged in two sealing grooves in the screw plug.

8. The high-precision test system for mid-position leakage of valve locks integrated with hydraulic stamping according to claim 5 is characterized in that: The test workpiece further includes a third overflow valve, wherein an overflow channel is arranged in the valve body, one end of the third overflow valve is connected to the first cavity through the overflow channel, and the other end of the third overflow valve is connected to the oil tank.

9. A high-precision test method for mid-position leakage of valve locks with integrated hydraulic stamping, characterized in that: The high-precision test system for mid-position leakage of valve locks used in the above-mentioned integrated hydraulic stamping includes the following contents: Stamping operation method: start the main pump, adjust the three-position two-way solenoid valve to the left position, adjust the pressure and flow of the main pump to the required value, and the hydraulic oil is continuously pumped into the oil inlet of the balance valve workpiece to be stamped through the three-position two-way solenoid valve to stamp the balance valve workpiece to be stamped; Circulation heating operation method: start the main pump, pilot pump and heating module, adjust the three-position two-way solenoid valve to the right position, disconnect the first solenoid valve and connect the second solenoid valve, the main pump continuously pumps the hydraulic oil into the oil inlet of the valve workpiece to be tested, and the pilot pump continuously pumps the hydraulic oil into the pilot port of the valve workpiece to be tested. The hydraulic oil entering the pilot port causes the valve workpiece to be tested to reverse, so that the hydraulic oil entering the oil inlet can flow to the loading port of the valve workpiece to be tested, and flow back to the oil tank from the loading port, thereby realizing circulation heating of the valve workpiece to be tested; Test operation method: start the main pump and the heating module, adjust the three-position two-way solenoid valve to the right position, connect the first solenoid valve and disconnect the second solenoid valve, connect the loading port of the valve workpiece to be tested to the first cavity of the test workpiece, and continuously pump the hydraulic oil into the second cavity of the test workpiece. The displacement sensor in the test workpiece continuously detects the displacement of the cylinder rod in the test workpiece, and feeds back the acquired displacement data to the data processing module, which analyzes and outputs the test data based on the displacement data.

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