A solenoid valve test tool and system for solenoid valve performance testing

Abstract

This application provides a solenoid valve testing fixture and a system for testing the performance of solenoid valves, belonging to the technical field of automotive component testing equipment. The solenoid valve testing fixture is equipped with a sealing surface that can interfere with the solenoid valve, changing the line contact seal to a surface contact seal. This significantly increases the effective pressure-bearing area and effectively reduces the leakage rate. Furthermore, the ejection mechanism, which includes support and drive components, changes the "riveting → knocking" process to "axial pushing," significantly shortening the single disassembly and assembly time and effectively reducing testing costs.

Description

Technical Field

[0001] This application relates to the field of automotive component testing equipment technology, and more specifically, to a solenoid valve testing fixture and a system for testing the performance of solenoid valves. Background Technology

[0002] In a car's hydraulic brake-by-wire system, the sealing performance of solenoid valves (such as the normally open valves in the OneBox system) directly affects braking safety.

[0003] In existing technologies, during solenoid valve testing, the filter seat of the solenoid valve typically achieves a seal with the tooling using a sealing ring. However, because the effective length of the sealing surface between the filter seat and the tooling is extremely short, the seal often fails during high-pressure testing due to insufficient sealing contact area. Therefore, it is necessary to use an interference fit between the filter seat and the tooling to form a seal.

[0004] However, if an interference fit is used, the solenoid valve needs to be press-fitted into the test fixture each time it is tested. After the test is completed, it is difficult to remove the solenoid valve from the fixture, and additional tools are needed to knock it out. This not only makes it very difficult to disassemble the solenoid valve, but also easily damages the parts. Utility Model Content

[0005] This application provides a solenoid valve testing fixture and a system for testing solenoid valve performance. The solenoid valve testing fixture has a sealing surface that can interfere with the solenoid valve, changing the line contact seal to a surface contact seal. This significantly increases the effective pressure-bearing area and effectively reduces the leakage rate. Furthermore, the ejection mechanism, which includes support and drive components, changes the "riveting → knocking" process to "axial pushing," significantly shortening the single disassembly and assembly time and effectively reducing testing costs. Simultaneously, because the ejection mechanism presses against the bottom filter screen near the solenoid valve filter seat, the ejection force directly acts on the rigid area closest to the sealing part of the component. This avoids problems such as surface deformation, scratches, or plating peeling caused by traditional knocking of the valve body shell or upper flange, as well as misalignment of internal precision parts due to impact. Specifically: The first aspect of this application provides a solenoid valve testing fixture, including: The mounting block has a mounting cavity for accommodating the solenoid valve. The mounting cavity is provided with a sealing surface for interference fit with the filter seat sealing surface of the solenoid valve filter seat. The filter seat sealing surface protrudes from the outer periphery of the filter seat, and the axial length of the filter seat sealing surface is less than the axial length of the filter seat. The ejection mechanism includes an axially movable support component and a drive component. The support component is configured to support the bottom filter screen of the solenoid valve during testing and to move axially after testing by the drive component to overcome the interference fit force between the solenoid valve and the mounting cavity and eject the solenoid valve.

[0006] In the above technical solution, the solenoid valve testing fixture also includes: The base is detachably connected to the mounting block, and a receiving cavity is defined between the base and the mounting block; The support component is axially movable within the accommodating cavity via a limiting structure, which restricts the axial movement range of the support component.

[0007] In the above technical solution, the limiting structure includes a limiting part disposed on the supporting component; in When the supporting component is driven to move axially upward by the driving component, the top surface of the accommodating cavity is used to limit the upper end surface of the limiting part; When the supporting component is driven to move axially downward, the bottom surface of the accommodating cavity is used to limit the lower end surface of the limiting part.

[0008] In the above technical solution, the limiting part includes an annular step formed on the outer periphery of the supporting component; The bottom of the mounting block has a first stepped hole with an opening facing downwards, and the top of the base has a second countersunk hole with an opening facing upwards. The first stepped hole and the second countersunk hole fit together to define the receiving cavity. in: When the support component is driven to move axially upward by the drive component, the annular step on the outer periphery of the support component can be limited by the first step hole; When the support component is driven to move axially downward by the drive component, the annular step on the outer periphery of the support component can be limited by the second countersunk hole.

[0009] In the above technical solution, the mounting block is also provided with a second step hole that communicates with the upper side of the first step hole, and the upper small diameter section of the support component is inserted into the second step hole and fitted with it with a clearance. The outer periphery of the small-diameter section at the upper end of the support component is provided with a sealing ring groove, and a second O-ring is installed in the sealing ring groove. The second O-ring is in sealing contact with the hole wall of the second stepped hole.

[0010] In the above technical solution, the bottom of the mounting block is provided with a downwardly protruding first boss, and the top of the base is provided with an upwardly opening first countersunk hole; The first boss is embedded in the first countersunk hole to achieve positioning.

[0011] In the above technical solution, the driving component includes: A connecting rod, which is hinged to the base and has a push surface; The handle, which is connected to the connecting rod, is used to drive the connecting rod to rotate so that the push surface pushes the support component to move axially.

[0012] In the above technical solution, the side wall of the base is provided with a transverse through-hole, and the connecting rod is provided with a pin hole. The hole and the pin hole are arranged coaxially and are hinged by a cylindrical pin.

[0013] In the above technical solution, the mounting block is also provided with a first O-ring for contacting the valve body flange surface of the solenoid valve. The first O-ring and the sealing surface together form a composite sealing structure.

[0014] In the above technical solution, the support component is provided with an oil passage, which connects the oil inlet of the mounting block and the oil inlet of the solenoid valve to provide hydraulic medium during testing.

[0015] In the above technical solution, the solenoid valve testing fixture also includes: A pressure plate, detachably connected to the mounting block, is used to axially press the valve body of the solenoid valve during testing.

[0016] In the above technical solution, when the solenoid valve is assembled with the solenoid valve, the lower end face of the pressure plate of the solenoid valve test fixture can abut against the upper end face of the valve body flange of the solenoid valve to axially press the solenoid valve and make the interference fit between the filter screen seat and the sealing surface in place.

[0017] In the above technical solution, the bottom of the pressure plate is provided with a second boss with an outer cylindrical surface, and the top of the mounting block is provided with a first inner hole that mates with the second boss. The outer cylindrical surface of the second boss forms a clearance fit with the first inner hole of the mounting block to allow the pressure plate to automatically align itself when under pressure.

[0018] In the above technical solution, the mounting block has a first inner hole, a second inner hole, and a third inner hole arranged sequentially and coaxially along the axial direction. The bottom end face of the third inner hole forms an annular sealing seat for placing the first O-ring seal. The diameter of the second inner hole is larger than that of the third inner hole, and a first step surface is formed between the two. The first step surface constitutes an axial positioning surface for abutting against the valve body flange surface of the solenoid valve. The diameter of the first inner hole is larger than that of the second inner hole, and a second step surface is formed between the two. The lower end of the mounting block is provided with a first step hole and a second step hole located at the top of the first step hole with a smaller diameter. The second step hole communicates with the mounting cavity. The bottom of the mounting block has a first boss protruding downwards. The first boss is used to cooperate with the first countersunk hole at the top of the base for positioning. The mounting block is also provided with a radially penetrating oil inlet and oil outlet. The oil inlet communicates with the second step hole, and the oil outlet communicates with the second inner hole. The base has a first countersunk hole that mates with the boss and a second countersunk hole located at the bottom of the first countersunk hole and having a larger diameter. The second countersunk hole is used to accommodate the lower section of the support component. The side wall of the base has a transverse through-hole. Support components include: The support shaft is in the shape of a stepped shaft. The support shaft includes an upper small diameter section, which is inserted into the second stepped hole and forms a clearance fit with it. A sealing groove is formed on the outer periphery of the upper small-diameter section to accommodate the second O-ring seal so as to achieve a seal with the hole wall of the second stepped hole; A spherical surface is formed on the lower end face of the support shaft for point contact with the drive components; The circular step, located in the middle section of the support shaft, has an outer diameter larger than the diameter of the second step hole and smaller than the diameter of the second countersunk hole, in order to limit the maximum upward displacement of the support shaft. The support surface, formed on the upper end face of the circular step, is used to contact the end face of the bottom filter support rib of the solenoid valve. The thrust surface is formed on the upper end face of the support shaft and is used to directly push the lower end face of the bottom filter screen. The oil passage extends downward from the thrust surface and radially through to the top of the sealing ring groove to connect the oil inlet and the solenoid valve oil inlet; The pressure plate has a second boss with an outer cylindrical surface protruding downward from the bottom. The outer cylindrical surface of the second boss forms a clearance fit with the inner surface of the first inner hole. The lower end face of the second boss is used to abut against the upper end face of the valve body flange of the solenoid valve. The pressure plate is also provided with a second central through hole that penetrates the second boss. The central through hole is used for the upper section of the valve body of the solenoid valve to pass through. The drive components include: The connecting rod has a pin hole, a push surface, and a socket. The pin hole is coaxial with the round hole of the base and forms a hinge through a cylindrical pin. The push surface forms a cam pair or point contact with the spherical surface of the support shaft. The socket is used to form a detachable connection with the cylindrical boss of the handle. The handle has a cylindrical boss at one end, which is used to insert the connecting rod into the socket to apply rotational torque. The first O-ring is compressed between the valve body flange face of the solenoid valve and the bottom face of the third inner hole, the second O-ring is compressed between the sealing groove of the support shaft and the wall of the second stepped hole, and the axial gap between the annular step and the bottom of the second countersunk hole constitutes the ejection stroke of the support shaft.

[0019] The second aspect of this application also provides a system for testing the performance of a solenoid valve, which includes a solenoid valve and the solenoid valve test fixture provided in the first aspect of this application, wherein the solenoid valve (10) is detachably installed in the test fixture.

[0020] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: The solenoid valve testing fixture in this embodiment is equipped with a sealing surface that can be interference-fitted with the solenoid valve, changing the line contact seal to a surface contact seal, significantly increasing the effective pressure-bearing area, effectively reducing the leakage rate, and the ejection mechanism, which includes support components and drive components, changes the "riveting → knocking" to "axial pushing", significantly shortening the single disassembly and assembly time and effectively reducing the testing cost. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the solenoid valve testing fixture used in this application embodiment when testing the sealing performance of the solenoid valve; Figure 2 This is a cross-sectional view of the solenoid valve in an embodiment of this application; Figure 3 This is a cross-sectional view of the mounting block in an embodiment of this application; Figure 4 This is a three-dimensional structural schematic diagram of the supporting component in an embodiment of this application; Figure 5 This is a three-dimensional structural diagram of the connecting rod in an embodiment of this application; Figure 6 This is a cross-sectional view of the base in an embodiment of this application.

[0022] in: 1-Pressure plate; 2-Mounting block, 21-Oil inlet, 22-Oil outlet, 23-First inner hole, 24-Second inner hole, 25-Third inner hole, 26-Sealing surface, 27-Second step hole, 28-First step hole, 29-First boss; 3-Second O-ring seal; 4-Base, 41-First countersunk hole, 42-Second countersunk hole, 43-Round hole; 5-Support component, 51-Sealing ring groove, 52-Spherical surface, 53-Annular step, 54-Support surface, 55-Thrust surface, 56-Oil passage; 6-First O-ring seal; 7-Cylindrical pin; 8-Connecting rod, 81-Pin hole, 82-Push surface, 83-Insertion hole; 9-Handle; 10-Solenoid valve; 101-Valve body, 1011-Upper end face of valve body flange, 1012-Side wall of valve body flange, 1013-Flange body flange face; 102 - Filter holder, 1021 - Filter holder sealing surface; 103-Bottom filter screen, 1031-Lower end face of bottom filter screen, 1032-Bottom filter screen support rib. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] Throughout the specification and claims, the following terms will have at least the meaning explicitly associated herein, unless the context otherwise requires. The meanings defined below are not intended to limit the terms, but are merely illustrative examples.

[0025] In the description of this utility model, the phrase "in one embodiment" does not necessarily refer to the same embodiment, although it may refer to the same embodiment. Similarly, the phrase "in some embodiments" as used herein, when used multiple times, does not necessarily refer to the same embodiment, although it may refer to the same embodiment. As used herein, the term "or" is an inclusive "or" operator and is equivalent to the term "and / or" unless the context clearly specifies otherwise. The term "based on" is not exclusive and allows for reliance on additional factors not described, unless the context clearly specifies otherwise. The word "exemplary" herein means "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. The scope of this utility model is limited only by the scope of the appended claims, and any examples set forth in this specification are not intended to be limiting, but merely to illustrate some of the many possible embodiments of the claimed utility model. The various embodiments provided by this utility model should not be construed as limiting the scope of protection of this utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Based on this, such as Figures 1-6 As shown, the first aspect of this application provides a solenoid valve testing fixture, including: Mounting block 2 has a mounting cavity for accommodating solenoid valve 10. The mounting cavity contains a sealing surface 26 for interference fit with the filter seat sealing surface 1021 of the solenoid valve filter seat 102. The filter seat sealing surface 1021 protrudes from the outer periphery of the filter seat 102, and the axial length of the filter seat sealing surface 1021 is less than the axial length of the filter seat 102. Preferably, as shown... Figure 2 As shown, the axial length of the filter seat sealing surface 1021 is less than or equal to 1.3mm, that is, the effective length of the sealing surface between the filter seat 102 of the solenoid valve and the installation cavity of the test fixture is less than or equal to 1.3mm, and its effective sealing length is extremely short. The ejection mechanism includes an axially movable support member 5 and a drive member. The support member 5 is configured to support the bottom filter screen 103 of the solenoid valve during testing and to move axially after testing by the drive member in order to overcome the interference fit between the solenoid valve 10 and the mounting cavity and eject the solenoid valve 10.

[0031] The solenoid valve testing fixture in this embodiment is equipped with a sealing surface that can be interference-fitted with the solenoid valve, changing the line contact seal to a surface contact seal, significantly increasing the effective pressure-bearing area, effectively reducing the leakage rate, and the ejection mechanism, which includes support components and drive components, changes the "riveting → knocking" to "axial pushing", significantly shortening the single disassembly and assembly time and effectively reducing the testing cost.

[0032] Furthermore, in some possible implementations, the solenoid valve test fixture also includes: The base 4 is detachably connected to the mounting block 2, and a receiving cavity is defined between the base 4 and the mounting block 2. The support component 5 is axially movable within the accommodating cavity via a limiting structure, which restricts the axial movement range of the support component 5.

[0033] In this embodiment, the free ejection is transformed into controlled ejection through a "receiving cavity + limiting structure," which achieves rapid assembly and disassembly while ensuring the long-term reliability of the high-pressure sealing surface.

[0034] Furthermore, in some possible implementations, the limiting structure includes a limiting portion disposed on the support member 5; in When the supporting component 5 is driven to move axially upward by the driving component, the top surface of the accommodating cavity is used to limit the upper end surface of the limiting part. When the supporting component 5 is driven to move axially downward, the bottom surface of the accommodating cavity is used to limit the lower end surface of the limiting part.

[0035] In this embodiment, the limiting part makes hard contact with the top / bottom of the cavity, locking the axial travel of the support component 5 within the theoretical design value of ±0.1 mm, thus completely eliminating the risk of overshoot.

[0036] Furthermore, in some possible implementations, the limiting portion includes an annular step 53 formed on the outer periphery of the support member 5; The bottom of the mounting block 2 has a first stepped hole 28 with an opening facing downwards, and the top of the base 4 has a second countersunk hole 42 with an opening facing upwards. The first stepped hole 28 and the second countersunk hole 42 fit together to define the receiving cavity. in: When the support component 5 is driven to move axially upward by the drive component, the annular step 53 on the outer periphery of the support component can be limited by the first step hole 28. When the support component 5 is driven to move axially downward by the drive component, the annular step 53 on the outer periphery of the support component can be limited by the second countersunk hole 42.

[0037] In this embodiment, the three functions of limiting, guiding, and positioning are integrated into one by using "circular step + double step hole". Under the premise of zero additional parts, the comprehensive effect of high-precision guidance + double-sided hard limiting + modular assembly is achieved.

[0038] Furthermore, in some possible embodiments, the mounting block 2 is also provided with a second step hole 27 communicating with the upper side of the first step hole 28, and the upper small diameter section of the support member 5 is inserted into the second step hole 27 and fitted with it with a clearance. Among them, the outer periphery of the small diameter section at the upper end of the support component 5 is provided with a sealing ring groove 51, and a second O-ring 3 is installed in the sealing ring groove 51. The second O-ring 3 is in sealing contact with the hole wall of the second stepped hole 27.

[0039] In this embodiment, the "second step hole + second O-ring" provides a second zero-leakage defense for high-pressure testing without adding any parts, while also achieving integrated guidance and sealing functions.

[0040] Furthermore, in some possible implementations, the bottom of the mounting block 2 is provided with a downwardly protruding first boss 29, and the top of the base 4 is provided with an upwardly opening first countersunk hole 41. The first protrusion 29 is embedded in the first countersunk hole 41 to achieve positioning.

[0041] In this embodiment, the positioning, anti-rotation, and repeatability accuracy functions are integrated into one machining feature by setting up a "boss + countersunk hole", which realizes modular quick assembly and disassembly with zero auxiliary positioning parts.

[0042] Furthermore, in some possible implementations, the drive component includes: Link 8 is hinged to base 4 and has a push surface 82; Handle 9, which is connected to link 8, is used to drive link 8 to rotate so that push surface 82 pushes support component 5 to move axially.

[0043] In this embodiment of the application, by changing the "ejection operation" from tool-dependent to lever-handle single-hand operation, significant improvements are achieved in three aspects: labor saving, no damage, and quick replacement.

[0044] Furthermore, in some possible embodiments, the side wall of the base 4 is provided with a transverse through-hole 43, and the connecting rod 8 is provided with a pin hole 81. The through-hole 43 and the pin hole 81 are arranged coaxially and are hinged together by a cylindrical pin 7.

[0045] In this embodiment, the three functions of hinge, positioning, and quick release are integrated into a standard part using a "round hole-pin hole-cylindrical pin" to achieve high coaxiality, high load-bearing capacity, and tool-free maintenance.

[0046] Furthermore, in some possible embodiments, the mounting block 2 is also provided with a first O-ring 6 for contacting the valve body flange face 1013 of the solenoid valve, and the first O-ring 6 and the sealing surface 26 together form a composite sealing structure.

[0047] In this embodiment, a composite seal combining rigidity and flexibility is formed by "first O-ring seal + interference sealing surface", which significantly improves performance in three aspects: high pressure zero leakage, dimensional tolerance, and simplified assembly.

[0048] Furthermore, in some possible embodiments, the support component 5 is provided with an oil passage 56, which connects the oil inlet 21 of the mounting block 2 with the oil inlet of the solenoid valve to provide hydraulic medium during testing.

[0049] In this embodiment, the high-pressure zero external leakage, minimal dead space, and compact structure are achieved by "built-in oil passages" in the support component, which significantly improves test reliability and production line compatibility.

[0050] Furthermore, in some possible implementations, the solenoid valve test fixture also includes: Pressure plate 1 is detachably connected to mounting block 2 and is used to axially press the valve body 101 of the solenoid valve during testing.

[0051] In this embodiment, the three functions of pressing, positioning, and quick release are integrated into one by using a "pressure plate + detachable connection", which significantly improves pressing efficiency, surface protection, and production line cycle time.

[0052] Furthermore, in some possible embodiments, when the solenoid valve testing fixture is in the assembled state with the solenoid valve, the lower end face of the pressure plate 1 can abut against the upper end face 1011 of the valve body flange of the solenoid valve to axially press the solenoid valve 10 and make the interference fit between the filter screen seat 102 and the sealing surface 26 in place.

[0053] In this embodiment, by using an "end-to-end" clamping path, the interference fit rate, pressing cycle, and surface quality are simultaneously improved, providing a reliable guarantee for high-pressure sealing.

[0054] Furthermore, in some possible embodiments, the bottom of the pressure plate 1 is provided with a second boss having an outer cylindrical surface, and the top of the mounting block 2 is provided with a first inner hole 23 that mates with the second boss. The outer cylindrical surface of the second boss forms a clearance fit with the first inner hole 23 of the mounting block 2, so that the pressure plate 1 can automatically align itself when under pressure.

[0055] In the embodiments of this application, the "boss-inner hole clearance fit" integrates the three functions of self-alignment, guidance, and clamping into a pair of machining features, which significantly improves sealing reliability, surface quality, and automation cycle time.

[0056] Furthermore, in some possible embodiments, the mounting block 2 has a first inner hole 23, a second inner hole 24, and a third inner hole 25 arranged sequentially and coaxially along the axial direction. The bottom end face of the third inner hole 25 forms an annular sealing seat for placing the first O-ring 6. The diameter of the second inner hole 24 is larger than that of the third inner hole 25, and a first stepped surface is formed between them. The first stepped surface constitutes an axial positioning surface for abutting against the valve body flange face 1013 of the solenoid valve. The diameter of the first inner hole 23 is larger than that of the second inner hole 24, and the second inner hole 25 is coaxially arranged along the axial direction. A second stepped surface is formed between the two. The lower end of the mounting block 2 is provided with a first stepped hole 28 and a second stepped hole 27 located at the top of the first stepped hole 28 and with a smaller diameter. The second stepped hole 27 is connected to the mounting cavity. The bottom of the mounting block 2 is provided with a first boss 29 protruding downward. The first boss 29 is used to cooperate with the first countersunk hole 41 at the top of the base 4 for positioning. The mounting block 2 is also provided with a radially penetrating oil inlet 21 and an oil outlet 22. The oil inlet 21 is connected to the second stepped hole 27, and the oil outlet 22 is connected to the second inner hole 24. The base 4 has a first countersunk hole 41 that mates with the boss 29 and a second countersunk hole 42 located at the bottom of the first countersunk hole 41 and having a larger diameter. The second countersunk hole 42 is used to accommodate the lower section of the support member 5. The side wall of the base 4 is provided with a transverse through circular hole 43. Support component 5 includes: The support shaft is in the shape of a stepped shaft. The support shaft includes an upper small diameter section, which is inserted into the second stepped hole 27 and forms a clearance fit with it. The sealing groove 51 is opened on the outer periphery of the upper small diameter section to accommodate the second O-ring 3 so as to achieve sealing with the hole wall of the second stepped hole 27. Spherical surface 52 is formed on the lower end face of the support shaft and is used for point contact with the drive component; The circular step 53 is located in the middle section of the support shaft. Its outer diameter is larger than the diameter of the second step hole 27 and smaller than the diameter of the second countersunk hole 42, so as to limit the maximum upward displacement of the support shaft. The support surface 54 is formed on the upper end face of the annular step 53 and is used to contact the end face of the bottom filter support rib 1032 of the solenoid valve. The thrust surface 55 is formed on the upper end face of the support shaft and is used to directly push the lower end face 1031 of the bottom filter screen. Oil passage 56 extends downward from thrust surface 55 and radially through to above sealing ring groove 51 to connect oil inlet 21 with solenoid valve oil inlet; The pressure plate 1 has a second boss with an outer cylindrical surface protruding downward at the bottom. The outer cylindrical surface of the second boss forms a clearance fit with the inner surface of the first inner hole 23. The lower end face of the second boss is used to abut against the upper end face 1011 of the valve body flange of the solenoid valve. The pressure plate 1 is also provided with a second central through hole that penetrates the second boss. The central through hole is used for the upper section of the valve body of the solenoid valve 10 to pass through. The drive components include: Link 8 has a pin hole 81, a push surface 82 and a insertion hole 83. The pin hole 81 is coaxial with the round hole 43 of the base 4 and is hinged through the cylindrical pin 7. The push surface 82 forms a cam pair or point contact with the spherical surface 52 of the support member 5. The insertion hole 83 is used to form a detachable insertion with the cylindrical boss of the handle 9. Handle 9, one end of the handle is provided with a cylindrical boss, the cylindrical boss is used to insert into the insertion hole 83 of the connecting rod 8 to apply rotational torque; The first O-ring 6 is compressed between the valve body flange face 1013 of the solenoid valve and the bottom end face of the third inner hole 25, the second O-ring 3 is compressed between the sealing ring groove 51 of the support shaft and the hole wall of the second stepped hole 27, and the axial gap between the annular step 53 and the bottom of the second countersunk hole 42 constitutes the ejection stroke of the support component 5.

[0057] In this embodiment of the application, by integrating "multi-stage coaxial sleeve + double O-ring + boss quick-release + built-in oil passage + lever ejection" into a single mounting block and a single base, a solenoid valve test fixture with zero leakage, zero tool quick-change, and zero maintenance is achieved, effectively reducing the number of parts and manufacturing cost of the solenoid valve test fixture.

[0058] In layman's terms, such as Figures 1-6 As shown, the testing fixture for the solenoid valve in this embodiment mainly includes three main components: mounting block 2, pressure plate 1, and base 4. The first O-ring 6 is placed on the end face of the third inner hole 25 at the upper end of the mounting block 2. The end face of the second inner hole 24 at the upper end of the mounting block 2 contacts and compresses the first O-ring 6 with the valve body flange face 1013 of the solenoid valve. The filter seat sealing surface 1021 of the solenoid valve and the sealing surface 26 of the mounting block are fitted together. In order to achieve the sealing function, this fit is an interference fit.

[0059] The outer cylinder at the lower end of the pressure plate 1 extends into the first inner hole 23 at the upper end of the mounting block. The solenoid valve can pass through the middle through hole of the pressure plate 1, and the lower end face of the pressure plate 1 is in close contact with the upper end face 1011 of the valve body flange of the solenoid valve.

[0060] The first protrusion 29 of mounting block 2 engages with the first countersunk hole 41 on base 4.

[0061] The upper end of the support shaft is inserted into the second stepped hole 27 at the lower end of the mounting block 2; the support shaft is provided with a sealing ring groove, and the second O-ring 3 is installed in the sealing ring groove and forms a seal with the second stepped hole 27 at the lower end of the mounting block 2. The support shaft is provided with a support surface 54, which contacts the end face of the bottom filter support rib 1032 of the solenoid valve.

[0062] The support shaft has a circular step in the middle, and the support shaft can move between the countersunk hole at the lower end of the mounting block 2 and the second countersunk hole 42 of the base.

[0063] The base 4 has a round hole 43, and the connecting rod 8 has a pin hole 81. The round hole 43 and the pin hole 81 are arranged coaxially and a cylindrical pin 7 passes through them.

[0064] One end of the connecting rod 8 has a push surface 82, which contacts the spherical surface 52 of the support shaft; one end of the connecting rod 8 is provided with a socket 83, which is connected to a cylindrical boss on the handle 9.

[0065] The support shaft is also provided with an oil passage 56. The oil inlet 21 of the mounting block 2 is connected to the oil inlet of the solenoid valve through the oil passage 56 provided on the support shaft. The mounting block 2 is provided with an oil outlet 22, which is connected to the oil outlet of the solenoid valve 10.

[0066] Furthermore, the second aspect of this application also provides a system for testing the performance of a solenoid valve, which includes a solenoid valve 10 and the solenoid valve testing fixture provided in the first aspect of this application, wherein the solenoid valve (10) is detachably installed in the testing fixture.

[0067] Furthermore, a third aspect of this application also provides a method for using a solenoid valve testing fixture, wherein the method includes the following steps: First, put the second O-ring 3 on the support shaft and place the support shaft on the base 4; The second step is to install the mounting block 2 onto the base 4 and insert the first O-ring 6 into the third inner hole 25 at the upper end of the mounting block 2. The third step is to insert the cylindrical pin 7 into the round hole of the base 4 and the pin hole 81 of the connecting rod 8; Fourth step, place the solenoid valve 10 into the mounting block 2 so that the valve body flange side wall 1012 of the solenoid valve 10 contacts the second inner hole 24 of the mounting block 2. Fifth step, install the pressure plate 1 onto the mounting block 2; The sixth step is to place the assembled fixture into the pressure device, which applies a certain pressure to the upper surface of the pressure plate 1, so that the sealing surface 1021 of the filter seat of the solenoid valve 10 and the sealing surface 26 of the mounting block 2 are interference-fitted; in addition, the end face of the bottom filter support rib 1032 of the solenoid valve 10 has a certain pressure with the support surface 54 of the support shaft, so as to ensure that the end filter will not be washed away during the test. Step 6: Connect the oil inlet 21 and oil outlet 22 of mounting block 2 to the oil inlet and outlet of the test equipment, respectively. Step 7: Place the coil on the solenoid valve 10 and begin the hydraulic performance test according to the test requirements.

[0068] Step 8: After the test is completed, the steps to remove solenoid valve 10 are as follows: Step 9: Remove the pressure applied in step 6 and remove the coil and pressure plate 1; Step 10: Insert the cylindrical boss on handle 9 into the insertion hole 83 of connecting rod 8. The operator applies downward pressure to handle 9, causing connecting rod 8 to rotate. This causes the pushing surface 82 of connecting rod 8 to press against the spherical surface 52 of support member 5, resulting in an upward pushing force on support member 5. Consequently, support member 5 moves upward, bringing its pushing surface 55 into contact with the lower end face 1031 of the bottom filter screen of solenoid valve 10. In this way, solenoid valve 10 can be pushed out.

[0069] Reinstall a new solenoid valve 10, starting from steps four through seven, and then begin testing.

[0070] In the above embodiments of this application, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. The steps illustrated in the related flowcharts can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be performed in a different order than that shown here. In other words, the order of steps described in the foregoing embodiments is merely an example. Reasonable adjustments to the order of steps based on the content of the embodiments of this application are also within the protection scope of the embodiments of this application.

[0071] The sequence numbers or order of description of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A solenoid valve testing fixture, characterized in that, include: Mounting block (2) has a mounting cavity for accommodating solenoid valve (10), wherein the mounting cavity is provided with a sealing surface (26) for interference fit with the filter seat sealing surface (1021) of the solenoid valve filter seat (102), the filter seat sealing surface (1021) protruding from the outer periphery of the filter seat (102), and the axial length of the filter seat sealing surface (1021) is less than the axial length of the filter seat (102); The ejection mechanism includes an axially movable support member (5) and a drive member. The support member (5) is configured to support the bottom filter screen (103) of the solenoid valve during testing and to move axially after testing by the drive member in order to overcome the interference fit between the solenoid valve (10) and the mounting cavity and eject the solenoid valve (10).

2. The solenoid valve testing fixture according to claim 1, characterized in that, The solenoid valve testing fixture also includes: The base (4) is detachably connected to the mounting block (2), and a receiving cavity is defined between the base (4) and the mounting block (2); The support component (5) is axially movable within the accommodating cavity via a limiting structure, which is used to limit the axial movement range of the support component (5).

3. The solenoid valve testing fixture according to claim 2, characterized in that, The limiting structure includes a limiting part disposed on the supporting component (5); in When the supporting member (5) is driven to move axially upward by the driving member, the top surface of the accommodating cavity is used to limit the upper end surface of the limiting part; When the supporting member (5) is driven to move axially downward by the driving member, the bottom surface of the accommodating cavity is used to limit the lower end surface of the limiting part.

4. The solenoid valve testing fixture according to claim 3, characterized in that, The limiting part includes an annular step (53) formed on the outer periphery of the support member (5); The bottom of the mounting block (2) has a first stepped hole (28) opening downwards, and the top of the base (4) has a second countersunk hole (42) opening upwards. The first stepped hole (28) and the second countersunk hole (42) cooperate to define the accommodating cavity. in: When the support member (5) is driven to move axially upward by the driving member, the annular step (53) on the outer periphery of the support member can be limited by the first step hole (28); When the support member (5) is driven to move axially downward by the driving member, the annular step (53) on the outer periphery of the support member can be limited by the second countersunk hole (42).

5. The solenoid valve testing fixture according to claim 4, characterized in that, The mounting block (2) is also provided with a second step hole (27) communicating with the upper side of the first step hole (28), and the upper small diameter section of the support member (5) is inserted into the second step hole (27) and fitted with it with a clearance; Among them, the outer periphery of the small diameter section at the upper end of the support component (5) is provided with a sealing ring groove (51), and a second O-ring (3) is installed in the sealing ring groove (51). The second O-ring (3) is in sealing contact with the hole wall of the second stepped hole (27).

6. The solenoid valve testing fixture according to claim 4, characterized in that, The bottom of the mounting block (2) is provided with a downward protruding first boss (29), and the top of the base (4) is provided with an upward-opening first countersunk hole (41). The first boss (29) is embedded in the first countersunk hole (41) for positioning.

7. The solenoid valve testing fixture according to any one of claims 2-4, characterized in that, The driving component includes: Link (8), which is hinged to the base (4) and has a push surface (82); A handle (9) is connected to the connecting rod (8) and is used to drive the connecting rod (8) to rotate so that the push surface (82) pushes the support member (5) to move axially.

8. The solenoid valve testing fixture according to claim 7, characterized in that, The side wall of the base (4) is provided with a transverse through hole (43), and the connecting rod (8) is provided with a pin hole (81). The hole (43) and the pin hole (81) are arranged coaxially and are hinged by a cylindrical pin (7).

9. The solenoid valve testing fixture according to any one of claims 1-4, characterized in that, The mounting block (2) is also provided with a first O-ring (6) for contacting the valve body flange surface (1013) of the solenoid valve. The first O-ring (6) and the sealing surface (26) together form a composite sealing structure.

10. The solenoid valve testing fixture according to any one of claims 1-4, characterized in that, The support component (5) is provided with an oil passage (56), which connects the oil inlet (21) of the mounting block (2) with the oil inlet of the solenoid valve to provide hydraulic medium during testing.

11. The solenoid valve testing fixture according to any one of claims 1-4, characterized in that, The solenoid valve testing fixture also includes: Pressure plate (1), which is detachably connected to mounting block (2), is used to axially press the valve body (101) of the solenoid valve during testing.

12. The solenoid valve testing fixture according to claim 11, characterized in that, When the solenoid valve is assembled, the lower end face of the pressure plate (1) of the solenoid valve test fixture can abut against the upper end face (1011) of the valve body flange of the solenoid valve to axially press the solenoid valve (10) and make the interference fit between the filter screen seat (102) and the sealing surface (26) in place.

13. The solenoid valve testing fixture according to claim 12, characterized in that, The bottom of the pressure plate (1) is provided with a second boss with an outer cylindrical surface protruding downwards, and the top of the mounting block (2) is provided with a first inner hole (23) that mates with the second boss. The outer cylindrical surface of the second boss forms a clearance fit with the first inner hole (23) of the mounting block (2) to allow the pressure plate (1) to automatically align when under pressure.

14. The solenoid valve testing fixture according to claim 1, characterized in that, The mounting block (2) has a first inner hole (23), a second inner hole (24), and a third inner hole (25) arranged axially and coaxially. The bottom end face of the third inner hole (25) forms an annular sealing seat for placing a first O-ring (6). The diameter of the second inner hole (24) is larger than that of the third inner hole (25), and a first stepped surface is formed between them. The first stepped surface constitutes an axial positioning surface for abutting against the valve body flange face (1013) of the solenoid valve. The diameter of the first inner hole (23) is larger than that of the second inner hole (24), and a second stepped surface is formed between them. The lower end is provided with a first stepped hole (28) and a second stepped hole (27) located at the top of the first stepped hole (28) and with a smaller diameter. The second stepped hole (27) is connected to the mounting cavity. The bottom of the mounting block (2) is provided with a first boss (29) protruding downward. The first boss (29) is used to cooperate with the first countersunk hole (41) at the top of the base (4) for positioning. The mounting block (2) is also provided with a radially penetrating oil inlet (21) and an oil outlet (22). The oil inlet (21) is connected to the second stepped hole (27), and the oil outlet (22) is connected to the second inner hole (24). The base (4) has a first countersunk hole (41) that mates with the boss (29) and a second countersunk hole (42) located at the bottom of the first countersunk hole (41) and having a larger diameter. The second countersunk hole (42) is used to accommodate the lower section of the support member (5). The side wall of the base (4) is provided with a transverse through hole (43). The support component (5) includes: The support shaft is in the shape of a stepped shaft. The support shaft includes an upper small diameter section, which is inserted into the second stepped hole (27) and forms a clearance fit with it. A sealing groove (51) is provided on the outer periphery of the upper small diameter section to accommodate the second O-ring (3) to achieve a seal with the hole wall of the second stepped hole (27); A spherical surface (52) is formed on the lower end face of the support shaft for point contact with the drive component; A circular step (53) is located in the middle section of the support shaft. Its outer diameter is larger than the diameter of the second step hole (27) and smaller than the diameter of the second countersunk hole (42) to limit the maximum upward displacement of the support shaft. The support surface (54) is formed on the upper end face of the annular step (53) and is used to contact the end face of the bottom filter support rib (1032) of the solenoid valve; The thrust surface (55) is formed on the upper end face of the support shaft and is used to directly push the lower end face (1031) of the bottom filter screen. The oil passage (56) extends downward from the thrust surface (55) and radially through to the top of the sealing ring groove (51) to connect the oil inlet (21) and the solenoid valve oil inlet; The pressure plate (1) has a second boss with an outer cylindrical surface protruding downward at the bottom. The outer cylindrical surface of the second boss forms a clearance fit with the inner surface of the first inner hole (23). The lower end face of the second boss is used to abut against the upper end face (1011) of the valve body flange of the solenoid valve. The pressure plate (1) is also provided with a second central through hole that penetrates the second boss. The central through hole is used for the upper section of the valve body of the solenoid valve (10) to pass through. The driving component includes: The connecting rod (8) has a pin hole (81), a push surface (82) and a socket (83). The pin hole (81) is coaxial with the round hole (43) of the base (4) and is hinged by a cylindrical pin (7). The push surface (82) forms a cam pair or point contact with the spherical surface (52) of the support member (5). The socket (83) is used to form a detachable connection with the cylindrical boss of the handle (9). Handle (9), one end of which is provided with a cylindrical boss, which is used to insert into the insertion hole (83) of the connecting rod (8) to apply rotational torque; The first O-ring (6) is compressed between the valve body flange face (1013) of the solenoid valve and the bottom end face of the third inner hole (25), the second O-ring (3) is compressed between the sealing ring groove (51) of the support shaft and the hole wall of the second stepped hole (27), and the axial gap between the annular step (53) and the bottom of the second countersunk hole (42) constitutes the ejection stroke of the support component (5).

15. A system for testing the performance of a solenoid valve, characterized in that, The device includes a solenoid valve (10) and a solenoid valve test fixture according to any one of claims 1-14, wherein the solenoid valve (10) is detachably installed in the test fixture.

Images