A static load test bench pressure head tooling

Abstract

This utility model provides a static load test bench indenter fixture, belonging to the field of rail vehicle technology. It includes a pressure plate, a conical sleeve, multiple positioning seats, multiple positioning plates, and multiple locking fasteners. The pressure plate has mounting holes, and the conical sleeve is fitted into these holes with its lower end face flush with the lower end face of the pressure plate. The conical sleeve has a concave cavity and a protrusion. The positioning seats are fixedly mounted on the pressure plate. Multiple positioning seats are arranged in a ring around the mounting holes. The positioning plates are detachably connected to the positioning seats. The positioning plates are horizontally arranged, with one end located between the positioning seat and the mounting hole. The lower end face of the positioning plate and the upper end face of the pressure plate form an installation gap for accommodating the indenter. Locking fasteners are installed on the corresponding positioning seats and positioning plates. The static load test bench indenter fixture provided by this utility model effectively prevents the middle part of the air spring from being lifted and deformed, ensuring the integrity of the air spring components.

Description

Technical Field

[0001] This utility model belongs to the field of rail vehicle technology, and more specifically, it relates to a static load test bench pressure head tooling. Background Technology

[0002] In the rail vehicle manufacturing and maintenance system, the bogie, as the core load-bearing component connecting the car body and the wheel-rail system, directly determines the vehicle's driving safety and ride comfort through its structural strength and load transfer stability. The bogie static load test bench, as the core equipment for this test, functions by applying controllable vertical loads to key load-bearing points of the bogie through a graded loading system, while simultaneously collecting data such as load, displacement, and stress through a sensing system. In the bogie suspension system test, the air spring, as the core elastic element, has its load transfer characteristics at the connection interface with the bogie frame and car body being a key focus of the test.

[0003] The loading of air springs is typically achieved through a dedicated indenter assembly—one end of the indenter is connected to the hydraulic loading cylinder of the test bench, and the other end directly contacts the upper cover plate of the air spring, transferring the vertical load output by the cylinder to the air spring. During repeated loading tests on the bogie, a pressure difference exists on both sides of the indenter, and the middle part of the indenter structure on the test bench is a movable spring structure. Therefore, when the indenter descends, the surface of the upper cover plate of the air spring experiences uneven force, causing the middle part of the air spring to be lifted, resulting in deformation of the upper cover plate. Utility Model Content

[0004] The purpose of this utility model is to provide a static load test bench pressure head fixture to solve the technical problem in the prior art where uneven force on the surface of the air spring's upper cover plate during static load testing leads to deformation of the upper cover plate.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a static load test bench indenter fixture, comprising: The pressure plate has a through mounting hole; the pressure plate is used to act on the air spring from top to bottom; A tapered sleeve is fitted onto the mounting hole and connected to the pressure plate; the lower end face of the tapered sleeve is flush with the lower end face of the pressure plate; the lower end of the tapered sleeve is provided with a cavity for accommodating the air spring boss, and the upper end is provided with a protrusion that fits into the center hole of the pressure head. Multiple positioning seats are fixedly installed on the pressure plate; the multiple positioning seats are arranged in a ring around the mounting hole; Multiple positioning plates are detachably connected to the positioning seat; the positioning plates are arranged horizontally, with one end located between the positioning seat and the mounting hole, and an installation gap is formed between the lower end face of the positioning plate and the upper end face of the pressure plate; Multiple locking components are installed on the corresponding positioning bases and positioning plates, respectively.

[0006] In one possible implementation, the positioning base has horizontal and vertical through holes arranged in a cross pattern, the positioning plate has a connecting hole corresponding to the vertical through hole, the positioning plate slides into the horizontal through hole, and the locking fastener is a pin that passes through the vertical through hole and the connecting hole from top to bottom.

[0007] In one possible implementation, the transverse through hole is a rectangular hole, the positioning plate is a square plate that mates with the rectangular hole, and one end of the positioning plate is provided with a limiting part that abuts against the side of the positioning seat.

[0008] In one possible implementation, the protrusion has a through hole communicating with the cavity; the protrusion is a tapered structure with a smaller top and a larger bottom, and a sealing groove and a sealing ring installed in the sealing groove are provided on the outer side of the tapered structure; the inner wall of the cavity has a sealing surface that cooperates with the air spring boss.

[0009] In one possible implementation, the pressure plate is a circular plate, and the mounting hole is arranged coaxially with the pressure plate.

[0010] In one possible implementation, a plurality of the positioning seats are evenly spaced along the circumferential intervals of the pressure plate.

[0011] In one possible implementation, the pressure plate is provided with a positioning sleeve installed in the mounting hole, and the positioning sleeve has a stepped hole; the conical sleeve is provided with an annular flange that is fitted into the stepped hole.

[0012] In one possible implementation, the annular flange is provided with a sealing groove arranged around the protrusion and a sealing ring installed in the sealing groove, the sealing ring being used to form a sealing connection with the lower end face of the pressure head.

[0013] In one possible implementation, the pressure plate is provided with a plurality of flexible connectors, one end of which is connected to the pressure plate and the other end of which is connected to the corresponding positioning plate.

[0014] In one possible implementation, the upper end face of the pressure plate is provided with a plurality of upwardly protruding elongated mounting plates, and a plurality of positioning seats are respectively mounted on the plurality of elongated mounting plates; the lower end face of the pressure plate is provided with a plurality of elongated extrusion blocks for applying pressure to the air spring.

[0015] The beneficial effects of the static load test bench indenter fixture provided by this utility model are as follows: Compared with the prior art, the static load test bench indenter fixture of this utility model, during operation, firstly, the conical sleeve is embedded into the mounting hole of the pressure plate, ensuring that the lower end face of the conical sleeve is completely flush with the lower end face of the pressure plate, without any height difference; then, multiple positioning seats are evenly distributed along the circumferential direction of the mounting holes on the pressure plate, and fixed to the upper end face of the pressure plate by welding or bolts, ensuring that the positioning seats are evenly spaced and symmetrically aligned; next, the pressure plate is joined to the indenter from bottom to top, with the edge of the indenter located in the installation spacing, and the protrusion on the conical sleeve is fitted into the center hole of the indenter; then, a positioning plate is installed on the positioning seat, and the edge of the indenter is limited by the positioning plate, and then the positioning plate is connected to the positioning seat by fasteners, ensuring that the indenter and the pressure plate are securely fixed. The indenter is then started to move downwards, and the pressure plate is moved from top to bottom onto the upper cover plate of the air spring. The boss on the upper cover plate matches the cavity of the conical sleeve, realizing the testing of the air spring. In this way, by utilizing the rigid load-bearing capacity of the pressure plate and the centered positioning of the tapered sleeve, the force deviation in different areas of the air spring's upper cover plate is reduced, effectively preventing the middle part of the air spring from being lifted and deformed, ensuring the integrity of the air spring components, and preventing deformation of the center of the upper cover plate. Furthermore, by replacing the tapered sleeve with different specifications, it can be adapted to air springs of different sizes, resulting in greater compatibility. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the working state of the static load test bench indenter tooling provided in this embodiment of the utility model; Figure 2 A schematic diagram of the static load test bench indenter tooling provided in an embodiment of this utility model; Figure 3 A connection diagram of the positioning seat, positioning plate, and locking fastener provided in an embodiment of this utility model; Figure 4 A cross-sectional view of the tapered sleeve provided in an embodiment of this utility model; Figure 5 Schematic diagram of the structure of the pressure plate, positioning seat and positioning plate provided in the embodiments of this utility model Figure 1 ; Figure 6 Schematic diagram of the structure of the pressure plate, positioning seat and positioning plate provided in the embodiments of this utility model Figure 2 ; Figure 7 This is a schematic diagram of the structure of the pressure plate provided in an embodiment of the present utility model.

[0018] The following are the labeling elements in the figure: 10. Pressure plate; 11. Mounting hole; 12. Positioning sleeve; 13. Stepped hole; 14. Long strip mounting plate; 15. Long strip extrusion block; 20. Conical sleeve; 21. Cavity; 22. Protrusion; 23. Through hole; 24. Sealing groove; 25. Sealing ring; 26. Annular flange; 27. Sealing surface; 30. Positioning seat; 31. Horizontal through hole; 32. Vertical through hole; 40. Positioning plate; 41. Installation spacing; 42. Connecting hole; 43. Limiting part; 44. Bevel; 50. Locking fastener; 60. Air spring; 61. Boss; 70. Pressure head; 71. Center hole. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] 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.

[0023] Please see Figures 1 to 7The static load test bench indenter fixture provided by this utility model will now be described. A static load test bench indenter fixture includes a pressure plate 10, a conical sleeve 20, a positioning seat 30, a positioning plate 40, and a locking fastener 50. The pressure plate 10 has a through mounting hole 11. The pressure plate 10 acts on the air spring 60 from top to bottom. The conical sleeve 20 is fitted into the mounting hole 11 and connected to the pressure plate 10. The lower end face of the conical sleeve 20 is flush with the lower end face of the pressure plate 10. The lower end of the conical sleeve 20 has a cavity 21 for accommodating the protrusion 61 of the air spring 60, and the upper end has a protrusion that mates with the center hole 71 of the indenter 70. The part 22; there are multiple positioning seats 30, all of which are fixedly installed on the pressure plate 10; the multiple positioning seats 30 are arranged in a ring around the mounting hole 11; there are multiple positioning plates 40, which are detachably connected to the positioning seats 30; the positioning plates 40 are arranged horizontally, with one end located between the positioning seat 30 and the mounting hole 11, and the lower end face of the positioning plate 40 and the upper end face of the pressure plate 10 form an installation gap 41 for accommodating the pressure head 70; there are multiple locking fasteners 50, which are respectively installed on the corresponding positioning seats 30 and positioning plates 40.

[0024] The static load test bench indenter fixture provided by this utility model, compared with the prior art, utilizes the pressure plate 10 to provide a uniform load-bearing base, and combines the conical sleeve 20 to achieve the centered positioning of the air spring 60 and the indenter 70. Furthermore, the ring-shaped positioning seat 30 and the detachable positioning plate 40 ensure stable load transmission and adaptability to different air spring 60 specifications. Specifically, the pressure plate 10 serves as the main load transmission carrier, with a through mounting hole 11 for fixing the conical sleeve 20. The lower end face of the conical sleeve 20 is flush with the lower end face of the pressure plate 10, ensuring that both the pressure plate 10 and the conical sleeve 20 simultaneously contact the upper cover plate of the air spring 60, avoiding single-point stress on the original indenter 70 due to the intermediate movable spring structure. The concave cavity 21 at the lower end of the conical sleeve 20 can precisely accommodate the protrusion 61 of the air spring 60, preventing the air spring 60 from shifting laterally during the test. The protrusion 22 at the upper end cooperates with the center hole 71 of the indenter 70 to ensure the vertical orientation of the indenter 70. The load can be centrally transmitted to the central area of ​​the air spring 60 through the tapered sleeve 20, avoiding force deviation caused by load offset; multiple positioning seats 30 arranged in a ring around the mounting hole 11 provide a fixed base for the positioning plate 40. The detachable positioning plate 40 is horizontally arranged and one end extends between the positioning seat 30 and the mounting hole 11. The installation gap 41 formed by its lower end face and the upper end face of the pressure plate 10 can accommodate the edge part of the pressure head 70 and realize the fixed connection between the pressure head 70 and the pressure plate 10, ensuring that the pressure head 70, tooling and air spring 60 are always in a coaxial and close force transmission state.

[0025] During operation, firstly, the conical sleeve 20 is inserted into the mounting hole 11 of the pressure plate 10, ensuring that the lower end face of the conical sleeve 20 is completely flush with the lower end face of the pressure plate 10, without any height difference. Then, multiple positioning seats 30 are evenly distributed along the circumference of the mounting hole 11 on the pressure plate 10 and fixed to the upper end face of the pressure plate 10 by welding or bolts, ensuring that the positioning seats 30 are spaced evenly and axially symmetrical. Next, the pressure plate 10 is joined to the pressure head 70 from bottom to top, with the edge of the pressure head 70 located in the installation spacing 41, and the protrusion 22 on the conical sleeve 20 is fitted into the center hole 71 of the pressure head 70. Then, the positioning plate 40 is installed on the positioning seat 30, and the edge of the pressure head 70 is limited by the positioning plate 40. Finally, the positioning plate 40 is connected to the positioning seat 30 by the locking fastener 50, ensuring that the pressure head 70 and the pressure plate 10 are securely fixed. The pressure head 70 moves downwards, causing the pressure plate 10 to move downwards onto the upper cover plate of the air spring 60. The protrusion 61 on the upper cover plate matches the cavity 21 of the cone sleeve 20, enabling the testing of the air spring 60. In this way, the rigid bearing capacity of the pressure plate 10 and the central positioning of the cone sleeve 20 reduce the force deviation in different areas of the upper cover plate of the air spring 60, effectively preventing the middle part of the air spring 60 from being lifted and deformed, ensuring the integrity of the air spring 60 components, and preventing deformation of the center of the upper cover plate. Furthermore, different sizes of air springs 60 can be adapted by replacing the cone sleeve 20 with different specifications, resulting in higher compatibility.

[0026] Please see Figures 1 to 6 As a specific embodiment of the static load test bench indenter tooling provided by this utility model, the positioning seat 30 has a horizontal through hole 31 and a vertical through hole 32 arranged in a cross pattern. The positioning plate 40 is provided with a connecting hole 42 corresponding to the vertical through hole 32. The positioning plate 40 slides into the horizontal through hole 31. The locking fastener 50 is a pin that passes through the vertical through hole 32 and the connecting hole 42 from top to bottom. The horizontal through hole 31 and the vertical through hole 32 on the positioning seat 30 are arranged in a cross pattern. After the indenter 70 is connected to the pressure plate 10, the positioning plate 40 is slidably inserted into the horizontal through hole 31. The other end of the positioning plate 40 is limited on the indenter 70. Then, the pin passes through the vertical through hole 32 and the connecting hole 42 of the positioning plate 40 from top to bottom, so as to reliably connect the positioning plate 40 and the positioning seat 30 together. In this way, the transverse through hole 31 forms a guiding constraint on the positioning plate 40, preventing it from shifting during sliding. The vertical pin is rigidly locked by precisely corresponding to the hole position, preventing the positioning plate 40 from loosening during the test and ensuring the stable position of the pressure head 70 tooling.

[0027] The lower side of the end of the positioning plate 40 located above the pressure head 70 is provided with a bevel 44 to facilitate the matching and installation of the positioning plate 40 and the pressure head 70 and to prevent the positioning plate 40 from touching the pressure head 70.

[0028] Please see Figure 3 , Figure 5 and Figure 6 As a specific embodiment of the static load test bench indenter fixture provided by this utility model, the transverse through hole 31 is a rectangular hole, and the positioning plate 40 is a square plate that mates with the rectangular hole. One end of the positioning plate 40 is provided with a limiting part 43 that abuts against the side of the positioning seat 30. The transverse through hole 31 is designed as a rectangular hole, and the positioning plate 40 correspondingly adopts a square plate structure. The two form a suitable rectangular fit, increasing the contact area between the positioning plate 40 and the indenter 70, ensuring the stability and reliability of the indenter 70. Simultaneously, one end of the positioning plate 40 is provided with a limiting part 43 that abuts against the side of the positioning seat 30. The cross-sectional area of ​​the limiting part 43 is larger than the cross-section of the transverse through hole 31. This structure eliminates relative rotation. The non-circular fit between the rectangular hole and the square plate effectively restricts the circumferential rotation of the positioning plate 40 within the transverse through hole 31, preventing the pressure head 70 from shifting due to rotation during static load testing and ensuring accurate force direction during testing. Furthermore, the larger contact surface of the rectangular fit makes it less prone to lateral tilting when the positioning plate 40 is slidably installed, ensuring controllable positional accuracy during adjustment. Moreover, once the positioning plate 40 is inserted into the transverse through hole 31, the limiting part 43 abuts against the side of the positioning seat 30 to quickly determine the installation reference without the need for additional measurement and calibration.

[0029] Please see Figure 1 , Figure 2 and Figure 4 As a specific embodiment of the static load test bench indenter tooling provided by this utility model, the protrusion 22 is provided with a through hole 23 communicating with the cavity 21; the protrusion 22 is a conical structure with a smaller upper part and a larger lower part, and a sealing groove 24 and a sealing ring 25 installed in the sealing groove 24 are provided on the outer side of the conical structure; the inner wall of the cavity 21 has a sealing surface 27 that cooperates with the protrusion 61 of the air spring 60; the air pressure in the cavity 21 can be balanced by the through hole 23, so as to avoid the pressure difference from affecting the sealing effect; the conical structure with a smaller upper part and a larger lower part facilitates the precise docking of the protrusion 22 and the cavity 21, reducing the assembly difficulty; the combination of the sealing groove 24 and the sealing ring 25, together with the sealing surface 27 of the inner wall of the cavity 21, forms a double sealing barrier, which can effectively block gas leakage; at the same time, the design of the conical structure and the sealing ring 25 also enhances the durability of the tooling. A sealing groove 24 and a sealing ring 25 are arranged on the outer surface of the boss 61 of the air spring 60. After the boss 61 and the cavity 21 are installed together, the tapered sleeve 20 and the air spring 60 are sealed together under the action of the sealing surface 27. This ensures that the pressure is stable during the test and meets the requirements of the pressure holding operation. The stable sealing and pressure holding environment can avoid the deviation of test data caused by pressure fluctuations and improve the accuracy of static load test results.

[0030] Please see Figure 1 and Figure 2 , Figures 5 to 7As a specific embodiment of the static load test bench indenter fixture provided by this utility model, the pressure plate 10 is a circular plate, and the mounting hole 11 is coaxially arranged with the pressure plate 10. The symmetrical and coaxial structural design ensures that the center of force on the pressure plate 10 coincides with the center of the mounting hole 11, forming a balanced force transmission path. The symmetrical structure of the circular plate allows the pressure during the static load test to be evenly distributed to all areas of the pressure plate 10, avoiding local stress concentration due to shape asymmetry and reducing the risk of deformation of the pressure plate 10. The coaxial arrangement of the mounting hole 11 with the pressure plate 10 ensures that when the indenter 70 transmits pressure through the mounting hole 11, the line of action of the force accurately points to the center of the pressure plate 10, avoiding off-center loading and ensuring stable force direction during the test.

[0031] Please see Figure 5 and Figure 6 As a specific embodiment of the static load test bench indenter fixture provided by this utility model, multiple positioning seats 30 are evenly arranged at intervals along the circumference of the pressure plate 10. From the perspective of force, the evenly distributed positioning seats 30 firmly and reliably fix the pressure plate 10 and the indenter 70, so that the static load pressure borne by the pressure plate 10 is evenly transmitted to the fixture body, avoiding deformation or loosening of the pressure plate 10 caused by local force concentration, and ensuring the overall structural stability of the fixture. From the perspective of positioning accuracy, the circumferentially even arrangement can form a symmetrical constraint on the pressure plate 10, preventing the pressure plate 10 from shifting or tilting during the test, ensuring that the action point of the indenter 70 is always aligned with the test reference, and improving the accuracy of the test data.

[0032] Please see Figure 2 , Figure 5 and Figure 6 As a specific embodiment of the static load test bench indenter tooling provided by this utility model, the pressure plate 10 is provided with a positioning sleeve 12 installed in the mounting hole 11, and the positioning sleeve 12 is provided with a stepped hole 13; the cone sleeve 20 is provided with an annular flange 26 that is fitted into the stepped hole 13; the positioning sleeve 12 is fixed in the mounting hole 11, and its stepped hole 13 provides a precise installation reference for the cone sleeve 20. The annular flange 26 of the cone sleeve 20 can be tightly engaged with the stepped hole 13 to achieve axial limiting and radial positioning of the two. This structure improves assembly accuracy. The positioning sleeve 12 compensates for machining errors in the mounting hole 11, and the fit between the stepped hole 13 and the annular flange 26 ensures that the tapered sleeve 20 and the pressure plate 10 are coaxial, preventing the pressure head 70 from being misaligned. It also enhances structural stability. The engagement between the annular flange 26 and the stepped hole 13 can withstand axial pressure during testing, preventing the tapered sleeve 20 from loosening. At the same time, the positioning sleeve 12 provides radial support to the tapered sleeve 20, reducing deformation under stress. Furthermore, as a transition component, the positioning sleeve 12 protects the mounting hole 11 of the pressure plate 10 from wear. When replacing the tapered sleeve 20 later, it is not necessary to disassemble the pressure plate 10; only the positioning sleeve 12 needs to be removed.

[0033] Please see Figure 2 and Figure 4 As a specific embodiment of the static load test bench indenter fixture provided by this utility model, the annular flange 26 is provided with a sealing groove 24 arranged around the protrusion 22 and a sealing ring 25 installed in the sealing groove 24. The sealing ring 25 is used to form a sealing connection with the lower end face of the indenter 70. The sealing connection is achieved by the sealing ring 25 fitting against the lower end face of the indenter 70. The annular arrangement around the protrusion 22 can form a complete sealing ring to prevent leakage. The tight fit between the sealing ring 25 and the lower end face of the indenter 70 can maintain a stable sealing environment during the static load test and avoid pressure loss affecting the accuracy of the data.

[0034] As a specific embodiment of the static load test bench indenter fixture provided by this utility model, the pressure plate 10 is provided with multiple flexible connectors, one end of which is connected to the pressure plate 10 and the other end is connected to the corresponding positioning plate 40. The flexible connectors maintain the fixing function between the positioning plate 40 and the pressure plate 10, preventing the positioning plate 40 from being lost and facilitating the installation of the positioning plate 40 and the positioning seat 30. At the same time, the flexible connectors also make the installation of the positioning plate 40 convenient. The flexible connectors can be chains, flexible ropes, etc.

[0035] Please see Figure 6 and Figure 7 As a specific embodiment of the static load test bench pressure head fixture provided by this utility model, the upper end face of the pressure plate 10 is provided with multiple upwardly protruding elongated mounting plates 14, and multiple positioning seats 30 are respectively mounted on the multiple elongated mounting plates 14; the lower end face of the pressure plate 10 is provided with multiple elongated extrusion blocks 15 for applying pressure to the air spring 60; the multiple elongated mounting plates 14 on the upper end face provide independent and regular mounting carriers for the positioning seats 30, while the multiple elongated extrusion blocks 15 on the lower end face serve as pressure-applying components that contact the air spring 60, forming a layout with clear upper and lower functional zones. The elongated mounting plates 14 enhance the connection stability between the positioning seats 30 and the pressure plate 10, reducing the risk of the positioning seats 30 loosening during the test; while the elongated extrusion blocks 15 make the contact surface between the pressure plate 10 and the upper cover plate of the air spring 60 more uniform, so that the static load pressure is evenly transmitted to the surface of the air spring 60, avoiding excessive local pressure that could damage the air spring 60 or cause uneven force, and ensuring the accuracy of the test data.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A static load test bench indenter fixture, characterized in that, include: The pressure plate has a through mounting hole; the pressure plate is used to act on the air spring from top to bottom; A tapered sleeve is fitted onto the mounting hole and connected to the pressure plate; the lower end face of the tapered sleeve is flush with the lower end face of the pressure plate; the lower end of the tapered sleeve is provided with a cavity for accommodating the air spring boss, and the upper end is provided with a protrusion that fits into the center hole of the pressure head. Multiple positioning seats are fixedly installed on the pressure plate; the multiple positioning seats are arranged in a ring around the mounting hole; Multiple positioning plates are detachably connected to the positioning seat; the positioning plates are arranged horizontally, with one end located between the positioning seat and the mounting hole, and an installation gap is formed between the lower end face of the positioning plate and the upper end face of the pressure plate; Multiple locking components are installed on the corresponding positioning bases and positioning plates, respectively.

2. The static load test bench indenter fixture as described in claim 1, characterized in that, The positioning base has horizontal and vertical through holes arranged in a cross pattern. The positioning plate has a connecting hole corresponding to the vertical through hole. The positioning plate slides into the horizontal through hole. The locking device is a pin that passes through the vertical through hole and the connecting hole from top to bottom.

3. The static load test bench indenter fixture as described in claim 2, characterized in that, The transverse through hole is a rectangular hole, the positioning plate is a square plate that is installed in conjunction with the rectangular hole, and one end of the positioning plate is provided with a limiting part that abuts against the side of the positioning seat.

4. The static load test bench indenter fixture as described in claim 1, characterized in that, The protrusion has a through hole that communicates with the cavity; the protrusion is a tapered structure that is smaller at the top and larger at the bottom, and a sealing groove and a sealing ring installed in the sealing groove are provided on the outer side of the tapered structure; the inner wall of the cavity has a sealing surface that cooperates with the air spring boss.

5. The static load test bench indenter fixture as described in claim 1, characterized in that, The pressure plate is a circular plate, and the mounting holes are arranged coaxially with the pressure plate.

6. The static load test bench indenter fixture as described in claim 5, characterized in that, The plurality of positioning seats are evenly spaced along the circumferential direction of the pressure plate.

7. The static load test bench indenter fixture as described in claim 1, characterized in that, The pressure plate is provided with a positioning sleeve installed in the mounting hole, and the positioning sleeve has a stepped hole; the conical sleeve is provided with an annular flange that fits into the stepped hole.

8. The static load test bench indenter fixture as described in claim 7, characterized in that, The annular flange is provided with a sealing groove arranged around the protrusion and a sealing ring installed in the sealing groove. The sealing ring is used to form a sealing connection with the lower end face of the pressure head.

9. The static load test bench indenter fixture as described in claim 1, characterized in that, The pressure plate is provided with multiple flexible connectors, one end of which is connected to the pressure plate and the other end is connected to the corresponding positioning plate.

10. The static load test bench indenter fixture as described in claim 1, characterized in that, The upper end face of the pressure plate is provided with a plurality of upwardly protruding elongated mounting plates, and a plurality of positioning seats are respectively mounted on the plurality of elongated mounting plates; the lower end face of the pressure plate is provided with a plurality of elongated extrusion blocks for applying pressure to the air spring.

Images