Thread load holding test device and test method thereof

Abstract

The invention discloses a thread load holding test device and a test method thereof, and relates to the field of test benches. The thread load holding test device comprises a second base, a second connecting hemisphere, a first stud, a connecting rod, a connecting bolt and other structures. The connecting bolt penetrates through the first connecting hemisphere; a first spherical hole is formed in the bottom of the upper connecting seat, and the first connecting hemisphere is placed in the first spherical hole; the load sensor is arranged on the cross beam and is connected with the upper part of the upper connecting seat through a second stud, an ejector rod, a pin shaft and a connecting cylinder; wherein the transverse beam is controlled to move upwards, so that the load holding force of the test sample piece is tested. The device can be adapted to test sample pieces in different shapes, a thread load holding test can be quickly and effectively carried out by replacing one or two parts in the device, and the test efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of test bench technology, specifically to a threaded load holding test device and its test method. Background Technology

[0002] The automotive suspension system is a crucial assembly within the vehicle's chassis system, elastically connecting the frame and wheels and influencing various performance characteristics of the vehicle. Its function is to transmit forces and torques between the wheels and the frame, while simultaneously cushioning impacts from uneven road surfaces, reducing vibrations and ensuring a smooth ride. The suspension system is subjected to forces during driving, and its structure and design affect the vehicle's handling and comfort. The reliability of the suspension system directly impacts the vehicle's normal operation and the safety of its occupants, especially since it is subjected to varying impacts and fatigue loads during driving. Therefore, the strength, fatigue resistance, and other mechanical properties of the suspension system require higher standards. Thus, one of the most important tasks during the product development cycle is ensuring that the fatigue life and strength of the automotive suspension system meet the demands of various operating conditions.

[0003] With the accelerated development of various vehicle models and the increasingly shorter R&D cycles, continuously strengthening the R&D efforts in automotive suspension system testing and improving the overall mechanical performance of automotive suspension systems to meet the needs of various road conditions has become an urgent requirement for the development of the automotive industry.

[0004] As a key component of the automotive suspension system, the strength verification of its related threaded components is crucial for the subframe. Meanwhile, integrated die-cast chassis components are becoming increasingly standardized, integrating chassis parts into a single unit, which itself contains numerous threaded components. Threaded load-bearing tests are almost mandatory for threaded components and integrated die-cast components in critical subframe locations. Because threaded components come in various sizes and specifications, including internal and external threads, and the test locations require cutting before testing, resulting in varying shapes, there is currently no standardized testing equipment for threaded load-bearing verification.

[0005] Therefore, in view of the problems existing in the prior art, the designer of this invention, based on years of experience in this industry, actively researched and improved the technology, and thus came up with the present invention, a threaded load-bearing test device. Summary of the Invention

[0006] In view of this, the present invention aims to provide a thread load holding test device and test method, which can be adapted to test specimens of different shapes. By replacing one or two of the internal components, thread load holding tests can be carried out quickly and effectively, thereby improving test efficiency.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0008] A threaded load-bearing test device includes a second base fixed to a test connecting plate by a quick-release plate; a second connecting hemisphere connected to the upper part of the base through a second spherical hole; a first stud passing through the second connecting hemisphere and connecting to a test specimen; a connecting rod connected to the other end of the first stud; a connecting bolt connected to the connecting rod; a first connecting hemisphere through which the connecting bolt passes; an upper connecting seat with a first spherical hole at the bottom, the first connecting hemisphere being placed inside the first spherical hole; and a load sensor mounted on a crossbeam and connected to the upper part of the upper connecting seat via the second stud, a push rod, a pin, and a connecting cylinder; wherein, by controlling the upward movement of the crossbeam, the load-bearing capacity of the test specimen is tested.

[0009] In some embodiments, the second connecting hemisphere and the top plate of the second base are spherically fitted, and the first connecting hemisphere and the lower disk of the upper connecting seat are spherically fitted. The first connecting hemisphere, the second connecting hemisphere, and related components therebetween together form a two-force bar structure.

[0010] In some embodiments, the second base includes a bottom plate and a top plate, the bottom plate and the top plate being provided with multiple rows of first countersunk bolt holes and fourth countersunk bolt holes for adjusting the distance between the two upright plates.

[0011] In some embodiments, a circular column is provided between the base plate and the top plate to increase the strength of the base, and the column can be replaced when the shape of the test specimen is complex.

[0012] In some embodiments, the push rod and the connecting cylinder are connected by a pin, which can be removed to allow for the disassembly of the related components below.

[0013] In some embodiments, the thread specification of the connecting bolt is at least two thread grades larger than the thread specification of the test specimen.

[0014] In some embodiments, the first stud is externally connected to the connecting rod via an external thread, and the other end of the first stud is provided with a fifth threaded hole connected to the test specimen.

[0015] In some embodiments, a magnetic bubble level is provided at the upper end of the connecting bolt to adjust the connecting bolt to be in a vertical state.

[0016] A thread load holding test method, based on the aforementioned thread load holding test apparatus, includes the following steps:

[0017] S1: Determine whether the test specimen has internal or external threads, and adjust the second adjustment base to accommodate the test specimen;

[0018] S2: Connect the connecting cylinder to the load sensor;

[0019] S3: Connect the push rod to the upper connecting seat;

[0020] S4: Connect the connecting cylinder and the push rod with a pin;

[0021] S5: Pass the connecting bolt through the first connecting hemisphere and place it in the first spherical hole of the upper connecting seat;

[0022] S6: Connect the connecting bolt to the connecting rod;

[0023] S7: Pass the test specimen through the second connecting hemisphere and connect it to the first stud;

[0024] S8: Control the crossbeam to move to the appropriate position so that the first stud is screwed into the connecting rod;

[0025] S9: Control the crossbeam tension to an appropriate value to ensure that the second base does not leave the test connection plate;

[0026] S10: Use a magnetic bubble level to adjust the connecting bolts to a vertical position;

[0027] S11: Control the crossbeam to descend so that the test specimen is not stressed, and use the quick-pressing plate to fix the second base to the test connection plate;

[0028] S12: Lift the crossbeam to eliminate the gap and start the test. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0030] Figure 1 This is a schematic diagram of the overall structure of a threaded load-bearing test device according to the present invention.

[0031] Figure 2 This is a schematic diagram of the clamping device of a threaded load test apparatus according to the present invention.

[0032] Figure 3 This is an exploded view of the clamping device of a threaded load holding test apparatus according to the present invention. Figure 1 .

[0033] Figure 4 This is an exploded view of the clamping device of a threaded load holding test apparatus according to the present invention. Figure 2 .

[0034] Explanation of reference numerals in the attached figures

[0035] 1. Testing machine; 2. First base; 3. Test connecting plate; 4. First threaded hole; 5. Quick-release plate; 6. Clamping device; 7. Load sensor; 8. Second base; 9. Base plate; 10. Vertical plate; 11. Circular column; 12. Test specimen; 13. Top plate; 14. First countersunk bolt hole; 15. First fastener; 16. First stud; 17. Connecting rod; 18. Connecting bolt; 19. Lower disc; 20. Magnetic bubble level; 21. Arc column; 22. Upper disc; 23. Upper connecting seat; 24. Second countersunk bolt hole; 25. Second fastener; 26. Top rod; 27. Pin; 28. Connecting cylinder; 29. ​​First... 30. Pin hole, second threaded hole, 31. First mounting surface, 32. First spherical hole, 33. First through hole, 34. Second mounting surface, 35. Second through hole, 36. Stud, 37. Third mounting surface, 38. First connecting hemisphere, 39. Third through hole, 40. Second connecting hemisphere, 41. Fourth mounting surface, 42. Fourth through hole, 43. Fifth through hole, 44. Countersunk hole, 45. Third threaded hole, 46. Second spherical hole, 47. Third countersunk bolt hole, 48. Third fastener, 49. Fourth threaded hole, 50. Crossbeam, 51. Lead screw column, 52. Fourth countersunk bolt hole, 53. Fifth threaded hole, 54. Second stud. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The following is for reference. Figures 1 to 4 The thread load holding test device and test method of the present invention are described in conjunction with the embodiments.

[0039] A threaded load-bearing capacity testing device includes a second base 8 fixed to a test connecting plate 3 via a quick-release plate 5. A second connecting hemisphere 40 is connected to the upper part of the second base 8 via a second spherical hole 46. A first stud 16 passes through the second connecting hemisphere 40 and connects to a test specimen 12. The other end of the first stud 16 is sequentially connected to a connecting rod 17 and a connecting bolt 18. The connecting bolt 18 passes through the first connecting hemisphere 38, which is placed within a first spherical hole 32 at the bottom of an upper connecting seat 23. The upper part of the upper connecting seat 23 is connected to a load sensor mounted on a crossbeam via a second stud 54, a push rod 26, a pin 27, a connecting cylinder 28, and a load sensor mounted on a crossbeam. The crossbeam 50 is moved upwards under software control to test the load-bearing capacity of the test specimen 12.

[0040] The top plate 13 and the second connecting hemisphere 40 are spherically fitted, as are the lower disc 19 and the first connecting hemisphere 38. The first connecting hemisphere 38, the second connecting hemisphere 40, and related components together form a two-force member structure. The bottom plate 9 and the top plate 13 are provided with multiple rows of first countersunk bolt holes 14 and fourth countersunk bolt holes 52, allowing adjustment of the distance between the two upright plates 10. A circular column 11 is provided between the bottom plate 9 and the top plate 13 to increase the strength of the second base 8. When the shape of the test specimen 12 is complex, the upright plate 10 can be replaced. The top rod 26 and the connecting barrel 28 are connected by a pin 27. Removing the pin 27 facilitates the disassembly of the related components below.

[0041] The thread specification of the connecting bolt 18 is at least two thread grades larger than that of the test specimen 12 to ensure the smooth conduct of the test. The first stud 16 is externally connected to the connecting rod 17 via an external thread. The other end of the first stud 16 is provided with a fifth threaded hole 53 connected to the test specimen 12. The upper end of the connecting bolt 18 is provided with a magnetic bubble level 20 to adjust the connecting bolt 18 to be in a vertical state.

[0042] Figure 1 This is a schematic diagram of the overall structure of a threaded load-bearing test device according to the present invention. Two lead screw columns 51 are mounted on top of a first base 2 via fasteners. A motor is installed inside the first base 2, which drives the lead screws inside the columns 51 to rotate via a corresponding transmission mechanism. The rotation of the lead screws causes the crossbeam 50 to move vertically. A load sensor 7 is connected to the crossbeam 50 via fasteners. A test connecting plate 3 is fixed to the upper part of the first base 2 via fasteners. The test connecting plate 3 has multiple rows and columns of first threaded holes 4. The above structure constitutes the testing machine 1. The clamping device 6 is mounted below the first threaded holes 4 of the test connecting plate 3 via a quick-pressing plate 5, and is connected to the load sensor 7 above via fasteners. When the crossbeam 50 moves upward, it stretches the clamping device 6, and the load sensor 7 can then provide feedback on the threaded load-bearing force.

[0043] Figure 2 This is an overall schematic diagram of the clamping device of the present invention. Figure 3This is an exploded view of the clamping device of the present invention. Figure 1 , Figure 4 This is an exploded view of the clamping device of the present invention. Figure 2 The second base 8 consists of a base plate 9, two upright plates 10, several circular columns 11, and a top plate 13. The second base 8 has multiple rows and columns of fourth countersunk bolt holes 52, and the top plate 13 has multiple rows and columns of first countersunk bolt holes 14. Based on experience, the two upright plates 10 are fixed to a suitable position between the base plate 9 and the top plate 13 using first fasteners 15. Circular columns 11 are used around the test specimen 12 to increase the overall strength of the second base 8. Third threaded holes 45 are provided on both sides of the circular columns 11, which are also fixed to a suitable position between the base plate 9 and the top plate 13 using first fasteners 15. If the test specimen 12 has a complex shape, multiple circular columns 11 can be used to replace the upright plates 10 to obtain installation space for the test specimen 12. The top plate 13 has a second through hole 35 at the top and a second spherical hole 46 at the bottom. The diameter of the second through hole 35 is larger than that of the connecting rod 17, facilitating the assembly and disassembly of the test specimen 12.

[0044] The second connecting hemisphere 40 is installed in the second spherical hole 46. A fourth mounting surface 41 is provided around the second connecting hemisphere 40 for wrench operation, etc. A fourth through hole 42 is provided in the center of the second connecting hemisphere 40. The test specimen 12 is placed on the flat end of the second connecting hemisphere 40, and the stud 36 on the test specimen 12 extends into the fourth through hole 42 of the second connecting hemisphere 40. The first stud 16 passes through the fourth through hole 42 and is connected to the stud 36 through the fifth threaded hole 53. If the test specimen 12 has an internal threaded hole, a stud of the corresponding specification is used to connect the test specimen 12 and the first stud 16. The test measures the thread strength of the stud 36 or the internal thread on the test specimen 12. For different thread specifications of the test specimen 12, multiple first studs 16 of the corresponding thread specifications and second connecting hemispheres 40 with fourth through holes 42 of different diameters can be prepared. The thread specification of the connecting bolt 18 should be set larger, at least two thread grades larger than the test thread of the largest conventional test specimen 12.

[0045] The first stud 16 has an external thread on its outer diameter and is connected to the connecting rod 17 via the thread. Both sides of the connecting rod 17 have internal threaded holes, and the other side of the connecting rod 17 is connected to the connecting bolt 18 via a thread. The upper connecting seat 23 consists of a lower disc 19, two arc-shaped columns 21, and an upper disc 22. The upper disc 22 has second countersunk bolt holes 24 on both sides, connected via second fasteners 25 and threaded holes on the end faces of the arc-shaped columns 21. The upper disc 22 and the lower disc 19 have a first mounting surface 31 and a second mounting surface 34 on their respective sides for easy wrench operation. The lower disc 19 has a third countersunk bolt hole 47 at its bottom, connected via a third fastener 48 and threaded holes on the end faces of the arc-shaped columns 21. A first spherical hole 32 is formed in the middle of the lower disc 19, and a first through hole 33 is formed at the root of the first spherical hole 32. The first connecting hemisphere 38 is installed in the first spherical hole 32. A third mounting surface 37 is provided around the first connecting hemisphere 38 for wrench operation, etc. A third through hole 39 is provided in the center of the first connecting hemisphere 38. The first connecting hemisphere 38, the second connecting hemisphere 40, and related components together form a two-force bar structure, ensuring the test specimen 12 is in a free-force state. The connecting bolt 18 passes through the third through hole 39 and the first through hole 33, and is threadedly connected to the connecting rod 17. A magnetic bubble level 20 is provided at the top of the connecting bolt 18 to adjust whether the connecting bolt 18 is in a vertical position.

[0046] The upper disc 22 has a fourth threaded hole 49 in the middle, which is connected to the push rod 26 through the second stud 54. The push rod 26 has a fifth through hole 43 at the top. The bottom of the connecting cylinder 28 has a countersunk hole 44 to accommodate the push rod 26. Several first pin holes 29 are opened in the upper part of the connecting cylinder 28, and a second threaded hole 30 is opened in the top of the connecting cylinder 28. The load sensor 7 is connected through the second stud 54. The pin 27 passes through the first pin holes 29 and the fifth through hole 43 to connect the push rod 26 and the connecting cylinder 28.

[0047] Based on the above embodiments, the experimental methods are summarized as follows:

[0048] S1: Determine whether the test specimen 12 has an internal or external thread, and whether the second base 8 can accommodate the test specimen 12. If the space is not suitable, adjust the position of the upright plate 10 and the round column 11.

[0049] S2: Connect the connecting cylinder 28 to the load sensor 7;

[0050] S3: Connect the push rod 26 to the upper connecting seat 23;

[0051] S4: Connect the connecting cylinder 28 and the connecting seat 23 with the push rod 26 using the pin 27;

[0052] S5: Pass the connecting bolt 18 through the first connecting hemisphere 38 and place it in the first spherical hole 32;

[0053] S6: Connect the connecting rod 17 to the connecting bolt 18;

[0054] S7: The stud 36 on the test specimen 12 passes through the fourth through hole 426 on the second connecting hemisphere 40 and connects to the first stud 16;

[0055] S8: Control the crossbeam 50 to move to the appropriate position until the first stud 16 can be screwed into the connecting rod 17 to the appropriate depth;

[0056] S9: Control the appropriate tension value of the crossbeam 50 to ensure that the second base 8 does not leave the test connection plate 3;

[0057] S10: Place the magnetic bubble level 20 above the connecting bolt 18, and move the second base 8 to adjust the connecting bolt 18 to be vertical;

[0058] S11: Control the crossbeam 50 to descend appropriately so that the test specimen 12 is not under stress, and use the quick-pressing plate 5 to fix the second base 8 to the test connection plate 3;

[0059] S12: Raise the crossbeam by 50 to eliminate the gap, and then start the test.

[0060] Compared with the prior art, the thread load holding test device and test method of the present invention have the following advantages:

[0061] The thread load holding test device and method disclosed in this invention are adaptable to test specimens of different shapes. By replacing one or two of the internal components, thread load holding tests can be carried out quickly and effectively, improving test efficiency. This invention is worthy of promotion and use in the industry.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify 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 limiting the scope of protection of this invention.

[0063] 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a connection that allows communication between them; 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 invention according to the specific circumstances.

[0065] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A threaded load-bearing test device, characterized in that, The system includes a second base (8), which is fixed to the test connecting plate (3) by a quick-release plate (5); a second connecting hemisphere (40), which is connected to the upper part of the second base (8) through a second spherical hole (46); a first stud (16), which passes through the second connecting hemisphere (40) and connects to the test specimen (12); a connecting rod (17), which is connected to the other end of the first stud (16); a connecting bolt (18), which is connected to the connecting rod (17); and a first connecting hemisphere (38), which is connected to the connecting bolt (18). The first connecting hemisphere (38) passes through the upper connecting seat (23), which has a first spherical hole (32) at the bottom, and the first connecting hemisphere (38) is placed in the first spherical hole (32); and a load sensor (7) is set on the crossbeam (50) and connected to the upper part of the upper connecting seat (23) through the second stud (54), the top rod (26), the pin (27), and the connecting cylinder (28); wherein, by controlling the crossbeam (50) to move upward, the test specimen (12) is subjected to a load-bearing capacity test.

2. The thread load holding test device according to claim 1, characterized in that, The second connecting hemisphere (40) and the top plate (13) of the second base (8) are spherically fitted, and the first connecting hemisphere (38) and the lower disk (19) of the upper connecting seat (23) are spherically fitted. The first connecting hemisphere (38) and the second connecting hemisphere (40) and their related components together form a two-force bar structure.

3. The thread load holding test device according to claim 1, characterized in that, The second base (8) includes a bottom plate (9) and a top plate (13). The bottom plate (9) and the top plate (13) are provided with multiple rows of first countersunk bolt holes (14) and fourth countersunk bolt holes (52) for adjusting the distance between the two upright plates (10).

4. The thread load holding test device according to claim 3, characterized in that, A circular column (11) is provided between the base plate (9) and the top plate (13) to increase the strength of the second base (8) and to replace the column (10) when the shape of the test specimen (12) is complex.

5. The thread load holding test device according to claim 1, characterized in that, The top rod (26) and the connecting cylinder (28) are connected by a pin (27), which can be removed to disassemble the related parts below.

6. The thread load holding test device according to claim 1, characterized in that, The thread specification of the connecting bolt (18) is at least two thread grades greater than the thread specification of the test specimen (12).

7. The thread load holding test device according to claim 1, characterized in that, The first stud (16) is connected to the connecting rod (17) by external thread, and the other end of the first stud (16) is provided with a fifth threaded hole 53 connected to the test specimen (12).

8. The thread load holding test device according to claim 1, characterized in that, A magnetic bubble level (20) is provided at the upper end of the connecting bolt (18) to adjust the connecting bolt (18) to be in a vertical state.

9. A method for threaded load holding test, characterized in that, The thread load holding test apparatus according to any one of claims 1 to 8 comprises the following steps: S1: Determine whether the test specimen (12) has an internal or external thread, and adjust the second base (8) to accommodate the test specimen (12). S2: Connect the connecting cylinder (28) to the load sensor (7); S3: Connect the top rod (26) to the upper connecting seat (23); S4: Connect the connecting cylinder (28) and the push rod (26) with the pin (27); S5: Pass the connecting bolt (18) through the first connecting hemisphere (38) and place it in the first spherical hole (32) of the upper connecting seat (23); S6: Connect the connecting bolt (18) to the connecting rod (17); S7: Pass the test specimen (12) through the second connecting hemisphere (40) and connect it to the first stud (16); S8: Control the crossbeam (50) to move to the appropriate position so that the first stud (16) is screwed into the connecting rod (17); S9: Control the crossbeam (50) to apply an appropriate tension force to ensure that the second base (8) does not leave the test connection plate (3); S10: Use a magnetic bubble level (20) to adjust the connecting bolt (18) to a vertical position; S11: Control the crossbeam (50) to descend so that the test specimen (12) is not under force, and use the quick-press plate (5) to fix the second base (8) to the test connection plate (3); S12: Lift the crossbeam (50) to eliminate the gap and start the test.

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