A device for detecting the strength of a connection point of a structural member of a vehicle body

Abstract

This invention discloses a strength testing device for connection points of automotive body structural components, belonging to the field of automotive body structural component testing technology. It includes a frame and mounting brackets symmetrically fixed on the frame. A support plate is slidably connected to the mounting bracket. A first hydraulic cylinder is connected to the top of the frame, and a first pressure plate is fixedly connected to the output end of the first hydraulic cylinder. Through the coordinated action of a push block, guide block, limit block, locking block, and a fourth spring, when the crossbeam deforms or breaks during the connection point strength testing process, the crossbeam will press against the push rod. The push rod only needs to produce a slight displacement to push the guide block, causing the limit block to shift, thus releasing the locking block. At this time, the stretched fourth spring resets, pulling the locking block downwards, causing the insulating plate at the bottom of the locking block to insert between the two metal blocks, thereby disconnecting the circuit of the second hydraulic cylinder and terminating the bending performance test of the crossbeam, effectively avoiding unnecessary extra workload.

Description

Technical Field

[0001] This invention relates to the field of automotive body structural component testing technology, specifically a device for testing the strength of connection points of automotive body structural components. Background Technology

[0002] The car body is a rigid spatial frame constructed from welded longitudinal beams, cross beams, and struts, supporting all the components of the vehicle. As a type of cross beam, the anti-collision beam is installed at both ends of the car body and is mainly used to absorb energy and protect the body components during low-to-medium speed collisions. As a critical component, the cross beam must undergo compressive strength testing before leaving the factory. Only after passing the test can it enter the production and assembly stage. The traditional static loading test method is the three-point bending test, which involves fixing both ends of the anti-collision beam and applying a vertical load at the connection point to measure its deformation, yield strength, and fracture point, thereby testing the connection strength of the cross beam connection point.

[0003] An investigation revealed that a Chinese invention patent (publication number: CN116558967B) discloses a crossbeam reinforcement plate resistance strength detector for automotive parts processing. The detector includes a frame, electric slide rails, and a strength detector. Electric slide rails are connected to both the left and right sides of the frame, and the strength detector is connected between the slide rails via sliders. The detector also includes a positioning mechanism and an insertion mechanism. A positioning mechanism for positioning and aligning the crossbeam is provided between the frame and the sliders of the electric slide rails. An insertion mechanism for limiting the crossbeam is located in the middle of the frame. The crossbeam is placed in the middle of the frame, and the insertion mechanism is inserted into the hole in the crossbeam to limit its position. This simulates the crossbeam being installed on a car, and the strength detector then tests the crossbeam's compressive strength.

[0004] While the aforementioned patent uses an insertion rod inserted into the holes of the crossbeam to limit its position and simulate its installation on a car, thus simulating the compressive strength test of a crossbeam installed on a car and improving accuracy, the current device does not have the function of testing the overall bending performance of the crossbeam. It requires not only applying a vertical load to test the strength of the crossbeam connection points but also evaluating the overall bending performance of the crossbeam to meet its collision protection requirements. Traditional testing methods typically test the connection point strength and overall bending performance of the crossbeam separately. This not only requires expensive independent testing equipment but also necessitates workers to place the crossbeam on different testing devices sequentially, a cumbersome and time-consuming process. To combine connection point testing and overall bending performance testing, it is essential to ensure that the crossbeam does not deform or break after testing the connection point strength. If the crossbeam deforms or breaks, the conditions for testing bending performance are lost, and continuing testing would only unnecessarily increase the workload.

[0005] Therefore, the present invention provides a strength testing device for connection points of automotive body structural components to solve the above-mentioned problems. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] This invention provides a strength testing device for connection points of automotive body structural components, aiming to solve the problems mentioned in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides the following technical solution: a frame and mounting brackets symmetrically fixed on the frame, a support plate slidably connected to the mounting brackets, a first hydraulic cylinder connected to the top of the frame, and a first pressure plate fixedly connected to the output end of the first hydraulic cylinder, a second hydraulic cylinder fixedly connected between the mounting brackets and the frame, and a second pressure plate fixedly connected to the output end of the second hydraulic cylinder, a connecting bracket connected to the side wall of the first hydraulic cylinder, a cavity opened at the bottom of the connecting bracket, and a feedback mechanism provided within the cavity, the feedback mechanism including a push rod, a second spring, a push block, a guide block, a limit block, a locking block, and a fourth spring, a connecting block fixedly connected between the push rod and the push block, and the connecting block slidably connected within the cavity, the guide block and the limit block fixedly connected, and the two ends of the fourth spring fixedly connected to the locking block and the inner wall of the cavity, respectively;

[0010] The support plate is symmetrically provided with positioning posts, each positioning post having a connecting cavity, and the connecting cavity is provided with a positioning mechanism. The positioning mechanism includes a connecting rod, a stop block, a sixth spring, a mounting block, and multiple positioning rods. The connecting rod is fixedly connected to the stop block, the top of the connecting rod is fixedly connected to the mounting block, and the multiple positioning rods are rotatably connected to the mounting block.

[0011] As a preferred technical solution of this application, the top end of the push rod slides through the top of the cavity, the second spring is sleeved on the push rod, and the two ends of the second spring are fixedly connected to the connecting block and the inner wall of the cavity, respectively. A push block is fixedly connected to the bottom of the connecting block, and a first slider and a second slider are symmetrically fixed on both sides of the guide block and the locking block, respectively. The first slider and the second slider are both slidably connected to the side wall of the cavity, and a third spring is fixedly connected between the guide block and the inner wall of the cavity.

[0012] As a preferred technical solution of this application, a first cylinder is fixedly connected inside the cavity, a fourth spring is sleeved on the first cylinder, two elastic elements are fixedly connected inside the cavity, and a metal block is fixedly connected to each of the two elastic elements, with the two metal blocks abutting against each other. An insulating plate is symmetrically fixed to the bottom of the locking block.

[0013] As a preferred technical solution of this application, a partition is fixedly connected inside the connecting cavity, the connecting rod slides through the partition and the bottom of the connecting cavity, a plurality of cylindrical blocks are provided above the partition, and the cylindrical blocks are fixedly connected to the positioning posts, the positioning rod is provided with a movable groove, and the cylindrical blocks are movably connected in the movable groove, the sixth spring is sleeved on the connecting rod, and the two ends of the sixth spring are fixedly connected to the stop block and the inner wall of the connecting cavity, respectively.

[0014] As a preferred technical solution of this application, the positioning post slides through the support plate, the bottom of the support plate is fixedly connected to a U-shaped plate, the bottom of the positioning post is fixedly connected to a fixing block, the bottom of the fixing block is fixedly connected to a ring rod, and the bottom of the ring rod slides through the U-shaped plate. A fifth spring is sleeved on the ring rod, and the two ends of the fifth spring are fixedly connected to the fixing block and the U-shaped plate respectively.

[0015] As a preferred technical solution of this application, a second cylinder is fixedly connected between the support plate and the U-shaped plate, a fixed plate is fixedly connected to the output end of the second cylinder, and the connecting rod passes through the annular rod and is fixedly connected to the fixed plate.

[0016] As a preferred technical solution of this application, both the first pressure plate and the second pressure plate are provided with cylindrical cavities. Two first metal balls are provided in the cylindrical cavities. A first round rod slides through the end of the cylindrical cavity, and one end of the first round rod is fixedly connected to one of the first metal balls. A round plate is fixedly connected to the other end of the first round rod. The other first metal ball is fixedly connected in the connecting cavity. A first spring is sleeved on the first round rod, and the two ends of the first spring are fixedly connected to the first metal ball and the inner wall of the cylindrical cavity, respectively.

[0017] As a preferred technical solution of this application, the first metal ball is electrically connected to the second cylinder, and the first metal ball in the first pressure plate and the second pressure plate is connected in parallel in the circuit of the second cylinder.

[0018] As a preferred technical solution of this application, the side wall of the connecting frame is provided with an installation groove, the installation groove is provided with two second metal balls, a movable block is slidably connected in the installation groove, and a top block is fixedly connected to the movable block. A seventh spring is fixedly connected between the movable block and the inner wall of the installation groove, one of the second metal balls is fixedly connected to the movable block, and the other second metal ball is fixedly connected in the installation groove.

[0019] As a preferred technical solution of this application, the second metal ball is electrically connected to the first cylinder, and the two second metal balls are connected in series in the circuit of the first cylinder.

[0020] (III) Beneficial Effects

[0021] 1. By setting up the push block, guide block, limit block, locking block and the fourth spring in synergy, when the crossbeam deforms or breaks during the connection point strength test, the crossbeam will press the push rod. The push rod only needs to produce a small displacement to push the guide block and drive the limit block to move, which can release the limit on the locking block. At this time, the stretched fourth spring resets and pulls the locking block to move downward, so that the insulating plate at the bottom of the locking block is inserted between the two metal blocks, thereby disconnecting the circuit of the second hydraulic cylinder and terminating the bending performance test of the crossbeam, effectively avoiding unnecessary extra work.

[0022] 2. By setting multiple parallel first metal balls to control the start and stop of the second cylinder, when the crossbeam is tested for connection point strength or bending performance, once the first or second pressure plate comes into contact with the crossbeam, it will squeeze the circular plate and push the two first metal balls into contact with each other. At this time, the circuit of the second cylinder is closed, driving the second cylinder to drive the positioning rod to position the crossbeam. After the test is completed, the first or second pressure plate is reset, the two first metal balls separate, the circuit of the second cylinder is disconnected, thereby releasing the positioning rod from the crossbeam, which facilitates quick disassembly and replacement of the crossbeam and improves the testing efficiency. Attached Figure Description

[0023] Figure 1 A schematic diagram of a strength testing device for connection points of automotive body structural components;

[0024] Figure 2 A cross-sectional view of a strength testing device for connection points of automotive body structural components;

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0027] Figure 5 This is an internal structural diagram of a device for testing the strength of connection points of automotive body structural components.

[0028] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0029] Figure 7 This is a right-side cross-sectional view of a device for testing the strength of connection points of automotive body structural components.

[0030] Figure 8 for Figure 7 Enlarged view at point D;

[0031] Figure 9 for Figure 7 Enlarged view at point E in the middle;

[0032] Figure 10 for Figure 7 Enlarged view of point F in the middle.

[0033] In the picture:

[0034] 1. Frame; 2. Mounting bracket; 3. First hydraulic cylinder; 4. First pressure plate; 5. Second hydraulic cylinder; 6. Second pressure plate; 7. Support plate; 8. Connecting frame; 9. Positioning column; 10. U-shaped plate; 11. Cylindrical cavity; 12. First metal ball; 13. First round rod; 14. First spring; 15. Round plate; 16. Push rod; 17. Second spring; 18. Connecting block; 19. Push block; 20. Guide block; 21. Third spring; 22. Limiting block; 23. First slider; 24. Locking block; 25. Second slider; 26. Insulating plate; 27. Metal block; 28. Elastic element; 29. ​​First cylinder; 30. Fourth spring; 31. Fixing block; 32. Fifth spring; 33. Ring rod; 34. Fixing plate; 35. Second cylinder; 36. Connecting rod; 37. Stop block; 38. Sixth spring; 39. Mounting block; 40. Positioning rod; 41. Cylindrical block; 42. Second metal ball; 43. Movable block; 44. Seventh spring; 45. Top block; 46. Movable groove; 47. Partition plate. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0036] This invention provides a device for testing the strength of connection points of automotive body structural components, such as... Figures 1-10As shown, the technical solution includes a frame 1 and mounting brackets 2 symmetrically fixed on the frame 1. A support plate 7 is slidably connected to the mounting bracket 2. A first hydraulic cylinder 3 is connected to the top of the frame 1, and a first pressure plate 4 is fixedly connected to the output end of the first hydraulic cylinder 3. A second hydraulic cylinder 5 is fixedly connected between the mounting bracket 2 and the frame 1, and a second pressure plate 6 is fixedly connected to the output end of the second hydraulic cylinder 5. A connecting bracket 8 is connected to the side wall of the first hydraulic cylinder 3. A cavity is formed at the bottom of the connecting bracket 8, and a feedback mechanism is provided within the cavity. The feedback mechanism includes a push rod 16, a second spring 17, a push block 19, a guide block 20, a limit block 22, a locking block 24, and a fourth spring 30. The push rod 16... A connecting block 18 is fixedly connected to the push block 19, and the connecting block 18 is slidably connected in the cavity. The guide block 20 and the limiting block 22 are fixedly connected. The two ends of the fourth spring 30 are fixedly connected to the locking block 24 and the inner wall of the cavity, respectively. Through the coordinated action of the push block 19, the guide block 20, the limiting block 22, the locking block 24 and the fourth spring 30, the push rod 16 only needs to produce a small displacement to push the guide block 20 to drive the limiting block 22 to move, so as to release the limiting of the locking block 24. The locking block 24 moves downward with the help of the reset action of the fourth spring 30, so that the insulating plate 26 is inserted between the two metal blocks 27, disconnecting the circuit of the second hydraulic cylinder 5 and terminating the bending performance test of the crossbeam.

[0037] The support plate 7 is symmetrically provided with positioning posts 9. The positioning posts 9 have a connecting cavity, and the connecting cavity is provided with a positioning mechanism. The positioning mechanism includes a connecting rod 36, a stop block 37, a sixth spring 38, a mounting block 39, and multiple positioning rods 40. The connecting rod 36 is fixedly connected to the stop block 37, and the top of the connecting rod 36 is fixedly connected to the mounting block 39. The multiple positioning rods 40 are rotatably connected to the mounting block 39. When the connecting rod 36 moves down, it drives the stop block 37 to compress the sixth spring 38. The connecting rod 36 drives the multiple positioning rods 40 to rotate through the mounting block 39, so that the ends of the positioning rods 40 extend out of the positioning posts 9. At this time, the positioning posts 9 move down to position the bottom plate of the crossbeam, thereby realizing the fixed installation of the crossbeam.

[0038] Reference Figure 4 and Figure 10As shown, the top end of the push rod 16 slides through the top of the cavity. The second spring 17 is sleeved on the push rod 16, and the two ends of the second spring 17 are fixedly connected to the connecting block 18 and the inner wall of the cavity, respectively. The bottom of the connecting block 18 is fixedly connected to the push block 19. The guide block 20 and the locking block 24 are symmetrically fixed on both sides of the first slider 23 and the second slider 25, respectively. The first slider 23 and the second slider 25 are slidably connected to the side wall of the cavity. The guide block 20 is fixedly connected to the inner wall of the cavity. The first cylinder 29 is fixedly connected inside the cavity. The fourth spring 30 is sleeved on the first cylinder 29. Two elastic elements 28 are fixedly connected inside the cavity. Metal blocks 27 are fixedly connected to both elastic elements 28, and the two metal blocks 27 abut against each other. The bottom of the locking block 24 is symmetrically fixed with an insulating plate 26. The metal blocks 27 are electrically connected to the second hydraulic cylinder 5. When the two metal blocks 27 are separated, the circuit of the second hydraulic cylinder 5 is disconnected.

[0039] In use, when the crossbeam deforms or breaks during the strength testing phase at the connection point, the crossbeam will press against the top rod 16, causing the top rod 16 to displace slightly and squeeze the inclined surface of the guide block 20. The guide block 20 compresses the third spring 21 and drives the limiting block 22 to shift, releasing the limiting of the locking block 24. At this time, the stretched fourth spring 30 resets, pulling the locking block 24 downward, causing the insulating plate 26 at the bottom of the locking block 24 to insert between the two metal blocks 27, thereby disconnecting the circuit of the second hydraulic cylinder 5 and timely terminating the bending resistance of the crossbeam. In performance testing, it should be noted that the cross-sections of the guide block 20 and the limiting block 22 are both right-angled trapezoids. The inclined surface of the guide block 20 is set upward and is opposite to the push block 19. The inclined surface of the limiting block 22 is set downward and is opposite to the first cylinder 29. The side wall of the locking block 24 is provided with a protrusion with a cross-section of a right-angled triangle, and the inclined surface of the protrusion is parallel to the inclined surface of the limiting block 22. When the top of the limiting block 22 abuts against the bottom of the protrusion on the locking block 24, the limiting block 22 can restrict the locking block 24 from moving downward. At this time, the fourth spring 30 is in a stretched state.

[0040] Reference Figure 8 As shown, the side wall of the connecting frame 8 is provided with an installation groove, and two second metal balls 42 are provided in the installation groove. A movable block 43 is slidably connected in the installation groove, and a top block 45 is fixedly connected to the movable block 43. A seventh spring 44 is fixedly connected between the movable block 43 and the inner wall of the installation groove. One of the second metal balls 42 is fixedly connected to the movable block 43, and the other second metal ball 42 is fixedly connected in the installation groove. The second metal ball 42 is electrically connected to the first cylinder 29, and the two second metal balls 42 are connected in series in the circuit of the first cylinder 29.

[0041] In use, when the first hydraulic cylinder 3 drives the first pressure plate 4 to move upward and reset, the first pressure plate 4 pushes the top block 45 and the movable block 43 upward. The movable block 43 stretches the seventh spring 44 and drives the two second metal balls 42 to abut against each other. At this time, the first cylinder 29 is energized and started. The first cylinder 29 drives the locking block 24 to stretch the seventh spring 44 and move upward. During the upward movement, the inclined surface of the protrusion on the locking block 24 presses the inclined surface of the limiting block 22, causing the limiting block 22 to shift and compress the third spring 21. When the locking block 24 moves above the limiting block 22, the inclined surface of the protrusion on the locking block 24 no longer presses the inclined surface of the limiting block 22. The compressed third spring 21 resets and pushes the top of the limiting block 22 to abut against the bottom of the protrusion on the locking block 24, restricting the locking block 24 from moving downward. At this time, the two metal blocks 27 abut against each other. The circuit of the second hydraulic cylinder 5 is in a closed state. Starting the second hydraulic cylinder 5 can drive the second pressure plate 6 to move.

[0042] When the first hydraulic cylinder 3 moves the first pressure plate 4 downward, the compressed seventh spring 44 resets and pulls the movable block 43 downward, causing the two second metal balls 42 to separate. At this time, the first cylinder 29 is de-energized and resets. The first cylinder 29 is not connected to the locking block 24, and the locking block 24 remains in the above state, which facilitates feedback on the deformation and breakage of the crossbeam.

[0043] Reference Figure 6 and Figure 9 As shown, a partition plate 47 is fixedly connected inside the connecting cavity. A connecting rod 36 slides through the partition plate 47 and the bottom of the connecting cavity. Multiple cylindrical blocks 41 are provided above the partition plate 47, and the cylindrical blocks 41 are fixedly connected to the positioning post 9. A movable groove 46 is provided on the positioning rod 40, and the cylindrical blocks 41 are movably connected in the movable groove 46. A sixth spring 38 is sleeved on the connecting rod 36, and the two ends of the sixth spring 38 are fixedly connected to the stop block 37 and the inner wall of the connecting cavity, respectively. The positioning post 9 slides through the support plate 7. A U-shaped plate 10 is fixedly connected to the bottom of the support plate 7. A fixing block 31 is fixedly connected to the bottom of the positioning post 9. An annular rod 33 is fixedly connected to the bottom of the fixing block 31, and the bottom of the annular rod 33 slides through the U-shaped plate 10. A fifth spring 32 is sleeved on the annular rod 33, and the two ends of the fifth spring 32 are fixedly connected to the fixing block 31 and the U-shaped plate 10, respectively.

[0044] In use, the drive connecting rod 36 moves downward, causing the stop block 37 to compress the sixth spring 38. The connecting rod 36 drives multiple positioning rods 40 to rotate through the mounting block 39, causing the ends of the positioning rods 40 to extend out of the positioning post 9. When the mounting block 39 abuts against the partition plate 47, the downward-moving connecting rod 36 drives the positioning post 9 to move downward, compressing the fifth spring 32 through the fixing block 31. This causes the multiple positioning rods 40 extending out of the positioning post 9 to press against the bottom plate on the crossbeam, thereby fixing the crossbeam to the support plate 7 for easy inspection. It should be noted that the elasticity of the fifth spring 32 is greater than that of the sixth spring 38. When the connecting rod 36 is pulled down, the sixth spring 38 is compressed first. The fifth spring 32 is only compressed when the position of the connecting rod 36 cannot move downward relative to the positioning post 9. The purpose of this is to leave enough distance between the positioning rod 40 and the support plate 7, which can fix the bottom plate of the crossbeam with different thicknesses and has a wider range of applications.

[0045] Reference Figure 3 As shown, a second cylinder 35 is fixedly connected between the support plate 7 and the U-shaped plate 10. A fixed plate 34 is fixedly connected to the output end of the second cylinder 35. A connecting rod 36 passes through the annular rod 33 and is fixedly connected to the fixed plate 34. A cylindrical cavity 11 is opened in both the first pressure plate 4 and the second pressure plate 6. Two first metal balls 12 are provided in the cylindrical cavity 11. A first round rod 13 slides through the end of the cylindrical cavity 11, and one end of the first round rod 13 is fixedly connected to one of the first metal balls 12. The other end of the first round rod 13... A circular plate 15 is fixedly connected to one end, and another first metal ball 12 is fixedly connected to the connecting cavity. A first spring 14 is sleeved on the first circular rod 13, and the two ends of the first spring 14 are fixedly connected to the first metal ball 12 and the inner wall of the cylindrical cavity 11, respectively. The first metal ball 12 is electrically connected to the second cylinder 35, and the first metal ball 12 in the first pressure plate 4 and the second pressure plate 6 are connected in parallel in the circuit of the second cylinder 35. When any two first metal balls 12 in the cylindrical cavity 11 come into contact, the circuit of the second cylinder 35 will be closed.

[0046] When testing the connection strength or overall bending performance of the crossbeam, when the first pressure plate 4 or the second pressure plate 6 comes into contact with the crossbeam, it will squeeze the circular plate 15 and push the two first metal balls 12 into contact with each other. At this time, the circuit of the second cylinder 35 is closed, driving the second cylinder 35 to move the positioning rod 40 out of the positioning post 9, which can position the crossbeam. After the test is completed, the first pressure plate 4 or the second pressure plate 6 is reset, the two first metal balls 12 are separated, the circuit of the second cylinder 35 is disconnected, and the positioning rod 40 is reset and moved into the positioning post 9, releasing the positioning of the crossbeam, which facilitates quick disassembly and replacement of the crossbeam and improves the testing efficiency.

[0047] It should be noted that both the first cylinder 29 and the second cylinder 35 are press-fit single-acting cylinders. When air is supplied, the piston rod extends, and when air is cut off, the built-in spring automatically pushes the piston rod back. The structure is simple, and it can automatically reset without an external air source after power failure. The specific model and specifications of the first cylinder 29 and the second cylinder 35 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0048] In summary: During operation, the first hydraulic cylinder 3 is activated, causing the first pressure plate 4 to move downward, applying a vertical load to the connection point of the crossbeam. During this process, the circular plate 15 is compressed and moves upward, causing the two first metal balls 12 to abut against each other via the first circular rod 13. At this time, the circuit of the second cylinder 35 is closed, and the second cylinder 35 causes the connecting rod 36 to move downward, compressing the sixth spring 38 via the stop block 37. The connecting rod 36 drives multiple positioning rods 40 to rotate via the mounting block 39, causing the ends of the positioning rods 40 to extend out of the positioning post 9. When the mounting block 39 abuts against the partition plate 47, the downward-moving connecting rod 36 causes the positioning post 9 to move downward, compressing the fifth spring 32 via the fixing block 31, causing the multiple positioning rods 40 extending out of the positioning post 9 to press against the bottom plate on the crossbeam, thereby fixing the crossbeam on the support plate 7 for easy inspection.

[0049] During the testing process, if the crossbeam deforms or breaks during the connection point strength test stage, the crossbeam will press the top rod 16. After the top rod 16 undergoes a slight displacement, it pushes the guide block 20. The guide block 20 compresses the third spring 21 and causes the limiting block 22 to shift, releasing the limit on the locking block 24. At this time, the stretched fourth spring 30 resets and pulls the locking block 24 downward, so that the insulating plate 26 at the bottom of the locking block 24 is inserted between the two metal blocks 27, thereby disconnecting the circuit of the second hydraulic cylinder 5 and terminating the bending performance test of the crossbeam in time.

[0050] After the test is completed, the first hydraulic cylinder 3 drives the first pressure plate 4 to reset, the circular plate 15 is no longer squeezed, the two first metal balls 12 separate under the action of the first spring 14, the circuit of the second cylinder 35 is disconnected, at this time the compressed fifth spring 32 and sixth spring 38 drive the positioning column 9 and positioning rod 40 to reset respectively, and the positioning rod 40 releases the positioning of the crossbeam.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A strength testing device for connection points of automotive body structural components, comprising a frame (1) and mounting brackets (2) symmetrically fixed on the frame (1), characterized in that: A support plate (7) is slidably connected to the mounting bracket (2). A first hydraulic cylinder (3) is connected to the top of the frame (1), and a first pressure plate (4) is fixedly connected to the output end of the first hydraulic cylinder (3). A second hydraulic cylinder (5) is fixedly connected between the mounting bracket (2) and the frame (1), and a second pressure plate (6) is fixedly connected to the output end of the second hydraulic cylinder (5). A connecting bracket (8) is connected to the side wall of the first hydraulic cylinder (3), and a cavity is opened at the bottom of the connecting bracket (8). The device is equipped with a feedback mechanism, which includes a push rod (16), a second spring (17), a push block (19), a guide block (20), a limit block (22), a locking block (24), and a fourth spring (30). A connecting block (18) is fixedly connected between the push rod (16) and the push block (19), and the connecting block (18) is slidably connected in the cavity. The guide block (20) and the limit block (22) are fixedly connected. The two ends of the fourth spring (30) are fixedly connected to the locking block (24) and the inner wall of the cavity, respectively. The support plate (7) is symmetrically provided with positioning posts (9), and the positioning posts (9) are provided with connecting cavities, and the connecting cavities are provided with positioning mechanisms. The positioning mechanism includes a connecting rod (36), a stop block (37), a sixth spring (38), a mounting block (39) and multiple positioning rods (40). The connecting rod (36) is fixedly connected to the stop block (37), and the top of the connecting rod (36) is fixedly connected to the mounting block (39). The multiple positioning rods (40) are rotatably connected to the mounting block (39). A first cylinder (29) is fixedly connected inside the cavity. A fourth spring (30) is sleeved on the first cylinder (29). Two elastic elements (28) are fixedly connected inside the cavity. A metal block (27) is fixedly connected to each of the two elastic elements (28), and the two metal blocks (27) abut against each other. The metal blocks (27) are electrically connected to the second hydraulic cylinder (5). An insulating plate (26) is symmetrically fixed to the bottom of the locking block (24). The positioning column (9) slides through the support plate (7), and a U-shaped plate (10) is fixedly connected to the bottom of the support plate (7). A second cylinder (35) is fixedly connected between the support plate (7) and the U-shaped plate (10). A fixed plate (34) is fixedly connected to the output end of the second cylinder (35). The connecting rod (36) passes through the ring rod (33) and is fixedly connected to the fixed plate (34).

2. The device for testing the strength of connection points of automotive body structural components according to claim 1, characterized in that: The top end of the push rod (16) slides through the top of the cavity. The second spring (17) is sleeved on the push rod (16), and the two ends of the second spring (17) are fixedly connected to the connecting block (18) and the inner wall of the cavity, respectively. The bottom of the connecting block (18) is fixedly connected to the push block (19). The guide block (20) and the locking block (24) are symmetrically fixed with the first slider (23) and the second slider (25) on both sides, respectively. The first slider (23) and the second slider (25) are slidably connected to the side wall of the cavity. The guide block (20) is fixedly connected to the inner wall of the cavity with the third spring (21).

3. The device for testing the strength of connection points of automotive body structural components according to claim 1, characterized in that: A partition (47) is fixedly connected inside the connecting cavity. The connecting rod (36) slides through the partition (47) and the bottom of the connecting cavity. Multiple cylindrical blocks (41) are provided above the partition (47), and the cylindrical blocks (41) are fixedly connected to the positioning post (9). The positioning rod (40) has a movable groove (46), and the cylindrical blocks (41) are movably connected in the movable groove (46). The sixth spring (38) is sleeved on the connecting rod (36), and the two ends of the sixth spring (38) are fixedly connected to the stop block (37) and the inner wall of the connecting cavity, respectively.

4. The device for testing the strength of connection points of automotive body structural components according to claim 3, characterized in that: The bottom of the positioning column (9) is fixedly connected to a fixing block (31), and the bottom of the fixing block (31) is fixedly connected to a ring rod (33). The bottom of the ring rod (33) slides through the U-shaped plate (10). A fifth spring (32) is sleeved on the ring rod (33), and the two ends of the fifth spring (32) are fixedly connected to the fixing block (31) and the U-shaped plate (10) respectively.

5. The device for testing the strength of connection points of automotive body structural components according to claim 1, characterized in that: The first pressure plate (4) and the second pressure plate (6) are both provided with cylindrical cavities (11). Two first metal balls (12) are provided in the cylindrical cavity (11). A first round rod (13) slides through the end of the cylindrical cavity (11). One end of the first round rod (13) is fixedly connected to one of the first metal balls (12). The other end of the first round rod (13) is fixedly connected to a round plate (15). The other first metal ball (12) is fixedly connected in the connecting cavity. A first spring (14) is sleeved on the first round rod (13). The two ends of the first spring (14) are fixedly connected to the first metal ball (12) and the inner wall of the cylindrical cavity (11), respectively.

6. The device for testing the strength of connection points of automotive body structural components according to claim 5, characterized in that: The first metal ball (12) is electrically connected to the second cylinder (35), and the first metal ball (12) in the first pressure plate (4) and the second pressure plate (6) is connected in parallel in the circuit of the second cylinder (35).

7. The device for testing the strength of connection points of automotive body structural components according to claim 1, characterized in that: The side wall of the connecting frame (8) is provided with an installation groove, and two second metal balls (42) are provided in the installation groove. A movable block (43) is slidably connected in the installation groove, and a top block (45) is fixedly connected on the movable block (43). A seventh spring (44) is fixedly connected between the movable block (43) and the inner wall of the installation groove. One of the second metal balls (42) is fixedly connected to the movable block (43), and the other second metal ball (42) is fixedly connected in the installation groove.

8. The device for testing the strength of connection points of automotive body structural components according to claim 7, characterized in that: The second metal ball (42) is electrically connected to the first cylinder (29), and the two second metal balls (42) are connected in series in the circuit of the first cylinder (29).

Images