Device for detecting strength of connecting point of structural member of automobile body

Abstract

The invention discloses an automobile body structural member connection point strength detection device, and belongs to the technical field of automobile body structural member detection, the automobile body structural member connection point strength detection device comprises a rack and mounting racks symmetrically fixed on the rack, the mounting racks are slidably connected with a supporting plate, the top of the rack is connected with a first hydraulic cylinder, and the top of the first hydraulic cylinder is connected with a second hydraulic cylinder; a first pressing plate is fixedly connected to the output end of the first hydraulic cylinder; through the synergistic effect of a push block, a guide block, a limiting block, a clamping block and a fourth spring, when a cross beam deforms or breaks in the connecting point strength detection process, the cross beam presses an ejector rod, the ejector rod only needs to generate tiny displacement, the guide block is pushed to drive the limiting block to move, limiting on the clamping block can be relieved, and at the moment, the clamping block is not prone to deformation or breakage. And the stretched fourth spring is reset to pull the clamping block to move downwards, so that an insulating plate at the bottom of the clamping block is inserted between the two metal blocks, a circuit of the second hydraulic cylinder is disconnected, the bending resistance detection of the cross beam is terminated, and unnecessary extra workload is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile body structural component detection, in particular to a device for detecting the strength of connection points of automobile body structural components. Background Art

[0002] The automobile body is composed of a rigid spatial skeleton welded together by longitudinal beams, cross beams and pillars, which supports all parts of the vehicle. Anti-collision beams, as a type of cross beam, are installed at the front and rear ends of the vehicle body. They are mainly used to absorb energy and protect body parts during medium and low-speed collisions. As a key component, the cross beam must be tested for compressive performance 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 fixes the two ends of the anti-collision beam and applies a vertical load at the connection point to measure its deformation, yield strength and fracture point, thereby detecting the connection strength of the cross beam connection point.

[0003] Upon investigation, a Chinese invention patent discloses a beam reinforcement plate resistance strength detector for automobile parts processing (publication number: CN116558967B), which includes a frame, an electric slide rail and a strength detector. The left and right sides of the frame are connected with electric slide rails, and the electric slide rails are connected with a strength detector through a slider. It also includes a positioning mechanism and an insertion mechanism. A positioning mechanism for pushing the beam for positioning and correction is provided between the frame and the slider of the electric slide rail. An insertion mechanism for limiting the position of the beam is provided in the middle of the frame. The beam is placed in the middle of the frame, and the insertion mechanism is inserted into the hole of the beam to limit the position of the beam. The simulated beam is installed on the car, and the compressive performance of the beam is tested by the strength detector.

[0004] Although the aforementioned patent employs an insertion rod inserted into the hole of the crossbeam to limit the crossbeam's position and simulate the crossbeam being installed on a vehicle, thus simulating the compressive performance test of the crossbeam when installed on a vehicle and improving accuracy, the crossbeam testing requires not only applying a vertical load to test the strength of the crossbeam's connection points, but also evaluating the overall bending performance of the crossbeam to ensure it meets crashworthiness requirements. However, current devices do not have the ability to test the overall bending performance of the crossbeam. Conventional testing methods typically test the strength of the crossbeam's connection points and the overall bending performance separately. This not only requires the addition of expensive independent testing equipment, but also requires workers to place the crossbeam on different testing equipment one by one for testing, a cumbersome, time-consuming, and labor-intensive process. If the connection point testing and overall bending performance testing are to be combined, it is necessary to ensure that the crossbeam does not deform or break after the connection point strength test. Once the beam deforms or breaks, the conditions for bending performance testing are no longer met, and further testing would only unnecessarily increase the workload.

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

[0006] (1) Technical problems solved The present invention provides a device for detecting the strength of connection points of automobile body structural parts, aiming to solve the problems raised in the background art.

[0007] (2) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solution: it comprises a frame and a mounting frame symmetrically fixed on the frame, the mounting frame is slidably connected to a support plate, the top of the frame is connected to a first hydraulic cylinder, and the output end of the first hydraulic cylinder is fixedly connected to a first pressure plate, the mounting frame is fixedly connected to the frame, and the output end of the second hydraulic cylinder is fixedly connected to the second pressure plate, the side wall of the first hydraulic cylinder is connected to a connecting frame, the bottom of the connecting frame is provided with a cavity, and a feedback mechanism is provided in the cavity, the feedback mechanism comprises a push rod, a second spring, a push block, a guide block, a limit block, a clamping block and a fourth spring, a connecting block is fixedly connected between the push rod and the push block, and the connecting block is slidably connected in the cavity, the guide block and the limit block are fixedly connected, and two ends of the fourth spring are fixedly connected to the clamping block and the inner wall of the cavity respectively; The support plate is symmetrically provided with positioning columns, a connecting cavity is opened in the positioning columns, and a positioning mechanism is provided in the connecting cavity, the positioning mechanism includes a connecting rod, a block, a sixth spring, a mounting block and multiple positioning rods, the connecting rod is fixedly connected to the 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.

[0008] As a preferred technical solution of the present 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, the bottom of the connecting block is fixedly connected to the push block, and the first slider and the second slider are symmetrically fixed on both sides of the guide block and the clamping block, the first slider and the second slider are both slidably connected to the side wall of the cavity, and the third spring is fixedly connected between the guide block and the inner wall of the cavity.

[0009] As a preferred technical solution of the present application, a first cylinder is fixedly connected in the cavity, the fourth spring is sleeved on the first cylinder, two elastic parts are fixedly connected in the cavity, metal blocks are fixedly connected to the two elastic parts, and the two metal blocks are offset from each other, and an insulating plate is symmetrically fixed to the bottom of the block.

[0010] As a preferred technical solution of the present application, a partition is fixedly connected in the connecting cavity, the connecting rod slides through the partition and the bottom of the connecting cavity, a plurality of column blocks are provided above the partition, and the column blocks are fixedly connected to the positioning columns, a movable groove is provided on the positioning rod, and the column 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 respectively fixedly connected to the block and the inner wall of the connecting cavity.

[0011] As a preferred technical solution of the present application, the positioning column slides through the support plate, the bottom of the support plate is fixedly connected to a U-shaped plate, the bottom of the positioning column is fixedly connected to a fixed block, the bottom of the fixed block is fixedly connected to an annular rod, and the bottom of the annular rod slides through the U-shaped plate, a fifth spring is sleeved on the annular rod, and the two ends of the fifth spring are fixedly connected to the fixed block and the U-shaped plate respectively.

[0012] As a preferred technical solution of the present 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.

[0013] As a preferred technical solution of the present application, a cylindrical cavity is provided in each of the first pressure plate and the second pressure plate, two first metal balls are provided in the cylindrical cavity, a first round rod is slidably passed 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, the other end of the first round rod is fixedly connected to a circular plate, and 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 respectively fixedly connected to the first metal ball and the inner wall of the cylindrical cavity.

[0014] As a preferred technical solution of the present application, the first metal ball is electrically connected to the second cylinder, and the first metal balls in the first pressure plate and the second pressure plate are connected in parallel in the circuit of the second cylinder.

[0015] As a preferred technical solution of the present application, a mounting groove is provided in the side wall of the connecting frame, two second metal balls are provided in the mounting groove, a movable block is slidably connected in the mounting 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 mounting 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 mounting groove.

[0016] As a preferred technical solution of the present 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.

[0017] (3) Beneficial effects 1. By setting the synergistic effect of the push block, guide block, limit block, clamping block and the fourth spring, when the beam is deformed or broken during the connection point strength test, the beam will press the push rod. The push rod only needs to produce a slight displacement to push the guide block to drive the limit block to shift, thereby releasing the limit on the clamping block. At this time, the stretched fourth spring resets, pulling the clamping block downward, so that the insulating plate at the bottom of the clamping 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 beam, effectively avoiding unnecessary extra workload.

[0018] 2. By setting up multiple parallel first metal balls to control the start and stop of the second cylinder, when the beam is undergoing connection point strength or bending performance testing, once the first pressure plate or the second pressure plate collides with the beam, it will squeeze the circular plate to 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 beam. After the test is completed, the first pressure plate or the second pressure plate is reset, the two first metal balls are separated, and the second cylinder circuit is disconnected, thereby releasing the positioning of the beam by the positioning rod, facilitating rapid disassembly and replacement of the beam, and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The following is a schematic diagram of a device for detecting the strength of connection points of automobile body structural parts; Figure 2 This is a structural cross-sectional view of a device for detecting the strength of connection points of automobile body structural parts; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of point B in the middle; Figure 5 This is a diagram of the internal structure of a device for detecting the strength of connection points of automobile body structural parts; Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 This is a right side cross-sectional view of a device for detecting the strength of connection points of automobile body structural parts; Figure 8 for Figure 7 Enlarged view of point D in the middle; Figure 9 for Figure 7 Enlarged view of point E in the middle; Figure 10 for Figure 7 Enlarged view of point F in the middle.

[0020] In the picture: 1. Frame; 2. Mounting frame; 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. Limit block; 23. First slider; 24. Clamping block 25. Second slider; 26. Insulating plate; 27. Metal block; 28. Elastic member; 29. ​​First cylinder; 30. Fourth spring; 31. Fixed block; 32. Fifth spring; 33. Annular rod; 34. Fixed plate; 35. Second cylinder; 36. Connecting rod; 37. Stop block; 38. Sixth spring; 39. Mounting block; 40. Positioning rod; 41. Columnar block; 42. Second metal ball; 43. Movable block; 44. Seventh spring; 45. Top block; 46. Movable groove; 47. Partition. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The present invention provides a device for detecting the strength of connection points of automobile body structural parts. Figures 1-10As shown, the technical solution includes a frame 1 and a mounting frame 2 symmetrically fixed on the frame 1, a support plate 7 is slidably connected to the mounting frame 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 frame 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 frame 8 is connected to the side wall of the first hydraulic cylinder 3, a cavity is opened at the bottom of the connecting frame 8, and a feedback mechanism is provided in 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 card 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 limit block 22 are fixedly connected. The two ends of the fourth spring 30 are respectively fixedly connected to the clamping block 24 and the inner wall of the cavity. Through the coordinated action of the push block 19, the guide block 20, the limit block 22, the clamping block 24 and the fourth spring 30, the push rod 16 only needs to produce a slight displacement to push the guide block 20 to drive the limit block 22 to shift, thereby releasing the limit on the clamping block 24. The clamping 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 resistance test of the beam; The support plate 7 is symmetrically provided with positioning columns 9, a connecting cavity is opened in the positioning column 9, and a positioning mechanism is provided in the connecting cavity. The positioning mechanism includes a connecting rod 36, a stopper 37, a sixth spring 38, a mounting block 39 and a plurality of positioning rods 40. The connecting rod 36 is fixedly connected to the stopper 37, and the top of the connecting rod 36 is fixedly connected to the mounting block 39. The plurality of positioning rods 40 are rotatably connected to the mounting block 39. When the connecting rod 36 moves downward and drives the stopper 37 to compress the sixth spring 38, the connecting rod 36 drives the plurality of positioning rods 40 to rotate through the mounting block 39, so that the end of the positioning rod 40 extends from the positioning column 9. At this time, the positioning column 9 moves downward to position the bottom plate of the beam, thereby realizing fixed installation of the beam.

[0023] 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, and the bottom of the connecting block 18 is fixedly connected to the push block 19. The first slider 23 and the second slider 25 are symmetrically fixed on both sides of the guide block 20 and the clamping block 24, respectively. The first slider 23 and the second slider 25 are both slidably connected to the side wall of the cavity, and a third spring 21 is fixedly connected between the guide block 20 and the inner wall of the cavity. A first cylinder 29 is fixedly connected in the cavity, and a fourth spring 30 is sleeved on the first cylinder 29. Two elastic members 28 are fixedly connected in the cavity, and a metal block 27 is fixedly connected to the two elastic members 28, and the two metal blocks 27 are against each other. An insulating plate 26 is symmetrically fixed to the bottom of the clamping block 24, and the metal block 27 is 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. During use, when the crossbeam is deformed or broken during the connection point strength test phase, the crossbeam will press the push rod 16, causing the push rod 16 to produce a slight displacement and squeeze the inclined surface of the guide block 20. The guide block 20 compresses the third spring 21 and drives the limit block 22 to shift, releasing the limit on the card block 24. At this time, the stretched fourth spring 30 is reset, pulling the card block 24 downward, so that the insulating plate 26 at the bottom of the card block 24 is inserted between the two metal blocks 27, thereby disconnecting the circuit of the second hydraulic cylinder 5 and promptly terminating the anti-bending of the crossbeam. Performance test, it should be noted that the cross-sections of the guide block 20 and the limit block 22 are both right-angled trapezoids, the inclined surface of the guide block 20 is set upward and opposite to the push block 19, the inclined surface of the limit block 22 is set downward and opposite to the first cylinder 29, and the side wall of the clamping block 24 is provided with a protrusion with a right-angled triangle cross-section, and the inclined surface of the protrusion is parallel to the inclined surface of the limit block 22. When the top end of the limit block 22 is against the bottom end of the protrusion on the clamping block 24, the limit block 22 can limit the downward movement of the clamping block 24. At this time, the fourth spring 30 is in a stretched state.

[0024] Reference Figure 8 As shown, a mounting groove is defined in the side wall of the connecting frame 8, in which two second metal balls 42 are disposed. A movable block 43 is slidably connected in the mounting 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 mounting 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 mounting groove. The second metal balls 42 are 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. When in use, when the first hydraulic cylinder 3 drives the first pressure plate 4 to move up and reset, the first pressure plate 4 pushes the top block 45 and the movable block 43 to move up, the movable block 43 stretches the seventh spring 44 and drives the two second metal balls 42 to resist each other. At this time, the first cylinder 29 is energized and started, and the first cylinder 29 drives the clamping block 24 to stretch the seventh spring 44 and move up. During the upward movement, the inclined surface of the protrusion on the clamping block 24 squeezes the inclined surface of the limit block 22, so that the limit block 22 shifts and compresses the third spring 21. When the clamping block 24 moves to the top of the limit block 22, the inclined surface of the protrusion on the clamping block 24 no longer squeezes the inclined surface of the limit block 22, and the compressed third spring 21 resets and pushes the top end of the limit block 22 to resist the bottom end of the protrusion on the clamping block 24, limiting the clamping block 24 from moving down. At this time, the two metal blocks 27 resist each other, and 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; When the first hydraulic cylinder 3 drives the first pressure plate 4 to move downward, the compressed seventh spring 44 resets and pulls the movable block 43 downward, so that the two second metal balls 42 are separated. At this time, the first cylinder 29 is powered off and reset. The first cylinder 29 is not connected to the block 24, and the block 24 still maintains the above state, which is convenient for feedback on the deformation and fracture of the beam.

[0025] Reference Figure 6 and Figure 9 As shown, a partition 47 is fixedly connected in the connecting cavity, and the connecting rod 36 slides through the partition 47 and the bottom of the connecting cavity. A plurality of column blocks 41 are provided above the partition 47, and the column blocks 41 are fixedly connected to the positioning column 9. A movable groove 46 is provided on the positioning rod 40, and the column block 41 is 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 respectively fixedly connected to the stop block 37 and the inner wall of the connecting cavity. The positioning column 9 slides through the support plate 7, and the bottom of the support plate 7 is fixedly connected to the U-shaped plate 10. The bottom of the positioning column 9 is fixedly connected to the fixed block 31, and the bottom of the fixed block 31 is fixedly connected to the annular rod 33, and the bottom of the annular rod 33 slides through the U-shaped plate 10. The annular rod 33 is sleeved with a fifth spring 32, and the two ends of the fifth spring 32 are respectively fixedly connected to the fixed block 31 and the U-shaped plate 10.

[0026] When the mounting block 39 abuts against the partition plate 47, the downwardly moving connecting rod 36 drives the positioning post 9 to move downward, compressing the fifth spring 32 through the fixing block 31, so that the multiple positioning rods 40 extending from the positioning post 9 squeeze the bottom plate on the cross beam, thereby fixing the cross beam on the support plate 7 for easy detection. It should be noted that the elasticity of the fifth spring 32 is greater than the sixth spring 38. When the connecting rod 36 is pulled down, the sixth spring 38 is compressed first. When the position of the connecting rod 36 cannot be moved downward relative to the positioning post 9, the fifth spring 32 is compressed. The purpose is to reserve a sufficient distance between the positioning rod 40 and the support plate 7. It can fix the bottom plates of cross beams of different thickness specifications, and has a wider range of applications.

[0027] 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 each of the first pressing plate 4 and the second pressing plate 6, two first metal balls 12 are provided in the cylindrical cavity 11, a first round rod 13 is slidably passed 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, and the other end of the first round rod 13 is fixedly connected to one of the first metal balls 12. The first end of the cylindrical cavity 11 is fixedly connected to a circular plate 15, and another first metal ball 12 is fixedly connected to the connecting cavity. The first round rod 13 is sleeved with a first spring 14, and the two ends of the first spring 14 are respectively fixedly connected to the first metal ball 12 and the inner wall of the cylindrical cavity 11. The first metal ball 12 is electrically connected to the second cylinder 35, and the first metal balls 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 the two first metal balls 12 in any cylindrical cavity 11 touch, the circuit of the second cylinder 35 will be closed. During use, when testing the connection point strength or overall bending resistance of the beam, when the first pressure plate 4 or the second pressure plate 6 contacts the beam, it will squeeze the circular plate 15 and push the two first metal balls 12 to contact each other. At this time, the circuit of the second cylinder 35 is closed, driving the second cylinder 35 to drive the positioning rod 40 to move out of the positioning column 9, so that the beam can be positioned. 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, and the circuit of the second cylinder 35 is disconnected. At this time, the positioning rod 40 is reset and moved into the positioning column 9, releasing the positioning of the beam, facilitating rapid disassembly and replacement of the beam, and improving the test efficiency. It should be noted that the first cylinder 29 and the second cylinder 35 are both press-in single-acting cylinders. When the air is ventilated, the piston rod extends, and when the air is cut off, the built-in spring automatically pushes the piston rod to retract. The structure is simple, and it can automatically reset after power failure without an external air source. The specific model 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.

[0028] In summary: when working, the first hydraulic cylinder 3 is started to drive the first pressure plate 4 to move downward, applying a vertical load to the connection point of the beam. During this process, the circular plate 15 is squeezed and moved upward, and the two first metal balls 12 are driven to resist each other through the first round rod 13. At this time, the circuit of the second cylinder 35 is closed, and the second cylinder 35 drives the connecting rod 36 to move downward, compressing the sixth spring 38 through the stop block 37. The connecting rod 36 drives the multiple positioning rods 40 to rotate through the mounting block 39, so that the end of the positioning rod 40 extends from the positioning column 9. When the mounting block 39 is against the partition 47, the downward-moving connecting rod 36 drives the positioning column 9 to move downward, and compresses the fifth spring 32 through the fixing block 31, so that the multiple positioning rods 40 extending from the positioning column 9 squeeze the bottom plate on the beam, thereby fixing the beam on the support plate 7, which is convenient for its detection. During the test, if the crossbeam deforms or breaks during the connection point strength test, the crossbeam will press the push rod 16. The push rod 16 will produce a slight displacement and push the guide block 20. The guide block 20 compresses the third spring 21 and drives the limit block 22 to shift, releasing the limit on the clamping block 24. At this time, the stretched fourth spring 30 resets, pulling the clamping block 24 downward, so that the insulating plate 26 at the bottom of the clamping block 24 is inserted between the two metal blocks 27, thereby disconnecting the circuit of the second hydraulic cylinder 5 and promptly terminating the bending performance test of the crossbeam. After the detection 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, and the circuit of the second cylinder 35 is disconnected. At this time, the compressed fifth spring 32 and the sixth spring 38 respectively drive the positioning column 9 and the positioning rod 40 to reset, and the positioning rod 40 releases the positioning of the beam.

[0029] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for detecting the strength of connection points of automobile body structural parts, comprising a frame (1) and a mounting frame (2) symmetrically fixed to the frame (1), characterized in that: A support plate (7) is slidably connected to the mounting frame (2), a first hydraulic cylinder (3) is connected to the top of the frame (1), and a first pressing 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 frame (2) and the frame (1), and a second pressing plate (6) is fixedly connected to the output end of the second hydraulic cylinder (5), a connecting frame (8) is connected to the side wall of the first hydraulic cylinder (3), and a cavity is provided at the bottom of the connecting frame (8), and the cavity A feedback mechanism is provided inside, the feedback mechanism comprising a push rod (16), a second spring (17), a push block (19), a guide block (20), a limit block (22), a clamping block (24) and a fourth spring (30), a connecting block (18) being fixedly connected between the push rod (16) and the push block (19), and the connecting block (18) being slidably connected in the cavity, the guide block (20) and the limit block (22) being fixedly connected, and two ends of the fourth spring (30) being fixedly connected to the clamping block (24) and the inner wall of the cavity respectively; The support plate (7) is symmetrically provided with positioning columns (9), a connecting cavity is opened in the positioning columns (9), and a positioning mechanism is provided in the connecting cavity, the positioning mechanism comprises a connecting rod (36), a stopper (37), a sixth spring (38), a mounting block (39) and a plurality of positioning rods (40), the connecting rod (36) is fixedly connected to the stopper (37), the top of the connecting rod (36) is fixedly connected to the mounting block (39), and the plurality of positioning rods (40) are all rotatably connected to the mounting block (39).

2. The device for detecting the strength of connection points of automobile body structural parts 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 two sides of the guide block (20) and the clamping block (24) are symmetrically fixed with a first slider (23) and a second slider (25), the first slider (23) and the second slider (25) are both slidably connected to the side wall of the cavity, and a third spring (21) is fixedly connected between the guide block (20) and the inner wall of the cavity.

3. The device for detecting the strength of connection points of automobile body structural parts according to claim 2, characterized in that: A first cylinder (29) is fixedly connected in the cavity, and the fourth spring (30) is sleeved on the first cylinder (29). Two elastic members (28) are fixedly connected in the cavity, and metal blocks (27) are fixedly connected to the two elastic members (28), and the two metal blocks (27) are opposed to each other. An insulating plate (26) is symmetrically fixed to the bottom of the clamping block (24).

4. The device for detecting the strength of connection points of automobile body structural parts according to claim 1, characterized in that: A partition (47) is fixedly connected in the connecting cavity, and the connecting rod (36) slides through the partition (47) and the bottom of the connecting cavity. A plurality of columnar blocks (41) are provided above the partition (47), and the columnar blocks (41) are fixedly connected to the positioning column (9). A movable groove (46) is provided on the positioning rod (40), and the columnar 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.

5. The device for detecting the strength of connection points of automobile body structural parts according to claim 4, characterized in that: The positioning column (9) slides through the support plate (7), the bottom of the support plate (7) is fixedly connected to the U-shaped plate (10), the bottom of the positioning column (9) is fixedly connected to the fixed block (31), the bottom of the fixed block (31) is fixedly connected to the annular rod (33), 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 fixed block (31) and the U-shaped plate (10), respectively.

6. The device for detecting the strength of connection points of automobile body structural parts according to claim 5, characterized in that: 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), and the connecting rod (36) passes through the annular rod (33) and is fixedly connected to the fixed plate (34).

7. The device for detecting the strength of connection points of automobile body structural parts according to claim 6, characterized in that: A cylindrical cavity (11) is provided in each of the first pressing plate (4) and the second pressing plate (6), two first metal balls (12) are provided in the cylindrical cavity (11), a first round rod (13) is slidably passed 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) is fixedly connected to a circular plate (15), and 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), 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.

8. The device for detecting the strength of connection points of automobile body structural parts according to claim 7, characterized in that: The first metal ball (12) is electrically connected to the second cylinder (35), and the first metal balls (12) in the first pressing plate (4) and the second pressing plate (6) are connected in parallel in the circuit of the second cylinder (35).

9. The device for detecting the strength of connection points of automobile body structural parts according to claim 3, characterized in that: A mounting groove is provided in the side wall of the connecting frame (8), two second metal balls (42) are provided in the mounting groove, a movable block (43) is slidably connected in the mounting 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 mounting 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 mounting groove.

10. The device for detecting the strength of connection points of automobile body structural parts according to claim 9, 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).

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