An impact resistance testing device for automobile bumpers and an intelligent induction testing method thereof

Abstract

The application relates to the technical field of impact detection, in particular to an anti-impact test device for automobile bumpers and an intelligent induction test method thereof, which comprises a guide rail, one end of the guide rail is provided with an impact part, the other end is provided with an electromagnetic ejection device, a profiled bumper is arranged on the impact part; an experimental trolley is arranged on the guide rail, the electromagnetic ejection device can drive the experimental trolley to move towards the impact part; a connecting plate is connected with the experimental trolley, the connecting plate is provided with an elastic loading structure, a to-be-detected bumper is detachably arranged on the elastic loading structure, the to-be-detected bumper is provided with an intelligent sensor module; a locking structure is connected with the elastic loading structure, the locking structure is provided with a convex shaft; a locking piece is connected with a linear driving module arranged on the connecting plate, a plurality of groups of sawtooth parts matched with the convex shaft are symmetrically arranged on the two sides of the locking piece, so that secondary collision is prevented, and errors in detection results are avoided.

Description

Technical Field

[0001] This invention relates to the field of impact testing technology, specifically to an impact resistance testing device for automobile bumpers and its intelligent sensing testing method. Background Technology

[0002] The impact resistance of car bumpers is an important indicator for evaluating the passive safety of vehicles. Existing impact resistance testing devices mostly adopt moving barrier or pendulum structure, which rigidly fix the bumper to be tested on the test trolley or test bench, and obtain its mechanical response by having an impactor collide head-on with the bumper.

[0003] However, in actual traffic accidents, when a vehicle is subjected to an offset collision or an oblique impact, the bumper not only bears the frontal impact force, but also tends to slide laterally along the vehicle body. The relative displacement between the bumper and the vehicle body connection will occur, thereby dispersing and absorbing some of the impact energy.

[0004] Existing testing equipment, by rigidly locking the bumper, cannot simulate this lateral displacement phenomenon. As a result, the lateral force generated during the collision cannot be released and is entirely converted into local stress in the bumper structure. This makes the test results too stringent and different from the stress state under actual working conditions, affecting the authenticity and reliability of the test data. Summary of the Invention

[0005] The purpose of this invention is to provide an impact resistance testing device for automobile bumpers and its intelligent sensing testing method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An impact resistance testing device for automobile bumpers, comprising:

[0008] The guide rail has an impact part at one end and an electromagnetic catapult at the other end, with a contoured bumper on the impact part.

[0009] An experimental trolley is mounted on the guide rail, and the electromagnetic catapult can drive the experimental trolley toward the impact point.

[0010] A connecting plate is connected to the experimental trolley. The connecting plate is equipped with an elastic loading structure. A bumper to be tested is detachably installed on the elastic loading structure. The bumper to be tested has a built-in intelligent sensor module.

[0011] A locking structure is connected to the elastic loading structure, and a convex shaft is provided on the locking structure;

[0012] A locking component is connected to a linear drive module mounted on the connecting plate. The locking component has multiple sets of serrated portions on both sides that are adapted to the cam shaft.

[0013] The impact resistance testing device for automobile bumpers as described above: the elastic loading structure includes a sliding frame that can slide horizontally relative to the connecting plate, and the sliding frame is connected to the bumper to be tested and the locking structure;

[0014] The elastic loading structure also includes a first spring telescopic rod symmetrically arranged on both sides of the connecting plate, and the actuating end of the first spring telescopic rod is connected to the sliding frame.

[0015] The impact resistance testing device for automobile bumpers as described above: the locking structure includes a follower connected to the sliding frame, the follower has a hollow structure inside, and a cylindrical spring and a telescopic shaft are provided inside the follower, the telescopic shaft passes through the follower and extends to the outside;

[0016] The convex shaft is rotatably connected to the end of the telescopic shaft away from the cylindrical spring.

[0017] The impact resistance testing device for car bumpers as described above: the serrated part includes an inclined surface and a vertical surface provided on the locking member. When the bumper to be tested is laterally displaced after impact, the convex shaft can move from the inclined surface toward the vertical surface.

[0018] The impact resistance testing device for car bumpers as described above also includes:

[0019] A lateral adjustment device is provided inside the impact part, and a follower frame that can slide along the length direction of the impact part is connected to the lateral adjustment device. The follower frame is connected to the rotating shaft of the contoured bumper.

[0020] A drive motor is mounted on the follower frame, and the drive motor is connected to the rotating shaft of the contoured bumper through a gear set;

[0021] The follower disc is coaxially connected to the rotating shaft of the contoured bumper;

[0022] A plug-in structure is provided on the follower frame, and the plug-in structure can lock the follower disk;

[0023] A differential structure connects the follower frame and the plug-in structure. The differential structure enables the plug-in structure to abut against the follower disk when the follower disk rotates at a predetermined angle.

[0024] The impact resistance testing device for automobile bumpers as described above: the insertion and removal structure includes multiple sets of locking grooves arranged circumferentially and equidistantly on the follower plate, and a guide slope is provided on the upper part of the side wall of the locking groove.

[0025] The impact resistance testing device for car bumpers as described above: the insertion and removal structure also includes multiple sets of second spring telescopic rods installed on the follower frame, the moving end of the second spring telescopic rod is connected to a lifting frame, and multiple sets of locking shafts that can be inserted into the locking groove are arranged circumferentially on the lifting frame;

[0026] The lifting frame is also connected to a connecting shaft that passes through the follower frame. The connecting shaft is provided with a limit groove along its length direction. The limit groove is slidably connected to a limit block provided on the follower frame.

[0027] The impact resistance testing device for automobile bumpers as described above: the differential structure includes an electric telescopic rod mounted on the follower frame, and the actuating end of the electric telescopic rod is slidably connected to the lifting frame;

[0028] The end of the electric telescopic pole is also provided with an annular abutment.

[0029] A smart sensing test method using the aforementioned automotive bumper impact resistance testing device includes the following steps:

[0030] Step 1: Install the smart sensor module onto the bumper to be tested, and then install the bumper to be tested onto the connecting plate;

[0031] Step 2: Adjust the position and angle of the contoured bumper;

[0032] Step 3: The experimental trolley is propelled toward the impact point using an electromagnetic catapult.

[0033] Step 4: When the contoured bumper collides with the bumper to be tested, the force on the bumper to be tested is obtained through the intelligent sensor module.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] By using the connecting plate, locking structure and locking components, the system firstly enables the bumper under test to move laterally when it collides with the contoured bumper. This is more consistent with the actual collision scenario of the bumper under test, allowing the lateral force to be released. This avoids discrepancies between the impact resistance test results and the actual impact resistance test results due to the inability to release the lateral force in time, thus improving the testing accuracy.

[0036] Secondly, when the bumper under test collides with the contoured bumper and causes lateral movement, the vertical surface can stop the convex shaft, thereby preventing the bumper under test from returning to its original position under the restoring force of the first spring telescopic rod and impacting the contoured bumper a second time, effectively avoiding additional damage to the bumper under test caused by secondary collision. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the impact resistance testing device for automobile bumpers.

[0038] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle.

[0039] Figure 3 This is a schematic diagram of the impact resistance testing device for a car bumper from another angle.

[0040] Figure 4 This is a schematic diagram of the structure of the experimental trolley and the bumper to be tested in the impact resistance testing device for automobile bumpers.

[0041] Figure 5 This is a schematic diagram of the connecting plate, locking structure, and locking components in the impact resistance testing device for automobile bumpers.

[0042] Figure 6 This is a schematic diagram of the locking structure and locking components in an impact resistance testing device for automobile bumpers.

[0043] Figure 7 This is a schematic diagram of the lateral adjustment device, drive motor, follower disk, plug-in structure, and differential structure in the impact resistance testing device for automobile bumpers.

[0044] Figure 8 This is a schematic diagram of the insertion and removal structure in the impact resistance testing device for automobile bumpers.

[0045] Figure 9 This is an exploded view of the insertion and removal structure in the impact resistance testing device for a car bumper.

[0046] In the diagram: 1. Guide rail; 2. Experimental trolley; 3. Electromagnetic catapult device; 4. Impact section; 5. Connecting plate; 6. Sliding frame; 7. Bumper to be tested; 8. First spring telescopic rod; 9. Follower component; 10. Cylindrical spring; 11. Telescopic shaft; 12. Convex shaft; 13. Locking component; 1301. Inclined surface; 1302. Vertical surface; 14. Linear drive module; 15. Lateral adjustment device; 16. Follower frame; 17. Drive motor; 18. Gear set; 19. Contour bumper; 20. Follower disc; 2001. Locking groove; 2002. Guide inclined surface; 21. Lifting frame; 2101. Locking shaft; 22. Second spring telescopic rod; 23. Electric telescopic rod; 2301. Annular abutment part; 24. Connecting shaft; 2401. Limiting groove. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0048] Please see Figures 1-9 As an embodiment of the present invention, the impact resistance testing device for the automobile bumper includes: a guide rail 1, a test trolley 2, a connecting plate 5, a locking structure and a locking component 13.

[0049] One end of the guide rail 1 is provided with an impact part 4, and the other end is provided with an electromagnetic catapult device 3. The impact part 4 is provided with a contoured bumper 19.

[0050] The experimental trolley 2 is mounted on the guide rail 1, and the electromagnetic catapult 3 can drive the experimental trolley 2 toward the impact part 4.

[0051] The connecting plate 5 is connected to the experimental trolley 2. The connecting plate 5 is provided with an elastic loading structure. The bumper to be tested 7 is detachably installed on the elastic loading structure. The bumper to be tested 7 has a built-in intelligent sensor module, which includes, but is not limited to, an acceleration sensor and a pressure sensor.

[0052] The elastic loading structure includes a sliding frame 6 that can slide horizontally relative to the connecting plate 5, and the sliding frame 6 is connected to the bumper to be tested 7 and the locking structure;

[0053] The elastic loading structure also includes a first spring telescopic rod 8 symmetrically arranged on both sides of the connecting plate 5, and the actuating end of the first spring telescopic rod 8 is connected to the sliding frame 6.

[0054] In this embodiment, the forces applied to the sliding frame 6 by the two sets of first spring telescopic rods 8 are equal in magnitude and opposite in direction, thereby automatically positioning the sliding frame 6 in the middle position of the connecting plate 5 under natural conditions. That is, the sliding frame 6 has an automatic centering effect due to the constraint of the two sets of first spring telescopic rods 8. This allows the bumper 7 to be tested to be precisely centered relative to the experimental trolley 2 after installation, thus establishing the initial reference for the bumper 7 to be tested. Under this reference, only the position and angle of the contoured bumper 19 need to be adjusted to achieve the desired alignment between the bumper 7 to be tested and the contoured bumper 19. The bumpers 19 are subjected to collision tests at different relative positions and angles, which significantly reduces the difficulty of debugging and avoids the problems of repeated alignment, cumbersome debugging, and difficulty in accurately controlling the relative position and angle caused by the fact that both the bumper under test 7 and the contoured bumper 19 can move in the traditional solution. At the same time, since the bumper under test 7 is locked at the central reference position, the overlap and offset of each collision can be referenced to this fixed reference. By precisely adjusting the contoured bumper 19, the collision test can be reliably reproduced, thereby effectively improving the positional accuracy and consistency of the collision test results.

[0055] Furthermore, in the application, when the bumper 7 to be tested collides with the contoured bumper 19, it can cause the bumper 7 to have a tendency to move laterally. This is more in line with the actual collision scenario of the bumper 7 to be tested, so that the generated lateral force can be released. This avoids the difference between the impact resistance test results of the bumper 7 to be tested and the actual impact resistance test results due to the inability to release the lateral force in time, thus improving the test accuracy.

[0056] Please see Figures 5-6 The locking structure is connected to the sliding frame 6, and a convex shaft 12 is provided on the locking structure;

[0057] The locking structure includes a follower 9 connected to the sliding frame 6. The follower 9 has a hollow interior and is provided with a cylindrical spring 10 and a telescopic shaft 11 inside. The telescopic shaft 11 passes through the follower 9 and extends to the outside.

[0058] The convex shaft 12 is rotatably connected to the end of the telescopic shaft 11 away from the cylindrical spring 10;

[0059] The locking member 13 is connected to the linear drive module 14 disposed on the connecting plate 5. The locking member 13 has multiple sets of sawtooth portions symmetrically disposed on both sides, which are adapted to the convex shaft 12. The sawtooth portion includes an inclined surface 1301 and a vertical surface 1302 disposed on the locking member 13. When the bumper 7 to be tested moves laterally after impact, the convex shaft 12 can move from the inclined surface 1301 toward the vertical surface 1302.

[0060] In this embodiment, the cylindrical spring 10 is initially compressed, keeping the telescopic shaft 11 at its maximum extension. At this time, the convex shaft 12 is attached to the upper surface of the locking member 13. When the bumper 7 to be tested collides with the contoured bumper 19 and produces lateral movement, the sliding frame 6 drives the follower 9 connected to it to move laterally, and the convex shaft 12 moves along the length direction of the locking member 13. When the convex shaft 12 moves from the inclined surface 1301 to the vertical surface 1302, the vertical surface 1302 can stop it, thereby preventing the bumper 7 to be tested from returning to its original position under the restoring force of the first spring telescopic rod 8 and impacting the contoured bumper 19 again, effectively avoiding additional damage to the bumper 7 to be tested caused by the secondary collision.

[0061] To further simulate the actual connection strength between the bumper 7 under test and the vehicle body, the two sets of first spring telescopic rods 8 provide a large supporting force. As the speed of the experimental vehicle 2 varies, the impact force between the bumper 7 under test and the contoured bumper 19 also changes, resulting in different lateral displacements of the bumper 7 under test after the collision. By setting multiple sets of serrated sections, when the impact causes the bumper 7 under test to move laterally to the end of its stroke, the cam shaft 12 can engage with the nearest serrated section, significantly reducing the impact force between the cam shaft 12 and the serrated section. This prevents the bumper 7 under test from violently impacting the serrated section under the accelerated reset action of the two sets of first spring telescopic rods 8 when it moves to its limit position, thus protecting the structural integrity of the cam shaft 12 to a certain extent and extending the service life of the device.

[0062] When the sliding frame 6 needs to be reset after the test is completed, the linear drive module 14 is controlled to move. At this time, the linear drive module 14 can drive the locking part 13 to move downward, thereby resetting the cam shaft 12. Under the action of the two sets of first spring telescopic rods 8, the sliding frame 6 can be reset.

[0063] Please see Figure 1 , Figure 3 , Figures 7-9 The impact resistance testing device for the car bumper also includes: a lateral adjustment device 15, a drive motor 17, a follower disk 20, a plug-in structure, and a differential structure.

[0064] The lateral adjustment device 15 is disposed inside the impact part 4, and a follower frame 16 that can slide along the length direction of the impact part 4 is connected to the lateral adjustment device 15. The follower frame 16 is connected to the rotating shaft of the contoured bumper 19.

[0065] In this embodiment, by controlling the movement of the lateral adjustment device 15, the position of the follower frame 16 relative to the impact part 4 can be changed. Since the bumper to be tested 7 is centered by the two sets of first spring telescopic rods 8 in the initial state, when the position of the follower frame 16 changes, the position of the contoured bumper 19 relative to the bumper to be tested 7 will also change. This enables the contoured bumper 19 and the bumper to be tested 7 to be tested to undergo collision testing at different positions, thereby performing impact resistance testing on different positions of the bumper to be tested 7.

[0066] Please see Figures 7-9 The drive motor 17 is mounted on the follower frame 16. The drive motor 17 is connected to the rotating shaft of the contoured bumper 19 through a gear set 18. By controlling the operation of the drive motor 17, the angle of the contoured bumper 19 can be changed under the transmission of the gear set 18, thereby enabling the contoured bumper 19 to collide with the bumper 7 to be tested at different angles.

[0067] The follower disk 20 is coaxially connected to the rotating shaft of the contoured bumper 19;

[0068] The insertion and removal structure is disposed on the follower frame 16. The insertion and removal structure can lock the follower disk 20. The insertion and removal structure includes multiple sets of locking grooves 2001 arranged circumferentially on the follower disk 20. A guide slope 2002 is provided on the upper part of the side wall of the locking groove 2001.

[0069] The insertion and removal structure also includes multiple sets of second spring telescopic rods 22 installed on the follower frame 16. The moving end of the second spring telescopic rod 22 is connected to a lifting frame 21. Multiple sets of locking shafts 2101 that can be inserted into the locking groove 2001 are equidistantly arranged on the lifting frame 21.

[0070] The lifting frame 21 is also connected to a connecting shaft 24 that passes through the follower frame 16. The connecting shaft 24 is provided with a limiting groove 2401 along its length. The limiting groove 2401 is slidably connected to a limiting block provided on the follower frame 16 to limit the rotation of the lifting frame 21 and ensure the axial stability of the follower plate 20 when the locking shaft 2101 is inserted into the locking groove 2001.

[0071] In this embodiment, when the angle of the contoured bumper 19 is adjusted, the locking shaft 2101 is inserted into the locking groove 2001, thereby ensuring that the contoured bumper 19 can be locked in the event of an impact, thus improving the accuracy of the angle between the contoured bumper 19 and the bumper 7 to be tested before the impact.

[0072] Furthermore, the locking of the aforementioned contoured bumper 19 relies on the cooperation of multiple sets of locking shafts 2101 and locking grooves 2001, so that at the moment of impact, the force on the contoured bumper 19 can be evenly distributed to each locking shaft 2101, improving the stability of the contoured bumper 19's pivot locking. Compared with the existing self-locking gear set (such as worm gear), it avoids tooth breakage under large impact forces.

[0073] Furthermore, for the existing drive motor 17, its shaft often has a certain rotational error. Although this rotational error is very small, the length of the contoured bumper 19 is comparable to the length of the bumper 7 to be tested. This means that when the contoured bumper 19 is at a certain length, the aforementioned rotational error will be amplified. Consequently, when the contoured bumper 19 and the bumper 7 to be tested collide with a small overlap area, the corresponding collision angle is often difficult to control. In this embodiment, after the contoured bumper 19 completes the angle adjustment, the lifting frame 21 will drive the locking shaft 2101 to move toward the follower plate 20. During this process, the guide slope 2002 can guide the locking shaft 2101 into the locking groove 2001, thereby compensating for the rotational error of the drive motor 17 and ensuring the accuracy of the angle between the contoured bumper 19 and the bumper 7 to be tested before the collision.

[0074] Please see Figure 8 The differential structure connects the follower frame 16 and the plug-in structure. The differential structure can cause the plug-in structure to abut against the follower disk 20 when the follower disk 20 rotates at a predetermined angle.

[0075] The differential structure includes an electric telescopic rod 23 installed on the follower frame 16, and the actuating end of the electric telescopic rod 23 is slidably connected to the lifting frame 21.

[0076] The end of the electric telescopic rod 23 is also provided with an annular abutment part 2301.

[0077] In this embodiment, when the electric telescopic rod 23 is activated, it can drive the annular abutment part 2301 connected to it to move upward. When the annular abutment part 2301 abuts against the lifting frame 21, it drives the lifting frame 21 to move upward, thereby separating the locking groove 2001 from the locking shaft 2101. At this time, the rotating shaft of the contoured bumper 19 is in the unlocked state. Subsequently, the drive motor 17 rotates and drives the rotating shaft of the contoured bumper 19 and the follower disk 20 to rotate. When the rotating shaft of the contoured bumper 19 and the follower disk 20 are about to rotate to a predetermined angle, the actuating end of the electric telescopic rod 23 moves downward, so that under the action of the second spring telescopic rod 22, the locking shaft 2101 can abut against the upper surface of the follower disk 20. When the rotating shaft and the follower disk 20 rotate to the predetermined angle, the guide slope 2002 guides the locking shaft 2101 into the locking groove 2001, thereby locking the rotating shaft of the contoured bumper 19.

[0078] Based on the above settings, the second spring telescopic rod 22 provides power during the process of inserting the locking shaft 2101 into the locking groove 2001, so that the locking shaft 2101 can smoothly enter the locking groove 2001, avoiding direct drive by the electric telescopic rod 23, and preventing jamming or mislocking under the action timing error.

[0079] As an embodiment of the present invention, an intelligent sensing test method using the impact resistance test device for the automobile bumper is also proposed, comprising the following steps:

[0080] Step 1: Install the smart sensor module onto the bumper 7 to be tested, and then install the bumper 7 to be tested onto the connecting plate 5;

[0081] Step 2: Adjust the position and angle of the contour bumper 19;

[0082] Step 3: Drive the experimental trolley 2 toward the impact point 4 using the electromagnetic catapult device 3;

[0083] Step 4: When the contoured bumper 19 collides with the bumper 7 to be tested, the force on the bumper 7 to be tested is obtained through the intelligent sensor module.

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0085] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An impact resistance testing device for automobile bumpers, comprising: The guide rail has an impact part at one end and an electromagnetic catapult at the other end, with a contoured bumper on the impact part. An experimental trolley is mounted on the guide rail, and the electromagnetic catapult can drive the experimental trolley toward the impact point. Its characteristic is that it further includes: A connecting plate is connected to the experimental trolley. The connecting plate is equipped with an elastic loading structure. A bumper to be tested is detachably installed on the elastic loading structure. The bumper to be tested has a built-in intelligent sensor module. A locking structure is connected to the elastic loading structure, and a convex shaft is provided on the locking structure; A locking component is connected to a linear drive module mounted on the connecting plate. The locking component has multiple sets of serrated portions on both sides that are adapted to the cam shaft.

2. The impact resistance testing device for an automobile bumper according to claim 1, characterized in that, The elastic loading structure includes a sliding frame that can slide horizontally relative to the connecting plate, and the sliding frame is connected to the bumper to be tested and the locking structure; The elastic loading structure also includes a first spring telescopic rod symmetrically arranged on both sides of the connecting plate, and the actuating end of the first spring telescopic rod is connected to the sliding frame.

3. The impact resistance testing device for an automobile bumper according to claim 2, characterized in that, The locking structure includes a follower connected to the sliding frame. The follower has a hollow interior and is equipped with a cylindrical spring and a telescopic shaft. The telescopic shaft passes through the follower and extends to the outside. The convex shaft is rotatably connected to the end of the telescopic shaft away from the cylindrical spring.

4. The impact resistance testing device for an automobile bumper according to claim 1, characterized in that, The serrated part includes an inclined surface and a vertical surface provided on the locking member. When the bumper to be tested is laterally displaced after impact, the convex shaft can move from the inclined surface toward the vertical surface.

5. The impact resistance testing device for an automobile bumper according to claim 1, characterized in that, Also includes: A lateral adjustment device is provided inside the impact part, and a follower frame that can slide along the length direction of the impact part is connected to the lateral adjustment device. The follower frame is connected to the rotating shaft of the contoured bumper. A drive motor is mounted on the follower frame, and the drive motor is connected to the rotating shaft of the contoured bumper through a gear set; The follower disc is coaxially connected to the rotating shaft of the contoured bumper; A plug-in structure is provided on the follower frame, and the plug-in structure can lock the follower disk; A differential structure connects the follower frame and the plug-in structure. The differential structure enables the plug-in structure to abut against the follower disk when the follower disk rotates at a predetermined angle.

6. The impact resistance testing device for an automobile bumper according to claim 5, characterized in that, The insertion and removal structure includes multiple sets of locking grooves arranged circumferentially and at equal intervals on the follower disk, and a guide slope is provided on the upper part of the side wall of the locking groove.

7. The impact resistance testing device for an automobile bumper according to claim 6, characterized in that, The insertion and removal structure also includes multiple sets of second spring telescopic rods installed on the follower frame. The moving end of the second spring telescopic rod is connected to a lifting frame. Multiple sets of locking shafts that can be inserted into the locking groove are arranged in a circular and equidistant manner on the lifting frame. The lifting frame is also connected to a connecting shaft that passes through the follower frame. The connecting shaft is provided with a limit groove along its length direction. The limit groove is slidably connected to a limit block provided on the follower frame.

8. The impact resistance testing device for an automobile bumper according to claim 7, characterized in that, The differential structure includes an electric telescopic rod installed on the follower frame, and the actuating end of the electric telescopic rod is slidably connected to the lifting frame. The end of the electric telescopic pole is also provided with an annular abutment.

9. A smart sensing test method using the impact resistance testing device for automobile bumpers as described in claim 1, characterized in that, Includes the following steps: Step 1: Install the smart sensor module onto the bumper to be tested, and then install the bumper to be tested onto the connecting plate; Step 2: Adjust the position and angle of the contoured bumper; Step 3: The experimental trolley is propelled toward the impact point using an electromagnetic catapult. Step 4: When the contoured bumper collides with the bumper to be tested, the force on the bumper to be tested is obtained through the intelligent sensor module.

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