Fatigue strength testing device for automobile bumper

Abstract

The utility model belongs to the technical field of testing devices, and particularly relates to an automobile bumper fatigue strength testing device which comprises a testing device body, one side of the testing device body is fixedly connected with a second motor, one end of an output shaft of the second motor is fixedly connected with a lead screw, and the outer wall of the lead screw is in threaded connection with a moving block. The bottom end of the moving block is fixedly connected with an air cylinder, and the bottom end of the air cylinder is fixedly connected with a pressing disc. Through the arranged vibration assembly, when the fatigue strength of the bumper main body is tested, the first motor is controlled to rotate, the first motor rotates to drive the rotating disc and the lifting block to rotate, the lifting block rotates to drive the lifting rod to vibrate up and down, and the lifting rod drives the bumper main body in the workbench to vibrate up and down; the bumper main body vibrates up and down to simulate the vibration environment in actual road driving, and the test can be ensured to be closer to the actual use condition by simulating the vibration environment in actual road driving, so that the accuracy and reliability of the test are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing devices, in particular to a vehicle bumper fatigue strength testing device. Background Art

[0002] In the automotive industry, the bumper is an important safety component at the front and rear of the vehicle. Its performance is directly related to the vehicle's ability to protect occupants and external objects in a collision accident. The fatigue strength of the bumper is one of the important indicators for evaluating its performance. In the automobile bumper fatigue strength testing device, fatigue damage is gradually accumulated on the bumper by repeatedly applying stress cycles until the critical point of fatigue failure is reached. The data is then collected and its fatigue strength is analyzed.

[0003] Traditional bumper fatigue strength testing devices often use static loading, that is, by applying a constant force or torque on the bumper to simulate the collision effect and observe its deformation or damage. However, vehicles in actual road driving are in a vibration environment for a long time. These vibrations will produce cumulative fatigue effects on the bumper, affecting its long-term reliability and safety. For this reason, traditional bumper fatigue strength testing devices are difficult to accurately evaluate the fatigue strength of the bumper.

[0004] Therefore, in order to solve the above problems, a vehicle bumper fatigue strength testing device is proposed. Utility Model Content

[0005] In order to make up for the shortcomings of the existing technology and solve the problem that the traditional static loading test method will produce cumulative fatigue effects on the bumper body due to vibration, affecting the fatigue strength of the bumper body and limiting the accuracy of the test, a car bumper fatigue strength test device is proposed.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: the present invention is a vehicle bumper fatigue strength test device, comprising a test device body, one side of the test device body is fixedly connected to a second motor, one end of the second motor output shaft is fixedly connected to a screw, the outer wall of the screw is threadedly connected to a moving block, the bottom end of the moving block is fixedly connected to a cylinder, the bottom end of the cylinder is fixedly connected to a pressure plate, a workbench is provided below the pressure plate, the bumper body is provided inside the workbench, and the bottom end of the workbench is provided with a vibration component for vibrating up and down to simulate road bumps;

[0007] The vibration component includes a connecting block fixedly connected to the bottom end of the workbench, the bottom end of the connecting block is evenly fixedly connected to a lifting rod, the bottom end of the lifting rod is provided with a rising block, the bottom end of the rising block is fixedly connected to a rotating disk, the bottom end of the rotating disk is provided with a first motor, the rotating disk is fixedly sleeved on the outer wall of the output shaft of the first motor, and the first motor is fixedly connected to the inner wall of the test device body; the traditional static loading test method is avoided, because vibration will produce a cumulative fatigue effect on the bumper body, affecting the fatigue strength of the bumper body, so that the accuracy of the test is limited. By simulating the vibration environment in actual road driving, it is ensured that the test can be closer to the actual usage, thereby improving the accuracy and reliability of the test.

[0008] Preferably, two protective doors are hinged on one side of the workbench, one side of one of the protective doors is fixedly connected to a support block, the inner wall of the support block is slidably connected to a slider, the inner wall of the support block and the slider are connected by a spring, one side of the slider is fixedly connected to a limit block, the limit block is slidably connected to a groove on the side of the support block away from the workbench, and one side of the other protective door is fixedly connected to a slide groove, and the slider is slidably connected to the inner wall of the slide groove; this avoids the problem that the bumper body may be deformed and damaged during the pressure application process, or even fragments may fly out and injure the operator, protects the safety of the testers, and facilitates subsequent cleaning.

[0009] Preferably, two limit plates are fixedly connected to the inner wall of the workbench, and the two limit plates are symmetrically arranged about the center of the workbench; this avoids the problem of the workbench tipping over and affecting the closing of the protective door during the closing process of the protective door, thereby optimizing the installation process.

[0010] Preferably, the rising block and the lifting rod are distributed in a circular array with the axis of the rotating disk as the center, the cross section of one side of the rising block is set to an inclined plane, and the distance between the bottom end and the top end of the lifting rod is greater than the distance between the top end and the bottom end of the rising block; the circular array distribution helps to reduce the local stress concentration phenomenon during the test process, making the test results more accurate and reliable. At the same time, the uniform force distribution also helps to extend the service life of the test device and reduce the wear or damage of components caused by uneven force.

[0011] Preferably, the cross-sections of the two protective doors at one end away from the main body of the test device are both set to be "L"-shaped; the "L"-shaped protective door can move along a relatively stable trajectory during the opening process, reducing the impact and vibration that may be generated during opening or closing.

[0012] Preferably, support rods are provided on both sides of the lifting rod, and the two support rods are fixedly connected to the bottom end of the workbench. The two support rods are embedded in the inner wall of the test device body, and the support rods are slidably connected to the test device body; the support rods slide in the test device body, providing a stable support point for the vibration process, which helps to reduce shaking during the vibration process and ensure the accuracy of the test results.

[0013] Beneficial effects of the utility model:

[0014] The utility model provides a vehicle bumper fatigue strength testing device. Through the provided vibration component, when the fatigue strength test is performed on the bumper body, the first motor is controlled to rotate, the rotation of the first motor drives the rotating disk and the rising block to rotate, the rotation of the rising block drives the lifting rod to vibrate up and down, and the lifting rod drives the bumper body on the workbench to vibrate up and down. The up and down vibration of the bumper body is used to simulate the vibration environment in actual road driving, avoiding the traditional static loading test method. Since vibration will produce a cumulative fatigue effect on the bumper body, affecting the fatigue strength of the bumper body, so that the accuracy of the test is limited. By simulating the vibration environment in actual road driving, it is ensured that the test can be closer to the actual use situation, thereby improving the accuracy and reliability of the test.

[0015] The utility model provides a vehicle bumper fatigue strength testing device. Through the provided protective door, after the vibration simulation is completed, when pressure needs to be applied to the bumper body, power is turned on to rotate the second motor, and the rotation of the second motor controls the moving block to move back and forth to a suitable position, and then controls the cylinder to push the pressure plate to apply pressure to the bumper body to obtain the required data. The bumper body is placed between the workbench and the protective door, avoiding the problem that the bumper body may be deformed and damaged during the pressure application process, or even fragments may fly out and cause harm to the operator, thereby protecting the safety of the test personnel and facilitating subsequent cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a cross-sectional view of the protective door structure of the utility model;

[0019] Figure 3 This is a cross-sectional view of the overall structure of the utility model;

[0020] Figure 4This utility model Figure 2 Enlarged view of point A in the middle.

[0021] Legend:

[0022] 1. Test device body; 2. First motor; 3. Rotating disk; 4. Rising block; 5. Lifting rod; 6. Connecting block; 7. Workbench; 8. Limit plate; 9. Bumper body; 10. Second motor; 11. Screw; 12. Moving block; 13. Cylinder; 14. Pressure plate; 15. Support block; 16. Spring; 17. Slider; 18. Limit block; 19. Slide; 20. Protective door; 21. Support rod. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0024] Specific examples are given below.

[0025] See also Figures 1-4 The utility model provides a vehicle bumper fatigue strength testing device, comprising a testing device body 1, a second motor 10 being fixedly connected to one side of the testing device body 1, a screw rod 11 being fixedly connected to one end of the output shaft of the second motor 10, a moving block 12 being threadedly connected to the outer wall of the screw rod 11, a cylinder 13 being fixedly connected to the bottom end of the moving block 12, a pressure plate 14 being fixedly connected to the bottom end of the cylinder 13, a workbench 7 being provided below the pressure plate 14, a bumper body 9 being provided inside the workbench 7, and a vibration component for vibrating up and down to simulate road bumps being provided at the bottom end of the workbench 7;

[0026] The vibration assembly includes a connecting block 6 fixedly connected to the bottom end of the workbench 7, the bottom end of the connecting block 6 is evenly fixedly connected to the lifting rod 5, the bottom end of the lifting rod 5 is provided with a rising block 4, the bottom end of the rising block 4 is fixedly connected to the rotating disk 3, the bottom end of the rotating disk 3 is provided with a first motor 2, the rotating disk 3 is fixedly sleeved on the outer wall of the output shaft of the first motor 2, and the first motor 2 is fixedly connected to the inner wall of the test device body 1.

[0027] During operation, through the vibration component set up, when the bumper body 9 is subjected to fatigue strength test, the first motor 2 is controlled to rotate, and the rotation of the first motor 2 drives the rotating disk 3 and the rising block 4 to rotate, and the rotation of the rising block 4 drives the lifting rod 5 to vibrate up and down, and the lifting rod 5 drives the bumper body 9 in the workbench 7 to vibrate up and down, and the up and down vibration of the bumper body 9 is used to simulate the vibration environment in actual road driving, avoiding the traditional static loading test method, because the vibration will produce a cumulative fatigue effect on the bumper body 9, affecting the fatigue strength of the bumper body 9, so that the accuracy of the test is limited. By simulating the vibration environment in actual road driving, it is ensured that the test can be closer to the actual usage, thereby improving the accuracy and reliability of the test.

[0028] Further, such as Figure 2 and Figure 4 As shown, two protective doors 20 are hinged on one side of the workbench 7, one side of one protective door 20 is fixedly connected to a support block 15, the inner wall of the support block 15 is slidably connected to a slider 17, the inner wall of the support block 15 and the slider 17 are connected by a spring 16, one side of the slider 17 is fixedly connected to a limit block 18, the limit block 18 is slidably connected to the groove on the side of the support block 15 away from the workbench 7, and one side of the other protective door 20 is fixedly connected to a slide groove 19, and the slider 17 is slidably connected to the inner wall of the slide groove 19.

[0029] During operation, through the protective door 20, after the vibration simulation is completed, when it is necessary to apply pressure to the bumper body 9, the second motor 10 is powered on to rotate, and the second motor 10 rotates to control the moving block 12 to move back and forth to the appropriate position, and then controls the cylinder 13 to push the pressure plate 14 to apply pressure to the bumper body 9 to obtain the required data. The bumper body 9 is placed between the workbench 7 and the protective door 20, which avoids the problem that the bumper body 9 may be deformed and damaged during the pressure process, or even fragments may fly out, causing harm to the operator, thereby protecting the safety of the testers and facilitating subsequent cleaning.

[0030] Further, such as Figure 3 As shown, two limit plates 8 are fixedly connected to the inner wall of the workbench 7 , and the two limit plates 8 are symmetrically arranged about the center of the workbench 7 .

[0031] During operation, when the bumper body 9 needs to be placed on the workbench 7 and a fatigue strength test is performed through the set limit plate 8, the protective door 20 is opened, and the two sides of the bumper body 9 are placed between the limit plate 8 and the workbench 7, and the workbench 7 is limited to avoid the problem of the workbench 7 tipping over and affecting the closing of the protective door 20 during the closing process of the protective door 20, thereby optimizing the installation process.

[0032] Further, such as Figure 3As shown, the rising block 4 and the lifting rod 5 are distributed in a circular array with the axis of the rotating disk 3 as the center. The cross section of one side of the rising block 4 is set as an inclined plane, and the distance between the bottom end and the top end of the lifting rod 5 is greater than the distance between the top end and the bottom end of the rising block 4.

[0033] During operation, by setting the rising block 4 and the lifting rod 5, when it is necessary to perform fatigue strength test on the bumper body 9 and simulate vibration, the first motor 2 is controlled to rotate, and the rotation of the first motor 2 drives the rotating disk 3 and the rising block 4 to rotate, and the rotation of the rising block 4 drives the lifting rod 5 to vibrate up and down, and the lifting rod 5 drives the bumper body 9 in the workbench 7 to vibrate up and down. The bumper body 9 vibrates up and down to simulate the vibration environment in actual road driving. The circumferential array distribution helps to reduce local stress concentration during the test process, making the test results more accurate and reliable. At the same time, the uniform force distribution also helps to extend the service life of the test device and reduce component wear or damage caused by uneven force.

[0034] Further, such as Figure 2 As shown, the cross-sections of the two protective doors 20 at the ends away from the testing device body 1 are both set to be "L"-shaped.

[0035] During operation, through the protective door 20, when the bumper body 9 needs to be placed on the workbench 7 and a fatigue strength test is performed, the limit block 18 is pulled, and the limit block 18 drives the slider 17 to move away from the slide groove 19. At this time, the protective door 20 is opened to both sides. The "L"-shaped protective door 20 can move along a relatively stable trajectory during the opening process, reducing the impact and vibration that may be generated during opening or closing.

[0036] Further, such as Figure 3 As shown, support rods 21 are provided on both sides of the lifting rod 5, and the two support rods 21 are fixedly connected to the bottom end of the workbench 7. The two support rods 21 are embedded in the inner wall of the test device body 1, and the support rods 21 are slidably connected to the test device body 1.

[0037] During operation, through the support rod 21, when it is necessary to perform fatigue strength test on the bumper body 9 and simulate vibration, the first motor 2 is controlled to rotate, and the rotation of the first motor 2 drives the lifting rod 5 to vibrate up and down, and the lifting rod 5 then drives the bumper body 9 in the workbench 7 to vibrate up and down. The support rod 21 slides in the test device body 1, providing a stable support point for the vibration process, which helps to reduce the shaking phenomenon during the vibration process and ensure the accuracy of the test results.

[0038] Working principle:

[0039] When it is necessary to sample a batch of automobile bumpers and conduct fatigue strength test on the bumper body 9;

[0040] Step 1: Pull the limit block 18, the limit block 18 drives the slider 17 to move away from the slide groove 19 and compress the bumper body 9. At this time, open the protective door 20 to both sides, release the limit block 18, the spring 16 rebounds and pushes the screw rod 11 back to its original position, place the bumper between the two limit plates 8, close the protective door 20 from both sides, pull the limit block 18 again, and similarly, insert the slider 17 into the slide groove 19 to complete the fixation of the bumper body 9 and the protective door 20.

[0041] In the second step, turn on the first motor 2. The output shaft on the first motor 2 drives the rotating disk 3 to rotate. The rotation of the rotating disk 3 drives the rising block 4 to rotate. The rising block 4 rotates, and the lifting rod 5 rises through the inclined surface of the rising block 4 and rises to the highest point of the rising block 4. Then the rising block 4 continues to rotate, and the lifting rod 5 falls from the highest point of the rising block 4. The above process is repeated continuously, so that the rotation of the rising block 4 drives the lifting rod 5 to rise and fall, and the lifting rod 5 drives the connecting block 6 to move up and down, and the connecting block 6 drives the workbench 7 to move up and down, and the workbench 7 drives the bumper body 9 to move up and down, simulating the bumps of the road in actual application of the bumper body 9.

[0042] Step 3: After the simulation is completed, the second motor 10 is controlled to rotate, and the second motor 10 drives the screw rod 11 to rotate. The rotation of the screw rod 11 drives the moving block 12 to move forward and backward. The moving block 12 drives the cylinder 13 to move forward and backward. The cylinder 13 drives the pressure plate 14 to move forward and backward. Move to the appropriate position, control the cylinder 13 to push the pressure plate 14 to contact and apply pressure to the bumper body 9 to obtain the required data.

[0043] Step 4: Pull the limit block 18. Similarly, open the protective door 20 to both sides, take out the bumper body 9, and complete the test.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A vehicle bumper fatigue strength testing device, characterized by: The invention comprises a test device body (1), wherein one side of the test device body (1) is fixedly connected to a second motor (10), one end of the output shaft of the second motor (10) is fixedly connected to a screw rod (11), the outer wall of the screw rod (11) is threadedly connected to a moving block (12), the bottom end of the moving block (12) is fixedly connected to a cylinder (13), the bottom end of the cylinder (13) is fixedly connected to a pressure plate (14), a workbench (7) is provided below the pressure plate (14), a bumper body (9) is provided inside the workbench (7), and a vibration component for vibrating up and down to simulate road bumps is provided at the bottom end of the workbench (7); The vibration assembly comprises a connecting block (6) fixedly connected to the bottom end of the workbench (7), the bottom end of the connecting block (6) is evenly fixedly connected to a lifting rod (5), the bottom end of each lifting rod (5) is provided with a rising block (4), the bottom end of the rising block (4) is fixedly connected to a rotating disk (3), the bottom end of the rotating disk (3) is provided with a first motor (2), the rotating disk (3) is fixedly sleeved on the outer wall of the output shaft of the first motor (2), and the first motor (2) is fixedly connected to the inner wall of the test device body (1).

2. The vehicle bumper fatigue strength testing device according to claim 1, characterized in that: Two protective doors (20) are hinged on one side of the workbench (7), one side of the protective door (20) is fixedly connected to a support block (15), the inner wall of the support block (15) is slidably connected to a slider (17), the inner wall of the support block (15) and the slider (17) are connected via a spring (16), one side of the slider (17) is fixedly connected to a limit block (18), the limit block (18) is slidably connected to a groove on the side of the support block (15) away from the workbench (7), and one side of the other protective door (20) is fixedly connected to a slide groove (19), and the slider (17) is slidably connected to the inner wall of the slide groove (19).

3. The automobile bumper fatigue strength testing device according to claim 1, characterized in that: Two limiting plates (8) are fixedly connected to the inner wall of the workbench (7), and the two limiting plates (8) are symmetrically arranged about the center of the workbench (7).

4. The automobile bumper fatigue strength testing device according to claim 1, characterized in that: The rising block (4) and the lifting rod (5) are both distributed in a circular array with the axis of the rotating disk (3) as the center. The cross section of one side of the rising block (4) is set as an inclined surface. The distance between the bottom end and the top end of the lifting rod (5) is greater than the distance between the top end and the bottom end of the rising block (4).

5. The automobile bumper fatigue strength testing device according to claim 2, characterized in that: The cross-sections of the two protective doors (20) at the ends away from the testing device body (1) are both set to be "L"-shaped.

6. The automobile bumper fatigue strength testing device according to claim 1, characterized in that: Support rods (21) are provided on both sides of the lifting rod (5), and the two support rods (21) are fixedly connected to the bottom end of the workbench (7). The two support rods (21) are embedded in the inner wall of the test device body (1), and the support rods (21) are slidably connected to the test device body (1).

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