Three-point bending test tool suitable for vehicle door bumper bar

Abstract

The utility model relates to the field of automobile collision safety test, and discloses a three-point bending test tool suitable for an automobile door bumper bar, which comprises a loading head and a support block, and is characterized in that the loading head can be connected with loading equipment and is provided with a loading groove capable of being contacted with the automobile door bumper bar to be tested; the supporting block is provided with a supporting groove which can be in contact with a to-be-tested vehicle door bumper bar. And the loading groove and the supporting groove are cambered surface grooves. The two supporting blocks are used for supporting the to-be-tested vehicle door anti-collision rod, and the loading device drives the loading head to move downwards so that the to-be-tested vehicle door anti-collision rod can be loaded. The loading groove and the supporting groove which are in contact with the to-be-tested vehicle door anti-collision rod are cambered surface grooves, the testing tool can adapt to the to-be-tested vehicle door anti-collision rods of various specifications, the flexible adaptability of the testing tool is improved, the testing efficiency is improved, the testing cost is saved, meanwhile, deformation of the to-be-tested vehicle door anti-collision rod is prevented from being affected, and the accuracy of a testing result is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of automotive collision safety testing technology, and in particular to a three-point bend testing fixture suitable for car door anti-collision bars. Background Technology

[0002] In automotive passive safety systems, door impact bars are key load-bearing components for side-impact protection within the door, and their mechanical properties directly affect the force transmission path and energy absorption effect during a collision. Door impact bars are typically installed between the door trim panel and the door steel panel, covering the main stress-bearing area during a side impact. When a vehicle experiences a side impact, the door impact bar will initially absorb the impact force. The bar must absorb kinetic energy through its own plastic deformation, converting the impact energy into the internal energy of its deformation, while simultaneously maintaining the structural integrity of the door frame to prevent excessive intrusion into the passenger compartment.

[0003] During the design phase, it is necessary to test the bending performance of the door anti-collision bars to provide data support for evaluating their energy absorption efficiency, deformation controllability, and maximum load-bearing capacity under real collision conditions.

[0004] In the existing technology, when testing door anti-collision bars, testing machines and fixtures that match the door anti-collision bars are generally used. Different specifications of door anti-collision bars require special fixtures, which increases the workload of testing, reduces testing efficiency, and has a high testing cost. Utility Model Content

[0005] The purpose of this invention is to provide a three-point bend test fixture suitable for car door anti-collision bars, so as to solve the problems existing in the above-mentioned related technologies, so that the test fixture can adapt to different specifications of car door anti-collision bars under test, improve the adaptability of the test fixture, improve testing efficiency, and save testing costs.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a three-point bend test fixture suitable for vehicle door anti-collision bars, comprising:

[0008] A loading head, which can be connected to a loading device, which can drive the loading head to move in order to load the door anti-collision bar under test, and the loading head has a loading groove that can contact the door anti-collision bar under test;

[0009] The support blocks are in two sets, with the two support blocks located on both sides of the loading head and below the loading head. The support blocks can be fixed on the worktable, and the support blocks have support grooves that can contact the anti-collision bar of the door to be tested.

[0010] Both the loading groove and the supporting groove are arc-shaped grooves; in a plane perpendicular to the direction of movement, the center lines of the projections of the loading groove and the two supporting grooves coincide.

[0011] Preferably, the loading head has a semi-cylindrical structure, and the loading groove is located on the outer peripheral surface of the loading head and is arranged around the axis of the loading head;

[0012] The loading groove is cut along the plane containing the axis of the loading head, and the cross-section of the loading groove is semi-circular.

[0013] Preferably, the support block includes a semi-cylindrical portion and a cuboid portion, the semi-cylindrical portion is disposed on the top of the cuboid portion and the two are connected, the axis of the semi-cylindrical portion is parallel to the axis of the loading head, and the support groove is located on the outer peripheral surface of the semi-cylindrical portion and extends to the opposite two sides of the cuboid portion.

[0014] The support groove located on the semi-cylindrical portion is cut along the plane containing the axis of the semi-cylindrical portion, and the cross-section of the support groove is semi-circular; the cross-section of the support groove located on the cuboid portion is also semi-circular.

[0015] Preferably, the top of the loading head has a threaded hole, which is a blind hole, and the loading head can be threadedly connected to the loading device using the threaded hole.

[0016] Preferably, the loading head is further connected to a locking nut, which is rotatably disposed at the threaded hole. After the loading head is threadedly connected to the loading device, the locking nut can be threadedly connected to the loading device to lock the loading head and the loading device.

[0017] Preferably, the arc surfaces of the loading groove and the supporting groove are matched with the outer peripheral surface of the door anti-collision bar under test.

[0018] Preferably, the three-point bend test fixture for car door anti-collision bars further includes a base, which is disposed at the bottom of the support block and the two correspond one-to-one, and the base can be connected to the workbench.

[0019] Preferably, the base and the support block are connected by a positioning pin.

[0020] The number of positioning pins is two sets.

[0021] Preferably, the base and the support block are connected by screws, the base has a countersunk hole adapted to the screws, and the support block has a threaded hole adapted to the screws.

[0022] Preferably, the base has connecting holes, which allow it to be bolted to the workbench; the number of connecting holes is multiple.

[0023] The connecting hole is an oblong hole, and the length direction of the connecting hole is parallel to the line connecting the two support blocks.

[0024] This utility model achieves the following technical effects compared to related technologies: The three-point bend test fixture for car door anti-collision bars of this utility model includes a loading head and support blocks. The loading head can be connected to a loading device, which can drive the loading head to move to load the car door anti-collision bar under test. The loading head has a loading groove that can contact the car door anti-collision bar under test. There are two sets of support blocks, which are located on both sides of the loading head and below the loading head. The support blocks can be fixed on the worktable and have support grooves that can contact the car door anti-collision bar under test. Both the loading groove and the support groove are arc-shaped grooves. In a plane perpendicular to the direction of movement, the center lines of the projections of the loading groove and the two support grooves coincide.

[0025] This utility model discloses a three-point bend testing fixture for car door anti-collision bars. During operation, two support blocks support the anti-collision bar under test. These support blocks connect to a worktable to ensure stability. A loading head is positioned between and above the two support blocks and connects to a loading device. The loading device drives the loading head downwards to apply load to the anti-collision bar, completing the mechanical performance test. The loading and support grooves in this three-point bend testing fixture are both arc-shaped, accommodating various sizes of anti-collision bars and improving the fixture's flexibility. This simplifies the testing process, increases efficiency, and reduces costs. The arc-shaped grooves also prevent deformation of the anti-collision bar while supporting it and applying load, ensuring accurate test results. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the three-point bend test fixture for a car door anti-collision bar disclosed in an embodiment of the present utility model.

[0028] Figure 2This is a schematic diagram of the loading process of the three-point bend test fixture for a car door anti-collision bar disclosed in this embodiment of the utility model.

[0029] Figure 3 This is a schematic diagram of the loading head of the three-point bend test fixture for a car door anti-collision bar disclosed in an embodiment of the present utility model.

[0030] Figure 4 This is a schematic diagram of the loading head and locking nut of the three-point bend test fixture for a car door anti-collision bar disclosed in an embodiment of the present utility model.

[0031] Figure 5 This is a schematic diagram of the support block and base of the three-point bend test fixture for a car door anti-collision bar disclosed in an embodiment of the present utility model.

[0032] Figure 6 This is a schematic diagram of the base of the three-point bend test fixture for car door anti-collision bars disclosed in the embodiments of this utility model.

[0033] In the diagram: 1. Loading head; 101. Loading groove; 2. Support block; 201. Support groove; 3. Locking nut; 4. Base; 401. Countersunk hole; 402. Connecting hole; 5. Pin hole; 6. Door anti-collision bar under test. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] The purpose of this invention is to provide a three-point bend test fixture suitable for car door anti-collision bars, so as to solve the problems existing in the above-mentioned related technologies, so that the test fixture can adapt to different specifications of car door anti-collision bars under test, improve the adaptability of the test fixture, improve testing efficiency, and save testing costs.

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] This embodiment provides a three-point bend test fixture suitable for vehicle door anti-collision bars. Please refer to [reference needed]. Figures 1-6The system includes a loading head 1 and support blocks 2. The loading head 1 can be connected to a loading device, which can drive the loading head 1 to move in order to load the door anti-collision bar 6 under test. The loading head 1 has a loading groove 101 that can contact the door anti-collision bar 6 under test. There are two sets of support blocks 2, which are located on both sides of the loading head 1 and below the loading head 1. The support blocks 2 can be fixed on the worktable. The support blocks 2 have support grooves 201 that can contact the door anti-collision bar 6 under test. Both the loading groove 101 and the support groove 201 are arc-shaped grooves. In a plane perpendicular to the direction of movement, the center lines of the projections of the loading groove 101 and the two support grooves 201 coincide.

[0039] This utility model discloses a three-point bend testing fixture for car door anti-collision bars. During operation, two support blocks 2 support the anti-collision bar 6 to be tested. The support blocks 2 can be connected to a worktable to ensure support stability. The loading head 1 is located between and above the two support blocks 2. The loading head 1 can be connected to a loading device. The loading device drives the loading head 1 downward to load the anti-collision bar 6, completing the mechanical performance test of the anti-collision bar 6. In this utility model, the loading groove 101 and support groove 201 that contact the anti-collision bar 6 are both arc-shaped grooves, which can adapt to various specifications of anti-collision bars 6, improving the flexibility and adaptability of the testing fixture, simplifying the testing process, improving testing efficiency, and saving testing costs. Both the loading groove 101 and the support groove 201 are arc-shaped grooves. While supporting and applying load to the door anti-collision bar 6 under test, they avoid affecting the deformation of the door anti-collision bar 6 under test. In addition, the line connecting the loading head 1 and the two support blocks 2 coincides with the axis of the door anti-collision bar 6 under test, which can also prevent the test fixture from affecting the load deformation of the door anti-collision bar 6 under test and ensure the accuracy of the test results.

[0040] The loading head 1 has a semi-cylindrical structure, and the loading groove 101 is located on the outer peripheral surface of the loading head 1 and is arranged around the axis of the loading head 1. This allows the loading groove 101 to better adapt to the shape of the door anti-collision bar 6 under test, while avoiding affecting the load deformation of the door anti-collision bar 6 under test during loading. It should be explained that in actual testing, the test may end when a certain load is reached or when the door anti-collision bar 6 under test undergoes a certain degree of deformation. Therefore, the loading groove 101 of this invention is located on the outer peripheral surface of the loading head 1 and is arranged around the axis of the loading head 1. While adapting to various specifications of door anti-collision bars 6 under test, it minimizes the impact of the loading head 1 and the loading groove 101 on the normal load deformation of the door anti-collision bar 6 under test, thereby meeting different testing requirements and further improving the adaptability of the testing fixture. The specific testing methods and test termination criteria are common knowledge to those skilled in the art and will not be elaborated here.

[0041] In this specific embodiment, the loading groove 101 is cut along the plane containing the axis of the loading head 1. The cross-section of the loading groove 101 is semi-circular to better match the shape of the door anti-collision bar 6 to be tested.

[0042] Accordingly, in this specific embodiment, the support block 2 includes a semi-cylindrical part and a cuboid part. The semi-cylindrical part is disposed on the top of the cuboid part and the two are connected. The axis of the semi-cylindrical part is parallel to the axis of the loading head 1. The support groove 201 is located on the outer peripheral surface of the semi-cylindrical part and extends to the opposite two sides of the cuboid part, so as to avoid the test fixture from affecting the load deformation of the door anti-collision bar 6 under test to the greatest extent and meet various test requirements.

[0043] Similarly, the support groove 201 located on the semi-cylindrical part is cut along the plane containing the axis of the semi-cylindrical part, and the cross section of the support groove 201 is semi-circular; the cross section of the support groove 201 located on the cuboid part is also semi-circular, so that the support groove 201 can better match the shape of the door anti-collision bar 6 under test and adapt to various specifications of door anti-collision bars 6 under test.

[0044] Specifically, the top of the loading head 1 has a threaded hole, which is a blind hole. The loading head 1 can be threadedly connected to the loading device using the threaded hole. The threaded connection is fast and easy to install and disassemble, which helps to improve the efficiency of the testing work.

[0045] To further improve the connection stability between the loading head 1 and the loading device, the loading head 1 is also connected to a locking nut 3. The locking nut 3 is rotatably set at the threaded hole. After the loading head 1 and the loading device are threadedly connected, the locking nut 3 can be threadedly connected to the loading device to lock the loading head 1 and the loading device, ensuring the smooth progress of the loading test process.

[0046] In practical applications, the arc surfaces of the loading groove 101 and the supporting groove 201 can be set to match the outer circumferential surface of the door anti-collision bar 6 under test, so as to meet the testing requirements of the door anti-collision bar 6 under test with specific specifications.

[0047] The present invention provides a three-point bend test fixture for car door anti-collision bars, which also includes a base 4. The base 4 is located at the bottom of the support block 2 and the two correspond one-to-one. The base 4 can be connected to the workbench. The support block 2 is connected to the workbench through the base 4 to ensure the stability of the test fixture during the test.

[0048] In this specific embodiment, the base 4 and the support block 2 are connected by a positioning pin, which provides positioning for the connection between the base 4 and the support block 2 and ensures the accuracy of the connection. Both the base 4 and the support block 2 have pin holes 5 that are adapted to the positioning pins. In this specific embodiment, there are two sets of positioning pins to prevent relative rotation between the base 4 and the support block 2, further ensuring the positioning accuracy of the connection.

[0049] To further ensure the firmness of the connection between the base 4 and the support block 2, the base 4 and the support block 2 are connected by screws. The base 4 has a countersunk hole 401 that matches the screws, and the support block 2 has a threaded hole that matches the screws. The screws pass through the countersunk hole 401 and are threadedly connected to the support block 2, ensuring that the bottom of the base 4 is flat and avoiding affecting the connection between the base 4 and the worktable.

[0050] More specifically, the base 4 has connecting holes 402, which allow it to be bolted to the workbench for easy assembly and disassembly, thus improving testing efficiency. The number of connecting holes 402 can be set to multiple sets to ensure the stability of the connection between the base 4 and the workbench. In this specific embodiment, there are four sets of connecting holes 402, and the line connecting the four sets of connecting holes 402 forms a rectangle, ensuring the stability of the connection between the base 4 and the workbench while improving the uniformity of force distribution on the base 4. In practical applications, the number and distribution of connecting holes 402 can be adjusted according to the specifications and type of the base 4 and the workbench.

[0051] It should also be noted that the connecting hole 402 is an oblong hole, and the length direction of the connecting hole 402 is parallel to the line connecting the two support blocks 2. When the base 4 is connected to the workbench, the position of the base 4 can be finely adjusted using the connecting hole 402, reducing the difficulty of installation. At the same time, it helps the base 4 to adapt to different types of workbenches, further improving the flexibility and adaptability of the testing fixture.

[0052] It should be noted that the workbench can be the installation location of the test fixture, a test bench, or a loading device, etc. It is common practice for those skilled in the art to reasonably select the workbench to meet the loading test requirements, and will not be elaborated here.

[0053] When using the three-point bend test fixture for car door anti-collision bars of this utility model, after the base 4 and support block 2 are assembled, they are fixed to the workbench with bolts. The distance between the two bases 4 is adjusted according to the length of the car door anti-collision bar 6 to be tested and the test requirements. The car door anti-collision bar 6 to be tested is placed on the two support blocks 2, with both sides extending at the same length. The loading head 1 is assembled onto the loading device, the angle is adjusted, and the loading groove 101 of the loading head 1 contacts the car door anti-collision bar 6 to be tested. The loading head 1 and the loading device are then locked together using the locking nut 3.

[0054] The testing fixture of this invention utilizes the loading groove 101 and the support groove 201 to fit against the door anti-collision bar 6 under test, thus accommodating door anti-collision bars 6 of different specifications and sizes, improving the adaptability of the testing fixture. The connecting hole 402 of the base 4 is an elongated hole, which improves the adaptability of the testing fixture to different types of workbenches and ensures the stability of the testing fixture. In addition, the base 4 and the support block 2 adopt separate structures, reducing the amount of processing work for the testing fixture and lowering the processing and use costs of the testing fixture.

[0055] Example 2

[0056] This embodiment provides a three-point bend test system suitable for car door anti-collision bars, including a loading device and a three-point bend test fixture suitable for car door anti-collision bars according to Embodiment 1. The loading device is a hydraulic rod, which is threadedly connected to the loading head 1.

[0057] In practical applications, other types of loading devices can be selected according to testing requirements to meet different testing conditions.

[0058] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A three-point bend test fixture suitable for vehicle door anti-collision bars, characterized in that, include: A loading head, which can be connected to a loading device, which can drive the loading head to move in order to load the door anti-collision bar under test, and the loading head has a loading groove that can contact the door anti-collision bar under test; The support blocks are in two sets, with the two support blocks located on both sides of the loading head and below the loading head. The support blocks can be fixed on the worktable, and the support blocks have support grooves that can contact the anti-collision bar of the door to be tested. Both the loading groove and the supporting groove are arc-shaped grooves; In a plane perpendicular to the direction of movement of the loading head, the center lines of the projections of the loading groove and the two supporting grooves coincide.

2. The three-point bend test fixture for vehicle door anti-collision bars according to claim 1, characterized in that: The loading head has a semi-cylindrical structure, and the loading groove is located on the outer peripheral surface of the loading head and is arranged around the axis of the loading head; The loading groove is cut along the plane containing the axis of the loading head, and the cross-section of the loading groove is semi-circular.

3. The three-point bend test fixture for vehicle door anti-collision bars according to claim 2, characterized in that: The support block includes a semi-cylindrical part and a cuboid part. The semi-cylindrical part is disposed on the top of the cuboid part and the two are connected. The axis of the semi-cylindrical part is parallel to the axis of the loading head. The support groove is located on the outer peripheral surface of the semi-cylindrical part and extends to the opposite two sides of the cuboid part. The support groove located on the semi-cylindrical portion is cut along the plane containing the axis of the semi-cylindrical portion, and the cross-section of the support groove is semi-circular; the cross-section of the support groove located on the cuboid portion is also semi-circular.

4. The three-point bend test fixture for vehicle door anti-collision bars according to claim 1, characterized in that: The top of the loading head has a threaded hole, which is a blind hole, and the loading head can be threadedly connected to the loading device using the threaded hole.

5. The three-point bend test fixture for vehicle door anti-collision bars according to claim 4, characterized in that: The loading head is also connected to a locking nut, which is rotatably disposed at the threaded hole. After the loading head is threadedly connected to the loading device, the locking nut can be threadedly connected to the loading device to lock the loading head and the loading device.

6. The three-point bend test fixture for vehicle door anti-collision bars according to any one of claims 1-5, characterized in that: The arc surfaces of the loading groove and the supporting groove are both matched with the outer peripheral surface of the door anti-collision bar under test.

7. The three-point bend test fixture for vehicle door anti-collision bars according to any one of claims 1-5, characterized in that: It also includes a base, which is disposed at the bottom of the support block and the two correspond one-to-one, and the base can be connected to the workbench.

8. The three-point bend test fixture for vehicle door anti-collision bars according to claim 7, characterized in that: The base and the support block are connected by a positioning pin. The number of positioning pins is two sets.

9. The three-point bend test fixture for vehicle door anti-collision bars according to claim 7, characterized in that: The base and the support block are connected by screws. The base has a countersunk hole that matches the screw, and the support block has a threaded hole that matches the screw.

10. The three-point bend test fixture for vehicle door anti-collision bars according to claim 7, characterized in that: The base has connecting holes, which allow it to be bolted to the workbench; there are multiple sets of connecting holes. The connecting hole is an oblong hole, and the length direction of the connecting hole is parallel to the line connecting the two support blocks.

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