Three-point bending test device for car door anti-collision beam

Abstract

This utility model relates to the field of vehicle door anti-collision beam technology, and more particularly to a three-point bending test device for a vehicle door anti-collision beam, comprising: a support, a first fixing block, a second fixing block, a first support assembly, a second support assembly, and a pressure head. The first fixing block and the second fixing block are respectively connected to both ends of the vehicle door anti-collision beam, forming an integrated anti-collision beam structure; the top of the first support assembly and the second support assembly are respectively provided with a first arc portion and a second arc portion; the integrated anti-collision beam structure is disposed on the first support assembly and the second support assembly. When the press drives the pressure head to apply a load to the center of the vehicle door anti-collision beam, the first fixing block and the second fixing block rotate around the contact point of the first arc portion and the second arc portion as the rotation fulcrum. The advantage of this utility model is that, since the axial height of the first support assembly and the second support assembly can be adjusted independently, it is possible to achieve a test where the support points on both sides of the vehicle door anti-collision beam are not at the same height.

Description

Technical Field

[0001] This utility model relates to the field of vehicle door anti-collision beam technology, and in particular to a three-point bending test device for vehicle door anti-collision beam. Background Technology

[0002] To meet the C-NCAP (China New Car Assessment Program) side pole impact requirements, door impact beams must possess sufficient rigidity and strength. Under three-point bending conditions, i.e., within a certain deformation range, the door impact beam needs to withstand a significant load. Therefore, during vehicle development, the door impact beam is typically fixed to tooling on both sides, and then a cylinder is allowed to move downwards from its midpoint to impact the door impact beam until the peak force is reached and it begins to descend, at which point the cylinder stops moving.

[0003] During the design process, in order to improve the rigidity and strength of the door impact beam, many reinforcing ribs are often set on its structural surface. This causes the mounting points on the vehicle body to be out of plane, and the side pole impact point is not at the midpoint of the door impact beam, making it difficult to conduct a three-point bending test on the door impact beam.

[0004] Currently, most existing patents describe testing devices for car door anti-collision beams based on the premise that the support points on both sides of the anti-collision beam are at the same height, i.e., the anti-collision beam is regular. For example, Chinese Patent Publication No. CN209858225U, published on December 27, 2019, entitled "A Three-Point Bending Test Bracket for Car Door Anti-collision Beams," discloses a structure in which the car door anti-collision beam to be tested is placed on the upper ends of the left and right supports. However, this structure cannot be implemented when the support points on both sides of the anti-collision beam are not at the same height. Utility Model Content

[0005] In view of this, the present invention aims to provide a three-point bending test device for a car door anti-collision beam. The axial height of both the first and second support components can be independently adjusted, enabling testing where the support points on both sides of the car door anti-collision beam are not at the same height. Furthermore, the tops of the first and second support components are respectively provided with a first arcuate portion and a second arcuate portion. This allows the first and second fixing blocks to rotate around the contact point of the first and second arcuate portions as a fulcrum. Therefore, the car door anti-collision beam will not detach from the test device when it undergoes significant bending deformation.

[0006] To achieve the above objectives, the technical solution created by this utility model is as follows: A three-point bending test device for a car door anti-collision beam includes: a support; a first fixing block and a second fixing block, the first fixing block and the second fixing block being connected to both ends of the car door anti-collision beam respectively, forming an integrated structure of the anti-collision beam; a first support component and a second support component, the first support component and the second support component being spaced apart on the support, and the axial height of the first support component and the second support component being independently adjustable; a first arc portion is provided on the top of the first support component, and a second arc portion is provided on the top of the second support component; the integrated structure of the anti-collision beam is provided on the first support component and the second support component, and abuts against the top of the first arc portion and the second arc portion; two opposite sides of the first fixing block and the second fixing block abut against the outer peripheral surfaces of the first arc portion and the second arc portion respectively; a pressure head, the pressure head being connected to the moving end of the test press and located above the car door anti-collision beam; when the press drives the pressure head to apply a load to the center of the car door anti-collision beam, the first fixing block and the second fixing block rotate around the contact point of the first arc portion and the second arc portion respectively as the rotation fulcrum.

[0007] Furthermore, the thickness of the first fixing block is not equal to the thickness of the second fixing block.

[0008] Furthermore, the left and right ends of the door anti-collision beam have a height difference, with the thicker fixing block connected to the higher end of the door anti-collision beam and the thinner fixing block connected to the lower end of the door anti-collision beam.

[0009] Furthermore, the first support assembly and the second support assembly have the same structure and are installed on the support opposite to each other; the first support assembly includes a first support frame and a first support block; the first support frame includes a first movable plate and a first support plate vertically disposed on the first movable plate; the first support block includes a first mounting part and a first support part; the first mounting part is inverted L-shaped, and its long side is connected to the support plate; the first support part is connected to the end of the short side of the first mounting part, and a first arc part is disposed at the top of the first support part.

[0010] Furthermore, a first elongated hole is provided on the surface where the long side of the first mounting part is located, for adjusting the height of the first support block.

[0011] Furthermore, the second support component includes a second support frame with the same structure as the first support frame and a second support block with the same structure as the first support block; the second arc portion is disposed at the top of the second support block.

[0012] Furthermore, the support is provided with a T-slot along its length, and the first support component and the second support component are slidably disposed in the T-slot.

[0013] Furthermore, the surface roughness of the first fixing block and the second fixing block is less than or equal to 6.3 μm; the surface roughness of the first support component and the second support component is less than or equal to 3.2 μm.

[0014] Furthermore, the coefficient of friction between the first fixed block and the first arc portion and the coefficient of friction between the second fixed block and the second arc portion are both 0.18~0.2.

[0015] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0016] 1) Since the axial height of the first support component and the second support component can be adjusted independently, it is possible to conduct tests in which the support points on both sides of the door anti-collision beam are not at the same height.

[0017] 2) The top of the first support assembly and the top of the second support assembly are respectively provided with a first arc portion and a second arc portion. This allows the first fixing block and the second fixing block to rotate around the contact point of the first arc portion and the second arc portion as the fulcrum. Therefore, when the door anti-collision beam undergoes large bending deformation, it will not fall off the test device.

[0018] 3) The support is provided with a T-slot, and the first support assembly and the second support assembly are slidably disposed within the T-slot. This allows the distance between the first support assembly and the second support assembly to be adjustable, thereby achieving the optimal support position for the door anti-collision beam.

[0019] 4) By setting the friction coefficient between the first fixed block and the first arc portion and the friction coefficient between the second fixed block and the second arc portion, it is further ensured that the door anti-collision beam can be stably held on the test device and will not fall off when large bending deformation occurs. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of this invention. The illustrative embodiments and descriptions of this invention are used to explain this invention and do not constitute an undue limitation of this invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the three-point bending test device for the car door anti-collision beam provided according to an embodiment of the present utility model;

[0022] Figure 2 This is a structural schematic diagram of the support provided according to an embodiment of the present utility model;

[0023] Figure 3 This is a structural schematic diagram of the first support component provided according to an embodiment of the present utility model;

[0024] Figure 4This is a structural schematic diagram of the second support component provided according to an embodiment of the present utility model.

[0025] The reference numerals in the attached drawings include: 1. Support; 11. T-slot; 2. First fixing block; 3. Second fixing block; 4. First support assembly; 41. First support frame; 42. First support block; 421. First mounting part; 422. First support part; 423. First arc part; 424. First clearance space; 5. Second support assembly; 51. Second support frame; 52. Second support block; 521. Second mounting part; 522. Second support part; 523. Second arc part; 524. Second clearance space; 53. Second arc part; 6. Pressure head; 7. Door anti-collision beam. Detailed Implementation

[0026] To make the purpose, technical solution, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and do not constitute a limitation thereof.

[0027] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] like Figures 1 to 3 As shown in the figure, an embodiment of this utility model provides a three-point bending test device for a car door anti-collision beam, comprising: a support 1, a first fixing block 2, a second fixing block 3, a first support assembly 4, a second support assembly 5, and a pressure head 6. The first fixing block 2 and the second fixing block 3 are respectively connected to both ends of the car door anti-collision beam 7, forming an integrated structure of the anti-collision beam. The first support assembly 4 and the second support assembly 5 are arranged at adjustable intervals on the support 1, and the axial height of the first support assembly 4 and the second support assembly 5 can be adjusted independently. The top of the first support assembly 4 is provided with a first arc portion 423, and the top of the second support assembly 5 is provided with a second arc portion 523.

[0032] The integrated anti-collision beam structure is mounted on the first support component 4 and the second support component 5, and abuts against the tops of the first arc portion 423 and the second arc portion 523. The two opposite sides of the first fixing block 2 and the second fixing block 3 abut against the outer peripheral surfaces of the first arc portion 423 and the second arc portion 523, respectively. The pressure head 6 is connected to the moving end of the test press and is located above the door anti-collision beam 7. When the press drives the pressure head 6 to apply a load to the center of the door anti-collision beam 7, the first fixing block 2 and the second fixing block 3 rotate around the contact point of the first arc portion 423 and the second arc portion 523, respectively. The pressure head 6, through the press, applies pressure to the door anti-collision beam 7, and the impact resistance of the door anti-collision beam 7 is evaluated by detecting the surface quality of the door anti-collision beam 7 after bending or collecting the deformation force during the deformation process. In this embodiment, the cross-section of the pressure head 6 is semi-circular.

[0033] It should be noted that the aforementioned press and its moving end are not fundamentally different from existing presses; their structure and principle are similar. Their main function is to drive the pressure head 6 downwards, causing it to collide with the door anti-collision beam 7. This allows for quantitative analysis of the collision force and energy absorption characteristics of the door anti-collision beam 7 under collision conditions, providing data support for research and development. The pressing speed and applied pressure can be adjusted according to actual testing requirements.

[0034] The support 1 is provided with a T-slot 11, which extends along the length of the support 1. The first support assembly 4 and the second support assembly 5 are slidably disposed within the T-slot 11. This allows the distance between the first support assembly 4 and the second support assembly 5 to be adjustable, thereby achieving the optimal support position for the door anti-collision beam 7.

[0035] The first support assembly 4 and the second support assembly 5 have the same structure and are installed opposite to each other on the support 1. The first support assembly 4 includes a first support frame 41 and a first support block 42. The first support frame 41 includes a first movable plate and a first support plate vertically disposed on the first movable plate. The first movable plate is slidably disposed in the T-slot 11, and the first support plate is provided with a first connecting hole for connecting with the first support block 42.

[0036] The first support block 42 includes a first mounting portion 421 and a first support portion 422. The first mounting portion 421 is inverted L-shaped, and an elongated hole is provided on the surface where the long side of the first mounting portion 421 is located, for connecting with the support plate and adjusting the height of the first support block 42. The first support portion 422 is connected to the end of the short side of the first mounting portion 421, and a first arc portion 423 is provided at the top of the first support portion 422. A first clearance space 424 is also formed between the first support portion 422 and the first mounting portion 421. The first clearance space 424 is located above the first mounting portion 421 and is used to accommodate the first fixing block 2, and the height of the first clearance space 424 is greater than the thickness of the first fixing block 2.

[0037] The second support assembly 5 includes a second support frame 51 and a second support block 52. The second support frame 51 has the same structure as the first support frame 41, and the second support block 52 has the same structure as the first support block 42. Specifically, the second support frame 51 includes a second movable plate and a second support plate vertically disposed on the second movable plate. The second movable plate is slidably disposed in the T-slot 11, and the second support plate is provided with a second connecting hole for connecting with the second support block 52.

[0038] The second support block 52 includes a second mounting portion 521 and a second support portion 522. The second mounting portion 521 is inverted L-shaped and is positioned opposite to the first mounting portion 421. The second support portion 522 is also positioned opposite to the first support portion 422. A second elongated hole is provided on the long side of the second mounting portion 521 for connecting to the second support plate and adjusting the height of the second support block 52. The second support portion 522 is connected to the second mounting portion 521, and a second arcuate portion 523 is provided at the top of the second support portion 522. A second clearance space 524 is also formed between the second support portion 522 and the second mounting portion 521. The second clearance space 524 is located above the second mounting portion 521 and is used to accommodate the second fixing block 3. The height of the second clearance space 524 is greater than the thickness of the second fixing block 3.

[0039] The top of the first support assembly 4 and the top of the second support assembly 5 are respectively provided with a first arcuate portion 423 and a second arcuate portion 523. This allows the first fixing block 2 and the second fixing block 3 to rotate around the contact point of the first arcuate portion 423 and the second arcuate portion 523 as the fulcrum. Therefore, the door anti-collision beam 7 will not fall off the test device when it undergoes large bending deformation. At the same time, since the axial height of the first support assembly 4 and the second support assembly 5 can be adjusted independently, tests can be conducted where the fulcrums on both sides of the door anti-collision beam 7 are not at the same height.

[0040] Because of the height difference between the two ends of the door anti-collision beam 7, the thicknesses of the first fixing block 2 and the second fixing block 3 are unequal. In this embodiment, the right end of the door anti-collision beam 7 is higher than the left end, and the thickness of the second fixing block 3 is greater than the thickness of the first fixing block 2. The first fixing block 2 is connected to the left end of the door anti-collision beam 7, and the second fixing block 3 is connected to the right end of the door anti-collision beam 7. The thickness difference design of the first fixing block 2 and the second fixing block 3 can eliminate the additional bending moment caused by the height difference between the two ends of the door anti-collision beam 7, ensure that the test load is symmetrically distributed along the door anti-collision beam 7, and avoid generating unexpected shear stress.

[0041] In this embodiment, the surface roughness of the first fixing block 2 and the second fixing block 3 is less than or equal to 6.3 μm. The surface roughness of the first support component 4 and the second support component 5 is less than or equal to 3.2 μm. The coefficient of friction between the first fixing block 2 and the first arc portion 423, and between the second fixing block 3 and the second arc portion 523, are both 0.18 to 0.2. By setting the coefficient of friction, it is further ensured that the door anti-collision beam 7 can be stably held on the test device and will not fall off when large bending deformation occurs. It should be noted that if the coefficient of friction exceeds this range, the pressure head 6 may slip laterally during the test, causing the bending test to fail to be completed smoothly.

[0042] The following description, with reference to the attached diagram, describes the test procedure of the three-point bending test device for the car door anti-collision beam:

[0043] The first fixing block 2 and the second fixing block 3 are connected to both ends of the door anti-collision beam 7 to form an integrated anti-collision beam structure. The integrated anti-collision beam structure is then mounted on the first support assembly 4 and the second support assembly 5. The height of the first mounting part 421 or the second mounting part 521 is adjusted so that the height of the first support block 42 and the second support block 52 matches the height of the left and right ends of the door anti-collision beam 7 in its natural state. The distance between the first support assembly 4 and the second support assembly 5 is adjusted so that the two opposite sides of the first fixing block 2 and the second fixing block 3 abut against the outer peripheral surfaces of the first arc portion 423 and the second arc portion 523, respectively. The press drives the pressure head 6 to apply a load to the center of the door anti-collision beam 7. At this time, the first fixing block 2 and the second fixing block 3 rotate around the contact point of the first arc portion 423 and the second arc portion 523, respectively.

[0044] During testing, the pressure head 6, driven by the press, descends at a speed of 10 mm / min, with a pressing distance of 180 mm. The pressing distance can be determined according to customer requirements. After testing, the force output by the testing machine can be used to evaluate the impact resistance of the anti-collision beam.

[0045] In summary, this testing device does not require vehicle assembly and can test the collision characteristics of the door anti-collision beam 7, making the testing convenient and quick. It can also quantitatively analyze the collision force and energy absorption characteristics of the door anti-collision beam 7, providing a basis for research and development and improvement.

[0046] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A three-point bending test device for a car door anti-collision beam, characterized in that, include: Support; The first fixing block and the second fixing block are respectively connected to both ends of the door anti-collision beam to form an integrated structure of the anti-collision beam; A first support component and a second support component are spaced apart on the support, and the axial height of the first support component and the second support component can be adjusted independently; the top of the first support component is provided with a first arc portion, and the top of the second support component is provided with a second arc portion. An integrated anti-collision beam structure is disposed on the first support component and the second support component, and abuts against the top of the first arc portion and the second arc portion; the two opposite sides of the first fixing block and the second fixing block abut against the outer peripheral surfaces of the first arc portion and the second arc portion, respectively; The pressure head is connected to the moving end of the test press and is located above the door anti-collision beam; When the press drives the pressure head to apply a load to the center of the door anti-collision beam, the first fixed block and the second fixed block rotate around the contact point of the first arc portion and the second arc portion, respectively.

2. The three-point bending test device for the car door anti-collision beam according to claim 1, characterized in that, The thickness of the first fixing block is different from the thickness of the second fixing block.

3. The three-point bending test device for the door anti-collision beam according to claim 2, characterized in that, The door anti-collision beam has a height difference between its left and right ends, with the thicker fixing block connected to the higher end of the door anti-collision beam and the thinner fixing block connected to the lower end of the door anti-collision beam.

4. The three-point bending test device for the door anti-collision beam according to claim 1, characterized in that, The first support component and the second support component have the same structure and are installed on the support opposite to each other; the first support component includes a first support frame and a first support block; The first support frame includes a first movable plate and a first support plate vertically disposed on the first movable plate; The first support block includes a first mounting part and a first support part; the first mounting part is inverted L-shaped, and its long side is connected to the first support plate; the first support part is connected to the end of the short side of the first mounting part, and the first arc part is disposed at the top of the first support part.

5. The three-point bending test device for the door anti-collision beam according to claim 4, characterized in that, The long side of the first mounting part is provided with a first elongated hole for adjusting the height of the first support block.

6. The three-point bending test device for the door anti-collision beam according to claim 4, characterized in that, The second support component includes a second support frame with the same structure as the first support frame and a second support block with the same structure as the first support block; the second arc portion is disposed at the top of the second support block.

7. The three-point bending test device for the door anti-collision beam according to claim 1, characterized in that, The support has a T-shaped groove along its length, and the first support component and the second support component are slidably disposed in the T-shaped groove.

8. The three-point bending test device for the car door anti-collision beam according to claim 1, characterized in that, The surface roughness of the first fixing block and the second fixing block is less than or equal to 6.3 μm; the surface roughness of the first support component and the second support component is less than or equal to 3.2 μm.

9. The three-point bending test device for the door anti-collision beam according to claim 8, characterized in that, The coefficient of friction between the first fixed block and the first arc portion and the coefficient of friction between the second fixed block and the second arc portion are both 0.18~0.2.

Images