Small automobile bumper safety performance detection device

Abstract

The utility model provides a safety performance detection device for a small automobile bumper, and belongs to the technical field of safety evaluation and detection of automobile bumpers. The device comprises a base, a support, a positioning pin, a T-shaped sliding device, a pressure sensor and a deflectometer, wherein the base is fixed on a workbench of a press machine through the positioning pin; a T-shaped guide rail is installed on the base, two matched T-shaped sliding plates are installed on the T-shaped guide rail, a support is installed on each T-shaped sliding plate, and stand columns at the two ends of an automobile bumper are fixed to the supports through bolts respectively. Wherein the base and the support adopt a ribbed box type structure, and the sliding fit between the T-shaped guide rail and the T-shaped sliding plate is beneficial to free sliding of the bumper during detection. The device can be used for carrying out bearing capacity detection, deflection measurement and welding spot cracking condition detection on small automobile bumpers of different specifications and different sizes. The device is simple in structure, and the method is easy to implement.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile bumper safety evaluation and detection, in particular to a small automobile bumper safety performance detection device. Background Art

[0002] The car bumper is an important component of the car body. It is a safety device that absorbs and reduces external impact and protects the front and rear of the car body. It has the functions of buffering collision impact, protecting the vehicle and its occupants, and decorating the vehicle.

[0003] The ability to resist bending deformation is an important indicator of the anti-collision performance of automobile bumpers. If a larger bending angle and a larger bending force can be withstood during a collision, better safety protection can be provided to the vehicle and the occupants. In addition, the safety performance of automobile bumpers also involves the deflection of the bumper bar, the welding quality of the structure, etc. At present, the literature mainly tests the bending limit performance of the bumper, and does not involve the detection of other performances. For this reason, the utility model takes the statically indeterminate structure of the automobile bumper as the starting point and the three-point bending form as the basic principle, and designs a small automobile bumper safety performance detection device, which is easy to implement. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a small automobile bumper safety performance detection device which can be suitable for the testing requirements of small automobile bumpers of different specifications and sizes.

[0005] The device includes a base, a support, a positioning pin, a T-shaped sliding device, a pressure sensor and a deflection meter;

[0006] A positioning pin is installed at the middle lower part of the base, and the base is fixed to the lower cross joint of the press through the positioning pin;

[0007] A T-shaped sliding device is installed on the base, and its function is to provide sliding freedom to the bumper column when the bumper is pressed down and displaced to a large extent, and a support is installed on the T-shaped sliding device;

[0008] The columns at both ends of the automobile bumper are fixed to the supports by bolts respectively;

[0009] The deflectometer is fixed on a deflectometer mounting frame, and the deflectometer mounting frame is fixed on the upper surface of the base, ensuring that the deflectometer probe contacts the middle lower surface of the automobile bumper, and is used to measure the deflection displacement of the bumper contact point during the test;

[0010] The pressure sensor is fixedly mounted on the upper cross joint of the press and is used to test the bending load of the bumper.

[0011] The T-shaped sliding device is composed of a T-shaped guide rail and a T-shaped slide plate. The T-shaped guide rail is installed on the base by bolts. There are two T-shaped slide plates, which are matched and installed on the T-shaped guide rail. A support is fixed on each T-shaped slide plate by bolts.

[0012] The base and the support both adopt a ribbed box structure, and the base and the support are combined together through a T-shaped sliding device. The sliding fit between the T-shaped guide rail and the T-shaped slide plate through the T-shaped slot can facilitate the free sliding of the bumper column during the detection process. The ribbed box structure has high rigidity and is used to install and support the test vehicle bumper.

[0013] The surface of the box-type support is provided with mounting holes matching with the automobile bumper pillars, the diameter of the holes is 14 mm, and the bottom plate of the automobile bumper pillar is fixed to the box-type support by bolt connection.

[0014] The base is a symmetrical structure, and the front, rear, upper and lower surfaces, reinforced ribs and both end surfaces of the base are made of 10mm thick steel plates.

[0015] The beneficial effects of the above technical solution of the utility model are as follows:

[0016] The above scheme takes the statically indeterminate structure of the automobile bumper as the starting point and the three-point bending form as the basic principle. The device can test the ultimate bending resistance of small automobile bumpers of different specifications and sizes, judge the stiffness and load-bearing capacity of the bumper by the deflection under the same load conditions, and test the cracking of the weld. The device has a simple structure and the method is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the small car bumper safety performance testing device of the utility model;

[0018] Figure 2 This is a side view of the small car bumper safety performance testing device of the utility model;

[0019] Figure 3 This is a top view of the base of the small automobile bumper safety performance testing device of the utility model;

[0020] Figure 4 The utility model is a front view of the base of a small automobile bumper safety performance testing device.

[0021] Among them: 1- positioning pin; 2- base; 3- T-type guide rail; 4- T-type slide plate; 5- support; 6- pressure sensor; 7- car bumper; 8- deflection meter. DETAILED DESCRIPTION

[0022] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0023] The utility model provides a small automobile bumper safety performance detection device.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the device includes a positioning pin 1, a base 2, a T-shaped guide rail 3, a T-shaped slide plate 4, a support 5, a pressure sensor 6 and a deflection meter 8;

[0025] A positioning pin 1 is installed at the middle lower part of the base 2, and the base 2 is fixed to the lower cross joint of the press through the positioning pin 1;

[0026] A T-shaped sliding device is installed on the base 2, and a support 5 is installed on the T-shaped sliding device;

[0027] The columns at both ends of the automobile bumper 7 are fixed to the support 5 by bolts respectively;

[0028] The deflectometer 8 is fixed on a deflectometer mounting frame, and the deflectometer mounting frame is fixed on the upper surface of the base to ensure that the deflectometer probe is in contact with the middle lower surface of the automobile bumper;

[0029] The pressure sensor 6 is fixedly mounted on the upper cross joint of the press.

[0030] The T-shaped sliding device is composed of a T-shaped guide rail 3 and a T-shaped slide plate 4. The T-shaped guide rail 3 is installed on the base 2 by bolts. There are two T-shaped slide plates 4. The two T-shaped slide plates 4 are matched and installed on the T-shaped guide rail 3. A support 5 is fixed on each T-shaped slide plate 4 by bolts.

[0031] The base 2 and the support 5 adopt a ribbed box structure, and the box support 5 is installed on the base 2 by means of a T-shaped guide rail 3 and a T-shaped slide plate 4 using screws;

[0032] The sliding fit between the T-shaped guide rail 3 and the T-shaped slide plate 4 through the T-shaped groove can facilitate the free sliding of the bumper column during the detection process.

[0033] The surface of the box-type support is provided with mounting holes matching with the automobile bumper pillars, the diameter of the holes is 14 mm, and the bottom plate of the automobile bumper pillar is fixed to the box-type support by bolt connection.

[0034] The base is a symmetrical structure, and the front, rear, upper and lower surfaces, reinforced ribs and both end surfaces of the base are made of 10mm thick steel plates.

[0035] In specific applications, the method is as follows:

[0036] 1) Measure the ultimate load-bearing capacity of the bumper. Directly apply downward pressure to the middle part of the bumper through the pressure sensor according to the downward pressure speed required by the test, and stop when the real-time load-displacement curve drops to the specified requirement. Record the maximum load and the corresponding downward pressure displacement during the load application process. The maximum load is the ultimate load of the bumper. If the loading speed is a static speed, the impact load-bearing capacity of the bumper can be calculated by multiplying the dynamic load coefficient by the static load limit load.

[0037] 2) The basis for judging the stiffness and bearing capacity of the bumper. Install the deflection meter 8 and load it at a static load speed. When the deflection meter 8 reaches a certain fixed required value, record the bearing capacity under the deflection. The bearing capacity of different bumpers is different. The load required for the midpoint deflection of the bumper to reach a fixed value in the bending test is also different. When the bearing capacity is greater than the required value of the fixed deflection value, it can be judged that the bumper is of qualified quality, otherwise it is an unqualified bumper. It is also possible to load a fixed load on the bumper and measure the deflection displacement with a deflection meter. When the deflection displacement is less than the required value, it can be judged that the bumper is of qualified quality, otherwise it is an unqualified bumper. This method can be measured within the elastic range of the bumper without damaging the bumper. It is a good way to detect the quality of the bumper.

[0038] 3) Check the welding condition between the bumper and the pillar. Similarly, by loading the bumper in the form of three-point bending, during the loading process, as the displacement of the middle part of the bumper beam continues to increase, the weld between the beam and the bumper may crack. During the loading process, the downward displacement is large, and due to the existence of the T-shaped structure, the bumper pillar may slide to both sides, which can better reflect the welding strength between the pillar and the bumper. Whether the weld is cracked and the amount of cracking time at the same loading speed can also be used to judge whether the quality of the bumper is qualified.

[0039] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A small car bumper safety performance testing device, characterized in that: It includes a base, a support, a positioning pin, a T-type slide, a pressure sensor and a deflection meter; A positioning pin is installed at the middle lower part of the base, and the base is fixed to the lower cross joint of the press through the positioning pin; A T-shaped sliding device is installed on the base, and a support is installed on the T-shaped sliding device; The columns at both ends of the automobile bumper are fixed to the supports by bolts respectively; The deflectometer is fixed on a deflectometer mounting frame, and the deflectometer mounting frame is fixed on the upper surface of the base, ensuring that the deflectometer probe contacts the middle lower surface of the automobile bumper; The pressure sensor is fixedly mounted on the upper cross joint of the press and is used to test the bending load of the bumper.

2. The small car bumper safety performance testing device according to claim 1 is characterized in that: The T-shaped sliding device is composed of a T-shaped guide rail and a T-shaped slide plate. The T-shaped guide rail is installed on the base by bolts. There are two T-shaped slide plates, which are matched and installed on the T-shaped guide rail. A support is fixed on each T-shaped slide plate by bolts.

3. The small car bumper safety performance testing device according to claim 1 is characterized in that: The base and the support both adopt a ribbed box structure, and the base and the support are combined together through a T-shaped sliding device.

4. The small car bumper safety performance testing device according to claim 1 is characterized in that: The surface of the support is provided with mounting holes matching with the automobile bumper pillars, the diameter of the holes is 14 mm, and the bottom plate of the automobile bumper pillar is fixed to the support by bolts.

5. The small car bumper safety performance testing device according to claim 3 is characterized in that: The base is a symmetrical structure, and the front and rear upper and lower surfaces, the reinforced ribs, and the surfaces at both ends of the base are all made of 10mm thick steel plates.

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