Auxiliary device for axial crushing energy absorption test

Abstract

The utility model relates to an auxiliary device for an axial crushing energy absorption test. The auxiliary device comprises a supporting frame, a guide rail, a guide rail matched sliding block, a displacement sensor, a sample top plate, a sample bottom plate, a bottom fastening strip, a bottom supporting block, a protruding rectangular block, a sensor fixing mechanism, a spring clamping plate, a sample positioning pin and a guide rail pulley. The device is matched with a double-cap-shaped beam structure sample, and the hammer head is in direct contact with a steel plate placed at the top of the double-cap-shaped beam structure sample during a test, so that the stress is uniform. The displacement sensor is hidden in the supporting frame and is not prone to being damaged. According to the double-cap beam structure sample, the sample and the bottom plate are fixedly connected in a welded mode, the bottom plate and the bottom supporting block are fixedly connected through a fixing strip type bolt, firmness is high, and the sample is not prone to being damaged. The device is high in crushing stability in an actual test, and the sample is not easy to deflect, so that the drop hammer test effect and the test data accuracy are ensured.

Description

TECHNICAL FIELD

[0001] The patent application belongs to the technical field of metal material performance test, and more particularly to an auxiliary device for axial crushing energy absorption test. BACKGROUND

[0002] Automobile safety is increasingly valued by the industry development, and the lightweight design for energy saving and emission reduction becomes a new direction of automobile development. The lightweight design must ensure that the collision energy absorption characteristics of the parts are unchanged or slightly improved when the material of the parts changes or the thickness is reduced and the strength is improved. Therefore, it is of great significance to study the energy absorption characteristics and collision crushing characteristics of the material. The load-bearing members on the main collision force transmission path of the automobile body, such as front and rear longitudinal beams, B-pillars, door sills, A-pillars, etc., are all hat beam structures. Therefore, the axial crushing energy absorption test of the hat beam is an effective means to study the collision energy absorption characteristics of the material.

[0003] The axial crushing energy absorption test of the hat beam is to make the material into a standard hat beam specimen, and obtain the energy absorption characteristics and collision crushing dynamic characteristics of the material under the action of a high-speed impact drop hammer. The test mainly uses a drop hammer crushing test machine. A drop hammer of a certain weight is lifted to a sufficient height. The impact force of the free fall will crush the hat beam fixed on the fixture platform. The changes of force and displacement are obtained through a high-speed camera, a pressure sensor and a displacement sensor, so as to realize the test of the energy absorption characteristics of the material.

[0004] At present, during the test, the drop hammer needs to be free-falling to achieve high-speed impact. When the drop hammer directly contacts the specimen, the specimen may be inclined and oscillated, which affects the collection of test data and the accuracy of test results. Patent CN207147876U discloses a clamp for hat beam crushing energy absorption test. The hat beam specimen is a single hat beam, which is fixed on a specimen supporting plate. Due to the small cross-sectional area and poor symmetry of the single hat beam, the crushing stability is not high when the specimen contacts the hammer head during the actual test, and the specimen is prone to inclination, which adversely affects the test results. CONTENT OF THE UTILITY MODEL

[0005] The technical problem to be solved by the utility model is to provide an auxiliary device for axial crushing energy absorption test, which is matched with a double hat beam structure specimen, has high crushing stability during the actual test, and the specimen is not prone to inclination, so as to ensure the drop hammer test effect, the accuracy of the test results is high, and the problems in the background art are solved.

[0006] In order to solve the above problems, the technical scheme adopted by the utility model is:

[0007] An auxiliary device for axial crushing energy absorption test, comprising a frame mechanism, a displacement mechanism,

[0008] The frame mechanism comprises a bottom support block and support frames vertically arranged on both sides of the bottom support block.

[0009] The displacement mechanism comprises two guide rails arranged at intervals on each support frame, a guide rail matching sliding block slidingly matched with the gap between the two guide rails, a guide rail pulley arranged on the guide rail matching sliding block, a protruding rectangular block mounted on the guide rail matching sliding block, a sample top plate connected to the inner side of the protruding rectangular block, a displacement sensor arranged between the protruding rectangular block and the bottom surface of the support frame, a double-hat-shaped beam structure sample placed at the bottom of the sample top plate, and a sample bottom plate connected to the bottom of the double-hat-shaped beam structure sample.

[0010] Further, a plurality of spring clamping plates are arranged on the guide rail matching sliding block, and the spring clamping plates press the protruding rectangular blocks on both sides of the sample top plate against the upper end of the guide rail matching sliding block.

[0011] Further, a sample positioning pin is arranged on the guide rail matching sliding block, and the sample positioning pin is located at the rear side of the spring clamping plate and / or the side edge of the protruding rectangular block.

[0012] Further, the displacement sensor is connected to the protruding rectangular blocks on both sides of the sample top plate through a sensor fixing mechanism, and a universal shaft is further arranged below the sensor fixing mechanism, and the other end of the universal shaft is connected to the bottom surface of the support frame.

[0013] Further, the sample bottom plate is fixed to the support block through a bottom fastening strip.

[0014] Further, the sample top plate and the protruding rectangular block are integrally formed.

[0015] Further, the frame mechanism (the bottom support block and the support frame) is fastened and connected to the external ground or plane in the form of foundation bolts.

[0016] Further, the rectangular sample bottom plate is welded at the bottom of the double-hat-shaped beam structure sample, and the sample top plate is placed on the top of the double-hat-shaped beam structure sample, and the two are not connected in any form such as welding or cementing.

[0017] Thanks to the above technical solutions, the present application has the following advantages:

[0018] 1) The device is simple and easy to manufacture.

[0019] 2) The device is matched with the double-hat-shaped beam structure sample, the cross-sectional area of the double-hat-shaped beam structure sample is large, the shape is symmetrical, and the hammer head directly contacts the steel plate placed on the top of the double-hat-shaped beam structure sample, so that the stress is uniform, the crushing stability is high during actual testing, the sample is not easy to deviate, and the drop hammer test effect and the accuracy of the test data are ensured.

[0020] 3) displacement sensor hidden in the support frame, not easy to be damaged;

[0021] 4) double hat-shaped beam structure sample, sample and bottom plate are fixed by welding connection, the bottom plate and the bottom support block are connected by fixed strip form bolt fastening, high firmness is not easy to be damaged, guarantee that the sample is not easy to occur deflection in the test process. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is overall structure schematic view of the utility model;

[0023] Figure 2 It is front view of the utility model;

[0024] Figure 3 It is top view of the utility model;

[0025] Figure 4 It is side view of the utility model;

[0026] Figure 5 It is double hat-shaped beam structure sample schematic view;

[0027] Figure 6 It is matching installation schematic view of the utility model and double hat-shaped beam structure sample;

[0028] Figure 7 It is convex rectangular block and guide rail matched slider, displacement sensor matching installation schematic view.

[0029] Wherein: support frame 1, guide rail 2, guide rail matched slider 3, displacement sensor 4, sample top plate 5, sample bottom plate 6, bottom fastening strip 7, bottom support block 8, convex rectangular block 9, double hat-shaped beam structure sample 10, sensor fixing mechanism 11, spring clamping plate 12, sample positioning pin 13, guide rail pulley 14, hammer head 15. DETAILED DESCRIPTION

[0030] The utility model will be further explained in detail in combination with examples.

[0031] A kind of auxiliary device for axial crushing energy absorption test, as shown in Figure 1 , including frame mechanism, displacement mechanism,

[0032] Frame mechanism includes bottom support block 8, support frame 1 vertically arranged in the both sides of bottom support block 8.

[0033] The displacement mechanism includes two guide rails 2 spaced apart on each support frame 1, a guide rail matching slider 3 that slides with the gap between the two guide rails 2, a guide rail pulley 14 set on the guide rail matching slider 3, a protruding rectangular block 9 installed on the guide rail matching slider 3, a sample top plate 5 connected to the inner side of the protruding rectangular block 9, a displacement sensor 4 set between the protruding rectangular block 9 and the bottom surface of the support frame 1, a double-hat-shaped beam structure sample 10 placed at the bottom of the sample top plate 5, and a sample base plate 6 connected to the bottom of the double-hat-shaped beam structure sample 10. The sample base plate 6 is fixed on the support block 8. The displacement sensor 4 is a retractable displacement sensor. The protruding rectangular block 9 is located on both sides of the sample top plate 5.

[0034] The guide rail slider 3 is also equipped with multiple spring clamps 12, which press the protruding rectangular blocks 9 on both sides of the sample top plate 5 against the upper end of the guide rail slider 3. The guide rail slider 3 is also equipped with sample positioning pins 13, located behind the spring clamps 12 and / or on the sides of the protruding rectangular blocks 9. The sample positioning pins 13 are not associated with the guide rail pulleys 14. Figure 7 In the process, there are 4 sample positioning pins 13 on each guide rail matching slider 3, including 1 on the rear side of the spring plate 12 and 3 arranged in a row on the side of the protruding rectangular block 9. The sample positioning pins 13 match the size of the sample top plate 5 and the protruding rectangular block 9 to position the sample top plate 5 and prevent the sample top plate 5 from moving up and down or left and right.

[0035] The displacement sensor 4 is connected to the protruding rectangular blocks 9 on both sides of the sample top plate 5 through the sensor fixing mechanism 11. A universal joint is also provided below the sensor fixing mechanism 11, and the other end of the universal joint is connected to the bottom surface of the support frame 1.

[0036] The sample base plate 6 is fixed to the support block 8 by the bottom fastening strip 7, and the sample top plate 5 is integrally formed with the protruding rectangular block 9.

[0037] The following is combined Figures 1-7 Detailed explanation.

[0038] This embodiment provides an auxiliary device for axial crushing energy absorption testing, comprising a support frame 1, a guide rail 2, a guide rail matching slider 3, a displacement sensor 4, a sample top plate 5, a sample bottom plate 6, a bottom fastening strip 7, and a bottom support block 8.

[0039] The support frame 1 and the bottom support block 8 form the frame mechanism of the device, which is fastened to the external ground or plane by anchor bolts.

[0040] There are four guide rails 2, each with a corresponding guide rail slider 3. The single-sided support frame 1 contains two guide rails 2, with a gap between them. The protruding rectangular blocks 9 on both sides of the sample top plate 5 are mounted on the guide rail sliders 3, allowing the sample top plate 5 to move up and down under the constraint of the gap, but without detaching from the frame mechanism composed of the support frame 1 and the bottom support block 8.

[0041] The displacement sensor 4 is located between the protruding rectangular blocks 9 on both sides of the sample top plate 5 and the bottom surface of the support frame 1, and is telescopic.

[0042] This device is matched with the double-cap-shaped beam structure specimen 10. The flange of the double-cap-shaped beam structure specimen 10 is connected by resistance welding, and the position of the weld point can be adjusted according to the test. The rectangular specimen base plate 6 is welded to the bottom of the double-cap-shaped beam structure specimen 10. The specimen top plate 5 is placed on top of the double-cap-shaped beam structure specimen 10, and the two are not connected by welding or gluing. The specimen top plate 5 can be replaced depending on the plate shape.

[0043] The bottom fastening strip 7 is used to fix the sample base plate 6, and it is fastened to the bolts on the bottom support block 8.

[0044] The guide rail is equipped with a slider 3, which has a spring clamp 12. The spring clamp 12 presses the protruding rectangular blocks 9 on both sides of the sample top plate 5 against the upper end of the guide rail equipped slider 3. The sample positioning pin 13 constrains the horizontal degrees of freedom of the protruding rectangular blocks 9 on both sides of the sample top plate 5. Its advantage is that the sample is only subjected to vertical pressure during the test, which is consistent with the frontal collision condition of a car. During the test, the sample top plate 5 presses the guide rail equipped slider 3 to move downward along the guide rail 2. The guide rail pulley 14 set on the guide rail equipped slider 3 will greatly reduce the friction, making the force value fed back by the hammer 15 more accurate.

[0045] The displacement sensor 4 is connected to the protruding rectangular blocks 9 on both sides of the sample top plate 5 through the sensor fixing mechanism 11. The universal joint below the sensor fixing mechanism 11 can ensure that the displacement sensor 4 moves vertically downward when the sample is twisted.

[0046] The steps for conducting a crushing energy absorption test using this device are as follows:

[0047] Step 1: According to relevant test standards or automotive part size requirements, fabricate double-hat-shaped beam structure specimen 10, and weld the specimen bottom (6) to the bottom of double-hat-shaped beam structure specimen 10, with the two centers aligned to form a crushable specimen with a bottom plate.

[0048] Step 2: Install the prepared crushing sample with the base plate onto the bottom support block 8 and fix it with bolts using the bottom fastening strip 7;

[0049] Step 3: Place the top plate 5 of the sample on the double-hat-shaped beam structure sample 10, centering them together;

[0050] Step 4: Use the sample positioning pin 13 on the guide rail matching slider 3 to position the protruding rectangular blocks 9 on both sides of the sample top plate 5, and then use the spring clip 12 to fix it.

[0051] Step 5: Fix the displacement sensor 4 to the protruding rectangular block 9 using the sensor fixing mechanism 11, with its lower part placed on the bottom surface of the support frame 1.

[0052] Step 6: Adjust the alignment of the sample top plate 5 and the drop hammer head 15, connect all sensor connection channels, check that everything is ready, turn on the drop hammer mechanism switch, and carry out the crushing energy absorption test.

[0053] Step 7: Collect data from the force sensor installed on the hammer head 15 and the displacement sensor 4 inside the support frame 1, and perform data analysis to obtain the crushing energy absorption characteristics of the material.

Claims

1. An auxiliary device for axial crushing energy absorption testing, characterized in that: Including frame mechanisms and displacement mechanisms, The frame structure includes a bottom support block (8) and support frames (1) vertically arranged on both sides of the bottom support block (8); The displacement mechanism includes two guide rails (2) spaced apart on each support frame (1), a guide rail matching slider (3) that slides between the two guide rails (2), a guide rail pulley (14) on the guide rail matching slider (3), a protruding rectangular block (9) mounted on the guide rail matching slider (3), a sample top plate (5) connected to the inside of the protruding rectangular block (9), a displacement sensor (4) between the protruding rectangular block (9) and the bottom surface of the support frame (1), a double-hat-shaped beam structure sample (10) placed at the bottom of the sample top plate (5), and a sample bottom plate (6) connected to the bottom of the double-hat-shaped beam structure sample (10). The sample bottom plate (6) is fixed on the support block (8). The displacement sensor (4) is a retractable displacement sensor. The protruding rectangular block (9) is located on both sides of the sample top plate (5).

2. The auxiliary device for axial crushing energy absorption testing according to claim 1, characterized in that: The guide rail matching slider (3) is also equipped with multiple spring clips (12), which press the protruding rectangular blocks (9) on both sides of the sample top plate (5) onto the upper end of the guide rail matching slider (3).

3. The auxiliary device for axial crushing energy absorption testing according to claim 2, characterized in that: The guide rail is equipped with a sample positioning pin (13) on the slider (3). The sample positioning pin (13) is located on the rear side of the spring plate (12) and / or the side of the protruding rectangular block (9).

4. The auxiliary device for axial crushing energy absorption testing according to claim 1, characterized in that: The displacement sensor (4) is connected to the protruding rectangular blocks (9) on both sides of the sample top plate (5) through the sensor fixing mechanism (11). A universal joint is also provided below the sensor fixing mechanism (11), and the other end of the universal joint is connected to the bottom surface of the support frame (1).

5. An auxiliary device for axial crushing energy absorption testing according to claim 1, characterized in that: The sample base plate (6) is fixed to the support block (8) by the bottom fastening strip (7).

6. The auxiliary device for axial crushing energy absorption testing according to claim 1, characterized in that: The sample top plate (5) and the protruding rectangular block (9) are integrally formed.

7. An auxiliary device for axial crushing energy absorption testing according to any one of claims 1-6, characterized in that: The frame structure is fastened to the external ground or plane using anchor bolts.

8. An auxiliary device for axial crushing energy absorption testing according to any one of claims 1-6, characterized in that: The rectangular specimen base plate (6) is welded to the bottom of the double-hat-shaped beam structure specimen (10).

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