A load plate for testing the shear force and friction force of helmets

Abstract

A carrier plate for testing the shear force and friction force of a helmet comprises a testing area of ​​at least 2 / 3 and a preparation area of ​​the remaining part, wherein a frosted plate and a cut block are arranged on the testing area, and the frosted plate and the cut block are installed by a mortise and tenon structure, which is more convenient to use, accelerates the testing progress and improves the working efficiency; a second mounting groove is arranged on a side surface of the carrier plate away from the preparation area, and the structure of the second mounting groove is the same as that of the mounting groove, and the cut block can be stored in the second mounting groove when performing a friction force test, thereby avoiding the risk of loss and allowing for quick replacement; the front side of the frosted plate is set as a rough surface, and the back side is set as a smooth plane, and mounting structures are arranged on both the front and back sides, and when performing a shear force test, it is only necessary to reverse the front and back sides of the frosted plate so that the smooth plane is placed on the top to connect with the top plane of the testing area, so that the test content can be changed more quickly, the operation is simpler, and the time for finding a plane plate can be saved, thereby accelerating the testing progress.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a loading plate used for testing the shear force and friction force of a helmet. Background Art

[0002] In recent years, electric bicycles have become an important means of transportation for the general public due to their economic convenience. As the number of users increases, traffic accidents caused by electric bicycles have also increased dramatically. The correct wearing of a helmet can greatly reduce the damage caused by traffic accidents. At the same time, the quality of the helmet is also one of the key factors in ensuring personal safety. However, the quality of helmets on the market varies. In order to fully adapt to the new industry application requirements of safety helmets and ensure the safety of motorcycle and electric vehicle riders, the new version of the GB811 standard in 2022 will add more testing requirements for the shear force and friction of helmets.

[0003] Therefore, a shear force and friction force testing device for a raised structure on a helmet surface has been disclosed in a Chinese patent application numbered CN202223107197.8, which specifically includes a frame, a support frame, a sliding frame, a rotating frame, a head mold and a loading frame 8; the support frame is a Z-shaped structure, and one end of the support frame is rotatably arranged on the frame; a telescopic cylinder for driving the support frame to flip is arranged on the frame, and the telescopic cylinder is rotatably connected to the frame; the sliding frame is slidably arranged on the support frame, and the sliding frame is clamped with the support frame; the rotating frame is rotatably arranged on the sliding frame, and the rotating frame is clamped with the sliding frame; The head mold is arranged on the rotating frame; the cargo rack 8 is slidably arranged on the frame; the cargo rack 8 is slidably connected to the head mold; a lifting assembly for driving the cargo rack to move is arranged on the frame; the device is mainly used to test the surface friction of the helmet and the shear force of the raised structure on the outer surface of the helmet, so as to prevent the helmet from being subjected to excessive resistance when rubbing against the ground in the event of an accident. The greater the friction, the greater the resistance, and the more serious the injury to the rider; and to prevent the rider from being subjected to secondary injury when the helmet with raised objects rubs against the ground during an accident, because the raised objects block the forward force of the wearer's head.

[0004] In the above structure, if Figure 4 As shown, a mounting frame 801 and a positioning plate 802 are provided on the carrier 8, and the mounting frame 801 is used for installing sandpaper and a cutter. It can be clearly seen from the attached figure that both the sandpaper and the cutter need to be fixed on the mounting frame 801 by fasteners. When a friction test is performed, the cutter needs to be removed and the sandpaper needs to be installed for testing, and when a shear force test is performed, the sandpaper needs to be removed and the cutter needs to be installed before the test is performed. This process is quite cumbersome and complicated, which delays the progress of the test, and the removed sandpaper or cutter requires additional storage space, otherwise it is easy to be damaged or lost, thereby affecting the test. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a loading plate for testing the shear force and friction force of a helmet.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A loading plate for testing the shear force and friction force of a helmet comprises a testing area of ​​at least 2 / 3 and a preparation area of ​​the remaining part, wherein the testing area is provided with a frosted plate for testing the friction force of the helmet surface and a cut block for testing the shear force of the raised part of the helmet surface in sequence, wherein the cut block is arranged at an edge away from the preparation area, and when the frosted plate and the cut block are installed, the upper surface of the frosted plate is flush with the upper surface of the testing area, while the cut block protrudes from the upper surface of the frosted plate, and the frosted plate and the cut block are both detachably installed on the testing area through a mortise and tenon structure, and the mortise and tenon structure comprises at least two groups of mounting grooves arranged on the testing area for mounting the frosted plate and the cut block, and the frosted plate and the cut block are both provided with mounting structures with cross sections adapted to the mounting grooves, and the frosted plate and the cut block are slidably fitted in the mounting grooves through the mounting structures.

[0008] In the present invention, the mounting groove may be a dovetail groove or a T-shaped groove, and the mounting groove extends to both sides of the object carrier plate to the end surface.

[0009] In the utility model, the cut block is a long strip structure, and the length direction is perpendicular to the moving direction of the carrier plate.

[0010] In the utility model, a second mounting groove for storing cut pieces is provided on a side surface of the loading plate away from the preparation area, and the structure of the second mounting groove is the same as that of the mounting groove.

[0011] In the utility model, the front side of the frosted plate is a rough surface, the back side of the frosted plate is a smooth plane, and both the front side and the back side of the frosted plate are provided with mounting structures for matching the mounting grooves.

[0012] Furthermore, the mounting structure is arranged at the edge of the frosted plate, and there is enough space in the middle of the front and back sides of the frosted plate for testing.

[0013] The utility model has the following advantages and beneficial effects:

[0014] A preparation area and a test area are provided on the carrier plate, and a frosted plate and a cut block are provided on the test area. The frosted plate and the cut block can be quickly installed through a mortise and tenon structure, which is not only more convenient to use, but also can speed up the test progress and improve work efficiency. A second mounting groove for storing the cut block is provided on a side surface of the carrier plate away from the preparation area. The structure of the second mounting groove is the same as that of the mounting groove. When conducting a friction force test, the removed cut block can be stored through the second mounting groove, which will not interfere with the test, and there is no need to find another way to save it, thus avoiding the risk of loss, and the position of the cut block can be quickly replaced. The front side of the frosted plate is set as a rough surface, and the back side is set as a smooth plane, and mounting structures are provided on both the front and back sides. When conducting a shear force test, it is only necessary to reverse the front and back sides of the frosted plate so that the smooth plane is placed on top and connected with the top plane of the test area. This can change the test content more quickly, the operation is simpler, and the time of finding a flat plate can be saved, thus speeding up the test progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 Schematic diagram of the installation of the carrier plate in this embodiment;

[0017] Figure 2 is a top view of the carrier plate in this embodiment;

[0018] Figure 3 This is a schematic diagram of the installation of the grinding plate and the cut block on the object carrier plate in this embodiment;

[0019] Figure 4 It is a structural schematic diagram of a carrier in the background technology. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, but the utility model is not limited to the following embodiments.

[0021] like Figures 1 to 3As shown, this embodiment discloses a carrier plate for testing the shear force and friction force of a helmet. The carrier plate 2 is movably mounted on a horizontal support beam in a helmet shear force and friction force testing device. At least 2 / 3 of the carrier plate 2 is set as a test area 20, and the rest is set as a preparation area 21. Before preparing for the test, the carrier plate 2 is moved to a side close to a helmet mounting mechanism 3, and the angle and position of the helmet are adjusted so that the test point on the helmet is vertically against the center of the preparation area 21. A frosted plate 22 for testing the friction force of the helmet surface and a cut-off block 23 for testing the shear force of the raised portion of the helmet surface are sequentially arranged on the test area 20. The cut-off block 23 is arranged at an edge away from the preparation area 21. At the same time, the cut-off block 23 is a long strip structure, and the length direction is perpendicular to the moving direction of the carrier plate 2. When the frosted plate 22 and the cut-off block 23 are installed, the upper surface of the frosted plate 22 is flush with the upper surface of the test area 20, and the cut-off block 23 is disposed at a position close to the test area 20. 23 protrudes from the upper surface of the frosting plate 22. Specifically, the frosting plate 22 and the cut block 23 are both detachably mounted on the test area 20 through a mortise and tenon structure. Specifically, at least two groups of mounting grooves 200 for mounting the frosting plate 22 and the cut block 23 are provided on the test area 20. The mounting grooves 200 can be dovetail grooves or T-shaped grooves, and the mounting grooves 200 extend to the end surfaces of both sides of the carrier plate 2. The frosting plate 22 and the cut block 23 are both provided with mounting structures 201 whose cross-sections are adapted to the mounting grooves 200. The frosting plate 22 and the cut block 23 are slidably fitted in the mounting grooves 200 through the mounting structures 201. It can be determined that the extension direction of the mounting grooves 200 is perpendicular to the moving direction of the carrier plate 2, so that the frosting plate 22 and the cut block 23 can be prevented from easily detaching from the carrier plate 2. The frosting plate 22 and the cut block 23 can be quickly installed through the mortise and tenon structure, which is not only convenient and fast, but also can speed up the test progress and improve work efficiency.

[0022] In this embodiment, when conducting a friction test, since the cut block 23 is not needed, the cut block 23 needs to be removed and stored separately. In order to facilitate storage, a second mounting groove 202 for storing the cut block 23 is provided on the side surface of the carrier plate 2 away from the preparation area. It can be determined that the structure of the second mounting groove 202 is the same as the structure of the above-mentioned mounting groove 200, and only the position is changed. Therefore, when conducting a friction test, the removed cut block 23 can be stored through the second mounting groove 202, which will not interfere with the test, and there is no need to find another location for storage, thereby avoiding the risk of loss, and the position of the cut block 23 can be quickly changed.

[0023] When conducting a shear force test, the cut block 23 is installed in the mounting groove 200 of the test area 20. In order to prevent the rough surface on the frosted plate 22 from affecting the shear force test, the frosted plate 22 needs to be removed and replaced with a flat plate with a smooth surface so as to keep the height of the test area 20 consistent with the height of the preparation area 21. In this way, an additional flat plate needs to be prepared to replace the frosted plate 22, which not only causes material waste but also increases the difficulty of preservation. Therefore, the front side of the frosted plate 22 is set as a rough surface, and the back side of the frosted plate 22 is set as a smooth plane, and mounting structures 201 for cooperating in the mounting groove 200 on the test area 20 are provided on the front and back sides. When preparing for the test, it is only necessary to reverse the front and back sides of the frosted plate 22 so that the smooth plane is placed on the top and connected with the top plane of the test area 20. This can change the test content more quickly, the operation is simpler, and the time of finding a flat plate can be saved, thereby speeding up the test progress.

[0024] Furthermore, in order to prevent the mounting structures 201 on the front and back sides of the carrier plate 2 from affecting the test, the mounting structures 201 are arranged at the edge of the frosted plate 22 so that there is enough space in the middle of the front and back sides of the frosted plate 22 for testing.

[0025] The above contents described in this specification are merely examples of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the contents of the present invention specification or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A loading plate for testing the shear force and friction force of a helmet, characterized in that: The invention comprises a test area (20) of at least 2 / 3 and a preparation area (21) of the remaining part, wherein the test area (20) is provided with a grinding plate (22) for testing the friction force of the helmet surface and a cut-out block (23) for testing the shear force of the protrusion on the helmet surface in sequence, wherein the cut-out block (23) is arranged at an edge away from the preparation area (21), and when the grinding plate (22) and the cut-out block (23) are installed, the upper surface of the grinding plate (22) is flush with the upper surface of the test area (20), and the cut-out block (23) protrudes from the grinding plate (22). The frosted plate (22) and the cut block (23) are both detachably mounted on the test area (20) via a mortise and tenon structure, the mortise and tenon structure comprising at least two groups of mounting grooves (200) arranged on the test area (20) for mounting the frosted plate (22) and the cut block (23), the frosted plate (22) and the cut block (23) are both provided with mounting structures (201) having cross-sections matching the mounting grooves (200), and the frosted plate (22) and the cut block (23) are slidably fitted in the mounting grooves (200) via the mounting structures (201).

2. A carrier plate for testing the shear force and friction force of a helmet according to claim 1, characterized in that: The mounting groove (200) may be a dovetail groove or a T-shaped groove, and the mounting groove (200) extends to both sides of the object carrier plate (2) to the end surface.

3. A carrier plate for testing the shear force and friction force of a helmet according to claim 1, characterized in that: The cut block (23) is a long strip structure, and the length direction is perpendicular to the moving direction of the carrier plate (2).

4. A carrier plate for testing the shear force and friction force of a helmet according to claim 1, characterized in that: A second mounting groove (202) for storing the cut pieces (23) is provided on a side surface of the object carrier (2) away from the preparation area, and the structure of the second mounting groove (202) is the same as that of the mounting groove (200).

5. A carrier plate for testing the shear force and friction force of a helmet according to claim 1, characterized in that: The front side of the frosted plate (22) is a rough surface, and the back side of the frosted plate (22) is a smooth plane. Both the front side and the back side of the frosted plate (22) are provided with mounting structures (201) for matching the mounting grooves (200).

6. A carrier plate for testing the shear force and friction force of a helmet according to claim 5, characterized in that: The mounting structure (201) is arranged at the edge of the frosting plate (22), and there is sufficient space in the middle of the front and back surfaces of the frosting plate (22) for testing.

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