A crash test apparatus for automotive polycarbonate sheets

Abstract

This invention relates to the field of impact testing technology, specifically to an impact testing device for automotive polycarbonate sheets. It includes a testing device body, a clamping assembly, and an adaptor. When the test sheet is relatively large, the adaptor can be compressed to increase the distance between the test sheet and the ball-dropping mechanism; when the test sheet is small, it can be closer to the ball-dropping mechanism. In this invention, when the ball impacts the surface of a large sheet, the buffering effect of the adaptor on the large sheet is smaller. However, during the testing of a small sheet, the pressure on the adaptor is smaller, and the rebound force is larger. When the ball impacts the surface of a small sheet, the buffering effect of the adaptor on the small sheet is greater than that on a large sheet. This results in the large sheet experiencing a greater overall impact force than the small sheet, thus effectively reducing the over-testing of different sheet materials.

Description

Technical Field

[0001] This invention relates to the field of impact testing technology, and more specifically, to an impact testing device for automotive polycarbonate sheets. Background Technology

[0002] Polycarbonate sheet strength testing is a process of evaluating the various strength properties of polycarbonate sheets through a series of professional equipment and methods. It typically involves using devices such as universal testing machines and impact testing machines to perform tensile, compression, bending, and impact tests on the sheets.

[0003] To simulate the impact situations that the boards may encounter during use, impact testing before leaving the factory has become a necessary quality control measure. At present, most manufacturers focus on qualitative judgment of the impact resistance of the boards in this stage. That is, when conducting impact testing, detailed data recording is usually not required. Instead, the quality is initially assessed by directly observing whether the polycarbonate boards can withstand specific impacts.

[0004] To compensate for the shortcomings of single fixed-force impact tests and improve the quality and comprehensiveness of the tests, multiple impact tests with different forces are usually used. The most common way to adjust the impact force is to change the falling height of the impact ball or change the mass of the ball. At present, electromagnetic adsorption is often used to control the impact ball. The electromagnetic adsorption device is fixedly installed at a specific height. Once it is necessary to adjust the falling height of the ball to change the impact force, the entire adsorption device must be disassembled and reinstalled in a complicated manner because the position of the electromagnetic adsorption device is fixed. This process not only reduces production efficiency, but frequent operation can also lead to adverse consequences such as reduced accuracy of the electromagnetic adsorption device and loosening of the connection parts.

[0005] Considering that polycarbonate sheets of different sizes can withstand different impact forces, in order to prevent over-testing, theoretically, spheres of different masses should be selected according to the size of the sheet. However, the specifications of sheets from the same batch are not the same due to different subsequent application scenarios. If the mass of the sphere is changed one by one according to the specific size of the sheet, the entire sphere device needs to be replaced or additional counterweights need to be added, which is extremely inconvenient and lacks flexibility.

[0006] Therefore, there is an urgent need for an impact testing device for automotive polycarbonate sheets to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide an impact testing device for automotive polycarbonate sheets, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides an impact resistance testing device for automotive polycarbonate sheets, comprising a testing device body, the testing device body including a base, a support mechanism for horizontally placing the test sheet on the top of the base, a vertical rod fixedly installed on the top of the other side of the base, a ball-dropping mechanism installed at the upper end of the vertical rod, the ball-dropping mechanism being located directly above the support mechanism, a bottom groove being formed in the middle of the base, the support mechanism including a clamping assembly and an adaptor, the adaptor being located below the clamping assembly, when the test sheet is relatively large, the adaptor can be compressed, causing the clamping assembly to slide down, thereby increasing the distance between the test sheet and the ball-dropping mechanism, when the test sheet is small, the test sheet is placed on the surface of the clamping assembly, allowing it to be closer to the ball-dropping mechanism.

[0009] As a further improvement to this technical solution, the ball-dropping mechanism includes a support platform that is snapped and fixed to the upper surface of the upright. An electromagnetic adsorption component is fixedly installed on the top of the support platform. The other end of the electromagnetic adsorption component passes through the support platform and is located at the bottom of the support platform. The ball-dropping body is adsorbed and connected inside the bottom end of the electromagnetic adsorption component. A control box is fixedly installed on the side end of the support platform.

[0010] As a further improvement to this technical solution, the clamping assembly includes a support platform, which is fixedly installed on the top of the base. A protective cavity is formed inside the support platform, and an inner platform is slidably provided inside the protective cavity. The test plate is placed on the surface of the inner platform, and a ball drop hole is opened in the middle of the inner platform. A clamping cover for clamping the test plate is installed on the top surface of the inner platform.

[0011] As a further improvement to this technical solution, the clamping cover includes four corner rods fixedly installed at the top of the four corners of the inner platform. The surfaces of the four corner rods are all threaded. A hollow pressure plate is provided on the surface of the inner platform. The four ends of the hollow pressure plate are sleeved on the surfaces of the four corner rods. The hollow pressure plate and the four corner rods are fixed together by multiple fixing rings threaded together.

[0012] As a further improvement to this technical solution, the adaptor includes two pads, which are symmetrically fixedly installed inside the cavity. Two fixing rods are fixedly installed on the surface of each of the two pads. All four fixing rods are hollow structures, and movable rods are movably installed inside each of the four fixing rods. The side of each of the four movable rods away from the pads is fixedly installed at the bottom of the inner platform. Four elastic elements are fixedly installed between the inner platform and the two pads, and the four elastic elements are respectively sleeved on the surface of the four movable rods.

[0013] As a further improvement to this technical solution, an extension ring is fixedly installed inside the ball drop hole of the inner platform. The top of the extension ring is flush with the upper surface of the inner platform, and the bottom of the extension ring extends out of the lower surface of the inner platform.

[0014] As a further improvement to this technical solution, two side grooves are opened on both sides of the inner wall of the protective cavity, and an extension plate is slidably provided inside each of the four side grooves. Two side clamping plates are respectively clamped and installed at both ends of the inner platform, and the four side clamping plates are respectively fixedly connected to the ends of the four extension plates away from the side grooves.

[0015] As a further improvement to this technical solution, a gasket is laid on one end of the hollow pressure plate near the inner platform, and the gasket is made of a soft material.

[0016] As a further improvement to this technical solution, an indicator is provided in the center of the surface of the inner platform, which is used to indicate the placement position of the board.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] In this impact testing device for automotive polycarbonate sheets, a suitable hollow pressure plate is selected to clamp the sheet according to the size of the sheet to be tested. During the pressing process, the adaptor will compress accordingly based on the mass of the sheet. When testing large sheets, the compression of the adaptor can cause the inner platform to slide downward, thereby increasing the distance between the sheet to be tested and the falling ball, thus achieving the purpose of increasing the impact force. When testing small sheets, since the weight of the small sheet is lower than that of the large sheet, the downward range of the inner platform will be smaller. Therefore, compared with the large sheet, the distance between the small sheet and the falling ball is closer, and the impact force is relatively reduced.

[0019] Meanwhile, the adaptor is adjustable. When the plate is pressed down on top of the adaptor, the adaptor still retains a certain degree of elasticity. When testing large plates, the adaptor bears greater pressure and its rebound force is relatively smaller. Therefore, when the ball impacts the surface of a large plate, the buffering range of the adaptor on the large plate is also smaller. However, during testing small plates, the adaptor bears less pressure and has a larger rebound force. Through rebound, the ball can fall on the surface of the test plate multiple times, allowing for multiple tests. When the ball impacts the surface of a small plate, the buffering range of the adaptor on the small plate is greater than that on a large plate. This results in the large plate bearing a greater overall impact force than the small plate. In this way, the over-testing of different plates is effectively reduced when the ball's position and mass remain unchanged. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a side view of the overall structure of the present invention;

[0022] Figure 3 This is an exploded structural diagram of the clamping cover of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the protective cavity of the present invention;

[0024] Figure 5 This is a schematic diagram of the large-size test plate placement structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the small-sized test plate placement structure of the present invention;

[0026] Figure 7 For the present invention Figure 5 A schematic diagram of the structure at point A;

[0027] Figure 8 This is a schematic diagram of the internal structure of the support platform of the present invention;

[0028] Figure 9 This is a schematic diagram of the adaptor structure of the present invention.

[0029] The meanings of the labels in the diagram are as follows:

[0030] 1. Test apparatus body; 11. Ball dropping mechanism; 12. Support mechanism; 13. Base; 14. Vertical pole; 131. Bottom groove;

[0031] 21. Electromagnetic adsorption component; 22. Support platform; 23. Control box; 24. Ball dropping body;

[0032] 31. Fixture assembly; 32. Clamping cover; 33. Adaptor;

[0033] 311. Support platform; 312. Cavity protection; 313. Inner platform; 314. Extension ring;

[0034] 321. Angle rod; 322. Fixing ring; 323. Hollow pressure plate;

[0035] 331. Pad; 332. Fixed rod; 333. Movable rod; 334. Elastic element;

[0036] 4. Side clamping plate; 41. Side groove; 42. Extension plate;

[0037] 5. Gaskets;

[0038] 6. Indicator signs. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] For examples, please refer to Figures 1-4 As shown, the purpose of this embodiment is to provide an impact resistance testing device for automotive polycarbonate sheets, including a testing device body 1. The testing device body 1 includes a base 13. A support mechanism 12 for horizontally placing the test sheet is installed on the top of the base 13. A vertical rod 14 is fixedly installed on the top of the other side of the base 13. A ball dropping mechanism 11 is installed at the upper end of the vertical rod 14. The ball dropping mechanism 11 is located directly above the support mechanism 12. A bottom groove 131 is opened in the middle of the base 13.

[0041] The support mechanism 12 includes a clamp assembly 31 and an adapter 33. The adapter 33 is located below the clamp assembly 31. When the test plate size is relatively large, the adapter 33 can be compressed, causing the clamp assembly 31 to slide down, thereby increasing the distance between the test plate and the ball dropping mechanism 11. When the test plate size is small, the test plate is placed on the surface of the clamp assembly 31, which can be closer to the ball dropping mechanism 11.

[0042] First, the specific structure of the ball-dropping mechanism 11 is disclosed. The ball-dropping mechanism 11 includes a support platform 22 that is snapped and fixed to the upper surface of the upright 14. An electromagnetic adsorption component 21 is fixedly installed on the top of the support platform 22. The other end of the electromagnetic adsorption component 21 passes through the support platform 22 and is located at the bottom of the support platform 22. The ball-dropping body 24 is adsorbed and connected inside the bottom end of the electromagnetic adsorption component 21. A control box 23 is fixedly installed on the side end of the support platform 22.

[0043] See Figure 2 As shown, one end of the electromagnetic adsorption component 21 fixed at the top of the support platform 22 extends through the support platform 22 to the bottom. The ball body 24 is connected to the bottom of the electromagnetic adsorption component 21 through electromagnetic adsorption. When the control box 23 located on the side of the support platform 22 issues a command to control the electromagnetic adsorption component 21 to change its electromagnetic state, the ball body 24 will fall due to loss of adsorption force, thus realizing the ball dropping operation.

[0044] The control principle of the control box 23 for the electromagnetic adsorption component 21 is mainly based on the principle of electromagnetism. The control box 23 contains a circuit system and a control unit. When the signal that triggers the ball drop operation is input into the control box 23, the internal control unit will operate the circuit system according to the preset program and parameters. Under the action of the circuit system, the current or voltage of the electromagnetic adsorption component 21 will be changed. The electromagnetic force of the electromagnetic adsorption component 21 is achieved by the magnetic field generated by the current to adsorb the ball body 24. Once the electrical parameters change, the internal magnetic field will change. When the magnetic field strength decreases to a certain level and can no longer provide sufficient adsorption force, the ball body 24 will fall due to gravity. This control method can accurately control the timing of the ball drop by precisely adjusting the electrical parameters, thereby meeting the requirements of the impact test experiment for the accuracy of the ball drop action triggering and the consistency of execution.

[0045] When conducting an impact resistance test on the plate, the plate needs to be placed first using the clamp assembly 31. The specific structure of the clamp assembly 31 is disclosed below. The clamp assembly 31 includes a support platform 311, which is fixedly installed on the top of the base 13. A protective cavity 312 is formed inside the support platform 311. An inner platform 313 is slidably provided inside the protective cavity 312. The test plate is placed on the surface of the inner platform 313. A ball drop hole is opened in the middle of the inner platform 313. A clamping cover 32 for clamping the test plate is installed on the top surface of the inner platform 313.

[0046] Then, the specific structure of the clamping cover 32 is disclosed. The clamping cover 32 includes four corner rods 321 fixedly installed at the top of the four corners of the inner platform 313. The surfaces of the four corner rods 321 are threaded. The surface of the inner platform 313 is provided with a hollow pressure plate 323. The four ends of the hollow pressure plate 323 are sleeved on the surfaces of the four corner rods 321. The hollow pressure plate 323 and the four corner rods 321 are threadedly fixed by multiple fixing rings 322.

[0047] Combination Figure 3 and Figure 5 As can be seen, when placing the board, the board to be tested is placed stably on the surface of the inner platform 313. Then, a suitable hollow pressure plate 323 is selected according to the size of the board to be tested (the inner diameter of the hollow pressure plate 323 needs to be smaller than the size of the board to be tested). After the hollow pressure plate 323 is placed in place, it is fixed with the fixing ring 322 to ensure that the board to be tested can be stably clamped between the inner platform 313 and the hollow pressure plate 323.

[0048] Among them, the hollow pressure plate 323 is suitable to be made of a lightweight material with high hardness (such as engineering plastics). In this way, even if different hollow pressure plates 323 are replaced due to different plate sizes, it will not have a significant impact on the subsequent testing process and results, thus ensuring the stability and accuracy of the entire testing process.

[0049] Finally, the specific structure of the adaptor 33 is disclosed. The adaptor 33 includes two pads 331, which are symmetrically fixed inside the cavity 312. Two fixing rods 332 are fixedly installed on the surface of each of the two pads 331. All four fixing rods 332 are hollow structures. Movable rods 333 are movably installed inside each of the four fixing rods 332. The side of each of the four movable rods 333 away from the pads 331 is fixedly installed at the bottom of the inner platform 313. Four elastic elements 334 are fixedly installed between the inner platform 313 and the two pads 331. The four elastic elements 334 are respectively sleeved on the surface of the four movable rods 333.

[0050] See Figure 4 and combined Figure 9 As shown, a pad 331 is installed at the bottom of the inner cavity of the protective cavity 312. A fixed rod 332, a movable rod 333, and an elastic element 334 are connected between the pad 331 and the inner platform 313. When the plate is placed on the surface of the inner platform 313, the elastic element 334 will compress adaptively according to the condition of the plate, while the movable rod 333 will slide into the fixed rod 332 under the action of the inner platform 313; see reference. Figure 5 and combined Figure 6 As shown, when testing large boards, due to their greater weight, the inner platform 313 slides down significantly after being pressed onto its surface. Since the inner platform 313 slides down while the position of the falling ball 24 remains fixed, the distance between the large board and the falling ball 24 is greater during the large board test, thus increasing the impact force of the falling ball on the large board. On the other hand, small boards are relatively lighter, and the inner platform 313 slides down less after placement. The distance between the small board and the falling ball 24 is closer than that of the large board, so the impact force of the falling ball on the small board is relatively reduced. This allows for different impact force testing effects based on the size of the board.

[0051] During plate testing, larger plates, due to their greater mass, exert stronger compression on the elastic element 334 when placed on the inner platform 313. When the falling ball 24 impacts the surface of the larger plate, the elastic element 334, already significantly compressed, provides relatively less cushioning, allowing the falling ball 24 to exert a greater impact force on the larger plate. Smaller plates, being lighter, exert less compression on the elastic element 334. When the falling ball 24 impacts the surface of the smaller plate, the elastic element 334 has more remaining cushioning space, resulting in a more significant cushioning effect and a relatively smaller impact force. In this way, by utilizing the different degrees of compression of the elastic element 334 by plate size, the impact force of the same falling ball 24 on plates of different sizes is adjusted, ensuring that larger plates receive a greater impact force and smaller plates receive a smaller impact force. This effectively avoids over-testing of different plates due to fixed falling ball conditions, making the test results more consistent with actual needs and more targeted.

[0052] Whether it is a large or small board, when placed on the surface of the inner platform 313, it will exert a downward pressure on the inner platform 313 due to its own weight. In this way, the board can be tested within the space defined by the protective cavity 312. This design effectively limits the range of the falling ball. After multiple bounce tests, the possibility of the ball falling outside the support platform 311 due to accident can also be reduced, thereby significantly improving the safety of the entire testing process.

[0053] in, Figure 5 straight arrows and Figure 6 The dotted arrows in the diagram represent the springback of the adaptor 33 when the large and small plates are placed on the surface of the inner platform 313, respectively. Figure 5 The shorter straight arrow in the image indicates a smaller rebound amplitude. Figure 6 The longer dashed arrow in the middle indicates a relatively large rebound amplitude.

[0054] Since the plate may fail the test and break due to the impact of the falling ball during the ball drop test, an extension ring 314 is fixedly installed in the ball drop hole of the inner platform 313. The top of the extension ring 314 is flush with the upper surface of the inner platform 313, and the bottom of the extension ring 314 extends out of the lower surface of the inner platform 313.

[0055] The improvement lies in: according to Figure 5 It can be seen that the top of the extension ring 314 is flush with the upper surface of the inner platform 313, and its bottom extends out of the lower surface of the inner platform 313. If the plate fails the test and is damaged, the ball body 24 or plate debris will fall from the middle of the inner platform 313. The extension ring 314 can change its falling trajectory, effectively reducing the situation where the ball or plate debris falls directly onto the pad 5, and ensuring that the adapting part 33 can operate normally.

[0056] Since the inner platform 313 needs to slide vertically and stably and accurately during the experiment to ensure the stability of the plate placement and the test results are not disturbed, two side grooves 41 are opened on both sides of the inner wall of the protective cavity 312. An extension plate 42 is slidably installed inside each of the four side grooves 41. Two side clamping plates 4 are clamped and installed at both ends of the inner platform 313, and the four side clamping plates 4 are fixedly connected to the ends of the four extension plates 42 away from the side grooves 41.

[0057] The improvements are: See Figure 5 and combined Figure 7 As shown, the cooperation between the side groove 41 and the extension plate 42 can guide and limit the sliding direction of the inner platform 313, effectively constraining the inner platform 313 to slide only in the vertical direction, thereby ensuring that the accuracy and reliability of the experiment will not be affected by the instability or displacement of the inner platform 313 when placing the plate and conducting plate testing.

[0058] Since the hollow pressure plate 323 and the inner platform 313 clamp the board when testing the board, and the hollow pressure plate 323 itself is relatively hard, direct contact with the board can easily damage the surface of the board. Therefore, a pad 5 is laid on the end of the hollow pressure plate 323 near the inner platform 313. The pad 5 is made of soft material.

[0059] The improvement is that a soft material pad 5 is laid at one end of the hollow pressure plate 323 near the inner platform 313. The pad 5 can be made of rubber or silicone, which has good flexibility and elasticity, protecting the surface of the plate from additional damage, thereby ensuring that the test is carried out smoothly and reliable results are obtained.

[0060] In order to ensure the accuracy of the test results, the board needs to be placed in the center of the inner platform 313 during the board test, so that the test area of ​​the board can be located at the lower end of the ball body 24. Therefore, an indicator 6 is provided in the middle of the surface of the inner platform 313. The indicator 6 is used to indicate the placement position of the board.

[0061] The improvements are: See Figure 8 As shown, the inner platform 313 has an indicator 6 on its surface. Its purpose is to provide operators with an intuitive and clear reference, helping them to quickly and accurately position the board to the ideal center position, thereby effectively reducing test errors caused by inaccurate placement and ensuring that the test results have higher reliability and validity.

[0062] In summary, the working principle of this scheme is as follows: First, the material to be tested is placed stably on the surface of the inner platform 313. Then, a suitable hollow pressure plate 323 is selected according to the size of the material to be tested. After the hollow pressure plate 323 is placed in place, it is fixed by the fixing ring 322 to ensure that the material to be tested can be stably clamped between the inner platform 313 and the hollow pressure plate 323. When the material is placed on the surface of the inner platform 313, the elastic element 334 will compress adaptively according to the material condition, and at the same time, the movable rod 333 will slide into the fixed rod 332 under the action of the inner platform 313. When testing large boards, their greater weight causes the inner platform 313 to slide down significantly after being pressed onto its surface. Since the inner platform 313 slides down while the position of the falling ball 24 remains fixed, the distance between the large board and the falling ball 24 is greater during the large board test, thus increasing the impact force of the falling ball on the large board. On the other hand, small boards are relatively lighter, and the inner platform 313 slides down less after being placed on it. The distance between the small board and the falling ball 24 is closer than that of the large board, so the impact force of the falling ball on the small board is relatively reduced. This allows for different impact force testing effects based on the size of the board.

[0063] Meanwhile, due to its greater mass, the larger board exerts stronger compression on the elastic element 334 when placed on the inner platform 313. When the ball body 24 impacts the surface of the larger board, the elastic element 334, already significantly compressed, provides relatively less cushioning, allowing the ball body 24 to exert a greater impact force on the larger board. Conversely, the smaller board, being lighter, exerts less compression on the elastic element 334. When the ball body 24 impacts the surface of the smaller board, the elastic element 334 has more remaining cushioning space, resulting in a more significant cushioning effect and a relatively smaller impact force. In this way, by utilizing the different degrees of compression of the elastic element 334 by the board size, the impact force of the same ball body 24 on boards of different sizes is adjusted, ensuring that the larger board receives a greater impact force and the smaller board receives a smaller impact force. This effectively avoids over-testing of different boards due to fixed ball drop conditions. Furthermore, regardless of whether it is a large or small board, the elastic element 334 allows the ball to bounce multiple times with varying amplitudes after falling, achieving the effect of multiple tests on the board.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A test apparatus for impact resistance of automotive polycarbonate sheets, comprising a test apparatus body (1), characterized in that: The test device body (1) includes a base (13), a support mechanism (12) for horizontally placing the test plate is installed on the top of the base (13), a vertical rod (14) is fixedly installed on the top of the other side of the base (13), a ball dropping mechanism (11) is installed at the upper end of the vertical rod (14), the ball dropping mechanism (11) is located directly above the support mechanism (12), and a bottom groove (131) is opened in the middle of the base (13). The support mechanism (12) includes a placement component (31) and an adapter (33). The adapter (33) is located below the placement component (31). When the test plate size is relatively large, the adapter (33) can be compressed, causing the placement component (31) to slide down, thereby increasing the distance between the test plate and the ball dropping mechanism (11). When the test plate size is small, the test plate is placed on the surface of the placement component (31), which can be closer to the ball dropping mechanism (11). The placement component (31) includes a support platform (311), which is fixedly installed on the top of the base (13). A protective cavity (312) is formed inside the support platform (311). An inner platform (313) is slidably provided inside the protective cavity (312). The test plate is placed on the surface of the inner platform (313). A ball drop hole is opened in the middle of the inner platform (313). A clamping cover (32) for clamping the test plate is installed on the top surface of the inner platform (313). The adaptor (33) includes two pads (331), which are symmetrically fixed inside the cavity (312). Two fixing rods (332) are fixedly installed on the surface of each of the two pads (331). All four fixing rods (332) are hollow structures. Movable rods (333) are movably installed inside each of the four fixing rods (332). The side of each of the four movable rods (333) away from the pads (331) is fixedly installed at the bottom of the inner platform (313). Four elastic elements (334) are fixedly installed between the inner platform (313) and the two pads (331). The four elastic elements (334) are respectively sleeved on the surface of the four movable rods (333).

2. The impact resistance testing device for automotive polycarbonate sheets according to claim 1, characterized in that: The ball-dropping mechanism (11) includes a support platform (22) that is snapped and fixed to the upper surface of the upright (14). An electromagnetic adsorption component (21) is fixedly installed on the top of the support platform (22). The other end of the electromagnetic adsorption component (21) passes through the support platform (22) and is located at the bottom of the support platform (22). The ball-dropping body (24) is adsorbed and connected inside the bottom end of the electromagnetic adsorption component (21). A control box (23) is fixedly installed on the side end of the support platform (22).

3. The impact resistance testing device for automotive polycarbonate sheets according to claim 1, characterized in that: The clamping cover (32) includes four corner rods (321) fixedly installed at the top of the four corners of the inner platform (313). The surfaces of the four corner rods (321) are threaded. The surface of the inner platform (313) is provided with a hollow pressure plate (323). The four ends of the hollow pressure plate (323) are sleeved on the surfaces of the four corner rods (321). The hollow pressure plate (323) and the four corner rods (321) are threadedly fixed by multiple fixing rings (322).

4. The impact testing device for automotive polycarbonate sheets according to claim 1, characterized in that: An extension ring (314) is fixedly installed in the ball drop hole of the inner platform (313). The top of the extension ring (314) is flush with the upper surface of the inner platform (313), and the bottom of the extension ring (314) extends out of the lower surface of the inner platform (313).

5. The impact resistance testing device for automotive polycarbonate sheets according to claim 1, characterized in that: Two side grooves (41) are opened on both sides of the inner wall of the protective cavity (312). An extension plate (42) is slidably provided inside the four side grooves (41). Two side clamps (4) are clamped and installed at both ends of the inner platform (313). The four side clamps (4) are fixedly connected to the ends of the four extension plates (42) away from the side grooves (41).

6. The impact resistance testing device for automotive polycarbonate sheets according to claim 3, characterized in that: The hollow pressure plate (323) has a pad (5) laid on one end near the inner platform (313), and the pad (5) is made of soft material.

7. The impact resistance testing device for automotive polycarbonate sheets according to claim 1, characterized in that: An indicator (6) is provided in the center of the surface of the inner platform (313), and the indicator (6) is used to indicate the placement position of the board.

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