Damping particle recovery coefficient testing device

Abstract

The utility model discloses a damping particle recovery coefficient testing device. The testing device comprises a support, a damping particle putting assembly, a detection unit and a control unit. The damping particle putting assembly is arranged on the bracket, and the damping particle putting assembly is provided with a putting opening through which to-be-tested damping particles pass and freely fall; the support is provided with a rebounding acting face, and the rebounding acting face is located below the throwing opening. The detection unit is arranged on the bracket below the throwing opening and is used for detecting the moment when the damping particles to be detected collide with the rebound acting surface; and the control unit is used for obtaining a damping particle recovery coefficient according to the moment when the freely falling damping particles collide with the rebound acting surface. By applying the scheme, the test process can be effectively simplified and the test cost can be saved on the basis of effectively improving the test precision.

Description

Technical Field

[0001] The utility model relates to the technical field of material testing, in particular to a damping particle restitution coefficient testing device. Background Art

[0002] The coefficient of restitution of damped particles is a physical quantity that characterizes the energy dissipation effect caused by the relative motion of damped particles during a collision. The square root of the ratio of the height of the damped particle's rebound to the height of its free fall is the coefficient of restitution. Accurately obtaining the coefficient of restitution of damped particles is an important indicator in studying the dynamic behavior of damped particles.

[0003] In view of this, it is urgent to optimize the test scheme for the restitution coefficient of damping particles to meet the needs of different application scenarios. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a damping particle restitution coefficient testing device, which can effectively simplify the testing process and save testing costs on the basis of effectively improving the testing accuracy.

[0005] The utility model provides a damping particle restitution coefficient testing device, comprising a bracket, a damping particle delivery component, a detection unit and a control unit; the damping particle delivery component is arranged on the bracket, and the damping particle delivery component has a delivery port for the damping particles to be tested to pass through and fall freely; the bracket has a rebound action surface, and the rebound action surface is located below the delivery port; the detection unit is arranged on the bracket below the delivery port, and is used to detect the moment when the damping particles to be tested collide with the rebound action surface; the control unit is used to obtain the damping particle restitution coefficient according to the moment when the freely falling damping particles collide with the rebound action surface.

[0006] Optionally, the detection unit is a vibration acceleration sensor, and the control unit is used to obtain the damping particle restitution coefficient based on a first moment when the freely falling damping particle collides with the rebound surface for the first time, and a second moment when the damping particle collides with the rebound surface for the second time.

[0007] Optionally, the delivery port is located 0.5m-1m above the rebound action surface.

[0008] Optionally, the bracket includes a support rod, and the support rod is extended in a vertical direction; the damping particle delivery assembly is fixedly arranged on the support rod, or the setting position of the damping particle delivery assembly relative to the support rod is adjustable.

[0009] Optionally, the bracket further includes a plate portion, the rebound action surface is located on an upper surface of the plate portion, and the detection unit is arranged on the upper surface of the plate portion.

[0010] Optionally, the plate portion is made of the same material as the damper shell suitable for the damping particles to be measured; and / or the plate portion is a rectangular plate with a plate surface size greater than 500mm×500mm; and / or the plate portion is a plate with a thickness of not less than 10mm.

[0011] Optionally, the bracket further comprises a base and a support for fixed installation, the support rod is fixedly installed on the base, and the plate portion is fixedly installed on the support.

[0012] Optionally, the damping particle delivery assembly includes a damping particle accommodating portion and a shielding portion, the damping particle accommodating portion is fixedly arranged, is provided with a cavity for accommodating the damping particles to be tested, and the delivery port is opened at the bottom of the cavity; the shielding portion is located below the damping particle accommodating portion, and can be switched between a shielding state and a delivery state relative to the damping particle accommodating portion; when the shielding portion is in the shielding state, it can block the delivery port of the damping particle accommodating portion, and when the shielding portion is in the delivery state, the shielding portion releases the blocking of the delivery port.

[0013] Optionally, the damping particle delivery assembly further comprises a connection portion, and is arranged on the support rod via the connection portion, and the damping particle accommodating portion is arranged on the connection portion.

[0014] Optionally, the shielding portion is rotatably disposed on the connecting portion, or is rotatably disposed on the supporting rod to be rotatably switched between the shielding state and the delivery state.

[0015] Optionally, the shielding portion is slidably disposed at the bottom of the damping particle accommodating portion to move and switch between the shielding state and the releasing state.

[0016] Compared with the prior art, this solution provides a damping particle restitution coefficient test device in a different way. Specifically, the damping particle delivery component of the test device is arranged on a bracket for delivering the damping particles to be tested. The bracket has a rebound action surface, and the rebound action surface is located below the delivery port of the damping particle delivery component. The detection unit arranged on the bracket below the delivery port is used to detect the moment when the damping particles to be tested collide with the rebound action surface. The control unit is used to obtain the damping particle restitution coefficient according to the moment when the freely falling damping particles collide with the rebound action surface. Compared with the relatively complex measuring equipment such as high-speed cameras and ultrasonic shot peening devices, this solution uses the detection unit to measure the collision moment to obtain the height after rebound, which can effectively simplify the test process and has high convenience and real-time performance.

[0017] In addition, in a specific implementation, the detection unit can be a vibration acceleration sensor, and the control unit is used to obtain the coefficient of restitution of the damping particle according to the first moment when the freely falling damping particle collides with the rebound surface for the first time and the second moment when the damping particle collides with the rebound surface for the second time. With such a setting, the price of the sensor is lower than that of the high-speed camera, which can effectively save the testing cost; at the same time, the accuracy of recording the collision moment by the sensor is controllable, which can avoid the errors that may be generated by analyzing the video data, ensure the test accuracy requirements, and meet the needs of different engineering application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a damping particle restitution coefficient testing device provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a dynamic matching relationship of a shielding part provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of a dynamic matching relationship of another shielding portion provided in an embodiment of the present application;

[0021] Figure 4 A block diagram of a damping particle restitution coefficient testing method provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the process of continuous collision between the damping particles and the rebound action surface provided in an embodiment of the present application.

[0023] In the figure:

[0024] The bracket 10, the first bracket 11, the base 111, the support rod 112, the second bracket 12, the plate 121, the support 122, the rebound action surface 1211, the damping particle delivery assembly 20, the damping particle accommodating portion 21, the cavity 211, the delivery port 212, the shielding portion 22, the connecting portion 23, the detection unit 30, the control unit 40, and the damping particles 50. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] In the technical implementation of related vibration absorption capabilities, damping particles are widely used, such as but not limited to damping particle dampers in which damping particles are built into the damper housing. Among them, the damping particle restitution coefficient is a physical quantity that characterizes the energy dissipation effect caused by the relative motion of damping particles during a collision. In the process of studying the dynamic behavior of damping particles, the accurate damping particle restitution coefficient is an important technical indicator to ensure the needs of related research and engineering application scenarios, such as but not limited to measuring the effectiveness of the damping particle material to be tested in absorbing collision energy and reducing vibration and noise.

[0027] Based on this, the present application embodiment provides a damping particle restitution coefficient test device. Figure 1 , which is a structural schematic diagram of a damping particle restitution coefficient testing device provided in an embodiment of the present application.

[0028] like Figure 1 As shown, the damping particle restitution coefficient testing device includes a bracket 10, a damping particle delivery assembly 20, a detection unit 30 and a control unit 40.

[0029] Among them, the bracket 10 is used as a basic bearing fixed structure, mainly for installing the damping particle delivery component 20 and the detection unit 30, and at the same time providing an action surface for the damping particles to rebound. In a specific implementation, the bracket 10 may include two parts, a first bracket 11 and a second bracket 12. The damping particle delivery component 20 is arranged on the first bracket 11, the detection unit 30 is arranged on the second bracket 12, and the rebound action surface 1211 is located on the second bracket 12 and is arranged opposite to the damping particle delivery component 20. In this way, the damping particles 50 to be tested released by the damping particle delivery component 20 can fall to the rebound action surface 1211 and rebound upward.

[0030] As shown in the figure, the first bracket 11 includes a base 111 and a support rod 112, and the support rod 112 is arranged on the base 111. The support rod 112 is vertically extended so that the damping particle delivery assembly 20 is at the delivery height. In this way, the free fall motion at a certain height can be simulated during the test process to test the rebound characteristics or other related properties of the damping particles, and ensure that the damping particles 50 have a certain speed and energy when falling to the rebound action surface 1211.

[0031] In a specific implementation, the fixed position of the damping particle delivery assembly 20 on the support rod 112 can be adjusted as needed. For example, the damping particle delivery assembly 20 can be mounted on the support rod 112 through the connecting portion 23, and the connecting portion 23 can be sleeve-shaped, and is screwed and fixed to the support rod 112 by a threaded fastener (not shown in the figure) laterally installed on the sleeve-shaped connecting portion 23. With such a configuration, when adjusting the damping particle delivery height according to actual test requirements, the threaded fastener can be loosened first, and then the damping particle delivery assembly 20 can be adjusted to a predetermined test height, and then the threaded fastener can be tightened to achieve fixation.

[0032] It is understandable that the height adjustment of the damping particle delivery assembly 20 relative to the support rod 112 can be achieved by adopting other structural forms, which will not be described in detail here.

[0033] In other possible implementations, the damping particle delivery assembly 20 may be fixedly connected to the support rod 112. In other words, for a fixed position determined in an actual test scenario, the damping particle delivery assembly 20 may be fixed to the support rod 112 through the connection portion 23, and the damping particles 50 may also have a certain speed and energy when falling to the rebound action surface 1211. This is not limited in the present application.

[0034] In this embodiment, the second bracket 12 includes a plate portion 121 and a support 122, and the plate portion 121 is fixedly arranged on the support 122, that is, the plate portion 121 is rigidly connected to the support 122 to form a second bracket 12 with good overall rigidity. Accordingly, the rebound action surface 1211 is located on the upper surface of the plate portion 121. It has the characteristics of simple and reliable structure.

[0035] For example, the plate portion 121 may be a rectangular plate with a plate surface size greater than 500 mm×500 mm. It should be understood that the shape and size of the plate portion 121 may be determined according to the actual test scenario requirements, such as but not limited to a circular or other shape, as long as it can meet the functional requirements of the falling, collision and rebound of the damping particles to be tested, it is within the scope of protection requested by the present application.

[0036] In other exemplary embodiments, the plate portion 121 can be made of a plate with a thickness of 10 mm, or can also be made of a plate with a thickness greater than 10 mm. In this way, deformation of the plate portion can be prevented and rigid collision of the damping particles can be ensured. When the damping particle 50 to be tested collides with the rebound action surface 1211 of the plate portion 121, the kinetic energy will be converted into deformation energy and thermal energy. This embodiment uses a plate portion 121 of a certain thickness so that more kinetic energy is converted into deformation energy instead of thermal energy, thereby improving the rebound efficiency of the damping particle 50 and improving the test accuracy. At the same time, a relatively thick plate can more effectively absorb and disperse deformation energy, reduce energy loss after deformation, and thus promote the rebound of the damping particle 50.

[0037] In order to further improve the test accuracy, preferably, the plate portion 121 can be made of the same material as the damper housing to maximize the approximation to the actual engineering application scenario of the damping particles to be tested.

[0038] Of course, in other possible implementations, the first bracket 11 and the second bracket 12 may be an integrated structure (not shown in the figure) to improve the overall structural rigidity. The specific selection can be based on the overall design of the product, and the embodiment of the present application is not limited.

[0039] Among them, the detection unit 30 is used to detect the moment when the damping particle falls and collides with the rebound action surface 1211. In a specific implementation, the detection unit 30 can be a vibration acceleration sensor to accurately detect the specific moment when the damping particle falls and the rebound action surface 1211 occurs. When a collision occurs, the object will be suddenly affected by the change in acceleration. Taking the piezoelectric vibration acceleration sensor as an example, the sensor set on the rebound action surface 1211 will sense the acceleration change and generate a corresponding charge signal. The generated charge signal is collected and measured by the electrode. On this basis, according to the change in the charge signal, timely recording and analysis can be performed to determine the occurrence of the collision moment.

[0040] For example, the vibration acceleration sensor can be configured as a sensor with a range of not less than 50g (g is the unit of gravity acceleration) and a frequency range of 2Hz to 5000Hz to meet the needs of different test scenarios and have good adaptability.

[0041] As another example, the mass of the vibration acceleration sensor may be no greater than 7 g (grams), so that the impact of a heavier sensor on the detection accuracy can be avoided while the collision moment detection function can be reliably realized.

[0042] In a specific implementation, the vibration acceleration sensor (30) can be arranged at the edge of the plate portion 121. It should be understood that the detection unit 30 can be arranged in the staggered damping particle falling area of ​​the rebound action surface 1211.

[0043] The damping particle delivery assembly 20 includes a damping particle receiving portion 21 and a shielding portion 22. Figure 1As shown, the damping particle receiving portion 21 is fixedly arranged, and a cavity 211 for receiving the damping particle 50 to be measured is arranged thereon, and a delivery port 212 is provided at the bottom of the cavity 211; accordingly, the shielding portion 22 is located below the damping particle receiving portion 21, and can be switched between a shielding state and a delivery state relative to the damping particle receiving portion 21. When the shielding portion 22 is in the shielding state shown in the figure, that is, it blocks the delivery port 212 of the damping particle receiving portion 21, and the damping particle 50 to be measured is placed in the cavity 211 and is in a state to be delivered; when the shielding portion 22 is in the delivery state, the shielding of the delivery port 212 is released, and the damping particle 50 to be measured falls freely.

[0044] In a specific implementation, the damping particle accommodating portion 21 may be fixed on the connecting portion 23 or directly fixed on the supporting rod 112 .

[0045] In a specific implementation, the shielding portion 22 can be rotatably mounted on the connecting portion 23, or can be directly rotatably mounted on the support rod 112. Figure 2 , which is a schematic diagram of the dynamic matching relationship of a shielding part provided in an embodiment of the present application. The shielding part 22 is rotatably arranged on the connecting part 23, such as Figure 2 As shown in the middle left figure, the shielding portion 22 is in a shielding state, and the damping particle 50 to be measured is placed in the cavity 211; Figure 2 As shown in the middle right figure, the shielding portion 22 can be rotated in the direction indicated by the arrow in the figure to a delivery state, thereby releasing the shielding of the delivery port 212.

[0046] In other possible specific implementations, the shielding portion 22 may also be slidably disposed at the bottom of the damping particle accommodating portion 21. Figure 3 , which is a schematic diagram of the dynamic matching relationship of another shielding part provided in an embodiment of the present application. The shielding part 22 is slidably arranged at the bottom of the damping particle accommodating part 21, such as Figure 3 As shown in the middle left figure, the shielding portion 22 is in a shielding state, and the damping particle 50 to be measured is placed in the cavity 211; Figure 3 As shown in the middle right figure, the shielding portion 22 can move along the direction indicated by the arrow in the figure to a delivery state, thereby releasing the shielding of the delivery port 212.

[0047] During the test, after the shielding of the delivery port 212 is released, the damping particles 50 fall freely. For example, the delivery port 212 can be located at a position of 0.6m above the rebound action surface 1211. Of course, according to different test requirements, the delivery port 212 can be located at a position of 0.5m-1m above the rebound action surface 1211, so as to select the corresponding test delivery height according to the needs.

[0048] Based on the detection unit 30, the first time t when the freely falling damping particle 50 collides with the rebounding action surface 1211 for the first time can be measured. 1 and the second time t when the damping particle 50 collides with the rebounding action surface 1211 for the second time 2 , calculate the time difference Δt between two consecutive collisions between the damping particle and the rebound action surface, where "first collision" and "second collision" refer to two consecutive collisions, and calculate the rebound height h of the damping particle 50 after the collision according to the following formula (1): " :

[0049]

[0050] In formula (1):

[0051] g--gravitational acceleration, take 9.8m / s 2 ;

[0052] h * --The rebound height of the damped particle after the i-th collision, where i is a natural number.

[0053] Furthermore, in combination with the initial height of the damping particle 50, the restitution coefficient of the damping particle can be calculated based on the following formula (2):

[0054]

[0055] In formula (2):

[0056] e--coefficient of restitution of the i-th collision.

[0057] In order to improve the test accuracy, the arithmetic mean of the restitution coefficient of the damping particles can be further calculated by formula (3):

[0058]

[0059] In formula (3):

[0060] --The arithmetic mean of the coefficient of restitution of the damping particles, also known as the first arithmetic mean;

[0061] e 4 --The damping particle restitution coefficient calculated by equation (2).

[0062] It should be understood that the above formula (3) is based on an example of testing 5 times, and the coefficient of restitution of the damping particle is calculated respectively and the average value is calculated. The application is not limited to performing 5 effective tests, and the actual number of tests can be determined as needed, which is not limited in the embodiment of the present application.

[0063] In other words, after the damping particle to be tested is released, during the process of continuous collisions between the damping particle and the rebound action surface, the restitution coefficients of multiple collisions are obtained, and the first arithmetic average of the restitution coefficients of the multiple collisions is used as the restitution coefficient of the damping particle to be tested. Figure 5 , which is a schematic diagram of the process of continuous collision between the damping particle and the rebound action surface provided in the embodiment of the present application. It should be noted that, ideally, the rebound of the damping particle to be measured is vertically upward. Here, for the convenience of marking variables, the motion trajectory of the damping particle is horizontally stretched to represent it.

[0064] In order to further improve the test accuracy, the recovery coefficient of the above multiple collisions can be: excluding the time difference Δt between the first collision of the damping particle to be tested and the rebound surface and the two adjacent collisions with the rebound surface is less than 10 -3 In other words, the first collision of the damping particles to be tested is excluded to avoid the possible impact of the device deployment; at the same time, the time difference Δt in the post-collision oscillation process is excluded to be less than 10 -3 s collision to avoid the possible impact of damping particles due to energy loss in collision.

[0065] Based on the above-mentioned damping particle restitution coefficient testing device, the embodiment of the present application also provides a damping particle restitution coefficient testing method.

[0066] First of all, in order to obtain a more accurate test structure, test conditions need to be prepared. First, for the test site, it is preferred to choose a rigid ground or other rigid bearing to reliably place the damping particle restitution coefficient test device. Second, when the test is in progress, there should be no vibration or sound source around the test device that may affect the test results. Third, the test is preferably carried out at an ambient temperature of 18°C ​​to 25°C, and the ambient wind speed is less than 0.5m / s.

[0067] In addition, for the damping particles (samples) to be tested, it is necessary to ensure that there are no impurities and grease attached to the surface of the damping particles, and the damping particles can be ultrasonically cleaned when necessary. The embodiments of the present application are not limited thereto.

[0068] See also Figure 4 , which is a block diagram of a damping particle restitution coefficient testing method provided in an embodiment of the present application.

[0069] The damping particle restitution coefficient test method comprises the following steps:

[0070] S401, releasing damping particles to be tested;

[0071] S402, obtaining a time difference Δt between two consecutive collisions between the damping particle 50 and the rebound action surface;

[0072] S403, calculating the rebound height h of the damping particle 50 according to the time difference Δt between two adjacent collisions with the rebound action surface " ;

[0073] S404, according to the rebound height h of the damping particle 50 * and rebound height h 45" , that is, the two adjacent rebound heights, calculate the restitution coefficient e of the damping particle.

[0074] As mentioned above, in order to further improve the test accuracy, multiple valid tests can be performed to obtain the average value:

[0075] S405, according to the coefficient of restitution of the damping particles obtained from multiple tests, the arithmetic mean value is calculated as the coefficient of restitution of the damping particle 50 to be tested. That is, after the damping particle to be tested is released, in the process of the collision between the damping particle and the rebound action surface, the coefficient of restitution of multiple collisions is obtained, and the first arithmetic mean value of the coefficient of restitution of the multiple collisions is used as the coefficient of restitution of the damping particle. In this way, it can be ensured that when evaluating the damping characteristics of the material, each test can be accurately and repeatedly performed under controlled conditions, so as to obtain reliable and consistent test data.

[0076] In addition, in order to further improve the test accuracy, the aforementioned test of placing the damping particles to be tested may include placing a plurality of the damping particles to be tested of the same material and the same size, and taking the second arithmetic average of the coefficient of restitution of each of the damping particles as the coefficient of restitution of the damping particle. The specific method can be selected according to the actual engineering needs, so that the influence of differences such as the mass density of the damping particles to be tested on the coefficient of restitution of the damping particles to be tested of the determined material and size can be further avoided. In other words, by conducting multiple tests on multiple damping particles of the same material and the same size, the average coefficient of restitution of the material under specific particle size conditions is obtained.

[0077] The above-mentioned test method can be implemented by the control unit 40. For example, but not limited to, the control unit 40 can be constructed to form a data acquisition and analysis system, which can be specifically composed of a data acquisition front end, analysis software and a computer. Those skilled in the art can implement it based on existing technologies and will not be repeated here.

[0078] In the specific implementation, the A / D conversion resolution is not less than 24 bits, and anti-aliasing filtering and high-pass filtering should be used in the data acquisition and analysis system to eliminate the influence of aliasing and trend items.

[0079] Compared with the use of relatively complex measuring equipment such as high-speed cameras and ultrasonic shot peening devices, the application of this solution uses sensors to measure the height after rebound at the moment of collision, which can effectively simplify the test process and has high convenience and real-time performance. In addition, the price of sensors is lower than that of high-speed cameras, which can effectively save test costs; at the same time, analyzing video data will produce errors, and using sensors to record the time error of collision impact is small, which can ensure the test accuracy requirements.

[0080] In addition to the aforementioned damping particle restitution coefficient testing method and apparatus, an embodiment of the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the damping particle restitution coefficient testing method as described above.

[0081] Through the description of the above implementation methods, technical personnel in this field can clearly understand that the present application can be implemented through hardware, and can also be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, an electronic device, or a network device, etc.) to execute the damping particle restitution coefficient test method described in the present application.

[0082] It should be understood that the ordinal numbers "first" and "second" used herein are only used to describe the same functional components or structures in the technical solution. It is understandable that the use of the above ordinal numbers does not constitute an understanding of the technical solution for which protection is sought in this application.

[0083] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications 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 damping particle restitution coefficient test device, characterized in that: It includes a bracket, a damping particle delivery component, a detection unit and a control unit; The damping particle delivery component is arranged on the bracket, and the damping particle delivery component has a delivery port for the damping particles to be tested to pass through and fall freely; The bracket has a rebound action surface, and the rebound action surface is located below the delivery port; The detection unit is arranged on the bracket below the delivery port, and is used to detect the moment when the damping particle to be detected collides with the rebound action surface; The control unit is used to obtain the damping particle restitution coefficient according to the moment when the freely falling damping particles collide with the rebound action surface.

2. The damping particle restitution coefficient testing device according to claim 1, characterized in that: The detection unit is a vibration acceleration sensor, and the control unit is used to obtain the damping particle recovery coefficient according to a first moment when the freely falling damping particle collides with the rebound action surface for the first time and a second moment when the damping particle collides with the rebound action surface for the second time.

3. The damping particle restitution coefficient testing device according to claim 1 or 2, characterized in that: The delivery port is located at a position of 0.5m-1m above the rebound action surface.

4. The damping particle restitution coefficient testing device according to claim 1, characterized in that: The bracket includes a support rod and a plate portion, the support rod is extended in a vertical direction; the damping particle delivery assembly is fixedly arranged on the support rod, or the setting position of the damping particle delivery assembly relative to the support rod is adjustable; the bracket also includes that the rebound action surface is located on the upper surface of the plate portion, and the detection unit is arranged on the upper surface of the plate portion.

5. The damping particle restitution coefficient testing device according to claim 4, characterized in that: The plate portion is made of the same material as the damper shell adapted for the damping particles to be measured; and / or, the plate portion is a rectangular plate with a plate surface size greater than 500mm×500mm; and / or, the plate portion is a plate with a thickness of not less than 10mm.

6. The damping particle restitution coefficient testing device according to claim 5, characterized in that: The bracket also includes a base and a support for fixed installation, the support rod is fixedly arranged on the base, and the plate portion is fixedly arranged on the support.

7. The damping particle restitution coefficient testing device according to any one of claims 4 to 5, characterized in that: The damping particle delivery assembly includes a damping particle accommodating portion and a shielding portion. The damping particle accommodating portion is fixedly arranged, and is provided with a cavity for accommodating the damping particles to be tested, and the delivery port is opened at the bottom of the cavity; the shielding portion is located below the damping particle accommodating portion, and can be switched between a shielding state and a delivery state relative to the damping particle accommodating portion; when the shielding portion is in the shielding state, the delivery port of the damping particle accommodating portion can be blocked, and when the shielding portion is in the delivery state, the shielding of the delivery port is released.

8. The damping particle restitution coefficient testing device according to claim 7, characterized in that: The damping particle delivery component further comprises a connection portion, and is arranged on the support rod through the connection portion, and the damping particle accommodating portion is arranged on the connection portion.

9. The damping particle restitution coefficient testing device according to claim 8, characterized in that: The shielding portion is rotatably arranged on the connecting portion, or is rotatably arranged on the supporting rod, so as to be rotatably switched between the shielding state and the releasing state.

10. The damping particle restitution coefficient testing device according to claim 8, characterized in that: The shielding portion is slidably arranged at the bottom of the damping particle accommodating portion to move and switch between the shielding state and the releasing state.

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