A floor impact resistance testing device and its testing method

By automating the control of the drive components, fixed lifting devices, and lifting devices, the problems of manually adjusting the guide tubes and placing metal balls in existing floor impact testing devices have been solved, realizing automated repeated impact testing of metal balls and improving work efficiency and adaptability.

CN116793865BActive Publication Date: 2026-03-06JIANGXI FUHUANG STEEL STRUCTURE CO LTD
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Patent Information

Application Number
CN202311014178.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-14
Publication Date
2026-03-06
Estimated Expiration
2043-08-14

AI Technical Summary

Technical Problem

Existing floor impact testing devices require manual adjustment of the guide tube height and placement of metal balls multiple times, resulting in high physical exertion and low efficiency for staff.

Method used

The device employs a pusher assembly, a fixed lifting device, and a lifting device to automatically control the falling and recovery of the metal ball. The lifting and lowering of the guide tube is achieved through an elastic telescopic rod and a motor-driven mechanism, enabling automatic repeated impact detection of the metal ball.

Benefits of technology

It reduces the physical exertion of staff, improves testing efficiency, and enables the fixing and adjustment of guide tubes of different diameters and heights, thus realizing automated repeated impact testing of metal balls.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention belongs to the field of floor impact resistance testing technology, specifically relating to a floor impact resistance testing device and method. The device includes a base, an operating table fixedly connected to the upper side of the base, a floor body placed on the upper side of the operating table, a guide tube positioned above the floor body, a pushing component and a fixed lifting device positioned above the base, and a guide component and a lifting device fixedly connected to the upper side of the base. This floor impact resistance testing device, through the use of the pushing component, fixed lifting device, guide component, and lifting device, allows a metal ball to impact the floor once. After impacting the floor, the metal ball falls to the bottom of the guide tube. Then, as the guide tube rises, it drives a positioning block to rise, causing a push plate to push the metal ball to an auxiliary platform on the operating table, where it slides back onto the moving seat. This facilitates continuous impact of the metal ball on the floor, reducing the physical exertion of workers and improving work efficiency.
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Description

Technical Field

[0001] This invention relates to the field of floor impact resistance testing technology, specifically to a floor impact resistance testing device and its testing method. Background Technology

[0002] Impact resistance is an indicator that directly reflects, evaluates, or judges the brittleness and toughness of a material or product in terms of its ability to resist impact. In construction, the impact resistance of flooring is extremely important. When testing the impact resistance of flooring, it is generally done using a floor impact resistance testing device. The testing procedure is as follows: a metal ball is moved to a certain distance above a conduit, with the conduit in a vertical position and its bottom in contact with the floor. Then, the metal ball is lowered and allowed to fall freely onto the floor. The impact resistance of the flooring is then observed to determine whether dents or cracks appear.

[0003] Currently, existing floor impact resistance testing devices require multiple tests on the floor's impact resistance performance. This process necessitates adjusting the height of the conduit and continuously testing with metal balls falling freely. This method requires manual repetition of placing the fallen metal balls back onto the top of the conduit, which is physically demanding and inefficient. Therefore, we propose a floor impact resistance testing device and its testing method. Summary of the Invention

[0004] The main objective of this invention is to provide a floor impact resistance testing device and method, which can solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention proposes a floor impact resistance testing device and method, comprising a base, an operating table fixedly connected to the upper side of the base, a floor body placed on the upper side of the operating table, a guide tube disposed above the floor body, a pushing component and a fixed lifting device disposed above the base, and a guide component and a lifting device fixedly connected to the upper side of the base. The pushing component includes:

[0006] A fixing frame is fixedly connected to the upper outer wall of the base;

[0007] An elastic telescopic rod is fixedly connected to the outer wall of the fixed frame;

[0008] A push plate, which is fixedly connected to the telescopic end of the elastic telescopic rod;

[0009] A rotating rod, which is positioned above the elastic telescopic rod;

[0010] and a hinge rod, wherein the hinge rod is hinged to the telescopic end of the elastic telescopic rod.

[0011] Preferably, a support rod is fixedly connected to the outer wall of the operating table, and a fixed rod is fixedly connected to the outer wall of the support rod. The fixed rod passes through the rotating rod and is rotatably connected to the rotating rod. The lower side of the rotating rod is hinged to the hinge rod. By using the hinge rod, when the rotating rod rotates counterclockwise, the telescopic end of the elastic telescopic rod can be extended, which makes it easier for the push plate to push the metal ball into the adjusting telescopic cylinder.

[0012] Preferably, the inner wall of the rotating rod is penetrated by the T-rod and slidably connected to the T-rod, and the T-rod and the inner wall of the rotating rod are elastically connected by a return spring.

[0013] Preferably, the fixed lifting device includes a fixed base, a lead screw is rotatably connected to the inner wall of the fixed base, a threaded block is threadedly connected to the lead screw, a clamping mechanism is fixedly connected to the outer wall of the threaded block, a motor is fixedly connected to the top of the fixed base, and the output shaft of the motor is fixedly connected to the lead screw.

[0014] Preferably, the guide assembly includes an adjustable telescopic cylinder, which is fixedly connected to the outer wall of the base. A sliding groove is provided on the outer wall of the adjustable telescopic cylinder. A guide plate is fixedly connected to the outer wall of the adjustable telescopic cylinder. A fixing ring is fixedly connected to the end of the guide plate away from the adjustable telescopic cylinder. An auxiliary component is fixedly connected to the outer wall of the adjustable telescopic cylinder.

[0015] Preferably, the outer wall of the adjusting telescopic cylinder has an opening, and an auxiliary platform is fixedly connected to the outer wall of the operating table, with the opening aligned with the auxiliary platform of the operating table.

[0016] Preferably, the auxiliary component includes a pneumatic chamber, which is fixedly connected to the outer wall of the adjusting telescopic cylinder. A piston in the pneumatic chamber is connected to a push rod, and a piston at the end of the pneumatic chamber away from the push rod is connected to a push rod. The push rod is elastically connected to the inner wall of the pneumatic chamber by a spring. Through the use of the pneumatic chamber, the push rod, and the push rod, when the moving seat rises to the top, the push rod can push out the metal ball.

[0017] Preferably, the lifting device includes an electric rail, in which a sliding seat is slidably connected, and a connecting member is fixedly connected to the sliding seat. A movable seat is fixedly connected to the end of the connecting member away from the sliding seat, and a fixing block is fixedly connected to the outer wall of the movable seat. By using the electric rail, the sliding seat can be driven to rise and fall, thereby causing the connecting member to drive the movable seat to rise and fall.

[0018] Preferably, the upper side of the movable seat is concave, and a positioning block is fixedly connected to the outer wall of the guide tube. The concave shape of the movable seat makes it easy for the metal ball to stick firmly to the movable seat when it rises, preventing it from rolling.

[0019] The present invention provides a testing method for a floor impact resistance testing device, which specifically includes the following steps:

[0020] S1. First, fix the guide tube on the clamping mechanism, then start the motor. The output shaft of the motor drives the lead screw to rotate, which in turn causes the threaded block to drive the clamping mechanism to descend, moving the guide tube to be in contact with the floor body.

[0021] S2. Start the electric rail, which drives the sliding seat to slide in the electric rail, thereby driving the moving seat to rise. The metal ball on the moving seat moves to the top of the adjusting telescopic cylinder, causing the fixed block to press the top rod. Under the action of the air pressure chamber, the push rod pushes the metal ball on the moving seat to slide off the guide plate onto the fixed ring. Then, the electric baffle in the fixed ring is activated to open, allowing the metal ball in the fixed ring to fall and impact the floor body, thus testing the impact resistance of the floor body.

[0022] S3. After the metal ball impacts the floor body, start the motor. The motor's output shaft drives the lead screw to reverse, which in turn causes the threaded block to drive the clamping mechanism to rise, causing the guide tube to move upward. This causes the positioning block to press the T-rod to slide on the inner wall of the rotating rod. At the same time, the rotating rod rotates around the center of the fixed rod. Under the action of the hinge rod, the telescopic end of the elastic telescopic rod extends, causing the push plate to push the metal ball to slide down onto the auxiliary platform of the operating table, thus causing the metal ball to roll back onto the moving seat.

[0023] S4. Then, by repeating the action in S2, the impact resistance of the floor body is continuously tested.

[0024] Beneficial effects

[0025] This invention provides a floor impact resistance testing device. It has the following advantages:

[0026] (1) The floor impact testing device uses a push component, a fixed lifting device, a guide component and a lifting device to make the metal ball fall to the bottom of the guide tube after impacting the floor once. At this time, after the guide tube rises, it drives the positioning block to rise, which in turn squeezes the T rod, causing the rotating rod to rotate. Then, under the action of the hinge rod, it can drive the extension end of the elastic telescopic rod to extend, so that the push plate pushes the metal ball to the auxiliary table of the operating table, slides down and rolls back to the moving seat, which makes it easier for the metal ball to continuously hit the floor, reducing the physical exertion of the staff and improving work efficiency.

[0027] (2) The floor impact resistance testing device can fix guide tubes of different diameters by using a fixed lifting device, which makes it easy to lift the guide tubes and make the metal ball on the upper side of the floor body roll onto the moving seat.

[0028] (3) The floor impact resistance testing device can adjust the height of the telescopic cylinder by using the guide component for guide tubes of different heights, thereby adjusting the height of the fixing ring so that the metal ball can be at different heights, which is convenient for different degrees of impact resistance testing of the floor body. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0031] Figure 2 This is a schematic diagram of a portion of the three-dimensional structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the internal structure of the rotating rod of the present invention;

[0033] Figure 4 This is a schematic diagram of the guiding component structure of the present invention;

[0034] Figure 5 This is a cross-sectional view of the guide component of the present invention;

[0035] Figure 6 This is a schematic diagram of the lifting device of the present invention.

[0036] Explanation of reference numerals: 1. Base; 2. Operating table; 3. Floor body; 4. Guide tube; 5. Pushing assembly; 6. Fixed lifting device; 7. Guide assembly; 8. Lifting device; 41. Positioning block; 51. Fixing frame; 52. Elastic telescopic rod; 53. Push plate; 54. Support rod; 55. Fixing rod; 56. Rotating rod; 57. Hinge rod; 561. T-rod; 562. Return spring; 61. Fixed seat; 62. Lead screw; 63. Threaded block; 64. Clamping mechanism; 65. Motor; 71. Adjustable telescopic cylinder; 72. Slide groove; 73. Guide plate; 74. Fixing ring; 75. Auxiliary assembly; 751. Air chamber; 752. Top rod; 753. Push rod; 81. Electric rail; 82. Sliding seat; 83. Connector; 84. Moving seat; 85. Fixing block.

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of 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.

[0039] Please see Figures 1-6 This invention proposes a floor impact resistance testing device and method, comprising a base 1, an operating platform 2 fixedly connected to the upper side of the base 1 for placing the floor body 3, the floor body 3 being placed on the upper side of the operating platform 2, and a guide tube 4 disposed above the floor body 3 for guiding a metal ball that falls onto the floor body 3. A pushing component 5 and a fixing and lifting device 6 are disposed above the base 1. The pushing component 5 can push the metal ball on the floor body 3 back onto the auxiliary platform of the operating platform 2. The fixing and lifting device 6 can fix the guide tube 4 and simultaneously adjust its height. The pushing component 5 includes a fixed frame 51, which is fixedly connected to the upper outer wall of the base 1. An elastic telescopic rod 52 is fixedly connected to the outer wall of the fixed frame 51. A push plate 53 is fixedly connected to the telescopic end of the elastic telescopic rod 52. A rotating rod 56 is provided above the elastic telescopic rod 52. A hinge rod 57 is hinged to the telescopic end of the elastic telescopic rod 52. A guide component 7 and a lifting device 8 are fixedly connected to the upper side of the base 1. By using the guide component 7 and the lifting device 8, the metal ball that falls onto the floor body 3 can return to the top of the guide tube 4 and fall again, reducing the physical exertion of the workers and improving work efficiency.

[0040] In an embodiment of the present invention, in order to fix the guide tube 4 and simultaneously drive the guide tube 4 to move up and down, the fixing and lifting device 6 specifically includes a fixing base 61. A lead screw 62 is rotatably connected to the inner wall of the fixing base 61. A threaded block 63 is threadedly connected to the lead screw 62. A clamping mechanism 64 is fixedly connected to the outer wall of the threaded block 63. The clamping mechanism 64 is an existing clamping device that can fix guide tubes 4 of different diameters. A motor 65 is fixedly connected to the top of the fixing base 61, and the output shaft of the motor 65 is fixedly connected to the lead screw 62. By starting the motor 65, the lead screw 62 is driven to rotate, thereby driving the threaded block 63 to slide, so that the clamping mechanism 64 can drive the guide tube 4 to move up and down.

[0041] Furthermore, in order to automatically push the metal ball that falls onto the floor body 3 into the guide assembly 7, specifically, a positioning block 41 is fixedly connected to the outer wall of the guide tube 4, a support rod 54 is fixedly connected to the outer wall of the operating table 2, a fixing rod 55 is fixedly connected to the outer wall of the support rod 54, the fixing rod 55 passes through the rotating rod 56 and is rotatably connected to the rotating rod 56, the lower side of the rotating rod 56 is hinged to the hinge rod 57, the inner wall of the rotating rod 56 is penetrated by a T-rod 561 and is slidably connected to the T-rod 561, and the T-rod 56... 1 is elastically connected to the inner wall of the rotating rod 56 through the return spring 562. When the guide tube 4 is driven to rise by the clamping mechanism 64, the positioning block 41 can be driven to rise, thereby causing the positioning block 41 to press the T rod 561 to slide on the inner wall of the rotating rod 56. At the same time, the rotating rod 56 rotates around the center of the fixed rod 55. Under the action of the hinge rod 57, the telescopic end of the elastic telescopic rod 52 is extended, which drives the push plate 53 to push the metal ball to the auxiliary platform of the operating table 2 and slide it down, so that the metal ball can automatically slide into the guide assembly 7.

[0042] Furthermore, in order to automatically transport the metal ball and continuously test its impact on the floor body 3, specifically, an opening is provided on the outer wall of the adjusting telescopic cylinder 71, and an auxiliary platform is fixedly connected to the outer wall of the operating platform 2. The opening is aligned with the auxiliary platform of the operating platform 2, so that the metal ball can slide into the opening and enter the adjusting telescopic cylinder 71. The guide assembly 7 includes the adjusting telescopic cylinder 71, which is fixedly connected to the outer wall of the base 1. A groove 72 is provided on the outer wall of the adjusting telescopic cylinder 71. A guide plate 73 is fixedly connected to the outer wall of the telescopic cylinder 71 to guide the metal ball as it slides onto the fixed ring 74. A fixed ring 74 is fixedly connected to the end of the guide plate 73 away from the telescopic cylinder 71. An electric baffle is provided in the fixed ring 74, allowing the metal ball on the fixed ring 74 to fall automatically when the baffle is opened. An auxiliary component 75 is fixedly connected to the outer wall of the telescopic cylinder 71. The auxiliary component 75 includes a pneumatic chamber 751, which is fixedly connected to the outer wall of the telescopic cylinder 71. In the upper part of the air pressure chamber 751, a piston is connected to a push rod 752. At the end of the air pressure chamber 751 furthest from the push rod 752, a piston is connected to a push rod 753. When the movable seat 84 rises to the top of the adjusting telescopic cylinder 71, the fixed block 85 presses against the push rod 752, thereby driving the push rod 753 to push the metal ball on the movable seat 84. The metal ball then slides down the guide plate 73 onto the fixed ring 74. The push rod 753 is elastically connected to the inner wall of the air pressure chamber 751 via a spring. The lifting device 8 includes an electric rail 81 in which a sliding mechanism... A sliding seat 82 is connected, and a connector 83 is fixedly connected to the sliding seat 82. A movable seat 84 is fixedly connected to the end of the connector 83 away from the sliding seat 82. The upper side of the movable seat 84 is concave, and a fixing block 85 is fixedly connected to the outer wall of the movable seat 84. By activating the electric rail 81, the sliding seat 82 can be driven to slide in the electric rail 81, so that the connector 83 drives the movable seat 84 to rise and fall, thereby achieving the effect of automatically conveying the metal ball, which facilitates the continuous impact detection of the metal ball on the floor body 3.

[0043] The present invention provides a testing method for a floor impact resistance testing device, which specifically includes the following steps:

[0044] S1. First, fix the guide tube 4 on the clamping mechanism 64, then start the motor 65. The output shaft of the motor 65 drives the lead screw 62 to rotate, which in turn causes the threaded block 63 to drive the clamping mechanism 64 to descend, moving the guide tube 4 to be in contact with the floor body 3.

[0045] S2. Start the electric rail 81, which drives the sliding seat 82 to slide in the electric rail 81, thereby driving the moving seat 84 to rise. Move the metal ball on the moving seat 84 to the top of the adjusting telescopic cylinder 71, so that the fixed block 85 presses the top rod 752. Under the action of the air pressure chamber 751, the push rod 753 pushes the metal ball on the moving seat 84 to slide off the guide plate 73 onto the fixed ring 74. Then, start the electric baffle in the fixed ring 74 to open, so that the metal ball in the fixed ring 74 falls and impacts the floor body 3, thus testing the impact resistance of the floor body 3.

[0046] S3. After the metal ball impacts the floor body 3, the motor 65 is started. The output shaft of the motor 65 drives the lead screw 62 to reverse, which in turn causes the threaded block 63 to drive the clamping mechanism 64 to rise, which in turn causes the guide tube 4 to move upward, so that the positioning block 41 presses the T rod 561 to slide on the inner wall of the rotating rod 56. At the same time, the rotating rod 56 rotates around the center of the fixed rod 55. Under the action of the hinge rod 57, the telescopic end of the elastic telescopic rod 52 is extended, which drives the push plate 53 to push the metal ball to the auxiliary table of the operating table 2 and slide it down, so that the metal ball rolls back onto the moving seat 84.

[0047] S4. Then, by repeating the action of S2, the impact resistance of the floor body 3 is continuously tested.

[0048] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A floor impact resistance detection apparatus comprising a base (1), characterised in that: The upper side of the base (1) is fixedly connected with an operation table (2), the upper side of the operation table (2) is placed with a floor body (3), the upper side of the floor body (3) is provided with a guide pipe (4), the upper side of the base (1) is provided with a pushing assembly (5) and a fixed lifting device (6), the upper side of the base (1) is fixedly connected with a guide assembly (7) and a lifting device (8), the pushing assembly (5) comprises: A fixed frame (51) is fixedly connected to the upper side outer wall of the base (1); An elastic telescopic rod (52) is fixedly connected to the outer wall of the fixed frame (51); A push plate (53) is fixedly connected to the telescopic end of the elastic telescopic rod (52); A rotating rod (56) is arranged above the elastic telescopic rod (52); And a hinged rod (57) is hinged to the telescopic end of the elastic telescopic rod (52); A support rod (54) is fixedly connected to the outer wall of the operation table (2), a fixed rod (55) is fixedly connected to the outer wall of the support rod (54), the fixed rod (55) penetrates through the rotating rod (56) and is rotatably connected with the rotating rod (56), the lower side of the rotating rod (56) is hinged to the hinged rod (57); The inner wall of the rotating rod (56) is penetrated by a T-shaped rod (561) and is slidingly connected with the T-shaped rod (561), the T-shaped rod (561) and the inner wall of the rotating rod (56) are elastically connected by a return spring (562); A positioning block (41) is fixedly connected to the outer wall of the guide pipe (4), the fixed lifting device (6) drives the guide pipe (4) to move upward, so that the positioning block (41) extrudes the T-shaped rod (561) to slide in the inner wall of the rotating rod (56).

2. The floor impact detection apparatus of claim 1, wherein: The fixed lifting device (6) comprises a fixed seat (61), a lead screw (62) is rotatably connected to the inner wall of the fixed seat (61), a threaded block (63) is threadedly connected to the lead screw (62), a clamping mechanism (64) is fixedly connected to the outer wall of the threaded block (63), a motor (65) is fixedly connected to the top of the fixed seat (61), and the output shaft of the motor (65) is fixedly connected with the lead screw (62).

3. The floor impact detection apparatus of claim 2, wherein: The guide assembly (7) comprises an adjusting telescopic cylinder (71), the adjusting telescopic cylinder (71) is fixedly connected to the outer wall of the base (1), a sliding groove (72) is formed in the outer wall of the adjusting telescopic cylinder (71), a guide plate (73) is fixedly connected to the outer wall of the adjusting telescopic cylinder (71), a fixed ring (74) is fixedly connected to the end of the guide plate (73) away from the adjusting telescopic cylinder (71), and an auxiliary assembly (75) is fixedly connected to the outer wall of the adjusting telescopic cylinder (71).

4. The floor impact detection apparatus of claim 3, wherein: A through opening is formed in the outer wall of the adjusting telescopic cylinder (71), an auxiliary table is fixedly connected to the outer wall of the operation table (2), and the through opening is aligned with the auxiliary table of the operation table (2).

5. The floor impact detection apparatus of claim 4, wherein: The auxiliary assembly (75) comprises an air pressure bin (751), the air pressure bin (751) is fixedly connected on the outer wall of the adjusting telescopic cylinder (71), a top rod (752) is connected with the piston in the air pressure bin (751), a push rod (753) is connected with the piston at the end of the air pressure bin (751) away from the top rod (752), and the push rod (753) is elastically connected with the inner wall of the air pressure bin (751) through a spring.

6. The floor impact detection apparatus of claim 5, wherein: The lifting device (8) comprises an electric rail (81), a sliding seat (82) is slidably connected in the electric rail (81), the sliding seat (82) is fixedly connected with a connecting piece (83), one end of the connecting piece (83) away from the sliding seat (82) is fixedly connected with a moving seat (84), and the outer wall of the moving seat (84) is fixedly connected with a fixed block (85).

7. The floor impact detection apparatus of claim 6, wherein: The upper side of the moving seat (84) is concave.

8. The detection method of the floor impact detection device according to claim 7, wherein, Specifically includes the following steps: S1, first fix the guide pipe (4) on the clamping mechanism (64), then start the motor (65), the output shaft of the motor (65) drives the screw rod (62) to rotate, and then the threaded block (63) drives the clamping mechanism (64) to descend, and the guide pipe (4) is moved to be attached to the floor body (3); S2, start the electric rail (81), drive the sliding seat (82) to slide in the electric rail (81), and then drive the moving seat (84) to rise, move the metal ball on the moving seat (84) to the top of the adjusting telescopic cylinder (71), so that the fixed block (85) extrudes the top rod (752), under the action of the air pressure bin (751), the push rod (753) pushes the metal ball on the moving seat (84) to slide off the guide plate (73) and fall on the fixed ring (74), then start the electric baffle in the fixed ring (74) to open, and the metal ball in the fixed ring (74) falls down to impact the floor body (3), and the impact resistance of the floor body (3) is detected; S3, after the metal ball impacts the floor body (3), start the motor (65), the output shaft of the motor (65) drives the screw rod (62) to reverse, and then the threaded block (63) drives the clamping mechanism (64) to ascend, drives the guide pipe (4) to move upwards, extrudes the T-shaped rod (561) on the inner wall of the rotating rod (56), and the rotating rod (56) rotates around the center of the fixed rod (55), under the action of the hinged rod (57), the extension end of the elastic telescopic rod (52) is elongated, the push plate (53) pushes the metal ball to slide off the auxiliary table of the operation table (2), and then the metal ball is rolled to the moving seat (84) again; S4, the impact resistance of the floor body (3) is continuously detected by repeating the action of S2.

Citation Information

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