Rebounding force testing equipment

Abstract

The invention relates to bounce testing equipment, which comprises an equipment base, a fixed screen clamp, a movable screen clamp and a pressure sensor, and is characterized in that the fixed screen clamp is fixed on the equipment base and is used for fixing a first end of a to-be-tested screen; the movable screen clamp is arranged on the equipment base in a sliding manner through the antifriction moving assembly and is used for clamping the second end of the to-be-tested screen; a driving motor is mounted at the rear end of the movable screen clamp and used for driving the movable screen clamp to be far away from or close to the fixed screen clamp in the linear direction; the pressure sensor is mounted on the movable screen clamp and is used for detecting a pressure value applied to the to-be-tested screen in real time; the pressure sensor is electrically connected with a display unit used for displaying force value data in real time, and the maximum force value obtained when the screen fails due to the influence of outer environmental factors can be reduced to the maximum extent.

Description

Technical Field

[0001] The invention relates to a rebound force testing device, belonging to the technical field of screen testing. Background Art

[0002] During the production process of LCD screens, their compressive performance needs to be tested. The testing process mainly includes three steps: loading, testing and unloading.

[0003] When testing the bending strength of existing LCD screens, the curved screen is generally positioned using a fixture. Then, two parallel pressure plates are used to squeeze inward from both the left and right sides of the screen, gradually increasing the applied pressure and observing whether the screen is damaged, thereby determining the screen's bending strength.

[0004] The shortcomings of the existing LCD screen anti-bending testing equipment are that: when performing bending testing on the above-mentioned existing LCD screen, pressure is mainly applied from both sides of the screen toward the middle. However, due to the interference of external environmental factors such as friction, the maximum force that the screen can withstand when it fails will be inaccurate. Summary of the Invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a rebound force testing device, which can minimize the influence of external environmental factors on the maximum force value when the screen fails.

[0006] The technical solutions of the present invention are as follows:

[0007] A rebound force testing device includes a device base, a fixed screen clamp, a movable screen clamp and a pressure sensor, wherein the fixed screen clamp is fixed on the device base and is used to fix the first end of the screen to be tested; the movable screen clamp is slidably set on the device base through a friction-reducing movable component and is used to clamp the second end of the screen to be tested; a driving motor is installed at the rear end of the movable screen clamp to drive it away from or close to the fixed screen clamp in a straight line direction; the pressure sensor is installed on the movable screen clamp to detect the pressure value applied to the screen to be tested in real time; the pressure sensor is electrically connected to a display unit for displaying force value data in real time, which can minimize the influence of external environmental factors on the maximum force value obtained when the screen fails.

[0008] Among them, the anti-friction moving component includes an optical axis horizontally installed on the equipment base, and three sliding wheels arranged in a V shape are installed on the side wall of the movable screen fixture. The optical axis is clamped between the three sliding wheels so that the movable screen fixture can move linearly along the optical axis.

[0009] Among them, the friction-reducing moving component includes a hollow optical shaft and an air flotation ring; the air flotation ring is arranged on the outside of the hollow optical shaft, and a spiral air guide groove is provided on the inner wall of the air flotation ring. An air chamber is provided inside the side wall of the movable screen clamp, and the side wall of the movable screen clamp is sealed and fixedly connected to the outer wall of the air flotation ring. One side of the air chamber is connected to the external air compressor through a flexible air pipe, and the other side of the air chamber is sealed and docked with the air flotation ring through an interface. Radial air holes are provided through the air flotation ring, and the radial air holes connect the air chamber interface and the spiral air guide groove.

[0010] wherein, the movable screen clamp comprises a clamp body and a clamping jaw, the clamping jaw is rigidly locked to the front end face of the clamp body, a spherical base is welded at the center position of the rear end face of the clamping jaw, a concave spherical surface is provided on the spherical base, a floating ball head is nested in the concave spherical surface of the spherical base, the top of the floating ball head is cut into a horizontal mounting plane, and a centering platform is welded to the horizontal mounting plane; the pressure sensor is installed on the centering platform through a bidirectional pre-tightening assembly, the bidirectional pre-tightening assembly includes an anti-loosening bolt, a lower disc spring and an upper disc spring, the lower disc spring is tightly against the end face of the centering platform, the bottom surface of the pressure sensor is crimped to the lower disc spring, and the upper disc spring is tightly against the upper surface of the pressure sensor; the anti-loosening bolt passes through the lower disc spring, the pressure sensor and the upper disc spring in sequence from the centering platform upward, and the top of the anti-loosening bolt is screwed with an anti-loosening nut to form an elastic constraint on the pressure sensor.

[0011] The inner wall and outer wall of the air flotation collar are respectively covered with an inner ceramic layer and an outer ceramic layer; an air storage cavity is provided inside the air flotation collar; the radial air holes penetrate the air storage cavity; a micro-diameter pressure relief hole is penetrated on the top of the air storage cavity; the micro-diameter pressure relief hole is connected to the outer ceramic layer and ejects air outwards through the outer ceramic micro-holes provided in the outer ceramic layer; the air storage cavity ejects air toward the inner ceramic holes provided in the inner ceramic layer through the radial air holes; the aperture of the inner ceramic holes is larger than the aperture of the outer ceramic micro-holes.

[0012] Among them, it also includes a flow stabilizing component arranged on both sides of the equipment base, the flow stabilizing component includes a resonance cavity, the inner cavity of the resonance cavity is divided into a left resonance cavity and a right resonance cavity by a guide baffle, and the tops of the left resonance cavity and the right resonance cavity are rotatably installed with a left-rotating turbine and a right-rotating turbine; the air inlet of the resonance cavity is sleeved with a rubber bellows, the other end of the rubber bellows is connected to an air collecting ring, and the air collecting ring is sleeved on the outside of the outer ceramic layer and the outer ceramic micropores of the outer ceramic layer are connected to the air collecting ring.

[0013] A high-pressure air cavity is provided in the hollow optical shaft along the axial direction, and oblique micropores are evenly distributed on the tube wall of the hollow optical shaft.

[0014] Wherein, the inner cavity bottom surface of the resonance cavity is sealed and bonded with a porous sound-absorbing bottom plate.

[0015] The present invention has the following beneficial effects:

[0016] The present invention forms a spiral air film through the spiral air guide groove of the air floatation ring and the hollow optical axis, and cooperates with the continuous air supply of the air chamber through the radial air holes to achieve contactless suspension movement of the movable screen fixture, thereby largely eliminating the interference of mechanical friction on pressure detection.

[0017] Through the spherical adaptive deflection of the spherical base and the floating ball head, combined with the elastic deformation compensation of the lower disc spring and the upper disc spring of the bidirectional preload assembly, the pressure sensor can level the axis in real time under the overturning moment, achieving full-path isolation of the bending moment force and ensuring that the pressure sensor only captures the normal reaction force of the screen.

[0018] The large-aperture nozzles on the inner ceramic layer are used to maintain the stiffness of the bearing gas film, while the micro-aperture nozzles on the outer ceramic layer dynamically adjust the residual pressure in the gas storage chamber via the micro-aperture pressure relief holes. The pressure gradient self-balancing mechanism formed by the aperture difference between the inner and outer nozzles is used to eliminate the interference of air pressure fluctuations on the test system.

[0019] The present invention achieves counter-rotation of the left-hand turbine and the right-hand turbine in the left and right resonance cavities, and cooperates with the diversion of the airflow by the guide baffle and the interference attenuation of the sound waves by the porous sound-absorbing bottom plate to attenuate the pressure fluctuation of the airflow, thereby providing an acoustically silent environment for the air flotation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A side view of an embodiment of the present invention;

[0021] Figure 2 A partial half-section diagram of the second embodiment of the present invention;

[0022] Figure 3 This is a structural diagram of the floating ball head of the present invention;

[0023] Figure 4 Schematic diagram of the flow stabilizing component of the present invention.

[0024] The reference numerals in the figures are as follows:

[0025] 1. Equipment base; 2. Fixed screen fixture; 3. Movable screen fixture; 4. Optical axis; 5. Sliding wheel; 6. Drive motor; 31. Fixture body; 32. Clamping jaws; 41. Hollow optical axis; 42. Air-floating collar; 43. Inner ceramic layer; 44. Outer ceramic layer; 45. Air chamber; 71. Spherical base; 72. Floating ball head; 73. Aligning platform; 74. Pressure sensor; 741. Lower disc spring; 742. Upper disc spring ;75. Anti-loosening nut;411. High-pressure air chamber;412. Oblique micropores;421. Spiral air guide grooves;422. Radial air holes;423. Air storage chamber;424. Micro-diameter pressure relief holes;44. Outer ceramic layer;51. Resonance cavity;52. Guide baffle;521. Left resonance cavity;522. Right resonance cavity;531. Left-handed turbine;532. Right-handed turbine;54. Air collecting ring;542. Rubber bellows;512. Porous sound-absorbing bottom plate. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figures 1 to 4 , the invention provides a technical solution:

[0028] Example 1:

[0029] The rebound force testing device of this embodiment includes a device base 1, a fixed screen clamp 2, a movable screen clamp 3 and a pressure sensor 74. The fixed screen clamp 2 is fixed on the device base 1 and is used to fix the first end of the screen to be tested; the movable screen clamp 3 is slidably set on the device base 1 through a friction-reducing moving component and is used to clamp the second end of the screen to be tested; a driving motor 6 is installed at the rear end of the movable screen clamp 3 for driving it away from or close to the fixed screen clamp 2 in a straight line direction; the pressure sensor 74 is installed on the movable screen clamp 3 for real-time detection of the pressure value applied to the screen to be tested; the pressure sensor 74 is electrically connected to a display unit for real-time display of force value data.

[0030] The device base 1 serves as the basic bearing platform, and the fixed screen clamp 2 and the movable screen clamp 3 constitute a two-way clamping system for the screen. In order to reduce external influencing factors to determine the maximum force that the screen can withstand when it fails, it is necessary to reduce external friction and other factors to a minimum, and set a friction-reducing moving component. The friction-reducing moving component enables the movable screen clamp 3 to achieve precise linear displacement, and the drive motor 6 provides controllable traction power to form an axial tension / compression action source. The pressure sensor 74 is directly integrated with the movable screen clamp 3 to capture the reaction force during the deformation of the screen in real time, and to visualize the force value data through the display unit. This architecture ensures the isolation of external force interference during the test process and provides a pure mechanical environment for determining the screen failure threshold.

[0031] The anti-friction moving assembly includes an optical axis 4 horizontally mounted on the device base 1, and three sliding wheels 5 arranged in a V shape are mounted on the side wall of the movable screen clamp 3. The optical axis 4 is clamped between the three sliding wheels 5 so that the movable screen clamp 3 can move linearly along the optical axis 4.

[0032] The optical axis 4 is fixed horizontally on both sides of the device base 1 as a high-rigidity linear track, and the sliding wheels 5 are installed on the side walls of the movable screen fixture 3 in a V-shaped layout: two sliding wheels 5 are symmetrically angled above the optical axis 4, and the other sliding wheel 5 is vertically abutted against the lower edge of the optical axis 4. The three rolling wheels constitute the clamping system for the optical axis 4. The V-shaped angle provides radial constraint force balance and eliminates lateral swing; the linear contact between the optical axis 4 and the rolling wheels converts sliding friction into rolling friction. During the collaboration process, the thrust of the drive motor 6 is transmitted to the three-sliding wheel 5 assembly through the movable screen fixture 3, causing the sliding wheel 5 to roll purely along the axial direction of the optical axis 4. This allows the pressure sensor 74 to collect data to a large extent, eliminating mechanical friction interference and truly reflecting the mechanical properties of the screen material.

[0033] Example 2:

[0034] The friction-reducing moving component includes a hollow optical axis 41 and an air flotation ring 42; the air flotation ring 42 is sleeved on the outside of the hollow optical axis 41, and a spiral air guide groove 421 is provided on the inner wall of the air flotation ring 42. An air chamber 45 is provided inside the side wall of the movable screen clamp 3. The side wall of the movable screen clamp 3 is sealed and fixedly connected to the outer wall of the air flotation ring 42. One side of the air chamber 45 is connected to the external air compressor through a flexible air pipe, and the other side of the air chamber 45 is sealed and docked with the air flotation ring 42 through an interface. Radial air holes 422 are provided through the air flotation ring 42, and the radial air holes 422 connect the interface of the air chamber 45 and the spiral air guide groove 421.

[0035] This embodiment constructs a non-contact motion system. The hollow optical axis 41 serves as a static guide rail. The air float collar 42 converts the airflow from the external air compressor into a spiral air film surrounding the optical axis 41 through the spiral air guide groove 421, eliminating physical friction. The air chamber 45 on the side wall of the movable screen fixture 3 serves as an air pressure transfer hub. It is connected to the air compressor through a flexible air pipe, and then continuously supplies air to the spiral air guide groove 421 through the radial air holes 422, forming a closed-loop air float.

[0036] However, during the process of floating and pushing and squeezing, the movable screen clamp 3 may be slightly tilted, that is, the screen and the pressure sensor axis are offset to generate bending moment, resulting in a higher measured force value than the true value. Therefore, the movable screen clamp 3 includes a clamp body 31 and a clamping jaw 32. The clamping jaw 32 is rigidly locked to the front end surface of the clamp body 31. A spherical base 71 is welded to the center position of the rear end surface of the clamping jaw 32. The spherical base 71 is provided with a concave spherical surface. A floating ball head 72 is nested in the concave spherical surface of the spherical base 71. The top of the floating ball head 72 is cut into a horizontal mounting plane, and the horizontal mounting plane is welded with a centering platform 73. The pressure sensor 74 is installed on the centering platform 73 through a bidirectional pre-tightening assembly. The bidirectional pre-tightening assembly includes an anti-loosening bolt, a lower disc spring 741 and an upper disc spring 742. The lower disc spring 741 is close to the end face of the centering platform 73. The bottom surface of the pressure sensor 74 is crimped to the lower disc spring 741, and the upper disc spring 742 is close to the upper surface of the pressure sensor 74; the anti-loosening bolt passes through the lower disc spring 741, the pressure sensor 74 and the upper disc spring 742 in sequence from the centering platform 73 upward, and an anti-loosening nut 75 is screwed on the top of the anti-loosening bolt to form an elastic constraint on the pressure sensor 74.

[0037] It is worth mentioning that the overall structure of the floating ball head 72 is similar to a tumbler, with its center of gravity downward. Specifically, when the driving motor 6 pushes the movable screen clamp 3 to squeeze the screen, if the direction of the screen reaction force is offset from the axis of the pressure sensor 74, the generated overturning torque first acts on the clamping claw 32 and is transmitted to the floating ball head 72 through the spherical base 71 at the rear end of the clamping claw 32. The floating ball head 72 produces an adaptive micro-rotation within the concave spherical surface of the spherical base 71, and its ball center is instantly positioned to the center of the torque vector, so that the horizontal mounting plane at the top of the floating ball head 72 is automatically leveled; the centering platform 73 welded on the horizontal mounting plane deflects synchronously therewith, driving the pressure sensor 74 to realize real-time calibration of the axis; at the same time, the lower disc spring 741 and the upper disc spring 742 of the bidirectional preload assembly produce reverse elastic deformation: the lower disc spring 741 compresses and absorbs the tilt displacement of the centering platform 73, and the upper disc spring The spring 742 stretches to maintain the contact pressure on the upper surface of the pressure sensor 74, and the anti-loosening bolts penetrate each layer to constrain the deformation within the elastic range. The pre-tightening force of the anti-loosening nut 75 forces the two layers of disc springs to form a continuous bidirectional clamping effect, so that the pressure sensor 74 always maintains full contact with the centering platform 73 in three-dimensional floating without gap vibration; the spherical rotation freedom of the floating ball head 72 and the bidirectional elastic deformation of the disc spring group form a dynamic complement, just like a mechanical tumbler to correct the fixture posture in real time - when the overturning moment acts on the concave spherical surface of the spherical base 71, the instantaneous rotation of the floating ball head 72 converts the radial component of force into rolling friction dissipation, and the axial loading surface of the pressure sensor 74 is always perpendicular to the main vector of the screen reaction force under the elastic support of the lower disc spring 741 and the upper disc spring 742, completely isolating the bending moment conduction path, and ensuring that the data collected by the pressure sensor 74 is only the normal resistance of the screen.

[0038] The inner wall and outer wall of the air flotation ring 42 are respectively covered with an inner ceramic layer 43 and an outer ceramic layer 44. An air storage cavity 423 is provided inside the air flotation ring 42. The radial air holes 422 pass through the air storage cavity 423. The top of the air storage cavity 423 passes through a micro-diameter pressure relief hole 424. The micro-diameter pressure relief hole 424 is connected to the outer ceramic layer 44 and ejects air outwards through the outer ceramic micropores provided in the outer ceramic layer 44. The air storage cavity 423 ejects air from the inner ceramic layer 43 through the radial air holes 422. The inner ceramic hole ejects air, and the aperture of the inner ceramic hole is larger than the aperture of the outer ceramic micropore; when the external air compressor inputs high-pressure air flow to the air chamber 45, the air flow flows into the air storage cavity 423 of the air flotation ring 42 through the air chamber 45 interface, and the air storage cavity 423 evenly distributes the air flow to the inner ceramic holes of the inner ceramic layer 43 through the radial air holes 422. The large-aperture inner ceramic holes eject a diffused air film toward the surface of the hollow optical axis 41 to form a stable bearing air cushion; at the same time, the overpressure air inside the air storage cavity 423 The air is ejected from the micro-diameter pressure relief hole 424 at high speed and flows to the outer ceramic micropores of the outer ceramic layer 44. The outer micropores with small aperture compress the air flow into a fine laminar flow, forming an annular air curtain barrier on the outer wall of the air flotation ring 42; the large-aperture inner ceramic holes give priority to releasing the main pressure of the air storage cavity 423 to ensure the constant stiffness of the air film, and the micro-diameter pressure relief hole 424 dynamically adjusts the residual pressure of the air storage cavity 423 - when the air flow pressure suddenly increases, the micro-diameter pressure relief hole 424 produces a Venturi acceleration effect due to its extremely narrow aperture, passively Increase the discharge flow rate; when the pressure drops, the airflow resistance of the micro-diameter pressure relief hole 424 is automatically weakened, and the discharge flow rate is reduced synchronously; during this process, the inner ceramic hole maintains the air cushion support force, and the outer ceramic micropores continue to discharge redundant pressure. The difference in the aperture of the inner and outer nozzles forms a pressure gradient self-balancing, forcing the air pressure in the air storage chamber 423 to remain stable, completely eliminating the interference of air pressure fluctuations on the pressure sensor 74, and at the same time preventing excessive air pressure from escaping from both sides of the air flotation ring 42, causing an increase in airflow resistance;

[0039] The device also includes a flow stabilizing assembly arranged on both sides of the device base 1. The flow stabilizing assembly includes a resonance cavity 51. The inner cavity of the resonance cavity 51 is divided into a left resonance cavity 521 and a right resonance cavity 522 by a guide baffle 52. The bottom surface of the inner cavity of the resonance cavity 51 is sealed and bonded with a porous sound-absorbing bottom plate 512; the tops of the left resonance cavity 521 and the right resonance cavity 522 are both rotatably installed with a left-hand turbine 531 and a right-hand turbine 532; the air inlet of the resonance cavity 51 is covered with a rubber bellows 542. The other end of the rubber bellows 542 is connected to the gas collecting ring 54, which is sleeved on the outside of the outer ceramic layer 44 and the outer ceramic micropores of the outer ceramic layer 44 are connected to the gas collecting ring 54; the high-speed airflow ejected from the outer ceramic micropores of the air flotation ring 42 is first captured by the gas collecting ring 54, and the annular cavity of the gas collecting ring 54 converges the discrete airflow into an axial jet; when the jet is introduced into the resonance cavity 51 through the rubber bellows 542, the corrugated wall of the rubber bellows 542 absorbs the pulsating kinetic energy of the airflow , converting pressure oscillations into elastic deformation dissipation; the airflow entering the resonance cavity 51 is forced to be diverted by the guide baffle 52, part of the airflow enters the left resonance cavity 521 to drive the left-hand turbine 531 to rotate clockwise, and the remaining airflow enters the right resonance cavity 522 to drive the right-hand turbine 532 to rotate counterclockwise; the blades of the left-hand turbine 531 cut the airflow into micro-vortices, which collide and reflect multiple times on the inner wall of the left resonance cavity 521, and the kinetic energy is converted into heat energy; the synchronous reverse rotation of the right-hand turbine 532 generates a centrifugal force field in the right resonance cavity 522, causing the airflow to spiral downward along the guide baffle 52; when the downward airflow hits the porous sound-absorbing bottom plate 512, the sound wave undergoes a triple attenuation of transmission-reflection-interference in the porous structure; the different rotations of the left-hand turbine 531 and the right-hand turbine 532 force the two cavities on both sides to produce a pressure fluctuation phase difference, and the vibration energy cancels each other out at the cavity interface; this causes the pressure fluctuation of the outlet airflow to attenuate, providing an acoustically silent environment for the hollow optical axis 41 air flotation system.

[0040] A high-pressure air cavity 411 is axially provided inside the hollow optical axis 41, and oblique micropores 412 are evenly distributed on the tube wall of the hollow optical axis 41. Due to possible external vibrations, sudden stops or inertia, the movable screen clamp 3 is suddenly pressed downward toward the hollow optical axis 41. The originally uniform air cushion layer is instantly squeezed and thinned in this local area, and the airflow cannot be replenished in this suddenly narrowed gap. The gap between the surface of the hollow optical axis 41 and the bottom surface of the air flotation ring 42 almost becomes a vacuum state. The atmospheric pressure senses this low-pressure area, which will generate a certain suction force. The oblique micropores 412 closest to this downward pressure position sense the sudden drop in pressure, and the high-pressure gas in the hollow optical axis 41 responds immediately and is violently ejected through the oblique micropores 412. The oblique airflow forces its way into the tiny gap that is almost closed, and instantly fills the area that was originally intended to be a vacuum with high-pressure gas.

[0041] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A rebound force testing device, characterized in that: The invention comprises a device base (1), a fixed screen fixture (2), a movable screen fixture (3) and a pressure sensor (74), wherein the fixed screen fixture (2) is fixed on the device base (1) and is used to fix the first end of the screen to be tested; the movable screen fixture (3) is slidably arranged on the device base (1) through a friction-reducing movable component and is used to clamp the second end of the screen to be tested; a driving motor (6) is installed at the rear end of the movable screen fixture (3) for driving it to move away from or approach the fixed screen fixture (2) in a straight line direction; the pressure sensor (74) is installed on the movable screen fixture (3) and is used to detect the pressure value applied to the screen to be tested in real time; the pressure sensor (74) is electrically connected to a display unit for displaying force value data in real time.

2. The rebound force testing device according to claim 1, characterized in that: The anti-friction moving assembly comprises an optical axis (4) mounted horizontally on a device base (1); three sliding wheels (5) arranged in a V-shape are mounted on the side wall of the movable screen fixture (3); the optical axis (4) is clamped between the three sliding wheels (5) so that the movable screen fixture (3) moves linearly along the optical axis (4).

3. The rebound force testing device according to claim 1, characterized in that: The friction-reducing moving component includes a hollow optical axis (41) and an air-floating collar (42); the air-floating collar (42) is sleeved on the outside of the hollow optical axis (41); a spiral air guide groove (421) is provided on the inner wall of the air-floating collar (42); an air chamber (45) is provided inside the side wall of the movable screen fixture (3); the side wall of the movable screen fixture (3) is sealed and fixedly connected to the outer wall of the air-floating collar (42); one side of the air chamber (45) is connected to an external air compressor through a flexible air pipe; the other side of the air chamber (45) is sealed and docked with the air-floating collar (42) through an interface; radial air holes (422) are provided through the air-floating collar (42); the radial air holes (422) communicate the interface of the air chamber (45) and the spiral air guide groove (421).

4. The rebound force testing device according to claim 3, characterized in that: The movable screen clamp (3) comprises a clamp body (31) and a clamping claw (32), wherein the clamping claw (32) is rigidly locked to the front end face of the clamp body (31), a spherical base (71) is welded at the center position of the rear end face of the clamping claw (32), a concave spherical surface is provided on the spherical base (71), a floating ball head (72) is nested in the concave spherical surface of the spherical base (71), the top of the floating ball head (72) is cut into a horizontal mounting plane, and a centering platform (73) is welded to the horizontal mounting plane; the pressure sensor (74) is mounted on the centering platform (73) through a bidirectional pre-tightening assembly, and the bidirectional pre-tightening assembly is installed on the centering platform (73). The assembly comprises an anti-loosening bolt, a lower disc spring (741) and an upper disc spring (742); the lower disc spring (741) is in close contact with the end face of the centering platform (73); the bottom face of the pressure sensor (74) is pressed against the lower disc spring (741); and the upper disc spring (742) is in close contact with the upper surface of the pressure sensor (74); the anti-loosening bolt passes through the lower disc spring (741), the pressure sensor (74) and the upper disc spring (742) in sequence from the centering platform (73) upward; and a anti-loosening nut (75) is screwed on the top of the anti-loosening bolt to form an elastic constraint on the pressure sensor (74).

5. The rebound force testing device according to claim 4, characterized in that: The inner wall and outer wall of the air flotation collar (42) are respectively covered with an inner ceramic layer (43) and an outer ceramic layer (44); an air storage cavity (423) is provided inside the air flotation collar (42); the radial air holes (422) pass through the air storage cavity (423); a micro-diameter pressure relief hole (424) is passed through the top of the air storage cavity (423); the micro-diameter pressure relief hole (424) is connected to the outer ceramic layer (44) and ejects air outwards through the outer ceramic micro-holes provided in the outer ceramic layer (44); the air storage cavity (423) ejects air toward the inner ceramic holes provided in the inner ceramic layer (43) through the radial air holes (422); the aperture of the inner ceramic hole is larger than the aperture of the outer ceramic micro-hole.

6. The rebound force testing device according to claim 5, characterized in that: The device also includes a flow stabilizing component arranged on both sides of the device base (1), the flow stabilizing component including a resonance cavity (51), the inner cavity of the resonance cavity (51) being divided into a left resonance cavity (521) and a right resonance cavity (522) by a flow guide baffle (52), the tops of the left resonance cavity (521) and the right resonance cavity (522) being rotatably mounted with a left-hand turbine (531) and a right-hand turbine (532); the air inlet of the resonance cavity (51) is sheathed with a rubber bellows (542), the other end of the rubber bellows (542) being connected to an air collecting ring (54), the air collecting ring (54) being sheathed outside the outer ceramic layer (44), and the outer ceramic micropores of the outer ceramic layer (44) being connected to the air collecting ring (54).

7. The rebound force testing device according to claim 3, characterized in that: A high-pressure air cavity (411) is provided in the hollow optical axis (41) along the axial direction, and oblique micropores (412) are evenly distributed on the tube wall of the hollow optical axis (41).

8. The rebound force testing device according to claim 6, characterized in that: The inner cavity bottom surface of the resonance cavity (51) is sealed and bonded with a porous sound-absorbing bottom plate (512).

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