A device for simulating weightlessness based on nitrogen springs and air cushions

Abstract

The present invention discloses a device for simulating weightlessness environment based on nitrogen springs and air floating pads, comprising a base plate, a hinge fixing mechanism, a space hinge, a counterweight, an air floating support mechanism and an exciting device, wherein the hinge fixing mechanism, the air floating support mechanism and the exciting device are sequentially mounted on the base plate, one end of the space hinge is connected to the hinge fixing mechanism, the other end of the space hinge is connected to a side surface of the counterweight, the other side surface of the counterweight is connected to an exciting rod of the exciting device, the counterweight is arranged on the air floating support mechanism and air floating support is formed for the counterweight through the air floating support mechanism; the device is used for measuring dynamic stiffness, so the inherent characteristics of the rubber rope will affect the accuracy of the test result, while the present invention uses an air floating device to reduce the external influence on the dynamic stiffness of the hinge.

Description

Technical Field

[0001] The invention relates to the field of dynamic stiffness test of hinge mechanism of solar cell array, and more specifically, to a device for simulating weightlessness environment based on nitrogen spring and air floating pad. Background Art

[0002] Satellite solar arrays are generally composed of several substrates with solar cells attached. The substrates and the solar array and the satellite are connected by space hinges. Therefore, dynamic modeling and simulation analysis are required in the design of solar arrays, and accurate simulation of complex hinges is a major challenge. It has been proven that the stiffness of the hinge has a significant impact on dynamic modeling and simulation analysis. Therefore, it is necessary to use an exciter to excite the counterweight connected to the hinge in a simulated weightless environment to achieve resonance and obtain the dynamic stiffness and of the hinge. Currently, the suspension method and air flotation support method are widely used to simulate weightless or low-gravity environments. Although the suspension method can simulate a weightless environment, the rubber rope used for suspension will have a certain degree of influence on the dynamic stiffness test of the space hinge due to its inherent characteristics; since the test needs to measure the dynamic stiffness of the hinge, when using the current air flotation device, the center of gravity of the counterweight object may shift when the exciter is used for the test, which will cause changes in the simulated weightless environment. At the same time, due to the force between the hinges acting on the counterweight block, the air flotation cushion needs to provide more than just gravity. The current air flotation device cannot adjust the air flotation height to eliminate the force between the hinges. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the above-mentioned air flotation device cannot adapt to the changes in the simulated weightless environment caused by the shift of the center of gravity of the object and cannot adjust the height, resulting in ignoring the force between the hinges. A simulated weightless environment device based on a nitrogen spring and an air flotation pad is proposed, which effectively avoids the influence of the force between the hinges on the dynamic stiffness test, and can still keep the air flotation platform level when the center of gravity of the counterweight block shifts when it is excited by the exciter.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions: a device for simulating weightlessness environment based on nitrogen springs and air floating cushions, comprising a base plate, a hinge fixing mechanism, a space hinge, a counterweight, an air floating support mechanism and an exciting device, wherein the hinge fixing mechanism, the air floating support mechanism and the exciting device are sequentially mounted on the base plate, one end of the space hinge is connected to the hinge fixing mechanism, the other end of the space hinge is connected to one side of the counterweight, the other side of the counterweight is connected to the exciting rod of the exciting device, the counterweight is arranged on the air floating support mechanism and air floating support is formed on the counterweight through the air floating support mechanism;

[0005] The hinge fixing mechanism comprises a hinge mounting seat support block, a hinge mounting seat and a hinge mounting flange, the bottom of the hinge mounting seat support block is fixed to the bottom plate, the hinge mounting seat is fixed to the hinge mounting seat support block, the hinge mounting flange is fixed to a side surface of the hinge mounting seat, one end of the space hinge to be measured is fixed to the hinge mounting seat through the hinge mounting flange; the other end of the space hinge to be measured is fixedly connected to a vertical side surface of the counterweight block through a lightweight rigid rod;

[0006] The excitation device comprises an exciter mounting seat, an exciter mounting seat support block, an exciter and an excitation rod, the excitation rod is horizontally mounted at the output end of the exciter, the exciter is fixed on the exciter mounting seat, the exciter mounting seat is fixed on the exciter mounting seat support block, and the bottom of the exciter mounting seat support block is fixed on the bottom plate;

[0007] The air floating support mechanism includes a nitrogen spring mounting seat, an air floating platform, a weighing sensor, a weighing sensor base, a universal joint, a lifting plate, a limiting rod, an air floating cushion, an air floating cushion base and four nitrogen springs. The nitrogen spring mounting seat is fixed on the bottom plate, the bottoms of the four nitrogen springs are fixed on the nitrogen spring mounting seat and the four nitrogen springs are evenly arranged on the nitrogen spring mounting seat, the upper ends of the four nitrogen springs are connected to the lifting plate through universal joints, the weighing sensor base is fixed above the lifting plate, the weighing sensor is fixed above the weighing sensor base, the air floating platform is fixed above the weighing sensor, at least three air floating cushions are provided, each of which is installed on the air floating platform through the air floating cushion base, and the counterweight is provided above the air floating cushion. When the air floating cushion is working, the surface of the air floating cushion and the bottom of the counterweight form air floating so that the counterweight is suspended above the air floating cushion; the limiting rod is arranged around the edge of the entire counterweight, and at least four limiting rods are provided and the bottom of the limiting rod is fixed on the nitrogen spring mounting seat.

[0008] Furthermore, the bottom plate is provided with evenly distributed positioning grooves, and the bottoms of the nitrogen spring mounting seat, hinge mounting seat support block and exciter mounting seat support block are all provided with positioning blocks, and the nitrogen spring mounting seat, hinge mounting seat support block and exciter mounting seat are installed through the cooperation of the positioning blocks and the positioning grooves on the bottom plate. Thus, the nitrogen spring mounting seat, hinge mounting seat support block and exciter mounting seat can be accurately installed on the bottom plate, which improves the positioning accuracy of the entire device and facilitates the replacement of new space hinges.

[0009] Furthermore, four universal joint bases are arranged at the bottom of the lifting plate, and the heads of four nitrogen springs are connected to the four universal joint bases at the bottom of the lifting plate through universal joints. The nitrogen springs act to provide a constant force, and when the center of gravity of the counterweight block shifts due to the exciting movement, causing the air floating platform to tilt, the piston rod of the nitrogen spring extends or contracts and, through the action of the universal joint, keeps the air floating platform level.

[0010] Furthermore, the connections between the two ends of the lightweight rigid rod and the counterweight block and the space hinge are both rigid connections.

[0011] Furthermore, the bottom of the weighing sensor, the weighing sensor base, and the lifting plate are all provided with positioning holes, and the bottom of the weighing sensor, the weighing sensor base, and the lifting plate are connected by threads. The upper end of the weighing sensor is positioned with the air floating platform through the positioning holes. The weighing sensor measures the gravity of the counterweight, the gravity of the air floating platform and the air floating cushion device on the air floating platform, and the force between the measured space hinge and the light rigid rod. In order to ensure the accuracy of the measured dynamic stiffness and simulate the weightless environment, it is necessary to make the measured value of the weighing sensor just equal to the gravity of the counterweight, the gravity of the air floating platform and the air floating cushion device on the air floating platform, that is, the force between the measured space hinge and the light rigid rod is zero, and the height of the air floating cushion can be adjusted by the height adjustment mechanism of the air floating cushion device so that the measured value reaches the ideal value.

[0012] Furthermore, the air-floating cushion base is also provided with a lifting adjustment bolt, a lower inclined iron of a height adjustment mechanism, and an upper inclined iron of a height adjustment mechanism. The air-floating cushion base, the lower inclined iron of the height adjustment mechanism, and the upper inclined iron of the height adjustment mechanism form a height adjustment mechanism; the air-floating cushion is fixed on the upper inclined iron of the height adjustment mechanism, the lower inclined iron of the height adjustment mechanism is fixed on the air-floating cushion base, the lower inclined iron of the height adjustment mechanism is cylindrical, and a cylindrical hole matching the lower inclined iron of the height adjustment mechanism is provided in the middle of the upper inclined iron of the height adjustment mechanism, the upper inclined iron of the height adjustment mechanism is sleeved on the lower inclined iron of the height adjustment mechanism, and a threaded through hole is provided on the air-floating cushion base, and the lifting adjustment bolt passes through the threaded through hole and is pressed on the bottom surface of the upper inclined iron of the height adjustment mechanism. A height adjustment mechanism is equipped with two bolts, and there are two threaded through holes on both sides of the circumference of the air-floating cushion base. The lower inclined iron of the height adjustment mechanism is moved by the action of the thread, driving the upper inclined iron of the height adjustment mechanism to move up and down to achieve the effect of adjusting the height of the air-floating cushion.

[0013] Furthermore, there are four air-floating cushion bases, which are connected to the air-floating platform through threads. A certain amount of gas is introduced to form an air film between the air-floating cushion and the bottom surface of the counterweight, which reduces friction to improve the accuracy of the dynamic stiffness test results and simulates a weightless environment.

[0014] Furthermore, the four air floating cushions are respectively connected to an external air supply device through a pressure regulating valve provided with an air pipe.

[0015] The beneficial effects of the present invention are:

[0016] 1. The traditional suspension type simulates the weightless environment and uses rubber ropes to hang the counterweight. Since this device is used to measure the dynamic stiffness, the inherent characteristics of the rubber ropes will affect the accuracy of the test results. The present invention uses an air flotation device to reduce the external influence on the dynamic stiffness of the hinge.

[0017] 2. The present invention has a universal joint structure. When the center of gravity of the counterweight is shifted by the vibration exciter, the nitrogen spring piston rod at the bottom that provides constant force will be retracted or extended, resulting in uneven force and thus causing the air-floating platform to tilt. The universal joint can keep the air-floating platform level in this case. A limit rod is installed at the base of the air-floating support mechanism to prevent the counterweight from falling off the air-floating platform when the center of gravity shifts.

[0018] 3. The four air-floating cushion devices on the same platform are connected to the external air supply device through pressure-regulating valves with air pipes, which not only ensures the balance of supporting force, but also effectively avoids mutual interference between the air-floating cushion devices. The weighing sensor can also measure the disturbance of the air pipe to improve the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The diagram is a schematic diagram of the overall structure of a device for simulating a weightlessness environment based on a nitrogen spring and an air floating cushion according to the present invention.

[0020] Figure 2 It is a front view of the air floating support mechanism of the present invention.

[0021] Figure 3 It is a schematic diagram of the overall structure of the height adjustment mechanism of the air floating support mechanism of the present invention.

[0022] Figure 4 It is a half-section view of the height adjustment mechanism of the air floating support mechanism of the present invention.

[0023] In the figure, 1-base plate, 2-hinge mounting seat support block, 3-hinge mounting seat, 4-hinge mounting flange, 5-space hinge, 6-lightweight rigid rod, 7-counterweight block, 8-excitation rod mounting flange, 9-excitation rod, 10-exciter, 11-exciter mounting seat, 12-exciter mounting seat support block, 13-limiting rod, 14-air floating platform, 15-weighing sensor, 16-weighing sensor base, 17-lifting plate, 18-nitrogen spring, 19-nitrogen spring mounting seat, 20-air floating cushion, 21-air floating cushion base, 22-upper inclined iron of height adjustment mechanism, 23-lower inclined iron of height adjustment mechanism. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] like Figures 1 to 4As shown, a device for simulating weightlessness environment based on a nitrogen spring and an air floating cushion comprises a base plate 1, a hinge fixing mechanism, a space hinge 5, a counterweight 7, an air floating support mechanism and an exciting device, wherein the hinge fixing mechanism, the air floating support mechanism and the exciting device are sequentially mounted on the base plate 1, one end of the space hinge 5 is connected to the hinge fixing mechanism, the other end of the space hinge 5 is connected to one side surface of the counterweight 7, the other side surface of the counterweight 7 is connected to an exciting rod 9 of the exciting device, the counterweight 7 is arranged on the air floating support mechanism, a layer of air film is formed between the surface of the air floating cushion 20 and the counterweight 7 to offset the gravity of the counterweight, and air floating support is formed for the counterweight 7 through the air floating support mechanism.

[0026] The hinge fixing mechanism includes a hinge mounting seat support block 2, a hinge mounting seat 3 and a hinge mounting flange 4, the bottom of the hinge mounting seat support block 2 is fixed on the base plate 1, the hinge mounting seat 3 is fixed on the hinge mounting seat support block 2, the hinge mounting flange 4 is fixed on a side surface of the hinge mounting seat 3, one end of the measured space hinge 5 is fixed to the hinge mounting seat 3 through the hinge mounting flange 4; the other end of the measured space hinge 5 is fixedly connected to a vertical side surface of the counterweight block 7 through a lightweight rigid rod 6.

[0027] The excitation device includes an exciter mounting seat 11, an exciter mounting seat support block 12, an exciter 10 and an excitation rod 9. The excitation rod 9 is horizontally mounted at the output end of the exciter 10, and the other end of the excitation rod 9 is connected to the counterweight block through the excitation rod mounting flange 8. The exciter 10 is fixed to the exciter mounting seat 11, the exciter mounting seat 11 is fixed to the exciter mounting seat support block 12, and the bottom of the exciter mounting seat support block 12 is fixed to the base plate 1.

[0028] The air floating support mechanism includes a nitrogen spring mounting seat 19, an air floating platform 14, a weighing sensor 15, a weighing sensor base 16, a universal joint, a lifting plate 17, a limit rod 13, an air floating cushion 20, an air floating cushion base 21 and four nitrogen springs 18. The nitrogen spring mounting seat 19 is fixed on the bottom plate 1, the bottoms of the four nitrogen springs 18 are fixed on the nitrogen spring mounting seat 19 and the four nitrogen springs 18 are evenly arranged on the nitrogen spring mounting seat 19, the upper ends of the four nitrogen springs 18 are connected to the lifting plate 17 through a universal joint, the weighing sensor base 16 is fixed above the lifting plate 17, and the weighing sensor base 16 is fixed on the lifting plate 17. The weight sensor 15 is fixed above the weighing sensor base 16, and the air floating platform 14 is fixed above the weighing sensor 15. At least three air floating cushions 20 are provided, and each air floating cushion 20 is installed on the air floating platform 14 through the air floating cushion base 21. The counterweight block 7 is arranged above the air floating cushion 20. When the air floating cushion 20 is working, the surface of the air floating cushion 20 and the bottom of the counterweight block 7 form air flotation so that the counterweight block 7 is suspended above the air floating cushion 20; the limit rod 13 is arranged around the edge of the entire counterweight block 7, and at least four limit rods 13 are provided and the bottom of the limit rod 13 is fixed on the nitrogen spring mounting seat 19.

[0029] The nitrogen spring 18 provides a constant force. When the center of gravity of the counterweight 7 is shifted due to the exciting movement, causing the air-floating platform 14 to tilt, the piston rod of the nitrogen spring 18 extends or contracts and the air-floating platform 14 remains horizontal through the action of the universal joint.

[0030] The weighing sensor 15 measures the gravity of the counterweight 7, the gravity of the air-floating platform 14 and the air-floating cushion device on the air-floating platform, and the force between the measured space hinge 5 and the light rigid rod 6. In order to ensure the accuracy of the measured dynamic stiffness and simulate the weightless environment, it is necessary to make the measured value of the weighing sensor 15 just equal to the gravity of the counterweight 7, the gravity of the air-floating platform 14 and the air-floating cushion device on the air-floating platform, that is, the force between the measured space hinge 5 and the light rigid rod 6 is zero. The height of the air-floating cushion 20 can be adjusted through the height adjustment mechanism of the air-floating cushion device to make the measured value reach the ideal value.

[0031] The base plate 1 is provided with evenly distributed positioning grooves, and the bottoms of the nitrogen spring mounting seat 19, the hinge mounting seat support block 2 and the exciter mounting seat support block 12 are all provided with positioning blocks. The nitrogen spring mounting seat 19, the hinge mounting seat support block 2 and the exciter mounting seat 11 are installed by the cooperation of the positioning blocks with the positioning grooves on the base plate 1.

[0032] Four universal joint bases are arranged at the bottom of the lifting plate 17 , and the heads of the four nitrogen springs 18 are connected to the four universal joint bases at the bottom of the lifting plate 17 through universal joints.

[0033] The two ends of the lightweight rigid rod 6 are rigidly connected to the counterweight 7 and the space hinge 5 .

[0034] Positioning holes are provided on the bottom of the weighing sensor 15 , the weighing sensor base 16 , and the lifting plate 17 . The bottom of the weighing sensor 15 , the weighing sensor base 16 , and the lifting plate 17 are connected by threads.

[0035] The air floating cushion base 21 is also provided with a lifting adjustment bolt, a lower inclined iron 23 of a height adjustment mechanism and an upper inclined iron 22 of a height adjustment mechanism. The air floating cushion base 21, the lower inclined iron 23 of the height adjustment mechanism and the upper inclined iron 22 of the height adjustment mechanism constitute a height adjustment mechanism; the air floating cushion 20 is fixed on the upper inclined iron 22 of the height adjustment mechanism, the lower inclined iron 23 of the height adjustment mechanism is fixed on the air floating cushion base 21, the lower inclined iron 23 of the height adjustment mechanism is cylindrical, and a cylindrical hole matching the lower inclined iron 23 of the height adjustment mechanism is provided in the middle of the upper inclined iron 22 of the height adjustment mechanism, the upper inclined iron 22 of the height adjustment mechanism is sleeved on the lower inclined iron 23 of the height adjustment mechanism, and a threaded through hole is provided on the air floating cushion base 21, and the lifting adjustment bolt passes through the threaded through hole and is pressed on the bottom surface of the upper inclined iron 22 of the height adjustment mechanism

[0036] There are four air flotation cushion bases 21, which are connected to the air flotation platform 14 through threads. The four air flotation cushions 20 are connected to an external air supply device through pressure regulating valves provided with air pipes.

[0037] The specific workflow of the present invention is as follows:

[0038] During installation, first fix the base 1 on a horizontal plane, then install the hinge mounting seat support block 2, the air floating support mechanism and the exciter mounting seat 11 on the bottom plate 1, ensure that their centers are in the same straight line, place the counterweight block 7 on four air floating cushions 20, so that the center of gravity of the counterweight block 7 falls on the center of the air floating support mechanism, and then install the lightweight rigid rod 6, the space hinge 5 to be tested, the hinge mounting flange 4, the hinge mounting seat 3, the excitation rod mounting flange 8, the excitation rod 9, the exciter 10, and the exciter mounting seat 11 as required. At this time, since the height of the air floating cushion 20 is not adjusted, there is an interaction force between the space hinge 5 and the lightweight rigid rod 6, which will act on the counterweight block 7, so that the value measured by the weighing sensor 15 is different from the ideal value. At this time, adjust the height adjustment mechanism so that the measured value of the weighing sensor 15 is the same as the theoretical value, that is, the height adjustment is completed, and then the dynamic stiffness test of the space hinge 5 is carried out through the exciter 10.

[0039] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A device for simulating weightlessness environment based on nitrogen springs and air floating cushions, characterized in that: The invention comprises a base plate (1), a hinge fixing mechanism, a space hinge (5), a counterweight (7), an air-floating support mechanism and an exciting device, wherein the hinge fixing mechanism, the air-floating support mechanism and the exciting device are sequentially mounted on the base plate (1), one end of the space hinge (5) is connected to the hinge fixing mechanism, the other end of the space hinge (5) is connected to a side surface of the counterweight (7), the other side surface of the counterweight (7) is connected to an exciting rod (9) of the exciting device, and the counterweight (7) is arranged on the air-floating support mechanism and air-floating support is formed on the counterweight (7) through the air-floating support mechanism; The hinge fixing mechanism comprises a hinge mounting seat support block (2), a hinge mounting seat (3) and a hinge mounting flange (4); the bottom of the hinge mounting seat support block (2) is fixed on the bottom plate (1); the hinge mounting seat (3) is fixed on the hinge mounting seat support block (2); the hinge mounting flange (4) is fixed on a side surface of the hinge mounting seat (3); one end of the space hinge (5) to be measured is fixed to the hinge mounting seat (3) via the hinge mounting flange (4); the other end of the space hinge (5) to be measured is fixedly connected to a vertical side surface of the counterweight block (7) via a lightweight rigid rod (6); The excitation device comprises an exciter mounting seat (11), an exciter mounting seat support block (12), an exciter (10) and an excitation rod (9), wherein the excitation rod (9) is horizontally mounted at the output end of the exciter (10), the exciter (10) is fixed on the exciter mounting seat (11), the exciter mounting seat (11) is fixed on the exciter mounting seat support block (12), and the bottom of the exciter mounting seat support block (12) is fixed on the bottom plate (1); The air floating support mechanism comprises a nitrogen spring mounting seat (19), an air floating platform (14), a weighing sensor (15), a weighing sensor base (16), a universal joint, a lifting plate (17), a limit rod (13), an air floating cushion (20), an air floating cushion base (21) and four nitrogen springs (18); the nitrogen spring mounting seat (19) is fixed on the bottom plate (1); the bottoms of the four nitrogen springs (18) are fixed on the nitrogen spring mounting seat (19) and the four nitrogen springs (18) are evenly arranged on the nitrogen spring mounting seat (19); the upper ends of the four nitrogen springs (18) are connected to the lifting plate (17) via a universal joint; the weighing sensor base (16) is fixed above the lifting plate (17); The sensor (15) is fixed above the weighing sensor base (16), the air floating platform (14) is fixed above the weighing sensor (15), at least three air floating pads (20) are provided, each air floating pad (20) is installed on the air floating platform (14) through the air floating pad base (21), the counterweight (7) is arranged above the air floating pad (20), and when the air floating pad (20) is working, the surface of the air floating pad (20) and the bottom of the counterweight (7) form air floating so that the counterweight (7) is suspended above the air floating pad (20); the limit rod (13) is arranged around the edge of the entire counterweight (7), at least four limit rods (13) are provided, and the bottom of the limit rod (13) is fixed on the nitrogen spring mounting seat (19).

2. The device for simulating weightlessness environment based on nitrogen spring and air floating cushion according to claim 1, characterized in that: The base plate (1) is provided with evenly distributed positioning grooves, and the bottoms of the nitrogen spring mounting seat (19), the hinge mounting seat support block (2) and the exciter mounting seat support block (12) are all provided with positioning blocks, and the nitrogen spring mounting seat (19), the hinge mounting seat support block (2) and the exciter mounting seat (11) are installed by the cooperation of the positioning blocks with the positioning grooves on the base plate (1).

3. The device for simulating weightlessness environment based on nitrogen spring and air floating cushion according to claim 2, characterized in that: Four universal joint bases are arranged at the bottom of the lifting plate (17), and the heads of the four nitrogen springs (18) are connected to the four universal joint bases at the bottom of the lifting plate (17) via universal joints.

4. The device for simulating weightlessness environment based on nitrogen spring and air floating cushion according to claim 3, characterized in that: The connections between the two ends of the lightweight rigid rod (6) and the counterweight block (7) and the space hinge (5) are all rigid connections.

5. The device for simulating weightlessness environment based on nitrogen spring and air floating cushion according to claim 4, characterized in that: Positioning holes are provided on the bottom of the weighing sensor (15), the weighing sensor base (16), and the lifting plate (17), and the bottom of the weighing sensor (15), the weighing sensor base (16), and the lifting plate (17) are connected via threads.

6. The device for simulating weightlessness environment based on nitrogen spring and air floating cushion according to claim 5, characterized in that: The air-floating cushion base (21) is also provided with a lifting adjustment bolt, a lower inclined iron (23) of a height adjustment mechanism, and an upper inclined iron (22) of the height adjustment mechanism. The air-floating cushion base (21), the lower inclined iron (23) of the height adjustment mechanism, and the upper inclined iron (22) of the height adjustment mechanism constitute a height adjustment mechanism. The air-floating cushion (20) is fixed on the upper inclined iron (22) of the height adjustment mechanism, and the lower inclined iron (23) of the height adjustment mechanism is fixed on the air-floating cushion base (21). The lower inclined iron (23) of the height adjustment mechanism is cylindrical. A cylindrical hole matching the lower inclined iron (23) of the height adjustment mechanism is provided in the middle of the upper inclined iron (22) of the height adjustment mechanism. The upper inclined iron (22) of the height adjustment mechanism is sleeved on the lower inclined iron (23) of the height adjustment mechanism. A threaded through hole is provided on the air-floating cushion base (21). The lifting adjustment bolt passes through the threaded through hole and is pressed against the bottom surface of the upper inclined iron (22) of the height adjustment mechanism.

7. The device for simulating weightlessness environment based on nitrogen spring and air floating cushion according to claim 6, characterized in that: There are four air flotation cushion bases (21) in total, and the air flotation cushion bases (21) are connected to the air flotation platform (14) via threads.

8. The device for simulating weightlessness environment based on nitrogen spring and air floating cushion according to claim 7, characterized in that: The four air floating cushions (20) are respectively connected to an external air supply device via a pressure regulating valve provided with an air pipe.

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