A microgravity simulation device combining ball bearings and counterweights

Abstract

The present invention relates to a microgravity simulation device combining a ball bearing and a counterweight. The device comprises a linear bearing assembly and a hoisting assembly fixedly mounted on a platform frame, wherein the linear bearing assembly is used to restrict the vertical movement of the hoisting assembly. The platform frame is equipped with an air foot at the bottom, enabling free movement within a smooth plane. The counterweight assembly is fixedly mounted on the hoisting assembly. The counterweight assembly is used to offset the weight of a target load, allowing the target load to move freely in the vertical direction. The target load is fixedly connected to the hoisting assembly via the ball bearing assembly. The ball bearing assembly is used to restrict the target load from rotating around its center. The present invention simply and effectively simulates terrestrial microgravity for space loads, providing convenient conditions for conducting terrestrial simulation experiments of space contact operations.

Description

Technical Field

[0001] The present invention belongs to the technical field of microgravity simulation, in particular to a microgravity simulation device combining a ball bearing with a reverse counterweight. Background Art

[0002] Space payloads typically experience microgravity in space, while conditions on Earth, often affected by gravity, are often not equivalent. This environmental difference not only affects the dynamics of the space payload itself, but also its dynamics during collisions and interactions with other equipment. Space payloads are also extremely expensive to develop and launch, so thorough experimental verification and testing are essential before they are launched into space. Simulating the microgravity conditions of space payloads on Earth is a key issue that urgently needs to be researched and addressed.

[0003] Commonly used microgravity equivalent methods include: water flotation, suspension, parabolic flight, and air flotation. Each of these methods has the following problems:

[0004] 1) Water float method: The disadvantages are that water resistance and turbulence will affect the dynamic characteristics of the test equipment and the accuracy of space environment simulation. The test equipment must be specially waterproofed, the maintenance cost is high, and the sealing requirements during the test are high.

[0005] 2) Suspension method: The disadvantages are that the microgravity simulation accuracy is not high, the truss structure supporting the rope is complex and occupies a large space, the friction force on the rope during movement is large, which seriously affects the test accuracy, and the active suspension method is prone to interference. In addition, factors such as the flexibility and jitter of the rope and the inertial effect of the counterweight block will have an adverse effect on the microgravity simulation.

[0006] 3) Parabolic flight method: The disadvantages are that it is expensive, the size and weight of the test equipment are limited, the safety of the flight needs to be considered, and the microgravity simulation time is short.

[0007] 4) Flotation method: Disadvantages: Existing equipment can only achieve microgravity simulation with three degrees of freedom within a plane. The use of air bearings is expensive, the installation is cumbersome, and the equipment maintenance is expensive and complicated. Summary of the Invention

[0008] The technical problem solved by the present invention is: to overcome the shortcomings of the existing technology and provide a microgravity simulation device that combines a ball bearing with a reverse counterweight, so as to achieve the true freedom of space loads in six directions on the ground and provide a hardware foundation for conducting ground experiments.

[0009] The technical solution of the present invention is:

[0010] A microgravity simulation device combining a ball bearing and a counterweight, comprising: a platform frame, a linear bearing assembly, an air foot, a ball bearing assembly, a hoisting assembly, and a counterweight assembly;

[0011] The linear bearing assembly and the lifting assembly are fixedly mounted on the platform frame, and the linear bearing assembly is used to limit the vertical movement of the lifting assembly;

[0012] The bottom of the platform frame is equipped with a gas foot, which enables free movement on a smooth surface;

[0013] The counterweight assembly is fixedly mounted on the hoisting assembly; the counterweight assembly is used to offset the weight of the target load so that the target load can move freely in the vertical direction;

[0014] The target load is fixedly connected to the lifting assembly through a ball bearing assembly; the ball bearing assembly is used to limit the target load from rotating around the center.

[0015] Optionally, the platform frame includes: aluminum profiles, angle brackets, counterweight rods, counterweight blocks and a base plate;

[0016] A plurality of aluminum profiles are fixedly connected by angle brackets to form a frame structure; a bottom plate is fixedly installed at the bottom of the frame structure;

[0017] The counterweight rod is fixedly installed on the bottom plate, and the counterweight block is fixedly installed on the counterweight rod.

[0018] Optionally, two sets of linear bearing assemblies are symmetrically arranged up and down to form a set of linear bearing units; three sets of linear bearing units are arranged on the platform frame, and the lifting assembly of the linear bearing unit located in the middle is slidably connected to fix the target load, and the lifting assembly of the linear bearing units located on both sides is slidably connected to fix the reverse counterweight assembly.

[0019] Optionally, the linear bearing assembly includes: a bearing body, a bearing straight sleeve, a bearing ball sleeve, a cylinder, a mounting plate, a fastening nut, a first retaining ring, a bearing seat and a bearing support;

[0020] The bearing body, bearing straight sleeve, bearing ball sleeve and bearing support are assembled in sequence from inside to outside;

[0021] The bearing support is fixedly mounted on one end of the cylinder through the bearing seat and standard parts; the other end of the cylinder is fixedly mounted on the mounting plate, and the mounting plate is fixedly mounted on the frame structure;

[0022] The fastening nut and the first retaining ring are sleeved on the bearing straight sleeve, and the fastening nut and the first retaining ring are used in conjunction with each other to fix the axial position of the bearing ball sleeve.

[0023] Optionally, it further comprises: an intermediate straight rod;

[0024] Two sets of lifting components are symmetrically fixed on the frame structure; the two sets of lifting components are connected to the middle straight rod;

[0025] The target load is fixedly connected to the lifting assembly through the middle straight rod.

[0026] Optionally, each set of lifting components includes: n fixed pulleys, n pulley brackets, a Kevlar rope and a counterweight straight rod;

[0027] n fixed pulleys are fixedly mounted on the frame structure through pulley brackets;

[0028] One end of the Kevlar rope is passed around the fixed pulley and connected to the counterweight straight rod, and the other end of the Kevlar rope is passed around the fixed pulley and connected to the middle straight rod;

[0029] The two ends of the counterweight rod are respectively inserted into the bearing bodies of the two sets of linear bearing assemblies arranged symmetrically up and down, and the counterweight rod can slide up and down along the axis of the bearing body;

[0030] The n fixed pulleys in the same lifting assembly have the same height, while the fixed pulleys in different lifting assemblies have different heights; and the axes of the Kevlar ropes connected to the middle straight rod coincide with each other.

[0031] Optionally, the reverse counterweight assembly comprises: a clamping block and a second counterweight block;

[0032] The second counterweight block is fixedly mounted on the counterweight straight rod through a clamping block.

[0033] Optionally, the weight of the second counterweight is equal to half of the target load weight.

[0034] Optionally, the ball bearing assembly includes: upper and lower clamping blocks, a connecting flange, a ball bearing, an upper fastening nut, a linear bearing, a bearing seat, a connecting rod, a second retaining ring and a lower fastening nut;

[0035] The linear bearing, ball bearing, bearing seat and connecting rod are assembled in sequence from the inside to the outside, and the linear bearing is fixed on the middle straight rod through the upper and lower clamping blocks;

[0036] The upper fastening nut and the lower fastening nut are used together to fix the axial position of the ball bearing;

[0037] A second retaining ring is provided between the lower fastening nut and the ball bearing, and the second retaining ring is used to reduce friction;

[0038] The free end of the connecting rod is fixedly connected to the inner wall of the target load through a connecting flange;

[0039] The bearing seat can rotate around the center relative to the ball bearing, and the bearing seat and the ball bearing are spherically matched.

[0040] Optionally, it further comprises: a counterweight adjustment rod and a nut;

[0041] The counterweight adjusting rod is fixedly mounted on the bulkhead of the target load, and the nut and the counterweight adjusting rod are connected through a threaded pair.

[0042] The advantages of the present invention compared with the prior art are:

[0043] 1) Based on the existing flotation method, the present invention adopts a method combining ball bearings with reverse counterweights to overcome the defect of the existing flotation method that cannot realize microgravity simulation in the vertical direction and three rotational directions, and truly realizes microgravity simulation of space payloads in six degrees of freedom.

[0044] 2) On the one hand, the present invention cleverly designs a symmetrical distribution of counterweights, and on the other hand, adopts a staggered height to ensure that the Kevlar ropes are located on the same axis, thereby minimizing the problems of mutual competition caused by non-parallel linear slides, different bearing concentricity, and rope tension offset, thereby ensuring the smoothness of the entire device.

[0045] 3) The present invention designs a counterweight adjustment rod in the target load assembly. By adjusting the height of the nut on the counterweight adjustment rod, the target load posture can be fine-tuned to ensure that the center of mass of the entire mechanism coincides with the center of the ball bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a structural diagram of a microgravity simulation device combining a ball bearing and a counterweight according to the present invention;

[0047] Figure 2 This is a structural diagram of the platform framework of the present invention;

[0048] Figure 3 This is a structural diagram of the linear bearing assembly of the present invention;

[0049] Figure 4 This is a structural diagram of the bearing ball sleeve of the present invention;

[0050] Figure 5 This is a structural diagram of the reverse counterweight assembly and the hoisting assembly of the present invention;

[0051] Figure 6 This is a schematic diagram of the structure of the counterweight straight rod and the intermediate straight rod of the present invention;

[0052] Figure 7 This is a schematic diagram of the target payload assembly of the present invention;

[0053] Figure 8 This is a structural diagram of a ball bearing according to the present invention. DETAILED DESCRIPTION

[0054] The present invention provides a microgravity simulation device combining a ball bearing with a counterweight, such as Figure 1As shown, it can be divided into five major parts: platform frame, linear bearing assembly, ball bearing assembly 36, hoisting assembly and reverse counterweight assembly. The linear bearing assembly and hoisting assembly are fixedly mounted on the platform frame. The linear bearing assembly is used to limit the vertical movement of the hoisting assembly. The bottom of the platform frame is equipped with an air foot 5, which can move freely within a smooth plane. The reverse counterweight assembly is fixedly mounted on the hoisting assembly. The reverse counterweight assembly is used to offset the weight of the target load, allowing the target load to move freely in the vertical direction. That is, the reverse counterweight is used to put the target load in a zero-gravity state, achieving the purpose of simulating the state of space motion. Without considering the error caused by the imbalance of the counterweight, the target load is in a weightless state. Externally applied vertical main force or interference force will cause the target load to accelerate. The target load is fixedly connected to the hoisting assembly through the ball bearing assembly. The ball bearing assembly is used to limit the target load from rotating around the center. The outer diameter of the ball bearing is spherical and is installed together with a bearing seat with a spherical inner hole. The ball bearing and the bearing seat can achieve mutual rotation within a certain range using steel balls. The bearing seat is fixed and the target load is connected to the ball bearing. Without considering the influence of friction factors, the target load can achieve rotation freedom in three directions.

[0055] Two sets of linear bearing assemblies are symmetrically arranged up and down to form a set of linear bearing units; three sets of linear bearing units are arranged on the platform frame, namely the left bearing unit, the middle bearing unit and the right bearing unit. In the embodiment of the present invention, the axes of the three sets of linear bearing units are coplanar. The lifting assembly of the linear bearing unit located in the middle is slidably connected to fix the target load, and the lifting assemblies of the linear bearing units located on both sides are slidably connected to fix the reverse counterweight assembly. Figure 3 As shown, the linear bearing assembly includes: a bearing body 11, a bearing straight sleeve 12, a bearing ball sleeve 13, a cylinder 14, a mounting plate 15, a fastening nut 16, a first retaining ring 17, a bearing seat 18 and a bearing support 19.

[0056] Two sets of lifting assemblies are symmetrically mounted on the frame structure and connected to a central rod 32. The target load is fixedly connected to the lifting assemblies via the central rod 32. Each lifting assembly includes n fixed pulleys 21, n pulley brackets 22, a Kevlar rope 23, and a counterweight rod 24.

[0057] The bearing body 11, straight bearing sleeve 12, ball bearing sleeve 13, and bearing support 19 are assembled in sequence from the inside out. The bearing support 19 is fixed to one end of the cylinder 14 via a bearing seat 18 and standard components. The other end of the cylinder 14 is fixed to the mounting plate 15, which is fixed to the frame structure. The fastening nut 16 and first retaining ring 17 fit over the straight bearing sleeve 12 and work together to secure the axial position of the ball bearing sleeve 13. The bearing body 11 is a key component. The straight bearing sleeve 12, ball bearing sleeve 13, bearing seat 18, and bearing support 19 all serve to support the bearing body 11. The cylinder 14 is used to elevate the bearing, ensuring a certain distance h from the ground to ensure a sufficient amount of movement for the counterweight rod. The screws on the bearing seat 18, the first retaining ring 17, and the fastening nut 16 secure the bearing body from both the top and the bottom to prevent it from moving up and down.

[0058] The linear bearing assembly is mechanically secured to the platform frame. During assembly, the coaxiality of the upper and lower bearing bodies 11 within the same linear bearing unit must be maintained to prevent the middle rod 32 and counterweight rod 24 from deflecting during movement, thereby preventing motion obstruction. The left and right counterweight rods 24 are used to carry the counterweight, while the middle rod 32 is used to carry the target load. The left counterweight rod 24 and the middle rod 32 are connected by a Kevlar rope 23, and gravity equivalence is achieved through two fixed pulleys 21. Similarly, the right counterweight rod 24 and the middle rod 32 are also connected by a Kevlar rope 23, and gravity equivalence is achieved through two other fixed pulleys 21. The intermediate straight rod 32 and the counterweight straight rod 24 are respectively inserted into different bearing bodies 11. The intermediate straight rod 32 and the counterweight straight rod 24 can slide up and down in the bearing body 11. On the one hand, the linear bearing assembly is used to ensure the uniqueness of the movement of the intermediate straight rod 32 and the counterweight straight rod 24. On the other hand, the lubricity of the bearing can minimize the friction of the movement of the intermediate straight rod 32 and the counterweight straight rod 24.

[0059] The counterweight assembly is also divided into two groups, left and right. Each group uses two fixed pulleys 21 to change the direction of force. The counterweight assembly is used to offset the gravity of the target payload and achieve vertical freedom. The target payload in this design simulates the outer contour of the satellite, and the shape of the target payload can be adjusted according to the needs of the actual experiment.

[0060] like Figure 2As shown, the platform frame consists of: aluminum profile 1, angle bracket 2, counterweight rod 3, first counterweight block 4, air foot 5 and base plate 6. The aluminum profile used is 6060 type aluminum profile to build the basic skeleton of the device. The selection can be adjusted according to the mass of the actual device. Reinforcement ribs should be added at the fixed pulley where the force is greater to ensure that the entire frame does not deform after being subjected to force. A basic frame is built with aluminum profile 1. Angle bracket 2 is used to connect and fix the aluminum profiles 1 perpendicular to each other. The counterweight rod 3 is fixed to the base plate 6. The first counterweight block 4 is put on the counterweight rod 3 and tightened with a nut on the top. The first counterweight block 4 can be used to adjust the entire device to the same inertia characteristics as the simulated target object. The air foot 5 is fixed to the base plate 6, providing freedom in both horizontal and vertical rotation directions.

[0061] The bearing body 11 model is LMU20LUU. The outer surface of the bearing body 11 is covered with a bearing straight sleeve 12. The combination of the two is covered in the bearing ball sleeve 13. The combination of the bearing body 11, the bearing straight sleeve 12 and the bearing ball sleeve 13 is placed in the bearing seat 18. The bearing seat 18 is limited in the bearing support 19 by the way of tooth shoulder limit and screw connection to prevent up and down movement. The distance between the bottom of the bearing body 11 and the upper surface of the mounting plate 15 ( Figure 3 Where h) is the amount of sliding of the straight rod up and down in the linear bearing. This distance determines the vertical movement of the entire device. The first retaining ring 17 is installed below the bearing ball sleeve 13. At the same time, the first retaining ring 17 is fixed by the fastening nut 16. The two together realize the lower limit of the bearing ball sleeve 13. One side of the mounting plate 15 is connected to the cylinder 14, and the other side is fixed to the aluminum profile in the platform frame. The first retaining ring 17 is used to separate the bearing body 11 from its adjacent components to avoid movement blockage caused by friction and prevent debris from entering the interior of the bearing body 11. The fastening nut 16 is used to fix the first retaining ring 17. During actual use, the straight rod 32 and the counterweight straight rod 24 are all greased to ensure their smooth movement in the linear bearing assembly.

[0062] The center of the bearing ball sleeve 13 is provided with a through hole, through which the bearing body 11 is inserted. Both ends of the bearing ball sleeve 13 are processed with ball head structures, such as Figure 4 shown.

[0063] like Figure 5As shown, the hoisting assembly includes a fixed pulley 21, a pulley bracket 22, a Kevlar rope 23, and a counterweight rod 24. The reverse counterweight assembly includes a clamping block 25 and a second counterweight block 26. The counterweight rods 24 are inserted into the left and right sets of linear bearings in the linear bearing assembly, respectively, and can slide up and down. The middle rod 32 is inserted into the middle linear bearing in the linear bearing assembly, and can slide up and down. The counterweight rods 24 are connected to the middle rod 32 in the target load assembly via the Kevlar rope 23. The left and right counterweight rods 24 jointly pull the middle rod 32 up and down, indirectly driving the target load to move in the vertical direction.

[0064] The structure of the counterweight straight rod 24 and the middle straight rod 32 is as follows: Figure 6 As shown, a circular locking hook is installed at the top. One end of the Kevlar rope 23 is tied to the circular locking hook at the top of the counterweight rod 24, and the other end is tied to the circular locking hook of the middle rod 32 in the target load assembly. Gravity equivalence is achieved through the two rods of the fixed pulley 21. The fixed pulley 21 is fixed to the aluminum profile of the platform frame via the pulley bracket 22. The second counterweight block 26 passes through the counterweight rod 24 and is clamped by the clamping block 25 to prevent the second counterweight block 26 from sliding up and down. The mass of each second counterweight block 26 is equal to half the mass of the target load. The Kevlar rope has the characteristics of good flexibility, high load-bearing capacity, and light weight. The fixed pulley 21 is fixed to the aluminum profile of the platform frame via the pulley bracket 22. During the assembly process, it is necessary to ensure that the fixed pulley 21 is at the same height and on the same horizontal line, and to ensure that the tension applied by the Kevlar rope 23 is uniform and symmetrical. Furthermore, by raising the aluminum profile, interference between the two fixed pulleys 21 is avoided, and the two Kevlar cables 23 are prevented from being on the same axis, ensuring that the tension applied to the target load rod is in the same direction and magnitude. A second counterweight block 26 passes through the counterweight rod 24 and is clamped by a clamping block 25 to prevent it from sliding up and down.

[0065] The target payload of the present invention simulates a satellite, and its shape can be adjusted according to the test needs. Figure 7As shown, the target load bay 31 is fixedly connected to the ball bearing assembly 36, and is reinforced on both sides by load connectors 33 to prevent deformation of the target load bay 31. The intermediate straight rod 32 is inserted into the ball bearing assembly 36, and the clamping block 35 fixes the position of the ball bearing assembly 36 relative to the intermediate straight rod 32, ensuring that the ball bearing assembly 36 and the intermediate straight rod 32 maintain the same up and down motion, without relative sliding between the two. This ensures that the ball bearing and the target load move up and down with the straight rod within the linear bearing. One end of the first connector 34 is fixed to the ball bearing assembly 36, and the other end is fixed to the second connector 33. The second connector 34 is used to reinforce the load. During actual use, the first connector 34 and the second connector 33 can be redesigned based on the structural characteristics of the test object. The ball bearing assembly 36 is located in the center of the target load assembly. The ends of the counterweight adjustment rod 37 are fixed to the target load deck 31 via flanges. Four M20 nuts are mounted on the rod 37, sliding up and down along the rod's threads. By adjusting the distribution of the nuts on the four counterweight adjustment rods 37, the center of mass of the entire target load can be fine-tuned. The adjustment process is continuous and smooth, ultimately aligning the center of mass of the entire assembly with the center of ball bearing 362. The counterweight adjustment rods 37 are fixed to the target load via flanges, symmetrically distributed vertically and horizontally, for a total of four.

[0066] The central rod 32 of the entire assembly is connected to the cable 23 via an upper locking hook, allowing it to slide up and down. A ball bearing assembly 36 is secured to the central rod 32 via a clamping block 35. The target load deck 31, first connector 34, and second connector 33 are secured to the ball bearing assembly 36 via flanges. The counterweight adjustment rod 37 is secured to the target load 31. Thus, the entire mechanism functions as a single unit. The cable 23 drives the central rod 32, indirectly driving the entire assembly in vertical motion.

[0067] The ball bearing is located in the center of the entire assembly to ensure that the target load can rotate freely in three directions at a certain angle, such as Figure 8As shown, the ball bearing assembly 36 includes a connecting flange 361, a ball bearing 362, an upper fastening nut 363, a linear bearing 364, a bearing seat 365, a connecting rod 366, a second retaining ring 367, and a lower fastening nut 368. The connecting flange 361 is connected to the target load body at one end and to the connecting rod 366 at the other end. The linear bearing 364 is covered with the ball bearing 362. The combined assembly of the ball bearing 362 and the linear bearing 364 is secured to the bearing seat 365. The connecting rod 366 connects the bearing seat 365 to the connecting flange 361. The second retaining ring 367 is located between the ball bearing 362 and the lower fastening nut 368 to isolate the ball bearing 362 from the lower fastening nut 368 and reduce friction between them. The upper fastening nut 363 and the lower fastening nut 368 secure the ball bearing 362 to prevent it from sliding up and down. The linear bearing 364 is fixed to the middle straight rod 32 via upper and lower clamping blocks 35. The bearing seat 365 can rotate around the center relative to the ball bearing 362, and the bearing seat 365 and the ball bearing 362 are spherically matched.

[0068] The present invention adopts a method of cooperating tooth shoulders, fastening nuts and mechanical connections to ensure that the linear bearing has a certain margin in the vertical direction, effectively solves the problem of large resistance caused by different concentricity of bearings in the same group, and effectively reduces the requirements for assembly accuracy.

[0069] This paper designs a universal target load microgravity simulation device that achieves six degrees of freedom, effectively supporting ground-based testing. The platform frame assembly utilizes air feet to achieve two-dimensional translational freedom, counterweights to achieve vertical translational freedom, and ball bearings to achieve rotational freedom in three directions, ultimately achieving full-state microgravity simulation of the target load.

[0070] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are within the scope of protection of the technical solutions of the present invention. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0071] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A microgravity simulation device combining a ball bearing and a counterweight, characterized in that: include: Platform frame, linear bearing assembly, air foot (5), ball bearing assembly (36), hoisting assembly and counterweight assembly; The linear bearing assembly and the lifting assembly are fixedly mounted on the platform frame, and the linear bearing assembly is used to limit the vertical movement of the lifting assembly; The bottom of the platform frame is equipped with an air foot (5), which enables free movement on a smooth surface; The counterweight assembly is fixedly mounted on the hoisting assembly; the counterweight assembly is used to offset the weight of the target load so that the target load can move freely in the vertical direction; The target load is fixedly connected to the lifting assembly via a ball bearing assembly (36); the ball bearing assembly is used to limit the target load from rotating around the center; The platform frame comprises: an aluminum profile (1), an angle bracket (2), a counterweight rod (3), a counterweight block (4) and a bottom plate (6); A plurality of aluminum profiles (1) are fixedly connected via angle brackets (2) to form a frame structure; a bottom plate (6) is fixedly installed at the bottom of the frame structure; The counterweight rod (3) is fixedly mounted on the bottom plate (6), and the counterweight block (4) is fixedly mounted on the counterweight rod (3); Also included: an intermediate straight rod (32); The two sets of lifting components are symmetrically fixedly installed on the frame structure; the two sets of lifting components are commonly connected to the middle straight rod (32); The target load is fixedly connected to the lifting assembly via an intermediate straight rod (32); The linear bearing assembly comprises: a bearing body (11), a bearing straight sleeve (12), a bearing ball sleeve (13), a cylinder (14), a mounting plate (15), a fastening nut (16), a first retaining ring (17), a bearing seat (18) and a bearing support (19); The bearing body (11), the bearing straight sleeve (12), the bearing ball sleeve (13) and the bearing support (19) are sequentially mounted from the inside to the outside; The bearing support (19) is fixedly mounted on one end of the cylinder (14) through the bearing seat (18) and the standard part; the other end of the cylinder (14) is fixedly mounted on the mounting plate (15), and the mounting plate (15) is fixedly mounted on the frame structure; The fastening nut (16) and the first retaining ring (17) are sleeved on the bearing straight sleeve (12). The fastening nut (16) and the first retaining ring (17) are used in conjunction with each other to fix the axial position of the bearing ball sleeve (13).

2. A microgravity simulation device combining a ball bearing and a counterweight according to claim 1, characterized in that: Two sets of linear bearing assemblies are symmetrically arranged up and down to form a set of linear bearing units; three sets of linear bearing units are arranged on the platform frame, and the lifting assembly slidingly connected to the middle linear bearing unit is used to fix the target load, and the lifting assembly slidingly connected to the linear bearing units on both sides is used to fix the reverse counterweight assembly.

3. The microgravity simulation device combining a ball bearing and a counterweight according to claim 1, characterized in that: Each set of lifting components includes: n fixed pulleys (21), n ​​pulley brackets (22), a Kevlar rope (23) and a counterweight straight rod (24); n fixed pulleys (21) are fixedly mounted on the frame structure via pulley brackets (22); One end of the Kevlar rope (23) passes around the fixed pulley (21) and is connected to the counterweight straight rod (24), and the other end of the Kevlar rope (23) passes around the fixed pulley (21) and is connected to the middle straight rod; The two ends of the counterweight straight rod (24) are respectively inserted into the bearing bodies (11) of the two sets of linear bearing assemblies symmetrically arranged up and down, and the counterweight straight rod (24) can slide up and down along the axis of the bearing body (11); The n fixed pulleys (21) in the same group of lifting components have the same height, while the fixed pulleys (21) in different groups of lifting components have different heights; the axes of the Kevlar ropes (23) connected to the middle straight rod (32) coincide with each other.

4. The microgravity simulation device combining a ball bearing and a counterweight according to claim 3, characterized in that: The reverse counterweight assembly comprises: a clamping block (25) and a second counterweight block (26); The second counterweight block (26) is fixedly mounted on the counterweight straight rod (24) via a clamping block (25).

5. The microgravity simulation device combining a ball bearing and a counterweight according to claim 4, characterized in that: The weight of the second counterweight (26) is equal to half of the target load weight.

6. The microgravity simulation device combining a ball bearing and a counterweight according to claim 1, characterized in that: The ball bearing assembly (36) includes: upper and lower clamping blocks (35), a connecting flange (361), a ball bearing (362), an upper fastening nut (363), a linear bearing (364), a bearing seat (365), a connecting rod (366), a second retaining ring (367) and a lower fastening nut (368); The linear bearing (364), the ball bearing (362), the bearing seat (365) and the connecting rod (366) are sequentially mounted from the inside to the outside, and the linear bearing (364) is fixedly mounted on the middle straight rod (32) through the upper and lower clamping blocks (35); The upper fastening nut (363) and the lower fastening nut (368) are used in conjunction with each other to fix the axial position of the ball bearing (362); A second retaining ring (367) is provided between the lower fastening nut (368) and the ball bearing (362), and the second retaining ring (367) is used to reduce friction; The free end of the connecting rod (366) is fixedly connected to the inner wall of the target load via the connecting flange (361); The bearing seat (365) can rotate around the center relative to the ball bearing (362), and the bearing seat (365) and the ball bearing (362) are spherically matched.

7. The microgravity simulation device combining a ball bearing and a counterweight according to claim 6, characterized in that: Also includes: Counterweight adjustment rod (37) and nut; The counterweight adjusting rod (37) is fixedly mounted on the bulkhead of the target load, and the nut and the counterweight adjusting rod (37) are connected via a threaded pair.

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