A microgravity simulation device based on a magnetic constant force spring

Abstract

The present invention relates to a microgravity simulation device based on a magnetic constant force spring, comprising: a platform frame assembly, a linear bearing assembly, a magnetic constant force spring assembly and a target load assembly; the platform frame assembly provides a basic platform for installing other components; the linear bearing assembly is fixedly connected to the platform frame assembly to support the target load assembly, so that the target load assembly can slide axially along the linear bearing assembly, and the target load assembly is used to simulate the shape characteristics of the load; the magnetic constant force spring assembly provides an upward stable and constant pulling force for the target load assembly, so that the output force of the magnetic constant force spring cancels the gravity of the target load assembly to achieve microgravity equivalence. The present invention can achieve equivalence in six degrees of freedom, realize the freedom of a space load in six directions on the ground in a true sense, and provide a hardware basis for carrying out ground tests.

Description

Technical Field

[0001] The present invention relates to a microgravity simulation device based on a magnetic constant force spring, which can be used to achieve an equivalent microgravity state of a space payload in ground tests, providing convenience for analyzing its spatial motion state. Background Art

[0002] Space payloads are usually in a microgravity environment in space, while on the ground, due to the influence of gravity, equivalent conditions are usually not available. The environmental difference will not only affect the dynamic characteristics of the space payload itself, but also affect the dynamic characteristics when the payload collides and interacts with other devices. Moreover, the R & D cost and launch cost of space payloads are very high. Therefore, before the payload enters space, sufficient experimental verification and testing are required. How to achieve the simulation of the microgravity state of space payloads on the ground is a key problem that needs to be studied and solved urgently.

[0003] Common microgravity equivalent methods include: water floating method, suspension method, parabolic flight method, and air floating method. Each of these methods has the following problems:

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

[0005] (2) Suspension method: The disadvantages are that the microgravity simulation accuracy is not high, the truss mechanism of the support rope is complex, occupying a large space, the friction force suffered by the rope during movement is large, seriously affecting the test accuracy. The active suspension method is prone to interference. In addition, factors such as the flexibility, jitter of the rope and the inertial effect of the counterweight will have an adverse impact on microgravity simulation.

[0006] (3) Parabolic flight method: The disadvantages are high cost, limited shape and size and weight of the test equipment, need to consider flight safety, and short microgravity simulation time.

[0007] (4) Air floating method: The disadvantages are that the existing equipment can only achieve microgravity simulation of 3 degrees of freedom in a plane. Using air floating bearings has a high cost, complicated installation, and expensive and complex equipment maintenance.

[0008] Therefore, it is very difficult for existing microgravity simulation devices to achieve full-dimensional equivalence for the target payload. Summary of the Invention

[0009] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, a microgravity simulation device based on a magnetic constant force spring is proposed, which can achieve equivalence of 6 degrees of freedom, realizing the freedom of a space payload in six directions on the ground in a true sense, providing a hardware basis for carrying out ground tests.

[0010] The technical solution of the present invention is as follows:

[0011] A microgravity simulation device based on a magnetic constant force spring, comprising: a platform frame assembly, a linear bearing assembly, a magnetic constant force spring assembly and a target load assembly;

[0012] The platform frame assembly provides a basic platform for installing other components; the linear bearing assembly is fixedly connected to the platform frame assembly to support the target load assembly, enabling the target load assembly to slide axially along the linear bearing assembly, and the target load assembly is used to simulate the shape characteristics of the load; the magnetic constant force spring assembly provides an upward stable and constant pulling force for the target load assembly, so that the output force of the magnetic constant force spring cancels the gravity of the target load assembly, realizing microgravity equivalence.

[0013] Furthermore, the platform frame assembly includes: aluminum profiles, corner codes, counterweight rods, counterweight blocks, air feet and a bottom plate; the aluminum profiles are built into a cuboid skeleton structure, with reinforcing ribs provided at the fixed pulley installation positions, and corner codes are used at the joints of mutually perpendicular aluminum profiles to increase the stability of the entire device; the bottom plate is located at the bottom of the cuboid skeleton structure, a counterweight rod is fixed on the bottom plate, the counterweight block is sleeved on the counterweight rod and tightened and fixed by a nut, and the counterweight block is used to adjust the entire device to have the same inertia characteristics as the simulated target object; the air feet are fixed under the bottom plate to provide degrees of freedom in two horizontal directions and the vertical rotation direction.

[0014] Furthermore, 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 retaining ring, a bearing seat, a bearing support;

[0015] The outside of the bearing body is sleeved with a bearing straight sleeve, and the combination of the two is sleeved in the bearing ball sleeve. The combination formed by the bearing body, the bearing straight sleeve and the bearing ball sleeve is placed in the bearing seat. The bearing seat is sleeved in the bearing support through shoulder limiting and screw connection for limiting. The distance h between the bottom of the bearing body and the upper surface of the mounting plate is the amount of up and down sliding of the middle straight rod protruding from the target load assembly in the bearing body; the retaining ring is installed below the bearing ball sleeve, and at the same time, the retaining ring is fixed by the fastening nut, and the two together realize lower limit for the bearing ball sleeve. One side of the mounting plate is connected to the bearing straight sleeve, and the other side is fixed to the aluminum profile in the platform frame assembly; a through hole is opened in the center of the bearing ball sleeve, and the bearing body passes through it, and ball head structures are processed at both ends of the bearing ball sleeve.

[0016] Furthermore, the linear bearing assembly has a certain margin in the vertical direction.

[0017] Furthermore, the distance h is the moving amount of the target load assembly in the vertical direction.

[0018] Furthermore, the test object simulated by the microgravity simulation device is a general satellite.

[0019] Further, the target load component includes: a target load body, an intermediate straight rod, a first load connecting member, a second load connecting member, a clamping block, a ball bearing assembly, and a counterweight adjusting rod; wherein the intermediate straight rod, the clamping block, the ball bearing assembly, and the counterweight adjusting rod are simulation devices, and the target load body, the first load connecting member, and the second load connecting member are test objects;

[0020] The target load body is fixedly connected to the ball bearing assembly, and the target load body is reinforced by the first load connecting member to prevent deformation of the target load body; the intermediate straight rod is sleeved in the ball bearing assembly, and the clamping block fixes the position of the ball bearing assembly relative to the intermediate straight rod to ensure that the ball bearing assembly and the intermediate straight rod move up and down together without relative sliding; one end of the second load connecting member is fixed to the ball bearing assembly, and the other end is fixed to the first load connecting member, and the second load connecting member is used to reinforce the load; the ball bearing assembly is located at the central position of the target load component;

[0021] Both ends of the counterweight adjusting rod are fixedly connected to the target load body through flanges. A number of nuts are distributed on the counterweight adjusting rod, and the nuts slide up and down along the threads on the counterweight adjusting rod. By adjusting the distribution of the nuts on the counterweight adjusting rod, the centroid of the entire target load component is adjusted to ensure that the centroid of the target load component coincides with the centroid of the target load.

[0022] Further, the central straight rod is connected to the magnetic constant force spring assembly through a hook at the upper part and makes a sliding movement up and down; the ball bearing assembly is fixedly connected to the central straight rod through the clamping block, and the test object is fixedly connected to the ball bearing assembly through a flange. The entire set of target load components is an integral whole, and the magnetic constant force spring assembly drives the intermediate straight rod to indirectly drive the entire target load component to move up and down.

[0023] Further, the ball bearing assembly includes: a connecting flange, a ball bearing, an upper fastening nut, a linear bearing, a bearing seat, a connecting rod, a lower retaining ring, and a lower fastening nut;

[0024] One end of the connecting flange is connected to the target load body, and the other end is connected to the connecting rod. The ball bearing is sleeved outside the linear bearing, and the combination of the ball bearing and the linear bearing is fixed on the bearing seat together. The connecting rod connects the bearing seat and the connecting flange. The lower retaining ring is located between the ball bearing and the lower fastening nut to isolate the ball bearing from the lower fastening nut and reduce the friction between the two. The upper fastening nut and the lower fastening nut are used to fix the ball bearing to prevent it from sliding up and down.

[0025] Further, the magnetic constant force spring assembly includes: a fixed pulley, a pulley bracket, a Kevlar rope, a fixed flange, and two magnetic constant force springs, one on the left and one on the right;

[0026] Both the left and right magnetic constant force springs include: a fixed flange, a stator, an annular locking hook, and a mover; the annular locking hook is arranged on the mover; the fixed flange is fixedly connected to the aluminum profile;

[0027] One end of a Kevlar rope is tied to the annular locking hook of the magnetic constant force spring, and the other end is tied to the middle straight rod in the target load assembly. The gravity equivalence is achieved through a fixed pulley; the fixed pulley is fixed to the aluminum profile of the platform frame assembly through a pulley bracket; during the assembly process, the fixed pulleys corresponding to the same magnetic constant force spring are at the same height and on the same horizontal line to ensure that the tension exerted by the Kevlar rope is uniform and symmetric; the two Kevlar ropes led out from the left and right magnetic constant force springs are on the same axis above the connection of the middle straight rod to ensure that the tension applied to the middle straight rod of the target load is in the same direction and of the same magnitude.

[0028] The beneficial effects of the present invention compared with the prior art are as follows:

[0029] (1) Based on the original air-floating method, the present invention adopts a method combining a magnetic constant force spring and a ball bearing, overcoming the defect that the original air-floating method cannot achieve microgravity simulation in the vertical direction and three rotational directions, and truly realizing the microgravity simulation of six degrees of freedom of the space load.

[0030] (2) On the one hand, the present invention ingeniously designs a symmetric gravity equivalence device based on the magnetic constant force spring. On the other hand, it adopts a high-low staggered method to ensure that the Kevlar ropes are on the same axis, minimizing the problem of mutual jamming caused by non-parallel linear slide rails, different concentricity of bearings, and rope tension deviation, and ensuring the smoothness of the whole device.

[0031] (3) The present invention adopts a method combining a tooth shoulder, a fastening nut, and mechanical connection to ensure that the linear bearing has a certain margin in the vertical direction, effectively solving the problem of large resistance caused by different concentricity of the same group of bearings, and effectively reducing the requirement for assembly accuracy.

[0032] (4) The present invention designs a counterweight adjustment rod in the target load assembly. By adjusting the height of the nut thereon, the fine adjustment of the target load attitude can be achieved, ensuring that the center of mass of the target load assembly coincides with the centroid of the target load. Description of the Drawings

[0033] Figure 1 It is a diagram of the component division of the device of the present invention;

[0034] Figure 2 It is a structural diagram of the platform frame of the present invention;

[0035] Figure 3 It is a structural diagram of the linear bearing of the present invention;

[0036] Figure 4Structural diagram of the magnetic constant force spring assembly of the present invention;

[0037] Figure 5 Structural diagram of the magnetic constant force spring of the present invention;

[0038] Figure 6 Structural diagram of the target load of the present invention;

[0039] Figure 7 Structural diagram of the ball bearing of the present invention. Detailed implementation manner

[0040] As Figure 1 shown, a microgravity simulation device based on a magnetic constant force spring proposed by the present invention can be divided into four parts: a platform frame, a linear bearing assembly, a magnetic constant force spring assembly, and a target load assembly. The platform frame assembly provides a basic platform for installing other components; the linear bearing assembly is fixedly connected to the platform frame assembly to support the target load assembly, enabling the target load assembly to slide axially along the linear bearing assembly. The target load assembly is used to simulate the shape characteristics of the load; the magnetic constant force spring assembly provides an upward stable and constant pulling force for the target load assembly, so that the output force of the magnetic constant force spring cancels the gravity of the target load assembly, realizing microgravity equivalence.

[0041] As Figure 2 shown, the platform frame part includes: aluminum profile 1, angle code 2, counterweight rod 3, counterweight block 4, air foot 5, and bottom plate 6; the aluminum profile 1 is built into a cuboid skeleton structure, with reinforcing ribs set at the fixed pulley installation position, and angle codes 2 are used at the joints of mutually perpendicular aluminum profiles 1 to increase the stability of the entire device; the bottom plate 6 is located at the bottom of the cuboid skeleton structure, a counterweight rod 3 is fixed on the bottom plate 6, the counterweight block 4 is sleeved on the counterweight rod 3 and tightened and fixed by nuts. The counterweight block 4 is used to adjust the entire device to have the same inertia characteristics as the simulated target object; the air foot 5 is fixed below the bottom plate 6 to provide degrees of freedom in two horizontal directions and the vertical rotation direction.

[0042] As Figure 3 shown, the linear bearing assembly includes: bearing body 11, bearing straight sleeve 12, bearing ball sleeve 13, cylinder 14, mounting plate 15, fastening nut 16, retaining ring 17, bearing seat 18, and bearing support 19.

[0043] The outer part of the linear bearing body 11 is sleeved with a bearing straight sleeve 12, and the combination of the two is sleeved in a bearing ball sleeve 13. The combination formed by the linear bearing body 11, the bearing straight sleeve 12, and the bearing ball sleeve 13 is placed in a bearing seat 18. The bearing seat 18 is sleeved in a bearing support 19 through shoulder limiting and screw connection for limiting. The distance (h in the figure) between the bottom of the linear bearing body 11 and the upper surface of the mounting plate 15 is the amount of up and down sliding of the straight rod in the linear bearing. This distance determines the moving amount of the whole device in the vertical direction. A retaining ring 17 is installed below the bearing ball sleeve 13 and is fixed by a fastening nut 16 at the same time. The two jointly achieve lower limit for the bearing ball sleeve. One side of the mounting plate 15 is connected to the bearing straight sleeve 12, and the other side is fixed to the aluminum profile in the platform frame. A through hole is opened in the center of the bearing ball sleeve 13, and the linear bearing body 11 is inserted therein. The two ends of the bearing ball sleeve 13 are processed with ball head structures.

[0044] Preferably, the linear bearing assembly has a certain margin in the vertical direction.

[0045] Preferably, the distance h is the moving amount of the target load assembly in the vertical direction.

[0046] As Figure 4 , 5 shown, the magnetic constant force spring assembly includes: a fixed pulley 21, a pulley bracket 22, a Kevlar rope 23, a fixed flange 24, and left and right magnetic constant force springs 25. The structure of the magnetic constant force spring is as Figure 5 shown. Both the left and right magnetic constant force springs 25 include: a fixed flange 251, a stator 252, an annular locking hook 253, and a mover 254; the annular locking hook 253 is arranged on the mover 254; the fixed flange 251 is fixedly connected to the aluminum profile;

[0047] One end of the Kevlar rope 23 is tied to the annular locking hook 253 of the magnetic constant force spring, and the other end is tied to the middle straight rod in the target load assembly to achieve gravity equivalence through the fixed pulley 21. Specifically, both the left and right magnetic constant force springs 25 are connected to the middle straight rod of the target load through Kevlar ropes and two fixed pulleys to jointly provide tension.

[0048] The fixed pulley 21 is fixed on the aluminum profile of the platform frame assembly through the pulley bracket 22; during the assembly process, the fixed pulleys 21 corresponding to the same magnetic constant force spring 25 are at the same height and on the same horizontal line to ensure that the pulling forces exerted by the Kevlar ropes 23 are uniform and symmetric; the two Kevlar ropes 23 led out from the left and right magnetic constant force springs 25 are on the same axis above the connecting middle straight rod to ensure that the pulling forces exerted on the middle straight rod of the target load are in the same direction and of the same magnitude. Specifically, when implementing, the two fixed pulleys corresponding to one side of the magnetic constant force spring 25 can be raised by using the aluminum profile, which avoids interference between the two adjacent fixed pulleys 21 in the middle, and at the same time ensures that the two Kevlar ropes 23 are on the same axis, ensuring that the pulling forces exerted on the straight rod of the target load are in the same direction and of the same magnitude.

[0049] As Figure 6 shown, the target load assembly includes: a target load body 31, a middle straight rod 32, a first load connecting piece 33, a second load connecting piece 34, a clamping block 35, a ball bearing assembly 36, and a counterweight adjusting rod 37. Among them, 32, 35, 36, and 37 are simulation devices, and 31, 33, and 34 are test objects. The test object simulated by the microgravity simulation device of the present invention is a general satellite.

[0050] The target load body 31 is fixedly connected to the ball bearing assembly 36 through a connecting flange 361, and both sides are reinforced by the load connecting pieces 33 to prevent the target load 31 from deforming; the middle straight rod 32 is sleeved in the ball bearing assembly 36, and the clamping block 35 fixes the position of the ball bearing assembly 36 relative to the middle straight rod 32, which can ensure that the ball bearing assembly 36 and the middle straight rod 32 move up and down in the same manner without relative sliding between them; one end of the second load connecting piece 34 is fixed on the ball bearing assembly 36, and the other end is fixed on the first load connecting piece 33. The second load connecting piece 34 is used to reinforce the load. 31, 33, and 34 are all test objects, and secondary design can be carried out according to the structural characteristics of the test object during actual use; the ball bearing assembly 36 is located in the center of the target load assembly. Both ends of the counterweight adjusting rod 37 are fixedly connected to the target load body 31 through flanges. There are 4 M20 nuts distributed on the counterweight adjusting rod 37, and the nuts can slide up and down along the threads on the counterweight adjusting rod. By adjusting the distribution of the nuts on the four counterweight adjusting rods, the centroid of the entire target load can be finely adjusted to ensure that the centroid of the target load assembly is exactly located in the center of the mechanism. The central straight rod in the whole set of components is connected to the Kevlar rope 23 through the upper hook and can slide up and down. The ball bearing assembly 36 is fixedly connected to the central straight rod through the clamping block 35. The test objects 31, 33, and 34 are fixedly connected to the ball bearing assembly through flanges, and the counterweight adjusting rod 37 is fixedly connected to the target load 31. Therefore, the whole set of mechanisms is an integral body, and the middle straight rod 32 is driven by the Kevlar rope 23 to indirectly drive the whole assembly to move up and down.

[0051] AsFigure 7 As shown in the figure, the ball bearing assembly 36 can be further divided into: 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 lower retaining ring 367, and a lower fastening nut 368.

[0052] One end of the connecting flange 361 is connected to the target load body, and the other end is connected to the connecting rod 366. The outer sleeve of the linear bearing 364 is provided with a ball bearing 362. The combination formed by 362 and 364 is fixed on the bearing seat 365 together. The connecting rod 366 connects the bearing seat 365 and the connecting flange 361. The lower retaining ring 367 is located between the ball bearing 362 and the lower fastening nut 368, used to isolate 362 and 368 to reduce the friction between them. The upper fastening nut 363 and the lower fastening nut 368 are used to fix the ball bearing to prevent it from sliding up and down.

[0053] Embodiment:

[0054] As Figure 1 shown in the figure, an embodiment of the present invention provides a microgravity simulation device based on a magnetic constant force spring, which can be divided into four parts: a platform frame, a linear bearing assembly, a magnetic constant force spring assembly, and a target load assembly.

[0055] Among them, the linear bearing assembly is fixed on the platform frame by mechanical connection. The two linear bearing assemblies are symmetrically distributed up and down. During the assembly process, it is necessary to ensure the coaxiality of the upper and lower linear bearing assemblies in the same group to avoid attitude deflection of the straight rod during its movement, which may cause movement obstruction. The upper and lower linear bearings located in the center are used to carry the target load;

[0056] The magnetic constant force spring assembly is divided into left and right groups. Each group of magnetic constant force spring assemblies uses 2 fixed pulleys to change the direction of the force, used to offset the gravity of the target load and achieve freedom in the vertical direction. The straight rod carrying the target load assembly is connected to the annular hook of the magnetic constant force spring assembly through a Kevlar rope. The straight rod is located inside the linear bearing and can slide up and down. The target load in this design simulates the outer contour of a satellite, and the shape of the target load can be adjusted according to the actual experimental needs.

[0057] The platform frame part includes: aluminum profile 1, angle bracket 2, counterweight rod 3, counterweight block 4, gas foot 5, bottom plate 6; the aluminum profile adopts 6060 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 whole frame does not deform after the force is applied. Angle brackets are used at mutually perpendicular aluminum profiles to increase the stability of the whole device. The counterweight rod is fixed on the bottom plate, and the counterweight block is sleeved in the counterweight rod and tightened with nuts on the top. The counterweight can be used to adjust the whole device to the same inertia characteristics as the simulated target object. The gas foot is fixed to the bottom plate, providing freedom in both horizontal and vertical directions of rotation.

[0058] There are two linear bearing assemblies, each of which includes: linear bearing 11, bearing straight sleeve 12, bearing ball sleeve 13, cylinder 14, mounting plate 15, fastening nut 16, retaining ring 17, bearing seat 18. The linear bearing model is LMU20LUU. The linear bearing is covered with a bearing straight sleeve on the outside. The combination of the two is covered in the ball sleeve. The combination is placed in the bearing seat. The upper and lower teeth of the bearing seat are used to position the combination to prevent up and down movement. The bearing seat is installed on the cylinder, and the straight rod moves up and down in the cylinder. The height of the cylinder determines the up and down movement of the whole device. One side of the mounting plate is connected to the straight sleeve, and the other side is fixed to the aluminum profile in the platform frame; the retaining ring is used to separate the bearing from its adjacent components to avoid movement blockage caused by friction and prevent debris from entering the bearing. The fastening nut is used to fix the lower retaining ring. In actual use, the straight rod is fully greased to ensure its smooth movement in the linear bearing.

[0059] The magnetic constant force spring assembly comprises: a fixed pulley, a pulley bracket, a Kevlar rope, a fixing flange, and a magnetic constant force spring. The magnetic constant force spring comprises: a stator, an annular locking hook, and a mover.

[0060] One end of the Kevlar rope is tied to the mover of the magnetic constant force spring, and the other end is tied to the central straight rod of the target load. The tension output by the magnetic constant force spring is equal to half of the weight of the target load, and the two magnetic constant force springs achieve the microgravity equivalence of the target load. The Kevlar rope has the characteristics of good flexibility, large load-bearing tension and light weight. The fixed pulley is fixed to the aluminum profile of the platform frame through the pulley bracket. During the assembly process, it is necessary to ensure that the fixed pulleys are at the same height and on the same horizontal line, and to ensure that the tension applied by the Kevlar rope is uniform and symmetrical. In addition, by raising the aluminum profile, interference between the two fixed pulleys in the middle is avoided, and at the same time, the two strands of Kevlar rope are avoided from being on the same axis, ensuring that the tension applied to the straight rod of the target load is in the same direction, size, and symmetrical distribution.

[0061] The target load component includes: a target load, an intermediate straight rod, a first load connecting member, a second load connecting member, upper and lower clamping blocks, a spherical bearing, and a counterweight adjusting rod. The target load of the present invention simulates a satellite, and its shape can be adjusted according to test requirements. The target load is fixedly connected to the spherical bearing located at its center through a connecting flange, and both sides are reinforced by the first load connecting member to prevent deformation. The straight rod is sleeved in the spherical bearing and fixed in position by the upper and lower clamping blocks, which can ensure that the spherical bearing and the target load move up and down in the linear bearing together with the straight rod. One end of the second load connecting member is fixed on the spherical bearing, and the other end is connected to the first load connecting member. The counterweight adjusting rod is composed of 4 M12 studs, on which nuts can be embedded. By screwing the nuts, the centroid of the target load can be finely adjusted, and the adjustment process is continuous and smooth. Finally, the centroid of the target load component can be made to coincide with the centroid of the target load.

[0062] The spherical bearing is located in the center of the entire component, ensuring that the target load can freely rotate a certain angle in three directions. The spherical bearing can be further divided into: a connecting flange, a spherical bearing, an upper retaining ring, a linear bearing, a bearing seat, a connecting rod, a lower retaining ring, and a fastening nut. The connecting flange is used to connect the spherical bearing assembly to the target load. The linear bearing is sleeved with the spherical bearing, and the combination is fixed on the bearing seat together. The connecting rod connects the bearing seat and the connecting flange. The upper and lower retaining rings are used to isolate the bearing from the clamping blocks, and the fastening nut is located below the lower retaining ring to fix the bearing. The counterweight adjusting rods are fixed to the target load through flanges, symmetrically distributed in the up, down, left, and right directions, with a total of four.

[0063] Based on the original air-floating method, the present invention combines a magnetic constant force spring with a spherical bearing, overcoming the defect that the original air-floating method cannot achieve microgravity simulation in the vertical direction and three rotational directions, and truly realizes the microgravity simulation of six degrees of freedom for space loads.

[0064] The content described in the present invention is an example of specific applications in this field. However, any professional familiar with this field should clearly understand that the present invention includes but is not limited to this example. Any modification made on this basis falls within the scope of protection of the knowledge and technical property rights of the present invention.

Claims

1. A microgravity simulation device based on a magnetic constant force spring, characterized in that Including: a platform frame component, a linear bearing component, a magnetic constant force spring component and a target load component; The platform frame component provides a basic platform for installing other components; the linear bearing component is fixedly connected to the platform frame component to support the target load component, so that the target load component can slide axially along the linear bearing component, and the target load component is used to simulate the shape characteristics of the load; the magnetic constant force spring component provides an upward stable and constant pulling force for the target load component, so that the output force of the magnetic constant force spring cancels the gravity of the target load component to achieve micro-gravity equivalence; The linear bearing component 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 retaining ring (17), a bearing seat (18), a bearing support (19); The outside of the bearing body (11) is sleeved with a bearing straight sleeve (12), and the combination of the two is sleeved in the bearing ball sleeve (13). The combination formed by 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 position by shoulder limit and screw connection and is sleeved in the bearing support (19) to achieve position limitation. The distance h between the bottom of the bearing body (11) and the upper surface of the mounting plate (15) is the amount of up and down sliding of the middle straight rod protruding in the bearing body (11) in the target load component; the retaining ring (17) is installed below the bearing ball sleeve (13), and at the same time, the retaining ring (17) is fixed by the fastening nut (16), and the two jointly limit the lower position of the bearing ball sleeve. 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 component; a through hole is opened in the center of the bearing ball sleeve (13), and the bearing body (11) passes through it, The two ends of the bearing ball sleeve (13) are processed with ball head structures; the bearing seat (18) is installed on the cylinder (14).

2. The microgravity simulation device based on a magnetic constant force spring according to claim 1, wherein: The platform frame component includes: an aluminum profile (1), an angle code (2), a counterweight rod (3), a counterweight block (4), an air foot (5) and a bottom plate (6); the aluminum profile (1) is built into a cuboid skeleton structure, and a reinforcing rib is provided at the fixed pulley installation position, and the angle code (2) is used at the connection of the mutually perpendicular aluminum profiles (1) to increase the stability of the whole device; the bottom plate (6) is located at the bottom surface of the cuboid skeleton structure, the counterweight rod (3) is fixed on the bottom plate (6), the counterweight block (4) is sleeved on the counterweight rod (3) and is fixed by tightening with a nut, and the counterweight block (4) is used to adjust the whole device to have the same inertia characteristics as the simulated target object; the air foot (5) is fixed below the bottom plate (6) to provide degrees of freedom in two horizontal directions and the vertical rotation direction.

3. The microgravity simulation device based on a magnetic constant force spring according to claim 1, characterized in that: The distance h is the moving amount of the target load component in the vertical direction.

4. A microgravity simulation device based on a magnetic constant force spring according to claim 1, characterized in that: The test object simulated by the micro-gravity simulation device is a general satellite.

5. A microgravity simulation device based on a magnetic constant force spring according to claim 1, characterized in that: The target load component includes: a target load body (31), an intermediate straight rod (32), a first load connecting member (33), a second load connecting member (34), a clamping block (35), a ball bearing assembly (36), and a counterweight adjusting rod (37); among them, the intermediate straight rod (32), the clamping block (35), the ball bearing assembly (36), and the counterweight adjusting rod (37) are simulation devices, and the target load body (31), the first load connecting member (33), and the second load connecting member (34) are test objects; The target load body (31) is fixedly connected to the ball bearing assembly (36), and the target load body (31) is reinforced by the first load connecting member (33) to prevent the target load body (31) from deforming; the intermediate straight rod (32) is sleeved in 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) to ensure that the ball bearing assembly (36) and the intermediate straight rod (32) move up and down together without relative sliding; one end of the second load connecting member (34) is fixed to the ball bearing assembly (36), and the other end is fixed to the first load connecting member (33), and the second load connecting member (34) is used to reinforce the load; the ball bearing assembly (36) is located at the central position of the target load component; Both ends of the counterweight adjusting rod (37) are fixedly connected to the target load body (31) through flanges. A number of nuts are distributed on the counterweight adjusting rod (37), and the nuts slide up and down along the threads on the counterweight adjusting rod. By adjusting the distribution of the nuts on the counterweight adjusting rod, the centroid of the entire target load component is adjusted to ensure that the centroid of the target load component coincides with the centroid of the target load.

6. The microgravity simulation device based on a magnetic constant force spring according to claim 5, wherein: The intermediate straight rod (32) is connected to the magnetic constant force spring assembly through a hook at the upper part and makes a sliding movement up and down; the ball bearing assembly (36) is fixedly connected to the intermediate straight rod through the clamping block (35), and the test object is fixedly connected to the ball bearing assembly through a flange. The entire set of target load components is an integral whole. The magnetic constant force spring assembly drives the intermediate straight rod (32), indirectly driving the entire target load component to move up and down.

7. A microgravity simulation device based on a magnetic constant force spring according to claim 5 or 6, characterized in that: 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 lower retaining ring (367), and a lower fastening nut (368); One end of the connecting flange (361) is connected to the target load body (31), and the other end is connected to the connecting rod (366). The ball bearing (362) is sleeved outside the linear bearing (364). The combination of the ball bearing (362) and the linear bearing (364) is fixed on the bearing seat (365) together. The connecting rod (366) connects the bearing seat (365) and the connecting flange (361). The lower 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 the friction between the two. The upper fastening nut (363) and the lower fastening nut (368) are used to fix the ball bearing to prevent it from sliding up and down.

8. A microgravity simulation device based on a magnetic constant force spring according to claim 5, characterized in that: The magnetic constant force spring assembly includes: a fixed pulley (21), a pulley bracket (22), a Kevlar rope (23), a fixed flange (24), and left and right magnetic constant force springs (25); The left and right magnetic constant force springs (25) both include: a fixed flange (251), a stator (252), an annular locking hook (253), and a mover (254); the annular locking hook (253) is arranged on the mover (254); the fixed flange (251) is fixedly connected to the aluminum profile of the platform frame assembly; One end of the Kevlar rope (23) is tied to the annular locking hook (253) of the magnetic constant force spring, and the other end is tied to the middle straight rod in the target load assembly, and the gravity equivalence is achieved through the fixed pulley (21); the fixed pulley (21) is fixed to the aluminum profile of the platform frame assembly through the pulley bracket (22); during the assembly process, the fixed pulleys (21) corresponding to the same magnetic constant force spring (25) are at the same height and on the same horizontal line to ensure that the tension applied by the Kevlar rope (23) is uniform and symmetric; the two Kevlar ropes (23) led out by the left and right magnetic constant force springs (25) are on the same axis above the connection of the middle straight rod to ensure that the tension applied to the middle straight rod of the target load is in the same direction and of the same magnitude.

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