Adjustable constant-force magnetic spring precision positioning platform

Abstract

The utility model provides an adjustable constant force magnetic spring precision positioning platform, which comprises a first platform body, a second platform body and a magnetic spring assembly, the magnetic spring assembly comprises a fixed seat, the fixed seat is fixedly arranged on the second platform body, an outer magnet is arranged on the fixed seat, and an inner magnet corresponding to the outer magnet is arranged in a sleeve; an adjusting body is arranged on the first platform, a supporting seat is arranged on the second platform, one end of the sleeve is connected with the supporting body, the other end of the sleeve is connected with an adjusting part, and the rotating angle of the inner magnet in the sleeve is adjusted through the adjusting part. The utility model has the advantages of higher load capacity, adjustable load capacity, wide range, convenience in load balance adjustment, and high positioning precision and repetition precision.

Description

Technical Field

[0001] This utility model relates to a translation stage structure, and more particularly to an adjustable constant force magnetic spring precision positioning platform. Background Technology

[0002] In today's era of rapid technological advancement, various industries are placing increasingly stringent demands on the performance of high-end equipment, particularly regarding operational stability and repeatability. Whether it's the precise imaging of medical optical scanning equipment or the reliable measurement of precision testing equipment, both rely on rigorous control of the vertical axis's operational stability. However, vertical loads often negatively impact equipment stability and repeatability due to the gravitational force of the load. When the load moves vertically, the thrust demand of the drive motor varies significantly depending on the load size; the larger the load, the more pronounced the thrust difference, undoubtedly posing a significant challenge to the equipment's stability and repeatability.

[0003] Currently, there are two main solutions commonly available to overcome gravity. One is to use conventional tension springs to balance gravity. However, because the tension of the spring changes with the length of the extension, it is difficult to achieve true balance throughout the entire range of motion of the load. The other solution is to use constant force springs to balance gravity. Although constant force springs can provide a relatively stable force to some extent, they are more expensive, and under high loads, their size becomes larger, increasing the difficulty of design and installation. In addition, the output force of constant force springs is fixed and cannot be adjusted. This requires precise consideration of the load weight during the design phase. Once the design is slightly changed, it may be necessary to redesign the balancing counterweight, which brings many inconveniences to practical applications. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide an adjustable constant force magnetic spring precision positioning platform.

[0005] The purpose of this utility model is achieved through the following technical solution: an adjustable constant force magnetic spring precision positioning platform, including a first platform body, a second platform body, and a magnetic spring assembly. The magnetic spring assembly includes a fixed seat, which is fixedly mounted on the second platform body. An outer magnet is mounted on the fixed seat, and an inner magnet corresponding to the outer magnet is mounted in the sleeve. An adjusting body is mounted on the first platform, and a support seat is mounted on the second platform. One end of the sleeve is connected to the support body, and the other end of the sleeve is connected to the adjusting component. The rotation angle of the inner magnet in the sleeve is adjusted by the adjusting component.

[0006] Preferably, the outer magnet is a tile magnet, and the inner magnet is a cylindrical magnet, with the cylindrical magnet located between the two tile magnets.

[0007] Preferably, the fixing base is provided with a through hole, and the external magnet is fixed on the inner wall of the through hole.

[0008] Preferably, the sleeve is provided with a first end and a second end at both ends, the first end is connected to the adjusting member, a bearing is provided on the support body, and the second end is connected to the bearing on the support body.

[0009] Preferably, the adjusting body is provided with a clamping hole and a locking screw hole, a locking screw is connected in the locking screw hole, and the first end is connected in the clamping hole, so that the first end can be locked or loosened by the locking screw.

[0010] Preferably, the adjusting member is provided with a connecting hole, and the adjusting member is connected to the first platform body by a connecting screw.

[0011] Preferably, a torsion groove is provided on the first end.

[0012] The beneficial effects of this invention are: 1. Higher load capacity: Within the same size, this invention can bear a greater load. This means that without increasing the size of the device, the load capacity can be significantly improved, thereby meeting the needs of higher precision and more complex tasks. For example, in medical optical scanning equipment, higher load capacity can support heavier detectors or imaging components, thereby achieving higher quality image acquisition.

[0013] 2. Adjustable and wide-ranging load capacity: The thrust of the magnetic spring assembly of this utility model is not only adjustable, but also has a very large adjustment range. This feature allows the equipment to flexibly adjust the thrust when facing different weight loads or different working conditions to achieve the best balance effect. Whether under light or heavy load conditions, precise gravity compensation can be achieved through simple adjustment, ensuring that the stability and repeatability of the equipment are not affected by load changes.

[0014] 3. Convenient load balance adjustment: The constant force adjustment process of this invention is extremely convenient, requiring no complicated tools or cumbersome steps, which greatly improves the ease of operation.

[0015] 4. High positioning accuracy and repeatability: This invention has good repeatability and stability. Under load, it can achieve a repeatability accuracy within 0.2μm and a stable fluctuation range of ±30nm when stationary. Once adjusted, the system can maintain a constant force output throughout the entire working range without force fluctuations due to changes in load position or the passage of time. This stability ensures that the equipment maintains high-precision performance during long-term operation and reduces the risk of errors and failures caused by unstable force values. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the magnetic spring assembly.

[0018] Figure 3 This is an exploded view of the magnetic spring assembly.

[0019] Figure 4 This is a schematic diagram of the adjusting component.

[0020] Figure 5 This is a schematic diagram showing the interaction between the inner and outer magnets.

[0021] In the figure: 1. First platform body, 2. Second platform body, 3. Fixed seat, 4. Sleeve, 5. First end, 6. Adjusting component, 7. Support body, 8. Second end, 9. Outer magnet, 10. Inner magnet, 11. Clamping hole, 12. Locking screw hole, 13. Connecting hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0023] like Figures 1 to 5 As shown, an adjustable constant force magnetic spring precision positioning platform includes a first platform body 1, a second platform body 2, and a magnetic spring assembly. The magnetic spring assembly includes a fixed base 3, which is fixedly mounted on the second platform body 2. An outer magnet 9 is mounted on the fixed base 3, and an inner magnet 10 corresponding to the outer magnet 9 is mounted in a sleeve 4. An adjusting body is mounted on the first platform, and a support base is mounted on the second platform. One end of the sleeve 4 is connected to the support body 7, and the other end of the sleeve 4 is connected to the adjusting component 6. The rotation angle of the inner magnet 10 in the sleeve 4 is adjusted by the adjusting component 6.

[0024] like Figure 5 As shown in this application, the outer magnet 9 is a tile magnet, and the inner magnet 10 is a cylindrical magnet, which is located between the two tile magnets.

[0025] The sleeve 4 has a first end 5 and a second end 8 at its two ends. The first end 5 is connected to the adjusting member 6, and a bearing is provided on the support body 7. The second end 8 is connected to the bearing on the support body 7. The adjusting member 6 is used to control the locking or unlocking of the first end 5. When it is necessary to adjust the rotation angle of the inner magnet 10 inside the sleeve 4, the first end 5 is first unlocked by the adjusting member 6, so that the sleeve 4 can rotate around its own central axis. The operator changes the rotation angle of the inner magnet 10 by rotating the inner sleeve 4, thereby adjusting the fit between the inner magnet 10 and the outer magnet 9. When the inner magnet 10 is adjusted to the target angle position, the first end 5 is locked by the adjusting member 6 to fix the angle of the inner magnet 10.

[0026] Specifically, the adjusting body is provided with a clamping hole 11 and a locking screw hole 12. A locking screw is connected in the locking screw hole 12. The first end 5 is connected in the clamping hole 11. The locking screw is used to lock or loosen the first end 5.

[0027] The adjusting component 6 is provided with a connecting hole 13, and the adjusting component 6 is connected to the first platform body 1 by a connecting screw.

[0028] The fixing base 3 is provided with a through hole, and the outer magnet 9 is fixed on the inner wall of the through hole.

[0029] To facilitate the rotation of the sleeve 4, a torsion groove is provided on the first end 5. When adjusting the sleeve 4 by rotation, a wrench, screwdriver, etc. can be inserted into the torsion groove to assist in the rotation of the sleeve 4.

[0030] The principle of this utility model is as follows:

[0031] like Figure 5 As shown, the opposite magnetic poles of the inner magnet 10 and the outer magnet 9 attract each other, forming a magnetic field with magnetic field lines radiating from the N pole to the S pole. When a radially uniformly magnetized cylindrical magnet is located between them, it will be attracted by the opposite magnetic fields on both sides and repelled by the like magnetic fields. Without any other external force restraining it, the inner magnet 10 will be in a state of... Figure 5 The state shown; when the outer magnet 9 (tile magnet) is stationary and the cylindrical magnet rotates clockwise or counterclockwise under external force, because the magnetic field strength and direction of the outer magnet 9 remain unchanged, the effective magnetic flux of the cylindrical magnet decreases during rotation due to the cancellation of like-pole magnetic fields and the reduction of opposite-pole magnetic fields, thus reducing the attractive force of the outer magnet 9 on the cylindrical magnet. When the rotation angle α of the inner magnet 10 is equal to 0 (i.e., Figure 5 In the state shown, the cylindrical magnet experiences the greatest force. When the rotation angle α of the inner magnet 10 is equal to 180°, the attractive force on the inner magnet 10 is zero. The change in the magnitude of the magnetic force between the inner magnet 10 and the outer magnet 9 can adjust the axial thrust of the magnetic spring assembly.

[0032] Based on this principle, the present invention can control the magnitude of the magnetic spring thrust by changing the rotation angle α of the inner magnet 10, and the thrust can be adjusted from zero to the maximum thrust, with a large adjustment range.

[0033] Define the length of the outer magnet (tile magnet) as L1, the length of the inner magnet (cylindrical magnet) as L2, the absolute value of the difference between their lengths as L3, and the effective constant force range as L4.

[0034] The tile magnet remains stationary, and the cylindrical magnet and the tile magnet are aligned on the left side in the initial state. When the cylindrical magnet moves to the right, it will be subject to a constant axial attraction from the tile magnet until the left end face of the cylindrical magnet reaches or passes the right end face of the tile magnet. If the cylindrical magnet moves to the left, it will not be subject to the axial attraction from the tile magnet within the range of its travel before the right end face of the cylindrical magnet reaches the right end face of the tile magnet.

[0035] The effective constant force length range L4 = min(LI, L2), that is, the effective constant force length range is equal to the length of the shorter of the tile magnet or the cylindrical magnet.

[0036] The absolute value of the length difference between the two, L3, represents the range where no force is applied. When L1 = L2, that is, L3 = 0, the cylindrical magnet will be instantaneously attracted by the axial force of the tile magnet regardless of whether it moves to the left or right, and the direction of the force is opposite to the direction of movement of the cylindrical magnet.

[0037] Based on the above principles, the magnetic spring assembly of this utility model can achieve the effect of constant force adjustment, and the range of constant force stroke and the range of reverse force-free area can be controlled by controlling the lengths of L1 and L2; and the magnitude of the maximum thrust can be controlled by controlling the strength of the magnet or the size of the tile magnet and the cylindrical magnet.

[0038] In this utility model, a magnetic spring assembly is provided on each side of the first platform body 1 and the second platform body 2. If the adjusting member 6 does not hold the first end 5 tightly, the inner magnet can rotate under the action of external torque. The rotation angle of the inner magnet of the constant force magnetic spring can be adjusted by rotating the inner magnet with a wrench or other tools, so as to change the magnitude of the thrust of the magnetic spring assembly and thus balance the load of the platform. When the force balance is achieved, the adjusting member 6 can be locked to fix the rotation angle of the inner magnet.

[0039] When adjusting the thrust of the magnetic spring assembly, when the inner magnet of one side of the magnetic spring assembly rotates clockwise, the inner magnet of the other side of the magnetic spring assembly can rotate counterclockwise, thus counteracting the lateral pressure.

[0040] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. An adjustable constant force magnetic spring precision positioning platform, characterized in that, The device includes a first platform body, a second platform body, and a magnetic spring assembly. The magnetic spring assembly includes a fixed base, which is fixedly mounted on the second platform body. An outer magnet is mounted on the fixed base, and an inner magnet corresponding to the outer magnet is mounted in the sleeve. An adjusting body is mounted on the first platform, and a support base is mounted on the second platform. One end of the sleeve is connected to the support body, and the other end of the sleeve is connected to the adjusting body. The rotation angle of the inner magnet in the sleeve is adjusted by the adjusting body.

2. The adjustable constant force magnetic spring precision positioning platform according to claim 1, characterized in that, The outer magnet is a tile magnet, and the inner magnet is a cylindrical magnet, with the cylindrical magnet located between the two tile magnets.

3. The adjustable constant force magnetic spring precision positioning platform according to claim 1, characterized in that, The mounting base is provided with a through hole, and the external magnet is fixed to the inner wall of the through hole.

4. The adjustable constant force magnetic spring precision positioning platform according to claim 1, characterized in that, The sleeve has a first end and a second end at its two ends. The first end is connected to the adjusting component, and a bearing is provided on the support body. The second end is connected to the bearing on the support body.

5. The adjustable constant force magnetic spring precision positioning platform according to claim 4, characterized in that, The adjusting body is provided with a clamping hole and a locking screw hole. A locking screw is connected to the locking screw hole. The first end is connected to the clamping hole, and the locking screw is used to lock or loosen the first end.

6. The adjustable constant force magnetic spring precision positioning platform according to claim 5, characterized in that, The adjusting component is provided with a connecting hole, and the adjusting component is connected to the first platform body by a connecting screw.

7. The adjustable constant force magnetic spring precision positioning platform according to claim 1, characterized in that, A torsion groove is provided on the first end.

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