A separation device for a nuclear magnetic gradient coil

Abstract

The application discloses a kind of non-destructive physical separation devices of nuclear magnetic gradient coil.The device includes support frame, continuous band saw, sawing transmission system and adjustable driven roller frame assembly.By supporting frame bearing overall structure, continuous band saw is previously placed in the potting gap between inner and outer rings of gradient coil.Active roller frame and driven roller frame work together to drive large gradient coil to rotate smoothly at very low speed, while sawing transmission system drives band saw to run at high speed.In the precise coupling of bidirectional motion, the band saw continuously cuts the epoxy resin layer solidified between inner and outer rings in the circumferential direction.The application solves the industry problem that the overall potting gradient coil is difficult to disassemble, realizes the non-destructive peeling of inner and outer layers of coil, significantly reduces the maintenance cost of nuclear magnetic resonance equipment, and has very high engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of MRI hardware maintenance technology, and specifically relates to a separation device for nuclear magnetic gradient coils. Background Technology

[0002] Magnetic resonance imaging (MRI) equipment is the core equipment for modern medical imaging diagnosis, and gradient coils are the key components for spatial localization in MRI systems. During an MRI scan, the main magnet generates a constant and uniform main magnetic field B0. The role of the gradient coils is to superimpose a weak, controllable, and linearly varying additional magnetic field onto the main magnetic field. By changing the proton resonance frequency at different spatial locations, tomographic imaging and precise spatial localization of human tissues can be achieved.

[0003] Gradient coils operate under high current and high frequency switching conditions for extended periods. According to Joule's law and the principles of mechanical vibration, this high-intensity electrical load generates a significant amount of heat. To maintain normal operation and prevent coil burnout, gradient coils typically integrate water-cooling piping, using circulating coolant to dissipate the heat.

[0004] Because gradient coils operate under alternating high and low temperatures, electromagnetic vibrations, and high-voltage currents for extended periods, the coil materials and cooling pipes are highly susceptible to aging. Aging pipes often lead to coolant leakage or blockage, which in turn triggers coil overheating alarms, insulation breakdown, or even complete burnout.

[0005] In current repair techniques, gradient coils are generally encapsulated using a monolithic epoxy resin vacuum potting process, where the inner and outer coil layers (i.e., the field-generating coil layer and the shielding layer) are cured into a single, tightly packed cylindrical structure. This "integrated" structure leads to the following technical bottlenecks: High maintenance costs: When internal pipes or a single layer of coils malfunction, since they cannot be disassembled, the only solution is usually to scrap and replace the entire coil, resulting in a huge waste of resources and high maintenance costs.

[0006] Difficult to separate: Epoxy resin has extremely high hardness and chemical stability. Conventional mechanical cutting or physical disassembly can easily damage the geometric precision of the internal windings, rendering the coil unrepairable.

[0007] Therefore, how to achieve non-destructive separation of the inner and outer coils of the gradient coil in order to accurately repair the internal water-cooling pipeline or burned parts is a key technical problem that urgently needs to be solved in the field of MRI hardware maintenance.

[0008] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide a separation device for nuclear magnetic gradient coils, thereby solving the above-mentioned technical problems.

[0010] To achieve the above objectives, the present invention provides a separation device for nuclear magnetic gradient coils, comprising a support frame, a band saw, a band saw transmission assembly, a driving roller frame assembly, and a driven roller frame assembly. The support frame is equipped with the band saw transmission assembly, the driving roller frame assembly, and the driven roller frame assembly. The band saw is mounted on the band saw transmission assembly and passes between the inner and outer coils of the gradient coil. The driving roller frame assembly and the driven roller frame assembly support and drive the gradient coil to rotate. The band saw transmission assembly includes a driving wheel, a driven wheel, and a driving wheel servo motor. The driving wheel and the driven wheel are respectively located at both ends of the support frame and on both sides of the gradient coil. The driving wheel servo motor is connected to the driving wheel, and the band saw is fitted between the driving wheel and the driven wheel. The driving roller frame assembly includes a driving roller, a driving roller frame, and a driving roller drive motor. The structure comprises an active roller frame mounted on a support frame, on which are mounted active rollers and an active roller drive mechanism. The active rollers on the active roller frame form an active roller group, with the top of the active roller group having a concave arc-shaped structure that mates with the gradient coil structure. The active roller drive mechanism is connected to the active roller in the middle of the active roller group. The driven roller frame assembly includes a driven roller and a driven roller frame, mounted on the support frame. The driven rollers on the driven roller frame form a driven roller group, with the top of the driven roller group having a concave arc-shaped structure that is flush with the arc-shaped structure of the active roller group. The gradient coil is driven to rotate by the active roller group and the driven roller group, and the band saw is driven to rotate by the band saw drive assembly. During the rotation of the gradient coil, the rotating band saw cuts and separates the inner and outer rings of the gradient coil.

[0011] Preferably, in the technical solution, the band saw transmission assembly includes a drive wheel, a driven wheel, a drive wheel servo motor, a drive wheel seat, a driven wheel seat, a reduction wheel, and a transmission belt. The drive wheel seat and the driven wheel seat are respectively located at both ends of the support frame. The drive wheel servo motor is located on one side of the support frame of the drive wheel seat. Reduction wheels are respectively located on the drive wheel seat and the driven wheel seat. The drive wheel and the driven wheel are respectively mounted on their respective reduction wheels. The output end of the drive wheel servo motor is connected to the reduction wheel on the drive wheel seat via a transmission belt. The drive wheel and the driven wheel are connected by the band saw. The speed of the drive wheel servo motor is 700-1200 r / min. The drive wheel servo motor drives the drive wheel and the driven wheel to rotate, and the drive wheel and the driven wheel drive the band saw to rotate.

[0012] Preferably, in the technical solution, the band saw transmission assembly further includes a tensioning mechanism, with corresponding tensioning mechanisms respectively provided on the drive wheel seat and the driven wheel seat; the tensioning mechanism includes a threaded rod, a compression spring, a pressure block, a slider, and a slide groove, wherein the threaded rod, compression spring, and pressure block form a clamping mechanism, the slide groove is provided on the corresponding drive wheel seat and the driven wheel seat, the slider is provided in the slide groove, the slider is connected to the corresponding reduction wheel, and clamping mechanisms are symmetrically provided on both sides of the slider; the threaded rod is provided on the corresponding drive wheel seat and the driven wheel seat, both ends of the compression spring are connected to the pressure block, the threaded rod is connected to the pressure block at one end of the compression spring, and the pressure block at the other end of the compression spring contacts the slider; by the threaded rod squeezing the compression spring, the pressure block pushes the slider to move axially in the slide groove, adjusting the axial position of the slider, thereby adjusting the axial position of the drive wheel and the driven wheel, and tensioning the band saw.

[0013] Preferably, in the technical solution, the active roller frame assembly includes an active roller, an active roller frame, an active roller servo motor, and a reducer. The active roller frame is mounted on a support frame, and an arc-shaped groove is provided on the top of the active roller frame. The active roller includes a large roller and a transmission roller. The large rollers are evenly arranged along the arc-shaped groove, and transmission rollers are arranged between the large rollers. The large rollers and transmission rollers form an active roller group. The arc at the top of the large rollers matches the gradient coil structure. The active roller frame is equipped with an active roller servo motor and a reducer. The active roller servo motor and the reducer form an active roller drive mechanism. The active roller servo motor is connected to the reducer, and the reducer is connected to the transmission roller located at the center. The speed of the active roller servo motor is 10 r / h. The active roller servo motor and the reducer drive the transmission roller to rotate, which in turn drives the large roller to rotate. The rotation of the active roller group drives the gradient coil to rotate.

[0014] Preferably, in the technical solution, the active roller frame assembly further includes a tension adjustment mechanism, which includes a bearing seat and a lifting rod. The lifting rod is mounted on the active roller frame, and both ends of the transmission roller are fixed on the bearing seat. The bearing seat is threadedly connected to the lifting rod. The height of the transmission roller is adjusted by the lifting rod, thereby adjusting the tightness of the contact between the transmission roller and the large roller.

[0015] Preferably, in the technical solution, the driven roller frame assembly includes a driven roller and a driven roller frame. The driven roller frame is mounted on a support frame. An arc-shaped groove is provided on the top of the driven roller frame. The driven rollers are evenly arranged along the arc-shaped groove. The driven rollers in the arc-shaped groove form a driven roller group. The arc at the top of the driven roller matches the gradient coil structure.

[0016] Preferably, in the technical solution, the active roller frame and the driven roller frame are movably mounted on the support frame to accommodate the maintenance needs of gradient coils of different sizes.

[0017] A separation method for a nuclear magnetic gradient coil separation device, comprising the following steps: (1) adjusting the positions of the active roller frame assembly and the driven roller frame assembly on the support frame according to the size of the gradient coil, setting the speed of the active wheel servo motor and the speed of the active roller servo motor, and setting the height of the transmission roller; (2) The gradient coil is hoisted and placed on the active roller frame assembly and the driven roller frame assembly, and the gradient coil is supported by the active roller and the driven roller; (3) Pass one end of the band saw through the interlayer gap between the inner and outer rings of the gradient coil, mount the band saw on the driving wheel and the driven wheel, weld the two ends of the band saw, rotate the threaded rod, adjust the axial position of the driving wheel and the driven wheel, and tension the band saw. (4) Start the drive wheel servo motor. The speed of the drive wheel servo motor is 700-1200 r / min. The drive wheel servo motor drives the drive wheel to rotate after being reduced by the reduction wheel. The drive wheel and the driven wheel drive the band saw to rotate. At the same time, start the drive roller servo motor. The speed of the drive roller servo motor is 10 r / h. The drive roller servo motor drives the large roller to rotate through the transmission roller. The drive roller and the driven roller drive the gradient coil to rotate at a speed of 8-15 mm / h. (5) During the rotation of the gradient coil, the band saw rotating between the inner and outer rings cuts and separates the inner and outer rings until the inner and outer rings of the gradient coil are completely separated.

[0018] Compared with the prior art, the present invention has the following beneficial effects: A dual-servo system is formed by the active wheel servo motor and the active roller servo motor to precisely control the speed of the band saw and the gradient coil. The high-speed band saw performs cutting, while the coil rotates at a very low speed to provide feed. By precisely controlling the cutting parameters, the epoxy resin layer between the inner and outer coils is accurately separated, and the electrical performance and physical structure of the inner and outer coils are completely preserved, avoiding the situation where the entire gradient coil is scrapped. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the separation device for the nuclear magnetic gradient coil of the present invention; Figure 2 This is a front view of the separation device for the nuclear magnetic gradient coil of the present invention; Figure 3 This is a left view of the separation device for the nuclear magnetic gradient coil of the present invention; Figure 4 This is a top view of the separation device for the nuclear magnetic gradient coil of the present invention; Figure 5 This is a schematic diagram of the band saw transmission assembly structure of the present invention; Figure 6 This is a schematic diagram of the tensioning mechanism of the present invention; Figure 7 This is a schematic diagram of the active roller frame assembly structure of the present invention; Figure 8 This is a schematic diagram of the driven roller frame assembly of the present invention. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0021] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0022] like Figure 1-4 As shown, a separation device for a nuclear magnetic resonance gradient coil includes a support frame 1, a band saw 2, a band saw drive assembly 3, a driving roller frame assembly 4, and a driven roller frame assembly 5. The support frame 1 is equipped with the band saw drive assembly 3, the driving roller frame assembly 4, and the driven roller frame assembly 5. The band saw 2 is mounted on the band saw drive assembly 3 and passes between the inner coil 61 and the outer coil 62 of the gradient coil 6. The driving roller frame assembly 4 and the driven roller frame assembly 5 support and drive the gradient coil 6 to rotate. The band saw 2 is driven to rotate by the band saw drive assembly 3, and during the rotation of the gradient coil 6, the rotating band saw 2 cuts and separates the inner coil 61 and the outer coil 62. The driving roller frame and the driven roller frame are movably mounted on the support frame to accommodate gradient coils of different sizes for maintenance.

[0023] like Figure 5 As shown, the band saw transmission assembly 3 includes a drive wheel 31, a driven wheel 32, a drive wheel servo motor 33, a drive wheel seat 34, a driven wheel seat 35, a reduction wheel 36, a transmission belt 37, and a tensioning mechanism 38. The drive wheel seat 34 and the driven wheel seat 35 are respectively mounted at both ends of the support frame 1. The drive wheel servo motor 33 is mounted on the support frame 1 on one side of the drive wheel seat 34. The reduction wheels 36 are respectively mounted on the drive wheel seat 34 and the driven wheel seat 35. The drive wheel 31 and the driven wheel 32 are respectively mounted on the corresponding reduction wheels 36. The reduction wheels 36 are straight. The diameter is smaller than that of the driving wheel 31 and the driven wheel 32. The driving wheel 31 and the driven wheel 32 are located on both sides of the gradient coil 6. The output end of the driving wheel servo motor 33 is connected to the reduction wheel 36 on the driving wheel seat 34 through the transmission belt 37. The driving wheel 31 and the driven wheel 32 are connected through the band saw 2. The speed of the driving wheel servo motor 33 is 700-1200 r / min. After being reduced by the reduction wheel 36, the driving wheel servo motor 33 drives the driving wheel 31 and the driven wheel 32 to rotate. The driving wheel 31 and the driven wheel 32 drive the band saw 2 to rotate. like Figure 6As shown, corresponding tensioning mechanisms 38 are respectively provided on the driving wheel seat 34 and the driven wheel seat 35. The tensioning mechanism 38 includes a threaded rod 381, a compression spring 382, ​​a pressure block 383, a slider 384, and a sliding groove (not shown). The threaded rod 381, compression spring 382, ​​and pressure block 383 form a clamping mechanism. The sliding groove is provided on the corresponding driving wheel seat 34 and the driven wheel seat 35. The slider 384 is provided in the sliding groove and is connected to the corresponding reduction wheel 36. Clamping mechanisms are symmetrically arranged on both sides of the slider 384. The structure includes a threaded rod 381 mounted on the corresponding drive wheel seat 34 and driven wheel seat 35. The two ends of the compression spring 382 are connected to the pressure block 383. The threaded rod 381 is connected to the pressure block 383 at one end of the compression spring 382, ​​and the pressure block 383 at the other end of the compression spring 382 contacts the slider 384. By pressing the compression spring 382 with the threaded rod 381, the pressure block 383 pushes the slider 384 to move axially in the groove, adjusting the axial position of the slider 384, thereby adjusting the axial positions of the drive wheel 31 and driven wheel 32, and tensioning the band saw 2.

[0024] like Figure 7 As shown, the active roller frame assembly 4 includes an active roller 41, an active roller frame 42, an active roller servo motor 43, a reducer 44, and a tension adjustment mechanism 45. The active roller frame 42 is mounted on the support frame 1, and an arc-shaped groove 46 is provided on the top of the active roller frame 42. The active roller 41 includes a large roller 411 and a transmission roller 412. The large rollers 411 are evenly arranged along the arc-shaped groove 46, and the transmission rollers 412 are arranged between the large rollers 411. The large rollers 411 and the transmission rollers 412 form an active roller group. The top arc of 11 matches the structure of gradient coil 6; an active roller servo motor 43 and a reducer 44 are installed on the active roller frame 42. The active roller servo motor 43 and the reducer 44 form an active roller drive mechanism. The active roller servo motor 43 is connected to the reducer 44, and the reducer 44 is connected to the transmission roller 412 located in the center; the speed of the active roller servo motor 43 is 10 r / h; the active roller servo motor 43 and the reducer 44 drive the transmission roller 412 to rotate, which in turn drives the large roller 411 to rotate; The tension adjustment mechanism 45 includes a bearing seat 451 and a lifting rod 452. The lifting rod 452 is mounted on the active roller frame 42. The two ends of the transmission roller 412 are fixed on the bearing seat 451. The bearing seat 451 is threadedly connected to the lifting rod 452. The height of the transmission roller 412 is adjusted by the lifting rod 452, thereby adjusting the tightness of the contact between the transmission roller 412 and the large roller 411.

[0025] like Figure 8As shown, the driven roller frame assembly 5 includes a driven roller 51 and a driven roller frame 52. The driven roller frame 52 is mounted on the support frame 1. An arc-shaped groove 53 is provided on the top of the driven roller frame 52. The driven rollers 51 are evenly arranged along the arc-shaped groove 52. The driven rollers 51 in the arc-shaped groove 52 form a driven roller group. The arc at the top of the driven roller 51 matches the structure of the gradient coil 6. The arc at the top of the driven roller 51 is flush with the arc at the top of the large roller 411. The gradient coil 6 is driven to rotate through the active roller group and the driven roller group.

[0026] A separation method for a nuclear magnetic gradient coil separation device, the steps of which are: (1) Adjusting the position of the active roller frame assembly 4 and the driven roller frame assembly 5 on the support frame 1 according to the size of the gradient coil 6, setting the speed of the active wheel servo motor 33 and the speed of the active roller servo motor 43, and setting the height of the transmission roller 412. (2) The gradient coil 6 is hoisted and placed on the active roller frame assembly 4 and the driven roller frame assembly 5. The gradient coil 6 is supported by the active roller 41 and the driven roller 51. (3) Pass one end of the band saw 2 through the interlayer gap between the inner ring 61 and the outer ring 62 of the gradient coil 6, mount the band saw 2 on the driving wheel 31 and the driven wheel 32, weld the two ends of the band saw 2, rotate the threaded rod 381, adjust the axial position of the driving wheel 31 and the driven wheel 32, and tension the band saw 2. (4) Start the active wheel servo motor 33. The speed of the active wheel servo motor 33 is 700-1200 r / min. After the active wheel servo motor 33 is reduced by the reduction wheel 36, it drives the active wheel 31 to rotate. The active wheel 31 and the driven wheel 32 drive the band saw 2 to rotate. At the same time, start the active roller servo motor 43. The speed of the active roller servo motor 43 is 10 r / h. The active roller servo motor 43 drives the large roller 411 to rotate through the transmission roller 412. The active roller 41 and the driven roller 51 drive the gradient coil 6 to rotate at a speed of 8-15 mm / h. (5) During the rotation of the gradient coil 6, the band saw 2 rotating between the inner ring 61 and the outer ring 62 cuts and separates the inner ring 61 and the outer ring 62 until the inner ring 61 and the outer ring 62 of the gradient coil 6 are completely separated.

[0027] The rotation speed of the band saw 2 and the gradient coil 6 is precisely controlled by the drive wheel servo motor 33 and the drive roller servo motor 43. During the slow rotation of the gradient coil 6, the band saw 2 separates the inner ring 61 and the outer ring 62 little by little, ensuring that the inner ring 61 and the outer ring 62 are not damaged, thus avoiding the situation where the gradient coil 6 is scrapped as a whole.

[0028] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A separation device for nuclear magnetic gradient coils, characterized in that: The system includes a support frame, a band saw, a band saw transmission assembly, a drive roller frame assembly, and a driven roller frame assembly. The support frame houses the band saw transmission assembly, drive roller frame assembly, and driven roller frame assembly. The band saw is mounted on the band saw transmission assembly and passes between the inner and outer coils of the gradient coil. The drive roller frame assembly and driven roller frame assembly support and drive the gradient coil to rotate. The band saw transmission assembly includes a drive wheel, a driven wheel, and a drive wheel servo motor. The drive wheel and driven wheel are respectively located at both ends of the support frame and on both sides of the gradient coil. The drive wheel servo motor is connected to the drive wheel for transmission. The band saw is fitted between the drive wheel and the driven wheel. The drive roller frame... The assembly includes a drive roller, a drive roller frame, and a drive roller mechanism. The drive roller frame is mounted on a support frame, and the drive roller and drive mechanism are mounted on the drive roller frame. The drive rollers on the drive roller frame form a drive roller group. The top of the drive roller group has a concave arc-shaped structure, which cooperates with the gradient coil structure. The drive roller mechanism is connected to the drive roller in the middle of the drive roller group. The driven roller frame assembly includes a driven roller and a driven roller frame. The driven roller frame is mounted on a support frame, and the driven rollers on the driven roller frame form a driven roller group. The top of the driven roller group has a concave arc-shaped structure, and the arc-shaped structure of the driven roller group is flush with the arc-shaped structure of the drive roller group.

2. The separation device for nuclear magnetic gradient coils according to claim 1, characterized in that: The band saw transmission assembly includes a drive wheel, a driven wheel, a drive wheel servo motor, a drive wheel seat, a driven wheel seat, a reduction wheel, and a transmission belt. The drive wheel seat and the driven wheel seat are respectively located at both ends of the support frame. The drive wheel servo motor is mounted on the support frame on one side of the drive wheel seat. Reduction wheels are respectively mounted on the drive wheel seat and the driven wheel seat. The drive wheel and the driven wheel are respectively mounted on their corresponding reduction wheels. The output end of the drive wheel servo motor is connected to the reduction wheel on the drive wheel seat via the transmission belt. The drive wheel and the driven wheel are connected by the band saw. The speed of the drive wheel servo motor is 700-1200 r / min. The drive wheel servo motor drives the drive wheel and the driven wheel to rotate, and the drive wheel and the driven wheel drive the band saw to rotate.

3. The separation device for nuclear magnetic gradient coils according to claim 2, characterized in that: The band saw transmission assembly also includes a tensioning mechanism. Corresponding tensioning mechanisms are respectively installed on the drive wheel seat and the driven wheel seat. The tensioning mechanism includes a threaded rod, a compression spring, a pressure block, a slider, and a sliding groove. The threaded rod, compression spring, and pressure block form a clamping mechanism. The sliding groove is installed on the corresponding drive wheel seat and the driven wheel seat. The slider is installed in the sliding groove and connected to the corresponding reduction wheel. A clamping mechanism is symmetrically installed on both sides of the slider. The threaded rod is installed on the corresponding drive wheel seat and the driven wheel seat. Both ends of the compression spring are connected to the pressure block. The threaded rod is connected to the pressure block at one end of the compression spring, and the pressure block at the other end of the compression spring contacts the slider.

4. The separation device for nuclear magnetic gradient coils according to claim 1, characterized in that: The active roller frame assembly includes an active roller, an active roller frame, an active roller servo motor, and a reducer. The active roller frame is mounted on a support frame, and an arc-shaped groove is provided on the top of the active roller frame. The active roller includes a large roller and a drive roller. The large rollers are evenly arranged along the arc-shaped groove, and drive rollers are arranged between the large rollers. The large rollers and drive rollers form an active roller group. The arc at the top of the large rollers matches the gradient coil structure. The active roller frame is equipped with an active roller servo motor and a reducer. The active roller servo motor and reducer form an active roller drive mechanism. The active roller servo motor is connected to the reducer, and the reducer is connected to the drive roller located at the center. The speed of the active roller servo motor is 10 r / h. The active roller servo motor and reducer drive the drive roller to rotate, which in turn drives the large roller to rotate. The rotation of the active roller group drives the gradient coil to rotate.

5. The separation device for nuclear magnetic gradient coils according to claim 4, characterized in that: The active roller frame assembly also includes a tension adjustment mechanism, which includes a bearing housing and a lifting rod. The lifting rod is mounted on the active roller frame, and both ends of the drive roller are fixed to the bearing housing. The bearing housing and the lifting rod are threadedly connected.

6. The separation device for nuclear magnetic gradient coils according to claim 1, characterized in that: The driven roller frame assembly includes a driven roller and a driven roller frame. The driven roller frame is mounted on a support frame. An arc-shaped groove is provided on the top of the driven roller frame. The driven rollers are evenly arranged along the arc-shaped groove. The driven rollers in the arc-shaped groove form a driven roller group. The arc at the top of the driven roller matches the gradient coil structure.

7. The separation device for nuclear magnetic gradient coils according to claim 1, characterized in that: The active roller frame and the driven roller frame are movably mounted on the support frame.

8. A separation method for a separation device for nuclear magnetic gradient coils according to any one of claims 1-7, comprising the following steps: (1) adjusting the positions of the active roller frame assembly and the driven roller frame assembly on the support frame according to the size of the gradient coil, setting the rotation speed of the active wheel servo motor and the rotation speed of the active roller servo motor, and setting the height of the transmission roller; (2) The gradient coil is hoisted and placed on the active roller frame assembly and the driven roller frame assembly, and the gradient coil is supported by the active roller and the driven roller; (3) Pass one end of the band saw through the interlayer gap between the inner and outer rings of the gradient coil, mount the band saw on the driving wheel and the driven wheel, weld the two ends of the band saw, rotate the threaded rod, adjust the axial position of the driving wheel and the driven wheel, and tension the band saw. (4) Start the drive wheel servo motor. The speed of the drive wheel servo motor is 700-1200 r / min. The drive wheel servo motor drives the drive wheel to rotate after being reduced by the reduction wheel. The drive wheel and the driven wheel drive the band saw to rotate. At the same time, start the drive roller servo motor. The speed of the drive roller servo motor is 10 r / h. The drive roller servo motor drives the large roller to rotate through the transmission roller. The drive roller and the driven roller drive the gradient coil to rotate at a speed of 8-15 mm / h. (5) During the rotation of the gradient coil, the band saw rotating between the inner and outer rings cuts and separates the inner and outer rings until the inner and outer rings of the gradient coil are completely separated.

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