Particle beam extraction device, release film adjustment method, and cyclotron

Abstract

The application discloses a kind of particle beam leading-out device, stripping film adjusting method and cyclotron, it is related to cyclotron field, comprising: driving motor, magnetic fluid sealing device, flange, right-angle transmission mechanism connected in turn;The driving motor is fixed to the front end of flange by motor mounting bracket;The input end of the magnetic fluid sealing device is connected with the output shaft of driving motor, and the output end of the magnetic fluid sealing device penetrates flange, support and is connected to right-angle transmission mechanism.The right-angle transmission mechanism connected to driving motor and two stripping film structures is set in the application, so that the angle of two stripping film structures can be adjusted or position switching, the right-angle transmission mechanism is realized by base, first spindle, second spindle, using the structure mode of hinge and connecting rod to realize movement direction conversion, can effectively avoid the vibration and noise generated by gear meshing, greatly reduce wear and tear by the structure, so that the maintenance frequency of equipment is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of cyclotrons, and particularly to a particle beam extraction device, a stripping film adjustment method, and a cyclotron. Background Technology

[0002] Cyclotrons, as important particle acceleration devices, have wide applications in medical and scientific research fields such as radioactive isotope production and cancer treatment. Their basic working principle involves repeatedly accelerating charged particles using a high-frequency electric field while simultaneously confining them along a helical trajectory using a strong magnetic field. When the particle energy reaches a predetermined value, it is extracted from the acceleration trajectory through a "stripping extraction" method: a high-energy particle beam bombards an extremely thin stripping film, changing the particle's charge state through charge exchange. Subsequently, its trajectory in the magnetic field is deflected, thus guiding it to the target system.

[0003] Existing medical cyclotron accelerators typically employ a large, circular magnet structure, with accelerated particles moving tangentially along their radius. A vacuum enclosure is mounted around the magnet, but the mounting flange for the extraction device can only be connected to the axial vertical plane of this enclosure. Therefore, a transmission mechanism is required to adjust the angle of the release membrane.

[0004] In this process, the relative angle between the stripping membrane surface and the incident particle beam is a crucial parameter. This angle directly affects the efficiency of charge exchange, the quality of the extracted beam, and the uniformity of bombardment of the stripping membrane itself, thus affecting its service life. Therefore, in actual operation, it is necessary to be able to precisely adjust and align the angle of the stripping membrane.

[0005] In existing technologies, transmission mechanisms for adjusting the peeling membrane angle mostly rely on bevel gear sets to achieve angular direction adjustment. For example, Chinese invention patent publication number CN117979528A, "An Inner and Outer Dual-Rod Peeling Target for a Compact Cyclotron," discloses a scheme that uses bevel gears to transmit the rotation of the horizontal axis to the vertical axis, thereby driving the diaphragm to oscillate. However, this type of bevel gear transmission mechanism has inherent drawbacks: First, the design and manufacturing process of bevel gears is complex, requiring extremely high precision in tooth profile and assembly alignment, resulting in high processing costs; second, vibration and noise are inevitably generated during gear meshing, which is particularly prominent in precision experimental environments; third, the tooth surface will wear after long-term use, requiring regular maintenance and replacement, increasing equipment downtime and maintenance costs. For this application scenario, only low-speed, low-torque intermittent angle adjustment is required, and using complex bevel gear transmissions would lead to excessive resource consumption.

[0006] On the other hand, the stripping membrane itself is a consumable part, which will gradually be damaged, its performance degraded, and eventually fail under continuous bombardment by high-intensity particle beams. Traditional single-membrane designs mean that once the membrane fails, the accelerator operation must be interrupted, the internal high vacuum state must be broken, and personnel must enter to replace it after the radiation dose decreases. This process is not only time-consuming and greatly reduces equipment utilization, but also exposes maintenance personnel to the risk of ionizing radiation. Although there are some designs that use spare membranes, such as the Chinese invention patent authorization announcement number CN106961781A, their membrane switching mechanism is often independent of the angle adjustment mechanism, resulting in a complex and less compact overall structure, or the transmission scheme still does not break out of the scope of traditional gear transmission.

[0007] Existing cyclotron stripping extraction devices suffer from drawbacks such as high cost, high noise, and frequent maintenance in their transmission mechanisms. Furthermore, they lack a solution that efficiently and compactly integrates precise angle adjustment and rapid standby membrane switching. In terms of operation and maintenance, the cumbersome membrane replacement process negatively impacts overall operational efficiency and safety. Therefore, a novel particle beam extraction device is urgently needed to overcome these shortcomings. Summary of the Invention

[0008] In order to overcome the above-mentioned defects of the prior art, the present invention provides a particle beam extraction device to solve the problems existing in the background art.

[0009] The present invention provides the following technical solution: a particle beam extraction device, comprising: a drive motor, a magnetohydrodynamic sealing device, a flange, and a right-angle transmission mechanism connected in sequence;

[0010] The drive motor is fixed to the front end of the flange via a motor mounting bracket.

[0011] The magnetic fluid sealing device is installed inside the flange and motor mounting bracket. The input end of the magnetic fluid sealing device is connected to the output shaft of the drive motor, and the output end of the magnetic fluid sealing device passes through the flange and is connected to the right-angle transmission mechanism.

[0012] The right-angle transmission mechanism is mounted on the rear end of the flange via a bracket, and the input end of the right-angle transmission mechanism is connected to the output end of the magnetohydrodynamic sealing device; two peeling film structures are also provided on the output shaft of the right-angle transmission mechanism.

[0013] The right-angle transmission mechanism includes a base, a first main shaft, a second main shaft, and a motion conversion component. The base is mounted on the rear end of the flange via a bracket. The first and second main shafts are detachably mounted on both ends of the base, and their axes form a perpendicular relationship in space. One end of the first main shaft is connected to the output end of the magnetohydrodynamic sealing device. Two peeling film structures are mounted perpendicularly to one end of the second main shaft. The motion conversion component is connected between the first and second main shafts and is used to convert the transverse rotational motion of the first main shaft into the longitudinal rotational motion of the second main shaft to drive the two peeling film structures to adjust their angle and / or switch.

[0014] Preferably, the motion conversion component includes two rotating parts and a Z-shaped rotating arm. One end of each of the two rotating parts is rotatably connected to both ends of the Z-shaped rotating arm, and the other ends of each of the two rotating parts are respectively hinged to the first spindle and the second spindle via pins.

[0015] Preferably, the base includes a back plate and a first mounting block and a second mounting block disposed at both ends of the back plate. The first mounting block is fixedly mounted on the bracket, and the back plate is fixedly mounted on the back of the first mounting block. The back plate is inclined. The second mounting block is disposed at the end of the back plate and located diagonally above the first mounting block. The first main shaft is laterally rotatably assembled in the middle of the first mounting block, and the second main shaft is longitudinally rotatably assembled in the middle of the second mounting block, so that the axes of the first main shaft and the second main shaft are in a skew perpendicular relationship in space.

[0016] Preferably, the flange includes a first flange and a second flange. The first flange is used to connect and assemble the magnetohydrodynamic sealing device. The second flange has an I-shaped cross-section, one side of which is connected and assembled with the first flange, and the other side is used to assemble the cyclotron equipment. One end of the bracket passes through the interior of the second flange and is assembled on the other side of the first flange. Sealing rings are provided between the first flange, the second flange, and the magnetohydrodynamic sealing device.

[0017] Preferably, couplings are provided at the shaft connection between the drive motor and the magnetohydrodynamic sealing device, and at the shaft connection between the magnetohydrodynamic sealing device and the first main shaft.

[0018] Preferably, it also includes a peeling film holder disposed on the second main shaft. The peeling film holder has an L-shaped structure when viewed from above. The two end faces of the peeling film holder are provided with slots, and the two peeling film structures are respectively assembled in the slots of the peeling film holder to form a vertical relationship.

[0019] Preferably, the peeling film structure includes an outer frame, an inner frame, and a peeling film. Both the outer frame and the inner frame are U-shaped. The outer frame is detachably assembled to the end face of the peeling film holder, the inner frame is snapped onto the inner wall of the outer frame, and the peeling film is disposed inside the inner frame.

[0020] Preferably, both the first flange and the bracket are provided with through holes for the output end of the magnetohydrodynamic sealing device to pass through.

[0021] A method for conditioning a peeling membrane includes the following two modes:

[0022] Angle fine-tuning mode: Control the drive motor to rotate at a small angle, and drive the peeling film structure to adjust the angle within a small range through the right angle transmission mechanism so that the contact angle between the peeling film and the particle beam corresponds;

[0023] Backup membrane switching mode: Control the drive motor to rotate at a large angle, and drive the two peeling membrane structures to exchange positions through the right angle transmission mechanism until the backup peeling membrane is moved to the current peeling membrane position.

[0024] A cyclotron includes a particle beam extraction device.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. This invention connects the drive motor and two peeling film structures through a right-angle transmission mechanism, allowing the two peeling film structures to be angled or switched. This right-angle transmission mechanism is a non-gear type right-angle transmission mechanism composed of a base, a first main shaft, a second main shaft, and a motion conversion component, replacing the traditional bevel gear transmission method. It uses a hinge and connecting rod structure to realize the conversion of motion direction, which not only reduces the processing and assembly cost of components, but also effectively avoids the vibration and noise generated by gear meshing. In addition, the hinge and connecting rod structure greatly reduces wear and tear, thereby significantly reducing the number of equipment maintenance.

[0027] 2. This invention integrates two major functions—precise angle adjustment and rapid switching of the spare membrane—into a single right-angle transmission mechanism. By controlling the drive motor to rotate at different amplitudes, this mechanism can drive the second main shaft and the peeling membrane structure to achieve precise angle adjustment within a small range, and can also drive them to rotate at large angles, thereby enabling the interchange of the positions of the two vertically arranged peeling membrane structures. This avoids the complexity of setting up two independent drive systems for the two functions, making the overall device structure effectively compact and suitable for installation and use in the vacuum chamber interface of a medical cyclotron accelerator with low speed, low torque, intermittent operation and limited space.

[0028] 3. This invention introduces a magnetic fluid sealing device and an O-ring seal at the flange connection to form a dynamic and static dual sealing system, ensuring the reliability of the vacuum level in the vacuum chamber during the rotation adjustment of the drive shaft. At the same time, the design of a dual peeling membrane structure, combined with a quick switching function, allows the backup membrane to be activated remotely and automatically without disrupting the vacuum or requiring personnel intervention when the working membrane fails. This extends the continuous operation cycle of the system and reduces downtime caused by replacing the peeling membrane from several hours to minutes, improving the equipment utilization and production efficiency of the cyclotron. Meanwhile, it completely avoids the risk of radiation exposure to maintenance personnel, resulting in outstanding safety benefits.

[0029] 4. The peeling membrane structure of this invention adopts a modular design of outer frame and inner frame, which is snapped onto the peeling membrane frame, making the replacement of a single peeling membrane simple and quick. In addition, all components of the transmission mechanism are detachable, which facilitates later inspection and maintenance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall extraction device of the present invention.

[0031] Figure 2 This is a schematic diagram of the explosion of the extraction device of the present invention.

[0032] Figure 3 This is a schematic diagram of the right-angle transmission mechanism and the peeling film of the present invention.

[0033] Figure 4 This is a schematic diagram of the right-angle transmission mechanism of the present invention.

[0034] Figure 5 This is a partial cross-sectional schematic diagram of the extraction device of the present invention.

[0035] Figure 6 This is a schematic diagram of the base of the present invention.

[0036] Figure 7 This is a schematic diagram of the peeling film structure of the present invention.

[0037] Figure 8 This is a schematic diagram of the peeling membrane structure switching of the present invention.

[0038] The attached figures are labeled as follows: 1. Drive motor; 2. Magnetohydrodynamic sealing device; 3. Flange; 31. First flange; 32. Second flange; 4. Right-angle transmission mechanism; 41. Base; 411. First mounting block; 412. Back plate; 413. Second mounting block; 42. First spindle; 43. Second spindle; 44. Motion conversion component; 441. Rotating component; 442. Z-shaped swing arm; 443. Pin; 5. Peeling film structure; 51. Outer frame; 52. Inner frame; 53. Peeling film; 6. Motor mounting bracket; 7. Bracket; 8. Coupling; 9. Peeling film frame. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0040] This invention provides a particle beam extraction device, such as... Figure 1-8 As shown, it includes: a drive motor 1, a magnetohydrodynamic sealing device 2, a flange 3, and a right-angle transmission mechanism 4 connected in sequence. The device is a single module, sealed and fixed to the side wall interface of the cyclotron vacuum chamber through the mounting surface of its flange 3.

[0041] The drive motor 1 serves as the driving source, preferably a stepper motor or a servo motor, to achieve precise angle control. The drive motor 1 is fixed to the outermost side of the device via the motor mounting bracket 6. Power is transmitted into the interior through the vacuum interface, achieved through the magnetohydrodynamic sealing device 2. The magnetohydrodynamic sealing device 2 typically comprises a stationary pole shoe assembly and a rotating drive shaft, the interior of which is filled with magnetohydrodynamic fluid.

[0042] Flange 3 includes a first flange 31 for connecting the assembly drive motor 1 and the magnetohydrodynamic sealing device 2, and a second flange 32 for connecting to the side wall interface of the cyclotron vacuum chamber.

[0043] In this embodiment, the magnetohydrodynamic sealing device 2 is housed within a cavity formed by the first flange 31 and the motor mounting bracket 6, thus achieving axial positioning. The output shaft of the drive motor 1 is connected to the input shaft of the magnetohydrodynamic sealing device 2 via a coupling 8, and the output shaft of the magnetohydrodynamic sealing device 2 is also connected to the right-angle transmission mechanism 4 via another coupling 8, passing through the through holes on the first flange 31 and the bracket 7.

[0044] It can be explained here that one end of the bracket 7 is located inside the second flange 32 and connected to the first flange 31, while the other end extends out of the outside of the second flange 32 to assemble the right-angle transmission mechanism 4.

[0045] The magnetohydrodynamic sealing device 2 maintains a dynamic seal against the vacuum environment even when its shaft rotates at high or low speeds. Furthermore, O-rings are installed between the first flange 31 and the second flange 32, and between the first flange 31 and the housing of the magnetohydrodynamic sealing device 2. These O-rings can be made of radiation-resistant materials such as fluororubber to form a static seal. The magnetohydrodynamic sealing device 2 provides a dynamic seal, while the O-rings provide a static seal, creating a dual design that ensures vacuum integrity throughout the entire transmission path.

[0046] The right-angle transmission mechanism 4 is used to convert the input horizontal rotational motion into the output vertical rotational motion, and integrates the dual functions of angle fine adjustment and diaphragm switching. The right-angle transmission mechanism 4 is fixed to the outside of the first flange 31 by a bracket 7.

[0047] In this embodiment, the right-angle transmission mechanism 4 includes a base 41, a first main shaft 42, a second main shaft 43, and a motion conversion component 44. The base 41 is mounted on the rear end of the flange 3 via a bracket 7. The first main shaft 42 and the second main shaft 43 are detachably mounted on both ends of the base 41, and their axes form a perpendicular relationship in space. At the same time, one end of the first main shaft 42 is connected to the output end of the magnetohydrodynamic sealing device 2, and two peeling film structures 5 are mounted perpendicularly to one end of the second main shaft 43. The motion conversion component 44 is connected between the first main shaft 42 and the second main shaft 43, and is used to convert the lateral rotational motion of the first main shaft 42 into the longitudinal rotational motion of the second main shaft 43, so as to drive the two peeling film structures 5 to perform angle adjustment and / or switching.

[0048] The right-angle transmission mechanism 4 is connected to the drive motor 1 and the two peeling film structures 5, allowing the two peeling film structures 5 to be adjusted in angle or switched in position. The right-angle transmission mechanism 4 is a non-gear type right-angle transmission mechanism consisting of a base 41, a first main shaft 42, and a motion conversion component 44. It replaces the traditional bevel gear transmission method and uses a hinge and connecting rod structure to realize the conversion of motion direction. This not only reduces the processing and assembly cost of components, but also effectively avoids the vibration and noise generated by gear meshing. In addition, the hinge and connecting rod structure greatly reduces wear and tear, thereby significantly reducing the number of times the equipment needs maintenance.

[0049] Simultaneously, the design of the dual-peeling membrane structure 5, combined with the rapid switching function, allows the backup membrane to be activated remotely and automatically without disrupting the vacuum or requiring personnel intervention when the working membrane fails. This extends the continuous operation cycle of the system and reduces downtime caused by replacing the peeling membrane 53 from several hours to minutes, improving the equipment utilization and production efficiency of the cyclotron. At the same time, it completely avoids the risk of radiation exposure to maintenance personnel, resulting in outstanding safety benefits.

[0050] Furthermore, the base 41 consists of a back plate 412 and a first mounting block 411 and a second mounting block 413 disposed at its two ends. The first mounting block 411 is fixed to the bracket 7, and the back plate 412 extends backward and upward from the first mounting block 411, such that the second mounting block 413 is located diagonally above the first mounting block 411.

[0051] The first main shaft 42 is laterally rotatably assembled in the middle of the first mounting block 411, and the second main shaft 43 is longitudinally rotatably assembled in the middle of the second mounting block 413, so that the axes of the first main shaft 42 and the second main shaft 43 are in a spatially skewed perpendicular relationship.

[0052] The outer end of the first main shaft 42 is connected to the drive shaft of the magnetohydrodynamic sealing device 2. The top end of the second main shaft 43 is equipped with a peeling film holder 9 that carries the peeling film structure 5.

[0053] In this embodiment, the motion conversion component 44 consists of two rotating members 441 and a Z-shaped rotating arm 442. One end of each of the two rotating members 441 is rotatably connected to both ends of the Z-shaped rotating arm 442, and the other ends of each rotating member 441 are hinged to the first main shaft 42 and the second main shaft 43 respectively via pins 443. Thus, the rotation of the first main shaft 42 will push the Z-shaped rotating arm 442 through the rotating members 441, and the Z-shaped rotating arm 442 will then drive the other rotating member 441, thereby driving the second main shaft 43 to rotate. Since the axes of the two main shafts are perpendicular to each other in opposite planes, the Z-shaped rotating arm 442 always moves within an inclined space during operation, thus efficiently completing the conversion of motion direction and the transmission of force.

[0054] Specifically, the axis of the second main shaft 43 does not intersect the axis of the first main shaft 42 perpendicularly in the same horizontal plane, but is located diagonally above it, thus creating a spatially skewed perpendicular relationship between the axes of the first main shaft 42 and the second main shaft 43. This layout not only reduces the projected size of the transmission mechanism along the particle beam line of sight, making the overall device flatter, but also provides an asymmetrical motion space for the Z-shaped rotating arm 442, avoiding dead points and ensuring the continuity and smoothness of transmission across all adjustment angles.

[0055] It can be explained here that when the first main shaft 42 is driven to rotate by the drive motor 1 and the magnetic fluid sealing device 2, one end of the Z-shaped rotating arm 442 and the rotating part 441 at that end rotate along the central axis of the first main shaft 42, while the other end of the Z-shaped rotating arm 442 and the rotating part 441 at that end rotate along the central axis of the second main shaft 43 under the positioning action of the second main shaft 43. That is, the Z-shaped rotating arm 442 always moves in an inclined space during operation, thereby realizing the conversion of the lateral rotational motion of the first main shaft 42 into the longitudinal rotational motion of the second main shaft 43, thereby driving the two peeling film structures 5 to perform angle adjustment and / or switching.

[0056] The two major functions of precise angle adjustment and rapid switching of the spare membrane are integrated into the same right-angle transmission mechanism 4. By controlling the drive motor 1 to rotate at different amplitudes, this mechanism can drive the second main shaft 43 and the peeling membrane structure 5 to achieve precise angle adjustment within a small range, and also drive them to rotate at a large angle, thereby realizing the interchange of the positions of the two vertically arranged peeling membrane structures 5. This avoids the complexity of setting up two independent drive systems for the two functions, making the overall device structure effective and compact, and suitable for installation in the space-constrained vacuum chamber interface of the cyclotron accelerator.

[0057] It is worth noting that the first main shaft 42, the rotating part 441, the Z-shaped rotating arm 442, the rotating part 441, and the second main shaft 43 cooperate to form a hinged four-bar linkage, which not only facilitates control, but also utilizes multiple hinge points to enable it to have a certain self-locking or holding torque capability when the drive motor 1 is de-energized, thereby improving the stability of the position of the peeling film structure 5.

[0058] The peeling film holder 9, viewed from above, has an L-shaped structure. It is securely fixed to the end of the second main shaft 43 by set screws or pins to ensure it does not loosen during rotation. The peeling film holder 9 has slots on its two opposite, perpendicular end faces. The two peeling film structures 5 are respectively embedded in these slots, thus ensuring that the working surfaces of the two peeling films 53 are also in an opposite, perpendicular spatial relationship.

[0059] Each release membrane structure 5 adopts a modular design, including an outer frame 51 connected to the membrane holder, an inner frame 52 for tensioning and fixing the release membrane 53, and the release membrane 53 itself in the inner frame 52. The outer frame 51 is detachably mounted on the slot on the end face of the release membrane holder 9, while the inner frame 52 is snapped onto the inner wall of the outer frame 51, and the release membrane 53 is disposed inside the inner frame 52.

[0060] The peeling membrane structure 5 adopts a modular design with an outer frame 51 and an inner frame 52, and is snapped onto the peeling membrane frame 9, making the replacement of a single peeling membrane 53 simple and quick. Furthermore, all components of the transmission mechanism are detachable, facilitating later inspection and maintenance.

[0061] The working principle of this invention is based on precise control of the rotation angle and direction of the drive motor 1. Through the aforementioned transmission chain, two operating modes for the position of the peeling film 53 are achieved:

[0062] Angle Fine-tuning Mode: When the angle of the peeling membrane 53 being used needs to be optimized during equipment operation, the control system commands the drive motor 1 to rotate forward or backward by a small angle, such as ±10°. This motion is transmitted through the magnetohydrodynamic sealing device 2, the first main shaft 42, and the motion conversion component 44, ultimately transforming into a small-angle oscillation of the second main shaft 43 and the peeling membrane holder 9 on it, as well as the currently working membrane. This mode is used to finely adjust the angle between the membrane surface and the bombardment angle of the particle beam to obtain the best extraction efficiency.

[0063] Backup membrane switching mode: This mode is activated when the monitoring system determines that the current working membrane's performance has deteriorated or failed. The control system commands the drive motor 1 to rotate continuously by a large angle, for example, 90°. This large-range rotation, through the transmission mechanism, drives the second main shaft 43 to rotate the L-shaped peeling membrane holder 9 by approximately 90°. As a result, the backup peeling membrane 53, which was originally in a vertical position (non-working position), is rotated to the position of the original working membrane, while the failed working membrane is removed. After the switching is completed, the angle fine-tuning mode can be entered immediately or shortly thereafter to fine-tune and align the new working membrane. The entire process is completed automatically within the vacuum chamber without the need for vacuum breaking or manual intervention.

[0064] During installation, the mounting face of the second flange 32 is first aligned with the standard interface on the vacuum chamber wall of the cyclotron, and bolted in place to ensure a seal. The right-angle transmission mechanism 4 and its peeling membrane structure 5 then extend into the predetermined position inside the vacuum chamber. The drive motor 1 and control system are located outside the vacuum chamber for easy operation and maintenance. The I-beam design of flange 3 provides stable support and necessary installation space for the internal support 7 and transmission components.

[0065] Several points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0066] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A particle beam extraction device, characterized in that, include: The drive motor (1), the magnetic fluid sealing device (2), the flange (3), and the right-angle transmission mechanism (4) are connected in sequence. The drive motor (1) is fixed to the front end of the flange (3) by a motor mounting bracket (6); The magnetic fluid sealing device (2) is located inside the flange (3) and the motor mounting bracket (6). The input end of the magnetic fluid sealing device (2) is connected to the output shaft of the drive motor (1), and the output end of the magnetic fluid sealing device (2) passes through the flange (3) and is connected to the right angle transmission mechanism (4). The right-angle transmission mechanism (4) is mounted on the rear end of the flange (3) via a bracket (7). The input end of the right-angle transmission mechanism (4) is connected to the output end of the magnetic fluid sealing device (2). Two peeling film structures (5) are also provided on the output shaft of the right-angle transmission mechanism (4). The right-angle transmission mechanism (4) includes a base (41), a first main shaft (42), a second main shaft (43), and a motion conversion component (44). The base (41) is mounted on the rear end of the flange (3) via a bracket (7). The first main shaft (42) and the second main shaft (43) are detachably mounted on both ends of the base (41), and their axes form a perpendicular relationship in space. One end of the first main shaft (42) is connected to the output end of the magnetic fluid sealing device (2). Two peeling film structures (5) are mounted perpendicularly on one end of the second main shaft (43). The motion conversion component (44) is connected between the first main shaft (42) and the second main shaft (43) to convert the transverse rotational motion of the first main shaft (42) into the longitudinal rotational motion of the second main shaft (43) to drive the two peeling film structures (5) to adjust and / or switch angles. It also includes a peeling film holder (9) set on the second main shaft (43). The peeling film holder (9) has an L-shaped structure when viewed from above. The two end faces of the peeling film holder (9) are provided with slots. The two peeling film structures (5) are respectively assembled in the slots of the peeling film holder (9) to form a vertical relationship.

2. The particle beam extraction device according to claim 1, characterized in that: The motion conversion component (44) includes two rotating parts (441) and a Z-shaped rotating arm (442). One end of each of the two rotating parts (441) is rotatably connected to both ends of the Z-shaped rotating arm (442), and the other end of each of the two rotating parts (441) is hinged to the first main shaft (42) and the second main shaft (43) respectively by pins (443).

3. The particle beam extraction device according to claim 1, characterized in that: The base (41) includes a back plate (412) and a first mounting block (411) and a second mounting block (413) disposed at both ends of the back plate (412). The first mounting block (411) is fixedly mounted on the bracket (7), and the back plate (412) is fixedly mounted on the back of the first mounting block (411). The back plate (412) is inclined. The second mounting block (413) is disposed at the end of the back plate (412) and located obliquely above the first mounting block (411). The first main shaft (42) is laterally rotated and assembled in the middle of the first mounting block (411), and the second main shaft (43) is longitudinally rotated and assembled in the middle of the second mounting block (413), so that the axes of the first main shaft (42) and the second main shaft (43) are perpendicular to each other in space.

4. The particle beam extraction device according to claim 1, characterized in that: The flange (3) includes a first flange (31) and a second flange (32). The first flange (31) is used to connect and assemble the magnetohydrodynamic sealing device (2). The second flange (32) has an I-shaped cross section. One side of it is connected and assembled with the first flange (31), and the other side is used to assemble the cyclotron equipment. One end of the bracket (7) passes through the inside of the second flange (32) and is assembled on the other side of the first flange (31). A sealing ring is provided between the first flange (31), the second flange (32), and the magnetohydrodynamic sealing device (2).

5. A particle beam extraction device according to claim 1, characterized in that: Couplings (8) are provided at the shaft connection between the drive motor (1) and the magnetic fluid sealing device (2) and at the shaft connection between the magnetic fluid sealing device (2) and the first main shaft (42).

6. A particle beam extraction device according to claim 1, characterized in that: The peeling film structure (5) includes an outer frame (51), an inner frame (52), and a peeling film (53). Both the outer frame (51) and the inner frame (52) are U-shaped. The outer frame (51) is detachably mounted on the end face of the peeling film frame (9), and the inner frame (52) is snapped onto the inner wall of the outer frame (51). The peeling film (53) is set inside the inner frame (52).

7. A particle beam extraction device according to claim 4, characterized in that: Both the first flange (31) and the bracket (7) are provided with through holes for the output end of the magnetohydrodynamic sealing device (2) to pass through.

8. A method for adjusting a stripping membrane, based on a particle beam extraction device according to any one of claims 1-7, characterized in that: Includes the following two modes: Angle fine-tuning mode: Control the drive motor (1) to rotate at a small angle, and drive the peeling film structure (5) to perform small-range angle adjustment through the right angle transmission mechanism (4) so ​​that the peeling film (53) corresponds to the contact angle of the particle beam; Backup membrane switching mode: Control the drive motor (1) to rotate at a large angle, and drive the two peeling membrane structures (5) to exchange positions through the right angle transmission mechanism (4) until the backup peeling membrane (53) is moved to the position of the current peeling membrane (53).

9. A cyclotron, characterized in that, Includes a particle beam extraction device according to any one of claims 1-7.

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