Accelerator carbon film beam extraction drive

Abstract

An accelerator carbon film beam extraction transmission device, comprising a vacuum guide, the vacuum guide comprising a sealed cavity and a sealed pressure bushing fixed below the sealed cavity, the top end of the sealed cavity and the lower end of the sealed pressure bushing are fixedly connected with a mounting flange and a motor mounting seat respectively, the central part of the sealed cavity and the central part of the sealed pressure bushing are provided with shaft holes, a main shaft is installed in the shaft holes, an anti-main shaft eccentric device and a main shaft limiting device are arranged in the sealed pressure bushing, a sealing device is arranged in the sealed cavity, the main shaft penetrates through the top end of the sealed cavity and is fixedly connected with a connector, and the connector is connected with a shaft rod driving the accelerator carbon film, the motor transmission is conducted to the vacuum environment through the independent vacuum guide, the gap is reduced by reducing the non-contact connection and the connection position, the return error is reduced, the use is more stable in the high magnetic field environment, and the return error caused by the magnetic reduction of the magnetic coupling due to the high temperature is reduced.

Description

Technical Field

[0001] This invention belongs to the field of accelerator technology, specifically relating to an accelerator carbon film beam extraction transmission device. Background Technology

[0002] During accelerator commissioning, it is sometimes necessary to rotate the carbon film to create an angle and prevent the beam from being drawn out. Therefore, it is necessary to change the angle of the carbon film. Since the carbon film is inside the accelerator cavity, the rotational motion of the external motor needs to be introduced into the vacuum. The commonly used vacuum rotation introduction structures are mainly the bellows type and the magnetic coupling type.

[0003] Bellows-type vacuum initiators, due to their use of multiple bearings and the large clearance of these bearings, experience increased hysteresis errors. Magnetic-coupled vacuum initiators, affected by the accelerator's magnetic field and the high heat generated during target firing, also suffer from increased errors. These structural or mechanistic errors in both types of vacuum initiators prevent the carbon film from accurately reaching the designated position during rotation, thus impacting the efficiency and results of accelerator beam extraction and commissioning. Summary of the Invention

[0004] In view of the technical defects of the prior art, the present invention discloses a carbon film beam extraction transmission device.

[0005] The accelerator carbon film beam extraction transmission device of the present invention includes a vacuum inductor, which includes a sealed cavity and a sealing sleeve fixed below the sealed cavity. The top end of the sealed cavity and the bottom end of the sealing sleeve are fixedly connected to a mounting flange and a motor mounting base, respectively. Both the sealed cavity and the sealing sleeve have a shaft hole in the center. A main shaft is installed in the shaft hole. An anti-eccentricity device and a main shaft limiting device are provided in the sealing sleeve. A sealing device is provided in the sealed cavity. The main shaft passes through the top end of the sealed cavity and is fixedly connected to a connector. The connector is connected to the shaft that drives the accelerator carbon film.

[0006] Preferably, the transmission device further includes a sleeve fixed to the mounting flange, the other end of the sleeve being connected to a ceramic spacer, and the shaft being located inside the sleeve and the ceramic spacer.

[0007] Preferably, a sleeve sealing ring is provided at the connection between the mounting flange and the sleeve, and an oxygen-free copper gasket is provided at the connection between the mounting flange and the top of the sealing cavity.

[0008] Preferably, the end of the spindle not connected to the connector is connected to a coupling.

[0009] Preferably, the sealing device is a pair of JO sealing rings installed back to back in the sealing cavity.

[0010] Preferably, the diameter of the portion of the spindle located within the sealed cavity is larger than that of the other portions of the spindle.

[0011] Preferably, the anti-spindle eccentricity device is one or more stacked bearings disposed above the sealing sleeve. The bearings are sleeved on the spindle, with their outer diameter and inner diameter of the sealing sleeve in clearance fit. They are limited by a bearing retainer fixed inside the sealing sleeve and located below the bearings. The bearing retainer has a through hole in the center for the spindle to pass through.

[0012] Preferably, the spindle limiting device is a shaft retainer located below the bearing retainer, the shaft retainer is fixed on the spindle, and the through hole in the center of the bearing retainer is smaller than the shaft retainer.

[0013] This invention transmits motor power to a vacuum environment through an independent vacuum inductor. Compared with the bellows vacuum inductor which uses multiple bearings for linkage transmission, this invention transmits motor rotation directly to the shaft in the vacuum through only one connector. By reducing non-contact connections and connection positions, it reduces gaps and thus reduces backlash error. Compared with magnetic coupling inductors, it is more stable in high magnetic field environments and significantly reduces backlash error caused by the reduction of magnetism in the magnetic coupling due to high temperature. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a specific embodiment of the accelerator carbon film beam extraction transmission device of the present invention; Figure 2 for Figure 1 The specific embodiment shown is a cross-sectional view along the CC direction; Figure 3 This is a schematic diagram of a specific embodiment of the vacuum introducer described in this invention; Figure 4 for Figure 3 The specific embodiment shown is a cross-sectional view along the CC direction; The attached figure is labeled as follows: 1. Motor, 2. Coupling, 3. Vacuum inlet, 4. Mounting flange, 5. Sleeve, 6. Ceramic spacer, 7. Shaft, 8. Connector, 9. Oxygen-free copper gasket, 10. Sleeve seal ring, 11. Shaft snap ring, 12. Bearing snap ring, 13. Motor mounting base, 14. Main shaft, 15. Bearing, 16. Sealing sleeve, 17. JO seal ring, 18. Sealing cavity, 19. Bolt. Detailed Implementation

[0015] To more intuitively and clearly describe the specific details of the technical solution of the present invention, a detailed description will be provided below in conjunction with specific embodiments and example drawings.

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0017] like Figure 1 As shown, the accelerator carbon film beam extraction transmission device of the present invention includes a vacuum inductor. The vacuum inductor 3 includes a sealed cavity 18 and a sealing sleeve 16 fixed below the sealed cavity. The top end of the sealed cavity 18 and the bottom end of the sealing sleeve are fixedly connected to the mounting flange 4 and the motor mounting base 13, respectively. Both the sealed cavity and the sealing sleeve have a shaft hole in the center. A main shaft 14 is installed in the shaft hole. An anti-eccentric device and a main shaft limiting device are provided in the sealing sleeve. A sealing device is provided in the sealed cavity. The main shaft 14 passes through the top end of the sealed cavity 18 and is fixedly connected to the connector 8. The connector 8 is connected to the shaft 7 that drives the accelerator carbon film.

[0018] The motor mounting base 13 is used to fix the motor 1. The motor mounting base 13 is fixed to the sealing sleeve 16 with bolts to facilitate the installation of the motor. The motor shaft rotates through the vacuum inlet, which is in a normal non-vacuum environment, and transmits the rotation to the shaft in a vacuum environment, driving the shaft to rotate.

[0019] One end of the main shaft inside the vacuum inlet 3 is connected to the motor shaft, and the other end is connected to the connector 8. The rotation of the motor shaft drives the main shaft 14 inside the vacuum inlet 3 to rotate, the main shaft drives the connector 8 to rotate, and the connector drives the shaft 7 of the accelerator carbon film to rotate.

[0020] The vacuum introducer consists of a sealed cavity 18 and a sealed pressure sleeve 16, such as Figure 4 As shown, both the sealing cavity and the sealing sleeve are hollow cylindrical structures. The two end faces of the lower end of the sealing cavity 18 and the upper end of the sealing sleeve 16 cooperate with each other and are fixedly connected into a whole by multiple bolts 19.

[0021] The main shaft passes through the sealed cavity and the sealing sleeve. The sealing sleeve contains an anti-spindle eccentricity device and a spindle limiting device to prevent eccentricity and axial displacement during spindle rotation. A mounting flange is used to fix the vacuum introducer to the accelerator body. One end of the mounting flange secures the sealing cavity of the vacuum introducer, and the other end is fixed to the accelerator body (not shown in the figure). The sealing device inside the sealed cavity ensures a seal between the motor side and the shaft side while the vacuum introducer transmits rotation through the main shaft. The sealing cavity of the vacuum introducer 3 is mounted on the mounting flange 4 with screws. The mounting flange 4 is then mounted to the accelerator body with screws.

[0022] Figure 1 In the specific embodiment shown, the transmission device further includes a sleeve fixed on the mounting flange, and a ceramic spacer is connected to the other end of the sleeve. The shaft 7 is located inside the sleeve 5 and the ceramic spacer 6. The sleeve 5 and the ceramic spacer 6 are used to protect and seal the part of the shaft 7 inside the accelerator. The ceramic spacer 6 is used to form electrical isolation with the sleeve 5 to prevent the transmission of sleeve voltage.

[0023] Figure 2 In the specific embodiment shown, a sleeve sealing ring 10 is provided at the connection between the mounting flange and the sleeve, and an oxygen-free copper gasket 9 is provided at the connection between the mounting flange and the top of the sealing cavity. These are used to enhance the sealing at the connection between the mounting flange and the sleeve, and at the connection between the mounting flange and the top of the sealing cavity, respectively. The main shaft of the vacuum introducer can be connected to the motor shaft via a coupling 2.

[0024] The vacuum inside the accelerator is sealed by a multi-layered structure consisting of the metal seal of the oxygen-free copper gasket 9, the sleeve sealing ring 10, and the sealing device installed in the vacuum inlet sealing cavity, thus ensuring the vacuum inside the accelerator.

[0025] The shaft 7 passes through the ceramic spacer 6, then through the sleeve 5, and is connected to the main shaft of the vacuum inductor 3 via the connector 8. The rotation of the motor 1, via the coupling 2, drives the main shaft of the vacuum inductor 3 to rotate, which in turn drives the shaft 7 to rotate via the connector 8. This transmits the rotational motion of the motor 1 to the vacuum environment where the shaft is located, thereby controlling the angle of the carbon film at the top of the transmission device and adjusting and controlling the accelerator beam extraction.

[0026] like Figure 3 and Figure 4 The diagram shows a specific implementation of the vacuum inlet device. The sealing device consists of a pair of JO sealing rings 17 installed back-to-back in the sealing cavity 18. By utilizing the interference fit and the pressure difference generated during air extraction, they tightly fit the shaft surface, thereby achieving a reliable sealing effect. The back-to-back installation achieves bidirectional sealing. The JO sealing rings 17 are fitted on the spindle, which neither affects the rotation of the spindle nor seals the spindle. Figure 4 In the specific embodiment shown, the diameter of the portion of the spindle located within the sealed cavity is larger than that of the other portions of the spindle, so that the spindle can be axially limited by the sealed cavity, while simultaneously enhancing the sealing effect.

[0027] Figure 4In the specific embodiment shown, the anti-spindle eccentricity device consists of two stacked bearings 15 positioned above the sealing sleeve 16. The bearings 15 are fitted onto the spindle 14, with their outer diameters clearance-fitted to the inner diameter of the sealing sleeve 16. They are limited by a bearing retainer 12 fixed inside the sealing sleeve and located below the bearings. The bearing retainer 12 has a through hole in its center for the spindle to pass through. One or more bearings 15 reduce eccentricity caused by spindle clearance by clamping the bearings and being limited by the sealing sleeve 16. The lowermost bearing 15 is fixed below the bearing retainer 12, preventing the one or more bearings above the bearing retainer 12 from moving up or down.

[0028] Figure 4 In the specific embodiment shown, the spindle limiting device is a shaft retainer 11 located below the bearing retainer 12. The shaft retainer 11 is fixed to the spindle, and the through hole in the center of the bearing retainer 12 is smaller than that of the shaft retainer 11. The shaft retainer 11 is a ring-shaped elastic component that holds the spindle tightly and rotates with it through elastic force, and is blocked by the bearing retainer 12 to limit the bearing. A vacuum inlet device is used to achieve sealed transmission of rotation and to prevent eccentricity and vertical displacement of the spindle.

[0029] This invention transmits motor power to a vacuum environment through an independent vacuum inductor. Compared with the bellows vacuum inductor which uses multiple bearings for linkage transmission, this invention transmits motor rotation directly to the shaft in the vacuum through only one connector. By reducing non-contact connections and connection positions, it reduces gaps and thus reduces backlash error. Compared with magnetic coupling inductors, it is more stable in high magnetic field environments and significantly reduces backlash error caused by the reduction of magnetism in the magnetic coupling due to high temperature.

[0030] The foregoing descriptions are preferred embodiments of the present invention. Unless there is a clear contradiction between the preferred embodiments or a premise based on a particular preferred embodiment, the preferred embodiments can be arbitrarily combined and used. The embodiments and specific parameters described are only for clearly illustrating the inventor's invention verification process and are not intended to limit the scope of patent protection of the present invention. The scope of patent protection of the present invention shall still be determined by its claims. Similarly, any equivalent structural changes made based on the content of the specification of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A carbon film beam extraction transmission device for an accelerator, characterized in that, The vacuum inlet includes a vacuum inlet (3), which includes a sealed cavity (18) and a sealing sleeve (16) fixed below the sealed cavity. The top end of the sealed cavity (18) and the bottom end of the sealing sleeve (16) are fixedly connected to the mounting flange (4) and the motor mounting base (13) respectively. Both the sealed cavity and the sealing sleeve have a shaft hole in the center. A main shaft (14) is installed in the shaft hole. An anti-main shaft eccentricity device and a main shaft limiting device are provided in the sealing sleeve (16). A sealing device is provided in the sealed cavity (18). The main shaft (14) passes through the top end of the sealed cavity (18) and is fixedly connected to the connector (8). The connector (8) is connected to the shaft (7) of the driving accelerator carbon film. The anti-spindle eccentricity device is one or more stacked bearings (15) arranged above the sealing sleeve. The bearings (15) are sleeved on the spindle (14), with their outer diameter in clearance fit with the inner diameter of the sealing sleeve (16), and are limited by a bearing retainer (12) fixed inside the sealing sleeve and located below the bearing. The bearing retainer (12) has a through hole in the center for the spindle (14) to pass through. The spindle limiting device is a shaft retainer (11) located below the bearing retainer. The shaft retainer (11) is fixed on the spindle (14), and the through hole in the center of the bearing retainer is smaller than that of the shaft retainer (11).

2. The accelerator carbon film beam extraction transmission device as described in claim 1, characterized in that, The transmission device also includes a sleeve (5) fixed on the mounting flange (4), and a ceramic spacer (6) is connected to the other end of the sleeve. The shaft (7) is located inside the sleeve (5) and the ceramic spacer (6).

3. The accelerator carbon film beam extraction transmission device as described in claim 2, characterized in that, A sleeve sealing ring (10) is provided at the connection between the mounting flange (4) and the sleeve (5), and an oxygen-free copper gasket (9) is provided at the connection between the mounting flange (4) and the top of the sealing cavity (18).

4. The accelerator carbon film beam extraction transmission device as described in claim 1, characterized in that, The end of the main shaft (14) that is not connected to the connector is connected to a coupling (2).

5. The accelerator carbon film beam extraction transmission device as described in claim 1, characterized in that, The sealing device is a pair of JO sealing rings (17) installed back to back in the sealing cavity.

6. The accelerator carbon film beam extraction transmission device as described in claim 5, characterized in that, The diameter of the portion of the spindle (14) located inside the sealed cavity (18) is larger than that of the other portions of the spindle.

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