Electron beam welding device and method for cavity of high-frequency cavity of proton cyclotron

Abstract

The invention relates to the field of cyclotrons, and discloses a cavity electron beam welding device and method for a high-frequency cavity of a proton cyclotron, and the device comprises a base which comprises a switching part and two fan-shaped parts; the limiting mechanism comprises first components, a second component and a third component, and the third component, the second component and the two first components jointly define a first limiting space; the first supporting component is detachably arranged on at least one fan-shaped part, and a second limiting space is formed between the first supporting component and the second component; the second supporting part is detachably arranged on one fan-shaped part, and a third limiting space is formed between the second supporting part and the second part; a third support member selectively disposed on an upper side of the second support member; and the lateral limiting piece is arranged on the other side, close to the switching part, of the fan-shaped part, and the lateral limiting piece is detachably connected with the fan-shaped part. The number of welding tools and the welding frequency can be reduced, and the welding efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cyclotrons, and in particular to an electron beam welding device and a welding method for the cavity of a high-frequency cavity of a proton cyclotron. Background Art

[0002] Currently, proton therapy is one of the important frontier research directions in the field of medical physics. As an important device for proton therapy, the proton cyclotron plays a key role in clinical applications. Among them, the high-frequency cavity is one of the core components of the proton cyclotron, and its processing and manufacturing quality directly affects the overall performance and stability of the device. Therefore, the precision manufacturing of the high-frequency cavity is particularly crucial. When using an electron beam welding tooling for welding in a proton cyclotron, multiple sets of welding toolings are required to fix and weld multiple workpieces separately, with low flexibility. When changing products, a new corresponding set of toolings needs to be designed, resulting in a long changeover time during small-batch and multi-variety production, increasing the time cost. Moreover, the structure of the welding tooling will also block the electron beam path or interfere with the movement of the welding torch. For welding one workpiece, it needs to be taken out of the vacuum chamber multiple times, re-positioned and fixed, and then the next welding sequence is carried out. The vacuum pumping and venting time takes about one to several hours, and each time it is installed and fixed to the welding position, it also requires repeated dial indicator positioning, resulting in relatively low work efficiency. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, an object of the present invention is to provide an electron beam welding device for the cavity of a high-frequency cavity of a proton cyclotron, which can reduce the number of welding toolings and the number of welding times, and improve the welding efficiency.

[0004] The present invention also aims to provide an electron beam welding method for the cavity of a high-frequency cavity of a proton cyclotron to apply the above-mentioned electron beam welding device for the cavity of a high-frequency cavity of a proton cyclotron.

[0005] According to an embodiment of the present invention, the cavity electron beam welding device of the high-frequency cavity of a proton cyclotron includes: a base, a limiting mechanism, a first supporting component, a second supporting component, a third supporting component and a lateral limiting member. The base includes a transition portion and two fan-shaped portions, and the two fan-shaped portions are connected by the transition portion; the two fan-shaped portions are both provided with the limiting mechanism, and the limiting mechanism includes a first component, a second component and a third component, the first component is two and is arranged on both sides of the arc length direction of the fan-shaped portion, the second component is arranged on the side of the fan-shaped portion away from the transition portion, the third component is located on the upper side of the second component, and is detachably connected to the second component, and the third component, the second component and the two first components jointly define a first limiting space; the first supporting component is located in the first limiting space, and is detachably arranged in On at least one of the fan-shaped portions, a second limiting space is formed between the first supporting component and the second component; the second supporting component is located in the first limiting space and is detachably provided on one of the fan-shaped portions, a third limiting space is formed between the second supporting component and the second component, and the height of the second supporting component is less than the height of the first supporting component; the third supporting component can be selectively arranged on the upper side of the second supporting component; the lateral limiting member and the second supporting member are provided on the same fan-shaped portion, and are provided on the other side of the fan-shaped portion close to the adapter portion, and the lateral limiting member is detachably connected to the fan-shaped portion.

[0006] According to the cavity electron beam welding device of the high-frequency cavity of the proton cyclotron according to the embodiment of the present invention, the precise assembly and positioning of the multiple components of the lower cavity can be achieved through the limiting assembly, the first supporting component, the second supporting component, the third supporting component and the lateral limiting component, as well as the precise assembly and positioning of the inner conductor and the lower cavity, which is conducive to reducing the number of welding tools and reducing human operation errors. In addition, the positioning of the inner conductor and the lower cavity by the above device is more accurate, which can reduce the risk of welding deformation during welding and improve the welding quality and the performance stability of the finished welded product. The above device can also reduce the assembly steps and the number of times of entering the vacuum chamber, and can achieve one-time welding of multiple welds in the vacuum chamber, which can improve welding efficiency, and can also be used as a post-welding shape-preserving tool, with better applicability.

[0007] In some embodiments of the present invention, the first component includes a plurality of first limiting members, which are arranged at intervals along the radial direction of the fan-shaped portion; the first limiting member includes a fixing portion and a clamping portion, the fixing portion is arranged on the fan-shaped portion, a clamping groove is formed between the clamping portion and the fixing portion, the clamping groove is open toward one side of the first limiting space, and the clamping portion is movably arranged on the fixing portion along the vertical direction.

[0008] In some embodiments of the present invention, the clamping portion includes a connected connecting section and a clamping section, the connecting section is arranged on a side of the fixing portion away from the first limiting space, the connecting section is provided with a first strip hole, the fixing portion is provided with a first adjusting bolt, the first adjusting bolt is passed through the first strip hole, and the clamping section is arranged on the upper side of the fixing portion.

[0009] In some embodiments of the present invention, the second component includes a plurality of adjustable limit members and a plurality of fixed limit members, the plurality of adjustable limit members and the plurality of fixed limit members are spaced apart along the arc length direction, the fixed limit member is provided with a slot open toward one side of the first limit space, the adjustable limit member is movably provided on the fan-shaped portion along the radial direction of the fan-shaped portion, and the adjustable limit member and the fixed limit member are spaced apart along the radial direction.

[0010] In some embodiments of the present invention, the adjustable limit member includes a first part and a second part vertically connected, the first part is provided with a second strip hole, the fan-shaped part is provided with a second adjusting bolt, the second adjusting bolt is passed through the second strip hole, the second part is perpendicular to the fan-shaped part, and an avoidance groove is provided on one side close to the limit space.

[0011] In some embodiments of the present invention, the third component is in the shape of an arc-shaped strip extending along the arc length direction.

[0012] In some embodiments of the present invention, the sector-shaped portion is provided with an inspection port; there are multiple inspection ports, the multiple inspection ports are arranged at intervals along the arc length direction of the sector-shaped portion, and each inspection port extends along the radial direction of the sector-shaped portion.

[0013] In some embodiments of the present invention, the lateral limiting member includes a positioning pin and a limiting block, the positioning pin and the limiting block are detachably arranged on the fan-shaped portion, and the limiting block is arranged on a side of the positioning pin close to the adapter portion.

[0014] In some embodiments of the present invention, the first supporting component includes a plurality of first plates, which are spaced apart along the arc length direction; the second supporting component includes a plurality of second plates, which are spaced apart along the arc length direction.

[0015] The method for electron beam welding of the cavity of the proton cyclotron high-frequency cavity according to an embodiment of the present invention includes the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity as described in any one of the foregoing; the proton cyclotron high-frequency cavity includes a lower cavity and an inner conductor, the lower cavity includes a bottom shell wall and two side shell walls, the bottom shell wall includes two sector wall segments, one end of each sector wall segment in the radial direction is open and forms an opening, and the side shell wall covers the opening; the method includes: fixing the sector wall segment, the side shell wall and the inner conductor by using the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity; placing the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity into a vacuum chamber, welding the sector wall segment and the side shell wall, and welding the side shell wall and the inner conductor.

[0016] The method for electron beam welding of the cavity of the proton cyclotron high-frequency cavity according to an embodiment of the present invention places a sector wall segment, a side shell wall and an inner conductor into the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity, and adjusts the adjustable limit member and the first limit member to fix the sector wall segment, the side shell wall and the inner conductor. Then, place the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity into a vacuum chamber, weld the sector wall segment and the side shell wall, and weld the side shell wall and the inner conductor. All welding can be completed at one time, avoiding entering the vacuum chamber again, reducing the number of times of the tooling for electron beam welding of the cavity of the proton cyclotron high-frequency cavity, improving the utilization rate of the tooling, and saving costs.

[0017] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein: Figure 1 is a partial structural schematic diagram of the proton cyclotron high-frequency cavity in an embodiment of the present invention; Figure 2 is a three-dimensional structural schematic diagram of the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity provided by some embodiments of the present invention; Figure 3 is a top view of the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity with some structures removed provided by some embodiments of the present invention; Figure 4 is a structural schematic diagram of the device for electron beam welding of the cavity of the proton cyclotron high-frequency cavity after being assembled with the lower cavity and the inner conductor provided by some embodiments of the present invention; Figure 5A cross-sectional view of a cavity electron beam welding device of a proton cyclotron high-frequency cavity after being assembled with a lower cavity and an inner conductor provided in some embodiments of the present invention; Figure 6 for Figure 2 A local enlarged view of location I; Figure 7 for Figure 2 A partial enlarged view of location II; Figure 8 for Figure 2 A partial enlarged view of location III; Figure 9 for Figure 2 A local enlarged view of IV; Figure 10 A process flow chart of a cavity electron beam welding method for a proton cyclotron high frequency cavity provided in some embodiments of the present invention Figure 1 ; Figure 11 A process flow chart of a cavity electron beam welding method for a proton cyclotron high frequency cavity provided in some embodiments of the present invention Figure 2 ; Figure 12 A process flow chart of a cavity electron beam welding method for a proton cyclotron high frequency cavity provided in some embodiments of the present invention Figure 3 .

[0019] Reference numerals: 100. Cavity electron beam welding device for high-frequency cavity of proton cyclotron; 10. base; 11. adapter; 11a. mounting hole; 12. sector; 12a. inspection port; 121. second adjusting bolt; 20. Limiting mechanism; 20a. First limiting space; 21. First component; 211. First limiting member; 211a. Clamping groove; 2111. Fixing portion; 21111. First adjusting bolt; 2112. Clamping portion; 21121. Connecting section; 21121a. First strip hole; 21122. Clamping section; 22. Second component; 221. Adjustable limiting member; 2211. First portion; 2211a. Second strip hole; 2212. Second portion; 2212a. Avoiding groove; 222. Fixed limiting member; 222a. Card slot; 23. Third component; 30. first supporting member; 30a. second limiting space; 31. first plate; 40. second supporting member; 40a. third limiting space; 41. second plate; 50. A third supporting member; 60. lateral limiter; 61. positioning pin; 62. limiter block; 200, High-frequency cavity of proton cyclotron; 210, Lower cavity; 201, Bottom shell wall; 2011, Transition wall section; 2012, Sector wall section; 20121, First flanging; 202, Side shell wall; 202a, Notch; 2021, Second flanging; 220, Inner conductor; 2201, First conductor part; 2202, Second conductor part. Detailed implementation mode

[0020] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features, used to distinguish and describe features, without order or importance.

[0023] In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0024] The following refers to Figures 1 - 9 to describe the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron in the embodiments of the present invention.

[0025] As Figure 1As shown, the high-frequency cavity 200 of the proton cyclotron may include a lower cavity 210, an inner conductor 220, and an upper cavity. The inner conductor 220 is disposed on the lower cavity 210, and the upper cavity covers the lower cavity 210. The lower cavity 210 includes a bottom shell wall 201 and a side shell wall 202. The bottom shell wall 201 includes a transition wall section 2011 and a sector wall section 2012. There are two sector wall sections 2012, and the two sector wall sections 2012 are connected by the transition wall section 2011. One end of the sector wall section 2012 in the radial direction is open to form an opening, and the side shell wall 202 covers the opening and is welded to the sector wall section 2012. The inner conductor 220 includes a first conductor portion 2201 and a second conductor portion 2202 connected to each other. A notch 202a is provided in one of the side shell walls 202, and the second conductor portion 2202 is disposed in the notch 202a and welded to the side shell wall 202. It can be understood that the above structure constitutes a compact high-frequency cavity of a proton cyclotron, and has a special-shaped structure with a thin-wall design feature. The material used is oxygen-free copper with excellent thermal and electrical conductivity. For the high-frequency cavity 200 of the proton cyclotron with this structure, the conventional process is as follows: First, each component is processed with high precision, and then the electron beam welding technology is used in stages for precise splicing. This method requires a variety of welding tooling. For the welding of every two components, a set of tooling is required, and the welding is carried out in a vacuum chamber once. The number of tooling required is relatively large, and the time-consuming for frequently entering the vacuum chamber is also relatively long. The total time required for welding the entire workpiece is relatively long, and the working efficiency is relatively low.

[0026] For the high-frequency cavity 200 of the proton cyclotron with the above structure, the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron according to the embodiment of the present invention can be used for welding the lower cavity 210 and the inner conductor 220.

[0027] As Figures 2 to 3 shown, the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron according to the embodiment of the present invention includes: a base 10, a limiting mechanism 20, a first support member 30, a second support member 40, a third support member 50, and a lateral limiting member 60.

[0028] The base 10 includes an adapter 11 and two fan-shaped parts 12, and the two fan-shaped parts 12 are connected through the adapter 11. Both fan-shaped parts 12 are provided with a limiting mechanism 20, and the limiting mechanism 20 includes a first component 21, a second component 22 and a third component 23. The first component 21 is two and is arranged on both sides of the arc length direction of the fan-shaped part 12. The second component 22 is arranged on the side of the fan-shaped part 12 away from the adapter 11. The third component 23 is located on the upper side of the second component 22 and is detachably connected to the second component 22. The third component 23, the second component 22 and the two first components 21 jointly define a first limiting space 20a. The first support component 30 is located in the first limiting space 20a and is detachably arranged on at least one fan-shaped part 12. A second limiting space 30a is formed between the first support component 30 and the second component 22. The second support component 40 is located in the first limiting space 20a and is detachably arranged on a fan-shaped portion 12. A third limiting space 40a is formed between the second support component 40 and the second component 22. The height of the second support component 40 is less than the height of the first support component 30. The third support component 50 can be selectively arranged on the upper side of the second support component 40. The lateral limiting member 60 is arranged on the same fan-shaped portion 12 as the second support component 40 and is arranged on the other side of the fan-shaped portion 12 close to the adapter portion 11. The lateral limiting member 60 is detachably connected to the fan-shaped portion 12.

[0029] The base 10 may refer to a basic support structure of a cavity electron beam welding device 100 for a proton cyclotron high frequency cavity, and the outer contour of the base 10 and the proton cyclotron high frequency cavity 200 are similar. The base 10 may be, but is not limited to, alloy steel, stainless steel, aluminum alloy, composite material, and the like. In the above scheme, the base 10 may include an adapter 11 and two fan-shaped portions 12, and the two fan-shaped portions 12 are respectively arranged on both sides of the adapter 11. The adapter 11 may refer to a hollow circular structure, which may be used to connect the structure of the two fan-shaped portions 12, ensure that the two fan-shaped portions 12 are rigidly connected, improve the overall stability, and avoid displacement caused by vibration during welding. At the same time, the adapter 11 is hollow inside, which can greatly reduce the material consumption of the adapter 11, making the cavity electron beam welding device 100 of the proton cyclotron high frequency cavity lighter, easy to carry, adjust or rotate, and can also save costs. The fan-shaped portion 12 may refer to a fan-shaped plate-like structure, which may have high strength and deformation resistance, and is used to support and install other components. The central axes of the adapter portion 11 and the fan-shaped portion 12 may be along the same straight line, and the connection method may be but is not limited to bolts or screws, mortise and tenon joints or clamping, integral molding and welding, etc. The base 10 adopts a structure including the adapter portion 11 and the fan-shaped portion 12 to better adapt to the structure of the lower cavity 210.

[0030] The limiting mechanism 20 may refer to the mechanism for limiting the lower cavity 210. The connection method between the limiting mechanism 20 and the sector portion 12 may be, but is not limited to, welding, bolt connection, riveting, etc. In the above solution, the limiting mechanism 20 can be divided into three parts, namely, including a first component 21, a second component 22, and a third component 23. The first component 21 is two and located on both sides of the sector portion 12 in the arc length direction, and can be used to limit the movement of the lower cavity 210 in the central axial direction of the sector portion 12. The second component 22 can be arranged along the arc length direction of the sector portion 12, and can be used to limit the movement of the lower cavity 210 in the central axial direction and the radial direction of the sector portion 12. The third component 23 may refer to an arc-shaped strip structure, which is detachably arranged above the second component 22, and can be used to limit the movement of the lower cavity 210 in the central axial direction of the sector portion 12 (which may refer to Figure 2 the up and down direction).

[0031] The first support component 30, the second support component 40, the third support component 50, and the lateral limiting member 60 may refer to the structures for supporting and fixing the lower cavity 210 and the inner conductor 220. The height of the second support component 40 is less than the height of the first support component 30, and can respectively carry different components of the high-frequency cavity 200 of the proton cyclotron. For example, the first support component 30 and the third support component 50 support the lower cavity 210, and the second support component 40 supports the inner conductor 220. By layer-by-layer positioning, the center of gravity of the overall structure is reduced, the stability during welding is improved, the deformation caused by vibration or stress concentration is reduced, and the reliability of welding is improved. The third support component 50 can be selectively arranged on the upper side of the second support component 40 as needed, which can enhance the support for the special structure components in the high-frequency cavity 200 of the proton cyclotron, achieve on-demand configuration, and further improve the reliability of welding.

[0032] The lateral limiting member 60 can support and fix the inner conductor 220, and is used to limit the movement of the inner conductor 220 in the radial direction of the sector portion 12 (which may refer to Figure 2 the left and right direction), further improving the stability of welding. Among them, the lateral limiting member 60 is detachably connected to the sector portion 12, and can be flexibly adjusted in position or disassembled, which is convenient to operate.

[0033] In the above technical solution, referring to Figures 2 to 5, when the cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity is in use, first place the inner conductor 220 in the first limiting space 20a on the right side. The first conductor part 2201 of the inner conductor 220 is supported on the second supporting member 40. Then, limit the left side of the first conductor part 2201 with the lateral limiting member 60. Next, place the third supporting member 50 on the second conductor part 2202. Immediately afterwards, install the lower cavity 210. The bottom shell wall 201 is placed in the two first limiting spaces 20a. The left sector wall segment 2012 is placed on the first supporting member 30, and the right sector wall segment 2012 is placed on the third supporting member 50. Then, place one side shell wall 202 in the second limiting space 30a on the left side, and place the other side shell wall 202 in the third limiting space 40a on the right side.

[0034] After installing the lower cavity 210 and the inner conductor 220 onto the cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity, on the left side of the device, the first supporting member 30 and the third member 23 can limit the up and down direction of the sector wall segment 2012. The two first members 21 can limit the front and back direction of the sector wall segment 2012. The second member 22 can limit the left and right direction of the sector wall segment 2012. On the right side of the device, the second supporting member 40, the third supporting member 50 and the third member 23 can limit the up and down direction of the sector wall segment 2012 and the inner conductor 220. The two first members 21 can limit the front and back direction of the sector wall segment 2012. The lateral limiting member 60 and the second member 22 can limit the left and right direction of the inner conductor 220 and the sector wall segment 2012.

[0035] It can be understood that the lower cavity 210 and the inner conductor 220 can be fixed together by the cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity. Thus, only one welding tooling is required. After one-time assembly, the welding between the two sector wall segments 2012 and the two side shell walls 202 of the lower cavity 210, and the welding between the second conductor part 2202 of the inner conductor 220 and the side shell wall 202 can be achieved simultaneously. Moreover, these welding processes only need to enter the vacuum chamber once and do not need to enter and exit the vacuum chamber frequently, which can improve the welding efficiency.

[0036] The cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity according to the embodiments of the present invention can achieve precise assembly and positioning of multiple components of the lower cavity 210, as well as precise assembly and positioning of the inner conductor 220 and the lower cavity 210 through the limiting mechanism 20, the first support member 30, the second support member 40, the third support member 50, and the lateral limiting member 60. This is beneficial for reducing the number of welding toolings, reducing human operation errors. Moreover, the above device can position the inner conductor 220 and the lower cavity 210 more precisely, reducing the risk of welding deformation during the welding process, improving the welding quality and the performance stability of the welded finished product. The above device can also reduce the assembly steps and the number of times of entering the vacuum chamber, and can achieve one-time welding of multiple welds in the vacuum chamber, improving the welding efficiency. Moreover, it can also be used as a post-welding shape-retaining tooling, having better applicability.

[0037] In some embodiments of the present invention, referring to Figures 3 to 5 , the first component 21 includes a plurality of first limiting members 211, and the plurality of first limiting members 211 are arranged at intervals along the radial direction of the fan-shaped portion 12; the first limiting member 211 includes a fixing portion 2111 and a clamping portion 2112, the fixing portion 2111 is provided on the fan-shaped portion 12, and a clamping groove 211a is formed between the clamping portion 2112 and the fixing portion 2111. The clamping groove 211a is open towards the side of the first limiting space 20a, and the clamping portion 2112 is movably arranged on the fixing portion 2111 in the vertical direction.

[0038] The number of the first limiting members 211 can be, but is not limited to, two, four, six, eight, ten, twelve, fourteen, sixteen, eighteen, twenty, twenty-two, etc. The fixing portion 2111 can refer to the structure for connecting the fan-shaped portion 12 and the clamping portion 2112, and can be, but is not limited to, materials such as cast steel, alloy steel, stainless steel, and aluminum alloy, etc. The "vertical direction" can refer to Figure 2 the up and down direction.

[0039] The clamping portion 2112 can refer to an L-shaped structure. A clamping groove 211a is formed between the clamping portion 2112 and the fixing portion 2111, and the clamping groove 211a is open towards the side of the first limiting space 20a. The first flanging 20121 of the fan-shaped wall segment 2012 (see Figure 1 ) can be placed into the clamping groove 211a from the open direction, and the fan-shaped wall segment 2012 is pressed by moving the clamping portion 2112 in the vertical direction, thereby restricting the movement of the fan-shaped wall segment 2012 in the vertical direction.

[0040] In the above technical solution, the clamping portion 2112 can move and cooperate with the fixing portion 2111 to form an adjustable clamping groove 211a, which restricts the movement of the sector wall segment 2012 of the lower cavity 210, prevents thermal deformation displacement and ensures weld alignment, thereby improving the reliability of welding. A plurality of first limiting members 211 are arranged at intervals in the radial direction of the sector portion 12. Through multi-point distributed limiting, the sector wall segment 2012 can be limited, and the positioning error of the sector wall segment 2012 can be controlled within an extremely small range, further improving the reliability of welding.

[0041] In some embodiments of the present invention, referring to Figure 6 , the clamping portion 2112 includes a connected connecting segment 21121 and a clamping segment 21122. The connecting segment 21121 is arranged on the side of the fixing portion 2111 away from the first limiting space 20a. The connecting segment 21121 is provided with a first strip-shaped hole 21121a, and the fixing portion 2111 is provided with a first adjusting bolt 21111. The first adjusting bolt 21111 passes through the first strip-shaped hole 21121a, and the clamping segment 21122 is arranged on the upper side of the fixing portion 2111.

[0042] The connecting segment 21121 may refer to the structure connecting the clamping segment 21122 and the fixing portion 2111. The first strip-shaped hole 21121a may refer to a long strip-shaped hole, the length of which can determine the adjustment range, and the length direction can determine the adjustment direction.

[0043] In the above technical solution, the first strip-shaped hole 21121a of the connecting segment 21121 and the first adjusting bolt 21111 of the fixing portion 2111 form a movable connection. The operator only needs to loosen the bolt, and then the clamping portion 2112 can be moved up and down along the direction of the strip-shaped hole to quickly adjust the opening height of the clamping groove 211a to complete the positioning adjustment. The operation is simple, which can improve the welding efficiency. At the same time, the structure is simple, which can reduce the cost.

[0044] In some embodiments of the present invention, referring to Figures 2 to 5 and Figure 8 , the second component 22 includes a plurality of adjustable limiting members 221 and a plurality of fixed limiting members 222. The plurality of adjustable limiting members 221 and the plurality of fixed limiting members 222 are arranged at intervals along the arc length direction. The fixed limiting member 222 is provided with a clamping groove 222a that is open toward the first limiting space 20a. The adjustable limiting member 221 is movably arranged on the sector portion 12 in the radial direction of the sector portion 12, and the adjustable limiting member 221 and the fixed limiting member 222 are arranged at intervals in the radial direction.

[0045] The adjustable limiting member 221 may refer to a mechanism that can move radially along the sector portion 12, and the number may be, but is not limited to, two, four, six, eight, ten, twelve, fourteen, sixteen, eighteen, twenty, twenty-two, and so on. The fixed limiting member 222 may refer to a mechanism that is fixed on the sector portion 12 and cannot move, and the number may be, but is not limited to, two, four, six, eight, ten, twelve, fourteen, sixteen, eighteen, twenty, twenty-two, and so on. For example, referring to Figure 2 , there are four adjustable limiting members 221 and also four fixed limiting members 222. The four fixed limiting members 222 are divided into two groups, with two in each group. The two groups of fixed limiting members 222 are arranged on both sides of the adjustable limiting members 221.

[0046] In the above technical solution, the card slot 222a of the fixed limiting member 222 opens towards the first limiting space 20a, and can precisely hold the first flanging 20121 of the sector wall segment 2012 to form a rigid positioning reference, ensuring the initial position accuracy of the sector wall segment 2012. The adjustable limiting members 221 distributed at intervals along the arc length direction can further restrict the movement of the sector wall segment 2012 and the side shell wall 202 in the radial direction of the sector portion 12, apply radial constraint forces at the circumferential discrete points to form a "ring-shaped dot matrix" limiting effect, make the radial clamping force evenly distributed along the circumference, avoid local overload, and can also ensure the positioning stability, thereby guaranteeing the stability of welding.

[0047] In some embodiments of the present invention, referring to Figure 7 , the adjustable limiting member 221 includes a first part 2211 and a second part 2212 that are vertically connected. The first part 2211 is provided with a second strip-shaped hole 2211a, and the sector portion 12 is provided with a second adjusting bolt 121. The second adjusting bolt 121 passes through the second strip-shaped hole 2211a. The second part 2212 is perpendicular to the sector portion 12, and a relief groove 2212a is provided on the side close to the limiting space.

[0048] The second strip-shaped hole 2211a may refer to a long strip-shaped hole, and the length can determine the adjustment range, and the length direction can determine the adjustment direction. The adjustable limiting member 221 can be moved by the position of the second adjusting bolt 121 in the second strip-shaped hole 2211a. The relief groove 2212a may refer to a groove structure that plays a role in avoiding, and can avoid the second flanging 2021 of the side shell wall 202 (see Figure 1 ).

[0049] In the above technical solution, the first part 2211 and the second part 2212 can be vertically connected, so that the second part 2212 can form a clamping surface in a plane perpendicular to the fan-shaped part 12. Through the cooperation of the second strip-shaped hole 2211a of the first part 2211 and the second adjusting bolt 121 of the fan-shaped part 12, the adjustable limiting member 221 is allowed to move in the radial direction of the fan-shaped part 12, and the movement of the fan-shaped wall segment 2012 and the side shell wall 202 in the radial direction of the fan-shaped part 12 can be restricted. At the same time, a three-dimensional spatial constraint can be formed with the clamping groove 222a of the fixed limiting member 222 to provide auxiliary limiting in the height direction and prevent the fan-shaped wall segment 2012 from tilting up and down, thereby improving the reliability of the adjustable limiting member 221. The avoidance groove 2212a can avoid the second flanging 2021 of the side shell wall 202 to prevent interference with the side shell wall 202.

[0050] In some embodiments of the present invention, referring to Figure 2 and Figure 4 , the third component 23 is an arc-shaped long strip extending along the arc length direction. In the above technical solution, the arc-shaped long strip structure extends along the arc length direction of the fan-shaped part 12, and can form a continuous surface contact with the high-frequency cavity 200 of the proton cyclotron, restricting the movement of the lower cavity 210 in the central axis direction of the fan-shaped part 12 and improving the welding accuracy.

[0051] In some embodiments of the present invention, referring to Figure 2 , Figure 3 and Figure 5 , the fan-shaped part 12 is provided with inspection openings 12a; there are multiple inspection openings 12a, and the multiple inspection openings 12a are arranged at intervals along the arc length direction of the fan-shaped part 12, and each inspection opening 12a extends in the radial direction of the fan-shaped part 12.

[0052] The inspection openings 12a can be provided on the fan-shaped part 12 with the second support member 40, or both fan-shaped parts 12 can be provided with inspection openings 12a. The number of inspection openings 12a can be, but is not limited to, two, four, six, eight, ten, twelve, fourteen, sixteen, eighteen, twenty, twenty-two, etc. At the same time, the sizes of the inspection openings 12a can be inconsistent or consistent.

[0053] In the above technical solution, by providing the inspection openings 12a on the fan-shaped part 12, it is convenient for the handheld probe of the laser tracker to extend into the internal part of the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron. The external dimensions can be monitored in real time during the assembly process to ensure the precise assembly and positioning of the internal components before welding, improve the welding accuracy, and further improve the welding reliability. Moreover, it can also be used for post-weld inspection, which can also ensure the welding quality and improve the welding reliability. At the same time, the inspection openings 12a can also reduce the weight of the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron and save materials.

[0054] In some embodiments of the present invention, reference Figure 5 and Figure 9 The lateral limiting member 60 includes a positioning pin 61 and a limiting block 62 . The positioning pin 61 and the limiting block 62 are detachably arranged on the fan-shaped portion 12 . The limiting block 62 is arranged on a side of the positioning pin 61 close to the adapter portion 11 .

[0055] The positioning pin 61 may be a cylindrical structure, which is detachably provided on the sector portion 12. Optionally, the sector portion 12 and the first conductor portion 2201 of the inner conductor 220 may have reserved holes, and the positioning pin 61 may be inserted into the corresponding reserved holes to achieve a detachable connection with the sector portion 12 and the first conductor portion 2201. The limit block 62 may be a block structure, which is movably and detachably provided on the sector portion 12.

[0056] In the above technical solution, the positioning pin 61 is used as a positioning element, and by cooperating with the holes of the sector-shaped portion 12 and the first conductor portion 2201, the first conductor portion 2201 can be limited in the radial direction of the sector-shaped portion 12. Similarly, the limiting block 62 can abut against one end of the first conductor portion 2201, further limiting the first conductor portion 2201 in the radial direction of the sector-shaped portion 12. In other words, the positioning pin 61 and the limiting block 62 can realize combined limiting, thereby accurately fixing and limiting the inner conductor 220, and improving the reliability of welding.

[0057] In some embodiments of the present invention, reference Figure 2 and Figure 3 The first supporting member 30 includes a plurality of first plates 31, which are spaced apart along the arc length direction; the second supporting member 40 includes a plurality of second plates 41, which are spaced apart along the arc length direction.

[0058] In the above technical solution, by setting the first support member 30 and the second support member 40 into the above structure, the structure of the first support member 30 and the second support member 40 can be simplified, which is convenient for processing and manufacturing, and the size and weight of the first support member 30 and the second support member 40 can be reduced, thereby reducing the weight of the entire welding device and facilitating the transportation and disassembly and installation of the welding device. On the other hand, the structure of the first plate 31 and the second plate 41 arranged at intervals is similar to the "reinforcement rib" and can improve the strength of the base 10, thereby improving the reliability of the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron. At the same time, the gaps arranged at intervals can allow the structure to produce slight elastic deformation, absorb dynamic impact energy, and extend the service life.

[0059] In some embodiments of the present invention, reference Figure 4The adapter 11 is provided with a mounting hole 11a, and the mounting hole 11a is configured to be used for mounting a rotating component. The rotating component may refer to a rotatable device, such as a rotating mechanical arm, a rotating mechanism, and the like.

[0060] It can be understood that since the workpiece formed by the lower cavity 210 and the inner conductor 220 has many welds, and multiple welds are distributed on the upper surface and side surfaces of the workpiece, the mounting hole 11a of the adapter 11 is installed in cooperation with the rotating component. After entering the vacuum chamber once, the welding device can be driven to rotate as a whole through the rotating component, thereby conveniently adjusting the posture of the workpiece, realizing the welding requirements of multi-angle and multi-pass welds, and making the electron beam gun head closer to the welding area, which is suitable for annular welds.

[0061] refer to Figure 10 The cavity electron beam welding method of the proton cyclotron high-frequency cavity 200 according to the embodiment of the present invention comprises the cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity of any of the above embodiments. The method comprises: Step S1, using the cavity electron beam welding device 100 of the proton cyclotron high frequency cavity to fix the sector wall segment 2012, the side shell wall 202 and the inner conductor 220; Step S2 , placing the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron into the vacuum chamber, welding the sector wall segment 2012 and the side shell wall 202 , and welding the side shell wall 202 and the inner conductor 220 .

[0062] According to the cavity electron beam welding method of the proton cyclotron high-frequency cavity 200 of the embodiment of the present invention, the sector wall segment 2012, the side shell wall 202 and the inner conductor 220 are placed in the cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity, and the adjustable stopper 221 and the first stopper 211 are adjusted to fix the sector wall segment 2012, the side shell wall 202 and the inner conductor 220. Then, the cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity is placed in the vacuum chamber, and the sector wall segment 2012 and the side shell wall 202 are welded, and the side shell wall 202 and the inner conductor 220 are welded. All welding can be completed at one time, avoiding entering the vacuum chamber again, reducing the number of tooling for welding the cavity electron beam of the proton cyclotron high-frequency cavity 200, improving the utilization rate of the tooling, and saving costs.

[0063] In some embodiments of the present invention, reference Figure 11 The steps of fixing the sector wall segment 2012, the side shell wall 202 and the inner conductor 220 by using the cavity electron beam welding device 100 of the high frequency cavity of the proton cyclotron accelerator include: Place the inner conductor 220 on the second support member 40 and limit and cooperate with the lateral limiting member 60, and align the hole position of the inner conductor 220 with the lateral limiting member 60, and place the third support member 50 on the inner conductor 220; Invert the bottom shell wall 201 so that one of the two sector wall segments 2012 is supported on the first support member 30 and limit and cooperate with the corresponding first limiting member 211, and the other of the two sector wall segments 2012 is supported on the third support member 50 and limit and cooperate with the corresponding first limiting member 211; Place the two side shell walls 202 into the second limiting space 30a and the third limiting space 40a respectively, and install the third member 23 on the second member 22 to limit the top of the sector wall segment 2012.

[0064] In the above technical solution, placing the inner conductor 220 on the second support member 40 and limit and cooperate with the lateral limiting member 60, and aligning the hole position of the inner conductor 220 with the lateral limiting member 60, and placing the third support member 50 on the inner conductor 220 can limit the movement of the inner conductor 220. Inverting the bottom shell wall 201 so that one of the two sector wall segments 2012 is supported on the first support member 30 and limit and cooperate with the corresponding first limiting member 211, and the other of the two sector wall segments 2012 is supported on the third support member 50 and limit and cooperate with the corresponding first limiting member 211 can limit the movement of the bottom shell wall 201. Placing the two side shell walls 202 into the second limiting space 30a and the third limiting space 40a respectively, and installing the third member 23 on the second member 22 to limit the top of the sector wall segment 2012 can limit the movement of the side shell wall 202, and at the same time ensure the installation position of the inner conductor 220 on the side shell wall 202, and ensure that the sector wall segment 2012, the side shell wall 202 and the inner conductor 220 can be stably fixed and flipped at multiple angles on the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron, improving the welding reliability.

[0065] In some embodiments of the present invention, referring to Figure 12 , the steps of fixing the sector wall segment 2012, the side shell wall 202 and the inner conductor 220 by using the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron may further include: Install the two sector portions 12 on the first support member 30, and remove the second support member 40, the third support member 50, and the lateral limiting member 60; Support the two sector wall segments 2012 of the bottom shell wall 201 on the corresponding first support member 30 and limit and cooperate with the corresponding first member 21; Place the two side shell walls 202 into the two second limiting spaces 30a respectively, and install the third member 23 on the second member 22 to limit the top of the sector wall segment 2012; The cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron accelerator is placed in the vacuum chamber, and the fan-shaped wall segments 2012 of the side shell wall 202 and the bottom shell wall 201 are welded; Take out the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron accelerator, remove the welded lower cavity 210, and adjust the two fan-shaped parts 12 so that one is installed with the first support component 30 and the other is installed with the second support component 40 and the lateral stopper 60; The inner conductor 220 is placed on the second support member 40 and is limitedly matched with the lateral limit member 60, and the hole position of the inner conductor 220 is matched with the lateral limit member 60, and the third support member 50 is placed on the inner conductor 220; The lower cavity 210 is reinstalled on the cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron accelerator, and supported on the third supporting component 50 and the first supporting component 30, and is limitedly matched with the corresponding first component 21, and the third component 23 is installed on the second component 22 to limit the top of the fan-shaped wall segment 2012; The cavity electron beam welding device 100 of the high-frequency cavity of the proton cyclotron is put into the vacuum chamber again, and the inner conductor 220 and the corresponding side shell wall 202 are welded.

[0066] In the above technical solution, the fan-shaped wall segments 2012 of the side shell wall 202 and the bottom shell wall 201, the inner conductor 220 and the corresponding side shell wall 202 can be welded separately, and only two times of entering the vacuum chamber are required, which can reduce the number of times of welding the cavity electron beam tooling of the high-frequency cavity 200 of the proton cyclotron accelerator, improve the utilization rate of the tooling, and save costs.

[0067] Combine the following Figures 2 to 9 , describing a specific embodiment of the cavity electron beam welding device 100 of the proton cyclotron high-frequency cavity of the present invention.

[0068] The cavity electron beam welding device 100 of the high-frequency cavity of a proton cyclotron accelerator comprises: a base 10 , a limiting mechanism 20 , a first supporting component 30 , a second supporting component 40 , a third supporting component 50 and a lateral limiting member 60 .

[0069] The base 10 includes an adapter portion 11 and two fan-shaped portions 12, and the two fan-shaped portions 12 are connected via the adapter portion 11. The fan-shaped portion 12 provided with the second support member 40 is provided with four inspection ports 12a, which are arranged at intervals along the arc length direction of the fan-shaped portion 12, and each inspection port 12a extends along the radial direction of the fan-shaped portion 12.

[0070] The limiting mechanism 20 is arranged on the two fan-shaped parts 12, and the limiting mechanism 20 includes a first component 21, a second component 22 and a third component 23. There are two first components 21 and they are arranged on both sides of the arc length direction of the fan-shaped part 12, the second component 22 is arranged on the side of the fan-shaped part 12 away from the adapter 11, the third component 23 is located on the upper side of the second component 22, and is detachably connected to the second component 22, and the third component 23, the second component 22 and the two first components 21 jointly define a first limiting space 20a.

[0071] The first component 21 includes a plurality of first limiting members 211, which are arranged at intervals along the radial direction of the sector 12. The first limiting member 211 includes a fixing portion 2111 and a clamping portion 2112, the fixing portion 2111 is arranged on the sector 12, a clamping groove 211a is formed between the clamping portion 2112 and the fixing portion 2111, the clamping groove 211a is open toward one side of the first limiting space 20a, and the clamping portion 2112 is movably arranged on the fixing portion 2111 along the vertical direction. The clamping portion 2112 includes a connected connecting section 21121 and a clamping section 21122. The connecting section 21121 is arranged on the side of the fixing portion 2111 away from the first limiting space 20a. The connecting section 21121 is provided with a first strip hole 21121a. The fixing portion 2111 is provided with a first adjusting bolt 21111. The first adjusting bolt 21111 is passed through the first strip hole 21121a. The clamping section 21122 is arranged on the upper side of the fixing portion 2111.

[0072] The second component 22 includes a plurality of adjustable stoppers 221 and a plurality of fixed stoppers 222, the plurality of adjustable stoppers 221 and the plurality of fixed stoppers 222 are arranged at intervals along the arc length direction, the fixed stoppers 222 are provided with a slot 222a open toward one side of the first limit space 20a, the adjustable stoppers 221 are movably arranged on the fan-shaped portion 12 along the radial direction of the fan-shaped portion 12, and the adjustable stoppers 221 and the fixed stoppers 222 are arranged at intervals along the radial direction. The adjustable stopper 221 includes a first portion 2211 and a second portion 2212 connected vertically, the first portion 2211 is provided with a second strip hole 2211a, the fan-shaped portion 12 is provided with a second adjusting bolt 121, the second adjusting bolt 121 is penetrated through the second strip hole 2211a, the second portion 2212 is perpendicular to the fan-shaped portion 12, and a side close to the limit space is provided with an avoidance groove 2212a.

[0073] The third component 23 is in the shape of an arc-shaped strip extending along the arc length direction.

[0074] The first support component 30 is located in the first limiting space 20a and is detachably arranged on a sector 12, and a second limiting space 30a is formed between the first support component 30 and the second component 22. The first support component 30 includes five first plates 31, and the five first plates 31 are arranged at intervals along the arc length direction; The second support component 40 is located in the first limiting space 20a and is detachably arranged on the other sector 12. A third limiting space 40a is formed between the second support component 40 and the second component 22. The height of the second support component 40 is less than the height of the first support component 30. The second support component 40 includes three second plates 41, which are spaced apart along the arc length direction.

[0075] The third supporting member 50 is a supporting block, and is provided on the upper side of the second supporting member 40 .

[0076] The lateral stopper 60 and the second support member 40 are arranged on the same sector 12 and on the other side of the sector 12 close to the adapter 11. The lateral stopper 60 is detachably connected to the sector 12. The lateral stopper 60 includes a positioning pin 61 and a stopper block 62. The positioning pin 61 and the stopper block 62 are detachably arranged on the sector 12. The stopper block 62 is arranged on one side of the positioning pin 61 close to the adapter 11.

[0077] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0078] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electron beam welding device for the cavity of a proton cyclotron high-frequency cavity, characterized in that, include: The base comprises a transfer portion and two fan-shaped portions, wherein the two fan-shaped portions are connected via the transfer portion; A limiting mechanism, wherein the two fan-shaped portions are both provided with the limiting mechanism, and the limiting mechanism comprises a first component, a second component and a third component, wherein the first components are two and are arranged on both sides of the fan-shaped portion in the arc length direction, the second component is arranged on a side of the fan-shaped portion away from the adapter portion, the third component is located on the upper side of the second component and is detachably connected to the second component, and the third component, the second component and the two first components jointly define a first limiting space; a first supporting component, located in the first limiting space and detachably arranged on at least one of the fan-shaped parts, wherein a second limiting space is formed between the first supporting component and the second component; a second supporting component, located in the first limiting space and detachably arranged on one of the fan-shaped parts, a third limiting space being formed between the second supporting component and the second component, and a height of the second supporting component being smaller than a height of the first supporting component; a third support member, optionally arranged on an upper side of the second support member; The lateral limiting member is arranged on the same fan-shaped portion as the second supporting member and is arranged on the other side of the fan-shaped portion close to the adapter portion. The lateral limiting member is detachably connected to the fan-shaped portion.

2. The cavity electron beam welding device for the high-frequency cavity of the proton cyclotron according to claim 1, characterized in that, The first component includes a plurality of first limiting members, which are arranged at intervals along the radial direction of the fan-shaped portion; the first limiting member includes a fixing portion and a clamping portion, the fixing portion is arranged on the fan-shaped portion, a clamping groove is arranged between the clamping portion and the fixing portion, the clamping groove is open toward one side of the first limiting space, and the clamping portion is movably arranged on the fixing portion along the vertical direction.

3. The cavity electron beam welding device for the high-frequency cavity of the proton cyclotron according to claim 2, characterized in that, The clamping portion includes a connected connecting section and a clamping section, the connecting section is arranged on a side of the fixing portion away from the first limiting space, the connecting section is provided with a first strip hole, the fixing portion is provided with a first adjusting bolt, the first adjusting bolt is passed through the first strip hole, and the clamping section is arranged on the upper side of the fixing portion.

4. The cavity electron beam welding device for the high-frequency cavity of the proton cyclotron according to claim 1, characterized in that, The second component includes a plurality of adjustable limit members and a plurality of fixed limit members, the plurality of adjustable limit members and the plurality of fixed limit members are spaced apart along the arc length direction, the fixed limit member is provided with a slot open toward one side of the first limit space, the adjustable limit member is movably provided on the fan-shaped portion along the radial direction of the fan-shaped portion, and the adjustable limit member and the fixed limit member are spaced apart along the radial direction.

5. The cavity electron beam welding device for the high-frequency cavity of the proton cyclotron according to claim 4, wherein, The adjustable limit member includes a first part and a second part which are vertically connected, the first part is provided with a second strip hole, the fan-shaped part is provided with a second adjusting bolt, the second adjusting bolt is passed through the second strip hole, the second part is perpendicular to the fan-shaped part, and an avoidance groove is provided on one side close to the limit space.

6. The cavity electron beam welding device for the high-frequency cavity of the proton cyclotron according to claim 1, characterized in that, The third component is in the shape of an arc-shaped strip extending along the arc length direction.

7. The cavity electron beam welding device for the high-frequency cavity of the proton cyclotron according to claim 1, wherein The sector-shaped portion is provided with an inspection port; there are multiple inspection ports, which are arranged at intervals along the arc length direction of the sector-shaped portion, and each inspection port extends along the radial direction of the sector-shaped portion.

8. The electron beam welding device for the cavity of the high-frequency cavity of the proton cyclotron according to claim 1, wherein The lateral limiting member comprises a positioning pin and a limiting block. The positioning pin and the limiting block are detachably arranged on the fan-shaped portion. The limiting block is arranged on a side of the positioning pin close to the adapter portion.

9. The cavity electron beam welding device for the high-frequency cavity of the proton cyclotron according to claim 1, characterized in that, The first supporting component includes a plurality of first plates, which are spaced apart along the arc length direction; the second supporting component includes a plurality of second plates, which are spaced apart along the arc length direction.

10. A cavity electron beam welding method for a proton cyclotron high-frequency cavity, comprising the cavity electron beam welding device for a proton cyclotron high-frequency cavity as claimed in any one of claims 1 to 9; the proton cyclotron high-frequency cavity comprises a lower cavity and an inner conductor, the lower cavity comprises a bottom shell wall and two side shell walls, the bottom shell wall comprises two fan-shaped wall segments, one end of each fan-shaped wall segment in a radial direction is open and forms an opening, and the side shell wall covers the opening; the method comprises: The sector-shaped wall segment, the side shell wall and the inner conductor are fixed by using the cavity electron beam welding device of the high-frequency cavity of the proton cyclotron accelerator; The cavity electron beam welding device of the proton cyclotron high-frequency cavity is placed into a vacuum chamber, and the fan-shaped wall segment and the side shell wall are welded, and the side shell wall and the inner conductor are welded.

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