CN210745640U - Position adjusting mechanism special for rigid ion source in cyclotron - Google Patents

Abstract

The utility model discloses a special position adjusting mechanism for a rigid ion source in a cyclotron, wherein a first guide rail is arranged in a support frame, a first driving device is arranged outside the support frame, the first driving device is connected with a first transmission device, and the first transmission device is connected with the first guide rail; the supporting frame is fixedly provided with a first flange used for being fixed with an accelerator shell, the first guide rail is connected with a second guide rail, the second guide rail is provided with a second flange and a second driving device, the second driving device is connected with the second flange, and the moving direction of the second flange is perpendicular to that of the first guide rail. The utility model discloses install outside the vacuum, its volume size does not receive accelerator inner space's restriction, can realize complicated and accurate multidimensional motion control. The bearing, the lead screw and the guide rail are not limited by oil when the bearing, the lead screw and the guide rail are installed outside vacuum. The transmission mechanism, the driving motor, the signal wire, the power wire and the like are all arranged outside the accelerator, and the type selection and the design are not limited by the vacuum condition any more.

Description

Position adjusting mechanism special for rigid ion source in cyclotron

Technical Field

The utility model relates to a cyclotron technical field, concretely relates to be exclusively used in position control mechanism of rigidity ion source in cyclotron.

Background

When the cyclotron accelerates charged particles, the charged particle beam current has an external generation type and an internal generation type, namely an external ion source and an internal ion source. Compared with an outer ion source, the cyclotron adopting the inner ion source has the advantages of more compact integral structure, relatively simple equipment structure and far lower manufacturing cost and maintenance cost than the outer ion source.

The inner ion source needs to be maintained and disassembled periodically, and the relative position of the inner ion source is not easy to fix. The accelerator is extremely sensitive to the position of the internal ion source, and usually requires an on-line adjustment of a corresponding position adjusting mechanism. The environment of the internal ion source is inside the accelerator, and generally, a relatively high radiation dose exists, so that the internal ion source is inconvenient to enter the accelerator to complete corresponding operation. Opening and lifting the accelerator can also cause other adverse effects.

In order to adjust the position of the ion source, a position adjusting mechanism is usually installed inside the accelerator and near the ion source discharge chamber, and the ion source is fixed on the position adjusting mechanism by means of screws or the like. Meanwhile, the ion source is also required to be externally connected with water, electricity, gas and other pipelines, so that the whole ion source is flexible, can be bent, stretched and the like to a certain degree, and is not damaged when the current position adjusting mechanism drives the ion source to move.

There are two significant disadvantages to this structure: firstly, the ion source is fixed on a displacement platform in the accelerator, and the accelerator is required to be opened to be disassembled and then the ion source is disassembled after entering the accelerator. The radiation dose that the personnel need to bear, the time that the dismantlement needs is also longer. Secondly, the internal space of the accelerator is narrow and small, which is not convenient for the installation of the multidimensional displacement control console. The device is arranged in the accelerator, and the displacement stroke is limited by the internal space of the accelerator, so that the device is inconvenient to adjust in a large range. Therefore, designers have considered whether to rigidly design the ion source, but after the rigid ion source is designed, how to adjust the position of the rigid ion source is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that current flexible ion source is located inside the accelerator, it is long when personnel dismantle, radiation hazard is big simultaneously, and accelerator inner space is narrow and small, make the control range little, the stroke of displacement is also restricted, be not convenient for adjust on a large scale, make the regulation precision low, thereby a position control mechanism who is exclusively used in rigid ion source in the cyclotron is provided, this adjustment mechanism combines rigid ion source and installs outside the accelerator, the accuracy nature of its displacement has been guaranteed, the vacuum outer mounting is fixed, make it can not dismantle fast by the restriction of accelerator state, adjustment mechanism's volume size does not receive accelerator inner space's restriction, can realize complicated and accurate multidimensional motion control.

The utility model discloses a following technical scheme realizes: the position adjusting mechanism special for the rigid ion source in the cyclotron comprises a support frame, wherein a first guide rail is arranged in the support frame, a first driving device is arranged outside the support frame, the first driving device is connected with a first transmission device, the first transmission device is connected with the first guide rail, and the first driving device can drive the first guide rail to move along the axis direction of the first guide rail through the first transmission device; the supporting frame is fixed with a first flange used for being fixed with an accelerator shell, a second guide rail is connected to the first guide rail, a second flange and a second driving device are arranged on the second guide rail, the second guide rail is arranged between the first flange and the second flange, the second driving device is connected with a second transmission device, the second transmission device is connected with the second flange, the second driving device can drive the second flange to move along the second guide rail through the second transmission device, and the moving direction of the second flange is perpendicular to the moving direction of the first guide rail.

Currently, flexible ion sources are generally used, fixed in vacuum. The ion source is fixed on a displacement platform in the accelerator, the accelerator needs to be opened to finish the disassembly of the ion source, the whole disassembly process is long in time consumption, and personnel need to bear long-time radiation dose, so that the harm to the body of the personnel is caused. Meanwhile, due to the design of a manufacturing process and a spatial pattern, the size of the space inside the accelerator is not too large, but the ion source needs to be moved to adjust the position, and the structural and functional requirements cause the displacement stroke of the ion source to be limited, so that the ion source is inconvenient to adjust in a large range. Meanwhile, the installed displacement platform can only be limited and cannot be subjected to multi-dimensional adjustment, so that the adjustment precision is very low, the displacement platform and all the mechanisms attached to the displacement platform are installed in an accelerator and are limited by space and vacuum, a strong magnetic field and a radio frequency electric field, the displacement platform is mostly of a separation type, the structure is complex, one-dimensional motion control is realized, and the stroke is limited. The device comprises a support frame, wherein a first guide rail is arranged in the support frame, a first driving device is arranged outside the support frame, the first driving device is connected with a first transmission device, the first transmission device is connected with the first guide rail, and the first driving device can drive the first guide rail to move along the axis direction of the first guide rail through the first transmission device; the supporting frame is further fixed with a first flange used for being fixed with an accelerator shell, a second guide rail is connected to the first guide rail, a second flange and a second driving device are arranged on the second guide rail, the second driving device is connected with a second transmission device, the second transmission device is connected with the second flange, the second driving device can drive the second flange to move along the second guide rail through the second transmission device, and the moving direction of the second flange is perpendicular to the moving direction of the first guide rail. The scheme combines the requirement of adjusting the position of the rigid ion source, and realizes multidimensional adjustment by using the driving device, wherein the driving device I is used for large-range adjustment, the driving device II is used for small-range adjustment, and the two adjustment directions are vertically arranged, so that the requirement can be met during adjustment. The scheme is installed outside vacuum, the volume size of the accelerator is not limited by the internal space of the accelerator, and complex and accurate multi-dimensional motion control can be realized. The device is installed outside vacuum, the lubrication of the moving parts is not limited by oil, and various lubrication modes can be adopted. The accelerator is installed outside vacuum, the components of the accelerator are all outside the accelerator, and the selection and the design are not limited by the vacuum condition any more. Thereby increasing the variety of the selection of the components, improving the service life and reducing the cost.

In order to ensure the vacuum environment inside the cyclotron and avoid the damage of vacuum caused by the connection with an external ion source, a corrugated pipe is arranged between the second guide rail and the first flange, and the two ends of the corrugated pipe are respectively connected with the second guide rail and the first flange in a seamless mode. The corrugated pipe is a tubular elastic sensitive element which is formed by connecting foldable corrugated sheets along the folding and stretching direction. The corrugated pipe has wide application in instruments and meters, and is mainly used as a measuring element of a pressure measuring instrument to convert pressure into displacement or force. The corrugated pipe has thin pipe wall and high sensitivity, and the measurement range is from tens of Pa to tens of MPa. The structure of the present bellows of this scheme utilization realizes deformation when guide rail two moves along with guide rail one, guarantees that the gap can not appear between guide rail two and the flange one and lead to the inside vacuum environment of accelerator to change.

In order to enable the structure to be compact and simultaneously ensure that interference cannot occur during movement, the second guide rail, the first flange, the second flange and the corrugated pipe are arranged outside the support frame.

The first transmission device is preferably a first lead screw, one end of the first lead screw is connected with the first driving device, the other end of the first lead screw penetrates through the first guide rail and then is inserted into the support frame, the first lead screw can rotate around the axis of the first lead screw, and the first lead screw is long in size so as to realize adjustment in a large range; the second transmission device is preferably a second lead screw, one end of the second lead screw is connected with the second driving device, the other end of the second lead screw is connected with the second flange, the second lead screw can rotate around the axis of the second lead screw, and the second lead screw is short in size and used for fine adjustment. Through the adjustment of the screw rod, the stability of the adjustment action is ensured, and the accuracy of the adjustment is also ensured.

In order to enable the second flange to form a connecting and moving function in the second guide rail, a guide groove is formed in the second guide rail, a guide block is formed by protruding the second flange, the guide block is inserted into the guide groove and can move along the guide groove, therefore, when the second flange is not adjusted, the second flange is matched with the guide groove and the guide block, the gravity direction of the second flange is perpendicular to the moving direction, the second flange is stable, and therefore the guide groove and the second lead screw need to be arranged in parallel.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

(1) the utility model discloses the rigidity ion source to, install outside the vacuum, by the outer displacement platform drive in vacuum, the accuracy nature of its displacement has been guaranteed to its rigidity, and the outer installation in vacuum is fixed, makes its restriction that can not receive the accelerator state dismantle fast. Implementations of rigid ion sources may be, but are not limited to, using a support plate.

(2) The utility model discloses a position control mechanism, install outside the vacuum, its volume size does not receive accelerator inner space's restriction, can realize complicated and accurate multidimensional motion control. The bearing, the lead screw and the guide rail are installed outside vacuum, and the lubrication of the bearing, the lead screw and the guide rail is not limited by oil, and various lubrication modes can be adopted. The accelerator is installed outside vacuum, a transmission mechanism, a driving motor, a signal wire, a power wire and the like of the accelerator are all arranged outside the accelerator, and the type selection and the design are not limited by the vacuum condition any more.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a rear view of the present invention;

FIG. 3 is a schematic view of the overall installation;

FIG. 4 is a partial schematic view of FIG. 3;

FIG. 5 is a schematic diagram of a rigid ion source;

fig. 6 is a side view of fig. 5.

Reference numbers and corresponding part names in the drawings:

1-a first driving device, 2-a first transmission device, 3-a first guide rail, 4-a corrugated pipe, 5-a first flange, 6-a second guide rail, 7-a second transmission device, 8-a second driving device, 9-a second flange, 10-a support frame and 11-a mounting frame.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Examples

As shown in fig. 1 and 2, the position adjustment mechanism is dedicated to a rigid ion source in a cyclotron, which is a cyclotron using an internal ion source, and an ion beam is generated inside the cyclotron. The hollow support frame 10 with openings on two sides is adopted, a driving device I1 is installed on the outside of the support frame 10, the driving device I1 adopts a motor, a guide rail I3 is arranged in a cavity of the support frame 10, the driving device I1 and the guide rail I3 are connected through a transmission device I2, the transmission device I2 is preferably a screw I, one end of the screw I is connected with the driving device I1, the other end of the screw I penetrates through the guide rail I3, the screw I is sleeved with a bearing and then is inserted into the support frame 10, and therefore the screw I can rotate around the axis of the screw I when the driving device I1 drives the screw I. The first guide rail 3 plays a nut-like side effect, and the rotation of the first lead screw is converted into horizontal movement, so that the first driving device 1 can drive the first guide rail 3 to move along the axis direction of the first guide rail through the first lead screw. A first flange 5 used for being fixed with an accelerator shell is fixed on a support frame 10, a second guide rail 6 is connected on the first guide rail 3, a second flange 9 and a second driving device 8 are arranged on the second guide rail 6, the second driving device 8 also adopts a motor, the second driving device 8 is fixed with the second guide rail 6 through a mounting frame 11, a rigid ion source is installed on the second flange 9, the second guide rail is arranged between the first flange 5 and the second flange 9, the second driving device 8 is connected with a second transmission device 7, the second transmission device 7 is a second lead screw, one end of the second lead screw is connected with the second driving device 8, the other end of the second lead screw is connected with the second flange 9, the second lead screw can rotate around the axis of the second lead screw, the second driving device 8 can drive the second flange 9 to move along the second guide rail 6 through the second lead screw, specifically, a guide groove is arranged in the second guide rail 6, a guide block is formed, the guide groove and the second lead screw are arranged in parallel. In order to realize the multidimensional movement, the moving direction of the second flange 9 is perpendicular to the moving direction of the first guide rail 3, meanwhile, a corrugated pipe 4 is arranged between the second guide rail 6 and the first flange 5, and two ends of the corrugated pipe 4 are respectively in seamless connection with the second guide rail 6 and the first flange 5. In order to realize compact structure and prevent the movement interference, the guide rail II 6, the flange I5, the flange II 9 and the corrugated pipe 4 are arranged outside the support frame 10. During specific actions, the first lead screw is driven to rotate through the first driving device 1, the first guide rail 3 sleeved on the first lead screw moves along the axis direction of the first lead screw, the first guide rail 3 and the second guide rail 6 are fixed, the second guide rail 6 is driven to move along the axis direction of the first lead screw, namely the corrugated pipe 4 is compressed or extended, the position of a rigid ion source in the direction is adjusted, the second lead screw is driven to rotate through the second driving device 8, the second flange 9 sleeved on the second lead screw moves along the axis direction of the second lead screw, the second guide rail 6 is not moved as positioning, only the second flange 9 is inserted into the guide groove through the guide block and moves along the guide groove, and fine adjustment is achieved. The present solution is directed to an ion source that is rigid, rather than flexible. The rigid condition ensures that driving the ion source outside the accelerator can achieve accurate displacement of the ion source inside the accelerator.

The utility model discloses install at accelerator surface or real empty room's surface, can realize the motion control of one-dimensional, two-dimentional, three-dimensional, multidimension, adopt bellows structure to realize a plurality of dimension control under the vacuum condition. After the rigid ion source is inserted into the accelerator, the rigid ion source is installed on the outer side of the vacuum outer displacement table, and a guide device can be arranged or not arranged in the accelerator.

Due to the principle limitations of the cyclotron, the discharge chamber of the ion source is located near the center of the accelerator, and the position, angle, etc. of the discharge chamber relative to the accelerator need to be accurately positioned and can be adjusted within a certain range. The inside of the accelerator is of a vacuum structure, and the vacuum is separated from the atmosphere by a vacuum chamber (an accelerator magnet is also used as a component of the vacuum chamber).

One specific internal ion source cyclotron is used with an internal ion source embodiment as shown in figures 5 and 6. Comprises a discharge chamber, a water and electricity gas pipeline and a rigid reinforcing structure (such as but not limited to a support plate and a support block). In the structure, an ion source is fixed on a position adjusting mechanism through a fixed flange, two sides of the adjusting mechanism are respectively provided with a flange,

as shown in fig. 1 and 2, one end is fixed to the ion source and the other end is fixed to the accelerator (e.g., mounted on the outer wall of the vacuum chamber). When the position adjusting mechanism does not work, one end of the ion source far away from the discharge chamber is fixed relative to the accelerator. Although the ion source is long, a rigid reinforcing structure is adopted to make the ion source have enough rigidity, so that the whole position of the ion source (particularly the position of a discharge chamber) is accurately fixed although only one end is fixed. When the position adjusting mechanism works, the position adjusting mechanism drives one end of the ion source, which is far away from the discharge chamber, to move along one or more directions, and the rigid structure ensures that the discharge chamber also moves accurately. Thereby achieving the fixing and adjustment of the ion source position.

The position adjusting mechanism can complete motion control in two directions, the two motors respectively drive the screw rods in the two directions to move so as to drive the load (ion source) to move, and the deformation of the guide rail during motion is strictly controlled so as to realize precision control. The adjusting mechanism can be stretched, compressed and twisted by using a metal corrugated pipe, so that vacuum sealing is realized during load movement.

Fig. 3 and 4 show examples of the mounting of the rigid ion source and the position adjustment mechanism on the accelerator. The position adjusting mechanism arranged outside the vacuum simultaneously serves as a transition mechanism to realize the positioning and installation of the ion source and the accelerator. After installation, all components are visible outside the vacuum chamber. The ion source can be disassembled only by taking down 6 screws on the ion source fixing flange and drawing out the ion source. Installation is simply by inserting the ion source and tightening 6 screws. The entire process does not require the accelerator to be turned on.

The utility model discloses contain rigidity ion source structure and the outer two-dimentional drive platform in vacuum. The rigid ion source is arranged on the displacement platform and is driven by the platform to complete the two-dimensional motion of the ion source on the extraction plane. Due to the adoption of the rigid ion source, the driving outside the vacuum can be accurately transmitted to the center of the accelerator, and the accurate control of the position of the ion source in the accelerator is realized. After the mechanism is adopted, the ion source does not need to be fixed in the accelerator any more, the ion source is disassembled without opening the accelerator, the assembling and disassembling processes of the ion source are simplified, and the radiation dose born by workers is reduced. Meanwhile, the driving platform is installed outside vacuum and is not limited by the internal space of the accelerator any more, two-dimensional adjustment can be conveniently and accurately realized, the complexity of the system is reduced, and the reliability is also improved.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. The position adjusting mechanism special for the rigid ion source in the cyclotron comprises a support frame (10) and is characterized in that a first guide rail (3) is arranged in the support frame (10), a first driving device (1) is installed outside the support frame (10), the first driving device (1) is connected with a first transmission device (2), the first transmission device (2) is connected with the first guide rail (3), and the first driving device (1) can drive the first guide rail (3) to move along the axis direction of the first guide rail (3) through the first transmission device (2); the supporting frame (10) is fixed with flange one (5) that is used for fixing with the accelerator shell, be connected with guide rail two (6) on guide rail one (3), be provided with flange two (9) and drive arrangement two (8) on guide rail two (6), guide rail two sets up between flange one (5) and flange two (9), drive arrangement two (8) are connected with transmission two (7), transmission two (7) are connected with flange two (9), and drive arrangement two (8) can drive flange two (9) through transmission two (7) and remove along guide rail two (6), and the moving direction of flange two (9) is perpendicular with the moving direction of guide rail one (3).

2. The position adjusting mechanism for the rigid ion source in the cyclotron according to claim 1, wherein a bellows (4) is disposed between the second guide rail (6) and the first flange (5), and two ends of the bellows (4) are respectively connected to the second guide rail (6) and the first flange (5) in a seamless manner.

3. The mechanism of claim 2, wherein the second guide rail (6), the first flange (5), the second flange (9) and the bellows (4) are disposed outside the support frame (10).

4. The position adjustment mechanism for the rigid ion source in the cyclotron according to claim 1, wherein the first transmission device (2) is a first lead screw, one end of the first lead screw is connected with the first driving device (1), the other end of the first lead screw passes through the first guide rail (3) and then is inserted into the support frame (10), and the first lead screw can rotate around its axis.

5. The position adjusting mechanism for the rigid ion source in the cyclotron according to claim 1, wherein the second transmission device (7) is a second lead screw, one end of the second lead screw is connected with the second driving device (8), the other end of the second lead screw is connected with the second flange (9), and the second lead screw can rotate around its own axis.

6. The position adjustment mechanism for the rigid ion source in the cyclotron according to claim 5, wherein the second guide rail (6) is provided with a guide groove therein, and the second flange (9) protrudes to form a guide block, and the guide block is inserted into the guide groove and can move along the guide groove.

7. The mechanism of claim 6, wherein the guide slot and the lead screw are arranged in parallel.

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