CN219204770U - Stopper rotation switching device and accelerator - Google Patents

Abstract

The application relates to a stopper rotation switching device and accelerator, the device includes: a plurality of stoppers for changing a dose distribution of the radiation output from the accelerating tube of the accelerator, the plurality of stoppers including stoppers having different amounts of change to the dose distribution; and a rotary switcher mounted with a plurality of stoppers and rotationally switched according to the target dose distribution such that the stoppers at mounting positions corresponding to the target dose distribution are located at the outlet of the acceleration tube. By providing a plurality of stoppers and rotationally switching the plurality of stoppers, the output of a plurality of dose distributions can be achieved without frequent replacement of the stoppers.

Description

Stopper rotation switching device and accelerator

Technical Field

The present utility model relates to the technical field of linear accelerators, and in particular, to a damper rotation switching device mounted on an accelerator and an accelerator including the same.

Background

In large vehicle/container security inspection equipment for customs, civil aviation and railway transportation at present, an electronic linear accelerator system is mostly adopted as an X-ray generating device. The high-energy X-rays generated by the device can carry out nondestructive detection on objects with different thicknesses and qualities, can realize effective identification on the objects to be detected under the condition of rapid and non-unpacking, can carry out identification marking on contraband contained in the objects to be detected, and can ensure the personal and property safety of citizens and maintain social stability.

In the existing radiation imaging field, the object to be detected is identified and detected mainly by using an X-ray projection imaging technology. The energy size and angular distribution requirements are different for different items to be inspected, however, there are fewer means for changing the radiation dose and changing the radiation angular distribution in current linac systems, and therefore a means of changing the dose distribution is required.

Disclosure of Invention

It is an object of the present application to provide a blocker rotation switching device for changing a dose distribution and an accelerator comprising the same.

According to one aspect of the present application, there is provided a blocker rotation switching device including: a plurality of stoppers for changing a dose distribution of the radiation output from the accelerating tube of the accelerator, the plurality of stoppers including stoppers having different amounts of change to the dose distribution; and a rotary switcher mounted with a plurality of stoppers and switching positions where the stoppers are mounted by rotation such that the stoppers at mounting positions corresponding to a target dose distribution are located at the outlet of the acceleration tube. According to this aspect, the plurality of stoppers are switched by the rotation of the rotation switch, so that the dose distribution of the radiation beam output from the acceleration tube can be changed.

In the above-described blocker rotation switching device, the plurality of blockers includes blockers having different shapes. By means of the stoppers of different shapes, the dose distribution can be changed more carefully, so that the application range of the stopper rotation switching device is wider.

In the above-described blocker rotation switching device, the rotation switch includes a blocker mounting plate having a plurality of mounting positions, and the plurality of blockers are mounted at the plurality of mounting positions of the blocker mounting plate.

In the above-described damper rotation switching device, the dose distribution of the radiation output from the acceleration tube penetrating each mounting position is different.

In the above-described blocker rotation switching device, the rotation switching device further includes: the power mechanism provides power for the rotary switcher to enable the rotary switcher to rotate around the axis; the transmission mechanism transmits the power of the power mechanism to the stopper mounting plate; and a fixed mounting mechanism that fixedly mounts the rotary switch to the accelerator.

In the above-described stopper rotation switching device, the power mechanism includes: direct current servo motor, fixed mounting mechanism includes: the servo motor is fixedly installed on the base through the motor base, and the base is fixedly installed on the accelerator.

In the above-described stopper rotation switching device, the transmission mechanism includes: pinion, gear wheel, pinion and DC servo motor's output shaft, gear wheel and pinion interlock, stopper mounting disc and gear wheel fixed connection.

In the above-described stopper rotation switching device, the fixed mounting mechanism further includes: the stopper mounting plate is mounted to the base through the rotation shaft and the ball bearing.

In the above-described blocker rotation switching device, one blocker is mounted on each mounting position, respectively, and the shape of each blocker is different.

In the above-described blocker rotation switching device, the mounting position is a through hole, and at least 2 blockers are mounted in at least a part of the through holes along the axial direction of the through hole, and the dose distribution of the radiation output from the accelerating tube penetrating each through hole is different.

The above-mentioned stopper rotation switching device further includes: and the control module is used for outputting a control instruction to the rotary switcher based on the corresponding relation, and the rotary switcher is used for rotationally switching based on the control instruction so that the stopper at the mounting position corresponding to the target dose distribution is positioned at the outlet of the accelerating tube.

According to a second aspect of the present application there is provided an accelerator comprising: an accelerating tube; and the stopper rotation switching device described above.

According to the damper rotation switching device and the accelerator, the change of the dose distribution of the accelerator output of the accelerating tube of the accelerator can be realized through the rotation switching of different dampers.

Drawings

Fig. 1 (a) to (b) show an example of the effect of the stopper according to the present application on changing the dose distribution, where fig. 1 (a) is before changing and fig. 1 (b) is after changing.

Fig. 2 is another example showing the changing effect of the stopper on the dose rate percentage referred to in this application.

Fig. 3 is a diagram showing the effect on dose distribution when comparing a blocker according to the present application with a shield.

Fig. 4 is a schematic diagram showing a blocker rotation switching device according to the first embodiment.

Fig. 5 (a) to (b) are diagrams showing examples of the design of the shapes of the plurality of stoppers 10 according to the first embodiment of the present application.

Fig. 6 (a) to (b) are schematic diagrams showing the structure of the damper rotation switching device according to the second embodiment.

Detailed Description

Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present application more apparent, and to further describe the present application in conjunction with the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

Before explaining the damper rotation switching device according to the present application, first, a principle of changing the dose distribution of the radiation output from the acceleration tube by using the damper and an operation of the damper will be described.

(principle and action of stopper)

The exit rays of the accelerator tube of the linac are usually in two forms, one is to directly output the accelerated high-energy electron beam line, and the other is to output the X-rays generated after the target is struck with the high-energy electron beam. In either case, depending on the application, the dose rate, the angular distribution, i.e. the dose distribution of the radiation, is generally required.

In general, the dose rate and the angular distribution of the radiation directly output by the acceleration tube do not necessarily satisfy the corresponding requirements, and therefore a device capable of changing the dose distribution is required.

Fig. 1 (a) to (b) show an example of the effect of the stopper on changing the dose distribution, and fig. 1 (a) is before the change and fig. 1 (b) is after the change. In fig. 1 (a) to (b), the right graph shows the dose distribution of the output radiation.

The inventors of the present application found that if a stopper made of a metal material (e.g., lead, tungsten) of a special shape as shown in fig. 1 (b) is installed at the outlet of the accelerating tube of the accelerator, the dose distribution of the original fig. 1 (a) can be changed to the dose distribution shown in fig. 1 (b), and at this time, the low energy component in the radiation can be effectively reduced, and the performance of the radiation can be improved.

Because the dose distribution of rays presented under different angles is different, the difference cannot meet the use requirement in an application scene with consistent requirements on the dose rate and the angle distribution, and therefore, in the application, the dose rate and the angle distribution can be close to be consistent through the action of the stopper. As shown in fig. 2, the dose with uneven distribution can be distributed and leveled by the action of the stopper.

Fig. 2 is another example showing the effect of a damper on the change in dose rate percentage, wherein the horizontal axis represents the distance of the ray from the main axis of the accelerating tube in cm and the vertical axis represents the dose rate percentage. Wherein the points of the triangle represent the percentage of dose rate before setting the blocker, i.e. the curve connecting the points of the triangle represents the original "percentage of dose rate", while the points of the square represent the percentage of dose rate after setting the blocker, i.e. the curve connecting the points of the square represent the "percentage of dose rate after correction". In addition, the "shape of beam blocker" curve in fig. 2 shows the sectional shape of the blocker provided in this example and the position of the blocker.

As can be seen from fig. 2, the percentage of dose rate of the original output of the acceleration tube had a significant peak and was not flat before the stopper was set, but after the stopper was set in a shape as shown in fig. 2 within a range of (-20, 20) deviating from the principal axis at the outlet of the acceleration tube, the percentage of dose rate tended to be uniform within a range of (-20, 20) deviating from the principal axis, and a flat section of the curve existed. That is, by providing a blocker, the dose rate percentage curve can be flattened.

In order to better understand the function of the stopper, the following description will be made by comparing with the shield.

The barrier in the present application is in principle, consistent with the principle of a shield in that rays are blocked or attenuated by a metallic material of high atomic number. The main purpose of the stopper of the present application is to modify the radiation, that is, to adjust the energy, angle, etc. of the electron beam or X-ray output from the accelerator. However, the shielding body is biased towards radiation protection requirements, the dosage of X-rays is reduced to a dosage meeting the protection requirements through the thickness of the material, for example, energy is measured by a common half-value layer method, and specific energy of X-rays can be determined due to different attenuation rates of steel plates with different thicknesses on different energies.

Fig. 3 is a graph showing the effect of comparing the shield and blocker on the dose distribution. Wherein the triangular dots represent the percentage of dose rate before the blocker is set, and the square dots represent the percentage of dose rate after the blocker is set.

When the accelerator tube of the accelerator is subjected to dose shielding of the tube body, the radiation attenuation is also performed by using a high atomic number material, and the radiation shielding can be reduced to 1% or less than 5% by increasing the whole thickness of the material. The blocking and attenuation effect of the shielding of the tube against radiation is shown in the graph of "shielding dose attenuation percentage" in fig. 3.

The "corrected dose rate percentage" curve in fig. 3 is a schematic diagram when a blocker is used in the simulation calculation, by which the dose distribution can be corrected so as to be flat in a desired range, i.e., to form a waveform with flattened peaks.

It follows that the action of the damper is biased towards the radiation protection requirement compared to the shield, which normally shields the body of the accelerator tube of the accelerator, and therefore generally adopts the same thickness, and thus generally the same cross-sectional shape, through which the energy is substantially uniformly reduced. However, the stopper of the present application is capable of changing the dose distribution of the radiation output from the acceleration tube. By arranging the stopper with a specific shape at the outlet of the accelerating tube, the angle distribution at the outlet can be close to be consistent, namely, as shown in fig. 2 and 3, the dose rate percentage curve can be flattened, so that the method can be applied to application scenes with consistent requirements on dose rate and angle distribution.

The effect of the stopper on adjusting the dose distribution varies depending on the shape, thickness, or material of which the stopper is made, and by adjusting at least one of the shape, thickness, and material of which the stopper is made, a plurality of stoppers each varying in the amount of change in the dose distribution can be obtained.

Based on the above-described principle, the present application provides a blocker rotation switching device capable of rotationally switching a plurality of blockers, each of which varies in the amount of change in dose distribution, and an accelerator to which the device is mounted.

(first embodiment)

Hereinafter, a stopper rotation switching device according to a first embodiment of the present application will be described with reference to fig. 4 and (a) to (b) of fig. 5.

As shown in fig. 4, the blocker rotation switching device 100 includes a plurality of blockers 10 and a rotation switching device 20.

The damper 10 is used to change the dose distribution output by the accelerator tube 200 of the accelerator. There are a plurality of stoppers 10, and the plurality of stoppers 10 include stoppers having different amounts of change in the dose distribution. The plurality of stoppers 10 may comprise stoppers of different thickness, material, or shape, thereby varying the amount of change in the dose distribution.

Fig. 4 and (a) to (b) of fig. 5 show examples in which the shapes of the plurality of stoppers 10 are different. When the shape of the stoppers 10 is different, the amount of change in the dose distribution by each stopper 10 is different. Specifically, the plurality of stoppers are different in cross-sectional shape in the longitudinal direction. The longitudinal direction is a direction parallel to the main axis of the acceleration tube. Fig. 4 and (a) to (b) of fig. 5 show longitudinal sections of each stopper 10 through the center thereof. These cross-sectional shapes are merely examples, and shapes that can be adopted in practice are not limited thereto, and may be designed via simulation calculation based on the original output of each accelerator and the target dose distribution. By changing the dose distribution by the shape of the stopper, both the dose rate and the angle can be finely adjusted, and a target dose distribution which meets more diversity can be given, as compared with the case where the dose distribution is changed by the thickness or the material of the stopper, so that the application range of the stopper rotation switching device and the accelerator can be made wider.

The rotary switcher 20 is mounted with a plurality of stoppers and switches the positions where the stoppers are mounted by rotation so that the stoppers at the mounting positions corresponding to the target dose distribution are located at the outlet of the acceleration tube. In other words, one or more blockers 10 of the plurality of blockers corresponding to the target dose distribution are respectively located at the outlet of the acceleration tube 200 by switching of the rotary switcher 20. Here, the target dose distribution refers to a dose distribution to be used in the application scene, and may be set according to the application scene.

Fig. 4 shows a case where 4 stoppers 10 are mounted on the rotary switch 20, but the number of stoppers 10 is not limited thereto.

Fig. 5 (a) to (b) show design examples of the shapes of the plurality of stoppers 10. Here, (a) of fig. 5 shows the shape of 4 stoppers 10 and the dose distribution corresponding thereto, and (b) of fig. 5 shows the mounting relationship of 4 stoppers 10 and the rotary switch 20.

In fig. 4 and (a) to (b) of fig. 5, the mounting positions where the stopper 10 is mounted are shown in dark colors, and the mounting positions where the stopper 10 is not mounted are shown in light colors. The mounting position is a position for mounting the stopper 10 in the rotary switch 20.

Fig. 4 and (a) to (b) of fig. 5 show a case where a plurality of stoppers 10 are designed in different shapes.

The rotary switch 20 includes 5 mounting positions, wherein 4 mounting positions are respectively provided with a stopper having a different shape, and one mounting position is not provided with the stopper 10. Thus, the radiation emitted from one acceleration tube has different dose distributions, which are output through 5 mounting positions. The plurality of stoppers 10 are respectively mounted on mounting positions of the rotary switch 20, which may be on the outer surface or the inside of the rotary switch 20. That is, the mounting position may be a fixed position, a pit, a through hole, or the like on the surface of the rotary switch 20, as long as it is a position fixed in advance.

Fig. 4 and (a) to (b) of fig. 5 show only one example of the mounting of the blocker 10 on the rotary switch 20, and are not exclusive. The number and position of the mounting positions are not limited to those shown in the drawings, and the correspondence between the shape of the stopper 10, the target dose distribution, and the mounting positions may be recorded in advance, and the rotary switcher 20 may switch such that the center of the mounting position, that is, the center of the stopper, is located on the main axis of the acceleration tube 100 of the accelerator.

The correspondence relationship between the shape of the stopper 10, the target dose distribution, and the mounting position can be obtained specifically as follows. First, the shape of the stopper corresponding to each target dose distribution is obtained by analog calculation in advance for each ray output from the accelerator, and verified by actual measurement. That is, the shape of the stopper can be designed according to the original output of the acceleration tube and the target dose distribution. Thereby obtaining a correspondence of the shape of the blocker 10 to the target dose distribution. Then, when the plurality of stoppers 10 are respectively mounted to the mounting positions, the correspondence between the shape of each stopper 10 and the mounting position is obtained, and the correspondence between the three is obtained. Thus, the correspondence between the target dose distribution and the mounting position can be obtained.

In the blocker rotation switching device of the first embodiment, a control module may be further included, in which a correspondence between the target dose distribution and a mounting position (i.e., a mounting position) of the blocker on the rotation switcher may be stored in advance, the control module outputting a control instruction to the rotation switcher based on the correspondence, the rotation switcher rotating based on the control instruction so as to rotate the mounting position corresponding to the target dose distribution to an outlet of the acceleration tube. Here, the position at the outlet of the acceleration pipe may be such that the center of the stopper of the installation position is located on the main shaft of the acceleration pipe 100 of the accelerator.

In addition, alternatively, as shown in fig. 4 and 5, the main shaft of the blocker rotation switching device and the axis of the accelerating tube 200 are not collinear, whereby the blocker 10 and the accelerating tube 200 mounted at the mounting position are easily made to be on the same line when the blocker is rotationally switched.

According to the blocker rotation switching device of the present embodiment, the rotation of the plurality of blockers 10 having different dose change amounts of the same accelerating tube 200 is switched by the rotation switch 20, and the accelerator can be applied to various application scenes by outputting rays having various dose distributions from the accelerating tube of the accelerator by a simple rotation operation without replacement of the blockers.

(second embodiment)

Hereinafter, a second embodiment of the present application will be described with reference to fig. 6 (a) to (b). The second embodiment provides a more specific example of the mechanical structure of the blocker rotation switching device.

Fig. 6 (a) to (b) are schematic diagrams showing the structure of the damper rotation switching device according to the second embodiment. Fig. 6 (a) shows the assembled damper rotation switching device, and fig. 6 (b) shows an exploded perspective view of the damper rotation switching device.

In the blocker rotation switching device of the second embodiment, the rotation switching device includes: the motor comprises a direct-current servo motor 1, a motor base 2, a pinion 3, a large gear 4, a stopper mounting disc 5, a rotating shaft 8, a ball bearing 9 and a base 10.

As shown in fig. 6, the dc servo motor 1 powers a rotary switch to rotate about an axis. Specifically, the dc servo motor 1 powers the blocker mounting plate 5 such that the blocker mounting plate 5 to which the blocker is mounted rotates about its axis, thereby changing the position of the blocker. Here, the dc servo motor 1 functions as a power mechanism. The dc servo motor 1 is an example of a power mechanism, and any power mechanism may be used as long as it can drive the damper mounting plate 5 to rotate about its axis, and this is not a limitation.

The motor mount 2 is used to mount the dc servo motor 1 to the base 10. That is, the dc servo motor 1 is mounted on the base 10 via the motor mount 2. Thereby, the dc servo motor 1 can be mounted to the accelerator.

The pinion 3 is fixedly connected with the output shaft of the direct current servo motor 1. The rotation of the output shaft of the direct current servo motor 1 drives the pinion 3 to rotate. The pinion 3 may be connected to the output shaft of the dc servomotor 1, for example by means of screws.

The large gear 4 is meshed with the small gear 3 and fixedly connected with the stopper mounting plate 5. When the pinion 3 rotates, the large gear 4 engaged with the pinion rotates, and the large gear 4 drives the stopper mounting plate 5 fixedly connected with the large gear to rotate, so that the rotation of the direct current servo motor 1 can be transmitted to the stopper mounting plate 5, and the positions of the stoppers mounted on the stopper mounting plate 5 can be changed.

The blocker mounting plate 5 is used for mounting the blocker, and a plurality of mounting positions are arranged on the blocker mounting plate 5, and the blocker is mounted at the mounting positions. In fig. 6, 4 mounting locations are shown, however, other numbers of mounting locations are possible.

In fig. 6, a cylindrical stopper mounting plate 5 is shown, with a plurality of mounting locations arranged along the circumferential direction. However, the stopper mount plate 5 is not limited to a cylindrical shape. Optionally, the blocker mounting plate 5 is axisymmetric in shape. Alternatively, the radial distance of each mounting location to the axis of the blocker mounting plate 5 is the same.

As shown in fig. 6, the mounting locations are, for example, through holes. That is, a plurality of through holes are provided in the stopper mount plate 5 along the circumferential direction.

In the blocker rotation switching device of the second embodiment, the blocker includes: a first stage stopper 6 and a second stage stopper 7.

As shown in fig. 6, a first stage stopper 6 and a second stage stopper 7 are installed in the through hole of the stopper mounting plate 5.

The shape, thickness, material, etc. of the first stage stopper 6 and the second stage stopper 7 located in the same through hole may be the same or different as long as the dose distribution outputted through each mounting position is different, respectively. That is, the combination of the first stage stopper 6 and the second stage stopper 7 in each through hole may be capable of bringing about different amounts of dose change. In addition, although the first stage stopper 6 and the second stage stopper 7 of two stages are shown in fig. 6, the level of the stoppers in each through hole may be other levels such as three, four, etc., that is, the stoppers in each through hole are not limited to two.

As shown in fig. 6, by providing multiple stages of stoppers in the through hole of the same mounting position, more combinations of stoppers can be provided, thereby providing more combinations of dose distributions, so that the range of application of the stopper rotation switching device is wider.

The spindle 8 and ball bearing 9 are used to mount the damper mounting plate 5 to the base 10. That is, the stopper mounting plate 5 is connected to the outer ring of the ball bearing 9, the rotating shaft 8 is connected to the inner ring of the ball bearing 9, and the rotating shaft 8 is fixedly mounted to the base 10 so that the stopper mounting plate 5 and the large gear 4 which are fixedly connected can rotate with respect to the rotating shaft 8. The axis of the rotary shaft 8 is collinear with the axis of the blocker mounting plate 5 and the axis of the gearwheel 4.

The base 10 is used to assemble the blocker rotation switching device and the accelerator. The base 10 is fixedly mounted to the accelerator. For example, the base 10 is mounted to the frame of the accelerator by screws.

As described above, the direct current servo motor 1 is fixedly mounted on the base 10 through the motor housing 2, the rotation shaft 8 is fixedly mounted on the base 10, the base 10 is fixedly mounted on the accelerator, and the ball bearing 9 realizes the connection between the blocker mounting plate 5 and the blocker mounting plate 5, and therefore, the motor housing 2, the rotation shaft 8, the ball bearing 9, and the base 10 constitute a fixed mounting mechanism for fixedly mounting the rotary switch in the blocker rotation switching device on the accelerator. The motor base 2, the rotary shaft 8, the ball bearing 9, and the base 10 shown in fig. 6 are only one example of a fixed mounting mechanism, and any structure may be employed as long as the stopper rotation switching device can be fixedly mounted to the accelerator in the present application, and this is not limited.

In addition, the stopper rotation switching device according to the second embodiment may further include a control module in which a correspondence between the target dose distribution and the mounting position (i.e., the mounting position) of the stopper on the rotation switch is stored in advance, and the control module may output a control instruction to the rotation switch based on the correspondence. The process of obtaining the control instruction may be: according to the target dose distribution, the calculated mounting positions of the corresponding stoppers are calculated, the rotation angle of the stopper mounting plate 5 is calculated according to the mounting positions, and the rotation angle of the direct current servo motor 1 is calculated based on the rotation angle of the stopper mounting plate 5.

At this time, the work flow of the blocker rotation switching device is approximately as follows:

the direct current servo motor 1 receives a control instruction from a control module, so as to rotate an angle corresponding to the control instruction;

the output shaft of the direct current servo motor 1 drives the pinion 3 to rotate;

the pinion 3 drives the large gear 4 meshed with the pinion 3 to rotate to a designated position;

the blocker mounting plate 5 rotates with the gearwheel 4, moving the mounting position corresponding to the target dose distribution to the outlet of the acceleration tube.

According to the stopper rotation switching device of the second embodiment, rotation switching of the stopper is achieved by the transmission mechanism of the power mechanism provided in the rotation switch, connection between the respective members of the rotation switch and mounting with the accelerator are achieved by the fixed mounting mechanism, so that switching of the plurality of stoppers located at different mounting positions by the rotation switch can be achieved, replacement of the stoppers is not performed, and change of dose distribution of accelerator tube output of the accelerator can be achieved by simple rotation operation.

Although the embodiments and specific examples of the present application have been described above with reference to the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the claims.

Claims (12)

1. A damper rotation switching device, characterized by comprising:

a plurality of stoppers for changing a dose distribution of the radiation output from the accelerating tube of the accelerator, the plurality of stoppers including stoppers having different amounts of change to the dose distribution; and

and a rotary switcher mounted with the plurality of stoppers and switching a position where the stoppers are mounted by rotation such that the stoppers at mounting positions corresponding to a target dose distribution are located at an outlet of the acceleration tube.

2. A damper rotation switching apparatus according to claim 1, wherein,

the plurality of stoppers include stoppers of different shapes.

3. Stopper rotation switching device according to claim 1 or 2, characterized in that,

the rotary switch includes a blocker mounting plate having a plurality of mounting positions,

the plurality of stoppers are mounted at a plurality of mounting positions of the stopper mounting plate.

4. A damper rotation switching apparatus according to claim 3, wherein,

the dose distribution of the radiation output by the accelerating tube penetrating each of the mounting positions is different.

5. The blocker rotation switching device according to claim 4, wherein,

the rotary switcher further includes:

a power mechanism for powering the rotary switch to rotate the rotary switch about an axis;

the transmission mechanism transmits the power of the power mechanism to the stopper mounting plate; and

and a fixed mounting mechanism for fixedly mounting the rotary switcher to the accelerator.

6. A damper rotation switching apparatus according to claim 5, wherein,

the power mechanism includes: a direct-current servo motor is arranged on the motor,

the fixed mounting mechanism includes: a motor base and a base seat,

the servo motor is fixedly mounted on the base through the motor base, and the base is fixedly mounted on the accelerator.

7. A damper rotation switching apparatus according to claim 6, wherein,

the transmission mechanism comprises: a small gear, a large gear and a large gear,

the pinion is connected with the output shaft of the direct current servo motor,

the large gear is meshed with the small gear,

and the stopper mounting plate is fixedly connected with the large gear.

8. A damper rotation switching apparatus according to claim 7, wherein,

the fixed mounting mechanism further includes: a rotating shaft and a ball bearing,

the blocker mounting plate is mounted to the base through the spindle and the ball bearing.

9. The blocker rotation switching device according to claim 4, wherein,

and each mounting position is provided with a stopper, and the shape of each stopper is different.

10. The blocker rotation switching device according to claim 4, wherein,

the mounting location is a through hole,

in at least a part of the plurality of through holes, at least 2 stoppers are installed along an axial direction of the through holes.

11. A damper rotation switching apparatus according to claim 1 or 2, further comprising:

the control module is used for controlling the control module,

the control module pre-stores a correspondence between the target dose distribution and the mounting position of the blocker on the rotary switcher, the control module outputs a control instruction to the rotary switcher based on the correspondence,

the rotation switch rotates based on the control instruction such that the stopper at the mounting position corresponding to the target dose distribution is located at the outlet of the acceleration tube.

12. An accelerator, comprising:

an accelerating tube; and

a damper rotation switching device according to any one of claims 1 to 11.

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