Conversion target device and accelerator

Abstract

The embodiment of the invention discloses a target conversion device and an accelerator. The target conversion device comprises a driving assembly, a target assembly and a plurality of target material sheets, the driving assembly comprises a driving part and a rotating shaft which are in driving connection and used for driving the rotating shaft to rotate. The target assembly is arranged at one end of the rotating shaft and can synchronously rotate along with the rotating shaft; the multiple target material sheets are arranged on the target assembly at intervals in the circumferential direction of the rotating shaft, and the target assembly rotates so that the electron beams can bombard different positions on any target material sheet; the thicknesses of the target material sheets are different, and the electron beams bombard the different target material sheets so as to generate X-rays with different energies. According to the conversion target device provided by the embodiment of the invention, the detection requirements in multiple scenes can be better met, the detection efficiency can be improved, and the service life of the conversion target device can be prolonged.

Description

Technical Field

[0001] The present application relates to the field of detection and flaw detection technology, and in particular to a conversion target device and an accelerator. Background Art

[0002] Accelerators are used in security inspection and industrial flaw detection to inspect or detect objects. In the field of security inspection, X-rays with different energy levels are usually required for inspection according to the size, material, density, etc. of the inspected object. In the field of industrial flaw detection, when inspecting parts with large differences in thickness and size, X-rays with different energy levels are also required for inspection. In response to such complex and changeable inspection requirements, multiple devices need to be equipped, which will increase the space occupied by the inspection system, cause some equipment to be vacant, and make the inspection more difficult and less efficient. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a conversion target device and an accelerator, aiming to better cope with detection requirements in multiple scenarios, improve detection efficiency, and at the same time extend the service life of the conversion target device.

[0004] To solve the above problems, the technical solution of the embodiment of the present application is implemented as follows:

[0005] A first aspect of an embodiment of the present application provides a target conversion device, comprising:

[0006] A driving assembly, comprising a driving member and a rotating shaft, wherein the driving member is drivingly connected to the rotating shaft and is used to drive the rotating shaft to rotate;

[0007] A target assembly is disposed at one end of the rotating shaft and can rotate synchronously with the rotating shaft;

[0008] A plurality of target sheets are arranged on the target assembly at intervals along the circumference of the rotating shaft. The target assembly rotates so that the electron beam can bombard different positions on any one of the target sheets. The thickness of each target sheet is different. The electron beam bombards different target sheets to generate X-rays of different energies.

[0009] In some embodiments, the target sheets are made of different materials; and / or,

[0010] At least part of the target material pieces generate keV-level X-rays under the bombardment of the electron beam, and at least part of the target material pieces generate MeV-level X-rays under the bombardment of the electron beam.

[0011] In some embodiments, the target sheet is made of copper, tungsten, tantalum or gold; and / or,

[0012] At least a portion of any of the target material sheets is exposed on the outer surface of the target assembly.

[0013] In some embodiments, at least part of the target material pieces are circular in structure; and / or,

[0014] The centers of the target material sheets are located on the same circumference, and the center of the circle corresponding to the circumference is located on the axis of the rotating shaft.

[0015] In some embodiments, the conversion target device also includes a moving part, which can generate movement along the axial direction of the rotating shaft or perpendicular to the axial direction of the rotating shaft. The driving part is arranged on the moving part and can follow the moving part to generate movement along the axial direction of the rotating shaft or perpendicular to the axial direction of the rotating shaft.

[0016] In some embodiments, the target assembly is provided with a accommodating cavity and a liquid inlet and a liquid outlet respectively connected to the accommodating cavity, the accommodating cavity is used to accommodate a coolant, and the target assembly has a partition wall, one side of the partition wall in the thickness direction constitutes the cavity wall of the accommodating cavity, and the other side is used to install each of the target material sheets.

[0017] In some embodiments, the target assembly includes a first enclosure and a first plate body and a second plate body that are spaced apart from each other, wherein the first enclosure is connected to the first plate body and the second plate body, respectively, and the three together define the accommodating cavity, the first plate body constitutes the partition wall, and the second plate body is connected to one end of the rotating shaft.

[0018] In some embodiments, the liquid inlet and the liquid outlet are both disposed on the first enclosure plate, and the liquid inlet and the liquid outlet are coaxially disposed; and / or,

[0019] The target assembly further includes a second enclosure plate disposed on the first plate body, the second enclosure plate and a side of the first plate body facing away from the accommodating cavity are surrounded to form an installation groove, and each of the target material sheets is located in the installation groove.

[0020] In some embodiments, the first plate and / or the second plate are sealing plates; and / or,

[0021] The first plate body and the second plate body are both circular, and the first plate body, the second plate body and the rotating shaft are coaxially arranged.

[0022] A second aspect of the embodiments of the present application provides an accelerator, wherein the accelerator includes the conversion target device described in any one of the above embodiments.

[0023] The conversion target device of the embodiment of the present application is provided with a plurality of target material sheets, and each target material sheet is provided on the target assembly at intervals along the circumference of the rotating shaft. The driving member drives the rotating shaft to rotate, and the rotating shaft drives the target assembly to rotate synchronously, so that the electron beam can bombard different target material sheets and obtain X-rays of different energies. X-rays of different energies are thus suitable for the detection needs of different scenarios. In other words, a conversion target device can be applied to multiple detection scenarios. Compared with the conventional detection method of using multiple devices to provide X-rays of different energies, the device using the conversion target device of the embodiment of the present application is conducive to reducing the space occupancy rate of the equipment and the vacancy rate of the equipment; at the same time, when responding to the detection needs of different scenarios, there is no need to replace the equipment, which is conducive to reducing the complexity of the operation during the detection, thereby improving the detection efficiency.

[0024] In addition, the driving assembly can also make the electron beam bombard different positions on a single target sheet. When the target sheet is bombarded for a certain period of time, the driving member drives the rotating shaft to rotate and rotates the target assembly in time to make the electron beam bombard another position on the target sheet. This is beneficial to the heat dissipation of the target sheet, thereby ensuring the conversion efficiency of X-rays and extending the service life of the target sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a target conversion device according to an embodiment of the present application;

[0026] Figure 2 It is a structural schematic diagram of a target assembly from one perspective of an embodiment of the present application, wherein a target material sheet is provided on the target assembly;

[0027] Figure 3 It is a structural schematic diagram of a target assembly from another perspective of an embodiment of the present application, wherein a target material sheet is provided on the target assembly;

[0028] Figure 4 for Figure 3 A schematic cross-sectional structure diagram of the target assembly shown;

[0029] Figure 5 It is a schematic cross-sectional structure diagram of a target assembly according to another embodiment of the present application, wherein a target material sheet is provided on the target assembly.

[0030] Description of Reference Numerals

[0031] 10. Driving assembly; 11. Driving member; 12. Rotating shaft; 20. Target assembly; 20a. Accommodating chamber; 20b. Partition wall; 20c. Mounting groove; 21. First enclosure; 21a. Liquid inlet; 21b. Liquid outlet; 22. First plate body; 23. Second plate body; 24. Second enclosure; 30. Target sheet; 40. Moving member; 50. Vacuum chamber. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and are therefore only used as examples, and the protection scope of the present application cannot be limited by this. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0038] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] X-rays are often used in accelerators, which convert electron beams into X-rays for imaging through a conversion target device. Specifically, the conversion target device includes a target sheet, and the electron beam bombards the target sheet, thereby converting it into X-rays. Accelerators can be used in detection technology fields such as safety inspections, or in the field of flaw detection of workpieces.

[0040] In related technologies, the research focus of conversion target devices is mostly on material selection, thickness optimization and heat dissipation of target sheets for X-rays of a certain energy. The conversion target devices produced based on this are limited by energy and have a single application scenario.

[0041] In practical applications, such as in the field of security inspection, for small items such as luggage or large items such as vehicles, depending on the size, material, density, etc. of the inspected object, it is necessary to use keV or MeV energy level X-rays to inspect them. However, judging from the use of existing security inspection equipment, the X-ray conversion capacity of a device is limited, and the loading and unloading and replacement process of the conversion target device is relatively cumbersome, which is not convenient for subsequent maintenance and replacement. In some major occasions, not only luggage needs to be inspected, but also large equipment, cargo, vehicles, etc. entering the venue need to be inspected. In response to its complex and changeable security inspection needs, multiple devices need to be equipped, which will increase the space occupied by the inspection system, cause some equipment to be vacant, increase the difficulty of detection, and reduce detection efficiency.

[0042] Similarly, in the field of industrial flaw detection, the energy of X-rays must also vary with the needs of the inspected parts. Low-energy keV-level X-rays have low penetration and high spatial resolution, which can well match the inspection needs of small parts with an equivalent thickness of tens of millimeters of steel; while for larger parts with an equivalent thickness of hundreds of millimeters of steel, high-energy MeV-level X-rays with low spatial resolution but high penetration are usually used for inspection. The current inspection method for complex workpieces is to use two sets of high-energy and low-energy radiation source systems for separate inspections, and then comprehensively analyze the results produced by different source irradiation to obtain the final judgment results. This method is also relatively complex and lengthy.

[0043] In addition, the existing conversion target devices are mainly planar conversion targets. When the high-energy electron beam bombards the heavy metal target sheet vertically, the incident target points are mostly concentrated within a radius of several millimeters, which easily leads to concentrated heat generation and small heat dissipation area of ​​the conversion target device, thereby reducing the life of the conversion target device and increasing the replacement frequency.

[0044] In view of this, the first aspect of the present application embodiment provides a target conversion device, please refer to Figures 1 to 5The conversion target device includes a driving assembly 10 , a target assembly 20 and a plurality of target material sheets 30 .

[0045] The driving assembly 10 includes a driving member 11 and a rotating shaft 12 . The driving member 11 is drivingly connected to the rotating shaft 12 to drive the rotating shaft 12 to rotate.

[0046] The specific type of the driving member 11 is not limited. For example, it can be various types of motors.

[0047] Under the action of the driving member 11 , the rotating shaft 12 rotates around its own axis.

[0048] The target assembly 20 is disposed at one end of the rotating shaft 12 and can rotate synchronously with the rotating shaft 12 .

[0049] The target assembly 20 is used to mount each target sheet 30. Figure 1 , the target assembly 20 is located in the vacuum chamber 50 , that is, one end of the rotating shaft 12 is connected to the driving member 11 , and the other end is located in the vacuum chamber 50 and connected to the target assembly 20 .

[0050] The target assembly 20 may be, for example, an axisymmetric structure (eg, a circular structure) having a central axis. After the rotating shaft 12 is connected to the target assembly 20 , the central axis of the rotating shaft 12 overlaps with the central axis of the target assembly 20 .

[0051] A plurality of target sheets 30 are arranged on the target assembly 20 at intervals along the circumference of the rotating shaft 12, and the target assembly 20 rotates so that the electron beam can bombard different positions on any target sheet 30. The electron beam can be converted into X-rays after bombarding the target sheet 30. In other words, the rotation of the target assembly 20 can enable the electron beam to bombard different positions on one target sheet 30, and can also enable the electron beam to bombard different target sheets 30.

[0052] It should be noted that the target sheets 30 may be arranged at equal intervals or unequal intervals along the circumference of the rotating shaft 12 , and the present application does not make any limitation thereto.

[0053] It should be noted that in the embodiments of the present application, a plurality refers to any number of two or more than two. Figure 2 and Figure 3 In the embodiment of the present application, 7 target sheets 30 are taken as an example.

[0054] The target sheets 30 have different thicknesses, and the electron beam bombards different target sheets 30 to generate X-rays of different energies. Specifically, when there are 7 target sheets 30, the electron beam bombards each target sheet 30 in sequence, so that at least 7 energies of X-rays can be obtained.

[0055] The thickness of the target sheet 30 refers to the dimension of the target sheet 30 in the axial direction of the rotating shaft 12 .

[0056] The thickness of the target sheet 30 is related to the X-ray yield and the electron leakage rate.

[0057] It should be noted that the thickness of each target sheet 30 may be increased or decreased arbitrarily or non-arbitrarily along the circumference of the rotating shaft 12 in the clockwise or counterclockwise direction. In this way, when the electron beam bombards each target sheet 30 in sequence along the circumference of the rotating shaft 12, the energy of the converted X-rays also increases or decreases arbitrarily or non-arbitrarily. In actual use, it is easier to determine the change trend of the X-ray energy, and the operation of X-ray energy regulation is more convenient.

[0058] The conversion target device of the embodiment of the present application is provided with a plurality of target sheets 30, and each target sheet 30 is arranged on the target assembly 20 at intervals along the circumference of the rotating shaft 12, and the driving member 11 drives the rotating shaft 12 to rotate, and the rotating shaft 12 drives the target assembly 20 to rotate synchronously, so that the electron beam can bombard different target sheets 30 and obtain X-rays of different energies, and the X-rays of different energies are suitable for the detection needs of different scenes. In other words, a conversion target device can be applied to multiple detection scenes. Compared with the conventional detection method of using multiple devices to provide X-rays of different energies, the device using the conversion target device of the embodiment of the present application is conducive to reducing the space occupancy rate of the equipment and the vacancy rate of the equipment; at the same time, when responding to the detection needs of different scenes, there is no need to replace the equipment, which is conducive to reducing the complexity of the operation during the detection, thereby improving the detection efficiency.

[0059] In addition, the driving component 10 can also allow the electron beam to bombard different positions on a single target sheet 30. When the target sheet 30 is bombarded for a certain period of time, the driving member 11 drives the rotating shaft 12 to rotate, and the target assembly 20 is rotated in time to allow the electron beam to bombard another position on the target sheet 30. This is beneficial to the heat dissipation of the target sheet 30, thereby ensuring the conversion efficiency of X-rays and extending the service life of the target sheet 30.

[0060] In some embodiments, at least a portion of the target material pieces 30 generate keV-level X-rays under the bombardment of the electron beam, and at least a portion of the target material pieces 30 generate MeV-level X-rays under the bombardment of the electron beam.

[0061] Low-energy X-rays at the keV level can be used for security checks on luggage or for flaw detection of small workpieces.

[0062] MeV-level high-energy X-rays can be used for safety inspections of large equipment, cargo, vehicles, etc., or for flaw detection of thicker and more complex workpieces.

[0063] It should be noted that the keV-level kiloelectronvolt X-rays. It is understandable that when both target pieces 30 transform into keV-level X-rays, the specific energy values ​​of the keV-level X-rays transformed into the two target pieces 30 are different.

[0064] It should be noted that the MeV-level X-rays are mega-electron volts. It is understandable that when both target pieces 30 transform into MeV-level X-rays, the specific energy values ​​of the MeV-level X-rays transformed into the two target pieces 30 are different.

[0065] In this embodiment, a conversion target device can simultaneously meet the functional requirements of low / high energy X-ray safety detection and precision flaw detection, and the application scope of the conversion target device is wider.

[0066] In some embodiments, the target sheet 30 is made of copper, tungsten, tantalum or gold.

[0067] It should be noted that the materials of the target sheets 30 can be the same or different. That is, according to actual needs, a series of target sheets 30 on the target assembly 20 can be the same material with different thicknesses (for example, a series of tungsten sheets with different thicknesses); or different materials with different thicknesses (for example, setting a gold target or a tantalum target for a specific energy and conversion efficiency).

[0068] Specifically, the materials of each target sheet 30 are different. For the keV-level low-energy X-ray beam emission requirement, the target sheet 30 can be made of copper, and the thickness is set to a series of continuously changing values ​​according to the commonly used energy in actual requirements, so that various values ​​of keV-level low-energy X-rays can be converted; for the MeV-level high-energy X-ray beam emission requirement, the material can be made of tungsten, tantalum, gold and other high atomic number materials, and the thickness is set to a series of continuously changing values ​​according to the commonly used energy in actual requirements, so that various values ​​of MeV-level high-energy X-rays can be converted.

[0069] After the material of the target sheet 30 is determined, the quality of the converted X-rays can be improved by coordinating and designing the thickness of the target sheet 30. The material of the target sheet 30 affects its thermal analysis and processing technology, and the thickness of the target sheet 30 affects the yield of X-rays and the electron leakage rate.

[0070] For some examples, see Figure 2 and Figure 4 ,or Figure 5 , at least part of any target sheet 30 is exposed on the outer surface of the target assembly 20. That is, the target sheet 30 can be embedded in the target assembly 20. In this way, when the electron beam bombards the target sheet 30, it will not be blocked by other structures, so it is easy to convert into X-rays.

[0071] In addition, a portion of the target sheet 30 leaks out from the outer surface of the target assembly 20 , and a force can be applied to the leaked portion, thereby facilitating installation or removal of the target sheet 30 .

[0072] The specific shape of the target sheet 30 is not limited.

[0073] In some embodiments, see Figures 2 to 4 , at least part of the target sheet 30 is a circular structure. The target sheet 30 with a circular structure is better adapted to the target assembly 20 with a circular structure, so that the installation and processing of the target sheet 30 are facilitated.

[0074] In other embodiments, the target piece 30 may also be in other shapes, such as square, strip, arc, etc.

[0075] For some examples, see Figure 2 and Figure 3 The centers of the target sheets 30 are located on the same circumference, and the center of the circle corresponding to the circumference is located on the axis of the rotating shaft 12 .

[0076] That is to say, when the target assembly 20 rotates, it rotates around the center of the circle corresponding to the circumference.

[0077] Specifically, when the target material piece 30 is a circular structure, the circular shape of the target material piece 30 is located on the circumference.

[0078] It can be understood that when the circumference is determined, when the circumference passes through the center of the target sheet 30, the arc extension length of the circumference on the target sheet 30 is the longest. In this way, during the rotation of the rotating shaft 12, the electron beam bombards more target points of the target sheet 30. After the electron beam bombards the same position of the target sheet 30 for a long time, there are more bombardment target points on the target sheet 30 to switch, thereby making it more convenient to adjust the bombardment target points.

[0079] For some examples, see Figure 1 The target conversion device also includes a moving member 40, which can generate movement along the axial direction of the rotating shaft 12 or perpendicular to the axial direction of the rotating shaft 12. The driving member 11 is arranged on the moving member 40 and can follow the moving member 40 to generate movement along the axial direction of the rotating shaft 12 or perpendicular to the axial direction of the rotating shaft 12.

[0080] The driving member 11 is fixed on the moving member 40 , so the driving member 11 can move along with the moving member 40 .

[0081] It should be noted that the movement perpendicular to the axial direction of the rotating shaft 12 means that the movable member 40 can move on a plane perpendicular to the axial direction of the rotating shaft 12, thereby driving the driving member 11 arranged on the movable member 40 to move on a plane perpendicular to the axial direction of the rotating shaft 12. The end of the rotating shaft 12 is fixedly connected to the target assembly 20, and therefore, it can also drive the target assembly 20 to move on a plane perpendicular to the axial direction of the rotating shaft 12, thereby facilitating the calibration between the target material sheet 30 and the emitted electron beam on the plane perpendicular to the axial direction of the rotating shaft 12.

[0082] It should be noted that the movement along the axial direction of the rotating shaft 12 means that the movable member 40 can be controlled to move along the axial direction of the rotating shaft 12, thereby driving the driving member 11 arranged on the movable member 40 to move along the axial direction of the rotating shaft 12. The end of the rotating shaft 12 is fixedly connected to the target assembly 20, and therefore, it can also drive the target assembly 20 to move along the axial direction of the rotating shaft 12, thereby facilitating the mutual movement calibration between the target material sheet 30 and the emitted electron beam in the axial direction of the rotating shaft 12.

[0083] In a specific embodiment, the movement of the moving member 40 along the axis of the rotating shaft 12 is horizontal movement, and the movement of the moving member 40 in a direction perpendicular to the rotating shaft 12 is movement on the plane where the gravity direction is located. In other words, the axis of the rotating shaft 12 is nearly parallel to the ground.

[0084] For some examples, see Figure 4 and Figure 5 The target assembly 20 is provided with a accommodating cavity 20a and a liquid inlet 21a and a liquid outlet 21b respectively connected to the accommodating cavity 20a. The accommodating cavity 20a is used to accommodate cooling liquid. The target assembly 20 has a partition wall 20b. One side of the partition wall 20b in the thickness direction constitutes the cavity wall of the accommodating cavity 20a, and the other side is used to install each target material sheet 30.

[0085] It should be noted that the thickness direction of the partition wall 20 b is the same direction as the axial direction of the rotation shaft 12 .

[0086] When the electron beam acts on the target material sheet 30 , the coolant can take away the generated heat in time, which is beneficial to improve the heat dissipation efficiency and extend the service life of the target material sheet 30 .

[0087] For some examples, see Figure 4 and Figure 5 The target assembly 20 includes a first enclosure 21 and a first plate body 22 and a second plate body 23 that are spaced apart. The first enclosure 21 is connected to the first plate body 22 and the second plate body 23 respectively and the three together define a accommodating cavity 20a. The first plate body 22 constitutes a partition wall 20b, and the second plate body 23 is connected to one end of the rotating shaft 12.

[0088] The first plate body 22 and the second plate body 23 may be arranged at intervals along the axial direction of the rotating shaft 12, for example, and the first enclosure plate 21 may be respectively connected to the outer edge of the first plate body 22 and the outer edge of the second plate body 23 to form the accommodating cavity 20a.

[0089] In this embodiment, the target assembly 20 can be produced by dividing into multiple parts, and the structure of a single part is simpler; at the same time, the accommodating cavity 20a is formed by enclosing multiple parts, and each part is more convenient when demolding. In other words, the target assembly 20 of this embodiment is conducive to reducing the processing difficulty of the target assembly 20, thereby improving the processing efficiency of the target assembly 20.

[0090] In some embodiments, see Figure 4 The first enclosure 21 may be an integrally formed structure with the first plate body 22 , or the first enclosure 21 may be an integrally formed structure with the second plate body 23 .

[0091] In some other embodiments, please refer to Figure 5 The first enclosure 21, the first plate body 22 and the second plate body 23 can also be formed separately.

[0092] For some examples, see Figure 4 and Figure 5 The liquid inlet 21a and the liquid outlet 21b are both arranged on the first enclosure plate 21.

[0093] That is, the liquid inlet 21a and the liquid outlet 21b are located on the peripheral side of the target assembly 20. Since the target assembly 20 needs to be installed with the target sheet 30 and the rotating shaft 12 in the axial direction, the space on the peripheral side of the target assembly 20 is relatively abundant, so that the installation of the coolant pipeline can be facilitated. At the same time, it is helpful to reduce the influence of the coolant pipeline on the target sheet 30 or the rotating shaft 12, thereby improving the reliability of the target conversion device.

[0094] See also Figure 4 and Figure 5 The liquid inlet 21a and the liquid outlet 21b are coaxially arranged. In this way, the flow direction of the coolant can be kept consistent as much as possible, the flow resistance of the coolant is smaller, and the flow rate of the coolant is faster, so that the heat generated when the electron beam bombards the target sheet 30 can be taken away in time, thereby improving the heat dissipation efficiency and extending the service life of the target sheet 30.

[0095] For some examples, see Figure 4 and Figure 5 The target assembly 20 further includes a second enclosure 24 disposed on the first plate body 22. The second enclosure 24 and the first plate body 22 are arranged on a side away from the accommodating cavity 20a to form a mounting groove 20c. Each target sheet 30 is located in the mounting groove 20c.

[0096] See also Figure 4The second enclosure 24 can be an integrally formed structure with the first enclosure 21; of course, please refer to Figure 5 The second enclosure 24 may also be a separate structure from the first enclosure 21 .

[0097] See also Figure 4 and Figure 5 The second enclosure 24 and the first plate body 22 can also be an integrally formed structure or a split structure, and the present application does not limit this.

[0098] See also Figures 3 to 5 The second enclosure 24 is located on the peripheral side of the target sheet 30 , so that it can provide a certain degree of protection for the target sheet 30 , which is beneficial to reduce the probability of the target sheet 30 rubbing against other components of the accelerator during the process of following the rotation of the target assembly 20 .

[0099] In some embodiments, the first plate 22 is a sealing plate.

[0100] It should be noted that the first plate body 22 may be made of a sealing material, or a sealing material may be provided at the connection between the first plate body 22 and the first enclosure 21 .

[0101] In this embodiment, the sealing performance of the accommodating cavity 20a is better, thereby helping to reduce the probability of coolant leakage.

[0102] In some embodiments, the second plate body 23 is a sealing plate body. The second plate body 23 can be configured with reference to the first plate body 22, and the technical effects produced by the second plate body 23 can also be understood with reference to the first plate body 22, which will not be described in detail in this application.

[0103] For some examples, see Figure 3 and Figure 4 The first plate body 22 and the second plate body 23 are both circular, and the first plate body 22, the second plate body 23 and the rotating shaft 12 are coaxially arranged.

[0104] Here, it is easier to confirm the positions of the center points of the first plate body 22 and the second plate body 23 , thereby facilitating the installation of the rotating shaft 12 and the target sheet 30 .

[0105] When the conversion target device of the embodiment of the present application needs to use low-energy X-rays at the keV level to perform security checks on luggage items or to detect flaws in small workpieces, the energy switch of the accelerating tube in the accelerator head is turned on, and the driving assembly 10 and the moving part 40 of the conversion target device are adjusted to align the emitted electron beam with a corresponding low-energy target sheet 30. The accelerator will output low-energy X-rays at the keV level to penetrate the items to be inspected and provide imaging information.

[0106] When it is necessary to use MeV-level high-energy X-rays to conduct safety inspections on large equipment, goods, vehicles, etc., or to detect thicker and more complex workpieces, the energy switch of the accelerator tube is not turned on, and the drive assembly 10 and the moving part 40 of the target conversion device are adjusted to align the emitted electron beam with a corresponding high-energy target sheet 30. The accelerator outputs MeV-level high-energy X-rays, which penetrate the object and display the imaging results, thereby completing the corresponding inspection or detection.

[0107] A second aspect of the embodiments of the present application provides an accelerator, which includes a conversion target device according to any one of the embodiments of the present application.

[0108] It should be noted that after the accelerator adopts the conversion target device of any embodiment of the present application, the accelerator has the corresponding advantages of the conversion target device of the embodiment.

[0109] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A target conversion device, characterized in that: include: A driving assembly, comprising a driving member and a rotating shaft, wherein the driving member is drivingly connected to the rotating shaft and is used to drive the rotating shaft to rotate; A target assembly is disposed at one end of the rotating shaft and can rotate synchronously with the rotating shaft; A plurality of target sheets are arranged on the target assembly at intervals along the circumference of the rotating shaft. The target assembly rotates so that the electron beam can bombard different positions on any one of the target sheets. The thickness of each target sheet is different. The electron beam bombards different target sheets to generate X-rays of different energies.

2. The target conversion device according to claim 1, characterized in that: The target sheets are made of different materials; and / or, At least part of the target material pieces generate keV-level X-rays under the bombardment of the electron beam, and at least part of the target material pieces generate MeV-level X-rays under the bombardment of the electron beam.

3. The target conversion device according to claim 1, characterized in that: The target sheet is made of copper, tungsten, tantalum or gold; and / or, At least a portion of any of the target material sheets is exposed on the outer surface of the target assembly.

4. The target conversion device according to claim 1, characterized in that: At least part of the target material pieces are circular in structure; and / or, The centers of the target material sheets are located on the same circumference, and the center of the circle corresponding to the circumference is located on the axis of the rotating shaft.

5. The target conversion device according to any one of claims 1 to 4, characterized in that: The conversion target device also includes a moving member, which can generate movement along the axial direction of the rotating shaft or perpendicular to the axial direction of the rotating shaft. The driving member is arranged on the moving member and can follow the moving member to generate movement along the axial direction of the rotating shaft or perpendicular to the axial direction of the rotating shaft.

6. The target conversion device according to any one of claims 1 to 4, characterized in that: The target assembly is provided with a accommodating cavity and a liquid inlet and a liquid outlet respectively connected to the accommodating cavity, the accommodating cavity is used to accommodate cooling liquid, and the target assembly has a partition wall, one side of the partition wall in the thickness direction constitutes the cavity wall of the accommodating cavity, and the other side is used to install each of the target material sheets.

7. The target conversion device according to claim 6, characterized in that: The target assembly includes a first enclosure and a first plate body and a second plate body that are spaced apart. The first enclosure is connected to the first plate body and the second plate body respectively and the three together define the accommodating cavity. The first plate body constitutes the partition wall, and the second plate body is connected to one end of the rotating shaft.

8. The target conversion device according to claim 7, characterized in that: The liquid inlet and the liquid outlet are both arranged on the first enclosure plate, and the liquid inlet and the liquid outlet are coaxially arranged; and / or, The target assembly further includes a second enclosure plate disposed on the first plate body, the second enclosure plate and a side of the first plate body facing away from the accommodating cavity are surrounded to form an installation groove, and each of the target material sheets is located in the installation groove.

9. The target conversion device according to claim 7, characterized in that: The first plate body and / or the second plate body are sealing plates; and / or, The first plate body and the second plate body are both circular, and the first plate body, the second plate body and the rotating shaft are coaxially arranged.

10. An accelerator, characterized in that: The accelerator comprises the conversion target device according to any one of claims 1 to 9.

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