Radiation scanning device and radiation scanning system

Abstract

The radiation scanning device used in the luggage transportation system of the present application includes a transmission device that transports the test object through a scanning area of ​​the radiation scanning device, and a plurality of scanning stages that are respectively arranged in a plurality of scanning planes in the transport direction of the test object, each scanning stage including a radiation source module (10) and a detector group (30) arranged opposite each other, the radiation source module (10) including a plurality of source points that emit radiation beams, and the radiation source modules (10) of the plurality of scanning stages are respectively arranged below, to the left and to the right of the scanning area.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of Chinese Patent Application No. 202110769688.X, entitled "Radiation Scanning Device and Radiation Scanning System", filed on July 7, 2021, and all the contents of the said application are incorporated herein by reference.

[0002] This application relates to the field of radiation image formation, and particularly to a radiation scanning device for a cargo transportation system and a radiation scanning system for cargo inspection.

[0003] Radiation scanning technology can play an important role in security inspections because it can eliminate the influence of object overlap. Conventional radiation scanning devices use a slip - ring device to obtain projection data at different angles by rotating an X - ray device and a detector, and obtain a tomographic image by a reconstruction method to obtain the internal information of the detected cargo. In line with dual - energy or multi - energy imaging technology, current cargo inspection facilities can reconstruct the atomic number and electron density of the object to be inspected. Therefore, the identification of the type of substance can be realized, and excellent effects can be achieved in the detection of explosives, dangerous goods, etc.

Summary of the Invention

[0004] Conventional radiation scanning devices still have some drawbacks. For example, the current airport cargo transportation system usually has a high cargo transportation speed to meet timeliness requirements, and correspondingly, high detection speed is required for security inspection facilities. On the other hand, improving the detection speed may bring problems such as increased radiation and cost.

[0005] In view of the above problems, the present application provides a radiation scanning apparatus for a luggage transportation system, which includes a transmission device configured to convey an object to be inspected through a scanning area of the radiation scanning apparatus, and a plurality of scanning stages respectively disposed on a plurality of scanning planes in the transportation direction of the object to be inspected. Each scanning stage includes a radiation source module and a detector group disposed opposite to each other. The radiation source module includes a plurality of source points that emit radiation beams. The radiation source modules of the plurality of scanning stages are respectively disposed below, to the left, and to the right of the scanning area.

[0006] An embodiment of the present application is a radiation scanning system for luggage inspection, which includes the radiation scanning apparatus and the luggage transportation system according to the embodiments of the present application. The luggage transportation system includes a transmission belt for transporting luggage, and the transmission device of the radiation scanning apparatus matches the height and speed of the transmission belt.

[0007] An embodiment of the present application is a mounting positioning structure of a radiation source of a radiation scanning apparatus. The radiation scanning apparatus includes a radiation source and a fixed support frame. The mounting positioning structure includes a main body, which is fixedly connected to the radiation source and the support frame such that the radiation source can be fixedly mounted on the support frame by the main body. The mounting positioning structure further includes a moving device configured to move the radiation source to a predetermined mounting position in a first plane by a moving device, a first positioning device used to position the radiation source in the first plane, a lifting device used to adjust the position of the radiation source along a first direction perpendicular to the first plane, and a second positioning device used to fix the position of the radiation source in the first direction.

[0008] Using the mounting positioning structure according to the above embodiment, each radiation source of the radiation scanning apparatus can be individually removed or installed, and the beam emission angle of the radiation source can also be adjusted.

[0009] An embodiment of the present application is an attachment and fixing structure of a detector used in a radiation scanning device. The radiation scanning device includes a detector and a support frame to be fixedly installed. The detector includes one or more detector groups. The detector groups are fixedly attached to the support frame via the attachment and fixing structure or removed from the support frame. The attachment and fixing structure includes a first attachment portion fixedly provided on the detector group, a second attachment portion fixedly provided on the support frame and capable of linearly moving and fitting with the first attachment portion, and when the first attachment portion and the second attachment portion are fitted to each other, the detector group is movable along the second attachment portion to a predetermined attachment position, and a fixing device provided on one side along the width direction of the detector group and used to fix the detector group with respect to the attachment reference surface on the support frame. The attachment and fixing structure is further provided.

[0010] Using the attachment and fixing structure according to the above embodiment, each detector group of the detector can be individually removed or attached, and can be installed so as to be detached and maintained along the transport direction of the object to be inspected or the direction perpendicular to the transport direction as needed, improving the convenience of detachment, attachment and maintenance of the detector group.

[0011] Other features and technical advantages of the present application will become clearer from the following detailed description of the accompanying drawings and other embodiments.

Brief Description of the Drawings

[0012]

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Best Mode for Carrying Out the Invention

[0013] To clearly explain the technical problems to be solved, the technical solution, and the beneficial effects of the present application, the present application will be further described in detail below with reference to the drawings and embodiments. As can be understood, the specific embodiments described in this specification are only for explaining the present application and do not limit the scope of the present application.

[0014] In response to the technical problems in the prior art, the embodiments of the present application provide a radiation scanning device for a luggage transportation system. The radiation scanning device includes a transmission device that conveys an object to be inspected so that the object passes through the scanning area of the radiation scanning device, and a plurality of scanning stages arranged on a plurality of scanning planes along the transportation direction of the object to be inspected. Each scanning stage includes a corresponding radiation source module and a detector. In the process of the object to be inspected passing through the scanning area by the transmission device, the plurality of scanning stages scan the object to be inspected and generate corresponding digital signals. The radiation scanning device can further include a control device that can obtain the internal information of the object to be inspected by performing image reconstruction based on the digital signals generated at each scanning stage. In this specification, the object to be inspected is an article that requires security inspection, such as luggage and packages, and the scanning area is defined by the radiation source module and the detector of each scanning stage.

[0015] Specifically, each scanning stage includes a radiation source module and a detector that are arranged opposite to each other. Here, each radiation source module of each scanning stage includes a plurality of source points that emit radiation beams. The plurality of radiation source modules of the plurality of scanning stages are arranged below, to the left, and to the right of the scanning region, respectively. Optionally, when viewed along the transport direction of the object to be inspected, the plurality of radiation source modules of the plurality of scanning stages form a semi-closed structure that opens upward around the scanning region. Since there is at least one scanning stage and its radiation source module is arranged below the scanning region, the transmission device of the radiation scanning apparatus of the present application can be installed so as to have a high height from the surface (such as the ground) on which the radiation scanning apparatus is placed, and can match the height of the object to be inspected transport line (such as a luggage transport system, etc.) having a high height located upstream or downstream of the radiation scanning apparatus (for example, the same as the height of the transmission belt of the luggage transport system). Also, in this specification, above, below, to the left, and to the right of the scanning region mean above, below, to the left, and to the right of the scanning region when viewed in the transport direction of the object to be inspected.

[0016] Also, the detectors of each scanning stage are arranged to face the radiation source modules respectively, and are arranged so as to be able to receive almost all of the radiation that has passed through the object to be inspected. Thereby, the radiation scanning apparatus according to the present application can obtain very comprehensive scanning data and ensure the image quality. In this way, although the present application arranges radiation sources only on three sides of the scanning region, it is still possible to ensure the image quality compared to the case where radiation sources are arranged on four sides of the scanning region, and the cost of the radiation sources can be saved. Also, since the radiation source module is not arranged above the scanning region, the maintenance of the radiation source module can be facilitated.

[0017] In addition, the control device is connected to each scanning stage and controls the beam emission order of the source points of the radiation source modules of each scanning stage. In particular, one source point of each radiation source module of each scanning stage is made to emit a beam simultaneously. Thereby, the scanning speed of the radiation scanning device can be improved, and accordingly, the detection speed can be improved. The radiation scanning device can be matched with an object transport line having a high transport speed located upstream or downstream of the radiation scanning device (for example, a luggage transport system, etc.) (for example, the speed of the transmission device is the same as the speed of the transmission belt of the luggage transport system).

[0018] In addition, the radiation source modules of each scanning stage may be installed to emit radiation beams of different energies. Optionally, the radiation source modules located on the left or right side of the scanning area emit radiation beams having higher energy than the radiation source modules located below the scanning area. In this way, when detecting a luggage with a small thickness and a large width, the transmittance of the radiation in the width direction of the luggage is ensured, and the number of radiations that the detector can detect is increased, so that the image quality can be improved.

[0019] Hereinafter, embodiments of the present application will be described in detail with reference to the drawings.

[0020] Figures 1A - 1C schematically show structural diagrams of a radiation scanning device according to some embodiments of the present application. Figure 1A shows an overall structural diagram of the radiation scanning device, and Figures 1B and 1C respectively show structural diagrams of the second scanning stage and the third scanning stage of the radiation scanning device in Figure 1A. As shown in the figures, the radiation scanning device includes a plurality of scanning stages (for example, a first scanning stage A, a second scanning stage B, and a third scanning stage C), a channel 110, and a transmission device. The first scanning stage A is not shown alone, but the first scanning stage A and the third scanning stage C are symmetrically arranged. The transmission device is also not shown, but the transmission device is arranged close to the lower surface of the channel 110 in the channel 110 and extends through the channel 110. Each scanning stage includes a respective radiation source module and a detector. The transmission device transports the object to be inspected so as to pass through the scanning area of each scanning stage and scans the object to be inspected. In Figure 1A, the advancing direction Z of the object to be inspected is shown. The transport direction of the object to be inspected (hereinafter, may be simply referred to as the transport direction or the Z direction) is defined as a direction parallel to the advancing direction of the object to be inspected and includes the advancing direction and its reverse direction. Figure 1A also shows an XYZ coordinate system that can be used to explain the positions of the members in the radiation scanning device as a reference coordinate system. These position explanations are for clearly explaining the principle of the present application and do not have a limiting effect. The advancing direction Z of the object to be inspected is the same as the Z direction of this XYZ coordinate system.

[0021] The radiation scanning device shown in Figure 1A may further include a control device (not shown), and the control device can control the operations of each member of the radiation scanning device, for example, the emission of radiation from each scanning stage, the data output of the detector, etc. The control device can further include an image processing module. The image processing module can perform image reconstruction based on the output information of the detectors of each scanning stage, obtain a scanning image of the object to be inspected, and determine the internal information of the object to be inspected.

[0022] According to specific embodiments, each scanning stage of the radiation scanning device is arranged on a plurality of scanning planes along the transport direction of the object to be inspected. Each scanning plane is provided at a predetermined distance interval along the transport direction of the object to be inspected. Here, when the optical paths and / or members of each scanning stage do not interfere with each other, the smaller the distance, the better in order to reduce the optical path distribution length of the radiation scanning device.

[0023] Each scanning stage includes a radiation source module and a detector group arranged correspondingly. In each scanning stage, the radiation source module and the detector may be arranged in the same plane perpendicular to the Z direction. Thereby, the radiation exit of the radiation source module faces the crystal of the detector directly, and the influence on the reconstructed image caused by the radiation being inclined with respect to the crystal surface of the detector is avoided. Of course, according to other embodiments, the radiation source module and the detector may be arranged in different planes perpendicular to the Z direction, that is, the radiation source module and the detector may be offset from each other by a predetermined distance along the Z direction.

[0024] The radiation source module includes a plurality of source points that emit radiation beams. Specifically, the radiation source module may be a distributed radiation source. Each radiation source module has a plurality of target points. Each target point can generate a radiation beam independently, and the plurality of target points can generate radiation beams according to a predetermined time series under the control of the control device. As shown in FIG. 2, the radiation beam may be a fan beam having an opening angle A. Of course, the shape of the radiation beam is not limited to the fan beam, and may be other shaped radiation beams such as a cone beam or a parallel beam, and may be specifically installed as required. Optionally, the radiation source module is a linear distributed radiation source, that is, a plurality of target points are arranged in a straight line. According to other embodiments, the radiation source module may be a polyline-shaped or arc-shaped distributed radiation source. Alternatively, each radiation source module may be a radiation source group including a plurality of single-point sources.

[0025] Also, in each scanning stage, all the radiation source modules are arranged in one direction of the scanning region, and the radiation source modules in each scanning stage are arranged in different directions of the scanning region. For example, they are arranged on the left side (the first scanning stage A), the lower side (the second scanning stage B), and the right side (the third scanning stage C) of the scanning region, respectively. Optionally, when viewed along the transport direction of the object to be inspected, the radiation source modules of these scanning stages are arranged in a semi-closed structure that opens upward around the scanning region. Depending on the shape of the radiation source module (such as linear, polygonal, or arc-shaped), the semi-closed structure may be a U-shaped structure, a semi-circular structure, a semi-elliptical structure, etc. For example, as shown in FIGS. 3A and 3B, when the radiation source module is linear or polygonal, when viewed along the transport direction of the object to be inspected, the radiation source modules of the plurality of scanning stages may be arranged in a U-shaped structure. Also, optionally, when viewed along the transport direction of the object to be inspected, the target points of the plurality of radiation source modules of the plurality of scanning stages may partially overlap at adjacent ends. Specifically, taking the arrangement of the radiation source module shown in FIG. 3A as an example, when observed along the transport direction of the object to be inspected, the radiation source module on the left side of the scanning region and the radiation source module on the lower side of the scanning region may have partial overlap of the target points at the adjacent ends (i.e., the lower left corner of the U-shaped structure in the figure), and the radiation source module on the right side of the scanning region and the radiation source module on the lower side of the scanning region may have partial overlap of the target points at the adjacent ends (i.e., the lower right corner of the U-shaped structure in the figure). In this way, it is further ensured that the object to be inspected is completely covered by the radiation, avoiding the lack of projection data at the position corresponding to the end of the radiation source, which is beneficial to improving the image quality.

[0026] Also, in each scanning stage, the detector is arranged to rotate around the scanning area in at least two directions. For example, in the first scanning stage A, the detector surrounds the scanning area upward and rightward to present an L-shaped structure. In the second scanning stage B, the detector surrounds the scanning area upward, leftward, and rightward to present a U-shaped structure that opens downward. And in the third scanning stage C, the detector surrounds the scanning area upward and leftward to present an L-shaped structure. By arranging the detector to rotate around the scanning area in at least two directions, it is ensured that the detector can detect almost all the radiation passing through the object to be inspected. Thus, very comprehensive scanning data can be obtained and the image quality can be ensured. Also, in FIG. 1A, although the detectors in the first scanning stage A and the third scanning stage C are arranged in an L-shaped structure, they may also be in a U-shaped structure that opens toward the radiation source module. Thereby, it is possible to further ensure the comprehensiveness of the scanning data, which is more advantageous for improving the image quality.

[0027] The detector may include a plurality of detector groups, each of which is a detector array including a plurality of detector units. The detector array may be a linear, arc-shaped, or polyline-shaped detector array. In the embodiments shown in FIGS. 1A-1C, the detectors of each scanning stage are composed of a plurality of linear detector arrays. For example, in the first scanning stage A and the third scanning stage C, the detector includes two detector groups, each of which is a linear detector array, and in the second scanning stage B, the detector includes three detector groups, each of which is a linear detector array. Here, the detector group in the form of a linear detector array can adopt any appropriate structure. According to some embodiments, its specific structure is as shown in FIG. 4. As shown in FIG. 4, the detector group 30 includes a detector arm 32 and a plurality of detector units 31, and the plurality of detector units 31 are arranged linearly on the detector arm 32. The specific structure of the detector unit 31 may adopt other appropriate structures as shown in FIG. 5. As shown in FIG. 5, the detector unit 31 includes a detector crystal 311 for receiving radiation. The plurality of detector units 31 are arranged side by side on the detector arm 32 such that the detector crystals 311 face the same direction. The structure of the detector arm 32 is not limited to the embodiment shown in FIG. 5, and other appropriate structures (detector arm structures shown in FIGS. 7A-9B) may be adopted. The detector group of the radiation scanning device of the present application is not limited to the form of a linear detector array, and may be in the form of an arc-shaped detector array. The arc-shaped detector array may include a plurality of arc-shaped detector units and an arc-shaped detector arm, and the plurality of arc-shaped detector units are arranged in parallel on the arc-shaped detector arm. Here, the detector crystals of the detector units face the same direction.

[0028] In the radiation scanning apparatus of the above embodiment, since the radiation source module of the second scanning stage B is disposed below the scanning region, the height of the transmission device can be increased with respect to a device in which a radiation source is not provided below the scanning region. Accordingly, when the radiation scanning apparatus is applied to a luggage transport system or the like having a high transmission belt, the movement of the luggage between the transport system and the radiation scanning apparatus can be facilitated. Here, optionally, the transmission device may have the same height as the transmission belt of the luggage transport system and may be installed to further facilitate the movement of the luggage.

[0029] In the above embodiment, the radiation source modules of the respective scanning stages are detachably independent of each other, that is, each radiation source module has an individual cavity for accommodating each radiation generating device. That each radiation source module has a single cavity means that a plurality of target points of each radiation source module share one single vacuum cavity. This can reduce the size of the housing of a single radiation source module and the volume of the internal vacuum cavity, and reduce the volume and weight of a single radiation source module with respect to a radiation source of an integral annular cavity (that is, all target points of the radiation source are located within the same annular vacuum cavity), which is convenient for removing and attaching the radiation source; also, by each radiation source module adopting a single vacuum cavity, there is an advantage that the risk of fire in the cavity can be reduced when maintaining the radiation source module.

[0030] According to some embodiments, each radiation source module of the scanning stage is provided with a mounting positioning structure for facilitating the mounting and adjustment of the radiation source module. With the mounting positioning structure, each radiation source module can be mounted and fixed at a predetermined position in the radiation scanning device (for example, a specific position based on the XYZ reference coordinate system in the radiation scanning device), and the relative position between the radiation source module and the detector can be ensured. Further, with the mounting positioning structure, the radiation source module can also be rotated to adjust the beam emission angle of the radiation beam. Thus, when the radiation source module and the detector are located in different planes perpendicular to the Z direction, it is possible to adjust the beam emission angle of the radiation beam by the mounting positioning structure, and the center of the radiation beam irradiates the crystal plane of the detector group.

[0031] Since the radiation source modules of the respective scanning stages have different positions in the radiation scanning apparatus, different mounting methods can be adopted, and they can have different mounting positioning structures. For example, the radiation source modules located on the left and right sides of the scanning area may be mounted by a suspension method using equipment such as an overhead traveling vehicle. However, the radiation source module located below the scanning area is not suitable for adopting the suspension method and needs to be mounted using other methods. To facilitate the mounting of such radiation source modules, the embodiments of the present application provide a mounting positioning structure. It can easily mount and fix a radiation source module not suitable for suspension at a predetermined position of the radiation scanning apparatus, and can also rotate the radiation source module to adjust the beam emission angle of the radiation beam. According to some embodiments, the mounting positioning structure includes a main body, and the main body is fixedly connected to the radiation source module and the support frame of the radiation scanning apparatus (the support frame refers to a fixed support device in the radiation scanning apparatus for mounting and fixing members such as a radiation source and a detector), and the radiation source module can be fixedly mounted to the support frame through the main body. Here, the mounting positioning structure includes a moving device that can move the radiation source module to a predetermined mounting position in a first plane (for example, the XZ plane in FIG. 1A) by the moving device, a first positioning device that positions the radiation source module in the first plane, a lifting device used to adjust the position of the radiation source module along a first direction perpendicular to the first plane (for example, the Y direction in FIG. 1A, which is perpendicular to the XZ plane), and a second positioning device used to fix the position of the radiation source module in the first direction.

[0032] Figures 6A-6C show one specific embodiment of the mounting positioning structure of the radiation source module 10. As shown in Figures 6A-6C, the mounting positioning structure includes main bodies 11 and 12, which are respectively located at both ends along the length direction of the radiation source module 10 and are fixedly connected to the radiation source module 10. The radiation source module 10 is fixedly mounted on the support frame of the radiation scanning device via the main bodies 11 and 12. Specifically, the moving device of the mounting positioning structure is provided as rollers 13 and 14, which are respectively provided on the main bodies 11 and 12. The radiation source module 10 can be pushed by the rollers 13 and 14 to move to a predetermined mounting position in the XZ plane. Of course, the moving device of the mounting positioning structure is not limited to rollers. According to other embodiments, the radiation source module may be moved in a sliding manner. For example, a linear sliding fit may be provided between the mounting positioning structure and the support frame to move the radiation source module 10 to a predetermined mounting position.

[0033] The first positioning device includes first positioning pins 15 and 16 and corresponding first pin holes (not shown) provided on the main bodies 11 and 12 and the support frame of the radiation scanning device respectively. After the radiation source module 10 is moved to a predetermined mounting position via the rollers 13 and 14, when the first positioning pins 15 and 16 are inserted into the corresponding first pin holes respectively, the radiation source module 10 can be positioned in the XZ plane.

[0034] The lifting device includes a roller 13 provided on the main body 11, specifically, on a liftable roller, and further includes a jacking screw 17 provided on the main body 12. One end of the jacking screw 17 abuts against the support frame, and by rotating the jacking screw 17, the main body 12 and the radiation source module 10 can be lifted with respect to the support frame. By adjusting the liftable roller 13 and the jacking screw 17, the position of the radiation source module 10 with respect to the support frame can be adjusted along the Y direction. The second positioning device is formed on the positioning blocks 19 and 20. After adjusting the liftable roller 13 and the jacking screw 17 to adjust the radiation source module 10 to a predetermined position along the Y direction, the positioning blocks 19 and 20 are respectively placed below the main bodies 11 and 12, and the height of the radiation source module 10 with respect to the support frame is fixed, so that the radiation source module 10 can be positioned along the first direction Y. Here, optionally, the positioning block 20 below the main body 12 may be installed in a U-shaped configuration, and the lower part of the jacking screw 17 is located in the opening of the U-shaped positioning block 20 to prevent the two from interfering with each other. Further, the mounting positioning structure may further include first fixing bolts 21 and 22 and corresponding first screw holes provided on the main bodies 11 and 12, the positioning blocks 19 and 20, and the support frame. The first fixing bolts 21 and 22 can be inserted into the corresponding first screw holes and tightened respectively to fix the positioning blocks 19 and 20 with respect to the main bodies 11 and 12 and the support frame, and the radiation source module 10 can be fixedly connected to the support frame.

[0035] Also, according to some embodiments, the mounting positioning structure further includes an adjusting device for rotating the radiation source module along a predetermined axis to adjust its beam emission angle. According to the specific embodiments of FIGS. 6A-6C, a mounting shaft 27 is provided on the radiation source module 10, shaft holes are respectively provided on the main bodies 11 and 12, and the main bodies 11 and 12 are mounted on the mounting shaft 27 through the shaft holes; further, the mounting positioning structure further includes second positioning pins 23 and 24, and second pin holes corresponding to the second positioning pins 23 and 24 are respectively provided on the main bodies 11 and 12 and the radiation source module 10. By fitting the shaft holes of the main bodies 11 and 12 onto the mounting shaft 27 and inserting the second positioning pins 23 and 24 into the corresponding second pin holes respectively, the main bodies 11 and 12 can be positioned relative to the radiation source module 10. Also, the mounting positioning structure further includes second fixing bolts 25 and 26 for fixedly connecting the main bodies 11 and 12 to the radiation source module 10, and corresponding second screw holes provided on the main bodies 11 and 12 and the radiation source module 10. By screwing the second fixing bolts 25 and 26 into the corresponding second screw holes, the main bodies 11 and 12 can be fixedly connected to the radiation source module 10. By pulling out the second positioning pins 23 and 24 and loosening the second fixing bolts 25 and 26, the main bodies 11 and 12 can be loosened relative to the radiation source module 10. In this state, the adjusting device can drive the radiation source module 10 to rotate around the mounting shaft 27 relative to the main bodies 11 and 12.

[0036] In a specific embodiment, the adjusting device includes a rotational drive device and includes an adjustment block 28 fixed to the radiation source module 10 and a screw jack 29 provided on the main body 11 and abutting against the adjustment block 28. The screw jack 29 can rotate to push the adjustment block 28 to move and rotate the radiation source module 10. Here, the rotational drive The device The deviceIt is provided only on one main body of the mounting positioning structure, that is, only at one end in the length direction of the radiation source module 10. Since both ends of the radiation source module 10 are supported by the mounting shaft 27, by pushing and rotating the radiation source module 10 at one end, the entire radiation source module 10 can rotate correspondingly. After rotating the radiation source module 10 by a predetermined angle, the second positioning pins 23 and 24 are inserted into the corresponding second pin holes again, and the second fixing bolts 25 and 26 are screwed into the corresponding second screw holes again, and the main bodies 11 and 12 can be fixedly connected to the radiation source module 10.

[0037] In the above embodiment, the mounting shaft 27 in the radiation source module 10 can overlap with the virtual connection line of a plurality of target points in the radiation source module 10. Therefore, by rotating the radiation source module 10 around the mounting shaft 27, the radiation source module 10 can be rotated around the target axis.

[0038] Also, although the mounting positioning structure according to the above embodiment has been described by taking the radiation source module 10 as an example, the above mounting positioning structure can be applied to the mounting, positioning, and adjustment of the radiation source of any suitable radiation scanning device. Of course, the mounting, positioning, and adjustment of the radiation source module 10 are not limited to the mounting positioning structure of the above embodiment, and other suitable structures may be adopted. For example, in the embodiment shown in FIGS. 6A-6C, the lifting device is realized by a liftable roller 13 and a jacking screw 17, but the lifting device is not limited to the specific structure of this embodiment and may be realized as other suitable structures. For example, jacking screws are adopted for both of the two main bodies to perform lifting. Similarly, the specific implementations of the moving device, the first positioning device, the second positioning device, and the adjustment device are not limited to the specific structures in the above embodiment, and other suitable structures may be adopted as long as their functions can be realized.

[0039] According to some embodiments, each detector group of the detectors of each scanning stage can be individually removed or attached, thereby improving the maintainability of the detectors. Further, the radiation scanning apparatus of the present application includes an attachment and fixing structure for a single detector group, and by means of the attachment and fixing structure, the detector group can move with respect to its attachment position in the radiation scanning apparatus (for example, the support frame of the radiation scanning apparatus) and be removed from or attached to the attachment position.

[0040] Hereinafter, the attachment and fixing structure of the detector group according to some embodiments of the present application will be described in detail. The attachment and fixing structure of the detector group according to some embodiments of the present application specifically includes a first attachment portion fixed to the detector group, a second attachment portion fixed to the support frame of the radiation scanning apparatus, the second attachment portion being in linear movement fit with the first attachment portion, and the detector group being movable along the second attachment portion to a predetermined attachment position in a state where the first attachment portion and the second attachment portion are fitted to each other, and a fixing device installed on one side along the width direction of the detector group for fixing the detector group with respect to the attachment reference surface in the support frame. In some specific embodiments, the detector group is attached and fixed to the support frame of the radiation scanning apparatus via a detector arm, the first attachment portion is fixed to the detector arm of the detector group, the fixing device is provided on one side along the width direction of the detector arm, and the detector arm is fixed to the support frame to fix the detector group.

[0041] FIGS. 7A-7D show an attachment and fixing structure used for a detector group 40 according to some specific embodiments. FIG. 7A shows a perspective view of the attachment state of the detector group, FIG. 7B is a side view of the attachment state of the detector group, FIG. 7C is a perspective view of the removal state of the detector group, and FIG. 7D is a cross-sectional view of the attachment state of the detector group with the fixing device. The attachment and fixing structure shown in FIGS. 7A-7D is applied, for example, to the detector group located above the scanning regions in the scanning stages A, B, and C. With the attachment and fixing structure of this embodiment, the detector group located above the scanning region can move perpendicular to the transport direction of the object to be inspected and be removed or attached, and can be fixed or adjusted to the side surface of the detector along the transport direction of the object to be inspected.

[0042] As shown in FIG. 7A, the first mounting portion of the mounting and fixing structure of the detector group 40 includes a slider 42 provided on the detector arm 41. The slider 42 extends along the length direction of the detector arm 41. In a state where the detector group 40 is attached to the radiation scanning device, the length direction of the detector arm 41 is perpendicular to the transport direction of the object to be inspected, and the width direction coincides with the transport direction of the object to be inspected. In FIG. 7A, the slider 42 extends a part of the length of the detector arm 41. In other embodiments, it may be installed to extend the entire length or other lengths of the detector arm 41. Note that the slider 42 may be fixed to the detector arm 41 by bolt connection or the like. According to other embodiments, the slider 42 may be integrally formed with the detector arm 41.

[0043] The second mounting portion is formed on a fixed guide rail 43 that fits with the slider 42. The fixed guide rail 43 is fixedly connected to a support frame (not shown in FIG. 7A) of the radiation scanning device and may be integrally formed with the support frame. The length direction of the fixed guide rail 43 is perpendicular to the transport direction of the object to be inspected by the radiation scanning device. A position limiting portion (not shown) may be provided at one end along the length direction of the fixed guide rail 43. When mounting the detector group 40, align the slider 42 with the fixed guide rail 43 and push the detector group 40 along the fixed guide rail 43 until the detector arm 41 abuts against the position limiting portion, thereby moving the detector group 40 to a predetermined mounting position.

[0044] The fixing device is provided on one side along the width direction of the detector group 40 and abuts against the surface 44 on one side along the width direction of the detector arm 41. Specifically, the fixing device includes a positioning member 45 and a fastener 46. The positioning member 45 is fixedly connected to the support frame, and an end surface away from the support frame is formed on a mounting reference surface 47 for abutting against the surface 44 on one side along the width direction of the detector arm 41. The surface 44 is the mounting surface of the detector arm 41 and is processed to have good flatness together with the mounting reference surface 47. Thereby, when the mounting surface 44 of the detector arm 41 abuts against and is fixed to the mounting reference surface 47, the detector group 40 can be accurately positioned in the width direction, that is, the transport direction of the object to be detected. The fastener 46 can penetrate the positioning member 45 and fasten the detector group 40 against the end surface of the positioning member 45 (i.e., the mounting reference surface 47). Specifically, the fastener 46 may be, for example, a fastening bolt. Threaded holes corresponding to the positioning member 45 and the side surface of the detector arm 41 facing the positioning member 45 are provided, and the fastening bolt 46 can be passed through the corresponding threaded holes and tightened to fasten the detector group 40 against the end surface of the positioning member 45 (i.e., the mounting reference surface 47). A plurality of fixing devices, for example, at least two, may be provided along the length direction of the detector group 40 to firmly fix the detector group 40 to the support frame.

[0045] With the above mounting and fixing structure, when mounting the detector group 40, with the detector units of the detector group 40 facing downward, first, align the slider 42 in the detector group 40 with the fixed guide rail 43, and move the detector group 40 along the fixed guide rail 43 until it abuts against the position limiting portion on the fixed guide rail 43. Then, pass the fastening bolt 46 through the corresponding threaded holes in the positioning member 45 and the detector arm 41 and tighten it to position the detector group 40 against the end surface of the positioning member 45, that is, the mounting reference surface 47. When removing the detector group 40, the reverse operation may be performed.

[0046] Since the length direction of the fixed guide rail is perpendicular to the transport direction of the object to be inspected by the radiation scanning device and does not obstruct the radiation source on one side along the X direction of the detector group 40, due to the above mounting and fixing structure, the detector group 40 can be removed or attached to the support frame perpendicular to the transport direction of the object to be inspected by the radiation scanning device. Also, the fixing device is installed on one side along the width direction of the detector group, that is, on one side along the Z direction of the detector, which is convenient for fixing or adjusting the detector group. Therefore, with the mounting and fixing structure according to the above embodiment, the detachment and maintenance of the detector group can be easily performed.

[0047] Also, optionally, in the above mounting and fixing structure, the second mounting portion is arranged to support the detector group 40 at a predetermined mounting position in a state of being fitted with the first mounting portion. Specifically, the slider 42 is provided on both sides facing the width direction of the detector arm 41 and has inner extending portions 421, 422 (see FIG. 7B) extending inward from the edges on both sides facing the width direction of the detector arm 41; the fixed guide rail 43 includes outer extending portions 431, 432 (see FIG. 7B) extending outward on both sides facing the width direction; in a state where the slider 42 and the fixed guide rail 43 are fitted, the inner extending portions 421, 422 of the slider 42 are located above the outer extending portions 431, 432 of the fixed guide rail 43, and the two are in contact and overlap. Thereby, after the detector group 40 moves along the fixed guide rail 43 to a predetermined mounting position, the detector group 40 is suspended by the outer extending portions 431, 432 of the fixed guide rail 43 by the inner extending portions 421, 422 of the slider 42. In this way, the fixed guide rail 43 can support the detector group 40 at a predetermined mounting position without the need for other additional auxiliary structures or tools, and when tightening the detector group 40, the operator does not need to hold and operate the detector group 40, thus improving the convenience of operation.

[0048] Also, in the above mounting and fixing structure, the linear movement fitting between the first mounting portion and the second mounting portion employs a slider guide rail fitting. According to other embodiments, other linear movement fittings, such as linear slide or linear rotation fitting, etc., may be employed, for example, the fitting between a linear ball bearing and a cylindrical shaft, etc.

[0049] The mounting and fixing structure of the above embodiments is applied to the detector group located above the scanning area. FIGS. 8A-8D show the fixing and mounting structure for the detector group according to some other embodiments. FIG. 8A shows a perspective view of the detector group in the mounted state, FIG. 8B is a schematic diagram of the state where the first mounting portion and the second mounting portion of the mounting and fixing structure are separated, and FIGS. 8C and 8D are perspective views of different viewing angles in the state where the first mounting portion and the second mounting portion of the mounting and fixing structure are fitted.

[0050] The mounting and fixing structure shown in FIGS. 8A-8D is applied to, for example, the detector group located on the left or right side of the scanning area in the scanning stages A, B, and C. With the mounting and fixing structure of this embodiment, the detector group located on the left or right side of the scanning area can move perpendicular to the transport direction of the object to be inspected for removal or installation, and can be fixed or adjusted to the side surface of the detector along the Z direction.

[0051] Specifically, the first mounting portion of the mounting and fixing structure of the detector group 50 is formed on a fixed block 52 provided on one side along the width direction of the detector arm 51 and having an opening 53 directed toward one side along the thickness direction of the detector arm 51. In the mounted state of the detector group 50, the width direction of the detector arm 51 coincides with the transport direction of the object to be inspected of the radiation scanning device, and the length direction and the thickness direction are perpendicular to the transport direction of the object to be inspected. The opening 53 of the fixed block 52 may be U-shaped or other suitable shapes. The fixed block 52 may be fixedly connected to the detector arm 51 by a method such as bolt fixing, or may be integrally formed with the detector arm 51.

[0052] The second mounting portion is formed on a cantilever portion 54 fixed to the support frame of the radiation scanning device. At an end of the cantilever portion 54 away from the support frame, an extending portion 55 capable of linearly moving and fitting into an opening 53 in the fixed block 52 is provided. That is, the extending portion 55 can move linearly from the edge of the opening 53 into the interior of the opening 53. The length direction of the cantilever portion 54 coincides with the transport direction of the object to be examined by the radiation scanning device. The bottom of the opening 53 is used as a position limiting portion. When attaching the detector group 50, the opening 53 of the fixed block 52 of the detector arm 51 is aligned with the extending portion 55, and the detector arm 51 is moved linearly along the extending portion 55 until the bottom of the opening 53 abuts against the extending portion 55. Thereby, the detector group 50 is restricted to a predetermined mounting position.

[0053] The fixing device is provided on one side along the width direction of the detector arm 51 (the same side as the fixed block 52). The end face of the fixing device is formed as a mounting reference surface, and the fixing device clamps the detector arm 51 with respect to the mounting reference surface. Specifically, the fixing device may include a fixture 56 and a fastener 57. The end face of the fixture 56 away from the support frame is formed as a mounting reference surface 58 for abutting against one surface 59 on one side along the width direction of the detector arm 51. The surface 59 is the mounting surface of the detector arm 51 and is processed to have good flatness together with the mounting reference surface 58. Thereby, when the mounting surface 59 of the detector arm 51 abuts against and is fixed to the mounting reference surface 58, the detector group 50 can be accurately positioned in the transport direction of the object to be examined. The fastener 57 is for clamping the detector arm 51 with respect to the end face 58 of the fixture 56. The fastener 57 may be a fixing bolt. Corresponding screw holes are formed on the side of the detector arm 51 facing the fixture 56 and on the fixture 56 in the width direction of the detector arm 51. The fixing bolt may pass through the corresponding screw holes in the fixture 56 and the detector arm 51 and be tightened to fix the detector group 50 with respect to the mounting reference surface 58. Also, it may include a plurality, for example, at least two fixing devices. The plurality of fixing devices may be arranged at intervals along the length direction of the detector group 50 so as to firmly fix and position the detector group 50.

[0054] When attaching the detector group 50 using the above-described attachment and fixing structure, with the detector unit facing the scanning region and the width direction thereof coinciding with the transport direction of the object to be inspected, first, the opening 53 of the fixing block 52 in the detector group 50 is aligned with the extending portion 55 of the cantilever portion 54, and the detector group 50 is moved along the extending portion 55 until the bottom of the opening 53 abuts against the extending portion 55. Thereafter, a fastener 57 is passed through corresponding screw holes in the fixture 56 and the detector arm 51 and tightened, whereby the detector group 50 is positioned with respect to the mounting reference surface 58 of the fixture 56. When removing the detector group 50, the reverse operation may be performed.

[0055] Accordingly, by using the above-described attachment and fixing structure, the cantilever portion 54 extends along the transport direction of the object to be inspected in the radiation scanning device, the width direction of the detector group 50 is parallel to the transport direction of the object to be inspected, and the opening 53 of the fixing block 52 faces the thickness direction side of the detector group 50. Therefore, by directing the detector crystal toward the scanning region and orienting the length direction of the detector arm in the Y direction, the detector group 50 can be attached or removed perpendicular to the transport direction of the object to be inspected. Further, the fixing device is provided on one side along the width direction of the detector group 50, i.e., on one side along the Z direction of the detector, and thus, by the attachment and fixing structure according to the above embodiment, the attachment, detachment, and maintenance of the detector group can be facilitated to facilitate the fixing or adjustment of the detector group.

[0056] Alternatively, in the above-described attachment and fixing structure, the second attachment portion is arranged to support the detector group 50 at a predetermined attachment position in a state of being fitted with the first attachment portion. That is, after the detector group 50 has moved to a predetermined attachment position with respect to the extending portion 55 of the cantilever portion 54, the entire detector group 50 can be supported by the fixing block 52 without requiring any other auxiliary structure or tool. Accordingly, when tightening the detector group 50, no extra tool is required, and the operator does not need to hold and operate the detector group 50, thereby improving the convenience of the operation.

[0057] Thus, with the mounting and fixing structures of the above embodiments, the detector group in the radiation scanning device of the present application can be removed from or attached to the support frame perpendicular to the transport direction of the object to be inspected, and can be fixed or adjusted on one side along the transport direction of the object to be inspected, so that the detachment and maintenance can be facilitated.

[0058] As described above, in the mounting and fixing structure of the above embodiment, the detector group is attached or removed perpendicular to the transport direction of the object to be inspected. However, such an operation may be inconvenient. As described above, the distance between the scanning stages should be as small as possible when the optical path and / or members do not interfere with each other in order to reduce the optical path distribution length of the radiation scanning device. Under such a premise, since the size of the radiation source module is larger than that of the detector (especially in the Z direction), and the radiation source module is located outside in the direction perpendicular to the transport direction of the object to be inspected with respect to the detector on the same side of another scanning stage, attaching or removing the detector group perpendicular to the vertical direction of the object to be inspected may be hindered by the radiation source module of the adjacent scanning stage (as shown in FIG. 1A, the radiation source module of the first scanning stage A may hinder the removal or attachment of the detector group of the second scanning stage B). In this case, the detector group of the second scanning stage B, for example, the detector group located on the left side of the scanning area of the radiation source module close to the first scanning stage A, may be installed to be attached or removed with respect to the attachment position along the transport direction of the object to be inspected, for example, the support frame. Thus, it is not necessary to remove the radiation source module, and the detector group can be detached, fixed, or adjusted, improving the operational convenience. Accordingly, different mounting and fixing structures are required for such a detachment method. Hereinafter, specific embodiments of such a mounting and fixing structure will be described in detail.

[0059] Similar to the mounting and fixing structure of the above embodiment, a mounting and fixing structure applicable to removing or mounting a detector group along the transport direction of the object to be inspected also specifically includes a first mounting portion fixedly installed on the detector group, a second mounting portion fixedly provided on the support frame of the radiation scanning device and linearly movably fitted with the first mounting portion, and the detector group is movable to a predetermined mounting position along the second mounting portion in a state where the first mounting portion and the second mounting portion are fitted to each other, and a fixing device installed on one side along the width direction of the detector group for fixing the detector group with respect to the mounting reference surface on the support frame. In some specific embodiments, the detector group is mounted and fixed to the support frame of the radiation scanning device via a detector arm. Here, the first mounting portion is fixedly provided on the detector arm, and the fixing device is provided on one side along the width direction of the detector arm to fix the detector arm to the support frame and thus fix the detector group.

[0060] FIGS. 9A-9B show the mounting and fixing structure of a detector group according to some specific embodiments. FIG. 9A shows an exploded perspective view of the detector arm and the mounting and fixing structure, and FIG. 9B is a partial cross-sectional view of the detector arm in a state where the detector group is mounted and fixed. FIGS. 9A and 9B do not show a complete detector group but only show the detector arm, and a plurality of detector units may be arranged side by side in the length direction on the shown detector arm to form a complete detector group.

[0061] As shown in FIGS. 9A and 9B, the first mounting portion of the mounting and fixing structure of the detector group 60 is specifically formed in a slide groove 62 extending in the width direction of the detector arm 61. Here, in a state of being attached to the support frame of the radiation scanning device, the width direction of the detector arm 61 coincides with the transport direction of the object to be inspected, and the length direction is perpendicular to the transport direction of the object to be inspected. The second mounting portion is formed on a slide bar 63 that fits into the slide groove 62. The slide groove 62 is formed as a semi-circular open slide groove, and the slide bar 63 is formed as a cylindrical slide bar. The slide bar 63 is fixed to the support frame or integrally formed with the support frame, and its length direction coincides with the transport direction of the object to be inspected. One end of the slide bar 63 close to the support frame side is provided with a larger size than the other parts of the slide bar 63 in order to form a convex portion 64. The end face of the convex portion 64 facing the detector arm 61 side is formed on a mounting reference surface 65 that abuts against one surface 66 along the width direction of the detector arm 61. The surface 66 is the mounting surface of the detector arm 61, and is processed to have good flatness together with the mounting reference surface 65. When the mounting surface 66 of the detector group abuts against the mounting reference surface 65 and is positioned, the detector group 60 can be accurately positioned in the width direction, that is, the transport direction of the object to be inspected. The convex portion 64 is used as a position limiting portion. When mounting the detector group 60, the slide groove 62 is aligned with the slide bar 63, and the detector arm 61 is pushed toward the support frame along the slide bar 63 until the detector arm 61 abuts against the convex portion 64. Thereby, the detector arm 60 can be moved to a predetermined mounting position.

[0062] The fixing device is provided at the other end of the slide bar 63 opposite to the convex portion 64, and is provided so as to abut on both sides along the width direction of the convex portion 64 and the detector arm 61, thereby restricting the position of the detector arm 61 in the width direction. Specifically, the fixing device includes a positioning sleeve 67 that is fitted to the other end of the slide bar 63 facing the convex portion 64 and abuts on the other surface 69 along the width direction of the detector arm 61, and a fastener 68 for fixing the positioning sleeve 67 to the other end of the slide bar 63 facing the convex portion 64. Specifically, the fastener 68 may be a fastening screw, and screw holes are provided in both the positioning sleeve 67 and the other end of the slide bar 63. By screwing the fastening screw into the screw hole, the positioning sleeve 67 is tightened against the slide bar 63, and the detector arm 61 is fixed in the width direction with respect to the slide bar 63 (i.e., the support frame). At the same time, since the shapes of the slide bar 63 and the slide groove 62 are fitted to limit the degree of freedom of the detector arm 61, the detector arm 61 can be completely positioned and fixed.

[0063] When attaching the detector group 60 according to the above attachment and fixing structure, with the detector unit facing the scanning area and its width direction aligned with the transport direction of the object to be inspected, first align the slide groove 62 of the detector arm 61 with the slide bar 63, and move the detector arm 61 along the slide bar 63 until it abuts on the convex portion 64. Then, fit the positioning cover 67 onto one end of the slide bar 63 facing the convex portion 64 and fix it to the slide bar 63 with screws, thereby fixing the detector arm 61. When removing the detector group 60, the reverse operation may be performed.

[0064] According to such an attachment and fixing structure, the slide bar 63 extends along the transport direction of the object to be inspected. That is, the linear movement fitting between the detector group and the support frame is along the transport direction of the object to be inspected, and the fixing device is provided on one side along the width direction of the detector group. Therefore, the width direction of the detector group coincides with the transport direction of the object to be inspected. Accordingly, with the above attachment and fixing structure, the detector group can move along the transport direction of the object to be inspected for attachment or removal, and can be fixed or adjusted on one side along the transport direction of the object to be inspected. Therefore, the detector group can be detached or maintained from the side along the transport direction of the object to be inspected. Even when the detector is obstructed by the radiation source of another scanning stage along the outside perpendicular to the transport direction, the detachment or maintenance can be performed without being obstructed by the radiation source and without the need to remove the radiation source. Thereby, the convenience of the detachment and maintenance of the detector is improved.

[0065] Also, optionally, the second attachment part of the above attachment and fixing structure is arranged to support the detector group 60 at a predetermined attachment position in a state of being fitted with the first attachment part. Specifically, the second attachment part includes two slide bars 63, and two slide grooves 62 are correspondingly formed on the detector arm 61, which are provided at both ends along the length direction of the detector arm 61. After the detector arm 61 moves to a predetermined attachment position on the two slide bars 63, the two slide bars 63 can support the detector group at a predetermined attachment position without the need for other auxiliary structures and / or tools. In this way, when tightening the detector group, no extra tools are required, and the operator can operate without the need to hold the detector group. Therefore, the convenience of the operation is improved.

[0066] In FIGS. 9A and 9B, the detector arm is shown as the vertical direction, but the above attachment and fixing structure is not limited to being used only for the attachment and removal of the detector group arranged vertically in the radiation scanning device. The detector group arranged in other directions may also use the above attachment and fixing structure.

[0067] Of course, the mounting and fixing structure between the detector group 60 and the support frame is not limited to the embodiment shown in FIGS. 9A-9B, and other appropriate mounting and fixing structures may be adopted. For example, according to some embodiments, the linear movement fitting of the mounting and fixing structure may be other appropriate fittings, such as a linear rolling fitting such as the fitting between a linear ball bearing and a cylindrical shaft. According to some other embodiments, the cross-section of the slide groove 62 is not limited to a semi-circular shape, and may be a shape such as a semi-rectangle. Accordingly, the slide bar 63 is not limited to a cylindrical body, and may be a shape such as a prism that fits with the slide groove 62.

[0068] Thereby, since the detector group of the radiation scanning apparatus according to the present application can be detached or maintained along the transport direction of the object to be inspected, the detachment and maintenance are facilitated.

[0069] However, the embodiments of the present application are not limited to being detached or attached only along the transport direction of the object to be inspected or only along the direction perpendicular to the transport direction of the object to be inspected. Some of the detector groups may be detached or attached along the transport direction of the object to be inspected, and some other detector groups may be detached or attached along the direction perpendicular to the transport direction of the object to be inspected. Specifically, which method to adopt is determined according to the specific arrangement of the radiation scanning apparatus, as long as the detachment and maintenance are convenient.

[0070] In addition, the detector groups located in different directions of the scanning region of each scanning stage can be detached or attached to the support frame by adopting different mounting and fixing structures. However, due to the mounting reference surfaces of different detector groups, each detector group on the same scanning stage can be ensured to be located at a predetermined position along the transport direction of the object to be inspected and located in the same plane perpendicular to the Z direction or in different planes perpendicular to the Z direction offset by a predetermined distance after being mounted. Accordingly, the mounting reference surfaces of each detector group on the same scanning stage may be installed in the same plane perpendicular to the Z direction or in different planes perpendicular to the Z direction offset by a predetermined distance.

[0071] In addition, the attachment and fixation structure of each of the above embodiments is not limited to the detector group used in the radiation scanning apparatus of the present application, and may be used in the detector group of other suitable radiation scanning apparatuses.

[0072] As described above, the radiation scanning apparatus according to the embodiment of the present application further includes a control device arranged to control the beam emission order of the radiation source modules at each scanning stage. Optionally, the control device may be arranged such that the radiation source modules at each scanning stage each have one source point and emit beams simultaneously. For example, the radiation source module of the first scanning stage A includes targets A1, A2, A3, … An, the radiation source module of the second scanning stage B includes targets B1, B2, B3, … Bn, and the radiation source module of the third scanning stage C includes targets C1, C2, C3, … Cn. The control device can control the target points of the radiation source modules of the scanning stages A, B, and C to emit beams simultaneously in the order of A1B1C1 → A2B2C2 → A3B3C3 → … AnBnCn. The control device is not limited to controlling the target spots of a plurality of radiation source modules to emit beams simultaneously in the above order, that is, the order of the target spots in each radiation source module is not limited to the order from target spot 1 to target spot n, and conversely, it may be spaced, in reverse order, or random, as long as all the target spots in the radiation source module can be traversed.

[0073] According to the above embodiment, the radiation source modules at each scanning stage emit beams simultaneously, and the scanning speed of the radiation scanning apparatus can be accelerated. As a result, when the radiation scanning apparatus is applied to a luggage transportation system or the like, the scanning speed can be matched with the high luggage transmission speed of the luggage transportation system, avoiding the loading of luggage by security inspection, which is advantageous for improving the luggage transportation speed. Optionally, the transmission device of the radiation scanning apparatus may be installed to have the same speed as the transmission belt of the luggage transportation system.

[0074] In addition, when the radiation source modules on each scanning stage circulate to emit beams, by having the radiation source modules on each scanning stage emit beams simultaneously, in addition to improving the scanning speed, the radiation dose can be reduced (for example, when the voltage does not change, the current may be one-third of the magnitude of the circulating beam emission), thereby reducing the requirements for radiation shielding of the radiation scanning device, which is advantageous for reducing the device cost.

[0075] According to some embodiments, the radiation beams of the radiation source modules on each scanning stage have different energies. The radiation source modules are selectively arranged to emit radiation beams with different energies for different sizes in each direction of the object to be inspected. For example, when the object to be inspected is airport luggage, usually, the size in the thickness direction (i.e., the up-down direction of the radiation scanning device, the Y direction in FIG. 1A) is small, and the size in the width direction (i.e., the left-right direction of the radiation scanning device, the X direction in FIG. 1A) is large. Therefore, in order to obtain a high transmittance in the width direction, the radiation source modules arranged on the left or right side of the scanning area (for example, the radiation source modules of the first scanning stage A and the third scanning stage C) emit radiation beams with high energy to ensure the radiation transmittance in the width direction, increase the effective data detected by the detector, and thereby improve the image quality; correspondingly, the radiation source module arranged below the scanning area (for example, the radiation source module of the second scanning stage B) emits a radiation beam with lower energy than the radiation source modules on the left or right side of the scanning area, and can reduce the radiation dose while ensuring the radiation transmittance.

[0076] As described above, each specific embodiment of the radiation scanning device according to the present application has been described.

[0077] The embodiments of the present application further provide a radiation scanning system for luggage inspection, including the radiation scanning device and the luggage transportation system described in any of the above embodiments. The luggage transportation system is for transporting a plurality of pieces of luggage at locations such as airports, and includes a transmission belt for carrying and moving the luggage. The radiation scanning device scans a plurality of pieces of luggage in the luggage transportation system to inspect prohibited items and the like in the luggage. The radiation scanning device may be arranged at the opening, middle part or end of the luggage transportation system, and the transmission device of the radiation scanning device is arranged adjacent to the transmission of the luggage transportation system so that the luggage can move between them. The radiation scanning device has a radiation source module arranged below the transmission device, and by making the transmission device have a high height from the ground or the like, the luggage performs transportation to is selectively the same as the height of the transmission belt of the luggage transportation system according to the height of the transmission belt. Further, the radiation scanning device includes a control device, and the control device is arranged such that the radiation source modules at each scanning stage simultaneously emit beams at one target point to scan the luggage, and the radiation scanning device can detect an object to be detected such as luggage at a detection speed matching the transportation speed of the luggage transportation system. Optionally, the speed of the transmission device of the radiation scanning device is the same as the speed of the transmission belt of the luggage transportation speed. Thereby, the radiation scanning system according to the present application can conveniently transport luggage between the luggage transportation system and the radiation scanning device, and can safely inspect the luggage at a high speed.

[0078] The embodiments of the present application further provide a mounting positioning structure and a radiation scanning device used for a radiation source limited by each of the following items.

[0079] 1. A mounting positioning structure for a radiation source used in a radiation scanning device, The radiation scanning device includes a radiation source and a support frame to be fixedly installed. The mounting positioning structure includes a main body, and the main body is fixedly connected to the radiation source and the support frame so as to fixedly attach the radiation source to the support frame by the main body. The mounting positioning structure is A mobile device, wherein the radiation source is moved to a predetermined mounting position in a first plane by the mobile device, A first positioning device used to position the radiation source in the first plane, A lifting device used to adjust the position of the radiation source along a first direction perpendicular to the first plane, A second positioning device used to fix the position of the radiation source in the first direction, and comprising: A mounting positioning structure.

[0080] 2. The mounting positioning structure according to item 1, wherein the mobile device includes rollers provided at both ends along the length direction of the radiation source.

[0081] 3. The mounting positioning structure according to item 1, wherein the first positioning device includes a first positioning pin and a first pin hole provided on the main body and the support frame corresponding to the first positioning pin.

[0082] 4. The mounting positioning structure according to item 1, wherein the lifting device is provided at both ends along the length direction of the radiation source, one lifting device is formed by a roller capable of lifting, and the other lifting device is formed by a jacking screw.

[0083] 5. The mounting positioning structure according to item 4, wherein the second positioning device is formed by a positioning block disposed below the main body after the radiation source is adjusted to a predetermined position along the first direction by the lifting device.

[0084] 6. The mounting positioning structure according to any one of items 1-5, further comprising an adjusting device for rotating the radiation source along a predetermined axis to adjust the beam emission angle of the radiation source.

[0085] 7. A mounting shaft is provided on the radiation source, a corresponding shaft hole is provided on the main body, and the main body is mounted on the mounting shaft of the radiation source through the shaft hole. The positioning and mounting structure further includes a positioning member and a fastener. The main body is positioned relative to the radiation source by the fitting of the positioning member, the shaft hole, and the mounting shaft, and is fixedly connected to the radiation source by the fastener. The adjustment device includes a rotary drive device. When the positioning member and the fastener are released, the rotary drive device can drive the radiation source to rotate around the mounting shaft. The mounting and positioning structure according to item 6.

[0086] 8. The rotary drive device includes an adjustment block fixed to the radiation source and a jacking screw provided on the main body and abutted against the adjustment block. The jacking screw can be rotated to move the adjustment block and rotate the radiation source. The mounting and positioning structure according to item 7.

[0087] 9. The positioning member includes a second positioning pin and corresponding second pin holes formed in the main body and the radiation source, and the fastener includes a fixing bolt and corresponding screw holes formed in the main body and the radiation source. The mounting and positioning structure according to item 7.

[0088] 10. A radiation scanning device including a radiation source and a fixed support frame, wherein the radiation source is fixedly mounted to the support frame via the mounting and positioning structure according to any one of items 1-9.

[0089] 11. The radiation scanning device according to item 10, wherein the radiation source is rotated by the mounting and positioning structure to adjust the beam emission angle of the radiation source.

[0090] The embodiments of the present application further provide a detector mounting and fixing structure and a radiation scanning device limited to the following items.

[0091] 1. A detector mounting and fixing structure used in a radiation scanning device, The radiation scanning device includes the detector and a support frame to be fixedly installed. The detector includes at least two detector groups, and the detector groups are fixedly attached to the support frame via the attachment and fixing structure or removed from the support frame. The attachment and fixing structure includes a first attachment part fixedly installed on the detector group, and a second attachment part which is fixedly installed on the support frame and can be linearly movably fitted with the first attachment part. With the first attachment part and the second attachment part fitted to each other, the detector group can move along the second attachment part to a predetermined attachment position. The attachment and fixing structure further includes a fixing device provided on one side along the width direction of the detector group and used to fix the detector group with respect to the attachment reference surface on the support frame. Attachment and fixing structure.

[0092] 2. The attachment and fixing structure according to item 1, wherein the second attachment part is arranged to support the detector group at a predetermined attachment position in a state where it is fitted with the first attachment part.

[0093] 3. The attachment and fixing structure according to item 1 or 2, wherein the first attachment part includes a slider extending along the length direction of the detector group, and the second attachment part includes a fixed guide rail fitted with the slider.

[0094] 4. The attachment and fixing structure according to item 3, wherein the fixing device includes a fastener and a positioning member arranged on the support frame. The end surface of the positioning member away from the support frame is formed as the attachment reference surface for abutting against the surface on the one side along the width direction of the detector group, and the fastener penetrates through the positioning member and clamps the detector group against the end surface of the positioning member.

[0095] 5. The slider is provided on both sides facing each other in the width direction of the detector group and has inner extending parts extending inward from the edges on both sides facing each other in the width direction of the detector group. The fixed guide rail has outer extending portions that extend outward on both sides facing each other in the width direction. With the first mounting portion and the second mounting portion fitted together, the inner extending portion of the slider is positioned above the outer extending portion of the fixed guide rail so that the detector group can be suspended from the fixed guide rail, and the two are in contact with each other and overlapped. The mounting and fixing structure according to item 3.

[0096] 6. The first mounting portion is formed in a slide groove extending in the width direction of the detector group, and the second mounting portion is formed on a slide bar that fits into the slide groove. The mounting and fixing structure according to item 1 or 2.

[0097] 7. A convex portion is formed at one end of the slide bar close to the support frame, and the surface of the convex portion facing the detector group is formed as the mounting reference surface for abutting against the other surface along the width direction of the detector group. The mounting and fixing structure according to item 6.

[0098] 8. The fixing device is provided at the other end of the slide bar opposite to the convex portion, and is arranged to abut against both sides in the width direction of the convex portion and the detector group respectively. The mounting and fixing structure according to item 7.

[0099] 9. The fixing device includes a positioning sleeve that is fitted onto the other end of the slide bar and abuts against one side along the width direction of the detector, and a fastener for fixing the positioning sleeve to the other end of the slide bar. The mounting and fixing structure according to item 8.

[0100] 10. The second mounting portion includes two slide bars, and the first mounting portion includes two slide grooves formed at both ends along the length direction of the detector group. The two slide bars and the two slide grooves are respectively fitted to each other to position the detector group at the predetermined mounting position. The mounting and fixing structure according to item 6.

[0101] 11. The first mounting portion is formed on a fixed block that is fixed to one side along the width direction of the detector group and has an opening facing one side in the thickness direction of the detector group. The second mounting portion is formed on a cantilever portion fixed to the support frame, and an extending portion capable of linearly moving and fitting with the opening of the fixed block is provided at an end of the cantilever portion away from the support frame. The mounting and fixing structure according to item 1 or 2.

[0102] 12. The fixing device includes a fixture and a fastener provided on the support frame. An end face of the fixture away from the support frame is formed on the mounting reference surface for abutting against one side surface along the width direction of the detector group, and the fastener fastens the detector group to the end face of the fixture. The mounting and fixing structure according to item 11.

[0103] 13. The cantilever portion supports the detector group at the predetermined mounting position via the fixed block in a state where the first mounting portion and the second mounting portion are fitted together. The mounting and fixing structure according to item 11.

[0104] 14. A radiation scanning device including a detector and a fixedly provided support frame, the detector including at least two of the detector groups, and the detector groups being mounted and fixed to the support frame or removed from the support frame by the mounting and fixing structure according to any one of items 1-13.

[0105] 15. The width direction of the detector group is parallel to the transport direction of the object to be inspected, the length direction and the thickness direction of the detector group are perpendicular to the transport direction of the object to be inspected, and the transport direction of the object to be inspected is the direction in which the object to be inspected is transported and passes through the scanning area of the radiation scanning device. The radiation scanning device according to item 14.

[0106] 16. The mounting reference surface for each detector group is located in a plane perpendicular to the transport direction of the object to be inspected. The radiation scanning device according to item 15.

[0107] 17. The direction in which the first attachment portion moves linearly with respect to the second attachment portion is parallel or perpendicular to the transport direction of the object to be inspected. The radiation scanning apparatus according to item 14 or 15.

[0108] The above descriptions of the present application are all for the purpose of explanation and illustration, and are not intended to limit the present application in an exhaustive or exact form. Many modifications or changes are possible without departing from the principles of the invention of the present application. The described embodiments are for the purpose of best interpreting the principles of the present application and its practical applications. From the above description, those skilled in the art can better utilize and practice various embodiments and various variations of the present application. The scope of the present application is limited by the claims.

Claims

Claim 1 A radiation scanning device for a luggage transportation system, comprising: a transmission device configured to convey an object to be inspected so as to pass through a scanning area of the radiation scanning device; a plurality of scanning stages respectively disposed on a plurality of scanning planes in a transportation direction of the object to be inspected; each scanning stage includes a radiation source module and a detector group disposed opposite to each other, and the radiation source module includes a plurality of source points that emit radiation beams; the radiation source modules of the plurality of scanning stages are respectively disposed below, to the left, and to the right of the scanning area; the radiation source module of each scanning stage has an individual vacuum cavity for accommodating its plurality of source points, the radiation scanning device. Claim 2 When viewed along the transportation direction of the object to be inspected, the radiation source modules of the plurality of scanning stages are disposed in a semi-closed structure that encircles the scanning area and opens upward; The radiation scanning device according to claim 1. Claim 3 The radiation source module is a distributed radiation source, and the distributed radiation source is formed in a linear, polyline, or arc shape; The radiation scanning device according to claim 2. Claim 4 In each scanning stage, the detector is disposed so as to rotate around the scanning area in at least two directions; The radiation scanning device according to any one of claims 1 to 3. Claim 5 In the scanning stage where the radiation source module is disposed below the scanning area, the detector has a U-shaped structure that encircles the scanning area and opens downward; The radiation scanning device according to claim 4. Claim 6 In the scanning stage where the radiation source module is disposed to the left or right of the scanning area, the detector has an L-shaped structure or a U-shaped structure that encircles the scanning area; The radiation scanning device according to claim 4. Claim 7 The luggage transportation system includes a conveyor belt, and the speed and height of the transmission device are installed to match the speed and height of the conveyor belt of the luggage transportation system; The radiation scanning device according to any one of claims 1 to 3. Claim 8 The speed and height of the transmission device are installed to be the same as the speed and height of the conveyor belt of the luggage transportation system; The radiation scanning device according to claim 7. Claim 9 A control device is further included, which controls the beam emission order of the radiation source modules in each scanning stage so that one source point is simultaneously emitted from each radiation source module in each scanning stage. The radiation scanning device according to any one of claims 1 to 3.

10. The energies of the radiation beams of the radiation source modules of each scanning stage are the same. The radiation scanning device according to claim 9.

11. The energy of the radiation beam of the radiation source module arranged on the left or right of the scanning area is higher than the energy of the radiation beam of the radiation source module arranged below the scanning area. The radiation scanning device according to claim 9.

12. A radiation scanning system for luggage inspection, including the radiation scanning device according to claim 1 and a luggage transportation system, wherein the luggage transportation system includes a transmission belt for transporting luggage, and the transmission device of the radiation scanning device matches the height and speed of the transmission belt. Radiation scanning system.

13. The radiation scanning system according to claim 12, wherein the height and speed of the transmission device of the radiation scanning device and the transmission belt of the luggage transportation system are the same.

14. A mounting positioning structure for a radiation source used in the radiation scanning device according to claim 1, wherein the radiation scanning device includes a radiation source and a support frame to be fixedly installed. The mounting positioning structure includes a main body, and the main body is fixedly connected to the radiation source and the support frame so as to fixedly attach the radiation source to the support frame by the main body. The mounting positioning structure is a moving device for moving the radiation source to a predetermined mounting position in a first plane by the moving device, a first positioning device used for positioning the radiation source in the first plane, a lifting device used for adjusting the position of the radiation source along a first direction perpendicular to the first plane, and a second positioning device used for fixing the position of the radiation source in the first direction. Mounting positioning structure.

15. A mounting and fixing structure for a detector used in the radiation scanning device according to claim 1, The radiation scanning device includes the detector and a fixed support frame. The detector includes at least two detector groups. The detector groups are fixedly attached to the support frame via the mounting and fixing structure or removed from the support frame. The mounting and fixing structure is a first mounting portion fixed to the detector group, a second mounting portion that is fixed to the support frame and can linearly move and fit with the first mounting portion. In a state where the first mounting portion and the second mounting portion are fitted to each other, the detector group can move to a predetermined mounting position along the second mounting portion. a fixing device provided on one side along the width direction of the detector group and used to fix the detector group to the mounting reference surface on the support frame. Mounting and fixing structure.

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