Linear scanning CT imaging system and imaging method

Abstract

Embodiments of this application provide a linear scanning CT imaging system and imaging method. The linear scanning CT imaging system includes: a support frame; a transport device mounted on the support frame, the transport device including a drive mechanism, a transmission mechanism, and a circular transport path, the drive mechanism being configured to drive the transmission mechanism to move along the circular transport path, and multiple local linear paths in the circular transport path forming multiple linear scanning segments; at least one carrier mounted on the transmission mechanism, configured to carry at least one scanned object, the carrier being able to follow the transmission mechanism to move along the circular transport path to pass through multiple linear scanning segments; multiple scanning devices, respectively disposed in the multiple linear scanning segments, with multiple X-ray sources in the multiple linear scanning segments emitting multiple X-ray beams from multiple angles relative to the scanned object; and an imaging device for generating a computed tomographic image of the scanned object based on multiple projection data detected by various detectors in the multiple linear scanning segments.

Description

Technical Field

[0001] This application relates to the fields of scanning imaging and battery detection, and specifically to a linear scanning CT imaging system and imaging method. Background Technology

[0002] Scanning imaging relies on X-ray sources and detectors to sample the object point-by-point and line-by-line to obtain information on the electromagnetic radiation characteristics of the object, forming an image within a specific spectral band. Existing rotational CT (Computed Tomography) technology requires improvement. Summary of the Invention

[0003] In view of the above problems, this application provides a linear scanning CT imaging system and imaging method.

[0004] According to a first aspect of this application, a linear scanning CT imaging system is provided, comprising: a support frame; a transport device mounted on the support frame, the transport device including a drive mechanism, a transmission mechanism, and an annular transport path, the drive mechanism being configured to drive the transmission mechanism to move along the annular transport path, wherein multiple local linear paths in the annular transport path form multiple linear scanning segments; at least one carrier mounted on the transmission mechanism, configured to carry at least one scanned object, the carrier being capable of following the transmission mechanism to move along the annular transport path to pass through the multiple linear scanning segments; multiple sets of scanning devices, respectively disposed in the multiple linear scanning segments, each set of scanning devices including at least one X-ray source and at least one detector, the X-ray source being configured to emit X-ray beams to form a scanning area, the detector being configured to detect projection data formed after the X-ray beams pass through the scanned object as the scanned object passes through the scanning area, wherein the multiple X-ray sources in the multiple linear scanning segments emit multiple X-ray beams relative to the scanned object from multiple angles; and an imaging device for generating a computed tomographic image of the scanned object based on the multiple projection data detected by each detector in the multiple linear scanning segments.

[0005] According to an embodiment of this application, the system further includes: an annular guide path installed on a first side of the support frame; at least one guide member installed on the annular guide path, the at least one guide member being connected to at least one bearing seat; wherein the annular conveying path is installed on a second side of the support frame, the second side being opposite to the first side.

[0006] According to an embodiment of this application, the annular guide path is close to the annular contour edge of the first side of the support frame, and the annular conveying path is close to the annular contour edge of the second side of the support frame.

[0007] According to an embodiment of this application, the carrier includes: a carrier portion configured to define a carrier surface to carry a scanned object; a first connecting portion having a first end connected to the carrier portion and extending from the first end to a second end in a direction away from the carrier surface, the second end of the first connecting portion being configured to be connected to a transmission mechanism; and a second connecting portion opposite to the first connecting portion, having a first end connected to the carrier portion and extending from the first end to the second end in a direction away from the carrier surface, the second end of the second connecting portion being configured to be connected to a guide member.

[0008] According to an embodiment of this application, the support frame includes: an annular end face, the two sides of which are respectively connected to a first side face and a second side face; wherein, the bearing portion is configured to face the annular end face, and when the bearing seat passes through multiple linear scanning segments, the bearing surface has multiple included angles relative to the annular end face.

[0009] According to an embodiment of this application, the bearing portion includes a bearing plate defining a bearing surface; the first connecting portion includes a first extension and a first upright plate connected to a transmission mechanism, the first extension is connected to the bearing plate and extends in a direction away from the bearing plate, the first upright plate is connected to the first extension and is perpendicular to the bearing surface; the second connecting portion includes a second extension and a second upright plate connected to a guide member, the second extension is connected to the bearing plate and extends in the same direction as the first extension, the second upright plate is connected to the second extension and is perpendicular to the bearing surface, and the second upright plate is disposed opposite to the first upright plate.

[0010] According to an embodiment of this application, a first vertical plate is provided with a first connecting hole, and a second vertical plate is provided with a second connecting hole. The center point of the first connecting hole and the center point of the second connecting hole are respectively located on a first plane and a second plane, and the first plane and the second plane are respectively parallel to the bearing surface; and / or, the movement trajectories of the center point of the first connecting hole and the center point of the second connecting hole are projected onto the same straight line of a third plane, and the third plane is perpendicular to the bearing surface.

[0011] According to an embodiment of this application, a plurality of straight line scanning segments include a first straight line scanning segment and a second straight line scanning segment, and a plurality of local guide paths in the annular guide path include a first guide path and a second guide path; wherein, the first straight line scanning segment corresponds to the first guide path, and their center lines are respectively located on a first plane and a second plane; the second straight line scanning segment corresponds to the second guide path, and their center lines are projected onto the same straight line of a third plane.

[0012] According to an embodiment of this application, when the scanned object passes through the first linear scanning segment, the X-ray beam emitted by the X-ray source in the first linear scanning segment is perpendicular to the bearing surface; when the scanned object passes through the second linear scanning segment, the X-ray beam emitted by the X-ray source in the second linear scanning segment is parallel to the bearing surface.

[0013] According to an embodiment of this application, when the scanned object passes through a first linear scanning segment, a first surface angle is formed between the detector surface and the bearing surface in the first linear scanning segment; when the scanned object passes through a second linear scanning segment, a second surface angle is formed between the detector surface and the bearing surface in the second linear scanning segment, and the first surface angle and the second surface angle are not equal.

[0014] According to an embodiment of this application, the first face angle is approximately 0° and the second face angle is approximately 90°.

[0015] According to an embodiment of this application, the first linear scanning segment and the second linear scanning segment are connected, forming an angle of approximately 90° between them.

[0016] According to an embodiment of this application, the posture of the scanned object when passing through the first straight line scan segment is the same as the posture when passing through the second straight line scan segment.

[0017] According to an embodiment of this application, when the scanned object passes through a first straight line scan segment, the orthographic projection area of ​​the scanned object intersects at least partially with the orthographic projection area of ​​the first straight line scan segment; when the scanned object passes through a second straight line scan segment, the orthographic projection area of ​​the scanned object and the orthographic projection area of ​​the second straight line scan segment are independent of each other.

[0018] According to an embodiment of this application, the transmission mechanism includes a slider configured to be rotatably connected to a first connecting hole to connect a first vertical plate to a first linear scanning segment or a second linear scanning segment; and / or, the guide includes a guide wheel configured such that one end away from the wheel is connected to a second connecting hole, and the other end where the wheel is located is connected to a first guide path or a second guide path.

[0019] According to an embodiment of this application, the transmission mechanism further includes: a connecting block, one side of which is provided with a protrusion for rotatably connecting with the first connecting hole, and the other side is fixedly connected to the slider.

[0020] According to an embodiment of this application, the carrier further includes: a tray disposed on the carrier surface, the tray being configured to carry the scanned object; and a plurality of constraint members disposed on the tray and configured to constrain the movement of the scanned object.

[0021] According to embodiments of this application, each scanning device includes: a first radiation source; a first detector, wherein, during the scanning process of the object being scanned passing through the scanning area of ​​the first radiation source, the first radiation source and the first detector are located on opposite sides of the object being scanned; a second radiation source, opposite to the first radiation source, wherein the radiation beam emitted by the second radiation source and the radiation beam emitted by the first radiation source pass through different areas of the object being scanned; and a second detector, opposite to the first detector, wherein, during the scanning process of the object being scanned passing through the scanning area of ​​the first radiation source, the second radiation source and the second detector are located on opposite sides of the object being scanned.

[0022] According to embodiments of this application, the scanning object includes flat-shaped battery cells.

[0023] A second aspect of this application provides a linear scanning CT imaging method applied to any of the above-mentioned systems, comprising: driving a drive mechanism to move a transmission mechanism along a circular transport path, wherein at least one carrier mounted on the transmission mechanism carries at least one scanning object, the carrier being able to follow the transmission mechanism to move along the circular transport path to pass through multiple linear scanning segments, the multiple local linear paths in the circular transport path forming multiple linear scanning segments; emitting a beam from a radiation source to form a scanning area, and detecting projection data formed after the radiation beam passes through the scanning object as it passes through the scanning area, wherein multiple scanning devices are respectively disposed in the multiple linear scanning segments, each scanning device including at least one radiation source and at least one detector; and generating a computed tomographic image of the scanning object by an imaging device based on the multiple projection data detected by each detector in the multiple linear scanning segments.

[0024] The above-described one or more embodiments have the following beneficial effects: The linear scanning CT imaging system forms multiple linear scanning segments by setting a circular transport path, and acquires projection data from multiple angles with multiple scanning devices. The imaging device integrates the data to generate CT images. The carrier moves the scanned object continuously through each linear scanning segment, and the multi-angle X-ray source realizes multi-dimensional scanning data acquisition. It can move cyclically along the circular path, which can improve the continuity of scanning and detection efficiency. Complete and high-precision CT images can be generated from multi-angle projection data, making it suitable for continuous online detection operations. Attached Figure Description

[0025] The above-mentioned contents, other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0026] Figure 1 This illustration schematically depicts an application scenario of a linear scanning CT imaging system and imaging method according to an embodiment of this application;

[0027] Figure 2 The schematic diagram illustrates a structural schematic of a linear scanning CT imaging system according to an embodiment of this application;

[0028] Figure 3 A schematic diagram of the structure of a second linear scanning CT imaging system according to an embodiment of this application is shown.

[0029] Figure 4 The schematic diagram illustrates a structural schematic of a support according to an embodiment of this application;

[0030] Figure 5This schematically illustrates a front view of a support according to an embodiment of the present application;

[0031] Figure 6 A schematic diagram of a connecting block structure according to an embodiment of this application is shown.

[0032] Figure 7 A schematic diagram of another bearing seat according to an embodiment of this application is shown;

[0033] Figure 8 A schematic diagram of a battery cell according to an embodiment of this application is shown. Detailed Implementation

[0034] The embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0035] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0036] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0037] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0038] Figure 1 The illustration shows a schematic diagram of an application scenario of a linear scanning CT imaging system and imaging method according to an embodiment of this application.

[0039] like Figure 1As shown, the scanning device of a linear scanning CT imaging system can be used for radiation emission and projection data acquisition. The radiation source 51 of the scanning device is a component capable of emitting a radiation beam, such as an X-ray accelerator, X-ray machine, or radioactive isotope, along with corresponding auxiliary equipment, forming a scanning area covering the object to be scanned 7. The detector 52 may include a detector array for acquiring transmission projection data of the radiation by receiving radiation that passes through the object to be imaged. The detector 52 may also include readout circuitry and a logic control unit for reading the projection data from the detector array. The detector array may include multiple solid-state detector units, multiple gas detector units, or multiple semiconductor detector units. For example, the detector 52 may be a flat panel detector or a linear array detector. The scanning area is the spatial region covered by the radiation beam emitted by the radiation source 51. When the object to be scanned 7 passes through this area, it can be scanned at least partially by the scanning device, forming projection data.

[0040] In the field of industrial inspection, it is often necessary to inspect the internal structure or defects of products. This involves large quantities of samples and a fast pace of inspection. For example, in the production of flat objects such as lithium-ion battery cells, online quality inspection of a batch of lithium-ion battery cells is required. This involves a huge number of cells, a fast production pace, and high accuracy requirements. Therefore, achieving stable transport and posture maintenance of the inspected object during the scanning process, as well as efficient integration and image fusion of multi-angle linear scans, is extremely crucial.

[0041] Linear CT inspection technology features a linear scanning path and greater applicability to inspect objects of varying sizes, utilizing linear scanning to achieve CT imaging of the output object. However, related linear CT inspection technologies are difficult to apply to inspection requirements involving large quantities, fast production line cycles, and high precision in localized areas. The transport accuracy and posture consistency of the inspected object during horizontal and vertical movement significantly impact imaging accuracy in linear CT inspection. Therefore, improving the inspection cycle time and imaging accuracy of linear CT inspection has become a key factor restricting its further application in high-precision online inspection scenarios for flat objects such as lithium battery cells.

[0042] Figure 2 The schematic diagram illustrates the structure of a linear scanning CT imaging system according to an embodiment of this application.

[0043] like Figure 2 As shown in the figure, a linear scanning CT imaging system according to an embodiment of this application includes: a support frame 1, a conveying device, at least one carrier 4, and multiple scanning devices 5.

[0044] The conveying device is installed on the support frame 1. The conveying device includes a drive mechanism, a transmission mechanism 2 and an annular conveying path 3. The drive mechanism is configured to drive the transmission mechanism 2 to move along the annular conveying path 3. Multiple local straight paths in the annular conveying path 3 form multiple straight scanning segments.

[0045] At least one carrier 4 is mounted on the transmission mechanism 2 and configured to carry at least one scanning object 7. The carrier 4 is capable of moving along the annular conveying path 3 with the transmission mechanism 2 to pass through multiple linear scanning segments.

[0046] Multiple scanning devices 5 are respectively set in multiple linear scanning segments. Each scanning device 5 includes at least one X-ray source 51 and at least one detector 52. The X-ray source is configured to emit X-ray beams to form a scanning area. The detector is configured to detect the projection data formed after the X-ray beam passes through the scanning object 7 as the scanning object 7 passes through the scanning area. The multiple X-ray sources in the multiple linear scanning segments emit multiple X-ray beams from multiple angles relative to the scanning object 7. An imaging device is used to generate a computed tomography image of the scanning object 7 based on the multiple projection data detected by each detector in the multiple linear scanning segments.

[0047] The support frame 1 can be a structural component that provides fixation and support for at least one of the following components: the conveying device, the carrier 4, the scanning device 5, and the imaging device. The support frame 1 can possess appropriate structural strength and stability to ensure the accuracy of the supported component's installation position. For example, the support frame 1 can be a frame-type support frame made of spliced ​​aluminum alloy profiles, or it can be an integrated support frame welded from steel plates. The support frame 1 can be equipped with a base 100, which can be used to place the linear scanning CT imaging system on the ground.

[0048] The conveying device drives the carrier 4 to move the scanning object 7 through the transmission mechanism 2. By allowing the carrier 4 to move continuously along the preset circular conveying path 3, the scanning object 7 is driven to complete the scanning through each straight scanning segment, thereby realizing continuous online detection.

[0049] The drive mechanism can be a power-providing component, such as a servo motor or stepper motor. The transmission mechanism 2 can be a component that transmits power and drives the carrier 4 to move. The transmission mechanism 2 can include, for example, a timing belt, chain, or slider. The conveying device can include multiple transmission mechanisms. For example, the conveying device can include 10 sliders that can continuously convey multiple scanned objects 7 for detection.

[0050] The annular transport path 3 corresponds to the movement trajectory of the transmission mechanism 2 and the support 4. It is a closed loop and can contain multiple local straight paths, i.e., multiple straight scanning segments. For example, the annular transport path 3 as a whole can be approximated as a rectangle, trapezoid, rounded rectangle, or other polygons. The annular transport path 3 can include horizontal straight scanning segments, vertical straight scanning segments, or oblique scanning segments with a certain angle to the horizontal direction. The horizontal straight path can be the horizontal part of the annular transport path 3, and the vertical straight path is the part of the annular transport path 3 perpendicular to the horizontal plane. The horizontal and vertical straight scanning segments can be connected by an arc path to form an annular scanning area. When using the straight-line scanning CT imaging system for imaging, the scanning object 7 can sequentially pass through the horizontal and vertical straight scanning segments to complete the horizontal and vertical scanning.

[0051] The carrier 4 is connected to the transmission mechanism 2 and can move along the annular conveying path 3 following the transmission mechanism 2. For example, the carrier 4 can move cyclically along the annular path. The carrier 4 can be used to place and fix the scanning object 7. The carrier 4 can be designed with a structure adapted to the shape and specifications of the scanning object 7. For example, the carrier 4 can be a tray-type carrier, a cage-type carrier, or other shapes.

[0052] Projection data is the X-ray signal data received by the detector after the X-ray beam passes through the scanned object. As the X-ray beam passes through the scanned object, it attenuates to varying degrees due to differences in density and thickness of different internal structures. The detector 52 converts the attenuated X-ray signal into an electrical or digital signal, thus forming projection data. Projection data can be used as the raw data for generating CT images.

[0053] An imaging device can generate computed tomographic images of the scanned object based on the projection data of a linear scan segment and through CT reconstruction. The imaging device can be, for example, a computer or a server.

[0054] Multiple X-ray sources emit multiple beams of X-rays from multiple angles relative to the object being scanned, enabling multi-dimensional scanning of the object. For example, the first linear scan segment emits a beam at a 30° angle (the angle between the beam and the object's surface), the second at a 90° angle, and the third at a 150° angle. Multiple X-ray sources can compensate for the limitations of single-angle scanning, generating CT images of the object, either locally or globally.

[0055] The scanning device 5 can be positioned in a linear scanning segment. For example, the scanning device 5 can be positioned in at least one linear scanning segment of a linear scanning CT imaging system. Exemplarily, a scanning device 5 can be configured in a horizontal scanning segment. The X-ray source of the scanning device 5 emits a vertically downward X-ray beam to form a scanning area. When the object being scanned passes through this area, the X-ray beam penetrates the sensor, and a detector on the other side receives the X-ray and records projection data. Based on the recorded projection data, a computed tomographic image of the object is generated, allowing for the examination of internal defects, structures, and other objects contained within the object.

[0056] The linear scanning CT imaging system of this application embodiment forms multiple linear scanning segments by setting up a circular transport path 3, and is equipped with multiple scanning devices 5 to acquire projection data from multiple angles. The imaging device integrates the data to generate CT images. The carrier 4 drives the scanned object to continuously pass through each linear scanning segment. The multi-angle X-ray source realizes multi-dimensional scanning data acquisition. It can move cyclically along the circular path, which can improve the continuity of scanning and detection efficiency. Complete and high-precision CT images can be generated from multi-angle projection data, which is suitable for continuous online detection operations.

[0057] Figure 3 The schematic diagram illustrates the structure of a linear scanning CT imaging system according to an embodiment of this application.

[0058] like Figure 3 As shown, according to an embodiment of this application, the linear scanning CT imaging system may further include: an annular guide path 6, installed on the first side 11 of the support frame 1; at least one guide member 41, installed on the annular guide path 6, the at least one guide member 41 being connected to at least one carrier 4; wherein, an annular conveying path 3 is installed on the second side 12 of the support frame 1, the second side 12 being opposite to the first side 11.

[0059] The support frame 1 includes opposing first side 11 and second side 12. An annular guide path 6 and an annular conveying path 3 can be respectively mounted on the first side 11 and second side 12 of the support frame 1. The annular guide path 6 can be a closed annular guide structure and matches the annular conveying path 3. For example, the annular guide path 6 corresponding to the annular conveying path 3 can have multiple local straight guide paths. These straight guide paths can be parallel to the local straight paths of the annular conveying path 3.

[0060] The circular guide path 6 can guide the movement of the support seat 4, allowing the support seat 4 to move along a preset trajectory, and can also be used to counteract the offset and shaking generated during the movement of the transmission mechanism 2.

[0061] The guide member 41 is mounted on the annular guide path 6. The guide member 41 and the support seat 4 can be rigidly connected. The guide member 41 can have a rolling structure, such as a sliding block, ball bearing, or roller. The annular guide path 6 can have a grooved guide rail. The rolling structure of the guide member 41 can move along the annular guide path 6 following the support seat 4, transmitting the constraint force of the guide path to the support seat 4 and restricting the support seat 4 from moving in a non-preset direction. For example, the roller of the guide member 41 cooperates with the groove of the annular guide path 6; when the support seat 4 moves, the guide wheel rolls along the guide rail, providing guiding constraints for the support seat 4.

[0062] In this embodiment, the annular guide path 6 and the annular conveying path 3 are respectively located on opposite sides of the support frame 1. The conveying device is responsible for power drive, and the guide mechanism is responsible for motion guidance. The annular guide path 6 and the annular conveying path 3 cooperate with each other, structurally forming a double constraint on the movement of the support seat 4, effectively reducing the offset and swaying of the support seat 4 during the annular movement process, improving the stability and accuracy of the movement of the support seat 4, improving the positional stability of the scanned object during the scanning process, and thus improving the imaging accuracy.

[0063] According to an embodiment of this application, the annular guide path 6 may be close to the annular contour edge of the first side 11 of the support frame 1, and the annular conveying path 3 may be close to the annular contour edge of the second side 12 of the support frame 1.

[0064] The annular contour edge is the edge region on the first side 11 and the second side 12 of the support frame 1. The annular guide path 6 and the annular conveying path 3 can be set near the annular contour edge of the corresponding side of the support frame 1. The annular guide path 6 can be installed at the edge of the first side 11 of the support frame 1, and the annular conveying path 3 can be installed at the edge of the second side 12 of the support frame 1. The support frame 1 can span the first side 11 and the second side 12, thereby effectively utilizing the annular guide path 6 on the first side 11 and the annular conveying path 3 on the second side 12. By controlling the movement of the support frame 1 with the help of the two sides, the positional stability and imaging accuracy of the scanned object during the scanning process can be improved.

[0065] Multiple scanning devices 5 can be easily installed on the edge of the ring-shaped contour, making it convenient to scan the object from different angles.

[0066] For example, the first side 11 of the support frame 1 is a rectangular frame surface, and its annular contour edge includes the four edges of the front frame. The annular guide rail (annular guide path 6) is installed along the front edge and fits the annular contour of the frame edge. The second side 12 of the support frame 1 is a rectangular frame surface opposite to the first side 11. Its annular contour edge is the four edges of the reverse frame. The annular guide rail pair (annular conveying path 3) is installed along the edge of the second side 12, and the annular contour of the annular guide rail pair of the second side 12 overlaps with the projection of the annular contour of the annular guide rail of the first side on the plane of the support frame 1.

[0067] For example, the first side 11 of the support frame 1 is equipped with an annular guide rail (annular guide path 6), and the second side 12 of the support frame 1 is equipped with an annular guide rail pair (annular conveying path 3). The annular profile of the second side annular guide rail pair does not overlap with a portion of the projection of the annular profile of the first side annular guide rail onto the plane of the support frame 1, for example, there is a height difference.

[0068] In this embodiment, the annular guide path 6 is located near the annular contour edge of the first side 11 of the support frame 1, and the annular conveying path 3 is located near the annular contour edge of the second side 12 of the support frame 1. This arrangement ensures that the layout of the annular guide path 6 and the annular conveying path 3 conforms to the structural contour of the support frame 1, effectively utilizing the space of the support frame 1. Simultaneously, it makes the movement trajectory of the bearing seat 4 more closely follow the preset annular path, further guaranteeing motion accuracy.

[0069] Figure 4 The schematic diagram shows a structural schematic of a support 4 according to an embodiment of the present application.

[0070] like Figure 4 As shown, according to an embodiment of this application, the carrier 4 may include: a carrier portion 42 configured to define a carrier surface 420 to carry the scanned object; a first connecting portion 43, the first end of which is connected to the carrier portion 42 and extends from the first end to the second end in a direction away from the carrier surface 420, the second end of which is configured to be connected to the transmission mechanism 2; and a second connecting portion 44 opposite to the first connecting portion 43, the first end of which is connected to the carrier portion 42 and extends from the first end to the second end in a direction away from the carrier surface 420, the second end of which is configured to be connected to the guide member 41.

[0071] The support surface 420 defined by the support portion 42 can be used to place and support the scanned object. The support portion 42 can also be used to support a tray for placing the scanned object, thereby indirectly supporting the scanned object. The support surface 420 of the support portion 42 can be designed with a structure that cooperates with the tray or the scanned object. For example, the support surface 420 can be designed as a flat plate, a groove, a slot, a protrusion, etc.

[0072] The first connecting part 43 can be used to connect the carrier part 42 and the transmission mechanism 2 on the side of the annular conveying path 3. The transmission mechanism 2 drives the carrier part 42 through the first connecting part 43. The second connecting part 44 can be used to connect the carrier part 42 and the guide member 41 on the side of the annular guide path 6.

[0073] The first connecting part 43 and the second connecting part 44 can be rectangular plates or L-shaped metal connecting plates. The shapes of the first connecting part 43 and the second connecting part 44 can be different; for example, the first connecting part 43 and the second connecting part 44 can be L-shaped metal connecting plates of different specifications.

[0074] The first connecting part 43 and the second connecting part 44 are located on both sides of the bearing part 42, which can make the bearing seat 4 be subjected to balanced force during movement.

[0075] In the embodiments of this application, the support portion 42, the first connecting portion 43, and the second connecting portion 44 of the support base 4 respectively fulfill the functions of supporting the scanned object, connecting with the transmission mechanism, and connecting with the guide member. Furthermore, the first connecting portion 43 and the second connecting portion 44 extend away from the support surface 420, so that the transmission and guiding forces are transmitted away from the support area of ​​the scanned object, preventing the forces from directly affecting the posture of the scanned object. The first connecting portion 43 and the second connecting portion 44 are located on opposite sides of the support portion 42, ensuring that the support base 4 is subjected to balanced forces, preventing tilting or deformation during movement, and ensuring that the scanned object always maintains a stable support posture.

[0076] like Figure 3 As shown, according to an embodiment of this application, the support frame 1 may include: an annular end face 13, the two sides of which are connected to the first side face 11 and the second side face 12 respectively; wherein, the bearing portion 42 is configured to face the annular end face 13, and when the bearing seat 4 passes through multiple linear scanning segments, the bearing surface has multiple included angles relative to the annular end face 13.

[0077] The support frame 1 can be plate-shaped, with the two sides of the annular end face 13 connected to the first side face 11 and the second side face 12 of the support frame 1, respectively. During the entire process of the support seat 4 moving along the annular path, since the support part 42 is arranged opposite to the annular end face 13, the included angle between the support surface and the annular end face 13 can change accordingly and in a preset manner when the support seat 4 passes through different straight scanning segments, rather than a single fixed included angle.

[0078] For example, when the spatial orientation of the support 4 remains unchanged and the support 4 moves along a vertical straight scanning segment, the support surface of the support 4 can form a 90° angle with the opposite annular end face 13. When the support 4 moves along a horizontal straight scanning segment, the plane of the support 4 can form a 0° angle with the opposite annular end face 13. When the support 4 moves along a straight scanning segment at a 30° angle to the horizontal plane, the plane of the support 4 can form a 30° angle with the opposite annular end face 13. By adjusting the angle of the straight scanning segment, the support 4 can perform multi-angle scanning. The multi-angle design between the support surface and the annular end face 13 allows the scanned object to face the X-ray source of different scanning segments at a preset angle, achieving multi-angle and multi-dimensional scanning without additional adjustment of the scanned object's orientation, thus simplifying the control of the scanning angle.

[0079] In the embodiments of this application, the annular end face 13 provides a suitable structural reference for the annular movement of the carrier 4. The multi-angle design between the carrier surface and the annular end face allows the scanning object to face the scanning device 5 at a suitable angle when the carrier 4 passes through different straight scanning segments, meeting the needs of multi-angle scanning. At the same time, the limiting effect of the annular end face 13 ensures that the movement of the carrier 4 always fits the reference surface, ensuring the accuracy of the scanning angle.

[0080] According to an embodiment of this application, the support portion 42 may include a support plate defining a support surface 420; the first connecting portion 43 includes a first extension 431 and a first upright plate 432 connected to the transmission mechanism 2, the first extension 431 is connected to the support plate and extends in a direction away from the support plate, the first upright plate 432 is connected to the first extension 431 and is perpendicular to the support surface 420; the second connecting portion 44 includes a second extension 441 and a second upright plate 442 connected to the guide member 41, the second extension 441 is connected to the support plate and extends in the same direction as the first extension 431, the second upright plate 442 is connected to the second extension 441 and is perpendicular to the support surface 420, and the second upright plate 442 is disposed opposite to the first upright plate 432.

[0081] The first extension 431 extends in a direction away from the support plate, which can keep the support plate away from the annular conveying path 3, the annular guide path 6 or the annular end face, thereby leaving space for the support part 42 to place the scanning object and preventing the support part 42 or the scanning object from interfering with the support frame 1, etc. during the movement.

[0082] The extension portion of this application provides a transitional connection between the support plate and the upright plate, leaving space for the support portion 42 to place the scanning object and preventing interference between the support portion 42 or the scanning object and the support frame 1 during movement. The design of the upright plate being perpendicular to the support surface 420 allows the force exerted on the support seat 4 by the transmission mechanism and guide members to be transmitted in a direction perpendicular to the support surface 420, which helps to maintain the stability of the support surface 420. At the same time, the relatively arranged upright plates ensure that the force on the support seat 4 is symmetrically distributed, improving the structural stability of the support seat 4 and ensuring the posture stability of the scanning object.

[0083] Figure 5 The diagram illustrates a front view of a support according to an embodiment of this application.

[0084] like Figure 5 As shown, according to an embodiment of this application, the first upright plate 432 may be provided with a first connecting hole 430, and the second upright plate 442 may be provided with a second connecting hole 440. The center point of the first connecting hole 430 and the center point of the second connecting hole 440 are respectively located on a first plane and a second plane, and the first plane and the second plane are respectively parallel to the bearing surface 420; and / or, the movement trajectories of the center point of the first connecting hole 430 and the center point of the second connecting hole 440 are projected onto the same straight line of a third plane, and the third plane is perpendicular to the bearing surface 420.

[0085] The first upright plate 432 is provided with a first connecting hole 430 for connecting the support base 4 and the transmission mechanism 2. The second upright plate 442 is provided with a second connecting hole 440 for connecting the support base 4 and the guide member 41. In some linear scanning segments, with the support surface 420 as a reference plane, the center point of the first connecting hole 430 is located on a first plane, and the center point of the second connecting hole 440 is located on a second plane. Both the first and second planes are parallel to the support surface 420. The first and second planes can be different planes.

[0086] Taking a horizontal linear scanning segment as an example, the center point of the first connecting hole 430 is located on the first plane, and the center point of the second connecting hole 440 is located on the second plane, and the first and second planes do not overlap. During the movement of the support 4, the center points of the first connecting hole 430 and the second connecting hole 440 remain at different heights. The support surface 420 is in a stable plane, thereby allowing the scanned object to maintain a fixed posture during movement (the support surface 420 remains upward).

[0087] In some linear scanning segments, the movement trajectories of the center point of the first connecting hole 430 and the center point of the second connecting hole 440 are both straight lines, and the movement trajectories are projected onto the same straight line of the third plane. The third plane can be a plane perpendicular to the bearing surface, or it can be a plane parallel to the first vertical plate 432 or the second vertical plate 442.

[0088] Taking a vertical linear scanning segment as an example, the movement trajectories of the center point of the first connecting hole 430 and the center point of the second connecting hole 440 are projected onto the same straight line of the third plane. The line connecting the center point of the first connecting hole 430 and the center point of the second connecting hole 440 on the third plane is perpendicular to the bearing surface 420. The bearing seat 4 maintains movement in a direction perpendicular to the bearing surface 420, thereby keeping the scanned object in a fixed posture (bearing surface upward).

[0089] If the support 4 switches from the horizontal straight scanning segment to the vertical straight scanning segment, since the support surface is facing upward in both segments, the scanned object can maintain the same posture.

[0090] In the embodiments of this application, the center points of the first connecting hole and the second connecting hole are located on a first plane and a second plane parallel to the bearing surface, respectively, or projected onto the same straight line perpendicular to the bearing surface. This allows the connection points of the transmission mechanism 2 and the guide member with the bearing seat 4 to form a defined alignment relationship in space, keeping the bearing surface 420 facing a fixed direction, preventing the bearing seat 4 from rotating or shifting during movement, ensuring that the movement trajectory and posture of the bearing seat 4 always meet the preset requirements, and improving the stability of the movement of the bearing seat 4.

[0091] like Figures 2-3 As shown, according to an embodiment of this application, the plurality of straight line scanning segments may include a first straight line scanning segment 31 and a second straight line scanning segment 32, and the plurality of local guide paths in the annular guide path 6 include a first guide path 61 and a second guide path 62; wherein, the first straight line scanning segment 31 corresponds to the first guide path 61, and their center lines are located on the first plane and the second plane respectively; the second straight line scanning segment 32 corresponds to the second guide path 62, and their center lines are projected onto the same straight line of the third plane.

[0092] The first linear scanning segment 31 corresponds to the trajectory of the center point of the first connecting hole 430. The first guide path 61 corresponds to the trajectory of the center point of the second connecting hole 440. The first linear scanning segment 31 and the first guide path 61 correspond, and their centerlines are located in the first plane and the second plane, respectively. During the movement of the first linear scanning segment 31, the bearing seat 4 moves in a direction parallel to the first plane and the second plane, so that the bearing surface 420 remains parallel to the first plane and the second plane where the first linear scanning segment 31 and the first guide path 61 are located.

[0093] For example, the trajectory of the center point of the first connecting hole corresponding to the first linear scanning segment 31 can be closer to the edge of the support frame 1 than the trajectory of the center point of the second connecting hole corresponding to the first guide path 61. The distance between the first plane and the second plane where the center line of the first linear scanning segment 31 and the first guide path 61 are located is equal to the difference in distance between the center point of the first connecting hole 430 and the center point of the second connecting hole 440 from the bearing surface.

[0094] The second linear scanning segment 32 corresponds to the second guide path 62, and their center lines are projected onto the same straight line of the third plane. During the movement of the second linear scanning segment 32, the support 4 moves along the direction determined by the line connecting the center points of the first connecting hole 430 and the second connecting hole 440, which keeps the support surface 420 perpendicular to the direction of the second linear scanning segment 32 and the second guide path 62.

[0095] The embodiments of this application are designed so that the first linear scanning segment 31 corresponds to the first guide path 61 and the second linear scanning segment 32 corresponds to the second guide path 62, so that the movement of the support 4 in each scanning segment is subject to the expected guiding constraint, so that the support 4 maintains a stable moving posture and provides structural support for data acquisition.

[0096] According to an embodiment of this application, when the scanned object passes through the first linear scanning segment, the X-ray beam emitted by the X-ray source in the first linear scanning segment can be perpendicular to the bearing surface; when the scanned object passes through the second linear scanning segment, the X-ray beam emitted by the X-ray source in the second linear scanning segment can be parallel to the bearing surface.

[0097] like Figures 2-3 As shown, in embodiments of this application, the scanning device 5 can be positioned near the first and second linear scanning segments. For example, the X-ray source 51 of each scanning device 5 is positioned on both sides of the support frame 1 and away from the interior of the support frame 1, while the detector 52 is positioned on both sides of the support frame 1 and close to the interior of the support frame 1. This forms a layout that irradiates from the outer periphery of the support frame 1 to the inner side of the support frame 1. The positions of the X-ray source 51 and the detector 52 can also be interchanged. Considering the volume occupied by both, it is preferable that the X-ray source 51 is positioned on both sides of the support frame 1 and away from the interior of the support frame 1, while the detector 52 is positioned on both sides of the support frame 1 and close to the interior of the support frame 1.

[0098] For example, the X-ray beam emitted by the X-ray source 51 can be configured to be perpendicular to the first linear scanning segment 31 and the second linear scanning segment 32, respectively. Since the bearing surface 420 is parallel to the direction of the first linear scanning segment 31 when the bearing 4 passes through it, the X-ray beam emitted by the X-ray source in the first linear scanning segment 31 is perpendicular to the bearing surface 420. Since the bearing surface 420 is perpendicular to the direction of the second linear scanning segment 32 when the bearing 4 passes through it, and the X-ray beam emitted by the X-ray source is also perpendicular to the second linear scanning segment 32, the X-ray beam emitted by the X-ray source in the second linear scanning segment 32 is parallel to the bearing surface 420.

[0099] In the embodiments of this application, the scanning object can achieve vertical and parallel X-ray beam angles by passing through the first and second straight line scanning segments, realizing coverage scanning of the front and side dimensions of the scanning object. Compared with single-angle scanning, it can obtain more dimensional structural information of the scanning object, fill the information blind spots of single-angle scanning, and make the acquired projection data more comprehensive and complete, providing data support for generating three-dimensional CT images, especially suitable for scanning local details of flat objects.

[0100] According to an embodiment of this application, when the scanned object passes through the first linear scanning segment 31, a first surface angle can be formed between the detection surface of the detector in the first linear scanning segment 31 and the bearing surface 420; when the scanned object passes through the second linear scanning segment, a second surface angle can be formed between the detection surface of the detector in the second linear scanning segment 32 and the bearing surface 420, and the first surface angle and the second surface angle are not equal.

[0101] The detector's detection surface corresponds to the X-ray beam emitted by the X-ray source. When the scanned object passes through the first linear scanning segment, the first angle formed between the detection surface of the detector in that scanning segment and the supporting surface is determined by the X-ray beam propagation direction of the first scanning segment. Similarly, when the scanned object passes through the second linear scanning segment, the second angle formed between the detection surface of the detector in that scanning segment and the supporting surface is determined by the X-ray beam propagation direction of the second scanning segment.

[0102] When the X-ray beam emitted by the X-ray source in the first linear scanning segment is perpendicular to the supporting surface, a first surface angle can be formed between the detector surface and the supporting surface to receive as much projection data as possible from the X-ray beam. For example, the first surface angle can be 0° to 30°, such as 1°, 5°, 10°, or any value within the above range.

[0103] When the X-ray beam emitted by the X-ray source in the second linear scanning segment is parallel to the supporting surface, a second surface angle can be formed between the detector surface and the supporting surface in the second linear scanning segment to receive the projection data formed by the X-ray beam as much as possible. For example, the second surface angle can be 60°~90°, such as 60°, 65°, 75°, 80°, etc., or any value within the above range. Angles greater than 90° can be expressed in degrees using their supplementary angles.

[0104] The different detection surface angles in the embodiments of this application allow the detector to accurately adapt to the propagation direction of the corresponding X-ray beam, enabling the detector to receive the X-ray beam passing through the scanned object at the optimal angle, thereby improving the sensitivity and accuracy of X-ray detection and avoiding attenuation and distortion of projection data signals caused by mismatched detection surface angles, thus improving the overall imaging accuracy.

[0105] According to an embodiment of this application, the first face angle can be approximately 0°, and the second face angle can be approximately 90°.

[0106] In the first linear scanning segment (e.g., a horizontal scanning segment), the X-ray source emits a beam vertically downwards, with the detection surface parallel to the supporting surface (approximately 0°). This allows the beam to directly strike the detection surface, resulting in better X-ray signal reception in this scanning segment. Similarly, in the second linear scanning segment (e.g., a vertical scanning segment), the X-ray source emits a beam horizontally, with the detection surface perpendicular to the supporting surface (approximately 90°). This also allows the horizontal beam to directly strike the detection surface, achieving good X-ray signal reception in this scanning segment.

[0107] Minor precision errors may exist during the processing and assembly of components. For example, a slight deviation of ±1° to ±3° is permissible for approximately 0° or approximately 90°, ensuring that the first surface angle is approximately 0°, such as 0.01°, 0.1°, 1°, or 3°. The second surface angle only needs to be approximately 90°, such as 89.99°, 89.9°, 89°, or 87°. This will not have a substantial impact on the quality of the projection data or the subsequent reconstruction of CT images.

[0108] In the embodiments of this application, the first surface angle is approximately 0° and the second surface angle is approximately 90°, so that the detector surface is parallel and perpendicular to the supporting surface, respectively, which is adapted to the propagation direction of the X-ray beam in the first and second linear scanning segments. The X-ray beam is received perpendicularly to the detector surface, which can improve the acquisition efficiency and accuracy of the projection data.

[0109] According to an embodiment of this application, the first linear scanning segment and the second linear scanning segment are connected, and an angle of approximately 90° can be formed between them.

[0110] The first and second linear scanning segments are connected, forming an angle of approximately 90° between them. This allows the X-ray sources of the first and second linear scanning segments to form a 90° emission angle in space, thereby enabling the X-ray beam to irradiate the scanned object from both vertical and horizontal dimensions.

[0111] The first and second linear scanning segments form an angle of approximately 90°, which allows the overall spatial layout of the first and second linear scanning segments to be rectangular, facilitating the layout of circular paths. If the angle between the scanning segments is other than this, it can easily cause the support 4 to shift or tilt when turning, disrupting the posture stability of the scanned object and increasing the design difficulty of the components.

[0112] Because minor precision errors may exist in the processing and assembly of parts, the angle between the first and second linear scanning segments should be approximately 90°. For example, the angle between the first and second linear scanning segments can be 90° ± 3°, such as 89.9°, 87°, etc.

[0113] In the embodiments of this application, the approximately 90° angle between the first and second linear scanning segments allows them to be arranged vertically in space, enabling the X-ray beam to scan perpendicularly and parallel to the supporting surface. The annular transmission path 3 has a more compact structure, reducing the overall space occupied by the system.

[0114] According to an embodiment of this application, the posture of the scanned object when passing through the first straight line scan segment and the posture when passing through the second straight line scan segment can be the same.

[0115] The orientation of the scanned object can include its angle and placement in space. From the moment the object enters the first linear scanning segment to the moment it passes through the second linear scanning segment, its angle and placement change only along the circular path with the support 4, without any tilting, twisting, offsetting, or flipping. For example, with the horizontal plane as a reference, the object's levelness through the first and second linear scanning segments is consistent, and the angle between the object and the support surface remains 0°. The object's position on the support plate remains unchanged, without sliding or shifting, and it remains centered within the scanning area without deviation.

[0116] The consistent posture design of the embodiments of this application allows the scanned object to maintain a fixed spatial position and angle during the scanning process of the first and second linear scanning segments, avoiding misalignment of the projection data in spatial coordinates due to posture changes. This reduces the difficulty of image stitching and data processing of the imaging device, resulting in higher accuracy of the stitched CT image and avoiding problems such as image distortion and misalignment.

[0117] According to an embodiment of this application, when the scanned object passes through the first straight line scan segment, the orthographic projection area of ​​the scanned object and the orthographic projection area of ​​the first straight line scan segment may at least partially intersect; when the scanned object passes through the second straight line scan segment, the orthographic projection area of ​​the scanned object and the orthographic projection area of ​​the second straight line scan segment may be independent of each other.

[0118] The orthographic projection area of ​​the scanned object can be a projection area on a horizontal plane, a projection area parallel to the supporting surface, or a projection area on the surface on which the linear scanning CT imaging system is placed (such as the ground).

[0119] The orthographic projection area of ​​a linear scanning segment is closely related to the orthographic projection area formed on the projection plane by the coverage of the X-ray beam of the linear scanning segment. The orthographic projection area of ​​the linear scanning segment is the effective area that the X-ray beam emitted from the X-ray source can irradiate, which is the effective working range of the scan.

[0120] When the scanned object passes through the first linear scanning segment, the orthographic projection area of ​​the scanned object intersects at least partially with the orthographic projection area of ​​the first linear scanning segment, so that the scanned object is partially or completely covered by the ray beam of the first linear scanning segment.

[0121] Mutually independent means that the two projection areas do not overlap on the projection plane and are in a separate state. When the scanned object passes through the second linear scanning segment, the orthographic projection area of ​​the scanned object and the orthographic projection area of ​​the second linear scanning segment are independent of each other. That is, the X-ray beam emitted by the X-ray source does not illuminate the scanned object from a direction perpendicular to the orthographic projection area of ​​the second linear scanning segment. For example, when the scanned object passes through the second linear scanning segment, the X-ray beam illuminates the scanned object from its side, achieving multi-angle detection.

[0122] The embodiments of this application demonstrate the intersection and independence between the orthographic projection area of ​​the scanned object and the projection area of ​​the scan segment when the scanned object passes through the first straight line scan segment and the second straight line scan segment. This enables multi-angle scanning of the scanned object, improving the efficiency and diversity of data acquisition.

[0123] According to an embodiment of this application, the transmission mechanism 2 may include a slider configured to be rotatably connected to the first connecting hole 430 to connect the first vertical plate 432 to the first linear scanning segment or the second linear scanning segment; and / or, the guide member 41 includes a guide wheel configured to connect one end away from the wheel to the second connecting hole, and the other end where the wheel is located to the first guide path or the second guide path.

[0124] Since the annular transport path 3 is circular, the slider's posture may change as the path 3 moves. For example, when the slider moves along a vertical straight path, it has the first posture; when it moves along a horizontal straight path, it has the second posture. Compared to the second posture, the slider has rotated 90°. The slider is rotatably connected to the first connecting hole 430, ensuring that the posture of the first vertical plate and the support portion where the first connecting hole 430 is located remains unchanged even when the slider's posture changes, thus preventing the posture of the scanned object from changing.

[0125] The connection between the end of the guide member 41 away from the wheel and the second connecting hole 440 can be a fixed connection or a slightly rotatable connection (such as bolt fastening or bearing sleeve), so that the guide wheel and the bearing seat 4 move synchronously, and the direction and posture of the bearing seat 4 are constrained.

[0126] The connection between the other end of the guide member 41 where the wheel is located and the first guide path 61 or the second guide path 62 can be a rolling fit. For example, the wheel body of the guide wheel contacts the groove of the first guide path or the second guide path, converting sliding friction into rolling friction and reducing movement resistance.

[0127] The rotatable connection between the transmission mechanism and the first connecting hole in the embodiments of this application allows the carrier 4 to flexibly adjust the connection angle according to changes in the path when moving along the annular path. This prevents the carrier 4 from rolling over, causing changes in the posture of the scanned object or even slipping, thus improving the stability of the movement. The rolling connection of the guide wheel replaces the sliding connection, which reduces the friction between the guide path and the guide component, reduces energy loss and component wear, improves the service life of the system, and makes the movement of the carrier 4 smoother and more precise.

[0128] like Figure 4 As shown, according to an embodiment of this application, the transmission mechanism 2 may further include: a connecting block 45, one side of which is provided with a protrusion 451 for rotatably connecting with the first connecting hole 430, and the other side is fixedly connected to the slider.

[0129] Figure 6 The diagram illustrates a connection block structure according to an embodiment of this application.

[0130] like Figure 6 As shown, the connecting block 45 is rotatably connected to the first connecting hole 430 via a protrusion 451. The protrusion 451 can be, for example, cylindrical. The protrusion 451 and the first connecting hole 430 are circumferentially fitted, thereby achieving a rotatable connection. The protrusion structure of the connecting block is simple and easy to manufacture and assemble. The other side of the connecting block is fixedly connected to the slider. For example, the connecting block can be fixedly connected to the slider by bolts or welding.

[0131] In the embodiments of this application, the connecting block achieves rotational engagement with the first connecting hole through a protrusion. On the other hand, the connecting block is fixedly connected to the slider, so that the linear motion of the slider in different linear scanning segments can be smoothly converted into the circular motion of the carrier 4, avoiding the carrier 4 from directly rotating and changing the posture of the scanned object, thereby improving the accuracy of scanning.

[0132] Figure 7 A schematic diagram of another support structure according to an embodiment of this application is shown.

[0133] like Figure 7 As shown, according to an embodiment of this application, the carrier 4 may further include: a tray 46 disposed on the carrier surface, the tray being configured to carry the scanned object; and a plurality of constraint members 461 disposed on the tray and configured to constrain the movement of the scanned object.

[0134] The tray 46 can be used to directly support the scanned object, and its shape and size can be designed according to the structural characteristics of the scanned object (such as flat, cylindrical, or square).

[0135] The pallet 46 is fixedly connected to the bearing surface to ensure stability. For example, the bearing surface has at least two positioning protrusions. The pallet is placed on the bearing surface, and its bottom has multiple positioning holes, at least two of which mate with at least two positioning protrusions. The positioning protrusions can be shaped to match the positioning holes; for example, the positioning holes are circular, and the positioning protrusions are cylindrical. The engagement of at least two positioning holes and at least two positioning protrusions fixes the pallet in place on the bearing surface, preventing deflection or displacement.

[0136] The tray 46 can be made of metal (e.g., aluminum alloy) or non-metal (e.g., plastic). For example, if the object being scanned is a battery cell, the tray 46 can be made of a non-conductive material, or it can be made of a conductive material as the substrate but with an insulating surface treatment.

[0137] Multiple constraint members 461 can be limiting and fixing components on the tray, with two or more in number. These constraint members can be used to constrain the movement of the scanned object on the tray, limiting its displacement freedom in horizontal, vertical, and other directions, allowing the scanned object and the tray to form a relatively fixed whole, moving synchronously with the support 4 without sliding, shifting, or tipping. The specific positions of the constraint members on the tray can be adapted to the specific shape of the scanned object; for example, if the scanned object has a regular shape, they can be evenly distributed along the outer perimeter of the scanned object.

[0138] The tray in this application is used to support the scanning object and can be adapted to scanning objects of different shapes. Multiple constraints can limit and fix the scanning object, preventing the scanning object from sliding or shifting during the movement of the support 4 and during scanning. This ensures that the scanning object is always in the preset position of the scanning area, which can improve the positional accuracy of the projection data acquisition. At the same time, the design of the constraints can be adapted to scanning objects of different specifications, which improves the versatility of the system.

[0139] like Figures 2-3 As shown, according to an embodiment of this application, each scanning device 5 may include: a first radiation source 511; a first detector 521, wherein, during the scanning process of the object being scanned passing through the scanning area of ​​the first radiation source 511, the first radiation source 511 and the first detector 521 are located on opposite sides of the object being scanned; a second radiation source 512, opposite to the first radiation source 511, wherein the radiation beam emitted by the second radiation source 512 and the radiation beam emitted by the first radiation source 511 pass through different areas of the object being scanned; and a second detector 522, opposite to the first detector 521, wherein, during the scanning process of the object being scanned passing through the scanning area of ​​the first radiation source 511, the second radiation source 512 and the second detector 522 are located on opposite sides of the object being scanned.

[0140] The first radiation source 511 and the second radiation source 512 can be symmetrically distributed relative to the support 4 or the object being scanned. For example, the first radiation source 511 and the first detector 521 can be located near the first side of the support frame 1, and the second radiation source 512 and the second detector 522 can be located near the second side of the support frame 1. The radiation beam emitted by the second radiation source 512 and the radiation beam emitted by the first radiation source 511 pass through different areas of the object being scanned, irradiating different areas of the object, thereby allowing the first detector 521 and the second detector 522 to receive projection data from different areas.

[0141] The first radiation source 511 and the second radiation source 512 scan in parallel, enabling the detection of two regions of the object to be scanned in one movement, which improves detection efficiency compared to using a single radiation source.

[0142] For example, a ring-shaped guide rail pair (ring-shaped conveying path) is mounted on one side of the support frame. Multiple sliders (transmission mechanisms) are mounted on the guide rail pair, and sliding seats (carrier seats) are fixed on the sliders. A guide rail (ring-shaped guide path) is mounted on the other side of the support frame. The carrier seat includes a tray seat (carrier part), a connecting seat (connecting block), and guide wheels. The carrier part is connected to the sliders via the connecting block, and its guide wheels are mounted on the guide rail. Multiple sliders can be driven to move on the ring-shaped guide rail via a synchronous belt or chain, thereby moving the carrier seat. Because the carrier seat is simultaneously acted upon by the guide rail, its horizontal posture remains unchanged during both horizontal and vertical movement, thus ensuring that the posture of the tray on the carrier seat remains unchanged during both horizontal and vertical movement. The object to be scanned (the object being scanned) is loaded from the loading position and placed on the tray. It is pulled horizontally by the moving tray and passes through the vertical optical path formed by the X-ray source and detector fixed on the support, completing the horizontal linear scan. It continues to move along the circular guide rail and passes through the horizontal optical path formed by the X-ray source and detector fixed on the support in the vertical segment, completing the vertical linear scan. The scan images from both ends are merged to form a complete CT image.

[0143] Each scanning device 5 in the embodiments of this application includes a first X-ray source 511 and a first detector 521, a second X-ray source 512 and a first detector 521, which realizes simultaneous scanning of two regions of the object to be scanned, which can improve the data acquisition efficiency within the same scanning segment. At the same time, the relatively set layout allows the X-ray beam to penetrate from both sides of the object to be scanned, which can obtain more structural information of the object to be scanned, and can improve the system's ability to detect large-sized objects.

[0144] Figure 8 A schematic diagram of a battery cell according to an embodiment of this application is shown.

[0145] like Figure 8As shown, according to an embodiment of this application, the scanning object may include a flat-shaped battery cell.

[0146] Flat-shaped battery cells can have a thickness smaller than their length and / or width, and their forms include square hard-shell flat cells (e.g., used in mobile phones or tablets) and soft-pack flat cells for power batteries (e.g., used in new energy vehicles). For example, the length and width of a flat-shaped battery cell are approximately 100-300 mm, and its thickness is 2-50 mm.

[0147] A tab 71 may be provided at one end or at opposite ends of the battery cell. For example, two sets of metal tabs may extend from both ends of the battery cell, namely a positive tab and a negative tab, for leading the current inside the battery cell to an external circuit. The surface of the battery cell may be thermo-sealed using an aluminum-plastic composite film 72. The interior of the battery cell may include a positive electrode, a negative electrode, a separator, and an electrolyte.

[0148] Defects in flat battery cells may be distributed on the front and back planes (e.g., internal electrode misalignment, bubbles) and on the sides and tabs (e.g., encapsulation leakage, poor soldering). The multiple scanning devices 5 in this embodiment are respectively arranged in multiple linear scanning segments. The transmission mechanism and the ring-shaped conveying path 3 are designed to stably transport the battery cells to multiple linear scanning segments for inspection. The battery cells can be scanned from multiple angles, covering areas such as the front and back planes, sides, and tabs, thus meeting the needs for three-dimensional defect detection in flat battery cells.

[0149] The design of the carrier, first connecting part, second connecting part, carrier seat 4 tray, and constraint members in this embodiment can fix the position of the battery cell during the testing process, further ensuring that the battery cell's posture remains unchanged, and ensuring that the X-ray beam always penetrates the battery cell along a preset path, thus meeting the accuracy requirements of battery cell testing.

[0150] The embodiments of this application have at least one support 4 and a ring conveying path 3, which can realize continuous feeding, inspection and unloading of battery cells, and adapt to the high-speed online inspection requirements in the battery cell production process.

[0151] The embodiments of this application, taking into account the flat structural characteristics of lithium battery cells, combined with the aforementioned multi-dimensional and multi-angle scanning design, can accurately capture the local structural details of the cell, solving the problem of low local imaging accuracy of flat objects by traditional linear CT. At the same time, the continuous scanning design of the system is adapted to the online batch inspection requirements of lithium battery cells, which can improve the inspection efficiency of lithium battery cells and fit the actual application scenarios of industrial production.

[0152] Based on the above-described linear scanning CT imaging system, this application also provides a linear scanning CT imaging method using any of the above systems.

[0153] The linear scanning CT imaging method includes: driving a drive mechanism to move a transmission mechanism along a circular transport path, wherein at least one carrier mounted on the transmission mechanism carries at least one scanning object, and the carrier 4 can follow the transmission mechanism to move along the circular transport path to pass through multiple linear scanning segments, and multiple local linear paths in the circular transport path form multiple linear scanning segments; emitting a radiation beam from a radiation source to form a scanning area, and detecting the projection data formed after the radiation beam passes through the scanning object as it passes through the scanning area, wherein multiple scanning devices are respectively set in multiple linear scanning segments, and each scanning device includes at least one radiation source and at least one detector; and generating a computed tomographic image of the scanning object by an imaging device based on the multiple projection data detected by each detector in the multiple linear scanning segments.

[0154] The method in this application utilizes the working principle of the imaging system, which can be referred to in the description of the above embodiments, and will not be repeated here.

[0155] The method of this application transforms the structural advantages of the system into practical advantages in the detection process by driving the carrier to continuously pass through each linear scanning segment, synchronously collecting projection data by multiple sets of scanning devices, and integrating the data to generate an image by the imaging device. The continuous operation steps ensure detection efficiency, and the multi-dimensional data acquisition and integration steps ensure imaging accuracy. At the same time, the standardized design of the method makes the operation of the system more standardized and convenient, adapting to the large-scale application needs of industrial online detection.

[0156] Those skilled in the art will understand that the features described in the various embodiments of this application can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, the features described in the various embodiments of this application can be combined and / or combined in various ways without departing from the spirit and teachings of this application. All such combinations and / or combinations fall within the scope of this application.

Claims

1. A linear scanning CT imaging system, comprising: Support frame; A conveying device is installed on the support frame. The conveying device includes a driving mechanism, a transmission mechanism, and a circular conveying path. The driving mechanism is configured to drive the transmission mechanism to move along the circular conveying path. Multiple local straight paths in the circular conveying path form multiple straight scanning segments. At least one carrier is mounted on the transmission mechanism and configured to carry at least one scanned object. The carrier is capable of moving along the annular conveying path with the transmission mechanism to pass through the plurality of linear scan segments. Multiple scanning devices are respectively set in the multiple linear scanning segments. Each scanning device includes at least one X-ray source and at least one detector. The X-ray source is configured to emit X-ray beams to form a scanning area. The detector is configured to detect the projection data formed after the X-ray beam passes through the scanning object as the scanning object passes through the scanning area. The multiple X-ray sources in the multiple linear scanning segments emit multiple X-ray beams from multiple angles relative to the scanning object. An imaging device is used to generate a computed tomographic image of the object being scanned based on multiple projection data detected by each detector in the multiple linear scan segments.

2. The system according to claim 1, further comprising: A circular guide path is installed on the first side of the support frame; At least one guide element is installed in the annular guide path, and the at least one guide element is connected to the at least one support seat; The annular conveying path is installed on the second side of the support frame, and the second side is opposite to the first side.

3. The system according to claim 2, characterized in that, The annular guide path is close to the annular contour edge of the first side of the support frame, and the annular conveying path is close to the annular contour edge of the second side of the support frame.

4. The system according to claim 2, characterized in that, The support includes: The support portion is configured to define a support surface to support the scanned object; A first connecting portion has a first end connected to the bearing portion and extends from the first end to a second end in a direction away from the bearing surface, and the second end of the first connecting portion is configured to be connected to the transmission mechanism; The second connecting portion is opposite to the first connecting portion. The first end of the second connecting portion is connected to the bearing portion and extends from the first end to the second end in a direction away from the bearing surface. The second end of the second connecting portion is configured to be connected to the guide member.

5. The system according to claim 4, characterized in that, The support frame includes: An annular end face, the two sides of which are connected to the first side face and the second side face, respectively; The support portion is configured to face the annular end face, and when the support seat passes through the plurality of linear scanning segments, the support surface has a plurality of included angles relative to the annular end face.

6. The system according to claim 4 or 5, characterized in that, The supporting portion includes a supporting plate defining the supporting surface; The first connecting portion includes a first extension and a first upright plate connected to the transmission mechanism. The first extension is connected to the support plate and extends in a direction away from the support plate. The first upright plate is connected to the first extension and is perpendicular to the support surface. The second connecting portion includes a second extension and a second upright plate connected to the guide member. The second extension is connected to the bearing plate and extends in the same direction as the first extension. The second upright plate is connected to the second extension and is perpendicular to the bearing surface. The second upright plate is disposed opposite to the first upright plate.

7. The system according to claim 6, characterized in that, The first upright plate is provided with a first connecting hole, and the second upright plate is provided with a second connecting hole. The center point of the first connecting hole and the center point of the second connecting hole are located on a first plane and a second plane, respectively, and the first plane and the second plane are parallel to the bearing surface; and / or, the movement trajectories of the center points of the first connecting hole and the second connecting hole are projected onto the same straight line of a third plane, and the third plane is perpendicular to the bearing surface.

8. The system according to claim 7, characterized in that, The plurality of straight line scanning segments include a first straight line scanning segment and a second straight line scanning segment, and the plurality of local guide paths in the annular guide path include a first guide path and a second guide path; The first straight line scanning segment corresponds to the first guide path, and their centerlines are located on the first plane and the second plane, respectively; the second straight line scanning segment corresponds to the second guide path, and their centerlines are projected onto the same straight line of the third plane.

9. The system according to claim 8, characterized in that: When the scanned object passes through the first linear scanning segment, the ray beam emitted by the ray source in the first linear scanning segment is perpendicular to the bearing surface; When the scanned object passes through the second linear scanning segment, the X-ray beam emitted by the X-ray source in the second linear scanning segment is parallel to the bearing surface.

10. The system according to claim 8 or 9, characterized in that: When the scanned object passes through the first straight scanning segment, a first surface angle is formed between the detector surface of the detector and the bearing surface in the first straight scanning segment; When the scanned object passes through the second linear scanning segment, a second surface angle is formed between the detector surface of the detector in the second linear scanning segment and the bearing surface, and the first surface angle and the second surface angle are not equal.

11. The system as claimed in claim 10, characterized in that, The first face has an angle of approximately 0°, and the second face has an angle of approximately 90°.

12. The system according to claim 8, characterized in that, The first linear scanning segment and the second linear scanning segment are connected, forming an angle of approximately 90° between them.

13. The system according to any one of claims 8, 9, 11, and 12, characterized in that, The posture of the scanned object when passing through the first straight line scan segment is the same as the posture when passing through the second straight line scan segment.

14. The system according to claim 13, characterized in that, When the scanned object passes through the first straight line scan segment, the orthographic projection area of ​​the scanned object intersects at least partially with the orthographic projection area of ​​the first straight line scan segment; When the scanned object passes through the second straight line scan segment, the orthographic projection area of ​​the scanned object is independent of the orthographic projection area of ​​the second straight line scan segment.

15. The system according to claim 8, characterized in that: The transmission mechanism includes a slider configured to be rotatably connected to the first connecting hole to connect the first vertical plate to the first linear scanning segment or the second linear scanning segment; And / or, The guide includes a guide wheel, configured such that one end away from the wheel is connected to the second connecting hole, and the other end where the wheel is located is connected to the first guide path or the second guide path.

16. The system according to claim 15, characterized in that, The transmission mechanism also includes: The connecting block has a protrusion on one side for rotatable connection with the first connecting hole, and a fixed connection on the other side with the slider.

17. The system according to claim 4, characterized in that, The support also includes: A tray is disposed on the support surface, and the tray is configured to support the scanned object; Multiple constraint elements are disposed on the tray and configured to constrain the movement of the scanned object.

18. The system according to claim 1, characterized in that, Each scanning device includes: First radiation source; A first detector, wherein, as the scanned object passes through the scanning area of ​​the first radiation source, the first radiation source and the first detector are located on opposite sides of the scanned object; A second radiation source, opposite to the first radiation source, emits a beam of radiation that passes through different regions of the scanned object, as does the beam emitted by the first radiation source. A second detector is positioned opposite the first detector, wherein, as the scanned object passes through the scanning area of ​​the first radiation source, the second radiation source and the second detector are located on opposite sides of the scanned object.

19. The system according to claim 1, characterized in that, The scanned objects include flat-shaped battery cells.

20. A linear scanning CT imaging method applied to the system of any one of claims 1 to 19, comprising: The drive mechanism drives the transmission mechanism to move along the annular conveying path, wherein at least one carrier mounted on the transmission mechanism carries at least one scanning object, and the carrier can follow the transmission mechanism to move along the annular conveying path to pass through multiple straight scanning segments, and the multiple local straight paths in the annular conveying path form multiple straight scanning segments. The X-ray source emits a beam of X-rays to form a scanning area. The detector detects the projection data formed after the X-ray beam passes through the scanning object as the scanning object passes through the scanning area. Multiple sets of scanning devices are respectively set in the multiple straight-line scanning segments. Each set of scanning devices includes at least one X-ray source and at least one detector. The imaging device generates a computed tomography image of the scanned object based on multiple projection data detected by each detector in the multiple linear scan segments.

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