Linear scanning CT imaging system and imaging method

Abstract

Embodiments of the present application provide a linear scanning CT imaging system and an imaging method. The linear scanning CT imaging system comprises a plurality of support frames, a plurality of conveying devices respectively installed on the plurality of support frames, each conveying device comprising a driving mechanism, a transmission mechanism and an annular conveying path, the driving mechanism being configured to drive the transmission mechanism to move along the annular conveying path, the plurality of annular conveying paths forming a plurality of linear scanning sections through local linear paths, a plurality of bearing seats configured to carry at least one scanning object, a plurality of sets of scanning devices respectively arranged in the plurality of linear scanning sections, each set of scanning devices comprising at least one ray source and at least one detector, the ray source emitting a ray beam, and the detector detecting projection data formed after the ray beam passes through the scanning object, and an imaging device configured to generate a computed tomography image of the scanning object according to a plurality of projection data detected by each detector of the plurality of linear scanning sections.

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: multiple support frames; multiple transport devices respectively mounted on the multiple support frames, each 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, the multiple annular transport paths forming multiple linear scanning segments through local linear paths; multiple carriers configured to carry at least one scanned object, each transmission mechanism being connected to at least one carrier to drive at least one carrier to move along the annular transport path, wherein the scanned object can be placed on carriers connected by different transmission mechanisms to pass through 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 at least one transfer device, wherein each transfer device is configured to transfer a scanned object irradiated by a X-ray beam in one linear scan segment to another linear scan segment to receive X-ray beam irradiation.

[0006] According to an embodiment of this application, the system further includes at least one connecting bracket, wherein each connecting bracket is configured to connect adjacent support frames to fix the relative position between adjacent support frames.

[0007] According to an embodiment of this application, the carrier includes: a carrier portion configured to define a carrier surface, wherein the carrier surface is provided with at least two positioning protrusions; a tray disposed on the carrier surface, wherein the bottom of the tray is provided with a plurality of positioning holes, wherein at least two positioning holes cooperate with at least two positioning protrusions, and the tray is configured to carry a scanning object; and a third connecting portion, wherein a first end is connected to the carrier portion and a second end is connected to a transmission mechanism.

[0008] According to an embodiment of this application, the plurality of positioning holes include: a central hole; a plurality of circumferential holes distributed circumferentially along the central hole; wherein at least two positioning protrusions include a first protrusion that mates with the central hole, and at least one second protrusion that mates with at least one circumferential hole.

[0009] According to an embodiment of this application, the scanning object can be placed on a carrier connected by different transmission mechanisms to pass through multiple linear scanning segments, including: the tray carrying the scanning object is transferred from its current carrier to another carrier connected by a transmission mechanism.

[0010] According to an embodiment of this application, the tray carrying the scanned object engages with at least two positioning protrusions in the carrier before and after transfer via at least two positioning holes at the same position.

[0011] According to embodiments of this application, the scanning object maintains a consistent posture while being placed on a carrier connected by different transmission mechanisms.

[0012] According to an embodiment of this application, the plurality of support frames include: a first support frame, wherein a first conveying device among the plurality of conveying devices is disposed on the first support frame, and the horizontal path of the first annular conveying path of the first conveying device forms a first straight scanning segment; and a second support frame, arranged in an L-shape with the first support frame, wherein a second conveying device among the plurality of conveying devices is disposed on the second support frame, and the horizontal path of the second annular conveying path of the second conveying device forms a second straight scanning segment, the second straight scanning segment being perpendicular to the first straight scanning segment.

[0013] According to an embodiment of this application, the transmission mechanism in the first linear scanning segment moves along a first direction, and the transmission mechanism in the second linear scanning segment moves along a second direction. The conveying end of the transmission mechanism in the first linear scanning segment approaches the conveying starting end of the transmission mechanism in the second linear scanning segment, and the scanning object is transferred from the conveying end to the conveying starting end.

[0014] According to an embodiment of this application, a plurality of carrier seats include: a first carrier seat connected to a first transmission mechanism of a first conveying device, comprising: a first carrier plate; a first connecting plate, bent relative to the first carrier plate, wherein a first end is connected to the first carrier plate and a second end is connected to the first transmission mechanism.

[0015] According to an embodiment of this application, the first support frame includes an intersecting first annular end face and a first side face, and a first annular conveying path is installed on the first side face. The bottom surface of the first bearing plate is opposite to the first annular end face during the first linear scanning segment, and one side of the first connecting plate is opposite to the first side face.

[0016] According to an embodiment of this application, a plurality of bearing seats include: a second bearing seat connected to a second transmission mechanism of a second conveying device, comprising: a second bearing plate; a bent portion bent relative to the second bearing plate, the first end of the bent portion being connected to the second bearing plate and the second end being connected to a second connecting plate; and a second connecting plate extending in the opposite direction to the second bearing plate, the first end of the second connecting plate being connected to the second end of the bent portion and the second end being connected to the second transmission mechanism.

[0017] According to an embodiment of this application, the second support frame includes an intersecting second annular end face and a second side face, and a second annular conveying path is installed on the second side face. The side face of the second bearing plate is opposite to the second annular end face during the second linear scanning segment, and one side of the second connecting plate is opposite to the second side face.

[0018] 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.

[0019] 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.

[0020] According to an embodiment of this application, the first face angle is approximately 0° and the second face angle is approximately 90°.

[0021] 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.

[0022] 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.

[0023] According to embodiments of this application, the scanning object includes flat-shaped battery cells.

[0024] The second aspect of this application provides a linear scanning CT imaging method applied to any of the above-mentioned systems, comprising: for any scanned object, driving mechanism of the transmission device driving transmission mechanism to move along a circular transmission path, wherein a carrier mounted on the transmission mechanism carries the scanned object, the carrier being able to follow the transmission mechanism to move along the circular transmission path to pass through a linear scanning segment, wherein the scanned object can be placed on carriers connected by different transmission mechanisms to pass through multiple linear scanning segments; for any linear scanning segment, an X-ray source emitting a X-ray beam to form a scanning area, a detector detecting projection data formed after the X-ray beam passes through the scanned object as it passes through the scanning area, wherein multiple sets of scanning devices are respectively arranged in multiple linear scanning segments, each set of scanning devices including at least one X-ray source and at least one detector; and generating a computed tomography image of the scanned object by an imaging device based on multiple projection data detected by each detector in the multiple linear scanning segments.

[0025] The above-described one or more embodiments have the following beneficial effects: By setting up a multi-support frame carrying a conveyor device with a circular transport path, multiple linear scanning segments are formed using the local straight paths of the circular path. Multiple scanning devices emit X-ray beams from multiple angles towards the object being scanned, and collect projection data. Finally, the imaging device integrates the data to generate a CT image. The multi-support frame design can combine various scanning paths. The circular transport path of the multi-support frame drives the carrier to transport the object being scanned, and the multi-angle X-ray beams collect more comprehensive projection data, obtaining imaging data from multiple angles, thereby improving the accuracy of CT imaging. The continuous scanning mode with multiple linear scanning segments can improve detection efficiency and adapt to online detection requirements. Attached Figure Description

[0026] 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:

[0027] Figure 1This illustration schematically depicts an application scenario of a linear scanning CT imaging system and imaging method according to an embodiment of this application;

[0028] Figure 2 The schematic diagram illustrates a structural schematic of a linear scanning CT imaging system according to an embodiment of this application;

[0029] Figure 3 This schematic diagram illustrates the structural connection between the support base and the transmission mechanism according to an embodiment of this application.

[0030] Figure 4 A schematic diagram of the structure of the first support according to an embodiment of this application is shown;

[0031] Figure 5 A schematic diagram of the structure of the second support according to an embodiment of this application is shown;

[0032] Figure 6 A schematic diagram of a battery cell according to an embodiment of this application is shown. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.).

[0037] 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.

[0038] like Figure 1 As 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.

[0039] 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.

[0040] Linear CT inspection technology features a linear scanning path and is more applicable to the inspection of objects of different sizes, using 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 fine-grained inspections. The transport accuracy and posture consistency of the inspected object during horizontal and vertical movement in linear CT inspection have a significant impact on imaging accuracy. Improving the inspection cycle 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.

[0041] Figure 2The schematic diagram illustrates the structure of a linear scanning CT imaging system according to an embodiment of this application.

[0042] like Figure 2 As shown in the figure, a linear scanning CT imaging system according to an embodiment of this application includes: multiple support frames, multiple conveying devices, multiple carrier seats 4, multiple sets of scanning devices 5, and imaging devices.

[0043] Multiple conveying devices are installed on multiple support frames. Each conveying device includes a drive mechanism, a transmission mechanism 2, and a circular conveying path. The drive mechanism is configured to drive the transmission mechanism 2 to move along the circular conveying path. The multiple circular conveying paths form multiple linear scanning segments through local linear paths.

[0044] Multiple carriers 4 are configured to carry at least one scanned object 7. Each transmission mechanism is connected to at least one carrier 4 to drive at least one carrier to move along a circular conveyor path. The scanned object 7 can be placed on carriers 4 connected by different transmission mechanisms to pass through multiple linear scan segments.

[0045] Multiple scanning devices 5 are respectively set in multiple linear scanning segments. Each scanning device includes at least one X-ray source 51 and at least one detector 52. The X-ray source 51 is configured to emit X-ray beams to form a scanning area. The detector 52 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 51 in the multiple linear scanning segments emit multiple X-ray beams from multiple angles relative to the scanning object 7.

[0046] An imaging device is used to generate a computed tomographic image of the scanned object 7 based on multiple projection data detected by each detector in multiple linear scan 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 number of support frames can be two or more. For example, a linear scanning CT imaging system can have 2, 3, 4 or more support frames. Multiple support frames can support different configurations of the transport device, carrier 4, scanning device 5, and imaging device. Different structures of linear scanning CT imaging systems can be formed using multiple support frames. For example, two support frames can be combined to form an L-shaped linear scanning CT imaging system, or three support frames can be combined to form a zigzag linear scanning CT imaging system. The scanning devices on different support frames can then be used to perform multi-angle scanning of the object 7.

[0049] The conveying device drives the carrier 4 to move the scanning object 7 via a transmission mechanism. By continuously moving the carrier 4 along a preset circular conveying path, the scanning object 7 is moved through each linear scanning segment to complete the scanning, achieving continuous online detection. Multiple conveying devices can be installed on multiple support frames; for example, at least one conveying device can be installed on each support frame.

[0050] The drive mechanism can be a power-providing component, such as a servo motor or stepper motor. The transmission mechanism can be a component that transmits power and drives the carrier to move. The transmission mechanism 2 can include, for example, a timing belt, chain, slider, etc. The conveying device can include multiple transmission mechanisms. For example, the conveying device can include 10 sliders (transmission mechanisms) to continuously convey multiple scanned objects 7 for detection.

[0051] The annular transport path 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 as a whole can be approximated as a rectangle, trapezoid, rounded rectangle, or other polygons. The annular transport path can include horizontal straight scanning segments, vertical straight scanning segments, or oblique scanning segments with a certain angle to the horizontal direction. For example, some annular transport paths on support frames have horizontal straight scanning segments, and some annular transport paths on support frames have vertical straight scanning segments. The horizontal straight path can be the horizontal part of the annular transport path, and the vertical straight path is the part of the annular transport path perpendicular to the horizontal plane. Horizontal and vertical straight scanning segments on the same support frame can be connected by an arc path to form an annular scanning area. When using a straight-scan CT imaging system, the scanned object 7 can sequentially pass through the horizontal and vertical straight scanning segments to complete the horizontal and vertical scanning.

[0052] The carrier 4 is connected to the transmission mechanism 2 and can move along the circular conveying path following the transmission mechanism. The carrier 4 can be used to place and fix the scanning object 7. The carrier 4 can be designed with a structure that is adapted to the shape and specifications of the scanning object 7. For example, the carrier 4 can be a tray type, a cage type, or other shapes that match the scanning object 7.

[0053] 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.

[0054] 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.

[0055] Multiple X-ray sources 51 emit multiple X-ray beams from multiple angles relative to the object being scanned 7, enabling multi-dimensional scanning of the object. For example, the X-ray source in the first linear scan segment emits a beam at a 30° angle (the angle with the surface of the object), the source in the second linear scan segment emits a beam at a 90° angle, and the source in the third linear scan segment emits a beam at a 150° angle. Multiple X-ray sources can compensate for the limitations of single-angle scanning, generating CT images of the object 7, either locally or globally.

[0056] 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, or at least one set of scanning devices can be positioned in one linear scanning segment. For example, one set of scanning devices 5 can be configured in a horizontal scanning segment. The X-ray source 51 of the scanning device 5 emits a vertically downward X-ray beam to form a scanning area. When the scanned object passes through this area, the X-ray beam penetrates the electrode, and the detector 52 on the other side receives the X-ray and records the projection data. Based on the recorded projection data, a computed tomographic image of the scanned object 7 is generated, which can be used to examine the internal defects, structure, and other objects contained within the scanned object 7.

[0057] For example, Figure 2In this linear scanning CT imaging system, a first support frame 11 and a second support frame 12 are included. The first support frame 11 has multiple first transmission mechanisms 21. The second support frame 12 has multiple second transmission mechanisms 22. The first support frame 11 has a first annular transport path 31, and the second support frame 12 has a second annular transport path 32. Each first transmission mechanism 21 is connected to a first carrier 41, and each second transmission mechanism 22 is connected to a second carrier 42. Both the first annular transport path 31 and the second annular transport path 32 have a linear scanning segment formed by a local linear path, and a scanning device is provided in the linear scanning segment. The first carrier 41 drives the scanned object 7 to move along the first annular transport path 31, and the second carrier 42 drives the scanned object 7 to move along the second annular transport path 32. When the scanned object 7 passes through the linear scanning segment, it is scanned by the scanning device 5, obtaining projection data. The imaging device forms a scanned image of the scanned object 7 based on the two-dimensional projection data obtained from the first support frame 11 and the second support frame 12.

[0058] The embodiments of this application employ a multi-support frame equipped with a conveyor device featuring a circular transport path. Multiple linear scanning segments are formed using localized straight paths within the circular path. Multiple scanning devices emit X-ray beams from multiple angles towards the object being scanned, acquiring projection data. Finally, an imaging device integrates the data to generate a CT image. The multi-support frame design allows for various scanning paths. The circular transport path of the multi-support frame drives the carrier to transport the object being scanned, and the multi-angle X-ray beams acquire more comprehensive projection data, resulting in imaging data from multiple angles and thus improving the accuracy of CT imaging. The continuous scanning mode with multiple linear scanning segments enhances detection efficiency and adapts to online detection requirements.

[0059] According to embodiments of this application, the system may further include at least one transfer device, wherein each transfer device is configured to transfer a scanned object irradiated by a X-ray beam in one linear scan segment to another linear scan segment to receive X-ray beam irradiation.

[0060] A transfer device is a mechanical device capable of transferring a scanned object. For example, a transfer device may include at least one of a robotic arm, a translation stage, a suction cup, or a conveyor belt. The transfer device can be used to transfer an object scanned by a beam of X-rays between two or more different linear scanning segments.

[0061] There is at least one transfer device. If there are multiple transfer devices, different transfer devices can complete the transfer independently or in cooperation with each other.

[0062] For example, a transfer device can transfer a scanned object irradiated by a X-ray beam in the first linear scan segment to receive X-ray beam radiation in the second linear scan segment. After the scanned object has received X-ray beam radiation in the second linear scan segment, it can then be transferred to a third linear scan segment to receive X-ray beam radiation.

[0063] For example, the first transfer device can transfer the scanned object, which has been irradiated by the X-ray beam in the first linear scan segment, to the second linear scan segment to receive X-ray beam radiation. After the scanned object has been irradiated by the X-ray beam in the second linear scan segment, the second transfer device can transfer the scanned object to the third linear scan segment to receive X-ray beam radiation.

[0064] For example, the first transfer device and the second transfer device can work together to transfer the scanned object that has been irradiated by the X-ray beam in the first linear scan segment to the second linear scan segment to receive X-ray beam radiation.

[0065] The transfer device in this application can accurately transfer a scanned object that has completed radiation in one linear scan segment to another linear scan segment to continue receiving radiation. The transfer device realizes the connection between different linear scan segments, so that the process of multiple linear scan segments forms a closed loop, which can further improve the continuity and efficiency of the overall detection, and enable the scanned object to complete multi-angle X-ray scanning according to a preset path.

[0066] According to an embodiment of this application, the system may further include: at least one connecting bracket, wherein each connecting bracket is configured to connect adjacent support frames to fix the relative position between adjacent support frames.

[0067] The positional relationship between components such as the X-ray source, detector, and scanning path affects image quality. During scanning, system vibration can cause misalignment between the X-ray source, detector, and scanning path, potentially leading to image blurring. Using connecting brackets to fix adjacent support frames can reduce the vibration of individual support frames. Connecting brackets can be used to connect adjacent support frames, keeping their relative positions fixed, ensuring structural stability and preventing relative displacement.

[0068] The connecting brackets serve a positioning function, ensuring that the annular transport paths and linear scanning segments on each support frame maintain a preset relative position. By fixing adjacent support frames with the connecting brackets, the alignment accuracy of the transfer device when transferring the scanned object from one linear scanning segment to another can be improved.

[0069] There must be at least one connecting bracket, and adjacent support frames can be connected using one, two, or more connecting brackets. For example, the system can contain three support frames, with each pair of adjacent support frames connected by one connecting bracket. The system can also contain two support frames, with each pair of adjacent support frames connected by two connecting brackets.

[0070] For example, Figure 2 In a linear scanning CT imaging system, a first support frame 11 and a second support frame 12 are included. The first support frame 11 and the second support frame 12 can be connected by a connecting bracket 6.

[0071] The embodiments of this application connect adjacent support frames and fix their relative positions using connecting brackets. The connecting brackets can reduce the positional offset between adjacent support frames, allowing the annular conveying path and linear scanning segment on each support frame to maintain a preset relative positional relationship. This improves the path accuracy of the conveying device in transporting the scanned object, as well as the accuracy of the emission and detection positions of the scanning device's X-ray beam. It also reduces imaging deviations caused by support frame displacement, thereby improving the overall scanning and imaging accuracy.

[0072] Figure 3 This schematic diagram illustrates the structural connection between the support base and the transmission mechanism according to an embodiment of this application. Figure 4 A schematic diagram of the structure of the first support according to an embodiment of this application is shown.

[0073] like Figures 3-4 As shown, according to an embodiment of this application, the carrier 4 may include: a carrier portion 40 configured to define a carrier surface 400, wherein the carrier surface is provided with at least two positioning protrusions 46; a tray 44 disposed on the carrier surface 400, wherein the bottom of the tray 44 is provided with a plurality of positioning holes 45, wherein at least two positioning holes 45 cooperate with at least two positioning protrusions 46, and the tray 44 is configured to carry the scanning object; and a third connecting portion 43, the first end of which is connected to the carrier portion 40 and the second end of which is connected to the transmission mechanism 2.

[0074] The positioning protrusion 46 can be shaped to mate with the positioning hole 45. For example, the positioning hole 45 can be a round hole, and the positioning protrusion 46 can be cylindrical. The pallet 44 is fixed at the bearing surface 400 by the engagement of at least two positioning holes 45 and at least two positioning protrusions 46, preventing deflection or displacement. The positioning hole 45 can be a blind hole located at the bottom of the pallet 44, or a through hole penetrating the pallet 44.

[0075] The tray 44 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).

[0076] The tray 44 cooperates with the bearing surface 400 to ensure the stability of the support. The tray 44 and the bearing surface 400 can be movably connected, allowing the tray to be moved from one bearing to another along with the scanned object, facilitating the transfer of the tray 44 on different support frames.

[0077] The tray 44 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 44 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.

[0078] Multiple constraint members can be installed on the tray 44. These constraint members can be limiting and fixing components on the tray, and there can be two or more. The 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.

[0079] The carrier in this embodiment supports the scanning object through a mating structure with positioning protrusions on the carrier and positioning holes on the bottom of the tray, and is then connected to the transmission mechanism via a third connecting part. The mating of the positioning protrusions and positioning holes achieves fixed positioning of the tray on the carrier, preventing the scanning object from shifting or shaking during transport and scanning, ensuring the positional stability of the scanning object within the scanning area, and allowing the detector to collect accurate projection data. At the same time, the mating of the positioning protrusions and positioning holes allows the tray to be moved from one carrier to another along with the scanning object, facilitating the transfer of the tray on different support frames.

[0080] like Figures 3-4 As shown, according to an embodiment of this application, the plurality of positioning holes 45 may include: a central hole 450; a plurality of circumferential holes 451 distributed circumferentially along the central hole 450; wherein at least two positioning protrusions 46 include a first protrusion 460 that mates with the central hole 450, and at least one second protrusion 461 that mates with at least one circumferential hole 451.

[0081] The number of circumferential holes 451 can be two or more, for example, 2, 3, 4, 6, 8, 9, etc. The circumferential holes 451 can be evenly distributed circumferentially, and the circumferential angles corresponding to adjacent circumferential holes can be equal.

[0082] The number of second protrusions can be one or more, for example, 1, 2, 3, 4, 6, 8, 9, etc. If the number of second protrusions is two or more, the second protrusions can be evenly distributed circumferentially, and the circumferential angles corresponding to adjacent second protrusions can be equal.

[0083] The diameter of the central hole 450 can be slightly larger than that of the circumferential hole 451. Correspondingly, the diameter of the first protrusion 460 can be slightly larger than that of the second protrusion 461. This makes it easier, or more advantageous, to align the central hole 450 and the first protrusion 460.

[0084] The number of second protrusions 461 can be less than or equal to the number of circumferential holes 451. When the number of second protrusions 461 is equal to the number of circumferential holes 451, the circumferential angle corresponding to an adjacent second protrusion 461 can be equal to the degree measure of the circumferential angle corresponding to an adjacent circumferential hole. When the number of second protrusions 461 is less than the number of circumferential holes 451, the circumferential angle corresponding to an adjacent second protrusion 461 can be a multiple of the circumferential angle corresponding to an adjacent circumferential hole. For example, the circumferential angle corresponding to an adjacent second protrusion 461 can be twice the circumferential angle corresponding to an adjacent circumferential hole.

[0085] The circumferential holes 451 are distributed circumferentially along the central hole 450, allowing the tray and the carrier to fit at different angles, thereby adjusting the orientation of the scanned object on the carrier and enabling different parts to be irradiated by the X-ray beam.

[0086] The positioning holes of the carrier in the embodiments of this application are divided into a central hole and circumferentially distributed circumferential holes. The positioning protrusions include a first protrusion that mates with the central hole and a second protrusion that mates with the circumferential holes. The engagement of the central hole and the first protrusion enables the center positioning of the tray, while the engagement of the circumferential holes and the second protrusion restricts the circumferential rotation of the tray. The multiple circumferential holes allow the tray and the carrier to engage at different angles, thereby adjusting the orientation of the scanned object on the carrier and enabling different parts to be irradiated by the X-ray beam. This can improve the coverage and imaging angle diversity of the scanning detection, meet the defect detection needs of different parts and directions, and improve the comprehensiveness of detection and imaging accuracy.

[0087] According to an embodiment of this application, the scanning object can be placed on a carrier connected by different transmission mechanisms to pass through multiple linear scanning segments, including: the tray carrying the scanning object is transferred from its current carrier to another carrier connected by a transmission mechanism.

[0088] Different transmission mechanisms can correspond to different linear scanning segments, which can radiate different parts and directions of the scanned object. After the scanned object completes the scanning of one linear scanning segment, the next linear scanning segment can be performed. The tray carrying the scanned object can be transferred from its current carrier to a carrier connected to another transmission mechanism. The carriers of different transmission mechanisms can have the same positioning protrusions to cooperate with the tray. For example, the carrier of one transmission mechanism has three positioning protrusions 46, including one first protrusion 460 and two second protrusions 461. The carrier of another transmission mechanism also has three positioning protrusions 46, including one first protrusion 460 and two second protrusions 461.

[0089] For example, a tray carrying a scanned object can be transferred from its current location on a first carrier 41 to a second carrier 42 connected by another transmission mechanism.

[0090] The embodiments of this application can use the tray carrying the scanned object as a transfer unit to transfer it from the current carrier to another carrier through different linear scanning segments. This allows the scanned object to not directly contact the transfer and conveying device, avoiding contact interference with the scanned object during the transfer process. At the same time, the standardized structure of the tray makes it more adaptable to different carriers, ensuring the smooth transfer of the scanned object in multi-segment scanning and improving the overall detection efficiency.

[0091] According to an embodiment of this application, the tray carrying the scanned object can be engaged with at least two positioning protrusions in the carrier before and after the transfer through at least two positioning holes at the same position.

[0092] At least two positioning holes at the same location can define the orientation of the tray, that is, define the posture of the scanned object. Before and after transfer, the tray engages with the positioning protrusion through the same at least two positioning holes, which can ensure that the posture of the scanned object is the same on different carriers. This can eliminate the posture deviation of the scanned object caused by the difference in positioning during transfer, reduce the difficulty of CT image reconstruction, and improve the accuracy of imaging.

[0093] For example, before transfer, the tray 44 carrying the scanned object mates with two positioning protrusions on the carrier via a central hole 450 and a circumferential hole 451 at the same location. After transfer, the tray carrying the scanned object also mates with the two positioning protrusions on the carrier via the same central hole 450 and circumferential hole 451. Before transfer, the scanned object is placed horizontally with one end facing a preset direction, and after transfer, the scanned object also faces the same preset direction.

[0094] In the embodiments of this application, the tray carrying the scanned object is fitted with positioning protrusions on the carrier before and after transfer through positioning holes at the same position. The matching method of positioning holes and positioning protrusions at the same position allows the tray to maintain a consistent placement position and posture before and after transfer, eliminating the posture deviation of the scanned object caused by differences in positioning fit during the transfer process. This ensures that the angle and position of the scanned object being irradiated by the X-ray beam in different linear scan segments are uniform, allowing the projection data of multiple scans to be accurately connected, thereby improving the stitching and imaging accuracy of the final CT image.

[0095] According to embodiments of this application, the scanning object can maintain a consistent posture during the process of being placed on a carrier connected by different transmission mechanisms.

[0096] The orientation of the scanned object can include its orientation and angle in space, as well as its relative position to the pallet. By using the same positioning structure for the carriers connected to different transmission mechanisms and mates with the positioning holes on the same pallet, the pallet's own orientation remains unchanged during the transfer from one carrier to another. Furthermore, the same positioning and mating relationship ensures that the pallet's placement and orientation are consistent across different carriers, thus maintaining the same orientation of the scanned object during the transfer process.

[0097] The object being scanned, along with the tray carrying it, is transferred from its current location to another carrier connected by a transmission mechanism. The object is then fixed to the tray. Therefore, the relative position of the object and the tray can remain unchanged.

[0098] The tray and the carrier of different transmission mechanisms can adopt the same positioning structure. The tray carrying the scanned object can be matched with at least two positioning protrusions in the carrier before and after the transfer through at least two positioning holes at the same position, so that the orientation and angle of the scanned object in space remain unchanged.

[0099] In the embodiments of this application, the scanning object maintains a consistent posture during the transfer to different carriers. This consistency in posture allows the scanning object to maintain its expected spatial position relative to the X-ray source and detector in different linear scanning segments, reducing projection data deviations caused by posture changes. This enables the imaging device to easily integrate multi-segment scanning data, improving the accuracy of CT images. At the same time, there is no need to correct posture deviations, which simplifies the imaging process and improves imaging efficiency.

[0100] like Figure 2As shown, according to an embodiment of this application, the plurality of support frames may include: a first support frame 11, wherein a first conveying device among the plurality of conveying devices is disposed on the first support frame 11, and the horizontal path of the first annular conveying path 31 of the first conveying device forms a first straight scanning segment; and a second support frame 12, which is arranged in an L-shape with the first support frame 11, wherein a second conveying device among the plurality of conveying devices is disposed on the second support frame 12, and the vertical path of the second annular conveying path 32 of the second conveying device forms a second straight scanning segment, and the second straight scanning segment is perpendicular to the first straight scanning segment.

[0101] The first support frame 11 and the second support frame 12 are arranged in an L-shape, and horizontal and vertical paths are respectively set to form a straight scanning segment, which can realize ray scanning of the scanning object from two mutually perpendicular angles, horizontal and vertical.

[0102] For example, the first linear scanning segment can be equipped with a radiation source that emits a vertically oriented ray beam. As the object being scanned passes through the first linear scanning segment, the ray beam radiates vertically onto the object. The vertical scanning projection data is formed after the ray beam passes through the object.

[0103] The second linear scanning segment can be equipped with a source that emits a horizontally emitting X-ray beam. As the object being scanned passes through the second linear scanning segment, the X-ray beam radiates horizontally onto the object. The horizontal scanning projection data is then generated after the X-ray beam passes through the object.

[0104] In the embodiments of this application, the support frame is configured as a first support frame and a second support frame in an L-shaped layout, respectively equipped with a conveying device forming a first and a second straight scanning segment that are perpendicular to each other; the L-shaped layout allows the two straight scanning segments to form a vertical spatial relationship, enabling the scanning device to perform ray scanning on the object from two mutually perpendicular angles, horizontal and vertical, and to collect projection data in both horizontal and vertical dimensions. The projection data is more comprehensive, especially suitable for the local imaging needs of flat objects, and improves the restoration of the internal structure of the scanned object by CT images.

[0105] According to an embodiment of this application, the transmission mechanism in the first linear scanning segment can move along a first direction, and the transmission mechanism in the second linear scanning segment can move along a second direction. The conveying end of the transmission mechanism in the first linear scanning segment is close to the conveying starting end of the transmission mechanism in the second linear scanning segment, and the scanning object is transferred from the conveying end to the conveying starting end.

[0106] The first direction and the second direction can be different. The first direction can be the direction pointing towards the second straight line scan segment. For example, the first direction can be horizontal and pointing towards the second straight line scan segment. The second direction can be vertical, for example, vertically upward.

[0107] The transmission mechanism moves gradually in the first direction towards the second linear scanning segment. When the transmission mechanism approaches the end of the transport in the first linear scanning segment, the scanned object on the carrier connected to the transmission mechanism can be transferred from the end of the transport in the first linear scanning segment to the beginning of the transport in the second linear scanning segment.

[0108] The scanned object can be transferred together with the tray carrying it by a transfer device. For example, before the transfer, the scanned object can be positioned using at least two positioning points on the same location on the tray, which can engage with at least two positioning protrusions in the carrier before the transfer; and the scanned object can be positioned using at least two positioning holes on the same location on the tray, which can engage with at least two positioning protrusions in the carrier after the transfer, thus maintaining the orientation of the scanned object before and after the transfer.

[0109] In the embodiments of this application, the transmission mechanisms of the first and second linear scanning segments move in different directions. The end of the first linear scanning segment and the beginning of the second linear scanning segment approach each other, and the scanned object is transferred here. The proximity of the end of the transmission segment and the beginning of the second linear scanning segment can shorten the transfer path of the scanned object, reduce the transfer time, and improve the overall detection efficiency. At the same time, the movement in different directions allows the X-ray beam to irradiate the scanned object from different angles, and collects complementary projection data, which can improve the integrity of the scanned image.

[0110] like Figure 4 As shown, according to an embodiment of this application, a plurality of carrier seats may include: a first carrier seat 41 connected to a first transmission mechanism of a first conveying device, including: a first carrier plate 401; a first connecting plate 431, which is bent relative to the first carrier plate 401, with its first end connected to the first carrier plate 401 and its second end connected to the first transmission mechanism 21.

[0111] The bent, integrated structure of the first support plate 401 and the first connecting plate 431 enables the first support base 41 to form a stable overall structure, allowing the first support plate 401 to stably support the tray 44 and the scanning object. During the scanning process, the scanning object is less prone to deformation, shaking, or displacement, which helps to ensure the positioning accuracy and smooth movement of the scanning object.

[0112] The integrated connecting plate structure reduces the use of additional connectors and fasteners, lowers the number of parts and assembly complexity, improves assembly efficiency, and reduces cumulative errors. It also allows for more efficient use of the space in the first support frame for the bearing seat and the first conveying device.

[0113] The bending structure is easy to achieve through processes such as sheet metal stamping and bending, resulting in good processing consistency. This is beneficial for mass production and ensures dimensional accuracy, thereby improving the overall accuracy of the system.

[0114] The first support seat in this embodiment consists of a first support plate and a bent first connecting plate. The two ends of the connecting plate are respectively connected to the support plate and the first transmission mechanism. The bent connecting plate structure allows the first support plate and the transmission mechanism to form a suitable spatial connection relationship, which can realize the stable support of the support plate on the tray and the scanning object. It can also make the connection between the support seat and the first conveying device fit the structural layout of the support frame more closely, avoid interference between the support seat and the support frame during the movement of the circular conveying path, and improve the smoothness of the conveying process and the space utilization rate.

[0115] like Figure 2 As shown, according to an embodiment of this application, the first support frame 11 may include an intersecting first annular end face 112 and a first side face 111, and the first annular conveying path 31 is installed on the first side face 111. The bottom surface of the first bearing plate 401 is opposite to the first annular end face 112 during the first linear scanning segment, and one side of the first connecting plate 431 is opposite to the first side face 111.

[0116] The first support frame 11 includes an intersecting first annular end face 112 and a first side face 111. The first side face 111 can be a vertical surface of the first support frame 11, and the first annular end face 112 surrounds the first side face 111. The first annular end face 112 may intersect the first side face 111 at an angle. The first connecting plate 431 is bent relative to the first bearing plate 401. The first connecting plate 431 and the first bearing plate 401 may also form a certain bending angle. The angle between the first annular end face 112 and the first side face 111 may be the same as the angle between the first connecting plate 431 and the first bearing plate 401.

[0117] The first annular conveying path 31 (including the first transmission mechanism 21) is installed on the first side surface 111. The first connecting plate 431 is connected to the first transmission mechanism 21. The bottom surface of the first bearing plate 401 can be opposite to the first annular end face 112 during the first linear scanning segment. One side of the first connecting plate 431 can be opposite to the first side surface 111.

[0118] For example, the first annular end face 112 and the first side face 111 can be orthogonal, that is, the first annular end face 112 and the first side face 111 are perpendicular to each other. The first connecting plate 431 can also be perpendicular to the first support plate 401. This allows the first support plate 401 and the tray 44 to face upwards. This allows the first support plate 401 to stably support the tray and the scanning object. The first support base fits snugly with the first support frame, allowing the support base and the first conveying device to more effectively utilize the peripheral space of the first support frame for layout.

[0119] In the embodiments of this application, the first support frame is provided with a first annular end face and a first side face, the annular conveying path is installed on the side face, the bottom surface of the bearing plate is opposite to the annular end face, and one side of the connecting plate is opposite to the side face; the first bearing seat and the first support frame form a close spatial fit, which can improve the compactness of the overall structure. It can also limit the movement position and posture of the bearing seat in the linear scanning section, avoiding the bearing seat from shifting or shaking during transportation, and improving the positional accuracy of the scanned object in the scanning area.

[0120] Figure 5 A schematic diagram of the structure of the second support according to an embodiment of this application is shown.

[0121] like Figure 5 As shown, according to an embodiment of this application, a plurality of carrier seats 4 may include: a second carrier seat 42 connected to a second transmission mechanism 22 of a second conveying device, comprising: a second carrier plate 402; a bent portion 432, bent relative to the second carrier plate 402, the first end of the bent portion 432 being connected to the second carrier plate 402, and the second end being connected to a second connecting plate 433; and a second connecting plate 433, extending in the opposite direction to the second carrier plate 402, the first end of the second connecting plate 433 being connected to the second end of the bent portion 432, and the second end being connected to the second transmission mechanism 22.

[0122] The integrated bending structure of the second support plate 402 and the bending part 432 forms a stable overall structure for the second support base 42, enabling the second support plate 402 to stably support the tray 44 and the scanned object. During the scanning motion, deformation, shaking, or displacement is less likely to occur, which helps ensure the positioning accuracy and smooth movement of the scanned object.

[0123] The second connecting plate 433 and the second bearing plate 402 extend in opposite directions, which can reserve placement space for the tray 44 and the scanning object, and avoid interference between the tray 44 and the scanning object and the support frame during movement.

[0124] The integrated connecting plate structure reduces the use of additional connectors and fasteners, lowers the number of parts and assembly complexity, improves assembly efficiency, and reduces cumulative errors. It also allows for more efficient use of the space in the second support frame for the carrier and the second conveyor device.

[0125] The bending structure is easy to achieve through processes such as sheet metal stamping and bending, resulting in good processing consistency. This is beneficial for mass production and ensures dimensional accuracy, thereby improving the overall accuracy of the system.

[0126] In the embodiments of this application, the second carrier 42 is connected to the second transmission mechanism 22 through the structure of the second carrier plate 402, the bent part 432, and the second connecting plate 433, and the second connecting plate 433 extends in the opposite direction to the second carrier plate 402; so that the second carrier 42 can adapt to the spatial layout of the second support frame 12, and avoid interference between the tray 44 and the scanning object and the support frame during the movement; the integrated structure allows the second carrier plate 402 to stably support the tray 44 and the scanning object, reduce the structural deformation or positional displacement of the carrier during the movement of the circular conveying path, and improve the structural stability and smoothness of the conveying process.

[0127] like Figure 2 As shown, according to an embodiment of this application, the second support frame 12 may include an intersecting second annular end face 122 and a second side face 121. The second annular conveying path 32 is installed on the second side face 121. The side face of the second bearing plate 402 is opposite to the second annular end face 122 during the second linear scanning segment, and one side of the second connecting plate 433 is opposite to the second side face 121.

[0128] The second support frame 12 includes an intersecting second annular end face 122 and a second side face 121. The second side face 121 can be a vertical surface of the second support frame 12, and the second annular end face 122 surrounds the second side face 121. The second annular end face 122 and the second side face 121 intersect at an angle. The bent portion 432 and the second connecting plate 433 are bent relative to the second bearing plate 402. The second connecting plate 433 and the second bearing plate 402 extend in opposite directions, and the side faces of the second connecting plate 433 and the second bearing plate 402 can form an included angle. The included angle between the second annular end face 122 and the second side face 121 can be the same as this included angle.

[0129] The second annular conveying path 32 (including the second transmission mechanism 22) is installed on the second side surface 121. The second connecting plate 433 is connected to the second transmission mechanism 22. The side surface of the second bearing plate 402 can be opposite to the second annular end face 122 during the second linear scanning segment, and one side of the second connecting plate 433 can be opposite to the second side surface 121.

[0130] For example, the second annular end face 122 and the second side face 121 can be orthogonal, that is, the second annular end face 122 and the second side face 121 are perpendicular to each other. The second connecting plate 433 can also be perpendicular to the side face of the second support plate 402. This allows the second support plate 402 and the tray 44 to face upwards. This allows the second support plate 402 to stably support the tray 44 and the scanning object. The second support base 42 and the second support frame 12 are close to each other, which also allows the second support base 42 and the second conveying device to make more efficient use of the peripheral space of the second support frame for layout.

[0131] In the embodiments of this application, the second support frame is provided with a second annular end face and a second side face. The annular conveying path is installed on the second side face. The side face of the second bearing plate is opposite to the second annular end face, and the side face of the second connecting plate is opposite to the second side face. The second bearing seat can be closely fitted with the second support frame in the second linear scanning segment, which can limit the movement trajectory and posture of the bearing seat, improve the positional accuracy of the scanned object in the second scanning segment, and at the same time, the compact fitting layout can improve the space utilization of the equipment, making the L-shaped dual scanning segment structure more compact.

[0132] 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.

[0133] like Figure 2 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, the X-ray source 51 is preferably 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.

[0134] For example, the X-ray beam emitted by the X-ray source 51 can be respectively set to be perpendicular to the first linear scanning segment of the first annular transmission path 31 and the second linear scanning segment of the second annular transmission path 32. Since the bearing surface 400 is parallel to the direction of the first linear scanning segment when the bearing 4 passes through it, the X-ray beam emitted by the X-ray source in the first linear scanning segment is perpendicular to the bearing surface 400. Since the bearing surface 400 is perpendicular to the direction of the second linear scanning segment when the bearing 4 passes through it, the X-ray beam emitted by the X-ray source is also perpendicular to the second linear scanning segment. Therefore, the X-ray beam emitted by the X-ray source in the second linear scanning segment is parallel to the bearing surface 400.

[0135] In the embodiments of this application, the X-ray beam of the first linear scanning segment can be perpendicular to the bearing surface, and the X-ray beam of the second linear scanning segment can be parallel to the bearing surface. For the two X-ray beam irradiation angles perpendicular and parallel to the bearing surface, projection data of the internal structure of the scanned object in different dimensions can be obtained. Especially for flat-shaped scanned objects, detailed data in the thickness direction and planar direction can be obtained at the same time, making the coverage of projection data more comprehensive and improving the accuracy of CT images in restoring the internal structure of flat objects.

[0136] According to an embodiment of this application, when the scanned object passes through a first linear scanning segment, a first surface angle can be 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 can be 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.

[0137] 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.

[0138] In the first linear scanning segment, a first surface angle can be set between the detector's detection surface and the supporting surface to receive as much projection data as possible from the X-ray beam. For example, when the X-ray beam emitted by the X-ray source in the first linear scanning segment is perpendicular to the supporting surface, the first surface angle can be 0° to 30°, such as 1°, 5°, 10°, or any value within the above range.

[0139] In the second linear scanning segment, a second surface angle can be formed between the detector surface and the supporting surface to maximize the reception of projection data formed by the X-ray beam. For example, when the X-ray beam emitted by the X-ray source in the second linear scanning segment is parallel to the supporting surface, 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.

[0140] In the embodiments of this application, the detector surface and the bearing surface of the detector in the first linear scanning segment and the second linear scanning segment form different first surface angles and second surface angles. The different detector surface angles allow the detector to collect projection data from the angle that is compatible with the irradiation of the X-ray beam, thereby improving the efficiency and accuracy of the detector in receiving signals at a specific angle after the X-ray beam passes through the scanned object. This can reduce signal attenuation or deviation caused by mismatch in the detector surface angle and improve the quality of the projection data.

[0141] According to an embodiment of this application, the first face angle can be approximately 0°, and the second face angle can be approximately 90°.

[0142] 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 strike the detection surface perpendicularly, 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 strike the detection surface perpendicularly, achieving good X-ray signal reception in this scanning segment.

[0143] 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.

[0144] 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 bearing 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 projection data.

[0145] 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.

[0146] 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).

[0147] 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.

[0148] When the object being scanned passes through the first linear scanning segment, the orthographic projection area of ​​the object being scanned intersects at least partially with the orthographic projection area of ​​the first linear scanning segment, so that part or all of the object being scanned may be covered by the ray beam of the first linear scanning segment.

[0149] Mutually independent means that the two projection areas do not overlap on the projection plane and are in a separate state. When the object being scanned passes through the second linear scanning segment, the orthographic projection area of ​​the object and the orthographic projection area of ​​the second linear scanning segment are independent of each other. That is, the X-ray beam emitted from the X-ray source does not illuminate the object from a direction perpendicular to the orthographic projection area of ​​the second linear scanning segment. For example, when the object being scanned passes through the second linear scanning segment, the X-ray beam illuminates the object from its side, enabling multi-angle detection.

[0150] 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.

[0151] like Figure 2 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 process of the scanned object passing through the scanning area, the first radiation source 511 and the first detector 521 are located on opposite sides of the scanned object; 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 scanned object; and a second detector 522, opposite to the first detector 521, wherein, during the process of the scanned object passing through the scanning area, the second radiation source 512 and the second detector 522 are located on opposite sides of the scanned object.

[0152] The first radiation source 511 and the second radiation source 512 can be symmetrically distributed relative to the support or the object being scanned. For example, the first radiation source 511 and the first detector 521 can be located on one side near the second support frame 12, and the second radiation source 512 and the second detector 522 can be located on the other side near the second support frame 12. 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.

[0153] 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.

[0154] For example, annular guide rail pairs are mounted on the first support frame 11 (horizontal support frame) and the second support frame 12 (vertical support frame), respectively, and the horizontal and vertical support frames are connected by a connecting bracket 6. Each annular guide rail pair contains multiple sliders (transmission mechanisms), and horizontal sliding seats (bearing seats) and vertical sliding seats (bearing seats) are fixed on the sliders respectively. The horizontal and vertical sliding seats circulate along the annular guide rail pairs under the drive of their respective synchronous belts or chain drives.

[0155] The object to be inspected (scanned object) is placed on a pallet and can be transferred along with the pallet. There are two positioning pins (positioning protrusions) on both the horizontal and vertical sliding seats, and the pallet has a central positioning hole and multiple circumferential positioning holes. At the loading position, the pallet and the object to be inspected are placed together at a fixed angle on the horizontal sliding seat. After the pallet and the object move to the horizontal transfer position, they can be removed by a transfer robot or other loading / unloading structure (transfer device) and placed on the vertical sliding seat at the vertical transfer position. The object then moves with the vertical sliding seat to the unloading position, where it is unloaded by the unloading mechanism or robot.

[0156] One or two sets of X-ray sources and detectors are fixed on the horizontal and vertical support frames, respectively. The horizontal slide moves horizontally with the tray and the object being examined, passing through the vertical X-ray path, while the vertical slide moves vertically with the tray and the object being examined, passing through the horizontal X-ray path, thus completing two linear scans. Because there are positioning pins on the horizontal / vertical slides, the orientation of the object being examined remains unchanged after being transferred, so the two linear scans can be merged to form a complete CT image.

[0157] Each scanning device in the embodiments of this application may include a first X-ray source and a first detector, a second X-ray source and a second detector, which can simultaneously scan two areas of the object being scanned, improve the data acquisition efficiency within the same scanning segment, and allow the X-ray beam to penetrate from both sides of the object being scanned, thereby obtaining more structural information about the object being scanned and improving the system's ability to detect large-sized objects.

[0158] Figure 6 A schematic diagram of a battery cell according to an embodiment of this application is shown.

[0159] like Figure 6 As shown, according to an embodiment of this application, the scanning object includes a flat-shaped battery cell.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] The embodiments of this application have at least one support base and a ring conveyor path that enables continuous feeding, inspection and unloading of battery cells, adapting to the high-speed online inspection requirements in the battery cell production process.

[0165] 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.

[0166] 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.

[0167] The linear scanning CT imaging method includes: for any scanned object, driving the transmission mechanism of the transport device located therein to move along a circular transport path, wherein a carrier mounted on the transmission mechanism carries the scanned object, and the carrier can follow the transmission mechanism to move along the circular transport path to pass through linear scanning segments, wherein the scanned object can be placed on carriers connected by different transmission mechanisms to pass through multiple linear scanning segments; for any linear scanning segment, an X-ray source emits a X-ray beam to form a scanning area, and a detector detects the projection data formed after the X-ray beam passes through the scanned object as it passes through the scanning area, wherein multiple sets of scanning devices are respectively set in multiple linear scanning segments, each set of scanning devices including at least one X-ray source and at least one detector; and an imaging device generates a computed tomography image of the scanned object based on the multiple projection data detected by each detector in the multiple linear scanning segments.

[0168] 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.

[0169] The method described in this application uses a drive mechanism to move a transmission mechanism along a circular conveying path, allowing the carrier holding the scanned object to pass through multiple linear scanning segments. The scanned object can be placed on carriers connected by different transmission mechanisms to pass through multiple linear scanning segments sequentially. With the assistance of multiple scanning devices corresponding to each linear scanning segment, the X-ray source and detector synchronously acquire multiple sets of projection data of the object under different linear scanning segments. Finally, the imaging device fuses the data from multiple segments to generate a computed tomography (CT) image. This solution can achieve continuous and stable linear scanning, balancing the smoothness of the scanning motion with the comprehensiveness of data acquisition. It can improve imaging quality and scanning efficiency while ensuring the accuracy of the scanned object's posture and position, thus meeting the needs of efficient and high-precision online CT detection.

[0170] 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: Multiple support frames; Multiple conveying devices are respectively installed on the multiple support frames. Each conveying device includes a drive mechanism, a transmission mechanism, and a ring conveying path. The drive mechanism is configured to drive the transmission mechanism to move along the ring conveying path. The multiple ring conveying paths respectively form multiple straight scanning segments through local straight paths. Multiple carriers are configured to carry at least one scanned object. Each of the transmission mechanisms is connected to at least one carrier to drive the at least one carrier to move along a circular conveying path. The scanned object can be placed on carriers connected by different transmission mechanisms to pass through the multiple 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: At least one transfer device, wherein each of the transfer devices is configured to transfer a scanned object irradiated by a beam in one linear scan segment to another linear scan segment to receive beam irradiation.

3. The system according to claim 1 or 2, further comprising: At least one connecting bracket, wherein each of the connecting brackets is configured to connect adjacent support brackets to fix the relative position between adjacent support brackets.

4. The system according to claim 1, characterized in that, The support includes: The support portion is configured to define a support surface, wherein the support surface is provided with at least two positioning protrusions; A tray is disposed on the bearing surface, and the bottom of the tray has a plurality of positioning holes, wherein at least two positioning holes cooperate with at least two positioning protrusions, and the tray is configured to bear the scanning object; The third connecting part has its first end connected to the bearing part and its second end connected to the transmission mechanism.

5. The system according to claim 4, characterized in that, The plurality of positioning holes include: Center hole; Multiple circumferential holes are distributed circumferentially along the central hole; The at least two positioning protrusions include a first protrusion that mates with the central hole and at least one second protrusion that mates with at least one circumferential hole.

6. The system according to claim 4 or 5, characterized in that, The scanned object can be placed on a support seat connected by different transmission mechanisms to pass through the multiple linear scanning segments, including: The tray carrying the scanned object is transferred from its current carrier to another carrier connected by a transmission mechanism.

7. The system according to claim 6, characterized in that, The tray carrying the scanned object engages with at least two positioning protrusions in the carrier before and after the transfer via at least two positioning holes at the same position.

8. The system according to claim 6, characterized in that, The scanning object maintains a consistent posture while being placed on a support seat connected by different transmission mechanisms.

9. The system according to claim 4, characterized in that, The plurality of support frames include: A first support frame, wherein a first conveying device among the plurality of conveying devices is disposed on the first support frame, and the horizontal path of the first annular conveying path of the first conveying device forms a first straight scanning segment; The second support frame is arranged in an L-shape with the first support frame. The second conveying device among the plurality of conveying devices is disposed on the second support frame. The vertical path of the second annular conveying path of the second conveying device forms a second straight scanning segment, which is perpendicular to the first straight scanning segment.

10. The system according to claim 9, characterized in that, In the first linear scanning segment, the transmission mechanism moves along a first direction; in the second linear scanning segment, the transmission mechanism moves along a second direction. The end of the transmission mechanism in the first linear scanning segment is close to the beginning of the transmission mechanism in the second linear scanning segment, and the scanning object is transferred from the end of the transmission mechanism to the beginning of the transmission mechanism.

11. The system according to claim 9, characterized in that, The plurality of bearing seats include: The first support base connected to the first transmission mechanism of the first conveying device includes: First load-bearing plate; The first connecting plate is bent relative to the first bearing plate, with its first end connected to the first bearing plate and its second end connected to the first transmission mechanism.

12. The system according to claim 11, characterized in that, The first support frame includes an intersecting first annular end face and a first side face, and a first annular conveying path is installed on the first side face. In this configuration, the bottom surface of the first bearing plate is opposite to the first annular end face during the first linear scanning segment, and one side of the first connecting plate is opposite to the first side surface.

13. The system according to claim 9, characterized in that, The plurality of bearing seats include: The second support base, connected to the second transmission mechanism of the second conveying device, includes: Second bearing plate; The bending portion is bent relative to the second bearing plate, with the first end of the bending portion connected to the second bearing plate and the second end connected to the second connecting plate; The second connecting plate extends in the opposite direction to the second bearing plate. The first end of the second connecting plate is connected to the second end of the bent portion, and the second end is connected to the second transmission mechanism.

14. The system according to claim 13, characterized in that, The second support frame includes intersecting second annular end faces and second side faces, with a second annular conveying path installed on the second side face. In this configuration, the side of the second carrier plate is opposite to the second annular end face during the second linear scanning segment, and one side of the second connecting plate is opposite to the second side.

15. The system according to claim 9, 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.

16. The system according to claim 9 or 15, 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.

17. The system as claimed in claim 16, characterized in that, The first face has an angle of approximately 0°, and the second face has an angle of approximately 90°.

18. The system according to claim 9 or 15, 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.

19. 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.

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

21. A linear scanning CT imaging method applied to the system of any one of claims 1 to 20, comprising: For any scanned object, the drive mechanism of the conveying device drives the transmission mechanism to move along the circular conveying path. The carrier mounted on the transmission mechanism carries the scanned object. The carrier can follow the transmission mechanism to move along the circular conveying path to pass through the linear scanning segment. The scanned object can be placed on carriers connected by different transmission mechanisms to pass through multiple linear scanning segments. For any straight-line scanning segment, the X-ray source emits a X-ray beam 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, and 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.

Images