CT device
By incorporating multi-point contact axial and eccentric pressure roller groups in CT equipment, the vibration problem during high-speed rotation was solved, ensuring improved imaging accuracy and equipment lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NUCTECH CO LTD
- Filing Date
- 2023-12-28
- Publication Date
- 2026-06-12
Smart Images
Figure CN117805151B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of radiation inspection technology, and more specifically, to a CT device. Background Technology
[0002] CT technology plays a vital role in security inspections because it can eliminate the effects of overlapping objects. CT equipment is also widely used in technical fields such as item inspection; it can inspect not only smaller items such as baggage and flight cases, but also larger items such as containers and vehicles.
[0003] In related technologies, CT equipment uses a slip ring device to acquire projection data from different angles by rotating the X-ray machine and detector. This data is then reconstructed to obtain tomographic images, thus revealing internal information about the baggage being inspected. Combined with dual-energy or multi-energy imaging technology, current baggage inspection equipment can reconstruct the atomic number and electron density of the inspected substances, thereby identifying the types of materials. This has proven highly effective in detecting explosives, dangerous goods, and other hazardous materials.
[0004] For example, in related technologies, when the rotatable part of a CT device is supported by a support device, the rotatable part will generate displacement along the rotation axis when it rotates. When the displacement is large and the rotation speed of the rotatable part is fast, it will cause the CT device to vibrate, which will affect the imaging accuracy of the CT device.
[0005] The information disclosed in this section is only for understanding the background of the disclosed concept, and therefore may contain information that does not constitute prior art. Summary of the Invention
[0006] In view of at least one of the above-mentioned technical problems, this disclosure provides a CT device.
[0007] One aspect of this disclosure provides a CT device, comprising: a gantry; a support device mounted on the gantry, the support device including a plurality of rotating wheels, wherein at least one rotating wheel of the support device serves as a drive wheel; a rotatable part, the rotatable part being rotatable about a rotation axis under the drive of the drive wheel, wherein the rotatable part is supported by the plurality of support devices during rotation; a scanning device mounted on the rotatable part, the scanning device being used to scan an object to be examined; and an axial limiting mechanism including a first pressure roller group and a second pressure roller group, the first pressure roller group and the second pressure roller group being respectively disposed on both end faces of the rotatable part along the rotation axis direction, wherein each of the first pressure roller group and the second pressure roller group includes n pressure rollers, n being an integer greater than 3, and at least a portion of the outer peripheral surface of any pressure roller contacts the end face of the rotatable part for limiting the movement of the rotatable part along the rotation axis direction.
[0008] In some exemplary embodiments of this disclosure, one of the first pressure roller group and the second pressure roller group includes an eccentric pressure roller group, and the other of the first pressure roller group and the second pressure roller group includes an axial pressure roller group; or, both the first pressure roller group and the second pressure roller group are axial pressure roller groups; or, both the first pressure roller group and the second pressure roller group are eccentric pressure roller groups.
[0009] In some exemplary embodiments of this disclosure, in the direction parallel to the rotation axis, the rotatable part sequentially includes a first rotation track, a rotatable part body and a second rotation track. In the direction parallel to the rotation axis, a first pressure roller group is disposed on the side of the first rotation track away from the rotatable part body, and a second pressure roller group is disposed on the side of the second rotation track away from the rotatable part body.
[0010] In some exemplary embodiments of this disclosure, both the axial pressure roller assembly and the eccentric pressure roller assembly include: a fixed seat, a connecting rod, a first bearing, a rotating shaft, a wheel seat, a wheel axle, a second bearing, a first pressure roller element, and a second pressure roller element. The fixed seat is fixedly connected to the frame, the outer ring of the first bearing is fixed on the fixed seat, the rotating shaft is fixedly connected to the inner ring of the first bearing, the connecting rod is disposed on the rotating shaft, the wheel seat is disposed at both ends of the connecting rod, at each end of the connecting rod, the wheel axle is fixed on the wheel seat, the first pressure roller element is disposed on the wheel axle through the second bearing, and the second pressure roller element is disposed on the wheel axle through the second bearing.
[0011] In some exemplary embodiments of this disclosure, the first pressure roller element and the second pressure roller element are arranged symmetrically about the center of the rotatable portion on the connecting rod.
[0012] In some exemplary embodiments of this disclosure, the mounting base has two screw holes symmetrically positioned on each side of the center of the rotatable part, and the mounting base is fixedly connected to the frame by mounting bolts installed in the two screw holes.
[0013] In some exemplary embodiments of this disclosure, in the axial pressure roller assembly, each of the first pressure roller element and the second pressure roller element includes at least two axial pressure rollers stacked sequentially along the wheel axis direction.
[0014] In some exemplary embodiments of this disclosure, in the axial pressure roller assembly, the central axes of the first pressure roller element and the second pressure roller element both coincide with the central axis of the wheel axle. The first pressure roller element and the second pressure roller element rotate on the wheel axle, and the minimum distance 'a' between at least a portion of the outer circumferential surface of any axial pressure roller and the end face of any rotating track along the direction of the rotation axis remains unchanged.
[0015] In some exemplary embodiments of this disclosure, in the eccentric pressure roller assembly, each of the first pressure roller element and the second pressure roller element includes at least two eccentric pressure rollers stacked sequentially along the wheel axis direction.
[0016] In some exemplary embodiments of this disclosure, in the eccentric pressure roller assembly, the wheel axle is an eccentric shaft, the central axes of the first pressure roller element and the second pressure roller element do not coincide with the central axis of the wheel axle, the first pressure roller element and the second pressure roller element rotate eccentrically on the wheel axle, and the minimum distance b between at least a portion of the outer circumferential surface of any eccentric pressure roller and the end face of any rotating track along the rotation axis direction varies.
[0017] In some exemplary embodiments of this disclosure, the minimum distance a and the minimum distance b together adjust the movement of the rotatable part along the rotation axis.
[0018] In some exemplary embodiments of this disclosure, in the eccentric pressure roller assembly, the rotating shaft is configured as an eccentric rotating shaft, the rotating shaft is fixed to the inner ring of the first bearing, the inner ring of the first bearing cooperates with the eccentric rotating shaft to cause the connecting rod to rotate eccentrically, and each of the first pressure roller element and the second pressure roller element includes at least two axial pressure rollers stacked sequentially along the wheel axis direction.
[0019] In some exemplary embodiments of this disclosure, the eccentric pressure roller assembly further includes: a fixed seat with pre-set elongated holes on both sides of the center of the rotatable part along the rotation axis, and the fixed seat is capable of moving along the elongated holes.
[0020] In some exemplary embodiments of this disclosure, the surface of either the first pressure roller element or the second pressure roller element is a cylindrical surface.
[0021] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description
[0022] To better understand this disclosure, it will be described in detail with reference to the following figures:
[0023] Figure 1 This is a front view of a CT device according to some exemplary embodiments of the present disclosure;
[0024] Figure 2 This is a side view of a CT device according to some exemplary embodiments of the present disclosure;
[0025] Figure 3 This is a front view of a rotatable portion of a CT device according to some exemplary embodiments of the present disclosure;
[0026] Figure 4 This is a side view of a rotatable portion of a CT device according to some exemplary embodiments of the present disclosure;
[0027] Figure 5A This is a schematic diagram of the axial pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure;
[0028] Figure 5B This is a schematic diagram of the structure of the axial pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure, cut along the AA direction of the connecting rod center axis;
[0029] Figure 5C This is a partial structural schematic diagram of the pressure roller element in the axial pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure;
[0030] Figure 6A This is a schematic diagram of the structure of the eccentric pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure;
[0031] Figure 6B This is a partial structural schematic diagram of the pressure roller element in the eccentric pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure;
[0032] Figure 7 This is a partial structural schematic diagram of the connection between the fixed base and the frame in another eccentric pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure;
[0033] Figure 8 This is a schematic diagram of the structure of the magnetic device of a CT apparatus according to another exemplary embodiment of the present disclosure. Detailed Implementation
[0034] Specific embodiments of this disclosure will now be described in detail. It should be noted that the embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this disclosure. In the following description, numerous specific details are set forth in order to provide a thorough understanding of this disclosure. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement this disclosure. In other instances, well-known structures, materials, or methods have not been specifically described to avoid obscuring this disclosure.
[0035] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of this disclosure. Therefore, the phrases "in an embodiment," "in an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. 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.
[0037] 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.
[0038] In related technologies, when the rotatable part of a CT device is supported by a support device, the rotatable part will generate displacement along the rotation axis when it rotates. When the displacement is large and the rotation speed of the rotatable part is fast, it will cause the CT device to vibrate, which will affect the imaging accuracy of the CT device.
[0039] To address these issues, existing distributed bearing CT equipment employs two sets of fixed axial pressure rollers as axial constraints for the imaging system during high-speed rotation. The existing axial limiting structure is fixed. To ensure both sets of pressure rollers contact the imaging system's end face, high machining precision is required. This includes the flatness of the imaging system's end face, the positional accuracy of the radial support rollers, and the cylindricity of the axial support rollers. While controlling these parameters improves wheel-rail contact, it increases manufacturing costs, and in most cases, it still cannot guarantee simultaneous contact between both roller sets and the imaging system's end face; the axial pressure rollers only make single-point contact with the imaging system's end face. This single-point contact at the imaging system's end face during high-speed rotation causes the following problems: it causes a change in the rotation center position, exacerbating wobbling; and it leads to faster wear of the polymer material rollers.
[0040] In view of this, embodiments of the present disclosure provide a CT device, wherein the device includes: a frame; a support device disposed on the frame, the support device including a plurality of rotating wheels, wherein at least one rotating wheel of the support device serves as a drive wheel; a rotatable part, the rotatable part being able to rotate around a rotation axis under the drive of the drive wheel, the rotatable part being supported by the plurality of support devices during rotation; a scanning device disposed on the rotatable part, the scanning device being used to scan the object to be examined; an axial limiting mechanism including a first pressure roller group and a second pressure roller group, the two pressure roller groups being disposed on the two end faces of the rotatable part along the rotation axis direction, wherein each of the first pressure roller group and the second pressure roller group includes n pressure rollers, n being an integer greater than 3, at least a portion of the outer peripheral surface of any pressure roller contacting the end face of the rotatable part, for limiting the movement of the rotatable part along the rotation axis direction.
[0041] During high-speed rotation imaging, the rotatable part will experience displacement along the rotation axis. Multiple pressure rollers in the first and second pressure roller groups, respectively located on both ends of the rotatable part, will form multi-point contact with the rotation track within the rotatable part. It should be noted that, to avoid faster wear of the pressure rollers due to single-point contact, each of the first and second pressure roller groups includes at least three pressure rollers. In this case, the first and second pressure roller groups can collaboratively adjust the displacement of the rotatable part to limit its sway.
[0042] Through the embodiments of this disclosure, it can be effectively ensured that both sides of the axial end face of the rotatable part can form multi-point contact with multiple pressure rollers in the pressure roller assembly, reducing the wear of individual pressure rollers and also helping to reduce the operating noise of the equipment. In addition, it also ensures the positional stability of the rotatable part, making the CT equipment imaging accurate and improving the equipment's lifespan.
[0043] Figure 1 This is a front view of a CT device according to some exemplary embodiments of the present disclosure. Figure 2 This is a side view of a CT device according to some exemplary embodiments of the present disclosure. Figure 3 This is a front view of a rotatable portion of a CT device according to some exemplary embodiments of the present disclosure. Figure 4 This is a side view of a rotatable portion of a CT device according to some exemplary embodiments of the present disclosure.
[0044] The following is combined Figures 1 to 4 The CT device according to embodiments of the present disclosure will be described in detail.
[0045] like Figures 1 to 4 As shown, the CT equipment 100 includes a frame 110, a support device 1, a rotatable part 2, a scanning device 3, and an axial limiting mechanism, including a first pressure roller group 4 and a second pressure roller group 5.
[0046] The frame 110 is used to support the CT equipment 100. Support devices 1 are mounted on the frame 110. Multiple support devices 1 can be provided; for example, two can be arranged opposite each other on a first side near the lower side of the frame, and two can be arranged opposite each other on a second side near the lower side of the frame opposite the first side. The support devices 1 are used to support the rotatable part 2.
[0047] The support device 1 includes a plurality of rotatable wheels 11, wherein at least one rotatable wheel 11 of at least one support device 1 serves as a drive wheel. For example, as Figure 1 One of the rotatable wheels 11 of the support device 1 is connected to the drive motor, and the rotatable wheel 11 serves as the drive wheel.
[0048] The rotatable part 2 can rotate around the rotation axis AX1 under the drive of the drive wheel. During the rotation of the rotatable part 2, the rotatable part 2 is supported by multiple support devices 1.
[0049] like Figure 3 and Figure 4 As shown, the scanning device 3 includes a radiation source 31 and a detector 32. Both the radiation source 31 and the detector 32 are mounted on the rotatable part 2 and are arranged opposite each other along the radial direction of the rotatable part 2. For example, the radiation source 31 is located on one side of the rotatable part, and the detector 32 is located on the second side opposite to the first side. The center of gravity of the radiation source 31 and the detector 32 is located on the rotation axis AX1, thereby ensuring that no vibration occurs when the rotatable part drives the radiation source 31 and the detector 32 to rotate.
[0050] like Figure 2 As shown, the rotatable part 2, in the direction parallel to the rotation axis AX1, sequentially includes a first rotating track 21, a rotatable part body 22, and a second rotating track 21'. The rotatable part body 22 is sandwiched between the two rotatable tracks, and the scanning device 3 is mounted on the rotatable part body 22. In the direction parallel to the rotation axis AX1, a first pressure roller group 4 and a second pressure roller group 5 are respectively provided on the two end faces of the rotatable part 2.
[0051] When the rotatable part 2 of the CT equipment is supported by multiple support devices 1, the rotatable part 2 can rotate around the rotation axis under the drive of the drive wheel. During the high-speed rotation imaging process of the rotatable part 2, the rotatable part 2 will generate displacement along the rotation axis, and the CT equipment will vibrate.
[0052] At this time, multiple pressure rollers on the first pressure roller group 4 contact the first rotation track 21 of the rotatable part 2, thereby restricting the movement of the rotatable part 2 along the first direction D1. Multiple pressure rollers on the second pressure roller group 5 contact the second rotation track 21' of the rotatable part 2, thereby restricting the movement of the rotatable part 2 along the second direction D2. Figure 2 As shown, both the first direction D1 and the second direction D2 are parallel to the rotation axis AX1, and the first direction D1 and the second direction D2 are opposite. This ensures that the rotatable part 2 remains stable during high-speed rotation and reduces wobbling.
[0053] In some exemplary embodiments of this disclosure, one of the first pressure roller group and the second pressure roller group includes a set of eccentric pressure roller groups, and the other includes a set of axial pressure roller groups. For example, the first pressure roller group 4 is an eccentric pressure roller group, and the second pressure roller group 5 is an axial pressure roller group, or the first pressure roller group 4 is an axial pressure roller group, and the second pressure roller group 5 is an eccentric pressure roller group.
[0054] At this time, the two sets of pressure rollers are positioned as follows, for example, as shown in the diagram. Figure 2As shown, in a direction parallel to the rotation axis AX1, the first pressure roller group 4 (e.g., axial pressure roller group) is disposed on the side of the first rotating track 21 away from the rotatable part body 22, and the second pressure roller group 5 (e.g., eccentric pressure roller group) is disposed on the side of the second rotating track 21' away from the rotatable part body 22.
[0055] In other embodiments, the first pressure roller group and the second pressure roller group may both be eccentric pressure roller groups or both be axial pressure roller groups.
[0056] The following is combined Figures 5A to 6B The embodiments of the present disclosure provide a detailed description of the implementation of a set of axial pressure rollers and a set of eccentric pressure rollers arranged on the two end faces of the rotatable part of the CT device.
[0057] Figure 5A This is a schematic diagram of the axial pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure. Figure 5B This is a schematic diagram of the structure of the axial pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure, cut along the AA direction of the connecting rod central axis. Figure 5C This is a partial structural schematic diagram of the pressure roller element in the axial pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure.
[0058] like Figures 5A to 5C As shown, the first pressure roller group 4 (e.g., axial pressure roller group) includes: a fixed seat 221, a connecting rod 222, a first bearing 223, a rotating shaft 224, a wheel seat 225, a wheel axle 226, a second bearing 227, a first pressure roller element 228, and a second pressure roller element 229.
[0059] The fixed base 221 is fixedly connected to the frame 110. The outer ring of the first bearing 223 is fixed on the fixed base 221. The rotating shaft 224 is fixed on the inner ring of the first bearing 223. The connecting rod 222 is set on the rotating shaft 224.
[0060] Wheel seats 225 are mounted on both ends of connecting rod 222. At each end of connecting rod 222, wheel axle 226 is fixed on wheel seat 225. First pressure roller element 228 is mounted on wheel axle 226 via second bearing 227, and second pressure roller element 229 is mounted on wheel axle 226 via second bearing 227.
[0061] During the rotation of the rotatable part, when the rotatable part generates displacement along the rotation axis, the rotation track in the rotatable part will contact the axial pressure rollers on the first pressure roller element and the second pressure roller element in the axial pressure roller group and generate thrust, so that the first pressure roller element and the second pressure roller element will rotate around the central axis of the connecting rod in a plane parallel to the rotation axis, thereby adaptively adjusting the displacement of the rotatable part and limiting the swaying of the rotatable part.
[0062] Please continue to refer to Figure 5A The first pressure roller element 228 and the second pressure roller element 229 are arranged symmetrically on the connecting rod about the center of the rotatable part.
[0063] In the axial pressure roller assembly, by symmetrically arranging the first pressure roller element and the second pressure roller element at both ends of the connecting rod, the connecting rod is kept to rotate around its central axis, thereby adaptively adjusting the displacement of the rotatable part.
[0064] like Figure 5C As shown, in the axial pressure roller assembly, each of the first pressure roller element 228 and the second pressure roller element 229 includes at least two axial pressure rollers 230 stacked sequentially along the wheel axis direction.
[0065] For example, the surface of either the first pressure roller element 228 or the second pressure roller element 229 can be a cylindrical surface.
[0066] It should be noted that in the axial pressure roller assembly, the central axes of the first pressure roller element 228 and the second pressure roller element 229 are both coincident with the central axis of the wheel axle 226. The first pressure roller element 228 and the second pressure roller element 229 rotate on the wheel axle 226, and the minimum distance 'a' between at least a portion of the outer circumferential surface of any axial pressure roller 230 and the end face of any rotating track along the rotation axis remains unchanged.
[0067] Understandably, when the rotatable part undergoes displacement along the axis of rotation during rotation, the rotating track will contact the axial pressure wheel and generate thrust, causing the axial pressure wheel to rotate around its axle, thereby causing the connecting rod to rotate around its central axis. At this time, the minimum distance between the outer circumferential surface of either pressure wheel at both ends of the connecting rod and the rotating track is the same.
[0068] In some exemplary embodiments of this disclosure, please refer to Figure 5A As shown, the mounting base 221 has two screw holes symmetrically set on each side of the center of the rotatable part 2. The mounting base 221 is fixedly connected to the frame 110 by mounting bolts 2210 installed in the two screw holes.
[0069] Figure 6A This is a schematic diagram of the structure of the eccentric pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure. Figure 6B This is a partial structural schematic diagram of the pressure roller element in the eccentric pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure.
[0070] like Figure 6A and Figure 6B As shown, the second pressure roller assembly 5 (e.g., eccentric pressure roller assembly) includes: a fixed base 221, a connecting rod 222, a first bearing 223, a rotating shaft 224, a wheel seat 225, a wheel axle 226, a second bearing 227, a first pressure roller element 228', and a second pressure roller element 229'.
[0071] The fixed base 221 is fixedly connected to the frame 110. The outer ring of the first bearing 223 is fixed on the fixed base 221. The rotating shaft 224 is fixed on the inner ring of the first bearing 223. The connecting rod 222 is set on the rotating shaft 224. The inner ring of the first bearing 223 cooperates with the rotating shaft 224 to make the connecting rod 222 rotate.
[0072] Wheel seats 225 are mounted on both ends of connecting rod 222. At each end of connecting rod 222, wheel axle 226 is fixed on wheel seat 225. First pressure roller element 228' is mounted on wheel axle 226 via second bearing 227, and second pressure roller element 229' is mounted on wheel axle 226 via second bearing 227.
[0073] Please continue to refer to Figure 6A The first pressure roller element 228' and the second pressure roller element 229' are arranged symmetrically about the center of the rotatable part on the connecting rod.
[0074] Please continue to refer to Figure 6B In the eccentric pressure roller assembly, each of the first pressure roller element 228' and the second pressure roller element 229' includes at least two eccentric pressure rollers 230' stacked sequentially along the wheel axis direction.
[0075] That is, in the eccentric pressure roller assembly, since the wheel axle 226 is an eccentric shaft, the central axes of the first pressure roller element 228' and the second pressure roller element 229' do not coincide with the central axis of the wheel axle 226, and the eccentric pressure rollers 230' on the first pressure roller element 228' and the second pressure roller element 229' rotate eccentrically on the wheel axle 226.
[0076] Understandably, when the rotatable part undergoes displacement along the axis of rotation during rotation, the rotating track comes into contact with the eccentric pressure wheel and generates thrust, causing the eccentric pressure wheel to begin rotating. This causes the connecting rod to rotate around its central axis in a plane parallel to the axis of rotation. However, since the axle is eccentric, the eccentric pressure wheel does not rotate around the axle but instead undergoes eccentric motion under the action of the thrust. Therefore, the minimum distance b between at least a portion of the outer circumferential surface of any eccentric pressure wheel and the end face of any rotating track along the axis of rotation varies.
[0077] In the CT device of this embodiment, by arranging a set of axial pressure rollers and a set of eccentric pressure rollers on the two end faces of the rotatable part, when the rotatable part generates displacement along the rotation axis during rotation, the rotating track will contact the pressure rollers in the two pressure roller sets, causing the eccentric pressure roller sets and the axial pressure roller sets to rotate around the connecting rod. At this time, the minimum distance 'a' between at least a portion of the outer circumferential surface of the axial pressure roller and the end face of any rotating track along the rotation axis, and the minimum distance 'b' between at least a portion of the outer circumferential surface of any eccentric pressure roller and the end face of any rotating track along the rotation axis, together adjust and limit the movement displacement of the rotatable part along the rotation axis. This effectively ensures that both sides of the axial end face of the rotatable part can contact the pressure roller sets at multiple points, ensuring the uniqueness of the rotatable part's position, making the CT device's imaging accurate, improving the device's lifespan, and also helping to reduce the device's operating noise.
[0078] In other embodiments, the rotating shaft in the eccentric pressure roller assembly is set as an eccentric shaft, as detailed below.
[0079] The eccentric pressure roller assembly also includes: a rotating shaft 224 configured as an eccentric rotating shaft, the rotating shaft 224 being fixed to the inner ring of the first bearing 223, the inner ring of the first bearing 223 cooperating with the eccentric rotating shaft to cause the connecting rod to rotate eccentrically, wheel seats 225 being disposed at both ends of the connecting rod 222, and at each end of the connecting rod 222, a wheel axle 226 being fixed to the wheel seat 225, a first pressure roller element 228' being disposed on the wheel axle 226 via a second bearing 227, and a second pressure roller element 229' being disposed on the wheel axle 226 via a second bearing 227.
[0080] It should be noted that, at this time, each of the first pressure roller element 228' and the second pressure roller element 229' includes at least two axial pressure rollers 230 stacked sequentially along the wheel axis direction.
[0081] It is understandable that when the rotating shaft in the eccentric pressure roller assembly is set as an eccentric shaft, and the rotatable part generates displacement along the direction of the rotation axis during rotation, the rotating track will contact the axial pressure roller and generate thrust, causing the connecting rod to rotate eccentrically in a plane parallel to the rotation axis. At this time, the minimum distance b' between at least a part of the outer circumferential surface of any axial pressure roller and the end face of any rotating track along the direction of the rotation axis varies.
[0082] By using the embodiments of this disclosure, the rotating shaft in the eccentric pressure roller assembly is set as an eccentric shaft, and the distance between it and the axial pressure roller assembly can be adjusted, thereby effectively limiting the movement displacement of the rotatable part along the rotation axis.
[0083] In other embodiments, another specific implementation of the eccentric pressure roller assembly is as follows.
[0084] Figure 7This is a partial structural diagram of the connection between the fixed base and the frame in another eccentric pressure roller assembly of a CT device according to some exemplary embodiments of the present disclosure.
[0085] Combination Figure 5A and Figure 7 As shown, the outer ring of the first bearing 223 is fixed on the fixed seat 221, the rotating shaft 224 is fixed on the inner ring of the first bearing 223, and the connecting rod 222 is mounted on the rotating shaft 224. The inner ring of the first bearing 223 cooperates with the rotating shaft 224 to make the connecting rod 222 rotate. The fixed seat 221 is fixedly connected to the frame 110 in such a way that the fixed seat 221 has pre-set elongated holes 2220 on both sides of the center of the rotatable part along the rotation axis. By installing bolts 2210, the fixed seat 221 can move along the elongated holes 2220.
[0086] It should be noted that, at this time, each pressure roller element includes at least two axial pressure rollers stacked sequentially along the wheel axis.
[0087] It is understandable that when the rotatable part generates displacement along the rotation axis during rotation, the rotating track will contact the axial pressure roller and generate thrust. The eccentric pressure roller group will move along the rotation axis along the preset mounting elongated hole with the fixed seat. At this time, the distance between the eccentric pressure roller group and the axial pressure roller group can be adjusted to effectively limit the movement displacement of the rotatable part along the rotation axis.
[0088] According to embodiments of this disclosure, during the operation of the CT equipment, a set of adaptive rollers is respectively installed on both ends of the imaging system to ensure that both sides of the axial end face of the imaging system can make multi-point contact with the pressure rollers, thus guaranteeing the unique position of the imaging system. This improves imaging accuracy, extends the lifespan of the CT equipment, and also helps reduce operating noise.
[0089] Figure 8 This is a schematic diagram of the structure of the magnetic device of a CT apparatus according to another exemplary embodiment of the present disclosure.
[0090] like Figure 8 As shown, the CT device 100 also includes a magnetic device 6, which is disposed on the frame 110 and is used to provide magnetic attraction to the rotatable part 2 when the rotatable part 2 rotates, so as to apply an attraction force to the rotatable part 2 toward the frame 110.
[0091] For example, the magnetic device 6 includes a plurality of permanent magnets or electromagnets, which are arranged on the frame at intervals from each other along the rotation direction of the rotatable part 2.
[0092] For example, multiple permanent magnets or electromagnets are arranged at uniform intervals on the frame along the rotation direction of the rotatable part. For instance, multiple permanent magnets are arranged on the frame along the outer circumference of the rotating part, and can be arranged in the lower region of the frame or in other regions of the frame.
[0093] like Figure 3 and Figure 4 As shown, the rotatable part 2 includes a rotatable part body 22 and two rotatable tracks. The scanning device 3 is disposed on the rotatable part body 22. In some embodiments, the rotatable tracks include a magnetic material. In some optional embodiments, a magnetic part made of magnetic material is mounted on the outer peripheral surface of the rotatable tracks. This magnetic part can attract each other with the magnetic device, thereby applying an attractive force to the rotatable part 2 toward the frame 110.
[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0095] Although embodiments of the present disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents. Those skilled in the art will understand that the features recited in the various embodiments and / or claims of the present disclosure can be combined or combined in various ways, even if such combinations or combinations are not expressly stated in the present disclosure. In particular, the features recited in the various embodiments and / or claims of the present disclosure can be combined and / or combined in various ways without departing from the spirit and teachings of the present disclosure. All such combinations and / or combinations fall within the scope of the present disclosure.
Claims
1. A CT scanner, characterized in that, include: frame; A support device is mounted on the frame, the support device including a plurality of rotating wheels, wherein at least one rotating wheel of the support device serves as a drive wheel; A rotatable part, which is capable of rotating around a rotation axis under the drive of the drive wheel, and during the rotation of the rotatable part, the rotatable part is supported by a plurality of the support devices; A scanning device is disposed on the rotatable part, and the scanning device is used to scan the item to be inspected; The axial limiting mechanism includes a first pressure roller group and a second pressure roller group, which are respectively disposed on the two end faces of the rotatable part along the rotation axis. Each of the first pressure roller group and the second pressure roller group includes n pressure rollers, where n is an integer greater than 3. At least a portion of the outer peripheral surface of any of the pressure rollers contacts the end face of the rotatable part to limit the movement of the rotatable part along the rotation axis. Both the first pressure roller assembly and the second pressure roller assembly include: a fixed base, a connecting rod, a first bearing, a rotating shaft, a wheel seat, a wheel axle, a second bearing, a first pressure roller element, and a second pressure roller element. The fixed base is fixedly connected to the frame, the outer ring of the first bearing is fixed to the fixed base, the rotating shaft is fixedly connected to the inner ring of the first bearing, and the connecting rod is disposed on the rotating shaft. The wheel seat is disposed on both ends of the connecting rod. At each end of the connecting rod, the wheel axle is fixed on the wheel seat. The first pressure roller element is disposed on the wheel axle through a second bearing, and the second pressure roller element is disposed on the wheel axle through a second bearing.
2. The CT equipment according to claim 1, characterized in that, One of the first and second pressure roller groups includes an eccentric pressure roller group, and the other of the first and second pressure roller groups includes an axial pressure roller group; or... Both the first and second pressure roller groups are axial pressure roller groups; or... Both the first pressure roller group and the second pressure roller group are eccentric pressure roller groups.
3. The CT equipment according to claim 2, characterized in that, In the direction parallel to the rotation axis, the rotatable part sequentially includes a first rotation track, a rotatable part body, and a second rotation track. In a direction parallel to the rotation axis, the first pressure roller group is disposed on the side of the first rotation track away from the rotatable part body, and the second pressure roller group is disposed on the side of the second rotation track away from the rotatable part body.
4. The CT equipment according to claim 1, characterized in that, The first pressure roller element and the second pressure roller element are arranged symmetrically on the connecting rod about the center of the rotatable part.
5. The CT device according to claim 3, characterized in that, The mounting base has two pre-set screw holes on each side symmetrically about the center of the rotatable part, and the mounting base is fixedly connected to the frame by mounting bolts installed in the two screw holes.
6. The CT device according to claim 3, characterized in that, In the axial pressure roller assembly, each of the first pressure roller element and the second pressure roller element includes at least two axial pressure rollers stacked sequentially along the wheel axis direction.
7. The CT device according to claim 6, characterized in that, In the axial pressure roller assembly, the central axes of the first pressure roller element and the second pressure roller element coincide with the central axis of the wheel axle. The first pressure roller element and the second pressure roller element rotate on the wheel axle, and the minimum distance 'a' between at least a portion of the outer circumferential surface of any axial pressure roller and the end face of any rotating track along the direction of the rotation axis remains unchanged.
8. The CT device according to claim 3, characterized in that, In the eccentric pressure roller assembly, each of the first pressure roller element and the second pressure roller element includes at least two eccentric pressure rollers stacked sequentially along the wheel axis direction.
9. The CT device according to claim 8, characterized in that, In the eccentric pressure roller assembly, the wheel axle is an eccentric shaft, and the central axes of the first pressure roller element and the second pressure roller element do not coincide with the central axis of the wheel axle. The first pressure roller element and the second pressure roller element rotate eccentrically on the wheel axle, and the minimum distance b between at least a portion of the outer circumferential surface of any eccentric pressure roller and the end face of any rotating track along the direction of the rotation axis varies.
10. The CT device according to claim 3, characterized in that, In the axial pressure roller assembly, each of the first pressure roller element and the second pressure roller element includes at least two axial pressure rollers stacked sequentially along the wheel axis direction; in the eccentric pressure roller assembly, each of the first pressure roller element and the second pressure roller element includes at least two eccentric pressure rollers stacked sequentially along the wheel axis direction; the minimum distance 'a' between at least a portion of the outer peripheral surface of any axial pressure roller and the end face of any rotating track along the rotation axis direction, and the minimum distance 'b' between at least a portion of the outer peripheral surface of any eccentric pressure roller and the end face of any rotating track along the rotation axis direction, together adjust the movement of the rotatable part along the rotation axis direction.
11. The CT device according to claim 3, characterized in that, In the eccentric pressure roller assembly, The rotating shaft is configured as an eccentric rotating shaft, and the rotating shaft is fixed to the inner ring of the first bearing. The inner ring of the first bearing cooperates with the eccentric rotating shaft to cause the connecting rod to rotate eccentrically. Each of the first pressure roller element and the second pressure roller element includes at least two axial pressure rollers stacked sequentially along the wheel axis direction.
12. The CT device according to claim 5, characterized in that, The eccentric pressure roller assembly also includes: The fixed base has pre-set elongated holes on both sides symmetrically about the center of the rotatable part, along the direction of the rotation axis, and the fixed base can move along the elongated holes.
13. The CT equipment according to claim 1, characterized in that, The surface of either the first pressure roller element or the second pressure roller element is a cylindrical surface.