CN219475448U - CT apparatus - Google Patents

Abstract

There is provided a CT apparatus comprising: a frame; at least one rotary driving device arranged on the frame; at least one supporting device arranged on the frame; a rotatable portion rotatable about a rotation axis driven by the at least one rotation driving device, the rotatable portion being supported by the at least one rotation driving device and the at least one supporting device together during rotation of the rotatable portion; and the scanning device comprises a ray source and a detector, the ray source and the detector are arranged on the rotatable part, the ray source and the detector are oppositely arranged along the radial direction of the rotatable part, wherein at least one supporting device comprises a pivotable arm and at least two driven wheels, the pivotable arm is pivotably connected to the frame, the at least two driven wheels are arranged on the pivotable arm and are respectively positioned at two sides of the pivot axis of the pivotable arm, and the rotatable part can apply friction force to the at least two driven wheels in the rotating process to drive the at least two driven wheels to rotate respectively.

Description

CT apparatus

Technical Field

The utility model relates to the technical field of radiation inspection, in particular to a CT device.

Background

CT technology plays an important role in security inspection because it can eliminate the effects of object overlapping. CT equipment is also widely used in technical fields such as article detection, and CT equipment not only can detect smaller articles such as traveling bags and aviation containers, but also can detect larger articles such as containers and vehicles.

In the related art, a CT apparatus acquires projection data at different angles by rotation of an X-ray machine and a detector using a slip ring device, acquires tomographic images by a reconstruction method, and thus acquires internal information of a baggage item to be detected. The existing baggage item inspection equipment can reconstruct the atomic number and electron density of the inspected substance by matching with a dual-energy or multi-energy imaging technology, thereby realizing the identification of the substance type and playing a good role in the detection of explosives, dangerous goods and the like.

For example, in the related art, the CT apparatus mainly employs a single large bearing as a rotation support, the entire CT imaging system is mounted on the large bearing, and the CT imaging system is driven to rotate by a motor and a v-ribbed belt. For the CT equipment of the type, the large bearing is used as a key supporting component, so that the bearing is not easy to maintain after being damaged, and the workload of replacing the bearing is large; due to the structural reasons, the components on the imaging system are inconvenient to maintain and replace; the V-ribbed belt is used as a key component in the transmission system, is sleeved outside the V-ribbed belt, is not easy to replace after being damaged, and is easy to cause transmission system failure due to excessive tensioning; the CT imaging system is installed in a cantilever state, and a overturning moment is applied to the bearing, so that the service life of the bearing is influenced, and the rigidity of the CT imaging system is required to be enhanced.

The above information disclosed in this section is only for understanding the background of the technical idea of the present utility model, and thus, the above information may contain information that does not constitute the prior art.

Disclosure of Invention

In order to solve the above-mentioned problems in the prior art, embodiments of the present utility model provide a CT apparatus having advantages of easy maintenance, compact structure and light weight.

One aspect of the present utility model provides a CT apparatus comprising: a frame; a plurality of support devices disposed on the frame, each of the support devices including a plurality of rotatable wheels, wherein at least one rotatable wheel of at least one support device acts as a drive wheel; a rotatable portion rotatable about a rotation axis by the drive wheel, the rotatable portion being commonly supported by the plurality of support devices during rotation of the rotatable portion; the scanning device comprises a ray source and a detector, wherein the ray source and the detector are arranged on the rotatable part and are oppositely arranged along the radial direction of the rotatable part; and an axial limiting mechanism for limiting movement of the rotatable portion in a direction parallel to the rotational axis.

In some exemplary embodiments, the axial stop mechanism includes a first axial stop mechanism for limiting movement of the rotatable portion in a first direction and a second axial stop mechanism for limiting movement of the rotatable portion in a second direction, both of the first and second directions being parallel to the rotational axis and opposite each other.

In some exemplary embodiments, the CT apparatus further comprises a radial stop mechanism for limiting movement of the rotatable portion in a third direction parallel to and opposite to the direction of gravity.

In some exemplary embodiments, the rotatable portion includes a rotatable body and at least one rotatable track, the scanning device is disposed on the rotatable body, and the first axial stop mechanism and the second axial stop mechanism are disposed on both sides of the at least one rotatable track, respectively, in a direction parallel to the rotational axis.

In some exemplary embodiments, the rotatable portion includes two rotatable rails between which the rotatable body is sandwiched in a direction parallel to a rotation axis of the rotatable portion, and the first axial limit mechanism is disposed on a side of one of the two rotatable rails away from the rotatable body in a direction parallel to the rotation axis, and the second axial limit mechanism is disposed on a side of the other of the two rotatable rails away from the rotatable body.

In some exemplary embodiments, each of the two rotatable tracks is supported by at least two of the support devices disposed below the rotatable track and on either side of the rotational axis of the rotatable portion.

In some exemplary embodiments, the first axial stop mechanism includes an axial pinch roller disposed proximate an end face of one of the rotatable rails facing in the first direction, and a minimum distance between an outer circumferential surface of the axial pinch roller and the end face of the rotatable rail facing in the first direction remains constant during rotation of the axial pinch roller.

In some exemplary embodiments, the second axial stop mechanism includes an axial eccentric pinch roller disposed proximate an end face of one of the rotatable rails facing in the second direction, a minimum distance between an outer circumferential surface of the axial eccentric pinch roller and the end face of the rotatable rail facing in the second direction being varied during rotation of the axial eccentric pinch roller.

In some exemplary embodiments, the radial stop mechanism includes a radial pinch roller disposed proximate an inner peripheral surface of one of the rotatable rails facing in the third direction, a minimum distance between an outer peripheral surface of the radial pinch roller and the inner peripheral surface of the rotatable rail facing in the third direction remaining constant during rotation of the radial pinch roller.

In some exemplary embodiments, the radial stop mechanism includes a radial eccentric pinch roller disposed adjacent to an inner peripheral surface of one of the rotatable rails facing in the third direction, and a minimum distance between an outer peripheral surface of the radial eccentric pinch roller and the inner peripheral surface of the rotatable rail facing in the third direction is varied during rotation of the radial eccentric pinch roller.

Additional aspects and advantages of the utility model 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 the utility model.

Drawings

For a more complete understanding of the present utility model, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

fig. 1 schematically illustrates a cantilever mounting state of a CT imaging system in a CT apparatus in the related art;

fig. 2 is a front view of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 3 is a side view of a CT apparatus according to some exemplary embodiments of the present utility model;

fig. 4A is an enlarged view of a supporting device of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 4B is a side view of the support device shown in FIG. 4A;

fig. 5A is an enlarged view of a supporting device of a CT apparatus according to some exemplary embodiments of the present utility model, wherein the supporting device includes at least one rotating wheel as a driving wheel;

fig. 5B is a side view of the support device shown in fig. 5A.

FIG. 6A is an enlarged partial view of an axial stop mechanism of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 6B is an enlarged partial view of an axial stop mechanism of a CT apparatus according to further exemplary embodiments of the present utility model;

FIG. 6C is an enlarged partial view of an axial stop mechanism of a CT apparatus according to still further exemplary embodiments of the present utility model;

FIG. 7A is an enlarged view of a portion of a radial stop mechanism of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 7B is a side view of the radial stop mechanism shown in FIG. 7A;

fig. 8A is a front view of a CT apparatus according to further exemplary embodiments of the present utility model;

FIG. 8B is a side view of a CT apparatus according to further exemplary embodiments of the present utility model;

fig. 9A schematically illustrates an installation state of a scanning device in a CT apparatus according to an embodiment of the present utility model; and

Fig. 9B schematically shows the relative positions of scanning devices in a CT apparatus according to an embodiment of the present utility model.

Detailed Description

Hereinafter, embodiments of the present utility model will be described with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model. In addition, the respective embodiments of the present utility model and technical features in the embodiments may be combined with each other in any manner.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Furthermore, the terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components. All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. The term "directly connected" means that there is no connection between two elements through other intermediate elements.

In some related art, the CT apparatus mainly uses a single large bearing as a rotation support, and the entire CT imaging system is mounted on the large bearing and is driven to rotate by a motor and a v-ribbed belt. For the CT equipment of the type, the large bearing is used as a key supporting component, so that the bearing is not easy to maintain after being damaged, and the workload of replacing the bearing is large; due to the structural reasons, the components on the imaging system are inconvenient to maintain and replace; the V-ribbed belt is used as a key component in the transmission system, is not easy to replace after being damaged because the V-ribbed belt is sleeved outside the V-ribbed belt, and is easy to cause transmission system faults due to excessive tensioning. Fig. 1 schematically illustrates a cantilever mounting state of a CT imaging system in a CT apparatus in the related art. As shown in fig. 1, the CT imaging system is installed in a cantilever state, and the CT imaging system generally includes a plurality of components such as a radiation source and a detector, and the whole CT imaging system applies a tilting moment to the bearing, so that the installation of such a cantilever not only affects the service life of the bearing, but also needs to strengthen the rigidity of the CT imaging system.

Fig. 2 is a front view of a CT apparatus according to some exemplary embodiments of the present utility model, and fig. 3 is a side view of the CT apparatus according to some exemplary embodiments of the present utility model. Referring to fig. 2 and 3 in combination, a CT apparatus 100 according to some exemplary embodiments of the present utility model may include: a first housing 110; a plurality of supporting devices 1 provided on the first frame 110; a rotatable portion 5, the rotatable portion 5 being rotatable about a rotation axis AX1, the rotatable portion 5 being commonly supported by the plurality of support devices 1 during rotation of the rotatable portion 5; the scanning device may, for example, comprise a radiation source 130 and a detector 140, both the radiation source 130 and the detector 140 being arranged on the rotatable part 5, and the radiation source 130 and the detector 140 being arranged opposite each other in a radial direction of the rotatable part. In the embodiment of the present utility model, the radiation source 130 and the detector 140 are configured to be rotated by the same rotatable part 5, and rotational synchronism is more easily ensured.

For example, the scanning device is used for scanning the object to be detected. The radiation source 130 is used to generate X-rays that penetrate the object to be examined, and may employ an X-ray machine or an accelerator. The detector 140 is configured to receive X-rays passing through the object to be detected, and convert the received X-rays into recordable electrical signals for use by an imaging device of the CT apparatus to generate CT images, which may employ a detector array structure.

In this embodiment, as shown in fig. 2, both the source 130 and the detector 140 of the scanning device are arranged on the rotatable part 5. When the object to be inspected passes through the inspection channel, the radiation source 130 may emit X-rays to penetrate the object to be inspected, and the X-rays penetrating the object to be inspected may be incident on the detector 140 disposed opposite to the radiation source 130, so that a CT image may be formed. And when scanning each time, one section of the object to be detected is placed in the passage, and the corresponding section of the object to be detected is scanned by the device to be scanned. When scanning of one section is completed, the object to be detected is pulled to the position of the next section by the traction device of the CT inspection system and is positioned in the passage so as to complete the scanning of the next section. And continuing until the scanning of the whole object to be detected is completed. For example, the object to be inspected may be a small article (e.g., a luggage article), a large cargo (e.g., a container), a vehicle, an airplane, or the like, and embodiments of the present utility model are not particularly limited to the specific type of the object to be inspected.

In an embodiment of the utility model, each support device 1 may comprise a plurality of swivel wheels 13, wherein at least one swivel wheel 13 of at least one support device 1 may act as a drive wheel, which may drive the swivel part 5 to swivel about a swivel axis AX 1. The other rotating wheels 13 of the support device 1 may be driven wheels, to which the rotatable part 5 can exert a friction force during rotation to bring the driven wheels into rotation. During rotation of the rotatable part 5, the plurality of rotating wheels 13 of the plurality of support devices 1, both as rotating wheels of the driving wheel and as rotating wheels of the driven wheel, can support the rotatable part 5. That is, in the CT apparatus provided by the embodiment of the present utility model, a plurality of supporting wheels are provided for the rotatable portion 5 at intervals, so as to implement distributed multi-point rotation support, thereby avoiding the problem of using a single large bearing as rotation support, improving the rigidity of the system, and improving the stability of the CT imaging system during high-speed rotation.

Fig. 4A is an enlarged view of a supporting device of a CT apparatus according to some exemplary embodiments of the present utility model. Fig. 4B is a side view of the support device shown in fig. 4A. Fig. 5A is an enlarged view of a supporting device of a CT apparatus according to some exemplary embodiments of the present utility model, wherein the supporting device includes at least one rotating wheel as a driving wheel. Fig. 5B is a side view of the support device shown in fig. 5A.

Referring to fig. 4A and 4B in combination, in some exemplary embodiments of the present utility model, at least one support device 1 may have a "teeter-totter" structure among the plurality of support devices 1. Specifically, the at least one supporting device 1 may include a pivotable arm 11, a pivot 12, and at least two rotating wheels 13, where the pivotable arm 11 is pivotably connected to the first frame 110 through the pivot 12, the at least two rotating wheels 13 are disposed on the pivotable arm 11 and located on two sides of a pivot axis of the pivotable arm 11, respectively, and the at least two rotating wheels 13 are driven wheels, and the rotatable part 5 can apply friction to the driven wheels 13 to rotate the driven wheels 13 during rotation. In the embodiment of the present utility model, by designing the supporting devices 1 as a "see-saw" type structure, each supporting device 1 can adaptively support the rotatable portion 5 during the rotation of the rotatable portion 5, that is, according to the contact, rotation, etc. of each supporting point, the pivotable arm 11 of each supporting device 1 can adaptively pivot, and the supporting force given to the rotatable portion 5 by each rotating wheel 13 is automatically distributed, so that a good supporting effect on the rotatable portion can be achieved.

Referring to fig. 5A and 5B in combination, in some exemplary embodiments of the present utility model, at least one support device 1 may serve the dual function of driving and supporting the rotatable portion 5 among the plurality of support devices 1. The structure of the support device 1 that serves the dual function of driving and supporting the rotatable portion 5 is mainly different from the structure of the support device 1 that serves the function of supporting the rotatable portion 5 in that: the supporting device 1, which serves the dual function of driving and supporting the rotatable part 5, is connected with components such as a driving motor, and the like, except for the fact that the two are substantially identical in structure, and in this context, substantially identical structures and components are denoted by the same reference numerals. Specifically, the at least one supporting device 1 may include a pivotable arm 11, a pivot 12, a driving motor 14, and at least two rotating wheels 13, the pivotable arm 11 being pivotably connected to the first frame 110 by the pivot 12, the at least two rotating wheels 13 being provided on the pivotable arm 11 and being located on both sides of the pivot axis of the pivotable arm 11, respectively, at least one of the at least two rotating wheels 13 being a driving wheel, which is connected to the driving motor 14 and is rotatable under the driving of the driving motor 14. In the embodiment of the present utility model, the supporting device 1, which serves the dual function of driving and supporting the rotatable part 5, also has a "teeter-totter" structure, so that the supporting device 1 can also adaptively support the rotatable part 5 during the rotation of the rotatable part 5.

In this context, the support device 1 that performs the dual function of driving and supporting the rotatable portion 5 may be referred to as a rotation driving device, and the support device 1 that performs the function of supporting the rotatable portion 5 without being connected to a driving motor may be referred to as a support device. It should be appreciated that the two structures differ primarily in: the supporting device 1, which serves the dual function of driving and supporting the rotatable part 5, is connected with a driving motor or the like, and has substantially the same structure except for the above.

In the embodiment of the utility model, the rotation stability of the ray source and the detector is effectively improved by arranging a distributed and self-adaptive multi-point support mode, which is beneficial to improving the image quality of CT equipment, improving the detection accuracy and prolonging the service life of each structural component of the CT equipment.

In an embodiment of the present utility model, the transmission process may be as follows: the drive motor 14 drives at least one rotary wheel 13 as a drive wheel to rotate, and the at least one rotary wheel 13 as a drive wheel drives the rotatable portion 5 to rotate by means of friction transmission, and the rotatable portion 5 drives the plurality of rotary wheels 13 as driven wheels to rotate by means of friction transmission. During rotation of the rotatable part 5, at least one rotation wheel 13 as a driving wheel drives and supports the rotatable part 5, and a plurality of rotation wheels 13 as driven wheels support the rotatable part 5.

It should be noted that, in the embodiment of the present utility model, each supporting device 1 may include at least two rotating wheels 13, for example, one supporting device 1 may include two rotating wheels 13. However, embodiments of the present utility model are not limited thereto, and for example, in other embodiments, one support device 1 may include a greater number of rotating wheels 13, for example, one support device 1 may include a multi-stage "teeter-totter" structure.

With continued reference to fig. 4A-5B, each support device 1 may also include a plurality of bearings, which may include, for example, a first bearing 61, a second bearing 62, a third bearing 63. In one support device 1, the pivotable arm 11 can be connected to the pivot 12 by means of a first bearing 61, and the two rotating wheels 13 are connected to the pivotable arm 11 by means of a second bearing 62 and a third bearing 63, respectively. That is, the pivotable arm 11 is rotatably supported on the pivot shaft 12 by means of the first bearing 11, and the two rotary wheels 13 can rotatably support the sub-pivotable arm 11 by means of the second bearing 62 and the third bearing 63, respectively. In the embodiment of the utility model, through the distributed multi-point support design, the rotation support mode of a single large bearing in CT equipment in related technology is adjusted to the rotation support mode of a plurality of distributed small bearings, and compared with the large bearings, the small bearings are lower in manufacturing difficulty and cost and more convenient to maintain and replace.

Further, referring to fig. 5A and 5B, the driving motor 14 is directly connected to the driving wheel 13. Specifically, the drive motor 14 includes a power output shaft 141, and the drive wheel 13 is directly connected to the power output shaft 141. For example, in one supporting device 1, 2 third bearings 63,2 are provided and the driving wheel 13 are respectively sleeved on the power output shaft 141 of the driving motor 14, and the 2 third bearings 63 are respectively located at both sides of the driving wheel 13.

In the embodiment of the utility model, the power output shaft 141 of the drive motor 14 is arranged parallel to the pivot 12 of the support device 1, that is to say the power output shaft 141 of the drive motor 14 is parallel to the pivot axis of the pivotable arm 11 and to the rotation axis of the two rotary wheels 13. By such an arrangement, it is advantageous to smoothly transmit the power of the driving motor to the driving wheel, and the driving motor does not increase the size of the entire supporting device in the circumferential direction of the rotatable portion, which is advantageous to the spatial layout of the respective components of the entire CT apparatus.

Referring to fig. 2, 4A and 5B, in the supporting device 1, the orthographic projections of the pivot axis 11AX of the pivotable arm 11 and the rotation axes 13AX of the respective two rotary wheels 13 on a first plane P1 are substantially on the same line, wherein the first plane P1 is a plane perpendicular to the rotation axis AX1 of the rotatable part 5. For example, in fig. 2, the first plane P1 is a plane where the paper surface is located. In the view of fig. 2, the 1 pivot centers and the 2 rotation centers of the same supporting device 1 are located on the same straight line, which is beneficial to improving the supporting effect of the supporting device 1 on the rotatable portion 5, and meanwhile, is beneficial to making the structure of the supporting device 1 compact, reducing the size of the supporting device 1 along the radial direction of the rotatable portion 5, and is further beneficial to the spatial layout of each component of the whole CT apparatus.

For example, in the embodiment of the present utility model, in the supporting device 1, the vertical distances between the respective rotation axes 13AX of the two rotation wheels 13 and the pivot axis 11AX of the pivotable arm 11 are substantially equal to each other, i.e., the distances between the orthographic projection of the respective rotation axes 13AX of the two rotation wheels 13 on the first plane P1 and the orthographic projection of the pivot axis 11AX of the pivotable arm 11 on the first plane P1 are equal to each other. By such a design, it is advantageous to reasonably distribute the supporting force of each rotating wheel.

For another example, the front projection of the drive motor 14 on the first plane P1 falls within the front projection of the pivotable arm 11 on the first plane P1. In this way, the drive motor does not increase the size of the entire support device in the circumferential direction of the rotatable portion, facilitating the spatial layout of the individual components of the entire CT apparatus.

In the embodiment of the utility model, the rotatable part 5 is used for providing a mounting matrix for the scanning device and is used for driving the scanning device to rotate so as to realize the rotation scanning of the object to be detected. The inner space of the rotatable part 5 may form an inspection channel 53 through which an object to be inspected may pass in a prescribed transport direction through the inspection channel 53. Wherein the prescribed transport direction may be parallel to the rotation axis AX1 of the rotatable part 5.

As shown in fig. 3, the CT apparatus may include at least two conveying devices 91, 92, for example, the conveying device 91 may be located upstream of the scanning device for conveying the object to be examined to the scanning device for CT scanning. A conveyor 92 may be located downstream of the scanning device for outputting a subject for which a CT scan has been completed.

For example, the conveying means 91, 92 may include a tape machine, but embodiments of the present disclosure are not limited thereto, and other driving means, such as a screw, a timing belt, a roller, a chain driving, etc., may be used instead of the tape driving.

Referring to fig. 2 and 3, the rotatable part 5 may include a rotatable body 51 and at least one rotatable rail 52, the scanning devices being disposed on the rotatable body 51, each supporting device 1 being at least partially in contact with the at least one rotatable rail 52.

For example, the rotatable body 51 may be provided in a circular ring shape, which on the one hand facilitates a relative arrangement of the radiation source 130 and the detector 140 of the scanning device and on the other hand also facilitates a rotation control. However, the embodiment of the present utility model is not limited thereto, and the rotatable body 51 may be provided so as to facilitate the arrangement of the scanning device and the scanning channel.

In some exemplary embodiments of the present utility model, the rotatable rail 52 may be provided in a ring shape, and the rotating wheel 13 of each supporting device 1 is partially contacted with at least one ring-shaped rotatable rail 52 to drive the rotatable rail 52 to rotate or to be rotated by the rotatable rail 52. By providing the rotatable rail 52, wear on the rotatable body 51 can be reduced. For example, the rotatable track 52 may be formed from a particular material that has been heat treated to increase its strength, hardness, and wear resistance.

In the embodiment of the present utility model, the number of the rotatable rails 52 may be one or two or more. Wherein, when rotatable track 52 is two, these two rotatable tracks 52 can be along rotatable portion 5's rotation axis AX1 interval sets up in proper order, forms double track bearing structure, and rotatable body 51 presss from both sides between two rotatable tracks 52 for can realize the more stable support to rotatable body 51 based on comparatively simple structure, and be convenient for make the focus of the rotation part of CT equipment be located between two rotatable tracks 52, reinforcing running stability. That is, by providing the dual-track support structure, the rotation stability of the CT apparatus can be further improved based on a simpler structure, so that a more stable and clear CT image can be conveniently obtained.

In the embodiment of the present disclosure, one of the two rotatable rails 52 is supported by two of the supporting means, and the other of the two rotatable rails 52 is supported by one of the supporting means and one of the rotation driving means. Optionally, each of the two rotatable tracks 52 is supported by one of the support means and one of the rotational drive means. Alternatively, one of the two rotatable rails 52 is supported by two of the rotation driving means, and the other of the two rotatable rails 52 is supported by one of the supporting means and one of the rotation driving means. That is, in the embodiment of the present disclosure, the number of rotation driving devices is not particularly limited.

Fig. 6A is an enlarged partial view of an axial stop mechanism of a CT apparatus according to some exemplary embodiments of the present utility model. Fig. 6B is an enlarged partial view of an axial stop mechanism of a CT apparatus according to further exemplary embodiments of the present utility model. Fig. 6C is an enlarged partial view of an axial stop mechanism of a CT apparatus according to still further exemplary embodiments of the present utility model.

Referring to fig. 2, 3, 6A and 6B in combination, the CT apparatus 100 may include an axial limiting mechanism 2, the axial limiting mechanism 2 being configured to limit movement of the rotatable portion 5 in a first direction D1 and a second direction D2, wherein the first direction D1 and the second direction D2 are each parallel to the rotational axis AX1 of the rotatable portion 5, and the first direction D1 and the second direction D2 are opposite. In the embodiment shown in fig. 3, the first direction D1 and the second direction D1 may be left-right directions, for example, the first direction D1 may be a left-to-right direction, and the second direction D2 may be a right-to-left direction.

In some exemplary embodiments, the axial limiting mechanism 2 may include: a first axial limiting mechanism 21, wherein the first axial limiting mechanism 21 is used for limiting the movement of the rotatable part 5 along the first direction D1; and a second axial limiting mechanism 22, the second axial limiting mechanism 22 being configured to limit movement of the rotatable part 5 in the second direction D2.

In the embodiment of the utility model, by arranging the axial limiting mechanism, the axial vibration of the rotatable part in the CT equipment in the high-speed rotation process can be effectively reduced and even inhibited, correspondingly, the axial vibration of the CT scanning device (namely the imaging system) can be effectively reduced and even inhibited, the axial vibration frequency of the CT scanning device (namely the imaging system) is reduced, and the overall noise of the CT equipment is also reduced.

For example, in a direction parallel to the rotation axis AX1, the first axial stopper mechanism 21 and the second axial stopper mechanism 22 are provided on both sides of the at least one rotatable rail 52, respectively.

Illustratively, the first axial stop mechanism 21 is disposed on a side of one of the two rotatable rails 52 away from the rotatable body 51 in a direction parallel to the rotational axis AX1, and the second axial stop mechanism 22 is disposed on a side of the other of the two rotatable rails 52 away from the rotatable body 52. As shown in fig. 3, two rotatable rails 52 are provided on the left and right sides of the rotatable body 51, respectively, the first axial limiting mechanism 21 may be provided on the left side of the rotatable rail 52 on the right side, and the second axial limiting mechanism 21 may be provided on the right side of the rotatable rail 52 on the left side.

Illustratively, as shown in fig. 6C, the first axial stopper mechanism 21 and the second axial stopper mechanism 22 may be provided on both sides of the same one of the two rotatable rails 52, respectively, in a direction parallel to the rotation axis AX 1. For example, the first axial stop mechanism 21 and the second axial stop mechanism 22 may be disposed on both sides of one rotatable rail 52 on the left or right side, respectively.

In the embodiment of the present utility model, one of the first axial limit mechanism 21 and the second axial limit mechanism 22 is a fixed distance limit mechanism, and the other is a variable distance limit mechanism. It should be noted that, for the fixed distance limiting mechanism, the axial distance of the portion of the limiting mechanism contacting or contacting the rotatable rail 52 from the rotatable rail 52 is fixed; for a variable distance limiting mechanism, the axial distance that the limiting mechanism contacts or separates the portion of rotatable track 52 that contacts rotatable track 52 is variable. That is, through the cooperation of fixed distance stop gear and variable distance stop gear, can make axial stop gear adapt to various different application occasions, avoid frequent adjustment axial stop gear because of reasons such as manufacturing tolerance, installation error.

One of the first axial stop 21 and the second axial stop 22 may comprise an axial pinch roller, which may be a fixed distance stop. During the rotation of the axial pinch roller, the minimum distance between the outer circumferential surface of the axial pinch roller and the end surface of the rotatable rail facing the first direction D1 remains unchanged. For example, the first axial stop mechanism 21 may include an axial pinch roller. The axial pinch roller is disposed adjacent an end face of one of the rotatable rails 52 facing in the first direction D1. Referring to fig. 3, the right-hand axial puck is placed near the right-hand rotatable rail 52 toward the end face (i.e., the right-hand end face) of the first direction D1.

The other of the first axial stop 21 and the second axial stop 22 may comprise an axial eccentric pinch roller, which may be a variable distance stop. During rotation of the axially eccentric pinch roller, a minimum distance along a second direction between an outer circumferential surface of the axially eccentric pinch roller and an end surface of the rotatable rail facing the second direction is varied. For example, the second axial stop mechanism 22 may include an axially eccentric puck. The axially eccentric pinch roller is disposed adjacent to an end face of the other rotatable rail 52 facing in the second direction D2. Referring to fig. 3, the axially eccentric puck on the left side is placed near the end face (i.e., the left end face) of the left side rotatable rail 52 in the second direction D2.

Alternatively, referring to fig. 6C, one of the first axial limit mechanism 21 and the second axial limit mechanism 22 may include an axial pinch roller, and the other one may include an axial eccentric pinch roller, which may be disposed near an end face of the same rotatable rail 52 facing the first direction D1 and an end face facing the second direction D2, respectively, that is, the axial pinch roller and the axial eccentric pinch roller may act on the same rotatable rail 52.

Referring to fig. 6A, the axial pinch roller may include a wheel seat 211, an axle 212, a wheel bearing 213, and a first pinch roller element 214, the wheel seat 211 may be fixedly connected to the first frame 110, the axle 212 is disposed on the wheel seat 211, the first pinch roller element 214 is disposed on the axle 212 through the wheel bearing 213, a central axis of the first pinch roller element 214 coincides with a central axis of the axle 212, the first pinch roller element 214 is capable of rotating on the axle 212, and at least a portion of an outer circumferential surface of the first pinch roller element 214 faces an end surface of the rotatable track 52 facing the first direction D1 (as shown in fig. 3).

Referring to fig. 6B, the axial eccentric pressing wheel may include a wheel seat 221, an axle 222, a wheel bearing 223, and a second pressing wheel element 224, the wheel seat 221 is fixedly connected to the first frame 110, the axle 222 is disposed on the wheel seat 221, the second pressing wheel element 224 is disposed on the axle 222 through the wheel bearing 223, an eccentric amount, such as an eccentric distance D, is provided between a central axis of the second pressing wheel element 224 and a central axis of the axle 222, the second pressing wheel element 224 can eccentrically rotate on the axle 222, and at least a portion of an outer circumferential surface of the second pressing wheel element 224 faces an end surface of the rotatable rail 52 facing the second direction D2 (as shown in fig. 3).

Referring to fig. 6C, the axial pinch roller and the axial eccentric pinch roller may share a wheel seat such that the axial pinch roller and the axial eccentric pinch roller constitute a pinch roller set.

Fig. 7A is an enlarged partial view of a radial stop mechanism of a CT apparatus according to some exemplary embodiments of the present utility model. Fig. 7B is a side view of the radial stop mechanism shown in fig. 7A. In the embodiment of the present utility model, the plurality of supporting devices 1 are further used for limiting the movement of the rotatable portion 5 along the first radial direction D3, and the CT apparatus 100 may further include a radial limiting mechanism 3 disposed on the first gantry 110, wherein the radial limiting mechanism 3 is used for limiting the movement of the rotatable portion 5 along the second radial direction D4, and the first radial direction D3 and the second radial direction D4 are parallel to the radial direction of the rotatable portion 5 and opposite to each other.

Here, for convenience of description, a top-to-bottom direction in the view in fig. 2 may be referred to as a first radial direction D3, and a bottom-to-top direction may be referred to as a second radial direction D4.

As described above, the plurality of support devices 1 pivotably support the rotatable portion 5, so that the rotatable portion 5 can be adaptively supported. Correspondingly, the radial limiting mechanism 3 may limit the movement of the rotatable part 5 in another radial direction. In the embodiment of the utility model, through the combined action of the plurality of supporting devices and the radial limiting mechanism 3, radial vibration of the rotatable part in the CT equipment in the high-speed rotation process can be effectively reduced or even restrained, correspondingly, the radial vibration of the CT scanning device (i.e. the imaging system) can be effectively reduced or even restrained, the axial vibration frequency of the CT scanning device (i.e. the imaging system) is reduced, and meanwhile, the overall noise of the CT equipment is also reduced.

Referring to fig. 2, 7A and 7B, the radial stopper mechanism 3 faces the inner peripheral surface of the annular rotatable rail 52. Specifically, the radial limit mechanism 3 includes a radial eccentric pinch roller that is rotatable, and a minimum distance between an outer circumferential surface of the radial eccentric pinch roller and an inner circumferential surface of the rotatable rail 52 in the second radial direction D4 is varied during rotation of the radial eccentric pinch roller. By arranging the limiting mechanism with the variable distance in the radial direction, the radial limiting mechanism can adapt to various different application occasions, and frequent adjustment of the radial limiting mechanism caused by manufacturing tolerance, installation error and the like is avoided.

For example, the radial eccentric pinch roller may include a wheel housing 31, an axle 32, a wheel bearing 33, and a first radial pinch roller element 34, the wheel housing 31 being fixedly connected to the first frame 110, the axle 32 being disposed on the wheel housing 31, the first radial pinch roller element 34 being disposed on the axle 32 through the wheel bearing 33, the central axis of the first radial pinch roller element 34 and the central axis of the axle 32 having an eccentric amount therebetween, the first radial pinch roller element 34 being capable of eccentrically rotating on the axle 32, at least a portion of an outer circumferential surface of the first radial pinch roller element 34 facing an inner circumferential surface of the rotatable track 52.

For example, the radial eccentric puck may include two of the wheel axles 32, two of the wheel bearings 33, and two of the first radial puck elements 34, with the central axes of the two wheel axles 32 being located at substantially the same level.

Fig. 8A is a front view of a CT apparatus according to other exemplary embodiments of the present utility model, and fig. 8B is a side view of the CT apparatus according to other exemplary embodiments of the present utility model. Note that the CT apparatus shown in fig. 8A and 8B may include all the structures, components, and elements of the CT apparatus described above, and hereinafter, mainly the differences thereof are described.

Referring to fig. 8A and 8B, the CT apparatus 100 may further include: the second rack 120, the second rack 120 is set up opposite to first rack 110; and a magnetic means 4 provided on at least one of the first housing 110 and the second housing 120, the magnetic means 4 for providing a magnetic force to the rotatable part 5 when the rotatable part 5 rotates, at least a part of the component of the magnetic force being opposite to the direction of the gravitational force of the rotatable part 5.

In the embodiment of the utility model, by arranging the magnetic device 4, the rotation weight of the rotatable part 5 can be properly reduced, and the radial impact force on the scanning device can be effectively reduced.

Referring to fig. 8A and 8B, a magnetic device 4 may be provided on the second housing 120, the magnetic device 4 for providing a magnetic attraction force to the rotatable part 5 when the rotatable part 5 rotates.

For example, the magnetic force device 4 may include a plurality of permanent magnets or electromagnets arranged on the second frame 120 in a spaced manner from each other in the rotation direction of the rotatable portion 5 (i.e., in the circumferential direction of the rotatable portion 5). The rotatable rail 52 of the rotatable portion 5 may include a magnetic material, or a magnetic portion composed of a magnetic material is mounted on the outer peripheral surface of the rotatable rail 52. In this way, the plurality of permanent magnets or electromagnets mounted on the second frame 120 can exert a magnetic attraction force on the rotatable rail 52, so that the rotation weight of the rotatable portion 5 can be appropriately reduced, and the radial impact force on the scanning device can be effectively reduced.

Fig. 9A schematically illustrates an installation state of a scanning device in a CT apparatus according to an embodiment of the present utility model. Fig. 9B schematically shows the relative positions of scanning devices in a CT apparatus according to an embodiment of the present utility model.

Referring to fig. 9A and 9B, in the embodiment of the present utility model, a scanning device including a radiation source 130 and a detector 140 is disposed between two rotatable rails 52, and the rotation stability of the scanning device located in the middle is high, avoiding various problems caused by cantilever mounting.

In an embodiment of the present utility model, the detector 140 may be disposed in an arc shape centered on the corresponding radiation source 130. For example, the detector 140 adopts a detector array structure, a plurality of detectors are arranged on a detecting arm in an array shape, and the detecting arm takes an arc shape centered on the radiation source 130. Because the detector 140 is arc-shaped with the radiation source 130 as the center, the distances from different parts of the whole detector 140 to the radiation source 130 are the same, i.e. the distances from each detector in the detector array to the radiation source 130 are the same.

In the embodiment of the present utility model, two supporting devices are disposed below the same rotatable rail 52 on both sides of the rotation axis, so that the two supporting devices can more stably support the rotatable portion 5 at the positions corresponding to the corresponding rotatable rail 52, and the two supporting devices can more effectively and stably act on the rotatable rail 52 to support the rotatable portion 5 to more effectively and stably rotate.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents. Those skilled in the art will appreciate that the features recited in the various embodiments of the utility model and/or in the claims may be combined in various combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the utility model. In particular, the features recited in the various embodiments of the utility model and/or in the claims can be combined in various combinations and/or combinations without departing from the spirit and teachings of the utility model. All such combinations and/or combinations fall within the scope of the utility model.

Claims (10)

1. A CT apparatus, comprising:

a frame;

a plurality of support devices disposed on the frame, each of the support devices including a plurality of rotatable wheels, wherein at least one rotatable wheel of at least one support device acts as a drive wheel;

a rotatable portion rotatable about a rotation axis by the drive wheel, the rotatable portion being commonly supported by the plurality of support devices during rotation of the rotatable portion;

the scanning device comprises a ray source and a detector, wherein the ray source and the detector are arranged on the rotatable part and are oppositely arranged along the radial direction of the rotatable part; and

an axial limiting mechanism for limiting movement of the rotatable portion in a direction parallel to the rotational axis.

2. The CT apparatus of claim 1, wherein the axial stop mechanism comprises a first axial stop mechanism for limiting movement of the rotatable portion in a first direction and a second axial stop mechanism for limiting movement of the rotatable portion in a second direction, the first and second directions being both parallel to the axis of rotation and opposite each other.

3. The CT apparatus of claim 2, further comprising a radial stop mechanism for limiting movement of the rotatable portion in a third direction, the third direction being parallel to and opposite the direction of gravity.

4. The CT apparatus according to claim 3, wherein said rotatable portion comprises a rotatable body and at least one rotatable track, said scanning device being disposed on said rotatable body,

the first axial stop mechanism and the second axial stop mechanism are disposed on either side of the at least one rotatable track in a direction parallel to the axis of rotation.

5. The CT apparatus according to claim 4, wherein the rotatable portion includes two rotatable rails, the rotatable body being sandwiched between the two rotatable rails in a direction parallel to a rotation axis of the rotatable portion,

the first axial limiting mechanism is disposed on a side of one of the two rotatable rails away from the rotatable body in a direction parallel to the rotational axis, and the second axial limiting mechanism is disposed on a side of the other of the two rotatable rails away from the rotatable body.

6. The CT apparatus of claim 5 wherein each of the two rotatable rails is supported by at least two of the support devices disposed below the rotatable rails on either side of the axis of rotation of the rotatable portion.

7. The CT apparatus according to any one of claims 4-6, wherein the first axial stop mechanism comprises an axial pinch roller disposed proximate an end face of one of the rotatable rails facing in a first direction,

during the rotation of the axial pinch roller, a minimum distance along the first direction between the outer circumferential surface of the axial pinch roller and the end surface of the rotatable rail facing the first direction remains unchanged.

8. The CT apparatus of claim 7 wherein the second axial stop mechanism comprises an axially eccentric pinch roller disposed adjacent an end face of one of the rotatable rails facing in the second direction,

during rotation of the axially eccentric pinch roller, a minimum distance along a second direction between an outer circumferential surface of the axially eccentric pinch roller and an end surface of the rotatable rail facing the second direction is varied.

9. The CT apparatus according to any one of claims 4 to 6, wherein the radial stopper mechanism comprises a radial pinch roller disposed adjacent to an inner peripheral surface of one of the rotatable rails toward a third direction,

during rotation of the radial pinch roller, a minimum distance between an outer circumferential surface of the radial pinch roller and an inner circumferential surface of the rotatable rail facing a third direction remains unchanged along the third direction.

10. The CT apparatus according to claim 9, wherein the radial stopper mechanism comprises a radial eccentric pinch roller disposed near an inner peripheral surface of one of the rotatable rails toward a third direction,

during rotation of the radial eccentric pinch roller, a minimum distance between an outer circumferential surface of the radial eccentric pinch roller and an inner circumferential surface of the rotatable rail toward a third direction is varied along the third direction.