CN219957411U - Radial limiting device for CT equipment and CT equipment - Google Patents

Abstract

The utility model provides a radial limiting device for CT equipment and the CT equipment, which are applied to the technical field of radiation inspection. The radial limiting device comprises: a plurality of support means limiting movement of the rotatable portion in a first radial direction; and a radial limiting mechanism for limiting movement of the rotatable portion in a second radial direction, the first and second radial directions being both along a radial direction of the rotatable portion and opposite to each other.

Description

Radial limiting device for CT equipment and CT equipment

Technical Field

The utility model relates to the technical field of radiation inspection, in particular to a radial limiting device for a CT device and the 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 rotatable part of a CT apparatus scans and detects a target object by rotating a scanning device, and in the process of rotating the rotatable part, since the scanning device is rotatably provided, when the rotatable part rotates, a vibration is easily generated when the center of gravity of the rotatable part is not on a rotation axis, which results in an unclear imaging of the CT apparatus, and when the rotatable part vibrates, the internal components are easily damaged.

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 problems in the prior art, an embodiment of the present utility model provides a radial limiting device for a CT apparatus and the CT apparatus, where the CT apparatus can effectively inhibit movement of a rotatable portion in the CT apparatus in a radial direction, reduce vibration of the CT apparatus, and improve imaging effect and service life of the apparatus.

One aspect of the present utility model provides a radial stop for a CT apparatus including a rotatable portion, the radial stop comprising: a plurality of support means limiting movement of the rotatable portion in a first radial direction; and a radial limiting mechanism for limiting movement of the rotatable portion in a second radial direction, the first and second radial directions being both along a radial direction of the rotatable portion and opposite to each other.

According to some exemplary embodiments, the radial stop mechanism 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 portion in a second radial direction is varied during rotation of the radial eccentric pinch roller.

According to some exemplary embodiments, the radial stop mechanism comprises a radial pinch roller, the radial pinch roller being rotatable, a minimum distance between an outer circumferential surface of the radial pinch roller and an inner circumferential surface of the rotatable portion in a second radial direction remaining unchanged during rotation of the radial pinch roller.

According to some exemplary embodiments, the radial eccentric pinch roller includes a wheel seat fixedly connected to the first frame, a wheel shaft provided on the wheel seat, a wheel bearing provided on the wheel shaft through the wheel bearing, and a first radial pinch roller element having an eccentric amount between a central axis of the first radial pinch roller element and a central axis of the wheel shaft, the first radial pinch roller element being capable of eccentrically rotating on the wheel shaft, at least a portion of an outer circumferential surface of the first radial pinch roller element facing an inner circumferential surface of the rotatable rail.

According to some exemplary embodiments, the radial pinch roller includes a wheel seat fixedly connected to the first frame, a wheel shaft provided on the wheel seat, a wheel bearing provided on the wheel shaft through the wheel bearing, a central axis of the second radial pinch roller element coinciding with a central axis of the wheel shaft, and a second radial pinch roller element rotatable on the wheel shaft, at least a portion of an outer circumferential surface of the second radial pinch roller element facing an inner circumferential surface of the rotatable rail.

According to some exemplary embodiments, the radial eccentric puck includes two of the wheel axles, two of the wheel bearings, and two of the first radial puck elements, the central axes of the two wheel axles being located substantially at the same level.

According to some exemplary embodiments, the radial pinch roller comprises two of the wheel axles, two of the wheel bearings, and two of the second radial pinch roller elements, the central axes of the two wheel axles being located substantially at the same level.

According to some exemplary embodiments, at least one of the support means comprises a pivotable arm pivotably connected to the gantry of the CT apparatus and at least two swivel wheels arranged on the pivotable arm on both sides of the pivot axis of the pivotable arm, respectively, the at least two swivel wheels being for supporting the rotatable part.

In a further aspect, a CT apparatus is provided, comprising a radial stop as described above.

According to 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, the two rotatable rails each being an annular rail, the radial stopper mechanism facing an inner peripheral surface of at least one of the annular rails.

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. 1A is a front view of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 1B is a side view of a CT apparatus according to some exemplary embodiments of the present utility model;

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

fig. 2B is a side view of a rotatable portion of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 3A is a front view of a radial stop mechanism of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 3B is a schematic diagram of a radial puck of a CT apparatus according to some exemplary embodiments of the present utility model;

FIG. 3C is a schematic diagram of a radial eccentric puck of a CT apparatus according to some exemplary embodiments of the present utility model;

fig. 4A is a front 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 a support device of a CT apparatus according to some exemplary embodiments of the present utility model;

fig. 5A is a schematic structural view of a magnetic device of a CT apparatus according to an exemplary embodiment of the present utility model;

fig. 5B is a schematic structural view of a magnetic device of a CT apparatus according to another exemplary embodiment of the present utility model;

fig. 5C is a side view of the CT apparatus of fig. 5B.

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 CT apparatus according to the embodiment of the present utility model will be described in detail with reference to fig. 1A to 5C.

Fig. 1A is a front view of a CT apparatus according to some exemplary embodiments of the present utility model. Fig. 1B is a side view of a CT apparatus according to some exemplary embodiments of the present utility model.

As shown in fig. 1A and 1B, the CT apparatus 100 includes: the scanning device comprises a first frame 110, a supporting device 1, a rotatable part 2, a scanning device 3 and a radial limiting mechanism 6.

The first frame 110 is used for supporting the CT apparatus 100, the supporting device 1 is disposed on the first frame 110, and the supporting device 1 may be disposed in plurality, for example, two are disposed opposite to a first side edge near a lower side of the first frame 110, and two are disposed opposite to a second side edge of the first frame 110 near the lower side opposite to the first side edge. The support device 1 is used for supporting the rotatable part 2, for example, every two support devices 1 located on the same side constitute a support device group for supporting the rotatable part 2.

The support device 1 comprises a plurality of rotatable wheels 13, wherein at least one rotatable wheel 13 of at least one support device 1 acts as a driving wheel. The specific structure of the support device 1 is described in detail below.

The rotatable part 2 is rotatable about the rotation axis AX1 by driving of the driving wheels of the supporting device 1, and the rotatable part 2 is commonly supported by a plurality of supporting devices during rotation of the rotatable part 2. For example, the rotatable part 2 is supported by two sets of the supporting devices 1 near the lower left and lower right in fig. 1A, respectively, and the rotatable part 2 is rotated by the driving wheel, and when the rotatable part 2 rotates, the rotatable wheels 13 of the other supporting devices 1 without driving wheels are in the opposite direction to the rotation direction of the rotatable part 2, thereby effectively reducing the resistance when the rotatable part 2 rotates.

Fig. 2A is a front view of a rotatable portion of a CT apparatus according to some exemplary embodiments of the present utility model. Fig. 2B is a side view of a rotatable portion of a CT apparatus according to some exemplary embodiments of the present utility model.

As shown in fig. 2A and 2B, the scanning device 3 includes a radiation source 31 and a detector 32, both of which are disposed on the rotatable portion 2, and the radiation source 31 and the detector 32 are disposed opposite to each other in a radial direction of the rotatable portion. For example, the radiation source 31 is disposed at a first position on the circumferential side of the rotatable part 2, the detector 32 is disposed at a second position opposite to the first position on the circumferential side, and the centers of gravity of the radiation source 31 and the detector 32 are located on the rotation axis AX1 or substantially in the vicinity of the rotation axis AX1, thereby ensuring that no or less vibration occurs when the rotatable part 2 rotates the radiation source 31 and the detector 32.

In an embodiment of the present utility model, the plurality of supporting devices 1 limit the movement of the rotatable part 2 in the first radial direction D1, and the CT apparatus 100 further comprises a radial limiting mechanism 6 provided on the first gantry 110, the radial limiting mechanism 6 being configured to limit the movement of the rotatable part 2 in the second radial direction D2, the first radial direction D1 and the second radial direction D2 being both radial to the rotatable part and opposite to each other.

Illustratively, the first radial direction D1 and the second radial direction intersect the rotation axis AX1 of the rotatable part 2, that is, each of the supporting device 1 and the limiting structure 6 limits the movement of the rotatable part 2, so that the rotation axis AX1 of the rotatable part 2 is substantially maintained at a fixed position, so that the rotatable part 2 is maintained in a stable state when rotated, and the problem of vibration of the CT apparatus caused by deviation of the rotation center of the rotatable part 2 when rotated is avoided.

In some embodiments of the present utility model, as shown in fig. 1B and fig. 2A and 2B, the rotatable part 2 includes a rotatable body 22 and at least one rotatable rail 21, the scanning device 3 is provided on the rotatable body 22, the at least one rotatable rail 21 is a circular rail, that is, at least one of the rotatable rails 21 is a circular rail having an inner peripheral surface and an outer peripheral surface, and a circular center formed by the inner peripheral surface and a circular center formed by the outer peripheral surface of the circular rail are the same, that is, concentric circles. As shown in fig. 1A, the radial stopper mechanism 6 faces the inner peripheral surface of the annular rail, that is, the stopper mechanism 6 is in contact with the inner peripheral surface of the annular rail, and the stopper mechanism 6 generates a force toward the first radial direction D1 on the annular rail.

In some embodiments of the present utility model, as shown in fig. 2A and 2B, the rotatable portion 2 includes two rotatable rails 21, between which the rotatable body 22 is sandwiched in a direction parallel to the rotation axis AX1 of the rotatable portion 2, the two rotatable rails 21 are both annular rails, and the radial stopper mechanism 6 faces an inner peripheral surface of at least one of the annular rails.

Illustratively, a radial stopper mechanism 6 may be provided on one side of the rotatable body 22 in a direction parallel to the rotation axis AX1 of the rotatable portion 2, the radial stopper mechanism 6 facing the inner peripheral surface of an annular track.

For another example, one radial stopper mechanism 6 may be provided on each of both sides of the rotatable body 22 in a direction parallel to the rotation axis AX1 of the rotatable portion 2, with two of the radial stopper mechanisms 6 facing the inner peripheral surfaces of the two annular rails.

Fig. 3A is a front view of a radial stop mechanism of a CT apparatus according to some exemplary embodiments of the present utility model. Fig. 3B is a schematic structural view of a radial pinch roller of a CT apparatus according to some exemplary embodiments of the present utility model. Fig. 3C is a schematic structural view of a radial eccentric puck of a CT apparatus according to some exemplary embodiments of the present utility model.

In some embodiments of the present utility model, as shown in fig. 3A-3C, the radial stop mechanism may include a radial pinch roller and a radial eccentric pinch roller.

As shown in fig. 3B, the radial stopper mechanism 6 includes a radial eccentric pressing wheel 60, and the radial eccentric pressing wheel 60 is rotatable, and a minimum distance between an outer circumferential surface of the radial eccentric pressing wheel 60 and an inner circumferential surface of the rotatable rail in the second radial direction is varied during rotation of the radial eccentric pressing wheel.

For example, when the rotatable rail 2 moves along the radial direction of the rotatable rail 2, the rotatable rail 2 is restored and limited to the initial position by the change of the minimum distance between the outer peripheral surface of the radial eccentric pressing wheel 60 and the inner peripheral surface of the rotatable rail along the second radial direction D2, so that the rotatable rail 2 is effectively prevented from shifting during rotation.

As shown in fig. 3B, the radial eccentric pinch roller 60 includes a wheel seat 61, an axle 62, a wheel bearing 63, and a first radial pinch roller element 64, the wheel seat 61 is fixedly connected to a first frame 110, the axle 62 is disposed on the wheel seat 61, the first radial pinch roller element 64 is disposed on the axle 62 through the wheel bearing 63, an eccentric amount, for example, an eccentric amount distance d, is provided between a central axis of the first radial pinch roller element 64 and a central axis of the axle 62, the first radial pinch roller element 64 is capable of eccentrically rotating on the axle 62, and at least a portion of an outer circumferential surface of the first radial pinch roller element 64 faces an inner circumferential surface of the rotatable rail.

As shown in fig. 3C, the radial stopper mechanism 6 includes a radial pinch roller 60', the radial pinch roller 60' being rotatable, and a minimum distance between an outer circumferential surface of the radial pinch roller 60 'and an inner circumferential surface of the rotatable track in the second radial direction D2 is maintained during rotation of the radial pinch roller 60'.

For example, when the radial pressing wheel 60' contacts the inner circumferential surface of the rotatable rail, the rotatable rail is restrained, so that the rotatable rail is prevented from being deviated during rotation, thereby preventing the rotatable rail from being vibrated due to the deviation.

As shown in fig. 3C, the radial pinch roller 60 'includes a wheel housing 61, an axle 62, a wheel bearing 63, and a second radial pinch roller element 64', the wheel housing 61 being fixedly connected to the first frame 110, the axle 62 being provided on the wheel housing 61, the second radial pinch roller element 64 'being provided on the axle 62 through the wheel bearing 63, a central axis of the second radial pinch roller element 64' coinciding with a central axis of the axle 62, the second radial pinch roller element 64 'being rotatable on the axle 62, at least a portion of an outer circumferential surface of the second radial pinch roller element 64' facing an inner circumferential surface of the rotatable rail.

As shown in fig. 3A, the mirror-image limiting mechanism may include a radial eccentric puck and/or a radial puck. The radial eccentric pinch roller and the radial pinch roller can be combined.

In some embodiments of the present utility model, radial eccentric puck 60 may include two axles 62, two wheel bearings 63, and two first radial puck elements 64, with the central axes of the two axles 62 being located at substantially the same level.

In some embodiments of the present utility model, radial puck 60 'includes two axles 62, two wheel bearings 63, and two second radial puck elements 64', the central axes of the two axles 62 being located at substantially the same level.

Fig. 4A is a front 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 a support device of a CT apparatus according to some exemplary embodiments of the present utility model.

As shown in fig. 4A and 4B, the support device 1 includes a pivotable arm 11, a pivot 12, and a rotating wheel 13.

As shown in fig. 4A and 4B, each support means may comprise one pivotable arm 11, each of which is provided with a plurality of swivel wheels 13, e.g. two swivel wheels 13 symmetrically arranged at both ends of the pivotable arm. The pivotable arm 11 is pivotally connected to the first housing 110, e.g. the pivotable arm 11 is pivotally connected to the first housing via a pivot 12, the pivotable arm 11 being rotatable about the pivot 12.

In particular, the at least one support device 1 may comprise a pivotable arm 11, a pivot 12 and at least two swivel wheels 13, the pivotable arm 11 being pivotably connected to the first frame 110 by means of the pivot 12, the at least two swivel wheels 13 being arranged on the pivotable arm 11 on both sides of the pivot axis of the pivotable arm 11, respectively, for example two swivel wheels 13 being symmetrically arranged on both ends of the pivotable arm. At least two of the rotating wheels 13 are driven wheels, and the rotatable part 2 can apply friction force to the driven wheels to drive the driven wheels to rotate 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 2 during the rotation of the rotatable portion 2, 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 2 by each rotating wheel 13 is automatically distributed, so that a good supporting effect for the rotatable portion can be achieved.

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 part 2 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 2 is mainly different from the structure of the support device 1 that serves the function of supporting the rotatable portion 2 in that: the supporting device 1, which serves the dual function of driving and supporting the rotatable part 2, 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 (as shown in fig. 1B), and at least two rotating wheels 13, the pivotable arm 11 being pivotably connected to the first frame 110 through the pivot 12, the at least two rotating wheels 13 being provided on the pivotable arm 11 and being located on both sides of a 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 2, also has a "teeter-totter" structure, so that the supporting device 1 can also adaptively support the rotatable part 2 during the rotation of the rotatable part 2.

In some embodiments of the utility model, as shown in fig. 4B, at least one support device comprises a pivotable arm 11 and two rotating wheels 13, for the same support device 1, the orthographic projection of the pivot axis 11AX of the pivotable arm 11 and the respective rotation axes 13AX of the two rotating wheels on a first plane being a plane perpendicular to the rotation axis of the rotatable part is substantially on the same line.

According to 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.

With continued reference to fig. 4A and 4B, the at least one support device 1 further comprises a pivot 12, a first bearing 121, a second bearing 132 and a third bearing 133, the pivot 12 being connected to the first frame 110, the pivotable arm 11 being connected to the pivot 12 via the first bearing 121, and the two swivel wheels 13 being connected to the pivotable arm 11 via the second bearing 132 and the third bearing 133, respectively.

That is, the pivotable arm 11 is rotatably supported on the pivot shaft 12 by means of the first bearing 121, and the two rotary wheels 13 can rotatably support the sub-pivotable arm 11 by means of the second bearing 132 and the third bearing 133, 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.

In some embodiments of the utility model, as shown in fig. 2A and 2B, the rotatable part comprises a rotatable body 22 and at least one rotatable track 21, the scanning device 3 is arranged on the rotatable body 22, and the plurality of support devices 1 are at least partially in contact with the at least one rotatable track 21, respectively. Specifically, the plurality of support devices 1 are respectively in contact with the outer peripheral surface portion of at least one rotatable rail 21.

Illustratively, the rotatable part 2 comprises two rotatable tracks 21, between which rotatable body 22 is sandwiched in a direction parallel to the rotational axis AX1 of the rotatable part 2, each of the two rotatable tracks 21 being supported by at least two support means 1, the at least two support means 1 being arranged below the rotatable tracks and on both sides of the rotational axis AX1 of the rotatable part 2.

The rotatable body 22 is sandwiched between the two rotatable rails 21, so that more stable support of the rotatable body 22 can be realized based on a simpler structure, and the center of gravity of the rotating part of the CT apparatus can be conveniently positioned between the two rotatable rails 21, thereby enhancing the 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.

Fig. 5A is a schematic structural view of a magnetic device of a CT apparatus according to an exemplary embodiment of the present utility model. Fig. 5B is a schematic structural view of a magnetic device of a CT apparatus according to another exemplary embodiment of the present utility model. Fig. 5C is a side view of the CT apparatus of fig. 5B.

As shown in fig. 5A to 5C, the CT apparatus 100 further includes: the second rack 120, the second rack 120 is set up opposite to first rack 110; and a plurality of magnetic means, such as a first magnetic means 71 and a second magnetic means 72, provided on at least one of the first frame and the second frame, for providing a magnetic force to the rotatable portion when the rotatable portion is rotated, at least a portion of the component of the magnetic force being in opposition to the direction of the gravitational force of the rotatable portion.

Illustratively, a magnetic device is provided on the second housing 120 for providing magnetic attraction to the rotatable part 2 when it rotates.

For example, as shown in fig. 5B and 5C, the magnetic means includes a first magnetic means 71, the first magnetic means 71 being provided on the second frame 120, the first magnetic means 71 for providing a magnetic attraction force to the rotatable part 2 when the rotatable part is rotated.

Illustratively, a magnetic means is provided on the first housing 110 for providing a magnetic repulsive force to the rotatable part 2 when the rotatable part is rotated.

For example, as shown in fig. 5A, the magnetic means includes a second magnetic means 72, the second magnetic means 72 being provided on the first frame 110, the second magnetic means 72 for providing a magnetic repulsive force to the rotatable part 2 when the rotatable part is rotated.

In some embodiments of the present utility model, the first magnetic means 71 and the second magnetic means 72 may be alternatively arranged, i.e. only one of the first magnetic means 71 and the second magnetic means 72 may be selectively arranged. In other alternative embodiments, the first magnetic means 71 and the second magnetic means 72 may be provided simultaneously, for example, the magnetic means includes a first magnetic means provided on the second frame for providing a magnetic attraction force to the rotatable portion when the rotatable portion rotates and a second magnetic means provided on the first frame for providing a magnetic repulsion force to the rotatable portion when the rotatable portion rotates.

In some embodiments of the utility model, the magnetic means comprise a plurality of permanent magnets or electromagnets arranged on said second frame in a spaced manner from each other in the direction of rotation of the rotatable part.

In some embodiments of the utility model, the magnetic means comprise a plurality of permanent magnets or electromagnets arranged on said second frame in a spaced manner from each other in the direction of rotation of the rotatable part.

In some embodiments of the present utility model, a plurality of permanent magnets or electromagnets are arranged on the second frame at uniform intervals in the rotation direction of the rotatable portion.

For example, a plurality of permanent magnets or electromagnets are arranged on the second frame 120 in a spaced manner from each other in the rotation direction of the rotatable portion 2 (i.e., the circumferential direction of the rotatable portion 2), and have uniform spacing. The rotatable rail 21 of the rotatable portion 2 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 21. 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 21, so that the rotation weight of the rotatable portion 2 can be appropriately reduced, and the radial impact force on the scanning device can be effectively reduced.

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 radial stop for a CT apparatus, the CT apparatus comprising a rotatable portion, the radial stop comprising:

a plurality of support means limiting movement of the rotatable portion in a first radial direction; and

and the radial limiting mechanism is used for limiting the movement of the rotatable part along a second radial direction, and the first radial direction and the second radial direction are along the radial direction of the rotatable part and are opposite to each other.

2. The radial stop of claim 1, wherein the radial stop mechanism comprises a radial eccentric puck that is rotatable, the minimum distance between an outer peripheral surface of the radial eccentric puck and an inner peripheral surface of the rotatable portion being variable in a second radial direction during rotation of the radial eccentric puck.

3. The radial stop of claim 1, wherein the radial stop mechanism comprises a radial pinch roller that is rotatable, and wherein a minimum distance between an outer peripheral surface of the radial pinch roller and an inner peripheral surface of the rotatable portion in a second radial direction remains unchanged during rotation of the radial pinch roller.

4. The radial stop of claim 2, wherein the CT apparatus comprises a first gantry, the rotatable portion comprising a rotatable track; the radial eccentric pinch roller comprises a wheel seat, a wheel shaft, a wheel bearing and a first radial pinch roller element, wherein the wheel seat is fixedly connected with the first frame, the wheel shaft is arranged on the wheel seat, the first radial pinch roller element is arranged on the wheel shaft through the wheel bearing, an eccentric amount is arranged between the central axis of the first radial pinch roller element and the central axis of the wheel shaft, the first radial pinch roller element can eccentrically rotate on the wheel shaft, and at least one part of the outer peripheral surface of the first radial pinch roller element faces the inner peripheral surface of the rotatable track.

5. The radial stop of claim 3, wherein the CT apparatus comprises a first gantry, the rotatable portion comprising a rotatable track; the radial pinch roller comprises a wheel seat, a wheel shaft, a wheel bearing and a second radial pinch roller element, the wheel seat is fixedly connected with the first frame, the wheel shaft is arranged on the wheel seat, the second radial pinch roller element is arranged on the wheel shaft through the wheel bearing, the central axis of the second radial pinch roller element coincides with the central axis of the wheel shaft, the second radial pinch roller element can rotate on the wheel shaft, and at least one part of the outer peripheral surface of the second radial pinch roller element faces the inner peripheral surface of the rotatable track.

6. The radial stop of claim 4, wherein said radial eccentric puck includes two of said wheel axles, two of said wheel bearings, and two of said first radial puck elements,

the central axes of the two wheel shafts are located at the same level.

7. The radial stop of claim 5, wherein said radial pinch roller comprises two of said wheel axles, two of said wheel bearings, and two of said second radial pinch roller elements,

the central axes of the two wheel shafts are located at the same level.

8. The radial stop of any one of claims 1-7, wherein at least one of the support means comprises a pivotable arm pivotally connected to a gantry of the CT apparatus and at least two rotating wheels provided on the pivotable arm on either side of a pivot axis of the pivotable arm, respectively, the at least two rotating wheels for supporting the rotatable portion.

9. A CT apparatus, characterized in that the CT apparatus comprises a radial stop as claimed in any of the claims 1-8.

10. The CT apparatus according to claim 9, wherein the rotatable portion includes a rotatable body and 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 two rotatable tracks are annular tracks, and the radial limiting mechanism faces the inner peripheral surface of at least one annular track.