CN112882117A - Container CT system - Google Patents
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- CN112882117A CN112882117A CN202110349943.5A CN202110349943A CN112882117A CN 112882117 A CN112882117 A CN 112882117A CN 202110349943 A CN202110349943 A CN 202110349943A CN 112882117 A CN112882117 A CN 112882117A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
- G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
- G01V5/226—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays using tomography
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Abstract
本发明公开了一种集装箱CT系统，包括安装在地基上的CT检测单元；所述CT检测单元包括环形回转支架和支撑所述环形回转支架的支撑底座；所述CT检测单元的重心在所述支撑底座的竖直投影面内；环形回转支架安装有两套射线源单元和探测器阵列单元，两个所述射线源单元射线扇面的中心正交。本发明集装箱CT系统通过将CT检测单元中的环形回转支架的重心在所述支撑底座的竖直投影面内；系统流程简单效率高，最大限度减少了设备的倾覆力矩，从而降低了设备的尺寸，减轻了设备的重量。
The invention discloses a container CT system, comprising a CT detection unit installed on a foundation; the CT detection unit comprises an annular slewing support and a support base supporting the annular slewing support; the center of gravity of the CT detection unit is in the In the vertical projection plane of the support base; the annular rotary support is installed with two sets of ray source units and detector array units, and the centers of the ray fans of the two ray source units are orthogonal. The container CT system of the present invention locates the center of gravity of the annular rotating support in the CT detection unit in the vertical projection plane of the support base; the system process is simple and efficient, and the overturning moment of the equipment is minimized, thereby reducing the size of the equipment , reducing the weight of the device.
Description
Technical Field
The invention relates to the field of nuclear technology application, in particular to a digital radiation imaging detection technology for large objects such as containers, vehicles and the like.
Background
The container radiation imaging inspection system using an accelerator and a radioactive isotope as a radiation source meets the requirements of customs or port detection to a certain extent, but has the following defects in performance: only one or two directions of projection images of the detected object are given, and the projection directions and the number of the projection images are not changed after the projection images are built, so that a tomographic image and related data thereof cannot be given.
Chinese patent ZL99110839.6 proposes the use of a radioisotope radiation source60Co or137Cs) container DR/CT inspection system, including a fixed support, rotating frame and dragging mechanism, can obtain the projected image (DR) of the arbitrary set direction of object to be detected by once dragging and scanning to the object to be detected stops in a certain position, can obtain the tomogram (CT) and relevant data of the corresponding position through the rotatory a week of annular rotating support, provide the detailed basis for judging the goods.
The device described in patent ZL99110839.6 of the above invention includes an annular frame for mounting the radiation source and the array detector, when acquiring projection images of the object to be detected in other directions, the position needs to be switched rotationally and a large object to be detected needs to reciprocate, which significantly reduces the detection efficiency (throughput), the rotating annular frame mounts the radiation source and the array detector, because of the existence of the cantilever tipping moment, the frame fixing support is bulky, which results in heavy equipment and large occupied area, for example, for a CT system of an air container, the outer diameter of the equipment is up to 5 meters, and for a truck with a width of 2.5 meters and a height of 4.5 meters, the occupation of the annular frame has to reach a diameter range of nearly 10 meters.
Disclosure of Invention
The invention aims to provide a container CT system which has novel and unique structure and convenient use and can effectively reduce the occupied area of equipment and the weight of the whole machine; the specific technical scheme is as follows:
a container CT system comprises a CT detection unit installed on a foundation; the CT detection unit comprises an annular rotary support and a support base for supporting the annular rotary support; the gravity center of the CT detection unit is positioned in the vertical projection plane of the support base; the annular rotary support is provided with two sets of ray source units and detector array units, and the centers of ray fan surfaces of the two ray source units are orthogonal.
Further, the distance between the center of gravity of the CT detection unit and the center of the vertical projection plane of the support base is less than 10% of the short side of the vertical projection plane.
Furthermore, the two sets of the ray source units and the detector array units are symmetrically arranged along the central axis direction of the annular rotary support; the center of gravity of the CT detection unit coincides with the center of the vertical projection plane of the support base.
Furthermore, the left end and the right end of the supporting base are both provided with supporting supports for supporting the annular rotary support.
Further, at least one of the support brackets is provided with a self-aligning structure.
Further, the radiation source unit comprises a radiation source and a front collimator; the detector array unit comprises a rear collimator and a detection array; and rays of the ray source enter the detector array after passing through the front collimator and the rear collimator.
Further, the first overturn prevention bracket is used for preventing the CT detection unit from overturning; the first anti-overturning support is arranged on the top of the frame spanning the front side and the rear side of the annular rotary support and matched with the anti-overturning grooves in the top of the annular rotary support.
Further, the CT detection device also comprises a second overturn prevention bracket for preventing the CT detection unit from overturning; the end face of the outer edge of the annular rotary support is provided with an anti-overturning groove, and the second anti-overturning support is installed on the supporting base and matched with the anti-overturning groove at the bottom of the annular rotary support.
Furthermore, the central included angle of the ray fan surfaces of the two sets of ray source units is 80-100 degrees.
The container CT system of the invention is characterized in that the gravity center of an annular rotary bracket in a container CT detection unit is positioned in the vertical projection plane of a supporting base; the overturning moment of the equipment is reduced to the maximum extent, so that the size of the equipment is reduced, and the weight of the equipment is reduced. Because of the obvious advantages of the invention, compared with the prior art, the rotary equipment has small diameter and light weight, and is particularly suitable for detection of air containers, pallet trains, customs containers, trucks, high-speed trains and the like, or can be made into a vehicle-mounted CT system for multi-place remote detection.
Drawings
FIG. 1 is a schematic view of the detection principle of the container CT system of the present invention;
FIG. 2 is a schematic structural diagram of a container CT detection unit according to the present invention;
FIG. 3 is a schematic structural view of a container CT detection unit of the present invention (with the outer shell removed);
FIG. 4 is a schematic structural view of an annular rotating support structure;
FIG. 5 is an enlarged view of a portion of FIG. 4;
fig. 6 is a schematic structural view of the supporting unit.
In the figure: 1. a foundation; 2. A container CT detection unit; 21. a top cover; 22. a housing; 23. an annular rotating support; 231. a radiation source; 232. a front collimator; 233. a post-collimator; 234. a detection array; 235. a power ring; 236. gear teeth; 24. A support base; 241. a support roller; 242. a drive shaft; 243. a driving gear; 25. a first anti-toppling bracket; 26. a second anti-toppling bracket; 261. a bearing; 3. And (5) detecting the object.
Detailed Description
The present invention will now be more fully described with reference to the following examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.
For ease of description, spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 3, the container CT system in the present embodiment includes a container CT detection unit 2 mounted on a foundation 1; the container CT detection unit 2 comprises an annular rotary support 23 provided with a ray source unit and a detector array unit, and a support base 24 for supporting the annular rotary support 23; the gravity center of the container CT detection unit 2 is arranged in the vertical projection plane of the supporting base 24; the normal rotation of the annular slewing bearing 23 can be realized without the support of a large bearing.
The container CT detection unit 2 is also provided with an outer cover 22 and a top cover 21; foreign matter is prevented from entering the apparatus.
The center of gravity of the container CT-detection unit 2 is as close as possible to the center of the vertical projection plane of the support base 24; at least the distance from the center of the vertical projection plane of the supporting base should be less than 10% of the short side of the vertical projection plane. The vertical projection plane is generally rectangular, and the direction of the short side is generally parallel to the rotation center axis of the circular rotating bracket 23.
As shown in fig. 4, in order to realize that the center of gravity of the annular rotary support 23 is as close to the center of the vertical projection plane of the support base 24 as possible, the annular rotary support 23 is designed to be a symmetrical structure; the two sets of ray source units and the detector array units are respectively arranged on two end faces of the annular rotary bracket 23 along the central shaft direction; the annular rotary support 23 rotates once, two sets of scanning images can be obtained, and the detection efficiency is obviously improved. The centers of ray sectors of the two ray source units can be parallel; the included angle is 80 to 100 degrees, and can be observed from two directions simultaneously; preferably, the center of the ray fan of one of the ray source units is horizontally arranged, the other one is approximately vertically arranged, and two projection images in the horizontal direction and the vertical direction can be obtained by the object 3 to be detected through one time. Projection images are obtained from two directions, comparison is easier, and abnormal objects are found.
As shown in fig. 6, in order to reduce the height of the apparatus, the left end and the right end of the support base are provided with support brackets for supporting the annular rotating bracket.
In order to balance the stress of the supporting roller of the supporting bracket, simplify the positioning adjustment and prolong the service life of the supporting bracket and the supporting roller; at least one of the supporting brackets is provided with a self-aligning structure; and (3) enabling as many supporting rollers as possible to be in contact with the wheel rim of the annular rotary support to support the annular rotary support. Of course, the support brackets at the two ends can be set to be self-aligning support structures, and the self-aligning support structures also have the overturn-preventing positioning function.
The annular rotary support can be in contact with the rim of the annular rotary support by adopting a friction wheel, and the annular rotary support is driven to rotate by utilizing the friction wheel. Or the rim of the annular rotary bracket can be provided with teeth, and the annular rotary bracket is driven to rotate by a gear or a synchronous toothed belt.
The rim of the annular rotary support can be provided with a groove, two power rings 235 are arranged in the groove, and the two power rings are respectively connected with the power input end to provide power for the detector array. The power ring and the power input end can be connected in a mode of adopting a brush adopted by a direct current click rotor. The power ring should be insulated from the annular rotating support. As shown in fig. 6, the motor drives the driving shaft 242 to rotate the driving gear 243 on the driving shaft 242, and the timing belt is engaged with the gear teeth 236 in fig. 5 to rotate the annular rotary bracket. When necessary, a tension wheel can be arranged to improve the friction force between the synchronous toothed belt and the gear teeth and avoid losing rotation. When the synchronous cog belt is used for driving, the front side or the rear side wall of the supporting bracket can be detached, so that the installation of the annular synchronous cog belt is facilitated.
Wherein the radiation source unit includes a radiation source 231 and a front collimator 232; the detector array unit comprises a post-collimator 233 and a detection array 234; rays of the radiation source enter the detection array 234 after passing through the front collimator 232 and the rear collimator 233. The equipment adopts a radioactive isotope wide-angle ray source; the fan angle generated by the ray can exceed 120 degrees; thus, the arc of the post-collimator 233 and the detection array 234 may also exceed 120 °; the diameter of the annular rotating support 23 can be reduced; further reducing the weight of the apparatus. For a truck with the width of 2.5 meters and the height of 4.5 meters, the occupation of the annular support only needs to reach the diameter range of 7.6 meters; the total weight of the apparatus does not exceed 10 tons.
In order to prevent the CT detection unit from overturning, the system is provided with a first overturn prevention bracket 25; the end face of the outer edge of the annular rotary support 23 is provided with an anti-overturning groove, and the first anti-overturning support 25 is mounted at the top of the frame spanning the front side and the rear side of the annular rotary support and matched with the anti-overturning groove at the top of the annular rotary support 23; so that the top of the annular rotating bracket 23 does not deflect back and forth.
In addition, the system is also provided with a second overturn preventing bracket 26; the second overturn-preventing bracket 26 is arranged on the supporting base 24 and is matched with the overturn-preventing groove at the bottom of the annular rotary bracket 23; so that the bottom of the annular rotating bracket 23 does not deflect back and forth.
The second overturn preventing bracket 26 is in contact with the front side wall and the rear side wall of the overturn preventing groove through a bearing positioning wheel 261; the rotational resistance of the annular slewing bracket 23 is reduced.
The invention comprises an annular rotary support 23 and a fixed support, two sets of wide-angle ray source devices, a front collimator 232, a rear collimator 233 and an array detector are respectively arranged on two end faces of the annular rotary support 23, and the invention also comprises a bidirectional translation dragging mechanism and a signal processing system, wherein two sets of ray measuring systems (the ray source devices, the front collimator, the rear collimator and the array detector) are respectively arranged on the two end faces of the annular rotary support, one set of the ray source device is positioned under the annular rotary support 23 to obtain an upward projection image of an object 3 to be detected, and the other set of the ray source device obtains a horizontal projection image of the object 3 to be detected. After the projection images in the two directions are acquired, if the tomographic image at a certain position is needed as an image result, the object to be detected is retracted to the specified position, and the annular rotating support 23 rotates for one circle to acquire the tomographic image at the certain position.
If a spiral CT image of the object to be detected 3 needs to be acquired, firstly, the distance between the two sets of wide-angle ray source devices and the detection surface of the array detector device is arranged to be odd times of the pixel size, so that the object to be detected translates twice according to each revolution of the annular support, the spiral CT paths scanned by the two sets of ray measurement systems are not overlapped, and the time consumption is reduced by one time compared with a single-layer spiral CT system.
The annular rotary support 23 can realize 360-degree rotation on the fixed support, the support base 24 supported below the annular rotary support is positioned in a pit below the earth surface, the fixed support is composed of two support assemblies, each support assembly is formed by two support rollers on a self-aligning support and the annular rotary support 23 in contact, the self-aligning support is fixed on the support base 24, and the load of the annular rotary support 23 is guaranteed to be uniformly supported on the four support rollers 241 of the two support assemblies. A gear drive, a friction roller drive, may be employed to drive the rotation of the annular rotating support 23. The power supply of the detection unit is connected with a power supply ring on the annular rotary bracket 23 through an electric brush; the signal of the detection unit can be connected with the control unit in a wireless mode.
The source of isotope radiation may be60Co、137Se、192Ir, the wide angle radiation source device that the nuclear energy of the university of qinghua and new forms of energy technical research institute developed can be adopted to radiation source working container, and the slice is restrainted the beam angle and can be reached the more than 120 single-deck array detector as required, if use multilayer array detector, then can superpose the increase as required with fan-shaped bundle of rays plane vertical direction's angle.
The array detector can select a high-pressure gas ionization chamber, a solid detector and a multi-wire proportional chamber.
The surface of the translation dragging mechanism is at the height position of the ground, so that the object 3 to be detected can be translated through the annular rotary support, the translation dragging mechanism can be in the forms of an AGV trailer, an automatic driving truck and the like, and a direct fast detection mode for avoiding a vehicle head can also be adopted.
The invention overcomes the problems of the existing container detection system, and provides a DDR/CT (double data Rate/computed tomography) inspection system for a container, wherein a radioactive isotope wide-angle ray source device and an annular layout array detector taking a rotation center as a circle center are respectively arranged on the end surfaces of two sides of an annular rack, an object to be inspected 3 moves forwards, and two orthogonal projection images (DDR) in two directions are obtained by one-time dragging and scanning. Under the condition of need, the object 3 to be detected can be withdrawn to a specified position, the annular rotary support 23 rotates to make a tomographic image of the object 3 to be detected, and also can make a spiral CT image of the detected object, and when the image is projected in a double perspective manner compared with the original system, because the two end faces are completely symmetrical in load, the fixed support is not subjected to tilting moment, the structure is simplified, the supporting operation can be realized without a large-scale bearing, and because the wide-angle ray source device and the array detector are distributed along the circumference of the rotary ring, the device can be greatly reduced from the weight to the occupied area compared with the prior art.
The above examples are only for illustrating the present invention, and besides, there are many different embodiments, which can be conceived by those skilled in the art after understanding the idea of the present invention, and therefore, they are not listed here.
Claims (10)
1. A container CT system comprises a CT detection unit installed on a foundation; the CT detection device is characterized in that the CT detection unit comprises an annular rotary support and a support base for supporting the annular rotary support, and two sets of ray source units and detector array units are arranged in front of and behind the annular rotary support; the gravity center of the CT detection unit is arranged in the vertical projection plane of the supporting base.
2. The shipping container CT system of claim 1, wherein the center of gravity of the CT detection unit is less than 10% of the short side of the vertical projection plane from the center of the vertical projection plane of the support base.
3. The container CT system according to claim 2, wherein two sets of said radiation source units and detector array units are symmetrically disposed along a central axis direction of said annular rotary support; the center of gravity of the CT detection unit coincides with the center of the vertical projection plane of the support base.
4. The container CT system of claim 1, wherein the support base is provided at both left and right ends with support brackets for supporting the annular rotating bracket.
5. The container CT system of claim 3, wherein at least one of said support brackets has a self-aligning configuration.
6. The container CT system of claim 1, wherein the radiation source unit comprises a radiation source and a pre-collimator; the detector array unit comprises a rear collimator and a detector array; and rays of the ray source enter the detector array after passing through the front collimator and the rear collimator.
7. The container CT system of claim 1, further comprising a first anti-tip-over bracket to prevent the CT detection unit from tipping over; the first anti-overturning support is arranged on the top of the frame spanning the front side and the rear side of the annular rotary support and matched with the anti-overturning grooves in the top of the annular rotary support.
8. The container CT system of claim 1, further comprising a second anti-tip-over bracket to prevent the CT detection unit from tipping over; the end face of the outer edge of the annular rotary support is provided with an anti-overturning groove, and the second anti-overturning support is installed on the supporting base and matched with the anti-overturning groove at the bottom of the annular rotary support.
9. The container CT system of claim 1, wherein the central angle of the ray fans of the two sets of said ray source units is 80 to 100 degrees.
10. The container CT system of claim 9, wherein the central angle of the ray fans of the two sets of said ray source units is 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110349943.5A CN112882117A (en) | 2021-03-31 | 2021-03-31 | Container CT system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110349943.5A CN112882117A (en) | 2021-03-31 | 2021-03-31 | Container CT system |
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| CN112882117A true CN112882117A (en) | 2021-06-01 |
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| CN202110349943.5A Pending CN112882117A (en) | 2021-03-31 | 2021-03-31 | Container CT system |
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2021
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| CN1708686A (en) * | 2002-10-02 | 2005-12-14 | 显示成像技术有限公司 | Folded array CT baggage scanner |
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