CN1779446B - Rotary device of container checking system with CT fault scanning function - Google Patents

Abstract

A rotation device with CT fault scanning function of container detection system is prepared as fixing radiation source and calibrator just facing to said source on external side of circular rotation frame; fixing front collimator, back collimator, detector array on internal side of circular rotation frame and enabling sector X ray to pass through front collimator, appliance, container detection vehicle then to face just to back collimator and detector array; hinging circular rotation frame on circumnavigation frame fixed on ground to let circular rotation frame rotate synchronously around a fixed center by utilizing a driving device.

Description

A rotating device of a container inspection system with CT tomographic scanning function

technical field

The invention relates to a large-scale container inspection system used by customs, in particular to a rotating device of the container inspection system with CT tomographic scanning function.

Background technique

In the prior art, since the beginning of the 1990s, drag-type container detection systems have come out, such as the large-scale container detection systems produced by Heyman and British Aerospace. They are installed in a radiation-shielding inspection channel, equipped with a fixed radiation source that can generate high-energy X-rays and an array detector that can receive X-rays passing through the container. The container vehicle is dragged through the detection channel. When the container passes through the X-ray beam, the X-rays that pass through the container penetrate into the detector. According to the intensity change, the density distribution of the objects contained in the box is reflected, and the ray intensity is transformed into The gray scale of the image can be used to obtain the perspective image of the object contained in the box. Chinese patent ZL95103044.2 discloses a kind of title " self-scanning type large object radiation detection system ", and this system comprises radiation source, collimating tower, track and scanning gantry. The radiation source moves reciprocatingly on the track, and the alignment tower and the detection tower are placed on another set of tracks, and together with the radiation source, they are driven by the servo motor to move synchronously. The large object to be measured is placed between the track of the collimation tower and the track of the detection tower. The rays from the radiation source pass through the collimation tower, pass through the container, and then enter the array detector of the detection tower. The detector receives the rays and outputs charges, which are transformed into digital After transmission to the image workstation, the perspective image of the object in the box can be obtained.

The above-mentioned X-ray radiation imaging inspection system currently in use, because its detection devices are all fixedly installed, usually there is only one direction of relative movement relative to the detected object, so it can only obtain a radiation projection image at one angle, and cannot obtain the detected object in a certain direction. Tomographic images of parts, which to some extent limit the accuracy of cargo inspection of complex items.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a turning device of a container inspection system with a CT tomographic scanning function. The container inspection system formed by using it can not only achieve routine inspection of the detected object, but also implement fault inspection on suspicious parts of the detected object, so as to more effectively improve the accuracy of inspection of prohibited goods.

In order to achieve the above-mentioned purpose of the invention, the technical solution of the present invention is realized in the following manner:

A rotary device of a container inspection system with a CT tomographic scanning function, which includes a radiation source, a corrector, a front collimator, a rear collimator, a detector array and an annular rotating frame that allows a container inspection vehicle to pass through. Its structural feature is that the outer side of the annular rotating frame fixes the radiation source and the corrector facing the radiation source, and the inner side of the annular rotating frame fixes the front collimator, rear collimator and The detector array allows the fan-shaped X-rays emitted by the radiation source to pass through the rectifier, the front collimator, and the back of the container inspection vehicle to face the rear collimator and the detector array. The annular rotating frame is hinged with the fixed annular frame body on the ground, and the driving device makes the annular rotating frame rotate synchronously around a fixed center, and the braking device makes the annular rotating frame stop.

In the above-mentioned slewing device, the driving device is composed of a motor, a reducer, a spur gear, and an external ring gear. The motor outputs power through the reducer, and the output shaft of the reducer is connected to the spur gear, and the external teeth meshing with the spur gear The ring is fastened on the outer wall of the ring-shaped rotating frame, and the rotation angle range of the outer ring gear is within 236 degrees to prevent interference with the radiation source and corrector installed outside the ring-shaped rotating frame.

In the above-mentioned slewing device, the braking device is driven by a rolling cylinder, and a braking brake is provided on the outer wall of the circular rotating frame, and the braking brake is controlled by a rolling cylinder fixed to the ground.

In the aforementioned rotary device, the radiation source is a linear electron accelerator or an isotope.

The rotary device provided by the present invention, since the radiation source, the front collimator, the rear collimator and the detector array are all fixed in the rotatable circular rotating frame, when the transmission device drives the container detection vehicle through the circular While rotating the frame, it is possible to carry out routine inspection of the detected object. When the detected object is found to contain suspicious items, the transmission device can be moved back, and the suspicious part can be moved back to the circular rotating frame. This position is exactly the gap of the transmission device, so that the inspected items are not blocked during the scanning process. . Then, start the ring-shaped rotating frame to perform CT tomographic scanning on suspicious parts, so as to make the inspection results more accurate. Compared with the prior art, the present invention has the advantages of reasonable design, convenient use, easy maintenance and reduced occupied area.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a structural installation schematic diagram of the present invention;

Fig. 2 is the A-A direction view of Fig. 1;

Fig. 3 is a use state diagram of the present invention.

Detailed ways

Referring to Fig. 1 and Fig. 2, the present invention comprises the radiation source 1 that adopts linear electron accelerator or isotope, corrector 2, front collimator 3, rear collimator 6, detector array 5 and the circular circle that can make container inspection vehicle pass through Ring rotating frame 4. The outer side of the circular rotating frame 4 fixes the radiation source 1 and the corrector 2 facing the radiation source 1, and the inner side of the circular rotating frame 4 fixes the front collimator 3, the rear collimator 6 and the detector array 5 and make the fan-shaped X-rays emitted by the radiation source 1 pass through the rectifier 2, the front collimator 3, the rear collimator 6 and the detector array 5 facing the rear of the container inspection vehicle. The annular rotating frame 4 is hinged with the fixed annular frame body 10 on the ground, and the driving device 8 makes the annular rotating frame 4 rotate synchronously around a fixed center, and the braking device 12 makes the annular rotating frame 4 Can be stopped. The braking device 12 is driven by a rolling cylinder, and the outer wall of the circular rotating frame 4 is provided with a braking brake 13, which is controlled by a rolling oil cylinder 14 fixed to the ground. Driving device 8 is made up of motor, speed reducer, spur gear, outer ring gear. The motor outputs the power through the reducer, the output shaft of the reducer is connected with the spur gear, and the outer ring gear meshed with the spur gear is fastened on the outer wall of the circular rotating frame 4, and the rotation angle range of the outer ring gear is within 236 degrees. In order to prevent interference with the radiation source 1 and the corrector 2 installed outside the circular rotating frame 4 .

The usage method of the container inspection system formed by the present invention is that, under the control of the remote control device, the conveying device 7 carries the container inspection vehicle through the circular rotating frame 4 for routine scanning inspection. When it is found that there are suspicious items in the container detection car, the control transmission device 7 is moved backward, the suspicious part in the container detection car is moved to the ring-shaped rotating frame 4 to stop, and the stop of the brake device 12 to the ring-shaped rotating frame 4 is released. move. Start the ring carousel

4 rotations, CT tomographic scanning of suspicious parts. After the inspection is completed, the braking device 12 decelerates the circular rotating frame 4 until it stops at a designated position. The driver drives the container inspection vehicle out of the scanning channel and waits for the inspection result. At this time, the inspection of the next container inspection vehicle can be continued.

Claims (3)

1. A rotary device of a container inspection system with CT tomography function, which includes a radiation source (1), a corrector (2), a front collimator (3), a rear collimator (6), and a detector array (5) and the annular rotating frame (4) that can make the container detection vehicle pass through, it is characterized in that, the outer side of the described annular rotating frame (4) is fixed to the radiation source (1) and is facing the radiation source The corrector (2) of (1), the inner side of the annular rotating frame (4) fixes the described front collimator (3), rear collimator (6) and detector array (5) and makes the radiation source (1) The fan-shaped X-rays emitted pass through the corrector (2), the front collimator (3), the rear collimator (6) and the detector array (5) facing the container inspection vehicle, and the circular ring rotates The frame (4) is hinged with the ring frame body (10) fixed on the ground, and the circular rotating frame (4) can be rotated synchronously around a fixed center by the driving device (8), and the circular ring frame can be rotated synchronously by the braking device (12). Shaped rotating frame (4) can be stopped, and described driving device (8) is made up of motor, speed reducer, spur gear, outer ring gear, and motor outputs power through speed reducer, connects spur gear on the speed reducer output shaft, and The outer ring gear meshed with the spur gear is fastened on the outer wall of the ring-shaped rotating frame (4), and the rotation angle range of the outer ring gear is within 236 degrees to prevent the radiation source installed outside the ring-shaped rotating frame (4) (1) and calibrator (2) interfere. 2. The slewing device according to claim 1, characterized in that, the brake device (12) is driven by a hydraulic cylinder, and a brake (13) is provided on the outer wall of the annular rotating frame (4). Brake (13) is controlled by hydraulic oil cylinder (14) fixed with ground. 3. The rotary device of the container inspection system with CT tomography function according to claim 1 or 2, characterized in that the radiation source (1) is a linear electron accelerator or an isotope.

Images