CN104316547B - Rotary arc detector box for X-ray testing device - Google Patents

Abstract

The invention discloses a rotating arc-shaped detector box for X-ray inspection equipment, which is characterized in that it comprises an arc-shaped detector integrated block and a rotating mechanism for rotating the rotating arc-shaped detector; The opening of the arc-shaped detector integrated block faces the radiation source of the X-ray machine, and the arc-shaped detector is fixed on the rotary shaft on the side away from the opening, so that the arc-shaped detector integrated block moves along the The rotary shaft rotates around the center, and the rotary mechanism is arranged on a side away from the opening of the arc-shaped detector integrated block. The invention can solve the problems of the difference of the indexes of the two channels, the inconsistency of the deformation processing of the image, the simplification of the geometric correction and the like. In the present invention, a plurality of detector crystals are installed side by side, which has a better effect in reducing scattering and improving wire resolution.

Description

A rotating arc detector box for X-ray inspection equipment

technical field

The invention relates to a rotating arc detector box, in particular to a rotating arc detector box used for X-ray inspection equipment, and belongs to the technical field of object safety detection.

Background technique

X-rays are often used for security inspection of items, for example to identify prohibited items in luggage, packages or containers. X-ray imaging detection equipment is one of the necessary detection methods used in airports, stations, docks, conferences, exhibitions and other occasions. In the process of security inspection, relative movement between the item to be inspected and the X-ray source and detector is required, and the detection device can actively detect and display the image of the passing item. For this reason, the current X-ray security inspection system works in two ways: the first one is that the radiation source and detector are not fixed during the security inspection operation, and the scanning of the inspected item is realized through the movement of the radiation source and detector. This situation is often realized through the vehicle safety inspection system. The second is that the radiation source and detector are stationary during the security inspection operation, and the inspected items can move through the radiation scanning area to complete the scanning, such as the baggage security inspection system. In order to obtain better scanning image quality, the radiation source and the detector are often fixed during the security inspection operation.

A general imaging system mainly includes the following parts. The X-ray machine generates stable X-rays through the ray generating device; the front collimator is placed at the front end of the X-ray beam to adjust the scanning range of the X-rays; the rear collimator: the range where the X-rays reach the receiving area Perform alignment. The detector array receives the X-rays emitted by the X-ray machine. Its main working principle is: the X-rays emitted by the X-ray machine pass through the items that the front collimator penetrates, then pass through the rear collimator, and finally the detector receives the penetrated rays and converts them into electrical signals, which are processed to form images and then Shows the internal shape of the item.

The existing X-ray inspection equipment is mainly the linearity of the L-shaped detector box and the side-illuminated X-ray machine layout. The distance between the linear detector and the optical machine target point varies greatly, and the far and near detection is often carried out in terms of algorithms and physics. Image processing of the device. There are often problems such as low resolution and poor image effects.

Contents of the invention

The technical problem to be solved by the present invention is to provide a rotating arc detector box for X-ray inspection equipment.

In order to achieve the above-mentioned purpose of the invention, the present invention provides a rotary arc detector box for X-ray inspection equipment, including: an arc detector integrated block and a rotating mechanism for rotating the arc detector ;

The opening of the arc-shaped detector integrated block faces the radiation source of the X-ray machine, and the arc-shaped detector is fixed on the rotary shaft on the side away from the opening, so that the arc-shaped detector integrated block Rotating along the rotation axis as the center, the rotating mechanism is arranged on a side away from the opening of the arc-shaped detector manifold and connected with the arc-shaped detector manifold.

Preferably, the arc-shaped detector integrated block is fixed on the rotary shaft through a rotary support with holes, the holes on the rotary support fit on the rotary shaft, and the support It is fixed on the side of the arc-shaped detector integrated block away from the opening.

Preferably, the rotating mechanism is one of an electric push rod device, a hydraulic push rod device, and a pneumatic push rod device.

Preferably, the rotating mechanism is an electric push rod device, and the electric push rod device includes a connecting rod that automatically expands and contracts through energization, and the electric telescopic rod includes two ends, one of which is fixed on the X On the radiographic inspection equipment, the other end is connected to the traction shaft on the side of the arc-shaped detector integrated block away from the opening, and there is a sufficiently large distance between the traction shaft and the rotary shaft.

Preferably, one end of the telescopic rod of the electric push rod device is fixed on the X-ray inspection equipment through a rotating shaft.

Wherein preferably, a plurality of detector crystals are arranged on the arc of the arc-shaped detector integrated block.

Preferably, the line connecting the center of the detector crystal and the target point is perpendicular to the tangent between the detector crystal and the arc.

Wherein preferably, the plurality of detector crystals are within a certain angular range, and adjacent detector crystals are installed side by side and arranged equidistantly from the emission source target.

Wherein preferably, the plurality of detector crystals are within a certain opening angle range, and the gap between two adjacent detector crystals is not greater than 0.5mm, so that the radiation does not scatter.

Preferably, two sets of reference positioning devices are arranged on both sides of the rotating arc-shaped detector box, and the reference positioning devices are detector reference blocks with proximity sensors.

The invention provides a rotating arc detector box for X-ray inspection equipment. It can solve problems such as the difference of two-channel indicators, the inconsistency of image deformation processing, and the simplification of geometric correction. In the present invention, a plurality of detector crystals are installed side by side, which has a better effect in reducing scattering and improving wire resolution.

Description of drawings

Fig. 1 is a structural schematic diagram of a rotary arc detector box of the present invention;

Fig. 2 is a structural schematic diagram of the integrated block of the rotating arc-shaped detector box and the arc-shaped detector of the present invention;

Fig. 3 is a structural schematic diagram of the rotary mechanism of the rotary arc detector box of the present invention;

Fig. 4 is a schematic diagram of the working state of the left channel of the rotary arc detector box of the present invention;

Fig. 5 is a schematic diagram of the working state of the right channel of the rotary arc detector box of the present invention.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figure 1, the present invention provides a rotating arc detector box for X-ray inspection equipment, including an arc detector manifold 1 and a rotating mechanism for rotating the rotating arc detector box; The opening of the detector integrated block 1 faces the radiation source 3 of the X-ray machine, and the arc-shaped detector is fixed on the rotary shaft 10 on the side away from the opening, so that the arc-shaped detector integrated block rotates around the rotary shaft 10, The rotating mechanism is arranged on a side away from the opening of the arc-shaped detector manifold 1 and connected with the arc-shaped detector manifold 1 . The rotating arc detector box provided by the present invention will be described in detail below.

As shown in Figure 1, the arc-shaped detector integrated block 1 is fixed on the rotary shaft 10 through the rotary support 11 with holes, the holes on the rotary support 11 fit on the rotary shaft 10, and the rotary support 11 is fixed on the The arc-shaped detector integrated block is away from the side of the opening.

As shown in Figure 1, Figure 3 to Figure 5, the rotating mechanism of the rotating arc detector box is the electric push rod device 2, the electric push rod device 2 includes a connecting rod 20 that automatically expands and contracts through power-on, and the electric telescopic rod includes two ends One end of which is fixed on the X-ray inspection equipment, and the other end is connected to the traction shaft 22 on the side of the arc-shaped detector integrated block away from the opening. There is a large enough gap between the traction shaft 22 and the rotary shaft 10. distance. The torque of the electric telescopic rod 2 on the arc-shaped detector integrated block 1 is large enough to make the arc-shaped detector integrated block rotate along the rotary shaft 10 . In order to further improve the flexible rotation of the rotating arc detector box when the electric push rod device 2 is telescopic, one end of the telescopic rod of the electric push rod device 2 is fixed on the X-ray inspection equipment through the rotating shaft 21 . When the electric telescopic rod stretches, the electric push rod device 2 also rotates along the rotation axis. It should be noted here that, in the present invention, the rotating mechanism is not limited to the electric push rod device 2, and any device that can make the arc-shaped detector manifold rotate along the rotary shaft 10 can realize the present invention (for example, a hydraulic device, a pneumatic device, etc.) , gears, sprockets and other transmission mechanisms.).

As shown in FIG. 2 , a plurality of detector crystals 5 are arranged on the arc of the arc-shaped detector integrated block 1 . The line connecting the center of the detector crystal 5 and the target point is perpendicular to the tangent between the detector crystal 5 and the arc. The energy receiving effect is best when the connection line between the center of each detector crystal 5 and the target point is perpendicular to the tangent line between the corresponding detector crystal 5 and the arc. A plurality of detector crystals 5 are within the range of a certain opening angle of the radiation source 3 rays of the X-ray machine, adjacent detector crystals are installed side by side and arranged equidistantly from the emission source target, and the distance between adjacent detector crystals is The setting of not more than 0.5mm effectively reduces the scattering problem of rays compared with the L-shaped detector box. Multiple detector crystals 5 adopt a structure installed side by side, which has a better effect in reducing scattering and improving wire resolution. In addition, the detector crystals 5 are installed side by side, the theoretical gap is very small, there is no spatial reflection of rays, and the scattering of edge rays can be effectively reduced.

As shown in Figures 1 to 4, two sets of reference positioning devices are arranged on both sides of the arc-shaped detector integrated block 1. In terms of structural design, the rotating arc-shaped detector box is modularized, and the detector crystal 5 and its The mounting plate is made into a module for overall adjustment. Before installation, each detector crystal 5 is aligned with the alignment seam with the help of an open area such as an external platform, and is adjusted in the same reference plane, that is, the references of each detector crystal 5 are consistent and relative to each other. The location is the same. This operation is simple and convenient, and it is easy to find the reference plane. In addition, the rotating arc detector box has a fixed rotating mechanism and two sets of reference positioning devices on both sides of the rotating arc detector box, forming an independent rotating arc detector box module.

The rotating arc-shaped detector box used for X-ray inspection equipment provided by the present invention reciprocates around the rotation axis 10 within the range of the opening angle of the radiation source 3 of the X-ray machine as α along with the expansion and contraction of the push rod of the electric push rod device 2 , so that the detector is aligned with different radioactive sources in different channels. The working process of the rotating arc detector box will be described in detail below by taking the application of the rotating arc detector box in dual-channel X-ray inspection equipment as an example. The rotating power of the rotating arc detector box is driven by the electric push rod device 2. When the rotating arc detector 1 rotates to the left and right channels, two sets of reference positioning devices are used to locate the rotating position of the rotating arc detector 1. The reference positioning device is preferably a detector reference block with a proximity sensor. As shown in FIG. 4 , when the left channel is used, the connecting rod 20 is opened and stretched out, and the arc-shaped detector manifold 1 rotates clockwise around the rotary shaft 10 . When the arc-shaped detector integrated block 1 is rotated to the left and in place, use the left reference block of the detector to locate the relative position of the rotating surface of the arc-shaped detector integrated block 1, and use the proximity sensor of the left reference block of the detector to determine the rotation in place , to realize the accurate positioning of the rotating arc detector box in the left channel. Similarly, when the right channel is used, as shown in FIG. 5 , the connecting rod 20 shrinks, and the arc-shaped detector manifold 1 rotates counterclockwise around the rotary axis 10 . When the arc-shaped detector integrated block 1 is rotated to the right, use the right reference block of the detector to locate the relative position of the rotating surface of the arc-shaped detector integrated block 1, and use the proximity sensor of the right reference block of the detector to determine the rotation in place , to realize the accurate positioning of the rotating arc detector box in the right channel. When switching around the rotary axis 10 between the two channels of the rotating arc-shaped detector box, the positions of the corresponding target points of each detector crystal 5 are consistent, that is, the difference between the transmitting and receiving distances is not large, and the consistency of the changes in the indicators of the two channels is realized, which is convenient Image Processing. When the luggage is detected by the rotating arc-shaped detector box provided by the invention, the scanning position and area of the luggage are large, and the detection of the luggage on the conveyor can be realized. The invention realizes the ray detection requirements of different X-ray machines in different channels through the rotating mechanism, and drives the push rod of the electric push rod device 2 according to the goods signal received by the conveyor belt signal of the security inspection machine to realize corresponding contraction and opening, selectively According to the accurate positioning of the sensor of the left/right reference block of the detector, it becomes a detector of different channels. The position of the rotating arc detector box in the dual-channel detector provided by the present invention is a geometrically symmetrical position, so the deformation processing of the images of the two channels can be processed by the same method, and the geometric correction is easier.

To sum up, the rotating arc-shaped detector box for X-ray inspection equipment provided by the present invention can solve the problems of differences in indicators of the two channels, inconsistency of image deformation processing, and the like. The invention adopts a structure in which adjacent detector crystals are installed side by side, which has better effects in reducing scattering and improving wire resolution. With the detector layout structure of the present invention, the suitcase can be placed flat on the conveyor, the scanning effect is better, the conveying tray is omitted, the image effect is better, and the workload of security personnel is eased.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. A rotating arc-shaped detector box for X-ray inspection equipment, characterized in that it comprises an arc-shaped detector manifold and a rotating mechanism that makes the arc-shaped detector manifold rotate; The opening of the arc-shaped detector integrated block faces the radiation source of the X-ray machine, and the arc-shaped detector integrated block is fixed on the rotary shaft on the side away from the opening, so that the arc-shaped detector The integrated block rotates around the rotary shaft, and the rotating mechanism is arranged on the side away from the opening of the arc-shaped detector integrated block and connected with the circular-arc-shaped detector integrated block; the rotating arc-shaped detector The box rotates reciprocally around the rotation axis to realize switching between different channels, so that the detector integrated block is aligned with different radiation sources in different security inspection channels. 2. The rotating arc-shaped detector box according to claim 1, wherein the arc-shaped detector integrated block is fixed on the rotating shaft through a rotating support with holes, and on the rotating support The hole fits on the rotary shaft, and the rotary support is fixed on the side of the arc-shaped detector manifold away from the opening. 3. The rotating arc detector box as claimed in claim 1, wherein the rotating mechanism is an electric push rod device, a hydraulic push rod device, an air pressure push rod device, a gear transmission mechanism, and a chain wheel transmission mechanism. any kind. 4. The rotating arc detector box according to claim 1, wherein the rotating mechanism is an electric push rod device, and the electric push rod device includes a connecting rod that automatically expands and contracts when energized, and the connecting rod includes Two ends, one of which is fixed on the X-ray inspection equipment, and the other end is connected to the traction shaft on the side of the arc-shaped detector integrated block away from the opening, and the traction shaft is connected to the There is a sufficiently large distance between the rotary axes. 5. The rotating arc detector box according to claim 4, wherein one end of the connecting rod of the electric push rod device is fixed on the X-ray inspection equipment through a rotating shaft. 6. The rotating arc-shaped detector box according to claim 1, wherein a plurality of detector crystals are arranged on the arc of the arc-shaped detector manifold. 7. The rotating arc detector box according to claim 6, wherein the line connecting the center of the detector crystal and the target point is perpendicular to the tangent between the detector crystal and the arc. 8. The rotating arc detector box according to claim 6, characterized in that, within a certain opening angle range of the multiple detector crystals, adjacent detector crystals are installed side by side and equidistant from the emission source target layout. 9. The rotating arc detector box according to claim 8, characterized in that the gap between two adjacent detector crystals is not greater than 0.5 mm, so that the radiation does not scatter. 10. The rotating arc detector box according to claim 1, wherein two sets of reference positioning devices are arranged on both sides of the rotating arc detector box, and the reference positioning devices are detectors with proximity sensors base block.