RU2091774C1 - Gear for customs check - Google Patents

Abstract

FIELD: customs check of large-sized objects. SUBSTANCE: gear incorporates protective chamber where source and detector of radiation are installed, roller conveyer on which rollers platform is positioned. Platform has drive for reciprocating movement on roller conveyer. Objects to be examined are put on platform in process of check. Platform is moved into zone where radiation source and detector are located. As platform reacts to vibrations of roller conveyer with entire its structure object will not vibrate with reference to source and detector which allows quality of image to be raised. EFFECT: improved quality of image of examined object. 4 cl, 3 dwg

Description

 The invention relates to devices for customs control of cars and freight containers and can be used in air and sea ports, automobile and railway customs control points.

Known flaw detector with x-ray inspection for inspection of welds of cylindrical products, containing a protective chamber in which the radiation source and receiver are located, a mechanized table with a roller table for moving and rotating the translucent products in the control zone and means for observing x-ray images placed outside the camera [1]
Due to the design of the mechanized table, the flaw detector allows to provide high performance and quality control only of cylindrical parts. In this case, the x-ray source is located inside the controlled product, and the receiver is outside the product. During inspection, the product should rotate around the longitudinal axis. The main disadvantage of the flaw detector is the inability to control a large-sized object without opening it.

The closest technical solution to the proposed one is a device for radiation monitoring of products, containing a protective chamber, source and receiver of x-ray radiation, image visualization means, a mechanism for moving the product into the control zone and vice versa, made in the form of a special trolley that moves along guide rails using a cable drive [2]
The device allows you to examine large-sized products, the mass and dimensions of which are determined by the design of the trolley. A protective chamber protects service personnel from scattered X-ray radiation.

 The main disadvantage of the known device is the need to place the x-ray receiver inside the controlled product, and the source outside it to prevent screening of the controlled area of the product with guide rails and a trolley on which the load moves.

 The design of this device does not allow detailed control of vehicles to “clearance”, since any even slight local “shadowing” of the radiation receiver (source) by the guide rails and the trolley leads to a significant complication of the analysis of the controlled image.

 The aim of the invention is to remedy these disadvantages.

 The specified purpose in the device for customs control, containing a camera in which a radiation source and receiver, a roller table for transporting controlled objects, visualization and image analysis tools, is achieved by the fact that a platform made of X-ray transparent material equipped with a reciprocating drive is installed on the rollers of the roller table moving along the roller table, while the roller table is divided in length into two parts, between which the source and receiver of x-ray radiation are located, and the ends of the roll langa brought out of the chamber not less than the length of the platform.

 The withdrawal of the ends of the roller table outside the protective chamber can significantly reduce the size of the protective chamber and simplify the control process by loading the platform outside the camera.

 On both sides of the roller table at a distance not exceeding half the length of the platform, roller stops are installed to prevent lateral shift of the platform.

 The platform is made of sheets of a homogeneous X-ray-transparent material laid in rows so that the joints between the sheets do not coincide in different rows and are interconnected. This allows you to assemble a homogeneous platform of any size (determined by the size and weight of the objects being monitored), as well as provide the same attenuation of the x-ray radiation incident on the receiver, therefore, does not introduce distortions into the resulting x-ray image.

 Figure 1 presents the kinematic diagram of the proposed device; in FIG. 2 fragment of a roller table with a platform; figure 3 construction of a multilayer platform.

 The customs control device comprises a platform 1 made of X-ray transparent material mounted on the rollers of the roller table 2 and connected by cables 3 to the drive 4. The main part of the roller table is installed in the protective chamber 5, in which the doors 6 and 7 are provided. Inside the protective chamber 5, an x-ray emitter 8 and receiver 9. The output of the receiver is connected by a cable to the visualization system 10. For stability of the platform 1, when moving along the rollers of the roller table 2, roller limiters 11 are provided, installed along the length of the role anga at a distance of not more than half the length of the platform. The platform is made of X-ray transparent sheet material 12, and rubber tracks 13 are glued on its upper side to increase the adhesion of the platform to the controlled object (car). The platform is connected to the cables 3 via blocks 14. The device operates as follows. Platform 1 is installed in the extreme right (according to the scheme) position outside the camera. A car drives into it. The door 6 opens and the platform 1 with the machine enters the protective chamber 5. The door 6 closes, a high voltage is supplied to the emitter 8, the drives 4 and the platform 1 turn on, due to the tension of the cables 3, it starts moving at a constant speed along the rollers of the roller table 2. At its In motion, the platform 1 crosses the x-ray beam from the emitter 8 to the receiver 9, which forms a set of flat transverse shadow images of the object (lines). Due to the movement of the platform, a shadow image of the object is formed. Means of visualization 10 provide an image of an object on a monitor screen. After the platform has approached door 7, the door opens, the emitter is turned off and the platform leaves the protective chamber 5. The car moves off the platform 1. The control cycle ends. Similarly, the control of containers or other bulky goods that are installed on the platform.

Claims (4)

 1. A device for customs control, containing a protective chamber in which a radiation source and receiver are installed, a roller table for transporting controlled objects, means of visualization and image analysis of the object, characterized in that, in order to improve the quality of the recorded images of large-sized massive objects, the device is equipped with a platform from X-ray transparent material mounted on the rollers of the roller table and equipped with a drive for reciprocating movement along the roller table, the roller table along the length p Cereal products in two parts, which are located between said source and receiver, and the ends of the roller conveyor withdrawn outside the chamber is not less than the length of the platform.  2. The device according to claim 1, characterized in that the platform is made of sheets of homogeneous material arranged in rows so that the joints between the sheets do not coincide in different rows and are interconnected.  3. The device according to claim 1, characterized in that the length of the platform exceeds the distance between both parts of the roller table.  4. The device according to PP.1 and 3, characterized in that on the sides of the roller table at a distance of no more than half the length of the platform from each other, roller limiters are installed.

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