CN1188695C - Vehicle-mounted Co-60 container inspecting system - Google Patents

Abstract

A vehicle-mounted cobalt-60 container inspection system belongs to the field of nuclear technology application. The system includes radiation source device, detection gantry system, array detector, data acquisition and image processing system, console, power supply and distribution system, etc. The radiation source device, the detection gantry system and the array detector are set in the equipment room; the data acquisition and image processing system and the console are set in the main control room; the power supply and distribution system is set in the power distribution room. The system can quickly complete the mutual conversion between detection and transportation states. The system is compact in structure, safe and reliable, convenient in transportation, wide in detection range, and low in site requirements, and is especially suitable for surprise inspections of anti-smuggling, anti-drug and anti-terrorism that require quick transitions and unlimited sites.

Description

Vehicle-mounted cobalt-60 container inspection system

technical field

The invention relates to the application field of nuclear technology, in particular to a single-vehicle vehicle-mounted cobalt-60 container inspection system capable of inspecting standard sea containers and below large objects.

Background technique

The vehicle-mounted mobile container inspection system is developed to meet the requirements of the customs and national security departments for the mobility, flexibility and surprise inspection of anti-smuggling, anti-drugs, and anti-terrorism. It has the characteristics of high equipment integration, simple operation, and transfer The field transportation is fast and convenient, and it can quickly enter the detection state after arriving at the detection site. It can work on various roads above level two and under various climatic conditions, and can work at night.

The main manufacturers of vehicle-mounted mobile container inspection systems include American AS&E Corporation, German Heimann Corporation, American SAIC Corporation, Nuclear Energy Technology Design and Research Institute of Tsinghua University, and Tsinghua Tongfang Nuclear Technology Corporation. The MobileSearch of AS&E Company in the United States uses a 450KeV X-ray machine and a solid detector. The X-ray machine is installed in the car body, and the detector is installed on a foldable horizontal arm and a vertical arm. The horizontal arm and the vertical arm are fixed on the rotating base through a support column. Above, the folding of the horizontal arm and the vertical arm is realized by electric hinges, the detection drive mode is friction wheel drive, and the vehicle guidance is manual driving guidance; the Mobile VACIS of SAIC Company of the United States uses cesium-137 or cobalt-60 source and solid detector, radiation The source is installed at the bottom of the vertical arm, and the detector is installed on the horizontal arm and the car body. The folding of the horizontal arm and the vertical arm is realized by hydraulic cylinders; the Mobile SILHOUETTE-SCAN of German Heymann Company uses a 140KeV X-ray machine, and the detector Installed on an independent vertical column. The column is usually fixed on the top of the inspection vehicle. During the inspection, it is manually moved down and erected on the ground, and aligned with the X-ray sector. The inspected vehicle is driven vertically through the X-ray sector. , so as to scan and detect; Tongfang Nuctech of Tsinghua Tongfang Company uses a 2.5MeV electron linear accelerator and a gas ionization chamber. Vehicles travel along a fixed path.

Chinese patent application 99122363.2 discloses a double-vehicle mobile container detection device with an accelerator as a radiation source. In this device, the detection device, control and imaging system are divided into two vehicles, the scanning vehicle and the control vehicle. Among them, the scanning vehicle adopts a crane chassis with a maximum driving speed of about 40km/h. The detection gantry adopts two sets of four-bar linkages. The horizontal cantilever with the detector is connected to the vertical cantilever with two oil cylinders. On a rotating base, the accelerator is used as the counterweight of the gantry during detection to ensure the balance of the car body and as a ray source. The control vehicle is equipped with power supply, control, data and image processing systems, and realizes data transmission with the scanning workshop through wireless communication. The control car supplies power to the scanning car through the cable. The front end of the scanning car is equipped with a guide wheel mechanism. During the inspection, the front wheel of the scanning car is lifted off the ground, and the rear wheel drives the scanning car to reciprocate according to the preset track. In addition to the inherent defects caused by using the accelerator as the ray source, the device also has the following disadvantages: the crane chassis travels at a low speed, and has a great impact on vibration-sensitive equipment such as the accelerator and ionization chamber, resulting in reduced equipment reliability and reduced image quality ; In addition to the high intensity of ionizing radiation and the large radiation safety protection area, the accelerator also has a large amount of microwave pollution, which has adverse effects on public health; a large amount of detection data generated by the detector will bring poor reliability through the wireless transmission of the scanning car and the control workshop , The image display speed is slow and the bit error rate is high; the friction wheel drive causes the wheel to wear and slip; the guide wheel mechanism cannot dynamically adjust the offset of the detection vehicle, and the position of the vehicle needs to be manually adjusted after multiple detections, which reduces work efficiency.

Chinese patent application 98101501.8 discloses a vehicle-mounted γ-ray digital radiation imaging mobile inspection station and its array detection device. The inspection station installs all the equipment on a trailer, and the inspection door frame is in the middle of the trailer. During the inspection, the inspected container vehicle needs to be manually driven through the inspection door frame, or the special dragging mechanism laid under the door frame will be inspected. The object is dragged across the door frame. Although the inspection station installs all the equipment on one vehicle, due to the use of a trailer, it needs to be towed by a tractor when moving between sites. The vehicle body is long (the trailer is about 12m), and the turning radius is large, which is not suitable for narrow and crowded inspection sites. , the maneuverability and flexibility are not enough; the middle part of the trailer is disconnected, leaving a scanning channel for the object to be inspected, which needs to be equipped with a roller-type drag mechanism, and auxiliary equipment is added; or the container truck to be inspected is driven through the scanning channel at a low and uniform speed , higher requirements on the driver, but also make the driver subject to unnecessary exposure.

Contents of the invention

The purpose of the present invention is to overcome the defects and deficiencies of the prior art, and provide a vehicle-mounted container inspection system that is mobile, flexible, light, and low in dosage. In this system, all the equipment is installed on a vehicle, and the object to be inspected is stationary during inspection, and the inspection vehicle moves parallel to the object to be inspected to complete the scanning inspection work.

The vehicle-mounted cobalt-60 container inspection system of the present invention includes a vehicle chassis, a detection gantry system and an array detector, a radiation source device and a radiation protection system, a data collection and image processing system, an electrical and control system, a power supply and distribution system, and dose monitoring And safety interlock protection system and carriage body, etc. The above-mentioned equipments are all installed on the chassis of a second-class truck, and are respectively arranged in three areas of the carriage body, wherein the radiation source device, the detection gantry system and the array detector are arranged in the equipment room at the rear of the carriage, and the data The acquisition and image processing system and console are set in the main control room at the front of the car, and the power supply and distribution system is set in the power supply and distribution room in the middle of the car.

The vehicle chassis is composed of chassis, auxiliary beam, detection driving device, hydraulic pump station and so on. The chassis adopts the second-class chassis of ordinary 4×2 or 6×4 trucks; the auxiliary beam is the installation basis of the entire bodywork equipment, which is a closed box structure; the detection drive device includes a transfer case structure and a pulley structure, and detects the driving status of the vehicle and detects The state conversion is realized through the motorized push rod to operate the clutch; the hydraulic pump station provides power for the detection driven hydraulic motor and the operation cylinder of the gantry and radiation source device.

The detection gantry system consists of a rotating support and a geared motor, a vertical column, a horizontal arm, a vertical arm, a counterweight arm and a counterweight, and corresponding hydraulic cylinders. The vertical column is divided into outer column and inner column; the outer column is fixed on the rotating support, the inner column is connected with the outer column through the oil cylinder, and is vertically lifted and positioned in the outer column through the plane slider under the action of the oil cylinder, so that the detection gantry system Overall lifting, the lifting height is correspondingly adjusted according to the height of the radiation source; the rotating support (3) is driven to rotate by the motor (4) through a gear or a rack. The horizontal arm and the vertical arm are hinged by a pin, and the vertical arm is vertically expanded or horizontally retracted under the action of the oil cylinder; the counterweight is hung on the end of the counterweight arm, and the counterweight arm slides along the plane slider in the horizontal arm through the action of the oil cylinder. After the detection gantry system is folded, the deceleration motor drives the rotary support to drive the detection gantry system to rotate, and the rotation angle is measured by the rotary encoder; when the horizontal arm is parallel to the center line of the detection vehicle, the vertical column is lowered, so that the detection gantry system retracts to the detection position. inside the car compartment.

The array detector is composed of 20-28 16-way gas ionization array detectors installed on the horizontal arm and the vertical arm, and the center line of each detector points to the center of the radiation source. There is a closed metal cover outside the array detector, which can ventilate, control temperature and dehumidify inside the cover.

The radiation source device consists of a mobile cobalt-60 gamma flaw detector, a shaking source conveying device, a radiation source studio, a shielded shutter, a front collimator, and a radiation source device lifting mechanism. The activity of the cobalt-60 source is 30-300 Curies; the radiation source studio, the shielding shutter, and the front collimator are made of lead or tungsten alloy; the radiation source device moves up and down along the linear guide rail or the guide sleeve through the action of the oil cylinder or the motor. The radiation protection system consists of protective lead plates, lead or tungsten traps, etc.

The data acquisition and image processing system consists of data acquisition station, computer and image processing software.

The electrical and control system consists of the main control system, industrial computer, electrical system, sensors and actuators, measurement and monitoring system, fault detection and alarm system, etc.

The power supply and distribution system consists of on-board generators, cable reels, isolation transformers, etc.

Dose monitoring and safety chain protection system consists of γ-ray dose detection equipment, photoelectric sensors, position switches and actuators. The dose detection instrument is used to detect the dose at a certain position in the radiation source device, and judge whether the radiation source is in the storage tank or in the working room; the shutter opening/closing position is detected by a proximity switch or a travel switch. When the radiation source is in the working room and the shutter is opened, once the sensor detects that people or unknown objects enter the control area of the detection site, the shutter will automatically close through the cylinder or electromagnet. Photoelectric sensors and ultrasonic sensors are also installed on the gantry and the detection vehicle body. Once it is detected that the distance between the detection vehicle and the detected object or other objects and personnel reaches the collision danger distance, the detection vehicle will stop in an emergency through the braking of the drive system. .

The vehicle-mounted cobalt-60 container inspection system of the present invention can arrange all radiation sources, detection devices, data acquisition and image processing systems, electrical and control systems, etc. in one inspection vehicle. The movement completes the detection work, and it is flexible.

Description of drawings

Fig. 1 is a front view of the transport state of the vehicle-mounted cobalt-60 container inspection system of the present invention.

Fig. 2 is a BB-direction view of the detection state of the vehicle-mounted cobalt-60 container inspection system of the present invention.

Fig. 3 is an A-A view of the transportation state of the vehicle-mounted cobalt-60 container inspection system of the present invention.

Detailed ways

Embodiments are described below in conjunction with the accompanying drawings.

As shown in FIG. 1 , the appearance of the inspection vehicle is a van, the chassis 23 is a 6×4 truck chassis, and the entire bodywork is installed on the auxiliary beam 2 . The carriage body 5 is divided into three separated spaces I, II and III, among which I is the main control room, where consoles, data acquisition and image processing systems are installed, and it is the workplace for testing staff; II is the power supply and distribution room. Room, installed generator 24, air conditioner, electrical control cabinet, power distribution cabinet, etc.; III is the equipment room, installed detection door frame system, radiation source device 22, cable reel 31 (see Figure 2) and so on. The skylight at the top of the compartment is divided into front and rear parts, the front skylight 11 covers the main control room I and the power distribution room II, and the rear skylight 6 covers the equipment room III. The support frame 25 fixed on the auxiliary beam 2 fixes the vertical arm 18 (folded to be parallel to the horizontal arm 14), so as to avoid damage to the detection gantry system and the array detector due to vibration and impact during transportation. During the detection work, the radiation source device 22 installed on the side of the auxiliary beam 2 can move up and down along the vertically arranged guide rail 1 under the action of the oil cylinder 21. The distance between the center of the radiation source and the ground is 200-1300mm to adapt to the detection range of the object to be inspected. Require. During transfer transportation, the radiation source device 22 is lifted to a high position and positioned with a positioning cylinder 26 to prevent damage to the radiation source device during transportation.

Lead plates for radiation protection were laid on the wall of the main control room I facing the object under inspection and the partition wall (including the door) between I and power distribution room II, as well as on the carriage body on the side of the radiation source (in the figure not shown), to ensure that the exposure dose of the personnel in the driver’s cab or the main control room is lower than the national standard’s radiation safety dose limit for radioactive workers under the state of transportation and detection of the detection vehicle, and at the same time ensure that normal The exposure dose of the public is lower than the radiation safety dose limit of the national standard for public personnel.

As shown in FIG. 2 , after the inspection vehicle arrives at the inspection site, the cable reel 31 is connected to the commercial power, or the on-board generator 24 generates power to supply power to the inspection vehicle equipment. The deployment process of the detection door frame system is: open the rear sunroof 6 and the front skylight 11 in sequence; Fig. 3) automatic flattening, so that the main control room becomes a closed space; the motor 4 drives the rotating support 3 of the vertical column 9 through a gear or a rack, so that the vertical column 9 is rotated 90 degrees counterclockwise and positioned; the front skylight 11 is closed; The counterweight arm 7 with counterweight 20 is stretched out by the effect of oil cylinder 8; A lead trap 19 with a length of about 1200mm is installed in the lower part of the vertical arm 18 to absorb the radiation passing through or surrounding the detector 30 during scanning detection, so as to meet the radiation protection requirements behind the vertical arm 18. The radiation source device 22 includes a mobile cobalt-60 gamma flaw detector (not shown), a shaking source conveying device (not shown), a radiation source working chamber 13, a shielded shutter 28, a front collimator 29, and a radiation source device lifting mechanism. Manually operate the source shaking handle to transport the radiation source to the lead or tungsten working room 13 through the conveying cable; switch the driving mode of the inspection vehicle to the inspection driving state; start the control system and data acquisition and image processing system, and the inspection is completed The preparation of the car can be tested.

The sections of the vertical column 9, the counterweight arm 7, the horizontal arm 14 and the vertical arm 18 are all closed box shapes, and the oil cylinders 10, 8 and 15 are placed inside them respectively. The array detectors 30 (24 in total) are close to the horizontal arm 14 and the vertical arm 18 side (see Fig. 3), and the fan-shaped surface formed by its ray entrance window and the radiation source (located in the center of the radiation source working room 13) contains the whole Check object section. The detectors 30 on the horizontal arm 14 and the vertical arm 18 are respectively covered with a box-shaped cover plate 36 (seeing Fig. 3 ) of an inner coating insulation layer to form a closed space, which can be air-conditioned and dehumidified.

As shown in Figure 3, there is a skylight at the top of the carriage body, and the top of the main control room 1 has the rainproof roller shutter 34 that automatically rolls up or unfolds along with falling into or rising out of the carriage body of the detection door frame system. When the detection is completed and the detection gantry system is retracted, as the vertical column 9 descends, the folded horizontal arm 14 and vertical arm 18 will press the rainproof roller blind 34 downward, and the reel 32 will follow and release. At this time, the rainproof roller blind 34 and the sealing slide bar (not shown) between the front and rear walls of the main control room 1 guarantees the sealing of the main control room 1 to rainwater, wind and sand, etc.; closure. Because the console 35 in the main control room 1 is arranged by the side wall of the compartment 5, it will not collide with the detection gantry system of recovery. When ready to detect, open the rear sunroof 6 and the front sunroof 11 in sequence, and with the lifting of the detection door frame system, the reel 32 retracts the roller blind 34 under the action of the coil spring or the motor until it is flattened, and then closes the front sunroof 11, Master control room 1 just forms the closed space that top is flat, and now the staff can enter master control room 1 by the door of compartment 5 sidewalls and carry out detection operation. Lighting, air conditioning and ventilation are arranged in the main control room 1.

Claims (6)

1. A vehicle-mounted cobalt-60 container inspection system, including a radiation source device, a detection gantry system, an array detector, a data acquisition and image processing system, a console, a power supply and distribution system, and a carriage body; wherein the radiation source device includes Mobile cobalt-60 gamma flaw detector, radiation source studio (13), shielded shutter (28), front collimator (29) and radiation source device lifting mechanism, characterized in that the above equipment is installed on a second-class truck on the chassis, and respectively arranged in three separate spaces in the compartment body (5), wherein the radiation source device, the detection gantry system and the array detector are arranged in the equipment room (III) at the rear of the compartment; The data acquisition and image processing system and console are set in the main control room (I) at the front of the carriage; the power supply and distribution system is set in the power supply and distribution room (II) in the middle of the carriage; the detection gantry system includes a vertical Column (9), horizontal arm (14), vertical arm (18), counterweight arm (7) and counterweight (20), wherein said vertical column, horizontal arm, vertical arm, and counterweight arm are all closed sections Box-shaped, and an oil cylinder (10) is installed inside the vertical column, and oil cylinders (8) and (15) are installed inside the horizontal arm and the counterweight arm; the array detector (30) is installed on the side of the horizontal arm and the vertical arm, and each The centerlines of each detector point to the center of the radiation source, and the fan-shaped surface formed by the radiation incident window of the detector and the radiation source contains the entire section of the object to be inspected. 2. The vehicle-mounted cobalt-60 container inspection system according to claim 1, characterized in that: the radiation source device (22) can move up and down under the action of the oil cylinder (21), and is positioned by the oil cylinder (26) to radiate The distance from the source center to the ground is 200-1300mm. 3. The vehicle-mounted cobalt-60 container inspection system according to claim 1, characterized in that: the vertical column (9) includes an outer column and an inner column, wherein the outer column is fixed on the rotating support (3), and the inner column The column is connected with the outer column through the oil cylinder (10), and is vertically lifted and positioned in the outer column along the plane slider under the action of the oil cylinder (10), and the lifting height is correspondingly adjusted according to the height of the radiation source. 4. The vehicle-mounted cobalt-60 container inspection system according to claim 1 is characterized in that: there is a skylight at the top of the car body (5); A roller blind that automatically rolls up or unfolds when the system is lowered or raised out of the car body. 5. The vehicle-mounted cobalt-60 container inspection system according to claim 1, characterized in that: the counterweight (20) is hung on the end of the counterweight arm (7), and the counterweight arm (7) passes through the oil cylinder ( 8) Act on the horizontal arm (14) to slide along the plane slider. 6. The vehicle-mounted cobalt-60 container inspection system according to claim 1, characterized in that: the horizontal arm (14) and the vertical arm (18) are hinged by a pin, and the vertical arm (18) Realize vertical expansion or horizontal retraction under the effect of oil cylinder (15), and lead or tungsten catcher (19) is installed on the lower section of vertical arm (18).

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