A highly sensitive and rapid detection device for radionuclides

Abstract

This invention proposes a highly sensitive and rapid detection device for radionuclides, comprising two portal frames, on which opposing detection source boxes are mounted. A fixed base and a movable base are respectively mounted at the bottom of each portal frame. A guide rail is mounted below the movable base, which is movably connected to and slides along the guide rail. A frame is mounted in the middle of the rear side of the movable base, and a dual-output shaft motor is mounted in the middle of the frame. Each of the left and right output shafts of the dual-output shaft motor is equipped with a moving wheel, which is located at the top of the guide rail and provides rolling support. In this invention, the fixed base and the movable base support the two portal frames respectively. The movable base can move along the guide rail, thereby adjusting the distance between itself and the fixed base, i.e., the distance between the two detection source boxes. This allows for controllable adjustment based on the width of passing vehicles, ensuring that the detection source boxes are as close as possible to the passing vehicles while reducing the possibility of vehicles scratching the detection source boxes.

Description

Technical Field

[0001] This invention relates to the field of radionuclide detection, and more particularly to a highly sensitive and rapid radionuclide detection device. Background Technology

[0002] There are various types of radionuclides. Currently, the detection of radionuclides is based on selecting the appropriate detection equipment according to the type of nuclide. If there are many and varied types of radionuclides, a mass spectrometer will be used for detection. Currently, channel-type vehicle radioactivity monitoring systems are installed at customs checkpoints and entrances / exits of nuclear facilities to detect radionuclides in the entire vehicle.

[0003] Currently used detection source boxes are installed on gantry frames or gantries, which are fixed to the ground. Their installation positions are fixed, and the distance between the two opposing detection source boxes remains constant. No examples of adjustable distance have been observed. The applicable vehicle width for the passage is within a certain range. Within this range, the narrower the vehicle, the greater the distance between the vehicle and the detection source box, and the greater the impact of external conditions. If the vehicle approaches the maximum value of the range, there is a risk that the relatively protruding rearview mirrors on both sides of the vehicle may scratch the detection source box when passing through, because the movement of the vehicle depends on the driver's driving skills. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the defects of the existing technology. To solve the above technical problem, the technical solution adopted by this invention is: A highly sensitive and rapid detection device for radionuclides includes two portal frames, on which opposing detection source boxes are mounted. A fixed seat and a movable seat are respectively mounted at the bottom of the two portal frames. A guide rail is mounted below the movable seat, and the movable seat is movably connected to and slides along the guide rail. A frame is mounted in the middle of the rear side of the movable seat, and a dual-output shaft motor is mounted in the middle of the frame. Moving wheels are mounted on the left and right output shafts of the dual-output shaft motor, and the moving wheels are rolled and supported at the top of the guide rail. Positioning blocks are mounted at the bottom of the movable seats on both sides of the guide rail. Limiting blocks are fixed to the inner side of the guide rail on the positioning blocks. Limiting grooves are pre-set on both sides of the guide rail, and the limiting blocks are located within the limiting grooves for limiting sliding support.

[0005] The upper and lower surfaces of the limiting block and the limiting slide are both inclined.

[0006] The positioning block is equipped with wheel frames on both the front and rear sides, and rubber rollers are sleeved on the wheel frames. Dense bristles are fixed on the outer side of the rubber rollers.

[0007] Among them, the movable seats on the left and right sides of the guide rail are equipped with wheel frames at the front and rear, and driven wheels are sleeved on the wheel frames. The driven wheels are located on the top surface of the guide rail and are supported by rolling. The driven wheels are connected to the rubber roller for transmission.

[0008] The movable seat is equipped with a shaft frame on both the front and rear left and right sides. An upper gear and a lower gear are sleeved on the shaft frame. The upper gear and the lower gear mesh with each other. A drive shaft is inserted between the upper gear and the driven wheel. A pulley is installed at one end of the rubber roller and the lower gear. A drive belt is installed on the pulley of the rubber roller and the lower gear.

[0009] A laser rangefinder is installed on the top of the gantry frame above the fixed base.

[0010] The upper and lower inclined surfaces of the limiting block are each pre-set with a plurality of uniform spherical cavities, and ball bearings are sleeved inside the spherical cavities. The ball bearings are supported by rolling on the upper and lower inclined surfaces of the limiting groove.

[0011] The limiting block has a connecting hole between its upper and lower spherical cavities, and a through hole connecting the lower spherical cavity is provided on the lower inclined surface of the limiting block.

[0012] The limiting block is equipped with rubber scrapers at both its front and rear ends.

[0013] Both the fixed base and the movable base have upward-protruding anti-collision platforms fixed at their top left and right ends.

[0014] Compared with the prior art, the beneficial effects of the present invention include: 1. In this invention, a fixed seat and a movable seat are used to support two gantry frames respectively. The movable seat can move along the guide rail to adjust the distance between it and the fixed seat, that is, the distance between the two detection source boxes. This allows the distance to be controllably adjusted according to the width of the passing vehicle, which can ensure that the detection source box is as close as possible to the passing vehicle and reduce the possibility of the vehicle scratching the detection source box.

[0015] 2. In this invention, the movable wheel makes rolling contact with the guide rail, and then uses friction to drive the entire movable seat to move along the guide rail. It does not use lead screw and gear transmission, which can effectively prevent various foreign objects in the outdoor environment from entering the transmission structure and causing the transmission to jam. The drive of the movable wheel is less affected by the environment.

[0016] 3. In this invention, rubber rollers are provided at both ends of the positioning block. The rubber rollers are driven by the friction between the driven wheel and the guide rail, so that the bristles on the rubber rollers can clean the foreign objects at both ends of the limiting block, thereby reducing the impact of foreign objects on the movement of the limiting block.

[0017] 4. The present invention uses a two-layer transmission method of gears and transmission belts to drive the driven wheel and the rubber roller. The driven wheel and the rubber roller rotate in opposite directions, which can ensure that when the movable seat moves, the bristles at the front end of the moving direction always sweep foreign objects outward and forward, avoiding sweeping them into the limiting groove.

[0018] 5. In this invention, a ball bearing is provided on the limiting block, so that it rolls and supports the guide rail within the limiting groove. The rolling friction resistance is less than the sliding friction resistance, which can improve the smoothness of the movement of the movable seat on the guide rail. At the same time, the limiting groove is scraped by a rubber scraper, which can reduce the impact of dust on the rotation of the ball bearing.

[0019] 6. In this invention, a connecting hole and a through hole are provided to connect the spherical cavity. After the dust carried by the ball in the limiting groove enters the spherical cavity, it can fall out through the connecting hole and the through hole, thereby avoiding the continuous accumulation of dust in the spherical cavity, which would eventually affect the smooth rotation of the ball. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram illustrating the arrangement of the movable seat in this invention; Figure 3 This is a perspective view of the movable seat in this invention; Figure 4 This is an enlarged view of point A in this invention; Figure 5 This is a perspective view of the positioning block in this invention; Figure 6 This is a schematic diagram of the ball bearing arrangement in this invention.

[0021] Reference numerals in the attached diagram: 1. Portal frame; 2. Detection source box; 3. Fixed base; 4. Movable base; 5. Guide rail; 6. Dual-shaft motor; 7. Moving wheel; 8. Frame; 9. Positioning block; 10. Limiting block; 11. Limiting groove; 12. Driven wheel; 13. Wheel frame one; 14. Shaft frame; 15. Upper gear; 16. Lower gear; 17. Drive shaft; 18. Wheel frame two; 19. Rubber roller; 20. Brush bristles; 21. Pulley; 22. Drive belt; 23. Rubber scraper; 24. Ball bearing; 25. Spherical cavity; 26. Connecting hole; 27. Through hole; 28. Anti-collision platform; 29. ​​Laser rangefinder. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0023] According to one embodiment of the present invention, Figures 1-6 As shown.

[0024] A highly sensitive and rapid detection device for radionuclides includes two portal frames 1, each with a detection source box 2 bolted to it, and the two detection source boxes 2 facing each other. A fixed base 3 and a movable base 4 are respectively installed below the two portal frames 1. The top left and right ends of both the fixed base 3 and the movable base 4 are integrally formed with upwardly protruding anti-collision platforms 28. The bottoms of the two portal frames 1 are fixedly connected to the fixed base 3 and the movable base 4 respectively by bolts. A frame 8 is bolted to the rear center of the movable base 4, and a dual-output shaft motor 6 is bolted to the center of the frame 8. Casters 7 are bolted to the left and right output shafts of the dual-output shaft motor 6.

[0025] A guide rail 5 is installed below the movable seat 4, and the movable wheel 7 is supported on the top of the guide rail 5 and can roll on it. Positioning blocks 9 are bolted to the bottom of the movable seat 4 on both sides of the guide rail 5. Limiting blocks 10 are integrally fixed to the inner side of the positioning blocks 9 facing the guide rail 5. Limiting grooves 11 are pre-set on both sides of the guide rail 5 to cooperate with the limiting blocks 10. The limiting blocks 10 are located within the limiting grooves 11 to form limiting sliding supports. The upper and lower surfaces of the limiting blocks 10 and the limiting grooves 11 are both inclined. A laser rangefinder 29 is bolted to the top of the portal frame 1 above the fixed seat 3.

[0026] The fixed base 3 is fixed to the ground, and the movable base 4 is installed on the guide rail 5. The guide rail 5 needs to be embedded in the ground after a groove is cut, with its top surface flush with the ground. At the same time, the movable base 4 and the fixed base 3 are at the same height. In use, the fixed base 3 remains stationary and serves as a reference point. The vehicle passes according to the markings on the side of the fixed base 3. The distance between the movable base 4 and the fixed base 3 (i.e., the distance between the two detection source boxes 2) is adjusted according to the width of the vehicle to be detected, so that it can approach the passing vehicle but not get too close, facilitating vehicle passage and avoiding collisions between the vehicle and the detection source box 2 or the gantry 1.

[0027] During adjustment, the dual-output shaft motor 6 is controlled to operate, and its two output ends synchronously drive the moving wheel 7 to rotate. Since the moving wheel 7 is supported on the guide rail 5, and the guide rail 5 is relatively fixed to the ground, the movable seat 4 relies on the limiting block 10 and the limiting groove 11 to form a guiding support. Therefore, when the moving wheel 7 rotates, it uses the friction between itself and the surface of the guide rail 5 to push the entire movable seat 4 along the guide rail 5, thereby moving closer to or away from the fixed seat 3. After adjusting the movable seat 4 to a suitable distance according to the width of the passing vehicle, the vehicle to be tested passes between the two detection source boxes 2 at low speed, and the detection source boxes 2 can then perform radionuclide detection on the vehicle. The detection source box 2 uses a NaI(TI) or LaBr3 detector array, which has the advantages of short response time (seconds to minutes), simultaneous measurement of multiple nuclides, and high sensitivity. The amplifiers, multichannel pulse amplitude analyzers, cooling systems, lead shielding rooms, spectral interpretation software, and digital spectrometers required for gamma-ray spectrum detection are conventionally installed in the detection control room. These are conventional components, and this embodiment does not make any changes to their functions, effects, or uses. They are existing uses of the prior art, so these existing components will not be described in detail.

[0028] The detection source box 2 performs radionuclide detection on passing vehicles and displays the results on the terminal in the detection control room. The movable seat 4 moves one side of the gantry frame 1 and the detection source box 2. Based on the distance measurement data provided by the laser rangefinder 29, the distance between the two detection source boxes 2 can be flexibly adjusted according to the current vehicle width, improving usability and allowing the detection source box 2 to be closer to the vehicle, thereby improving detection accuracy. The movement of the movable seat 4 on the guide rail 5 is achieved by the rolling of the moving wheels 7 on the surface of the guide rail 5. When a vehicle passes, the guide rail 5 between the two gantry frames 1 is run over by the wheels, and dust and fine sand carried by the wheels and from the outdoor environment remain on the surface of the guide rail 5. Due to the rubber material properties of the moving wheels 7 and the rotational friction, there will be no situation where the wheels spin freely and fail to move the movable seat 4, ensuring stable drive.

[0029] In this embodiment, see Figures 1-6 On both sides of the guide rail 5, the movable seats 4 are bolted with wheel frames 13 at the front and rear. Driven wheels 12 are fitted onto wheel frames 13, supporting the top surface of the guide rail 5 and allowing them to roll. On both sides of the movable seats 4, the shaft frames 14 are bolted with upper gears 15 and lower gears 16 that mesh with each other. The upper gears 15 and driven wheels 12 are connected by a drive shaft 17. On both sides of the positioning block 9, the wheel frames 28 are bolted with rollers 19, which are fitted with dense bristles 20. Pulleys 21 are bolted to one end of both rollers 19 and lower gears 16, and drive belts 22 are mounted on their pulleys 21.

[0030] Since the detection source box 2 is located in an outdoor testing area with frequent vehicle traffic, and the guide rail 5 is installed in a ground groove, debris and fine sand from the outdoor environment can easily enter the groove, affecting the movement of the positioning block 9 following the movable seat 4. The rubber roller 19 solves this problem: when the movable seat 4 moves, the driven wheel 12 moves along with it and rotates under the rolling friction with the top surface of the guide rail 5. The rotation of the driven wheel 12 drives the upper gear 15 to rotate via the transmission shaft 17, which in turn drives the lower gear 16 to rotate via meshing transmission, and then drives the rubber roller 19 to rotate via the transmission belt 22, so that the bristles 20 sweep away debris on the moving path and avoid obstructing the movement of the movable seat 4. Meanwhile, after the force is transmitted through the upper gear 15 and the lower gear 16, the rotation direction of the rubber roller 19 is opposite to that of the driven wheel 12: when the movable seat 4 moves closer to the fixed seat 3 (the driven wheel 12 rotates clockwise), the rubber roller 19 on the front side of the positioning block 9 at the front end of the moving direction rotates counterclockwise; when the movable seat 4 moves away from the fixed seat 3 (the driven wheel 12 rotates counterclockwise), the front rubber roller 19 rotates clockwise. This reverse rotation characteristic ensures that the bristles 20 at the front end of the moving direction always sweep foreign objects forward, rather than towards the positioning block 9, thus ensuring the cleaning effect.

[0031] Multiple evenly distributed spherical cavities 25 are pre-set on the upper and lower inclined surfaces of the limiting block 10. Ball bearings 24 are fitted inside each spherical cavity 25, and the ball bearings 24 and the upper and lower inclined surfaces of the limiting groove 11 form rolling support. A connecting hole 26 is provided between the upper and lower spherical cavities 25 of the limiting block 10, and a through hole 27 is provided on the lower inclined surface of the limiting block 10 to connect to the lower spherical cavity 25. Rubber scrapers 23 are bolted to both ends of the limiting block 10. When the movable seat 4 moves on the guide rail 5, the limiting block 10 slides within the limiting groove 11. Larger foreign objects in outdoor environments are unlikely to remain on the upper and lower inclined surfaces of the limiting groove 11, but dust, being lightweight, may accumulate on the lower inclined surface, intervening between the sliding surfaces of the limiting block 10 and the limiting groove 11, affecting the smoothness of movement. The design of the ball bearing 24 reduces rolling friction resistance to sliding friction resistance, thus lowering movement resistance. Furthermore, the limited contact area between the ball bearing 24 and the limiting groove 11 results in a relatively large uncontacted space, minimizing the impact of dust on the rotation of the ball bearing 24. By creating the connecting hole 26 and through hole 27, dust carried on the surface of the ball bearing 24 can be discharged through these channels after entering the spherical cavity 25, preventing dust accumulation within the cavity and ensuring smooth rotation of the ball bearing 24. Simultaneously, the rubber scraper 23 can pre-clean dust or other foreign matter adhering to the upper and lower inclined surfaces of the limiting groove 11, further reducing the amount of dust entering between the limiting block 10 and the limiting groove 11.

[0032] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A radionuclide high-sensitivity rapid detection device comprising two gate-shaped frames (1), characterized in that, Two gantry frames (1) are equipped with opposing detection source boxes (2). Fixed seats (3) and movable seats (4) are respectively installed at the bottom of the two gantry frames (1). A guide rail (5) is installed below the movable seat (4). The movable seat (4) is movably connected to the guide rail (5) and slides along the guide rail (5). A frame (8) is installed in the middle of the rear side of the movable seat (4). A dual-output shaft motor (6) is installed in the middle of the frame (8). Moving wheels (7) are installed on the left and right output shafts of the dual-output shaft motor (6). The moving wheels (7) are located at the top of the guide rail (5) for rolling support. Positioning blocks (9) are installed at the bottom of the movable seats (4) on the left and right sides of the guide rail (5). A limit block (10) is fixed on the upper side of the positioning block (9) facing the inner side of the guide rail (5). Limit grooves (11) are preset on the left and right sides of the guide rail (5). The limit block (10) is located in the limit groove (11) for limiting sliding support.

2. The radionuclide high-sensitivity rapid detection device according to claim 1, characterized in that, The upper and lower surfaces of the limiting block (10) and the limiting slide (11) are both inclined.

3. The radionuclide high-sensitivity rapid detection device according to claim 1, characterized in that, The positioning block (9) is equipped with wheel frames (18) on both the front and rear sides. A rubber roller (19) is sleeved on the wheel frame (18), and dense bristles (20) are fixed on the outside of the rubber roller (19).

4. The radionuclide high-sensitivity rapid detection device according to claim 3, characterized in that, The movable seats (4) on the left and right sides of the guide rail (5) are equipped with wheel frames (13) at the front and back. A driven wheel (12) is sleeved on the wheel frame (13). The driven wheel (12) is located on the top surface of the guide rail (5) and is supported by rolling. The driven wheel (12) is connected to the rubber roller (19) for transmission.

5. The radionuclide high-sensitivity rapid detection device according to claim 4, characterized in that, The movable seat (4) is equipped with a shaft frame (14) on both the front and rear left and right sides. An upper gear (15) and a lower gear (16) are sleeved on the shaft frame (14). The upper gear (15) and the lower gear (16) mesh with each other. A drive shaft (17) is inserted between the upper gear (15) and the driven wheel (12). A pulley (21) is installed at one end of the rubber roller (19) and the lower gear (16). A drive belt (22) is installed on the pulley (21) of the rubber roller (19) and the lower gear (16).

6. The radionuclide high-sensitivity rapid detection device according to claim 1, characterized in that, A laser rangefinder (29) is installed on the top of the gantry frame (1) above the fixed base (3).

7. The radionuclide high-sensitivity rapid detection device according to claim 1, characterized in that, The upper and lower inclined surfaces of the limiting block (10) are each pre-set with a plurality of uniform spherical cavities (25), and ball bearings (24) are sleeved inside the spherical cavities (25). The ball bearings (24) are supported by the upper and lower inclined surfaces of the limiting groove (11).

8. The radionuclide high-sensitivity rapid detection device according to claim 7, characterized in that, A connecting hole (26) is provided between the upper and lower spherical cavities (25) of the limiting block (10), and a through hole (27) is provided on the lower inclined surface of the limiting block (10) to connect the lower spherical cavity (25).

9. The radionuclide high-sensitivity rapid detection device according to claim 2, characterized in that, Rubber scrapers (23) are installed at both the front and rear ends of the limiting block (10).

10. The radionuclide high-sensitivity rapid detection device according to any one of claims 1-9, characterized in that, Both the top left and right ends of the fixed seat (3) and the movable seat (4) are fixed with upward-protruding anti-collision platforms (28).

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