Radiation monitoring and early warning device for nuclear medicine production process

Abstract

This invention relates to a radiation monitoring and early warning device in the nuclear medicine production process, belonging to the field of radiation leakage detection technology for nuclear medicine production. The invention includes a radiation detection sensor and a matching traveling device. The sensor is fixedly mounted on the traveling device and can collect ambient radiation data in real time. The traveling device has a housing, a pair of parallel driven shafts, a drive shaft linking the two driven shafts, and a power motor. The power motor is built into the housing and drives the drive shaft synchronously to rotate the two driven shafts stably. Drive wheels are coaxially fixed at both ends of the driven shafts. A transmission belt is wound around the outer side of each of the two drive wheels. Multiple suction cups are evenly spaced along the outer side of the transmission belts, with the suction ports facing outwards. This invention relies on the suction cups to tightly adhere to the surface of the nuclear medicine production equipment, driving the device to move autonomously along the equipment surface, flexibly and dynamically achieving radiation inspection and effectively ensuring the safety of nuclear medicine production operations.

Description

Technical Field

[0001] This invention relates to the field of radiation leakage detection technology for nuclear medicine production, and specifically to a radiation monitoring and early warning device for the nuclear drug production process. Background Technology

[0002] The production of radiopharmaceuticals is a high-risk field of radioactive operations. The entire production process must be completed in sealed protective equipment or in a fully enclosed production workshop or area to prevent the leakage of radioactive rays and radioactive contaminants, and to ensure the safety of the production environment and the personal safety of the operators.

[0003] Currently, radiation monitoring and early warning in nuclear medicine production processes generally employs a simple combination of buzzer alarms and radiation detection sensors or corresponding detection devices. An alarm is triggered when the detected radiation level exceeds the standard. Traditional detection and early warning devices typically use multiple sensors deployed at various points to monitor and warn of leaks across an entire area. Multiple sensors are fixed around corresponding equipment or in designated areas on a single piece of equipment. This method has limited detection area and accuracy, and there are instances where leaks far from the leak site cannot be detected in a timely manner. Furthermore, the installation and use of multiple sensors is extremely inconvenient. When monitoring a suspected leak point, personnel must approach and adjust the sensor's installation position, posing a radiation hazard. As an example of process equipment, the synthesis / packaging hot chamber is a core, dedicated protective production equipment in nuclear medicine production, directly undertaking key processes such as nuclear medicine synthesis, packaging, and material transfer. The airtightness and integrity of its equipment structure are crucial for preventing radiation leaks.

[0004] Currently, the industry-standard synthesis / packaging hot chamber is a vertical, giant stainless steel cabinet structure with stable overall dimensions. The equipment weighs 3-8 tons, featuring a robust protective structure and strong overall stability. The outer shell of this type of hot chamber is made of stainless steel with a smooth, flat surface and high cleanliness. The sides, front, and top of the cabinet are all flat, hard stainless steel surfaces without complex protrusions or depressions, making it corrosion-resistant and less prone to dust accumulation. This meets the high cleanliness and high protection requirements of nuclear pharmaceutical production. A 50-100mm lead plate is embedded in the chamber's interlayer, relying on the strong shielding properties of lead to achieve basic radiation protection. The front of the equipment is equipped with a 120-150mm lead equivalent thick lead glass observation window, facilitating operator observation of the internal production conditions. It also features two circular glove holes for installing lead-protective latex gloves, enabling remote, contactless operation. The side features a labyrinthine lead-sealed material transfer door, ensuring smooth material transfer while minimizing the risk of radiation leakage. The top has a raised exhaust duct with an integrated HEPA filter to filter radioactive aerosols generated during production and purify exhaust gases; however, this is also a potential source of radiation leakage. Under long-term operation in a continuous radiation environment, high-frequency operation, and the effects of aging, this type of equipment is highly susceptible to multiple seal failures and component malfunctions, leading to serious radiation leakage hazards. First, the operating gloves, subjected to prolonged exposure to radiation, chemical corrosion, and repeated stretching, are prone to aging and damage, leading to leakage of chemicals and radiation. Second, the sealing rings at the junction of the lead glass and the cabinet are prone to aging and cracking, and the frequent opening and closing of the equipment doors can cause seal failure, creating gaps for radiation leakage. Third, the top exhaust filter is prone to damage and filtration failure after long-term use, causing radioactive aerosols to escape directly into the external environment with the exhaust gas. Fourth, various pipe joints in the internal cavity are prone to leakage under the pressure of the medium and the effects of radiation aging, allowing radioactive waste liquid to seep into the equipment interlayer, creating a hidden risk of radiation pollution and leakage.

[0005] To address the aforementioned radiation leakage risks, there is currently no dedicated automated inspection equipment in the industry. The mainstream monitoring method involves deploying radiation sensors at fixed points and supplementing this with regular manual inspections, adjusting the detection locations according to actual production conditions. The limited number of fixed-point sensors allows for monitoring only at fixed locations, which are not only far from the target but also fail to cover hidden blind spots such as equipment seams, glove connections, and door gaps, resulting in extremely poor monitoring flexibility and comprehensiveness. Furthermore, active monitoring during manual inspections requires operators to enter the radiation work area, posing a risk of radiation exposure. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a radiation monitoring and early warning device for the radiopharmaceutical production process, so as to solve the problems of existing technology, such as many blind spots in radiation monitoring during the radiopharmaceutical production process, poor mobility and flexibility making it impossible to detect nearby, and insufficient accuracy and timeliness of detection.

[0007] This invention is achieved through the following technical solution: A radiation monitoring and early warning device for the radiopharmaceutical production process includes a sensor for detecting radiation intensity. The radiation sensor is mounted on a traveling device, which includes a housing, a pair of driven shafts arranged parallel to each other, and a drive shaft located inside the housing that drives both driven shafts. The drive shaft is connected to a power motor installed inside the housing, so that the two driven shafts rotate around their own axes. Drive wheels are coaxially fixed at both ends of the driven shafts. A transmission belt is wound around the outer side of each pair of drive wheels that are directly opposite each other. Several suction cups are evenly spaced on the outer side of the transmission belt along its extension direction. The suction ports of the suction cups are away from the transmission belt, so that when the drive shaft rotates, it drives the two transmission belts forward through the two driven shafts. During the journey, multiple suction cups on each transmission belt simultaneously adhere to the surface of the radiopharmaceutical production equipment, so that the traveling device can monitor the radiation values ​​of the surrounding area while freely traveling on the surface of the radiopharmaceutical production equipment.

[0008] Furthermore, a main worm gear is coaxially fixed at the center of the drive shaft, and an end worm is coaxially fixed at each end; the power motor is vertically installed inside the housing, with the main shaft of the power motor installed downwards and the end fixed with a main worm, which meshes with the main worm gear; a driven worm gear is coaxially fixed in the middle section of the driven shaft, and the driven worm gear meshes with the end worm.

[0009] Furthermore, the transmission belt is a track structure, and the suction cup is fixed to the outside of the track chain plate, with each suction cup fixed to only one chain plate.

[0010] Furthermore, the chain plate is made of plastic, and the teeth on the inner surface of the chain plate for meshing with the drive wheel are made of metal.

[0011] Furthermore, the transmission belt is a synchronous toothed belt, and the suction cup is fixed on the outer surface of the synchronous toothed belt and is integrally fixed with the synchronous toothed belt.

[0012] Furthermore, four support columns are vertically fixed inside the housing, and a rectangular bearing plate is fixed at the top of each support column. The bearing plate has a threaded hole in the center, which is used to fix the rectangular flange plate at the end of the power motor by bolt connection. There is a through hole in the center of the flange plate, through which the main shaft of the power motor passes vertically downward and then fixes the main worm gear.

[0013] Furthermore, a first gear is coaxially fixed at the bottom end of the main worm gear, and the first gear meshes with a second gear rotatably installed inside the housing. A third gear is fixed at the upper end of the gear shaft of the second gear, and the bottom end of the gear shaft is rotatably installed in a thrust ball bearing fixed to the bottom of the housing. The gear shaft is rotatably installed in a deep groove ball bearing near the third gear. The deep groove ball bearing is fixed to the inner side wall of the housing by a cantilever rod. A circular stepped rotating platform is rotatably installed at the top center of the housing. The rotating platform has an internal gear structure coaxially integrated inside, and the internal gear structure forms an internal meshing transmission with the third gear. The sensor realizes dynamic rotation detection through the rotating platform.

[0014] Furthermore, several connecting rods are fixed in a circular array on the outer side of the rotating platform. The ends of the connecting rods are fixed to the inner wall of a cylindrical protective cylinder, and a circular and flexible cleaning ring is coaxially fixed to the bottom end of the protective cylinder. When the cleaning ring rotates, it wipes the area around the driving device clean.

[0015] Furthermore, the top of the rotary table protrudes from the center of the top of the housing and a rotary motor is vertically fixed thereon. The output shaft of the rotary motor is facing upward and is fixed with a mounting plate. An automatic telescopic rod is fixed to the side of the mounting plate. A recessed mounting seat is fixed to the telescopic end of the automatic telescopic rod. The end of the sensor opposite to the detection end is rotatably mounted in the groove of the mounting seat via a rotating shaft. One end of the rotating shaft is coaxially fixed to the motor shaft of a pitch motor fixed outside the mounting seat, so as to realize the pitch swing of the sensor. The pitch swing angle of the sensor allows the detection end of the sensor to enter the protective glove of the nuclear drug production equipment and enter the corresponding sealing gap.

[0016] Furthermore, the main body of the outer shell is a rectangular box structure. On the left and right sides of the outer shell, near the corresponding transmission belts, there are bearing mounting chambers integrally formed. The bearing mounting chambers are equipped with bearings for the driven shaft to rotate. In the center between the two bearing mounting chambers, there is also a protruding transmission chamber integrally formed with the outer shell. The transmission chamber is used to install the transmission structure for the drive shaft and the driven shaft to drive each other.

[0017] The beneficial effects of this invention are as follows: This radiation monitoring and early warning device for the radiopharmaceutical production process utilizes a crawlable and rotatable sensor-based mobility component. It autonomously crawls extensively and targets common leak sites for high-frequency detection, providing dynamic multi-angle monitoring. It also features a self-cleaning function. Through a mechanical walking structure adapted to the structure and surface characteristics of equipment such as hot chambers, it achieves flexible and precise dynamic monitoring. The specific working principle is explained below: 1. Within a specific area, autonomous full-area inspection can be achieved, minimizing monitoring blind spots and significantly improving monitoring accuracy. This invention relies on a tracked / synchronous toothed belt drive structure, coupled with evenly distributed external suction cups, to closely adhere to the smooth stainless steel cabinet surface and sides of the synthesis / dispensing hot chamber, stably crawling and moving. This overcomes the limitations of traditional monitoring methods that can only monitor fixed points, allowing the device to automatically move to suitable areas such as the front, sides, seams, material transfer doors, and around exhaust ducts. Simultaneously, the device is equipped with a rotatable and pitch-adjustable sensor structure. A rotary table drives the sensor to rotate horizontally in a circular motion. When necessary, the traveling device stops, and the rotary motor rotates the sensor to a specific position. Combined with the up-and-down swing motion driven by the pitch motor, the sensor can detect in a predetermined direction. Furthermore, its detection end can, to some extent, flexibly extend into the inside of protective gloves, equipment sealing gaps, surface depressions, and other narrow and hidden blind spots, accurately detecting minute radiation leaks at close range. This comprehensively covers risk points that traditional inspections cannot reach, greatly improving the accuracy and comprehensiveness of radiation leak detection. Furthermore, the device's travel speed is linked to the sensor's rotation and scanning speed, which can effectively avoid missed inspections caused by excessive travel speed and ensure the quality of inspections.

[0018] 2. Relying on a stable self-locking transmission structure, it is suitable for smooth surface inspection of equipment, ensuring high operational safety and stability. This invention adopts a vertical motor paired with a multi-stage worm gear transmission structure. The worm gear transmission characteristics achieve power reduction and torque enhancement, providing sufficient power for crawling on the equipment surface, adapting to the inspection and movement needs of tall cabinet equipment. Simultaneously, the worm gear mechanism has a self-locking characteristic, allowing the device to stop at any position on the equipment surface at any time, maintaining stable posture, facilitating precise point-to-point detection by sensors.

[0019] 3. Significantly replaces high-risk manual operations, completely eliminating the risk of radiation exposure for personnel. Radiopharmaceutical production areas are subject to high-intensity radioactive radiation. Manually adjusting sensor detection areas during inspections requires prolonged exposure to this high-risk environment, making personnel highly susceptible to radiation exposure. Furthermore, even minor leaks are difficult to detect manually, posing significant personal safety hazards. This invention enables remotely controlled, unmanned autonomous inspections, requiring no human intervention throughout the entire process. It allows for flexible, 24 / 7 monitoring and inspection of radiopharmaceutical production equipment, greatly reducing the frequency and safety risks of personnel entering radiation-affected areas, and significantly improving the safety and intelligence level of radiopharmaceutical production line operation and maintenance.

[0020] 4. It also features automatic cleaning, ensuring stable inspection conditions and reducing equipment maintenance costs. This invention includes a protective cylinder and a flexible cleaning ring on the outside of the rotating table. During inspection, the cleaning ring rotates synchronously with the sensors, automatically wiping away dust, debris, and other contaminants from the equipment surface. This prevents surface impurities from affecting the adhesion between the suction cup and the cabinet surface, preventing slippage and suction failure, and ensuring continuous and stable inspection operations. Furthermore, it enables automated cleaning of the equipment surface, reducing the frequency of manual cleaning, lowering the daily maintenance workload and costs, and meeting the high-cleanliness requirements of nuclear drug production.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] Figure 1 This is a top partial sectional view of the main structure of a radiation monitoring and early warning device for the production process of radiopharmaceuticals (within the casing, transversely cut from a shaft section above the power motor). Figure 2 To be Figure 1 A schematic diagram of the structure after the power motor has been removed; Figure 3 This is a side view of the transmission structure between the drive wheel and the drive belt equipped with suction cups. Figure 4 This is the first transverse sectional top view of a radiation monitoring and early warning device for the radiopharmaceutical production process (cut from a cross section that exposes the top of the housing of the rotary table and is located below the rotary motor). Figure 5 This is a second transverse sectional top view of a radiation monitoring and early warning device for the radiopharmaceutical production process (cut from a cross section below the mounting plate where the output shaft of the rotary motor is located). Figure 6 This is a top view of a radiation monitoring and early warning device for the radiopharmaceutical production process according to the present invention; Figure 7 for Figure 6 A sectional view of the structure at point AA showing the relative mounting positions of the protective cylinder, housing, rotary table, and rotary motor.

[0023] In the diagram: Driven shaft 1, Driven shaft 2, Main worm gear 3, Main worm 4, Main shaft 5, First gear 6, Power motor 7, Heat dissipation hole 701, Second gear 8, Gear shaft 9, Bearing plate 10, Flange plate 11, Driven worm gear 12, Drive wheel 13, Transmission belt 14, Suction cup 15, Bearing mounting chamber 16, Transmission chamber 17, Threaded hole 18, Housing 19, Third gear 20, Rotary table 21, Internal gear structure 2101, Rotary motor 22, Flange 2201, Output shaft 23, Mounting plate 24, Automatic telescopic rod 25, Mounting base 26, Rotating shaft 27, Sensor 28, Detection end 2801, Pitch motor 29, Connecting rod 30, Protective cylinder 31, Cleaning ring 32, Thrust ball bearing 33, Deep groove ball bearing 34, Cantilever rod 35. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] Please see Figures 1-2 This invention provides a technical solution: specifically, a radiation monitoring and early warning device for the production process of radiopharmaceuticals. This radiation monitoring and early warning device is equipped with a sensor 28 or a corresponding radiation detection device for real-time detection of ambient radiation intensity. The sensor 28 is integrated and mounted on a self-moving vehicle. Specifically, as... Figure 1 , Figure 2 , Figures 4-5In this embodiment, the driving device has a closed housing 19 as the overall load-bearing base. Inside the housing 19, a pair of driven shafts 1 arranged in a parallel, spaced-apart configuration are mounted. Simultaneously, a drive shaft 2 is mounted in the center of the housing 19, which can simultaneously form a transmission connection with both driven shafts 1. A power motor 7 is fixedly installed inside the housing 19. The main shaft 5 of the power motor 7 is connected to the drive shaft 2. When the power motor 7 is working, it drives the drive shaft 2 to rotate, thereby causing the two driven shafts 1 to rotate around their respective axes. At the same time, drive wheels 13 are coaxially fixedly mounted at both ends of each driven shaft 1. The two sets of drive wheels 13 facing each other on the left and right are arranged as follows... Figure 3 A drive belt 14 is arranged around the device to form two sets of symmetrical drive and travel structures. Multiple suction cups 15 are evenly spaced along the extension of each drive belt 14 on its outer side. All suction cups 15 have their suction ports facing outwards and away from the drive belt 14, allowing them to contact and adhere to the stainless steel surface of nuclear drug production equipment, such as the synthesis / packaging hot chamber where radiation leakage is most likely. This allows them to crawl on the equipment and detect surrounding leaks, especially at equipment joints, such as cracks in the sealing rings between lead glass and cabinets, door seals, and the connection points of operating gloves or the inside of the equipment itself. This prevents radiation leaks caused by poor sealing or aging damage. This radiation monitoring and early warning device can be remotely controlled by the motor 7 to operate to the corresponding part of the equipment for targeted detection of critical parts and routine inspections around the equipment. It can be used unattended or flexibly to inspect the production line, fundamentally avoiding the risk of manual entry into radiation areas and significantly reducing the number of sensors 28 required for maintenance. In actual operation, the power motor 7 drives the drive shaft 2 to rotate, which in turn drives the two driven shafts 1 to rotate synchronously via the transmission belt 14. This drives the two transmission belts 14 to move forward along the surface of the nuclear drug production equipment. During the movement of the transmission belts 14, some of the suction cups 15 on the belt can be tightly attached to the outer wall surface of the nuclear drug production equipment. Relying on the adsorption force of the suction cups 15, the traveling device is stably attached to the surface of the equipment. During the entire process of the device's autonomous inspection and travel, the radiation sensor 28 continuously collects the radiation values ​​of the surrounding area, completing the radiation inspection and monitoring work of the equipment surface and surrounding area. When the obtained radiation exceeds the set value, an alarm is issued through the alarm device such as the buzzer installed with it.

[0028] In this embodiment, as Figures 1-2At the axial center of the drive shaft 2, i.e., the middle position, the main worm gear 3 is coaxially fixedly mounted. Simultaneously, a section of end worm is coaxially fixedly mounted at each of the left and right ends of the drive shaft 2, with the two end worm sections symmetrically distributed on both sides of the main worm gear 3. The power motor 7 is vertically mounted, or vertically installed, and fixedly mounted inside the housing 19. The main shaft 5 of the power motor 7 is arranged vertically downwards, and a main worm 4 is fixedly mounted at the bottom end of the main shaft 5. The main worm 4 meshes with the main worm gear 3 on the drive shaft 2 to form a worm gear transmission pair. At the axial middle section of the two driven shafts 1, driven worm gears 12 are coaxially fixedly mounted, and each driven worm gear 12 meshes with the end worm at the corresponding end of the drive shaft 2. When this radiation monitoring and early warning device is in operation, the vertically mounted power motor 7 drives the main worm 4 to rotate. Through the meshing transmission between the main worm 4 and the main worm wheel 3, the rotation of the drive shaft 2 synchronously drives the end worms (not shown in the figure) at both ends to rotate. Then, through the meshing transmission between the end worms and the driven worm wheel 12, the two driven shafts 1 are driven to rotate synchronously, thereby realizing the step-by-step transmission of power and ensuring the stable movement of the traveling device. At the same time, the transmission characteristics of the worm wheel and worm gear realize the power deceleration and torque increase, which is suitable for the work requirements of stable inspection of equipment surfaces. Moreover, the worm wheel and worm gear mechanism itself can have a self-locking function, which can maintain stability when it stops on the nuclear drug production equipment, making it convenient for the sensor 28 to detect in a targeted manner.

[0029] In this embodiment, the transmission belt 14 in the above embodiment can be a tracked structure, which is formed by multiple sets of chain plates hinged together to form the main body of the annular transmission belt 14. The suction cups 15 are assembled independently on the outside of the track, following the assembly principle of one suction cup 15 per chain plate. Each chain plate has a suction cup 15 individually fixed to its outer side, and each suction cup 15 is evenly distributed on the outer surface of the track along with its corresponding chain plate. When the tracked transmission structure moves with the drive wheel 13, each chain plate is parallel to the surface of the nuclear drug production equipment in sequence. The suction cups 15 on the corresponding chain plates can intermittently adhere to the equipment surface, improving the stability of the traveling device on the equipment surface, preventing slippage or detachment during inspection, and ensuring continuous radiation monitoring.

[0030] As one of the specific implementation structures, the main structure of the aforementioned track chain plates is made of one-piece molded plastic material. Plastic chain plates are lightweight and corrosion-resistant, making them suitable for the special working conditions of nuclear pharmaceutical production. They also effectively reduce the overall weight of the driving device and decrease the travel load. On the inner surface of each plastic chain plate, a specially molded tooth structure (not shown in the figure) for meshing with the drive wheel 13 is installed. This meshing tooth is made of metal and individually machined before being fixedly assembled at the corresponding position on the chain plate. Through the composite structure design of the plastic chain plates and metal meshing teeth, the overall lightweight and corrosion-resistant advantages of the track are retained, while the high strength and wear resistance of the metal material are utilized to improve the structural strength and service life of the meshing transmission parts. This avoids problems such as tooth wear, slippage, and breakage during long-term transmission, ensuring the stable operation of the track transmission structure.

[0031] In this embodiment, the transmission belt 14 is configured as a commonly used synchronous toothed belt structure. The precise transmission and slip-free characteristics of the synchronous toothed belt ensure accurate travel transmission while also being lighter in weight. All suction cups 15 are fixedly mounted on the outer surface of the synchronous toothed belt, and the suction cups 15 and the synchronous toothed belt are integrally molded, effectively improving the connection strength between the suction cups 15 and the transmission belt 14 and preventing the suction cups 15 from falling off or loosening during long-term travel and adsorption. The integrated structural design ensures that each suction cup 15 moves synchronously with the synchronous toothed belt, maintaining a unified adsorption rhythm. This allows the synchronous toothed belt to maintain a stable adsorption and adhesion state when traveling on the equipment surface, further improving the smoothness of the travel device's inspection movement and ensuring the continuity and stability of radiation monitoring data acquisition.

[0032] In order to vertically and overhead install the power motor 7, in this embodiment, four vertical support columns (not shown in the figure) are vertically fixedly installed in the internal cavity of the housing 19. The four support columns are arranged in a rectangular array, such as... Figure 1 and Figure 2 Each of the support columns shown has a rectangular support plate 10 fixed to its top, allowing the support plate 10 to be horizontally suspended inside the housing 19. Each support plate 10 has a threaded hole 18 at its center. A rectangular flange plate 11 is fitted to the end of the power motor 7. The flange plate 11 has corresponding fixing holes at the threaded holes 18. The flange plate 11 is fixed to the support plate 10 by bolts, achieving overall fixed assembly of the power motor 7. Simultaneously, a through hole for the main shaft 5 is provided at the center of the flange plate 11. After the power motor 7 is vertically fixed, its main shaft 5 passes vertically downwards through the through hole in the flange plate 11, extending into the space below the support plate 10. A main worm gear 4 is fixedly mounted at the bottom of the main shaft 5, making the structure of the housing 19 more compact, lowering the center of gravity of the entire device, and facilitating crawling on the surface, especially the sides, of the nuclear drug production equipment.

[0033] In this embodiment, as Figure 1 , Figure 2 Below the main worm gear 4, a first gear 6 is coaxially fixedly mounted. The first gear 6 meshes with the second gear 8. The first gear 6 is rotatably mounted in a preset installation position near the lower part of the housing 19. Therefore, it is installed below the main worm gear 4 to avoid interference with the main worm wheel 3 on the drive shaft 2 as much as possible, while leaving more installation space for auxiliary components in the upper middle area of ​​the housing 19. Near the upper end of the vertically arranged gear shaft 9 of the second gear 8, a third gear 20 is coaxially fixedly mounted. Figure 7 As shown, during installation, the bottom end of the gear shaft 9 can be rotatably mounted inside a thrust ball bearing 33. This thrust ball bearing 33 is fixedly embedded in the bottom wall of the housing 19 and can withstand the vertical load of the gear shaft 9. The shaft position of the gear shaft 9 near the third gear 20 is rotatably mounted inside a deep groove ball bearing 34. The deep groove ball bearing 34 is suspended and fixed to the inner wall of the housing 19 by three cantilever rods 35, realizing the double bearing positioning support of the gear shaft 9 and ensuring its stable rotation. Figures 4-7 At the top center of the housing 19, a hollow, circular, stepped rotating platform 21 is rotatably mounted. An internal gear structure 2101 is integrally formed coaxially inside the rotating platform 21, which meshes with the aforementioned third gear 20. The sensor 28 is directly or indirectly mounted on the rotating platform 21. When the device is working, the main worm gear 4 rotates, driving the first gear 6, the second gear 8, and the third gear 20 in a step-by-step transmission. Through the meshing of the third gear 20 with the internal gear, the rotating platform 21 rotates horizontally, thereby causing the sensor 28 to perform a circular dynamic rotation, achieving multi-angle, large-area dynamic radiation detection without blind spots. Furthermore, it can instinctively increase its rotation speed as the travel speed increases, avoiding the inability to quickly scan and detect the surrounding area due to excessive travel speed.

[0034] In this embodiment, as Figures 6-7 Multiple connecting rods 30 are fixedly mounted in a circular array on the outer wall of the rotating platform 21. The outer ends of all connecting rods 30 are fixedly connected to the inner wall of the cylindrical protective cylinder 31, so that the protective cylinder 31 is coaxially sleeved on the outside of the rotating platform 21, forming a protective barrier for the device. At the bottom end of the protective cylinder 31, a flexible cleaning ring 32 with a ring structure is coaxially fixedly mounted. The cleaning ring 32 is made of flexible and wear-resistant material and is integrated with the protective cylinder 31. When the rotating platform 21 rotates in a circular motion under the action of gear transmission, the connecting rods 30 drive the protective cylinder 31 and the cleaning ring 32 at the bottom to rotate synchronously. The bottom end of the cleaning ring 32 is in contact with the surface of the nuclear drug production equipment and the surrounding area of ​​the device. During the rotation, it can automatically wipe and clean the dust, debris and other contaminants on the surface of the equipment, preventing contaminants from affecting the adhesion between the device and the suction cup 15 when moving, and also automatically cleaning the production equipment.

[0035] In this embodiment, as Figures 5-7 As shown, the top of the rotary table 21 protrudes from the top face of the housing 19. A rotary motor 22 is vertically fixed at the center of the top of the rotary table 21 via a flange 2201. The output shaft 23 of the rotary motor 22 faces upward, and a horizontally mounted mounting plate 24 is fixedly fitted at the top of the output shaft 23. A horizontally telescopic automatic telescopic rod 25, such as an electric actuator or a hydraulic rod, is fixedly fitted to the outer wall of the mounting plate 24. The telescopic end of the automatic telescopic rod 25 is fixedly connected to a centrally recessed mounting seat 26. A sensor 28 is rotatably mounted inside the groove of the mounting seat 26 via a transverse rotating shaft 27. The end of the sensor 28 facing away from the detection is rotatably mounted in the groove. In addition, a pitch motor 29 is fixedly installed on the outer wall of the mounting seat 26. The motor shaft of the pitch motor 29 is coaxially fixed to one end of the rotating shaft 27. The start and stop of the pitch motor 29 can drive the rotating shaft 27 to rotate, causing the sensor 28 to perform a pitching and oscillating motion. The pitch and swing angle of sensor 28 is adapted to allow its detection end 2801 to flexibly extend into the protective gloves of nuclear drug production equipment, narrow and concealed areas such as equipment sealing gaps or equipment surface recesses, and get as close as possible to the detection area to more easily detect radiation leakage. This enables targeted radiation detection of conventional monitoring blind spots and significantly improves the monitoring coverage and detection accuracy of the device.

[0036] Finally, as part of the complete design scheme, such as Figure 2 , Figures 4-5 as well as Figure 7 The main body of the housing 19 of this device is designed as a rectangular box structure, serving as the overall load-bearing and protective base. On the left and right sides of the housing 19, bearing mounting chambers 16 are integrally formed and protrude, corresponding to the assembly areas of the transmission belts 14 on both sides. The bearing mounting chambers 16 have reserved space for rotating and assembling various bearing structures supporting the driven shaft 1, achieving the positioning and rotational installation of the driven shaft 1, while simultaneously providing enclosed protection for the bearing structures. In the central area of ​​the housing 19 between the two bearing mounting chambers 16, a protruding transmission chamber 17 is also integrally formed. The transmission chamber 17 is a closed cavity structure, where all transmission structures, including the drive shaft 2, driven shaft 1, worm gear, and gear set, are centrally assembled. Through the integrated, partitioned structural design of the housing 19, the bearing mounting area and the transmission area are isolated from each other, resulting in high structural integration and good sealing, preventing wear and jamming of transmission components, and ensuring the long-term stable operation of the device's transmission system.

[0037] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A radiation monitoring and early warning device for the production process of radiopharmaceuticals, comprising a sensor (28) for detecting radiation intensity, characterized in that: The radiation sensor (28) is mounted on the driving device, which includes a housing (19), a pair of driven shafts (1) arranged in parallel on the left and right, and a drive shaft (2) located inside the housing (19) that drives the two driven shafts (1) simultaneously. The drive shaft (2) is connected to a power motor (7) mounted inside the housing (19) so that the two driven shafts (1) rotate around their own axes. The driven shaft (1) has drive wheels (13) fixed coaxially at both ends. Each set of drive wheels (13) facing each other has a transmission belt (14) around its outer side. Several suction cups (15) are evenly spaced on the outer side of the transmission belt (14) along its extension direction. The suction port of the suction cup (15) is away from the transmission belt (14) so ​​that when the drive shaft (2) rotates, it will drive the two transmission belts (14) forward through the two driven shafts (1). During the driving process, multiple suction cups (15) on each transmission belt (14) will simultaneously adhere to the surface of the nuclear drug production equipment, so that when the driving device travels freely on the surface of the nuclear drug production equipment, it can inspect the radiation value of the surrounding area.

2. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 1, characterized in that: The drive shaft (2) has a main worm gear (3) fixed coaxially in the center, and a section of end worm gear is fixed coaxially at both ends; the power motor (7) is vertically installed in the housing (19), the main shaft (5) of the power motor (7) is installed downward and the end is fixed with a main worm gear (4), the main worm gear (4) meshes with the main worm gear (3); the driven shaft (1) has a driven worm gear (12) fixed coaxially in the middle section, the driven worm gear (12) meshes with the end worm gear.

3. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 1, characterized in that: The transmission belt (14) is a track structure, and the suction cup (15) is fixed on the outside of the track chain plate, and one suction cup (15) is fixed on only one chain plate.

4. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 3, characterized in that: The chain plate is made of plastic, and the teeth on the inner surface of the chain plate that mesh with the drive wheel (13) are made of metal.

5. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 1, characterized in that: The transmission belt (14) is a synchronous toothed belt, and the suction cup (15) is fixed on the outer surface of the synchronous toothed belt and is integrally fixed with the synchronous toothed belt.

6. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 1, characterized in that: Four support columns are vertically fixed inside the housing (19). A rectangular bearing plate (10) is fixed at the top of the support columns. The bearing plate (10) has a threaded hole (18) in the center. The threaded hole (18) is used for the rectangular flange plate (11) at the end of the power motor (7) to be fixed by bolt connection. There is a through hole in the center of the flange plate (11). The main shaft (5) of the power motor (7) passes vertically downward through the through hole and then fixes the main worm gear (4).

7. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 1, characterized in that: The first gear (6) is coaxially fixed at the bottom end of the main worm gear (4). The first gear (6) meshes with the second gear (8) which is rotatably installed inside the housing (19). The gear shaft (9) of the second gear (8) is fixed with a third gear (20) at the upper end. The bottom end of the gear shaft (9) is rotatably installed in a thrust ball bearing (33) fixed at the bottom of the housing (19). The gear shaft (9) is rotatably installed in a deep groove ball bearing (34) near the third gear (20). The deep groove ball bearing (34) is fixed in the air near the inner wall of the housing (19) by a cantilever rod (35). A circular stepped rotating platform (21) is rotatably mounted at the top center of the housing (19). The rotating platform (21) has an internal gear structure (2101) coaxially integrated inside. The internal gear structure (2101) and the third gear (20) form an internal meshing transmission. The sensor (28) realizes dynamic rotation detection through the rotating platform (21).

8. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 7, characterized in that: Several connecting rods (30) are fixed in a circular array on the outer side of the rotating platform (21). The ends of the connecting rods (30) are fixed on the inner wall of a cylindrical protective cylinder (31). A circular and flexible cleaning ring (32) is coaxially fixed at the bottom end of the protective cylinder (31). When the cleaning ring (32) rotates, it wipes the area around the driving device clean.

9. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 7, characterized in that: The top of the rotary table (21) protrudes from the center of the top of the housing (19) and a rotary motor (22) is vertically fixed thereon. The output shaft (23) of the rotary motor (22) is set upward and a mounting plate (24) is fixed thereon. An automatic telescopic rod (25) is fixed on the side of the mounting plate (24). A mounting seat (26) with a central recess is fixed at the telescopic end of the automatic telescopic rod (25). The end of the sensor (28) away from the detection end (2801) is rotatably mounted in the groove of the mounting seat (26) through a rotating shaft (27). One end of the rotating shaft (27) is coaxially fixed with the motor shaft of a pitch motor (29) fixed outside the mounting seat (26) to realize the pitch swing of the sensor (28). The pitch angle of the sensor (28) allows the sensor's (2801) probe end to enter the protective glove of the nuclear drug production equipment and the corresponding sealing gap.

10. The radiation monitoring and early warning device for the radiopharmaceutical production process according to claim 7, characterized in that: The main body of the outer shell is a rectangular box structure. On the left and right sides of the outer shell, near the corresponding transmission belt (14), there are bearing mounting chambers (16) integrally formed. The bearing mounting chambers (16) are equipped with bearings for the driven shaft (1) to rotate. In the center between the two bearing mounting chambers (16), there is also a transmission chamber (17) integrally formed with the outer shell. The transmission chamber (17) is used to install the transmission structure for the drive shaft (2) and the driven shaft (1) to drive each other.

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