Carrier device for conveying radioactive source in pipeline

Abstract

The invention relates to the technical field of spent fuel post-treatment, and discloses a carrier device for conveying a radioactive source in a pipeline, which comprises a protective body for wrapping the radioactive source, the protective body is of a spherical structure, and the carrier device further comprises a fence assembly, two moving assemblies and a driving piece, the fence assembly comprises a beam rod which is horizontally arranged and has elastic toughness and baffle discs fixedly connected to the two ends of the beam rod, the beam rod is located on the upper portion of the baffle disc, the weight of the lower portion of the baffle disc is larger than that of the upper portion of the baffle disc, and a space cavity allowing the protective body to roll and preventing the protective body from disengaging is defined between the beam rod and the baffle disc. The moving assembly comprises wheel shafts, wheel seats fixedly connected with the wheel shafts in a sleeving mode and a plurality of guide wheels evenly distributed in the circumferential direction of the wheel seats, the maximum outer circle diameter defined by the guide wheels is larger than the maximum outer circle diameter of the blocking discs, and the driving part comprises a steel cable connected with one wheel shaft. The transportation stability can be improved.

Description

Technical Field

[0001] This invention relates to the field of spent fuel reprocessing technology, and in particular to a carrier device for transporting radioactive sources within a pipeline. Background Technology

[0002] In the field of spent fuel reprocessing, methods such as gamma absorption and neutron absorption are used to monitor nuclear radiation. Such measurements require the use of high-activity radioactive sources (source intensity can reach the level of hundreds of curies) as signal sources. Due to the high power of the radioactive sources, they are extremely dangerous, and their transportation, storage and use are very difficult.

[0003] To minimize the risk of leakage and radiation damage to workers during transport, carrier devices for radioactive sources are often transported using trolleys instead of manual labor. The use of pipelines further enhances safety. Heavier radioactive sources are typically wrapped in multiple layers of protective structures, such as radiation-blocking layers and protective bodies. During transport, the protective body containing the radioactive source is secured to the trolley using fixed components. The trolley then moves within the pipeline to transport the source until it reaches the end of the pipeline.

[0004] While existing transport trolleys can achieve automated forward transport, their numerous components, such as electrical control systems, battery modules, transmission mechanisms, and heavy metal trusses, significantly increase the weight of the carrier device. Furthermore, they occupy a large amount of space within the confined pipes. In addition, the radioactive source itself has considerable weight, and the trolley is connected to the source via a load-bearing, fixed method, further increasing its volume and weight. This makes it prone to slippage, jamming, or even slow, sluggish movement in curved or sloping pipe sections when the trolley is moving within the pipe. This undoubtedly prevents the carrier device from being transported on schedule, thus impacting the urgent nuclear radiation monitoring progress. Summary of the Invention

[0006] This invention provides a carrier device for transporting radioactive sources within a pipeline, which can improve the stability of transportation.

[0007] This invention provides a carrier device for transporting a radioactive source within a pipeline, comprising a protective body for enclosing the radioactive source. The protective body has a spherical structure. The carrier device further includes a containment assembly, two moving components, and a driving component. The containment assembly includes a horizontally arranged beam with elasticity and resilience, and baffles fixedly connected to the two ends of the beam. The beam is located above the baffles, and the lower part of the baffle has a greater weight than its upper part. The beam and the baffle form a space cavity for the protective body to roll while preventing it from falling out. The two moving components are arranged in a mirror image and are respectively connected to the two baffles. The moving components include an axle, a wheel seat fixedly connected to the axle, and a plurality of guide wheels evenly distributed along the circumference of the wheel seat. The maximum outer diameter of the circle formed by the guide wheels is greater than the maximum outer diameter of the baffles. The axle is rotatably connected to the baffles through a rotating part. The driving component includes a steel cable fixedly connected to the end of the axis of one of the axles. The steel cable is placed inside the pipeline. Under the action of the driving force, the steel cable is displaced along the extension direction of the pipeline and pushes the axle to move along the inside of the pipeline, thereby driving the protective body located in the space cavity to carry the radioactive source synchronously.

[0008] Preferably, the axle is stepped, and the two axles on both sides of the beam have their larger outer diameter sides far apart. The rotating part includes: multiple bearings and two sleeves. The multiple bearings are evenly fitted on the outer sides of the two axles with smaller outer diameters. The inner walls of the bearings are fixedly connected to the axles. The two sleeves are respectively fitted on the bearings on the two axles. The outer walls of the bearings are fixedly connected to the inner walls of the sleeves. The sleeves are fixedly connected to the bottom of the baffle.

[0009] Preferably, the protective body includes: a spherical core and a spherical shell. The spherical core includes hemispheres A and B, which have radiation-resistant properties, and there is a cavity between them to accommodate the radiation source. Hemispheres A and B are spliced ​​together by threaded connection, and an isolation layer is provided between the splicing end faces of the two. The spherical shell includes shell A and shell B, which can completely enclose the spherical core after being spliced ​​together. Shell A and shell B are spliced ​​together by threaded connection.

[0010] Preferably, the axle has through holes at positions along its central axis, and one of the through holes has an enlarged groove near the edge. The steel cable extends into the through hole with the enlarged groove, and a clamping component for clamping the steel cable is provided in the enlarged groove.

[0011] Preferably, the clamping assembly includes: a compression sleeve, multiple compression terminals, and a rear pressure cover. The compression sleeve is disposed in the expanded cavity and sleeved over the steel cable. When it undergoes axial compression, it provides radial force to lock the steel cable. The multiple compression terminals are all placed in the expanded cavity and are located at both ends of the compression sleeve, respectively, for transmitting axial force to the compression sleeve. The rear pressure cover is fixedly connected to the outer end of the wheel axle on the side where the steel cable is fixed by multiple bolts. An clearance hole is opened in the middle of the rear pressure cover corresponding to the steel cable. The inner wall of the rear pressure cover presses against the compression terminals close to the edge.

[0012] Preferably, the number of bearings on each axle is greater than or equal to 2, and a metal gasket is provided between two adjacent bearings.

[0013] Preferably, both hemisphere A and hemisphere B are radiation-resistant insulating materials of polyimide (PI), polysulfone (PSU), or polyetheretherketone (PEEK).

[0014] Preferably, a T-shaped collision joint for contacting an obstacle at the end of the pipe is provided at the through hole on the front side of the axle away from the rear cover, and an electrical conduction component for providing power to the collision joint is also included.

[0015] Preferably, the front end of the wheel axle on which the collision joint is installed is bolted to a front pressure cover, and the front pressure cover has a clearance hole corresponding to the collision joint, so that the smaller diameter part of the collision joint can pass through.

[0016] Preferably, each of the two axles is provided with an end cap at one end of the side that is close to each other, which is used to limit the displacement of their respective bearings. The end cap is connected to the end of each axle by bolts.

[0017] Preferably, the electrical conduction assembly includes: two insulating sleeves, two fixed flanges, and two connecting plates. Both insulating sleeves are inserted into the axle through-hole near the impact joint. The end of the impact joint extending into the through-hole is slidably connected to one of the adjacent insulating sleeves. The other insulating sleeve is closer to the baffle than the impact joint and is slidably connected to a contact pin for conducting electricity. The contact pin is electrically connected to the impact joint. The two fixed flanges are respectively connected through the middle of the two baffles, and a through-hole is formed between the two fixed flanges. Both connecting plates are fixedly connected to the two fixed flanges by ball-head plungers. The contact pin contacts and is electrically connected to the adjacent connecting plate. The other end of the two connecting plates extends upward to the beam rod, which is a hollow tubular structure. The two connecting plates are electrically connected by a wire. The connecting plate near the steel cable is electrically connected to the steel cable through a metal pin and a contact plate.

[0018] The contact pin, ejector pin, and collision connector can all move within their respective tracks, and each is connected to a spring for applying elastic compensation.

[0019] Compared with existing technologies, the advantages of this invention are as follows: Existing carrier devices can achieve automated forward conveying, and the carrier device itself does not have excessive electrical control components, battery modules, complex transmission mechanisms, or heavy metal trusses, which greatly increases the weight of the carrier device itself. Even in narrow pipe spaces, it can achieve the conveying of radioactive sources. Compared with existing technologies that use a load-bearing and fixing method, this device uses a spherical and sealed protective body to form a space cavity between the beam and the baffle, allowing the protective body to roll and preventing it from falling out. The protective body of the radioactive source rolls along this cavity, and the front and rear baffles can limit the movement of the protective body. When moving to uphill or downhill pipe sections, This device ensures the stability of the protective body's rolling motion. Furthermore, by improving the structure and method of transport, it further reduces the device's volume and weight, enabling it to smoothly and quickly pass through pipe sections with bends and upward slopes. The moving components are mirror-shaped, ensuring stability at both ends. Multiple evenly distributed guide wheels around the wheel base maximize the contact area with the pipe wall compared to traditional trolleys, minimizing slippage. This not only solves slippage, jamming, and slow movement but also ensures more stable transport by utilizing the contact between the multiple guide wheels and the pipe wall, guaranteeing the timely delivery of the radioactive source and preventing disruption to subsequent urgent nuclear radiation monitoring. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a carrier device for transporting a radioactive source inside a pipeline, provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the internal cross-sectional structure of a carrier device for transporting a radioactive source inside a pipeline, provided in an embodiment of the present invention. Figure 3 A schematic diagram from the front view of a carrier device for transporting a radioactive source inside a pipeline, provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the encapsulation process of the protective body in a carrier device for transporting a radioactive source inside a pipeline, provided in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Protective body; 11. Ball core; 12. Ball shell; 2. Enclosure assembly; 21. Beam rod; 22. Baffle plate; 3. Moving assembly; 31. Wheel axle; 311. Through hole; 312. Enlarged hole groove; 32. Wheel seat; 33. Guide wheel; 34. Rotating part; 341. Bearing; 342. Sleeve body; 4. Steel cable; 5. Clamping assembly; 51. Compression sleeve; 52. Compression terminal; 53. Rear pressure cover; 6. Gasket; 7. Collision joint; 8. Electrical conduction assembly; 81. Insulating sleeve; 82. Contact pin; 83. Fixing flange; 84. Wiring guide plate; 85. Ejector pin; 86. Contact piece; 87. Spring; 9. Front pressure cover; 10. End cover. Detailed Implementation

[0023] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and 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 this invention.

[0025] refer to Figure 1 , Figure 2 and Figure 3This invention provides a carrier device for transporting a radioactive source within a pipeline, comprising a protective body 1 for enclosing the radioactive source. The protective body 1 has a spherical structure. The carrier device further includes a containment assembly 2, two moving components 3, and a driving component. The containment assembly 2 includes a horizontally arranged beam 21 with elasticity and toughness, and baffles 22 fixedly connected to the two ends of the beam 21. The beam 21 is located above the baffles 22, and the lower part of the baffles 22 has a greater weight than its upper part. The beam 21 and the baffles 22 form a space cavity for the protective body 1 to roll and prevent it from falling out. The two moving components 3 are mirror-arranged, and each... Connected to two baffles 22, the moving component 3 includes an axle 31, a wheel seat 32 fixedly connected to the axle 31, and a plurality of guide wheels 33 evenly distributed around the wheel seat 32. The maximum outer diameter of the guide wheels 33 is larger than the maximum outer diameter of the baffle 22. The axle 31 is rotatably connected to the baffle 22 through a rotating part 34. The driving component includes a steel cable 4 fixedly connected to the end of the axis of one of the axles 31. When the steel cable 4 is placed in the pipe, the steel cable 4 is displaced along the extension direction of the pipe under the action of the driving force, and pushes the axle 31 to move along the inside of the pipe, so as to drive the protective body 1 located in the space cavity to carry the radiation source synchronously.

[0026] In the above embodiments, the existing carrier device can achieve automated forward conveying. Moreover, the carrier device itself does not require excessive electrical control components, battery modules, complex transmission mechanisms, or heavy metal trusses, significantly reducing its own weight. Even within confined pipe spaces, it can still convey radioactive sources. Compared to existing technologies that use a fixed, load-bearing method, this device uses a spherical and sealed protective body 1 to create a space between the beam 21 and the baffle 22, allowing the protective body 1 to roll while preventing it from detaching. The protective body 1 rolls within this space, and the front and rear baffles 22 limit its movement. When moving to uphill or downhill pipe sections, the protective body remains secure. The device improves the stability of the rolling motion of the body 1. Furthermore, by improving the structure and method of transportation, the device's volume ratio and counterweight are further reduced, ensuring that the device can smoothly and quickly pass through pipe sections with bends and upward slopes. The moving component 3 of the device is set in a mirror image, which can ensure the stability of the head and tail. Moreover, multiple evenly distributed guide wheels 33 are set around its wheel seat 32. Compared with traditional trolleys, it can maximize the contact area with the inner wall of the pipe, thereby minimizing slippage. This not only solves the problems of slippage, jamming, and slow movement, but also makes the transportation more stable by relying on the contact between the multiple guide wheels 33 and the pipe wall. This ensures that the radioactive source is transported according to the predetermined time and will not affect the subsequent urgent nuclear radiation monitoring progress.

[0027] Specifically, the steel cable 4 of the present invention is made of semi-flexible radiation-resistant glass material, which includes steel wire, glass fiber, high-strength polyester fiber, etc. It can adapt to the bends in the pipeline. It not only has a certain toughness and can adapt to the bending of the pipeline to deform, but also has a certain rigidity and can provide a stable driving force. In this embodiment, the driving source of the steel cable 4 is selected to drive the pressure roller mechanism to rotate, thereby controlling the movement of the steel cable 4 into the pipeline. The radiation-resistant insulation material can maintain its performance for a long time under high radiation to avoid safety hazards. The guide wheel 33 is provided with an anti-slip rubber layer on the contact surface with the pipeline.

[0028] Further, refer to Figure 2 The axle 31 is stepped, and the two axles 31 located on both sides of the beam 21 are far apart on the side with the larger outer diameter. The rotating part 34 includes: multiple bearings 341 and two sleeves 342. The multiple bearings 341 are evenly sleeved on the outer side of the two axles 31 with the smaller outer diameter. The inner wall of the bearing 341 is fixedly connected to the axle 31. The two sleeves 342 are respectively sleeved on the bearings 341 on the two axles 31. The outer wall of the bearing 341 is fixedly connected to the inner wall of the sleeve 342. The sleeve 342 is fixedly connected to the bottom of the baffle 22.

[0029] In the above embodiments, by limiting the axle 31 to a stepped shape, the stepped portion can limit the bearing 341 in one direction. Moreover, the outer diameter of the selected bearing 341 is smaller than the larger outer diameter of the axle 31. In conjunction with the sleeve 342, it can be kept as close as possible to the larger outer diameter of the axle 31, which meets the design standards and aesthetics between components. At the same time, it will not have any impact on practical applications. The bearing 341 can enable the baffle 22 and the beam 21 to rotate freely. Since the lower part of the baffle 22 is heavier than its upper part, it can ensure that when the device moves to the turning point, the heavier side of the baffle 22 always remains vertically downward, and the beam 21 is always on top to ensure a stable connection. In addition, it can ensure that the spherical protective body 1 carrying the radiation source will not fall out of the space cavity.

[0030] Further, refer to Figure 2 The protective body 1 includes a spherical core 11 and a spherical shell 12. The spherical core 11 includes a hemisphere A and a hemisphere B with radiation resistance characteristics, and there is a cavity between them to accommodate the radiation source. The hemisphere A and the hemisphere B are spliced ​​together by threaded connection, and an isolation layer is provided between the splicing end faces of the two. The spherical shell 12 includes a shell A and a shell B. After the two are spliced ​​together, they can completely enclose the spherical core 11. The shell A and the shell B are spliced ​​together by threaded connection.

[0031] In the above embodiments, such as Figure 4 As shown, after the spherical core 11 is installed, its spherical shell 12 can be locked using a tool, such as... Figure 1As shown, the outer parts of housing A and housing B are provided with insertion holes to facilitate the insertion of the probe in the locking tool. Housing A is placed in the groove of the locking tool base, and the probe in the groove extends into the insertion hole of housing A. Then, a wrench with a flange probe is inserted into the upper insertion hole of housing B. The sealing is then tightened by turning the lever of the wrench.

[0032] Further, refer to Figure 2 The axle 31 has through holes 311 at each position along its central axis, and one of the through holes 311 has an enlarged groove 312 near the edge. The steel cable 4 extends into the through hole 311 with the enlarged groove 312. The enlarged groove 312 is provided with a clamping component 5 for clamping the steel cable 4.

[0033] In the above embodiments, the clamping component 5 provided in this device can prevent the steel cable 4 from loosening, ensure the stability of transmission, improve the overall stability, accuracy and adaptability of the conveying, reduce human intervention and reduce the risk of radiation.

[0034] Further, refer to Figure 2 The clamping assembly 5 includes: a compression sleeve 51, multiple compression terminals 52, and a rear pressure cover 53. The compression sleeve 51 is disposed in the enlarged cavity and sleeved on the outside of the steel cable 4. When it is axially compressed, it provides radial force to lock the steel cable 4. The multiple compression terminals 52 are all placed in the enlarged cavity and are respectively located at both ends of the compression sleeve 51 to transmit axial force to the compression sleeve 51. The rear pressure cover 53 is fixedly connected to the outer end of the wheel axle 31 on the side of the fixed steel cable 4 by multiple bolts. The middle part of the rear pressure cover 53 is provided with a clearance hole corresponding to the part of the steel cable 4. The inner wall of the rear pressure cover 53 presses the compression terminals 52 close to the edge.

[0035] In the above embodiments, when the rear pressure cover 53 is connected and locked to the tail axle 31 by screws, the compression sleeve 51 and the compression terminal 52 generate radial force to further lock the steel cable 4, thereby achieving the fixation of the steel cable 4.

[0036] Further, refer to Figure 1 and Figure 2 Each axle 31 has a bearing 341 of greater than or equal to 2, and a metal gasket 6 is provided between two adjacent bearings 341.

[0037] In the above embodiments, the shims 6 serve to block two adjacent bearings 341, reduce the degree of mutual wear between the bearing bodies 341, and improve the rotational stability by limiting the number of shims.

[0038] Furthermore, both hemisphere A and hemisphere B are made of radiation-resistant insulating materials such as polyimide (PI), polysulfone (PSU), or polyether ether ketone (PEEK). Specifically, components such as compression sleeve 51 and compression terminal 52 are also made of the above materials.

[0039] In the above embodiments, radiation resistance can be ensured. Specifically, this device is mainly designed for high-activity sources of Class 5 or above. This embodiment uses a 600Ci Co-60 source, which is a Class II source. The dose rate of the Co-60 source to the carrier is 2700Gy / h. This device operates 24 hours a day in a certain equipment room, where the dose rate is 1000Gy / h. The equipment has two months of maintenance time per year. Therefore, the annual working time of the radiation source mobile radiation-resistant carrier device is 24×30×10=7200h, and the annual cumulative dose is 7200h×(2700Gy / h+1000Gy / h)≈2.7×107Gy. This device must be guaranteed to be problem-free for three years. Therefore, the radiation-resistant dose of the material must be greater than 8.1×107Gy. The radiation-resistant dose of PEEK material is 1×108Gy. In this embodiment, PEEK material is preferred as the radiation-resistant insulating material.

[0040] Further, refer to Figure 2 and Figure 3 A T-shaped collision joint 7 for contacting obstacles at the end of the pipe is provided at the through hole 311 on the front side of the axle 31 away from the rear pressure cover 53, and an electrical conduction component 8 for providing power to the collision joint 7 is also included.

[0041] Further, refer to Figure 2 The front end of the axle 31 on which the collision joint 7 is installed is connected to a front pressure cover 9 by bolts. The front pressure cover 9 has a clearance hole corresponding to the collision joint 7, which is used to allow the smaller part of the collision joint 7 to pass through.

[0042] In the above embodiments, the front pressure cover 9, together with the T-shaped collision joint 7, serves to block the front end of the front wheel axle 31 to prevent the collision joint 7 from coming off.

[0043] Further, refer to Figure 2 and Figure 3 Each of the two axles 31 has an end cap 10 at one end of its side that is close to each other, which is used to limit the displacement of its respective bearing 341. The end cap 10 is connected to the end of its respective axle 31 by bolts.

[0044] In the above embodiments, the end cap 10 serves to limit the bearing 341, and it is detachably fastened by six bolts.

[0045] Further, refer to Figure 2The electrical conduction assembly 8 includes: two insulating sleeves 81, two fixed flanges 83, and two connecting plates 84. Both insulating sleeves 81 are inserted into the through holes 311 of the axle 31 near the impact joint 7. The end of the impact joint 7 extending into the through hole 311 is slidably connected to one of the adjacent insulating sleeves 81. The other insulating sleeve is closer to the baffle 22 than the impact joint 7 and is slidably connected to a contact pin 82 for conducting electricity. The contact pin 82 is electrically connected to the impact joint 7. The two fixed flanges 83 are respectively inserted into the axle 31 through holes 311. A through hole is formed between the two fixed flanges 83 and connected to the middle of the two baffles 22. The two connecting plates 84 are fixedly connected to the two fixed flanges 83 by ball plungers. The contact pin 82 contacts the adjacent connecting plate 84 and is electrically connected. The other end of the two connecting plates 84 extends upward to the beam rod 21. The beam rod 21 is a hollow tube. The two connecting plates 84 are electrically connected by wires. The connecting plate 84 near the steel cable 4 is electrically connected to the steel cable 4 by a metal pin 85 and a contact plate 86.

[0046] The contact pin 82, the ejector pin 85, and the collision joint 7 can all move within their respective slides, and each is connected to a spring 87 for applying elastic compensation.

[0047] In the above embodiments, the present invention, through the electrical conduction component 8, can ensure that the carrier device does not enter the orange or red zone, and can accurately control and position the location after the delivery is completed. This greatly reduces the workload, improves the convenience of operation, facilitates the determination of the position by personnel, avoids manual judgment of the position, and effectively reduces the radiation dose received by personnel. Among them, the collision connector 7 and the contact needle 82 are connected by wiring. The contact needle 82 is connected to the top needle 85 through the buffer of the corresponding spring 87 via the wiring guide 84, and is connected to the steel cable 4 through the contact piece 86, so as to realize the conduction of the entire radiation source moving radiation-resistant carrier device.

[0048] Usage and working principle: When entering the pipeline, place the radiation source encapsulation body directly below the beam 21 and between the two baffles 22. Its protective body 1 rolls as the radiation source moves and the radiation-resistant carrier device moves. The outer ring of the guide wheel 33 of the radiation source moving radiation-resistant carrier device contacts the inner wall of the pipeline. Its movement is controlled by the steel cable 4, preventing jamming or difficulty in turning. The front collision connector 7 and contact pin 82 are connected by wiring. The contact pin 82 is then buffered by the corresponding spring 87 and guided by the wiring guide plate 84 to the push pin 85. The circuit is connected to the steel cable 4 via the contact piece 86, thus enabling the entire mobile radiation-resistant carrier device to be conductive. At the same time, the circuit is protected against radiation and insulated by components such as the sleeve body 342 and the compression sleeve 51. In actual operation, when the mobile radiation-resistant carrier device reaches the end of the pipeline, the collision joint 7 senses the collision and transmits the electrical signal. Finally, the current signal is transmitted to the PLC via the steel cable 4. The PLC controls the steel cable 44 through instructions to achieve precise position control and positioning, ensuring that the position error is controlled within ±3mm.

[0049] In summary, the carrier device provided in this embodiment can realize the delivery and use of high-activity radioactive sources in certain locations in the field of spent fuel reprocessing. It solves the problems of poor stability, easy insulation failure under radiation environment, complex installation and maintenance, and high risk of personnel irradiation. It achieves stable and accurate delivery of radioactive sources and has the characteristics of reliable structure, strong adaptability, and easy maintenance. It not only ensures radiation safety and personnel safety, but also simplifies operation and provides effective support for radioactive source control in radiochemical analysis.

[0050] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A carrier device for transporting a radioactive source within a pipeline, comprising a protective body for enclosing the radioactive source, characterized in that, The protective body has a spherical structure, and the carrier device further includes: The enclosure assembly includes a horizontally arranged beam with elasticity and toughness and baffles fixedly connected to both ends of the beam. The beam is located above the baffle, and the lower part of the baffle has a greater weight than its upper part. The beam and the baffle form a space cavity for the protective body to roll and prevent it from falling out. Two movable components are mirror-arranged and each is connected to two baffles. Each movable component includes an axle, a wheel seat fixedly connected to the axle, and a plurality of guide wheels evenly distributed around the wheel seat. The maximum outer diameter of the guide wheels is larger than the maximum outer diameter of the baffles. The axle is rotatably connected to the baffles via a rotating part. The driving component includes a steel cable fixedly connected to the end of the axis of one of the wheel axles. The steel cable is placed inside the pipe. Under the action of the driving force, the steel cable is displaced along the extension direction of the pipe and pushes the wheel axle to travel along the inside of the pipe, so as to drive the protective body located in the space cavity to carry the radiation source synchronously.

2. The carrier device for transporting a radioactive source within a pipeline as described in claim 1, characterized in that, The axle is stepped, and the two axles on either side of the beam with larger outer diameters are far apart from each other. The rotating part includes: Multiple bearings are evenly fitted onto the outer sides of the two axles with the smaller outer diameter, and the inner walls of the bearings are fixedly connected to the axles. Two sleeves are respectively fitted onto the bearings mounted on two wheel axles. The outer wall of the bearing is fixedly connected to the inner wall of the sleeve, and the sleeve is fixedly connected to the bottom of the baffle.

3. The carrier device for transporting a radioactive source within a pipeline as described in claim 1, characterized in that, The protective body includes: The spherical core includes hemispheres A and B, which have radiation resistance properties, and a cavity is left between them to accommodate the radiation source. Hemispheres A and B are spliced ​​together by threaded connection, and an isolation layer is provided between the splicing end faces of the two. The spherical shell includes shell A and shell B, which, when joined together, can completely enclose the spherical core. Shell A and shell B are joined together by a threaded connection.

4. The carrier device for transporting a radioactive source within a pipeline as described in claim 1, characterized in that, The axle has through holes at each position along its central axis, and one of the through holes has an enlarged groove near the edge. The steel cable extends into the through hole with the enlarged groove, and a clamping component for clamping the steel cable is provided in the enlarged groove.

5. The carrier device for transporting a radioactive source within a pipeline as described in claim 4, characterized in that, The clamping assembly includes: A compression sleeve, disposed in the enlarged cavity and sleeved on the outside of the steel cable, provides a radial force to lock the steel cable when it undergoes axial compression; Multiple compression terminals are placed in the expansion cavity and located at both ends of the compression sleeve, used to transmit axial force to the compression sleeve; The rear pressure cover is fixedly connected to the outer end of the wheel axle on one side of the fixed steel cable by multiple bolts. The middle part of the rear pressure cover is provided with a clearance hole corresponding to the steel cable. The inner wall of the rear pressure cover presses against the compression terminal close to the edge.

6. The carrier device for conveying a radioactive source within a pipeline as described in claim 2, characterized in that, Each of the wheel axles has at least two bearings, and a metal gasket is provided between two adjacent bearings.

7. The carrier device for transporting a radioactive source within a pipeline as described in claim 2, characterized in that, Both hemisphere A and hemisphere B are radiation-resistant insulating materials made of polyimide, polysulfone, or polyetheretherketone.

8. The carrier device for transporting a radioactive source within a pipeline as described in claim 5, characterized in that... A T-shaped collision joint for contacting an obstacle at the end of the pipe is provided at the through hole on the front side of the wheel axle away from the rear pressure cover, and an electrical conduction component for providing power to the collision joint is also included.

9. The carrier device for conveying a radioactive source within a pipeline as described in claim 8, characterized in that, The front end of the wheel axle on which the collision joint is installed is bolted to a front pressure cover. The front pressure cover has an clearance hole corresponding to the collision joint, which is used to allow the smaller diameter part of the collision joint to pass through.

10. The carrier device for conveying a radioactive source within a pipeline as described in claim 4, characterized in that, Each of the two axles has an end cap at one end of its side that is close to the other, which is used to limit the displacement of its respective bearing. The end cap is bolted to the end of each axle.

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