Device for detecting radioactive activity of nuclear waste cargo package

Abstract

The utility model provides a device for detecting the radioactive activity of a nuclear waste cargo package, and relates to the technical field of radioactive activity detection.The device comprises a support body, a hollow motor, a rotating disc, a positioning structure and a detection probe, and the hollow motor is vertically and fixedly arranged on the support body and is provided with a center channel passing through the center axis of the support body; the turntable is rotationally connected to the bracket body, and is coaxially and fixedly connected with the power output end of the hollow motor; the positioning structure is fixedly arranged on the turntable and is coaxial with the turntable and the hollow motor; and the detection probe extends to the bottom of the turntable through the central channel and is correspondingly positioned below the positioning structure. The device is simple in structure and low in failure rate, the rotating driving efficiency and the angle control precision are improved through the mode that the hollow motor directly drives the rotating disc, the overall structural complexity of the device is reduced, the operation stability and reliability of the device can be improved, detection is convenient and efficient, and the use cost and the later maintenance treatment cost of a user are reduced.

Description

Technical Field

[0001] This application relates to the technical field of radioactivity detection, and particularly to a device for detecting the radioactivity of nuclear waste packages. Background Art

[0002] During the operation, maintenance, and disposal of nuclear power plant nuclear power units, some radioactive nuclear wastes will be generated, such as waste resin, waste filters, chemical waste liquids, etc. These nuclear wastes are generally treated by processes such as cement solidification, hot compaction, or filling HIC dehydration, and stored in 200L or 400L waste barrels or HIC containers, and stored in the form of nuclear waste packages. With the continuous operation of nuclear power plants, the quantity of generated nuclear waste packages is also increasing. According to the requirements of national standards, after the formation of nuclear waste packages, radioactivity detection is required to confirm the effectiveness of the functions of radioactive nuclear waste disposal facilities through monitoring and inspection, and to ensure the safety of radioactive nuclear waste disposal facilities.

[0003] At present, nuclear power plants mainly use radioactivity measurement equipment to detect the radioactivity of nuclear waste packages. Such equipment drives the nuclear waste packages to rotate at multiple angles through a rotating device, so as to detect each angular area of the package one by one through a detection probe, and avoid the deviation of detection results caused by the uneven distribution of radioactive substances in the package. Existing radioactivity measurement equipment, such as the large-volume radioactive waste barrel multi-functional multi-mode measurement device disclosed in Chinese Patent Publication No. CN117233819A, uses a multi-dimensional driving method of horizontal movement, lifting movement, and rotational movement to achieve various scanning modes such as point scanning, vertical scanning, layer scanning, and spiral scanning of the waste package. The structure is relatively complex, the cost is relatively high, and the complex structure leads to a relatively high failure rate, and the cost of use and maintenance and disposal is relatively high. Summary of the Utility Model

[0004] In order to solve the above technical problems, this application provides a device for detecting the radioactivity of nuclear waste packages, which solves the technical problems of the complex structure, high failure rate, and relatively high cost of use and maintenance and disposal of existing devices. The device for detecting the radioactivity of nuclear waste packages provided by this application has a simple structure, a low failure rate, is convenient and efficient for detection, and reduces the cost of use and later maintenance and disposal for users.

[0005] The technical solution adopted by this application to solve its technical problems is: to provide a device for detecting the radioactivity of nuclear waste packages, including a support body, a hollow motor, a turntable, a positioning structure and a detection probe arranged on the support body. The hollow motor is vertically fixed on the support body and has a central channel passing through the central axis of the support body; the turntable is rotatably connected to the support body and is coaxially fixedly connected to the power output end of the hollow motor to rotate under the direct drive of the hollow motor; the positioning structure is fixed on the turntable and is coaxial with the turntable and the hollow motor to position and limit the nuclear waste package; the detection probe extends through the central channel to the bottom of the turntable and is correspondingly located below the positioning structure to detect the radioactivity of the nuclear waste package.

[0006] In some embodiments, the device further includes a slewing bearing seat and a slewing bearing. The slewing bearing seat is fixed in the support body and coaxially sleeved outside the hollow motor; the slewing bearing is installed in the slewing bearing seat and rotates relative to the slewing bearing seat; the turntable is rotatably connected to the slewing bearing seat through the slewing bearing.

[0007] In some embodiments, the slewing bearing includes an outer bearing ring and an inner bearing ring. The outer bearing ring is located on the top of the slewing bearing seat and is coaxially fixedly connected to the slewing bearing seat through fasteners; the inner bearing ring is rotatably connected to the inside of the outer bearing ring and is vertically offset from the outer bearing ring; the turntable is located on the inner bearing ring and is coaxially fixedly connected to the inner bearing ring through fasteners.

[0008] In some embodiments, the slewing bearing is a crossed roller bearing.

[0009] In some embodiments, the device further includes a coupling structure, which is coaxially fixedly connected between the power output end of the hollow motor and the turntable to transmit the output torque of the hollow motor to the turntable.

[0010] In some embodiments, a probe cavity communicating with the central channel is formed in the middle of the coupling structure, and the detection probe is located in the probe cavity.

[0011] In some embodiments, a maintenance opening corresponding to the upper part of the probe cavity is formed at the center of the turntable, and a cover plate is detachably installed on the maintenance opening.

[0012] In some embodiments, the nuclear waste package includes a HIC container and a waste barrel. The positioning structure includes a HIC centering member movably sleeved around the outer periphery of the bottom of the HIC container and a barrel centering member movably sleeved around the outer periphery of the bottom of the waste barrel. The HIC centering member is detachably and coaxially fixedly connected to the turntable to vertically limit the HIC container. The barrel centering member is detachably and coaxially fixedly connected to the turntable and relatively located in the middle of the HIC centering member to vertically limit the waste barrel.

[0013] In some embodiments, the hollow motor is a servo motor. The device further includes a control module electrically connected to the hollow motor to control the rotation angle and speed of the turntable.

[0014] In some embodiments, the device further includes a weighing module disposed between the support body and the support surface supporting the support body and electrically connected to the control module to measure the weight of the nuclear waste package.

[0015] The beneficial effects of the present application are as follows: The device for detecting the radioactivity of a nuclear waste package provided by the present application directly drives the turntable to rotate relative to the support body through a hollow motor, and drives the nuclear waste package to rotate at multiple angles through the positioning structure provided on the turntable, so as to facilitate the detection probe extending to the bottom of the turntable through the central channel to detect each angular area of the nuclear waste package one by one, avoiding the deviation of the detection results caused by the non-uniform distribution of radioactive substances. The form of the hollow motor directly driving the turntable in the device of the present application improves the rotation drive efficiency and angle control accuracy, reduces the overall structural complexity of the device, can improve the operation stability and reliability of the device, reduce the device failure rate, and can effectively reduce the use and later maintenance and disposal costs of users. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, where:

[0017] Figure 1 is a schematic diagram of the combined state structure for detecting a nuclear waste package in one embodiment of the device of the present application;

[0018] Figure 2 is a schematic diagram of the overall structure of one embodiment of the device of the present application;

[0019] Figure 3 is a schematic diagram of the structural decomposition of one embodiment of the device of the present application;

[0020] Figure 4 It is a schematic cross-sectional structure diagram of one embodiment of the device of the present application in the vertical plane;

[0021] Figure 5 It is a schematic structure diagram of the turntable of one embodiment of the device of the present application;

[0022] Figure 6 It is a schematic structure diagram of the slewing bearing of one embodiment of the device of the present application;

[0023] Figure 7 It is a schematic structure diagram of the coupling structure of one embodiment of the device of the present application.

[0024] In the figure: 100. Nuclear waste package, 1. Bracket body, 11. Bottom bracket, 12. Protection shell, 121. Shell bottom plate, 122. Installation groove, 123. Communication port, 124. Shell top plate, 125. Turntable port, 13. First threaded fastener, 14. Probe bracket, 15. Second threaded fastener, 16. Third threaded fastener, 17. Fourth threaded fastener, 18. Fifth threaded fastener, 2. Hollow motor, 21. Central channel, 22. Power output end, 23. Eighth fixing hole, 3. Turntable, 31. Fixed ring, 32. Fourth fixing hole, 33. Seventh fixing hole, 34. Maintenance opening, 35. Cover plate, 4. Positioning structure, 41. HIC centering member, 411. HIC bracket, 412. HIC support leg, 42. Barrel centering member, 421. Barrel bracket, 422. Barrel support leg, 423. Bracket opening, 5. Detection probe, 6. Slewing bearing seat, 61. Outer ring positioning groove, 62. First fixing hole, 7. Slewing bearing, 71. Bearing outer ring, 711. Second fixing hole, 72. Bearing inner ring, 721. Third fixing hole, 73. Roller, 8. Coupling structure, 81. Outer edge, 82. Fifth fixing hole, 83. Channel opening, 84. Sixth fixing hole, 85. Probe cavity, 9. Weighing module, 10. Central axis. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. According to the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] Please refer to Figures 1 to 3, this application provides a device for detecting the radioactivity of nuclear waste packages. The device includes a support body 1, a hollow motor 2, a turntable 3, a positioning structure 4, and a detection probe 5 provided on the support body 1. Among them, the hollow motor 2 is vertically fixedly connected inside the support body 1 and has a central passage 21 passing through the central axis 10 of the support body 1. The central passage 21 is formed on the rotor (not labeled) of the hollow motor 2. The turntable 3 is an overall horizontally arranged disc-shaped structure, rotatably connected to the support body 1, and the turntable 3 is coaxially fixedly connected to the power output end 22 of the hollow motor 2 to horizontally rotate relative to the support body 1 under the direct drive of the hollow motor 2. The positioning structure 4 is fixedly connected to the turntable 3 and is coaxial with the turntable 3 and the hollow motor 2 to position and limit the nuclear waste package 100. The detection probe 5 extends through the central passage 21 on the hollow motor 2 to the bottom of the turntable 3 and is correspondingly located below the positioning structure 4 to detect the radioactivity of the nuclear waste package 100 from the bottom.

[0027] The device for detecting the radioactivity of nuclear waste packages provided by this application directly drives the turntable 3 to rotate relative to the support body 1 by the hollow motor 2, and drives the nuclear waste package 100 to rotate at multiple angles through the positioning structure 4 provided on the turntable 3, so as to facilitate the detection probe 5 extending to the bottom of the turntable 3 through the central passage 21 to detect each angular region of the nuclear waste package 100 one by one, and avoid the deviation of the detection result caused by the non-uniform distribution of radioactive substances. The form of the hollow motor 2 directly driving the turntable 3 in the device of this application improves the rotation drive efficiency and angle control accuracy, reduces the overall structural complexity of the device, can improve the operation stability and reliability of the device, reduce the device failure rate, and can effectively reduce the use and later maintenance and disposal costs of users.

[0028] Please refer to Figures 2 to 4 , in a specific embodiment, the support body 1 includes a bottom support 11 and a protective housing 12. The bottom support 11 is preferably a beam-type structure fixedly connected by steel bars arranged horizontally and vertically, which plays a bottom support role. The protective housing 12 is preferably a hollow housing structure fixedly connected by multiple steel plates, which is located on the bottom support 11 and is fixedly connected to the bottom support 11 as a whole through the first threaded fasteners 13. The bottom plate of the protective housing 12 is preferably a thick steel plate to ensure the stable support of each component on the support body 1.

[0029] The support body 1 of the device of this application adopts a split structure design, with the bottom support 11 as the main support structure to support and fix the protective housing 12. The structure is simple, easy to disassemble and assemble, convenient for later maintenance and disposal, and has high overall structural strength, ensuring the stable support of each component of the device and the nuclear waste package 100.

[0030] Preferably, the protective housing 12 includes a housing bottom plate 121. A mounting groove 122 for positioning and mounting the hollow motor 2 is provided in the middle of the housing bottom plate 121. A communication port 123 for communicating the space of the bottom bracket 11 with the central channel 21 is penetratingly opened at the center of the mounting groove 122. The hollow motor 2 is positioned in the middle of the housing bottom plate 121 through the mounting groove 122 and is fixedly connected to the housing bottom plate 121 and the bottom bracket 11 by fasteners (not shown). This structural design enables the strip-shaped probe bracket 14 to extend from the bottom of the bottom bracket 11 through the communication port 123 and the central channel 21 of the hollow motor 2 into the protective housing 12 and extend below the bottom of the turntable 3, so as to relatively fix the detection probe 5 in the protective housing 12 through the probe bracket 14, enabling the detection probe 5 to correspond to the bottom of the nuclear waste package 100 for radioactive activity detection and facilitating the cable routing of the detection probe 5. A turntable opening 125 for exposing the turntable 3 is provided on the housing top plate 124 of the protective housing 12. The inner diameter of the turntable opening 125 is slightly larger than the outer diameter of the turntable 3 to limit the size of the gap between the turntable 3 and the turntable opening 125 and prevent external objects from entering the protective housing 12 through the gap.

[0031] Please refer to Figures 3 to 4 , in a specific embodiment, the device of the present application further includes a slewing bearing seat 6 and a slewing bearing 7. The slewing bearing seat 6 is fixedly provided in the protective housing 12 of the support body 1, and the slewing bearing seat 6 is coaxially sleeved outside the hollow motor 2. The slewing bearing 7 is installed on the slewing bearing seat 6 and can rotate relative to the slewing bearing seat 6. The turntable 3 is rotatably connected to the slewing bearing seat 6 through the slewing bearing 7.

[0032] The device of the present application connects the turntable 3 and the slewing bearing 7 through the slewing bearing seat 6. While enabling the turntable 3 to rotate horizontally freely relative to the support body 1, it can transmit the axial force from the nuclear waste package 100 to the bottom bracket 11 through the turntable 3, the slewing bearing 7, and the slewing bearing seat 6, avoiding the axial load from the nuclear waste package 100 being borne by the power output end 22 of the hollow motor 2 during detection and ensuring the stable and high-precision operation of the hollow motor 2.

[0033] Preferably, the slewing bearing 7 is a crossed roller bearing, which can provide relatively high rotational accuracy and stiffness in a relatively small space to ensure the precise rotational drive of the hollow motor 2 for the turntable 3.

[0034] Please refer to Figures 3 to 6In a specific embodiment, the slewing bearing seat 6 is preferably a circular ring structure welded from I-beams, and the bottom is fixedly connected to the bottom plate of the protective shell 12 by a first threaded fastener 13. In this way, the protective shell 12 can be fixedly connected to the bottom bracket 11 while fixing the slewing bearing seat 6, which reduces the complexity of the device structure and is conducive to improving the assembly efficiency of the fixed connection between the bottom bracket 11, the protective shell 12 and the slewing bearing seat 6.

[0035] Preferably, a circular concave outer ring positioning groove 61 is provided on the top end surface of the slewing bearing seat 6 , and a plurality of first fixing holes 62 are vertically penetrated through the outer ring positioning groove 61 .

[0036] Preferably, the slewing bearing 7 includes an annular outer ring 71 and an inner ring 72, as well as a plurality of rollers 73 distributed between the outer ring 71 and the inner ring 72. The outer ring 71 is horizontally seated on the top end surface of the slewing bearing seat 6 via an outer ring positioning groove 61. A plurality of second fixing holes 711 are vertically penetrated through the outer ring 71. The second fixing holes 711 correspond one-to-one with the first fixing holes 62, so that the outer ring 71 is coaxially fixed to the slewing bearing seat 6 via the second fixing holes 711 and the first fixing holes 62 via the second threaded fasteners 15.

[0037] Preferably, the bearing inner ring 72 is rotatably connected to the inner side of the bearing outer ring 71 and is offset in height relative to the bearing outer ring 71. The main body of the bearing inner ring 72 is preferably located relatively inside the slewing bearing seat 6 and is vertically penetrated by a plurality of third fixing holes 721, so that the third fixing holes 721 can be offset from the top end surface of the slewing bearing seat 6.

[0038] Preferably, a fixing ring 31 matching the size of the bearing inner ring 72 is coaxially welded and fixed on the bottom surface of the turntable 3, and a plurality of fourth fixing holes 32 are vertically penetrated on the turntable 3 and the fixing ring 31. The fourth fixing holes 32 correspond one-to-one with the third fixing holes 721. During installation, the turntable 3 is seated on the bearing inner ring 72 through the fixing ring 31, and the bearing inner ring 72 is coaxially fixed to the bearing inner ring 72 through the fourth fixing holes 32 and the third fixing holes 721 through the third threaded fastener 16, so that the turntable 3 can rotate with the bearing inner ring 72 compared with the bearing outer ring 71, the slewing bearing seat 6 and the bracket body 1.

[0039] The inner ring 72 of the bearing of the device of the present application is arranged with a vertical offset from the outer ring 71 of the bearing, and the main body part of the inner ring 72 of the bearing is offset from the top end face of the slewing bearing seat 6, so that the inner ring 72 of the bearing protrudes slightly from the outer ring 71 of the bearing. Together with the fixing ring 31 added to the bottom of the turntable 3, it can reserve enough installation clearance for the second threaded fastener 15 at the top of the outer ring 71 of the bearing and prevent the second threaded fastener 15 from interfering with the rotation of the turntable 3. At the same time, the bottom of the main body part of the inner ring 72 of the bearing is offset from the top end face of the slewing bearing seat 6, so as to prevent interference between the third threaded fastener 16 and the slewing bearing seat 6 after the turntable 3 is installed, ensuring that the inner ring 72 of the bearing and the turntable 3 can rotate smoothly relative to the slewing bearing seat 6 and the support body 1.

[0040] Please refer to Figure 3 , Figure 4 and Figure 7 , in a specific embodiment, the device of the present application further includes a coupling structure 8. The coupling structure 8 is coaxially fixedly connected between the power output end 22 of the hollow motor 2 and the turntable 3 to transmit the output torque of the hollow motor 2 to the turntable 3, so that the hollow motor 2 can drive the turntable 3 to rotate.

[0041] Preferably, the coupling structure 8 is generally in the shape of an approximate circular shallow dish. Its upper end has an outer edge 81 that can support and connect to the turntable 3, and a plurality of fifth fixing holes 82 are vertically penetrated through the outer edge 81. A channel opening 83 for communicating with the central channel 21 is provided at the center of the bottom end face of the coupling structure 8, and a plurality of sixth fixing holes 84 are distributed around the channel opening 83. Correspondingly, a plurality of seventh fixing holes 33 corresponding to the fifth fixing holes 82 one by one are vertically penetrated through the middle of the turntable 3, and a plurality of eighth fixing holes 23 corresponding to the sixth fixing holes 84 one by one are provided on the power output end 22 of the hollow motor 2. During installation, the bottom end face of the coupling structure 8 is seated on the power output end 22 of the hollow motor 2, and the coupling structure 8 is coaxially fixedly connected to the power output end 22 of the hollow motor 2 through the fourth threaded fastener 17 via the eighth fixing hole 23 and the sixth fixing hole 84. The middle of the turntable 3 is seated on the outer edge 81 of the coupling structure 8, and the turntable 3 is coaxially fixedly connected to the coupling structure 8 through the fifth threaded fastener 18 via the seventh fixing hole 33 and the fifth fixing hole 82.

[0042] The coupling structure 8 of the device in this application can fixedly connect the power output end 22 of the hollow motor 2 and the turntable 3 coaxially, so as to continuously and stably transmit the torque output by the hollow motor 2 to the turntable 3. The structure is simple and convenient for disassembly and assembly. Moreover, the coupling structure 8 of the device in this application is mainly used for transmitting torque, rather than bearing axial loads. The axial loads of the nuclear waste package 100 and the turntable 3 are mainly transmitted to the support body 1 through the slewing bearing 7 and the slewing bearing seat 6, so as to prevent the power output end 22 of the hollow motor 2 from bearing excessive axial loads through the coupling structure 8, ensure the stable and high-precision operation of the hollow motor 2, and enable the hollow motor 2 to output a greater torque to the turntable 3, thereby adapting to the radioactivity detection of nuclear waste packages 100 with greater weights.

[0043] Please refer to Figure 4 and Figure 7 , as a preference, the circular shallow dish-shaped structure of the coupling structure 8 in this application forms a probe cavity 85 in its middle space, which can communicate with the central channel 21 through the channel opening 83, and then the detection probe 5 is accommodated through the probe cavity 85. The probe cavity 85 of the coupling structure 8 in this application is located below the center of the bottom surface of the turntable 3, so that the detection probe 5 can be closest to and restricted to the nuclear waste package 100 at the positioning structure 4 to the greatest extent, which is beneficial to detection, ensures the detection accuracy, and ensures that the main components in the device in this application are completely aligned on the central axis 10 in a relatively small space, improving the overall structural compactness of the device in this application and reducing the overall floor area of the device.

[0044] Please refer to Figures 3 to 4 , in a specific embodiment, a maintenance opening 34 corresponding to the upper part of the probe cavity 85 is opened at the center of the turntable 3 in this application, and a cover plate 35 is detachably installed on the maintenance opening 34. The maintenance opening 34 is arranged corresponding to the probe cavity 85, so that the user can directly check and perform maintenance and disposal operations on the detection probe 5 arranged inside the device through the maintenance opening 34, which greatly facilitates the user's use and maintenance and disposal. In addition, closing the maintenance opening 34 with the cover plate 35 can prevent external objects from falling into the probe cavity 85 of the coupling structure 8, which is convenient for the user to disassemble and assemble.

[0045] Due to the differences in the types and phases of nuclear waste generated during the operation of nuclear power plants, the types and specifications of treatment containers vary. Currently, relatively common treatment containers include 160L, 200L, and 400L steel waste drums (not shown in the figure), as well as HIC containers that are larger in volume and size than the waste drums (not shown in the figure). Due to the characteristics of the polyethylene material of the HIC container, such as better anti-biodegradation stability, sealing performance, and chemical stability, the expected storage life is not less than 300 years. Therefore, it is more widely used than steel waste drums. It can be seen that there are significant differences in the types and specifications of the nuclear waste packages 100 in nuclear power plants. If the positioning structure 4 of the device adopts a single-size design, it may not be applicable to the radioactivity detection of different types and specifications of nuclear waste packages 100. If the positioning structure 4 is designed as a structure with self-adaptive size adjustment, such as the large-volume radioactive waste drum multi-functional multi-mode measurement device disclosed in the aforementioned Chinese Patent Publication No. CN117233819A, which adaptively positions and restricts different types and sizes of nuclear waste packages 100 through a relatively complex clamping mechanism. Although it improves the adaptability of the device to different nuclear waste packages 100, its structure is too complex, the cost is relatively high, and it is prone to failures.

[0046] Please refer to Figures 2 to 3 , in view of this, the positioning structure 4 of the device in this application includes an HIC centering member 41 that can be movably sleeved around the bottom periphery of the HIC container and a drum centering member 42 that can be movably sleeved around the bottom periphery of the waste drum. Among them, the HIC centering member 41 is detachably and coaxially fixedly connected to the turntable 3 to vertically limit the HIC container. The drum centering member 42 is detachably and coaxially fixedly connected to the turntable 3 and is relatively located in the middle of the HIC centering member 41 to vertically limit the waste drum.

[0047] The design of the positioning structure 4 of the device in this application enables the device in this application to not only position and restrict the more widely used and larger-sized HIC container through the HIC centering member 41, but also position and restrict the relatively less used waste drum through the drum centering member 42, ensuring that the device in this application is applicable to different nuclear waste packages 100. In addition, both the HIC centering member 41 and the drum centering member 42 of the device in this application are detachable structures. When actually detecting the nuclear waste package 100 formed by the HIC container, the drum centering member 42 can be disassembled to avoid interfering with the positioning and restriction of the HIC centering member 41 on the HIC container. Since the size of the waste drum is relatively smaller and the drum centering member 42 is relatively located inside the HIC centering member 41, when actually detecting the nuclear waste package 100 formed by the waste drum, it is not necessary to disassemble the HIC centering member 41, and it will not interfere with the positioning and restriction of the drum centering member 42 on the waste drum.

[0048] Since both the HIC centering member 41 and the drum centering member 42 are fixedly connected to the turntable 3 coaxially, after placement, the positioning structure 4 of the present application can straighten the HIC container and the waste drum and keep them vertically placed on the turntable 3, preventing the nuclear waste package 100 from tilting and toppling during the detection process.

[0049] Please refer to Figure 3 , preferably, the HIC centering member 41 of the device of the present application includes an HIC bracket 411 generally in a circular ring shape and HIC feet 412 fixedly connecting the HIC bracket 411 to the turntable 3. The HIC bracket 411 is preferably designed as an inwardly tapered funnel-shaped structure with a wider top and a narrower bottom. The inner diameter of its bottom matches the outer diameter of the bottom of the HIC container, playing a role in positioning and restricting the HIC container. The inner diameter of the top of the HIC bracket 411 is larger than the outer diameter of the bottom of the HIC container, so as to form a guiding effect for inserting the HIC container, facilitating the vertical insertion of the HIC container into the HIC centering member 41 and sitting on the turntable 3.

[0050] Please refer to Figure 3 , preferably, the drum centering member 42 of the device of the present application includes a drum-shaped bracket 421 and a plurality of drum feet 422 vertically fixedly connected between the inner wall and the bottom surface of the drum bracket 421. A bracket opening 423 for exposing the cover plate 35 and the inspection opening 34 is provided in the middle of the bottom surface of the drum bracket 421 to prevent the drum centering member 42 from interfering with the cover plate 35 and the inspection opening 34. The drum feet 422 are preferably in a plate shape and are vertically distributed evenly in the radial direction of the drum bracket 421 between the inner wall and the bottom surface of the drum bracket 421. The side of the drum feet 422 facing the central axis 10 is set as an inclined surface sloping downward, and it is ensured that the circular diameter formed by the bottom of the inclined surfaces of each drum foot 422 matches the outer diameter of the bottom of the waste drum, playing a role in positioning and restricting the waste drum. The circular diameter formed by the upper part of the inclined surfaces of each drum foot 422 is larger than the outer diameter of the bottom of the waste drum, so as to form a guiding effect for inserting the waste drum, facilitating the vertical insertion of the waste drum into the drum centering member 42 and sitting on the turntable 3.

[0051] In view of the differences in the volumes and sizes of the HIC container and the waste drum, the HIC centering member 41 and the drum centering member 42 can be designed in a variety of different sizes, and the corresponding HIC centering member 41 and drum centering member 42 can be replaced according to the actual size of the nuclear waste package 100.

[0052] Please refer to Figures 1 to 4, in a specific embodiment, the hollow motor 2 of the device of the present application is a servo motor. The device further includes a control module (not shown in the figure) and a weighing module 9. The control module can be arranged in a host computer (not shown in the figure) or in a PLC (not shown in the figure), and is electrically connected to the weighing module 9 and the hollow motor 2 respectively to control the rotation angle and speed of the turntable 3, and measure the weight of the nuclear waste package 100, and then calculate the radioactivity through a built-in algorithm.

[0053] Servo motors usually use optical encoders to monitor the actual position and speed of the rotor and provide feedback signals to the control module. The control module calculates and makes decisions based on the feedback information, and generates appropriate control signals to adjust the behavior of the servo motor, achieve precise position, speed, and torque control of the rotor, and thus can precisely control the rotation angle and speed of the turntable 3, driving the nuclear waste package 100 to rotate at a fixed angle to a suitable detection position to ensure the accuracy of the detection results.

[0054] Preferably, the weighing module 9 is arranged between the support body 1 and the support surface (generally referring to a flat ground) supporting the support body 1 and is electrically connected to the control module. Preferably, the weighing module 9 includes four weighing sensor feet, which are respectively vertically and fixedly connected to the four corners of the bottom bracket 11, forming the bottom support foot structure of the support body 1, so as to cause the weighing sensor feet to generate detection signals and send them to the control module when the support body 1 is under pressure, and then realize the detection of the mass of the nuclear waste package 100 through the internal algorithm of the control module, and comprehensively calculate the radioactivity of the nuclear waste package 100 according to the detection data of the detection probe 5.

[0055] The device of the present application preferably can be set with different rotation drive control modes. During actual use, the control module can be used to drive the hollow motor 2 to operate, control the turntable 3 to rotate continuously, step by step, or rotate a certain number of turns, and then drive the corresponding nuclear waste package 100 to rotate around the central axis 10 under the positioning and limiting action of the HIC centering member 41 or the barrel centering member 42 to facilitate the detection by the detection probe 5. The continuous rotation is carried out at an angular velocity of about 1 r / min. For step-by-step rotation, the angle of each step (greater than or equal to 2°) and the time of each step can be specified. For measurement, the angle step is set to 2°, and the measurement time and the time of each step can be selected by the user. The 2° angle step gives the best angular resolution for the dose rate value. From the operating characteristics, the main function of the device of the present application is to drive the hollow motor 2 to operate under the control of the control module, drive the turntable 3 and the positioning structure 4 to rotate through the coupling structure 8, and then drive the nuclear waste package 100 to rotate, so as to cooperate with the detection probe 5 and the weighing sensor feet to complete the radioactivity detection work.

[0056] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A device for detecting the radioactivity of nuclear waste packages, characterized in that, Comprising a support body (1) and the following provided on the support body (1): A hollow motor (2), the hollow motor (2) being vertically fixed on the support body (1) and having a central channel (21) passing through the central axis of the support body (1); A turntable (3), the turntable (3) being rotatably connected to the support body (1) and coaxially fixedly connected to the power output end (22) of the hollow motor (2) to rotate under the direct drive of the hollow motor (2); A positioning structure (4), the positioning structure (4) being fixed on the turntable (3) and coaxial with the turntable (3) and the hollow motor (2) to position and limit the nuclear waste package (100); A detection probe (5), the detection probe (5) extending through the central channel (21) to the bottom of the turntable (3) and corresponding to be below the positioning structure (4) to detect the radioactivity of the nuclear waste package (100).

2. The device for detecting the radioactivity of nuclear waste packages according to claim 1, characterized in that, The device further comprises: A slewing bearing seat (6), the slewing bearing seat (6) being fixed in the support body (1) and coaxially sleeved outside the hollow motor (2); A slewing bearing (7), the slewing bearing (7) being installed on the slewing bearing seat (6) and rotating relative to the slewing bearing seat (6); the turntable (3) is rotatably connected to the slewing bearing seat (6) through the slewing bearing (7).

3. The device for detecting radioactive activity of nuclear waste packages according to claim 2, characterized in that: The slewing bearing (7) comprises: An outer bearing ring (71), the outer bearing ring (71) being located on the top of the slewing bearing seat (6) and coaxially fixedly connected to the slewing bearing seat (6) through fasteners; An inner bearing ring (72), the inner bearing ring (72) being rotatably connected to the inside of the outer bearing ring (71) and being vertically offset from the outer bearing ring (71); The turntable (3) is located on the inner bearing ring (72) and coaxially fixedly connected to the inner bearing ring (72) through fasteners.

4. The device for detecting radioactive activity of nuclear waste packages according to claim 2, characterized in that: The slewing bearing (7) is a crossed roller bearing.

5. The device for detecting radioactive activity of nuclear waste packages according to claim 1, characterized in that: The device further comprises a coupling structure (8), the coupling structure (8) being coaxially fixedly connected between the power output end (22) of the hollow motor (2) and the turntable (3) to transmit the output torque of the hollow motor (2) to the turntable (3).

6. The device for detecting the radioactivity of nuclear waste packages according to claim 5, characterized in that, A probe cavity (85) communicating with the central channel (21) is provided in the middle of the coupling structure (8), and the detection probe (5) is located in the probe cavity (85).

7. The device for detecting the radioactivity of a nuclear waste package according to claim 6, wherein An inspection opening (34) corresponding to be above the probe cavity (85) is provided at the center of the turntable (3), and a cover plate (35) is detachably installed on the inspection opening (34).

8. The device for detecting the radioactivity of a nuclear waste package according to claim 1, wherein the nuclear waste package (100) comprises a HIC container and a waste bucket, characterized in that, The positioning structure (4) includes a HIC centering member (41) movably sleeved on the outer periphery of the bottom of the HIC container and a bucket centering member (42) movably sleeved on the outer periphery of the bottom of the waste bucket; the HIC centering member (41) is detachably and coaxially fixedly connected to the turntable (3) to vertically limit the HIC container; the bucket centering member (42) is detachably and coaxially fixedly connected to the turntable (3) and relatively located in the middle of the HIC centering member (41) to vertically limit the waste bucket.

9. The device for detecting the radioactivity of a nuclear waste package according to claim 1, characterized in that, The hollow motor (2) is a servo motor; the device further includes a control module electrically connected to the hollow motor (2) to control the rotation angle and speed of the turntable (3).

10. The device for detecting the radioactivity of nuclear waste packages according to claim 9, characterized in that, The device further includes a weighing module (9) disposed between the support body (1) and the support surface supporting the support body (1) and electrically connected to the control module to measure the weight of the nuclear waste package (100).

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