Separation pretreatment device for radioactive cesium in seawater

Abstract

The invention discloses a separation pretreatment device for radioactive cesium in seawater, and belongs to the technical field of seawater separation. Comprising a seawater separation cylinder, a filter cover used for filtering impurities is assembled at the top of the seawater separation cylinder, a modular enrichment and separation mechanism is arranged at the circle center position in the seawater separation cylinder, and the modular enrichment and separation mechanism is formed by upwards stacking and assembling a plurality of pre-assembled circular ring frames; a plurality of enrichment resin frames are adsorbed on each pre-assembled circular ring frame through magnetic attraction, so that a modular separation and enrichment column at the circle center end of the seawater separation barrel is formed, and through combination of a modular enrichment and separation mechanism and magnetic attraction, rapid and safe replacement of a radioactive cesium adsorption and separation end is achieved; the problems of complicated replacement and long downtime of an integral enrichment column in the prior art are effectively solved, when a certain resin frame is adsorbed and saturated, the resin frame can be independently disassembled and replaced without downtime or disassembly of the whole column body, the maintenance time is remarkably shortened, and the radioactive exposure risk of operators is remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of seawater separation technology, and more specifically, to a pretreatment device for separating radioactive cesium from seawater. Background Technology

[0002] Monitoring radioactive cesium in the marine environment is a crucial step in assessing marine ecological health and implementing environmental protection. Currently, the detection and analysis of radioactive cesium in seawater typically requires pretreatment of seawater samples using separation and enrichment devices to concentrate the target nuclide and eliminate matrix interference. The core of such devices lies in their separation and enrichment unit, which is filled with an adsorbent material highly selective for cesium ions. The entire unit includes a pumping system, pretreatment components, and a separation and enrichment column. The workflow involves pumping seawater through the enrichment column, causing cesium ions to be specifically retained by the adsorbent within the column, thus achieving effective separation from a large volume of seawater.

[0003] However, in practical applications, the adsorption resin in the enrichment column is a consumable with a limited adsorption capacity. Existing enrichment columns often adopt an integral design, with the column body and inlet / outlet pipelines rigidly connected by flanges. Some separation ends are even integrated with the support. This fixed connection mode makes the operation of replacing the failed adsorbent extremely cumbersome. It not only requires shutdown and disassembly of related pipelines, resulting in low efficiency and extended monitoring interruption time, but also easily exposes operators to radioactive risks and the possibility of cross-contamination when handling resin that has adsorbed radionuclides.

[0004] In some existing improved technologies, in order to reduce the number of downtimes, higher performance and durability adsorbents are used, or openable column end caps are installed. However, none of these have fundamentally changed the nature of inconvenient maintenance. This problem is particularly prominent for marine monitoring agencies that need to operate for a long time and at multiple locations. In the complex environment of ship-based platforms, disassembling and assembling an integral column that is rigidly connected to the pipeline not only requires a large operating space and special tools, but the process is also prone to radioactive leakage and cross-contamination. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a pretreatment device for separating radioactive cesium in seawater, which aims to solve the above-mentioned technical problems.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A pretreatment device for separating radioactive cesium in seawater includes a seawater separation cylinder. A filter cover for filtering impurities is assembled on the top of the seawater separation cylinder. A modular enrichment separation mechanism is arranged at the center of the inner part of the seawater separation cylinder. The modular enrichment separation mechanism is composed of several pre-assembled circular frames stacked upwards. Each pre-assembled circular frame has several enrichment resin frames magnetically adsorbed on it to form a modular separation enrichment column at the center end of the seawater separation cylinder. The outer surface of the seawater separation cylinder is provided with an external magnetic traction mechanism that can move up and down along the cylinder wall and rotate around the cylinder. The modular enrichment and separation mechanism is slidably provided with a self-retrieving and placing mechanism. The self-retrieving and placing mechanism is equipped with two sets of symmetrically arranged retrieval and placing modules, and each set of retrieval and placing modules is provided with a first servo telescopic rod for telescopically retrieving and replacing the enrichment resin frame. The external magnetic traction mechanism is magnetically connected to the self-retrieving and releasing mechanism. The self-retrieving and releasing mechanism is controlled to move around the modular enrichment and separation mechanism through the seawater separation cylinder. The failed enrichment resin frame is picked up by the first servo telescopic rod of the one-side pick-up and release module, and a new enrichment resin frame is inserted simultaneously on the other side to complete the self-maintenance work of the separation end.

[0008] As a further aspect of the present invention: the modular enrichment and separation mechanism includes a circular base fixedly connected to the center of the bottom of the seawater separation cylinder. A first insertable circular sleeve is fixedly connected to the upper surface of the circular base. A second insertable circular sleeve is also fixedly connected to both ends of the pre-assembled circular frame. The pre-assembled circular frame is assembled upwards sequentially by inserting the second insertable circular sleeve and the first insertable circular sleeve. Each pre-assembled circular frame has several fan-shaped slots circumferentially opened on its side. A first magnetic suction plate is fixedly installed on the side of each fan-shaped slot. The enrichment resin frame is also fan-shaped as a whole, and its outer surface is fitted with a fan-shaped inner frame. A second magnetic suction plate is fixedly installed on the side of each fan-shaped inner frame. The second magnetic suction plate is inserted into the fan-shaped slots one by one by adsorption and adhesion with the first magnetic suction plate.

[0009] As a further aspect of the present invention: the self-loading mechanism includes a second annular sleeve, which is slidably fitted onto the outside of an annular cylinder composed of several pre-assembled annular frames. A magnetically attached annular edge that is tightly sealed to the inner wall of the seawater separation cylinder is fixedly connected to the outer edge of the second annular sleeve. A symmetrical loading and unloading module is arranged on the bottom surface of the second annular sleeve, and a sealing module is arranged on the side of each loading and unloading module facing the pre-assembled annular frame. The loading and unloading module includes a T-shaped arc-shaped cavity, and the side of the T-shaped arc-shaped cavity facing the pre-assembled annular frame is open. A first servo telescopic rod is fixedly installed inside each of the T-shaped arc-shaped cavities, and the output end of the first servo telescopic rod moves telescopically toward the side of the pre-assembled annular frame.

[0010] As a further aspect of the present invention: the external magnetic traction mechanism includes a first servo motor connected to the bottom of the outer surface of the seawater separation cylinder. A threaded rod flush with the seawater separation cylinder is fixedly installed on the output end of the first servo motor. A first annular sleeve meshing with the threaded rod is fitted on the outer surface of the seawater separation cylinder. A concentric annular gear sleeve is movably installed on the first annular sleeve. A toothed opening is provided on the outer edge of the annular gear sleeve. An electrically controlled magnetic annular sleeve is fixedly installed on the upper surface of the annular gear sleeve. The magnetic end of the electrically controlled magnetic annular sleeve is attracted and corresponds to the magnetic annular sleeve edge through the seawater separation cylinder. A second servo motor is fixedly installed on the side of the first annular sleeve. A gear disc meshing with the outer toothed opening of the annular gear sleeve is fixedly installed on the output end of the second servo motor.

[0011] As a further aspect of the present invention: a base support cover is fixedly connected to the bottom of the seawater separation cylinder, and a drain pipe is fixedly installed on the side wall of the base support cover. The drain pipe is connected to the center of the bottom of the seawater separation cylinder and communicates with the interior of the annular base to drain the seawater that has completed adsorption and separation. A detection unit is fixedly installed on the upper surface of the electrically controlled magnetic annular sleeve. The detection end of the detection unit is in close contact with the outer surface of the seawater separation cylinder, and the outer surface of the seawater separation cylinder is visible and transparent. The interior of the annular base is also equipped with a turbine adsorption mechanism that can generate a vortex at the center of the seawater separation cylinder to drive the seawater to converge towards one end of the modular enrichment and separation mechanism for separation and adsorption.

[0012] As a further aspect of the present invention: the turbine adsorption mechanism includes a third servo motor fixedly installed at the center position inside the circular base. A cavity rod is fixedly installed on the output end of the third servo motor. Several turbine blades are fixedly connected from top to bottom on the outer surface of the cavity rod. A second servo telescopic rod is fixedly installed inside the cavity rod. The protruding end of the second servo telescopic rod faces the top of the cavity rod and extends out from the top of the cavity rod. A magnetic chuck is fixedly installed on the protruding end. An electrically controlled magnetic sleeve is movably installed on the magnetic chuck. The magnetic end of the electrically controlled magnetic sleeve is attached to the upper surface of the magnetic chuck. A water outlet is formed around the bottom of the circular base at the position outside the third servo motor.

[0013] As a further aspect of the present invention: the external of the electrically controlled magnetic sleeve is configured with an activation mechanism, the activation mechanism including a bent cavity rod, the extended end of which is movably mounted with a cavity rotating cylinder, the cavity rotating cylinder being flush with a circular cylinder composed of several pre-assembled circular ring frames, the interior of the cavity rotating cylinder being hollow, and an injection sleeve being fixedly installed inside the cavity, the output end of the injection sleeve being fixedly connected to a diverter cylinder, the diverter cylinder being connected in parallel with several drainage hoses, each drainage hose being attached to the inner wall of the cavity rotating cylinder and extending from the top of the side wall of the cavity rotating cylinder, the outer surface of the cavity rotating cylinder being fitted with a scraping sleeve, and the scraping sleeve connecting with the drainage hoses extending from the side wall of the cavity rotating cylinder.

[0014] As a further aspect of the present invention: the activation mechanism further includes an injection push rod inserted into the injection sleeve. An external convex plate is fixedly installed on the outward protruding end of the injection push rod. A return spring is fixedly installed on the external convex plate and is locked at the bottom of the cavity inside the hollow rotating cylinder. The return spring pulls the injection push rod to always extend outward, and the protruding end of the injection push rod passes through the bottom of the hollow rotating cylinder. A trigger extension rod is fixedly installed on the through end. A ball sleeve is fixedly installed on the trigger extension rod. A wavy ring base is fixedly installed on the upper surface of the second ring sleeve. The balls of the ball sleeve are always attached to the upper surface of the wavy ring base under the external pulling action of the return spring. A replenishment adsorption hose is also fixedly installed inside the bent cavity rod. One side of the replenishment adsorption hose is connected to the injection sleeve, and the other side passes through the bent cavity rod.

[0015] As a further aspect of the present invention: the pick-and-place module further includes an arc-shaped hollow frame fixedly installed on the output end of the first servo telescopic rod. The side wall of the arc-shaped hollow frame is provided with a magnetic coating. Pressure detection rods are fixedly installed on both sides of the inner side wall of the T-shaped arc cavity. An outward-folding bottom plate is hinged to the bottom of the T-shaped arc cavity. The bottom of the seawater separation cylinder is also provided with a disassembly plate to open the outward-folding bottom plate for outward folding.

[0016] As a further aspect of the present invention: the sealing module includes an arc-shaped frame, with limiting side frames fixedly connected to both the upper and lower sides of the arc-shaped frame. A spring winding drum is fixedly installed on one side of the arc-shaped frame, and an electrically controlled winding drum is fixedly installed on the other side. Two traction ropes housed in the limiting side frames are wound on the electrically controlled winding drum. A clamping plate is fixedly connected to the outer side of the traction ropes, and the clamping plate is slidably clamped into the limiting side frames. A sealing cloth cover is wound on the spring winding drum, and the protruding end of the sealing cloth cover is connected to the side wall of the clamping plate.

[0017] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects: This solution combines a modular enrichment and separation mechanism with magnetic adsorption to achieve rapid and safe replacement of the radioactive cesium adsorption and separation end. It effectively solves the problems of cumbersome replacement and long downtime of integral enrichment columns in existing technologies. It is assembled by stacking pre-assembled circular frames upwards, with a fan-shaped enrichment resin frame fixed on each frame by magnetic attraction, forming an expandable separation and enrichment column. When a resin frame is saturated, it can be disassembled and replaced individually without stopping the machine or disassembling the entire column. This significantly reduces maintenance time and the risk of radioactive exposure for operators. Compared with the traditional rigid connection mode, this design allows for local maintenance without stopping the machine, which is particularly suitable for long-term marine monitoring scenarios and improves the continuity and adaptability of the device.

[0018] The non-contact drive of the external magnetic traction mechanism and the self-loading mechanism enables the automated loading and unloading of the enriched resin frames, improving operational safety and accuracy. The external magnetic traction mechanism controls the movement of the self-loading mechanism through the seawater separation cylinder wall, causing it to rotate and move up and down around the enrichment column. The servo telescopic rod of the loading and unloading module synchronously completes the retrieval of failed frames and the insertion of new frames. The magnetic coupling method avoids damage to the internal seal of the cylinder, preventing radioactive leakage and cross-contamination. The detection unit monitors the adsorption status in real time to ensure proper operation. Attached Figure Description

[0019] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the seawater separation cylinder of the present invention in a half-sectional view; Figure 3 This is a schematic diagram of the overall structure of the turbine adsorption mechanism of the present invention; Figure 4 This is a schematic diagram of the modular enrichment and separation mechanism of the present invention in its disassembled state; Figure 5 This is a schematic diagram of the turbine adsorption mechanism of the present invention in a disassembled state; Figure 6 This is a schematic diagram of the external magnetic traction mechanism and self-loading mechanism of the present invention; Figure 7 This is a schematic diagram of the T-shaped arc-shaped cavity in a half-section view according to the present invention; Figure 8 This is a schematic diagram of the sealing module of the present invention; Figure 9 This is a cross-sectional structural diagram of the activation mechanism of the present invention.

[0021] Figure Labels 1. Seawater separator; 2. Filter cover; 3. Base support cover; 4. External magnetic traction mechanism; 41. First servo motor; 42. Threaded rod; 43. First circular ring sleeve; 44. Circular gear sleeve; 45. Second servo motor; 46. Electrically controlled magnetic circular ring sleeve; 47. Detection unit; 5. Modular enrichment and separation mechanism; 51. Circular base; 52. First insertable circular ring sleeve; 53. Pre-assembled circular frame; 54. Fan-shaped slot; 55. First magnetic suction plate; 56. Fan-shaped embedded frame; 57. Enriched resin frame; 58. Second magnetic suction plate; 59. Second insertable circular ring sleeve; 6. Self-loading and placing mechanism; 61. Second ring sleeve; 62. Magnetic ring edge; 63. Pick-up and drop-off module; 631. T-shaped arc cavity; 632. First servo telescopic rod; 633. Arc-shaped hollow frame; 634. Magnetic coating; 635. Pressure detection rod; 636. Outward-folding bottom plate; 64. Sealing module; 641. Arc-shaped edge frame; 642. Limiting side frame; 643. Spring winding drum; 644. Electrically controlled winding drum; 645. Traction rope; 646. Clamping plate; 647. Sealing cloth cover; 7. Turbine adsorption mechanism; 71. Third servo motor; 72. Cavity rod; 73. Turbine blade; 74. Second servo telescopic rod; 75. Magnetic chuck; 76. Electrically controlled magnetic sleeve; 77. Drain outlet; 8. Activation mechanism; 81. Bending cavity rod; 82. Cavity rotating cylinder; 83. Injection sleeve; 84. Diverter cylinder; 85. Drainage hose; 86. Scraping sleeve; 87. Injection push rod; 88. Outer convex plate; 89. Return spring; 810. Trigger extension rod; 811. Ball sleeve; 812. Liquid replenishment and adsorption hose; 813. Wavy ring base; 9. Drainage pipe.

[0022] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0023] The present invention provides a detailed description of a pretreatment apparatus for separating radioactive cesium in seawater, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; other alternative methods can be used by those skilled in the art for some well-known technologies. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the invention.

[0024] like Figures 1 to 9 As shown, this embodiment of the invention provides a pretreatment device for separating radioactive cesium in seawater, including a seawater separation cylinder 1. A filter cover 2 for filtering impurities is assembled on the top of the seawater separation cylinder 1. A modular enrichment separation mechanism 5 is arranged at the center of the interior of the seawater separation cylinder 1. The modular enrichment separation mechanism 5 is assembled by stacking several pre-assembled circular frames 53 upwards, and several enrichment resin frames 57 are magnetically adsorbed on each pre-assembled circular frame 53 to form a modular separation enrichment column at the center end of the seawater separation cylinder 1. The outer surface of the seawater separation cylinder 1 is provided with an external magnetic traction mechanism 4 that can move up and down along the cylinder wall and rotate around the cylinder. The modular enrichment and separation mechanism 5 is slidably provided with a self-retrieving and placing mechanism 6. The self-retrieving and placing mechanism 6 is equipped with two sets of symmetrically arranged picking and placing modules 63, and each set of picking and placing modules 63 is provided with a first servo telescopic rod 632 for telescopically picking up and replacing the enriched resin frame 57. The external magnetic traction mechanism 4 is magnetically connected to the self-retrieving mechanism 6. The self-retrieving mechanism 6 is controlled to move around the modular enrichment separation mechanism 5 through the seawater separation cylinder 1. The failed enrichment resin frame 57 is picked up by the first servo telescopic rod 632 of the one-side pick-up and put-down module 63, and a new enrichment resin frame 57 is inserted simultaneously on the other side to complete the self-maintenance work of the separation end.

[0025] To address the problem of difficult replacement of the adsorption separation end and safety risks caused by the integral design of the separation and enrichment unit in existing radioactive cesium monitoring devices, the above-mentioned technical solution is adopted. The technical solution mainly consists of a seawater separation cylinder 1, a filter cover 2, an external magnetic traction mechanism 4, a modular enrichment and separation mechanism 5, and a self-removing and placing mechanism 6. Through the modular design of the adsorption end and magnetic drive, the rapid and safe replacement of the adsorption separation end is achieved, improving the continuity and efficiency of separation.

[0026] The seawater separation cylinder 1, serving as the main container of the device, adopts a cylindrical structure with a high-strength, transparent glass wall for easy observation of its internal workings and convenient testing. A filter cover 2 is attached to its top via a snap-fit ​​mechanism. The filter cover 2 contains multiple layers of filter screens to remove large particles and flocculent matter as seawater flows in, preventing blockage of subsequent enrichment units. A base support cover 3 is fixedly connected to the bottom of the seawater separation cylinder 1, providing stable support and featuring a drain pipe 9 for discharging treated seawater. These are conventional structures in existing technology, primarily serving as basic containment and pretreatment to ensure smooth seawater flow and a stable separation environment. The modular enrichment and separation mechanism 5, the core of the adsorption separation end, is fixedly installed at the center of the seawater separation cylinder 1. It includes a circular base 51, with a first insert ring sleeve 52 fixedly connected to its upper surface. A pre-assembled circular frame 53 engages with the first insert ring sleeve 52 via second insert ring sleeves 59 on both sides, and is stacked upwards to form an expandable columnar structure. Each pre-assembled circular frame 53 has several fan-shaped slots 54 circumferentially formed on its circular edge. A first magnetic suction plate 55 is fixedly installed on the side of each fan-shaped slot 54. The configured enrichment resin frame 57 is fan-shaped as a whole, and its outer surface is fitted with a fan-shaped inner frame 56. A second magnetic suction plate 58 is fixedly installed on the side of each fan-shaped inner frame 56. Through the magnetic attraction between the second magnetic suction plate 58 and the first magnetic suction plate 55, the enrichment resin frames 57 can be inserted into the fan-shaped slots 54 one by one and fixed. This allows the structure formed by the enrichment resin frame 57 and the fan-shaped inner frame 56 to be both an independent and detachable module, allowing for individual replacement of a resin frame when it becomes saturated without disassembling the entire enrichment column, and also ensuring that the enrichment resin frame 57 in the fan-shaped inner frame 56 can be individually removed for cleaning, maintenance, or refilling with adsorption resin particles. This reduces maintenance time at the adsorption separation end and the risk of radioactive exposure. The height of the enrichment column can be flexibly adjusted according to the seawater treatment volume, enhancing the adaptability of the device. The configured external magnetic traction mechanism 4 is located on the outer surface of the seawater separation cylinder 1. During operation, it drives the internal self-loading mechanism 6. When working, the external magnetic traction mechanism 4 can move up and down and rotate around the outer surface of the seawater separation cylinder 1. The self-loading mechanism 6 is slidably sleeved on the outside of the modular enrichment separation mechanism 5 and is tightly sealed against the inner wall of the seawater separation cylinder 1. When the external magnetic traction mechanism 4 drives the self-loading mechanism 6 to move to the target position, the first servo telescopic rod 632 of one side of the loading module 63 extends and picks up the failed enrichment resin frame 57 through its end. Then, the first servo telescopic rod 632 of the other side of the loading module 63 synchronously inserts a new enrichment resin frame 57, realizing synchronous replacement of one loading and one loading.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 ,Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the modular enrichment and separation mechanism 5 includes a circular base 51 fixedly connected to the center of the bottom of the seawater separation cylinder 1. A first insertion circular sleeve 52 is fixedly connected to the upper surface of the circular base 51. A second insertion circular sleeve 59 is also fixedly connected to both ends of the pre-assembled circular frame 53. The pre-assembled circular frame 53 is assembled upwards sequentially by the insertion and engagement of the second insertion circular sleeve 59 with the first insertion circular sleeve 52. Each pre-assembled circular frame 53 has several fan-shaped slots 54 circumferentially opened on its side. A first magnetic suction plate 55 is fixedly installed on the side of each fan-shaped slot 54. The enrichment resin frame 57 is also fan-shaped as a whole, and a fan-shaped inner frame 56 is fitted on its outer surface. A second magnetic suction plate 58 is fixedly installed on the side of each fan-shaped inner frame 56. The second magnetic suction plate 58 is inserted into the fan-shaped slot 54 by adsorption and adhesion between the first magnetic suction plate 55 and the second magnetic suction plate 58.

[0028] The circular base 51 is fixedly connected to the bottom center of the seawater separation cylinder 1, serving as the supporting foundation for the modular enrichment and separation mechanism 5. Its annular structure ensures the uniformity of seawater flow. The first insertion ring sleeve 52 is a ring component with an internal threaded groove, used to insert and engage with the second insertion ring sleeve 59 of the pre-assembled ring frame 53. The second insertion ring sleeve 59 is fixedly connected to both ends of the pre-assembled ring frame 53. Through the insertion of the second insertion ring sleeve 59 and the first insertion ring sleeve 52, the pre-assembled ring frame 53 can be stacked upwards to form an expandable columnar structure. The height of the enrichment column can be flexibly adjusted according to the seawater processing capacity, enhancing the adaptability of the device. Furthermore, the insertion interface uses sealing material to prevent leakage, ensuring the stability of the separation process. The first magnetic suction plate 55 uses permanent magnet material to provide adsorption force. The pre-assembled circular frame 53 achieves rapid assembly through the interlocking circular sleeve, while the design of the fan-shaped slot 54 and magnetic plate ensures precise positioning and secure fixation of the enrichment resin frame 57. This not only facilitates the replacement of failed adsorbents but also allows for localized maintenance without shutting down the system, making it particularly suitable for long-term marine monitoring scenarios. Furthermore, the circumferential distribution of the fan-shaped slot 54 optimizes the seawater flow path, allowing radioactive cesium ions to contact the adsorbent material more evenly, improving separation efficiency. The separable design of the enrichment resin frame 57 and the fan-shaped embedded frame 56 further expands functionality; the fan-shaped embedded frame 56 can be disassembled separately for cleaning or refilling of the adsorbent resin, reducing material waste and the risk of cross-contamination.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 ,Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the self-loading mechanism 6 includes a second annular sleeve 61, which is slidably fitted onto the outside of an annular cylinder composed of several pre-assembled annular frames 53. A magnetically attached annular edge 62, which is sealed tightly against the inner wall of the seawater separation cylinder 1, is fixedly connected to the outer edge of the second annular sleeve 61. A symmetrical loading and unloading module 63 is arranged on the bottom surface of the second annular sleeve 61, and a sealing module 64 is arranged on the side of each loading and unloading module 63 facing the pre-assembled annular frame 53. The loading and unloading module 63 includes a T-shaped arc-shaped cavity 631, and the side of the T-shaped arc-shaped cavity 631 facing the pre-assembled annular frame 53 is open. A first servo telescopic rod 632 is fixedly installed inside the T-shaped arc-shaped cavity 631, and the output end of the first servo telescopic rod 632 moves telescopically toward the side of the pre-assembled annular frame 53.

[0030] The self-loading mechanism 6, driven by the external magnetic traction mechanism 4, moves around the modular enrichment and separation mechanism 5 and works in conjunction with the loading and unloading module 63 to synchronously pick up and insert the enrichment resin frame 57, thus achieving a self-maintenance function at the separation end. It mainly includes a second annular sleeve 61, a magnetic annular edge 62, a loading and unloading module 63, and a sealing module 64. The second annular sleeve 61 of the self-loading mechanism 6 slides entirely around the outside of an annular cylinder composed of several pre-assembled annular frames 53. Its outer edge is fixedly connected to a magnetic annular edge 62, which is tightly fitted to the inner wall of the seawater separation cylinder 1 using flexible rubber sealing material to prevent seawater leakage and reduce frictional resistance. Two sets of symmetrically arranged loading and unloading modules 63 are configured on the bottom surface of the second annular sleeve 61. Each loading and unloading module 63 has a sealing module 64 on the side facing the pre-assembled annular frame 53, used to seal the loading and unloading opening during non-operational periods to prevent seawater interference. The T-shaped arc cavity 631 is open on one side facing the pre-assembled circular frame 53. The output end of the first servo telescopic rod 632 inside moves telescopically toward the pre-assembled circular frame 53, and the end is used to adsorb and grasp the enriched resin frame 57. It is a telescopic rod structure that can perform servo telescopic movement in the prior art.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9As shown, the external magnetic traction mechanism 4 includes a first servo motor 41 connected to the bottom of the outer surface of the seawater separation cylinder 1. A threaded rod 42 flush with the seawater separation cylinder 1 is fixedly installed on the output end of the first servo motor 41. A first annular sleeve 43 meshing with the threaded rod 42 is fitted on the outer surface of the seawater separation cylinder 1. A concentric annular gear sleeve 44 is movably installed on the first annular sleeve 43. The outer edge of the annular gear sleeve 44 has teeth. An electrically controlled magnetic annular sleeve 46 is fixedly installed on the upper surface of the annular gear sleeve 44. The magnetic end of the electrically controlled magnetic annular sleeve 46 is attracted and corresponds to the magnetic annular edge 62 across the seawater separation cylinder 1. A second servo motor 45 is fixedly installed on the side of the first annular sleeve 43. A gear disc meshing with the outer teeth of the annular gear sleeve 44 is fixedly installed on the output end of the second servo motor 45.

[0032] The external magnetic traction mechanism 4 is used to drive the self-loading mechanism 6. It controls the up-and-down movement and rotation of the self-loading mechanism 6 through magnetic coupling across the wall of the seawater separation cylinder 1, thereby completing the automatic replacement of the enriched resin frame 57. The system includes a first servo motor 41, a threaded rod 42, a first circular ring sleeve 43, a circular gear sleeve 44, an electrically controlled magnetic circular ring sleeve 46, and a second servo motor 45 to achieve non-contact drive, ensuring the device's sealing and operational safety. The first servo motor 41 is fixedly installed at the bottom of the outer wall of the seawater separation cylinder 1. An integrated external convex ring is provided at the bottom of the outer wall of the seawater separation cylinder 1 for assembling and fixing the first servo motor 41. The output end of the first servo motor 41 is connected to a threaded rod 42 flush with the wall of the seawater separation cylinder 1. The threaded rod 42 engages with the first circular ring sleeve 43 fitted on the outer wall of the seawater separation cylinder 1 via threads. When the first servo motor 41 rotates, it drives the first circular ring sleeve 43 to move up and down along the cylinder wall. A concentric circular gear sleeve 44 is movably mounted on the first circular sleeve 43. The outer edge of the circular gear sleeve 44 has teeth. A second servo motor 45 is fixed to the side of the first circular sleeve 43, and its output end is equipped with a gear plate that meshes with the teeth of the circular gear sleeve 44. By controlling the forward and reverse rotation of the second servo motor 45, the circular gear sleeve 44 can be driven to rotate around the axis of the seawater separation cylinder 1. An electrically controlled magnetically attracted circular sleeve 46 is fixedly mounted on the upper surface of the circular gear sleeve 44. The electrically controlled magnetically attracted circular sleeve 46 uses an electromagnet and a permanent magnet array. Its magnetic end faces the wall of the seawater separation cylinder 1 and corresponds to the magnetically attracted circular ring edge 62 of the internal self-loading mechanism 6. When the electrically controlled magnetically attracted circular sleeve 46 is energized, it generates a strong magnetic field that penetrates the transparent wall of the seawater separation cylinder 1 and attracts the magnetically attracted circular ring edge 62, thereby transmitting the external motion to the internal self-loading mechanism 6.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 ,Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, a base support cover 3 is fixedly connected to the bottom of the seawater separation cylinder 1. A drain pipe 9 is fixedly installed on the side wall of the base support cover 3. The drain pipe 9 is connected to the center of the bottom of the seawater separation cylinder 1 and is connected to the inside of the annular base 51 to drain the seawater that has completed adsorption and separation. A detection unit 47 is fixedly installed on the upper surface of the electrically controlled magnetic annular sleeve 46. The detection end of the detection unit 47 is in close contact with the outer surface of the seawater separation cylinder 1, and the outer surface of the seawater separation cylinder 1 is visible and transparent. The inside of the annular base 51 is also equipped with a turbine adsorption mechanism 7 that can generate a vortex at the center of the seawater separation cylinder 1 to drive the seawater to converge towards one end of the modular enrichment and separation mechanism 5 for separation and adsorption.

[0034] The detection unit 47 is fixed to the upper surface of the electrically controlled magnetic ring sleeve 46, with its detection end in close contact with the outer wall of the seawater separation cylinder 1. It monitors the position of the magnetic ring edge 62 in real time using an optical encoder and a Hall effect sensor (as used in existing technology), feeding the data back to the control system to achieve closed-loop control and ensure movement accuracy within the millimeter range. Furthermore, to ensure the stability of the detection end, an optical sensing module is integrated inside the detection unit 47. This module monitors the color change or optical property alteration of the adsorbent in the enriched resin frame 57 due to cesium ion loading using light signals transmitted through the cylinder wall, directly and quantitatively monitoring the radioactivity around the resin frame. This is a conventional module for detecting cesium ion loading in existing technology.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the turbine adsorption mechanism 7 includes a third servo motor 71 fixedly installed at the center of the inner ring base 51. A cavity rod 72 is fixedly installed on the output end of the third servo motor 71. Several turbine blades 73 are fixedly connected from top to bottom on the outer surface of the cavity rod 72. A second servo telescopic rod 74 is fixedly installed inside the cavity rod 72. The protruding end of the second servo telescopic rod 74 faces the top of the cavity rod 72 and extends out from the top of the cavity rod 72. A magnetic chuck 75 is fixedly installed on the protruding end. An electrically controlled magnetic sleeve 76 is movably installed on the magnetic chuck 75. The magnetic end of the electrically controlled magnetic sleeve 76 is attached to the upper surface of the magnetic chuck 75. A water outlet 77 is opened around the bottom of the ring base 51 at the position outside the third servo motor 71.

[0036] The turbine adsorption mechanism 7 is a power component that drives the seawater flow and optimizes the separation efficiency. It generates a centripetal vortex to encourage the seawater to actively converge to the modular enrichment and separation mechanism 5, thereby improving the adsorption and separation effect of radioactive cesium. The third servo motor 71 is fixed at the center of the inner ring base 51, and its output end is connected to the cavity rod 72. Several sets of turbine blades 73 are fixedly installed on the outer surface of the cavity rod 72 from top to bottom. The turbine blades 73 adopt a twisted airfoil design, and their inclination angle and curvature are optimized by fluid dynamics. They can generate high-intensity vortices with low energy consumption and avoid the formation of flow dead zones. When the third servo motor 71 is started, it drives the cavity rod 72 and turbine blades 73 to rotate at high speed, forming a strong centripetal vortex in the central area of ​​the seawater separation cylinder 1. This vortex has a combined tangential and radial velocity, which can continuously push the seawater in the periphery of the cylinder towards the modular enrichment and separation mechanism 5 in the center, so that the seawater can fully pass through the fan-shaped slots 54 of each pre-assembled ring frame 53, ensuring that the radioactive cesium ions have a large-area contact with the adsorbent in the enrichment resin frame 57. During the vortex adsorption process, after the seawater completes the adsorption of cesium ions at the modular enrichment and separation mechanism 5, it converges downward into the inner part of the ring base 51 under the action of fluid pressure. A ring of water outlets 77 is provided around the bottom of the annular base 51, surrounding the outer side of the third servo motor 71. The adsorbed seawater flows into the lower cavity of the annular base 51 through these water outlets 77. The lower cavity of the annular base 51 is connected to the drain pipe 9, which is fixed to the side wall of the base support cover 3 and extends to the outside, forming a complete drainage path.

[0037] In actual operation, by adjusting the speed of the third servo motor 71, the balance between the eddy current intensity and the drainage flow rate can be controlled, ensuring sufficient residence time in the adsorption process while maintaining continuous water output and preventing the liquid level inside the cylinder from becoming too high. The cavity rod 72 of the turbine adsorption mechanism 7 also houses a second servo telescopic rod 74, with its extended end facing the top of the cavity rod 72 and a magnetic chuck 75 fixed to its end. An electrically controlled magnetic sleeve 76 is magnetically attached to the upper surface of the magnetic chuck 75. By electrically controlling the magnetic end of the sleeve 76, the connection state between it and the magnetic chuck 75 can be changed.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9As shown, the external of the electrically controlled magnetic sleeve 76 is equipped with an activation mechanism 8. The activation mechanism 8 includes a bent cavity rod 81. A cavity rotating cylinder 82 is movably installed at the extended end of the bent cavity rod 81. The cavity rotating cylinder 82 is flush with a circular cylinder composed of several pre-assembled circular ring frames 53. The interior of the cavity rotating cylinder 82 is hollow, and an injection sleeve 83 is fixedly installed inside the cavity. A diverter cylinder 84 is fixedly connected to the output end of the injection sleeve 83. Several drainage hoses 85 are connected in parallel to the diverter cylinder 84. Each drainage hose 85 is attached to the inner wall of the cavity rotating cylinder 82 and extends from the top of the side wall of the cavity rotating cylinder 82. A scraping sleeve 86 is fitted on the outer surface of the cavity rotating cylinder 82, and the scraping sleeve 86 connects with the drainage hoses 85 extending from the side wall of the cavity rotating cylinder 82.

[0039] The activation mechanism 8 includes a bent cavity rod 81, the extended end of which is movably mounted with a cavity rotating cylinder 82 via a bearing structure. The cavity rotating cylinder 82 is coaxial and flush with the enrichment column formed by the pre-assembled circular frame 53. A scraping sleeve 86 is fitted on the outer surface of the cavity rotating cylinder 82. The scraping sleeve 86 is made of flexible wear-resistant material and corresponds to the outlet position of the drainage hose 85. The activation mechanism 8 and the turbine adsorption mechanism 7 are integrated through a magnetic connection. The electrically controlled magnetic sleeve 76 is fitted onto the upper surface of the magnetic chuck 75. By controlling the energization of its magnetic end, the adsorption force with the magnetic chuck 75 can be adjusted. When activation is required, the second servo telescopic rod 74 retracts and pulls down, controlling the electrically controlled magnetic sleeve 76 to make tight contact with the magnetic chuck 75. At this time, the electrically controlled magnetic sleeve 76 is energized to generate a strong magnetic field, forming a firm magnetic connection with the magnetic chuck 75, thus making the bent cavity rod 81 and the cavity rod 72 form a rigid integrated structure. In this state, when the third servo motor 71 drives the turbine blades 73 to rotate, it will synchronously drive the cavity rotating cylinder 82 to rotate around the axis of the enrichment column. In the adsorption linkage working state, the activation mechanism 8 performs reagent coating and surface cleaning. The scraping sleeve 86 evenly coats the reagent on the outer surface of the enrichment column composed of the modular enrichment and separation mechanism 5, while its scraping action removes the adhering contaminants. When the activation function is not required, the second servo telescopic rod 74 extends upward and the magnetic end is de-energized and demagnetized by the electrically controlled magnetic sleeve 76, and the magnetic connection with the magnetic chuck 75 is switched to an active connection state. At this time, the turbine adsorption mechanism 7 works independently to generate eddy currents, while the activation mechanism 8 extends upward and remains stationary, avoiding unnecessary energy consumption and wear.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9As shown, the activation mechanism 8 also includes an injection push rod 87 inserted into the injection sleeve 83. An external convex plate 88 is fixedly installed on the outward protruding end of the injection push rod 87. A reset spring 89, which is locked at the bottom of the cavity inside the cavity rotating cylinder 82, is fixedly installed on the external convex plate 88. The reset spring 89 pulls the injection push rod 87 to always extend outward, and the protruding end of the injection push rod 87 passes through the bottom of the cavity rotating cylinder 82. A trigger extension rod 810 is fixedly installed on the end that passes through. A ball sleeve 811 is fixedly installed on the trigger extension rod 810. A wavy ring base 813 is fixedly installed on the upper surface of the second ring sleeve 61. The balls of the ball sleeve 811 are always attached to the upper surface of the wavy ring base 813 under the external pulling action of the reset spring 89. A replenishment adsorption hose 812 is also fixedly installed inside the bent cavity rod 81. One side of the replenishment adsorption hose 812 is connected to the injection sleeve 83, and the other side passes through the bent cavity rod 81.

[0041] The injection push rod 87 is inserted into the injection sleeve 83 to form a piston engagement. An external convex plate 88 is fixedly installed on its protruding end. A return spring 89 is fixedly installed on the external convex plate 88 through a snap-fit ​​structure. The other end of the return spring 89 is stuck at the bottom of the cavity inside the hollow rotating cylinder 82. Under the continuous pulling force of the return spring 89, the injection push rod 87 is pulled outward constantly, maintaining the tendency to extend outward. The protruding end of the injection plunger 87 extends through the bottom of the cavity rotating cylinder 82, and a trigger extension rod 810 is fixedly installed at the end. A ball sleeve 811 is installed at the end of the trigger extension rod 810, which contains precision balls that can roll freely. A wave-shaped ring base 813 is fixedly installed on the upper surface of the second ring sleeve 61. The upper surface of the base is machined with a continuous wave-shaped curved surface profile. During the operation of the activation mechanism 8, when the turbine adsorption mechanism 7 drives the cavity rotating cylinder 82 to rotate around the modular enrichment and separation mechanism 5, the fixed wave-shaped ring base 813 and the rotating ball sleeve 811 generate relative motion. Under the constant tension of the return spring 89, the balls in the ball sleeve 811 always roll close to the wave-shaped curved surface of the wave-shaped ring base 813. As the rotation proceeds, the ball bearings roll alternately along the crests and troughs of the wavy surface, driving the trigger extension rod 810 and the injection push rod 87 to perform periodic up-and-down reciprocating motions. When the ball bearings roll to the trough position, the return spring 89 pulls the injection push rod 87 outward, generating negative pressure inside the injection sleeve 83, drawing in reagent through the replenishment adsorption tubing 812. When the ball bearings roll to the crest position, the injection push rod 87 is pushed inward and compressed, distributing a fixed amount of reagent through the distribution cylinder 84 to each drainage tubing 85, achieving intermittent, pulsed reagent extrusion. The reagent output can be controlled by adjusting the speed of the third servo motor 71. The distribution cylinder 84 evenly distributes the reagent to multiple drainage tubing 85, ensuring that each drainage tubing 85 receives an equal amount of reagent, thereby achieving uniform coverage of the enrichment column surface under the rotational coating of the scraping sleeve 86. In actual operation, the extension length adjustment of the second servo telescopic rod 74 provides a working state switching function for this system. When it is necessary to pause reagent extrusion, by controlling the second servo telescopic rod 74 to extend outward, the electrically controlled magnetic suction sleeve 76 and the connected entire activation mechanism 8 are pushed upward, causing the ball sleeve 811 to disengage from the corrugated annular base 813. In this state, the injection push rod 87 remains stationary and no longer performs reciprocating motion, and the reagent supply is interrupted. When it is necessary to reactivate, the second servo telescopic rod 74 retracts and pulls down, causing the ball sleeve 811 to re-engage with the corrugated annular base 813, and the system resumes periodic operation, realizing instant start-stop control of reagent coating and avoiding unnecessary reagent waste. One end of the configured replenishment adsorption hose 812 is connected to the replenishment port of the injection sleeve 83, and the other end passes through the bent hollow rod 81 to connect to the external replenishment device, and is equipped with a one-way valve to ensure that only reagent can be drawn in.

[0042] like Figure 1 ,Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the pick-and-place module 63 also includes an arc-shaped hollow frame 633 fixedly installed on the output end of the first servo telescopic rod 632. The side wall of the arc-shaped hollow frame 633 is provided with a magnetic coating 634. Pressure detection rods 635 are fixedly installed on the side walls of both sides inside the T-shaped arc cavity 631. The bottom of the T-shaped arc cavity 631 is hinged with an outward-folding bottom plate 636. The bottom of the seawater separation cylinder 1 is also provided with a disassembly plate to open the outward-folding bottom plate 636 for outward folding.

[0043] The pressure detection rod 635 is a detection component used to pick up the resin enrichment frame 57. It monitors the changes in contact pressure inside the T-shaped arc-shaped cavity 631 in real time to ensure the operational accuracy and reliability of the self-pickup and drop-off mechanism 6 during the picking up and replacing of the resin enrichment frame 57. The pressure detection rod 635 is fixedly installed on the side walls of both sides inside the T-shaped arc-shaped cavity 631, arranged symmetrically, and works in conjunction with the first servo telescopic rod 632 and the arc-shaped hollow frame 633. The pressure detection rod 635 is a high-precision piezoresistive sensor used in the prior art. Its detection end faces the opening side of the T-shaped arc cavity 631 and is used to directly sense the contact pressure generated when the enriched resin frame 57 is inserted or removed. When the first servo telescopic rod 632 extends and drives the arc-shaped hollow frame 633 to move towards the fan-shaped slot 54 of the pre-assembled circular frame 53, the enriched resin frame 57 gradually separates from the T-shaped arc cavity 631. At this time, the side wall of the fan-shaped inner frame 56 of the enriched resin frame 57 gradually separates from the detection end of the pressure detection rod 635, so that the device can determine that the conveying operation is completed and then stop the extension movement of the first servo telescopic rod 632. Similarly, when the first servo telescopic rod 632 retracts, the enriched resin frame 57 gradually enters the T-shaped arc cavity 631. At this time, the side wall of the fan-shaped inner frame 56 of the enriched resin frame 57 gradually contacts the detection end of the pressure detection rod 635 until it is in place. The configured outward-folding bottom plate 636 is used to fold downwards and outwards, in conjunction with the disassembly plate at the bottom of the seawater separation cylinder 1 for quick maintenance of its pick-and-place module 63.

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9As shown, the sealing module 64 includes an arc-shaped frame 641. Limiting side frames 642 are fixedly connected to the upper and lower sides of the arc-shaped frame 641. A spring winding drum 643 is fixedly installed on one side of the arc-shaped frame 641, and an electrically controlled winding drum 644 is fixedly installed on the other side. Two traction ropes 645, which are stored in the limiting side frames 642, are wound on the electrically controlled winding drum 644. A clamping plate 646 is fixedly connected to the outer side of the traction ropes 645. The clamping plate 646 is slidably clamped in the limiting side frame 642. A sealing cloth cover 647 is wound on the spring winding drum 643. The protruding end of the sealing cloth cover 647 is connected to the side wall of the clamping plate 646.

[0045] The sealing module 64 is a key component for sealing and isolating the self-loading mechanism 6 during the retrieval and replacement of the enriched resin frame 57. It prevents seawater leakage and ensures the sealing and safety of the operating environment through the unfolding and rewinding of the flexible sealing cover 647. The sealing module 64 includes an arc-shaped side frame 641 made of lightweight alloy. Its arc curvature matches the inner wall of the seawater separation cylinder 1, ensuring a tight fit. Limiting side frames 642 are bolted to the upper and lower sides of the arc-shaped side frame 641. The limiting side frames 642 have internal grooves to guide the arc-shaped movement of the clamping plate 646. A spring-loaded winding drum 643 is fixedly installed on one side of the arc-shaped side frame 641, integrating a torsion spring to provide continuous winding force. An electrically controlled winding drum 644, driven by a micro servo motor, is fixedly installed on the other side to control the winding and unwinding speed. Two high-strength traction ropes 645 are wound on the electrically controlled winding drum 644. The traction ropes 645 are made of corrosion-resistant fiber material and are housed in the groove of the limiting side frame 642 to avoid interference with external components. A retaining plate 646 is fixedly connected to the outer end of the traction rope 645. The retaining plate 646 adopts a sliding fit design, and its edge is embedded in the groove of the limiting side frame 642 to ensure that it can only move horizontally along the frame direction. A sealing cloth cover 647 is wound on the spring winding drum 643. The cloth cover is made of multi-layer composite flexible material and has corrosion resistance and tear resistance. Its protruding end is connected to the side wall of the retaining plate 646 by buckle or sewing.

[0046] In the sealed operating state, the electrically controlled take-up drum 644 receives a command and starts. The servo motor rotates forward to wind up the traction rope 645, pulling the clamping plate 646 along the groove of the limiting side frame 642 towards the electrically controlled take-up drum 644. The movement of the clamping plate 646 synchronously pulls the sealing cloth cover 647 out of the spring take-up drum 643. The sealing cloth cover 647 gradually covers the opening area of ​​the arc-shaped side frame 641, forming a flexible sealing barrier. During the unfolding process, the edge of the sealing cloth cover 647 is pressed against the inner wall of the seawater separation cylinder 1 or adjacent components, relying on the material's elasticity to adapt to irregular surfaces and ensure the integrity of the seal. When the operation is complete and the seal needs to be released, the electrically controlled take-up drum 644 reverses to release the traction rope 645. Under the action of the torsion spring, the spring take-up drum 643 automatically rewinds the sealing cloth cover 647, causing the clamping plate 646 to slide back to its initial position. The sealing cloth cover 647 is quickly retracted, restoring unobstructed passage.

[0047] The usage method provided by this invention is as follows: In use, this invention firstly, based on the real-time monitoring of the adsorption state of radioactive cesium inside the seawater separation cylinder 1 by the detection unit 47, the control device initiates the separation pretreatment process. The detection unit 47 is fixed to the upper surface of the electrically controlled magnetic ring sleeve 46, with its detection end in close contact with the outer wall of the seawater separation cylinder 1. The optical sensor module scans the changes in optical properties of the enrichment resin frame 57 of the modular enrichment separation mechanism 5 due to the adsorption of cesium ions, quantitatively assessing the adsorption saturation. When the monitoring data shows that the adsorption capacity of the enrichment resin frame 57 is close to the threshold, the turbine adsorption mechanism 7 operates. The third servo motor 71 of the turbine adsorption mechanism 7 is activated, driving the cavity rod 72 and the turbine blades 73 fixed to its outer surface to rotate at high speed, generating a strong centripetal vortex in the central region of the seawater separation cylinder 1. The vortex, with its combined tangential and radial flow velocities, continuously propels seawater from the periphery of the cylinder towards the modular enrichment and separation mechanism 5 at the center. This ensures the seawater passes fully through the fan-shaped slots 54 of the pre-assembled annular frame 53, guaranteeing large-area contact between radioactive cesium ions and the adsorbent in the enrichment resin frame 57. During this process, seawater flows in from the top filter hood 2, passes through multiple layers of filter screens to remove large particles, and is then evenly distributed within the cylinder. Simultaneously, the water outlet 77 at the bottom of the annular base 51 connects to the drain pipe 9, allowing the adsorbed seawater to converge downwards and be discharged under fluid pressure, maintaining liquid level balance within the cylinder.

[0048] Then, during the eddy current adsorption process, the enrichment resin frame 57 of the modular enrichment and separation mechanism 5 is fixed by the magnetic adsorption of the second magnetic suction plate 58 on the side of its fan-shaped embedded frame 56 and the first magnetic suction plate 55 on the side of the fan-shaped slot 54 of the pre-assembled circular frame 53, forming a stable separation and enrichment column. Radioactive cesium ions in seawater are specifically trapped in the adsorbent of the enrichment resin frame 57, completing the initial enrichment. The detection unit 47 monitors the adsorption load of each pre-assembled circular frame 53 layer in real time. When the enrichment resin frame 57 at a specific fan-shaped slot 54 reaches saturation, the system records its position coordinates and prepares to trigger the self-maintenance program. The external magnetic traction mechanism 4 is in standby mode. Its first servo motor 41 engages with the first circular sleeve 43 through the threaded rod 42 to adjust the initial height of the self-pickup and drop-off mechanism 6, so that the pickup and drop-off module 63 is aligned with the target pre-assembled circular frame 53. When the electrically controlled magnetic ring sleeve 46 is energized, it generates a magnetic field, which adsorbs the magnetic ring edge 62 of the self-receiving and placing mechanism 6 through the transparent wall of the seawater separation cylinder 1, establishing magnetic coupling. At this time, the turbine adsorption mechanism 7 maintains low-speed operation to maintain the basic eddy current to prevent sedimentation, thereby reducing downtime and ensuring the continuity of the separation process.

[0049] Then, when the detection unit 47 confirms that the enriched resin frame 57 has failed and needs to be replaced, the system initiates the maintenance operation of the self-retrieving and placing mechanism 6. The second servo motor 45 of the external magnetic traction mechanism 4 drives the gear plate to rotate, meshing with the teeth of the outer circle of the ring gear sleeve 44, driving the electrically controlled magnetic ring sleeve 46 and the adsorbed self-retrieving and placing mechanism 6 to rotate around the axis of the seawater separation cylinder 1, positioning the picking and placing module 63 at the target fan-shaped slot 54. At the same time, the first servo motor 41 adjusts the vertical position of the self-retrieving and placing mechanism 6 through the threaded rod 42, so that the opening of the T-shaped arc cavity 631 is aligned with the failed enriched resin frame 57. The first servo telescopic rod 632 of the pick-and-place module 63 extends, driving the arc-shaped hollow frame 633 to move towards the pre-assembled circular frame 53. The magnetic coating 634 at its end contacts and adsorbs with the fan-shaped inner frame 56 of the failed and saturated enriched resin frame 57. Then, it can be retracted by contraction. During the retraction process, its pressure detection rod 635 monitors the contact pressure in real time. When the pressure value reaches the preset threshold, it is determined that the retraction is in place. Then, by rotating the first servo telescopic rod 632 to the other side, it is controlled to extend outward, extending the new fan-shaped inner frame 56 pre-placed on the extended end, pushing the new enriched resin frame 57 into the fan-shaped slot 54, and fixing it by magnetic adsorption. The sealing cloth cover 647 of the sealing module 64 unfolds with the cooperation of the spring winding drum 643 and the electrically controlled winding drum 644, covering the operating area to prevent leakage.

[0050] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pretreatment device for separating radioactive cesium in seawater, comprising a seawater separation cylinder (1), wherein a filter cover (2) for filtering impurities is assembled on the top of the seawater separation cylinder (1), characterized in that: The seawater separation cylinder (1) is equipped with a modular enrichment separation mechanism (5) at its inner center. The modular enrichment separation mechanism (5) is composed of several pre-assembled circular frames (53) stacked upwards. Each pre-assembled circular frame (53) has several enrichment resin frames (57) magnetically adsorbed on it to form a modular separation enrichment column at the center end of the seawater separation cylinder (1). The outer surface of the seawater separation cylinder (1) is provided with an external magnetic traction mechanism (4) that can move up and down along the cylinder wall and rotate around the cylinder. The modular enrichment separation mechanism (5) is slidably provided with a self-retrieving and placing mechanism (6). The self-retrieving and placing mechanism (6) is provided with two sets of symmetrically arranged picking and placing modules (63). Each set of picking and placing modules (63) is provided with a first servo telescopic rod (632) for telescopically picking up and replacing the enriched resin frame (57). The external magnetic traction mechanism (4) is magnetically connected to the self-retrieving mechanism (6), and the self-retrieving mechanism (6) is controlled to move around the modular enrichment separation mechanism (5) through the seawater separation cylinder (1). The failed enrichment resin frame (57) is picked up by the first servo telescopic rod (632) of the one-side pick-up and drop module (63), and a new enrichment resin frame (57) is inserted synchronously on the other side to complete the self-maintenance work of the separation end.

2. The pretreatment device for separating radioactive cesium in seawater according to claim 1, characterized in that, The modular enrichment and separation mechanism (5) includes a circular base (51) fixedly connected to the center of the bottom of the seawater separation cylinder (1). A first insertable circular sleeve (52) is fixedly connected to the upper surface of the circular base (51). A second insertable circular sleeve (59) is also fixedly connected to both ends of the pre-assembled circular frame (53). The pre-assembled circular frame (53) is assembled upwards sequentially through the insertion and engagement of the second insertable circular sleeve (59) and the first insertable circular sleeve (52). The sides are provided with several fan-shaped slots (54) in a circular pattern. A first magnetic plate (55) is fixedly installed on the side of each fan-shaped slot (54). The resin enrichment frame (57) is also fan-shaped as a whole, and the outer surface is fitted with a fan-shaped inner frame (56). A second magnetic plate (58) is fixedly installed on the side of each fan-shaped inner frame (56). The second magnetic plate (58) is inserted into the fan-shaped slot (54) one by one by adsorption and bonding with the first magnetic plate (55).

3. The pretreatment device for separating radioactive cesium in seawater according to claim 2, characterized in that, The self-loading mechanism (6) includes a second ring sleeve (61), which is slidably fitted onto the outside of a ring cylinder composed of several pre-assembled ring frames (53). A magnetic ring edge (62) that is sealed tightly against the inner wall of the seawater separation cylinder (1) is fixedly connected to the outer edge of the second ring sleeve (61). A symmetrical loading and unloading module (63) is arranged on the bottom surface of the second ring sleeve (61), and a sealing module (64) is arranged on the side of each loading and unloading module (63) facing the pre-assembled ring frame (53). The loading and unloading module (63) includes a T-shaped arc cavity (631), and the side of the T-shaped arc cavity (631) facing the pre-assembled ring frame (53) is open. A first servo telescopic rod (632) is fixedly installed inside the T-shaped arc cavity (631), and the output end of the first servo telescopic rod (632) moves telescopically toward the side of the pre-assembled ring frame (53).

4. The pretreatment device for separating radioactive cesium in seawater according to claim 3, characterized in that, The external magnetic traction mechanism (4) includes a first servo motor (41) connected to the bottom of the outer surface of the seawater separation cylinder (1). A threaded rod (42) flush with the seawater separation cylinder (1) is fixedly installed on the output end of the first servo motor (41). A first annular sleeve (43) meshing with the threaded rod (42) is fitted on the outer surface of the seawater separation cylinder (1). A concentric annular gear sleeve (44) is movably installed on the first annular sleeve (43). The outer edge of the ring gear sleeve (44) is provided with a toothed opening. An electrically controlled magnetic ring sleeve (46) is fixedly installed on the upper surface of the ring gear sleeve (44). The magnetic end of the electrically controlled magnetic ring sleeve (46) is attracted to the magnetic ring edge (62) through the seawater separation cylinder (1). A second servo motor (45) is fixedly installed on the side of the first ring sleeve (43). A gear disk that meshes with the outer toothed opening of the ring gear sleeve (44) is fixedly installed on the output end of the second servo motor (45).

5. A pretreatment device for separating radioactive cesium in seawater according to claim 4, characterized in that, The bottom of the seawater separation cylinder (1) is fixedly connected to a base support cover (3). A drain pipe (9) is fixedly installed on the side wall of the base support cover (3). The drain pipe (9) is connected to the center of the bottom of the seawater separation cylinder (1) and is connected to the inside of the circular base (51) to drain the seawater that has completed adsorption and separation. A detection unit (47) is fixedly installed on the upper surface of the electrically controlled magnetic ring sleeve (46). The detection end of the detection unit (47) is close to the outer surface of the seawater separation cylinder (1), and the outer surface of the seawater separation cylinder (1) is visible and transparent. The inside of the circular base (51) is also equipped with a turbine adsorption mechanism (7) that can generate a vortex at the center end of the seawater separation cylinder (1) to drive the seawater to gather towards one end of the modular enrichment and separation mechanism (5) for separation and adsorption.

6. A pretreatment device for separating radioactive cesium in seawater according to claim 5, characterized in that, The turbine adsorption mechanism (7) includes a third servo motor (71) fixedly installed at the center of the inner ring base (51). A cavity rod (72) is fixedly installed on the output end of the third servo motor (71). Several turbine blades (73) are fixedly connected from top to bottom on the outer surface of the cavity rod (72). A second servo telescopic rod (74) is fixedly installed inside the cavity rod (72). The protruding end of the second servo telescopic rod (74) faces the top of the cavity rod (72) and extends from the top of the cavity rod (72). A magnetic chuck (75) is fixedly installed on the protruding end. An electrically controlled magnetic sleeve (76) is movably installed on the magnetic chuck (75). The magnetic end of the electrically controlled magnetic sleeve (76) is attached to the upper surface of the magnetic chuck (75). A water outlet (77) is opened around the bottom of the ring base (51) at the position outside the third servo motor (71).

7. A pretreatment device for separating radioactive cesium in seawater according to claim 6, characterized in that, The electrically controlled magnetic sleeve (76) is externally equipped with an activation mechanism (8), which includes a bent cavity rod (81). A cavity rotating cylinder (82) is movably mounted on the extended end of the bent cavity rod (81). The cavity rotating cylinder (82) is flush with a circular cylinder composed of several pre-assembled circular frames (53). The cavity rotating cylinder (82) is hollow inside, and an injection sleeve (83) is fixedly installed inside the cavity. A diverter cylinder (84) is fixedly connected to the output end of the cylinder (83). Several drainage hoses (85) are connected in parallel to the diverter cylinder (84). Each drainage hose (85) is attached to the inner wall of the cavity rotating cylinder (82) and extends from the top of the side wall of the cavity rotating cylinder (82). A scraping sleeve (86) is fitted on the outer surface of the cavity rotating cylinder (82), and the scraping sleeve (86) connects with the drainage hose (85) extending from the side wall of the cavity rotating cylinder (82).

8. A pretreatment device for separating radioactive cesium in seawater according to claim 7, characterized in that, The activation mechanism (8) further includes an injection push rod (87) inserted into the injection sleeve (83). An external convex plate (88) is fixedly installed on the protruding end of the injection push rod (87). A reset spring (89) is fixedly installed on the external convex plate (88) and is locked at the bottom of the cavity inside the cavity of the rotating cylinder (82). The reset spring (89) pulls the injection push rod (87) to always extend outward, and the protruding end of the injection push rod (87) passes through the bottom of the rotating cylinder (82). A trigger extension rod (810) is fixedly installed on the through end. A ball sleeve (811) is fixedly installed on the extension rod (810), and a wave-shaped ring base (813) is fixedly installed on the upper surface of the second ring sleeve (61). The balls of the ball sleeve (811) are always attached to the upper surface of the wave-shaped ring base (813) under the external pulling action of the return spring (89). A liquid replenishment adsorption hose (812) is also fixedly installed inside the bent cavity rod (81). One side of the liquid replenishment adsorption hose (812) is connected to the injection sleeve (83), and the other side extends out of the bent cavity rod (81).

9. A pretreatment device for separating radioactive cesium in seawater according to claim 8, characterized in that, The pick-and-place module (63) also includes an arc-shaped hollow frame (633) fixedly installed on the output end of the first servo telescopic rod (632). The side wall of the arc-shaped hollow frame (633) is provided with a magnetic coating (634). Pressure detection rods (635) are fixedly installed on the side walls of both sides inside the T-shaped arc cavity (631). The bottom of the T-shaped arc cavity (631) is hinged with an outward-folding bottom plate (636). The bottom of the seawater separation cylinder (1) is also provided with a disassembly plate to open the outward-folding bottom plate (636) for outward folding.

10. A pretreatment device for separating radioactive cesium in seawater according to claim 9, characterized in that, The sealing module (64) includes an arc-shaped frame (641). Limiting side frames (642) are fixedly connected to the upper and lower sides of the arc-shaped frame (641). A spring winding drum (643) is fixedly installed on one side of the arc-shaped frame (641), and an electrically controlled winding drum (644) is fixedly installed on the other side. Two traction ropes (645) stored in the limiting side frames (642) are wound on the electrically controlled winding drum (644). A clamping plate (646) is fixedly connected to the outside of the traction ropes (645). The clamping plate (646) is slidably clamped in the limiting side frames (642). A sealing cloth cover (647) is wound on the spring winding drum (643). The protruding end of the sealing cloth cover (647) is connected to the side wall of the clamping plate (646).

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