Double-layer rotating shield cover plate for main hall of fusion device and control method

Abstract

This invention discloses a double-layer rotating shielding cover and control method for the main hall of a fusion device, belonging to the technical field of top shielding and passageway structure for the main hall of a nuclear fusion experimental device. It includes a fixed and rotating double-layer cover, employing a steel plate-boron-containing polyethylene-steel plate composite structure, balancing radiation shielding and structural strength. Servo drive enables precise positioning of the rotating cover, allowing the square opening and closing door to selectively align with the lower passageway, meeting the daily needs of small component passage; it also supports overall hoisting and removal, accommodating the entry and exit of large equipment. The system is equipped with inflatable multi-stage sealing and negative pressure monitoring to ensure reliable airtightness. This invention achieves automatic positioning, safety interlocking, and status feedback, solving the problems of traditional cover's single function, difficulty in balancing shielding and sealing, and low automation level. It is suitable for fusion experimental facilities with stringent requirements for radiation protection and environmental cleanliness.

Description

Technical Field

[0001] This invention belongs to the technical field of top shielding and passage structure of the main hall of a nuclear fusion experimental device, specifically relating to a double-layer rotating shielding cover and control method for the main hall of a fusion device. Background Technology

[0002] During the operation and maintenance of the main hall of the compact fusion experimental device, its top opening needs to accommodate a number of conflicting requirements: it needs to allow relatively frequent passage of personnel, small tools or components; it needs to allow the hoisting and entry of large components (such as main modules and large diagnostic equipment) during phased operations; and during the operation of the main unit, it must continuously provide effective neutron and gamma-ray shielding and maintain the airtightness between the main hall and the external environment to prevent the diffusion of pollutants or air leakage from affecting the internal cleanliness.

[0003] Existing technical solutions generally suffer from the following bottlenecks:

[0004] 1. Limited functionality and poor adaptability: Traditional fixed or simple sliding covers cannot effectively switch between "daily passage" and "large-item hoisting" modes. They are either designed to be fully open to accommodate large items, resulting in daily shielding failure; or they only have small fixed channels to ensure shielding, which cannot meet the needs of transporting large components.

[0005] 2. Shielding and sealing are difficult to achieve simultaneously: Existing openable structures often have weak points in shielding at joints and hinges, and their sealing performance is insufficient, making it difficult to maintain stable airtightness and radiation protection integrity after repeated opening and closing.

[0006] 3. Cumbersome operation and low degree of automation: The opening, closing and positioning of the cover plate rely heavily on manual operation and vehicle coordination, which is inefficient, has poor positioning accuracy, and lacks real-time monitoring of operating status and safety interlock protection.

[0007] Therefore, there is an urgent need to develop an integrated top cover solution that can intelligently distinguish passage needs, achieve precise partial opening and overall removal, and ensure full-state shielding and sealing performance. Summary of the Invention

[0008] To address the technical challenge of simultaneously optimizing shielding, airtightness, operational efficiency, and intelligence in the roof opening of the main hall of a compact fusion device while meeting diverse passage requirements, this invention provides a double-layer rotating shielding cover and control method for the main hall of a fusion device. This enables rapid, localized, and efficient opening for small components, ensuring effective sealing at interfaces under all operating conditions, and achieving precise, reliable, and automated operation of the entire system. This invention features high-precision rotational positioning, adaptable passageways, overall removability, and integrated high-efficiency radiation shielding and airtightness. It is particularly suitable for specialized industrial facilities with stringent requirements for radiation protection, environmental cleanliness, and airtightness, such as the BEST (Body-Experimental-Compact Fusion Device).

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A double-layer rotating shielding cover for the main hall of a fusion device includes a rotatable upper cover, a fixed lower cover, and a centralized control system. The lower cover is fixedly installed at the opening at the top of the main hall and has a circular channel for aligning with a square door on the upper cover. The upper cover is rotatably positioned below the lower cover. A drive motor assembly for the lower cover rotates the upper cover relative to the lower cover, aligning or offsetting the circular channel with the square door. When the circular channel and the square door are aligned, a through passage is formed; when the circular channel and the square door are offset, the through-holes are aligned. A double-layered overlapping shielding structure is formed; the door opening and closing drive motor assembly controls the opening and closing of the square door; the lower cover plate integrates an inner ring airtight system to achieve sealing between the lower cover plate and the upper cover plate, an outer ring airtight system to achieve sealing between the outer edge of the lower cover plate and the wall, and a lower airtight system for the door to achieve sealing between the circular channel and the square door; the centralized control system is connected to the lower cover plate drive motor assembly, the door opening and closing drive motor assembly, and various sensors, as well as the inner ring airtight system, outer ring airtight system, and lower airtight system for the door through an industrial communication protocol, and performs real-time data exchange and command issuance.

[0011] This invention also provides a control method for the aforementioned double-layer rotating shielding cover of the main hall of a fusion device, comprising the following steps: a centralized control system controls the lower cover drive motor assembly to rotate the upper cover relative to the lower cover according to instructions; when it is necessary to open the passageway, the upper cover is controlled to rotate so that the square opening and closing door is aligned with the circular passage of the lower cover; when it is necessary to close the passageway, the upper cover is controlled to rotate so that the square opening and closing door is completely misaligned with the circular passage of the lower cover, forming an overlapping shielding structure; during the rotation process, the rotation angle position of the upper cover is monitored in real time and fed back to the centralized control system for closed-loop adjustment.

[0012] Beneficial effects:

[0013] 1. This invention employs a rotatable upper cover design, allowing a single square door to be aligned with any one of the multiple fixed circular channels on the lower level, creating a flexible "one-to-many" passageway. For regular small-sized passages, simply opening the square door creates a small vertical passage, meeting most daily passage needs. When oversized components need to enter, the cover can be rotated to a position that does not obstruct hoisting and then locked, or the entire double-layer cover (or single-layer cover) can be lifted off using the lifting lugs on the cover via a lobby crane, creating a completely open overhead space. This clearly differentiated design of "partial alignment and opening" and "overall lifting" modes resolves the contradiction of a single structure being unable to accommodate both, greatly improving operational planning efficiency and equipment utilization.

[0014] 2. Regarding radiation shielding, the main body of the cover plate adopts a composite sandwich structure of "steel plate-boron-polyethylene plate-steel plate". The boron-polyethylene plate can efficiently slow down and absorb neutrons, while the steel plate provides gamma-ray shielding and structural strength. In the "closed" and "partially open" states, the projected area of ​​the double-layer cover plate and its internal shielding material completely covers the top of the main unit hall, ensuring shielding integrity. The high-efficiency boron-polyethylene shielding material is embedded in the double-layer steel cover plate structure in a modular form, which not only provides excellent radiation protection but also ensures the structural strength of the cover plate and its overall integrity as a lifting component.

[0015] 3. The airtightness of this invention is achieved through a two-stage sealing system. An airtight system consisting of inflatable sealing strips is installed between the upper and lower cover plates and the concrete wall. Upon closing, it automatically inflates to form a flexible high-pressure seal. A rubber sealing strip is provided around the square opening / closing door, and an airtight system is installed below the opening / closing door at the lower circular passageway. A negative pressure sensor monitors pressure changes within the sealed cavity in real time, providing quantitative assessment and alarms for airtightness, ensuring the reliability of airtightness under operating conditions.

[0016] 4. The rotation drive of the upper cover plate of this invention adopts a mechanism combining a servo motor, reducer, gear, and rack, combined with a high-precision position sensor, which can achieve rapid and accurate positioning at any angle in the circumferential direction of the cover plate, ensuring precise alignment between the opening / closing door and the lower passage; the linear opening and closing of the square opening / closing door is driven by a motor drive assembly through a gear and rack, ensuring smooth operation. The entire system is centrally controlled by a centralized control system, featuring automatic positioning, programmed operation, safety interlock (if the rotation is not in place, the opening / closing door cannot be opened), status feedback, and fault diagnosis functions, significantly reducing the difficulty and error risk of manual operation.

[0017] 5. This invention adopts a modular design, with drive components (motor, reducer, gears), sensing units, sealing strips, etc., all having modular structures, facilitating maintenance and replacement. Multiple safety measures are implemented: the rotating mechanism is equipped with a mechanical locking device to prevent malfunction; the system has anti-collision detection; and the control logic integrates interlocking interfaces with the lobby crane and area radiation monitoring systems, comprehensively ensuring the safety of personnel and equipment. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of a double-layer rotating shielding cover for the main hall of a fusion device according to the present invention;

[0019] Figure 2 This is a three-dimensional view of the upper cover plate;

[0020] Figure 3 This is a schematic diagram showing the opening of a double-layer rotating shielding cover for the main hall of a fusion device according to the present invention.

[0021] Figure 4 This is a sectional view of the upper cover plate;

[0022] Figure 5 This is a top view of the upper cover plate;

[0023] Figure 6 This is a diagram showing the internal structure of the lower cover plate;

[0024] Figure 7 for Figure 2 A flipped image;

[0025] Figure 8 This is a schematic diagram of the airtight system support and airbag;

[0026] Figure 9 This is a schematic diagram of the lower cover plate drive motor assembly;

[0027] Figure 10 This is a schematic diagram of the door opening and closing drive motor assembly;

[0028] Figure 11 This is a schematic diagram of the door leaf opening and closing.

[0029] The attached figures are labeled as follows: 1. Rotary double-layer cover plate unit; 11. Upper cover plate; 12. First lifting lug; 13. Track roller; 14. Square opening and closing door; 141. Linear guide rail; 142. Opening and closing door drive motor assembly; 1421. First gear; 1422. First drive mounting base; 1423. First motor; 143. Opening and closing door rack; 144. Slider; 145. Opening and closing door leaf; 15. Rubber sealing strip; 16. Upper boron-containing polyethylene plate; 17. Upper cover plate rack; 18. Sensor detection bracket; 19. Upper support for the opening and closing door airbag; 110. Inner support for the upper cover plate airbag. ; 111. Outer airbag bracket of upper cover plate; 2. Rotary drive and opening / closing mechanism; 21. Lower cover plate; 22. Outer ring airtight system; 23. Second lifting lug; 24. Lower airtight system of opening / closing door; 25. Lower cover plate drive motor assembly; 26. Inner ring airtight system; 27. Outer air pressure sensor; 28. Inner ring airtight system mounting slot; 29. ​​Negative pressure sensor; 212. Multipath channel; 251. Second gear; 252. Second drive mounting base; 253. Reducer; 254. Second motor; 3. Shielding and airtight system; 31. Airtight system bracket; 32. Airbag; 4. Centralized control system. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figure 1 , Figure 3 As shown, the double-layer rotating shielding cover for the main hall of a fusion device according to the present invention includes a rotating double-layer cover unit 1, a rotating drive and opening / closing mechanism 2, a shielding and airtight system 3, and a centralized control system 4. The rotating double-layer cover unit 1, the rotating drive and opening / closing mechanism 2, the shielding and airtight system 3, and the centralized control system 4 work together to achieve precise rotational alignment, partial / overall opening, efficient shielding, and reliable sealing. The centralized control system 4 controls the opening and closing of the rotating drive and opening / closing mechanism 2. A rotating double-layer cover unit 1 is installed at the top opening of the main hall; a rotating drive and opening / closing mechanism 2 is fixed on the lower cover 21 of the rotating double-layer cover unit 1, driving the upper cover 11 of the rotating double-layer cover unit 1 to rotate and the square opening / closing door 14 of the rotating drive and opening / closing mechanism 2 to open and close; a shielding and airtight system 3 is arranged between the upper cover 11 and the lower cover 21 and at the contact surfaces of the upper cover 11, the lower cover 21 and the wall; a centralized control system 4 is located in the field control cabinet, electrically connecting the drive sensor and the airtight valve group to realize automatic control and safety interlock.

[0032] like Figure 2 As shown, the rotating double-layer cover plate unit 1 is the core load-bearing and shielding structure of the system. It adopts a two-layer independent cover plate design, namely, a rotatable upper cover plate 11 and a fixed lower cover plate 21. The first lifting lug 12 is fixedly installed on the upper surface of the upper cover plate 11 and is evenly arranged circumferentially for overall lifting. The upper cover plate 11, as a movable layer, is a key execution component of this invention. The main structural component of the upper cover plate 11 adopts a composite sandwich structure of steel plate-boron-containing polyethylene plate-steel plate, which combines structural strength and neutron and gamma-ray shielding functions. Track rollers 13 are installed on the outer edge of the upper cover plate 11, enabling it to run along a preset outer track.

[0033] like Figure 4 , Figure 5 , Figure 7 , Figure 10 , Figure 11 As shown, a square door 14 is provided on the upper cover plate 11. The square door 14 includes a door leaf 145, a linear guide rail 141, a slider 144, a door rack 143, and a door drive motor assembly 142. The linear guide rail 141 is fixedly installed in the mounting groove of the upper cover plate 11, and the slider 144 is slidably mounted on the linear guide rail 141; the slider 144 is rigidly connected to the door leaf 145; the door rack 143 is fixed to the side of the door leaf 145 and meshes with the first gear 1421 in the door drive motor assembly 142 to realize the linear opening and closing of the door; the entire structure constitutes a square door 14 that can slide linearly. Rubber sealing strips 15 are installed on the four sides of the door leaf 145, and the door leaf 145 is pressed and sealed with the upper cover plate 11 when closed. The top of the upper cover plate 11 is equipped with a first lifting lug 12 for overall lifting operations. An upper cover plate rack 17 is also fixed to the edge of the upper cover plate 11, meshing with the second gear of the lower cover plate drive motor assembly 25. The inner side of the upper cover plate 11 is equipped with a sensor detection bracket 18, an upper support 19 for the door opening / closing airbag, an inner airbag support 110, and an outer airbag support 111 for installing relevant sensing and sealing components. The upper cover plate rack 17 is arc-shaped.

[0034] like Figure 6 As shown, the lower cover plate 21 is fixedly installed on the top of the main hall and has at least one circular channel, which constitutes a multi-path channel 212; the upper cover plate 11 is installed on the lower cover plate 21 or the main hall structure, and the upper cover plate 11 has a square opening and closing door 14; the rotation drive and opening and closing mechanism 2 drives the upper cover plate 11 to rotate so that the square opening and closing door 14 is selectively aligned with any of the circular channels on the lower cover plate 21.

[0035] The lower cover plate 21 is a relatively fixed reference layer. The main structural components of the lower cover plate 21 adopt the same composite shielding structure as the main structure of the upper cover plate 11. An outer ring airtight system 22 is installed on the outer edge of the lower cover plate 21 in contact with the concrete structure. The upper surface of the lower cover plate 21 is provided with a second lifting lug 23, which is embedded with a boron-containing polyethylene plate. The lower cover plate 21 also integrates an inner ring airtight system 26 for sealing when docking with the upper cover plate 11. The outer ring airtight system 22 achieves the sealing between the outer edge of the lower cover plate 21 and the wall. The lower airtight system 24 of the opening and closing door includes an airtight base, an inflatable airbag, a sealing strip, and an air pipe interface, which are integrated as a whole at the upper edge of each circular channel of the lower cover plate 21. Figure 6 (Only one is shown in the image), which connects with the square opening and closing door to achieve partial sealing of the passage and sealing at the passage opening. The lower cover plate drive motor assembly 25 is fixedly embedded in the outer area of ​​the upper surface of the lower cover plate 21, avoiding the passage and sealing area, and does not interfere with the rotation of the upper cover plate 11. It is used to drive the rotation of the upper cover plate 11. The inner ring airtight system 26 is arranged around the outer ring of all the circular channels of the lower cover plate 21 and is embedded in the inner ring airtight system mounting groove 28, serving as a second airtight defense line. The outer pressure sensor 27 is installed on the outer edge of the lower cover plate 21, next to the outer ring airtight system 22, close to the concrete wall, and is used to collect the pressure of the outer ring sealing cavity in real time. The inner ring airtight system mounting groove 28 is arranged around the outer ring of all the circular channels of the lower cover plate 21 and is used to install the inner ring airtight system 26. The negative pressure sensor 29 is installed in the inner sealing cavity area of ​​the lower cover plate 21, extending into the airtight cavity, and is used to detect the negative pressure value of the overall sealed space. The positioning sensors are arranged in two groups: one group is installed next to the circular channel of the lower cover plate 21 to detect whether the upper cover plate 11 is rotated and aligned; the other group is installed on the side of the square door 14 of the upper cover plate 11 to detect whether the door leaf 145 is open or closed, thus detecting alignment and closing. The lower boron-containing polyethylene board is embedded in the steel plate interlayer of the lower cover plate 21, serving as the core shielding material of the lower cover plate 21. The entire board is fully covered to achieve neutron and gamma-ray radiation shielding.

[0036] The upper cover 11 sits on a pre-installed outer track on the building structure via its track rollers 13, allowing it to rotate 360 ​​degrees. The rotation of the upper cover 11 enables its square opening and closing door 14 to be precisely driven to align with the circular passage of the lower cover 21.

[0037] like Figure 8 , Figure 9 , Figure 10As shown, the rotary drive and opening / closing mechanism 2 provides precise and controllable power to the rotary double-layer cover unit 1, realizing two core actions: rotation and linear opening / closing. The airtight system bracket 31 is fixedly installed inside the outer track, and the airbag 32 is installed on the airtight system bracket 31 for airtight sealing of the track area. The lower cover drive motor assembly 25 is fixedly installed on the lower cover 21 and is the power source for driving the upper cover rotation. The lower cover drive motor assembly 25 includes a second motor 254 providing power, a reducer 253 increasing output torque, a second drive mounting base 252 fixing the entire assembly, and a second gear 251 meshing with the upper cover rack 17. By controlling the direction and speed of the second motor 254, the rotation angle of the upper cover 11 can be precisely controlled. The second drive mounting base 252 is fixed on the upper surface of the lower cover plate 21. The second motor 254 and the reducer 253 are sequentially mounted on the second drive mounting base 252. The output end of the reducer 253 is connected to the second gear 251, which forms a transmission engagement with the upper cover plate rack 17. The second gear 251 meshes with the upper cover plate rack 17 and runs. The power transmission process during operation is as follows: second motor 254 → reducer 253 → second gear 251 → upper cover plate rack 17, which drives the upper cover plate 11 to rotate.

[0038] The door opening and closing drive motor assembly 142 is integrated into the square door 14 of the upper cover plate 11 and is responsible for opening and closing the door. The door opening and closing drive motor assembly 142 includes a first motor 1423, a first drive mounting base 1422, and a first gear 1421 that meshes with the door opening and closing rack 143. The first drive mounting base 1422 is fixed to the upper cover plate 11, the first motor 1423 is mounted on the mounting base, the first gear 1421 meshes with the door opening and closing rack 143, the first motor 1423 drives the first gear 1421, and drives the first gear 1421 and the door leaf 145 connected thereto to move along the linear guide rail 141.

[0039] The shielding and airtight system 3 ensures the radiation safety and environmental isolation of this invention under any operating conditions. The core shielding function is provided by the upper boron-containing polyethylene board 16 and the lower boron-containing polyethylene board embedded within the main structure of the upper and lower cover plates. The upper boron-containing polyethylene board 16 belongs to the upper cover plate 11, and the lower boron-containing polyethylene board belongs to the lower cover plate 21. The projected area of ​​the components containing the boron-containing polyethylene boards has been calculated to ensure effective coverage of the hall's ceiling area when the cover plates are closed, meeting radiation protection requirements.

[0040] The inner ring airtight system of the shielding and airtight system 3 is used for dynamic sealing of the docking channel between the upper cover plate 11 and the lower cover plate 21. The inner ring airtight system includes the inner ring airtight system 26 on the lower cover plate and the lower airtight system 24 of the opening and closing door, as well as the corresponding upper support 19 of the opening and closing door airbag and the inner side airbag support 110 of the upper cover plate 11. When the square opening and closing door 14 of the upper cover plate 11 and each circular channel of the multi-path channel 212 of the lower cover plate 21 are aligned, the inner ring airtight system inflates and expands, working in conjunction with the rubber sealing strip 15 of the square opening and closing door 14 to form a tight seal around the opening of the channel formed by the square opening and closing door 14.

[0041] The negative pressure sensor 29 and the outer air pressure sensor 27 equipped in this invention are used to monitor the pressure status in the sealed cavity formed by the inner ring airtight system and the outer ring airtight system 22 in real time, providing direct data for evaluating the sealing effectiveness, and can trigger an alarm when abnormal.

[0042] The sensing and acquisition unit of the centralized control system 4 is used to ensure motion accuracy and safety, and integrates multiple sensors. The position sensor is used to monitor the drive status; the positioning sensor is used to accurately detect whether the upper cover plate has rotated to the preset alignment position or the opening and closing end point of the door; the outer air pressure sensor 27 on the outer side of the outer ring airtight system 22 between the outer side of the lower cover plate 21 and the outer concrete structure is used to monitor the pressure of the outer ring airtight system.

[0043] The centralized control system 4 is responsible for coordinating all actions, processing sensor signals, and ensuring operational safety. The centralized control system 4 includes a main controller, which uses a control cabinet as its control core and typically incorporates a PLC. The centralized control system 4 internally stores the three-dimensional spatial coordinate model of the cover plate of this invention and preset safety positions. The centralized control system 4 exchanges data and issues commands in real time with the lower cover plate drive motor assembly 25, the door opening / closing drive motor assembly 142, various sensors, and the solenoid valves of each airtight system via an industrial communication protocol.

[0044] The centralized control system 4 automatically executes the following process according to operator instructions: 1) Planning the rotation path of the upper cover plate 11; 2) Starting the second rotation drive motor 254 and the first door opening / closing drive motor 1423, and performing closed-loop precise positioning based on feedback from position sensors, etc.; 3) After reaching the target position, triggering the inner ring docking airtight system and the outer ring airtight system 22 to establish a seal; 4) After confirming that the sealing pressure is normal through the outer air pressure sensor 27 and the negative pressure sensor 29, controlling the door leaf 145 to open. The entire process is equipped with safety interlocks. The control cabinet of the centralized control system 4 integrates a human-machine interface, which displays key information such as the cover plate rotation angle, door opening / closing status, inner and outer ring sealing pressure, and system alarms in real time, and allows the operator to select modes, manually fine-tune, and monitor the status.

[0045] Preferably, both the outer ring airtight system 22 and the inner ring airtight system 26 include an airtight rubber ring.

[0046] The working process of this invention follows the steps of demand identification, automatic planning, precise execution, and status confirmation, specifically including:

[0047] 1. Initialization and self-test: After the system is powered on, the PLC controls each actuator to reset to a safe position (such as when the door is closed), reads the zero point of the position sensor, detects the pressure status of the sealing system, and completes the self-test.

[0048] 2. Standard small-size passage mode:

[0049] (1) Command reception: The operator selects “Access Mode” on the touch screen and enters or selects the target channel number.

[0050] (2) Path planning and rotation alignment: The PLC calculates the required rotation angle of the upper cover plate 11 based on the target channel position. Then, the rotation drive and opening / closing mechanism 2 are started to drive the upper cover plate 11 to rotate. The position sensor provides real-time feedback of the angle, and the PLC performs closed-loop PID control until the center of the square opening / closing door 14 is aligned with the center of the circular channel of the lower cover plate 21 (within the allowable error range), then the rotation stops and the mechanical locking is triggered.

[0051] (3) Seal establishment and opening: The PLC commands the outer ring airtight system 22 to maintain the air intake state, and at the same time commands the lower airtight system 24 and the inner ring airtight system 26 of the opening and closing door to intake. The rubber sealing strip 15 is not in close contact with each component. The PLC then commands the first motor 1423 of the square opening and closing door 14 to open the door leaf 145 smoothly, forming a passage.

[0052] (4) Passage and Closure: After personnel / equipment have passed through, the operator issues a closure command. The PLC controls the square door 14 to close in place. After confirming that the door sealing strip is tightened, the system returns to standby state after the sealing pressure reaches the set value (confirmed by the negative pressure sensor 29).

[0053] 3. Large component arrival mode:

[0054] (1) Command reception: The operator selects "large item hoisting mode".

[0055] (2) Cover plate clearance: The PLC first controls the square door 14 to fully close and lock. Then, the following strategy is adopted:

[0056] Overall Lifting Strategy: This is the standard procedure for handling oversized components. The system controls the rotation of the cover plate to a "lifting angle" that facilitates the hooking of the lifting equipment. The operator uses the overhead crane to lift the upper cover plate 11 using the first lifting lug 12 and the lower cover plate 21 using the second lifting lug 23. The upper cover plate 11 (or both covers together) is lifted off the ground and removed from the work area, placed on the designated storage rack. At this point, the top is completely open.

[0057] (3) On-site operation: After the large components are hoisted, reverse the operation to hoist the upper cover plate 11 and the lower cover plate 21 back, install and reset them.

[0058] 4. Reset and safety monitoring:

[0059] (1) In any mode, the system continuously monitors key parameters. If abnormal resistance (possibly due to collision or compression) is detected during rotation, it will immediately stop.

[0060] (2) An alarm will be triggered when the sealing pressure is lower than the threshold.

[0061] (3) The system status and all operation logs are displayed and stored in real time, which facilitates traceability and maintenance.

[0062] Preferably, the square door 14 can be driven by a lead screw and nut or a hydraulic cylinder.

[0063] Preferably, the airbag / inflatable sealing strips in the outer ring airtight system 22, the inner ring airtight system 26, and the lower airtight system 24 of the opening and closing door can be inflatable sealing strips, or can be replaced with magnetic sealing strips (such as rubber embedded permanent magnets) or composite labyrinth sealing structures, which are suitable for scenarios where the compressed air source is limited or where there are higher requirements for sealing durability.

[0064] Preferably, the boron-containing polyethylene board can be optimized according to the radiation spectrum and replaced with boron carbide polyethylene board, a composite sandwich structure of boron steel and lead, or a new metal hydride shielding material.

[0065] Preferably, the PLC can be replaced with a distributed control system based on an industrial PC (IPC), or connected to a factory Internet of Things (IIoT) platform to achieve more advanced data analysis, predictive maintenance, and remote expert support functions.

[0066] Preferably, in addition to the encoder, a laser rangefinder or a vision recognition system can be added for position detection, for secondary calibration and redundant verification of alignment accuracy.

[0067] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fusion device main hall double-layer rotating shield cover plate, characterized in that, The application relates to a rotating cover plate system for a mainframe hall, which comprises a rotatable upper cover plate, a fixed lower cover plate and a centralized control system. The upper cover plate is rotatably arranged below the lower cover plate, and is driven to rotate relative to the lower cover plate by a lower cover plate driving motor assembly, so that the circular passage is aligned with or deviated from the square opening of the square opening and closing door; when the circular passage is aligned with the square opening and closing door, a through passage is formed; when the circular passage is deviated from the square opening and closing door, a double-layer overlapping shielding structure is formed; an opening and closing door driving motor assembly controls the opening and closing of the square opening and closing door; the lower cover plate is integrated with an inner ring air-tight system for realizing the sealing between the upper cover plate and the lower cover plate, an outer ring air-tight system for realizing the sealing between the outer edge of the lower cover plate and the wall body and a lower opening and closing door air-tight system for realizing the sealing between the circular passage and the square opening and closing door; the centralized control system is connected with the lower cover plate driving motor assembly, the opening and closing door driving motor assembly and various sensors and the inner ring air-tight system, the outer ring air-tight system and the lower opening and closing door air-tight system through an industrial communication protocol, and real-time data exchange and instruction issuing are realized.

2. A fusion device main hall double-layer rotating shield cover plate according to claim 1, characterized in that, The edge of the upper cover plate is fixed with an upper cover plate rack; the lower cover plate driving motor assembly comprises a second motor for providing power, a speed reducer for increasing output torque, a second driving mounting seat for fixing the whole assembly and a second gear for engaging and driving the upper cover plate rack on the upper cover plate; the second driving mounting seat is fixed on the upper surface of the lower cover plate, and the second motor and the speed reducer are sequentially assembled on the second driving mounting seat; the output end of the speed reducer is connected with the second gear, and the second gear is in transmission cooperation with the upper cover plate rack.

3. A fusion device main hall double-layer rotating shield cover plate according to claim 2, characterized in that, The rotation direction and rotation speed of the second motor are controlled to control the rotation angle of the upper cover plate.

4. A fusion device main hall double-layer rotating shield cover plate according to claim 1, characterized in that, The square opening and closing door comprises an opening and closing door leaf, a linear guide rail, a sliding block, an opening and closing door rack and an opening and closing door driving motor assembly; the linear guide rail is fixedly installed in a mounting groove of the upper cover plate, and the sliding block is slidingly assembled on the linear guide rail; the sliding block is rigidly connected with the opening and closing door leaf; the opening and closing door rack is fixed on the side of the opening and closing door leaf and is engaged with a first gear in the opening and closing door driving motor assembly, so that the linear opening and closing of the square opening and closing door are realized.

5. A fusion device main hall double-layer rotating shield cover plate according to claim 4, characterized in that, Rubber sealing strips are installed on the four side surfaces of the opening and closing door leaf.

6. A fusion device main hall double-layer rotating shield cover plate according to claim 1, characterized in that, An outer side air pressure sensor is installed on the outer edge of the lower cover plate and the side of the outer ring air-tight system, and is used for collecting the pressure of the outer ring sealing cavity of the outer ring air-tight system in real time.

7. A fusion device main hall double-layer rotating shield cover plate according to claim 1, characterized in that, The lower cover plate and the upper cover plate are both composite sandwich structures of steel plate-boron-containing polyethylene plate-steel plate.

8. A fusion device main hall double-layer rotating shield cover plate according to claim 1, characterized in that, A negative pressure sensor is installed in the inner side sealing cavity area of the lower cover plate and extends into the inner side sealing cavity area, and is used for detecting the negative pressure value of the inner side sealing cavity area.

9. A fusion device main hall double-layer rotating shield cover plate according to claim 4, characterized in that, Two groups of in-place sensors are further included, one group of which is installed beside the circular passage of the lower cover plate and is used for detecting whether the upper cover plate is rotated and aligned in place, and the other group of which is installed on the side of the square opening and closing door of the upper cover plate and is used for detecting whether the opening and closing door leaf of the square opening and closing door is opened and closed in place.

10. A control method of a fusion device main hall double-layer rotating shield cover plate according to any one of claims 1 to 9, characterized by, The method comprises the following steps: a centralized control system controls a lower cover plate driving motor assembly to drive a upper cover plate to rotate relative to the lower cover plate according to an instruction; when it is needed to open a passing channel, the upper cover plate is controlled to rotate so that a square opening and closing door is aligned with a circular channel of the lower cover plate; when it is needed to close the passing channel, the upper cover plate is controlled to rotate so that the square opening and closing door is completely misaligned with the circular channel of the lower cover plate, forming an overlapping shielding structure; and a rotation angle position of the upper cover plate is monitored in real time during the rotation and fed back to the centralized control system for closed-loop adjustment.

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