Ex-reactor nuclear detector mounting device

Abstract

The invention provides an out-of-pile nuclear detector mounting device, and relates to the technical field of nuclear detection, and the out-of-pile nuclear detector mounting device comprises a fixed frame, a fixed cylinder, a first telescopic cylinder and a second telescopic cylinder; one end of the fixed cylinder is fixedly arranged on the fixed frame, and the other end vertically extends upwards; the first telescopic cylinder is coaxially arranged in the fixed cylinder in a sleeved mode and can slide in the axial direction of the fixed cylinder. The number of the second telescopic cylinders is one or more, the multiple second telescopic cylinders are coaxially arranged in a sleeving mode according to the outer diameter decreasing sequence, the second telescopic cylinder on the outermost layer is coaxially arranged in the first telescopic cylinder in a sleeving mode, and the top end of the second telescopic cylinder on the innermost layer is used for being connected with a nuclear detector; the driving device is used for driving the first telescopic cylinder to stretch out and draw back relative to the fixed cylinder and driving all the second telescopic cylinders to stretch out and draw back synchronously through the first telescopic cylinder. According to the device, the multi-stage telescopic cylinder bodies which are coaxially nested are adopted, the large-range lifting function is achieved while the compact storage size is kept, and the detector can be efficiently installed at the designated position of the upper portion of a reactor cavity.

Description

Technical Field

[0001] The present application relates to the field of nuclear detection technology, and in particular to an installation device for an off-core nuclear detector. Background Art

[0002] The ex-core nuclear instrumentation system is a safety-level device that continuously monitors reactor power, power level fluctuations, and power distribution by measuring the neutron flux rate leaking from the reactor core. It serves as a key input parameter for the reactor protection system and the power plant's five control systems. The ex-core nuclear detectors are the eyes of the ex-core nuclear instrumentation system, located outside the reactor pressure vessel to directly detect the neutron flux rate level leaking from the core.

[0003] At present, the off-core detectors are installed from the bottom of the reactor cavity upwards. This installation method is limited by the narrow installation space at the bottom of the reactor cavity. The off-core nuclear detection detectors must be installed in sections using special tools. Therefore, the operation steps are cumbersome and complicated, and the installation time is quite long. Since the radiation dose at the bottom of the reactor cavity is very high 24 hours after the reactor is shut down, maintenance personnel need to directly enter the high-radiation, narrow space at the bottom of the reactor cavity to perform loading, unloading and installation operations. Even if the maintenance personnel wear a full set of radiation protection clothing, they will be exposed to a large dose of radiation.

[0004] Although there are some auxiliary robots on the market that can lift the detector from the bottom of the reactor cavity to a certain height above the reactor cavity through a lifting mechanism, the height from the bottom of the reactor cavity to the ground is usually around 2 meters. The lifting mechanism of the auxiliary robot has a limited stroke and cannot lift the detector to a higher position above the reactor cavity, which has certain installation limitations. Summary of the Invention

[0005] In view of this, the present application proposes an off-core nuclear detector installation device to solve the problem that the existing auxiliary installation device cannot install the detector to a higher position above the reactor cavity in the narrow installation space at the bottom of the reactor cavity, resulting in installation limitations.

[0006] The technical solution of this application is achieved as follows: The present application provides an out-of-core nuclear detector installation device, comprising: Fixed frame; A fixed cylinder, one end of which is fixedly mounted on a fixed frame and the other end of which extends upward in a vertical direction; The first telescopic cylinder is coaxially sleeved inside the fixed cylinder and can slide along the axial direction of the fixed cylinder; The second telescopic cylinder is provided with one or more second telescopic cylinders, and the plurality of second telescopic cylinders are coaxially sleeved in descending order of outer diameter, and the outermost second telescopic cylinder is coaxially sleeved within the first telescopic cylinder, and the top end of the innermost second telescopic cylinder is used for connecting to the nuclear detector; The driving device is used to drive the first telescopic cylinder to extend and retract relative to the fixed cylinder, and to drive all the second telescopic cylinders to extend and retract synchronously through the first telescopic cylinder.

[0007] On the basis of the above technical solution, preferably, the driving device includes a power assembly and a plurality of transmission ropes; A power assembly, used for driving the first telescopic cylinder to extend and retract relative to the fixed cylinder; The transmission rope is configured as follows: When the number of the second telescopic cylinder is 1, a transmission rope is provided, which passes around the top and bottom of the first telescopic cylinder, and the two ends are respectively connected to the top of the fixed cylinder and the bottom of the second telescopic cylinder; When the number of the second telescopic cylinders is M, and M ≥ 2, M transmission ropes are provided, including: The first transmission rope passes around the top and bottom of the first telescopic cylinder and connects the top of the fixed cylinder and the bottom of the first-stage second telescopic cylinder. The second transmission rope passes around the top and bottom of the first-stage second telescopic cylinder and connects the top of the first telescopic cylinder and the bottom of the second-stage second telescopic cylinder. Starting from the 3rd transmission rope, each nth transmission rope passes around the top and bottom of the n-1th second telescopic cylinder, with the upper end connected to the top of the n-2th second telescopic cylinder and the lower end connected to the bottom of the nth second telescopic cylinder, where n is an integer greater than or equal to 3 and less than or equal to M.

[0008] On the basis of the above technical solution, preferably, the power assembly includes a drive device and a transmission assembly; The driving device is arranged on the fixed frame and includes a driving wheel and a motor for driving the driving wheel to rotate; The transmission assembly includes a first guide wheel and a drive rope. The first guide wheel is arranged at the top of the fixed cylinder. The drive rope has a first end fixedly connected to the bottom of the first telescopic cylinder, passes around the first guide wheel and the drive wheel in sequence, and has a second end fixedly connected to the bottom of the first telescopic cylinder.

[0009] On the basis of the above technical solution, preferably, second guide wheels are fixedly provided on the top and bottom of the first telescopic cylinder and the second telescopic cylinder around which the transmission rope passes, respectively.

[0010] On the basis of the above technical solution, preferably, a first limiting ring is provided on the inner side of the top of the fixed cylinder, and a second limiting ring is provided on the inner side of the bottom of the fixed cylinder; A third limiting ring is provided on the inner side of the top of the first telescopic cylinder, and a fourth limiting ring and a fifth limiting ring are provided on the outer side and inner side of the bottom of the first telescopic cylinder respectively. The outer diameter of the fourth limiting ring is larger than the inner diameters of the first limiting ring and the second limiting ring, and the outer diameter of the first telescopic cylinder is smaller than the inner diameter of the first limiting ring; The outer diameter of the second telescopic cylinder is smaller than the inner diameter of the third limiting ring. The sixth limiting ring is arranged on the inner side of the top of the second telescopic cylinder. The seventh limiting ring and the eighth limiting ring are arranged on the outer and inner sides of the bottom of the second telescopic cylinder respectively. The outer diameter of the seventh limiting ring is larger than the inner diameters of the third limiting ring and the fifth limiting ring.

[0011] On the basis of the above technical solution, preferably, the inner circumference of the first limiting ring is evenly provided with a number of first rollers in contact with the outer wall of the first telescopic cylinder, the inner circumference of the third limiting ring is evenly provided with a number of second rollers in contact with the outer wall of the second telescopic cylinder, and the outer circumference of the seventh limiting ring is evenly provided with a number of third rollers in contact with the inner wall of the first telescopic cylinder, and the rolling direction of the first roller, the second roller and the third roller is consistent with the telescopic direction of the second telescopic cylinder.

[0012] On the basis of the above technical solution, preferably, the lengths of the first telescopic cylinder and the second telescopic cylinder are equal.

[0013] On the basis of the above technical solution, preferably, two drive ropes are symmetrically arranged, and the two drive ropes are symmetrically distributed relative to the radial center of the fixed cylinder; the transmission rope is arranged inside the fixed cylinder, each transmission rope is symmetrically distributed relative to the radial center of the fixed cylinder, and at least one transmission rope is arranged on one side.

[0014] On the basis of the above technical solution, preferably, the driving device further includes a first rotating shaft, a second rotating shaft, a first tensioning roller, a second tensioning roller, a first belt and a second belt; The first rotating shaft, the second rotating shaft, the first tensioning roller and the second tensioning roller are arranged on the fixed frame for parallel rotation; The two driving wheels are fixedly arranged on the first rotating shaft and the second rotating shaft respectively; The output shaft of the motor is rotatably connected to the first tensioning roller, the first tensioning roller and the second tensioning roller are respectively tensionedly connected to the driving rope, and the first tensioning roller and the second tensioning roller are connected via a first belt transmission; The first tensioning roller and the first rotating shaft are connected as well as the second tensioning roller and the second rotating shaft are connected respectively via a second belt transmission.

[0015] On the basis of the above technical solution, preferably, a support frame fixedly connected to the top of the fixed cylinder is further provided above the fixing frame.

[0016] Compared with the prior art, this application has the following beneficial effects: (1) The collaborative design of the fixed frame, fixed cylinder, and multi-stage telescopic cylinder solves the installation problem of nuclear detectors in a confined and high-radiation environment. The device uses coaxially nested multi-stage telescopic cylinders, which achieve a wide range of lifting and lowering functions while maintaining a compact storage size, allowing the detector to be safely and efficiently installed at the designated position above the reactor cavity. The synchronous control of the drive device ensures the coordinated operation of the multi-stage telescopic cylinder. The overall design significantly reduces the risk of radiation exposure to operators and improves the safety and efficiency of nuclear power plant maintenance operations.

[0017] (2) Through the coordinated design of multi-stage transmission ropes and the second guide wheel, a hierarchical linkage transmission structure is adopted, so that the telescopic cylinders at each level move in a coordinated manner as if they were a whole, achieving completely synchronized lifting and lowering movements. This design transmits the driving force step by step through the pulley principle, forming a rigid motion transmission chain, ensuring that the displacement of each level remains strictly consistent. Compared with the traditional step-by-step telescopic method, this synchronous mechanism can achieve a wide range of lifting strokes while maintaining a compact storage size, perfectly adapting to the special working conditions of the narrow space at the bottom of the nuclear power plant cavity to the upper installation position, and fundamentally solving the technical bottlenecks of existing installation devices in terms of spatial adaptability and motion accuracy.

[0018] (3) The coordinated design of the drive and transmission ropes achieves a highly compact transmission layout through three-dimensional space optimization: the drive rope is arranged along the outside of the fixed cylinder, making full use of the external annular space; the transmission rope forms a nested force transmission channel inside the telescopic cylinders at each level, and the two form a mutually coordinated internal and external dual-path transmission system. This design transforms the traditional planar transmission structure into an efficient use of three-dimensional space, allowing the device to complete complex multi-stage motion transmission while maintaining an extremely small cross-section. It is particularly suitable for achieving long-stroke precision lifting in the narrow annular space outside the nuclear reactor.

[0019] (4) By setting limit rings at the top and bottom of each level of the cylinder, a multi-level nested limit ring system is constructed to achieve all-round motion protection for the nuclear detector installation device: the basic limit ring of the fixed cylinder establishes the safety baseline, the triple limit assembly of the first telescopic cylinder forms the main protection layer, and the progressive limit system of the second telescopic cylinder provides extended protection. The precise size matching of the limit rings at each level ensures that the device can achieve instantaneous mechanical braking in both the fully retracted and the maximum extended state. This design not only prevents the risk of overtravel, but also eliminates the cumulative error in the multi-level telescopic expansion and contraction through the hierarchical interlocking mechanism, providing an intrinsic safety guarantee for the long-term reliable operation in the high radiation environment of the nuclear power plant.

[0020] (5) The radially evenly distributed transmission rope and driving rope form a synergistic effect, and jointly construct a three-dimensional balanced force transmission network: the driving rope provides symmetrical active driving force on the outside, and the transmission rope realizes symmetrical motion transmission on the inside. The radially symmetrical arrangement of the two enables the forces at each level to pass accurately through the axis of the fixed cylinder, completely eliminating the off-load torque. This symmetrical structure ensures the stability and accuracy of the motion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the installation device for the out-of-core nuclear detector disclosed in this application; Figure 2 A top view of the installation device for the out-of-core nuclear detector disclosed in this application; Figure 3 for Figure 2 Plane section view at AA in the middle; Figure 4 for Figure 2 Plane section view at the middle BB; Figure 5 This is a schematic diagram of the telescopic cylinder disclosed in this application in the extended state from a first perspective; Figure 6 This is a schematic diagram of the telescopic cylinder disclosed in this application in the extended state from a second viewing angle; Figure 7 This is a schematic diagram of the three-dimensional structure of the drive assembly disclosed in this application; Reference numerals: 1. Fixed frame; 11. Support frame; 2. Fixed cylinder; 21. First limiting ring; 22. Second limiting ring; 211. First roller; 3. First telescopic cylinder; 31. Third limiting ring; 32. Fourth limiting ring; 33. Fifth limiting ring; 311. Second roller; 4. Second telescopic cylinder; 41. Sixth limiting ring; 42. Seventh limiting ring; 43. Eighth limiting ring; 421. Third roller; 5. Driving device; 51. Power unit Part; 52, transmission rope; 521, second guide wheel; 53, driving assembly; 531, driving wheel; 532, motor; 54, transmission assembly; 541, first guide wheel; 542, driving rope; 533, first rotating shaft; 534, second rotating shaft; 535, first tensioning roller; 536, second tensioning roller; 537, first belt; 538, second belt; 54, transmission assembly; 541, first guide wheel; 542, driving rope. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] like Figure 1 As shown, combined Figure 2-6 The embodiment of the present application discloses an installation device for an off-core nuclear detector, including a fixing frame 1, a fixing cylinder 2, a first telescopic cylinder 3, a second telescopic cylinder 4 and a driving device 5.

[0025] The fixing frame 1 serves as the supporting base of the entire device and provides a stable installation platform for other components. In this embodiment, the fixing frame 1 is fixedly installed on the ground corresponding to the bottom of the stack cavity during actual use.

[0026] The fixed cylinder 2 has one end fixed on the fixed frame 1 and the other end extending upward in the vertical direction; the internal cavity of the fixed cylinder 2 provides movement space for the first telescopic cylinder 3 and the second telescopic cylinder 4. In this embodiment, the length of the fixed cylinder 2 is less than the vertical height from the bottom of the reactor cavity to the ground, ensuring that the entire installation device can be erected at the bottom of the reactor cavity.

[0027] The first telescopic cylinder 3, as a primary telescopic unit, forms a sliding fit with the fixed cylinder 2 through a coaxial sleeve arrangement. Its structural design realizes axial movement inside the fixed cylinder 2, providing initial power transmission for subsequent multi-stage telescopic movement.

[0028] One or more second telescopic cylinders 4 are coaxially nested in descending order of outer diameter, forming a multi-stage telescopic structure. These multiple second telescopic cylinders 4 form a cascaded motion relationship, with the outermost second telescopic cylinder 4 coaxially nested within the first telescopic cylinder 3, and the innermost second telescopic cylinder 4's top end connected to a nuclear detector. This design overcomes the travel limitations of a single-stage telescopic system, enabling the device to achieve a wide range of elevation within a limited storage height, thus resolving installation challenges associated with the reactor cavity's height.

[0029] The drive unit 5 is the power source of the entire system, driving the synchronous movement of all the second telescopic cylinders 4 by controlling the movement of the first telescopic cylinder 3. The transmission method of driving force ensures the synchronous movement of the telescopic cylinders at all levels, avoiding the problem of jamming caused by asynchronous movement.

[0030] The coordinated design of the mounting frame 1, the fixed cylinder 2, and the multi-stage telescopic cylinder solves the installation challenges of nuclear detectors in confined, high-radiation environments. The device utilizes coaxially nested, multi-stage telescopic cylinders, achieving a wide range of lift and lowering capabilities while maintaining a compact storage footprint. This allows the detector to be safely and efficiently installed in a designated location above the reactor cavity. Synchronous control of the drive unit 5 ensures coordinated operation of the multi-stage telescopic mechanism. The overall design significantly reduces the risk of radiation exposure to operators and improves the safety and efficiency of nuclear power plant maintenance operations.

[0031] In order to achieve that when the first telescopic cylinder 3 is extended and retracted relative to the fixed cylinder 2, all the second telescopic cylinders 4 can be driven to extend and retract synchronously, this embodiment adopts the following technical solution to achieve this.

[0032] Specifically, the driving device 5 includes a power component 51 and several transmission ropes 52, wherein the power component 51 is used to drive the first telescopic cylinder 3 to extend and retract relative to the fixed cylinder 2. The power component 51 provides a power source for the extension and retraction of the first telescopic cylinder 3. When the first telescopic cylinder 3 moves, the transmission rope 52 is used to realize the synchronous extension and retraction of the multi-stage second telescopic cylinder 4.

[0033] In this embodiment, the number of transmission ropes 52 is determined by the number of second telescopic cylinders 4 .

[0034] When the number of the second telescopic cylinder 4 is one, a transmission rope 52 is provided, which passes around the top and bottom of the first telescopic cylinder 3 , with its two ends respectively connected to the top of the fixed cylinder 2 and the bottom of the second telescopic cylinder 4 .

[0035] In this embodiment, second guide wheels 521 are fixedly provided at the top and bottom of the first telescopic cylinder 3. In the initial state, the transmission rope 52 forms a complete circular path, with one end fixed at the top of the fixed cylinder 2 and the other end fixed at the bottom of the second telescopic cylinder 4, and the second guide wheels 521 at the top and bottom of the first telescopic cylinder 3 are passed around in the middle.

[0036] When the power assembly 51 drives the first telescopic cylinder 3 to extend upward relative to the fixed cylinder 2, the second guide wheel 521 at the top of the first telescopic cylinder 3 rises with the first telescopic cylinder 3, exerting an upward supporting force on the transmission rope 52 wrapped around it. Since the upper end of the transmission rope 52 is fixed to the top of the fixed cylinder 2, the rise of the second guide wheel 521 causes the length of the transmission rope 52 between it and the fixed point to increase. According to the pulley principle, the lower end of the transmission rope 52 must produce an equal amount of rope-retracting movement. This movement directly pulls up the second telescopic cylinder 4 through the connection point at the bottom of the transmission rope 52, so that the rising height of the second telescopic cylinder 4 is strictly equal to the rising amount of the first telescopic cylinder 3. During the entire process, the total length of the transmission rope 52 remains constant, and the displacement of the first telescopic cylinder 3 is converted one-to-one into the synchronous displacement of the second telescopic cylinder 4 through a rigid connection, thereby realizing the precise synchronous movement of the two-stage telescopic cylinders.

[0037] When the number of the second telescopic cylinders 4 is M, and M≥2, M transmission ropes 52 are provided.

[0038] Taking the two-stage second telescopic cylinder 4 as an example, two transmission ropes 52 need to be set up, among which the first transmission rope 52 passes around the top and bottom of the first telescopic cylinder 3, connecting the top of the fixed cylinder 2 and the bottom of the first-stage second telescopic cylinder 4; the second transmission rope 52 passes around the top and bottom of the first-stage second telescopic cylinder 4, connecting the top of the first telescopic cylinder 3 and the bottom of the second-stage second telescopic cylinder 4.

[0039] When two transmission ropes 52 are provided, second guide wheels 521 are provided on the top and bottom of the first telescopic cylinder 3 and the second telescopic cylinder 4 for the transmission ropes 52 to pass through.

[0040] When the first telescopic cylinder 3 is extended relative to the fixed cylinder 2, the first-stage second telescopic cylinder 4 is synchronously extended by the same displacement through the first transmission rope 52. When the first-stage second telescopic cylinder 4 rises, the second guide wheel 521 at its top begins to apply an upward thrust to the second transmission rope 52. The thrust is transmitted to the bottom of the second-stage second telescopic cylinder 4 through the second transmission rope 52, causing the second-stage second telescopic cylinder 4 to move the same displacement relative to the first-stage second telescopic cylinder 4.

[0041] It is noteworthy that the transmission ropes 52 are of uniform length. When the first telescopic cylinder 3 rises by Δh, the first-stage second telescopic cylinder 4 simultaneously rises by Δh1=Δh, and the second-stage second telescopic cylinder 4 simultaneously rises by Δh2=Δh1. The three motions strictly maintain the proportional relationship of Δh2=Δh1=Δh, thereby achieving synchronous extension and retraction of the first telescopic cylinder 3 and the multiple second telescopic cylinders 4.

[0042] Similarly, starting from the 3rd transmission rope 52, each nth transmission rope 52 passes around the top and bottom of the n-1th second telescopic cylinder 4, with the upper end connected to the top of the n-2th second telescopic cylinder 4 and the lower end connected to the bottom of the nth second telescopic cylinder 4, where n is an integer greater than or equal to 3 and less than or equal to M.

[0043] Each second guide wheel 521 converts the tension of the transmission rope 52 into a supporting force for the telescopic cylinder of the previous stage. This supporting force is proportional to the tension of the transmission rope 52, forming a force amplification transmission chain. The rise of each telescopic cylinder is limited by the displacement of the second guide wheel 521 of the previous stage. Each transmission rope 52 establishes a kinematic coupling relationship between the previous stage and the current stage, forming a recursive kinematic chain. This design ensures that no matter how many stages of telescopic cylinders there are, they maintain a completely synchronized motion state, and the relative position relationship between adjacent stages remains constant.

[0044] Notably, in the installation device disclosed in this embodiment, all telescopic cylinders deploy simultaneously, forming a fully nested structure when retracted, minimizing the total length of the device in its collapsed state (to the length of a single cylinder + a safety margin). Furthermore, synchronized telescoping allows the detector to be lifted directly from the reactor cavity bottom to the target height in a single operation, significantly reducing time. Synchronous telescoping eliminates inter-stage cumulative errors through a mechanical linkage design, enabling precise positioning of the nuclear detector.

[0045] Through the coordinated design of the multi-stage transmission rope 52 and the second guide wheel 521, a hierarchical linkage transmission structure is employed, enabling the coordinated movement of each stage of the telescopic cylinder as a single unit, achieving fully synchronized lifting and lowering motion. This design transmits the driving force step by step through the pulley system, forming a rigid motion transmission chain that ensures strict consistency in displacement at each stage. Compared to traditional step-by-step telescopic methods, this synchronous mechanism achieves a wide range of lifting and lowering travel while maintaining a compact storage size. It perfectly adapts to the unique operating conditions of nuclear power plants, from the confined space at the bottom of the reactor cavity to the upper installation location. This fundamentally addresses the technical bottlenecks of existing installation devices in terms of spatial adaptability and motion precision.

[0046] In order to realize the expansion and contraction of the first telescopic cylinder 3 relative to the fixed cylinder 2 , this embodiment shows a structural mode of the power assembly 51 . Specifically, the power assembly 51 includes a driving assembly 53 and a transmission assembly 54 .

[0047] Among them, the driving assembly 53 is arranged on the fixed frame 1, including a driving wheel 531 and a motor 532 for driving the driving wheel 531 to rotate; the transmission assembly 54 includes a first guide wheel 541 and a driving rope 542, the first guide wheel 541 is arranged at the top of the fixed cylinder 2, and the driving rope 542, the first end of which is fixedly connected to the bottom of the first telescopic cylinder 3, passes around the first guide wheel 541 and the driving wheel 531 in sequence, and the second end is fixedly connected to the bottom of the first telescopic cylinder 3.

[0048] Specifically, when the motor 532 rotates the drive wheel 531, it drives the drive rope 542 through friction transmission. Because both ends of the drive rope 542 are fixed to the first telescopic cylinder 3, the drive wheel 531 reels one end of the rope while releasing the other end, creating a pure pulling force on the first telescopic cylinder 3, achieving precise linear motion control.

[0049] In this embodiment, the drive rope 542 system focuses on providing a stable base driving force, ensuring the precise raising and lowering of the first telescopic cylinder 3 through a closed-loop transmission. The transmission rope 52 system, on the other hand, is responsible for proportionally transmitting this motion to each level of the second telescopic cylinder 4. This division of labor ensures both stable power output and precise synchronization of multi-stage motion.

[0050] The coordinated design of the drive rope 542 and transmission rope 52 achieves a highly compact transmission layout through three-dimensional spatial optimization: the drive rope 542 is routed along the exterior of the fixed cylinder 2, fully utilizing the external annular space; the transmission rope 52 forms nested force transmission channels within each level of the telescopic cylinder, forming a coordinated internal and external dual-path transmission system. This design transforms a traditional planar transmission structure into a highly efficient use of three-dimensional space, enabling the device to achieve complex multi-stage motion transmission while maintaining an extremely small cross-section. This makes it particularly suitable for achieving long-stroke precision lifting within the confined annular space surrounding nuclear reactors.

[0051] In some embodiments, a first limiting ring 21 is provided on the inner side of the top of the fixed cylinder 2, and a second limiting ring 22 is provided on the inner side of the bottom of the fixed cylinder 2. The first limiting ring 21 serves as a first safety barrier to prevent the first telescopic cylinder 3 from accidentally falling out when the device is fully retracted; the second limiting ring 22 serves as a hard stop at the lower limit of movement to ensure that the first telescopic cylinder 3 does not fall excessively. The outer diameter of the first telescopic cylinder 3 is smaller than the inner diameter of the first limiting ring 21, ensuring that the first telescopic cylinder 3 can pass through the first limiting ring 21. The first limiting ring 21 provides a sliding guide channel for the first telescopic cylinder 3, which not only ensures freedom of movement but also controls radial shaking.

[0052] A third limiting ring 31 is provided on the inner side of the top of the first telescopic cylinder 3 to prevent the outermost second telescopic cylinder 4 from accidentally falling out. A fourth limiting ring 32 is provided on the outer side of the bottom of the first telescopic cylinder 3. The outer diameter of the fourth limiting ring 32 is larger than the inner diameter of the first limiting ring 21 and the second limiting ring 22. The fourth limiting ring 32 can cooperate with the first limiting ring 21 to prevent the first telescopic cylinder 3 from accidentally falling out. A fifth limiting ring 33 is provided on the inner side of the bottom of the first telescopic cylinder 3 as a hard stop at the lower limit of movement to ensure that the outermost second telescopic cylinder 4 does not fall excessively.

[0053] The outer diameter of the second telescopic cylinder 4 is smaller than the inner diameter of the third limiting ring 31, ensuring that the second telescopic cylinder 4 can pass through the third limiting ring 31. A sixth limiting ring 41 is provided on the inner side of the top of the second telescopic cylinder 4. The sixth limiting ring 41 is used to provide a disengagement stop for the second telescopic cylinder 4 of the next level, and at the same time, provides a passage for the second telescopic cylinder 4 of the next level to pass through. In addition, it also provides an interface for connecting to the nuclear detector. A seventh limiting ring 42 and an eighth limiting ring 43 are provided on the outer side and inner side of the bottom of the second telescopic cylinder 4, respectively. The outer diameter of the seventh limiting ring 42 is larger than the inner diameter of the third limiting ring 31 and the fifth limiting ring 33. The seventh limiting ring 42 is used to cooperate with the fifth limiting ring 33 to prevent the outermost second telescopic cylinder 4 from transitioning downward. The eighth limiting ring 43 provides a downward travel stop for the second telescopic cylinder 4 of the next level (if any).

[0054] By installing limit rings at the top and bottom of each level of the cylinder, a multi-level nested limit ring system is constructed to achieve all-round motion protection for the nuclear detector installation device: the basic limit ring of the fixed cylinder 2 establishes a safety baseline, the triple limit assembly of the first telescopic cylinder 3 forms the main protective layer, and the progressive limit system of the second telescopic cylinder 4 provides extended protection. The precise dimensional coordination of the limit rings at each level ensures that the device can achieve instantaneous mechanical braking in both fully retracted and fully extended states. This design not only prevents the risk of overtravel but also eliminates the cumulative error in multi-level telescopic expansion and contraction through a hierarchical interlocking mechanism, providing an inherent safety guarantee for long-term reliable operation in the high-radiation environment of nuclear power plants.

[0055] In some embodiments, the inner circumference of the first retaining ring 21 is uniformly provided with a plurality of first rollers 211 that contact the outer wall of the first telescopic cylinder 3. These first rollers 211 convert traditional sliding friction into rolling friction, significantly reducing the resistance of the first telescopic cylinder 3 to movement relative to the fixed cylinder 2. The axial arrangement of the first rollers 211 aligns with the direction of telescopic movement, ensuring that only radial support is provided without generating additional axial resistance, making the telescopic movement smoother and more efficient.

[0056] There are several second rollers 311 evenly distributed on the inner circumference of the third limiting ring 31, which are in contact with the outer wall of the second telescopic cylinder 4. There are several third rollers 421 evenly distributed on the outer circumference of the seventh limiting ring 42, which are in contact with the inner wall of the first telescopic cylinder. The rolling direction of the first roller 211, the second roller 311 and the third roller 421 is consistent with the telescopic direction of the second telescopic cylinder 4.

[0057] This arrangement can reduce the resistance of the second telescopic cylinder 4 when it moves relative to the first telescopic cylinder 3, while ensuring the coaxiality of the second telescopic cylinder 4 when it is telescoped and extended, thereby avoiding the generation of deflection torque.

[0058] As some embodiments, the first telescopic cylinder 3 and the second telescopic cylinder 4 have equal length. When the driving device 5 is activated, the equal length structure ensures that the two-stage telescopic cylinders complete equal displacement at the same time, forming a natural synchronization mechanism. This design eliminates the problem of speed difference accumulation commonly seen in traditional multi-stage telescopic mechanisms through the inherent matching characteristics of physical dimensions.

[0059] In the fully retracted state, the bottom limit rings of the two-stage telescopic cylinders simultaneously abut against the corresponding stop surfaces; in the fully extended state, the top limit rings synchronously contact the adjacent stop surfaces. This symmetrical start-stop point design makes the force distribution more balanced, significantly improving the structural stability.

[0060] As some embodiments, the driving ropes 542 are symmetrically arranged in two, and the two driving ropes 542 are symmetrically distributed relative to the radial center of the fixed cylinder 2, forming a force balance system. This layout makes the driving force uniformly act on both sides of the first telescopic cylinder 3, effectively eliminating the eccentric moment caused by one-sided driving. The symmetrically designed driving ropes 542 automatically compensate for installation errors and uneven loads during operation, ensuring that the first telescopic cylinder 3 always moves in a straight line and avoiding the risk of jamming.

[0061] The transmission ropes 52 are symmetrically arranged inside the fixed cylinder 2, and the arrangement axis of each transmission rope 52 passes through the radial center of the fixed cylinder 2. The radial symmetric arrangement of the transmission ropes 52 achieves precise transmission of multi-stage movement through precise geometric constraints: the axes of all transmission ropes 52 converge at the center of the fixed cylinder 2, forming an equiangularly distributed force transmission channel, ensuring that the forces on the telescopic cylinders are completely balanced during movement. This symmetrical layout makes the transmission system have self-balancing characteristics, which can automatically compensate for assembly errors and uneven loads, effectively eliminating the common phenomenon of uneven load jamming in multi-stage transmission.

[0062] Through the coordinated action of the radially distributed transmission ropes 52 and the driving ropes 542, a three-dimensional balanced force transmission network is formed: the driving ropes 542 provide symmetrical driving force externally, and the transmission ropes 52 realize symmetrical movement transmission internally. The radial symmetric arrangement of the two makes the forces at each stage pass through the axis of the fixed cylinder 2 accurately, completely eliminating the eccentric moment, and this symmetrical structure ensures the stability and accuracy of the movement process.

[0063] As some embodiments, referring to FIGS. 1-2, the driving assembly 53 includes a driving motor 531, a driving pulley 532, a driving rope 542, a transmission pulley 533, a transmission rope 52, a first telescopic cylinder 3, and a second telescopic cylinder 4. Figure 6 and 7 As shown in FIGS. 1-2, the driving assembly 53 further includes a first rotating shaft 533, a second rotating shaft 534, a first tensioning roller 535, a second tensioning roller 536, a first belt 537, and a second belt 538.

[0064] The first and second rotating shafts 533 and 534 serve as the core support structure for the drive wheel 531, arranged parallel to each other on the fixed frame 1. This forms the dual-axis drive foundation and provides a stable torque output platform for the drive wheel 531. The spatially symmetrical layout of the two rotating shafts creates a mechanical response to the symmetrical distribution of the drive rope 542.

[0065] The output shaft of the motor 532 is rotationally connected to the first tensioning roller 535, and the first tensioning roller 535 and the second tensioning roller 536 are tensionedly connected to the driving rope 542 respectively. The first tensioning roller 535 and the second tensioning roller 536 are connected by a first belt 537; the first tensioning roller 535 and the first rotating shaft 533 and the second tensioning roller 536 and the second rotating shaft 534 are connected by a second belt 538 respectively.

[0066] The motor 532 drives the first tensioning roller 535 to rotate, which transmits torque to the second tensioning roller 536 via a first belt 537, causing the first and second tensioning rollers 535, 536 to rotate synchronously. The two tensioning rollers independently tighten the drive rope 542, preventing slippage of the drive rope 542. The first tensioning roller 535 and the first rotating shaft 533, as well as the second tensioning roller 536 and the second rotating shaft 534, are connected by a second belt 538. As a result, the first tensioning roller 535 and the second tensioning roller 536 transmit power to the first rotating shaft 533 and the second rotating shaft 534, respectively, via the second belt 538, causing the two drive wheels 531 to rotate synchronously, thereby driving the drive rope 542 and achieving telescopic movement of the first telescopic cylinder 3 relative to the fixed cylinder 2.

[0067] A two-stage belt drive system achieves efficient distribution and synchronous control of driving force: Motor 532 rotates the first tensioning roller 535, which in turn drives the second tensioning roller 536 via the first belt 537, ensuring balanced tension control on the drive rope 542. Simultaneously, the two tensioning rollers transmit power to their corresponding shafts via the second belt 538, driving the dual drive wheels 531 to rotate in exact synchronization. This design creates a three-stage power transmission chain: motor 532 - tensioning roller - drive wheel 531. The tensioning roller system ensures constant tension on the drive rope 542 to prevent slippage, while the symmetrical belt drive system achieves precise synchronization of the dual drive wheels 531. Ultimately, the rotational force is converted into smooth and precise linear motion of the first telescopic cylinder 3, significantly improving motion control accuracy and system durability while ensuring transmission reliability.

[0068] In this embodiment, a support frame 11 fixedly connected to the top of the fixed cylinder 2 is further provided above the fixed frame 1, which can provide fixed constraints for the upper end of the fixed cylinder 2, play a reinforcing role, and prevent the upper part of the fixed cylinder 2 from shaking.

[0069] The above description is only the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An installation device for an out-of-core nuclear detector, characterized in that: include: Fixed frame; A fixed cylinder, one end of which is fixedly mounted on a fixed frame and the other end of which extends upward in a vertical direction; The first telescopic cylinder is coaxially sleeved inside the fixed cylinder and can slide along the axial direction of the fixed cylinder; The second telescopic cylinder is provided with one or more second telescopic cylinders, and the plurality of second telescopic cylinders are coaxially sleeved in descending order of outer diameter, and the outermost second telescopic cylinder is coaxially sleeved within the first telescopic cylinder, and the top end of the innermost second telescopic cylinder is used for connecting to the nuclear detector; The driving device is used to drive the first telescopic cylinder to extend and retract relative to the fixed cylinder, and to drive all the second telescopic cylinders to extend and retract synchronously through the first telescopic cylinder.

2. The device for installing an out-of-core nuclear detector according to claim 1, wherein: The driving device includes a power assembly and a plurality of transmission ropes; A power assembly, used for driving the first telescopic cylinder to extend and retract relative to the fixed cylinder; The transmission rope is configured as follows: When the number of the second telescopic cylinder is 1, a transmission rope is provided, which passes around the top and bottom of the first telescopic cylinder, and the two ends are respectively connected to the top of the fixed cylinder and the bottom of the second telescopic cylinder; When the number of the second telescopic cylinders is M, and M ≥ 2, M transmission ropes are provided, including: The first transmission rope passes around the top and bottom of the first telescopic cylinder and connects the top of the fixed cylinder and the bottom of the first-stage second telescopic cylinder. The second transmission rope passes around the top and bottom of the first-stage second telescopic cylinder and connects the top of the first telescopic cylinder and the bottom of the second-stage second telescopic cylinder. Starting from the 3rd transmission rope, each nth transmission rope passes around the top and bottom of the n-1th second telescopic cylinder, with the upper end connected to the top of the n-2th second telescopic cylinder and the lower end connected to the bottom of the nth second telescopic cylinder, where n is an integer greater than or equal to 3 and less than or equal to M.

3. The device for installing an out-of-core nuclear detector according to claim 2, wherein: The power assembly includes a drive assembly and a transmission assembly; The driving assembly is arranged on a fixed frame and includes a driving wheel and a motor for driving the driving wheel to rotate; The transmission assembly includes a first guide wheel and a drive rope. The first guide wheel is arranged at the top of the fixed cylinder. The drive rope has a first end fixedly connected to the bottom of the first telescopic cylinder, passes around the first guide wheel and the drive wheel in sequence, and has a second end fixedly connected to the bottom of the first telescopic cylinder.

4. The device for installing an out-of-core nuclear detector according to claim 2, wherein: Second guide wheels are fixedly provided on the top and bottom of the first telescopic cylinder and the second telescopic cylinder around which the transmission rope passes.

5. The device for installing an out-of-core nuclear detector according to claim 1, wherein: A first limiting ring is provided on the inner side of the top of the fixed cylinder, and a second limiting ring is provided on the inner side of the bottom of the fixed cylinder; A third limiting ring is provided on the inner side of the top of the first telescopic cylinder, and a fourth limiting ring and a fifth limiting ring are provided on the outer side and inner side of the bottom of the first telescopic cylinder respectively. The outer diameter of the fourth limiting ring is larger than the inner diameters of the first limiting ring and the second limiting ring, and the outer diameter of the first telescopic cylinder is smaller than the inner diameter of the first limiting ring; The outer diameter of the second telescopic cylinder is smaller than the inner diameter of the third limiting ring. The sixth limiting ring is arranged on the inner side of the top of the second telescopic cylinder. The seventh limiting ring and the eighth limiting ring are arranged on the outer and inner sides of the bottom of the second telescopic cylinder respectively. The outer diameter of the seventh limiting ring is larger than the inner diameters of the third limiting ring and the fifth limiting ring.

6. The device for installing an out-of-core nuclear detector according to claim 5, wherein: A number of first rollers in contact with the outer wall of the first telescopic cylinder are evenly distributed on the inner circumference of the first limiting ring, a number of second rollers in contact with the outer wall of the second telescopic cylinder are evenly distributed on the inner circumference of the third limiting ring, and a number of third rollers in contact with the inner wall of the first telescopic cylinder are evenly distributed on the outer circumference of the seventh limiting ring. The rolling directions of the first rollers, the second rollers and the third rollers are consistent with the telescopic direction of the second telescopic cylinder.

7. The device for installing an out-of-core nuclear detector according to claim 5, wherein: The first telescopic cylinder and the second telescopic cylinder have the same length.

8. The device for installing an out-of-core nuclear detector according to claim 3, wherein: The two driving ropes are symmetrically arranged and symmetrically distributed relative to the radial center of the fixed cylinder; the transmission ropes are symmetrically arranged inside the fixed cylinder, and the arrangement axis of each transmission rope passes through the radial center of the fixed cylinder.

9. The device for installing an out-of-core nuclear detector according to claim 8, wherein: The driving assembly further includes a first rotating shaft, a second rotating shaft, a first tensioning roller, a second tensioning roller, a first belt and a second belt; The first rotating shaft, the second rotating shaft, the first tensioning roller and the second tensioning roller are arranged on the fixed frame for parallel rotation; The two driving wheels are fixedly arranged on the first rotating shaft and the second rotating shaft respectively; The output shaft of the motor is rotatably connected to the first tensioning roller, the first tensioning roller and the second tensioning roller are respectively tensionedly connected to the driving rope, and the first tensioning roller and the second tensioning roller are connected via a first belt transmission; The first tensioning roller and the first rotating shaft are connected as well as the second tensioning roller and the second rotating shaft are connected respectively via a second belt transmission.

10. The device for installing an out-of-core nuclear detector according to claim 1, wherein: A support frame fixedly connected to the top of the fixed cylinder is also provided above the fixing frame.

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