Neutron ionization chamber on-line lifting device

Abstract

The invention provides an online lifting device for a neutron ionization chamber, belongs to the technical field of nuclear power, and is used for solving the problem that the service life of the neutron ionization chamber is shortened due to neutron irradiation. The online lifting device for the neutron ionization chamber comprises a supporting part, a lifting driving part, a connecting part and a control system. The supporting part is arranged on the top of the guide pipe. The lifting driving part is arranged on the supporting part and located above the guide pipe. The connecting part is movably arranged in the guide pipe. The connecting part is used for installing the neutron ionization chamber. The connecting part is connected to the lifting driving part. And the lifting driving part can drive the connecting part to move in the guide pipe so as to drive the neutron ionization chamber to get away from or enter an active area of the reactor. The control system is connected to the lifting driving part. The lifting driving part is remotely started by the control system, and the neutron ionization chamber is lifted to leave the in-reactor active region, so that the service life of the neutron ionization chamber is prolonged, and the replacement frequency of the neutron ionization chamber is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to an online lifting device for a neutron ionization chamber. Background Art

[0002] Neutron ionization chambers are located within the reactor to measure neutron fluence levels in the active region. Once the reactor reaches a certain power level and operates stably, the neutron ionization chambers no longer need to perform measurement and monitoring tasks. However, at this point, the neutron fluence level within the reactor is high, and the long-term placement of neutron ionization chambers within the active region significantly reduces the lifespan of the detectors. Due to the high cost of neutron ionization chambers, frequent replacement increases reactor operating costs and the workload of reactor maintenance. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide an online lifting device for a neutron ionization chamber, which can lift the neutron ionization chamber away from the reactor active area after the reactor enters stable power operation, thereby reducing the neutron exposure level to the neutron ionization chamber and extending the service life of the neutron ionization chamber.

[0004] To address the above-mentioned issues, the present invention provides an online lifting device for a neutron ionization chamber, comprising: a support portion, a lifting drive portion, a connection portion, and a control system. The support portion is disposed at the top of a guide tube. The lifting drive portion is disposed on the support portion and is located above the guide tube. The connection portion is movably disposed within the guide tube. The connection portion is used to mount the neutron ionization chamber. The connection portion is connected to the lifting drive portion. The lifting drive portion is capable of driving the connection portion to move within the guide tube, thereby driving the neutron ionization chamber away from or into the active zone of the reactor. The control system is connected to the lifting drive portion.

[0005] Optionally, the support portion includes a fixing member, a support plate, and a wire harness guide rail. The fixing member is tightly clamped to the outer wall of the guide tube. The support plate is vertically mounted on the fixing member. The support plate is located on one side of the guide tube. The lifting drive unit is disposed on the support plate. The wire harness guide rail is fixedly connected to the support plate. The bottom end of the wire harness guide rail faces the end of the guide tube. The top end of the wire harness guide rail extends radially outward from the guide tube along an arc.

[0006] Optionally, the lifting drive unit includes a support cylinder, a drum, a lifting rope, and a drive motor. The support cylinder is fixed to the support unit. The drum is rotatably mounted on the end of the support cylinder away from the support unit. One end of the lifting rope is connected to the drum. The drum can be rotated to wind the lifting rope around or unwind the lifting rope from the drum. The drive motor is disposed in the support cylinder. The output end of the drive motor is connected to the drum via a speed reducer to drive the drum to rotate. A control system is connected to the drive motor.

[0007] Optionally, the lifting drive unit further includes a safety interlock. The safety interlock is connected to the drive motor and the roller. When the drive motor stops, the safety interlock locks the roller. When the drive motor is running, the safety interlock is released.

[0008] Optionally, the lifting drive unit further includes a manual transfer switch and a manual wheel. The manual transfer switch is disposed on the support cylinder. The manual transfer switch is connected to the drive motor and the safety interlock. The manual transfer switch can control the drive motor to stop and release the safety interlock. The manual wheel is connected to the drum. Turning the manual wheel can drive the drum to rotate.

[0009] Optionally, the neutron ionization chamber online lifting device further includes a height counter. The height counter is connected to the lifting drive unit. The height counter is used to measure the lifting height of the connecting portion. The control system is connected to the height counter to monitor the height position of the neutron ionization chamber in real time.

[0010] Optionally, the connecting portion includes a connecting body and a plurality of limit springs. The connecting body is cylindrical. The lifting drive unit is connected to the upper end surface of the connecting body. The lower end surface of the connecting body is provided with a threaded hole. The neutron ionization chamber is connected to the threaded hole. The limit springs are disposed on the side of the connecting body. The plurality of limit springs are spaced apart along the circumference of the connecting body.

[0011] Optionally, the neutron ionization chamber online lifting device further includes: a flange and a waterproof plug. The flange is disposed at the end of the guide tube. The waterproof plug is disposed in the inner hole of the flange to seal the end of the guide tube. The waterproof plug is provided with a through hole.

[0012] Optionally, the control system includes a host computer, a control module, and a drive module. The host computer can send control instructions to the drive module via the control module. The drive module is connected to the lifting drive unit. The drive module can drive the lifting drive unit according to the control instructions, thereby driving the neutron ionization chamber to move upward and downward.

[0013] Beneficial effects The online lifting device for the neutron ionization chamber provided by the present invention is fixed on the top of the guide tube by a support part, the lifting drive part is arranged on the support part and is located above the guide tube, the connecting part is movably arranged in the guide tube, and the neutron ionization chamber is installed on the connecting part. The lifting drive part drives the connecting part to move in the guide tube, thereby driving the neutron ionization chamber away from or into the active zone of the reactor. The control system is connected to the lifting drive part. The control system is used to control the lifting and lowering of the connecting part. When the reactor has a certain power level, the online lifting device for the neutron ionization chamber of the present invention can use the remote start-up lifting drive part of the control system to lift the neutron ionization chamber away from the active zone in the reactor, thereby increasing the service life of the neutron ionization chamber, reducing the replacement frequency of the neutron ionization chamber, reducing operating costs, reducing the amount of radioactive waste generated, and at the same time reducing the workload of reactor maintenance and reducing the exposure dose to personnel; in addition, the online lifting device for the neutron ionization chamber provided by the present invention is small in size, easy to operate, and will not interfere with other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic structural diagram of an online lifting device for a neutron ionization chamber according to an embodiment of the present invention; Figure 2 A schematic structural diagram of a support portion according to an embodiment of the present invention; Figure 3 A schematic structural diagram of a lifting drive unit according to an embodiment of the present invention; Figure 4 A schematic structural diagram of a connecting portion of an embodiment provided by the present invention; Figure 5 A schematic structural diagram of a waterproof plug according to an embodiment of the present invention; Figure 6 This is a flow chart of a control system according to an embodiment of the present invention.

[0015] The reference numerals indicate: 1. Support part; 2. Lifting drive part; 3. Connection part; 4. Control system; 5. Flange; 6. Waterproof plug; 7. Guide tube; 11. Fixing parts; 12. Support plate; 13. Wire harness guide rail; 21. Support cylinder; 22. Drum; 23. Lifting rope; 24. Drive motor; 25. Reducer; 26. Manual transfer switch; 27. Manual wheel; 31. Connecting body; 32. Threaded hole; 33. Limit spring; 41. Host computer; 42. Control module; 43. Drive module; 61. Through the hole. DETAILED DESCRIPTION

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0018] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0019] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] This embodiment provides an online lifting device for a neutron ionization chamber. Figure 1 This is a schematic structural diagram of an online lifting device for a neutron ionization chamber provided in this embodiment.

[0021] like Figure 1 As shown, the online lifting device for the neutron ionization chamber of this embodiment includes a support portion 1, a lifting drive portion 2, a connection portion 3, and a control system 4. The support portion 1 is arranged on the top of the guide tube 7. The lifting drive portion 2 is arranged on the support portion 1 and is located above the guide tube 7. The connection portion 3 is movably arranged in the guide tube 7. The connection portion 3 is used to install the neutron ionization chamber. The connection portion 3 is connected to the lifting drive portion 2. The lifting drive portion 2 can drive the connection portion 3 to move in the guide tube 7, thereby driving the neutron ionization chamber away from or into the active zone of the reactor. The control system 4 is connected to the lifting drive portion 2.

[0022] It will be appreciated that the guide tube 7 of this embodiment extends into the interior of the reactor. In the prior art, a neutron ionization chamber or other detection device can be lowered into the reactor's active zone through the guide tube 7 to measure various parameters of the active zone. If a neutron ionization chamber or other detection device is damaged by neutron irradiation, it is also removed through the guide tube 7 and disposed of harmlessly as radioactive waste.

[0023] The online neutron ionization chamber lifting device of this embodiment utilizes a support portion 1 fixed to the top of a guide tube 7. A lifting drive portion 2 is mounted on the support portion 1 and above the guide tube 7. A connecting portion 3 is movably disposed within the guide tube 7, and the neutron ionization chamber is mounted on the connecting portion 3. The lifting drive portion 2 drives the connecting portion 3 to move within the guide tube 7, thereby moving the neutron ionization chamber away from or into the reactor's active zone. A control system 4 is connected to the lifting drive portion 2. The control system controls the lifting and lowering of the connecting portion 3 by the lifting drive portion 2. When the reactor reaches a certain power level, the online neutron ionization chamber lifting device of this embodiment can remotely activate the lifting drive portion 2 using the control system 4 to lift the neutron ionization chamber away from the reactor's active zone. This increases the service life of the neutron ionization chamber, reduces the frequency of neutron ionization chamber replacement, lowers operating costs, reduces the amount of radioactive waste generated, and reduces the workload of reactor maintenance and personnel exposure. Furthermore, the online neutron ionization chamber lifting device of this embodiment is compact, easy to operate, and does not interfere with other equipment.

[0024] Figure 2 This is a schematic diagram of the structure of a support portion 1 provided in this embodiment. In some embodiments, as Figure 1 and Figure 2 As shown, the support portion 1 includes: a fixing member 11, a support plate 12, and a wire harness guide rail 13. The fixing member 11 is tightly clamped on the outer wall of the guide tube 7. The support plate 12 is vertically arranged on the fixing member 11. The support plate 12 is located on one side of the guide tube 7. The lifting drive unit 2 is arranged on the support plate 12. The wire harness guide rail 13 is fixedly connected to the support plate 12. The bottom end of the wire harness guide rail 13 faces the end of the guide tube 7. The top end of the wire harness guide rail 13 extends radially outward of the guide tube 7 along an arc.

[0025] In some examples, such as Figure 1 and Figure 2 As shown, the fixing member 11 adopts a hoop structure, which is composed of two semicircular limiting grooves interlocked with each other and connected by bolts to tightly embrace the outer wall of the guide tube 7. The fixing member 11 of this embodiment adopts a hoop structure, which has high stability and is easy to install and disassemble.

[0026] In some examples, such as Figure 1 and Figure 2As shown, the bottom of the support plate 12 is connected to the fixing member 11 and is vertically disposed on one side of the top of the guide tube 7. A mounting area is provided on the top of the support plate 12, which is approximately circular. The lifting drive unit 2 is disposed in the mounting area on the support plate 12. In this embodiment, the mounting area is provided on the top of the support plate 12, and the mounting area has a large mounting area, which facilitates the installation of the lifting drive unit 2. It will be understood that in this embodiment, the lifting drive unit 2 can be welded to the mounting area of ​​the support plate 12 or connected by bolts.

[0027] In some examples, such as Figure 1 and Figure 2 As shown, the harness guide rail 13 is connected to the support plate 12 via a support beam. The harness guide rail 13 has a guide groove extending in the same direction as the harness guide rail 13. The guide groove has a semicircular or U-shaped cross-section to ensure that there are no angles within the guide groove to prevent damage to the cables.

[0028] The support portion 1 of this embodiment includes a fixing member 11, a support plate 12, and a wire harness guide 13. The fixing member 11 and the support plate 12 cooperate to support and secure the lifting drive unit 2. The wire harness guide 13 supports and guides the connecting cables of the neutron ionization chamber. The curvature of the wire harness guide 13 prevents the cables from wearing out and bending during the lifting or lowering of the neutron ionization chamber. It should be noted that the connecting cables of the neutron ionization chamber of this embodiment are armored cables.

[0029] Figure 3 This is a schematic diagram of the structure of a lifting drive unit 2 provided in this embodiment. In some embodiments, as Figure 1 and Figure 3 As shown, the lifting drive unit 2 includes: a support cylinder 21, a roller 22, a lifting rope 23, and a drive motor 24. The support cylinder 21 is fixed to the support plate 12. The roller 22 is rotatably mounted on the end of the support cylinder 21 away from the support plate 12. One end of the lifting rope 23 is connected to the roller 22. By rotating the roller 22, the lifting rope 23 can be wound around or released from the roller 22. The drive motor 24 is disposed in the support cylinder 21. The output end of the drive motor 24 is connected to the roller 22 through a reducer 25 to drive the roller 22 to rotate. The control system 4 is connected to the drive motor 24.

[0030] For some examples, see Figure 1 The hoist rope 23 is made of steel wire rope. The steel wire rope is flexible and tough enough to meet the hoisting requirements of the neutron ionization chamber body. In addition, the steel wire rope is easy to obtain and has low cost.

[0031] The driving motor 24 of this embodiment is a servo motor, which has good precision and stability and quick response.

[0032] The lifting drive unit 2 of this embodiment includes a support tube 21, a drum 22, a lifting rope 23, and a drive motor 24. The drive motor 24 drives the drum 22 to rotate at a constant speed on the support tube 21, allowing the lifting rope 23 to be wound around the drum 22 at a constant speed or to be evenly unwound from the drum 22, thereby achieving stable lifting or lowering of the neutron ionization chamber. Furthermore, to ensure a tight seal between the support tube 21 and the drum 22, a sealing strip may be provided between the outer wall of the support tube 21 and the inner wall of the drum 22.

[0033] In some embodiments, see Figure 1 and Figure 3 The lifting drive unit 2 further includes a safety interlock. The safety interlock is connected to the drive motor 24 and the drum 22. When the drive motor 24 stops, the safety interlock locks the drum 22. When the drive motor 24 is running, the safety interlock is opened.

[0034] For some examples, see Figure 1 and Figure 3 The safety interlock includes a worm gear reducer and can realize electromagnetic braking. The electromagnetic brake is synchronized with the movement of the drive motor 24. The interlock control is turned on / off to realize that the brake is opened when the drive motor 24 moves and the brake is locked when it is not moving.

[0035] The safety interlock device of this embodiment mainly includes an operating component, a controller, an action mechanism, a transmission mechanism and an interlocking mechanism. The operating component converts the external operation signal into a signal that can be received by the controller, and usually includes buttons, switches, sensors, etc. The controller processes and judges the input signal and decides to output the control signal. The action mechanism generates an action according to the control signal to control the movement of the transmission mechanism. The transmission mechanism transmits motion and is usually composed of electromechanical transmission components. When the drive motor 24 is in a stopped state, the interlocking mechanism locks the roller 22. The working principle of the safety interlocking device is to sense the state of the drive motor 24 through a sensor, generate a control signal based on these states, and then control the roller 22 through the controller, thereby realizing the interlocking control of the drive motor 24 and the roller 22, so as to ensure the safety of the equipment.

[0036] The lifting drive unit 2 of this embodiment also includes a safety interlock, which helps to improve the safety of the device and prevent accidents.

[0037] In some embodiments, as Figure 1 and Figure 3As shown, the lift drive unit 2 also includes a manual selector switch 26 and a manual wheel 27. The manual selector switch 26 is mounted on the support tube 21. The manual selector switch 26 is connected to the drive motor 24 and the safety interlock. The manual selector switch 26 can shut down the drive motor 24 and simultaneously release the safety interlock. The manual wheel 27 is connected to the drum 22. Turning the manual wheel 27 causes the drum 22 to rotate.

[0038] The lifting drive unit 2 of this embodiment also includes a manual transfer switch 26 and a manual wheel 27, thus providing a manual operation mode. In the event of a malfunction, such as in the case of a malfunction of the drive motor 24, the manual transfer switch 26 can be used to switch to manual mode, disengaging the interlock. The manual wheel 27 then rotates the drum 22, thereby raising or lowering the neutron ionization chamber. The manual wheel 27 is then secured with a fixed chain or other fastener to stop the neutron ionization chamber at the desired height. The online neutron ionization chamber lifting device of this embodiment allows for both remote control of the neutron ionization chamber's raising or lowering via the control system 4 and manual control of the neutron ionization chamber's raising or lowering on-site.

[0039] In some embodiments, see Figure 1 and Figure 3 The neutron ionization chamber online lifting device further includes a height counter. The height counter is connected to the lifting drive unit 2 and is used to measure the lifting height of the connecting unit 3. The control system 4 is connected to the height counter to monitor the height position of the neutron ionization chamber in real time.

[0040] For some examples, see Figure 1 and Figure 3 , the height counter includes a Hall counter.

[0041] The height counter of this embodiment includes a local mechanical counter (which calculates the height by counting revolutions) and a remote programmable counter (which calculates the height by counting encoders). This counter can display the height of the neutron ionization chamber locally, and can also calculate the height of the neutron ionization chamber through remote programmable counting and display it remotely.

[0042] The neutron ionization chamber online lifting device of this embodiment further includes a height counter, which can obtain the height position of the neutron ionization chamber in real time, facilitating monitoring and control.

[0043] Figure 4 This is a schematic diagram of the structure of a connecting portion 3 provided in this embodiment. In some embodiments, as Figure 4As shown, the connecting portion 3 comprises a connecting body 31 and a plurality of limit springs 33. The connecting body 31 is cylindrical. The lifting drive unit 2 is connected to the upper end surface of the connecting body 31. The lower end surface of the connecting body 31 is provided with a threaded hole 32. The neutron ionization chamber is connected to the threaded hole 32. The limit springs 33 are arranged on the side of the connecting body 31. The plurality of limit springs 33 are spaced apart along the circumference of the connecting body 31.

[0044] In some examples, such as Figure 4 As shown, the limit spring 33 is an arched spring leaf, which has both good rebound ability and certain supporting force.

[0045] The connecting portion 3 of this embodiment includes a connecting body 31 and multiple limit springs 33. The connecting body 31 is cylindrical and a threaded hole 32 is provided on the lower end surface of the connecting body 31. The connecting body 31 is connected to the neutron ionization chamber through the threaded hole 32. When the threaded hole 32 is connected to the screw on the neutron ionization chamber, the connecting body 31 can be inserted into the mounting groove on the neutron ionization chamber. The multiple limit springs 33 are distributed at intervals along the circumference of the connecting body 31 and abut against the inner wall of the mounting groove, which can prevent the neutron ionization chamber from falling due to relative rotation between the neutron ionization chamber and the connecting portion 3.

[0046] Figure 5 This is a schematic diagram of the structure of a waterproof plug 6 provided in this embodiment. In some embodiments, as Figure 1 and Figure 5 As shown, the neutron ionization chamber online lifting device also includes a flange 5 and a waterproof plug 6. The flange 5 is disposed at the end of the guide tube 7. The waterproof plug 6 is disposed in the inner hole of the flange 5 to seal the end of the guide tube 7. The waterproof plug 6 is provided with a through hole 61.

[0047] In some examples, such as Figure 5 As shown, the waterproof plug 6 is provided with two through holes 61 for passing the cable and the lifting rope 23 respectively.

[0048] In this embodiment, flanges 5 and waterproof plugs 6 are provided at the ends of guide tube 7 to seal the guide tube 7 and prevent condensed water from leaking into the neutron ionization chamber's mounting holes, potentially degrading the chamber's insulation. The neutron ionization chamber's connecting cable and the hoist rope 23 of the in-line hoisting device can enter guide tube 6 through holes 61 in waterproof plug 6 and connect to the neutron ionization chamber and connector 3, respectively.

[0049] Figure 6 This is a flow chart of a control system 4 provided in this embodiment. In some embodiments, as Figure 6As shown, the control system 4 includes a host computer 41, a control module 42, and a drive module 43. The host computer 41 can send control instructions to the drive module 43 through the control module 42. The drive module 43 is connected to the lifting drive unit 2. The drive module 43 can drive the lifting drive unit 2 according to the control instructions, thereby driving the neutron ionization chamber to move upward and downward.

[0050] like Figure 6 As shown, the host computer 41 of this embodiment adopts a PLC control system, including a control interface and control software. The remote operator enters lifting data on the control interface and sends the data to the control software. The control software has logic processing, position control, exception handling, and data return functions. The control software can also return the acquired data to the control interface, allowing the remote operator to monitor the internal status of the reactor through the control interface. After receiving the lifting data, the control software generates a lifting instruction and sends the lifting instruction to the control module 42. The control module 42 generates a control instruction based on the lifting instruction and sends the control instruction to the drive module 43. The drive module 43 controls the lifting drive unit 2 according to the control instruction, raising the neutron ionization chamber to the desired height. The control module 42 can also collect device status information of the lifting drive unit 2 and the neutron ionization chamber through the drive module 43, and return the device status to the control software. The control software processes the device status information and sends it to the control interface for the remote operator to obtain, ultimately realizing device status monitoring on the host computer 41.

[0051] The above describes the online lifting device for the neutron ionization chamber of this embodiment. In some examples, the online lifting device for the neutron ionization chamber can meet miniaturization requirements, with a main body length of 200 mm, a height of 180 mm, a maximum lifting stroke of 1000 mm, a maximum lifting weight of 25 kg, and a lifting distance resolution of ±1 mm.

[0052] During use, when the reactor reaches a certain power level and operates stably, the control system 4 can remotely control the lifting drive unit 2 to activate, raising the neutron ionization chamber along the guide tube 7 to a preset height and away from the active zone. This reduces unnecessary neutron exposure to the neutron ionization chamber body and extends the service life of the neutron ionization chamber body. When the active zone needs to be measured again, the control system 4 can remotely control the lifting drive unit 2 to activate, lowering the neutron ionization chamber body along the guide tube 7 to a preset position and into the active zone. This flexible and easy-to-operate system not only reduces the frequency of neutron ionization chamber body replacement, lowers operating costs, and reduces the amount of radioactive waste generated, but also helps reduce reactor maintenance workload and personnel radiation dose.

[0053] According to calculations, existing neutron ionization chambers require three replacements every two years. By replacing the neutron ionization chamber online lifting device of this embodiment, based on equivalent neutron exposure levels, three replacements can be achieved every 10 years. At the current price of 800,000 RMB per chamber, this saves 9.6 million RMB every 10 years of operation. Furthermore, the reduced number of replacements reduces the amount of radioactive waste to be disposed of, resulting in excellent economic benefits.

[0054] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A neutron ionization chamber online lifting device, characterized in that: include: A support portion, disposed on the top of the guide tube; a lifting drive unit, disposed on the support unit and located above the guide tube; a connecting portion movably disposed in the guide tube; the connecting portion is used to mount the neutron ionization chamber; the connecting portion is connected to the lifting drive portion; the lifting drive portion can drive the connecting portion to move in the guide tube, thereby driving the neutron ionization chamber away from or into the active area of ​​the reactor; A control system is connected to the lifting drive unit; the control system is used to control the lifting drive unit.

2. The neutron ionization chamber online lifting device according to claim 1, characterized in that: The support portion includes: a fixing member, the fixing member being tightly clamped on the outer wall of the guide tube; A support plate is vertically arranged on the fixing member; the support plate is located on one side of the guide tube; the lifting drive unit is arranged on the support plate; A wire harness guide rail is fixedly connected to the support plate; the bottom end of the wire harness guide rail faces the end of the guide tube; and the top end of the wire harness guide rail extends along an arc toward the radial outside of the guide tube.

3. The neutron ionization chamber online lifting device according to claim 1, characterized in that: The lifting drive unit includes: A support cylinder, fixed on the support portion; A roller is rotatably sleeved on an end of the support tube away from the support portion; a lifting rope, one end of which is connected to the drum; the lifting rope can be wound around or released from the drum by rotating the drum; A driving motor is arranged in the supporting cylinder; an output end of the driving motor is connected to the roller through a reducer to drive the roller to rotate; and the control system is connected to the driving motor.

4. The neutron ionization chamber online lifting device according to claim 3, characterized in that: The lifting drive unit also includes: a safety interlock connected to the drive motor and the drum; When the driving motor stops, the safety interlock locks the drum; when the driving motor runs, the safety interlock opens.

5. The neutron ionization chamber online lifting device according to claim 4, characterized in that: The lifting drive unit also includes: A manual transfer switch is provided on the support cylinder; the manual transfer switch is connected to the drive motor and the safety interlock; the manual transfer switch can control the drive motor to stop and release the safety interlock at the same time; A manual wheel is connected to the drum; the drum can be driven to rotate by rotating the manual wheel.

6. The neutron ionization chamber online lifting device according to claim 1, characterized in that: Also includes: A height counter connected to the lifting drive unit; the height counter is used to measure the lifting height of the connecting unit; The control system is connected to the height counter to monitor the height position of the neutron ionization chamber in real time.

7. The neutron ionization chamber online lifting device according to claim 1, characterized in that: The connecting portion includes: The connecting body is cylindrical; the lifting drive part is connected to the upper end surface of the connecting body; the lower end surface of the connecting body is provided with a threaded hole; the neutron ionization chamber is connected to the threaded hole; A plurality of limit springs are arranged on the side surface of the connecting body; the plurality of limit springs are distributed at intervals along the circumference of the connecting body.

8. The neutron ionization chamber online lifting device according to claim 1, characterized in that: Also includes: a flange, disposed at an end of the guide tube; A waterproof plug is arranged in the inner hole of the flange to close the end of the guide tube; and a through hole is provided on the waterproof plug.

9. The neutron ionization chamber online lifting device according to claim 1, characterized in that: The control system includes: a host computer, a control module and a drive module; The host computer can send control instructions to the drive module through the control module; the drive module is connected to the lifting drive unit; the drive module can drive the lifting drive unit to operate according to the control instructions, thereby driving the neutron ionization chamber to move up and down.

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