A multi-station hoisting device for maintenance of control rod drive mechanism of high temperature gas-cooled reactor

Abstract

The present disclosure provides a multi-station hoisting device for the maintenance of a control rod drive mechanism of a high-temperature gas-cooled reactor, comprising a frame, an outer shell, a first hoisting assembly, a second hoisting assembly and a rotatable mounting plate; the outer shell is sleeved on the outer side of the frame, and a first mounting position and a second mounting position are provided on the frame, and a first hoisting assembly is selectively provided at the first mounting position, and a second hoisting assembly is selectively provided at the second mounting position; the first end of the rotatable mounting plate is connected to the frame, and the second end is used to be rotatably connected to an atmosphere isolation device, and it is also provided with a hollow position to allow the first hoisting assembly and the second hoisting assembly to be hoisted to the control rod drive mechanism under the atmosphere isolation device through the hollow position. After the atmosphere isolation device is installed once, multiple control rod drive mechanisms of any unit under the atmosphere isolation device can be hoisted and transported, and the leakage of primary helium and the diffusion of radioactive graphite dust and other substances can be effectively prevented during the hoisting process.

Description

Technical Field

[0001] The present invention belongs to the technical field of reactor maintenance, and in particular relates to a multi-station hoisting device for maintenance of a control rod drive mechanism of a high-temperature gas-cooled reactor. Background Art

[0002] During the operation of the reactor, the control rod system is used to control the reactivity and realize different modes of operation. During long-term operation, there is a need to dismantle and overhaul the control rod drive mechanism and replace electrical components. The housing of the control rod drive mechanism of the high-temperature gas-cooled reactor is part of the primary pressure boundary. Once the drive mechanism is removed, the primary pressure boundary is destroyed, resulting in the destruction of the original helium atmosphere, and there is a risk of radioactive gas release in the reactor. In addition, the primary core of the high-temperature gas-cooled reactor is composed of graphite, carbon and other structures, which are easy to absorb moisture. If more impurities are introduced into the primary system during the maintenance process, it will extend the helium purification and dehumidification period before the next start-up. Therefore, during the maintenance and hoisting process of the control rod drive mechanism of the high-temperature gas-cooled reactor, an atmosphere isolation environment needs to be established to maintain the primary atmosphere.

[0003] There are 24 groups of control rod drive mechanisms for high temperature gas-cooled reactors, which can be divided into 6 units. Each unit contains 2 groups of external drive mechanisms and 2 groups of direct drive mechanisms. The atmosphere isolation device used for external repair of the control rod drive mechanism will be installed once to seal one unit (4) of drive mechanisms for disassembly and assembly. Because the atmosphere isolation device needs to form a seal with the control rod nozzle of the pressure vessel top cover to achieve the purpose of isolating the atmosphere inside and outside the cabin. Therefore, the lifting device should meet the lifting requirements of 4 groups of drive mechanisms in one unit of the atmosphere isolation device. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provide a multi-station hoisting device for the maintenance of a control rod drive mechanism of a high temperature gas-cooled reactor.

[0005] The present invention provides a multi-station hoisting device for maintenance of a control rod drive mechanism of a high temperature gas-cooled reactor, the multi-station hoisting device comprising a frame, a shell, a first hoisting assembly, a second hoisting assembly and a rotatable mounting plate;

[0006] The outer shell is sleeved on the outer side of the frame, and a first mounting position and a second mounting position are provided on the frame. The first mounting position is selectively provided with the first hanging assembly, and the second mounting position is selectively provided with the second hanging assembly;

[0007] The first end of the rotatable mounting plate is connected to the frame, and the second end of the rotatable mounting plate is used to be connected to the atmosphere isolation device. The rotatable mounting plate is provided with a hollow position to allow the first lifting assembly and the second lifting assembly to be lifted through the hollow position to the control rod drive mechanism under the atmosphere isolation device.

[0008] In some optional embodiments, the first mounting positions are first mounting holes respectively provided on two opposite sides of the frame;

[0009] The second mounting positions are second mounting holes respectively arranged on at least one diagonal corner of the frame.

[0010] In some optional embodiments, the second mounting position is a second mounting hole respectively provided at two diagonal corners of the frame, and the second mounting holes at the two diagonal corners are selectively used to mount the second hanging assembly.

[0011] In some optional embodiments, the atmosphere isolation device is provided with a plurality of positioning sleeves, and the rotatable mounting plate is further provided with a plurality of positioning posts, and the plurality of positioning posts selectively cooperate with the plurality of positioning sleeves to achieve adjustment of the hoisting position; or,

[0012] The atmosphere isolation device is provided with a plurality of positioning columns, and the rotatable mounting plate is also provided with a plurality of positioning sleeves. The plurality of positioning columns selectively cooperate with the plurality of positioning sleeves to achieve adjustment of the hoisting position.

[0013] In some optional embodiments, the multi-station lifting device further includes a first automatic door assembly, and the first automatic door assembly is disposed between the housing and the rotatable mounting plate.

[0014] In some optional embodiments, the first hoisting assembly includes a first hoisting beam and a first electric hoist, the first hoisting beam is selectively disposed at the first installation position, and the first electric hoist is movably disposed on the first hoisting beam.

[0015] In some optional embodiments, the first lifting assembly further includes a first travel switch, and the first travel switch is disposed on the first lifting beam.

[0016] In some optional embodiments, the second lifting assembly includes a second lifting beam and a second electric hoist, the second lifting beam is selectively arranged at the second installation position, and the second electric hoist is movably arranged on the second lifting beam.

[0017] In some optional embodiments, the second lifting assembly further includes a second travel switch, and the second travel switch is disposed on the second lifting beam.

[0018] In some optional embodiments, the multi-station lifting device further includes a viewing window, and the viewing window is disposed on the frame.

[0019] The multi-station hoisting device disclosed in the present invention utilizes the first hoisting assembly, the second hoisting assembly and the rotatable mounting plate to hoist and transport multiple control rod drive mechanisms of any unit under the atmosphere isolation device after the atmosphere isolation device is installed once, thereby realizing multi-station hoisting. During the hoisting process, the leakage of primary circuit helium and the diffusion of radioactive graphite dust and other substances can be effectively prevented, and at the same time, impurity gases and foreign matter can be blocked from entering the primary circuit, thereby maintaining the purity of the primary circuit helium to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a multi-station hoisting device according to an embodiment of the present disclosure;

[0021] Figure 2 A schematic diagram of the working position of a multi-station hoisting device according to another embodiment of the present disclosure;

[0022] Figure 3 for Figure 2 Top view of the . DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] like Figures 1 to 3 As shown, this embodiment relates to a multi-station lifting device 100 for repairing a control rod drive mechanism of a high-temperature gas-cooled reactor. The multi-station lifting device 100 includes a skeleton 110, a shell 120, a first lifting assembly 130, a second lifting assembly 140 and a rotatable mounting plate 150.

[0025] For example, Figures 1 to 3 As shown, the skeleton 110 may be a three-dimensional (such as a cuboid or a cube) frame surrounded by a plurality of columns or steel pipes, and there is a hoisting space inside the frame to allow the control rod drive mechanism 300 isolated from the atmosphere by the atmosphere isolation device 200 to be hoisted by the first hoisting assembly 130 or the second hoisting assembly 140. The skeleton 110 is provided with a first installation position 111 and a second installation position 112 arranged crosswise, and the so-called crosswise arrangement means: Figure 1As shown, the first mounting position 111 can be located on two opposite sides of the frame 110, and the second mounting position is located at the diagonal of the frame 110, so that the first mounting position 111 and the second mounting position 112 are arranged crosswise. Of course, in addition to this, some other layout methods can also be adopted, which are specifically determined by the number and position of the external drive mechanism and the through drive mechanism contained in each unit.

[0026] For example, as 1 and Figure 2 As shown, a shell 120 is provided on the outer side of the skeleton 110. The shell 120 may be a skin or some other structures. The provided shell 120 can effectively prevent external impurities from entering the hoisting space, thereby ensuring the atmosphere isolation environment of the control rod drive mechanism 300.

[0027] For example, Figure 1 and Figure 3 As shown, the first hanging assembly 130 is selectively arranged at the first installation position 111. Figure 1 and Figure 3 As shown, the second hoisting assembly 140 is selectively arranged at the second installation position 112. The so-called selective arrangement means that when one of the control rod drive mechanisms 300 in a unit is hoisted, the first hoisting assembly 130 is arranged at the first installation position 111, so as to use the first hoisting assembly 130 to hoist the control rod drive mechanism 300. When another control rod drive mechanism 300 in a unit is hoisted, the first hoisting assembly 130 can be disassembled, and the second hoisting assembly 140 can be arranged at the second installation position 112, so as to use the second hoisting assembly 140 to hoist the other control rod drive mechanism 300, thereby realizing multi-station hoisting of the control rod drive mechanism.

[0028] For example, Figure 1 and Figure 2 As shown, the first end of the rotatable mounting plate 150 is connected to the frame 110, and the second end of the rotatable mounting plate 150 is used to be rotatably connected to the atmosphere isolation device 200. Through the rotatable mounting plate 150, the multi-station hoisting device 100 can have multiple different positional relationships relative to the atmosphere isolation device 200, so as to further realize the multi-station hoisting control rod drive mechanism. The rotatable mounting plate 150 is provided with a hollow position (not shown in the figure) to allow the first hoisting assembly 130 and the second hoisting assembly 140 to be hoisted to the control rod drive mechanism 300 under the atmosphere isolation device 200 through the hollow position.

[0029] The multi-station hoisting device of this embodiment utilizes the first hoisting assembly, the second hoisting assembly and the rotatable mounting plate. After the atmosphere isolation device is installed once, multiple control rod drive mechanisms of any unit under the atmosphere isolation device can be hoisted and transported to achieve multi-station hoisting. During the hoisting process, the leakage of primary circuit helium and the diffusion of radioactive graphite dust and other substances can be effectively prevented, and at the same time, impurity gases and foreign matter can be blocked from entering the primary circuit, thereby maintaining the purity of the primary circuit helium to the greatest extent.

[0030] For example, Figure 1 As shown, the first mounting position 111 is a first mounting hole respectively arranged on two opposite sides of the frame 110. The second mounting position 112 is a second mounting hole respectively arranged on two diagonal corners of the frame. Of course, the second mounting hole may be arranged only on one diagonal corner of the frame, which may be determined according to the number of control rod drive mechanisms in each unit. Figure 1 , Figure 2 and Figure 3 When suspending one of the control rod drive mechanisms 300, the second suspension assembly 140 may be installed in two second installation holes at one of the diagonal positions to suspend the control rod drive mechanism 300. When suspending another control rod drive mechanism 300, the second suspension assembly 140 may be installed in two second installation holes at another diagonal position to suspend the other control rod drive mechanism 300.

[0031] For example, Figure 2 and Figure 3 As shown, four positioning sleeves 210 are provided on the atmosphere isolation device 200. Figure 1 and Figure 3 As shown, four positioning columns 151 are also provided on the rotatable mounting plate 150, and the four positioning columns 151 selectively cooperate with the four positioning sleeves 210 to achieve the adjustment of the lifting position. That is to say, the four positioning columns 151 correspond to the four positioning sleeves 210 in different orders, so that different lifting positions can be adjusted.

[0032] In addition to the above-mentioned manner, four positioning columns may be provided on the atmosphere isolation device 200 , and correspondingly, four positioning sleeves may be provided on the rotatable mounting plate 150 , so as to also realize the adjustment of the hoisting position.

[0033] It should be noted that the number of positioning sleeves and positioning columns is not limited to the four mentioned above. Those skilled in the art can design the required lifting positions and determine the number of positioning sleeves and positioning columns based on actual lifting requirements, for example, the number of control rod drive mechanisms in a unit.

[0034] For example, Figure 1 As shown, the multi-station hoisting device 100 further includes a first automatic door assembly 160, which is disposed between the housing 120 and the rotatable mounting plate 150. The first automatic door assembly 160 is automatically opened when hoisting is required, and automatically closed after the hoisting is completed, thereby further effectively preventing the leakage of helium in the primary circuit and the diffusion of radioactive graphite dust and other substances, and at the same time preventing impurity gases and foreign matter from entering the primary circuit, thereby maintaining the purity of the helium in the primary circuit to the greatest extent.

[0035] In addition to the first automatic door assembly on the multi-station lifting device, a second automatic door assembly is also provided on the atmosphere isolation device. The principle is similar. Through the cooperation of the two, the leakage of primary helium and the diffusion of radioactive graphite dust and other substances can be further effectively prevented.

[0036] For example, Figure 1 and Figure 3 As shown, the first hoisting assembly 130 includes a first hoisting beam 131 and a first electric hoist 132. The first hoisting beam 131 is selectively arranged at first mounting holes on two opposite sides of the frame 110, and the first electric hoist 132 is movably arranged on the first hoisting beam 131. Figure 1 and Figure 3 As shown, the second lifting assembly 140 includes a second lifting beam 141 and a second electric hoist (not shown in the figure), the second lifting beam 141 is selectively arranged at a second mounting hole on one of the diagonals of the frame 110, and the second electric hoist is movably arranged on the second lifting beam 141.

[0037] In order to ensure that the hook of the electric hoist is directly above the control rod driving mechanism every time the lifting is performed, the first lifting assembly 130 further includes a first travel switch (not shown in the figure) arranged on the first lifting beam 131. The second lifting assembly 140 further includes a second travel switch (not shown in the figure) arranged on the second lifting beam 141.

[0038] It is easy to understand that, since the first hoisting beam 131 is arranged at the first mounting holes on the two opposite sides of the frame 110, and the second hoisting beam 141 is arranged at the second mounting hole on the diagonal of the frame 110, it is obvious that the length of the second hoisting beam 141 is greater than the length of the first hoisting beam 131. The first hoisting beam 131 and the second hoisting beam 141 can be used to hoist the direct-through and external drive devices respectively. Figure 3As shown, the first lifting beam 131 is arranged at the level of the frame 110, which can complete the direct lifting of the straight-through drive mechanism. When the second lifting beam 141 is installed at the diagonal mounting hole position of the frame 110, the external drive mechanism can be moved radially along the top cover for a section before lifting.

[0039] For example, Figure 1 As shown, the multi-station hoisting device 100 further includes a viewing window 170, which is disposed on the frame 110. Through the provided viewing window 170, the user can conveniently view the hoisting status in the frame.

[0040] The following will combine Figures 1 to 3 The specific working process of the embodiment of the present disclosure is described in detail:

[0041] When disassembling and overhauling the control rod drive mechanism:

[0042] 1. The multi-station hoisting device 100 is seated on the atmosphere isolation device 200 so that the positioning column 151 of the rotatable mounting plate 150 falls into the positioning sleeve 210 of the atmosphere isolation device 200 to complete the docking work, and the rotatable mounting plate 150 is fixed by the pressing block 220.

[0043] 2. Open the first automatic door assembly 160 of the multi-station hoisting device 100 and the second automatic door assembly of the atmosphere isolation device 200 respectively.

[0044] 3. Start the first electric hoist 132 of the multi-station hoisting device 100, lower the hook to a control rod drive mechanism 300 below the atmosphere isolation device 200, lift the control rod drive mechanism 300 into the multi-station hoisting device 100, and then close the first automatic door assembly 160 and the second automatic door assembly.

[0045] 4. Use the factory crane to hoist the multi-station hoisting device 100 as a whole to the control rod drive mechanism maintenance platform, open the first automatic door assembly 160, and use the first electric hoist 132 to seat the control rod drive mechanism 300 on the maintenance platform.

[0046] 5. If another control rod drive mechanism 300 needs to be hoisted and repaired, replace the hoisting beam (131 or 141) and the installation position, rotate the multi-station hoisting device 100 degrees, locate it to other installation positions on the atmosphere isolation device 200, and hoist the control rod drive mechanism according to the above steps.

[0047] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A multi-station hoisting device for maintenance of a high temperature gas-cooled reactor control rod drive mechanism, characterized in that: The multi-station hoisting device comprises a frame, a shell, a first hoisting assembly, a second hoisting assembly and a rotatable mounting plate; the frame is a three-dimensional frame surrounded by a plurality of columns; The outer shell is sleeved on the outer side of the frame, and the frame is provided with a first installation position and a second installation position which are cross-arranged, the first installation position is selectively provided with the first hanging assembly, and the second installation position is selectively provided with the second hanging assembly; The first end of the rotatable mounting plate is connected to the frame, and the second end of the rotatable mounting plate is used to be rotatably connected to the atmosphere isolation device. The rotatable mounting plate is provided with a hollow position to allow the first lifting assembly and the second lifting assembly to be lifted via the hollow position to the control rod drive mechanism under the atmosphere isolation device.

2. The multi-station lifting device according to claim 1, characterized in that: The first mounting positions are first mounting holes respectively arranged on two opposite sides of the frame; The second mounting positions are second mounting holes respectively arranged on at least one diagonal corner of the frame.

3. The multi-station lifting device according to claim 2, characterized in that: The second mounting positions are second mounting holes respectively arranged at two diagonal corners of the frame, and the second mounting holes at the two diagonal corners are selectively used to mount the second hanging assembly.

4. The multi-station lifting device according to claim 1, characterized in that: The atmosphere isolation device is provided with a plurality of positioning sleeves, and the rotatable mounting plate is further provided with a plurality of positioning posts, and the plurality of positioning posts selectively cooperate with the plurality of positioning sleeves to achieve adjustment of the hoisting position; or, The atmosphere isolation device is provided with a plurality of positioning columns, and the rotatable mounting plate is also provided with a plurality of positioning sleeves. The plurality of positioning columns selectively cooperate with the plurality of positioning sleeves to achieve adjustment of the hoisting position.

5. The multi-station lifting device according to any one of claims 1 to 4, characterized in that: The multi-station lifting device also includes a first automatic door assembly, which is arranged between the shell and the rotatable mounting plate.

6. The multi-station lifting device according to any one of claims 1 to 4, characterized in that: The first hoisting assembly includes a first hoisting beam and a first electric hoist. The first hoisting beam is selectively arranged at the first installation position, and the first electric hoist is movably arranged on the first hoisting beam.

7. The multi-station lifting device according to claim 6, characterized in that: The first hoisting assembly also includes a first travel switch, and the first travel switch is arranged on the first hoisting beam.

8. The multi-station lifting device according to any one of claims 1 to 4, characterized in that: The second hoisting assembly includes a second hoisting beam and a second electric hoist. The second hoisting beam is selectively arranged at the second installation position, and the second electric hoist is movably arranged on the second hoisting beam.

9. The multi-station lifting device according to claim 8, characterized in that: The second hoisting assembly also includes a second travel switch, and the second travel switch is arranged on the second hoisting beam.

10. The multi-station lifting device according to any one of claims 1 to 4, characterized in that: The multi-station lifting device also includes a window, which is arranged on the frame.

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