Underwater transfer device and method for transferring anti-loosening caps and support cylinders

Abstract

The application belongs to the technical field of nuclear power plant maintenance, and aims to solve the problems of difficult collection and high radiation in the transfer process of the underwater anti-loose cap and support cylinder of the nuclear power plant, and discloses an underwater transfer device and method for transferring the anti-loose cap and support cylinder, the device comprising a transfer container outer cylinder, a sleeve storage container, a nut storage container and a transfer container cover, the sleeve storage container and the nut storage container being installed in the transfer container outer cylinder, the sleeve storage container having a sleeve storage container outer cylinder body for storing the support cylinder, and the nut storage container having a nut storage container outer cylinder body for storing the anti-loose cap; the method uses the device to transfer the anti-loose cap and support cylinder underwater in the nuclear power plant. The application realizes the storage, sealing, transfer and removal of small parts underwater at a long distance, so that the operator is far away from the radiation environment to the maximum extent, and the radiation dose of the operator is greatly reduced.

Description

Technical Field

[0001] This application belongs to the field of nuclear power plant maintenance technology, and in particular relates to an underwater transfer device and method for transferring anti-loosening caps and support cylinders. Background Technology

[0002] During the long-term operation of a nuclear power plant, some equipment parts will inevitably age or be damaged. This requires maintenance personnel to repair or replace the parts, and at the same time, the parts need to be transported to analyze the cause of the damage.

[0003] Under normal operating conditions, the removal and transfer of anti-loosening caps (adjusting nuts, locking nuts) and support cylinders are relatively simple. However, due to the special nature of nuclear power plants, spatial constraints, and the high-dose, high-radiation characteristics of some equipment and devices prevent personnel from close contact and prolonged operation. Especially during reactor maintenance, some equipment has very high doses and radiation, making it impossible to expose it to air for extended periods. It must be shielded in the refueling pool. Furthermore, maintenance personnel cannot dive underwater to move damaged parts of these devices at close range. This necessitates the use of specialized storage and transfer containers above the water surface for transport.

[0004] Because the anti-loosening cap and support cylinder are located in a complex and confined underwater space and are disassembled, a special collection, storage and transfer device needs to be designed for their transfer from the reactor to the spent fuel area. Summary of the Invention

[0005] The purpose of this application is to provide an underwater transfer device and method for transferring anti-loosening caps and support cylinders, solving the problems of difficult collection and high radiation during the transfer process of underwater anti-loosening caps and support cylinders in nuclear power plants.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] In a first aspect, this application provides an underwater transfer device for transferring anti-loosening caps and support cylinders, including an outer cylinder of a transfer container, a sleeve storage container, a nut storage container, and a transfer container cover. The sleeve storage container and the nut storage container are disposed inside the outer cylinder of the transfer container. The sleeve storage container has an outer cylinder body for storing the support cylinder, and the nut storage container has an outer cylinder body for storing the anti-loosening cap. The transfer container cover is disposed on the upper part of the outer cylinder of the transfer container.

[0008] In some embodiments, a first hoisting connection seat is provided above the outer cylinder of the sleeve storage container.

[0009] In some embodiments, the inner wall of the outer cylinder of the transfer container is provided with a plurality of pin holes and grooves, through which the sleeve storage container and the nut storage container are installed.

[0010] In some embodiments, a first pin is provided on the outer wall of the sleeve storage container, and the first pin is connected to the corresponding pin hole groove.

[0011] In some embodiments, a second pin is provided on the outer wall of the outer cylinder of the nut storage container, and the second pin is connected to the corresponding pin hole groove.

[0012] In some embodiments, the inner plate of the outer cylinder of the nut storage container is connected to the second lifting connector by screws.

[0013] In some embodiments, the outer cylinder of the transfer container includes a lower cylinder body and an upper seat welded together by screws.

[0014] In some embodiments, a groove is provided above the outer cylinder of the transfer container, and the transfer container lid is engaged or disengaged from the groove by a protruding key on the outer circle to close or open the transfer container lid.

[0015] In some embodiments, the transfer container cover includes a third lifting connector and a transfer container cover plate connected by screws.

[0016] Secondly, this application provides an underwater transfer method for transferring the anti-loosening cap and the support cylinder, which is implemented using the above-mentioned device, and the method includes:

[0017] Step 1: Grab the support cylinder into the sleeve storage container, grab the first lifting connection seat, and lift the sleeve storage container into the bottom of the outer cylinder of the transfer container;

[0018] Step 2: Place the anti-loosening cap into the nut storage container, grab the second lifting connector, and lift the nut storage container above the sleeve storage container;

[0019] Step 3: Grab the third hoisting connector, fix the transfer container cover to the outer cylinder of the transfer container, and then hoist the outer cylinder of the transfer container to the transfer trolley and transport it to the fuel basket in the spent fuel area for unloading.

[0020] Step 4: During unloading, grab the third lifting connector, the second lifting connector, and the first lifting connector respectively, and lift the transfer container cover, the nut storage container, and the sleeve storage container away from the outer cylinder of the transfer container respectively.

[0021] Compared with the prior art, the underwater transfer device and method for transferring the anti-loosening cap and support cylinder provided in this application have the following advantages:

[0022] This device can be remotely closed, and after transporting small, highly irradiated parts to a designated location, it can also remotely remove the small parts from the container, reducing the risk of small parts falling off during transport.

[0023] This application enables remote underwater operation, allowing for the storage of small, high-radiation-dose components in a sealed underwater space within a nuclear power plant, and the transfer of these components from underwater within the nuclear power plant.

[0024] This application enables the storage, sealing, transfer, and retrieval of small parts underwater over long distances, allowing operators to stay as far away from the irradiation environment as possible and greatly reducing the radiation dose received by operators.

[0025] Furthermore, this device provides a storage container with the same external dimensions as spent fuel, and each storage component has its own independent space, providing a storage solution for future expansion of spent fuel pool storage. Attached Figure Description

[0026] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the technical description will be briefly introduced below.

[0027] Figure 1 A schematic diagram of the underwater transfer device for transferring the anti-loosening cap and support cylinder provided in this application;

[0028] Figure 2 A schematic diagram of the outer cylinder of the transfer container provided in this application;

[0029] Figure 3 A schematic diagram of the sleeve storage container provided in this application;

[0030] Figure 4 A schematic diagram of the nut storage container provided in this application;

[0031] Figure 5 A schematic diagram showing the connection between the nut storage container and the quick-release tool provided in this application;

[0032] Figure 6 A front view of the transfer container lid provided in this application;

[0033] Figure 7 A top view of the transfer container lid provided in this application;

[0034] Figure 8 A flowchart of an underwater transfer method for transferring anti-loosening caps and support cylinders provided in this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Outer cylinder of transfer container; 2. Sleeve storage container; 3. Nut storage container; 4. Transfer container cover; 5. Lower cylinder of outer cylinder of transfer container; 6. Upper seat welded component; 7. Outer cylinder of sleeve storage container; 8. First lifting connection seat; 9. Support cylinder; 10. Outer cylinder of nut storage container; 11. Second lifting connection seat; 12. Locking nut; 13. Adjusting nut; 15. Quick disassembly and assembly tool; 18. Third lifting connection seat; 19. Transfer container cover plate. Detailed Implementation

[0037] The following detailed description provides further details on specific implementation methods.

[0038] like Figures 1 to 7 As shown, this application provides an underwater transfer device for transferring anti-loosening caps and support cylinders, including a transfer container outer cylinder 1, a sleeve storage container 2, a nut storage container 3, and a transfer container cover 4. The sleeve storage container 2 and the nut storage container 3 are disposed inside the transfer container outer cylinder 1, and the nut storage container 3 is disposed above the sleeve storage container 2.

[0039] like Figure 2 As shown, the outer cylinder 1 of the transfer container includes a lower cylinder 5 and an upper seat welded part 6, which are fixedly connected by screws.

[0040] The outer cylinder 1 of the transfer container has four grooves on its upper part. The transfer container cover 4 is engaged or disengaged from the four grooves of the outer cylinder 1 by four protruding keys on its outer circle, which can close or open the transfer container cover 4.

[0041] The outer cylinder 1 of the transfer container houses the sleeve storage container 2 and the nut storage container 3. The inner wall of the outer cylinder 1 has several pin holes and slots, and the outer wall of the sleeve storage container 2 has a first pin, which engages with the corresponding pin hole and slot for fixation. Similarly, the outer wall of the nut storage container 3 has a second pin, which engages with the corresponding pin hole and slot for fixation. The outer cylinder 1, sleeve storage container 2, and nut storage container 3 are fixed together by the pin holes and slots and the pins (first pin and second pin), ensuring that the inner and outer containers do not rotate.

[0042] like Figure 3 and Figure 5 As shown, the sleeve storage container 2 includes a sleeve storage container outer cylinder 7 and a first lifting connection seat 8. The inner plate of the sleeve storage container outer cylinder 7 is fixed to the first lifting connection seat 8 by screws. The first lifting connection seat 8 can be connected to or disconnected from the quick disassembly tool 15, enabling the transfer of the sleeve storage container 2. A first pin is provided on the outer wall of the sleeve storage container outer cylinder 7, which mates with a pin hole groove.

[0043] like Figure 4As shown, the nut storage container 3 includes an outer cylindrical body 10, and the inner plate of the outer cylindrical body 10 is fixed to the second lifting connector 11 by screws. The second lifting connector 11 can be connected to or disconnected from the quick-release tool 15, enabling the transfer of the nut storage container 3. A second pin is provided on the outer wall of the outer cylindrical body 10, which mates with a pin hole groove.

[0044] like Figure 6 and Figure 7 As shown, the transfer container cover 4 includes a third lifting connector 18 and a transfer container cover plate 19. The transfer container cover plate 19 is fixed to the third lifting connector 18 with screws. The transfer container cover plate 19 is generally disc-shaped, with four circumferentially evenly arranged protrusions on its outer circumference. These protrusions correspond one-to-one with the grooves on the upper part of the outer cylinder 1 of the transfer container. The column of the third lifting connector 18 has two symmetrical connecting parts (e.g., lifting lugs) for lifting. The third lifting connector 18 can be connected to or disconnected from the quick-release tool 15 to realize the transfer of the transfer container cover 4.

[0045] Optionally, the first lifting connector 8, the second lifting connector 11, and the third lifting connector 18 are secured to the container using hexagon socket head cap screws.

[0046] Furthermore, based on the aforementioned device, this application also provides an underwater transfer method for transferring the anti-loosening cap and the support cylinder, such as... Figure 8 As shown, it includes the following steps:

[0047] Step 1: Grab the support cylinder 9 into the sleeve storage container 2, grab the first lifting connection seat 8, and lift the sleeve storage container 2 into the bottom of the outer cylinder 1 of the transfer container;

[0048] Step 2: Place the anti-loosening caps (locking nut 12 and adjusting nut 13) into the nut storage container 3, grab the second lifting connector 11, and lift the nut storage container 3 above the sleeve storage container 2;

[0049] Step 3: Grab the third hoisting connector 18, fix the transfer container cover 4 to the outer cylinder 1 of the transfer container, and then hoist the outer cylinder 1 of the transfer container to the transfer trolley and transport it to the fuel basket in the spent fuel area for unloading.

[0050] Step 4: During unloading, grab the third lifting connector 18, the second lifting connector 11 and the first lifting connector 8 respectively, and lift the transfer container cover 4, the nut storage container 3 and the sleeve storage container 2 away from the outer cylinder 1 of the transfer container respectively.

[0051] The specific implementation process of the above method is as follows:

[0052] (1) First, the support cylinder 9 removed from the nuclear reactor is collected in a group of two in the casing storage container 2 using a special gripping device. The first hoisting connection seat 8 is gripped by the external extension rod and the quick disassembly tool 15. The casing storage container 2 is positioned and hoisted to the bottom by the pin hole groove on the side wall of the outer cylinder 1 of the transfer container. The quick disassembly tool 15 is then removed from the first hoisting connection seat 8.

[0053] (2) Then, take out the nuclear reactor, lock nut 12 and adjusting nut 13 and put them into the nut storage container 3 in groups of 2 using a special gripping device. Grab the second hoisting connecting seat 11 with the external extension rod and quick disassembly tool 15. Position the nut storage container 3 with the side pin hole groove on the other side of the outer cylinder 1 of the transfer container and hoist it above the sleeve storage container 2. The quick disassembly tool 15 is removed from the second hoisting connecting seat 11.

[0054] (3) Finally, the third lifting connector 18 is grabbed by the external extension rod and the quick disassembly tool 15, and the transfer container cover 4 and the outer cylinder 1 of the transfer container are fixed by a key. The quick disassembly tool 15 is then disengaged from the third lifting connector 18. The outer cylinder 1 of the transfer container is then lifted to the transfer trolley by existing special tools and transported to the fuel basket in the spent fuel area for unloading.

[0055] (4) During unloading, the external extension rod and quick disassembly tool 15 grab the third lifting connection seat 18, the second lifting connection seat 11 and the first lifting connection seat 8 respectively, and lift the transfer container cover 4, the nut storage container 3 and the sleeve storage container 2 away from the outer cylinder 1 of the transfer container respectively, and conduct subsequent damage cause analysis.

[0056] The above description is only a specific embodiment of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. An underwater transfer device for transferring a make-up cap and a support cylinder, characterized by, The transport container outer cylinder (1), the sleeve storage container (2), the nut storage container (3), the transport container cover (4), the sleeve storage container (2) and the nut storage container (3) are arranged in the transport container outer cylinder (1), the sleeve storage container (2) has a sleeve storage container outer cylinder body (7) for storing a support cylinder (9), the nut storage container (3) has a nut storage container outer cylinder body (10) for storing a lock nut, the transport container cover (4) is arranged on the upper part of the transport container outer cylinder (1), the upper part of the transport container outer cylinder (1) is provided with a groove, the transport container cover (4) is matched or separated with the groove through the keys on the outer circle, and the transport container cover (4) is closed or opened.

2. The underwater transfer device for transferring a make-up cap and a support cylinder according to claim 1, wherein The upper part of the sleeve storage container outer cylinder body (7) is provided with a first lifting connecting seat (8).

3. The underwater transfer device for transferring a breakaway cap and support cylinder of claim 1, wherein, The inner side wall of the transport container outer cylinder (1) is provided with a plurality of pin hole grooves, and the sleeve storage container (2) and the nut storage container (3) are arranged through the pin hole grooves.

4. The underwater transfer device for transferring a make-up cap and a support cylinder according to claim 3, wherein The outer side wall of the sleeve storage container (2) is provided with a first pin shaft, and the first pin shaft is matched and connected with the corresponding pin hole groove.

5. The underwater transfer device for transferring a breakaway cap and support cylinder of claim 3, wherein, The outer side wall of the nut storage container outer cylinder body (10) is provided with a second pin shaft, and the second pin shaft is matched and connected with the corresponding pin hole groove.

6. The underwater transfer device for transferring a breakaway cap and support cylinder of claim 1, wherein, The inner plate of the nut storage container outer cylinder body (10) is connected with the second lifting connecting seat (11) through a screw.

7. The underwater transfer device for transferring a breakaway cap and support cylinder of claim 1, wherein, The transport container outer cylinder (1) comprises a transport container outer cylinder lower cylinder body (5) and an upper seat welding part (6) connected through a screw.

8. The underwater transfer device for transferring a breakaway cap and support cylinder of claim 1, wherein, The transport container cover (4) comprises a third lifting connecting seat (18) and a transport container cover plate (19) connected through a screw.

9. An underwater transfer method for transferring a lock nut and a support cylinder, using the underwater transfer device for transferring a lock nut and a support cylinder according to any one of claims 1 to 8, characterized by, Comprise: Step 1, the support cylinder (9) is grabbed into the sleeve storage container (2), the first lifting connecting seat (8) is grabbed, and the sleeve storage container (2) is lifted into the bottom of the transport container outer cylinder (1); Step 2, the lock nut is put into the nut storage container (3), the second lifting connecting seat (11) is grabbed, and the nut storage container (3) is lifted into the upper part of the sleeve storage container (2); Step 3, the third lifting connecting seat (18) is grabbed, the transport container cover (4) is fixed with the transport container outer cylinder (1), and the transport container outer cylinder (1) is lifted and turned to the transport trolley and then transported to the fuel basket in the spent fuel area for unloading; Step 4, when unloading, the third lifting connecting seat (18), the second lifting connecting seat (11) and the first lifting connecting seat (8) are respectively grabbed, and the transport container cover (4), the nut storage container (3) and the sleeve storage container (2) are respectively lifted away from the transport container outer cylinder (1).

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