Protective cover, cushion block component and installation tool assembly

Abstract

The utility model provides a protective cover, a cushion block component and an installation tool assembly, the protective cover comprises a cover body and a first limiting piece, the cover body is provided with a containing groove, and the containing groove is used for containing a flange at the end of a guide cylinder and a cotter pin arranged on the flange; and the first limiting piece is connected with the cover body, and at least one part of the first limiting piece shields the opening of the containing groove and is used for abutting against the side face, away from the groove bottom of the containing groove, of the flange, so that the cover body can shield the end face and the peripheral side face of the flange. According to the protective cover, the cover body of the protective cover shields the end face and the peripheral side face of the flange, the flange and the cotter pin arranged on the flange can be wrapped by the cover body, and therefore the protective cover can protect the flange and the cotter pin arranged on the flange, the influence of collision on the flange and the cotter pin is reduced, and the integrity of the flange and the cotter pin structure is easily kept.

Description

Technical Field

[0001] This application belongs to the field of nuclear power plant control rod guide tube installation technology, and more specifically, relates to a protective cover, pad component and installation tool assembly. Background Technology

[0002] The nuclear power plant reactor is the core equipment for realizing nuclear energy utilization, and the control rods are crucial for controlling the rate of nuclear fission reactions. They are driven by a drive mechanism, guided by a guide tube, and protected by a thermal insulation sleeve. The thermal insulation sleeve blocks heat from the reactor core and protects the drive mechanism. However, during unit operation, the upper part of the thermal insulation sleeve rubs against the flange of the drive mechanism, causing a drop in height. The longer the operating time, the more severe the drop in the position of the thermal insulation sleeve, and it may eventually fall. Therefore, it is necessary to install a pad on top of the guide tube so that the pad can directly support the thermal insulation sleeve and prevent further wear and drop. However, during the installation and replacement of the pad, the guide tube is prone to collision and wear with other components, affecting the guiding accuracy of the control rods. Utility Model Content

[0003] The purpose of this application is to provide a protective cover, a pad component, and an installation tool assembly to solve the technical problem in the prior art where the guide cylinder is easily damaged by collision during the installation of the pad.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, a protective cover is provided for a guide tube used to protect control rods in a reactor, the protective cover comprising:

[0006] The cover has a receiving groove for accommodating the flange at the end of the guide cylinder and the cotter pin disposed on the flange;

[0007] A first limiting member is connected to the cover body. At least a portion of the first limiting member blocks the opening of the receiving groove and abuts against a side of the flange away from the bottom of the receiving groove, so that the cover body can cover the end face and peripheral side of the flange.

[0008] In some embodiments, the inner wall of the receiving groove is provided with a first portion, which is used to abut against the end face of the flange so that the end face of the cotter pin is spaced from the bottom of the receiving groove.

[0009] In some embodiments, the cover has a first surface, the receiving groove is recessed from the first surface, and the first limiting member is mounted on the first surface.

[0010] In some embodiments, the protective cover further includes a first connector, the first limiting member being a limiting plate, one end of the limiting plate being rotatably connected to the cover body, and the other end of the limiting plate being detachably connected to the cover body via the first connector.

[0011] In some embodiments, the limiting plate is provided with a first mounting hole, the cover is provided with a first threaded hole, the first connector is a first bolt, and the first bolt passes through the first mounting hole and connects with the first threaded hole.

[0012] Secondly, a pad component is provided, comprising:

[0013] A pad block for connecting to a guide tube of a reactor control rod, the pad block having a second mounting hole and a second part;

[0014] The second bolt passes through the second mounting hole and is connected to the second threaded hole of the guide cylinder. The nut of the second bolt has a first recess.

[0015] A locking cup includes a tube body and a third and a fourth part disposed on the tube body. The tube body is sleeved on the outer periphery of the nut of the second bolt. The third part is sandwiched between the nut of the second bolt and the washer. The fourth part abuts against the second part. A portion of the tube body can be deformed to be inserted into the first recess to restrict the relative rotation between the second bolt and the washer.

[0016] In some embodiments, the pad is provided with a first mounting groove, the second mounting hole is provided at the bottom of the first mounting groove, the second part is the sidewall of the first mounting groove, the locking cup is provided in the first mounting groove, and the fourth part abuts against the sidewall of the first mounting groove to restrict the relative rotation between the second bolt and the pad.

[0017] Thirdly, an installation tool assembly is provided for installing the aforementioned pad component onto the top of the guide tube of a reactor control rod, the installation assembly comprising:

[0018] A protective cover, the protective cover described above, is used to be detachably connected to the guide cylinder to cover the flange at the end of the guide cylinder and the cotter pin provided on the flange;

[0019] A connecting component, the connecting component being used to install the second bolt of the pad component into the second threaded hole of the guide cylinder, and to deform a portion of the tube body of the pad component to insert into the first recess of the second bolt;

[0020] A hoisting component, which is connected to the guide tube to hoist the guide tube into or out of the pressure vessel of the reactor.

[0021] In some embodiments, the connecting component includes:

[0022] A wrench for tightening the second bolt to install the second bolt into the second threaded hole;

[0023] A stamping device includes a first body, the first body having a second mounting groove, a slidable first positioning member being provided in the second mounting groove, at least a portion of the first positioning member being slidable to extend out of the second mounting groove, a first protrusion being provided on the side wall of the second mounting groove, the first positioning member being used to abut against the nut of the second bolt, the first body being slidable relative to the first positioning member, so that the first body can be moved to be sleeved on the outer periphery of the tube body, the first protrusion being able to push against the outer side of the tube body to deform the tube body toward the center of the tube body to insert into the first recess.

[0024] In some embodiments, the stamping device further includes a first elastic element, the first positioning element being elastically connected to the first body via the first elastic element, and the first positioning element being elastically contracted by squeezing the first elastic element when moving toward the bottom wall of the second mounting groove, so that the first positioning element can extend out of the second mounting groove under the thrust of the first elastic element.

[0025] In some embodiments, the hoisting component includes a hoisting connector, the hoisting connector including a second body and a second limiting member rotatably connected to the second body, the second limiting member being rotatable relative to the second body to allow the second limiting member and the second body to be inserted into the guide channel of the guide cylinder, and the second limiting member being able to pass through the through hole of the transverse partition in the guide channel, the second limiting member also being rotatable relative to the second body to allow a portion of the second limiting member to extend out of the peripheral side of the second body in the radial direction of the second body, so that the second limiting member can abut against the bottom surface of the transverse partition, so that the hoisting component can hoist the guide cylinder.

[0026] In some embodiments, the hoisting connector further includes a control rod and a connecting rod rotatably disposed at one end of the control rod. The second body is provided with a first through hole. The control rod is slidably disposed in the first through hole. One end of the control rod away from the connecting rod is disposed outside the first through hole. The connecting rod is hinged to the second limiting member. The control rod slides relative to the second body so that the connecting rod drives the second limiting member to rotate relative to the second body.

[0027] The beneficial effects of the protective cover provided in this application are as follows: the cover body of the protective cover covers the end face and peripheral side of the flange, so that the flange and the cotter pin provided on the flange can be wrapped by the cover body, thereby enabling the protective cover to protect the flange and the cotter pin provided on the flange, reducing the impact of collision on the flange and the cotter pin, and helping to maintain the integrity of the flange and cotter pin structure; a first limiting member is provided connected to the cover body, and at least a part of the first limiting member covers the opening of the cover body receiving groove. The first limiting member can abut against the side of the flange away from the bottom of the receiving groove, so that the flange may detach from the cover body, so that the protective cover can be fixed to the end of the guide cylinder, thereby ensuring that the protective cover can always protect the flange and cotter pin at the end of the guide cylinder. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the protective cover provided in an embodiment of this application;

[0030] Figure 2 for Figure 1 The diagram shows another state of the protective cover;

[0031] Figure 3 A schematic diagram of a guide tube provided in an embodiment of this application;

[0032] Figure 4 A cross-sectional view of the assembly of the protective cover and guide cylinder provided in an embodiment of this application;

[0033] Figure 5 An assembly perspective view of the protective cover and guide tube provided in the embodiments of this application;

[0034] Figure 6 A schematic diagram of the pad provided in an embodiment of this application;

[0035] Figure 7 A schematic diagram of a locking cup provided in an embodiment of this application;

[0036] Figure 8 A schematic diagram of the second bolt provided in an embodiment of this application;

[0037] Figure 9 for Figure 8 A cross-sectional view of the second bolt shown;

[0038] Figure 10This is a schematic diagram of the assembly of the pad assembly and the guide cylinder provided in an embodiment of this application;

[0039] Figure 11 A schematic diagram of a stamping device provided in an embodiment of this application;

[0040] Figure 12 A schematic diagram of the first subject provided in an embodiment of this application;

[0041] Figure 13 This is a schematic diagram of the stamping press in use provided in the embodiments of this application;

[0042] Figure 14 A schematic diagram of the hoisting connector and the connection between the hoisting connector and the guide tube provided in the embodiments of this application;

[0043] Figure 15 for Figure 14 The diagram shows the hoisting connector and another connection state between the hoisting connector and the guide tube;

[0044] Figure 16 A schematic diagram illustrating the insertion and positioning of the positioning rod, pad, and guide cylinder provided in an embodiment of this application;

[0045] Figure 17 for Figure 16 The diagram shows a sectional view of the insertion and positioning of the positioning rod, pad, and guide cylinder.

[0046] Figure 18 This is a schematic diagram of a hanger for placing a guide cylinder at the bottom of a component pool, as provided in an embodiment of this application.

[0047] The following are the labeling elements in the figure:

[0048] 100. Guide tube; 200. Flange; 300. Cotter pin; 400. Guide channel; 500. Divider plate; 600. Hanger;

[0049] 1. Protective cover; 11. Cover body; 111. Receiving groove; 112. First part; 113. First surface; 114. First threaded hole; 12. First limiting member; 13. First connecting member;

[0050] 2. Pad; 21. Third body; 22. Support; 221. Second part; 222. First mounting groove; 223. Second mounting hole;

[0051] 3. Second bolt; 31. First recess; 32. Third mounting groove;

[0052] 4. Locking cup; 41. Tube body; 42. Third part; 43. Fourth part;

[0053] 5. Stamping device; 51. First main body; 511. Second mounting groove; 512. First protrusion; 513. Fifth part; 52. First elastic element; 53. First positioning element; 531. Sixth part;

[0054] 6. Lifting connector; 61. Second main body; 62. Second limiting component; 63. Control rod; 631. Piston; 64. Connecting rod; 65. Adjustment part; 651. First chamber; 652. Second chamber; 66. Lifting ring;

[0055] 7. Positioning rod. Detailed Implementation

[0056] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0057] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0058] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0059] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, "multiple sets" means two or more sets, "multiple pieces" means two or more pieces, and "several" means one or more, unless otherwise explicitly specified.

[0060] In nuclear power plants, the reactor, as the core equipment, bears the crucial mission of maintaining a controlled, self-sustaining chain reaction of nuclear fission, thereby achieving the efficient utilization of nuclear energy. The reactor control rods are key components within the nuclear reactor that control the rate of the nuclear fission reaction; their precise positioning is essential for the stable operation of the reactor and the safe utilization of nuclear energy. The control rods are driven by a specific control rod drive mechanism (CRDM), and guided by guide tubes that provide precise movement guidance, thus enabling flexible adjustment of the control rods' position within the reactor core.

[0061] In the initial stages of nuclear power plant startup, the number of neutrons in the reactor core is limited, making it difficult to sustain a chain reaction. At this time, by slowly raising the control rods, their absorption of neutrons is reduced, gradually increasing the number of neutrons in the core. This, in turn, initiates and maintains a stable nuclear fission chain reaction, helping the reactor smoothly reach initial criticality and achieving a smooth startup from a cold to a hot state. Furthermore, the control rods also play a role in regulating reactor power and maintaining stable reactor operation during nuclear reactor operation.

[0062] In the control rod structure, a heat-insulating sleeve is installed between the control rod guide tube and the drive mechanism. The heat-insulating sleeve can effectively block the large amount of heat generated by the reactor core from being transferred to the drive mechanism, preventing the drive mechanism from being damaged due to overheating and ensuring that the performance and service life of the drive mechanism are not affected.

[0063] However, during the actual operation of nuclear power units, due to the vibration caused by the primary circuit medium flow, frequent rubbing occurs at the joint between the upper end of the insulation sleeve and the flange of the drive mechanism. With the continuous accumulation of operating time, this rubbing causes the height of the insulation sleeve to gradually decrease. Moreover, with the increase in operating time, the wear at the end of the insulation sleeve becomes more severe, further intensifying the downward trend of the insulation sleeve. If effective intervention measures are not taken in time, the settlement distance of the insulation sleeve will continue to increase, and eventually, when the end of the insulation sleeve is completely worn away, the entire insulation sleeve is very likely to fall.

[0064] It is worth noting that the thermal insulation sleeve is a critical component related to nuclear safety. Currently, the main defect of the thermal insulation sleeve is wear and settlement. Once the thermal insulation sleeve is completely worn out, it will fall onto the guide tube of the control rods, creating a risk of rod jamming during the control rod's descent, preventing the control rods from falling smoothly. This undoubtedly poses a significant hidden danger to the safe operation of the nuclear reactor.

[0065] To ensure the safe and stable operation of a nuclear reactor, a pad is needed on top of the guide tube to reduce wear on the insulation sleeve. However, the installation process for this pad is complex and has certain drawbacks. Specifically, the guide tube must first be lifted out of the reactor's pressure vessel, and after the pad is installed, it must be lifted back into the pressure vessel. However, after the guide tube is lifted out of the pressure vessel, the flange at its end is highly susceptible to collision with other components, potentially causing the cotter pin on the flange to break. A broken cotter pin can affect the assembly accuracy of the guide tube.

[0066] Based on this, embodiments of this application provide a protective cover, a pad component, and an installation tool assembly to solve the above-mentioned problems.

[0067] Reference Figures 1 to 5 The protective cover 1 provided in this application embodiment is applied to the guide tube 100 of the control rod of the reactor. The protective cover 1 includes a cover body 11 and a first limiting member 12. The cover body 11 has a receiving groove 111 for receiving the flange 200 at the end of the guide tube 100 and the cotter pin 300 disposed on the flange 200. The first limiting member 12 is connected to the cover body 11. At least a part of the first limiting member 12 blocks the opening of the receiving groove 111 and is used to abut against the side of the flange 200 away from the bottom of the receiving groove 111, so that the cover body 11 can block the end face and peripheral side of the flange 200.

[0068] Reference Figure 3 and Figure 4 It should be noted that a flange 200 is provided at one end of the guide cylinder 100, and a cotter pin 300 is provided on the flange 200. The flange 200 can be used to fit and position with other components, and the cotter pin 300 can be used to position and fix with other components, so that the guide cylinder 100 can be fixed to the pressure vessel of the reactor. When the flange 200 and the cotter pin 300 provided on the flange 200 are worn and deformed due to impact, it will affect the installation accuracy of the guide cylinder 100, thereby affecting the movement accuracy of the control rod.

[0069] It should be noted that in some embodiments, the first limiting member 12 can be disposed on the surface of the cover 11, and the projection of the first limiting member 12 on the plane where the bottom of the receiving groove 111 is located can coincide with the bottom of the receiving groove 111. In this way, a part of the first limiting member 12 can block the opening of the receiving groove 111. In other embodiments, the first limiting member 12 can be disposed inside the receiving groove 111, and the first limiting member 12 can be connected to the side wall of the receiving groove 111. In this case, the projection of the first limiting member 12 on the plane where the bottom of the receiving groove 111 is located can coincide with the bottom of the receiving groove 111, and the first limiting member 12 as a whole can block the opening of the receiving groove 111.

[0070] In this embodiment, the cover 11 of the protective cover 1 covers the end face and peripheral side of the flange 200, allowing the flange 200 and the cotter pin 300 disposed on the flange 200 to be enclosed by the cover 11. This enables the protective cover 1 to protect the flange 200 and the cotter pin 300 disposed on the flange 200, reducing the impact of collisions on the flange 200 and the cotter pin 300, and helping to maintain the structural integrity of the flange 200 and the cotter pin 300. The first limiting member 12 is disposed on the cover 11, and at least a part of the first limiting member 12 covers the opening of the receiving groove 111 of the cover 11. The first limiting member 12 can abut against the side of the flange 200 away from the bottom of the receiving groove 111, so that the flange 200 may detach from the cover 11, allowing the protective cover 1 to be fixed to the end of the guide cylinder 100, thereby ensuring that the protective cover 1 can always protect the flange 200 and the cotter pin 300 at the end of the guide cylinder 100.

[0071] In some embodiments, the inner wall of the receiving groove 111 is provided with a first part 112, which is used to abut against the end face of the flange 200 so that the end face of the cotter pin 300 is spaced from the bottom of the receiving groove 111.

[0072] It should be noted that, referring to Figure 3 and Figure 4 The end of the cotter pin 300, which is located on the flange 200, usually protrudes from the end face of the flange 200. Thus, the part of the cotter pin 300 that protrudes from the end face of the flange 200 can be connected to other components to achieve the installation, positioning and fixing of the guide cylinder 100. Therefore, the dimensional and shape accuracy of the cotter pin 300 directly affects the positional installation accuracy of the guide cylinder 100.

[0073] A first part 112 is provided on the inner wall of the receiving groove 111. The first part 112 abuts against the end face of the flange 200. The first part 112 can limit the depth of the flange 200 inserted into the receiving groove 111, thereby making the end face of the cotter pin 300 spaced from the bottom of the receiving groove 111. In this way, the protective cover 1 and the cotter pin 300 do not directly contact each other, that is, there is no interaction force between the protective cover 1 and the cotter pin 300, and the protective cover 1 will not affect the assembly between the cotter pin 300 and the flange 200. In addition, the space between the protective cover 1 and the cotter pin 300 means that the impact force of the protective cover 1 will not be directly transmitted to the cotter pin 300, thus reducing the deformation of the cotter pin 300.

[0074] In some embodiments, the first part 112 may be an annular protrusion disposed at the bottom of the receiving groove 111, with the end face of the annular protrusion abutting against the end face of the flange 200. This can increase the contact area between the first part 112 and the flange 200. During the hoisting process, the impact force of the cover 11 can be transmitted to the flange 200 with a larger area, reducing the stress concentration of the flange 200 and thus reducing the deformation of the flange 200.

[0075] Reference Figure 1 and Figure 2 In some embodiments, the cover 11 has a first surface 113, a receiving groove 111 is recessed from the first surface 113, and a first limiting member 12 is mounted on the first surface 113.

[0076] The first limiting member 12 is installed on the first surface 113, that is, the first limiting member 12 can be located outside the receiving groove 111. This can reduce the installation difficulty of the first limiting member 12 and the cover 11, and help reduce the difficulty of installing the protective cover 1 on the flange 200.

[0077] In some embodiments, the protective cover 1 further includes a first connector 13, and the first limiting member 12 is a limiting plate. One end of the limiting plate is rotatably connected to the cover body 11, and the other end of the limiting plate is detachably connected to the cover body 11 through the first connector 13.

[0078] One end of the limiting plate is rotatably connected to the cover 11, and the other end of the limiting plate is detachably connected to the cover 11 via the first connecting piece 13. When it is necessary to install the protective cover 1 on the end of the guide cylinder 100, or to remove the protective cover 1 from the end of the guide cylinder 100, the first connecting piece 13 can be detached from the cover 11 first, and then the limiting plate can be rotated so that the limiting plate does not block the opening of the receiving groove 111. At this time, the flange 200 can pass through the opening of the receiving groove 111, which facilitates the installation and removal of the protective cover 1.

[0079] In some embodiments, the limiting plate is provided with a first mounting hole, the cover 11 is provided with a first threaded hole 114, and the first connector 13 is a first bolt, which passes through the first mounting hole and connects with the first threaded hole 114.

[0080] Using the first bolt to connect the cover 11 and the limiting plate can ensure the connection stability between the cover 11 and the limiting plate, thereby ensuring the connection stability between the protective cover 1 and the guide cylinder 100, reducing the risk of the protective cover 1 detaching from the guide cylinder 100 during hoisting, and enabling the protective cover 1 to continuously protect the flange 200 and cotter pin 300 of the guide cylinder 100; in addition, the first bolt and the first threaded hole 114 have a simple structure, which can reduce the difficulty of fixing the limiting plate and the cover 11, thereby reducing the difficulty of using the protective cover 1.

[0081] Reference Figures 6 to 10This application embodiment also provides a pad component, including a pad 2, a second bolt 3, and a locking cup 4. The pad 2 is used to connect with the guide tube 100 of the reactor control rod. The pad 2 is provided with a second mounting hole 223 and a second part 221. The second bolt 3 passes through the second mounting hole 223 and connects with the second threaded hole of the guide tube 100. The nut of the second bolt 3 is provided with a first recess 31. The locking cup 4 includes a tube body 41 and a third part 42 and a fourth part 43 provided on the tube body 41. The tube body 41 is sleeved on the outer periphery of the nut of the second bolt 3. The third part 42 is sandwiched between the nut of the second bolt 3 and the pad 2. The fourth part 43 abuts against the second part 221. A part of the tube body 41 can be deformed to be inserted into the first recess 31 to restrict the relative rotation between the second bolt 3 and the pad 2.

[0082] A locking cup 4 is provided, with its third part 42 clamped between the nut of the second bolt 3 and the washer 2. When the second bolt 3 is screwed into the second threaded hole of the guide cylinder 100, the nut of the second bolt 3 will abut against the third part 42 of the locking cup 4, thus allowing the locking cup 4 to be fixed between the nut of the second bolt 3 and the washer 2. A second part 221 is provided on the washer 2, which abuts against the fourth part 43 of the locking cup 4, thus restricting the rotation of the locking cup 4 relative to the washer 2, so that the position of the locking cup 4 relative to the washer 2 remains unchanged. A portion of the tube body 41 of the locking cup 4 is deformed for insertion. Within the first recess 31 of the nut of the second bolt 3, the tube body 41 can abut against the side wall of the first recess 31. The locking cup 4 can lock the second bolt 3 to restrict the rotation of the second bolt 3 relative to the pad 2. This can reduce the possibility of the second bolt 3 rotating and loosening under the influence of factors such as vibration, which helps to improve the connection stability between the pad 2 and the guide cylinder 100. In this way, the wear caused by the positional displacement of the pad 2 due to loosening can be reduced, which helps to reduce the number of times the pad 2 needs to be replaced. This can reduce the number of times the guide cylinder 100 needs to be hoisted when replacing the pad 2, thereby reducing the possibility of the guide cylinder 100 being damaged by impact.

[0083] In some embodiments, the nut of the second bolt 3 may be provided with multiple first recesses 31. For example, the nut of the second bolt 3 may be provided with two, three, four or even more first recesses 31. Multiple parts of the tube body 41 of the locking cup 4 may deform to be inserted into the corresponding first recesses 31 respectively, thereby improving the anti-rotation locking effect of the locking cup 4 on the second bolt 3.

[0084] Reference Figure 6In some embodiments, the pad 2 is provided with a first mounting groove 222, a second mounting hole 223 is provided at the bottom of the first mounting groove 222, a second part 221 is the side wall of the first mounting groove 222, a locking cup 4 is provided in the first mounting groove 222, and a fourth part 43 abuts against the side wall of the first mounting groove 222 to restrict the relative rotation between the second bolt 3 and the pad 2.

[0085] It should be noted that the side wall of the first mounting groove 222 can abut against the fourth part 43 to restrict the relative rotation of the second bolt 3 and the pad 2. Therefore, the cross-section of the first mounting groove 222 is not circular. Thus, when the locking cup 4 has a tendency to rotate relative to the pad 2, the side wall of the first mounting groove 222 can abut against the fourth part 43 of the locking cup 4 to restrict the rotation of the locking cup 4.

[0086] A first mounting groove 222 is provided in the pad 2, and a part of the locking cup 4 can be inserted into the first mounting groove 222. At this time, the first mounting groove 222 can serve as a positioning structure for the locking cup 4 and the pad 2, making the installation between the locking cup 4 and the pad 2 easier. When the locking cup 4 has a tendency to rotate relative to the pad 2, the side wall of the first mounting groove 222 can abut against the fourth part 43 of the locking cup 4 to restrict the rotation of the locking cup 4. At this time, the side wall of the first mounting groove 222 can serve as a limiting structure to restrict the rotation of the locking cup 4, thus ensuring the locking effect of the locking cup 4 on the second bolt 3 and ensuring the connection stability between the pad 2 and the guide cylinder 100. In addition, the side wall of the first mounting groove 222 is used as the second part 221. The second part 221 does not protrude from the surface of the pad 2, thus reducing the impact on the overall size and shape of the pad 2.

[0087] Reference Figure 6 In this embodiment, the pad 2 includes a ring-shaped third body 21 and a support portion 22 connected to the third body 21. The third body 21 may be conical, and the support portion 22 may be disposed at the large end of the third body 21. A first mounting groove 222 may be disposed on the support portion 22, which may be used to connect to the guide cylinder 100 so that the pad 2 can be fixed to the guide cylinder 100. By setting the third body 21 to be ring-shaped, the empty area in the middle of the third body 21 can provide operating space for the drive mechanism connected to the control rod. In addition, the empty area in the middle of the third body 21 can also provide flow space for the medium to ensure the normal progress of the nuclear reaction. By setting the third body 21 to be conical, the pad 2 can adapt to the flared opening of the heat jacket, so that the pad 2 can form a conical surface contact with the heat jacket to reduce the positional misalignment between the two.

[0088] In some embodiments, the pad 2 includes three support portions 22, which are evenly distributed in a ring around the central axis of the third body 21. The three support portions 22 can be fixed to the guide cylinder 100 respectively, which helps to ensure the connection strength between the pad 2 and the guide cylinder 100. In addition, the even distribution of the three support portions 22 in a ring around the central axis of the third body 21 helps to balance the force on the third body 21, thereby reducing the deformation of the pad 2.

[0089] Reference Figures 11 to 15 This application also provides an installation tool assembly for installing the pad component in any of the above embodiments onto the top of the guide tube 100 of the reactor control rod. The installation assembly includes a protective cover 1, a connecting component, and a lifting component. The protective cover 1 is the protective cover 1 in any of the above embodiments. The protective cover 1 is used to detachably connect to the guide tube 100 to cover the flange 200 at the end of the guide tube 100 and the cotter pin 300 provided on the flange 200. The connecting component is used to install the second bolt 3 of the pad component into the second threaded hole of the guide tube 100, and to deform a part of the tube body 41 of the pad component to insert into the first recess 31 of the second bolt 3. The lifting component is used to connect to the guide tube 100 to lift the guide tube 100 into or out of the reactor pressure vessel.

[0090] A protective cover 1 is provided and installed at the end of the guide cylinder 100. The protective cover 1 can cover the flange 200 at the end of the guide cylinder 100 and the cotter pin 300 provided on the flange 200, so as to reduce the possibility of deformation of the flange 200 and cotter pin 300 due to impact during the hoisting of the guide cylinder 100. The connecting component can screw the second bolt 3 of the pad component into the second threaded hole of the guide cylinder 100 to realize the installation between the pad component and the guide cylinder 100. Then, using the connecting component, a part of the tube body 41 of the pad component is deformed to be inserted into the first recess 31 of the second bolt 3, so that the locking cup 4 can lock the second bolt 3 to limit the rotation of the second bolt 3 relative to the pad 2, thus ensuring the connection stability between the pad component and the guide cylinder 100. A hoisting component is provided and used to hoist the guide cylinder 100 into or out of the reactor pressure vessel. The pad component can be installed on the guide cylinder 100 outside the pressure vessel, which can reduce the difficulty of operation and reduce the radiation dose received by the workers during the operation, thus helping to improve the safety of the operation.

[0091] In some embodiments, the connecting components include a wrench and a punch 5, the wrench being used to tighten the second bolt 3 so that the second bolt 3 is installed in the second threaded hole; see reference. Figures 11 to 13The stamping device 5 includes a first body 51, the first body 51 is provided with a second mounting groove 511, a slidable first positioning member 53 is provided in the second mounting groove 511, at least a part of the first positioning member 53 can slide to extend out of the second mounting groove 511, the side wall of the second mounting groove 511 is also provided with a first protrusion 512, the first positioning member 53 is used to abut against the nut of the second bolt 3, the first body 51 can slide relative to the first positioning member 53 so that the first body 51 can move to be sleeved on the outer periphery of the tube body 41, and the first protrusion 512 can push against the outer side of the tube body 41 so that the tube body 41 deforms toward the center of the tube body 41 to be inserted into the first recess 31.

[0092] By abutting the first positioning member 53 against the nut of the second bolt 3, the stamping 5 can be positioned against the second bolt 3, thereby reducing the positional deviation of the stamping 5 from the second bolt 3 during use. The first positioning member 53 is slidably connected to the first body 51. When the first positioning member 53 is positioned against the nut of the second bolt 3, the first body 51 can be tapped so that the first body 51 can move to the outer periphery of the tube 41. During the movement, the first protrusion 512 of the first body 51 can abut against the outer side of the tube 41 and push the tube 41 to deform it, so that a part of the tube 41 can be inserted into the first recess 31 of the nut of the second bolt 3, thus locking the second bolt 3 with the locking cup 4.

[0093] Reference Figure 8 The nut of the second bolt 3 is provided with multiple first recesses 31. In some embodiments, the second mounting groove 511 of the stamper 5 may be provided with a first protrusion 512. In this case, when using the stamper 5 to lock the locking cup 4 and the second bolt 3, the first protrusion 512 needs to be deformed by pushing against the tube body 41 so that it is inserted into one of the first recesses 31. Then, the first body 51 is rotated by a corresponding angle so that the first protrusion 512 pushes against another part of the tube body 41 so that it is inserted into another first recess 31. This process is repeated. The operation continues until the tube body 41 is inserted into all the first recesses 31; in other embodiments, the second mounting groove 511 of the stamper 5 may be provided with a plurality of first protrusions 512. When the stamper 5 is used to lock the locking cup 4 and the second bolt 3, the plurality of first protrusions 512 are aligned with the plurality of first recesses 31 one by one. When the second body 61 of the stamper 5 is struck, all the first protrusions 512 can simultaneously push the tube body 41 to deform, so that multiple parts of the tube body 41 can be simultaneously inserted into the plurality of first recesses 31.

[0094] Continue to refer to Figure 11In some embodiments, the stamper 5 further includes a first elastic element 52, and a first positioning element 53 is elastically connected to the first body 51 through the first elastic element 52. When the first positioning element 53 moves toward the bottom wall of the second mounting groove 511, it squeezes the first elastic element 52 to elastically contract, so that the first positioning element 53 can extend out of the second mounting groove 511 under the thrust of the first elastic element 52.

[0095] The first body 51 and the first positioning member 53 are connected by the first elastic member 52. After the tube 41 is deformed by striking the first body 51 of the stamper 5, the first body 51 can move toward the side away from the second bolt 3 under the elastic thrust of the first elastic member 52, so that the first body 51 can be separated from the tube 41 of the locking cup 4, thus making it easy to remove the stamper 5.

[0096] In some embodiments, the first elastic element 52 may be a spring, an elastic block, etc.

[0097] In some embodiments, a fifth part 513 is further provided in the second mounting groove 511 of the first body 51, and a sixth part 531 is provided at the end of the first positioning member 53 connected to the first elastic member 52. The sixth part 531 is located between the fifth part 513 and the bottom of the second mounting groove 511. The side of the sixth part 531 facing the opening of the second mounting groove 511 abuts against the fifth part 513. This can limit the movement range of the first positioning member 53. A part of the first positioning member 53 can be used in the second mounting groove 511, which can reduce the probability of the first positioning member 53 detaching from the first body 51.

[0098] Reference Figure 8 In some embodiments, the nut of the second bolt 3 is provided with a third mounting groove 32, which allows a wrench to be inserted to install the second bolt 3 into the second threaded hole; when using the stamper 5, the first positioning member 53 of the stamper 5 can be inserted into the third mounting groove 32 to realize the insertion and positioning of the stamper 5 and the second bolt 3.

[0099] In this embodiment, the wrench can be a torque wrench. A torque wrench can precisely control the torque applied to bolts, nuts, and other connecting parts. When tightening a bolt or nut using a torque wrench, the force applied by the operator will cause the wrench to generate torque. This torque is measured and converted by an internal mechanical structure or electronic sensor. When a preset torque value is reached, the user will be alerted in a specific way. In some embodiments, the torque value of the torque wrench can be set to 13 daNm.

[0100] Reference Figure 14 and Figure 15 In some embodiments, the hoisting component includes a hoisting connector 6, which includes a second body 61 and a second limiting member 62 rotatably connected to the second body 61, as shown in the figure. Figure 14 (a) and Figure 14 (b) The second limiting member 62 is rotatable relative to the second body 61 such that the second limiting member 62 and the second body 61 are inserted into the guide channel 400 of the guide cylinder 100, and the second limiting member 62 is able to pass through the through hole of the transverse partition 500 in the guide channel 400, as shown in reference. Figure 15 (a) and Figure 15 (b) The second limiting member 62 can also be rotated relative to the second body 61 so that a portion of the second limiting member 62 can extend out of the circumferential side of the second body 61 in the radial direction of the second body 61, so that the second limiting member 62 can abut against the bottom surface of the diaphragm 500, so that the lifting component can lift the guide cylinder 100.

[0101] It should be noted that the bottom surface of the diaphragm 500 refers to the side of the guide cylinder 100 facing downwards when in use.

[0102] A rotatable second limiting member 62 is provided on the second main body 61. When the second limiting member 62 rotates relative to the second main body 61, a part of the second limiting member 62 can extend out of the circumferential side of the second main body 61 in the radial direction, or the second limiting member 62 can not extend out of the circumferential side of the second main body 61. In this way, the rotation of the second limiting member 62 relative to the second main body 61 is equivalent to changing the radial dimension of the hoisting connector 6. The hoisting connector 6 can be used in conjunction with the transverse partition 500 in the guide cylinder 100 to realize the fixing and disassembly of the hoisting connector 6 and the guide cylinder 100, thereby facilitating hoisting operations.

[0103] In some embodiments, the hoisting connector 6 further includes a control rod 63 and a connecting rod 64 rotatably disposed at one end of the control rod 63. The second body 61 is provided with a first through hole, the control rod 63 is slidably disposed in the first through hole, and the end of the control rod 63 facing away from the connecting rod 64 is disposed outside the first through hole. The connecting rod 64 is hinged to the second limiting member 62, and the control rod 63 slides relative to the second body 61 so that the connecting rod 64 drives the second limiting member 62 to rotate relative to the second body 61.

[0104] A control rod 63 and a connecting rod 64 rotatably mounted on the control rod 63 are provided. The connecting rod 64 is hinged to the second limiting member 62, and the end of the control rod 63 facing away from the connecting rod 64 is located outside the first through hole. Therefore, the control rod 63 can be driven to move relative to the first body 51 by pushing or pulling the end of the control rod 63, so that the second limiting member 62 can rotate synchronously relative to the first body 51. This facilitates the adjustment of the position of the second limiting member 62, and facilitates the fixing and disassembly of the hoisting connector 6 and the guide cylinder 100, thereby facilitating hoisting operations.

[0105] In this embodiment, when the control lever 63 is pulled outward, the second limiting member 62 can be driven to rotate relative to the second body 61, so that the second limiting member 62 extends out of the circumferential side of the second body 61 in the radial direction. When the control lever 63 is pushed inward, the second limiting member 62 can be driven to rotate toward the center of the second body 61, so that the second limiting member 62 does not protrude out of the circumferential side of the second body 61 in the radial direction.

[0106] In some embodiments, two length sizes of the lifting connector 6 can be provided to meet the lifting needs of different scenarios.

[0107] In some embodiments, the lifting component may also include a crane, and a lifting ring 66 may be provided at the end of the control rod 63 of the lifting connector 6 away from the connecting rod 64. The lifting ring 66 may be hung on the hook of the crane so that the crane can be connected to the guide cylinder 100 through the lifting connector 6.

[0108] In some embodiments, the hoisting connector 6 further includes an adjustment part 65 disposed on the second main body 61. The adjustment part 65 has an installation cavity. One end of the control rod 63 away from the second limiting member 62 passes through the installation cavity. A sealing ring is disposed between the control rod 63 and the opening of the installation cavity to achieve a dynamic seal between the control rod 63 and the adjustment part 65. A piston 631 is disposed around the periphery of the control rod 63. The piston 631 abuts against the inner wall of the installation cavity and divides the installation cavity into a first chamber 651 and a second chamber 652. The second chamber 652 is located on the side of the first chamber 651 facing the second main body 61. The adjustment part 65 is also provided with a first interface communicating with the first chamber 651 and a second interface communicating with the second chamber 652. The second interface connected to chamber 652 is connected to the first interface and the second interface are respectively connected to the air pump. When air is supplied to the first chamber 651 and air is drawn from the second chamber 652, the piston 631 moves under the push of the air pressure to squeeze the second chamber 652. The movement of the piston 631 can push the control rod 63 to move, so that the second limiting member 62 can rotate to not protrude from the circumferential side of the second body 61. When air is drawn from the first chamber 651 and supplied to the second chamber 652, the piston 631 moves under the push of the air pressure to squeeze the first chamber 651. The movement of the piston 631 can pull the control rod 63 to move, so that the second limiting member 62 can rotate to extend from the circumferential side of the second body 61.

[0109] In related technologies, during the installation of pads on the top of the guide tube, the installation position of the pads is not easy to be aligned. After installation, the pad components are prone to collision and wear with the control rods, which affects the guiding accuracy of the control rods and thus has an adverse effect on the operational stability and safety of the nuclear reactor.

[0110] Therefore, refer to Figure 16 and Figure 17In some embodiments, the connecting component also includes a positioning rod 7, which can pass through the empty area in the middle of the third body 21 of the pad 2 and be inserted into the guide channel 400 of the guide cylinder 100. The positioning rod 7 can act as a positioning tool for the pad 2 and the guide cylinder 100, thereby improving the coaxiality of the pad 2 and the guide cylinder 100 and improving the assembly accuracy of the two.

[0111] This application also provides a method for installing a pad component, providing the pad component and installation tool assembly from any of the above embodiments, including the following steps:

[0112] S01. Place the guide tube 100 horizontally at the side of the reactor pool 20m from the reactor building of the nuclear power plant.

[0113] S02. Install a protective cover 1 at the end of the guide cylinder 100 so that the protective cover 1 can cover the flange 200 and cotter pin 300 at the end of the guide cylinder 100.

[0114] S03, Record the coding and identification of the guide cylinder 100 and the pad block 2;

[0115] S04. Apply grease evenly to the second bolt 3 and wait for a preset time to allow the grease to dry; the preset time can be no less than 5 minutes.

[0116] S05. Use the positioning rod 7 to penetrate the empty area in the middle of the pad 2, and insert the positioning rod 7 into the guide channel 400 of the guide cylinder 100 so that the pad 2 and the guide cylinder 100 are positioned.

[0117] S06. Insert the locking cup 4 into the first mounting groove 222 of the pad block 2;

[0118] S07. Pass the second bolt 3 through the second mounting holes 223 of the locking cup 4 and the pad 2 in sequence, and use a wrench to screw the second bolt 3 into the second threaded hole of the guide cylinder 100.

[0119] S08. Insert the first positioning part 53 of the stamping 5 into the third mounting groove 32 of the nut of the second bolt 3 so that the stamping 5 is inserted and positioned with the second bolt 3.

[0120] S09. Use a hammer to strike the first body 51 of the stamping 5. The first body 51 can move relative to the first positioning member 53 so that the first protrusion 512 pushes against the tube 41 of the locking cup 4 so that the tube 41 deforms and inserts into the first recess 31 of the nut of the second bolt 3.

[0121] S10. Check the locking of the locking cup 4 to the second bolt 3, and check the quality of the locking cup 4. If the locking cup 4 is cracked, it needs to be replaced.

[0122] S11. Pass the hoisting connector 6 through the empty area in the middle of the pad block 2 and insert it into the guide channel 400 of the guide cylinder 100, so that the second limiting member 62 of the hoisting connector 6 passes through the through hole of the transverse partition 500 in the guide channel 400, and then rotate the second limiting member 62 relative to the second body 61 so that the second limiting member 62 can abut against the bottom surface of the transverse partition 500.

[0123] S12. Connect the lifting ring 66 of the shorter lifting connector 6 to the hook of the crane to lift the guide cylinder 100 from the horizontal position to the vertical position.

[0124] S13. Remove the protective cover 1 installed at the end of the guide cylinder 100;

[0125] S14. Hoist the guide tube 100 into the reactor pool and place it on the hanger 600 beside the pool (refer to...). Figure 18 );

[0126] S15. Separate the shorter hoisting connector 6 from the guide cylinder 100;

[0127] S16. Connect the longer hoisting connector 6 to the guide cylinder 100, and connect the lifting ring 66 of the longer hoisting connector 6 to the hook of the crane.

[0128] S17. Hoist the guide cylinder 100 into the component pool and place the guide cylinder 100 on the hanger 600 at the bottom of the component pool;

[0129] S18. Separate the longer hoisting connector 6 from the guide cylinder 100.

[0130] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protective cover characterized in that, A protective cover for a guide tube of a control rod of a nuclear reactor, the protective cover comprising: a cover body having a receiving groove for receiving a flange of an end portion of the guide tube and a split pin provided on the flange; a first limiting member connected to the cover body, at least a portion of the first limiting member shielding an opening of the receiving groove and abutting against a side of the flange away from a bottom of the receiving groove, so that the cover body can shield an end surface and a peripheral surface of the flange.

2. The boot of claim 1, wherein, An inner wall of the receiving groove is provided with a first portion for abutting against the end surface of the flange, so that an end surface of the split pin is spaced apart from the bottom of the receiving groove.

3. A protective cover according to claim 1 or 2, characterised in that The cover body has a first surface from which the receiving groove is recessed, and the first limiting member is mounted on the first surface.

4. The boot of claim 3, wherein, The protective cover further comprises a first connecting member, and the first limiting member is a limiting plate, one end of the limiting plate is rotatably connected to the cover body, and the other end of the limiting plate is detachably connected to the cover body via the first connecting member.

5. The boot of claim 4, wherein, The limiting plate is provided with a first mounting hole, the cover body is provided with a first threaded hole, and the first connecting member is a first bolt, the first bolt penetrates through the first mounting hole and is connected to the first threaded hole.

6. A spacer member, characterized by Comprising: a spacer for being connected to a guide tube of a control rod of a nuclear reactor, the spacer being provided with a second mounting hole and further provided with a second portion; a second bolt penetrating through the second mounting hole and being connected to a second threaded hole of the guide tube, a nut of the second bolt being provided with a first recess; a locking cup comprising a tube body and a third portion and a fourth portion provided on the tube body, the tube body being sleeved on an outer periphery of the nut of the second bolt, the third portion being clamped between the nut of the second bolt and the spacer, the fourth portion abutting against the second portion, and a portion of the tube body being deformable to be inserted into the first recess to limit relative rotation of the second bolt and the spacer.

7. The spacer member of claim 6, wherein The spacer is provided with a first mounting groove, the second mounting hole is provided on a bottom of the first mounting groove, the second portion is a side wall of the first mounting groove, the locking cup is provided in the first mounting groove, and the fourth portion abuts against the side wall of the first mounting groove to limit relative rotation of the second bolt and the spacer.

8. A mounting tool assembly characterized by, An installation assembly for installing the spacer component of claim 6 or 7 on a top of a guide tube of a control rod of a nuclear reactor, the installation assembly comprising: a protective cover according to any one of claims 1 to 5, the protective cover being detachably connected to the guide tube to shield a flange of an end portion of the guide tube and a split pin provided on the flange; a connecting component for installing the second bolt of the spacer component into the second threaded hole of the guide tube and for deforming a portion of the tube body of the spacer component to be inserted into the first recess of the second bolt; a hoisting component for being connected to the guide tube to hoist the guide tube into or out of a pressure vessel of the nuclear reactor.

9. The mounting tool assembly of claim 8, wherein, The connecting component comprises: A wrench is used to screw the second bolt so as to be installed in the second threaded hole; The punch further comprises a first elastic member, the first positioning member is elastically connected with the first main body through the first elastic member, and the first positioning member is elastically contracted by extruding the first elastic member when moving towards the bottom wall of the second mounting groove, so that the first positioning member can extend out of the second mounting groove under the thrust of the first elastic member.

10. The mounting tool assembly of claim 9, wherein, The hoisting component comprises a hoisting connecting piece, the hoisting connecting piece comprises a second main body and a second limiting piece rotationally connected with the second main body, the second limiting piece can rotate relative to the second main body to be inserted into the guide channel of the guide cylinder, and the second limiting piece can pass through the through hole of the transverse partition plate in the guide channel, and the second limiting piece can also rotate relative to the second main body to make a part of the second limiting piece extend out of the circumferential surface of the second main body in the radial direction of the second main body, so that the second limiting piece can abut against the bottom surface of the transverse partition plate, and the hoisting component can hoist the guide cylinder.

11. The mounting tool assembly of any of claims 8-10, wherein, The hoisting connecting piece further comprises a control rod and a connecting rod rotationally arranged at one end of the control rod, the second main body is provided with a first through hole, the control rod is slidingly arranged in the first through hole, one end of the control rod away from the connecting rod is arranged outside the first through hole, the connecting rod is hinged with the second limiting piece, and the control rod slides relative to the second main body to drive the connecting rod to rotate the second limiting piece relative to the second main body.

12. The mounting tool assembly of claim 11, wherein, ​

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