Nuclear power plant reactor pad installation tool

Abstract

This application provides a nuclear power plant reactor pad installation tool, including an operating rod with a first end and a second end arranged opposite to each other; a locking unit disposed at the first end and used to connect with the pad, the locking unit having a locked state and an unlocked state; an indicating unit disposed on the outer periphery of the operating rod and located on the side of the locking unit facing the second end, the indicating unit being connected to the locking unit and the pad and used to indicate the positional relationship between the locking unit and the pad, when the locking unit is in the locked state, the indicating unit is in a first indicating state, and when the locking unit switches from the locked state to the unlocked state, the indicating unit simultaneously switches from the first indicating state to the second indicating state. The indicating unit can indicate the connection state between the locking unit and the pad, which helps to improve the efficiency of the operation; placing the indicating unit on the outer periphery of the operating rod and on the side of the locking unit facing the second end allows the indicating unit to effectively indicate the connection state between the locking unit and the pad.

Description

Technical Field

[0001] This application belongs to the technical field of pad installation on the top of the reactor guide tube of a nuclear power plant, and more specifically, it relates to a tool for installing pads on a nuclear power plant reactor. Background Technology

[0002] The nuclear power plant reactor is the core equipment for realizing nuclear energy utilization. Control rods are crucial for controlling the rate of nuclear fission reactions. They are driven by specific drive mechanisms and guided precisely by guide tubes. A heat shield is installed between the guide tube and the drive mechanism to block heat from the reactor core and protect the drive mechanism. However, during unit operation, the upper flange of the heat shield collides and wears against the drive mechanism's mounting point, causing the heat shield to drop. The longer the operating time, the more severe the drop, potentially leading to its collapse. Therefore, it is necessary to install pads on top of the guide tube to support the heat shield and reduce its settlement. However, the current installation efficiency of these pads is relatively low. Utility Model Content

[0003] The purpose of this application is to provide a nuclear power plant reactor block installation tool to improve the efficiency of block installation.

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

[0005] A tool for installing reactor spacers in a nuclear power plant is provided, comprising:

[0006] An operating lever having a first end and a second end disposed opposite to each other;

[0007] A locking unit is disposed at the first end and used to connect with the pad block. The locking unit has a locked state and an unlocked state. When the locking unit is in the locked state, the locking unit can lock the pad block to fix the pad block to the nuclear power plant reactor pad block installation tool. When the locking unit switches from the locked state to the unlocked state, the pad block can be separated from the nuclear power plant reactor pad block installation tool.

[0008] An indicator unit is disposed on the outer periphery of the operating lever and located on the side of the locking unit facing the second end. The indicator unit is connected to the locking unit and the pad and is used to indicate the positional relationship between the locking unit and the pad. The indicator unit has a first indicator state and a second indicator state. When the locking unit is in the locked state, the indicator unit is in the first indicator state. When the locking unit switches from the locked state to the unlocked state, the indicator unit simultaneously switches from the first indicator state to the second indicator state.

[0009] In some embodiments, the locking unit includes a first locking part and a second locking part connected to the operating lever. The first locking part and the second locking part are movably connected and spaced apart. When the locking unit is in the locked state, the first locking part and the second locking part can cooperate with each other to clamp the pad block. The first locking part and the second locking part can move relative to each other to switch the locking unit to the unlocked state so that the first locking part is separated from the pad block, thereby allowing the pad block to be removed from the nuclear power plant reactor pad block installation tool.

[0010] The indicating unit includes a first indicating part connected to the first locking part and a second indicating part connected to the second locking part. When the indicating unit is in the first indicating state, the first indicating part and the second indicating part overlap along the length direction of the operating lever. When the indicating unit is in the second indicating state, the first indicating part and the second indicating part intersect along the length direction of the operating lever.

[0011] In some embodiments, the first locking portion and the second locking portion are arranged at intervals along the direction from the first end to the second end, the cross-sectional shape of the first locking portion is adapted to the cross-sectional shape of the central hole of the pad, so that the first locking portion can pass through the central hole, and the second locking portion can abut against the side of the pad;

[0012] The operating lever can rotate relative to the pad block to drive the first locking part to rotate, so that the orthographic projection of the first locking part on the surface of the pad block coincides with the orthographic projection of the central hole on the surface of the pad block, thereby causing the side of the first locking part facing the second locking part to abut against the side of the pad block away from the second locking part.

[0013] The operating lever can also rotate relative to the pad to rotate the first locking part so that the orthographic projection of the first locking part on the surface of the pad completely coincides with the orthographic projection of the central hole on the surface of the pad, so that the first locking part can be pulled out from the central hole and separated from the pad.

[0014] In some embodiments, the first locking part is fixed to the operating lever, the second locking part is movably connected to the operating lever, the second indicating part is fixed to the second locking part, the first indicating part is located on the side of the second indicating part facing the second end, and the first indicating part is fixed to the operating lever and connected to the first locking part through the operating lever.

[0015] In some embodiments, the indicating unit includes a first ring and a second ring sequentially sleeved on the operating lever. The first ring is fixed to the operating lever. A plurality of first indicating portions protrude from the outer peripheral side of the first ring. The plurality of first indicating portions are arranged around the central axis of the operating lever and spaced apart to form a first empty area. The second ring is fixed to the second locking portion. A plurality of second indicating portions protrude from the outer peripheral side of the second ring. The plurality of second indicating portions are arranged around the central axis of the operating lever and spaced apart to form a second empty area.

[0016] Along the length of the operating lever, when the locking unit is in the locked state, the first empty area and the second empty area overlap; when the locking unit is in the unlocked state, the second indicator and the first empty area overlap.

[0017] In some embodiments, the second locking part is annular, the second locking part is sleeved on the outer periphery of the operating rod, and the second locking part is rotatable about the central axis of the operating rod.

[0018] In some embodiments, the nuclear power plant reactor pad installation tool further includes a wear-resistant ring sleeved on the outer periphery of the operating rod, the wear-resistant ring being disposed between the operating rod and the second locking part.

[0019] In some embodiments, the second locking part is slidably connected to the operating lever, and the second locking part is movable along the length direction of the operating lever. The locking unit further includes an elastic element, which is connected to the operating lever and the second locking part respectively. The elastic force of the elastic element can drive the second locking part to approach the first locking part to clamp the pad.

[0020] In some embodiments, the first locking part includes a third ring body and a first protrusion disposed on the outer peripheral side of the third ring body. The third ring body is sleeved on the outer periphery of the operating rod and fixed to the operating rod. The first protrusion can pass through the central hole. When the operating rod is rotated to put the locking unit in the locked state, the first protrusion is staggered with the central hole along the length direction of the operating rod, and the side of the first protrusion facing the second locking part abuts against the side of the pad block away from the second locking part.

[0021] In some embodiments, the locking unit further includes a guide portion having a guide hole. When the locking unit is connected and locked to the pad, the guide hole communicates with the mounting hole of the pad, and the guide hole is used to guide the fastener to extend into the mounting hole.

[0022] In some embodiments, the guide portion is further provided with an adjustment hole communicating with the guide hole. The central axis of the adjustment hole is set at an angle to the central axis of the guide hole. A movable adjustment member is provided in the adjustment hole. The adjustment member can move relative to the guide portion to adjust the length extending into the guide hole. The adjustment member is used to abut against the fastener so that the fastener is fixed to the guide portion.

[0023] The beneficial effects of the nuclear power plant reactor pad installation tool provided in this application are as follows: An indicator unit is set on the operating lever, connected to the locking unit and also to the pad. When the state of the locking unit changes, the indicator unit can synchronously change its state. Thus, the indicator unit can indicate the connection status between the locking unit and the pad, accurately determining whether the pad can be separated from the nuclear power plant reactor pad installation tool under the current state, which helps improve work efficiency. Furthermore, by placing the indicator unit on the side of the locking unit facing the second end, the obstruction of the indicator unit by the locking unit and the pad can be reduced during the pad installation process using the nuclear power plant reactor pad installation tool. This allows the indicator unit to effectively indicate the connection status between the locking unit and the pad, ensuring work efficiency. Attached Figure Description

[0024] 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.

[0025] Figure 1 A schematic diagram showing the unlocked state of the nuclear power plant reactor pad installation tool and the pad provided in the embodiments of this application;

[0026] Figure 2 A schematic diagram showing the locking state of the nuclear power plant reactor pad installation tool and the pad provided in the embodiments of this application;

[0027] Figure 3 A cross-sectional schematic diagram of a nuclear power plant reactor pad installation tool provided in an embodiment of this application;

[0028] Figure 4 A cross-sectional schematic diagram showing the locking state of the nuclear power plant reactor pad installation tool and the pad provided in the embodiments of this application;

[0029] Figure 5 A schematic diagram of the pad provided in an embodiment of this application;

[0030] Figure 6 for Figure 5A cross-sectional view of the pad shown;

[0031] Figure 7 A schematic diagram of the guide section provided in an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of the hoisting assembly and connecting rod provided in an embodiment of this application.

[0033] The following are the labeling elements in the figure:

[0034] 1000, pad; 100, center hole; 1001, round hole; 1002, recess; 200, mounting hole; 300, first side; 400, second side; 2000, locking cup; 3000, bolt; 4000, guide tube; 5000, lifting assembly; 6000, connecting rod;

[0035] 1. Operating lever; 11. First end; 12. Second end;

[0036] 2. Locking unit; 21. First locking part; 211. Third ring body; 212. First protrusion; 22. Second locking part; 23. Guide part; 231. Guide hole; 232. Adjusting element; 24. Elastic element;

[0037] 3. Indicator unit; 31. First indicator section; 32. Second indicator section; 33. First ring body; 34. Second ring body; 35. First empty area; 36. Second empty area;

[0038] 4. Wear-resistant ring;

[0039] 5. Screws;

[0040] 6. Circular gasket. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] However, during actual operation of nuclear power units, the insulation sleeve rubs against the drive mechanism's mounting base in multiple locations due to fluid impact. As operating time accumulates, this rubbing causes the insulation sleeve's height to gradually decrease. When the insulation sleeve sinks to a certain extent, the mounting flange may even detach. To ensure the safe and stable operation of the nuclear reactor, a pad needs to be installed at the top of the guide tube, ensuring the top of the pad abuts against the insulation sleeve to support it and reduce settlement.

[0049] In related technologies, the installation of the pad block can be assisted by a long rod-shaped nuclear power plant reactor pad block installation tool (hereinafter referred to as the installation tool). During installation, the pad block can be locked to one end of the installation tool first, and then the installation tool can be used to carry the pad block into the designated position below the liquid surface for installation and fixation. After the pad block is fixed, the installation tool can be unlocked and separated from the pad block, and then the installation tool can be removed to complete the installation.

[0050] However, during the process of unlocking and separating the installation tool and the pad, the operator has difficulty accurately judging the connection status of the two. Therefore, it is necessary to pull the installation tool multiple times to try to separate it from the pad, which leads to low work efficiency.

[0051] Based on this, embodiments of this application provide an installation tool to improve the installation efficiency of the pad.

[0052] Reference Figure 1 and Figure 2 This application provides an installation tool including an operating lever 1, a locking unit 2, and an indicating unit 3. The operating lever 1 has a first end 11 and a second end 12 disposed opposite to each other. The locking unit 2 is disposed at the first end 11 and is used to connect with a pad 1000. The locking unit 2 has a locked state and an unlocked state. (Refer to...) Figure 2 When locking unit 2 is in the locked state, the locking unit can lock the pad 1000 to fix the pad 1000 to the installation tool, see reference. Figure 1 When the locking unit 2 switches from the locked state to the unlocked state, the pad 1000 can be separated from the installation tool. The indicator unit 3 is disposed on the outer periphery of the operating lever 1 and located on the side of the locking unit 2 facing the second end 12. The indicator unit 3 is connected to the locking unit 2 and the pad and is used to indicate the positional relationship between the locking unit 2 and the pad 1000. The indicator unit 3 has a first indicator state and a second indicator state, as shown in the reference. Figure 2 When locking unit 2 is in the locked state, indicating unit 3 is in the first indicating state, as shown in the reference. Figure 1 When the locking unit 2 switches from the locked state to the unlocked state, the indicator unit 3 simultaneously switches from the first indicator state to the second indicator state.

[0053] It should be noted that the installation tool provided in this application embodiment is used to assist in installing the pad 1000 on the top of the nuclear power plant reactor control rod guide tube 4000.

[0054] It should be noted that the second end 12 of the operating lever 1 can be connected to a power mechanism such as a hoist to move the pad 1000 to the top of the guide cylinder 4000. In addition, during the installation of the pad 1000, the first end 11 of the operating lever 1 can drive the pad 1000 to extend below the liquid surface for auxiliary installation.

[0055] It should be noted that the indicator unit 3 is connected to the locking unit 2, which can be a physical connection between the indicator unit 3 and the locking unit 2. When the position of the components in the locking unit 2 changes, so that the connection state between the locking unit 2 and the pad 1000 changes, the components in the indicator unit 3 can change accordingly. The indicator unit 3 is located on the outer periphery of the operating lever 1 and on the side of the locking unit 2 facing the second end 12. The pad 1000, the locking unit 2 and other structures will not obstruct the indicator unit 3. At this time, the connection state between the locking unit 2 and the pad 1000 can be reflected by the position of the components in the indicator unit 3. During the installation of the pad 1000, the indicator unit 3 can be located above or below the liquid surface. When the indicator unit 3 is below the liquid surface, in some embodiments, the recognizability of the indicator unit 3 can be enhanced by increasing the size of the indicator unit 3 or adjusting the color of the indicator unit 3.

[0056] Alternatively, the indicating unit 3 can be electrically connected to the locking unit 2. The indicating unit 3 can detect the relative positions of each component within the locking unit 2 and the pad 1000, thereby determining and indicating the connection status between the locking unit 2 and the pad 1000. For example, the indicating unit 3 may include an indicator light, a horn, etc.

[0057] It should be noted that the relative position of the locking unit 2 and the pad 1000 changes when the locking unit is in the locked state and the unlocked state. For example, when the locking unit 2 is in the locked state, it can abut against or clamp the pad 1000. When the locking unit 2 is in the unlocked state, it can be separated from the pad. Thus, the locking unit 2 and the pad 1000 can have different positional relationships in different states. The indicating unit 3 can indicate the current positional relationship between the locking unit 2 and the pad 1000, thereby determining the current state of the locking unit 2.

[0058] It should be noted that the indicator unit 3 and the pad 1000 can be directly connected, that is, the two are in direct contact. In addition, the indicator unit 3 and the pad 1000 can also be indirectly connected, that is, the two are not in direct contact, and the two can be connected through other components.

[0059] An indicator unit 3 is installed on the operating lever 1. The indicator unit 3 is connected to the locking unit 2 and can also be connected to the pad 1000. When the state of the locking unit 2 changes, the indicator unit 3 can synchronously change its state. In this way, the indicator unit 3 can indicate the connection state between the locking unit 2 and the pad 1000, thereby accurately determining whether the pad 1000 can be separated from the installation tool in the current state, which helps to improve the efficiency of the operation. The indicator unit 3 is set on the side of the locking unit 2 facing the second end 12. During the process of using the installation tool to assist in the installation of the pad 1000, the obstruction of the indicator unit 3 by the locking unit 2 and the pad 1000 can be reduced. In this way, the indicator unit 3 can effectively indicate the connection state between the locking unit 2 and the pad 1000, ensuring the efficiency of the operation.

[0060] Reference Figure 3 and Figure 4 The locking unit 2 includes a first locking part 21 and a second locking part 22 connected to the operating lever 1. The first locking part 21 and the second locking part 22 are movably connected and spaced apart. When the locking unit 2 is in the locked state, the first locking part 21 and the second locking part 22 cooperate to clamp the pad 1000. The first locking part 21 and the second locking part 22 can move relative to each other to switch the locking unit 2 to the unlocked state, so that the first locking part 21 is separated from the side of the pad 1000, thereby allowing the pad 1000 to be detached from the installation tool. The indicating unit 3 includes a first indicating part 31 connected to the first locking part 21 and a second indicating part 32 connected to the second locking part 22. When the indicating unit 3 is in the first indicating state, the first indicating part 31 and the second indicating part 32 overlap along the length direction of the operating lever 1. When the indicating unit 3 is in the second indicating state, the first indicating part 31 and the second indicating part 32 intersect along the length direction of the operating lever 1.

[0061] It should be noted that the first indicator 31 is connected to the first locking part 21. The first indicator 31 and the first locking part 21 can be directly or indirectly connected. Regardless of the connection method, during the installation of the pad 1000 using the installation tool, the first indicator 31 and the first locking part 21 remain relatively stationary. The second indicator 32 is connected to the second locking part 22. The second indicator 32 and the second locking part 22 can be directly or indirectly connected. Regardless of the connection method, during the installation of the pad 1000 using the installation tool, the second indicator 32 and the second locking part 22 remain relatively stationary. Thus, when the relative position of the first locking part 21 and the second locking part 22 changes, it can cause a relative position change in the first indicator 31 and the second indicator 32.

[0062] When the locking unit 2 is in the locked state, the indicator unit 3 is in the first indicator state, and the first indicator part 31 and the second indicator part 32 overlap along the length direction of the operating lever 1. When the locking unit 2 is in the unlocked state, the indicator unit 3 is in the second indicator state, and the first indicator part 31 and the second indicator part 32 are staggered along the length direction of the operating lever 1. That is, the relative position of the first indicator part 31 and the second indicator part 32 can change with the connection state between the locking unit 2 and the pad 1000. In this way, the connection state between the locking unit 2 and the pad 1000 can be determined by observing the relative position of the first indicator part 31 and the second indicator part 32, thereby improving the efficiency of the pad 1000 installation operation.

[0063] Continue to refer to Figure 3 and Figure 4 The first locking part 21 and the second locking part 22 are arranged at intervals along the direction from the first end 11 to the second end 12. The cross-sectional shape of the first locking part 21 is adapted to the cross-sectional shape of the central hole 100 of the pad 1000, so that the first locking part 21 can pass through the central hole 100. The second locking part 22 abuts against the side of the pad 1000. The operating lever 1 can rotate relative to the pad 1000 to drive the first locking part 21 to rotate, so that the orthographic projection of the first locking part 21 on the surface of the pad 1000 is aligned with the central hole 100. The orthographic projection of the central hole 100 onto the surface of the pad 1000 partially overlaps, so that the side of the first locking part 21 facing the second locking part 22 abuts against the side of the pad 1000 away from the second locking part 22; the operating lever 1 can also rotate relative to the pad 1000 to drive the first locking part 21 to rotate so that the orthographic projection of the first locking part 21 onto the surface of the pad 1000 completely overlaps with the orthographic projection of the central hole 100, so that the first locking part 21 can be pulled out from the central hole 100 and separated from the pad 1000.

[0064] It should be noted that, referring to Figure 5 and Figure 6The pad 1000 has a central hole 100, and the cross-section of the central hole 100 of the pad 1000 is an irregular shape. The central hole 100 can be regarded as two parts, one of which is a circular hole 1001 set in the center of the pad 1000. A recess 1002 is provided on the hole wall of the circular hole 1001. The recess 1002 and the circular hole 1001 are connected to form the central hole 100. The cross-sectional shape of the first locking part 21 is adapted to the cross-sectional shape of the central hole 100 of the pad 1000. Thus, the first locking part 21 can form a protrusion at the position corresponding to the recess 1002 of the pad 1000. When the first locking part 21 passes through the central hole 100, the protrusion of the first locking part 21 can pass through the recess 1002 of the central hole 100. Then, the first locking part 21 can be rotated relative to the pad 1000 so that the protrusion of the first locking part 21 and the recess 1002 of the central hole 100 are intersected. Thus, the first locking part 21 can abut against the side of the pad 1000 away from the second locking part 22 to achieve clamping and locking of the pad 1000.

[0065] It should be noted that the orthographic projection of the first locking part 21 on the surface of the pad 1000 means that the shape of the first locking part 21 is projected onto the plane where the surface of the pad 1000 is located using a set of projection rays perpendicular to the surface of the pad 1000; the orthographic projection of the center hole 100 on the surface of the pad 1000 means that the center hole 100 is first regarded as a solid structure, and the shape of the solidified center hole 100 is projected onto the plane where the surface of the pad 1000 is located using a set of projection rays perpendicular to the surface of the pad 1000. The fact that the orthographic projection of the first locking part 21 on the surface of the pad 1000 coincides with a portion of the orthographic projection of the center hole 100 on the surface of the pad 1000 means that the orthographic projection of the first locking part 21 on the surface of the pad 1000 and the orthographic projection of the center hole 100 on the surface of the pad 1000 are not completely coincident. A portion of the orthographic projection of the first locking part 21 on the surface of the pad 1000 overlaps with a portion of the orthographic projection of the center hole 100 on the surface of the pad 1000, while another portion of the orthographic projection of the first locking part 21 on the surface of the pad 1000 does not overlap with another portion of the orthographic projection of the center hole 100 on the surface of the pad 1000.

[0066] The first locking part 21 and the second locking part 22 are arranged at intervals along the direction from the first end 11 to the second end 12, that is, the first locking part 21 and the second locking part 22 are arranged at intervals along the length of the operating lever 1. After the first locking part 21 passes through the center hole 100 of the pad 1000, the first locking part 21 and the second locking part 22 can be located on both sides of the pad 1000 respectively. After the first locking part 21 rotates relative to the pad 1000, the first locking part 21 and the second locking part 22 can abut against the opposite sides of the pad 1000 respectively. In this way, the pad 1000 can... The tool is clamped and locked in the locking unit 2, thus connecting the installation tool to the pad 1000. The first locking part 21 is fixed to the operating lever 1. When the operating lever 1 is rotated, the first locking part 21 can be rotated, thereby changing the relative position between the first locking part 21 and the pad 1000. This allows the orthographic projection of the first locking part 21 on the surface of the pad 1000 to completely coincide with the orthographic projection of the center hole 100. This allows the first locking part 21 to pass through the center hole 100, allowing the installation tool to be inserted into or removed from the pad 1000.

[0067] Reference Figure 6 In this embodiment, the pad 1000 has a first side 300 and a second side 400 facing away from each other. The first side 300 and the second side 400 are arranged along the central axis of the central hole 100 of the pad 1000. When the installation tool is connected to the pad 1000 and the locking unit 2 is in the locked state, the first locking part 21 and the second locking part 22 can abut against the first side 300 and the second side 400 respectively. When the operating lever 1 is rotated to switch the locking unit 2 to the unlocked state, the first locking part 21 rotates in a direction parallel to the first side 300 and can rotate to separate from the first side 300. At this time, the installation tool can be pulled out from the central hole 100 of the pad 1000 to separate the installation tool from the pad 1000.

[0068] Reference Figure 3 and Figure 4 In some embodiments, the first locking part 21 includes a third ring body 211 and a first protrusion 212 disposed on the outer peripheral side of the third ring body 211. The third ring body 211 is sleeved on the outer periphery of the operating rod 1 and fixed to the operating rod 1. The first protrusion 212 can pass through the central hole 100. When the operating rod 1 is rotated to lock the locking unit 2, the first protrusion 212 is intersected with the central hole 100 along the length direction of the operating rod 1. The side of the first protrusion 212 facing the second locking part 22 abuts against the side of the pad block 1000 away from the second locking part 22.

[0069] It should be noted that, referring to Figure 5 and Figure 6The central hole 100 of the pad 1000 can be regarded as two parts. One part is a circular hole 1001 set in the center of the pad 1000. A recess 1002 is provided on the hole wall of the circular hole 1001. The recess 1002 and the circular hole 1001 are connected to form the central hole 100. When the first locking part 21 passes through the central hole 100, the third ring 211 of the first locking part 21 passes through the circular hole 1001 portion of the central hole 100, and the first protrusion 212 of the first locking part 21 passes through the recess 1002 of the central hole 100. When the operating lever 1 is rotated to lock the locking unit 2, the first protrusion 212 intersects with the central hole 100 along the length direction of the operating lever 1. At this time, the first protrusion 212 intersects with the recess 1002 of the central hole 100, and the orthographic projection of the first protrusion 212 of the first locking part 21 on the surface of the pad 1000 does not coincide with the orthographic projection of the recess 1002 of the central hole 100.

[0070] The third ring 211 allows the first locking part 21 to be fitted onto the outer periphery of the operating lever 1, thus reducing the difficulty of connecting the first locking part 21 to the operating lever 1. The first protrusion 212 on the outer periphery of the third ring 211 allows the cross-sectional shape of the first locking part 21 to match the cross-sectional shape of the central hole 100 of the pad 1000. This ensures that the first locking part 21 can pass through the central hole 100 of the pad 1000 while also allowing the first protrusion 212 to intersect with the central hole 100, thereby locking the pad 1000 by the locking unit 2.

[0071] In this embodiment of the application, the pad 1000 has three recesses 1002, and the first locking part 21 can be provided with three first protrusions 212. The three first protrusions 212 are evenly spaced around the central axis of the operating rod 1. During operation, the operating rod 1 can be rotated 120° to lock and unlock the locking unit 2 and the pad 1000.

[0072] Reference Figure 3 and Figure 4 In some embodiments, the first locking part 21 can be fixed to the operating lever 1 by fasteners such as screws 5.

[0073] Continue to refer to Figure 3 and Figure 4 The first locking part 21 is fixed to the operating lever 1, the second locking part 22 is movably connected to the operating lever 1, the second indicator part 32 is fixed to the second locking part 22, the first indicator part 31 is located on the side of the second indicator part 32 facing the second end 12, the first indicator part 31 is fixed to the operating lever 1 and connected to the first locking part 21 through the operating lever 1.

[0074] It should be noted that the second locking part 22 is movably connected to the operating lever 1. After the first locking part 21 passes through the central hole 100, the second locking part 22 can abut against the side of the pad 1000. After the second locking part 22 abuts against the side of the pad 1000, a relative force will be generated. When the operating lever 1 is rotated, the relative force between the second locking part 22 and the pad 1000 will form a frictional force to resist the rotation of the second locking part 22, so that the second locking part 22 can remain stationary with the pad 1000. At this time, the second locking part 22 and the operating lever 1 can generate relative movement.

[0075] The first indicator 31 is fixed to the operating lever 1, and the second indicator 32 is fixed to the second locking part 22. When the operating lever 1 is rotated to change the position of the first locking part 21 and the second locking part 22, the relative position between the first indicator 31 and the second indicator 32 will also change. In this way, the connection status between the locking unit 2 and the pad 1000 can be easily observed and judged directly. The first indicator 31 is fixed to the operating lever 1 and connected to the first locking part 21 through the operating lever 1. The first indicator 31 does not need to pass through the center hole 100 of the pad 1000 along with the first locking part 21. In this way, the obstruction of the first indicator 31 by the pad 1000 can be reduced, which helps the indicator unit 3 to intuitively reflect the connection status between the locking unit 2 and the pad 1000.

[0076] In some embodiments, the first indicator 31 can be fixed to the operating lever 1 by fasteners such as screws 5. The second indicator 32 can be fixed to the second locking part 22 by fasteners such as screws 5.

[0077] Reference Figure 1 and Figure 2 The indicator unit 3 includes a first ring 33 and a second ring 34 sequentially sleeved on the operating lever 1. The first ring 33 is fixed to the operating lever 1. The outer peripheral side of the first ring 33 protrudes to form a plurality of first indicator portions 31. The plurality of first indicator portions 31 are arranged around the central axis of the operating lever 1 and are spaced apart to form a first empty area 35. The second ring 34 is fixed to the second locking portion 22. The outer peripheral side of the second ring 34 protrudes to form a plurality of second indicator portions 32. The plurality of second indicator portions 32 are arranged around the central axis of the operating lever 1 and are spaced apart to form a second empty area 36. When the locking unit 2 is in the locked state, the first empty area 35 and the second empty area 36 overlap along the length direction of the operating lever 1. When the locking unit 2 is in the unlocked state, the second indicator portions 32 and the first empty area 35 overlap along the length direction of the operating lever 1.

[0078] It should be noted that when the locking unit 2 is in the locked state, the first empty area 35 and the second empty area 36 overlap along the length direction of the operating lever 1, and the first indicator 31 and the second indicator 32 overlap; when the locking unit 2 is in the unlocked state, the first indicator 31 and the second empty area 36 overlap along the length direction of the operating lever 1, and the second indicator 32 overlaps with the first indicator 31, that is, the first indicator 31 and the second indicator 32 are interleaved.

[0079] Multiple first indicator parts 31 are arranged around the central axis of the operating lever 1 and spaced apart to form a first empty area 35. Multiple second indicator parts 32 are arranged around the central axis of the operating lever 1 and spaced apart to form a second empty area 36. When the locking unit 2 is in the locked state, the first indicator parts 31 and the second indicator parts 32 overlap, and the first indicator parts 31 can block the second indicator parts 32. At this time, the operator located at the second end 12 of the operating lever 1 cannot see the second indicator parts 32 through the first indicator parts 31. When the locking unit 2 is in the unlocked state, the second indicator parts 32 and the first empty area 35 overlap. At this time, the first indicator parts 31 will not block the second indicator parts 32, and the operator located at the second end 12 of the operating lever 1 can see the second indicator parts 32 through the first empty area 35. In this way, the operator can directly judge the connection status between the locking unit 2 and the pad block 1000 by observing the position of the second indicator parts 32, thereby improving the efficiency of the installation operation.

[0080] In some embodiments, a coating may be provided on the surface of the second indicator 32 so that the appearance color of the second indicator 32 is different from the appearance color of the first indicator 31, the operating lever 1 and the locking unit 2, so that the position of the second indicator 32 can be more intuitively determined.

[0081] For example, the second indicator 32 can be red. In this case, the first indicator 31, the operating lever 1, and the locking unit 2 can be silver, yellow, black, or other colors other than red. Of course, the first indicator 31, the operating lever 1, and the locking unit 2 can be the same or different colors.

[0082] Reference Figure 3 and Figure 4 In some embodiments, the second locking part 22 is annular, the second locking part 22 is sleeved on the outer periphery of the operating rod 1, and the second locking part 22 can rotate around the central axis of the operating rod 1.

[0083] The second locking part 22 is sleeved on the outer periphery of the operating lever 1. The second locking part 22 can rotate around the central axis of the operating lever 1. When the operating lever 1 is rotated to drive the first locking part 21 to rotate relative to the pad 1000, the interaction force between the second locking part 22 and the pad 1000 can generate friction, which can cause the second locking part 22 to rotate relative to the operating lever 1 and remain stationary relative to the pad 1000. This allows the first indicating part 31 and the second indicating part 32 to produce corresponding position changes, accurately indicating the connection state between the locking unit 2 and the pad 1000. The second locking part 22 can move along the length direction of the operating lever 1.

[0084] In some embodiments, the second locking part 22 and the operating lever 1 can be fitted with a clearance, so that there is a gap between the inner side of the second locking part 22 and the outer peripheral side of the operating lever 1, so as to enable the second locking part 22 to rotate around the central axis of the operating lever 1.

[0085] In some embodiments, the installation tool further includes a wear-resistant ring 4 sleeved on the outer periphery of the operating lever 1, the wear-resistant ring 4 being disposed between the operating lever 1 and the second locking part 22.

[0086] A wear-resistant ring 4 is provided between the operating lever 1 and the second locking part 22 to reduce friction between the operating lever 1 and the second locking part 22, thereby reducing wear on the operating lever 1 and the second locking part 22.

[0087] In some embodiments, the second locking part 22 is slidably connected to the operating lever 1, and the second locking part 22 can move along the central axis of the operating lever 1. The locking unit 2 also includes an elastic element 24, which is connected to the operating lever 1 and the second locking part 22 respectively. The elastic force of the elastic element 24 can drive the second locking part 22 to approach the first locking part 21 to clamp the pad 1000.

[0088] The second locking part 22 is slidably connected to the operating lever 1, allowing the second locking part 22 to move along the length direction of the operating lever 1. The distance between the second locking part 22 and the first locking part 21 along the length direction of the operating lever 1 is variable. Thus, the distance between the second locking part 22 and the first locking part 21 can be adjusted according to different sizes of pads 1000, enabling the installation tool to assist in installing pads 1000 of different sizes and improving the versatility of the installation tool. An elastic element 24 is used to connect the operating lever 1 and the second locking part 22. The elastic force of the elastic element 24 can drive the second locking part 22 closer to the first locking part 21. Under the action of the elastic force of the elastic element 24, the second locking part 22 always has a tendency to move towards the first locking part 21, that is, the second locking part 22 and the first locking part 21 always have a tendency to move closer to each other. In this way, the second locking part 22 and the first locking part 21 can stably clamp the pad 1000.

[0089] In some embodiments, the elastic element 24 is a spring, which is sleeved on the outer periphery of the operating lever 1.

[0090] In some embodiments, the installation tool further includes an annular washer 6, which is sleeved on the outer periphery of the operating rod 1 and located between the elastic member 24 and the second locking part 22. The two sides of the annular washer 6 abut against the elastic member 24 and the second locking part 22 respectively, so that the elastic force of the elastic member 24 can be evenly applied to the second locking part 22.

[0091] In some embodiments, the second locking part 22 is annular, the second locking part 22 is sleeved on the outer periphery of the operating rod 1, and the second locking part 22 can rotate around the central axis of the operating rod 1 and can move along the length direction of the operating rod 1. That is, the second locking part 22 can rotate around the central axis of the operating rod 1 and can also move along the length direction of the operating rod 1.

[0092] Reference Figures 1 to 4 The locking unit 2 also includes a guide part 23, which is provided with a guide hole 231. When the locking unit 2 is connected and locked to the pad 1000, the guide hole 231 communicates with the mounting hole 200 of the pad 1000. The guide hole 231 is used to guide fasteners (such as locking cup 2000, bolt 3000, etc.) into the mounting hole 200.

[0093] When the locking unit 2 is connected and locked to the pad 1000, the guide hole 231 of the guide part 23 communicates with the mounting hole 200 of the pad 1000. The fastener can be inserted into the mounting hole 200 of the pad 1000 under the guidance of the guide hole 231. In this way, the installation difficulty of the pad 1000 can be reduced and the efficiency of the installation operation can be improved.

[0094] Reference Figure 5 and Figure 6 The pad 1000 is provided with three mounting holes 200. The locking unit 2 can be provided with three guide parts 23. Each guide part 23 is provided with a guide hole 231. When the locking unit 2 is connected and locked to the pad 1000, the three guide holes 231 are respectively connected to the three mounting holes 200.

[0095] In some embodiments, the guide portion 23 can be connected to the second locking portion 22 of the locking unit 2. In this case, the guide portion 23 is movably connected to the operating lever 1 through the second locking portion 22. During the process of locking or unlocking the locking unit 2 and the pad 1000 by rotating the operating lever 1, the relative position of the guide portion 23 and the pad 1000 will not change. In this way, the positioning difficulty between the guide portion 23 and the pad 1000 can be reduced, thereby reducing the positioning difficulty between the guide hole 231 and the mounting hole 200, so as to ensure the guiding effect of the guide hole 231 on the fastener.

[0096] Reference Figure 5 and Figure 7 The guide portion 23 is also provided with an adjustment hole that communicates with the guide hole 231. The central axis of the adjustment hole is set at an angle to the central axis of the guide hole 231. A movable adjustment member 232 is provided in the adjustment hole. The adjustment member 232 can move relative to the guide portion 23 to adjust the length of the extension into the guide hole 231. The adjustment member 232 is used to abut against the fastener so that the fastener is fixed to the guide portion 23.

[0097] It should be noted that the central axis of the adjusting hole is set at an angle to the central axis of the guide hole 231. The angle between the central axis of the adjusting hole and the central axis of the guide hole 231 can be an acute angle, a right angle, or an obtuse angle.

[0098] A movable adjusting member 232 is provided in the adjusting hole. The adjusting member 232 can move relative to the guide part 23 to adjust the length of the extension into the guide hole 231. The fastener can be placed into the guide hole 231 first, and the adjusting member 232 can be extended into the guide hole 231 to abut against the fastener. At this time, the fastener can be fixed in the guide hole 231. After the installation tool is connected and locked to the pad 1000, the adjusting member 232 is moved to separate from the fastener. At this time, the fastener can enter the mounting hole 200 of the pad 1000 under the guidance of the guide hole 231. In this way, the difficulty of operation can be reduced.

[0099] In some embodiments, the adjusting hole can be a threaded hole, and the adjusting member 232 can be a screw adapted to the threaded hole. The screw is screwed into the threaded hole, and the position of the screw can be changed by turning the screw to adjust the length of the screw extending into the guide hole 231.

[0100] Reference Figure 8 In some embodiments, the installation tool further includes a hoisting assembly 5000 and a connecting rod 6000 connecting the hoisting assembly 5000 and the operating rod 1, wherein the hoisting assembly 5000 is used to connect to the hoisting equipment, one end of the connecting rod 6000 is connected to the hoisting assembly 5000, and the other end is connected to the second end 12 of the operating rod 1.

[0101] Thus, during the installation of pad 1000, lifting equipment can be used to move pad 1000, which helps to reduce the difficulty of the installation work.

[0102] In some embodiments, the length of the control lever 1 is approximately 10 meters.

[0103] In this embodiment, the pad 1000 can be assisted in being installed on the top of the guide cylinder 4000 using an installation tool according to the following steps:

[0104] S10. Transport the installation tools and 1000 pads to the side of the reactor building pool in the nuclear power plant and store them. Install an underwater camera underwater in the pool and lift the upper reactor internal components out of the reactor pressure vessel.

[0105] S20. Place the pad 1000 flat on a plane, so that the first locking part 21 of the installation tool passes through the center hole 100 of the pad 1000, and align and connect the guide hole 231 of the installation tool with the mounting hole 200 of the pad 1000. Apply downward pressure to the operating lever 1 and rotate it by a preset angle so that the first indicator part 31 and the second indicator part 32 overlap. The second indicator part 32 is blocked by the first indicator part 31 and cannot be seen. The pad 1000 is locked by the locking unit 2.

[0106] S30. Adjust the position of the adjusting component 232 and connect the fastener (such as the locking cup 2000, bolt 3000, etc.) to the pad 1000.

[0107] S40. Using a vehicle and installation tools, place the pad 1000 underwater. With the help of an underwater camera, install the pad 1000 on top of the guide cylinder 4000 and screw the bolt 3000 into the threaded hole on top of the guide cylinder 4000 to fix the pad 1000 to the guide cylinder 4000.

[0108] S50, rotate the operating lever 1 to unlock the locking unit 2, and when the first indicator 31 and the second indicator 32 are observed to be intersecting, pull out the installation tool to separate the installation tool from the pad 1000.

[0109] 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 nuclear power plant reactor pad installation tool characterized by, include: An operating lever having a first end and a second end disposed opposite to each other; A locking unit is disposed at the first end and used to connect with the pad block. The locking unit has a locked state and an unlocked state. When the locking unit is in the locked state, the locking unit can lock the pad block to fix the pad block to the nuclear power plant reactor pad block installation tool. When the locking unit switches from the locked state to the unlocked state, the pad block can be separated from the nuclear power plant reactor pad block installation tool. An indicator unit is disposed on the outer periphery of the operating lever and located on the side of the locking unit facing the second end. The indicator unit is connected to the locking unit and the pad and is used to indicate the positional relationship between the locking unit and the pad. The indicator unit has a first indicator state and a second indicator state. When the locking unit is in the locked state, the indicator unit is in the first indicator state. When the locking unit switches from the locked state to the unlocked state, the indicator unit simultaneously switches from the first indicator state to the second indicator state.

2. The nuclear power plant reactor pad installation tool of claim 1, wherein, The locking unit includes a first locking part and a second locking part connected to the operating lever. The first locking part and the second locking part are movably connected and spaced apart. When the locking unit is in the locked state, the first locking part and the second locking part can cooperate with each other to clamp the pad block. The first locking part and the second locking part can move relative to each other to switch the locking unit to the unlocked state so that the first locking part is separated from the pad block, thereby allowing the pad block to be removed from the nuclear power plant reactor pad block installation tool. The indicating unit includes a first indicating part connected to the first locking part and a second indicating part connected to the second locking part. When the indicating unit is in the first indicating state, the first indicating part and the second indicating part overlap along the length direction of the operating lever. When the indicating unit is in the second indicating state, the first indicating part and the second indicating part intersect along the length direction of the operating lever.

3. The nuclear power plant reactor pad installation tool of claim 2, wherein, The first locking part and the second locking part are arranged at intervals along the direction from the first end to the second end. The cross-sectional shape of the first locking part is adapted to the cross-sectional shape of the central hole of the pad, so that the first locking part can pass through the central hole and the second locking part can abut against the side of the pad. The operating lever can rotate relative to the pad block to drive the first locking part to rotate, so that the orthographic projection of the first locking part on the surface of the pad block coincides with the orthographic projection of the central hole on the surface of the pad block, thereby causing the side of the first locking part facing the second locking part to abut against the side of the pad block away from the second locking part. The operating lever can also rotate relative to the pad to rotate the first locking part so that the orthographic projection of the first locking part on the surface of the pad completely coincides with the orthographic projection of the central hole on the surface of the pad, so that the first locking part can be pulled out from the central hole and separated from the pad.

4. The nuclear power plant reactor pad installation tool of claim 3, wherein, The first locking part is fixed to the operating lever, the second locking part is movably connected to the operating lever, the second indicating part is fixed to the second locking part, the first indicating part is located on the side of the second indicating part facing the second end, and the first indicating part is fixed to the operating lever and connected to the first locking part through the operating lever.

5. The nuclear power plant reactor pad installation tool of claim 4, wherein, The indicating unit includes a first ring and a second ring sequentially sleeved on the operating lever. The first ring is fixed to the operating lever. The outer peripheral side of the first ring protrudes to form a plurality of first indicating parts. The plurality of first indicating parts are arranged around the central axis of the operating lever and spaced apart to form a first empty area. The second ring is fixed to the second locking part. The outer peripheral side of the second ring protrudes to form a plurality of second indicating parts. The plurality of second indicating parts are arranged around the central axis of the operating lever and spaced apart to form a second empty area. Along the length of the operating lever, when the locking unit is in the locked state, the first empty area and the second empty area overlap; when the locking unit is in the unlocked state, the second indicator and the first empty area overlap.

6. The nuclear power plant reactor pad installation tool as described in claim 4, characterized in that, The second locking part is ring-shaped and is sleeved on the outer periphery of the operating rod, and the second locking part can rotate around the central axis of the operating rod.

7. The nuclear power plant reactor pad installation tool as described in claim 6, characterized in that, The nuclear power plant reactor pad installation tool also includes a wear-resistant ring sleeved on the outer periphery of the operating rod, the wear-resistant ring being disposed between the operating rod and the second locking part.

8. The nuclear power plant reactor pad installation tool of claim 4, wherein, The second locking part is slidably connected to the operating lever. The second locking part can move along the length direction of the operating lever. The locking unit also includes an elastic element, which is connected to the operating lever and the second locking part respectively. The elastic force of the elastic element can drive the second locking part to approach the first locking part to clamp the pad.

9. The nuclear power plant reactor pad installation tool of claim 3, wherein, The first locking part includes a third ring body and a first protrusion disposed on the outer peripheral side of the third ring body. The third ring body is sleeved on the outer periphery of the operating rod and fixed to the operating rod. The first protrusion can pass through the central hole. When the operating rod is rotated to put the locking unit in the locked state, the first protrusion and the central hole are intersected along the length direction of the operating rod, and the side of the first protrusion facing the second locking part abuts against the side of the pad block away from the second locking part.

10. The nuclear power plant reactor pad installation tool of any one of claims 1-9, wherein, The locking unit further includes a guide portion with a guide hole. When the locking unit is connected and locked to the pad, the guide hole communicates with the mounting hole of the pad, and the guide hole is used to guide the fastener into the mounting hole.

11. The nuclear power plant reactor pad installation tool of claim 10, wherein, The guide portion is also provided with an adjustment hole communicating with the guide hole. The central axis of the adjustment hole is set at an angle to the central axis of the guide hole. A movable adjustment member is provided in the adjustment hole. The adjustment member can move relative to the guide portion to adjust the length extending into the guide hole. The adjustment member is used to abut against the fastener so that the fastener is fixed to the guide portion.

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