Lock cup remover

Abstract

The present invention relates to a lock cup removal device. According to one embodiment of the present invention, damage to the threads of the cap screw is prevented when removing the lock cup, the possibility of safety accidents caused by physical impact to the worker is reduced, work efficiency is improved by shortening the time required to remove the lock cup, and maintenance unit costs are reduced and maintenance productivity is increased due to the reduction in maintenance time.

Description

Technology Field

[0001] The present invention relates to a lock cup removal device, and more specifically, to a device for removing a lock cup of a cap screw that fixes a seal of an RCP (Reactor Coolant Pump). Background Technology

[0003] The Reactor Coolant Pump (RCP), a critical component of the Nuclear Steam Supply System (NSSS) in a nuclear power plant, plays the role of circulating high-temperature, high-pressure coolant between the reactor and the steam generator.

[0004] The RCP SEAL is a key component that prevents high-temperature, high-pressure cooling water inside the pump from leaking out through the gap between the pump's rotating and stationary bodies.

[0005] The RCP SEAL is essential for maintaining the safety of the nuclear power plant by preventing high-temperature, high-pressure coolant from leaking to the outside.

[0006] These RCP SEALs consist of various parts, among which cap screws are used to secure each part of the SEAL.

[0007] In particular, the CAP SCREW is used together with a part called a LOCK CUP to ensure that it is fastened so as not to come loose even under vibration or shock.

[0008] The disassembly and assembly of the RCP SEAL circulation unit is an essential part of the regular maintenance process.

[0009] During this process, the worker must loosen the cap screw to remove the lock cup.

[0010] Previously, to remove the lock cup, tools such as monkey wrenches, long-nose pliers, and pliers were used to grasp the head of the cap screw and strike the lock cup to remove it.

[0011] This method not only had low work efficiency but also posed a risk of safety accidents, such as damage to the threads of the cap screw or physical injury to the worker.

[0012] In addition, the existing method was difficult to work with because it was difficult to center the lock cup.

[0013] There was also a problem in that the work time was prolonged and the worker's fatigue increased because the worker had to hold the threaded part of the cap screw with their hand or use pliers to maintain the center.

[0014] In addition, there was a high possibility that the threads of the cap screw would be damaged due to the impact generated during the process of striking the lock cup.

[0015] Cap screws with damaged threads cannot be reused, which can lead to increased maintenance costs.

[0016] As such, the existing lock cup removal method had several problems in terms of work efficiency, safety, and maintenance costs.

[0017] Therefore, a new lock cup removal method was needed to solve these problems, improve work efficiency, and prevent safety accidents. Prior art literature

[0019] Korean Registered Patent 10-1205990 (Published Nov. 29, 2012) The problem to be solved

[0020] Accordingly, the present invention was conceived against the aforementioned background, and aims to provide a lock cup removal device that can reduce the possibility of safety accidents and damage to the cap screw threads occurring during the process of removing the lock cup during the disassembly / assembly of the RCP SEAL circulation part, and improve work efficiency.

[0021] The objectives of the present invention are not limited thereto, and other unmentioned objectives will be clearly understood by a person skilled in the art from the description below. means of solving the problem

[0023] To achieve this purpose, one embodiment of the present invention provides a lock cup removal device for removing a lock cup of a cap screw that fixes a seal of an RCP (Reactor Coolant Pump), comprising: a holding plate having a fixing hole formed therein so that the lower part of the cap screw, to which the lock cup is coupled, is inserted and fixed to the upper head; and a lock cup remover that causes the lock cup to detach from the head by an external force applied downward while in a fixed position in contact with the upper surface of the head.

[0024] Additionally, the lock cup remover comprises: a body formed with a longitudinally movable guide groove formed on the inner side and a hollow lock cup separating arm protruding and extending from the lower side in communication with the movable guide groove; a rod that moves up and down, with its upper end passing through the lock cup separating arm of the body and positioned within the movable guide groove, and its lower end contacting the upper surface of the head; and an elastic member that elastically supports the upper end of the rod within the movable guide groove; and provides a lock cup removal device that causes the lock cup separating arm to detach the lock cup from the head by the external force applied downward to the body.

[0025] Additionally, the above rod further includes a limit projection formed to protrude outwardly in the radial direction on the upper part, and the body further includes a limit step formed to protrude inwardly on the wall of the moving guide groove to contact the limit projection so as to limit the withdrawal length of the rod, thereby providing a lock cup removal device. Effects of the invention

[0027] According to one embodiment of the present invention, damage to the threads of the cap screw is prevented when removing the lock cup, the possibility of safety accidents caused by physical impact to the worker is reduced, work efficiency is improved by shortening the time required to remove the lock cup, and maintenance unit costs are reduced and maintenance productivity is increased due to the reduction in maintenance time. Brief explanation of the drawing

[0029] FIG. 1 is a perspective view of a lock cup removal device according to an embodiment of the present invention. FIG. 2 is a rear perspective view of a holding plate. FIG. 3 is an exploded perspective view of a lock cup remover. FIG. 4 is a cross-sectional view of FIG. 3. FIG. 5 to 7 are drawings showing the process of removing a lock cup of a cap screw using a lock cup removal device according to an embodiment of the present invention. Specific details for implementing the invention

[0030] Hereinafter, some embodiments of the present invention will be described in detail with reference to the exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions could obscure the essence of the invention, such detailed description is omitted.

[0031] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0032] FIG. 1 is a perspective view of a lock cup removal device according to an embodiment of the present invention. FIG. 2 is a rear perspective view of a holding plate. FIG. 3 is an exploded perspective view of a lock cup remover. FIG. 4 is a cross-sectional view of FIG. 3. FIG. 5 to 7 are drawings showing the process of removing a lock cup of a cap screw using a lock cup removal device according to an embodiment of the present invention.

[0033] As illustrated in these drawings, one embodiment of the present invention is a lock cup removal device (100) for removing a lock cup of a cap screw that fixes a seal of an RCP (Reactor Coolant Pump), comprising: a holding plate (101) having a fixing hole (201) formed so that the lower part of a cap screw (CS), to which a lock cup (LC) is coupled to an upper head (H), is inserted and fixed; and a lock cup remover (103) that causes the lock cup (LC) to detach from the head (H) by an external force applied downward while in a fixed position in contact with the upper surface of the head (H).

[0034] The following describes each component.

[0035] Holding plate (101)

[0036] The holding plate (101) has a fixing hole (201) into which the lower part of the cap screw (CS) is inserted and fixed.

[0037] The diameter of the fixing hole (201) is determined to correspond to the size of the cap screw (CS) (e.g., M3, M5, etc.).

[0038] The cap screw (CS) has a structure in which a lock cup (LC) is coupled to the upper head (H).

[0039] Polygonal grooves, such as square or hexagonal ones, can be formed on the upper surface of the head (H).

[0040] The holding plate (101) may have, for example, a long box shape of a roughly rectangular prism.

[0041] The holding plate (101) may have a hole (105) for a handle on one side.

[0043] Lock cup remover (103)

[0044] The lock cup remover (103) causes the lock cup (LC) to detach from the head (H) by an external force applied downward while in a fixed position in contact with the upper surface of the head (H) of the cap screw (CS).

[0045] To explain in more detail an example of the configuration of the lock cup remover (103), the lock cup remover (103) comprises: a body (109) formed with a longitudinally movable guide groove (401) formed on the inner side and a hollow lock cup separating arm (107) protruding and extending from the lower side in communication with the movable guide groove (401); a rod (301) whose upper part passes through the lock cup separating arm (107) of the body (109) and is disposed within the movable guide groove (401), and whose lower part contacts the upper surface of the head (H) and moves up and down; and an elastic member (303) that elastically supports the upper part of the rod (301) within the movable guide groove (401); and causes the lock cup separating arm (107) to detach the lock cup (LC) from the head (H) by an external force applied downward to the body (109).

[0046] The body (109) may have a cylindrical shape, for example.

[0047] The body (109) has a movement guide groove (401) formed longitudinally on the inner side.

[0048] The body (109) has a structure formed by extending a hollow lock cup separator arm (107) that is connected to a moving guide groove (401) at the bottom.

[0049] The lock cup separator arm (107) may have a structure with an open side.

[0050] The body (109) may further include a limit step (403) that is formed protruding inwardly on the wall surface of the moving guide groove (401) to limit the withdrawal length of the rod (301) to be described later, and contacts the limit projection (305) of the rod (301).

[0051] The body (109) may further have a cover (309) that is fixed to the upper part by a fastening member (307).

[0052] The cover (309) supports the upper end of the elastic member (303) to be described later.

[0053] Next, the rod (301) is positioned in the moving guide groove (401) with its upper portion passing through the lock cup separation arm (107) of the body (109).

[0054] The rod (301) moves up and down with its lower part in contact with the upper surface of the head (H).

[0055] The lower part of the rod (301) can be supported by being fitted into a polygonal groove formed on the upper surface of the head (H).

[0056] The rod (301) may further include a limit projection (305) formed to protrude outwardly in the radial direction on the upper part.

[0057] The withdrawal length of the rod (301) is limited until the limit projection (305) comes into contact with the limit step (403).

[0058] Next, the elastic member (303) elastically supports the upper part of the rod (301) within the moving guide groove (401).

[0059] The elastic member (303) can be provided as, for example, a coil spring.

[0060] Referring to FIGS. 5 to 7, the process of separating a lock cup (LC) from the head (H) of a cap screw (CS) using a lock cup removal device (100) according to an embodiment of the present invention is described.

[0061] First, as shown in FIG. 5, the operator places the lock cup removal device (100) on the upper surface of the head (H) of the cap screw (CS) which is fitted and fixed in the fixing hole (201) of the holding plate (101).

[0062] At this time, the lower part of the rod (301) of the lock cup removal device (100) is fitted into the polygonal groove of the head (H).

[0063] Afterwards, as shown in FIG. 6, the operator applies a downward external force to the lock cup removal device (100) using a hammer or the like.

[0064] When a worker applies a downward external force to the lock cup removal device (100) using a hammer or the like, as shown in FIGS. 6 and 7, the lock cup separation arm (107) of the lock cup remover (103) separates the lock cup (LC) from the head (H) of the cap screw (CS).

[0066] As explained above, according to one embodiment of the present invention, damage to the threads of the cap screw can be prevented when removing the lock cup, the possibility of safety accidents caused by physical impact to the worker can be reduced, work efficiency can be improved by shortening the time required to remove the lock cup, and maintenance unit costs and maintenance productivity can be increased due to the reduction in maintenance time.

[0067] Although it has been described above that all components constituting an embodiment of the present invention are combined or operate as a single unit, the present invention is not necessarily limited to such an embodiment. That is, within the scope of the purpose of the present invention, all components may be selectively combined in one or more ways to operate.

[0068] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0070] 100 : Lock cup remover 101 : Holding plate 103 : Lock Cup Remover 105: Hole for handle 107 : Lock cup separator 109 : Body 201 : Fixing hole 301 : Load 303 : Elastic member 305 : Limit Break 307 : Fastening member 309 : Cover 401 : Transportation Guide Home 403 : Limit Step CS: Cap Screw H : Head LC : Lock cup

Claims

Claim 1 A device for removing a lock cup of a cap screw that fixes a seal of an RCP (Reactor Coolant Pump), comprising: a holding plate having a fixing hole formed therein so that the lower part of the cap screw, to which the lock cup is coupled, is inserted and fixed to the upper head; and a lock cup remover that causes the lock cup to detach from the head by an external force applied downward while in a fixed position in contact with the upper surface of the head. Claim 2 In claim 1, the lock cup remover comprises: a body formed with a longitudinally movable guide groove formed on the inner side and a hollow lock cup separating arm protruding and extending from the lower side in communication with the movable guide groove; a rod whose upper part passes through the lock cup separating arm of the body and is disposed within the movable guide groove, whose lower part contacts the upper surface of the head and moves up and down; and an elastic member that elastically supports the upper part of the rod within the movable guide groove; wherein the lock cup separating arm causes the lock cup to detach from the head by the external force applied downward to the body. Claim 3 A lock cup removal device according to claim 2, wherein the rod further includes a limit projection formed protruding outwardly in the radial direction on the upper part, and the body further includes a limit step formed protruding inwardly on the wall surface of the moving guide groove to contact the limit projection so as to limit the withdrawal length of the rod.

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