Foreign object gripping tool and foreign object gripping method
By designing the vibrating plate and extension rod structure of the foreign object grasping tool, the problem of steel wire pipe getting stuck or broken due to large turning angles between heat transfer tubes of steam generator was solved, and the foreign object was removed quickly and safely.
Patent Information
- Application Number
- CN202311566084.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-22
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2043-11-22
AI Technical Summary
In the existing technology, when a steel wire pipe is pulled out of the heat transfer tubes of a steam generator to remove a foreign object, it is easy to get stuck or break due to the large turning angle, resulting in failure to remove the foreign object.
A foreign object grasping tool was designed, including a first clamping member and a second clamping member. A vibrating plate is formed by two flanges and an extension rod. The vibrating plate drives the steel wire tube to shake to loosen the foreign object, and the extension rod pulls the foreign object out from between the heat transfer tubes to avoid turning.
It enables the rapid and safe removal of foreign objects from the heat transfer tubes, preventing the steel wire tubes from getting stuck or broken and reducing the generation of new foreign objects.
Smart Images
Figure CN117340917B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of nuclear power plant operation and maintenance technology, and in particular to a foreign object grasping tool and a foreign object grasping method. Background Technology
[0002] In nuclear power plants, steam generators are heat exchange devices that produce the steam needed for steam turbines. In nuclear reactors, the heat generated by nuclear fission is carried away by the coolant and transferred to the secondary loop working fluid through the steam generator, so that it produces steam with a certain temperature, pressure and dryness.
[0003] The heat transfer tubes of the steam generator in a nuclear power plant are the pressure boundary of the primary loop of the nuclear reactor. They require periodic flushing of secondary side deposited sludge and video inspections. Any foreign objects found during the inspections need to be removed promptly.
[0004] Four handholes are evenly spaced along the circumference of the steam generator cylinder. When removing foreign objects, a thin steel wire is typically inserted into the steam generator cylinder through one of the handholes. The pressing spring at the end of the steel wire is operated, and the foreign object is gripped by pliers at the front end of the steel wire. Then, the steel wire is pulled at the handhole to remove the foreign object.
[0005] However, within the steam generator shell, apart from the outer corridor between the heat transfer tube bundle and the shell, the only relatively spacious operable area is the central tube corridor (the space between the two opposing manholes at 0° and 180°). The remaining areas are densely packed with heat transfer tube bundles. Foreign objects typically reside between the heat transfer tubes. When using a thin steel wire to pull out foreign objects from between the heat transfer tubes, the object needs to be pulled from between the tubes into the central tube corridor, and then pulled out from the manhole from within the central tube corridor. During this process, the turning angle of the thin steel wire from between the heat transfer tubes to the central tube corridor is significant, sometimes reaching 90°, making it prone to jamming or even breakage, resulting in failed object removal.
[0006] Therefore, there is an urgent need for a foreign object grasping tool and method to solve the above problems. Summary of the Invention
[0007] The purpose of this invention is to provide a foreign object grasping tool and a foreign object grasping method to solve the technical problem in the prior art that the steel wire pipe is easily jammed or even broken when moving from the heat transfer pipe to the central pipe gallery due to the large turning angle during the process of pulling out foreign objects.
[0008] Based on the above concept, the technical solution adopted by this invention is as follows:
[0009] Foreign object grasping tools, including:
[0010] The first clamping element includes a first flange and a first extension rod disposed on the first flange, the first extension rod extending parallel to the axial direction of the first flange.
[0011] The second clamping member includes a second flange and a second extension rod disposed on the second flange, the second extension rod extending parallel to the axial direction of the second flange, and the first flange and the second flange being detachably connected;
[0012] A steel wire pipe, wherein the free end of the steel wire pipe is provided with a clamp;
[0013] The foreign object grasping tool is configured such that: the first flange and the second flange can respectively extend into the central tube gallery of the steam generator cylinder from two oppositely arranged hand holes and be connected to form a vibrating plate; the first flange and the second flange are connected to clamp the steel wire pipe; and the diameter of the vibrating plate is smaller than the inner diameter of the central tube gallery.
[0014] Optionally, the first flange is provided with a plurality of threaded connectors, which can be selectively connected to or disconnected from the second flange.
[0015] Optionally, the first flange is provided with an anti-loosening box corresponding to each of the threaded connectors, and the nut of the threaded connector is always located inside the anti-loosening box.
[0016] Optionally, the end of the anti-detachment box is provided with a screw-on opening, the diameter of which is smaller than the diameter of the nut of the threaded connector. The foreign object grasping tool also includes a screw-on component that can pass through the screw-on opening to screw on the nut of the threaded connector.
[0017] Optionally, the screwing component includes:
[0018] Turn the handle;
[0019] The extension rod is fixedly connected at one end to the screw handle;
[0020] A screwdriver is located at the other end of the extension rod, and the screwdriver is capable of passing through the screw-in hole and screwing the nut of the threaded connector.
[0021] Optionally, a plurality of the threaded connectors are arranged at equal intervals around the axis of the first flange.
[0022] Optionally, the second flange is provided with threaded holes that correspond one-to-one with the threaded connectors.
[0023] Optionally, the first extension rod is a hollow structure; and / or
[0024] The second extension rod has a hollow structure.
[0025] The foreign object removal method, which uses the aforementioned foreign object removal tool to remove foreign objects between the heat transfer tubes of the steam generator shell, includes the following steps:
[0026] S0. Control the steel wire tube to enter the steam generator cylinder from the first or second hand hole until the clamp at the free end of the steel wire tube clamps the foreign object. The second hand hole and the first hand hole are set opposite to each other.
[0027] S1. The first flange extends from the first handhole into the central tube gallery of the steam generator cylinder, and the free end of the first extension rod is located on the outside of the steam generator cylinder;
[0028] S2. The second flange extends from the second handhole into the central tube gallery of the steam generator cylinder, and the free end of the second extension rod is located on the outside of the steam generator cylinder;
[0029] S3. Control the first flange and the second flange to align and clamp the steel wire pipe;
[0030] S4. Operate the first extension rod and / or the second extension rod to make the wire tube vibrate;
[0031] S5. Rotate the first extension rod and / or the second extension rod so that the wire tube is wound around the vibrating plate, and pull the first extension rod or the second extension rod to remove the foreign object clamped by the wire tube.
[0032] Optionally, the foreign object grasping method further includes:
[0033] S6. After separating the first flange and the second flange, remove the first clamping member and the second clamping member from the steam generator cylinder.
[0034] The beneficial effects of this invention are:
[0035] The foreign object grasping tool proposed in this invention is used by first controlling a steel wire tube to enter the steam generator cylinder through either the first or second handhole until the clamp at the free end of the steel wire tube grasps the foreign object; at this point, both the clamp at the free end of the steel wire tube and the foreign object are located between the heat transfer tubes. Next, one operator controls the first flange to extend from the first handhole into the central tube gallery of the steam generator cylinder, with the free end of the first extension rod located on the outside of the steam generator cylinder. Another operator controls the second flange to extend from the second handhole into the central tube gallery of the steam generator cylinder, with the free end of the second extension rod located on the outside of the steam generator cylinder. Then, the first and second flanges are aligned and clamped onto the steel wire tube. Next, the first and second extension rods are operated to vibrate the steel wire tube. During this vibration, the foreign object is loosened, making it easier to pull the foreign object stuck between the heat transfer tubes out. After the foreign object is loosened by vibration, the first extension rod and / or the second extension rod are rotated to wind the wire tube around the vibrating plate. This operation ensures that when the clamp at the free end of the wire tube carries the foreign object to the central pipe rack, no turning is required. When the clamp at the free end of the wire tube carries the foreign object to the central pipe rack, the first or second extension rod is pulled, causing the foreign object held by the clamp to move outside the steam generator cylinder, allowing for rapid removal. During the process of the foreign object being held by the clamp along with the first or second extension rod outside the steam generator cylinder, the wire tube also does not need to turn, further ensuring rapid removal of the foreign object and preventing the formation of new foreign objects.
[0036] The foreign object grasping method proposed in this invention uses the aforementioned foreign object grasping tool to grasp foreign objects between the heat transfer tubes of the steam generator cylinder, ensuring that the foreign objects can be removed quickly and avoiding the generation of new foreign objects. Attached Figure Description
[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.
[0038] Figure 1 This is a schematic diagram of the first clamping member and the second clamping member provided in Embodiment 1 of the present invention in a connected state;
[0039] Figure 2 yes Figure 1 Enlarged view of point A in the middle;
[0040] Figure 3 This is a front view of the first clamping member provided in Embodiment 1 of the present invention;
[0041] Figure 4 This is a schematic diagram of the screwing component provided in Embodiment 1 of the present invention;
[0042] Figure 5 This is a flowchart of the foreign object grasping method provided in Embodiment 2 of the present invention.
[0043] In the picture:
[0044] 1. First clamping element; 11. First flange; 111. Threaded connector; 112. Anti-detachment box; 1121. Tightening opening; 12. First extension rod;
[0045] 2. Second clamping element; 21. Second flange; 22. Second extension rod;
[0046] 3. Steel wire pipe;
[0047] 4. Vibrating plate;
[0048] 5. Tightening parts; 51. Tightening handle; 52. Extension rod; 53. Screwdriver. Detailed Implementation
[0049] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.
[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.
[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.
[0052] Example 1
[0053] See Figures 1-4 This embodiment provides a foreign object grasping tool. This foreign object grasping tool can remove foreign objects between the heat transfer tubes of a steam generator cylinder.
[0054] Specifically, the steam generator cylinder contains numerous heat transfer tubes. After prolonged operation, foreign objects (such as screws) may fall into the steam generator cylinder, typically becoming lodged between the heat transfer tubes. When foreign objects are discovered during video inspection, they must be removed to ensure the normal operation of the steam generator cylinder.
[0055] To avoid the situation in existing technologies where steel wire tubes are used to remove foreign objects, and the steel wire tubes are clamped or broken due to the large turning angle when moving from the heat transfer tubes to the central tube gallery, thus becoming new foreign objects, this embodiment provides a foreign object grasping tool.
[0056] Generally, four handholes are evenly spaced along the circumference of the steam generator cylinder. For ease of description, the two handholes positioned opposite each other are referred to as the first handhole and the second handhole, respectively.
[0057] Specifically, in this embodiment, the foreign object grasping tool includes a first clamping member 1, a second clamping member 2, and a steel wire tube 3.
[0058] The first clamping member 1 includes a first flange 11 and a first extension rod 12 disposed on the first flange 11, the first extension rod 12 extending parallel to the axial direction of the first flange 11.
[0059] The second clamping member 2 includes a second flange 21 and a second extension rod 22 disposed on the second flange 21. The second extension rod 22 extends parallel to the axial direction of the second flange 21. The first flange 11 and the second flange 21 are detachably connected.
[0060] The free end of the steel wire pipe 3 is equipped with a clamp.
[0061] It should be noted that the clamp at the free end of the steel wire pipe 3 for grasping foreign objects is existing technology. Its structure and principle for grasping foreign objects are the same as those of existing sewer foreign object graspers, and will not be explained in detail here.
[0062] The foreign object grabbing tool is configured such that: the first flange 11 and the second flange 21 can respectively extend into the central tube gallery of the steam generator cylinder from two oppositely arranged hand holes and be connected to form a vibrating plate 4; the first flange 11 and the second flange 21 are connected to clamp the steel wire pipe 3; and the diameter of the vibrating plate 4 is smaller than the inner diameter of the central tube gallery.
[0063] In this embodiment, the foreign object grasping tool is used by first controlling the wire tube 3 to enter the steam generator cylinder through either the first or second handhole until the clamp at the free end of the wire tube 3 clamps the foreign object; at this point, both the clamp at the free end of the wire tube 3 and the foreign object are located between the heat transfer tubes. Next, one operator controls the first flange 11 to extend from the first handhole into the central tube gallery of the steam generator cylinder, with the free end of the first extension rod 12 located on the outside of the steam generator cylinder. Another operator controls the second flange 21 to extend from the second handhole into the central tube gallery of the steam generator cylinder, with the free end of the second extension rod 22 located on the outside of the steam generator cylinder. Then, the first flange 11 and the second flange 21 are aligned and clamped together. Then, operate the first extension rod 12 and / or the second extension rod 22 to make the vibrating plate 4 drive the wire tube 3 to vibrate. During the vibration, the wire tube 3 can loosen the foreign object, making it easier to pull the foreign object stuck between the heat transfer tubes out of the heat transfer tubes. After the foreign object is loosened, rotate the first extension rod 12 and / or the second extension rod 22 to make the wire tube 3 wind around the vibrating plate 4. By doing so, when the clamp at the free end of the wire tube 3 carries the foreign object to the central tube rack, it does not need to bend. When the clamp at the free end of the wire pipe 3 carries the foreign object to the central pipe gallery, it pulls the first extension rod 12 or the second extension rod 22, causing the foreign object clamped by the wire pipe 3 to move outside the steam generator cylinder, and quickly remove the foreign object. During the process of the foreign object clamped by the wire pipe 3 moving outside the steam generator cylinder with the first extension rod 12 or the second extension rod 22, the wire pipe 3 does not need to bend, further ensuring that the foreign object can be quickly removed and avoiding the generation of new foreign objects.
[0064] The diameter of the vibrating plate 4 is smaller than the inner diameter of the central tube gallery to prevent the vibrating plate 4 from contacting the heat transfer tube during the shaking process.
[0065] Specifically, in this embodiment, the first flange 11 is provided with a plurality of threaded connectors 111, which can be selectively connected to or separated from the second flange 21.
[0066] The presence of several threaded connectors 111 ensures the stability of the mating connection between the first flange 11 and the second flange 21.
[0067] Specifically, a number of threaded connectors 111 are arranged at equal intervals around the axis of the first flange 11.
[0068] Furthermore, the second flange 21 is provided with threaded holes that correspond one-to-one with the threaded connectors 111.
[0069] Furthermore, the first flange 11 is provided with an anti-detachment box 112 corresponding to the threaded connector 111, and the nut of the threaded connector 111 is always located inside the anti-detachment box 112.
[0070] The anti-detachment box 112 is designed to prevent the threaded connector 111 from detaching from the first flange 11, thereby preventing the threaded connector 111 from falling into the central pipe gallery and becoming a new foreign object during the process of grabbing foreign objects.
[0071] Furthermore, the end of the anti-detachment box 112 is provided with a screw-on opening 1121. The diameter of the screw-on opening 1121 is smaller than the diameter of the nut of the threaded connector 111. The foreign object grasping tool also includes a screw-on component 5, which can pass through the screw-on opening 1121 to screw on the nut of the threaded connector 111.
[0072] Specifically, when assembling the first clamping member 1, the threaded connector 111 is first installed onto the first flange 11, and then the anti-detachment box 112 is spot welded onto the first flange 11, with the nut of the threaded connector 111 located inside the anti-detachment box 112.
[0073] Specifically, in this embodiment, the screwing component 5 includes a screwing handle 51, an extension rod 52, and a screwdriver 53.
[0074] One end of the extension rod 52 is fixedly connected to the screw handle 51. A screwdriver 53 is provided at the other end of the extension rod 52, and the screwdriver 53 can pass through the screw hole 1121 and screw the nut of the threaded connector 111.
[0075] Specifically, in this embodiment, the nut of the threaded connector 111 is provided with a slot, and the screwdriver 53 is a slotted screwdriver.
[0076] Specifically, when the first flange 11 and the second flange 21 are connected, the operator holds the screwdriver handle 51 and inserts the screwdriver 53 into the central pipe rack through the first hand hole. After the screwdriver 53 is inserted into the central pipe rack through the first hand hole, the screwdriver 53 passes through the screwdriver opening 1121 and screws the nut of the threaded connector 111, so that the threaded connector 111 is screwed into the second flange 21.
[0077] When separating the first flange 11 and the second flange 21, the operator holds the screwdriver handle 51 and inserts the screwdriver 53 into the central pipe rack through the first hand hole. After the screwdriver 53 is inserted into the central pipe rack through the first hand hole, the screwdriver 53 passes through the screwdriver opening 1121 and screws the nut of the threaded connector 111, so that the threaded connector 111 is removed from the second flange 21. At this time, one operator holds the first extension rod 12 and removes the first clamping member 1 from the first hand hole; another operator holds the second extension rod 22 and removes the second clamping member 2 from the second hand hole.
[0078] It is understood that in this embodiment, the diameters of both the first flange 11 and the second flange 21 are smaller than the diameter of the handhole; the sum of the diameters of the first extension rod 12 and the extension rod 52 is smaller than the diameter of the handhole. Preferably, the diameters of the first flange 11 and the second flange 21 are the same.
[0079] Preferably, in this embodiment, the first extension rod 12 is a hollow structure; and / or
[0080] The second extension rod 22 is a hollow structure.
[0081] Specifically, in this embodiment, the first extension rod 12 is a hollow structure and the second extension rod 22 is a hollow structure, so as to reduce the overall weight of the foreign object grasping tool and facilitate the operation of the operator.
[0082] Example 2
[0083] See Figure 5 This embodiment provides a foreign object grabbing method, which uses the foreign object grabbing tool of Embodiment 1 to grab foreign objects between the heat transfer tubes of a steam generator cylinder, including the following steps:
[0084] S0. Control the wire tube 3 to enter the steam generator cylinder from the first or second hand hole until the clamp at the free end of the wire tube 3 clamps the foreign object. The second hand hole and the first hand hole are set opposite to each other.
[0085] S1. The first flange 11 extends from the first handhole into the central pipe gallery of the steam generator cylinder, and the free end of the first extension rod 12 is located on the outside of the steam generator cylinder.
[0086] S2. The second flange 21 extends from the second handhole into the central pipe gallery of the steam generator shell, and the free end of the second extension rod 22 is located on the outside of the steam generator shell.
[0087] S3, control the first flange 11 and the second flange 21 to mate and clamp the steel wire pipe 3;
[0088] S4. Operate the first extension rod 12 and / or the second extension rod 22 to make the wire tube 3 vibrate; specifically, shake the first extension rod 12 and / or the second extension rod 22 to drive the vibrating plate 4 to shake, thereby driving the wire tube 3 to vibrate; when the wire tube 3 vibrates, it can loosen the foreign object stuck in the heat transfer tube, making it easier to pull out the foreign object.
[0089] S5. Rotate the first extension rod 12 and / or the second extension rod 22 so that the wire tube 3 is wound around the vibrating plate 4, and pull the first extension rod 12 or the second extension rod 22 to remove the foreign object clamped by the clamp of the wire tube 3.
[0090] In the actual operation of the foreign object grasping method provided in this embodiment, the steel wire tube 3 is first controlled to enter the steam generator cylinder through the first or second handhole until the clamp at the free end of the steel wire tube 3 clamps the foreign object; at this time, both the clamp at the free end of the steel wire tube 3 and the foreign object are between the heat transfer tubes. Next, one operator controls the first flange 11 to extend into the central tube gallery of the steam generator cylinder through the first handhole, with the free end of the first extension rod 12 located on the outside of the steam generator cylinder. Another operator controls the second flange 21 to extend into the central tube gallery of the steam generator cylinder through the second handhole, with the free end of the second extension rod 22 located on the outside of the steam generator cylinder. Then, the first flange 11 and the second flange 21 are controlled to align and clamp the steel wire tube 3. Then, operate the first extension rod 12 and / or the second extension rod 22 to make the vibrating plate 4 drive the wire tube 3 to vibrate. During the vibration, the wire tube 3 can loosen the foreign object, making it easier to pull the foreign object stuck between the heat transfer tubes out of the heat transfer tubes. After the foreign object is loosened, rotate the first extension rod 12 and / or the second extension rod 22 to make the wire tube 3 wind around the vibrating plate 4. By doing so, when the clamp at the free end of the wire tube 3 carries the foreign object to the central tube rack, it does not need to bend. When the clamp at the free end of the wire pipe 3 carries the foreign object to the central pipe gallery, it pulls the first extension rod 12 or the second extension rod 22, causing the foreign object clamped by the wire pipe 3 to move outside the steam generator cylinder, and quickly remove the foreign object. During the process of the foreign object clamped by the wire pipe 3 moving outside the steam generator cylinder with the first extension rod 12 or the second extension rod 22, the wire pipe 3 does not need to bend, further ensuring that the foreign object can be quickly removed and avoiding the generation of new foreign objects.
[0091] Furthermore, in this embodiment, the foreign object grasping method also includes:
[0092] S6. After separating the first flange 11 and the second flange 21, remove the first clamping member 1 and the second clamping member 2 from the steam generator cylinder.
[0093] Specifically, in step S6, the operator holds the screwdriver handle 51 and inserts the screwdriver 53 into the central tube rack through the first hand hole. After the screwdriver 53 is inserted into the central tube rack through the first hand hole, the screwdriver 53 passes through the screwdriver opening 1121 and screws the nut of the threaded connector 111, so that the threaded connector 111 leaves the second flange 21. At this time, one operator holds the first extension rod 12 and pulls the first clamping member 1 out of the first hand hole; another operator holds the second extension rod 22 and pulls the second clamping member 2 out of the second hand hole.
[0094] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A foreign object grasping tool, characterized in that, include: The first clamping member (1) includes a first flange (11) and a first extension rod (12) disposed on the first flange (11), the first extension rod (12) extending parallel to the axial direction of the first flange (11); The second clamping member (2) includes a second flange (21) and a second extension rod (22) disposed on the second flange (21). The second extension rod (22) extends parallel to the axial direction of the second flange (21). The first flange (11) and the second flange (21) are detachably connected. A steel wire tube (3) is provided with a clamp at its free end; The foreign object grasping tool is configured such that: the clamp is used to grasp foreign objects between the heat transfer tubes of the steam generator cylinder; the first flange (11) and the second flange (21) can respectively extend into the central tube gallery of the steam generator cylinder from two oppositely arranged hand holes and be connected to form a vibrating plate (4); the first flange (11) and the second flange (21) are connected to clamp the steel wire tube (3); by rotating the first extension rod (12) and / or the second extension rod (22), the steel wire tube (3) can be wound around the vibrating plate (4), so that the clamp carries the foreign object from between the heat transfer tubes to the central tube gallery; the diameter of the vibrating plate (4) is smaller than the inner diameter of the central tube gallery.
2. The foreign object grasping tool according to claim 1, characterized in that, The first flange (11) is provided with a plurality of threaded connectors (111), which can be selectively connected to or separated from the second flange (21).
3. The foreign object grasping tool according to claim 2, characterized in that, The first flange (11) is provided with an anti-detachment box (112) corresponding to the threaded connector (111) one by one, and the nut of the threaded connector (111) is always located inside the anti-detachment box (112).
4. The foreign object grasping tool according to claim 3, characterized in that, The end of the anti-detachment box (112) is provided with a screw-on opening (1121), the diameter of which is smaller than the diameter of the nut of the threaded connector (111). The foreign object grasping tool also includes a screw-on component (5), which can pass through the screw-on opening (1121) to screw the nut of the threaded connector (111).
5. The foreign object grasping tool according to claim 4, characterized in that, The screwing component (5) includes: Tighten the handle (51); One end of the extension rod (52) is fixedly connected to the screw handle (51); A screwdriver (53) is provided at the other end of the extension rod (52), which can pass through the screw hole (1121) and screw the nut of the threaded connector (111).
6. The foreign object grasping tool according to claim 2, characterized in that, Several threaded connectors (111) are arranged at equal intervals around the axis of the first flange (11).
7. The foreign object grasping tool according to claim 6, characterized in that, The second flange (21) is provided with threaded holes that correspond one-to-one with the threaded connector (111).
8. The foreign object grasping tool according to any one of claims 1-7, characterized in that, The first extension rod (12) is a hollow structure; and / or The second extension rod (22) is a hollow structure.
9. A method for grasping foreign objects, characterized in that, The method of using the foreign object grasping tool as described in any one of claims 1-8 to grasp foreign objects between the heat transfer tubes of a steam generator cylinder includes the following steps: S0. Control the wire tube (3) to enter the steam generator cylinder from the first hand hole or the second hand hole until the clamp at the free end of the wire tube (3) clamps the foreign object. The second hand hole and the first hand hole are set opposite to each other. S1. The first flange (11) extends from the first handhole into the central tube gallery of the steam generator cylinder, and the free end of the first extension rod (12) is located on the outside of the steam generator cylinder; S2, The control second flange (21) extends from the second hand hole into the central tube gallery of the steam generator cylinder, and the free end of the second extension rod (22) is located on the outside of the steam generator cylinder; S3. Control the first flange (11) and the second flange (21) to mate and clamp the steel wire pipe (3); S4. Operate the first extension rod (12) and / or the second extension rod (22) to make the wire tube (3) vibrate; S5. Rotate the first extension rod (12) and / or the second extension rod (22) so that the wire tube (3) is wound around the vibrating plate (4), and pull the first extension rod (12) or the second extension rod (22) to remove the foreign object clamped by the wire tube (3).
10. The foreign object grasping method according to claim 9, characterized in that, The foreign object grasping method also includes: S6. After separating the first flange (11) and the second flange (21), remove the first clamping member (1) and the second clamping member (2) from the steam generator cylinder.
Citation Information
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