Device for leaking stoppage of nuclear power plant

Abstract

The utility model relates to the technical field of nuclear power plant accident emergency, and discloses a nuclear power plant leaking stoppage device which is used for pressing a leaking stoppage patch to a leaking point of equipment to be subjected to leaking stoppage. The executing mechanism is connected with the positioning mechanism and used for pressing a leaking stoppage patch, and the connecting mechanism is connected with the positioning mechanism and used for being connected with equipment to be subjected to leaking stoppage. The executing mechanism comprises a transmission rod which is installed on the positioning mechanism and can move in the height direction of the positioning mechanism, a driving piece which is in driving connection with the transmission rod, a moving shaft which is in transmission connection with the transmission rod, and an auxiliary jacking rod which is connected to the moving shaft and used for making contact with the leaking stoppage patch. The device for the leakage stoppage of the nuclear power plant can effectively solve the problem that leakage points cannot be completely eliminated at a time in the past under-pressure leakage stoppage process, the safety of personnel can be guaranteed in the overhaul process, the overhaul efficiency is greatly improved, the device is simple in structure and high in practical value, the labor intensity of operators is reduced, and the safety risk in the leakage stoppage overhaul process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant accident emergency response, in particular to a leakage plugging device for a nuclear power plant. Background Art

[0002] During the operation of nuclear power units, various load-bearing welds in the system and various pumps, valves, container equipment bodies, etc. are affected by manufacturing quality, erosion, vibration, corrosion and other factors, causing defects to expand and penetrate, and then cause leakage of varying degrees. Eliminating such defects often requires isolating and emptying the medium at the leakage location, which is bound to seriously affect the availability of equipment and systems, and to a certain extent affect the safety of nuclear power unit operation. At present, the main methods of plugging leaks in the operation of nuclear power plants in service are caulking, riveting, or using glue sticks, metal tapes, metal repair agents, etc., but these methods often have unstable quality and insufficient strength, and may even aggravate the degree of leakage, bringing great hidden dangers to equipment and personnel, especially when the system pressure is high and the leakage point cannot be completely eliminated, and there will be sudden safety incidents in subsequent operation. At present, a plugging patch is used for plugging, and a special device is required to press the plugging patch on the equipment that needs to be plugged. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a leakage plugging device for a nuclear power plant.

[0004] The technical solution adopted by the utility model to solve the technical problem is: construct a nuclear power plant plugging device, which is used to press a plugging patch onto the leak point of the equipment to be plugged, and includes a positioning mechanism, an actuator connected to the positioning mechanism and used to press the plugging patch, and a connecting mechanism connected to the positioning mechanism and used to connect to the equipment to be plugged;

[0005] The actuator includes a transmission rod installed on the positioning mechanism and movable along the height direction of the positioning mechanism, a driving member drivingly connected to the transmission rod, a motion shaft drivingly connected to the transmission rod, and an auxiliary tightening rod connected to the motion shaft and used to contact the leak-proof patch.

[0006] In some embodiments, the positioning mechanism includes a first positioning plate and a second positioning plate spaced apart from the first positioning plate, and the first positioning plate and the second positioning plate are connected via a fixing member;

[0007] The driving member is located above the first positioning plate. A first thrust bearing and a first gasket are provided between the driving member and the first positioning plate. The first gasket is located between the first thrust bearing and the driving member.

[0008] In some embodiments, a first fastener is provided on a side of the driving member facing away from the first positioning plate, a second fastener is provided below the first positioning plate, the first fastener cooperates with the second fastener to fix the driving member on the first positioning plate, and a second thrust bearing is provided between the second fastener and the first positioning plate;

[0009] A second gasket is provided between the second thrust bearing and the second fastener.

[0010] In some embodiments, an auxiliary limiting block is welded below the second positioning plate, and a limiting top screw is provided on the auxiliary limiting block;

[0011] The moving shaft is passed through the second positioning plate and the auxiliary limiting block, and a limiting groove matching the limiting top screw is provided on the circumferential side of the moving shaft. The limiting groove has a limiting wall for abutting against the limiting top screw, and the width of the limiting groove matches the diameter of the limiting top screw.

[0012] In some embodiments, the positioning mechanism further includes a first support rod and a second support rod connected to the second positioning plate, and the first support rod and the second support rod are both connected to the second positioning plate via a third fastener.

[0013] In some embodiments, the connection mechanism includes a rotating shaft fixedly connected to the first support rod, a sleeve sleeved outside the rotating shaft, and a base fixedly connected to the sleeve;

[0014] The base is provided with a through slot for the second support rod to pass through, and one end of the second support rod away from the second positioning plate is connected to the base via a fourth fastener.

[0015] In some embodiments, a positioning piece is provided on the base, and a positioning groove is provided on the positioning piece that matches the shape of the equipment to be plugged. The positioning piece is connected to the base through a fifth fastener, and a strip hole is opened on the base for the fifth fastener to pass through.

[0016] In some embodiments, a clamping member for abutting against the device to be plugged is detachably connected to the base, and the clamping member is connected to the base via a sixth fastener.

[0017] In some embodiments, a spherical portion is disposed on one end of the first support rod and one end of the second support rod away from the second positioning plate.

[0018] In some embodiments, the connection mechanism includes a plurality of support feet for connecting to the equipment to be plugged, the plurality of support feet are respectively connected to the first support rod and the second support rod, the support feet are provided with a connected tapered groove and a connecting hole, one end of the rod body of the first support rod and one end of the rod body of the second support rod are both installed in the tapered groove, and the spherical portion is installed in the connecting hole;

[0019] The diameter of the bottom of the tapered groove is smaller than the diameter of the spherical portion, the diameter of the bottom of the tapered groove is larger than the diameter of the rod body of the first support rod or the second support rod, and the diameter of the connecting hole is larger than the diameter of the spherical portion.

[0020] The implementation of the utility model has the following beneficial effects: the nuclear power plant plugging device can effectively solve the problem that the previous pressure plugging cannot completely eliminate the leakage point at one time, avoid production interruption and the negative impact on personnel safety, personnel safety can be guaranteed during the maintenance process, and the maintenance efficiency is greatly improved. It has a simple structure and high practical value, reduces the labor intensity of operators, and avoids safety risks during the plugging and maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 It is a schematic diagram of the application of the nuclear power plant leakage plugging device in some embodiments of the utility model;

[0023] Figure 2 It is a three-dimensional structural diagram of a first embodiment of a nuclear power plant leakage plugging device in some embodiments of the utility model;

[0024] Figure 3 It is a three-dimensional structural diagram of another direction of the first embodiment of the nuclear power plant leakage plugging device in some embodiments of the utility model;

[0025] Figure 4 It is a three-dimensional structural diagram of the positioning mechanism and the connecting mechanism of the nuclear power plant leakage plugging device in some embodiments of the utility model;

[0026] Figure 5 It is a three-dimensional structural diagram of the connection mechanism of the first embodiment of the nuclear power plant plugging device in some embodiments of the utility model;

[0027] Figure 6It is a three-dimensional structural diagram of a second embodiment of a nuclear power plant leakage plugging device in some embodiments of the utility model;

[0028] Figure 7 It is a structural diagram of the support foot of the second embodiment of the nuclear power plant plugging device in some embodiments of the utility model;

[0029] Figure 8 It is a schematic cross-sectional structural diagram of the connection between the support foot and the support rod of the second embodiment of the nuclear power plant leakage plugging device in some embodiments of the utility model. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0031] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0032] See also Figures 1 to 8 , is a nuclear power plant plugging device in some embodiments of the utility model, which is used to press the plugging patch 5 onto the leak point of the equipment to be plugged 6. More specifically, as Figure 1As shown, the nuclear power plant plugging device can be used when the equipment to be plugged 6 leaks and needs to be repaired online. It can effectively solve the problem that the previous pressure plugging cannot completely eliminate the leakage point at one time. It needs to be used with a special plugging patch 5.

[0033] The nuclear power plant plugging device may include a positioning mechanism 1, an actuator 2 connected to the positioning mechanism 1 and used to compress the plugging patch 5, and a connecting mechanism 3 connected to the positioning mechanism 1 and used to connect to the equipment 6 to be plugged. The actuator 2 includes a transmission rod 21 installed on the positioning mechanism 1 and movable along the height direction of the positioning mechanism 1, a driving member 22 driven by the transmission rod 21, a moving shaft 23 driven by the transmission rod 21, and an auxiliary tightening rod 24 connected to the moving shaft 23 and used to contact the plugging patch 5.

[0034] like Figure 2 and Figure 3 As shown, the positioning mechanism 1 can be used as a positioning support, the transmission rod 21 can be a rotating screw, and the driving member 22 can be a driving handle, which has a threaded portion matching the rotating screw. When the driving handle is rotated, the rotating screw rotates accordingly, so that the rotating screw can move up and down along the height direction of the positioning mechanism 1. In some other embodiments, a cylinder, a hydraulic cylinder or an electric product can also be used as a driving member to drive the rotating screw to move.

[0035] In addition, the motion shaft 23 is a hollow cylindrical structure, which cooperates with the transmission rod 21 through an internal thread, so that the motion shaft 23 can move with the movement of the transmission rod 21. Further, the auxiliary tightening rod 24 can be connected to the motion shaft 23 through a thread, or can be connected through a fastener. The auxiliary tightening rod 24 can be replaced according to the actual situation on site or the specifications of the plugging patch 5. The auxiliary tightening rod 24 moves synchronously with the motion shaft 23. The end of the auxiliary tightening rod 24 facing away from the motion shaft 23 is used to abut against the plugging patch 5. The auxiliary tightening rod 24 provides a pressing force for the plugging patch 5 through the movement of the motion shaft 23. When the nuclear power plant plugging device is used, the auxiliary tightening rod 24 can press the plugging patch 5 by rotating the driving member 22.

[0036] like Figure 4As shown, the positioning mechanism 1 includes a first positioning plate 11 and a second positioning plate 12 spaced apart from the first positioning plate 11. The first positioning plate 11 and the second positioning plate 12 are connected by a fixing member 13, and the first positioning plate 11 and the second positioning plate 12 are welded to the fixing member 13. The driving member 22 is located above the first positioning plate 11. A first thrust bearing 41 and a first gasket 42 are provided between the driving member 22 and the first positioning plate 11. The first gasket 42 is located between the first thrust bearing 41 and the driving member 22. The transmission rod 21 is penetrated by the first thrust bearing 41. The function of the first thrust bearing 41 is to bear the axial thrust of the transmission rod 21 during operation, determine and maintain the relative position between the transmission rod 21 and the first positioning plate 11. The first gasket 42 can provide appropriate protection to facilitate the rotation of the driving member 22.

[0037] In addition, a first fastener 43 is provided on the side of the driving member 22 away from the first positioning plate 11, and a second fastener 44 is provided below the first positioning plate 11. The first fastener 43 cooperates with the second fastener 44 to fix the driving member 22 on the first positioning plate 11, and a second thrust bearing 45 is provided between the second fastener 44 and the first positioning plate 11, and a second gasket 46 is provided between the second thrust bearing 45 and the second fastener 44. The first fastener 43 and the second fastener 44 can both be fastening nuts, and the function of the second thrust bearing 45 is to bear the axial thrust of the transmission rod 21 during operation, determine and maintain the relative position between the transmission rod 21 and the first positioning plate 11, and the second gasket 46 can provide appropriate protection to facilitate the rotation of the driving member 22.

[0038] like Figure 4 As shown, an auxiliary limit block 121 is welded under the second positioning plate 12, and a limit top screw 122 is provided on the auxiliary limit block 121. The auxiliary limit block 121 is roughly a cylindrical hollow structure, which is used to assist in limiting the movement direction of the moving shaft 23 so that the moving shaft 23 can only move along the height direction of the positioning mechanism 1. In addition, the limit top screw 122 is located on the side of the auxiliary limit block 121, and is threadedly connected to the auxiliary limit block 121. The moving shaft 23 is passed through the second positioning plate 12 and the auxiliary limiting block 121. A limiting groove 231 matching the limiting top screw 122 is provided on the circumferential side of the moving shaft 23. The limiting groove 231 has a limiting wall 232 for abutting against the limiting top screw 122. The setting of the limiting wall 232 can prevent the moving shaft 23 from escaping from the second positioning plate 12, and the width of the limiting groove 231 matches the diameter of the limiting top screw 122. When the limiting top screw 122 is placed in the limiting groove 231, the free rotation of the moving shaft 23 can be limited.

[0039] like Figure 2As shown, the positioning mechanism 1 also includes a first support rod 25 and a second support rod 26 connected to the second positioning plate 12, and the first support rod 25 and the second support rod 26 are connected to the second positioning plate 12 through a third fastener 27, and the first support rod 25 and the second support rod 26 are arranged along the height direction of the positioning mechanism 1. In this embodiment, the number of the first support rod 25 and the second support rod 26 are both two, and the four support rods are evenly arranged at the four corners of the second positioning plate 12. In some other embodiments, the number of the first support rod 25 and the second support rod 26 can be two or more, which can be adjusted according to actual conditions. The first support rod 25 and the second support rod 26 can be screw rods, which can be used to adjust the distance between the second positioning plate 12 and the connecting mechanism 3.

[0040] Furthermore, since there may be equipment 6 with different calibers to be plugged during on-site operations, in this embodiment, two different structural forms of connecting mechanisms 3 are provided for small-caliber equipment and large-caliber equipment respectively, which can be switched according to actual on-site requirements.

[0041] like Figures 2 to 5 As shown, the first type of the connecting mechanism 3 is designed for small-caliber equipment, as shown in FIG. Figure 5 As shown, the connection mechanism 3 may include a rotating shaft 31 fixedly connected to the first support rod 25, a sleeve 32 sleeved on the outside of the rotating shaft 31, and a base 33 fixedly connected to the sleeve 32. The rotating shaft 31 can be welded to the two first support rods 25 at the same time, and the sleeve 32 and the base 33 are welded as one, so that the base 33 can have a rotating function. In addition, a through groove 331 for the second support rod 26 to pass through is provided on the base 33, and the through groove 331 extends to the outer wall surface of the base 33. The end of the second support rod 26 away from the second positioning plate 12 is connected to the base 33 through the fourth fastener 28. When the base 33 is positioned, the operator can rotate the base 33 so that the base 33 and the second positioning plate 12 are in a parallel position, and then the base 33 and the second support rod 26 are fixed together through the fourth fastener 28.

[0042] Among them, a positioning member 34 is provided on the base 33, and a positioning groove 341 matching the shape of the device 6 to be plugged is provided on the positioning member 34, and the positioning groove 341 is preferably an arc groove matching the shape of the pipeline, and the positioning groove 341 provides a certain stable support for the connection mechanism 3 when clamping the device 6 to be plugged, and the positioning member 34 is connected to the base 33 through a fifth fastener 35, and a screw rod can be welded on the lower side of the positioning member 34, and the fifth fastener 35 can be threadedly connected to the screw rod. In addition, the number of the positioning members 34 is preferably two, and a strip hole 332 for the fifth fastener 35 to pass through is opened on the base 33, and the strip hole 332 is arranged along the length direction of the base 33, which can facilitate the position adjustment of the positioning member 34.

[0043] The base 33 is detachably connected with a clamping member 36 for abutting against the device 6 to be plugged, and the clamping member 36 is connected to the base 33 through a sixth fastener 37. The number of the clamping members 36 is preferably two, which are roughly U-shaped, and the two clamping members 36 act together and are clamped on the device 6 to be plugged.

[0044] It can be understood that when the nuclear power plant plugging device is applied to small-caliber equipment, its use method is as follows:

[0045] 1. Preliminarily determine the installation position of the nuclear power plant plugging device, loosen the two second support rods 26, loosen the clamping member 36, and place the base 33 on the equipment to be plugged 6. The leakage point of the equipment to be plugged 6 should be located at the center of the base 33 as much as possible;

[0046] 2. Install the clamping member 36 and tighten the sixth fastener 37, and then tighten the other fasteners, so that the entire nuclear power plant plugging device is clamped on the equipment to be plugged 6;

[0047] 3. Place the assembled plugging patch 5 together with the sealing gasket at the leaking point;

[0048] 4. Rotate the driving member 22 to make the auxiliary tightening rod 24 tighten the plugging patch 5 until the medium in the equipment to be plugged 6 stops leaking, and then use welding technology to weld the plugging patch 5 to the equipment to be plugged 6 on all sides. At this time, the leak point is completely eliminated.

[0049] like Figure 6 As shown, the second type of the connecting mechanism 3 is designed for large-caliber equipment, and can also be used for small-caliber equipment in some cases. The structures of the first support rod 25 and the second support rod 26 are also changed, such as Figure 8 As shown, the first support rod 25 and the second support rod 26 are both provided with a spherical portion 251 on one end away from the second positioning plate 12, and the spherical portion 251 can be welded to the first support rod 25 or the second support rod 26, or can be detachably connected. The connection mechanism 3 includes a plurality of support feet 38 for connecting to the equipment to be plugged 6, and the plurality of support feet 38 are respectively connected to the first support rod 25 and the second support rod 26, and the support feet 38 are provided with a connected tapered groove 381 and a connecting hole 382, ​​and one end of the rod body of the first support rod 25 and one end of the rod body of the second support rod 26 are both installed in the tapered groove 381, and the spherical portion 251 is installed in the connecting hole 382.

[0050] Furthermore, the diameter of the bottom of the tapered groove 381 is smaller than the diameter of the spherical portion 251, the diameter of the bottom of the tapered groove 381 is larger than the diameter of the rod body of the first support rod 25 or the second support rod 26, and the diameter of the connecting hole 382 is larger than the diameter of the spherical portion 251. It can be understood that during assembly, the spherical portion 251 can be placed in the connecting hole 382 first, and then the first support rod 25 or the second support rod 26 can be placed in the tapered groove 381, and then the spherical portion 251 is connected to the first support rod 25 or the second support rod 26. The provision of the tapered groove 381 and the connecting hole allows the support foot 38 to have a larger movable space relative to the first support rod 25 or the second support rod 26, so that the support foot 38 can adapt to the operation of various caliber equipment, and also prevents the support foot 38 from slipping out of the first support rod 25 or the second support rod 26, thereby ensuring the stability of the connection. In addition, the support leg 38 can be welded to the equipment 6 to be plugged, and the nuclear power plant plugging device can be fixed as a whole to the equipment 6 to be plugged.

[0051] It can be understood that when the nuclear power plant plugging device is applied to large-caliber equipment, its use method is as follows:

[0052] 1. Preliminarily determine the installation position of the nuclear power plant plugging device, weld the support foot 38 to the equipment to be plugged 6, and the leakage point of the equipment to be plugged 6 should be located at the center of the base 33 as much as possible;

[0053] 2. Tighten the fasteners on the nuclear power plant plugging device to ensure that the entire nuclear power plant plugging device is firmly connected;

[0054] 3. Place the assembled plugging patch 5 together with the sealing gasket at the leaking point;

[0055] 4. Rotate the driving member 22 to make the auxiliary tightening rod 24 tighten the plugging patch 5 until the medium in the equipment to be plugged 6 stops leaking, and then use welding technology to weld the plugging patch 5 to the equipment to be plugged 6 on all sides. At this time, the leak point is completely eliminated.

[0056] The beneficial effects of the nuclear power plant plugging device are as follows: the nuclear power plant plugging device can effectively solve the problem that the previous pressure plugging cannot completely eliminate the leakage point at one time, avoid production interruption and negative impact on personnel safety, personnel safety can be guaranteed during maintenance, and maintenance efficiency is greatly improved. It has a simple structure and high practical value, reduces the labor intensity of operators, and avoids safety risks during plugging and maintenance.

[0057] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A leak plugging device for a nuclear power plant, which is used to press a leak plugging patch (5) onto a leak point of a device to be plugged (6), characterized in that: It comprises a positioning mechanism (1), an actuator (2) connected to the positioning mechanism (1) and used for pressing a leak-blocking patch (5), and a connecting mechanism (3) connected to the positioning mechanism (1) and used for connecting to a leak-blocking device (6); The actuator (2) comprises a transmission rod (21) mounted on the positioning mechanism (1) and movable in the height direction of the positioning mechanism (1), a driving member (22) drivingly connected to the transmission rod (21), a motion shaft (23) drivingly connected to the transmission rod (21), and an auxiliary tightening rod (24) connected to the motion shaft (23) and used to contact the leak-proof patch (5).

2. The nuclear power plant leak plugging device according to claim 1, characterized in that: The positioning mechanism (1) comprises a first positioning plate (11) and a second positioning plate (12) spaced apart from the first positioning plate (11); the first positioning plate (11) and the second positioning plate (12) are connected via a fixing member (13); The driving member (22) is located above the first positioning plate (11), a first thrust bearing (41) and a first gasket (42) are provided between the driving member (22) and the first positioning plate (11), and the first gasket (42) is located between the first thrust bearing (41) and the driving member (22).

3. The nuclear power plant leak plugging device according to claim 2, characterized in that: A first fastener (43) is provided on the side of the driving member (22) facing away from the first positioning plate (11), a second fastener (44) is provided below the first positioning plate (11), the first fastener (43) cooperates with the second fastener (44) to fix the driving member (22) on the first positioning plate (11), and a second thrust bearing (45) is provided between the second fastener (44) and the first positioning plate (11); A second gasket (46) is provided between the second thrust bearing (45) and the second fastener (44).

4. The nuclear power plant leak plugging device according to claim 2, characterized in that: An auxiliary limiting block (121) is welded below the second positioning plate (12), and a limiting top screw (122) is provided on the auxiliary limiting block (121); The moving shaft (23) is passed through the second positioning plate (12) and the auxiliary limiting block (121); a limiting groove (231) matching the limiting top screw (122) is provided on the circumferential side of the moving shaft (23); the limiting groove (231) has a limiting wall (232) for abutting against the limiting top screw (122); and the width of the limiting groove (231) matches the diameter of the limiting top screw (122).

5. The nuclear power plant leak plugging device according to claim 2, characterized in that: The positioning mechanism (1) further comprises a first support rod (25) and a second support rod (26) connected to the second positioning plate (12); the first support rod (25) and the second support rod (26) are both connected to the second positioning plate (12) via a third fastener (27).

6. The nuclear power plant leak plugging device according to claim 5, characterized in that: The connecting mechanism (3) comprises a rotating shaft (31) fixedly connected to the first supporting rod (25), a shaft sleeve (32) sleeved on the outside of the rotating shaft (31), and a base (33) fixedly connected to the shaft sleeve (32); The base (33) is provided with a through slot (331) for the second support rod (26) to pass through, and one end of the second support rod (26) away from the second positioning plate (12) is connected to the base (33) via a fourth fastener (28).

7. The nuclear power plant leak plugging device according to claim 6, characterized in that: The base (33) is provided with a positioning piece (34), the positioning piece (34) is provided with a positioning groove (341) matching the shape of the device (6) to be plugged, the positioning piece (34) is connected to the base (33) via a fifth fastener (35), and the base (33) is provided with a strip hole (332) for the fifth fastener (35) to pass through.

8. The nuclear power plant leak plugging device according to claim 6, characterized in that: The base (33) is detachably connected with a clamping member (36) for abutting against the device (6) to be plugged, and the clamping member (36) is connected to the base (33) via a sixth fastener (37).

9. The nuclear power plant leak plugging device according to claim 5, characterized in that: A spherical portion (251) is provided on one end of the first support rod (25) and the second support rod (26) away from the second positioning plate (12).

10. The nuclear power plant leak plugging device according to claim 9, characterized in that: The connecting mechanism (3) comprises a plurality of supporting feet (38) for connecting to the equipment (6) to be plugged, the plurality of supporting feet (38) being connected to the first supporting rod (25) and the second supporting rod (26), respectively, the supporting feet (38) being provided with a communicating conical groove (381) and a connecting hole (382), one end of the rod body of the first supporting rod (25) and one end of the rod body of the second supporting rod (26) being installed in the conical groove (381), and the spherical portion (251) being installed in the connecting hole (382); The diameter of the bottom of the conical groove (381) is smaller than the diameter of the spherical portion (251), the diameter of the bottom of the conical groove (381) is larger than the diameter of the rod body of the first support rod (25) or the second support rod (26), and the diameter of the connecting hole (382) is larger than the diameter of the spherical portion (251).

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