A pneumatic wrench for rotating a main nut in a pressurized water reactor nuclear power plant

Abstract

This invention relates to the field of nuclear power plant maintenance equipment, and more particularly to a pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant. The pneumatic wrench includes: a guide rod connected to the lower end of a first sleeve; a second sleeve mounted on the outer surface of the guide rod's side end, with a third sleeve connected to its lower end; a fixing plate connected to the outer surface of the second sleeve's side end, with a small gear and a transition gear mounted on the upper part of the fixing plate, a pneumatic motor connected to the upper end of the small gear, a large gear ring on one side of the transition gear, a sleeve connected to the lower end of the large gear ring, a bearing installed at the connection between the sleeve and the second sleeve, an inner liner inside the sleeve, a limit block connected to the side end of the inner liner, a groove formed at the connection between the limit block and the large gear ring, a main nut inside the limit block, a main bolt inside the main nut, and a connecting seat connected to the upper end of the main bolt; a connecting plate connected to the outer surface of the first sleeve's side end, with pins installed on the connecting seat and the connecting plate. This invention can disassemble and assemble various types of nuts, and has a wide range of applications.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant maintenance equipment, and more particularly to a pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant. Background Technology

[0002] During the disassembly and assembly of the pressure vessel in a pressurized water reactor nuclear power plant, a pneumatic wrench is needed to unscrew the main nut from the main bolt or to install the main nut onto the main bolt.

[0003] The pneumatic wrench in the existing patented pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant (application number: 201510254577.X) allows one person to operate multiple pneumatic wrenches simultaneously, reducing labor costs and improving work efficiency. It also features a compact structure, light weight, and simple operation, requiring minimal skill from operators and possessing strong practicality. However, the main nut adapter of this pneumatic wrench has a fixed model, while the pressure vessel in a pressurized water reactor nuclear power plant contains other shapes of external nuts, a typical example being a hexagonal prism-shaped main nut. Therefore, this pneumatic wrench can only assemble and disassemble one type of main nut, limiting its application scope.

[0004] Therefore, a pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant is needed to improve the above-mentioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant, which can disassemble and assemble various nuts and has a wide range of applications.

[0006] This invention provides a pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant, comprising:

[0007] The first ring has a guide rod connected to its lower end. A second ring is installed on the outer surface of the guide rod's side end. A third ring is connected to the lower end of the guide rod. A fixing plate is connected to the outer surface of the second ring's side end. A pinion and a transition gear are respectively installed on the upper end of the fixing plate. A pneumatic motor is connected to the upper end of the pinion. A large gear ring is provided on one side of the transition gear's outer surface. A sleeve is connected to the lower end of the large gear ring. A bearing is installed at the connection between the sleeve and the second ring. An inner liner is provided inside the sleeve. A limit block is connected to the outer surface of the inner liner's side end. A groove is provided at the connection between the limit block and the large gear ring. A main nut is provided inside the limit block. A main bolt is provided inside the main nut. A connecting seat is connected to the upper end of the main bolt.

[0008] A connecting plate is connected to the outer surface of the side end of the first ring, and a pin is installed on the connecting seat and the connecting plate.

[0009] Preferably, the connection between the second ring and the guide rod is a sliding connection, and the transition gear meshes with the pinion and the large gear ring respectively.

[0010] Preferably, the sleeve is rotatably connected to the second collar via a bearing, and the connection between the sleeve and the inner liner is a movable sleeve connection.

[0011] Preferably, the limiting block is movably engaged with the large gear ring via a slot, and the connection between the fixing screw and the large gear ring is a threaded connection.

[0012] Preferably, the connection between the inner liner and the main nut is a movable sleeve, and the connection between the main nut and the main bolt is a threaded connection.

[0013] Preferably, a through hole is provided at the connection between the pin and the connecting seat and the connecting plate, and the pin passes through the through hole through the connecting seat and the connecting plate respectively.

[0014] Preferably, the number of connecting plates is four, and they are arranged in a circular array.

[0015] Preferably, the number of guide rods is four to eight sets.

[0016] Preferably, the interior of the liner has various shapes, and the main nut can be replaced according to different models or shapes.

[0017] Preferably, a fixing screw is installed at the upper end of the limiting block to achieve a fixed connection with the large gear ring.

[0018] Compared with the prior art, the pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant of the present invention, by setting a sleeve, bearing, liner, limit block, slot and fixing screw in the pneumatic wrench for rotating the main nut, allows the liner that matches the shape of the main nut to be installed into the sleeve when disassembling and assembling the main nut, so that the limit block on the outer surface of the side end of the liner is engaged in the slot, and the large gear ring and the limit block are fixed by the fixing screw. The liner and the sleeve can be disassembled and assembled, which is beneficial to replace the liner according to different models or shapes of main nuts, thereby expanding the application range of the pneumatic wrench. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall invention;

[0020] Figure 2 This is a schematic diagram showing the disassembly of the main nut, main bolt, and second collar of the present invention;

[0021] Figure 3 This is a schematic diagram showing the disassembly of the second ring structure of the present invention;

[0022] In the diagram: 1. First collar; 2. Guide rod; 3. Second collar; 4. Third collar; 5. Fixing plate; 6. Pinion; 7. Transition gear; 8. Pneumatic motor; 9. Large gear ring; 10. Sleeve; 11. Bearing; 12. Liner; 13. Limiting block; 14. Slot; 15. Fixing screw; 16. Main nut; 17. Main bolt; 18. Connecting seat; 19. Connecting plate; 20. Pin; 21. Through hole. Detailed Implementation

[0023] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0024] Please see Figure 1-3 An embodiment of the present invention provides a pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant, comprising:

[0025] The first collar 1 has a guide rod 2 connected to its lower end. A second collar 3 is mounted on the outer surface of the side end of the guide rod 2. A third collar 4 is connected to the lower end of the guide rod 2. A fixing plate 5 is connected to the outer surface of the side end of the second collar 3. A small gear 6 and a transition gear 7 are respectively mounted on the upper end of the fixing plate 5. A pneumatic motor 8 is connected to the upper end of the small gear 6. A large gear ring 9 is provided on one side of the outer surface of the transition gear 7. A sleeve 10 is connected to the lower end of the large gear ring 9. A bearing 11 is installed at the connection between the sleeve 10 and the second collar 3. The sleeve 10 has an inner liner 12 inside. A limiting block 13 is connected to the outer surface of the side end of the inner liner 12. A groove 14 is provided at the connection between the limiting block 13 and the large gear ring 9. A fixing screw 15 is installed at the upper end of the limiting block 13. A main nut 16 is provided inside the limiting block 13. A main bolt 17 is provided inside the main nut 16. A connecting seat 18 is connected to the upper end of the main bolt 17. The second sleeve 3 is slidably connected to the guide rod 2. The transition gear 7 meshes with the small gear 6 and the large gear ring 9 respectively. The number of guide rods 2 is four to eight; the sleeve 10 is rotatably connected to the second collar 3 via the bearing 11, and the connection between the sleeve 10 and the inner liner 12 is a movable sleeve connection. The bearing 11 can reduce the friction between the sleeve 10 and the second collar 3; the limiting block 13 is movably engaged with the large gear ring 9 via the slot 14, and the connection between the fixing screw 15 and the large gear ring 9 is a threaded connection. The slot 14 facilitates the limiting block 13 to be engaged into the large gear ring 9; the connection between the inner liner 12 and the main nut 16 is a movable sleeve connection, and the main screw... The connection between the nut 16 and the main bolt 17 is a threaded connection. The main nut 16 is hexagonal in shape. The inner liner 12, which is compatible with the shape of the main nut 16, is installed inside the sleeve 10. The limiting block 13 on the outer surface of the side end of the inner liner 12 is inserted into the slot 14. The large gear ring 9 and the limiting block 13 are fixed by the fixing screw 15. The inner liner 12 and the sleeve 10 can be disassembled and assembled, which is convenient for replacing the inner liner 12 according to different models or shapes of main nuts 16, thereby expanding the application range of the pneumatic wrench.

[0026] In this embodiment, reference Figure 1 A connecting plate 19 is connected to the outer surface of the side end of the first ring 1. A pin 20 is installed on the connecting seat 18 and the connecting plate 19. A through hole 21 is provided at the connection between the pin 20 and the connecting seat 18 and the connecting plate 19. The pin 20 passes through the connecting seat 18 and the connecting plate 19 through the through hole 21. There are four sets of connecting plates 19, which are arranged in a circular array. The through hole 21 facilitates the pin 20 to pass through the connecting seat 18 and the connecting plate 19. After the inner liner 12 is put on the outside of the main nut 16, the pin 20 is inserted into the through hole 21 on the connecting seat 18 and the connecting plate 19. This can limit the first ring 1, the second ring 3 and the third ring 4 and prevent the first ring 1, the second ring 3 and the third ring 4 from rotating.

[0027] The workflow of this invention is as follows: When using the pneumatic wrench designed in this solution to disassemble and assemble the main nut of the pressure vessel in a pressurized water reactor nuclear power plant, with the connection between the liner 12 and the main nut 16 being a movable sleeve, the liner 12, which matches the shape of the main nut 16, is installed inside the sleeve 10. With the limiting block 13 movably engaged with the large gear ring 9 through the slot 14, the limiting block 13 on the outer surface of the side end of the liner 12 is engaged into the slot 14. With the connection between the fixing screw 15 and the large gear ring 9 being a threaded connection, the large gear ring 9 and the limiting block 13 are fixed by the fixing screw 15. The liner 12 and the sleeve 10 can be disassembled and assembled, which is beneficial for disassembling and assembling the liner 12 according to different models or shapes of main nuts 16. The pneumatic wrench can be replaced to expand its application range. With the connection between the inner liner 12 and the main nut 16 being a movable sleeve, after the inner liner 12 is placed on the outside of the main nut 16, and with the pin 20 passing through the through hole 21 through the connecting seat 18 and the connecting plate 19 respectively, the pin 20 is inserted into the through hole 21 on the connecting seat 18 and the connecting plate 19. This can limit the first collar 1, the second collar 3 and the third collar 4, preventing them from rotating. After supplying air to the pneumatic motor 8, the pneumatic motor 8 drives the large gear ring 9 and the inner liner 12 to rotate through the small gear 6 and the transition gear 7. The main nut 16 will drive the fixed plate 5 to rise or fall, thereby realizing the disassembly and assembly of the main nut 16.

[0028] The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant, characterized in that... ,include: The first ring (1) is connected to a guide rod (2) at its lower end. A second ring (3) is installed on the outer surface of the side end of the guide rod (2). A third ring (4) is connected to the lower end of the guide rod (2). A fixing plate (5) is connected to the outer surface of the side end of the second ring (3). A small gear (6) and a transition gear (7) are respectively installed on the upper end of the fixing plate (5). A pneumatic motor (8) is connected to the upper end of the small gear (6). A large gear ring (9) is provided on one side of the outer surface of the transition gear (7). A sleeve (10) is connected to the lower end of the sleeve (10). A bearing (11) is installed at the connection between the sleeve (10) and the second ring (3). An inner liner (12) is provided inside the sleeve (10). A limit block (13) is connected to the outer surface of the side end of the inner liner (12). A slot (14) is provided at the connection between the limit block (13) and the large gear ring (9). A main nut (16) is provided inside the limit block (13). A main bolt (17) is provided on the inner side of the main nut (16). A connecting seat (18) is connected to the upper end of the main bolt (17). A connecting plate (19) is connected to the outer surface of the side end of the first collar (1), and a pin (20) is installed on the connecting seat (18) and the connecting plate (19). The sleeve (10) is rotatably connected to the second collar (3) via a bearing (11), and the connection between the sleeve (10) and the inner liner (12) is a movable sleeve connection; The interior of the liner (12) has various shapes and can be replaced according to different models or shapes of main nuts (16).

2. The pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant according to claim 1, characterized in that, The second ring (3) is connected to the guide rod (2) by a sliding connection, and the transition gear (7) is meshed with the small gear (6) and the large gear ring (9) respectively.

3. The pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant according to claim 1, characterized in that, The upper end of the limiting block (13) is equipped with a fixing screw (15) to achieve a fixed connection with the large gear ring (9).

4. The pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant according to claim 3, characterized in that, The limiting block (13) is movably engaged with the large gear ring (9) through the slot (14), and the connection between the fixing screw (15) and the large gear ring (9) is a threaded connection.

5. The pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant according to claim 1, characterized in that, The connection between the inner liner (12) and the main nut (16) is a movable sleeve, and the connection between the main nut (16) and the main bolt (17) is a threaded connection.

6. The pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant according to claim 1, characterized in that, The pin (20) is provided with a through hole (21) at the connection between the pin (20) and the connecting seat (18) and the connecting plate (19), and the pin (20) passes through the connecting seat (18) and the connecting plate (19) through the through hole (21).

7. The pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant according to claim 1, characterized in that, The number of connecting plates (19) is four, and they are arranged in a circular array.

8. The pneumatic wrench for rotating the main nut in a pressurized water reactor nuclear power plant according to claim 1, characterized in that, The number of guide rods (2) is four to eight sets.

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