Auxiliary tool for main pump shaft maintenance of nuclear power plant

Abstract

The utility model discloses a nuclear power plant main pump shaft overhauls auxiliary tool, including base, is installed with left support subassembly, right support subassembly on the base, and left support subassembly and right support subassembly structure are same, wherein left support subassembly includes mounting panel, is equipped with lower pivot and two side pivots on the mounting panel, and the lower pivot and side pivot are respectively covered with silica gel cover. The utility model discloses through left support subassembly and right support subassembly to the main pump shaft form the support, and the main pump shaft can rotate and adjust the angle, and conveniently overhaul the main pump shaft, through the design of slide rail, sliding block and two -way screw rod, can fast and flexible adjustment left, right support subassembly spacing, and adapt to different specifications main pump shaft, and the cooperation of telescopic board and spring can adjust side pivot position according to the main pump shaft size, and enhance the support stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of maintenance auxiliary tools, specifically relating to maintenance auxiliary tools for main pump shafts in nuclear power plants. Background Technology

[0002] During the operation of a nuclear power plant, the main pump, as a core component of the reactor coolant circulation system, operates under harsh environments of high temperature, high pressure, and strong radiation for extended periods. The main pump bearings are subjected to complex mechanical and thermal stresses, making them highly susceptible to wear, corrosion, and other malfunctions. Therefore, regular inspection and maintenance of the main pump shaft is a crucial step in ensuring the safe and stable operation of a nuclear power plant. Currently, during the maintenance of main pumps in nuclear power plants, traditional support and fixing tools are typically used for operations such as disassembly, installation, and relocation of the main pump shaft. These tools have several drawbacks: First, traditional support structures are difficult to flexibly adapt to main pump shafts of different sizes, resulting in poor support stability. During operation, they are prone to shaking or even tilting, which not only affects maintenance efficiency but may also cause scratches, collisions, and other damage to the main pump shaft surface, severely impacting its service life and performance. Second, the adjustment methods of existing tools are complex and cumbersome, requiring maintenance personnel to spend a significant amount of time and effort on tool adjustment and positioning, failing to meet the needs of efficient maintenance of main pump shafts in nuclear power plants. Third, when supporting the main pump shaft, traditional tools are in direct contact with the shaft surface, lacking effective buffering and protection measures. This cannot prevent damage to the protective layer on the main pump shaft surface, thereby increasing the risk of main pump shaft failure. Utility Model Content

[0003] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an auxiliary tool for overhauling the main pump shaft of a nuclear power plant, including a base, on which a left support assembly and a right support assembly are installed. The left support assembly and the right support assembly have the same structure. The left support assembly includes a mounting plate, on which a lower rotating shaft and two side rotating shafts are provided. The axial direction of the lower rotating shaft and the axial direction of the side rotating shafts are parallel. The mounting plate is rotatably connected to both the lower rotating shaft and the side rotating shafts. The height of the side rotating shafts is higher than that of the lower rotating shaft. The two side rotating shafts are located on both sides of the lower rotating shaft. Silicone sleeves are fitted on the lower rotating shaft and the side rotating shafts respectively.

[0004] As a preferred embodiment of the above technical solution, the two ends of the side rotating shaft are respectively connected to telescopic plates via bearings, and the mounting plate is provided with telescopic tubes for the telescopic plates to be inserted, with springs inside the telescopic tubes.

[0005] As a preferred embodiment of the above technical solution, the base is provided with a slide rail, the length direction of the slide rail is parallel to the axial direction of the lower rotating shaft, and a slider is installed on the mounting plate, the slider being slidably mounted on the slide rail.

[0006] As a preferred embodiment of the above technical solution, the slide rail is composed of two parallel T-shaped rails, each T-shaped rail is equipped with several sliders, and the sliders have T-shaped grooves that cooperate with the T-shaped rails.

[0007] As a preferred embodiment of the above technical solution, the outer side of the mounting plate is provided with an inner limiting plate, and the two ends of the slide rail are respectively fixedly connected with an outer limiting plate.

[0008] As a preferred embodiment of the above technical solution, a bidirectional lead screw is provided between the two T-shaped rails. The two ends of the bidirectional lead screw are rotatably connected to an outer limiting plate. The bidirectional lead screw includes a forward threaded section and a reverse threaded section. A forward lead screw pair is threadedly connected to the forward threaded section and is fixedly connected to the mounting plate of the left support assembly. A reverse lead screw pair is threadedly connected to the reverse threaded section and is fixedly connected to the mounting plate of the right support assembly. Handwheels are fixedly connected to both ends of the bidirectional lead screw.

[0009] The beneficial effects of this utility model are as follows: This utility model provides support for the main pump shaft through left and right support components, allowing the main pump shaft to rotate and adjust its angle, facilitating maintenance. The design of slide rails, sliders, and bidirectional lead screws allows for quick and flexible adjustment of the distance between the left and right support components, adapting to main pump shafts of different specifications. The cooperation between the telescopic plate and springs allows for adjustment of the side rotating shaft position according to the main pump shaft dimensions, enhancing support stability. The silicone sleeves fitted on the lower and side rotating shafts effectively prevent direct contact with the main pump shaft, preventing scratches and collision damage, and protecting the protective layer on the shaft surface. The overall design significantly improves the efficiency of main pump shaft maintenance, reduces maintenance costs, and provides a reliable guarantee for the stable operation of the main pump shaft in nuclear power plants. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the telescopic pipe. Detailed Implementation

[0011] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0012] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0014] Auxiliary tools for overhauling the main pump shaft of a nuclear power plant, such as Figure 1 and 2 As shown, the system includes a base 1, on which a left support assembly and a right support assembly are mounted. The left and right support assemblies have identical structures. The left support assembly includes a mounting plate 2, on which a lower rotating shaft 3 and two side rotating shafts 4 are mounted. The axial directions of the lower rotating shaft 3 and the side rotating shafts 4 are parallel. Both the lower rotating shaft 3 and the side rotating shafts 4 are rotatably connected to the mounting plate 2. The height of the side rotating shafts 4 is higher than that of the lower rotating shaft 3. The two side rotating shafts 4 are located on either side of the lower rotating shaft 3. Silicone sleeves 5 are fitted onto both the lower rotating shaft 3 and the side rotating shafts 4. The disassembled pump main shaft is placed on the base 1, and the left and right support assemblies support both ends of the pump main shaft. The lower rotating shaft 3 supports the bottom, and the two side rotating shafts 4 stabilize the pump main shaft from the sides. The pump main shaft can be rotated during maintenance. The silicone sleeves 5 protect the pump main shaft. The silicone sleeves 5 are replaced periodically, and the replaced silicone sleeves 5 are disposed of separately to prevent leakage of any adhering radioactive materials. Both the lower rotating shaft 3 and the side rotating shaft 4 are detachable, making disassembly convenient.

[0015] Furthermore, each end of the side rotating shaft 4 is connected to a telescopic plate 6 via bearings. The mounting plate 2 is provided with a telescopic tube 7 for inserting the telescopic plate 6, and a spring 8 is installed inside the telescopic tube 7. After the telescopic plate 6 is inserted into the telescopic tube 7, an anti-detachment plate is provided to prevent the telescopic plate 6 from disengaging from the telescopic tube 7. When the side rotating shaft 4 is subjected to force, it overcomes the spring force and compresses the spring. The spring allows the distance between the side rotating shafts 4 to be automatically adjusted according to the diameter of the main pump shaft.

[0016] Furthermore, the base 1 is provided with a slide rail, the length direction of which is parallel to the axial direction of the lower rotating shaft 3. A slider 9 is mounted on the mounting plate 2, and the slider 9 is slidably mounted on the slide rail. By moving the slider 9, the distance between the left support assembly and the right support assembly can be adjusted.

[0017] Furthermore, the slide rail is composed of two parallel T-shaped rails 10, and each T-shaped rail 10 is equipped with several sliders 9. The sliders 9 have T-shaped grooves that mate with the T-shaped rails 10. The mating of the T-shaped rails 10 and the T-shaped grooves prevents the sliders 9 from detaching from the slide rail.

[0018] Furthermore, the mounting plate 2 is provided with inner limiting plates 11 on its outer side, and outer limiting plates 12 are fixedly connected to both ends of the slide rail. The inner limiting plates 11 restrict the main pump shaft in the axial direction.

[0019] Furthermore, a bidirectional lead screw 13 is provided between the two T-shaped rails 10. The two ends of the bidirectional lead screw 13 are rotatably connected to outer limiting plates 12. The bidirectional lead screw 13 includes a forward threaded section 14 and a reverse threaded section 15. A forward lead screw pair is threadedly connected to the forward threaded section 14, and the forward lead screw pair is fixedly connected to the mounting plate 2 of the left support assembly. A reverse lead screw pair is threadedly connected to the reverse threaded section 15, and the reverse lead screw pair is fixedly connected to the mounting plate 2 of the right support assembly. Handwheels 16 are fixedly connected to both ends of the bidirectional lead screw 13. By rotating the bidirectional lead screw 13 through the handwheels 16, the distance between the left and right support assemblies is controlled, accommodating main pump shafts of different lengths.

[0020] It is worth mentioning that the technical features such as the bidirectional lead screw involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this utility model patent. This utility model patent will not elaborate further.

[0021] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experimentation on the basis of the prior art should be within the scope of protection defined by the claims.

Claims

1. An auxiliary tool for overhauling the main pump shaft of a nuclear power plant, characterized in that, It includes a base, on which a left support assembly and a right support assembly are mounted. The left and right support assemblies have the same structure. The left support assembly includes a mounting plate with a lower rotating shaft and two side rotating shafts. The axial direction of the lower rotating shaft is parallel to the axial direction of the side rotating shafts. Both the lower and side rotating shafts are rotatably connected to the mounting plate. The height of the side rotating shafts is higher than that of the lower rotating shaft. The two side rotating shafts are located on both sides of the lower rotating shaft. Silicone sleeves are fitted on the lower rotating shaft and the side rotating shafts respectively.

2. The auxiliary tool for overhauling the main pump shaft of a nuclear power plant as described in claim 1, characterized in that, The two ends of the side rotating shaft are respectively connected to telescopic plates via bearings. The mounting plate is provided with telescopic tubes for inserting the telescopic plates, and springs are installed inside the telescopic tubes.

3. The auxiliary tool for overhauling the main pump shaft of a nuclear power plant as described in claim 1, characterized in that, The base is equipped with a slide rail, the length of which is parallel to the axial direction of the lower rotating shaft. A slider is mounted on the mounting plate and is slidably fitted onto the slide rail.

4. The auxiliary tool for overhauling the main pump shaft of a nuclear power plant as described in claim 3, characterized in that, The slide rail consists of two parallel T-shaped rails, each T-shaped rail is equipped with several sliders, and the sliders have T-shaped grooves that cooperate with the T-shaped rails.

5. The auxiliary tool for overhauling the main pump shaft of a nuclear power plant as described in claim 4, characterized in that, The mounting plate is provided with an inner limiting plate on its outer side, and the two ends of the slide rail are respectively fixedly connected with an outer limiting plate.

6. The auxiliary tool for overhauling the main pump shaft of a nuclear power plant as described in claim 5, characterized in that, A bidirectional lead screw is provided between the two T-shaped rails. The two ends of the bidirectional lead screw are rotatably connected to the outer limiting plate. The bidirectional lead screw includes a forward threaded section and a reverse threaded section. A forward lead screw pair is threadedly connected to the forward threaded section and is fixedly connected to the mounting plate of the left support assembly. A reverse lead screw pair is threadedly connected to the reverse threaded section and is fixedly connected to the mounting plate of the right support assembly. Handwheels are fixedly connected to both ends of the bidirectional lead screw.

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