Mounting and adjusting tool for large cavity parts

Abstract

The utility model relates to a mounting and adjusting tool for large cavity parts, which is mainly used for mounting and adjusting coaming-forming plate components in reactor internals of a nuclear reactor. The tool comprises radial adjusting devices and an inner cavity supporting device, and the radial adjusting devices are installed on a lower reactor core plate, annularly and symmetrically arranged around the axis and used for adjusting the radial position of a surrounding plate; the inner cavity supporting device is supported between the first surrounding plate and the second surrounding plate, and the stability of the size of an inner cavity between the surrounding plates is ensured. The radial adjusting device adopts the combined design of a threaded supporting rod and a rotating rod, so that multi-angle fine adjustment is realized; the supporting length of the inner cavity supporting device is flexibly adjusted through cooperation of a sleeve rod and a telescopic rod. Through the flexible gasket and the clamping structure, the tool is prevented from being in direct contact with a part, and the precise surface is prevented from being scratched or damaged by pressing. The tool is stable in structure and flexible to operate, the assembly precision, efficiency and safety are remarkably improved, and the requirement for high reliability of nuclear equipment is met.

Description

Technical Field

[0001] This utility model relates to the field of nuclear equipment installation technology, and in particular to an installation and adjustment tool for large cavity-type parts. Background Technology

[0002] The core shroud-formed plate assembly is a key component of nuclear reactor internals, undertaking important functions such as coolant guidance, heat removal, structural support and positioning, neutron shielding, and thermal stress relief. Its complex structure typically consists of a core shroud and multiple panels with specific geometric shapes, with an overall height exceeding 4 meters and requiring extremely high assembly precision. In existing technologies, the installation and adjustment of the core shroud-formed plate assembly mainly rely on general-purpose tools (such as jacks, shims, and temporary support frames) and manual operation, which suffers from limitations in space, insufficient precision, low efficiency, and safety hazards.

[0003] Furthermore, the adjustment devices mentioned in existing patented technologies are mostly designed for small parts, and their structural rigidity, size adjustment range, and multi-degree-of-freedom adjustment capabilities are insufficient to meet the special requirements of large cavity-type parts. For example, traditional radial adjustment devices cannot achieve a symmetrical ring arrangement within a limited space and lack precise control over circumferential displacement; internal cavity support devices often fail due to insufficient extension range or poor locking stability. Therefore, there is an urgent need to develop an installation and adjustment tool specifically for large cavity-type parts to solve the above-mentioned technical pain points, improve assembly efficiency, accuracy, and safety, and meet the high reliability requirements of nuclear equipment. Summary of the Invention

[0004] In view of the above problems, the technical problem to be solved by this utility model is to provide an installation and adjustment tool for large cavity-type parts. By adopting a specific structure, it can solve the above-mentioned technical pain points, improve assembly efficiency, accuracy and safety, and meet the high reliability requirements of nuclear equipment.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An installation and adjustment tool for a large cavity-type part includes a radial adjustment device and an inner cavity support device. The in-core component enclosure is assembled from a first enclosure and a second enclosure. The first enclosure and the second enclosure are vertically installed on the upper end face of the lower core plate. The inner cavity support device is supported between the first enclosure and the second enclosure. The radial adjustment device is installed on the lower core plate. The radial adjustment device is close to the second enclosure and arranged symmetrically in a ring around the axis of the lower core plate.

[0007] In a preferred embodiment, the radial adjustment device includes a base, a pin vertically disposed on the lower end face of the base, and a column vertically disposed on the upper end face of the base. The pin is engaged in the drainage hole of the lower core plate, and the end of the column is vertically connected to a threaded support rod.

[0008] In a preferred embodiment, a threaded sleeve is provided at the end of the column, the threaded support rod is threadedly connected to the threaded sleeve and coaxially arranged, one end of the threaded support rod is provided with a rotating rod, the other end of the threaded support rod is perpendicularly connected to the pressure plate, and a flexible gasket is installed on the other side of the pressure plate.

[0009] In a preferred embodiment, the end face of the pressure plate is provided with symmetrical locking holes in a ring, and the end face of the flexible gasket is provided with corresponding locking pins. The pressure plate and the flexible gasket are interlocked by the locking holes and locking pins.

[0010] In a preferred embodiment, the internal cavity support device includes a sleeve rod and a telescopic rod. The telescopic rod is inserted into the sleeve rod and is coaxially arranged with the sleeve rod. Limiting holes are provided through the sleeve rod and the telescopic rod. The limiting holes are equidistantly arranged. After the limiting screw passes through the limiting hole, it locks and fixes the position of the sleeve rod and the telescopic rod.

[0011] In a preferred embodiment, the ends of the sleeve rod and the telescopic rod are movably connected to the snap-fit ​​connector, which snaps onto the inner wall of the second enclosure.

[0012] In a preferred embodiment, the snap-fit ​​connector includes a threaded connector that is threadedly connected to the ends of the sleeve rod and the telescopic rod. The other end of the threaded connector is provided with a rotating shaft seat. One end of the rotating column is snapped into the rotating shaft seat and rotates freely along its own axis. The other end of the rotating column is perpendicularly connected to the snap-fit ​​protrusion.

[0013] An installation and adjustment tool for large cavity-type parts has the following beneficial effects in practical use:

[0014] 1. Through the coordinated action of the radial adjustment device and the inner cavity support device, the precise adjustment of the enclosure plate-forming plate assembly in the circumferential and radial directions can be achieved, ensuring the accuracy requirements of the inner cavity dimensions between enclosure plates, the gap dimensions between enclosure plates, and the gap dimensions between the enclosure plate and the fuel assembly positioning pin, meeting the millimeter-level assembly tolerance.

[0015] 2. The radial adjustment device adopts a combination design of threaded support rod and rotating rod, which can be finely adjusted at multiple angles to adapt to the complex working conditions of the narrow space inside the suspended basket cylinder; the internal cavity support device realizes flexible adjustment of the support length through the cooperation of sleeve rod and telescopic rod, ensuring support stability.

[0016] 3. The adjustment tool uses flexible pads and snap-fit ​​structure to avoid direct contact between the tool and the part, effectively preventing scratches or damage to precision surfaces and extending the service life of the component;

[0017] 4. The tool has a stable structure and a secure locking device, which avoids the problems of part deformation or support failure caused by uneven force during traditional adjustment, thus ensuring the safety and reliability of the assembly process. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the components of the nuclear reactor internal component enclosure plate-forming plate assembly of this utility model;

[0020] Figure 2 This is a diagram showing the installation positions of the radial adjustment device of this utility model.

[0021] Figure 3 This is a schematic diagram of the internal installation of the radial adjustment device and the inner cavity support device of this utility model;

[0022] Figure 4 This is an enlarged schematic diagram of the radial adjustment device structure of this utility model;

[0023] Figure 5 This is an exploded view of the radial adjustment device structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the internal cavity support device of this utility model;

[0025] Figure 7 This is an enlarged schematic diagram of the card connector structure of this utility model.

[0026] In the diagram: First enclosure 1, Second enclosure 2, Radial adjustment device 3, Base 301, Pin 302, Column 303, Threaded support rod 304, Rotating rod 305, Threaded sleeve 306, Pressure plate 307, Locking hole 3071, Flexible gasket 308, Locking pin 3081, Lower core plate 4, Drain hole 401, Inner cavity support device 5, Sleeve rod 501, Telescopic rod 502, Limiting hole 503, Limiting screw 504, Locking connector 505, Threaded connector 5051, Rotating shaft seat 5052, Rotating column 5053, Locking protrusion 5054. Detailed Implementation

[0027] like Figures 1 to 3 As shown, an installation and adjustment tool for a large cavity-type part includes a radial adjustment device 3 and an inner cavity support device 5. The core component enclosure is assembled from a first enclosure 1 and a second enclosure 2. The first enclosure 1 and the second enclosure 2 are vertically installed on the upper end face of the lower core plate 4. The inner cavity support device 5 is supported between the first enclosure 1 and the second enclosure 2. The radial adjustment device 3 is installed on the lower core plate 4. The radial adjustment device 3 is close to the second enclosure 2 and is arranged in a ring symmetrical arrangement around the axis of the lower core plate 4.

[0028] The first enclosure 1 and the second enclosure 2 are composed of circular, right-angled, zigzag-shaped panels, typically reaching a height of 4011.7 mm. Since the enclosure assembly is installed after the basket body, it is necessary to ensure the internal cavity dimensions between the enclosures, the gap dimensions between the enclosures, and the gap dimensions between the enclosures and the fuel assembly positioning pins. Therefore, the internal cavity support device 5 is needed to support the enclosure assembly to prevent deformation during installation. Then, the radial adjustment device 3 is used to adjust the circumferential direction of the enclosure assembly in a limited space to ensure the installation accuracy of the in-core component enclosures.

[0029] Preferred solutions include Figure 4 As shown, the radial adjustment device 3 includes a base 301, a pin 302 is vertically arranged on the lower end face of the base 301, and a column 303 is vertically arranged on the upper end face of the base 301. The pin 302 is engaged in the water flow hole 401 of the lower core plate 4, and the end of the column 303 is vertically connected to the threaded support rod 304.

[0030] Preferred solutions include Figure 4 and Figure 5 As shown, a threaded sleeve 306 is provided at the end of the column 303. The threaded support rod 304 is threadedly connected to the threaded sleeve 306 and coaxially arranged. A rotating rod 305 is provided at one end of the threaded support rod 304, and the other end of the threaded support rod 304 is perpendicularly connected to the pressure plate 307. A flexible gasket 308 is installed on the other side of the pressure plate 307. A locking hole 3071 is symmetrically opened in an annular shape at the end face of the pressure plate 307, and a locking pin 3081 is correspondingly provided at the end face of the flexible gasket 308. The pressure plate 307 and the flexible gasket 308 are locked together by the locking hole 3071 and the locking pin 3081.

[0031] When it is necessary to adjust the position of the enclosure assembly in the circumferential direction, simply use a wrench or other tools to rotate the rotating rod 305, which in turn drives the threaded support rod 304 to rotate synchronously, causing the threaded support rod 304 to move back and forth in the axial direction. Since the radial adjustment device 3 is located near the second enclosure 2 and is arranged symmetrically in a ring along the circumferential direction, the threaded support rod 304 can push the second enclosure 2 and the first enclosure 1 to move in the circumferential direction, thus enabling the circumferential adjustment function of the enclosure assembly. The pressure plate 307 and flexible gasket 308 provided at the end of the threaded support rod 304 can effectively prevent the device from damaging the inner wall of the enclosure.

[0032] Preferred solutions include Figure 6As shown, the inner cavity support device 5 includes a sleeve rod 501 and a telescopic rod 502. The telescopic rod 502 is inserted into the sleeve rod 501 and is coaxially arranged with the sleeve rod 501. Limiting holes 503 are formed through the sleeve rod 501 and the telescopic rod 502. The limiting holes 503 are equidistantly arranged. After the limiting screw 504 passes through the limiting hole 503, it locks and fixes the position of the sleeve rod 501 and the telescopic rod 502. With the above structure, the overall length of the inner cavity support device 5 can be flexibly adjusted according to the inner diameter of the inner cavity to meet different installation requirements.

[0033] Preferred solutions include Figure 6 As shown, the ends of the sleeve rod 501 and the telescopic rod 502 are movably connected to the snap-fit ​​connector 505, which snaps onto the inner wall of the second enclosure 2.

[0034] Preferred solutions include Figure 7 As shown, the snap-fit ​​connector 505 includes a threaded connector 5051, which is threadedly connected to the ends of the sleeve rod 501 and the telescopic rod 502. The other end of the threaded connector 5051 is provided with a rotating shaft seat 5052. One end of the rotating column 5053 is snapped into the rotating shaft seat 5052 and rotates freely along its own axis. The other end of the rotating column 5053 is perpendicularly connected to the snap-fit ​​protrusion 5054.

[0035] During installation, the length of the device is initially adjusted by using the sleeve rod 501 and the telescopic rod 502. Then, the snap-fit ​​connector 505 can be finely adjusted by rotating the threaded connector 5051, so that the snap-fit ​​protrusion 5054 can be fully snapped into the inner wall of the second enclosure plate 2 to ensure the support effect of the inner cavity support device 5.

Claims

1. A tool for installing and adjusting large cavity parts, comprising radial adjustment means (3) and inner cavity support means (5), characterised in that: The inner-assembly surrounding plate is assembled by a first surrounding plate (1) and a second surrounding plate (2), which are vertically installed at the upper end surface of a lower core plate (4); an inner cavity supporting device (5) is supported between the first surrounding plate (1) and the second surrounding plate (2), and a radial adjustment device (3) is arranged on the lower core plate (4), which is close to the second surrounding plate (2) and is arranged in annular symmetry around the axis of the lower core plate (4).

2. The mounting adjustment tool for large cavity type parts according to claim 1, characterized in that: The radial adjustment device (3) comprises a base (301), the lower end surface of the base (301) is vertically provided with a column pin (302), and the upper end surface of the base (301) is vertically provided with a stand column (303), the column pin (302) is clamped in the water flow hole (401) of the lower core plate (4), and the end of the stand column (303) is vertically connected with a threaded supporting rod (304).

3. The mounting adjustment tool for large cavity type parts according to claim 2, characterized in that: The end of the stand column (303) is provided with a threaded sleeve (306), the threaded supporting rod (304) is threadedly connected with the threaded sleeve (306) and coaxially arranged, one end of the threaded supporting rod (304) is provided with a rotating rod (305), the other end of the threaded supporting rod (304) is vertically connected with a pressing plate (307), and the other side of the pressing plate (307) is provided with a flexible gasket (308).

4. The mounting adjustment tool for large cavity type parts according to claim 3, characterized in that: The end surface of the pressing plate (307) is annularly and symmetrically provided with a clamping hole (3071), and the end surface of the flexible gasket (308) is correspondingly provided with a clamping pin (3081), the pressing plate (307) and the flexible gasket (308) are clamped with each other through the clamping hole (3071) and the clamping pin (3081).

5. The mounting adjustment tool for large cavity type parts of claim 1, wherein: The inner cavity supporting device (5) comprises a sleeve rod (501) and a telescopic rod (502), the telescopic rod (502) is inserted into the sleeve rod (501) and coaxially arranged with the sleeve rod (501), limit holes (503) are penetratingly formed on the sleeve rod (501) and the telescopic rod (502), the limit holes (503) are equidistantly arranged, and a limit screw rod (504) locks and fixes the positions of the sleeve rod (501) and the telescopic rod (502) after penetrating through the limit holes (503).

6. The mounting adjustment tool for large cavity type parts according to claim 5, characterized in that: The ends of the sleeve rod (501) and the telescopic rod (502) are movably connected with a clamping joint (505), and the clamping joint (505) is clamped on the inner wall of the second surrounding plate (2).

7. The mounting adjustment tool for large cavity type parts of claim 5, wherein: The clamping joint (505) comprises a threaded connecting head (5051), the threaded connecting head (5051) is threadedly connected with the ends of the sleeve rod (501) and the telescopic rod (502), the other end of the threaded connecting head (5051) is provided with a rotating shaft seat (5052), one end of a rotating column (5053) is clamped in the rotating shaft seat (5052) and freely rotates along the axis thereof, and the other end of the rotating column (5053) is vertically connected with a clamping block (5054).

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