A control rod drive line test centering device and centering method

Abstract

The present invention discloses a control rod drive line test centering device and a centering method. The centering tooling processed by machining can achieve higher shape and position accuracy, solve the problem of low centering accuracy, adopt a building block structure design, reduce the weight of a single piece, improve the stability during the positioning process, and do not need to be re-centering and positioning during repeated disassembly and assembly; the technical solution includes: an upper cylinder, a lower cylinder, an upper hanging basket, a lower hanging basket and a centering mechanism; the upper hanging basket and the lower hanging basket are arranged in the lower cylinder; the upper hanging basket, the lower hanging basket and the upper cylinder are provided with a centering mechanism; the upper cylinder and the lower cylinder are connected by a core upper plate support frame; the upper hanging basket and the lower hanging basket are connected by a flange; the first centering tooling, the second centering tooling, the third centering tooling, the fourth centering tooling, the fifth centering tooling, the sixth centering tooling and the seventh centering tooling are arranged in sequence from bottom to top, and the centering tooling is plugged into and matched with the grooves of the adjacent centering tooling.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power plant testing, and in particular relates to a control rod drive line test centering device and a centering method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] During nuclear power plant testing, the installation of the control rod drive line must meet high alignment requirements to ensure smooth movement of the control rod assembly in the drive line when the control rod drive mechanism performs lifting, lowering, and rod dropping operations. This is also to prevent damage to the component equipment caused by excessive deformation and mechanical friction within the drive line.

[0004] CN114999677A currently discloses a control rod drive line test piece centering device and method, which sequentially aligns different test pieces using an optical centering axial alignment method. This method can achieve high centering accuracy during measurement, but when a locating pin is required for connection, the vibration generated during the process can cause the drive line assembly to lose centering accuracy, resulting in low centering accuracy. The drive line assembly also has poor positioning stability, preventing the control rod from moving up and down smoothly, necessitating repeated centering operations. This method is particularly unusable in confined installation spaces and when optical instruments cannot be installed. Therefore, the centering device also faces problems such as limited application scenarios. Summary of the Invention

[0005] In response to the above-mentioned problems, the present invention provides a control rod drive line test centering device and centering method, which solves the problem of low centering accuracy of the drive line assembly. The drive line positioning flange is aligned through a centering tool. The building block structure design is adopted to reduce the weight of each unit, improve the stability of the drive line assembly during positioning, and ensure that the control rod can smoothly pass through the support frame when moving up and down without the need for re-centering.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a control rod drive line test centering device, comprising an upper cylinder, a lower cylinder, an upper hanging basket, a lower hanging basket, a fuel assembly support frame, a core upper plate support frame and a centering mechanism; the upper hanging basket and the lower hanging basket are arranged in the lower cylinder; the centering mechanism is provided in the upper hanging basket, the lower hanging basket and the upper cylinder; a driving mechanism mounting assembly is provided above the upper cylinder, a driving mechanism is mounted on the driving mechanism mounting assembly, and is used to drive the control rods to move; a core upper plate support frame is provided between the upper cylinder and the lower cylinder, and a control rod moving hole is provided on the core upper plate support frame, and a plurality of control rod moving holes are provided; a fuel assembly support frame is provided at the lower end of the lower hanging basket, and a fuel assembly is provided on the fuel assembly support frame;

[0008] The centering mechanism includes a first centering tool, a second centering tool, a third centering tool, a fourth centering tool, a fifth centering tool, a sixth centering tool and a seventh centering tool, and the seven centering tools of the centering mechanism are all coaxial; the first centering tool is arranged at the center position of the fuel assembly support frame as a centering reference for the drive line; the fifth centering tool is set at the center position of the core upper plate support frame and is above the fourth centering tool; the seventh centering tool is set at the center position of the drive mechanism mounting assembly; the second centering tool is set above the first centering tool, the third centering tool is set above the second centering tool, and the fourth centering tool is set above the third centering tool; the sixth centering tool is set between the fifth centering tool and the seventh centering tool.

[0009] Furthermore, the upper cylinder and the lower cylinder are arranged up and down, and are detachably connected to each other. Both the upper cylinder and the lower cylinder are tubular structures, and the diameter of the lower cylinder is smaller than that of the upper cylinder.

[0010] Furthermore, an upper flange is provided at the upper end of the upper cylinder; positioning holes are provided on the upper flange and the drive mechanism mounting assembly, and a first positioning pin is installed in the positioning hole.

[0011] Furthermore, a lower flange is provided at the lower end of the upper cylinder; the core upper plate support frame and the lower flange are detachably connected, and a fifth positioning pin is provided between the core upper plate support frame and the lower flange.

[0012] Furthermore, a lower cylinder upper flange is provided at the upper end of the lower cylinder; a second positioning pin is provided between the core upper plate support frame and the lower cylinder upper flange, and the second positioning pin and the fifth positioning pin are symmetrical with respect to the axis of the core upper plate support frame.

[0013] Furthermore, an upper hanging basket flange is provided at the lower end of the upper hanging basket, a lower hanging basket flange is provided at the upper end of the lower hanging basket, and the lower end of the lower hanging basket and the fuel assembly support frame are fixedly connected by welding.

[0014] Furthermore, at least two third positioning pins are provided between the fuel assembly support frame and the first centering tool.

[0015] Furthermore, the upper hanging basket flange and the lower hanging basket flange are provided with a fourth positioning pin.

[0016] Furthermore, grooves are provided at the center positions of the first centering tooling, the third centering tooling, the fifth centering tooling and the seventh centering tooling.

[0017] In a second aspect, the present invention further provides a method for centering a control rod drive line test centering device, comprising the following steps:

[0018] S1. Determine the reference of the centering mechanism and install the third centering tool into the upper hanging basket so that the third centering tool contacts the inner wall of the upper hanging basket;

[0019] S2. Center and install the fuel assembly support frame. Install the second centering tool below the third centering tool, install the first centering tool below the second centering tool, and install the fuel assembly support frame below the first tool. At this time, the fuel assembly support frame and the first centering tool are coaxial, and the fuel assembly support frame is welded and fixed to the lower hanging basket.

[0020] S3. Centering and installing the core upper plate support frame, installing a fourth centering tool on the third centering tool, installing a fifth centering tool on the fourth centering tool, and installing the outer side of the fifth centering tool at the center of the core upper plate support frame. At this time, the fuel assembly support frame and the core upper plate support frame are coaxial;

[0021] S4. Align and install the drive mechanism mounting assembly. Install the sixth centering fixture on the fifth centering fixture, and the seventh centering fixture on the sixth centering fixture. The seventh centering fixture is installed at the center of the drive mechanism mounting assembly. At this time, the fuel assembly support frame, the core upper plate support frame, and the drive mechanism mounting assembly are coaxial.

[0022] S5. Install the drive mechanism on the drive mechanism mounting assembly, the control rod assembly on the core upper plate support frame, and the fuel assembly on the fuel assembly support frame. At this time, the control rod drive wire is aligned.

[0023] Compared with the prior art, the present invention has the following advantages and positive effects:

[0024] The present invention fixes the upper cylinder and the lower cylinder together by the core upper plate support frame, and only needs to implement the centering positioning once by the centering mechanism, and there is no need to re-center and position them after repeated disassembly and assembly; the coaxiality of the centering fixture is ensured by precision machining, which solves the problem of low centering accuracy caused by the low rigidity of the traditional centering device, and ensures that the control rod can move back and forth smoothly in the through hole on the core upper plate support frame; centering can be achieved by simply cooperating the centering fixture with the adjacent centering fixture without other auxiliary equipment, which not only ensures the centering accuracy of the flange The centering mechanism includes seven centering fixtures, each of which has high form and position accuracy and is small in size, similar to a building block structure, which reduces the weight of a single piece and facilitates installation and operation. Due to its small size, it is more suitable for use in situations where the installation space is small and optical centering calibration cannot be used. Since each centering fixture is made of metal, during the centering process of the fixture, the fixture can be used to ensure that the connection is under sufficient rigidity to match the centering locating pin to avoid misalignment, thereby improving the stability of the positioning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 This is a cross-sectional view of the drive line test centering device of the present invention;

[0027] In the figure: 1. first locating pin, 2. drive mechanism mounting assembly, 3. first bolt, 4. upper flange, 5. upper cylinder, 6. second locating pin, 7. fifth locating pin, 8. lower flange, 9. second bolt, 10. core upper plate support frame, 11. lower cylinder upper flange, 12. upper hanging basket, 13. lower cylinder, 14. fourth locating pin, 15. third bolt, 16. upper hanging basket flange, 17. lower hanging basket flange, 18. lower hanging basket, 19. third locating pin, 20. fuel assembly support frame, 21. first centering tool, 22. second centering tool, 23. third centering tool, 24. fourth centering tool, 25. fifth centering tool, 26. sixth centering tool, 27. seventh centering tool DETAILED DESCRIPTION

[0028] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0030] In the control rod drive wire test, a bundle of drive wire assemblies needs to be accommodated in the cylinder. The drive wire assembly includes the control rod drive mechanism, guide cylinder, fuel assembly and control rod assembly. The cylinder structure is a cylindrical container, which provides a mounting interface for the test piece that meets the centering requirements. In order to meet the centering requirements of the test piece, the test piece centering mechanism is processed according to the accuracy of "mechanical centering".

[0031] This embodiment discloses a control rod drive line test centering device, such as Figure 1 As shown, it includes an upper cylinder 5, a lower cylinder 13, an upper hanging basket 12, a lower hanging basket 18, a fuel assembly support frame 20, a core upper plate support frame 10 and a centering mechanism; the upper hanging basket 12 and the lower hanging basket 18 are arranged in the lower cylinder 13; the upper hanging basket 12, the lower hanging basket 18 and the upper cylinder 5 are provided with a centering mechanism;

[0032] A drive mechanism mounting assembly 2 is provided above the upper cylinder 5, and a drive mechanism is installed on the drive mechanism mounting assembly 2. A core upper plate support frame 10 is provided between the upper cylinder 5 and the lower cylinder 13, and a through hole for moving the control rod is provided on the core upper plate support frame 10, and the through hole is provided in plurality; a fuel assembly support frame 20 is provided at the lower end of the lower hanging basket 18, and a fuel assembly is provided on the fuel assembly support frame 20; the upper cylinder 5 and the lower cylinder 13 are provided with a plurality of through holes for moving the control rod; the fuel assembly support frame 20 is provided with a plurality of through holes ... The upper cylinder 5 and the lower cylinder 13 are detachably connected. Both the upper cylinder 5 and the lower cylinder 13 are tubular structures, and the diameter of the lower cylinder 13 is smaller than that of the upper cylinder 5. The upper hanging basket 12 and the lower hanging basket 18 are arranged in the lower cylinder 13, and the upper hanging basket 12 and the lower hanging basket 18 are also arranged in an upper and lower manner. A centering mechanism is provided in the upper hanging basket 12, the lower hanging basket 18 and the upper cylinder 5, and the centering mechanism is composed of a plurality of centering fixtures. The centering mechanism ensures the straightness of the central axis of the drive mechanism mounting assembly 2, the core upper plate support frame 10, the upper hanging basket 12, the lower hanging basket 18 and the fuel assembly support frame 20, so that the control rods can be positioned in the center of the drive mechanism mounting assembly 2, the core upper plate support frame 10, the upper hanging basket 12, the lower hanging basket 18 and the fuel assembly support frame 20.

[0033] The upper end of the upper cylinder 5 is provided with an upper flange 4, and the lower end of the upper cylinder 5 is provided with a lower flange 8. A drive mechanism mounting assembly 2 is mounted on the upper portion of the upper flange 4. Positioning holes are provided on the upper flange 4 and the drive mechanism mounting assembly 2. A first positioning pin 1 is installed in each positioning hole to ensure the centering accuracy of the upper cylinder 5 and the drive mechanism mounting assembly 2. A core upper plate support frame 10 is provided below the lower flange 8. The core upper plate support frame 10 is detachably connected to the lower flange 8, preferably fastened with bolts. A second positioning pin 6 is provided between the core upper plate support frame 10 and the lower flange 8.

[0034] A lower cylinder upper flange 11 is provided at the upper end of the lower cylinder 13, and the core upper plate support frame 10 is provided above the lower cylinder upper flange 11. The core upper plate support frame 10 is provided between the lower flange 8 of the upper cylinder 5 and the lower cylinder upper flange 11. A third locating pin 19 is provided between the core upper plate support frame 10 and the lower cylinder upper flange 11, and the second locating pin 6 and the fifth locating pin 7 are symmetrical with respect to the axis of the core upper plate support frame 10.

[0035] An upper basket flange 16 is provided at the lower end of the upper basket 12, and a lower basket flange 17 is provided at the upper end of the lower basket 18; fourth locating pins 14 are provided on the upper basket flange 16 and the lower basket flange 17, and the upper basket flange 16 and the lower basket flange 17 are connected and fixed by third bolts 15; a fuel assembly support frame 20 is provided at the lower end of the lower basket 18.

[0036] The centering mechanism includes a first centering tool 21, a second centering tool 22, a third centering tool 23, a fourth centering tool 24, a fifth centering tool 25, a sixth centering tool 26 and a seventh centering tool 27; the first centering tool 21 is arranged above the fuel assembly support frame 20, the second centering tool 22 is arranged above the first centering tool 21, and the third centering tool 23 is arranged above the second centering tool 22. The third centering tool 23 is connected to the upper hanging basket 1 2, the fourth centering tool 24 is arranged above the third centering tool 23, and the third centering tool 23 can support the fourth centering tool 24; the fifth centering tool 25 is arranged at the center of the core upper plate support frame 10 and is above the fourth centering tool 24, the seventh centering tool 27 is arranged at the center of the drive mechanism mounting assembly 2, and the sixth centering tool 26 is arranged between the fifth centering tool 25 and the seventh centering tool 27.

[0037] At least two of the third positioning pins 19 are provided between the fuel assembly support frame 20 and the first centering tool 21. The first centering tool 21 is mounted on the fuel assembly support frame 20 and the two third positioning pins 19 are aligned. The outer dimensions of the first centering tool 21 and the inner diameter of the lower hanging basket 18 have a high matching accuracy, thereby ensuring the centering accuracy between the first centering tool 21 and the fuel assembly support frame 20. The lower hanging basket 18 and the fuel assembly support frame 20 are fixedly connected by welding.

[0038] Install the second centering tool 22 into the groove formed above the first centering tool 21 . After passing the measurement, install the lower end groove of the third centering tool 23 onto the second centering tool 22 .

[0039] The third centering fixture 23 contacts the inner wall of the upper basket 12, ensuring that the upper basket 12 and the lower basket 18 are aligned during installation. A fourth locating pin 14 is provided between the upper basket flange 16 and the lower basket flange 17, and a third bolt 15 is used to connect and secure the upper basket flange 16 and the lower basket flange 17. The fourth centering fixture 24 is installed on the third centering fixture 23, and the fifth centering fixture 25 is installed on the fourth centering fixture 24, thereby aligning the center axis of the core upper plate support frame 10.

[0040] The sixth centering tool 26 is installed on the fifth centering tool 25 , and the seventh centering tool 27 is installed on the sixth centering tool 26 . The drive mechanism mounting assembly 2 and the core upper plate support frame 10 are aligned with their central axes.

[0041] The alignment method includes the following steps:

[0042] S1. Determine the reference of the centering mechanism and install the third centering tool into the upper hanging basket so that the third centering tool contacts the inner wall of the upper hanging basket;

[0043] S2. Center and install the fuel assembly support frame 20. Install the second centering tool 22 below the third centering tool 23. Install the first centering tool 21 below the second centering tool 22. Install the fuel assembly support frame 20 below the first centering tool 21. At this time, the fuel assembly support frame 20 and the first centering tool 21 are coaxial. The fuel assembly support frame 20 is welded and fixed to the lower hanging basket 18. The fuel assembly support frame 20 is fixed by two third locating pins 19. Install the first centering tool 21 onto the fuel assembly support frame 20 and align the two third locating pins 19. The outer dimensions of the first centering tool 21 and the inner diameter of the lower hanging basket 18 have a high matching accuracy.

[0044] S3. Center and install the core upper plate support frame 10. Install the fourth centering tool 24 on the third centering tool 23. Install the fifth centering tool 25 on the fourth centering tool 24. The outer side of the fifth centering tool 25 is installed at the center of the core upper plate support frame 10. At this time, the fuel assembly support frame 20 and the core upper plate support frame 10 are coaxial. Install the second locating pin 6 on the lower flange 8 of the upper cylinder 5 and the core upper plate support frame 10. Install the fifth locating pin 7 on the core upper plate support frame 10 and the lower cylinder upper flange 11.

[0045] S4. Center and install the drive mechanism mounting assembly 2. Install the sixth centering fixture 26 on the fifth centering fixture 25 and the seventh centering fixture 27 on the sixth centering fixture 26. The seventh centering fixture 27 is installed at the center of the drive mechanism mounting assembly 2. At this time, the fuel assembly support frame 20, the core upper plate support frame 10, and the drive mechanism mounting assembly 2 are coaxial. Install the first locating pin 1 on the upper flange 4 of the upper cylinder 5 and the drive mechanism mounting assembly 2.

[0046] S5. Install the drive mechanism on the drive mechanism mounting assembly, the control rod assembly on the core upper plate support frame, and the fuel assembly on the fuel assembly support frame. At this time, the control rod drive wire is aligned.

[0047] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A control rod drive line test centering device, characterized in that: It comprises an upper cylinder, a lower cylinder, an upper hanging basket, a lower hanging basket, a fuel assembly support frame, a core upper plate support frame and a centering mechanism; the upper hanging basket and the lower hanging basket are arranged in the lower cylinder; the upper hanging basket, the lower hanging basket and the upper cylinder are provided with a centering mechanism; a driving mechanism mounting assembly is provided above the upper cylinder, a driving mechanism is installed on the driving mechanism mounting assembly, for driving the control rod to move, an upper core plate support frame is provided between the upper cylinder and the lower cylinder, a moving hole for the control rod is provided on the upper core plate support frame, and a plurality of moving holes are provided; a fuel assembly support frame is provided at the lower end of the lower hanging basket, and a fuel assembly is provided on the fuel assembly support frame; The centering mechanism includes a first centering tool, a second centering tool, a third centering tool, a fourth centering tool, a fifth centering tool, a sixth centering tool and a seventh centering tool, and the seven centering tools of the centering mechanism are all coaxial; The first centering tool is arranged at the center of the fuel assembly support frame and serves as the centering reference of the drive line; the fifth centering tool is arranged at the center of the core upper plate support frame and is above the fourth centering tool; The seventh centering tool is arranged at the center position of the drive mechanism mounting assembly; the second centering tool is arranged above the first centering tool, the third centering tool is arranged above the second centering tool, and the fourth centering tool is arranged above the third centering tool; The sixth centering tool is arranged between the fifth centering tool and the seventh centering tool.

2. A control rod drive line test centering device according to claim 1, characterized in that: The upper cylinder and the lower cylinder are arranged up and down, and are detachably connected to each other. Both the upper cylinder and the lower cylinder are tubular structures, and the diameter of the lower cylinder is smaller than that of the upper cylinder.

3. The control rod drive line test centering device according to claim 1, characterized in that: An upper flange is provided at the upper end of the upper cylinder; positioning holes are provided on the upper flange and the drive mechanism mounting assembly, and a first positioning pin is installed in the positioning hole.

4. A control rod drive line test centering device according to claim 1, characterized in that: A lower flange is provided at the lower end of the upper cylinder; the core upper plate support frame and the lower flange are detachably connected, and a fifth positioning pin is provided between the core upper plate support frame and the lower flange.

5. A control rod drive line test centering device according to claim 4, characterized in that: A lower cylinder upper flange is provided at the upper end of the lower cylinder; a second positioning pin is provided between the core upper plate support frame and the lower cylinder upper flange, and the second positioning pin and the fifth positioning pin are symmetrical with respect to the axis of the core upper plate support frame.

6. The control rod drive line test centering device according to claim 1, characterized in that: The lower end of the upper hanging basket is provided with an upper hanging basket flange, the upper end of the lower hanging basket is provided with a lower hanging basket flange, and the lower end of the lower hanging basket and the fuel assembly support frame are fixedly connected by welding.

7. The control rod drive line test centering device according to claim 1, characterized in that: At least two third positioning pins are provided between the fuel assembly support frame and the first centering tool.

8. The control rod drive line test centering device according to claim 6, characterized in that: The upper hanging basket flange and the lower hanging basket flange are provided with a fourth locating pin.

9. The control rod drive line test centering device according to claim 1, characterized in that: Grooves are provided at the center positions of the first centering tooling, the third centering tooling, the fifth centering tooling and the seventh centering tooling.

10. A control rod drive line test centering device alignment method according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1. Determine the reference of the centering mechanism and install the third centering tool into the upper hanging basket so that the third centering tool contacts the inner wall of the upper hanging basket; S2. Align and install the fuel assembly support frame. Install the second centering tool below the third centering tool, install the first centering tool below the second centering tool, and install the fuel assembly support frame below the first centering tool. At this time, the fuel assembly support frame is coaxial with the first centering tool, and the fuel assembly support frame is welded and fixed to the lower hanging basket. S3. Centering and installing the core upper plate support frame, installing a fourth centering tool on the third centering tool, installing a fifth centering tool on the fourth centering tool, and installing the outer side of the fifth centering tool at the center of the core upper plate support frame. At this time, the fuel assembly support frame and the core upper plate support frame are coaxial; S4. Align and install the drive mechanism mounting assembly. Install the sixth centering fixture on the fifth centering fixture, and the seventh centering fixture on the sixth centering fixture. The seventh centering fixture is installed at the center of the drive mechanism mounting assembly. At this time, the fuel assembly support frame, the core upper plate support frame, and the drive mechanism mounting assembly are coaxial. S5. Install the drive mechanism on the drive mechanism mounting assembly, install the control rod assembly on the core upper plate support frame, and install the fuel assembly on the fuel assembly support frame. At this time, the control rod drive wire is aligned.

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