Centering device and centering method for control rod drive wire test

Abstract

The invention discloses a centering device and a centering method for a control rod drive wire test, which can achieve higher form and position precision by using a centering tool for machining, solves the problem of low centering precision, adopts a building block type structural design, reduces the weight of a single piece, improves the stability in a positioning process, and improves the production efficiency. Repeated disassembly and assembly do not need re-centering and re-positioning; according to the technical scheme, the device comprises an upper barrel, a lower barrel, 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 barrel; centering mechanisms are arranged in the upper hanging basket, the lower hanging basket and the upper barrel; the upper cylinder body and the lower cylinder body are connected through a reactor core upper plate supporting frame; the upper hanging basket is connected with the lower hanging basket through a flange; the first centering tool, the second centering tool, the third centering tool, the fourth centering tool, the fifth centering tool, the sixth centering tool and the seventh centering tool are sequentially arranged from bottom to top, and the centering tools are matched with the grooves of the adjacent centering tools in an inserted mode.

Description

Technical Field

[0001] The 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 the nuclear power plant test, in order to ensure that the control rod assembly can move smoothly in the drive line when the control rod drive mechanism performs the lifting, lowering and rod dropping functions, and to avoid excessive deformation and mechanical friction inside the drive line that may cause damage to the component equipment, the installation of the control rod drive line must meet higher alignment requirements.

[0004] At present, CN114999677A discloses a control rod drive line test piece centering device and centering method, which aligns different test pieces in turn through an optical centering axial alignment method. This method can achieve a high centering accuracy during measurement, but when it is necessary to match the positioning pins to achieve the connection, the vibration produced during the process will cause the centering accuracy of the drive line assembly to decrease, resulting in low centering accuracy; the positioning stability of the drive line assembly is poor, resulting in the control rod being unable to move up and down smoothly, so repeated centering operations are required; especially for small installation spaces, and when optical instruments cannot be installed, this method cannot be used, so the centering device also has problems such as limited application scenarios. Summary of the invention

[0005] In view of the above 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. A building block structure design is adopted to reduce the weight of a single piece, 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 the 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 arranged in the upper hanging basket, the lower hanging basket and the upper cylinder; a driving mechanism installation assembly is arranged above the upper cylinder, a driving mechanism is installed on the driving mechanism installation assembly, and is used to drive the control rod to move, a core upper plate support frame is arranged between the upper cylinder and the lower cylinder, and a control rod moving hole is arranged on the core upper plate support frame, and the moving hole is arranged in plurality; a fuel assembly support frame is arranged at the lower end of the lower hanging basket, and a fuel assembly is arranged on the fuel assembly support frame;

[0008] The centering mechanism comprises 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 arranged at the center position 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.

[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 arranged 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 pair of centering tools, the third pair of centering tools, the fifth pair of centering tools and the seventh pair of centering tools.

[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, install the third centering tool into the upper hanging basket, and the third centering tool contacts the inner wall of the upper hanging basket;

[0019] S2, centering and installing the fuel assembly support frame, installing the second centering tool below the third centering tool, installing the first centering tool below the second centering tool, and installing the fuel assembly support frame below the first 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;

[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 which time the fuel assembly support frame and the core upper plate support frame are in a coaxial state;

[0021] S4, aligning and installing the drive mechanism installation assembly, installing the sixth centering tool on the fifth centering tool, installing the seventh centering tool on the sixth centering tool, and installing the seventh centering tool at the center of the drive mechanism installation assembly, at which time the fuel assembly support frame, the core upper plate support frame and the drive mechanism installation assembly are in a coaxial state;

[0022] S5. Install the drive mechanism on the drive mechanism installation 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 line 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 through the core upper plate support frame, and only needs to implement centering positioning once through the centering mechanism, and repeated disassembly and assembly do not need to be re-centering and positioning; the coaxiality of the centering tool is ensured by precision machining the centering tool, which solves the problem of low centering accuracy caused by low rigidity of the traditional centering device, and ensures that the control rod can smoothly reciprocate in the through hole on the core upper plate support frame; centering can be achieved by simply cooperating the centering tool with the adjacent centering tool, without the need for 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 shape and position accuracy and small 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 during the positioning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, 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 It 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 descriptions are illustrative and 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 meanings as those 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 explicitly stated 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 "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0030] In the control rod drive line test, it is necessary to accommodate a bundle of drive line assemblies in the cylinder, and the drive line assembly includes a control rod drive mechanism, a guide cylinder, a fuel assembly and a control rod assembly; the structure of the cylinder is a cylindrical container, which provides a mounting interface that meets the centering requirements for the test piece; in order to meet the centering requirements of the test piece, the centering mechanism of the test piece 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 arranged above the upper cylinder 5, and a drive mechanism is mounted on the drive mechanism mounting assembly 2. A core upper plate support frame 10 is arranged between the upper cylinder 5 and the lower cylinder 13, and a through hole for controlling the movement of the control rod is arranged on the core upper plate support frame 10, and the through hole is arranged in plurality; a fuel assembly support frame 20 is arranged at the lower end of the lower hanging basket 18, and a fuel assembly is arranged on the fuel assembly support frame 20; The body 13 is arranged up and down, the upper cylinder 5 and the lower cylinder 13 are detachably connected, the upper cylinder 5 and the lower cylinder 13 are both tubular structures, and the diameter of the lower cylinder 13 is smaller than the diameter 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 up and down; the upper hanging basket 12, the lower hanging basket 18 and the upper cylinder 5 are provided with a centering mechanism, and the centering mechanism is composed of a plurality of centering fixtures. The centering mechanism is used to ensure 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 rod can be.

[0033] An upper flange 4 is provided at the upper end of the upper cylinder 5, and a lower flange 8 is provided at the lower end of the upper cylinder 5; a drive mechanism mounting assembly 2 is installed on the upper part of the upper flange 4, and positioning holes are provided on the upper flange 4 and the drive mechanism mounting assembly 2, and a first positioning pin 1 is installed in the 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, and the core upper plate support frame 10 and the lower flange 8 are detachably connected, preferably bolts are used for fastening, and 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, the third centering tool 23 is arranged above the second centering tool 22, and 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 position 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 position 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 arranged between the fuel assembly support frame 20 and the first centering tool 21. The first centering tool 21 is installed 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, 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 to the groove formed above the first centering tool 21 , and then install the lower end groove of the third centering tool 23 on the second centering tool 22 after the measurement is qualified.

[0039] The third centering tool 23 contacts the inner wall of the upper hanging basket 12, ensuring that the center axis is aligned during the installation of the upper hanging basket 12 and the lower hanging basket 18 of the third centering tool 23. A fourth positioning pin 14 is provided between the upper hanging basket flange 16 and the lower hanging basket flange 17, and the upper hanging basket flange 16 and the lower hanging basket flange 17 are connected and fixed by a third bolt 15. The fourth centering tool 24 is installed on the third centering tool 23, and the fifth centering tool 25 is installed on the fourth centering tool 24, so that the center axis of the core upper plate support frame 10 is aligned.

[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 centered.

[0041] The alignment method includes the following steps:

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

[0043] S2, centering and installing the fuel assembly support frame 20, installing the second centering tool 22 below the third centering tool 23, installing the first centering tool 21 below the second centering tool 22, and installing the fuel assembly support frame 20 below the first tool 21. At this time, the fuel assembly support frame 20 is coaxial with the first centering tool 21, and the fuel assembly support frame 20 is welded and fixed to the lower hanging basket 18. The fuel assembly support frame 20 is determined by two third positioning pins 19, and the first centering tool 21 is installed on the fuel assembly support frame 20, aligning the two third positioning pins 19, and 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, align 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, and install the outer side of the fifth centering tool 25 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 in a coaxial state, and the second positioning pin 6 is installed on the lower flange 8 of the upper cylinder 5 and the core upper plate support frame 10, and the fifth positioning pin 7 is installed on the core upper plate support frame 10 and the lower cylinder upper flange 11;

[0045] S4, align and install the drive mechanism installation assembly 2, install the sixth centering tool 26 on the fifth centering tool 25, install the seventh centering tool 27 on the sixth centering tool 26, and install the seventh centering tool 27 at the center of the drive mechanism installation assembly 2. At this time, the fuel assembly support frame 20, the core upper plate support frame 10 and the drive mechanism installation assembly 2 are in a coaxial state; install the first positioning pin 1 on the upper flange 4 of the upper cylinder 5 and the drive mechanism installation assembly 2;

[0046] S5. Install the drive mechanism on the drive mechanism installation 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 line is aligned.

[0047] Although the above describes the specific implementation mode 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 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 centering mechanism is arranged in the upper hanging basket, the lower hanging basket and the upper cylinder; a driving mechanism mounting assembly is arranged above the upper cylinder, a driving mechanism is installed on the driving mechanism mounting assembly, and is used to drive the control rod to move; a core upper plate support frame is arranged between the upper cylinder and the lower cylinder, and a moving hole for the control rod is arranged on the core upper plate support frame, and the moving hole is arranged in plurality; a fuel assembly support frame is arranged at the lower end of the lower hanging basket, and a fuel assembly is arranged on the fuel assembly support frame; The centering mechanism comprises 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 as a centering reference for 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 circular tubular structures, and the diameter of the lower cylinder is smaller than that of the upper cylinder.

3. A control rod drive line test centering device according to claim 1, characterized in that: An upper flange is arranged at the upper end of the upper cylinder; positioning holes are arranged 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 is detachably connected to the lower flange, 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 arranged at the upper end of the lower cylinder; a second positioning pin is arranged 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. A control rod drive line test centering device according to claim 1, characterized in that: An upper hanging basket flange is arranged at the lower end of the upper hanging basket, a lower hanging basket flange is arranged 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.

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

8. A control rod drive line test centering device according to claim 1, characterized in that: The upper hanging basket flange and the lower hanging basket flange are provided with a fourth locating pin.

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

10. A control rod drive line test centering device centering 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, install the third centering tool into the upper hanging basket, and the third centering tool contacts the inner wall of the upper hanging basket; S2, centering and installing the fuel assembly support frame, installing the second centering tool below the third centering tool, installing the first centering tool below the second centering tool, and installing the fuel assembly support frame below the first 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 which time the fuel assembly support frame and the core upper plate support frame are in a coaxial state; S4, aligning and installing the drive mechanism installation assembly, installing the sixth centering tool on the fifth centering tool, installing the seventh centering tool on the sixth centering tool, and installing the seventh centering tool at the center of the drive mechanism installation assembly, at which time the fuel assembly support frame, the core upper plate support frame and the drive mechanism installation assembly are in a coaxial state; S5. Install the drive mechanism on the drive mechanism installation 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 line is aligned.

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