A device for measuring the gap between the moving components of a nuclear power plant drive mechanism

Abstract

The utility model discloses a kind of for nuclear power plant driving mechanism moving assembly gap measuring device, belong to measurement technical field. Including the base of central aperture, the rotating platform installed on base. The device of the utility model is scanned to measuring point by its structure design, cooperation scanner to rotating platform and lifting platform, then accurate measurement is carried out on computer, improve the measurement accuracy, reduce the participation of operating personnel, reduce the radiation hazard, also greatly improve the measurement efficiency.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, and in particular to a device for measuring the gap between moving components of a nuclear power plant drive mechanism. Background Technology

[0002] In nuclear power plant reactor overhaul projects, the reactor control rod assembly drive mechanism is one of the core pieces of equipment in a nuclear power plant. It is mainly used to lift and lower the control rod assemblies inside the fuel assemblies to enable the nuclear reactor to start up, regulate power, and stop the nuclear reaction. The moving assembly moves frequently, and during the unit overhaul, the gap of the moving assembly is measured to ensure the safety and reliability of the equipment.

[0003] When measuring the mobile component on-site, the cantilever crane first lifts the mobile component to the top of the measuring hole. Then, the operator aligns the caliper with the lowest measuring point and begins to measure. The cantilever crane is gradually lowered, and manual measurements are taken at the second, third, fourth, and fifth measuring points. After the measurements are completed, the cantilever crane lifts the mobile component into place and moves it to the installation location.

[0004] However, when operators use vernier calipers for measurement, the measured values ​​are inaccurate, which can easily cause operational risks to time-sensitive components. Currently, personnel contact measurement is used, which increases the radiation dose received by operators when the exposure radiation dose reaches 1 mSv / h, which does not comply with ALARA policy. In addition, manual measurement is less efficient and occupies a longer critical path time during overhaul. Utility Model Content

[0005] The purpose of this invention is to solve the problems mentioned in the background art by designing a device for measuring the gap between moving components of a nuclear power plant drive mechanism.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a gap measuring device for moving components of a nuclear power plant drive mechanism, comprising a base with a central opening and a rotating platform mounted on the base. The base has an annular groove, and a gear ring is fixedly installed inside the annular groove. A drive gear is meshed with the gear ring, and the drive gear is connected to a drive rod. The drive rod passes through the rotating platform and is connected to a lifting frame. The lifting frame is fixedly installed on the rotating platform, and a reduction motor is fixedly installed at the top of the lifting frame. The drive rod is threadedly connected to the lifting platform, and a scanner is fixedly installed on the lifting platform.

[0007] Preferably, the lifting frame has a limiting groove inside, and one end of the lifting platform has a corresponding limiting block.

[0008] Preferably, the limiting groove and the limiting block are T-shaped to prevent the lifting platform from rotating on its own.

[0009] Preferably, the portion of the drive rod above the top surface of the rotating platform is threaded, while the portion below the top surface of the rotating platform is unthreaded.

[0010] Preferably, the lifting platform and the rotating platform have the same stroke, so that when the lifting platform rises from the bottom to the top, the rotating platform has just completed one revolution.

[0011] Beneficial effects: This utility model provides a device for measuring the gap of moving components in the drive mechanism of a nuclear power plant. It has the following advantages: through its structural design, the device uses a rotating platform and a lifting platform in conjunction with a scanner to scan the measurement points, and then performs accurate measurements on a computer. This improves the measurement accuracy, reduces the involvement of operators, reduces radiation hazards, and also greatly improves the measurement efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front view structural schematic diagram of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a structural schematic diagram of the AA cross-section of this utility model; Figure 5 This is a partially enlarged structural schematic diagram of the present invention, B.

[0013] In the diagram, 1. Base; 2. Rotating platform; 3. Lifting frame; 4. Gear motor; 5. Lifting platform; 6. Scanner; 7. Drive rod; 8. Annular groove; 9. Gear ring; 10. Drive gear; 11. Limiting block; 12. Limiting groove; 13. Measuring hole; 14. Moving component. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-5This utility model provides a technical solution: a device for measuring the gap of moving components in a nuclear power plant drive mechanism, comprising a base 1 with a central opening and a rotating platform 2 mounted on the base 1. The base 1 has an annular groove 8, and a gear ring 9 is fixedly mounted inside the annular groove 8. A drive gear 10 is meshed with the gear ring 9, and a drive rod 7 is fixedly connected to the drive gear 10. The drive rod 7 passes through the rotating platform 2 and is connected to a lifting frame 3. The lifting frame 3 is fixedly mounted on the rotating platform 2, and a reduction motor 4 is fixedly mounted at the top of the lifting frame 3. The drive rod 7 is threadedly connected to a lifting platform 5, and a scanner 6 is fixedly mounted on the lifting platform 5. A limiting groove 12 is provided inside the lifting frame 3, and a corresponding limiting block 11 is provided at one end of the lifting platform 5. The limiting groove 12 and the limiting block 11 are T-shaped to prevent the lifting platform 5 from rotating. The drive rod 7 has threads on the portion above the top surface of the rotating platform 2, and no threads on the portion below the top surface of the rotating platform 2. The lifting platform 5 and the drive rod 7 are connected by threads for easy lifting and lowering. The rotating platform 2 and the drive rod 7 are rotatably connected, facilitating the drive rod 7 to drive the drive gear 10 to rotate. The lifting platform 5 and the rotating platform 2 have the same stroke. When the lifting platform 5 rises from the bottom to the top, the rotating platform 2 has rotated exactly one revolution, thus making the scanning more comprehensive and reducing omissions.

[0016] Those skilled in the art should connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence should refer to the working principle described below, where the electrical connections between the various electrical components are completed in sequence. The detailed connection methods are well-known technologies in the field. The following mainly introduces the working principle and process, and will not describe the electrical control further.

[0017] In this implementation plan: First, the cantilever crane lifts the moving component 14 above the measuring hole 13 on the base 1. Then, the measuring point is lowered into the scanning range of the scanner 6. After the scanner 6 starts scanning, the reduction motor 4 is turned on. The reduction motor 4 drives the drive rod 7 to rotate, which in turn drives the lifting platform 5 to rise. At the same time, it drives the drive gear 10 to rotate. The drive gear 10 rotates on its own axis. Since the drive gear 10 meshes with the gear ring 9, it will revolve around the gear ring 9, thereby driving the rotating platform 2 to rotate. When the lifting platform 5 rises to the top, the rotating platform 2 has completed one revolution and returned to its original position. At this time, reversing the reduction motor 4 allows for repeated scanning of the measuring point to avoid omissions. Then, the cantilever crane is controlled to fall, and the scanning of each measuring point is completed in sequence. After scanning is completed, accurate measurements can be performed on the computer.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the gap between moving components of a drive mechanism in a nuclear power plant, characterized in that, The system includes a base (1) with a central opening and a rotating platform (2) mounted on the base (1). The base (1) has an annular groove (8). A gear ring (9) is fixedly installed inside the annular groove (8). A drive gear (10) is meshed with the gear ring (9). A drive rod (7) is connected to the drive gear (10). The drive rod (7) passes through the rotating platform (2) and is connected to a lifting frame (3). The lifting frame (3) is fixedly installed on the rotating platform (2). A geared motor (4) is fixedly installed at the top of the lifting frame (3). The drive rod (7) is threadedly connected to the lifting platform (5). A scanner (6) is fixedly installed on the lifting platform (5).

2. The device for measuring the gap of moving components in a nuclear power plant drive mechanism according to claim 1, characterized in that, The lifting frame (3) is provided with a limiting groove (12) inside, and the lifting platform (5) is provided with a corresponding limiting block (11) at one end.

3. The device for measuring the gap of moving components in a nuclear power plant drive mechanism according to claim 2, characterized in that, The limiting groove (12) and the limiting block (11) are T-shaped, which can prevent the lifting platform (5) from rotating.

4. The device for measuring the gap of moving components in a nuclear power plant drive mechanism according to claim 1, characterized in that, The drive rod (7) has threads on the part above the top surface of the rotating platform (2) and no threads on the part below the top surface of the rotating platform (2).

5. The device for measuring the gap of moving components in a nuclear power plant drive mechanism according to claim 1, characterized in that, The lifting platform (5) and the rotating platform (2) have the same stroke. When the lifting platform (5) rises from the bottom to the top, the rotating platform (2) rotates exactly one revolution.

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