Flexible shaft used for nuclear power plant finger casing core signal transmission and preparation method thereof

A signal transmission and finger sleeve technology, applied in the direction of flexible shafts, centrifugal force-resistant rotating parts, shafts, etc., can solve the problems of pipe wall damage, difficulty in adapting, and inability to install copper cores, etc., to meet long-distance push-pull and ensure stability Good running and flexible shaft stiffness

Active Publication Date: 2021-09-21
CHINA NUCLEAR POWER TECH RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing flexible shafts have at least the following disadvantages: 1. The shaft diameter is thick and the flexibility is poor, so it is difficult to adapt to a large curvature, which will cause damage to the pipe wall in a narrow space; 2. It is difficult to realize the long-distance push-pull function; 3. It is impossible to realize the flexible shaft The positioning of the end in the narrow space; 4. The copper core for signal transmission cannot be installed, and the core signal collected by the detector cannot be transmitted to the outside

Method used

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  • Flexible shaft used for nuclear power plant finger casing core signal transmission and preparation method thereof

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preparation example Construction

[0040] The present invention also provides a preparation method for preparing the above flexible shaft, comprising the following steps:

[0041] S0: pressing the third metal wire with a preset diameter into a metal strip with a preset width and thickness at a preset pressure.

[0042] Wherein, the third metal wire can be a steel wire with a steel quality of 45-65 steel and a preset diameter of φ0.5-1.6mm, and the preset pressure can be 80±10kN. The width and thickness can be set to be 0.8-2 mm and 0.3-0.6 mm, respectively.

[0043] Understandably, in other embodiments, the cross section of the third metal wire may also be in other shapes such as square. In some other embodiments, the metal strip with preset width and thickness can also be provided directly, so that step S0 can also be omitted.

[0044] S1: performing a first heat treatment on a metal strip with a preset width and thickness, so that the hardness of the metal strip is increased from a first preset hardness to ...

Embodiment

[0065] With a preset pressure of 80kN, the third metal wire made of manganese steel-65Mn and with a preset diameter of φ0.8mm is pressed into a steel strip with a width of 1.2mm, a thickness of 0.4mm, and a hardness of 19 degrees;

[0066] The steel strip is preheated to about 100°C by an electric furnace, and the quenching is quickly completed within 0.5s. After the quenching is completed, the hardness of the steel strip is increased to about 45 degrees;

[0067] A single single layer of quenched steel strips is spirally wound side by side with a first pitch of 0.4mm to form a supporting protective layer 2 with a preset outer diameter and inner diameter of 2.5mm and 1.7mm respectively;

[0068] Use 1.5mm peripheral felt steel wire to polish the inner wall surface of the supporting protective layer 2;

[0069] 20 first metal wires made of manganese steel-65Mn with a diameter of about φ0.4mm are tightly wound on the outer surface of the supporting protective layer 2 with a pres...

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Abstract

The present invention relates to a flexible shaft used for signal transmission of nuclear power plant bushing core and a preparation method thereof. The preparation method includes: S1: performing a first heat treatment on a metal strip with a preset width and thickness, so that the hardness of the metal strip is changed from The first preset hardness is raised to the second preset hardness; S2: the metal strip is helically wound side by side with the first pitch to form a supporting protective layer with a preset outer diameter and inner diameter; S3: a plurality of first metal wires are wound along the preset The lead helixes are closely wound side by side on the outer surface of the support protection layer to form a push-pull transmission layer; S4: the second metal wire is tightly wound on the outer surface of the push-pull transmission layer with a second pitch to form a counting positioning layer; S5: the support The protective layer, the push-pull transmission layer and the counting positioning layer are subjected to the second heat treatment; S6: the signal transmission layer is penetrated in the support protection layer, so that the signal transmission layer can be pushed and pulled smoothly in the support protection layer. The flexible shaft has high flexibility and good rigidity, which can accurately locate the position of the detector and transmit the core signal over a long distance.

Description

technical field [0001] The invention relates to the field of nuclear power plant reactor finger bushing core detection tools, and more specifically relates to a flexible shaft used for nuclear power plant finger bushing core signal transmission and a preparation method thereof. Background technique [0002] A flexible shaft is commonly used in nuclear power plant reactor finger casing core detection tools. The existing flexible shafts have at least the following disadvantages: 1. The shaft diameter is thick and the flexibility is poor, so it is difficult to adapt to a large curvature, which will cause damage to the pipe wall in a narrow space; 2. It is difficult to realize the long-distance push-pull function; 3. It is impossible to realize the flexible shaft The positioning of the end in the narrow space; 4. The copper core for signal transmission cannot be installed, and the core signal collected by the detector cannot be transmitted to the outside. Contents of the inven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C1/00B23P15/00
CPCB23P15/00F16C1/00F16C2220/40
Inventor 朱健林刘刚吴玉刘治郭思远余冰
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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