CN112555268A

CN112555268A - Flexible shaft for transmitting signals of nuclear power station fingerstall tube core stacking and preparation method thereof

Info

Publication number: CN112555268A
Application number: CN202011249859.8A
Authority: CN
Inventors: 朱健林; 刘刚; 吴玉; 刘治; 郭思远; 余冰
Original assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd; China Nuclear Power Institute Co Ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-03-26
Anticipated expiration: 2040-11-10
Also published as: CN112555268B

Abstract

The invention relates to a flexible shaft for transmitting a nuclear power station fingerstall tube core signal and a preparation method thereof, wherein the preparation method comprises the following steps: s1: carrying out first heat treatment on a metal belt with a preset width and thickness to increase the hardness of the metal belt from a first preset hardness to a second preset hardness; s2: spirally winding metal strips side by side at a first pitch to form a support protective layer with preset outer diameter and inner diameter; s3: tightly winding a plurality of first metal wires spirally along a preset lead side by side on the outer surface of the support protective layer to form a push-pull transmission layer; s4: tightly and spirally winding a second metal wire on the outer surface of the push-pull transmission layer at a second screw pitch to form a counting positioning layer; s5: carrying out second heat treatment on the supporting protective layer, the push-pull transfer layer and the counting and positioning layer; s6: the signal transmission layer is arranged in the supporting protection layer in a penetrating mode, so that the signal transmission layer can be smoothly pushed and pulled in the supporting protection layer. The flexible shaft has high flexibility and rigidity, can accurately position the detector and remotely transmit the core signal.

Description

Flexible shaft for transmitting signals of nuclear power station fingerstall tube core stacking and preparation method thereof

Technical Field

The invention relates to the field of a nuclear power station reactor fingerstall tube core detection tool, in particular to a flexible shaft for transmitting a nuclear power station fingerstall tube core signal and a preparation method thereof.

Background

A flexible shaft is commonly used in a reactor finger sleeve core detection tool of a nuclear power station. The existing flexible shaft at least has the following disadvantages: 1. the shaft diameter is thick, the flexibility is poor, the large curvature is difficult to adapt to, and the pipe wall in a narrow space is damaged; 2. the long-distance push-pull function is difficult to realize; 3. the tail end of the flexible shaft cannot be positioned in a 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.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a flexible shaft for transmitting a reactor core signal of a thimble tube of a nuclear power station and a preparation method thereof, aiming at the defects in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of a flexible shaft for transmitting a nuclear power station fingerstall core signal is constructed, and comprises the following steps:

s1: carrying out first heat treatment on a metal belt with a preset width and thickness to increase the hardness of the metal belt from a first preset hardness to a second preset hardness;

s2: spirally winding the metal strips subjected to the first heat treatment side by side at a first pitch to form a support protective layer with a preset outer diameter and inner diameter;

s3: tightly winding a plurality of first metal wires spirally along a preset lead side by side on the outer surface of the support protective layer to form a push-pull transmission layer;

s4: tightly and spirally winding a second metal wire on the outer surface of the push-pull transmission layer at a second screw pitch to form a counting positioning layer;

s5: carrying out second heat treatment on the wound and combined supporting protective layer, the push-pull transfer layer and the counting and positioning layer;

s6: and a signal transmission layer is arranged in the supporting protective layer in a penetrating way, so that the signal transmission layer can be smoothly pushed and pulled in the supporting protective layer.

In some embodiments, before the S1, the method further comprises:

s0: and pressing a third wire of a predetermined diameter into the metal strip of a predetermined width and thickness at a predetermined pressure.

In some embodiments, the metal strip is a steel strip and the first heat treatment comprises preheating and quenching.

In some embodiments, the pre-heating temperature is 100 ± 20 ℃, and the quenching is completed within 0.5 s.

In some embodiments, the first predetermined hardness is 19 ± 3 degrees and the second predetermined hardness is 45 ± 5 degrees.

In some embodiments, the first and second wires are both steel wires and the second heat treatment comprises tempering.

In some embodiments, the tempering temperature is 100 ± 15 ℃, and the tempering is completed within 0.7 s.

In some embodiments, after the second heat treatment, the hardness of the supporting protective layer, the push-pull transfer layer and the counting positioning layer is HRC 42-52.

In some embodiments, the steel of the metal strip, the first wire, and the second wire is 45-65 gauge steel, respectively.

In some embodiments, between the S2 and the S3 further comprises:

s23: and polishing the inner wall surface of the supporting protection layer smoothly.

In some embodiments, between the S5 and the S6 further comprises:

s56: cleaning the surfaces of the supporting protection layer, the push-pull transmission layer and the counting and positioning layer, performing black rust-proof treatment, and removing oil stains on the surfaces of the supporting protection layer, the push-pull transmission layer and the counting and positioning layer.

In some embodiments, after the S6, the method further comprises:

s7: and pressing and fixing two ends of the signal transmission layer on the connecting accessory.

In some embodiments, the attachment accessory includes a detector for acquiring a core signal.

In some embodiments, the predetermined width and thickness are 0.8 to 2mm and 0.3 to 0.6mm, the first pitch is 0.3 to 0.6mm, the predetermined lead is 12 to 30mm, and the second pitch is 0.5 to 10mm, respectively.

In some embodiments, the diameter of the first wire is greater than the diameter of the second wire.

In some embodiments, the first metal wires have a diameter of 0.3 to 0.5mm, the number of the first metal wires is 5 to 40, and the diameter of the second metal wires is 0.6 to 1 mm.

The invention also provides a flexible shaft for transmitting the signals of the nuclear power station fingerstall tube core, and the flexible shaft is prepared by the preparation method.

The implementation of the invention has at least the following beneficial effects: the flexible shaft in the invention is composed of four layers from inside to outside, has strong flexibility and good trafficability characteristic, and can realize free shuttling with large curvature radius; the flexible shaft has good rigidity and can meet the long-distance push-pull function; the flexible shaft has a signal transmission function, can quantitatively push the core detector into any position of the finger sleeve, collects core signals and remotely transmits the core signals to an upper computer, and ensures the stable operation of the nuclear power core detection system.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic perspective view of a flexible shaft according to some embodiments of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Fig. 1 shows a push-pull flexible shaft for transmitting signals of a thimble core of a nuclear power station according to some embodiments of the present invention, which may include a signal transmission layer 1, a supporting protection layer 2, a push-pull transmission layer 3, and a counting and positioning layer 4 sequentially arranged from inside to outside. The flexible shaft consists of four layers from inside to outside, each layer realizes the independent function, can quantitatively push the core detector into any position of the finger sleeve, collects core signals and remotely transmits the core signals to an upper computer, and ensures the stable operation of the nuclear power core detection system.

The signal transmission layer 1 is used for transmitting signals collected by the sensors to an external upper computer, and in some embodiments, the signal transmission layer may be a copper core wire.

The supporting protective layer 2 is a hollow cylinder with a preset outer diameter and an inner diameter, and has the functions of supporting the framework and protecting the signal transmission layer 1. The inner diameter of the supporting and protecting layer 2 is slightly larger than the outer diameter of the signal transmission layer 1, and the surface of the inner wall is smooth, so that the signal transmission layer 1 can slide smoothly in the supporting and protecting layer 2. The supporting protective layer 2 can be formed by spirally winding a single-layer thin metal strip side by side, and the spirals are not tightly attached to each other, so that the elasticity of the supporting protective layer 2 is improved.

The push-pull transmission layer 3 is tightly attached to the support protection layer 2, can be formed by tightly winding a plurality of first metal wires outside the support protection layer 2 side by side along a preset lead, and is used for transmitting the push-pull force of the flexible shaft and enabling the flexible shaft to have higher flexibility.

The counting and positioning layer 4 is tightly attached to the push-pull transmission layer 3 and can be formed by tightly winding a single-layer second metal wire on the outer surface of the support protection layer 2 side by side at a second pitch. This second pitch can be 0.5 ~ 10mm, for example 2.5mm or 5mm, and the second pitch is regular, and the count of being convenient for can realize the flexible axle at the inside accurate positioning of narrow and small pipeline, and the ration is with detector propelling movement to arbitrary position. Typically, the first wire may be a thin wire of smaller diameter and the second wire may be a thicker wire of larger diameter.

The invention also provides a preparation method for preparing the flexible shaft, which comprises the following steps:

s0: a third wire of a predetermined diameter is pressed at a predetermined pressure into a metal strip of a predetermined width and thickness.

The third metal wire can be steel 45-65 and steel wire with a preset diameter phi of 0.5-1.6 mm, the preset pressure can be 80 +/-10 kN, and the preset width and thickness of the flattened metal strip can be 0.8-2 mm and 0.3-0.6 mm respectively.

It will be appreciated that in other embodiments, the cross-section of the third wire may be square or other shapes. In other embodiments, the metal strip having the predetermined width and thickness may be directly provided, so that the step S0 may be omitted.

S1: the method comprises the steps of carrying out first heat treatment on a metal strip with a preset width and thickness to increase the hardness of the metal strip from a first preset hardness to a second preset hardness.

Wherein, the first preset hardness and the second preset hardness can be respectively 19 +/-3 degrees and 45 +/-5 degrees. The first heat treatment is used to increase the hardness and elasticity of the metal strip, which may include preheating and quenching. Specifically, the metal strip may be preheated to 100 ± 20 ℃ by a heating device such as an electric furnace, and then quenched rapidly within 0.5 s. The quenching medium may be oil or water.

S2: and spirally winding the metal strips subjected to the first heat treatment side by side at a first pitch to form a support protective layer 2 with preset outer diameter and inner diameter.

Wherein, the first thread pitch can be 0.3-0.6 mm, and the preset outer diameter and inner diameter of the supporting protective layer 2 can be respectively phi 1.8-3.7 mm and phi 1.2-2.5 mm.

S3: a plurality of first wires are tightly wound around the outer surface of the support and protection layer 2 side by side along a predetermined lead spiral to form a push-pull transfer layer 3.

Wherein, the first metal wire can be a straight thin steel wire with the steel quality of 45-65 and the diameter of phi 0.3-0.5 mm, and the number of the first metal wire can be 5-40. The preset lead can be 12-30 mm.

S4: a single layer of thicker second wire is helically wound around the outer surface of the push-pull transfer layer 3 at a second pitch to form the counter positioning layer 4.

Wherein, the second metal wire can be steel wire with the steel quality of 45-65 and the diameter of phi 0.6-1 mm, and the second screw pitch can be 0.5-10 mm.

S5: and carrying out second heat treatment on the wound and combined supporting and protecting layer 2, the push-pull transfer layer 3 and the counting and positioning layer 4.

Wherein the second heat treatment comprises tempering. The tempering can be medium temperature tempering, the tempering temperature can be 100 +/-15 ℃, and the tempering can be quickly finished within 0.7 s. After tempering is completed, the hardness of the supporting protective layer 2, the push-pull transfer layer 3 and the counting and positioning layer 4 is HRC 42-52.

S6: the signal transmission layer 1 is arranged in the combined supporting and protecting layer 2 in a penetrating way, so that the signal transmission layer 1 is smoothly pushed and pulled in the supporting and protecting layer 2.

Wherein, the signal transmission layer 1 can be a single signal with a sectional area of 1-2 mm²The copper core wire of (1).

S7: and two ends of the signal transmission layer 1 are pressed and fixed on the connecting accessories, and the pressing is firm.

Wherein the attachment may include a detector for acquiring the core signal.

In some embodiments, between step S2 and step S3, there may be further included:

s23: the inner wall surface of the support protective layer 2 is polished smooth.

Between step S5 and step S6 may further include:

s56: the surfaces of the supporting protection layer 2, the push-pull transfer layer 3 and the counting and positioning layer 4 are cleaned, black rust-proof treatment is carried out, and oil stains on the surfaces of the supporting protection layer 2, the push-pull transfer layer 3 and the counting and positioning layer 4 are removed.

The flexible shaft has a signal transmission function, can detect signals in inaccessible areas and stably transmits the signals to an upper computer; the precise positioning in the narrow pipeline can be realized, and the detector can be quantitatively pushed to any position; the flexible shaft has good rigidity and can meet the long-distance push-pull function; the flexible shaft has strong flexibility and good trafficability characteristic, and can realize free shuttling with large curvature radius; the surface of the flexible shaft is smooth, the inner wall of the finger sleeve cannot be scratched, the flexible shaft is not jammed, and plastic deformation is avoided.

The invention is further illustrated by the following specific examples.

Example (b):

pressing a third metal wire which is made of manganese steel-65 Mn and has a preset diameter of phi 0.8mm into a steel strip with the width of 1.2mm, the thickness of 0.4mm and the hardness of 19 degrees at a preset pressure of 80 kN;

preheating the steel strip to about 100 ℃ through an electric furnace, rapidly finishing quenching within 0.5s, and after quenching, raising the hardness of the steel strip to about 45 ℃;

spirally winding a single layer of the quenched steel strip side by side at a first pitch of 0.4mm to form a support protective layer 2 with preset outer diameter and inner diameter of 2.5mm and 1.7mm respectively;

polishing the inner wall surface of the supporting protective layer 2 smoothly by adopting a 1.5mm peripheral felt steel wire;

tightly winding 20 first metal wires made of manganese steel-65 Mn and having the diameter of about phi 0.4mm on the outer surface of the support protective layer 2 by a preset lead of 20mm in a forced manner to form a push-pull transfer layer 3;

a single-layer material is manganese steel-65 Mn, a second metal wire with the diameter of phi 0.7mm is tightly spirally wound on the outer surface of the push-pull transfer layer 3 in a forced manner at a second screw pitch of 5mm to form a counting and positioning layer 4;

rapidly tempering the wound and combined supporting protective layer 2, the push-pull transfer layer 3 and the counting and positioning layer 4 within 0.7s, wherein the tempering temperature is about 100 ℃;

cleaning the surfaces of the supporting protection layer 2, the push-pull transfer layer 3 and the counting and positioning layer 4, performing black rust-proof treatment, and removing oil stains on the surfaces of the supporting protection layer 2, the push-pull transfer layer 3 and the counting and positioning layer 4;

a signal transmission layer 1 (the section area of a single part is about 1.5 mm)²The copper core wire) is arranged in the combined supporting and protecting layer 2 in a penetrating way, so that the signal transmission layer 1 is smoothly pushed and pulled in the supporting and protecting layer 2;

and two ends of the signal transmission layer 1 are pressed and fixed on the connecting accessories, and the pressing is firm.

So far, the flexible shaft of the invention is manufactured. The maximum effective diameter of the flexible shaft is about 4.7mm, the flexible shaft can freely enter the inside of a nuclear power station reactor thimble (the inner diameter is phi 5.2mm), core signals are collected and transmitted to an upper computer in a long distance, and the stable operation of a nuclear power core detection system is effectively guaranteed.

It is to be understood that the above-described respective technical features may be used in any combination without limitation.

The above examples only express the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A preparation method of a flexible shaft for transmitting a nuclear power station fingerstall core signal is characterized by comprising the following steps:

s2: spirally winding the metal strip subjected to the first heat treatment side by side at a first pitch to form a support protective layer (2) with a preset outer diameter and inner diameter;

s3: tightly winding a plurality of first metal wires on the outer surface of the support protection layer (2) side by side along a preset lead in a spiral manner to form a push-pull transmission layer (3);

s4: tightly and spirally winding a second metal wire on the outer surface of the push-pull transmission layer (3) at a second screw pitch to form a counting positioning layer (4);

s5: carrying out second heat treatment on the wound and combined supporting and protecting layer (2), the push-pull transfer layer (3) and the counting and positioning layer (4);

s6: and the signal transmission layer (1) is arranged in the supporting protective layer (2) in a penetrating way, so that the signal transmission layer (1) is smoothly pushed and pulled in the supporting protective layer (2).

2. The method of claim 1, further comprising, prior to the step of S1:

3. The method of claim 1, wherein the metal strip is a steel strip and the first heat treatment comprises preheating and quenching.

4. The method of claim 3, wherein the preheating temperature is 100 ± 20 ℃, and the quenching is completed within 0.5 s.

5. The method of claim 3, wherein the first predetermined hardness is 19 ± 3 degrees and the second predetermined hardness is 45 ± 5 degrees.

6. The method according to claim 3, wherein the first metal wire and the second metal wire are both steel wires, and the second heat treatment includes tempering.

7. The method of claim 6, wherein the tempering temperature is 100 ± 15 ℃, and the tempering is completed within 0.7 s.

8. The manufacturing method according to claim 6, wherein after the second heat treatment, the hardness of the supporting and protecting layer (2), the push-pull transfer layer (3) and the counting and positioning layer (4) is HRC 42-52.

9. The method according to any one of claims 1 to 8, wherein the steel of the metal strip, the first wire and the second wire is 45 to 65 steel, respectively.

10. The method of any one of claims 1-8, further comprising, between the S2 and the S3:

s23: and polishing the inner wall surface of the supporting protection layer (2) smoothly.

11. The method of any one of claims 1-8, further comprising, between the S5 and the S6:

s56: cleaning the surfaces of the supporting protection layer (2), the push-pull transmission layer (3) and the counting and positioning layer (4), performing black rust-proof treatment, and removing oil stains on the surfaces of the supporting protection layer (2), the push-pull transmission layer (3) and the counting and positioning layer (4).

12. The method according to any one of claims 1 to 8, further comprising, after the step of S6:

s7: and pressing and fixing two ends of the signal transmission layer (1) on a connecting accessory.

13. The method of claim 12, wherein the attachment accessory includes a probe for acquiring a core signal.

14. The method of any one of claims 1 to 8, wherein the predetermined width and thickness are 0.8 to 2mm and 0.3 to 0.6mm, respectively, the first pitch is 0.3 to 0.6mm, the predetermined lead is 12 to 30mm, and the second pitch is 0.5 to 10 mm.

15. The production method according to any one of claims 1 to 8, wherein the diameter of the first wire is larger than the diameter of the second wire.

16. The method of manufacturing according to claim 15, wherein the diameter of the first metal wire is 0.3 to 0.5mm, the number of the first metal wires is 5 to 40, and the diameter of the second metal wire is 0.6 to 1 mm.

17. A flexible shaft for transmitting signals of a nuclear power station fingerstall core, which is characterized in that the flexible shaft is manufactured by the preparation method of any one of claims 1 to 16.