CN111261339A - A kind of cable processing method - Google Patents

Abstract

The invention discloses a cable processing method, which comprises: preparing a cable core conductor layer of a cable to be processed; preparing a corresponding conductor shielding layer; preparing a corresponding insulating layer to wrap the outer side of the conductor shielding layer; preparing a corresponding insulating shielding layer layer is wrapped on the outside of the insulating layer; high thermal conductivity particles are added to the epoxy resin base material; the cable to be processed wrapped with the insulating shielding layer is wound on a reel, and the reel is controlled to operate The cable to be processed is immersed in the soaking tank; the cable to be processed in the soaking tank is pulled in a vertical direction, dried naturally and then placed in a baking box for heating treatment. In the cable processing method provided by the present invention, a film layer with high thermal conductivity is constructed by filling the epoxy resin substrate with high thermal conductivity filling particles, which ensures that the entire cable has better electrical performance, shielding performance and thermal conductivity. The method steps are clear, which greatly facilitates the production and processing flow of the cable.

Description

A kind of cable processing method

technical field

The invention relates to the technical field of power cable manufacturing, in particular to a cable processing method.

Background technique

Line cables are composed of multi-layer coaxial structures, each of which has a different function, ensuring the stable transmission of current or electromagnetic waves, light waves, etc. transmitted by the conductor core, and also ensuring the safety of external objects and people.

In practical applications, the structure of each layer of the line cable will generate different degrees of heating due to the large current passing through it for a long time. This heating phenomenon will cause the overall temperature of the cable to rise rapidly, affecting the shielding performance of the cable shielding layer. At the same time, The temperature rise will also accelerate the aging of the cable insulation material, and in severe cases, the cable insulation may be broken down and cause a fire accident. Nowadays, in order to protect the cable, the measures taken are to reduce the current flowing through the conductor to ensure that the temperature of the entire line cable is within a safe range. With the continuous expansion of the scale of industries such as mining, coal mining, automobile industry, and shipbuilding, the demand for transmission lines has also increased exponentially. Reducing the current flowing through the conductors will limit the electrical performance of the entire transmission line, resulting in its inability to meet On the other hand, in the operation mode of high load and high current, the effect of regulating temperature simply by reducing the current is also very limited.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a cable processing method that can stably conduct the heat generated by the line cable and ensure the electrical performance of the cable.

In order to achieve the above object, an embodiment of the present invention provides a cable processing method, which includes the following steps:

The metal wire is subjected to impurity removal, wire drawing and de-hardening treatment to form the cable core conductor layer of the cable to be processed;

Mixing and heating the conductor shielding material, and wrapping it on the conductor layer of the cable core by a winding mechanism to form a corresponding conductor shielding layer;

Filtering, removing impurities and plasticizing the insulating material to form a corresponding insulating layer wrapped around the outer side of the conductor shielding layer;

The insulating shielding material is pre-processed and cured to form a corresponding insulating shielding layer wrapped on the outside of the insulating layer;

Add high thermal conductivity particles to the epoxy resin substrate, mix, degas and add it to the soaking tank to stand;

Winding the cable to be processed wrapped with the insulating shielding layer on a reel, and controlling the operation of the reel so that the cable to be processed is immersed in the soaking tank;

The cable to be processed in the soaking tank is pulled in a vertical direction, dried naturally, and then placed in a baking box for heating treatment.

As an improvement of the above solution, the metal wire is a copper alloy metal wire or an aluminum alloy metal wire.

As an improvement of the above solution, the high thermal conductivity particles include at least one of the following particles: boron nitride filled particles, aluminum nitride filled particles, silicon carbide filled particles, and boron carbide filled particles.

As an improvement of the above solution, the conductor shielding material includes a polyolefin and carbon black conductive composite material.

As an improvement of the above solution, the insulating material includes cross-linked polyethylene, polyethylene and polypropylene.

As an improvement of the above solution, the insulating shielding material includes a silicone rubber material.

As an improvement of the above solution, the silicone rubber material is methyl vinyl silicone rubber.

As an improvement of the above solution, the immersion time of the cable to be processed in the immersion tank is 2 to 3 hours.

As an improvement of the above scheme, the heating temperature of the baking box is 90-140° C., and the heating-treatment time of the baking box is 30-40 minutes.

In the cable processing method provided by the present invention, by adopting specific method steps, a plurality of coaxial structures with specific functions of the conductor, the conductor shielding layer, the insulating layer, the insulating shielding layer and the film layer are constructed from the inside to the outside, so as to ensure that the cable has a relatively high performance. At the same time, by filling the epoxy resin substrate with high thermal conductivity filler particles, a film layer with high thermal conductivity is constructed, so that the line cable can combine the conductors, conductor shielding layers, insulating layers and insulating shielding layers. The heat accumulated by the structure is stably dissipated, thereby reducing the temperature of the entire cable, preventing the insulation layer from being broken down, and the operating load of the transmission line will not drop. At the same time, the multi-layer cable structure also enhances the shielding effect. The whole cable processing method has clear steps, and the production process is simplified, which greatly facilitates the production and processing flow of the cable.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the following will briefly introduce the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, which are common in the art. As far as technical personnel are concerned, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic flowchart of a cable processing method provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

An embodiment of the present invention provides a cable processing method. Specifically, please refer to FIG. 1 , which is a schematic flowchart of a cable processing method provided by an embodiment of the present invention, which includes the following steps:

S101, the metal wire is subjected to impurity removal, wire drawing and de-hardening treatment, so as to form the cable core conductor layer of the cable to be processed, so as to ensure that the conductor layer has better electrical properties;

S102. Mix and heat the conductor shielding material, and wrap it on the conductor layer of the cable core through a winding mechanism to form a corresponding conductor shielding layer, so as to ensure that the conductor shielding layer has better electrical properties ;

S103, filtering, removing impurities and plasticizing the insulating material, so as to form a corresponding insulating layer wrapped around the outer side of the conductor shielding layer, so as to ensure that the insulating layer has stable working performance;

S104, pre-processing and curing the insulating shielding material, so as to form a corresponding insulating shielding layer wrapped around the outer side of the insulating layer, so as to ensure that the insulating shielding layer has stable working performance;

S105, adding high thermal conductivity particles to the epoxy resin substrate, mixing, degassing, and adding them to the soaking tank to stand;

S106, winding the cable to be processed wrapped with the insulating shielding layer on a reel, and controlling the operation of the reel so that the cable to be processed is immersed in the soaking tank;

S107, the cable to be processed in the soaking tank is pulled in a vertical direction, and after being naturally dried, it is placed in a baking box for heating treatment to form a corresponding thin film layer.

It should be noted that the material system of the film layer is constructed by using an epoxy resin base material, and filled with high thermal conductivity filler particles, so that the entire film layer has a high thermal conductivity, so that the internal layers of the line cable can be structured. The heat is stably exported. In the actual production and processing process, the film layer prepared by the soaking tank should be adjusted according to the optimized characteristics of the entire cable. Parameters such as position and area. Of course, in addition to soaking in a soaking tank, you can also refer to the spraying method in the prior art, place a specific area of the cable in a vacuum environment, and spray the above-mentioned material system on its surface area; The layered film is naturally dried, then placed in an oven, heated for a certain period of time, taken out, and cooled to complete the preparation of the high thermal conductivity cable film layer. film.

In the cable processing method provided by the embodiment of the present invention, by adopting specific method steps, a plurality of coaxial structures with specific functions of the inner conductor, the conductor shielding layer, the insulating layer, the insulating shielding layer and the thin film layer are gradually constructed, ensuring that The cable has better electrical properties. At the same time, by filling the epoxy resin substrate with high thermal conductivity filler particles, a film layer with high thermal conductivity is constructed, so that the line cable can combine conductors, conductor shielding layers, insulating layers and insulating shielding layers. The heat accumulated by each layer of the structure is stably exported, thereby reducing the temperature of the entire cable, preventing the insulation layer from being broken down, and the operating load of the transmission line will not drop. At the same time, the multi-layer cable structure also enhances the shielding effect. The whole cable processing method has clear steps, and the production process is simplified, which greatly facilitates the production and processing flow of the cable.

Preferably, in the above embodiment, the metal wire is a copper alloy metal wire or an aluminum alloy metal wire, which has high mechanical tensile strength and oxidation resistance.

Preferably, in the above embodiment, the high thermal conductivity particles include at least one of the following particles: boron nitride filled particles, aluminum nitride filled particles, silicon carbide filled particles and boron carbide filled particles. Filled particles such as BN boron nitride have high thermal conductivity and can stably conduct heat from the entire cable.

Preferably, in the above embodiment, the conductor shielding material includes a polyolefin and carbon black conductive composite material. The main function of the conductor shielding layer is to homogenize the electric field on the surface of the conductor and prevent partial discharges caused by the gap between the conductor and the insulating layer.

Preferably, in the above embodiment, the insulating material includes cross-linked polyethylene, polyethylene and polypropylene. Among them, cross-linked polyethylene (XLPE) has many advantages such as light specific gravity, convenient laying and corrosion resistance. After polymer cross-linking, it becomes a thermosetting material, and its mechanical properties and heat resistance are also very good.

Preferably, in the above embodiment, the insulating shielding material includes a silicone rubber material. The main function of the insulating shielding layer is to uniformly insulate the outer surface electric field and protect the insulation from damage.

Preferably, in the above embodiment, the silicone rubber material is methyl vinyl silicone rubber. Methyl vinyl silicone rubber is selected as the main material of the insulating shielding layer, using its good high temperature resistance, supplemented by the auxiliary materials of specific proportions in the prior art, to ensure that the cable has better temperature characteristics, suitable for the actual needs of different occasions.

Preferably, in the above embodiment, the immersion time of the cable to be processed in the immersion tank is 2-3 hours.

Preferably, in the above embodiment, the heating temperature of the baking box is 90-140° C., and the heating time of the baking box is 30-40 min.

In the cable processing method provided by the embodiment of the present invention, by adopting specific method steps, a plurality of coaxial structures with specific functions are constructed from the inside to the outside of the conductor, the conductor shielding layer, the insulating layer, the insulating shielding layer and the film layer, so as to ensure that the cable is It has better electrical properties, and at the same time, by filling the epoxy resin substrate with high thermal conductivity particles, a film layer with high thermal conductivity is constructed, so that the line cable can combine the conductor, conductor shielding layer, insulating layer and insulating shielding layer. The heat accumulated by the layer structure is stably dissipated, thereby reducing the temperature of the entire cable, preventing the insulation layer from being broken down, and the operating load of the transmission line will not drop. At the same time, the multi-layer cable structure also enhances the shielding effect. The whole cable processing method has clear steps, and the production process is simplified, which greatly facilitates the production and processing flow of the cable.

The above disclosures are only some preferred embodiments of the present invention, which of course cannot limit the scope of the rights of the present invention. Those of ordinary skill in the art can understand all or part of the process of implementing the above embodiments, and follow the claims of the present invention. The equivalent changes made still belong to the scope covered by the invention.

Claims (9)

1. A cable processing method is characterized by comprising the following steps:

removing impurities, drawing wires and hardening the metal wires to form a cable core conductor layer of the cable to be processed;

mixing and heating the conductor shielding material, and wrapping the conductor shielding material on the conductor layer of the cable core through a winding mechanism to form a corresponding conductor shielding layer;

filtering, impurity removing and plasticizing the insulating material to form a corresponding insulating layer to wrap the outer side of the conductor shielding layer;

preprocessing and curing the insulating shielding material to form a corresponding insulating shielding layer to wrap the outside of the insulating layer;

adding high-thermal-conductivity particles into an epoxy resin base material, mixing, degassing, adding the mixture into a soaking pool, and standing;

winding the cable to be processed wrapped with the insulation shielding layer on a winding machine, and controlling the winding machine to operate so as to enable the cable to be processed to be immersed in the soaking pool;

and lifting the cable to be processed in the soaking pool in a vertical direction, naturally airing the cable, and then putting the cable into a baking oven for heating treatment.

2. The cable processing method according to claim 1, wherein the metal wire is a copper alloy metal wire or an aluminum alloy metal wire.

3. The cable processing method according to claim 1, wherein the high thermal conductivity particles comprise at least one of the following particles: boron nitride filler particles, aluminum nitride filler particles, silicon carbide filler particles, and boron carbide filler particles.

4. The cable processing method of claim 1, wherein the conductor shield comprises a polyolefin and carbon black conductive composite.

5. The method of claim 1, wherein the insulation material comprises crosslinked polyethylene, polyethylene and polypropylene.

6. The cable processing method of claim 1, wherein the insulation shield comprises a silicone rubber material.

7. The cable processing method according to claim 6, wherein the silicone rubber material is methyl vinyl silicone rubber.

8. The cable processing method according to claim 1, wherein the immersion time of the cable to be processed in the immersion tank is 2 to 3 hours.

9. The cable processing method according to claim 1, wherein the heating temperature of the baking oven is 90 to 140 ℃, and the heating time of the baking oven is 30 to 40 min.

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