阅读说明：本技术 一种阻燃电缆保护层的制备方法 (Preparation method of flame-retardant cable protective layer ) 是由 徐经纬 郭勇 陈平强 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种阻燃电缆保护层的制备方法,通过采用压制工艺在聚乙烯材质的保护层内内置多层钢珠,使保护层具有更高的强度,在较强力度的冲击下也能保持较好的形态,克服了现有阻燃电缆保护层强度不够,在遭遇较强冲击时,保护层容易被破坏,导致电缆暴露在外,使电缆容易遭受损坏,且具有一定的危险性的问题。(The invention discloses a preparation method of a flame-retardant cable protective layer, which is characterized in that a pressing process is adopted to embed a plurality of layers of steel balls in a polyethylene protective layer, so that the protective layer has higher strength and can keep a better form under strong impact, and the problems that the conventional flame-retardant cable protective layer has insufficient strength, and the protective layer is easily damaged when the conventional flame-retardant cable is subjected to strong impact, so that the cable is easily damaged and has certain danger are solved.)

1. A preparation method of a flame-retardant cable protective layer is characterized by comprising the following steps: the method comprises the following steps:

(1) manufacturing a long-strip-shaped protective layer base material by using polyethylene, wherein the width of the protective layer base material is 2-4 cm, the thickness of the protective layer base material is 0.3-0.6 mm, after the protective layer base material is manufactured, stamping a plurality of hemispherical grooves on one side of the protective layer base material by using a stamping die, then placing steel balls in the hemispherical grooves, after the placement is finished, pressing the steel balls into the protective layer by using pressing equipment, then removing the pressing equipment, placing the steel balls in the hemispherical grooves again, and pressing the steel balls into the protective layer by using the pressing equipment again;

(2) after pressing is finished, heating polyethylene to a molten state, pouring the molten polyethylene into the hemispherical groove, sealing a hole formed when the steel balls are pressed, wherein the polyethylene should overflow from the hole to the outer side of the hole when pouring is carried out, so that the hole is completely sealed by the polyethylene, then placing the protective layer base material at a ventilation position for airing, and grinding the polyethylene protruding from the hole to be flat after airing;

(3) enclosing the protective layer substrate into a long tube shape to obtain the protective layer.

2. The method for preparing a flame-retardant cable protective layer according to claim 1, wherein the method comprises the following steps: in the step (1), the diameter of the hemispherical groove is 3-5 mm, and the diameter of the steel ball placed in the hemispherical groove is 2-3 mm.

3. The method for preparing a flame-retardant cable protective layer according to claim 1, wherein the method comprises the following steps: in the step (1), the diameter of the hemispherical groove is 5 mm, and the diameter of the steel ball placed in the hemispherical groove is 3 mm.

4. The method for preparing a flame-retardant cable protective layer according to claim 1, wherein the method comprises the following steps: in the step (3), when the protective layer base material is enclosed into a long tube shape, the metal strip is inserted into the gap at the enclosed position of the protective layer base material, then the metal strip is heated, and the protective layer base material at the two sides of the gap at the enclosed position is melted and fused under the high-temperature action of the metal strip, so that the tubular shape of the protective layer base material is fixed.

5. The method for preparing a flame-retardant cable protective layer according to claim 4, wherein the method comprises the following steps: the metal strip is an iron strip, the diameter of the iron strip is 2 millimeters, and the length of the metal strip is the same as that of the protective layer base material.

6. The method for preparing a flame-retardant cable protective layer according to claim 1, wherein the method comprises the following steps: in the step (2), the heating temperature of the polyethylene is 260 ℃ to 300 ℃.

7. The method for preparing a flame-retardant cable protective layer according to claim 1, wherein the method comprises the following steps: in the step (2), the polyethylene protruding from the hole is firstly removed by a scraper knife, and then the rest polyethylene is polished by using sand paper.

8. The method for preparing a flame-retardant cable protective layer according to claim 7, wherein the method comprises the following steps: after the polishing of the rest polyethylene is finished, the hole opening is completely polished.

Technical Field

The invention relates to the field of cables, in particular to a preparation method of a flame-retardant cable protective layer.

Background

Cables are generally formed by twisting several or groups of at least two conductors, each group insulated from each other and often twisted around a center, with a highly insulating covering the entire outside. The cable has the characteristics of internal electrification and external insulation.

The existing flame-retardant cable protective layer is not high enough in strength, and when the cable is subjected to strong impact, the protective layer is easily damaged, so that the cable is exposed to the outside, and the cable is easily damaged and has certain dangerousness.

Disclosure of Invention

The invention aims to provide a preparation method of a flame-retardant cable protective layer, which aims to solve the technical problems.

In order to solve the technical problems, the invention adopts the following technical scheme:

a preparation method of a flame-retardant cable protective layer comprises the following steps:

(1) manufacturing a long-strip-shaped protective layer base material by using polyethylene, wherein the width of the protective layer base material is 2-4 cm, the thickness of the protective layer base material is 0.3-0.6 mm, after the protective layer base material is manufactured, stamping a plurality of hemispherical grooves on one side of the protective layer base material by using a stamping die, then placing steel balls in the hemispherical grooves, after the placement is finished, pressing the steel balls into the protective layer by using pressing equipment, then removing the pressing equipment, placing the steel balls in the hemispherical grooves again, and pressing the steel balls into the protective layer by using the pressing equipment again;

(2) after pressing is finished, heating polyethylene to a molten state, pouring the molten polyethylene into the hemispherical groove, sealing a hole formed when the steel balls are pressed, wherein the polyethylene should overflow from the hole to the outer side of the hole when pouring is carried out, so that the hole is completely sealed by the polyethylene, then placing the protective layer base material at a ventilation position for airing, and grinding the polyethylene protruding from the hole to be flat after airing;

(3) enclosing the protective layer substrate into a long tube shape to obtain the protective layer.

Preferably, in the step (1), the diameter of the hemispherical groove is 3-5 mm, and the diameter of the steel ball placed in the hemispherical groove is 2-3 mm.

Preferably, in the step (1), the diameter of the hemispherical groove is 5 mm, and the diameter of the steel ball placed in the hemispherical groove is 3 mm.

Preferably, in the step (3), when the protective layer base material is enclosed into a long tube shape, the metal strip is inserted into the gap at the enclosed position of the protective layer base material, then the metal strip is heated, and the protective layer base material at two sides of the gap at the enclosed position is melted and fused under the high-temperature action of the metal strip, so that the tubular shape of the protective layer base material is fixed.

Preferably, the metal strip is an iron strip, the diameter of the iron strip is 2 millimeters, and the length of the metal strip is the same as that of the protective layer base material.

Preferably, in the step (2), the polyethylene heating temperature is 260-300 ℃.

Preferably, in the step (2), the polyethylene protruding from the hole is firstly removed by a scraper knife, and then the rest polyethylene is polished by using sandpaper.

Preferably, after finishing the polishing of the rest of the polyethylene, the hole should be completely polished.

The invention has the beneficial effects that:

1. according to the invention, the multilayer steel balls are arranged in the polyethylene protective layer by adopting a pressing process, so that the protective layer has higher strength and can keep a better form under strong impact, and the problems that the conventional flame-retardant cable protective layer has insufficient strength, and the protective layer is easily damaged when strong impact is encountered, so that the cable is exposed, is easily damaged and has certain danger are solved.

2. The metal strip is inserted into the gap at the enclosing position of the protective layer base material, and the metal strip is heated, so that the enclosing position of the protective layer base material is melted and fused, and the connecting position of the enclosing position of the protective layer base material is tighter.

Detailed Description

The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

A preparation method of a flame-retardant cable protective layer comprises the following steps:

(1) manufacturing a long-strip-shaped protective layer base material by using polyethylene, wherein the width of the protective layer base material is 2-4 cm, the thickness of the protective layer base material is 0.3-0.6 mm, after the protective layer base material is manufactured, stamping a plurality of hemispherical grooves on one side of the protective layer base material by using a stamping die, then placing steel balls in the hemispherical grooves, after the placement is finished, pressing the steel balls into the protective layer by using pressing equipment, then removing the pressing equipment, placing the steel balls in the hemispherical grooves again, and pressing the steel balls into the protective layer by using the pressing equipment again;

(2) after pressing is finished, heating polyethylene to a molten state, pouring the molten polyethylene into the hemispherical groove, sealing a hole formed when the steel balls are pressed, wherein the polyethylene should overflow from the hole to the outer side of the hole when pouring is carried out, so that the hole is completely sealed by the polyethylene, then placing the protective layer base material at a ventilation position for airing, and grinding the polyethylene protruding from the hole to be flat after airing;

(3) enclosing the protective layer substrate into a long tube shape to obtain the protective layer.

In the step (1), the diameter of the hemispherical groove is 3-5 mm, and the diameter of the steel ball placed in the hemispherical groove is 2-3 mm.

In the step (1), the diameter of the hemispherical groove is 5 mm, and the diameter of the steel ball placed in the hemispherical groove is 3 mm.

In the step (3), when the protective layer base material is enclosed into a long tube shape, the metal strip is inserted into the gap at the enclosed position of the protective layer base material, then the metal strip is heated, and the protective layer base material at the two sides of the gap at the enclosed position is melted and fused under the high-temperature action of the metal strip, so that the tubular shape of the protective layer base material is fixed.

The metal strip is an iron strip, the diameter of the iron strip is 2 millimeters, and the length of the metal strip is the same as that of the protective layer base material.

In the step (2), the polyethylene heating temperature is 260 ℃ to 300 ℃.

In the step (2), the polyethylene protruding from the hole is firstly removed by a scraper knife, and then the rest polyethylene is polished by using sand paper.

After the polishing of the rest polyethylene is finished, the hole opening is completely polished.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.