CN110993194A

CN110993194A - Cable and production process thereof

Info

Publication number: CN110993194A
Application number: CN201911380646.6A
Authority: CN
Inventors: 范红磊; 朱雯华
Original assignee: New H3C Technologies Co Ltd Hefei Branch
Current assignee: New H3C Technologies Co Ltd Hefei Branch
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-04-10

Abstract

The embodiment of the invention discloses a cable and a production process thereof, relating to the field of cables. The production process of the cable comprises the steps of winding an insulating strip around the periphery of a stranded conductor, wherein each circle of the insulating strip wound on the stranded conductor is overlapped; and cooling the stranded conductor wound with the insulating strip, and completely closing the stranded conductor through the insulating strips overlapped with each other to form an insulating layer. The cable production process has the characteristics of simple steps and easiness in operation, and can reduce the outer diameter of the cable manufactured by the process, improve the bending performance and improve the temperature resistance grade of the product. The outer diameter of the cable is small, the dielectric property and the temperature resistance level are high, the bending property is superior, and the type selection requirement of wiring inside the miniaturized equipment is favorably met.

Description

Cable and production process thereof

Technical Field

The invention relates to the field of cables, in particular to a cable and a production process thereof.

Background

The principle of the cable is that a screw rod with a specific shape rotates in a heated cylinder, plastic sent from a hopper is extruded forwards to be uniformly plasticized (namely melted), the plastic is extruded into a continuous plastic layer to be extruded and coated on a conductor through a machine head and dies with different shapes to form a continuous compact tubular insulating layer, and then the insulating layer is cooled and solidified through a water tank to prepare a cable product. This process is comparatively complicated, and the structural dimension of the cable of making simultaneously is great, is unfavorable for equipment miniaturization internal wiring to walk line and the requirement of lectotype.

Disclosure of Invention

The invention aims to provide a cable and a production process thereof, wherein the cable has smaller structural size, higher dielectric property and temperature resistance level and more excellent bending property, and is favorable for meeting the requirements of miniaturization and internal wiring of equipment and type selection.

Embodiments of the invention may be implemented as follows:

in a first aspect, an embodiment provides a cable production process, including:

winding an insulating strip around the stranded conductor, wherein each turn of the insulating strip wound around the stranded conductor overlaps with each other;

and cooling the stranded conductor wound with the insulating strip, and completely closing the stranded conductor through the insulating strip with the mutually overlapped covers to form an insulating layer.

In an alternative embodiment, the overlapping rate of the insulating tape wound on the stranded conductor is 20% -60% per one turn.

In an alternative embodiment, the overlap ratio is 50%.

In an alternative embodiment, the insulating tape is a self-adhesive insulating tape;

the step of winding the insulating tape around the periphery of the stranded conductor comprises:

heating the insulating strip at the film outlet end of the insulating strip;

winding the heated insulating strip around the periphery of the stranded conductor;

the step of cooling the stranded conductor wound with the insulating tape and completely closing the stranded conductor by the insulating tape overlapping each other includes:

and cooling the stranded conductor wound with the insulating strip by an air cooler so as to adhere the parts of the overlapping covers of the insulating strips and completely seal the stranded conductor.

In an optional embodiment, the step of heating the insulating tape at the film outlet end of the insulating tape includes:

and heating the insulating strip by an air heater arranged at the film outlet end.

In an alternative embodiment, the step of heating the insulating tape at the film outlet end of the insulating tape includes:

and heating the insulating strip passing through the heating ring by the heating ring arranged at the film outlet end.

In an alternative embodiment, the insulating tape is a heat-shrinkable insulating tape;

after the insulation strip is wound around the periphery of the stranded conductor, the method further comprises:

heating the stranded conductor wound with the insulating strip through a hollow heating pipe so that the insulating strip is heated to shrink;

and cooling the stranded conductor wound with the insulating strip by an air cooler so as to ensure that the parts of the insulating strips, which are mutually overlapped and covered, shrink and fasten, and completely seal the stranded conductor.

In an alternative embodiment, the heating temperature is 70-150 degrees celsius when heating is performed by the hollow heating tube.

In an alternative embodiment, the thickness of the insulating tape is less than 0.042 mm.

In a second aspect, embodiments provide a cable comprising: a stranded conductor and an insulation layer;

the insulating layer is formed on the peripheral surface of the stranded conductor through an insulating strip by any one of the processes.

The beneficial effects of the embodiment of the invention include, for example: the stranded conductor is integrally coated by winding an insulating strip around the periphery of the stranded conductor so that the insulating strips wound on the stranded conductor in each turn overlap each other. And cooling the stranded conductor wound with the insulating strip and the insulating strip, sealing the mutually overlapped insulating conductors and fixing the mutually overlapped insulating conductors at the periphery of the stranded conductor to form an insulating layer of the cable, and finishing the production process of the cable. Compared with the prior art in which extrusion molding is adopted, the embodiment of the invention has the characteristics of fewer steps and easiness in implementation. And, the structure size of the cable of making is littleer, and dielectric property and temperature resistant grade are higher, and bending property is more superior, is favorable to satisfying the type selection demand that equipment miniaturization internal wiring was walked the line.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of a cable structure manufactured using a prior art manufacturing process;

FIG. 2 is a schematic block diagram of a process for producing a cable according to an embodiment of the present invention;

fig. 3 is a schematic view of a wrapping process of a cable production process according to an embodiment of the invention;

fig. 4 is a schematic structural view of a cable manufactured by the cable manufacturing process according to the embodiment of the present invention;

FIG. 5 is a block diagram illustrating a flow of substeps of step S100 and step S200 of FIG. 2;

FIG. 6 is a schematic flow chart illustrating the sub-steps of step S100 in FIG. 5;

FIG. 7 is a schematic block diagram of a process when the insulating film is a heat shrinkable insulating film according to another embodiment of the present invention;

fig. 8 is a schematic flowchart of the process in step S300 in fig. 7.

Icon: 100-cable construction; 110-a conductor; 120-an insulating layer; 200-a cable; 210-a stranded conductor; 220-an insulating layer; 230-insulating tape.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Fig. 1 shows a schematic structural diagram of a conventional cable structure 100, which includes a conductor 110 and an insulating layer 120 covering the conductor 110. The cable structure 100 may be used in an electronic device or a communication device, such as a power line, a network cable, a high-speed line outside the device, or a signal line electronic line inside the device, where the cable has a large variety and complicated wiring paths, and especially in the communication device, the requirements for the bending performance of the cable and the volume and outer diameter of the cable are more strict.

As communication speed requirements become higher and higher, the configuration of communication equipment products becomes more and more complex, and the space available for wiring within the equipment becomes smaller and smaller. Saving space will become the first requirement of industrial cable industry, equipment manufacturer, and the limitation of space directly affects the limitation and compactness of wiring. The limitation has higher requirements on the structural size of the cable and the bending radius of the cable; the temperature rise of compactness to the cable influences greatly, and then influences the current-carrying capacity of cable, so the improvement of cable temperature resistant grade becomes the most crucial attached demand of future industry cable.

In the production process of the cable structure 100: the insulating layer 120 is manufactured by an extrusion molding process, which is based on the principle that a screw rod with a specific shape rotates in a heated cylinder, plastic fed from a hopper is extruded forwards to be uniformly plasticized (i.e., melted), the plastic is extruded into a continuous plastic layer to be extruded and coated on the conductor 110 through a machine head and dies with different shapes to form the continuous, compact and tubular insulating layer 120, and then the insulating layer 120 is cooled and solidified through a water tank to form the cable structure 100 coated with the insulating layer 120 as shown in fig. 1.

The cable structure 100 manufactured by the above manufacturing process has disadvantages in that the structure is large in size, and occupies a large space of equipment, and the bending effect is reduced due to the increase in size. The cable production process provided by the embodiment of the invention can be used for manufacturing the cable 200 (fig. 4) with smaller structural size and good bending performance, and the cable 200 is favorable for the miniaturization wiring and routing requirements of equipment.

Referring to fig. 2 and fig. 3, a cable production process according to an embodiment of the present invention includes a step S100 and a step S200.

Step S100: an insulating tape 230 is wound around the circumferential side of the stranded conductor 210, wherein each turn of the insulating tape 230 wound around the stranded conductor 210 overlaps with each other.

Before the step S100, a conductor twisting step is performed to manufacture a twisted conductor, so that the conductor is softened and the bending performance is improved. The conductor can be made of a plated copper wire or a non-plated copper wire, the type of the conductor refers to a category 6 soft conductor in GB/T3956-2008 cable conductors, softness and stranded monofilaments are not higher than the category 6 soft conductor specified in the standard, and the purpose is to improve bending performance of the finished cable.

Step S100 may be performed by wrapping the insulating tape 230 around the stranded conductor 210 through a wrapping process, and fig. 3 is a schematic diagram of the stranded conductor 210 wrapping the insulating tape 230, where arrows indicate a flow direction of the cable production process, and as shown in fig. 3, the flow of the cable production process is performed from right to left: an insulation tape 230 is wrapped around the circumferential side of the stranded conductor 210, and the wrapped insulation tape 230 overlaps the stranded conductor 210. The insulating tape 230 may be heated before being wound around the stranded conductor 210 and wound around the stranded conductor 210 after being heated; alternatively, after the insulation tape 230 is wound around the stranded conductor 210, the stranded conductor 210 around which the insulation tape 230 is wound is heated.

In an alternative embodiment, the overlapping rate of the insulating tape 230 wound on the stranded conductor 210 per one turn is 20% -60%. It should be noted that the overlapping rate of the insulating tapes 230 refers to the ratio of the overlapping portion of two adjacent turns of the insulating tape 230 wound on the stranded conductor 210 to the overlapping portion of the insulating tape 230 wound on the previous turn of the stranded conductor 210. The overlapping rate affects the dielectric property and the soft bending property of the cable, and in the embodiment of the present invention, the overlapping rate of each turn of the insulating tape 230 wound on the stranded conductor 210 ranges from 20% to 60%, such as 30%, 40%, etc.

Further, in an alternative embodiment, the overlapping rate of each turn of the insulating tape 230 wound on the stranded conductor 210 is 50%, that is, the insulating tape 230 of the next turn overlaps half of the insulating tape 230 of the previous turn, that is, the insulating tapes 230 spaced by one turn are parallel to each other, and two layers of insulating tapes 230 can be formed on the surface of the stranded conductor 210, that is, the insulating layer 220 is overlapped by the two layers of insulating tapes 230, so as to ensure the uniform thickness of the insulating layer 220 and the alignment of the outer circumferential surface of the cable 200, and to make the dielectric property and the flexible bending property of the manufactured cable 200 have good consistency.

Step S200: the twisted conductor 210 wound with the insulation tape 230 is cooled, and the insulation layer 220 is formed by completely closing the twisted conductor 210 with the overlapping insulation tape 230.

In step S200, the insulation tape 230 wound on the stranded conductor 210 and the stranded conductor 210 are cooled to completely enclose the insulation tape 230 on the peripheral side of the stranded conductor 210, so as to form an insulation layer, thereby completing the production of the cable 200.

The cables 200 may be wound onto a storage stand by a take-up device in a subsequent step to facilitate handling and transportation of the cables 200.

In an alternative embodiment, the insulating tape 230 may be a self-adhesive insulating tape 230; referring to fig. 5, a schematic block diagram of the process when the insulating tape 230 is a self-adhesive insulating tape 230 is shown. At this time, step S100 may include sub-step S110: heating the insulating strip 230 at the film outlet end of the insulating strip 230; and, substep S120: the heated insulating tape 230 is wound around the circumferential side of the stranded conductor 210.

Meanwhile, for the self-adhesive type insulating tape 230, the step S200 may also include the sub-step S210: the stranded conductor 210 wound with the insulating tape 230 is cooled by an air cooler, so that the overlapped portions of the insulating tapes 230 are adhered to each other, and the stranded conductor 210 is completely closed.

Fig. 6 shows an illustration of the heating of the insulating tape 230 before it is wound around the stranded conductor 210. In the sub-steps, the insulating tape 230 is heated, and then the heated insulating tape 230 is wrapped around the stranded conductor 210. The self-adhesive type insulating tape 230 is easily attached by heating, and the adhesion between the insulating tape 230 and the stranded conductor 210, the previous turn of the insulating tape 230 wound on the stranded conductor 210 is enhanced.

The manner of heating the insulating tape 230 may be: heating the insulating strip 230 by a hot air blower arranged at the film outlet end; alternatively, the insulating tape 230 passing through the heating ring is heated by the heating ring provided at the film outlet end. Of course, the invention is not limited thereto, and other methods, or other heating devices, etc. may be used to heat the insulating tape 230 in other embodiments of the invention.

The heated self-adhesive insulating tape 230 can be self-adhered to the stranded conductor 210 while being wrapped around the stranded conductor 210, and by cooling in the sub-step S210, the self-adhesive insulating tape 230 can be hermetically fixed to the stranded conductor 210, and the overlapping insulating tapes 230 are adhesively sealed to each other, so that the stranded conductor 210 is completely sealed, the insulating layer 220 is formed, and the quality of the cable 200 is ensured.

In the sub-step S210, the insulating tape 230 and the stranded conductor 210 are cooled by an air cooler, and compared with the cooling by a water tank and the solidification in the prior art, the cooling by the air cooler in the sub-step S210 can simplify the process. The structural form of the air cooler may not be limited, and the air cooler may be installed at two axial sides of the stranded conductor 210 side by side and blows air out relatively; can also be made into a cooling pipe; the insulating tape 230 and the stranded conductor 210 may also be cooled by nitrogen gas; of course, other forms of cooling are possible.

In an alternative embodiment, the insulating tape 230 may be a heat shrinkable insulating tape 230; referring to fig. 7 and 8, in this case, after step S100, step S300 may be further included: the twisted conductor 210 wound with the insulating tape 230 is heated by a hollow heating tube so that the insulating tape 230 is heat-shrunk.

Alternatively, when the heating is performed by a hollow heating tube, the heating temperature may be 70-150 degrees celsius to provide the insulating tape 230 with a good shrinkage rate, for example, the heating temperature by the hollow heating tube is 100 degrees celsius.

Meanwhile, when heating is performed through the hollow heating tube, the twisted conductor 210 wound with the insulation tape 230 may be passed through the hollow heating tube, for example, the twisted conductor 210 may be passed through the hollow heating tube at a constant speed, so that the twisted conductor 210 and the insulation tape 230 wound on the twisted conductor 210 are uniformly heated.

When the insulating tape 230 is a heat-shrinkable insulating tape 230, the step S200 may include the substeps S220 of: the stranded conductor 210 wound with the insulating tape 230 is cooled by an air cooler, so that the overlapping parts of the insulating tapes 230 are shrunk and fastened to completely enclose the stranded conductor 210.

As mentioned above, the cooling by the air cooler in step S220 can simplify the process of the production process compared to the cooling and solidification by the water tank in the prior art. The embodiment of the invention does not limit the structure, the arrangement position and the like of the air cooler, and the air cooler can be arranged side by side and can be used for air outlet relatively and the like.

Referring to fig. 6 and 8, it should be noted that, the type of the insulating tape 230 is different, and the heating time is different, when the insulating tape 230 is a self-adhesive insulating tape 230, as shown in fig. 6, the insulating tape 230 is heated before being wound to increase the viscosity of the insulating tape 230; when the insulating tape 230 is a heat shrinkable insulating tape 230, as shown in fig. 8, the insulating tape 230 is heated after being wound to increase the shrinkage of the insulating tape 230, so that the insulating tape 230 is shrink-sealed on the stranded conductor 210 when cooled.

It should be noted that, for some insulating tapes 230 without self-adhesive property, such as mylar, the insulating layer 220 can be formed simultaneously with the wrapping process by controlling the parameters during the wrapping process. In the manufacturing process according to step S100, parameters such as the overlapping rate, the tension and the pitch of the insulating tape 230 can be adjusted by adjusting the take-up machine and the wrapping machine used for the manufacturing, so that the insulating tape 230 is wrapped on the conductor under the conditions of high overlapping rate, high tension and small pitch. Wherein, pitch and take the lid rate can be adjusted through drawing machine and around the chartered plane jointly, and tension can be adjusted through around the chartered plane.

In the cable manufacturing process described above, the plastic material is extruded without using an extruder, and the insulation tapes 230 are wound around the stranded conductor 210, two adjacent turns of the insulation tapes 230 are overlapped with each other, and then cooled to make the overlapped portions of the insulation tapes 230 completely seal the stranded conductor 210, thereby forming the insulation layer 220. The process has simple steps, and the manufactured insulating layer 220 has thinner thickness, so that the size of the cable 200 is smaller, the wiring of miniaturized equipment is facilitated, and the cable 200 has the characteristics of good bending performance and temperature resistance grade.

Meanwhile, the cable production process according to the embodiment of the present invention can flexibly customize the width, thickness and performance index of the insulating tape 230, thereby meeting different design requirements. For example, the thickness of the insulating tape 230 is less than 0.042 mm, so that the thickness of the insulating layer 220 manufactured by the insulating tape 230 is smaller, which is beneficial to the production of the cable 200 with smaller size and the miniaturization and wiring of the device.

Optionally, additional layers may be further prepared on the insulating tape 230. The additional layer may be a shielding layer for shielding electromagnetic interference. The shielding layer can be prepared by a metal weaving or a longitudinal wrapping and pressing process of a strip material.

Referring to fig. 4, an embodiment of the invention provides a cable 200, where the cable 200 includes a stranded conductor 210 and an insulating layer 220, and the insulating layer 220 is formed on an outer circumferential surface of the stranded conductor 210 by using a cable manufacturing process according to any one of the foregoing embodiments.

Referring to fig. 1 to 8, advantageous effects of the embodiments of the present invention include, for example: the stranded conductor 210 is entirely covered by winding the insulating tape 230 around the periphery of the stranded conductor 210 such that the insulating tape 230 wound around the stranded conductor 210 overlaps each other every turn. And cooling the stranded conductor 210 wound with the insulating tape 230 and the insulating tape 230, sealing the mutually overlapped insulating tapes 230 and fixing the mutually overlapped insulating tapes 230 on the periphery of the stranded conductor 210 to form an insulating layer 220 of the cable 200, thereby completing the production process of the cable 200. Compared with the prior art in which extrusion molding is adopted, the embodiment of the invention has the characteristics of fewer steps and easiness in implementation. And, the structure size of the cable 200 of making is littleer, and dielectric property and temperature resistant grade are higher, and bending property is more superior, is favorable to satisfying the type selection demand that equipment miniaturization internal wiring was walked the line.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A cable production process, comprising:

2. The cable production process according to claim 1, wherein the overlapping rate of the insulating tape wound on the stranded conductor per one turn is 20-60%.

3. The cable production process according to claim 2, wherein the overlap ratio is 50%.

4. The cable production process according to claim 1, wherein the insulating tape is a self-adhesive insulating tape;

heating the insulating strip at the film outlet end of the insulating strip;

5. The cable production process of claim 4, wherein the step of heating the insulating tape at the film exit end of the insulating tape comprises:

6. The cable production process of claim 4, wherein the step of heating the insulating tape at the film exit end of the insulating tape comprises:

7. The cable production process according to claim 1, wherein the insulating tape is a heat-shrinkable insulating tape;

a step after the insulating tape is wound around the periphery of the stranded conductor, further comprising:

8. The cable production process according to claim 7, wherein the heating temperature is 70-150 degrees Celsius when heating by the hollow heating tube.

9. Process for producing a cable according to claim 1, wherein the thickness of the insulating tape is less than 0.042 mm.

10. A cable, comprising: a stranded conductor and an insulation layer;

the insulation layer is formed on the peripheral surface of the stranded conductor by an insulation strip through the process of any one of claims 1 to 9.