CN113744935B - Processing method of cable core, cable core and cable - Google Patents
Processing method of cable core, cable core and cable Download PDFInfo
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- CN113744935B CN113744935B CN202111047837.8A CN202111047837A CN113744935B CN 113744935 B CN113744935 B CN 113744935B CN 202111047837 A CN202111047837 A CN 202111047837A CN 113744935 B CN113744935 B CN 113744935B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
- H01B13/0207—Details; Auxiliary devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- Insulated Conductors (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The application provides a cable core processing method, a cable core and a cable. The processing method of the cable core comprises the steps that standard wires are stranded together by using stranding equipment to form a conductor, and the outer layer pitch of the conductor is 10-12 times of the diameter of the conductor; extruding the semi-conductive shielding layer and the crosslinked polyethylene insulating layer on the outer side of the conductor along the circumferential direction of the conductor in sequence by adopting extrusion molding equipment to form a combined structure of the conductor, the semi-conductive shielding layer and the crosslinked polyethylene insulating layer; extruding the combined structure along the radial direction of the conductor by adopting an extrusion die; and vulcanizing the surface of the combined structure by adopting a vulcanizing pipeline filled with nitrogen to form the cable core. The processing method of the cable core can avoid the processed cable core surface from sinking.
Description
Technical Field
The application relates to the technical field of cables, in particular to a cable core, a processing method of the cable core and a cable.
Background
A cable is an electric power or signal transmission device, and generally includes a cable core located in the middle, and the overall performance of the cable is closely related to the performance of the cable core.
In the related art, a cable core in a cable generally comprises a conductor located in the middle of the cable core and a conductor semi-conductive shielding layer coated outside the conductor, wherein a certain multiple relation exists between the pitch of the conductor and the outer diameter of the conductor, and the number of single wires forming the conductor is also in a certain range.
However, in the above-mentioned cable, due to the structural limitation of the conductor, the internal structure of the conductor is relatively random, and the conductor semiconductive shielding layer is prone to be recessed in the direction close to the conductor, which affects the overall performance of the cable.
Disclosure of Invention
The application provides a cable core processing method, a cable core and a cable, which can avoid the processed cable core from generating depression and improve the use performance of the cable.
The method comprises the steps that standard wires are stranded together by using twisting equipment to form a conductor, and the outer layer pitch of the conductor is 10-12 times of the diameter of the conductor; extruding the semi-conductive shielding layer and the crosslinked polyethylene insulating layer on the outer side of the conductor along the circumferential direction of the conductor in sequence by adopting extrusion molding equipment to form a combined structure of the conductor, the semi-conductive shielding layer and the crosslinked polyethylene insulating layer; extruding the combined structure along the radial direction of the conductor by adopting an extrusion die; and vulcanizing the surface of the combined structure by adopting a vulcanizing pipeline filled with nitrogen to form the cable core.
In a second aspect, the application provides a cable core, which is processed by the processing method of the cable core.
In a third aspect, the application provides a cable, the cross-sectional area of the cable is larger than 300mm2, the withstand voltage of the cable is between 10kV and 35kV, and the cable comprises the cable core.
In the cable core processing method, the cable core and the cable provided by the application, the cable core processing method comprises the steps of twisting standard number of wires together by using twisting equipment to form a conductor, wherein the outer layer pitch of the conductor is 10-12 times of the diameter of the conductor; extruding the semi-conductive shielding layer and the crosslinked polyethylene insulating layer on the outer side of the conductor along the circumferential direction of the conductor in sequence by adopting extrusion molding equipment to form a combined structure of the conductor, the semi-conductive shielding layer and the crosslinked polyethylene insulating layer; extruding the combined structure along the radial direction of the conductor by adopting an extrusion die; and vulcanizing the surface of the combined structure by adopting a vulcanizing pipeline filled with nitrogen to form the cable core. The processing method of the cable core can avoid the processed cable core surface from sinking, so that the cable provided by the application has higher electrical performance.
The construction of the present application and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a cable core processing method according to an embodiment of the present application;
fig. 2a is a schematic structural diagram of an extrusion die in a processing method of a cable core provided in the embodiment of the present application;
figure 2b is a cross-sectional view of an extrusion die in a method of processing a cable core according to an embodiment of the present application;
fig. 3 is a flowchart of a step of twisting standard numbers of wires together to form a conductor by using a twisting device in a processing method of a cable core provided in an embodiment of the present application.
Description of reference numerals:
1-extruding a die;
11-a mold core;
12-head end;
13-terminal;
d-head end outer diameter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
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 application. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that, in the description of the present application, the terms "first" and "second" are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In the related technology, a cable core in a cable generally comprises a conductor positioned in the middle of the cable core and a semi-conductive shielding layer coated on the outer side of the conductor, the outer layer pitch of the conventional conductor structure is 10-13 times of the outer diameter of the conductor at present, the outer layer of the conductor after twisting can be loose and have gaps due to the influence of tension, linear speed and pitch on the conductor in the production process, the conventional conductor design structure can not completely avoid the production condition of the sinking of the semi-conductive shielding layer due to the relation of the outer layer compression amount and the design outer diameter of the conductor, and the phenomenon of the unsmooth interface of the semi-conductive shielding layer can be caused when the semi-conductive shielding layer is extruded; in addition, the sunken cable can cause positive and negative charges to be continuously intensified on the sunken point in the operation process, so that the service life of the cable is accelerated to be reduced, and the breakdown event can be caused in the long-term overload operation process.
Therefore, in order to avoid the surface of the cable core from being recessed, and to enable the cable to have a longer service life, the embodiment of the application provides a processing method of the cable core, the cable core and the cable, in the processing method of the cable core, the cable core with a smooth surface is processed by enabling the outer pitch of the conductor and the diameter of the conductor to be in a preset proportional relation and limiting the structure of the extrusion die, and the service life of the cable is prolonged by avoiding the surface of the cable core from being recessed.
The outer pitch of the conductor refers to a helical pitch formed by twisting the conductor, and the outer pitch of the conductor will not be explained in the following description.
The processing method of the cable core and the cable provided by the embodiment are described in detail below with reference to the accompanying drawings and the detailed description.
This embodiment provides a cable having a cross-sectional area greater than 300mm 2 And the bearing voltage of the cable is between 10 to 35kV, the cable comprises a cable core, the cable provided by the embodiment can further comprise an armor layer and an optical fiber unit, the armor layer is coated outside the cable core, the optical fiber unit is arranged in the armor layer or in a gap formed between the cable core and the armor layer, and the specific structures and types of the armor layer and the optical fiber unit are not limited.
It should be noted that, in the cable provided in this embodiment, the number of the cable cores may be one or more, and here, the number of the cable cores is not particularly limited.
In order to prolong the service life of the cable provided by this embodiment and avoid the surface of the cable core from being recessed, this embodiment further provides a cable core and a processing method of the cable core, and the processing method of the cable core provided by this embodiment is described in detail below, and the cable core provided by this embodiment is processed by the processing method of the cable core described below.
Fig. 1 is a flowchart of steps of a cable core processing method provided in an embodiment of the present application.
As shown in fig. 1, the processing method of the cable core provided in this embodiment includes:
s101, twisting standard-number wires together by using twisting equipment to form a conductor, wherein the outer layer pitch of the conductor is 10-12 times of the diameter of the conductor.
The standard number is 300mm in cross section 2 And the number of the conductors in the cable with the bearing voltage of 10-35 kV is the general number adopted in the production process, and specifically, the standard number is 31 or 61.
Specifically, the twisting device may include a branching unit, a twisting unit, and the like, and the specific structure of the twisting device is not limited, the conductor produced by the above method is a pressing structure, and the shape and pressing effect of the twisted conductor are more stable, so that the pressing force generated from the outer layer of the conductor to the inner layer of the conductor can be increased, and the conductor in the conductor is not easy to loosen and rebound; meanwhile, the outer diameter of the outer layer of the conductor can be reduced under the condition of meeting the direct current resistance of the conductor.
In some alternative embodiments, the conductive wire may be a copper conductive wire or other types of metal conductive wires, and the other types of metal conductive wires are not particularly limited.
In order to improve the mechanical properties of the wire and satisfy the electrical requirements of the wire, in a specific embodiment of this embodiment, the elongation of the wire is between 30% and 35%, and the resistivity of the wire is 0.0171 Ω · m or less 2 And the diameter of the lead is required to be within a positive tolerance range of the process requirement, so that the influence of the reduction of the outer diameter on the direct current resistance of the conductor is ensured while the outer layer compression amount of the conductor is increased, and the direct current resistance of the conductor is ensured to be qualified.
The elongation of the wire refers to the percentage of the ratio of the elongation of the original gauge length to the original gauge length after the wire is subjected to tensile fracture; the resistivity of the wire is used to represent the resistance characteristic of the wire, and specifically, in the present embodiment, the resistance of the conductor having a length of 1 meter and a cross-sectional area of 1 square meter is 0.0171 Ω.
In some embodiments, in order to reduce the outer diameter of the conductor, the die used to twist the outer conductor may be replaced in the twisting apparatus so that the dc resistance of the conductor meets the standard requirements.
S102, sequentially extruding the semi-conductive shielding layer and the crosslinked polyethylene insulating layer on the outer side of the conductor along the circumferential direction of the conductor by adopting extrusion equipment to form a combined structure of the conductor, the semi-conductive shielding layer and the crosslinked polyethylene insulating layer.
In a specific embodiment of this embodiment, the tensile strength of the semiconductive shielding layer is 15MPa or more, the elongation at break of the semiconductive shielding layer is 200% or more, the maximum load elongation of the semiconductive shielding layer is 80% or less, and the compression set of the semiconductive shielding layer is 10% or less.
It should be noted that the tensile strength is a critical value of transition of the semiconductive shielding layer from uniform plastic deformation to local concentrated plastic deformation, and is also the maximum bearing capacity of the semiconductive shielding layer under a static tension condition; the elongation at break refers to the ratio of the elongation length before and after stretching to the length before stretching when the fiber is pulled apart under the action of external force; the above-mentioned compression set refers to the relationship between the elasticity and the recovery degree of the semiconductive shield layer.
And S103, extruding the combined structure along the radial direction of the conductor by using an extrusion die.
Fig. 2a is a schematic structural diagram of an extrusion die in a processing method of a cable core provided in the embodiment of the present application. Fig. 2b is a cross-sectional view of an extrusion die in the processing method of the cable core provided by the embodiment of the application.
As shown in fig. 2a and 2b, the extrusion die 1 has a die core 11 through which the combined structure passes, the extrusion die 1 has a head end 12 and a tail end 13, the combined structure enters the die core 11 from the head end 12 and extends out of the die core 11 from the tail end 13; in order to ensure that the surface of the cable core is smoother, in some alternative embodiments, when the carrying voltage of the cable is 10kV, the head end outer diameter d of the extrusion die 1 is 0.2 to 0.4mm larger than the outer diameter of the composite structure, that is, the head end outer diameter d of the extrusion die 1 is 0.2 to 0.4mm larger than the sum of the outer diameter of the conductor and the thickness of twice the thickness of the semiconductive shielding layer; in other optional embodiments, when the carrying voltage of the cable is 35kV, the head end outer diameter d of the extrusion die 1 is 0.3 to 0.5mm larger than the outer diameter of the composite structure, that is, the head end outer diameter d of the extrusion die 1 is 0.3 to 0.5mm larger than the sum of the outer diameter of the conductor and the thickness of twice the semiconductive shielding layer, so that the head end outer diameter d can be increased by 0.2 to 0.5mm compared with the outer diameter in the related art, and the extrusion pressure of the extrusion die 1 can be reduced to ensure the smoothness of the cable core surface.
In a specific embodiment of this embodiment the head end outer diameter d of the extrusion die 1 is 0.3mm larger than the outer diameter of the composite structure, i.e. the head end outer diameter d of the extrusion die 1 is 0.3mm larger than the sum of the outer diameter of the conductor and twice the thickness of the semiconducting shield layer.
And S104, vulcanizing the surface of the combined structure by adopting a vulcanizing pipeline filled with nitrogen to form the cable core.
In order to make the nitrogen pressure in the vulcanizing pipeline lower under the condition that the thermal extension of the semiconductive shielding layer is qualified, in a specific mode of this embodiment, the nitrogen pressure in the vulcanizing pipeline varies with the difference of the carrying voltage of the cable core, further, when the withstand voltage of the cable provided by the above embodiment is 10kV, the nitrogen pressure in the vulcanizing pipeline is between 6 kg and 8kg, and when the withstand voltage of the cable provided by the above embodiment is 35kV, the nitrogen pressure in the vulcanizing pipeline is between 8kg and 9 kg.
In order to avoid the end structure of the conductor from being loose, in this embodiment, after twisting a plurality of wires together by using a twisting device to form the conductor, before sequentially extruding the semiconductive shielding layer and the crosslinked polyethylene insulating layer outside the conductor along the circumferential direction thereof by using an extrusion molding device, the method further includes the step of crimping both ends of the conductor along the length direction of the conductor itself by using a circular rolling die. Therefore, the conductor structure at the end part of the conductor can be prevented from being loosened, so that the compactness in the conductor is stronger, and the overall performance of the conductor is improved.
Fig. 3 is a flowchart of steps of twisting standard numbers of conducting wires together to form a conductor by using twisting equipment in a processing method of a cable core provided by an embodiment of the application.
As shown in fig. 3, in order to avoid the situation that the twisting quality of the conductor is affected by uneven tension, wire skipping and too large gap occur, in this embodiment, a twisting device is used to twist together the standard number of wires to form the conductor, which specifically includes:
s201, adjusting the paying-off tension of a plurality of stranding cages in the stranding equipment so that the paying-off tension at the same position of each stranding cage is equal.
In some alternative embodiments, the stranding device may include 630 pan stranding cages, where the number of stranding cages included in the stranding device is not particularly limited.
And S202, twisting a plurality of wires together by adopting a twisting cage after the paying-off tension is adjusted to form a conductor.
Therefore, the paying-off tension of the stranding cage can be adjusted in the stranding process of the conductor, so that the stranding quality of the conductor is ensured, and the internal structure of the stranding cage is more compact.
In order to more clearly illustrate the parameters used in the process of manufacturing the cable core by using the cable core processing method provided by this embodiment, the following table is listed, as shown in table 1, where table 1 is a table for selecting the parameters of the cable core processing method provided by this embodiment.
Table 1 parameter selection table using the processing method of cable core provided in this embodiment
The processing method of the cable core provided by the embodiment comprises the steps of twisting standard number of wires together by using twisting equipment to form a conductor, wherein the outer layer pitch of the conductor is 10-12 times of the diameter of the conductor; extruding the semi-conductive shielding layer and the crosslinked polyethylene insulating layer on the outer side of the conductor along the circumferential direction of the conductor in sequence by adopting extrusion molding equipment to form a combined structure of the conductor, the semi-conductive shielding layer and the crosslinked polyethylene insulating layer; extruding the combined structure along the radial direction of the conductor by adopting an extrusion die; and vulcanizing the surface of the combined structure by adopting a vulcanizing pipeline filled with nitrogen to form the cable core. The processing method of the cable core provided by the embodiment can avoid the processed surface of the cable core from being sunken, so that the cable provided by the embodiment has high electrical performance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. A processing method of a cable core is characterized by comprising the following steps:
twisting standard number of wires together by using twisting equipment to form a conductor, wherein the outer layer pitch of the conductor is 10-12 times of the diameter of the conductor; the method for twisting the standard number of wires together to form the conductor by adopting twisting equipment specifically comprises the following steps: adjusting the payout tension of a plurality of stranding cages in the stranding apparatus such that the payout tension is equal at the same location of each stranding cage; twisting a plurality of wires together by adopting the twisting cage after the paying-off tension is adjusted so as to form the conductor; the elongation of the wire is between 30% and 35%, and the resistivity of the wire is less than or equal to 0.0171 omega m 2 /m；
Sequentially extruding a semi-conductive shielding layer and a crosslinked polyethylene insulating layer from the outer side of the conductor along the circumferential direction of the conductor by adopting extrusion equipment to form a combined structure of the conductor, the semi-conductive shielding layer and the crosslinked polyethylene insulating layer; the tensile strength of the semi-conductive shielding layer is more than or equal to 15MPa, the elongation at break of the semi-conductive shielding layer is more than or equal to 200%, the maximum load elongation of the semi-conductive shielding layer is less than or equal to 80%, and the compression permanent deformation of the semi-conductive shielding layer is less than or equal to 10%;
extruding the composite structure along the radial direction of the conductor by adopting an extrusion die; the extrusion die has a die core through which the composite structure passes, the extrusion die has a head end and a tail end, the composite structure enters the die core from the head end and extends out of the die core from the tail end; the outer diameter of the head end of the extrusion die is 0.2-0.4 mm larger than the outer diameter of the combined structure, or the outer diameter of the head end of the extrusion die is 0.3-0.5 mm larger than the outer diameter of the combined structure;
and vulcanizing the surface of the combined structure by adopting a vulcanizing pipeline filled with nitrogen to form the cable core.
2. The processing method of the cable core according to claim 1, wherein after the twisting a plurality of wires together to form the conductor by using the twisting device, before the sequentially extruding the semiconductive shielding layer and the crosslinked polyethylene insulating layer outside the conductor along the circumferential direction thereof by using the extruding device, the method further comprises:
and adopting a circular rolling die to crimp the two ends of the conductor along the length direction of the conductor.
3. The processing method of the cable core according to claim 1 or 2, wherein the pressure of the nitrogen gas in the vulcanizing pipeline is changed correspondingly according to the different carrying voltages of the cable core.
4. The processing method of the cable core according to claim 1 or 2, wherein the standard number is 31 or 61.
5. A cable core, which is characterized in that the cable core is processed by the processing method of the cable core as recited in any one of claims 1 to 4.
6. A cable, characterized in that the cross-sectional area of the cable is larger than 300mm 2 And the bearing voltage of the cable is between 10 and 35kV, and the cable comprises the rightThe cable core of claim 5.
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| CN202111047837.8A CN113744935B (en) | 2021-09-08 | 2021-09-08 | Processing method of cable core, cable core and cable |
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| CN113744935B true CN113744935B (en) | 2022-08-12 |
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| CN112117024A (en) * | 2020-09-02 | 2020-12-22 | 江苏亨通电力电缆有限公司 | Lightweight corrosion-resistant energy-saving aluminum conductor, preparation method thereof and medium-voltage power cable |
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| CN103600481A (en) * | 2013-11-29 | 2014-02-26 | 白银有色集团股份有限公司 | Extrusion-type mold and method for preparing special-shaped conductor cable by extrusion-type mold |
| CN204451143U (en) * | 2014-12-20 | 2015-07-08 | 天津安讯达科技有限公司 | A kind of tubular molding tool for large external diameter cable cover(ing) |
| CN206272207U (en) * | 2016-11-30 | 2017-06-20 | 宜昌信通电缆有限公司 | A kind of DC ultra-high-voltage crosslinked cable connecting hose |
| JP7131892B2 (en) * | 2017-07-20 | 2022-09-06 | 矢崎総業株式会社 | Highly flexible insulated wire |
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| CN112117024A (en) * | 2020-09-02 | 2020-12-22 | 江苏亨通电力电缆有限公司 | Lightweight corrosion-resistant energy-saving aluminum conductor, preparation method thereof and medium-voltage power cable |
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