CN105845263B - Computer transmission cable and preparation method thereof - Google Patents

Abstract

The invention discloses a novel computer transmission cable and a preparation method thereof. The novel computer transmission cable comprises a cable inner core, an isolation layer, a first shielding layer and Sheath layer; each of the cable inner cores is formed by twisting a plurality of inner core units, and the inner core unit includes two mutually twisted insulated core wires, and is coated on the two insulated core wires The outer second shielding layer; the first shielding layer and the second shielding layer are braided by first copper wires, and the braiding density of the first copper wires is greater than 80%; the insulated core wire includes a conductor and an insulating layer covering the conductor, the conductor is formed by twisting a plurality of second copper wires with a single wire diameter less than 0.18mm. The beneficial effect of the present invention is that the double shielding mode of separate shielding and general shielding is adopted for the insulating core wire, which can further increase the transmission speed of the cable and reduce the dielectric loss and attenuation of the cable.

Description

Computer transmission cable and its preparation method

technical field

The invention relates to the technical field of power cables, and more specifically, relates to a novel computer transmission cable and a preparation method thereof.

Background technique

With the popularity and application of computers and computer network systems in recent years, the performance requirements for computer cables are also getting higher and higher. However, conventional computer cables have slow transmission rate, large dielectric loss, and large attenuation, which can no longer meet the market's demand for computer cables. Therefore, it is urgent to develop a new type of computer cable to meet the needs of the market, which is the development trend of computer cables. The present invention provides a new type of computer cable to meet market demand.

Contents of the invention

The technical problem to be solved by the present invention is to provide a new type of computer transmission cable and its preparation method for the above-mentioned defects in the prior art.

The technical solution adopted by the present invention to solve its technical problems is:

A new type of computer transmission cable is provided, which includes a cable inner core, and an isolation layer, a first shielding layer and a sheath layer that are sequentially coated on the outside of the cable inner core from the inside to the outside; the cable inner core is composed of a plurality of inner The core unit is twisted, each of the inner core units includes two mutually twisted insulated core wires, and a second shielding layer wrapped outside the two insulated core wires; the first shielding layer Both the first copper wire and the second shielding layer are braided by the first copper wire, and the braiding density of the first copper wire is greater than 80%; the insulated core wire includes a conductor and an insulating layer wrapped outside the conductor, so The conductor is formed by twisting a plurality of second copper wires with a single wire diameter less than 0.18mm.

In the novel computer transmission cable of the present invention, the first copper wire is a tinned copper wire, and the diameter of the tinned copper wire is 0.08-0.15 mm.

In the novel computer transmission cable of the present invention, the thickness of the first shielding layer is greater than or equal to 0.08mm, and the thickness of the second shielding layer is greater than or equal to 0.05mm.

In the novel computer transmission cable of the present invention, the insulating layer is formed by foaming and extruding LDPE material, and the thickness of the insulating layer is 0.3mm-0.8mm.

In the novel computer transmission cable according to the present invention, there is a filling layer at the twisted gap between the two insulated core wires, so that the inner core unit forms a round structure, and the filling layer is made of flexible polyester-cotton fiber rope Or flexible stiffeners twisted to form.

In the novel computer transmission cable of the present invention, the inner core of the cable is formed by twisting a plurality of inner core units in a concentric twisting manner.

In the novel computer transmission cable of the present invention, the isolation layer is formed by wrapping polyester tape, and the thickness of the isolation layer is 0.03mm-0.08mm.

In the novel computer transmission cable described in the present invention, the sheath layer is made of a halogen-free low-smoke flame-retardant polyolefin composite material, and the halogen-free low-smoke flame-retardant polyolefin composite material includes: EVA30 ～50 parts, 150～180 parts of Mg(OH) ₂ or Al(OH) ₃ , 35～50 parts of LDPE, 5～20 parts of compatibilizer, 2～4 parts of synergist and 0.5～1 part of stabilizer.

The present invention also provides a new type of computer transmission cable, which includes a cable inner core, and an isolation layer, a first shielding layer and a sheath layer that are sequentially coated on the outside of the cable inner core from the inside to the outside; the cable inner core is composed of The seven inner core units are concentrically twisted into a round structure, and each of the inner core units includes two mutually twisted insulated core wires, and a second insulated core wire wrapped outside the two insulated core wires. Two shielding layers; there is a filling layer at the twisted gap between the two insulated core wires, so that the inner core unit forms a round structure;

Both the first shielding layer and the second shielding layer are braided by first copper wires, and the braiding density of the first copper wires is greater than 80%; the insulated core wire includes a conductor and is covered on the conductor The outer insulating layer, the conductor is formed by twisting a plurality of second copper wires with a single wire diameter less than 0.18mm.

The present invention also provides a preparation method of a novel computer transmission cable, comprising the following steps:

S1. Preparing the conductor: drawing and twisting the conductor material to obtain the conductor;

S2. Extruding the insulating layer: using an extrusion die to coat the insulating layer made of LDPE material on the outside of the conductor to obtain an insulating core wire;

S3. Prepare the inner core unit: twist the two insulated core wires, and arrange a second shielding layer outside the two insulated core wires to obtain the inner core unit;

S4. Prepare the inner core of the cable: twist a plurality of the inner core units in a concentric twisting manner to obtain the inner core of the cable;

S5. Wrapping isolation layer: evenly wrap the isolation layer outside the inner core of the cable, and the isolation layer is formed by wrapping polyester tape;

S6. Setting the first shielding layer: evenly wrapping the first shielding layer formed by braiding tinned copper wires on the outside of the isolation layer;

S7. Extruding the sheath layer: uniformly covering the first shielding layer with a sheath layer made of halogen-free low-smoke flame-retardant polyolefin composite material by means of extrusion.

In summary, implementing the novel computer transmission cable of the present invention and its preparation method has the following beneficial effects: firstly, the insulating core wire is covered with the second shielding layer to realize the separate shielding of the insulating core wire; Cover the first shielding layer to realize the overall shielding of the insulated core wire. By adopting the double shielding method of individual shielding and total shielding, the transmission speed of the cable can be further increased, and the dielectric loss and attenuation of the cable can be reduced. Secondly, the insulating layer made of LDPE material can increase the transmission speed of the cable and reduce the dielectric loss and attenuation. At the same time, the LDPE material greatly improves the aging resistance of the cable, improves the tensile strength of the cable, and enhances the cable The overall flexibility enables the insulating layer to better protect the second copper wire, avoiding damage to the insulation of the cable due to abrasion of the insulating layer and causing potential safety hazards. Third, the conductor is made of multiple thin soft copper wires twisted, the copper wire has a high single wire elongation and a small diameter, so that the number of copper wires required to make a conductor with the same outer diameter is much larger than that of existing The amount of thick copper wire used in the technology can effectively and evenly disperse the external force suffered by the cable, so that the conductor of the present invention has strong electrical conductivity, no hydrogen embrittlement phenomenon is not easy to break, and has extremely strong bending resistance. It will not break after more than millions of back-and-forth bending movements, ensuring that the physical and electrical performance of the cable is not affected. Finally, the sheath layer is made of halogen-free low-smoke flame-retardant polyolefin composite material, which not only meets environmental requirements and general flame-retardant performance, but also has certain waterproof performance, which can effectively prevent water from radially penetrating into the cable, thereby prolonging the cable life. The service life of drag chain cables.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a schematic structural diagram of a new type of computer transmission cable provided by one of the preferred embodiments of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, the novel computer transmission cable provided by the preferred embodiment of the present invention includes a cable inner core 4, and an isolation layer 3 and a first shielding layer that are sequentially coated outside the cable inner core 4 from the inside to the outside. 2 and jacket layer 1. Among them, the cable inner core 4 is formed by twisting a plurality of inner core units 40, and the inner core unit 40 includes two mutually twisted insulated core wires 6, and a second shielding layer wrapped outside the two insulated core wires 6 5. The first shielding layer 2 and the second shielding layer 5 are braided by first copper wires, and the braiding density of the first copper wires is greater than 80%. Further, the insulated core wire 6 includes a conductor 8 and an insulating layer 9 covering the conductor 8, and the conductor 8 is formed by twisting a plurality of second copper wires with a single wire diameter less than 0.18 mm.

In this embodiment, the conductor 8 is twisted by a plurality of second copper wire bundles, and the second copper wire is soft annealed oxygen-free copper wire, because the annealed oxygen-free copper wire does not contain oxygen and does not contain any deoxidizer residue Pure copper, so its electrical and mechanical properties are extremely good, and the monofilament elongation of oxygen-free copper wire exceeds 20%. The high monofilament elongation indicates that the copper wire is soft, ductile, and has strong bending resistance.

Different from thick copper wires in the prior art, the single wire diameter of the second copper wire used in the present invention is less than 0.2mm; preferably, the single wire diameter of the second copper wire is less than 0.18mm; in this embodiment, the second The monofilament diameter of the copper wire is 0.16mm. Because the monofilament diameter of the second copper wire among the present invention is little, the quantity that makes the required second copper wire of the conductor 8 of same outer diameter is far greater than the quantity of the thick copper wire that needs to use in the prior art, can effectively like this Evenly disperse the external force on the cable. Therefore, the conductor 8 of the present invention has strong electrical conductivity, no hydrogen embrittlement, is not easy to break, has a strong bending resistance, and will not fracture, thereby ensuring that the physical and electrical performance of the cable is not affected.

In addition, the plurality of second copper wires mentioned above are bundled into a conductor 8 by armor stranding, and the stranding gaps are filled with flexible high-grade polyester-cotton fiber filaments. Wherein, in order to ensure that the prepared conductor 8 has stronger strength and bending ability, the bundle twist pitch of the second copper wire is less than or equal to 10 times of the twisted outer diameter of the second copper wire when twisted, and The stranding direction of the plurality of second copper wires is leftward.

Further, in this embodiment, an extrusion die is used to cover the conductor 8 with an insulating layer 9 made of LDPE material, so as to obtain the insulated core wire 6 . Since the LDPE material has the advantages of low density and good insulation, the insulating layer 9 made of this LDPE material can increase the transmission speed of the cable and reduce the dielectric loss and attenuation. At the same time, this LDPE material greatly improves the aging resistance of the cable, improves the tensile strength of the cable, and enhances the overall flexibility of the cable, so that the insulating layer 9 can better protect the second copper wire and avoid damage caused by the insulating layer. 9 Abrasion and damage to the insulation of the cable, causing a safety hazard.

Preferably, the thickness of the insulating layer 9 of the present application is 0.3 mm to 0.8 mm. Since the insulating layer 9 made of LDPE material has strong flexibility and wear resistance, the thickness of the traditional polyvinyl chloride insulating layer needs to reach this In order to have the same protective effect as the insulating layer 9 of the present application, the thickness of the insulating layer 9 is more than double that of the application. In this embodiment, the thickness of the insulating layer 9 is 0.5mm.

Further, the two insulated core wires 6 are twisted in a armor-like twisting manner, and a second shielding layer 5 is provided outside the two insulated core wires 6 to obtain an inner core unit 40 .

Preferably, the twisting directions of the two insulated core wires 6 are "S"-"Z"-"S" from the outer layer to the inside, and the twisting pitch of the insulated core wires 6 is less than or equal to that of the insulated core wires 6 10 times the outside diameter of the strand.

Preferably, a flexible high-grade polyester-cotton fiber rope or a flexible reinforcing rib (not labeled on the figure) can be added in the twisted space between the two insulating core wires 6 . The flexible reinforcing rib is made of metal material or non-metallic material with low electrical conductivity. By adding flexible reinforcing ribs in the twisted gap, it can not only protect the insulating core wire 6, but also prevent the insulating core wire 6 from being damaged and damage the cable. Insulation, and can enhance the ductility and bending resistance of the entire cable. In addition, by adding flexible high-grade polyester-cotton fiber ropes or flexible reinforcing ribs in the twisted gap, adaptive adjustments can be made according to different requirements of the system, so that the insulated core wire 6 forms a round structure, thereby maintaining the overall structure of the cable unchanged , this adaptive adjustment is simple and easy and greatly enhances the adaptability and application range of the cable.

Preferably, the second shielding layer 5 is evenly wrapped around the two insulated core wires 6 , wherein the second shielding layer 5 is braided by the first copper wire. In this embodiment, the first copper wire is a tinned copper wire, the diameter of the tinned copper wire is 0.08-0.15 mm, and the braiding density of the tinned copper wire is greater than 80%, so as to better protect the insulating core wire 6. Damaged, improve the service life of the cable. At the same time, covering the insulating core wire 6 with the second shielding layer 5 can increase the transmission speed of the cable and reduce the dielectric loss and attenuation of the cable.

Further, the cable inner core 4 is obtained by twisting a plurality of inner core units 40 in a armor-like twisting manner. Wherein, the twisting direction of the inner core unit 40 is from the outer layer to the inside in order of "S"-"Z"-"S" and so on, and the twisting pitch of the inner core unit 40 is less than or equal to the twisting pitch of the inner core unit 40. 15 times the outer diameter.

Preferably, it is also possible to add flexible high-grade polyester-cotton fiber ropes or flexible reinforcing ribs (not labeled on the figure) in the twisted spaces between multiple inner core units 40 to avoid damage to the inner core unit 40 and damage the insulation of the cable. Thereby enhancing the ductility and bending resistance of the entire cable.

Preferably, by adding flexible high-grade polyester-cotton fiber ropes or flexible reinforcing ribs in the stranded space, the cable inner core 4 forms a rounded structure, thereby maintaining the overall structure of the cable unchanged. This adaptive adjustment is simple and easy. Greatly enhance the adaptability and scope of application of the cable. In this embodiment, the number of inner core units 40 is seven, and flexible high-grade polyester-cotton fiber ropes or flexible reinforcing ribs are added to the stranding spaces of the seven inner core units 40, so that the cable inner core 4 forms a rounded structure. It can be understood that the present embodiment does not limit the specific number of inner core units 40 , which may be multiple; preferably, the number of inner core units 40 is four or seven.

Further, the outer circumference of the cable inner core 4 is covered with an isolation layer 3, which is formed by wrapping a polyester tape. Because the polyester tape has high mechanical strength, excellent insulation performance, and can withstand high temperature and Low temperature resistance, so wrapping a layer of polyester tape around the cable inner core 4 can play a role in fixing the cable inner core 4, thereby ensuring the stability of the mechanical and electrical properties of the cable. In this embodiment, the thickness of the isolation layer 3 is 0.03mm˜0.08mm; preferably, the thickness of the isolation layer 3 is 0.055mm.

Further, the outer peripheral surface of the isolation layer 3 is evenly covered with the first shielding layer 2, so as to increase the transmission speed of the cable and reduce the dielectric loss and attenuation of the cable. Wherein, the first shielding layer 2 is braided by first copper wires, the first copper wires are also tinned copper wires, the diameter of the tinned copper wires is 0.08-0.15 mm, and the braiding density of the tinned copper wires is greater than 80 %, to better protect the isolation layer 3 from damage and increase the service life of the cable. In this embodiment, the thickness of the first isolation layer 2 is 0.03mm˜0.08mm; preferably, the thickness of the first shielding layer 2 is 0.055mm.

In this embodiment, the insulating core wire 6 is coated with the second shielding layer 5 to realize the individual shielding of the insulating core wire 6, while the isolation layer 3 is coated with the first shielding layer 2 to realize the overall shielding of the insulating core wire 6 , By adopting the double shielding method of separate shielding and total shielding, the transmission speed of the cable can be further increased, and the dielectric loss and attenuation of the cable can be reduced.

Further, the first shielding layer 2 is evenly covered with a sheath layer 1. In this embodiment, the sheath layer 1 is made of a halogen-free low-smoke flame-retardant polyolefin composite material to meet environmental protection requirements and meet the flame retardancy of the cable. and water resistance. Among them, the halogen-free low-smoke flame-retardant polyolefin composite material is made of the following raw materials in parts by weight: 30-50 parts of EVA, 150-180 parts of Mg(OH) ₂ or Al(OH) ₃ , 35-50 parts of LDPE, 5-20 parts of compatibilizer, 2-4 parts of synergist and 0.5-1 part of stabilizer.

Different from traditional flame-retardant materials, this halogen-free low-smoke flame-retardant polyolefin composite material can not only meet the general flame-retardant performance of cables, but also has certain waterproof performance, which can effectively prevent water from radially penetrating into the cable. In addition, this halogen-free low-smoke flame-retardant polyolefin composite material greatly improves the aging resistance of the cable, improves the tensile strength, and enhances the overall flexibility of the cable, so that the first shielding layer 2 can be better Increase the transmission speed of the cable and reduce the dielectric loss and attenuation of the cable. At the same time, the sheath layer 1 made of this halogen-free low-smoke flame-retardant polyolefin composite material can better protect the insulated core wire 6, and avoid damage to the insulation of the cable due to the abrasion of the sheath layer 1, thereby causing potential safety hazards .

In this embodiment, the thickness of the sheath layer 1 is 0.6 mm to 1 mm. Since the sheath layer 1 made of halogen-free low-smoke flame-retardant polyolefin composite material has strong flexibility and wear resistance, the traditional poly The thickness of the vinyl chloride sheath layer needs to be more than twice the thickness of the sheath layer 1 described in the present application in order to have the same protective effect as the sheath layer 1 of the present application. Preferably, the thickness of the sheath layer 1 is 0.8 mm.

The present application also provides a new type of computer transmission cable, which includes a cable inner core 4 , and an isolation layer 3 , a first shielding layer 2 and a sheath layer 1 coated on the cable inner core 4 sequentially from inside to outside. Wherein, the cable inner core 4 is twisted into a round structure by seven inner core units 40 in a concentric twisting manner. The second shielding layer 5 outside the core wire 6 has a filling layer 7 at the twisted gap between the two insulated core wires 6 so that the inner core unit 40 forms a round structure.

Further, the first shielding layer 2 and the second shielding layer 5 are braided by first copper wires, and the braiding density of the first copper wires is greater than 80%; In layer 9, the conductor 8 is formed by twisting a plurality of second copper wires with a single wire diameter less than 0.18mm.

Preferably, the first copper wire is a tinned copper wire, the diameter of the tinned copper wire is 0.08-0.15 mm, and the braiding density of the tinned copper wire is greater than 80%, so as to better protect the insulating core wire 6 from damage , improve the service life of the cable.

In this embodiment, the insulating core wire 6 is coated with the second shielding layer 5 to realize the individual shielding of the insulating core wire 6, while the isolation layer 3 is coated with the first shielding layer 2 to realize the overall shielding of the insulating core wire 6 , By adopting the double shielding method of separate shielding and total shielding, the transmission speed of the cable can be further increased, and the dielectric loss and attenuation of the cable can be reduced.

The present application also provides a method for preparing a new type of computer transmission cable. Since the process control conditions in the cable preparation process are prior art, details will not be repeated here. Wherein, the preparation method comprises the following steps:

S1. Preparing the conductor: drawing and twisting the conductor material to obtain the conductor 8 .

Specifically, the preparation of the conductor 8 includes three sub-steps: material selection, wire drawing and stranding. Material selection: Select the conductor material used according to the requirements of preparing different cables, such as choosing an electrical round copper rod as the conductor material; wire drawing: draw and anneal the conductor material to obtain annealed oxygen-free copper wire, the diameter of the annealed oxygen-free copper wire 0.15 mm; Stranding: the annealed oxygen-free copper wire obtained by wire drawing is bundled into a conductor 8 by armor stranding.

S2. Extruded insulation layer: the conductor 8 is coated with an insulation layer 9 made of LDPE material by using an extrusion mold to obtain an insulated core wire 6 .

S3. Prepare the inner core unit: twist the two insulated core wires 6 , and arrange the second shielding layer 5 outside the two insulated core wires 6 to obtain the inner core unit 40 .

S4. Prepare the cable inner core: twist a plurality of inner core units 40 in a concentric twisting manner to obtain the cable inner core 4 .

S5. Wrapping isolation layer: evenly wrap the isolation layer 3 on the outside of the cable inner core 4, and the isolation layer 3 is formed by wrapping the polyester tape.

S6. Setting the first shielding layer: uniformly covering the first shielding layer 2 formed by braiding tinned copper wires on the outside of the isolation layer 3 .

S7. Extruded sheath layer: the sheath layer 1 made of halogen-free low-smoke flame-retardant polyolefin composite material is evenly coated on the outside of the first shielding layer 2 by extrusion; specifically, the configuration includes the no-halogen Raw material for halogen low smoke flame retardant polyolefin composites.

Example 1

S1. Prepare the conductor: draw and twist the conductor material to obtain the conductor 8;

S2. Extruding the insulating layer: using an extrusion mold to coat the insulating layer 9 made of LDPE material on the outside of the conductor 8, so as to obtain the insulating core wire 6;

S3. Prepare the inner core unit: twist the two insulated core wires 6, and set the second shielding layer 5 outside the two insulated core wires 6 to obtain the inner core unit 40;

S4. Prepare the cable inner core: twist a plurality of inner core units 40 in a concentric twisting manner to obtain the cable inner core 4;

S5. Wrapping isolation layer: evenly wrap the isolation layer 3 on the outside of the cable inner core 4, and the isolation layer 3 is wrapped by polyester tape;

S6. Setting the first shielding layer: evenly covering the first shielding layer 2 formed by braiding tinned copper wires on the outside of the isolation layer 3;

S7. Extruding the sheath layer: uniformly covering the sheath layer 1 made of halogen-free low-smoke flame-retardant polyolefin composite material on the outside of the first shielding layer 2 by extrusion;

Among them, 30 parts of EVA, 180 parts of Al(OH) ₃ , 50 parts of LDPE, 20 parts of compatibilizer, 2 parts of synergist and 1 part of stabilizer.

Example 2

S1. Prepare the conductor: draw and twist the conductor material to obtain the conductor 8;

S2. Extruding the insulating layer: using an extrusion mold to coat the insulating layer 9 made of LDPE material on the outside of the conductor 8, so as to obtain the insulating core wire 6;

S3. Prepare the inner core unit: twist the two insulated core wires 6, and set the second shielding layer 5 outside the two insulated core wires 6 to obtain the inner core unit 40;

S4. Prepare the cable inner core: twist a plurality of inner core units 40 in a concentric twisting manner to obtain the cable inner core 4;

S5. Wrapping isolation layer: evenly wrap the isolation layer 3 on the outside of the cable inner core 4, and the isolation layer 3 is wrapped by polyester tape;

S6. Setting the first shielding layer: evenly covering the first shielding layer 2 formed by braiding tinned copper wires on the outside of the isolation layer 3;

S7. Extruding the sheath layer: uniformly covering the sheath layer 1 made of halogen-free low-smoke flame-retardant polyolefin composite material on the outside of the first shielding layer 2 by extrusion;

Among them, 50 parts of EVA, 150 parts of Al(OH) ₃ , 40 parts of LDPE, 10 parts of compatibilizer, 2 parts of synergist and 0.8 parts of stabilizer.

Example 3

S1. Prepare the conductor: draw and twist the conductor material to obtain the conductor 8;

S2. Extruding the insulating layer: using an extrusion mold to coat the insulating layer 9 made of LDPE material on the outside of the conductor 8, so as to obtain the insulating core wire 6;

S3. Prepare the inner core unit: twist the two insulated core wires 6, and set the second shielding layer 5 outside the two insulated core wires 6 to obtain the inner core unit 40;

S4. Prepare the cable inner core: twist a plurality of inner core units 40 in a concentric twisting manner to obtain the cable inner core 4;

S5. Wrapping isolation layer: evenly wrap the isolation layer 3 on the outside of the cable inner core 4, and the isolation layer 3 is wrapped by polyester tape;

S6. Setting the first shielding layer: evenly covering the first shielding layer 2 formed by braiding tinned copper wires on the outside of the isolation layer 3;

S7. Extruding the sheath layer: uniformly covering the sheath layer 1 made of halogen-free low-smoke flame-retardant polyolefin composite material on the outside of the first shielding layer 2 by extrusion;

Among them, 40 parts of EVA, 160 parts of Mg(OH) ₂ , 40 parts of LDPE, 10 parts of compatibilizer, 2 parts of synergist and 0.5 parts of stabilizer.

In summary, implementing the novel computer transmission cable of the present invention and its preparation method has the following beneficial effects:

(1) The insulated core wire is covered with the second shielding layer to realize the individual shielding of the insulated core wire, and at the same time, the first shielding layer is coated outside the isolation layer to realize the total shielding of the insulated core wire. This double shielding method of shielding can further increase the transmission speed of the cable and reduce the dielectric loss and attenuation of the cable.

(2) The insulating layer made of LDPE material can increase the transmission speed of the cable and reduce the dielectric loss and attenuation. At the same time, the LDPE material greatly improves the aging resistance of the cable, improves the tensile strength of the cable, and strengthens the cable. The overall flexibility of the cable enables the insulation layer to better protect the second copper wire, avoiding damage to the insulation of the cable due to wear and tear of the insulation layer, causing potential safety hazards.

(3) The conductor is made of multiple thin soft copper wires twisted, the copper wire has a high single wire elongation and a small diameter, so that the number of copper wires required to make a conductor with the same outer diameter is much larger than that of existing The amount of thick copper wire used in the technology can effectively and evenly disperse the external force suffered by the cable, so that the conductor of the present invention has strong electrical conductivity, no hydrogen embrittlement phenomenon is not easy to break, and has extremely strong bending resistance. It will not break after more than millions of back-and-forth bending movements, ensuring that the physical and electrical performance of the cable is not affected.

(5) The sheath layer is made of halogen-free low-smoke flame-retardant polyolefin composite material, which not only meets the requirements of environmental protection and meets the general flame-retardant performance, but also has a certain waterproof performance, which can effectively prevent water from radially penetrating into the cable, thereby Extend the service life of drag chain cables.

Although the present invention is described through specific embodiments, those skilled in the art should understand that various changes and equivalent substitutions can be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the invention for a particular situation or material without departing from the scope of the invention. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but should include all implementations falling within the scope of the appended claims.

Claims (2)

1. a kind of computer transmission cable, it is characterised in that including cable inner core (4), and be coated on successively from inside to outside described Separation layer (3), first screen layer (2) and the restrictive coating (1) of cable inner core (4) outside；The cable inner core (4) is by seven inner core lists First (40) are twisted into rounded configurations in the stranded mode of concentric type, and each interior core unit (40) is mutually stranded including two Insulation core wire (6), and it is coated on the secondary shielding layer (5) of two insulation core wires (6) outside；

The first screen layer (2) and the secondary shielding layer (5) are formed by the first proof copper-wire braided, the volume of first copper wire Density is knitted more than 80%；The insulation core wire (6) includes conductor (8) and is coated on the insulating barrier (9) of the conductor (8) outside, institute The second copper wire that conductor (8) is less than 0.18mm by multifilament diameter is stated stranded to form；

First copper wire is tinned copper wire, a diameter of 0.08~0.15mm of the tinned copper wire；

The insulating barrier (9) is extruded into by LDPE foaming materials, and the thickness of the insulating barrier (9) is 0.3mm~0.8mm；

The stranded gap of two insulation core wires (6) has packed layer (7), so that the interior core unit (40) constitutes rounding Structure, the packed layer (7) is using flexible polyester fiber rope or the stranded formation of flexible reinforcement；

The separation layer (3) is formed by polyester belt is wrapped, and the thickness of the separation layer (3) is 0.03mm~0.08mm；

The restrictive coating (1) is made up of halogen-free and low-smoke flame-retardant polyolefin composite, and the halogen-free and low-smoke flame-retardant polyolefin is combined Material is included by mass fraction：EVA30 parts, Mg (OH)₂Or Al (OH)₃180 parts, 35~50 parts of LDPE, 20 parts of compatilizer, synergy 0.8 part of 2 parts of agent and stabilizer.

2. a kind of preparation method of computer transmission cable as claimed in claim 1, it is characterised in that comprise the following steps：

S1, prepare conductor：By conductor material through wire drawing, it is stranded after, obtain conductor (8)；

S2, extruded insulation layer：Using plsitive mold in the conductor (8) outer cladding insulating barrier (9) as made from LDPE materials, To obtain insulation core wire (6)；

Core unit in S3, preparation：Two insulation core wires (6) are stranded, and is set outside in two insulation core wires (6) Two screen layers (5) obtain interior core unit (40)；

S4, prepare cable inner core：The many interior core units (40) are obtained into cable inner core so that the stranded mode of concentric type is stranded (4)；

S5, wrapped separation layer：Separation layer (3) is evenly coated at the cable inner core (4) outside, the separation layer (3) is by polyester Formed with wrapped；

S6, setting first screen layer：It will be woven by tinned copper wire into first screen layer (2) and be evenly coated at the separation layer (3) outside；

S7, extrude sheath layer：Will restrictive coating (1) as made from halogen-free and low-smoke flame-retardant polyolefin composite by the way of extruding It is evenly coated at the first screen layer (2) outside.