CN116683141A - 5G radio frequency coaxial cable and preparation method thereof - Google Patents
5G radio frequency coaxial cable and preparation method thereof Download PDFInfo
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- CN116683141A CN116683141A CN202210161669.3A CN202210161669A CN116683141A CN 116683141 A CN116683141 A CN 116683141A CN 202210161669 A CN202210161669 A CN 202210161669A CN 116683141 A CN116683141 A CN 116683141A
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Abstract
The invention relates to the technical field of cables, in particular to a 5G radio frequency coaxial cable and a preparation method thereof, wherein the 5G radio frequency coaxial cable sequentially comprises an inner conductor, an inner skin layer, a foaming insulating layer, an outer skin layer, an outer conductor and a protective sleeve layer from inside to outside; the inner conductor is a spiral corrugated inner conductor, the outer conductor is a spiral corrugated outer conductor, and the spiral direction of the inner conductor is the same as the spiral direction of the outer conductor; the inner surface and the outer surface of the inner skin layer are spiral, and after the inner skin layer is tightly contacted with the inner conductor, the spiral shape of the inner surface of the inner skin layer is matched with the spiral shape of the inner conductor; the inner surface of the protective sleeve layer presents a spiral shape, and after the protective sleeve layer is tightly contacted with the outer conductor, the spiral shape of the inner surface of the protective sleeve layer is matched with the spiral shape of the outer conductor. The 5G radio frequency coaxial cable provided by the invention has the advantages of good softness, high bending property, suitability for being used in complex environments such as narrow space tower tops, more right angle turns and the like, and good electrical property.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a 5G radio frequency coaxial cable and a preparation method thereof.
Background
The development of mobile communication is more and more rapid nowadays, and the radio frequency coaxial cable used by the mobile communication base station is developing towards multiple scenes, low cost, high performance and the like. The radio frequency coaxial cable used by the mobile communication base station in the prior art consists of an inner conductor, an insulating layer, an outer conductor and a sheath. Taking a 7/8' cable as an example, as shown in figure 1, the inner conductor is of a spiral corrugated copper pipe structure; the insulating layer is composed of a skin/bubble/skin structure or a physically foamed polyethylene of a skin/bubble structure; the outer conductor is formed by an annular corrugated copper pipe; the sheath is made of polyethylene or low smoke halogen-free flame retardant polyolefin. Because the outer conductor is of an annular grain structure, the minimum repeated bending radius is 90mm, and the outer conductor is not beneficial to the use under complex environments such as narrow space tower tops, more right angle turns and the like. There is therefore a need to develop a 5G rf coaxial cable suitable for use in complex environments.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to solve the problem that the cable in the prior art is not beneficial to use in complex environments such as narrow space tower tops and more right angle turns, the invention provides the 5G radio frequency coaxial cable which is good in softness and bending performance, suitable for use in complex environments such as narrow space tower tops and more right angle turns and good in electrical performance.
The technical scheme adopted for solving the technical problems is as follows: the 5G radio frequency coaxial cable sequentially comprises an inner conductor, an inner skin layer, a foaming insulating layer, an outer skin layer, an outer conductor and a protective sleeve layer from inside to outside; the inner conductor is a spiral corrugated inner conductor, the outer conductor is a spiral corrugated outer conductor, and the spiral direction of the inner conductor is the same as the spiral direction of the outer conductor; the inner surface and the outer surface of the inner skin layer are spiral, and after the inner skin layer is in close contact with the inner conductor, the spiral shape of the inner surface of the inner skin layer is matched with the spiral shape of the inner conductor; the inner surface of the protective sleeve layer presents a spiral shape, and after the protective sleeve layer is tightly contacted with the outer conductor, the spiral shape of the inner surface of the protective sleeve layer is matched with the spiral shape of the outer conductor. The inner conductor and the outer conductor are of spiral corrugated structures, the inner layer is in close contact with the inner conductor, the protective sleeve layer is in close contact with the outer conductor, the flexibility performance is good, the bending performance is high, and the cable is suitable for being used in complex environments such as narrow space tower tops, more right-angle turns and the like, and the electrical performance is good.
Further, specifically, the inner surface of the foamed insulating layer takes on a spiral shape, and the spiral shape of the inner surface of the foamed insulating layer is mutually matched with the spiral shape of the outer surface of the inner skin layer.
Further, specifically, the outer surface of the inner conductor is formed with a spiral groove, and the outer surface of the outer conductor is formed with a spiral groove.
Further, specifically, the copper strip width of the inner conductor is smaller than that of the outer conductor, and the copper strip thickness of the inner conductor and the copper strip thickness of the outer conductor are both 0.10 mm-0.35 mm.
Further, specifically, the thickness of the inner skin layer is 0.03 to 0.1mm.
Further, specifically, the foamed insulating layer is an insulating layer formed by physically foaming polyethylene, a nucleating agent and a gas, the gas being CO 2 And C 4 F 8 Mixing of two gases, or N 2 And C 4 F 8 The two gases are mixed, and the foaming degree of the fully-closed air hole is 80-84%.
Further, specifically, the thickness of the skin layer is 0.05mm to 0.1mm.
A method for manufacturing a 5G radio frequency coaxial cable, for manufacturing a 5G radio frequency coaxial cable as described above, the method comprising the steps of:
step one, raw material detection: the method comprises the steps of detecting copper strips of the inner conductor and the outer conductor;
step two, manufacturing the inner conductor: carrying out first belt placing and belt placing on the copper belt of the inner conductor detected in the first step, carrying out surface cleaning on the copper belt of the inner conductor, carrying out fine cutting on the cleaned copper belt of the inner conductor to ensure that the width of the copper belt of the inner conductor is consistent, carrying out forming treatment on the copper belt of the inner conductor after fine cutting, forming a round tubular shape by tightly connecting the copper belt of the inner conductor after forming into a pipe joint upwards, then forming a closed smooth copper pipe inner conductor through welding, carrying out rounding on the copper pipe inner conductor, carrying out embossing on the outer surface of the copper pipe inner conductor after rounding, and rolling the outer surface of the copper pipe inner conductor into a spiral corrugated inner conductor with a spiral groove;
step three, extruding and wrapping the endothelial layer: coating the inner conductor in the second step with the inner skin layer, straightening the inner conductor through paying off of a pay-off rack, drawing and cleaning the straightened inner conductor, heating the inner skin layer by adopting low-density polyethylene, uniformly extruding and coating the inner skin layer on the outer surface of the drawn and cleaned inner conductor, vacuumizing when the inner skin layer is extruded and coated on the outer surface of the inner conductor, tightly contacting the inner skin layer with the inner conductor, and cooling the inner conductor extruded and coated with the inner skin layer after the extrusion and coating of the outer surface of the inner conductor is completed;
step four, extruding and wrapping the foaming insulating layer and the outer skin layer: coating the foaming insulating layer and the outer skin layer outside the inner skin layer in the step three, wherein the foaming insulating layer is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and gas, the polyethylene comprises high-density polyethylene and low-density polyethylene, and the weight percentages of the high-density polyethylene, the low-density polyethylene and the nucleating agent are 75% of the high-density polyethylene, 23% of the low-density polyethylene and 2% of the nucleating agent respectively;
weighing high-density polyethylene, low-density polyethylene and a nucleating agent according to a proportion, heating to a molten state to form a molten insulator, injecting the gas into the molten insulator, mixing and mixing to form a supersaturated gas-material mixture, extruding and coating the gas-material mixture on the surface of the inner skin layer to form a foaming insulating layer, heating the outer skin layer by using polyethylene material, extruding and coating the heated polyethylene on the foaming insulating layer to form the outer skin layer, cooling by air cooling and cooling by water cooling in a gradient manner to ensure that the formed insulating layer is crystallized, and finally drying;
step five: the outer conductor is manufactured by the following steps: carrying out second belt placing and belt placing on the copper belt of the outer conductor detected in the first step, carrying out surface cleaning on the copper belt of the outer conductor, carrying out finish cutting on the cleaned copper belt of the outer conductor to ensure that the width of the copper belt of the outer conductor is consistent, carrying out forming treatment on the copper belt of the outer conductor after finish cutting, forming a round tubular shape by the copper belt of the outer conductor after forming through upward and tight connection of a pipe seam, then forming a closed smooth copper pipe outer conductor through welding, carrying out rounding on the copper pipe outer conductor, putting the inner conductor of the foaming insulating layer and the outer skin layer into the rounded copper pipe outer conductor, carrying out embossing on the outer surface of the copper pipe outer conductor, and rolling the outer surface of the copper pipe outer conductor into a spiral corrugated outer conductor with a spiral groove; the spiral direction of the outer conductor is the same as that of the inner conductor in the first step;
step six: extruding the protective sleeve layer: the protective sleeve material is made of linear low-density polyethylene or low-smoke halogen-free flame-retardant polyolefin, the linear low-density polyethylene or the low-smoke halogen-free flame-retardant polyolefin is dried and melted, the melted polyethylene protective sleeve material or the low-smoke halogen-free flame-retardant polyolefin protective sleeve material is extruded and coated on the outer surface of the outer conductor in the step five, the protective sleeve layer is extruded and coated on the outer surface of the outer conductor, vacuumizing treatment is further carried out, the protective sleeve layer is in close contact with the outer surface of the outer conductor, the manufacturing of the protective sleeve layer is completed, then the protective sleeve layer is cooled through a hot water tank with the temperature of 35 ℃, and then cooled through a cold water tank with the temperature of normal temperature, so that the outer conductor radio-frequency coaxial cable is manufactured.
Preferably, in the second step, the embossing is performed by an embossing blade on an embossing device, and the thickness of the embossing blade is 2.2-2.45 mm.
Further, specifically, the purity of the gas in the fourth step is 99.99%, and the gas is CO 2 And C 4 F 8 Mixing of two gases, or N 2 And C 4 F 8 And mixing two gases, wherein the gases are in a liquid form before being injected into the molten insulator, and are gasified at a high temperature after being injected into the molten insulator to form gaseous gases.
The 5G radio frequency coaxial cable has the beneficial effects that the inner conductor is the spiral corrugated inner conductor, the outer conductor is the spiral corrugated outer conductor, the inner layer is in close contact with the inner conductor, the protective sleeve layer is in close contact with the outer conductor, the inner surface and the outer surface of the inner layer are spiral, and the inner surface of the protective sleeve layer is spiral, so that the cable has good softness and high bending performance, can be bent at will and is suitable for being used in complex environments such as narrow space tower tops, more right angle turns and the like, has good electrical performance and high practicability, and ensures the performance of the cable while improving the bending performance.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a prior art structure.
Fig. 2 is a schematic structural view of a preferred embodiment of the present invention.
1, an inner conductor; 2. an endothelial layer; 3. foaming the insulating layer; 4. an outer skin layer; 5. an outer conductor; 6. and a protective sleeve layer.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
In the description of the present invention, it should 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 2, a 5G radio frequency coaxial cable according to the preferred embodiment of the present invention comprises, from inside to outside, an inner conductor 1, an inner skin layer 2, a foamed insulating layer 3, an outer skin layer 4, an outer conductor 5 and a protective sheath layer 6; the inner conductor 1 is a spiral corrugated inner conductor, the outer conductor 5 is a spiral corrugated outer conductor, and the spiral direction of the inner conductor 1 is the same as the spiral direction of the outer conductor 5; the inner surface and the outer surface of the inner skin layer 2 are spiral, and after the inner skin layer 2 is tightly contacted with the inner conductor 1, the spiral of the inner surface of the inner skin layer 2 is matched with the spiral of the inner conductor 1; the inner surface of the protective sleeve layer 6 presents a spiral shape, and after the protective sleeve layer 6 is tightly contacted with the outer conductor 5, the spiral shape of the inner surface of the protective sleeve layer 6 is matched with the spiral shape of the outer conductor 5. The inner conductor 1 and the outer conductor 5 are both arranged into spiral corrugated structures, the inner skin layer 2 is in close contact with the inner conductor 1, the protective sleeve layer 6 is in close contact with the outer conductor 5, the cable is good in softness and high in bending property, and the cable is suitable for being used in complex environments such as narrow space tower tops, more right-angle turns and the like, and is good in electrical property.
In an embodiment, the spiral direction of the inner conductor 1 may be left or right.
In the embodiment, the inner surface of the foamed insulating layer 3 is in the form ofThe spiral shape of the inner surface of the foaming insulation layer 3 is matched with the spiral shape of the outer surface of the inner skin layer 2. The foaming insulating layer 3 is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and gas, and the gas is CO 2 And C 4 F 8 Mixing of two gases, or N 2 And C 4 F 8 The mixture of the two gases has a fully-closed air hole foaming degree of 80-84%.
In the embodiment, the outer surface of the inner conductor 1 is formed with a spiral groove, and the outer surface of the outer conductor 5 is formed with a spiral groove. The copper strip width of the inner conductor 1 is smaller than that of the outer conductor 5, and the copper strip thickness of the inner conductor 1 and the copper strip thickness of the outer conductor 5 are both 0.10 mm-0.35 mm.
In the examples, the thickness of the inner skin layer 2 is 0.03-0.1 mm, and the thickness of the outer skin layer 4 is 0.05-0.1 mm.
The manufacturing method of the 5G radio frequency coaxial cable is used for manufacturing the 5G radio frequency coaxial cable, and comprises the following steps of:
step one, raw material detection: the method comprises the steps of detecting copper strips of an inner conductor 1 and copper strips of an outer conductor 5; detecting whether the copper strip of the inner conductor 1 meets the requirements, namely the width and the thickness of the copper strip of the inner conductor 1; and detecting whether the copper strips of the outer conductor 5 meet the requirements, namely the width and the thickness of the copper strips of the outer conductor 5.
In the first step, detecting whether the liquid gas material meets the requirement, namely, whether the purity value of the liquid gas reaches 99.99%; the material of the foaming insulating layer and the material of the sheath layer are detected.
Step two, manufacturing an inner conductor 1: the copper strips of the inner conductor 1 detected in the first step are put on a belt by a first belt putting frame, the surfaces of the copper strips of the inner conductor 1 are cleaned, the cleaned copper strips of the inner conductor 1 are finely cut, the widths of the copper strips of the inner conductor 1 are consistent, the copper strips of the finely cut inner conductor 1 are subjected to forming treatment, the copper strips of the formed inner conductor 1 form a round tubular shape with upward and tight connection, then a closed smooth copper pipe inner conductor 1 is formed by welding, the copper pipe inner conductor 1 is subjected to rounding, the outer surface of the copper pipe inner conductor 1 is subjected to embossing after rounding, and the outer surface of the copper pipe inner conductor 1 is rolled into a spiral corrugated inner conductor with spiral grooves;
specifically, after the copper strip of the inner conductor 1 is subjected to surface cleaning by a first cleaning device, the copper strip of the inner conductor 1 is conveyed to a first fine cutting device, the copper strip is cut off by a high-precision cutter on the first fine cutting device, the width of the copper strip of the inner conductor 1 is consistent, welding is facilitated, the copper strip of the inner conductor 1 subjected to fine cutting is conveyed to first forming equipment, the copper strip of the inner conductor 1 subjected to fine cutting is formed into a round tube shape with a tube seam upwards and closely connected, then the tube seam is welded by adopting an automatic argon arc welding technology through a first welding unit, a closed smooth copper tube inner conductor 1 is formed, the copper tube inner conductor 1 is conveyed to first traction equipment after being subjected to rounding by a rounding die, the first traction equipment controls the speed of the copper tube inner conductor 1 entering first rolling equipment, and simultaneously, a rolling blade on the first rolling equipment rolls the copper tube inner conductor 1 into a spiral corrugated copper tube 1 with a spiral groove by controlling the rotating speed of the first rolling equipment;
in the second step, the embossing is performed by an embossing blade on embossing equipment, the thickness of the embossing blade is 2.2-2.45 mm, a spiral corrugated copper pipe inner conductor 1 with a spiral groove is formed, and the winding upper disc of the inner conductor 1 after embossing is not easy to be folded, so that the stability of a manufacturing process is improved, and the quality of a product is ensured. Further, the depth of the spiral groove formed by the embossing blade on the inner conductor 1 is 2.2-2.5 mm, so that the flexibility of the cable is further improved.
Step three, extruding and wrapping an inner skin layer 2: coating an inner skin layer 2 on the outer surface of the inner conductor 1 in the second step, paying off the inner conductor 1 through a pay-off rack, straightening the inner conductor 1, drawing and cleaning the straightened inner conductor 1, heating the inner skin layer 2 by adopting low-density polyethylene, uniformly extruding and coating the inner skin layer 2 on the outer surface of the drawn and cleaned inner conductor 1, vacuumizing when the inner skin layer 2 is extruded and coated on the outer surface of the inner conductor 1, tightly contacting the inner skin layer 2 with the inner conductor 1, and cooling the inner conductor 1 extruded and coated with the inner skin layer 2 after the extrusion and coating of the outer surface of the inner conductor 1 are finished;
specifically, the inner conductor 1 is straightened by a straightener, the straightened inner conductor 1 is pulled and conveyed to a second cleaning device for cleaning by a first wire drawing die, the cleaned inner conductor 1 enters a first plastic extruding machine, an inner skin layer 2 is heated by adopting low-density polyethylene, an inner skin layer 2 is uniformly extruded and coated on the outer surface of the inner conductor 1 by the first plastic extruding machine, the attenuation performance of a cable can be improved by adopting the low-density polyethylene, a first vacuumizing device is further arranged on a machine head of the first plastic extruding machine, the inner skin layer 2 is tightly contacted with the inner conductor 1, and after the extrusion coating of the outer surface of the inner conductor 1 is completed, the inner conductor 1 extruded and coated with the inner skin layer 2 is subjected to cooling treatment; further, a control valve is further arranged at the joint of the machine head of the first plastic extruding machine and the first vacuum device, the control valve is used for controlling the adsorption effect between the inner skin layer 2 and the inner conductor 1, in the embodiment of the invention, the inner skin layer 2 is tightly adsorbed on the inner conductor 1, and due to airtight vacuuming treatment, the inner skin layer 2 is thinned, the transmission performance is optimized, and the phenomenon that the inner skin layer 2 is broken or the inner skin layer 2 and the inner conductor 1 cannot be tightly contacted in the production process is avoided.
The inner conductor 1 extruded with the inner skin layer 2 in the third step is cooled by a 2-3-channel compressed air cooling device, and the compressed air is required to be subjected to oil-water separation so as to ensure the dryness of the surface of the inner skin layer 2. Compared with the water cooling mode adopted in the prior art, the spiral groove on the outer surface of the inner conductor 1 does not have residual moisture, and the VSWR index of the product is not deteriorated.
Step four, extruding and wrapping the foaming insulating layer 3 and the outer skin layer 4: the inner layer 2 of the third step is covered with a foaming insulating layer 3 and an outer layer 4, wherein the foaming insulating layer 3 is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and gas, the polyethylene comprises high-density polyethylene and low-density polyethylene, and the weight percentages of the high-density polyethylene, the low-density polyethylene and the nucleating agent are respectively 75 percent of the high-density polyethylene, 23 percent of the low-density polyethylene and 2 percent of the nucleating agent;
weighing high-density polyethylene, low-density polyethylene and a nucleating agent according to a proportion, heating to a molten state to form a molten insulator, injecting gas into the molten insulator, mixing and mixing to form a supersaturated gas-material mixture, extruding and coating the gas-material mixture on the surface of an inner skin layer 2 to form a foaming insulating layer 3, simultaneously heating an outer skin layer 4 by adopting polyethylene material, extruding and coating the heated polyethylene on the foaming insulating layer 3 to form the outer skin layer 4, then cooling by air, cooling by water in a gradient way, ensuring that the formed insulating layer is crystallized, and finally drying;
specifically, high-density polyethylene, low-density polyethylene and a nucleating agent are weighed according to a proportion and placed into a second extruder to be heated to form a molten insulator, gas is injected into the molten insulator through a gas injection hole on the second extruder by a pressure pump, then the molten insulator injected with the gas is conveyed to the third extruder, the third extruder mixes and mixes the insulator injected with the gas to form a supersaturated gas mixture, the inner conductor 1 coated with the inner skin layer 2 in the step three is conveyed to a die orifice of the third extruder, the gas mixture is extruded and coated on the surface of the inner skin layer 2 through a die head of the third extruder to form a foaming insulating layer 3, the die head of the third extruder is of a double-layer coextrusion structure, meanwhile, the outer skin layer 4 is made of polyethylene material, the polyethylene is heated in a fourth extruder at the temperature in the extruder, the fourth extruder is connected with the die head of the third extruder, the heated polyethylene is extruded and coated on the foaming insulating layer 3 through the die head of the third extruder to form an outer skin layer 4, then the outer skin layer 4 is cooled by an air cooling device, the inner conductor is coated with the inner skin layer 2 to form a gradient, the inner skin layer is dried through an air cooling device, the insulating layer is formed, and finally the insulating layer is dried through a drying device;
in the fourth step, the purity of the gas is 99.99%, and the gas is CO 2 And C 4 F 8 Mixing of two gases, or N 2 And C 4 F 8 The two gases are mixed, the gas is in a liquid form before being injected into the molten insulator, and the gas is gasified at high temperature after being injected into the molten insulator to form gaseous gas, so that the foaming degree of the fully-closed air hole can be up to 80-84%, which is higher than that of a product in the prior art, thereby improving the attenuation performance of the cable, reducing the insulating weight of a foaming layer, lowering the cost and improving the utilization rate of materials.
Step five: and (3) manufacturing an outer conductor 5: placing the copper strips of the outer conductor 5 detected in the first step through a second tape placing frame, cleaning the surfaces of the copper strips of the outer conductor 5, finely cutting the copper strips of the outer conductor 5 after cleaning to ensure that the widths of the copper strips of the outer conductor 5 are consistent, shaping the copper strips of the outer conductor 5 after finely cutting, forming a tubular seam by the copper strips of the outer conductor 5 after shaping, tightly connecting the tubular seam, welding to form a closed smooth copper pipe outer conductor 5, rounding the copper pipe outer conductor 5, placing the inner conductor 1 of the foam insulation layer 3 and the outer skin layer 4 in the fourth step into the rounded copper pipe outer conductor 5, embossing the outer surface of the copper pipe outer conductor 5, and rolling the outer surface of the copper pipe outer conductor 5 into a spiral corrugated outer conductor 5 with spiral grooves; the spiral direction of the outer conductor 5 is the same as the spiral direction of the inner conductor 1 in the first step; compared with the annular corrugated outer conductor 5 in the prior art, the spiral corrugated outer conductor 5 with the spiral grooves further improves the flexibility of the 5G radio frequency coaxial cable.
Specifically, the copper strip of the outer conductor 5 is conveyed to a second fine cutting device after being cleaned by a third cleaning device, the copper strip is cut off by a high-precision cutter, the width of the copper strip is consistent, welding is facilitated, the copper strip of the outer conductor 5 after fine cutting is conveyed to a second forming device, the copper strip of the outer conductor 5 after fine cutting is formed into a round tube shape with upward and tight connection of a tube seam, meanwhile, longitudinal wrapping is carried out on an inner conductor 1 of a foaming insulating layer 3 and an outer skin layer 4 which are longitudinally wrapped in a step four, then the tube seam is welded by adopting an automatic argon arc welding technology through a second welding unit, a closed smooth copper tube outer conductor 5 is formed, the copper tube outer conductor 5 is subjected to two-pass copper tube drawing by a second wire drawing die, the outer diameter of the copper tube outer conductor 5 after drawing is smaller than the outer diameter of the smooth copper tube outer conductor 5 before drawing, the second traction device controls the speed of the smooth outer conductor 5 entering a rolling device, the second traction device gives pressure between the smooth outer conductor 5 and the inner conductor 1 of the copper tube which is longitudinally wrapped with the foaming insulating layer 3 and the outer skin layer 4, and simultaneously, the second traction device controls the rotating speed of the copper tube 5 to be the same as the spiral rolling direction of the spiral rolling conductor on the second copper tube 5 in the step 5 by controlling the spiral rolling direction of the outer conductor 5;
step six: extrusion coating protective sleeve layer 6: the protective sleeve material is made of linear low-density polyethylene or low-smoke halogen-free flame-retardant polyolefin, the linear low-density polyethylene or the low-smoke halogen-free flame-retardant polyolefin is dried and melted, the melted polyethylene protective sleeve material or the low-smoke halogen-free flame-retardant polyolefin protective sleeve material is extruded and coated on the outer surface of the outer conductor 5 in the step five, the protective sleeve layer 6 is extruded and coated on the outer surface of the outer conductor 5, vacuumizing treatment is further carried out, the protective sleeve layer 6 is made to be in close contact with the outer surface of the outer conductor 5, then the protective sleeve layer 6 is made to be in contact with the outer surface of the outer conductor 5, and then the protective sleeve layer 6 is cooled through a hot water tank with the temperature of 35 ℃, and then is cooled through a cold water tank with the temperature of normal temperature, so that the 5G radio frequency coaxial cable is made.
Specifically, the linear low-density polyethylene or the low-smoke halogen-free flame-retardant polyolefin serving as a protective sleeve material is dried by a drying device, melted in a fifth plastic extruding machine, the melted polyethylene sheath material or the low-smoke halogen-free flame-retardant polyolefin sheath material is extruded and coated on the outer surface of the outer conductor 5 in the step five by a sheath extrusion die head, a second vacuumizing device is further arranged at the machine head of the fifth plastic extruding machine, the protective sleeve layer 6 is tightly contacted with the outer surface of the outer conductor 5, the manufacture of the protective sleeve layer 6 is completed, then the protective sleeve layer is cooled by a hot water tank with the temperature of 35 ℃, and then cooled by a cold water tank with the temperature of normal temperature, so that the radio-frequency coaxial cable of the outer conductor 5 is manufactured. Further, a control valve is further arranged at the joint of the machine head of the fifth plastic extruding machine and the second vacuum device, the control valve is used for controlling the adsorption effect between the protective sleeve layer 6 and the outer conductor 5, and in the embodiment of the invention, the protective sleeve layer 6 is tightly adsorbed on the outer conductor 5, so that the bending radius of the 5G radio frequency coaxial cable is reduced to a greater extent, and the original 90mm repeated bending radius is improved to 55mm.
In the embodiment of the invention, the power of the first vacuum device and the second vacuum device is 2.2KW. The inner sheath layer 2 is closely contacted with the inner conductor 1, and the sheath layer is closely contacted with the outer conductor 5, so that the flexibility of the 5G radio frequency coaxial cable is further improved.
Taking a 7/8' cable as an example, the 5G RF coaxial cable of the prior art (as shown in FIG. 1) and the embodiments of the present invention were tested. The above test is performed by a conventional test method in the art, and is not particularly limited herein. The test results are shown in Table 1
Table 1 shows the results of performance test of 5G RF coaxial cable
As can be seen from Table 1, the voltage standing wave ratio of the embodiment of the invention is smaller than that of the prior art, when the bending radius is 90mm after single bending, the voltage standing wave ratio of the embodiment of the invention is smaller than that of the prior art, when the bending radius is 55mm, the voltage standing wave ratio of the embodiment of the invention is smaller than that of the prior art, in addition, when the bending radius is 55mm, when the standing wave test frequency band is 1880 MHz-2180 MHz, 2300 MHz-2500 MHz, 2500 MHz-2700 MHz,4800MHz-5000MHz, the voltage standing wave ratio is larger than 1.2, which does not accord with the stipulated value of the industry standard, when the bending radius is 55mm, the voltage standing wave ratio of the cable of the invention is smaller than 1.2, and the voltage standing wave ratio surplus of the embodiment of each frequency band is larger, therefore, the electrical performance of the 5G radio frequency coaxial cable of the invention is good, and the electrical performance of the cable is still guaranteed to be satisfied at the frequency band of 4800MHz-5000MHz, and the electrical performance of the cable is guaranteed to be satisfied at the frequency band of 4800MHz-5000 MHz.
According to the 5G radio frequency coaxial cable disclosed by the invention, the inner conductor 1 is the spiral corrugated inner conductor, the outer conductor 5 is the spiral corrugated outer conductor, the inner sheath layer 2 is in close contact with the inner conductor 1, the protective sleeve layer 6 is in close contact with the outer conductor 5, the inner surface and the outer surface of the inner sheath layer 2 are spiral, and the inner surface of the protective sleeve layer 6 is spiral, so that the cable is good in softness and high in bending performance, can be bent at will and suitable for being used in complex environments such as narrow space tower tops, more right angle turns and the like, is good in electrical performance, high in practicability, and ensures the electrical performance of the cable while improving the bending performance.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. A 5G radio frequency coaxial cable, characterized in that: the composite material comprises an inner conductor (1), an inner lining layer (2), a foaming insulating layer (3), an outer skin layer (4), an outer conductor (5) and a protective sleeve layer (6) from inside to outside in sequence;
the inner conductor (1) is a spiral corrugated inner conductor, the outer conductor (5) is a spiral corrugated outer conductor, and the spiral direction of the inner conductor (1) is the same as the spiral direction of the outer conductor (5);
the inner surface and the outer surface of the inner lining layer (2) are spiral, and after the inner lining layer (2) is tightly contacted with the inner conductor (1), the spiral shape of the inner surface of the inner lining layer (2) is matched with the spiral shape of the inner conductor (2);
the inner surface of the protective sleeve layer (6) presents a spiral shape, and after the protective sleeve layer (6) is tightly contacted with the outer conductor (5), the spiral shape of the inner surface of the protective sleeve layer (6) is matched with the spiral shape of the outer conductor (4).
2. The 5G radio frequency coaxial cable of claim 1, wherein: the inner surface of the foaming insulating layer (3) presents a spiral shape, and the spiral shape of the inner surface of the foaming insulating layer (3) is matched with the spiral shape of the outer surface of the inner skin layer (2).
3. The 5G radio frequency coaxial cable of claim 1, wherein: the outer surface of the inner conductor (1) is provided with a spiral groove, and the outer surface of the outer conductor (5) is provided with a spiral groove.
4. A 5G radio frequency coaxial cable according to claim 3, wherein: the copper strip width of the inner conductor (1) is smaller than that of the outer conductor (5), and the copper strip thickness of the inner conductor (1) and the copper strip thickness of the outer conductor (5) are both 0.10-0.35 mm.
5. The 5G radio frequency coaxial cable of claim 1, wherein: the thickness of the inner layer (2) is 0.03-0.1 mm.
6. The 5G radio frequency coaxial cable of claim 1, wherein: the foaming insulating layer (3) is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and gas, and the gas is CO 2 And C 4 F 8 Mixing of two gases, or N 2 And C 4 F 8 The two gases are mixed, and the foaming degree of the fully-closed air hole is 80-84%.
7. The 5G radio frequency coaxial cable of claim 1, wherein: the thickness of the outer skin layer (4) is 0.05 mm-0.1 mm.
8. The manufacturing method of the 5G radio frequency coaxial cable is characterized by comprising the following steps of: a method for making a 5G radio frequency coaxial cable according to any one of claims 1-7, the method comprising the steps of:
step one, raw material detection: comprises detecting the copper strips of the inner conductor (1) and the copper strips of the outer conductor (5);
step two, the inner conductor (1) is manufactured: carrying out first strip placing and strip placing on the copper strip of the inner conductor (1) detected in the first step, carrying out surface cleaning on the copper strip of the inner conductor, carrying out finish cutting on the cleaned copper strip of the inner conductor (1) to ensure that the width of the copper strip of the inner conductor (1) is consistent, carrying out forming treatment on the copper strip of the inner conductor (1) after finish cutting, forming a round tubular shape by the copper strip of the inner conductor (1) after forming a pipe gap upwards and being closely connected, then forming a closed smooth copper pipe inner conductor through welding, carrying out rounding on the copper pipe inner conductor, carrying out embossing on the outer surface of the copper pipe inner conductor after rounding, and rolling the outer surface of the copper pipe inner conductor into a spiral corrugated inner conductor with a spiral groove;
step three, extruding and wrapping the endothelial layer (2): coating the inner conductor (1) in the second step with the inner layer (2), paying off the inner conductor (1) in the second step through a pay-off rack, straightening the inner conductor (1), drawing and cleaning the straightened inner conductor (1), heating the inner layer (2) by adopting low-density polyethylene, uniformly extruding and coating the inner layer (2) on the outer surface of the drawn and cleaned inner conductor (1), vacuumizing when the inner layer is extruded and coated on the outer surface of the inner conductor, tightly contacting the inner layer (2) with the inner conductor (1), and cooling the inner conductor (1) extruded with the inner layer (2) after the extrusion and coating of the outer surface of the inner conductor (1) is completed;
step four, extruding and wrapping the foaming insulating layer (3) and the outer skin layer (4): coating the foaming insulating layer (3) and the outer skin layer (4) outside the inner skin layer (2) in the step three, wherein the foaming insulating layer (3) is an insulating layer formed by physical foaming of polyethylene, a nucleating agent and gas, the polyethylene comprises high-density polyethylene and low-density polyethylene, and the weight percentages of the high-density polyethylene, the low-density polyethylene and the nucleating agent are 75% of the high-density polyethylene, 23% of the low-density polyethylene and 2% of the nucleating agent respectively;
weighing high-density polyethylene, low-density polyethylene and a nucleating agent according to a proportion, heating to a molten state to form a molten insulator, injecting the gas into the molten insulator, mixing and mixing to form a supersaturated gas-material mixture, extruding and coating the gas-material mixture on the surface of the inner skin layer (2) to form a foaming insulating layer (3), meanwhile, adopting polyethylene material for the outer skin layer (4), heating the polyethylene at a temperature, extruding and coating the heated polyethylene on the foaming insulating layer (3) to form the outer skin layer (4), cooling by air cooling and cooling by water cooling in a gradient mode to ensure that the formed insulating layer is crystallized, and finally drying;
step five: the outer conductor (5) is manufactured by: carrying out second belt placing and belt placing on the copper belt of the outer conductor (5) detected in the first step, carrying out surface cleaning on the copper belt of the outer conductor (5), carrying out finish cutting on the cleaned copper belt of the outer conductor (5), enabling the width of the copper belt of the outer conductor (5) to be consistent, carrying out forming treatment on the copper belt of the outer conductor (5) after finish cutting, enabling the formed copper belt of the outer conductor (5) to form a round tubular shape with upward pipe gaps and close connection, then forming a closed smooth copper pipe outer conductor through welding, carrying out rounding on the copper pipe outer conductor, putting the copper pipe outer conductor (1) subjected to foaming insulation layer (3) and outer skin layer (4) into the rounded copper pipe outer conductor, carrying out embossing on the outer surface of the copper pipe outer conductor, and rolling the outer surface of the copper pipe outer conductor into a spiral corrugated outer conductor with spiral grooves; the spiral direction of the outer conductor (5) is the same as the spiral direction of the inner conductor (1) in the step one;
step six: extruding the protective sleeve layer (6): the protective sleeve (6) is made of linear low-density polyethylene or low-smoke halogen-free flame-retardant polyolefin, the linear low-density polyethylene or the low-smoke halogen-free flame-retardant polyolefin is dried and melted, the melted polyethylene sheath material or the low-smoke halogen-free flame-retardant polyolefin sheath material is extruded and coated on the outer surface of the outer conductor (5) in the step five, the protective sleeve layer (6) is extruded and coated on the outer surface of the outer conductor (5) and subjected to vacuumizing treatment, the protective sleeve layer (6) is tightly contacted with the outer surface of the outer conductor (5), the manufacturing of the protective sleeve layer (6) is completed, and then the protective sleeve layer is cooled through a hot water tank with the temperature of 35 ℃, and then cooled through a cold water tank with the temperature of normal temperature, so that the radio-frequency coaxial cable of the outer conductor (5) is manufactured.
9. The method for manufacturing a 5G rf coaxial cable according to claim 8, wherein: in the second step, embossing is performed by an embossing blade on embossing equipment, and the thickness of the embossing blade is 2.2-2.45 mm.
10. The method for manufacturing a 5G rf coaxial cable according to claim 8, wherein: the purity of the gas in the fourth step is 99.99%, and the gas is CO 2 And C 4 F 8 Mixing of two gases, or N 2 And C 4 F 8 And mixing two gases, wherein the gases are in a liquid form before being injected into the molten insulator, and are gasified at a high temperature after being injected into the molten insulator to form gaseous gases.
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| CN117476290A (en) * | 2023-11-13 | 2024-01-30 | 中天射频电缆有限公司 | Method for manufacturing radio frequency coaxial cable, radio frequency coaxial cable and manufacturing device |
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| CN117476290A (en) * | 2023-11-13 | 2024-01-30 | 中天射频电缆有限公司 | Method for manufacturing radio frequency coaxial cable, radio frequency coaxial cable and manufacturing device |
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