A production process for a phase-stable coaxial cable

Abstract

The present invention relates to the field of coaxial cables, and solves the problems that the existing coaxial cables have poor mechanical phase stability and the cost of coaxial cables prepared by the method of full wrapping is too high. Specifically, it relates to a coaxial cable with stable phase; the raw materials of the insulating layer and the outer jacket layer of the coaxial cable with stable phase are both insulating and heat-conducting materials, which have good high and low temperature resistance, corrosion resistance, insulation performance and heat-conducting performance. They can timely discharge the heat generated during the operation of the coaxial cable and will not be deformed by heat, resulting in a significant decrease in the mechanical phase stability of the coaxial cable. Moreover, by first wrapping a PTFE microporous tape outside the metal conductor and then injection molding to form an outer sleeve, the toughness and mechanical properties of the coaxial cable can be improved, thereby enhancing its mechanical phase stability. In addition, the coaxial cable combines the methods of solid injection molding and wrapping, and the prepared coaxial cable has low cost but excellent mechanical phase stability.

Description

Technical Field

[0001] The present invention relates to the field of coaxial cables, and particularly to a production process of a coaxial cable with stable phase. Background Art

[0002] Coaxial cables can be used for the transmission of analog and digital signals and are suitable for a variety of applications, among which the most important are television propagation, long-distance telephone transmission, short-distance connection between computer systems, and local area networks, etc. Coaxial cables have developed rapidly as a means of spreading television signals to thousands of households, which is cable television. A cable television system can carry dozens or even hundreds of television channels, and its propagation range can reach dozens of kilometers. For a long time, coaxial cables have been an important part of the long-distance telephone network. Today, it faces increasingly fierce competition from optical fibers, terrestrial microwaves, and satellites.

[0003] In the existing coaxial cables, there are an inner conductor, an intermediate insulating layer, an outer conductor, and an outer sheath arranged in sequence from the inside out. For such a cable with a multi-layer structure, when it works under high-temperature conditions or at low temperatures, due to the different expansion and contraction coefficients between the layers, voids are generated between the layers, resulting in a loose internal structure of the cable, thereby greatly reducing the mechanical phase stability of the cable. Moreover, if the coaxial cable is prepared by an all-wrapping method, there is a disadvantage of excessive manufacturing cost. How to improve the poor mechanical phase stability of the existing coaxial cables and the excessive cost of the coaxial cable prepared by the all-wrapping method is the key to the present invention. Therefore, there is an urgent need for a production process of a coaxial cable with stable phase to solve the above problems. Summary of the Invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a production process of a coaxial cable with stable phase: by adding high-density polyethylene, insulating and heat-conducting filler, polyethylene wax, calcium stearate, dibutyl phthalate, antioxidant 1010, and UV-P into a mixer, mixing evenly to obtain a mixture, adding the mixture into a twin-screw extruder for melting and extrusion, granulating through a granulator to obtain insulating and heat-conducting material, injecting the insulating and heat-conducting material on the surface of a silver-plated copper wire to form a core wire, then wrapping 1-2 layers of aluminum foil on the core wire to obtain a metal conductor, inserting the end of the metal conductor into a coaxial cable forming machine for wrapping PTFE microporous tape and injecting to form an outer sleeve, obtaining a coaxial cable with stable phase, and solving the problems of poor mechanical phase stability of the existing coaxial cables and excessive cost of the coaxial cable prepared by the all-wrapping method.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A production process of a coaxial cable with stable phase is prepared by the following steps:

[0007] Step 1: Weigh 75 - 95 parts by weight of high - density polyethylene, 5 - 25 parts of insulating and heat - conducting filler, 1.5 - 2.5 parts of polyethylene wax, 2 - 4 parts of calcium stearate, 1.2 - 1.8 parts of dibutyl phthalate, 1 - 3 parts of antioxidant 1010, and 1.5 - 2.5 parts of UV - P, and set aside.

[0008] Step 2: Add high - density polyethylene, insulating and heat - conducting filler, polyethylene wax, calcium stearate, dibutyl phthalate, antioxidant 1010, and UV - P into a mixer, and obtain a mixture after mixing evenly.

[0009] Step 3: Add the mixture into a twin - screw extruder for melt extrusion, and obtain insulating and heat - conducting material after pelletizing by a pelletizer.

[0010] Step 4: Inject the insulating and heat - conducting material on the surface of a silver - plated copper wire to form a core wire, and then wrap 1 - 2 layers of aluminum foil on the core wire to obtain a metal conductor.

[0011] Step 5: Insert the end of the metal conductor into the threading hole of a coaxial cable forming machine, wind the end of the PTFE microporous tape on the take - up reel around the metal conductor, then insert it into the threading cylinder, and then use a tractor to pull it forward.

[0012] Step 6: Start the drive motor. The drive motor rotates to drive the driving gear to rotate. Then the driving gear drives the driving disk to rotate on the guide rail through a toothed belt, so that the take - up reel rotates around the metal conductor. Start the unwind motor. The unwind motor rotates to drive the take - up reel to rotate. During the rotation of the take - up reel, the PTFE microporous tape is continuously released and wound around the metal conductor.

[0013] Step 7: Put the insulating and heat - conducting material into the feeding hopper, start the extruder. The operating extruder heats and shears the insulating and heat - conducting material entering the extruder through the feeding hopper to form a molten material. The molten material enters the liquid storage chamber through the discharge pipe and flows through the liquid spraying holes into the threading cylinder, and adheres to the metal conductor wound with the PTFE microporous tape. During the movement of the metal conductor in the threading cylinder, when passing by the inner side of the cooling chamber, due to the decrease in diameter, the molten material on the metal conductor is scraped and leveled. Then start the circulation pump. The circulation pump operates to transport the cooling water in the water storage tank through the water inlet to the cooling chamber, and then returns to the water storage tank through the drain port to form a circulating cooling water. The cooling water cools and shapes the molten material on the metal conductor, and then outputs from the end of the threading cylinder to obtain the coaxial cable with stable phase.

[0014] As a further scheme of the present invention: The insulating and heat - conducting filler is prepared by the following steps:

[0015] A1: Add carbon nanotubes and mixed acid into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 3 - 4 h under the conditions of a temperature of 25 - 30 °C and a stirring rate of 350 - 450 r / min. Then, perform vacuum filtration. Wash the filter cake with distilled water until it is neutral. After that, place it in a vacuum drying oven and dry it for 3 - 5 h under the condition of a temperature of 50 - 60 °C to obtain acidified carbon nanotubes;

[0016] A2: Add acidified carbon nanotubes, absolute ethanol, and deionized water into a four-necked flask equipped with a stirrer, a thermometer, a gas guide tube, a reflux condenser, and a constant pressure dropping funnel. Ultrasonically disperse for 1 - 2 h under the condition of an ultrasonic frequency of 45 - 55 kHz. Then, while stirring under the conditions of a temperature of 25 - 30 °C and a stirring rate of 350 - 450 r / min, gradually add hydrochloric acid solution dropwise to adjust the pH to 4 - 4.5. After that, gradually add 3-aminopropyltriethoxysilane dropwise while stirring, control the dropping rate at 1 - 2 drops / s. After the dropping is completed, introduce nitrogen protection. Then, raise the temperature to 60 - 65 °C and stir and react for 20 - 30 h. After the reaction is completed, perform vacuum filtration on the reaction product. Wash the filter cake with distilled water until it is neutral. After that, place it in a vacuum drying oven and dry it for 3 - 5 h under the condition of a temperature of 50 - 60 °C to obtain modified carbon nanotubes;

[0017] A3: Irradiate PTFE powder for 40 - 50 h under the protection of nitrogen and a radiation energy of 0.4 - 0.5 KGy / h to obtain pretreated PTFE powder;

[0018] A4: Add pretreated PTFE powder, acrylic acid, triallyl isocyanurate, and 1,4-dioxane into a three-necked flask equipped with a stirrer, a thermometer, and a gas guide tube. Introduce nitrogen protection. Stir and react for 3 - 4 h under the conditions of a temperature of 65 - 70 °C and a stirring rate of 350 - 450 r / min. Then, add modified carbon nanotubes and continue to stir and react for 8 - 10 h. After the reaction is completed, perform vacuum filtration on the reaction product. Wash the filter cake with distilled water 2 - 3 times. After that, place it in a vacuum drying oven and dry it for 8 - 10 h under the condition of a temperature of 60 - 65 °C to obtain insulating and heat-conducting filler.

[0019] As a further scheme of the present invention: The dosage ratio of the carbon nanotubes to the mixed acid in step A1 is 1 g : 50 - 60 mL. The mixed acid is a mixture of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 2 - 3 : 1. The mass fraction of the concentrated sulfuric acid is 98%, and the mass fraction of the concentrated nitric acid is 68%.

[0020] As a further solution of the present invention: the dosage ratio of the acidified carbon nanotubes, absolute ethanol, deionized water and aminopropyltriethoxysilane in step A2 is 10 g: 200 - 250 mL: 30 - 40 mL: 4 - 10 mL, and the mass fraction of the hydrochloric acid solution is 20 - 25%.

[0021] As a further solution of the present invention: the dosage ratio of the pretreated PTFE powder, acrylic acid, triallyl isocyanurate, 1,4 - dioxane and modified carbon nanotubes in step A4 is 20 g: 15 - 25 g: 1.2 - 1.5 g: 80 - 100 mL: 5 - 15 g.

[0022] As a further solution of the present invention: the coaxial cable forming machine includes a winding mechanism and a forming mechanism. The forming mechanism includes a mounting base and an extruder. The extruder is mounted on the top of the mounting base. A feeding hopper is mounted on the top of the extruder. A discharge pipe is mounted at the bottom of the output end of the extruder. The bottom end of the discharge pipe is connected to the top end of a forming cylinder. Two support columns are mounted at the bottom of the barrel of the extruder. The two support columns are located on both sides of the discharge pipe. The forming cylinder is mounted on a support frame;

[0023] The winding mechanism includes a water storage tank and a mounting frame. The mounting frame is mounted on the top of the water storage tank. An installation shell is mounted on the top of the mounting frame. An installation disk is arranged inside the installation shell. A threading hole is opened at the center of the installation disk. A tape take - up reel is rotatably mounted on one side surface of the installation disk. A PTFE microporous tape is wound on the tape take - up reel. A tape pay - out motor is arranged on the other side surface of the installation disk. The output shaft of the tape pay - out motor penetrates through the installation disk and is connected to the tape take - up reel.

[0024] As a further solution of the present invention: liquid storage chambers and cooling chambers are respectively arranged at both ends of the inner wall of the forming cylinder. A threading cylinder is arranged inside the forming cylinder. The liquid storage chamber is communicated with the discharge pipe. A plurality of liquid spraying holes are opened on the liquid storage chamber. All the plurality of liquid spraying holes are communicated to the inner cavity of the threading cylinder. A water inlet is opened at one end of the cooling chamber far from the discharge pipe. A drain port is opened at the top side of one end of the cooling chamber close to the discharge pipe. The diameter of one end of the threading cylinder close to the liquid spraying holes is larger than that of the end far from the liquid spraying holes.

[0025] As a further solution of the present invention: a transmission disk is arranged in the inner cavity of the installation shell. Meshing teeth are arranged on the outer side of the transmission disk. The inner side of the transmission disk is connected to the outer side of the installation disk. The thickness of the transmission disk is larger than that of the installation disk. A guide rail is mounted on the inner side of the installation shell. The guide rail is slidably connected to the connection parts of the transmission disk and the installation disk.

[0026] As a further solution of the present invention: a drive motor is installed on one side of the mounting frame, a driving gear is sleeved on the output shaft of the drive motor, the driving gear is located inside one end of the toothed belt and is meshed and connected with the toothed belt, the other end inside of the toothed belt is sleeved on the transmission disc and is meshed and connected with the transmission disc, a connecting frame is installed on one side of the mounting frame, a tensioning wheel is rotatably installed inside the connecting frame, and the tensioning wheel abuts against the outer side of the toothed belt.

[0027] As a further solution of the present invention: a circulation pump is installed on the other side of the mounting frame, the output end of the circulation pump is communicated with the water inlet through a pipeline, the input end of the circulation pump is communicated with the water storage tank through a pipeline, and the water storage tank is communicated with the drain port through a pipeline.

[0028] As a further solution of the present invention: the two support columns are symmetrically arranged on both sides of the top of the mounting shell, the support frame is installed on the mounting frame, and the support frame is erected above the circulation pump.

[0029] The beneficial effects of the present invention:

[0030] For a phase-stable coaxial cable of the present invention, by adding high-density polyethylene, insulating and heat-conducting filler, polyethylene wax, calcium stearate, dibutyl phthalate, antioxidant 1010, and UV-P into a mixer, after mixing evenly, a mixture is obtained. The mixture is added into a twin-screw extruder for melt extrusion, and then granulated by a granulator to obtain insulating and heat-conducting material. The insulating and heat-conducting material is injection-molded on the surface of a silver-plated copper wire to form a core wire. Then, 1-2 layers of aluminum foil are wrapped around the core wire to obtain a metal conductor. The end of the metal conductor is inserted into a coaxial cable forming machine to wind a PTFE microporous tape and injection-mold an outer sleeve to obtain a phase-stable coaxial cable; the insulating layer raw material and the outer sleeve layer raw material of the phase-stable coaxial cable are both insulating and heat-conducting materials, both of which have good high and low temperature resistance, corrosion resistance, insulation performance, and heat conduction performance, can timely discharge the heat generated during the operation of the coaxial cable and will not be deformed by heat, resulting in a significant decrease in the mechanical phase stability of the coaxial cable. Moreover, by first winding a PTFE microporous tape outside the metal conductor and then injection-molding an outer sleeve, the toughness and mechanical properties of the coaxial cable can be improved, thereby enhancing its mechanical phase stability. Moreover, the coaxial cable combines the methods of solid injection molding and winding, and the manufactured coaxial cable has a low cost but excellent mechanical phase stability.

[0031] In the process of preparing the coaxial cable, an insulating and thermally conductive filler was first prepared. First, the carbon nanotubes were acidified with a mixed acid to introduce a large number of carboxyl groups on the particle surface of the carbon nanotubes, providing active sites to obtain acidified carbon nanotubes. Then, after the hydrolysis of aminopropyltriethoxysilane to form silane, the acidified carbon nanotubes were treated to introduce a large number of amino groups, hydroxyl groups and Si-O chains on the surface of the acidified carbon nanotubes to obtain modified carbon nanotubes. By irradiating the PTFE powder, a large number of free radicals were contained in the molecular chain of the irradiated PTFE powder, which could graft acrylic acid onto the surface to improve its dispersibility and introduce a large number of carboxyl groups at the same time. Then, it was reacted with the modified carbon nanotubes. The carboxyl groups on the PTFE powder reacted with the amino groups and hydroxyl groups on the modified carbon nanotubes, and the two could be combined together by chemical bonds to obtain the insulating and thermally conductive filler. Moreover, the particle surface of the insulating and thermally conductive filler contained a large number of active groups and long chains, which could be well dispersed in high-density polyethylene and enhance its binding force through the active groups. PTFE has good high and low temperature resistance, corrosion resistance, weather resistance, non-stickiness and self-lubricating properties, and at the same time has excellent dielectric properties and extremely low friction coefficients, and its comprehensive performance is very excellent. Carbon nanotubes have good mechanical properties and thermal conductivity. The prepared insulating and thermally conductive filler through modification improves the disadvantage of poor dispersibility of the two single substances. Therefore, after being added to high-density polyethylene, it endows it with good mechanical properties, insulating properties and thermal conductivity, thereby improving the mechanical phase stability of the coaxial cable;

[0032] In the process of manufacturing the coaxial cable, a coaxial cable forming machine is also used. By inserting the end of the metal conductor into the wire threading hole of the coaxial cable forming machine, the end of the PTFE microporous tape on the tape reel is wound around the metal conductor, and then it is inserted into the wire threading cylinder. After that, it is pulled forward by a tractor. During the process of the metal conductor being pulled forward, the driving motor runs to rotate the metal conductor, and the unwinding motor rotates to continuously release the PTFE microporous tape from the tape reel and wind the PTFE microporous tape around the metal conductor. The insulating and heat-conducting material is heated and sheared by an extruder to form a molten material. The molten material enters the liquid storage chamber through the discharge pipe and flows from the liquid spraying holes into the wire threading cylinder, adhering to the metal conductor around which the PTFE microporous tape is wound. When passing through the inner side of the cooling chamber, due to the decrease in diameter, the molten material on the metal conductor is scraped and leveled, and then the molten material on the metal conductor is cooled and shaped to obtain the coaxial cable with stable phase. The coaxial cable forming machine continuously winds the PTFE microporous tape around the metal conductor through the winding mechanism, which can fully wrap the metal conductor, improve the toughness of the metal conductor, reduce the probability of its cracking, bending or even breaking, and maintain its shape continuously. Then the wound metal conductor is directly injection-molded through the molding mechanism. The raw material is the insulating and heat-conducting material. The injection-molded outer sleeve has good mechanical properties and heat-conducting properties, further stabilizing its shape and temperature. The good heat-conducting property can quickly export the heat generated by the coaxial cable, thus further improving the mechanical phase stability of the coaxial cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Figure 1 It is a schematic structural diagram of the coaxial cable forming machine in the present invention;

[0035] Figure 2 It is a schematic structural diagram of the molding mechanism in the present invention;

[0036] Figure 3 It is a schematic internal structure diagram of the molding cylinder in the present invention;

[0037] Figure 4 It is a schematic structural diagram of the winding mechanism in the present invention;

[0038] Figure 5 It is a three-dimensional schematic diagram of the winding mechanism in the present invention;

[0039] Figure 6 It is a schematic internal structure diagram of the winding mechanism in the present invention.

[0040] In the figure: 101, mounting base; 102, extruder; 103, feeding hopper; 104, discharge pipe; 105, support column; 106, forming cylinder; 107, support frame; 108, wire threading cylinder; 109, liquid storage chamber; 110, cooling chamber; 111, liquid spraying hole; 112, water inlet; 113, drain outlet; 201, water storage tank; 202, mounting frame; 203, mounting disc; 204, wire threading hole; 205, tape take-up reel; 206, circulation pump; 207, mounting shell; 208, unwinding motor; 209, driving motor; 210, driving gear; 211, connecting frame; 212, tensioning pulley; 213, toothed belt; 214, driving disc; 215, guide rail. Detailed implementation mode

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Embodiment

[0042] This embodiment is a preparation method of an insulating and heat-conducting filler, including the following steps:

[0043] A1: Add a mixed acid formed by mixing 1 g of carbon nanotubes, 50 mL of concentrated sulfuric acid with a mass fraction of 98% and concentrated nitric acid with a mass fraction of 68% in a volume ratio of 2:1 into a three-necked flask equipped with a stirrer and a thermometer, and stir and react for 3 h under the conditions of a temperature of 25 °C and a stirring rate of 350 r / min. Then, perform vacuum filtration, wash the filter cake with distilled water until it is neutral, and then place it in a vacuum drying oven and dry it for 3 h under the condition of a temperature of 50 °C to obtain acidified carbon nanotubes;

[0044] A2: Add 10 g of acidified carbon nanotubes, 200 mL of absolute ethanol, and 30 mL of deionized water into a four-necked flask equipped with a stirrer, a thermometer, a gas guide tube, a reflux condenser, and a constant pressure dropping funnel, and ultrasonically disperse for 1 h under the condition of an ultrasonic frequency of 45 kHz. Then, while stirring at a temperature of 25 °C and a stirring rate of 350 r / min, gradually add a hydrochloric acid solution with a mass fraction of 20% to adjust the pH to 4, and then gradually add 4 mL of aminopropyltriethoxysilane drop by drop while stirring, controlling the dropping rate to be 1 drop / s. After the dropping is completed, introduce nitrogen protection, and then raise the temperature to 60 °C and stir and react for 20 h. After the reaction is completed, perform vacuum filtration on the reaction product, wash the filter cake with distilled water until it is neutral, and then place it in a vacuum drying oven and dry it for 3 h under the condition of a temperature of 50 °C to obtain modified carbon nanotubes;

[0045] A3: Irradiate PTFE powder for 40 h under nitrogen protection and a radiation energy of 0.4 KGy / h to obtain pretreated PTFE powder;

[0046] A4: Add 20 g of pretreated PTFE powder, 15 g of acrylic acid, 1.2 g of triallyl isocyanurate, and 80 mL of 1,4-dioxane into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection. Stir and react for 3 h at a temperature of 65 °C and a stirring rate of 350 r / min. Then add 5 g of modified carbon nanotubes and continue to stir and react for 8 h. After the reaction, vacuum filter the reaction product, wash the filter cake twice with distilled water, and then place it in a vacuum drying oven. Dry it for 8 h at a temperature of 60 °C to obtain the insulating and thermally conductive filler. Example

[0047] This example is a preparation method of an insulating and thermally conductive filler, including the following steps:

[0048] A1: Add a mixed acid composed of 1 g of carbon nanotubes, 60 mL of concentrated sulfuric acid with a mass fraction of 98%, and concentrated nitric acid with a mass fraction of 68% in a volume ratio of 3:1 into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 4 h at a temperature of 30 °C and a stirring rate of 450 r / min. Then vacuum filter, wash the filter cake with distilled water until it is neutral, and then place it in a vacuum drying oven. Dry it for 5 h at a temperature of 60 °C to obtain acidified carbon nanotubes;

[0049] A2: Add 10 g of acidified carbon nanotubes, 250 mL of absolute ethanol, and 40 mL of deionized water into a four-necked flask equipped with a stirrer, a thermometer, a gas pipe, a reflux condenser, and a constant pressure dropping funnel. Ultrasonically disperse for 2 h under an ultrasonic frequency of 55 kHz. Then, while stirring, gradually add a hydrochloric acid solution with a mass fraction of 25% to adjust the pH to 4.5 at a temperature of 30 °C and a stirring rate of 450 r / min. Then, while stirring, gradually add 10 mL of aminopropyltriethoxysilane, control the dropping rate at 2 drops / s. After dropping, introduce nitrogen for protection, and then raise the temperature to 65 °C and stir and react for 30 h. After the reaction, vacuum filter the reaction product, wash the filter cake with distilled water until it is neutral, and then place it in a vacuum drying oven. Dry it for 5 h at a temperature of 60 °C to obtain modified carbon nanotubes;

[0050] A3: Irradiate PTFE powder for 50 h under nitrogen protection and a radiation energy of 0.5 KGy / h to obtain pretreated PTFE powder;

[0051] A4: Add 20 g of pretreated PTFE powder, 25 g of acrylic acid, 1.5 g of triallyl isocyanurate, and 100 mL of 1,4-dioxane into a three-necked flask equipped with a stirrer, a thermometer, and a gas pipe. Introduce nitrogen for protection. Stir and react at a temperature of 70 °C and a stirring rate of 450 r / min for 4 h. Then add 15 g of modified carbon nanotubes and continue to stir and react for 10 h. After the reaction, vacuum filter the reaction product, wash the filter cake 3 times with distilled water, and then place it in a vacuum drying oven and dry it at a temperature of 65 °C for 10 h to obtain the insulating and heat-conducting filler. Example

[0052] Please refer to Figure 1-6 As shown, this example is a coaxial cable forming machine, including a winding mechanism and a forming mechanism. The forming mechanism includes a mounting base 101 and an extruder 102. The extruder 102 is installed on the top of the mounting base 101. A feeding hopper 103 is installed on the top of the extruder 102. The bottom of the output end of the extruder 102 is installed with a discharge pipe 104. The bottom end of the discharge pipe 104 is connected to one end of the top of the forming cylinder 106. Two support columns 105 are installed at the bottom of the barrel of the extruder 102. The two support columns 105 are located on both sides of the discharge pipe 104. The forming cylinder 106 is installed on the support frame 107;

[0053] Liquid storage chambers 109 and a cooling chamber 110 are respectively arranged at both ends of the inner wall of the forming cylinder 106. A wire threading cylinder 108 is arranged inside the forming cylinder 106. The liquid storage chamber 109 is communicated with the discharge pipe 104. A number of liquid spraying holes 111 are opened on the liquid storage chamber 109. All the liquid spraying holes 111 are communicated to the inner cavity of the wire threading cylinder 108. A water inlet 112 is opened at one end of the cooling chamber 110 away from the discharge pipe 104. A drain port 113 is opened on the top side of the cooling chamber 110 close to the discharge pipe 104. The diameter of one end of the wire threading cylinder 108 close to the liquid spraying holes 111 is larger than that of the end away from the liquid spraying holes 111;

[0054] The winding mechanism includes a water storage tank 201 and a mounting frame 202. The mounting frame 202 is installed on the top of the water storage tank 201. An installation shell 207 is installed on the top of the mounting frame 202. An installation disk 203 is arranged inside the installation shell 207. A wire threading hole 204 is opened at the center of the installation disk 203. A tape winding disk 205 is rotatably installed on one side surface of the installation disk 203. A PTFE microporous tape is wound on the tape winding disk 205. A tape unwinding motor 208 is arranged on the other side surface of the installation disk 203. The output shaft of the tape unwinding motor 208 penetrates through the installation disk 203 and is connected to the tape winding disk 205;

[0055] Inside the inner cavity of the mounting shell 207, a transmission disc 214 is provided. Engaging teeth are provided on the outer side of the transmission disc 214. The inner side of the transmission disc 214 is connected to the outer side of the mounting disc 203. The thickness of the transmission disc 214 is greater than the thickness of the mounting disc 203. A guide rail 215 is installed on the inner side of the mounting shell 207. The guide rail 215 is slidably connected to the connection parts of the transmission disc 214 and the mounting disc 203.

[0056] On one side of the mounting frame 202, a driving motor 209 is installed. A driving gear 210 is sleeved on the output shaft of the driving motor 209. The driving gear 210 is located inside one end of the toothed belt 213 and is meshed and connected to the toothed belt 213. The other end of the toothed belt 213 is sleeved on the transmission disc 214 and is meshed and connected to the transmission disc 214. On one side of the mounting frame 202, a connecting frame 211 is installed. A tensioning pulley 212 is rotatably installed inside the connecting frame 211. The tensioning pulley 212 abuts against the outer side of the toothed belt 213.

[0057] On the other side of the mounting frame 202, a circulation pump 206 is installed. The output end of the circulation pump 206 is communicated to the water inlet 112 through a pipeline. The input end of the circulation pump 206 is communicated to the water storage tank 201 through a pipeline. The water storage tank 201 is communicated to the drain port 113 through a pipeline.

[0058] Two support columns 105 are symmetrically arranged on both sides of the top of the mounting shell 207. A support frame 107 is installed on the mounting frame 202. The support frame 107 is erected above the circulation pump 206. Embodiment

[0059] Please refer to Figure 1-6 As shown, this embodiment is a coaxial cable with stable phase, which is prepared by the following steps:

[0060] Step 1: Weigh 75 parts of high-density polyethylene, 5 parts of the insulating and heat-conducting filler from Embodiment 1, 1.5 parts of polyethylene wax, 2 parts of calcium stearate, 1.2 parts of dibutyl phthalate, 1 part of antioxidant 1010, and 1.5 parts of UV-P by weight, and set aside.

[0061] Step 2: Add the high-density polyethylene, insulating and heat-conducting filler, polyethylene wax, calcium stearate, dibutyl phthalate, antioxidant 1010, and UV-P into a mixer, and obtain a mixture after mixing evenly.

[0062] Step 3: Add the mixture into a twin-screw extruder for melting and extrusion, and obtain insulating and heat-conducting material after pelletizing by a pelletizer.

[0063] Step 4: Inject the insulating and heat-conducting material on the surface of the silver-plated copper wire to form a core wire, and then wrap 1 layer of aluminum foil on the core wire to obtain a metal conductor.

[0064] Step Five: Insert the end of the metal conductor into the wire threading hole 204 of the coaxial cable forming machine in Embodiment 3. Wind the end of the PTFE microporous tape on the take-up reel 205 around the metal conductor, then insert it into the wire threading cylinder 108, and then use the tractor to pull it forward;

[0065] Step Six: Start the drive motor 209. The operation of the drive motor 209 drives the driving gear 210 to rotate. Then, the driving gear 210 drives the transmission disk 214 to rotate on the guide rail 215 through the toothed belt 213, so that the take-up reel 205 rotates around the metal conductor. Start the unwind motor 208. The rotation of the unwind motor 208 drives the take-up reel 205 to rotate. During the rotation of the take-up reel 205, the PTFE microporous tape is continuously released and wound around the metal conductor;

[0066] Step Seven: Put the insulating and heat-conducting material into the feeding hopper 103. Start the extruder 102. The operating extruder 102 heats and shears the insulating and heat-conducting material that enters the extruder 102 through the feeding hopper 103 to form a molten material. The molten material enters the liquid storage chamber 109 through the discharge pipe 104 and flows from the liquid spraying hole 111 into the wire threading cylinder 108, and adheres to the metal conductor wound with the PTFE microporous tape. During the movement of the metal conductor in the wire threading cylinder 108, when passing through the inside of the cooling chamber 110, the molten material on the metal conductor is scraped and leveled due to the decrease in diameter. Then start the circulation pump 206. The operation of the circulation pump 206 transports the cooling water in the water storage tank 201 through the water inlet 112 to the cooling chamber 110, and then returns to the water storage tank 201 through the drain port 113 to form a circulating cooling water. The cooling water cools and shapes the molten material on the metal conductor, and then outputs from the end of the wire threading cylinder 108 to obtain the phase-stable coaxial cable;

[0067] Detect the performance of the phase-stable coaxial cable in Embodiment 4. The detection results are as follows: the insertion loss change rate is 16.5%, and the mechanical phase fluctuation range is less than 1.25°. Embodiment

[0068] Please refer to Figure 1-6 As shown, this embodiment is a phase-stable coaxial cable, which is prepared by the following steps:

[0069] Step One: Weigh 95 parts of high-density polyethylene, 25 parts of the insulating and heat-conducting filler from Embodiment 2, 2.5 parts of polyethylene wax, 4 parts of calcium stearate, 1.8 parts of dibutyl phthalate, 3 parts of antioxidant 1010, and 2.5 parts of UV-P by weight, and set aside;

[0070] Step 2: Add high-density polyethylene, insulating and heat-conducting filler, polyethylene wax, calcium stearate, dibutyl phthalate, antioxidant 1010, and UV-P into a mixer, and obtain a mixture after mixing evenly;

[0071] Step 3: Add the mixture into a twin-screw extruder for melt extrusion, and obtain insulating and heat-conducting material after pelletizing by a pelletizer;

[0072] Step 4: Inject the insulating and heat-conducting material onto the surface of a silver-plated copper wire to form a core wire, and then wrap 2 layers of aluminum foil around the core wire to obtain a metal conductor;

[0073] Step 5: Insert the end of the metal conductor into the wire threading hole 204 of the coaxial cable forming machine in Example 3, wind the end of the PTFE microporous tape on the take-up reel 205 around the metal conductor, then insert it into the wire threading cylinder 108, and then use a tractor to pull it forward;

[0074] Step 6: Start the driving motor 209, the operation of the driving motor 209 drives the driving gear 210 to rotate, and then the driving gear 210 drives the driving disk 214 to rotate on the guide rail 215 through the toothed belt 213, so that the take-up reel 205 rotates around the metal conductor. Start the unwind motor 208, the rotation of the unwind motor 208 drives the take-up reel 205 to rotate. During the rotation of the take-up reel 205, the PTFE microporous tape is continuously released and wound around the metal conductor;

[0075] Step 7: Put the insulating and heat-conducting material into the feeding hopper 103, start the extruder 102, and the operating extruder 102 heats and shears the insulating and heat-conducting material entering the extruder 102 through the feeding hopper 103 to form a molten material. The molten material enters the liquid storage chamber 109 through the discharge pipe 104 and flows from the liquid spraying hole 111 into the wire threading cylinder 108, and adheres to the metal conductor wound with the PTFE microporous tape. During the movement of the metal conductor in the wire threading cylinder 108, when passing through the inner side of the cooling chamber 110, the molten material on the metal conductor is scraped and leveled due to the decrease in diameter. Then start the circulation pump 206, and the operation of the circulation pump 206 transports the cooling water in the water storage tank 201 through the water inlet 112 to the cooling chamber 110, and then returns to the water storage tank 201 through the drain port 113 to form circulating cooling water. The cooling water cools and shapes the molten material on the metal conductor, and then outputs from the end of the wire threading cylinder 108 to obtain the phase-stable coaxial cable.

[0076] Detect the performance of the phase-stable coaxial cable in Example 5, and the detection results are as follows: the insertion loss change rate is 13.5%, and the mechanical phase fluctuation range is less than 1.05°.

[0077] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0078] The above content is only an illustration and description of the present invention. Those skilled in the art to which this technology belongs can make various modifications or supplements to the described specific embodiments or use similar ways to substitute them, as long as they do not deviate from the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. A production process of a phase-stable coaxial cable, characterized in that, The phase-stable coaxial cable is prepared by the following steps: Step 1: Weigh 75-95 parts of high-density polyethylene, 5-25 parts of insulating and heat-conducting filler, 1.5-2.5 parts of polyethylene wax, 2-4 parts of calcium stearate, 1.2-1.8 parts of dibutyl phthalate, 1-3 parts of antioxidant 1010, and 1.5-2.5 parts of UV-P by weight, and set aside; Step 2: Add high-density polyethylene, insulating and heat-conducting filler, polyethylene wax, calcium stearate, dibutyl phthalate, antioxidant 1010, and UV-P into a mixer, and obtain a mixed material after mixing evenly; Step 3: Add the mixed material into a twin-screw extruder for melt extrusion, and granulate it through a granulator to obtain insulating and heat-conducting material; Step 4: Inject the insulating and heat-conducting material onto the surface of a silver-plated copper wire to form a core wire, and then wrap 1-2 layers of aluminum foil around the core wire to obtain a metal conductor; Step 5: Insert the end of the metal conductor into the threading hole (204) of the coaxial cable forming machine, wind the end of the PTFE microporous tape on the take-up reel (205) around the metal conductor, then insert it into the threading cylinder (108), and then pull it forward by a tractor; Step 6: Start the drive motor (209), the drive motor (209) runs to drive the driving gear (210) to rotate, and then the driving gear (210) drives the driving disk (214) to rotate on the guide rail (215) through the toothed belt (213), so that the take-up reel (205) rotates around the metal conductor. Start the unwind motor (208), the unwind motor (208) rotates to drive the take-up reel (205) to rotate. During the rotation of the take-up reel (205), the PTFE microporous tape is continuously released and wound around the metal conductor; Step 7: Put the insulating and heat-conducting material into the feeding hopper (103), start the extruder (102), the running extruder (102) heats and shears the insulating and heat-conducting material entering the extruder (102) through the feeding hopper (103) to form a molten material. The molten material enters the liquid storage chamber (109) through the discharge pipe (in 104) and flows from the liquid spraying hole (111) into the threading cylinder (108), and adheres to the metal conductor wound with the PTFE microporous tape. During the movement of the metal conductor in the threading cylinder (108), when passing through the inner side of the cooling chamber (110), the molten material on the metal conductor is scraped and leveled due to the decrease in diameter. Then start the circulating pump (206), the circulating pump (206) runs to transport the cooling water in the water storage tank (201) through the water inlet (112) to the cooling chamber (110), and then returns to the water storage tank (201) through the water outlet (113) to form circulating cooling water. The cooling water cools and shapes the molten material on the metal conductor, and then outputs from the end of the threading cylinder (108) to obtain the phase-stable coaxial cable.

2. The production process of a coaxial cable with stable phase according to claim 1, characterized in that, The coaxial cable forming machine includes a winding mechanism and a forming mechanism; The shaping mechanism includes a mounting base (101) and an extruder (102). The extruder (102) is mounted on the top of the mounting base (101). A feeding hopper (103) is mounted on the top of the extruder (102). A discharge pipe (104) is mounted at the bottom of the output end of the extruder (102). The bottom end of the discharge pipe (104) is connected to one end of the top of the forming cylinder (106). Two support columns (105) are mounted at the bottom of the barrel of the extruder (102). The two support columns (105) are located on both sides of the discharge pipe (104). The forming cylinder (106) is mounted on a support frame (107). The winding mechanism includes a water storage tank (201) and a mounting frame (202). The mounting frame (202) is mounted on the top of the water storage tank (201). An installation shell (207) is mounted on the top of the mounting frame (202). An installation disk (203) is arranged inside the installation shell (207). A threading hole (204) is opened at the center of the installation disk (203). A tape take-up reel (205) is rotatably mounted on one side surface of the installation disk (203). A PTFE microporous tape is wound on the tape take-up reel (205). A tape unwinding motor (208) is arranged on the other side surface of the installation disk (203). The output shaft of the tape unwinding motor (208) penetrates through the installation disk (203) and is connected to the tape take-up reel (205).

3. A production process of a coaxial cable with stable phase according to claim 2, characterized in that, Liquid storage chambers (109) and cooling chambers (110) are respectively arranged at both ends of the inner wall of the forming cylinder (106). A threading cylinder (108) is arranged inside the forming cylinder (106). The liquid storage chamber (109) is communicated with the discharge pipe (104). A plurality of liquid spraying holes (111) are opened on the liquid storage chamber (109). All the plurality of liquid spraying holes (111) are communicated to the inner cavity of the threading cylinder (108). A water inlet (112) is opened at one end of the cooling chamber (110) away from the discharge pipe (104). A drain port (113) is opened at the top side of one end of the cooling chamber (110) close to the discharge pipe (104).

4. A production process of a coaxial cable with stable phase according to claim 3, characterized in that, One end of the threading cylinder (108) close to the liquid spraying holes (111) has a diameter larger than that of the end away from the liquid spraying holes (111).

5. A production process of a coaxial cable with stable phase according to claim 2, characterized in that, A transmission disk (214) is arranged in the inner cavity of the installation shell (207). Meshing teeth are arranged on the outside of the transmission disk (214). The inner side of the transmission disk (214) is connected to the outside of the installation disk (203). A guide rail (215) is mounted on the inner side of the installation shell (207). The connection part of the guide rail (215) with the transmission disk (214) and the installation disk (203) is slidably connected.

6. A production process of a coaxial cable with stable phase according to claim 5, characterized in that, The thickness of the transmission disk (214) is larger than that of the installation disk (203).

7. A production process of a coaxial cable with stable phase according to claim 2, characterized in that, A driving motor (209) is installed on one side of the mounting frame (202). A driving gear (210) is sleeved on the output shaft of the driving motor (209). The driving gear (210) is located inside one end of a toothed belt (213) and is meshed and connected with the toothed belt (213). The other end inside of the toothed belt (213) is sleeved on a transmission disc (214) and is meshed and connected with the transmission disc (214). A connecting frame (211) is installed on one side of the mounting frame (202). A tensioning wheel (212) is rotatably installed inside the connecting frame (211). The tensioning wheel (212) abuts against the outer side of the toothed belt (213).

8. A production process of a phase-stable coaxial cable according to claim 2, characterized in that, A circulation pump (206) is installed on the other side of the mounting frame (202). The output end of the circulation pump (206) is communicated with a water inlet (112) through a pipeline. The input end of the circulation pump (206) is communicated with a water storage tank (201) through a pipeline. The water storage tank (201) is communicated with a drain outlet (113) through a pipeline.

9. A production process of a coaxial cable with stable phase according to claim 2, characterized in that, The two support columns (105) are symmetrically arranged on both sides of the top of the mounting shell (207). A support frame (107) is installed on the mounting frame (202). The support frame (107) is erected above the circulation pump (206).

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