High-quality radio frequency coaxial cable and manufacturing device and manufacturing method thereof

Abstract

The invention belongs to the technical field of radio-frequency coaxial cables, and particularly relates to a high-quality radio-frequency coaxial cable and a manufacturing device and method thereof, the high-quality radio-frequency coaxial cable comprises an inner conductor, an insulating layer, a polyester belt layer, an outer conductor and a sheath layer which are sequentially sleeved from inside to outside, and the polyester belt layer is wrapped outside the insulating layer. Under the condition that the same raw materials are adopted, in the production process, an inner conductor, an insulating layer and an outer conductor are cleaned, impurities and metal are managed and controlled, the opportunity of entering the cable is reduced, the drying requirements of an insulating material and the insulating layer are increased, the insulating layer is wrapped with a polyester belt, and other improvement measures are taken, so that influence factors influencing standing waves, loss and intermodulation of a product are reduced; and the low standing wave, low loss and high intermodulation index of the high-quality radio frequency coaxial cable are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency coaxial cables, and in particular to a high-quality radio frequency coaxial cable and a manufacturing device and a manufacturing method thereof. Background Art

[0002] With the rapid development of 5G communication technology, the frequency and communication quality of mobile communications have reached unprecedented heights, and the quality and technology of RF coaxial cable products used for mobile communications are also constantly being updated and upgraded. The development of 5G communication technology has put forward higher requirements for RF coaxial cables, including low standing wave, low loss and high intermodulation indicators, in order to match with 5G communication equipment, ensure that RF signals can be transmitted stably over long distances, and avoid frequency interference between frequency bands of various operators in multi-input communication mode.

[0003] Unless there are special requirements, the third-order intermodulation index is not included in the general test items of RF coaxial cable finished products. Therefore, the factors affecting intermodulation performance are relatively less concerned during the production process. At the same time, there is still room for further optimization of standing wave and attenuation indicators.

[0004] During the production process, not many treatment measures have been taken for impurities and metal components that affect product performance. These impurities and metals remain in the RF coaxial cable along with the production process, thereby affecting the product's standing wave, loss and intermodulation performance. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problem that in the prior art, impurities and metals exist in the RF coaxial cable during the production process, which affects the standing wave, loss and intermodulation performance of the product, the present invention provides a high-quality RF coaxial cable and its manufacturing device and manufacturing method, which have low standing wave, low loss, and high intermodulation indicators that can meet 5G communication needs and are suitable for some high-demand communication occasions.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a high-quality radio frequency coaxial cable, which includes: an inner conductor, an insulating layer, a polyester tape layer, an outer conductor and a sheath layer which are sequentially sleeved from the inside to the outside, and the polyester tape layer is wrapped around the outside of the insulating layer.

[0007] Furthermore, the number of layers of the polyester tape layer is 1 to 2.

[0008] A manufacturing device is used to manufacture any one of the above-mentioned high-quality radio frequency coaxial cables, wherein: the manufacturing device comprises:

[0009] A cleaning mechanism, the cleaning mechanism is used to clean the inner conductor;

[0010] An extrusion mechanism, the extrusion mechanism is used to prepare an insulating layer outside the inner conductor;

[0011] A wrapping mechanism, the wrapping mechanism is used to wrap the polyester tape layer around the outside of the insulating layer;

[0012] A precision cutting mechanism, wherein the precision cutting mechanism is used for cutting the copper strip;

[0013] A longitudinal wrap welding mechanism, the longitudinal wrap welding mechanism is used to longitudinally weld the copper belt to the outside of the polyester belt layer;

[0014] A corrugating machine, the corrugating machine is used to corrugate the copper strip after longitudinal wrap welding to form the outer conductor;

[0015] A cleaning and drying mechanism is used to clean and dry the outer conductor.

[0016] Furthermore, the cleaning mechanism comprises:

[0017] Bracket 1, wherein the bracket 1 is provided with a motor, a lower roller, a pressure roller, a plurality of support columns and a plurality of ceramic ring seats, the plurality of ceramic ring seats are sequentially arranged on the bracket 1 along the working direction, the inner conductor passes through the plurality of ceramic ring seats sequentially, the plurality of support columns are distributed on both sides of the inner conductor, and each support column is rotatably connected with a ceramic guide wheel;

[0018] A wire-paying assembly, the wire-paying assembly comprising a wire drum, a wire-paying clamping plate, a wire-paying guide wheel and a guide wheel support, the wire drum is wound with cotton thread, the wire drum is mounted on the first bracket through the wire-paying clamping plate, and the wire-paying guide wheel is arranged on the first bracket through the guide wheel support;

[0019] Among them, the lower roller and the pressure roller cooperate with each other, and a gap is formed between the lower roller and the pressure roller for the cotton thread to pass through. The motor is used to drive the lower roller to rotate, thereby driving the pressure roller to passively rotate. One end of the cotton thread is pulled out from the bobbin and winds along the pay-off guide wheel before being wound around the outside of one end of the inner conductor. It then passes through multiple porcelain guide wheels in turn and is wound around the outside of the other end of the inner conductor, and finally passes through the gap between the pressure roller and the lower roller.

[0020] Furthermore, the precision cutting mechanism comprises:

[0021] Bracket two, on which a copper belt guide wheel, a first copper belt pressing plate, a fine-cutting knife seat and a second copper belt pressing plate are sequentially arranged along the working direction, the fine-cutting knife seat is used to cut the copper belt, and the first copper belt pressing plate and the second copper belt pressing plate are both provided with 2 to 3 layers of cotton cloth, and the copper belt passes through the copper belt guide wheel, the cotton cloth on the first copper belt pressing plate, the fine-cutting knife seat and the cotton cloth on the second copper belt pressing plate in sequence along the working direction.

[0022] Furthermore, the longitudinal wrapping welding mechanism includes: a bracket three, on which a first longitudinal wrapping mold, a second longitudinal wrapping mold, a welding mold and a sizing mold are sequentially arranged along the working direction, and the cable and copper tape wrapped with a polyester tape layer pass through the first longitudinal wrapping mold, the second longitudinal wrapping mold, the welding mold and the sizing mold in sequence, and the copper tape longitudinal wrap is arranged on the outside of the polyester tape layer.

[0023] Furthermore, the corrugating machine includes a chassis shell and a corrugating knife arranged in the chassis shell, and the corrugating knife is used to corrugate the copper strip after longitudinal wrapping and welding to form an outer conductor.

[0024] Furthermore, the cleaning and drying mechanism includes a water tank and two partition plates arranged in the water tank, the two partition plates divide the interior of the water tank into a first chamber, a second chamber and a third chamber, the first chamber, the second chamber and the third chamber are arranged in sequence along the working direction, the first chamber is used for cleaning the external conductor with a detergent, the second chamber is used for cleaning the external conductor with water mist, and the third chamber is used for drying the external conductor.

[0025] Furthermore, the first chamber, the second chamber and the third chamber are all provided with a conveying seat for guiding and conveying the external conductor, the first chamber is provided with a detergent nozzle for cleaning the external conductor with a detergent, the second chamber is provided with a water mist nozzle for cleaning the external conductor with water mist, and the third chamber is provided with an air blowing nozzle for drying the external conductor.

[0026] A manufacturing method, using a manufacturing device as described in any one of the above to manufacture a high-quality radio frequency coaxial cable, wherein the method comprises the following steps:

[0027] Step S1, cleaning the inner conductor,

[0028] After one end of the cotton thread is pulled out from the bobbin and goes around the pay-off guide wheel, it is wrapped 2 to 4 times around the outside of one end of the inner conductor to clean the dust and impurities on the surface of the inner conductor. Then it passes through multiple porcelain guide wheels in sequence, and at the same time, a detergent is dripped on the cotton thread. After that, it is wrapped 2 to 4 times around the outside of the other end of the inner conductor to remove oil and impurities on the surface of the inner conductor. Finally, it passes through the gap between the pressure roller and the lower roller. The motor is used to drive the lower roller to rotate, thereby driving the pressure roller to passively rotate, so as to provide traction for the cotton thread to travel.

[0029] Among them, the pay-off guide wheel, ceramic ring seat and ceramic guide wheel are cleaned regularly;

[0030] Step S2: manufacturing an insulating layer,

[0031] Step S21: Place the foamed insulating material in a sealed state into a drying hopper for drying to remove moisture from the foamed insulating material. The drying temperature range is set to 60° C. to 70° C.

[0032] Step S22, extruding the dried foamed insulating material obtained in step S21 onto the outside of the inner conductor cleaned in step S1 to form an insulating layer,

[0033] Step S23, placing the insulating layer obtained in step S22 into a cooling water tank for cooling.

[0034] Among them, cooling water is set in the cooling water tank, the cooling water uses pure water, and the cooling water is filtered three times. When the volume percentage of sediment in the cooling water tank is greater than 1%, it is cleaned and the cooling water is replaced.

[0035] Step S23, heating and drying the insulating layer after being cooled in step S23 through a constant temperature heating tube, wherein the drying temperature range is set to 40° C. to 50° C.;

[0036] Step S3: manufacturing a polyester belt layer,

[0037] Wrapping 1 to 2 layers of polyester tape around the insulating layer obtained in step S23 to form a polyester tape layer;

[0038] Step S4: manufacturing an outer conductor,

[0039] Step S41: After the copper belt comes out from the copper belt guide wheel, it passes through the cotton cloth on the first copper belt pressing plate, wherein 2 to 3 layers of cotton cloth are wrapped around the first copper belt pressing plate to remove oil stains and impurities on the surface of the copper belt.

[0040] Step S42: the copper strip after passing through the first copper strip pressing plate continues to move forward along the working direction and passes through the fine cutting knife holder, and the copper strip is finely cut by the fine cutting knife on the fine cutting knife holder.

[0041] Among them, the fine cutting knife seat is blown and cleaned once every 10 to 20 minutes, and the fine cutting knife is replaced after the length of the fine cutting copper strip is 50 to 300 km.

[0042] Step S43: the copper strip finely cut in step S42 continues to move forward and passes through the cotton cloth on the second copper strip pressing plate, wherein the second copper strip pressing plate is wrapped with 2 to 3 layers of cotton cloth to remove copper powder on the surface of the copper strip.

[0043] Step S44, the copper tape after passing through the second copper tape pressing plate continues to move forward along the working direction and passes through the first longitudinal wrapping mold and the second longitudinal wrapping mold in sequence, and at the same time, the polyester tape layer obtained in step S3 passes through the first longitudinal wrapping mold and the second longitudinal wrapping mold in sequence along the working direction, so as to longitudinally wrap the copper tape outside the polyester tape layer, and then the cable longitudinally wrapped with the copper tape passes through the welding mold and the sizing mold in sequence to weld the copper tape and determine the outer diameter of the copper tape after longitudinal wrapping.

[0044] Among them, regularly clean the welding mold,

[0045] Step S45, putting the cable longitudinally wrapped with copper tape obtained in step S44 into a corrugating machine for corrugation to obtain an outer conductor,

[0046] Among them, the corrugating machine should be cleaned regularly and the corrugating lubricant should be filtered at least three times;

[0047] Step S5: cleaning the outer conductor.

[0048] The outer conductor obtained in step S45 is placed in a water tank, and the surface of the outer conductor is cleaned by a detergent nozzle in the first chamber, and then the surface of the outer conductor is cleaned by a water mist nozzle in the second chamber, and finally the surface of the outer conductor is blown dry by an air blowing nozzle in the third chamber.

[0049] The cleaning liquid sprayed from the cleaning agent nozzle is made of clean water and a cleaning agent with a volume ratio of 5% to 10%, and a filter is arranged on the air blowing nozzle, and the filter is selected to have a filtration grade of two or more;

[0050] Step S6: manufacturing a sheath layer.

[0051] The specific technical effects are: under the condition of using the same raw materials, the inner conductor, insulation layer and outer conductor are cleaned during the production process, impurities and metals are controlled to reduce the chance of entering the cable, the drying requirements of insulating materials and insulation layers are increased, and improvement measures such as wrapping polyester tape around the outer surface of the insulation layer are taken to reduce the factors affecting the product's standing wave, loss and intermodulation; to ensure low standing wave, low loss and high intermodulation indicators of high-quality RF coaxial cables.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) The present invention cleans the surface of the inner conductor multiple times and the equipment parts in contact with the surface of the inner conductor, thereby reducing the loss caused by metal and impurities, and the influence of standing waves and intermodulation.

[0054] (2) The present invention performs a drying process on the foamed insulating material before extruding the foamed insulating material to reduce the dielectric loss of the cable.

[0055] (3) The present invention sets requirements on the cooling water quality in the cooling water tank after the insulation layer is formed by extrusion, cleans the cooling water tank of impurities and metals, and reduces the loss caused by metals and impurities, and the influence of standing waves and intermodulation.

[0056] (4) The present invention wraps the surface of the insulating layer with polyester tape to avoid defects in the insulating layer, loss, and standing wave effects when welding the longitudinally wrapped copper tape.

[0057] (5) In the process of preparing the outer conductor, the present invention cleans the copper strip comprehensively, removes the copper powder and impurities in the process of fine cutting, longitudinal wrapping, corrugation and cleaning, and reduces the standing wave and intermodulation effects caused by the metal and impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0059] Figure 1 It is a structural schematic diagram of a high-quality radio frequency coaxial cable of the present invention;

[0060] Figure 2 A flow chart of a method for manufacturing a high-quality radio frequency coaxial cable according to the present invention;

[0061] Figure 3 It is a structural schematic diagram of the cleaning mechanism of the present invention;

[0062] Figure 4 It is an assembly diagram of the precision cutting mechanism, longitudinal package welding mechanism, corrugating machine and cleaning and drying mechanism of the present invention;

[0063] Figure 5 It is a structural schematic diagram of the precision cutting mechanism and the longitudinal wrap welding mechanism of the present invention;

[0064] Figure 6 It is a structural schematic diagram of the corrugating machine of the present invention;

[0065] Figure 7 It is a schematic structural diagram of the cleaning and drying mechanism of the present invention.

[0066] In the figure: 1, cleaning mechanism; 101, bracket 1; 102, motor; 103, lower roller; 104, pressure roller; 105, support column; 106, porcelain ring seat; 107, porcelain guide wheel; 108, bobbin; 109, wire-releasing clamping plate; 110, wire-releasing guide wheel; 111, guide wheel pillar; 112, cotton thread; 113, pressure roller rod; 114, connecting rod; 115, detergent mounting seat; 116, roller bracket; 117, pressure roller shaft; 118, coupling; 119, motor bracket;

[0067] 2. Precision cutting mechanism; 201. Copper belt guide wheel; 202. First copper belt pressing plate; 203. Precision cutting knife seat; 204. Second copper belt pressing plate; 205. Cotton cloth; 206. Bracket 2;

[0068] 3. Longitudinal package welding mechanism; 301. Bracket three; 302. First longitudinal package mold; 303. Second longitudinal package mold; 304. Welding mold; 305. Sizing mold;

[0069] 4. Corrugating machine; 401. Case shell; 402. Corrugating knife;

[0070] 5. Cleaning and drying mechanism; 501. Water tank; 502. Partition plate; 503. First chamber; 504. Second chamber; 505. Third chamber; 506. Conveying seat; 507. Detergent nozzle; 508. Water mist nozzle; 509. Air blowing nozzle;

[0071] 6. Inner conductor; 7. Insulation layer; 8. Polyester tape layer; 9. Outer conductor; 10. Sheath layer. DETAILED DESCRIPTION

[0072] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0073] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0074] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] like Figure 1 As shown, it is the best embodiment of the present invention, a high-quality radio frequency coaxial cable, which includes: an inner conductor 6, an insulating layer 7, a polyester tape layer 8, an outer conductor 9 and a sheath layer 10 which are sequentially arranged from the inside to the outside, and the polyester tape layer 8 is wrapped around the outside of the insulating layer 7.

[0076] In this embodiment, the number of layers of the polyester tape layer 8 is 1 to 2.

[0077] like Figures 3 to 7 As shown, a manufacturing device is used to manufacture a high-quality radio frequency coaxial cable of any one of the above, wherein: the manufacturing device comprises:

[0078] A cleaning mechanism 1, the cleaning mechanism 1 is used to clean the inner conductor 6;

[0079] An extrusion mechanism, which is used to prepare an insulating layer 7 outside the inner conductor 6;

[0080] A wrapping mechanism, which is used to wrap the polyester tape layer 8 around the outside of the insulating layer 7;

[0081] Precision cutting mechanism 2, the precision cutting mechanism 2 is used for cutting the copper strip;

[0082] A longitudinal wrap welding mechanism 3, which is used to longitudinally weld the copper tape to the outside of the polyester tape layer 8;

[0083] A corrugator 4 is used to corrugate the copper strip after longitudinal welding to form an outer conductor 9;

[0084] The cleaning and drying mechanism 5 is used to clean and dry the outer conductor 9 .

[0085] In this embodiment, the cleaning mechanism 1 includes:

[0086] A bracket 101 is provided with a motor 102, a lower roller 103, a pressure roller 104, a plurality of support columns 105 and a plurality of ceramic ring seats 106. The plurality of ceramic ring seats 106 are sequentially arranged on the bracket 101 along the working direction. The inner conductor 6 passes through the plurality of ceramic ring seats 106 in sequence. The plurality of support columns 105 are distributed on both sides of the inner conductor 6. A ceramic guide wheel 107 is rotatably connected to each support column 105.

[0087] The wire-releasing assembly includes a wire drum 108, a wire-releasing clamping plate 109, a wire-releasing guide wheel 110 and a guide wheel support 111. Cotton thread 112 is wound around the wire drum 108. The wire drum 108 is mounted on a bracket 101 through the wire-releasing clamping plate 109. The wire-releasing guide wheel 110 is arranged on the bracket 101 through the guide wheel support 111.

[0088] Among them, the lower roller 103 and the pressure roller 104 cooperate with each other, and a gap is formed between the lower roller 103 and the pressure roller 104 for the cotton thread 112 to pass through. The motor 102 is used to drive the lower roller 103 to rotate, thereby driving the pressure roller 104 to passively rotate. One end of the cotton thread 112 is pulled out from the bobbin 108 and passes along the pay-off guide wheel 110 and then is wound around the outside of one end of the inner conductor 6. Then, it passes through multiple porcelain guide wheels 107 in turn and is wound around the outside of the other end of the inner conductor 6, and finally passes through the gap between the pressure roller 104 and the lower roller 103.

[0089] In this embodiment, the diameter of the cotton thread 112 is equal to 0.5 to 1.5 times the diameter of the inner conductor 6 .

[0090] In this embodiment, each ceramic ring seat 106 is provided with a wire inlet for the inner conductor 6 to pass through.

[0091] In this embodiment, a detergent mounting seat 115 for placing a detergent is provided on the bracket 101. The detergent mounting seat 115 is located in the middle of the inner conductor 6. The detergent can be made of a material that can remove oil stains and is volatile, environmentally friendly and pollution-free, such as alcohol.

[0092] In this embodiment, the motor 102 is installed on the bracket 101 through the motor bracket 119, the lower roller 103 is connected to the output shaft of the motor 102 through the coupling 118, the lower roller 103 is rotated to be set on the bracket 101 through the roller bracket 116, the pressure roller 104 is rotated to be installed on one end of the connecting rod 114 through the pressure roller shaft 117, and the other end of the connecting rod 114 is installed on the bracket 101 through the pressure roller rod 113.

[0093] Preferably, the lower roller 103 and the pressure roller 104 are provided with teeth that cooperate with each other, which is conducive to increasing friction, so that the motor 102 is used to drive the lower roller 103 to rotate, and then drive the pressure roller 104 to passively rotate to better provide traction for the cotton thread 112 to travel.

[0094] In this embodiment, the precision cutting mechanism 2 includes:

[0095] Bracket two 206, on bracket two 206, copper belt guide wheel 201, first copper belt pressing plate 202, fine cutting knife seat 203 and second copper belt pressing plate 204 are arranged in sequence along the working direction, the fine cutting knife seat 203 is used for cutting copper belt, the first copper belt pressing plate 202 and the second copper belt pressing plate 204 are both provided with 2 to 3 layers of cotton cloth 205, the copper belt passes through copper belt guide wheel 201, cotton cloth 205 on the first copper belt pressing plate 202, fine cutting knife seat 203 and cotton cloth 205 on the second copper belt pressing plate 204 in sequence along the working direction.

[0096] In this embodiment, the longitudinal wrapping welding mechanism 3 includes: a bracket three 301, on which the first longitudinal wrapping mold 302, the second longitudinal wrapping mold 303, the welding mold 304 and the sizing mold 305 are arranged in sequence along the working direction. The cable and the copper tape wrapped with the polyester tape layer 8 pass through the first longitudinal wrapping mold 302, the second longitudinal wrapping mold 303, the welding mold 304 and the sizing mold 305 in sequence, and the copper tape longitudinal wrap is arranged on the outside of the polyester tape layer 8.

[0097] In this embodiment, the corrugator 4 includes a chassis shell 401 and a corrugating knife 402 disposed in the chassis shell 401 . The corrugating knife 402 is used to corrugate the copper strip after longitudinal wrapping and welding to form an outer conductor 9 .

[0098] In this embodiment, the cleaning and drying mechanism 5 includes a water tank 501 and two partition plates 502 arranged in the water tank 501. The two partition plates 502 divide the interior of the water tank 501 into a first chamber 503, a second chamber 504 and a third chamber 505. The first chamber 503, the second chamber 504 and the third chamber 505 are arranged in sequence along the working direction. The first chamber 503 is used to clean the outer conductor 9 with a detergent, the second chamber 504 is used to clean the outer conductor 9 with water mist, and the third chamber 505 is used to dry the outer conductor 9.

[0099] In this embodiment, the first chamber 503, the second chamber 504 and the third chamber 505 are all provided with a conveying seat 506 for guiding and conveying the outer conductor 9, the first chamber 503 is provided with a detergent nozzle 507 for cleaning the outer conductor 9 with a detergent, the second chamber 504 is provided with a water mist nozzle 508 for cleaning the outer conductor 9 with water mist, and the third chamber 505 is provided with an air blowing nozzle 509 for drying the outer conductor 9.

[0100] like Figure 2 As shown, a manufacturing method, using a manufacturing device as any one of the above to manufacture a high-quality radio frequency coaxial cable, wherein the method comprises the following steps:

[0101] Step S1, cleaning the inner conductor 6,

[0102] One end of the cotton thread 112 is pulled out from the bobbin 108 and goes around the pay-off guide wheel 110, and then is wound around the outside of one end of the inner conductor 6 for 2 to 4 turns to clean the dust and other impurities on the surface of the inner conductor 6, and then passes through multiple porcelain guide wheels 107 in sequence, while the detergent is dripped on the cotton thread 112, and then is wound around the outside of the other end of the inner conductor 6 for 2 to 4 turns to remove the oil and impurities on the surface of the inner conductor 6, and finally passes through the gap between the pressure roller 104 and the lower roller 103, and the motor 102 is used to drive the lower roller 103 to rotate, thereby driving the pressure roller 104 to passively rotate, so as to provide traction for the cotton thread 112 to travel.

[0103] The pay-off guide wheel 110, the ceramic ring seat 106 and the ceramic guide wheel 107 are cleaned regularly to prevent the impurities and metals on the guide wheel and metal parts in contact with the inner conductor 6 from adhering to the surface of the inner conductor 6 and affecting the performance, and the wearing parts are replaced regularly;

[0104] Step S2: manufacturing an insulating layer 7,

[0105] Step S21: Place the foamed insulating material in a drying hopper (not shown) in a sealed state for drying to remove moisture from the foamed insulating material. The drying temperature range is set to 60° C. to 70° C., thereby reducing the cable dielectric loss.

[0106] Step S22, extruding the dried foamed insulating material obtained in step S21 onto the outside of the inner conductor 6 cleaned in step S1 to form an insulating layer 7,

[0107] Step S23, placing the insulating layer 7 obtained in step S22 into a cooling water tank (not shown in the figure) for cooling.

[0108] Among them, cooling water is set in the cooling water tank, and the cooling water uses pure water. The cooling water is filtered in three stages. When the volume ratio of the sediment in the cooling water tank is greater than 1%, it is cleaned and the cooling water is replaced, thereby preventing metal objects and impurities in the cooling water from adhering to the surface of the insulating layer 7 and affecting the performance.

[0109] Step S23, heating and drying the insulating layer 7 after cooling in step S23 through a constant temperature heating tube (not shown in the figure), wherein the drying temperature range is set to 40° C. to 50° C., thereby reducing the cable dielectric loss;

[0110] In the process of manufacturing the insulating layer 7, the cable is guided and transported by the guide wheel and the traction belt, and the guide wheel and the traction belt (not shown in the figure) are regularly cleaned with alcohol or a cleaning agent;

[0111] Step S3: manufacturing the polyester belt layer 8,

[0112] The insulating layer 7 obtained in step S23 is wrapped with 1 to 2 layers of polyester tape to form a polyester tape layer 8, which is then rolled onto a reel (not shown in the figure), thereby isolating the heat of the copper tape during welding, thereby avoiding defects in the insulating layer 7 when welding the longitudinally wrapped copper tape, causing losses and standing wave effects;

[0113] Step S4: manufacturing the outer conductor 9,

[0114] Step S41: After the copper belt comes out from the copper belt guide wheel 201, it passes through the cotton cloth 205 on the first copper belt pressing plate 202. The first copper belt pressing plate 202 is wrapped with 2 to 3 layers of cotton cloth 205 to remove oil stains and impurities on the surface of the copper belt.

[0115] Step S42: the copper strip after passing through the first copper strip pressing plate 202 continues to move forward along the working direction and passes through the fine cutting knife holder 203, and the copper strip is finely cut by the fine cutting knife on the fine cutting knife holder 203.

[0116] The fine cutting knife holder 203 is cleaned by blowing air once every 10 to 20 minutes, and the fine cutting knife is replaced after the length of the fine cutting copper strip is 50 to 300 km, so as to prevent the copper powder of the fine cutting knife holder 203 from being brought into the outer conductor 9 and affecting the performance.

[0117] Step S43: the copper strip finely cut in step S42 continues to move forward and passes through the cotton cloth 205 on the second copper strip pressing plate 204, wherein the second copper strip pressing plate 204 is wrapped with 2 to 3 layers of cotton cloth 205 for removing copper powder on the surface of the copper strip.

[0118] Step S44, the copper tape after passing through the second copper tape pressing plate continues to move forward along the working direction and passes through the first longitudinal wrapping mold 302 and the second longitudinal wrapping mold 303 in sequence. At the same time, the polyester tape layer 8 obtained in step S3 passes through the first longitudinal wrapping mold 302 and the second longitudinal wrapping mold 303 in sequence along the working direction to longitudinally wrap the copper tape outside the polyester tape layer 8. Then, the cable longitudinally wrapped with the copper tape passes through the welding mold 304 and the sizing mold 305 in sequence to weld the copper tape and determine the outer diameter of the copper tape after longitudinal wrapping.

[0119] Among them, the welding mold 304 is cleaned regularly, and the cleaning frequency is once every 10 minutes to 20 minutes. Since the welding mold 304 is always in a drawing state, a lot of copper powder is generated. Clean and check the wear and tear of the welding mold 304 equipment parts every week, thereby preventing the copper powder on the surface of the longitudinal package mold and the welding mold 304 from being brought into the outer conductor 9 to affect the performance.

[0120] Step S45: Place the cable longitudinally wrapped with copper tape obtained in step S44 into a corrugating machine 4 for corrugation to obtain an outer conductor 9.

[0121] Among them, since the blade of the corrugating machine 4 moves at high speed in contact with the surface of the outer conductor 9, a lot of copper powder is generated. The corrugating machine 4 is cleaned regularly, and the corrugating lubricating fluid is filtered at more than three levels to reduce the copper powder caused by the wear of the corrugating blade 402 and the outer conductor 9;

[0122] Step S5: cleaning the outer conductor 9,

[0123] The outer conductor 9 obtained in step S45 is placed in a water tank 501, and the surface of the outer conductor 9 is cleaned by a detergent nozzle 507 in a first chamber 503, and then the surface of the outer conductor 9 is cleaned by a water mist nozzle 508 in a second chamber 504, and finally the surface of the outer conductor 9 is blown dry by an air blow nozzle 509 in a third chamber 505.

[0124] The cleaning liquid sprayed from the cleaning agent nozzle 507 is a cleaning agent with a volume ratio of 5% to 10% of clean water, and a filter is provided on the air blowing nozzle 509. The filter is a filter with a filtration level of two or more. Thus, the copper strip is fully cleaned, and the copper powder and impurities in the process of fine cutting, longitudinal packaging, corrugation, and cleaning are cleaned, and the standing wave and intermodulation effects caused by metal and impurities are reduced.

[0125] Step S6, manufacturing the sheath layer 10. Before extruding the sheath layer 10, all equipment parts in contact with the cable are cleaned with alcohol or a detergent to prevent the surface of the outer conductor 9 from being contaminated and affecting the performance.

[0126] In this embodiment, after the sheath layer 10 is manufactured, the entire RF coaxial cable is manufactured, and the cable performance is tested using a connector. The connector used in the test is made of silver-plated copper (or ternary alloy material) and is replaced regularly to prevent worn metal from falling into the cable and affecting product quality.

[0127] The specific technical effects are: under the condition of using the same raw materials, the inner conductor 6, the insulating layer 7 and the outer conductor 9 are cleaned during the production process, impurities and metals are controlled to reduce the chance of entering the cable, the drying requirements of the insulating material and the insulating layer 7 are increased, and improvement measures such as wrapping the insulating layer 7 with polyester tape are taken to reduce the factors affecting the standing wave, loss and intermodulation of the product; and ensure the low standing wave, low loss and high intermodulation indicators of high-quality RF coaxial cables.

[0128] Compared with the prior art, the present invention has the following beneficial effects:

[0129] (1) The present invention cleans the surface of the inner conductor 6 multiple times and cleans the equipment parts in contact with the surface of the inner conductor 6, thereby reducing the loss caused by metal and impurities, and the influence of standing waves and intermodulation.

[0130] (2) The present invention performs a drying process on the foamed insulating material before extruding the foamed insulating material to reduce the dielectric loss of the cable.

[0131] (3) The present invention sets requirements on the cooling water quality in the cooling water tank after the insulating layer 7 is formed by extrusion, and cleans the cooling water tank of impurities and metals to reduce the loss caused by metals and impurities, and the influence of standing waves and intermodulation.

[0132] (4) The present invention wraps the surface of the insulating layer 7 with polyester tape to avoid defects in the insulating layer 7 when welding the longitudinally wrapped copper tape, thereby avoiding losses and standing wave effects.

[0133] (5) In the process of preparing the outer conductor 9, the present invention cleans the copper strip comprehensively, removes the copper powder and impurities in the process of fine cutting, longitudinal wrapping, corrugation and cleaning, and reduces the standing waves and intermodulation effects caused by the metal and impurities.

[0134] The above description is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-quality radio frequency coaxial cable, characterized in that: include: An inner conductor (6), an insulating layer (7), a polyester tape layer (8), an outer conductor (9) and a sheath layer (10) are sequentially sleeved from the inside to the outside, wherein the polyester tape layer (8) is wrapped around the outside of the insulating layer (7).

2. A high-quality radio frequency coaxial cable as claimed in claim 1, characterized in that: The number of layers of the polyester tape layer (8) is 1 to 2.

3. A manufacturing device for manufacturing a high-quality radio frequency coaxial cable as claimed in any one of claims 1 to 2, characterized in that: The manufacturing device comprises: A cleaning mechanism (1), the cleaning mechanism (1) being used for cleaning an inner conductor (6); An extrusion mechanism, the extrusion mechanism being used to prepare an insulating layer (7) outside the inner conductor (6); A wrapping mechanism, the wrapping mechanism being used to wrap the polyester tape layer (8) around the outside of the insulating layer (7); A precision cutting mechanism (2), wherein the precision cutting mechanism (2) is used for cutting the copper strip; A longitudinal wrapping welding mechanism (3), the longitudinal wrapping welding mechanism (3) being used to longitudinally wrap and weld the copper belt to the outside of the polyester belt layer (8); A corrugating machine (4), the corrugating machine (4) being used to corrugate the copper strip after longitudinal wrap welding to form the outer conductor (9); A cleaning and drying mechanism (5), wherein the cleaning and drying mechanism (5) is used to clean and dry the outer conductor (9).

4. A manufacturing device as claimed in claim 3, characterized in that: The cleaning mechanism (1) comprises: A bracket (101), wherein the bracket (101) is provided with a motor (102), a lower roller (103), a pressure roller (104), a plurality of support columns (105) and a plurality of ceramic ring seats (106); the plurality of ceramic ring seats (106) are sequentially arranged on the bracket (101) along a working direction; the inner conductor (6) passes through the plurality of ceramic ring seats (106) in sequence; the plurality of support columns (105) are distributed on both sides of the inner conductor (6); and each support column (105) is rotatably connected to a ceramic guide wheel (107); A wire-paying assembly, the wire-paying assembly comprising a wire drum (108), a wire-paying clamping plate (109), a wire-paying guide wheel (110) and a guide wheel support column (111); the wire drum (108) is wound with cotton thread (112); the wire drum (108) is mounted on the first bracket (101) via the wire-paying clamping plate (109); and the wire-paying guide wheel (110) is arranged on the first bracket (101) via the guide wheel support column (111); The lower roller (103) and the pressure roller (104) cooperate with each other, and a gap is formed between the lower roller (103) and the pressure roller (104) for the cotton thread (112) to pass through. The motor (102) is used to drive the lower roller (103) to rotate, thereby driving the pressure roller (104) to passively rotate. One end of the cotton thread (112) is pulled out from the bobbin (108) and passes along the pay-off guide wheel (110) before being wound around the outside of one end of the inner conductor (6), and then passes through a plurality of porcelain guide wheels (107) in sequence before being wound around the outside of the other end of the inner conductor (6), and finally passes through the gap between the pressure roller (104) and the lower roller (103).

5. A manufacturing device as claimed in claim 3, characterized in that: The precision cutting mechanism (2) comprises: Bracket 2 (206), wherein a copper belt guide wheel (201), a first copper belt pressing plate (202), a fine cutting knife seat (203) and a second copper belt pressing plate (204) are sequentially arranged on the bracket 2 (206) along the working direction, wherein the fine cutting knife seat (203) is used for cutting the copper belt, and 2 to 3 layers of cotton cloth (205) are arranged on the first copper belt pressing plate (202) and the second copper belt pressing plate (204), and the copper belt passes through the copper belt guide wheel (201), the cotton cloth (205) on the first copper belt pressing plate (202), the fine cutting knife seat (203) and the cotton cloth (205) on the second copper belt pressing plate (204) in sequence along the working direction.

6. A manufacturing device as claimed in claim 5, characterized in that: The longitudinal wrapping welding mechanism (3) comprises: a bracket three (301), on which a first longitudinal wrapping mold (302), a second longitudinal wrapping mold (303), a welding mold (304) and a sizing mold (305) are arranged in sequence along the working direction; the cable and the copper tape wrapped with the polyester tape layer (8) pass through the first longitudinal wrapping mold (302), the second longitudinal wrapping mold (303), the welding mold (304) and the sizing mold (305) in sequence; and the copper tape longitudinal wrapping is arranged outside the polyester tape layer (8).

7. A manufacturing device according to claim 6, characterized in that: The corrugating machine (4) comprises a chassis shell (401) and a corrugating knife (402) arranged in the chassis shell (401), wherein the corrugating knife (402) is used to corrugate the copper strip after longitudinal wrapping and welding to form an outer conductor (9).

8. A manufacturing device according to claim 7, characterized in that: The cleaning and drying mechanism (5) comprises a water tank (501) and two partition plates (502) arranged in the water tank (501), wherein the two partition plates (502) divide the interior of the water tank (501) into a first chamber (503), a second chamber (504) and a third chamber (505), wherein the first chamber (503), the second chamber (504) and the third chamber (505) are arranged in sequence along a working direction, wherein the first chamber (503) is used for cleaning the outer conductor (9) with a detergent, the second chamber (504) is used for cleaning the outer conductor (9) with a water mist, and the third chamber (505) is used for drying the outer conductor (9).

9. A manufacturing device according to claim 8, characterized in that: The first chamber (503), the second chamber (504) and the third chamber (505) are all provided with a conveying seat (506) for guiding and conveying the outer conductor (9); the first chamber (503) is provided with a detergent nozzle (507) for cleaning the outer conductor (9) with a detergent; the second chamber (504) is provided with a water mist nozzle (508) for cleaning the outer conductor (9) with a water mist; and the third chamber (505) is provided with an air blowing nozzle (509) for drying the outer conductor (9).

10. A manufacturing method, using a manufacturing device as described in any one of claims 3 to 9 to manufacture a high-quality radio frequency coaxial cable as described in any one of claims 1 to 2, characterized in that: The steps include: Step S1, cleaning the inner conductor (6), One end of the cotton thread (112) is pulled out from the bobbin (108) and passes along the pay-off guide wheel (110), and then is wrapped around the outside of one end of the inner conductor (6) for 2 to 4 turns to clean the dust and impurities on the surface of the inner conductor (6). Then, the cotton thread (112) passes through a plurality of porcelain guide wheels (107) in sequence, and at the same time, a detergent is dripped on the cotton thread (112). Then, the cotton thread (112) is wrapped around the outside of the other end of the inner conductor (6) for 2 to 4 turns to remove the oil and impurities on the surface of the inner conductor (6). Finally, the cotton thread passes through the gap between the pressure roller (104) and the lower roller (103). The motor (102) is used to drive the lower roller (103) to rotate, thereby driving the pressure roller (104) to passively rotate, so as to provide traction for the cotton thread (112) to travel. Wherein, the pay-off guide wheel (110), the ceramic ring seat (106) and the ceramic guide wheel (107) are cleaned regularly; Step S2: manufacturing an insulating layer (7), Step S21: Place the foamed insulating material in a sealed state into a drying hopper for drying to remove moisture from the foamed insulating material. The drying temperature range is set to 60° C. to 70° C. Step S22, extruding the dried foamed insulating material obtained in step S21 onto the outside of the inner conductor (6) cleaned in step S1 to form an insulating layer (7), Step S23, placing the insulating layer (7) obtained in step S22 into a cooling water tank for cooling. Among them, cooling water is set in the cooling water tank, the cooling water uses pure water, and the cooling water is filtered three times. When the volume percentage of sediment in the cooling water tank is greater than 1%, it is cleaned and the cooling water is replaced. Step S23, heating and drying the insulating layer (7) after being cooled in step S23 through a constant temperature heating tube, wherein the drying temperature range is set to 40° C. to 50° C.; Step S3, manufacturing a polyester belt layer (8), The insulating layer (7) obtained in step S23 is wrapped with 1 to 2 layers of polyester tape to form a polyester tape layer (8); Step S4: manufacturing an outer conductor (9), Step S41: After the copper belt comes out from the copper belt guide wheel (201), it passes through the cotton cloth (205) on the first copper belt pressing plate (202), wherein the first copper belt pressing plate (202) is wrapped with 2 to 3 layers of cotton cloth (205) for removing oil stains and impurities on the surface of the copper belt. Step S42: the copper strip after passing through the first copper strip pressing plate (202) continues to move forward along the working direction and passes through the fine cutting knife holder (203), and the copper strip is finely cut by the fine cutting knife on the fine cutting knife holder (203). The fine cutting knife seat (203) is cleaned by blowing air once every 10 to 20 minutes, and the fine cutting knife is replaced after the length of the fine cutting copper strip reaches 50 to 300 km. Step S43: the copper strip finely cut in step S42 continues to move forward and passes through the cotton cloth (205) on the second copper strip pressing plate (204), wherein the second copper strip pressing plate (204) is wrapped with 2 to 3 layers of cotton cloth (205) for removing copper powder on the surface of the copper strip. Step S44, the copper tape after passing through the second copper tape pressing plate (204) continues to move forward along the working direction and passes through the first longitudinal wrapping mold (302) and the second longitudinal wrapping mold (303) in sequence, and at the same time, the polyester tape layer (8) obtained in step S3 passes through the first longitudinal wrapping mold (302) and the second longitudinal wrapping mold (303) in sequence along the working direction, so as to longitudinally wrap the copper tape outside the polyester tape layer (8), and then the cable longitudinally wrapped with the copper tape passes through the welding mold (304) and the sizing mold (305) in sequence, so as to weld the copper tape and determine the outer diameter of the copper tape after longitudinal wrapping. Among them, the welding mold (304) is cleaned regularly. Step S45, placing the cable longitudinally wrapped with copper tape obtained in step S44 into a corrugating machine (4) for corrugation to obtain an outer conductor (9), Among them, the corrugating machine (4) is cleaned regularly, and the corrugating lubricating fluid is filtered at least three times; Step S5, cleaning the outer conductor (9), The outer conductor (9) obtained in step S45 is placed in a water tank (501), and the surface of the outer conductor (9) is cleaned in a first chamber (503) by a detergent nozzle (507), and then the surface of the outer conductor (9) is cleaned in a second chamber (504) by a water mist nozzle (508), and finally the surface of the outer conductor (9) is blown dry in a third chamber (505) by an air blow nozzle (509). The cleaning liquid sprayed from the detergent nozzle (507) is a mixed solution of clean water and 5% to 10% detergent, and a filter is provided on the air-blowing nozzle (509), and the filter is a filter with a filtration level of two or more. Step S6: manufacturing a sheath layer (10).

Images