Device and method for manufacturing high-temperature special cable

Abstract

The invention discloses a device and a method for manufacturing a high-temperature special cable, belongs to the technical field of cables, and aims to solve the problem that high temperature resistance and impact resistance of an existing special cable are difficult to meet at the same time. Through the cable core, the mineral mica layer, the cross-linked insulating layer, the ceramic fireproof layer and the flame-retardant sheath, the mineral mica layer is installed on the periphery of the cable core, it is ensured that the cable core has good high-temperature resistance and fireproof performance, meanwhile, the cross-linked insulating layer is installed on the periphery of the mineral mica layer, the overall heat resistance is further improved, and finally the flame-retardant sheath is arranged, so that the flame-retardant performance of the cable is improved. The flame-retardant sheath is prepared by mixing low-smoke halogen-free flame-retardant polyolefin, wollastonite powder and polytetrafluoroethylene micro powder, the wollastonite powder has higher heat resistance and enhancement effect, so that the overall mechanical strength and high-temperature resistance can be improved, and the polytetrafluoroethylene micro powder has excellent high-temperature resistance and self-lubricating performance, so that the flame-retardant sheath has excellent flame-retardant performance. The friction coefficient of the whole body at high temperature can be reduced, and the anti-aging and wear-resisting properties are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly relates to a manufacturing device and method for high-temperature special cables. Background Art

[0002] Special cables refer to cable products with special properties, structures or functions, suitable for specific environments or special application scenarios. Compared with ordinary cables, special cables can meet the safe and reliable transmission requirements under extreme conditions such as high temperature, high pressure, corrosion, and strong electromagnetic interference through material innovation, structural design or process optimization.

[0003] In the Chinese patent with the publication number CN116959803A, a cable and a cable manufacturing method are proposed. The cable manufacturing method includes the following steps: processing an insulator to make the upper surface of the insulator reach a first height; laying a first wire core group on the upper surface of the insulator, wherein the first wire core group includes a plurality of first wire cores; processing the insulator to make the upper surface of the insulator reach a second height, and the insulator covers the first wire core group, wherein the second height is greater than the first height; laying a second wire core group on the upper surface of the insulator, the second wire core group includes a plurality of first wire cores, and the plurality of first wire cores of the second wire core group are arranged at intervals in the width direction of the insulator; processing the insulator to make the upper surface of the insulator reach a third height, and the insulator covers the first wire core group, and the third height is greater than the second height. The cable manufacturing method can integrate multiple wire harnesses together and can also ensure that multiple core wires are in their respective positions and the relative positions are stable; However, in the prior art, the manufactured special cables have poor high-temperature resistance. Moreover, during the manufacturing process of special cables, due to the weak interfacial bonding between wollastonite and polyolefin and easy agglomeration, the overall mechanical properties decline. Although the overall high-temperature resistance is improved, the overall impact resistance decreases accordingly, the service life is shortened, and the cost is relatively high.

[0004] Therefore, we propose a high-temperature special cable and its manufacturing method. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-temperature special cable and its manufacturing method, which solves the problem that it is difficult to simultaneously meet the high-temperature resistance and impact resistance of current special cables in the background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A manufacturing method for a high-temperature special cable, comprising the following steps: S1: Prepare a wire core: Stranding multiple copper wires into a metal conductor wire core, and wrapping an insulating material around the outer periphery of the metal conductor wire core; S2: Wrapping the mineral mica layer: Use a wrapping machine to tightly wrap the mineral mica tape around the outer circumference of the conductor. During the wrapping process, control the wrapping tension and lapping rate to ensure the integrity and continuity of the mineral mica layer; S3: Extruding the cross-linked insulation layer: Add the cross-linked polyethylene raw material to the cable manufacturing device, melt and extrude the cross-linked polyethylene through the cable manufacturing device, and make the melted cross-linked polyethylene cover the outer circumference of the conductor through the extrusion die head; S4: Adding the flame-retardant filling layer: During the stranding process, fill the voids of the conductor with the flame-retardant polypropylene material to ensure the roundness and stability of the cable. Pay attention to the uniformity and density of the filling during filling to avoid voids and cracks; S5: Coating the ceramifiable fireproof layer: Use the cable manufacturing device to extrude the ceramifiable silicone rubber, and use the extrusion die head to coat the ceramifiable silicone rubber on the outer circumference of the conductor filled with the flame-retardant filling layer; S6: Extruding the flame-retardant sheath: Add the low-smoke and halogen-free flame-retardant polyolefin material and the mixture in proportion to the cable manufacturing device, extrude the low-smoke and halogen-free flame-retardant polyolefin material and the mixture through the cable manufacturing device, and then use the extrusion die head to coat it on the outer circumference of the ceramifiable fireproof layer.

[0007] Furthermore, a mineral mica layer is wrapped on the outer surface of the core, a cross-linked insulation layer is coated on the outer surface of the mineral mica layer, a flame-retardant filling layer is filled on the outer surface of the cross-linked insulation layer, a ceramifiable fireproof layer is coated on the outer surface of the flame-retardant filling layer, and a flame-retardant sheath is coated on the outer surface of the ceramifiable fireproof layer.

[0008] Furthermore, the cross-linked insulation layer is cross-linked polyethylene, the flame-retardant filling layer is flame-retardant polypropylene, the ceramifiable fireproof layer is ceramifiable silicone rubber, and the flame-retardant sheath is made of a mixture of low-smoke and halogen-free flame-retardant polyolefin, wollastonite powder and polytetrafluoroethylene micropowder.

[0009] Furthermore, in S6, the mixture is a mixture of wollastonite powder and polytetrafluoroethylene micropowder, and the ratio of the low-smoke and halogen-free flame-retardant polyolefin, wollastonite powder and polytetrafluoroethylene micropowder is 20:7:1. When preparing the wollastonite powder, first pre-coat the wollastonite with a silane coupling agent.

[0010] Another technical solution proposed by the present invention: Provide a manufacturing device for high-temperature special cables. The cable manufacturing device includes a machine table, an extrusion component arranged at the upper end of the machine table, and a feeding component arranged at the upper end of the extrusion component. An installation table is arranged on one side of the machine table, a chassis is arranged at the upper end of the installation table, a base is arranged on one side of the installation table, a main motor is arranged at the upper end of the base, a transmission component is arranged on one side of the main motor, the main motor is connected to a gear transmission group arranged inside the chassis through the transmission component, and one end of the gear transmission group is connected to the extrusion component.

[0011] Further, the transmission component includes a driving wheel A arranged at the output end of the main motor, a transmission belt sleeved on the outer surface of the driving wheel A, and a driving wheel B arranged on the outer surface of the transmission belt. A transmission rod is arranged at the central position of the driving wheel B. One end of the transmission rod is connected to the gear transmission group. A linkage rod is arranged on the outer surface of the gear transmission group. One end of the linkage rod is provided with an extrusion screw, and the extrusion screw is located inside the extrusion component.

[0012] Further, the extrusion component includes a side shield A and a side shield B arranged at the upper end of the machine table. The side shield A and the side shield B are oppositely arranged. An extrusion sleeve is arranged between the side shield A and the side shield B. The extrusion screw is arranged inside the extrusion sleeve. An electric heating component is arranged on the outer surface of the extrusion sleeve. The electric heating component is externally connected to a power supply. A feeding port is opened on the outer surface of one end of the extrusion sleeve, and the feeding port is connected to the feeding component.

[0013] Further, a small blower is arranged at the lower end of the electric heating component. A small motor is arranged on one side of the small blower. The output end of the small motor is connected to the rotating shaft of the small blower. The electric heating component includes a heat transfer cylinder sleeved on the outer surface of the extrusion sleeve, an installation box arranged at the lower end of the heat transfer cylinder, and electric heating plates arranged inside the installation box and the heat transfer cylinder. One side of the installation box is communicated with the air outlet of the small blower, and the other side of the installation box is communicated with the heat transfer cylinder.

[0014] Further, the feeding component includes a feeding hopper arranged on the outer surface of the extrusion sleeve, an observation window arranged on one side of the feeding hopper, and a discharge pipe arranged on the outer surface of the feeding hopper. A weighing component is also arranged on the outer surface of the feeding hopper. The weighing component includes a storage box arranged on the outer surface of the feeding hopper. The storage box is communicated with the feeding hopper. A storage bin is opened inside the storage box. An electric push rod is arranged inside the storage bin. One end of the electric push rod is provided with a bearing plate. A weighing unit is embedded on the upper surface of the bearing plate. An inclined scraper is arranged on the inner wall of the storage bin. One end of the inclined scraper is in contact with the upper surface of the bearing plate. A cavity is opened inside the inner wall of the storage box. A push plate and a plug pipe are arranged inside the cavity. One end of the push plate is inserted into the plug pipe. A magnetic plate is embedded on the lower bottom surface of the bearing plate. The magnetic plate is magnetically connected to the push plate. One end of the plug pipe is provided with a bent pipe. One end of the bent pipe extends into the inclined scraper. An inclined spray pipe is arranged on the outer surface of the inclined scraper. A branch pipe is arranged inside the inclined scraper. A one-way valve A is arranged inside the branch pipe. The inclined spray pipe is communicated with the bent pipe through the branch pipe. One end of the inclined scraper is provided with a rubber cover. One end of the bent pipe corresponds to the rubber cover. A one-way valve B is arranged inside the end of the bent pipe close to the rubber cover.

[0015] Further, an extrusion plate is arranged at one end of the extrusion sleeve. A connecting groove is opened on the outer surface of the extrusion plate. The extrusion plate is connected to the extrusion sleeve through the connecting groove. An extrusion hole is opened at the center of the extrusion plate. An external connecting pipe is arranged on one side of the extrusion plate. The external connecting pipe corresponds to the extrusion hole.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: A manufacturing device and method for a high-temperature special cable proposed by the present invention, through a wire core, a mineral mica layer, a cross-linked insulation layer, a ceramized fireproof layer, and a flame-retardant sheath. A mineral mica layer is installed around the wire core to ensure that the wire core has good high-temperature resistance and fireproof performance. At the same time, a cross-linked insulation layer is installed around the mineral mica layer to further improve the overall heat resistance. In addition, a ceramized fireproof layer is also provided to further improve the overall fireproof performance. Finally, a flame-retardant sheath is provided, and the flame-retardant sheath is made of a mixture of low-smoke and halogen-free flame-retardant polyolefin, wollastonite powder, and polytetrafluoroethylene micropowder. Because wollastonite powder has high heat resistance and an enhancing effect, it can improve the overall mechanical strength and high-temperature resistance. Polytetrafluoroethylene micropowder has excellent high-temperature resistance and self-lubricating performance, which can reduce the overall friction coefficient at high temperatures and improve its anti-aging and wear resistance. In addition, when preparing wollastonite powder, wollastonite is first pre-coated with a silane coupling agent to improve the interfacial compatibility between wollastonite powder and polytetrafluoroethylene, so that when the overall high-temperature resistance is improved, the overall impact resistance can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a special cable in the manufacturing device and method for a high-temperature special cable of the present invention; Figure 2 It is a manufacturing flow chart of a special cable in the manufacturing device and method for a high-temperature special cable of the present invention; Figure 3 It is a schematic diagram of the overall structure of the manufacturing device and method for a high-temperature special cable of the present invention Figure 1 ; Figure 4 It is a schematic diagram of the overall structure of the manufacturing device and method for a high-temperature special cable of the present invention Figure 2 ; Figure 5 It is a schematic diagram of the structure of an extrusion component in the manufacturing device and method for a high-temperature special cable of the present invention Figure 1 ; Figure 6 It is a schematic diagram of the structure of an extrusion component in the manufacturing device and method for a high-temperature special cable of the present invention Figure 2 ; Figure 7 It is a schematic diagram of the structure of an extrusion component in the manufacturing device and method for a high-temperature special cable of the present invention Figure 3 ; Figure 8 It is a schematic diagram of the structure of a weighing component in the manufacturing device and method for a high-temperature special cable of the present invention; Figure 9 It is in the manufacturing device and method for a high-temperature special cable of the present invention Figure 8 Enlarged view of part A; Figure 10Schematic structural diagram of the electric heating component in the manufacturing device and method of the high-temperature special cable of the present invention.

[0018] In the figure: 1. Machine table; 11. Core; 12. Mineral mica layer; 13. Crosslinked insulation layer; 14. Flame-retardant filling layer; 15. Ceramicized fireproof layer; 16. Flame-retardant sheath; 2. Extrusion component; 21. Side shield A; 22. Side shield B; 23. Extrusion sleeve; 24. Feeding port; 25. Electric heating component; 251. Heat transfer cylinder; 252. Installation box; 253. Electric heating plate; 26. Pressure gauge; 27. Small fan; 28. Small motor; 29. Thermometer; 210. Extrusion plate; 211. Connection groove; 212. Extrusion hole; 213. Outer connecting pipe; 3. Feeding component; 31. Feeding hopper; 32. Observation window; 33. Discharge pipe; 4. Installation table; 41. Chassis; 42. Gear transmission group; 43. Linking rod; 5. Base; 6. Main motor; 7. Transmission component; 71. Driving wheel A; 72. Driving wheel B; 73. Transmission belt; 74. Transmission rod; 8. Weighing component; 81. Storage box; 82. Storage bin; 83. Bearing plate; 831. Magnetic plate; 84. Weighing unit; 85. Inclined scraper; 851. Inclined spray pipe; 852. Branch pipe; 853. Check valve A; 854. Rubber cover; 855. Check valve B; 86. Pusher plate; 87. Plug pipe; 88. Elbow pipe; 89. Controller; 9. Extrusion screw. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0020] To solve the technical problem of how to improve the high-temperature resistance and impact resistance of special cables, as Figure 1 and Figure 2 shown, the following preferred technical solutions are provided: A high-temperature special cable includes a core 11, a mineral mica layer 12 wrapped on the outer surface of the core 11, and a crosslinked insulation layer 13 coated on the outer surface of the mineral mica layer 12. The outer surface of the crosslinked insulation layer 13 is filled with a flame-retardant filling layer 14. A ceramicized fireproof layer 15 is coated on the outer surface of the flame-retardant filling layer 14, and a flame-retardant sheath 16 is coated on the outer surface of the ceramicized fireproof layer 15.

[0021] The crosslinked insulation layer 13 is crosslinked polyethylene, the flame-retardant filling layer 14 is flame-retardant polypropylene, the ceramicized fireproof layer 15 is ceramicized silicone rubber, and the flame-retardant sheath 16 is made of a mixture of low-smoke, halogen-free flame-retardant polyolefin, wollastonite powder, and polytetrafluoroethylene micropowder.

[0022] Among them, a manufacturing method of a high-temperature special cable includes the following steps: S1: Prepare the core: Strands of copper wires are twisted into a metal conductor core 11, and an insulating material is wrapped around the outer periphery of the metal conductor core 11; S2: Wrap the mineral mica layer 12: Use a wrapping machine to tightly wrap the mineral mica tape around the outer periphery of the conductor. During the wrapping process, control the wrapping tension and lapping rate well to ensure the integrity and continuity of the mineral mica layer 12; S3: Extrude the cross-linked insulation layer 13: Add the cross-linked polyethylene raw material to the cable manufacturing device, melt and extrude the cross-linked polyethylene through the cable manufacturing device, and make the melted cross-linked polyethylene cover the outer periphery of the conductor through an extrusion die head; S4: Add the flame-retardant filling layer 14: During the cabling process, fill the voids of the conductor with the flame-retardant polypropylene material to ensure the roundness and stability of the cable. Pay attention to the uniformity and density of the filling during filling to avoid voids and gaps; S5: Coating the ceramifiable fireproof layer 15: Extrude the ceramifiable silicone rubber using the cable manufacturing device, and use the extrusion die head to coat the ceramifiable silicone rubber on the outer periphery of the conductor filled with the flame-retardant filling layer 14; S6: Extrude the flame-retardant sheath 16: Add the low-smoke halogen-free flame-retardant polyolefin material and the mixture in proportion to the cable manufacturing device, extrude the low-smoke halogen-free flame-retardant polyolefin material and the mixture through the cable manufacturing device, and then use the extrusion die head to coat it on the outer periphery of the ceramifiable fireproof layer 15.

[0023] In S6, the mixture is a mixture of wollastonite powder and polytetrafluoroethylene micropowder, and the ratio of the low-smoke halogen-free flame-retardant polyolefin, wollastonite powder, and polytetrafluoroethylene micropowder is 20:7:1. When preparing the wollastonite powder, the wollastonite is pre-coated with a silane coupling agent first.

[0024] Specifically, a mineral mica layer 12 is installed around the wire core 11 to ensure that the wire core 11 has good high-temperature resistance and fire resistance. At the same time, a cross-linked insulation layer 13 is installed around the mineral mica layer 12 to further improve the overall heat resistance. In addition, a ceramifiable fireproof layer 15 is provided to further enhance the overall fireproof performance. Finally, a flame-retardant sheath 16 is provided, and the flame-retardant sheath 16 is made of a mixture of low-smoke and halogen-free flame-retardant polyolefin, wollastonite powder, and polytetrafluoroethylene micro-powder. Since wollastonite powder has high heat resistance and an enhancing effect, it can improve the overall mechanical strength and high-temperature resistance. Polytetrafluoroethylene micro-powder has excellent high-temperature resistance and self-lubricating properties, which can reduce the friction coefficient of the whole at high temperatures and improve its anti-aging and wear resistance. In addition, when preparing wollastonite powder, wollastonite is pre-coated with a silane coupling agent to improve the interfacial compatibility between wollastonite powder and polytetrafluoroethylene, so that when the overall high-temperature resistance is improved, the overall impact resistance can also be improved; In addition, wollastonite is pre-coated with a silane coupling agent such as KH-550 with a dosage of 1%-2% to improve the interfacial compatibility. Wollastonite with D50 = 5-8μm is selected to form a gradient filling with PTFE micro-powder with D50 = 2-5μm to reduce voids.

[0025] To solve the technical problem of how to further improve the high-temperature resistance of special cables, as Figures 3 - 10 shown, the following preferred technical solutions are provided: A manufacturing device for a high-temperature special cable, the cable manufacturing device includes a machine table 1, an extrusion component 2 arranged at the upper end of the machine table 1, and a feeding component 3 arranged at the upper end of the extrusion component 2. An installation table 4 is arranged on one side of the machine table 1, a chassis 41 is arranged at the upper end of the installation table 4, a base 5 is arranged on one side of the installation table 4, a main motor 6 is arranged at the upper end of the base 5, a transmission component 7 is arranged on one side of the main motor 6, the main motor 6 is connected to a gear transmission group 42 arranged inside the chassis 41 through the transmission component 7, and one end of the gear transmission group 42 is connected to the extrusion component 2. The low-smoke and halogen-free flame-retardant polyolefin material and the mixture are put into the feeding component 3 and enter the extrusion component 2 through the feeding component 3. The main motor 6 is started, the output end of the main motor 6 drives the transmission component 7 to rotate, and then drives the gear transmission group 42 to rotate. The gear transmission group 42 will cause the extrusion component 2 to start working, so as to heat and melt the low-smoke and halogen-free flame-retardant polyolefin material and the mixture and extrude them to the extrusion die head, and pass the conductor through the extrusion die head to complete the coating.

[0026] The transmission component 7 includes a driving wheel A71 provided at the output end of the main motor 6, a transmission belt 73 sleeved on the outer surface of the driving wheel A71, and a driving wheel B72 provided on the outer surface of the transmission belt 73. A transmission rod 74 is provided at the central position of the driving wheel B72. One end of the transmission rod 74 is connected to the gear transmission group 42. A linkage rod 43 is provided on the outer surface of the gear transmission group 42. One end of the linkage rod 43 is provided with an extrusion screw 9. The extrusion screw 9 is located inside the extrusion component 2. When the main motor 6 is started, its output end will drive the driving wheel A71 to rotate, and the driving wheel A71 will in turn cause the transmission belt 73 to rotate, thereby causing the driving wheel B72 to rotate. The rotation of the driving wheel B72 will cause the transmission rod 74 to rotate, thereby driving the gear transmission group 42 to operate, and finally causing the linkage rod 43 to drive the extrusion screw 9 to rotate, thereby completing the extrusion of the low-smoke, halogen-free, flame-retardant polyolefin material and the mixture.

[0027] The extrusion component 2 includes a side shield A21 and a side shield B22 provided at the upper end of the machine table 1. The side shield A21 and the side shield B22 are oppositely arranged. An extrusion sleeve 23 is provided between the side shield A21 and the side shield B22. The extrusion screw 9 is arranged inside the extrusion sleeve 23. An electric heating component 25 is provided on the outer surface of the extrusion sleeve 23. The electric heating component 25 is externally connected to a power source. A material inlet 24 is opened on the outer surface of one end of the extrusion sleeve 23. The material inlet 24 is connected to the feeding component 3. After the low-smoke, halogen-free, flame-retardant polyolefin material and the mixture are put into the feeding component 3, they will enter the inside of the extrusion sleeve 23 along the material inlet 24. At the same time, during the working process, while the extrusion screw 9 is continuously rotating, the electric heating component 25 is turned on, so that the temperature inside the extrusion sleeve 23 rises, and the heating and melting of the low-smoke, halogen-free, flame-retardant polyolefin material and the mixture are completed.

[0028] A small fan 27 is provided at the lower end of the electric heating assembly 25. A small motor 28 is provided on one side of the small fan 27. The output end of the small motor 28 is connected to the rotating shaft of the small fan 27. The electric heating assembly 25 includes a heat transfer cylinder 251 sleeved on the outer surface of the extrusion sleeve 23, a mounting box 252 provided at the lower end of the heat transfer cylinder 251, and electric heating plates 253 provided inside the mounting box 252 and the heat transfer cylinder 251. One side of the mounting box 252 is communicated with the air outlet of the small fan 27, and the other side of the mounting box 252 is communicated with the heat transfer cylinder 251. When the electric heating plates 253 are turned on, the heat generated by them will gradually spread into the heat transfer cylinder 251. Through the heat transfer effect, the heat will cause the temperature inside the extrusion sleeve 23 to rise, so as to realize the heating and melting of the low-smoke and halogen-free flame-retardant polyolefin material and the mixture inside it. At the same time, during the heating process, the small fan 27 is turned on to make it blow out air flow, so as to evenly and quickly distribute the heat generated by the electric heating plates 253 into the heat transfer cylinder 251, improving the heating quality. In addition, a pressure gauge 26 and a thermometer 29 are installed on the outer surface of the extrusion sleeve 23 to monitor the pressure and temperature inside the extrusion sleeve 23.

[0029] The feeding component 3 includes a feeding hopper 31 arranged on the outer surface of the extrusion sleeve 23, an observation window 32 arranged on one side of the feeding hopper 31, and a discharge pipe 33 arranged on the outer surface of the feeding hopper 31. A weighing assembly 8 is also arranged on the outer surface of the feeding hopper 31. The weighing assembly 8 includes a storage box 81 arranged on the outer surface of the feeding hopper 31. The storage box 81 is communicated with the feeding hopper 31. A storage bin 82 is opened inside the storage box 81. An electric push rod is arranged inside the storage bin 82. One end of the electric push rod is provided with a bearing plate 83. A weighing unit 84 is embedded on the upper surface of the bearing plate 83. An inclined scraper 85 is arranged on the inner wall of the storage bin 82. One end of the inclined scraper 85 is in contact with the upper surface of the bearing plate 83. A cavity is opened inside the inner wall of the storage box 81. A push plate 86 and a plug tube 87 are arranged inside the cavity. One end of the push plate 86 is inserted into the plug tube 87. A magnetic plate 831 is embedded on the lower bottom surface of the bearing plate 83. The magnetic plate 831 is magnetically connected with the push plate 86. One end of the plug tube 87 is provided with a bent tube 88. One end of the bent tube 88 extends into the inclined scraper 85. An inclined spray pipe 851 is arranged on the outer surface of the inclined scraper 85. A branch pipe 852 is arranged inside the inclined scraper 85. A one-way valve A853 is arranged inside the branch pipe 852. The inclined spray pipe 851 is communicated with the bent tube 88 through the branch pipe 852. One end of the inclined scraper 85 is provided with a rubber cover 854. One end of the bent tube 88 corresponds to the rubber cover 854. A one-way valve B855 is arranged inside one end of the bent tube 88 close to the rubber cover 854. During the feeding process, the electric push rod is used to make one end of the bearing plate 83 contact with the inner wall of the feeding hopper 31. The material to be put in is placed on the bearing plate 83, and the weighing unit 84 is used for weighing. The material with the required weight is weighed out. At the same time, the weighed data will be presented on a controller 89 installed at the upper end of the storage box 81. After the weighing is completed, the electric push rod is used to make the bearing plate 83 retract into the storage bin 82. During the retraction process, the material on the bearing plate 83 will be scraped by the inclined scraper 85 into the extrusion sleeve 23. At the same time, the magnetic plate 831 will drive the push plate 86 to move together, so that one end of the push plate 86 continuously compresses the air inside the plug tube 87, and squeezes these gases into the bent tube 88 and sprays out from the inclined spray pipe 851 to promote the discharge of materials. After the discharge of materials is completed, the bearing plate 83 extends out again. At this time, the push plate 86 will pump the gas inside the plug tube 87, so that the air pressure inside the bent tube 88 is reduced, and the rubber cover 854 is deformed, so that the material sticking to the surface of the rubber cover 854 falls off, so as to realize the precise utilization of materials. It should be noted that the one-way valve A853 can only discharge air, and the one-way valve B855 can only intake air.

[0030] One end of the extrusion sleeve 23 is provided with an extrusion plate 210. A connecting groove 211 is formed on the outer surface of the extrusion plate 210. The extrusion plate 210 is connected to the extrusion sleeve 23 through the connecting groove 211. An extrusion hole 212 is formed at the center of the extrusion plate 210. An external connecting pipe 213 is arranged on one side of the extrusion plate 210. The external connecting pipe 213 corresponds to the extrusion hole 212. As the extrusion screw 9 rotates continuously, the material in the extrusion sleeve 23 continuously moves towards the extrusion plate 210. The material in the extrusion sleeve 23 will come out from the extrusion hole 212, and then the melted material is injected into the extrusion die head through a pipeline to complete the coating with the conductor.

[0031] Specifically, when producing the flame-retardant sheath 16, it is necessary to weigh the low-smoke and halogen-free flame-retardant polyolefin material and the mixture in detail to determine the ratio. The material to be weighed is placed into the feeding hopper 31. The weighed material will fall onto the bearing plate 83 and is weighed by the weighing unit 84. The required weight of the material is weighed, and the weighing data is displayed on the controller 89. After weighing, the electric push rod is used to retract the bearing plate 83 into the storage bin 82. During the retraction process, the material on the bearing plate 83 will be scraped into the extrusion sleeve 23 by the inclined scraper 85. At the same time, the magnetic plate 831 will move together with the push plate 86, so that one end of the push plate 86 continuously compresses the air inside the plug tube 87 and squeezes these gases into the elbow 88 and sprays out from the inclined spray pipe 851 to promote the discharge of materials. After the discharge of materials is completed, the bearing plate 83 extends again. At this time, the push plate 86 will pump the gas in the plug tube 87, so that the air pressure in the elbow 88 decreases, which causes the rubber cover 854 to deform, and the material adhering to the surface of the rubber cover 854 falls off, so as to realize the precise utilization of materials. On the one hand, it prevents the material from sticking to the inclined scraper 85, improves the weighing accuracy of the material, and indirectly improves the mixing ratio of the material. When the mixing ratio of the material can be more accurate, the quality of the produced flame-retardant sheath 16 is higher and the high-temperature resistance performance is better. On the other hand, it can also prevent material waste and reduce production costs.

[0032] It should be noted that in the above embodiments, the extrusion die head is an indispensable production device in the cable production coating process and belongs to the prior art, so no more description will be given here.

[0033] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A manufacturing method of a high-temperature special cable, characterized in that, It includes the following steps: S1: Prepare the core: Strands of copper wires are twisted into a metallic conductor core (11), and an insulating material is wrapped around the outer periphery of the metallic conductor core (11). S2: Wrap the mineral mica layer (12): Use a wrapping machine to tightly wrap the mineral mica tape around the outer periphery of the conductor. During the wrapping process, control the wrapping tension and overlap rate to ensure the integrity and continuity of the mineral mica layer (12). S3: Extrude the cross-linked insulation layer (13): Add the cross-linked polyethylene raw material into the cable manufacturing device. Melt and extrude the cross-linked polyethylene through the cable manufacturing device, and make the melted cross-linked polyethylene cover the outer periphery of the conductor through an extrusion die head. S4: Add the flame-retardant filling layer (14): During the cabling process, fill the flame-retardant polypropylene material into the voids of the conductor to ensure the roundness and stability of the cable. Pay attention to the uniformity and density of the filling during filling to avoid voids and gaps. S5: Coat the ceramifiable fireproof layer (15): Use the cable manufacturing device to extrude the ceramifiable silicone rubber, and use the extrusion die head to coat the ceramifiable silicone rubber on the outer periphery of the conductor filled with the flame-retardant filling layer (14). S6: Extrude the flame-retardant sheath (16): Add the low-smoke and halogen-free flame-retardant polyolefin material and the mixture into the cable manufacturing device in proportion. Extrude the low-smoke and halogen-free flame-retardant polyolefin material and the mixture through the cable manufacturing device, and then use the extrusion die head to coat it on the outer periphery of the ceramifiable fireproof layer (15).

2. The manufacturing method of the high-temperature special cable as described in claim 1, characterized in that: A mineral mica layer (12) is wrapped on the outer surface of the core (11), a cross-linked insulation layer (13) is coated on the outer surface of the mineral mica layer (12), a flame-retardant filling layer (14) is filled on the outer surface of the cross-linked insulation layer (13), a ceramifiable fireproof layer (15) is coated on the outer surface of the flame-retardant filling layer (14), and a flame-retardant sheath (16) is coated on the outer surface of the ceramifiable fireproof layer (15).

3. The manufacturing method of the high-temperature special cable according to claim 1, characterized in that: The cross-linked insulation layer (13) is cross-linked polyethylene, the flame-retardant filling layer (14) is flame-retardant polypropylene, the ceramifiable fireproof layer (15) is ceramifiable silicone rubber, and the flame-retardant sheath (16) is made of a mixture of low-smoke and halogen-free flame-retardant polyolefin, wollastonite powder, and polytetrafluoroethylene micropowder.

4. The manufacturing method of the high-temperature special cable according to claim 1, wherein: In S6, the mixture is a mixture of wollastonite powder and polytetrafluoroethylene micropowder, and the ratio of low-smoke and halogen-free flame-retardant polyolefin, wollastonite powder, and polytetrafluoroethylene micropowder is 20:7:

1. When preparing the wollastonite powder, first pre-coat the wollastonite with a silane coupling agent.

5. A manufacturing device for a high-temperature special cable, which is applied to the manufacturing method of the high-temperature special cable as described in claim 1, is characterized in that, The cable manufacturing device includes a machine table (1), an extrusion component (2) arranged at the upper end of the machine table (1), and a feeding component (3) arranged at the upper end of the extrusion component (2). An installation table (4) is arranged on one side of the machine table (1), a chassis (41) is arranged at the upper end of the installation table (4), a base (5) is arranged on one side of the installation table (4), a main motor (6) is arranged at the upper end of the base (5), a transmission component (7) is arranged on one side of the main motor (6), the main motor (6) is connected to a gear transmission group (42) arranged inside the chassis (41) through the transmission component (7), and one end of the gear transmission group (42) is connected to the extrusion component (2).

6. The manufacturing apparatus of the high-temperature special cable as claimed in claim 5, wherein: The transmission component (7) includes a driving pulley A (71) arranged at the output end of the main motor (6), a transmission belt (73) sleeved on the outer surface of the driving pulley A (71), and a driving pulley B (72) arranged on the outer surface of the transmission belt (73). A transmission rod (74) is arranged at the central position of the driving pulley B (72). One end of the transmission rod (74) is connected to the gear transmission group (42). A linkage rod (43) is arranged on the outer surface of the gear transmission group (42). One end of the linkage rod (43) is provided with an extrusion screw (9), and the extrusion screw (9) is located inside the extrusion component (2).

7. The manufacturing apparatus of the high-temperature special cable according to claim 6, characterized in that: The extrusion component (2) includes a side guard A (21) and a side guard B (22) arranged at the upper end of the machine table (1). The side guard A (21) and the side guard B (22) are arranged oppositely. An extrusion sleeve (23) is arranged between the side guard A (21) and the side guard B (22). The extrusion screw (9) is arranged inside the extrusion sleeve (23). An electric heating component (25) is arranged on the outer surface of the extrusion sleeve (23). The electric heating component (25) is externally connected to a power source. A material discharge port (24) is formed on the outer surface of one end of the extrusion sleeve (23), and the material discharge port (24) is connected to the feeding component (3).

8. The manufacturing apparatus of the high-temperature special cable according to claim 7, characterized in that: A small fan (27) is arranged at the lower end of the electric heating component (25). A small motor (28) is arranged on one side of the small fan (27). The output end of the small motor (28) is connected to the rotating shaft of the small fan (27). The electric heating component (25) includes a heat transfer cylinder (251) sleeved on the outer surface of the extrusion sleeve (23), an installation box (252) arranged at the lower end of the heat transfer cylinder (251), and electric heating plates (253) arranged inside the installation box (252) and the heat transfer cylinder (251). One side of the installation box (252) is communicated with the air outlet of the small fan (27), and the other side of the installation box (252) is communicated with the heat transfer cylinder (251).

9. The manufacturing apparatus of the high-temperature special cable according to claim 8, characterized in that: The feeding component (3) includes a feeding hopper (31) arranged on the outer surface of the extrusion sleeve (23), an observation window (32) arranged on one side of the feeding hopper (31), and a discharge pipe (33) arranged on the outer surface of the feeding hopper (31). A weighing assembly (8) is also arranged on the outer surface of the feeding hopper (31). The weighing assembly (8) includes a storage box (81) arranged on the outer surface of the feeding hopper (31). The storage box (81) is communicated with the feeding hopper (31). A storage bin (82) is opened inside the storage box (81). An electric push rod is arranged inside the storage bin (82). One end of the electric push rod is provided with a bearing plate (83). A weighing unit (84) is embedded on the upper surface of the bearing plate (83). An inclined scraper (85) is arranged on the inner wall of the storage bin (82). One end of the inclined scraper (85) is in contact with the upper surface of the bearing plate (83). A cavity is opened inside the inner wall of the storage box (81). A push plate (86) and a plug tube (87) are arranged inside the cavity. One end of the push plate (86) is inserted into the plug tube (87). A magnetic plate (831) is embedded on the lower bottom surface of the bearing plate (83). The magnetic plate (831) is magnetically connected with the push plate (86). One end of the plug tube (87) is provided with a bent tube (88). One end of the bent tube (88) extends into the inclined scraper (85). An inclined spray pipe (851) is arranged on the outer surface of the inclined scraper (85). A branch pipe (852) is arranged inside the inclined scraper (85). A one-way valve A (853) is arranged inside the branch pipe (852). The inclined spray pipe (851) is communicated with the bent tube (88) through the branch pipe (852). One end of the inclined scraper (85) is provided with a rubber cover (854). One end of the bent tube (88) corresponds to the rubber cover (854). A one-way valve B (855) is arranged inside the end of the bent tube (88) close to the rubber cover (854).

10. The manufacturing apparatus of the high-temperature special cable according to claim 9, characterized in that: One end of the extrusion sleeve (23) is provided with an extrusion plate (210). A connecting groove (211) is opened on the outer surface of the extrusion plate (210). The extrusion plate (210) is connected with the extrusion sleeve (23) through the connecting groove (211). An extrusion hole (212) is opened at the center of the extrusion plate (210). An external connecting pipe (213) is arranged on one side of the extrusion plate (210). The external connecting pipe (213) corresponds to the extrusion hole (212).

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