Halogen-free flame-retardant fireproof cable and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant fireproof cable and a preparation method thereof, and relates to the technical field of fireproof cables, the halogen-free flame-retardant fireproof cable comprises a barrier mechanism, the barrier mechanism sleeves the outer surface of a polyethylene pipe, and a gap is formed between the inner side surface of the barrier mechanism and the outer surface of the polyethylene pipe; the blocking mechanism is used for blocking uniform gaps in the surfaces of the polyethylene pipes, and the framework mechanism is used for limiting and centering the multiple polyethylene pipes and supporting and forming a cooling air flow channel. According to the halogen-free flame-retardant fireproof cable and the preparation method thereof, the sealing cavities are formed among the protection assembly, the shell and the heat conduction pipe, when the copper stranded wires are combusted, the influence among the multiple copper stranded wires is reduced due to blocking of the shell, meanwhile, combustion flames are not prone to spreading due to the sealing cavities evenly formed in the surface of the polyethylene pipe, and the flame-retardant performance of the cable is improved. The structure is used for replacing halogen flame retardants, and the problem that a large amount of smoke and toxic gas are generated when the halogen flame retardants are combusted, and the amount of the smoke and toxic gas is increased along with the increase of the combustion temperature is solved.

Description

Technical Field

[0001] The invention relates to the technical field of fireproof cables, in particular to a halogen-free flame-retardant fireproof cable and a preparation method thereof. Background Art

[0002] The insulation wire in the cable is tightly attached to the sheath, which is not conducive to the heat dissipation of the cable. When a fire occurs, the insulation wire will burn in a very short time. Therefore, the flame retardant and fireproof effect is not very ideal. In addition to expecting improvements in flame retardant materials, the industry also hopes to make reasonable improvements in the structure to make the flame retardant performance of the cable better. The flame retardant layer of the traditional cable generally adopts a single flame retardant material. The flame retardant is a halogen flame retardant. When burned, a large amount of smoke and toxic gases are generated, and the amount increases with the increase of the combustion temperature. Therefore, it can only be used for low-temperature flame retardancy. The halogen-free flame retardant used in recent years has less smoke and low toxicity, but contains a large amount of hydrated substances. When the temperature is high, the hydrated substances inside the cable will undergo a dehydration reaction, thereby reducing the physical and mechanical properties of the cable, so the flame retardant temperature cannot be high. The Chinese patent announcement number is: CN113707383A discloses "A halogen-free, low-smoke, flame-retardant, environmentally friendly fireproof cable". In this patent, the cable can be bent at adjacent fireproof monomers, and the cable can be rolled up for easy transportation. When there is no fire, the heat of the cable core can be dissipated to the outside through the gaps between adjacent arc-shaped fireproof sheets. When a fire occurs, the temperature outside the cable rises, and the heat expansion rod expands when it encounters heat, causing multiple arc-shaped fireproof sheets 7 to move synchronously toward the cable core and squeeze the belt body until the adjacent ends of the multiple arc-shaped fireproof sheets contact each other.

[0003] Existing halogen-free flame-retardant fireproof cables and their preparation methods have the problem that, due to structural design defects, a large amount of smoke and toxic gases are generated when halogen flame retardants burn, and the amount increases with the increase of combustion temperature. In addition, the high temperature of the conductive core under high voltage can easily cause the cable to burn. Summary of the invention

[0004] The present invention provides a halogen-free flame-retardant fireproof cable and a preparation method thereof, which solves the problems mentioned in the above background technology.

[0005] To achieve the above object, the present invention is implemented by the following technical scheme: a halogen-free flame retardant fireproof cable, comprising a copper stranded wire, the surface of the copper stranded wire is coated with a polyethylene tube to form a conductive wire core, the number of the conductive wire core is set to be multiple, and further comprising: A blocking mechanism, wherein the blocking mechanism is sleeved on the outer surface of the polyethylene tube, a gap is provided between the inner side surface of the blocking mechanism and the outer surface of the polyethylene tube, and the blocking mechanism is used to block the uniform gap on the surface of the polyethylene tube; A skeleton mechanism, the skeleton mechanism is fixedly mounted on the outer surface of the barrier mechanism, the skeleton mechanism is used for limiting the position and centering of a plurality of polyethylene tubes and supporting and forming the cooling air flow channel, and a heat shrink tube is fixedly connected to the outer surface of the skeleton mechanism; A protection component, which is fixedly mounted on the surface of the barrier mechanism near the edge, and is used for isolating and protecting the polyethylene pipe from the outside world and for sealing the cooling air flow channel; A cooling mechanism, which is fixedly mounted on the inner side of the protective assembly and is used for introducing and discharging gas inside the air flow channel; The blocking mechanism includes a shell, the end face of which is fixedly connected to a heat-conducting pipe, a gap is arranged between the inner side of the heat-conducting pipe and the outer surface of the polyethylene tube, and a thermal conductive coating is poured inside the gap. When used under high pressure, the copper stranded wire is easily overheated, causing the polyethylene tube and the outer protective structure to burn. In this device, multiple copper stranded wires and polyethylene tubes are separated and arranged, and multiple shells are sleeved on the outer surface of the polyethylene tube. The multiple shells are evenly spaced, and the polyethylene tube is blocked and protected from the outside by a protective component. The polyethylene tube passes through the heat-conducting pipe, and the heat-conducting pipe blocks and protects the polyethylene tube to prevent the polyethylene tube from moving and wearing on the inner side of the shell.

[0006] Preferably, the blocking mechanism further comprises a sphere, which is rotatably mounted on the outer surface of the shell, and a curved plate is fixedly connected to a position of the shell surface close to the sphere, and a limiting hole is provided on the surface of the curved plate.

[0007] Preferably, there are two arc-shaped plates, the surface of the sphere is rotatably connected to the inner side surface of the arc-shaped plate, a heat pipe is fixedly connected to the end surface of the shell, and an internal threaded hole is opened on the surface of the shell near the edge.

[0008] Preferably, the skeleton structure includes a plastic shell, which is fixedly mounted on the outer surface of the heat-conducting tube, an inner circular hole is opened in the middle of the surface of the plastic shell, and a through hole is opened near the edge of the surface of the plastic shell. The plastic plate fixes multiple heat-conducting tubes on the end surface of the plastic shell, and the heat-conducting tube is connected between two spaced-apart shells. The polyethylene tube passes through the multiple heat-conducting tubes in turn, and the heat-conducting tube is used for positioning and protecting the polyethylene tube. The inner side surface of the plastic shell is tightly and fixedly connected to the heat-conducting tube, and the multiple plastic shells are evenly spaced along the axial direction of the heat-conducting tube. The positions between the plastic shells are fixedly connected to the special-shaped tubes, and the special-shaped tubes are tubular structures with special cross-sections made of plastic material.

[0009] Preferably, the skeleton structure further comprises a plastic plate, the end face of the plastic plate is fixedly mounted on the end face position of the plastic shell, a side of the plastic plate away from the plastic shell is fixedly connected to a special-shaped tube, and an outer surface of the plastic shell is fixedly connected to a rubber ring.

[0010] Preferably, the protective component includes a perforated plate, which is fixedly installed on the surface of the shell near the edge, and the surface of the perforated plate is fixedly connected with an internal threaded sleeve and a stepped platform, respectively. The arc plate is sleeved on the outer surface of the shell, and the arc plate is used to press and limit the sphere at the side position of the shell. The surface of the sphere extends to the outside of the arc plate. When the cable is dragged and installed on the ground, the rolling friction between the surface of the sphere and the uneven ground effectively reduces the frictional resistance and reduces the wear on the outer surface of the cable. During assembly, the connecting ring drives the pin to penetrate into the interior of the internal threaded hole.

[0011] Preferably, the protective component also includes an external threaded sleeve, the end face of which is fixedly mounted on the end face of the step platform, and the external threaded sleeve and the internal threaded sleeve are both made of galvanized steel material.

[0012] Preferably, the surface of the step platform is slidably connected with a pin, the end face of the pin passes through the perforated plate and extends to the inner side of the shell, the number of the pins is multiple, and the surface of the pin is fixedly connected with a connecting ring, a sealed air flow channel is formed between the two shells and the protective component, the blocking limit of the shell controls the length of the sealed air flow channel, the air inlet pipe is used to introduce gas into the interior of the air flow channel, and the exhaust pipe is connected to an external air pump to drive the gas flow, the surfaces of the air inlet pipe and the exhaust pipe are fixedly connected with ventilation pipes, and the two ventilation pipes are far away from each other, the air inlet pipe and the exhaust pipe are used to regulate the gas flow inside the multiple air flow channels, thereby improving the cooling efficiency.

[0013] Preferably, the cooling mechanism comprises an air inlet pipe and an exhaust pipe, and the air inlet pipe and the exhaust pipe are both fixedly mounted on the surface of the barrier mechanism near an edge, and a ventilation pipe is fixedly connected to the surface of the air inlet pipe.

[0014] Preferably, the cooling mechanism also includes a connecting plate, the cylindrical surface of which is fixedly installed at one end of the ventilation pipe away from the air inlet pipe, and an air guide nozzle is fixedly connected to the end face of the connecting plate. Silicone coating is poured into the interior of the external threaded sleeve, and the silicone coating fills the position between the outer surface of the plastic shell and the special-shaped tube, so that a reliable sealing structure is formed inside the external threaded sleeve, and the metal structure of the external threaded sleeve and the internal threaded sleeve is effectively flame-retardant. At the same time, the threaded structure makes the cable easy to bend for transportation and use, the surface of the spiral blade is in close contact with the inner side of the plastic shell, and the recessed position of the inner side of the special-shaped tube is in close contact with the surface of the spiral blade.

[0015] Preferably, there are a plurality of air guide nozzles, a connection frame is fixedly connected to the surface of the connecting disk near the air guide nozzle, and a spiral sheet is fixedly connected to the surface of the connecting frame at a side away from the connecting disk.

[0016] A method for preparing a halogen-free flame-retardant and fire-proof cable comprises the following steps: Step 1, manufacturing the conductor core, at room temperature, drawing the copper rod into copper wire, heating and keeping the copper wire warm, and then naturally cooling the copper wire, twisting the copper wire by twisting multiple single wires to form a copper stranded wire, using a traction machine to pull the copper stranded wire to be coated into the interior of an injection molding extruder to be coated with a hot-melt cross-linked polyethylene material, and cooling and shaping to form a polyethylene tube, thereby completing the preparation of the conductor core; Step 2: Install the barrier structure. Drill multiple inner concave holes at the end surface of the shell. Pass the conductor core in step 1 through multiple heat-conducting tubes in sequence. Pour thermal conductive paint into the position between the conductor core and the heat-conducting tube. The thermal conductive paint is cooled and shaped. Put plastic and rubber particles into the injection molding extruder. The hot-melt plastic is formed into a plastic shell through a die. The special-shaped tube, the plastic plate and the plastic shell are hot-melted and joined. Step 3: Install the skeleton structure. Pass the special-shaped tube, plastic plate and plastic shell through the surface of the heat pipe in sequence. After the structure is positioned, insert the spiral sheet into the interior of the plastic shell. The concave structural surface of the special-shaped tube is in close contact with the surface of the spiral sheet. A cooling gas flow gap is set between the heat pipes. The ventilation pipe is externally connected to the air inlet pipe and the exhaust pipe. The installation of the internal skeleton structure of the cable is completed. Step 4: Heat shrink wrap molding. Set the rubber ring on the outer surface of the plastic shell, weld the internal thread sleeve, external thread sleeve and step platform, slide the heat shrink tube to the outer surface of the rubber ring, and then set the welding structure on the outer surface of the heat shrink tube. Slide the pin to the inside of the shell, pour silicone coating into the inside of the external thread sleeve, and fix the other side of the shell surface near the edge on the end face of the heat pipe to complete the installation of the external protection structure.

[0017] The present invention provides a halogen-free flame-retardant fireproof cable and a preparation method thereof. It has the following beneficial effects: 1. The halogen-free flame-retardant fireproof cable and its preparation method form a sealed cavity between the protective component, the shell and the heat-conducting tube. When the copper strands burn, the barrier of the shell reduces the impact between the multiple copper strands. At the same time, the sealed cavity evenly arranged along the surface of the polyethylene tube makes it difficult for the burning flame to spread. The structure replaces the halogen flame retardant, which solves the problem that a large amount of smoke and toxic gases are generated when the halogen flame retardant burns, and the amount increases with the increase of the combustion temperature.

[0018] 2. The halogen-free flame-retardant fireproof cable and its preparation method, the special-shaped tube and the plastic shell form a supporting structure on the inner side of the cable, so that a gas flow channel is set between the multiple heat-conducting tubes. The gas barrier inside the gas flow channel causes the combustion heat to shrink toward the center and is not easy to expand outward. The shells at both ends of the gas flow channel block the cavity gas. When the polyethylene tube burns, the cavities spaced apart from each other limit the combustion, thereby gradually reducing the combustion trend along the polyethylene tube and achieving a better flame retardant effect.

[0019] 3. The halogen-free flame-retardant fireproof cable and its preparation method, the surfaces of the external threaded sleeve, the internal threaded sleeve and the heat shrinkable tube are opened with injection holes, the silicone coating is poured into the inside of the external threaded sleeve, the coating fills the gap between the external threaded sleeve, the internal threaded sleeve and the heat shrinkable tube through the injection hole, the coating flows to the inside of the stepped platform and the internal threaded hole, after cooling and shaping, due to the extension and fixation of the pin, the external threaded sleeve and the internal threaded sleeve are firmly and sealedly installed on the end face position of the shell, the position between the shell and the external threaded sleeve forms a relatively sealed cavity, thereby preventing external flammable gas from being drawn into the cable.

[0020] 4. The halogen-free flame-retardant fireproof cable and its preparation method have oppositely arranged connecting plates arranged in the middle of the airflow channel, and the centrally symmetrically evenly distributed air guide nozzles are used to make the gas flow more uniform. The position between the polyethylene tube and the heat-conducting tube is filled with thermal conductive coating. When the gas flows through the heat-conducting tube, it takes away the heat from the surface of the polyethylene tube, so that the temperature of the conductive wire core is lower under high pressure, which solves the problem that the high temperature of the conductive wire core under high pressure can easily cause the cable to burn.

[0021] 5. The halogen-free flame-retardant fireproof cable and its preparation method have connecting plates arranged opposite to each other for controlling the introduction and discharge of gas inside the airflow channel. The cooling gas flows on the surface of the spiral blades. The spiral structure of the spiral blades forms a spiral airflow when the gas flows, making the gas flow more directional. A gap is provided between the inner side of the special-shaped tube and the heat-conducting tube. When the airflow carries heat, the cooling gas flows rapidly in the tiny gap. The special-shaped structure of the special-shaped tube effectively increases the heat-conducting area of ​​the heat-conducting tube, making the cable more efficient in cooling and less flammable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flow chart of a method for preparing a halogen-free flame-retardant and fireproof cable; Figure 2 It is a stereoscopic diagram of the whole halogen-free flame-retardant fireproof cable of the present invention; Figure 3 It is a three-dimensional diagram of the interior of the halogen-free flame-retardant and fire-proof cable of the present invention; Figure 4 It is a structural schematic diagram of the barrier mechanism of the present invention; Figure 5 It is a schematic diagram of the connection structure between the barrier mechanism and the protection component of the present invention; Figure 6 It is a structural schematic diagram of the skeleton mechanism of the present invention; Figure 7 It is a structural schematic diagram of the protection component of the present invention; Figure 8 It is a schematic diagram of the structure of a part of the protection component of the present invention; Fig. 9 It is a schematic diagram of the overall structure of the cooling mechanism of the present invention; Fig.10 It is a schematic diagram of the partial structure of the cooling mechanism of the present invention.

[0023] In the figure: 1. copper stranded wire; 2. polyethylene tube; 3. barrier mechanism; 31. shell; 32. internal threaded hole; 33. sphere; 34. arc plate; 35. limit hole; 36. heat transfer pipe; 4. skeleton mechanism; 41. plastic shell; 42. inner circular hole; 43. plastic plate; 44. through hole; 45. rubber ring; 46. special-shaped tube; 5. heat shrink tube; 6. protection component; 61. perforated plate; 62. internal threaded sleeve; 63. step platform; 64. external threaded sleeve; 65. connecting ring; 66. latch; 7. cooling mechanism; 71. air inlet pipe; 72. exhaust pipe; 73. ventilation pipe; 74. connecting plate; 75. air guide nozzle; 76. connecting frame; 77. spiral sheet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] First embodiment: Figure 1-Figure 4 As shown, the present invention provides a technical solution: a halogen-free flame retardant fireproof cable, comprising a copper stranded wire 1, the surface of the copper stranded wire 1 is coated with a polyethylene tube 2 to form a conductive wire core, the number of the conductive wire cores is set to be multiple, and also includes: The blocking mechanism 3 is sleeved on the outer surface of the polyethylene tube 2, and a gap is provided between the inner side of the blocking mechanism 3 and the outer surface of the polyethylene tube 2. The blocking mechanism 3 is used to block the uniform gap on the surface of the polyethylene tube 2; A skeleton mechanism 4, which is fixedly mounted on the outer surface of the barrier mechanism 3, and is used for limiting and centering the plurality of polyethylene tubes 2 and supporting and forming the cooling air flow channel. A heat shrink tube 5 is fixedly connected to the outer surface of the skeleton mechanism 4; A protection component 6, which is fixedly mounted on the surface of the barrier mechanism 3 near the edge, and is used to isolate and protect the polyethylene tube 2 from the outside and to seal the cooling air flow channel; A cooling mechanism 7, which is fixedly mounted on the inner side of the protection assembly 6, and is used for introducing and discharging gas inside the air flow channel; The barrier mechanism 3 includes a shell 31, the end surface of the shell 31 is fixedly connected with a heat-conducting pipe 36, a gap is provided between the inner side of the heat-conducting pipe 36 and the outer surface of the polyethylene tube 2, and a heat-conducting coating is poured into the gap; The blocking mechanism 3 also includes a ball 33, which is rotatably mounted on the outer surface of the housing 31. A curved plate 34 is fixedly connected to the surface of the housing 31 near the ball 33, and a limiting hole 35 is provided on the surface of the curved plate 34. There are two arc plates 34 , the surface of the sphere 33 is rotatably connected to the inner side of the arc plate 34 , a heat pipe 36 is fixedly connected to the end surface of the shell 31 , and an internal threaded hole 32 is opened on the surface of the shell 31 near the edge.

[0026] When in use, the copper stranded wire 1 is prone to overheating under high pressure, causing the polyethylene tube 2 and the outer protective structure to burn. In the device, multiple copper stranded wires 1 and polyethylene tubes 2 are separated and arranged, and multiple shells 31 are sleeved on the outer surface of the polyethylene tube 2. The multiple shells 31 are evenly spaced, and the polyethylene tube 2 is blocked and protected from the outside by the protective component 6. The polyethylene tube 2 passes through the heat-conducting tube 36, and the heat-conducting tube 36 blocks and protects the polyethylene tube 2 to prevent the polyethylene tube 2 from moving and wearing on the inner side of the shell 31. A sealed cavity is formed between the protective component 6, the shell 31 and the heat-conducting tube 36. When the copper stranded wire 1 burns, the blocking of the shell 31 reduces the impact between the multiple copper stranded wires 1. At the same time, the sealed cavity evenly arranged along the surface of the polyethylene tube 2 makes it difficult for the burning flame to spread. The structure is used to replace the halogen flame retardant, which solves the problem that a large amount of smoke and toxic gases are generated when the halogen flame retardant burns, and the amount increases with the increase of the combustion temperature.

[0027] Second embodiment: Figure 4-Figure 6 As shown, the blocking mechanism 3 also includes a ball 33, which is rotatably mounted on the outer surface of the shell 31, and a curved plate 34 is fixedly connected to the surface of the shell 31 near the ball 33, and a limiting hole 35 is provided on the surface of the curved plate 34; There are two arc plates 34, the surface of the sphere 33 is rotatably connected to the inner side of the arc plate 34, the end surface of the shell 31 is fixedly connected to a heat pipe 36, and an internal threaded hole 32 is opened near the edge of the surface of the shell 31; The skeleton mechanism 4 includes a plastic shell 41, which is fixedly mounted on the outer surface of the heat-conducting pipe 36. An inner circular hole 42 is opened in the middle of the surface of the plastic shell 41, and a through hole 44 is opened near the edge of the surface of the plastic shell 41. The skeleton mechanism 4 also includes a plastic plate 43, and the end face of the plastic plate 43 is fixedly mounted on the end face position of the plastic shell 41. A special-shaped tube 46 is fixedly connected to the side of the plastic plate 43 away from the plastic shell 41, and a rubber ring 45 is fixedly connected to the outer surface of the plastic shell 41.

[0028] When in use, the plastic plate 43 fixes the plurality of heat-conducting tubes 36 on the end surface of the plastic shell 41. The heat-conducting tubes 36 are connected to the position between the two spaced shells 31. The polyethylene tube 2 passes through the plurality of heat-conducting tubes 36 in sequence. The heat-conducting tubes 36 are used for positioning and protecting the polyethylene tube 2. The inner side of the plastic shell 41 is tightly and fixedly connected to the heat-conducting tube 36. The plurality of plastic shells 41 are evenly spaced along the axial direction of the heat-conducting tube 36. The positions between the plastic shells 41 are fixedly connected with the special-shaped tubes 46. The special-shaped tubes 46 are tubular structures of special-shaped cross-sections made of plastic material. The special-shaped tubes 46 and the plastic shell 41 form a supporting structure for the inner side of the cable, so that gas flow channels are provided between the plurality of heat-conducting tubes 36. The gas barrier inside the gas flow channel causes the combustion heat to shrink toward the center and is not easy to expand outward. The shells 31 at both ends of the gas flow channel block the cavity gas. When the polyethylene tube 2 burns, the mutually spaced cavities restrict the combustion, thereby gradually reducing the combustion trend along the polyethylene tube 2 and achieving a better flame retardant effect.

[0029] The third embodiment: Figure 4-Figure 8 As shown, the blocking mechanism 3 also includes a ball 33, which is rotatably mounted on the outer surface of the shell 31, and a curved plate 34 is fixedly connected to the surface of the shell 31 near the ball 33, and a limiting hole 35 is provided on the surface of the curved plate 34; There are two arc plates 34, the surface of the sphere 33 is rotatably connected to the inner side surface of the arc plate 34, the end surface of the shell 31 is fixedly connected to the heat conduction pipe 36, and the surface of the shell 31 is provided with an internal threaded hole 32 near the edge; the protection component 6 includes a perforated plate 61, which is fixedly installed on the surface of the shell 31 near the edge, and the surface of the perforated plate 61 is respectively fixedly connected with an internal threaded sleeve 62 and a stepped platform 63, the protection component 6 also includes an external threaded sleeve 64, the end surface of the external threaded sleeve 64 is fixedly installed on the end surface of the stepped platform 63, the external threaded sleeve 64 and the internal threaded sleeve 62 are both made of galvanized steel material, the surface of the stepped platform 63 is slidably connected with a pin 66, the end surface of the pin 66 passes through the perforated plate 61 and extends to the inner side surface of the shell 31, the number of the pins 66 is set to be multiple, and the surface of the pin 66 is fixedly connected with a connecting ring 65.

[0030] When in use, the arc plate 34 is sleeved on the outer surface of the shell 31. The arc plate 34 is used to press and limit the ball 33 at the side position of the shell 31. The surface of the ball 33 extends to the outside of the arc plate 34. When the cable is dragged and installed on the ground, the rolling friction between the surface of the ball 33 and the uneven ground effectively reduces the friction resistance and reduces the wear of the outer surface of the cable. During assembly, the connecting ring 65 drives the pin 66 to penetrate into the inner threaded hole 32. The surfaces of the outer threaded sleeve 64, the inner threaded sleeve 62 and the heat shrink tube 5 are all An injection hole is provided to inject silicone coating into the interior of the external threaded sleeve 64. The coating fills the gap between the external threaded sleeve 64, the internal threaded sleeve 62 and the heat shrink tube 5 through the injection hole. The coating flows to the inside of the stepped platform 63 and the internal threaded hole 32. After cooling and shaping, due to the extension and fixation of the pin 66, the external threaded sleeve 64 and the internal threaded sleeve 62 are firmly and sealedly installed on the end face position of the shell 31. The position between the shell 31 and the external threaded sleeve 64 forms a relatively sealed cavity, thereby preventing external combustible gas from being drawn into the interior of the cable.

[0031] Fourth embodiment: Figure 4 , Fig. 9 As shown, the ball 33 is rotatably mounted on the outer surface of the housing 31, and a curved plate 34 is fixedly connected to the surface of the housing 31 near the ball 33, and a limiting hole 35 is provided on the surface of the curved plate 34; There are two arc plates 34, the surface of the sphere 33 is rotatably connected to the inner side of the arc plate 34, the end surface of the shell 31 is fixedly connected to a heat pipe 36, and an internal threaded hole 32 is opened near the edge of the surface of the shell 31; The cooling mechanism 7 includes an air inlet pipe 71 and an exhaust pipe 72, both of which are fixedly mounted on the surface of the blocking mechanism 3 near the edge, and the surface of the air inlet pipe 71 is fixedly connected to a ventilation pipe 73. The cooling mechanism 7 also includes a connecting plate 74, and the cylindrical surface of the connecting plate 74 is fixedly mounted on the end of the ventilation pipe 73 away from the air inlet pipe 71, and an air guide nozzle 75 is fixedly connected to the end surface of the connecting plate 74. There are multiple air guide nozzles 75, and a connecting frame 76 is fixedly connected to the surface of the connecting plate 74 near the air guide nozzle 75. A spiral sheet 77 is fixedly connected to the side of the surface of the connecting frame 76 away from the connecting plate 74.

[0032] When in use, a sealed air flow channel is formed between the two shells 31 and the protective component 6. The blocking limit of the shell 31 controls the length of the sealed air flow channel. The air inlet pipe 71 is used to introduce gas into the interior of the air flow channel, and the exhaust pipe 72 is connected to an external air pump to drive the gas flow. The surfaces of the air inlet pipe 71 and the exhaust pipe 72 are fixedly connected with ventilation pipes 73, and the two ventilation pipes 73 are far away from each other. The air inlet pipe 71 and the exhaust pipe 72 are used to regulate the gas flow inside multiple air flow channels, thereby improving the cooling efficiency. The oppositely arranged connecting disk 74 is arranged in the middle position of the air flow channel, and the centrally symmetrical and evenly distributed air guide nozzles 75 are used to make the gas flow more uniform. The position between the polyethylene tube 2 and the heat-conducting tube 36 is filled with thermal conductive coating. When the gas flows through the heat-conducting tube 36, it takes away the heat from the surface of the polyethylene tube 2, so that the temperature of the conductive wire core is lower under high voltage, which solves the problem that the high temperature of the conductive wire core under high voltage easily causes the cable to burn.

[0033] Fifth embodiment: Figure 6 , Fig. 9 , Fig.10 As shown, an inner circular hole 42 is opened in the middle of the surface of the plastic shell 41, and a through hole 44 is opened near the edge of the surface of the plastic shell 41. The skeleton mechanism 4 also includes a plastic plate 43, and the end surface of the plastic plate 43 is fixedly installed at the end surface of the plastic shell 41. A special-shaped tube 46 is fixedly connected to the side of the plastic plate 43 away from the plastic shell 41, and a rubber ring 45 is fixedly connected to the outer surface of the plastic shell 41. The end surface of the external threaded sleeve 64 is fixedly mounted on the end surface of the stepped platform 63. The external threaded sleeve 64 and the internal threaded sleeve 62 are both made of galvanized steel. A latch 66 is slidably connected to the surface of the stepped platform 63. The end surface of the latch 66 passes through the perforated plate 61 and extends to the inner side surface of the housing 31. There are multiple latches 66. A connecting ring 65 is fixedly connected to the surface of the latch 66. A ventilation pipe 73 is fixedly connected to the surface of the air inlet pipe 71, and the cooling mechanism 7 also includes a connecting plate 74. The cylindrical surface of the connecting plate 74 is fixedly installed on the end of the ventilation pipe 73 away from the air inlet pipe 71, and an air guide nozzle 75 is fixedly connected to the end surface of the connecting plate 74. There are multiple air guide nozzles 75, and a connecting frame 76 is fixedly connected to the surface of the connecting plate 74 near the air guide nozzle 75. A spiral sheet 77 is fixedly connected to the side of the surface of the connecting frame 76 away from the connecting plate 74.

[0034] When in use, silicone coating is poured into the interior of the external threaded sleeve 64, and the silicone coating fills the position between the outer surface of the plastic shell 41 and the special-shaped tube 46, so that a reliable sealing structure is formed inside the external threaded sleeve 64, and the metal structure of the external threaded sleeve 64 and the internal threaded sleeve 62 is effectively flame-retardant. At the same time, the threaded structure makes the cable easy to bend for transportation and use. The surface of the spiral piece 77 is in close contact with the inner side of the plastic shell 41, and the recessed position of the inner side of the special-shaped tube 46 is in close contact with the surface of the spiral piece 77. The connecting plate 74 arranged oppositely is used to control the introduction and discharge of the gas inside the airflow channel. The cooling gas flows on the surface of the spiral piece 77. The spiral structure of the spiral piece 77 forms a spiral airflow when the gas flows, so that the gas flows with higher directionality. A gap is set between the inner side of the special-shaped tube 46 and the heat-conducting pipe 36. When the airflow carries heat, the cooling gas flows rapidly in the small gap. The special-shaped structure of the special-shaped tube 46 effectively increases the heat-conducting area of ​​the heat-conducting pipe 36, so that the cable has higher cooling efficiency and is less likely to burn.

[0035] Sixth embodiment: Figure 1-Figure 10 As shown, a method for preparing a halogen-free flame retardant and fireproof cable comprises the following steps: Step 1, manufacturing the conductor core, at room temperature, drawing the copper rod into a copper wire, heating and keeping the copper wire warm, and then naturally cooling the copper wire, twisting the copper wire by twisting multiple single wires to form a copper stranded wire 1, using a traction machine to pull the copper stranded wire 1 to be coated into the interior of an injection molding extruder to be coated with a hot-melt cross-linked polyethylene material, and cooling and shaping to form a polyethylene tube 2, thereby completing the preparation of the conductor core; Step 2: Install the barrier structure. Drill multiple inner concave holes at the end surface of the shell 31. Pass the conductor cores in step 1 through multiple heat-conducting tubes 36 in sequence. Pour heat-conducting paint into the position between the conductor cores and the heat-conducting tubes 36. The heat-conducting paint is cooled and shaped. Put plastic and rubber particles into the injection molding extruder. The hot-melt plastic is formed into a plastic shell 41 through a die. The special-shaped tube 46, the plastic plate 43 and the plastic shell 41 are hot-melted and joined. Step 3: Install the skeleton structure. Pass the special-shaped tube 46, the plastic plate 43 and the plastic shell 41 through the surface of the heat-conducting tube 36 in sequence. After the structure is positioned, insert the spiral sheet 77 into the interior of the plastic shell 41. The concave structural surface of the special-shaped tube 46 is in close contact with the surface of the spiral sheet 77. A cooling gas flow gap is set between the heat-conducting tubes 36. The ventilation pipe 73 is externally connected to the air inlet pipe 71 and the exhaust pipe 72. The installation of the internal skeleton structure of the cable is completed. Step 4: Heat shrink wrap molding. Sleeve the rubber ring 45 on the outer surface of the plastic shell 41, weld the internal threaded sleeve 62, the external threaded sleeve 64 and the stepped platform 63, slide the heat shrink tube 5 to the outer surface of the rubber ring 45, and then sleeve the welding structure on the outer surface of the heat shrink tube 5. Slide the pin 66 to the inside of the shell 31, and pour silicone coating into the inside of the external threaded sleeve 64. Fix the other side of the shell 31 surface near the edge on the end face of the heat pipe 36 to complete the installation of the external protective structure.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by... does not exclude the existence of other identical elements in the process, method, article or device including the element".

Claims

1. A halogen-free flame-retardant fireproof cable, comprising a copper stranded wire (1), characterized in that: The surface of the copper stranded wire (1) is coated with a polyethylene tube (2) to form a conductive wire core, and the number of the conductive wire cores is multiple, and further comprises: A blocking mechanism (3), the blocking mechanism (3) being sleeved on the outer surface of the polyethylene tube (2), a gap being provided between the inner side surface of the blocking mechanism (3) and the outer surface of the polyethylene tube (2), the blocking mechanism (3) being used to block uniform gaps on the surface of the polyethylene tube (2); A skeleton structure (4), the skeleton structure (4) being fixedly mounted on the outer surface of the barrier structure (3), the skeleton structure (4) being used for limiting the position and centering of the plurality of polyethylene tubes (2) and supporting and forming the cooling air flow channel, the outer surface of the skeleton structure (4) being fixedly connected with a heat shrink tube (5); A protection component (6), the protection component (6) being fixedly mounted on a surface of the barrier mechanism (3) at a position close to an edge, the protection component (6) being used for barrier protection of the polyethylene tube (2) from the outside and for sealing the cooling air flow passage; A cooling mechanism (7), the cooling mechanism (7) being fixedly mounted on the inner side of the protection component (6), the cooling mechanism (7) being used for introducing and discharging gas inside the air flow channel; The barrier mechanism (3) comprises a shell (31), the end surface of the shell (31) being fixedly connected to a heat-conducting pipe (36), a gap being provided between the inner side surface of the heat-conducting pipe (36) and the outer surface of the polyethylene pipe (2), and a heat-conducting coating being poured into the interior of the gap.

2. The halogen-free flame-retardant fireproof cable according to claim 1, characterized in that: The skeleton structure (4) comprises a plastic shell (41), the plastic shell (41) being fixedly mounted on the outer surface of the heat conducting pipe (36), an inner circular hole (42) being provided at the middle of the surface of the plastic shell (41), and a through hole (44) being provided at a position close to the edge of the surface of the plastic shell (41).

3. The halogen-free flame-retardant fireproof cable according to claim 2, characterized in that: The skeleton structure (4) further comprises a plastic plate (43), the end face of the plastic plate (43) being fixedly mounted at the end face position of the plastic shell (41), a side of the plastic plate (43) away from the plastic shell (41) being fixedly connected to a special-shaped tube (46), and an outer surface of the plastic shell (41) being fixedly connected to a rubber ring (45).

4. The halogen-free flame-retardant fireproof cable according to claim 3, characterized in that: The protection component (6) comprises a perforated plate (61), the perforated plate (61) being fixedly mounted on a surface of the housing (31) at a position close to an edge, and the surface of the perforated plate (61) being respectively fixedly connected with an internal thread sleeve (62) and a stepped platform (63).

5. The halogen-free flame-retardant fireproof cable according to claim 4, characterized in that: The protective assembly (6) further comprises an external threaded sleeve (64), the end surface of the external threaded sleeve (64) being fixedly mounted on the end surface of the stepped platform (63), and the external threaded sleeve (64) and the internal threaded sleeve (62) are both made of galvanized steel material.

6. The halogen-free flame-retardant fireproof cable according to claim 5, characterized in that: A latch (66) is slidably connected to the surface of the stepped platform (63); an end surface of the latch (66) passes through the perforated plate (61) and extends to the inner side surface of the shell (31); a plurality of latches (66) are provided; and a connecting ring (65) is fixedly connected to the surface of the latch (66).

7. The halogen-free flame-retardant fireproof cable according to claim 6, characterized in that: The cooling mechanism (7) comprises an air intake pipe (71) and an exhaust pipe (72), wherein the air intake pipe (71) and the exhaust pipe (72) are both fixedly mounted on a surface of the barrier mechanism (3) at a position close to an edge, and a ventilation pipe (73) is fixedly connected to the surface of the air intake pipe (71).

8. The halogen-free flame-retardant fireproof cable according to claim 7, characterized in that: The cooling mechanism (7) further comprises a connecting plate (74), the cylindrical surface of the connecting plate (74) being fixedly mounted on an end of the ventilation pipe (73) away from the air inlet pipe (71), and an air guide nozzle (75) being fixedly connected to the end surface of the connecting plate (74).

9. The halogen-free flame-retardant fireproof cable according to claim 8, characterized in that: A plurality of air guide nozzles (75) are provided, a connection frame (76) is fixedly connected to a position of the surface of the connecting disk (74) close to the air guide nozzle (75), and a spiral sheet (77) is fixedly connected to a side of the surface of the connecting frame (76) away from the connecting disk (74).

10. A method for preparing a halogen-free flame-retardant fireproof cable, characterized in that: The following steps are involved: Step 1, manufacturing the conductor core, at room temperature, drawing a copper rod into a copper wire, heating and keeping the copper wire warm, and then naturally cooling the copper wire, twisting the copper wire by twisting multiple single wires to form a copper stranded wire (1), using a traction machine to pull the copper stranded wire (1) to be coated into the interior of an injection molding extruder to be coated with a hot-melt cross-linked polyethylene material, and cooling and shaping to form a polyethylene tube (2), thereby completing the preparation of the conductor core; Step 2, installing the barrier structure, drilling a plurality of inner concave holes at the end surface of the shell (31), passing the conductor core in step 1 through a plurality of heat-conducting tubes (36) in sequence, pouring a heat-conducting coating into the position between the conductor core and the heat-conducting tube (36), cooling the heat-conducting coating to set the shape, feeding plastic and rubber particles into an injection molding extruder, and forming the hot-melt plastic into a plastic shell (41) through a die, and hot-melting the special-shaped tube (46), the plastic plate (43) and the plastic shell (41); Step 3: installing the skeleton structure. The shaped tube (46), the plastic plate (43) and the plastic shell (41) are sequentially passed through the surface of the heat conducting tube (36). After the structure is positioned, the spiral sheet (77) is passed into the interior of the plastic shell (41). The inner concave structural surface of the shaped tube (46) is in close contact with the surface of the spiral sheet (77). A cooling gas flow gap is provided between the heat conducting tubes (36). The ventilation tube (73) is externally connected to the air inlet pipe (71) and the exhaust pipe (72). The installation of the internal skeleton structure of the cable is completed. Step 4: Heat shrink wrapping, sleeve the rubber ring (45) on the outer surface of the plastic shell (41), weld the internal thread sleeve (62), the external thread sleeve (64) and the stepped platform (63), slide the heat shrink tube (5) to the outer surface of the rubber ring (45), then sleeve the welding structure on the outer surface of the heat shrink tube (5), slide the pin (66) to the inside of the shell (31), pour silicone coating into the inside of the external thread sleeve (64), and fix the other side of the shell (31) surface near the edge to the end face of the heat conducting tube (36), thereby completing the installation of the external protective structure.

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