Flame-retardant and water-resistant aerial insulated cable, production method and production equipment

Abstract

The application relates to a flame-retardant waterproof overhead insulated cable, a production method and a production device. The production device comprises a mixing bin and a linear extender, a cloth distributor arranged on the working end of the linear extender, a mixer connected with the output end of the mixing bin, a centrifugal-type recycler connected with the output end of the mixing bin and an extrusion unit connected with the mixer. The working end of the linear extender extends into the mixing bin and reciprocates along the axis of the mixing bin. The cloth distributor is arranged inside the mixing bin. The centrifugal-type recycler is also connected with the mixer. The flame-retardant waterproof overhead insulated cable is prepared by using the above production device. The flame-retardant waterproof overhead insulated cable, the production method and the production device disclosed by the application can fully mix the production materials by combining interlayer premixing and forced turbulent mixing, solve the problem of uneven mixing in the preparation process and improve the product quality of the cable.

Description

Technical Field

[0001] This application relates to the field of cable manufacturing technology, and in particular to a flame-retardant and waterproof overhead insulated cable, its manufacturing method, and manufacturing equipment. Background Technology

[0002] Flame-retardant and waterproof overhead insulated cables are a new type of power transmission method that falls between overhead conductors and underground cables. Based on ordinary overhead insulated cables, they are special cables with both flame-retardant and waterproof protection functions through special structural and material design.

[0003] The flame-retardant and waterproof properties of flame-retardant and waterproof overhead insulated cables are mainly achieved through structure and formulation. Specific structural methods include adding an oxygen barrier layer and composite structure to the internal cable structure, filling with water-blocking compounds, and using water-blocking expansion strips. The formulation is achieved by adding functional materials.

[0004] One of the main problems encountered in the formulation during the production process is the poor dispersion of functional material particles, which directly leads to appearance defects and internal structural defects, directly affecting flame retardant and waterproof performance, and also poses a potential risk of reduced insulation performance. Summary of the Invention

[0005] This application provides a flame-retardant and waterproof overhead insulated cable, a production method, and production equipment. By combining interlayer premixing and forced turbulent mixing to fully mix the production materials, the problem of uneven mixing during the preparation process is solved, thereby improving the product quality of the cable.

[0006] The above-mentioned objective of this application is achieved through the following technical solution: In a first aspect, this application provides a production equipment for flame-retardant and waterproof overhead insulated cables, comprising: Mixed storage; A linear expansion joint, the working end of which extends into the mixing chamber and reciprocates along the axis of the mixing chamber; The material distributor is located at the working end of the linear expansion joint, inside the mixing chamber. The mixer is connected to the output of the mixing chamber; The centrifugal recycler is connected to the output of the mixing chamber and is also connected to the mixer. The extrusion unit is connected to the mixer.

[0007] In one possible implementation of the first aspect, the hybrid warehouse includes: shell; The rotating chamber is located inside the outer shell and is rotatably connected to the outer shell. The first discharge channels are evenly distributed on the side wall of the rotating chamber. A closed ring is fitted onto the rotating chamber, and second discharge channels are evenly distributed on the closed ring. A driver, located on the housing, is used to connect and disconnect the first discharge channel and the second discharge channel.

[0008] In one possible implementation of the first aspect, a purger is also provided on the working end of the linear expansion joint, with the purger facing the inner wall of the rotating chamber.

[0009] In one possible implementation of the first aspect, the mixer includes: The mixer housing connects to the mixing chamber; A rotating shaft is located inside the mixer housing and is rotatably connected to the mixer housing; A rotating ring is located on the inner wall of the mixer housing and is rotatably connected to the mixer housing; The first wind turbine is spaced out on the rotating shaft; The second wind turbine is spaced on the rotating ring, and the inner diameter of the second wind turbine is larger than the outer diameter of the first wind turbine. The drive module is used to drive the rotating shaft and the rotating ring to rotate in opposite directions. The first and second wind turbines are arranged alternately.

[0010] In one possible implementation of the first aspect, a circulation channel connected to the mixer housing is also included; The material circulates in a loop consisting of the circulation channel and the mixer housing.

[0011] In one possible implementation of the first aspect, both the first and second wind turbines are tilted in the same direction.

[0012] In one possible implementation of the first aspect, a cloth ring disposed within the mixer housing is also included; The first end of the fabric ring is near the connection between the mixer housing and the mixing chamber; The second end of the fabric ring extends into the area between the first and second impellers.

[0013] In one possible implementation of the first aspect, an air-cooled cooling pipe is provided at the connection between the mixer housing and the mixing chamber, with both ends of the air-cooled cooling pipe connected to the mixer housing and the mixing chamber, respectively. The air-cooled cooling pipe is wrapped with an air-cooled sleeving, and the space between the air-cooled sleeving and the air-cooled cooling pipe is connected to the space inside the air-cooled cooling pipe.

[0014] Secondly, this application provides a method for producing a flame-retardant and waterproof overhead insulated cable, using the production equipment for flame-retardant and waterproof overhead insulated cables as described in the first aspect and any implementation thereof, including: The material is evenly sprayed onto the inner wall of the mixing chamber using a material spreader, and the mixing chamber is rotating during the spraying process. After the material is sprayed, a stack of material is obtained. The stacked material is then fed into a mixer for mixing to obtain the finished product. The finished material is fed into the extrusion unit, which then transports it to the wrapping position. During the transport process, the finished material is heated to melt it. The melted material then wraps around the cable core to obtain a flame-retardant and waterproof overhead insulated cable. When the material is sprayed by the material distributor, a large proportion of the material is sprayed multiple times, while a small proportion of the material is sprayed once.

[0015] Thirdly, this application provides a flame-retardant and waterproof overhead insulated cable, which is manufactured using the production method of the flame-retardant and waterproof overhead insulated cable as described in the second aspect.

[0016] The beneficial technical effects of this application are as follows: The flame-retardant and waterproof overhead insulated cable, its production equipment, and production method disclosed in this invention utilize an innovative mixer structure. This structure employs staggered, counter-rotating impellers to create forced turbulence within the mixer, combined with a circulation channel to achieve repeated material circulation. This, along with a uniform spraying process on the inner wall of the rotating chamber by a material distributor, particularly with the design of multiple sprays for large proportions of material and single sprays for small proportions, significantly improves the dispersion uniformity of key components such as flame retardants and waterproofing agents in the substrate. This avoids the agglomeration of trace additives, thereby greatly enhancing the stability of the flame-retardant and waterproof performance of the cable product.

[0017] Meanwhile, the purger installed in the mixing chamber effectively prevents material adhesion and residue, reducing material waste and batch-to-batch contamination, while the air-cooled cooling pipe structure at the mixer connection can promptly remove the frictional heat generated by high-speed mixing, preventing the material from degrading due to local overheating. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a production equipment for a flame-retardant and waterproof overhead insulated cable provided in this application.

[0019] Figure 2 This is a structural schematic diagram of a fabric feeder on a linear expansion joint provided in this application.

[0020] Figure 3 This is a structural schematic diagram of a hybrid storage container provided in this application.

[0021] Figure 4 This is a schematic diagram of the distribution of the first discharge channel on a rotating chamber provided in this application.

[0022] Figure 5This is a schematic diagram of the distribution of the second discharge channel on a closed ring provided in this application.

[0023] Figure 6 This is a schematic diagram of a support structure provided in this application when a rotating chamber and a closed ring slide relative to each other.

[0024] Figure 7 This is a schematic diagram of the distribution of a feeder and a blower on a linear expansion joint provided in this application.

[0025] Figure 8 This is a structural schematic diagram of a mixer provided in this application.

[0026] Figure 9 This is a schematic diagram illustrating the working principle of a mixer provided in this application.

[0027] Figure 10 This is a schematic diagram of the location of an air-cooled cooling pipe provided in this application.

[0028] Figure 11 This is a schematic diagram illustrating the working principle of an air-cooled cooling pipe and an air-cooled diaphragm provided in this application.

[0029] In the diagram, 2 is the mixing chamber, 3 is the linear expansion joint, 4 is the material distributor, 5 is the mixer, 6 is the centrifugal recycler, 7 is the extrusion unit, 8 is the purger, 9 is the air-cooled cooling pipe, 10 is the air-cooled diaphragm, 21 is the outer shell, 22 is the rotating chamber, 23 is the first discharge channel, 24 is the closed ring, 25 is the second discharge channel, 26 is the driver, 51 is the mixer shell, 52 is the rotating shaft, 53 is the rotating ring, 54 is the first impeller, 55 is the second impeller, 56 is the drive module, 57 is the circulation channel, and 59 is the material distributor ring. Detailed Implementation

[0030] To better understand the technical solutions in this application, the relevant technologies will be explained first.

[0031] Take a reference formula as an example: Base resin: 60-80 parts of ethylene-vinyl acetate copolymer (EVA); Inorganic filler: 10-20 parts; Compatibilizer: 5-10 parts of maleic anhydride-grafted ethylene-vinyl acetate copolymer; Flame retardant: 5-12 parts (using a phosphorus-nitrogen synergistic flame retardant system rich in fluorine atoms, which can form a three-dimensional network structure inside the material to achieve long-lasting flame retardancy and waterproof and moisture-proof properties); Functional additives: 1-3 parts coupling agent, 0.6-0.8 parts lubricant, 0.5-1 part antioxidant, 0.5-1 part ultraviolet absorber, and 0.1-0.2 parts crosslinking aid.

[0032] As can be seen, the base resin, along with other ingredients (inorganic fillers, compatibilizers, flame retardants, and functional additives), contributes to the performance of flame-retardant and waterproof overhead insulated cables. The current mixing method is high-speed mixing, using equipment including high-speed dispersers and dual planetary mixers. The advantages of this mixing method are as follows: High mixing efficiency: The strong shearing, impact and turbulence generated by high-speed rotation can fully mix materials evenly in a very short time, significantly shortening the production cycle; Excellent dispersion and emulsification effects: It can effectively overcome the microscopic forces between particles, break up agglomerated solid particles and disperse them evenly in the liquid, or form a stable emulsion, ensuring the consistency of product quality.

[0033] Negative impact on material properties: Heat sensitivity risk: High-speed stirring generates a large amount of frictional heat, which may cause localized melting of some materials, resulting in secondary agglomeration; Structural damage: Strong mechanical forces may damage the original morphology of particles and cause particle fragmentation. The resulting tiny particles may trigger secondary agglomeration of particles, thus disrupting the uniformity of mixing.

[0034] The technical solutions in this application will be further described in detail below with reference to the accompanying drawings.

[0035] This application discloses a production equipment for flame-retardant and waterproof overhead insulated cables. Please refer to [link / reference]. Figure 1 and Figure 2 In some examples, the production equipment for flame-retardant and waterproof overhead insulated cables disclosed in this application includes a mixing chamber 2, a linear expansion joint 3, a feeder 4, a mixer 5, a centrifugal recycler 6, and an extrusion unit 7. In actual production environments, the mixing chamber 2 is vertically arranged.

[0036] The working end of the linear expansion joint 3 extends into the mixing chamber 2 and reciprocates along the axis of the mixing chamber 2. Its function is to drive the material distributor 4 on the working end of the linear expansion joint 3 to perform linear reciprocating motion in the mixing chamber 2.

[0037] Mixer 5 is connected to the output of mixing chamber 2, and centrifugal recycler 6 is also connected to the output of mixing chamber 2, while centrifugal recycler 6 is also connected to mixer 5. The function of centrifugal recycler 6 here is to recover the residual material in mixing chamber 2.

[0038] Specifically, the material is fed into the mixing chamber 2 for mixing. After mixing, most of the material enters the mixer 5 for processing. However, a small amount of residue remains. This residue is removed by purging. The purging airflow carries this residue into the centrifugal recycler 6 for processing. The separated material is then sent back to the mixer 5 for further processing.

[0039] The extrusion unit 7 is connected to the mixer 5. The material processed by the mixer 5 enters the extrusion unit 7. The screw extrusion structure in the extrusion unit 7 feeds the material into the cable covering position. At the same time, the material is heated during transportation to melt it. The screw transportation process also has a certain mixing effect on the material to some extent.

[0040] In some examples, such as Figure 3 As shown, the mixing chamber 2 includes a housing 21, a rotating chamber 22, a closing ring 24, and a driver 26. The rotating chamber 22 is located inside the housing 21 and is rotatably connected to the housing 21. The closing ring 24 is sleeved on the rotating chamber 22. Specifically, the closing ring 24 is slidably connected to the rotating chamber 22. The corresponding positions on the closing ring 24 and the rotating chamber 22 are respectively provided with a slot and a snap-fit. When the snap-fit ​​slides into the slot, the closing ring 24 rotates with the rotating chamber 22. When the snap-fit ​​slides out of the slot, the connection between the closing ring 24 and the rotating chamber 22 is broken.

[0041] The first discharge channels 23 are evenly distributed on the side wall of the rotating chamber 22. Figure 4 As shown, the second discharge channels 25 are evenly distributed on the closed ring 24. Figure 5 As shown, the first discharge channel 23 and the corresponding second discharge channel 25 can be connected or disconnected, and this is achieved by the driver 26 provided on the housing 21.

[0042] pass Figure 4 and Figure 5 As can be seen, the closed loop 24 needs to move up and down, and the movement is as follows: Figure 6 As shown, the movement path is displayed using a slider and a key.

[0043] In some possible implementations, the actuator 26 uses a miniature cylinder or a linear telescopic unit. When the working end of the actuator 26 extends, it can press against the closed ring 24, connecting the first discharge channel 23 and the corresponding second discharge channel 25. When the working end of the actuator 26 retracts, the first discharge channel 23 and the corresponding second discharge channel 25 are disconnected, and the first discharge channel 23 on the rotating chamber 22 is closed.

[0044] In the actual production process, the material distributor 4 sprays the material onto the inner wall of the rotating chamber 22. The principle followed is to spray a large proportion of the material multiple times, a small proportion of the material once, and to spray different materials alternately. During the spraying process, the rotating chamber 22 is in a rotating state, and at this time, most of the material will be temporarily adsorbed onto the inner wall of the rotating chamber 22.

[0045] After the coating is completed, the closing ring 24 activates, connecting the first discharge channel 23 and the second discharge channel 25. At this time, the rotating chamber 22 continues to rotate, sending the material inside the rotating chamber 22 into the outer shell 21. Under the action of gravity, the material inside the outer shell 21 flows downward. At this time, vibration is needed to accelerate the flow speed of the material and avoid blockage. For example, a vibration motor can be added to the outer wall of the outer shell 21.

[0046] The specific advantages of this method are as follows: By using centrifugal force to temporarily adsorb most of the materials, the materials can be initially dispersed and premixed before mixing. Its advantage is that it avoids the localized incomplete mixing caused by high-speed stirring. Following the principle of multiple sprayings of large proportions of materials, single spraying of small proportions of materials, and alternating spraying of different materials, the uniform distribution of materials with different proportions is ensured from the source of the process, avoiding the problem of local concentrations being too high or too low.

[0047] It should be noted that the resin particles used in cable manufacturing have a particle size of approximately 2mm-4mm, while the commonly used color masterbatch has a particle size of approximately 2mm-3mm. Other additives (plasticizers, flame retardants, lubricants, antioxidants, etc.) can be added to the resin particles, color masterbatch, or individual additive particles in advance. Therefore, in the technical solution provided in this application, the resin particles, color masterbatch, and additive particles can be pre-mixed by centrifugation. The purpose of pre-mixing is to shorten the mixing time and avoid the formation of microparticles due to wear. The negative impacts of microparticles are as follows: Due to their extremely small particle size, microparticles have extremely high surface energy, making them highly prone to agglomeration during mixing, forming large particle clusters. In subsequent extrusion molding, these agglomerates are not only difficult to fully plasticize, but also cause structural defects within the cable insulation layer, severely affecting the uniformity of the material. During mixing or material transfer, microparticles (dust) are easily dispersed and escaped by airflow. This can cause changes in the originally set formula ratio (such as loss of key additives such as flame retardants and stabilizers), resulting in unstable composition of the final cable material and failure to achieve the expected electrical or flame retardant properties. Microparticles (especially inorganic impurities or metal wear powder) mixed into the cable insulation layer can become "defect points" where the local electric field is concentrated, causing electric field distortion, accelerating the aging of insulation materials, and even triggering partial discharge and breakdown.

[0048] In some examples, such as Figure 2 and Figure 7 As shown, the working end of the linear expansion joint 3 is also equipped with a blower 8, which faces the inner wall of the rotating chamber 22. The function of the blower 8 is to clean the inner wall of the rotating chamber 22 by means of airflow.

[0049] In some possible implementations, the purger 8 uses a nozzle.

[0050] In some possible implementations, the feeder 4 described above uses a powder atomizing nozzle, the pipeline of which is fixed to the working end of the driver 26, and is protected by a round tube on the outside.

[0051] The sealing method between the circular tube and the outer casing 21 and the rotating chamber 22 is as follows: An additional sleeve is added, with one end passing through the outer casing 21 and extending into the rotating chamber 22. An O-ring seal is used between the sleeve and the outer casing 21. The piston rod of the linear expansion joint 3 is connected to the rotating chamber 22 via a friction bearing, with a clearance fit selected. Figure 3 Based on the orientation shown, a clearance chamber is set at the highest position inside the rotating chamber 22. The purpose of the clearance chamber is to allow the piston rod of the linear expansion joint 3 to retract to the highest position. At this time, the piston rod of the linear expansion joint 3 is in contact with the channel (circular tube) on the rotating chamber 22, so that the fabric distributor 4 can fully cover the inner wall of the rotating chamber 22.

[0052] To achieve temporary fixation of materials, the materials can be charged and temporarily fixed on the inner wall of the rotating chamber 22 by electrostatic adsorption.

[0053] The advantage of this premixing method is that different types of materials are pre-proportioned.

[0054] In some examples, such as Figure 8 As shown, the mixer 5 includes a mixer housing 51, a rotating shaft 52, a rotating ring 53, a first impeller 54, a second impeller 55, and a drive module 56. The mixer housing 51 is connected to the mixing chamber 2, and the pre-proportioned materials enter the mixer housing 51.

[0055] The rotating shaft 52 is located inside the mixer housing 51 and is rotatably connected to the mixer housing 51. The first impeller 54 is spaced on the rotating shaft 52. The rotating ring 53 is located on the inner wall of the mixer housing 51 and is rotatably connected to the mixer housing 51. The second impeller 55 is spaced on the rotating ring 53.

[0056] The inner diameter of the second wind turbine 55 is larger than the outer diameter of the first wind turbine 54, and the first wind turbine 54 and the second wind turbine 55 are spaced apart.

[0057] The function of the two drive modules 56 is to drive the rotating shaft 52 and the rotating ring 53 to rotate respectively. The two rotate in opposite directions, that is, the first impeller 54 and the second impeller 55 rotate in opposite directions.

[0058] The function of the first impeller 54 and the second impeller 55 is to generate strong shearing and collision. Specifically, since the first impeller 54 and the second impeller 55 rotate in opposite directions, when the material passes through the gap between the two impellers, it will be subjected to strong airflow impact and mechanical shearing force from two opposite directions.

[0059] This relative motion can quickly break up any agglomerated particles in the material, allowing the powders of different components to fully interweave and collide at the microscopic level, thereby achieving extremely high mixing uniformity.

[0060] The counter-rotation of the two impellers creates an extremely complex three-dimensional turbulent field inside the mixer housing 51. Driven by the impellers, the material constantly changes its direction and speed of movement, preventing the formation of regular laminar flow or dead zones within the mixer and ensuring that every part of the material is fully agitated and mixed.

[0061] In some examples, the first impeller 54 and the second impeller 55 are both tilted in the same direction. The purpose is to assist material conveying by generating directional axial thrust. This is because when the impeller blades are tilted, they form a structure similar to a "propeller" or "mixed-flow fan" when rotating.

[0062] When the two impellers are tilted in the same direction, they will generate an axial airflow thrust along the direction of the rotation axis 52 during their rotation. This thrust can guide the material to flow forward along the preset axial path, effectively preventing the material from running around or stagnating inside the mixer shell 51, and ensuring the continuity of the mixing process.

[0063] In addition, there is a gap between the first impeller 54 and the second impeller 55. The reverse rotation itself will generate strong shear force. The blade tilting design makes the linear velocity direction of the impeller edge include not only the tangential component but also the axial component. When the two opposing airflows with axial components converge at the narrow gap, they can form a denser and more efficient shearing mesh, which can quickly break up the agglomerates in the powder.

[0064] In some examples, a circulation channel 57 is added to the mixer housing 51, in which the material circulates in a loop formed by the circulation channel 57 and the mixer housing 51, such as... Figure 9 As indicated by the arrows, when the first wind turbine 54 and the second wind turbine 55 are tilted, the circulation channel 57 does not require additional power.

[0065] When the first impeller 54 and the second impeller 55 are not tilted or the power provided by tilting is insufficient, an auxiliary pump, such as a diaphragm pump, needs to be added to the circulation channel 57 to drive the material to circulate in the loop.

[0066] In some examples, a fabric ring 59 is added inside the mixer housing 51, such as... Figure 8 and Figure 9 As shown, the first end of the fabric ring 59 is close to the connection between the mixer housing 51 and the mixing chamber 2, and the second end of the fabric ring 59 extends into the area between the first impeller 54 and the second impeller 55.

[0067] The function of the fabric ring 59 is to allow the falling material to fall directly between the first impeller 54 and the second impeller 55, so that it can directly participate in the airflow mixing process.

[0068] In some examples, such as Figure 10 and Figure 11 As shown, a cooling pipe 9 is provided at the connection between the mixer shell 51 and the mixing chamber 2. The two ends of the cooling pipe 9 are connected to the mixer shell 51 and the mixing chamber 2 respectively. The function of the cooling pipe 9 is to cool the material.

[0069] It should be noted that during the mixing process, the heat generated by friction may cause localized melting of the material surface, leading to secondary agglomeration. To address this issue, this application employs a pre-cooling method, specifically: The air-cooled cooling pipe 9 is wrapped with an air-cooled partition 10, and the space between the air-cooled partition 10 and the air-cooled cooling pipe 9 is connected to the internal space of the air-cooled cooling pipe 9. Low-temperature air enters the interior of the air-cooled cooling pipe 9 through the air-cooled partition 10 to cool the material inside the air-cooled cooling pipe 9.

[0070] This application also provides a method for producing a flame-retardant and waterproof overhead insulated cable, the specific steps of which are as follows: The material is evenly sprayed onto the inner wall of the mixing chamber 2 using the spreader 4. During the spraying process, the mixing chamber 2 is rotating. After the material is sprayed, a stack of material is obtained. The stacked material is then fed into mixer 5 for mixing to obtain the finished material. The finished material is fed into the extrusion unit 7, which transports the finished material to the wrapping position. During the transportation process, the finished material is heated to melt it. The melted finished material wraps around the cable core to obtain a flame-retardant and waterproof overhead insulated cable. When the material is sprayed by the material distributor 4, a large proportion of the material is sprayed multiple times, while a small proportion of the material is sprayed once.

[0071] This application also provides a flame-retardant and waterproof overhead insulated cable, which is manufactured using the production method of the flame-retardant and waterproof overhead insulated cable as described above.

[0072] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A production equipment for flame-retardant and waterproof overhead insulated cables, characterized in that, include: Mixed silo (2); Linear expansion joint (3), the working end of the linear expansion joint (3) extends into the mixing chamber (2) and reciprocates along the axis of the mixing chamber (2); The material distributor (4) is located at the working end of the linear expansion joint (3) and inside the mixing chamber (2); The mixer (5) is connected to the output of the mixing chamber (2); The centrifugal recycler (6) is connected to the output end of the mixing chamber (2), and the centrifugal recycler (6) is also connected to the mixer (5); The extrusion unit (7) is connected to the mixer (5).

2. The production equipment for flame-retardant and waterproof overhead insulated cables according to claim 1, characterized in that, The mixed storage compartment (2) includes: Outer shell (21); The rotating chamber (22) is located inside the outer shell (21) and is rotatably connected to the outer shell (21). The first discharge channels (23) are evenly distributed on the side wall of the rotating chamber (22). A closed ring (24) is fitted on the rotating chamber (22), and a second discharge channel (25) is evenly distributed on the closed ring (24). A driver (26), located on the housing (21), is used to connect and disconnect the first discharge channel (23) and the second discharge channel (25).

3. The production equipment for flame-retardant and waterproof overhead insulated cables according to claim 2, characterized in that, A blower (8) is also provided on the working end of the linear expansion joint (3), and the blower (8) faces the inner wall of the rotating chamber (22).

4. The production equipment for flame-retardant and waterproof overhead insulated cables according to claim 1, characterized in that, The mixer (5) includes: The mixer housing (51) is connected to the mixing chamber (2); The rotating shaft (52) is located inside the mixer housing (51) and is rotatably connected to the mixer housing (51); A rotating ring (53) is provided on the inner wall of the mixer housing (51) and is rotatably connected to the mixer housing (51); The first wind turbine (54) is spaced on the rotating shaft (52); The second wind turbine (55) is spaced on the rotating ring (53), and the inner diameter of the second wind turbine (55) is larger than the outer diameter of the first wind turbine (54); The drive module (56) is used to drive the rotating shaft (52) and the rotating ring (53) to rotate, and the rotating shaft (52) and the rotating ring (53) rotate in opposite directions; The first wind turbine (54) and the second wind turbine (55) are arranged alternately.

5. The production equipment for flame-retardant and waterproof overhead insulated cables according to claim 4, characterized in that, It also includes a circulation channel (57) connected to the mixer housing (51); The material circulates in a loop consisting of the circulation channel (57) and the mixer housing (51).

6. The production equipment for flame-retardant and waterproof overhead insulated cables according to claim 5, characterized in that, The first wind turbine (54) and the second wind turbine (55) are both tilted and tilted in the same direction.

7. The production equipment for flame-retardant and waterproof overhead insulated cables according to claim 5, characterized in that, It also includes a fabric ring (59) located inside the mixer housing (51); The first end of the fabric ring (59) is close to the connection between the mixer housing (51) and the mixing chamber (2); The second end of the fabric ring (59) extends into the area between the first impeller (54) and the second impeller (55).

8. The production equipment for flame-retardant and waterproof overhead insulated cables according to claim 5, characterized in that, A cooling pipe (9) is provided at the connection between the mixer shell (51) and the mixing chamber (2). The two ends of the cooling pipe (9) are connected to the mixer shell (51) and the mixing chamber (2) respectively. The air-cooled cooling pipe (9) is wrapped with an air-cooled partition (10), and the space between the air-cooled partition (10) and the air-cooled cooling pipe (9) is connected to the space inside the air-cooled cooling pipe (9).

9. A method for producing a flame-retardant and waterproof overhead insulated cable, using the production equipment for flame-retardant and waterproof overhead insulated cables as described in any one of claims 1 to 8, characterized in that, include: The material is evenly sprayed onto the inner wall of the mixing chamber (2) using a cloth feeder (4). During the spraying process, the mixing chamber (2) is rotating. After the material is sprayed, a stacked material is obtained. The stacked material is then fed into a mixer (5) for mixing to obtain the finished material. The finished material is fed into the extrusion unit (7), and the extrusion unit (7) transports the finished material to the wrapping position. During the transportation process, the finished material is heated to melt it. The melted finished material wraps around the cable core to obtain a flame-retardant and waterproof overhead insulated cable. When the material is sprayed by the material distributor (4), a large proportion of the material is sprayed multiple times, while a small proportion of the material is sprayed once.

10. A flame-retardant and waterproof overhead insulated cable, characterized in that, It is prepared using the production method of the flame-retardant and waterproof overhead insulated cable as described in claim 9.

Images