An overhead insulated cable with an ice-preventing coating

Abstract

The application discloses an overhead insulated cable with an anti-icing coating layer and relates to the technical field of insulated cables, which comprises a cable body and a connecting terminal. The anti-pulling mechanism comprises a plurality of anti-pulling ropes, a cylindrical cage formed by the plurality of anti-pulling ropes and a plurality of arc-shaped ropes, and the cylindrical cage is axially straightened by being extruded and fixed with the aluminum conductor through the connecting terminal. The anti-pulling mechanism further comprises two semicircular blocks which are linked through an outer ring, an inner ring and the semicircular blocks, and are further matched with protrusions and connecting blocks to form secondary extrusion locking of the anti-pulling ropes and the aluminum conductor. The anti-pulling mechanism can realize the cooperative fixing and force transmission of the aluminum alloy core and the cylindrical cage. When the overhead insulated cable is subjected to external forces such as wind load and icing in a long-term process, the overhead insulated cable will not have hidden troubles such as loose fixing, disengagement of the aluminum alloy core, the added anti-pulling structure and the terminal, the service life of the overhead insulated cable is prolonged, and the high requirements of the safe operation of the power grid are met.

Description

Technical Field

[0001] This invention relates to the field of insulated cable technology, specifically to an overhead insulated cable with an anti-icing coating. Background Technology

[0002] Cables are electrical wires composed of conductors, insulation layers, and sheaths. They are mainly used in indoor, underground, and outdoor environments. Among them, outdoor overhead insulated cables are special cables used for aerial installation. Their conductors are covered with weather-resistant insulation structures, providing insulation, protection against electric shock, and resistance to wind, rain, and sun.

[0003] The tensile strength of existing overhead insulated cables mainly relies on the central aluminum alloy or steel core, which is difficult to adapt to long-span laying and complex weather conditions. Although some products have optimized the tensile strength of cables by adding composite tensile structures such as aramid fibers, the overall tensile system is still based on a single core, and the problem of concentrated stress still exists. Secondly, the cable end fixing generally adopts a single fixing mode. Even if there is multi-pressure point fixing, it is only a one-sided concentrated fixing of the terminal, the load-bearing core, or the added tensile structure. It cannot achieve the coordinated fixing and force transmission of the load-bearing core and the added tensile structure. Under the action of wind load, icing and other external forces, the cable is prone to loosening of the fixing, detachment of the load-bearing core, the added tensile structure and the terminal, which will shorten the service life of the overhead insulated cable and make it difficult to meet the high requirements of power grid safe operation.

[0004] Therefore, we propose an overhead insulated cable with an anti-icing coating to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide an overhead insulated cable with an anti-icing coating to solve the problem that the existing cable has a single tensile strength system and poor fixing effect due to the multi-pressure point fixing method, thereby shortening the service life of the overhead insulated cable.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an overhead insulated cable with an anti-icing coating, comprising a cable body and connecting terminals, wherein the end of the cable body is provided with a tensile mechanism, the cable body comprises an aluminum alloy core and a plurality of aluminum conductors, and the surface of the aluminum alloy core is provided with conductive elements, which are composed of a plurality of aluminum conductors twisted together. The tensile mechanism includes multiple tensile ropes, and multiple arc-shaped ropes are fixed between each pair of adjacent tensile ropes. The cylindrical cage composed of the multiple tensile ropes and the multiple arc-shaped ropes is pressed and fixed to the aluminum conductor through the connecting terminal and is axially straightened. It also includes two semicircular blocks, each with multiple protrusions fixed on its inner wall. An inner ring is provided between the outer surfaces of the two semicircular blocks. Multiple positioning grooves are pre-set on the inner wall of the inner ring and the outer surfaces of the two semicircular blocks. An outer ring is fitted onto the inner ring. A connecting block is fixed at one end of each semicircular block. Multiple pressing blocks are fixed on the inner wall of each outer ring. When the outer wall of the connecting terminal is pressed, the outer ring, inner ring and semicircular blocks are linked together, and with the help of the protrusions and connecting blocks, it can be used to resist the secondary compression and locking of the pull rope and the aluminum conductor.

[0007] Preferably, one end of each of the tensile ropes is located between two corresponding positioning grooves. When the outer wall of the connecting terminal is deformed by pressure, it can be used to limit the connecting block. The surface of each protrusion abuts against the surface of the aluminum alloy core. The aluminum alloy core is located between two connecting blocks. The outer ring is fixed inside the connecting terminal.

[0008] Preferably, the aluminum alloy core is located between two semicircular blocks, the outer wall of the outer ring is in contact with the inner wall of the connecting terminal, and the number of positioning grooves on the inner ring is twice the number of positioning grooves on each semicircular block.

[0009] Preferably, the multiple curved ropes and multiple tensile ropes are made of polyester high-elastic industrial filaments that have been impregnated with sizing agent, and the two are woven together in a cross-weaving manner to form a cylindrical cage.

[0010] Preferably, a water-blocking filler material is provided between the aluminum alloy core and the plurality of aluminum conductors. The water-blocking filler material is composed of superabsorbent resin and polyester fiber, with a pH value of 6.5-7.5 and a unit weight of 3.2-5.9 g / m.

[0011] Preferably, the outer surface of the water-blocking filler is provided with a conductive shielding layer, which is made of cross-linked semi-conductive XLPE with a carbon black content of 25%-30% and a thickness of 0.8-1.0 mm.

[0012] Preferably, the outer surface of the conductor shielding layer is provided with a weather-resistant inner layer, and each tensile rope and each arc rope is embedded inside the weather-resistant inner layer. The weather-resistant inner layer is made of semi-transparent cross-linked polyethylene (XLPE), with a thickness of 1.2-1.5 mm and a density of 0.92 to 0.94 g / cm³. 3 The coefficient of linear expansion is 1.5-2.0×10⁻⁶. -4 / ℃.

[0013] Preferably, the outer surface of the weather-resistant inner layer is provided with a weather-resistant outer layer, which is made of elastically modified XLPE, 2.3%-2.5% carbon black, and a UV stabilizer, with a thickness of 1.5-2.0 mm and a density of 0.93-0.95 g / cm³. 3The coefficient of linear expansion is 1.0-1.3×10⁻⁶. -4 / ℃.

[0014] Preferably, the outer surface of the weather-resistant outer layer is provided with an elastic transition layer, which is made of modified butyl rubber, has a thickness of 0.5-0.8 mm, and a density of 0.95-1.05 g / cm³. 3 .

[0015] Preferably, the outer surface of the elastic transition layer is provided with an anti-icing coating. The anti-icing coating is a three-layer composite structure, consisting of a primer, an elastic intermediate coating, and a superhydrophobic topcoat. The primer material is a silane coupling agent with a thickness of 3-5 μm, the elastic intermediate coating material is a soft siloxane elastomer with a thickness of 20-40 μm, and the superhydrophobic topcoat material is nano-silica with fluorocarbon and a thickness of 10-20 μm.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by setting up a tensile mechanism, the aluminum alloy core and the cylindrical cage can be coordinated for fixation and force transmission. In this way, when the overhead insulated cable is subjected to external forces such as wind load and icing over a long period of time, there will be no hidden dangers such as loosening of fixation, separation of aluminum alloy core, additional tensile structure and terminals, etc., which improves the service life of overhead insulated cable and meets the high requirements for safe operation of power grid. Through the inner ring cooperation, the separation of two semicircular blocks in contact can be restricted. Through the positioning groove cooperation, the positional movement of one end of the tensile rope after installation can be restricted, thereby avoiding the reduction of tensile effect.

[0017] 2. In this invention, the gap between the aluminum conductor and the aluminum alloy core can be filled by water-blocking filling material, and the electric field on the surface of the aluminum conductor can be uniformly distributed by conductor shielding layer, eliminating the air gap between the aluminum conductor and conductor shielding layer, suppressing partial discharge, avoiding insulation breakdown caused by electric field concentration, and ensuring electrical operation safety.

[0018] 3. In this invention, the elastic transition layer can absorb the deformation and shear stress generated by the thermal expansion and contraction of the weather-resistant outer layer, protecting the anti-icing coating from cracking and peeling. The anti-icing coating can also achieve anti-icing and easy de-icing effects, thereby reducing the risk of ice damage, protecting the surface of the substrate, and reducing maintenance costs. Attached Figure Description

[0019] Figure 1 This is a frontal view of the cable body, connecting terminals, and tensile mechanism of an overhead insulated cable with an anti-icing coating according to the present invention. Figure 2 This is a three-dimensional structural diagram of the cable body and tensile mechanism of an overhead insulated cable with an anti-icing coating according to the present invention. Figure 3This is a partial sectional perspective view of an overhead insulated cable with an anti-icing coating according to the present invention. Figure 4 This invention relates to an overhead insulated cable with an anti-icing coating. Figure 3 Enlarged 3D view of the structure at point A in the middle; Figure 5 This is a perspective view of another part of an overhead insulated cable with an anti-icing coating according to the present invention. Figure 6 This is a side view structural diagram of an overhead insulated cable with an anti-icing coating according to the present invention. Figure 7 This is a schematic cross-sectional view of an overhead insulated cable with an anti-icing coating according to the present invention. Figure 8 This is a three-dimensional structural diagram of a semi-circular block, a protrusion, a positioning groove, and a connecting block of an overhead insulated cable with an anti-icing coating according to the present invention.

[0020] In the diagram: 1. Cable body; 11. Aluminum alloy core; 12. Aluminum conductor; 13. Water-blocking filler material; 14. Conductor shielding layer; 15. Weather-resistant inner layer; 16. Weather-resistant outer layer; 17. Elastic transition layer; 18. Anti-icing coating layer; 2. Connecting terminal; 3. Tensile mechanism; 31. Tensile rope; 32. Semicircular block; 33. Protrusion; 34. Inner ring; 35. Positioning groove; 36. Outer ring; 37. Connecting block; 38. Extrusion block; 39. Curved rope. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 8 The present invention provides a technical solution: an overhead insulated cable with an anti-icing coating, comprising a cable body 1 and a connecting terminal 2, wherein the end of the cable body 1 is provided with a tensile mechanism 3, the cable body 1 comprises an aluminum alloy core 11 and a plurality of aluminum conductors 12, the surface of the aluminum alloy core 11 is provided with conductive elements, and the conductive elements are composed of a plurality of aluminum conductors 12 twisted together. The tensile mechanism 3 includes multiple tensile ropes 31, and multiple arc ropes 39 are fixed between each two adjacent tensile ropes 31. The cylindrical cage composed of multiple tensile ropes 31 and multiple arc ropes 39 is pressed and fixed to the aluminum conductor 12 through the connecting terminal 2 and is axially straightened. It also includes two semicircular blocks 32, each with multiple protrusions 33 fixed on its inner wall. An inner ring 34 is provided between the outer surfaces of the two semicircular blocks 32. Multiple positioning grooves 35 are pre-set on the inner wall of the inner ring 34 and the outer surfaces of the two semicircular blocks 32. An outer ring 36 is sleeved on the inner ring 34. A connecting block 37 is fixed at one end of each semicircular block 32. Multiple pressing blocks 38 are fixed on the inner wall of each outer ring 36. When the outer wall of the connecting terminal 2 is pressed, the outer ring 36, the inner ring 34 and the semicircular blocks 32 are linked together, and with the help of the protrusions 33 and the connecting blocks 37, it can be used to resist the secondary compression and locking of the pull rope 31 and the aluminum conductor 12.

[0023] One end of each anti-tension rope 31 is located between two corresponding positioning grooves 35. When the outer wall of the connecting terminal 2 is deformed by pressure, it can be used to limit the connecting block 37. The surface of each protrusion 33 abuts against the surface of the aluminum alloy core 11. The aluminum alloy core 11 is located between two connecting blocks 37. The outer ring 36 is fixed inside the connecting terminal 2.

[0024] The aluminum alloy core 11 is located between the two semicircular blocks 32. The outer wall of the outer ring 36 is in contact with the inner wall of the connecting terminal 2. The number of positioning grooves 35 on the inner ring 34 is twice the number of positioning grooves 35 on each semicircular block 32.

[0025] The multiple curved ropes 39 and multiple tensile ropes 31 are made of polyester high-elastic industrial filaments with impregnation treatment, and the two are woven in a cross-weaving method to form a cylindrical cage.

[0026] By adopting the above technical solution, when it is necessary to connect the cable body 1 and the connecting terminal 2, the aluminum alloy core 11, the cylindrical cage and the aluminum conductor 12 are first exposed, and part of the length of the aluminum conductor 12 is removed. Then, a semi-circular block 32 with a protrusion 33 is installed to press and fix the aluminum alloy core 11. Next, the inner ring 34, the outer ring 36 and the pressing block 38 are installed in sequence to restrict one end of the tensile rope 31 that is bent and positioned in the positioning groove 35. Then, the connecting terminal 2 is pressed and deformed to lock the cylindrical cage and the aluminum alloy core 11. This method can not only increase the tensile strength of the overhead insulated cable and solve the problem of a single tensile system, but also allow the aluminum alloy core 11 and the cylindrical cage to work together to bear force and transmit force as a whole, thereby avoiding the problem of individual components bearing force and uneven load, and improving the service life of the overhead insulated cable.

[0027] Specifically, such as 1- Figure 3 , Figure 6 and Figure 7 As shown, a water-blocking filler 13 is provided between the aluminum alloy core 11 and multiple aluminum conductors 12. The water-blocking filler 13 is composed of super absorbent resin and polyester fiber, with a pH value of 6.5-7.5 and a unit weight of 3.2-5.9 g / m.

[0028] The outer surface of the water-blocking filler 13 is provided with a conductor shielding layer 14, which is made of cross-linked semi-conductive XLPE with a carbon black content of 25%-30% and a thickness of 0.8-1.0 mm.

[0029] A weather-resistant inner layer 15 is provided on the outer surface of the conductor shielding layer 14. Each tensile rope 31 and each arc rope 39 is embedded inside the weather-resistant inner layer 15. The weather-resistant inner layer 15 is made of semi-transparent cross-linked polyethylene (XLPE), with a thickness of 1.2-1.5 mm and a density of 0.92 to 0.94 g / cm³. 3 The coefficient of linear expansion is 1.5-2.0×10⁻⁶. -4 / ℃.

[0030] The outer surface of the weather-resistant inner layer 15 is provided with a weather-resistant outer layer 16. The weather-resistant outer layer 16 is made of elastic modified XLPE, carbon black (2.3%-2.5%), and UV stabilizer, with a thickness of 1.5-2.0 mm and a density of 0.93-0.95 g / cm³. 3 The coefficient of linear expansion is 1.0-1.3×10⁻⁶. -4 / ℃.

[0031] An elastic transition layer 17 is provided on the outer surface of the weather-resistant outer layer 16. The elastic transition layer 17 is made of modified butyl rubber, with a thickness of 0.5-0.8 mm and a density of 0.95-1.05 g / cm³. 3 .

[0032] By adopting the above technical solutions, the aluminum alloy core 11 provides tensile strength for the entire overhead insulated cable, the aluminum conductor 12 enables power transmission, the water-blocking filler 13 fills the gap between the aluminum conductor 12 and the aluminum alloy core 11, the conductor shielding layer 14 evens out the electric field on the surface of the aluminum conductor 12, eliminates the air gap between the aluminum conductor 12 and the conductor shielding layer 14, suppresses partial discharge, avoids insulation breakdown caused by electric field concentration, and ensures safe electrical operation. The weather-resistant inner layer 15 provides long-term protection against current leakage, the weather-resistant outer layer 16 provides auxiliary insulation while resisting outdoor ultraviolet rays, wind, rain and ozone erosion, and the elastic transition layer 17 absorbs the deformation and shear stress generated by the thermal expansion and contraction of the weather-resistant outer layer 16, protecting the anti-icing coating 18 from cracking and falling off.

[0033] Specifically, such as Figure 1 Figure 3 Figure 6 and Figure 7As shown, an anti-icing coating 18 is provided on the outer surface of the elastic transition layer 17. The anti-icing coating 18 is a three-layer composite structure, consisting of a primer, an elastic intermediate coating, and a superhydrophobic topcoat. The primer material is a silane coupling agent with a thickness of 3-5 μm. The elastic intermediate coating material is a soft siloxane elastomer with a thickness of 20-40 μm. The superhydrophobic topcoat material is nano-silica with fluorocarbon and a thickness of 10-20 μm.

[0034] By adopting the above technical solutions, the primer can enhance the interfacial bonding force between the elastic transition layer 17 and the anti-icing coating 18, improve the wettability of the substrate surface, and prevent the anti-icing coating 18 from peeling or falling off due to thermal expansion and contraction or external forces. The elastic intermediate coating can absorb the deformation and shear stress generated by the thermal expansion and contraction of the cable, block the upward transmission of stress, and prevent the anti-icing coating 18 from cracking. The superhydrophobic topcoat can construct a low surface energy micro-nano structure to achieve a superhydrophobic effect, thereby significantly reducing the adhesion strength of ice and playing the role of preventing icing and easy de-icing. At the same time, it can also be resistant to ultraviolet rays and weathering.

[0035] Detailed implementation method: In practical applications... First, using a special tool, remove the anti-icing coating 18, elastic transition layer 17, weather-resistant outer layer 16, weather-resistant inner layer 15, conductor shielding layer 14, and water-blocking filler material 13 from the end of the cable body 1 in sequence (the length removed depends on the size of the connecting terminal 2 to which it is installed) until the aluminum conductor 12 and aluminum alloy core 11 are fully exposed, without damaging the cylindrical cage composed of tensile rope 31 and arc rope 39. Then, cut off the aluminum conductor 12 (the removal length depends on the sum of the lengths of the semicircular block 32 and the connecting block 37). Next, remove the outer circle... Ring 36 is welded inside the connecting terminal 2. Then, two semicircular blocks 32 with protrusions 33 are wrapped around the aluminum alloy core 11, and the two semicircular blocks 32 are pressed tightly together so that their opposite sides contact each other. At this time, the protrusions 33 will be in tight contact with the aluminum alloy core 11. When the semicircular blocks 32 have completed the wrapping operation of the corresponding aluminum alloy core 11, the surface of the connecting block 37, which moves accordingly, will also contact the end of each aluminum conductor 12. Then, one end of each tensile rope 31 is bent first, and then the bent end of each... One end of each tensile rope 31 is placed on the corresponding positioning groove 35 on the two semicircular blocks 32. Next, the installation angle of the inner ring 34 is adjusted, and then it is fitted between the outer surfaces of the two semicircular blocks 32 until the positioning groove 35 on the inner ring 34 is aligned with one end of each tensile rope 31. When the inner ring 34 is installed, the connecting terminal 2 is moved, causing the connecting terminal 2 to move the outer ring 36, which has a fixed pressing block 38, onto the inner ring 34. Then, a special tool is used to apply external pressure to the connecting terminal 2. The force is applied to the aluminum alloy core 11, causing it to deform under pressure. When the connecting terminal 2 is pressed and deformed, it will simultaneously lock the cylindrical cage structure. The force is transmitted to the aluminum alloy core 11 through the semi-circular block 32, protrusion 33, inner ring 34, outer ring 36, connecting block 37 and extrusion block 38, so that the aluminum alloy core 11 and the cylindrical cage form a linkage. Compared with the traditional multi-pressure point independent fixing mode, this method opens up the force transmission path and realizes that the aluminum alloy core 11 and the cylindrical cage are subjected to force together and the force is transmitted as a whole, thereby avoiding the problem of individual components being subjected to force and uneven load. During the fabrication of the cable body 1, a high-strength, heat-resistant aluminum alloy rod is first selected, and then drawn into an aluminum alloy core 11 of the required diameter using a wire drawing machine. Next, the aluminum alloy core 11 is subjected to a return process, with the temperature controlled at 320-380℃, and kept at that temperature until natural cooling to eliminate internal stress and improve flexibility and tensile strength. After this process, a high-purity electrical aluminum rod is selected and drawn into an aluminum conductor 12 of the required diameter using a wire drawing machine. Then, a water-blocking filler material 13 is axially and continuously wound or spirally wrapped around the surface of the aluminum alloy core 11. After filling is completed, multiple aluminum conductors 12 are concentrically twisted around the aluminum alloy core 11, with simultaneous compaction during twisting (using a circular or irregularly shaped compaction die). The compaction coefficient is controlled between 0.93 and 0.96, which allows the water-blocking filler material 13 to be compacted and sealed between the aluminum conductors 12 and the aluminum alloy core 11, achieving longitudinal water blocking and radial sealing. Once the aluminum conductors 12 are completely and tightly wrapped around the aluminum alloy core 11, the shielding material is extruded onto the aluminum conductors 12 using an extruder, with the temperature controlled at 120-150℃. The thickness is controlled at 0.8-1.0 mm. After extrusion, it is rapidly cooled and shaped in a low-temperature bath (20-40℃) to ensure dimensional stability. When the conductor shielding layer 14 is completed, a cylindrical cage composed of arc-shaped rope 39 and tensile rope 31 is placed over the conductor shielding layer 14. At the same time, the weather-resistant inner layer 15 material is extruded over the conductor shielding layer 14 using an extruder. The temperature is controlled at 180-220℃, and the thickness is controlled at 1.2-1.5 mm. After extrusion, it is also rapidly cooled and shaped in a low-temperature bath (20-40℃) to ensure dimensional stability. To ensure stability, once the weather-resistant inner layer 15 is completed, the cylindrical cage is completely submerged within it. Then, the weather-resistant outer layer 16 is extruded over the weather-resistant inner layer 15 using an extruder, with a thickness controlled at 1.5-2.0 mm. After extrusion, it is rapidly cooled and shaped in a low-temperature bath (20-40℃) to ensure dimensional stability. Once the weather-resistant outer layer 16 is completed, the elastic transition layer 17 is extruded over it again using an extruder, with the temperature controlled at 100-140℃ and the thickness controlled at 0.5-0.The material is extruded to a thickness of 8mm and then cooled and set. Once the elastic transition layer 17 is processed, a primer is applied to its surface using high-voltage electrostatic micro-spraying, with a thickness controlled at 3-5μm. It is then flash-dried with hot air at 60-80℃ for 5-10 minutes. After the primer is applied and cooled, an elastic intermediate coating is applied to it using airless spraying, with a thickness controlled at 20-40μm. This intermediate coating is then cured in sections at 80-100℃ for 15-20 minutes. After the intermediate coating is applied and cooled, a superhydrophobic topcoat is applied to it using ultrasonic atomization, with a thickness controlled at 10-20μm. This is then heat-cured at room temperature plus 100-120℃ for 10-15 minutes to form a micro-nano structured superhydrophobic surface layer. Once the anti-icing coating 18 is processed, the cable body 1 is obtained.

[0036] Among them, the water-blocking filler 13 is made of superabsorbent resin and polyester fiber, and the manufacturing steps are as follows: Preparation of superabsorbent polymer (SAP) solution: First, add deionized water to the preparation reactor, keeping the liquid temperature at a low temperature (10-40℃) to dissolve the sodium hydroxide in the reactor. Then, slowly add acrylic acid dropwise to the mixed liquid to neutralize the pH value to 6.2-6.5. Next, add acrylamide and ammonium persulfate in sequence, stirring constantly during the process to dissolve them. When the temperature of the mixed liquid drops to 30℃, add the crosslinking agent N-hydroxymethylacrylamide to the mixed liquid and continue stirring for 30-35 minutes to prepare the crosslinkable absorbent polymer solution. Polyester fiber treatment: The polyester filament is continuously unwound and immersed in a polyvinyl alcohol adhesive aqueous solution. Then, the excess adhesive is scraped off with a double roller. Next, it is sent into a hot air drying channel at 115-120℃ for 5-7 minutes to form an adhesive underlayer on the surface of the polyester fiber. Finally, the treated polyester fiber is first passed through a superabsorbent resin immersion tank, then coated with a double roller to control the thickness, and then placed in a 190-200℃ high-temperature hot drying channel for 2-5 minutes to allow the surface of the polyester fiber to solidify and form a superabsorbent resin layer. After cooling to room temperature, it can be continuously wound up.

[0037] The conductor shielding layer 14 is made of 25%-30% carbon black and cross-linked semiconductive XLPE, and the manufacturing steps are as follows: First, dry the required amount of carbon black with hot air at 100-102℃ for 1.9-2 hours to remove its moisture; Then, use a high-speed mixer to evenly disperse the hindered phenol / phosphite compound antioxidant and DCP crosslinking agent on the surface of PE particles, with the speed controlled at 600-620 r / min and the temperature controlled at 15-17 min. The carbon black agglomerates are then broken up by strong shearing using a twin-screw extruder (temperature segmentation: feeding zone 160-165℃, mixing zone 180-195℃, homogenization zone 190-195℃, die 195-197℃; screw speed 300-305r / min). The extruder barrel is then vacuum-exhausted to remove volatiles and moisture. Next, the molten material is extruded through a 4mm die into a continuous strip, which is then rapidly cooled and shaped in a 23-25℃ cold water bath, and then drawn into a pelletizer to be cut into 3-4mm cylindrical particles. Finally, use a centrifuge to remove the water from the surface of the cylindrical particles, and then dry them with hot air at 78-80℃ until the moisture content of the cylindrical particles is 0.02-0.05%.

[0038] The weather-resistant outer layer 16 is made of elastically modified XLPE, 2.3%-2.5% carbon black, and UV stabilizer. The manufacturing steps are as follows: First, LLDPE and POE elastomer are thoroughly mixed in a premixer at a ratio of 85:15, at a temperature of 80-82℃, for 10-12 minutes, to prepare a high-elasticity, low-modulus modified PE base material. Then, carbon black, HALS hindered amine UV stabilizer and antioxidant 1010 are thoroughly mixed in another premixer to obtain weather-resistant functional masterbatch. Next, the elastic low-modulus modified PE base material and weather-resistant functional masterbatch are sequentially processed and mixed using a twin-screw extruder (temperature 165-190℃) while vacuum degassing is used to remove low-molecular-weight volatiles. Finally, the extruded material is first granulated underwater, and then dried at a low temperature of 70-75℃.

[0039] The weather-resistant inner layer 15 is made of semi-transparent cross-linked polyethylene (XLPE), and the manufacturing process is as follows: First, the PE particles are vacuum dried at 105-110℃ for 3.5-4 hours to remove surface moisture; The PE particles and DCP peroxide crosslinking agent are then thoroughly mixed together using a mixer to ensure that the DCP peroxide crosslinking agent is uniformly adhered to the surface of the PE particles. The mixer temperature is controlled at 50-60℃, the speed is 200-220r / min, and the mixing time is 7.5-8min. Next, a low-shear twin-screw extruder is used to granulate the PE particles coated with DCP peroxide crosslinking agent by melt extrusion. Then, the strips are cut into granules by the weak shear block on the extruder, and the temperature is controlled at 135-175℃. Finally, use cold water at 10-20℃ to quickly shape the granules to reduce internal stress and prevent the granules from yellowing and losing transparency. Then, use low-temperature hot air (temperature 50-60℃) to dry the granules.

[0040] The elastic transition layer 17 is made of modified butyl rubber, and the manufacturing steps are as follows: First, use an open mill to process the butyl raw rubber, and during the processing, use POE elastic modifier, control the time to 15-17 minutes, and control the temperature to 80-82℃; Then, the modified raw rubber obtained above is added to the internal mixer (temperature is 90-95℃), and zinc oxide activator and anti-ozone agent are added in sequence and mixed for 5-7 minutes. Then, fumed silica, silane coupling agent and paraffin oil plasticizer are added and vacuum mixed for 12-14 minutes. Finally, vulcanized resin is added and mixed for 3-4 minutes. Finally, the obtained intensively mixed rubber is transferred to a two-roll mill for multiple processing, with the roller temperature controlled at 70-72℃. The rubber sheet is then output and left to stand for 24 hours to release the internal stress from the mixing process.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An overhead insulated cable with an anti-icing coating, comprising a cable body (1) and connecting terminals (2), characterized in that: The end of the cable body (1) is provided with a tensile mechanism (3). The cable body (1) includes an aluminum alloy core (11) and a plurality of aluminum conductors (12). The surface of the aluminum alloy core (11) is provided with a conductive element, and the conductive element is composed of a plurality of aluminum conductors (12) twisted together. The tensile mechanism (3) includes multiple tensile ropes (31), and multiple arc ropes (39) are fixed between two adjacent tensile ropes (31). The cylindrical cage composed of multiple tensile ropes (31) and multiple arc ropes (39) is squeezed and fixed to the aluminum conductor (12) through the connecting terminal (2) and is axially straightened. It also includes two semicircular blocks (32), each of which has multiple protrusions (33) fixed on its inner wall. An inner ring (34) is provided between the outer surfaces of the two semicircular blocks (32). Multiple positioning grooves (35) are pre-set on the inner wall of the inner ring (34) and the outer surfaces of the two semicircular blocks (32). An outer ring (36) is sleeved on the inner ring (34). A connecting block (37) is fixed at one end of each semicircular block (32). Multiple extrusion blocks (38) are fixed on the inner wall of each outer ring (36). When the outer wall of the connecting terminal (2) is pressed, the outer ring (36), inner ring (34) and semicircular block (32) are linked together, and with the help of the protrusions (33) and connecting blocks (37), it can be used to counteract the secondary extrusion locking formed between the pull rope (31) and the aluminum conductor (12).

2. The overhead insulated cable with an anti-icing coating according to claim 1, characterized in that: One end of each of the tensile ropes (31) is located between two corresponding positioning grooves (35). When the outer wall of the connecting terminal (2) is deformed by pressure, it can be used to limit the connecting block (37). The surface of each of the protrusions (33) abuts against the surface of the aluminum alloy core (11). The aluminum alloy core (11) is located between two connecting blocks (37). The outer ring (36) is fixed inside the connecting terminal (2).

3. The overhead insulated cable with an anti-icing coating according to claim 1, characterized in that: The aluminum alloy core (11) is located between two semicircular blocks (32), the outer wall of the outer ring (36) is in contact with the inner wall of the connecting terminal (2), and the number of positioning grooves (35) on the inner ring (34) is twice the number of positioning grooves (35) on each semicircular block (32).

4. The overhead insulated cable with an anti-icing coating according to claim 1, characterized in that: The multiple curved ropes (39) and multiple tensile ropes (31) are made of polyester high-elastic industrial filaments with impregnation treatment, and the two are woven in a cross-weaving method to form a cylindrical cage.

5. The overhead insulated cable with an anti-icing coating according to claim 1, characterized in that: A water-blocking filler material (13) is provided between the aluminum alloy core (11) and the plurality of aluminum conductors (12). The water-blocking filler material (13) is composed of superabsorbent resin and polyester fiber, with a pH value of 6.5-7.5 and a unit weight of 3.2-5.9 g / m.

6. The overhead insulated cable with an anti-icing coating according to claim 5, characterized in that: The outer surface of the water-blocking filler material (13) is provided with a conductor shielding layer (14), which is made of cross-linked semi-conductive XLPE with a carbon black content of 25%-30% and a thickness of 0.8-1.0 mm.

7. The overhead insulated cable with an anti-icing coating according to claim 6, characterized in that: The outer surface of the conductor shielding layer (14) is provided with a weather-resistant inner layer (15). Each tensile rope (31) and each arc rope (39) is embedded inside the weather-resistant inner layer (15). The weather-resistant inner layer (15) is made of semi-transparent cross-linked polyethylene (XLPE), with a thickness of 1.2-1.5 mm and a density of 0.92-0.94 g / cm³. 3 The coefficient of linear expansion is 1.5-2.0×10⁻⁶. -4 / ℃.

8. The overhead insulated cable with an anti-icing coating according to claim 7, characterized in that: The outer surface of the weather-resistant inner layer (15) is provided with a weather-resistant outer layer (16), which is made of elastic modified XLPE, carbon black of 2.3%-2.5% and UV stabilizer, with a thickness of 1.5-2.0 mm and a density of 0.93-0.95 g / cm³. 3 The coefficient of linear expansion is 1.0-1.3×10⁻⁶. -4 / ℃.

9. The overhead insulated cable with an anti-icing coating according to claim 8, characterized in that: The outer surface of the weather-resistant outer layer (16) is provided with an elastic transition layer (17), which is made of modified butyl rubber, has a thickness of 0.5-0.8 mm, and a density of 0.95-1.05 g / cm³. 3 .

10. The overhead insulated cable with an anti-icing coating according to claim 9, characterized in that: The outer surface of the elastic transition layer (17) is provided with an anti-icing coating (18). The anti-icing coating (18) is a three-layer composite structure, consisting of a primer, an elastic intermediate coating, and a superhydrophobic topcoat. The primer material is a silane coupling agent with a thickness of 3-5 μm. The elastic intermediate coating material is a soft siloxane elastomer with a thickness of 20-40 μm. The superhydrophobic topcoat material is nano-silica with fluorocarbon and a thickness of 10-20 μm.

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