238 results about "Extrusion coating" patented technology

The invention relates to the technical field of PET optical films, and particularly discloses a high-light-transmittance blue-light-resistant PET optical film and a preparation method thereof, and the high-light-transmittance blue-light-resistant PET optical film is prepared from the following raw materials by weight: 70-85% of a polyethylene glycol terephthalate resin matrix; 3%-8% of a benzotriazole anti-blue light agent; 5%-12% of a silicon dioxide nano anti-reflection agent; 2%-6% of nano zinc oxide or nano cerium oxide; 1.5% to 4% of a polycarbodiimide cross-linking agent; 0.5%-3% of an anti-blocking agent; 0.4%-1.5% of an antioxidant; 0.4%-1.0% of an ultraviolet light absorber; the balance is a processing aid; the preparation method comprises the following steps: S1, pretreating the raw materials; s2, a mixing procedure; and S3, extruding and coating. The PET optical film provided by the invention has high optical properties of high light transmittance, blue light resistance and low haze, and has the advantages of high light transmittance and blue light blocking rate of the optical film and improvement of the application range of the optical film.

The invention relates to a composite cable, and relates to the technical field of cables, the composite cable comprises a conductor layer, a composite insulating layer, a waterproof layer, a weather-proof sheath layer and an armor layer from inside to outside in sequence, the conductor layer comprises at least six tinned copper conductors, the tinned copper conductors are symmetrically arranged in a regular hexagon shape, dielectric elastomers are filled among the conductors, and the dielectric elastomers are arranged between the tinned copper conductors. The composite insulating layer comprises an inner shielding layer, a main insulating layer and an outer shielding layer from inside to outside, the waterproof layer is a fluororubber extruded layer, the weather-proof sheath layer comprises a bonding transition layer and a weather-proof functional layer, and the armor layer is of a stainless steel band spiral wrapping structure. The composite cable can meet the requirement for high performance in a harsh environment and can show excellent performance under the extreme conditions of low voltage, large day and night temperature difference, strong ultraviolet rays, sand and dust abrasion, acid rain corrosion and the like.

The invention relates to a production system and a production method of a polyhydroxyalkanoate paper-plastic composite material. The production system comprises an unwinding mechanism, a coating device, a drying device, a pressing device, a winding mechanism and a post-processing device, wherein the unwinding mechanism is used for conveying base material paper; the coating device is used for coating the base material paper conveyed out by the unwinding mechanism and comprises an extrusion type coating machine head; the drying device is used for heating and drying the coated base material paper; the pressing device is used for pressing the dried base material paper; the winding mechanism is used for storing the laminated base material paper; and the post-processing device is used for performing post-processing on the laminated base material paper, and the post-processing device comprises an elastic roll mechanism and a drying box. According to the preparation method, an extrusion type coating process is adopted, extrusion granulation, high-temperature melt extrusion casting or film spraying forming of the polyhydroxyalkanoate is not needed, the degradation risk of the polyhydroxyalkanoate is avoided, degradation of the polyhydroxyalkanoate is reduced, and the production cost is reduced.

The utility model provides a device for wiping a slit extrusion coating die head lip. The device is mainly composed of a wiping mechanism and a moving mechanism. The wiping mechanism comprises flexible cloth, a material roller assembly and a limiting rod; the outer end of the flexible cloth is detachably installed at the driving end of the material roller assembly, the driven end of the material roller assembly is sleeved with the other parts of the flexible cloth, the two limiting rods are longitudinally arranged on the material roller assembly in parallel and located in a gap between the driving end and the driven end of the material roller assembly, and the ends, facing the flexible cloth, of the limiting rods are bent by a certain angle and are in an arc shape. The limiting rod is in contact with the flexible cloth to maintain the bending degree of the flexible cloth between the two limiting rods, and is matched with a lip of the slit extrusion coating die head; the movable end of the moving mechanism is connected with the material roller assembly and used for driving the material roller assembly in the three-axis direction. The die head lip is wiped in the winding and unwinding processes of the flexible cloth, damage to the die head lip is avoided, and the flexible cloth at the position of the die head lip is kept clean all the time.

A dual slot die coater including a lower slot and an upper slot, for extrusion coating of an electrode active material slurry on a surface of a continuously moving current collector. The dual slot die coater includes a lower plate, an intermediate plate positioned on the lower plate and an upper plate positioned on the intermediate plate, the lower slot being formed between the lower plate and the intermediate plate, and the upper slot being formed between the intermediate plate and the upper plate, wherein the lower plate, the intermediate plate and the upper plate have a lower die lip, an intermediate die lip and an upper die lip, each forming an front end with respect to the current collector, respectively, and a thickness of the lower die lip is larger than a thickness of the upper die lip and a thickness of the intermediate die lip.

The invention discloses a pipeline detection device and method based on phased array ultrasonic waves, and relates to the technical field of pipeline detection. The pipeline detection device based on phased array ultrasonic waves comprises a shell with an opening in the lower portion and a phased array ultrasonic detector installed in the shell, an arc-shaped filter plate is fixedly connected to the upper portion of a strip-shaped discharging groove in an embedded mode, and a scraping and collecting mechanism used for scraping and collecting a coated coupling agent in time after detection is completed is arranged on the right portion of an inner cavity of the shell. According to the invention, the coupling agent is uniformly coated on the surface of the pipeline in a thickness-constant manner through the self-extrusion coating mechanism, the consistency of acoustic impedance in a welding seam or a detection area is ensured, the stability of ultrasonic echo intensity is improved, and a detection blind area caused by coating missing is avoided, so that the detection accuracy and reliability are improved; couplant can be scraped and collected in time after detection, the retention time of the couplant on the surface of the pipeline is shortened, solidification residues are effectively prevented, and the surface quality of the pipeline is protected.

The invention relates to the technical field of power cables, and discloses a manufacturing process of a flame-retardant anti-rat-bite cable, which comprises the following steps: step S1, mixing and granulating in an inert atmosphere; step S2, conductor pretreatment; step S3, carrying out multi-layer co-extrusion coating; s4, gradient cooling and interface strengthening are carried out, and the co-extruded cable passes through a three-section type cooling tank in sequence to be cooled; and after cooling, carrying out electron beam irradiation crosslinking treatment on the cable immediately. The cable comprises a flame-retardant sheath layer, a long-acting rat-bite-proof layer, an insulating layer and a conductor from outside to inside. According to the invention, capsaicin is coated in a gelatin-Arabic gum composite capsule wall through a microencapsulation technology to form a physical isolation barrier, and the structure effectively prevents the contact between the repellent and the external environment, so that even in high-temperature mixing and long-term use, volatile components can be prevented from escaping, and the slow release period of the effective components is ensured to cover the design life of the cable.

The invention relates to the technical field of power cables, and particularly discloses a cable with a cable insulation layer and a preparation method thereof, and the cable comprises a conductor and an insulation layer wrapping the conductor. The preparation method comprises the following steps: S1, raw material pretreatment: preheating and softening the high-strength silicone rubber in a temperature interval of 120-150 DEG C; s2, a mixing procedure: adding an aluminum hydroxide flame retardant and ethylene-vinyl acetate copolymer resin into the pretreated high-strength silicone rubber; and S3, extruding and coating: applying the mixed composite material to the periphery of a conductor through an extruder, and controlling the extrusion temperature to be 140-170 DEG C. The cable can be used for power transmission in a high-temperature environment, and has the advantages that the flexibility and tear resistance are maintained in the high-temperature environment, and meanwhile, the long-term thermal stability is improved; in addition, the preparation method disclosed by the invention has the advantages of improving the compatibility of the filler and the matrix and improving the mechanical property of the cable.

The invention discloses an ultra-flexible cable for a high-voltage charging pile and a preparation method of the ultra-flexible cable, and aims to solve the problems that an existing cable for the high-voltage charging pile is insufficient in flexibility, short in bending-resistant service life and poor in signal stability under high voltage. The cable comprises a conductor, an insulating layer, a shielding layer, a signal line group and a sheath layer, the conductor is made of superfine oxygen-free copper wires through layered different-direction back-twist bunch stranding and compound stranding, and a flexible aramid fiber core is arranged in the center of the conductor. The insulating layer is of a TPU / TPE double-layer co-extrusion structure; the shielding layer adopts a composite structure of a semi-conductive elastomer extruded layer and a superfine silver-plated copper wire braid layer; the signal line groups are symmetrically arranged in a star shape; and the sheath layer is made of a nano modified TPEE material. The preparation method focuses on optimization of conductor stranding, double-layer co-extrusion, annealing treatment and tension control processes; the bending radius of the cable is less than or equal to 3D, the bending service life is long, the cable can bear 1000VDC high voltage and large current transmission, and the cable has excellent shielding effectiveness, wear resistance and weather resistance, and is suitable for high-frequency mobile scenes such as electric vehicle alternating current and direct current charging guns.

The invention discloses insulating layer extrusion coating equipment for cable processing, and relates to the technical field of cable processing, the insulating layer extrusion coating equipment comprises an equipment body, a frame is fixedly connected to the bottom surface of the equipment body, a supporting block is fixedly connected to one side of the top surface of the equipment body, and a control table is fixedly mounted on the surface of the supporting block; an injection molding extruder is fixedly connected to the top face of the supporting block, and a feeding pipe is fixedly connected to the surface of the injection molding extruder. The device further comprises a bundling assembly, a wrapping assembly and a winding assembly, the bundling assembly is arranged on the device body and used for integrating a plurality of cables, and the wrapping assembly is arranged in the middle of the device body and used in cooperation with the device body. The winding assembly is arranged on the equipment body and used for wrapping a cable with a conductive layer. The device is reasonable in structure, multiple groups of cables are integrated together through cooperative use of the bundling assembly and the wrapping assembly, then the multiple cables are wrapped with a conductive layer material through the winding assembly, and then the cables enter an injection molding extruder to be subjected to outer insulation layer wrapping work.

The present invention provides a cable insulation layer extrusion coating device and a coating method thereof, comprising an extruder, wherein the output end of the extruder is connected to a coating die, and further comprising a cooling pool, wherein a plurality of water spraying components are arranged inside the cooling pool, and the water spraying components include a tubular body, an annular rotating nozzle is arranged inside the tubular body, and a spiral component is arranged inside the rotating nozzle. According to the present invention, after water is passed into the water injection chamber, the water will be sprayed onto the coated cable surface through the annular rotating nozzle, and the sprayed water will converge into the annular rotating nozzle. The spiral component will drive the water in the annular rotating nozzle in a spiral manner under the drive of the annular rotating nozzle, so that the water can be spirally driven on the coated cable surface, making the flow direction of the water changeable, so that the water can evenly cover the surface of the cable, which is beneficial to avoid local overtemperature or cooling blind spots, and under the spiral drive of the spiral component, it is beneficial to increase the flow speed of the water.

The application discloses a cable extruder with waste material sorting structure, which comprises a guide frame, an extrusion coating die arranged on one side of the guide frame, an extrusion feeding mechanism arranged above the guide frame and used for feeding coating cable core raw materials to the extrusion coating die, a traction machine arranged on the one side of the guide frame and used for guiding cable feeding, a visual detection system arranged on the side of the traction machine away from the guide frame and used for detecting cable quality, a material sorting tank arranged on the side of the traction machine away from the guide frame, the material sorting tank comprising a waste tank and a finished product tank, a water tank arranged between the guide frame and the traction machine, and a linear module, the water tank being movably arranged above the material sorting tank through the linear module, and a cutting mechanism arranged on the side of the water tank away from the traction machine and used for cutting the cable.

The invention relates to the technical field of cable coating, in particular to a cable extrusion coating device and method, and the device comprises a core mold which is used for arranging a wire core in a penetrating manner; the split type outer mold is coaxially arranged outside the core mold in a sleeving mode, the split type outer mold is of an annular structure formed by splicing at least three arc-shaped modules in the circumferential direction, the inner side of each arc-shaped module is provided with a separation part extending in the radial direction, and the separation parts are attached to the outer surface of the core mold; a plurality of fan-shaped runners which are independently distributed in the circumferential direction are formed between the core mold and the split type outer mold; an adjusting mechanism; and a thickness monitor; wherein the driving unit responds to an electric signal of the thickness monitor and can independently control the throttling area and the melt pressure of the corresponding fan-shaped runner. The split type outer mold is formed by splicing a plurality of arc-shaped modules, each arc-shaped module is provided with an independent adjusting mechanism and a thickness monitor, cable eccentricity is monitored in real time and fed back and adjusted, circumferential pressure dynamic compensation is achieved, and the coaxiality of a coating layer is remarkably improved.

The invention provides a slit extrusion coating head and a method for preparing an HIPE (High Impact Polyethylene) foam material by using the same, the slit extrusion coating head comprises an upper die lip and a lower die lip, the upper die lip and the lower die lip are arranged in parallel and form an extrusion slit, and the roughness of the upper die lip and the roughness of the lower die lip are different. The slit extrusion coating head provided by the invention can be used for preparing the HIPE foam material with the gradient aperture through single-time extrusion, multi-layer compounding is not needed, the process is simple, and the cost is greatly reduced; the HIPE foam material with gradient aperture prepared by using the slit extrusion coating head provided by the invention can avoid the problem of interlayer separation existing in a multi-layer composite process.

The utility model discloses a slit extrusion die head mechanism, and mainly relates to the technical field of extrusion coating. Comprising a die head body, positioning carrier rollers and guide carrier rollers, an extrusion slit is formed in one side of the die head body, the positioning carrier rollers are arranged in parallel relative to the extrusion slit, positioning plates are arranged at the two ends of each positioning carrier roller respectively, adjusting seats are fixed to the sides, away from the die head body, of the positioning plates, and the sides, away from the die head body, of the adjusting seats are mounting surfaces. The die head comprises a die head body, a mounting face is arranged on the die head body, the mounting face is an inclined face inclining in the direction away from the die head body from bottom to top, an inserting groove extending in the length direction of the mounting face is formed in the mounting face, a sliding block sliding in the inserting groove and capable of being locked is arranged in the inserting groove, a moving block is fixed to the outer end of the sliding block, and shaft seats are arranged at the two ends of the guide carrier roller. And the shaft seat is fixed at the outer end of the moving block. The device has the beneficial effects that the tension and the running direction of a base material after coating can be better controlled, so that the coating stability is ensured.

Lignin pellets comprising fused lignin are described herein. The lignin pellets may further comprise a processing aid, and / or a surfactant, and / or a chemical modifying agent, and / or a compatibilizer and / or a thermoplastic polymer. An extrusion process for producing the lignin pellets and their use in the manufacture of lignin thermoplastic blend products, polyols, polyphenols, polyaromatics and polyurethanes is also disclosed herein. The extruded lignin pellet may be dry-blended with additional thermoplastic and / or additive and then directly processed using processes such as injection molding, compression molding, extrusion, extrusion coating, blowing, thermoforming, stamping, foaming, fiber drawing, calendering or rolling.

The invention provides an extrusion type coating head structure for silica gel film production, and belongs to the technical field of coating head structures, the extrusion type coating head structure comprises an upper die head and a lower die head arranged below the upper die head, and one end of the upper die head is provided with an upper die lip. According to the device, fluid is smoothly transited through the arc-shaped grooves formed in the corners, the situation that the speed of the fluid is suddenly reduced to form a low-speed retention area due to the corners is avoided, meanwhile, the fluid adhering to the arc-shaped grooves is scraped in cooperation with continuous rotation of a scraper, the fluid is prevented from being accumulated and solidified on an arc line, and therefore the flowing speed of the fluid is guaranteed; fluid at the corner is guided and pushed through the flow guide cover, the flowing speed of the fluid at the corner is increased, accumulation caused by too low flowing speed for a long time is avoided, and therefore the discharging speed of the fluid is increased, the flow guide groove is formed in one end of the arc-shaped groove, and the fluid can be guided to rapidly enter the position between the scraper and the flow guide cover when flowing along the inner wall; and the flowing speed of the fluid is further increased, and subsequent extrusion coating is helped to be better carried out.

The forms described herein include polymer blends comprising at least 90% by weight of low-density polyethylene (LDPE) polymer; and from 1% to 10% by weight of ethylene acrylate copolymer. The ethylene acrylate copolymer is the polymerized reaction product of: at least 50% by weight of ethylene, based on the total weight of monomers present in the ethylene acrylate copolymer; from 2% to 40% by weight of alkyl acrylate, based on the total weight of monomers present in the ethylene acrylate copolymer; and from 0% to 20% by weight of monocarboxylic acid monomer, based on the total weight of monomers present in the ethylene acrylate copolymer.

The invention discloses an intelligent UV film coating compound machine and a coating method.The intelligent UV film coating compound machine comprises a workbench, side plates are arranged on the two opposite sides of the workbench, a slit extrusion coating module is fixedly arranged between the two side plates, and a micro gravure coating module is arranged below the slit extrusion coating module; a first sliding groove is formed in each side plate, a rack is arranged below the first sliding groove of one side plate, a first center shaft is arranged in the center of the micro gravure coating module in a penetrating mode, and the two ends of the first center shaft are in sliding fit with the two first sliding grooves correspondingly; and the end, close to the rack, of the first center shaft is sleeved with a gear and connected with a power source, the gear is matched with the rack in a meshed mode, check blocks are arranged at the two ends of the first sliding groove, the opposite sides of the two check blocks are matched with the first center shaft, and the problem that the current UV film coating efficiency is low is solved through the device.

The invention relates to thermoplastic molding compositions based on semi-aromatic polyesters, which are particularly suitable for extrusion coating processes, in particular on paper substrates. The invention also relates to molded articles and films comprising the thermoplastic molding, in particular to coated articles. In another aspect, the invention relates to methods for producing thermoplastic molding compositions and to extrusion methods using these thermoplastic molding compositions. The invention also relates to a packaging material comprising a coated article coated with a thermoplastic molding composition according to the invention.

The utility model relates to the technical field of pit and fissure sealing agent smearing, and particularly discloses a pit and fissure sealing agent extrusion coating device which comprises a main body, the main body is arranged to be a hollow cylindrical shell, and friction blocks are continuously arranged on the surface of the main body; a sliding rod is embedded in one side of the surface of the body, one side of the sliding rod is inserted into the body and connected with a rubber block, and one side of the sliding rod is connected with a connecting block. According to the extrusion coating device for the pit and ditch sealing agent, the plugging block and the connecting rope are arranged, the plugging block is pulled outwards so that the plugging block can be taken out from the interior of the feeding port, at the moment, the pit and ditch sealing agent can be added according to the discharging port, feeding of the pit and ditch sealing agent is facilitated, and the use convenience of the device is improved; when the friction block extrudes the pit and groove sealing agent, the pit and groove sealing agent flows to the outlet pipe more smoothly, residues of the sealing agent in the main body are reduced, the utilization rate of the sealing agent is increased, and waste is avoided.

The present invention provides a method for coating a safety layer slurry on a battery positive electrode sheet and a battery positive electrode sheet. The method for coating a safety layer slurry on a battery positive electrode sheet includes preparing a safety layer slurry, extrusion coating, and baking. The safety layer slurry preparation comprises uniformly mixing a safety solute and a binder, gradually adding a solvent in two or more portions and stirring at high and low speeds to achieve a solution with a solid content of 3-8% and a viscosity of 50-200 cP. The extrusion coating utilizes a multi-layer extrusion die, wherein an active material layer slurry is coated between a foil to be coated and the safety layer slurry, the distance between the coating die and the active material layer is 50-130 μm, and the thickness of a gasket at the safety layer slurry outlet is 0.1-0.3 mm. The present invention improves the solid content and viscosity of the safety layer slurry, the coating die gap, and the thickness of the gasket, so that the safety layer coated by this method can have a thin thickness and good safety without affecting the energy density of the electrode sheet.

A multi-cavity extrusion coating head comprises a lower die head, the lower die head is provided with at least two slurry cavities for independent feeding, and the at least two slurry cavities are sequentially arranged in the length direction of the lower die head and isolated from each other; the upper die head is arranged on the lower die head and is connected with the lower die head; the gasket is arranged between the upper die head and the lower die head, and a coating outlet suitable for coating is formed at an opening of the upper die head and an opening of the lower die head; the upper die head comprises upper die branch heads of which the number is equal to that of the slurry cavities; the gasket comprises gasket sub-sheets with the same number as the slurry cavities; and each upper die sub-head corresponds to one gasket sub-sheet and is independently arranged on the lower die head where one slurry cavity is located, so that an independent coating sub-outlet is formed. The utility model has the advantage of convenience in maintenance.

The invention discloses a self-repairing anti-twisting shielding composite cable, and relates to the technical field of cables, the self-repairing anti-twisting shielding composite cable comprises a conductor, an insulating layer, a shielding layer and an outer sheath which are sequentially sleeved from inside to outside, and the insulating layer and / or the outer sheath are / is obtained by extruding a self-repairing polyurethane elastomer; the self-repairing polyurethane elastomer is prepared from the following components in parts by weight: 100 parts of soft-segment polyol, 40 to 80 parts of isophorone diisocyanate, 12 to 20 parts of a chain extender containing disulfide bonds and 5 to 12 parts of a chain extender containing ureido, and the soft-segment polyol is selected from at least one of polytetrahydrofuran ether glycol and amino-terminated polydimethylsiloxane. The self-repairing anti-twisting shielding composite cable is high in self-repairing capacity, excellent in anti-twisting performance and stable in shielding performance.

A polymeric film, sheet, or extrusion coating is formed as a multilayered structure having at least one A layer and at least one B layer. The polymeric film, sheet, or extrusion coating is able to include at least 30% recycled content resin while also exhibiting improved stiffness and strength relative to films with purely virgin polymers. One embodiment of the present invention further presents improved oxygen barrier properties relative to existing films, sheets, or extrusion coatings. Due to the strong structural properties, the polymeric film, sheet, or extrusion coating allows for the inclusion of recycled content into applications where recycled content has previously not been able to be included, such as flexible food, pharmaceutical, or cosmetics packaging.

The application discloses a cross-linking vulcanization process for new energy cable production and relates to the technical field of new energy cable production.The process comprises the preparation and pretreatment of raw materials, the extrusion coating of a conductor to form an insulation layer, the cutting of the cable, a hot vulcanization reaction, cooling and shaping, post-treatment and detection; the process is good in sealing, so that gaseous by-products generated during the cross-linking of peroxides cannot escape, the cross-linking is relatively uniform, and proper pressure ensures that the insulation layer is in close contact with the mold, so that the cross-linking degree is consistent, the conductor of the cable is not damaged, the sealing state in the placement hole can be switched, or the cable is fixed in a fixed sleeve, the ends of two cable sections are fixed in the fixed sleeve, the cable head and the cable tail are fixed by the fixed sleeve, the cable is prevented from being deformed during the process, the insulation skin of the cable in the placement hole is ensured, and efficient and stable cross-linking reaction of the new energy cable can be realized.

The utility model discloses an adjustable gasket for a slit type extrusion coating machine, which comprises a fixed gasket body provided with a first through hole; the left side gasket body is vertically arranged on one side of the fixed gasket body and is provided with a second through hole; the right side gasket body is vertically arranged on the other side of the fixed gasket body and is provided with a third through hole; the first adjustable gasket body is movably arranged above the gasket body on the left side; the second adjustable gasket body is movably arranged above the right side gasket body; the thickness of the fixed gasket body, the thickness of the left side gasket body, the thickness of the right side gasket body, the thickness of the first adjustable gasket body and the thickness of the second adjustable gasket body are equal. By means of the mode, the gasket does not need to be disassembled frequently every time when models are replaced, only the position of the adjustable gasket body needs to be changed, the model switching time is effectively shortened, the gasket does not need to be replaced integrally, the number of jigs needed for model replacement is not too large, and the design cost is effectively reduced.

This utility model relates to the field of electric wire and cable production technology, and in particular to an extrusion coating device for electric wire and cable. This device allows the electric wire and cable to be coated with different materials sequentially during its movement, thereby forming a multi-layer composite structure in a single processing cycle, effectively improving production efficiency and the bonding strength of the coating layers. The extrusion mold is equipped with a thickness control component, including horizontally movable left and right adjustable die lips, which can precisely adjust the size of the discharge hole, ensuring the uniformity and adjustability of the coating thickness to meet the processing needs of electric wire and cable of different specifications. Furthermore, the design of the conical injection channel and stepped transition surface optimizes the flow distribution of the molten material, reducing turbulence and bubble generation, and improving the coating quality. The combined use of the guide sleeve and positioning component accurately guides the electric wire and cable into the extrusion cavity, preventing deviation and ensuring the symmetry and consistency of the coating layers. The overall structure is compact, easy to operate, suitable for continuous production, and has high practicality and economy.

The utility model provides a high mechanical strength insulation radio frequency coaxial cable, including inner conductor, insulating layer, shielding layer, inner sheath layer, composite armor layer and oversheath layer, the insulating layer is provided outside the inner conductor, the shielding layer wraps the insulating layer, the inner sheath layer is extruded outside the shielding layer, the composite armor layer is provided outside the inner sheath layer, and the outer sheath layer is provided with the outer sheath layer. An outer sheath layer is extruded and formed outside the composite armor layer; the composite armor layer is additionally arranged, so that the mechanical strength of the cable is greatly improved. And the composite armor layer is formed by spirally wound composite armor wires, so that the tensile resistance, the distortion resistance and the external impact resistance are enhanced. The armored wire is combined with the heat capacity layer and the metal wire harness, and the metal wire harness is formed by twisting metal wires with the same diameter, so that the strength and the stability are ensured. And the heat capacity layer is extruded outside the metal wire harness, so that the binding force is enhanced, a tight whole is formed after heating, and the performance is further improved. The cross section of the heat capacity layer is designed to be circular, spiral grooves are naturally formed, cable bending and twisting are facilitated, and flexibility is improved.

The utility model discloses a steel-plastic conversion pipe fitting manufactured by extruding and coating a 3PE anti-corrosion steel pipe, which comprises a 3PE anti-corrosion steel pipe fitting and a PE plastic part, the outer wall of the 3PE anti-corrosion steel pipe fitting is provided with a plurality of conical inverted tooth structures, and the inner wall of the PE plastic part is embedded into the conical inverted tooth structures. The 3PE anti-corrosion steel pipe fitting is arranged on the outer surface of the seamless steel pipe body, a plastic-coated locking ring is arranged at the joint of the PE anti-corrosion steel pipe fitting and the 3PE anti-corrosion steel pipe fitting in a sleeved mode to form a steel-plastic conversion pipe fitting, the plastic-coated locking ring comprises a steel locking ring, and a polypropylene coating layer is arranged on the outer portion of the steel locking ring, and the 3PE anti-corrosion layer is arranged on the outer surface of the seamless steel pipe body, so that the 3PE anti-corrosion steel pipe is stable in anti-corrosion performance. And the plastic-coated locking ring is provided with the polypropylene coating layer, so that the plastic-coated locking ring has good corrosion resistance, the corrosion resistance of the steel-plastic conversion pipe fitting is excellent, and the corrosion speed of a pipeline is slowed down.