Coextrusion equipment and process for foamed FEP (fluorinated ethylene propylene) and conductor

Abstract

The invention relates to a foamed FEP and conductor co-extrusion device and process, the foamed FEP and conductor co-extrusion device comprises a wire processing mechanism, a co-extrusion die is arranged behind the wire processing mechanism, and the co-extrusion die is in butt joint with an extrusion mechanism and a cooling assembly; the wire processing mechanism comprises a rack, a plurality of rollers and a roller are arranged in the middle of the rack, a conveying belt is arranged below the roller, and a dust sticking pad is arranged on the roller; a wire through hole is formed in the middle of the co-extrusion die, a pressure adjusting mechanism is arranged in the co-extrusion die and comprises a valve body, a valve element is arranged in the valve body, an adjusting rod is connected to the valve element, the outer end of the adjusting rod is sleeved with a reset spring, a gear is arranged on the inner wall of the co-extrusion die and meshed with a rack, one end of the rack is in butt joint with the adjusting rod, and the other end of the rack is in butt joint with the reset spring. A rotating wheel is arranged on the gear, the wire penetrates through the rotating wheel, the valve body is in butt joint with a flow dividing plate, a plurality of flow dividing openings are formed in the flow dividing plate and located in the wire through hole, and a scraper is arranged at an outlet of the wire through hole. The equipment provided by the invention can improve the bonding uniformity of the foamed FEP and the conductor.

Description

Technical Field

[0001] The present invention relates to the technical field of cable manufacturing, and in particular to a co-extrusion device and process for foamed FEP and a conductor. Background Art

[0002] With the rapid development of electronic technology, the demand for high-frequency and high-speed transmission cables is growing. As a low-dielectric-constant, low-loss insulating material, the cables made by co-extrusion of fluoroethylene propylene (FEP) and conductors are widely used in communications, radar and other fields.

[0003] However, in the existing co-extrusion process of foamed FEP and conductors, the mold design is usually relatively simple, resulting in poor bonding uniformity between the FEP foam layer and the conductor, affecting the electrical and mechanical properties of the final product. On the one hand, the uneven bonding can easily cause the foamed FEP layer to partially fall off or create an air gap between it and the conductor, increasing signal loss during high-frequency transmission; on the other hand, the uneven distribution of the foamed FEP can easily lead to local stress concentration and reduce the service life of the cable. Therefore, it is urgent to develop a new co-extrusion equipment and process to optimize this problem. Summary of the invention

[0004] The object of the present invention is to provide a co-extrusion device and process for foamed FEP and a conductor, wherein the device can straighten and remove dust from the conductor before the conductor is co-extruded, and can control the combination rate of the foamed FEP and the conductor according to the output speed of the conductor, and can also control the combination rate of the foamed FEP and the conductor by an electric push rod.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a co-extrusion device of foamed FEP and conductor, characterized in that it includes a wire processing mechanism, a co-extrusion mold is arranged at the rear of the wire processing mechanism, and the co-extrusion mold is connected with an extrusion mechanism and a cooling component; the wire processing mechanism includes a frame, a plurality of rotatable rollers and drums are arranged in the middle of the frame, a conveyor belt is arranged under the drum, and a sticky pad is arranged on the drum; a wire through hole is arranged in the middle of the co-extrusion mold, and a pressure regulating mechanism is arranged in the co-extrusion mold, which includes a valve body, a valve core is arranged in the valve body, an adjusting rod is connected to the valve core, a reset spring is sleeved on the adjusting rod, a gear is arranged on the inner wall of the co-extrusion mold, a rack is meshed on the gear, one end of the rack is connected with the adjusting rod, a runner is connected to the gear, an output port and an input port are arranged on the valve body, the output port is connected with a diverter plate, a diverter port is arranged on it, the diverter port is located in the wire through hole, and a scraper is arranged at the outlet of the wire through hole;

[0006] The extrusion mechanism comprises a barrel, the barrel is connected with a discharge pipe, the discharge pipe is connected with the input port of the valve body, an electric push rod is arranged on the discharge pipe, the electric push rod is connected with a pressing plate, and the pressing plate is located in the discharge pipe.

[0007] Furthermore, two extrusion mechanisms are butt-jointed at the rear and side of the co-extrusion die. The extrusion mechanisms are symmetrically distributed along the central axis of the co-extrusion die, and the cooling mechanism is located in the middle of the extrusion mechanisms.

[0008] Furthermore, the frame is composed of a baffle and a bottom plate, a mounting shaft is arranged in the middle of the baffle, the roller is sleeved on the mounting shaft, there is a certain distance between the roller and the conveyor belt, and the distance is adjustable.

[0009] Furthermore, a central axis passes through the middle of the drum, a straight groove is provided on the baffle, the central axis is clamped in the straight groove, and adjusting bolts are provided at both ends of the central axis. The adjusting bolts are inserted from above the baffle and pass through the straight groove.

[0010] Furthermore, a fixed shaft is provided at the center of the gear, a sleeve is sleeved on the fixed shaft, the sleeve is connected to the rotating wheel, a semicircular groove is provided on the rotating wheel, the rotating wheel is located in the wire through hole, the rack is located above the gear, and a convex tooth section and a straight bar section are provided on the rack.

[0011] Furthermore, a funnel-shaped feed hopper is provided at one end of the barrel, a metering device and a drying device are installed on the feed hopper, a heating ring is provided on the outer wall of the barrel, a screw is provided inside the barrel, and a drive motor is connected to one end of the screw.

[0012] Furthermore, the cooling component includes a water tank, a nozzle is arranged above the water tank, a pipe is connected to the nozzle, and a valve is arranged in the middle of the pipe.

[0013] The present invention adopts the following technical solution: comprising the following steps:

[0014] S1: Preparation of FEP raw materials: First, the FEP raw materials are cleaned and dried to remove water, and the extrusion mechanism is preheated and debugged, the appropriate temperature of each section is set, and the screw speed and other parameters are adjusted. Then, the FEP raw materials, the weighed foaming agent and the FEP resin are evenly mixed and added to the extrusion mechanism;

[0015] S2: Wire processing: Place the wire coil on the pay-off mechanism, and fix the wire head on the traction device. The wire passes through the wire processing mechanism, and its surface is cleaned and straightened by the wire processing mechanism to meet the requirements;

[0016] S3: Co-extrusion molding: After the conductor passes through the conductor processing mechanism, it passes through the conductor through-hole of the co-extrusion die and is pulled out of the co-extrusion die at a uniform speed by the traction device. At the same time, the extrusion mechanism extrude the foamed FEP material, and it flows into the conductor through-hole through the manifold and evenly adheres to the conductor. During this process, the flow rate of the foamed FEP is controlled by the pressure regulating mechanism to ensure that the foamed FEP material is extruded evenly and the flow rate is stable, so as to achieve bonding with the conductor;

[0017] S4: Cooling and winding: The co-extruded product of foamed FEP and conductor enters the cooling water tank after being output from the conductor through-hole. The heat of the product is quickly taken away by the cold water to solidify the product structure. The cooled product is pulled forward at a uniform speed by the traction device, and finally, it is neatly wound into a roll by the winding device.

[0018] Further, S1: FEP raw material preparation: drying the FEP resin, baking it in a vacuum oven at an appropriate temperature (e.g., 120-150° C.) for several minutes to remove moisture and prevent defects such as bubbles from being generated during processing, the foaming agent used is azodicarbonamide, and the mixing time of the foaming agent and the dried FEP raw material is controlled to be 10-20 minutes;

[0019] S2: Wire processing: The conductor material is copper. Before being placed in the wire-releasing mechanism, the wire is drawn and the oil stains on its surface are processed. Since the wire is in a coiled shape, there is dust on its surface, so it needs to be straightened and the surface dust is processed;

[0020] S3: Co-extrusion: During the co-extrusion process, the wire through-hole and the scraper can shape the product. The scraper can adjust the size. At the same time, the speed of the traction device is controlled to ensure that the wire and the controlled foaming FEP are evenly combined.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the wire is passed through the wire processing mechanism of the equipment, the wire is straightened by rollers and drums, and the dust on the surface of the wire is removed, and then the wire is passed through the wire through-hole of the co-extrusion mold. At the same time, the processed FEP material is added to the feed hopper of the extrusion mechanism, and the drive motor is operated to drive the screw to rotate, and the FEP material is conveyed along the barrel by the screw. In this process, the FEP material is plasticized by the heating ring, and it is conveyed to the discharge pipe as the screw rotates. The electric push rod can control the foamed FEP to flow to the pressure regulating mechanism, thereby controlling its combination speed with the wire. In addition, the wire can pass through the rotating wheel and move continuously, driving the rotating wheel and the gear to rotate synchronously, so that the valve core and the valve body of the pressure regulating mechanism are separated through the meshing relationship between the gear and the rack, and the flow rate of the foamed FEP is controlled. The pressure regulating mechanism can make the foamed FEP flow to the diverter plate at a uniform speed, and make it evenly combined with the wire through the diverter plate. Subsequently, the co-extruded cable is cured by the cooling component.

[0022] The present invention can straighten and remove dust from the wire to avoid the influence of impurities, and improve the efficiency of combining the wire with the foamed FEP. The flow rate of the foamed FEP can be controlled according to the output speed of the wire, and the flow rate of the foamed FEP can also be controlled by the electric push rod and the pressure regulating mechanism, so as to improve the efficiency of combining the wire with the foamed FEP and improve the production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of a top view of the overall structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the wire processing mechanism of the present invention;

[0026] Figure 4 It is a schematic diagram of the connection relationship between the co-extrusion die, the extrusion mechanism and the cooling mechanism of the present invention;

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the co-extrusion die of the present invention;

[0028] Figure 6 It is a schematic structural diagram of point A (cross-sectional view of the pressure regulating mechanism) of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the B part (discharging pipe and extrusion mechanism cross-section diagram) of the present invention;

[0030] Figure 8 It is a schematic diagram of the connection relationship between the gear and the wheel of the present invention;

[0031] Among them, 101-frame, 102-wire inlet, 103-wire outlet, 104-installation shaft, 105-roller, 106-conveyor belt, 107-roller, 108-center shaft, 109-straight groove, 110-adjusting bolt, 111-stepping motor, 201-coextrusion die, 202-wire through hole, 203-coextrusion die seat, 204-valve body, 205-valve core, 206-adjusting rod, 20 7-reset spring, 208-gear, 209-rack, 210-fixed shaft, 211-sleeve, 212-rotor, 213-diverter plate, 214-scraper, 301-barrel, 302-feed hopper, 303-heating coil, 304-screw, 305-drive motor, 306-discharge pipe, 307-electric push rod, 308-pressing plate, 309-water tank, 310-nozzle, 311-pipeline. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various configurations. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention. In the embodiments, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be an electrical connection; it can be a hydraulic oil circuit connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] Reference Figure 1-8 The present invention discloses a new co-extrusion device and process for foamed FEP and conductor, including a wire processing mechanism, which can straighten the wire and remove dust on the surface of the wire, thereby improving the combination efficiency of the wire and the foamed FEP material. A co-extrusion component is arranged at the rear end of the wire processing mechanism, and the foamed FEP material (fluoroethylene propylene copolymer) is extruded in the co-extrusion die 201 according to the design requirements, and is coated around the wire to form the outer structure of the cable. An extrusion mechanism is docked at the side and rear of the co-extrusion die 201, and the extrusion mechanism can heat and plasticize the FEP material, and extrude it through the co-extrusion die 201 at a certain pressure and speed. A cooling mechanism is arranged at the rear end of the co-extrusion die 201, and the cooling mechanism quickly solidifies and shapes the extruded cable by cooling.

[0035] The wire processing mechanism includes a frame 101, which is composed of a bottom plate and two parallel baffles. The bottom plate is vertically fixedly connected to the bottom of the two baffles. A circular wire outlet 103 and a wire inlet 102 are respectively arranged at both ends of the frame 101. A plurality of mounting shafts 104 are linearly distributed along the length direction of the two baffles. The mounting shafts 104 are located between the wire inlet 102 and the wire outlet 103 and are vertically fixedly connected to the baffles. A circular roller 105 is sleeved in the middle of each mounting shaft 104. The roller 105 can rotate on the mounting shaft 104. A semicircular wire groove matching the shape of the wire is arranged on the outer wall of the roller 105. After the wire enters from the wire inlet 102, it will pass through the wire grooves of the plurality of rollers 105 in sequence. And under the rotation of the plurality of rollers 105, the wire is straightened to eliminate the possible bending or twisting of the wire.

[0036] In addition, a conveyor belt 106 is arranged in the middle position of the frame 101, and rotating shafts are installed at both ends of the conveyor belt 106. A stepper motor 111 is docked on one of the rotating shafts. A plurality of rollers 107 are arranged above the conveyor belt 106. The rollers 107 are linearly distributed along the length direction of the conveyor belt 10. There is a certain distance between the rollers 107 and the conveyor belt 106, and the distance can be adjusted. Specifically, a central axis 108 passes through the middle of each roller 107, and the roller 107 can rotate on the central axis 108. Straight grooves 109 are provided on the baffles on both sides of the frame 101, and the central axis 108 is stuck in the straight grooves 109. Adjustment bolts 110 are provided at both ends of the central axis 108. The baffle is provided with threaded holes. The adjustment bolts 110 pass through the threaded holes of the baffle and enter the straight grooves 109 and are connected to the central axis 108. The adjustment bolts 110 can vertically adjust the distance between the roller 107 and the conveyor belt 106. The adjustment bolts 110 are screwed with nuts, which are stuck on the baffles. The adjustment bolts are fixed to the baffles through the nuts. A sticky pad is installed on the circumferential surface of each roller 107. The wire can pass between the conveyor belt 106 and the roller 107. When the wire passes through, the roller 107 rotates to contact the surface of the wire, and the dust on the surface of the wire is stuck to the sticky pad. The processed wire can enter the co-extrusion component and be combined with the foamed FEP material.

[0037] The co-extrusion die 201 is cylindrical in shape as a whole, and its inner wall has a certain thickness. Some spaces are provided on the co-extrusion die 201. A wire through hole 202 is passed through the middle of the co-extrusion die 201. The wire through hole 202 is a circular hole, and the wire can pass through the wire through hole 202. The co-extrusion die 201 is installed on a rectangular co-extrusion die base 203, and the co-extrusion die base 203 is used to support and fix the co-extrusion die 201. Two extrusion mechanisms are docked on both sides of the rear end of the co-extrusion die 201, and the extrusion mechanisms are symmetrically distributed along the central axis 108 of the co-extrusion die 201.

[0038] The extrusion mechanism includes a barrel 301, which is a long cylindrical structure as a whole. A funnel-shaped feed hopper 302 is arranged at one end of the barrel 301. The opening of the feed hopper 302 is upward, and the processed FEP material can be poured into the feed hopper 302. The feed hopper 302 is equipped with a metering device and a drying device. The metering device is used to control the feeding amount of the material, and the drying device is used to remove the moisture in the material to ensure the quality of the material. A heating coil 303 is arranged on the outer wall of the barrel 301. The heating coil 303 is wound around the outside of the barrel and is used to heat the material in the barrel 301 so that the FEP material reaches the plasticizing temperature. A screw 304 is arranged inside the barrel 301. From the feeding end to the discharging end of the barrel 301, it can be divided into a feeding section, a compression section and a homogenization section. The screw groove of the feeding section is deep, used to transport the material from the feed hopper 302 to the compression section; the screw groove of the compression section gradually becomes shallower, compressing and preheating the material; the screw groove of the homogenization section is shallow and uniform in depth, so that the material is further uniformly plasticized and mixed. A drive motor 305 is provided at one end of the barrel 301, and the drive motor 305 is connected to the screw 304 to drive the screw 304 to rotate. A discharge pipe 306 is connected to the end of the barrel 301. The discharge pipe 306 is an L-shaped two-way pipe, and its other end is connected to the co-extrusion mold 201.

[0039] Two pressure regulating mechanisms are arranged in the inner wall of the co-extrusion die 201, and the two pressure regulating mechanisms are connected to the two extrusion mechanisms respectively. The pressure regulating mechanism includes a valve body 204, and the valve body 204 is provided with an output port and an input port, and the input port of the valve body 204 is connected to the discharge pipe 306. Under the action of pressure, the foamed FEP material in the barrel 301 can flow into the inlet position of the valve body 204 through the discharge pipe 306. A valve core 205 is arranged inside the valve body 204, and the valve core 205 is tightly fitted with the valve body 204. The valve core 205 can move in the valve body 204. An adjusting rod 206 is connected to one end of the valve core 205, and one end of the adjusting rod 206 extends from the valve body 204 and can move with the valve core 205. The outer end of the adjusting rod 206 is sleeved with a return spring 207, and the return spring 207 is fixedly connected to the valve core 205. The return spring 207 can be pressure-regulated by the adjusting rod 206. A plurality of gears 208 are arranged on the inner wall of the co-extrusion die 201, and a fixed shaft 210 is arranged at the center of each gear 208. The fixed shaft 210 is vertically fixed on the inner wall of the co-extrusion die 201, and the gear 208 can rotate on the fixed shaft 210. A sleeve 211 is sleeved on the fixed shaft 210, and a rotating wheel 212 is connected to the other end of the sleeve 211. The rotating wheel 212 is provided with a semicircular groove matching the shape of the wire. A part of the rotating wheel 212 is located in the wire through hole 202, and the wire passes through the groove. A rack 209 is meshed on the gear 208, and the rack 209 is provided with a convex tooth segment and a straight bar segment, and one end of the rack 209 is connected to the adjusting rod 206.

[0040] Reference Figure 7 As described, in the initial state, the valve core 205 cooperates with the return spring 207 to seal the valve body 204 to prevent the foamed FEP from flowing down. When the wire passes through the wire through hole 202 from left to right, the wire contacts the groove of the rotating wheel 212. At this time, the wire is in close contact with the rotating wheel 212, and the wire is in a taut state. A support wheel (an optional component, not shown in the figure) can be set below the rotating wheel 212. The thickness of the support wheel is smaller than the width of the groove of the rotating wheel 212. A rubber layer is attached to the circumferential surface of the support wheel and the rotating wheel 212. At this time, the wire is located in the groove of the rotating wheel 212 and is clamped by the rotating wheel 212 and the support wheel. As the wire moves, the rotating wheel 212 and the support wheel also rotate counterclockwise.

[0041] In order to ensure the rotation of the rotating wheel 212, a motor can be installed at the rear end of the rotating wheel 212. When the rotating wheel 212 rotates, it can drive the gear 208 to rotate counterclockwise, and the gear 208 meshes with the convex tooth segment on the rack 209, and drives the rack 209 to move leftward, thereby driving the valve core 205 to move leftward and compressing the return spring 207 to the left. The valve core 205 is separated from the inner wall of the valve body 204, and at this time, the foamed FEP can smoothly flow through the valve body 204 and flow out from the output port of the valve body 204. It should be noted that, during the movement of the wire, the gear 208 rotates to mesh with the convex tooth segment on the rack 209 and moves the rack 209 to the left. When the rack 208 moves to the straight segment on the rack 209, it cannot form a meshing relationship with the gear 208, and the rack 209 cannot continue to move. At this time, the rack 209 is at the far left end and cannot move to the right because the gear 208 keeps rotating. The return spring 207 is just compressed to the maximum. When the wire stops moving or the moving speed slows down, the return spring 207 can release the pressure and drive the valve core 205 to move to the right, so that the valve body 204 is sealed or the opening becomes smaller, ensuring that the output speed of the wire matches the flow rate of the foamed FEP.

[0042] In addition, an electric push rod 307 is provided at the corner of the discharge pipe 306. The electric push rod 307 is perpendicular to the barrel 301. The output shaft of the electric push rod 307 extends into the discharge pipe 306, and the pressing plate 308 is docked at the top of the output shaft of the electric push rod 307. The pressing plate 308 is circular and fits the inner wall of the discharge pipe 306. When the electric push rod 307 drives the pressing plate 308 to move downward, downward pressure can be applied to the foamed FEP in the discharge pipe 306 so that it can flow to the pressure regulating mechanism. At the same time, the speed of the foamed FEP flowing into the pressure regulating mechanism can also be compressed by the electric push rod 307. When the electric push rod 307 applies pressure to the foamed FEP, the foamed FEP flows into the valve body 204 under the action of pressure, and pushes the valve core 205 to the left, and compresses the return spring 207 to the left, so that the valve core 205 is separated from the inner wall of the valve body 204. At this time, the foamed FEP can also flow through the valve body 204.

[0043] A T-shaped flow divider 213 is connected to the outlet of the valve body 204. The flow divider 213 is provided with a plurality of flow dividers, which are located in the wire through hole 202. The flow divider 213 can evenly divide the foamed FEP on the wire, so that the wire and the foamed FEP are evenly combined. A conical scraper 214 is provided at the outlet of the wire through hole 202. When the wire combined with the foamed FEP passes through the scraper 214, the foamed FEP attached to the surface of the wire can be further evenly processed.

[0044] A cooling component is connected to the rear end of the co-extrusion component, and the cooling component is closely connected to the outlet of the co-extrusion component. The cooling component includes a semicircular water tank 309, and a plurality of nozzles 310 are arranged above the water tank 309. The nozzles 310 are arranged linearly along the length direction of the water tank 309. The nozzles 310 are connected to the nozzles 310 with nozzle pipes 311, and the pipes 311 are connected to the water tank. A valve is provided in the middle of the pipe 311, and the nozzles 310 are controlled by the valve to spray water into the water tank 309. The co-extruded cables pass through the water tank 309 and are cooled and formed under the action of water.

[0045] Embodiment: The operator needs to pass the wire through the wire inlet 102 of the wire processing mechanism, straighten the wire through the roller 105 and the roller 107, and remove the dust on the surface of the wire, and then pass the wire through the wire through the wire through hole 202 of the co-extrusion die 201. At the same time, add the processed FEP material into the feed hopper 302 of the extrusion mechanism, operate the drive motor 305 to drive the screw 304 to rotate, and the FEP material is transported along the barrel 301 through the screw 304. In this process, the heating ring 303 plasticizes the FEP material and conveys it to the discharge pipe 306 as the screw 304 rotates. The electric push rod 307 can control the foamed FEP to flow to the pressure regulating mechanism, thereby controlling the speed of its combination with the wire. In addition, the wire can pass through the runner 212 and move continuously, driving the runner 212 and the gear 208 to rotate synchronously, so that the valve core 205 of the pressure regulating mechanism is separated from the valve body 204 through the meshing relationship between the gear 208 and the rack 209, and the flow rate of the foamed FEP is controlled. The pressure regulating mechanism can make the foamed FEP flow to the diverter plate 213 at a uniform speed, and make it evenly combine with the wire through the diverter plate 213. Subsequently, the co-extruded cable is cured by the cooling component.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A co-extrusion device for foamed FEP and conductor, characterized in that: It includes a wire processing mechanism, a co-extrusion die is arranged at the rear of the wire processing mechanism, and the co-extrusion die is connected with an extrusion mechanism and a cooling component; The wire processing mechanism comprises a frame, a plurality of rotatable rollers and drums are arranged in the middle of the frame, a conveyor belt is arranged under the drum, and a sticky dust pad is arranged on the drum; A wire through hole is provided in the middle of the co-extrusion die, and a pressure regulating mechanism is provided in the co-extrusion die, which includes a valve body, a valve core is provided in the valve body, an adjusting rod is connected to the valve core, a reset spring is sleeved on the adjusting rod, a gear is provided on the inner wall of the co-extrusion die, a rack is meshed on the gear, one end of the rack is connected to the adjusting rod, a runner is connected to the gear, an output port and an input port are provided on the valve body, a diverter plate is connected to the output port, a diverter port is provided on the diverter plate, the diverter port is located in the wire through hole, and a scraper is provided at the outlet of the wire through hole; The extrusion mechanism comprises a barrel, the barrel is connected with a discharge pipe, the discharge pipe is connected with the input port of the valve body, an electric push rod is arranged on the discharge pipe, the electric push rod is connected with a pressing plate, and the pressing plate is located in the discharge pipe.

2. The co-extrusion device of foamed FEP and conductor according to claim 1, characterized in that: The co-extrusion die is butt-jointed with two extrusion mechanisms at the rear and side thereof. The extrusion mechanisms are symmetrically distributed along the central axis of the co-extrusion die, and the cooling mechanism is located in the middle of the extrusion mechanisms.

3. The co-extrusion device of foamed FEP and conductor according to claim 1, characterized in that: The frame is composed of a baffle and a bottom plate, a mounting shaft is arranged in the middle of the baffle, the roller is sleeved on the mounting shaft, and there is a certain distance between the roller and the conveyor belt, and the distance is adjustable.

4. A co-extrusion device for foamed FEP and conductor according to claim 1 or 3, characterized in that: A central shaft passes through the middle of the drum, a straight groove is arranged on the baffle, the central shaft is clamped in the straight groove, and adjusting bolts are arranged at both ends of the central shaft. The adjusting bolts are inserted from above the baffle and pass through the straight groove.

5. The co-extrusion device of foamed FEP and conductor according to claim 1, characterized in that: The center of the gear is provided with a fixed shaft, a sleeve is sleeved on the fixed shaft, the sleeve is connected to the rotating wheel, a semicircular groove is provided on the rotating wheel, the rotating wheel is located in the wire through hole, the rack is located above the gear, and a convex tooth section and a straight bar section are provided on the rack.

6. The co-extrusion device of foamed FEP and conductor according to claim 1, characterized in that: A funnel-shaped feed hopper is arranged at one end of the barrel, a metering device and a drying device are installed on the feed hopper, a heating ring is arranged on the outer wall of the barrel, a screw is arranged inside the barrel, and a driving motor is connected to one end of the screw.

7. The co-extrusion device of foamed FEP and conductor according to claim 1, characterized in that: The cooling component comprises a water tank, a nozzle is arranged above the water tank, a pipeline is connected to the nozzle, and a valve is arranged in the middle of the pipeline.

8. A co-extrusion process of foamed FEP and conductor, characterized in that: The following steps are involved: S1: FEP raw material preparation: First, the FEP raw material is cleaned and dried to remove water, and the extrusion mechanism is preheated and debugged, the temperature is set, and the screw parameters are adjusted. Then, the FEP raw material, the weighed foaming agent and the FEP resin are evenly mixed and added to the extrusion mechanism; S2: Wire processing: The wire coil is placed on the wire pay-off mechanism, and the wire head is fixed on the traction device. The wire passes through the wire processing mechanism, and its surface is cleaned and straightened by the wire processing mechanism; S3: Co-extrusion molding: After the conductor passes through the conductor processing mechanism, it passes through the conductor through-hole of the co-extrusion die and is pulled out of the co-extrusion die at a uniform speed by the traction device. At the same time, the extrusion mechanism extrude the foamed FEP material, and it flows into the conductor through-hole through the manifold and evenly adheres to the conductor. During this process, the flow rate of the foamed FEP is controlled by the pressure regulating mechanism to ensure that the foamed FEP material is extruded evenly and the flow rate is stable, so as to achieve bonding with the conductor; S4: Cooling and winding: The co-extruded product of foamed FEP and conductor enters the cooling water tank after being output from the conductor through-hole. The heat of the product is quickly taken away by the cold water to solidify the product structure. The cooled product is pulled forward at a uniform speed by the traction device, and finally, it is neatly wound into a roll by the winding device.

9. A co-extrusion process of foamed FEP and conductor according to claim 8, characterized in that: In the step S1, the drying treatment of the FEP resin is carried out in a vacuum oven at a drying temperature of 120-150° C. and a drying time of 15 to 20 minutes.

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