A production method for a flexible communication power cable and an extrusion molding device

Abstract

The present invention discloses a production method and an extrusion molding device for a communication power soft cable, belonging to the technical field of cable production, including a connection seat and a cooling pool arranged along the advancing direction of the cable. A gathering groove is arranged inside the connection seat, and a contraction mechanism and a sealing plate mechanism are slidably connected inside the gathering groove. The gathering groove includes a conical part and a cylindrical part. The contraction mechanism slides inside the cylindrical part, while the sealing plate mechanism slides inside the conical part. By adopting a flame-retardant and fire-resistant protection system formed by a three-in-one synthetic mica fire-resistant layer + a ceramized silicone rubber tape fire-resistant protection layer + a high-flame-retardant and low-smoke halogen-free polyolefin outer sheath structure, the product meets the requirements of the bundled A-class combustion test and the fire-resistant test requirements for maintaining circuit integrity when the cable burns under flame conditions.

Description

Technical Field

[0001] The invention relates to the technical field of cable production, in particular to a production method and an extrusion molding device for a communication power supply soft cable. Background Art

[0002] As an important component of communication power equipment, communication power flexible cables are often used in the construction of large-scale information projects such as 5G communication networks, cloud data bases, and the Internet of Things. Traditional communication power flexible cables are generally composed of multiple twisted conductors, polyvinyl chloride insulation layers, PP filling ropes, OPP wrapping tapes, and polyvinyl chloride sheath layers. Since most of the actual use scenarios of this product are between devices or inside devices inside the computer room, dense bundled laying is often used, which puts higher requirements on product performance.

[0003] Cables in traditional technology have the following disadvantages:

[0004] 1. Conventional PVC insulation and sheath materials generally do not have flame retardant and fire resistant properties, and the material produces a large amount of smoke after burning, which is easy to cause secondary injuries to personnel when a fire occurs, and is not conducive to on-site search and rescue;

[0005] 2. Traditional communication power soft cables usually use polyvinyl chloride insulation and polyvinyl chloride sheath materials. The normal operating temperature of this material is generally below 45°C. The ambient temperature inside the equipment room is generally high. At the same time, the cable will also generate a certain amount of heat during operation. Especially when the cables are densely laid in bundles, the cable heat dissipation conditions are poor. In actual use, it is easy to reach the upper limit of normal operating temperature. The current carrying capacity of the cable running under high temperature conditions will drop significantly. At the same time, long-term high-temperature operation is very likely to accelerate cable aging, thereby causing line failures;

[0006] 3. The materials used in traditional communication power soft cables contain a lot of heavy metals and halogens, which cannot meet RoHS requirements and are not conducive to human health and environmental protection. Summary of the invention

[0007] The object of the present invention is to provide a method for producing a communication power supply flexible cable to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An extrusion molding device includes a connecting seat and a cooling pool arranged along the direction of cable advancement, a gathering groove is arranged inside the connecting seat, a contraction mechanism and a sealing mechanism are slidably connected inside the gathering groove, the gathering groove includes a conical part and a cylindrical part, the contraction mechanism slides inside the cylindrical part, and the sealing mechanism slides inside the conical part.

[0010] As a further solution of the present invention: Among them, an elastic component is provided between the contraction mechanism and the cylindrical part. The elastic component includes a guiding groove opened on the cylindrical part. The contraction mechanism includes a contraction cylinder. A guiding rod fixedly connected to the contraction cylinder is slidably connected inside the guiding groove, and a connecting spring is provided between the guiding rod and the guiding groove.

[0011] As a further solution of the present invention: Among them, the contraction cylinder has a hole structure with a stepped change in aperture size on the same axis.

[0012] As a further solution of the present invention: Among them, the sealing plate mechanism includes symmetrically distributed sliding grooves respectively opened on both sides of the inner wall of the conical part. A sliding block is slidably connected inside the sliding groove. A rubber outer ring is fixedly installed between the two sliding blocks. The center of the rubber outer ring is designed as a circular hole, and the circular hole can be sleeved on the cable. And a rubber inner ring is provided on the opposite surface of the circular hole close to the cable. The elasticity of the rubber outer ring is less than that of the rubber inner ring. That is, when the sealing plate mechanism is pulled, the rubber inner ring deforms first, and then the rubber outer ring deforms.

[0013] As a further solution of the present invention: Among them, a connecting rope is also provided between the contraction mechanism and the sealing plate mechanism. When the contraction mechanism moves along the direction of the cable, it will cooperate with the connecting rope to drive the sealing plate mechanism to move in the opposite direction.

[0014] As a further solution of the present invention: Among them, the cooling pool includes a pool body. A notch is provided on the end surface of the pool body close to the connecting seat, and the coolant can flow out from the notch.

[0015] As a further solution of the present invention: Among them, a support plate is fixedly installed on the notch. Uniformly distributed guide wheels are rotatably connected to the support plate. The guide wheels are in contact with the cable. During the forward movement of the cable, the guide wheels can be driven to rotate.

[0016] As a further solution of the present invention: Among them, driving gears synchronously rotating with the guide wheels are respectively fixedly installed at both ends of the guide wheels. A driven gear meshing with the driving gear is rotatably connected inside the support plate. An eccentric part of the driven gear is rotatably connected to a guiding connecting rod. A shaking plate is provided on the support plate. The guiding connecting rod is movably connected to the shaking plate. A plurality of uniformly distributed water filtering holes are opened at the middle position of the shaking plate.

[0017] The present invention also provides a production method for a communication power soft cable to solve the problems raised in the above-mentioned background technology.

[0018] To achieve the above object, the present invention provides the following technical solutions:

[0019] A method for producing a communication power supply flexible cable comprises the following steps:

[0020] Step S1: transporting a plurality of twisted soft copper conductor bundles to a gathering slot of a connection seat through a pulling device, and allowing the conductor bundles to pass through a shrinking tube and a sealing plate mechanism of a shrinking mechanism;

[0021] Step S2: injecting molten insulating material into the gathering groove through an extruder, and uniformly coating the surface of the conductor bundle under the guidance of the stepped hole structure of the shrink tube to form an insulating layer;

[0022] Step S3: When the raw material decreases, the shrinking mechanism and the sealing mechanism move closer to each other to reduce the effective space of the gathering tank, and the filling degree of a small amount of raw material in the effective space becomes higher, thereby ensuring uniform coating thickness;

[0023] Step S4: The coated cable enters a cooling pool for cooling and shaping to form a single cable, and then the single cable is wrapped with a fluoroplastic nylon filament braided hollow filling layer to form a composite, and the composite is wrapped with a polytetrafluoroethylene high-temperature insulation tape to form a primary composite cable, and then a ceramic silicone rubber tape is used for composite treatment, and finally the outer sheath material is extruded and coated by a single screw extruder to form the final composite cable.

[0024] As a further solution of the present invention: wherein, the step S1 specifically includes:

[0025] Step S1.1: guiding the conductor bundle through the rubber outer ring of the sealing plate mechanism through the conical part of the gathering groove, and the rubber inner ring is squeezed and deformed by the conductor to form a covering channel;

[0026] Step S1.2: Under the action of the extrusion pressure, the shrinking tube of the shrinking mechanism moves forward along the guide groove, compressing the connecting spring to increase the effective volume of the gathering groove;

[0027] The step S3 specifically includes:

[0028] Step S3.1: When the extrusion pressure drops, the connecting spring pushes the shrinking tube to reset, and the sliding block of the sealing plate mechanism is pulled to slide toward the front end of the cone through the connecting rope;

[0029] Step S3.2: The rubber outer ring is squeezed by the sliding block, and the gap between its inner ring and the conductor bundle is reduced to 0.1-0.3mm, forcing the residual molten material to completely cover the cable surface;

[0030] The step S4 specifically includes:

[0031] Step S4.1: When the cable passes through the support plate, the guide wheel rotates along with the movement of the cable, driving the driving gear to mesh with the driven gear;

[0032] Step S4.2: The eccentric motion of the driven gear is transmitted to the shaking plate through the guiding connecting rod, causing the shaking plate to swing reciprocally at an inclined angle, guiding the coolant to flow towards the notch through the water filtering holes, and forming a low-temperature cooling zone.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. In the production method of this embodiment, by adopting the structure of a three-in-one synthetic mica refractory layer + a ceramicized silicone rubber tape refractory protection layer + a high-flame-retardant low-smoke halogen-free polyolefin outer protection layer to form a flame-retardant and refractory protection system, the product meets the requirements of the bundled A-class combustion test and the refractory test requirements for maintaining circuit integrity when the cable burns under flame conditions; the product adopts the structure of a 105°C cross-linked polyolefin insulation layer + a fluoroplastic nylon wire braided hollow filling + a polytetrafluoroethylene high-temperature heat-insulating tape protection layer to form a high-temperature protection system, so that the product meets the requirements of the insulation resistance test at high temperatures; the materials used in the products do not contain heavy metals, organic bromides, and phthalates, meeting the RoHS environmental protection requirements.

[0035] 2. In the extrusion molding device of this embodiment, when the raw material is reduced, the contraction mechanism moves backward at this time. Under the elastic force of the rubber outer ring and the rubber inner ring, the sealing plate mechanism will move in the opposite direction (forward). At this time, the rubber inner ring gradually approaches the cable, and cooperates with the contraction mechanism to reduce the effective space of the aggregation groove, so that the cable can be better and uniformly coated in the final stage of extrusion molding.

[0036] 3. In the extrusion molding device of this embodiment, the shaking plate is immersed in the coolant in the pool body. Therefore, during the shaking process, the flow direction of the coolant can be changed. Furthermore, when the cable just enters the pool body, it will be quickly cooled. Moreover, the shaking plate is in an inclined shape, so that the water flow in the pool body can move from the far end to the end face close to the notch. Thus, when the cable just enters the pool body, it can contact the cooling water with a lower temperature, improving the cooling effect. Description of the Drawings

[0037] Figure 1 is the overall schematic diagram of the extrusion molding device in the present invention;

[0038] Figure 2 is the schematic diagram of the connection seat and the cooling pool structure in the present invention;

[0039] Figure 3 is the present invention Figure 2 the enlarged schematic diagram at A in;

[0040] Figure 4 is the connection schematic diagram of the contraction mechanism and the sealing plate mechanism in the present invention;

[0041] Figure 5 is the sectional view schematic diagram of the contraction mechanism and the sealing plate mechanism in the present invention;

[0042] Figure 6 For the present invention Figure 5 Schematic enlarged view at B in the present invention;

[0043] Figure 7 Schematic structural view of the cooling pool in the present invention;

[0044] Figure 8 Schematic view of the water flow direction in the cooling pool in the present invention;

[0045] Figure 9 Schematic structural view of the support plate at the notch in the present invention;

[0046] Figure 10 Schematic structural view of the guide wheel and the driving gear in the present invention;

[0047] Figure 11 Schematic structural view of the cable in the present invention.

[0048] The corresponding relationship between the labels of each attached figure in the figure and the component names is as follows:

[0049] 10. Connecting seat; 11. Aggregation groove; 111. Conical part; 1111. Sliding groove; 1112. Sliding block; 1113. Rubber outer ring; 112. Cylindrical part; 1121. Guide groove; 12. Shrinking mechanism; 121. Shrinking cylinder; 122. Guide rod; 123. Connecting spring; 13. Sealing plate mechanism; 20. Cooling pool; 21. Pool body; 22. Notch; 23. Support plate; 24. Guide wheel; 25. Driving gear; 26. Driven gear; 27. Guide connecting rod; 28. Oscillating plate; 29. Water filtering hole; 30. Connecting rope; 41. Copper conductor; 42. Three-in-one synthetic mica fire-resistant layer; 43. Insulating layer; 44. Fluoroplastic nylon wire braided hollow filling layer; 45. Polytetrafluoroethylene high-temperature resistant and heat-insulating tape; 46. Ceramicized silicone rubber tape; 47. Outer protective layer material. Detailed implementation manners

[0050] As Figure 11 shown, the present invention provides a production method for a communication power soft cable, and the specific method includes the following steps:

[0051] S100. Conductor pretreatment: Select oxygen-free copper rods with a purity ≥ 99.99%, and perform multiple cold drawing processes through a wire drawing machine to process them into copper wires with the required specifications, with a diameter error of ±0.01 mm; then twist multiple copper wires according to the right-hand rule, and the twisting pitch is 8 - 12 times the outer diameter of the conductor, forming a bundle of flexible copper conductors 41. During the twisting process, apply a tension of 0.05 - 0.1 N / N / mm² to ensure a tight conductor structure.

[0052] S101. Preparation and coating of the fire-resistant layer: Through the treatment and preparation of materials, and through the wrapping process to achieve the purpose of fire resistance.

[0053] In this step, first, it is necessary to process the three-in-one synthetic mica refractory layer 42, which specifically includes the following steps: Material preparation: Using synthetic mica paper (with a thickness of 50 - 80 μm) as the base material, double-sidedly compounded with fiberglass cloth (grammage 80 - 100 g / m²), and using silicone resin (solid content 60% - 70%) as the adhesive, the adhesive is evenly coated on the surface of the mica paper through a coater (coating amount 20 - 30 g / m²), and dried at 80 - 100 °C for 10 - 15 minutes to form a three-in-one synthetic mica tape.

[0054] Wrapping process: The synthetic mica tape is spirally wrapped around the copper conductor with a lapping rate ≥ 30% (wrapping speed 50 - 80 r / min), and after wrapping, it is preliminarily compacted (pressure 10 - 15 N / cm²) to ensure that the refractory layer is closely attached to the conductor.

[0055] S102. Preparation and assembly of the high-temperature resistant layer: Mixing formula: Weigh 80 - 90 parts of polyolefin resin (base material), 10 - 15 parts of special halogen-free flame retardant, 5 - 8 parts of smoke suppressant, 2 - 3 parts of antioxidant, 1 - 2 parts of cross-linking agent, and 1 - 1.5 parts of high-efficiency lubricant by mass ratio, and put them into a twin-screw extruder (temperature 160 - 180 °C, screw speed 150 - 200 r / min) for compounding and pelletizing to obtain insulating material.

[0056] Extrusion molding: Put the insulating material into the extruder and extrude it outside the conductor (extrusion temperature 170 - 190 °C, traction speed 20 - 30 m / min), and after cooling, form an insulating layer 43 with a uniform thickness (thickness tolerance ±5%). Subsequently, warm water cross-linking is carried out (water temperature 70 - 80 °C, time 4 - 6 hours) to raise the temperature resistance level to 105 °C.

[0057] In this step, it is also necessary to process a fluoroplastic nylon wire braided hollow filling layer 44 for it, and the specific method is as follows:

[0058] Preparation of the hollow filling body: Using fluoroplastic (polytetrafluoroethylene or FEP) as the raw material, it is formed into a tube by extrusion through an extruder (extrusion temperature 250 - 280 °C) to obtain a fluoroplastic tube with an inner diameter of 2 - 5 mm and a wall thickness of 0.3 - 0.5 mm; simultaneously, the nylon wire (diameter 0.2 - 0.3 mm) braiding process is carried out, and it is spirally wound and braided outside the fluoroplastic tube at a density of 10 - 15 meshes per inch to form a hollow filling body with a support structure.

[0059] Filling process: The hollow filling body is evenly filled between multiple insulated wire cores according to the proportion of the cable cross-section void ratio of 30% - 40%, and compacted through a filling die (temperature 40 - 60 °C) to ensure that the wire cores are arranged neatly and there is an air circulation channel reserved inside.

[0060] Next, the polytetrafluoroethylene high-temperature resistant and heat-insulating tape 45 is carried out, and the specific method is as follows:

[0061] Tape preparation: The pure polytetrafluoroethylene dispersion resin is pressed into a blank strip by a strip press (pressure 5 - 8 MPa), and then made into a tape with a thickness of 0.1 - 0.2 mm by a high-temperature stretching machine (temperature 300 - 320 °C, stretching multiple 3 - 5 times) (stretching speed 5 - 10 m / min).

[0062] Wrapping operation: The tape is wrapped around the outside of the insulated wire core and the filler with an overlap rate of 20% - 25% (wrapping speed 70 - 100 r / min) to form a high-temperature resistant and heat-insulating layer, and the surface is leveled after wrapping (pressure 5 - 8 N / cm²).

[0063] Then, the preparation of the fire-resistant protective layer of the ceramized silicone rubber tape is carried out, and the specific steps are as follows:

[0064] Composite treatment: The ceramized silicone rubber sheet (thickness 0.3 - 0.5 mm) and the single-sided fiberglass cloth (gram weight 60 - 80 g / m²) are compounded into the ceramized silicone rubber tape 46 by a hot pressing composite machine (temperature 120 - 150 °C, pressure 0.5 - 1 MPa, time 3 - 5 minutes).

[0065] Wrapping process: In the subsequent process, the ceramized silicone rubber tape is wrapped around the outside of the high-temperature resistant protection system with a coverage rate of 25% - 30% (wrapping speed 60 - 90 r / min) to form the second fire-resistant barrier.

[0066] S103. Outer sheath preparation and forming: Weigh 70 - 80 parts of polyolefin resin, 20 - 30 parts of inorganic flame retardant (aluminum hydroxide / magnesium hydroxide compound, ratio 3:2), 3 - 5 parts of flame retardant synergist (antimony trioxide), 1 - 2 parts of antioxidant, and 1 - 1.5 parts of processing aid according to the mass ratio, and put them into a high-speed mixer (rotation speed 800 - 1000 r / min, time 10 - 15 minutes) to mix evenly to obtain the outer sheath material 47. The outer sheath material is put into a single-screw extruder (temperature 160 - 180 °C, screw rotation speed 120 - 150 r / min), and extruded and formed outside the fire-resistant protection system (extrusion temperature 170 - 190 °C, traction speed 15 - 25 m / min), and after cooling, an outer sheath with a uniform thickness (thickness tolerance ±5%) is formed, and the surface is smooth and defect-free.

[0067] In order to meet the production requirements of the above communication power soft cable, the present invention also proposes a communication power soft cable production extrusion molding device to improve the performance of the cable made of the above materials.

[0068] Please refer to Figure 1, which is the overall structural schematic diagram in this embodiment. The extrusion molding device includes an extruder, and a connecting seat 10 and a cooling pool 20 are respectively arranged along the advancing direction of the cable. The connecting seat 10 is fixedly connected to the output end of the extruder.

[0069] During the use of this device, the extruder extrudes the broken raw materials into the connecting seat 10, and then into the gathering groove 11. When the cable passes through the gathering groove 11, the molten raw materials can be coated on the surface of the cable to form a protective layer. If when the cable coating is about to be completed finally, at this time the raw materials will gradually decrease. If it decreases to a certain extent and cannot reach the amount that the extruder extrudes forward, the raw materials will remain in the gathering groove 11. If there is too little raw material, the phenomenon of uneven coating will occur. Therefore, to solve this problem, the present invention makes the following improvements.

[0070] As Figure 2 and Figure 3 shown, a gathering groove 11 is opened inside the connecting seat 10. A contraction mechanism 12 and a sealing plate mechanism 13 are slidably connected inside the gathering groove 11. The gathering groove 11 includes a conical part 111 and a cylindrical part 112. The contraction mechanism 12 slides inside the cylindrical part 112, while the sealing plate mechanism 13 slides inside the conical part 111. In this embodiment, when the raw materials are sufficient, due to the power of the extruder, raw materials will be continuously extruded forward into the gathering groove 11, and under the action of the transmission of the raw material power, it will push the contraction mechanism 12 to move towards the direction of the cable, that is, the contraction mechanism 12 enters into the cylindrical part 112; when the raw materials decrease, due to the decrease or disappearance of the thrust of the extruder, at this time the contraction mechanism 12 retracts, and the end of the contraction mechanism 12 coincides with the initial end of the cylindrical part 112. As Figure 4 shown, at this time the effective space of the gathering groove 11 gradually decreases, and the filling degree of the small amount of raw materials in the gathering groove 11 will become higher, so that the raw materials remaining inside will be further filled; when the cable passes through this space, it will be evenly coated.

[0071] Furthermore, as Figure 4 、 Figure 5 and Figure 6 shown, an elastic component is arranged between the contraction mechanism 12 and the cylindrical part 112. The elastic component includes a guiding groove 1121 opened in the cylindrical part 112. The contraction mechanism 12 includes a contraction cylinder 121. A guiding rod 122 fixedly connected to the contraction cylinder 121 is slidably connected inside the guiding groove 1121. A connecting spring 123 is arranged between the guiding rod 122 and the guiding groove 1121. When the contraction mechanism 12 needs to retract, the connecting spring 123 plays a role in providing a resilience force.

[0072] Further, the shrinkage cylinder 121 has a hole structure with a stepped change in aperture size on the same axis, and the hole structure with the smallest aperture can match the radius of the cable, so that the raw material of the shrinkage cylinder 121 can be better coated on the cable.

[0073] In order to better reduce the raw material inside the aggregation tank 11 and avoid the phenomenon of uneven coating, the present invention also makes the following improvements. The sealing plate mechanism 13 includes symmetrically distributed sliding grooves 1111 respectively opened on both sides of the inner wall of the conical part 111. A sliding block 1112 is slidably connected inside the sliding groove 1111. A rubber outer ring 1113 is fixedly installed between the two sliding blocks 1112. The center of the rubber outer ring 1113 is designed as a round hole, and the round hole can be sleeved on the cable. And a rubber inner ring (not shown in the figure) is provided on the opposite surface of the round hole close to the cable. The elasticity of the rubber outer ring 1113 is less than that of the rubber inner ring, that is, when the sealing plate mechanism 13 is pulled, the rubber inner ring deforms first, and then the rubber outer ring 1113 deforms. And a connecting rope 30 is also provided between the shrinking mechanism 12 and the sealing plate mechanism 13. When the shrinking mechanism 12 moves along the direction of the cable, it will cooperate with the connecting rope 30 to drive the sealing plate mechanism 13 to move in the opposite direction. Specifically, initially, the rubber inner ring will fit on the cable. Under the driving force of the forward extrusion of the extruder, due to the extrusion force being greater than the deformation force of the rubber inner ring, the rubber inner ring will generate deformation. After the deformation, the rubber inner ring will separate from the cable to form a through groove for the raw material to pass through. And when the shrinking mechanism 12 moves forward, it will drive the sealing plate mechanism 13 to move backward through the connecting rope 30. After the movement, the sealing plate mechanism 13 moves backward under the action of the guiding groove 1121. At this time, the rubber inner ring is pulled and the through groove becomes larger again. The enlarged through groove can allow the raw material to quickly enter the aggregation tank 11 from the extruder. And when the raw material decreases, at this time the shrinking mechanism 12 moves backward. Under the elastic force of the rubber outer ring 1113 and the rubber inner ring, the sealing plate mechanism 13 will move in the opposite direction (forward). At this time, the rubber inner ring gradually approaches the cable, and cooperates with the shrinking mechanism 12 to reduce the effective space of the aggregation tank 11, so that the cable can be better and evenly coated in the final stage of extrusion molding.

[0074] After the cable is coated, it needs to be cooled and shaped in the cooling pool 20, as Figure 7 and Figure 8 shown. The cooling pool 20 includes a pool body 21. The pool body 21 is provided with a notch 22 on the end face close to the connecting seat 10. In the traditional technology, the cooling water in the pool body 21 continuously flows away through the notch 22 to form flowing cooling water, and the cable enters the coolant through the notch 22. The cooling effect of this cooling method is not obvious because the cooled coolant that has flowed away continues to act on the cable that has just entered the pool body 21. Therefore, the following improvements are made.

[0075] As Figure 9 and Figure 10 shown, a support plate 23 is fixedly installed on the notch 22. Uniformly distributed guide wheels 24 are rotatably connected to the support plate 23. The guide wheels 24 are in contact with the cable. During the forward movement of the cable, the guide wheels 24 can be driven to rotate, thereby changing the original sliding friction into rolling friction and reducing the frictional force. At the same time, driving gears 25 that rotate synchronously with the guide wheels 24 are fixedly installed at both ends of the guide wheels 24 respectively. A driven gear 26 that meshes with the driving gear 25 is rotatably connected inside the support plate 23. A guide link 27 is rotatably connected to the eccentric position of the driven gear 26. A shaking plate 28 is arranged on the support plate 23. The guide link 27 is movably connected to the shaking plate 28. In this embodiment, when the cable contacts the guide wheel 24, the guide wheel 24 will be driven to rotate inside the support plate 23. As the guide wheel 24 rotates, the driving gear 25 will be driven to rotate. The driving gear 25 meshes and drives the driven gear 26 to rotate. Furthermore, with the action of the guide link 27, the shaking plate 28 at the bottom of the support plate 23 can be driven to move. Because the lengths of the guide links 27 are different and the length of the guide link 27 gradually becomes shorter along the advancing direction of the cable, the shaking plate 28 will move in an inclined direction inside the pool body 21. And because the shaking plate 28 is immersed in the coolant of the pool body 21, the flow direction of the coolant can be changed during the shaking process. Therefore, when the cable just enters the pool body 21, it will be quickly cooled. Moreover, the inclined shape of the shaking plate 28 enables the water flow in the pool body 21 to move from the far end to the end face close to the notch 22. Thus, when the cable just enters the pool body 21, it can contact the relatively cold cooling water, improving the cooling effect. The water flow direction is as Figure 8 shown.

[0076] A number of uniformly distributed water filtering holes 29 are opened at the middle position of the shaking plate 28. The water filtering holes 29 can reduce the resistance of the shaking plate 28 in the pool body 21. And the influence of the water filtering holes 29 arranged in the middle on changing the water flow direction is also relatively small.

[0077] The specific production method steps are as follows:

[0078] Step S1: A plurality of stranded soft copper conductor bundles 41 are conveyed into the gathering groove 11 of the connecting seat 10 through a traction device, and the conductor bundles pass through the contraction cylinder 121 of the contraction mechanism 12 and the sealing plate mechanism 13;

[0079] Step S2: Molten insulating material is injected into the gathering groove 11 through an extruder and uniformly coated on the surface of the conductor bundles under the guidance of the stepped hole structure of the contraction cylinder 121 to form an insulating layer 43;

[0080] Step S3: When the raw material decreases, the shrinking mechanism 12 and the sealing plate mechanism 13 approach each other to reduce the effective space of the aggregation tank 11. The filling degree of a small amount of raw material in the effective space will increase, thus ensuring uniform coating thickness.

[0081] Step S4: The coated cable enters the cooling pool 20 for cooling and shaping to form a single cable. Then, the single cable is wound with a fluoroplastic nylon filament braided hollow filling layer to form a composite. The composite is wound with a polytetrafluoroethylene high-temperature heat-insulating tape to form a primary composite cable. Then, it is further processed with a ceramicized silicone rubber tape 46. Finally, an outer protective layer material 47 is extruded and coated through a single-screw extruder to form the final composite cable.

[0082] The specific steps of step S1 include:

[0083] Step S1.1: The conductor bundle is guided through the rubber outer ring 1113 of the sealing plate mechanism 13 by the conical part 111 of the aggregation tank 11. The rubber inner ring deforms under the extrusion of the conductor to form a coating channel.

[0084] Step S1.2: Under the action of the extrusion pressure, the contraction cylinder 121 of the shrinking mechanism 12 moves forward along the guiding groove 1121, compressing the connecting spring 123, and increasing the effective volume of the aggregation tank 11.

[0085] The specific steps of step S3 include:

[0086] Step S3.1: When the extrusion pressure drops, the connecting spring 123 pushes the contraction cylinder 121 to reset, and the sliding block 1112 of the sealing plate mechanism 13 is pulled by the connecting rope 30 to slide towards the front end of the conical part 111.

[0087] Step S3.2: The rubber outer ring 1113 is squeezed by the sliding block 1112, and the gap between its inner ring and the conductor bundle is reduced to 0.1 - 0.3 mm, forcing the remaining molten material to completely coat the surface of the cable.

[0088] The specific steps of step S4 include:

[0089] Step S4.1: When the cable passes through the support plate 23, the guide wheel 24 rotates with the movement of the cable, driving the driving gear 25 to mesh with the driven gear 26.

[0090] Step S4.2: The eccentric movement of the driven gear 26 is transmitted to the shaking plate 28 through the guiding connecting rod 27, causing the shaking plate 28 to swing reciprocally at an inclined angle, guiding the coolant to flow towards the notch 22 through the water filtering holes 29, forming a low-temperature cooling zone.

[0091] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. An extrusion molding device, characterized in that, It includes a connecting seat (10) and a cooling pool (20) arranged along the advancing direction of the cable. Inside the connecting seat (10), there is an aggregation groove (11). Inside the aggregation groove (11), a contraction mechanism (12) and a sealing plate mechanism (13) are slidably connected. The aggregation groove (11) includes a conical part (111) and a cylindrical part (112). The contraction mechanism (12) slides inside the cylindrical part (112), while the sealing plate mechanism (13) slides inside the conical part (111). An elastic component is arranged between the contraction mechanism (12) and the cylindrical part (112). The elastic component includes a guiding groove (1121) opened on the cylindrical part (112). The contraction mechanism (12) includes a contraction cylinder (121). A guiding rod (122) fixedly connected to the contraction cylinder (121) is slidably connected inside the guiding groove (1121). A connecting spring (123) is arranged between the guiding rod (122) and the guiding groove (1121). The contraction cylinders (121) are in a hole structure with a stepped change in aperture size on the same axis. The sealing plate mechanism (13) includes sliding grooves (1111) symmetrically distributed and opened on both sides of the inner wall of the conical part (111). Inside the sliding grooves (1111), sliding blocks (1112) are slidably connected. A rubber outer ring (1113) is fixedly installed between the two sliding blocks (1112). The center of the rubber outer ring (1113) is designed as a round hole, and the round hole can be sleeved on the cable. And on the opposite surfaces of the round hole close to the cable, there is a rubber inner ring. The elasticity of the rubber outer ring (1113) is less than that of the rubber inner ring. That is, when the sealing plate mechanism (13) is pulled, the rubber inner ring deforms first, and then the rubber outer ring (1113) deforms. A connecting rope (30) is also arranged between the contraction mechanism (12) and the sealing plate mechanism (13). When the contraction mechanism (12) moves along the direction of the cable, it will cooperate with the connecting rope (30) to drive the sealing plate mechanism (13) to move in the opposite direction.

2. The extrusion molding device according to claim 1, characterized in that, The cooling pool (20) includes a pool body (21). On the end face of the pool body (21) close to the connecting seat (10), there is a notch (22), and coolant can flow out from the notch (22).

3. The extrusion molding device according to claim 2, characterized in that, A support plate (23) is fixedly installed on the notch (22). Uniformly distributed guide wheels (24) are rotatably connected to the support plate (23). The guide wheels (24) are in contact with the cable. During the forward movement of the cable, the guide wheels (24) can be driven to rotate.

4. The extrusion molding device according to claim 3, characterized in that, Active gears (25) synchronously rotating with the guide wheels (24) are fixedly installed at both ends of the guide wheels (24). Inside the support plate (23), a driven gear (26) meshing with the active gears (25) is rotatably connected. At the eccentric position of the driven gear (26), a guide link (27) is rotatably connected. The support plate (23) is provided with a shaking plate (28). The guide link (27) is movably connected to the shaking plate (28). A number of uniformly distributed water filtering holes (29) are opened at the middle position of the shaking plate (28).

5. A production method for a flexible communication power cable, wherein the extrusion molding device described in any one of claims 1-4 is used during the production process, characterized in that, It includes the following steps: Step S1: Bundle multiple stranded copper conductors (41) and transport them through a traction device into the gathering groove (11) of the connection seat (10), so that the conductor bundle passes through the contraction cylinder (121) of the contraction mechanism (12) and the sealing plate mechanism (13); Step S2: Inject molten insulating material into the gathering groove (11) through an extruder, and under the guidance of the stepped hole structure of the contraction cylinder (121), evenly coat the surface of the conductor bundle to form an insulating layer (43); Step S3: When the raw material decreases, the contraction mechanism (12) and the sealing plate mechanism (13) approach each other to reduce the effective space of the gathering groove (11), and the filling degree of a small amount of raw material in the effective space will become higher, thereby ensuring uniform coating thickness; Step S4: The coated cable enters the cooling pool (20) for cooling and shaping to form a single cable. Then, the single cable is wound with a fluoroplastic nylon wire braided hollow filling layer to form a composite. The composite is wound with a polytetrafluoroethylene high-temperature heat-insulating tape to form a primary composite cable. Then, it is further processed with a ceramicized silicone rubber tape (46). Finally, an outer sheath material (47) is extruded and coated through a single-screw extruder to form the final composite cable product.

6. The production method of the communication power soft cable according to claim 5, characterized in that, Step S1 specifically includes: Step S1.1: Guide the conductor bundle through the rubber outer ring (1113) of the sealing plate mechanism (13) through the conical part (111) of the gathering groove (11). The rubber inner ring deforms under the extrusion of the conductor to form a coating channel; Step S1.2: Under the action of the extrusion pressure, the contraction cylinder (121) of the contraction mechanism (12) moves forward along the guide groove (1121), compressing the connecting spring (123) to increase the effective volume of the gathering groove (11); Step S3 specifically includes: Step S3.1: When the extrusion pressure drops, the connecting spring (123) pushes the contraction cylinder (121) to reset, and through the connecting rope (30), the sliding block (1112) of the sealing plate mechanism (13) is pulled to slide forward to the front end of the conical part (111); Step S3.2: The rubber outer ring (1113) is squeezed by the sliding block (1112), and the gap between its inner ring and the conductor bundle is reduced to 0.1 - 0.3 mm, forcing the remaining molten material to be completely coated on the surface of the cable; Step S4 specifically includes: Step S4.1: When the cable passes through the support plate (23), the guide wheel (24) rotates as the cable moves, driving the driving gear (25) to mesh with the driven gear (26); Step S4.2: The eccentric movement of the driven gear (26) is transmitted to the shaking plate (28) through the guide link (27), causing the shaking plate (28) to swing reciprocally at an inclined angle, guiding the coolant to flow through the water filtering holes (29) towards the notch (22) to form a low-temperature cooling zone.

Images