High-temperature flat small die body machine head

Abstract

The invention relates to the technical field of cable injection mold body machine heads, in particular to a high-temperature flat small mold body machine head which comprises a mold core and a machine core, the mold core is sleeved with a mold sleeve, the machine core is sleeved with a main body, the mold core and the mold sleeve are both sleeved with the machine core, and a threading hole and a discharging hole used for conveying metal core wires are formed in the center position of the mold core and the center position of the mold sleeve respectively. A wire stabilizing part comprising a bearing end seat and a magnetic suspension end is arranged in the mold core, and the binding part sprays a molding agent to melt wrapping the metal core wire through the high-pressure cavity so as to flatten the surface. The buffer space is arranged, the problem that a machine head needs to be lengthened due to uneven dispersion caused by a taper angle can be solved, high temperature conducted by the machine head can be resisted, abrasion particles do not exist, and pollutants can be purged in the nitrogen environment; therefore, the deionized water or the thin silicone oil emulsion or the UV curing agent in the high-pressure cavity is driven to spray the metal core wire wrapping the melt, and the effects of accelerating curing, flattening the surface and stabilizing the structure are achieved.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine head technology for cables, and more particularly to high-temperature flat small mold head. Background Technology

[0002] With the rapid growth in market demand for fluoroplastic cables, the demand for extrusion heads and dies used for fluoroplastics such as silicone rubber, polytetrafluoroethylene, FEP, and PFA, as well as high-temperature resistant insulating materials such as polyetheretherketone, has surged. Under current conditions, in order to comply with environmentally friendly production, many plastic wastes are recycled and reused, specifically by using injection molding machines to inject molten plastic waste onto cables to form a coating layer.

[0003] The cable injection molding die head produces a cable by injection molding a metal core wire coated with a plastic sheath, as shown in the instruction manual. Figure 15 With appendix Figure 16 As shown, the device includes a mold core 100 and a mold sleeve 200. The mold sleeve 200 is fitted onto the mold core 100, with an injection gap 300 between them. A metal core wire passes through the mold core 100, and the injection gap 300 is formed by coating the metal core wire with a plastic outer sheath. Then, a main body 400 and a core 500 are used to encapsulate the mold core 100 and the mold sleeve 200, forming a precision injection molding die head. Existing die heads mainly adopt a relatively long conical inlet structure, which can increase the residence time of the rubber material in the die head, allowing the rubber material more time to disperse, mix, and plasticize, thereby improving the uniformity and density of the rubber material. During the extrusion molding process, when the rubber material is forced from the large-diameter barrel into the small-diameter nozzle, it will be subjected to strong compression and shearing forces. The long conical structure allows the rubber material to better adapt to this change, achieving more thorough shearing and mixing. The cone angle affects the extrusion pressure and speed. A larger cone angle results in higher extrusion pressure and speed, producing a smoother and denser semi-finished product, but also a greater shrinkage rate. To compensate for the uneven dispersion caused by the cone angle, the die head is usually intentionally lengthened to allow sufficient time for the rubber compound to disperse within the die head, thereby improving product quality. This leads to a generally longer die head structure and a large amount of plastic waste, resulting in significant waste of plastic materials during cable injection molding.

[0004] Existing high-temperature and corrosion-resistant injection heads include a novel injection molding machine with a self-cooling injection mold head proposed in application number CN202221446446.3. The self-cooling injection mold head includes an internal threaded connector, an end support plate, a hollow extrusion head, a connecting threaded hole, a quick-release cooling rack structure, and inlet and outlet water pipes. To extend the melt cooling time, a room-temperature conical injection structure is generally adopted. The overall dimensions of the injection head are relatively long, and the consumable molds used are also relatively long. Due to the high price of the alloy materials used in this type of injection head and mold, the production costs of cable manufacturers remain high. Meanwhile, traditional injection molding machine heads often use a single traction action to transport metal core wires, relying solely on a threading hole with a diameter slightly larger than the metal core wire for guidance and limiting. However, during the injection molding process, the metal core wire is affected by the impact of the melt and other forces, causing it to vibrate. Furthermore, it may undergo thermal expansion and contraction when in contact with the high-temperature melt. Without stable protection, the metal core wire cannot make effective contact with the melt, preventing the melt from forming a complete coating effect on the metal core wire. After exiting the injection molding machine head, the melt may also have burrs and unevenness on the surface due to vibration, which cannot guarantee the quality of the metal core wire injection molded product. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of excessive melt consumption and lack of stability affecting the quality of cable injection molding caused by the existing injection molding die head structure process, and to propose a high-temperature flat small die head.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The high-temperature flat small mold head includes a mold core and a machine core. A mold sleeve is fitted on the mold core, and a main body is fitted on the machine core. Both the mold core and the mold sleeve are fitted inside the machine core. The mold core and the mold sleeve are respectively provided with a threading hole and a discharge hole for conveying the metal core wire. The mold core is provided with a wire stabilizing part including a load-bearing end seat and a magnetic suspension end. The wire stabilizing part drives the metal core wire to rotate through the threading hole located in the magnetic suspension end to improve concentricity. An injection gap is provided between the mold core and the mold sleeve. A positioning head and a limiting head are respectively provided at the head of the mold core and the mold sleeve. A buffer space is provided between the positioning head and the limiting head. The melt formed by melting plastic waste flows to the metal core wire through the injection gap and the buffer space. The movement has an injection groove that connects to the buffer space, and the main body has a connecting hole that connects to the injection groove. A pressure cap is installed on the mold sleeve, and a tightening part that matches the wire stabilizing part is provided in the pressure cap. The tightening part includes a synchronization end and a high-pressure chamber, and the tightening part sprays a plasticizer onto the melt covering the metal core wire through the high-pressure chamber to smooth the surface.

[0007] Preferably, the mold core has a conical structure.

[0008] Preferably, the positioning head is provided with a mold core positioning pin for fixing and connecting the limiting head.

[0009] Preferably, a mold flow channel partition ring is provided between the positioning head and the limiting head to support the buffer space, and the mold core positioning pin passes through the mold flow channel partition ring.

[0010] Preferably, the movement is provided with a directional positioning pin for connecting the positioning head, and the movement is provided with a movement positioning screw and a movement positioning pin for connecting the main body.

[0011] Preferably, the load-bearing end seat and the magnetic suspension end head are rotatably connected, and a sealing cover that is rotatably fitted onto the magnetic suspension end head is fixedly installed on the load-bearing end seat; the stabilizing part also includes; A hollow annular cavity, wherein the hollow annular cavity is formed in the load-bearing end seat; A nitrogen gas tube, wherein the nitrogen gas tube is fixedly installed in a hollow annular cavity; A samarium cobalt rotor permanent magnet ring is rotatably mounted in a nitrogen air pipe, and the samarium cobalt rotor permanent magnet ring rotates in contact with the magnetic suspension end.

[0012] Preferably, wear-resistant rubber rings are provided on both the permanent magnet ring and the magnetic suspension end of the samarium cobalt rotor.

[0013] Preferably, the number of high-pressure cavities is 2-6, and the 2-6 high-pressure cavities are equidistantly arranged around the synchronizing end on the hollow end seat.

[0014] Preferably, the high-pressure chamber has a three-way structure, and a one-way valve is provided in the outer port of the high-pressure chamber away from the guide groove.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention sets up a buffer space, which helps to solve the problem of needing to lengthen the die head due to uneven dispersion caused by the cone angle, thereby reducing the size of the die head, reducing the use of melt, and thus controlling the cost of consumables; a mold flow channel partition ring is set up for support and fixed by the mold core positioning pin, thereby limiting the size of the buffer space. The buffer space can meet the requirement that the melt has enough time to disperse inside the die head.

[0016] 2. This invention features a wire stabilizing section within the mold core. A sealing cover divides the conical mold core into a load-bearing end and a magnetic suspension end. A hollow annular cavity is formed within the load-bearing end, housing a samarium cobalt axial stator magnetic ring that is dynamically supported by a nitrogen gas pipe and movably contacts the magnetic suspension end. Simultaneously, through the electromagnetic stator and the samarium cobalt axial stator magnetic ring acting on it, any directional non-uniformity of the samarium cobalt axial stator magnetic ring is averaged out. The combination of air levitation and magnetic levitation provides vibration suppression capability. Key magnetic components utilize samarium cobalt magnets, which can withstand the high temperatures transmitted by the machine head, are free of abrasive particles, and the nitrogen environment can purge contaminants, thereby driving the magnetic suspension end to smoothly propel and transport the metal core wire.

[0017] 3. The present invention provides a tightening part in the pressure cap that rotates in conjunction with the stabilizing part, and uses a crescent-shaped abutment to intermittently drive the elastic trigger, thereby driving the deionized water or dilute silicone oil emulsion or UV curing agent in the high-voltage chamber to spray the metal core wire covering the melt, thereby accelerating curing, smoothing the surface and stabilizing the structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the high-temperature flat small mold head proposed in this invention; Figure 2 This is a bottom view of the high-temperature flat small mold head proposed in this invention; Figure 3 This is an exploded structural diagram of the high-temperature flat small mold head proposed in this invention; Figure 4 This is a schematic diagram of the buffer space structure of the high-temperature flat small mold head proposed in this invention; Figure 5 This is a schematic diagram of the mold core, mold sleeve, and pressure cap structure of the high-temperature flat small mold head proposed in this invention; Figure 6 This is a cross-sectional view of the high-temperature flat small mold head proposed in this invention; Figure 7 This is a schematic diagram of the injection groove structure of the high-temperature flat small mold head proposed in this invention; Figure 8 This is a schematic diagram of the mold core structure of the high-temperature flat small mold head proposed in this invention; Figure 9 This is a cross-sectional view of the core structure of the high-temperature flat small mold head proposed in this invention; Figure 10 This is an enlarged schematic diagram of part A of the high-temperature flat small mold head proposed in this invention; Figure 11 This is a schematic diagram of the pressure cap and tightening part structure of the high-temperature flat small mold head proposed in this invention; Figure 12This is a cross-sectional view of the cap and clamping part structure of the high-temperature flat small mold head proposed in this invention; Figure 13 This is an enlarged schematic diagram of part B of the high-temperature flat small mold head proposed in this invention; Figure 14 A schematic diagram of the structure of a finished injection-molded metal core wire; Figure 15 This is a schematic diagram of the structure of a traditional injection molding die head; Figure 16 This is a schematic diagram of the mold core and mold sleeve structure of a traditional injection molding die head.

[0019] In the diagram: 1. Mold core; 101. Thread hole; 102. Positioning head; 2. Mold sleeve; 201. Material outlet; 202. Limiting head; 3. Mechanism; 301. Injection groove; 302. Directional positioning pin; 303. Mechanism positioning screw; 304. Mechanism positioning pin; 4. Main body; 401. Connecting hole; 402. Main body heating coil; 5. Injection gap; 6. Buffer space; 601. Mold runner spacer; 7. Front end cover; 701. End cover fixing screw; 8. Pressure cap; 9. Flange; 901. Injection hole; 902. Flange heating coil; 903. Fastener; 10. Thread stabilizer Components: 1001, Load-bearing end seat; 1002, Magnetic suspension end head; 1003, Sealing cover; 1004, Hollow annular cavity; 1005, Samarium cobalt axial magnetic ring; 1006, Electromagnetic stator; 1007, Samarium cobalt axial stator magnetic ring; 1008, Nitrogen air pipe; 1009, Samarium cobalt rotor permanent magnet ring; 11, Tightening part; 1101, Guide circular groove; 1102, Hollow end seat; 1103, Synchronization end head; 1104, Guide rail; 1105, Crescent abutment; 1106, Elastic trigger; 1107, Mounting area; 1108, Heater; 1109, High-pressure chamber. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figures 1-16 The high-temperature flat small mold head includes a mold core 1 and a machine core 3. A mold sleeve 2 is fitted on the mold core 1, and a main body 4 is fitted on the machine core 3. Both the mold core 1 and the mold sleeve 2 are fitted in the machine core 3.

[0022] The mold core 1 and the mold sleeve 2 are respectively provided with a wire-passing hole 101 and a discharge hole 201 for conveying the metal core wire. The two ends of the wire-passing hole 101 are exposed from the two ends of the mold core 3 so that the metal core wire can pass through the mold core 3.

[0023] In some embodiments, the threading holes 101 can be arranged in multiple ways to form an extruded wiring structure.

[0024] The core 1 includes a wire stabilizing section 10 comprising a load-bearing end 1001 and a magnetic levitation end 1002. The wire stabilizing section 10 drives the metal core wire to rotate through a wire-passing hole 101 located in the magnetic levitation end 1002 to improve concentricity, aiming to actively improve the wrapping concentricity. The load-bearing end 1001 and the magnetic levitation end 1002 are rotatably connected, and a sealing cover 1003 is fixedly mounted on the load-bearing end 1001 and rotatably fitted onto the magnetic levitation end 1002. The wire stabilizing section 10 also includes a hollow annular cavity 1004, a samarium cobalt axial magnetic ring 1005, an electromagnetic stator 1006, a samarium cobalt axial stator magnetic ring 1007, a nitrogen air pipe 1008, and a samarium cobalt rotor permanent magnet ring 1009. The hollow annular cavity 1004 is opened in the load-bearing end seat 1001. It should be noted that the sealing cover 1003 is a dynamic seal, and its core function is to prevent the melt from leaking back from the joint between the mold core 1 and the stabilizing part 10 under high pressure and invading the precision magnetic levitation and rotation mechanism, thereby ensuring the long-term stable operation of the stabilizing part 10.

[0025] A nitrogen air pipe 1008 is fixedly installed in the hollow annular cavity 1004. In some embodiments, the nitrogen air pipe 1008 is used to set up a nitrogen air bearing system supporting the samarium cobalt rotor permanent magnet ring 1009. This requires the inner wall of the nitrogen air pipe 1008 to be highly smooth and the surface clean. Multiple micropores are evenly distributed circumferentially on the inner wall of the nitrogen air pipe 1008 for conveying nitrogen. A nitrogen inlet is also provided, which connects to an external high-precision pressure / flow control unit to provide clean, stable, slightly positive pressure nitrogen. It should be noted that ceramic sealing rings are located at both ends of the nitrogen air pipe 1008. These ceramic sealing rings seal the micron-level gap between the samarium cobalt rotor permanent magnet ring 1009 and the nitrogen air pipe 1008, achieving the goal of allowing the samarium cobalt rotor permanent magnet ring 1009 to rotate freely while minimizing gas leakage. This provides radial support and damping for the samarium cobalt rotor permanent magnet ring 1009.

[0026] The samarium cobalt rotor permanent magnet ring 1009 is rotatably mounted in the nitrogen air pipe 1008, and the samarium cobalt rotor permanent magnet ring 1009 rotates in contact with the magnetic suspension end 1002. It is worth noting that the main structure of the samarium cobalt rotor permanent magnet ring 1009 is made of high-temperature resistant, low-thermal-expansion coefficient hard alloy or ceramic. Its magnetic poles are arranged alternately to interact with the electromagnetic stator 1006 to generate rotational torque.

[0027] Samarium cobalt axial magnetic rings 1005 are installed at both ends of the samarium cobalt rotor permanent magnet rings 1009. It should be noted that the samarium cobalt rotor permanent magnet rings 1009 are positioned with their N poles facing each other to generate axial repulsive force.

[0028] The electromagnetic stator 1006 is fixedly installed on the hollow annular cavity 1004. In some implementation methods, a set of multiphase electromagnets arranged in a ring are used. After the frequency conversion current is passed through, a controllable rotating magnetic field is generated.

[0029] The electromagnetic stator 1006, when energized, generates a rotating magnetic field that drives the samarium cobalt rotor permanent magnet ring 1009 to rotate. This, in turn, causes the magnetic suspension end 1002, which is in contact with the rotor, to rotate synchronously. Ultimately, this causes the metal core wire within the threading hole 101 to slowly rotate around its own axis as it advances. This rotational motion actively counteracts any minor bends, uneven ellipticity, or surface defects that may exist in the metal core wire, ensuring consistent circumferential wrapping of the melt. This fundamentally improves the concentricity of the product and prevents electrical performance degradation caused by eccentricity.

[0030] Samarium cobalt axial stator magnetic rings 1007 are fixedly mounted at both ends of the hollow annular cavity 1004. In some embodiments, their magnetic field polarity is directed towards the samarium cobalt axial magnetic ring 1005 on the samarium cobalt rotor permanent magnet ring 1009, generating a repulsive force. These two pairs of magnetic rings together form a passive magnetic spring effect, used to stabilize the samarium cobalt rotor permanent magnet ring 1009 in the axial center position. The samarium cobalt rotor permanent magnet ring 1009 is suspended by nitrogen air bearings and axial magnetic rings, achieving completely non-contact support and drive. This helps to address wear, heat generation, and vibration issues present in mechanical bearings at high speeds and high temperatures, improving rotational smoothness and long-term operational reliability. The wear-resistant rubber ring further reduces wear between the magnetic suspension end 1002 and the rotor, serving as a safety redundancy while also improving the connection stability between the two.

[0031] An injection gap 5 is provided between the mold core 1 and the mold sleeve 2. During injection, the molten plastic flows in the injection gap 5 as a melt and contacts the metal core wire at the exit, enveloping it before being extruded through the discharge hole 201. The injection gap 5 is a critical area for forming the thickness of the enveloping layer, and its dimensional accuracy directly determines the uniformity of the product wall thickness. A positioning head 102 and a limiting head 202 are respectively provided at the head of the mold core 1 and the mold sleeve 2, with a buffer space 6 between them. The melt formed from the molten plastic waste flows to the metal core wire through the injection gap 5 and the buffer space 6. The buffer space 6, located at the front end of the injection gap 5, is an annular cavity, and its core function is: Pressure equalization and flow stabilization: This reduces the flow rate of the melt from the injection tank 301 and makes the pressure more even, avoiding fluctuations in the amount of glue dispensed due to uneven local pressure.

[0032] Eliminating weld lines: If the melt flows in from multiple injection tanks 301, the buffer space 6 provides sufficient fusion space for multiple melts, effectively eliminating weld lines and ensuring that the coating layer structure is dense and has consistent strength.

[0033] Compact design: By setting a buffer space 6, a good melt distribution effect can be achieved without significantly increasing the axial length of the die head, thereby achieving miniaturization and weight reduction of the die head.

[0034] The mechanism 3 has an injection tank 301 that connects to the buffer space 6, and the main body 4 has a connecting hole 401 that connects to the injection tank 301. The melt enters the injection tank 301 through the connecting hole 401 and then flows into the buffer space 6.

[0035] To facilitate the installation of the mold sleeve 2 within the mechanism 3, a pressure cap 8 is mounted on the mold sleeve 2, with its outer edge threaded to the mechanism 3. The pressure cap 8 contains a tightening part 11 that mates with the wire-stabilizing part 10. A guide groove 1101 is formed within the pressure cap 8. The tightening part 11 includes a synchronizing end 1103, a guide rail 1104, a crescent-shaped abutment 1105, a high-pressure chamber 1109, an elastic trigger 1106, an installation area 1107, and a heater 1108. The pressure cap 8, via the guide groove 1101, houses a hollow end seat 1102 for rotating the synchronizing end 1103. The tightening part 11 sprays a molding agent onto the molten metal core wire through the high-pressure chamber 1109 to smooth the surface. The driving energy is directly derived from the linear motion of the metal core wire itself, and through the frictional contact between the synchronizing end 1103 and the metal core wire, the linear motion is converted into rotational motion. In some embodiments, a pumping mechanism is employed, in which the rotating guide rail 1104 drives the crescent-shaped abutment 1105 thereon to periodically squeeze the elastic trigger 1106. Under this action, the elastic trigger 1106 intermittently compresses the deionized water / silicone oil / UV curing agent in the high-pressure chamber 1109, thereby forming a pulsed spray.

[0036] It should be noted that the appropriate molding agent should be selected according to the injection molding requirements of the metal core wire. This includes deionized water, silicone oil, and UV curing agents to achieve the desired effect. Deionized water is used for rapid cooling and shaping, and is especially suitable for crystalline plastics. It can refine the grains and improve the surface finish and mechanical strength of the metal core wire.

[0037] Dilute silicone oil emulsion, as a release lubricant, forms a nano-scale film on the surface of the melt, preventing it from sticking to the subsequent guide rollers and improving surface smoothness and gloss.

[0038] UV curing agents are used to trigger surface cross-linking reactions, which can instantly cure the surface layer and significantly improve the surface hardness and wear resistance of the melt after curing.

[0039] The function of heater 1108 is to ensure that the medium (especially silicone oil or curing agent) in the high-pressure chamber 1109 maintains a suitable working viscosity and activity, and to prevent it from condensing or clogging in the chamber.

[0040] The guide rail 1104 is rotatably fitted in the guide groove 1101, and the synchronous end 1103 is fixedly fitted in the guide rail 1104.

[0041] There are four crescent-shaped abutments 1105, which are circumferentially and equidistantly distributed on the guide rail 1104 to facilitate intermittent pressure application to the elastic trigger 1106 during rotation.

[0042] There are 2-6 high-pressure chambers 1109, which are equidistantly arranged around the synchronizing end 1103 on the hollow end seat 1102.

[0043] The elastic trigger 1106 is slidably fitted into the guide groove 1101 and the high-pressure chamber 1109, and the elastic trigger 1106 and the crescent block 1105 move against each other.

[0044] The installation area 1107 is located in the hollow end seat 1102 surrounding the synchronization end 1103.

[0045] The heater 1108 is installed in the hollow end seat 1102 through the mounting area 1107, and the heater 1108 is in contact with the high pressure chamber 1109. The heater 1108 is used to heat the deionized water, dilute silicone oil emulsion or UV curing agent sprayed through the high pressure chamber 1109.

[0046] The mold core 1 has a conical structure. To ensure that the core 3 and the main body 4 are easy to install and fit tightly, the core 3 and the main body 4 are precisely fitted with a conical structure and are fitted by a matching sleeve method of the conical structure.

[0047] The positioning head 102 is provided with a mold core positioning pin for fixing the limiting head 202.

[0048] A mold flow channel partition ring 601, which provides a supporting buffer space 6, is provided between the positioning head 102 and the limiting head 202. The mold core positioning pin passes through the mold flow channel partition ring 601. The buffer space 6 provides sufficient time for the melt to disperse inside the die head, which helps to solve the problem of needing to lengthen the die head due to uneven dispersion caused by the cone angle. This reduces the size of the die head and the amount of melt used. Under these conditions, the input of plastic waste can be effectively reduced, thereby reducing the pollution and waste caused by excessive consumption of plastic waste.

[0049] The core 3 is equipped with a directional positioning pin 302 for connecting the positioning head 102. The directional positioning pin 302 restricts the swing direction of the die core 1, thereby determining the exit swing direction of the extruded cable structure, which facilitates subsequent processing. The core 3 is also equipped with a core positioning screw 303 and a core positioning pin 304 for connecting the main body 4. The directional positioning pin 302 not only restricts the circumferential rotation of the die core 1, but more importantly, when used for extruding cables (multiple parallel cables), it can accurately set the arrangement direction of the extruded products, ensuring that the product shape meets the design requirements.

[0050] In some embodiments, a main body heating coil 402 is fitted onto the main body 4 to keep the molten plastic inside the main body 4 warm, maintain the plasticized state of the melt, and ensure its flow performance. In some embodiments, the main body heating coil 402 can be implemented using an electric heating wire. A front end cover 7 for fixing the main body heating coil 402 is provided on one side of the main body 4, and an end cover fixing screw 701 for fixing and connecting the main body 4 is installed in the front end cover 7.

[0051] In some embodiments, to connect the die head to the injection port of the injection molding machine for injection molding, a flange 9 is connected to the main body 4. The flange 9 has an injection hole 901 with a connecting hole 401. The injection molding machine performs injection molding through the injection hole 901. A flange heating coil 902 is fitted onto the flange 9, and fasteners 903 are installed on the flange heating coil 902 to securely connect to the main body 4. The flange heating coil 902 is used to keep the molten plastic inside the flange 9 warm, maintaining the plasticized state of the melt and ensuring its flow performance. The flange heating coil 902 can be implemented using an electric heating wire.

[0052] Wear-resistant rubber rings are provided on both the permanent magnet ring 1009 and the magnetic suspension end 1002 of the samarium cobalt rotor.

[0053] A zoned temperature control strategy is implemented using the main heating coil 402 and the flange heating coil 902, which, together with the heater 1108 in the tightening section 11, form a gradient temperature field, thereby achieving precise temperature control of the melt. Specifically, the flange 9 zone temperature is set higher to ensure good melt flowability after exiting the injection molding machine; the main body 4 zone temperature is set at the optimal processing temperature to ensure plasticization quality; and the tightening section 11 temperature setting is determined by the spraying medium. If a UV curing agent is used, a certain temperature must be maintained to prevent solidification. This ensures the melt is in an optimal thermal history state throughout the flow channel, avoiding degradation or flow instability caused by uneven temperature.

[0054] The high-pressure chamber 1109 has a three-way structure, and a one-way valve is provided in the outer port of the high-pressure chamber 1109 away from the guide groove 1101. According to the processing needs of metal core wire, the high-pressure chamber 1109 is filled with deionized water, dilute silicone oil emulsion or UV curing agent.

[0055] A comparative experiment was designed to compare the injection molding machine head with that of a traditional injection molding machine head. The control group used a traditional injection molding machine head, while the experimental group used a high-temperature flat small mold head (with an injection gap of 5, a buffer space of 6, a stabilizing part of 10, and a tightening part of 11).

[0056] The evaluation is based on the following factors: production efficiency (measures the number of qualified meters produced per unit time under the same injection pressure and linear speed), material utilization (statistical analysis of the total weight of gate waste and defective products due to quality issues generated during the production of fixed-length products), product concentricity (online measurement of the outer diameter at multiple points on the circumference of the product using a laser diameter gauge, calculating the difference between the maximum and minimum values, with a smaller value being better), surface roughness (measurement of the surface roughness of the finished cable using a surface roughness measuring instrument, with a smaller Ra value indicating a smoother surface), and stability assessment (observation and quantitative comparison of the vibration amplitude of the metal core wire at the die inlet during high-speed production using a high-speed camera). It can be known that: The buffer space 6 optimizes the melt flow path, reducing flow resistance and instability fluctuations, allowing for increased production line speed while maintaining quality. Simultaneously, the rapid cooling or fast curing function of the clamping section 11 shortens the time or distance required for product shaping. Combined, this results in an increase in production efficiency of approximately 15%-25%.

[0057] The pressure equalization and flow stabilization of the buffer space 6 and the elimination of weld lines, along with the ultra-high concentricity brought by the stabilizing part 10, reduce the scrap caused by uneven wall thickness, surface defects, etc., thereby greatly improving material utilization and significantly reducing production costs.

[0058] Based on the stabilizing section 10, non-contact, active rotational guidance of the metal core wire is achieved, solving the problem of vibration and displacement of the core wire caused by high-speed operation and its own stress in traditional machine heads.

[0059] The extremely high concentricity ensured by the stabilizing section 10 directly means that the thickness of the coating layer is highly consistent in the circumferential direction, achieving internal flatness. The tightening section 11, as an adaptive post-processing unit, can specifically solve problems such as uneven surface cooling, adhesion to the guide wheel, or soft surface by spraying deionized water (rapid cooling), silicone oil (lubrication), or UV curing agent (surface cross-linking), thereby obtaining a smooth, uniform, and high-quality surface appearance. The buffer space 6 ensures that the melt is fully fused and pressure balanced before molding, avoiding internal defects such as flow lines and weld lines, resulting in a dense product structure and superior mechanical strength.

[0060] It should be noted that the specific model and specifications of the mold core 1, mold sleeve 2, mechanism 3 and main body 4 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be elaborated here.

[0061] The functional principle of this invention can be explained through the following operational methods: The melt formed from plastic waste enters the injection tank 301 through the connection hole 401 and then flows into the buffer space 6.

[0062] The control unit 10 operates by introducing nitrogen into the nitrogen air pipe 1008. The nitrogen enters the nitrogen air pipe 1008 through a throttling orifice, forming a uniform gas film between the samarium cobalt axial stator magnetic ring 1007 and the nitrogen air pipe 1008. This film lifts the samarium cobalt rotor permanent magnet ring 1009, placing it in a radially aligned state. Simultaneously, the samarium cobalt axial magnetic rings 1005 at both ends generate a repulsive force, stabilizing the samarium cobalt axial stator magnetic ring 1007 axially. At the center, the electromagnetic stator 1006 generates a rotating magnetic field after being powered. This magnetic field interacts with the samarium cobalt rotor permanent magnet ring 1009 on the samarium cobalt axial stator magnetic ring 1007, driving the samarium cobalt axial stator magnetic ring 1007 to start rotating smoothly and slowly. The samarium cobalt axial stator magnetic ring 1007 and the driving magnetic suspension end 1002 rotate along the load-bearing end seat 1001 and the sealing cover 1003, so that the metal core wire is spirally advanced along the wire hole 101.

[0063] The metal core wire is wrapped through the injection gap 5 and extruded into a product through the discharge hole 201. A buffer space 6 is set to allow the melt to disperse sufficiently inside the die head.

[0064] The buffer space 6 is supported by the mold flow channel partition ring 601 and fixed by the mold core positioning pin, thereby limiting the size of the buffer space 6. The buffer space 6 can meet the requirement that the melt has enough time to disperse inside the die head.

[0065] The synchronous end 1103 rotates synchronously under the action of the metal core wire. The crescent block 1105 applies pressure to the elastic trigger 1106, so that the deionized water, dilute silicone oil emulsion or UV curing agent in the high-pressure chamber 1109 sprays the metal core wire covering the melt to smooth the melt and accelerate the shaping.

[0066] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature flat small mold head, comprising a mold core (1) and a machine core (3), wherein a mold sleeve (2) is fitted on the mold core (1), and a main body (4) is fitted on the machine core (3), wherein both the mold core (1) and the mold sleeve (2) are fitted within the machine core (3), characterized in that: The mold core (1) and the mold sleeve (2) are respectively provided with a wire-passing hole (101) and a discharge hole (201) for conveying the metal core wire. The mold core (1) is provided with a wire-stabilizing part (10) including a load-bearing end seat (1001) and a magnetic suspension end (1002). The wire-stabilizing part (10) drives the metal core wire to rotate through the wire-passing hole (101) in the magnetic suspension end (1002) to improve concentricity. An injection gap (5) is provided between the mold core (1) and the mold sleeve (2). A positioning head (102) and a limiting head (202) are respectively provided at the head of the mold core (1) and the mold sleeve (2). A buffer space (6) is provided between the positioning head (102) and the limiting head (202). The melt formed by melting plastic waste flows to the metal core wire through the injection gap (5) and the buffer space (6). The mechanism (3) has an injection groove (301) that connects to the buffer space (6), and the main body (4) has a connecting hole (401) that connects to the injection groove (301). The mold sleeve (2) is equipped with a pressure cap (8), and the pressure cap (8) is provided with a tightening part (11) that matches the wire stabilizing part (10). The tightening part (11) includes a synchronous end (1103) and a high-pressure chamber (1109). The tightening part (11) sprays a plasticizer onto the melt covering the metal core wire through the high-pressure chamber (1109) to smooth the surface.

2. The high-temperature flat small mold head according to claim 1, characterized in that, The mold core (1) has a conical structure.

3. The high-temperature flat small mold head according to claim 2, characterized in that, The positioning head (102) is provided with a mold core positioning pin for fixing the limiting head (202).

4. The high-temperature flat small mold head according to claim 3, characterized in that, A mold flow channel partition ring (601) supporting the buffer space (6) is provided between the positioning head (102) and the limiting head (202), and the mold core positioning pin passes through the mold flow channel partition ring (601).

5. The high-temperature flat small mold head according to claim 4, characterized in that, The mechanism (3) is provided with a directional positioning pin (302) for connecting the positioning head (102), and the mechanism (3) is provided with a mechanism positioning screw (303) and a mechanism positioning pin (304) for connecting the main body (4).

6. The high-temperature flat small mold head according to claim 5, characterized in that, The load-bearing end seat (1001) is rotatably connected to the magnetic levitation end head (1002), and a sealing cover (1003) rotatably fitted onto the magnetic levitation end head (1002) is fixedly installed on the load-bearing end seat (1001). The stabilizing part (10) further includes: A hollow annular cavity (1004) is formed in the load-bearing end seat (1001); A nitrogen air tube (1008) is fixedly installed in a hollow annular cavity (1004); Samarium cobalt rotor permanent magnet ring (1009), wherein the samarium cobalt rotor permanent magnet ring (1009) is rotatably installed in a nitrogen air pipe (1008), and the samarium cobalt rotor permanent magnet ring (1009) rotates in contact with the magnetic suspension end (1002).

7. The high-temperature flat small mold head according to claim 6, characterized in that, Wear-resistant rubber rings are provided on both the permanent magnet ring (1009) and the magnetic suspension end (1002) of the samarium cobalt rotor.

8. The high-temperature flat small mold head according to claim 7, characterized in that, The pressure cap (8) has a guide groove (1101) and the pressure cap (8) has a hollow end seat (1102) for the rotating sleeve synchronous end (1103) set through the guide groove (1101).

9. The high-temperature flat small mold head according to claim 8, characterized in that, The number of high-pressure chambers (1109) is 2-6, and the 2-6 high-pressure chambers (1109) are equidistantly arranged around the synchronization end (1103) on the hollow end seat (1102).

10. The high-temperature flat small mold head according to claim 9, characterized in that, The high-pressure chamber (1109) has a three-way structure, and a one-way valve is provided in the outer port of the high-pressure chamber (1109) away from the guide groove (1101).

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