Cable core covering molding device and molding method

Abstract

The present invention relates to the technical field of cable processing and sheathing, and specifically to a cable core sheathing molding device and molding method, comprising an extrusion head mold and an extruder, the extrusion head mold having a sheathing channel for the cable to pass through, an annular melt cavity surrounding the sheathing channel, and an annular extrusion port connecting the annular melt cavity and the sheathing channel, when the cable passes through the sheathing channel, the annular extrusion port coats the outer periphery of the cable with a melt of the same thickness as the opening width of the annular extrusion port, a feed port is provided on the extrusion head mold, the feed port is connected to the annular melt cavity, an annular sliding seat and an adjustment component are provided in the extrusion head mold, the thickness of the cable insulation layer is controlled by adjusting the diameter of the annular extrusion port, so that the diameter of the annular extrusion port can be accurately adjusted as needed, thereby effectively controlling the sheathing thickness of the cable core, solving the problem that the existing cable sheathing molding device cannot accurately and stably control the sheathing thickness during the sheathing process.

Description

Technical Field

[0001] The present invention relates to the technical field of cable processing and coating, and in particular to a cable core coating molding device and a molding method. Background Art

[0002] The cable core overmolding device is a device used to manufacture cables. It usually consists of an outer shell and internal working parts. The function of this device is to cover the cable core with metal or plastic materials to form an insulation layer and a protective layer to provide insulation performance and mechanical strength of the cable. By controlling the process parameters and the flow of the material, the cable core overmolding device can accurately cover the material on the cable core and ensure its molding quality.

[0003] Existing cable core overmolding equipment requires varying insulation thicknesses due to the varying specifications and thicknesses of cable cores. This presents challenges in practical application, as the same equipment struggles to adjust the thickness for varying cable core thicknesses, limiting processing flexibility and adaptability. This limitation can make it difficult to meet the specific insulation requirements of different cable core types, limiting its scope and efficiency.

[0004] Chinese patent publication number CN117316545B discloses a cable core overmolding device and method for cable processing, specifically relating to the field of cable processing overmolding technology, including a coating material holding pipe, the outer wall of which is vertically slidably connected to an adjustment ring, and the outer wall of the adjustment ring is provided with a thickness adjustment expansion mechanism.

[0005] The forming device adjusts the thickness of the insulation layer through a thickness adjustment and expansion mechanism. An adjustment ring drives multiple concave rotating blocks downward, which in turn causes multiple adjustment arc blocks to push the silicone rubber expansion molding cylinder outward. The elastic force causes the inner diameter of the silicone rubber expansion molding cylinder to expand. When the expanded diameter of the silicone rubber expansion molding cylinder matches the cable core wrapping diameter set by the controller, the controller turns off the servo reduction motor, completing the insulation wrapping of cables of varying diameters.

[0006] However, as a flexible material, silicone rubber may deform due to its physical properties when high-pressure and high-temperature melt passes through it. This deformation may lead to a decrease in the control accuracy of the coating thickness, making it difficult to achieve uniform and precise insulation layer coating. Specifically, when the temperature and pressure of the melt are too high, the elasticity and rigidity of the silicone rubber material may be insufficient, causing the molding cylinder to deform under high-temperature and high-pressure conditions, thereby affecting the thickness of the final coating layer. This problem is particularly prominent under high-temperature and high-pressure operating conditions, which will make the thickness control during the coating process unstable, thereby affecting the quality and consistency of the product. Therefore, solving the deformation problem of the silicone rubber expansion molding cylinder under high-pressure and high-temperature melt is crucial to improving the processing accuracy and reliability of the molding device. Summary of the Invention

[0007] In response to the above problems, a cable core covering molding device and molding method are provided. By movably setting an annular sliding seat in the extrusion head mold and combining an adjustment component to adjust the diameter of the annular extrusion port, structural stability and high-precision control are achieved, so that the diameter of the annular extrusion port can be accurately adjusted as needed, thereby effectively controlling the covering thickness of the cable core, solving the problem that the existing cable covering molding device cannot accurately and stably control the covering thickness during the covering process.

[0008] In order to solve the problems of the prior art, the present invention provides a cable core covering molding device, comprising an extrusion head mold and an extruder for injecting high-pressure melt into the extrusion head mold. The extrusion head mold has a covering channel for the cable to pass through, an annular melt cavity surrounding the covering channel, and an annular extrusion port connecting the annular melt cavity and the covering channel. When the cable passes through the covering channel, the annular extrusion port covers the outer periphery of the cable with a melt having a thickness equal to the width of the annular extrusion port opening. The extrusion head mold is provided with a feed port extending along its radial direction. The material port is connected with the annular melt cavity, the injection port of the extruder is connected with the feed port, and the extrusion head mold is provided with an annular sliding seat coaxial with the coating channel, and an adjustment component for driving the annular sliding seat to move along its axial direction. The annular sliding seat is hollow and coaxially connected with the coating channel. An annular melt cavity and an annular extrusion port are formed between the annular sliding seat and the inner end of the extrusion head mold. The diameter of the annular extrusion port expands as the distance between the annular sliding seat and the inner end of the extrusion head mold increases. The thickness of the cable insulation layer is controlled by adjusting the diameter of the annular extrusion port.

[0009] Preferably, the annular sliding seat is coaxially threadedly screwed to the inner wall of the extrusion head mold. When the annular sliding seat rotates relative to the extrusion head mold, the annular sliding seat moves in the extrusion head mold along the axial direction of the coating channel. One end of the adjusting component is connected to the outer end of the annular sliding seat, and the other end of the adjusting component extends to the outside of the extrusion head mold along the axial direction of the coating channel. By rotating the adjusting component relative to the exposed part of the extrusion head, the annular sliding seat is guided to move in the axial direction of the coating channel in the extrusion head mold.

[0010] Preferably, the outer end of the annular sliding seat is provided with an inner gear cylinder coaxial therewith, and the inner gear cylinder is threadedly connected to the inner wall of the extrusion head mold. The adjustment assembly includes a fixed ring, a driving cylinder, an outer gear ring and a gear. The fixed ring is coaxially fixedly arranged at one end of the extrusion head mold, the driving cylinder is coaxially rotatably arranged in the inner mouth of the fixed ring, one end of the driving cylinder extends into the covering channel, and the other end of the driving cylinder extends to the outside of the fixed ring, the outer gear ring is coaxially fixedly arranged at the inner end of the driving cylinder, and the gear is rotatably arranged along the circumference of the driving cylinder. The gear is located between the outer side of the outer gear ring and the inner side of the inner gear cylinder, and the gears are respectively engaged with the outer gear ring and the inner gear cylinder.

[0011] Preferably, the outer end of the driving cylinder is provided with a driving ring coaxial therewith, and the outer circumferential surface of the driving ring is provided with a driving handle extending along its radial direction, and the end of the driving handle extends to the outside of the extrusion head mold.

[0012] Preferably, the molding device also includes an air pump, an annular air cavity is also provided in the extrusion head mold, and an air flow guiding rotating member is coaxially arranged in the coating channel. The extrusion head mold is also provided with an air inlet connected to the annular air cavity, and the air inlet is connected to the air outlet of the air pump. The annular air cavity is located on the side of the annular melt cavity discharge, and the air flow guiding rotating member is located on the side of the annular extrusion port discharge. The air flow guiding rotating member is hollow and connected to the coating channel. The air flow guiding rotating member is provided with an air outlet groove connecting its inner cavity and the annular air cavity. The air pump pumps gas into the annular air cavity. When the gas passes through the air outlet groove from the annular air cavity and enters the coating channel, the air flow guiding rotating member rotates in the coating channel.

[0013] Preferably, a cylindrical mounting groove coaxial with the enclosing channel is also provided in the covering channel, and the airflow guiding rotating member includes a rotating cylinder coaxially rotatably arranged in the cylindrical mounting groove, an air passage is formed between the outer circumferential surface of the rotating cylinder and the inner wall of the cylindrical mounting groove, and arc-shaped guide vanes distributed along its circumference are provided on the outer circumferential surface of the rotating cylinder, and the air outlet grooves are distributed circumferentially on the outer circumferential surface of the rotating cylinder, and the outer edges of the arc-shaped guide vanes are gap-matched with the inner wall of the cylindrical mounting groove, and an annular air outlet connected to the air passage is provided on the inner side of the annular air cavity, and the air outlet groove is located on the side where the arc-shaped guide vanes deviate from the annular air outlet. When the gas in the annular air cavity passes through the annular outlet, the air passage and the air outlet groove in sequence, the rotating cylinder rotates under the condition that the arc-shaped guide vanes have airflow action.

[0014] Preferably, the extrusion head mold includes a base body and an end body connected to the base body. The melt cavity is located in the base body, and an annular air cavity is formed between the base body and the end body. An annular connecting groove 1 is provided at one end of the base body, and an annular connecting groove 2 is provided at one end of the inner circumferential surface of the end body. The two ends of the rotating cylinder are coaxially connected to the annular connecting groove 1 and the annular connecting groove 2 respectively.

[0015] Preferably, the overmolding device also includes a positioning mechanism arranged at the feed end of the extrusion head mold, the positioning mechanism having a bypass opening for the cable to pass through, positioning wheels that can be arranged circumferentially along the bypass opening, and a driving member for driving all positioning wheels to move synchronously along the radial direction of the bypass opening.

[0016] Preferably, there are two positioning wheels, and an annular arc groove coaxial with the positioning wheel is provided on the outer circumference of the positioning wheel. The positioning mechanism also includes a fixed plate and two supports. The fixed plate is fixedly arranged at the feed end of the extrusion head mold, and the avoidance port is located at the center position of the fixed plate. The two supports are arranged on the fixed plate to slide toward or away from each other along the radial direction of the avoidance port. The two positioning wheels are rotatably arranged on the two supports respectively, and a guide column is provided on the support that passes through the fixed plate and slides with it. The driving member includes an adjusting ring that is coaxially rotatably arranged at the other end of the fixed plate, and the adjusting ring is provided with a guide groove that deviates from its radial direction. The guide column extends into the guide groove and slides with it. An adjusting cylinder coaxial with it is provided on the outer circumference of the adjusting ring, and the adjusting cylinder is threadedly connected to the outer circumference of the fixed plate. A connecting column extending along its axial direction and connected to the extrusion head mold is provided on the fixed plate, and an arc groove that slides with the connecting column is provided on the adjusting ring.

[0017] A cable core overmolding method is implemented by a cable core overmolding device, and the molding method comprises the following steps:

[0018] Step 1: The cable core is coaxially passed through the coating channel of the extrusion head die, and the cable core is pulled to move in the coating channel;

[0019] Step 2: Adjust the position of the annular sliding seat in the extrusion head through the adjustment component as needed to adjust the diameter of the annular extrusion port.

[0020] Step three: start the extruder and inject the molten material into the annular molten material cavity. When the cable core passes through the extrusion head, the annular extrusion port covers the cable core with a fixed thickness of molten material.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] Precise control of coating thickness: By adjusting the position of the annular sliding seat, the diameter of the annular extrusion port can be precisely controlled, thereby accurately adjusting the thickness of the cable insulation layer. This ensures the uniformity and consistency of the coating layer and improves product quality.

[0023] Uniform Coating: The rotating drum achieves stable rotation through the airflow of curved guide vanes, which not only optimizes airflow distribution but also enhances the precision of the molding process. The air flows through the rotating drum through multiple stages, including an annular outlet, air passages, and outlet slots, ensuring uniform coating of the molten material on cables of varying diameters. This efficient airflow guidance and rotary drive mechanism enables the molding device to produce high-quality, consistent cable insulation.

[0024] Enhanced adaptability: The adjustable ring sliding seat design allows the equipment to handle cable cores of different diameters and specifications, improving the versatility and flexibility of the equipment.

[0025] Stable processing: The stable structural design and precise control system of the equipment ensure stable operation under high temperature and high pressure conditions, reducing production interruptions caused by equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional diagram of an extrusion head die in a cable core overmolding device.

[0027] Figure 2 It is a side view of the extrusion head die in a cable core overmolding device.

[0028] Figure 3 The present invention is a three-dimensional cross-sectional view of an extrusion head die in a cable core overmolding device.

[0029] Figure 4 The present invention is a cross-sectional view of an extrusion head die in a cable core overmolding device.

[0030] Figure 5 It is a three-dimensional exploded view of a positioning mechanism in a cable core overmolding device.

[0031] Figure 6 It is a three-dimensional exploded view of the extrusion head mold in the cable core overmolding device at a first viewing angle.

[0032] Figure 7 It is a three-dimensional exploded view of the extrusion head mold in the cable core overmolding device from a second perspective.

[0033] Figure 8 It is a three-dimensional exploded view of the adjustment component in the cable core overmolding device.

[0034] Figure 9 The present invention is a stereoscopic view of an airflow guide in a cable core overmolding device from a first perspective.

[0035] Figure 10The present invention is a stereoscopic view of an airflow guide in a cable core overmolding device from a second viewing angle.

[0036] The numbers in the figure are: 1, extrusion head mold; 111, coating channel; 112, annular melt cavity; 113, annular extrusion port; 114, feed port; 12, annular sliding seat; 121, inner ring gear; 13, adjustment assembly; 131, fixed ring; 132, drive cylinder; 1321, drive ring; 133, outer ring gear; 134, gear; 135, drive handle; 141, annular air cavity; 1411, annular air outlet; 142, air inlet ;15. Air flow guide;151. Air outlet groove;152. Rotating cylinder;153. Arc-shaped guide vane;16. Cylindrical mounting groove;17. Seat body;18. End body;2. Positioning mechanism;21. Avoidance port;22. Positioning wheel;221. Annular arc-shaped groove;231. Adjusting ring;2311. Guide groove;2312. Arc-shaped groove;232. Adjusting cylinder;24. Fixed plate;241. Connecting column;25. Support;251. Guide column. DETAILED DESCRIPTION

[0037] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, this application provides:

[0039] A cable core coating molding device includes an extrusion head mold 1 and an extruder for injecting high-pressure melt into the extrusion head mold 1. The extrusion head mold 1 has a coating channel 111 for the cable to pass through, an annular melt cavity 112 surrounding the coating channel 111, and an annular extrusion port 113 connecting the annular melt cavity 112 and the coating channel 111. When the cable passes through the coating channel 111, the annular extrusion port 113 coats the outer periphery of the cable with a melt having a thickness equal to the opening width of the annular extrusion port 113. The extrusion head mold 1 is provided with a feed port 114 extending along its radial direction, and the feed port 114 is connected to the annular melt cavity 112. The injection port of the extruder is connected to the feed port 114, and the extrusion head mold 1 is provided with an annular sliding seat 12 coaxial with the coating channel 111, and an adjusting component 13 for driving the ring 1321-shaped sliding seat 12 to move along its axial direction. The annular sliding seat 12 is hollow and coaxially connected to the coating channel 111. An annular melt cavity 112 and an annular extrusion port 113 are formed between the annular sliding seat 12 and the inner end of the extrusion head mold 1. The diameter of the annular extrusion port 113 expands as the distance between the annular sliding seat 12 and the inner end of the extrusion head mold 1 increases. The thickness of the cable insulation layer is controlled by adjusting the diameter of the ring 231-shaped extrusion port 113.

[0040] The extrusion head mold 1 is designed with a coating channel 111 that allows the passage of a cable. An annular melt cavity 112 is set around the coating channel 111, and the melt cavity is connected to the coating channel 111 through an annular extrusion port 113. When the cable passes through the coating channel 111, the opening width of the annular extrusion port 113 determines the coating thickness of the cable periphery, ensuring that the molten material evenly covers the cable. The extrusion head mold 1 is provided with a feed port 114 extending radially, which is connected to the annular melt cavity 112. At the same time, the injection molding port of the extruder is connected to the feed port 114, thereby realizing high-pressure injection of the molten material. An annular sliding seat 12 coaxial with the coating channel 111 is also provided in the extrusion head mold 1. This annular sliding seat 12 is hollow and coaxially connected to the coating channel 111. To achieve precise control of the annular sliding seat 12, the device is equipped with an adjustment assembly 13 for driving the ring 1321-shaped sliding seat 12 to move along its axial direction. An annular melt chamber 112 and an annular extrusion port 113 are formed between the annular sliding seat 12 and the inner end of the extrusion head die 1. As the distance between the annular sliding seat 12 and the inner end of the extrusion head die 1 increases, the diameter of the annular extrusion port 113 also increases. This design precisely controls the thickness of the cable insulation layer by adjusting the diameter of the ring 231-shaped extrusion port 113, ensuring that the coating process of cable cores of different specifications can meet the predetermined thickness requirements, significantly improving the stability and consistency of the coating process.

[0041] like Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, the annular sliding seat 12 is coaxially threadedly screwed with the inner wall of the extrusion head mold 1. When the annular sliding seat 12 rotates relative to the extrusion head mold 1, the annular sliding seat 12 moves along the axial direction of the coating channel 111 in the extrusion head mold 1. One end of the adjusting component 13 is connected to the outer end of the annular sliding seat 12, and the other end of the adjusting component 13 extends along the axial direction of the coating channel 111 to the outside of the extrusion head mold 1. By rotating the adjusting component 13 relative to the exposed part of the extrusion head, the annular sliding seat 12 is guided to move along the axial direction of the coating channel 111 in the extrusion head mold 1.

[0042] The annular sliding seat 12 is coaxially threadedly connected to the inner wall of the extrusion head die 1. This design enables the annular sliding seat 12 to move precisely along the axis of the coating channel 111 within the extrusion head die 1. When the annular sliding seat 12 rotates relative to the extrusion head die 1, the thread structure causes it to move back and forth in the axial direction of the coating channel 111, thereby adjusting the diameter of the annular extrusion port 113.

[0043] One end of the adjustment assembly 13 is fixedly connected to the outer end of the annular sliding seat 12, while the other end of the adjustment assembly 13 extends axially along the coating channel 111 to the outside of the extrusion head die 1. By rotating the adjustment assembly 13, the annular sliding seat 12 can be guided to move along the axis of the coating channel 111 within the extrusion head die 1 relative to the exposed portion of the extrusion head die 1. This adjustment method provides convenient operation and allows precise control of the opening width of the annular extrusion port 113, thereby achieving accurate adjustment of the cable insulation thickness.

[0044] like Figure 6 and Figure 7 As shown, the outer end of the annular sliding seat 12 is provided with an inner gear cylinder coaxial therewith, and the inner gear cylinder is threadedly connected to the inner wall of the extrusion head mold 1, and the adjusting assembly 13 includes a fixing ring 131, a driving cylinder 132, an outer gear ring 133 and a gear 134. The fixing ring 131 is coaxially fixedly arranged at one end of the extrusion head mold 1, and the driving cylinder 132 is coaxially rotatably arranged in the inner mouth of the fixing ring 131. One end of the driving cylinder 132 extends into the covering channel 111, and the other end of the driving cylinder 132 extends to the outside of the fixing ring 131. The outer gear ring 133 is coaxially fixedly arranged at the inner end of the driving cylinder 132, and the gear 134 is rotatably arranged at the inner end of the fixing ring 131 along the circumference of the driving cylinder 132. The gear 134 is located between the outer side of the outer gear ring 133 and the inner side of the inner gear cylinder, and the gear 134 is respectively engaged with the outer gear ring 133 and the inner gear cylinder.

[0045] The reduction gear 134 transmission system allows for more precise adjustment of the position of the annular sliding seat 12, which is shaped like an annular 231. Specifically, the outer end of the annular sliding seat 12 is equipped with a coaxial internal gear cylinder, which is threadedly connected to the inner wall of the extrusion head die 1. The adjustment assembly 13 consists of several key components, including a fixed ring 131, a drive cylinder 132, an outer gear ring 133, and a gear 134. These components work together to achieve precise adjustment of the annular sliding seat 12.

[0046] A retaining ring 131 is coaxially fixed to one end of the extrusion head die 1, forming the base of the system. A drive cylinder 132 is coaxially positioned within the inner opening of retaining ring 131 and is rotatable relative to it. One end of drive cylinder 132 extends into the interior of sheathing channel 111, while the other end extends outside retaining ring 131. An outer gear ring 133 is coaxially fixed to the inner end of drive cylinder 132, and its gear 134 structure integrates the reduction gear function of the gear 134 system.

[0047] Gear 134 is positioned at the inner end of fixed ring 131, circumferentially around drive cylinder 132. Gear 134 rotates between the outer side of outer ring gear 133 and the inner side of the inner gear cylinder. Gear 134 precisely meshes with outer ring gear 133 and the inner gear cylinder to achieve precise control of drive cylinder 132. This gear 134 reduction transmission system significantly improves the accuracy of adjusting the position of ring 231-shaped sliding seat 12, enabling more precise adjustment of the opening width of annular extrusion port 113, thereby ensuring the consistency and stability of the cable insulation thickness.

[0048] like Figure 6 、 Figure 7 and Figure 8 As shown, the outer end of the driving cylinder 132 is provided with a driving ring 1321 coaxial therewith, and the outer circumferential surface of the driving ring 1321 is provided with a driving handle 135 extending along its radial direction, and the end of the driving handle 135 extends to the outside of the extrusion head mold 1.

[0049] The outer end of the drive cylinder 132 is equipped with a coaxial drive ring 1321 therewith, and this drive ring 1321 has an outer circumferential surface, on which a drive handle 135 extending radially thereof is provided. The design of the drive handle 135 makes it possible to operate and adjust it from the outside of the extrusion head die 1 easily.

[0050] The coaxial structure of the drive ring 1321 and the drive cylinder 132 ensures stability and synchronization during operation. The drive handle 135 extends radially along the drive ring 1321, with its end extending beyond the exterior of the extrusion head die 1, facilitating adjustments from outside the machine. By rotating the drive handle 135, the drive ring 1321 drives the drive cylinder 132 via the gear 134 reduction gear system, thereby precisely adjusting the position of the annular slide 12 within the extrusion head die 1.

[0051] This design not only provides a user-friendly interface, making the adjustment process more intuitive and convenient, but also ensures precision during adjustment. The extended drive handle 135 allows the operator to easily adjust the position without having to directly access the interior of the extrusion head mold 1, which improves operational safety and convenience. Overall, this structural design improves the controllability and work efficiency of the equipment, providing higher precision and reliability for the cable core overmolding process.

[0052] like Figure 4As shown, the molding device also includes an air pump, an annular air cavity 141 is also provided in the extrusion head mold 1, and an air flow guiding rotating member is coaxially arranged in the coating channel 111, and an air inlet 142 connected to the annular air cavity 141 is also provided on the extrusion head mold 1, and the air inlet 142 is connected to the air outlet of the air pump, the annular air cavity 141 is located on the side where the annular melt cavity 112 discharges the material, and the air flow guiding rotating member is located on the side where the annular extrusion port 113 discharges the material, the air flow guiding rotating member is hollow and connected to the coating channel 111, and an air outlet groove 151 connecting its inner cavity and the annular air cavity 141 is provided on the air flow guiding rotating member, and the air pump pumps gas into the annular air cavity 141, and when the gas passes through the air outlet groove 151 from the annular air cavity 141 into the coating channel 111, the air flow guiding rotating member rotates in the coating channel 111.

[0053] The molding device also features an efficient airflow system, comprised of an air pump, an annular air cavity 141, and an airflow guide rotor. This system optimizes uniform coverage of the melt on cables of varying diameters. The air pump delivers gas to the annular air cavity 141 through an air inlet 142, while the airflow path between the annular air cavity 141 and the airflow guide rotor is precisely designed to ensure stable gas distribution and effective guidance.

[0054] The annular air cavity 141 in the extrusion head mold 1 is located on the discharge side of the annular melt cavity 112 and is connected to the air pump through the air inlet 142. The air pump continuously delivers gas into the annular air cavity 141, forming a stable airflow foundation. The airflow guiding rotor is coaxially arranged in the coating channel 111 and is designed as a hollow structure, which enables it to communicate with the coating channel 111. The inner cavity of the airflow guiding rotor is connected to the annular air cavity 141 through the air outlet groove 151, ensuring that the gas can flow smoothly into the coating channel 111.

[0055] As gas flows from annular air cavity 141 through outlet groove 151 and into coating channel 111, the airflow-guiding rotating member rotates within coating channel 111. This rotational motion evenly distributes the airflow within coating channel 111, ensuring uniform coating of the molten material on the cable surface. The rotating airflow not only promotes stable distribution of the molten material but also adaptively adjusts its direction and intensity based on cable diameter, achieving stable coating of molten material of varying thicknesses.

[0056] This design allows the airflow to automatically adjust to the cable diameter, ensuring uniform coating of the molten material on cables of various diameters without uneven thickness or bubbles. This precise airflow control improves the uniformity and stability of the coating, resulting in higher consistency and quality of the final cable insulation.

[0057] In general, the optimized design of this airflow system not only improves the coverage efficiency of the molten material, but also enhances the adaptability to cables of different specifications, providing a reliable guarantee for high-quality cable production.

[0058] like Figure 4 、 Figure 9 and Figure 10 As shown, the sheathing channel 111 is also provided with a cylindrical mounting groove 16 coaxial therewith, and the airflow guiding rotating member includes a rotating cylinder 152 coaxially rotatably arranged in the cylindrical mounting groove 16, and an air passage is formed between the outer circumferential surface of the rotating cylinder 152 and the inner wall of the cylindrical mounting groove 16, and an arc-shaped guide plate 153 distributed along its circumference is provided on the outer circumferential surface of the rotating cylinder 152, and the air outlet groove 151 is distributed circumferentially on the outer circumferential surface of the rotating cylinder 152, and the outer edge of the arc-shaped guide plate 153 is gap-matched with the inner wall of the cylindrical mounting groove 16, and an annular air outlet 1411 connected to the air passage is provided on the inner side of the annular air cavity 141, and the air outlet groove 151 is located on the side of the arc-shaped guide blade deviating from the annular air outlet 1411. When the gas in the annular air cavity 141 passes through the annular air outlet 1411, the air passage and the air outlet groove 151 in sequence, the rotating cylinder 152 rotates under the condition that the arc-shaped guide blade has airflow action.

[0059] To achieve uniform coating of the molten material in the molding device, a complex and sophisticated airflow guidance system is designed within the coating channel 111. A coaxial cylindrical mounting groove 16 is provided within the coating channel 111, providing support for the installation and rotation of the rotating cylinder 152. The airflow guidance rotating member includes a rotating cylinder 152 coaxially disposed within the cylindrical mounting groove 16. A gas passage is formed between the outer circumference of the rotating cylinder 152 and the inner wall of the cylindrical mounting groove 16, providing a stable path for gas flow.

[0060] The outer circumference of the rotating cylinder 152 is equipped with a plurality of arc-shaped guide vanes 153 distributed along its circumference. These design not only guides the airflow but also provides a rotational propulsion mechanism. Gas flows from the annular air cavity 141 through the annular outlet 1411 into the air passage, then through the outlet grooves 151 on the outer circumference of the rotating cylinder 152, ultimately being released into the enveloping passage 111. The arc-shaped guide vanes 153 play a crucial role in this process.

[0061] When airflow acts on the curved guide vanes 153 along the axial direction of the rotating cylinder 152, the pressure and velocity of the airflow impact the curved guide vanes 153, generating a certain rotational torque. A clearance fit exists between the outer edge of the curved guide vanes 153 and the inner wall of the cylindrical mounting slot 16. This design allows the airflow to efficiently propel the rotation of the curved guide vanes 153. The geometric shape of the curved guide vanes 153 and the force of the airflow together determine the rotational direction and speed of the rotating cylinder 152.

[0062] Under the influence of the airflow, the arc-shaped guide vanes 153 convert the kinetic energy of the airflow into a rotational force on the rotating drum 152, causing the rotating drum 152 to rotate stably within the cylindrical mounting groove 16. The rotation of the rotating drum 152 drives the gas to be evenly distributed along its circumference, thus ensuring uniform coating of the molten material in the coating channel 111. Because the gas outlet grooves 151 are distributed along the circumference of the rotating drum 152, this design allows the gas to be effectively guided during the rotation of the rotating drum 152, avoiding localized airflow concentration and thus improving the uniformity of the molten material coating.

[0063] In summary, the rotating drum 152 achieves stable rotation through the airflow of the curved guide vanes 153, which not only optimizes airflow distribution but also enhances the precision of the molding process. The gas flows through the rotating drum 152 in multiple steps, including the annular outlet 1411, the air passage, and the outlet groove 151, ensuring uniform coating of the molten material on cables of varying diameters. Through this efficient airflow guidance and rotational drive mechanism, the molding device achieves high-quality, highly consistent production of cable insulation.

[0064] like Figure 4 As shown, the extrusion head mold 1 includes a base body 17 and an end body 18 connected to the base body 17. The melt cavity is located in the base body 17. An annular air cavity is formed between the base body 17 and the end body 18. An annular connecting groove 1 is provided at one end of the base body 17, and an annular connecting groove 2 is provided at one end of the inner circumference of the end body 18. The two ends of the rotating cylinder 152 are coaxially connected to the annular connecting groove 1 and the annular connecting groove 2 respectively.

[0065] The mold primarily consists of a base body 17 and an end body 18 connected to it. Base body 17 is the mold's foundational structure, housing a melt chamber for storing and conveying molten material. The melt chamber ensures even distribution and good fluidity during extrusion. To further optimize mold performance, an annular air cavity is formed between base body 17 and end body 18.

[0066] An annular connecting groove 1 is provided at one end of the base body 17. This annular connecting groove is designed to precisely mate with the end of the rotating cylinder 152, ensuring a tight and stable fit. An annular connecting groove 2 is provided at one end of the inner circumference of the end body 18. The annular connecting groove 2 is symmetrical with the annular connecting groove 1 and is also designed to coaxially connect with the other end of the rotating cylinder 152.

[0067] The two ends of the rotating drum 152 are respectively coaxially connected to the annular connecting groove 1 and the annular connecting groove 2. This coaxial connection ensures that the rotating drum 152 can rotate smoothly during the extrusion process and avoids rotation imbalance caused by asymmetric force.

[0068] like Figure 5 As shown, the overmolding device also includes a positioning mechanism 2 arranged at the feed end of the extrusion head mold 1, the positioning mechanism 2 having a bypass opening 21 for the cable to pass through, and positioning wheels 22 that can be arranged circumferentially along the bypass opening 21, and a driving member for driving all the positioning wheels 22 to move synchronously along the radial direction of the bypass opening 21.

[0069] The overmolding device also includes a positioning mechanism 2 disposed at the feed end of the extrusion head die 1. This positioning mechanism 2 ensures that the cable can be accurately positioned and passed smoothly during entry into the extrusion head die 1. The positioning mechanism 2 has a clearance opening 21, the design size and location of which allow the cable to pass smoothly without obstruction. To further ensure the stability and precise positioning of the cable, the positioning mechanism 2 is equipped with a plurality of positioning wheels 22 that can be arranged circumferentially along the clearance opening 21. The arrangement of these positioning wheels 22 can be adjusted according to actual needs to accommodate cables of different diameters and specifications. The function of the positioning wheels 22 is to provide the necessary support and guidance for the cable to maintain the correct path when passing through the extrusion head die 1, thereby avoiding uneven coating or other quality issues caused by positional offset. To achieve synchronous movement of all positioning wheels 22, the positioning mechanism 2 is also equipped with a drive member for driving all positioning wheels 22 to move synchronously in the radial direction of the clearance opening 21. The design of the drive member enables each positioning wheel 22 to move in a coordinated and consistent manner along the radial direction of the clearance opening 21, thereby achieving precise centering and stable transmission of the cable. This synchronized movement mechanism not only improves the precision of the operation, but also ensures that the cable maintains consistent positioning throughout the molding process, ultimately ensuring the stability and consistency of the coating quality.

[0070] like Figure 2 and Figure 5As shown, there are two positioning wheels 22, and an annular arc groove 221 coaxial with the positioning wheel 22 is provided on the outer circumference thereof. The positioning mechanism 2 also includes a fixed disk 24 and two supports 25. The fixed disk 24 is fixedly arranged at the feed end of the extrusion head mold 1, and the avoidance port 21 is located at the center of the fixed disk 24. The two supports 25 are arranged on the fixed disk 24 to slide toward or away from each other along the radial direction of the avoidance port 21. The two positioning wheels 22 are respectively rotatably arranged on the two supports 25. The supports 25 are provided with guide columns 251 that penetrate the fixed disk 24 and slide with it, driving The moving part includes an adjusting ring 231 which is coaxially rotatably arranged at the other end of the fixed disk 24. The adjusting ring 231 is provided with a guide groove 2311 which deviates from its radial direction. The guide column 251 extends into the guide groove 2311 and slides with it. An adjusting cylinder 232 which is coaxial with it is provided on the outer circumference of the adjusting ring 231. The adjusting cylinder 232 is threadedly connected to the outer circumference of the fixed disk 24. The fixed disk 24 is provided with a connecting column 241 which extends along its axial direction and is connected to the extrusion head mold 1. The adjusting ring 231 is provided with an arc groove 2312 which slides with the connecting column 241.

[0071] The outer circumference of the positioning wheel 22 is provided with a coaxial annular arcuate groove 221. This design ensures that the cable is effectively guided and positioned as it passes through the positioning wheel 22. The positioning mechanism 2 also includes a fixed disk 24 and two supports 25. The fixed disk 24 is securely mounted on the feed end of the extrusion head mold 1, with the escape opening 21 located directly at the center of the fixed disk 24. The two supports 25 are arranged on the fixed disk 24 so as to slide toward or away from each other along the radial direction of the escape opening 21. This arrangement allows the supports 25 to be adjusted between different positions to accommodate cables of different sizes. The two positioning wheels 22 are rotatably mounted on the two supports 25, respectively, ensuring that the cable is evenly supported and guided as it passes through the positioning wheel 22. The supports 25 are provided with guide posts 251 that extend through the fixed disk 24 and slidably engage with it. The function of these guide posts 251 is to enable the supports 25 to slide smoothly on the fixed disk 24 while maintaining accurate positioning. The driving member includes an adjustment ring 231 coaxially rotatably disposed at the other end of the fixed disk 24. The adjustment ring 231 is provided with a guide groove 2311 deviating from its radial direction. A guide post extends into the guide groove 2311 and slides therewith. The guide groove 2311 intersects the sliding direction of the support 25. By rotating the adjustment ring 231, the sliding position of the support 25 can be precisely controlled. An adjustment cylinder 232 is coaxially disposed on the outer circumference of the adjustment ring 231. The adjustment cylinder 232 is connected to the outer circumference of the fixed disk 24 via a threaded connection, which allows for convenient adjustment of the position of the adjustment cylinder 232. The fixed disk 24 is also provided with a connecting post 241 extending along its axial direction and connected to the extrusion head die 1 to ensure a stable connection between the fixed disk 24 and the extrusion head die 1. The adjusting ring 231 is provided with an arcuate groove 2312 that slidably fits with the connecting post 241 . This design enables the adjusting ring 231 to maintain a good fit with the connecting post 241 during the adjustment process, thereby ensuring the stability and accuracy of the entire positioning mechanism 2 .

[0072] A cable core overmolding method, characterized in that the molding method is realized by a cable core overmolding device, and the molding method comprises the following steps:

[0073] Step 1: The cable core is coaxially passed through the coating channel 111 of the extrusion head die 1, and the cable core is pulled to move in the coating channel 111;

[0074] Step 2: Adjust the position of the ring 231-shaped sliding seat 12 in the extrusion head through the adjustment component 13 as needed to adjust the diameter of the ring 231-shaped extrusion port 113.

[0075] Step three: start the extruder and inject the molten material into the annular molten material cavity 112. When the cable core passes through the extrusion head, the annular extrusion port 113 covers the cable core with a fixed thickness of molten material.

[0076] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A cable core overmolding device, comprising an extrusion head die and an extruder for injecting high-pressure melt into the extrusion head die, characterized in that: The extrusion head mold has a coating channel for the cable to pass through, an annular melt cavity surrounding the coating channel, and an annular extrusion port connecting the annular melt cavity and the coating channel. When the cable passes through the coating channel, the annular extrusion port coats the outer periphery of the cable with a melt having a thickness equal to the opening width of the annular extrusion port. The extrusion head mold is provided with a feed port extending along its radial direction, the feed port is connected with the annular melt cavity, the injection port of the extruder is connected with the feed port, the extrusion head mold is provided with an annular sliding seat coaxial with the coating channel, and an adjustment component for driving the annular sliding seat to move along its axial direction, the annular sliding seat is hollow and coaxially connected with the coating channel, an annular melt cavity and an annular extrusion port are formed between the annular sliding seat and the inner end of the extrusion head mold, the diameter of the annular extrusion port expands as the distance between the annular sliding seat and the inner end of the extrusion head mold increases, and the thickness of the cable insulation layer is controlled by adjusting the diameter of the annular extrusion port; The cable core wrapping molding device also includes an air pump, an annular air cavity is also provided in the extrusion head mold, and an air flow guiding rotating member is coaxially arranged in the wrapping channel. The extrusion head mold is also provided with an air inlet connected to the annular air cavity, and the air inlet is connected to the air outlet of the air pump. The annular air cavity is located on the side of the annular melt cavity discharge, and the air flow guiding rotating member is located on the side of the annular extrusion port discharge. The air flow guiding rotating member is hollow and connected to the wrapping channel. The air flow guiding rotating member is provided with an air outlet groove connecting its inner cavity and the annular air cavity. The air pump pumps gas into the annular air cavity. When the gas passes through the air outlet groove from the annular air cavity into the wrapping channel, the air flow guiding rotating member rotates in the wrapping channel.

2. A cable core overmolding device according to claim 1, characterized in that: The annular sliding seat is coaxially threadedly screwed to the inner wall of the extrusion head mold. When the annular sliding seat rotates relative to the extrusion head mold, the annular sliding seat moves along the axial direction of the coating channel in the extrusion head mold. One end of the adjusting component is connected to the outer end of the annular sliding seat, and the other end of the adjusting component extends to the outside of the extrusion head mold along the axial direction of the coating channel. By rotating the adjusting component relative to the exposed part of the extrusion head, the annular sliding seat is guided to move along the axial direction of the coating channel in the extrusion head mold.

3. A cable core overmolding device according to claim 2, characterized in that: The outer end of the annular sliding seat is provided with an inner gear cylinder coaxial therewith, and the inner gear cylinder is threadedly connected to the inner wall of the extrusion head mold. The adjusting assembly includes a fixing ring, a driving cylinder, an outer gear ring and a gear. The fixing ring is coaxially fixedly arranged at one end of the extrusion head mold, and the driving cylinder is coaxially rotatably arranged in the inner mouth of the fixing ring. One end of the driving cylinder extends into the covering channel, and the other end of the driving cylinder extends to the outside of the fixing ring. The outer gear ring is coaxially fixedly arranged at the inner end of the driving cylinder, and the gear is rotatably arranged along the circumference of the driving cylinder. The gear is located between the outer side of the outer gear ring and the inner side of the inner gear cylinder, and the gears are respectively engaged with the outer gear ring and the inner gear cylinder.

4. A cable core overmolding device according to claim 3, characterized in that: The outer end of the driving cylinder is provided with a driving ring coaxial therewith, and the outer circumferential surface of the driving ring is provided with a driving handle extending along its radial direction, and the end of the driving handle extends to the outside of the extrusion head mold.

5. A cable core overmolding device according to claim 4, characterized in that: The sheathing channel is also provided with a cylindrical mounting groove coaxial therewith, and the airflow guiding rotating member includes a rotating cylinder coaxially rotatably arranged in the cylindrical mounting groove, an air passage is formed between the outer circumferential surface of the rotating cylinder and the inner wall of the cylindrical mounting groove, and the outer circumferential surface of the rotating cylinder is provided with arc-shaped guide vanes distributed along its circumference, and the air outlet grooves are distributed circumferentially on the outer circumferential surface of the rotating cylinder, and the outer edges of the arc-shaped guide vanes are gap-matched with the inner wall of the cylindrical mounting groove, and an annular air outlet connected to the air passage is provided on the inner side of the annular air cavity, and the air outlet groove is located on the side where the arc-shaped guide vanes deviate from the annular air outlet. When the gas in the annular air cavity passes through the annular air outlet, the air passage and the air outlet groove in sequence, the rotating cylinder rotates under the action of the airflow of the arc-shaped guide vanes.

6. A cable core overmolding device according to claim 5, characterized in that: The extrusion head mold includes a base body and an end body connected to the base body. The melt cavity is located in the base body, and an annular air cavity is formed between the base body and the end body. An annular connecting groove 1 is provided at one end of the base body, and an annular connecting groove 2 is provided at one end of the inner circumferential surface of the end body. The two ends of the rotating cylinder are coaxially connected to the annular connecting groove 1 and the annular connecting groove 2 respectively.

7. A cable core overmolding device according to any one of claims 1 to 6, characterized in that: The cable core overmolding device also includes a positioning mechanism arranged at the feed end of the extrusion head mold, the positioning mechanism having an avoidance opening for the cable to pass through, positioning wheels that can be arranged circumferentially along the avoidance opening, and a driving member for driving all positioning wheels to move synchronously along the radial direction of the avoidance opening.

8. A cable core overmolding device according to claim 7, characterized in that: There are two positioning wheels, and an annular arc groove coaxial with the positioning wheel is provided on the outer circumference of the positioning wheel. The positioning mechanism also includes a fixed plate and two supports. The fixed plate is fixedly arranged at the feed end of the extrusion head mold, and the avoidance port is located at the center position of the fixed plate. The two supports are arranged on the fixed plate to slide toward or away from each other along the radial direction of the avoidance port. The two positioning wheels are rotatably arranged on the two supports respectively, and a guide column is provided on the support that passes through the fixed plate and slides with it. The driving member includes an adjusting ring coaxially rotatably arranged at the other end of the fixed plate, the adjusting ring is provided with a guide groove deviating from its radial direction, the guide column extends into the guide groove and slides with it, and an adjusting cylinder coaxial with it is provided on the outer circumference of the adjusting ring. The adjusting cylinder is threadedly connected to the outer circumference of the fixed plate, and the fixed plate is provided with a connecting column extending along its axial direction and connected to the extrusion head mold, and the adjusting ring is provided with an arc groove that slides with the connecting column.

9. A cable core overmolding method, characterized in that: A cable core overmolding method is implemented by a cable core overmolding device according to any one of claims 1 to 6 and 8, the cable core overmolding method comprising the following steps: Step 1: The cable core is coaxially passed through the coating channel of the extrusion head die, and the cable core is pulled to move in the coating channel; Step 2: Adjust the position of the annular sliding seat in the extrusion head through the adjustment component as needed to adjust the diameter of the annular extrusion port. Step three: start the extruder and inject the molten material into the annular molten material cavity. When the cable core passes through the extrusion head, the annular extrusion port covers the cable core with a fixed thickness of molten material.

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