High temperature flat dual core octopus cable extrusion die

Abstract

The utility model discloses a high temperature flat double -core lotus -root -shaped cable extrusion mould, including outer die core and the inner die core of setting in the inside of outer die core, the outer die core is opened with axial slot, the inner die core is matched with axial slot and is connected, the interval airflow cavity between the inner die core front end and the wall surface of axial slot, the inner die core rear end is opened with airflow groove and airflow cavity intercommunication, the inner die core center is opened with the inner core wire hole, the outer die core front end is provided with the outer core wire hole, the outer die core front end annular arrangement has a plurality of air inlet holes, air inlet hole communicates airflow cavity. The utility model discloses adopts the design of split, because the length of air inlet hole obtains the substantial reduction, the processing difficulty is low, and the straightness of air inlet hole is well guaranteed, and the precision is high, has solved the existing mould for the cable of small size to the fine air inlet hole having the exacting requirement to the fine air inlet hole, and the precision cannot be guaranteed the problem of difficult processing, makes great contribution for the development of promoting the miniaturization, high precision cable.

Description

Technical Field

[0001] This utility model relates to the field of cable injection molding head technology, and in particular to a high-temperature flat double-core lotus root cable extrusion mold. Background Technology

[0002] With the rapid growth in market demand for fluoroplastic cables, such as aerospace cables, nuclear power cables, and high-voltage wire harness processing: extrusion of insulation layers for high-voltage cables inside electric vehicle battery packs (temperature resistance needs to reach above 150°C). The demand for extrusion molds used for high-temperature resistant insulation materials such as polytetrafluoroethylene (PTFE), FEP, PFA and other fluoroplastics and polyetheretherketone (PEEK) has surged.

[0003] Conventional dual-core high-speed cables consist of two core wires wrapped into an elliptical cross-section. The extrusion molds used to produce these cables are typically flat-mouthed dies with flat-ended cores. This type of cable market is becoming increasingly saturated. With the continuous development and iteration of high-speed cables, there is a growing demand for more scientifically designed cables with cross-sections featuring annular or perforated designs that ensure more stable transmission. Existing core structures can no longer meet these requirements.

[0004] The molds required for high-speed production lines with annular lotus root-shaped hollowed-out cross-sections and annular small hole hollowed-out structures are as follows: Figure 2 As shown, by opening a core wire hole 200 along the length of the mold core 100 at its center, and setting multiple air inlets 300 along the length of the core wire hole 200, this structure can meet the extrusion requirements of general products. However, for small-sized cables, there are strict dimensional requirements for the diameter of the air inlets. For long strip mold cores with metal structures, it is almost impossible to process air inlets with a fine diameter that are through the front and back along the length of the mold core. Moreover, the straightness of the air inlets cannot be guaranteed. Therefore, for high-speed lines with small apertures and strict dimensional requirements, the existing molds can no longer meet their production and precision requirements. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-temperature flat double-core lotus root cable extrusion mold.

[0006] To achieve the above objectives, a high-temperature flat dual-core lotus root cable extrusion die includes an outer die core and an inner die core sleeved inside the outer die core. The outer die core has an axial groove with a tapered end along its axis. The inner die core is fitted into the axial groove. The front end of the inner die core is tapered, and an airflow cavity for accommodating airflow is spaced between the front end of the inner die core and the wall of the axial groove. An airflow groove communicating with the airflow cavity is provided at the rear end of the inner die core. At least two inner core wire holes are provided at the center of the inner die core along its length for the core wire to pass through. The front end of the outer die core is provided with outer core wire holes corresponding to the inner core wire holes, allowing the core wire to pass through the inner die core and the outer die core. Multiple air inlets are arranged in a ring around the outer core wire holes at the front end of the outer die core, and the air inlets communicate with the airflow cavity. An air extraction groove communicating with the inner core wire holes is provided at the center of the rear end of the inner die core.

[0007] The inner and outer mold cores are connected by a sleeve and can be processed separately. The diameters of the inner and outer core wire holes are relatively large, so there are no processing difficulties. Due to the opening of the axial groove, the air inlet hole of the outer mold core only needs to be connected to the airflow cavity, which shortens the processing length of the air inlet hole and greatly reduces the processing difficulty. The airflow groove of the inner mold core has no strict size requirements. The airflow groove only needs to be connected to the airflow cavity, so there are no processing difficulties. After the inner and outer mold cores are matched and installed, the dual core wires can pass through the inner and outer core wire holes. The airflow is injected through the airflow groove, passes through the airflow cavity, and is discharged from the air inlet hole. Each air inlet hole drives the injection molten material to form a corresponding air hole, thereby driving the whole to form a hollow structure. This makes the cable injection molding form a high-speed wire with a cross-section of ring-shaped hollow and ring-shaped small hole hollow. In order to ensure that the injection molten material is tightly bonded, the inner mold core is also equipped with an air extraction groove connected to the core wire hole. By extracting air, a negative pressure is formed to drive the injection molten material to tightly bond with the core wire to complete the injection molding.

[0008] Preferably, the outer periphery of the inner mold core is in close contact with the wall of the axial groove, and the airflow groove is opened on the outer periphery of the inner mold core and is arranged along its length to communicate with the airflow cavity.

[0009] The close fit between the outer periphery of the inner mold core and the wall of the axial groove ensures the airtightness of the connection. At the same time, the airflow groove is opened to guide the airflow into the airflow cavity to realize the blowing operation. Moreover, the airflow groove is opened on the outer periphery of the inner mold core, which simplifies the processing.

[0010] Preferably, the outer periphery of the inner mold core includes a front bonding section and a rear bonding section along its front-back direction, and an annular buffer groove is provided between the front bonding section and the rear bonding section.

[0011] The buffer groove is designed to separate the outer periphery of the inner mold core into a front bonding section and a rear bonding section. The function of the buffer groove is to buffer the airflow during blowing, avoid excessive air pressure, and help control the pressure stability in the airflow cavity to ensure uniform air output from each air inlet.

[0012] Preferably, the airflow channels corresponding to the front bonding section and the rear bonding section are staggered.

[0013] A staggered arrangement can improve the airflow buffering effect of the buffer trough.

[0014] Preferably, the airflow channels are provided in multiple forms in a circular array.

[0015] Since there are multiple air inlets, multiple airflow channels are set up to allow air to enter simultaneously in order to ensure the uniformity of air output from the air inlets.

[0016] Preferably, the outer mold core is provided with a locking screw perpendicular to the axis, and the locking screw abuts against the inner mold core.

[0017] Locking screws are provided to further secure the inner mold core and enhance the stability of the connection.

[0018] Preferably, a mold head is also sleeved on the front part of the outer mold core, and an injection cavity is spaced between the outer mold core and the mold head. The mold head is provided with a discharge hole that communicates with the injection cavity.

[0019] Molten plastic comes into contact with and encapsulates the core wire in the injection cavity, and is then extruded through the outlet hole to form a cable. During this process, air is constantly being released from the air inlet. Each air inlet pushes the molten plastic out of the hole, thus forming a high-speed cable with a cross-section that is annular, lotus root-shaped, and has small annular holes.

[0020] Preferably, the front end of the outer mold core has multiple exhaust pipes arranged in a ring around the outer core wire hole, the air inlet is the pipe channel of the exhaust pipe, and the exhaust pipe extends into the discharge hole.

[0021] Setting the exhaust pipe to extend into the discharge hole can better maintain the regularity of the shape of the air holes on the high-speed line after molding and avoid excessive deformation of the air holes.

[0022] Preferably, the front end of the inner mold core is provided with an inwardly recessed mating groove, and the axial groove is provided with a mating protrusion that matches the mating groove.

[0023] The mating groove and mating protrusion are designed to match, which facilitates proper installation and ensures stability when the inner mold core and outer mold core are fitted together.

[0024] Preferably, the docking groove is elongated, and the inner core wire holes are evenly arranged within the docking groove area.

[0025] The elongated docking groove ensures the precise positioning of the inner mold core and the uniqueness of the arrangement between the inner core wire holes and the air inlet holes.

[0026] Compared with the prior art, the beneficial effects of this utility model are: This utility model's inner and outer mold cores are connected by a sleeve and can be processed separately. The inner and outer core wire holes have large diameters, eliminating processing difficulties. Due to the axial groove, the outer mold core only needs to connect to the airflow cavity to process the air inlet hole, shortening the processing length of the air inlet hole and greatly reducing processing difficulty. The airflow groove on the inner mold core has no strict size requirements; it only needs to connect to the airflow cavity, eliminating processing difficulties. After the inner and outer mold cores are matched and installed, the dual-core wires can pass through the inner and outer core wire holes. Airflow is injected through the airflow groove, passes through the airflow cavity, and exits from the air inlet hole. Each air inlet hole drives the injection molten material to form corresponding air holes, thereby driving the whole to form a hollow structure. This results in a high-speed wire with a cross-section of annular lotus root-shaped hollow and annular small hole hollow. To ensure tight bonding during injection molding, the inner mold core is also equipped with an air extraction groove connected to the core wire hole. By extracting air, a negative pressure is formed to drive the injection molten material to tightly bond with the core wire to complete the injection molding.

[0027] This utility model adopts a split design. Due to the significant reduction in the length of the air inlet, the processing difficulty is low, the straightness of the air inlet is well guaranteed, and the precision is high. It solves the problem that existing molds are difficult to process and cannot guarantee the precision of small air inlets for cables with demanding requirements for small size. It makes a great contribution to promoting the development of micro-fine and high-precision cables. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the embodiments will be briefly introduced below.

[0029] Figure 1 This is a schematic diagram of the structure of this utility model.

[0030] Figure 2 This is a partial structural schematic diagram of the present invention.

[0031] Figure 3 This is a cross-sectional view of the structure of this utility model.

[0032] Figure 4 This is a partial structural schematic diagram of the present invention.

[0033] Figure 5 This is a partial structural schematic diagram of the present invention.

[0034] Figure 6 This is a partial structural schematic diagram of the present invention.

[0035] Figure 7 This is a partial structural cross-sectional view of the present invention.

[0036] Figure 8 This is a schematic diagram of the inner mold core structure of this utility model.

[0037] Figure 9 This is a schematic diagram of the inner mold core structure of this utility model.

[0038] Figure 10 This is a schematic diagram of the outer mold core structure of this utility model. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0040] This utility model provides a high-temperature flat dual-core lotus root cable extrusion die, such as... Figures 1-10 As shown, the device includes an outer mold core 1 and an inner mold core 2 fitted inside the outer mold core 1. The outer mold core 1 has an axial groove 11 with a tapered end along its axis. The inner mold core 2 is fitted into the axial groove 11, and the outer periphery of the inner mold core 2 is in close contact with the wall of the axial groove 11. The front end of the inner mold core 2 is tapered, and an airflow cavity 3 for accommodating airflow is spaced between the front end of the inner mold core 2 and the wall of the axial groove 11. An airflow groove 21 is formed at the rear end of the inner mold core 2. The airflow groove 21 is formed on the outer periphery of the inner mold core 2 and is arranged along its length to communicate with the airflow cavity 3. At least two inner core wire holes 22 are formed at the center of the inner mold core 2 along its length for the core wire to pass through. The front end of the outer mold core 1 is provided with outer core wire holes 12 corresponding to the inner core wire holes 22. The core wire can pass through the inner mold core 2 and the outer mold core 1. During injection molding, the dual core wires can pass through the inner core wire hole 22 and the outer core wire hole 12. The front end of the outer mold core 1 has multiple air inlets 13 arranged in a ring around the outer core wire hole 12. The air inlets 13 are connected to the airflow chamber 3. The airflow is injected through the airflow groove 21 and then discharged through the airflow chamber 3 and the air inlet 13. Each air inlet 13 drives the injection molten material to form a corresponding air hole, thereby driving the whole to form a hollow structure. This makes the cable injection molding form a high-speed line with a cross-section of ring-shaped hollow and ring-shaped small hole hollow. In order to ensure that the injection molten material is tightly attached, the rear end center of the inner mold core 2 is provided with an air extraction groove 23 that connects to the inner core wire hole 22. By extracting air, a negative pressure is formed to drive the injection molten material to tightly attach to the core wire to complete the injection molding. In this design, the inner mold core 2 and the outer mold core 1 are connected by a sleeve and can be processed separately. The inner core wire hole 22 and the outer core wire hole 12 have large diameters and there are no processing difficulties. Due to the opening of the axial groove 11, the outer mold core 1 only needs to connect the air inlet hole 13 to the air flow cavity 3, which shortens the processing length of the air inlet hole 13 and greatly reduces the processing difficulty. The inner mold core 2 has no strict size requirements for the opening of the air flow groove 21. The air flow groove 21 only needs to connect to the air flow cavity 3 and there are no processing difficulties.

[0041] Considering that the pressure of the airflow directly delivered to the airflow cavity 3 by the airflow channel 21 is difficult to control, when the air pressure is too high or too low, it is easy to increase the irregularity of the air outlet of the air inlet 13, affecting the overall quality of the high-speed line. The outer periphery of the inner mold core 2 includes a front bonding section 24 and a rear bonding section 25 along its front-back direction. An annular buffer groove 26 is also provided between the front bonding section 24 and the rear bonding section 25. The buffer groove 26 separates the outer periphery of the inner mold core 2 into the front bonding section 24 and the rear bonding section 25. The buffer groove 26 can buffer the airflow input by the airflow channel 21, which is conducive to controlling the pressure in the airflow cavity 3, making the air outlet of the air inlet 13 more uniform and stable, and ensuring the product processing accuracy.

[0042] To further improve the buffering effect of the buffer groove 26 on the airflow, the airflow grooves 21 corresponding to the front bonding section 24 and the rear bonding section 25 are arranged in a staggered manner.

[0043] Considering that there are multiple air inlets 13 and uniform exhaust is required, multiple airflow slots 21 are provided in a ring array to ensure uniform airflow at each position entering the airflow cavity 3.

[0044] The outer mold core 1 is provided with a locking screw 4 perpendicular to the axis. The locking screw 4 abuts against the inner mold core 2. After the inner mold core 2 is installed, the locking screw 4 further locks the inner mold core 2, thereby improving the structural stability.

[0045] The outer mold core 1 is further fitted with a mold head 5 at its front. An injection cavity 6 is spaced between the outer mold core 1 and the mold head 5. The mold head 5 is provided with an outlet hole 51 that communicates with the injection cavity 6. Molten plastic contacts and wraps around the core wire in the injection cavity 6, and is extruded through the outlet hole 51 to form a cable. During this process, the air inlet 13 continuously emits air, and each air inlet 13 punches the molten plastic in front out of the hole, thereby forming a high-speed cable with a cross-section that is annularly hollowed out and has small annular holes.

[0046] Considering that the airflow will scatter in all directions after passing through the air inlet 13, which is not conducive to the formation of regular air holes, multiple exhaust pipes 7 are arranged in a ring around the outer core hole 12 at the front end of the outer mold core 1. The air inlet 13 is the pipe channel of the exhaust pipes 7. The exhaust pipes 7 extend into the discharge hole 51. The exhaust pipes 7 provide further shaping for the air holes of the high-speed line, thereby improving the regularity of the air hole formation.

[0047] To ensure better docking and installation of the inner mold core 2 and the outer mold core 1, the front end of the inner mold core 2 is provided with an inwardly recessed docking groove 8, and the axial groove 11 is provided with a docking protrusion 9 that matches the docking groove 8. The docking groove 8 and the docking protrusion 9 can cooperate to ensure the installation accuracy of the inner mold core 2.

[0048] The docking groove 8 is elongated, and the inner core wire holes 22 are evenly arranged in the area of ​​the docking groove 8. The elongated docking groove 8 can ensure the accuracy of the installation position of the inner mold core 2 and ensure the uniqueness of the arrangement between the inner core wire holes 22 and the air inlet hole 13.

[0049] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A high-temperature flat dual-core lotus root cable extrusion die, characterized in that, The device includes an outer mold core and an inner mold core fitted inside the outer mold core. The outer mold core has an axial groove with a tapered end along its axis. The inner mold core is fitted into the axial groove. The front end of the inner mold core is tapered, and there is an airflow cavity between the front end of the inner mold core and the wall of the axial groove to accommodate airflow. The rear end of the inner mold core has an airflow groove that communicates with the airflow cavity. The center of the inner mold core has at least two holes along its length for the core wire to pass through. The front end of the outer mold core has external core wire holes that correspond to the internal core wire holes, allowing the core wire to pass through both the inner and outer mold cores. The front end of the outer mold core has multiple air inlets arranged in a ring around the external core wire holes, and the air inlets communicate with the airflow cavity. The rear end of the inner mold core has an air extraction groove that communicates with the internal core wire holes.

2. The high-temperature flat dual-core lotus root cable extrusion die according to claim 1, characterized in that, The outer periphery of the inner mold core is tightly fitted to the wall of the axial groove, and the airflow groove is opened on the outer periphery of the inner mold core and is arranged along its length to communicate with the airflow cavity.

3. The high-temperature flat dual-core lotus root cable extrusion die according to claim 2, characterized in that, The outer periphery of the inner mold core includes a front bonding section and a rear bonding section along its front-back direction, and an annular buffer groove is provided between the front bonding section and the rear bonding section.

4. The high-temperature flat dual-core lotus root cable extrusion die according to claim 3, characterized in that, The airflow channels corresponding to the front and rear bonding sections are staggered.

5. The high-temperature flat dual-core lotus root cable extrusion die according to claim 4, characterized in that, The airflow channels are arranged in a ring array.

6. The high-temperature flat dual-core lotus root cable extrusion die according to claim 1, characterized in that, The outer mold core is provided with a locking screw perpendicular to the axis, and the locking screw abuts against the inner mold core.

7. The high-temperature flat dual-core lotus root cable extrusion die according to claim 1, characterized in that, The outer mold core is further fitted with a mold head at the front, and there is an injection cavity between the outer mold core and the mold head. The mold head is provided with a discharge hole that communicates with the injection cavity.

8. The high-temperature flat dual-core lotus root cable extrusion die according to claim 7, characterized in that, The front end of the outer mold core has multiple exhaust pipes arranged in a ring around the outer core wire hole. The air inlet is the pipe channel of the exhaust pipe, and the exhaust pipe extends into the discharge hole.

9. The high-temperature flat dual-core lotus root cable extrusion die according to claim 1, characterized in that, The inner mold core has an inwardly recessed mating groove at its front end, and the axial groove has a mating protrusion that matches the mating groove.

10. The high-temperature flat dual-core lotus root cable extrusion die according to claim 9, characterized in that, The docking groove is elongated, and the inner core wire holes are evenly arranged within the docking groove area.

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