Temperature loss prevention extrusion die core
By creating insulating grooves inside the mold core and using a protective sleeve, the problem of insulation or sleeve misalignment caused by mold core temperature loss was solved, achieving uniform coating and efficient production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-04-07
AI Technical Summary
In the production process of existing anti-heat loss extrusion dies, the contact between the conductor or cable core and the die core leads to rapid heat conduction, causing the die core to lose temperature. This affects the uniform extrusion of the molten polymer, resulting in quality problems such as insulation or sheath eccentricity and holes. Furthermore, traditional improvement methods are costly and inefficient.
Insulating grooves are opened inside the mold core, combined with protective sleeves and thickened sleeves, to reduce heat conduction, maintain stable mold core temperature, and ensure uniform extrusion of molten polymer.
This effectively prevents core cooling, ensures uniform coating of molten polymer, improves product quality and production efficiency, and reduces production costs.
Smart Images
Figure CN224089631U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of mould core, specifically to prevent losing temperature extrusion mould core. BACKGROUND
[0002] The insulation and sheath of cable are usually plastic polymer, when producing, plastic extruder and mould are used, melt state plastic polymer is extruded and packed to conductor or cable core, through water cooling and other ways, melt state plastic is solidified to conductor or cable core, forming the insulation or sheath of cable. However, conductor is metal material, and cable core often has metal material such as armor, due to the extrusion process, conductor or cable core pay-off, extruder mould, take-up position is approximately horizontal linear arrangement, extrusion mould is in the middle position, although there is certain tension between pay-off and take-up, due to the action of gravity, conductor or cable core is slightly sagging in the mould position, so that conductor or cable core will contact with the lower edge of the pipe wall of mould core, and conductor is generally copper, aluminum, and armor layer on cable core is usually steel belt, the thermal conductivity of copper, aluminum and steel is about 401, 237 and 50 W / m·k respectively, the thermal conductivity is large, the pipe wall part of mould core is relatively thin, and the heat capacity is small, so the pipe wall part temperature is quickly taken away by the touch of metal material at normal temperature, especially for large specification cable, the temperature loss of mould core is more serious in winter production, so that the end part of mould core pipe wall is not much higher than the ambient temperature, so that melt state polymer is rapidly cooled in the extrusion flow channel, and local solidification is blocked, so it cannot be uniformly extruded and packed to conductor or cable core, causing the eccentricity of insulation or sheath, and when serious, forming the phenomena such as hole and disconnection.
[0003] In order to prevent the occurrence of this phenomenon, the traditional method is: first, a greater tension is applied between pay-off and traction, so that conductor or cable core is in straight line as much as possible, reducing the sag of conductor or cable core in the mould part, thereby reducing the frequency of contact between conductor or cable core and mould, preventing temperature loss; second, the mould is changed to large specification, for example, the normal mould core aperture is usually 1mm to 3mm larger than the outer diameter of conductor, and 3mm to 5mm larger than the outer diameter of cable core, after changing to large specification, it is 3mm to 5mm larger than the maximum diameter of conductor, and 5mm to 8mm larger than cable core, and the mould sleeve is also enlarged accordingly. Again, the head is inclined downward, so that conductor or cable core and mould pipe wall root are in point contact, and due to the small contact area, the temperature loss is also small.
[0004] The existing method has the following disadvantages: first, in order to increase the tension, a high-power traction machine needs to be additionally arranged, which wastes space and energy and increases the production cost; even so, the conductor or cable core still frequently touches the mold core in winter production of large-size cables, and the temperature loss phenomenon often occurs; second, after the mold size is increased, the eccentricity is serious; the machine head is inclined downward, which is not only not beautiful, but also varies from person to person, and it is not easy to master the size and angle of the cable, even if the cable is inclined to the so-called optimal angle, so that the molten polymer can be uniformly extruded from the mold, since the extruded polymer also inclines with the mold, the extruded polymer also inclines when being extruded onto the conductor or cable core, which is easy to cause the eccentricity of the extruded product. Thus, the product quality cannot be fundamentally guaranteed, the manufacturing cost is high, and the production efficiency is low, and therefore, the present application provides a temperature loss prevention extrusion mold core. Content of the utility model
[0005] In view of the defects of the existing temperature loss prevention extrusion mold core, the temperature loss prevention extrusion mold core has the advantages that a temperature insulation circular groove is arranged in the mold core, heat conduction is reduced, and the temperature loss of the extruded product is avoided.
[0006] The utility model provides the following technical scheme: a temperature loss prevention extrusion mold core, including a mold cover, the inner side of the mold cover is movably connected with a mold core, a conductor is arranged in the mold core, the mold cover and the mold core can extrude a coating material to coat the conductor, a temperature insulation circular groove is arranged in the mold core, and a protective sleeve is arranged on the outer side of the mold cover.
[0007] Preferably, the protective sleeve comprises a protective sleeve, the front end of the protective sleeve is movably connected with the conductor, a first thickening sleeve and a second thickening sleeve are sequentially arranged on the inner side of the protective sleeve, and the second thickening sleeve is arranged in the first thickening sleeve.
[0008] Preferably, one end of the conductor is provided with a traction device, and the conductor is arranged in the middle part of the mold core.
[0009] Preferably, the thickness of the inner wall of the mold core is 2mm to 3mm, the thickness of the temperature insulation circular groove is 0.5mm, and the depth of the temperature insulation circular groove is 1mm longer than the length of the wall of the mold core.
[0010] Preferably, the coating material is arranged on the outer side of the conductor, and the material of the coating material is a polymer material.
[0011] Preferably, the mold cover and the mold core are arranged on an extruder, and the other end of the conductor extends into a water cooling device.
[0012] Compared with the existing temperature loss prevention extrusion mold core, the temperature loss prevention extrusion mold core has the following advantages:
[0013] 1. The anti-temperature-loss extrusion die core, by setting the temperature insulation circular groove in the inside of the die core, when the conductor is dragged to move and the conductor contacts the die core, the heat conduction in the process of forming the extrusion hole between the die sleeve and the die core is not caused, the outside of the die core pipe wall still keeps the best temperature of the polymer melt extrusion, when the molten polymer flows to the pipe wall, the flow channel is not affected by the temperature drop to keep smooth, and the conductor or cable core can be uniformly extruded and wrapped, the insulation or sheath of the cable is formed after cooling and solidification, and eccentricity, holes, disconnection and other phenomena are not caused, and the quality of the product is ensured.
[0014] 2. The anti-temperature-loss extrusion die core, the protective sleeve is installed on the outside of the die sleeve, according to different diameters of the conductor, the first thickening sleeve or the second thickening sleeve can be installed in the inside of the protective sleeve, when the cladding is wrapped outside the conductor, the interference is not caused, and meanwhile, the stable state between the conductor and the cladding is ensured when the cladding is wrapped, and the temperature loss phenomenon is not caused, and the product quality is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a protective sleeve structure schematic view of the utility model;
[0016] Figure 2 It is a protective sleeve sectional structure schematic view of the utility model;
[0017] Figure 3 It is a protective sleeve structure schematic view of the utility model;
[0018] Figure 4 It is a protective sleeve sectional structure schematic view of the utility model;
[0019] Figure 5 It is a structure schematic view of the utility model A place amplification.
[0020] In the drawing: 1, die sleeve; 2, die core; 3, conductor; 4, cladding; 5, temperature insulation circular groove; 6, protective sleeve; 61, protective sleeve; 62, first thickening sleeve; 63, second thickening sleeve. DETAILED DESCRIPTION
[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the range of the utility model protection.
[0022] Please refer to Figure 1 、 Figure 2 、 Figure 3 ,Figure 4 and Figure 5 The utility model provides an anti-lost temperature extrusion mould core, including the mould cover 1, the inside movable sleeve joint of mould cover 1 has mould core 2, extrusion hole between mould cover 1 and mould core 2, drive the covering 4 to provide the activity space, the inside of mould core 2 is installed with the conductor 3 through, the inside of mould cover 1 and mould core 2 can extrude the covering 4 of the conductor 3 outside and is wrapped, the covering 4 is extruded through extrusion hole after being melted by extruder, and the covering 4 is covered outside the conductor 3 simultaneously extruded, the inside of mould core 2 is provided with the temperature insulation round groove 5, and the temperature insulation round groove 5 is clamped in the inside of mould core 2, when the covering 4 is extruded, the temperature of the covering 4 will not be lost due to the heat conduction of the pipe wall of mould core 2, improves the stability when the mould core 2 is covered, the outside of mould cover 1 is screw-jointed with the protective sleeve 6, and the protective sleeve 6 is protected when the covering 4 is covered, avoids the outside air transmission to the covering forming area of the covering 4, leads to the cooling of too fast, thereby influence its forming efficiency.
[0023] Please refer to Figure 5 The protective sleeve 6 includes the protective sleeve 61, the front end movable sleeve joint of protective sleeve 61 is outside the conductor 3, the inside of protective sleeve 61 is screw-jointed with first thickening sleeve 62 and second thickening sleeve 63 in proper order, wherein the second thickening sleeve 63 is jointed in the inside of first thickening sleeve 62, by the sleeve joint of protective sleeve 6 in the outside of mould cover 1, namely the covering of the covering 4 in the conductor 3, the protective sleeve 6 is protected outside the covering area, avoids the outside gas circulation when the covering 4 is extruded and covered outside the conductor 3, leads to the solidification of the extruded covering 4 when cold, thereby influence its covering effect, improve its forming efficiency, and according to the thickness of the conductor 3 and the covering 4, by the dismounting or replacement of the first thickening sleeve 62 and the second thickening sleeve 63 of different sizes, improve the convenience when the hole size adjustment of the inside of protective sleeve 6 is formed.
[0024] Please refer to Figure 4 One end of the conductor 3 is provided with a traction device, and the conductor 3 is sleeved on the central part of the mold core 2. The front end of the conductor 3 is provided with a traction device, which can drive the conductor 3 to move at a constant speed. After the covering 4 is extruded and attached to the outside of the conductor 3, the covering 4 is deformed and wrapped around the outside of the conductor 3, improving the convenience of the conductor 3 during traction.
[0025] Please refer to Figure 4The thickness of the inner tube wall of the mold core 2 is 2-3 mm, the thickness of the temperature insulation circular groove 5 is 0.5 mm, and the depth of the temperature insulation circular groove 5 is 1 mm longer than the length of the tube wall of the mold core 2. By opening the temperature insulation circular groove 5 inside the mold core 2, the conductor 3 is pulled out from the inside of the mold core 2, and the covering 4 is extruded and attached to the outside of the conductor 3. At the same time, due to the temperature insulation circular groove 5, the conductor 3 can avoid pulling the mold core 2 to cool down, causing the extruded covering 4 to drop steadily, ensuring that the temperature insulation circular groove 5 is extruded at the best temperature. When the molten polymer flows to the tube wall, it does not affect the smooth flow of the flow channel due to cooling, and can uniformly extrude and cover the conductor 3, and after cooling and solidification, form the insulation or sheath of the cable, without causing the insulation or sheath to be eccentric, or forming holes, disconnections, and other phenomena, ensuring the quality of the product.
[0026] Please refer to Figure 3 The covering 4 is installed on the outside of the conductor 3, and the material of the covering 4 is a polymer material. By using an extruder, the covering 4 is heated and melted, and the heated and melted covering 4 can be installed on the outside of the conductor 3, improving the convenience of installing the covering 4.
[0027] Please refer to Figure 3 The mold sleeve 1 and the mold core 2 are installed on the extruder, and the other end of the conductor 3 extends into the inside of the water cooling device. By installing the mold sleeve 1 and the mold core 2 on the extruder, the position of the mold sleeve 1 and the mold core 2 can be limited, and an extrusion hole is formed between the mold sleeve 1 and the mold core 2. The covering 4 is heated by the extruder to form a molten state, and the molten covering 4 is extruded from the inside of the hole, and is qualified to be covered on the outside of the conductor 3 by the mold sleeve 1 and the mold core 2. After the covering is contacted and pulled into the water cooling device, the equipment covering 4 can be cooled and shaped.
[0028] Working principle: when using, the die sleeve 1 and the die core 2 are installed on the extruder, and the conductor 3 penetrates the inside of the die core 2, the end of the conductor 3 is driven to move at a constant speed by using the traction device, due to the approximate horizontal straight arrangement of the conductor 3 during the extrusion process, the extruder die, the take-up position, the die core 2 in the middle position, although there is a certain tension between the pay-off and the take-up, due to the action of gravity, the conductor 3 is slightly sagging at the die position, so that the conductor 3 will contact the lower edge of the pipe wall of the die core 2, since the conductor is usually copper, aluminum, and the armor layer is generally steel belt material, the thermal conductivity of copper, aluminum and steel is 401, 237 and 50 W / m·k respectively, and the thermal conductivity is large, and the die core 2 is usually ordinary steel or alloy steel, and the thermal conductivity thereof is about 50 W / m·k, the pipe wall part of the die core 2 of the present application is different from the ordinary die core 2, and the temperature-insulating circular groove 5 is arranged at the pipe wall part of the die core 2. The die arrangement can be carried out according to the normal die arrangement. When the normal temperature conductor 3 metal material touches the die core 2 pipe wall lower edge of the present application, the temperature of the die core 2 pipe wall in the inner circle of the temperature-insulating circular groove decreases, since the hollow temperature-insulating circular groove is empty, and the thermal conductivity of air is about 0.023 W / m·k, which almost isolates the temperature drop of the die core 2 pipe wall from inside to outside, like a vacuum insulated cup filled with hot water, the vacuum part isolates the temperature of the outside and the inside, in this way, the outside of the die core 2 pipe wall still maintains the best temperature of the polymer melt extrusion, and when the molten polymer flows to the pipe wall, it does not affect the smoothness of the flow channel due to the temperature drop, and can uniformly extrude on the conductor 3, and after cooling and solidification, the cable insulation or sheath is formed, which will not cause the eccentricity of the insulation or sheath, or form the phenomenon of broken hole, disconnection and the like, and the quality of the product is ensured.
[0029] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A heat loss prevention extrusion die core, comprising a die sleeve (1), wherein a die core (2) is movably sleeved on the inner side of the die sleeve (1), and a conductor (3) is installed through the interior of the die core (2), characterized in that: The mold sleeve (1) and the mold core (2) can be extruded to form a covering material (4) to wrap the conductor (3) inside. The mold core (2) has a heat-insulating circular groove (5) inside. The mold sleeve (1) is threaded with a protective sleeve (6).
2. The anti-heat loss extrusion die core according to claim 1, characterized in that: The protective sleeve (6) includes a protective sleeve (61), the front end of which is movably sleeved on the outside of the conductor (3), and the inner side of the protective sleeve (61) is sequentially threaded with a first thickened sleeve (62) and a second thickened sleeve (63), wherein the second thickened sleeve (63) is sleeved inside the first thickened sleeve (62).
3. The anti-heat loss extrusion die core according to claim 1, characterized in that: One end of the conductor (3) is equipped with a traction device, and the conductor (3) is sleeved on the center of the mold core (2).
4. The anti-heat loss extrusion die core according to claim 1, characterized in that: The inner wall thickness of the mold core (2) is 2mm to 3mm, the thickness of the heat insulation groove (5) is 0.5mm, and the depth of the heat insulation groove (5) is 1mm longer than the length of the mold core (2) wall.
5. The anti-heat loss extrusion die core according to claim 1, characterized in that: The covering (4) is installed on the outside of the conductor (3).
6. The anti-heat loss extrusion die core according to claim 1, characterized in that: The die sleeve (1) and die core (2) are mounted on the extruder, while the other end of the conductor (3) extends into the interior of the water cooling device.