Reducing extrusion die core
By designing a variable-diameter extrusion die core, the problem of frequent die replacement in cable production was solved, achieving efficient production and ensuring product quality, avoiding the generation of old adhesive, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-04-07
AI Technical Summary
In existing technologies, frequent mold changes are required during cable production, resulting in low production efficiency and the generation of old adhesive, making it difficult to guarantee product quality.
Design a variable diameter extrusion die core, including a die core body, comprising a fixing part and a positioning part. The fixing part is adapted to existing die cores, and the positioning part is used to position the cable conductor or cable core. The structure is simple and easy to manufacture, and it is suitable for the production of cables of different specifications.
This improved cable production efficiency, avoided mold changes and temperature waiting time, reduced the generation of old adhesive, ensured product quality, and lowered production costs.
Smart Images
Figure CN224089632U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cable production technical field, concretely is a kind of variable-diameter extrusion mould core. BACKGROUND
[0002] The insulation and sheath of cable are mostly 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 etc., then it is solidified to conductor or cable core, forms the insulation or sheath of cable.
[0003] In order to make plastic be extruded and packed to conductor or cable core evenly, normal mould core aperture is usually 1-3mm larger than conductor outer diameter, 3-5mm larger than cable core outer diameter, and mould cover is enlarged according to certain stretch ratio.If the aperture of mould core is too large, conductor or cable core will shake in mould core, which is not conducive to eccentric control of insulation or sheath.
[0004] The existing method has the following shortcomings: since cable often has short section demand, a cable specification changes a set of mould, and mould is frequently replaced. Changing mould core and mould cover not only delays time, but also waits for the temperature of mould to be improved, then re-arranges material, adjusts eccentricity, and is wasteful, and if operation time is too long, old glue is generated, for example, in the extrusion process of some polymers (such as PVC), the old glue cannot be discharged from the head no matter how, and the head must be disassembled and cleaned, so that the product quality cannot be fundamentally guaranteed, and the production efficiency of cable is low, so a variable-diameter extrusion mould is needed to change the shortcomings of the existing method. UTILITY MODEL CONTENTS
[0005] The utility model provides a kind of variable-diameter extrusion mould core, solve the fixed aperture of mould core in the background art described above, different moulds need to be replaced for different specifications of cable, it is more inconvenient, reduce work efficiency, prone to old glue, product quality cannot guarantee etc.
[0006] The utility model provides the following technical scheme: a kind of variable-diameter extrusion mould core, including mould core body, the mould core body includes fixed part and positioning part, the fixed part is away from the inner taper surface of the inner taper surface of the inner taper surface of the fixed part of extrusion mould original mould core and adapts, the inner cavity of the positioning part is adapted to cable conductor or cable core, and the outer diameter of the positioning part is less than the pipe diameter of extrusion mould original mould core.
[0007] Preferably, the fixed part is a conical structure, the size of the outer taper surface of the fixed part away from the one end of the positioning part is greater than the size of the other end thereof, and the outer taper surface of the fixed part away from the one end of the positioning part is adapted to the inner taper surface of the extrusion mould original mould core.
[0008] Preferably, the positioning part is a straight pipe, and when the mold core body is clamped with the original mold core cavity of the extrusion die, the central axis of the positioning part, the central axis of the fixing part and the central axis of the original mold core cavity of the extrusion die are in the same straight line.
[0009] Preferably, the positioning part and the fixing part are smoothly connected.
[0010] Preferably, the mold core body is a hollow structure integrally formed.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] 1、The variable-diameter extrusion die is adapted to the mold core of the existing extrusion die, can be directly clamped with the mold core of the existing extrusion die, realizes the positioning of the small-specification cable, avoids disassembling the existing extrusion die, improves the convenience of use of the extrusion die, and can omit the waiting for temperature rising operation, the cable can be directly produced, improves the efficiency of the production of the multi-specification cable, and can avoid the appearance of old glue due to the change of the temperature of the polymer flow channel in the extrusion die, saves the production cost, and guarantees the cable production quality.
[0013] 2、The variable-diameter extrusion die has the advantages of simple structure, easy production, convenient use, easy popularization and practicality. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 A structural schematic view of a variable-diameter extrusion die is provided in the utility model;
[0015] Figure 2 A schematic view of the production of a large-specification cable by the extrusion die in the prior art is provided;
[0016] Figure 3 A schematic view of the application of the variable-diameter extrusion die in the utility model to the existing extrusion die is provided.
[0017] In the drawing: 1, existing mold core; 2, mold sleeve; 3, extruded polymer; 4, conductor or cable core of a large-specification cable; 5, mold core body; 6, fixing part; 7, positioning part; 8, conductor or cable core of a small-specification cable. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0019] The utility model provides an embodiment: please refer toFigure 1 A variable diameter extrusion die core includes a die core body 5, which has a hollow structure. The die core body 5 includes a fixing part 6 and a positioning part 7, which are smoothly transitioned to each other. The die core can be manufactured using an integral molding process.
[0020] The fixing part 6 is used to fix the core body 5 to the original core of the extrusion mold. The fixing part 6 has a conical structure. The size of the end of the fixing part 6 away from the positioning part 7 is larger than the size of the other end. The outer conical surface of the fixing part 6 away from the positioning part 7 is adapted to the inner conical surface of the original core of the extrusion mold. When this application is used, the core body 5 can be engaged with the inner cavity of the original core of the extrusion mold by means of the fixing part 6, thereby fixing the position of the core body 5.
[0021] The positioning part 7 is used to position the cable conductor or cable core. The positioning part 7 is a straight tube. The inner cavity of the positioning part 7 is adapted to the cable conductor or cable core. The outer diameter of the positioning part 7 is smaller than the tube diameter of the original die core of the extrusion mold. When the die core body 5 is engaged with the inner cavity of the original die core of the extrusion mold, the central axis of the positioning part 7, the central axis of the fixing part 6 and the central axis of the original die core of the extrusion mold are on the same straight line. In this way, there will be no vibration when producing small-specification cables.
[0022] The present application will be further described below through an embodiment.
[0023] For the production of multi-specification cables, the larger specification cables are first produced using an extrusion die for larger specification cables, such as... Figure 2 As shown, the basic mold in the prior art includes an existing mold core 1 and a mold sleeve 2. Since the existing mold core 1 and mold sleeve 2 are matched with the size of the conductor or cable core 4 of the large-diameter cable, the conductor or cable core 4 of the large-diameter cable can be properly insulated or sheathed. When the production of the large-diameter cable is completed and a small-diameter cable is replaced, the original extrusion mold does not need to be replaced. The mold core body 5 is simply inserted into the end of the conductor or cable core 8 of the small-diameter cable. Because the outer conical surface of the fixing part 6 matches the inner conical surface of the existing mold core 1, and the outer diameter of the positioning part 7 is smaller than the diameter of the existing mold core 1, and the aperture of the positioning part 7 matches the conductor or cable core 8 of the small-diameter cable, the mold core body 5, after being engaged with the existing mold core 1, can be correctly positioned at the center of the mold core. Thus, the small-diameter cable will not vibrate during production. Figure 3 As shown, since the original mold for large-diameter cables remains unchanged, the polymer flow channel inside the mold maintains its original temperature. Therefore, there is no need to wait for the temperature to rise, and small-diameter cables can be produced directly. Generally, the insulation or sheath of small-diameter cables is slightly thinner than that of large-diameter cables. To produce small-diameter cables of the acceptable thickness, simply increase the draw ratio of the extruded polymer 3 appropriately. This improves production efficiency, saves production costs, and ensures product quality.
[0024] All standard parts used in this utility model can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional means such as bolts that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.
Claims
1. A variable diameter extrusion die core, comprising a die core body (5), characterized in that: The core body (5) includes a fixing part (6) and a positioning part (7). The end of the fixing part (6) away from the positioning part (7) is adapted to the inner conical surface of the original core of the extrusion die. The inner cavity of the positioning part (7) is adapted to the cable conductor or cable core, and the outer diameter of the positioning part (7) is smaller than the tube diameter of the original core of the extrusion die.
2. The variable diameter extrusion die core according to claim 1, characterized in that: The fixing part (6) has a conical structure. The size of the fixing part (6) at the end away from the positioning part (7) is larger than the size of the other end. The outer conical surface of the fixing part (6) at the end away from the positioning part (7) is adapted to the inner conical surface of the original die core of the extrusion mold.
3. The variable diameter extrusion die core according to claim 1, characterized in that: The positioning part (7) is a straight tube. When the core body (5) is engaged with the inner cavity of the original core of the extrusion mold, the central axis of the positioning part (7), the central axis of the fixing part (6) and the central axis of the original core of the extrusion mold are on the same straight line.
4. The variable diameter extrusion die core according to claim 1, characterized in that: The positioning part (7) and the fixing part (6) have a smooth transition.
5. A variable diameter extrusion die core according to claim 1, characterized in that: The core body (5) is a hollow structure formed in one piece.