Self-centering die for cable insulation or sheath extrusion
By designing a self-fixed core mold for cable production, the problems of cumbersome assembly and uneven thickness in the prior art are solved, and the thickness of the glue-covered insulating layer or sheath is uniform, and the quality of cable production is improved.
Patent Information
- Application Number
- CN202421556813.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-03
AI Technical Summary
In the existing cable production, the assembly operation of the extrusion die is cumbersome and the assembly accuracy is low, resulting in uneven thickness of the glue-covered insulation layer or sheath, affecting the quality of cable production.
A custom core mold is designed, including an inner tube die core and an outer shell die sleeve. The inner tube die core and the outer shell die sleeve are connected through an interference fit to ensure uniform gap thickness, the outer diameter of the feed end is greater than the discharge end, and the design of the diversion chamber and the extrusion glue-encapsulating chamber promotes uniform distribution and extrusion of the glue-encapsulating liquid.
Through the design of this self-fixed core mold, the assembly process is simplified, the assembly accuracy is improved, and the thickness of the glue-covered insulation layer or sheath is uniform, thereby improving the production quality of the cable.
Smart Images
Figure CN222927251U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cable production, in particular to a self-aligning die for extruding cable insulation or sheath during cable production. Background Art
[0002] During the process of cable production, it is necessary to coat the surface of the cable core with glue to form an insulating outer layer or a sheath.
[0003] Currently, before implementing the glue coating process, it is necessary to first connect the existing extrusion die to the discharge port of the heating furnace, and the glue coating sleeve in the extrusion die is sleeved on the glue coating core and locked and fixed on the glue coating core through radially arranged locking bolts. When the glue coating process is completed, the glue coating raw material is heated and melted in the heating furnace to form a glue coating liquid, and the glue coating liquid flows into the diversion gap between the glue coating sleeve and the glue coating core in the extrusion die from the discharge port of the heating furnace; during the process that the cable core to be glue-coated passes through the transmission hole on the glue coating core, the glue coating liquid is extruded by the extrusion die to form a uniformly thick insulating layer or sheath coated on the cable core to be glue-coated, forming an insulating outer layer or a sheath. However, since the glue coating sleeve in the extrusion die is locked and fixed on the glue coating core through radially arranged locking bolts, the assembly operation is cumbersome and the assembly accuracy is low, resulting in uneven gaps between the glue coating sleeve and the inner core of the glue coating, and further resulting in uneven thickness of the insulating outer layer formed by the glue coating, affecting the production quality of the cable. Summary of the Utility Model
[0004] In order to improve the production quality of cables, the utility model provides a self-aligning die for extruding cable insulation or sheath. The self-aligning die includes an inner tube core and an outer shell sleeve. The inner tube core includes a connecting section, a diversion and positioning section, and an extrusion section that are connected in a coaxial and collinear manner. The feeding end of the diversion and positioning section is connected to the connecting section, the discharging end of the diversion and positioning section is connected to the extrusion section, the outer diameter of the feeding end is larger than the outer diameter of the discharging end, a positioning convex ring is arranged on the outer wall of the diversion and positioning section, and a diversion port penetrating through the positioning convex ring is arranged on the positioning convex ring; a communicating diversion cavity and an extrusion and glue coating cavity are arranged in the outer shell sleeve; when the inner tube core is assembled and connected with the outer shell sleeve, the inner tube core is inserted into the outer shell sleeve, the positioning convex ring is in interference fit with the inner wall of the diversion cavity, the extrusion section is inserted into the extrusion and glue coating cavity, and the discharging port of the extrusion section is located in the extrusion and glue coating cavity.
[0005] In the self - centering die for extruding cable insulation or sheath of the present utility model, the inner tube die core is inserted into the outer shell die sleeve and connected with the outer shell die sleeve through interference fit. The connection is simple and convenient. After assembly, the central axis of the inner tube die core coincides with the central axis of the outer shell die sleeve, that is, the gap thickness between the inner tube die core and the outer shell die sleeve is uniform. When using a heating furnace equipped with the self - centering die for extruding cable insulation or sheath of the present utility model to perform encapsulation treatment on the cable core to be encapsulated to form the insulation outer layer or sheath of the cable, the cable core to be encapsulated is passed through the inner tube die core and advances at a uniform speed during the encapsulation process; the encapsulation raw material is heated and melted in the heating furnace to form an encapsulation liquid, which flows into the diversion cavity between the inner tube die core and the outer shell die sleeve from the feed end of the self - centering die for extruding cable insulation or sheath of the present utility model. And the encapsulation liquid in the diversion cavity flows to the extrusion encapsulation cavity through the diversion port, and a uniformly - thickened rubber film is extruded through the cooperation of the outer wall of the extrusion section and the cavity wall of the extrusion encapsulation cavity. And this rubber film is coated on the surface of the cable core to be encapsulated to form the insulation outer layer or sheath of the cable when the cable core to be encapsulated passes by. In this way, since the gap thickness between the inner tube die core and the outer shell die sleeve in the self - centering die for extruding cable insulation or sheath of the present utility model is uniform, the encapsulation liquid flowing into the extrusion encapsulation cavity is evenly distributed around the extrusion section in the inner tube die core, so that a uniformly - thickened rubber film is extruded through the cooperation of the outer wall of the extrusion section and the cavity wall of the extrusion encapsulation cavity and coated on the cable core to be encapsulated, and further the thickness of the insulation outer layer or sheath of the cable formed by encapsulating the cable core to be encapsulated is uniform, improving the production quality of the cable. Thus, it can be seen that when using a heating furnace equipped with the self - centering die for extruding cable insulation or sheath of the present utility model to perform encapsulation operation on the cable core to be encapsulated, the uniformity of the thickness of the insulation outer layer or sheath of the cable formed by encapsulation can be improved, and further the production quality of the cable can be improved.
[0006] Preferably, a plurality of the diversion ports are evenly distributed on the positioning convex ring, and the diversion ports are located on the same circumference. In this way, evenly distributing a plurality of diversion ports on the positioning convex ring can not only increase the flow rate of the encapsulation liquid when flowing into the extrusion encapsulation cavity, avoid the accumulation of the encapsulation liquid in the diversion cavity near the feed end, which affects the encapsulation speed, but also use the plurality of diversion ports to divide the flow of the encapsulation liquid flowing into the extrusion encapsulation cavity, improve the uniformity of the distribution of the encapsulation liquid in the extrusion encapsulation cavity, thereby improving the uniformity of the thickness of the insulation outer layer or sheath of the cable formed by encapsulation, and further improving the production quality of the cable. Further, the diversion port is a tooth - groove structure. In this way, using the tooth - groove structure as the diversion port, when manufacturing the inner tube die core in the self - centering die for extruding cable insulation or sheath of the present utility model, only need to open tooth - grooves on the positioning convex ring to form the diversion port, the production and processing are simple and convenient, the production and processing efficiency can be improved, and the production and processing cost can be reduced.
[0007] Preferably, at least two positioning convex rings are provided on the outer wall of the diversion and positioning section, and the distance between any two adjacent positioning convex rings is greater than the axial width of the positioning convex ring. In this way, during encapsulation, the encapsulation liquid is divided at least twice during the process of flowing towards the extrusion encapsulation cavity, which can further improve the thickness uniformity of the insulating outer layer or sheath of the cable formed by encapsulation.
[0008] Preferably, the inner cavity of the diversion and positioning section is a tapered frustum-shaped cavity. In this way, when threading the cable core to be encapsulated into the self-aligning core die for extruding the cable insulation or sheath of the present invention, the operation is simple and convenient. Further, both the connection section and the extrusion section are straight pipe structures, and a connection thread is provided on the outer wall of the connection section. In this way, when assembling the self-aligning core die for extruding the cable insulation or sheath of the present invention into the encapsulation device through the connection section, the straight pipe-shaped connection section can be threadedly connected to the mating part through the connection thread, and the assembly is simple and convenient; when the straight pipe-shaped extrusion section is inserted into the extrusion encapsulation cavity, the length of the annular gap formed between the extrusion section and the outer shell die sleeve can be extended, thereby improving the distribution uniformity of the encapsulation liquid around the extrusion section, and further improving the thickness uniformity of the insulating outer layer or sheath of the cable formed by encapsulation.
[0009] Preferably, the extrusion encapsulation cavity is a cylindrical cavity. In this way, after the encapsulation liquid flows into the extrusion encapsulation cavity, the flow rate of the encapsulation liquid can be slowed down, avoiding problems such as uneven thickness caused by piling up of the insulating outer layer or sheath formed by encapsulation due to too fast flow rate of the encapsulation liquid, and even affecting the production quality of the cable. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 is a schematic structural diagram of the self-aligning core die for extruding the cable insulation or sheath of the present invention with a cable core to be encapsulated inserted therein;
[0011] Figure 2 is a schematic structural diagram of the inner tube die core in the self-aligning core die for extruding the cable insulation or sheath of the present invention;
[0012] Figure 3 is a schematic structural diagram of the outer shell die sleeve in the self-aligning core die for extruding the cable insulation or sheath of the present invention;
[0013] Figure 4 is Figure 3 the schematic cross-sectional structure diagram taken along A-A in DETAILED DESCRIPTION OF THE EMBODIMENTS
[0014] Next, in combination with Figures 1 to 4 , the self-aligning core die for extruding the cable insulation or sheath of the present invention will be described in detail.
[0015] As shown in Figures 1 to 4As shown in the figure, the self-aligning core die for extruding cable insulation or sheath of the present utility model includes an inner tube die core 1 and an outer shell die sleeve 2. Among them, the inner tube die core 1 includes a connection section 11, a diversion and positioning section 12, and an extrusion section 13 that are collinearly connected to the inner tube. The feeding end of the diversion and positioning section 12 is connected to the connection section 11, and the discharging end of the diversion and positioning section 12 is connected to the extrusion section 13. The outer diameter of the feeding end is greater than that of the discharging end. A positioning convex ring 121 is provided on the outer wall of the diversion and positioning section 12, and a diversion port 1211 penetrating the positioning convex ring 121 is provided on the positioning convex ring 121; a communicated diversion cavity 21 and an extrusion and encapsulation cavity 22 are provided in the outer shell die sleeve 2; when the inner tube die core 1 is assembled and connected to the outer shell die sleeve 2, the inner tube die core 1 is inserted into the outer shell die sleeve 2, the positioning convex ring 121 is in interference fit with the inner wall of the diversion cavity 21, the extrusion section 13 is inserted into the extrusion and encapsulation cavity 22, and the discharging port of the extrusion section 13 is located in the extrusion and encapsulation cavity 22. Preferably, a plurality of diversion ports 1211 are evenly distributed on the positioning convex ring 121, and the diversion ports 1211 are located on the same circumference. In this way, by evenly distributing a plurality of diversion ports 1211 on the positioning convex ring 121, it can not only increase the flow rate of the encapsulating liquid flowing into the extrusion and encapsulation cavity 22, avoid the accumulation of the encapsulating liquid in the diversion cavity 21 near the feeding end and affect the encapsulation speed, but also use the plurality of diversion ports 1211 to divert the encapsulating liquid flowing into the extrusion and encapsulation cavity 22, improve the uniformity of the distribution of the encapsulating liquid in the extrusion and encapsulation cavity 22, thereby improving the uniformity of the thickness of the insulating outer layer or sheath of the cable formed by encapsulation, and further improving the production quality of the cable. Preferably, the diversion port 1211 is a tooth groove structure. In this way, by using the tooth groove structure as the diversion port 1211, when manufacturing the inner tube die core 1 in the self-aligning core die for extruding cable insulation or sheath of the present utility model, only by opening tooth grooves on the positioning convex ring 121 can the diversion port 1211 be formed. The production and processing are simple and convenient, the production and processing efficiency can be improved, and the production and processing cost can be reduced. Preferably, at least two positioning convex rings 121 are provided on the outer wall of the diversion and positioning section 12, and the distance between any two adjacent positioning convex rings 121 is greater than the axial width of the positioning convex ring 121. In this way, during encapsulation, the encapsulating liquid is divided at least twice during the process of flowing into the extrusion and encapsulation cavity 22, and the thickness uniformity of the insulating outer layer or sheath of the cable formed by encapsulation can be further improved. Preferably, the inner cavity (not shown in the figure) of the diversion and positioning section 12 is a tapered frustum-shaped cavity. In this way, when threading the cable core 3 to be encapsulated into the self-aligning core die for extruding cable insulation or sheath of the present utility model, the operation is simple and convenient. Preferably, both the connection section 11 and the extrusion section 13 are straight tube structures, and a connection thread 111 is provided on the outer wall of the connection section 11.In this way, when the self - centering die for extruding the cable insulation or sheath of the present utility model is assembled into the encapsulation device through the connecting section 11, the connecting section 11 with a straight - tube structure can be threadedly connected to the mating part through the connecting thread 111, and the assembly is simple and convenient. When the extruding section 13 with a straight - tube structure is inserted into the extrusion encapsulation cavity 22, the length of the annular gap formed between the extruding section 13 and the outer shell die sleeve 2 can be extended, thereby improving the uniformity of the distribution of the encapsulation liquid around the extruding section 13, and further improving the uniformity of the thickness of the insulation outer layer or sheath of the cable formed by encapsulation. Preferably, the extrusion encapsulation cavity 22 is a cylindrical cavity. In this way, after the encapsulation liquid flows into the extrusion encapsulation cavity 22, the flow rate of the encapsulation liquid can be slowed down, avoiding problems such as uneven thickness caused by piling up of the insulation outer layer or sheath formed by encapsulation due to the too - fast flow rate of the encapsulation liquid, and even affecting the production quality of the cable.
[0016] In the self - centering die for extruding the cable insulation or sheath of the present utility model, the inner tube die core 1 is inserted into the outer shell die sleeve 2 and connected to the outer shell die sleeve 2 by interference fit. The connection is simple and convenient, and after assembly, the central axis of the inner tube die core 1 coincides with the central axis of the outer shell die sleeve 2, that is, the thickness of the gap between the inner tube die core 1 and the outer shell die sleeve 2 is uniform. When using a heating furnace equipped with the self - centering die for extruding the cable insulation or sheath of the present utility model to encapsulate the cable core to be encapsulated to form the insulation outer layer or sheath of the cable, the cable core 3 to be encapsulated is threaded through the inner tube die core 1 and advances at a constant speed during the encapsulation process. The encapsulation raw material is heated and melted in the heating furnace to form an encapsulation liquid, which flows into the diversion cavity 21 between the inner tube die core 1 and the outer shell die sleeve 2 from the feeding end of the self - centering die for extruding the cable insulation or sheath of the present utility model. And the encapsulation liquid in the diversion cavity 21 flows to the extrusion encapsulation cavity 22 through the diversion port 1211, and a uniformly - thickened rubber film is extruded through the cooperation between the outer wall of the extruding section 13 and the cavity wall of the extrusion encapsulation cavity 22. And this rubber film is coated on the surface of the cable core 3 to be encapsulated to form the insulation outer layer or sheath of the cable (not shown in the figure) when the cable core 3 to be encapsulated passes by. In this way, since the thickness of the gap between the inner tube die core 1 and the outer shell die sleeve 2 in the self - centering die for extruding the cable insulation or sheath of the present utility model is uniform, the encapsulation liquid flowing into the extrusion encapsulation cavity 22 is uniformly distributed around the extruding section 13 on the inner tube die core 1. Thus, a uniformly - thickened rubber film is extruded through the cooperation between the outer wall of the extruding section 13 and the cavity wall of the extrusion encapsulation cavity 22 and coated on the cable core to be encapsulated, and further, the thickness of the insulation outer layer or sheath formed by encapsulation on the cable core 3 to be encapsulated is uniform, improving the production quality of the cable. It can be seen that when using a heating furnace equipped with the self - centering die for extruding the cable insulation or sheath of the present utility model to perform the encapsulation operation on the cable core 3 to be encapsulated, the uniformity of the thickness of the insulation outer layer or sheath of the cable formed by encapsulation can be improved, and further, the production quality of the cable can be improved.
Claims
1. A self-coring die for extrusion of cable insulation or sheath, characterized in that: The self-centering mold comprises an inner tube mold core and an outer shell mold sleeve, the inner tube mold core comprises a connecting section, a flow guide positioning section and an extrusion section which are connected in a colinear manner with the inner tube, the feed end of the flow guide positioning section is connected to the connecting section, the discharge end of the flow guide positioning section is connected to the extrusion section, the outer diameter of the feed end is larger than the outer diameter of the discharge end, a positioning convex ring is provided on the outer wall of the flow guide positioning section, and a flow guide port which passes through the positioning convex ring is provided on the positioning convex ring; a connected flow guide cavity and an extrusion coating cavity are provided in the outer shell mold sleeve; when the inner tube mold core is assembled and connected with the outer shell mold sleeve, the inner tube mold core is inserted into the outer shell mold sleeve, the positioning convex ring is interference fit with the inner wall of the flow guide cavity, the extrusion section is inserted into the extrusion coating cavity, and the discharge port of the extrusion section is located in the extrusion coating cavity.
2. The self-coring die for cable insulation or sheath extrusion according to claim 1, characterized in that: A plurality of the guide ports are evenly distributed on the positioning convex ring, and the guide ports are located on the same circumference.
3. The self-coring die for cable insulation or sheath extrusion according to claim 2, characterized in that: The guide port is a tooth groove structure.
4. The self-coring die for cable insulation or sheath extrusion according to any one of claims 1 to 3, characterized in that: At least two positioning convex rings are arranged on the outer wall of the flow guide positioning section, and the distance between any two adjacent positioning convex rings is greater than the axial width of the positioning convex ring.
5. The self-coring die for cable insulation or sheath extrusion according to any one of claims 1 to 3, characterized in that: The inner cavity of the diversion positioning section is a conical table-shaped cavity.
6. The self-coring die for cable insulation or sheath extrusion according to claim 5, characterized in that: The connecting section and the extruding section are both straight tube structures, and connecting threads are arranged on the outer wall of the connecting section.
7. The self-coring die for cable insulation or sheath extrusion according to any one of claims 1 to 3, characterized in that: The extrusion coating cavity is a cylindrical cavity.