CN100426611C

CN100426611C - An electric wire and cable plastic clad mold

Info

Publication number: CN100426611C
Application number: CNB2004100271870A
Authority: CN
Inventors: 郑五; 郑维凯; 陈焕武
Original assignee: GUANGDONG JINHUA CABLE Co Ltd
Current assignee: GUANGDONG JINHUA CABLE Co Ltd
Priority date: 2004-05-14
Filing date: 2004-05-14
Publication date: 2008-10-15
Anticipated expiration: 2024-05-14
Also published as: CN1571228A

Abstract

The present invention relates to a longitudinal coating and extruding plastic mould of wires and cables, which is composed of an extruder head, a mould core and a mould shell, wherein the extruder head is in a hollow cylinder shape, and the side wall of the middle part is provided with a feed port; the mould core is sheathed in a through hole of the extruder head and can form definite gap with the inner wall of the extruder head; the mould core is provided with a passage for passing a cable; the mould shell is in a loudspeaker shape and is arranged on an extruding opening of the extruder head. The present invention is characterized in that one side of the entering direction approaching to the cable at the feed port is provided with a sealing ring which has an angle smaller than 90 DEG with the entering direction of the cable, and the gap between the inner wall of the extruder head and the mould core can be sealed. The insulating layer of wires and cables of the present invention can not generate air bubble hard blocks, and the quality and the productive efficiency of wires and cables can be largely enhanced.

Description

A kind of electric wire is moulded the bag mould

Technical field:

The present invention relates to a kind of mould of producing cable, relate to the vertical bag of a kind of electric wire extrusion molding specifically and touch tool.

Background technology

At present, the most employing of the insulating package layer of electric wire is extrusion molding, vertical technology of the package, cable extrusion molding particular manufacturing craft commonly used as shown in Figure 3, mainly form by injection molding machine head mould core and die sleeve, core rod is placed in the inner and inner gap that forms of head of head, die sleeve is loaded on head extrusion place, and the control cable covers the thickness of insulating barrier, and the quality of cable wrap insulate layer and efficient are subjected to all multifactor influences.Head shown in Fig. 3 exists following shortcoming, first; When plastics enter inside in the head, direction that it advances and core rod are at an angle of 90, reason is that injection molding machine has certain pressure, and the tendency of plastics enters head from flange port, because there is the resistance of core rod head inside, it has from the inside of head and gets ahead in this case, the outside by the core rod resistance, and raw material just reduces naturally, and promptly the side near charging aperture is many, away from the few phenomenon of a side of charging aperture, the thickness adjustment difficulty of cable insulation under the situation like this; The second, the inner space with core rod of head is too big, holds material and distinguishes corresponding long, normal working hours one is long, the material that arrives first can not arrive thoroughly at the head wall and walk out, and will produce lump, burn or phenomenon such as bubble occurs, and finally causes unstable product quality or waste product too much.The inventor improves above-mentioned mistake point through for many years practice.

Summary of the invention

The object of the present invention is to provide a kind of electric wire extruded mould, the wire cable insulating layer that this extruded mould is produced bubble or lump can not occur, improves the quality and and the production efficiency of electric wire greatly.

The object of the present invention is achieved like this: a kind of electric wire is moulded the bag mould; By extruder head, core rod, die sleeve is formed, extruder head middle part sidewall has a charging aperture, core rod is placed in the extruder head and is gapped with the head inwall, gap and feeding inlet, the passage that core rod has current supply cable to pass through, die sleeve is horn-like, be loaded on the head extrusion, it is characterized in that less than: by cable approach axis one side, have one to become sealing ring that the gap between head inwall and the core rod is sealed at charging aperture less than 90 ° with the cable approach axis, the angle of sealing ring inclined-plane and cable approach axis is 20 °-60 °, and the best is 35 ° of angles.

Description of drawings

Below in conjunction with accompanying drawing the present invention is further described in detail:

Fig. 1 is an electric wire extrusion die cutaway view of the present invention;

Fig. 2 is sealing ring structure chart in the mould of the present invention;

Fig. 3 moulds bag mould inside structure chart for the origin wire cable;

The number in the figure explanation; 1, head, 2, core rod, 3, die sleeve, 4, sealing ring, 5, cable, 6, charging aperture.

Embodiment

With reference to Fig. 1, Fig. 2, the present invention is by extruder head 1, core rod 2, die sleeve 3 is formed, extruder head is a hollow tube-shape, its middle part barrel has a charging aperture 6, charging aperture is generally circle, core rod is placed in the head through hole and with the head inwall certain clearance, the passage that core rod has current supply cable 5 to pass through, and the core rod outlet is for horn-like, die sleeve is also for horn-like and match with core rod, be loaded on the head extrusion, by cable approach axis one side, have one to become sealing ring 4 that the gap between head inwall and the core rod is sealed less than 90 ° with the cable approach axis at charging aperture.

The straight angle of sealing ring inclined-plane and cable approach axis is general 20 °-60 °, and being preferably best angle is 35 °.

Establish an effect that becomes with the cable approach axis less than the sealing ring of 90 ° of angles in charging aperture cable approach axis one side, be actually the space that reduces to hold the material district, the space of charging aperture electric wire approach axis one side head and core rod less than effect, can have influence on the quality of cable for the plastic flow of injection moulding on the contrary.This sealing ring upper end is preferably near charging aperture but can not block charging aperture, and makes the arc identical with the charging aperture radian, and thickness can not limit, and can be a circle, can be a wedge, as shown in Figure 2 yet.The angle reality that its inclined-plane and cable approach axis form is regulated according to factors such as the thickness of cable insulation, charging rates.Be generally general 20 °-60 °, being preferably best angle is 30 °-35 °, can both obtain good effect.

The head charging aperture is made funnel-form or be half of in sealing ring opposite one side is funnel-form.Raw material enters charging aperture from the injection molding machine head and makes into tubaeform, mainly be to increase the pressure that enters head, because of former expect to enter in the head promote entirely by sieve bar rotating speed, charging aperture funnel limit and core rod form 30 ° of angles, raw material enters head can come the conversion trend by the resistance of angle, raw material is directly walked from inner face quickly, under the formation of resistance, natural walks toward outside, and reduce relatively in space outside, make the raw material of outside go to the distance shortening of touching cover, adjust inside and outside trend by different angles, it can be walked out like this, can guarantee the accuracy of adjustment polarization degree again, stability, handled easily and control.

Claims

1. an electric wire is moulded the bag mould; By extruder head, core rod, die sleeve is formed, extruder head middle part sidewall has a charging aperture, core rod is placed in the extruder head and is gapped with the head inwall, gap and feeding inlet, the passage that core rod has current supply cable to pass through, die sleeve is horn-like, be loaded on the head extrusion, it is characterized in that: by cable approach axis one side, have one to become the sealing ring less than 90 ° that the gap between head inwall and the core rod is sealed with the cable approach axis at charging aperture, the angle of sealing ring inclined-plane and cable approach axis is 20 °-60 °.

2. mould according to claim 1 is characterized in that: sealing ring inclined-plane and cable approach axis angle are 35 °.