CN2566425Y - Electric cable core insulating three-layer co-extruder head - Google Patents

Abstract

The utility model relates to an electric cable core insulating three-layer co-extruder head which is mainly characterized in that a head body is provided with a flow channel for injecting cable materials, and the other flow channels are formed among an inner fluid dividing body, a middle fluid dividing body and relative components. Channel openings on the post surfaces of the fluid dividing bodies are provided with approximate n-shaped channels along an axial direction; the tail ends are divided into branch channels in a V shape; the front ends meet interfaces. Thus, a three-layer co-extruder is formed. Melting cable material can be coated on a cable core at the extruding opening through a mould cavity. The granulation processing of the raw material by using a special graft is abandoned. The graft and molding can be once accomplished. Moreover, all the layers can be integrally combined into a cable. The quality of the performance is stable. The voltage level can be lifted from 1 kV to 10 kV. The electric cable core insulating three-layer co-extruder head can process silane cross-linking fire retarding cables, fireproof cables, waterproof cables, 10 kV overhead cables, etc.

Description

Cable core insulation is three-layer co-extruded to go out machine head

Technical field:

The utility model is a kind of special equipment of improved cables manufacturing, and the insulation of specifically a kind of cable heart yearn is three-layer co-extruded to go out machine head, is to belong to H01B13/14 by international Patent classificating number.

Background technology:

In the cross-head product that existing cable is made, by (ZL90209995.7) patent of China Intellectual Property Office's disclosed a kind of " insulating exruded machine head of cable core ", comprise outer die casing, internal mold shuttle and headstock composition, in headstock one side one injecting hole is arranged, in communicate with the cavity of headstock front portion, cavity is made of equal gland, outer mould base, external mold, make plastics form equal pressure condition at this, internal mold shuttle axle center is that heart yearn passes the hole, and outer die casing is equipped with Electrothermal ring and keeps the interior plastics temperature of head.Another kind of patented technology is " dual-color plastic extrusion molding mould " (ZL89202790.8) patent, for being exclusively used in the manufacturing of dual-color plastic lead, constitute by mold, shunting cover, internal mold and external mold, by forming die cavity between internal mold and the external mold, two material hand-holes are arranged on the mold, cooperate the shunting cover that two passages are respectively arranged, meet in the die cavity, obtain different color separation structures to change different shunting covers in its exit.Above-mentioned technical products is finished and is extruded the insulation coated prod, two kinds of equipment of general employing are made two steps and are finished, promptly elder generation raw material grafting granulation, respectively becomes two kinds of materials of A, B at a special equipment, A, B mixing of materials is made in cable factory then together again and extrudes cable molding.And wherein the raw material shelf-life be half a year, A, B material mixes the time of guaranteeing the quality and has only 24 hours, the precrosslink phenomenon occurs toward the contact meeting in manufacture process, causes unstable product quality; , insulating barrier bad as internal layer shielding, that outer shielding coats uneven distribution is even, takes place breakdown when transmitting electric power easily; Also may produce each layer structure and not melt the one problem; And electric pressure is below 1KV.

Summary of the invention:

The utility model order is overcoming above-mentioned technical deficiency, to improve the structure of cross-head, shape, ban independent the need with equipment grafting granulation process, and it is incorporated on the cross-head, can settle at one go, the insulation of a kind of cable core is three-layer co-extruded to go out machine head, be by head, material channel, divide fluid, the die sleeve core rod, heater is formed, the location swivel nut 1 that it is characterized in that extrusion, inner edge press-fits die sleeve pad 2, die orifice pad 3, die sleeve 5, and by adapter sleeve 4, pressing overcoat 10, be installed in handpiece body 13 extruding ends, core rod 6 is housed in it, core rod cover 7, lining 9, center die 23 have with it runner alternate be die sleeve 8, wherein divide the fluid branch that interior fluid 11 and middle minute fluid 12 of dividing arranged, cover 14 is installed respectively in the endoporus of interior minute fluid 11 in the heater and adds hot jacket 15, heater holder 16 1 ends of follower head are by installation end and middle minute fluid 12 back client links of interior minute fluid 11, the end binding vacuumizes cover 17 in addition, link the core cover 18 that has feed line core centre bore in its rear end, and fixed with swivel nut 19; On interior minute fluid 11, middle minute fluid 12, handpiece body body 13, three kinds of runners are arranged respectively, the corresponding material flow road junction that is communicated with, the injecting material passage at relative current road junction is respectively 45 machine necks, 20,100 machine necks 21 and 60 machine necks 22; Between the core rod at extrusion place cover 7, center die 23, middle minute fluid 12 and die sleeve pad 2, die sleeve 5, overcoat 10, and between center die 23 and the interior minute fluid 11, and all have die cavity between die sleeve 8 and the overcoat 10; In divide fluid 11 and middle minute fluid 12, be " ∏ " shape groove vertically from the cylinder face, slightly be " people " font respectively to two ends, at its groove end runner that is circumferential connection.The turning of runner and trend: increase radius of corner R85～90mm, the r10 that turns round for a short time～15mm adopts slick and sly switching, makes runner unobstructed, and groove width is widely to have narrowed down 1/2～1/4 by former, and groove depth has changed shallow than originally 1/2～1/3.Reducing the outlet, thereby strengthen the fluid foods injection pressure, make the cable quality of producing reliable and stable, do not have the grafting granulation process, reduced operation, equipment; The employed raw material time limit of not guaranteeing the quality, no precrosslink phenomenon makes to dissolve CABLE MATERIALS each layer structure under the prerequisite that has ensured insulating properties and be and be the one state in extrusion.

Description of drawings:

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the utility model overall structure cutaway view.

Fig. 2 is the component structure figure of interior minute fluid.

Fig. 3 is the passage expanded view of Fig. 2.

Fig. 4 is the passage expanded view of middle minute fluid.

Among the figure: 1. swivel nut 2. die sleeve pads 3. die orifice pads 4. adapter sleeves 5. die sleeves 6. core rods 7. core rods overlap to divide in 8. die sleeves, 9. linings, 10. overcoats 11. and divide in fluid 13. handpiece bodies 14. heaters cover 15. heater jackets 16. heater holders 17. to vacuumize cover 18. cores in the fluids 12. to overlap core rod in 19. swivel nuts, 20. 45 machine necks, 21. 100 machine necks, the 22. 60 machine necks 23..

Embodiment:

Referring to Fig. 1, the insulation of a kind of cable core is three-layer co-extruded to go out machine head, by overlapping 14 in swivel nut 1, die sleeve pad 2, die orifice pad 3, adapter sleeve 4, die sleeve 5, core rod 6, core rod cover 7, die sleeve 8, lining 9, overcoat 10, interior minute fluid 11, middle minute fluid 12, handpiece body 13, the heater, heater jacket 15, heater holder 16, vacuumizing 45 machine necks, 20,100 machine necks, 21, the 60 machine necks 22 that cover 17, core cover 18, swivel nut 19, middle core rod 23 and interior, domestic and abroad injecting material three laminar flow roads are connected and form.Swivel nut 1 is contained in die sleeve pad 2, die orifice pad 3, die sleeve 5 on the overcoat 10, and is installed in handpiece body 13 extrusion ends by adapter sleeve 4.Core rod 6, core rod cover 7, lining 9 and middle core rod 23 and die sleeve 8 are housed in it.Interior branch fluid 11 outsides are middle minute fluids 12, its outer handpiece body 13 that connects, and interior minute fluid 11 inner hole walls are equipped with and connect cover 14 in the heater in the heater jacket 15.Heater holder 16 (energising adds on the thermal map not shown) is installed limit and middle fen fluid 12 end connections by interior minute fluid 11 termination, and the termination links in addition vacuumizes cover 17 and send mouth at core, and core cover 18 and fixing with swivel nut 19 is housed.Referring to Fig. 2, the 3rd, interior minute fluid 11 structure chart and runner expanded view thereof, two-way the drawing axially of runner mouth is " ∏ " shape, transfers to slightly in the by-path lower end to be " people " word, and die cavity is gone in its termination tandem.Referring to Fig. 4, it is the passage expanded view of middle minute fluid 12, its passage turning circular arc radius strengthens, R 〉=85mm is similar to fluidic architecture, the slick and sly switching of " people " font top turning r=10mm, and the access die cavity is converged in its termination, the reducing-pitch thread variable section runner, cause and improved pressure between CABLE MATERIALS fusion fusion line sandwich layer, it is integrated to reach alternate nothing layer, and the insulating barrier thin and thick is even.With three-layer co-extruded extruder do the molten PE of mixing oven dry back and liquid silane and auxiliary agent grafting moulding carry out warm water crosslinking insulated product, changed the present situation that the above cable of 1KV in the past must be produced on the crosslinked machine of stretched wire with high costs, developed cross-linking flame-retardant thus, cables such as fire-resistant, waterproof, 10KV insulated aerial, each all meets GB12706-91, GB12666.5-90 and GB14049-1993 regulation voluntarily.

Claims (3)

1, the insulation of a kind of cable core is three-layer co-extruded to go out machine head, be by head, material channel, divide fluid, die sleeve, core rod, heater block is formed, the location swivel nut (1) that it is characterized in that extrusion, inner edge press-fits die sleeve pad (2), die orifice pad (3), die sleeve (5), and by adapter sleeve (4), pressing overcoat (10), be installed in handpiece body (13) extruding end, core rod (6) is housed in it, core rod cover (7), lining (9), center die (23) have with it runner alternate be die sleeve (8), wherein divide the fluid branch that interior fluid (11) and middle minute fluid (12) of dividing arranged, interior minute fluid (11) endoporus in cover (14) is installed respectively in the heater and adds hot jacket (15), heater holder (16) one ends of follower head by interior minute fluid (11) installation end and middle minute fluid (12) back client link, the end binding vacuumizes cover (17) in addition, link the core cover (18) that has feed line core centre bore in its rear end, and fixed with swivel nut (19); On interior minute fluid (11), middle minute fluid (12), handpiece body (13), three kinds of runners are arranged respectively, the corresponding material flow road junction that is communicated with, the injecting material passage at relative current road junction is respectively 45 machine necks (20), 100 machine necks (21) and 60 machine necks (22); Between the core rod cover (7) at extrusion place, center die (23), middle minute fluid (12) and die sleeve pad (2) die sleeve (5), overcoat (10), and between center die (23) and interior minute fluid (11), and all have die cavity between die sleeve (8) and the overcoat (10).

2, the three-layer co-extruded machine head that goes out according to claim 1, divide fluid (11) and middle minute fluid (12) in it is characterized in that, be " ∏ " shape groove vertically from the cylinder face, slightly be " people " font respectively to two ends, at its groove end runner that is circumferential connection.

3, the three-layer co-extruded machine head that goes out according to claim 1 and 2, the turning and the trend of dividing fluid (11) and middle minute fluid (12) runner in being characterised in that: increase radius of corner R85～90mm, for a short time r10～the 15mm that turns round adopts slick and sly switching, make runner unobstructed, and groove width is widely to have narrowed down 1/2～1/4 by former, and groove depth has changed shallow than originally 1/2～1/3.

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