A double-layer sheath head

Abstract

The invention discloses a double-layer sheath machine head which comprises an extrusion cavity, an outer feeding hole, an outer runner, an inner feeding hole, an inner runner and a first insulation cover, wherein the extrusion cavity is formed in a machine head body and consists of a die sleeve and a die core; the outer feeding hole is formed in the front end of the machine head body; the outer runner is encircled by an outer gel separation body arranged in the machine head body and the machine head body; the outer feeding hole is communicated with the extrusion cavity by virtue of the outer runner; the inner feeding hole is formed in the rear end of the machine head body; the inner runner is encircled by an inner gel separation body arranged in the machine head body and the machine head body; the inner feeding hole is communicated with the extrusion cavity by virtue of the inner runner; the first insulation cover is used for separating the overlapped parts of the outer runner and the inner runner along the axial direction of the machine head body; and in the using process, the outer gel separation body is separated from the inner runner by virtue of the first insulation cover, namely the first insulation cover is increased between the outer extrusion material and the inner extrusion material in addition to the outer gel separation body. Therefore, mutual influence between the inner and outer extrusion materials of different temperatures can be avoided, the product quality is further guaranteed, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of extrusion molding equipment, in particular to a double-layer sheath head. Background technique [0002] Armored cables are made of different material conductors packed in metal sleeves with insulating materials and processed into a bendable solid assembly. Generally, armored cables need to have double-layer sheaths. Therefore, in the production process of armored cables, the double-layer sheath head is an important part of the production line and belongs to the core equipment of cable production. [0003] In the prior art, see figure 1 , figure 1 It is a structural schematic diagram of a double-layer sheathed head in the prior art. The double-layered sheathed head includes a head body 10, a heating tile 5 arranged outside the head body 10, and a mold cover arranged in the head body 10. 1 and the extrusion cavity 2 composed of the core 3, the outer layer feed port 6 and the inner layer feed port 11 arra...

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Problems solved by technology

[0003] In the prior art, see figure 1 , figure 1 It is a structural schematic diagram of a double-layer sheathed head in the prior art. The double-layered sheathed head includes a head body 10, a heating tile 5 arranged outside the head body 10, and a mold cover arranged in the head body 10. 1 and the extrusion cavity 2 composed of the core 3, the outer layer feed port 6 and the inner layer feed port 11 arranged on the die body 10, the outer layer connecting the outer layer feed port 6 and the extrusion cavity 2 The flow channel 4 and the inner layer flow channel 8 connecting the inner layer feed port 11 with the extrusion chamber 2, it can be seen from the figure that the inner layer flow channel 8 is surrounded by the inner layer colloid 9 and the outer layer colloid 7 That is, the overlapping part of the outer layer flow channel 4 and the inner layer flow channel 8 along the axial direction of the head body 10 is only separated by the outer layer of colloid 7, while in the actual production process, the inner layer extrusion material is high-density polymer Ethylene, the extrusion temperature is between 190°C and 230°C, the outer extrusion material is low-density polyethylene, the extrusion temperature is between 115°C and 155°C, the temperature difference between the two extrusion materials is large, and only through The outer layer of colloid 7 separates it, which will cause the temperature of the inner extruded material to decrease, and the surface will not be smooth after extrusion; the temperature of the outer extruded material will increase, and the outer extruded material will become thinner, and the outer layer will The extruded material sticks to the inner layer material as soon as it is extruded, so that the outer layer material can only cover the inner layer material for about half a week

The outer layer material cannot completely and evenly cover the inner layer, which will eventually lead to an increase in the defective rate and production cost

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