JPH0530371B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an extrusion molding apparatus for cables with support wires (hereinafter referred to as SS cables).

[Conventional technology and its problems]

As shown in FIG. 4, the SS cable P includes a support wire a made of galvanized steel stranded wire, as is well known.
The insulated core wires are twisted in pairs or star-twisted, and then the cable core b is made parallel to the cable core b, which is twisted together, pressed and wound, or subjected to shielding treatment, and an outer jacket c made of high-density polyethylene or the like is extruded on top of the cable core b. This is what happens.

In order to extrude the jacket of the SS cable P, as shown in FIG.
After integrally extruding the outer sheath c on top, the cable P is submerged and passed through the cooling water tank B to form the outer sheath c.
Cool and solidify.

By the way, when manufacturing this SS cable, cables that are twisted between the support wire portion and the cable core portion are often produced as shown in FIG. This is due to the untwisting of the galvanized steel wires constituting the support wire a and the untwisting of the cable core b.The jacket c is extruded and enters the cooling water tank B, and the resin of the jacket c is sufficiently hardened. This is because if the untwisting force acts until the shape is fixed, the shape will be fixed in the twisted state.

From the above, conventionally, as shown in Fig. 1, the extruded SS cable P is connected to the cooling water tank B.
However, there are cases where this is not effective, or where the surface of the outer cover c is dented by the correction rollers D.

This depends on the size of the cable.
The time it takes to solidify in water tank B is different, and the correction roller D
If the resin of the outer cover c hardens before it is clamped, the effect will not be apparent, and if the resin of the outer cover c is soft and it is clamped by the straightening roller D, it will become sagging. be.

[Purpose of the invention]

In view of the above points, it is an object of the present invention to provide an extrusion molding apparatus for an SS cable in which twisting does not occur between the support line portion and the table core portion of the SS cable.

[Means to achieve the purpose]

In order to achieve the above object, in the present invention, the support wire and the cable core are fed in parallel, and the cable is placed at the rear stage of an extrusion molding machine that integrally forms the jacket on both of them. In the above-mentioned extrusion molding apparatus for cables with support wires, which is equipped with a cooling water tank through which water passes through, and a straightening roller for clamping the cable in the water tank, the distance between the entrance of the cable to the cooling water tank and the straightening roller is determined. This made it adjustable.

As the adjustment means, it is possible to make the cooling water tank portion between the cooling water tank inlet and the straightening roller have a telescoping structure, or to make the straightening roller movable back and forth in the cable running direction.

[Effect]

The extrusion molding device configured in this way produces SS cables in the same manner as described above, but the
The distance between the cooling water tank and the straightening roller is adjusted according to the cable size, and the straightening roller is positioned so as to clamp the jacket just before it hardens.

If an SS cable is manufactured in the same manner as before in this set state, the straightening roller will also support and position the jacket just before it hardens.
The outer cover is corrected in shape and solidified without sagging.

〔Example〕

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, cable core b and support wire a are fed from a supply drum and introduced into crosshead 1 of extruder A in parallel. High-density polyethylene extruded from an extrusion molding machine A is extruded onto the introduced table core b and support line a to have a cross-sectional shape. The outer cover c is made of high-density polyethylene and is extruded into a cross-sectional shape.
It does not harden immediately and is in the form of a paste, and is cooled by cooling water in the cooling water tank B to solidify and fix its shape.

An accordion-shaped auxiliary water tank B' is connected to the inlet side of the water tank B, and the length from the inlet 2 of the water tank B' to the straightening roller D can be adjusted. This length adjustment is achieved by using an extruded outer jacket c
This is to ensure that the material is clamped by the correction roller D just before it solidifies.

As shown in FIGS. 2 and 3, the correction roller D is provided with a gap adjusting screw 5 between the sliding shaft 4 and the correction roller D at the bottom of the correction roller holding frame 3, and the roller base 6 is slidably and screwed together. It matches. One end of the gap adjustment screw 5 protrudes outside the holding frame 3, and a sprocket 7 is fitted onto it, a chain 8 is hung on the sprocket 7, and the sprocket 7 is fitted onto a handle shaft 9 provided on the upper part of the holding frame 3. It is wrapped around sprocket 10.

The correction roller D is made to match the outer shape after the outer cover c is molded, and the roller shaft 11 is
The cable P is provided on the roller base 6 so as to be shifted back and forth in the running direction of the cable P. If they are shifted in this way, the correction effect will be greater than if they were faced head-on.

As described above, the holding frame 3 with the straightening roller D set therein is placed in the water tank B, and the extruded SS cable P is held between the straightening roller D by turning the handle.
In this case, the clamping position is immediately before solidification of the extruded jacket, which does not cause settling and has a correction effect, and the adjustment is performed by expanding and contracting the accordion type auxiliary water tank B'.

〔Effect of the invention〕

The present invention is constructed as described above, and the cable can be held and straightened by the straightening rollers immediately before the outer sheath hardens, so that twisting does not occur between the support wire part and the cable core part. good SS
You can get the cable.

[Brief explanation of drawings]

Fig. 1 is a schematic partially cutaway plan view of an embodiment of an extrusion molding apparatus according to the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a cross section taken along line X-X of Fig. 2. Figure, 4th
The figure is a perspective view of the SS cable, and FIG. 5 is an explanatory diagram of the twisting of the SS cable. P... Cable with support wire, A... Extrusion molding machine,
B...Cooling water tank, B'...Auxiliary water tank, D...Correcting roller, a...Support wire, b...Cable core, c
...Outer cover, 2...Aquarium entrance.

Claims (1)

[Scope of Claims] 1. A cooling water tank is provided downstream of an extrusion molding machine in which a support wire and a cable core are supplied in parallel and integrally forms an outer sheath on both, and a cooling water tank through which the cable passes under water, In this extrusion molding apparatus for cables with support wires, which is provided with a straightening roller for clamping the cable in the water tank, the distance between the entrance of the cable to the cooling water tank and the straightening roller can be adjusted. Extrusion molding equipment for wired cables. 2. The cable with a support wire according to claim 1, characterized in that the cooling water tank portion between the inlet and the straightening roller has an expandable structure, so that the distance between the cooling water tank inlet and the straightening roller can be adjusted. Extrusion molding equipment. 3. The extrusion molding apparatus for a cable with support wire according to claim 2, wherein the cooling water tank portion is of an accordion type. 4. The extrusion molding of the cable with support wire according to claim 1, characterized in that the straightening roller is movable back and forth in the cable running direction so that the distance between the cooling water tank inlet and the straightening roller can be adjusted. Device. 5. The extrusion molding apparatus for a cable with support wire according to any one of claims 1 to 4, characterized in that the clamping force of the correction roller can be adjusted from outside the cooling water tank.