JPH0257008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a reinforced hose manufacturing apparatus that can continuously form an inner tube, a spiral reinforcing layer, and an outer tube substantially simultaneously. This is a reinforced hose manufacturing apparatus that is particularly suitable when adhesive treated yarn with adhesive is used as the reinforcing yarn.

<Prior Art> The applicant of the present application has previously proposed an apparatus for manufacturing a reinforced hose as described below in Japanese Patent Application No. 112829/1982 (see Japanese Patent Application Laid-Open No. 14723/1982).

As shown in FIGS. 3 to 6, a torpedo 3 is formed by protruding from the tip of the inner tube die 2 of the inner tube extruder 1, and the outer tube extruder 11 is connected to the intermediate die 12 and the outer tube die 13. The material outflow port 14 formed by
It is arranged so that it can be led out from the gap between the inner tube A and the inner tube die 2 and driven onto the inner tube A immediately after extrusion.

Here, in the inner tube extruder 1, the torpedo 3
is attached to an extrusion head 5 attached to the tip of the extrusion barrel 4, and the inner pipe die 2 is attached to the extrusion head 5. In the outer tube extruder 11,
The intermediate die 12 and the outer tube die 13 are connected to the extrusion barrel 2
The die presses 17 and 18 are attached to the extrusion head 16 attached to the extrusion head 16, respectively.
Further, the spiral device 21 is composed of an inner bobbin carrier 22 and an outer bobbin carrier 23 that rotate in opposite directions, and each bobbin carrier has reinforcing threads F1 and F.
12 bobbins 24 each are provided so that 2 can be derived.

In the apparatus having the above configuration, the inner spinner 25 and the outer spinner 26 each have a truncated conical shape,
It is attached via bearings 27 to the extrusion head 5 of the inner tube extruder and the extrusion head 16 of the outer tube extruder, respectively. At this time, each spinner 25, 2
Twelve thread holes G are formed at equal pitches in the circumferential direction at the distal end of each thread 6, and the thread holes G are inserted between the intermediate die 12 and the inner tube die 2. Also,
The base of each spinner 25, 26 is attached to an inner bobbin carrier 22 and an outer bobbin carrier 23, respectively.
The drive arms 28 and 29 are connected to each other through shafts 30 and 31 and spinner arms 32 and 33, and are rotatable together with the respective bobbin carriers 22 and 23.

<Problems to be Solved by the Invention> In the above-mentioned reinforced hose manufacturing apparatus, when an adhesive-treated thread having adhesiveness is used as the reinforcing thread,
Disturbance occurs in the circumferential pitch of the inner and outer reinforcing yarns, making it difficult to obtain a desired spiral yarn stitch, and the problem tends to occur that the take-up tension of the yarn becomes high.

As a result of our investigation into the cause of this problem, we found that the main cause was the adhesion of adhesive to the introduction walls of the inner pipe die due to each reinforcing yarn treated with adhesive. I gained knowledge.

That is, the distance from the thread hole G of 25 to the tip of the inner tube die 2 is long (usually 50 to 100 mm), and the inner reinforcing yarn F1 slides on the introduction surface of the inner tube die 2 in surface contact (in the circumferential direction). In order to run, the adhesive passes through the inner tube die 2.
It easily adhered to the outer surface. In the case of the reinforcing thread F2, as in the case of the inner reinforcing thread, since it slides on the introduction wall surface of the outer tube die 12 in surface contact, the adhesive easily adheres to the introduction wall surface of the outer tube die 12. Ta.
Adhesion of the adhesive to the yarn introduction walls of the inner tube die 2 and the outer tube die 12 increases the slip resistance of the inner and outer reinforcing yarns, causing the above-mentioned problem. The reinforcing threads F1 and F2 slide on the outer or inner truncated conical surfaces of the spinners 25 and 26, but since the spinners 25 and 26 can rotate integrally with the bobbin carriers 22 and 23, the inner and outer dies are There is no sliding in the circumferential direction as on the introduction surface, but there is sliding in a linear contact manner, so even if the adhesive adheres, the increase in sliding resistance is small.

<Means for Solving the Problems> In the reinforced hose manufacturing apparatus of the present invention, the torpedo of the inner tube extruder is formed to protrude from the tip of the inner tube die, and the outer tube extruder is formed to protrude from the tip of the inner tube die. The outer tube material outlet formed by the intermediate die and the outer tube die is arranged so as to be located close to the inner tube die and outside the outer periphery of the protrusion of the torpedo, and further, the spiral device is disposed between the inner bobbin carrier and the outer tube die. an inner spinner and an outer spinner each having a frustoconical shape and having a plurality of thread holes at a predetermined pitch in the circumferential direction at a distal end thereof which are mounted so as to be rotatable together with the bobbin carrier, and which are inserted between the intermediate die and the inner tube die; ,
In the structure in which the reinforcing thread can be led out from the gap between the intermediate die and the inner tube die and driven onto the inner tube immediately after extrusion, the extrusion head of the outer tube extruder is connected to the outer tube material flow. The tip of the inner spinner is moved forward from the exit position, the tip of the inner spinner is brought close to the tip of the inner tube die, and the truncated conical part of the outer spinner is brought close along the wall surface of the extrusion head. The above-mentioned problem is solved by bringing the tip close to the outer wall surface of the tip of the intermediate die and bending it toward the center axis of the torpedo.

<Examples> Hereinafter, this invention will be described in detail based on Examples.

The same parts as in the conventional example are given the same reference numerals and the explanation will be omitted.

In the conventional example shown in FIGS. 5 and 6,
As shown in FIGS. 1 and 2, the extrusion head 16A of the outer tube extruder 11 is offset forward from the position of the outer tube material outlet 14. That is, extrusion head 1
The axis of 6A and the (center) axis of the outer tubing outlet 14 are parallel, but the latter is offset a distance forwardly with respect to the former. This offset amount l is usually 15 to 30 mm. Along with this, the intermediate part of the intermediate die 12A is shaped to face rearward, and is extended to the rear of the outer tube die 13A, so that the outer tube material outlet 1
A material flow path 15 is formed toward the rear and communicates with the material flow path 4 . The material flow path 15 is curved just in front of the outer tube material outlet 14 so that it faces forward.

Further, the tip of the inner spinner 25A is close to the tip of the inner tube die 2A. Further, the truncated conical part of the outer spinner 26A is arranged close to the wall surface of the extrusion head 16A, and the tip thereof is arranged close to the outer wall surface of the tip end of the intermediate die 12A and aligned with the central axis of the torpedo 3A. It is bent towards.
At this time, it is desirable to set the slope angle of the truncated conical surface of each spinner 25A, 26A so that the contact with the reinforcing threads F1, F2 is minimized.

Next, the manner of use of the above-mentioned reinforced hose manufacturing apparatus will be explained.

The inner tube material in the extrusion barrel of the inner tube extruder is extruded from an orifice 7 formed by a torpedo 3A and an inner tube die 2A to form an inner tube A. Immediately after this extrusion, a reinforcing layer B having a spiral structure is formed on the inner tube A by driving reinforcing threads F1 and F2 led out from each bobbin 24 of the spiral device, as shown in FIGS. At the same time, the outer tube material in the extrusion barrel of the outer tube extruder is
4 to form the outer tube C.

At this time, the reinforcing layer formation and the outer tube formation are performed on the torpedo 3A that is formed by protruding from the tip of the inner tube die 2A, so that the inner tube A is not crushed, and the inner tube A is placed on the inner tube A immediately after extrusion. Since the outer tube C is formed on the inner tube A and the outer tube C, the adhesion between the inner tube A and the outer tube C is also good.

In addition, as shown in FIGS. 3 to 4, the reinforcing yarn F drawn out from each bobbin 24 of the spiral device
1 and F2 are guided through the thread holes G and G of the inner spinner 25A and the outer spinner 26A, respectively, and then pass through the gap between the inner pipe die 2A and the intermediate die 12A to the inner thread. It is led out onto tube A. At this time, the distance from the tip of the inner spinner 25A, that is, the position of the thread hole G, to the tip of the inner tube die 2A is much shorter than in the past (usually 3 to 7 mm). As shown in the figure), when the rotation speed of the spiral device is high, the inner reinforcing thread F
1 does not come into contact with the introduction wall surface of the inner tube die 2A, and
Even when the rotational speed is low, if the reinforcing yarn is introduced in point contact with the tip of the inner tube die 2A, that is, without surface contact, and adhesive treated yarn with adhesiveness is used as the reinforcing yarn, the internal Adhesive rarely adheres to the tube die surface, and even if adhesive adheres, the increase in slip resistance of the reinforcing yarn is small. On the other hand, the outer reinforcing thread F2 also passes through the intermediate die 1 like the inner reinforcing thread F1.
It is introduced in point contact with only the tip of 2A. In addition, when there is a possibility that the outer reinforcing yarn F1 will come into surface contact with the intermediate die 12A, an annular protruding strip 19 is formed on the introduction wall surface of the intermediate die 12A as shown in the figure.

<Effects of the Invention> Since the reinforced hose manufacturing apparatus of the present invention has the above-described configuration, the inner reinforcing yarn and the outer reinforcing yarn drawn out from the inner spinner and the outer spinner are connected to the tips of the inner tube die and the outer tube die, respectively. It is brought out onto the inner tube in point contact with the inner tube. Therefore, even if the reinforcing yarn is an adhesive-treated yarn with adhesive properties, the adhesive hardly adheres to the introduction wall surface of the inner tube die or outer tube die, and there is no increase in the slip resistance of the yarn in the circumferential direction. small. Therefore, a desired spiral yarn can be easily obtained with almost no disturbance in the circumferential pitch of the yarn, and the take-off tension of the yarn hardly increases.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view of essential parts of an example of the reinforced hose manufacturing apparatus of the present invention, Fig. 2 is an enlarged half sectional view of the material extrusion part in Fig. 1, and Fig. 3 is the overall layout of the reinforced hose manufacturing apparatus. A plan view, FIG. 4 is a bobbin carrier layout diagram of a spiral device, FIG. 5 is a plan sectional view of the main part of a conventional reinforced hose manufacturing device, and FIG. 6 is an enlarged half sectional view of the material extrusion part in FIG. 5. . 1...Inner tube extruder, 2,2A...Inner tube die,
3,3A...Torpedo, 11...Outer tube extruder,
12, 12A... Intermediate die, 13, 13A... Outer tube die, 14... Material outlet, 15... Material flow path, 16, 16A... Extrusion head, 21... Spiral device, 25, 25A... Inner spinner, 2
6,26A...Outer spinner, A...Inner tube, B...
...Reinforcement layer, C...Outer tube, F1...Inner reinforcement thread, F2
...Outer reinforcing thread, G...thread hole.

Claims (1)

[Scope of Claims] 1. An inner tube extruder, an outer tube extruder equipped with a head that crosses the axis of the inner tube extruder, and a spiral device having the same axis as the inner tube extruder. The torpedo of the inner tube extruder is formed to protrude from the tip of the inner tube die, and the outer tube extruder has an outer tube material outlet formed by the intermediate die and the outer tube die. are arranged so as to be close to the inner tube die and located outside the outer periphery of the protruding portion of the torpedo, and further, the spiral device is mounted so as to be rotatable together with the inner bobbin carrier, and the intermediate die An inner spinner and an outer spinner each having a truncated cone shape and having a plurality of thread holes at a predetermined pitch in the circumferential direction are inserted between the inner tube die and the inner tube die. In the reinforcing hose manufacturing apparatus, the reinforcing hose is arranged such that it can be led out and driven into the inner pipe immediately after extrusion through a gap between the outer pipe extruder and the inner pipe die, the extrusion head of the outer pipe extruder and the outer pipe material outlet. At the same time, the tip of the inner spinner is brought close to the tip of the inner tube die so that the inner reinforcing yarn does not come into line contact with the tip of the inner tube die, and further, the truncated conical portion of the outer spinner The tip of the outer spinner is placed close to the outer wall surface of the tip of the intermediate die so that the outer reinforcing yarn does not come into line contact with the tip of the intermediate die, and A reinforced hose manufacturing device characterized by being bent toward the central axis.