JPS6228223A - Manufacture of reinforced hose and device thereof - Google Patents

Abstract

PURPOSE:To efficiently manufacture a pressure hose, between the inner tube and the outer tube of which no slippage develops, and the adhesive properties between the reinforcing layer of which are improved, by a method wherein the inner tube is formed by extrusion onto a mandrel and, at the same time and the reinforcing layer is made and the outer tube is formed by extrusion at the same position. CONSTITUTION:An inner tube A is formed by extruding inner tube material in the extruder barrel 15 of an inner tube extruder through an inner tube orifice 13 formed by a flexible mandrel 12 and an inner tube die 18. Nearly at the same time, a braided reinforcing layer B is formed of braiding reinforcing materials F and F which have delivered from bobbins 53a and 54a in a manner of crossing through an annular gap G, which is formed by an inner tube die 18 and an intermediate die 39, onto the inner tube A. In succession and nearly at the same time, an outer tube C is formed by extruding outer tube material in the extruder barrel 35 of an outer tube extruder through an outer tube orifice 33, which is formed by the intermediate die 39 and an outer tube die 40, onto the braided reinforcing layer B.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method and apparatus for manufacturing a reinforced hose, and in particular,
This method and apparatus are suitable for manufacturing high and medium pressure hoses such as brake hoses and water hoses that require pressure resistance.

<Prior Art> In general, a high-pressure port (reinforced hose) H such as an air brake hose has a structure consisting of an inner pipe A, a braided reinforcing layer B, and an outer pipe C, as shown in Fig. 3. The manufacturing method was, for example, as shown in FIG.

First, as shown in FIG. 4I, the inner tube A is extruded onto the flexible mandrel 3 that is fed out from the round mold 2 using the inner tube extrusion @1, and after being conveyed on the cooling conveyor 4, the inner tube A is 5
A braided reinforcing layer B is formed on the inner tube A, passed through an adhesive tank 6 and a dryer 7, and wound onto a reel 8.
As shown in Figure H, the braided reinforcing layer B is
An unvulcanized reinforced hose H was obtained by extruding the outer tube C onto the top. This unvulcanized reinforced hose H is cut into predetermined lengths, placed on the pallet 10 in a thinly wound shape, and then vulcanized using a vulcanizing can (not shown). They extracted it and used it as a product.

<Problems to be solved by the invention> Since the above braiding is performed on the soft uncured inner tube A,
At -1 o'clock, the inner tube A was stretched and stretched, and rubber accumulations (bumps) as shown in FIG. 5 were likely to occur. This rubber stagnation is undesirable because it makes the wall thickness of the inner tube A non-uniform and deteriorates the product performance. Therefore, Japanese Patent Publication No. 51-20232 discloses a method in which a freezing box is placed immediately before the braiding machine, and an inner tube containing a mandrel is passed through the freezing box to partially cool and harden the braiding. However, it is not practical as it requires a freezing box and moisture condenses and reduces the adhesion to the yarn.

For this reason, in reality, it was necessary to strictly control the tension of the braid to prevent the inner tube from elongating.

Also, during the extrusion of the outer tube described in -1-, the inner tube A on the mandrel 3 installed inside was stretched in the conveying direction by the extrusion pressure via the set reinforcing layer B, and again, as shown in FIG. Rubber build-up was likely to occur as shown in the figure. For this reason, it was still necessary to strictly control the extrusion speed of the outer tube so that it became the same conveyance speed as that of the mandrel and the inner tube. In addition, 10 is an orifice for outer tubes.

Means for Solving the Problems> The present invention has been developed as a result of intensive development efforts to solve the above problems.
The present invention was completed by focusing on the reinforced hose manufacturing method and apparatus proposed in Publication i4723 and the like.

That is, the method for manufacturing a reinforced hose of the present invention includes extruding an inner tube onto a flexible mandrel, forming a reinforcing layer on the inner tube,
When manufacturing a reinforced hose by extruding an outer tube onto the reinforcing layer, extruding the inner tube, forming the reinforcing layer, and extruding the outer tube are performed at approximately the same position on the flexible mandrel and at approximately the same time. The reinforcing hose manufacturing apparatus of the present invention is characterized in that the reinforcing hose manufacturing apparatus of the present invention has an orifice for an inner tube formed by a flexible mandrel and an inner tube die that are continuously drawn out from the center of the torpedo. an outer tube extruder equipped with an outer tube orifice located concentrically close to the front surface of the inner tube orifice and formed by an intermediate die and an outer tube die; a reinforcing layer forming machine disposed coaxially with the inner tube extruder so that the reinforcing layer forming material can be drawn out onto the inner tube immediately after extrusion from an annular gap formed between the die and the inner tube die; It is characterized by consisting of.

The reinforced hose manufacturing method and apparatus described in the above-mentioned publication are characterized in that the reinforcing layer and the outer tube can be formed without using a mandrel.

<Example> Hereinafter, the method and apparatus of the present invention will be explained in detail.

The apparatus consists of an inner tube extruder 11, an outer tube extruder 31, and a braiding machine 51, as shown in FIGS. At this time, the inner tube extruder 11 is usually installed on a slide base (not shown), and the annular gap formed by the inner tube die and the intermediate die, which will be described later, can be adjusted. And the braiding machine 51,
Immediately after extruding the inner tube, the outer tube extruder 31 sets a point -1 and a point so that a set of outer tubes can be extruded simultaneously and continuously at the extrusion site, that is, at the same position on the flexible mandrel 12. The outer tube orifice 33 is disposed close to and concentrically with the front surface of the inner tube orifice 13.

That is, the extrusion head 16 is fixed to the extrusion barrel 15 in which the screw 14 of the inner tube extruder 11 is installed by means such as screwing, and the extrusion head 16 has a torpedo 17.
Furthermore, the inner tube die 18 is fixed. Inner tube die 1
8 is fixed by means of a fixing ring nut (19). Further, the inner tube die 18 can be adjusted by a plurality of adjustment bolts 20 screwed into the extrusion head 16 radially toward the axis. Further, the torpedo 17 has a flexible mandrel 12 which can be ejected from the center, and an extrusion head 1
A mandrel feeding hole 22 is formed which communicates with the mandrel introducing hole 21 formed in 6. The diameter of this feeding hole 22 is reduced at the feeding portion. The inner tube orifice 13 is formed by a flexible mandrel 12 drawn out from a torpedo and an inner tube die 18. In addition,
Immediately before the mandrel introduction hole 21, a plurality of guide rolls 2
3 are arranged.

An extrusion head 36 consisting of a head ring 37 and a head flange 38 constituting a material flow path M is fixed to the extrusion barrel 35 in which the screw 34 of the outer tube extrusion fi 31 is installed. An intermediate die 39 is used for the head flange 38, and a die presser 41, 42 is used for the outer tube die 40, respectively, and the outer tube orifice 33 is formed by both dies 39,40. Further, the intermediate die 39 is screwed into the head ring body 37 radially toward the axis by a plurality of adjustment ports 43, and the outer tube die 40 is screwed into the head flange 38 radially toward the axis. Alignment is possible using a plurality of adjustment ports 44.

From the annular gap G formed by the outer edge of the tip of the inner tube die 18 of the inner tube extruder 11 and the inner outer edge of the intermediate die 39 of the outer tube extruder 31, the reinforcing material F is guided onto the inner tube A immediately after extrusion. A braiding machine 51 is arranged coaxially with the inner tube extruder 11 and, more precisely, with its extrusion barrel 15, so that the braiding is possible. The braiding machine 51 is equipped with bobbin carriers 53, 54 that rotate alternately in opposite directions on a drawing board 52.

A method for manufacturing a reinforced hose of the present invention using the above-mentioned apparatus will be explained.

The inner tube material in the extrusion barrel 15 of the inner tube extruder is extruded from the inner tube orifice 13 formed by the flexible mandrel 12 and the inner tube die 18 to form the inner tube A. At approximately the same time, bobbin carriers 53 and 54 in the braiding machine 51
The reinforcing materials F and F that are fed out from the pobbins 53a and 54a supported by the pobbins 53a and 54a are driven into the inner tube A through the annular gap G formed by the inner tube die 18 and the intermediate die 39, intersecting each other up and down, and are braided. A reinforcing layer B is formed. It should be noted that this annular gap G should be set to the minimum gap (1 to 3 cm) through which the reinforcing material F can pass as much as possible by sliding the inner tube extruder 11 when extruding the inner tube, braiding, and It is desirable that the outer tube be extruded simultaneously and in the same position. Subsequently, substantially simultaneously, the outer tube material in the extrusion barrel 35 of the outer tube extruder is extruded onto the braided reinforcing layer B through the outer tube orifice 33 formed by the intermediate die 39 and the outer tube die 40. A tube C is formed.

In the above, since the inner tube extrusion, braiding, and outer tube extrusion are performed almost simultaneously at the extrusion position of the inner tube A, that is, at approximately the same position of the mandrel 12'', the inner tube is extruded at -1 or when the outer tube is extruded. The tube does not stretch by itself, and there is no space between the mandrel and the inner tube, so the conventional example (
As shown in Figs. 5 and 6), the inner tube A does not stretch and bulge locally.

The unvulcanized reinforced hose H manufactured in this manner passes through the pressurized steam pipe 26, is pre-vulcanized, and then is conveyed to the take-up conveyor 2.
At step 7, the pieces are picked up, cut into pieces of predetermined length, arranged in a thin roll on a pallet 28, put into a vulcanizing can (not shown), and subjected to main vulcanization, after which the mandrel 12 is pulled out to form a product.

Although the above embodiment is an example in which one set of machines is used as the reinforcing layer forming machine, it is of course applicable to a spiral machine and the like.

<Effects of the Invention> Since the method and apparatus for manufacturing a reinforced hose of the present invention have the above-described method and configuration, the following effects can be achieved.

At the same time as the inner tube is extruded on the mandrel, the reinforcing layer is formed and the outer tube is extruded at the inner tube extrusion position, so the inner tube does not stretch by itself and no space is created between the mandrel and the inner tube. This prevents the inner tube from being squeezed and stretched over the mandrel and causing rubber buildup (bumps) in the inner tube.

Although this is not a unique effect of the present invention, since the extrusion of the inner tube, the formation of the reinforcing layer, and the extrusion of the outer tube are performed at approximately the same position and at the same time, the manufacturing speed of the hose is greatly improved, and
The extruded inner tube is immediately reinforced and the outer tube is coated while the inner tube is hot, improving the adhesion between the inner tube and the outer tube.

[Brief explanation of drawings]

FIG. 1 is a schematic end view showing an example of the reinforced hose manufacturing apparatus of the present invention, FIG. 2 is a conceptual process diagram in which a preliminary vulcanization process is combined with the reinforced hose manufacturing process of the present invention, and FIG. 3 is a diagram of the present invention. A partially cutaway cross-sectional view showing an example of a hose to which the invention is applied, Figure 4 is a manufacturing process diagram of a conventional reinforced hose, Figure 5 is a conceptual diagram of a rubber reservoir that occurs in the inner tube during braiding, Figure 6 11 is a conceptual half-sectional view of a rubber reservoir generated in the inner tube when extruding the outer tube. 11. Inner tube extruder. 12. Flexible mandrel. 13. Orifice for inner tube. 17. Torpedo. , 18... Inner tube die, 22... Mandrel feeding hole, 31... Outer tube extruder, 33... Orifice for outer tube, 39... Intermediate die, 40... Outer tube die, 51 ...-assembling machine (reinforcement layer forming machine), 52... drawing board, 53.54... bobbin carrier, A... inner tube, B...- assembly reinforcing layer, C... outside Pipe, H...Reinforced hose, F...Reinforcement material, G...Annular space. Patent applicant

Claims (1)

[Claims] 1. When manufacturing a reinforced hose by extruding an inner tube onto a flexible mandrel, forming a reinforcing layer on the inner tube, and extruding an outer tube on the reinforcing layer, , forming the reinforcing layer, and extruding the outer tube at substantially the same position on the flexible mandrel and substantially simultaneously. 2. An inner tube extruder equipped with an inner tube orifice formed by a flexible mandrel and an inner tube die that are continuously fed out from the center of the torpedo, and an inner tube extruder that is concentrically adjacent to the front surface of the inner tube orifice. An outer tube extruder is located at the outer tube, and is provided with an outer tube orifice formed by an intermediate die and an outer tube die. A reinforcing hose manufacturing apparatus comprising a reinforcing layer forming machine coaxially arranged with the inner tube extruder so as to be able to draw out a reinforcing layer forming material.