JPH04201545A - Heating core in continuous producing device for pressure resistant tube - Google Patents

Abstract

PURPOSE:To shorten vulcanization time by heating simultaneously from inside and outside of a rubber hose in vulcanizing and forming by a method in which at least a part of a core is made into double cylinders, and a heating part is formed in the gap between said double cylinders, and then the heat medium- flowing path which communicates with the heating part from a hot medium inlet and a hot medium outlet, is provided. CONSTITUTION:The core 1 on which a green rubber tape is wound, is arranged in the heating tube for vulcanization. Then, the core 1 itself is made into double cylinders 10, 11, and heating part 12 is formed in the gap between said cylinders 10, 11. Further, the hot medium-flowing path 15 which communicates with said heating part 12 from a hot medium-inlet 13 and a hot medium-outlet 14, is provided. The hot medium is fed to the heating part 12 through the hot medium- flowing path 15 from said inlet 13, and the core 1 is heated through said hot medium. Consequently the green rubber tape wound on the core 1 is heated simultaneously from inside and outside, and vulcanizing and forming are achieved in short time, whereby a pressure resistant rubber hose is continuously produced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves wrapping a raw rubber tape reinforced with a cord around a core metal and heating it while continuously extruding it to create a pressure-resistant rubber hose,
The present invention relates to the structure of a core metal having a heating section for continuous vulcanization molding.

[Conventional technology]

Conventionally, in order to manufacture pressure-resistant rubber hoses with a relatively large diameter of several am or more, a rubber lining tape was wound spirally around a steel pipe of a certain length, and a raw rubber tape reinforced with fiber cord was then spirally wrapped around the steel pipe. After wrapping the steel pipe in multiple layers in a shape, and then wrapping temporary tape in a spiral shape to tighten the multiple layers of rubber tape, the steel pipe is passed through a vulcanization furnace to vulcanize the rubber. It is manufactured by extracting a molded rubber hose from a steel pipe.

[Problem to be solved by the invention]

According to the conventional method for manufacturing a pressure-resistant rubber hose, it is only possible to manufacture a rubber hose of a certain length that is approximately equal to the length of the steel pipe serving as the core metal, and it is not possible to manufacture a long pressure-resistant rubber hose. The steps of wrapping rubber tape around steel pipes, vulcanizing them, and removing them are repeated processes, making continuous work impossible and resulting in low work efficiency. In addition, the heating in the vulcanization process is heated from the outside of the steel pipe around which the rubber tape and the temporary fastening tape are wrapped, so thick pressure-resistant rubber hoses have drawbacks such as requiring a long vulcanization time.

Accordingly, an object of the present invention is to provide a core metal for manufacturing pressure-resistant rubber hoses that can continuously manufacture pressure-resistant rubber hoses and shorten the vulcanization time.

[Failure to solve the problem]

In order to achieve the above object, the present inventors conducted extensive research and found that a large number of smooth conveyor tapes were installed along the axial direction of the tubular core around the entire surface of the core, starting from the surface of the core to the core. The raw rubber tape is arranged in an endless manner around the inside of the brass tube, and raw raw rubber tape is spirally wound on top of this conveyor tape. It is possible to continuously manufacture a long pressure-resistant rubber bow by continuously sliding and moving it while heating and vulcanizing it, and the core metal wrapped with this raw rubber tape is heated for vulcanization. In addition to placing the metal core inside the tube, the core metal itself is used as a double pipe structure 1, and by passing a heating medium between the double tubes and heating it, the rubber tape wrapped around the core metal is simultaneously heated from the inside and outside, and is vulcanized in a short time. The present inventors have discovered that the rubber hose can be molded and the manufacturing efficiency of rubber hoses can be increased, and the present invention has been completed.

That is, the present invention provides a substantially cylindrical pressure-resistant rubber hose manufacturing apparatus in which a lining rubber tape, a plurality of rubber-covered reinforcing cord tapes, and other reinforcing members as needed are wall-layered and wound around a core bar, heated, and vulcanized. A plurality of guide holes for conveyor tape insertion are arranged at equal intervals along the circumferential direction in the vicinity of the proximal end and the distal end of the core, and the guide holes in the proximal end and the It has an endless conveyor tape that passes through the guide hole at the tip and is disposed along the outside and inside of the cylindrical core metal and continues in an annular shape, and at least a part of the core metal is made of a double cylinder and the double cylinder The gist of the present invention is a heating core metal for a pressure-resistant rubber hose continuous manufacturing apparatus, characterized in that the gap forms a heating section, and a heating medium flow path leading from a heating medium port and a heating medium outlet to the heating section is provided.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a partial sectional view of an example of the core metal of the present invention, Figure 2 is a front view of the same, Figures 3 to 11 are sectional views of the same, and Figure 12 is continuous production of a pressure-resistant rubber hose using the core metal of the present invention. 1 is a schematic plan view of an example of a device.

The core metal [1] of the present invention has a substantially cylindrical shape as a whole, and the base end (
2) is fixed to a pedestal (3) and supported horizontally. Tip part (4) and base end part (2) of core metal (1)
Nearby, two rows of guide holes through which the conveyor tape is inserted are provided along the circumference. As will be described later, this guide hole is a guide hole through which a slippery endless conveyor tape is inserted to circulate and move excrement.

Of the two rows of guide holes in the tip (4) of the core bar (1), the tip outer running tape guide holes (5) are arranged in a ring at a position closer to the tip, and the tip is arranged in a ring in parallel thereto. The inner side running tape guide holes (6) are shifted from each other, that is, the inner side running tape guide holes (6) are located at positions corresponding to the gaps of the outer side running tape guide holes (5).
6) is located. Each row has multiple guide holes (first
In the example shown in the figure, 8 pieces) are provided radially penetrating the core bar (1) at equal intervals. Tip outer running tape guide hole (
5) may be in the form of a groove cut from the tip of the core bar (1) instead of being a through hole.

There are also proximal outer running tape guide holes (7) and proximal inner running tape guide holes (8) near the base end B (2) of the core bar (1).
Of the eight guide holes, five base end outer running tape guide holes (7) and four base end inner running tape guide holes (7) are arranged in parallel.
8) are arranged in a mutually parallel arc shape near the base end of the core bar (1), and the remaining three base end outer running tape guide holes (7) and four base end inner running tape guide holes Tape guide hole (
8) are arranged in parallel arcs at positions slightly shifted toward the tip of the core bar (1). As will be described later, the guide hole at the base end is arranged to provide an inlet/outlet for supplying a heat medium to the heating section in the core metal (1) without hindering the running of the conveyor tape.

A conveyor tape (9) having a width approximately equal to the width of the guide hole is sequentially inserted into each guide hole near the tip end (4) and base end (2) of the core bar (1). That is, the conveyor tape (9) passes through the proximal outer running tape guide hole (7a) from the inside to the outside, then passes along the surface of the core bar (1), and passes through the tip outer running tape guide hole (5a) to the outside. , and then return along the inner surface of the core bar (1) and insert the base end inner running tape guide hole (8a), the tip inner running tape guide hole (6a), and the base end outer running tape guide hole ( 7b)
, distal end outer running tape guide hole (5b), base end inner running tape guide hole (8b), distal end inner running tape guide hole (6b), base end outer running tape guide hole (7c)
), the tip outer running tape guide hole (5C), the base end inner running tape guide hole (8C), and the tip inner running tape guide hole (6C). The end of the tape (9) is joined to the tip of the conveyor tape (9) to form one endless annular tape.

The tape runs from the proximal outer tape guide hole (7) to the distal outer tape guide hole (5) from the proximal inner tape guide hole (8) adjacent to the proximal inner tape guide hole (8) to the distal inner tape guide hole. (6) is placed on the outside of the tape so that the -° portions of its width overlap each other, and the outside and inside surfaces of the cylindrical core metal (1) are connected to its tip B (4) and base end ( 2) The entire surface, except for a very small portion, is covered with a conveyor tape (9) extending in the axial direction.

Instead of making the entire conveyor tape (9) into one annular endless tape as described above, each base end outer running tape guide hole (7) and the distal end outer running tape guide hole (5) are arranged at opposing positions. Alternatively, the conveyor tape (9) passing through only the inner running tape guide hole (8) at the base end and the inner running tape guide hole (6) at the distal end can be made into an independent annular endless tape, but If it is made into one annular endless tape, the tension of the entire conveyor tape (9) is averaged, and there is no risk of excessive load being applied to a part of the conveyor tape (9) and premature wear and damage.

The conveyor tape (9) is a slippery tape with a small surface friction coefficient and low sliding resistance with the surface of the core bar (1), and has low surface energy and adheres to the surface under pressure. A heat-resistant tape with excellent strength and vulcanization-molded rubber with good releasability is used. For example, a fluororesin tape reinforced with an embedded aromatic polyamide fiber cloth is preferably used.

A portion of a certain length inside the core bar (1) at least close to the tip (4) has a double tube structure consisting of an inner tube σ1 and an outer tube αυ, and between the inner tube α [and the outer tube 01] A heating medium such as steam is passed through the annular gap to form the heating section side. Heat medium population α and heat medium outlet Q41 provided at the base end (2) of the core bar (1)
There are two heating medium flow paths leading from the heating section to the heating section side.

The heat medium flow path 0 $ is an axial direction extending from the heat medium inlet U and the heat medium outlet α in the axial direction of the core metal (1) via arc-shaped flow paths (G) along the circumferential direction of the core metal (1), respectively. It passes through the flow path α and communicates with the heating section 0. In the example shown in FIGS. 3 to 8, for convenience of processing and assembling the core metal (1), the axial flow path aV is separated into two stages, with an arcuate flow path α0 sandwiched between them. .

By providing the heating medium flow path (■) as described above, the heating medium population α and the heating medium outlet 0C are placed in a position that does not interfere with the running of the conveyor tape (9), and the heating medium flow path (G) is connected to the core metal. (1) can be placed between two pieces of conveyor tape (9) moving along the outer and inner surfaces of (1).

[Effect]

In order to manufacture a pressure-resistant rubber hose using the core metal (1) of the present invention in a pressure-resistant rubber hose continuous manufacturing apparatus, as shown in FIG. Directly wrap the lining rubber tape α■ directly on top of (9) using the inner rubber servicer QIID so that there are no gaps. The lining rubber tape α9 may be wound spirally, or may be wound vertically so that one seam is formed in the axial direction.

Lining rubber tape a! For D, it is preferable to wrap a raw rubber sheet and a vulcanized rubber sheet laminated together with the raw rubber side facing outward.

Place the lining rubber tape side wrapped around the conveyor tape (9) on the core metal (1) together with the conveyor tape (9) on the core metal (1).
) toward the tip (4) and slide the mesh servicer (a) on the core bar (1) in the axial direction.
Wrap the rubberized mesh tape■ in a spiral. Furthermore, a reinforcing wire is spirally wound on top of it using a wire servicer (c). Rubber mesh tape and reinforcing wire may be omitted depending on the case.

Code servicer a! above the reinforcing wire @! Mu,
From (c), the reinforcing cord tapes (1) and (c) are wound in a plurality of helical directions while changing the helical direction. Reinforced cord tape is a tape in which reinforcing fiber cords are arranged in the longitudinal direction of the tape and made into a blind weave in the width direction of the tape and coated with raw rubber.

A temporary tightening tape (■) is further spirally wound around the outside of the reinforcing cord tape, and each layer is pressurized from the outside. In this state, the entire winding layer is slid together with the conveyor tape (9) on the core metal (1) in its axial direction, and passed through the vulcanization heat-retaining tube (to). It is heated from the outside under the vulcanization temperature conditions, and at the same time the core metal (1)
A heating medium such as steam is passed through the heating part 0 inside the core metal (1
) Also heat from the inside of the upper layer. 130-170℃, preferably 140-155℃ by simultaneous heating from inside and outside
It is quickly heated to a vulcanization temperature of °C and vulcanized.

It is preferable that the heating range by the heating section is from slightly before the entrance of the vulcanization heat retention tube (c) to the outlet of the vulcanization heat retention tube (c).

The vulcanized pressure-resistant rubber hose that has exited the vulcanized heat-retaining tube (c) is pulled out by a take-up machine (to) which conveys the hose while being clamped by a plurality of belt conveyors. The tip (4) of the core bar (1) extends to the take-up machine (to), and the conveyor tape (9) that has moved together with the rubber hose extends to the tip (4) of the core bar (1). It is peeled off from the lining rubber on the inner surface of the pressure-resistant rubber hose vulcanized at the tip (4) of the core (1) and returns to the base end (2) through the cylindrical interior of the core (1).

The temporary tightening tape (c) is removed from the vulcanized rubber hose pulled out by the take-up machine (to) to form a product.

In the manufacturing process of the above-mentioned pressure-resistant rubber hose, the layer wound on the core bar (1) is pulled by the take-up machine (■) and slides and moves toward the tip of the core bar (1) together with the conveyor tape (9). , the conveyor tape (9) itself is not given any driving force from the inside, but the conveyor tape (9) and the core metal (1)
) The frictional force between the surfaces is small, so that even if the core bar (1) remains clamped by the winding layer from the outside with a large pressure, it can slide relatively lightly on the surface of the core bar (1) together with the outer winding layer.

7 Effects of the invention: - According to the heating core metal of the pressure-resistant rubber hose continuous manufacturing device of this invention, pressure-resistant rubber hoses can be manufactured continuously, and even long pressure-resistant rubber hoses can be freely manufactured as needed. I can do it. The laminated rubber sheet and reinforcing cord layer can be vulcanized and molded while being tightened under high pressure, and a rubber hose with excellent pressure resistance can be manufactured.

During vulcanization molding, the rubber hose can be heated from the inside and outside at the same time, reducing vulcanization time and increasing manufacturing efficiency. In addition, the entire layer of the laminated rubber hose is vulcanized at uniform vulcanization temperature conditions both inside and outside, and the entire layer can be vulcanized and molded under optimal vulcanization conditions, making it possible to obtain a product of excellent quality.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of an example of the core metal of the present invention, Fig. 2 is a front view of the same, Fig. 3 is an enlarged AA sectional view of the same, Fig. 4 is a CC sectional view of the same, and Fig. 5 is a cross-sectional view of the same CC. sectional view, Figure 6 is the same CC sectional view,
Fig. 7 is a sectional view of the FF, Fig. 8 is a sectional view of the FF, Fig. 9 is a sectional view of the CC, Fig. 1O is a sectional view of the CC, Fig. ml1 is a sectional view of the CC, and Fig. 12 is a sectional view of the invention. 1 is a schematic plan view of an example of a pressure-resistant rubber hose continuous manufacturing apparatus using a core metal of FIG. (1) Core bar, (2) Base end, (3) Mounting frame, (4) Tip end, (5) Tip outer running tape guide hole, (6) Tip inner running tape guide hole, (7) Base End ° outer running tape guide hole, (8) proximal end inner running tape guide hole, (9) conveyor tape, αO inner tube, αυ outer tube, 0 heating section,
03 Heat medium inlet, 0 heat medium outlet, QSI
Heat medium flow path, 00 Arc-shaped flow path, α force axial flow path, αS Inner rubber servicer, a lining rubber tape, (a) Mesh service, ■ Rubber mesh tape, ■ Reinforcement wire, @ Wire servicer , ■, (c) Cord servicer, (c), (c) Reinforced cord tape, (to) Temporary tightening tape, ■ Vulcanized heat-retaining tube, (to) take-up machine. Patent applicant: Toyo Rubber Industries Co., Ltd. Agent: Yoshiyuki Koyama, patent attorney Figure 8 Figure 7! Figure O Figure ff

Claims (1)

[Claims] (1) Approximately cylindrical core metal for a pressure-resistant rubber hose manufacturing device that laminates a lining rubber tape, multiple rubber-covered reinforcing cord tapes, and other reinforcing members as necessary on a core metal, wraps them, heats them, and vulcanizes them. A plurality of guide holes for conveyor tape insertion are arranged at equal intervals along the circumferential direction near the base end and at the distal end of the core metal, and the guide holes at the base end and the guide holes at the distal end are arranged at equal intervals. It has an endless conveyor tape that passes through the hole and is disposed along the outside and inside of the cylindrical core metal and continues in an annular shape, and at least a part of the core metal is made of a double cylinder, and the gap between the double cylinders is 1. A heating core metal for a pressure-resistant rubber hose continuous manufacturing apparatus, characterized in that it forms a heating section and includes a heating medium flow path leading to the heating section from a heating medium inlet and a heating medium outlet.