JPS59174336A - Manufacture of rubber hose - Google Patents

Abstract

PURPOSE:To perform vulcanization with good workability when a rubber hose stock is vulcanized with the stock covered with lead, by firmly pressing elongate lead films having a prescribed width each of which has bent flange sections on the opposite ends onto the circumferential surface of the stock, and welding the flange sections to cover the stock with the lead films. CONSTITUTION:An inner rubber 2 is fed to an extruder 3 and is covered with an outer rubber to produce a rubber hose stock 4. On the other hand, the lead films 13 that have been molded into an elongate shape with a prescribed width and have been provided with the bent flange sections 13a, 13a at the opposite ends are payed out from an unwinder 18, are abutted to the undersurface of the rubber hose stock 4 by a deflector roll 19, are fed into a roll molder 17 and are pressed firmly to be molded onto the outer circumferential surface of the rubber hose stock 4 by molding rolls 14, 15, 16. Then the lead films 13 and the rubber hose stock 6 are passed through a gradient guide 20, the opposite flanged sections 13a, 13a are abutted to each other and welded by a gas burner 21, then the obtained rubber hose stock 6 covered with the lead is fed to a vulcanizing apparatus 7, and after the vulcanization, the lead cover is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rubber hose (2).
r31 to the method for manufacturing rubber hoses that uses dilead and performs 7JIllWt! l'T.

A manufacturing method for manufacturing rubber hoses in which the outer periphery of an extruded rubber hose material is coated with lead, the shape of the rubber hose material is maintained by the lead coating, and the rubber is vulcanized by heating in a RWr state from outside air. is commonly practiced. FIG. 1 is a schematic diagram of an apparatus showing the conventional manufacturing process of such a rubber hose manufacturing method. An example of the conventional manufacturing process based on FIG. 1 is as follows.

In the figure, 1 is the uncoiler, from which the outer circumference ζ
The inner rubber 2 having two reinforcing layers is unwound and charged into the extruder 34. At this time, a mandrel may be inserted into the inner diameter portion of the inner rubber 2 depending on the required ζ2. Extruder 3 (The outer periphery of the inner rubber reinforcing layer is coated with the outer rubber, and the extruder 3
The rubber hose material 4 is extruded from the nozzle (die) with the required shape and dimensions. Next, the rubber hose composite material 4 is made by two lead-covering machines 5C, and molten lead that has been heated and melted in advance is applied to the outer rubber outer circumference (= applied, rapidly cooled to solidify the lead, and the outer circumference is coated with MI to the required thickness.) The material 6 is sent to a vulcanizer 7, which is shown as an in-line continuous unit in the figure, but with a separate off-line unit.
Sometimes a hot pot is used. For example, vulcanization treatment is 160
Heating is performed at ℃×30 minutes. The rubber hose material 6 that has passed the rubber vulcanization process is pulled out by a take-up machine 8, and the lead 10 is stripped off by a stripper 9, resulting in a finished rubber hose 1.
1 and is wound up on a winding machine 12. In addition, the metal used for coating (2) is not limited to lead, and the rubber vulcanization temperature (120 to 1
Any low melting point metal (for example, cadmium, blue lead, tin, etc.) having a melting point higher than 60° C.) may be used, but lead is usually used because of its ease of availability and handling.

The conventional manufacturing process is as described above, but this conventional method (
The second method involves melting lead (the melting point of lead is 327°C in the case of pure lead) and coating it on the rubber hose rope material, which requires high-temperature work and requires lead melting. There is a problem in that lead fumes are generated and the working environment is significantly deteriorated.Furthermore, the lead-covered machine that melts lead requires extremely expensive equipment costs, and the heat energy and heat required to melt lead are extremely high. The cost is also high.As described above, the conventional method for manufacturing rubber hoses using the lead coating method has many drawbacks, but no effective improvement method has been developed to date.

The present invention has been made with the intention of providing a method for manufacturing a rubber hose that can overcome the drawbacks of the conventional manufacturing methods as described above. In other words, the method of the present invention is a rubber hose manufacturing method in which the outer periphery of the rubber hose material is coated with lead and the rubber is vulcanized as described above. A lead film provided with a bent flange portion is crimped onto the outer peripheral surface of a rubber hose material using a roll (two rolls) so that the two flanges face each other, and the flanges are passed through a slope guide so that the two abut against each other. The gist is to weld and join (secondly, to perform lead coating).Hereinafter, the structure of the method of the present invention will be explained based on the embodiment shown in the drawings.

FIG. 2 is a schematic diagram of an apparatus showing one embodiment of the rubber hose manufacturing process according to the present invention. In this figure, the same reference numerals as in FIG. This shows the parts.

Method of the present invention (2) The inner rubber 2 is unwound from the unwinding device 1, passes through the extruder 3, is coated with the outer rubber, and is molded and extruded from the die of the extruder 3 as a rubber hose rope material 4. That is, the sickle is the same as in the conventional example. However, in the present invention, the lead coating machine 5 that heats and melts lead to deposit it is not used in the conventional example, and the lead coating machine 5 is not used in the prior art example, but the lead coating machine 5 is made to have a predetermined thickness and width. A roll forming machine 17 is used which press-forms a lead film 13 formed into a long strip shape having bending flanges on both sides onto the outer periphery m+ of a rubber hose material 4 using cold forming rolls 14, 15, and 16. It is.

18, a long strip of lead film is stored in a coil and detected.
This is a lead film unwinding machine.

Figure 3 shows a cross section of the lead film used in the present invention.

13a is provided. This bent flange portion 13a.

13a may be provided on the lead film 13 from the beginning, or may be made flat initially and then bent by roll forming or the like after being unwound. Pray for Franc L7 capitals [
It is preferable that the width of the lead film 13 after being removed is πd, as shown in the figure, where d is the outer diameter of the rubber hose cable 4. The lead film 13 is unwound from an unwinding machine 18, rolled together by a deflector roll 19, and brought into contact with the rubber hose material 4 from below. At this time, the flange portion 13a of the lead film 13.

13a faces downward. Next (the dilead film 13 and the rubber hose cable material 4 are rolled on cold-open forming rolls 14° and 15°.
16, the lead film 13 passes through the outer periphery of the rubber hose material 4 (the case with two turns is molded by pressure bonding. FIG.
3m and 13a are shown facing toward each other on the upper surface of the rubber hose material 4 (2).

Next (Ni-rubber hose composite 4 (2-coated lead film 13
passes through the slope guide 20, and both flange portions 13a,
13a is brought into contact. Figure 5 shows the slope guide 20
FIG. 3 is a perspective view showing the flange portions 13a, 13a being brought close to each other while passing through the slope slit portion 20a, and the opposing surfaces thereof coming into contact with each other. The flanges 13a, 13a brought into contact in this way are heated by a heating means such as a gas burner 21 (the rubber hose material 6, which has been melt-layered and coated with lead, is cooled if necessary and placed on a pinch roll 22).
(It is pulled out twice and sent to the vulcanizing device 7. The steps after the vulcanizing device 7 are the same as those in the conventional example. As shown in FIG. 6, the lead-coated rubber hose material is pinched from the slope guide 20. This is a perspective view showing the state of passing through the roll 22. The pinch roll 22a is provided with a notch 22b through which the stone-layered flange parts 13a of the lead film 13 can pass.

The method for manufacturing a rubber hose of the present invention is constructed as described above, and instead of using the conventional method of coating with molten lead, a rubber hose is preformed into a long shape with a required width and has bent flanges on both sides. Since the lead film with a section is temporarily attached to the rubber hose material using a cold molding roll and a slope guide, there is no need for the conventional high-temperature work of making lead sheets, and there is no possibility of generating lead fumes. The cropping environment has been significantly improved.Also, the high 111
There is no need for heavy equipment or equipment that requires forging, and there is no need for thermal energy to melt lead, making it possible to reduce the manufacturing cost of rubber hoses.

[Brief explanation of the drawing]

Fig. s1 is a schematic diagram of an apparatus showing an example of a conventional rubber hose manufacturing process, Fig. 2 is a schematic diagram of an apparatus showing an example of a rubber hose manufacturing process according to the present invention (second method), and Fig. 3 is a schematic diagram of an apparatus used in the method of the present invention. A cross-sectional view of the lead film, Figure 4 is a perspective view showing the lead film formed around the outer periphery of the rubber hose material, Figure 5 is a perspective view of the slope guide, and Figure 6 shows the rubber hose material passing from the slope guide to the pinch roll. It is a 1r perspective view showing the situation. 1... Unwinding device, 2... Inner rubber, 3... Extruder,
4... Rubber hose material, 5... Lead-covered machine, 6... Lead coated rubber hose material, 7... Vulcanizing device, 8... Taking machine, 9... Stripper, 10... Lead , 11...
Product rubber hose, 12... Winder, 13... Lead film, 14, 15° IB... Forming roll, 17...
Roll forming machine, 18...Lead film unwinding machine, 19...
・Deflector roll, 20...Gradient guide, 21・
...Gas burner, 22...pinch roll.

Claims (1)

[Claims] The outer periphery of the rubber hose material extruded from an extruder is coated with lead, vulcanized, and then the lead coating is peeled off to produce a product.Method for manufacturing a rubber hose≦2. Both side edges I: Folded flange section C. A roll of lead film (press-molded on the outer circumferential surface of the rubber hose material with two twists is made so that the two flange parts face each other, and the flange parts are passed through a slope guide to be attached to each other. A method for manufacturing a rubber hose, characterized in that when the parts are joined by welding with soil that is in contact with each other, a lead coating is applied from ζ2.