DE2329806A1 - METHOD AND DEVICE FOR TURNING THE INSIDE OF A FLEXIBLE HOSE OUTSIDE - Google Patents

Description

Ashimori Kogyo Kabushiki Kaisha
(Ashimori Industry Co., Ltd.)
Osaka / Japan

Method and apparatus for v / ending the inside of a flexible hose to the outside

Priority: June 12, 1972, Japan, No. 58447 July 25, 1972, Japan, No. 74341

The invention relates to a method for turning the inside of a flexible hose to the outside and a device for Implementation of the procedure.

Turning the inside of a flexible hose outwards, i.e. turning a flexible hose inside out, is particularly useful perform in the manufacture of flexible hoses, their inner and outer surfaces to simplify the manufacturing conditions are intentionally reversed.

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In the manufacture of hoses, e.g. B. fire hoses is it is already known that the outer surface of a textile jacket made of tubular woven or knitted threads coated with a film of rubber or a synthetic resin and then the outside coated dumbbell inside to make a hose with a rubber or synthetic resin liner. In the British U.S. Patent No. 957,929 is one method of manufacture of fire hoses described in which a hollow mandrel in an externally coated, flexible, tubular Dumbbell is inserted, one end of which is turned over into the mandrel and the turned over end of the jacket through the mandrel with Is pulled with the help of a wire, whereby the The coat is turned inside out over its full length. In this way of working, in which a flexible, hose-like jacket is brought into contact over its full length with the hollow mandrel, however, a considerable amount of force is required to get the jacket fully in contact with the mandrel to pull uniformly. In this case the jacket is advantageous thin and flexible when folded over a nose located at the end of the hollow mandrel, and he is pulled through this. However, if the jacket is stiff to some extent, its stiffness will cause between the turned-up portion and the non-turned-up portion on the nose, friction and interferes with uniform turning of the coat. When the moving jacket becomes obstructed, it causes

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Forced pulling of the jacket cracks, holes or similar damage. Therefore, the operation of this British patent has the disadvantage that it is only in an extremely thin, flexible, tubular jacket and with a strong pulling force. Furthermore this mode of operation has the disadvantage that the hollow mandrel

must be long enough so that it is approximately the same length as the one to be turned from the inside to the outside, has flexible, tubular jacket, and that it must have a solid structure, since the mandrel can withstand the strong tensile force must and can only be supported at one end. In addition, a number of mandrels of various sizes must be manufactured because the diameter of the dome changes when that of the flexible, hose-like jacket changes changes. Therefore, it is a great disadvantage that there are many different types of such long, heavy-weight, solid mandrels must be produced and that they are flexible according to the size of the inside to the outside to be turned over Hoses need to be replaced.

The object of the invention is to overcome the disadvantages described above to avoid and to create a method and a device that for a smooth or gentle turning over of a flexible hose can be applied from the inside to the outside without mechanical damage to the hose at the same time, where only a weak pulling force is required or the pressure

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a fluid can be used as a power source for the eversion

can. In this way it is possible to use a flexible hose
with a lining made of rubber or a synthetic resin

to provide uniform thickness that has no defects.

The object of the invention is achieved by a method for turning the inside of a flexible hose outwards, which is characterized in that a flexible hose is used
one of its ends is turned inside out, the end turned inside out is fastened to a holding device, the flexible hose at the turning point and in a section that extends from the turning point to the fastened end and already from turned inside out, on
an almost circular cross-section is inflated while a subsequent, non-inverted section of the flexible hose, which extends from the turning point to the other end, is compressed and the inside-out-turned section and the non-inverted section of the flexible hose along the axis moving away from the attached end
extends outwardly, sliding the turning point from the attached end to the other end over the full length of the hose.

If a flexible hose is turned inside out, a turning point should be in which a section of the everted tube and a section of the tube that has not yet been everted together are in contact, near one end of the

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Tube and lie over the full length

Hose to be moved to the other end thereof. because the everted section and the non-everted section of the hose each have the same diameter one of the sections forcibly inserted into the other. Therefore, the portion inserted to the inside forms inevitable Wrinkles and has an undulating wall on the circumference. At the turning point becomes a section with a smooth wall-on one

with

very short distance connected to a section / wavy wall, so that in this way an unnatural, distorting condition is created. If the turning point is in such a State is shifted, some friction is generated between the two sections, whereby the eversion is hindered.

In the method according to the invention, the shifting of the turning point smoothly or gently can be achieved without the outer coating of rubber or a synthetic resin in the Eversion is damaged by turning the hose at the turning point and in the previous one, already turned inside out Section, d. H. every outer section is inflated, while the following section, not yet turned inside out, d. H. the inner section is compressed. In this case, the space between the everted, outer tube and the non-everted, inner tube becomes enlarged and the externally coated, inner tube with a folded and wavy wall can be smooth from the inside to the outside on a

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specific, extended distance to be turned over to the round inflated, outer tube with the desired lining.

According to one embodiment of the method according to the invention the pressure of a fluid to inflate the hose at the turning point and in a preceding, everted section with compression of the hose in a subsequent, not everted section used. In this case it becomes a more flexible one Hose, usually in a coiled condition, placed in a confined pressure vessel, and one end of the hose is secured in the container while the other end extends to the outside of the container through a nozzle attached thereto can. A portion of the tube extending outside the container is everted and the end is attached to the attached to the outer surface of the nozzle. A fluid, e.g. B. Air or a liquid such as water is introduced into the container under pressure, whereby the tube is inflated at the turning point and in the preceding, everted section, during the Hose is compressed in the following, not everted section. By appropriately adjusting the internal pressure the hose compressed in the container is gradually unwound and moves to the nozzle, creating the turning point is shifted from the everted end outside the nozzle to the other end over the full length of the hose. Therefore works

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the fluid pressure not only to inflate and compress at the same time of the hose, but also as a propellant or propellant charge for pressing out the compressed hose from the nozzle with simultaneous, automatic eversion.

In a further improved variant of this embodiment, the hose is from the end at the core of a hose reel unwound. It has been found that the eversion of the tube in the first-mentioned embodiment is not carried out smoothly if it is made of a relatively rigid material or has a relatively small diameter. at In the improved embodiment, the compressed tube is unwound in a twisted state, whereby the Hose gets a smaller size and easily through the inner side of the everted hose with negligible frictional resistance passes through.

According to another embodiment of the method according to the invention We will use a self-rotating, endless double hose as an aid for inflating the hose at the turning point and used over a certain distance in the previous, everted section. In this case, the a mandrel or wire worn hose smoothly from the inside out with a relatively small force without use a closed pressure vessel and a fluid pressure turned will. The endless roll jacket loop is in this area

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for example
completely new. It can be produced by using a natural rubber or synthetic rubber, e.g. B. Butyl rubber, the hose produced is turned from one of its ends over half of its total length inside out and the everted end is connected to the other end of the hose that has not yet been turned inside out.In this way, the outer surface of the one The end of the hose, after being turned inside out, is connected to the inner surface of the other end of the hose to form a double-jacket hose which, in longitudinal section, is a caterpillar belt or an endless belt. This double-jacket hose can therefore be viewed as a three-dimensional, tubular, endless belt and it is easily self-rotating in its longitudinal direction due to friction when an external force is applied to the outer surface of the double-jacket hose. In actual use, the endless double-jacket hose is completely filled with a gaseous and / or liquid substance, so that the double-jacket hose can be inflated almost circularly in its cross-section and at the same time there is moderate friction between the inner surface of the flexible hose and the outer surface of the one used therein Rolled jacket hose to enable its self-rotation can be generated. In order to avoid mechanical damage, such as abrasion of the jacket tube due to friction, a suitable surface treatment can be carried out on the dumbbell tube. A preferred surface treatment comprises covering with tissue

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or other abrasion protection layers. The manufacture of the endless jacket hose is relatively simple and its size, i. H. The diameter and length can be set appropriately depending on the size of the flexible tube to be inverted will.

The flexible hose can consist of any fiber-like material that is woven or knitted and in the form of a hose is externally coated with a film made of natural rubber or synthetic rubber or a synthetic resin. Of the flexible hose can also be made of a water-permeable or water-impermeable synthetic resin material, that after molding and coated with a different kind of 'water-' impermeable resin / 'Preferred fiber materials are natural and synthetic, organic fibers and inorganic fibers, e.g. B. cotton, linen, glass, regenerated Cellulose, polyamide and polyester.

The invention is explained in more detail below with reference to the drawing; in the drawing are:

Fig. 1 is a view of the longitudinal section of a printing device for carrying out the everting of an outside with a Film of rubber or a synthetic resin with flexible hose coated • of uniform thickness;

Fig. 2 is a view of the longitudinal section of another embodiment, namely, the still further improved model of the device of FIG. 1;

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. ! 'ig. 3 is a view of the longitudinal section of an everting device using a roll jacket hose; FIG. 4 shows a view of the longitudinal section of an endless tubular tube; FIG.

FIG. 5 shows a view of the cross section of the endless roll-on hose from FIG. 4 along the section line AA ¹ ; FIG. 6 shows a view of the longitudinal section of a further everting device using an endless roll jacket ¹ hose.

In FIG. 1, a printing apparatus is shown for turning of flexible hoses from the inside to the outside. The flexible hose 1 consists of an everted section 1a, a non-everted section 1b and a section 1c at the turning point. A pressure vessel 2 carried on feet 7 has a nozzle 3 attached to the vessel 2. It can be tightly closed by means of a cover, not shown. The nozzle 3 is equipped at its pointed end with a metal fastening 4 for fastening the everted end of the flexible hose 1. The container 2 is as shown in the drawing, e.g. B. at its bottom, provided with an inlet 5 through which a fluid is introduced under pressure by means of a pump, not shown. A shaft 6 is mounted on the inner wall of the container 2.

A flexible hose 1 wound up as a coil is suspended on the shaft 6 in the pressure vessel 2. An outer end of the

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Hose 1 is pulled off and through the nozzle 5 from the inside of the container 2 passed through. The end of the hose 1 is then turned inside out and attached to the metal fastener 4 attached. The pressure vessel 2 is then tightly closed and a fluid is pumped into it through the inlet 5. As a pressure fluid water is particularly suitable. When the fluid is pumped into the container, the section 1c and the already everted Section 1a inflated round by the internal pressure of the fluid, while the non-everted portion 1b is kept in a floating state. Section 1c at the turning point is inflated from the inside by the fluid pressure and then from the inside to the outside to form the everted portion 1a under continuous forward movement of the section 1b to the turning point. The section 1b therefore changes to the Turning point to section 1c, which is then turned inside out to form section 1a. The hose in the pressure vessel 2 is unwound continuously and can be closed through nozzle 3 the turning point where the hose moves inside out is turned. Since the section 1c and the everted section 1a are inflated round by the internal fluid pressure, and da'der non-everted portion 1b is kept in a compressed state by the fluid pressure, the flexible tube 1 can be turned inside out smoothly and without difficulty. When * passing through section 1b that has not been turned inside out through the inside of the "everted portion 1a" there is some friction between the inner surface of the portion 1a

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and the outer surface of the portion 1b. However, since the pressurizing fluid acts as a lubricant, will the friction is noticeably reduced in this case. However, the use of a device of this type is not suitable if the hose material is relatively stiff or the diameter of the hose is relatively small, e.g. B. only 2.5 cm, eats. In one In such a case, the friction between the section 1a and the section 1b is not negligible, and the eversion can only can be achieved when extremely high pressure is applied to the device. This is the result of the fact that the portion 1b penetrating inside onto a cylindrical shape inflated portion 1a is kept in a flattened state, and the folded edge parts hereof lose their flexibility and offer resistance to being turned inside out at the turning point.

In Fig. 2 an improved variant of the device according to Fig. 1 is shown, wherein the wound into a coil, flexible hose 1 on a table 8 in the pressure vessel 2

8th
is arranged. The table / is preferably curved in a circular manner, as shown in the drawing, in order to stabilize the hose against unrolling. The hose is pulled out of the bobbin core, passed through the nozzle 5 and then treated further as was explained with reference to FIG. 1. In this improved variant, the hose pulled out of the central part of the hose reel is used, with none

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Rotation of the spool is allowed to be held in a twisted state as shown in the drawing. When a hose is twisted in a flattened state, the flattened tube is crimped in its cross-section such that it represents a ¹¹ C "shape, and in the extreme case, the folded edge portions of the flattened tube are adjacent to each other so as to almost a circular shape in cross-section In this way, the dimension of the portion 1b becomes smaller and easily passes through the everted portion 1a without substantial frictional resistance In actual operation using an apparatus as shown in Fig. 2, a tube 19 mm in diameter could easily go inside out when a pressure of 5 kg / cm or less is applied, while the same hose is not turned inside-out in a similar operation using the device of FIG. 1 even when a pressure of 8 kg / cm or higher is applied In the case of using a hose with a diameter of whom Each of the devices according to FIGS. 1 and 2 can be used at least 50.1 mm. When using the device of Fig. 1 for this case, however, the use of a guide means for bending the flattened tube into a U-shape or C-shape in cross section before the tube is passed through the everted portion 1a, thereby effectively reducing the Frictional resistance is reduced to a minimum.

A printing device according to FIG. 1 or FIG. 2 can have a plurality of nozzles in order to evert a plurality of hoses

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enable at the same time. In any case, the terminating end of the hose 1 arranged in the pressure vessel 2 must be tight be locked. When treating several tubes at the same time, they are not turned inside out at the same time, and one of the easiest tubes to turn inside out will be inside out first. If the final end of the hose is in the pressure device is not closed, the pressure causing fluid in the pressure vessel is violently by the ejected hollow, everted tube, thereby continuing the eversion treatment for the remaining tubes would be made impossible. The closing of the terminating end of the hose arranged in the pressure vessel is special advantageous if the embodiment of the method according to the invention described above for producing a tube by turning inside out an externally coated, tubular textile jacket is applied. The examination of pressure resistance and the detection of holes in such a hose can be carried out at the same time be carried out in the same pressure vessel after the manufacture of the hose.

In Fig. 3 is a further embodiment according to the invention shown. For this purpose, a flexible hose 1 is first placed tightly on a shaft 9i which is fastened at one end. An endless Kollmantelschlauch 10 is then placed on the flexible hose 1 and near the attached end of the Shaft 9 arranged. One end of the hose 1 near the attached

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The end is turned inside out and placed on the outer surface of the jacket tube 10 everted, whereby an everted section 1a and a section 1c at the turning point of the hose through the fluid pressure of the jacket tube 10 are inflated while a non-everted portion 1b of the hose is pressed onto the shaft by the fluid pressure. When the everted section 1a is drawn parallel to the shaft 9 along the axis extending outwardly from the fixed end of the shaft, moves the endless roll jacket hose 10 on the shaft 9 to the outside - to the left in the drawing - from the original Position as a result of self-rotation, and the section 1b is gently turned inside out according to the movement of the Rollciantels 10 turned over. In this case there is no strong pulling force required, and the turning point is from one end to the other end over the entire length of the hose 1 at relatively weak traction shifted.

In contrast to the method of British Patent Specification 957 929, in which a tube is wrapped in a hollow mandrel which has an inner diameter smaller than that of the tube, the method described above allows the everted tube to be produced which is free of wrinkles and other imperfections .

4 and 5 , an endless roll jacket hose is shown. This roll jacket hose 10 consists of an inner hose 11 and an outer hose 12, which are made of the same, flexible

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Material such as rubber or a synthetic resin, are made. The outer and inner tubes go at their left and right ends to form an endless one Jacket hose into each other. Since the inner tube 11 and the outer tube 12 each have the same diameter own, the inner tube is in a state corresponding to forcible insertion into the outer tube. When a pressurizing fluid is filled into the endless jacket hose 10, the outer hose 12 becomes circular Shape inflated in cross section, while the inner tube

11 is pressed out of shape. Since the inner hose 11 and the outer hose 12 have the same diameter and are made of a flexible material, a self-rotation of the jacket hose caused by friction between the outer hose and a hose attached to it causes the outer hose to alternate with the inner hose. In Fig. 4- the inner hose 11 moving due to the frictional force is turned inside out at the right end to form the outer hose 12, while the outer hose moving with the drawn hose by friction

12 is reversed in its running direction at the left end and pulled inward to form the inner tube 11. Such a self-rotation of the jacket hose 10 is continuous and, in the view of the longitudinal section, looks as if it were a movement of an endless belt or a caterpillar belt. The jacket hose 10 is on its inner surface

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with a device B for loading with fluid, e.g. B. a rubber plate like a tennis ball, or an air valve, like in the inner tubes of tires, through which a pressurizing, fluid substance and / or air into the inner space of the Mantelschlaucheε 10 introduced will.

In FIG. 6, a further embodiment is shown using the endless roll-on tube 10. A flexible one Hose 1 is wound up at one end to form a spool 13 through which a tape 14 runs over the full length of the hose 1 is used. One end of the endless roll-on hose is placed on the flexible hose 1, and the hose 1 is turned inside out at this end so that it covers the endless roll jacket 10. By the internal pressure of the bloated, endless roll jacket hose 10, the everted section 1a and section 1c are inflated at the turning point, while the non-everted portion 1b onto the belt 14 is pressed. The everted end of the hose 1 is fastened in this state to a suitable holding device, and the band 14 is then attached along the outward direction from the End extending axis, d. H. pulled in the direction running to the right in the drawing, whereby the turning point from one end to the other end over the entire length of the flexible hose 1 with continuous self-rotation of the SollmantelSschlauches 10 is shifted, whereby a smooth

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and gentle eversion of the flexible hose 1 is achieved '. Any desired cord, for example as wire, cord, line or cable, belt, etc., can be used for this purpose instead of the band 14 will. The endless Rollrcontelschlauch 10 must be about have the same diameter as the inner diameter of the flexible hose 1. If the diameter is too large, will it is difficult to apply the everted end of the hose 1 to the endless Hollmantelschlauch 10. If the diameter on the other hand, is too small, the portions 1a and 1c are not sufficiently inflated, so that they can be turned inside out smoothly and gently becomes difficult. However, the outer diameter of the endless roller tube 10 need not necessarily be exactly the same as the inner diameter of the flexible hose 1, but it can be of such a size that the already everted Section 1a can be kept in an almost circular cross-sectional shape.

In the embodiments of the method according to the invention under Using an endless roll-on hose, the eversion of a flexible hose can be carried out by two alternative methods be, namely in the first method by inserting a core shaft in a flexible hose, attaching one End of the shaft on a holding device and pulling the end of the hose into contact with the outer hose of the roll jacket hose along the axis extending outwardly from the attached end as shown in Figure 3, and in the other method by inserting a core shaft or a core cord into one

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flexible hose, attaching an everted end of the Hose on a holding device and pulling the core shaft or the core cord along the axis, which extends outwards from the attached end as shown in FIG. It is also possible to use both the core shaft and the to pull flexible hose in opposite directions to each other.

The feature of the method according to the invention is the puffing a flexible hose at the turning point and in a section that has already been turned inside out, while one that has not been turned inside out Section of the hose by applying an internal fluid pressure or by using a special, endless roll-barrel hose is squeezed. In this way, the passing of the non-everted section through the everted section is possible Section lighter, and the eversion of the hose can be smooth and gentle at the turning point with relatively little pulling force or extrusion force advance.

In the embodiment of the method according to the invention using the pressure vessel of Fig. 1 or 2, the pressure vessel must be able to withstand a high internal pressure, but it can be used for the simultaneous treatment of one or more flexible hoses ¹ of different diameters from about 12 mm to about 127 mm will. Hoses of any different sizes can be treated in the same pressure vessel, whereby

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only the nozzle has to be changed according to the size of the hose to be treated. This is a technical one and economic progress in the manufacture of hoses.

The embodiment of the method according to the invention in which an endless roller tube is used, is particularly advantageous, because the need for extensive and complicated Equipment is avoided as a flexible hose can easily be turned inside out using only two simple ones Tools can be turned over, d. H. a core part and a special, endless roll-on hose. This embodiment of the method according to the invention enables the treatment of flexible hoses with a wide variety of inner diameters by simply exchanging the endless roll-on hose according to the size and the inner diameter of the hoses, which are to be turned inside out. In the in the i'ig "3 is the use of a long one Shaft required, which has the same length as the flexible hose to be turned inside out, but with the force required to turn it inside out is so small that the pulling of the hose is carried out manually by an operator can be.

The method according to the invention is particularly useful as a processing step for turning inside out an externally coated, tubular, textile dumbbells in a method for the production of hoses

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for liquids under high pressure, such as fire hoses suitable defense by gen a coating of rubber or a synthetic resin on the outer surface of the hose-form! textile jacket is applied, and this is turned over from the inside to the outside. Of course you can

generally the method according to the invention / to the production of tubular material which has a lining or coating of uniform thickness and is free from defects, can be applied by turning inside out an externally coated tubular material.

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Claims (9)

Claims 1. Method of turning the inside of a flexible hose to the outside, marked by the fact that one a flexible hose is turned inside out at one of its ends, the end turned inside out attached to a holding device, the flexible hose at the turning point and in a section that extends from the Turning point extends to the attached end and has already been turned inside out, on an almost circular one Cross-section inflates while a subsequent, non-reversed section of the flexible hose, which is extends from the turning point to the other end, compresses, and you turn the inside-out section and moving the uninverted portion of the flexible tube along the axis extending from the attached end extends outwardly, the turning point from the attached end to the other end over the full length of the hose moves. 2. The method according to claim 1, characterized in that one the inflation of the flexible hose to an almost circular one Cross-section at the turning point and in a section that extends from the turning point to the attached End extends and has already been turned inside out, while simultaneously compressing a subsequent, non-reversed section of the flexible hose, 309881/0908 which extends from the turning point to the other end » by arranging the non-inverted, subsequent portion of the flexible hose extending from the turning point extends in a closed chamber and by introducing a pressurizing fluid into the closed chamber performs under pressure. 3. The method according to claim 2, characterized in that the flexible hose is pulled out of the coil core and the pulled end is turned inside out. 4 ·. The method of claim 2 or 3, characterized in that the one end is turned over inside out, while the other end is closed. 5. The method according to any one of claims 2 to 4, characterized in that that water is used as the pressurizing fluid 6. The method according to claim 1, characterized in that a core material is inserted into the flexible hose, the hose is passed through the inner hose of a flexible, endless roll jacket hose, one end of the hose is everted, the everted end is placed on the outer hose of the Kollmantel hose and the everted section of the Wühlnuches and the core material moved in opposite directions to each other while turning the flexible tube from the inside to the outside. 30988170908 "■ -4 ^ slsfsi. PAV 7. The method according to claim 6, characterized in that one a rigid shaft with one end attached to a holding device is used as core material and the one turned inside out Pulls portion of the flexible hose along the axis extending outwardly from the attached end. 8. The method according to claim 6, characterized in that a flexible cord is used as the core material, one is a End of the everted portion of the flexible hose attached to a holding device and then the cord along the axis extending outward from the attached end 9. Device for turning the inside of a flexible hose to the outside, characterized by a pressure vessel (2) for receiving the flexible hose (1), a nozzle (3), which is attached to the pressure vessel, a metal fastener '' supply device (4) for securing the flexible hose, herewith
which is mounted on a nose of the nozzle, and an inlet (5) attached to the container for introduction of a pressurizing fluid. 309881/0906 Blank page