JP2006336813A - Hose and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose 1 which is rather contracted longitudinally by pressurization, depending upon conditions, since elongation accompanied by a longitudinal extension of a warp 4 and contraction by a crook of the warp 4 with the expansion in the radial direction come together in a hose so that both elongation and contraction are canceled each other, leaving no longitudinal elongation. <P>SOLUTION: In the hose which forms a rubber or synthetic resin lining 5 at least in an inner surface of a cylindrical fabric 2 composed of the warp 4 running out longitudinally along the hose 1 and a weft 3 spirally woven, crossing the warp 4, the warp 4 runs out practically linearly longitudinally along the hose 1 and the weft 3 is crooked and woven against the warp 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hose, and relates to a hose of a type in which a lining is formed at least on the inner surface of a cylindrical woven fabric in which warp and weft are woven into a cylindrical shape. This relates to the fire hose.

  A hose of a type in which a lining is formed on the inner surface of a cylindrical fabric as described above is widely used as a fire hose because it is easy to manufacture a hose having a relatively large diameter and is light and excellent in pressure resistance. .

  Thus, in general, in such a fire hose, when the internal pressure is applied, a force twice as long as the longitudinal direction acts in the circumferential direction of the tubular fabric, so that the weft yarn mainly bears the pressure resistance of the hose. Become.

  Therefore, normally, as shown in FIG. 1, a high-strength yarn is used as the weft thread 3 in the tubular fabric 2 of the hose 1, and the weft thread 3 is almost straight along the circumferential direction of the hose 1. The warp yarn 4 is woven into the weft yarn 3 while being bent into a waveform.

  By using such a tubular woven fabric 2, the diameter of the hose 1 is prevented from expanding when internal pressure is applied and the pressure resistance is reduced, and the weft thread 3 bearing the pressure resistance is wrapped with the warp threads 4. It is possible to prevent the weft 3 from being damaged.

  However, when an internal pressure is applied to the hose 1, a force is applied in the circumferential direction of the tubular fabric 2, and at the same time, half the force applied in the circumferential direction per unit width is also applied in the length direction. In the hose 1, since the warp yarn 4 of the tubular fabric 2 is bent severely, when a force is applied in the length direction of the hose 1, the hose 1 extends in the length direction by releasing the bending. It is easy. In general, fire hoses are allowed to grow by 10% or less when an internal pressure corresponding to the working pressure is applied according to the Ordinance of the Ministry of Home Affairs.

  However, such long stretches have become a major obstacle in long (100 to several hundred meters) large-diameter (150 to 300 mm) fire hoses installed in the above-mentioned petroleum complexes and the like.

  That is, when internal pressure is applied from the state where the hose 1 is filled with water and the hose 1 is stretched, the hose 1 meanders sideways in order to absorb the excess length generated by the stretch, but the internal pressure increases. Accordingly, when the side slip of the hose 1 starts at a location where the frictional resistance between the road surface and the hose 1 is relatively small, the side slide is concentrated on the location, and the hose 1 may be largely detached from the installation route.

  Fire hoses used in normal fire fighting activities have a relatively small diameter of several tens of millimeters, so the force acting in the length direction during pressurization is not so great, and the hose filled with water Since the weight is not excessive, the meandering path of the hose can be controlled manually.

  However, in the case of a fire hose having a large diameter as described above, the weight of the hose filled with water may exceed 10 times that of a general fire hose, and accordingly, in the length direction when pressurized. The force acting on the sway increases, and it is impossible to control the meandering path by hand.

In oil complexes such as those mentioned above, fire hoses are often installed on oil barriers with relatively low undulations, and fire hoses filled with water meander and fall from the oil breakwater. The hose may be damaged, and it is very difficult to return the fallen fire hose to the oil breakwater.
JP 2003-343768 A

  The present invention has been made in view of such circumstances, and provides a hose that is suitable for use as a large-diameter fire fighting hose installed in the above-described petroleum complex and that does not cause elongation when pressurized. It is for the purpose.

  Thus, the hose of the present invention has a rubber or synthetic resin lining at least on the inner surface of a cylindrical fabric composed of warp yarns extending in the length direction of the hose and weft yarns that are spirally woven across the warp yarns. In the formed hose, the warp yarn extends substantially linearly with respect to the length direction of the hose, and the weft yarn is woven while being bent with respect to the warp yarn.

  In the hose of the present invention, it is preferable that the outer surface of the tubular fabric is coated with rubber or synthetic resin. Further, the tubular woven fabric of the hose may be woven by a plain woven structure or a ridge woven structure, or may be a twill woven structure with little continuous ups and downs such as a 2/1 twill woven structure.

  The hose manufacturing method of the present invention also includes a tubular fabric comprising a warp thread extending in the length direction of the hose and a weft thread woven in a spiral shape intersecting the warp thread in the length direction of the tubular fabric. A lining is formed at least on the inner surface of the tubular woven fabric while elongating under load. The magnitude of the load in this method is suitably 25 to 80% of the force acting in the length direction of the hose when an internal pressure corresponding to the working pressure is applied to the hose.

  According to the present invention, since the warp yarn in the tubular fabric of the hose extends almost linearly, when the internal pressure is applied to the hose, the warp yarn is elongated due to elongation with respect to the tensile load of the warp yarn. , Don't extend any further.

  On the other hand, the weft yarn is woven while being bent with respect to the warp yarn, so that when the hose is subjected to internal pressure and a force is applied to the tubular fabric in the circumferential direction, the weft yarn is not only stretched against its tensile load but also bent. A force is generated to make the state straight, and the warp yarn that has been linearly extended by the force is bent, and the hose is contracted in the length direction.

  Therefore, the hose stretches due to the extension of the warp yarn and contracts in the length direction due to the warp yarn being bent by expanding in the radial direction at the same time. Is hardly stretched, and depending on the conditions, it is rather shrunk in the length direction by pressurization.

  Therefore, since the hose of the present invention hardly stretches in the length direction when the internal pressure is applied, it does not meander from the hose installation path. Therefore, there is no obstacle to the operation across the installation route, and even when installed on the oil breakage, it does not fall from the oil breakage, and the workability is extremely good.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a hose 1 according to the present invention. The hose 1 has a rubber or soft synthetic resin lining 5 formed on the inner surface of a cylindrical fabric 2 in which weft yarns 3 and warp yarns 4 are woven into a cylindrical shape. Is. The outer surface of the tubular fabric 2 may be coated with rubber or synthetic resin.

  In FIG. 2, the tubular woven fabric 2 is formed by weaving the weft yarn 3 and the warp yarn 4 in a plain weave structure. However, the structure of the tubular fabric 2 is not limited to the plain weave structure and is continuous such as 2/1 twill weave or ridge weave It is also possible to use a tissue with relatively little ups and downs.

  In order to increase the pressure resistance of the hose 1, it is necessary to increase the warp yarn 4 per unit width. However, if the number of the warp yarns 4 is increased, it becomes difficult to adopt a structure in which the weft yarn 3 is bent. In such a case, by making the weave structure of the tubular woven fabric 2 into a twill weave, there is a margin between the warp yarns 4 and it is easy to adopt a structure in which the weft yarns 3 are bent.

  Thus, in the present invention, the warp yarn 4 extends substantially linearly in the length direction of the hose 1 as shown in FIG. 2B, and the weft yarn is shown in FIG. As shown in (a), it is woven while being bent.

  In the present invention, the warp yarn 4 should not be bent at all with respect to the length direction of the hose 1, but in a state of no load in a state where the lining 5 is formed on the tubular fabric 2 to form the hose 1. In this case, even if the warp yarn 4 has some bending, it is necessary that the warp yarn 4 is significantly smaller than the degree of bending of the weft yarn 3.

  In the hose 1 of the present invention, the warp yarn 4 extends substantially linearly, and the weft yarn 3 is woven while being bent with respect to the warp yarn 4. Therefore, when an internal pressure is applied to the hose 1, a tubular shape is obtained. A large pulling force acts in the circumferential direction of the hose 1 in the fabric 2, and the weft 3 reduces the degree of bending by the pulling force and tries to extend straight along the circumferential direction of the hose 1.

  Since the weft yarn 3 is woven with the warp yarn 4, when the weft yarn 3 tries to extend straight, the warp yarn 4 that is woven crossing the weft yarn 3 is bent, and as shown in FIG. The bending of the weft yarn 3 is reduced, and the warp yarn 4 woven in a straight line is bent.

  Due to the internal pressure acting on the hose 1, a tensile force acts on the tubular fabric 2 also in the length direction thereof, thereby providing resistance against the warp yarn 4 being bent. When an internal pressure is applied, twice the force in the length direction acts in the circumferential direction per unit width, so that twice the force of the warp yarn 4 acts on the weft yarn 3 in the tubular fabric 2 as well. Against the resistance due to the pulling force, the bending of the weft 3 is reduced by the pulling force in the circumferential direction, and the warp 4 is bent.

  And when the warp yarn 4 is bent, the tubular fabric 2 is contracted in the length direction. On the other hand, as described above, a tensile force acts on the tubular fabric 2 in the length direction, and the warp yarn 4 extends and the tubular fabric 2 extends by the tensile force. The change in length is greatly reduced.

  On the other hand, when an internal pressure is applied to the hose 1, a large pulling force is also applied in the circumferential direction of the tubular fabric 2, and the degree of bending of the weft 3 that has been bent as described above is reduced by the force. Compared with the above-described conventional hose, it expands greatly in the radial direction. Therefore, when designing the tubular fabric 2, it is necessary to design it so that it can sufficiently withstand the working pressure of the hose 1 in a state where the diameter is expanded.

  In general, this type of hose is usually folded and stored in a flat folded state on a reel or folded in the length direction, and when necessary, it is installed along the installation path. . Therefore, when installing, it is difficult to install in a tensioned state, and a slight slack occurs.

  Therefore, it is preferable that the hose 1 of the present invention is one that slightly contracts its length and absorbs the slack when the internal pressure is applied to increase the pressure to the working pressure. The shrinkage rate is suitably about 0.5 to 3%.

  In order to manufacture the hose 1 of the present invention, a tubular woven fabric 2 composed of warp yarns 4 and weft yarns 3 is woven and stretched by applying a load in the length direction of the tubular woven fabric 2, while at least A rubber or synthetic resin lining 5 is formed on the inner surface.

  At the stage of weaving the tubular woven fabric 2, it is not necessary to have a structure in which the warp yarn 4 extends linearly and only the weft yarn 3 is bent. By extending the tubular fabric 2 with a load in its length direction, the warp yarn 4 is extended in a straight line, and the weft yarn 3 is bent with respect to the warp yarn 4.

  In this state, by forming the lining 5 on at least the inner surface of the tubular fabric 2, the structure in which the warp yarn 4 extends in a straight line and the weft yarn 3 is bent is fixed by the rubber or synthetic resin of the lining 5, It becomes a hose.

  The magnitude of the load when the tubular fabric 2 is extended by applying a load in the length direction is the force acting in the length direction of the hose 1 when an internal pressure corresponding to the working pressure is applied to the hose 1. Of 25 to 80%.

  If it is less than 25%, the warp yarn 4 may not extend sufficiently linearly. Moreover, if the force of 80% is applied, the warp yarn 4 will be in a state of extending sufficiently in a straight line, and it will be meaningless to apply a large force beyond that, and an excessively large force will be applied. This is not preferable.

  The method for forming the lining 5 on the tubular woven fabric 2 is not particularly limited. For example, the method described in Japanese Utility Model Laid-Open No. 49-93969 can be used. This method will be schematically described with reference to FIG.

  The tubular fabric 2 passes through the head 6 of the extrusion molding machine, and a mandrel 7 is inserted into the tubular fabric 2 in the head 6, and the mandrel 7 is connected to the tubular fabric 2 via a rod 8. Supported behind.

  When the tubular fabric 2 is pulled from the front to pass through the head 6 and a molding material 9 made of rubber or synthetic resin is press-fitted into the head 6, a part of the molding material 9 is in the tubular fabric at the tip of the head 6. The coating layer 10 is molded on the surface of 2.

  Further, another part of the molding material 9 passes between the cloths of the tubular fabric 2 and enters the passage 12 formed in the mandrel 7 through the through hole 11 and is lined on the inner surface of the tubular fabric 2 at the tip of the mandrel 7. 5 is molded.

  In FIG. 4, the coating layer 10 is shown as being formed on the surface of the tubular fabric 2, but the inner diameter at the tip of the head 6 is reduced so as not to form a gap with the tubular fabric 2. Thus, it is possible not to form the covering layer 10.

  Thus, according to this method, a frictional resistance is generated between the tubular fabric 2 and the head 6 or mandrel 7, and the molding material 9 passes through the fabric of the tubular fabric 2, so that the tubular fabric 2 is passed through the head. In order to pass through 6, a considerable traction force is required, and this traction force becomes a load applied in the length direction of the tubular fabric 2 in the present invention.

  As the warp yarn 4, 307 yarns twisted with 12 polyester yarns of 1670 dtex were used, and as the warp yarn 3, 30 yarns of 14 polyester yarns of 1670 dtex twisted were driven between 100 mm, and the inner diameter was 200 mm. The tubular woven fabric 2 is woven, and a polyurethane elastomer lining 5 and a covering layer 10 are formed on the inner and outer surfaces of the tubular woven fabric 2 by the method shown in FIG. Hose 1 was made. The breaking pressure of the hose 1 was about 3.0 MPa.

  An internal pressure was applied to the hose 1 to increase the internal pressure to 1.0 MPa. The change in the length of the hose 1 as the pressure rises is as shown in FIG. 5. As the pressure rises, the length of the hose 1 shrinks up to 0.5 MPa, and the maximum shrinkage is about It was 1.8%. After that, even if the pressure was raised, there was almost no expansion and contraction, and the contraction rate at 1.0 MPa was about 1.7%.

  Twelve 1670 dtex polyester yarns were twisted as warp yarn 4 and 250 yarns obtained by aligning two yarns were further used, and 14 polyester yarns of 1670 dtex were twisted as weft yarn 3 to make 2/2. The tubular woven fabric 2 having an inner diameter of 300 mm was woven by driving 36 knives in a 100 mm woven structure. While applying a load of 30000 N to this, a polyurethane elastomer lining 5 and a covering layer 10 were formed on the inner and outer surfaces of the tubular fabric 2 by the method shown in FIG. 4 to produce a hose 1 having a working pressure of 1.0 MPa. The breaking pressure of the hose 1 was about 2.7 MPa.

  An internal pressure was applied to the hose 1 to increase the internal pressure to 1.0 MPa. The change in the length of the hose 1 as the pressure rises is as shown in FIG. 5. As the pressure rises, the length of the hose 1 shrinks up to 0.5 MPa, and the maximum shrinkage is about It was 1.3%. Thereafter, as the pressure increased, the length of the hose 1 increased and the contraction rate recovered slightly, but the contraction rate at 1.0 MPa was about 1.02%.

The conventional fire hose is shown, Comprising: (a) is a cross-sectional view, (b) is a partial central longitudinal cross-sectional view. The pressureless state of the hose of this invention is shown, Comprising: (a) is a cross-sectional view, (b) is a partial central longitudinal cross-sectional view. The state which made the internal pressure act on the hose of this invention is shown, Comprising: (a) is a cross-sectional view, (b) is a partial center longitudinal cross-sectional view. Central longitudinal sectional view of the apparatus showing the state of manufacturing the hose of the present invention The graph which shows the change of the length accompanying the pressurization of the hose of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hose 2 Cylindrical fabric 3 Weft thread 4 Warp thread 5 Lining 10 Coating layer

Claims (6)

Rubber on at least the inner surface of the tubular woven fabric (2) comprising the warp yarn (4) extending in the length direction of the hose (1) and the weft yarn (3) spirally woven across the warp yarn (4). Alternatively, in the hose (1) in which the synthetic resin lining (5) is formed, the warp yarn (4) extends substantially linearly with respect to the length direction of the hose (1), and the warp yarn (4) A hose characterized in that the weft thread (3) is woven while being bent. Hose according to claim 1, characterized in that the outer surface of the tubular fabric (2) is also provided with a coating layer (10) of rubber or synthetic resin. The hose according to claim 1 or 2, characterized in that the tubular woven fabric (2) is woven by a plain weave structure or a ridge structure. The hose according to claim 4, wherein the twill structure is a 2/1 twill structure. A tubular fabric (2) comprising a warp yarn (4) extending in the length direction of the hose (1) and a weft yarn (3) woven in a spiral shape intersecting with the warp yarn (4) is obtained as the tubular fabric. A method for producing a hose characterized by forming a lining (5) on at least the inner surface of the tubular fabric (2) while applying a load in the length direction of (2) and extending. The load is 25 to 80% of the force acting in the length direction of the hose (1) when an internal pressure corresponding to the working pressure is applied to the hose (1). Manufacturing method of hose as described in

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