JP2011064305A - Hose for transportation with wear detecting function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose for transportation with a wear detecting function that can easily and surely detect the degree of wear on the outer surface side and inner surface side of a hose wall only by visual observation from the outside in spite of providing a hose wall with a reinforcing core. <P>SOLUTION: The hose for transportation includes a synthetic resin hose wall 1 formed by laminating a yellow transparent outer layer 3, a blue transparent or red transparent inner layer 4 and a colorless transparent intermediate layer 5 located between the outer layer 3 and the inner layer 4. The reinforcing core 2 made of colorless transparent synthetic resin is embedded in the intermediate layer 5 of the hose wall 1, and the color of the hose wall 1 changes according to the degree of wear of the outer layer 3 and the degree of wear of the inner layer 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transport hose for transporting various solids and fluids, and more particularly to a transport hose having a wear detection function capable of detecting the wear degree of a hose wall.

  In general, in a transport hose made of synthetic resin that transports various solids and fluids, the inner surface of the hose wall wears over time as the solids and fluids come into contact. Further, not only the inner surface of the hose wall but also the outer surface of the hose wall may be worn due to friction between the hoses and contact with foreign matter. As the wear of the hose wall progresses, cracks and breaks eventually occur, causing a leakage accident.

  In order to prevent such problems, it is common to replace the hose periodically with a new hose. In this case, it is difficult to properly predict the replacement time of the hose, The progress was faster than expected, causing cracks and breaks in the hose before the replacement, and replacing a sufficiently usable hose.

  For this reason, in recent years, a transport hose that can detect the wear of the hose wall has been proposed. As this type of transport hose, for example, as disclosed in Patent Document 1, the outer layer and the inner layer of the multi-layered hose wall are made different in color, and the outer surface of the hose wall is worn by the wear of the outer layer of the hose wall. It is known that the inner layer is exposed on the side and the outer layer is exposed on the inner surface side of the hose wall due to the wear of the inner layer of the hose wall so that the wear on the outer surface side and the inner surface side of the hose wall can be detected. .

  Further, as disclosed in, for example, Patent Document 2, the outer layer and the inner layer of the multi-layered hose wall are made transparent, and the inner layer is colored, so that the wear of the inner layer of the hose wall proceeds. As the color of the hose wall gradually changes as the color of the inner layer fades away at the wear point, and the color change is visually confirmed from the outside, wear on the inner surface of the hose wall There are also known ones that can detect the degree.

JP 2003-247668 A Japanese Utility Model Publication No. 5-31870

  However, in the transportation hose as disclosed in Patent Document 1, particularly when detecting wear on the inner surface of the hose wall, the hose is once removed and the inner surface of the hose wall is visually observed. It was necessary to insert a small camera or fiberscope into the wall for observation, and the confirmation work was complicated.

  Further, the wear of the hose wall can be detected only when the outer layer or the inner layer disappears due to wear and the inner layer is exposed on the outer surface side of the hose wall or the outer layer is exposed on the inner surface side of the hose wall. Because of this, it was not possible to detect the process until the hose wall was gradually worn (degree of wear). For this reason, for example, wear was not detected at the time of inspection of the hose, but wear may have progressed considerably at that time, and a leakage accident may have already occurred at the next inspection. In addition, there is a problem that it is difficult to take measures such as prolonging the life of the pipe by finding a hose that is likely to be worn out at an early stage and appropriately replacing the hose with another hose.

  On the other hand, in the transportation hose as disclosed in Patent Document 2, it is possible to detect the degree of wear on the inner surface side of the hose wall only by confirming the color change of the hose wall from the outside. The change in the color of the hose wall is due to the color of the inner layer (single color) and is difficult to understand.

  Moreover, sufficient consideration has not been given to the detection of the degree of wear on the outer surface side of the hose wall. In other words, even if the outer layer of the hose wall progresses, the color of the hose wall does not fade and the color of the hose wall hardly changes. Even if it confirmed, it was difficult to detect the abrasion degree of the hose wall outer surface side.

  Furthermore, in the transport hose, it is generally made to spirally wind a reinforcing core around the hose wall to increase the pressure strength, but particularly in the transport hose as disclosed in Patent Document 2, When the reinforcing core is provided on the hose wall, there is a problem that the reinforcing core obstructs and it is difficult to visually recognize the change in the color of the hose wall, which hinders detection of the degree of wear of the hose wall.

  Therefore, the present invention eliminates the above-mentioned problems and makes it easy to determine the degree of wear on the outer surface side and the inner surface side of the hose wall only by visual inspection from the outside, even though a reinforcing core is provided for the hose wall. It is another object of the present invention to provide a transport hose having a wear detection function that can be reliably detected.

  In order to solve the above problems, a transport hose having a wear detection function according to the present invention transports a solid or fluid, and has a colored translucent outer layer 3 and a colored translucent. A synthetic resin hose wall 1 formed by laminating an inner layer 4 having properties and an intermediate layer 5 having colorless or colored translucency located between the outer layer 3 and the inner layer 4; The intermediate layer 5 of the hose wall 1 has a colorless or colored translucent synthetic resin reinforcing core 2 embedded therein, and the outer layer 3, the inner layer 4 and the intermediate layer 5 are different in color. In addition, the color of the hose wall 1 is changed according to the degree of wear of the outer layer 3 and the degree of wear of the inner layer 4 by making the colors of the intermediate layer 5 and the reinforcing core 2 the same. It is characterized by. Note that “having translucency” specifically means a transparent or translucent state.

  Specifically, the outer layer 3 is yellow transparent, the inner layer 4 is blue transparent or red transparent, and the intermediate layer 5 and the reinforcing core 2 are colorless and transparent. The thickness of the outer layer 3 is uniform over the entire circumference, the thickness of the inner layer 4 is uniform over the entire circumference, and the thickness of the intermediate layer 5 in a state where the reinforcing core 2 is embedded. Is uniform over the entire circumference. Further, the reinforcing core 2 is embedded so as to be within the thickness of the intermediate layer 5.

  In the transport hose of the present invention, as the outer layer of the hose wall progresses in wear, the color of the outer layer gradually fades at the worn portion, and the color of the hose wall gradually changes. As the wear of the inner layer progresses, the color of the inner layer gradually fades at the wear point, and the color of the hose wall gradually changes. By just checking, it is possible not only to detect a certain amount of wear on the outer surface side and inner surface side of the hose wall, but also to easily detect the degree of wear on the outer surface side and inner surface side of the hose wall. Moreover, the change in the color of the hose wall is not a change due to the shade of a single color, but a drastic change in the hue from the mixed color in which the colors of each layer are mixed to the color excluding the colors of the outer layer and the inner layer. Therefore, it can be easily recognized and the degree of wear on the outer surface side and the inner surface side of the hose wall can be reliably detected.

  Moreover, since a colorless or colored translucent intermediate layer is interposed between the outer layer and the inner layer and a reinforcing core of the same color as the intermediate layer is embedded, the line of sight is blocked by the reinforcing core. In the hose wall, the reinforcing core does not float in a streak shape, and gradation does not occur. Even though the hose wall is reinforced with a reinforcing core, the color change of the hose wall can be seen well. can do.

  Also, the outer layer color is yellow with high brightness, the inner layer color is blue or red with a lower brightness than yellow, the intermediate layer and the reinforcing core are colorless and transparent, and blue or red with low brightness when the inner layer is worn By reducing the thickness of the hose wall, the change in the color of the hose wall with the progress of the wear of the inner layer becomes easier to understand, and the degree of wear on the inner surface side of the hose wall can be reduced even in an environment such as a dark place. It can be detected reliably.

  Furthermore, the wall thickness of the intermediate layer in which the outer layer, the inner layer, and the reinforcing core are embedded is made uniform over the entire circumference, or the reinforcing core is embedded so as to be within the thickness of the intermediate layer, so that the hose wall Can be colored without any spots over the entire circumference, and the change in the color of the hose wall can be visually recognized even better.

It is a partially broken front view of the transportation hose which concerns on one Embodiment of this invention. It is the principal part expanded sectional view similarly.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A transport hose according to an embodiment of the present invention is for transporting solids such as plastic pellets, for example, and as shown in FIG. The reinforcing core 2 made of metal is integrally provided.

  The hose wall 1 has a colored translucent outer layer 3, a colored translucent inner layer 4, and a colorless translucency located between the outer layer 3 and the inner layer 4. The intermediate layer 5 is laminated in the hose radial direction. The hose wall 1 is formed in a cylindrical shape whose inner and outer peripheral surfaces are substantially smooth, and the thickness in the hose radial direction is uniform over the entire circumference, and has translucency over the entire circumference. However, it is in a colored state.

  Specifically, the outer layer 3 has a substantially smooth inner and outer peripheral surface using, for example, a soft vinyl chloride resin having excellent flexibility and a material mixed with a yellow pigment such as condensed azo. It is formed in a cylindrical shape, the thickness in the hose radial direction is uniform over the entire circumference, and it is yellow and transparent with no spots over the entire circumference. The main material of the outer layer 3 is not limited to vinyl chloride resin, and other synthetic resins having translucency such as olefin resin and urethane resin may be used. The pigment mixed in the main material is not limited to condensed azo, and other yellow pigments may be used.

  The inner layer 4 has a substantially smooth inner and outer peripheral surface using, for example, a urethane resin having excellent wear resistance as a main material and a material mixed with a blue pigment such as cyanine blue (α). It is formed, the thickness in the hose radial direction is uniform over the entire circumference, and it is blue and transparent with no spots over the entire circumference. The main material of the inner layer 4 is not limited to urethane resin, and other synthetic resin having translucency such as olefin resin or vinyl chloride resin may be used. Further, the pigment mixed in the main material is not limited to cyanine blue (α), and other blue pigments may be used.

  The intermediate layer 5 is formed in a cylindrical shape whose inner and outer peripheral surfaces are substantially smooth using, for example, a material mainly made of soft vinyl chloride resin having excellent flexibility. In this intermediate layer 5, for example, a reinforcing core 2 formed using a material mainly made of hard vinyl chloride resin is accommodated within the thickness of the intermediate layer 5 in the hose radial direction so that the hose shaft It is embedded in a spirally wound state with an interval in the direction. The intermediate layer 5 and the reinforcing core 2 are both colorless and transparent. In the intermediate layer 5 in which the reinforcing core 2 is embedded, the thickness in the hose radial direction is uniform over the entire circumference. It is colorless and transparent over the circumference. In addition, as a main material of the intermediate | middle layer 5 and the reinforcement core 2, you may use other synthetic resins which have translucency like not only a vinyl chloride resin but an olefin resin and a urethane resin. Moreover, although the cross-sectional shape of the reinforcing core 2 in the hose radial direction is formed in a substantially elliptical shape, it may be any shape such as a substantially circular shape or a substantially polygonal shape.

  In the transport hose configured as described above, while maintaining good flexibility by the outer layer 3 and the intermediate layer 5, wear resistance is secured by the inner layer 4 on the inner surface side, and pressure resistance strength is further provided by the reinforcing core 2. Has been increased. The outer layer 3, the inner layer 4, and the intermediate layer 5 have different colors, but the outer layer 3 is transparent in yellow and the inner layer 4 is transparent in blue. As a result, the hose wall 1 is green and transparent with no spots over the entire circumference. If the thickness of the outer layer 3 or the inner layer 4 is too thin or too thick, either the outer layer 3 or the inner layer 4 is overemphasized and it is difficult to make the hose wall 1 green. Therefore, the thickness in the hose radial direction of the outer layer 3 and the inner layer 4 is set to 10 to 30% with respect to the thickness of the hose wall 1 in the hose radial direction.

  The transport hose is manufactured as follows. First, a material in which a blue pigment such as cyanine blue (α) is mixed into a pellet made of urethane resin is extruded by an extruder to form a belt for forming an inner layer, and this belt is spirally formed on a mandrel. The inner layer 4 is formed by winding and heat-sealing the adjacent edge portions of the preceding band and the subsequent band.

  Subsequently, the belt-shaped body for forming the intermediate layer containing the reinforcing core 2 is formed by extruding the soft vinyl chloride resin pellets and the hard vinyl chloride resin pellets integrally with a co-extrusion machine. Is wound on the outer peripheral surface of the inner layer 4 in a spiral manner, and the intermediate core 5 in which the reinforcing core 2 is embedded by thermally fusing the adjacent edge portions of the preceding belt-like body and the following belt-like body together. Form.

  Finally, a material made by mixing a yellow pigment such as condensed azo into pellets made of soft vinyl chloride resin is extruded by an extruder to form a band for forming the outer layer, and this band is formed on the outer periphery of the intermediate layer 5. The outer layer 3 is formed by spirally winding on the surface and heat-sealing the adjacent edge portions of the preceding band and the subsequent band.

  Then, the outer layer 3, the intermediate layer 5 in which the reinforcing core 2 is embedded, the inner layer 4, using the melting heat of the inner layer constituting band, the intermediate layer constituting band, and the outer layer constituting band. Are fused together to produce a hose. In manufacturing the hose, not only extruding the band for the inner layer, the band for the intermediate layer and the band for the outer layer separately and winding them in a spiral shape, but also coextruding them. They may be extruded together by a machine and wound in a spiral.

  When such a transport hose is used to transport solids such as plastic pellets, the inner surface side of the hose wall 1, that is, the inner layer 4 has wear resistance, but the solids such as plastic pellets With the collision, the inner layer 4 is worn over time.

  When the inner layer 4 of the hose wall 1 starts to be worn, the thickness of the inner layer 4 is reduced at the worn portion, and the blue color of the inner layer 4 is reduced. Accordingly, when the hose wall 1 is viewed from the outside, the yellow color of the outer layer 3 is emphasized and looks yellowish green at the worn portion. In addition, in a wear part, it exists in the tendency which whitens because of a damage, and yellowish green is further raised.

  When the wear of the inner layer 4 proceeds, when the hose wall 1 is viewed from the outside, the yellow color of the outer layer 3 is further emphasized and looks green near yellow at the worn portion. When the wear of the inner layer 4 further progresses and the inner layer 4 disappears and the inner peripheral surface of the intermediate layer 5 is exposed on the inner surface side of the hose wall 1, only the yellow color of the outer layer 3 becomes visible. In this case, the difference in color can be clearly recognized as compared with the green color where no wear has occurred. Therefore, if the time when the inner layer 4 disappears is set as the replacement time of the hose, the change time of the hose can be surely known by the change in the hue of the hose wall 1 from green to yellow as described above. it can.

  In addition, the outer surface side of the hose wall 1, that is, the outer layer 3, may be worn due to friction between the hoses or contact with foreign matter. When the outer layer 3 of the hose wall 1 starts to be worn, the thickness of the outer layer 3 is reduced at the worn portion, and the yellow color of the outer layer 3 is reduced. Accordingly, when the hose wall 1 is viewed from the outside, the blue color of the inner layer 4 is emphasized and looks blueish green at the worn portion. In addition, in a wear location, there exists a tendency which becomes white due to a damage | wound, and blue-green is further raised.

  When the wear of the outer layer 3 progresses, when the hose wall 1 is viewed from the outside, the blue color of the inner layer 4 is further emphasized and looks green near blue in the worn part. When the outer layer 3 further wears and the outer layer 3 disappears and the outer peripheral surface of the intermediate layer 5 is exposed on the outer surface side of the hose wall 1, only the blue color of the inner layer 4 becomes visible. In this case, the difference in color can be clearly visually recognized as compared with the green color where no wear has occurred. Therefore, if the time when the outer layer 3 disappears is set as the replacement time of the hose, the replacement time of the hose can be surely known by the change in the hue of the hose wall 1 from green to blue as described above. it can.

  Thus, in the transport hose described above, as the wear on the outer surface side and the inner surface side of the hose wall 1 progresses gradually, that is, the degree of wear of the outer layer 3 and the wear of the inner layer 4 on the hose wall 1. Since the color of the hose wall 1 gradually changes according to the degree, a certain amount of wear on the outer surface side and the inner surface side of the hose wall 1 can be confirmed by just visually checking the color of the hose wall 1 from the outside. In addition to simply detecting, it is possible to easily detect the degree of wear. Moreover, the change in the color of the hose wall 1 is not a change due to the shade of a single color, but a drastic change in the color from green to blue and from green to yellow. It can be detected reliably.

  For this reason, when checking the hose, it is possible to know the time to replace the hose as well as to detect the wear of the hose wall 1 from the initial stage. For example, the leakage period is reduced by shortening the period until the next inspection. Therefore, it is easy to take measures to prolong the life of the pipe by surely preventing the occurrence of the hose or discovering a hose that is likely to be worn out at an early stage and appropriately replacing the hose.

  In addition, when detecting the degree of wear on the outer surface side of the hose wall 1, it is possible to directly check the wear location from the outside together with the color change of the hose wall 1. When detecting, it is necessary to rely only on the color change of the hose wall 1. In the above transportation hose, the outer layer 3 is yellow with high brightness, the inner layer 4 is blue with lower brightness than yellow, and the blue with low brightness is faded when the inner layer 4 is worn, The change in the color of the hose wall 1 accompanying the progress of wear of the inner layer 4 is more easily understood, and for example, the degree of wear on the inner surface side of the hose wall 1 can be reliably detected even in an environment such as a dark place. Can do.

  Further, when the hose wall 1 is reinforced by providing the reinforcing core 2, there is a concern about deterioration in visibility when visually recognizing the color change of the hose wall 1, but between the outer layer 3 and the inner layer 4. Since the colorless and transparent intermediate core 5 is interposed and the colorless and transparent reinforcing core 2 is embedded so as to be within the thickness of the intermediate layer 5, the line of sight is blocked by the reinforcing core 2 or the hose wall 1 In this case, the spiral pattern by the reinforcing core 2 does not appear and gradation does not occur, and the hose wall 1 is colored without any spots over the entire circumference, so that the change in the color of the hose wall 1 can be seen well. it can.

  The present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, the transport hose of the present invention is not limited to transporting plastic pellets, but also other solids such as food, industrial parts, various granules and powders, and earth and sand. It may be for transporting various fluids such as water, ready-mixed concrete and the like.

  Further, the combination of the colors of the outer layer 3 and the inner layer 4 can be arbitrarily set as long as both have translucency and are different colors and the change in the color of the hose wall 1 is easily understood. For example, the inner layer 4 may be made red transparent instead of blue transparent. In this case, the hose wall 1 becomes orange transparent with no spots over the entire circumference, depending on the degree of wear of the inner layer 4 of the hose wall 1. The color gradually changes from orange to yellow, and gradually changes from orange to red according to the degree of wear of the outer layer 5 of the hose wall 1. In this case as well, the same effects as when the inner layer 4 is blue transparent are obtained.

  Further, the outer layer 3 and the inner layer 4 may be configured by laminating a plurality of colored layers having translucency. In this case, the color of the hose wall 1 changes in a good manner depending on the degree of wear of the outer layer 3 and the degree of wear of the inner layer 4.

  Further, the intermediate layer 5 and the reinforcing core 2 do not necessarily need to be colorless and transparent, both have translucency, are the same color, and are different from the outer layer 3 and the inner layer 4, and the hose wall 1. As long as it does not hinder the change in color, it can be set arbitrarily.

  Furthermore, while taking into consideration that the hose wall 1 does not deteriorate visibility, a ground wire may be embedded, or an antistatic function may be imparted by applying or mixing an antistatic agent. These functional materials may be embedded, applied or mixed.

  1 .... hose wall 2 .... reinforcing core 3 .... outer layer 4 .... inner layer 5 .... intermediate layer

Claims (4)

  A transport hose for transporting solids and fluids, which is a colored translucent outer layer (3), a colored translucent inner layer (4), and these outer layers (3 ) And an inner layer (4), and a synthetic resin hose wall (1) formed by laminating a colorless or colored translucent intermediate layer (5). The intermediate layer (5) is embedded with a colorless or colored translucent synthetic resin reinforcing core (2), and the outer layer (3), the inner layer (4), and the intermediate layer. The color of (5) is made different, and the colors of the intermediate layer (5) and the reinforcing core (2) are the same, depending on the degree of wear of the outer layer (3) and the degree of wear of the inner layer (4). A hose for transportation having a wear detection function, wherein the color of the hose wall (1) is changed.   The wear detection function according to claim 1, wherein the outer layer (3) is yellow transparent, the inner layer (4) is blue transparent or red transparent, and the intermediate layer (5) and the reinforcing core (2) are colorless and transparent. Transportation hose having. The intermediate layer in a state where the thickness of the outer layer (3) is uniform over the entire circumference, the thickness of the inner layer (4) is uniform over the entire circumference, and the reinforcing core (2) is embedded. The transport hose having a wear detection function according to claim 1 or 2, wherein the thickness of (5) is uniform over the entire circumference.   The transport hose according to any one of claims 1 to 3, wherein the reinforcing core (2) is embedded so as to be within the thickness of the intermediate layer (5).