WO2011033796A1

WO2011033796A1 - Transport hose having wear detection function

Info

Publication number: WO2011033796A1
Application number: PCT/JP2010/052920
Authority: WO
Inventors: 喜代志池山; 康博菊森; 達也町野; 慶治中俣; 一行南; 洋一郎月江; 史和松下
Original assignee: 東拓工業株式会社
Priority date: 2009-09-18
Filing date: 2010-02-25
Publication date: 2011-03-24
Also published as: JP2011064305A; CN102483190A; CN102483190B; JP5413657B2

Abstract

Provided is a transport hose having a wear detection function which is capable of simply and reliably detecting the degree of wear of the outer surface and the inner surface of a hose wall only by visual inspection from the outside. This transport hose serves to transport solid matter or fluid matter and is provided with a hose wall (1) made of synthetic resin and formed by laminating a yellow transparent outer layer (3) and a blue transparent or red transparent inner layer (4). It is configured in such a way that the color of the hose wall (1) gradually changes according to the degree of wear of the outer layer (3) and that of the inner layer (4).

Description

Transportation hose with wear detection function

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

Generally, in a synthetic resin transport hose 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 a problem in advance, it is a common practice to periodically replace the hose. In this case, it is difficult to properly predict the replacement time of the hose, the progress of wear is faster than expected, and the hose is cracked or broken before replacement, or a fully usable hose is replaced. There was a problem such as.

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 transportation hose, for example, as disclosed in Patent Document 1, a hose wall having a multilayer structure in which the colors of the outer layer and the inner layer are different is known. In this transport hose, the inner layer is exposed on the outer surface side of the hose wall due to wear of the outer layer of the hose wall, and the outer layer is exposed on the inner surface side of the hose wall due to wear of the inner layer of the hose wall. The wear on the side and the inner surface side can be detected.

Further, as disclosed in, for example, Patent Document 2, it is also known that the outer layer and the inner layer in the multi-layered hose wall are made transparent and the inner layer is colored. In this transport hose, as wear of the inner layer of the hose wall progresses, the color of the inner layer fades at the worn part and the color of the hose wall gradually changes. The degree of wear on the inner surface side of the hose wall can be detected by checking visually.

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. However, 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.

Furthermore, sufficient consideration has not been taken until the detection of the degree of wear on the outer surface 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.

Accordingly, the present invention eliminates the above-mentioned problems and has a wear detection function that can easily and reliably detect 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. The purpose is to provide.

In order to solve the above problems, a transport hose having a wear detection function according to the present invention is for transporting solids and fluids, and has an outer layer 3 having colored translucency and an outer side thereof. The hose wall 1 is made of a synthetic resin formed by laminating a colored translucent inner layer 4 having a color different from that of the layer 3, depending on the degree of wear of the outer layer 3 and the degree of wear of the inner layer 4. The color of the hose wall 1 is changed. Note that “having translucency” means a transparent or translucent state.

Specifically, the color of the outer layer 3 is yellow, and the color of the inner layer 4 is blue or red.

Further, an intermediate layer 5 having colorless or colored translucency is interposed between the outer layer 3 and the inner layer 4 in the hose wall 1, and the intermediate layer 5 has colorless or colored translucency. The reinforcing core 2 made of synthetic resin is embedded, and the colors of the outer layer 3, the inner layer 4 and the intermediate layer 5 are made different, and the colors of the intermediate layer 5 and the reinforcing core 2 are made the same. Further, 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. Furthermore, the thickness of the outer layer 3 is made uniform over the entire circumference, the thickness of the inner layer 4 is made uniform over the entire circumference, and the intermediate layer 5 is embedded with the reinforcing core 2 embedded therein. The thickness 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.

Further, a reinforcing core 2 is spirally wound around the hose wall 1 with a space in the hose axial direction. Further, the reinforcing core 2 is provided on the outer layer 3 so as to be separated from the outer peripheral surface of the inner layer 4. The reinforcing core 2 is translucent. Furthermore, the inner half of the reinforcing core 2 is tapered toward the center of the hose.

Further, at least one of the outer layer 3 or the inner layer 4 is formed by laminating a plurality of

colored layers

4A and 4B having translucency with different colors. Furthermore, at least one of the outer layer 3 or the inner layer 4 is configured such that the thick portions 3a and the thin portions 3b are alternately continued in the hose axial direction.

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 proceeds, the color of the inner layer gradually fades at the worn portion, and the color of the hose wall gradually changes. As a result, it is possible not only to detect a certain amount of wear on the outer surface side and the inner surface side of the hose wall, but also to detect the degree of wear on the outer surface side and the inner surface side of the hose wall simply by checking the color of the hose wall by visual inspection from the outside. Can be easily detected. 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.

In addition, the color of the outer layer is a yellow system with a high lightness, and the color of the inner layer is a blue system or a red system with a lightness lower than that of the yellow system. By doing so, the change in the color of the hose wall with the progress of 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 ensured even in an environment such as a dark place. Can be detected.

In addition, a colorless or colored light-transmitting 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, so that 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.

Furthermore, the thickness of the outer layer, the inner layer, and the intermediate layer in which the reinforcing core is 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 The wall can be colored without any spots over the entire circumference, and the change in the color of the hose wall can be seen even better.

Further, when reinforcing the hose wall by spirally winding the reinforcing core, the reinforcing core provided on the outer layer is separated from the outer peripheral surface of the inner layer, or a reinforcing core having translucency is used. By tapering the inner half of the hose wall, it is easy to see the vicinity of the back side of the reinforcing core in the hose wall, reducing the poor visibility due to the provision of the reinforcing core, and the degree of wear on the inner side of the hose wall It is possible to prevent the detection of the trouble.

Furthermore, by configuring the outer layer and / or the inner layer by laminating a plurality of colored layers having translucency with different colors, the change in the color of the hose wall at the time of wear is given an emphasis, A change in the color of the hose wall can be visually recognized.

Furthermore, by providing the outer layer and / or the inner layer with thick wall portions and thin wall portions that continue alternately in the hose axial direction, a pattern due to the difference in density between the thick wall portion and the thin wall portion appears on the hose wall. Therefore, gradation can be given as a whole, and the design of the hose can be improved.

It is a partially broken front view of the transportation hose which concerns on 1st Embodiment. It is the principal part expanded sectional view similarly. It is an important section expanded sectional view showing the modification similarly. It is a partially broken front view of the transportation hose which concerns on 2nd Embodiment. It is a partially broken front view of the transportation hose which concerns on 3rd Embodiment. It is a partially broken front view of the transportation hose which concerns on 4th Embodiment. It is a partially broken front view which shows the modification similarly. Similarly, it is a partially broken front view showing another modification. It is a partially broken front view which shows the other modification similarly.

(First embodiment)
The transport hose according to the first embodiment of the present invention is for transporting solids such as plastic pellets, for example. As shown in FIGS. 1 and 2, the hose wall 1 made of synthetic resin is used. The reinforcing core 2 made of synthetic resin 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 outer layer 3 has a uniform thickness in the hose radial direction over the entire circumference, and 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). Is formed. The inner layer 4 has a uniform thickness in the hose radial direction over the entire circumference, and 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 composed 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. Both the intermediate layer 5 and the reinforcing core 2 are colorless and transparent. The intermediate layer 5 with the reinforcing core 2 embedded therein has a uniform thickness in the hose radial direction over the entire circumference, and is colorless and transparent over the entire 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, such as an olefin resin and a urethane resin, not only a vinyl chloride 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 above 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 begins to wear, the inner layer 4 becomes thinner at the worn portion, and the blue color of the inner layer 4 becomes lighter. 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 progresses, 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.

Also, the outer surface side of the hose wall 1, that is, the outer layer 3 may be worn due to friction between the hoses and 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.

As 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 at the worn portion. 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. According to the degree, the color of the hose wall 1 gradually changes. Thus, by merely confirming the color of the hose wall 1 by visual inspection from the outside, it is possible not only to detect a certain amount of wear on the outer surface side and the inner surface side of the hose wall 1, but also to easily detect the degree of wear. Can do. 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 change in the color 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.

In the transportation hose according to the first embodiment, various changes and improvements may be made. For example, 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, 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 red transparent instead of blue transparent. In this case, the hose wall 1 becomes orange transparent with no spots over the entire circumference, and the orange to yellow color varies depending on the degree of wear of the inner layer 4. Gradually changing from orange to red according to the degree of wear of the outer layer 5. In this case as well, the same effects as when the inner layer 4 is blue transparent are obtained.

Furthermore, as shown in FIG. 3, the outer layer 3 and / or the inner layer 4 may be configured by laminating a plurality of

colored layers

4A and 4B having translucency with different colors. In this case, the color of the hose wall 1 changes well when worn.

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 visibility of the hose wall 1 is not deteriorated, a net-like reinforcing thread is embedded, a ground wire is embedded, or an antistatic agent is applied or mixed to prevent charging. Functions may be imparted, and other functional materials may be embedded, applied, or mixed.

(Second Embodiment)
In the transportation hose according to the second embodiment of the present invention, as shown in FIG. 4, the intermediate layer 5 in a state where the reinforcing core 2 is embedded in the hose wall 1 is eliminated. The hose wall 1 is formed by polymerizing and laminating a yellow transparent outer layer 3 and a blue transparent inner layer 4 in the hose radial direction. The thickness of the inner layer 4 in the hose radial direction is set to 20 to 80% of the thickness of the hose wall 1 in the hose radial direction. A colorless and transparent reinforcing core 2 is spirally wound and integrated with the outer peripheral surface of the outer layer 3 of the hose wall 1 at intervals in the hose axial direction.

The reinforcing core 2 has a substantially oval cross section in the hose radial direction, and the lateral width in the hose axial direction at the inner half of the reinforcing core 2 is gradually reduced toward the hose center. That is, the inner half of the reinforcing core 2 in the hose radial direction is tapered toward the hose center. The cross-sectional shape of the reinforcing core 2 in the hose radial direction is not limited to a substantially elliptical shape, and may be any shape such as a substantially circular shape or a substantially polygonal shape. Further, the reinforcing core 2 may be colored with translucency instead of being colorless and transparent, or one having no translucency may be used.

The transportation hose having the above configuration 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, a material in which a yellow pigment such as condensed azo is mixed 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 inner layer 4. 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. Thereby, the hose wall 1 formed by polymerizing and laminating the outer layer 3 and the inner layer 4 is manufactured.

Finally, a reinforcing core 2 is formed by extruding a hard vinyl chloride resin pellet with an extruder, and the reinforcing core 2 is spaced on the outer peripheral surface of the outer layer 3 of the hose wall 1 in the hose axial direction. While spirally wound. Then, the outer layer 3, the inner layer 4, and the reinforcing core 2 are heat-melted to each other using the heat of the inner layer constituting band extruded from the extruder, the outer layer constituting band, and the reinforcing core 2. A hose is manufactured by attaching and integrating. In the production of the hose, not only the inner layer-constituting strip, the outer layer-constituting strip, and the reinforcing core 2 are separately extruded and wound spirally, but these are integrated by a co-extruder. It may be extruded and wound spirally.

Also in the transport hose according to the second embodiment, as in the transport hose according to the first embodiment, the outer surface side and the inner surface of the hose wall 1 can be confirmed only by visually checking the color of the hose wall 1 from the outside. It is possible not only to detect a certain amount of wear on the side, but also to easily and reliably detect the degree of wear.

In addition, since the reinforcing core 2 is spirally wound around the hose wall 1, the vicinity of the back side of the reinforcing core covered with the reinforcing core 2 (the vicinity of the back side of the reinforcing core is high in rigidity and poor in elasticity. However, since the reinforcing core 2 is colorless and transparent, the color change in the vicinity of the back side of the reinforcing core can be seen well through the reinforcing core 2. Further, the reinforcing core 2 is provided on the outer peripheral surface of the outer layer 3 so as to be separated from the outer peripheral surface of the inner layer 4, and the inner half of the reinforcing core 2 is tapered, so that the reinforcement Even if the core 2 does not have translucency, the color change near the back side of the reinforcing core can be visually recognized by looking through the gap between the reinforcing cores 2 adjacent in the hose axial direction from the oblique direction.

Other configurations are the same as those of the first embodiment. In FIG. 4, members having the same functions as those of the first embodiment are denoted by the same reference numerals. Moreover, you may employ | adopt suitably the various change and improvement in 1st Embodiment with respect to said transport hose.

(Third embodiment)
As shown in FIG. 5, the transport hose according to the third embodiment has the thick portions 3 a and the thin portions 3 b alternately arranged in the hose axial direction in the outer layer 3, and the inner layer 4 has a thickness. It is substantially constant over substantially the entire length in the hose axial direction. The reinforcing core 2 has a substantially square cross-sectional shape in the hose radial direction.

Both the thick part 3a and the thin part 3b of the outer layer 3 are continuously formed in a spiral along the outer peripheral surface of the inner layer 4, and the thick part 3a is disposed along the reinforcing core 2. The thin portion 3b is pressed by the reinforcing core 2. Therefore, although the hose wall 1 is generally green and transparent, a spiral pattern due to the difference in yellow density between the thick portion 3a and the thin portion 3b of the outer layer 3 emerges. In particular, gradation is given.

Thereby, the degree of wear on the outer surface side and the inner surface side of the hose wall 1 can be easily and reliably detected only by visual inspection from the outside, and the design of the hose can be enhanced by gradation of the hose wall 1. it can.

Other configurations are the same as those of the second embodiment. In FIG. 5, members having the same functions as those of the second embodiment are denoted by the same reference numerals.

(Fourth embodiment)
In the transport hose according to the fourth embodiment, as shown in FIG. 6, the reinforcing core 2 is spirally wound inside the outer layer 3 of the hose wall 1 at intervals in the hose axial direction. The reinforcing core 2 has a substantially elliptical shape in which the cross-sectional shape in the hose radial direction is long in the hose axial direction. In this case, in the hose wall 1, a spiral pattern by the embedded reinforcing core 2 emerges, and a gradation is generally given.

As a modification, as shown in FIG. 7, the reinforcing core 2 may be spirally wound inside the inner layer 4 of the hose wall 1 with an interval in the hose axial direction. The reinforcing core 2 has a substantially circular cross-sectional shape in the hose radial direction. Also in this case, in the hose wall 1, a spiral pattern by the embedded reinforcing core 2 emerges, and a gradation is generally given.

Further, as shown in FIG. 8, between the outer layer 3 and the inner layer 4 in the hose wall 1, the reinforcing core 2 is spirally wound with a space in the hose axial direction, and the outer peripheral surface of the hose wall 1 is Concavities and convexities that are alternately continuous in the hose axis direction may be formed. The reinforcing core 2 has a substantially circular cross-sectional shape in the hose radial direction. Also in this case, in the hose wall 1, a spiral pattern by the embedded reinforcing core 2 emerges, and a gradation is generally given.

Further, as shown in FIG. 9, the reinforcing core 2 is spirally wound inside the outer layer 3 of the hose wall 1 with an interval in the hose axial direction, and the hose wall 1 in the hose axial direction on the inner and outer peripheral surfaces. You may form the alternately continuous unevenness | corrugation. The reinforcing core 2 has a substantially semicircular cross-sectional shape in the hose radial direction on the outer half, a substantially triangular cross-sectional shape in the hose radial direction on the inner half, and has a cross-sectional shape in the hose radial direction as a whole. It is almost fan-shaped. Also in this case, in the hose wall 1, a spiral pattern by the embedded reinforcing core 2 emerges, and a gradation is generally given. And since the unevenness | corrugation is formed in the internal peripheral surface of the hose wall 1, it is hard to raise | generate a streamer and it can suppress sticking to the internal peripheral surface of the hose wall 1 of the plastic pellet which flows the inside of the hose wall 1. FIG.

Other configurations are the same as those of the second embodiment. In FIGS. 6, 7, 8, and 9, members having the same functions as those of the second embodiment are denoted by the same reference numerals.

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.

1 ... Hose wall 2 .... Reinforcement core 3 .... Outer layer 3a ... Thick part 3b ... Thin part 4 ....

Inner layer

4A, 4B ... Colored layer 5, ... Intermediate layer

Claims

A transport hose for transporting solids and fluids, which has a colored translucent outer layer (3) and a colored translucent inner layer having a different color from the outer layer (3) A hose wall (1) made of a synthetic resin formed by laminating a layer (4), and depending on the degree of wear of the outer layer (3) and the degree of wear of the inner layer (4), the hose wall (1 A transport hose having a wear detection function, characterized in that the color of () is changed.
The transport hose according to claim 1, wherein the color of the outer layer (3) is yellow, and the color of the inner layer (4) is blue or red.
Between the outer layer (3) and the inner layer (4) in the hose wall (1), an intermediate layer (5) having colorless or colored translucency is interposed, and this intermediate layer (5) A reinforced core (2) made of synthetic resin having colorless or colored translucency is embedded, and the outer layer (3), the inner layer (4) and the intermediate layer (5) are made different in color, The transport hose having a wear detection function according to claim 1 or 2, wherein the colors of the intermediate layer (5) and the reinforcing core (2) are the same.
The wear detection function according to claim 3, wherein the outer layer (3) is transparent in yellow, the inner layer (4) is transparent in blue or red, 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 transportation hose having a wear detection function according to claim 3 or 4, wherein the thickness of (5) is uniform over the entire circumference.
The transport hose according to any one of claims 3 to 5, wherein the reinforcing core (2) is embedded so as to be within the thickness of the intermediate layer (5).
The transport hose having a wear detection function according to claim 1 or 2, wherein the reinforcing core (2) is spirally wound around the hose wall (1) at intervals in the hose axial direction.
The transport hose having a wear detection function according to claim 7, wherein the reinforcing core (2) is provided on the outer layer (3) so as to be separated from the outer peripheral surface of the inner layer (4).
The transporting hose having a wear detection function according to claim 7 or 8, wherein the reinforcing core (2) has translucency.
The transport hose according to any one of claims 7 to 9, wherein the inner half of the reinforcing core (2) is tapered toward the center of the hose.
The at least one of the outer layer (3) and the inner layer (4) is formed by laminating a plurality of colored layers (4A) (4B) having translucency with different colors. Transport hose with wear detection function.
The at least one of the outer layer (3) and the inner layer (4) has a thick portion (3a) and a thin portion (3b) alternately arranged in the hose axial direction. A transport hose having the wear detection function according to any one of the above.