JP2010023996A - Conveyor belt and method for recapping conveyor belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveyor belt allowing for efficiently peeling off a cover rubber without making a surface of a body belt irregular and exposing a steel cord in recapping the conveyor belt after using it, and to provide a method for recapping the conveyor belt. <P>SOLUTION: This conveyor belt 1 includes: the body belt 5 in which the steel cord 3 is buried as a reinforcing core body; and the cover rubber 9 arranged at least on the side of a carrying surface 7 of the body belt 5. At least two layers of fiber layers 11a, 11b and at least one layer of a rubber layer 13 are alternately laminated and arranged in the inside of the cover rubber 9. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a conveyor belt including a main body belt in which a steel cord is embedded as a reinforcing core, and a cover rubber disposed on at least a conveyance surface side of the main body belt. The present invention also relates to a method for recapping a conveyor belt comprising a main body belt in which a steel cord is embedded as a reinforcing core, and a cover rubber disposed on at least a conveying surface side of the main body belt.

  In recent years, there has been a strong demand for extending the service life of products from the viewpoint of environmental problems and resource saving. Conveyor belts are no exception. Conveyor belts have different service life for each part, so it is possible to recap cover rubber that has a shorter service life than other parts such as body belts with reinforcing cores. The service life is extended. This cover rubber recapping is carried out by removing only the worn or damaged cover rubber and then reapplying and vulcanizing a new unvulcanized cover rubber.

  By the way, in order to recap the cover belt, it is necessary to remove the worn cover rubber, but conventionally, the cover rubber has been mainly removed by buffing. This buffing is done manually according to the wear and damage state of the cover rubber, so it takes a lot of time and labor, and it is a skilled work to finish the removal surface smoothly without damaging the reinforcing core. Need.

On the other hand, in Patent Document 1, as shown in FIG. 10A, these cover rubbers are provided by arranging a canvas 101 at the boundary between the cover rubber part 109 and the belt main body part 105 having the steel cord 103. A technique that weakens the coupling force between the portion 109 and the belt main body portion 105 and enables the cover rubber portion 109 to be easily peeled off is disclosed.
Japanese Utility Model Publication No. 2-64508

  However, in the conveyor belt disclosed in Patent Document 1, as shown in the figure, the thickness of the cover rubber portion 109 after use is non-uniform due to wear or the like, so that the canvas 101 is removed from the belt main body portion. When the cover rubber part 109 is peeled off so as to remain in 105, there is a problem that the cover rubber part 109 is cut off at the thinned part and cannot be removed efficiently. Further, when the cover rubber part 109 is peeled off, a sufficient amount of rubber cannot be left on the canvas 101, and the adhesion with the new cover rubber part 109 becomes insufficient or non-uniform. There is a fear.

  Further, when the cover rubber part 109 is peeled off together with the canvas 101 in order to avoid such a torn problem, the surface of the belt main body part 105 becomes uneven as shown in FIG. There is a problem that the surface to be applied before 109 has to be buffed smoothly. Further, when the cover rubber portion 109 is peeled off, the steel cord 103 may be exposed. In this case, the steel cord 103 may be damaged by the buffing process.

  Therefore, the object of the present invention is to solve these problems. The purpose of the present invention is to make the surface of the main body belt uneven or expose the steel cord when the cover rubber after use is recapped. It is an object of the present invention to provide a conveyor belt and a recapping method that can efficiently peel off a cover rubber without causing a trouble.

  In order to achieve the above object, the present invention provides a conveyor belt comprising a main body belt in which a steel cord is embedded as a reinforcing core, and a cover rubber disposed at least on the conveying surface side of the main body belt. It is a conveyor belt characterized in that at least two fiber layers and at least one rubber layer are alternately laminated inside.

  In such a conveyor belt, since the rubber layer is formed between at least two fiber layers arranged in the cover rubber, the cover rubber is transported while leaving the fiber layer closer to the steel cord. The rubber layer is torn by peeling together with the side fiber layer, and the cover rubber is removed.

  Therefore, according to the conveyor belt of the present invention, since the cover rubber can be peeled off together with the fiber layer, time and labor can be saved significantly compared to the case where the cover rubber is removed by buffing, and the skill can be reduced. There is no need for work. Further, since the cover rubber is peeled off together with the fiber layer, the cover rubber is not broken off in the middle and can be peeled off efficiently. Furthermore, since the rubber layer between the two fiber layers is torn and the cover rubber is removed, a sufficient amount of rubber can be left on the fiber layer to ensure sufficient and uniform adhesion with the new cover rubber. In addition, the tear surface is not uneven enough to require repair, and the steel cord is not exposed.

  By the way, in the conveyor belt of this invention, it is preferable that the fiber layer is made of canvas. Here, “canvas” refers to a woven fabric formed by weaving fibers.

  Moreover, in the conveyor belt of the present invention, it is preferable that at least the fiber layer located at the most transport side among the at least two fiber layers is divided into a plurality of parts in the longitudinal direction of the conveyor belt.

  Furthermore, in the conveyor belt according to the present invention, it is preferable that at least the fiber layer located closest to the conveying surface among the at least two fiber layers is divided into a plurality in the width direction of the conveyor belt.

  Furthermore, in the conveyor belt according to the present invention, it is preferable that at least the fiber layer located closest to the conveying surface among the at least two fiber layers extends over the entire width of the conveyor belt.

  Furthermore, in the conveyor belt according to the present invention, at least three fiber layers and at least two rubber layers are alternately laminated in the cover rubber, and the tear strength of the rubber layer is set to be lower toward the conveying surface side. It is preferable.

  In the conveyor belt of the present invention, the rubber layer includes two high tear rubber members disposed adjacent to the fiber layer and having a relatively high tear strength, and the high tear rubber disposed between the high tear rubber members. It is preferable to comprise a low tear rubber member having a tear strength lower than that of the member.

  In order to achieve the above object, the present invention provides a main body belt in which a steel cord is embedded as a reinforcing core, a cover rubber disposed at least on the conveying surface side of the main body belt, and disposed in the cover rubber. When the cover rubber of the conveyor belt provided with the rubber layer formed between the fiber layers by the at least two fiber layers formed is recapted, the rubber layer between the two fiber layers is torn, and the steel layer of the fiber layers A step of peeling off the other fiber layer together with at least a part of the cover rubber while leaving one fiber layer close to the cord on the conveyor belt, and at least a part of the cover rubber was peeled off and remained on the conveyor belt And a step of attaching a cover rubber for recapping to the remaining portion of the conveyor belt. It is a recap method of the belt.

  The conveyor belt recapping method of the present invention preferably includes a step of disposing a fiber layer for forming a rubber layer again between the fiber layer remaining in the remaining portion of the conveyor belt.

  Further, in the method for recapping a conveyor belt according to the present invention, when the cover rubber for recapping is bonded to the remaining portion of the conveyor belt, at least a fiber layer that forms a rubber layer again with the fiber layer remaining in the remaining portion is provided. It is preferable to attach a recapping cover rubber having one layer.

  According to this invention, when the cover rubber after use is recapped, the cover rubber can be efficiently peeled without the surface of the main body belt becoming uneven or exposing the steel cord.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a conveyor belt according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view similar to FIG. 1, illustrating a method for recapping the cover rubber of the conveyor belt shown in FIG. is there.

  As shown in FIG. 1, the conveyor belt 1 of this embodiment includes a main body belt 5 in which a steel cord 3 as a reinforcing core body is embedded, and a cover rubber 9 disposed on the conveying surface 7 side of the main body belt 5. Is provided. The cover rubber 9 may be provided not only on the conveying surface 7 side but also on the opposite side to the conveying surface 7.

  In the cover rubber 9, first and second two fiber layers 11a and 11b (here, the fiber layer on the conveying surface 7 side is the first fiber layer 11a, and the fiber layer on the steel cord side is the first fiber layer 11a). 2 and the rubber layer 13 are alternately stacked, and thus the rubber layer 13 is formed between the fiber layers 11a and 11b. The first and second fiber layers 11a and 11b can be composed of, for example, a woven fabric (canvas), a knitted fabric, a non-woven fabric, or the like. As the fiber material, natural fibers such as cotton and hemp, Examples thereof include inorganic fibers such as metal fibers and glass fibers, and organic fibers such as polyamide, polyester, polyethylene, polyurethane, polystyrene, polyfluoroethylene, polyacryl, polyvinyl alcohol, wholly aromatic polyester, and aramid. However, since the conveyor belt 1 is bent by a pulley (not shown) of the conveyor body with the steel cord 3 as a reinforcing core as a neutral shaft, it is preferable to use a stretchable fiber layer. Therefore, when the fiber layers 11a and 11b are made of woven fabric or knitted fabric, nylon is used to improve stretchability, the weaving structure and the warp / weft density are devised, or the fibers in the longitudinal direction of the conveyor belt 1 are used. Or an inclined bias structure. When the fiber layer 11a is made of canvas, it becomes easy to peel off due to its flexibility when part of the cover rubber 9 is peeled off together with the first fiber layer 11a with a winch or the like as will be described later. Therefore, there is no possibility that the fiber layer 11a is cut off in the middle.

  The first and second fiber layers 11a and 11b may be made of the same material or different materials. As an example of dissimilar materials, the bending at the pulley while the conveyor belt 1 goes around the conveyor body is more in the case where the steel cord 3 is on the inner peripheral side and the fiber layers 11a and 11b are on the outer peripheral side than in the opposite case. Since there are many, the fiber layer farther from the steel cord 3 can be made a material that is more resistant to fatigue due to expansion and contraction.

  Next, a method for recapping the worn cover rubber 9 will be described. First, as shown in FIG. 2 (a), a cut X reaching the rubber layer 13 formed between the first and second fiber layers 11 a and 11 b is made, for example, along the longitudinal direction of the conveyor belt 1. And the part 15 pinched | interposed into the notch | incision X of the cover rubber 9 is peeled using a winch etc. with the 1st fiber layer 11a. At this time, the rubber layer 13 not reinforced by the fiber layers 11a and 11b is torn, and the second fiber layer 11b close to the steel cord 3 remains on the conveyor belt 1 as shown in FIG. Next, as shown in FIG. 2 (c), an unvulcanized cover rubber 19 for recapping is pasted on the remaining portion 17 (recessed portion) of the conveyor belt 1 remaining after the cover rubber 9 is peeled off. Then vulcanize.

  According to this, since part of the cover rubber 9 can be peeled off together with the first fiber layer 11a, time and labor can be saved significantly compared to the case where the cover rubber 9 is removed by buffing, Also, no skill-intensive work is required. Further, since the cover rubber 9 is peeled off together with the first fiber layer 11a, the cover rubber 9 is not broken off in the middle and can be peeled off efficiently. Furthermore, since the rubber layer 13 between the two fiber layers 11a and 11b is torn and the cover rubber 9 is removed, a sufficient amount of rubber is left on the surface of the remaining fiber layer 11b, and a new cover rubber 9 and Sufficient and uniform adhesion can be ensured, and the tear surface does not become uneven enough to require repair, and the steel cord 3 is not exposed.

  Hereinafter, various preferred embodiments of the conveyor belt of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member similar to the conveyor belt of embodiment shown in previous FIG. 1 and 2, and the description is abbreviate | omitted.

  First, FIG. 3 is a sectional view along the longitudinal direction of a conveyor belt according to another embodiment of the present invention. As shown in this figure, the conveyor belt 1 of this embodiment includes a main body belt 5 in which a steel cord 3 as a reinforcing core body is embedded, and a cover rubber 9 disposed on the conveying surface 7 side of the main body belt 5. Is provided. First and second two fiber layers 11a and 11b are embedded in the cover rubber 9 from the conveying surface 7 side, and a rubber layer 13 is formed between the fiber layers 11a and 11b. And the 1st fiber layer 11a is divided | segmented into plurality in the longitudinal direction (left-right direction of FIG. 3) of the conveyor belt 1. As shown in FIG.

  According to the conveyor belt 1 of this embodiment, when local damage d (see FIG. 3 (a)) or the like occurs in the cover rubber 9, it is partially necessary as shown in FIG. 3 (b). Since the cover rubber 9 can be peeled off, it is possible to further improve the efficiency of recapping.

  FIG. 4 is a cross-sectional view along the width direction of a conveyor belt according to still another embodiment of the present invention. As shown in this figure, the conveyor belt 1 of this embodiment includes a main body belt 5 in which a steel cord 3 as a reinforcing core body is embedded, and a cover rubber 9 disposed on the conveying surface 7 side of the main body belt 5. Is provided. First and second two fiber layers 11a and 11b are embedded in the cover rubber 9 from the conveying surface 7 side, and a rubber layer 13 is formed between the fiber layers 11a and 11b. And the 1st fiber layer 11a is divided | segmented into plurality in the width direction (left-right direction of FIG. 4) of the conveyor belt 1. As shown in FIG.

  According to the conveyor belt 1 of this embodiment, when local damage d (see FIG. 4 (a)) or the like occurs in the cover rubber 9, it is partially necessary as shown in FIG. 4 (b). Since the cover rubber 9 can be peeled off, it is possible to further improve the efficiency of recapping. It goes without saying that the efficiency of recapping can be further increased by dividing the first fiber layer 11a into a plurality of portions in the longitudinal direction and the width direction.

  FIG. 5 is a sectional view taken along the width direction of a conveyor belt according to still another embodiment of the present invention. As shown in this figure, the conveyor belt 1 of this embodiment includes a main body belt 5 in which a steel cord 3 as a reinforcing core body is embedded, and a cover rubber 9 disposed on the conveying surface 7 side of the main body belt 5. Is provided. First and second two fiber layers 11a and 11b are embedded in the cover rubber 9 from the conveying surface 7 side, and a rubber layer 13 is formed between the fiber layers 11a and 11b. The first and second fiber layers 11 a and 11 b extend the entire width of the conveyor belt 1.

  According to the conveyor belt 1 of this embodiment, when part of the cover rubber 9 is peeled off together with the first fiber layer 11a, a cut X (see FIG. 2A) reaching the rubber layer 13 in advance is made in the cover rubber 9. Since it is not necessary, further recapping efficiency can be achieved.

  FIG. 6 is a cross-sectional view along the width direction of the conveyor belt 1 according to still another embodiment of the present invention. As shown in this figure, the conveyor belt 1 of this embodiment includes a main body belt 5 in which a steel cord 3 as a reinforcing core body is embedded, and a cover rubber 9 disposed on the conveying surface 7 side of the main body belt 5. Is provided. A third fiber layer 11c is embedded in the cover rubber 9 in addition to the first and second fiber layers 11a and 11b from the conveying surface 7 side, and two layers are provided between these fiber layers 11a, 11b and 11c. Rubber layers 13a and 13b are formed.

  According to the conveyor belt 1 of this embodiment, a part of the cover rubber 9 is peeled off together with the first fiber layer 11a, and even if the cover rubber 9 is recapped, the second and third fiber layers 11b and 11c are covered with the cover rubber. 9 can be left in place, so the recapping can be performed twice. As the number of fiber layers forming the rubber layer increases, the number of recaps that can be performed increases. Therefore, if four or more fiber layers and three or more rubber layers are alternately stacked, the number of recaps can be increased. An increase can be aimed at. Moreover, in the conveyor belt 1 of this embodiment, it is preferable that the tear strength of the rubber layers 13a and 13b formed between the fiber layers 11a, 11b, and 11c is set to be lower toward the conveyance surface 7 side. In this way, when performing recapping over a plurality of times, the rubber layer 13a closer to the conveying surface 7 side can be reliably (priorly) torn, and the other side closer to the steel cord 3 can be mistaken. There is no risk of tearing the rubber layer 13b.

  Fig.7 (a) is sectional drawing in alignment with the width direction of the conveyor belt of further another embodiment of this invention, FIG.7 (b) is an expanded sectional view of the conveyor belt of Fig.7 (a). As shown in this figure, the conveyor belt 1 of this embodiment includes a main body belt 5 in which a steel cord 3 as a reinforcing core body is embedded, and a cover rubber 9 disposed on the conveying surface 7 side of the main body belt 5. Is provided. First and second two fiber layers 11a and 11b are embedded in the cover rubber 9 from the conveying surface 7 side, and a rubber layer 13 is formed between the fiber layers 11a and 11b. The rubber layer 13 includes the high tear rubber members 21 and 21 that are disposed adjacent to the first and second fiber layers 11a and 11b and have a relatively high tear strength, that is, are difficult to tear. It has the low tear rubber member 23 which is arrange | positioned between the tear rubber members 21 and 21 and whose tear strength is lower than the high tear rubber members 21 and 21, ie, is easy to tear. The difference in tear strength between the high tear rubber members 21 and 21 and the low tear rubber member 23 measured according to JIS K6301B type is preferably 30 N / mm or less in consideration of the durability performance of the conveyor belt 1, which will be described later. From the viewpoint of surely causing such preferential tearing of the low tear rubber member 23, it is preferably 5 N / mm or more. In generating a difference in tear strength between the high tear rubber members 21 and 21 and the low tear rubber member 23, the tear strength of the high tear rubber members 21 and 21 may be increased, or the low tear rubber member 23 may be increased. For example, when reducing the tearing force of a rubber member, an inorganic filler such as calcium carbonate is blended in the rubber member, or in the case of blending NR / SBR Brent, the SBR ratio Can be raised.

  According to the conveyor belt 1 of this embodiment, when part of the cover rubber 9 is peeled off together with the first fiber layer 11a, the low tear rubber member 23 is preferentially torn, and the first remaining on the cover belt 9 is removed. On the surface of the second fiber layer 11b, a rubber material (high tear rubber member 21) that brings about excellent bonding with a new cover rubber 19 for recapping can reliably remain, and the cover rubber 19 for recapping and A high adhesive force can be ensured between the fiber layer 11b. In addition, since the low tear rubber member 23 can be preferentially torn, the tear surface can be smoothed. From this point of view, the thickness of the low tear rubber member 23 is set to be higher than that of the high tear rubber members 21, 21. If the thickness is smaller than the thickness, the unevenness of the tear surface caused by tearing can be made smaller.

  Next, a method for allowing the conveyor belt according to the present invention to be recapped a plurality of times will be described. Here, FIG. 8 is a cross-sectional view in the width direction of the conveyor belt, showing the conveyor belt recapping method according to the present invention.

  As shown in FIG. 8 (a), the conveyor belt 1 of this embodiment is disposed on a main body belt 5 in which a steel cord 3 as a reinforcing core is embedded, and on the conveying surface 7 side of the main body belt 5. Cover rubber 9 is provided. First and second two fiber layers 11a and 11b are embedded in the cover rubber 9 from the conveying surface 7 side, and a rubber layer 13 is formed between the fiber layers 11a and 11b.

  In FIG. 8 (b), a part of the cover rubber 9 that has been worn away by use is peeled off together with the first fiber layer 11a. In the above-described example, recapping is performed by bonding the recapping cover rubber 19 to the remaining portion 17 of the conveyor belt 1, but in this example, before the recapping cover rubber 19 is bonded, FIG. As shown in c), a new fiber layer 11d for re-forming the rubber layer 13 is disposed between the second fiber layer 11b remaining on the remaining portion 17 of the conveyor belt 1 and the second fiber layer 11b. The cover rubber 19 can be attached after the fiber layer 11d as a single body is disposed on the remaining portion 17 of the conveyor belt 1 as shown in FIG. When the new fiber layer 11d is disposed, a new fiber layer 11d is previously disposed in the cover rubber 19 like the recapping cover rubber 19 shown in FIG. The rubber layer 13 may be newly formed between the fiber layer 11b and the fiber layer 11b.

  According to this, when enabling a plurality of recaps, a large number of fiber layers 11a, 11b, and 11c are disposed in the cover rubber 9 in advance as in the conveyor belt 1 of the embodiment shown in FIG. Since it is not necessary, the rigidity of the conveyor belt 1 before and after the recapping can be kept constant.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described embodiments, and can be appropriately changed within the scope of the claims. The cover rubber having at least two arranged fiber layers and at least one rubber layer can be provided on the surface opposite to the conveying surface. 3 and 4, the fiber layer closest to the conveying surface has a split structure, but the fiber layer on the steel cord side can also have a split structure. In particular, this is advantageous in the case where three or more fiber layers and two or more rubber layers are alternately laminated to enable recapping twice or more.

  Thus, according to the conveyor belt and the conveyor belt recap method of the present invention, when the cover rubber after use is recapped, the cover rubber is efficiently removed without the surface of the main body belt becoming uneven or exposing the steel cord. It can be peeled off.

It is sectional drawing of the width direction of the conveyor belt of one Embodiment of this invention. FIG. 2 is a cross-sectional view similar to FIG. 1 for explaining a method of recapping the cover rubber of the conveyor belt shown in FIG. 1. It is sectional drawing which follows the longitudinal direction of the conveyor belt of other embodiment of this invention. It is sectional drawing which follows the width direction of the conveyor belt of further another embodiment of this invention. It is sectional drawing which follows the width direction of the conveyor belt of further another embodiment of this invention. It is sectional drawing which follows the width direction of the conveyor belt of further another embodiment of this invention. It is a figure which shows the conveyor belt of further another embodiment of this invention, (a) is sectional drawing which follows the width direction, (b) is an expanded sectional view which follows the width direction. It is width direction sectional drawing of the conveyor belt which shows the recapping method of the conveyor belt according to this invention. It is a cross-sectional view in the width direction of a cover rubber for recapping that can be suitably applied to the present invention. (A), (b) is sectional drawing which follows the width direction of the conveyor belt according to a prior art, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyor belt 3 Steel cord 5 Main body belt 7 Conveying surface 9 Cover rubber 11a, 11b, 11c, 11d Fiber layer 13, 13a, 13b Rubber layer 17 Remaining part of conveyor belt 19 New cover rubber 21 High tear rubber member 23 Low tear Rubber member

Claims (10)

In a conveyor belt comprising a main body belt in which a steel cord is embedded as a reinforcing core, and a cover rubber disposed on at least the conveying surface side of the main body belt,
A conveyor belt, wherein at least two fiber layers and at least one rubber layer are alternately laminated in the cover rubber.   The conveyor belt according to claim 1, wherein the fiber layer is made of canvas.   The conveyor belt according to claim 1 or 2, wherein a fiber layer located at least closest to the conveying surface among the at least two fiber layers is divided into a plurality of parts in a longitudinal direction of the conveyor belt.   The conveyor belt according to any one of claims 1 to 3, wherein a fiber layer positioned at least closest to the conveying surface among the at least two fiber layers is divided into a plurality of parts in a width direction of the conveyor belt. .   The conveyor belt according to any one of claims 1 to 4, wherein a fiber layer located at least closest to the conveyance surface among the at least two fiber layers extends over the entire width of the conveyor belt.   6. The cover rubber according to claim 1, wherein at least three fiber layers and at least two rubber layers are alternately laminated in the cover rubber, and the tear strength of the rubber layer is lower toward the conveying surface side. Conveyor belt as described in.   The rubber layer has two high tear rubber members disposed adjacent to the fiber layer and relatively high tear strength, and has a lower tear strength than the high tear rubber member disposed between the high tear rubber members. The conveyor belt as described in any one of Claims 1-6 comprised from a low tear rubber member. Formed between these fiber layers by a main body belt in which a steel cord is embedded as a reinforcing core, a cover rubber disposed at least on the conveying surface side of the main body belt, and at least two fiber layers disposed in the cover rubber The cover rubber of the conveyor belt provided with the rubber layer
Tearing the rubber layer between the two fiber layers, leaving one of the fiber layers close to the steel cord on the conveyor belt and stripping the other fiber layer together with at least part of the cover rubber; ,
A method of recapping the conveyor belt, comprising: attaching a cover rubber for recapping to a remaining portion of the conveyor belt that has been peeled off and remains on the conveyor belt.   The method for recapping a conveyor belt according to claim 8, comprising a step of disposing a fiber layer for forming the rubber layer again between the fiber layer remaining in the remaining portion of the conveyor belt.   When attaching a cover rubber for recapping to the remaining portion of the conveyor belt, a cover rubber for recapping having at least one fiber layer that forms the rubber layer again with the fiber layer remaining in the remaining portion. The method for recapping a conveyor belt according to claim 8 or 9, wherein the conveyor belts are bonded together.

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