JP2012218942A - Conveyor belt, and method for manufacturing the conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor belt which enables improved design flexibility.SOLUTION: The conveyor belt 1 includes a pair of cover rubber layers 2, an intermediate rubber layer 3 disposed between the cover rubber layers 2, and a plurality of steel cords 4 embedded in the intermediate rubber layer 3 to be spaced in a belt width direction H. The steel cord 4 is covered with an adhesive rubber film 5 formed of adhesive rubber, and also bonded to the intermediate rubber layer 3 through the adhesive rubber film 5.

Description

  The present invention relates to a conveyor belt and a method for manufacturing the conveyor belt.

  Conventionally, for example, a conveyor belt as shown in Patent Document 1 below is known. The conveyor belt includes a pair of cover rubber layers, an intermediate rubber layer disposed between the cover rubber layers, and a plurality of steels embedded in the intermediate rubber layer at intervals in the belt width direction. And a cord.

JP 2010-248427 A

  However, in the conventional conveyor belt, since the steel cord is bonded to the intermediate rubber layer, the intermediate rubber layer needs to be formed of an adhesive rubber having good adhesion to the steel cord. The choice of rubber material forming the belt was limited, and the design of the conveyor belt was limited.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the conveyor belt which can raise the freedom degree of design.

In order to solve the above problems, the present invention proposes the following means.
A conveyor belt according to the present invention includes a pair of cover rubber layers, an intermediate rubber layer disposed between the cover rubber layers, and a plurality of the rubber belts embedded in the intermediate rubber layer at intervals in the belt width direction. A steel belt that is coated with an adhesive rubber film formed of an adhesive rubber and is bonded to the intermediate rubber layer through the adhesive rubber film. It is characterized by being.

According to this invention, since the steel cord is bonded to the intermediate rubber layer via the adhesive rubber film, even if the intermediate rubber layer is formed of a rubber material different from the adhesive rubber, the steel cord is not bonded to the intermediate rubber layer. Can be securely bonded. Therefore, the range of selection of the rubber material for forming the intermediate rubber layer can be increased, and the degree of freedom in designing the conveyor belt can be increased.
In addition, as a rubber material for forming the intermediate rubber layer, when a rubber material whose cost is lower than that of the adhesive rubber is adopted, as compared with the case where the intermediate rubber layer is formed of the adhesive rubber as in the above-described prior art. The cost of the conveyor belt can be reduced.

  The intermediate rubber layer may be formed of a low physical property rubber.

  In this case, when the conveyor belt is formed in an endless belt shape having both end portions in the belt longitudinal direction, and at the time of so-called endless construction in which these both end portions are joined to form the conveyor belt in an endless belt shape. The workability can be improved. That is, at the time of endless construction, since the intermediate rubber layer is removed at both ends of the conveyor belt, when the intermediate rubber layer is formed of low physical property rubber, the intermediate rubber layer is adhesive rubber as in the prior art. Compared with the case where it is formed by, the workability of endless construction can be improved.

  The intermediate rubber layer may be formed of a high physical property rubber.

  In this case, since the intermediate rubber layer is formed of a high physical property rubber, the durability of the conveyor belt is improved as compared with the case where the intermediate rubber layer is formed of an adhesive rubber as in the prior art. Can be made.

  A conveyor belt manufacturing method according to the present invention is a conveyor belt manufacturing method for forming the conveyor belt, wherein an unvulcanized intermediate rubber member and an unvulcanized intermediate rubber member are interposed between a pair of unvulcanized cover rubber members. The steel cord covered with an unvulcanized rubber film member, and a vulcanizing step of vulcanizing by pressurizing them in the sandwiching direction, and before the vulcanizing step, the steel cord And a cord covering step of covering the surface with the rubber film member.

  According to this invention, since the cord coating step is provided before the vulcanization step, the steel cord can be coated with high precision by the rubber film member, and the steel cord is attached via the adhesive rubber. It can be securely bonded to the intermediate rubber layer.

With the conveyor belt according to the present invention, the degree of freedom in design can be increased.
Moreover, according to the method for manufacturing a conveyor belt according to the present invention, the steel cord can be reliably bonded to the intermediate rubber layer via the adhesive rubber.

It is sectional drawing of the conveyor belt which concerns on one Embodiment of this invention. It is sectional drawing explaining the manufacturing method of the conveyor belt which forms the conveyor belt shown in FIG. It is a top view explaining the endless construction in the conveyor belt shown in FIG. It is a top view explaining the endless construction in the conveyor belt shown in FIG. It is an enlarged top view explaining the endless construction in the conveyor belt shown in FIG.

Hereinafter, a conveyor belt according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the conveyor belt 1 includes a pair of cover rubber layers 2, an intermediate rubber layer 3 disposed between the cover rubber layers 2, and a belt width within the intermediate rubber layer 3. A plurality of steel cords 4 embedded in the direction H at intervals. In this embodiment, the conveyor belt 1 is formed in the shape of an end band having both ends in the belt longitudinal direction.

The cover rubber layer 2, the intermediate rubber layer 3, and the steel cord 4 all extend in the belt longitudinal direction. Further, the cover rubber layer 2 and the intermediate rubber layer 3 both have a single layer structure, and among these rubber layers 2 and 3, those adjacent in the belt thickness direction are vulcanized and bonded to each other. The conveyor belt 1 has a laminated structure in which three rubber layers are laminated as a whole.
The steel cord 4 is subjected to a surface treatment such as galvanization or brass plating.

In the present embodiment, the steel cord 4 is covered with an adhesive rubber film 5 formed of an adhesive rubber and bonded to the intermediate rubber layer 3 through the adhesive rubber film 5.
The adhesive rubber film 5 is formed in a cylindrical shape that covers the steel cord 4 over the entire length in the belt longitudinal direction, and the adhesive rubber film 5 that covers the steel cord 4 adjacent in the belt width direction H is an intermediate rubber layer 3. Are adjacent to each other in the belt width direction H.

Further, in each adhesive rubber film 5, each portion located on both sides in the belt width direction H is vulcanized and bonded to the intermediate rubber layer 3, and each portion located on both sides in the belt thickness direction is covered with the cover rubber. Each layer 2 is vulcanized and bonded, and the adhesive rubber film 5 is disposed in the intermediate rubber layer 3 in a state where the intermediate rubber layer 3 is vertically cut in the belt thickness direction.
The film thickness of the adhesive rubber film 5 is preferably about 0.5 mm to 2.0 mm, for example.

  Here, each of the cover rubber layer 2 and the intermediate rubber layer 3 is formed of a rubber material different from the adhesive rubber, and the cover rubber layer 2 is made of a durable rubber having excellent wear resistance and cut resistance. At the same time, the intermediate rubber layer 3 is made of low physical property rubber. In addition, the tensile strength and tear strength of the low physical property rubber are respectively lower than the tensile strength and tear strength of the adhesive rubber. The tensile strength of the low physical property rubber is about 1.5 to 8 MPa, for example. The tensile strength according to DIN 53507 of rubber is, for example, about 2 to 12 N / mm.

  The adhesive rubber that forms the adhesive rubber film 5 is a rubber material that has good adhesion to the steel cord 4 that has been surface-treated as described above and that forms the intermediate rubber layer 3. The low physical property rubber and the durable rubber which is a rubber material forming the cover rubber layer 2 can be vulcanized and bonded to each other. In the present embodiment, these adhesive rubber, low physical property rubber and durable rubber are, for example, natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), isoprene rubber. (IR) or chloroprene rubber (CR) or the like, or a mixture of two or more thereof is contained as a common main component.

Next, the manufacturing method of the conveyor belt which forms the said conveyor belt 1 is demonstrated.
First, as shown in FIG. 2, a cord covering process is performed in which the steel cord 4 is covered with an unvulcanized rubber film member 15 that becomes the adhesive rubber film 5 to form a covering cord 10. At this time, for example, the rubber film member 15 is formed by adhering an unvulcanized adhesive rubber to the steel cord 4 while pulling out the steel cord 4 from a cord reel on which the steel cord 4 is wound in advance. Thus, the covering cord 10 is formed.

Thereafter, the covering cord 10 and the unvulcanized intermediate rubber member 13 serving as the intermediate rubber layer 3 are sandwiched between the pair of unvulcanized cover rubber members 12 serving as the pair of cover rubber layers 2. Is pressed in the sandwiching direction B and vulcanized.
In the illustrated example, the intermediate rubber member 13 includes a pair of laminated members 13a that are sandwiched between the pair of cover rubber members 12 with a space therebetween.

  As described above, according to the conveyor belt 1 according to the present embodiment, the steel cord 4 is bonded to the intermediate rubber layer 3 via the adhesive rubber film 5, so that the intermediate rubber layer 3 is made of adhesive rubber. Even if they are made of different rubber materials, the steel cord 4 can be securely bonded to the intermediate rubber layer 3. Therefore, the range of selection of the rubber material for forming the intermediate rubber layer 3 can be increased, and the degree of freedom in designing the conveyor belt 1 can be increased.

In the case where the intermediate rubber layer 3 is formed of low physical property rubber as in the present embodiment,
The workability can be improved at the time of so-called endless construction in which both ends of the belt in the longitudinal direction are joined to form the conveyor belt 1 in an endless belt shape.

That is, at the time of endless construction, first, as shown in FIG. 3, a removal process is performed to remove the intermediate rubber layer 3 at both end portions 1 a in the belt longitudinal direction of the conveyor belt 1. At this time, both end portions 4 a of the steel cord 4 in the longitudinal direction of the belt are exposed from the intermediate rubber layer 3 while being covered with the adhesive rubber film 5.
Then, as shown in FIG. 4, the butting process which butts the said both ends 1a of the conveyor belt 1 is performed. At this time, the end 4a of the steel cord 4 exposed from the intermediate rubber layer 3 on the one end 1a side of the both ends 1a of the conveyor belt 1, and the steel cord 4 exposed from the intermediate rubber layer 3 on the other end 1a side. Are arranged alternately in the belt width direction H.
And, as shown in FIG. 5, by placing and vulcanizing an unvulcanized rubber member 14 to be the intermediate rubber layer 3 between the ends 4a of the steel cords 4 adjacent in the belt width direction H, The conveyor belt 1 is formed in an endless belt shape.

Here, in the present embodiment, as described above, since the intermediate rubber layer 3 is formed of low physical property rubber, the intermediate rubber layer 3 is manually operated without using a jig, for example, in the removing step. It becomes possible to remove easily by the above, and the workability of endless construction can be improved.
On the other hand, when the intermediate rubber layer is formed of adhesive rubber as in the prior art, it takes more time than when the intermediate rubber layer is formed of low physical property rubber.
In this case, in the removing step, only the intermediate portion between the ends of the steel cords adjacent to each other in the belt width direction in the intermediate rubber layer must be removed, which takes more time. Further, at this time, in order to remove the intermediate portion, for example, when the intermediate portion is cut out using a jig, it is necessary to work carefully so as not to damage the end portion of the steel cord with the jig. , It takes more time.

  In the present embodiment, the adhesive rubber films 5 covering the steel cords 4 adjacent in the belt width direction H are adjacent to each other in the belt width direction H via the intermediate rubber layer 3. The physical properties of the low physical property rubber, which is a rubber material forming the intermediate rubber layer 3, are more effective than the case where the intermediate rubber layer 3 is not interposed between them and the adhesive rubber films 5 are integrated. Can be successful.

  When a rubber material having a lower cost than the adhesive rubber is used as the low physical property rubber that is the rubber material forming the intermediate rubber layer 3, the intermediate rubber layer 3 is attached to the adhesive rubber as in the prior art. The cost of the conveyor belt 1 can be reduced as compared with the case of forming by.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the intermediate rubber layer 3 is formed of low physical property rubber, but is not limited thereto.
For example, the intermediate rubber layer 3 may be formed of high physical property rubber. The tensile strength and tear strength of the high physical property rubber are higher than the tensile strength and tear strength of the adhesive rubber, respectively. The tensile strength of the high physical property rubber is, for example, about 14 to 30 MPa.
In this case, the durability of the conveyor belt 1 can be improved as compared to the case where the intermediate rubber layer 3 is formed of an adhesive rubber as in the prior art.

  Moreover, in the said embodiment, although the adhesive rubber film 5 shall be arrange | positioned in this intermediate rubber layer 3 in the state which cut | interrupted the intermediate rubber layer 3 in the belt thickness direction, it is not restricted to this. . For example, the entire adhesive rubber film 5 may be disposed in the intermediate rubber layer 3.

Moreover, in the said embodiment, although the cover rubber layer 2 and the intermediate | middle rubber layer 3 were all having single layer structure, a laminated structure may be sufficient. In this case, each layer may be formed of different rubber materials.
Furthermore, in the said embodiment, although the conveyor belt 1 shall be formed in the end strip shape which has both ends in the belt longitudinal direction, an endless strip shape may be sufficient.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

1 Conveyor belt 2 Cover rubber layer 3 Intermediate rubber layer 4 Steel cord 5 Adhesive rubber film 12 Cover rubber member 13 Intermediate rubber member 15 Rubber film member B Insertion direction H Belt width direction

Claims (2)

A pair of cover rubber layers;
An intermediate rubber layer disposed between these cover rubber layers;
A plurality of steel cords embedded in the intermediate rubber layer at intervals in the belt width direction, and a conveyor belt comprising:
The conveyor belt, wherein the steel cord is covered with an adhesive rubber film formed of an adhesive rubber and is bonded to the intermediate rubber layer through the adhesive rubber film. A method of manufacturing a conveyor belt for forming the conveyor belt according to claim 1,
The unvulcanized intermediate rubber member and the steel cord covered with the unvulcanized rubber film member are sandwiched between a pair of unvulcanized cover rubber members, and these are pressed in the clamping direction. A vulcanization process to vulcanize,
A method of manufacturing a conveyor belt, comprising a cord coating step of coating the steel cord with the rubber film member before the vulcanization step.

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