JPH09183505A - Conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate maintenance and curtail the number of persons and the cost for maintenance by burying a reinforcing layer made of synthetic fiber textiles specifying cut-off elongation in the longitudinal direction and elongation at specified cutting load between the upper face cover and the lower face cover. SOLUTION: In this conveyor belt, a reinforcing layer 1 is buried between the upper face cover 2 and the lower face cover 3. In synthetic fiber textiles constituting the reinforcing layer 1, the cut-off elongation in the longitudinal direction is over 25%, and elongation in the longitudinal direction of the belt when a load equivalent to 10% of the cut-off load is applied in the longitudinal direction of the belt, namely elongation at 10% cut-off load is under 1.5%. By enlarging the cut-off elongation in the longitudinal direction of the belt of synthetic fiber textiles such as over 25%, in this way, the belt is apt to be deformed by a large load, and hence stress concentration can be softened. Further, by setting the elongation in the longitudinal direction at 10% cut-off load under 1.5%, the elongation in the longitudinal direction of the belt is restrained to be small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt reinforced with a synthetic fiber woven fabric, and more particularly to a conveyor belt which has a small elongation during long-term use and is less likely to be damaged by foreign matter.

[0002]

2. Description of the Related Art Conventionally, a woven fabric of nylon fibers or polyester fibers has been used for a reinforcing layer of a conveyor belt of this type. However, this conventional conveyor belt using nylon fabric or polyester fabric is damaged by abnormal deformation when foreign matter such as cake adhering to the pulley or dropped cargo is caught between the pulley and the conveyor belt. Even if the belt is easily deformed and abnormally deformed to such an extent that it is not directly damaged, the belt is damaged due to the decrease in strength due to fatigue when repeatedly subjected to such deformation, and it cannot withstand long-term use.

Further, in the conventional conveyor belt, elongation occurs with use and the total length of the belt becomes long. Therefore, the stroke of a take-up device provided in front of or behind the belt conveyor device is correspondingly increased. It was necessary to adjust the machine length back and forth, and when the elongation further advanced and the stroke of the take-up device could not absorb the elongation, it was necessary to trim the belt.

[0004]

SUMMARY OF THE INVENTION A means for reducing belt breakage and fatigue caused by abnormal deformation when foreign matter is caught between a pulley and a conveyor belt, and belt elongation caused by use at various angles. As a result of research from, regarding the damage and fatigue of the belt due to abnormal deformation, the cutting elongation in the belt longitudinal direction of the synthetic fiber woven fabric that constitutes the reinforcing layer is made as large as possible. It has been found that an effective means is to reduce the elongation of the synthetic fiber woven fabric in the longitudinal direction of the belt during use as much as possible.

The present invention has been devised in view of the above-mentioned conventional problems, and when foreign matter such as a cake adhering to a pulley or a dropped article is caught between the pulley and the conveyor belt, it is damaged. Conveyor belt that can be used for a long period of time, has a small overall length of the belt, does not require much adjustment of the machine length, does not need to trim the belt, and can shorten the stroke of the take-up device. It is intended to provide and reduce the personnel and cost of maintenance of the conveyor belt.

[0006]

In order to achieve the above object, the present invention embeds a reinforcing layer made of a synthetic fiber woven fabric between an upper cover and a lower cover, so that the cutting elongation in the longitudinal direction of the synthetic fiber woven fabric is increased. The elongation is 25% or more and the elongation at 10% of the cutting load is 1.5% or less.

The warp of the synthetic fiber fabric has a cutting elongation of 2
A thread made of 5% or more of high elongation polyester or high elongation nylon can be used. The synthetic fiber woven fabric may be a woven fabric in which warp yarns made of polyester fibers and warp yarns made of nylon fibers are alternately arranged every one to three yarns. The cutting elongation of the warp in this case may be less than 25%.

As the warp yarn of the synthetic fiber woven fabric, a yarn obtained by mixing and twisting polyester fiber and nylon fiber can be used. In this case, as the fiber material, high elongation or general polyester, and high elongation or general nylon can be used. The yarn used for the synthetic fiber woven fabric is preferably treated with an adhesive liquid, and in this case, the temperature of the adhesive liquid of the warp yarn is preferably 200 ° C. or higher. In addition, the tension applied to the yarn during the treatment of the adhesive solution, that is, the set tension is preferably as low as 0.2 g /
It is preferably denier or less, and may be zero. As the synthetic fiber woven fabric, a woven fabric having a structure in which warp yarns and weft yarns are linearly arranged and entwined with entwined yarns, that is, a so-called Unicon woven fabric is suitable.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing the structure of a conveyor belt according to the present invention, in which a reinforcing layer 1 is embedded between an upper cover 2 and a lower cover 3. The upper surface cover 2 and the lower surface cover 3 are made of a flexible material such as rubber, synthetic rubber or synthetic resin, and the reinforcing layer 1 is made of a synthetic fiber woven fabric. The upper cover 2, the reinforcing layer 1, and the lower cover 3 are adhered to each other.

The synthetic fiber fabric constituting the reinforcing layer 1 is
The longitudinal cutting elongation is 25% or more, and the longitudinal elongation of the belt when a load corresponding to 10% of the cutting load is applied in the longitudinal direction of the belt, that is, 10% load of the cutting load. The elongation at time is 1.5% or less. The material of the warp of the synthetic fiber fabric has a cutting elongation of 25 in the untreated raw yarn.
% Or more of high elongation polyester fiber or high elongation nylon fiber is a preferable material, and by using the raw yarn of these materials, the breaking elongation in the longitudinal direction is 25% or more and 10% or more.
A woven fabric having an elongation under load of 1.5% or less can be obtained.

In the synthetic fiber woven fabric, one to three warp yarns made of polyester fiber and nylon fiber are provided.
A good synthetic fiber woven fabric suitable for the present invention can be obtained by using a woven fabric arranged alternately for each book. This is because the polyester fiber acts to reduce the elongation at 10% load and the nylon acts to increase the elongation at break. However, if four or more warp yarns of the same material are continuously arranged, the flatness of the belt may be lost.

The polyester fiber and nylon fiber in this case may have a cutting elongation of 25% or less. The warp of the polyester fiber and the warp of the nylon fiber may not be the same in number, and may be arranged, for example, in a ratio of 1: 2 or 1: 3. Furthermore, even if a twisted yarn of polyester fiber and nylon fiber is used as the warp of the synthetic fiber woven fabric, a good synthetic fiber woven fabric suitable for the present invention can be obtained by the same action as the above action.

As the weft yarn of the synthetic fiber woven fabric, a yarn made of fibers such as polyester and nylon is used, and the cutting elongation thereof is preferably 30% to 80%, and less than 25%,
Often the weft thread is cut before the warp thread is cut. The warp yarns and the weft yarns of the synthetic fiber woven fabric are preferably subjected to an adhesive liquid treatment in order to adhere the upper cover 2, the reinforcing layer 1 and the lower cover 3 to each other, but in this case, the adhesion is good,
In order to keep the cutting elongation of the warp yarn after the treatment good, the temperature of the treatment liquid for the warp yarn is 200 ° C or higher, preferably 200 ° C to 240 ° C.
Good results are obtained at ° C.

The adhesive solution treatment is carried out while applying a slight tension to the yarn. If the tension in this case, that is, the set tension is 0.2 g / denier or less, the cutting elongation of the warp yarn after the treatment is increased. You can keep better. Note that the warp set tension may be zero. The woven structure of the reinforcing layer used in the present invention is not particularly specified, but a structure in which the weft 12 is entangled with each warp yarn 11 shown in FIG. 6, and the weft 14 is provided with every two warp yarns 13 shown in FIG. Structure to be entangled, or warp yarn 15 and weft yarn 1 shown in FIG.
It is possible to use a synthetic fiber woven fabric, such as a so-called Unicon weave, which is a structure in which 6 are arranged in a straight line and entwined with a entanglement yarn 17.

Among them, the Unicon weave is a preferable woven fabric for the conveyor belt of the present invention which receives a large tension in the longitudinal direction of the belt because the warp yarns are arranged in a straight line. As described above, conventional conveyor belts are susceptible to abnormal deformation and damage when foreign substances such as cakes or dropped objects stuck on the pulleys are caught between the pulleys and the conveyor belt. Even if the deformation is too small to reach a certain level, repeated use of the deformation leads to early fatigue and reduced strength, making it unbearable for long-term use.

In order to eliminate this weak point, it is necessary not to cause a large stress concentration in the synthetic fiber woven fabric constituting the reinforcing layer even when it is subjected to an abnormal deformation. This is done by increasing the elongation of the synthetic fiber fabric in the longitudinal direction of the belt. Therefore, in the present invention, the cutting elongation of the synthetic fiber woven fabric in the longitudinal direction of the belt is increased to 25% or more so that the synthetic fiber woven fabric is easily deformed under a large load and stress concentration is alleviated.

Further, in the conventional conveyor belt, permanent elongation often occurs as it is used, and the total length of the belt often becomes long. In order to eliminate this weak point, the longitudinal elongation of the synthetic fiber woven fabric due to the normal load during normal use is kept as small as possible. Normally, the normal load is set to about 10% of the cutting load. Therefore, in the present invention, the elongation in the longitudinal direction at 10% of the cutting load is set to 1.5% or less so that the belt longitudinal direction is reduced. Keeps the growth of.

Polyester fiber and nylon fiber are used in the synthetic fiber woven fabric of the conventional conveyor belt. The elongation of these woven fabrics at 10% load is the same as that of the present invention, but in general, it is more than that. Large, especially with nylon fibers. On the other hand, the cutting elongation of the synthetic fiber woven fabric of the conventional conveyor belt was considerably smaller than that of the present invention, and particularly the polyester fiber was smaller. Also,
Although it has been easy in the past to find another fiber having a large breaking elongation, in this case, the elongation at a load of 10% is also large.

However, not a fiber generally used in conventional belts, but a certain special fiber, for example, high elongation polyester and high elongation nylon adopted in the present invention, has an elongation at 10% load. Can be kept small, the cutting elongation can be kept large, and both can be worked well together.

[0020]

EXAMPLE A conveyor belt (example) and a conventional conveyor belt (comparative example) according to the present invention, in which the synthetic fiber woven fabrics constituting the reinforcing layer were made of the materials shown in Table 1, were manufactured, and the bending running test and the biting were performed. A running test was conducted. In the synthetic fiber woven fabric of Example 6, the warp yarns were arranged by alternately arranging general polyester yarns and general nylon yarns, and the synthetic fiber woven fabric of Example 7 was composed of general polyester fibers and general nylons. The yarn in which the fibers are mixed and twisted is the warp yarn, and the synthetic fiber woven fabrics of the other Examples and Comparative Examples are the warp yarn in which the fibers of the materials shown in Table 1 are twisted.

The woven structure of the synthetic fiber woven fabric is the so-called Unicon weave shown in FIG. 6 in all Examples and Comparative Examples. Next, the bending running test was carried out by a bending running tester shown in FIG. 2, and the belt test piece 4 was wound around a pair of running pulleys 5 and 5 and held by a bend pulley 6. Then, the elongation and the breaking elongation at a load of 10% of the belt cutting load were measured after rotating 5 million times.

The test conditions are as follows. Belt speed: 230 m / min Belt tension: 1/15 of belt breaking strength Diameter of running pulley: 500 mm Diameter of bend pulley: 315 mm In addition, the bite running test was conducted by the bite running tester shown in FIG. The belt test piece 7 is wound around a pair of traveling pulleys 8 and is held by a bend pulley 9. A protrusion 10 is provided on one of the traveling pulleys 8, 8. The projection 10 is assumed to be a foreign substance that has been bitten. Then, after rotating and running, the belt strength was measured, and the strength reduction rate before and after the test was determined.

The test conditions are as follows. Belt speed: 150 m / min Belt tension: 1/15 of belt breaking strength Diameter of running pulley: 600 mm Diameter of bend pulley: 600 mm Projection height: 45 mm Table 1 shows the materials and adhesion of the fibers used in Examples and Comparative Examples. The physical properties of the raw yarn before the liquid treatment, the treatment conditions of the adhesive liquid, and the physical properties of the yarn after the adhesive liquid treatment are shown. Table 2 shows the physical properties of the synthetic fiber fabric before the test in the belt direction, the physical properties after the bending running test, and the physical properties after the bite running test in Examples and Comparative Examples.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

As described above, according to the present invention, the synthetic fiber woven fabric has a cutting elongation of 25% or more in the longitudinal direction, and a cutting load of 1%.
Since the conveyor belt has an elongation at 0% load of 1.5% or less, it has the following excellent effects. . Since the elongation at a load of 10% of the cutting load is 1.5% or less, the elongation of the belt during use is small. Therefore, even if the belt is used for a long period of time, the total length of the belt is small, and therefore, it is not necessary to trim the belt length and adjust the machine length.
Further, the stroke of the take-up device can be shortened. . Despite the low elongation at a load of 10%, the elongation at break is as high as 25% or more. Since the belt is easily stretched against the abnormal deformation to occur and the stress concentration is small, the belt is hardly cut at an early stage due to direct cutting of the belt or fatigue due to repeated stress concentration. . As described above, the conveyor belt of the present invention can be easily maintained, and the number of personnel for maintenance and management can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a conveyor belt according to the present invention.

FIG. 2 is a schematic view of a conveyor belt bending running tester.

FIG. 3 is a schematic view of a conveyor belt biting traveling test machine.

FIG. 4 is a partial plan view of the synthetic fiber woven fabric according to the present invention.

FIG. 5 is a partial plan view of another synthetic fiber woven fabric according to the present invention.

FIG. 6 is a partial plan view of another synthetic fiber woven fabric according to the present invention.

[Explanation of symbols]

1 Reinforcing Layer 6,9 Bend Pulley 2 Top Cover 10 Protrusion 3 Bottom Cover 11, 13, 15 Warp 4,7 Belt Test Piece 12, 14, 16 Weft 5,8 Traveling Pulley 17 Entangled Thread

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Shimodahiro 2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd. Hiratsuka Plant (72) Inventor Teruo Suzuki 2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Incorporated company Hiratsuka Factory (72) Inventor Osamu Toda No. 2 Oiwake, Hiratsuka City, Kanagawa Prefecture Yokohama Rubber Co. Ltd. In Hiratsuka Factory (72) Inventor Ichiro Yamamoto No. 2 Oiwake, Hiratsuka City, Kanagawa Prefecture Yokohama Rubber Co., Ltd. Company Hiratsuka Factory (72) Inventor Shinichi Katsumata Hiratsuka City, Kanagawa Prefecture, No. 2 Oiwake Yokohama Rubber Co., Ltd. Hiratsuka Factory (72) Inventor Tsunejiro Mori Hiratsuka City, Kanagawa Prefecture No. 2 Oiwake Yokohama Rubber Co., Ltd. Hiratsuka Factory (72) Inventor Yoshimitsu Fukuchi 2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd. Hiratsuka Factory

Claims (8)

[Claims] 1. A conveyor belt in which a reinforcing layer made of a synthetic fiber woven fabric is embedded between an upper cover and a lower cover, wherein the synthetic fiber woven fabric has a longitudinal cutting elongation of 25% or more and 10% of a cutting load. A conveyor belt that has an elongation at load of 1.5% or less. 2. The conveyor belt according to claim 1, wherein the warp yarns of the synthetic fiber woven fabric are yarns made of high elongation polyester fiber. 3. The conveyor belt according to claim 1, wherein the warp yarns of the synthetic fiber woven fabric are yarns made of high elongation nylon fiber. 4. The synthetic fiber woven fabric has one to three warp yarns made of polyester fiber and nylon yarn.
The conveyor belt according to claim 1, wherein the woven fabric is alternately arranged for each book. 5. The conveyor belt according to claim 1, wherein the warp yarn of the synthetic fiber woven fabric is a mixed twist yarn of polyester fiber and nylon fiber. 6. The conveyor belt according to claim 1, wherein the warp yarns of the synthetic fiber woven fabric are treated with an adhesive liquid at a temperature of 200 ° C. or higher. 7. The conveyor belt according to claim 1, wherein the warp yarns of the synthetic fiber woven fabric are treated with an adhesive liquid at a set tension of 0.2 g / denier or less. . 8. The synthetic fiber woven fabric has a structure in which warp yarns and weft yarns are arranged in a straight line and woven by entwining with entanglement yarns.
Conveyor belt according to 2, 3, 4, 5, 6 or 7.