JP2008195461A - Conveyor belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive conveyor belt easy to be deformed in a direction wherein both ends of the conveyor belt in the cross direction come close to each other and easy to be manufactured. <P>SOLUTION: This conveyor belt for a pipe conveyor is moved for circulation, repeating a deformation thereof from a flat shape into a cylindrical shape due to coming close of both ends in the cross direction to each other and a reverse deformation. This conveyor belt comprises a plurality of non-rubber layers 5 arranged to be layered along the belt surface of the conveyor belt 1 inside the conveyor belt 1 formed from a rubber 2 as a main material, and this conveyor belt is deformed in a direction wherein both the ends 11 and 11 of the conveyor belt 1 in the cross direction thereof come close to each other by forming the non-rubber layer (shrinkage canvas 9) of the non-rubber layers 5 into a layer having contractive performance larger than that of other non-rubber layers (core canvas 8). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a conveyor belt for a pipe conveyor that is easily deformed in a direction in which both end portions in the width direction of the conveyor belt approach each other.

An endless conveyor belt is stretched between a pair of pulleys at one end and a pulley at the other end, and in the conveying section, both ends in the width direction of the conveyor belt are brought close to each other by a guide roller for convergence and a shape retaining roller of a support frame. When the belt is deformed into a cylindrical state, the lateral rigidity in the vicinity of the edge in the width direction of the conveyor belt is increased in a conveyor belt of a belt conveyor device called a pipe conveyor that conveys a conveyed product in the cylinder. The number of stacks of core canvas at the edge in the width direction of the conveyor belt so that both ends in the width direction of the conveyor belt can be easily deformed in the direction approaching each other by lowering the lateral rigidity at the center of the conveyor belt. There are known conveyor belts having a configuration in which the number of core canvases stacked in the center of the conveyor belt is less than the number of layers (for example, , See Patent Document 1).
JP 9-315533 A

However, in the above prior art, since it is necessary to use two types of core canvases having different widths, the manufacturing cost of the conveyor belt is increased, and the core canvas having a short width with respect to the core canvas having a large width is manufactured. There was a problem that positioning was difficult.
In view of the above-described conventional problems, the present invention provides a conveyor belt that is easily deformed in a direction in which both end portions in the width direction of the conveyor belt approach each other and that is easy to manufacture.

The conveyor belt of the present invention is formed mainly of rubber in a conveyor belt for a pipe conveyor that circulates while repeating deformation from a flat shape to a cylindrical shape due to the fact that both ends in the width direction approach each other and vice versa. A plurality of non-rubber layers arranged in a laminated state along the belt surface of the conveyor belt are provided on the inner side of the conveyor belt, and one of the non-rubber layers is more shrinkable than the other non-rubber layers. It is characterized in that both ends of the conveyor belt in the width direction are deformed so as to approach each other.
Inside the conveyor belt, a plurality of non-rubber layers having the same width corresponding to the width of the conveyor belt are arranged in parallel to each other, and one non-rubber layer has a coefficient of thermal expansion and contraction higher than other non-rubber layers. And the non-rubber layer is heated and cooled so that both end portions in the width direction of the conveyor belt are deformed so as to approach each other.
One non-rubber layer is also characterized by being formed of a material having a higher coefficient of thermal expansion and contraction than other non-rubber layers.

According to the conveyor belt of the present invention, there is provided a conveyor belt that is easy to manufacture and inexpensive because both end portions in the width direction of the belt are easily deformed in a direction approaching each other and a plurality of non-rubber layers having the same width can be used. can get.
Since the non-rubber layer is heated and cooled, a conveyor belt in which both end portions in the width direction of the conveyor belt approach each other in the initial state is obtained.
Since some non-rubber layers are made of a material having a higher coefficient of thermal expansion and contraction than other non-rubber layers, some non-rubber layers and other non-rubber layers can be manufactured in the same manufacturing process, so the manufacture of conveyor belts The number of processes can be reduced.

Best form 1
FIG. 1A shows a state before the non-rubber layer is shrunk, and FIG. 1B shows a state after the non-rubber layer is shrunk. As shown in FIG. 1 (a), the conveyor belt 1 is laminated along the belt surface (the belt surface 3 and the belt back surface 4) of the conveyor belt 1 inside the conveyor belt 1 formed with rubber 2 as a main material. A plurality of non-rubber layers 5 arranged in a state are provided. That is, the conveyor belt 1 includes a front rubber 6 that forms the belt surface 3 of the conveyor belt 1, a back rubber 7 that forms the belt back surface 4 of the conveyor belt 1, and other non-covers provided between the front rubber and the back rubber. A plurality of core canvas 8 as the rubber layer 5 and a contracted canvas 9 as a non-rubber layer 5, a conveyor belt between the front rubber 6 and the back rubber 7 at both ends 11; 11 in the width direction of the conveyor belt 1. 1 is formed by side rubbers 10; 10 that form both end portions in the width direction.

  In general, the front rubber 6, the back rubber 7, the core canvas 8, the shrink canvas 9, and the side rubber 10 are separately formed in advance in the form of long rolls, and these parts are fed from the long rolls. The conveyor belt 1 is manufactured by laminating with a molding machine (not shown) and vulcanizing with a vulcanizer (not shown). The contracted canvas 9 is disposed on the side close to the belt surface 3 of the conveyor belt 1, and the core canvas 8 is disposed on the side close to the belt back surface 4 of the conveyor belt 1. The core canvas 8 and the contracted canvas 9 may be sent to the molding machine after being previously coated with rubber and formed in a long roll shape.

  The core canvas 8 and the contracted canvas 9 are formed of different materials. The core canvas 8 and the contracted canvas 9 are formed of warp yarns and weft yarns not shown in the figure and a binder that connects them. The warp yarn is a yarn extending in the longitudinal direction of the conveyor belt 1, and the weft yarn is a yarn extending in the short direction (width direction) of the conveyor belt 1. As the material for forming the shrinkable canvas 9, a material having a larger thermal expansion coefficient and shrinkage rate than the material for forming the core canvas 8 is used. For example, 6-nylon is used as a material for forming the contracted canvas 9, and polyester is used as a material for forming the core canvas 8. Alternatively, high-shrinkage polyester is used as a material for forming the shrinkable canvas 9, and Kevlar is used as a material for forming the core canvas 8. That is, the contracted canvas 9 and the core canvas 8 are each formed of a synthetic resin material, but the contracted canvas 9 is formed of a synthetic resin material having a higher thermal expansion coefficient and contraction rate than the core canvas 8.

  Before the vulcanization of the conveyor belt 1, the contracted canvas 9 and the core canvas 8 having the same width a corresponding to the width of the conveyor belt 1 are arranged inside the conveyor belt 1 in parallel with each other. 9 and the core canvas 8 are embedded in the rubber 2 such that the width edges of the core canvas 8 are vertically aligned (see FIG. 1A).

At the time of vulcanization of the conveyor belt 1, the belt surface 3 and the belt back surface 4 of the conveyor belt 1 are formed into a flat shape with the core canvas 8 and the contracted canvas 9 expanded by heat. At this time, since the contracted canvas 9 has a larger coefficient of thermal expansion than the core canvas 8, the belt surface 3 and the belt back surface 4 of the conveyor belt 1 are formed in a flat shape in a state where the contracted canvas 9 is expanded from the core canvas 8. The Then, after the vulcanization, when the temperature of the conveyor belt 1 decreases to about room temperature, the core canvas 8 and the contracted canvas 9 contract. At this time, since the contracted canvas 9 has a thermal expansion coefficient and a contraction rate larger than those of the core canvas 8, the contracted canvas 9 is contracted so that the rubber 2 around the contracted canvas 9 is pulled by the contracted canvas 9, and the conveyor belt 1. The both ends 11; 11 in the width direction of the conveyor belt 1 are deformed in the width direction so as to approach each other (see FIG. 1A).
For this reason, this conveyor belt 1 is used as a conveyor belt for a pipe conveyor that circulates while repeating the deformation from the flat shape to the cylindrical shape due to the fact that both end portions 11; 11 in the width direction approach each other and vice versa. In this case, deformation into a cylindrical shape is facilitated.

According to the best mode 1, it is possible to use the contracted canvas 9 and the core canvas 8 having the same width and length a that are easily deformed in the direction in which both ends 11; 11 in the width direction of the conveyor belt 1 approach each other. Therefore, by using the contracted canvas 9 and the core canvas 8 having the same width, the conveyor belt 1 that is easy to manufacture and inexpensive can be obtained.
In addition, the contracted canvas 9 and the core canvas 8 as the non-rubber layer 5 are heated and cooled, so that the both ends 11; 11 in the width direction of the conveyor belt 1 are deformed in a direction approaching each other in the initial state. A belt 1 is obtained.
Since the contracted canvas 9 and the core canvas 8 have the same width length a, and the contracted canvas 9 is formed of a material having a higher thermal expansion coefficient and contraction rate than the core canvas 8, the contracted canvas 9 and the core canvas 8 Can be manufactured in the same manufacturing process, the manufacturing process of the conveyor belt 1 can be reduced.
In addition, the repulsive force of the conveyor belt 1 applied to the converging guide roller and the shape retaining roller of the support frame (not shown) can be reduced, and the retractability of the conveyor belt 1 to the shape retaining roller is improved.

Best form 2
A core canvas 8 and a shrink canvas 9 having different knitting methods are used. For example, the core canvas 8 and the contracted canvas 9 are formed of the same material, and the number of warp threads of the contracted canvas 9 is less than the number of warp threads of the core canvas 8. In this case, the length of the weft per unit width is shorter than the core canvas 8 in the contracted canvas 9 in which the number of warp yarns is reduced. Is shorter than the width of the core canvas 8. As in the best mode 1, as the material for forming the contracted canvas 9, a material having a higher thermal expansion coefficient and contraction rate than the material forming the core canvas 8 may be used.

The non-rubber layer 5 may be formed by coating a plurality of cords with rubber so that the plurality of cords are embedded in the rubber so as to be arranged side by side and formed into a long shape. In this case, for example, 6-nylon is used as a material for forming a shrink cord of a shrink rubber layer as a non-rubber layer, and polyester is used as a material for forming a core cord of a core rubber layer as another non-rubber layer. Use it.
A non-rubber layer on the side close to the belt surface 3 of the conveyor belt 1 may be disposed, and the core canvas 8 may have another non-rubber layer disposed on the side close to the belt back surface 4 of the conveyor belt 1.
Two or more non-rubber layers may be provided. There may be one other non-rubber layer. That is, it is only necessary to provide one or more non-rubber layers and one or more other non-rubber layers.

Sectional drawing of a conveyor belt is shown, (a) is sectional drawing which shows the state before shrinkage | contraction of a non-rubber layer, (b) is sectional drawing which shows the state after shrinkage | contraction of a non-rubber layer (best form 1-2).

Explanation of symbols

1 conveyor belt, 2 rubber, 3 belt surface (belt surface),
4 Belt back (belt surface), 5 non-rubber layer, 8 core canvas (other non-rubber layers),
9 Shrink canvas (some non-rubber layer), 11; 11 Ends of conveyor belt.

Claims (3)

In a conveyor belt for a pipe conveyor that circulates while repeating a deformation from a flat shape to a cylindrical shape due to the fact that both ends in the width direction approach each other and vice versa,
A plurality of non-rubber layers arranged in a laminated state along the belt surface of the conveyor belt are provided inside a conveyor belt formed of rubber as a main material. A conveyor belt, wherein both ends of the conveyor belt in the width direction are deformed in a direction approaching each other by being formed in a layer having a higher contractibility than the rubber layer.   Inside the conveyor belt, a plurality of non-rubber layers having the same width corresponding to the width of the conveyor belt are arranged in parallel to each other, and one non-rubber layer has a coefficient of thermal expansion and contraction higher than other non-rubber layers. 2. The conveyor belt according to claim 1, wherein both end portions in the width direction of the conveyor belt are deformed so as to approach each other because the non-rubber layer is heated and cooled. .   The conveyor belt according to claim 1 or 2, wherein a certain non-rubber layer is formed of a material having a higher coefficient of thermal expansion and contraction than other non-rubber layers.

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