JP2023048847A - conveyor belt - Google Patents

Abstract

To provide a conveyor belt which can improve abrasion resistance with a simple structure.SOLUTION: A conveyor belt 1 includes two protrusion parts 2 arranged having an interval in a belt width direction and extending in a belt length direction, on a conveyance surface f1. Belt width direction outside ends 2e2 of the protrusion parts 2 are positioned at positions separated from belt width direction outside ends 1e of the conveyor belt 1 to the belt width direction inside by a distance S of 10 mm-100 mm respectively. A belt width direction width W2 of the protrusion part 2 is 50 mm-300 mm.SELECTED DRAWING: Figure 1

Description

The present invention relates to conveyor belts.

2. Description of the Related Art In some conveying devices using conveyor belts (belt conveyors), a member called a "skirt" hangs down toward the conveying surface of the conveyor belt in order to prevent scattering and falling of conveyed objects. For this reason, in order to reduce the acceleration of wear caused by the contact between the conveying surface and the skirt, a rubber compound having excellent wear resistance is added to the contact portion of the conveying surface with the skirt in the conventional conveyor belt. There is one that is arranged (see, for example, Patent Document 1).

JP-A-9-278139

However, even with the above-described conventional conveyor belt, there is room for improvement in improving wear resistance to the skirt when considering the degree of contact with the skirt. In addition, the above-described conventional conveyor belt has a complicated manufacturing process because it is necessary to dispose a different type of rubber as a part of the conveyor belt only in the part where wear is accelerated, and as a result, the manufacturing cost is increased. increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a conveyor belt that has a simple structure and can improve wear resistance.

The conveyor belt according to the present invention has two protrusions that are spaced apart in the belt width direction and extend in the belt length direction on the conveying surface of the conveyor belt, and the protrusions The belt width direction outer end of the portion is positioned at a distance of 10 mm to 100 mm in the belt width direction from the belt width direction outer end of the conveyor belt, and the belt width direction width of the convex portion is 50 mm. ~300 mm. ADVANTAGE OF THE INVENTION According to the conveyor belt which concerns on this invention, abrasion resistance can be improved with a simple structure.

In addition, the conveyor belt according to the present invention has two recesses arranged at intervals in the belt width direction and extending in the belt length direction on the back surface of the conveyor belt, and the recesses is arranged at a position corresponding to the convex portion when the conveyor belt is rolled in the belt length direction, and can be configured to be fitted into the convex portion. In this case, when the conveyor belt is rolled and wound in the belt length direction, the widthwise ends of the conveyor belt can be uniformly aligned.

ADVANTAGE OF THE INVENTION According to this invention, the conveyor belt which can improve abrasion resistance by a simple structure can be provided.

1 is a schematic plan view of a conveyor belt, in accordance with one embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view schematically showing the conveyor belt in the XX cross section, with the vicinity of the belt width direction center of the conveyor belt of FIG. 1 being omitted; FIG. 2 is a cross-sectional view schematically showing the conveyor belt in a YY cross section with the vicinity of the belt width direction center of the conveyor belt of FIG. 1 omitted. It is sectional drawing which shows roughly the state which rolled up the conveyor belt of FIG. 1 in the length direction, and overlapped the said conveyor belt in the XX cross section. Figure 2 is a schematic side view of an example of a transport apparatus that can use the conveyor belt of Figure 1; FIG. 6 is a cross-sectional view schematically showing the conveying device of FIG. 5 from the direction of movement of the conveyor belt;

Next, a conveyor belt 1 according to one embodiment of the present invention will be described with reference to the drawings.

We now define terms used in the following description. "Longitudinal direction of the belt" means the longitudinal direction of the conveyor belt. Further, when the conveyor belt is endless, the term "belt circumferential direction" includes the meaning of "belt length direction". Next, the "belt width direction" refers to the lateral direction of the conveyor belt. Here, the longitudinal direction of the belt and the transverse direction of the belt are perpendicular to each other. That is, the belt length direction and the belt width direction are perpendicular to each other. Furthermore, the "belt thickness direction" refers to a direction orthogonal to the belt length direction and the belt width direction. Moreover, when the conveyor belt is endless, the term "radial direction" includes the meaning of "the belt thickness direction". Additionally, "upper side" is inclusive of meaning the side of the surface of the conveyor belt. In addition, the "lower side" includes the case of meaning the back side of the belt conveyor.

FIG. 1 is a plan view showing the conveyor belt 1 from the conveying surface f1 side. As shown in FIG. 1, the conveyor belt 1 has a belt-like outer shape that is flattened in plan view. In this embodiment, the conveying surface f1 of the conveyor belt 1 is a flat surface. Two convex portions 2, which will be described later, are arranged on the conveying surface f1 of the conveyor belt 1. As shown in FIG. In this embodiment, the conveyor belt 1 is basically used in a flatly developed state as shown in FIG. It is used with the area near the center in the width direction sunk downward.

If FIG. 1 is referred, the conveyor belt 1 will have two protrusions 2 . The two protrusions 2 are arranged on the conveying surface f1 of the conveyor belt 1 at intervals in the belt width direction and extend in the belt length direction. A belt width direction outer end 2e2 of the convex portion 2 (hereinafter also referred to as a “convex portion width direction outer end 2e2”) is a distance S1 of 10 mm to 100 mm inward in the belt width direction from the belt width direction outer end 1e of the conveyor belt 1. (10 mm≦S1≦100 mm). Belt width W2 between belt width direction inner end 2e1 of convex portion 2 (hereinafter also referred to as “convex portion width direction inner end 2e1”) and belt width direction outer end 2e2 of convex portion 2, that is, convex The belt width direction width W2 of the portion 2 is 50 mm to 300 mm (50 mm≦W2≦300 mm).

Furthermore, it is preferable that the distance S1 falls within the range of 30 mm to 100 mm (30 mm≦S1≦100 mm). More preferably, the distance S1 is within the range of 60 mm to 90 mm (60 mm≦S1≦90 mm). Moreover, the width W2 in the belt width direction is preferably within the range of 50 mm to 250 mm (50 mm≦W2≦250 mm). More preferably, the width W2 in the belt width direction is within the range of 150 mm to 200 mm (150 mm≦W2≦200 mm).

FIG. 2 schematically shows the conveyor belt 1 in cross section along the line X-X, with the vicinity of the belt width direction center of the conveyor belt 1 omitted. The X-X cross section is a cross section that includes the belt width direction and the belt thickness direction and is perpendicular to the belt length direction when the conveyor belt 1 is flattened.

Referring to FIG. 2, in the present embodiment, the convex portion 2 includes two side walls (2b1, 2b2) spaced apart in the width direction, and an apex connecting to the upper ends of the two side walls (2b1, 2b2). wall 2a. The two side walls (2b1, 2b2) extend perpendicularly to the transport surface f1a in the thickness direction. That is, in the present embodiment, the width direction inner sidewall 2b1 of the protrusion 2 corresponds to the protrusion width direction inner end 2e1, and the width direction outer sidewall 2b2 of the protrusion 2 corresponds to the protrusion width direction outer end 2e2. . In the present embodiment, chamfering or rounding is preferably performed between the top wall 2a and the widthwise inner side wall 2b1. Similarly, in the present embodiment, chamfering or rounding is preferably performed between the top wall 2a and the widthwise outer side wall 2b2. In this embodiment, as shown in FIG. 2, R processing with a radius of r is performed.

FIG. 3 schematically shows the conveyor belt 1 in a Y-Y cross section with the vicinity of the belt width direction center of the conveyor belt 1 omitted. The YY cross section is a cross section that includes the belt width direction and the belt thickness direction and is perpendicular to the belt length direction when the conveyor belt 1 is flattened. In FIG. 3, the central portion of the belt width direction of the conveyor belt 1 is partially omitted, but this is a matter of drawing scale, and the conveyor belt 1 is actually continuous in the width direction. ing.

The internal structure of the conveyor belt 1 is not particularly limited, but referring to FIG. have.

The upper cover rubber 4 constitutes the upper portion of the conveyor belt 1 together with the two protrusions 2 . The upper cover rubber 4 is formed with a flat conveying surface f1. The two protrusions 2 protrude in the thickness direction from the transport surface f1. In this embodiment, the height h2 of the convex portion 2 is the height from the conveying surface f1 of the conveyor belt 1 in the thickness direction.

In this embodiment, the convex portion 2 is a rubber convex portion. In this embodiment, the convex portion 2 and the upper cover rubber 4 are integrated by vulcanization. However, according to the present invention, the convex portion 2 can be attached to the conveying surface f1 by using means such as adhesion, for example, without integrating with the upper cover rubber 4 until the boundary disappears. In this embodiment, the convex portion 2 and the upper cover rubber 4 are made of the same rubber material. However, according to the present invention, the protrusion 2 and the upper cover rubber 4 can also be made of different rubber materials.

The lower cover rubber 5 constitutes the lower portion of the conveyor belt 1 . The lower cover rubber 5 has a flat back surface f2. In this embodiment, the upper cover rubber 4 and the lower cover rubber 5 are integrated by vulcanization. However, according to the present invention, the upper cover rubber 4 and the lower cover rubber 5 can also be attached by using means such as gluing, for example. In this embodiment, the upper cover rubber 4 and the lower cover rubber 5 are made of the same rubber material. However, according to the invention, the upper cover rubber 4 and the lower cover rubber 5 can also be made of different rubber materials.

The core material 6 is embedded inside the lower cover rubber 5 . As the core material 6, for example, a belt-like canvas, a plurality of steel cords arranged in the width direction and extending in the length direction, or a fibrous material such as aramid fiber can be used. In this embodiment, the core material 6 is composed of a plurality of core materials 6 stacked in the vertical direction. Although three core members 6 (6a to 6c) are laminated in this embodiment, the layer structure of the core member 6 can be at least one layer.

Further, referring to FIG. 3, the conveyor belt 1 has two recesses 3 on its back surface f2. The two recesses 3 are spaced apart in the belt width direction and extend in the belt length direction. The concave portion 3 is arranged at a position corresponding to the convex portion 2 as shown in FIG. 4 when the conveyor belt 1 is rolled in the belt length direction, and is configured to be able to be fitted into the convex portion 2. .

Referring to FIG. 3, in the present embodiment, the widthwise outer end 3e2 of the recess 3 (hereinafter also referred to as "recessed widthwise outer end 3e2") extends from the belt widthwise outer end 1e of the conveyor belt 1 to the width of the belt. It is positioned at a position separated by a distance S5 of 10 mm to 100 mm inward in the direction (10 mm≦S5≦100 mm). A belt width direction width W3 between a belt width direction inner end 3e1 of the recess 3 (hereinafter also referred to as a “recess width direction inner end 3e1”) and a belt width direction outer end 3e2 of the recess 3, that is, the width of the recess 3 The belt width W3 is 50 mm to 300 mm (50 mm≦W3≦300 mm). As a specific example, it is preferable that S5<S1 and W3>W2.

Furthermore, the distance S5 is preferably within the range of 30 mm to 100 mm (30 mm≦S5≦100 mm). More preferably, the distance S5 is within the range of 60 mm to 90 mm (60 mm≦S5≦90 mm). Moreover, the width W3 in the belt width direction is preferably within the range of 50 mm to 250 mm (50 mm≦W3≦250 mm). More preferably, the belt width W3 is within the range of 150 mm to 200 mm (150 mm≦W3≦200 mm).

In this embodiment, the recess 3 has two side walls (3b1, 3b2) spaced apart in the width direction, and a bottom wall 3a connected to the upper ends of the two side walls (3b1, 3b2). . The two side walls (3b1, 3b2) extend perpendicularly to the conveying surface f1a in the belt thickness direction. That is, in the present embodiment, the belt width direction inner sidewall 3b1 of the recess 3 corresponds to the recess width direction inner end 3e1, and the belt width direction outer sidewall 3b2 of the recess 3 corresponds to the recess width direction outer end 3e2.

The relationship between the width W2 of the protrusion 2 in the belt width direction and the width W3 of the recess 3 in the belt width direction can be set as appropriate. In this embodiment, the fitting between the convex portion 2 and the concave portion 3 can be a clearance fit. In this case, the protrusion 2 can be easily inserted into the recess 3 . Further, in the present embodiment, the fitting between the convex portion 2 and the concave portion 3 can be a tight fit. In this case, the convex portion 2 can be firmly fixed inside the concave portion 3 . In addition, in the present embodiment, the fitting between the convex portion 2 and the concave portion 3 can be intermediate fitting.

The relationship between the height h2 of the convex portion 2 and the depth D3 of the concave portion 3 can also be set as appropriate. In this embodiment, the depth D3 of the concave portion 3 is the depth in the thickness direction from the rear surface f2. In this embodiment, the depth D3 of the concave portion 3 is preferably equal to or greater than the height h2 of the convex portion 2 (D3≧h2). In this case, when the conveyor belts 1 are rolled and overlapped, as shown in FIG. It is possible to match the back surface f2. Therefore, if the depth D3 of the concave portion 3 is made equal to or greater than the height h2 of the convex portion 2, the conveyor belt 1 can be rounded most compactly. However, according to the present invention, the depth D3 of the concave portion 3 can be made shallower than the height h2 of the convex portion 2 (D3<h2).

FIG. 5 shows an example of a belt conveyor (conveyor) 10 in which the conveyor belt 1 can be used.

A belt conveyor 10 has a conveyor belt 1 and a plurality of pulleys 11 . In this example, the pulley 11 consists of a front pulley 11a and a rear pulley 11b spaced apart from each other. In this example, the conveyor belt 1 is wound around a front pulley 11a and a rear pulley 11b. In this example, a receiving box 20 from which the article to be conveyed C is taken out is arranged on the lower front side of the front pulley 11a. In the conveyor belt 1, for example, the front pulley 11a can be driven to rotate by a driving device such as a motor, while the rear pulley 11b can be driven to rotate. The front pulley 11a can rotate forward or backward. Thereby, the conveyor belt 1 can be rotated in the circumferential direction (longitudinal direction) of the conveyor belt 1 . For example, when the conveyor belt 1 rotates in the direction of the arrow in FIG. 4, the portion of the conveyor belt 1 that moves from the rear pulley 11b toward the front pulley 11a corresponds to the carrier belt 1C and the front pulley 11a. The portion moving from the rear side pulley 11b corresponds to the return side belt 1R. In this example, the carrier-side belt 1C is movably supported in the circumferential direction by a plurality of rollers 12 and 13 that are spaced apart in the circumferential direction. Further, in this example, the return belt 1R is supported so as to be circumferentially movable by a plurality of rollers 14 arranged at intervals in the circumferential direction.

In FIG. 6 the belt conveyor 10 is shown schematically from its direction of movement. Referring to FIG. 6, the widthwise central portion of the conveyor belt 1 (carrier-side belt 1C) is supported by rollers 12 . The roller 12 is arranged so that its axis of rotation is parallel to the horizontal direction. Further, the widthwise outer end of the conveyor belt 1 is supported by rollers 13 . The roller 13 is arranged so that its axis of rotation is inclined with respect to the horizontal direction. Specifically, the rollers 13 are arranged so as to incline downward toward the inner side in the width direction. With such a configuration, the conveyor belt 1 moves in the circumferential direction while its widthwise end portion is inclined upward toward the widthwise outer side. As a result, the articles to be conveyed C are collected in the recess formed in the central portion of the conveying surface f1 of the conveyor belt 1 in the width direction.

Additionally, the belt conveyor 10 has a skirt portion 15 and a hopper (or chute) 19 .

Referring to FIG. 6, in this example, the skirt portion 15 has a skirt 16 for suppressing scattering and dropping of the conveyed article C, and an attachment frame 17 to which the skirt 16 is attached. In this example, a hopper 19 is attached to the attachment frame 17 . In this example, skirt 16 is attached to hopper 19 via bracket 18 .

The skirt 16 is a plate-shaped member extending along the circumferential direction (longitudinal direction) of the conveyor belt 1 inside the mounting frame 17 . The skirt 16 can be made of a soft material such as rubber or resin. In this example, a lower end portion 16a of the skirt 16 (hereinafter also referred to as a "skirt lower end portion 16a") is positioned at a position facing the widthwise end portion of the conveyor belt 1 in the vertical direction. Also, in this example, the skirt lower end portion 16 a is inclined so as to be parallel to the roller 13 . The convex portion 2 of the conveyor belt 1 is positioned directly below the skirt lower end portion 16a. The convex portion 2 can be brought into contact with the skirt lower end portion 16a. Alternatively, as shown in FIG. 6, the convex portion 2 may have a slight gap formed between the convex portion 2 and the skirt lower end portion 16a. As a result, even if the articles C are thrown onto the conveying surface f1 of the conveyor belt 1 through the hopper 19 and scatter around the conveyor belt 1, the scattering and falling of the articles C are suppressed by the skirt 16. be.

On the other hand, when the skirt 16 of the conveyor belt comes into contact with the conveying surface f1, wear of the conveying surface f1 is locally accelerated. Therefore, in the conventional conveyor belt, for example, a rubber compound having excellent wear resistance is locally provided on the portion of the conveying surface where wear is accelerated.

However, the carrying surface of a conventional conveyor belt is in direct contact with skirt 16 . Therefore, even if it is a conventional conveyor belt in which a part of the conveying surface is replaced with a rubber compound having excellent abrasion resistance, the degree of contact with the skirt (for example, contact time, contact frequency) is considered. In this case, there is room for improvement in improving the wear resistance of the skirt. In addition, such conventional conveyor belts must be manufactured with different rubbers only in those areas where wear is accelerated. For example, when vulcanizing a conveyor belt, it is necessary to accurately embed a rubber compound having excellent abrasion resistance in a region of the surface (conveying surface) of the upper cover rubber 4 that can come into contact with the skirt 16 . be. However, it is complicated and difficult to perform such operations within the mold. The complexity and difficulty of such work lead to an increase in manufacturing costs.

On the other hand, the conveyor belt 1 according to the present embodiment is provided with the convex portion 2 on the conveying surface f1 at the outer end in the width direction so that the convex portion 2 can come into contact with the skirt 16 before the conveying surface f1. Configured. According to the conveyor belt 1 according to this embodiment, when the skirt 16 contacts the conveyor belt 1, the convex portion 2 can be brought into contact with the conveying surface f1 first. In this manner, since the convex portion 2 comes into contact with the skirt 16 before the conveying surface f1, the wear on the conveying surface f1 is suppressed.

Specifically, as described above, the belt width direction outer end 2e2 of the convex portion 2 is positioned at a position separated from the belt width direction outer end 1e of the conveyor belt 1 toward the belt inner side by a distance S1 of 10 mm to 100 mm, The width W2 of the convex portion 2 in the belt width direction is set to 50 mm to 300 mm. According to S1 and W2 above, the convex portion 2 corresponds to the position of the skirt (more specifically, the lower end of the skirt) of a general belt conveyor, and can contact at least part or all of the skirt. (thus, abrasion of the conveying surface due to contact with the skirt can be suppressed).

According to the conveyor belt 1, it is possible to improve the abrasion resistance at the contact portion with the skirt 16 with a simple structure in which the convex portions 2 are provided at both ends of the conveying surface f1. Therefore, according to the conveyor belt 1, wear resistance can be improved with a simple configuration. Moreover, according to the conveyor belt 1, it can be manufactured by a simple method of only arranging the convex portions 2 on the conveying surface f1. Moreover, according to the conveyor belt 1, since it can be manufactured by a simple method of simply arranging the convex portions 2 on the conveying surface f1, an increase in manufacturing cost can be suppressed.

In addition, the belt width direction outer end 2e2 of the convex portion 2 is positioned at a position separated from the belt width direction outer end 1e of the conveyor belt 1 by a distance S1 of 30 mm to 100 mm to the belt inner side, and the belt width direction of the convex portion 2 is positioned. By setting the width W2 to 50 mm to 250 mm, the abrasion resistance of the contact portion with the skirt 16 can be further improved.

Further, the belt width direction outer end 2e2 of the convex portion 2 is positioned at a position separated from the belt width direction outer end 1e of the conveyor belt 1 by a distance S1 of 60 mm to 90 mm to the belt inner side, and the belt width direction of the convex portion 2 is positioned. By setting the width W2 to 150 mm to 200 mm, the abrasion resistance of the contact portion with the skirt 16 can be further improved.

In addition, the above-mentioned numerical range is derived as a result of examining a general belt conveyor (for example, product name "Steel Cord Conveyor Belt" manufactured by Bridgestone Co., Ltd.).

Further, in the conveyor belt 1, when the conveyor belt 1 is rolled in the belt length direction, the two recessed portions 3 formed on the back surface f2 of the conveyor belt 1 are formed in the same manner as the two convex portions 2, respectively, as shown in FIG. can be fitted in. In this case, when the conveyor belt 1 is rolled and wound in the belt length direction, as shown in FIG. 4, the belt width direction outer edge 1e of the conveyor belt 1 can be uniformly aligned.

Specifically, when the conveyor belt is rolled and wound in the belt length direction, the belt width direction outer edges 1e of the conveyor belts overlapped by winding may not be aligned in the width direction. For example, when the conveyor belt is wound before product shipment, the belt width direction outer ends 1e of the conveyor belts overlapped by winding may not be aligned in the width direction. In this way, when a portion of the belt width direction outer end 1e of the conveyor belt protrudes to the width direction outer side, the portion of the belt width direction outer end 1e may contact a frame or the like disposed therearound. There is This causes bending or breakage of the belt width direction end of the conveyor belt, or collapse of the winding of the conveyor belt.

On the other hand, when the conveyor belt 1 according to the present embodiment is rolled in the length direction, as shown in FIG. The recess 3 can be fitted. In this case, the belt width direction outer edge 1e of the conveyor belt 1 can be uniformly aligned without shifting in the width direction of the wound conveyor belt 1 . As a result, it is possible to suppress the occurrence of bending or breakage of the belt width direction outer edge of the conveyor belt 1 or collapse of the winding of the conveyor belt 1 that may occur due to the conveyor belt 1 shifting in the belt width direction during winding. can.

By the way, as a method of winding the conveyor belt, for example, there is a method of winding the conveyor belt on the winding drum by rotating the winding drum (axial winding method), and a method of sandwiching the conveyor belt between the winding drum and the rotating drum. There is a method of winding on a winding drum (under roll method).

In the case of the axial winding method, the conveyor belt can be wound while applying tension to the conveyor belt in the circumferential direction. In this case, it is possible to suppress a phenomenon in which the conveyor belt shifts in the width direction during winding. On the other hand, in the case of the under-roll method, the conveyor belt can be wound while applying tension to the conveyor belt in the circumferential direction. not enough to suppress the phenomenon.

On the other hand, in the conveyor belt 1 according to the present embodiment, as described above, the conveyor belt shifts in the width direction during winding without applying a large tension during winding by aligning the convex portions 2 and the concave portions 3. phenomenon can be suppressed. Therefore, it is more effective to use the conveyor belt 1 when it is assumed that the conveyor belt is wound by a method such as an under-roll method in which it is difficult to apply a large tension to the conveyor belt.

The above description merely describes one embodiment of the present invention, and various modifications are possible within the scope of the claims.

1: Conveyor belt 1e: Width direction outer end of conveyor belt f1: Conveying surface f2: Back surface of conveyor belt 1C: Carrier side belt 1R: Return side belt 2: Convex portion 2a: Top of convex portion Wall 2b1: Width direction inner side wall of convex portion 2b2: Width direction outer side wall of convex portion 2e1: Width direction inner end of convex portion 2e2: Width direction outer end of convex portion S1: Width direction outer side of conveyor belt Width direction distance from the end to the width direction outer end of the protrusion, h2: height of the protrusion, W2: width of the protrusion (between the width direction inner end of the protrusion and the width direction outer end of the protrusion) 3: recess 3a: bottom wall of recess 3b1: widthwise inner sidewall of recess 3b2: widthwise outer sidewall of recess 3e1: widthwise inner end of recess 3e2: widthwise outer end of recess , S5: Width direction distance from the width direction outer end of the conveyor belt to the width direction outer end of the recess, D3: Depth of the recess, W3: Width of the recess (the width direction inner end of the recess and the width direction outer side of the recess) width between ends), 4: upper cover rubber, 5: lower cover rubber, 6, 6a-6b: core material, 10: belt conveyor (conveyor), 11: pulley, 12: roller, 13: roller , 14: roller, 15: skirt portion, 16: skirt, 17: mounting frame, 18: bracket, 19: hopper (chute), 20: receiving box

Claims (2)

a conveyor belt,
The conveying surface of the conveyor belt has two projections that are spaced apart in the belt width direction and extend in the belt length direction, and the belt width direction outer ends of the projections are , positioned at a distance of 10 mm to 100 mm inward in the belt width direction from the outer edge in the belt width direction of the conveyor belt, and the width of the protrusion in the belt width direction is 50 mm to 300 mm. The back surface of the conveyor belt has two recesses spaced apart in the belt width direction and extending in the belt length direction, the recesses aligning the conveyor belt in the belt length direction. 2. The conveyor belt according to claim 1, which is arranged at a position corresponding to the projection when rolled into a straight shape and configured to be fittable into the projection.

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