JPS638008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to improvements to cylindrical conveyor belts.

The cylindrical conveyor belt is composed of a central conveyor section and a pair of ears integrally formed at both ends of the conveyor section, and has an endless shape with its leading and trailing ends joined together. During use, this cylindrical conveyor belt is guided and deformed by guide rollers, etc., so that the conveyor section has a circular cross section, and a pair of ears formed at both ends of the belt are in contact with each other. The object is then transported by a cylindrical conveyor section.

[Prior art]

Conventional cylindrical conveyor belts have a pair of ears that are thicker than the conveyor part, or have ears that are inclined at a certain angle with respect to the conveyor part. For this reason, conventional cylindrical conveyor belts required special molds to vulcanize the ears. Also, when packing and transporting manufactured cylindrical conveyor belts, the conveyor part and the ear parts have different thicknesses and shapes, which makes them bulky.
It was difficult. Furthermore, when the belt is bent by a pulley when the conveyor belt is driven, a large strain is applied to the ear portion having a thick wall or an inclined portion, resulting in abnormal deformation of the ear portion.

Furthermore, when the conveyor belt runs around a curve, the sides on both sides come close to each other, and as shown in FIG. 10, for example, there is a problem in that the sloped part 101 and the bottom part 102 rise up and the cross-sectional area becomes extremely small.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a conveyor belt which does not have the above-described problems and has a cylindrical shape formed in a conveyor section that is close to a perfect circle.

[Structure of the invention]

The cylindrical conveyor belt of the present invention has an endless shape, and is composed of a central conveyor section in cross section and a pair of ears integrally formed at both ends of the conveyor section. The parts are brought into contact with each other by a pair of holding rollers, the end surfaces of the joined parts are regulated by end rollers, and the conveyor part is formed into a cylindrical shape by a pair of guide rollers and is pushed upward. A cylindrical conveyor belt that presses the ears at both ends of the conveyor section against the end roller, and the conveyor section has a bottom section located at the centermost point in the cross section and forming a cylindrical bottom; a pair of side parts located on both sides and forming a cylindrical side wall; a pair of inclined parts located on each outer side of the pair of side parts and forming an oblique upper part of the cylindrical shape; a neck part located between the inclined part and the ear part and forming a cylindrical opening; the stiffness of the neck part in the transverse direction is determined by It is characterized by being smaller than the rigidity.

[Detailed Description of the Structure of the Invention] The cylindrical conveyor belt of the present invention is endless and relatively thick sheet-like with a substantially constant thickness in the cross section. This cylindrical conveyor belt has a bottom part located at the centermost part in the cross section and which forms the bottom when bent into a cylindrical shape, and two parts which are located on both sides of the bottom part and form side walls when bent into a cylindrical shape. a pair of side parts, a pair of sloped parts located on the outside of the pair of side parts and forming the diagonally upper part of the cylindrical shape; It is composed of a neck part forming an opening and an ear part located at the outermost side.

The cross section of this cylindrical conveyor belt has approximately the same wall thickness. For this reason, except in special cases, the bottom, side, slope, neck, and ears are not clearly separated in appearance.

The cylindrical conveyor belt of the present invention maintains a nearly perfect cylindrical shape when bent into a cylindrical shape by changing the rigidity of each of the above-mentioned parts in the transverse direction.

The ear part is a part that is bent into a cylindrical shape and has both ends brought into contact with each other so as to close the open end of the cylindrical shape. That is, in the state of use, the ears are strongly pressed from their outer surfaces by a pinching roller or the like, so that the ears are shaped like palms together.
Further, each end face of the ear portion is pressed by an end face roller.

The width of the ears is determined by the overall size of the conveyor belt, the object to be conveyed, etc. In general, if the length of the cylindrical conveyor section in the construction direction is 100, the width of each ear section is 2.
~10 is appropriate.

The inner surfaces of the ears are in contact with each other, and the outer surfaces are in contact with the nipping roller. For this reason, it is preferable that the inner and outer surfaces of the ears be made of a material that has higher abrasion resistance than other parts of the conveyor belt.
Further, it is preferable that the ears have high rigidity in the transverse direction. In other words, it is preferable to prevent warping or the like from occurring in the transverse direction at the ears as much as possible.

The neck is located inside each ear. This neck corresponds to the opening of the conveyor section which is bent into a cylindrical shape. This neck is subjected to the greatest bending in the transverse direction. Also, the bending direction is different from other conveyor parts, and the inner surface is convex. The optimum value for the width of the neck can also be determined depending on the intended use of the conveyor belt.
Generally, when the length in the transverse direction of the cylindrical conveyor section is 100, it is appropriate that the width (lateral length) of each neck is about 0.5 to 10. still,
The stiffness of the neck will be explained later regarding the entire conveyor section.

The inclined portion constitutes an arc-shaped portion extending obliquely upward when bent into a cylindrical shape, and is present between the neck portion and the side portion. The appropriate width of each inclined portion is about 10 to 15, assuming that the lateral length of the conveyor portion is 100.

When the side part is bent into a cylindrical shape, it becomes a side wall part.The length of each side wall part in the transverse direction is 20~20 when the entire conveyor belt part is taken as 100.
Approximately 30 is appropriate.

The bottom is the part that corresponds to the bottom when bent into a cylindrical shape, and the appropriate length of this bottom in the transverse direction is about 20 to 30 mm when the conveyor belt section is 100 mm.

In the present invention, the stiffness of the neck in the transverse direction described above is smaller than the stiffness of any part including the ears and other conveyor parts. In other words, it is made of soft material.

As one indicator of the rigidity of a conveyor belt, there is a trough performance test method based on the standards of the Japan Rubber Association. Here, trough performance was measured using the following method according to this standard. In other words, the belt width in the vertical direction is 150 mm and the belt width in the horizontal direction (this is Lmm) is 900 mm, and the four corners of a rectangular test piece are hung with hanging tools, and the average value of the deflection at the center of the test piece (Fmm) is calculated. It was measured. The trough performance T of this test piece is determined by T=F/L. Trough performance T
has a large value when the stiffness is small, that is, it is soft. The transverse stiffness of the conveyor belt of the present invention is expressed by this trough performance T. The rigidity (trough performance) of each part will be explained based on the trough performance of the bottom, which is the centermost part of the cylindrical conveyor belt.

When the trough performance at the bottom in the transverse direction is set to 100, the trough performance at the neck is preferably 150 to 400.
Note that the thickness of the neck portion may be thinner than the thickness of other conveyor belts to improve trough performance. In this case, it is preferable to form a groove extending in the longitudinal direction on at least one side of the neck.

The stiffness of the inclined portion in the transverse direction is a trough performance, and is preferably 50 to 110 when the trough performance of the bottom is 100.

The side trough performance is preferably 120-200.

In the cylindrical conveyor belt of the present invention, the neck is the part that makes the greatest contribution to achieving a nearly perfectly circular conveyor section. This is because the thickness of the conveyor belt in the lateral direction is kept within a certain range and the cross-sectional shape is flat, so that a large bending strain inevitably acts on the neck. The purpose of making the neck soft is to facilitate this bending deformation.

Note that it is also possible to reduce the stiffness of only the neck and make the other parts have substantially the same stiffness that is higher than the stiffness of the neck. A conveyor belt like this, which has a flat cross-section with only the neck softened, has relatively low roundness when deformed into a cylindrical shape, but it can be used for conveyor belts with little bending, such as cylindrical conveyor belts that run in a straight line. can.

Furthermore, in order to obtain a cylindrical conveyor belt with a high degree of roundness, it is necessary to make the rigidity of the side portions the second smallest after that of the neck portion. Furthermore, when the cylindrical shape is made to be close to a perfect circle, the rigidity of the inclined part is made higher than that of the bottom part. This is because, as shown in FIG. 10, when a conventional conveyor belt runs around a corner, the sides tend to rise. By making the sloped part and the bottom part harder than the side parts, the sloped part and the sides can be maintained in a horizontally extending manner, and can be bent at the sides.

To change the stiffness of a cylindrical conveyor belt in the transverse direction, increase or decrease the number of reinforcing layers buried in the transverse direction, or use a combination of reinforcing layers with high stiffness and reinforcing layers with low stiffness, etc. The transverse stiffness can be varied. In order to maintain the overall integrity of the cylindrical conveyor belt in the transverse direction, it is preferable that the reinforcing layer disposed at least in the center has at least one reinforcing layer communicating with the neck in the transverse direction. .

The longitudinal stiffness of the entire cylindrical conveyor belt is preferably as homogeneous as possible.
Further, it is more preferable that the ears, neck, slope, sides, and bottom have the same stiffness in the longitudinal direction, but the stiffness in the longitudinal direction of each of these parts may be different. For example, the stiffness of each of these parts in the longitudinal direction may be the same as the stiffness of each part in the transverse direction.

Furthermore, as for the reinforcing layer, rubber, and other materials constituting the cylindrical conveyor belt of the present invention, the reinforcing layer, rubber, and other materials used in conventional conveyor belts and cylindrical conveyor belts can be used as they are. .

As shown in FIG. 8, the rollers for deforming the cylindrical conveyor belt of the present invention into a cylindrical shape include five cylindrical guide rollers that come into contact with the outer surface of each slope, each side, and the bottom; It is preferable to have a pair of clamping rollers that clamp from the outer surface of the ear and an end face roller that defines the end face of the ear. Furthermore, it is more preferable to use a configuration in which one additional guide roller is provided between the bottom and side parts. In the cylindrical conveyor belt of the present invention, a pair of ears are brought into contact with each other by a pair of pinching rollers, the end faces of the joined ears are regulated by end rollers, and the conveyor part is shaped into a cylindrical shape by a pair of guide rollers. The conveyor section is formed in a shape that is pushed upward, and presses the ears at both ends of the conveyor section against the end rollers.

〔Effect of the invention〕

The cylindrical conveyor belt of the present invention is in the form of a sheet with a substantially constant wall thickness in cross section in the transverse direction. This thickness in the transverse direction has no partially thick parts, which simplifies the molds used for manufacturing such as vulcanization, and makes it extremely easy to pack and transport the cylindrical conveyor belt. . In addition, when used as a cylindrical conveyor belt, compressive force tends to act on the neck, so there is no need to consider damage caused by tensile stress at the neck.
It is durable because no abnormal strain is applied to the ears and neck. Furthermore, since the transverse direction stiffness of the cylindrical conveyor belt is set to a certain degree depending on each part, the cylindrical shape formed by the cylindrical conveyor belt is close to a perfect circle, and the conveyance of objects on the cylindrical conveyor belt is improved. becomes easier.
Furthermore, even when the cylindrical conveyor belt bends and travels, the cross section remains relatively circular.

Embodiment 1 FIG. 1 shows a cross section of a main part of a cylindrical conveyor belt according to a first embodiment of the present invention. This cylindrical conveyor belt has a total width of 136 cm, a thickness of 20 mm, and a length of approximately 50 m.
The total width of 136cm consists of a center part 1 with a width of about 110cm, a neck part 3 with a width of about 5cm connected on both sides, and ears 2 with a width of about 6cm at both ends. The cylindrical conveyor part has a central part 1 and neck parts 3 provided on both sides of the central part 1.
It consists of The thickness of the conveyor belt is approximately 20 mm in all parts. A two-layer central reinforcing layer 4 made of canvas is embedded in this cylindrical conveyor belt so as to communicate with the central portion 1, the neck portion 3, and the ear portion 2. Further, in the central portion 1, two side reinforcing layers 5 each made of the same canvas are buried on both sides of the central reinforcing layer 4. Furthermore, two side reinforcing layers 6 made of canvas are formed on each side of the central reinforcing layer 4 in the ear portion 2 as well. Both of the side reinforcing layers 5 and 6 have a width shorter on the side closer to the surface of the belt than on the side closer to the center. The part made entirely of rubber becomes wider the closer it is to the surface.

The canvas constituting each of the reinforcing layers 4, 5, and 6 used had a half-mat structure using polyester fiber as the warp and nylon 6 as the weft. The long axis direction (warp direction) of this canvas
The strength is 430Kg/3cm or more, and the strength in the width direction (latitude thread) is 295Kg/3cm or more. The rubber used was a blend of natural rubber and styrene-butadiene rubber, and the hardness of the rubber was approximately 65 in Hs.

This cylindrical conveyor belt was produced using the same belt press that produces conventional flat conveyor belts. That is, the unvulcanized surface cover rubber on the lower mold surface of the belt press, and the center and side reinforcing layers 4, 5, and 6 made of canvas, etc., were laminated in the same manner as in the prior art. The cylindrical conveyor belt of this example having a length of approximately 50 mm was manufactured by heating and pressurizing the belt in a belt press to vulcanize and mold a belt portion of a certain length, and by sequentially moving the molded portions. The obtained trough performance of the center part 1 and ear part 2 is 0.141,
The trough performance of neck 3 was approximately 0.280.

This cylindrical conveyor belt was mounted on a conventional cylindrical conveyor device. FIG. 2 shows the state in which it is deformed into a cylindrical shape by this attachment. In the cylindrical conveyor belt of the first embodiment, a conveyor section consisting of a center section 1 and a neck section 3 is deformed into a substantially circular shape by seven cylindrical guide rollers 7, and an ear section 2 is formed by a pair of pinching rollers 8. The position of the end surface of the ear part 2 is regulated by an end face roller 9 that is brought into contact with the palms of the hands and regulates the end face of the ear part 2.

The cylindrical conveyor belt of the first embodiment has a second
As shown in the figure, the neck part 3 where there is no side reinforcement layer
The deformation stress between the center portion 1 and the ear portion 2 is absorbed, and there is no problem such as the ear portion 2 lifting up. It was also confirmed that there is a tendency for compressive force to act on the neck portion 3, and that there is no need to consider damage, etc. due to tensile stress in the neck portion 3.

Embodiment 2 FIG. 3 shows a cross section of a main part of a cylindrical conveyor belt according to a second embodiment of the present invention.

The cylindrical conveyor belt of the second embodiment has ears that are smaller than the cylindrical conveyor belt of the first embodiment.
This is a modified version of the configuration. That is, the side reinforcement layer is not used for the ear portion 11, and instead, the surface layer 10 is made of butadiene rubber and natural rubber in a ratio of 6 to 4.
A layer containing a wear-resistant member made of a rubber compounded composition blended at a ratio of . The structure of the central part 1 and neck part 3 that constitute the conveyor part is Example 1
It is exactly the same as the cylindrical conveyor belt. The trough performance of the central portion 1 and neck portion 3 of the second embodiment is 0.141 and 0.280, which are the same as those of the first embodiment, and the trough performance of the ear portion 11 is 0.210.

In this cylindrical conveyor belt, the ears 11
Since the surface thereof is formed of the surface layer 10 containing a wear-resistant material, wear on the ear portion 11 is reduced and durability is improved.

Embodiment 3 A cross section of a main part of a cylindrical conveyor belt according to a third embodiment of the present invention is shown in FIG. The cylindrical conveyor belt of the third embodiment has a neck portion 12 that is different from the cylindrical conveyor belt of the first embodiment. That is, a groove 13 having a semicircular cross section extending in the longitudinal direction is provided on the outer surface of the neck portion 12. As shown in FIG. 5, the groove 13 deforms into a cylindrical shape.
The neck portion 12 can be easily bent. Here, each roller used is the same as in Example 1, and is given the same reference numeral. Incidentally, as shown in FIG. 6, which shows a cross section of the main part, grooves 15 and 16 extending in the longitudinal direction may be provided on both sides of the outer and inner surfaces of the neck part 14.

Embodiment 4 A cross section of a cylindrical conveyor belt according to a fourth embodiment of the present invention is shown in FIG. This cylindrical conveyor belt has a length of 30m, a total width of 110cm, and a total thickness of 14mm.
It is.

The structure in the width direction includes, from the center, a bottom part 17, side parts 18 forming both sides of the bottom part 17, an inclined part 19, a neck part 20, and an ear part 21. The length in the width direction of the bottom part 17 is 275 mm, the length in the width direction of each of the two side parts 18 is 165 mm, the length in the width direction of each of the two inclined parts 19 is 147.5 mm, and the length in the width direction of each of the two neck parts 20 The length in the width direction is
The length in the width direction of each of the two ears 21 is 70 mm.

Two types of reinforcing layers were used: a tensile cloth shown by thick solid lines and a high elongation cloth shown by dotted lines. The tensile fabric has a warp of polyester and a weft of nylon, approximately 40kg/cm.
The elongation under load is approximately 1.5 to 2%. or,
In high elongation fabric, the warp is made of high elongation nylon, the weft is usually made of nylon, and the elongation is about 20 when under a load of about 10 kg/cm.
%belongs to.

In the cross section of FIG. 7, the upper surface is the surface on which the object is conveyed. The lower surface becomes the outer surface when transformed into a cylindrical conveyor belt. In the bottom part 17 of the conveyor belt, a tensile cloth 22 with a width of 220 mm is buried in the center in the thickness direction, a tensile cloth 23 with a width of 330 mm is buried above it, and a high elongation cloth 24 with a width of 900 mm is buried in the lower part. ing. The side portion 18 has a width at the center in the thickness direction located on both sides of the tensile material cloth 22 of the bottom portion 17.
A high elongation cloth 25 with a width of 220 mm is buried therein, a high elongation cloth 26 with a width of 110 mm is buried above the high elongation cloth 25, and a high elongation cloth 24 described in connection with the bottom part 17 is buried below the high elongation cloth 25. The inclined part 19 has a tensile cloth 27 having a width of 220 mm at the center in the thickness direction, a tensile cloth 28 having a width of 275 mm above it, a tensile cloth 29 having a width of 150 mm above it, and a tensile cloth 29 having a width of 150 mm below it. A high elongation cloth 24 is buried therein. In the neck portion 20, only the tensile cloth 27 and the tensile cloth 28 above the tensile cloth 27 are embedded in the center portion described above. In the ear portion 21, the tensile cloths 27 and 28 described above, a tensile cloth 30 above them, and a tensile cloth 31 below them are embedded. In addition, the bottom part 17 of this conveyor belt,
The thickness of the cover rubber on the upper surface side of the side portion 18 is 3 mm, and the thickness of the cover rubber on the upper surface side of the inclined portion 19 and the ear portion 21 is 4 mm. The thickness of the lower cover rubber is 4 mm except for the neck 20. In addition, the hardness of the cover rubber was approximately 56 in Hs.

The trough performance of this conveyor belt is
7, the side portion 18, slope portion 19, neck portion 20 and ear portion 21 were 0.220, 0.270, 0.160, 0.282 and 0.282, respectively.

This cylindrical conveyor belt was also manufactured in the same manner as the cylindrical conveyor belt of Example 1.

This cylindrical conveyor belt was mounted on a conveyor device. FIG. 8 shows a state in which it is deformed into a cylindrical shape by this device.

In the cylindrical conveyor belt of this embodiment, the conveyor portion is deformed into a substantially circular shape by five cylindrical guide rollers 7, and the ears 21 are brought into contact with each other by a pair of pinching rollers 8. The position of the end surface of the ear portion 21 is regulated by an end surface roller 9 that regulates the end surface.

The cylindrical conveyor belt of this example was deformed into a substantially perfect circular shape by five cylindrical guide rollers. Furthermore, this conveyor belt was able to maintain a relatively close to perfect circular shape even in the curved portion of the conveyor device.

Embodiment 5 A cross section of a cylindrical conveyor belt according to a fifth embodiment of the present invention is shown in FIG. This cylindrical conveyor belt has a length of 50 m, a total width of 138 cm, and a total thickness of approximately 15 cm.
mm.

The structure in the width direction includes, from the center, a bottom part 32, side parts 33 forming both sides of the bottom part 32, an inclined part 34, a neck part 35, and an ear part 36. The length in the width direction of the bottom part 32 is 350 mm, the length in the width direction of each of the two side parts 33 is 250 mm, the length in the width direction of each of the two inclined parts 34 is 175 mm, and the length of each of the two neck parts 35 in the width direction is 250 mm. The length in the width direction is 30
mm, and the length in the width direction of each of the two ears 36 is 60 mm.

Two types of reinforcing layers were used: a tensile cloth shown by thick solid lines and a high elongation cloth shown by dotted lines. These tensile fabrics and high elongation fabrics are the same as those of Example 4.

In the cross section of FIG. 9, the upper surface is the surface on which the object is conveyed. The lower surface becomes the outer surface when transformed into a cylindrical conveyor belt. At the bottom 32 of the conveyor belt, a tensile cloth 37 with a width of 450 mm is provided from the upper surface in the thickness direction, a tensile cloth 38 with a width of 350 mm is placed below the tensile cloth 37, and a tensile cloth 39 with a width of 250 mm is placed further below. A high elongation cloth 40 with a width of 1200 mm is buried. The side portion 33 has a width of 150 mm in the portion located on the side of the tensile cloth 37, 38, 39 of the bottom portion 32.
mm tensile cloth 41, width 250 mm high elongation cloth 42, width
350mm high elongation cloth 43, and bottom 3 at the bottom
The high elongation cloth 40 explained in 2 is buried therein. The inclined part 34 has high elongation cloth 41, 42 of the side part 33,
43, a tensile cloth 44 with a width of 225 mm, a tensile cloth 45 with a width of 265 mm, and a tensile cloth 46 with a width of 215 mm, and the above-mentioned high elongation cloth 40 is buried below them. has been done. Only the neck portion 35 and the above-mentioned tensile cloths 45 and 46 are buried. Ear part 3
6, the above-mentioned tensile cloths 45, 46, a tensile cloth 47 above them, and a tensile cloth 48 are buried below them. Note that the thickness of the cover rubber on the upper surface side of this conveyor belt is approximately 5 mm. The thickness of the cover rubber on the bottom side is approximately 2 mm. The hardness of the cover rubber was approximately 63 in Hs.

The trough performance of this conveyor belt is
2. The values were 0.157, 0.195, 0.157, 0.280, and 0.141 for the side portion 33, slope portion 34, neck portion 35, and ear portion 36, respectively.

Note that this cylindrical conveyor belt was also manufactured in the same manner as the cylindrical conveyor belt of Example 1.

This cylindrical conveyor belt was mounted on a cylindrical conveyor device having a diameter of 382 mm as shown in FIG.

The cylindrical conveyor belt of this example was deformed into a substantially perfect circular shape by five cylindrical guide rollers. Furthermore, this conveyor belt was able to maintain a relatively close to perfect circular shape even in the curved portion of the conveyor device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a cylindrical conveyor belt according to a first embodiment of the present invention, FIG. 2 is a sectional view of a main part of the cylindrical conveyor belt of FIG. 1 mounted on a cylindrical conveyor device, 3 is a cross-sectional view of a main part of a cylindrical conveyor belt according to a second embodiment of the present invention, FIG. 4 is a cross-sectional view of a main part of a cylindrical conveyor belt according to a third embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view of the main part of the cylindrical conveyor belt of the embodiment mounted on a cylindrical conveyor device, FIG. 6 is a cross-sectional view of the main part showing a modification of the cylindrical conveyor belt of the third embodiment, and FIG. A sectional view of a cylindrical conveyor belt according to a fourth embodiment of the present invention,
FIG. 8 is a sectional view of the main part of the cylindrical conveyor belt of the fourth embodiment mounted on a cylindrical conveyor device;
FIG. 9 is a cross-sectional view of a cylindrical conveyor belt according to a fifth embodiment, and FIG. 10 is a schematic cross-sectional view of a conventional conveyor belt during curved running. 1... Conveyor section, 2, 11, 21, 36...
Ears, 3, 12, 14, 20, 35... Neck, 1
7, 32... bottom, 18, 33... side, 19,
34...Slope part.

Claims (1)

[Scope of Claims] 1. It has an endless shape and is composed of a central conveyor part in a cross section and a pair of ears integrally formed at both ends of the conveyor part, and the pair of ears are brought into contact with each other by a pair of pinching rollers, the end face of the joined ear part is regulated by an end roller, and the conveyor part is formed into a cylindrical shape by a pair of guide rollers and is pushed upward, so that the conveyor part The conveyor belt is a cylindrical conveyor belt that presses the ears at both ends of the section against the end roller, and the conveyor section has a bottom section located at the centermost point in the cross section and forming a cylindrical bottom, and a bottom section on both sides of the bottom section. a pair of side parts located on the sides and forming a cylindrical side wall; a pair of inclined parts located on the outside of each of the pair of side parts and forming an oblique upper part of the cylinder; It consists of a neck part located between the inclined part and the ear part and forming a cylindrical opening, and the stiffness of the neck part in the transverse direction is greater than the stiffness of the bottom part, the side part, the inclined part and the ear part in the transverse direction. A cylindrical conveyor belt that is characterized by its small size. 2. The cylindrical conveyor belt according to claim 1, wherein the rigidity of the side portion in the transverse direction is smaller than the rigidity of the bottom portion and the inclined portion in the transverse direction. 3. The cylindrical conveyor belt according to claim 2, wherein the rigidity of the bottom part in the transverse direction is smaller than the rigidity of the inclined part in the transverse direction. 4. Claim 1, wherein at least one central reinforcing layer is provided that communicates the ears in the transverse direction.
Cylindrical conveyor belt as described in section. 5. The cylindrical conveyor belt according to claim 4, wherein the upper and lower skin portions of the ears are formed of a wear-resistant material. 6. The cylindrical conveyor belt according to claim 1, wherein a groove extending in the longitudinal direction is formed on at least one surface of the neck.