JPH08609B2 - Belt conveyor equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor device for loading and carrying articles.

[0002]

2. Description of the Related Art The most universal belt conveyor device is shown in FIG.
As shown in FIG. 3, an endless belt 1 is wound around a substantially cylindrical drive pulley 2 and a tail pulley (not shown) arranged at the ends, and an intermediate portion of the belt 1 is supported from below by a carrier 3 and a return roller 4. There is. The belt 1 on the upper side is supported by a carrier 3 in which three rollers 5 are arranged in parallel in the transport direction, with the rollers 5 on both sides being attached in an inclined state with both edges higher than the intermediate portion. The lower belt 1 is supported by a horizontally arranged return roller 4, and the belt 1 is pushed up from below by a snap pulley 6 near the drive pulley 2.

As shown in FIGS. 6 and 7, the carrier 3
The three rollers 5 constituting the above are respectively supported by bearings 8 fixed to the frame body 7, abut against the curved belt 1, and rotate in the directions shown by the arrows. The bearing 8 supporting the return roller 4 is also fixed to the frame body 7.

Further, a skirt consisting of a skirt board made of metal and a skirt made of rubber is also installed above the belt so that the spillage does not occur even if the loading capacity is increased.

Further, as shown in FIGS. 9 and 10, there is one in which an upper belt 1 is housed in a pipe 9 for conveying grains (see Japanese Patent Application No. 1-21965). A slit 10 is formed at the lower end of the pipe 9 so that the upper belt 1 can be inserted. Further, the lower belt 1 is supported by a return roller 4 suspended horizontally. In addition, as shown in FIG. 11, there is also one in which the side end portion of the belt 1 is cut off corresponding to the inclination of the edge portion of the belt 1 and the inclined portion 1a is provided to press-contact the back plate 11 (actual fairness 2-42649). No.).

[0006]

By the way, a portion where the belt 1 changes its shape from a gutter-shaped standard cross section on the way to a flat surface on the upper surfaces of the cylindrical drive pulley 2 and the tail pulley at both ends of the apparatus is called a transition. ing. When the cross-sectional shape of the belt 1 changes during the transition, it is possible to prevent the belt 1 from being stressed if the lengths of the loci of the respective portions of the belt 1 are equal.

Generally, it is impossible to make the loci of the respective parts of the belt 1 equal, and therefore, the difference in the length within 1% of the length of the transition is allowed.
In order to shorten the length of the transition, it is necessary to proportionally reduce the difference in the lengths of the loci of the respective parts as much as possible. Therefore, comparing the center of the belt 1 with the trajectories of both ends, the center of the belt 1 need only move vertically, but the edges of the belt 1 move vertically and transversely, so It has been proposed to give movement to the central portion of the belt 1 to balance it and shorten the transition as much as possible. That is, the height of the upper surface of the end pulley (driving pulley 2) is made higher than the height between the upper surface of the central roller 5 of the carrier 3 and both side ends of the carrier 3 so that the center of the belt 1 and both edges thereof are The lengths of the loci of the parts are made equal.

However, in the prior art, if the drive pulley 2 at the end is raised, the belt 1 will be moved when the load is empty.
Since the middle part of the belt floats up and contacts the upper skirt, the height of the drive pulley 2 cannot be increased, and therefore the length of the locus at both ends of the belt 1 is longer than that of the center part. As it grows, so does the length of the transition. Since the cross-sectional shape of the transition changes depending on its position, it is a difficult problem to support the belt 1 only by the cylindrical roller 5 similar to the standard cross-section.

[0009] Therefore, since the articles to be conveyed are not loaded on the transition, the effective length is short, and the total length of the conveyor device is further increased according to the use length. Also,
Since the belt 1 on the return side is formed in a flat shape, the width of the conveyor device also becomes large. Therefore, the conventional conveyor device has a problem that the installation distance is large and the conveying distance is short, and the working space is narrowed.

On the other hand, at the transition on the drive pulley 2 side, the belt 1 gradually becomes flat and the skirt and the belt 1
Transported items will spill from between. Further, the conveyor device shown in FIG. 9 and the conveyor device shown in FIG. 11 are both in the middle part of the belt 1 and at the side end of the belt 1 and the belt 1.
Since the back plate 11 that supports the belts is parallel, the pressure force at the side edge of the belt 1 is weak, and it is easy for bites such as grain to be conveyed or to be dropped. In addition, the front end of the belt 1 may be further bent and warped from the parallel state, which may cause the article to be bitten rather than being separated from the back plate 11.

Further, in the prior art, the lower width of the skirts arranged on both sides of the belt 1 which is the stacking width is usually 10% less than the belt width, and further 5 cm is narrower than the belt width. Has been done. As described above, there is also a problem that the loading capacity is small.

Further, when the carrier 3 is arranged in the intermediate portion of the belt 1 with a space, the carrier 3 and the carrier 3
Since the belt 1 hangs between and, the belt 1 is wrinkled, and a large gap is formed between both edges of the belt 1 and the skirt. If the gap is eliminated by using the pipe 9 shown in FIG. 9, the frictional resistance with the belt 1 is increased this time, which is a problem in manufacturing a long conveyor device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a belt conveyor device which shortens the transition distance and is efficient.

[0014]

In order to achieve the above object, the present invention comprises a central shaft and side shafts which are parallel to a central part and both side parts of a folded part of an endless belt via a plurality of universal joints. An outer wheel having a connecting shaft, an inner pulley attached to the central shaft, an inner wheel having a plurality of spherical shafts on the outer circumference on both sides of the inner pulley, and an outer wheel having a plurality of spherical shafts on the inner side of the side shaft. A plurality of liners are attached to each spherical axis of the inner wheel and the outer wheel to form a cylindrical outer pulley, and a connecting pulley composed of the inner pulley and the pair of outer pulleys is arranged. Characterize.

In the above apparatus, both edges of the belt are bent upward, and the tips thereof are supported by a substantially vertical, continuous vertical supporter with an intersection angle appropriately smaller than the friction angle, and both edges of the belt are supported. The feature is that the upper surface is obliquely cut at an appropriate intersection angle.

The above-mentioned apparatus is characterized in that, in the intermediate portion of the belt, the central portion of the belt is supported from below by a support liner continuous in the longitudinal direction.

[0017]

Since the present invention is configured as described above, the connecting pulley is arranged at the position of the driving pulley, the tail pulley, the snap pulley, etc., and becomes the driving pulley by driving the connecting shaft. When the connecting shaft is driven, the central shaft and the side shaft rotate via the universal joint, so that the inner pulley rotates. Since the liner of the outer pulley is supported via the spherical shaft, it can be bent in the normal and tangential directions of the outer pulley, and when the central shaft and side shafts are not in a straight line, the outer pulley is In contrast, the outer pulley rotates in the wheel rotation direction while being inclined. Although the width in the vertical direction increases when the liner rotates, the mounting gap of the liner may be increased.

Further, since the belt rides on the connecting pulley, when the outer pulley is tilted and the belt is rotated within the range of the shear deformation capacity of the belt, the cross-sectional shape of the lower belt becomes the same as that of the upper belt. Become. Therefore,
Since the belt on the return side is bent to reduce the lateral width of the device, the space in the transverse direction can be reduced.

Next, the length of the transition will be described. When the outer pulley is tilted and the belt is rotated,
The amount of vertical movement of both side ends of the belt is small, and therefore, the length of the locus of both side ends of the belt is short.

Further, since both ends of the belt are supported by the continuous supporter, the skirt which is required in the prior art is not necessary, and even if the belt floats when there is no empty load or conveyed goods, there is no problem. The height of the entire pulley can be increased and the lengths of the loci at both ends can be shortened so that the lengths of the loci at both ends of the belt and the center are equal.

By the above-mentioned means, the length of the trajectory of the shortened belt is small, but the length of the transition is 100, which is the difference between the trajectories, because the elongation rate of the belt is suppressed within 1%. This is equivalent to double the length, and when converted to the transition length, it will be significantly shorter. In this way, both the width and the length of the belt can be reduced.

Further, in the transition, the cross section in the transverse direction is complicated, but the shape of the belt in the longitudinal direction is a straight line. Therefore, if the width of the support liner is made small and the number of the support liners is made large, the support liner becomes a curved surface. No need. Therefore, the belt positioned at the transition can be entirely supported from below, and can be loaded on the transition.

Next, since the belt is bent upward between the both edges of the belt and the back plate supporting the portion,
Needless to say, the front end of the belt is pressed against the back plate by the deformation resistance of the belt in the direction perpendicular to the belt surface.
Further, when the inclined surface is formed at the side end of the belt, it can be further pressed against the back plate by the weight of the conveyed product placed at this position.

Further, since the supporter is installed almost vertically and the angle of intersection with the belt is made appropriately smaller than the friction angle between the two, the angle of intersection between the belt and the supporter is left sufficiently large, so that the belt surface has a large angle. Since the horizontal component force of the deformation resistance works, the pressure force between the belt and the supporter is extremely large. Therefore, the conveyed product is prevented from being caught between the belt and the supporter supporting the belt, and the conveyed product is not spilled. Further, since the supporter is arranged outside the belt, the loading amount can be increased also from this surface.

Also, by increasing the angle of intersection of the roots of the belts, the belts will not be separated from the supporter even if the tips warp considerably. In other words, since the elasticity of the tip of the belt is very large, even if a carrier is used, the conveyed product will not be spilled even if the belt is slightly lowered in the meantime. Further, even if the belt rises to some extent at the carrier position, the crossing angle is appropriately smaller than the friction angle, and therefore the belt does not flip over. Therefore, in the case of a long conveyor, the friction resistance can be reduced by using the carrier.

Further, since the area of the supporter supporting the belt from the side surface and the support liner supporting the belt from the lower surface is small, it is possible to use a material that is resistant to abrasion such as ceramics and ceramics and has a small friction coefficient, so that a small size without using a carrier is used. Even in the belt conveyor device, wear and friction resistance can be reduced.

Further, before contacting the pulley, the element of the belt, which was rectangular, is deformed into a parallelogram in front of the pulley. Therefore, the present invention has a new problem that the belt is damaged. As for short and small belts, belts having considerably large deformability are already on the market even under the current circumstances. Also, in a long conveyor, the required tension is applied to the central part to improve the belt so as to enhance the shear deformation capacity of both sides, the inclination of the pulley is increased, and the load capacity is increased. There is room to reduce the length of the transition.

[0028]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, as shown in FIG. 1, a connecting shaft 12 is attached to the folded portion of the belt 1, and the connecting shaft 12 uses four universal joints 13, and a pair of side shafts 14 are provided on both sides. An inclined shaft 15 and a central shaft 16 are arranged between the side shafts 14. By holding the pair of side shafts 14 horizontally and narrowing the distance between them, the central shaft 16 is positioned horizontally downward.

The height difference between the side shaft 14 and the central shaft 16 is appropriately increased so as to maximize the carrying capacity per unit width within the range where the shear deformation of the belt 1 is allowed. Further, the height of the drive pulley 2 is determined so that the lengths of the loci of the center of the belt 1 and the both ends thereof, and thus the elongation rate, become equal.

An inner pulley 17 is fixed to the central portion of the central shaft 16, and inner wheels 19 having a plurality of spherical shafts 18 on the outer circumference are attached to both ends of the central shaft 16. An outer wheel 20 is fixed near the inner end of the side shaft 14, and a plurality of spherical shafts 18 are provided on the outer periphery of the outer wheel 20. And the inner wheel 19
A plurality of liners 21 are installed between the outer wheel 20 and the outer wheel 20.
At this time, each spherical shaft 18 is a spherical bearing formed on the liner 21.
Attached to 22. An outer wheel between liners 21
A gap of an appropriate size is provided so that the liners 21 do not come into contact with each other when the liners 21 come right next to the inner wheel 19 and the inner wheel 19.

Therefore, the connecting pulley 24, which has a pair of outer pulleys 23 formed by a plurality of liners 21 on both sides of the inner pulley 17, reverses the belt 1.

Next, a belt conveyor device having a short overall length will be described with reference to FIGS. 2 and 3. The inner pulley 17 of the connecting pulleys 24 may be omitted in an extremely small conveyor.

As shown in FIG. 2, the drive pulley 2 uses a connecting pulley 24 to rotate the connecting shaft 12. The configurations of the tail pulley 25 and the snap pulley 26 are the same as those of the drive pulley 2, and the connecting shaft 12 is adapted to freely rotate. Further, the belt 1 is made to circulate outside the drive pulley 2 and the tail pulley 25, and the belt 1 is snapped from the bottom in the vicinity of each of them.
Pushed up by 26. Further, the shaft of the tail pulley 25 is tensioned by the spring 27.

The intermediate portion of the belt 1 is inserted into a cylindrical frame 28, and the frame 28 has a pipe 29 arranged in the upper stage so as to hold the upper belt 1 and the lower belt 1,
A semicircular semicircular portion 30 is arranged in the lower stage to form two stages. The upper and lower stages are provided with a vertical member 31 and a diagonal member 32 on the outside to be integrated, and the connecting portion has a truss structure. Further, as shown in FIG. 3, the supporter 33 is fixed to both sides inside the pipe 29 by extending in the conveying direction, and the T-shaped support liner 34 is similarly fixed to the slit formed in the lower surface of the pipe 29. ing.

The back surface of the belt 1 is covered with Teflon or urethane, and the upper surfaces of the side edges are cut off at an appropriate angle. The supporter 33 and the support liner 34 are made of ceramics or ceramics. Frame 28
Both ends of the belt 1 inserted through the supporter 33 are supported by the supporters 33, and the central portion is supported by the support liner 34.

The height of the support liner 34 is determined so that the angle of intersection between the tip of the belt 1 and the pipe 29 is appropriately smaller than the friction angle between the two. In the transition, the frame 28 is deformed so that the heights of the supporter 33 and the support liner 34 are linearly increased as they approach the drive pulley 2 and the tail pulley 25, respectively, and the support liner 34 is made smaller in the width direction. It is divided into a linear end.

Next, the operation will be described. Since the belt 1 of a short belt conveyor device has a small thickness and is easily sheared and deformed, therefore, the outer pulley 23 of the drive pulley 2 and the outer pulley 23 of the tail pulley 25 have a large inclination to have a standard cross section. Since the depth can be increased, the carrying capacity per unit width is increased. Further, since the outer pulley 23 of the drive pulley 2 rotates in the same vertical plane, the shape of the belt 1 on the lower surface of the drive pulley 2 is exactly the same as the upper surface, and the support method by the supporter 33 and the support liner 34 is completely the same. Since it is the same, the width on the return side becomes smaller.

Next, the length of the transition will be described. If the drive pulley 2 is raised, the belt 1 may float up when there is little empty load or conveyed goods. However, in the present invention as well, since the supporter 33 is outside the belt 1, even if the belt 1 floats, the supporter 33 Does not get in the way.
Further, since the supporter 33 is mounted in a substantially vertical state, even if the belt 1 floats, the tip does not separate from the supporter 33. Further, the height position of the support liner 34 is such that the belt 1 and the supporter are
Since the angle of intersection of 33 is determined to be appropriately smaller than the friction angle of both, the belt 1 will not turn up even if it rises.

Therefore, even if the heights of the drive pulley 2 and the like are increased, there is no problem. Therefore, as described above, the height positions of the drive pulley 2 and the tail pulley 25 are set so that the center portion of the belt 1 and the side ends thereof extend. The transitions can be shortened by making the rates equal.

In addition, the length of the transition can be shortened by increasing the inclination of the outer pulley 23 within the deformation capacity of the belt 1.

As shown in FIG. 3, the support liner 34 is continuous in the part of the standard cross section in the middle of the frame 28, the belt 1 does not droop greatly, and therefore, the belt 1 does not have large wrinkles. There is no gap between the and supporter 33. In addition, in the transition, as described above, the length is short, and the shape in the longitudinal direction is linear. Therefore, if the support liner 34 is divided in the transverse direction and the width of each support liner 34 is narrowed and arranged slightly radially, the belt 1 can be evenly supported from below. Therefore, the belt 1 does not hang down during the transition.

The first force of pressing the tip of the belt 1 to the supporter 33 is due to the deformation resistance in the direction perpendicular to the surface of the belt 1 because the belt 1 is bent. Secondly, since the side edges of the belt 1 are inclined, they are due to the component force of the weight of the load. Thirdly, since an appropriate angle of intersection is provided between the belt 1 and the supporter 33, it is due to the horizontal component force of the deformation resistance in the plane of the belt 1. Therefore, unlike the prior art, the pressure bonding force between the belt 1 and the supporter 33 is very strong.

When the gutter-shaped belt 1 meanders up and down, the part that hangs down and protrudes downward is widened, and the part that rises and protrudes upward is narrowed, and the edge of the belt 1 moves in a plane to move the belt. A gap is likely to be formed between the support 1 and the supporter 33, but it is difficult to form a gap because the belt 1 is continuously supported by the supporter 33 and the support liner 34.

Next, a local problem of the contact portion between the tip end and the supporter 33 due to the meandering of the belt 1 will be described. Since the angle of intersection between the belt 1 and the supporter 33 is made appropriately smaller than the friction angle, the belt 1 will not turn over when the belt 1 is lifted. When the belt 1 meanders, the tip of the belt 1 needs to be curved sufficiently large so that the belt 1 is in close contact with the supporter 33. However, the tip of the belt 1 is greatly curved and the tip of the belt 1 is warped, so that the supporter 33
The opposite effect is obtained if the distance is away from, but both conditions can be satisfied by appropriately selecting the intersection angle of the cut portion at the tip of the belt 1.

In order to satisfy both of the above two conditions, it is necessary that the angle of intersection between the tip of the belt 1 and the supporter 33 is large, but since the upper surface of the belt 1 is cut off, the supporter 33 is cut. The angle of intersection on the back side that touches is not damaged at all. Therefore, even if the belt 1 meanders up, down, left, and right to some extent, the conveyed items are not spilled, so that the loading amount can be increased.

Although the support liner 34 is rubbed by the belt 1, it is not worn because it is a hard material such as ceramics or ceramics. Also, instead of the carrier, the pipe
Since the liner 34 is provided on the lower surface of 29, the coefficient of friction is somewhat increased, but the belt 1 is covered with urethane, and it is not a problem in a short conveyor because the original horsepower is small. A large belt conveyor device in which frictional resistance is a problem will be described later.

As shown in FIG. 3, the article to be conveyed is covered with the pipe 29 of the frame 28, and the back surface of the belt 1 which is in contact with the article to be conveyed is covered with the semicircular portion 30, which is sanitary. Also, since the frame 28 has a truss structure,
The number of columns is small and does not interfere with work.

Next, a belt conveyor device having a large length will be described with reference to FIGS. 4 and 5. A duck 1b is formed in the central portion of the belt 1 which is in contact with the inner pulley 17, and the number of plies and the thickness are sufficiently increased to correspond to the weight of the conveyed product and the tension of the belt 1. The edge portion of the belt 1 is made as thin as possible so as to reduce resistance to shear deformation and bending deformation.

The radius of the outer pulley 23 is equal to that of the inner pulley 17.
The thickness of the belt 1 is larger than that of the belt 1.
The same applies to the tail pulley 25, the snap pulley 26, and the suspension pulley 36 described later.

Next, the structure of the frame 28 will be described. Plate girders 37 are provided on both sides of the belt 1,
The horizontal beams 38 are fixed to the upper and lower two stages at appropriate intervals. A cover plate 39 and a bottom plate 40 are attached to the upper and lower ends of the plate girder 37 of the frame 28, respectively.

A support liner 34 is provided at the transition portion of the belt 1, and a transverse beam 38 is provided at the middle portion.
The carrier 3 is fixed to the. The width of the carrier 8 can be made narrower than that of the prior art, and the tip of the belt 1 is bent upward and supported by the supporter 33 fixed to the plate girder 37.

Further, according to the convention of a long belt conveyor device, the shaft of the tail pulley 25 is fixed, and two snap pulleys 26 are provided near the drive pulley 2.
A suspension pulley 36 is loaded on the upper surface of the lower belt 1, and a weight 41 is suspended on the suspension pulley 36. The suspension pulley 36 configuration also uses a connecting pulley 24.

Next, the operation will be described. Since the duck 1b is formed in the central portion of the belt 1 to enhance the resistance, it is possible to bear the tension of the belt 1 only in the central portion. Therefore, by making the thickness of the sleeve portion of the belt 1 thin, a large shear deformation is possible, and the inclination of the outer pulley 23 can be increased and the length of the transition can be shortened.

With respect to the transition portion, since the support liner 34 is provided in the longitudinal direction, it is possible to load the articles to be conveyed at the transition on the tail pulley 25 side. Therefore, it is possible to shorten the total length of the belt conveyor device. In addition, there is no load spill in the transition portion on the drive pulley 2 side.

Further, since the carrier 3 is used in the middle portion of the belt 1, the belt 1 can be lifted right above the carrier 3, but the angle of intersection between the belt 1 and the supporter 33 is appropriately smaller than the friction angle. Therefore, the belt 1 does not roll over and a large gap is not formed. Also, carrier 3
In the middle of the, the belt 1 is folded upwards,
Since it protrudes downward, the upper width of the gutter-shaped belt 1 tends to be narrowed, but as described above, the both ends of the belt 1 are strongly pushed up by the supporters 33, so that the strong force to open the belt 1 is obtained. Since the force is acting inside the belt 1, the pressure bonding force with the supporter 33 is reduced, but no gap is generated.

The upper surface of the edge of the belt 1 is cut off,
Its elasticity allows it to fill small gaps.
Therefore, even if the belt 1 slightly meanders up and down, it does not spill over. Therefore, since the carrier 3 can be used to reduce wear and resistance, it can be used for a long belt conveyor device.

Further, as compared with the prior art, extra frictional resistance between the belt 1 and the supporter 33 is generated. On the other hand, first, the end of the belt 1 is bent to increase the depth of the conveyor. Second, as mentioned above, there are no spills. Third, the loading width can be extended to the full width of the belt. Therefore, the load capacity can be increased more than the increase in the frictional resistance.

Further, since the frame 28 is composed of the plate girder 37, the number of columns is small, and therefore it does not interfere with the work. Further, since the belt 1 is surrounded by the plate girder 37, the cover plate 39 and the bottom plate 40 on four sides, it does not get wet. Further, when handling cement or other powder, the surrounding environment can be improved because it does not scatter.

[0059]

Since the present invention is configured as described above, when a belt is hung on a connecting pulley having an outer pulley that rotates in the longitudinal direction and rotated, the locus between the central portion and the edge portion of the belt is The distances are almost the same, the transitions can be shortened, the gutter-like curvature can be increased, and all the constituent requirements have been comprehensively improved, so the length and width can be reduced and spillage can be prevented. Without, it is possible to increase the loading capacity. Further, the applicable range is extremely wide, from a belt conveyor having a short length to a belt conveyor having a large length. Therefore, the benefit of the present invention to society is extremely large.

[Brief description of drawings]

FIG. 1 is a front view of a connecting pulley according to the present invention.

FIG. 2 is a side view of a short and small belt conveyor device using the connecting pulley shown in FIG.

FIG. 3 is a sectional view of a frame of the belt conveyor device shown in FIG.

4 is a sectional view of a frame of the belt conveyor device shown in FIG.

FIG. 5 is a side view of an elongated belt conveyor device using the connecting pulley shown in FIG.

FIG. 6 is a front view of a carrier used in a conventional belt conveyor device.

FIG. 7 is a side view of the carrier shown in FIG.

FIG. 8 is a perspective view of a conventional belt conveyor device.

FIG. 9 is a perspective view of another conventional belt conveyor device.

10 is a cross-sectional view of the belt conveyor device shown in FIG.

FIG. 11 is a cross-sectional view showing a belt end portion of a conventional belt conveyor device.

[Explanation of symbols]

 1 Belt 12 Connection Shaft 13 Universal Joint 14 Side Shaft 16 Center Shaft 17 Inner Pulley 18 Spherical Shaft 19 Inner Wheel 20 Outer Wheel 21 Liner 23 Outer Pulley 24 Connection Pulley 33 Supporter 34 Support Liner

Claims (3)

[Claims] 1. An endless belt folding part is provided with a connecting shaft composed of a central shaft and side shafts parallel to a central part and both sides via a plurality of universal joints, and an inner pulley is mounted on the central shaft. An inner wheel having a plurality of spherical shafts on the outer circumference is attached to both sides of the inner pulley, an outer wheel having a plurality of spherical shafts on the outer circumference is attached to the inner side of the side shaft, and a plurality of spherical wheels of the inner wheel and the outer wheel are attached. A belt conveyor device, wherein a liner is attached to form a cylindrical outer pulley, and a connecting pulley composed of the inner pulley and the pair of outer pulleys is arranged. 2. The belt is supported at both edges by a supporter with a cross angle that is appropriately smaller than a continuous friction angle of a substantially flat plate, and the upper surfaces of both edges of the belt are obliquely cut at an appropriate cross angle. The belt conveyor device according to claim 1, which is characterized in that. 3. The belt conveyor device according to claim 1, wherein in the intermediate portion of the belt, the central portion of the belt is supported from below by a support liner continuous in the longitudinal direction.