JP5651987B2 - Air-floating belt conveyor - Google Patents

Description

  The present invention relates to an air levitation belt conveyor, and more particularly, an air levitation belt conveyor capable of preventing contact between a frame and a conveyor belt from the start of use of the conveyor belt without causing trouble in conveying a conveyed product. About.

  Conventionally, a so-called air-floating belt that runs a conveyor belt in a state of being lifted by air pressure from a bowl-shaped (arc-shaped) or cylindrical frame as one of means for transporting a transported material such as powder or granular material. Conveyors are known.

  In this air levitation belt conveyor, the conveyor belt running in the frame is curved along the inner surface of the lower part of the frame. However, if the rigidity in the belt width direction is high, the end of the belt contacts and wears the inner surface of the frame. The conveyor belt may be damaged or the operation of the belt conveyor may be adversely affected. In particular, at the beginning of use of the conveyor belt, such a problem is likely to occur because the conveyor belt is not familiar with the operating environment and is in a hard state immediately after manufacture.

  In order to solve the above-mentioned problem, as in Patent Document 1, a concave belt extending along the length direction is formed on the lower surface of the conveyor belt at intervals in the belt width direction, thereby forming a conveyor belt. It is conceivable to improve the flexibility of the belt in the width direction of the belt and improve the floating force of the conveyor belt using compressed air in the groove as an air spring.

  However, if the flexibility of the conveyor belt is improved from the beginning of use of the conveyor belt as described above, the flexibility becomes very large when the conveyor belt is adapted to the work environment. There is a risk of it coming.

JP 2001-315934 A

  An object of the present invention is to provide an air-floating type belt conveyor that can prevent contact between a frame and a conveyor belt from the start of use of the conveyor belt without hindering conveyance of a conveyed product.

The air levitation belt conveyor of the present invention that achieves the above-mentioned object is constructed by inserting a conveyor belt inside a bowl-shaped or cylindrical frame and blowing the compressed air from the lower surface side of the conveyor belt so that the upper surface side In the air levitation belt conveyor for transporting a transported article on the belt, a protrusion made of a rubber composition extending from the center in the belt width direction to both ends of the belt is provided on the lower surface of the conveyor belt at a predetermined interval in the belt longitudinal direction. And the height of the ridge is gradually lowered toward the end of the belt .

  According to the air levitation belt conveyor of the present invention, protrusions made of a rubber composition extending from the center in the belt width direction to both ends of the belt are formed on the lower surface of the conveyor belt at predetermined intervals in the belt longitudinal direction. Therefore, the compressed air blown to the lower surface of the conveyor belt flows evenly to both ends of the belt through the flow path formed between the ridges, and gives sufficient lifting force to the end of the belt. Can be prevented from coming into contact with the frame. Further, although the rigidity of the conveyor belt is slightly increased at the start of use, the ridges are reduced or eliminated due to friction with a pulley or the like thereafter, so that the conveyance of the conveyed product is not affected.

  It is desirable that the tip of the ridge is located inside the belt end. By doing so, an increase in the rigidity of the belt end can be suppressed, and the floating effect can be used effectively.

It is necessary that the height of the ridge gradually decreases toward the belt end. By doing so, an increase in the rigidity of the belt end can be further suppressed.

  It is desirable that the protrusions have a curved shape that is concave with respect to the running direction of the conveyor belt. By doing so, it prevents the compressed air from flowing out in the direction opposite to the belt running direction, increases the amount of compressed air flowing into the flow path between the ridges, and increases the floating force of the belt end. Can be.

  It is desirable that the width of the flow path formed between the protrusions is gradually narrowed toward the belt end. By doing so, the levitation force at the belt end can be increased compared to the center in the belt width direction.

  In addition to the above-described protrusions extending in the belt width direction, it is desirable to provide protrusions extending in the belt longitudinal direction. By doing so, the compressed air blown from the air holes can be uniformly guided in the belt width direction, and part of the compressed air flows out in the longitudinal direction, reducing the frictional resistance between the conveyor belt and the frame. can do.

  The protrusions extending in the belt width direction and the belt longitudinal direction are preferably formed of a rubber composition having lower abrasion resistance than the rubber composition forming the lower surface of the conveyor belt. By doing so, only the portion of the ridge is selectively worn and reduced or disappears, so that the strength of the conveyor belt itself can be prevented from being affected.

It is sectional drawing of the pneumatic belt conveyor which consists of embodiment of this invention. It is a top view of the lower surface in the 1st example of a conveyor belt. It is sectional drawing shown by AA arrow in FIG. It is a top view of the lower surface in the 2nd example of a conveyor belt. It is a top view of the lower surface in the 3rd example of a conveyor belt. It is a top view of the lower surface in the 4th example of a conveyor belt. It is a top view of the lower surface in the 5th example of a conveyor belt. It is a top view of the lower surface in the 6th example of a conveyor belt.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an air levitation belt conveyor according to an embodiment of the present invention.
This air levitation belt conveyor (hereinafter simply referred to as “belt conveyor”) has an endless air levitation conveyor belt (hereinafter simply referred to as “conveyor belt”) inside a cylindrical metal frame 1. 2 conveys a transported object (not shown) placed on the upper surface 3 while floating along the frame 1. A number of air holes 4 are provided in the lower part of the frame 1 along the longitudinal direction, and compressed air 5 is blown from a compressor (not shown) through the air duct 6 and blown to the center of the lower surface 7 of the conveyor belt 2. Thus, the conveyor belt 2 is levitated. The belt width direction of the conveyor belt 2 is curved along the lower inner surface of the frame 1, and the longitudinal direction is wound around a pair of pulleys that are rotationally driven by an electric motor (not shown).

  On the lower surface 7 of the conveyor belt 2, as shown in FIG. 2, protrusions 9 made of a rubber composition from the center in the belt width direction toward the belt end portions 8 and 8 have a predetermined interval in the belt longitudinal direction. Is provided. In addition, the top view of the conveyor belt 2 after FIG. 2 is a thing at the time of making a belt into a flat state.

  In this way, by providing the protrusions 9 on the lower surface of the conveyor belt, the compressed air 5 blown from the air holes 4 to the lower surface 7 of the conveyor belt 2 causes the belt ends 8 and 8 to flow between the protrusions 9. Therefore, the belt end 8 can be prevented from coming into contact with the frame 1 from the start of use. Further, the rigidity of the conveyor belt 2 is slightly increased at the start of use, but after that, the ridge 9 is worn away by friction with the pulley or the like and shrinks or disappears, so that it does not affect the conveyance of the conveyed item. .

  It is desirable that the tip of the ridge 9 is located inside the belt end 8. By doing in this way, the increase in the rigidity in the belt edge part 8 which is easy to contact the flame | frame 1 can be suppressed.

  The height and width of the ridge 9 are not particularly limited, but when the conveyor belt 2 starts using the pulley, it does not generate abnormal vibration and the conveyor belt 2 becomes familiar with the operating environment. The height should be 0.1 to 3.0 mm, preferably 0.3 to 1.0 mm, and the width should be 0.5 to 5.0 mm, preferably 1.0 so as to shrink or disappear due to wear. It is good to be -3.0 mm.

  Further, as shown in FIG. 3, it is preferable that the height of the ridge 9 is gradually lowered toward the belt end portion 8. By doing in this way, the increase in the rigidity in the belt edge part 8 can further be suppressed.

  As shown in FIG. 4, the shape of the protrusion 9 is not linear with respect to the longitudinal direction of the belt as shown in FIG. 2, but with respect to the belt running direction (indicated by an arrow in the figure). It is desirable to have a concave curved shape. By doing in this way, it can prevent that the compressed air 5 flows out to the opposite side to a belt running direction, and can increase the quantity of the compressed air 5 which flows into the flow path 10.

  It is desirable that the width of the flow path 10 formed between the protrusions 9 is gradually narrowed toward the belt end 8. Examples of such a ridge 9 include a shape in which the ridge 9 is branched in the vicinity of the belt end 8 to the opposite side of the belt traveling direction (see FIG. 5), and the ridge 9 as it goes toward the belt end 8. The shape (refer FIG. 6) which gradually enlarges the width | variety to the opposite side to a belt running direction is mentioned. By doing so, the levitation force of the belt end 8 can be increased compared to the center.

  In any of the above-described embodiments, for example, as shown in FIGS. 7 and 8, the protrusion 11 extending in the longitudinal direction is provided at the center in the belt width direction, that is, at a position facing the air hole 4 of the frame 1. May be.

  In this way, the compressed air 5 blown from the air holes 4 can be guided evenly in the belt width direction, and a part of the compressed air 5 flows out in the longitudinal direction between the conveyor belt 2 and the frame 1. The frictional resistance can be reduced.

  Moreover, it is desirable that the rubber composition for forming the protrusions 9 and 11 has lower wear resistance than the rubber composition for forming the lower surface 7 of the conveyor belt 2. In this way, only the portions of the protrusions 9 and 11 are selectively worn and reduced or disappear, so that the strength of the conveyor belt 2 itself can be prevented from being affected.

DESCRIPTION OF SYMBOLS 1 Frame 2 Conveyor belt 3 Upper surface 4 Air hole 5 Compressed air 6 Air duct 7 Lower surface 8 Belt end 9 Projection 10 Channel 11 Projection (in the belt longitudinal direction)

Claims (6)

In an air levitation belt conveyor that inserts a conveyor belt inside a bowl-shaped or cylindrical frame and blows the compressed air from the lower surface side of the conveyor belt and floats it, and loads and conveys a material to be conveyed on the upper surface side.
The lower surface of the conveyor belt, the protrusion made of a rubber composition extending from the center in the belt width direction to the belt end portions, so as to form at predetermined intervals in the longitudinal direction of the belt, the height of the protrusion is belt end An air levitation belt conveyor characterized by being gradually lowered toward the part .   The air levitation type belt conveyor according to claim 1, wherein a tip end of the protrusion is positioned inside a belt end portion. The air levitation belt conveyor according to claim 1 or 2 , wherein the protrusion has a curved shape that is concave with respect to a traveling direction of the conveyor belt. The air-floating belt conveyor according to any one of claims 1 to 3 , wherein the width of the flow path formed between the protrusions is gradually narrowed toward the belt end. The air levitation belt conveyor according to any one of claims 1 to 4 , wherein a ridge extending in a belt longitudinal direction is provided on a lower surface of the conveyor belt. The air floating belt conveyor according to any one of claims 1 to 5 , wherein the wear resistance of the rubber composition forming the protrusions is lower than that of the rubber composition forming the lower surface of the conveyor belt.