JPH11246020A - Air levitation belt conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a uniform air layer between each trough and a conveyer belt and to prevent to damage to peripheral edges of the conveyer belt and lack of the air layer following deflection of the belt, by specifying interval of two rows of air injection holes provided for each trough for transporting or returning the conveyer belt. SOLUTION: In an air levitation belt conveyer where a transporting trough 2 is arranged at the upper stage of a casing 1 and a returning trough 1A is arranged at the lower stage, the returning trough 1A is constituted so that it is a V-shaped trough and only the central part of the belt is circular arc. Air injection holes 6A, 6B drilled in the central parts of the transporting trough 2 and the trough 1A for levitating a conveyer belt 3 are provided in two parallel rows, and an interval D between two rows of air injection holes 6A, 6B is set more than twice of maximum deflection quantity during belt running. Thus, a uniform air layer can be formed between each of troughs 2, 1A and the conveyer belt 3, and lack of the air layer following deflection of the belt is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-floating belt conveyor in which a conveyor belt in a trough is levitated by air pressure in conveying a granular material on a belt conveyor, and a belt conveying roller is not used.

[0002]

2. Description of the Related Art Conventionally, in an air levitation belt conveyor, troughs are formed in an arc shape in both a conveying section and a return section.

[0003]

The above-mentioned prior art has the following problems. FIG.
, The belt return portion 12 has no belt loading load, so that the rigidity of the conveyor belt 12A deteriorates the adaptability to the trough, and the peripheral portion of the conveyor belt locally causes friction with the trough 12B, which is likely to cause damage. . Further, when the conveyor belt is eccentric from a predetermined position while the conveyor belt is running, the air flowing out from the air ejection holes 12C is:
It has a drawback that it is deflected to the left or right of the center of the conveyor belt and the formation of a uniform air layer is hindered. Therefore, if the tensile strength of the conveyor belt is increased, the rigidity is also increased, the conformability to the trough is reduced at the belt return portion, and the peripheral portion of the conveyor belt is liable to cause frictional damage with the trough. There was a problem that a uniform air layer could not be maintained due to eccentricity.

[0004] Therefore, the present invention solves the above problems by preventing damage to the peripheral portion of the conveyor belt in the air-floating belt conveyor and forming a uniform air layer even if belt eccentricity occurs in the trough. It is something to offer. That is, A. In the air levitation belt conveyor, when the transport distance is long and the transport amount is large, the belt thickness is increased because the tensile strength of the conveyor belt 3 is increased,
Therefore, the belt rigidity also increases, and the conformability to the trough is reduced in the belt return portion where the belt is not loaded, and the peripheral portion of the conveyor belt comes into local contact with the trough, causing frictional damage. As a countermeasure, the trough is generally arc-shaped in both the transport section and the return section in the air-floating belt conveyor, but the transport section is formed in an arc shape in consideration of the loading efficiency, and the belt return trough 1A is used.
Is formed in a V-shape, and only the central portion of the conveyor belt is formed in an arc shape so as not to cause local friction at the peripheral portion of the conveyor belt. B. If the belt position is eccentric from the predetermined position in the trough to the left or right during the running of the belt, a uniform air layer cannot be formed at the contact portion between the conveyor belt 3 and the trough. The belts are arranged in two rows parallel to the center line, and the interval D between the two rows is set to be at least twice the assumed maximum eccentricity of the conveyor belt 3 so that the belt eccentricity causes the belt eccentricity to move right and left from the belt center position. The drift is prevented and a uniform air layer is formed.

[0005]

In order to achieve the above object, the present invention is as follows. That is, according to the present invention, the transport unit trough 2 is arranged in the upper stage of the casing 1, and the belt return trough 1A is arranged in the lower stage of the casing 1. The shape of the belt return trough 1A is V The central portion of the belt is formed in an arc shape as a shaped trough, so that the conveyer belt 3 can be adapted to the belt return trough 1A, and frictional damage to the peripheral portion of the conveyor belt, which is likely to occur in the air floating belt conveyor, is prevented. Further, the transport side air ejection holes 6A and the return side air ejection holes 6B opened at the center of the conveyor trough 2 for lifting the conveyor belt 3 and the belt return trough 1A are located at the center of the conveyor belt 3 in both troughs. The transport unit air troughs 6A and the return-side air vents 6B are arranged in two rows parallel to the line, and the interval D between the transport side air outlets 6A and the return side air outlets 6B is set to be at least twice the maximum eccentricity during belt running, and 2, a uniform air layer is formed in the gap between the belt return trough 1A and the conveyor belt 3 to prevent the air layer from being lost due to belt eccentricity, and further, a return-side air duct 5B communicating with the return-side air ejection hole 6B. Is formed using a lower end corner of a casing formed by a casing 1, a bottom surface 1A1 of the casing, and a belt return trough 1A. An air floating belt conveyor which is configured to prevent air film lost due to friction damage the belt eccentricity of the conveyor belt the peripheral portion of the turn portions.

[0006]

Embodiments of the present invention will be described with reference to the drawings. 3 and 4, a transport unit trough 2 is arranged in an upper stage of a casing 1, and a belt return trough 1 </ b> A is arranged in a lower stage of the casing 1. The upper conveying section trough 2 is an arc-shaped circular trough to improve the belt loading efficiency, and causes air to be ejected from the conveying side air ejection hole 6A from the conveying side air duct 5A so that the conveyor belt 3 and the conveying section trough 2 An air layer is formed at the contact portion, and the conveyor belt 3 is floated. The bottom of the casing is formed in a V shape as a belt return trough 1A, and the center of the trough is formed in an arc shape to improve the conformability of the conveyor belt 3 to the trough. Conventionally, since the conveyor belt 12A in the belt return portion has no loaded load of the conveyor belt, the rigidity of the belt causes the peripheral portion of the conveyor belt 1 to be locally contacted as shown in FIG.
In order to cause frictional damage of 2A, as shown in FIG. 1, the belt return trough 1A is formed as a V-shaped trough and its central portion is formed in an arc shape to prevent local contact of the conveyor belt 3. The operation of ejecting air from the return-side air ejection holes 6B from the return-side air duct 5B to float the conveyor belt 3 is the same as the above-described conveyance side. The return-side air duct 5B communicating with the return-side air ejection hole 6B includes a side surface of the casing 1 and a bottom surface 1A1 of the casing.
And a bottom return corner of a casing formed by the belt return trough 1A. As a result, the configuration is such that no grooved air duct is provided. The conveyor belt 3 is driven by a drive pulley 7 and an end pulley 8 to drive the belt, and dust adhering to the belt is removed by a belt cleaner 9. Is discharged.

[0007]

EXAMPLES Further, as a result of an experiment under the following conditions,
Very good results were obtained. If the belt width 500 mm, decrease in belt loading of load 0~60kg / m ^2, when the free air supply belt friction tension, if allowed to air floated against the frictional tension, the belt friction tension below 10% It became possible to make it. Also, even if the belt was eccentric to less than 1/2 of the row interval of the air ejection holes, no difference in the frictional tension of the conveyor belt was observed.

[0008]

Since the present invention is configured as described above, the following effects can be obtained. In the prior art, in the air-floating belt conveyor, damage due to local friction is likely to occur at the peripheral portion of the conveyor belt at the belt return portion, and the formation of a uniform air layer is hindered by eccentricity during belt running. (See FIG. 2) In the present invention, the transport unit trough 2
The shape of is a semicircular trough having an arc shape to improve loading efficiency, and the belt return trough 1A is a V-shaped trough to prevent damage to the periphery of the conveyor belt. Also, even if belt eccentricity occurs during belt running, the contact portion between the conveyor belt 3, the transport section trough 2 and the belt return trough 1A can form a uniform air layer by arranging the air ejection holes in two rows. And Further, the return-side air duct 5B communicating with the return-side air ejection hole 6B is formed by using a lower end corner of the casing formed by the casing 1, the bottom surface 1A1 of the casing, and the belt return trough 1A. In addition, the installation of a single grooved air duct can be omitted.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view illustrating the conformability of a belt return section of the present invention in a trough.

FIG. 2 is a conceptual cross-sectional view illustrating the familiarity of a conventional belt return section with a trough.

FIG. 3 is a cross-sectional view of the air levitation belt conveyor in a running direction.

FIG. 4 is an enlarged cross-sectional view in a direction orthogonal to the traveling direction of the air levitation belt conveyor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 1A Trough for belt return 2 Conveyor trough 3 Conveyor belt 4 Conveyed goods 5A Conveyance side air duct 5B Return side air duct 6A Conveyance side air ejection hole 6B Return side air ejection hole 7 Drive pulley 8 End pulley 9 Belt cleaner 10 Transportation Product inlet 11 Conveyance product outlet

Claims (1)

[Claims] 1. A transport trough (2) is arranged at an upper stage of a casing (1), and a belt return trough (1A) is arranged at a lower stage of the casing (1). The shape of (1A) is formed as a V-shaped trough in an arc shape only at the center of the belt, and is formed at the center of the conveyor trough (2) for floating the conveyor belt (3) and the belt return trough (1A). The transfer-side air ejection holes (6A) and the return-side air ejection holes (6B) are arranged in two rows parallel to the center line of the conveyor belt (3) in these troughs. The distance (D) between the air outlet (6A) and the return-side air outlet (6B)
Is to form a uniform air layer in the gap between the conveyor trough (2) and the belt return trough (1A) and the conveyor belt (3) by setting the maximum eccentricity at least twice the amount of eccentricity at the time of running the belt. The return side air duct (5B) communicating with the ejection hole (6B) includes a casing (1), a bottom surface (1A1) of the casing, and a belt return trough (1A).
And an air levitation belt conveyor configured to prevent frictional damage to the peripheral portion of the conveyor belt at the belt return portion and air film loss due to belt eccentricity. .