JP3970490B2 - Air-floating long belt conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elongated apparatus capable of stable conveyance with one machine even in the case of a curved long section in an air-floating belt conveyor for conveying various kinds of bulk materials such as coal and ore. .
[0002]
[Prior art]
In a belt conveyor for transporting various bulk materials such as coal and ore, a belt for transportation is run in a cylindrical casing, and the belt is levitated by supplying air from an air supply hole at the bottom of the casing. Air floating type belt conveyors are known. According to this belt conveyor, loose materials are transported in the casing, so that falling objects and dust generation around the conveyor is remarkably suppressed, and noise is generated because there is no belt support roller in the cylindrical casing. Is also significantly suppressed. Therefore, an air floating type belt conveyor has attracted attention in recent years as an environmentally conscious conveyor.
[0003]
A specific example of a conventionally known air-floating type belt conveyor is shown in FIG. 5. As shown in FIG. 5, an endless belt 1 is wound between a head pulley 4 and a tail pulley 5, and one or both of the pulleys 4 and 5 are wound. Is driven to rotate in the direction of the arrow, and the carrier belt 2 is provided on the upper side of both pulleys 4 and 5 and the return belt 3 is provided on the lower side, and the carrier 14 loaded from the supply chute 6 is conveyed by the carrier belt 2. , Discharged from the discharge chute 7.
[0004]
As shown in FIG. 6, the carrier belt 2 and the return belt 3 are curved so as to be concave upward in the width direction, and are floated by air in the casing 8 supported up and down by the support column 13. The air is blown from the header 10 attached to the lower side of the casing 8 through the air supply holes 9 to the lower surfaces of the carrier belt 2 and the return belt 3. The air in the header 10 is supplied by the branch pipe 11 from the air supply pipe 12 piped along the belt conveyor.
[0005]
[Problems to be solved by the invention]
In the air-floating type belt conveyor as described above, when the transport section is long distance, it is often difficult in the installation environment to construct the conveyor in a straight line. It is necessary to bend the conveyor. The latter is preferable in terms of equipment cost and operation cost.
However, when the conveyor is curved, the carrier belt 2 and the return belt 3 roll as shown in FIG. 1, the belts 2 and 3 deviate from above the air supply holes 9, and the belt contacts the inner surface of the casing 8. There is a risk that it may be damaged or, in extreme cases, operation shutdown.
[0006]
Therefore, the problem to be solved by the present invention is that even in the case of conveying a variety of bulk materials such as coal and ore, even in the case of extending over a curved long section by an air levitation belt conveyor in which the problems of surrounding contamination and noise are remarkably suppressed. It is to enable stable conveyance with one conveyor.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an endless belt that is concavely curved upward in the width direction and travels while being wound between a head pulley and a tail pulley, and the endless belt is moved above the two pulleys. Is a carrier belt, and a lower belt is a return belt. The carrier belt and the return belt are run in a cylindrical casing at a substantially horizontal running portion between the pulleys, and one lower portion of the vertical cross section of the casing. In the air levitation belt conveyor that is levitated by the air supplied from the air supply hole provided in the head , the head pulley and the tail pulley are used as drive pulleys in order to reduce and adjust the tension between the head pulley and the tail pulley of the endless belt. , the winding angle α of the both pulleys as 210 ° to 230 °, no load of the carrier belt An air levitation type long belt conveyor, characterized in that the upper limit of the rolling angle θ and 55 °.
[0008]
According to the present invention , the belt contact surface of the drive pulley is ceramic lagging .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is characterized in that in the air-floating type belt conveyor as shown in FIGS. 5 and 6, the rolling angle θ when the carrier belt 2 is unloaded is 55 ° or less as in the example of FIG. And
As shown in FIG. 5, the target belt conveyor is an endless belt 1 that is wound around a head pulley 4 and a tail pulley 5 and travels. The carrier belt 2 is above the pulleys 4 and 5, and the return is at the bottom. As shown in FIG. 6, the carrier belt 2 and the return belt 3 are curved so as to be concave upward in the width direction, and float in the casing 8 by the air supplied from the air supply holes 9. It is something to be made.
[0010]
In FIG. 5, when the direction of the carrier belt 2 is changed to the return belt 3 by the head pulley 4, and when the direction of the return belt 3 is changed to the carrier belt 2 by the tail pulley 5, the belt reversing means (not shown) is used. Both belts 2 and 3 are curved so as to be concave upward in the width direction.
[0011]
The endless belt 1 can be run by rotating one or both of the head pulley 4 and the tail pulley 5 or by separately providing a driving pulley. In the example of FIG. 6, the levitation air is supplied from the air supply pipe 12 piped along the conveyor to the header 10 through the branch pipe 11 and supplied from the air supply hole 9 into the casing. The conveyed product 14 can be supplied onto the carrier belt 2 from the charging chute 6 and discharged from the discharge chute 7 as shown in FIG.
[0012]
Since the carrier belt 2 and the return belt 3 run while being tensioned between the head pulley 4 and the tail pulley 5, they roll at the curved portion of the casing 8 as in the example of FIG. 1. FIG. 1 shows an example of the carrier belt 2, and the casing 8 is greatly curved with the right side of the paper surface protruding.
[0013]
Since the sum W of the weight of the carrier belt 14 and the weight of the conveyed product 14 is applied vertically downward to the carrier belt 2 and the pressing force F due to the bending of the casing 8 works toward the center of the bending radial direction, the resultant force causes the rolling angle θ Roll on. The pressing force F is represented by a ratio T / R of the belt tension T and the curvature radius R of the casing 8.
[0014]
If both the carrier belt 2 and the return belt 3 have a large rolling angle θ, the belts 2 and 3 may deviate from the air supply holes 9.
As a condition for preventing such a fear, the present inventor does not need to have the rolling angle θ when the carrier belt 2 is unloaded exceed the limit value 55 °, and it is experimentally confirmed that stable operation can be performed under this condition. Revealed.
[0015]
In order to adjust the rolling angle θ, as can be seen from FIG. 1, the weight W and the pressing force F = T / R may be adjusted. However, W is determined by the weight of the belt and the conveyed product and cannot be adopted as a means for adjusting the rolling angle θ. The radius of curvature R has a limit related to the installation position of the conveyor.
[0016]
Therefore, in the present invention, to reduce the pressing force F by reducing adjusting the tension T of the endless belt 1, preferably you like rolling angle θ does not exceed the limit value 55 °. In order to reduce the tension T, means for increasing the winding angle α around the head pulley 4 and the tail pulley 5 of the endless belt 1 and means for increasing the friction coefficient μ of the pulleys 4 and 5 are adopted. it can.
[0017]
Therefore, in the present invention, as an embodiment for reducing and adjusting the tension T of the endless belt, as shown in the example of FIG. 2, the head pulley 4 and the tail pulley 5 are used as driving pulleys, and the winding angle α of both the pulleys 4 and 5 is set. Set to 210 ° to 230 °. In order to set α to 210 ° or more, the return belt 3 may be positioned upward by the bend pulley 15, thereby increasing the contact area between the pulleys 4 and 5 and the endless belt 1, and with a low tension T. Can be operated. However, if α is excessively large, the return belt 3 becomes too close to the carrier belt 2 to pass through the casing 8, and therefore the upper limit of the winding angle α is set to 230 °.
[0018]
In order to reduce and adjust the tension of the endless belt, a bridle pulley 16 is provided on the return belt 3 as shown in FIG. 3, and one or more pulleys constituting the bridle pulley 16 are used as a drive pulley 17. . In the example of FIG. 3, the bridle pulley 16 is constituted by two pulleys, and both pulleys are used as the drive pulley 17. However, either one of the pulleys may be used as the drive pulley 17.
[0019]
In addition, the bridle pulley 16 can also be composed of three pulleys as shown in FIG. 4 (a), four pulleys as shown in FIG. 4 (b), or more, one or more of them. Can also be used as the drive pulley 17. Further, a plurality of bridle pulleys 16 can be provided.
By such an aspect , the contact area of the drive pulley 17 and the endless belt 1 increases, and operation with low tension becomes possible.
[0020]
As another mode for reducing and adjusting the tension of the endless belt, the belt contact surface of the drive pulley is made of ceramic lagging. The drive pulley can be one or both of the head pulley 4 and the tail pulley 5 in the example of FIG. 2, and one or more pulleys 17 constituting the bridle pulley 16 in the examples of FIGS. be able to. Ceramic lagging can be performed by spraying or sticking ceramic to a pulley.
Since the belt contact surface of the drive pulley is made of ceramic lagging, the friction coefficient μ between the drive pulley and the endless belt 1 becomes large, and operation with low tension becomes possible.
[0021]
As described above, the above-described aspects can be performed independently or in combination. That is, the rolling angle α can be more effectively set to 55 ° or less by appropriately adopting according to installation conditions , operating conditions, and the like.
[0022]
【The invention's effect】
According to the apparatus of the present invention, even when the conveyance section is long and curved due to the installation environment, the belt does not contact the casing, so that stable operation can be performed with one conveyor, and the apparatus There is nothing complicated, and the equipment cost and operation cost are low. Therefore, the air-floating type belt conveyor that is advantageous for surrounding pollution and noise generation is lengthened, and the equipment cost and the operation cost are low, which contributes to the expansion of the use of the environment-friendly conveyor.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an apparatus of the present invention.
FIG. 2 is an explanatory view showing another example of the device of the present invention.
FIG. 3 is an explanatory diagram showing a reference example of the device of the present invention.
4A and 4B are explanatory views showing an example of a bridle pulley in a reference example of the device of the present invention. FIG.
FIG. 5 is an explanatory diagram showing an example of a conventional apparatus.
FIG. 6 is a cross-sectional view showing an example of a conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Endless belt 2 ... Carrier belt 3 ... Return belt 4 ... Head pulley 5 ... Tail pulley 6 ... Supply chute 7 ... Discharge chute 8 ... Casing 9 ... Air supply hole 10 ... Header 11 ... Branch pipe 12 ... Air supply pipe 13 ... Strut 14 ... Conveyed object 15 ... Bend pulley 16 ... Bridle pulley 17 ... Drive pulley

Claims (2)

An endless belt that is concave and curved upward in the width direction is run while being wound between a head pulley and a tail pulley, and the endless belt is used as a carrier belt on the upper side of the two pulleys and a return belt on the lower side. The carrier belt and the return belt are caused to run in a cylindrical casing at a substantially horizontal running portion between the two pulleys, and are supplied by air supplied from an air supply hole provided in one lower portion of the vertical section of the casing. In the air levitation belt conveyor to be levitated, in order to reduce and adjust the tension between the head pulley and the tail pulley of the endless belt, the head pulley and the tail pulley are used as driving pulleys, and the winding angle α of both the pulleys is 210. ° as to 230 °, the upper limit of the rolling angle θ at no load of the carrier belt and 55 ° An air levitation type long belt conveyor characterized by that. Wherein in order to reduce adjusting the tension between the head pulley and tail pulley of the endless belt, the air floating type long belt conveyor according to claim 1, wherein the belt contact surface of the drive pulley and the ceramic lagging.

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