JP4675495B2 - Air-floating belt conveyor device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides air levitation for smoothly transporting bulk materials (such as coal, gypsum, and wet ash in thermal power plants, iron ore and secondary materials in steelworks, etc.), and grains such as wheat, soybeans, and rice. This relates to a belt conveyor.
[0002]
[Prior art]
Conventionally, an air-floating belt conveyor has a trough having a circular cross section superimposed on a trough having an arc cross section, and the trough having the circular cross section conveys a conveyed product. An air chamber for supplying compressed air to the lower part of the cross-section arc-shaped trough is provided to wrap the endless conveyor belt between the trough having the circular-section and the cross-section arc-shaped trough so that it becomes the return path after being lowered. Compressed air is supplied from the air chamber through the compressed air supply holes provided in the lower part of the trough having a circular arc cross section and the trough having a circular cross section, and the conveyed product is conveyed while the conveyor belts of the forward path part and the backward path part are floated. What to do is known.
[0003]
Further, as a method of supplying a pressure gas for causing the conveyor belt to float on air, for example, Japanese Patent Application Laid-Open No. 9-194011 filed by the present applicant discloses a cylindrical forward path guide plate, a return path guide plate, and the guide A flexible forward and return conveyor belt that travels in a curved shape along the inner surface of the plate, and includes a blower that floats the conveyor belt by supplying pressurized gas between the guide plate and the conveyor belt. In the belt conveyor air supply mechanism, an air supply mechanism for a belt conveyor is disclosed, which has a blower for floating an outward conveyor belt and a blower for floating a return conveyor belt separately.
[0004]
[Problems to be solved by the invention]
However, in the conventional method, when there is a large amount of water vapor discharged from a conveyed product or the like, the water vapor may dew and water may enter the gap between the guide plate and the conveyor belt. At this time, it is impossible to overcome the downward flow due to the weight of the moisture that has entered the gap with only the blowing force of the compressed air that lifts the conveyor belt, and moisture accumulates in the gap between the guide plate and the conveyor belt. Becomes a water film to increase the conveyance resistance.
[0005]
In the present invention, as a result of intensive studies conducted by the present inventors in order to solve the above-mentioned problems, water vapor discharged from the transported material is condensed, and a water film is generated in the gap between the guide plate and the conveyor belt. An object of the present invention is to provide an air floating belt conveyor having a mechanism for discharging condensed moisture from a gap between a guide plate and a conveyor belt as means for preventing an increase in conveyance resistance.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, in claim 1 of the present invention, a cylindrical or arcuate guide plate, a flexible conveyor belt that runs in a curved shape along the inner peripheral surface of the guide plate, and In a belt conveyor provided with a blower for floating a conveyor belt by supplying a pressure gas between a guide plate and the conveyor belt, lift air supply ports of the conveyor belt are provided on both sides of the lowest point of the guide plate. provided Rutotomoni, and an air floating belt conveyor device in which air outlet for discharging air is provided along the direction of belt travel at the lowest point of the guide plate from between the conveyor belt and the guide plate.
[0007]
Further, in claim 2, wherein the air floating belt conveyor device is provided with the guide plate corresponding to the conveyor belt and which each of the forward and return, the forward conveyor belt, the floating of the return conveyor belt or two conveyor belts provided use air supply port Rutotomoni provided on both sides of the lowest point of the corresponding guide plate, the forward conveyor belt, the air outlet of the return conveyor belt or two conveyor belts at the lowest point of the corresponding guide plate ing. In Claim 3, it is set as the air levitation type belt conveyor apparatus which attached the wind box to the said air supply port for levitation | floating.
[0008]
Further, according to a fourth aspect of the present invention, the air-floating belt conveyor device is provided with an air discharge box that covers the periphery of the air discharge port .
[0009]
In order to reduce the frictional resistance between the guide plate and the conveyor belt, the air floating type belt conveyor apparatus according to claim 5 , wherein a coating layer having a low frictional resistance is provided on the conveyor belt side surface near the lowest point of the guide plate. In the sixth aspect of the present invention, an air-floating belt conveyor device is provided in which a control valve for controlling discharged air is provided at the air discharge port.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments, and can be implemented with appropriate modifications. FIG. 1 is a sectional view showing an example of the first embodiment of the present invention. In the figure, an air levitation belt conveyor device includes a forward guide plate 11 formed in a cylindrical shape, a cylindrical return guide plate 12 containing the forward guide plate 11, and the forward guide plate 11. And a flexible endless conveyor belt that travels in a curved shape along the inner surface of the return-path-side guide plate 12.
[0011]
At the lowermost part of the guide plates 11 and 12, air discharge ports 33 are provided at predetermined intervals in the belt traveling direction. The discharge part of the forward blower 51 that floats the forward conveyor belt 21 passes through the forward duct 71 provided on both sides of the forward guide plate 11 from the forward air pipe 61 via the forward control valve 81 to the forward air supply port 41. The discharge part of the return blower 52 that floats up the return conveyor belt 22 is supplied from the return air pipe 62 via the return control valve 82 through the return duct 72 provided on both sides of the return side guide plate 12. It leads to the mouth 42. In this embodiment, since the forward blower 51 and the return blower 52 are provided as the air sources for the rising of the forward and return conveyor belts 21 and 22, respectively, the optimum specifications (air volume) for each conveyor belt 21 and 22 are provided. , Wind pressure, etc.) can be selected.
[0012]
In the belt conveyor apparatus configured as described above, goods are transported as follows.
[0013]
When the transported object M is loaded and transported on the outbound conveyor belt 21, the air sent from the outbound blower 51 having a specification suitable for article transportation through the outbound air pipe 61 and the outbound duct 71 is temporarily stored in the wind box 43. After that, by stably supplying the air amount from the outward air supply port 41, the outward conveyor belt 21 is pushed up from the outward guide plate 11 by an appropriate value, and can travel in a more stable floating state. In this case, it is possible to send an air amount corresponding to the variation in the transport amount by appropriately adjusting the opening degree of the forward path control valve 81 connected in the middle of the forward path air pipe 61.
[0014]
In the present embodiment, the outward air supply ports 41 are provided symmetrically on both sides of the outward path guide plate 11. However, the curved portion of the outward path guide plate 11 may be disposed asymmetrically. Further, in the present embodiment, one forward path blower 51 is provided, but if a plurality of forward path blowers 51 are installed according to the type of transported object or the length of the transport distance, a finer adjustment of the air amount becomes possible.
[0015]
In the return conveyor belt 22 as well, in the same manner as described above, the air sent through the return blower 52, the return air pipe 62 , and the return duct 72 is pushed up from the return guide plate 12 by an appropriate value, and in a more stable floating state. You can travel. Further, although one return path blower 52 is provided, if a plurality of return path blowers 52 are installed according to the type of transported object or the length of the transport distance, a finer adjustment of the air amount becomes possible.
[0016]
FIG. 2 is a cross-sectional view of the main part of the forward guide plate showing an example of the second embodiment of the present invention. In the figure, an outward conveyor belt 21 that travels in a curved shape with an appropriate gap H is provided along the inner peripheral surface of the outward guide plate 11. A forward air discharge port 31 is provided at the lowermost portion of the forward guide plate 11, and a forward air discharge box 91 having at least one discharge port 33 is suspended from the forward air discharge port 31. Yes. Further, an outward air supply port 41 is provided on both sides of the outward air discharge box 91 via an outward duct 71, and a wind box 43 is covered with the outward air supply port 41.
[0017]
The forward air discharge box 91 is provided at appropriate intervals along the belt traveling direction, and at least one or more discharge ports 33 are provided at the bottom. In addition, a slope 93 is formed at the bottom so that the discharge port 33 is at the bottom. As a result, the floating air sent to the forward conveyor belt 21 is temporarily stored in the wind box 43 from the forward blower 51 of the specification suitable for article conveyance, through the forward air pipe 61 and the forward duct 71, and from the forward air supply port 41. After a stable amount of air is supplied and the forward conveyor belt 21 is lifted by passing between the forward guide plate 11 and the forward conveyor belt 21, and then flows into the forward air discharge box 91, the forward air discharge box 91. The air is exhausted to the outside through a discharge port 33 provided in the lower part of the head.
[0018]
Moisture that has entered the gap H between the outward guide plate 11 and the outward conveyor belt 21 due to condensation or the like flows into the outward air discharge box 91 provided at the lowest point of the outward guide plate 11 due to gravity, and is discharged to the outlet 33. Since the liquid is discharged to the outside, an increase in conveyance resistance due to moisture is prevented. Further, by forming the slope 93 on the bottom surface of the forward air discharge box 91 with the discharge port 33 as the lowest point, it becomes possible to discharge the water without leaving the forward air discharge box 91. That is, since the outward air blowing direction is the same as the outflow direction due to the weight of water, the discharge of moisture is further promoted. The forward air discharge boxes 91 are arranged at an equal pitch in the traveling direction of the forward conveyor belt 21, but may be arranged at an unequal pitch , for example, many at locations where moisture tends to accumulate.
[0019]
In the return path conveyor belt 22 as well, moisture that has entered the gap H between the return path guide plate 12 and the return path conveyor belt 22 due to condensation is provided at the lowest point of the return path side guide plate 12 due to gravity. Since it flows into the returned return air discharge box 92 and is discharged to the outside through the discharge port 33, an increase in conveyance resistance due to moisture is prevented. Further, by forming the slope 93 with the discharge port 33 on the bottom surface of the return air discharge box 92 as the lowest point, the return air discharge box 92 can be discharged without moisture remaining.
[0020]
As the third embodiment of the present invention, in the air levitation belt conveyor device of the first embodiment shown in FIG. 1, the forward path guide plate 11 or the backward path guide plate 12, the forward path conveyor belt 21 or the backward path conveyor belt 22, A coating layer (not shown) with low frictional resistance is provided on the inner surface that may come into contact. The coating layer is adhered or coated with tetrafluoroethylene resin or the like having a low frictional resistance. The coating layer may be applied to the entire outer periphery of the conveyor belt, but may be applied to a range including at least the forward air supply port 41 or the return air supply port 42 from the lowest point at which the coating layer may come into contact with the conveyor belt. preferable. As a result, even if the conveyor belt 21.22 and the guide plates 11 and 12 come into contact with each other during traveling, the frictional resistance does not increase, thereby preventing an increase in conveyance resistance.
[0021]
FIG. 3 is a cross-sectional view of the main part of the forward guide plate showing an example of the fourth embodiment of the present invention. In the figure, an outward conveyor belt 21 that travels in a curved shape with an appropriate gap H is provided along the inner peripheral surface of the outward guide plate 11. A forward air discharge port 31 is provided at the lowermost portion of the forward guide plate 11, and a forward air discharge box 91 having at least one discharge port 33 is suspended from the forward air discharge port 31. Yes. A control valve 95 is connected to the outlet 33 of the forward air discharge box 91.
[0022]
The control valve 95 automatically closes when the water is accumulated in the forward air discharge box 91 and the conveyance resistance starts to increase, and the control valve 95 is opened by air pressure to discharge moisture together with the air, and when the conveyance resistance decreases. It becomes a state. Thereby, the pressure drop around the lowermost part of the forward path side guide plate 11 can be minimized. Note that by opening the control valve 95, the floating air pressure is lowered, and there is a possibility that the outward guide plate 11 and the outward conveyor belt 21 come into contact with each other. The time during which this contact may occur is minimized. By controlling to, more stable conveyance can be achieved and energy saving can be achieved.
[0023]
In the present embodiment, the control valve 95 is opened and closed by detecting the conveyance resistance, but can also be opened and closed by detecting the moisture content. Further, since moisture, air, and the like discharged from the control valve 95 of the outward guide plate 11 are scattered on the return conveyor belt 22, a discharge pipe that penetrates the return guide plate 12 is connected to the control valve 95. Further, moisture and air may be directly discharged to the outside. The structure and function of the return air discharge port 32 are the same as those of the forward air discharge port 31 .
[0024]
In the above embodiment, the guide plate has a double-pipe structure, but other forms of the guide plate may be, for example, separate cylindrical structures or trough-shaped curved structures, and are not limited to the above embodiments. It is not a thing.
[0025]
【The invention's effect】
An air-floating belt conveyor apparatus according to the present invention includes a cylindrical or arcuate guide plate, a flexible conveyor belt that travels in a curved shape along the inner peripheral surface of the guide plate, the guide plate, and the conveyor. the belt conveyor provided with a blower for floating the conveyor belt by supplying a pressurized gas between the belt, Rutotomoni provided levitation air supply opening of the conveyor belt on either side of the lowest point of the guide plate, wherein An air discharge port for discharging air from between the conveyor belt and the guide plate is provided along the belt traveling direction at the lowest point of the guide plate, and a wind box is attached to the floating air supply port. . Therefore, after the water vapor discharged from the transported material has condensed, the water that has entered the gap between the conveyor belt and the guide plate is discharged to the outside through the discharge port of the air discharge box at the lowest point of the guide plate. It is possible to prevent a moisture film from being generated in the gap between the conveyor belt and the guide plate, thereby increasing the conveyance resistance, and the conveyor belt can be stably driven.
[0026]
In addition, since the air floating belt conveyor device is provided with a coating layer having a low frictional resistance on the conveyor belt side surface in the vicinity of the lowest point of the guide plate, the conveyance resistance increases due to the contact between the conveyor belt and the guide plate. Since it can be made small, the conveyor belt can always run stably.
[0027]
Furthermore, since the air levitation belt conveyor device is provided with a control valve for controlling the discharged air at the air discharge port, when the moisture is generated and the frictional resistance increases, the control valve is opened to remove the moisture. It is possible to minimize the pressure drop time in the vicinity of the belt lowest point by always closing it, so that the conveyor belt can always run stably and energy saving can be achieved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of an outward path guide plate showing an example of a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of an outward path guide plate showing an example of a fourth embodiment of the present invention.
FIG. 4 is a cross-sectional view of a conventional belt conveyor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Outgoing side guide plate 12 Returning side guide plate 21 Outgoing conveyor belt 22 Outgoing conveyor belt 31 Outgoing air discharge port 32 Returning air discharge port 33 Outlet 41 Outgoing air supply port 42 Returning air supply port 43 Wind box 51 Outgoing blower 52 Returning blower 61 Outbound air piping 62 Inbound air piping 71 Outbound duct 72 Inbound duct 81 Outbound control valve 82 Inbound control valve 91 Outbound air discharge box 92 Inbound air exhaust box 93 Inclination 95 Control valve H Clearance M Conveyed material

Claims (6)

A cylindrical or arcuate guide plate, a flexible conveyor belt that travels in a curved shape along the inner peripheral surface of the guide plate, and a conveyor that supplies pressurized gas between the guide plate and the conveyor belt In a belt conveyor equipped with a blower for levitating the belt,
Lowest point of the Rutotomoni provided levitation air supply opening of the conveyor belt on either side of the lowest point of the guide plate, wherein the air discharge port for discharging air from between the conveyor belt and the guide plate guide plate An air levitation type belt conveyor device provided along the belt running direction . The air floating belt conveyor device is provided with the guide plate corresponding to the conveyor belt and which each of the forward and return, the forward conveyor belt, the corresponding floating air supply port of the return conveyor belt or two conveyor belts Rutotomoni provided on both sides of the lowest point of the guide plate, the forward conveyor belt, characterized in that the air outlet of the return conveyor belt or two conveyor belts arranged at the lowest point of the corresponding guide plate The air levitation belt conveyor apparatus according to claim 1.   The air floating belt conveyor apparatus according to claim 1, wherein a wind box is attached to the floating air supply port. The air-floating belt conveyor apparatus according to claim 3, further comprising an air discharge box that covers the periphery of the air discharge port . The air-floating belt conveyor apparatus according to any one of claims 1 to 4 , wherein a coating layer having a low frictional resistance is provided on a conveyor belt side surface near the lowest point of the guide plate. The air floating belt conveyor apparatus according to any one of claims 1 to 5, wherein a control valve for controlling discharged air is provided at the air discharge port.

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