JP2001261136A - Air levitation type belt conveyor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air levitation type belt conveyor capable of stably conveying even a conveyed object generating water vapor. SOLUTION: The conveyed object S generating the water vapor is transferred from the upstream side air levitation type belt conveyor 2 to the downstream side air levitation type belt conveyor 1 through a chute 3 and is conveyed. The periphery of a cylindrical trough 5 near the chute 3 is provided with a heat insulator 7. An exothermic body 7a is provided inside the heat insulator 7. The chute 3 and the cylindrical trough 5 near the chute 3 are provided with vapor discharge pipes 11, 10 discharging the vapor generated from the conveyed object S. An upper part inside the cylindrical trough 5 is provided with a mouseproof member 19. An upper part inside the cylindrical trough 5 is provided with a cooling line 21 through which cooling water flows.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-floating type belt conveyor device of the type which flies with compressed air.

[0002]

2. Description of the Related Art In recent years, for example, in thermal power plants,
In coal, gypsum and wet ash, and ironworks, an air-floating belt conveyor may be used as a means for transporting loose ore (hereinafter, referred to as "conveyed material") such as iron ore and auxiliary materials. This air levitation type belt conveyor has low vibration,
Because of low noise, it is useful depending on the place of use.

[0003] As such an air-floating belt conveyor, for example, there is a proposal in Japanese Patent Application Laid-Open No. 9-156739. As shown in FIG. 7, a cylindrical trough 5 having a conveyor belt 4 therein is provided, and compressed air is supplied from an air supply port 15 at a lower portion of the cylindrical trough 5 to load an object to be transported. The conveyor belt 4 is levitated.

[0004]

However, when a conveyed object (water granulation S in this example) that generates water vapor is conveyed by such an air-floating belt conveyor, as shown in FIG. Alternatively, when the temperature of the cylindrical trough 5 decreases during rainfall or the like, the water vapor condenses on the inner wall of the cylindrical trough 5 to form water droplets B and travels along the inner wall to form a contact with the inner wall of the cylindrical trough 5 and the conveyor belt. 4 gap (about 0.5mm)
D, the frictional resistance between the inner surface wall of the cylindrical trough 5 and the conveyor belt 4 increases, and the driving power of the drive pulley of the conveyor belt 4 increases significantly, resulting in a problem that stable conveyance cannot be performed. In particular, there is a tendency that a large amount occurs at the transfer section of an air-floating belt conveyor, and the cylindrical trough temperature is 2
It was remarkable at 0 ° C or lower.

[0005] Therefore, an object of the present invention is to provide an air-floating belt conveyor device that enables stable conveyance even when a conveyed object that generates steam is conveyed.

[0006]

According to a first aspect of the present invention, there is provided an air-floating belt conveyor apparatus having a cylindrical trough having a conveyor belt therein, and a compression trough supplied from the bottom of the cylindrical trough. An air levitating belt conveyor that levitates the conveyor belt with air is connected via a chute, and a conveyed object that generates steam is transferred from the upstream air levitating belt conveyor to the downstream air levitating belt conveyor through the chute. When transporting the cylindrical trough, a heat insulating material is provided on the outer periphery of the cylindrical trough.

In the air-floating belt conveyor device according to the first invention, the heat insulating material may be provided at a position near the chute of the cylindrical trough.

In accordance with a second aspect of the present invention, there is provided an air-floating belt conveyor device having a cylindrical trough having a conveyor belt therein, wherein the conveyer belt is compressed by compressed air supplied from the bottom of the cylindrical trough. The air-floating belt conveyor to be levitated is connected via a chute, and the conveyed object generating steam is transferred from the upstream air-floating belt conveyor to the downstream air-floating belt conveyor through the chute and conveyed. A heat insulating material is provided on the outer periphery of the cylindrical trough and near the chute of the cylindrical trough, and a steam vent is provided at a position near the chute and / or the chute of the cylindrical trough.

In the air-floating belt conveyor device according to the first and second aspects of the present invention, it is preferable that a heating element is provided between the heat insulating material and the cylindrical trough.

In accordance with a third aspect of the present invention, there is provided an air-floating belt conveyor device having a cylindrical trough having a conveyor belt therein, wherein the conveyer belt is compressed by compressed air supplied from the bottom of the cylindrical trough. The air-floating belt conveyor to be levitated is connected via a chute, and the conveyed object generating steam is transferred from the upstream air-floating belt conveyor to the downstream air-floating belt conveyor through the chute and conveyed. The chute and / or
Alternatively, a steam vent tube is provided at a position near the chute of the cylindrical trough.

Further, in the air-floating belt conveyor device according to the second and third aspects of the present invention, it is preferable that an exhaust fan is provided in the steam vent tube.

Further, in the air-floating belt conveyor device according to the second and third aspects of the present invention, a storage tank storing a conveyed object generating steam and a cylindrical tank are provided upstream of the upstream air-floating belt conveyor. It is preferable that a supply chute connecting the trough is provided, and a steam vent tube having an exhaust fan is provided near the supply chute.

According to a fourth aspect of the present invention, there is provided an air-floating belt conveyor device having a cylindrical trough having a conveyor belt therein, and the compressed air supplied from the bottom of the cylindrical trough to convey the conveyor belt. The air-floating belt conveyor to be levitated is connected via a chute, and the conveyed object generating steam is transferred from the upstream air-floating belt conveyor to the downstream air-floating belt conveyor through the chute and conveyed. A barbed member is provided on the inner periphery of the cylindrical trough and above both sides of the conveyor belt.

In the air-floating belt conveyor device according to a fourth aspect of the present invention, the barbed member may be provided near a chute of the cylindrical trough.

According to a fifth aspect of the present invention, there is provided an air-floating belt conveyor apparatus having a cylindrical trough having a conveyor belt therein, and the compressed air supplied from the bottom of the cylindrical trough to convey the conveyor belt. The air-floating belt conveyor to be levitated is connected via a chute, and the conveyed object generating steam is transferred from the upstream air-floating belt conveyor to the downstream air-floating belt conveyor through the chute and conveyed. A cooling pipe for circulating cooling water is provided on the inner periphery of the cylindrical trough and above the conveyor belt.

In the air-floating belt conveyor device according to a fifth aspect of the present invention, the cooling pipe may be provided near a chute of the cylindrical trough.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present inventors have shown in such an air-floating belt conveyor, for example, an air-floating belt conveyor shown in FIG. The investigation was carried out using an apparatus.

First, the configuration of the air-floating type belt conveyor device will be described. As shown in FIGS. 2, 3A and 3B, the air levitation type belt conveyor device has a downstream air levitation type belt conveyor 1 and an upstream air levitation type belt conveyor 2 which are connected to each other. A chute 3 is provided at the transfer portion. Each of the upstream and downstream air-floating belt conveyors 1 and 2 includes an upper trough 5 which is an example of a cylindrical trough having a carrier side conveyor belt (conveyor belt) 4a built therein, and a return side conveyor belt (conveyor belt). Belt) 4
Lower trough 6, which is an example of a cylindrical trough incorporating b,
A head pulley 8 and a tail pulley 9 are provided at both ends thereof at predetermined intervals above and below.

Further, an air supply port 15 provided at a lower portion of each of the upper trough 5 and the lower trough 6 to supply compressed air for floating the conveyor belt from a plurality of lower portions (bottom portions) of the upper trough 5 and the lower trough 6. An air supply pipe (not shown) connected to the air supply pipe and a blower (not shown) connected to the air supply pipe;
An exhaust tower 12 for discharging air from a plurality of upper portions of the upper trough 5 and the lower trough 6 is provided.

Further, the upstream air floating type belt conveyor 2
Is stored in a hopper, ie, a storage tank (not shown).
A supply chute 16 for feeding the conveyed object to the conveyor belt 4a of the upper trough 5 and a receiving port 17 for receiving the conveyed object flowing down through the supply chute 16 are provided to the downstream air levitation belt conveyor 1. Is provided with a receiving port 14 for receiving the conveyed object flowing down through the chute 3.

[0021] Water granulation S, which is a conveyed object that generates steam in an air-floating belt conveyor device having such a structure, is obtained by crushing molten blast furnace slag with water, and has an average particle size of 2 mm and a maximum particle size of 5 mm. (Moisture 10-15%, temperature 40-70 ° C)
When transporting the water, first, the place where the water vapor forms on the inner wall of the upper trough 5 was investigated. As a result, it was found that a large amount of dew was formed on the inner upper wall of the chute 3 and on the inner wall of the upper trough 5 near the chute 3, and almost no dew was formed on the inner wall of the central portion of the upper trough 5.

Next, as a result of investigating the cause, the surface layer of the granulated water S layered and conveyed on the conveyor belt 4a in the upper trough 5 was conveyed from the air supply port 15 below the upper trough 5. It is cooled by the belt levitation air so that no steam is generated. However, the granules S in the other portions (middle and lower layers) are not cooled but have a high temperature and generate steam. When the high-temperature granulated water S falls from the upstream air-floating belt conveyor 2 to the downstream air-floating belt conveyor 1 through the chute 3, the granulated water S in the surface layer and the granulated water in other parts are mixed. Then, on the conveyor belt 4a of the downstream air levitation belt conveyor 1, high-temperature granulation S appears on the surface layer, and furthermore, the air granulation S reaches a temperature (20 ° C. or less) at which steam is not generated in the conveyance process. Cooling.

As described above, a large amount of steam is generated while the granulated water S falls in the chute 3 and is cooled to a temperature of 20 ° C. or less on the conveyor belt 4a. The upper trough 5 of the belt conveyor 2 is cooled by the outside air, and dew condensation is generated on the steam generation location and on the inner wall surface of the upper trough 5 in the vicinity thereof.
It turned out that the range of about 00 m was remarkable.

Therefore, in order to solve the above-mentioned object, measures to prevent the occurrence of dew condensation on the inner wall of the upper trough 5 should be taken. It is sufficient to take any countermeasure that does not flow into the gap D of the inner wall of the upper trough 5, and the range may be performed over the entire length of the upper trough 5, as described above. Ie, 500 from the connection of the chute 3
It has been found that it is preferable to carry out over a range of about m.

Based on the above findings, the present inventors firstly
As a result of examining measures to prevent dew condensation on the inner wall of the upper trough 5, it was found that the apparatus shown in FIGS. 1 to 4 is effective. Hereinafter, an air levitation type belt conveyor device according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the outer circumference of the upper and lower troughs 5 of the air-floating belt conveyors 2 and 1 on the upstream side and the downstream side is located at a position 500 m from the connecting portion of the chute 3 (preferably near the chute). Edge 4 in the width direction of the conveyor belt 4a
A heat insulating material 7 such as styrene foam or asbestos is provided at least above c to prevent dew condensation occurring on the inner wall of the upper trough 5 of the upstream and downstream air-floating belt conveyors 2 and 1.

Further, in addition to the provision of the heat insulating material 7, as shown in FIG. 2, a connection portion of the chute 3 is provided above the upper trough 5 of the upstream and downstream air-floating belt conveyors 2, 1. Exhaust fan 20 that discharges steam upward at a distance of 1 m
An exhaust tower 10 (an example of a steam vent) provided inside the chute 3 and an exhaust tower 11 (an example of a steam vent) are provided above the chute 3 so that the inside of the chute 3 and the downstream air-floating belt conveyor 1 are provided. The steam generated from the granulation S in the upper trough 5 can be discharged to the outside, and the dew condensation generated on the inner wall of the upper trough 5 of the upstream and downstream air-floating belt conveyors 2 and 1 is prevented. .

As another example, FIGS. 3A and 3B
As shown in the figure, on the tail side (upstream side) of the upper trough 5 of the upstream air-floating belt conveyor 2, the vicinity of the supply chute, that is, 0.5 mm from the connection between the supply chute 16 and the upper trough 5
A steam discharge duct 18 (an example of a steam vent pipe) for discharging steam in a lateral direction is provided at a position of about 2 m. This allows
Steam generated from the granulated water S transported from the storage tank via the supply chute 16 can be discharged to the outside through the steam discharge duct 18. Also, the steam discharge duct 18
Is open at the front end (downstream side), and an exhaust fan 20 driven by a motor (not shown) is provided. By operating the exhaust fan 20, the air is efficiently supplied to the upper trough 5 ( The amount of input steam can be reduced.

Further, as shown in FIG. 4, an electric heater, a steam or hot water flow pipe or the like is provided so as to be in contact with the entire length of the upper trough 5, preferably within a distance of 500 m from the connection of the chute 3 to the outer wall of the upper trough 5. Is preferably provided between the upper trough 5 and the heat insulating material 7.

Next, as a result of examining a countermeasure to prevent the dew water B from flowing into the gap D between the conveyor belt 4a and the inner wall of the upper trough 5 even if dew condensation occurs on the inner wall of the upper trough 5, FIG.
As shown in FIG. 6, it has been found that it is effective to provide a barbed member 19 or a water cooling pipe 21 through which cooling water flows.

The barbed member 19 shown in FIG. 5 is composed of the upper trough 5 of the upstream and downstream air-floating belt conveyors 2 and 1.
It is preferable to provide the entire length above the both sides of the conveyor belt 4a on the side surface of the inner wall. However, installation work is difficult when installing on the existing air-floating belt conveyor. It may be provided up to a position of 500 m. As a result, steam from the granulated water S being condensed is condensed on the upper inner wall of the upper trough 5, and the dew water B is condensed on the upper trough 5
While flowing down the inner wall, the inflow into the gap D between the inner surface wall of the upper trough 5 and the conveyor belt 4a is blocked, and
9 is dropped on the conveyor belt 4a or the granulated S. The height H position of the inner wall above the upper trough 5 on which the rattling member 19 is provided slightly varies depending on the width of the conveyor belt 4a,
The height is preferably 0 mm. If the height is lower than 0 mm, the blowing of compressed air for floating of the conveyor belt 4 a blown from above the upper trough 5 is hindered. This is because the dew condensation is generated on the inner wall of the upper trough 5 between the upper and lower rattle members 19 and the effect is reduced.

The water-cooling pipe 21 shown in FIG. 6 is, similarly to the barbed member 19, on the inner circumference of the upper trough 5 of the upstream and downstream air-floating belt conveyors 2, 1 and above the transport belt 4a. Is preferably provided over the entire length,
When installing on the existing air-floating type belt conveyor, installation work is difficult, so it is preferable to install the chute 3 up to a position 500 m from the connection. This allows
The steam from the granulated water S being conveyed is condensed in the water cooling pipe 21 above the upper trough 5, and the condensed water B is dropped onto the granulated water S being conveyed by the conveying belt 4a. This water cooling pipe 21
The temperature of the cooling water flowing through the inside may be 20 ° C. or less and 0 ° C. or more.

[0033]

According to the first aspect of the present invention and the dependent claims 2 and 4, and the third and fourth dependent aspects of the present invention, an air-floating belt conveyor apparatus is used to form a cylindrical shape. Dew condensation does not occur on the inner wall surface of the trough. Further, with the air-floating belt conveyor device according to claims 5 and 6 and 7, the occurrence of dew condensation on the inner wall surface of the tubular trough is further reduced.
Furthermore, even if dew condensation occurs on the inner wall surface of the cylindrical trough by the air-floating belt conveyor device according to claims 8 to 11, the dew water does not flow between the cylindrical trough and the conveyor belt. Thus, it is possible to stably convey an object to be conveyed that generates steam, and the effect in this field is great.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in which a heat insulating material is provided in a cylindrical trough of an air-floating belt conveyor device according to an embodiment of the present invention.

FIG. 2 is a side view of the air-floating belt conveyor device provided with a steam vent tube.

FIGS. 3A and 3B are a plan view and a side view, respectively, in which a steam vent tube is provided on the tail side of the upstream air-floating belt conveyor of the air-floating belt conveyor device.

FIG. 4 is a cross-sectional view in which a heat insulating material and a heating element are provided on a cylindrical trough of the air-floating belt conveyor device.

FIG. 5 is a cross-sectional view in which a barbed member is provided in a cylindrical trough of the air-floating belt conveyor device.

FIG. 6 is a cross-sectional view in which a water-cooled pipe is provided in a cylindrical trough of the air-floating belt conveyor device.

FIG. 7 is a sectional view of a conventional cylindrical trough.

[Explanation of symbols]

1: Downstream air levitation belt conveyor 2: Upstream air levitation belt conveyor 3: Chute, 4a: Conveyor belt (conveyor belt), 4b: Conveyor belt (conveyor belt), 4c: Edge, 5: Upper Trough (cylindrical trough),
6: lower trough (cylindrical trough), 7: heat insulator, 7a: heating element, 8: head pulley, 9: tail pulley, 10: exhaust tower, 11: exhaust tower, 12: exhaust tower, 14: receiving port, 1
5: air supply port, 16: supply chute, 17: reception port, 1
8: steam discharge duct (steam vent), 19: rattle member,
20: exhaust fan, 21: water cooling pipe

Claims (11)

[Claims] An air-floating belt conveyer having a cylindrical trough having a conveyer belt therein and having the conveyer belt levitated by compressed air supplied from the bottom of the cylindrical trough is connected via a chute to form a steam trough. When transferring the conveyed object causing the transfer from the upstream air levitation belt conveyor to the downstream air levitation belt conveyor through the chute through the chute, a heat insulating material is provided on the outer periphery of the cylindrical trough. Levitation type belt conveyor device. 2. The air levitation belt conveyor device according to claim 1, wherein the heat insulating material is provided at a position near a chute of the cylindrical trough. 3. An air-floating belt conveyor having a cylindrical trough having a conveyer belt therein and having the conveyer belt levitated by compressed air supplied from a bottom portion of the cylindrical trough, connected via a chute, and provided with steam. When transporting the conveyed object causing the transfer from the upstream air levitating belt conveyor to the downstream air levitating belt conveyor through the chute and transporting the conveyed object, at the outer periphery of the cylindrical trough and near the chute of the cylindrical trough An air-floating belt conveyor device, wherein a heat insulating material is provided at a position, and a steam vent is provided at a position near the chute of the chute and / or the cylindrical trough. 4. An air levitation type belt conveyor device according to claim 1, wherein a heating element is provided between said heat insulating material and said cylindrical trough. Belt conveyor device. 5. An air-floating belt conveyor having a cylindrical trough having a conveyer belt therein and having a conveyer belt for floating the conveyer belt with compressed air supplied from the bottom of the cylindrical trough, via a chute. When transporting the conveyed object causing the transfer from the upstream air levitation belt conveyor to the downstream air levitation belt conveyor through the chute and transporting the conveyed object, a steam vent pipe is provided at a position near the chute of the chute and / or the cylindrical trough. An air-floating belt conveyor device comprising: 6. An air levitation belt conveyor device according to claim 3, wherein said steam vent tube is provided with an exhaust fan. 7. The air-floating belt conveyor device according to claim 3, wherein a conveyed object generating steam is stored upstream of the upstream air-floating belt conveyor. An air-floating belt conveyor device comprising: a supply chute connecting a storage tank and the cylindrical trough; and a steam exhaust pipe having an exhaust fan provided near the supply chute. 8. An air-floating belt conveyor, which has a cylindrical trough having a conveyor belt therein and which floats the conveyor belt with compressed air supplied from the bottom of the cylindrical trough, is connected via a chute to form a steam trough. When transferring the conveyed object causing the transfer from the upstream air levitating belt conveyor to the downstream air levitating belt conveyor through the chute, at the inner periphery of the cylindrical trough, and on both sides of the conveyor belt An air-floating belt conveyor device comprising a barbed member provided above. 9. An air levitation type belt conveyor device according to claim 8, wherein said barbed member is provided near a chute of said cylindrical trough. 10. An air-floating belt conveyer having a cylindrical trough having a conveyer belt inside, and an air-floating belt conveyer for floating the conveyer belt with compressed air supplied from the bottom of the cylindrical trough, connected via a chute, When transporting the conveyed object causing the transfer from the upstream air levitation belt conveyor to the downstream air levitation belt conveyor through the chute through the chute, at the inner periphery of the cylindrical trough,
And an air-floating belt conveyor device provided with a cooling pipe for circulating cooling water above the conveyor belt. 11. An air levitation belt conveyor device according to claim 10, wherein said cooling pipe is provided at a position near a chute of said cylindrical trough.