JP4580075B2 - Expansion and contraction structure of air levitation belt conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stretchable part structure that absorbs thermal expansion and contraction of an air levitation belt conveyor that includes a conveyor belt that is driven while being floated and held by an air layer.
[0002]
[Prior art]
In recent years, an air levitation belt conveyor that floats and holds a conveyance belt by an air layer has been proposed as a conveyance mechanism for ore and coal.
As shown in FIG. 3, the air-floating type belt conveyor is a side plate in which troughs 2 and 3 for defining the shape of the forward side of the conveyor belt 1 in a valley shape and the shape of the return side in a mountain shape are arranged on both left and right sides. 4 and 4 includes a trough frame 5 fixed to the troughs 2 and 3, and an air duct 6 is provided along the length of the trough frame on the lower side of the center of the troughs 2 and 3. A plurality of through holes 7 are opened along the line 6. An air layer is formed between the conveyor belt 1 and the troughs 2, 3 by ejecting the air supplied from the air supply blower 8 to the air duct 6 through the through holes 7 to the upper surfaces of the troughs 2, 3. The conveyor belt 1 is configured to float.
[0003]
The air-floating belt conveyor can greatly reduce the resistance acting on the transport conveyor as compared to the conventional roller-supported belt conveyor, and can eliminate noise and vibration caused by the rotation of the rollers. It is.
[0004]
This type of belt conveyor is installed as a sealed structure over a long distance, but because the trough and trough frame are made of steel, thermal expansion and contraction occurs according to the temperature. Therefore, the normal belt conveyor is provided with an expansion / contraction portion for absorbing this thermal expansion / contraction. That is, as shown in FIG. 4, the belt conveyor is provided with an expansion / contraction portion 9 in which a gap S is formed by dividing the trough 2 and the air duct 6 (and the trough frame).
[0005]
And when thermal expansion or contraction, especially thermal expansion, occurs in the trough or trough frame due to temperature fluctuations, this gap S can absorb the elongation of the trough or trough frame, so it can transport ore, coal, etc. due to thermal expansion and contraction. There will be no hindrance.
[0006]
[Problems to be solved by the invention]
However, the following problems exist in the stretchable part structure of the conventional air-floating belt conveyor as described above.
Since the air jetted between the trough 2 and the conveyor belt 1 flows out from the gap between the expansion and contraction portions 9, a predetermined air layer is not formed in the vicinity of the expansion and contraction portions 9. Therefore, there is a problem in that the conveyance belt 1 does not float normally and resistance related to conveyance increases.
[0007]
Moreover, since air cannot be supplied to the expansion / contraction part 9 as described above, there is a problem that the gap cannot be increased and the amount of heat expansion / contraction is limited. Furthermore, in the expansion / contraction part 9, it is necessary to align the troughs installed with a gap therebetween, but adjustment during assembly is difficult, and a step is generated between the troughs due to thermal expansion and contraction, resulting in belt contact. There was also a problem that the frictional resistance increased.
[0008]
The present invention has been made in consideration of the above points, and an object of the present invention is to provide a stretchable part structure of an air levitation belt conveyor capable of absorbing thermal expansion and contraction while normally lifting the conveyor belt. Another object of the present invention is to provide a stretchable structure of an air-floating belt conveyor that can easily assemble a trough that is divided and does not cause a step due to thermal expansion and contraction.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following configuration.
The telescopic structure of the air levitation belt conveyor according to claim 1 comprises a trough and a conveyor belt that floats when air is supplied between the trough, and the trough has a gap in the length direction. In the telescopic structure of the air levitation belt conveyor that is divided, one of the divided troughs is provided with a backing member that extends in the length direction and slidably supports the other of the troughs. One or the other of the divided troughs is provided with an air duct that protrudes into the gap and ejects air toward the conveyor belt .
[0010]
Therefore, in the telescopic structure of the air floating belt conveyor of the present invention, the backing member closes the gap and prevents the outflow of air, so that a predetermined air layer can be formed also in the telescopic section, and the conveyor belt is normally levitated. be able to. In addition, the other of the expanding and contracting troughs slides on the backing member and maintains the blockage with respect to the gap, so that the outflow of air due to thermal expansion and contraction can be prevented.
[0011]
The telescopic structure of the air levitation belt conveyor according to claim 2 is the telescopic structure of the air levitation belt conveyor according to claim 1, wherein one or the other of the divided troughs protrudes into the gap. An air duct that ejects air toward the conveyor belt is provided.
[0012]
Therefore, in the telescopic structure of the air levitation belt conveyor of the present invention, air can be jetted and floated also to the conveying belt on the gap between the troughs arranged in a divided manner.
[0013]
The stretchable portion structure of the air levitation belt conveyor according to claim 3 is the stretchable portion structure of the air levitation belt conveyor according to claim 2, wherein the backing member has a fitting groove along the length direction. The air duct is formed on the other side of the trough, and is fitted in the fitting groove so as to be movable in the length direction.
[0014]
Therefore, in the telescopic structure of the air floating belt conveyor of the present invention, the air duct can move relative to the backing member even when the trough expands and contracts. Moreover, when assembling the troughs to be divided, the troughs can be aligned by fitting the air duct into the fitting groove.
[0015]
The telescopic structure of the air levitation belt conveyor according to claim 4 is the telescopic structure of the air levitation belt conveyor according to claim 3, wherein the air duct is disposed in the length direction on one back surface of the trough. A second air duct is provided, which is movably fitted and ejects air toward the conveyor belt.
[0016]
Therefore, in the telescopic structure of the air floating belt conveyor of the present invention, the air duct is aligned on the back side of the trough. Therefore, the other trough is restrained from moving in the upward and leftward directions by one of the troughs via the air duct. Further, the other trough is supported by the backing member to restrain the downward movement. For this reason, the troughs are aligned at the time of assembly, and can be moved in the length direction during expansion and contraction.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a telescopic structure of an air levitation belt conveyor according to the present invention will be described with reference to FIG. 1 and FIG. In these drawings, the same components as those in FIGS. 3 and 4 shown as conventional examples are denoted by the same reference numerals, and the description thereof is omitted.
[0018]
FIG. 1 is an external perspective view in which a trough (one of the troughs) 10 and a trough (one of the troughs) 11 having substantially the same curvature are separated with a gap S in the stretchable part 9.
[0019]
A backing trough (backing member) 12 extending toward the gap S is provided on the rear surface of the trough 10, and the upper surface (inner peripheral surface) of the backing trough 12 is connected to the rear surfaces of the troughs 10 and 11. It is formed of arcs with the same curvature. Therefore, when the trough 11 is placed on the upper surface, the backing trough 12 is in surface contact with the trough 11 and supported so as to be slidable in the length direction. The extending length of the backing member 12 is set sufficiently large so as to be able to cope with the thermal expansion and contraction of the troughs 10 and 11. Moreover, the backing trough 12 is divided into two at the center in the width direction, and the length direction of the troughs 10 and 11 is provided between the fitting walls 13 and 13 that are suspended downward from each edge of the divided portion. The fitting groove 14 along is formed.
[0020]
An air duct (second air duct) 15 for supplying air to the upper surface side of the trough 10 is provided on the rear surface of the trough 10, and the gap S side end portion of the air duct 15 extends along the length direction. Are branched to extend parallel to each other. Between the branched air ducts 15, a fitting groove 16 that extends in the length direction, communicates with the fitting groove 14, and has substantially the same width is formed. A plurality of through holes 10 a are formed in the trough 10 at a predetermined pitch in accordance with the arrangement of the air ducts 15, and air that floats the conveyance belt on the trough 10 is ejected.
[0021]
On the other hand, the rear surface of the trough 11 is provided with an air duct 18 at the center in the width direction along the length direction. The trough 11 has a plurality of through holes 19 at a predetermined pitch according to the arrangement of the air duct 18. Is formed. The air duct 18 protrudes from the end edge of the trough 11 toward the gap S, and its width is set to be slightly smaller than the fitting grooves 14 and 16. Further, the protruding amount of the air duct 18 is set to be smaller than the recessed amount from the end edge of the trough 11 of the fitting groove 16, and also interferes with the air duct 15 when the air duct 18 is fitted into the fitting groove 16. It has a configuration that does not.
[0022]
As shown in FIG. 2, the upper portion of the air duct 18 protruding from the trough 11 is closed by an upper wall 20 fixed to the lower surface of the trough 11, and through holes 21 are formed on the upper wall 20 at a predetermined pitch. A plurality are formed. Therefore, the conveying belt 1 on the trough 11 is levitated by the air ejected from the through hole 19, and the conveying belt 1 on the upper wall 20 is levitated by the air ejected from the through hole 21.
[0023]
The effect | action of the expansion-contraction part structure of the air floating type belt conveyor of said structure is demonstrated below. Here, the assembly procedure of the troughs 10 and 11 will be described first.
As shown in FIG. 1, for example, the trough 11 is brought close to the trough 10 from the state where the troughs 10 and 11 are arranged substantially opposite to each other, and the tip of the air duct 18 is inserted into the fitting grooves 14 and 16. Further, the trough 11 rides on and is supported on the upper surface side of the backing trough 12.
[0024]
At this time, the movement of the air duct 18 in the width direction (left-right direction) is restricted by the air duct 15 and the fitting walls 13 and 13, and the upper wall 20 is engaged with the back surface of the trough 10 as shown in FIG. 2. This restricts the upward movement. Further, the trough 11 is supported by the backing trough 12 from below, so that the downward movement is restricted. Thereby, the trough 11 is restrained in the left-right direction and the up-down direction with respect to the trough 10, and the assembly is completed (the positions of the assembled trough 11 and the air duct 18 are indicated by a two-dot chain line in FIG. 1). .
[0025]
When thermal expansion occurs in the belt conveyor assembled in this way, the troughs 10 and 11 move in directions approaching each other, but since the gap S is formed between the troughs 10 and 11, the troughs are in contact with each other. Can absorb thermal expansion and contraction without touching. Moreover, since the amount of depression of the fitting groove 16 is larger than the amount of protrusion of the air duct 18, they do not interfere with each other.
[0026]
On the other hand, when thermal contraction occurs in the belt conveyor, the troughs 10 and 11 move away from each other, and the trough 11 slides on the backing member 12, but the trough 11 is supported by the backing trough 12. The backing member 12 and the trough 11 are maintained in contact with each other. Therefore, even if thermal expansion and contraction occurs, the lower portion of the gap S between the troughs 10 and 11 is blocked by the backing trough 12, so that air for raising the conveyor belt 1 flows out of the gap S. To prevent.
[0027]
In the stretchable part structure of the air-floating belt conveyor of the present embodiment, the backing trough 12 prevents air from flowing out from the gap S in this way, so the gap S is formed between the troughs 10 and 11 as a countermeasure against thermal expansion and contraction. Even in such a case, an air layer can be formed between the transport belt 1 and the backing trough 12 to float the transport belt 1. Therefore, it is possible to prevent inconveniences such as an increase in conveyance resistance and noise, as in the case where an air layer is not formed. Further, since the gap S can be increased by adjusting the amount of extension of the backing trough 12, there is no restriction on the amount of absorption of thermal expansion and contraction.
[0028]
In particular, in the present embodiment, the trough 11 is restrained and aligned in the left-right direction and the up-down direction with respect to the trough 10 via the air duct 18, so even when the distance between the troughs fluctuates due to thermal expansion and contraction. No step occurs between troughs, and no frictional resistance due to belt contact occurs. In addition, as described above, the air duct 18 is fitted to the fitting grooves 14 and 16 so as to be movable in the length direction, so that the troughs 10 and 11 can be easily assembled and the time required for adjustment can be reduced. Can be shortened. In addition, since the air duct 18 protruding from the trough 11 is also provided with a through hole 21 so as to eject air, the conveyor belt 1 in the gap S can be lifted reliably, increasing the conveyance resistance and reducing noise. Generation | occurrence | production can be prevented more effectively.
[0029]
Further, in the present embodiment, the air duct 15 provided in the trough 10 is formed in a U shape to form the fitting groove 16, so that as shown in FIG. Even when the through hole 21 is closed by the trough 10 and air cannot be ejected to the transport belt 1, air can be reliably supplied to the transport belt 1 on the trough 10, and an air layer can be formed.
[0030]
In the above embodiment, the trough 10 is provided with the backing trough 12 and the air duct 18 of the trough 11 is protruded. However, the present invention is not limited to this. A configuration in which the duct 15 is extended can also be employed. In this case, the lateral positions of the troughs 10 and 11 cannot be restricted, but there is an effect that the structure is simplified.
[0031]
【The invention's effect】
As described above, the telescopic structure of the air levitation belt conveyor according to claim 1 has a backing that extends in the length direction and slidably supports the other trough on one of the divided troughs. A member is provided.
As a result, in the stretchable part structure of the air levitation belt conveyor, even when a gap is formed between the troughs as a countermeasure against thermal expansion and contraction, an air layer can be formed and the conveyor belt can be levitated, so an air layer is not formed. As in the case, it is possible to prevent problems such as increased conveyance resistance and noise. Further, there is an effect that the absorption amount of thermal expansion and contraction is not limited.
[0032]
The telescopic structure of the air levitation belt conveyor according to claim 2 is configured such that one or the other of the troughs is provided with an air duct that projects into the gap and ejects air toward the conveyor belt.
Thereby, in the expansion-contraction part structure of this air floating type belt conveyor, the conveyance belt in a clearance gap can be floated reliably and the effect that the increase in conveyance resistance and generation | occurrence | production of noise can be prevented more effectively is acquired.
[0033]
The telescopic structure of the air levitation belt conveyor according to claim 3 is configured such that the air duct is fitted in a fitting groove formed in the backing member so as to be movable in the length direction.
Thereby, in the expansion-contraction part structure of this air floating type belt conveyor, the assembly of a trough can be performed easily and the effect that the time which assembly adjustment requires can be shortened is acquired.
[0034]
The telescopic structure of the air levitation belt conveyor according to claim 4 is provided with a second air duct that is fitted to one of the troughs so that the air duct is movably movable in the length direction and jets air to the conveyor belt. It has become.
As a result, in the stretchable part structure of the air-floating belt conveyor, the troughs are aligned in the left-right direction and the up-down direction. In addition to the fact that no frictional resistance occurs due to belt contact, the trough can be easily assembled and the time required for adjustment can be shortened.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention, and is an external perspective view of an expansion / contraction section provided with a backing trough between troughs.
FIG. 2 is a partial cross-sectional view in FIG.
FIG. 3 is an external perspective view showing an example of a belt conveyor.
FIG. 4 is a partial cross-sectional view showing an example of a conventional stretchable part.
[Explanation of symbols]
S gap 9 telescopic part 1 conveyor belt 10 trough (one of the troughs)
11 trough (the other trough)
12 Backing trough (backing member)
14 Fitting groove 15 Air duct (second air duct)
18 Air duct

Claims (3)

In the telescopic part structure of an air levitation belt conveyor comprising a trough and a conveyor belt that floats with air supplied between the trough, and the trough is divided and disposed with a gap in the length direction,
One of the divided troughs is provided with a backing member that extends in the length direction and slidably supports the other of the troughs ,
One or the other of the divided troughs is provided with an air duct that protrudes into the gap and ejects air toward the conveyor belt. In the stretchable part structure of the air levitation belt conveyor according to claim 1 ,
A fitting groove is formed in the backing member along the length direction,
The air duct is provided on the other side of the trough, and is fitted in the fitting groove so as to be movable in the length direction. In the stretchable part structure of the air levitation belt conveyor according to claim 2 ,
The back surface of one side of the trough is provided with a second air duct that fits the air duct movably in the length direction and jets air toward the conveyor belt. The telescopic structure of an air-floating belt conveyor.

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