JP3909142B2 - Air floating belt conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt conveyor that conveys loose materials such as ore and coal, and relates to an air floating belt conveyor that travels in a state where the belt is floated by an air layer.
[0002]
[Prior art]
In recent years, as a belt conveyor for transporting loose materials such as ore and coal, an air levitation type in which a belt on which loose materials are placed is supported by a trough having an arc cross section and the belt is lifted by an air layer formed on the trough. Belt conveyors have been proposed.
[0003]
3 and 4 show an example of an air floating belt conveyor. In FIG. 3, the loop belt 1 is wound around pulleys 2 and 3 at both ends and runs around. As shown in detail in FIG. 4, this belt conveyor has a large number of air holes 17 arranged in the longitudinal direction at the center in the width direction of the troughs 12 and 13 having a circular cross section on the carrier side and the return side that support the belt 1. In addition, an air duct 16 communicating with each air hole 7 is provided on the lower surface of each trough 12, 13, and air is sent from the blower 18 to the air duct 16, so that it faces upward from the air hole 17 of each trough 12, 13. The air is ejected to the belt 1 to form an air layer between the belt 1 and the troughs 12 and 13 so that the belt 1 moving on the troughs 12 and 13 is levitated. The troughs 12 and 13 are fixed to the conveyor frame 14. A flow control valve 19 for controlling the amount of air blown from the air hole 17 is interposed in the middle of the air supply pipe connecting the blower 18 and the air duct 16.
[0004]
With this configuration, the air-floating belt conveyor can greatly reduce the resistance acting on the belt, and can reduce the driving load, as compared with the roller belt conveyor. Moreover, there is an advantage that noise and vibration can be reduced by eliminating the roller.
[0005]
[Problems to be solved by the invention]
By the way, when looking at the carrier side, the load applied to the belt 1 is larger than the other general parts because the impact load due to the drop of the load acts on the loading part L that receives the load from the upstream side. However, in the above conventional air levitation belt conveyor, air is blown out from the same air duct 16 over the entire length of the conveyor as shown in FIG. In this portion, there is a problem that wear due to an increase in the contact ratio between the belt 1 and the trough 12 is likely to occur, and a driving load increases due to the increase in the contact ratio.
[0006]
In consideration of the above circumstances, the present invention provides an air levitation belt conveyor that reduces the contact ratio between a belt and a trough in a loading portion and can solve the problem of wear and the increase in driving load. With the goal.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the air floating belt conveyor of the present invention is provided with an air duct extending in the longitudinal direction of the conveyor on the lower surface of the carrier-side trough, and air holes communicating with the air duct are provided in the trough in the longitudinal direction of the conveyor. In the air levitation type belt conveyor, the air to the carrier side trough is blown out upwardly from the trough air hole, and thereby the levitation force is given to the belt moving on the trough. The duct is divided into a block corresponding to the loading part that receives the load from the upstream side and a block corresponding to the other general part, and an independent air supply pipe is connected to the air duct of each block. And
That is, in the loading unit, air having a pressure corresponding to the magnitude of the drop impact load applied to the loading unit is supplied from the air duct dedicated to the loading unit. It is possible to run while sufficiently floating, and the contact ratio between the belt and the trough can be reduced to reduce wear and drive force.
[0008]
Here, an air supply pipe extending from the air duct of the loading part is connected to a high-pressure blower, and an air supply pipe extending from the air duct of the general part is connected to a low-pressure blower. It is possible to cope with the difference in load between the loading portion and the general portion using two types of blowers. Further, an air supply pipe extending from the air duct of the loading part and an air supply pipe extending from the air duct of the general part are connected to the same blower, and the air supply pipe extends at least from the air duct of the general part. If the valve for reducing the pressure of the air flowing through is provided, the same effect as the above-described two types of valves can be obtained by using only one type of blower.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a belt conveyor according to an embodiment. In this belt conveyor, the air duct provided below the carrier side trough 12 is divided into blocks corresponding to the loading portion L that receives the load from the upstream side and blocks corresponding to other general portions, Independent air supply pipes 20A, 20B are connected to the block air ducts 16, 16A, 16B, respectively, the former air supply pipe 20A is connected to the high-pressure blower 18A via the flow control valve 19A, and the latter air supply pipe 20B. Is connected to the low pressure blower 18B through the flow control valve 19B.
[0010]
Since the return-side air duct 16 does not need to be divided, it is connected to the low-pressure blower 18B via the flow rate control valve 19C in the same manner as in the conventional example. Further, with respect to the other configurations, the portions denoted by the same reference numerals are the same as in the conventional example.
In FIG. 1, reference numeral 25 denotes a carry-in conveyor, and a cover 26 for preventing dust scattering is provided at the inlet to the air floating conveyor.
[0011]
In the air levitation belt conveyor configured as described above, air is supplied from the blower 18A to the air duct 16A and from the blower 18B to the air ducts 16 and 16B while the belt 1 is circulated. Then, the air jetted from the air holes 17 of the air ducts 16, 16A, 16B to the upper surfaces of the troughs 12, 13 passes between the troughs 12, 13 and the belt 1 traveling on the troughs 12, 13, and the troughs 12, 13 The belt 1 is guided toward both ends in the width direction of the belt 1 along the 13 curved surfaces, and discharged from the both ends in the width direction into the atmosphere. As a result, an air layer is formed between the belt 1 and the troughs 12 and 13 that support the belt 1, and the belt 1 is in a non-contact state with respect to the troughs 12 and 13 and generates noise and vibration. It will run smoothly.
[0012]
In this case, since the high pressure blower 18A is connected to the air duct 16A of the loading portion L to which the drop impact load of the load from the upstream side is applied, high pressure air can be fed from the general portion. Accordingly, the drop load can be sufficiently supported, the contact between the belt 1 and the trough 12 in the loading portion L can be reduced, and the wear of the belt 1 and the trough 12 can be reduced and the belt driving force can be reduced.
[0013]
FIG. 2 shows another embodiment of the present invention. In this air levitation type belt conveyor, an air supply pipe 20A extending from the air duct 16A of the loading section L and an air supply pipe 20B extending from the air duct 16B of the general section are connected to the same high-pressure blower 18, and The air supply pressure is lowered by a flow rate control valve 29B provided in the air supply pipe 20B. The air duct 16 on the return side is also connected to the same blower 18, and the supply pressure is lowered by the flow rate control valve 29C. Thereby, in both the general part and the loading part L, an appropriate levitation force can be given to the belt, and the same effect as in the first embodiment can be obtained.
[0014]
In the example of FIG. 2, the supply pressure for the general part is lowered by the flow rate control valves 29B and 29C, but the air hole diameter of the general part and the return side trough is narrowed down from the air hole diameter of the trough of the loading part. It is also possible to adjust the blowing air pressure to the low pressure side by increasing the air resistance by increasing the air resistance.
[0015]
【The invention's effect】
As described above, according to the air levitation belt conveyor of the present invention, the supply pressure of the air duct of the loading unit can be adjusted to a magnitude corresponding to the drop impact load. Therefore, even in the loading portion, the belt can be run while sufficiently floating above the trough, and the contact ratio between the belt and the trough can be reduced, thereby reducing wear and driving force. In this case, by using two types of blowers of high pressure and low pressure, it is possible to cope with the difference in load between the loading portion and the general portion. The air supply pipe extending from the air duct of the loading part and the air supply pipe extending from the air duct of the general part are connected to the same blower, and the air supply pipe extends at least from the air duct of the general part. If the valve for reducing the pressure of the air flowing through is provided, the same effect as the above-described two types of valves can be obtained by using only one type of blower.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of an air levitation belt conveyor according to an embodiment of the present invention.
FIG. 2 is a side view showing a schematic configuration of an air levitation belt conveyor according to another embodiment of the present invention. FIG. 3 is a side view showing a schematic configuration of a conventional air levitation belt conveyor.
FIG. 4 is a cross-sectional perspective view of a conventional air levitation belt conveyor.
[Explanation of symbols]
1 belt 12 carrier side trough 16A loading part air duct 16B general part air duct 17 air holes 20A, 20B air supply pipes 19A, 19B, 19C, 29B, 29C flow control valve

Claims (2)

An air duct extending in the conveyor longitudinal direction is provided on the lower surface of the carrier-side trough, and air holes communicating with the air duct are arranged in the trough along the conveyor longitudinal direction, so that the air supplied from the air duct is supplied to the trough air. In an air levitation belt conveyor that squirts upward from the hole, thereby giving levitation force to the belt moving on the trough,
The air duct for the carrier-side trough is divided into a block corresponding to the loading portion that receives the load from the upstream side and a block corresponding to the other general portion, and an air supply pipe that is independent of the air duct of each block. , An air supply pipe extending from the air duct of the loading section is connected to a high-pressure blower, and an air supply pipe extending from the air duct of the general section is connected to a low-pressure blower . An air duct extending in the conveyor longitudinal direction is provided on the lower surface of the carrier-side trough, and air holes communicating with the air duct are arranged in the trough along the conveyor longitudinal direction, so that the air supplied from the air duct is supplied to the trough air. In an air levitation belt conveyor that squirts upward from the hole, thereby giving levitation force to the belt moving on the trough,
The air duct for the carrier-side trough is divided into a block corresponding to the loading portion that receives the load from the upstream side and a block corresponding to the other general portion, and an air supply pipe that is independent of the air duct of each block. The air supply pipe extending from the air duct of the loading part and the air supply pipe extending from the air duct of the general part are connected to the same blower, and at least the air supply pipe extending from the air duct of the general part is connected to the air supply pipe. An air floating type belt conveyor provided with a valve for reducing the pressure of air flowing through a supply pipe .

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