JPH09194011A - Air feeding mechanism for belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a proper amount of air regardless of the presence of an article to be conveyed and a quantity of articles to be transferred and perform constantly stable running, in a pneumatic flotation type belt conveyor. SOLUTION: An air feeding mechanism for a belt conveyor comprises a return passage conveyor belt 4 running in a curved state along the inner surface of a round tubular outer guide plate 1; and an outbound passage conveyor belt 3 running in a curved state along the inner surface of a round tubular inner guide plate 2. A blower 7 is served as a blower for floating the outbound passage conveyor belt 3 and a blower 10 is served as a blower for floating the return passage conveyor belt 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an air supply mechanism of an air levitation type belt conveyor for smoothly transporting coal, gypsum and wet ash in a thermal power plant, iron ore and auxiliary raw materials in a steel plant), and grains such as wheat, soybean, and rice.

[0002]

2. Description of the Related Art Conveyor belt itself is formed into a cylindrical shape and is conveyed as a conveyor device capable of large-scale and high-speed straight-line transportation as well as vertical and horizontal curved transportation without spillage. Is known. However, this device has a drawback in that when the conveyor belt has a cylindrical shape, the belt at the time of conveyance has its joint portion at the upper part, but the returning belt becomes downward, and the rest of the conveyed material spills.

Therefore, as an improvement of this defect,
As disclosed in Japanese Utility Model Laid-Open No. 61-65011, as shown in FIGS. 3 and 4, "an endless belt 24 that circulates between a conveyed material input portion 22 and a conveyed material discharge portion 23 by a drive mechanism 21.
And the lower surface of the conveyor 24a of the belt 24 has a trough 25
The trough 25 is provided with a required number of belt-floating gas inlets 26 at appropriate intervals in the belt running direction at the bottom of the trough 25, and a partition plate 27 is provided between the trough 25 and the return portion 24b of the belt 24. The partition plate 27, the trough 25, the left side plate 28, and the right side plate 29 form a closed space 30.
The belt 24 is covered with a cover 31 above the conveying portion 24a, a gas discharge port 32 is opened in the vicinity of the conveyed substance discharge portion 23 of the cover 31, and a cloth-made bottomed cylindrical bag 33 is provided directly above the gas discharge port 32. A plurality of dust collecting devices 34 are vertically installed, and the upper end opening of the dust collecting device 34 communicates with the intake pipe 35.
The intake pipe 35 is connected to a suction part 37 of a blower 36 for belt floatation and dust collection, and a discharge part 38 of the blower 36 is connected to a gas introduction port 26 via an air supply pipe 39 and a closed space 30. A belt conveyor "is disclosed. According to this belt conveyor, the belt transporting portion 24a having a curved shape along the inner wall of the trough 25 travels while floating by the air blown from the gas introduction port 26, and the belt return portion 24b travels along the roller 40. . That is, the forward conveyor belt (belt conveyor 2
4a) and the return conveyor belt (belt return section 24)
Since b) is externally housed in one structure,
There is an advantage in that it is possible to prevent the entry of wind and rain and the spilling of the load on the conveyed article M.

[0004]

However, the air pressure for levitation conveyance is higher than the pressure required for the dust collector, while the air amount needs to be increased in the dust collector (the inside of the conveyor is set to a negative pressure). For this reason, it is difficult to achieve the purpose of effectively collecting dust and stably supplying the air pressure required for levitation by using a single blower for both dust collection and levitation. is there. In addition, as shown in FIG. 5, when the return conveyor belt 4 is also floated, the amount of air required for levitation is increased between the forward conveyor belt 3 on the carrier side that conveys the load and the return conveyor belt 4 on the return side (only the belt). Therefore, when one (or a plurality of) blower 7 is commonly used to float the forward conveyor belt 3 and the backward conveyor belt 4, even if the flow control valve 13 is provided, the forward and backward belts are floated. It is extremely difficult to adjust the amount of air for use, and the amount of air supplied to the outward conveyor belt 3 may be insufficient, so that the belt may not be floated satisfactorily and may not be able to travel smoothly. Also, the transported object M
In the case where the conveyance amount of the above is small, the forward conveyer belt 3 causes flapping, vibration and noise due to an excessive amount of blown air.

The present invention has been made in view of the above problems of the prior art, and an object thereof is an air-floating type belt conveyor regardless of the presence or absence of conveyed articles and the amount of conveyed articles. An object of the present invention is to provide an air supply mechanism for a belt conveyor that supplies an appropriate amount of air and can always run stably.

[0006]

In order to solve the above-mentioned problems, the present invention has a forward conveyer belt floating air source and a return conveyer belt floating air source separately. Then, with such individual floating air sources, it is possible to supply a suitable amount of floating air to each of the forward conveyor belt and the backward conveyor belt.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has a cylindrical or trough-shaped guide plate and a flexible conveyor belt that travels in a curved shape along the inner surface of the guide plate. In the air supply mechanism of the belt conveyor equipped with a blower for floating the conveyor belt by supplying a pressure gas between and, it is possible to have a blower for floating the forward conveyor belt and a blower for floating the reverse conveyor belt separately. It has a feature.
In the air supply mechanism of the belt conveyor, the present invention provides an air outlet on the upper part of the guide plate, connects the air outlet to the suction part of the dust collecting blower through the dust collector, and the return conveyor belt. It is characterized in that the exhaust air of the dust collecting blower is used as an air source for floating the return conveyor belt instead of the floating blower.

Since the forward conveyor belt and the backward conveyor belt each have an individual levitation blower, the air supply mechanism of the belt conveyor configured as described above should select the blower having the optimum air volume and pressure. Therefore, it is possible to supply an appropriate amount of air according to the presence / absence of conveyed articles and the amount of conveyed articles.

Further, since the floating air pressure of the return conveyor belt which does not convey the load is generally lower than the required pressure of the dust collector, a bypass (open to the atmosphere) etc. should be provided to the exhaust of the blower set for dust collection. It is possible to provide it and to use it also.

[0010]

An embodiment will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a conveyor device to which an air supply mechanism for a belt conveyor of the present invention is applied. In the figure, 1 is an outer guide plate in the shape of a circular tube, 2 is an inner guide plate in the shape of a circular tube, 3 is a forward conveyor belt that travels in a curved shape along the inner surface of the inner guide plate 2, and 4 is an outer guide plate 1. The backward conveyor belt M, which travels in a curved shape along the inner surface of, is a conveyed product. Air discharge ports 5 and 6 are opened at predetermined intervals in the lowermost part of the guide plates 1 and 2 in the belt traveling direction (direction orthogonal to the paper surface). The discharge part 7a of the blower 7 for floating the forward conveyor belt communicates with the air discharge port 6 from the conduit 8 through the duct 9, and the discharge part 10a of the blower 10 for lifting the backward conveyor belt connects the conduit 11 and the duct 12. Through the air outlet 5. Reference numeral 13 is a flow rate adjusting valve. In the above embodiment, since the blower 7 and the blower 10 are respectively provided as the floating air sources for the carrier side conveyor belt and the return side conveyor belt, a blower having specifications (air volume and pressure) suitable for each conveyor belt is used. You can choose.

FIG. 2 is a sectional view showing another embodiment of the conveyor device to which the air supply mechanism of the belt conveyor of the present invention is applied. In the figure, an air discharge port 14 is opened at the top of the guide plates 1 and 2, and the air discharge port 14 passes through a pipe line 15 and a dust collector 16 (bug filter).
It is connected to the. The air that has passed through the dust collecting device 16 is connected to the suction portion 18a of the dust collecting blower 18 through the pipe line 17. Further, the discharge part 18b of the dust collecting blower 18
Is connected to the duct 12 via a conduit 19.

In the conveyor device having the above structure, the articles can be conveyed as follows. In the conveyor apparatus having the configuration shown in FIG. 1, when the conveyed articles M are loaded on the forward conveyor belt 3 and transferred, the blower 7 having a specification suitable for conveying articles conveys air through the duct 8 and the duct 9. The outward conveyor belt 3 is pushed up from the inner surface of the inner guide plate 2 by an appropriate amount, and can travel in a stable floating state. In this case, by appropriately adjusting the opening degree of the flow rate adjusting valve 13 arranged in the conduit 8 (similarly in the example described later), it is possible to send the air amount adapted to the fluctuation of the carry amount. In the present embodiment, the number of blowers 7 is one, but if the number of blowers is appropriately increased according to the target transport amount, it is possible to finely adjust the blown air amount.

On the other hand, the return conveyor belt 4 is pushed up by an appropriate amount from the inner surface of the outer guide plate 1 by the air fed through the blower 10, the pipe 11, and the duct 12, and can run in a stable floating state. it can.

2 uses the exhaust air of the blower 18 for the dust collector as a floating air source for the return conveyor belt 4, but the return conveyor belt 4 does not convey any articles. The air pressure for levitation is generally lower than the required pressure of the bag filter of the dust collector 16, and the amount of air may be small. Therefore, the exhaust air of the dust blower 18 discharged from the conduit 19 is directly discharged. Or even if the air is blown into the duct 12 after adjusting the air amount with the valve 13a,
The return conveyor belt 4 is pushed up by an appropriate amount from the inner surface of the outer guide plate 1 by the air discharged from the discharge port 5, and can travel in a stable floating state.

[0015]

As described above, the present invention has the following effects. According to the air supply mechanism of the belt conveyor of claim 1, the carrier side and the return side have separate blowers as the air source for floating the conveyor belt, and the blowers having the specifications suitable for the respective conveyor belts can be selected. Therefore, an appropriate amount of floating air can be supplied to each conveyor belt regardless of the presence / absence of conveyed articles and the amount of conveyed articles, so that stable traveling is always possible. According to the belt conveyor air supply mechanism of claim 2, the exhaust air of the dust collector blower is used as an air source for the return side return conveyor belt floating on the return side, which requires a relatively small discharge pressure. In addition to the effects of the invention described in 1, the cost of the belt conveyor device can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a conveyor device to which an air supply mechanism for a belt conveyor according to the present invention is applied.

FIG. 2 is a cross-sectional view showing another embodiment of a conveyor device to which an air supply mechanism for a belt conveyor of the present invention is applied.

FIG. 3 is a side sectional view of a conventional belt conveyor device.

FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG.

FIG. 5 is a cross-sectional view showing another example of a conventional belt conveyor device.

[Explanation of symbols]

 1 ... Outer guide plate 2 ... Inner guide plate 3 ... Forward conveyor belt 4 ... Return conveyor belt 7,10 ... Blower 14 ... Air discharge port 16 ... Dust collector 18 ... Dust collector blower

Claims (2)

[Claims] 1. A cylindrical or trough-shaped guide plate, and a flexible conveyor belt that travels in a curved shape along the inner surface of the guide plate, and pressure gas is provided between the guide plate and the conveyor belt. In the air supply mechanism of the belt conveyor provided with a blower for floating the conveyor belt, the forward conveyor belt floating blower and the return conveyor belt floating blower of the belt conveyor characterized by having individually Air supply mechanism. 2. The belt conveyor air supply mechanism according to claim 1, wherein an air discharge port is provided on an upper portion of the guide plate, and the air discharge port is connected to a suction part of a dust collecting blower via a dust collecting device, An air supply mechanism for a belt conveyor, characterized in that the exhaust air from the dust collecting blower is used as an air source for returning conveyor belt floating instead of the returning conveyor belt floating blower.