JPH11263417A - Pneumatic floating belt conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unify the whole part of a carrier side including a measuring section in a pneumatic floating system. SOLUTION: In a pneumatic floating belt conveyor, air supplied from air ducts 16A and 16B on the lower surface of troughs in a carrier side is jetted upward from air holes of the troughs 12A and 12B so that a floating force is applied to a belt moving on the troughs 12A and 12B. A part of the troughs in the carrier side is set as a measuring section P. The trough 12B and the air duct 16B in the measuring section are independently cut from the troughs 12A and the air ducts 16A in the front and rear parts of a conveying direction. The independent trough is supported through load cells 6 so as to be vertically displaceable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt conveyor for transporting loose materials such as ore and coal, and more particularly to an air-floating belt conveyor that runs with a belt floated by an air layer.

[0002]

2. Description of the Related Art Conventionally, there is a belt conveyor having a structure as shown in FIG. 4 for transporting bulk materials such as ore and coal. This belt conveyor is a roller type belt conveyor, and supports a loop-shaped belt 1 wound around pulleys 2 and 3 at both ends by rollers 5 and 4 arranged on a carrier side (upper side) and a return side (lower side). While driving around. Some of the carrier-side rollers 5 are supported via load cells 6. The signal of the load cell 6 is input to the weighing calculation device 8 together with the signal of the belt speed detection roller 7, and the weighing calculation device 8 calculates and outputs the transport amount per hour (ton / hour).

On the other hand, in recent years, there has been proposed an air-floating belt conveyor in which a belt on which a bulk material is placed is supported by a trough having an arcuate cross section, and the belt runs while being floated by an air layer formed on the trough.

FIG. 5 shows an example of an air floating type belt conveyor. In this belt conveyor, a number of air holes 17 are arranged along the longitudinal direction at the center in the width direction of the troughs 12 and 13 on the carrier side and the return side that support the belt 1, and on the lower surface of each trough 12 and 13, An air duct 16 communicating with each air hole 7 is provided.
, The air is ejected upward from the air holes 17 of the troughs 12 and 13, thereby forming an air layer between the belt 1 and the troughs 12 and 13 and moving on the troughs 12 and 13. The belt 1 is made to float. The troughs 12 and 13 are fixed to a conveyor frame 14. A flow control valve 19 for controlling the amount of air blown out from the air hole 17 is provided in the middle of an air supply pipe connecting the blower 18 and the air duct 16.

[0005] With this configuration, the air levitation type belt conveyor can greatly reduce the resistance acting on the belt and can reduce the driving load as compared with the roller type belt conveyor. In addition, there is an advantage that noise and vibration can be reduced by eliminating the roller.

[0006]

However, there is also a demand for measuring the amount of conveyance in an air-floating belt conveyor. In that case, it is conceivable to apply the measuring device in the conventional roller type belt conveyor as it is.

FIGS. 6 and 7 show examples. In this example,
As shown in FIG. 6, a measuring section P is set in a part of the air levitation type belt conveyor, and the air levitation is interrupted only in the section P. Carrier side trough and air duct
Two blocks of troughs 12A, 12A sandwiching the section P
And the air ducts 16A, 16A, and between the front and rear troughs 12A, 12A, a weighing stand 9 provided with rollers 5A.
Are independently installed, and the weighing platform 9 is supported by a conveyor frame 10 via a load cell 9 as shown in FIG.

However, as described above, the roller-type measuring base 9
Is incorporated in some sections P of the air-floating belt conveyor, the device becomes less compact. In addition, trough 12A
The connection between the part received by the roller and the part received by the roller 5A is discontinuous (the belt supported by the roller has a polygonal shape, and the part received by the trough has a circular arc shape). As a result, smooth connections cannot be made and the belt may be damaged. Furthermore, since the weighing section P is not air-floating, problems such as loss of driving force and generation of noise also occur.

In the present invention, in consideration of the above circumstances, the entire carrier side including the weighing section can be unified to the air levitation system, whereby the connection can be smoothly performed and the entire apparatus can be downsized. It is another object of the present invention to provide an air-floating belt conveyor that can solve the problems of drive loss and noise generation.

[0010]

In order to solve the above-mentioned problems, an air-floating belt conveyor according to the present invention is provided with an air duct extending in a longitudinal direction of a conveyor on a lower surface of a trough on a carrier side, and the air duct is provided on the trough. The air levitation type, in which air holes communicating with the air are arranged in the longitudinal direction of the conveyor, and the air supplied from the air duct is blown upward from the air holes of the trough, thereby giving levitation force to the belt moving on the trough. In the belt conveyor, a part of the carrier-side trough is set as a weighing section, and the trough and the air duct in the weighing section are cut off from the trough and the air duct before and after the transport direction to be independent, and the independent trough is used. It is characterized by being supported vertically displaceable via a load cell. That is, since the belt is also floated by the air in the measuring section, loss of driving force and generation of noise in the measuring section are prevented. Also, since the entire carrier side is unified with the air levitation method, the connection between the weighing section and other sections is smooth, and the entire apparatus can be downsized.

[0011] Further, by providing a belt running speed detecting means and a weighing calculating means for calculating a transport amount per time based on a signal from the detecting means and a signal from the load cell, the time The per-conveyance amount can be determined.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air-floating type belt conveyor incorporating a weighing device of the embodiment, FIG. 2 is a perspective view showing a main portion of the weighing device, and FIG. 3 is a cross-sectional view showing a main portion of the weighing device. In this belt conveyor, FIGS.
As shown in (1), a part of the carrier-side trough is set as the measuring section P, and the trough 12B and the air duct 16B in the measuring section P are cut off from the trough 12A and the air duct 16A before and after the transport direction to be independent. . in this case,
The shape of the trough 12B in the measurement section P is the same as the shape of the trough 12A in the other sections.

The independent trough 12B and the air duct 16B are supported by a weighing platform 9, and the four legs of the weighing platform 9 are vertically displaced by a conveyor frame 10 via four load cells 6 as load cells. We support as much as possible. In addition, the swinging of the trough 12B before and after the trough 12B in the measurement section P is restricted by a link (not shown).

As described above, since the air duct is divided into a plurality of parts in accordance with the division of the carrier trough, the air supply pipes 20A and 20B extending from the blower 18 are connected to the respective air ducts 16A and 16B by the flow control valves 19A and 16B.
A, 19B. In this case, in particular, the air duct 16B in the measuring section P must be kept in a state in which the air duct 16B can be freely displaced up and down. Therefore, the air supply pipe 20B connected to the air duct 16B has a flexible shape that does not restrict the movement. It is preferable to use a tube or the like.

On the return side of the weighing section P, FIG.
As shown in the figure, the speed detecting roller 7 for detecting the running speed of the belt 1 is elastically moved by the link mechanism 7a or the like.
Is provided so as to be in contact with. The signal of the speed detecting roller 7 and the signal of the load cell 6 are input to the weighing calculation device 8, and the weighing calculation device 8 calculates and outputs the transport amount per time based on these signals.

Also, since the return side has nothing to do with weighing,
A trough 13 and an air duct 16 that are continuous over the entire length are provided, and the belt 1 is caused to travel with air levitation.

In the air-floating belt conveyor configured as described above, the blower 1 is attached to each of the air ducts 16, 16A and 16B while running around the belt 1.
8 supplies air from the air holes 1
7 blows onto the upper surfaces of the troughs 12 and 13 and passes between the troughs 12A, 12B and 13 and the belt 1 running thereover. Are discharged toward the air from both ends in the width direction. As a result, an air layer is formed between the belt 1 and the troughs 12A, 12B, 13 that support the belt 1, and the belt 1 is brought into a non-contact state with the troughs 12A, 12B, 13 to reduce noise and noise. The vehicle runs smoothly without generating vibration.

In the belt conveyor having the above structure, the entirety of the carrier including the measuring section P is unified with the air levitation type, so that the belt 1 travels continuously in a floating state. When the belt 1 passes through the measuring section P, the weight of the load is applied to the trough 12B via the air layer below the belt 1 and from the trough 12B to the load cell 6 via the measuring stand 9. Therefore, it is possible to detect the magnitude of the load on the belt 1 in which the load cell 6 travels in the measuring section P. This detection result is input to the weighing calculation device 8 together with the belt traveling speed, and is calculated and output as the transport amount per time.

Since the entire belt conveyor including the weighing section P is unified as an air levitation type, the apparatus is simple and compact, and noise and driving loss can be prevented. Also, the connection between the weighing section P and the sections before and after
Since it is performed on troughs 12A and 12B of similar shape,
The connection is smooth and there is no worry about damaging the belt.

In the above embodiment, the return side is an air floating type, but the return side may be a roller support type. Alternatively, the running speed of the belt may be calculated using a unit other than the belt speed detecting roller 7.

[0021]

As described above, according to the present invention,
Since the air levitation is not interrupted in the measuring section, the entire carrier side can be unified with the air levitation method. Therefore, it is possible to smoothly transfer between the weighing section and the other sections, to reduce the size of the entire apparatus, and to solve the problems of drive loss and noise generation. Further, by providing the belt traveling speed detecting means, the transport amount per time can be easily calculated based on the detection signal and the signal from the load meter.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing the entire configuration of an air-floating belt conveyor incorporating a weighing device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of the weighing device.

FIG. 3 is a sectional view of the weighing device.

FIG. 4 is an explanatory view of a conventional roller-type belt conveyor weighing device.

FIG. 5 is a cross-sectional perspective view showing an example of a conventional air levitation type belt conveyor.

FIG. 6 is a side view showing an example in which a conventional roller-type weighing device is incorporated in a part of an air-floating belt conveyor.

FIG. 7 is a sectional view of a measuring section of the belt conveyor of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Belt 6 Load cell (load meter) 7 Belt traveling speed detecting roller (traveling speed detecting means) 8 Weighing calculation device 12, 12A, 12B Trough 16, 16A, 16B Air duct 17 Air hole P Measurement section

Claims (2)

[Claims] 1. An air duct extending in a longitudinal direction of a conveyor is provided on a lower surface of a trough on a carrier side, and air holes communicating with the air duct are arranged in the trough in a row along a longitudinal direction of the conveyor and supplied from the air duct. In an air-floating belt conveyor for blowing air upward from an air hole of the trough and thereby giving a levitation force to a belt moving on the trough, a part of the carrier-side trough is set as a measuring section,
The air levitation characterized in that the trough and the air duct in the measuring section are cut off from the trough and the air duct before and after the transport direction thereof to be independent, and the independent trough is supported so as to be vertically displaceable via a load meter. Type belt conveyor. 2. A vehicle according to claim 1, further comprising a belt traveling speed detecting means, and a weighing calculating means for calculating a transport amount per time based on a signal from said detecting means and a signal from said load cell. Item 2. An air-lifting belt conveyor according to Item 1.