JP2000159317A - Air floating type conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent failure or damage following the distortion of the overall length of a conveyer caused by thermal expansion, in an air floating type conveyer for blowing out air upward from an air hole provided on a trough, and giving floating force to a belt moving on the trough. SOLUTION: Elasticity of a trough and a duct plate for constituting a duct integrally provided on the lower side of the trough and for feeding air, is absorbed by first elastic parts 53. The elasticity of a conveyer frame 17 for housing the trough, a belt, and the plate is absorbed by a second elastic part 55. The second elastic part 55 divides the trough and the plate to close both the divided end parts to face them with a given distance left, and extends bypass paths 61 outside from both the divided end parts through the side surfaces 27 and 31 of the frame 17, to connect both the paths 61 by a bellows joint that is a first elastic joint 63. A rubber-made bellows 65 for covering the divided portion of the frame 17 is used as the second elastic part 55.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-floating conveyor for moving a belt carrying ore or bulk such as ore and coal while being floated by an air layer.

[0002]

2. Description of the Related Art A conventional air levitation conveyor is a belt conveyor for transporting bulk materials such as ore and coal, and a belt for carrying the bulk materials is formed by a trough made of an arc-shaped plate having a concave cross section upward. To support. Air is ejected upward from the air holes provided in the trough to form an air layer between the trough and the belt, and the belt is moved with little friction while floating with the air layer. Further, a duct for sending air is provided below the trough. These troughs, ducts and belts are housed in a conveyor frame to prevent dust.

[0003]

However, if the total length of one air-floating conveyor becomes long, expansion and contraction in the longitudinal direction (belt moving direction) due to thermal expansion, that is, thermal expansion and contraction becomes a problem. That is, the thermal expansion and contraction of the trough, the duct, and the conveyor frame may cause distortion in the air-floating conveyor, which may cause a failure or, in an extreme case, breakage.

[0004] The present invention has been made in view of such circumstances, and an object of the present invention is to provide an air-floating conveyor capable of preventing failure or damage due to thermal expansion and contraction.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to an air supply device which provides a levitation force to a belt moving on a trough by blowing air upward from an air hole provided in the trough. In the floating conveyor, the air supply duct provided integrally below the trough, and a conveyor frame having a closed cross-section and containing the trough, the duct, and the belt therein, The trough, the duct, and the conveyor frame are separated at an interval in the belt moving direction, and a closing unit that closes a divided portion of the trough and the duct, and penetrates a side surface of the conveyor frame near the divided portion to the outside. An air passage bypass formed so as to communicate with the air passage; and a bypass for absorbing expansion and contraction of the trough and the duct in a belt moving direction. A first telescopic part that connects the road, a second telescopic part that absorbs expansion and contraction in the belt movement direction of the conveyor frame provided to cover the end of the divided part, and a base part that supports the conveyor frame. And a slide means for allowing the entire conveyor to slide with the expansion and contraction.

According to the present invention, the thermal expansion and contraction generated in the trough, the belt, the duct and the like are absorbed by the first and second expansion and contraction portions. Further, since the slide caused by the expansion and contraction is allowed by the slide means, it is possible to prevent the occurrence of distortion due to the restriction of the thermal expansion and contraction, and hence, the failure and the breakage.

The first telescopic portion is provided in a bypass provided outside through a side surface of the conveyor frame near the dividing portion, and the second telescopic portion is provided at an end of the dividing portion. , And a closing means is provided at the divided portion, so that maintenance and inspection are easy and a reliable structure with few failures can be obtained.

In the sliding means, a bolt hole of a bolt for mounting the conveyor frame on a foundation is formed as an elongated hole. The sliding means is obtained with a simple configuration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An air levitation conveyor according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing one embodiment of an air-floating conveyor according to the present invention, and shows a perspective view of a telescopic part. FIG. 2 is a sectional view taken along line II-II of FIG.

In FIG. 2, a belt 5 for transporting loose materials 3 and the like is disposed on a trough 7. The trough 7 is made of a metal plate, and is provided in an upwardly concave arc shape. In the center of the trough 7 in the width direction (the direction perpendicular to the moving direction of the belt 5), an air hole for blowing air upward to form a thin air layer between the trough 7 and the belt 5 is provided. A plurality is opened along the moving direction.

Below the trough 7, a plate 9 for a duct is provided.
The duct 11 is formed as a closed space between the trough 7 and the duct plate 9 by being overlapped and closely attached to both ends in the width direction at both ends in the width direction of the trough 7. Is done.

The roller conveyor 1 is provided with a forward path 13 and a return path 15. In the upper forward path 13 and the lower return path 15 in FIG. 2, the belt 5, the trough 7, and the duct plate 9 are formed. It has almost the same configuration.

The conveyor frame 17 supports and surrounds the belt 5, the trough 7, and the duct plate 9 of the forward path 13 and the return path 15, and is closed to prevent dust and the like from the bulk 3 from leaking outside. With a cross section.

That is, the foundation leg 2 fixed to the ground 19
Legs 25 are bolted via bolted angle irons 23 passed horizontally over 1. A plurality of these legs 25 are provided in the moving direction of the belt 5, and a side panel 27 of the return path 15 is provided inside. The legs 25 are provided at both ends in the width direction with the return path 15 interposed therebetween, and a horizontal connecting member 29 is passed over the legs 25 and fixed by bolts. Side panels 3 of the outward path 13 are provided at both ends in the width direction of the horizontal connecting material 29.
1 are provided. Side panel 31 of outbound path 13
A leg 33 is provided continuously to the leg 25 of the return path 15 on the outside. A top cover 35 is attached to the upper end of the leg 33.

[0015] Then, as shown in FIGS.
3 and both ends of the side panels 27 and 31 in the return path 15 are bent outward in an L-shape.
The width direction ends 7A, 9A of the trough 7 and the plate material 9 for the duct
Are placed on top of each other. A sealing material 41 is sandwiched between the two 7A and 9A. These four (7A, 9A,
37, 41, or 7A, 9A, 39, 41) are tightened by a bolt nut 43 and are closely attached.

As shown in FIG. 3, in the outward path 13, both ends in the width direction of the top cover 35 are bent and overlapped with a portion outside the bent portion 39 of the side panel 31 via the sealing member 45. It is tightened by the bolt and nut 47 and closely adhered.

In the return path 15, as shown in FIG. 4, the lower end of the side panel 31 on the outward path 13 is bent outward and is simultaneously tightened by the bolt nut 43 via a seal member 49.

With such a configuration, both ends 9A, 7A in the width direction of the duct plate 9 and the trough 7 are in close contact with each other, so that only a space as the duct 11 is formed between the two. Instead, the inside of the conveyor frame 17 constituted by the side panels 27 and 31 and the top cover 35 can be a closed space.

The air in the closed space containing the dust generated from the conveyed bulk 3 passes through an exhaust device (not shown) communicating with the closed space and is exhausted to the outside via a filter.

The duct 11 is connected to a blower for supplying compressed air and a control valve for controlling the amount of air.

Next, the expansion and contraction section 51 will be described. As shown in FIGS. 1, 6, and 7, the air-floating conveyor 1 is provided with a telescopic portion 51 at every 100 m in the moving direction of the belt 5. The expansion and contraction portion 51 includes a first expansion and contraction portion 53 that absorbs expansion and contraction of the trough 7 and the duct plate 9, and a second expansion and contraction portion 55 that absorbs expansion and contraction of the conveyor frame 17. Two first extension portions 53 are provided, one each for the forward path 13 and the return path 15.

In the expansion / contraction section 51, the trough 7 and the duct plate 9 are separated in the belt moving direction. At both split ends (FIG. 6), the closing plate 57 is welded to the duct 11
Is closed. Both closing plates 57 are fixed at a fixed distance 59.
(FIG. 7). The fixed distance 59 is set to be larger than the expected thermal expansion and contraction of the trough 7 and the duct plate 9.

In the first expansion / contraction section 53, a pair of bypass paths 61 communicating with the duct 11 are provided in the forward path 13 and the return path 15, respectively, near the divided ends. This communication is performed by being connected to the inclined side surface of the duct plate 9. The bypass path 61 is provided at right angles to the belt moving direction and in the horizontal direction. The bypass path 61 is guided to the outside through the side panels 31 and 27 constituting the conveyor frame 17. Outside, the pair of bypass paths 61 are bent in opposite directions to face each other, and are connected via a bellows joint that is a first expansion joint 63. This opposition takes place at approximately the same distance 59 as the opposing distance 59 of the two closing plates 57. This distance should be larger than the expected thermal expansion and contraction of the conveyor frame 17.

In each of the first telescopic portions 53, the duct 11
, The cross-sectional area of the bypass 61, and the cross-sectional area of the first expansion joint 63 are kept substantially the same. That is,
A portion connected from the bypass passage 61 having a rectangular cross section to the first expansion joint 63 having a circular cross section has an inclined portion 6 connecting the square and the circle so that the cross sectional shape does not change rapidly.
4 are formed. This ensures that the delivered air has less fluid energy loss. The cross-sectional area of the bypass path 61 is different between the forward path 13 and the return path 15 because the cross-sectional area of the return path 15 is smaller because the air pressure is smaller in the return path 15.

The second expansion / contraction portion 55 is attached to the conveyor frame 17 so as to cover the trough 7 of the forward path 13 and the return path 15 and the divided end of the plate member 9 for the duct. A bellows is provided. Both ends of a frame 66 provided at both ends of the second expansion joint 65 are connected to side panels 27 and 31, which constitute the conveyor frame 17, respectively.
And is fixed to the top cover 35 by welding.
The frame 66 has a square shape on the side facing the second expansion joint 65, but has a shape along the outer shape of the conveyor frame 17 on the side facing the conveyor frame 17.
There is no gap between 7 Duct 11 to trough 7
The air blown out through the air holes of the conveyor frame 1
7, and passes through the second expansion joint 65 in a state containing dust generated from the bulk 3.

Next, the slide means will be described. As shown in FIG. 5, a bolt hole of a bolt 67 for attaching the leg 25 to the base leg 21 is a long hole 69, thereby enabling a predetermined amount of sliding in the belt moving direction due to thermal expansion and contraction. This sliding is performed by integrally forming the trough 7 of the forward path 13 and the return path 15, the plate material 9 for the duct, and the conveyor frame 17.

In the air-floating conveyor 1 having such a configuration, the trough 7 of the forward path 13 and the return path 15, the duct plate 9,
In addition, the conveyor frame 17 is substantially integrated with the bolt 43 or the like, and thermal expansion and contraction are also performed integrally. This thermal expansion and contraction is caused by the leg 2 which forms a part of the conveyor frame 17.
5 is a long hole 6 which is a bolt hole of the foundation leg 21.
Sliding at 9 is acceptable. This thermal expansion and contraction is caused by the fact that the two closing plates 57 closing the duct 11 at the divided ends and the divided ends of the conveyor frame 17 are opposed to each other via a predetermined distance. The ends and the like do not interfere and are absorbed.

At this time, the duct 1 of the forward path 13 and the return path 15
1 is supplied to the bypass passage 61 and the first expansion joint 63.
Passed between the two ends without leakage. In addition, the air containing dust in the conveyor frame 17 is passed through the second expansion joint 65 without leakage between the two divided ends.

In this way, the expansion / contraction portion 51 is allowed to slide due to the thermal expansion and contraction of the air-floating conveyor 1, the thermal expansion and contraction is absorbed, and the distortion due to the thermal expansion and contraction is restrained.
As a result, breakdown and damage can be prevented.

The first expansion / contraction portion 53 that absorbs expansion / contraction of the trough 7 and the duct plate 9 is bypassed to the outside of the conveyor frame 17 via the bypass path 61 and is connected by the first expansion joint 63. Maintenance and inspection from the outside such as the first expansion joint 63 is facilitated, and a reliable structure with less failure can be provided. At the same time, the second telescopic portion 55 can be maintained and inspected from the outside, so that the structure is also reliable.

Further, by making the bolt holes 69 elongated, a structure that can be slid with a simple structure can be obtained.
Equipment costs can be reduced.

Although the first telescopic part 53 is provided outside the conveyor frame 17, that is, outside the second telescopic part 55, the first telescopic part 53 is provided inside the second telescopic part 55. It is possible.

Although the duct plate 9 is provided integrally with the trough 7, when the duct and the trough 7 are formed separately, the duct and the trough 7 are provided with separate elastic portions. It is also possible to provide.

In the present embodiment, the trough 7, the plate member 9 for ducts, and the conveyor frame 17 are firmly fixed by bolts 43 or the like. This thermal expansion and contraction is slid by the long hole 69 of the bolt 67 of the leg 25. That is, the first telescopic part 53 and the second telescopic part 5
Although the amount of expansion and contraction in 5 is the same, a structure can be adopted in which the difference between both thermal expansion and contraction is also taken into account and this difference is absorbed.

That is, as shown in FIG. 8, the bolt hole on the side panel 31 side of the bolt 43 on the outward path 13 side is
As shown in FIG. 9, the bolt holes on the side panels 27 and 31 of the bolt 43 on the return path 15 side are formed as elongated holes 73. In this way, the trough 7, the duct plate 9, and the conveyor frame 17 independently perform thermal expansion and contraction,
The expansion and contraction of the first elastic part 53 and the second elastic part 55 can be different. Further, the expansion and contraction of the first expansion and contraction section 53 on the outward path 13 side and the first expansion and contraction section 53 on the return path 15 side can also be different. By performing independent thermal expansion and contraction in this way, distortion due to thermal expansion and contraction can be more efficiently prevented. Further, between the foundation and the conveyor frame 17, a slide base is provided on one side and a slider is provided on the other side, and the fitting state of the slide base and the slider has a cross-sectional shape for restricting movement other than sliding in the belt moving direction. Is possible.

[0036]

The air-floating conveyor of the present invention has the following effects. (1) Since the thermal expansion and contraction is absorbed by the expansion and contraction part, and the slide accompanying the expansion and contraction is allowed by the sliding means, it is possible to prevent the occurrence of distortion due to the restriction of the thermal expansion and contraction, and hence the failure and the breakage. In addition, since the first expansion / contraction portion that absorbs expansion and contraction of the trough and the duct plate is bypassed to the outside of the conveyor frame via the bypass path and connected by the first expansion joint, maintenance and inspection of the first expansion joint and the like are performed. It becomes easy, and the expansion and contraction portion can be made to have a reliable structure with little trouble.
The second telescopic part can also be maintained and inspected from the outside, so that it also has a reliable structure. (2) Sliding means can be obtained with a simple configuration by using bolt holes as long holes, and the cost of the apparatus can be suppressed.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a telescopic unit provided in an air-floating conveyor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged view of a part IIIA in FIG. 2;

FIG. 4 is an enlarged view of a part IIIB of FIG. 2;

FIG. 5 is an enlarged view of a section IIIE in FIG. 2;

FIG. 6 is a cross-sectional view taken along the line IV-IV of FIG. 1;

FIG. 7 is a front view as viewed from a direction V in FIG. 6;

FIG. 8 is a plan view of FIG. 3 in another embodiment viewed from a direction C.

FIG. 9 is a plan view of FIG. 4 in another embodiment viewed from a direction D.

[Description of Signs] 1 Air floating type conveyor 5 Belt 7 Trough 9 Plate material for duct 11 Duct 13 Outgoing path 15 Return path 17 Conveyor frame 19 Ground 21 Foundation leg 25 Leg 27, 31 Side panel 29 Horizontal connecting material 33 Leg 35 Top cover 37, 39 Bending part 41 Seal material 43 Bolt / nut 51 Elastic part 53 First elastic part 55 Second elastic part 57 Closure plate 59 Fixed distance 61 Bypass path 63 First elastic joint 65 Second elastic joint 66 Frame 67 Bolt 69 Slot 71 , 73 slot

Claims (2)

[Claims] 1. An air-floating conveyor which gives a floating force to a belt moving on the trough by blowing air upward from an air hole provided in the trough, wherein the conveyor is integrally provided below the trough. A duct for supplying air, a conveyor frame having a closed cross section and accommodating the trough, the duct, and the belt therein, wherein the trough, the duct, and the conveyor frame are spaced apart in the belt moving direction. Closing means for closing a divided portion of the trough and the duct, and a bypass passage for air passage formed so as to penetrate a side surface of the conveyor frame near the divided portion and communicate with the outside, A first telescopic part connecting the bypass to absorb the expansion and contraction of the trough and the duct in the belt movement direction, and an end of the divided part A second telescopic part provided to cover the expansion and contraction of the conveyor frame in the belt moving direction, and a slide provided on a base part supporting the conveyor frame to allow the entire conveyor to slide with the expansion and contraction. And an air levitation conveyor. 2. The air-floating conveyor according to claim 1, wherein the sliding means has a bolt hole formed into an elongated hole for mounting the conveyor frame on a foundation. Floating conveyor.