JP2006008371A - Air floating type belt conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air floating type belt conveyor capable of preventing increase frictional resistance between a belt and a carrier side trough while no load is applied on the belt, suppressing abnormal floating of the belt, and ensuring stable traveling of the belt without influence of a habit of the belt. <P>SOLUTION: The air floating type belt conveyor makes the belt 2 travel, while supplying air between a trough 14 and the belt 2 to float the belt 2. The air floating type belt conveyor has a bypass 6 which opens to a space between the belt 2 and the trough 14 in a position lower than a predetermined position at one end, and opens to the outside at the other end to release the air between the trough 14 and the belt 2 to the outside, when an ear portion 2a of the belt 2 is floated exceeding the predetermined position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a belt conveyor that conveys various loads such as ore, coal, grain, etc., and is an air levitation belt conveyor that moves an endless belt bent to a substantially semicircular arc cross section by levitating by air pressure. About.

  FIG. 8 shows a conventional air levitation belt conveyor. As shown in FIG. 8, the pneumatic belt conveyor has an endless belt 2, and the endless belt 2 is run on a carrier side trough 14 and a return side trough 15 by a driving device (not shown). For example, as shown in FIG. 9, the stack is placed on the belt 2 from the inlet on one end side of the carrier-side trough 14, and the discharge port on the other end side of the carrier-side trough 14. Lower the laminate. The endless belt 2 with the laminated material lowered to the discharge port is turned upside down around the head pulley 16, travels on the return side trough 15 in FIG. 8, turns around the tail pulley 17, and is turned up and down again. The laminate put in from the mouth is placed and travels on the carrier side trough 14. For simplicity, troughs and the like are omitted in FIG.

  FIG. 10 is a cross-sectional view of an air floating belt conveyor. In the case of an air floating belt conveyor, as shown in FIGS. 8 and 10, an air duct 18 is provided under the carrier side trough 14 and the return side trough 15 for guiding the belt 2. The carrier side trough 14 and the return side trough 15 are formed with a plurality of air supply holes 20 communicating with the inside of the air duct 18 at predetermined intervals in the longitudinal direction. Air is fed into the air duct 18 by the air supply fan 22 and is blown out from the air duct 18 through the air supply hole 20 formed in the trough, so that the space between the belt 2 and the carrier side trough 14 and the return side trough 15 Air is fed in and an air layer is formed here. Due to this air layer, the belt 2 travels while rising over the carrier-side trough 14 and the return-side trough 15.

  With the above-described configuration, the belt 2 travels while flying, so that the frictional resistance between the belt 2 and the carrier-side trough 14 and the return-side trough 15 is greatly reduced, and the driving force of the belt 2 can be reduced, and noise can be reduced. And vibration can be reduced. Such an air floating type belt conveyor is disclosed in, for example, Patent Documents 1 and 2.

JP 2002-68442 A JP2001-310810A

  However, in the air-floating belt conveyor, when the laminate is not placed on the belt 2, only the weight of the belt 2 is loaded on the belt 2, so that the air layer is thick due to the air supplied from the air supply hole 20. Thus, as shown in FIG. 11, the belt 2 may float abnormally. Usually, the air supplied to float the belt 2 is adjusted to a necessary amount at the time of load by a butterfly damper, for example. Therefore, since the belt conveyor is operated with the same air amount when loaded and unloaded, abnormal levitation is likely to occur. Conventionally, the ears 2a, which are both ends of the belt 2 in the width direction, have an angular shape, and in this abnormal levitation state, the bottom surface is pushed by the air pressure for levitation, and the shape changes so that the belt becomes flatter. As a result, the ear 2a of the belt 2 and the carrier side trough 14 come into strong contact, and the frictional resistance increases.

  In addition, since the belt 2 is turned upside down after being rotated by the head pulley 16, a wrinkle shaped so that the surface on which the conveyed product is stacked protrudes while traveling on the return side trough 15. For this reason, when the laminate is not placed after the tail pulley 17 is rotated, the belt 2 is only loaded by its own weight, so that the air layer is formed by the air supplied from the air supply hole 20 as shown in FIG. May become inflated like a balloon. In this balloon state, the ear 2a of the conventional belt 2 has an angular shape as described above, so that the ear 2a of the belt 2 and the carrier-side trough 14 come into strong contact with each other, increasing the frictional resistance. .

  Therefore, an object of the present invention is to prevent the frictional resistance between the belt and the carrier side trough from increasing in a state where no load is applied to the belt, to suppress the abnormal levitation of the belt, and to prevent the influence of belt wrinkles. An object of the present invention is to provide an air levitation type belt conveyor that can ensure a stable belt running without receiving it.

In order to achieve the above object, according to the present invention, there is provided a belt for carrying a load thereon and a trough provided under the belt for guiding and supporting the belt, and air is provided between the trough and the belt. It is an air levitation type belt conveyor that runs the belt in a state where the belt is lifted from the trough by supplying, and the ear portions which are both ends in the width direction of the belt reduce the frictional resistance when contacting the trough. An air-floating belt conveyor is provided that has a resistance-reducing shape.
According to a preferred embodiment of the present invention, the resistance-reducing shape is a shape with a chamfered corner or a round shape.

  As a result, the ear part of the belt has a chamfered shape or a round shape, so that the contact area between the ear part of the belt and the trough when the belt abnormally floats is the corner of the conventional ear part. The contact area with the trough becomes larger, and the surface pressure applied to the trough by the ear portion of the belt becomes smaller than the conventional one. Accordingly, since the surface pressure is reduced, air easily passes through the side of the ear portion from between the belt and the trough and easily escapes to the outside. As a result, since the ear portion and the trough do not come into contact with each other in a place where the air escapes, the contact area between the ear portion and the trough becomes small as a whole. In addition, a floating effect can be obtained at the belt portion where air escapes to the outside. Therefore, the frictional resistance applied to the trough is reduced as a whole. Thereby, the abnormal levitation of the belt and the balloon state can be suppressed.

  In addition, according to the present invention, the belt includes a belt that carries a load and conveys it, and a trough that is provided under the belt to guide and support the belt, and by supplying air between the trough and the belt, the belt Is an air levitation type belt conveyor that runs the belt in a state where it is levitated from the trough, and is provided on a trough in the vicinity of which the ears, which are both ends in the width direction of the belt, pass, and the belt is pushed inward to An air-floating belt conveyor is provided that has a protrusion that secures a gap between the belt and the trough in the vicinity of the ear to allow air between the belt and the belt to escape to the outside.

  As a result, even if the belt abnormally rises and the ears come into contact with the trough, this protrusion secures a gap for the air between the trough and the belt to escape to the outside. Is obtained.

  According to a preferred embodiment of the present invention, a plurality of the protrusions are provided on both sides of the trough at intervals in the longitudinal direction of the trough. As a result, the protrusion can secure a gap through which the air between the trough and the belt escapes to the outside over the entire belt, so that abnormal levitation can be suppressed and stable running of the belt can be obtained.

  Furthermore, according to the present invention, the belt has a belt for carrying a load thereon and a trough provided under the belt for guiding and supporting the belt, and by supplying air between the trough and the belt, the belt Is an air levitation type belt conveyor that runs the belt in a state where it is levitated from the trough, and one end of the trough is used to prevent the levitation position of the ears at both ends in the width direction of the belt from becoming too high. An air-floating belt conveyor characterized by having a bypass that opens to a space between a belt and a trough on an upper surface and opens the other end to the outside and allows air between the trough and the belt to escape to the outside. Provided.

  With this configuration, when the air rises higher than a predetermined position, the air between the trough and the belt escapes to the outside through the bypass, so the air between the trough and the belt can be adjusted without adjusting the air supply amount. The amount is adjusted, and a stable belt floating state is obtained.

  Furthermore, according to the present invention, the belt has a belt for carrying a load thereon and a trough provided under the belt for guiding and supporting the belt, and by supplying air between the trough and the belt, the belt Is an air levitation type belt conveyor that runs the belt in a state where it is levitated from the trough, and when the ears, which are both ends in the width direction of the belt, are abnormally levitated beyond a predetermined position, the gap between the belt and the trough An air-floating belt conveyor is provided that has exhaust holes formed in the trough so as to pass through the trough at a position lower than the predetermined position so as to allow air to escape to the outside.

  With this configuration, as described above, the air amount between the trough and the belt is adjusted without adjusting the air supply amount, and a stable belt floating state is obtained.

  According to the present invention described above, since the belt ears have a chamfered shape or a resistance-reducing shape such as a round shape, the belt and the carrier side trough can be connected even when no load is applied to the belt. The frictional resistance between them can be reduced. Further, even when the belt abnormally floats and the ears of the belt come into contact with the trough, the protrusions secure a gap for escaping the air between the trough and the belt to the outside, so that the abnormal lifting of the belt can be suppressed. Further, by providing a bypass that allows the air between the trough and the belt to escape to the outside when the belt abnormally floats, a stable belt flying state can be obtained without adjusting the air supply amount.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, common parts are denoted by the same reference numerals, and redundant description is omitted. The present invention can be applied to an air-floating belt conveyor as shown in FIG. Hereinafter, the trough 14 may mean not only the carrier-side trough 14 but also the return-side trough 15. This is because the present invention described below can be applied not only to the carrier-side configuration but also to the return-side configuration.

  FIG. 1 shows an ear 2a which is an end in the width direction of a belt 2 of an air-floating belt conveyor according to a first embodiment of the present invention. As shown in FIG. 1A, the ears 2a, which are both ends in the width direction of the belt 2, have a round shape. As described above, when no load is placed on the belt 2, since the load on the belt 2 is only the weight of the belt, air is supplied from the air supply hole 20 to the space between the trough 14 and the belt 2. As a result, the belt 2 may float abnormally as shown in FIG. Thus, when the belt 2 abnormally floats, the corners of the ears 2a of the belt 2 and the trough 14 are in strong contact with each other, so that the air between the trough 14 and the belt 2 is in a normal floating state in FIG. As indicated by the arrow A, it was difficult to escape to the outside through the side of the ear 2a, so that abnormal levitation was difficult to subside.

  However, according to the first embodiment of the present invention, since the ear 2a has a round shape, the contact area between the ear of the belt and the trough when the belt abnormally floats is the angle between the corner of the conventional ear and the trough. The contact pressure is smaller than the contact area, and the surface pressure applied to the trough 14 by the belt ear 2a is larger than the conventional one. Accordingly, the surface pressure is reduced, so that air can easily escape from between the belt 2 and the trough 14 to the outside through the side of the ear. As a result, the ear 2a and the trough 14 are not in contact with each other at the place where the air escapes, so that the contact area between the ear 2a and the trough 14 is reduced as a whole. In addition, a floating effect is obtained at the portion of the belt 2 through which air escapes to the outside. Therefore, the frictional resistance applied to the trough 14 is reduced as a whole. Thereby, abnormal levitation of the belt and the balloon state can be suppressed.

  1st Embodiment of this invention is not restricted to making the ear | edge part 2a of the belt 2 into a round shape. For example, the shape which chamfered the corner | angular part of the ear | edge part 2a of the belt 2 like FIG. 1 (B) may be sufficient. The shape of the ear | edge part 2a is not restricted above, What is necessary is just an appropriate resistance reduction shape which can suppress the balloon state of the belt 2 and can reduce the frictional resistance of the ear | edge part 2a and the trough 14 at the time of abnormal ascent.

  2 and 3 show an air levitation belt conveyor according to a second embodiment of the present invention. As shown in FIG. 2, the trough 14 is provided with a plurality of projections 4 on both sides of the trough 14 at a predetermined interval in the longitudinal direction in the vicinity of the position where the ear 2 a of the belt 2 passes. The surface of the protrusion 4 is formed smoothly so that it does not become a resistance even if the belt 2 passes over it. In addition, at the time of manufacturing the trough 14, welding for connecting in the longitudinal direction may be performed, but this welding bead may be left and used as the protrusion 4.

  The belt 2 is pushed inward by the protrusion 4, and a gap through which the air supplied between the belt 2 and the trough 14 from the air supply hole 20 can be formed outside can be formed. That is, even if the ear 2a contacts the trough when no load other than its own weight is applied to the belt 2, the above-mentioned gap is secured, and as shown by the arrows in FIGS. It is possible to escape to the outside from the space between. Accordingly, it is possible to prevent the belt 2 from abnormally floating in the no-load state, and to ensure stable running of the belt 2.

  Note that the protrusion 4 may extend so that the ear 2a of the belt 2 rides on the protrusion 4 even when the belt 2 normally floats, but when the belt 2 normally floats. The lower end of the protrusion 4 is located higher than the ear 2a of the belt 2 so that the ear 2a of the belt 2 rides on the protrusion 4 when the ear 2a of the belt 2 abnormally floats beyond a predetermined position. The protrusion 4 may extend.

  4 to 6 show an air levitation belt conveyor according to a third embodiment of the present invention. In the third embodiment, when the belt 2 abnormally floats, a bypass 6 is formed that allows air to escape from the space between the belt 2 and the trough 14. 4 indicates a path through which air escapes from the air layer through the bypass 6 to the outside when the belt 2 abnormally floats, FIG. 5 illustrates a state in which the belt 2 normally floats, and FIG. It is a perspective view which shows the air floating type belt conveyor provided with this bypass 6. FIG. As shown in FIG. 6, a plurality of bypasses 6 are provided on both sides of the trough 14 at predetermined intervals in the longitudinal direction.

  Each bypass 6 includes an exhaust hole 6 a formed on the trough 14 and a cover 6 b attached to the outer surface of the trough 14 so as to cover the exhaust hole 6 a from the outside of the trough 14.

  The position where the exhaust hole 6a is formed will be described. 5, the lower end portion of the exhaust hole 6a is located higher than the ear portion 2a of the belt 2. That is, preferably, the exhaust hole 6a is higher than the ear 2a of the belt 2 where the lower end portion normally floats and is lower than the ear 2a of the belt 2 that abnormally floats beyond a predetermined position. Is formed on the trough 14. In some cases, the lower end portion of the exhaust hole 6a is at a position lower than the ear portion 2a of the belt 2 that has abnormally floated, and the upper end portion of the exhaust hole 6a is higher than the ear portion 2a of the belt 2 that has abnormally floated. If there is, the lower end portion of the exhaust hole 6a may be at a position lower than the ear portion 2a of the belt 2 as long as the belt 2 is properly lifted in the state where the belt 2 is normally lifted. . The predetermined position is on the upper side of the trough 14, and is an appropriate position for preventing the rising position of the ear portion 2a from becoming too high.

  As described above, the cover 6 b is attached to the outer side surface of the trough 14 so as to cover the exhaust hole 6 a, thereby forming the bypass 6, and when the belt 2 abnormally floats, the cover 6 b is formed in the space between the trough 14 and the belt 2. The supplied air is exhausted to the outside as indicated by the arrows in FIGS. That is, when the ear portion 2a of the belt 2 rises beyond a predetermined position corresponding to the abnormal ascent position, one end opens into a space between the belt 2 and the trough 14 at a position lower than the predetermined position, and the other end Is opened to the outside, and a bypass 6 is formed to release the air between the trough 14 and the belt 2 to the outside.

  Accordingly, it is not necessary to control the air supply amount with a valve or the like, and air can be released to the outside from the space between the trough 14 and the belt 2 appropriately according to the floating state of the belt 2. The amount of air supplied to the space is automatically adjusted, and a stable floating state of the belt 2 can be obtained not only when the belt 2 is loaded but also when there is no load.

  The third embodiment of the present invention is not limited to the above. For example, as shown in FIG. 7, only the exhaust hole 8 is higher than the ear 2a of the belt 2 that normally floats and is lower than the ear 2a of the belt 2 that abnormally floats beyond a predetermined position. You may form so that the trough 14 may be penetrated in the position vicinity. A plurality of the exhaust holes 8 may be formed on both sides of the trough at a predetermined interval in the longitudinal direction of the trough. As a result, air can escape from the space between the abnormally levitated belt 2 and the trough 14 to the outside as indicated by the arrow in FIG. 7, and a stable levitating state of the belt 2 can be obtained. The predetermined position is on the upper side of the trough 14, and is an appropriate position for preventing the rising position of the ear portion 2a from becoming too high.

  In addition, this invention is not limited to embodiment mentioned above, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

It is a figure which shows the ear | edge part of the belt by 1st Embodiment of this invention. It is a figure which shows the air floating type belt conveyor by 2nd Embodiment of this invention. It is a figure which shows the air floating state of the belt in the air floating type belt conveyor of FIG. It is a figure which shows the flow of air when a belt abnormally floats in the air floating type belt conveyor by 3rd Embodiment of this invention. It is a figure which shows the state in which the belt has floated normally in the air levitation type belt conveyor by 3rd Embodiment of this invention. It is a perspective view which shows the air floating type belt conveyor by 3rd Embodiment of this invention. It is a figure which shows another example of the air floating type belt conveyor by 3rd Embodiment of this invention. It is a perspective view which shows the conventional air floating type belt conveyor. It is a figure which shows the conventional air floating type belt conveyor. It is a figure which shows the state in which the belt has floated normally in the conventional air levitation type belt conveyor. It is a figure which shows the state in which the belt abnormally floats in the conventional air levitation type belt conveyor. It is a figure which shows the balloon state which the air layer expanded in the conventional air levitation type belt conveyor.

Explanation of symbols

2 Belt 2a Ear part 4 Projection part 6 Bypass 6a Exhaust hole 6b Cover 8 Exhaust hole 14 Carrier side trough 15 Return side trough 16 Head pulley 17 Tail pulley 18 Air duct 20 Air supply hole 22 Air supply fan

Claims (6)

The belt has a belt that carries the load and conveys it, and a trough that is provided under the belt to guide and support the belt, and the belt is levitated from the trough by supplying air between the trough and the belt. An air levitation belt conveyor that runs the belt at
An air-floating belt conveyor characterized in that the ears, which are both ends in the width direction of the belt, have a resistance-reducing shape that reduces frictional resistance when contacting the trough.   The air-lifting belt conveyor according to claim 1, wherein the resistance-reducing shape is a shape in which a corner of the ear portion is chamfered or a round shape. The belt has a belt that carries the load and conveys it, and a trough that is provided under the belt to guide and support the belt, and the belt is levitated from the trough by supplying air between the trough and the belt. An air levitation belt conveyor that runs the belt at
It is provided on the trough near the ear that passes through the ears, which are both ends in the width direction of the belt, and the gap between the trough and the belt near the ear is pushed through the inside of the belt by pushing the belt inwards An air levitation belt conveyor having a protrusion secured between the two.   The air-lifting belt conveyor according to claim 3, wherein a plurality of the protrusions are provided on both sides of the trough at intervals in the longitudinal direction of the trough. The belt has a belt that carries the load and conveys it, and a trough that is provided under the belt to guide and support the belt, and the belt is levitated from the trough by supplying air between the trough and the belt. An air levitation belt conveyor that runs the belt at
One end opens to the space between the belt and the trough on the upper surface of the trough, and the other end opens to the outside to prevent the flying position of the ears that are both ends of the belt in the width direction from becoming too high. An air levitation belt conveyor having a bypass for escaping air between the trough and the belt to the outside. The belt has a belt that carries the load and conveys it, and a trough that is provided under the belt to guide and support the belt, and the belt is levitated from the trough by supplying air between the trough and the belt. An air levitation belt conveyor that runs the belt at
When the ears, which are both ends in the width direction of the belt, abnormally ascend beyond the predetermined position, the trough is moved near the predetermined position so as to release the air between the belt and the trough to the outside. An air levitation type belt conveyor having exhaust holes formed in a trough so as to penetrate.

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