WO2021215183A1

WO2021215183A1 - Classification device

Info

Publication number: WO2021215183A1
Application number: PCT/JP2021/012280
Authority: WO
Inventors: 孝昌河岸
Original assignee: 荏原環境プラント株式会社
Priority date: 2020-04-24
Filing date: 2021-03-24
Publication date: 2021-10-28
Also published as: JP2021171703A; JP7477353B2

Abstract

The present invention relates to a classification device that classifies granular substances and coarse substances according to size, and more particularly to a classification device suitable for an application of separating a fluidized medium discharged from a fluidized bed furnace and an incombustible material. The classification device includes a first rail (1) and a second rail (2) arranged side by side, and a relative movement device (5) for relatively moving the first rail (1) and the second rail (2). A first gap and a second gap larger than the first gap are formed between the first rail (1) and the second rail (2).

Description

Rating device

The present invention relates to a classification device for classifying granular substances and coarse substances according to size, and particularly to a classifying device suitable for an application of separating a fluidized medium discharged from a fluidized bed furnace and an incombustible material.

Sand is used as a fluidized bed in fluidized bed furnaces used in incinerators, pyrolysis furnaces, gasification furnaces, etc. When incombustibles (wires, stones, metals) accumulate in the furnace, poor flow occurs. Therefore, the incombustibles are extracted from the bottom of the furnace together with the sand, and the sand and incombustibles are separated by a vibrating sieve. The classification point of the vibrating sieve is about 2.5 mm to 5 mm. A vibrating sieve is an indispensable device for a fluidized bed furnace, but it has the following problems.

1. 1. Dust is generated by vibration, and harmful dust may scatter and deteriorate the working environment.
2. An expansion joint is installed to prevent vibration from being transmitted between the inlet and outlet, but this expansion joint is easily damaged by vibration, and dust may leak to the outside. Vibration-resistant expansion joints also exist, but this type is generally expensive.
3. 3. During operation, the entire vibrating sieve vibrates, so that the structure around the vibrating sieve vibrates. In order to prevent such vibration, it is necessary to increase the rigidity of the surrounding structure itself, which increases the cost.
4. Although it depends on the amount and shape of the incombustible material, it is necessary to frequently clean the net due to clogging of the vibrating sieve net, which is a burden on the operator.

As a non-vibrating sieving device, a louver type that separates sand and incombustibles by multiple inclined bars, a disc screen type that puts sand and incombustibles on these discs while rotating multiple discs that are lined up in succession, rotation There is a trommel type that separates sand and incombustibles by a drum. These types are advantageous in that they do not vibrate, but elongated objects such as wires are easily caught and also require cleaning and maintenance.

Japanese Unexamined Patent Publication No. 5-293442

Therefore, the present invention provides a maintenance-free classification device capable of achieving a small classification point without vibrating the mixture containing granules.

In one aspect, it is a classifying device for classifying granular materials and coarse materials according to their sizes, and is a relative moving device for relatively moving the first rail and the second rail arranged side by side and the first rail and the second rail. A rating device is provided in which a first gap and a second gap larger than the first gap are formed between the first rail and the second rail.

In one aspect, the relative moving device is configured to move the first rail and the second rail at different speeds.
In one aspect, the relative moving device has a first speed difference operation in which the first rail is moved faster than the second rail and a second speed difference operation in which the second rail is moved faster than the first rail. Is configured to repeat alternately.
In one aspect, the first rail and the second rail each have an inclined upper surface.

In one aspect, the relative moving device includes a first rail moving device that moves the first rail along the first circulation path and the second rail into the second circulation path independent of the first rail. It is equipped with a second rail moving device that moves along the rail.
In one aspect, the rating device further comprises a gap adjusting device that adjusts the size of the first gap.
In one aspect, the clearance adjusting device includes a first idler wheel that positions the first rail and a second idler wheel that positions the second rail.
In one aspect, the first rail and the second rail are annular, and the rating device further comprises an annular first rail and a protective plate disposed inside the second rail.

According to the present invention, since the granules are not vibrated, dust does not fly up. Further, since the first gap between the first rail and the second rail can be reduced, a classification point equivalent to that of the conventional vibrating sieve can be achieved. Further, since the object sandwiched between the first rail and the second rail is released in the second gap, a maintenance-free classification device can be realized.

It is a side view which shows one Embodiment of the classification apparatus. It is a top view of the classifier shown in FIG. It is a side view which shows the 1st rail and the 1st rail moving mechanism. It is a side view which shows the 2nd rail and the 2nd rail moving mechanism. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a top view which shows the other embodiment of the classifying apparatus. It is a side view which shows still another embodiment of the classifier. FIG. 7 is a cross-sectional view taken along the line BB of FIG. FIG. 7 is a cross-sectional view taken along the line CC of FIG. It is a side view which shows still another embodiment of the classifier. FIG. 10 is a cross-sectional view taken along the line DD of FIG. It is a side view which shows still another embodiment of the classifier. It is a side view which shows still another embodiment of the classifier.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Classifiers are used to classify granules and coarse matter according to size. Examples of granular materials and coarse materials include sand as a fluidized bed used in a fluidized bed furnace and incombustible materials contained in raw materials charged into the fluidized bed furnace. In the following description, sand and incombustibles are used as examples of granules and coarse materials, but the present invention is not limited to the following embodiments, and granules and coarse materials other than sand and incombustibles are subject to classification. You may.

FIG. 1 is a side view showing an embodiment of the classifying device, and FIG. 2 is a top view of the classifying device shown in FIG. The classifying device accommodates the first rail 1 and the second rail 2 arranged side by side, the relative moving device 5 for relatively moving the first rail 1 and the second rail 2, and the first rail 1 and the second rail 2. It includes a housing 6. The first rail 1 and the second rail 2 are arranged alternately. The number of the plurality of first rails 1 and the number of the plurality of second rails 2 are not limited to the embodiment shown in FIG. The combination of the first rail 1 and the second rail 2 is a combination of a single first rail 1 and a plurality of second rails 2, or a combination of a plurality of first rails 1 and a single second rail 2. There may be. In the embodiment shown in FIG. 2, three first rails 1 and two second rails 2 are arranged, but more first rails 1 and second rails 2 may be provided. Further, the number of the second rail 2 may be larger than the number of the first rail 1.

Each first rail 1 and each second rail 2 are endless. More specifically, the first rail 1 includes a plurality of first divided bodies 8 arranged in series, and these first divided bodies 8 are arranged in a ring shape. Similarly, the second rail 2 includes a plurality of second divided bodies 9 arranged in series, and these second divided bodies 9 are arranged in an annular shape. The first rail 1 and the second rail 2 are arranged in parallel, but a part of the second rail 2 is separated from the first rail 1. That is, a part of the second rail 2 protrudes from the first rail 1 in the longitudinal direction thereof to form an extension portion 10.

As shown in FIG. 2, the relative moving device 5 has a first rail moving device 11 that moves the first rail 1 along the first circulation path, and a second rail 2 that is independent of the first rail 1. The second rail moving device 12 for moving along the two circulation paths is provided.

FIG. 3 is a side view showing the first rail 1 and the first rail moving device 11. As shown in FIG. 3, the first rail moving device 11 includes a first endless belt 15 to which the first rail 1 is fixed, a first drive rotating body 17 supporting the first endless belt 15, and a first driven rotating body. Has 18. The plurality of first divided bodies 8 constituting the first rail 1 are fixed to the outside of the first endless belt 15. The first endless belt 15 is composed of a chain, a wire, or the like. In the present embodiment, the first endless belt 15 is an endless chain, and the first drive rotating body 17 and the first driven rotating body 18 are sprockets that support the endless chain. In one embodiment, the first endless belt 15 is an endless wire, and the first drive rotating body 17 and the first driven rotating body 18 may be pulleys that support the endless wire.

The first rail moving device 11 includes a first prime mover 19 connected to a first driving rotating body 17. The first prime mover 19 is connected to the first drive rotating body 17 via the first drive shaft 21. The first prime mover 19 is configured to rotate the first drive rotating body 17 in a predetermined direction at a predetermined speed. Specific examples of the configuration of the first prime mover 19 include an electric motor, a combination of an electric motor and an inverter, and a combination of an electric motor and a transmission gear. The first drive rotating body 17 is fixed to the first drive shaft 21, and the first drive rotating body 17 rotates integrally with the first drive shaft 21. The first drive shaft 21 is rotatably supported by a bearing (not shown). The first driven rotating body 18 is rotatably supported by the support shaft 24.

The classification device includes a plurality of first idler wheels 41 and a plurality of first wheel holders 42 as a first positioning mechanism for positioning the upper portion of the first rail 1. Each first idler wheel 41 is configured to be rotatable about its axis. These first idler wheels 41 are arranged on the back side (inside) of the first rail 1 and roll into contact with the first endless belt 15. The upper part of the first rail 1 and the upper part of the first endless belt 15 are supported by a plurality of first idler wheels 41. In one embodiment, the first idler wheel 41 may roll and contact the upper part of the first rail 1 to directly support the first rail 1. The first idler wheel 41 is arranged between the first drive rotating body 17 and the first driven rotating body 18, and the first rail 1 is supported from below by the first idler wheel 41.

The first idler wheel 41 is rotatably held by the first wheel holder 42. The vertical position of the first idler wheel 41 can be adjusted. Specifically, the vertical position of the first idler wheel 41 relative to the first wheel holder 42 is variable. For example, the first wheel holder 42 has a bearing that rotatably supports the first idler wheel 41 and a push bolt that adjusts the vertical position of the bearing. When the first idler wheel 41 is raised, the upper part of the first rail 1 is raised, and when the first idler wheel 41 is lowered, the upper part of the first rail 1 is lowered due to its gravity.

FIG. 4 is a side view showing the second rail 2 and the second rail moving device 12. As shown in FIG. 4, the second rail moving device 12 includes a second endless belt 25 to which the second rail 2 is fixed, a second drive rotating body 27 supporting the second endless belt 25, and a second driven rotating body. Has 28. The plurality of second divided bodies 9 constituting the second rail 2 are fixed to the outside of the second endless belt 25. The second endless belt 25 is composed of a chain, a wire, or the like. In the present embodiment, the second endless belt 25 is an endless chain, and the second drive rotating body 27 and the second driven rotating body 28 are sprockets that support the endless chain. In one embodiment, the second endless belt 25 may be an endless wire, and the second drive rotating body 27 and the second driven rotating body 28 may be pulleys that support the endless wire.

The second rail moving device 12 includes a second prime mover 29 connected to the second drive rotating body 27. The second prime mover 29 is connected to the second drive rotating body 27 via the second drive shaft 31. The second prime mover 29 is configured to rotate the second drive rotating body 27 in a predetermined direction at a predetermined speed. Specific examples of the configuration of the second prime mover 29 include an electric motor, a combination of an electric motor and an inverter, and a combination of an electric motor and a transmission gear. The second drive rotating body 27 is fixed to the second drive shaft 31, and the second drive rotating body 27 rotates integrally with the second drive shaft 31. The second drive shaft 31 is rotatably supported by a bearing (not shown). The second driven rotating body 28 is rotatably supported by the support shaft 24.

The second drive shaft 31 is arranged at a position away from the first drive shaft 21, whereby the extension portion 10 of the second rail 2 moves away from the first rail 1. In the present embodiment, the first driven rotating body 18 and the second driven rotating body 28 are rotatably supported by a common support shaft 24, but in one embodiment, the first driven rotating body 18 and the second driven rotating body 18 are rotatably supported. The rotating body 28 may be rotatably supported by separate support shafts.

The classification device includes a plurality of second idler wheels 51 and a plurality of second wheel holders 52 as a second positioning mechanism for positioning the upper portion of the second rail 2. Each second idler wheel 51 is configured to be rotatable about its axis. These second idler wheels 51 are arranged on the back side (inside) of the second rail 2 and roll into contact with the second endless belt 25. The upper part of the second rail 2 and the upper part of the second endless belt 25 are supported by a plurality of second idler wheels 51. In one embodiment, the second idler wheel 51 may roll into contact with the upper portion of the second rail 2 to directly support the second rail 2. The second idler wheel 51 is arranged between the second drive rotating body 27 and the second driven rotating body 28, and the second rail 2 is supported from below by the second idler wheel 51.

The second idler wheel 51 is rotatably held by the second wheel holder 52. The vertical position of the second idler wheel 51 is adjustable. Specifically, the vertical position of the second idler wheel 51 relative to the second wheel holder 52 is variable. For example, the second wheel holder 52 has a bearing that rotatably supports the second idler wheel 51 and a push bolt that adjusts the vertical position of the bearing. When the second idler wheel 51 is raised, the upper portion of the second rail 2 is raised, and when the second idler wheel 51 is lowered, the upper portion of the second rail 2 is lowered due to its gravity.

As shown in FIG. 1, the housing 6 has an input port 60 at its upper portion. The mixture containing sand and incombustibles is charged from above onto the upper parts of the first rail 1 and the second rail 2 through the input port 60. As shown in FIG. 1, in the housing 6, there is a classification zone for separating sand and incombustibles in the mixture, and a release zone for releasing incombustibles. The release zone is located downstream of the classification zone in the moving direction of the first rail 1 and the second rail 2. The first rail 1 and the second rail 2 move (circulate) in the same direction at different speeds by the first rail moving device 11 and the second rail moving device 12. The first rail 1 and the second rail 2 move relatively while circulating along the first circulation path and the second circulation path, respectively.

As shown in FIG. 1, the rating device has a hopper 63 and a chute 65 located below the first rail 1 and the second rail 2. The hopper 63 is located below the inlet 60 and the classification zone, and the chute 65 is located below the extension 10 and the release zone of the second rail 2. The hopper 63 has an opening 63a for discharging sand (granular matter). The chute 65 is a discharge port for incombustible materials (oversized materials).

A partition plate 68 is arranged between the hopper 63 and the chute 65. The partition plate 68 projects upward from the boundary between the hopper 63 and the chute 65. The partition plate 68 prevents sand that has fallen from the first rail 1 and the second rail 2 from entering the chute 65, and incombustible material that has fallen from the first rail 1 and the second rail 2 enters the hopper 63. It is provided to prevent. The horizontal position and angle of the partition plate 68 may be adjustable.

In the hopper 63, a scraping screw 70 that scrapes sand (granular matter) that has fallen from the first rail 1 and the second rail 2 is arranged. The scraping screw 70 is connected to the screw motor 71 and is rotated by the screw motor 71. The sand in the hopper 63 is scraped toward the opening 63a of the hopper 63 by the rotating scraping screw 70.

FIG. 5 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 5, the first rail 1 and the second rail 2 have inclined

upper surfaces

1a and 2a, respectively. In the present embodiment, the first rail 1 and the second rail 2 have tapered

upper surfaces

1a and 2a and have a triangular cross section. In one embodiment, the first rail 1 and the second rail 2 have a semicircular or circular cross section, provided that the sand (granular matter) contained in the mixture can be moved downward by its own weight. You may.

As shown in FIG. 5, the second rail 2 is located above the upper surface 1a of the first rail 1, and the second rail 2 is not in contact with the upper surface 1a of the first rail 1. Therefore, a first gap is formed between the first rail 1 and the second rail 2. This first gap is, for example, in the range of 1 mm to 5 mm. The size of this gap can be adjusted by the vertical position of the first idler wheel 41 and / or the second idler wheel 51. For example, when the first idler wheel 41 is lowered and / or the second idler wheel 51 is raised, the first gap becomes large.

Since the second rail 2 is located above the upper surface 1a of the first rail 1, as shown in FIG. 2, the second rail 2 appears to overlap the first rail 1 when viewed from above. Actually, as shown in FIG. 5, the second rail 2 is not in contact with the first rail 1.

The first idler wheel 41, the first wheel holder 42, the second idler wheel 51, and the second wheel holder 52 adjust the size of the first gap between the first rail 1 and the second rail 2. Configure the gap adjustment device.

Instead of the plurality of first idler wheels 41 and the plurality of second idler wheels 51, it is conceivable to position the first rail 1 and the second rail 2 with a non-rotating support member, but the non-rotating support member is the first. The sliding contact between the endless belt 15 and the second endless belt 25 may cause wear, and as a result, the positions of the first rail 1 and the second rail 2 may be lowered. On the other hand, the plurality of first idler wheels 41 and the plurality of second idler wheels 51 roll into contact with the first endless belt 15 and the second endless belt 25 (or the first rail 1 and the second rail 2). Hard to wear. From this point of view, the clearance adjusting device includes the first idler wheel 41 and the second idler wheel 51 described above.

Next, the operation of the classification device will be described. The first rail 1 and the second rail 2 are moved by the first rail moving device 11 and the second rail moving device 12 in the same direction and at different speeds. The moving speed of the first rail 1 may be higher or lower than the moving speed of the second rail 2. The mixture containing sand and incombustibles is charged onto the upper parts of the first rail 1 and the second rail 2 through the input port 60.

As shown in FIG. 1, there is a classification zone in which the mixture is charged and a release zone on the downstream side of the classification zone. The input port 60 is in the classification zone. In the classification zone, as the first rail 1 and the second rail 2 move relative to each other, the sand in the mixture moves downward with agitation and passes through the first gap between the first rail 1 and the second rail 2. And fall. On the other hand, the incombustible material (coarse material) in the mixture is larger than sand and cannot pass through the first gap between the first rail 1 and the second rail 2. Therefore, in the classification zone, the sand (granular material) in the mixture falls from the first rail 1 and the second rail 2, while the incombustibles are carried to the release zone by the first rail 1 and the second rail 2. ..

In the release zone, the 2nd rail 2 is separated from the 1st rail 1. Therefore, a second gap larger than the first gap in the classification zone is formed between the first rail 1 and the second rail 2 in the release zone. The incombustible material falls from the first rail 1 and the second rail 2 through the second gap. An incombustible material larger than the second gap falls from the second rail 2 when the second rail 2 moves downward. In this way, sand and incombustibles are separated.

The sand that has fallen from the first rail 1 and the second rail 2 is received by the hopper 63. The sand in the hopper 63 is scraped into the opening 63a by the scraping screw 70, and is discharged from the rating device through the opening 63a. The incombustible material is discharged from the rating system through the chute 65.

The first gap in the classification zone is determined based on the size of the sand (ie, granules) contained in the mixture. If the first gap is too small, sand cannot pass through the gap. On the other hand, if the first gap is too large, incombustibles will fall through the first gap together with sand. Therefore, the first gap is within a predetermined range based on the size of the granules contained in the mixture. On the other hand, the second gap is larger than the upper limit of the predetermined range of the first gap. When the granules contained in the mixture are sand as a flow medium, the first gap between the first rail 1 and the second rail 2 in the classification zone is in the range of 1 mm to 5 mm. If the first gap is made small, a classification point equivalent to that of a vibrating sieve can be achieved.

The second gap between the first rail 1 and the second rail 2 in the release zone is larger than the first gap in the classification zone. In the release zone, not only the incombustible material falls from the first rail 1 and the second rail 2, but also the sand or the incombustible material sandwiched between the first rail 1 and the second rail 2 is released. For example, an elongated incombustible material such as a wire is likely to be caught between the first rail 1 and the second rail 2 in the classification zone. Such an elongated incombustible material falls from the first rail 1 and the second rail 2 in the release zone where a large second gap is formed. Therefore, the rating device of the present embodiment does not require substantially maintenance.

According to this embodiment, since the granules are not vibrated, dust does not fly up. Further, since the first gap between the first rail 1 and the second rail 2 can be made small, a classification point equivalent to that of the conventional vibrating sieve can be achieved. Further, since the object sandwiched between the first rail 1 and the second rail 2 is released in the second gap, a maintenance-free classification device can be realized.

In the classification zone, the sand in the mixture is agitated by the relative movement of the first rail 1 and the second rail 2, and falls through the first gap between the first rail 1 and the second rail 2. The mode in which the first rail 1 and the second rail 2 move relative to each other is not limited to this embodiment. If the speed difference between the first rail 1 and the second rail 2 is fixed during the operation of the classifier, a long object such as a nail rotates in the same direction due to the speed difference and is parallel to the first gap. It may fall through the first gap. Therefore, in one embodiment, the relative moving device 5 moves the first rail 1 faster than the second rail 2 in the first speed difference operation and the second rail 2 moves faster than the first rail 1. The speed difference operation may be repeated alternately. For example, the speeds of the first rail 1 and the second rail 2 may be alternated.

In one embodiment, the first rail 1 and the second rail 2 may move intermittently. More specifically, the first rail 1 and the second rail 2 may alternately move in one direction. For example, even if the first rail 1 moves when the second rail 2 is stopped, the second rail 2 moves when the first rail 1 is stopped, and such intermittent movement is repeated. good. The speeds of the first rail 1 and the second rail 2 when moving intermittently may be the same or different.

In one embodiment, the first rail 1 and the second rail 2 may move in different directions. For example, in FIG. 1, the first rail 1 may move counterclockwise at a first speed, and the second rail 2 may move clockwise at a second speed higher than the first speed. .. Further, in one embodiment, the relative moving device 5 moves the first rail 1 and the second rail 2 in the same direction at different speeds in the same direction, and moves the first rail 1 and the second rail 2 in different directions. The different direction moving operation of moving at different speeds may be alternately repeated.

The various modes in which the first rail 1 and the second rail 2 move relative to each other as described above are achieved by the operation of the relative moving device 5. The various aspects of relative movement described above may be combined as appropriate. For example, one of the first rail 1 and the second rail 2 may move continuously, and the other may move intermittently.

In the embodiment shown in FIGS. 1 to 5, the relative moving device 5 includes a first rail moving device 11 and a second rail moving device 12 capable of moving the first rail 1 and the second rail 2 independently, respectively. However, the configuration of the relative moving device 5 is not limited to the above embodiment. In one embodiment, as shown in FIG. 6, the relative moving device 5 includes an electric motor 80 connected to the first drive shaft 21 and a torque transmission mechanism for transmitting the torque of the first drive shaft 21 to the second drive shaft 31. It may have 81. The torque transmission mechanism 81 includes a configuration such as a combination of a sprocket and a chain, or a combination of a plurality of gears, and the specific configuration thereof is not particularly limited. In the embodiment shown in FIG. 6, the relative moving device 5 includes a single electric motor 80, and the electric motor 80 drives both the first rail 1 and the second rail 2. The moving direction and relative speed of the first rail 1 and the second rail 2 can be changed by the torque transmission mechanism 81.

FIG. 7 is a side view showing still another embodiment of the classification device, FIG. 8 is a sectional view taken along line BB of FIG. 7, and FIG. 9 is a sectional view taken along line CC of FIG. Since the configuration and operation of the present embodiment, which are not particularly described, are the same as those of the embodiments described with reference to FIGS. 1 to 6, the duplicated description thereof will be omitted.

In the present embodiment, the classification device further includes a protective plate 91 arranged inside the annular first rail 1 and the second rail 2. The protective plate 91 is arranged below the input port 60 and is arranged so as to cover the lower parts of the annular first rail 1 and the second rail 2. More specifically, the protective plate 91 is located in the classification zone and is located between the first driven rotating body 17 and the first driven rotating body 18. The sand (granular matter) that has passed through the first gap between the first rail 1 and the second rail 2 falls on the protective plate 91 and does not fall on the back side of the first rail 1 and the second rail 2. The protective plate 91 has an inclined upper surface 91a, and the sand on the upper surface 91a falls into the hopper 63 due to its own weight.

The rating device further includes a protective plate 92 arranged outside the annular first rail 1 and inside the second rail 2. The protective plate 92 is located in the release zone and is arranged so as to cover the lower portion of the second rail 2 located outside the first rail 1. The incombustible material (oversized material) that has passed through the second gap between the first rail 1 and the second rail 2 falls on the protective plate 92 and does not fall on the back side of the second rail 2. The protective plate 92 has an inclined upper surface 92a, and the incombustible material on the upper surface 92a falls into the chute 65 due to its own weight. In the embodiment shown in FIG. 9, a single protective plate 92 is provided so as to cover the lower portion of the plurality of second rails 2. In one embodiment, a plurality of protective plates 92 may be provided so as to cover the lower portions of the plurality of second rails 2.

FIG. 10 is a side view showing still another embodiment of the classification device, and FIG. 11 is a sectional view taken along line DD of FIG. Since the configuration and operation of the present embodiment, which are not particularly described, are the same as those of the embodiments described with reference to FIGS. 1 to 6, the duplicated description thereof will be omitted.

The rating device includes a plurality of scraping plates 95 fixed to the first rail 1. These scraping plates 95 project outward from the first rail 1 and move (circulate) integrally with the first rail 1. The scraping plate 95 is provided to scrape the sand in the hopper 63 toward the opening 63a. Therefore, in this embodiment, the scraping screw 70 and the screw motor 71 are not provided.

FIG. 12 is a side view showing still another embodiment of the rating system. Since the configuration and operation of the present embodiment, which are not particularly described, are the same as those of the embodiments described with reference to FIGS. 1 to 6, the duplicated description thereof will be omitted. In this embodiment, the rating device includes an air nozzle 97 arranged above the first rail 1 and the second rail 2. The air nozzle 97 faces downward and is connected to a compressed gas source (not shown).

The air nozzle 97 faces the

upper surfaces

1a and 2a of the first rail 1 and the second rail 2. Compressed gas such as compressed air is blown from the air nozzle 97 onto the

upper surfaces

1a and 2a of the first rail 1 and the second rail 2, and fine particles adhering to the first rail 1 and the second rail 2 can be removed.

FIG. 13 is a side view showing still another embodiment of the rating system. Since the configuration and operation of the present embodiment, which are not particularly described, are the same as those of the embodiments described with reference to FIGS. 1 to 6, the duplicated description thereof will be omitted. In the present embodiment, the classification device includes an air nozzle 99 arranged on the back side of the upper part of the first rail 1 and the second rail 2. The air nozzle 99 faces upward and is connected to a compressed gas source (not shown).

The air nozzle 99 faces the first gap between the first rail 1 and the second rail 2. Compressed gas such as compressed air is blown from the air nozzle 99 onto the first rail 1 and the second rail 2, and sand (granular matter) sandwiched between the first rail 1 and the second rail 2 can be removed. ..

Each embodiment shown in FIGS. 1 to 13 can be combined as appropriate. For example, the protective plate 91 and the protective plate 92 shown in FIGS. 7 to 9 may be provided in the embodiment shown in FIGS. 10 to 13.

In each of the above-described embodiments, two types of rails that move relative to each other (that is, the first rail 1 and the second rail 2) are provided, but in one embodiment, three or more types of rails that move relative to each other are provided. May be good. For example, in addition to the first rail 1 and the second rail 2, a third rail may be further provided.

The above-described embodiment is described for the purpose of allowing a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is construed in the broadest range according to the technical idea defined by the claims.

The present invention relates to a classification device for classifying granular substances and coarse substances according to size, and can be used as a classifying device particularly suitable for an application of separating a fluidized medium discharged from a fluidized bed furnace and an incombustible material.

1 1st rail 1a upper surface 2 2nd rail 2a upper surface 5 relative moving device 6 housing 8 1st divided body 9 2nd divided body 10 extension 11 1st rail moving device 12 2nd rail moving device 15 1st endless belt 17th 1 drive rotary body 18 1st driven rotary body 19 1st motor 21 1st drive shaft 24 support shaft 25 2nd endless belt 27 2nd drive rotary body 28 2nd driven rotary body 29 2nd motor 31 2nd drive shaft 41 1st 1 Idler wheel 42 1st wheel holder 51 2nd idler wheel 52 2nd wheel holder 60 Input port 63 Hopper 63a Opening 65 Shoot 68 Partition plate 70 Scraping screw 71 Screw motor 80 Motor 81 Torque transmission mechanism 91 Protective plate 91a Top surface 92 Protective plate 92a Top surface 95 Scraping plate 97 Air nozzle 99 Air nozzle

Claims

A classifier that classifies granules and coarse substances according to their size.
The first and second rails lined up next to each other,
A relative moving device for relatively moving the first rail and the second rail is provided.
A classification device in which a first gap and a second gap larger than the first gap are formed between the first rail and the second rail.
The classification device according to claim 1, wherein the relative moving device is configured to move the first rail and the second rail at different speeds.
The relative moving device alternately repeats a first speed difference operation in which the first rail is moved faster than the second rail and a second speed difference operation in which the second rail is moved faster than the first rail. The classification device according to claim 2, which is configured as described above.
The classification device according to any one of claims 1 to 3, wherein the first rail and the second rail each have an inclined upper surface.
The relative moving device moves the first rail moving device along the first circulation path and the second rail moving along the second circulation path independently of the first rail. The classification device according to any one of claims 1 to 4, further comprising a second rail moving device.
The classification device according to any one of claims 1 to 5, further comprising a gap adjusting device for adjusting the size of the first gap.
The classification device according to claim 6, wherein the clearance adjusting device includes a first idler wheel for positioning the first rail and a second idler wheel for positioning the second rail.
The first rail and the second rail are annular and have an annular shape.
The classification device according to any one of claims 1 to 7, further comprising a ring-shaped first rail and a protective plate arranged inside the second rail.