Grading device
Patent Information
- Application Number
- JP2021171582
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-10-20
- Publication Date
- 2025-06-02
- Estimated Expiration
- 2041-10-20
AI Technical Summary
Existing classifiers for fluidized bed furnaces, such as vibrating screens, generate dust, require expensive vibration-resistant joints, increase structural rigidity, and necessitate frequent cleaning due to clogging, while non-vibrating sieves are prone to snagging and maintenance issues.
A non-vibrating classifier with fixed rails and a conveying member system that separates particulates and coarse matter using inclined surfaces and scraping plates, allowing for a small classification point without vibration, reducing dust generation and maintenance needs.
The solution achieves effective classification without vibration, minimizing dust dispersion and maintenance, while maintaining a classification point equivalent to conventional vibrating screens, and allows for easy release of caught objects.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a classification device for classifying granular materials and coarse materials according to size, and more particularly to a classification device suitable for use in separating a fluid medium and incombustibles discharged from a fluidized bed furnace, for example.
Background Art
[0002] In a fluidized bed furnace used in an incinerator, pyrolysis furnace, gasification furnace, etc., sand is used as a fluid medium. When incombustibles (wires, stones, metals) accumulate in the furnace, poor fluidization occurs. Therefore, the incombustibles are withdrawn from the bottom of the furnace together with the sand, and the sand and incombustibles are separated by a vibrating screen. The classification point of the vibrating screen is about 2.5 mm to 5 mm. The vibrating screen is an essential device for a fluidized bed furnace, but it has the following problems.
[0003] 1. Dust may be generated by vibration, and harmful dust may scatter, deteriorating the working environment. 2. An expansion joint is installed to prevent vibration from being transmitted between the inlet and the outlet. However, this expansion joint is easily damaged by vibration, and dust may leak to the outside. Although there are vibration-resistant expansion joints, this type is generally expensive. 3. During operation, the entire vibrating screen vibrates, so the structures around the vibrating screen vibrate. In order to prevent such vibration, it is necessary to increase the rigidity of the surrounding structures, resulting in increased costs. 4. Depending on the amount and shape of the incombustibles, frequent cleaning of the screen due to clogging of the mesh of the vibrating screen is required, which places a burden on the operator.
[0004] As a non-vibrating screen device, there are a louver type that separates sand and incombustibles by a plurality of inclined bars, a disk screen type that rotates a plurality of continuously arranged disks and feeds sand and incombustibles onto these disks, a trommel type that separates sand and incombustibles by a rotating drum, etc. These types are advantageous in that they do not vibrate, but long and thin objects such as wires are easily caught, and cleaning and maintenance are still required. [Prior art documents] [Patent Documents]
[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-293442 [Overview of the project] [Problems that the invention aims to solve]
[0006] Therefore, the present invention provides a maintenance-free classifier that can achieve a small classification point without vibrating a mixture containing granular material. [Means for solving the problem]
[0007] In one embodiment, a classification device is provided for classifying granular and coarse materials according to their size, comprising: a first fixed rail and a second fixed rail arranged in parallel; a conveying member positioned between the first fixed rail and the second fixed rail and having an inclined upper surface that slopes downward from the first fixed rail toward the second fixed rail; a scraping plate fixed to the inclined upper surface of the conveying member; and a drive device for moving the conveying member from a classification zone to a release zone, wherein the classification zone is located between the first fixed rail and the second fixed rail, the release zone is located away from the first and second fixed rails, and there is a gap between the conveying member and the second fixed rail.
[0008] In one embodiment, the scraping plate has a projection located within the gap. In one embodiment, at least a portion of the top of the first fixed rail and at least a portion of the top of the second fixed rail are inclined downward toward the inclined upper surface. In one embodiment, the scraping plate is inclined in a direction opposite to the direction of movement of the conveying member. In one embodiment, the classification device further comprises a positioning rail extending along at least one of the first fixed rail and the second fixed rail, and the scraping plate has an engaging portion that engages with the positioning rail. In one embodiment, the classification device further comprises a liner positioned between the first fixed rail and the scraping plate. In one embodiment, the drive device is configured to move the transport member along an endless track. In one embodiment, the classification device further includes a protective plate located below the first fixed rail and the second fixed rail, and inside the endless track. [Effects of the Invention]
[0009] According to the present invention, since the granular material is not vibrated, dust is not stirred up. Also, since the gap between the conveying member and the second fixed rail can be made small, a classification point equivalent to that of conventional vibrating screens can be achieved. In the release zone, the conveying member moves away from the second fixed rail, so the gap between the conveying member and the second fixed rail becomes larger. Therefore, any object caught between the conveying member and the second fixed rail is released in the release zone, thus realizing a maintenance-free classification device. [Brief explanation of the drawing]
[0010] [Figure 1] This is a side cross-sectional view showing one embodiment of a classification device. [Figure 2] This is a cross-sectional view along line AA in Figure 1. [Figure 3] This is a top view of the classification apparatus. [Figure 4] This is an enlarged view showing one embodiment of the first classification lane. [Figure 5] This is a side view showing the conveying member and scraping plate. [Figure 6] This is an enlarged view showing one embodiment of a classification device having a positioning mechanism. [Figure 7] This figure shows another example of a positioning mechanism. [Figure 8] It is a diagram showing still another example of the positioning mechanism. [Figure 9] It is a diagram showing still another example of the positioning mechanism. [Figure 10] It is a diagram showing still another example of the positioning mechanism. [Figure 11] It is a diagram showing still another example of the positioning mechanism. **[Embodiments for Carrying out the Invention]**
[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The classification device is used for classifying granular materials and coarse materials according to their sizes. Examples of granular materials include sand as a fluid medium used in a fluidized bed furnace, and examples of coarse materials include incombustibles contained in the raw materials introduced into the fluidized bed furnace.
[0012] FIG. 1 is a side sectional view showing an embodiment of the classification device, FIG. 2 is a sectional view taken along line A-A of FIG. 1, and FIG. 3 is a top view of the classification device. The classification device includes fixed rails 1 and 2 arranged in parallel, a plurality of conveying members 7A arranged between the fixed rail 1 and the fixed rail 2, a plurality of scraping plates 8A fixed to the plurality of conveying members 7A, and a driving device 9 for moving the conveying members 7A along an endless track. The fixed rails 1 and 2 extend in the conveying direction of the mixture containing granular materials and coarse materials.
[0013] The fixed rail 1, the fixed rail 2, the conveying member 7A, and the scraping plate 8A are housed in a housing 10. The fixed rails 1 and 2 are fixed to the housing 10 via brackets not shown, and the positions of the fixed rails 1 and 2 are fixed. As shown in FIG. 1, the end portion 1a of the fixed rail 1 curves downward along the endless track along which the conveying member 7A moves. Although not shown, the end portion of the fixed rail 2 also curves downward along the endless track along which the conveying member 7A moves. The plurality of conveying members 7A are arranged in series in an endless manner.
[0014] The plurality of conveying members 7A are fixed to the driving device 9, and the plurality of conveying members 7A and the plurality of scraping plates 8A are moved along the endless track by the driving device 9. In the present embodiment, the front end and the rear end of each conveying member 7A are perpendicular to the traveling direction, but the front end and the rear end of each conveying member 7A may be inclined with respect to the traveling direction. The plurality of scraping plates 8A are arranged at equal intervals. In the present embodiment, each scraping plate 8A is fixed to each conveying member 7A, but the plurality of scraping plates 8A may be arranged at wider intervals.
[0015] The driving device 9 has an endless belt 12 to which the plurality of conveying members 7A are fixed, a driving rotating body 15 and a driven rotating body 16 that support the endless belt 12, and a prime mover 17 connected to the driving rotating body 15. The plurality of conveying members 7A are fixed to the outside of the endless belt 12. The endless belt 12 is composed of a chain, a wire, or the like. The endless belt 12 is supported by a support rail 20 disposed between the driving rotating body 15 and the driven rotating body 16, and the sagging of the endless belt 12 downward is prevented by the support rail 20. The driving device 9 further includes a plurality of idler wheels 21 that guide the moving direction of the endless belt 12. These idler wheels 21 are disposed below the driving rotating body 15 and the driven rotating body 16.
[0016] In the present embodiment, the endless belt 12 is an endless chain, and the driving rotating body 15 and the driven rotating body 16 are sprockets that support the endless chain. In one embodiment, the endless belt 12 may be an endless wire, and the driving rotating body 15 and the driven rotating body 16 may be pulleys that support the endless wire.
[0017] The prime mover 17 is connected to the drive rotating body 15 via a drive shaft 25. The prime mover 17 is configured to rotate the drive rotating body 15 in a predetermined direction at a predetermined speed. Examples of specific configurations of the prime mover 17 include an electric motor, a combination of an electric motor and an inverter, and a combination of an electric motor and a variable speed gear. The drive rotating body 15 is fixed to the drive shaft 25 and rotates integrally with the drive shaft 25. The drive shaft 25 is rotatably supported by bearings (not shown). The driven rotating body 16 is supported by a support shaft 26.
[0018] The housing 10 has an input port 30 at its top. A mixture containing granular and coarse material is fed into the conveying member 7A from above through the input port 30. Inside the housing 10 are a classification zone where granular material is separated from the mixture, and a release zone where coarse material contained in the mixture is released. The release zone is located downstream of the classification zone in the direction of movement of the conveying member 7A. Some of the multiple conveying members 7A are in the classification zone, and other parts of the multiple conveying members 7A are in the release zone. The portion of the endless belt 12 located in the classification zone is supported by the support rail 20 described above.
[0019] As the multiple transport members 7A and multiple scraping plates 8A are moved along the endless track by the drive unit 9, each transport member 7A and each scraping plate 8A moves from the classification zone to the release zone and then back to the classification zone. In other words, each transport member 7A and each scraping plate 8A circulates between the classification zone and the release zone.
[0020] The combination of fixed rail 1, fixed rail 2, conveying member 7A, and scraping plate 8A constitutes the first classification lane 100A. As will be described later, this first classification lane 100A has the function of classifying granular and coarse materials contained in the mixture according to their size. As shown in Figures 2 and 3, in this embodiment, in addition to the first classification lane 100A, there are second classification lanes 100B, third classification lanes 100C, and fourth classification lanes 100D, which include multiple fixed rails 3 to 5, multiple conveying members 7B to 7D, and scraping plates 8B to 8D. These classification lanes 100B to 100D are arranged in parallel, and two adjacent classification lanes share one identical fixed rail. The basic configuration of these classification lanes 100B to 100D is the same as that of the first classification lane 100A, so the first classification lane 100A will be described in detail below.
[0021] Figure 4 is an enlarged view showing one embodiment of the first classification lane 100A. As shown in Figure 4, the fixed rails 1 and 2 are arranged side by side and are parallel to each other. Each conveying member 7A has an inclined upper surface 31 that slopes downward from fixed rail 1 toward fixed rail 2. The inclination angle of the inclined upper surface 31 is preferably equal to or greater than the angle of repose of the mixture to be classified (e.g., 30°). The top 1b of fixed rail 1 and the top 2b of fixed rail 2 are inclined downward toward the inclined upper surface 31 of the conveying member 7A. In one embodiment, the top of either fixed rail 1 or fixed rail 2 may be inclined downward toward the inclined upper surface 31 of the conveying member 7A. The scraping plate 8A is fixed to the inclined upper surface 31 of the conveying member 7A. The upper end of the scraping plate 8A is higher than fixed rails 1 and 2. This is to allow the scraping plate 8A to scrape away coarse materials that are larger than the distance between fixed rail 1 and fixed rail 2.
[0022] There is a gap G between the conveying member 7A and the fixed rail 2. More specifically, the gap G is formed between the lower edge of the inclined upper surface 31 of the conveying member 7A and the side surface of the fixed rail 2. The scraping plate 8A has a projection 34 located within the gap G. The projection 34 is located at the lower end of the scraping plate 8A and protrudes downward through the gap G. The shape of the projection 34 may be rectangular, triangular, or other. The projection 34 may be plate-shaped, but to improve mechanical strength, the projection 34 may be polygonal or cylindrical. Examples of polygonal prisms include those with triangular, square, pentagonal, or hexagonal cross-sections. Examples of cylindrical shapes include those with circular, elliptical, or semicircular cross-sections.
[0023] The classification apparatus further comprises a liner 40 positioned between the fixed rail 1 and the scraping plate 8A. The liner 40 is fixed to the side of the fixed rail 1 and is in contact with at least one of the scraping plate 8A and the conveying member 7A. The liner 40 extends along the direction of movement of the conveying member 7A. The upper end of the liner 40 is inclined downward toward the inclined upper surface 31 at an angle greater than the angle of repose (e.g., 30° or more) to prevent granular material in the mixture to be classified from accumulating. The liner 40 is made of a highly wear-resistant metal, such as carbon steel such as S45C. The liner 40 is detachably attached to the fixed rail 1 and can be replaced with a new liner 40 when wear progresses.
[0024] The classification zone shown in Figure 1 is located between fixed rail 1 and fixed rail 2, while the release zone is located away from fixed rail 1 and fixed rail 2. Fixed rail 1 and the transport member 7A are aligned side by side, and fixed rail 2 and the transport member 7A are also aligned side by side. In the classification zone, the transport member 7A is moved along fixed rail 1 and fixed rail 2 by the drive unit 9. In the release zone, the transport member 7A is moved away from fixed rail 1 and fixed rail 2 by the drive unit 9, resulting in a widening of the gap G between the lower edge of the inclined upper surface 31 and fixed rail 2.
[0025] Most of the mixture introduced from the input port 30 of the housing 10 falls onto the inclined upper surface 31 of the conveying member 7A. A portion of the mixture introduced from the input port 30 of the housing 10 falls onto the inclined tops 1b and 2b of the fixed rails 1 and 2, slides along the inclined tops 1b and 2b, and falls onto the inclined upper surface 31 of the conveying member 7A. The granular material contained in the mixture moves downward along the inclined upper surface 31 and falls from the conveying member 7A through the gap G. On the other hand, the coarse material contained in the mixture cannot pass through the gap G and remains on the conveying member 7A. In this way, the granular material and coarse material are separated in the classification zone.
[0026] Coarse materials on the conveying member 7A are sent toward the release zone (see Figure 1) by the scraping plate 8A. In the release zone, the conveying member 7A and the scraping plate 8A separate from the fixed rails 1 and 2. As a result, the coarse materials fall from the conveying member 7A. Furthermore, since the gap G widens in the release zone, any objects stuck between the conveying member 7A and the fixed rails 2 are released in the release zone. This configuration enables the realization of a maintenance-free classification device.
[0027] When a mixture is present on the inclined upper surface 31 of the conveying member 7A, a force acts on the conveying member 7A that moves it toward the fixed rail 1. This force causes at least one of the scraping plate 8A and the conveying member 7A to come into contact with the liner 40, and as a result, the gap G between the conveying member 7A and the fixed rail 2 is kept constant. That is, the liner 40 and the fixed rail 1 function as positioning elements for the conveying member 7A. Furthermore, the projection 34 of the scraping plate 8A is located within the gap G, thus ensuring the formation of the gap G. The projection 34 can scrape out objects confined within the gap G, thus cleaning the gap G. The gap G is adjusted by the thickness of the fixed rails 1 and 2. Alternatively, it may be adjusted by the thickness of the liner 40. In one example, the size of the gap G is in the range of 1 mm to 5 mm.
[0028] Figure 5 is a side view showing the conveying member 7A and the scraping plate 8A. The scraping plate 8A is inclined in the opposite direction to the direction of movement of the conveying member 7A (indicated by the arrow). This is so that the projection 34 that makes up the lower end of the scraping plate 8A can easily scrape out granular material stuck in the gap G (see Figure 4). A cover plate 45 is placed between two adjacent conveying members 7A. The cover plate 45 is provided to prevent granular material from getting stuck between the two adjacent conveying members 7A. The cover plate 45 is fixed to one of the two adjacent conveying members 7A. With this configuration, the cover plate 45 can cover the gap between the two adjacent conveying members 7A even when the direction of movement of the conveying member 7A changes.
[0029] The second classification lane 100B, the third classification lane 100C, and the fourth classification lane 100D have the same configuration and function as the first classification lane 100A, as described with reference to Figures 1 to 5. A shared fixed rail exists between two adjacent classification lanes. This fixed rail prevents lateral displacement of the conveying member from laterally displacing the conveying member of the adjacent classification lane. As a result, the gap G between each classification lane can be kept constant. In the embodiment described with reference to Figures 1 to 5, four classification lanes 100A to 100D are provided, but fewer than four classification lanes may be provided, or five or more classification lanes may be provided.
[0030] As shown in Figures 1 and 2, the classification device has a hopper 51 and a chute 55 located below the conveying member 7A. The hopper 51 is located below the input port 30 and the classification zone, and the chute 55 is located below the release zone. The hopper 51 has an opening 51a for discharging granular materials such as sand. The chute 55 is an outlet for discharging coarse materials such as non-combustible materials.
[0031] A partition plate 58 is positioned between the hopper 51 and the chute 55. The partition plate 58 protrudes upward from the boundary between the hopper 51 and the chute 55. This partition plate 58 is provided to prevent granular material that has fallen from the conveying member 7A in the classification zone from entering the chute 55, while preventing coarse material released in the release zone from entering the hopper 51. The horizontal position and angle of the partition plate 58 may be adjustable.
[0032] Inside the hopper 51, a scraping screw 60 is positioned to scrape up granular material that has fallen from the conveying member 7A in the classification zone. The scraping screw 60 is connected to a screw motor 61 and rotated by the screw motor 61. The sand inside the hopper 51 is scraped towards the opening 51a of the hopper 51 by the rotating scraping screw 60.
[0033] As shown in Figures 1 and 2, the classification device further includes a protective plate 65 positioned below the fixed rails 1 and 2 and inside the endless track on which the conveying member 7A moves. The protective plate 65 is positioned below the input port 30 and the classification zone and is positioned to cover the back side of the conveying member 7A. Granular material such as sand that passes through the gap G between the fixed rail 21 and the conveying member 7A falls onto the protective plate 65 and does not fall on the back side of the conveying member 7A. The protective plate 65 has a roof shape. More specifically, the protective plate 65 has an inclined upper surface, and granular material on the upper surface of the protective plate 65 falls into the hopper 51 due to its own weight.
[0034] Next, another embodiment of the classification device will be described with reference to Figure 6. The configuration and operation of this embodiment, which will not be specifically described, are the same as those of the embodiment described above with reference to Figures 1 to 5, so a redundant explanation will be omitted. As shown in Figure 6, the classification device is equipped with a positioning mechanism 80 for stabilizing the vertical position of the scraping plate 8A and the conveying member 7A. More specifically, the classification device is equipped with a positioning rail 81 that extends along the fixed rail 2, and the scraping plate 8A has an engaging portion 82 that engages with the positioning rail 81. The positioning rail 81 extends in the direction of movement of the conveying member 7A in the classification zone.
[0035] In this embodiment, the positioning rail 81 is a protruding rail that extends from the side of the fixed rail 2 toward the scraping plate 8A, and the engaging portion 82 is a recess formed on the side of the scraping plate 8A. The positioning rail 81 and the engaging portion 82 have a triangular cross-sectional shape to facilitate the downward movement of the granular material. The positioning rail 81 may be integrated with the fixed rail 2, or it may be fixed to the fixed rail 2 as a separate component. The engagement between the positioning rail 81 and the engaging portion 82 can stabilize the vertical position of the scraping plate 8A and the conveying member 7A.
[0036] Figure 7 shows another example of the positioning mechanism 80. In the example shown in Figure 7, the positioning mechanism 80 has a positioning rail 81 extending along the fixed rail 1 and an engaging portion 82 formed on the scraping plate 8A. More specifically, the positioning rail 81 is a protruding rail that extends from the side of the liner 40 along the fixed rail 1 toward the scraping plate 8A, and the engaging portion 82 is a recess formed on the side of the scraping plate 8A. The positioning rail 81 and the engaging portion 82 have a triangular cross-sectional shape to facilitate the downward movement of the granular material. In the example shown in Figure 7, the engagement between the positioning rail 81 and the engaging portion 82 can stabilize the vertical position of the scraping plate 8A and the conveying member 7A.
[0037] In one embodiment, the classification device may include both the positioning mechanism 80 shown in Figure 6 and the positioning mechanism 80 shown in Figure 7.
[0038] Figure 8 shows yet another example of the positioning mechanism 80. In the example shown in Figure 8, the positioning mechanism 80 has a positioning rail 81 extending along the fixed rail 2 and an engaging portion 82 formed on the scraping plate 8A. More specifically, the positioning rail 81 is a grooved rail formed on the side surface of the fixed rail 2, and the engaging portion 82 is a projection formed on the side of the scraping plate 8A. The positioning rail 81 and the engaging portion 82 have a triangular cross-sectional shape to facilitate the downward movement of the granular material. In the example shown in Figure 8, the engagement between the positioning rail 81 and the engaging portion 82 can stabilize the vertical position of the scraping plate 8A and the conveying member 7A.
[0039] Figure 9 shows yet another example of the positioning mechanism 80. In the example shown in Figure 9, the positioning mechanism 80 has a positioning rail 81 extending along the fixed rail 1 and an engaging portion 82 formed on the scraping plate 8A. More specifically, the positioning rail 81 is a grooved rail formed on the side surface of the liner 40 extending along the fixed rail 1, and the engaging portion 82 is a projection formed on the side of the scraping plate 8A. The positioning rail 81 and the engaging portion 82 have a triangular cross-sectional shape to facilitate the downward movement of the granular material. In the example shown in Figure 9, the engagement between the positioning rail 81 and the engaging portion 82 can stabilize the vertical position of the scraping plate 8A and the conveying member 7A.
[0040] In one embodiment, the classification device may include both the positioning mechanism 80 shown in Figure 8 and the positioning mechanism 80 shown in Figure 9.
[0041] Figure 10 shows yet another example of the positioning mechanism 80. In the example shown in Figure 10, the positioning mechanism 80 has a positioning rail 81 extending along the fixed rail 2 and an engaging portion 82 formed on the scraping plate 8A. More specifically, the positioning rail 81 is a protruding rail projecting from the upper end of the side surface of the fixed rail 2 toward the scraping plate 8A, and the engaging portion 82 is a stepped portion formed on the side of the scraping plate 8A. The positioning rail 81 may be bolted in place to allow for replacement and fine adjustment of its position. The positioning rail 81 has a triangular cross-sectional shape to facilitate the downward movement of granular material. In this embodiment, since the scraping plate 8A is not located above the upper surface of the positioning rail 81, granular material is not caught between the upper surface of the positioning rail 81 and the scraping plate 8A.
[0042] Figure 11 shows yet another example of the positioning mechanism 80. In the example shown in Figure 11, the positioning mechanism 80 has a positioning rail 81 extending along the fixed rail 1 and an engaging portion 82 formed on the scraping plate 8A. More specifically, the positioning rail 81 is a protruding rail that projects toward the scraping plate 8A from the upper end of the side surface of the liner 40 extending along the fixed rail 1, and the engaging portion 82 is a stepped portion formed on the side of the scraping plate 8A. The positioning rail 81 may be bolted in place to allow for replacement and fine adjustment of its position. The positioning rail 81 has a triangular cross-sectional shape to facilitate the downward movement of the granular material. In this embodiment as well, since the scraping plate 8A is not located above the upper surface of the positioning rail 81, the granular material is not caught between the upper surface of the positioning rail 81 and the scraping plate 8A.
[0043] In one embodiment, the classification device may include both the positioning mechanism 80 shown in Figure 10 and the positioning mechanism 80 shown in Figure 11.
[0044] The embodiments described above are intended to enable persons with ordinary skill in the art to implement the present invention. Various modifications of the above embodiments can be made naturally by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments as well. Therefore, the present invention is not limited to the embodiments described, but is to be interpreted in the broadest sense according to the technical idea defined by the claims. [Explanation of Symbols]
[0045] 1-5 Fixed rails 7A~7D Conveyor components 8A~8D Scraping board 9. Drive unit 10 Housing 12 Endless belt 15. Drive Rotating Body 16 Driven Rotating Body 17. Engine 20 Support rails 21 Idler Wheel 25 Drive shaft 26 Support shaft 30 Inlet 31 Slanted top surface 34 Protrusion 40 Liner 45 Cover plate 51 Hoppa 51a aperture 55 shots 58 Partition Plate 60. Scraping Screw 61 Screw motor 65 Protective plate 80 Positioning mechanism 81 Positioning rail 82 Engaging part 100A~100D Classification Lanes G Gap
Claims
1. A classifying device for classifying granular and coarse materials according to size, a first fixed rail and a second fixed rail arranged in parallel; a conveying member disposed between the first fixed rail and the second fixed rail, the conveying member having an inclined upper surface that slopes downward from the first fixed rail toward the second fixed rail; a scraping plate fixed to the inclined upper surface of the conveying member; a drive device that moves the conveying member from the classification zone to the release zone; the classification zone is located between the first fixed rail and the second fixed rail, the release zone is located at a distance from the first fixed rail and the second fixed rail; A classification device, wherein there is a gap between the transport member and the second fixed rail.
2. The classification device according to claim 1 , wherein the scraper plate has a protrusion located within the gap.
3. The classification device according to claim 1 or 2, wherein at least a portion of the top of the first fixed rail and at least a portion of the top of the second fixed rail are inclined downward toward the inclined upper surface.
4. The classification device according to claim 1 , wherein the scraper plate is inclined in a direction opposite to a moving direction of the transport member.
5. the classification device further includes a positioning rail extending along at least one of the first fixed rail and the second fixed rail; The classification device according to claim 1 , wherein the scraper plate has an engaging portion that engages with the positioning rail.
6. The classification device according to claim 1 , further comprising a liner disposed between the first fixed rail and the scraper plate.
7. The classifying device according to claim 1 , wherein the drive device is configured to move the transport member along an endless track.
8. The classification device according to claim 7 , further comprising a protective plate disposed below the first fixed rail and the second fixed rail and inside the endless track.