Sorting and drying systems

Abstract

To provide a selection device capable of efficiently selecting dissimilar materials with a simple constitution without any rise in cost.SOLUTION: A selection device comprises: a belt conveyor 2 for conveyance which is extended between around a plurality of first and second rotary parts 2A, 2B, the first rotary part 2A downstream in a moving direction of a conveyance surface 2C where a dissimilar material is placed being located higher than the second rotary part 2B upstream in the moving direction; an air blowing part 3 which has an air discharge part 3A exposed nearby the first rotary part 2A downstream in the moving direction of the conveyance surface 2C of the belt conveyor 2 for conveyance; and a material sorting part 4 which comprises a first sorting part 41 where a material S1 small in specific gravity among dissimilar materials to be selected is sorted and a second sorting part 42 where a material S2 large in specific gravity is sorted, wherein an air current is jetted from the air discharge part 3A of the air blowing part 3 toward the first sorting part 41, and a part of the air current has its flow passage changed to pass above the second sorting part 42.SELECTED DRAWING: Figure 3B

Description

[Technical field]

[0001] The present invention relates to a sorting device that separates different types of materials according to their specific gravity and to a material drying system that uses the same. [Background technology]

[0002] 2. Description of the Related Art Wood pellets produced from wood chips obtained by crushing wood materials, which are forestry resources, have been known as one of the resources used to secure renewable energy. Wood pellets are obtained by drying crushed wood chips and molding them into pellets of a predetermined size and shape. Wood chips are made by crushing thinning materials and other materials into small pieces, which are then loaded onto a transport truck and transported to the drying section.

[0003] Before being transported to the drying section, the wood chips may contain foreign objects such as stones during transportation or accumulation. Therefore, a device is required to remove the foreign objects and select only the wood chips before they are transported to the drying section. There are devices for separating wood pieces and stone materials that utilize the difference in specific gravity between the two materials (for example, Patent Documents 1 to 4). In both documents, an air jet is applied from a direction opposite to the direction of movement of the objects to be sorted, and the difference in the amount of inertial movement due to the specific gravity and shape of the objects to be sorted is utilized. Specifically, an air jet is applied to the sorting objects moving on a conveyor belt from a direction opposite to the direction of movement, and sorting is performed based on the difference in the amount of inertial movement, or in other words, the falling position, caused by the difference in air resistance generated by the sorting objects as they attempt to fly out from the end of the conveyor belt in the direction of movement.

[0004] However, while selection is possible by applying an air jet against the direction of movement of the sorting objects, there was a risk that control of the amount of air would become complicated if the air resistance, which affects the amount of inertial movement, was to be set according to the specific gravity and shape of each sorting object. In addition, in order to accurately determine the drop positions according to differences in specific gravity, it is also necessary to provide a nozzle or the like for spraying air to drop the particles at the drop positions according to the respective specific gravities. As a result, there is a concern that it may become difficult to control the sorting of each of the different materials, and that costs may increase due to the need to add additional parts. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6283958 [Patent Document 2] Patent No. 5980734 [Patent Document 3] Japanese Utility Model Application Publication No. 52-114357 [Patent Document 4] JP 2000-246179 A Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-mentioned problems, an object of the present invention is to provide a sorting device and a drying system that can efficiently sort different types of materials with a simple configuration without increasing costs. [Means for solving the problem]

[0007] One aspect of the present invention is, for example, A sorting device for sorting different materials by specific gravity from among a mixture of different materials with different specific gravities, the sorting device comprising: a conveyor belt that is hung around a plurality of rotating parts, and a first rotating part on the downstream side of a conveying surface on which the different materials are placed is positioned higher than a second rotating part on the upstream side of the conveying surface; The air outlet portion has an air outlet that outlets air in a direction along the surface of the portion wrapped around the first rotating portion and in a direction along the rotation direction. a blowing unit; and a flow path changing unit that sucks in the airflow ejected from the air discharge unit of the blowing unit and changes a flow path of a part of the airflow; a material sorting section having a first sorting section for sorting materials having a light specific gravity among the different materials to be sorted by the air discharged by the air blowing section, and a second sorting section for sorting materials having a heavy specific gravity, the air discharge section of the air blowing section injects the airflow toward the first sorting section, the flow path changing section has an air intake port arranged to face the flying direction of the materials having a heavy specific gravity flying from the conveyor belt, and the air intake port takes in air so as to be a favorable wind for the flying direction of the materials having a heavy specific gravity, thereby changing the flow path of a part of the airflow to pass above the second sorting section. A sorting device characterized by It is. Effect of the Invention

[0008] According to the present invention, it is possible to provide a sorting device and a drying system that can efficiently sort different types of materials with a simple configuration without increasing costs. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram for explaining an overall configuration of a sorting device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram for explaining a configuration of a main part of the sorting device shown in FIG. [Figure 3A] FIG. 4 is a side view showing details of the air blowing means of the sorting device according to the present embodiment. [Figure 3B] FIG. 2 is a front view showing details of the air blowing means of the sorting device according to the present embodiment. [Figure 3C] FIG. 2 is a plan view showing details of an air blowing unit of the sorting device according to the present embodiment. [Figure 4] FIG. 2 is a schematic diagram of a pellet production plant, which is an example of a material drying system using the sorting device shown in FIG. 1. [Diagram 5] FIG. 5 is a perspective view showing a schematic configuration of the pellet production plant shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described. As shown in FIG. 1, a sorting device 1 according to an embodiment of the present invention is a device used for separating and sorting different materials having different specific gravities and shapes according to their specific gravities. The sorting device 1 includes a transport belt conveyor 2 around which a pair of rollers 2A, 2B serve as a rotating part, and an air blowing means 3. In FIG. 1, the transport belt conveyor 2 is a member in which one of the flat surfaces (the upper flat surface in the figure) stretched between rollers 2A and 2B (first rotating portion, second rotating portion) is used as a transport surface. In the conveyor belt 2, one of the rollers 2A and 2B (the roller designated by reference symbol 2A in FIG. 1) is rotated by a drive belt B using a motor M as a drive source.

[0011] The conveying surface 2C, which uses the upper flat surface of the conveying belt conveyor 2, has roller 2A (first rotating part) on the downstream side in the moving direction indicated by the arrow corresponding to the different material discharge side, and roller 2B (second rotating part) on the upstream side in the moving direction corresponding to the different material input side. The conveyor belt 2 is positioned such that the rollers 2A on the dissimilar material discharge side are positioned higher than the rollers 2B on the dissimilar material intake side. In other words, the conveyor belt 2 is inclined so that the dissimilar material discharge side, where dissimilar materials fly out from the end of the conveyor belt 2 in the moving direction, is higher than the dissimilar material intake side, where dissimilar materials are unloaded from a transport means such as a truck T.

[0012] A sirocco fan connected to an air discharge section 3A is used as the air blowing means 3. The air blowing means 3 has a support stand 3B fixed to the upper part of the material sorting section 4. Although not shown, the material sorting unit 4 has a plurality of material storage units at its lower part. The material storage units are arranged at positions corresponding to the positions at which different types of materials that fly out due to inertial movement from the end of the downstream side in the moving direction of the conveyor belt 2 will fall.

[0013] As shown in FIG. 1(B), the air blowing means 3 has an air discharge portion 3A facing the vicinity of the first rotating portion on the downstream side in the moving direction of the transport belt conveyor 2. The air discharge unit 3A is disposed near the roller 2A located in the first rotating unit, at a position with a horizontal gap L. The reason for providing the horizontal gap L is to expand the air ejection range for moving the material in a direction different from the inertial movement direction of other dissimilar materials according to the orientation of the air discharge unit 3A described in Fig. 2.

[0014] The direction of the air discharge portion 3A of the blowing means 3 with respect to the transport belt conveyor 2 is determined according to the following conditions. In Figure 2(A), the orientation of the air discharge section 3A is set so that a portion of the different materials that have reached the downstream side in the moving direction of the conveying surface 2C of the conveying belt conveyor 2 can be guided toward the lower 1 / 4 of the circumference of the roller 2A, as shown by symbol S1 in Figure 2(B).

[0015] 2(A), the direction of the air discharge section 3A is set at an acute angle θ toward the circumferential surface on the fourth quadrant side with respect to a tangent P set at the boundary G between the first and fourth quadrants of the roller 2A at the rotating section downstream in the moving direction of the conveying surface 2C. Here, the first and fourth quadrants are the first and fourth quadrants when considering an orthogonal coordinate system with the rotation axis of the roller 2A as the origin. The air ejected from the air discharge section 3A, which is inclined at an acute angle θ with respect to the tangent line P, generates a tangential airflow on the peripheral surface below the boundary G of the fourth quadrant, which corresponds to the lower 1 / 4 peripheral surface of the first rotating part, which corresponds to the downstream side in the moving direction of the conveying surface 2C, as shown by the symbol F(S) in Figure 2(A). The flow speed of the air blown from the air discharge section 3A of the air blowing means 3 is set to a speed faster than the moving speed of the conveyor belt 2 and to a speed at which a part of the dissimilar material having a smaller specific gravity than the other dissimilar materials can be easily separated from the other dissimilar materials and allowed to fall.

[0016] FIG. 3 is a diagram showing details of the air blowing means of the sorting device according to this embodiment, where FIG. 3A is a side view, FIG. 3B is a front view, and FIG. 3C is a plan view. As shown in Fig. 3A, the blower means 3 has two high-pressure plate fans 311, 312 provided on a table 301. The high-pressure plate fans 311, 312 are provided with an impeller (not shown) having a plurality of blades arranged radially inside a casing. When the impeller rotates at high speed, air that flows in from the axial direction of the impeller (see Fig. 3A) is blown out in the tangential direction of the impeller (see Fig. 3B).

[0017] In the high-pressure plate fan 311, a duct hose 321 connected to an air intake is connected to an inlet 311a, and a duct hose 322 connected to an air discharge unit 3A is connected to an outlet 311b (see FIG. 3C). As shown in FIG. 3C, the air discharge unit 3A is a long, thin, flat nozzle that covers the width of the transport belt conveyor 2.

[0018] On the other hand, high-pressure plate fan 312 has a similar structure to high-pressure plate fan 311, and outlet 312b is connected to duct hose 324. Duct hose 324 further branches into duct hoses 325 and 326, as shown in Fig. 3C, and is connected to air discharge section 3A.

[0019] The material sorting section 4 includes a storage enclosure 41 in which the wood pieces are sorted and stored, and a dust box 42 in which foreign objects such as stones are sorted and stored. In Fig. 2, the storage enclosure 41 is preferably placed at a position where the wood pieces S1 fall, and the dust box 42 is preferably placed at a position where the foreign objects S2 fall. The bottom of the enclosure 41 has an opening, and a belt conveyor (not shown) is disposed directly below the opening. The wood chips sorted into the enclosure 41 fall onto the belt conveyor, which transports them through the pipeline 1A to a primary feeder 101A (see FIG. 5) of the biomass material introduction section 101, which will be described later. An air intake port connected to a duct hose 321 is opened in the pipeline 1A. The air in the pipeline 1A is sucked in through the air intake port by the high-pressure plate fan 311, and circulated so that it is ejected from the air discharge section 3A. By circulating the airflow in this manner, not only can the scattering of dust be prevented, but the airflow can also be circulated efficiently, and the wood chips that fall into the enclosure 41 together with part of the airflow can be efficiently collected. On the other hand, the dust box 42 is disposed under the table 301 , and a duct 302 is provided between an upper opening 42 a of the dust box 42 and the table 301 . A duct hose 323 is provided at the intake port 302a of the duct 302, and as shown in Fig. 3B, is connected to the air inlet 312a of the high-pressure plate fan 312. The air sucked in from the intake port 302a by the high-pressure plate fan 312 circulates to be ejected from the air discharge section 3A.

[0020] The sorting device 1 having the above-mentioned configuration can load different materials S unloaded from a transportation means such as a truck T onto a conveyor belt 2 for transport, as shown in FIG. The different materials loaded on the conveying surface 2C of the conveyor belt 2 reach the first rotating portion of the conveying surface 2C as the conveyor belt 2 moves. The conveying surface 2C of the conveyor belt 2 is structured like a ski jump, since the unloading side is higher than the loading side (the position of roller 2A is higher than the position of roller 2B). This allows the different materials to fly higher and farther when a vertical force is applied to them to fly from the discharge end. Flying higher and farther allows the amount of inertial movement of materials with a higher specific gravity to be greater than that of materials with a lower specific gravity under the same air resistance conditions, making it easier to visually identify them when sorting.

[0021] On the other hand, in this embodiment, air is blown out from the blowing means 3 on the discharge side. The air blown out from the blowing means 3 is not directed directly toward the direction of movement of the different materials moving on the conveying surface 2C of the conveying belt conveyor 2, but is directed in the tangent direction of the circumferential surface of the lower 1 / 4 of the roller 2A used in the first rotating section. In the first rotating section, the flow speed of the air blown out from the air discharge section 3A toward the roller 2A on the surface of the fourth quadrant of the roller 2A is faster than the moving speed of the conveying belt conveyor 2, so that the pressure on the surface of the fourth quadrant can be reduced. As a result, when a piece of wood with a low specific gravity that is part of a different material (indicated by the symbol S1 in Figure 2) reaches the first rotating part of the conveying belt conveyor 2, due to the low surface pressure, it is likely to be sucked in or move toward the fourth quadrant circumferential surface. Furthermore, if the wood piece S1 attempts to fly in the inertial movement direction without following the peripheral surface of the first rotating part, it will be blown toward the fourth quadrant of the roller 2A located in the first rotating part by the air jet from the blowing means 3, making it difficult for the wood piece S1 to fly in the inertial movement direction from the end of the conveying surface 2C.

[0022] When the air blowing means 3 blows air from the air discharge portion 3A, it can separate and drop the wood pieces S1 adhering to foreign objects (denoted by the symbol S2 in FIG. 2) such as stones having a large specific gravity. A foreign object S2 such as a stone having a large specific gravity contained in the different materials encounters resistance from the air from the blowing means 3 when it flies due to inertial movement from the downstream end position in the moving direction of the transport belt conveyor 2. At this time, the foreign object S2 has a larger specific gravity than the wood piece S1, so unlike the wood piece S1 with its smaller specific gravity, the acceleration loss is small and the foreign object S2 falls to a farther position. In other words, based on the law of inertia (α=F / M), the loss of acceleration is small, which increases the flying distance.

[0023] According to the sorting device 1 of this embodiment, by setting the direction of the air discharge section 3A of the blowing means 3, wood pieces S1 with low specific gravity can be sorted simply by moving them in a direction other than the direction in which they fly from the conveying surface 2C. In particular, foreign objects such as stones S2 with a high specific gravity fly in the direction of inertial movement, whereas wood pieces S1, which are materials with a low specific gravity, are selected by setting only the flow velocity that allows them to be sucked or brought close to the peripheral surface of roller 2A located at the first rotating portion of the conveying surface. As a result, there is no need for air volume control or nozzles for dropping the materials at each drop position, so sorting work can be performed with a simple configuration without increasing costs, unlike when additional equipment is installed or complex air volume control is required.

[0024] Moreover, the high-pressure plate fan 311 of the blowing means 3 ejects air drawn in from an air inlet (see FIG. 3A) from the air ejection section 3A (see FIG. 3C). The air ejection section 3A ejects airflow downward toward the first sorting section, as shown by the dashed arrow in FIG. 3B. The wood pieces S1 that receive the ejected airflow fall into the storage enclosure 41 that is located substantially on the extension line of the ejected airflow.

[0025] At this time, the high-pressure plate fan 312 is sucking in the air in the duct 302, so that part of the airflow ejected from the air discharge unit 3A changes its direction from the direction of the airflow at the time of ejection so as to pass above the dust box 42 of the material sorting unit 4, and changes its flow path (flow path changing unit). Therefore, the foreign matter S2 is efficiently contained in the dust box 42 by this airflow.

[0026] Thereafter, the airflow that has passed above the dust box 42 inside the duct 302 is sucked in through the intake port 302a and returned to the blowing means 3, and circulated by the high-pressure plate fan 312 through the flow path of FIG. 3B (air discharge section 3A, duct 302, duct hose 323, high-pressure plate fan 312, duct hoses 324, 325, 326, air discharge section 3A) (circulation section).

[0027] Furthermore, in addition to the airflow circulated and supplied to the air discharge section 3A by the high-pressure plate fan 312, the airflow replenished from the air intake port by the high-pressure plate fan 311 is also supplied to the air discharge section 3A, so that the airflow is ejected from the air discharge section 3A with high wind pressure.

[0028] As described above, the circulation of high-pressure air not only prevents dust from scattering, but also smooths the air flow in the area indicated by the dashed arrows in Figure 3B, allowing for efficient separation of foreign matter S2. As a result, the recovery rate of wood chips S1 was improved by approximately 10% compared to the case where there was no flow path in Figure 3B.

[0029] The sorting device 1 having the above-mentioned configuration can be used in a system for producing wood pellets using wood chips as a raw material. Below, an outline of the wood pellet material drying system will be explained using Figures 4 and 5. FIG. 4 is a schematic diagram of a pellet production plant used in a material drying system for obtaining wood pellets, and FIG. 5 is a perspective view showing a schematic configuration of the pellet production plant shown in FIG.

[0030] The pellet production plant 100 shown in Figure 3 targets wood biomass materials such as wood chips, which are combustible materials, as the material to be dried. However, the material is not limited to this, and it is also possible to target materials to be dried that are not combustible, including powders, etc. In Figure 3, the pellet production plant 100 is equipped with the following process sections for drying wood chips obtained from biomass material crushed wood pieces, molding them into wood pellets, and packaging the molded wood pellets into bags as finished pellet products. The process section for drying treatment is equipped with a biomass material introduction section 101 that supplies wood chips, which use crushed wood pieces, to a drying process section 102, the drying process section 102 equipped with a rotatable heater 200 such as a rotary kiln, and a supply section 103 for heated air used in the drying process. The biomass material introduction section 101 corresponds to the introduction section for the material to be dried.

[0031] In order to mold the dried wood chips into pellets, for example, the following process is used. (1) A secondary grinding process section 104 for re-grinding the dried wood chips; (2) A secondary supply process section 105 which re-dries wood chips whose moisture content does not reach a predetermined value in a drying process section 102 and transports wood chips whose moisture content reaches the predetermined value to a molding process section 106 for molding; (3) a molding process section 106 equipped with a molding machine 106A for molding the wood chips selected from the secondary supply process section 105 into pellets; It is. The biomass material that has been made into wood pellets through the molding process section 106 and meets specified conditions such as a specified shape or size is cooled in the cooling process section 107 and then transported to the bagging process section 108 for bagging as finished pellets. Among the above-mentioned process sections, the sorting device 1 shown in FIG.

[0032] The wood chips taken in for the drying process section 102 are sorted in a process preceding the biomass material introduction section 101, where the wood pieces transported by truck T are separated from foreign objects such as stones that are mixed in with the wood chips, and foreign objects such as metals are removed before the wood chips are introduced into the drying process section 102. In the sorting device 1, the wood chips S1 (see Figs. 2 and 3B) sorted from the stones S2 (see Fig. 2) in the material sorting section 4 are sent from the material sorting section 4 through a pipeline 1A to a primary feeder 101A equipped with a magnetic separator (not shown). In the primary feeder 101A, metal pieces and the like are removed by the magnetic separator, and then a crushing process is carried out to form small wood chips. The small wood chips are transported to a material introduction section 101C in the heater 200 of the drying process section 102 through a pipeline 101B (see Fig. 4).

[0033] The process of manufacturing wood pellets by subjecting wood chips transported from the primary supply machine 101A to drying process section 102 will be described below. The secondary crushing process section 104 is equipped with a crusher 104A and a humidity sensor (not shown) for crushing the wood chips that have been through the drying process into a predetermined size and transporting the wood chips having a predetermined moisture content to the secondary supply process section 105. Note that the moisture content can be measured not only by using a humidity sensor, but also by a worker using a moisture meter, and a sieving process can be performed based on the results. The crusher 104A is a hammer mill (not shown) equipped with a hammer that rotates at high speed inside a filter that determines the crushing size. The wood chips are crushed by the hammer, and those that fit the filter size are transported to the next process.

[0034] The wood chips crushed in the secondary crushing process section 104 are sorted into different transport routes according to their moisture content. That is, wood chips whose moisture content meets a predetermined condition are transported toward the secondary supply process section 105, and wood chips whose moisture content does not meet the predetermined condition are transported again to the drying process section 102. For this reason, the transport direction of the wood chips discharged from the crusher 104A is determined by either of the conveyors 104B and 104C, which can sift and transport the chips according to their moisture content. Of these conveyors 104B, 104C, conveyor 104B, which is the first to receive wood chips, is equipped with a screening mechanism and transports wood chips whose moisture content meets a predetermined condition toward secondary supply process section 105. Screening based on differences in moisture content can be performed using, for example, a mechanism that sets capture conditions at the time of air transport or introduction using the difference in weight due to differences in moisture content as a parameter.

[0035] The other conveyor 104C is connected to a bypass secondary supply process section 109, which transports wood chips in a bypass manner to a preparatory process for re-drying wood chips whose moisture content does not satisfy the specified conditions. The bypass secondary supply process section 109 is equipped with a bypass secondary supply conveying device 109A capable of conveying wood chips while stirring them, a cyclone rotary valve 109B that separates the air used for airflow conveying from the wood chips, and a bagging machine (flexible container bagging machine) 109C. In the bypass secondary supply process section 109, the wood chips separated from the air in the cyclone rotary valve 109B are bagged by a bagger 109C so as to be easily transported to the drying process section .

[0036] Wood chips whose moisture content meets a predetermined condition are molded into pellets, for example by being pressed and condensed, by a molding machine 106A provided in the molding process section 106. In the molding process section 106, defective products, such as wood chips that have not been molded into pellets, are sorted out, and only non-defective products are transported to a bagging process section 108 to be bagged as finished products. Wood chips that are determined to be defective are transported to a cyclone rotary valve 109B and bagged by a bagging machine 109C in the same way as for re-drying.

[0037] The biomass material is molded into a specified shape and size in the molding process section 106 and used as wood pellets. The non-defective biomass material is cooled as a finished product in the cooling process section 107, and then packed in a bag in the bagging process section 108 and prepared for shipment as a finished product. The cooling process section 107 is equipped with transport conveyors 107A and 107B that transport the biomass material to be used as wood pellets after the molding process section 106 toward the bagging process section 108. A nozzle 107A1 and a blower 107A2 for blowing cooling air are disposed on the upper portion of one of the transport conveyors, 107A.

[0038] Drying process section 102, into which wood chips are introduced from primary supply device 101A, is equipped with heater 200, which is a rotatable cylinder. Heater 200 has multiple blades inside, and when rotating, it transports the wood chips with an air current and agitates them, thereby evaporating the moisture contained in the wood chips. The heater 200 is connected to a heated air supply unit 103, and heated air is supplied into the heater 200 in the longitudinal direction thereof, whereby the wood chips are dried by air current transport and agitation. The wood chips that have passed through the heater 200 are formed into wood pellets through the above steps (1) to (3).

[0039] As described above, the heterogeneous materials supplied to the material drying system can be sorted to select only the required contents from the heterogeneous materials, thereby preventing damage to equipment caused by unwanted foreign matter in other processes.

[0040] 3 and 4, the explanation is directed to a case where the transport belt conveyor 2 used in the sorting device 1 is one stage, but in this embodiment, it is also possible to connect multiple stages of transport belt conveyors and make the speed of each transport belt conveyor different (the roller 2A side is faster than the roller 2B). With this structure, the objects to be sorted transported by truck can be easily spread out and loaded onto the conveyor, and the speed at which different materials fly out from the end on the discharge side can be increased. [Explanation of symbols]

[0041] 1. Sorting device 2. Conveyor belt 2A Roller located on the dissimilar material discharge side 2B Roller located on the dissimilar material inlet side 2C Conveying surface 3. Air supply means 3A Air outlet 4. Material sorting section 41 Containment Enclosure 42 Dustbin 100 Pellet Manufacturing Plant 101 Biomass Material Introduction Section 101A Primary supply machine 102 Drying process department 200 Heater G Boundary between the first and fourth quadrants

Claims

1. A sorting device that sorts different materials according to their specific gravities from a sorting object in which different materials with different specific gravities are mixed, comprising: a conveyor belt that is wound around a plurality of rotating parts, and a first rotating part on a downstream side in a moving direction of a conveying surface on which the different materials are placed is positioned higher than a second rotating part on an upstream side in the moving direction; a blower having an air discharge part that discharges air in a direction along a surface of a portion of the conveyor belt that is wound around the first rotating part and in a direction along a rotation direction of the portion; a flow path changing section that sucks in the air flow jetted from the air discharge section of the blower section and changes a flow path of a part of the air flow; The air discharged by the blower and a material sorting section including a first sorting section for sorting materials having a low specific gravity among the different materials to be sorted, and a second sorting section for sorting materials having a high specific gravity, The air discharge unit of the blower unit injects the airflow toward the first sorting unit, The flow path changing unit is an air intake port arranged to face a flying direction of the heavy material flying from the conveying belt conveyor; The air intake port takes in air so that the wind is in line with the flying direction of the heavy material, thereby changing the flow path of a part of the airflow to pass above the second sorting section. A sorting device characterized by:

2. In the sorting device according to claim 1, A circulation section is provided for sucking the air flow, returning it to the blowing section, and ejecting it from the air ejection section. The sorting device according to the present invention is characterized in that

3. In the sorting device according to claim 1 or claim 2, The air discharge section of the blower section is When viewed from the direction of the rotation axis of the first rotating part, a part of the different material is oriented along a peripheral surface on the fourth quadrant side with respect to a tangent line set at a boundary between a first quadrant and a fourth quadrant of an orthogonal coordinate system on a plane having the rotation axis of the first rotating part as its origin. A sorting device characterized by:

4. In the sorting device according to claim 3, The air discharge portion of the blower is oriented at an acute angle with respect to a tangent line set at the boundary between the first quadrant and the fourth quadrant of the orthogonal coordinate system, and is disposed with a predetermined horizontal gap between the air discharge portion and the first rotating portion of the conveyor belt. A sorting device characterized by:

5. A sorting apparatus according to any one of claims 1 to 4, The conveyor belt is configured such that a plurality of conveyors are arranged in succession and the speeds of the conveyor belt are made different. A sorting device characterized by:

6. A sorting device according to any one of claims 1 to 5, which sorts wood chips from among sorting objects; A drying device for drying the selected wood chips; Equipped with a drying system.

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