JP2018111059A - Sorting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sorting device reducing variation in falling of an object to be sorted in an X-axis direction.SOLUTION: A sorting device sorts out objects 8 to be sorted where specific material kind objects 8a and the other material kind objects 8b are mixed, into the specific material kind objects and the other material kind objects while falling the objects to be sorted in a vertical direction. The device includes: a supply part 9 supplying the objects to be sorted and falling the objects to be sorted along a falling straight line 30 in a vertical direction; two airflow supply plates 3A, 3B supplying symmetric air currents having equal distance to the falling straight line of the objects to be sorted and facing each other; a falling path part 1 comprising regions inside the two air-current supply plates facing each other; a lid 4 closing an upper end part of the falling path part; an identification part 11 disposed toward the falling straight line of the objects to be sorted and identifying the composition of the falling objects to be sorted; a plurality of injection parts 14 disposed toward the falling straight line and injecting pulse air; and a control part 13 sending signals to the injection parts to control injection from the injection parts on the basis of information identified by the identification part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sorting apparatus for sorting small pieces made of a specific material type from a sorting target in which a plurality of small pieces are collected.

  2. Description of the Related Art In recent years, many sorters in the world have used sorting devices that sort specific materials and other materials from a large amount of materials. For example, in the field of home appliance recycling, mixed plastics that are mixed with plastics of various types including at least a specific type of material that are generated from household appliances that are crushed unnecessary are detected by the identification device, and the air nozzle Separation and collection are performed by selectively blowing pulsed air for each grade.

  As a conventional sorting apparatus, there is, for example, Patent Document 1. FIG. 4 is a diagram showing a conventional sorting device described in Patent Document 1. As shown in FIG.

  In FIG. 4, the conveyor 101 conveys the sorting object 102 placed on the conveyor 101 and containing foreign substances in the material in one conveyance direction. The sorting object 102 that has reached the conveyor tip 103 in the conveying direction of the conveyor 101 is projected in the x direction and collides with the collision surface 104. After the collision, the sorting object 102 falls into the passage 105 vertically downward. A foreign object detection device 106 is arranged at a lower portion of the passage 105 in a direction perpendicular to the fall of the sorting object 102, and the detection device 106 falls into the inspection area of the detection device 106 in the passage 105. It is detected whether 102 is a foreign object. After the detection, the selection object 102 continues to fall, and pulse air is blown to the object detected by the air nozzle 107 arranged at the lower end of the passage 105 in the direction perpendicular to the drop of the selection object 102. Then, the fall trajectory falls to the separation shaft 108, and other than foreign matters fall to the descending shaft 109 as they are, and each is separated and recovered and sorted.

  The sorting object 102 projected from the conveyor tip 103 and collided with the collision surface 104 is accelerated and dropped by the attractive force of the earth. However, the sorting object 102 receives a head wind opposite to the falling speed at the same speed, and the shape of the sorting object 102 is reduced. Depending on the area or weight, air resistance will be received. Due to this air resistance force, the dropping paths of the selection objects 102 are different from each other, so that there is a drop variation, and the drop accuracy at the position where the pulse air from the air nozzle 107 is received is lowered.

  Therefore, in the conventional example, in order that each of the selection targets 102 does not cause variations based on different air resistances, the air flow in the passage 105 is substantially the same speed as the selection target 102 that falls, as follows. The air resistance of the selection object 102 is reduced by performing airflow control.

First, an air flow is sucked from above the passage 105 or discharged from below, thereby generating a vertically downward air flow from the top to the bottom in the passage 105. Further, in order to generate an air flow having the same velocity distribution as the vertical downward velocity distribution of the selection target 102 that is falling while accelerating due to the earth's attractive force, the width of the walls 110 and 111 forming the passage 105 is the square root of the fall depth. The shape of the wall 111 is created so that the function depends on the width of the passage 105 so that the width of the passage 105 gradually decreases from the upper side to the lower side. As a result, the vertically downward velocity of the air flow is accelerated as it goes downward, and becomes equal to the vertically downward velocity distribution of the sorting object 102, and the air resistance that the sorting object 102 receives during dropping becomes zero.
With this action, the air resistance is not received in the drop passage 105 regardless of the shape, area, or weight of the selection object 102, and thus the variation in the drop of the selection object 102 can be suppressed.

JP 2005-305430 A

However, in the conventional configuration, the selection object 102 that is conveyed by the conveyor 101 and projected in the conveyance direction has a speed in the x-axis direction, and is opposite to the conveyance direction of the conveyor 101 after colliding with the collision surface 104. The passage 105 is dropped while maintaining the velocity in the x-axis direction. Therefore, even if the air flow is generated, the air resistance in the dropping direction of the sorting object 102 is eliminated, and the variation in dropping generated during the dropping is reduced, the x-axis direction generated when the sorting object 102 is supplied to the passage 105 is generated. Variations cannot be reduced.
As described above, the variation in the x-axis direction of the selection target 102 that occurs when the selection target 102 is supplied to the passage 105 reduces the accuracy of the selection due to the pulse air ejection from the nozzle 107 at the lower end of the passage 105. The conventional example had.
SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a sorting device that can reduce the variation in the fall of the sorting target in the x-axis direction.

In order to achieve the above object, a sorting apparatus according to one aspect of the present invention includes:
A sorting device that sorts the specific material type and the other material type while dropping a selection target in which the specific material type and the other material type are mixed in a vertical direction,
A supply unit for supplying the sorting object and dropping the sorting object along the vertical drop line;
Two airflow supply plates for supplying symmetrical airflows facing each other at an equal distance with respect to the falling straight line to be selected;
A drop path portion configured by a region inside the two air flow supply plates facing each other;
A lid that covers the upper end of the drop path section;
An identification unit that is arranged toward the drop line of the sorting object and identifies the composition of the sorting object that is falling;
A plurality of jetting units arranged toward the falling straight line and jetting pulsed air;
And a control unit that controls the injection of the injection unit by sending a signal to the injection unit based on the information identified by the identification unit.

  As described above, the sorting apparatus according to the aspect of the present invention blows air from two directions by the two air flow supply plates so as to sandwich the sorting object perpendicularly to the falling sorting object, and the air is blown downward. And generating a downward air flow to increase the wind speed along the falling path to be sorted. According to such a sorting apparatus, it is possible to reduce the variation in dropping that occurs during material supply in a direction perpendicular to the falling direction that could not be controlled so far, and the shape, area, or Regardless of the weight, it is possible to select the specific material type and the other material type in the selection target with high accuracy.

1 is a schematic configuration diagram of a sorting device according to Embodiment 1 of the present invention. Schematic configuration diagram of a sorting apparatus according to Embodiment 2 of the present invention Schematic configuration diagram of a sorting apparatus in Embodiment 3 of the present invention Schematic configuration diagram of a conventional sorting device described in Patent Document 1

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a sorting apparatus according to an embodiment of the present invention.
The sorting device includes a supply unit 9, two airflow supply plates 3 </ b> A and 3 </ b> B, a drop path unit 1, a lid 4, an identification unit 11, a plurality of injection units 14, and a control unit 13. Has been.
The supply unit 9 is a material supply unit that supplies the selection target 8 into the drop path unit 1 and drops the selection target 8 along a vertical drop straight line (that is, a straight line indicated by a one-dot chain line 30).
The drop path portion 1 is configured by a region inside the two opposing rectangular airflow supply plates 3A and 3B, for example. The two air flow supply plates 3 </ b> A and 3 </ b> B supply symmetrical air currents that are opposed to each other at equal distances to the drop straight line 30 in the drop path part 1 of the sorting object 8 supplied from the supply part 9. To do.
The lid 4 closes the upper end portion of the drop path portion 1.
The identification unit 11 is arranged toward the drop line 30 of the selection target 8. Specifically, in the upper part of the drop path unit 1, for example, between the air flow supply plates 3 </ b> A and 3 </ b> B on a virtual plane that intersects the drop line 30. It is arranged toward the part 6. The identification unit 11 identifies the composition of the selection target 8 that is falling in the fall path unit 1. The identification unit 11 is a device that identifies a plastic material type from reflected light when irradiated with infrared light, for example. Information identified by the identification unit 11 is sent to the control unit 13.
Each of the plurality of injection units 14 includes an air nozzle 14 as an example, and is arranged toward the drop straight line 30 of the drop path unit 1 at the lower end of the drop path unit 1, and pulsates air from the air nozzle 14 below the drop path unit 1. Inject against area.
The control unit 13 controls the injection of the injection unit 14 by sending a signal to the injection unit 14 based on the information identified by the identification unit 11.

These configurations will be described in detail below.
In FIG. 1, the drop path portion 1 is configured by a region of a rectangular parallelepiped space formed by two airflow supply plates 3 </ b> A and 3 </ b> B that face each other and a lid 4 that covers an upper end portion. The material supply port 10 of the material supply unit 9 is connected to the lid 4 as an opening at the center of the lid 4 of the dropping path unit 1. Here, although omitted in FIG. 1, the area of the rectangular parallelepiped space forming the drop path portion 1 is two plates facing both the front surface and the back surface 3C of FIG. Of the six surfaces constituting the rectangular parallelepiped space region including these two plates, the two airflow supply plates 3A and 3B, the lid 4 and the lower surface, and the y-axis positive Only one side of the direction (i.e., the bottom surface) is open. The airflow supply plates 3 </ b> A and 3 </ b> B are plates that supply airflow from the entire surface to the inside of the drop path portion 1. An air flow in the positive x-axis direction is supplied from the air flow supply plate 3A, and an air flow in the negative x-axis direction is supplied from the air flow supply plate 3B at a constant speed. The airflow supply plates 3A and 3B are provided with a plurality of airflow supply nozzle holes connected to a fluid supply device (not shown) at a plurality of positions facing each other along the X-axis direction.

  The airflows facing each other collide at the intermediate part 6 of the airflow supply plates 3A and 3B facing each other. Here, since the dropping path portion 1 is configured to open only in the downward direction, the airflow supplied in the x-axis positive direction and the x-axis negative direction, respectively, and merged at the intermediate portion 6 is the y-axis positive direction (that is, The main stream 7 in the direction of the falling straight line). The wind velocity in the positive direction of the y-axis of the main flow 7 at the intermediate portion 6 of the air flow supply plates 3A and 3B is gradually reduced while the flow rate of the main flow 7 is gradually accumulated by the flow rate of the air flow supplied from the top to the bottom. Since the cross-sectional area of the xz plane of the path portion 1 is constant from the upper end to the lower end, the wind speed of the main flow 7 gradually increases in speed.

The sorting operation of the sorting object 8 by the sorting apparatus having such a configuration is as follows.
First, the sorting object 8 falls from the material supply port 10 of the lid 4, which is the intersection of the lower end of the material supply unit 9 and the intermediate part 6 of the two air flow supply plates 3 </ b> A and 3 </ b> B constituting the drop path unit 1. Supplied.

  Subsequently, the sorting object 8 supplied to the drop path portion 1 is, immediately after dropping, on the intermediate portion 6 of the air flow supply plates 3A and 3B on the virtual plane intersecting the drop straight line 30 in the upper part of the drop path portion 1, for example. Through the window 12, the identification unit 11 disposed toward the discriminates whether it is the specific material type 8 a or the other material type 8 b.

  Subsequently, the selection target 8 continues to fall, during which the control unit 13 processes information from the identification unit 11, and is arranged at the lower end of the drop path unit 1 toward the intermediate unit 6 and ejects pulsed air 14. Send a signal to. Select according to the signal sent from the control unit 13 in accordance with the timing when the selection target 8 reaches the drop position 15 that is the intersection of the intermediate part 6 of the airflow supply plates 3A and 3B and the extended line of the air nozzle 14. Then, pulsed air is ejected from the air nozzle 14. For example, when the identification unit 11 determines that the selection target 8 is the specific material type 8a, pulse air is ejected from the air nozzle 14 to change the fall trajectory of the specific material type 8a, and the specific material type 8 Separated and recovered into one recovery box 16A. On the other hand, when the identification unit 11 determines that the selection target 8 is the other material type 8b, the second recovery for the other material type below the intermediate unit 6 is performed without ejecting the pulse air from the air nozzle 14. Drop into the box 16B and collect.

  Note that it does not matter whether the pulsed air is ejected to the specific material type 8a or the pulsed air is ejected to the other material type 8b.

In addition, in order not to disturb the flow of the main flow 7, it is preferable that the tip of the air nozzle 14 is disposed on the outer side of the downward extension line of the air flow supply plate 3A or 3B.
The falling sorting object 8 tries to fall while increasing the speed according to the following equation (1).

  Here, v is defined as the falling speed of the sorting object 8, y is the falling distance of the sorting object 8, and g is defined as gravity acceleration.

  However, the sorting object 8 receives various air resistances depending on its shape, area, or weight. For this reason, the fall of the selection object 8 causes variations in the xz plane direction or variations in the y-axis direction (that is, time variation until the hit position 15 is reached). Therefore, the main flow 7 that gradually increases in speed described above is generated, and the selection target 8 is dropped into the generated main flow 7, thereby reducing the air resistance against the drop, and the drop variation of the selection target 8 due to the air resistance. Can be suppressed.

  At the time of supply from the material supply port 10, the sorting object 8 has a speed in the x-axis direction or a positional deviation in a direction intersecting the falling straight line 30 of the sorting object 8 from the intermediate part 6 of the airflow supply plates 3A and 3B. In this case, the trajectory of the sorting object 8 cannot be returned to the intermediate portion 6 of the airflow supply plates 3A and 3B, which are the desired fall paths of the sorting object 8, only by the airflow control having the velocity distribution equivalent to the free fall. Can not. However, the airflow in the x-axis direction from the airflow supply plates 3A and 3B that generate the main flow 7 has the action of pushing back in the positive x-axis direction when the position of the selection target 8 is shifted from the intermediate part 6 in the negative x-axis direction. In the case of displacement in the positive x-axis direction, it has the action of pushing back in the negative x-axis direction. For this reason, the sorting object 8 that has been displaced is returned to the track on the intermediate portion 6, and the variation in dropping at the dropping position 15 is reduced.

  As a result of the above, the sorting object 8 starts to fall from the material supply port 10 in the drop path portion 1, but the two symmetrical airflows facing each other at an equal distance with respect to the drop straight line 30 of the sorting object 8 are two airflow supply plates. By supplying from 3A and 3B, it is possible to correct the positional deviation of the selection target 8 in the direction intersecting the drop straight line 30, and the drop variation that can occur before reaching the drop position 15 is suppressed. 15 is improved by the air nozzle 14 and the sorting accuracy is improved. In other words, the above configuration increases the wind speed along the fall path, makes it possible to prevent the selection target 8 from receiving air resistance due to the drop, and a direction perpendicular to the drop direction generated when the selection target 8 is supplied. The variation in the size of the sorting object 8 can be reduced, the accuracy of dropping the sorting object 8 can be improved, and the sorting system for the sorting object 8 can be improved.

(Embodiment 2)
FIG. 2 is a schematic diagram showing components of the sorting apparatus according to Embodiment 2 of the present invention. In FIG. 2, the same components as those in FIG.

  By dividing the air flow supply plates 3A and 3B in the first embodiment into a plurality of areas along the vertical direction (y-axis direction) according to the rules described below, the velocity distribution of the main flow 7 is selected as the selection target 8. The free fall velocity distribution can be matched, and the air resistance acting on the selection object 8 can be further reduced.

  As a premise, the flow rate q of the airflow supplied from one area is the same in all the areas, and the airflow from each of the airflow supply plates 3A and 3B is plane-symmetric in the intermediate portion 6.

  If the air resistance does not work, the sorting object 8 falls by a constant acceleration linear motion due to the gravitational acceleration g. The speed increment Δv that increases during a certain minute time interval Δt is expressed by Expression (2).

Here, since g is a constant, acceleration is performed for a certain speed at certain time intervals.

  Here, since the supply flow rate q from one zone is the same in all zones, the increment of the flow rate of the main flow 7 when the main flow 7 passes through one zone from top to bottom is equal, and xz of the fall path section 1 Since the cross-sectional area by the plane is also constant, the increase in velocity of the main flow 7 is the same before and after passing through all the zones. That is, the vertical width of the area is adjusted so that the time interval Δt from reaching a certain area to the next lower area becomes equal from the upper end to the lower end of the drop path portion 1.

As shown in FIG. 2, the nth area (n is an integer of 1 or more) counted from the top is _2n, and the y-axis direction falling distance from the material supply port 10 to the lower end of the _nth area _2n is y. _{Assuming n} , the following formula (3) is obtained.

Therefore, if the distance between the lower end of the _nth section 2 _{n and} the lower end of the n−1th section 2 _{n−1 that} is _one higher, that is, the vertical width of the section 2 _n is Δy _n , Equation (4) is obtained.

Thus, the n-th zone _{2 n} in the vertical direction of the width [Delta] y _n and n + 1 th zone _{2 n + 1} in the vertical direction of the ratio [Delta] y _{n + 1} / [Delta] y _n the following equation between the width [Delta] y _{n + 1} (5), copying to The air flow supply plates 3A and 3B are divided into a plurality of areas having different widths in the vertical direction by dividing the air flow supply plates 3A and 3B into a plurality of vertical directions.

  As a result, as the air flow supply plates 3A and 3B move from the upper side to the lower side, the vertical width of the area gradually increases, and the flow rate of the air flow per unit height from the air flow supply plates 3A and 3B gradually increases. Since the velocity distribution of the main flow 7 more closely matches the free fall velocity distribution of the sorting object 8, the air resistance received by the falling sorting object 8 can be reduced, and the drop position 15 The drop variation that can occur before reaching the position is suppressed, the precision of the drop at the air nozzle 14 at the drop position 15 is improved, and the sorting accuracy is improved.

When the distance D between the air flow supply plates 3A and 3B is greater than 0 mm and equal to or less than 10 mm, the main flow 7 is likely to be a laminar flow. In this case, the velocity gradient in the x-axis direction of the main flow 7 is high. When the position of the sorting object 8 is slightly deviated from the intermediate portion 6, the falling speed and the mainstream 7 do not coincide with each other, and air resistance may be received. In addition, the flow velocity of the supply airflow from the zone is reduced by about 100 mm from the ejection, and the action of returning the position of the selection target 8 shifted in the x-axis direction to the intermediate portion 6 is reduced. For this reason, the distance D between the airflow supply plates 3A and 3B is preferably D ≦ 200 mm.
From the above, the distance D between the airflow supply plates 3A and 3B is preferably 10 mm ≦ D ≦ 200 mm.

(Embodiment 3)
FIG. 3 is a schematic diagram showing components of the sorting apparatus according to Embodiment 3 of the present invention. 3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.
The air flow supply plates 3A and 3B in the first embodiment are divided into a plurality of zones in the vertical direction (y-axis direction), and the supply flow rate from each zone is changed for each zone according to the rules described below. Thus, the velocity distribution of the main flow 7 can be matched more closely to the velocity distribution of the free fall of the sorting object 8, and the air resistance acting on the sorting object 8 can be further reduced.
As a premise, the vertical widths of all the sections are equal, and the airflow from each of the airflow supply plates 3A and 3B is plane-symmetric in the intermediate portion 6.
Let Δy be the vertical width of one area.
If air resistance does not act on the sorting object 8, the falling speed V _n of the sorting object 8 that freely falls to the lower end of the n-th area 2 _n counted from above is expressed by the following equation (6), where g is the acceleration of gravity. It becomes.

In order to create a main flow having the same velocity as the drop velocity V _n , the flow area Q _n of the main flow at the height of the lower end of the _nth zone 2 _n is represented by A as the cross-sectional area of the drop path portion 1 by the xz plane. The following equation (7) is obtained.

Therefore, n-th zone 2 _n main 7 at the level of the lower end of the flow rate Q _n and n + 1 th zone 2 _{n + 1} main 7 at the level of the lower end of the flow rate Q _{n + 1} and the difference (n + 1) th zone of 2 _By supplying from _{n + 1} , the speed of the main stream 7 increases in the same manner as free fall. When the supply flow rate from the (n + 1) th zone 2 _{n + 1} is q _{n + 1} , the following equation (8) is obtained.

Thus, the n th and (n + 1) th zone _{2 n, 2} supply flow rate from the _{n + 1 q n} and _{q n + 1} of the ratio _{q n} + 1 / _{q n} following equation (9), copying to the supply from each of the zones Determine the flow rate.

  As a result, the supply flow rate from the area decreases from the upper side to the lower side, and the velocity distribution of the main flow 7 more closely matches the free fall velocity distribution of the selection object 8, so that the falling selection object 8 receives. The air resistance can be reduced, drop variations that can occur before reaching the drop position 15 are suppressed, the drop accuracy at the air nozzle 14 at the drop position 15 is improved, and the sorting accuracy is improved.

  When the distance D between the air flow supply plates 3A and 3B is greater than 0 mm and equal to or less than 10 mm, the main flow 7 is likely to be a laminar flow. In this case, the velocity gradient in the x-axis direction of the main flow 7 is high. When the position of the sorting object 8 is slightly deviated from the intermediate portion 6, the falling speed and the mainstream 7 do not coincide with each other, and air resistance may be received. In addition, the flow velocity of the supply airflow from the zone is reduced by about 100 mm from the ejection, and the action of returning the position of the selection target 8 shifted in the x-axis direction to the intermediate portion 6 is reduced. For this reason, the distance D between the airflow supply plates 3A and 3B is preferably D ≦ 200 mm.

  From the above, the distance D between the airflow supply plates 3A and 3B is preferably 10 mm ≦ D ≦ 200 mm.

According to the configuration of the first to third embodiments, air is blown from two directions of the two air flow supply plates 3A and 3B so as to sandwich the sorting object 8 perpendicularly to the falling sorting object 8, and the blowing is performed. By discharging downward, a downward air flow (that is, the main flow 7) can be generated, and the wind speed can be increased along the falling path of the selection target 8. If constituted in this way, it is possible to reduce the variation in the drop that occurs at the time of supplying the material due to the positional deviation in the direction perpendicular to the drop direction that could not be controlled so far, Regardless of the area or weight, the specific material type 8a and the other material type 8b in the selection object 8 can be selected with high accuracy.
In addition, it can be made to show the effect which each has by combining arbitrary embodiment or modification of the said various embodiment or modification suitably. In addition, combinations of the embodiments, combinations of the examples, or combinations of the embodiments and examples are possible, and combinations of features in different embodiments or examples are also possible.

  The sorting device according to the above aspect of the present invention can reduce the variation in the sorting target in the x-axis direction, and sorts a small piece of a specific material type with high accuracy from a sorting target in which a plurality of small pieces are gathered. The present invention can be applied to the purpose of separating and collecting plastics of a specific material type from a mixed plastic in which a plurality of types of plastics including a specific material type are mixed, or removing foreign substances from a large amount of food or grain.

DESCRIPTION OF SYMBOLS 1 Drop path part 2 ₁ , 2 ₂ , 2 _n-1 , 2 _n , 2 _{n + 1} area 3A, 3B Air flow supply plate 3C Surface in the back direction of the paper 4 Lid 6 Middle part 7 Main flow 8 Sorting object 8a Specific material type 8b etc. Grade 9 Material supply unit 10 Material supply port 11 Identification unit 12 Window 13 Control unit 14 Air nozzle 15 Dropping position 16A, 16B Recovery box 30 Drop straight line

Claims (5)

A sorting device that sorts the specific material type and the other material type while dropping a selection target in which the specific material type and the other material type are mixed in a vertical direction,
A supply unit for supplying the sorting object and dropping the sorting object along the vertical drop line;
Two airflow supply plates for supplying symmetrical airflows facing each other at an equal distance with respect to the falling straight line to be selected;
A drop path portion configured by a region inside the two air flow supply plates facing each other;
A lid that covers the upper end of the drop path section;
An identification unit that is arranged toward the drop line of the sorting object and identifies the composition of the sorting object that is falling;
A plurality of jetting units arranged toward the falling straight line and jetting pulsed air;
A sorting apparatus including a control unit that controls the injection of the injection unit by sending a signal to the injection unit based on the information identified by the identification unit. The airflow supply plate is divided into a plurality of areas in the vertical direction,
When the vertical width of the _nth area counted from the top of the drop path part is Δyn,
The ratio with the width Δy _{n + 1} of the (n + 1) th area is _expressed by the following equation:

The sorting apparatus according to claim 1, wherein the flow rate of the airflow supplied from all areas is equal.   3. The sorting apparatus according to claim 2, wherein when a distance between the two airflow supply plates facing each other forming the drop path portion is defined as D, 10 mm ≦ D ≦ 200 mm. The airflow supply plate is divided into a plurality of areas in the vertical direction,
When the supply flow rate from the n-th zone as counted from the top of the dropping path unit is defined as q _n, the ratio of the supply flow rate q _{n + 1} of the (n + 1) th area, the following equation

The sorting device according to claim 1, wherein the vertical widths of the sections are all the same.   The sorting device according to claim 4, wherein when a distance between the two airflow supply plates facing each other forming the drop path portion is defined as D, 10 mm ≦ D ≦ 200 mm.

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