WO2012137433A1 - 光学式選別機 - Google Patents
光学式選別機 Download PDFInfo
- Publication number
- WO2012137433A1 WO2012137433A1 PCT/JP2012/001997 JP2012001997W WO2012137433A1 WO 2012137433 A1 WO2012137433 A1 WO 2012137433A1 JP 2012001997 W JP2012001997 W JP 2012001997W WO 2012137433 A1 WO2012137433 A1 WO 2012137433A1
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- Prior art keywords
- discharge path
- optical
- sorted
- granular material
- discharge
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
- B07C5/3425—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/363—Sorting apparatus characterised by the means used for distribution by means of air
- B07C5/367—Sorting apparatus characterised by the means used for distribution by means of air using a plurality of separation means
- B07C5/368—Sorting apparatus characterised by the means used for distribution by means of air using a plurality of separation means actuated independently
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C2501/00—Sorting according to a characteristic or feature of the articles or material to be sorted
- B07C2501/0018—Sorting the articles during free fall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/363—Sorting apparatus characterised by the means used for distribution by means of air
- B07C5/365—Sorting apparatus characterised by the means used for distribution by means of air using a single separation means
- B07C5/366—Sorting apparatus characterised by the means used for distribution by means of air using a single separation means during free fall of the articles
Definitions
- the present invention relates to an optical sorter that sorts granular materials such as grains and resin pellets based on colors and the like.
- raw materials consisting of grains such as rice, wheat, beans and nuts, resin pieces such as pellets and beads, fine articles such as pharmaceuticals, ores, and shirasu, and other granular materials are sorted into good and defective products.
- resin pieces such as pellets and beads
- fine articles such as pharmaceuticals, ores, and shirasu, and other granular materials are sorted into good and defective products.
- optical sorter that eliminates foreign matters and the like mixed in raw materials.
- This type of optical sorter irradiates the granular material falling along a predetermined trajectory from the end of the transfer path, receives light reflected from the granular material, and the like, and is contained in the raw material.
- the particulate matter is selected by detecting the detected defective product, foreign matter, or the like.
- the particulate matter selected as a non-defective product in the secondary sorting unit 103b is sent to the second elevator 105b through the passage 104b, sent to the primary tank 121a by the second elevator 105b, and again the primary sorting.
- the product is sorted into a non-defective product and a defective product.
- the optical sorter described in Patent Document 1 requires two sets of sorting sections, there is a problem that the apparatus becomes large and the cost increases. Moreover, the optical sorter described in the above-mentioned Patent Document 1 is a mixture of defective products sent to the secondary tank 121b with many non-defective products caught in air for eliminating the defective products. There is a limit to the processing capacity of the secondary sorting unit, and there is a problem that the non-defective product cannot be efficiently collected.
- the optical sorter of the present invention includes a granular material supply unit having a storage means for storing a material to be selected, a transfer means for transferring the material to be selected from the storage means, and the transfer means.
- Optical detection means for detecting an object falling along a predetermined trajectory from an end of the object, a determination means for determining the type of the object to be selected based on a detection signal from the optical detection means, and a determination result by the determination means
- An ejector that excludes the object to be classified to a specific type based on the predetermined fall trajectory, a first discharge path provided at a fall position of the object that falls along the predetermined trajectory, the predetermined
- An optical system comprising: a second discharge path provided at a drop position of the object to be sorted excluded from the drop locus; and a discharge hopper having a third discharge path formed between the first discharge path and the second discharge path.
- a sorting unit Is characterized in further comprising a conveying means for conveying the sorted matter to the storage means in the granular object supply unit to be discharged from the third discharge passage of the discharge hopper at the university sorting unit.
- the storage unit stores a raw material supplied from outside the sorter.
- the optical sorter includes a plurality of the granular material supply unit, the optical sorting unit, and the transport unit, and a first discharge path or a second discharge path of a discharge hopper in the first optical sorting unit.
- a transporting means for transporting a material to be sorted discharged from the storage unit of the second granular material supply unit, and a material to be sorted discharged from the first discharge path or the second discharge path of the discharge hopper in the second optical sorting unit And a transporting means for transporting the product to the storage means of the first granular material supply unit, wherein the storage means of the first granular material supply unit stores the raw material supplied from outside the sorter. .
- the top of the member that partitions the first discharge path and the third discharge path in the discharge hopper, and the top of the member that partitions the third discharge path and the second discharge path It is preferable to provide an angle adjustment plate for adjusting the amount of penetration into the discharge path.
- the particulate matter discharged from the third discharge passage is referred to as “intermediate product”.
- the classification of the part to be sorted in the present invention includes, for example, raw material non-defective products and defective products, raw materials and foreign matters mixed therein, and types of granular materials when a plurality of types of granular materials are mixed in the raw materials. It is.
- the discharge hopper in the optical sorting unit is excluded from the first discharge path provided at the dropping position of the sorting object falling along the predetermined trajectory and the predetermined dropping trajectory. Since it has the 3rd discharge way formed between the 2nd discharge way provided in the fall position of a thing, it is caught when removing a to-be-sorted object from a predetermined fall locus, and a fall locus is changed slightly
- the object to be sorted can be discharged as an intermediate product from the third discharge path of the discharge hopper.
- the optical sorter includes a transport unit that transports the material to be sorted discharged from the third discharge path of the discharge hopper to the storage unit in the granular material supply unit, and thus excludes the material to be sorted.
- the intermediate product that has been caught can be sorted again by the optical sorting unit. Therefore, according to the optical sorter of the present invention, for example, when the raw material is sorted into a non-defective product and a defective product, the non-defective product mixing rate is higher than that of the defective product discharged from the first discharge path or the second discharge path. Since the remarkably high intermediate product can be sorted again by the optical sorting unit, the recovery rate of non-defective products can be improved without increasing the size of the apparatus as compared with the prior art.
- the amount of objects to be sorted sorted into defective products transported to the storage means of the second granular material supply unit is reduced, resulting in a surplus in processing capacity of the second optical sorting unit.
- Increasing the supply amount of objects to be sorted in one optical sorting section Since it can be recovered efficiently good.
- FIG. 1 is a side sectional view showing a simplified internal structure of an optical sorter according to an embodiment of the present invention.
- the optical sorting machine in the present embodiment includes a granular material supply unit 2, an optical sorting unit 3, a bowl-shaped passage 4, and an elevator 5.
- the granular material supply unit 2 includes a raw material tank 21, a vibration feeder 22 that supplies granular material stored in the raw material tank 21, and a granular material that is supplied from the vibration feeder 22.
- An inclined chute 23 having a predetermined width for allowing an object to flow down is provided.
- the optical detection devices 31a and 31b can deal with particulate matter discharged into the air in a state of spreading in the width direction from the lower end of the inclined chute 23, and include a line sensor such as a CCD or an area sensor.
- Imaging means 311a, 311b such as a CCD camera that can receive light in a wavelength region such as NIR (near infrared), visible light, or ultraviolet light, and a fluorescent lamp that illuminates a detection position O on a predetermined fall locus of the granular material
- illuminating means 312a and 312b such as a halogen lamp and an LED light source, and backgrounds 313a and 313b. Then, the optical detection devices 31a and 31b image the granular material with the backgrounds 313a and 313b in the background by the imaging means 311a and 311b at the detection position O.
- the ejector 34 can deal with particulate matter discharged into the air in a state of spreading in the width direction from the lower end of the inclined chute 23, and is formed in the width direction.
- a nozzle 341 capable of selectively ejecting air from a plurality of nozzle holes. Then, the ejector 34 ejects air at a predetermined timing from a predetermined nozzle hole on the basis of the defective product rejection signal sent from the determination device 33, and excludes the defective product from a predetermined fall trajectory. Sort the granular materials into non-defective and defective products.
- the discharge hopper 35 includes a third discharge path 353 between the first discharge path 351 and the second discharge path 352.
- the granular material discharged from the third discharge path 353 is referred to as “intermediate product”.
- the optical sorter uses the bowl-shaped passage 4 for sending the intermediate product discharged from the third discharge path 353 and the intermediate product sent through the bowl-shaped passage 4 again to the raw material tank.
- Elevator 5 composed of a bucket conveyor or the like to be sent to 21 is provided.
- the granular material supplied to the raw material tank 21 of the granular material supply unit 2 is sent to the inclined chute 23 via the vibration feeder 22, and the inclined chute After the natural flow 23 continuously spread in a state of spreading in the width direction, it is discharged into the air along a predetermined fall trajectory from its lower end.
- the particulate matter released into the air is imaged at the detection position O on the fall trajectory in the optical sorting unit 3 by the imaging means 311a and 311b in the pair of optical detection devices 31a and 31b.
- the granular material is rejected from the predetermined drop trajectory by air injection in the ejector 34, and sorted into non-defective products and defective products, Separately, it is discharged from the first discharge path 351 and the second discharge path 352.
- the discharge hopper 35 in the present embodiment is the first discharge path. Since the third discharge passage 353 is provided between the first discharge passage 351 and the second discharge passage 352, the particulate matter containing a large amount of non-defective products caught in the air is discharged from the third discharge rod 353 as an intermediate product.
- the intermediate product discharged from the third discharge basket 353 is sent to the elevator 5 through the bowl-shaped passage 4 and is sent to the raw material tank 21 by the elevator 5, and again in the optical sorting unit 3 as a non-defective product. Sorted into defective products.
- FIG. 2 is an explanatory diagram when the granular material is sorted into a non-defective product and a defective product in the optical sorting machine according to the present embodiment.
- the particulate matter that flows down the inclined chute 23 and is released into the air from the lower end thereof is discriminated as a non-defective product or a defective product in the discriminating device of the optical sorting unit.
- the particulate matter determined to be non-defective falls to the first discharge path 351 along a predetermined fall trajectory.
- the particulate matter discriminated as a defective product by the discriminating device is excluded from the predetermined drop trajectory by the air jetted from the nozzle 341 of the ejector.
- a part of the existing non-defective product is entrained, and the falling locus of the non-defective product is slightly changed.
- the discharge hopper 35 includes the third discharge path 353, most of the non-defective products that are caught in the air and slightly changed in the fall trajectory are obtained. As an intermediate product, the product is discharged separately from the defective product excluded by the air.
- the discharge hopper 35 in the present embodiment includes a first adjustment plate 355 and a second discharge path at the top of a partition member that partitions the first discharge path 351 and the third discharge path 353.
- a second adjustment plate 356 is provided at the top of the partition member that partitions 352 and the third discharge path 353 so that the angle can be changed manually or automatically.
- the angle of each of the adjustment plates 355 and 356 can be automatically adjusted by automatically measuring the mixing ratio of defective products in the non-defective product and the intermediate product with a known measuring instrument.
- the angle of the second adjustment plate 356 is desirably set so that the mixing rate of defective products in the intermediate product is equal to or less than the mixing rate of defective products in the raw material during operation of the optical sorter. Further, when the operation of the optical sorter is finished, the particulate matter in the sorter can be prevented from remaining by closing the upper opening of the third discharge path with the second adjustment plate 356.
- the optical sorter in the present embodiment can improve the collection rate of non-defective products without increasing the size of the apparatus as compared with the prior art.
- FIG. 4 is an explanatory diagram of a procedure for sorting non-defective products and defective products in an optical sorter according to another embodiment of the present invention.
- the optical sorter in the present embodiment has two sets of granular material supply units and an optical sorting unit arranged in parallel, and sorts granular materials as raw materials into non-defective products and defective products in two stages.
- the optical sorter in the present embodiment includes a granular material supply unit, an optical sorting unit, a bowl-shaped passage, and an elevator having the same structure as that shown in FIG.
- the granular material supplied to the primary tank 21a is sorted into a non-defective product and a defective product in the primary sorting unit 3a.
- the granular material sorted into defective products by the primary sorting unit 3a is sent to the secondary tank 21b, and then sorted into non-defective products and defective products by the secondary sorting unit 3b.
- the granular material sorted into the non-defective product in the secondary sorting unit 3b is sent to the primary tank 21a, and again sorted into the non-defective product and the defective product in the primary sorting unit 3a.
- the optical sorter in the present embodiment has a reduced amount of granular materials sorted into defective products to be sent to the secondary tank 21b as compared with the conventional optical sorter shown in FIG.
- the supply amount of the particulate matter to the primary sorting unit 3a can be increased, and the non-defective product can be efficiently recovered.
- the optical sorter in the present embodiment has two sets of granular material supply unit and optical sorter arranged side by side in one optical sorter, but two independent optical sorters. And the granular material as the raw material may be sorted into a non-defective product and a defective product in two stages.
- FIG. 5 is an explanatory diagram of a procedure for sorting non-defective products and defective products in an optical sorter according to still another embodiment of the present invention.
- the optical sorter in the present embodiment has three sets of granule supply parts and an optical sorter arranged in parallel, or by connecting three independent optical sorters, and the granular material as a raw material is divided into three stages. The product is sorted into non-defective and defective products.
- the optical sorter in the present embodiment also has the same structure as that shown in FIG. 1 for the granular material supply unit, the optical sorter, the bowl-shaped passage, and the elevator.
- the optical sorter of the present invention has four or more sets of granular substance supply units and optical sorter units arranged in parallel, or four or more independent optical sorters are connected, and the granular material as a raw material is four or more stages. It can also be classified into non-defective products and defective products. ⁇ Other embodiments>
- the optical sorter has been described as excluding defective products by the ejector, but non-defective products may be excluded.
- the sorting efficiency is improved if the one with a smaller mixing ratio in the raw material is excluded in each stage.
- the granular material supply unit 2 includes the inclined chute 23, and the granular material discharged into the air from the lower end of the inclined chute 23 is detected at the detection position O by the optical detection device.
- the image is picked up by the image pickup means 311a and 311b in 31a and 31b, it is also possible to pick up an image of the granular material released into the air from the conveyor end portion arranged horizontally.
- the optical sorter of each of the above embodiments uses a nozzle that injects air as an ejector, and removes particulate matter from a predetermined drop locus in a non-contact manner. It is good also as what excludes a granular material using mechanical means, such as a leaf
- the intermediate product discharged from the third discharge path 353 is sent to the elevator 5 by various conveyors such as a horizontal conveyor and a vibration conveyor instead of the bowl-shaped path 4. Also good. Moreover, it is good also as arrange
- the optical sorter sorts the granular material as a non-defective product and a defective product.
- the raw materials and foreign materials are sorted,
- the granular materials can be sorted into one type and other types.
- optical sorter of the present invention is not limited to the above embodiment, and it goes without saying that its configuration can be changed as appropriate without departing from the scope of the present invention.
- the optical sorter of the present invention can improve the recovery rate of non-defective products without increasing the size of the apparatus, and is extremely useful.
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Abstract
Description
特許文献1に記載された光学式選別機において、1次タンク121aに供給される粒状物からなる原料は、1次選別部103aにおいて良品と不良品に選別される。前記1次選別部103aにおいて不良品に選別された粒状物は、通路104aを通して第1昇降機105aに送られ、該第1昇降機105aにより2次タンク121bに送られた後に、2次選別部103bにおいて良品と不良品に選別される。そして、2次選別部103bにおいて良品に選別された粒状物は、通路104bを通して第2昇降機105bに送られ、該第2昇降機105bにより前記1次タンク121aに送られて、再度、前記1次選別部103aにおいて良品と不良品に選別される。
また、上記特許文献1に記載された光学式選別機は、前記2次タンク121bに送られる不良品に、当該不良品を排除するためのエアに巻き込まれた良品が多く混入するものであるが、2次選別部の処理能力には限界があり、前記良品を効率よく回収することができないという問題がある。
また、本発明は、良品を効率よく回収することができる光学式選別機を提供することを目的とする。
また、本発明の光学式選別機は、前記貯留手段が、選別機外から供給される原料を貯留することが好ましい。
また、本発明における被選別部の種別には、例えば、原料の良品と不良品、原料とそれに混入する異物、複数種類の粒状物が原料に混在する場合にはそれら粒状物の種類等が含まれる。
そして、本発明の光学式選別機は、前記排出ホッパの第3排出路から排出される被選別物を前記粒状物供給部における貯留手段に搬送する搬送手段を備えるから、前記被選別物を排除する際に巻き込まれた中間品を、再度、光学選別部において選別することが可能となる。
したがって、本発明の光学式選別機によれば、例えば、原料を良品と不良品に選別する場合、前記第1排出路又は第2排出路から排出される不良品に比べ、良品の混入率が著しく高い前記中間品を、再度、光学選別部において選別することが可能なため、従来に比べ、装置を大型化することなく、良品の回収率を向上させることができる。
図1は、本発明の実施の形態における光学式選別機の内部構造を簡略化した側断面図を示す。
本実施の形態における光学式選別機は、粒状物供給部2、光学選別部3、樋状通路4及び昇降機5を備える。
そして、当該光学検出装置31a,31bは、前記検出位置Oにおいて前記撮像手段311a,311bにより前記バックグラウンド313a,313bを背景として粒状物を撮像する。
そして、当該判別装置33は、前記光学検出装置31a,31bから送られる粒状物の撮像信号に基づいて当該粒状物を良品と不良品のいずれかに判別する。
そして、当該エジェクター34は、前記判別装置33から送られる不良品の排除信号に基づいて、所定のノズル孔から所定のタイミングでエアを噴射し、所定の落下軌跡から当該不良品を排除することで、粒状物を良品と不良品に選別する。
ここで、本発明において、前記第3排出路353から排出される粒状物を「中間品」と呼ぶこととする。
本実施の形態における光学式選別機において、傾斜状シュート23を流下し、その下端から空中に放出される粒状物は、光学選別部の判別装置において良品と不良品のいずれかに判別されるが、ここで良品と判別された粒状物は所定の落下軌跡に沿って第1排出路351に落下する。
一方、前記判別装置において不良品と判別された粒状物は、エジェクターのノズル341から噴射されるエアにより前記所定の落下軌跡から排除されるが、このとき、前記排除される不良品の前後左右に存在する良品の一部が巻き込まれ、該良品の落下軌跡が僅かに変更される。
当該各調整板355,356の角度は、良品や中間品における不良品の混入率を周知の計測器により自動計測することで、自動で調整することができる。
また、前記第2調整板356の角度を変更することで、第3排出路353に侵入する中間品における不良品の混入率を調整することができる。
また、当該光学式選別機の稼働を終了する場合、前記第2調整板356により第3排出路の上部開口を塞ぐことで、選別機中の粒状物の残留を防止できる。
本実施の形態の光学式選別機において、原料タンク21に供給される粒状物は、光学選別部3において良品と不良品に選別される。その際、前記光学選別部3において良品を多く含む中間品が発生するが、当該中間品は樋状通路4を通して昇降機5に送られ、該昇降機5により原料タンク21に送られて、再度、前記光学選別部3において良品と不良品に選別される。
図4は、本発明の他の実施の形態における光学式選別機において、良品と不良品を選別する手順の説明図を示す。
本実施の形態における光学式選別機は、二組の粒状物供給部及び光学選別部を並設し、原料となる粒状物を二段階で良品と不良品に選別するものである。
本実施の形態における光学式選別機は、図1に示すものと同じ構造の粒状物供給部、光学選別部、樋状通路及び昇降機を備える。
また、前記2次選別部3bで発生する中間品は、前記2次タンク21bに送られ、再度、2次選別部3bにおいて良品と不良品に選別される。
図5は、本発明のさらに他の実施の形態における光学式選別機において、良品と不良品を選別する手順の説明図を示す。
本実施の形態における光学式選別機は、三組の粒状物供給部及び光学選別部を並設し、又は独立した三台の光学式選別機を連結し、原料となる粒状物を三段階で良品と不良品に選別するものである。
本実施の形態における光学式選別機も、粒状物供給部、光学選別部、樋状通路及び昇降機の構造は、図1に示すものと同様である。
<その他の実施の形態>
2 粒状物供給部
21 原料タンク
22 振動フィーダ
23 シュート
3 光学選別部
31a,31b 光学検出装置
311a,311b 撮像手段
312a,312b 照明手段
313a,313b バックグラウンド
33 判別装置
34 エジェクター
35 排出ホッパ
351 第1排出路
352 第2排出路
353 第3排出路
355 第1調整板
356 第2調整板
4 樋状通路
5 昇降機
Claims (4)
- 被選別物を貯留する貯留手段、該貯留手段から前記被選別物を移送する移送手段、を有する粒状物供給部と、
前記移送手段の端部から所定の軌跡に沿って落下する被選別物を検出する光学検出手段、該光学検出手段による検出信号に基づいて前記被選別物の種別を判別する判別手段、該判別手段による判別結果に基づいて特定の種別に判別される被選別物を前記所定の落下軌跡から排除するエジェクター、前記所定の軌跡に沿って落下する被選別物の落下位置に設けられる第1排出路、前記所定の落下軌跡から排除される被選別物の落下位置に設けられる第2排出路、及び前記第1排出路及び前記第2排出路の間に形成される第3排出路を有する排出ホッパ、を備える光学選別部と、
前記光学選別部における前記排出ホッパの第3排出路から排出される被選別物を前記粒状物供給部における貯留手段に搬送する搬送手段と、
を備えることを特徴とする光学式選別機。 - 前記貯留手段は、選別機外から供給される原料を貯留する請求項1記載の光学式選別機。
- 前記粒状物供給部と、前記光学選別部と、前記搬送手段とをそれぞれ複数備え、
第1の光学選別部における排出ホッパの第1排出路又は第2排出路から排出される被選別物を第2の粒状物供給部の貯留手段に搬送する搬送手段と、
第2の光学選別部における排出ホッパの第1排出路又は第2排出路から排出される被選別物を第1の粒状物供給部の貯留手段に搬送する搬送手段と、をさらに備え、
前記第1の粒状物供給部の貯留手段は、選別機外から供給される原料を貯留する請求項1記載の光学式選別機。 - 前記排出ホッパにおける第1排出路と第3排出路を仕切る部材の頂部、及び第3排出路と第2排出路を仕切る部材の頂部に、被選別物の各排出路への侵入量を調整する角度調整板を設ける請求項1乃至3のいずれか一項記載の光学式選別機。
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