WO2021100372A1 - 光学式選別機 - Google Patents
光学式選別機 Download PDFInfo
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- WO2021100372A1 WO2021100372A1 PCT/JP2020/038906 JP2020038906W WO2021100372A1 WO 2021100372 A1 WO2021100372 A1 WO 2021100372A1 JP 2020038906 W JP2020038906 W JP 2020038906W WO 2021100372 A1 WO2021100372 A1 WO 2021100372A1
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- Prior art keywords
- chute
- sorted
- optical
- surface side
- slit
- Prior art date
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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
- B07C5/365—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G11/00—Chutes
Definitions
- the present invention relates to an optical sorter that sorts granules such as grains and resin pellets based on color and the like.
- raw materials consisting of grains such as rice and wheat, resin pellets, coffee beans, and other granules are sorted into non-defective products and defective products based on color, etc., and foreign substances mixed in the raw materials are removed based on color, etc.
- optical sorters that do.
- the optical sorter described in Patent Documents 1 and 2 is provided with a slanted chute, and irradiates light from a light source on particles that fall in a certain trajectory from the lower end of the chute.
- the optical sorter receives reflected light or transmitted light from a granular material with a sensor to detect defective products, foreign substances, and the like.
- the optical sorter sorts the detected defective products, foreign substances, etc. by blowing them off with an ejector.
- the optical sorter In the optical sorter, some of the granules that fall from the lower end of the chute deviate from a certain fall trajectory due to differences in shape and size, differences in flight attitude in the air, and the like. In this case, the optical sorter cannot accurately detect defective products, foreign substances, etc., and has a problem of affecting the sorting performance.
- an object of the present invention is to provide an optical sorter capable of accurately detecting defective products, foreign substances, etc. of the object to be sorted and improving sorting performance.
- one embodiment of the present invention is: A chute placed at an angle to allow the object to be sorted to flow down, An optical detection unit that detects the object to be sorted at the detection position, An optical sorter including an ejector section that sorts and removes objects to be sorted based on the detection result by the optical detection section.
- the optical detector The lighting unit that illuminates the detection position and
- an optical sorter including an imaging unit that images an object to be sorted at a detection position,
- the chute is provided with a slit for optical detection perpendicular to the flow direction of the object to be sorted.
- the optical detection unit is characterized in that the image pickup unit captures an object to be sorted flowing down the chute, with the position where the optical detection slit is provided as the detection position.
- a pair of optical detection units are provided on the upper surface side and the lower surface side of the chute, and the object to be sorted flowing down on the chute is imaged from the upper surface side and the lower surface side of the chute.
- the chute is provided with a slit for sorting and removing on the downstream side of the slit for optical detection at right angles to the flow direction of the object to be sorted. It is preferable that the ejector portion sorts and removes the object to be sorted flowing down on the chute to the upper surface side or the lower surface side of the chute through the sorting and removing slit.
- An ejector portion is provided on the lower surface side of the chute, and the object to be sorted flowing down on the chute can be removed by blowing air toward the upper surface side of the chute or sucking it to the lower surface side of the chute through a slit for sorting and removing. preferable.
- the ejector portion is provided on the upper surface side of the chute, and the object to be sorted flowing down on the chute can be removed by sucking it to the upper surface side of the chute or blowing it to the lower surface side of the chute through the slit for sorting and removing. preferable.
- the ejector section In addition, it is equipped with a discharge hopper that discharges the items to be sorted by the ejector section separately.
- the chute is arranged so that its lower end extends into the first discharge portion of the discharge hopper and the sorting / removing slit is located above the first discharge portion. It is preferable that the ejector portion sorts and removes the object to be sorted flowing down on the chute to the second discharge portion of the discharge hopper through the slit for sorting and removing.
- the ejector portion is provided at a position facing the falling locus of the object to be sorted falling from the lower end of the chute, and the object to be sorted falling from the lower end of the chute is sorted and removed from the falling locus.
- the ejector portion is provided at a position adjacent to the lower end of the chute, and the object to be sorted falling from the lower end of the chute is sorted and removed to the upper surface side or the lower surface side of the chute.
- the ejector portion is provided on the lower surface side of the chute, and the object to be sorted that falls from the lower end of the chute is blown to the upper surface side of the chute or sucked to the lower surface side of the chute to remove it.
- the ejector portion is provided on the upper surface side of the chute, and the object to be sorted that falls from the lower end of the chute is removed by sucking it toward the upper surface side of the chute or blowing it toward the lower surface side of the chute.
- the imaging unit has a built-in line sensor.
- the illumination unit is an LED light source.
- the chute is provided with an optical detection slit orthogonal to the flow direction of the object to be sorted.
- the optical detection unit uses the imaging unit to take an image of the object to be sorted flowing down the chute, with the position where the optical detection slit is provided as the detection position. Therefore, unlike the case of detecting the object to be sorted while falling from the lower end of the chute as in the conventional optical sorter, it is possible to detect the object to be sorted that always flows down on the chute with a constant trajectory.
- the width of the optical detection slit 31 provided in the chute 3 shall be set in consideration of the size of the sensor element, the amount of light received by the sensor, the inclination angle of the chute, the weight and size of the granules flowing down on the chute, and the like. Can be done.
- the width of the optical detection slit 31 can be 1 to 2 mm.
- the chute is provided with a slit for sorting and removing on the downstream side of the slit for optical detection at right angles to the flow direction of the object to be sorted.
- the ejector portion sorts and removes the object to be sorted flowing down on the chute to the upper surface side or the lower surface side of the chute through the sorting / removing slit. Therefore, unlike the case where the object to be sorted while falling from the lower end of the chute is sorted and removed as in the conventional optical sorter, the object to be sorted that always flows down on the chute with a constant trajectory can be sorted and removed. it can. Therefore, according to the optical sorter according to the embodiment of the present invention, defective products, foreign substances, etc. of the object to be sorted can be sorted and removed more accurately than the conventional optical sorter. As a result, the sorting performance is further improved.
- the lower end of the chute extends into the first discharge portion of the discharge hopper.
- the sorting / removing slit is arranged so as to be located above the first discharge portion.
- the ejector section sorts and removes the object to be sorted flowing down on the chute to the second discharge section of the discharge hopper through the slit for sorting and removing. Therefore, the material to be sorted can be easily and surely sorted and discharged into the first discharge part and the second discharge part of the discharge hopper.
- the ejector portion is provided at a position facing the falling locus of the object to be sorted falling from the lower end of the chute.
- the ejector unit sorts and removes the object to be sorted that falls from the lower end of the chute from the fall locus. Therefore, unlike the conventional optical sorter, the ejector portion can be arranged near the lower end of the chute, so that the drop locus of the object to be sorted is less likely to vary at the sorting position by the ejector portion. Therefore, according to the optical sorter of the present invention, defective products, foreign substances, etc. of the object to be sorted can be sorted and removed with higher accuracy than the conventional optical sorter, so that the sorting performance can be further improved. it can.
- the ejector portion is provided at a position adjacent to the lower end of the chute, and the object to be sorted falling from the lower end of the chute is sorted and removed to the upper surface side or the lower surface side of the chute. .. Therefore, unlike the conventional optical sorter, the drop locus of the object to be sorted does not vary at the sorting position by the ejector section. Therefore, according to the optical sorter according to the embodiment of the present invention, defective products, foreign substances, etc. of the object to be sorted can be sorted and removed more accurately than the conventional optical sorter, so that the sorting performance is further improved. Can be improved.
- the width of the optical detection slit can be reduced.
- the illumination unit is an LED light source
- light is unlikely to be emitted. Therefore, even if the width of the optical detection slit is small, a sufficient amount of light can be secured at the detection position. it can.
- FIG. It is a schematic side sectional view of an optical sorter. It is the schematic explanatory drawing of the optical sorting part in Example 1.
- FIG. It is a schematic perspective view of the shoot in Example 1.
- FIG. It is explanatory drawing of the example which sorts and removes defective products by an ejector apparatus in the optical sorting part of Example 1.
- FIG. It is explanatory drawing of another example which is a modification of the optical sorting part of Example 1 and sorts and removes defective products by an ejector apparatus.
- FIG. 1 is an example of an optical sorter and shows a schematic side sectional view.
- the optical sorter 1 includes a granular material supply unit 2 that supplies particles as a raw material, a chute 3 that is arranged in an inclined manner and allows the granular material to flow down, and a granular material that flows down on the chute 3. It is provided with an optical sorting unit 4 that detects an object and sorts it into a non-defective product and a defective product based on the detection result, and a discharge hopper 5 that separates and discharges the granular material sorted by the optical sorting unit 4 into a non-defective product and a defective product.
- the granular material supply unit 2 includes a raw material tank (not shown) and a vibration feeder 21 that supplies the granular material stored in the raw material tank to the chute 3.
- the shoot 3 has a predetermined width.
- the chute 3 is arranged in an inclined state at a lower position on the tip end side of the vibration feeder 21. The chute 3 naturally causes the granules supplied from the vibration feeder 21 to flow down.
- the optical sorting unit 4 discriminates granules into non-defective products and defective products based on the imaging signals of the pair of optical detection devices 41a and 41b and the optical detection devices 41a and 41b arranged on the upper surface side and the lower surface side of the chute 3.
- the discriminant device 42 and the ejector device 43 that removes defective products based on the discriminant results of the discriminating device 42 and sorts the granular matter into non-defective products and defective products are provided.
- the discharge hopper 5 includes a non-defective product discharge path 51 and a defective product discharge path 52 that separate and discharge the granular substances selected by the ejector device 43 into non-defective products and defective products.
- the granules stored in the raw material tank of the granular material supply unit 2 are continuously supplied to the chute 3 by the vibration feeder 21.
- the granules supplied to the chute 3 continuously naturally flow down on the surface of the chute 3 in a state of spreading in the width direction.
- the granules flowing down on the chute 3 are imaged by the imaging unit of the pair of optical detection devices 41a and 41b in the optical sorting unit 4.
- the discrimination device 42 compares the signal level such as the amount of light and the color component in the image pickup signal of the image pickup unit with the threshold value. As a result, the discriminating device 42 discriminates the granular material into either a non-defective product or a defective product. Defective products are removed by injecting air in the ejector device 43 based on the removal signal sent from the discrimination device 42. As a result, the granules are sorted into non-defective products and defective products.
- the granules selected as non-defective products are discharged from the non-defective product discharge path 51 of the discharge hopper 5, and the granules selected as defective products are discharged from the defective product discharge path 52 of the discharge hopper 5.
- FIG. 2 shows a schematic explanatory view of the optical sorting unit according to the first embodiment.
- FIG. 3 shows a schematic perspective view of the chute according to the first embodiment.
- FIG. 4 is an explanatory diagram of an example in which defective products are sorted and removed by an ejector device in the optical sorting unit of the first embodiment.
- the chute 3 is provided with an optical detection slit 31 that opens continuously in the width direction of the chute 3 orthogonal to the flow direction of the granular material.
- the chute 3 is provided with a sorting / removing slit 32 that opens continuously in the width direction of the chute 3 orthogonal to the flow direction of the granular material on the downstream side of the optical detection slit 31.
- the lower end of the chute 3 extends into the non-defective product discharge path 51 of the discharge hopper 5.
- the sorting / removing slit 32 is arranged so as to be located above the non-defective product discharge path 51.
- the optical detection devices 41a and 41b have a built-in line sensor such as a CCD or an area sensor capable of dealing with granules flowing down on the chute 3 in a state of spreading in the width direction.
- the optical detection devices 41a and 41b detect on the imaging units 411a and 411b of a CCD camera or the like capable of receiving light in a wavelength range such as near infrared rays (NIR), visible light or ultraviolet rays, and on a chute 3 in which particles flow down.
- NIR near infrared rays
- It includes illumination units 412a and 412b such as an LED light source and a fluorescent lamp that illuminate the position O, and a background unit that serves as a background when the image pickup units 411a and 411b image the particles at the detection position O.
- the ejector device 43 can handle particles flowing down on the chute 3 in a state of spreading in the width direction.
- the ejector device 43 has an ejector nozzle 431 capable of selectively injecting air from a plurality of nozzle holes formed in the width direction, and an ejector nozzle 431 that injects air from the ejector nozzle 431 based on a removal signal sent from the discrimination device. Not equipped with an ejector drive.
- the optical detection devices 41a and 41b are arranged so that the position on the chute 3 where the optical detection slit 31 is provided is the detection position O.
- the optical detection devices 41a and 41b illuminate the particles flowing down on the chute 3 from the upper surface side and the lower surface side of the chute at the detection position O by the illumination units 412a and 412b, and image the particles by the imaging units 411a and 411b.
- the tip of the ejector nozzle 431 is in contact with or close to the lower surface side of the chute 3, and the plurality of nozzle holes of the ejector nozzle 431 are arranged so as to directly or indirectly communicate with the sorting / removing slit 32. It is installed.
- the ejector device 43 removes the particles that are determined to be defective among the granules flowing down on the chute 3 by injecting air to the upper surface side of the chute 3 through the sorting / removing slit 32.
- the imaging units 411a and 411b may have a built-in line sensor or area sensor. If the imaging units 411a and 411b have a built-in line sensor, defective products and the like can be detected with high accuracy even when the width of the optical detection slit 31 is reduced as compared with the one having a built-in area sensor.
- the lighting units 412a and 412b may use an LED light source, a fluorescent lamp, or the like. If an LED light source is used for the illumination units 412a and 412b, it is difficult for light to diverge due to its characteristics. Therefore, when the image pickup units 411a and 411b image the particles flowing down on the chute 3 at the detection position O, a sufficient amount of light can be secured even if the width of the optical detection slit 31 is small. Even when fluorescent lamps are used as the illumination units 412a and 412b, the same effect as that of the LED light source can be obtained by condensing the light.
- the width of the optical detection slit 31 provided in the chute 3 shall be set in consideration of the size of the sensor element, the amount of light received by the sensor, the inclination angle of the chute, the weight and size of the granules flowing down on the chute, and the like. Can be done.
- the width of the optical detection slit 31 can be 1 to 2 mm.
- the width of the sorting / removing slit 32 provided in the chute 3 can be set to a width that can reliably sort and remove defective granular products.
- the sorting / removing slit 32 is continuously opened in the width direction of the chute 3, it may be intermittently opened in the width direction of the chute 3 in correspondence with a plurality of nozzle holes of the ejector nozzle 431. it can.
- the chute 3 can be provided with a cover on the surface to prevent the particles from splashing. If a cover is provided on the surface of the chute 3, even easily bouncing granules such as beans can be allowed to flow down on the chute 3 at a constant trajectory at all times.
- the ejector device 43 is arranged so that the tip of the ejector nozzle 431 is in contact with or close to the lower surface side of the chute 3, and a defective product flowing down on the chute 3 is removed from the chute 3. It was decided to remove it by injecting air to the upper surface side. Instead of this, by using a suction device as an ejector device, defective products flowing down on the chute 3 can be sucked and removed to the lower surface side of the chute 3 through the sorting and removing slit 32.
- FIG. 5 is a modified example of the optical sorting unit of the first embodiment, and is an explanatory diagram of another example in which defective products are sorted and removed by an ejector device.
- the ejector device 43 has an ejector nozzle 431 arranged on the lower surface side of the chute 3.
- the ejector nozzle 431 As shown in FIG. 5, by arranging the ejector nozzle 431 on the upper surface side of the chute 3 at a height position that does not interfere with the granular particles flowing down on the chute 3, defective products flowing down on the chute 3 can be prevented. It can also be removed by injecting air to the lower surface side of the chute 3 through the sorting / removing slit 32. Further, by using the suction device as the ejector device, it is possible to suck and remove the defective product flowing down on the chute 3 to the upper surface side of the chute 3.
- FIG. 6 is a schematic explanatory view of another modified example of the optical sorting unit of the first embodiment.
- the chute 3 in the optical sorting unit 4, the chute 3 is arranged so that the lower end thereof extends into the non-defective product discharge path 51 of the discharge hopper 5. As shown in FIG. 6, the lower end of the chute 3 may not extend into the non-defective product discharge path 51 of the discharge hopper 5.
- the product determined to be a non-defective product is the non-defective product discharge path 51 of the discharge hopper 5 and the product determined to be defective. Can be discharged from the defective product discharge passage 52 of the discharge hopper 5.
- the chute 3 is provided with an optical detection slit 31 that opens continuously in the width direction of the chute 3 orthogonal to the flow direction of the granular material. Be done. Further, the optical detection devices 41a and 41b use the imaging units 411a and 411b to image the particles flowing down the chute 3 with the position where the optical detection slit 31 is provided as the detection position O. Therefore, unlike the case of detecting the particles in the middle of falling from the lower end of the chute as in the conventional optical sorter, it is possible to detect the particles that always flow down on the chute 3 with a constant trajectory. Therefore, according to the optical sorter of the first embodiment, as compared with the conventional optical sorter, defective granules can be detected with high accuracy, so that the sorting performance can be improved.
- the chute 3 is continuously connected to the chute 3 in the width direction of the chute 3 orthogonal to the flow direction of the granular material on the downstream side of the optical detection slit 31.
- a sorting / removing slit 32 that opens intermittently is provided.
- the ejector device 43 sorts and removes the granules flowing down on the chute 3 to the upper surface side or the lower surface side of the chute 3 through the sorting and removing slit 32. Therefore, unlike the case of the conventional optical sorter that sorts and removes the granules that are falling from the lower end of the chute, the granules that always flow down on the chute 3 with a constant trajectory can be sorted and removed. .. Therefore, according to the optical sorter of the first embodiment, as compared with the conventional optical sorter, defective granules can be sorted and removed with high accuracy, so that the sorting performance can be further improved.
- the optical sorter according to the first embodiment is different from the case where the granular matter in the middle of falling from the lower end of the chute is sorted and removed like the conventional optical sorter, and the chute 3 is used. Granules that always flow down the top with a constant trajectory are sorted and removed. Therefore, the position adjustment of the ejector nozzle 431 becomes unnecessary and the workability is improved.
- the lower end of the chute 3 extends into the non-defective product discharge path 51 of the discharge hopper 5.
- the sorting / removing slit 32 is arranged so as to be located above the non-defective product discharge path 51.
- the ejector device 43 sorts and removes the granules flowing down on the chute 3 into the defective product discharge path 52 through the sorting and removing slit 32. Therefore, the granular matter can be easily and surely sorted and discharged into the non-defective product discharge path 51 and the defective product discharge path 52 of the discharge hopper 5.
- FIG. 7 shows a schematic explanatory view of the optical sorting unit according to the second embodiment.
- the chute 3 is provided with an optical detection slit 31 that opens continuously in the width direction of the chute 3 orthogonal to the flow direction of the granular material.
- the optical sorting unit 4 in the second embodiment is different from the optical sorting unit 4 in the first embodiment in that the sorting / removing slit 32 is not provided on the downstream side of the optical detection slit 31.
- the ejector device 43 is arranged at a position where the tip of the ejector nozzle 431 is on the lower surface side of the chute 3 and is adjacent to the lower end of the chute 3.
- the ejector device 43 is determined to be a defective product among the granules flowing down on the chute 3, and injects air toward the upper surface side of the chute 3 at the moment when the granules are positively dropped from the lower end of the chute 3. Removed by.
- the optical sorting unit 4 in the second embodiment has the same other configurations as the optical sorting unit 4 in the first embodiment, and thus the description thereof is omitted here.
- the ejector device 43 is arranged at a position where the tip of the ejector nozzle 431 is on the lower surface side of the chute 3 and is adjacent to the lower end of the chute 3, and is at the moment when the ejector device 43 is positively dropped from the lower end of the chute 3. It was decided to remove the defective product by injecting air to the upper surface side of the chute 3. Instead of this, by using a suction device as the ejector device, it is possible to suck and remove the defective product at the moment of falling from the lower end of the chute 3 to the lower surface side of the chute 3.
- the ejector device 43 positions the tip of the ejector nozzle 431 at a position on the upper surface side of the chute 3 adjacent to the lower end of the chute 3 and at a height position that does not interfere with the particles falling from the lower end of the chute 3.
- the defective product By disposing the defective product, the defective product at the moment of falling from the lower end of the chute 3 can be removed by injecting air to the lower surface side of the chute 3.
- the suction device as the ejector device, it is possible to suck and remove the defective product at the moment of falling from the lower end of the chute 3 to the upper surface side of the chute 3.
- the tip of the ejector nozzle 431 is provided at a position adjacent to the lower end of the chute 3, and the granular material at the moment of falling from the lower end of the chute 3 is removed. Sort and remove to the upper surface side or the lower surface side of the chute 3. Therefore, unlike the conventional optical sorter, the drop locus of the granular material does not vary at the sort position by the ejector device 43. Therefore, according to the optical sorter of the second embodiment, as compared with the conventional optical sorter, defective granules can be sorted and removed with high accuracy, so that the sorting performance can be further improved.
- the ejector device 43 is arranged at a position where the tip of the ejector nozzle 431 is adjacent to the lower end of the chute 3.
- the ejector nozzle 431 By arranging the ejector nozzle 431 at a position facing the falling locus of particles falling from the lower end of the chute 3, including a position adjacent to the lower end of the chute 3, defective products falling from the lower end of the chute 3 are aired. Can be removed by jetting. Further, by using a suction device as the ejector device 43, it is possible to suck and remove defective products falling from the lower end of the chute 3.
- the ejector nozzle 431 is provided at a position facing the falling locus of the particles falling from the lower end of the chute 3, and falls from the lower end of the chute 3. Defective products are sorted and removed from the drop trajectory.
- the ejector nozzle 431 can be arranged near the lower end of the chute 3, so that the drop locus of the particles is less likely to vary at the sort position by the ejector nozzle 431. Therefore, according to the optical sorter of the second embodiment, as compared with the conventional optical sorter, defective granules can be sorted and removed with high accuracy, so that the sorting performance can be further improved.
- the optical sorting unit 4 has decided to remove defective products, but by removing non-defective products, granules can be sorted into non-defective products and defective products, and mixed with raw materials. It is also possible to sort out the raw material and the foreign matter by removing the foreign matter.
- the ejector device 43 has an ejector nozzle 431 and removes granules by injecting air as an example. Granules can also be removed by mechanical action.
- the optical sorter according to the embodiment of the present invention can accurately detect defective particles, foreign substances, and the like, so that the sorting performance can be improved.
- the optical sorter according to the embodiment of the present invention can accurately sort and remove defective particles, foreign substances, and the like, so that the sorting performance can be further improved.
- Optical sorter 2 Granule supply section 21 Vibration feeder 3
- Optical detection slit 32 Sorting removal slit 4
- Optical sorting section 41a, 41b Optical detection device 411a, 411b Imaging section 412a, 412b Illumination section 42
- Discriminating device 43 Ejector Device 431 Ejector nozzle 5 Discharge hopper 51 Good product discharge path (1st discharge section) 52 Defective product discharge path (second discharge section)
Landscapes
- Sorting Of Articles (AREA)
- Chutes (AREA)
Abstract
Description
被選別物を流下させるために傾斜配置したシュートと、
被選別物を検出位置において検出する光学検出部と、
光学検出部による検出結果に基づいて被選別物を選別除去するエジェクター部と、を備える光学式選別機であって、
光学検出部は、
検出位置を照明する照明部と、
検出位置において被選別物を撮像する撮像部と、を備える光学式選別機において、
シュートには被選別物の流下方向に直交して光学検出用スリットが設けられ、
光学検出部は、光学検出用スリットが設けられる位置を検出位置として、シュート上を流下する被選別物を撮像部により撮像することを特徴とする。
光学検出部が、シュートの上面側及び下面側に一対が設けられ、シュート上を流下する被選別物をシュートの上面側及び下面側から撮像することが好ましい。
シュートには、光学検出用スリットの下流側に被選別物の流下方向に直交して選別除去用スリットが設けられ、
エジェクター部が、シュート上を流下する被選別物を、選別除去用スリットを介してシュートの上面側又は下面側へ選別除去することが好ましい。
エジェクター部が、シュートの下面側に設けられ、シュート上を流下する被選別物を、選別除去用スリットを介してシュートの上面側へ噴風し又はシュートの下面側へ吸引して除去することが好ましい。
エジェクター部が、シュートの上面側に設けられ、シュート上を流下する被選別物を、選別除去用スリットを介してシュートの上面側へ吸引し又はシュートの下面側へ噴風して除去することが好ましい。
さらに、エジェクター部により選別された被選別物を各別に排出する排出ホッパを備え、
シュートは、その下端が排出ホッパの第1排出部内に延出して位置し、選別除去用スリットが第1排出部の上方に位置するように配置され、
エジェクター部が、シュート上を流下する被選別物を、選別除去用スリットを介して排出ホッパの第2排出部へ選別除去することが好ましい。
エジェクター部が、シュートの下端から落下する被選別物の落下軌跡に対向する位置に設けられ、シュートの下端から落下する被選別物を、落下軌跡から選別除去することが好ましい。
エジェクター部が、シュートの下端に隣接する位置に設けられ、シュートの下端から落下する被選別物を、シュートの上面側又は下面側へ選別除去することが好ましい。
エジェクター部が、シュートの下面側に設けられ、シュートの下端から落下する被選別物を、シュートの上面側へ噴風し又はシュートの下面側へ吸引して除去することが好ましい。
エジェクター部が、シュートの上面側に設けられ、シュートの下端から落下する被選別物を、シュートの上面側へ吸引し又はシュートの下面側へ噴風して除去することが好ましい。
撮像部がラインセンサを内蔵するものであることが好ましい。
照明部がLED光源であることが好ましい。
シュート3に設けられる光学検出用スリット31の幅は、センサ素子のサイズ、センサが受光する光量、シュートの傾斜角度、シュート上を流下する粒状物の重量や大きさ等を考慮して設定することができる。例えば米粒の場合には、光学検出用スリット31の幅は、1~2mmとすることができる。
したがって、本発明の一実施形態の光学式選別機によれば、従来の光学式選別機に比べ、被選別物の不良品や異物等を精度よく選別除去することができる。その結果、選別性能がさらに向上する。
したがって、本発明の光学式選別機によれば、従来の光学式選別機に比べ、被選別物の不良品や異物等を精度よく選別除去することができるので、選別性能をさらに向上させることができる。
したがって、本発明の一実施形態の光学式選別機によれば、従来の光学式選別機に比べ、被選別物の不良品や異物等を精度よく選別除去することができるので、選別性能をさらに向上させることができる。
図1は光学式選別機の一例であって概略側断面図を示す。
本発明の実施の形態において、光学式選別機1は、原料となる粒状物を供給する粒状物供給部2、傾斜状に配置されて粒状物を流下させるシュート3、シュート3上を流下する粒状物を検出し、該検出結果に基づいて良品と不良品に選別する光学選別部4、光学選別部4で選別された粒状物を良品と不良品に分けて排出する排出ホッパ5を備える。
図2は実施例1における光学選別部の概略説明図を示す。図3は実施例1におけるシュートの概略斜視図を示す。図4は実施例1の光学選別部において、エジェクター装置により不良品を選別除去する例の説明図である。
実施例1における光学選別部4において、シュート3には、粒状物の流下方向に直交してシュート3の幅方向に連続的に開口する光学検出用スリット31が設けられる。
また、シュート3には、光学検出用スリット31の下流側に粒状物の流下方向に直交してシュート3の幅方向に連続的に開口する選別除去用スリット32が設けられる。
シュート3は、その下端が排出ホッパ5の良品排出路51内に延出して位置している。選別除去用スリット32は、良品排出路51よりも上方に位置するように配設される。
なお、照明部412a,412bとして蛍光灯を用いる場合でも、集光させることで、LED光源と同等の効果を得ることができる。
なお、選別除去用スリット32は、シュート3の幅方向に連続状に開口することとしたが、エジェクターノズル431の複数のノズル孔に対応させてシュート3の幅方向に断続的に開口することもできる。
図4に示す例では、エジェクター装置43は、エジェクターノズル431がシュート3の下面側に配設されるものであった。図5に示すように、エジェクターノズル431をシュート3の上面側であってシュート3上を流下する粒状粒と干渉しない高さ位置に配設することで、シュート3上を流下する不良品を、選別除去用スリット32を介してシュート3の下面側へエアの噴射により除去することもできる。また、エジェクター装置として吸引装置を用いることで、シュート3上を流下する不良品を、シュート3の上面側へ吸引して除去することもできる。
図2に示す例では、光学選別部4において、シュート3は、その下端が排出ホッパ5の良品排出路51内に延出して位置するように配設されるものであった。図6に示すように、シュート3の下端を排出ホッパ5の良品排出路51内に延出しないものとすることもできる。
光学選別部4において、シュート3の下端が排出ホッパ5の良品排出路51内に延出しない場合でも、良品と判別されたものは排出ホッパ5の良品排出路51、不良品と判別されたものは排出ホッパ5の不良品排出路52からそれぞれ排出することができる。
したがって、実施例1における光学式選別機によれば、従来の光学式選別機に比べ、粒状物の不良品を精度よく検出することができるので、選別性能を向上させることができる。
したがって、実施例1における光学式選別機によれば、従来の光学式選別機に比べ、粒状物の不良品を精度よく選別除去することができるので、選別性能をさらに向上させることができる。
図7は実施例2における光学選別部の概略説明図を示す。
実施例2における光学選別部4において、シュート3には、粒状物の流下方向に直交してシュート3の幅方向に連続的に開口する光学検出用スリット31が設けられる点で実施例1における光学選別部と共通する。実施例2における光学選別部4は、光学検出用スリット31の下流側に選別除去用スリット32が設けられるものでない点で実施例1における光学選別部と相違する。
したがって、実施例2における光学式選別機によれば、従来の光学式選別機に比べ、粒状物の不良品を精度よく選別除去することができるので、選別性能をさらに向上させることができる。
したがって、実施例2における光学式選別機によれば、従来の光学式選別機に比べ、粒状物の不良品を精度よく選別除去することができるので、選別性能をさらに向上させることができる。
2 粒状物供給部
21 振動フィーダ
3 シュート
31 光学検出用スリット
32 選別除去用スリット
4 光学選別部
41a,41b 光学検出装置
411a,411b 撮像部
412a,412b 照明部
42 判別装置
43 エジェクター装置
431 エジェクターノズル
5 排出ホッパ
51 良品排出路(第1排出部)
52 不良品排出路(第2排出部)
Claims (8)
- 被選別物を流下させるために傾斜配置したシュートと、
前記被選別物を検出位置において検出する光学検出部と、
前記光学検出部による検出結果に基づいて前記被選別物を選別除去するエジェクター部と、を備える光学式選別機であって、
前記光学検出部は、
前記検出位置を照明する照明部と、
前記検出位置において前記被選別物を撮像する撮像部と、を備える光学式選別機において、
前記シュートには前記被選別物の流下方向に直交して光学検出用スリットが設けられ、
前記光学検出部は、前記光学検出用スリットが設けられる位置を前記検出位置として、前記シュート上を流下する前記被選別物を前記撮像部により撮像することを特徴とする光学式選別機。 - 前記光学検出部は、前記シュートの上面側及び下面側に一対が設けられ、前記シュート上を流下する前記被選別物を前記シュートの上面側及び下面側から撮像する請求項1記載の光学式選別機。
- 前記シュートには、前記光学検出用スリットの下流側に前記被選別物の流下方向に直交して選別除去用スリットが設けられ、
前記エジェクター部は、前記シュートの下面側に配設されて、前記シュート上を流下する前記被選別物を、前記選別除去用スリットを介して前記シュートの上面側へ噴風し又は前記シュートの下面側へ吸引して除去する請求項1又は2記載の光学式選別機。 - 前記シュートには、前記光学検出用スリットの下流側に前記被選別物の流下方向に直交して選別除去用スリットが設けられ、
前記エジェクター部は、前記シュートの上面側に配設されて、前記シュート上を流下する前記被選別物を、前記選別除去用スリットを介して前記シュートの上面側へ吸引し又は前記シュートの下面側へ噴風して除去する請求項1又は2記載の光学式選別機。 - さらに、前記エジェクター部により選別された被選別物を各別に排出する排出ホッパを備え、
前記シュートは、その下端が前記排出ホッパの第1排出部内に延出して位置し、前記選別除去用スリットが前記第1排出部の上方に位置するように配置され、
前記エジェクター部は、前記シュート上を流下する前記被選別物を、前記選別除去用スリットを介して前記排出ホッパの第2排出部へ選別除去する請求項3又は4記載の光学式選別機。 - 前記エジェクター部は、前記シュートの下端から落下する前記被選別物の落下軌跡に対向する位置に設けられ、前記シュートの下端から落下する前記被選別物を、前記落下軌跡から選別除去する請求項1又は2記載の光学式選別機。
- 前記エジェクター部は、前記シュートの下端に隣接する位置であって、前記シュートの下面側に設けられ、前記シュートの下端から落下する前記被選別物を、前記シュートの上面側へ噴風し又は前記シュートの下面側へ吸引して除去する請求項6記載の光学式選別機。
- 前記エジェクター部は、前記シュートの下端に隣接する位置であって、前記シュートの上面側に設けられ、前記シュートの下端から落下する前記被選別物を、前記シュートの上面側へ吸引し又は前記シュートの下面側へ噴風して除去する請求項6記載の光学式選別機。
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