JP5163623B2 - Color sorter - Google Patents

Description

  The present invention relates to a color sorter that sorts grains such as grains and resin pellets by color, and relates to a small color sorter suitable for use by farmers, for example.

  Conventionally, the color of raw materials consisting of grains such as rice and wheat, resin pellets, coffee beans, and other granular materials is classified into non-defective products and defective products by color, and foreign substances mixed in the raw materials are sorted and removed by color. Sorters are known. (See Patent Document 1).

FIG. 9 is a schematic perspective view of a color sorter described in Patent Document 1, and FIG. 10 is a side sectional view of a primary sorting unit in the color sorter described in FIG.
The color sorter described in Patent Document 1 is of a large type used in a rice mill or the like, and as shown in FIG. 9, a plurality of primary sorting units 102A and secondary sorting units 102B are arranged in parallel. The entire device is formed wide. Here, the primary sorting unit 102A and the secondary sorting unit 102B have substantially the same configuration except for the chute surface.

As shown in FIGS. 9 and 10, the color sorter described in Patent Document 1 is provided with a front door 130 that can be turned up and down by an air cylinder 135 on an inclined wall in front of the machine frame F. is there.
Then, as shown in FIG. 10, the primary sorting unit 102A of the color sorter is arranged at an angle of about 60 degrees in order to move down the primary sorting grain in a state of being expanded in the width direction. A chute 103A, a storage tank 104 for storing grains for primary sorting, and a vibration feeder 105 for conveying the grains for primary sorting from the storage tank 104 to the chute 103A are provided. Further, the primary sorting unit 102A includes a pair of optical detection units 106a and 106b provided across the top and bottom of the grain flow trajectory flowing down from the lower end of the chute 103A, and an ejector nozzle 107 provided further below. It is. Further, the primary sorting unit 102A is on the same inclination line as the chute 103A below the ejector nozzle 107, and receives a non-defective primary waste discharging rod 108A that receives grains that flow down without receiving a blast from the ejector nozzle 107, and It is formed in a hopper shape so as to surround the periphery of the primary good product discharge basket 108A, and is provided with a primary defective product discharge basket 109A in order to collect defective products from normal grains in response to a blast from the ejector nozzle 107.

  The optical detectors 106a and 106b are respectively formed of boxes 115a and 115b. The box 115a above the grain flow trajectory has a visible light CCD camera 116a and a near infrared light NIR camera 117. In addition, visible light sources 118a and 118a made of fluorescent lamps, a near-infrared light source 119a made of a halogen lamp and the like, and an opposing background 120a for the optical detection unit 106b are incorporated. On the other hand, the box 115b below the grain flow trajectory has a visible light CCD camera 116b, visible light sources 118b and 118b made of fluorescent lamps, a near-infrared light source 119b made of halogen lamps and the like, optical Opposing backgrounds 120b and 120c for the detection unit 106a are provided. And the window members 121a and 121b which consist of transparent glass are engage | inserted by the flow trajectory side of the grain in each box 115a, 115b. An inspection door 122 that can be opened and closed by an air cylinder is provided on the upper side of the upper box 115a.

  The color sorter described in Patent Document 1 performs maintenance of the chutes 103A and 103B, the ejector nozzle 107, and the like inside the sorter by lifting the front door 130 upward. Further, the inspection door 122 is opened with the front door 130 lifted upward, and the optical detection unit 106a is maintained.

  Since the color sorter is used in a rice mill or the like, a raw material having a relatively clean surface of rice grains is supplied through various processes such as a coarse sorter and a grain sorter in the previous process. Therefore, it is not necessary to frequently clean the inside of the sorter such as the optical detector. The color sorter was cleaned by specialized workers at each factory.

  By the way, when using a color sorter in a farmhouse, it is possible that the brown rice immediately after removing the straw and removing the rice husk is supplied as a raw material from the rice grinder. The brown rice immediately after the detachment is mixed with fine dust such as rice husk debris, swarf, rice cake, and rice cake. When the brown rice containing these is supplied to the color sorter, the dust rises inside the sorter. It adheres to and accumulates on the detection unit, etc., and the sorting performance of the sorter decreases.

  In order to solve this problem, the present applicant arranges a cleaning means for the transparent plate provided on the side of the flow path of the raw material in the optical detection unit, that is, on the side of the raw material detection position in the sorting machine, and adheres to the transparent plate at regular intervals.・ Technology is being developed to ensure the performance of the sorter by removing the accumulated dust, etc., but in order to completely remove the dust that has adhered to and accumulated in the sorter, the inside of the worker must be regularly Cleaning is essential.

  However, in the case where the front door 130 is lifted or the inspection door 122 is opened like the color sorter described in Patent Document 1, the size is reduced to a size suitable for use by a farmer. It is difficult. Also, the work of removing dust and the like adhering to and depositing on the transparent plate of the optical detection unit located below the lower ends of the chutes 103A and 103B, the ejector nozzle 107, and the like is frequently performed in an environment where there are no specialized workers. It is not easy.

JP 2007-283204 A

  Therefore, the present invention can reduce the size of the apparatus so as to be suitable for use by farmers and the like, and dust attached to and deposited on a transparent plate or an ejector provided on the flow path side of the raw material in the optical detection unit. An object of the present invention is to provide a color sorter that can be easily removed even when there are no specialized workers.

  In order to achieve the above-mentioned object, the present invention provides a chute that is inclined to flow down an object to be sorted, a front optical detection means that is arranged in front of the flow trajectory of the sorted object that flows down from the lower end of the chute, and a front optical In the color sorter provided further below the detection means, and including an ejector means for removing foreign matters or defective products from the object to be sorted based on the detection result by the front optical detection means, the front optical detection means is The upper part is connected to the sorter main body via a hinge so that the lower part can be pivoted upward, and a space in which an object to be sorted formed between the front optical detection means and the sorter body flows down. It can be opened and closed.

  Further, the present invention is the color sorter, wherein the rear optical detection means is disposed at the position of the sorter body facing the front optical detection means across the flow path of the sorting object, the front optical detection means The upper part is connected to the rear optical detection means via a hinge.

  According to the present invention, the front optical detection means is configured by disposing at least an illumination means for illuminating the detection position of the object to be selected and an image pickup means for imaging the object to be selected at the detection position in the box of the cover. preferable.

  In the present invention, the four corners of the facing surface between the front optical detection means and the sorter body, or the four corners of the facing surface between the front optical detection means and the rear optical detection means have pins on one side and the pins on the other side. It is preferable that the hole to be inserted is formed and the hole formed on the upper side which is the hinge side is a long hole in the vertical direction.

  In the present invention, it is preferable that wiring to the front optical detection means is performed via an internal space formed in the hinge.

  In the present invention, it is preferable that the front optical detection means is supported by a support means at a position that opens a space where the object to be sorted flows down.

  In the present invention, it is preferable that the front optical detection means is fixed by a fixing member at a position that closes a space where the object to be sorted flows down.

  In the color sorter of the present invention, the front optical detection means is connected to the sorter main body via a hinge at the upper part so that the lower part can be rotated upward, and the front optical detection means, the sorter main body, Since the space in which the object to be formed flows between can be opened and closed, by rotating the front optical detection means upward, the space in which the object to be separated flows down can be easily opened, Can be easily removed, and dust and the like adhering to and depositing on the chute, the optical detector, and the ejector can be easily removed. Further, since the front optical detection means is rotated upward, dust or the like adhering to and accumulating in the space can be dropped downward, and the removal work is facilitated.

  Further, the color sorter of the present invention is such that the front optical detection means is arranged at the upper portion thereof at the position of the sorter main body facing the front optical detection means across the flow path of the object to be sorted. Are preferably connected to each other via a hinge because the sorting accuracy of the sorter can be improved.

  In the color sorter of the present invention, the front optical detection means is configured by disposing at least an illumination means for illuminating a detection position and an imaging means for imaging an object to be sorted at the detection position in a cover box. If so, the front optical detection means can be made compact to reduce the size of the apparatus, and the front optical detection means can be easily handled during rotation.

  In the color sorter of the present invention, the four corners of the facing surfaces of the front optical detection means and the sorting machine main body, or the four corners of the facing surfaces of the front optical detection means and the rear optical detection means, have one pin and the other If the hole into which the pin is inserted is formed and the hole formed in the upper part on the hinge side is a long hole in the vertical direction, the space in which the object to flow is opened is opened. The front optical detection means can be easily returned to the position before opening, and no advanced technique is required for alignment of the visual field center axis (optical axis) of the imaging means in the front optical detection means.

  In the color sorter according to the present invention, if the wiring to the front optical detection means is performed through the internal space formed in the hinge, the wiring is not exposed to the outside. It is preferable in appearance.

  In the color sorter according to the present invention, if the front optical detection means is supported by the support means at a position that opens the space where the object to be sorted flows down, the rotated front optical detection means is arbitrarily closed. Therefore, cleaning work by an operator can be performed safely.

  In the color sorter according to the present invention, if the front optical detection means is fixed at a position that closes the space where the sorting object flows down by the fixing means, the front optical detection means freely rotates during the sorting operation. Therefore, it is possible to safely perform sorting work by an operator. Further, if a patchon lock is used as the fixing member, the front optical detection means can be easily fixed or released.

The whole perspective view from the front upper right of the color sorter | selector in embodiment of this invention. The schematic explanatory drawing of the internal structure in the color sorter | selector of FIG. FIG. 3 is an enlarged explanatory view in the vicinity of an optical detection unit in FIG. 2. The perspective view which shows the state which rotated the front side optical detection part of the color sorter | selector of FIG. 1 upwards. The whole perspective view of the state which rotated the front side optical detection part upwards in FIG. In FIG. 2, explanatory drawing of the state which rotated the front side optical detection part upwards. Explanatory drawing which shows the relationship between the pin and hole for performing position alignment of both front and rear optical detection parts. Explanatory drawing of the hinge for enabling a front side optical detection part to rotate upwards. The schematic perspective view of the conventional color sorter. The sectional side view of the primary selection part in the color sorter | selector of FIG.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an overall perspective view from the front upper right of the color sorter according to the embodiment of the present invention, and FIG. 2 is a schematic explanatory diagram of the internal structure from the right side of the color sorter, which is a primary sorting unit Is shown.

  The color sorter according to the embodiment of the present invention is capable of sorting non-defective products and defective products or foreign substances mixed in the raw materials by color using grains, resin pellets, coffee beans, and other granular materials as raw materials. .

  A color sorter 1 according to an embodiment of the present invention includes an elevating unit 2 for granulating raw materials, an optical sorting unit 3 for sorting raw materials located on the front side of the elevating unit 2, and the optical sorting. A vibrating conveyor 4 is provided below the section 3 for returning the sorted raw material to the lifting section 2.

  The raising / lowering part 2 is comprised in the state which arranged the 1st thru | or 3rd bucket conveyors 5-7 in the front view width direction of the color sorter 1, and as shown in FIG. 7 is housed compactly in the housing.

  The optical sorting unit 3 is discriminated as a defective product or a foreign substance as a result of detection by the optical detection unit 32 that detects a plurality of raw materials falling in a state of spreading in the front view width direction of the color sorter 1 and the detection by the optical detection unit 32. And an ejector 33 that removes an object by air, and a primary sorting section and a secondary sorting section are arranged side by side in the width direction. The primary sorting unit and the secondary sorting unit have substantially the same structure except for the chute surface.

  The vibrating conveyor 4 is disposed below the optical sorting unit 3 and conveys the raw material sorted by the optical sorting unit 3 toward the corresponding bucket conveyors 5 to 7. Although a vibrating conveyor is used here, other means such as a belt conveyor may be used.

  As shown in FIG. 2, in the color sorter 1, the raw material charged into the charging hopper 8 is granulated by the first bucket conveyor 5 and stored in the first storage tank 15, and then the first rotary valve 18. Is supplied to the first chute 24 at a constant flow rate.

  The raw material flowing down on the first chute 24 is detected by the primary sorting unit. As a result of the detection, the non-defective product is bounced from the first discharge basket 16 and the defective product is bounced by the ejector 33 from the second discharge basket 17, respectively. 4 falls on the corresponding trough.

And the raw material made into the quality goods in the primary selection part is conveyed to the 2nd bucket conveyor 6 by the vibration conveyor 4, and is granulated, and is discharged | emitted outside the machine for bagging etc.
Moreover, the raw material made into the inferior goods is conveyed by the 3rd bucket conveyor 7, and is stored in the 2nd storage tank which is not shown in figure, Then, the 2nd chute | shoot 25 (FIG. 5, FIG. 6).

The raw material that flows down on the second chute 25 is detected in the secondary sorting section, and as a result of the detection, the non-defective product falls from the third discharge rod 18 onto the corresponding trough of the vibrating conveyor 4, and is It is granulated together with the raw material that has been transported to the bucket conveyor 5 and put into the feeding hopper 8 and is sorted again in the primary sorting section.
On the other hand, the raw material which is regarded as defective is bounced by the ejector 33 and directly discharged from the fourth discharge rod 19 to the outside of the apparatus.

  Next, the configuration of the optical detection unit 32 of the color sorter 1 in the embodiment of the present invention will be described.

  FIG. 3 is an explanatory diagram of the internal structure of the optical detector 32 in the color sorter of the present embodiment, and FIG. 4 is a perspective view of the state where the front optical detector 32a of the color sorter is rotated. It is shown.

  As shown in FIGS. 3 and 4, the optical detection unit 32 in the present embodiment is arranged with the first chute 24 and the second chute 25 sandwiched between the front and rear optical detection units 32 a and the rear optical detection. Part 32b. Here, the rear optical detection unit 32b is fixed to the sorter body.

  As shown in FIG. 3, the front optical detection unit 32a includes a front sensor 34a composed of a CCD line sensor, a mirror 35a, a light source 36a composed of a fluorescent lamp, and a background 37a as background means in a cover box. It is arranged. A transparent plate 38a made of glass or the like is provided on the raw material flow path side where the light source 36a is arranged to prevent dust or the like of the raw material from entering the box of the cover, and the background is placed inside the transparent plate 38a. 37a is attached. Here, the background 37a is disposed to face the visual field center axis (optical axis) of the rear sensor 34b in the rear optical detection unit 32b. The light source 36a is shorter than the combined width of the first chute 24 and the second chute 25, and is disposed inside the outer ends of the chutes 24 and 25.

  As shown in FIG. 4, the front optical detection unit 32 a is provided with a handle 43 below the outer front side of the cover, and with a patch ending metal fitting 442 at the lower end thereof. As shown in FIG. 1, the patching metal fitting 442 is locked below the front optical detection unit 32a and by a patching lock main body 441 attached to the sorting machine main body.

  On the other hand, the rear optical detection unit 32b is similarly provided with a rear sensor 34b composed of a CCD line sensor, a mirror 35b, a light source 36b composed of a fluorescent lamp, and a background 37b as background means in the cover box. It will be. A transparent plate 38b made of glass or the like is provided on the raw material flow path side where the light source 36b is disposed in order to prevent dust and the like of the raw material from entering the box of the cover, and the background is placed inside the transparent plate 38b. 37b is attached. Here, the background 37b is disposed opposite to the visual field center axis (optical axis) of the front sensor 34a in the front optical detection unit 32a. Further, the light source 36b of the rear optical detection unit 32b is also used with a length shorter than the combined width of the first chute 24 and the second chute 25, and is arranged on the inner side of the outer ends of the chutes 24, 25. Has been.

  As shown in FIG. 4, the chute 24 is provided on the inner surfaces of both side walls of both covers at the location where the light source 36a is arranged in the front optical detection unit 32a and at the location where the light source 36b is arranged in the rear optical detection unit 32b. , 25 are provided with reflecting plates 51a, 51b made of mirrors or the like, respectively, in order to ensure the light quantity at the outer end portions of the mirrors. The reflecting plates 51a and 51b may be any members that can secure the light amount at the outer ends of the chutes, and other members having a mirror finish can be used in addition to the mirrors.

  As shown in FIG. 3, the optical detectors 32a and 32b in the present embodiment illuminate the raw material falling from the lower ends of the chutes 24 and 25 with the light sources 36a and 36b, and use the mirror 35a and Images are taken by the sensors 34a and 34b via 35b. At that time, the light quantity at the outer ends of the chutes 24 and 25 can be secured by the reflecting plates 51a and 51b attached to the inner surfaces of both side walls of both covers located on the side of the detection position.

  As shown in FIG. 4, the rear optical detection unit 32b includes transparent plate wiping wipers 52a and 52b for cleaning the transparent plates 38a and 38b of both optical detection units 32a and 32b, and both optical detection units 32a and 32b. A rectangular cleaning wiper 53 in which reflecting plate wiping wipers 52c and 52c for cleaning the reflecting plates 51a and 51b attached to the inner surfaces of both side walls of the cover 32b are integrated. The cleaning wiper 53 slides up and down in the cover by driving means such as an air cylinder, and wipes and cleans the transparent plates 38a and 38b and the reflecting plates 51a and 51b.

  Since both optical detectors 32a and 32b in the present embodiment wipe and clean the transparent plates 38a and 38b and the reflecting plates 51a and 51b with the cleaning wiper 53, the amount of light caused by the adhering of the raw material dust or the like is reduced. Reduction can be prevented.

As shown in FIG. 4, calibration plates 39b are attached to both end portions in the inner side surface width direction of the transparent plate 38b in the rear optical detection unit 32b, and raw material dust or the like is directly applied to the calibration plate 39b. It is configured not to adhere.
Although not shown, calibration plates are similarly attached to both end portions in the inner side surface width direction of the transparent plate 38a in the front optical detection unit 32a.

  The optical detectors 32a and 32b in the present embodiment are based on the imaging signals of the calibration plates 39a and 39b obtained by imaging with the sensors 34a and 34b at the start of work every morning or during the work. Calibrate (correct) the appropriate light intensity range for distinguishing raw materials from defective or foreign materials, that is, the high-level threshold and low-level threshold, and the effects of fluctuations in the light intensity of light sources such as fluorescent lamps and the light reception sensitivity of cameras However, since the calibration plates 39a and 39b are attached to the inner side surfaces of the transparent plates 38a and 38b, they are not affected by adhesion of raw material dust or the like. In addition, since dust and the like adhering to the outer surfaces of the transparent plates 38a and 38b are wiped and cleaned by the cleaning wiper 53 as described above, the influence of the dust or the like of the raw material is minimized when the threshold values are calibrated. Is possible.

  By the way, in this Embodiment, the front side optical detection part 32a and the rear side optical detection part 32b are connected via the left-right paired hinge 41 in the upper part of a cover, respectively. Therefore, as shown in FIG. 4, the operator holds the handle 43 provided on the lower front outside of the front optical detection unit 32a, removes the patch lock 44, and moves the front optical detection unit 32a upward. , The space where the raw material formed between the two optical detection means 32a and 32b flows down can be opened, and the inside thereof can be exposed. 5 is an overall perspective view of the state where the front optical detection unit 32a is rotated upward in FIG. 1, and FIG. 6 is an explanatory view of the state where the front optical detection unit 32a is rotated upward in FIG. It is shown.

  For example, a gas spring 45 is disposed between the front optical detection unit 32 a and the rear optical detection unit 32 b, and the front optical detection unit 32 a rotated upward is opened by the gas spring 45. It is configured to be maintained. If the front optical detection unit 32a is supported at the open position by the gas spring, the front optical detection unit 32a will not be closed without permission, so that the operator can safely perform a cleaning operation or the like.

  In addition, a shock absorber 46 is provided below the surface of the rear optical detection unit 32b facing the front optical detection unit 32a, and the front optical detection unit 32a is rotated downward to close the space. It is configured to reduce the impact.

  As described above, the front optical detection unit 32a locks the patch lock main body 441 attached to the sorting machine main body side to the patch lock metal fitting 442 provided at the lower end portion on the outer front side of the cover, thereby It is comprised so that it can fix to the position which closes the space where a raw material flows down. If the front optical detection unit 32a is kept closed by the patch lock 44, the front optical detection unit 32a does not open without permission, so that the operator can perform a sorting operation and the like safely.

At the four corners of the facing surfaces of the front optical detection unit 32a and the rear optical detection unit 32b, holes are formed on one side and pins are inserted into the other. FIG. 7 shows a case where holes 47 and 48 are formed on the front optical detection unit 32a and pins 49 and 49 are formed on the rear optical detection unit 32b.
As shown in FIG. 7, the hole formed on the side of the front optical detection unit 32a has a long hole 47 on the side close to the hinge 41, and both optical detection units rotate by rotating the front optical detection unit 32a downward. When closing the space between 32a and 32b, the pin 49 formed on the side close to the hinge 41 of the rear optical detection unit 32b can be engaged with the elongated hole 47 smoothly. Therefore, the front optical detection unit 32a can be accurately returned to the position before being rotated upward by the engagement of the pins 49 and 49 and the holes 47 and 48, and the visual field central axis (light Advanced technology is not required to align the axis. Needless to say, a pin may be formed on the front optical detection unit 32a and a hole may be formed on the rear optical detection unit 32b.

As shown in FIG. 8A, the hinge 41 connecting the front side optical detection unit 32a and the rear side optical detection unit 32b is composed of a combination of two members 411 and 412. One of these two members 411 and 412 is fixed to the front optical detection unit 32a and the other 412 is fixed to the rear optical detection unit 32b, but is partially cut in FIGS. 8B and 8C. As shown in a missing state, the inside of each is hollow, and both members 411 and 412 are connected at a shaft portion 413.
The front optical detection unit 32a needs to perform various wirings between the control device and the like provided in the sorter body and the front sensor 34a and the light source 36a disposed in the box of the cover. Since it is carried out through the cavities formed in the members 411 and 412 constituting the hinge 41, it is not exposed to the outside and obstructs a worker or the like.

  The optical detection unit 32 in the embodiment of the present invention rotates the lower part of the front optical detection unit 32a upward to easily open the space where the raw material formed between the rear optical detection unit 32b flows down. Since the inside can be exposed, dust or the like adhering to and depositing on the chutes 24 and 25, the optical detectors 32a and 32b, the ejector 33, and the like can be easily removed. Further, since the front optical detection unit 32a is rotated upward, dust or the like adhering to and accumulating in the space can be dropped to the open side, and the removal operation is easy.

  Further, the front optical detection unit 32a includes a light source 32a that illuminates the raw material at the detection position, a front sensor 34a that images the raw material that passes through the detection position, and an imaging direction of the rear sensor 34b of the rear optical detection unit 32b, That is, since the background located on the visual field center axis (optical axis) of the rear sensor 34b and behind the detection position is arranged in the box of the cover, the front optical detection unit 32a is compact. In addition, it is possible to facilitate handling when rotating upward and to reduce the size of the color sorter.

  In the color sorter in the above embodiment, the optical detection unit 32 is arranged in a pair on the top and bottom or front and back with the chute interposed therebetween, but the optical detection unit 32 may be arranged only on the front side. . In this case, the front optical detection unit 32a is connected to the sorter main body via a hinge at the upper part of the cover of the front optical detection unit 32a, and is formed between the sorter main body by rotating the lower part upward. The space where the raw material flows down can be opened.

  Moreover, although the said color sorter uses a gas spring as a means to support the front side optical detection part 32a rotated upwards, you may use support members, such as another damper member. .

  Further, the color sorter uses a patchon lock as means for fixing the front optical detection unit 32a to the sorter body, but may use other fixing members.

  The color sorter includes a primary sorting unit and a secondary sorting unit, but may include only a primary sorting unit. Moreover, you may provide the sorting part more than tertiary.

  The color sorter uses air as ejector means for removing defective products, foreign matters, and the like, but may use a leaf spring driven by a solenoid or the like.

  The color sorter uses a line sensor as means for imaging the raw material at the detection position, but may use an area sensor.

  Needless to say, the configuration of the color sorter of the present invention is not limited to the above embodiment, and the configuration thereof can be changed as appropriate without departing from the scope of the present invention.

  The color sorter of the present invention can easily open the space where the sorting object flows by rotating the front optical detection means upward, and adheres and accumulates on the chute, the optical detection unit, the ejector, and the like. Dust and the like can be easily removed.

DESCRIPTION OF SYMBOLS 1 Color sorter 2 Elevating part 3 Optical sorting part 4 Vibrating conveyor 8 Loading hopper 24 1st chute 25 2nd chute 32 Optical detection part 32a Front side optical detection part 32b Back side optical detection part 33 Ejector 34a Front side sensor 34b Back side sensor 35a, 35b Mirror 36a, 36b Light source 37a, 37b Background 38a, 38b Transparent plate 39b Calibration plate 41 Hinge 43 Handle 44 Patchon lock 45 Gas spring 46 Shock absorber 47 Long hole 48 Round hole 49 Pins 51a, 51b Reflective plate 52a, 52b Transparent plate Wiper wiper 52c Reflector wiper wiper 53 Cleaning wiper

Claims (9)

A chute that is inclined to flow down the object to be sorted, a front optical detection means that is arranged in front of a flow trajectory of the sorting object that flows down from the lower end of the chute, and is provided further below the front optical detection means, In a color sorter comprising an ejector unit that removes foreign matters or defective products from an object to be sorted based on a detection result by an optical detection unit,
The front optical detection means is connected to a sorter main body via a hinge at an upper portion thereof so that the lower portion can be rotated upward, and is formed between the front optical detection means and the sorter main body. A color sorter characterized in that the space through which the sorts flow down can be opened and closed.   A rear optical detection means is disposed at a position of the sorter main body facing the front optical detection means across the flow path of the object to be sorted, and the front optical detection means has a rear optical detection means at the upper part thereof. The color sorter according to claim 1, wherein the color sorter is connected via a hinge.   The front optical detection means is configured by arranging in the cover box an illuminating means for illuminating at least a detection position of the selection object and an imaging means for imaging the selection object at the detection position. The color sorter according to claim 1.   The front optical detection means is configured by arranging in the cover box an illuminating means for illuminating at least a detection position of the selection object and an imaging means for imaging the selection object at the detection position. The color sorter according to claim 2.   At the four corners of the facing surface between the front optical detection means and the sorter body, a pin is formed on one side, and a hole into which the pin is inserted is formed on the other side. The color sorter according to claim 1 or 3, wherein the color sorter has a long hole.   At the four corners of the facing surface of the front optical detection means and the rear optical detection means, a pin is formed on one side and a hole into which the pin is inserted is formed on the other side. The color sorter according to claim 2 or 4, wherein the color sorter is formed into a long hole in the vertical direction.   The color sorter according to any one of claims 1 to 6, wherein wiring to the front optical detection means is performed via an internal space formed in the hinge.   The color sorter according to any one of claims 1 to 7, wherein the front optical detection means is supported by a support means at a position that opens a space where the object to be sorted flows down.   The color sorter according to any one of claims 1 to 8, wherein the front optical detection means is fixed by a fixing means at a position that closes a space in which the sorting object flows down.

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