JP2021102176A - Optical type sorter - Google Patents

Abstract

To provide an optical type sorter which prevents ingress of dust etc. generated on a surface side of a chute into the back side through an optical detection slit to make sorting errors less likely to occur.SOLUTION: An optical detection slit 12 is formed on a chute 6 in which objects to be sorted flow down on its surface. An optical inspection part 7 which inspects the objects to be sorted, flowing down on the surface of the chute 6, has a rear side optical inspection part 7a installed on the back side of the optical detection slit 12 of the chute 6. The back side of the chute 6 is provided with an air nozzle 23 for a slit which may form an air curtain 25 for preventing ingress of dust etc. from the optical detection slit 12 into the rear side optical inspection part 7a.SELECTED DRAWING: Figure 3

Description

The present invention relates to an optical sorting device that sorts granules such as grains, beans, and resin pellets based on color and the like.

Granules such as grains, beans, and resin pellets may be classified into non-defective products and defective products based on color and the like to remove defective products or foreign substances mixed in.
For example, in Patent Document 1, an optical detection unit is provided below a chute through which grains flow down with a falling locus of particles falling from the chute, and an ejector nozzle is provided further below the optical detection unit for optical detection. Optical granule sorting that detects whether the granules that fall in the part are non-defective or defective, and removes the granules that are considered to be defective from the granules that are flowing down by the high-pressure blast ejected from the ejector nozzle. The device is disclosed.

The optical granular material sorting device as described in Patent Document 1 removes defective products that have fallen from the chute with a blast, but the granular material that does not fall a certain flight trajectory due to the disturbance of the flight attitude in the air. Therefore, there is a possibility that the blast does not hit the defective product and causes a selection error.

The applicant has applied for Patent Document 2 in order to improve the sorting performance. In this method, the chute of the part to be sorted is provided with a slit for optical detection and a slit for sorting and removing.

Japanese Patent No. 6037125 Japanese Patent Application No. 2019-209821

In the optical sorting device as in Patent Document 2, a slit for optical detection of the chute is formed. Therefore, dust such as dust and powder particles generated by the flowing particles may enter the back surface side of the chute through the optical detection slit and adhere to the equipment installed on the back surface side of the chute to have an adverse effect. .. In particular, when the optical device is attached to a paddy machine, the performance of the optical device is significantly deteriorated due to the adhesion of dust and the like, and sorting errors are likely to occur.

It is also conceivable to fit a light transmitting plate in the slit for optical detection to prevent dust and the like from entering. However, if dust or the like adheres to the translucent plate, there is a concern that the translucency may decrease. Further, when trying to remove dust or the like adhering to the light transmitting plate, since the removing means is operated on the surface side of the chute, it is necessary to stop the flow of the granular material, and the sorting work is interrupted.

The problem to be solved by the present invention is that the optical detection slit is not provided with a light-transmitting plate, and dust and the like generated on the front surface side of the chute is prevented from entering the back surface side through the optical detection slit, resulting in selection error. The purpose is to provide an optical sorting device that is unlikely to occur.

The invention according to claim 1 of the present application is irradiated by an optical detection slit, a chute through which an object to be sorted flows down the surface, an illumination unit that irradiates light toward the optical detection slit, and the illumination unit. The rear side optical inspection unit has a light receiving unit that receives at least one of the transmitted light and the reflected light of the light, and at least one of the illumination unit and the light receiving unit is arranged on the back surface side of the chute. An optical type having an optical inspection unit that inspects an object to be sorted flowing down the surface of the chute, and an ejector unit that sorts and removes the object to be sorted based on the inspection result of the optical inspection unit. The sorting device is characterized in that an air nozzle for slits capable of forming an air curtain that prevents dust and the like from entering from the optical detection slit to the rear side optical inspection portion is provided on the back surface side of the chute. It is an optical sorting device.

The invention according to claim 2 of the present application is characterized in that the slit air nozzle is arranged so that the air of the air curtain is ejected from the upstream side to the downstream side of the chute. Optical sorting device.

In the invention according to claim 3, the ejector portion has an ejector nozzle capable of ejecting air to the object to be sorted on the downstream side of the optical detection slit, and the air curtain ejected from the slit air nozzle. The claim is characterized in that an exhaust portion is provided on the downstream side of the wind portion, and the surface of the exhaust portion facing the slit air nozzle is inclined to the downstream side as the distance from the optical detection slit increases. Item 2. The optical sorting apparatus according to item 2.

In the invention according to claim 4, the rear side optical inspection unit allows air to flow between the slit air nozzle and at least one of the illumination unit and the light receiving unit of the rear side optical inspection unit. The optical sorting apparatus according to any one of claims 1 to 3, further comprising a rear translucent plate that blocks the light.

The invention according to claim 5 of the present application is an air nozzle for a rear translucent plate capable of forming an air curtain for preventing dust and the like from adhering to the rear translucent plate on the slit side of the rear translucent plate. The optical sorting apparatus according to claim 4, wherein the optical sorting apparatus is provided.

In the invention according to claim 6, the rear side optical inspection unit allows air to flow between the slit air nozzle and at least one of the illumination unit and the light receiving unit of the rear side optical inspection unit. A rear light-transmitting plate is provided, and an air curtain capable of forming an air curtain for preventing dust or the like from adhering to the rear light-transmitting plate can be formed on the slit air nozzle side of the rear light-transmitting plate. An air nozzle for a plate is provided, and an exhaust portion is provided on the downstream side of the air curtain that blows out from the air nozzle for the rear translucent plate. The optical sorting apparatus according to claim 3, wherein the air is also exhausted.

In the invention according to claim 7, the optical inspection unit includes an illumination unit that irradiates light toward the optical detection slit, and transmitted light and reflected light from the selection unit of the light emitted by the illumination unit. It has a light receiving unit that receives at least one of the above, and at least one of the illumination unit and the light receiving unit has a front side optical inspection unit arranged on the surface side of the chute, and the front surface. The side optical inspection unit includes a front light transmitting plate that blocks the flow of air between the chute and at least one of the illumination unit and the light receiving unit of the front side optical inspection unit. The chute side of the front light-transmitting plate is provided with an air nozzle for the front light-transmitting plate capable of forming an air curtain for preventing dust and the like from adhering to the front light-transmitting plate. The optical sorting apparatus according to any one of claims 1 to 6.

The invention according to claim 8 of the present application is characterized in that the air nozzle for a front light transmitting plate is arranged so that the air curtain to be formed is ejected so as to be gradually separated from the flow direction of the object to be sorted. The optical sorting apparatus according to claim 7.

The invention according to claim 9 of the present application is a paddy sorting machine provided with the optical sorting device according to any one of claims 1 to 8.

According to the present invention, the slit for optical inspection is not provided with a light-transmitting plate, and dust or the like generated from the object to be sorted flowing down the surface of the chute does not enter the back side of the chute. It is possible to prevent dust and the like from easily adhering to the equipment, and in particular, to prevent dust from adhering to the rear side optical inspection unit and significantly deteriorating the performance, resulting in sorting errors.
Further, since the air curtain prevents the intrusion of dust and the like, the translucency is not lost unlike the one blocked by the translucent plate.
For a light-transmitting plate that transmits light, it is necessary to interrupt the sorting operation when removing dust and the like, but according to the present invention, such a situation does not occur.

In addition, since the slit air nozzle is arranged so that the air of the air curtain is ejected from the upstream side to the downstream side of the chute, the air of the air curtain is temporarily discharged from the slit for optical inspection to the surface side of the chute. Even in this case, the influence on the flow of the material to be sorted can be reduced.

In addition, the ejector portion has an ejector nozzle capable of ejecting air to the object to be sorted on the downstream side of the slit for optical detection, and an exhaust portion is provided on the downstream side of the air curtain ejected from the air nozzle for slitting. Since the surface of the exhaust air section facing the slit air nozzle is inclined to the downstream side as it is separated from the optical detection slit, the air of the air curtain should flow out from the optical inspection slit to the surface side of the chute. It flows efficiently toward the exhaust part. Therefore, it does not affect the air ejection of the ejector nozzle arranged on the downstream side.

In addition, the rear optical inspection unit includes a rear translucent plate that blocks the flow of air between the slit air nozzle and at least one of the illumination unit and the light receiving unit of the rear optical inspection unit. Therefore, the rear side optical inspection unit can be protected from dust and the like.

In addition, the rear optical inspection unit is provided with an air nozzle for the rear translucent plate that can form an air curtain that prevents dust and the like from adhering to the rear translucent plate on the slit side of the rear translucent plate. Therefore, it is possible to prevent dust and the like from adhering to the rear light transmitting plate.

In addition, the rear optical inspection unit includes a rear translucent plate that blocks the flow of air between the slit air nozzle and at least one of the illumination unit and the light receiving unit of the rear optical inspection unit. , The air nozzle for the slit of the rear translucent plate is provided with an air nozzle for the rear translucent plate that can form an air curtain that prevents dust and the like from adhering to the rear translucent plate. An exhaust part is provided on the downstream side of the air curtain that blows out from the air nozzle, and the exhaust part also exhausts the air curtain that blows out from the slit air nozzle. Can be done.

In addition, the optical inspection unit receives at least one of the illumination unit that irradiates the light toward the optical detection slit and the transmitted light and the reflected light from the light sorting unit that is irradiated by the illumination unit. In addition to having a unit, at least one of the illumination unit and the light receiving unit has a front side optical inspection unit arranged on the surface side of the chute, and the front side optical inspection unit has a chute and a front side optical inspection. A front light-transmitting plate that blocks the flow of air is provided between the lighting part and the light-receiving part of the unit, and dust or the like is collected on the front light-transmitting plate on the shoot side of the front light-transmitting plate. Since an air nozzle for the front translucent plate that can form an air curtain that prevents adhesion is provided, the front side optical inspection part should be protected from dust, etc., and dust, etc. should be prevented from adhering to the front translucent plate. Can be done.

In addition, since the air nozzle for the front light transmitting plate is arranged so that the air curtain to be formed is ejected so as to be gradually separated from the flow direction of the object to be sorted, it affects the flow of the chute of the object to be sorted. Never give.

Sectional drawing of the sorting part which concerns on 1st Embodiment of this invention. The perspective view of the chute which concerns on 1st Embodiment of this invention. FIG. 3 is a cross-sectional view of an optical sorting device showing a first embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of a main part of an optical sorting device showing a first embodiment of the present invention. FIG. 2 is a cross-sectional view of an optical sorting device showing a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Needless to say, the present invention is not limited to the embodiments.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 is a cross-sectional view of the sorter according to the first embodiment, FIG. 2 is a perspective view of a chute according to the first embodiment, and FIG. 3 is a perspective view of the optical sorter according to the first embodiment. It is a cross-sectional view, and FIG. 4 is an enlarged cross-sectional view of a main part of the optical sorting apparatus according to the first embodiment.

In the first embodiment, as shown in FIG. 1, an optical sorting device 1 is mounted on a sorting section of a paddy sorting machine (not shown). The sorting unit 2 is a secondary sorting unit installed adjacent to the downstream side of the paddy sliding portion (not shown).
Rice husks and brown rice are separated from the rice husks at the rice husk part, and the rice husks are first sorted. The mixed grains (objects to be sorted) made of brown rice that still contain foreign substances such as rice husks that have been first sorted are sent to the sorting unit 2, and only the foreign substances are sorted and removed from the mixed grains by the optical sorting device 1.

At the lower part of the sorting unit 2, a raw material hopper 3 to which mixed grains are sent from the padding unit is provided. A storage tank 4 is installed above the sorting unit 2 and above the optical sorting device 1. The mixed grains sent to the raw material hopper 3 are transported to the storage tank 4 by the fried grain unit 5.

The mixed particles transported to the storage tank 4 are supplied to the upper end of the chute 6 via the rotary valve 9. Below the chute 6, a brown rice discharge path 10 for discharging brown rice that is not excluded by the ejector portion 8 of the optical sorting device 1 is connected. A foreign matter discharge path 11 for discharging the foreign matter excluded by the ejector portion 8 of the optical sorting device 1 is also connected below the chute 6.

The optical sorting device 1 includes an inclined chute 6 in which mixed particles flow down the surface. The optical sorting device 1 includes an optical inspection unit 7 that performs an optical inspection on the mixed particles flowing down the surface of the chute 6. The optical sorting device 1 includes an ejector unit 8 that discriminates between foreign substances in mixed grains and brown rice based on the inspection results of the optical inspection unit 7 and removes only the foreign substances from the mixed grains.
On the back surface of the chute 6, a box 6a for storing a signal processing board (not shown), a solenoid valve drive circuit board, a power supply, and the like is attached.

As shown in FIG. 2, the chute 6 is formed with an optical detection slit 12 orthogonal to the flow direction of the mixed particles. In the chute 6, a slit 13 for sorting and removing is formed on the downstream side of the slit 12 for optical detection at right angles to the flow direction of the mixed particles. The optical detection slit 12 and the sorting / removing slit 13 are formed at close positions.
The widths of the optical detection slit 12 and the sorting / removing slit 13 are set according to the size and weight of the mixed particles flowing down the chute 6, the removing ability of the ejector portion 8, and the like.

As shown in FIG. 3, the optical inspection unit 7 includes a rear side optical inspection unit 7a and a front side optical inspection unit 7b installed at positions sandwiching the optical detection slit 12 on the back surface side and the front surface side of the chute 6. Be prepared.

The rear side optical inspection unit 7a includes a rear side illumination unit 14a such as an LED, a rear side light receiving unit 15a such as a CCD camera, and a rear side background illumination unit 16a for facing the front side optical inspection unit 7b. The rear side optical path 17a having the reflector 17a1 and the lens 17a2 is provided, and is housed in the rear side housing 18.

As shown in FIGS. 3 and 4, the rear side housing 18 is formed with a rear side opening 20 through which light passes. The rear side housing 18 is attached to the back surface side of the chute 6 so that the rear side opening 20 matches the optical detection slit 12.
The rear side opening 20 is formed so as to extend over the entire length of the optical detection slit 12 in the width direction, and the light emitted from the rear side illumination portion 14a passes through the rear side opening 20 and the optical detection slit 12 and is an optical detection slit. The granules (foreign matter a or brown rice b) passing over the 12 are irradiated.

As shown in FIG. 4, the ejector nozzle 21 of the ejector portion 8 is incorporated in the rear housing 18. The tip 21a of the ejector nozzle 21 is exposed to the outer surface of the rear housing 18 on the downstream side of the chute 6 from the rear opening 20 and faces the sorting / removing slit 13. Specifically, the tip 21a of the ejector nozzle 21 projects from the back surface of the chute 6 of the rear housing 18 to form a positioning protrusion.
By inserting the tip 21a of the ejector nozzle 21 which is a positioning protrusion into the sorting / removing slit 13, the rear housing 18 to which the ejector portion 8 is attached is positioned with respect to the chute 6.

As shown in FIGS. 3 and 4, in the rear side housing 18, an air chamber 22 to which air is supplied via the air supply pipe 22'is formed on the upstream side of the chute 6 of the rear side opening 20. An air nozzle 23 for slits that ejects air from the air chamber 22 toward the rear opening 20 is provided. The air curtain 25 can be formed by the air ejected from the slit air nozzle 23.

The exhaust air portion 24 is formed to open to the outside of the rear side housing 18 on the downstream side of the air curtain 25 ejected from the slit air nozzle 23 on the downstream side sandwiching the rear side opening 20 of the rear side housing 18. There is.
An efficient air curtain 25 is formed by the air ejected from the slit air nozzle 23 and discharged from the air exhaust portion 24. As a result, it is possible to prevent dust and the like from entering the rear side optical inspection unit 7a from the optical detection slit 12.

The air in the air curtain 25 is arranged so as to be ejected from the upstream side to the downstream side of the chute 6 on the back surface side of the optical detection slit 12. As a result, even if the air in the air curtain 25 comes out from the optical detection slit 12 to the surface side of the chute 6, the influence on the flow of the mixed particles can be reduced.

As shown in FIG. 4, the surface 24a of the exhaust air portion 24 facing the slit air nozzle 23 is inclined to the downstream side as the distance from the optical detection slit 12 increases. Therefore, the air curtain 25 ejected from the slit air nozzle 23 hits the facing surface and is efficiently guided to the exhaust port of the air exhaust portion 24. Therefore, the air of the air curtain 25 does not flow out from the optical detection slit 12 to the surface side of the chute 6, but flows toward the discharge port of the air exhaust portion 24. Therefore, it does not affect the air ejection of the ejector nozzle 21 arranged on the downstream side.

The rear side housing 18 is further fixed by engaging a claw with the back surface of the chute 6 or by a fixing tool such as a screw.

As shown in FIG. 3, the front side optical inspection unit 7b is a front side back for facing the front side illumination unit 14b such as an LED, the front side light receiving unit 15b such as a CCD camera, and the rear side optical inspection unit 7a. It includes a ground illumination unit 16b and a front side optical path 17b having a plurality of reflectors 17b1 and lenses 17b2, and is housed in the front side housing 26.

The front side housing 26 is formed with a front side opening 27 through which light passes. The front side housing 26 is installed on the surface side of the chute 6 so that the front side opening 27 matches the optical detection slit 12.
The front side opening 27 is formed so as to extend over the entire length in the width direction of the chute 6, and the light emitted from the front side illumination unit 14b passes through the front side opening 27 and on the optical detection slit 12 (granular matter (). The foreign matter a or brown rice b) is irradiated.

The light from the rear side illumination unit 14a is irradiated from the back surface side to the granules passing over the optical detection slit 12 through the rear side opening 20 of the rear side housing 18 and the optical detection slit 12. The light from the front side illumination unit 14b is irradiated from the surface side to the particles passing over the optical detection slit 12 through the front side opening 27 of the front side housing 26.
The light reflected by the granular material and the light transmitted through the granular material travel to the inside of the rear side housing 18 and the front side housing 26 through the rear side opening 20 and the front side opening 27, and travel to the rear side optical path 17a and the front side light. Light is received by the rear light receiving unit 15a and the front light receiving unit 15b via the path 17b.

The light-receiving signals received by the rear-side light-receiving unit 15a and the front-side light-receiving unit 15b are sent to a signal processing board (not shown) housed in the box 6a. In the signal processing substrate, the signal level of the received signal and the threshold value are compared, and it is determined whether the granular material is the foreign matter a or the brown rice b.
The discrimination result by the signal processing board is transmitted to a valve drive circuit board (not shown) housed in the box 6a. The valve drive circuit board controls the opening and closing of an electromagnetic valve (not shown) of the ejector unit 8.

When it is determined that the granular material is the foreign matter a, when the granular material passes through the sorting / removing slit 13, high-pressure air is ejected from the ejector nozzle 21 selected by the opening / closing control of the solenoid valve. Foreign matter a is removed from the surface of the chute 6 by the high-pressure air ejected from the ejector nozzle 21. The excluded foreign matter a is discharged through the foreign matter discharge path 11.
The granules of brown rice b that have not been excluded are sent to the next step through the brown rice discharge channel 10.

Dust and the like generated from the mixed particles flowing down the surface of the chute 6 do not enter the back surface side of the chute 6 because the optical detection slit 12 is blocked by the air curtain 25, and pass through the rear side opening 20 to the rear side. It does not adhere to the rear side optical inspection unit 7a in the housing 18.

[Second Embodiment]
Hereinafter, a second embodiment according to the present invention will be described with reference to FIG. The same parts as those in the first embodiment will be omitted, and different parts will be mainly described.

In the second embodiment, the rear side optical inspection unit 7a is located between the slit air nozzle 23 and the rear side illumination unit 14a, the rear side background illumination unit 16a, the rear side optical path 17a, and the rear side light receiving unit 15a. It is provided with a rear translucent plate 28 that blocks the flow of air.
Specifically, inside the rear side housing 18, a rear light transmitting plate 28 is fitted in the back side of the rear side opening 20 so as to cross the internal space. The rear transmissive plate 28 blocks the rear side opening 20, the rear side illumination unit 14a of the rear side optical inspection unit 7a, the rear side background illumination unit 16a, the rear side optical path 17a, and the rear side light receiving unit 15a. There is.
As a result, the rear side optical inspection unit 7a is strictly protected even if dust or the like is blown by the air curtain 25.

The slit air nozzle 23 side, which is the chute 6 side of the rear light transmitting plate 28, is provided with the rear light transmitting plate air nozzle 29 on the upstream side. The air nozzle 29 for the rear light transmitting plate is provided so as to communicate with the air chamber 22. The rear light-transmitting plate air nozzle 29 is arranged so as to eject air along the rear light-transmitting plate 28, and the air can form an air curtain along the rear light-transmitting plate 28.
Therefore, it is possible to prevent dust and the like from adhering to the rear light transmitting plate 28.

This air curtain is discharged from the opening of the exhaust portion 24. In other words, the air exhaust portion 24 can exhaust the air of the air curtain ejected from the rear light transmitting plate air nozzle 29 and the air curtain 25 ejected from the slit air nozzle 23.
Therefore, the exhaust air section can be shared and a compact configuration can be obtained.

The front optical inspection unit 7b blocks the air flow between the chute 6 and the front side illumination unit 14b, the front side background illumination unit 16b, the front side optical path 17b, and the front side light receiving unit 15b. It is provided with a plate 30.
Specifically, the front light transmitting plate 30 is fitted in the front opening 27 of the front housing 26. The front light transmitting plate 30 blocks the front surface side of the chute 6, the front side lighting unit 14b, the front side background lighting unit 16b, the front side light path 17b, and the front side light receiving unit 15b.
As a result, dust and the like generated on the surface side of the chute 6 are prevented from entering the inside of the front side housing 26, and the front side optical inspection unit 7b is strictly protected.

An air nozzle 32 for the front light-transmitting plate is provided on the chute 6 side of the front light-transmitting plate 30 and on the upstream side. The front light transmitting plate air nozzle 32 is provided so as to communicate with the air chamber 31. An air supply pipe 31'is connected to the air chamber 31. The front light-transmitting plate air nozzle 32 is arranged so as to eject air along the front light-transmitting plate 30, and the air can form an air curtain along the front light-transmitting plate 30.
Therefore, it is possible to prevent dust and the like from adhering to the front light transmitting plate 30.

The forming direction of the air curtain formed by the front light transmitting plate 30 and the air nozzle 32 for the front light transmitting plate is provided so as to be gradually separated from the flowing direction of the mixed particles flowing down the chute 6. In other words, the space 33 between the front light transmitting plate 30 and the chute 6 is formed so as to become wider toward the downstream side. Therefore, the air curtain formed by the air nozzle 32 for the front light transmitting plate does not affect the flow of the chute of the mixed particles.
Further, the lower portion of the space 33 forms an exhaust portion of the air curtain formed by the air nozzle 32 for the front light transmitting plate.

[Other variants]
The present invention is not limited to the above embodiments. For example, the following are also included.

In the present embodiment, the optical sorting device sorts foreign substances such as rice husks and brown rice, but it can also be used for sorting other grains, beans, resin pellets and the like.

In the present embodiment, both the front side optical inspection unit and the rear side optical inspection unit are provided with a light source unit, an optical path, and a light receiving unit, respectively, but the present invention is not limited to this. For example, one may have a light source unit and the other may have only a light receiving unit.

In the present embodiment, air is ejected from the ejector nozzle installed on the back surface side of the chute to the front surface side of the chute through the sorting and removing slit, but the object to be sorted is released from the lower end of the chute without providing the sorting and removing slit. Air may be ejected, and in this case, air may be ejected from above to below.

In the present embodiment, the rear side optical inspection unit and the ejector nozzle are housed in the rear side housing, and the front side optical inspection part is housed in the front side housing. However, the rear side housing and the front side housing are not provided, and the inside thereof is not provided. The parts housed in the optics may be installed individually. In this case, a slit air nozzle forming an air curtain that shields the light detection slit is provided on the chute.

In the present embodiment, the positioning protrusion is provided so as to be inserted into the sorting / removing slit, but the present invention is not limited to this. It may be provided in the rear housing and inserted into the optical detection slit, or may be provided so as to be inserted into either of them.

In the present embodiment, when the rear housing is positioned on the chute, the positioning protrusion is inserted into the sorting / removing slit, but the present invention is not limited to this. For example, the rear housing can be attached by hooking a claw on a place other than the slit on the back of the chute, or by using a fixture such as a screw, but by matching the engagement position of the claw and the hole for inserting the fixture. , May be automatically aligned.

Each technical matter in any embodiment may be applied to other embodiments as an embodiment.

1 Optical sorting device 2 Sorting section 3 Raw material hopper 4 Storage tank 5 Grain frying section 6 Shoot 7 Optical inspection section 7a Rear side optical inspection section 7b Front side optical inspection section 8 Ejector section 9 Rotary valve 10 Brown rice discharge path 11 Foreign matter discharge path 12 Optical detection slit 13 Sorting and removal slit 14a Rear side illumination unit 14b Front side illumination unit 15a Rear side light receiving unit 15b Front side light receiving unit 16a Rear side background illumination unit 16b Front side background illumination unit 17a Rear side optical path 17b Front side optical path 18 Rear side housing 20 Rear side opening 21 Ejector nozzle 22 Air chamber 22'Air supply pipe 23 Slit air nozzle 24 Blower 25 Air curtain 26 Front side housing 27 Front side opening 28 Rear translucent plate 29 Rear Air nozzle for translucent plate 30 Front translucent plate 31 Air chamber 31'Air supply pipe 32 Air nozzle for front translucent plate 33 Space

Claims (9)

A chute that has a slit for optical detection and allows the object to be sorted to flow down the surface.
It has an illumination unit that irradiates light toward the optical detection slit, and a light receiving unit that receives at least one of the transmitted light and the reflected light of the light emitted by the illumination unit, and also includes the illumination unit and the above. An optical inspection unit in which at least one of the light receiving units has a rear side optical inspection unit arranged on the back surface side of the chute and inspects an object to be sorted flowing down the surface of the chute.
An ejector unit that sorts and removes the object to be sorted based on the inspection result of the optical inspection unit, and an ejector unit.
In the optical sorting device equipped with
An optical sorting apparatus characterized in that an air nozzle for a slit capable of forming an air curtain capable of forming an air curtain for preventing dust and the like from entering from the optical detection slit to the rear side optical inspection portion is provided on the back surface side of the chute. .. The optical sorting device according to claim 1, wherein the slit air nozzle is arranged so that air from the air curtain is ejected from the upstream side to the downstream side of the chute. The ejector unit has an ejector nozzle capable of ejecting air to the object to be sorted on the downstream side of the optical detection slit.
An exhaust part is provided on the downstream side of the air curtain that blows out from the slit air nozzle.
The optical sorting apparatus according to claim 2, wherein the surface of the exhaust air portion facing the slit air nozzle is inclined to the downstream side as the distance from the optical detection slit is increased. The rear-side optical inspection unit includes a rear light-transmitting plate that blocks air flow between the slit air nozzle and at least one of the illumination unit and the light-receiving unit of the rear-side optical inspection unit. The optical sorting apparatus according to any one of claims 1 to 3, wherein the optical sorting device is characterized by the above. The rear light-transmitting plate is provided with an air nozzle for a rear light-transmitting plate capable of forming an air curtain for preventing dust and the like from adhering to the rear light-transmitting plate on the slit air nozzle side. The optical sorting apparatus according to claim 4. The rear-side optical inspection unit includes a rear light-transmitting plate that blocks air flow between the slit air nozzle and at least one of the illumination unit and the light-receiving unit of the rear-side optical inspection unit. And
An air nozzle for a rear translucent plate capable of forming an air curtain for preventing dust and the like from adhering to the rear translucent plate is provided on the slit air nozzle side of the rear translucent plate.
An exhaust part is provided on the downstream side of the air curtain that is ejected from the air nozzle for the rear light transmitting plate.
The optical sorting device according to claim 3, wherein the exhaust unit also exhausts air from the air curtain ejected from the slit air nozzle. The optical inspection unit receives at least one of an illumination unit that irradiates light toward the optical detection slit and at least one of transmitted light and reflected light from the selection unit of the light emitted by the illumination unit. In addition to having a unit, at least one of the illumination unit and the light receiving unit has a front side optical inspection unit arranged on the surface side of the chute.
The front-side optical inspection unit includes a front light-transmitting plate that blocks air flow between the chute and at least one of the illumination unit and the light-receiving unit of the front-side optical inspection unit. ,
The claim is characterized in that an air nozzle for a front light-transmitting plate capable of forming an air curtain for preventing dust and the like from adhering to the front light-transmitting plate is provided on the chute side of the front light-transmitting plate. The optical sorting apparatus according to any one of items 1 to 6. The optical type according to claim 7, wherein the air nozzle for the front light transmitting plate is arranged so that the air curtain to be formed is ejected so as to be gradually separated from the flow direction of the object to be sorted. Sorting device. A paddy sorting machine comprising the optical sorting device according to any one of claims 1 to 8.

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