CN112534244B - Grain grade identification device - Google Patents

Abstract

The object of the present invention is to provide a grain grade discrimination device that can discriminate the appearance grade of grains placed on the sample tray with good accuracy by avoiding the projection of a light source on the bottom of a transparent sample tray. The present invention is a grain grade discrimination device that irradiates light onto grains placed on a sample tray having a transparent bottom surface, causes the light to penetrate the grains, and discriminates the appearance grade of the grains based on the penetrated light from the grains, and is characterized in that a lighting mechanism having a light source is disposed below the sample tray, and the lighting mechanism irradiates indirect light onto the grains placed on the sample tray. In the present invention, it is preferred that the lighting mechanism has a light source block disposed obliquely below the sample tray, the light source is disposed on the inner side of the light source block, and the lighting mechanism reflects the light from the light source on the inner side of the light source block, and irradiates the light from the light source onto the grains placed on the sample tray as indirect light from obliquely below.

Description

Grain grade identification device

Technical Field

The present invention relates to a grain grade determination device for determining the appearance grade of grains such as rice, wheat, beans, and corn. In particular, the present invention relates to a grain grade determination device comprising an illumination mechanism that prevents a light source from being projected onto the bottom of a sample tray, and which determines the appearance grade of grains placed on the sample tray with good accuracy.

Background Art

Conventionally, there is known a device for irradiating light onto grains, causing the light to penetrate the grains and/or reflect from the grains, and determining the appearance grade of the grains based on the penetrated light and/or reflected light from the grains (see Patent Documents 1 and 2).

Patent document 1 describes a device including a photographing mechanism, which is equipped with an upper photographing lighting unit, a lower lighting unit, and a tray on which a discrimination object, i.e., an arbitrary number of grains, is placed and arranged therebetween, and the device irradiates light from the upper light-emitting portion of the upper photographing lighting unit to the grains placed on the tray and photographs the reflected light thereof by the upper photographing lighting unit, or irradiates light from the lower light-emitting portion of the lower lighting unit to the grains and photographs the transmitted light thereof by the upper photographing lighting unit, thereby acquiring image data formed by the reflected light or the transmitted light from the grains.

In addition, Patent Document 2 describes a device comprising: a base member; a rotating member, which is rotatably arranged inside the base member and has a light source on one side; and a cover member, which is installed on the base member and constitutes an outer frame together with the base member, is located above the rotating member and has an opening for supporting a sample plate carrying grains, the sample plate carrying a plurality of grains is set in the opening of the cover member, and light is irradiated from obliquely below by the light source onto the transparent bottom surface of the sample plate, so that light penetrates the plurality of grains carried on the sample plate from obliquely below.

According to the device described in Patent Document 1, the appearance grade of the grains can be determined by comparing image data obtained by imaging means using reflected light or transmitted light from the grains with reference image data for grain inspection.

According to the device described in Patent Document 2, the operator can detect cracked rice by visually observing the presence or absence of shadows in the grains from above the sample pan.

However, the device described in Patent Document 1 places a tray on the lower light-emitting portion, which has the following problem: the lower light-emitting portion is projected on the bottom of the tray, affecting the image data of the grains obtained by the shooting mechanism, so that the appearance grade of the grains cannot be determined with good accuracy.

On the other hand, the device described in Patent Document 2 arranges the light source on the lower side of the sample tray and irradiates light to the bottom surface of the sample tray from obliquely below. However, if the light source is not arranged farther to the side of the sample tray, the following problem occurs: the light source is projected onto the bottom of the sample tray, which affects the visual observation of the grains by the operator above the sample tray, and thus the main cracked rice cannot be correctly detected.

Prior art literature

Patent Literature

Patent Document 1: Japanese Patent Application Publication No. 2015-7606

Patent Document 2: Japanese Patent Application Publication No. 2014-173884

Summary of the invention

Problems to be solved by the invention

Therefore, an object of the present invention is to provide a grain grade determination device that can determine the appearance grade of grains placed on a transparent sample pan with good accuracy by preventing a light source from being reflected on the bottom of the transparent sample pan.

Solutions for solving problems

In order to achieve the above-mentioned object, one embodiment of the present invention is a grain grade determination device, which irradiates light to grains placed on a sample plate having a transparent bottom surface, allows the light to penetrate the grains, and determines the appearance grade of the grains based on the transmitted light from the grains, wherein:

A lighting mechanism having a light source is arranged below the sample tray.

The lighting mechanism irradiates the grains placed on the sample pan with indirect light.

One embodiment of the present invention is preferably as follows.

The lighting mechanism has a light source block disposed obliquely below the sample plate, and the light source is disposed inside the light source block.

The lighting mechanism reflects the light from the light source inside the light source block and irradiates the light as indirect light from obliquely below onto the grains placed on the sample pan.

One embodiment of the present invention is preferably as follows.

The light source block comprises: a fixing portion for fixing the light source; a light guide portion located above the fixing portion and extending toward the center of the sample disk to block and reflect direct light (direct light) from the light source toward the bottom of the sample disk; and a reflecting portion located below the fixing portion for reflecting direct light from the light source or reflected light from the light guide portion.

The lighting mechanism reflects the light from the light source on the inner side surfaces of the respective parts of the light source block, and irradiates the light as indirect light from obliquely below onto the grains placed on the sample pan.

One embodiment of the present invention is preferably as follows.

A black reflective plate serving as a background is disposed below the sample disk, and the lighting mechanism is disposed adjacent to the outer side of the black reflective plate. The inner side surfaces of the respective parts of the light source block are white.

One embodiment of the present invention is preferably as follows.

The lighting mechanism is disposed in plurality at an angle below the sample pan, and irradiates the grains placed on the sample pan with the light from the light source as indirect light from a plurality of directions.

One embodiment of the present invention is preferably as follows.

A grain grade determination device as described above, wherein light is irradiated onto grains placed on a sample plate having a transparent bottom surface, the light is made to penetrate the grains and/or be reflected from the grains, and the appearance grade of the grains is determined based on the penetrated light and/or reflected light from the grains, wherein:

An upper lighting mechanism having an upper light source is disposed obliquely above the sample tray.

The upper lighting mechanism comprises: a fixing portion, fixing the upper light source; a lower light shielding portion, located below the upper light source, shielding the direct light from the upper light source toward the sample disk and reflecting it upward; an upper light shielding portion, located above the upper light source, shielding the direct light from the upper light source toward the upper side and the reflected light reflected by the lower light shielding portion and reflecting it downward;

The upper lighting mechanism reflects the light from the upper light source at each of the light shielding portions, and irradiates the light as indirect light from obliquely above onto the grains placed on the sample pan.

One embodiment of the present invention is preferably as follows.

The upper lighting mechanism is provided in plurality on the inner surface of the cylindrical body, and irradiates the grains placed on the sample pan from a plurality of directions with the light from the upper light source as indirect light.

One embodiment of the present invention is preferably as follows.

The light shielding portions are black, and on the other hand, the inner surface of the cylindrical body is white below the upper light shielding portion and black above the upper light shielding portion.

One embodiment of the present invention is preferably as follows.

A black light shielding plate is disposed above the upper light shielding portion and inside the cylindrical body. The black light shielding plate has a circular opening and has an aperture function for adjusting the amount of transmitted light and/or reflected light from the grains.

In the grain grade discrimination device according to one embodiment of the present invention, the illumination means irradiates the grains placed on the sample pan from below with the light from the light source as indirect light, and thus it is possible to avoid the light source being reflected on the bottom of the sample pan.

Therefore, according to the grain grade determination device of one embodiment of the present invention, it is possible to determine the appearance grade of the grains placed on the sample pan with high accuracy based on the transmitted light from the grains.

In addition, in a grain grade identification device according to one embodiment of the present invention, since the lighting mechanism uses the light from the light source as indirect light to illuminate the grains placed on the sample tray from below, there is no need to arrange the lighting mechanism laterally away from the center of the sample tray in order to avoid the light source being reflected on the bottom of the sample tray.

Therefore, according to the grain grade discrimination device of one embodiment of the present invention, it is possible to prevent the device from being enlarged in order to prevent the light source from being projected onto the bottom of the sample pan.

In a grain grade identification device according to one embodiment of the present invention, as long as the lighting mechanism has a light source block arranged obliquely below the sample tray, the light source is arranged on the inner side of the light source block, and the lighting mechanism reflects the light from the light source on the inner side of the light source block and irradiates the light from obliquely below to the grains placed on the sample tray as indirect light, the lighting mechanism can make the light from the light source indirect light through a simple structure.

Moreover, the grain grade discrimination device according to one embodiment of the present invention is suitable for detecting main body cracked grains and the like as long as light from a light source is irradiated from obliquely below onto grains placed on a sample pan.

In an embodiment of the grain grade identification device of the present invention, as long as the light source block includes: a fixing part for fixing the light source; a light guiding part located at the upper part of the fixing part and extending toward the center side of the sample pan, shielding and reflecting the direct light (direct light) from the light source toward the bottom of the sample pan; and a reflecting part located at the lower part of the fixing part, reflecting the direct light from the light source or the reflected light from the light guiding part, the lighting mechanism reflects the light from the light source on the inner side surfaces of the parts of the light source block and irradiates the light as indirect light from obliquely below to the grains placed on the sample pan, the light guiding part can be used to reduce the range in which the light source is projected on the bottom of the sample pan, so the device can be miniaturized.

In addition, in the grain grade discrimination device according to one embodiment of the present invention, since the lighting mechanism can guide most of the light from the light source to the reflecting portion of the light source block, effective use of light can be achieved.

The grain grade discrimination device of one embodiment of the present invention can be effectively applied by effectively reflecting the light of the light source through the white inner side surface of each part of the light source block as long as a black reflector serving as a background is arranged below the sample plate, and the lighting mechanism is arranged adjacent to the outer side of the black reflector, and the inner side surface of each part of the light source block is white. In addition, most of the light incident from the lighting mechanism to the black reflector serving as the background is indirect light, so that the light source can be prevented from being reflected from the black reflector and projected onto the bottom of the sample plate.

In a grain grade identification device according to one embodiment of the present invention, as long as a plurality of the above-mentioned lighting mechanisms are arranged obliquely below the above-mentioned sample tray, and the light from the above-mentioned light source is irradiated as indirect light from multiple directions to the grains placed on the above-mentioned sample tray, the main broken grains, etc. can be detected with good accuracy regardless of the orientation of the grains.

In a grain grade identification device according to one embodiment of the present invention, as long as the upper lighting mechanism reflects the light from the upper light source at the lower shading portion and the upper shading portion, and irradiates the light as indirect light from obliquely above to the grains placed on the sample tray, the upper light source can be prevented from being reflected on the sample tray.

Therefore, according to the grain grade determination device of one embodiment of the present invention, the appearance grade of the grains placed on the sample tray can be determined with high accuracy based on the transmitted light and/or reflected light from the grains.

In addition, in a grain grade identification device according to one embodiment of the present invention, as long as the upper lighting mechanism reflects the light from the upper light source at each shading portion and irradiates the light as indirect light from obliquely above to the grains placed on the sample tray, there is no need to arrange the upper lighting mechanism laterally away from the center of the sample tray in order to avoid the upper light source being reflected on the bottom of the sample tray.

Therefore, according to the grain grade discrimination device of one embodiment of the present invention, it is possible to prevent the device from being enlarged in order to prevent the light source from being projected onto the bottom of the sample pan.

In a grain grade identification device according to one embodiment of the present invention, as long as a plurality of the upper lighting mechanisms are provided on the inner surface of the cylinder, and the light from the upper light source is irradiated as indirect light from multiple directions to the grains placed on the sample tray, the appearance grade of the grains can be identified with good accuracy regardless of their orientation.

In the grain grade discrimination device of one embodiment of the present invention, as long as each of the above-mentioned shading parts is black, and on the other hand, the inner surface of the above-mentioned cylinder body below the above-mentioned upper shading part is white and above the above-mentioned upper shading part is black, the light of each of the above-mentioned upper light sources can be effectively used through the white inner surface of the above-mentioned cylinder body below the above-mentioned upper shading part. In addition, the present invention obtains an image of the grains placed on the sample tray from above the above-mentioned cylinder body, but because the light of each of the above-mentioned upper light sources can be prevented from being circumvented into the upper part of the above-mentioned cylinder body by the black inner surface above the above-mentioned upper shading part, a clear image of the above-mentioned grains can be obtained.

The grain grade discrimination device of one embodiment of the present invention can obtain a clear image of the grain when obtaining an image of the grain placed on the sample tray from above the cylinder body, as long as a black light shielding plate having a circular opening and having an aperture function for adjusting the amount of light transmitted from the grain and/or reflected light is arranged above the upper light shielding portion and inside the cylinder body. In addition, the range in which the image of the grain placed on the sample tray can be obtained can be adjusted by changing the size of the opening of the black light shielding plate, thereby effectively preventing the light source or the upper light source from being projected on the bottom of the sample tray.

Effects of the Invention

The present invention provides a grain grade determination device that can determine the appearance grade of grains placed on a sample tray with good accuracy by preventing a light source from being reflected on the bottom of a transparent sample tray.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic explanatory diagram of a grain grade classification device.

FIG. 2 is an explanatory diagram of the lower lighting mechanism.

FIG3 is a cross-sectional view taken along line A-A in FIG2 .

FIG. 4 is an explanatory diagram of the upper lighting mechanism.

FIG5 is a cross-sectional view taken along line B-B in FIG4.

FIG. 6 is an explanatory diagram of another example of the lower lighting mechanism.

FIG. 7 is a schematic diagram for explaining another grain grade discrimination device.

FIG. 8 is a schematic explanatory diagram of a modified example of the grain grade discrimination device of FIG. 1 .

DETAILED DESCRIPTION

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic explanatory diagram of a grain grade classification device according to an embodiment of the present invention.

The grain grade discrimination device 1 shown in FIG. 1 includes a lower lighting storage unit 2 and an upper lighting cylinder 3 .

The lower lighting storage section 2 has a rectangular space in a plan view, and stores the lower lighting mechanism 20 along the side surface. Here, an example in which two sets of the lower lighting mechanism 20 are stored is shown.

A circular opening 24 is provided at the center of the upper portion of the lower lighting storage section 2, and a circular transparent basin 4 formed of a transparent material is placed on the opening 24. In addition, a black reflection plate 23 serving as a background is provided at the bottom of the lower lighting storage section 2 and below the transparent basin 4.

The lower lighting mechanism 20 is disposed obliquely below the transparent bowl (a sample tray having a transparent bottom) 4, and irradiates light to the grains placed in the transparent bowl 4 from obliquely below.

The lower lighting mechanism 20 may be disposed directly below the transparent basin 4 as shown in Fig. 8 described later. In this case, the lower lighting mechanism 20 is formed of a member of the same color as the black reflector 23 and functions as a background.

The upper lighting cylinder 3 is cylindrical in shape, and is disposed on the upper portion of the lower lighting housing portion 2 so as to be concentric with the opening 24 .

An upper lighting mechanism 30 is provided on the inner surface of the upper lighting cylinder 3. Here, four sets of upper lighting mechanisms 30 (one set is omitted in the illustration) are provided along the circumferential direction.

The upper portion of the upper lighting cylinder 3 is closed by a cover 34 , and image data of the grains placed on the transparent basin 4 is acquired by an image acquisition mechanism (sensor) 5 such as a camera through an opening 35 provided at the center of the cover 34 .

The upper lighting mechanism 30 is disposed obliquely above the transparent bowl 4 and irradiates light to the grains placed in the transparent bowl 4 from obliquely above.

Fig. 2 is an explanatory diagram of the lower lighting mechanism, and shows a light source block. Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2 .

The lower lighting mechanism 20 comprises a lower light source 21 and a long strip-shaped light source block 22 .

The light source block 22 comprises: a fixing portion 221 fixing the lower light source 21; and a light guiding portion 222 located at the upper front end of the fixing portion 221 and extending toward the center side of the transparent basin 4, shielding the direct light (direct light) from the lower light source 21 toward the bottom of the transparent basin 4 and reflecting it downward.

In addition, the light source block 22 has a reflecting portion 223 located below the fixing portion 221 , with an upper surface inclined downward toward the center of the transparent basin 4 to reflect direct light from the lower light source 21 or reflected light from the light guide portion 222 .

The lower lighting mechanism 20 reflects the light from the lower light source 21 at the respective portions of the light source block 22 , and irradiates the grains placed in the transparent basin 4 from obliquely below from the reflecting portion 223 or via the black reflecting plate 23 as indirect light.

The lower lighting mechanism 20 can reduce the range where the lower light source 21 is projected on the bottom of the transparent basin 4 through the light guide 222, thereby contributing to miniaturization of the device.

In addition, the lower lighting mechanism 20 may guide most of the light from the lower light source 21 to the reflective portion 223 of the light source block 22 , thereby achieving effective use of light.

Here, the inner side surfaces of the fixing portion 221 , the light guiding portion 222 , and the reflecting portion 223 of the light source block 22 are white.

Furthermore, the lower lighting mechanism 20 is disposed adjacent to the outer side of the black reflection plate 23 at the bottom of the lower lighting storage section 2 .

The lower lighting mechanism 20 may effectively reflect the light of the lower light source 21 through the white inner side surfaces of the respective parts of the light source block 22 and may be effectively used.

In addition, since most of the light incident on the black reflector 23 from the lower lighting mechanism 20 is indirect light, it is possible to avoid the lower light source 21 being reflected on the bottom of the transparent basin 4 due to reflection from the black reflector 23 .

The lower lighting mechanism 20 only needs to include one or more lower light sources 21 . If a plurality of lower light sources 21 are included, they only need to be fixed in a straight line in the long side direction of the light source block 22 .

In addition, although the lower light source 21 uses an LED (light emitting diode) light source, a light source other than an LED light source may be used.

Furthermore, the lower lighting mechanism 20 irradiates the light from the lower light source 21 to the grains placed in the transparent bowl 4 from obliquely below, and is therefore suitable for detecting main body cracked grains and the like.

Fig. 4 is an explanatory diagram of the upper lighting mechanism. Fig. 5 is a cross-sectional view taken along the line B-B in Fig. 4 .

The upper lighting mechanism 30 includes an upper light source 31 , a lower light shielding block 32 fixed to the inner surface of the upper lighting cylinder 3 , and an upper light shielding block 33 .

The lower shading block 32 comprises: a fixing portion 321 fixing the upper light source 31; and a lower shading portion 322 which is L-shaped and disposed at the lower portion of the fixing portion 321 and blocks direct light from the upper light source 31 toward the transparent basin 4 and reflects it upward.

The lower light shielding block 32 is fixed to the inner surface of the upper lighting cylinder 3 at the fixing portion 321 .

The upper light shading block 33 comprises an upper light shading portion 331, which is arranged to be placed or fixed above the upper light source 31 and the fixing portion 321 of the lower light shading block 32, to block direct light (direct light) directed upward from the upper light source 31, and reflected light reflected by the lower light shading portion 322 and reflected downward.

Here, the upper light shielding block 33 is a single annular member having a circular opening at the center and is common to the four upper lighting mechanisms 30 , but may be a member different from each upper lighting mechanism 30 .

The upper lighting mechanism 30 utilizes the shading portions 322 and 331 of the lower shading block 32 and the upper shading block 33 to reflect the light from the upper light source 31, and irradiates the light as indirect light from obliquely above to the grains placed in the transparent basin 4, thereby preventing the upper light source 31 from being reflected on the bottom of the transparent basin 4.

Here, the lower light shielding block 32 and the upper light shielding block 33 are black.

In addition, the inner surface of the upper lighting cylinder 3 is white below the lower surface of the upper light shielding block 33 (upper light shielding portion 331 ), and is black above the lower surface of the upper light shielding block 33 (upper light shielding portion 331 ).

The upper lighting mechanism 30 can effectively utilize the light of each upper light source 31 through the white inner surface of the upper lighting cylinder 3 which is below the lower surface of the upper light shielding block 33 .

In addition, although the image data of the grains placed on the above-mentioned transparent basin 4 is acquired from above the above-mentioned upper lighting cylinder 3 through the opening 35 provided in the center of the above-mentioned cover body 34 and by an image acquisition mechanism 5 such as a camera, the light of the above-mentioned upper light sources 31 can be prevented from being circumvented into the upper part of the above-mentioned upper lighting cylinder 3 by the black inner surface which is above the lower surface of the above-mentioned upper side shading block 33, so clear image data of the above-mentioned grains can be acquired.

Furthermore, the upper lighting cylinder 3 is in a cylindrical shape, but may be in a square cylindrical shape such as a quadrangular cylindrical shape.

In addition, although the upper light source 31 uses an LED (light emitting diode) light source, a light source other than an LED light source may be used.

The operation of the grain grade classification device in the embodiment of the present invention will be described.

First, the transparent bowl 4 on which the grains are placed is installed so as to be located on the opening 24 provided in the center of the upper portion of the lower lighting storage section 2 .

Secondly, in the lower lighting mechanism 20 and/or the upper lighting mechanism 30, the LEDs of the lower light source 21 and/or the upper light source 31 are respectively lit, and the light is irradiated to the above-mentioned grains placed in the above-mentioned transparent basin 4, so that the light penetrates the above-mentioned grains and/or is reflected by the above-mentioned grains.

Then, the transmission image and/or reflection image of the grain placed in the transparent bowl 4 is acquired by the image acquisition mechanism 5 through the opening 35 provided in the cover 34 of the upper lighting cylinder 3 .

The grain grade identification device 1 extracts shape information such as outer shape, area, length, width, and the like, color (color information (R, G, B), milky white, etc.), main body rupture, and the like based on the above-obtained penetration image through a microcomputer not shown in the figure, and further extracts shape information such as outer shape, area, length, width, and the like based on the above-obtained reflection image, and then identifies the appearance grade of the grains based on the extracted shape information and optical information.

The lower lighting mechanism 20 irradiates the grains placed in the transparent bowl 4 from obliquely below with the light from the lower light source 21 as indirect light, so that the lower light source 21 is prevented from being reflected on the bottom of the transparent bowl 4 .

Furthermore, since the upper lighting mechanism 30 irradiates the grains placed in the transparent bowl 4 from obliquely above with the light from the upper light source 31 as indirect light, it is possible to prevent the upper light source 31 from being reflected on the bottom of the transparent bowl 4 .

Therefore, according to the grain grade discrimination device 1, the appearance grade of the grains placed in the transparent bowl 4 can be discriminated with high accuracy based on the transmitted light and/or reflected light from the grains.

The lower lighting mechanism 20 of the grain grade identification device 1 uses the light from the lower light source 21 as indirect light to illuminate the grains placed in the transparent basin 4 from obliquely below, so there is no need to arrange the lower lighting mechanism 20 laterally away from the center of the transparent basin 4 in order to avoid the lower light source 21 being reflected on the bottom of the transparent basin 4.

In addition, the upper lighting mechanism 30 of the grain grade identification device 1 uses the light from the upper light source 31 as indirect light to illuminate the grains placed in the transparent basin 4 from obliquely above, so there is no need to arrange the upper lighting mechanism 30 laterally away from the center of the transparent basin 4 in order to avoid the upper light source 31 being reflected on the bottom of the transparent basin 4.

Therefore, according to the grain grade discrimination device 1 described above, it is possible to prevent the device from being enlarged in order to prevent the lower light source 21 and the upper light source 31 from being projected onto the bottom of the transparent bowl 4.

In addition, the grain grade identification device 1 may be provided with a black shading plate above the upper shading block 33 and inside the upper lighting cylinder 3, wherein the black shading plate has a circular opening and an unillustrated aperture function for adjusting the amount of penetrating light and/or reflected light from the grains.

In the grain grade discrimination device 1, as long as the black shading plate with an aperture function is provided inside the upper lighting cylinder 3, a clear image of the grain can be obtained when the penetration image and/or reflection image of the grain placed in the transparent basin 4 is obtained through the opening 35 provided in the cover 34 of the upper lighting cylinder 3 and the image acquisition mechanism 5. In addition, the range in which the image of the grain placed in the transparent basin 4 can be obtained can be adjusted by changing the size of the opening of the black shading plate with an aperture function, thereby effectively preventing the lower light source 21 or the upper light source 31 from being projected on the bottom of the transparent basin 4.

In the above-mentioned embodiment of the present invention, the case where the grain grade discrimination device 1 accommodates two sets of lower lighting mechanisms 20 in the above-mentioned lower lighting storage section 2 is taken as an example, but it is sufficient to accommodate at least one set of lower lighting mechanisms 20. In addition, in the case where four sets of lower lighting mechanisms 20 are accommodated in the above-mentioned lower lighting storage section 2 at equal intervals of 90 degrees, if the light sources of the four sets of the above-mentioned lower lighting mechanisms 20 are sequentially lit to obtain each penetration image, or the light sources of the four sets of the above-mentioned lower lighting mechanisms 20 are simultaneously lit to obtain the penetration image, it is possible to detect the main body cracked grains and the like with good accuracy regardless of the orientation of the grains.

FIG. 6 is an explanatory diagram of another example of the lower lighting mechanism, showing a cross-sectional view of a light source block.

The lower lighting mechanism 20 shown in FIG. 6 is different from the lower lighting mechanism 20 shown in FIG. 2 and FIG. 3 in that the upper surface of the reflecting portion 223 of the light source block 22 is substantially parallel to the bottom of the lower lighting storage portion 2 .

The lower lighting mechanism 20 shown in Figure 6 is also the same as the lower lighting mechanism 20 shown in Figures 2 and 3. It reflects the light from the lower light source 21 on the inner side of the above-mentioned light source block 22, and irradiates the grains placed in the transparent basin 4 from obliquely below as indirect light via the above-mentioned reflecting part 223 or the black reflecting plate 23.

FIG. 7 is a schematic explanatory diagram showing a grain grade classification device according to another embodiment of the present invention.

The grain grade discrimination device 101 shown in FIG. 7 is different from the grain grade discrimination device 1 shown in FIG. 1 in that it includes a lower lighting storage unit 2 and only includes a lower lighting mechanism 20 but does not include an upper lighting cylinder.

The grain grade discrimination device 101 shown in FIG. 7 is similar to the device described in Japanese Patent Application Laid-Open No. 2014-173884, and is suitable for use in visual inspection of main body cracked rice and the like.

The grain grade identification device 101 shown in Figure 7 also uses the light from the lower light source 21 as indirect light to illuminate the grains placed in the transparent basin 4 from obliquely below, thereby avoiding the lower light source 21 from being reflected on the bottom of the transparent basin 4, and can identify the appearance grade of the grains with good accuracy based on the penetrating light from the grains.

FIG. 8 is a schematic explanatory diagram showing a modified example of the grain grade discrimination device shown in FIG. 1 .

The grain grade discrimination device 1 shown in FIG8 is different from the grain grade discrimination device shown in FIG1 in that the lower lighting mechanism 20 is arranged directly below the transparent basin 4. In this case, the lower lighting mechanism 20 is configured to store a light source block 22, such as a circular cup-shaped light source block 22, on the inside of which the lower light source 21 is fixed, in an inverted state in the lower lighting storage section 2, and the outer side surface of the light source block 22 is set to black to function as a background. The lower lighting storage section 2 may also be a circular space in a top view.

In the grain grade identification device 1 shown in Figure 8, the lower lighting mechanism 20 reflects the light from the lower light source 21 at the light source block 22 and the inner surface of the lower lighting storage section 2, and irradiates the grains placed in the transparent basin 4 from below as indirect light.

The grain grade determination device 1 shown in FIG. 8 can also prevent the lower light source 21 from being reflected on the bottom of the transparent basin 4, and thus can determine the appearance grade of the grains with good accuracy based on the transmitted light from the grains.

In addition, in the example shown in FIG. 8 , the upper lighting mechanism 30 is omitted, but the upper lighting mechanism 30 may be provided on the inner surface of the upper lighting cylinder 3 as in the grain grade discrimination device shown in FIG. 1 .

In addition, the grain grade discrimination device 1 shown in FIG. 8 may not be provided with the upper illumination cylinder 3 similarly to the grain grade discrimination device 101 shown in FIG. 7 .

The grain grade determination device in the embodiment of the present invention is not limited to determining the appearance grade of rice grains, and can be used to determine the appearance grade of various grains.

The present invention is not limited to the above-described embodiment, and its configuration can of course be modified appropriately without departing from the scope of the invention.

The industrial applicability is as follows.

The grain grade determination device of the present invention can determine the appearance grade of the grains placed on the sample pan with good accuracy by preventing the light source from being reflected on the bottom of the transparent sample pan, and has excellent practicality.

Explanation of symbols

1—grain grade distinguishing device, 2—storage portion for lower lighting, 20—lower lighting mechanism, 21—lower light source (LED), 22—light source block, 221—fixing portion, 222—light guiding portion, 223—reflecting portion, 23—black reflecting plate (background), 24—opening, 3—cylinder for upper lighting, 30—upper lighting mechanism, 31—upper light source (LED), 32—lower light shielding block, 321—fixing portion, 322—lower light shielding portion, 33—upper light shielding block, 331—upper light shielding portion, 34—cover, 35—opening, 4—transparent basin, 5—image acquiring mechanism (sensor), 101—grain grade distinguishing device.

Claims (7)

1. A grain grade discriminating device for irradiating light to grains placed on a sample tray having a transparent bottom surface, causing the light to penetrate the grains, discriminating an appearance grade of the grains based on the penetrated light from the grains, characterized in that,

An illumination mechanism having a light source is disposed below the sample tray,

The illumination mechanism has a light source block disposed obliquely below the sample tray, and the light source is disposed inside the light source block,

The illumination means reflects light from the light source on the inner side of the light source block and irradiates the grain placed on the sample tray from obliquely below as indirect light to avoid the light source from showing on the transparent bottom surface of the sample tray,

The light source block includes: a fixing part for fixing the light source; a light guide part located at an upper part of the fixing part and extending toward a center side of the sample tray, and blocking and reflecting direct light from the light source toward a bottom of the sample tray; and a reflecting part which is positioned at the lower part of the fixing part and reflects the direct light from the light source or the reflected light from the light guiding part,

The illumination mechanism reflects light from the light source on the inner side surface of each part of the light source block, and irradiates grains placed on the sample tray from obliquely below as indirect light,

A black reflecting plate is disposed below the sample tray as a background, and the illumination means is disposed adjacent to the outside of the black reflecting plate, and the inner surfaces of the respective portions of the light source block are white.

2. The grain grade discrimination apparatus according to claim 1, wherein,

The illumination means is disposed obliquely below the sample tray and irradiates the grains placed on the sample tray with light from the light source as indirect light from a plurality of directions.

3. The grain grade discrimination apparatus according to claim 1, wherein,

The grain grade discriminating device irradiates light to grains mounted on a sample tray having a transparent bottom surface, transmits and/or reflects the light to the grains, discriminates the appearance grade of the grains based on the transmitted and/or reflected light from the grains,

An upper illumination mechanism having an upper light source is disposed obliquely above the sample tray,

The upper illumination mechanism includes: a fixing part for fixing the upper light source; a lower light shielding part located below the upper light source, blocking direct light from the upper light source toward the sample tray and reflecting the direct light upward; and an upper light shielding part located above the upper light source, shielding direct light from the upper light source to the upper direction and reflected light reflected by the lower light shielding part and reflecting downward,

The upper illumination mechanism reflects light from the upper light source at each of the light shielding portions, and irradiates grains placed on the sample tray obliquely upward as indirect light.

4. A grain grade discrimination apparatus according to claim 3, wherein,

The upper illumination means is provided in plural on the inner surface of the cylinder, and irradiates the grains placed on the sample tray with light from the upper light source as indirect light from plural directions.

5. The grain grade discrimination apparatus according to claim 4, wherein,

The light shielding portions are black, and the inner surface of the cylindrical body is white below the upper light shielding portion and black above the upper light shielding portion.

6. The grain grade discrimination apparatus according to claim 4, wherein,

A black light shielding plate is disposed above the upper light shielding portion and inside the cylindrical body, the black light shielding plate having a circular opening and adjusting the amount of transmitted light and/or reflected light from the grain.

7. The grain grade discrimination apparatus according to claim 5, wherein,

A black light shielding plate is disposed above the upper light shielding portion and inside the cylindrical body, the black light shielding plate having a circular opening and adjusting the amount of transmitted light and/or reflected light from the grain.