JPH0114829B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a photoelectric detection device for a color sorter that color sorts particles mixed with different colors.

Conventional technology Conventionally, the photoelectric detection device of a color sorter for grains (brown rice, etc.) irradiates a subject (such as particles mixed with different color grains) with white light having a broadband wavelength, and detects the transmitted light (or reflected light). The difference between the amount of light and the amount of light from the reference color plate is received and detected by a light receiving element, and the ejector device is actuated by a control signal of a control circuit into which the detection signal is input, scattering and sorting out the different color particles. However, when using this method to perform color sorting based on changes in the amount of transmitted light received from the subject, the amount of light received is small, and colored grains that need to be removed by color sorting may be removed. There is almost no difference in light intensity between the unneeded bluish, etc., sized grains, so both are judged as colored grains and are sorted out, which reduces product yield and reduces the number of injections by the injection nozzle device. There are problems such as an extremely large increase in grain size, which may lead to malfunctions, or re-selection of grains with a bluish tinge (raw green rice, etc.), resulting in a significant decrease in sorting efficiency. , there was a strong demand for improvements to the device.

Problems to be Solved by the Invention In view of the above-mentioned points, the present invention inputs reflected light and transmitted light respectively received from particles mixed with different color grains into each brightness/darkness determination section having a specific reference setting value, and By operating the injection nozzle device in response to each determination signal, color sorting is performed to determine and separate colored grains from the mixed particles excluding regular grains with a bluish tinge, etc., and thereby, A high-performance color sorting machine that moderately reduces the number of injections of the injection nozzle device to prevent the above-mentioned failures, and also eliminates the need to re-sort grains with a bluish tinge, greatly improving sorting efficiency. The purpose of the present invention is to provide a photoelectric detection device.

Means for Solving the Problems The present invention allows particles mixed with different colors to flow down from a downflow gutter, and a photoelectric detection device consisting of a light source, a light receiving element, and a reference color plate is provided around the trajectory of the flow, and a signal of the detection device is In the apparatus for color sorting by providing a jet nozzle device operated by a light source, the particles mixed with different colors are irradiated from a light source, the reflected light and the transmitted light are respectively received by a light receiving element, and the light receiving element for reflected light receives the light. A light/dark judgment section for reflected light that outputs when the light amount is equal to or higher than a first reference setting value for discriminating colored grains excluding regular grains with a bluish tinge, etc., and a light receiving element for transmitted light that outputs a light amount when the light amount of the light receiving element for transmitted light has a bluish tinge, etc. A light/dark judging section for transmitted light is provided which outputs an output when the light is equal to or less than a second reference setting value for discriminating colored grains excluding colored grains, and the injection nozzle device is actuated when both judging sections output. The above problem was solved by adopting a configuration in which:

Effect Particles mixed with different color particles flow down from the downflow gutter, and the light receiving element receives reflected light and transmitted light from the particles, and the amount of light received by the light receiving element for reflected light is determined by the light/dark judgment section for reflected light to be blueish. It is determined whether or not the grain size is equal to or higher than a first standard setting value set to distinguish colored grains other than regular grains that have a tinge of blue, etc. An output signal is output from the reflected light brightness determination section as colored grains excluding regular grains.

On the other hand, the transmitted light brightness/dark determination section determines whether the amount of light received by the light receiving element for transmitted light is less than or equal to a second reference setting value set for determining colored grains excluding regular grains with a bluish tinge. If it is less than the second reference setting value, the transmitted light brightness determination section outputs an output signal as colored grains excluding regular grains with a bluish tinge or the like.

Then, only when there is an output signal from both the brightness and darkness determining sections, the injection nozzle device is operated to produce colored grains, excluding sized grains (raw green rice, etc.) with a bluish tinge, that is, raw green rice. Other colored grains are separated by wind separation.

In this way, colored grains other than regular grains with a bluish tinge are identified in parallel using reflected light and transmitted light. Since the injection nozzle device is activated only when the grains are determined to be colored grains excluding regular grains with a bluish tinge, etc., the accuracy of distinguishing between the regular grains with a bluish tinge and other colored grains is improved. The injection nozzle device will no longer operate for particles with a bluish tinge, and the number of injections by the injection nozzle device will be reduced.

Embodiment The structure of the present invention will be explained based on FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a heat-insulating machine cylinder into which a downstream gutter 2 is inserted, and a photoelectric sorting chamber 3 is placed in the lower half of the machine cylinder 1.
In addition, a grain feeding device 4 is connected to the upper end of the machine cylinder 1 to integrally form a sorting machine, and in the grain feeding device 4, the upper half of the box frame 5 is formed into a supply hopper 6. A vibrating grain feeding gutter 8 equipped with a vibrating device 7 is installed at the bottom of the vibrating grain feeding gutter 8, and a light source 9 and a light-receiving gutter are installed in the photoelectric sorting chamber 3 around the flow trajectory A of the grain bundle flowing out from the gutter 2. A photoelectric detection device 12 consisting of an element 10 and a reference color plate 11 is provided, and an injection nozzle device 13 is arranged in relation to the inside of the machine cylinder 1 at the bottom thereof,
In addition, a grain collecting cylinder 14 is fixedly installed on the extension line of the flow path A, a unique grain discharge port 15 is provided at the lower end of the machine cylinder 1, and a control circuit 16 is provided on the side of the machine cylinder 1.
The machine frame 17 containing the machine frame 1 is fixed, and the machine frame 1
A support column 17A is provided at the bottom of 7 to integrally form a color sorter.

The photoelectric detection device 12 (see FIG. 2) converts the light receiving element 10 into a reflected light light receiving element 10A.
and a light receiving element 10B for transmitted light, as shown in FIG. 19, and the output side of each light/dark determining section 18, 19 is connected to the injection nozzle device 12. Further, the reflected light brightness/darkness determination section 18 is configured to convert the current/voltage converter 2
A comparator 23 is connected to the input side of the reflected light light receiving element 10A, and the output side of the current-voltage converter 20 is equipped with a setter 22 for setting the first reference set value _V1 via an amplifier 21. Connect to the input side of
In addition, the transmitted light brightness determination section 19 connects the transmitted light light receiving element 10B to the input side of the current voltage converter 24, and connects the output side of the current voltage converter 24 to the input side of the amplifier 25, The output side of the amplifier 25 is branched and one side is used as the second reference setting value.
Inverting comparator 2 with a setter 26 for setting V ₂
7 input side, and the other side is connected to the 3rd input side.
is connected to the input side of a comparator 29 with a setter 28 for setting the reference set value V ₃ of .
The output sides of 29 are connected to the input sides of an AND circuit 30, respectively. Also, the AND of the comparator 23 of the brightness determination unit 18 for reflected light and the brightness determination unit 19 for transmitted light
Each output side of the circuit 30 is connected to the input side of an AND circuit 31, and the output side of the AND circuit 30 is connected to an opening/closing solenoid valve 33 of the injection nozzle device 12 via a drive circuit 32. Next, a description will be given of the relationship between the state of change in the amount of light received (brightness) of various particles mixed in the object (for example, brown rice) and the reference setting values V ₁ , V ₂ , and V ₃ described above.

Figure 3 shows the distribution state of the amount of reflected light of various particles mixed in the subject (brown rice). Dead green rice and immature rice at the top of the diagram have a large amount of reflected light, followed by colored grains at the bottom. The amount of reflected light decreases in the order of , raw green rice, and brown rice, and the standard setting value shown in the diagram
_V1 can be clearly classified into colored grains, which are removed by color sorting, and brown rice, which is not removed, depending on the setting level.

Next, Figure 4 shows the distribution state of the amount of transmitted light of various particles mixed in the subject (brown rice). In the figure, dead green rice and immature rice on the upper side have a small amount of transmitted light, followed by those on the lower side. The amount of transmitted light increases in the order of colored grains, raw green rice, and brown rice, and the standard setting values shown in the diagram.
Among the colored grains that are color-sorted and removed according to the setting level, V ₂ selects grains with a bluish tinge on the grain surface (raw green rice, etc. that is not removed by color sorting) because the transmitted light is relatively low. It is possible to distinguish between colored grains that are detected in large quantities and transmit less light than this, and to clearly distinguish between colored grains, which are removed by color sorting, and regular grains and brown rice, which have a bluish tinge, which are not removed. Can be done.
Further, the reference setting value V ₃ shown in the figure can clearly distinguish between dead green rice and immature rice, which are not removed by color sorting, and colored grains, which are to be removed, depending on the setting level. Therefore, each of the reference setting values V ₁ , V ₂ , V ₃
Judgment signals from each brightness/darkness judgment section 18, 19, which are set appropriately, are sent to an AND circuit 30 and a drive circuit 3.
By inputting the input to the injection nozzle device 12 through 2 and activating it, colored grains are determined and separated, excluding regular grains with a bluish tinge (raw green rice, etc.) from particles mixed with different color grains, and brown rice is processed. It is possible to secure carefully selected brown rice that complies with the agricultural product standards regulations, including dead green rice, immature rice, etc.

The operation of the above configuration will be explained below.

The mixed particles (brown rice) flowing down from the supply hopper 6 to the vibrating grain feeding gutter 8 are transported by the vibration action of the vibrating device and flow down from the gutter end of the vibrating grain feeding gutter 8 into the downflow gutter 2, where they are mixed. The particles slide down the gutter 2 surface and flow down from the gutter end of the gutter 2 to the falling trajectory A in the photoelectric sorting chamber 3.
Spills out onto the flight along. Meanwhile, the flow trajectory A
The above mixed particles are irradiated from the light sources 9, and the reflected light beam is received by the reflected light receiving element 10A, and the transmitted light beam is received by the transmitted light receiving element 10B. The light reception signal of the reflected light light receiving element 10A is transmitted to the current voltage converter 20 of the reflected light brightness determination section 18.
The signal is converted into a voltage by the amplifier 21, and the signal is amplified by the amplifier 21 and input to the comparator 23. In the comparator 23, the input signal is compared with the setting signal of the first reference setting value V ₁ set in the setting device 22, and for the input signal (colored particles to be removed) having the reference setting value V ₁ or more, In response to the following input signal (brown rice that is not removed), a signal of L is generated and input to the AND circuit 31. On the other hand,
The light reception signal of the transmitted light light receiving element 10B is converted into a voltage by the current/voltage converter 24 of the transmitted light brightness determination section 19, and the signal is converted to a voltage by the amplifier 25.
The amplified signal is branched and one side is sent to comparator 27, and the other side is sent to comparator 2.
9 respectively. The signal input to the comparator 27 is the second reference setting value from the setting device 26.
Compared with the set signal of V ₂ , the reference setting value is H for input signals below V ₂ (colored grains to be removed), and H for input signals above (colored grains and brown rice with a bluish tinge that are not removed). and emit an L signal respectively.
The signal input to the AND circuit 30 and the comparator 29 is compared with the setting signal of the third reference setting value V 3 from the setting device 28, and the input signal below the reference setting value V ₃ (not removed) is compared with the setting signal of the third reference setting value V ₃ from the setting device 28 The AND circuit 30 outputs an L signal for dead green rice, immature rice, and an H signal for the above input signals (colored grains to be removed).
Enter. The AND circuit 30 logically ANDs the input signals from each of the comparators 27 and 29 and inputs the output signal to the AND circuit 31 . The AND circuit 3
1, a signal obtained by ANDing the input H signal from the transmitted light brightness determination unit 19 and the H signal from the reflected light brightness determination unit 18 is input to the drive circuit 32, and the signal is Since the opening/closing solenoid valve 33 is activated and the jet is emitted from the injection nozzle device 12, colored grains are removed from the particles mixed with different colored grains on the flow trajectory A, excluding the sized grains (raw green rice, etc.) that are tinged with blue. In addition to reliable wind screening and separation, the removed colored grains are discharged outside the machine from the different color grain discharge port 15, and brown rice, dead green rice, immature grains, and grains with a bluish tinge that are not blown are removed. The grains are taken out of the machine via the grain collecting cylinder 14.

Note that the light source 9 may include a white or daylight fluorescent lamp or a green fluorescent lamp as appropriate, and the brightness/darkness determining section is not limited to the configuration shown in the drawings, and may of course be modified as appropriate. .

Effects of the Invention The present invention distinguishes colored grains excluding regular grains with a bluish tinge etc. in parallel using reflected light and transmitted light. The injection nozzle device is activated only when the particles are distinguished from colored particles excluding regular particles with a bluish tinge, compared to the conventional case of discrimination based on one discrimination criterion. The discrimination accuracy has been improved, and even if one side is determined to be colored grains, excluding regular grains with a bluish tinge, the injection nozzle device will not operate unless the other is identified, and both will be colored grains with a bluish tinge. The injection nozzle device operates only when it is determined that the particles are colored particles, excluding the particles.This makes it possible to appropriately reduce the number of injections of the injection nozzle device and prevent the above-mentioned failures.The simple structure also ensures high accuracy. It is possible to completely eliminate the drawbacks of the conventional equipment that performs color sorting to remove only the colored grains that have a bluish tinge, etc., and re-sort them as described above, and also to greatly improve the sorting efficiency. have an effect.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the color sorter, Figure 2 is the layout of the photoelectric sorting chamber, Figure 3 is a diagram of the distribution of various particles depending on the amount of light reflected from brown rice, and Figure 4 is a diagram of the distribution of various particles depending on the amount of light transmitted through brown rice. The particle distribution state diagram, FIG. 5, is a block diagram of the brightness determination section. DESCRIPTION OF SYMBOLS 1... Heat retention machine cylinder, 2... Downflow gutter, 3... Photoelectric sorting room, 4... Grain feeding device, 5... Box frame, 6... Supply hopper, 7... Vibration device, 8... Vibrating grain feeding gutter, 9... Light source,
10, 10A, 10B...light receiving element, 11...reference color plate, 12...photoelectric detection device, 13...injection nozzle device, 14...grain collection barrel, 15...different color grain outlet, 16...
Control circuit, 17...Machine frame, 17A...Strut, 18...Brightness/darkness determination section for reflected light, 19...Brightness/darkness determination section for transmitted light,
20... Current voltage converter, 21... Amplifier, 22... Setting device, 23... Comparator, 24... Current voltage converter, 2
5... Amplifier, 26... Setting device, 27... Inverting comparator,
28...Setter, 29...Comparator, 30...AND circuit,
31...AND circuit, 32...drive circuit, 33...
Solenoid valve for opening/closing, A...Flow trajectory, _V1 , _V2 , _V3 ...Reference setting value.

Claims (1)

[Claims] 1. Particles mixed with different color particles are allowed to flow down from a downflow gutter, and a photoelectric detection device consisting of a light source, a light receiving element, and a reference color plate is provided around the flow trajectory, and is activated by a signal from the detection device. In an apparatus for color sorting by providing a spray nozzle device, the particles mixed with different color particles are irradiated from a light source, and the reflected light and the transmitted light are respectively received by a light receiving element, and the amount of light received by the light receiving element for reflected light is blueish, etc. A light/dark judgment section for reflected light that outputs when the amount of light is equal to or higher than a first reference setting value, which discriminates colored grains excluding regular grains with a tinge of blue, and a light receiving element for transmitted light that detects regular grains with a bluish tinge, etc. A light/dark judgment section for transmitted light is provided which outputs an output when the value is equal to or less than a second reference setting value for discriminating the removed colored particles, and when both judgment sections output, the injection nozzle device is operated to perform color sorting. The featured photoelectric detection device of the color sorter. 2. The transmitted light brightness/dark determination section outputs an output when the amount of received light is less than the second reference setting value and more than a third reference setting value for determining dead green rice and immature grains. A photoelectric detection device for a color sorter according to item 1.