JPH0352681A - Grain screening device - Google Patents

Abstract

PURPOSE:To improve screening efficiency by irradiating grains with a white light source and detecting the blue grains in accordance with a difference between the wavelength output of the min. light quantity of a reflected light quantity and the output of the wavelength smaller by the prescribed wavelength than the above-mentioned output. CONSTITUTION:The grains are let off by each one piece from a storage tank 1 and the white light source from a lamp 4 is reflected by a reflecting plate 5 by each one grain during the downflow on a downflow tray 3. The incident light entering from a slit 12 part is passed through respective band-pass filters 8, 9 from a filter 6, a lens 7 and a half mirror 21 and is detected as the outputs of the wavelengths (a), (b) by photomultipliers 10, 11. The detected output currents are subjected to a voltage conversion and the difference between the outputs is calculated. An air gun 28 operates to blow the blue unhulled grain into a blue grain tank 19 when the blue unhulled grain is detected. The germinating rate of the unhulled seed grain is improved in this way.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a grain sorting device.

Conventional technology Conventionally, a white light source is irradiated onto each grain as it flows down, and a bandpass filter is used to detect the amount of light reflected from each grain at a predetermined wavelength. This is a grain sorting device that detects green grains based on the output of the grain and removes the green grains.

Problem to be Solved by the Invention A white light source is irradiated onto the paddy grains flowing down one grain at a time, and the amount of reflected light reflected from each grain is measured through a bandpass filter, for example, at a wavelength of 660 to 680. The output is detected, and green rice grains are detected and removed by this detected output, but at a single wavelength of 660 to 680, it is difficult to detect fine grains, especially when the grains are small, due to the size of grains between varieties. Therefore, when seed rice is sorted, a large amount of immature and green rice grains may be mixed in. This may result in poor germination rate.

Means for Solving the Problems This invention irradiates a white light source onto grains that are flowing down one by one, and determines the wavelength (i.e., ) and the output at a wavelength (a) that is a predetermined wavelength smaller than this wavelength (i), and calculate the output difference between these two wavelengths (a) and (a). This is a grain sorting device characterized in that it detects green grains based on the following.

Effect of the Invention A white light source is irradiated onto the paddy grains flowing down one grain at a time, and the amount of reflected light reflected from each grain is measured through a band pass filter, for example, at wavelength (a) of 660 to 680 im Outputs at two wavelengths between 610 and 630 mm are detected, an output difference is calculated from these detected outputs, and this calculated output difference is calculated to be positive. Then, if the output difference is calculated to be negative, it is detected to be a green rice grain, and this green rice grain is removed.

Effects of the invention With this invention, the amount of reflected light for each grain can be adjusted to two different wavelengths.
The output at a specific wavelength is detected and the output difference is calculated, and whether the calculated output difference is positive or negative determines whether it is a refined grain or a green grain. This makes it possible to accurately detect green rice grains, and when seed rice is sorted, immature rice grains and green rice grains can be reliably sorted and removed, and therefore the germination rate of this seed rice can be reduced. has improved.

Embodiment In the illustrated example, a storage tank (1) for storing paddy grains to be sorted is provided in the upper part, and a delivery valve (2) is provided in the lower part of this storage tank (1) to feed out the paddy grains one by one and flow down.
The structure includes a downstream shelf (3) that guides the paddy grains that are fed out one by one, and a plurality of white light sources that irradiate the paddy grains flowing down one by one at the bottom of the downstream shelf (3). The configuration includes four lamps (4).

A reflector plate (5) is provided to reflect the white light source emitted from the lamp (4) one by one, and the light reflected from the reflector plate (5) enters through the slit (12). A filter (6), a lens (7) and a half mirror (21) are provided to receive the light, and the reflected light reflected from the half mirror (2l) is passed through each bandpass filter (8), (9).
), and this bandpass filter (8) receives the reflected light when the wavelength (a) is 660 to 680ss, and the bandpass filter (9) receives the reflected light when the wavelength (a) is a predetermined wavelength smaller than the wavelength (a). This bandpass filter (8) is configured to receive the reflected light when the (mouth) is 610 to 630 years old.
is detected by the photomultiplier (10) as an output at a wavelength of 670 ssi, and is detected by the bandpass filter (10).
9), the configuration is such that the output at wavelength 620H is detected by a photomultiplier (1l). The photomultiplier (
The output current detected by 10) and (I1) is converted by an A-D converter (13) that performs A-D conversion, and the converted value converted by this A-D converter (13) is sent to the input circuit (14). ) and performs arithmetic and logical operations, comparison operations, etc. on various input values input from this input circuit (14).
5) The configuration includes an output circuit (16) that receives and outputs various commands from the CPU (15).

The photomultiplier (10) input to the CPU (15)
The difference between the detected value (VB) of the photomultiplier (1l) and the detected value (VA) of the photomultiplier (1l) is determined by this CPU (15) as (VB).
B) −(VA), and for example, if this detection difference is calculated to be negative, it will be detected as a green rice grain, and contrary to the above, if this detection difference is calculated to be positive, it will be detected. It is configured to detect that it is a refined rice grain, and when it is detected that it is a green rice grain, the operation of the solenoid (17) is controlled by the CPU (15) via the output circuit (16), and the solenoid (17) is activated. The operation activates the air gun (18), and the air gun (18) sends the green rice grains to the green grain tank (19).
) and stored in this blue grain tank (19), and if it is detected as refined rice grains, the solenoid (17) is not operated and the sorted refined grains are It falls into the refined rice tank (20), and this refined rice tank (2
0).

Hereinafter, the operation of the above embodiment will be explained.

The paddy grains to be sorted stored in the storage tank (1) are fed out one by one from the storage tank (1) by the rotation of the feed valve (2), and while flowing down the flow shelf (3), the rice grains are drawn out from the storage tank (1) by the ramp (4).
The white light source emitted from the is reflected by the reflector plate (5) one by one, and the light enters from the slit (12) part, and this human light is filtered through the filter (6), lens (7) and half mirror (
21) through each bandpass filter (8), (9), 670 fingers of wavelength (a) and 620 fingers of wavelength (mouth)
．． The photomultiplier (10), (
11), this detected output current is converted into voltage to calculate the output difference, and when the calculated output difference is negative, it is detected as a green paddy grain, and when it is detected as a green paddy grain, the solenoid (17) is activated, the air gun (18) is activated, and the air gun (18) blows the green rice grains into the green grain tank (19), stores them in this green grain tank (19), and calculates the calculated output. When the difference is positive, it is detected as refined rice grains, and the refined rice grains fall and are stored in the refined rice tank (20).

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway side view, FIG. 2 is a block diagram, and FIG. 3 is a diagram showing the relationship between wavelength and amount of reflected light. In the figure, code (4) is a lamp, (5) is a reflector, and (6)
is a filter, (7) is a lens, (8) and (9) are band pass filters, and (10) and (11) are photomultipliers.

Claims (1)

[Claims] A white light source is irradiated onto the grains flowing down one grain at a time, and the output of the wavelength (a) when the amount of reflected light reflected from each grain is the lowest for blue grains, and from this wavelength (a). It is characterized by detecting the output at two locations, the output at a wavelength (b) that is less than a predetermined wavelength, calculating the output difference between these two wavelengths (a) and (b), and detecting blue grains based on this output difference. Grain sorting equipment.