JPS63319092A - Sensitivity regulator for cereal color selector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a grain color sorter for sorting and removing abnormally colored particles (defective products) from granular materials such as grains, and particularly This invention relates to a sensitivity adjustment device for a grain color sorter.

[Conventional technology]

Conventionally, this type of color sorting machine has been developed, for example, in Japanese Patent Application Laid-Open No. 47-26
As disclosed in No. 166 (see FIG. 7), a large number of long tapered slides (raw material supply troughs) 101 are provided in an inclined manner, and a chute 102 connected to a vibrating device is installed at the top of the slide 101, and a chute 102 connected to a vibration device is also installed at the bottom end of the slide 101. The part includes an optical detection means consisting of a photoelectronic detection device 103, a light source 104, a background 105, etc., and a compressed air valve 10 interlocked with this detection means.
6 and a nozzle 107 are disposed, and the unique particles (
Brown rice, milky white grains, etc.) and foreign matter are caught by the detection means, and the compressed air valve 106 is operated to blow the foreign particles into a rejection hopper (for defective products) 108 and remove them. When no signal pulse is emitted from the particle, the particle passes through the product pipe 109 and is taken out of the machine as a good product.

By the way, in grain color sorting machines in rice milling factories, etc., it is inefficient to flow raw materials one grain at a time into the raw material feed gutter, so it is normal to let them flow down in bundles (for example, 100 grains per 4 grains supplied). ~200kg/Hr), but in this case, when compressed air is ejected from the nozzle in response to the unusual color particle detection signal from the detection means, it is inevitable that good products will be blown away mixed with defective products (the amount of good products mixed in depends on the raw material supply gutter). (increases as the flow rate increases).

Therefore, the group of defective products (containing non-defective products) taken out from the rejection hopper 107 is re-sorted in a re-sorting channel, and the good products obtained in this re-sorting channel are returned to the raw material side, thereby separating the good products and defective products. We are trying to sort out as completely as possible (see Japanese Patent Publication No. 60-2114).

[Problem that the invention seeks to solve]

However, on the other hand, it is necessary to adjust the sensitivity (level) of the detection means, especially the photoelectronic detection device 103, and set the appropriate sensitivity to properly remove defective products such as unusually colored grains.
Must be. In other words, if the sensitivity is too low, defective products will mix in with the good products, while if the sensitivity is set too high, the compressed air valve 106 will operate frequently and even the good products will tend to be blown away. In addition, the sensitivity must be adjusted while visually checking the oscilloscope, which is troublesome and makes the selection accuracy unstable.

(Means for solving the problem) In order to solve this problem, the present invention provides an optical detection unit consisting of a light source, a background sensor, and a light receiving sensor provided near the lower end of the downflow gutter that slides the raw material grains at high speed. , in a grain color sorting machine equipped with an ejector device for separating non-color grains from non-defective grains that have passed through an optical detection section, and an ejector operating circuit comprising an amplifier, a comparator, etc. and provided between the light receiving sensor and the ejector device. , B. A sample measuring unit for detecting different colored grains in the raw material, different colored grains separated by the ejector device, and each different colored grain in the non-defective group, and a signal processing processor electrically connected to this sample measuring unit. establish.

Comparison of the ejector operating circuits is performed to ensure that the mixing rate of different colored particles in the non-defective group and the different colored particle group is within a preset reference range when flowing at an appropriate flow rate of the downflow gutter, which is determined by the mixing rate of different colored particles in the raw material. A technical measure was taken to electrically connect the sensitivity adjustment volume of the instrument to the signal processing device.

[For production]

Samples of raw materials, good quality grains and unusual grains were sampled.
In the sample measuring section, each different color particle in the raw material, non-defective product group, and different color particle group is measured, and each contamination rate is calculated by a signal processing processor. The appropriate flow rate in each downflow gutter can be determined from the mixing rate of different colored particles in the raw material, and the mixing rate of each different colored particle in the good product group and different colored particle group when flowing at this appropriate flow rate is determined from the preset standard at the time of the relevant flow. The signal processor changes the sensitivity adjustment volume of the comparator in the ejector operating circuit so that it is within the range.

[Embodiments of the invention]

A preferred embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a partially omitted front view of an embodiment of the present invention, Fig. 2 is a right sectional view of the same, Fig. 3 is a left sectional view of the main part of Fig. 1, Fig. 4 is a control block diagram, and Fig. 5 is a FIG. 3 is a schematic operational circuit diagram of the ejector device.

A raw material tank 2 is provided in the upper part of the cover 1, and a vibrating feeder 3 is provided adjacent to the lower end of the raw material tank 2. A vibration generator 4 is connected to the vibration feeder 3, and the tip of the vibration feeder 3 is formed in a wave shape.
As a result, bundles of rice grains (in this embodiment, the grains are described as rice grains) are supplied to each of the many downflow troughs 5 connected to the photographic feeder 3.

The downstream wU5... has its upper end connected to the vibrating feeder 3 and is installed at an appropriate inclination. A pair of optical detection units 6 are provided at the lower end of each downflow gutter 5 so as to face each other, and ejector devices 7 are respectively provided below on substantially the same slope as the downflow gutter 5. Each ejector device 7 includes an air pipe 8 connected to an air compressor (not shown), an ejector valve 9, a nozzle 10 connected to the ejector valve 9, and the like.

Above the ejector device 7... is surrounded by a partition wall 11 having an opening for rice grains to pass through, and below the nozzle 10, good product discharge troughs 12 are provided on approximately the same slope line as the flow down stream 8!5. Further, a defective product discharge gutter 13 is formed below the partition wall 11 and its lower end is connected to a screw conveyor 14 for defective products, while the lower end of each non-defective product discharge gutter 12 is connected to a screw conveyor 15 for non-defective products.

Next, the optical detection section 6 will be explained. A pair of optical detection units 6 are connected to the casing 16 to prevent the entry of lumps, etc.
The surfaces facing each other are transparent walls, and a wiper (not shown) may be attached to the transparent wall.

A fluorescent tube 17 is installed horizontally in each casing 16, and a lens barrel 18 consisting of a rice bran lens, a filter, and a slit;
A light receiving sensor 19 provided integrally with the lens barrel 18 and a background 20 facing each lens barrel 18 are provided.

The background 20 in this embodiment is rotatable around a rotation axis so as to have the same brightness as a non-defective product, but it may also be formed by a light bulb whose brightness is variable. The light receiving sensor 19 is electrically connected to the ejector valve 9. That is, as shown in Figure 5,
The light receiving sensor 19 is connected to a comparator 53 via an amplifier (head amplifier 51 and main amplifier 52).
further connected to monostable multi 54, OR gate 55
and is connected to the ejector valve 9 via a transistor 56 as a valve gate. The main amplifier 52 is provided with a gain adjustment volume vR1, the comparator 53 is provided with a sensitivity adjustment volume 57 (VR2), and the monostable multi 54 is provided with a volume VR3 for adjusting the length of one shot. P is a power source for the ejector valve 9.

The above is a general description of the so-called sorting section A that removes different color particles and foreign matter from raw rice. Below, the sensitivity adjustment device that controls the sorting state of this sorting section will be explained.

A sample measuring section B is provided on one side of the cover 1 to check (inspect) the rate of defective products in the sorting section.

That is, a raw material flow down gutter 21, a good product flow down gutter 22, and a defective product flow down gutter 23 are installed in the same sloping shape as the flow down gutter 5... in the sorting section A described above, and the raw material flow down gutter 21 is connected to the upper end of the raw material flow down gutter 21. Sample photographic feeder 38 in which the gutter 24, the good product supply gutter 25 connected to the upper end of the good product flow lower gutter 22, and the defective product supply 'uA 26 connected to the upper end of the defective product flow lower gutter 23 are the same.
A sample vibrating feeder 38 is formed within the sample vibrating feeder 38 and is connected to a vibration generator (not shown). Furthermore, in order to convey the sample to each of these supply troughs, a connecting bridge 27 extending from the raw material tank 2 is connected to the raw material supply trough 24, and a screw conveyor 1 for non-defective products is connected to the non-defective product supply trough 25.
5 is connected to the discharge part of a packet elevator for non-defective products 29 which is connected by a good product intake gutter 28, and a screw conveyor for defective products 14 and a defective product intake 13 are connected to the defective product supply gutter 26.
Packet elevator for defective products connected by 0-31
Connect the discharge part of the A raw material shutter 32 and a raw material shutter solenoid 33 for opening and closing the raw material shutter 32 are installed at the connection between the raw material tank 2 and the communication gutter 27, and a raw material shutter solenoid 33 that opens and closes the raw material shutter 32 is installed, and the screw competition t7-15 for good products and the good product intake gutter 28 are connected to each other. A non-defective shutter 34 and a solenoid 35 for the non-defective shutter that opens and closes the non-defective shutter 34 are installed at the connection part, and a defective shutter 36 and a non-defective shutter solenoid 35 for opening and closing the non-defective product shutter 34 are installed at the connection part between the defective product screw conveyor 14 and the defective product mixing rate 30. A defective shutter solenoid 37 that opens and closes the shutter 36 is installed.

As shown in FIG. 4, the feeder coil drive circuit 40 of each vibratory feeder 3 in the sorting section and the feeder coil drive circuit 41 of the sample vibratory feeder 38 in the sample measurement section B are connected to a signal processing processor 42, and the raw material The shutter solenoid drive circuit 43, the good shutter solenoid drive circuit 44, and the defective shutter solenoid drive circuit 45 are also connected to the signal processing processor 42, respectively.

Next, the optical detection section 6a in the sample measurement section will be explained with reference to FIG. Raw material flow down gutter 21, quality product flow down gutter 2
A pair of optical detection units 6a (a raw material optical detection unit 6a1, a good product optical detection unit 6a2, and a defective product optical detection unit 6a3) are located below the respective inclination directions of the flow rate value 2 and the defective product flow value 23, and slide down each flow gutter. They are placed opposite each other with rice grains in between.

Similar to the optical detection section 6 in the sorting section A, each optical detection section 6a + to 6a3 is equipped with a fluorescent tube 46 and a background 47, and a defective product detection sensor 48 is mounted opposite each background 47. Roughly speaking, one sensor 49 for the total number of grains is provided in each of the optical detection sections 681 to 5a3. That is, a total particle number sensor 49 is provided in one of the optical detection sections 6a facing each other, and a light source, such as a light emitting diode 50, directed toward the total particle number sensor 49 is provided in the other optical detection section 6a. A total particle number sensor 49 and a light emitting diode 5 are provided.
A through hole 51 (a hole that does not affect the flow of rice grains, or a hole in which a transparent material is inserted) is located near the lower end of each of the flow down troughs 21 to 23 on a line connecting 0 to It is formed so that the light from the diode 50 passes through the through hole 51 and enters the total particle number sensor 49. Each defective product detection sensor 48 is connected to a counter 62 and an arithmetic circuit 63 of the signal processing processor 42 via an amplifier 60 and a comparator 61, and each total grain number sensor 49 also receives a signal via an amplifier 64. It is connected to the counter 62, arithmetic circuit 63, etc. of the processing processor 42.

The signal processor 42 is connected to the sensitivity adjustment volume 57 (VR2) of the ejector device operating circuit (FIG. 5) via an interface 65, thereby controlling the detection at each optical detection section 6a+ to 5a3 of the sample measurement section. If the mixing rate of defective products in the non-defective product group and the percentage of defective products in the defective product group calculated by counting and calculating by the signal processing processor 42 based on the results are not within the range of the allowable mixing rate set in advance, , set the sensitivity adjustment volume 57 to, for example, O.
. The display panel 74 for the percentage of defective products in non-defective products, the display panel 75 for the percentage of defective products in defective products, and the display panel 76 for the percentage of defective products in raw materials are connected to the signal processing processor 42 via a display circuit 69. In addition, a control box 70 having a built-in signal processing processor 42, etc.
It is provided integrally with the front operation panel 71.

Below the raw material flow down gutter 21, the good product flow down gutter 22, and the defective product flow down gutter 23 in the sample measuring section B, there are provided a raw material flow back 166, a good product flow tJ67, and a defective product flow back 68 for receiving the sample after measurement. The raw material recirculation gutter 66 is connected to the raw material tank 72 via a packet elevator 69, the good product recirculation gutter 67 is connected to the screw conveyor 15 for good products, and the defective product recirculation gutter 68 is connected to the screw conveyor 14 for defective products.

Note that a keyboard 72 and a printer 73 may be connected to the signal processing processor 42, and when color sorting machines are connected, the signal processing processor 4 of each color sorting machine may be connected to the signal processing processor 42.
2 may be connected to a central processing unit (CPU) provided in a central control room, and the sensitivity of each color sorting machine may be adjusted via this central processing unit. Furthermore, it goes without saying that the sensitivity adjustment device of the present invention can be employed in a color sorting machine equipped with a reselecting section as shown in Japanese Patent Publication No. 60-2114.

Next, specific operations in the above embodiment will be explained. Refined rice grains are put into the raw material tank 2 from the chute pipe of a packet elevator (not shown), the vibrating sample feeder 38 is activated, and the raw material shutter renoid 33 is excited for several seconds to open the raw material shutter 32. The rice grains in the raw material tank 2 are supplied in fixed amounts at a rate of 11 tons via the connecting bridge 27! ! The raw material flows down the raw material flow down gutter 21 from the tip of the raw material 24, passes through the raw material optical detection section 5aT, passes through the raw material return gutter 66 and the packet elevator 69, and is returned to the raw material tank 2 again.

At this time, in the optical detection section 5a+, the total grain number sensor 49 detects all the particles passing through the optical detection section 5a1, and the defective product detection sensor 48 detects abnormally colored grains (brown rice, white rice, etc.). ) and foreign objects (stones, bran balls, etc.) are detected.

That is, the total grain number sensor 49 receives the amount of light from the light emitting diode 50 that enters through the through hole 39, but each time rice grains flow down the raw material flow down trough 21, the through hole 39
Since the amount of light incident from the light emitting diode 50 decreases, the change in the amount of light is converted into an electric voltage) and amplified and input to the signal processing processor 42.
A counter 62 counts.

On the other hand, the defective product detection sensor 48 receives the amount of light from the background 47, which has been adjusted in advance to have the same brightness as the rice grains, so when a grain of rice (good product) passes there is almost no change in the amount of received light; When grains (defective products) pass through, the amount of light reflected and transmitted by the different colored grains is different from the background 47, so this light m difference is amplified as a voltage difference and compared with the reference voltage set in the comparator 61. A signal larger than this reference voltage is input to the signal processing Brohisser 42 and counted (when the voltage is smaller than the reference voltage, no signal is output from the comparator).
In this way, when the total number of grains and the number of different-colored grains are counted by the counter 62, and the mixing rate of different-colored grains, for example, 2%, is calculated by the calculation circuit 63, the flow rate of each downflow gutter in the sorting section is determined. In other words, an example of a preferable relationship between the defective product contamination rate and the flow rate, which was determined experimentally, is as shown in Fig. 6. When the defective product contamination rate χ is 0.1% or less, the flow rate is 200 ko/Hr. , in the case of 2% in this example, it is approximately 77 kg/@r. The relationship between this defective product mixing rate and the flow rate is determined by the signal processing processor 42.
When the contamination rate χ is calculated, the signal processing processor 42 adjusts the frequency of the imaging generator 4 to match the determined flow rate. (The relationship with the flow rate is set in advance). Note that the raw material may be checked at regular intervals and the flow rate may be constantly adjusted.

In this way, bundles of rice grains with a flow rate suitable for sorting are transferred to each downstream trough 5.
When it slides down and passes between the pair of optical detection parts 6,
The products are sorted into defective products and non-defective products, and the non-defective products are sent to the non-defective product discharge gutter 1.
2 and is discharged into the screw conveyor 15 for non-defective products.
The group of defective products is discharged into a screw conveyor 14 for defective products along a defective product discharge gutter 13. In other words, the light receiving sensor 19 receives the amount of light from the background 20, which has been adjusted in advance to have the same brightness as a non-defective product, and when a non-defective product passes through this background, there is almost no difference in the amount of light received, but when a defective product When the defective product passes, the reflected light and transmitted light from the defective product differ from the light amount of the background 20, so that the amount of light received by the light receiving sensor 19 changes. This change in the amount of light received is converted into a change in voltage, and the head amplifier 5
1 and the main amplifier 52 to a voltage that can be easily processed by the comparator 53 (this amplified voltage waveform is observed by an oscilloscope provided on the operation panel 71). The amplified voltage signal is output to a certain level in the comparator 52, that is, a voltage value that becomes a threshold, for example, 5V.
When a waveform that exceeds this threshold appears, the monostable multi 54 is activated and becomes a one-shot signal.
The one-shot signal is input to a transistor 56 via an OR gate 55 to operate the ejector valve 9. High-pressure air is injected from the nozzle 10 by the operation of the ejector valve 9, and the non-color particles and the non-defective particles around them are blown away.

A group of good products and a group of defective products transported outside the machine by the screw conveyor 15 for non-defective products and the screw conveyor 14 for defective products are sampled at arbitrarily set times, for example, every 3 minutes, and the sample measurement section B detects the contamination of the defective products. Rates are checked. The sample measuring section B will be described in detail below.

The non-defective shutter 34 provided at the connection between the non-defective screw conveyor 15 and the non-defective take-in machine 28 is energized by a non-defective shutter solenoid 35 electrically connected to the signal processor 42 every 3 minutes, for example, for 10 seconds. It is opened for 10 seconds every 3 minutes in conjunction with the operation, and the non-defective products in the screw conveyor 15 for non-defective products are flowed down from the non-defective product take-in machine 28 to the packet elevator for non-defective products 29, and fried by this packet elevator-29. It is transported to the good product supply gutter 25. The good product supply gutter 25 is a vibration feeder 38 for samples.
As a result, the good samples discharged into the good product supply gutter 25 fall one by one from the four ends of the good product supply gutter 25 into the good product flow lower gutter 22 and slide down the bottom of the good product flow lower gutter 22. In the non-defective optical detection section 5a 2 disposed opposite to the lower end of the non-defective flow down trough 22, the optical detection section 6 for the raw material described above is
a Similar to I, the total particle number sensor 49 detects all the particles flowing down the good product flow down gutter 22, and the defective product detection sensor 48 detects abnormally colored particles, which are each input to the signal processing processor 42. are counted and calculated. The non-defective products that have passed through the optical detection section 6a2 are returned to the non-defective product screw conveyor 15 through the non-defective product return gutter 67.

Defective product screw conveyor 14 and defective product supply gutter 30
The defective product shutter solenoid 37 that opens and closes the defective product shutter 36 provided at the connection with the defective product shutter is energized every 3 minutes in synchronization with the good product shutter solenoid 35, but generally both of the defective product groups Since the amount is small, we will excite it for 30 seconds. In conjunction with this, defective shutter 36
is opened for 30 seconds every 3 minutes to divert the group of defective products (odd-color grains mixed with good products) in the screw conveyor 14 for defective products into the defective product intake 130, and to move the packet elevator 31 for defective products. Then, the defective products are conveyed to the defective product supply gutter 26. Similar to the case of non-defective products, the defective products in the defective product supply gutter 26 flow down the defective product flow down gutter 23 to the optical detection unit 5a 3 for defective products.
Then, the total particle number sensor 49 detects the total particles, the defective product detection sensor 48 detects the defective products, and the respective signals are input to the signal processing processor 42 for counting and calculation. Defective products that have been measured are recycled [
68 and is returned to the screw conveyor 14 for defective products.

In this way, the optical detection parts 6a2 to 6a of good products and defective products
The electrical signals input from 3 to the signal processing processor 42 are counted and arithmetic processed, and are digitally displayed on the display panel 74 for the proportion of defective products in non-defective products and the display panel 75 for the proportion of defective products in defective products on the operation panel 71. However,
At the same time, the sensitivity of the sorting section A is adjusted based on this measurement result. That is, when a defective product is detected by the optical detection unit 6 and the ejector valve 9 is operated and compressed air is injected from the nozzle 10, the number of particles blown away (non-conforming particles) is determined, for example, when the flow rate per gutter 5 is 200 kg. /
Approximately 8 tablets for Hr, approximately 6 for 150kL/Hr
grains, 100ko/Hr: Approximately 4 grains, 50kg/
If the number of grains is approximately 2 for Hr, the rate of defective products in the standard group of defective products is 1 for flow m 200kO/Hr.
2.5%, flow fit 150k (16.7% for J/Hr, flow E: 25 for J 100kg/Hr)
．． 0%, flow m 50k (50.0% for 1/Hr)
Therefore, a width of about ±10% is provided to these reference values and set in advance in the storage device of the signal processing processor 42. Note that since the number of particles blown off by the nozzle 10 also varies depending on the operating time of the ejector valve 9, this reference value is set based on experimental values when the color sorter is operated. In the case of this embodiment, the flow rate is 77 kQ/Hr, so it is 44±10%. On the other hand, the ratio of defective products in good products is ideally 0%, but it is appropriately set depending on the purpose of the sorted items, the desired product value, etc., and is set to 0.02% in the signal processing processor 42, for example.

Compare the thus determined percentage of defective products in the group of defective products and the percentage of defective products in the non-defective product group, which are the standards, at a certain appropriate flow rate with the 8 values actually measured in sample measurement section B every 3 minutes. For example, ■ The rate of defective products in the group of defective products is within the standard value ±10%, and the rate of defective products in the group of non-defective products is 0.
．． If it is less than 0.02%, the sensitivity is not adjusted.

■ If the percentage of defective products in the non-defective product group is within 0.02% and the percentage of defective products in the defective product group is greater than the reference value +10%, the sensitivity adjustment volume 57 is adjusted by a command from the signal processor 42. Raise the threshold by 0.5V (1 step) to lower the sensitivity.

■ If the percentage of defective products in the group of good products exceeds 0.02% and the percentage of defective products in the group of defective products is within the standard value ±10% or greater than the standard value +10%, the sensitivity adjustment volume 57 Lower the threshold by 0.5V (1 step) to increase the sensitivity.

■ The percentage of defective products in the group of good products is 0.02% or less, and the percentage of defective products in the group of defective products is - (minus) of the standard value.
If it is lower than 10%, lower the sensitivity in the same way as in ■.

■ The percentage of defective products in the group of good products exceeds 0.02%, and the percentage of defective products in the group of defective products is the set value - (minus) 10
%, the feeder coil drive circuit 40
The frequency of the vibrating feeder 3 is lowered via the oscillating feeder 3, and the flow rate is decreased by one step, for example, 10k (1/Hr).

According to a preset pattern, the sensitivity is adjusted one step at a time so that the state of ■ is always maintained.

In addition, in this example, a supply gutter, a flow gutter, and an optical detection section were provided exclusively for raw materials, non-defective products, and defective products. It may be formed to flow.

[Effects of the Invention] As described above, according to the present invention, a sample measuring section for detecting different colored grains in the raw material, different colored grain groups separated by the ejector device, and each different colored grain in the non-defective group, and this sample are provided. A signal processing processor electrically connected to the measurement unit was provided, and the mixed-color grain mixing rate in the non-defective product group and the different-colored grain group at the time of flowing down the flow gutter at an appropriate flow rate determined by the mixed-color grain mixing rate in the raw material was set in advance. The sensitivity adjustment volume of the comparator of the ejector operating circuit is electrically connected to the signal processing device so that the flow rate is within the standard range. At the same time, the signal processor is used to adjust the sensitivity of the comparator in the ejector operating circuit so that the mixed color particles in the non-defective group and the defective group are within the allowable range of the standard different color particle mix rate. By varying the volume, the optimal sensitivity during flow at the appropriate flow rate can be obtained instantly and accurately, the sorting accuracy is stable, and unmanned operation is possible.

[Brief explanation of drawings]

FIG. 1 is a partially omitted front view of an embodiment of the present invention, FIG. 2 is a right side view of the same, FIG. 3 is a left sectional view of the main part of FIG. 1, FIG. 4 is a control block diagram, and FIG. An operating circuit diagram of the ejector device, FIG. 6 is a glass showing the relationship between the rate of defective products in raw materials and the appropriate flow rate, and FIG. 7 is a side view of a conventional example. DESCRIPTION OF SYMBOLS 1... Cover, 2... Raw material tank, 3... Vibration feeder, 4... Vibration generator, 5... Downflow gutter, 6
... Optical detection unit, 7... Ejector device, 8...
・Air pipe, 9... Ejector valve, 10...
Nozzle, 11... Partition wall, 12... Good product discharge gutter, 13
... Defective product discharge gutter, 14... Screw conveyor for defective products, 15... Screw conveyor for non-defective products, 1
6... Casing, 17... Fluorescent tube, 18... Lens tube, 19... Light receiving sensor, 20... Background, 21... Raw material flow down gutter, 22... Good product flow down gutter , 23... Defective product flow down gutter, 24... Raw material supply gutter,
25... Good product supply gutter, 26... Defective product supply gutter, 27
... Communication gutter, 28... Good product intake gutter, 29... Packet elevator for non-defective products -130... Defective product supply gutter, 3
1... Packet elevator for defective products - 132... Raw material shutter, 33... Solenoid for raw material shutter, 34... Good product shutter, 35... Solenoid for non-defective product shutter, 36... Defective product shutter, 37・
... Lenoid for defective shutter, 38 ... Vibration feeder for sample, 39 ... Through hole, 40 ... Feeder coil drive circuit, 41 ... Feeder coil drive circuit, 42 ... Signal processing module Oj7 Tsusar, 43... Solenoid drive circuit for raw material shutter, 44... Solenoid drive circuit for non-defective shutter, 45... Lenoid drive circuit for defective shutter, 46... Fluorescent tube, 47
... Background, 48 ... Defective product detection sensor, 49 ... Total particle number sensor, 50 ... Light emitting diode, 51 ... Head amplifier, 52 ... Main amplifier, 53 ... Comparator, 54...monostable multi, 5
5...OR gate, 56...transistor, 57
...Sensitivity adjustment volume, 60...Amplifier, 61.
...Comparator, 62...Counter, 63...Arithmetic circuit, 64...Amplifier, 65...Interface,
66... Raw material reflux gutter, 67... Good product reflux gutter, 68.
...Defective product supply gutter, 69...Packet elevator-1
70... Control box, 71... Operation panel, 72... Keyboard, 73... Printer, 7
4...Display panel for percentage of defective products in good products, 75...
Display panel for percentage of defective products in defective products, 76... Panel for displaying percentage of defective products in raw materials.

Claims (2)

[Claims] (1) An optical detection unit consisting of a light source, a background sensor and a light receiving sensor installed near the lower end of a downflow gutter that allows raw grain to slide at high speed, and an ejector device that separates non-defective particles from unusual particles passing through the optical detection unit. , and an ejector operating circuit including an amplifier, a comparator, etc., and provided between the light receiving sensor and the ejector device. A sample measuring section for detecting each different colored grain in a group of non-defective products and a signal processing processor electrically connected to this sample measuring section are provided, and the appropriate flow rate of the downflow gutter determined based on the mixing rate of different colored grains in the raw material is provided. The sensitivity adjustment volume of the comparator of the ejector operating circuit is electrically connected to a signal processing compressor so that the mixed rate of different colored grains in the non-defective grain group and the different colored grain group is within a preset reference range. Sensitivity adjustment device for grain color sorter. (2) Sensitivity of the grain color sorter according to claim (1), wherein the ejector device is an ejector valve having one end connected to an air compressor via an air pipe and the other end connected to a nozzle. Adjustment device.