JPH0389980A - Apparatus for sorting hue of particulate matter - Google Patents

Abstract

PURPOSE:To obtain the title apparatus capable of certainly preventing the erroneous operation of a photodetector in spite of a simple structure by mounting the wiping material sliding on a light emitting part and a light detecting part to a reference color panel. CONSTITUTION:A hue detector B is constituted by providing a light omitting part 18 and a light detecting part 19 to an inclined substrate 26 so as to make the upper surfaces thereof flush with each other and providing a reference color panel 21 equipped with a wiping material 20 on both of them so as to advance and recede. The reference color panel 21 is held by an arm 43 and reciprocally moves to the left and right by the rotation of the output rotary shaft 45 of a motor 44. The reference color panel 21 advances and recedes on the substrate at the early period of work and the hue thereof is detected as a sorting standard by a detection element and, since the wiping material 20 sliding on the light emitting part 18 and the light detection part 19 is mounted to the reference color panel 21, the dust on the surfaces of both parts 18, 19 is wipen off in the front stage of the work by the wiping material 20 and, since hue sorting work is performed after transparency is secured, no erroneous operation is brought about and particulate matter can be accurately sorted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color sorting device for grains such as coffee beans, which detects the color of grains using a light-receiving element and separates them into good and defective products.

[Conventional technology]

Conventionally, a backklund system has been used as this type of sorting device.

In the bank ground method, a background and a light-receiving element are provided opposite to the downstream position of the particulate matter from the hopper, and light is irradiated from a light source to the particulate matter, the background 1~, and the light-receiving element, The light-receiving element detects the amount of light reflected or transmitted from the particulate matter, the computer compares the detected value with the standard light amount value, and informs the injection nozzle device of the amount of light that deviates from the standard value. Defective particulate matter is removed by air injection and sorted.

[Problem to be solved by the invention]

According to the above-mentioned conventional sorting device, the air pressure ejected from the injection nozzle causes the dust attached to the particulate matter to separate, and it adheres to the main parts of the sorting mechanism such as the light source, pack ground, and light receiving element, and is then sorted. This reduced accuracy and caused malfunctions that even rejected good products.

Therefore, the main parts of the sorting mechanism were sometimes covered with a transparent wall for dust prevention, and the particulate matter was configured to pass through the wall, but with this, the transparent wall would lose its transparency due to the dust. This not only makes it impossible to ensure reliability in light receiving accuracy, but also causes the internal temperature to rise due to the sealing with the transparent wall coating, causing the light source to lose precision due to heating of the light source, leading to its malfunction. However, there is also the problem that the structure is complicated due to the covering structure of the transparent wall.

Regarding the adhesion of dust to transparent walls, it has been proposed to provide a wiping material that slides in contact with the outer surface of the transparent wall, but this would make the structure even more complicated, and the wiping material would not be able to handle the light-receiving element. Since it is detected as a different color and this also causes malfunction, it is necessary to stop the supply of granular material when moving the wiping material, which also poses a problem in terms of work efficiency.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a color sorting device for particulate matter that can reliably prevent malfunction of the light receiving element despite having a very simple structure. It is.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a color detection device having a light emitting part and a light receiving part between a particulate material supply device and a sorting device, and receives reflected light from the particulate material. In a color sorting device for particulate matter, which detects it with an element and separates it into good products with a normal color and defective products with an abnormal color by a sorting device, in addition to installing a board under the trajectory of the particulate matter, the color detection device At the beginning of the process, a reference color plate is installed that advances and retreats from the substrate, and the color is detected as a sorting standard by the detection element.Furthermore, the substrate is equipped with a light-emitting part and a light-receiving part, on which particulate matter can fly, so that their top surfaces are flush with each other. The gist is that a wiping material that slides over the light emitting part and the light receiving part is attached to the reference color plate.

[For production]

Since the color sorting device for granular materials was configured as shown in Section 2,
When the device is operated after putting particulate matter into the hopper, first, in the color detection device, the reference color plate moves forward and backward from the substrate, and the reference color is detected by the light receiving element using the reflected light from the light emitting part. The amount of light is detected and stored in the reflected light detection sensor circuit.

Next, when the granules in the hopper flow down and are supplied to the color detection device one by one, the granules jump over the substrate, and at that time, the amount of light reflected from the light emitting part is detected by the light receiving element. The reflected light detection sensor circuit makes a judgment based on the already stored reference color, and based on the judgment, a sorting device is activated to separate good products and defective products.

However, as the reference color plate advances and retreats, the dust attached to the light-emitting and light-receiving parts during the previous work is wiped off by the wiping material attached to it, which causes malfunctions in the light-receiving elements. There is no need to stop the supply of granular material midway to wipe off dust.

The reference color plate is retracted from the light emitting part and light receiving part during sorting, and is preprocessed internally to align the data before sorting, so the presence of the reference color plate is detected by the light receiving element. It will not be detected as a malfunction. In the case of coffee beans, for example, if the standard color is black, a value 3.5 to 4.5 times or more of the standard color will be determined as a sorted electric current.
If it is white, a value of 0.25 times or less will be determined as a sorted product.

Appropriate materials for the wiping material include rubber and sponge, for example.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

The drawing shows an example in which the granules are coffee beans, and the color sorting device for the granules includes a feeding device A for the granules a, a color detecting device B, and a sorting device C2 in a box body 1. It consists of a dust device, etc.

The feeding device A is provided with a hopper 10 at one end of the rear side of the box l, a vibrating feed chute 12 is provided below the hopper 10 with a forward slope, a shutter 11 is provided on the tip of the hopper 10, and a shutter 11 is provided on the tip of the vibrating feed chute 12. An inclined chute 15 as a springboard is connected to the tip.

The vibrating supply shoes 1 to 12 are formed in V-grooves so as to be able to supply granular material one by one, and also have vibration generating shoes rotated by a motor 37 so as to vibrate up and down about a shaft 36 at the rear end. A roller 38 that is directly received by the vibration generating cam 16 at its front end is supported by a shaft so as to be easily received by the vibration generating cam 16 .

The shutter 11 opens and closes the front end of the vibrating supply chute 12 so that particulate matter can be supplied instantaneously, and is operated by a solenoid 17.

The color detection device B has a light-emitting part 18 and a light-receiving part 19 installed on an inclined base plate 26 made of a metal plate that is more inclined than the inclined chute 15 so that the upper surface thereof is the same, and a reference color with a wiping material 20 attached thereon. The plate 21 is configured to move forward and backward, and the shutter 11 opens after moving forward and backward.

The light emitting unit 19 is located near the exit of the inclined chute J5.
The light emitting ports 23.23 of eight optical fibers 22 are arranged horizontally at equal intervals, and the light emitting ports 23 are connected to the substrate 26.
exposed on the top surface. Also, there is an optical fiber 2 in the lower part.
An LED is provided as the second light emitting body 24.

Further, a non-reflection plate 39 made of a black sponge-like material is provided in the direction toward which the light emitting port 23 faces.

Light is sent from the light emitter 24 to eight optical fibers 22, 22 in a blinking manner in order, so that partial data on the entire surface of the coffee beans can be obtained. As a result, partial defects in coffee beans can be determined, and mutual variations can be corrected.

In other words, as the coffee bean a gradually moves, the way the light hits it changes, but it is detected as a successive level, and
Since the light hits the center and sides of the beans differently, the standard color plate 21 is used to standardize the level including these areas.

In the light receiving unit] 9, a phototransistor light receiving element 27 and a transparent plate 28 covering the upper surface thereof are fitted into a hole 25 made in a substrate 26, and the transparent plate 28 is flush with the substrate 26. . Further, a reflected light detection sensor circuit 40 is provided below the light receiving element 27.

Further, a particulate matter arrival detection sensor 42 is provided above the light emitting section 18, and a phototransistor is used for this sensor. This detects whether or not light has passed, and the computer turns on each optical fiber 22 one by one.
, OFF is confirmed, and if the light is blocked, measurement of reflected light by the light receiving element 27 begins.

In this case, the processing is not done in real time, and it takes time for the coffee beans a to arrive and process them, so if the coffee beans a arrive during the process, the detection accuracy will drop. A detection sensor 42 is provided.

That is, measurement and discrimination can be performed by continuous scanning in real-time processing without providing the detection sensor 42. In real-time processing, the scan period can be shortened by executing a correction program that calculates the magnification with respect to the reference level during A/D conversion, so even without a detection sensor, detection errors and peak values can be obtained. There are no problems such as not being able to do so.

As shown in FIG. 2, the reference color plate 21 is held by an arm 43 and reciprocated left and right by the rotation of an output rotating shaft 45 of a motor 44. Then, the wiping material 20 is fixed to the tip of this reference color plate 21.

The sorting device C has a partition wall 48 erected at the center of the width of the lower end of the bottom plate 30 following the substrate 26 of the one-color detection bag wB, and a damper 4
A motor 50 for shaking a damper 49 left and right is provided above the bottom punch 30. Also, under the bottom plate 30 is a receiving box 51 for good products and defective products. ．． 52 is provided.

The dust evacuation device has a discharging chute 54 with a suction port 53 opened above the inclined chute 15, and a suction discharging box 55 at the rear lower end of the box body 1. A dust collection filter 57 is installed inside the box 55, and a fan 58 is installed at the outlet 1.

This dust removal device removes dust before color detection, thereby preventing the color detection device B from becoming contaminated with dust.

To further describe the characteristics of the color sorting device of the above embodiment, when coffee beans flow down between the coffee bean detection sensor and the light receiving section 18 of the eye bar, and the light is interrupted, the beans The detection sensor circuit 4o operates and sends a detection signal to the computer. In response to this, the reflected light measurement program operates and turns on each LED 24 a certain number of times continuously.
Measure the reflected light.

The measured data is calculated as how many times the reference color level value corresponds to each LED 24 (this reference color level value is obtained by projecting light onto the reference color plate in each LED before sorting). ). This allows the data between the LEDs 24 to be compared, and the maximum value is determined from this.

Furthermore, a histogram of the correction data of the maximum value of each LED at that time is obtained, and depending on the distribution, for example, there are two levels from O to 30, five from 30 to 50, zero from 50 to 80,
When 80 to 100 is 1, set it so that 2 is obtained by table search using 2, 5, 0° 1 as an argument. This 2 means that the determination is made based on the second maximum value.

(Noise is canceled by data pattern.

(1) It is possible to cancel the detection value of the white skin of beans) Next, it is compared with the level input by the sorting level adjustment knob, and if the level is whiter than that, the damper is actuated to change the flow and the defective products are sent to the receiving box 52. drop it to

〔Effect of the invention〕

As explained above, according to the present invention, regarding the color detection device, in addition to providing a substrate under the trajectory of the particulate matter, the color detection device advances and retreats on the substrate at the beginning of the work, and the color is detected as a sorting standard by the detection element. A reference color plate is provided, and a light emitting part and a light receiving part on which particulate matter jumps are formed on the substrate so that their upper surfaces are flush with each other. Since a wiping material was attached to the light-emitting part and the light-receiving part, the dust on the surface of the light-emitting part and the light-receiving part was wiped off with the wiping material before work, and color sorting work was performed after ensuring transparency, which could lead to malfunctions. It is possible to accurately separate particulates into good and defective products, and there is no need to cover the light-receiving area with a dust-proof transparent wall, compared to the case where such a transparent wall is provided. The structure can be simplified, and malfunctions of the light receiving element due to heat generation are eliminated.

In addition, a wiping material is attached to the reference color plate that moves forward and backward on the board.
Since the light-emitting part and the light-receiving part are cleaned by the operation of the reference color plate, there is no need to provide a separate means for the operation of the wiping material, which is also an advantage in that the structure can be simplified. effective.

[Brief explanation of drawings]

The drawings show one embodiment, and FIG. 1 is an overall vertical sectional view, and FIG.
The figure is a plan view of the color detection device, Figure 3 is a sectional view taken along line X-X in Figure 2, and Figure 4 is Y-Y when the reference color plate advances.
5 is a sectional view taken along the line, and FIG. 5 is a plan view of the sorting device. A... Granular material supply device B... Color sorting device C.
Sorting device Particulate matter 18 Light emitting section 19... Light receiving section 20... Wiping material 21... Reference color plate 26
Substrate 27...Light receiving element 40/Reflected light detection sensor circuit Patent applicant Marumasu Kikai Co., Ltd. Representative Patent Attorney Isamu Tsuneta 52

Claims (1)

[Claims] 1) A color detection device including a light emitting part and a light receiving part is provided between the particulate material supply device and the sorting device, and the reflected light from the particulate material is detected by the light receiving element, and the sorting In a color sorting device for granular materials, which uses a device to separate good products with normal colors and defective products with abnormal colors, the color detection device is not only provided with a substrate under the trajectory of the granular objects, but also has a color detector installed on the substrate at the beginning of the work. A reference color plate is provided whose color is detected by the detection element as a sorting standard by moving forward and backward.Furthermore, a light emitting part and a light receiving part over which particulate matter jumps are formed on the substrate so that their upper surfaces are flush with each other, and the reference color plate A color sorting device for granular materials, characterized in that a wiping material that slides over a light-emitting part and a light-receiving part is attached to the device. 2) The color sorting device for particulate matter according to claim 1, wherein a particulate matter arrival detection sensor is provided above the light emitting part in the color detection device.