JPS61110016A - Photoelectric detector for color selector - Google Patents

Abstract

PURPOSE:To achieve a simplified construction and a higher detection accuracy, by providing a dichroic mirror of a construction peculiar to the optical path in a photoelectric detector. CONSTITUTION:Particles mixed with those of different colors as material dropping to a vibrating grain feed gutter 8 from a feed hopper 6 run down with a vibrator 7 through a down gutter 2 in a photoelectric selection chamber 3. In the selection chamber 3, a beam emitted from a light source 9 provided on a photoelectric selector 12 irradiate grain particles running down along a downflow locus A separately and the transmission light is made incident into a dichroic mirror 19 through a condenser 20. This mirror 19 reflects short wavelength components from the surface thereof 19 below about 550nm as boundary while transmits long wavelength components through the surface thereof 19 thereabove. The reflected light as the short wavelength component is received with a light receiving element 10A while the transmission light as long wavelength component done with a light receiving element 10B and the light reception signals thereof are inputted into a control circuit 16 to be compared with respective preset references. An jet nozzle unit 13 is operated by the light reception signal exceeding the set reference to separate particles of different colors.

Description

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

Conventional technology and its problems Conventionally, the photoelectric detection device of a color sorter for grains, etc., irradiates a subject with white light having a wide range of wavelengths, and passes the reflected or transmitted light through a single color filter. Since the light rays of specific wavelengths were received according to In addition to complicating the interior of the photoelectric chamber and making inspection and repair inconvenient, each light receiving element has drawbacks such as the angle of incidence of the received light rays changing and the amount of light received is attenuated. However, the amount of light received by each light-receiving element is halved, resulting in a significant decrease in detection accuracy.Therefore, improvements to these devices have long been desired.

Purpose of the Invention In view of the above-mentioned points, the present invention divides the light rays from the subject into short wavelength components and long wavelength components and reflects each wavelength component by providing a diloic mirror with a unique structure in the optical path in the photoelectric detection device. By transmitting and receiving light efficiently, the drawbacks of the conventional device described above are completely eliminated, and multiple specific wavelengths can be detected with high precision, greatly improving the ability to sort by color. Moreover, it is an object of the present invention to provide a high-performance photoelectric detection device for color sorting roses that has a simple structure and can reliably indicate high-quality carefully selected grains without contamination with different-color grains.

Structure of the Invention The photoelectric detection device of the color sorter of the present invention allows particles mixed with different colors to flow down from a downflow gutter, and around the trajectory of the flow, a photoelectric detection device consisting of a light source, a light receiving element, and a reference color plate, and the detection device In the device for color sorting by providing an injection nozzle device activated by a signal, a dichroic mirror that divides the received light beam into a short wavelength component and a long wavelength component and reflects and transmits each wavelength component is installed in the photoelectric detection device. The light source irradiates the different color mixed particles on the falling trajectory from the light source, and the reflected or transmitted light is received by a plurality of light receiving elements via the dike mirror and is selected.

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

In FIG. 1, reference numeral 1 denotes a heat-retaining machine part into which a downstream gutter 2 is inserted, a photoelectric sorting chamber 3 is installed in the lower half of the R cylinder 1, and a machine part 1
A grain feeding device 4 is connected to the upper end of the grain feeding device 4 to integrally form a sorting machine. A vibrating grain feeding trough 8 equipped with a device 7 is installed, and a light source 9. Light receiving element 10. A photoelectric detection device 12 consisting of a reference color plate 11 is provided, and an injection nozzle device 13 is arranged in relation to the inside of the machine section 1 below the photoelectric detection device 12, and a grain collecting barrel 14 is fixed on an extension line of the flow trajectory A. At the same time, a unique grain discharge port 15 is opened at the lower end of the machine section 1, and a Nada frame 17 with a built-in control circuit 16 is fixed to the side of the machine section 1.
A support 18 is provided at the bottom of the machine frame 17 to integrally form a color sorting machine.

In the photoelectric detection device 12 (see FIG. 2), a dichroic mirror 19 is arranged behind the condenser lens 20 to divide the received light into short wavelength components and long wavelength components and reflect or transmit them. , the particles mixed with different color particles on the falling trajectory A are irradiated from each of the light sources 9 . 21 is a blue filter, 22 is formed as follows.
is a red filter.

The operation of the above configuration will be explained below.

The mixed particles of raw material (for example, brown rice) flowing down from the supply hopper 6 to the vibrating grain feed gutter 8 flow down to the lower flow gutter 2 by the vibration action of the vibrating device 7, and the mixed particles are washed away from the gutter surface. and flows down inside the photoelectric sorting chamber 3 along a flow trajectory A. In the photoelectric sorting chamber 3 (see Fig. 2), the light beams emitted from the light sources 9 provided in the photoelectric sorting device 12 follow a falling trajectory A.
The transmitted light beams (or reflected light beams) are incident on the dichroic mirror 19 via the condenser lens 2o. This dichroic mirror 19 has a wavelength characteristic of dividing the received light into a short wavelength component and a long wavelength component and reflecting and transmitting each wavelength component.
As shown in Figure 3, with the wavelength 55Qnm as the boundary line, shorter wavelength components are reflected from the mirror 19 surface, longer wavelength components are transmitted through the mirror 19 surface, and the reflected light of the shorter wavelength components is passes through the blue filter 21, and the (fourth
(See figure) Due to its wavelength selectivity, the wavelength is 400 to 500 nm.
The light II (relative intensity 100%) of the area is sent to the light receiving element 10A, and the transmitted light of the long wavelength component passes through the red filter 22, and due to its wavelength selectivity, the wavelength is 600 to 700 nm.
The light rays (relative intensity 100%) in the area are each received without attenuation by the light receiving element 10B, and each received light signal is input to the control circuit 16 and compared with each predetermined reference value, and the said setting reference value is The jet nozzle devices 13 are actuated by the received light signal exceeding the value, and the jet action of the jet nozzles scatters, separates and sorts out the different colored particles from the mixed particles (brown rice). In conventional devices, a single light-receiving element receives transmitted light (or reflected light) and selects it, so that the particles with a bluish tinge exceed the set standard value. As shown above, multiple light-receiving elements are installed to detect two types of specific wavelengths with a length of 4.
00 to 500nII1 area, 600 to 700rv area), the light reception signal of the light receiving element 10A is input to the control circuit 16, and the signal erases the detection signal of the light receiving element 10B, and the injection nozzle device 1
3 can be prevented, the colored grains are scattered and separated while leaving bluish regular grains in the mixed grains, and the separated different colored grains are discharged outside the machine from the different colored grain outlet 15. At the same time, the reference color particles are taken out of the machine via the grain collecting cylinder 14.

In addition, the dichroic mirror can arbitrarily change and adjust the wavelength of the boundary line explained in FIG. 3 by changing the size of the molecules of the vapor-deposited coating material, and also transmits short wavelength components and reflects long wavelength components. It can also be formed like this. In addition, multiple dichroic mirrors may be used in parallel, and the sorting method using dichroic mirrors, in addition to the exemplified brown rice sorting, may also use each specific wavelength to separate two types of uniquely colored particles. This sorting method is suitable for color sorting grains such as rice and wheat, beans, and the like.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, by providing a dichroic mirror with a unique structure in the optical path within the photoelectric detection device, the light rays from the object are divided into short wavelength components and long wavelength components. By reflecting and transmitting each wavelength component to efficiently receive light, it is possible to completely eliminate the drawbacks of the conventional device described above, and it also has the ability to detect multiple specific wavelengths with high precision and sort by color. In addition, the structure is extremely simple, making production and assembly easy, and it has the effect of reliably producing selected grains of high quality that are free from foreign-colored grains.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of the color sorter, Figure 2 is the layout inside the photoelectric detection device, Figure 3 is a graph showing the wavelength characteristics of the dichroic mirror, and Figure 3 is the wavelength characteristics of the light after passing through the filter. This is a graph showing. 1... Bridge section for heat retention 2... Downflow gutter 3... Photoelectric sorting 4... Grain feeding device 5... Box frame
6... Supply hopper 7... Vibration device
8... Vibrating grain feeder 9... Light source 10. IOA
, 10B... Light receiving element 11... Reference color plate 1
2...Photoelectric sorting device 13...Copying nozzle device 14
...Blank collector tube 15...Unusual grain discharge port 16...Control circuit 17...Machine frame 18...Strut 19
...Dichroic Mira 20...Collection lens 2
1...Blue filter 22...Red filter A
...Downflow path Patent applicant: Satake Seisakusho Co., Ltd. Figure 1 2 Second flow downpipe 3: Photoelectric sorting room Figure 3 Width length (nm) Figure 4 1! j! (nm) Procedure name (original format) % formula % 1. Indication of the case Patent Application No. 231800 of 1982 2. Title of the invention Photoelectric detection device for color sorting machine 3. Person making the amendment Relationship with the case Patent Applicant Address: 1-19-10 Ueno, Taito-ku, Tokyo Name (1)
81) Manufactured by Satake Co., Ltd. February 6, 1985 (shipped February 26, 1985) 5. Subject of correction 4. Brief explanation of drawings Figure 1 is a side sectional view of the color sorting machine. FIG. 2 is a layout diagram inside the photoelectric detection device, FIG. 3 is a graph showing the wavelength characteristics of a dichroic mirror, and FIG. 4 is a graph showing the wavelength characteristics of light after passing through a filter. 1... Heat retention bridge section 2... Downflow gutter 3... Photoelectric sorting room 4... Grain feeding device 5... Box frame
6... Supply hopper 7... Vibration device
8... Vibrating grain feeder 9... Light source 10.10A
, 10B... Light receiving element 11... Reference color plate 1
2...Photoelectric sorting device 13...Copying nozzle device 14
...Branch collector tube 15...Unusual grain discharge port 16...Control circuit 17...Machine frame 18...Strut '1
9... Dichroic mirror 20... Rice bran collecting lens 21... Blue filter 22... Red filter A... Downward trajectory

Claims (1)

[Claims] Particles mixed with different colors 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, and an injection nozzle device activated by the signal of the detection device are installed around the trajectory of the flow to perform color sorting. In the device, a dichroic mirror that divides the received light into short wavelength components and long wavelength components and reflects and transmits the respective wavelength components is provided in the photoelectric detection device, and the particles mixed with different color particles on the falling trajectory are A photoelectric detection device for a color sorter, characterized in that light rays emitted from a light source and reflected or transmitted are received by a plurality of light receiving elements via the dichroic mirror and are sorted.