JPS605358B2 - Automatic control device for color sorting machine - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to an automatic control device for a grain color sorting machine.

Prior Art and Problems This type of conventional color sorter allows particles of different colors to flow down from a downflow gutter, and has a reference plate, an injection nozzle device, and a light source equipped with a light amount adjustment device that can manually adjust the amount of light near the flow trajectory. A photoelectric sorting chamber is provided, and a light receiving element detects the difference between the amount of light obtained by irradiating particles flowing down along the trajectory from a light source and the amount of light from the reference plate, and transmits the signal to a control circuit. There is a known method in which particles of different colors are sorted out by operating a spray nozzle device (for example, Japanese Patent Laid-Open No. 51-27568).

However, when sorting, it is necessary to manually adjust and set the light amount adjusting device so that the amount of light received by the light receiving element matches the amount of light from the conditioned particles and the amount of light from the reference plate. Therefore, when the reference plate becomes dirty due to dust, etc., and the amount of light passing through the reference plate changes or the grains to be sorted change, the light intensity adjustment device of the reference plate is often manually adjusted to adjust the amount of light reflected from the regular particles. There was the trouble of having to manage the amount of light so that it matched the amount of light. Means and Function for Solving the Problems The present invention uses a limiter (amplitude limiter) to limit the signal generated from the difference between the amount of light from the reference plate and the amount of light from the particles from the light receiving element.
By passing through the filter, the upper limit of the abnormal signal due to different color particles is cut to a certain value, this cut signal is smoothed and amplified by a smoothing amplifier circuit, and the light amount of the reference plate is adjusted according to the output of this smoothing amplifier circuit. It is designed to be adjusted.

As a result, if there is a difference between the amount of light from the reference plate and the amount of light from the regular particles, an average signal that equalizes this difference is output from the integral smoothing amplifier circuit, and the amount of light from the reference plate is adjusted. The amount of light from the plate and the amount of light from the regular particles are automatically matched and maintained. Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, the reference numeral 1 in the figure is a sorting machine frame, and a vibrating grain feeder 3 with a vibrating device 2 is installed on the upper part of the machine frame 1, and a supply hopper 4 is provided on the supply side of the machine frame 1. A downflow gutter 5 is connected to the side to form a grain feeding process, and the lower end of the flowdown gutter 5 is equipped with a reference plate 6 equipped with a light amount adjustment device 14 consisting of a light emitting diode 15, etc., an injection nozzle device, and a light source. The photoelectric separation chamber 7 is connected, and a photoelectric equipment layer consisting of the light amount adjustment device 14 of the reference plate 6, the light source 8, and the light receiving element 9 is connected to the flow path A of the particles mixed with different colors flowing out from the flow gutter 5. The light receiving element 9
and an injection nozzle device are electrically connected via a control circuit 11, and an outlet 1 for dissimilar particles is provided at the bottom of the light crab sorting chamber 7.
2 is provided, and a grain collection cylinder 13 for particle conditioning is inserted on the extension line of the trajectory A to take out the particle distribution outside the machine. The photoelectric sorting chamber 7 will be explained with reference to FIG.
A plurality of light sources 8 such as fluorescent lamps are mounted on both side walls of the sorting chamber 7 at appropriate intervals, and light receiving elements 9 are mounted on the front and rear walls of the flow path A as the center, respectively. A reference plate 6 is provided at a position facing each light receiving element 9, 9.
6 are removably attached to each of the reference plates 6, and a light amount adjusting device 14 consisting of a plurality of light emitting diodes 15, etc. is mounted on the back side of each reference plate 6, 6. Next, the electric circuit of the light amount adjusting device 14 will be explained with reference to FIG.

A branch terminal 16 provided on the light receiving element 9 side of the control circuit 11
is connected to the input side of an inverting amplifier 18 equipped with a limiter diode 17, and its output side is connected to a plurality of light emitting diodes 1 via an integral smoothing amplifier circuit 19 and a resistor 20.
It is connected to a light amount adjustment device 14 consisting of 5, . . . , etc. With the above-mentioned configuration, particles of different colors of the raw material flowing down from the supply hopper 4 to the vibrating grain feeder 3 flow down to the lower flow gutter 5 due to the vibration action of the vibrating grain feeder 3, and are subjected to photoelectric separation. The liquid flows out in the chamber 7 along a predetermined flow trajectory A in a flying manner. In the sorting chamber 7, the light intensity of the particles obtained by irradiation from the light source 8 and the light intensity from the reference plate 6 are detected by the light receiving element 9. A difference occurs between the amount of light from the reference plate 6 and the amount of light from the reference plate 6, and the light receiving element 9 detects this difference, and the control circuit 11
The injection nozzle 10 is actuated by the detection signal to emit air at the appropriate time. The jet action causes the different color particles to leave the flowing trajectory A, and the separated particles are transferred to the outlet 12.
At the same time, the sorted particles flowing out along the trajectory A flow directly into the grain collecting cylinder 13, are taken out of the machine, and are entrusted to the next process. The above operation is the same as that of a conventional color sorter, but in the embodiment according to the present invention, the signal detected by the light receiving element 9 is inputted to an inverting amplifier 18 through a branch terminal 16 as shown in FIG. ing. Therefore, the signal detected by the light receiving element 9 is transferred to the inverting amplifier 1.
The signal detected by the light receiving element 9 becomes a pulsating signal due to the difference between the amount of light from the reference plate 6 and the amount of light from the flowing particles, and the amplified signal is output from the inverting amplifier 18. It will be done. In particular, when different-colored particles flow down, the difference between the amount of light from the different-colored particles and the amount of light from the reference plate 6 increases, resulting in a pulse with a large amplitude. Since the head portion of the pulse is cut off by the limiter diode 17, the signal input to the integral smoothing amplifier circuit 19 becomes a signal in which the abnormal signal caused by the different color particles is corrected. In other words, the output signal from the integral smoothing amplifier circuit 19 is the amount of light received from the reference plate 6 and the regular particles, and the amount of light from the different color particles is also due to the limiter diode. Therefore, if the output of the integral smoothing amplifier circuit 19 based on the amount of light from the reference plate 6 alone is taken as the reference level, the amount of light from the reference plate 6 and the amount of light from the regular particles are If the difference is large, the signal from the light-receiving element will pulsate greatly, and its average value will also move greatly from the reference level, and the averaged output from the integral smoothing amplifier circuit 19 will be output from the light amount adjusting device 4. By greatly increasing or decreasing the current flowing through the light emitting diode 15, the amount of light from the reference plate 6 (reference level) is brought closer to the amount of light from the regular particles. If the difference from the light intensity is small, the pulsation is small, and the difference between the averaged signal level output from the integral smoothing amplifier circuit 19 and the reference level is small, and the output of the integral smoothing amplifier circuit 19 is transmitted to the light emitting diode 15. Since the light is output from the reference plate 6, the amount of light from the reference plate changes only slightly.As a result, the amount of light from the reference plate 6 is automatically adjusted to match the amount of light from the regular particles.
If they match, the signal from the light-receiving element due to the uniform particles will hardly pulsate, and the output signal from the integral smoothing amplification circuit 19 will be maintained at a constant reference level. Effects of the Invention As described above, the present invention limits the signal due to different color particles among the signals due to the amount of light from the flowing particles with a limiter, and extracts the signal due to the amount of light from regular particles. The light intensity of the reference plate is automatically adjusted so that the signal level from the particles matches the signal level from the reference plate, so even if the particles flowing down change,
In addition, even if the reference plate becomes dirty and the light intensity changes, the light intensity of the reference plate can be automatically changed so that the light receiving element receives the same amount of light from the grain particles and from the reference plate, so the adjustment work can be omitted. Moreover, the sorting performance can be greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of the photoelectric separation chamber, and FIG. 3 is an electrical circuit diagram of the same. 1... Sorter frame, 2... Vibration device, 3
... Vibrating grain feeder, 4... Supply hopper, 5... Downflow gutter, 6... Reference plate, 7.
...Photoelectric sorting room, 8...Light source, 9...
- Light receiving element, 10... Injection nozzle, 11...
...Control circuit, 12... Discharge port for different color particles, 13...
...Grain collection tube for particle conditioning, 14...Light amount adjustment device,
15... Light emitting diode, 16... Branch terminal, 17... Limiter diode, 18
...Inverting amplifier, 19... Integral smoothing amplifier circuit, 20... Resistor, A... Falling locus. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Different color mixed particles are allowed to flow down from a downflow gutter, and a reference plate equipped with a light amount adjustment device, an injection nozzle device, and a light source are provided near the flow trajectory, and the particles flowing down along the trajectory are A color system that uses a light-receiving element to detect the amount of light emitted from a light source and the amount of light from a reference plate, distinguishes different-colored particles based on the detection signal, and operates a spray nozzle device to sort out the different-colored particles. In the sorting machine, a smoothing amplification circuit is provided to input the detection signal through a limiter, and the output of the smoothing amplification circuit is input to the light amount adjustment device to automatically control the light amount of the reference plate. Automatic control device for color sorting machine. 2. The automatic control device for a color sorter according to claim 1, wherein the detection signal is amplified by an amplifier and input to the smoothing circuit via a limiter. 3. The automatic control device for a color sorting machine according to claim 1 or 2, wherein the smoothing amplification circuit is an integral smoothing amplification circuit. 4. The automatic control device for a color sorting machine according to claim 1, 2 or 3, wherein the light amount adjusting device is a light emitting diode.