JPS59189980A - Movement control of partition plate of vibration sorter - 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 The present invention generally relates to an oscillating sorter, and more particularly to a method for controlling the oscillating motion of a partition plate in an oscillating sorter.

As is well known, a swinging sorter separates grains to be sorted by specific gravity by swinging a sorting plate. Regarding such a device, the present applicant first developed an optical sensor to detect the grain sorting state on the sorting plate. We proposed to automatically control the position of the brown rice partition plate that separates the mixed rice and brown rice discharge ports by noticing this monitoring. In this type of proposal, a plurality of optical sensors are provided in a line at predetermined intervals along the discharge surface of the sorting plate near the discharge surface, and each optical sensor monitors the grain sorting state on the sorting plate. It was configured as follows. Therefore, while it is possible to monitor the entire area of the sorting plate and to optimally control the partition plate, it is also necessary to prepare a considerable number of optical sensors, and it is also necessary to compensate for variations in the characteristics of each of these sensors. There was a problem that the configuration became complicated and difficult.

The present invention was made based on such a viewpoint, and its purpose is to monitor the grain sorting state on the sorting plate using a movement sensor and control the movement of the partition plate based on this monitoring.

The features of the present invention for achieving the above object include a sensor mounting body equipped with an optical sensor for grain discrimination and an optical sensor for detecting a brown rice partition plate, and a sensor mounting body mounted on a plate surface near the discharge surface of the sorting plate. A sensor mounting body moving means for moving the sensor mounting body back and forth along the discharge surface, a position detecting means for detecting the moving position of the sensor mounting body, and a partition plate moving means for moving the brown rice partition plate. The separation boundary position of brown rice and mixed rice on the sorting board is detected by the optical sensor for discrimination and the position detection means, and the sensor attachment body is stopped at this position, and information about the separation boundary position and the direction in which the brown rice partition plate should be moved are detected. A method for controlling the movement of a partition plate of an oscillating sorter includes determining the brown rice partition plate, moving the brown rice partition plate in that direction, and stopping the brown rice partition plate by detecting the brown rice partition plate using an optical sensor for detecting the partition plate of a sensor mounting body. .

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial plan view of a swing sorter according to the present invention, FIG. 2 is a sectional view taken along line AA' in FIG. 1, and FIG. 3 is a sectional view taken along line BB' in FIG. 2.
FIG.

In the figure, 1 is a sorting plate, 2 is a brown rice partition plate that partitions a brown rice outlet 4a and a mixed rice outlet 4b, and 3 is a paddy partition plate that partitions a mixed rice outlet 4b and a paddy outlet 4c. The brown rice partition plate 2 is engaged with a helical shaft 5 that is rotationally driven by a partition moving motor M1, and its position is changed by the rotation of the motor M1. Reference numeral 6 denotes a sensor mounting body moving mechanism, which moves the sensor mounting body 7 onto the plate surface near the discharge surface 1a of the sorting plate 1.
Move back and forth along a. The moving mechanism 6 includes a driving pulley 8 rotationally driven by a sensor moving motor M2, a driven pulley 9 facing the driving pulley 8 with the sorting plate 1 in between.
It has a synchronized belt 10 that engages with a drive pulley 8 and a driven pulley 9 and runs parallel to the discharge surface 1a of the sorting plate 1, and a guide rail 11 that is bridged to the sorted plate 1 in parallel to the synchronized belt 10. The sensor mounting body 7 is associated with the synchro belt 10 and the guide rail 11 by means of a retainer 12 . The holder 12 is fixed to a part of the synchro belt 10 and is provided so as to reciprocate on the guide rail 11 between one end and the other end of the sorting plate 1 as the synchro belt 10 reciprocates.

The sensor attachment body 7 is attached to the holder 12, as shown in FIG. The sensor mounting body 7 has a position detection sensor 1 attached to face the position detection plate 15.
3, an edge detection sensor 14, a grain discrimination sensor 17 mounted opposite to the grain stabilizing plate 16 on which grains are placed on the sorting plate 1, and a partition plate position detection sensor that detects the position of the brown rice partition plate 2. 18. Each sensor (13, 14, 17
, 18) are reflective optical sensors. The position detection sensor 13 and the edge detection sensor 14 detect the current position of the sensor attachment body 7 and whether the sensor attachment body 7 has reached the paddy edge or the brown rice edge. The grain discrimination sensor 17 detects the separation boundary between the mixed rice and the brown rice on the sorting plate by using the difference in the amount of reflected light between the paddy and the brown rice. Partition plate position detection sensor 1
8 detects the position of the brown rice partition plate 2 by detecting the reflector 19a attached to the brown rice partition plate 2 via the holder 19. A position detection plate 15 used for detecting the position of the sensor mounting body 7 is provided from one end of the sorting plate 1 to the other end in parallel to the synchro belt 10 and the guide rail 11, as shown in FIGS. 1 and 2. .

FIG. 4 shows the relationship between the position detection plate and each output of the position detection sensor and the end detection sensor. Position detection plate 15
A slit 15a for position detection, a slit 15b for detecting the edge of paddy, and a slit 15c for detecting the edge of brown rice.
has. The position detection slit 15a is a one-dimensional array of slits arranged at predetermined intervals, and faces the position detection sensor 13. Therefore, the signal selected from the position detection sensor 13 is the fourth
As shown in (a) of the figure, the pulse train exhibits an "H" level without a slit. The paddy edge detection slit 15b is formed so as to be detected at the same time as the position detection slit 15a formed at the outermost edge of the paddy side, and the brown rice edge detection slit 15c is formed so as not to be detected at the same time as the position detection slit 15a formed at the outermost edge of the brown rice side. is formed. The paddy edge detection slit 15b and the brown rice edge detection slit 15c are formed opposite to the edge detection sensor 14, and provide output signals as shown in FIG. 4(c). Therefore, whether the sensor attachment body 7 has reached the paddy edge or the brown rice edge can be determined by the position detection sensor 13 and the edge detection sensor 1.
It is possible to discriminate based on the difference in the combination output with 4. Note that (b) in FIG. 4 shows a position count pulse, which is generated from the rising and falling portions of the position detection sensor output (a) and is given as the output of the position count pulse generation circuit described in FIG. .

Returning to FIG. 3, the reflector 19a is attached to the brown rice partition plate 2 via the holder 19 so as to face the partition plate position detection sensor 18 provided on the sensor attachment body 7.

FIG. 5 is a block diagram of a control device according to the present invention, in which 20 is an arithmetic control section, 21 is a multiplexer, 22 is a reference voltage detection circuit, 23 is a measurement voltage detection circuit, 24 is a D/A converter, 25 is a converter, 26 27 is a counter, 28 is a sensor movement motor control circuit, and 29 is a partition plate movement motor control circuit. Note that the same reference numerals as in FIGS. 1 to 4 indicate the same components.

The multiplexer 21 selects the reference voltage detection circuit 22 or the measured voltage detection circuit 23 according to a selection command given from the calculation control section 20. The reference voltage detection circuit 22 is selectively driven when the sensor attachment body 7 reaches the paddy edge or the brown rice edge, and outputs the output of the grain discrimination sensor 17 that detects only the paddy as the paddy reference voltage, and detects only the brown rice. The output of the grain discrimination sensor 17 is outputted as a brown rice reference voltage. This output is passed through a multiplexer 21 to a comparator 25.
The signal is digitized according to comparison with the output of the D/A converter 24 driven by the arithmetic control section 20, and then taken into the arithmetic control section 20. The calculation control unit 20 calculates and determines the paddy discrimination voltage based on these reference voltages, as will be described later. The measuring voltage detection circuit 23 is kept in the activated state while the sensor is moved for grain sorting;
Amplifies and outputs the analog signal from the grain discrimination sensor.

The output of the measurement voltage detection circuit 23 is given to a comparator 25 via a multiplexer 21. At this time, the other input of the comparator 25 is D from the calculation control section 20.
A paddy discrimination voltage is applied via the /A converter 24.

As a result, the comparator 24 determines that it is paddy when the output analog voltage of the grain discrimination sensor 17 is higher than the paddy discrimination dens pressure and gives "H", and when the output analog voltage is low, it determines that it is rice and gives "H". Give L”. The position count pulse generation circuit 26 receives the output of the position detection sensor 13 and outputs a position count pulse as shown in FIG. 4(b). Counter 27 receives the position count pulse from circuit 26 and counts it. Starting and resetting of the counter 27 is under the control of the arithmetic control section 20, and the count contents are referred to by the arithmetic control section 20. The sensor movement motor control circuit 28 and the partition movement motor control circuit 29 control the sensor movement motor M2 and the partition plate movement motor M1, respectively, under the control of the calculation control section 20.

The calculation control section 20 has the following functions. (2) It is determined from the outputs of the position detection sensor 13 and the edge detection sensor 14 whether the sensor attachment body 7 has reached the paddy edge or the brown rice edge. ■When the sensor mounting body 7 reaches the paddy edge or brown rice edge, the counter 2
Start after resetting 7. ■Sensor mounting body 7
The sensor moving motor control circuit 28 reverses the moving direction of the sensor mounting body 7 when the sensor reaches the paddy end or brown rice end.
control. ■When the sensor attachment body 7 moves in one reciprocating route from the brown rice end to the paddy end to the brown rice end, it drives the reference voltage detection circuit 22 at the brown rice end and the paddy end to capture the brown rice reference voltage and the paddy end reference voltage. , paddy discrimination voltage=(paddy reference voltage−brown rice reference voltage)×α+brown rice reference voltage α: determine the paddy discrimination voltage according to the optimum value determined experimentally. During the movement of the sensor attachment body 7 from the next brown rice end to the paddy end following ■■, the measurement voltage detection circuit 23 is driven and its output is compared with the paddy discrimination voltage, and this comparison result and the counter 27 are Based on the count contents, the position of the separation boundary between mixed rice and brown rice on the sorting board is determined. ■The direction in which the brown rice partition plate 2 should be moved is determined based on the information regarding the current position of the brown rice partition plate 2 and the boundary position between mixed rice and brown rice on the sorting plate, and the partition plate movement motor control circuit 2
A control signal is given to 9.

The operation of the above configuration will be explained below.

At the start of operation, the sensor attachment body 7 is placed at the edge of brown rice. Therefore, the sensor attachment body 7 completes one reciprocating route by passing through the brown rice end → paddy end → brown rice end.

In this example, the monitoring of the grain condition on the sorting plate by the sensor consists of (a) brown rice edge for determining the paddy discrimination voltage →
This is carried out by repeating the steps of measuring the round-trip route from the paddy edge to the brown rice edge and (b) detecting the one-way route from the brown rice edge to the paddy edge to detect the separation boundary on the sorting plate. At the start of operation, a setup phase is first carried out, followed by a detection phase.

When the operation in the setting stage starts, the position detection sensor 13 and the edge detection sensor 14 output brown rice edge detection information (position detection sensor output “H”) as shown in (a) and ) b) of FIG. , end detection sensor output “L”) are given to the calculation control section 20. The arithmetic control unit 20 thereby provides a drive command to the reference voltage detection circuit 22 and also provides support to the sensor movement motor control circuit 23 to move the sensor attachment body 7 toward the paddy side. The reference voltage detection circuit 22 thereby provides the output of the grain discrimination sensor 17 to the comparator 25 via the multiplexer 21 . Since the sensor attachment body 7 is located on the brown rice side, the output of the grain discrimination sensor 17 is only the reflected light output of the brown rice. The arithmetic control section 20 supplies the output of the D/A converter 24 driven by the arithmetic control section 20 to the other input of the comparator 25 in order to convert the output analog quantity of the reference voltage detection circuit 22 into a digital quantity. The output of the reference voltage detection circuit 22 is digitized according to the output of , and this is taken in as the brown rice reference voltage. On the other hand, the sensor moving motor control circuit 28 drives the sensor moving motor M2 to move the sensor mounting body 7 toward the paddy side. As a result, when the sensor attachment body 7 reaches the paddy side, the paddy edge detection information (position detection sensor output “L”, edge detection sensor output “H”) is sent from the position detection sensor 13 and the edge detection sensor 14 to the calculation control unit 20. Given. As a result, the arithmetic control section 20 gives a drive command to the reference voltage detection circuit 22 and also gives an instruction to the sensor movement motor control circuit 28 to move the sensor attachment body 7 toward the brown rice side. The reference voltage detection circuit 22 thereby detects the grain discrimination sensor 17.
The output of
to one of the inputs. Grain discrimination sensor 17 at this time
The output is only the high output reflected from the paddy. The arithmetic control unit 20 takes in the paddy reference voltage in the same manner as the above-mentioned taking in of the brown rice reference voltage, and uses the previously taken in brown rice reference voltage to determine the paddy discrimination voltage according to the above-mentioned calculation formula. When the sensor attachment body 7 returns to the brown rice end again, the step of setting the paddy discrimination voltage is completed. In this setting stage, the arithmetic control unit 20 detects the current position of the brown rice partition plate 2 using the partition plate position detection sensor 18 and stores it.

In the detection stage, the measurement voltage detection circuit 23 is
The process starts when a drive command is given to the sensor moving motor control circuit 28, an instruction to move the sensor attachment body 7 toward the paddy side is given, and a reset signal is given to the counter 27. The measurement voltage detection circuit 23 continuously inputs the analog output of the grain discrimination sensor 17 to one input of the comparator 25 via the multiplexer 21 until the sensor attachment body 7 leaves the brown rice end and reaches the paddy end.

The calculation control unit 20 converts the paddy discrimination voltage obtained in the setting stage into D/
After converting the signal into analog via the A converter 24, it is applied to the other input of the comparator 25. The converter 25 supplies a short-period pulse to the arithmetic control unit 20 with a measurement voltage higher than the paddy discrimination voltage, and does not output a pulse when the measurement voltage is lower than the paddy discrimination voltage.

The arithmetic control unit 20 counts the number of consecutive pulses and determines that there is paddy when a predetermined number of pulses is given.

As for the separation boundary between brown rice and mixed rice, when such information on the presence of paddy is given three times in a row, the third detected position is recognized as the separation boundary. The arithmetic control unit 20 stores the separation boundary position, and when the sensor attachment body 7 further moves toward the paddy side and reaches the end of the paddy, the drive of the measurement voltage detection circuit 23 is released and the separation boundary position is Detection is essentially complete.

The calculation control unit 20 causes the sensor moving motor control circuit 28 to control the sensor moving motor control circuit 28 in accordance with the memory of the separation boundary position during the process in which the moving direction of the sensor mounting body 7 is reversed at the paddy end and returns to the brown rice side.
Give instructions to stop moving. At the same time, it recognizes the relationship between the separation boundary position, that is, the stop position of the sensor attachment body 7 and the current position of the brown rice partition plate 2, and moves the brown rice partition plate to the position corresponding to the stop position of the sensor attachment body 7. 2
Determine the direction of movement. The arithmetic control unit 20 gives a control position according to the determined movement direction to the partition plate movement motor control circuit 29, and the brown rice partition plate position detection sensor 18 detects the reflector 19a and stops the partition plate 2, thereby changing the position. control. As described above, the sensor mounting body 7 reverses its moving direction at the paddy end, stops moving at the separation boundary position, and returns to the brown rice side when the position control of the brown rice partition plate 2 is completed. No separation boundary is detected during this movement. The detection stage ends when the sensor attachment body 7 reaches the brown rice side again, and the setting stage starts again and is repeated thereafter.

As explained above, according to the present invention, after the moving sensor detects the separation boundary on the sorting plate, the moving sensor is stopped at the separation boundary position and the partition plate position is controlled based on this. , there is no need to prepare multiple optical sensors as in the past, there is no need to compensate for variations in characteristics among these optical sensors, there is no need to calculate the amount of movement of the brown rice partition plate, and there is no need to prepare grains in the entire area of the sorter. Since the separation boundary is determined by looking at the grain sorting state, the boundary position can be accurately recognized, and there are advantages such as no need for a device for detecting the amount of movement of the partition plate or for measuring time.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view of the oscillating sorter according to the present invention, FIG. 2 is a sectional view taken along the line AA' in FIG. 1, and FIG. 3 is a sectional view taken along the line BB' in FIG. 2.
A cross-sectional view, FIG. 4 is a diagram showing the relationship between the position detection plate and each output of the position detection sensor and the end detection sensor, and FIG. 5 is a block diagram of the control device according to the present invention. 1. Sorting board 2. Brown rice partition board 6. Sensor movement mechanism 7. Sensor mounting body 13. Position detection sensor 22. Reference voltage detection circuit 14.
Edge detection sensor 23. Measured voltage detection circuit 15. Position detection plate 17. Grain discrimination sensor 18, cutting plate position detection sensor 20, arithmetic control section 28, sensor movement motor control circuit 29, partition plate movement motor control circuit

Claims (1)

[Claims] A sensor mounting body equipped with an optical sensor for grain killing determination and an optical sensor for detecting brown rice partition plate electricity, and a sensor mounting body that moves the sensor mounting body back and forth on the plate surface near the discharge surface of the sorting plate along the screening surface. A body moving means, a position detecting means for detecting the moving position of the sensor attachment body, and a partition stock moving means for moving the brown rice partition plate, and the sensor attachment body has an optical sensor for grain discrimination and a position detection means to detect grains on the sorting plate. detects the separation boundary position between brown rice and mixed rice, stops the sensor attachment at this position, and moves the brown rice partition plate in the direction in which the brown rice partition plate should be moved based on information regarding the separation boundary position and information regarding the current position of the brown rice partition plate. A partition plate of an oscillating sorting machine characterized in that the brown rice partition plate is moved in that direction by determining the brown rice partition plate, and is stopped when the brown rice partition plate is detected by an optical sensor for detecting the partition plate of a sensor mounting body. Movement control method.