JPH0440067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic escape rate control device, and particularly to an automatic escape rate control device that maintains and controls a preset escape rate.

In order to achieve the above purpose, unrolling of paddy 1
The unrolled paddy 11-a, 1-b is supplied to the huller 3 which unrolls the paddy.
Theoretical load current value determined from the supply amount to 1-b for a constant evasion rate and the de-rolling 11-a, 11
In an automatic evasion control device based on a comparison with a load current value of an electric motor 15 that rotates -b,
The automatically controllable region of the theoretical load current value is defined as a small amount supply region below a predetermined position of the supply valve 13 that adjusts the amount of paddy supplied to the derollers 11-a and 11-b, and a large amount supply region above a predetermined position. The main feature of the present invention is that the removed area includes a derolling gap adjustment control device 19 that adjusts the gap between the derolling rolls 11-a and 11-b in order to maintain the constant shedding ratio.

1 and 2 show an embodiment in which the present invention is applied to a swing sorting device 1, in which 3 is a huller, 5 is a grain lifting machine, and 7 is a sorter. In addition, 8
is the oscillating sorting section.

The hulling machine 3 includes a paddy funnel 9, a supply valve 13 provided at the lower part of the paddy funnel 9 for restricting the supply of paddy from the paddy funnel 9 to the derolls 11-a and 11-b, and the supply valve. 13 is detected and a predetermined escape rate (e.g.
90%) and the actually measured load current value of the motor 15 for rotationally driving the derolling 11-a, 11-b, the derolling rate is set in advance. value (e.g. 90
%).
This configuration includes a deroll gap adjustment control device 19 (not shown in FIG. 1) that controls the drive of a gap adjustment motor 17 for changing the gap 1-b.

Note that the opening degree of the supply valve 13 is changed by the grain lifting machine 5.
A supply tank 2 that supplies the fallen rice to the swinging sorting section 8 of the
It is linked to the height relative to 1. Further, the motor 15 is also used to drive the sorting machine 7 to swing.

As shown in the circuit diagram of FIG. 2, the derolling gap adjustment control device 19 detects the opening degree of the supply valve 13 and determines that the predetermined derolling rate is, for example, 90%.
In the shaded area in the experimental graph shown in FIG. 3, which shows the relationship between the opening degree of the supply valve 13 or the amount of paddy supplied to the unrolled paddy 11-a, 11-b, and the theoretical load current value of the motor 15, Displayed y=ax
Based on the automatically controllable region that can be approximated by the equation +b, the reference value setting unit 23 outputs a signal indicating the theoretical load current value as a comparison standard, and the detected opening degree of the supply valve 13 falls within the automatically controllable region. a control region detection unit 24 that detects whether or not the roll-off is in place, a load current detection unit 25 that detects the load current of the motor 15 for rotationally driving the unrolling units 11-a and 11-b, and the load current detection unit A signal indicating the load current value outputted from 25 and the reference value setting section 23
A load current comparison section 27 outputs a control command signal for adjusting the gap between unrolling 11-a and 11-b by comparing it with a signal indicating a theoretical load current value from the load current comparison section 27; The gap adjustment motor 17 is driven based on the control command signal output from the section 27 to remove the rolls 11-a and 11-b.
A drive control section 28 that adjusts the gap, and an operation section 29 that includes a switch and the like for manually adjusting the gap between the unrolled parts 11-a and 11-b.
It consists of.

In addition, y= in the graph shown in FIG.
In a region other than the automatically controllable region that can be approximated by the equation ax + b, for the region where the opening degree of the supply valve 13 is smaller than the above automatically controllable region,
Since there is little change in the theoretical load current value with respect to the opening degree of the supply valve 13, there is a risk that the control error will become large, and if the opening degree of the supply valve 13 is small, the Since the amount of paddy supplied is small, the gap between the de-rolls 11-a and 11-b must be made small, and depending on the control, there is a risk that the de-rolls 11-a and 11-b will come into contact and wear out. There is also.

Furthermore, the supply valve 13 is lower than the automatically controllable area.
In the region where the opening degree of It cannot be used for control.

The operation of this embodiment will be described below with reference to the drawings.

First, the opening degree of the supply valve 13 provided at the lower part of the rice funnel 9 is adjusted to remove the rolls 11-a, 1.
The efficiency standard is set so that the amount of paddy supplied to 1-b and the amount of grain sorted by the sorter 7 are balanced,
At this time, the gap between the unrolling parts 11-a and 11-b is adjusted so that a predetermined unrolling ratio (for example, 90%) is achieved by controlling the first
Adjustment is made by setting the changeover switch SW-1 to the MANU side and operating the second changeover switch SW-2 to drive the gap adjustment motor 17. After the motor 15 starts driving, the paddy put into the paddy funnel 9 is supplied to the derollers 11-a and 11-b via the supply valve 13, and between the derollers 11-a and 11-b. The grains removed while passing through are transported by a grain lifting machine 5, supplied to a sorter 7, and sorted by a swinging sorter 8.

On the other hand, the de-rolling gap adjustment control device 19 detects the load current of the motor 15 and the opening degree of the supply valve 13 during the series of sorting operations described above, and adjusts the de-rolling gap so that the rate of de-rolling is always maintained at 90%. Based on the equation y=ax+b in the experimental graph shown in
Although the gap between the unrolled rollers 11-a and 11-b is automatically adjusted, the control operation of the unrolled gap adjustment control device 19 will now be described in detail.

The opening degree of the supply valve 13 is detected by the supply valve opening degree detection section 31 in the reference value setting section 23, and the detection signal K _S is sent to the first and second comparators 24- a and 24-b, and before driving the oscillating sorting device 1, the variable resistor VR-
1 is compared with the upper limit K _U and lower limit K _L of the opening range of the supply valve 13 in the angle controllable region for maintaining the escape ratio at 90%. When the detection signal K _S is outside the upper limit K _U or lower limit K _L of the automatically controllable region, the output signal level of the first and second comparators 24-a and 24-b Since one of these becomes high level (H), a low level (L) signal is applied to the A input terminal of the AND circuit 28-a of the drive control section 28 via the NOR circuit 24-c, and the AND
Since the output signal level of the circuit 28-a becomes a low level (L) and the transistor TR-1 becomes non-conductive, the drive control section 28 displays an automatic control display indicating that proper automatic control is being performed. Turn off the lamp 33 and close the current supply valve 13.
Inform the operator that it is impossible to automatically control the escape rate to 90% with the opening of AND
NOR is also applied to the A input terminals of circuits 28-b and 28-c.
Since a low level (L) signal is applied via the circuit 24-c, the AND circuits 28-b and 28-c
By turning off the gate of the transistor TR-2 and TR-3, the transistors TR-2 and TR-3 are prevented from conducting. Conversely, when the detection signal K _S is within the automatically controllable region, the output signal levels of the first and first comparators 24-a and 24-b are both low level (L). Therefore, the drive control section 28
A high level (H) signal is applied to the A input terminal of the AND circuit 28-a via the NOR circuit 24-c, and the output signal level of the AND circuit 28-a becomes high level (H). , transistor
Since TR-1 becomes conductive, the drive control unit 28 lights up the automatic control display lamp 33 to indicate that proper automatic control is being performed, and indicates that the current opening degree of the supply valve 13 is At the same time, a high level (H) signal is sent to the A input terminals of the AND circuits 28-b and 28-c via the NOR circuit 24-c. Therefore, the AND circuit 28-
B of the AND circuits 28-b and 28-c by opening the gates of the AND circuits 28-b and 28-c.
When a high level (H) signal is applied to the input terminal from a load current comparator 27, which will be described later, the output signal level of the AND circuits 28-a and 28-b is set to high level (H), and the transistors TR-2, TR−
Since the voltage is applied to the base terminal of 3, the transistor
TR-2 and TR-3 are brought into conduction to drive the gap adjustment motor 17. Note that the outputs of the first and second comparators 24-a and 24-b of the control region detection section 24 are biased with a negative voltage via resistors 24-c and 24-d, respectively, and similarly, The first and second comparators 27-a and 27-b in the load current comparator 27 are also biased with a negative voltage via resistors 27-e and 27-f, respectively.

On the other hand, the opening detection signal K _S of the supply valve 13 is
It is also applied to the amplifying section 23-a of the reference location setting section 23. In the amplifier 23-a, the degree of amplification is determined by the input x, that is, K, based on the experimental graph shown by y=ax+b shown in FIG. This is set in advance by variable resistor VR-2 so that _S is multiplied by a. Then, the output signal Sax is combined with the signal Sb indicating the value corresponding to b in the experimental graph indicated by y=ax+b above, which is output by setting the variable resistor VR-3, and the adder 23-
It is added by b. Therefore, the adder 23
-b output signal Sy is y corresponding to the above experimental graph y=ax+b for the detected valve opening degree.
, that is, the theoretical load current value of the motor 15 at which the escape rate is 90%. The output signal
Sy (hereinafter referred to as "first comparison signal Sy") is applied to the inverting input terminal (-) of the first comparator 27-a of the load current comparator 27, and is further applied to the variable resistor VR-
4 and applied to the non-inverting input terminal (+) of the second comparator 27-b of the load current comparison section 27 (second comparison signal Sy'). In addition,
The second comparison signal Sy' indicates that the escape rate is greater than the detected opening degree of the supply valve 13 indicated by the first comparison signal Sy.
This shows the load current value obtained by subtracting the allowable range level set in advance by the variable resistor VR-4 from the theoretical load current value of 90%.

On the other hand, the load current of the motor 15 is detected by the current transformers C and T of the load current detection section 25, and the load current is detected by the converter 25-
After converting into the voltage signal V _M at a, the load current comparator 2
7 first and second comparators 27-a and 27
-b is supplied to the non-inverting input terminal (+) and inverting input terminal (-), respectively, so that the first and second
The comparators 27-a and 27-b compare the theoretical load current value of the motor 15, which should have an escape rate of 90%, and the above-mentioned load current based on the experimental graph of y=ax+b from the detected opening degree of the supply valve 13. A comparison is made with the load current value of the motor 15 actually measured by the detection unit 25.

First and second comparators 27-a and 27-
In the comparison in b, if the signal V _M indicating the actually measured load current value of the motor 15 is within the range of the first and second comparison signals Sy and Sy', that is, the actually measured load current is within the range of the supply valve at that time. y=ax+b at 90% removal for opening degree of 13
If the theoretical load current value obtained from the experimental graph is within the allowable range, both output signal levels become low level (L), and the low level (L) signal is delay circuit 2
AND circuits 28-b and 28- of the drive control section 28 through 7-c and 27-d, respectively.
Since it is supplied to the input terminal of c, the AND circuit 2
The outputs of 8-b and 28-c are low level (L)
In this state, transistors TR-2 and
Since TR-3 is in a non-conducting state, the opening adjustment motor 17 of the supply valve 13 is not driven. said signal
When V _M is larger than the first comparison signal Sy, that is, the detected load current of the motor 15 is the theoretical load current determined from the experimental graph when the escape ratio is 90% with respect to the opening of the supply valve 13 at that time. If the value is greater than the value, the first and second comparators 27
The outputs of -a and 27-b become H and low level (L), respectively, and are passed through the AND circuit 28- of the drive control unit 28 through the first and second delay circuits 27-c and 27-d, respectively. b and 28
Since it is applied to the B input terminal of -c, if the opening degree of the supply valve 13 is within the upper limit K _U and lower limit K _L of the opening range, the output signal of only the AND circuit 28-b will be at a high level ( H), the transistor TR-2 becomes conductive and the first relay section 2
8-d is turned on, and derolling 11-a and 1
Since the gap adjustment motor 17 is driven in such a direction that the gap 1-b becomes larger, that is, in a direction that reduces the load current of the motor 15, the load current of the motor 15 is set according to the above-mentioned theory that the omission rate should be 90%. It is controlled to approach the load current value, and the escape rate is maintained at 90%.

Conversely, when the signal V _M is smaller than the second comparison signal Sy', that is, when the detected load current of the motor 15 is 90% of the escape ratio with respect to the opening degree of the supply valve 13 at that time, the experimental graph is shown. When the load current value is smaller than the theoretical load current value determined from Since the voltage is applied to the B input terminals of AND circuits 28-b and 28c via the first and second delay circuits 27-c and 27-d, respectively, the opening degree of the supply valve 13 is at the upper limit of the opening range K _U
and within the lower limit K _L , the drive control unit 28
Since the output signal of the AND circuit 28-c becomes high level (H), the transistor TR-3 becomes conductive, the second relay section 28-e is turned on, and the unrolling circuits 11-a and 11 Since the gap adjustment motor 17 is driven in a direction such that the gap -b becomes smaller, that is, in a direction that increases the load current of the motor 15, the load current of the motor 15 is
It is adjusted to approach the theoretical load current value, which should be 90%, and the escape rate is maintained at 90%.

Note that 43 is a driving power source for the gap adjustment motor 17. Further, the reference number 45 of the operation part 29 is a relay that becomes conductive when paddy is present in the paddy funnel 9, and the reference number 47 starts supplying the paddy from the paddy funnel 9 to the unrolling 11-a, 11-b. This is a supply start switch for

Therefore, according to this embodiment, the opening degree of the supply valve is detected and the relationship between the opening degree of the supply valve and the theoretical load current of the rotary drive motor for derolling at a predetermined derolling rate determined in advance is determined. Based on this, calculate the theoretical load current value of the roll-removal drive motor that performs de-rolling at a predetermined ejection rate at the detected opening degree, use it as a reference, and compare it with the actually measured load current value of the roll-removal drive motor. As a result, the derolling gap is adjusted only in the automatically controllable range of the theoretical load current value of the motor, so the opening degree of the supply valve cannot be automatically controlled in the small range and the large range. By using the theoretical load current value that is not used, it is possible to maintain a predetermined evasion rate with high accuracy and responsiveness in response to changes in the opening degree of the supply valve.

Since this invention is as set forth in the above claims, in a region other than the automatically controllable region of the theoretical load current value, in a region where the opening of the supply valve is smaller than the automatically controllable region, the opening of the supply valve is Even if the change in the theoretical load current value with respect to temperature is small, the control error does not become large. Moreover, if the opening degree of the supply valve is small, the amount of paddy supplied to the deroller is also small, so even if the gap between the derollers must be made small, the derollers will come into contact with each other and wear out. Never. In addition, in the region where the opening degree of the supply valve is larger than the region where automatic control is possible, even if there is an unstable factor where it is necessary to frequently adjust the gap between derolling due to the inability to obtain a stable load current to the motor. By using the theoretical load current value without automatic control, it is possible to carry out deworking while maintaining a high demolition rate, thereby improving the mass productivity of brown rice.

This invention is not limited to the embodiments described above, and may be implemented in other embodiments by making appropriate changes.

[Brief explanation of drawings]

Figure 1 is an overall schematic diagram of the swing sorting device, Figure 2 is a configuration example of the derolling gap adjustment control device, and Figure 3 is the lower part of the paddy funnel that limits the supply of paddy to the derolling when the derolling rate is 90%. FIG. 2 is an experimental graph showing the relationship between the load current of the rotational drive motor for derolling and the opening degree of the supply valve provided in FIG. Explanation of symbols representing main parts of the figure, 11-
a, 11-b... De-rolling, 3... Husking machine, 1
5...Motor, 19...Derolling gap adjustment control device.

Claims (1)

[Claims] 1 The paddy is supplied to the derolls 11-a and 11-b, and the hulling machine 3, which removes the paddy, adjusts the amount of paddy supplied to the derolls 11-a and 11-b to a constant derolling rate. The theoretical load current value can be automatically controlled in the automatic evasion rate control device based on a comparison between the theoretical load current value determined for the above-described load current value and the load current value of the electric motor 15 that rotationally drives the derolling devices 11-a and 11-b. De-roll the areas 11-a, 11-b
In order to maintain the constant shedding rate, the derolling area 11-a, 11 is defined as an area excluding a small amount supply area below a predetermined position of the supply valve 13 that adjusts the amount of paddy supplied to the feed valve 13 and a large amount feed area above a predetermined position of the feed valve 13. An automatic removal rate control device characterized by having a removal rate adjustment control device 19 for adjusting the gap -b.