JPS6214949A - Gluten removing rate controller for rice huller - 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 (Field of Industrial Application) The present invention relates to a device for controlling the dehulling rate by adjusting the roll gap of a huller.

(Prior art) When a hulling roll is used for a long period of time, the roll surface wears out, the gap between the rolls increases, and the dehulling rate decreases.

Furthermore, even if the roll gap is the same, the grain size differs depending on the type of grain, so the dehulling rate will also vary depending on the type of grain.

Therefore, in order to continue grinding rice at a constant dehulling rate, it is necessary to adjust the roll gap by appropriately moving the rotating shaft of the hulling roll.

For this reason, conventional dehulling rate control detects the actual dehulling rate during hulling work, compares this with the target dehulling rate, and automatically adjusts the roll gap so that the deviation becomes zero. The device is known.

(Problem to be Solved by the Invention) By the way, the dehulling rate is detected by taking out the grains discharged from the hulling rolls to the sensor, so if the roll gap is changed, the change in the dehulling rate is detected by detecting the grains by the sensor. It will appear in the detection results with a delay of the time it takes to take it out.

Therefore, when changing the roll gap, the roll gap may be changed excessively in the conventional case due to the delay in detection even though the actual removal rate has reached the target removal rate. However, since such excessive overshooting must be corrected to settle to the target demolition rate, the roll gap cannot be easily determined at a constant level, which results in wasted time for control.

The present invention aims to improve such conventional drawbacks, and aims to correctly control the roll gap in a short time by avoiding excessive changes when changing the roll gap.

(Means for understanding the problem) Therefore, the present invention does not depend on the de-walling rate, which inevitably causes a time delay in detection while changing the roll gap.

The timing to stop changing the roll gap is determined based on the load on the hulling rolls. However, even if the roll load is the same, the dehulling rate may differ depending on the grain variety, and the two do not necessarily match. Therefore, even if you temporarily stop moving the rolls and fix the roll gap based on the roll load, ,
After a certain period of time has elapsed, the removal rate is detected again, and if the removal rate deviates from the target removal rate, the roll gap is changed again.

That is, the present invention is characterized in that the rotation axis of the hulling roll starts to move based on the detection result of the dehulling rate, and the movement of the rotation axis of the hulling roll is stopped based on the detection result of the load on the roll rotation motor.

This will be explained with reference to the functional block diagrams of the present invention shown in FIGS. 1 to 3.

Figure 1 shows the first invention described in claim 1, in which 1 is a dehulling rate sensor that detects the dehulling rate by distinguishing between paddy and brown rice contained in the mixed grain after hulling. be.

Reference numeral 2 denotes a set demolition rate output means for outputting signals corresponding to the upper and lower limits of the set target demolition rate band, and this is connected to the demolition rate comparison means 3 together with the demolition rate sensor 1.

A roll moving motor m is provided which moves the rotation axis of the hulling roll to adjust the roll gap, and a timer 4 outputs a standby signal for a certain standby time t after the motor m has stopped.
and the output side of the comparison means 3 are connected to the roll movement motor drive means 5.

This driving means 5 determines, based on the judgment signal of the comparing means 3 and the standby signal of the timer 4, when a certain period of time has passed since the roll movement motor m stopped, and when the demolition rate deviates from the target demolition rate band. In this case, a roll movement motor drive signal is outputted to rotate the roll movement motor m forward or reverse so that the removal rate falls within the target removal rate band.

Next, the load on the hulling roll is transferred to the rotation motor M of the hulling roll.
A roll load detection means 6 is provided to detect the load current from the load current, and based on the detection signal of the detection means 6, a roll movement motor stop signal is output when the roll load variation exceeds a predetermined value. Means 7 is provided.

Then, the roll movement motor drive means 5 and the roll movement motor stop means 7 are connected to the roll movement motor control means 8,
Accordingly, the second invention described in claim 2, in which the roll movement motor m is controlled based on the roll movement motor drive signal and the same stop signal, is used as a demolition rate sensor, as shown in FIG.

A dehulling rate sensor 9 of a specified number of grains type is used, which identifies paddy and brown rice contained in the mixed grains after hulling, and outputs a detection signal of the dehulling rate when the number of identified mixed grains reaches a specified number.

A timer 10 that outputs a standby signal during a standby time proportional to the output cycle of the sensor 9 is connected to this sensor 9, and the standby time during which the roll gap is not changed is extended or shortened according to the output cycle of the sensor 9. .

A third aspect of the invention described in claim 3 includes, in addition to the first aspect, a 20-hole gap adjustment mechanism that operates only when switching the target de-entrainment rate zone.

As shown in FIG. 3, this second adjustment mechanism is configured to adjust the demolition rate to convert the target demolition rate band into the corresponding load of the roll rotation motor M based on the output signal of the set demolition rate output means 2. /Roll load conversion means 11, and roll load comparison means 1 for comparing the converted roll load outputted by the conversion means 11 with the actual roll load outputted by the roll load detection means 6.
2, and further based on the determination signal of the roll load comparison means 12, a roll movement motor drive signal for rotating the roll movement motor m in the forward or reverse direction so that both roll loads are equal, is set within the target rod removal rate band. and a roll movement motor second drive means 13 that outputs the output for a certain period of time after being set.

(effect) Next, the control procedure according to the present invention will be explained.

The theory during the hulling work? ! Goal theory that the rate increases or decreases?
! If the rate falls outside the rate range, the outputs of the de-school rate sensor 1 and the set de-school rate output means 2 are compared, and the de-police rate comparison means 3 outputs a determination signal.

Based on this determination signal, a drive signal is output from the roll movement motor drive means 5, the roll movement motor control means 8 is operated, the roll movement motor m starts rotating, and the roll gap is changed to wide or narrow.

When the roll gap changes, the load current flowing through the roll rotation motor M changes accordingly. Therefore, the roll load is detected by the roll load detection means 6 based on the amount of change in the load of the motor M, and when the amount of change reaches a specified value, a roll movement motor stop signal is output from the roll movement motor stop means 7, and the roll is moved. Stop motor m and fix the roll gap.

When the roll movement motor m stops in this manner, the timer 4 outputs a standby signal only for a certain standby time t after the stop.

While the standby signal is being output, even if the removal rate of the removal rate sensor l still deviates from the target removal rate band, the roll movement motor drive signal is not output from the roll movement motor drive means 5. No output.

When the waiting time t has passed and the standby signal disappears, the same roll gap adjustment as described above is performed in accordance with the comparison result of the re-outputs of the demolition rate sensor 1 and the set demolition rate output means 2.

The above is the first invention, and the method of determining the waiting time t is different between this and the second invention.

In the second aspect of the invention, the de-machining rate sensor 9 outputs a de-machining rate detection signal for each of the predetermined number of mixed grains, and determines the standby time t in proportion to the output cycle.

Therefore, when the number of mixed grains detected by the demolition rate sensor 9 is small, the output cycle of the detection signal is long, and the waiting time t is also long.

The third invention is when switching and changing the target detraining rate band,
The method of adjusting the roll gap is different from the first invention.

In the third invention, only immediately after switching the target detraining rate band,
The target detraining rate band after switching is converted into a roll load by the load of the roll rotation motor M by the detraining rate/roll load conversion means 11, and the converted roll load and the actual roll load by the roll load detection means 6 are calculated. While comparing, the roll moving motor m is driven to adjust the roll gap so that the two match.

(Example) Next, the present invention will be explained in detail.

FIG. 4 is a front view of the main parts of the hulling machine, in which a pair of hulling rolls 20 and 21 are mounted on left and right parallel shafts, and the rotating shaft of one of the rolls 20 is supported by a rotating arm 22.

Then, by rotating the screw rod 23 screwed back into the swing arm 22 in the forward or reverse direction by the roll moving motor m, the swing arm 22 is turned left and right about its fulcrum 24, and the roll 20 is directed toward the other roll 21. Adjust the gap between the two rolls by moving them closer together or farther apart.

25 indicates a hopper that feeds grain into the nip between the rolls.

The dehulling rate sensor l shown in the block diagram of Figure 5 samples the mixed grains discharged from the huller, passes it between the photocouplers provided in the sensor, and uses the property that brown rice transmits light better than paddy rice to extract the grains. In addition to identifying brown rice as brown rice, we also detect the de-hulling rate from the total number of grains sampled.

The set demolition rate output means 2 has a polyurethane switch, and when setting the target demolition rate band to 85%, for example, the upper limit is 87.5% and the lower limit is 82.5%. Output voltage values corresponding to those values.

The roll load detection means 6 includes a current transformer interposed in the power supply circuit of a roll rotation motor M (not shown) that rotates the rolls 20 and 21, and detects the roll load from the load current flowing through the motor M.

These demolition rate sensors 1. The set de-entrainment rate output means 2 and the roll load detection means 6 are connected to a microcomputer 27 via an input interface 26, and a roll moving motor m is connected to the output side thereof via an output interface 28.

As shown in the functional block diagram in FIG. For example, as shown in Fig. 6, the actual demolition rate is 87.5%, the upper limit of the target demolition rate band indicated by the diagonal line.
At that point (time tl), the roll movement motor drive means 5 outputs a remote drive signal, and the roll movement motor control means 8, such as a relay switch on the output side of the microcomputer 27, is operated to move the roll. motor m
Reverse.

As a result, the gap between the rolls 21 and 22 increases, the load current of the roll rotation motor M decreases, and as a result, the roll load increases to α
When the roll movement motor m is lowered by a certain amount, the roll load detection means 6 detects this, and a stop signal is output from the roll movement motor stop means 7 built in the microcomputer 27, and the reverse rotation of the roll movement motor m is stopped.

When the roll movement motor m stops, at that point (time t2)
By a more constant waiting time T, the microcomputer 27
A standby signal is output from the built-in timer 4. As long as the standby signal is being output, the roll movement motor driving means 5 will not output a drive signal even if the removal rate deviates from the target removal rate.

When the waiting time T has elapsed and the waiting time stops being output (time t3), the dropout rate is still 87.5% of the target.
If it exceeds , the roll movement motor drive means 5
Then, a drive signal is output again, and the roll moving motor m is reversely rotated until the roll load is reduced by α, further expanding the roll gap.

On the contrary, the dropout rate is the lower limit of the target dropout rate band of 82.
If it falls below 5%, at that point (time to), a motor drive signal is output from the roll movement motor drive means 5, the roll movement motor m is rotated in the forward direction, and the gap between the rolls 21 and 22 is narrowed. As the load increases by α, as in the reversal case.

The roll moving motor m stops and a standby signal is output.

This is the control procedure of the embodiment of the first invention, and FIG. 7 shows this in the form of a flowchart.

FIG. 7 shows a case in which the demolition rate is calculated using 100 sample mixed grains.

Next, in the second invention, a demolition rate sensor 9 of a specified grain number type is provided, which outputs a detection signal every time the number of mixed grains passing through a photocoupler of the demolition rate sensor reaches a specified number (for example, 100 grains). use FIG. 8 shows the relationship between the flow rate of mixed grains passing through this sensor (the number of grains per unit time) and the response time of the sensor (ie, the output period of the detection signal).

As is clear from FIG. 8, in a region where the flow rate of the mixed particles passing through is less than the saturation value, the response time of the sensor varies widely depending on the flow rate.

Therefore, in the embodiment of the second invention, the waiting time T is set to ta or tb by the timer 10 of FIG. b).

For example, when the target withdrawal rate band is set to 85% as described above, the withdrawal rate band is set to 85%. ! - Assuming that the output point of the detection signal of the rate sensor changes as plotted in Figure 9, if the gap between adjacent output points is narrow, that is, if the response time of the sump is fast, the waiting time is short at ta. , conversely, when the gap between the output points is wide, the waiting time becomes longer by tb.

FIG. 10 shows a flowchart of this embodiment of the second invention.

Next, in the embodiment of the third invention, from the graph of the appearance frequency of roll loads with a specific demolition rate (for example, 80%, 85% or 90% demolition rate) as shown in FIG. FIG. It is written in the deburring rate/roll load conversion means 11.

As shown in Figure 12, the diagonal lined target accompaniment rate band is 8.
When switching from 5% to 90%, the converting means 11 outputs a roll load value C corresponding to a post-switching removal rate of 90%, and combines this value C with the actual roll load detected by the roll load detecting means 6. are compared in the roll load comparison means 12, and the roll gap is adjusted by outputting a drive signal from the roll moving motor second drive means so that the deviation between the two becomes zero, that is, so that the actual roll load becomes the value C. Adjust.

When the actual roll load reaches the value C, wait for time Tm, and then adjust the roll gap using the same procedure as in the first invention.

For example, as shown in FIG. 12, at time t5 when the actual debinding rate falls below the target debinding rate band, the roll gap is adjusted to be narrower until the roll load increases by α, and then the roll gap is adjusted for a waiting time T. to be fixed.

FIG. 13 shows a flowchart of an embodiment of the third invention.

(Effects of the Invention) As explained above, in the present invention, whether or not the roll gap should be changed is determined according to the detection signal of the removal rate sensor, that is, the actual removal If! If the rate deviates outside the target rate band, this is detected by the rate sensor and changes are made to enlarge or reduce the roll gap.

However, stopping the moving rolls in order to change the roll gap is not based on the removal rate sensor but on load detection of the roll rotation motor. In other words, if the load on the roll rotation motor increases or decreases by a certain value α as a result of changing the roll gap, this is detected by a roll rotation motor load detector such as a current transformer, the rolls are temporarily stopped, and the roll gap is fixed. do. Then, after the waiting time T has passed, the roll gap is changed by the motor load value α again as necessary, and this process is repeated, because any increase or decrease in the load on the roll rotation motor can be immediately detected in conjunction with the change in the roll gap. Even if the change of the roll gap is interrupted, according to the present invention, overcontrol caused by a delay in detecting the control result can be avoided, and therefore, the roll gap is not changed too much, so it is not possible to overshoot as in the conventional case. Compared to control that approaches the target while making corrections, it is possible to quickly settle to the target value as a result, resulting in the effect that the deburring rate can be controlled accurately and with high efficiency.

In addition, in the second invention, the waiting time T is adjusted in proportion to the output cycle of the detection signal of the demolition rate sensor, that is, the sensor response time, so if the sensor response time is fast, the waiting time is shortened, which is the target. This also has the effect of allowing the rate of de-blocking to be set more quickly, and since the waiting time is extended if the response time is slow, it is possible to accurately control the rate of de-blocking based on the correct rate of de-blocking.

Furthermore, in the third invention, when switching the setting of the target dropout rate,
Since the actual roll load is changed all at once to the roll load value stored in advance in the demolition rate/roll load conversion means, the time required to adjust the roll gap when changing the set demolition rate can be shortened, further improving efficiency. This effect also occurs.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the first invention described in claim 1, FIG. 2 is a functional block diagram of the second invention also described in claim 2, and FIG. A functional block diagram of the third invention described in Section 3, FIG. 4 is a front view of main parts of a hulling machine according to an embodiment of the present invention, FIG. 5 is a block circuit diagram thereof, and FIG. 6 is an implementation of the first invention. FIG. 7 is a flowchart showing the control procedure of the embodiment of the first invention, and FIG. , a graph showing the relationship between the flow rate of mixed grains and the response time of the sensor, FIG. 9 is a graph showing the relationship between the demolition rate and roll load in the embodiment of the second invention, and FIG. A flowchart showing the control procedure of the example, FIG. 11 is a graph of the appearance frequency of roll load with the demolition rate as a parameter, and FIG. 12 is a graph showing the relationship between the demolition rate and roll load in the embodiment of the third invention. , FIG. 13 is a flowchart showing the control procedure of the embodiment of the third invention. 1 and 9 are demolition rate sensors; 2 is a predetermined demolition rate output means;
3 is a demolition rate comparison means, 4 and 10 are timers, 5 is a roll movement motor drive means, 6 is a roll load detection means, 7 is a roll movement motor stop means, 8 is a roll movement motor control means, and 11 is a demolition rate. /Roll load converting means; 12 is a roll load converting means; 13 is a roll moving motor second drive means. Patent Applicant Iseki Agricultural Machinery Co., Ltd. Agent Toshibe Maki (and 2 others) Figure 7 Figure 10 Procedural Amendment (Own ship August 8, 1985)

Claims (3)

[Claims] (1) A reversible roll movement motor that moves the rotating shaft of the hulling roll to adjust the roll gap, and a dehulling ratio that detects the dehulling rate by distinguishing between paddy and brown rice contained in the mixed grain after hulling. A sensor, a set escape rate output means for outputting signals corresponding to the upper and lower limits of a set target escape rate band, and an escape rate output means for comparing both output signals of the escape rate sensor and the set escape rate output means. (2) rate comparison means, a timer that outputs a standby signal for a certain standby time after the roll movement motor stops, and the roll movement motor stops based on the judgment signal of the comparison means and the standby signal of the timer; When a certain period of time has elapsed and the removal rate deviates from the target removal rate band, the roll moving motor is rotated forward or reverse so that the removal rate falls within the target removal rate band. a roll movement motor drive means for outputting a roll movement motor drive signal for the purpose of the present invention; a roll load detection means for detecting the load on the hulling roll from a load current of the rotation motor of the hulling roll; and based on the detection signal of the roll load detection means, a roll movement motor stopping means that outputs a roll movement motor stop signal when the variation in roll load exceeds a predetermined value; and a roll movement motor that controls the roll movement motor using the roll movement motor drive signal and the stop signal as input signals. A dehulling rate control device for a rice huller, comprising: a control means; (2) A roll movement motor that can be rotated forward and backward to adjust the roll gap by moving the rotation axis of the hulling roll, and a motor that distinguishes between paddy and brown rice contained in the mixed grains after hulling and removes each of the specified number of mixed grains. ■An omission rate sensor that detects the omission rate; a set omission rate output means that outputs a signal corresponding to the upper and lower limits of a set target omission rate band; the said omission rate sensor and the set omission rate output means. a timer that outputs a standby signal during a standby time proportional to the output cycle of the output signal of the scraping rate sensor after the roll moving motor is stopped; Based on the determination signal of the comparison means and the standby signal of the timer, when a certain period of time has passed since the roll movement motor stopped, and when the removal rate deviates from the target removal rate band, the removal rate is determined. A roll movement motor drive means that outputs a roll movement motor drive signal to rotate the roll movement motor in forward or reverse rotation so that the dehulling rate falls within the target dehulling rate band; roll load detection means for detecting the roll load; roll movement motor stop means for outputting a roll movement motor stop signal when the variation in roll load exceeds a predetermined value based on the detection signal of the roll load detection means; A removal rate control device for a hulling machine, comprising: a roll movement motor control means for controlling a roll movement motor using a motor drive signal and a stop signal as input signals. (3) A reversible roll movement motor that moves the rotating shaft of the hulling roll to adjust the roll gap, and a dehulling ratio that detects the dehulling rate by distinguishing between paddy and brown rice contained in the mixed grain after hulling. A sensor, a set escape rate output means for outputting signals corresponding to the upper and lower limits of a set target escape rate band, and an escape rate output means for comparing both output signals of the escape rate sensor and the set escape rate output means. (2) rate comparison means, a timer that outputs a standby signal for a certain standby time after the roll movement motor stops, and the roll movement motor stops based on the judgment signal of the comparison means and the standby signal of the timer; When a certain period of time has elapsed and the removal rate deviates from the target removal rate band, the roll moving motor is rotated forward or reverse so that the removal rate falls within the target removal rate band. a roll movement motor drive means for outputting a roll movement motor drive signal for the purpose of the present invention; a roll load detection means for detecting the load on the hulling roll from a load current of the rotation motor of the hulling roll; and based on the detection signal of the roll load detection means, a roll movement motor stopping means that outputs a roll movement motor stop signal when the variation in roll load exceeds a predetermined value; and a roll movement motor that controls the roll movement motor using the roll movement motor drive signal and the stop signal as input signals. and control means, based on the output signal of the set removal rate output means, a removal rate/roll load converting means for converting a target removal rate band into a corresponding load of the roll rotation motor; roll load comparison means for comparing the converted roll load outputted by the conversion means and the actual roll load outputted by the roll load detection means; and a roll movement motor second drive means that outputs a roll movement motor drive signal for rotating the roll movement motor forward or reverse for a certain period of time after setting the target removal rate band. This is a dehulling rate control device for a rice huller.