JPS63194744A - Hulling control method of rice refining machine - 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 [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for controlling milling of a rice milling machine that is capable of controlling milling pressure when milling brown rice.

(Prior art) Conventionally, in a so-called circulation type rice milling machine, in order to mill rice at a constant milling pressure, a resistor is provided in the flow path of the rice grains pushed from the transfer chamber to the pressure chamber, and the resistance of this resistor is The position was controlled so that the semen pressure was constant. This control detects the load current of the main motor that drives the milling rolls, moves the resistor so that this load current falls within a certain range, mills the rice for a certain period of time, and then moves the resistor. They were evacuated to minimize resistance, and the rice bran was removed for a certain period of time.

(Problems to be Solved by the Invention) In the case of the above-mentioned conventional technology, the rice polishing time is constant, and there is a problem in that the polished state varies depending on the state and type of brown rice. In addition, it is complicated to adjust the milling time according to the condition and type of brown rice, and it is also extremely difficult to accurately judge the necessary milling time from the appearance of brown rice, which may result in differences in the milling condition. was unavoidable.

In addition, if milling is carried out for a long time in order to eliminate insufficient milling, there is a problem in that the rice becomes over-milled, resulting in loss of volume due to broken ice and abrasion of the rice grains.

This invention was made in view of the above-mentioned problems of the conventional technology, and is a rice milling machine that can always obtain polished rice of high quality and a constant level of polishing, regardless of the type and condition of the brown rice to be polished. The purpose is to provide a control method.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a method for controlling a resistor so that the milling pressure falls within a certain range, in which the milling pressure is controlled to be constant so that the milling pressure falls within a certain range. After that, the control of the pumping pressure is released, and while the resistor is fixed and pumping is performed, a predetermined number (p, p≧1) of load current values are sampled within a predetermined time (m). Then, a calculated value of this load current value is obtained, and this is repeated for a predetermined time (M) longer than the predetermined time (m), and the calculated value is calculated for this predetermined time (M).
) for a predetermined number of times within a certain range (a)
The rice bran removing operation transition process determines whether or not times can be obtained.

If this is achieved, proceed to the bran removal operation, and if this is not achieved and the predetermined time (M) has elapsed,
Each of the predetermined times (m), (M), and the predetermined number of times (a
) is set to be smaller than the above-mentioned value, and the bran removal operation transition process is performed.

(Function) The rice milling control method of the present invention determines when to shift to the bran removing operation by detecting that fluctuations in the milling pressure have stopped, and starts the bran removing operation in the optimal state with no excess or deficiency. It was designed to move.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The rice polishing machine of this embodiment is a so-called circulation type rice milling machine, and the fourth
As shown in the figure, a transfer chamber 2 is provided in the upper part of a rice polishing machine main body 1, and a milling roll 3 for pressing and transferring rice grains is rotatably attached within this transfer chamber 2. The pumping roll 3 is coaxially connected to a pulley 5 via a shaft 4, and the pulley 5 is connected to a pulley 7 of a main motor 6 via a belt 8.

A rice bran removal screen 9 is attached to the lower part of the transfer chamber 2, and pressure chambers 10, in which milling pressure is applied to the rice grains, are provided at both ends of the transfer chamber 2.
and a rice grain supply port 11 are provided.

A hopper 12 for storing rice grains is fixed above the pressure chamber 10 and the supply port 11. Further, a resistor 13 is rotatably attached to the pressure chamber 10 to provide resistance when the rice grains flow back and apply milling pressure to the rice grains by the pressing force of the milling roll 3. As shown in FIG. 5, this resistor 13 is rotatably provided integrally with a shaft 14 provided perpendicularly to the flow path direction of the rice grains, and this shaft 14 is bent at one end to allow sliding. It engages with the moving member 15. The sliding member 15 is threadedly engaged with a helical shaft 17 that is rotated by a sub-motor 16 that is a resistor drive device, and as the helical shaft 17 rotates, the sliding member 15 moves in the axial direction of the helical shaft 17, and the shaft 1
4 to rotate the resistor 13. Furthermore, limit switches 18 and 19 are provided before and after the movement range of the sliding member 15 to detect the position where the resistor 13 is retracted and does not provide resistance to the rice grains, and the position where the resistance is maximum. .

As shown in FIG. 1, the electric circuit of the rice milling machine of this embodiment is such that the main motor 6 is connected to the AC 100V commercial power source via the power switch 20, and the main motor 6 is connected to the power source. Main motor drive relay 22 in series,
Current transformer (CT) that detects the load current value of the main motor 6
23 are connected.

The output of the current transformer 23 is converted into a digital value by an A/D converter 25 via an amplifier 24, and is input to an input port 27 of a microcomputer 26. Further, to this input port 27, a reference set value for controlling the load current value of the main motor 6, for example, one of the three types of load set values shown in FIG. 7, is selectively input. A load setting input means 28, a rice polishing switch 29 for instructing the start of driving the main motor 6. A limit switch 18 is connected to detect the retracted position (hereinafter abbreviated as O position) of the resistor 13.

The microcomputer 26 includes a CPU 30 and a ROM 31.
, and has a RAM 32, the output of which is sent via an output boat 33 to a sub-motor drive circuit 34 and an LED display 3.
5. Connected to the main motor drive relay 22, each CP
Operates according to commands from U30. The microcomputer 26, sub motor drive circuit 34, and main motor drive relay 22 are each connected to a power supply circuit 36 and receive power.

The milling control of the rice milling machine of this embodiment is digitally processed by the microcomputer 26, and the processing program is stored in the ROM 31 or an external memory (not shown).

As shown in the flowcharts in FIGS. 2 and 3 and the solid line graph in FIG. 6, the milling control of this rice milling machine is performed by first closing the power switch 20, rotating the sub-motor 16 in the reverse direction, and moving the resistor 13 to resist the rice grains. Return to 0 position, which does not give . In this operation, the helical shaft 17 rotates, the sliding member 15 moves to the left in FIG. 4, the shaft 14 rotates clockwise, and the resistor 1
3 in a direction parallel to the flow path of the rice grains. Further, when the resistor 13 reaches the O position, the sliding member 15 turns the limit switch 18 ON, and in conjunction with this, the sub motor 16 is stopped. After that, input the desired setting value of the grinding pressure from the load setting input means 28,
When the rice milling switch 29 is turned on, the main motor 6 is driven and the milling rolls 3 are rotated. Furthermore, at the same time,
Counting of a certain set time t1+Tt is started, and LE
The D display 35 displays the elapsed time of tl and T1.

Then, when the rice milling initial time t□ has elapsed, control of the milling pressure is started. This initial rice milling time t is the milling roll 3
This is a sufficient start-up period for the rice grains to begin to rotate and the circulation of rice grains to be uniform and stable. In the pumping pressure control, the output of the current transformer 23 connected in series to the power supply line of the main motor 6 is amplified by the amplifier 24, further A/D converted and input to the microcomputer 26, and the CPU 30 outputs the output from the current transformer 23 connected in series to the power supply line of the main motor 6. This is done by comparing the load current value and the set value. microcomputer 2
6, the current transformer 2
The load current value of the main motor 6 from 3 is compared with the set value of the load corresponding to the preset pumping pressure, and if the load current value is larger than the set value, the sub motor 6
is reversed and the resistor 13 is rotated in the direction of the O position where it is retracted from the flow path of rice grains.If the load current value and the set value are equal, the resistor 13 is stopped at the same position, and conversely, when the load current value is If the value is smaller than the set value, the sub-motor 16 is rotated in the normal direction to rotate the resistor 13 in a direction that blocks the rice grain flow path. In this way, the pressure for pounding the rice grains is controlled to be within a certain set range, and the pressure for pounding the rice grains is controlled from the ON of the main motor 6 to the T□
After the time has elapsed, the control of the pounding pressure is released and the position of the resistor 13 is fixed in that state. This T1 time is set to the time required to polish brown rice to a certain degree. Thereafter, while performing whitening, a bran removal operation transition process is performed to determine whether or not whitening has been completed.

In the bran removal operation transition process, as shown in the flowchart of FIG. 3 as a subroutine subprogram of the main program shown in FIG. 2, the count N is first set to O while rice is being polished with the resistor 13 fixed.

Predetermined M1 o'clock n! Start measuring J (for example, 4 minutes).

During this M1 time, p (for example, 4) load current values are sampled via the A/D converter 25 every m1 time (for example, 15 seconds). This sampling reads the load current value at 1 second intervals during m1 time. Then, a predetermined calculation process is performed on these p load current values to obtain a calculation value. In this embodiment, an arithmetic average is calculated and stored. Next, this calculated average value is compared with the previously stored average value. At the first time, since the previous data has been cleared, it is determined that the previous and current average values are not equal, and the load current value is sampled again during m1 time in the same manner as above and the average value is calculated. Then, while repeating this, if the current average value and the immediately preceding average value become equal, 1 is added to Karan 1 - Number N. When this count number N reaches al (for example, 4), it is determined that sufficient polishing has been performed, and the process proceeds to the bran removal operation. Here, this count number N is continuously added only when the current average value and the previous average value are equal, and even if the count number N is 1 or more, the next comparison will be If the average values are not equal, the count number N is returned to O. If the count does not reach 4 during the judgment of this rice bran removing operation transition processing for M3 hours (4 minutes),
That is, the average value was taken M,/rn times (16 times in this case) during the M□ waiting time and compared with the value immediately before each time, but the equal average of the values was taken 81 times (4 times) in a row. If no value is obtained, the process moves to the next bran removal operation.

Here, when the load current values at regular intervals are the same four times in a row, it is determined to proceed to the bran removal operation.As the milling of the rice grains progresses, the milling pressure gradually increases as shown in Figure 6. decreases, and the load current value of the main motor 6 also decreases. When polishing has been carried out sufficiently, the polishing pressure becomes almost constant. Therefore, in order to detect this, the above-mentioned bran removal operation transition process is performed.

In the next rice bran removal operation transition process, the processing time is set to M2 time (for example, 3 minutes), which is shorter than M1 time, and the sampling of the load current value is performed for 1 second between m1 time and m2 time (for example, 6 seconds), which is shorter than M1 time. Do it at intervals.

Then, in the same way as mentioned above, p pieces (4 samples) are sampled at 1 second intervals within m2 time, the average value is calculated, and this is stored. A comparison between the average value and the immediately preceding average value is performed in the same manner as in the bran removal operation transition process described above. Here, the criterion for transitioning to the bran removal operation is that the average value is 82 (for example, 3) consecutively.
It is assumed that the values are the same, and the transition is made to a smaller number than the above-mentioned a. In this way, within M2 time, the same process as the above-mentioned bran removal operation transition process is performed with each numerical value reduced, and the average value is obtained for a maximum of M27m2 times (30 times), and the average value immediately before that is calculated. Compare with. Even in this rice bran removal operation transition process, if the average value of the load current values does not become equal 82 times in a row within M2 hours, the process proceeds to the next rice bran removal operation transition process.

Here, the sampling period m2 of this bran removal operation transition process is
．． The reason why the set time M2 and the number 82 of the rice bran removal movement standards are made smaller than those described above is to make the transition to the rice bran removal operation easier than in the case described above.

This is because the resistor is stopped at the position where the load is applied and the polishing operation is being performed while transitioning to the bran removal operation, so the polishing time T1 + M□ hours has already passed, and the polishing that is normally required is It is thought that this is done, and this is to prevent over-eating. Also, the reason why the average load current value is not constant even though the rice has been milled sufficiently is that the stability varies depending on the type of rice, grain temperature, moisture content, etc. This is because there is rice for which the pressure is not constant. Therefore, as described above, the criterion for transitioning to the bran removal operation is relaxed to allow the transition to the bran removal operation to be made easier, thereby preventing the rice from being crushed or losing weight due to over-milling. Furthermore, if the rice is over-milled, the milling pressure will actually start to rise, and the harmful effects such as broken rice will become more serious.
Judging the completion time of milling is also important in terms of the quality of milled rice.

In the next rice bran removing operation transition process, further, ``double judgment value M
Ma of a value smaller than 2, m2, a2 (for example, 2 minutes)
, m3 (for example, 4 seconds), a, (for example, twice) are determined, and based on these, the same bran removal operation transition process as described above is performed. As a result, if the average value of the load current value becomes equal twice in a row, the bran removing operation is started. Also, if the rice bran removal operation does not start within M3 hours even after this, M
After 3 hours have passed, the rice bran removal operation begins. The reason why each judgment value in this bran removing operation transition process is made smaller than those described above is to prevent over-polishing, as described above. Furthermore, after M3 hours, the entire process was shifted to rice bran removal because sufficient polishing was done during M□10M2+M3 hours, together with the T time, and this is also due to over-polishing. This is to prevent this.

When the rice bran removal operation is shifted to the rice bran removal operation by the rice bran removal operation transition process, the rice bran removal time T2 is set and the rice bran removal time begins. During bran removal, the main motor 6 is rotated with a small load to remove the bran, so first the sub motor 16 is reversed and the resistor 13 returns to the zero position. When the predetermined amount of rice bran removal is completed, the main motor 6
stops.

In addition, in this pumping control, all operations are stopped when the power switch 20 is turned OFF, and when the power switch 20 is turned ON again, the sub motor 16 is always reversed in conjunction with this, and the resistor 13 is returned to the O position and reset. be done. Until the resistor 13 returns to the ○ position, the main motor 6 will not rotate even if various operation switches such as the rice polishing switch 29 are pressed. Therefore, when the polishing operation is to be stopped in the middle, the power switch 20 is turned off, and when the polishing operation is to be performed again, the polishing operation is always started with the resistor 13 at the 0 position.

Further, the power switch 20 is turned ON, and a monitor lamp (not shown) lights up to display the operating state from the time when the sub motor 6 starts to rotate in reverse until the grinding pressure becomes 0.

According to the milling control method of the rice milling machine of this embodiment, milling is performed for a certain period of time by controlling the milling pressure to be within a certain range, and then the resistor is fixed at that position and polishing is performed. Since it detects the point where the milling pressure becomes constant and shifts to the bran removing operation, it can shift to the bran removing operation at the most appropriate milling time, eliminating unnecessary milling and preventing the harmful effects of excessive milling. be able to. Furthermore, in this example,
The determination of whether the rice grains have been polished is determined at regular intervals and the criteria are made progressively looser, so even if the milling pressure is not constant even if the rice grains have been milled sufficiently, due to differences in the type and condition of the rice grains. , it is possible to move on to the bran removal operation in a necessary and sufficient polishing time to avoid over-polishing. In addition to the method of controlling the milling of the rice milling machine of the present invention, in addition to using a microcomputer, it may also be performed by constructing a logic circuit or by analog judgment and control.

In addition, in the rice bran removing operation transition process, the set time M□, the sampling period m1, the number of samples P, and the sampling interval can be arbitrarily set, and the equal average is the criterion for transitioning to the rice bran removing operation. The number of times 81 a value is obtained can also be set as appropriate. Furthermore, in the second and subsequent bran removal operation transition processes, the M1, ml, a
It is sufficient to make a judgment by reducing at least one value among l, and it is not necessarily necessary to reduce all the values.From the third time onwards, the rice bran removing operation transition process is performed by making the above value the same as the second time. The determination may be continued until the calculated value satisfies a certain condition, without dividing it by a certain period of time.

In addition, the calculated value of the sampled load current value can be calculated not only by the arithmetic average but also by simple addition, various other calculation methods, and average value calculation methods. may be a digital value obtained by simply A/D converting the load current value, or an analog value obtained by amplifying the load current value itself.

Furthermore, whether or not the pumping pressure is constant may be determined as long as the calculated value is within a predetermined range.
The calculated values to be compared do not necessarily have to be equal.

〔Effect of the invention〕

The method of controlling the milling quality of the rice milling machine of the present invention is to control the milling pressure for a certain period of time so that it falls within a certain range, and then,
This control is released and while polishing is performed with the resistor fixed, it detects that the polishing pressure is within a certain range and shifts to the bran removal operation, so the rice bran removal operation is performed in the most appropriate condition. can be moved to. Therefore, it is possible to perform milling without excess or deficiency, and the best polished rice can always be obtained.

Moreover, in this invention, the decision to shift to the bran removal operation is made gradual after a certain period of time has elapsed, so that the transition can be made more easily, so if the milling pressure during milling is not stable depending on the type and condition of the rice grains. Even if it is, the rice will not be over-milled, and it is possible to crush the rice without breaking the rice or reducing the amount of rice.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the control method of this embodiment, FIG. 3 is a flowchart showing the bran removal operation transition process of the control method of this embodiment, and FIG. Figure 4 is a longitudinal sectional view of the rice milling machine of this embodiment, Figure 5 is a perspective view showing the resistor of this embodiment, Figure 6 is a graph showing the relationship between milling pressure and milling time, and Figure 7 is milling load. 3 is a graph showing a pattern of each setting value.

Claims (2)

[Claims] (1) Detect the load current of the main motor that drives the milling roll, compare this current value with a preset value, and adjust the resistor in the pressure chamber so that the milling pressure falls within a certain range. In a rice milling control method for controlling the position,
After controlling the pumping pressure to be within a certain range for a certain period of time, the control of the pumping pressure is released, the resistor is fixed, and pumping is performed, and the pumping pressure is increased to a predetermined number (p) within a predetermined time (m). ,
p≧1), sample the load current value, process this load current value, store the calculated value, repeat this every predetermined time (m), and store this calculated value for the predetermined time (m). m) During a longer predetermined time (M), a bran removal operation transition process is performed to determine whether the value falls within a certain range a predetermined number of times (a) consecutively, and the calculated value is determined to be within a predetermined range. The number of times (a
) If the value falls within a certain range, the rice bran removal operation is started, and if the rice bran removal operation is not started within the predetermined time (M), the rice bran removal operation is performed for each of the predetermined times (m), (M). ), and a predetermined number of times (a), the bran removal operation transition process is performed by setting at least one value smaller than the bran removal operation transition process. (2) Detect the load current of the main motor that drives the milling roll, compare this current value with a preset value, and adjust the resistance of the resistor in the pressure chamber so that the milling pressure falls within a certain range. In a rice milling control method for controlling the position,
After controlling the pumping pressure to be within a certain range for a certain period of time, the control of the pumping pressure is released, the resistor is fixed, and pumping is performed, and the pumping pressure is increased to a predetermined number (p) within a predetermined time (m). ,
p≧1), sample the load current value, process this load current value, store the calculated value, repeat this every predetermined time (m), and store this calculated value for the predetermined time (m). m) During a longer predetermined time (M), a bran removal operation transition process is performed to determine whether the value falls within a certain range a predetermined number of times (a) consecutively, and the calculated value is determined to be within a predetermined range. The number of times (a
) If the value falls within a certain range, the rice bran removal operation is started, and if the rice bran removal operation is not started within the predetermined time (M), the rice bran removal operation is performed for each of the predetermined times (m), (M). ), and a predetermined number of times (a), set at least one value to a smaller value than the bran removal operation transition process, and perform the bran removal operation transition process,
A rice milling control method for a rice milling machine, characterized in that if the transition to the bran removal operation does not occur even after at least two transitions to the bran removal operation are completed, the transition to the bran removal operation is subsequently performed.