JPH089013B2 - How to operate rice mill - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for operating a rice milling machine for treating brown rice into polished rice.

Conventional Technology A rice milling machine is configured as shown in FIG. A feed roll 2 and a whitening roll 3 are provided inside the whitening chamber 1, and a resistance plate 4 for limiting the cross-sectional area of the passage is provided at the outlet of the whitening chamber 1. In the rice polishing treatment, the whitening roll 3 of the feed roll 2 is rotationally driven by the motor 5, and the brown rice 6 introduced from above is pushed toward the resistance plate 4 by the feed roll 2 to form the net 17 inside the whitening chamber 1. The brown rice is milled in the relationship with the milling roll 3 which is driven to rotate, and the milled milled rice is discharged from the milled rice outlet 7. White rice outlet 7
When the opening degree is decreased, the internal pressure of the polishing chamber 1 increases and the bowling accuracy increases, and when the opening degree increases, the internal pressure decreases and the bowling accuracy decreases.

Conventionally, the white rice outlet 7 is used so that the lapping accuracy can be kept constant.
When the resistance plate 4 is urged by the pressing force of the spring 8 in the direction of closing the rice, and a force exceeding the above urging force acts on the resistance plate 4 from the rice which is being milled, the opening degree of the white rice outlet 7 is increased. Then, the rice mill is operated so as to discharge the white rice having the specified polishing accuracy from the milling chamber 1, and the biasing force of the spring 8 is constant from the start to the end of the milling operation.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional operation method in which the biasing force of the spring 8 is constant from the start to the end of the rice polishing operation in this way, the brown rice 6 sent to the polishing chamber 1 is at the end, and the whitening treatment is performed. When the internal pressure of the polishing chamber 1 drops near the end of the period,
When the desired whitening precision whitening treatment can be performed and the resistance plate 4 is opened and discharged from the white rice outlet 7, the whitening treatment is insufficiently discharged.

It is an object of the present invention to provide an operation method capable of performing a treatment close to the desired polishing accuracy even at the end of the rice polishing treatment.

Means for Solving the Problems The operating method according to claim 1 is to drive a whitening roll arranged in a whitening chamber to rotate so as to whiten brown rice fed into the whitening chamber, and an internal pressure is a white rice flow in the whitening chamber. A rice milling machine configured to discharge from the white rice outlet when the urging force acting on the resistance plate arranged at the position to close the outlet is exceeded and to adjust the urging force to vary the lapping accuracy. When controlling
Detects a specific state where the rate of decrease of the current value flowing in the power source that drives the whitening rolls to rotate at a specified value or more, and when the specific state is reached, the biasing force is made larger than before and the operation is performed. After that, the biasing force is released and the treated brown rice in the polishing chamber is discharged from the white rice outlet.

The operation method according to claim 2, wherein the whitening rolls provided in the whitening chamber are rotationally driven to whiten the brown rice fed into the whitening chamber, and the internal pressure is arranged at a position to close the white rice outlet of the whitening chamber. When the urging force acting on the resistance plate is exceeded, the rice is discharged from the white rice outlet, and when controlling the rice polishing machine configured to adjust the urging force to vary the lapping accuracy,
Detects a specific state in which the reduction rate of the torque acting on the power transmission path that rotationally drives the whitening roll exceeds a specified value, and when the specific state is reached, the urging force is made larger than before. It is characterized in that the biasing force is released after that, and the treated brown rice in the polishing chamber is discharged from the white rice outlet.

Action According to the configuration of each claim, the end value is determined by the current value flowing in the power source that rotationally drives the whitening roll and the torque decrease change rate that acts on the power transmission path, and the biasing force is detected when the end value is detected. The urging force is larger than the required urging force to make it difficult to be discharged from the brewing room, and the rice is finally left in the brewing room even when the internal pressure of the brewing room is low. The processed brown rice in the polishing chamber is discharged from the polished rice outlet by releasing the biasing force.

Example Hereinafter, a specific example of the present invention will be described with reference to FIGS. 1 to 4. It should be noted that components having the same functions as those in FIG.

A rice milling machine for carrying out the operating method of the present invention is configured as shown in FIG.

The feed roll 2 and the whitening roll 3, the pulley 9 and the belt 10
Hollow shaft that is driven to rotate by a motor 5 via
It is attached to 11. A shaft 12 is movably supported inside the shaft 11, and a disc-shaped opening regulating plate 13 is connected to a lower end of the shaft 12 by a pin 15 penetrating an elongated hole 14 formed in the shaft 11. And is installed. Reference numeral 16 denotes an outlet forming member which is arranged at the bottom of the polishing chamber 1 in the vicinity of the opening regulating plate 13 and is formed in an annular shape. Whitening room 1
A net 17 for separating the white rice and the bran is provided around the inner portion of the whitening roll 3. Reference numeral 18 is an actuator for moving the shaft 12 up and down, a female screw 20a that is screwed into the screw shaft 19 is formed in the center, a through hole 20b that engages with the small diameter portion 12a of the shaft 12 is formed in one end, and the other end is formed. A support lever 20 having a guide hole 20c through which a locking shaft 21 for rotation is passed.
, A motor 22 for rotating the screw shaft 19, and a compression spring 23 which is inserted through the small diameter portion 12a of the shaft 12 and is interposed between the upper end of the shaft 12 and the support lever 20. In addition,
Here, the shaft 12 is biased upward by a compression spring 23. In the case of changing the blade accuracy, the motor 22 is operated to change the position of the opening degree regulation plate 13 with respect to the outflow port forming member 16.

A current detector 24 is interposed in the power supply circuit of the motor 5 that drives the whitening roll 3, and the current detection value I _S of the current detector 24 from time to time is supplied to the control unit 25. The control unit 25 repeatedly reads the detected current value I _S at the sampling interval ΔT, calculates the deviation ΔI _S between the latest sampling value and the previous sampling value, and presets the latest deviation ΔI _S at this time. When the condition of ΔI _S ≧ I _R is detected in comparison with the specified value I _R , the brown rice 6 fed into the polishing chamber 1 via the feed roll 2 is lost, and the internal pressure of the polishing chamber 1 is lowered to the end stage. It is determined that the motor 22 is adjusted, and the motor 22 that adjusts the lapping accuracy is controlled.

The control unit 25 controls the operation of the motor 22 and the motor 26 that drives the feeder for feeding the brown rice 6 into the polishing chamber 1 as shown in the flowchart of FIG.

Here, step [a-1] to step [a-5] show the steps immediately after the start of the rice polishing operation, and step [a-5]
-Step [a-8] shows the process of normal rice processing, and step [a-9] -Step [a-13] shows the process of end terminal treatment.

When the control unit 25 detects the operation start instruction in step [a-1], the control unit 25 operates the motor 22 in step [a-2] to maximize the urging force of the compression spring 23. Raise 20. In step [a-3], the motor 26 is operated to put the brown rice 6 into the polishing chamber 1. Whitening room 1
Step a through the stipulation of time when is almost full [a-4]
When it is detected by the above, the control unit 25 stops the motor 26, and then in step [a-5], the motor 5 is operated to rotationally drive the whitening roll 3 to carry out the initial rice polishing. The motor 5 is continuously operated until step [a-13]. Step [a-5]
When the initial rice polishing for the specified time in step 2 is completed, the control unit 25 operates the motor 22 in step [a-6] so that the biasing force by the compression spring 23 becomes the biasing force according to the target rolling accuracy. Move 20. In step [a-7], the motor
26 continuous operation is started and brown rice 6 is continuously introduced into the polishing room 1. In step [a-8], this step [a-
6] to [a-7], the normal rice polishing is carried out.

In step [a-9], the state of (ΔI _S ≧ I _R ),
That is, as shown in FIG. 3, when the shoulder portion 27 of the detected current value I _S generated at the time when the whitening operation is near the end is detected, the control unit 25 operates the motor 22 in step [a-10] and compresses it. The support lever 20 is raised so that the urging force of the spring 23 is maximized, and the remaining amount of rice in the polishing chamber 1 is executed in step [a-11] for a specified time. When the remaining amount of rice is finished, the motor 22 is operated to lower the support lever 20 in step [a-12] to fully open the white rice outlet 7 to discharge the whole amount. In step [a-13], the motor 5 is driven. Stop and stop the operation of the rice milling machine.

In this way, the control unit 25 makes a step [a-
9] to detect it quickly and perform steps [a-10] and [a-11]
And the remaining amount of unpolished brown rice 6 which is no longer pushed by the feed roll 2 is surely milled, and the step [a
-12] can be discharged.

Note that FIG. 4 shows the state of the detected current value I _S at the end of the end when the step [a-10] is executed. As shown in the part 29, the detected current value I _S shows a rising change, and the whitening roll is still seen. It can be estimated from 3 that the remaining amount has been whitened.

In the above embodiment, the deviation ΔI _S between the latest sampling value and the previous sampling value was calculated, and the latest deviation ΔI _S at this time was compared with the preset specified value I _R. The deviation between the average value of the sampling values of and the latest sampling value is calculated, and this is ΔI _S, and this deviation Δ
The control unit 25 can also be configured to detect a specific state by comparing I _S with a specified value I _R.

In the above embodiment, the rate of change of the detected current value of the current detector is judged to automatically detect the final end period by the control unit 25. Instead of the detected current value, the whitening roll 3 is driven as shown in FIG. The torque acting on the power transmission path is detected by the torque sensor.
This is also the case when the control unit 25 is configured to automatically detect the end stage of termination by detecting the reduction rate of the detected torque at 28.

Advantageous Effects of Invention According to the configuration of each claim, the current value flowing in the power source that rotationally drives the whitening roll or the torque acting on the power transmission path is detected, and the reduction rate from time to time of the detected value is equal to or greater than the specified value. When the control unit detects a specific state that has become, when the specific state is reached, the urging force is made larger than before, and then the urging force is released to release the white rice from the white rice outlet. Since the processed brown rice inside is discharged, it is possible to automatically detect the end stage at an early stage and make the remaining amount that could not be whitening processed in the past almost to the target grinding accuracy,
It can be completely whitened from the beginning to the end.

[Brief description of drawings]

1 to 4 show a specific embodiment of a method for operating a rice polishing machine according to the present invention. FIG. 1 is a vertical cross-sectional view of the rice polishing machine, and FIG. 2 is a flow chart of a control unit of the apparatus. FIG. 3 is a waveform diagram of the detected current of the current detector of the apparatus, FIG. 4 is a waveform diagram of the detected current value at the end stage, and FIG. 5 is a schematic configuration diagram of a general rice mill. 1 ... Whitening room, 2 ... Feed roll, 3 ... Whitening roll,
5 ... Motor [power source], 7 ... Rice milling outlet, 18 ... Actuator for adjusting precision of ladle, 24 ... Current detector, 25 ...
… Control unit, I _S …… Detected current value, I _R …… Specified value, 28 …… Torque sensor.

Claims (2)

[Claims] 1. A whitening roll disposed in a whitening chamber is rotatably driven to whiten brown rice fed into the whitening chamber, and an internal pressure is applied to a resistance plate placed at a position to block the white rice outlet of the whitening chamber. When the urging force that is acting is exceeded, it is discharged from the white rice outlet, and when controlling the rice milling machine configured to adjust the urging force and vary the lapping accuracy, a power source that rotationally drives the white polishing roll. Detects a specific state in which the rate of decrease in the current value flowing at times exceeds a specified value, and when the specific state is reached, the urging force is increased to a greater extent than before, and then the urging force is released. Then, the operation method of the rice mill that discharges the treated brown rice in the mill from the white rice outlet. 2. A resistance plate disposed at a position where internal pressure presses white rice rolled into the whitening chamber by rotating a whitening roll disposed in the whitening chamber to whiten the rice, and the internal pressure closes the white rice outlet of the whitening chamber. When the urging force that is acting is exceeded, it is discharged from the white rice outlet, and when controlling the rice milling machine configured to adjust the urging force and vary the lapping accuracy, power transmission for rotationally driving the whitening roll is transmitted. When a specific state where the reduction rate of the torque acting on the path from time to time exceeds a specified value is detected, when the specific state is reached, the urging force is made larger than before, and the operation is performed. A method of operating a rice mill that releases power and discharges the treated brown rice in the mill from the white rice outlet.