JPH089012B2 - Rice milling machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to 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 milling treatment, the feed roll 2 and the whitening roll 3 are rotationally driven by the motor 5, and the brown rice 6 introduced from the upper part 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 with the milling roll 3 which is driven to rotate, and the milled white rice is discharged from the white 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 polished rice having a prescribed polishing accuracy is discharged from the polishing chamber 1.

In such a general rice milling machine, when it is detected that the current value flowing through the motor 5 has dropped below the set current value, it is automatically determined that the whitening of the brown rice continuously fed to the whitening chamber 1 is completed. It is conceivable to configure so as to make a judgment.

However, when the end time is automatically determined by comparing the current value flowing through the motor 5 with the set current value, the set current value is changed each time according to the accuracy of the hammering. It is necessary. This is because when the biasing force of the resistance plate 4 by the spring 8 is increased in order to increase the accuracy, the internal pressure of the whitening chamber 1 rises and the load current of the motor 5 rises.
When the urging force is reduced, the internal pressure of the polishing chamber 1 is reduced and the load current of the motor 5 is reduced.

It is an object of the present invention to provide a rice milling machine that can automatically detect the end time accurately regardless of the accuracy of grinding without changing the set value or the like.

Means for Solving the Problems The rice polishing machine according to claim 1 rotationally drives a whitening roll arranged in a whitening chamber to whiten brown rice fed into the whitening chamber and discharges it from a white rice outlet of the whitening chamber. Then, the opening degree of the white rice outlet is adjusted to change the lapping accuracy, and a current detector that detects the current value flowing to the power source that rotationally drives the whitening roll is provided. Is provided to detect a specific state in which the reduction rate of the current value from time to time exceeds a specified value.

The rice polishing machine according to claim 2, wherein the whitening roll disposed in the whitening chamber is rotationally driven to whiten the brown rice fed into the whitening chamber and discharge it from the white rice outlet of the whitening chamber to open the white rice outlet. The torque sensor that detects the torque that acts on the power transmission path that rotationally drives the whitening roll is installed, and the torque detected by the torque sensor is read to reduce the torque value from time to time. It is characterized in that a control unit for detecting a specific state in which the rate is equal to or higher than a specified value is provided.

Action According to the configuration of each claim, the magnitude of the current value flowing to the power source that rotationally drives the whitening roll and the magnitude of the torque acting on the power transmission path greatly change according to the drilling accuracy. Attention is paid to the fact that the rate of decrease in the current value and torque is almost constant regardless of the accuracy of the stroke, and the control section presets the rate of decrease in the detected value of the current detector or torque sensor and the preset value. It is automatically compared with the value when the reduction rate reaches or exceeds the specified value.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. It should be noted that components having the same functions as those in FIG.

The rice milling machine of the present invention is constructed 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 hammering accuracy, the motor 22 is operated to change the position of the opening degree regulation plate 13 attached 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. The lamp 26 is turned on when the state of ΔI _S ≧ I _R is detected as compared with the specified value I _R.

With this configuration, even when the set lapping accuracy is changed and the detected current value I _S fluctuates significantly, the detected current generated when the whitening operation is near the end as shown in FIG. The shoulder 27 having the value I _S can be reliably detected to realize automatic detection of the end time.

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 control unit 25 detects the state of (ΔI _S ≧ I _R ) and turns on the lamp 26, but the control unit 25 controls the operation of the motor 22 to control the whitening operation at the end time. It can also be configured as follows.

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. Since the control unit detects the specific state where
It is possible to automatically and extremely accurately detect the end-of-end specific state without a troublesome operation such as changing the set value each time according to the running accuracy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a rice polishing machine of the present invention, FIG. 2 is a current waveform diagram of a current detector of the same apparatus, and FIG. 3 is a schematic configuration diagram of a general rice polishing machine. 1 ... Whitening room, 2 ... Feed roll, 3 ... Whitening roll,
5: Motor [power source], 7: Rice milling outlet, 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 rotationally driven to whiten brown rice fed into the whitening chamber and discharged from a white rice outlet of the whitening chamber to adjust the opening degree of the white rice outlet. In addition to being configured to vary the accuracy of the grinding, a current detector that detects the value of the current that flows in the power source that rotates and drives the whitening roll is provided.The current detection value of the current detector is read and the reduction rate of the current value from time to time is specified. A rice polishing machine equipped with a control unit that detects a specific state that has exceeded the value. 2. The whitening roll provided in the whitening chamber is rotationally driven to whiten the brown rice fed into the whitening chamber and discharge it from the white rice outlet of the whitening chamber to adjust the opening of the white rice outlet. A torque sensor that detects the torque acting on the power transmission path that rotationally drives the whitening roll is provided, and the detection rate of the torque sensor is read and the reduction rate of the torque value from time to time exceeds the specified value. Rice mill equipped with a control unit that detects a specific state when