JPH07116530A - Automatic adjustment method and device for grain polishing degree - Google Patents

Abstract

PURPOSE:To automatically polish rice grains to a prescribed grain polishing degree by using one unit of measuring instrument regardless of the state of brown rice. CONSTITUTION:The lipid content of the polished rice discharged from a rice milling machine 16 is measured by a near IR spectrochemical analysis apparatus and the pressure in the polishing chamber of the rice milling machine 16 is adjusted by this content. This near IR spectrochemical analysis apparatus and a pressure controller 11 for controlling the pressure in the polishing chamber of the rice milling machine 16 by controlling the degree of compression of the resistance cap disposed in a discharge port 17 of the rice milling machine 16 are connected via a controller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for automatically adjusting the polishing accuracy of brown rice by adjusting the pressure of the polishing chamber of the rice polishing machine according to the lipid content of the polished rice to process the polished rice to a predetermined polishing accuracy.

[0002]

2. Description of the Related Art As a device for adjusting the pressure in the whitening chamber of a rice polishing machine to polish and polish brown rice to a predetermined precision, Japanese Patent Application Laid-Open No. 1-21
There is a rice milling machine with a whiteness measuring device disclosed in JP-A-03050. This rice polishing machine is equipped with a whiteness measuring device that measures whiteness based on the amount of light that passes through the rice grains and the amount of light reflected from the surface of the rice grains. The control device and the whiteness adjusting mechanism of the rice polishing machine are electrically connected so that the value and the whiteness measured by the whiteness measuring device are the same.

With reference to FIG. 6, the operation of the rice milling machine with the above-described polishing degree measuring device will be described.

In the polishing chamber 50, the rice grains that have been subjected to the polishing action by the friction of the rice grains caused by the stirring of the polishing trochanter 51 against the regulating force of the resistance plate 52 are discharged from the rice discharge port 53 to the white rice flow down gutter 54.
Spill to. The rice grains flowing down the white rice falling trough 54 flow into the whiteness measuring device 56 through the sample flow path 55, and the whiteness is measured. Then, the measured whiteness is compared with a preset white rice whiteness setting value, and when the measured whiteness and the set value are different from each other, a control device (not shown) controls the whiteness automatic adjusting mechanism 57. The output signal is delivered to the reversible motor 58, and the automatic whiteness adjusting mechanism 57 is operated,
Automatic control is performed so that the measured whiteness of the whiteness measuring device 56 is the same as the white rice whiteness setting value.

[0005]

However, since the above-mentioned device measures only the degree of whitening after whitening,
If there is a difference in whiteness at the time of brown rice, there is also a difference in the degree of whitening after whitening, and there is a problem that uniform polishing cannot be performed.

Further, when the polishing degree measuring devices are provided on the brown rice supply side and the polished rice discharging side, the above problems are solved, but two polishing degree measuring devices are required, resulting in a very high cost. there were.

Furthermore, when parboiled rice that is steamed and dried in the state of paddy is refined by the above apparatus, the whiteness of the rice grains differs depending on the degree of the parboil, and the unripe rice is entirely black. However, there was a problem in that the accuracy of milling could not be measured accurately, and therefore the product (white rice) had uneven lapping accuracy.

In view of the above problems, the present invention provides a method and an apparatus for automatically adjusting the accuracy of grinding, which can grind rice grains to a predetermined grinding accuracy regardless of the state of brown rice, and has a single measuring device. To do this is a technical issue.

[0009]

In order to solve the above-mentioned problems, the method for automatically adjusting milling accuracy according to the present invention measures the lipid content of white rice discharged from a rice polishing machine, and uses the content to measure the lipid content of the polishing chamber of the rice polishing machine. Characterized by adjusting the pressure,
The measurement of the lipid content is performed by a near infrared spectroscopic analyzer.

Further, the automatic precision adjusting device of the present invention comprises a near-infrared spectroscopic analyzer for measuring the lipid content of white rice discharged from a rice polishing machine, and a resistance lid provided at the white rice discharge port of the rice polishing machine. It is characterized in that the pressure control device for controlling the pressure level of (1) and the pressure control device for adjusting the pressure in the whitening chamber of the rice polishing machine are connected via a control device.

[0011]

[Function] For the white rice discharged from the rice polishing machine, the lipid content is measured by the near-infrared spectroscopic analysis device, and the control device compares the measured value with the preset value input to the control device. When there is a difference between the value and the set value, the pressure control device adjusts the degree of compression of the resistance lid.

[0012]

EXAMPLES The present applicant has already filed an application for a device for measuring the content of a predetermined component of rice grains using a near-infrared spectroscopy analyzer (Japanese Patent Publication No. 1-49890). Therefore, detailed description of the near-infrared spectroscopic analyzer is omitted.

FIG. 2 is a sectional view of the main part of the near infrared spectroscopic analysis apparatus 1. The illustrated near-infrared spectroscopic analysis device 1 is of a reflection type, and its main components are a light source 2, a reflecting mirror 3, a narrow band pass filter 4, an integrating sphere 5, and a detector 6.
a and 6b. Light emitted from the light source 2 and converted into parallel rays through an appropriate optical system (not shown) passes through the narrow band pass filter 4 to become near-infrared light having a specific wavelength, and then has a tilt angle. The near-infrared light entering the integrating sphere 5 through the lighting window 7 provided by opening the upper part of the integrating sphere 5 by the reflecting mirror 3 configured to freely change The sample rice 10 in the sample container 9 of the measuring section 8 provided with an opening at the bottom is irradiated from directly above. Diffuse reflected light from the sample rice 10 reaches a pair of detectors 6a and 6b which are arranged symmetrically with respect to the measuring section 8 and the intensity of the reflected light is measured. In the illustrated embodiment,
In order to correct the optical symmetry and to efficiently receive the reflected light from the sample rice 10, a pair of detectors, that is, reference numeral 6 is used.
Two pieces indicated by a and 6b are provided, but the number is not limited to two and may be one piece or three or more pieces.

Next, the pressure control device will be described with reference to FIGS. 3 and 4.

The pressure control device 11 has, as main components, a resistance lid 14 hung vertically on a horizontal shaft 13 rotatably mounted by a metal fitting 12, and a rice discharging machine 16 is discharged to the horizontal shaft 13 via a metal fitting 15. A weight case 18 provided on the opposite side of the outlet 17 and attached, a screw shaft 21 directly connected to the output shaft 20 of the forward / reverse rotation electric motor 19 provided in the weight case 18, and screwed into the screw shaft 21. It has a weight 22. Screw shaft 2
A guide rod 23 is inserted through the eccentric portion of the weight 22 so that the weight 22 does not rotate with the weight 1.

The control device will be described with reference to FIG.

The control device 24 has a pilot lamp 26, a power switch 27, a white rice lipid content ratio setting device 28, a white rice lipid content ratio display device 29, and a white rice lipid content ratio setting display device 30 on the outside of the measuring device frame 25, respectively. Arranged and measuring device frame 25
An input / output control device 31 is arranged inside. The forward / reverse rotation electric motor 19 of the pressure control device 11 and the near-infrared spectroscopic analysis device 1 are connected to the input / output control device 31.

Next, the operation of the automatic hammering precision adjusting device will be described.

The lipid content of the white rice discharged from the outlet 17 of the rice polishing machine 16 is measured by the near infrared spectroscopic analyzer 1 and is sent to the controller 24 as an output signal. Control device 24
Then, the measured value of the white rice lipid content rate is displayed on the white rice lipid content rate display 29 and the set value displayed on the white rice lipid content rate setting display 30 by the signal from the near infrared spectroscopy analyzer 1. Are compared.

Here, the set value will be described.

The preferred lipid content of the polished rice is 1.3% for the polished brown rice, 0.8% for the polished brown rice, 0.6% for the indica rice and 0.5% for the parboiled rice. And
The set value is a value obtained by adding a correction value depending on the product type to these values. Therefore, if the measured value of the lipid content is the same as the set value, it can be judged that the polishing accuracy of the white rice is good.

When the measured value and the set value are different, the input / output control device 31 of the control device 24 changes the pressure control device 11 from the input / output control device 31.
The output signal is transmitted to the forward / reverse rotation electric motor 19, and the forward / reverse rotation of the forward / reverse rotation electric motor 19 causes the weight 22 to move by rotating the screw shaft 21 so that the measured value and the set value are the same. The pressure level of the resistance lid 14 is adjusted so that

In the above embodiment, the sample rice is fed to the rice polishing machine 1
Although it was white rice discharged from 6, the discharge port 1 of the rice polishing machine 16
The same effect can be obtained by using the bran removed from the rice grains in the vicinity of 7 as a sample.

Further, if the sample rice crushing device and the sample rice supplying device disclosed in Japanese Patent Publication No. 1-49890 are arranged in the preceding step of the near infrared spectroscopic analyzer 1, all the steps can be performed automatically. The lipid content can be measured more accurately by the near-infrared spectroscopic analyzer 1.

[0025]

As described above, according to the present invention, since the adjustment of the accuracy of grinding can be performed by the lipid content of the polished rice, the accuracy of grinding can be adjusted by one measuring device regardless of the state of brown rice. .

Since the lipid content of white rice is measured by a near infrared spectroscopic analyzer, accurate measurement can be performed in a short time.

Further, by connecting the near-infrared spectroscopic analyzer, the control device and the pressure control device, the precision of the grinding can be automatically adjusted by the lipid content of the white rice.

[Brief description of drawings]

FIG. 1 is a flow chart of a method for automatically adjusting the hammering accuracy of the present invention.

FIG. 2 is a cross-sectional view of a main part of a near-infrared spectroscopic analyzer.

FIG. 3 is a side view in which a main part of a rice polishing machine is cut open.

FIG. 4 is a perspective view in which a part of the pressure control device is incised.

FIG. 5 is a diagram showing a control device.

FIG. 6 is a side view of a conventional rice polishing machine with a whiteness measuring device.

[Explanation of symbols]

 1 Near-infrared spectroscopic analyzer 2 Light source 3 Reflector 4 Narrow bandpass filter 5 Integrating sphere 6a Detector 6b Detector 7 Lighting window 8 Measuring part 9 Sample container 10 Sample rice 11 Pressure controller 12 Metal fitting 13 Horizontal axis 14 Resistive lid 15 Metal fittings 16 Rice milling machine 17 Discharge port 18 Weight case 19 Electric motor for forward / reverse rotation 20 Output shaft 21 Screw shaft 22 Weight 23 Guide rod 24 Control device 25 Measuring device frame 26 Pilot lamp 27 Power switch 28 White rice lipid content rate setting device 29 White rice Lipid content rate indicator 30 White rice lipid content rate indicator 31 Input / output control device

Claims (3)

[Claims] 1. A method for automatically adjusting milling accuracy, which comprises measuring the lipid content of white rice discharged from a rice polishing machine and adjusting the pressure in the whitening chamber of the rice polishing machine according to the content. 2. The method for automatically adjusting the polishing accuracy according to claim 1, wherein the lipid content of the white rice is measured by a near infrared spectroscopy analyzer. 3. A near-infrared spectroscopic analyzer for measuring a lipid content of white rice discharged from a rice mill, and a pressure of a resistance lid provided at a white rice discharge port of the rice mill are adjusted to control the rice mill. And a pressure control device for adjusting the pressure in the whitening chamber, which is connected via a control device.