JPH06201550A - Rice grain sample preparation for measurement of optical-characteristics - Google Patents

Abstract

PURPOSE:To prepare a sample in a short time and to prepare rice grain without the difference in density of the sample rice by applying pressure on the rice grain, crushing the rice grain, and solidifying the rice grain. CONSTITUTION:A sample container 8, wherein the adequate amount of rice grain is contained, is coupled into a circular hole 13. When a motor 19 is driven, a spur gear 20 is rotated, and a spur gear 14 and a rotary shaft 15 of a pushing part 3 are also rotated and vertically lowered to the container 8. When a pushing plate 17 comes into contact with a sample, the sample is slowly crushed with the pushing plate 1 without rotation owing to a thrust bearing. When the crushing of the sample advances, the load on the motor 19 becomes large. When the fact is detected with a control device 21, the motor 19 is rotated in the reverse direction. When the spur gear 14 is returned to the initial position A, the motor 19 is stopped. When the crushing of the sample is finished, the container 8 is taken out of the circular hole 13. When, a bottom lid is pushed up, the crushed and solidified rice grain is taken out as the sample rice. The sample rice is provided as the sample piece intactly for a taste measuring device and a polished-degree measuring device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing a sample for measuring optical characteristics of rice grains which is pressed and crushed to be solidified.

[0002]

2. Description of the Related Art As a device for measuring the optical characteristics of rice by irradiating it with a light beam, for example, a taste measuring device for measuring the taste value of rice (Japanese Patent Publication No. 1-49890) or whitening for measuring whiteness of rice. There is a degree measuring device (JP-A-1-142441) and the like.

The taste measuring device has a wavelength range of 1900 to 1900.
Irradiate near-infrared light of 2500 nm to sample rice,
While measuring the components from the absorbance of sample rice, etc., the measured value and the specific coefficient value of the taste judgment divided for each component are calculated and the measured value of the rice taste is displayed. The sample rice to be tested was rice flour which was crushed to 20 to 50 μm by a sample crushing device (Japanese Patent Laid-Open No. 64-12246) or the like and then mixed with stirring.

In addition, the above-mentioned whiteness measuring device measures the reflectance and the transmittance at a ratio of the reflectance and the transmittance which are obtained by irradiating the sample rice with a light beam and the preset reflectance and the transmittance of 100%. Is calculated and the milling degree is calculated from them, but the sample rice used in the apparatus used particles as they were.

[0005]

However, there has been a problem that the crushing of the sample rice and the stirring and mixing of the rice powder by the above-mentioned sample crushing device are troublesome and require a long time.

Further, since the sample rice to be tested by the above-mentioned polishing degree measuring device is a grain, there is a problem that there is a measurement error due to a difference in the density of the sample rice due to a difference in surface condition of particles or a difference in size. was there.

In view of the above problems, the present invention provides a method for preparing a rice grain optical characteristic measurement sample in which a sample is prepared in a short time and the rice grain is prepared so that there is no difference in the density of the sample rice. With the goal.

[0008]

In order to solve the above-mentioned problems, the present invention pressed rice grains, crushed them, solidified them, and used them as sample rice.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred apparatus for carrying out the method of the present invention will be described with reference to the embodiments of FIGS.

Reference numeral 1 denotes a sample crushing device for carrying out the method of the present invention, which is composed of a sample crushing unit 2, a sample pressing unit 3, a drive unit 4 and a control unit 5, and the sample crushing unit 2 will be sequentially described below. To do.

The sample crushing unit 2 is composed of a sample container 8 placed on a support plate 7 provided inside the machine frame 6 and a support base 9 for supporting the support plate 7. The sample container 8 is
The bottom lid 10 is so that the bottom lid 10 can be taken out only upward.
The engagement surface 12 between the 0 and the side wall inner surface 11 is tapered in the same direction (see FIG. 2). Further, the support plate 7 includes
A circular hole 13 for inserting and fixing the sample container 8 is formed.

The sample pressing portion 3 includes a spur gear 14, a rotary shaft 15 fixed to a boss of the spur gear 14, and a thrust bearing 16.
The pressing plate 17 is connected to the lower end of the rotating shaft 15 via the pressing plate 17 (see FIG. 3). The rotating shaft 15 is screwed into a female screw 18 formed on the upper part of the machine frame 6, whereby the pressing portion 3 can move vertically with respect to the sample container 8.

The drive unit 4 is a motor 19 capable of rotating in forward and reverse directions.
And the spur gear 1 fixed to the motor 19 shaft
4 and a spur gear 20 that meshes with it.

The control unit 5 comprises a control device 21 which detects the load applied to the motor 19 and controls the rotation of the motor 19.

Next, a specific operation of the sample crushing apparatus 1 will be described. First, the sample container 8 containing an appropriate amount of rice grains is fitted into the circular hole 13. When the motor 19 is driven, the spur gear 20 rotates, and at the same time, the spur gear 14 and the rotary shaft 15 of the pressing portion 3 rotate and descend vertically to the sample container 8. When the pressing plate 17 comes into contact with the sample, the spur gear 14 and the rotary shaft 15 are driven by the action of the thrust bearing 16.
Rotates, but the pressing plate 17 does not rotate, and the sample is gradually crushed. The load on the motor 19 increases as the sample is crushed. However, when the control device 21 detects a preset load value, the control device 21 causes the motor 19 to rotate in the reverse direction and the spur gear 14 to move to the initial position A. Then, the motor 19 is stopped.

When the crushing of the sample is completed, the sample container 8 is taken out from the circular hole 13 and the bottom lid 10 is pushed up, whereby the crushed and solidified rice grains are taken out as sample rice. Then, this sample rice is directly used for a taste measuring device and a whiteness measuring device.

As described above, the preparation of rice grains by the sample crushing apparatus 1 is carried out in a very short time, and the prepared sample rice is pressed and crushed to be solidified, so that the surface state of the particles is There is no difference in the density of sample rice due to the difference in size or size.

In the sample crushing apparatus 1, the rotation of the motor 19 is controlled by the load,
Using a sensor or the like, when the pressing plate 17 descends to a certain position, the motor 19 rotates in the reverse direction, and when the spur gear 14 returns to the initial position A, the position of the pressing plate 17 is stopped so that the motor 19 stops. It is also possible to control the rotation of the motor 19. Further, as shown in FIG. 4, when the air cylinder 22 or the like is fixed on the upper part of the machine frame 6 to press and crush the rice grains to solidify them, the adjustment time of the rice grains is further shortened.

[0019]

As described above, the preparation of rice grains in the method for preparing a sample for measuring optical characteristics of rice grains of the present invention is
It can be done in a very short time, and the prepared sample rice is pressed and crushed to be solidified, and there is no difference in the density of the sample rice due to the difference in the surface condition of the particles or the difference in size. There is no measurement error when measuring the optical characteristics of the.

[Brief description of drawings]

FIG. 1 is a front view of a sample crushing apparatus for carrying out the method of the present invention.

FIG. 2 is a configuration diagram of a sample container.

FIG. 3 is a configuration diagram of a lower end portion of a rotary shaft.

FIG. 4 is a front view of a sample crushing apparatus using an air cylinder for carrying out the method of the present invention.

[Explanation of reference numerals] 1 sample crushing device 2 sample crushing unit 3 sample pressing unit 4 drive unit 5 control unit 6 machine frame 7 support plate 8 sample container 9 support base 10 bottom lid 11 side wall inner surface 12 engagement surface 13 circular hole 14 flat Gear 15 Rotating shaft 16 Thrust bearing 17 Pressing plate 18 Female screw 19 Motor 20 Spur gear 21 Controller 22 Air cylinder

Claims (1)

[Claims] 1. A sample for measuring optical characteristics of rice grains, characterized in that, when the optical characteristics of rice are measured by irradiating the rice with light rays, the sample rice is pressed and crushed to be solidified. Preparation method of.