JP2001239172A - Stirring type rice milling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirring type rice milling machine having a hulling function with a low ratio of broken rice. SOLUTION: This stirring type rice milling machine is so constituted as to rotate stirring blades installed in a hopper having small holes in the circumferential wall in a rotatable manner, to rub off the rice bran layer from brown rice in the hopper and simultaneously remove the rice bran through the small holes by the centrifugal force. In such a rice milling machine, the stirring blades are elastically supported with a rotary shaft. In short, the distal end parts from the rotary shaft of the stirring blades are set to be as close as possible to the circumferential wall of the hopper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a stirring rice mill.

[0002]

2. Description of the Related Art Stirred rice mills mill rice by using a conventional milling shaft (milling cylinder) and milling net (milling roll) to remove the bran layer of brown rice (rice without paddy rice). In recent years, it has been widely used mainly as a small household or table-top rice milling machine because it is possible to obtain high-quality rice milling with a simpler device than a rice milling machine of the system (eg, Japanese Utility Model Publication No. 5-36500). . For example, in the conventional machine, a device for forcibly removing the shaved bran by suction or blowing is required, whereas in the stirred rice mill, the bran is removed by centrifugal force, so the device is simple, Further, it is possible to avoid deterioration of rice quality due to frictional heat generated by friction between brown rice and a milled rice shaft, a milled rice net and the like. As shown in FIG. 3, the basic form of the stirring type rice mill has a bran container 2 in a case 1 and a rice mill 3 further inside, a blade member 4 for stirring inside the rice mill 3 and an upper part. A cover member 5 is provided. The side peripheral portion 3a of the milled rice basket 3 is usually formed of a wire mesh having an inner diameter of about 2 to 5 mm such as a square, a rhombus, and a circle, and a rotating shaft 3c is rotated at the center of the bottom through a bearing 3b. A joint 3d which is freely supported and receives a driving force of a motor 6 described below is fixed to a lower portion of the rotating shaft 3c. The blade member 4 includes a rotating blade 4 a and a support member 4.
and a hole formed in the center of the support member 4b is fitted into the rotating shaft 3c and is configured to rotate with the rotation of the rotating shaft 3c. The rotating shaft 3 c rotates at high speed by the driving force of the motor 6 by fitting the joint 3 d to a joint 7 connected to the motor 6 disposed outside the case 1. Therefore, when rice is put in the milling basket 3 and the motor 6 is driven, the rotating blades 4a rotate at high speed, and as a result,
The centrifugal force causes the brown rice to rub against the wire mesh on the side peripheral portion 3a of the milled rice basket 3 to scrape off the germ and the bran layer, while the bran is blown out of the wire mesh and the milled rice remains in the milled rice basket 3.

[0003] As described above, the stirring type rice mill is configured to use a centrifugal force to rub brown rice against a wire mesh to scrape the bran layer and at the same time to blow the bran outward, so that the centrifugal force due to the resistance of the brown rice is reduced. Conventionally, the rotating blades are rigidly formed to avoid the drop. Also, if the distance between the end of the rotating blade (especially the tip) and the peripheral wall of the milled rice basket becomes narrow, the resistance of the brown rice will increase, causing stagnation, stopping the stirring operation and generating a large amount of broken rice. As shown in FIG.

[0004]

The stirring rice milling method has the advantages that the apparatus is simple and easy to handle, and that rice is not exposed to high temperatures, so that high-quality rice can be obtained. Since it was rubbed against the wire mesh by centrifugal force, the generation of broken rice was unavoidable irrespective of the width of the gap between the rotating blades and the peripheral wall of the milled rice basket, and it was difficult to control it. In addition, if the rotation speed (centrifugal force) is reduced to prevent broken rice, the bran layer may not be scraped off, or the scraped bran may remain on the rice surface, impairing the flavor and preservability of the polished rice. Was. As described above, the conventional stirred rice milling machine is liable to generate broken rice, and there is a problem that the tendency is promoted particularly when the condition of brown rice is poor, and it is difficult to adjust the balance between the generation of the broken rice and the milling effect. there were. Furthermore, in the case of the stirring type rice mill, the rice around the hopper is stirred at the same time as the operation by the rotating blades, but there is a time lag until the rice existing in the center of the hopper is stirred and incorporated into the rice polishing process. In addition, there was a problem that the milled rice was uneven and a uniform milled rice could not be obtained. In addition, the conventional agitation type rice mill does not have a function of removing rice, and there is a problem that the rice must be manually removed after the completion of rice polishing, which is one of the factors that hinders application to mass rice polishing. However, with the current threshing technology, it is practically impossible to reduce the rice content in brown rice to zero, and even in first-class rice, the rice content is allowed to be about 0.3%. Therefore, the raw brown rice contains rice irrespective of the difference in grades, and there has been a long-awaited demand for the development of a stirred rice mill having a rice husk removing function. If these problems can be solved, the use of the stirred rice milling machine, which has various advantages such as good flavor of rice by low-temperature treatment and easy maintenance, will be expanded not only for home use but also for business use. Is possible.

[0005] An object of the present invention is to solve the above-mentioned problems, reduce the generation of broken rice regardless of the condition of brown rice, and stir and mill rice that can stably and appropriately remove the bran layer and separate it from the milled rice. To provide machines. It is a further object of the present invention to provide a versatile stirred rice mill capable of removing rice in brown rice and removing rice husk. Another object of the present invention is to provide uniform rice polishing.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention rotates a stirring blade rotatably provided in a hopper having a small hole formed in a peripheral wall, and uses the centrifugal force of the stirring blade in the hopper. This is a stirrer that removes the bran layer from brown rice and simultaneously removes the bran from the small holes. This stirrer is provided with a stirrer that is elastically supported with respect to the rotating shaft. is there. A rice mill according to one embodiment of the present invention is characterized in that a distal end from a rotation axis of a stirring blade is brought as close as possible to a peripheral wall of a hopper.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to FIGS. FIG. 1 shows an example of an agitated rice mill according to the present invention, in which a hopper 12 for accommodating rice in a case 11, a blade member 13 is disposed inside the hopper 12, and a lid member 16 covers the upper side. Peripheral wall 12 of hopper 12
A plurality of slits 12b are bored in at least a part of a. The slit 12b can be provided at any position on the possible peripheral wall of the hopper 12, and can be drilled in the side peripheral wall, the entire possible area of the bottom, or only the appropriate area. The blade member 13 includes the stirring blade 13a and the support 1
As shown in FIG. 2, which is an AA vertical cross-sectional view in FIG. 1, the stirring blade 13a is fixedly connected to the stirring portion 131 distal from the support portion 13b and the connection portion 132 on the support portion 13b side. It is formed by connecting. The stirring unit 131 is formed of a relatively rigid material such as plastic or metal, and is formed in a shape suitable for stirring brown rice. On the other hand, the connecting portion 1
The material 32 is arbitrary in shape and material as long as the stirring portion 131 can be elastically supported, and may be an elastic body as a whole or an elastic body partially using an elastic material. Examples of such an elastic body include springs such as a leaf spring and a flexible plastic preferably having elasticity. Alternatively, the stirring section 131 and the connecting section 132 may be integrally formed of the above-mentioned elastic body. The stirring blade 13a used in the present invention can be manufactured by a method known in the art.

The shape of the stirring section 131 is arbitrary, provided that it is suitable for milled rice. However, if the end is arranged so as to be as close as possible to the peripheral wall 12b, it is effective for paddy removal. In the rice mill of the present invention, as described above, the stirring blade 13a
As a result, the resistance of rice can be partially absorbed when rotated at high speed.
That is, the stirring section 131 of the stirring blade 13a is
Will rotate slightly late at the distal end from
There is no danger that the rice will stay in the gap between the end of the agitating section 131 and the peripheral wall 12a, hinder the rotation and cause the function to stop.
In addition, generation of broken rice caused by the rice being rubbed unnecessarily against the slit 12b by a strong centrifugal force is avoided.
Therefore, even if the distal end of the stirring blade 13a from the support portion 13b is brought as close as possible to the peripheral wall 12a, the rice is not crushed and does not generate broken rice. As a result, as shown in FIGS. 1 and 2, the rice mill according to the present invention has a stirring portion 13 on the peripheral wall 12a.
Even if the tip of 1 is brought as close as possible, no harm is caused by stagnation of rice or broken rice is generated, and the effect of removing rice can be exhibited. The gap between the end of the stirring section 131 and the peripheral wall 12a is preferably substantially the same as or slightly smaller than the short diameter of the rice, and more specifically, will be in the range of about 1.5 mm to 3.0 mm. However, since the dewatering effect depends on the size of the raw rice, the shape of the stirring section 131, the rotation speed, and the like, the gap is not limited to the above numerical value and can be set to an appropriate gap. The gap between the stirring blade 13a and the peripheral wall 12a at the bottom of the hopper 12 is optional as long as the rice does not accumulate and hinder the stirring and does not generate broken rice. In the case of the supported stirring blade 13a, the preferable gap is 5 to 10
mm, more preferably about 8 mm. However, the interval is not limited to the above numerical value, and can be set to an appropriate range according to the shape of the hopper 12, the type of the stirring blade 13a, and the like.

The space between the case 11 and the hopper 12 functions as a bran accommodating portion 14. The bran container 14 can also be a separate container that can be removably fitted between the case 11 and the hopper 12, and the arrangement of such a bran container is known to those skilled in the art (eg, (See FIG. 4).
A motor 15 is installed at the lower part of the case 11, and the tip of the rotating shaft 15 a is supported by a bearing 12 c installed at the center of the bottom of the hopper 12, and the upper part of the hopper 1
2 protrudes into The blade member 1 is attached to the rotating shaft 15a.
The third support portion 13b is formed so as to be detachably fitted, and when the motor 15 is driven, the stirring blade 13a also rotates.

A rotary plate 17 is rotatable between the stirring blade 13a and the bottom of the hopper 12 in synchronization with the stirring blade 13a. The rotating plate 17 is a circular plate made of plastic or the like, and is fixedly provided at the lower end of the support portion 13b. Therefore, the rotating plate 17 acts to fly the rice on its surface, that is, the rice at the center of the bottom of the hopper 2 to the surroundings by centrifugal force at the same time as the rotation of the stirring blade 13a starts.
The size of the rotating plate 17 is such that the radius is one of the inner diameter of the hopper 12.
It is preferred to be about 程度 to ２. As for the position, it is provided as close to the bottom as possible so that rice does not clog between the bottom of the hopper 12 and the rotating plate 17.

The slit 12b of the hopper peripheral wall 12a is
The opening serves not only as a part for removing and removing the bran layer, but also for removing unnecessary bran and chaff, and is not particularly limited as long as the size and shape are suitable for such purpose. However, considering the size of rice grains, the size is
The width is from 0.8 mm to 2.5 mm, preferably from 1.0 mm to 1.0 mm.
The range is 8 mm, more preferably 1.2 mm to 1.5 mm, and the length is 15 mm to 30 mm, preferably 18 mm to 25 mm. In the embodiment shown in FIG. 1, the slit 12 b is formed in the entire side wall 12 a of the side part and the bottom part of the hopper 12, but as described above, the bran layer and the chaff are removed from the brown rice stirred by the stirring part 131. In addition, as long as they can be discharged into the bran accommodating portion 14, it suffices if they are perforated in at least a part of the peripheral wall 12a. For example, by providing an openable and closable opening having a slit 12b formed in a part of the peripheral wall 12a and disposing a removable bran accommodating portion 14 from the outside of the set 11 at the corresponding position, the removal of bran after milling Can be simplified.

At the time of polishing rice, a required amount of rice (containing paddy) is put into the hopper 12, the opening is covered with the cover member 16, and then the motor 15 is driven. The rice is stirred at high speed by 13a. The agitating section 131 of the agitating blade 13a is elastically supported so that it absorbs the drag of the rice while rotating slightly at the end,
Rice is rubbed against the slit 12b in the gap with the peripheral wall 12a. As described above, since the impact force on the rice is appropriately adjusted, the occurrence of broken rice is small irrespective of the quality of the rice, and the bran layer is sufficiently shaved off to remove the paddy. Further, the rice on the rotating plate 17 is blown to the periphery at the same time as the rotation of the stirring blade 13a starts, and is incorporated in the rice polishing process. A slit 12b having a length sufficient for removing the shaved bran layer and the paddy rice paddy.
, And fall into the bran accommodating portion 14. Next, the lid member 16 is removed, the hopper 12 is removed from the case 11, and the milled rice may be taken out.

Test Example 1 Rice was milled using the milling machine of the present invention under the conditions shown in the following table. At the same time, rice is milled by a commercially available rice mill (Comparative Examples 1 to 3), and the results are also shown. The specifications of the rice mill used in the experiment are as follows.

[Table 1]

Each rice mill shown in Table 1 was tested four times under different conditions. The results are shown in Tables 2 to 5 below. In the table below, the dehulling rate indicates the ratio of the number of grains dehulled by inputting 50 grains of rice per 165 g of brown rice. Evaluation of residual chaff is
None (-), slightly present (+), slightly large (++), and large (++).

[Table 2] Example 1

[0015]

[Table 3] Comparative Example 1

[0016]

[Table 4] Comparative Example 2

[0017]

[Table 5] Comparative Example 3

From the above results, in the conventional rice mill, the rate of occurrence of broken rice was all 10 except for one case (B-4 in Comparative Example 1).
%, Or even 20%,
In the case of the rice mill of the present invention, it is clear that the ratio is significantly lower than 10% in all the test examples. In addition, it can be seen that the conventional rice milling machine has almost no milling function and many rice chaffs remain, whereas the rice milling machine of the present invention achieves 100% milling rate.

[0019]

According to the rice mill of the present invention, as a result of elastically supporting the stirring blades, generation of broken rice can be suppressed remarkably, and any kind of brown rice is excellent in quality by a simple operation. Rice can be obtained. In addition, since the stirring blade is elastically supported, an unexpectedly remarkable effect can be achieved in that the rice husk can be crushed almost 100% without breaking rice even when the stirring blade is brought extremely close to the hopper. Furthermore, by providing a rotating plate at the center of the bottom surface of the hopper, the rice in the center can be immediately incorporated into the rice polishing process, so that uniform rice can be obtained. Thus, according to the rice mill of the present invention, the advantages of the stirring type rice mill are kept as they are,
Issues (increase in the rate of broken rice depending on the quality of brown rice,
In addition, it was possible to solve the problem gracefully, and it was possible to improve the quality of milled rice. This opens the way to use not only a home rice mill but also a high-performance agitated rice mill widely for business use. Furthermore, regardless of the quality of brown rice, the rice can be polished properly, which contributes to the effective use of rice.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a stirred rice mill according to the present invention.

FIG. 2 is a plan view of a hopper and a blade member of the stirring rice mill according to the present invention, as viewed from an AA cross section in FIG.

FIG. 3 is a sectional view of a conventional stirring type rice mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Hopper 12a Peripheral wall 12b Slit 12c Bearing 13 Blade member 13a Stirring blade 13b Supporting part 131 Stirring part 132 Connecting part 14 Nuka accommodating part 15 Motor 15a Rotating shaft 17 Rotating plate

Claims (8)

[Claims] An agitating blade rotatably provided in a hopper having a perforation formed in a peripheral wall thereof is rotated so as to scrape a bran layer from brown rice in the hopper by the centrifugal force and simultaneously remove the bran from the small hole. A rice mill, wherein the stirring blade is elastically supported with respect to a rotating shaft. 2. The rice mill according to claim 1, wherein at least a part of the stirring blade is formed of an elastic body. 3. The rice mill according to claim 1, wherein a distal end of the stirring blade from a rotation axis is brought as close as possible to a peripheral wall of the hopper. 4. The rice mill according to claim 3, wherein the distance between the end of the stirring blade and the peripheral wall of the hopper is 1.5 mm to 3.0 mm. 5. The stirring rice mill according to claim 1, wherein the small holes in the peripheral wall of the hopper are slit-shaped. 6. The slit has a width of 0.8 to 1.8 mm and a length of 1.
The rice milling machine according to claim 5, which is 0 to 30 mm. 7. The rice mill according to claim 1, wherein a rotary plate is provided at a position below the stirring blade of the rotary shaft. 8. A stirring blade for a stirring rice mill, at least a part of which is formed of an elastic body.