JPS62225253A - Rice bran wetting type rice-cleaning device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention adds water during milling of rice to moisten the bran layer on the surface of the rice grain and polish it, thereby producing polished rice with a rich surface gloss. This article relates to a rice bran rice polishing device used for rice polishing.

[Conventional technology]

The technique of adding water during rice milling to facilitate the removal of rice bran and improve the surface finish has existed for a long time, and in recent years, various improved techniques have been proposed as follows. For example, in Japanese Patent Publication No. 89-25314, 0.5 to 4%
A technique is shown in which water is added to rice, stirred, and then tempered for 5 to 20 minutes and then milled. In addition, Japanese Patent Publication No. 33-10161 and Special Publication No. 85-1771
The publication discloses a technique for milling by jetting humidified air or water from holes in the wall of a milling roll in a milling room. Furthermore, Japanese Patent Publication No. 39-25312 discloses a technique of adding water at the entrance of a conveying machine that transports rice from a first-stage rice mill to a second-stage rice mill. In addition, special public service 55-25
No. 900 and Japanese Utility Model Publication No. 54-27345 disclose techniques for adding water from the rice feeder or the outer wall of the milling room.

[Problem that the invention seeks to solve]

However, none of the conventional rice milling methods with added water can be said to be practically sufficient, and it is not possible to obtain polished rice with a high gloss and a good surface finish. There are various possible reasons for this, but most of them are due to insufficient consideration of the milling theory regarding water-milled rice. In particular, no consideration is given to the selection of the timing of adding water to the rice grains or the milling effect associated with water addition, and the current situation is that water is simply added in the milling room or grain feeder. However, when water is added at the grain feeding port, the inner wall of the grain feeding port becomes wet with moisture, which hinders the passage of rice, and in some cases makes it impossible for the rice to pass through. Surface gloss is insufficient. Furthermore, when water is added in the whitening room, the rice grains and water are not sufficiently kneaded and the surface gloss is insufficient. As described above, in all conventional methods, it was not possible to obtain the sufficient effect of rice milling with water, and it was not possible to finish polished rice with a high surface gloss as expected.

In view of these points, the present invention has thoroughly researched the theory of water-added rice polishing, and has proposed a water-bran rice polishing device that can add water most effectively and thereby obtain polished rice with an extremely glossy finish. There it is.

Means for Solving Problem C] The technical means of the wet bran rice milling apparatus of the present invention comprises a grain feeding cylinder, a grain feeding wire rotated inside the grain feeding cylinder, and a grain feeding line connected to the grain feeding chamber. It consists of a milling barrel, a blast-friction milling roll rotated inside the milling barrel, a water adding device, and a water supply port of the water adding device opening on the inner circumferential wall of the grain feeding chamber. .

[Effect]

In the wet rice bran milling apparatus of the present invention, water is added from the wall surface of the grain feeding chamber. Further, water is simply water at room temperature that is continuously injected from a water supply port having a needle-shaped hole provided on the wall of the grain feeding chamber. The amount of water supplied is 0.2 to 1 liters per rice amount, 5
Approximately wt% is appropriate, and it is best to adjust and set it as appropriate depending on the type of rice, moisture content, or accuracy of pounding in the first stage. Furthermore, since the grain feeding line rotates at high speed inside the grain feeding chamber, the rice grains in the grain feeding chamber are moving while rolling at high speed and under low pressure. Due to the movement of the rice grains in the grain feeding chamber, almost none of the water injected from the grain feeding chamber wall directly attaches to the rice grains, and most of the water adheres to the inner peripheral wall of the grain feeding chamber. This means that the wall surface of the grain feeding room has the highest water distribution rate in the room.

Further, the rice polishing device of the present invention is for finishing purposes, and a separate rice polishing device is always provided at the front stage. Therefore, the rice grains fed into the grain feeding chamber of the present rice milling device are semi-milled rice that has already been milled to a certain extent.

The appropriate degree of halfway milling is to pound the rice for 5 to 9 minutes. The rice grains sent to the grain feeding room in this way are half-milled and still have residual sugar content, so the water adhering to the inner peripheral wall absorbs the sugar content from the half-milled rice, and This is kneaded by the high-speed transfer of rice grains and becomes a highly viscous clay-like or slimy bran (hereinafter referred to as clay bran). This clay bran forms and adheres to the inner circumferential wall of the grain feeding chamber in a layered manner, and is successively adhered to the surface of rolling rice grains and carried away. Moreover, the clay bran attached to the rice grains is uniformly dispersed on the surface of each rice grain while the rice grains are rolling. In this state, the grain is sent from the grain delivery room to the milling room.

Rice grains with such high-moisture clay bran are further milled using a milling roll in the milling room. This whitening roll is of the blast friction type, and whitening ridges are attached to the surface of the roll, and a blast of air is constantly blown from the roll surface. In this way, the rice grains are polished by friction in the polishing room, and during this process, the moisture in the clay bran penetrates into the bran layer on the surface of the rice grains. Since the rate of penetration is through the clay bran, it is slower than when water is applied directly. In addition, the clay bran on the surface of the rice grain is sticky, so it is difficult to separate from the surface of the rice grain.
There is no rapid progress of bran removal in the semen room.

Therefore, the rice grain removing action that each rice grain undergoes in the milling room is that while the newly generated rice bran from the surface of the rice grain is absorbed into the clay bran,
As milling progresses slowly and this clay bran grows, it gradually becomes detached from the surface of the rice grains in the form of small lumps υ. This separated bran is expelled to the outside through holes in the wall of the whitening chamber. In this way, bran removal progresses slowly in the milling chamber, and the rice grains are gradually sent toward the milling chamber outlet, and the bran on the surface of the rice grains is completely removed before reaching the outlet. Note that in the whitening room, air is blown out from the holes in the whitening roll, and this blast contributes to the removal of the bran and the surface finish of the rice grains. As described above, since the removal of the bran from the rice grains in the milling room proceeds slowly, the surface of the rice grains after the removal of the bran has a very good finish, resulting in extremely glossy polished rice.

〔Example〕

An embodiment of the rice bran polishing apparatus of the present invention will be described with reference to the drawings. (1) is the grain feeding port, from which rice is supplied. However, this rice is not brown rice, but semi-polished rice that has been milled to a certain extent. Therefore, usually a separate rice milling device is connected to the previous stage, and the rice that has been milled in the previous stage is continuously fed to the grain feeder (1
). Rice grains supplied from the grain feeding port (1) enter the grain feeding chamber (2). The outer wall of the grain feeding chamber (2) is formed by a non-perforated grain feeding tube (3). The shape of the grain feeding cylinder (3) may be either a hexagonal cylinder as shown in Fig. 2 or a cylinder as shown in Fig. 3. Inside the grain feeding room (2), the grain feeding line (4) is moving at high speed (1000 to 1400 KP).
M). The feeding line (4) is fixed to a hollow shaft (5), and rotates integrally with the shaft (5) as it is rotated by a drive device (not shown). The rice grains are located in the gap between the grain feeding wire (4) and the grain feeding cylinder (3), and are stirred and rolled as the grain feeding wire (4) rotates, and are also pumped and sent to the milling room. They will be sequentially transferred to

(6) is a water supply device, the water supply port of which is opened in the inner wall of the grain feeding tube (3), through which room temperature water is injected. The appropriate diameter of the water supply port is 0.3 to 1 mm in diameter, and water is simply injected continuously. The amount of water supplied is 0.2 to 1.
Approximately 5m1% is appropriate, and this water supply amount can be adjusted freely. A milling room (7) is formed continuous with the grain feeding room (2). (8) is a milling cylinder, which is integrally continuous with the grain feeding cylinder (3), has a hexagonal cross section, and has many holes in its wall. Reference numeral (9) is a whitening roll, which has whitening ridges attached to its outer wall, is hollow in cross section, and has blowholes formed in the wall surface. Polished raw/L
/ (9) is fixed to the shaft (5) and rotates together with the shaft (5). A blower device aO is installed on the inner surface of the shaft (5).
Air is blown in from the shaft (5), and this air is ejected from the hole in the wall of the shaft (5), and further ejected from the wall of the whitening roll. The rice grains that have entered the whitening room (7) are rolled into whitening rolls (
The grain is subjected to milling and bran removal by the rotation of 9), and is sequentially sent to the grain threshing port αυ. There is a pressure plate (2) in the grain threshing port αυ.
is installed so that it is possible to adjust the grinding pressure inside the whitening chamber (7).

A comparison of milling tests between the present invention and a conventional grain feeder or milling room in which a water adding device is attached is shown below.

Test conditions: Rice used in the test: Nippon Haru Pre-milling accuracy: 65% Rice feeding flow i: 2.8 t/hour Water addition rate: 0.7 Zyt% Rice temperature before milling: 16°C Milling horsepower: 20 ■P In addition, during the test used the same rice milling equipment, but differed only in the location where water was added.

Table 1 Comparative test results In the rice bran milling device of the present invention, water is added in the grain feeding room, so
It is possible to obtain polished rice that has good bran removal performance, a good surface finish of the rice grains, is rich in surface gloss, and has an excellent taste. Since the water supply port is simply formed on the wall of the grain feeding cylinder, the structure is simple and a separate stirring device is not required.

[Brief explanation of drawings]

The drawings show an embodiment of the rice bran milling apparatus of the present invention, in which Fig. 1 is a longitudinal side view, Fig. 2 is a sectional view of the grain feeding section, and Fig. 3 is a sectional view of one using a cylindrical grain feeding cylinder. It is. (1)...grain feeder, (2)...grain feeding room, (3)...
・Grain feeding cylinder, (4)...Grain feeding line, (5)...Shaft, (
6)...Water supply equipment, (7)...Refining room, (8)...
- Refining barrel, (9)... Refining roll, α0... Air blower, αυ... Grain removal port.

Claims (1)

[Claims] 1. A grain feeding tube, a grain feeding spiral rotated inside the grain feeding tube, a milling tube connected to the grain feeding chamber, and a blast friction type whitening roll rotated inside the milling tube, 1. A rice bran polishing device comprising a water adding device, and a water supply port of the water adding device is opened on an inner circumferential wall surface of a grain feeding chamber.