WO2008032887A1

WO2008032887A1 - Rice milling machine

Info

Publication number: WO2008032887A1
Application number: PCT/KR2006/003702
Authority: WO
Inventors: Jae Soon Kim; Sang Jo Sea
Original assignee: Spbiotech Co., Ltd
Priority date: 2006-09-15
Filing date: 2006-09-15
Publication date: 2008-03-20

Abstract

The present invention relates to a rice milling machine that polishes rice by grinding only by a grinding rollers so that the rice would not be bounced onto the bran removing screen, and that the germ of rice to be polished would not be removed. The present invention comprises a milling part (30) which comprises an air inlet (32) and an air outlet (34) having an air outlet fan (38), a bran removing screen (50) which is formed coaxially inside said milling part (30) while keeping regular distance from it, and a grinding roller (60) which is rotated by a motor (62) and formed coaxially in the middle of said bran removing screen (30), the rice milling machine being characterized in that: an air inlet fan (36) is formed in order to draw external air in through said air inlet (32), that it further comprises an air blower part (40) comprising leading-out holes (42a, 42b, 42c) to blow the air drawn in by said air inlet fan (36) from the external circumference of the bran removing screen (50) toward the axis of the grinding roller (60), such that the rice (22) in the bran removing screen does not hit the inner surface of the bran removing screen and the rice is peeled only by the grinding roller (60), thus preventing the rice kernels from losing their germs and from being broken to produce rice of high quality.

Description

Description RICE MILLING MACHINE

Technical Field

[1] The present invention relates to a rice milling machine. More specifically, the present invention relates to a rice milling machine that can polish rice kernels by peeling them by using only a milling roller which is formed at the center without them hitting the inner surface of a bran removing screen, so that the germs are not removed. Background Art

[2] Generally, as illustrated in Figs. 1 and 2, the conventional milling machine is constituted such that an air inlet (4) is formed at the upper part of a cylindrical milling part (2) and an air outlet (12) is formed at the lower part opposite the air inlet (4).

[3] Inside the milling part (2), a bran removing screen (6) is formed fixedly and coaxially so that rice kernels being polished do not get out, and at its center, a grinding milling roller (8), which polishes rice kernels by rubbing them against it after they have been fed, is formed to rotate around a motor (20) axis.

[4] In the conventional milling machine formed as above, as illustrated in Fig. 2, when rice kernels to be polished are fed through a rice inlet part (3), which is formed at the back part of a bran removing screen (6), a grinding milling roller (8) is rotated by a motor (20).

[5] As said grinding milling roller (8) rotates and rubs the fed kernels against the external surface of the grinding milling roller (8), thus polished rice kernels are discharged through the rice outlet (5) which is formed at the front end of the bran removing screen (6).

[6] A certain amount of rice kernels (unpolished rice (22)) fed into a bran removing screen by a grinding milling roller (8) are rubbed against it due to the rotation of the grinding milling roller (8) as illustrated in Fig. 3., and when polished, the rice kernels hitting it as above bounce to, and hit, the inner surface of the bran removing screen (6) strongly.

[7] When the rice kernels are polished by hitting the bran removing screen (6) as above, since the kernels to be polished are very dry and hard, there is a problem of degrading the value of rice as a product because rice grains are broken or the germs are removed.

[8] In addition, according to the prior art, in order to discharge the fine powder produced from the rice kernels being polished by a grinding milling roller (8), an air outlet fan (10) of an air outlet (12) formed at the lower part of a milling part (2) is rotated to pass only the fine powder through the lower part of a bran removing screen (6) and then to the air outlet (12). [9] At that time, as the air outlet fan (10) operates, air flows in from the above through the air inlet into the bran removing screen (6); however, air is discharged much faster than flows in from outside.

[10] Accordingly, since the air is strongly discharged by the air outlet fan (10) formed at the lower part of the milling part (2), the air flows strongly to the lower part of the bran removing screen (6), thus pushing hard the rice being polished in the bran removing screen (6) downward. That is, since the density and pressure of the rice fed to the bran removing screen (6) increase and since the rotating grinding milling roller (8) causes the rice to be abraded against the inner surface of the bran removing screen (6), it causes the problem of the germs of the rice kernels being removed when they are thrown onto the inner surface of the bran removing screen (6) by the centrifugal force produced by the rotation of the roller (8). Further, it can also cause lots of heat from friction when the rice kernels are abraded against each other, or cause the rice kernels to be broken when the rice kernels are thrown onto, and abraded against, the inner surface of the bran removing screen (6).

[11] The temperature of the rice increases due to the impact generated when the rice kernels are thrown onto the inner surface of the bran removing screen or when they are abraded against each other, thus destroying the protein and causing the rice to be dry, which result in the decrease not only in the quality of the rice but also in its value as a commodity because the rice kernels are cracked or broken. Disclosure of Invention

Technical Problem

[12] Accordingly, the present invention is created in order to solve the problems of the prior art as above. Its purpose is to provide a rice milling machine that can polish rice with the germ of the rice kernel remaining intact by removing the bran of the rice kernel by using only a milling roller wherein the rice being polished inside the bran removing screen does not hit the inner surface of the bran removing screen. Technical Solution

[13] In order to achieve the purpose of the invention as discussed above, the rice milling machine of the present invention comprises a milling part which comprises an air inlet comprising an air inlet fan, an air outlet comprising an air outlet fan, a bran removing screen which is formed coaxially inside said milling part while keeping regular distance from the milling part, and a grinding roller which is rotated by a motor and formed coaxially in the middle of said bran removing screen, and the rice milling machine further comprises an air inlet fan that is formed in order to draw external air in through said air inlet, and an air blower part comprising a plurality of air-leading-out holes to direct the air drawn in by said air inlet fan from the external circumference of the bran removing screen (50) toward the axis of the grinding roller.

Advantageous Effects

[14] Because according to the present invention, rice kernels hit, and are abraded against, only the milling roller without hitting the bran removing screen surrounding the roller so that the germs of the rice kernels are not removed, the present invention can upgrade the rice to the highest grade [15] In addition, not only can the milling machine according to the present invention prevent the germs from being removed, but also it can polish rice kernels without breaking them due to crack or impact, thereby resulting in less broken rice kernels and an increased milling rate.

Brief Description of the Drawings

[16] Fig. 1 is a front cross-sectional view of a conventional rice milling machine.

[17] Fig. 2 is a side cross-sectional elevation view of a conventional rice milling machine. [18] Fig. 3 is a view showing a state of polishing rice kernels by a conventional rice milling machine. [19] Fig. 4 is a view showing another state of polishing rice kernels by a conventional rice milling machine. [20] Fig. 5 is a partial sectional perspective view illustrating a rice milling machine according to the present invention. [21] Fig. 6 is a partially exploded oblique view illustrating a rice milling machine of the present invention. [22] Fig. 7 is a schematic view illustrating the flow of air coming in and out the rice milling machine according to the present invention. [23] Fig. 8 is a schematic view illustrating the state of the rice milling machine operating according to the present invention.

[24] -Explanations of reference numerals for major parts of the drawings-

[25] 22: rice 30: milling part

[26] 32: air inlet 34: air outlet

[27] 36: air inlet fan 38: air outlet fan

[28] 40: air blower part

[29] 42a, 42b, 42c...: air leading-out holes

[30] 50: bran removing screen 62: motor

Best Mode for Carrying Out the Invention [31] In reference to the drawings attached hereto, the rice milling machine of the present invention constituted as above will be explained in detail as follows. [32] Fig. 5 is a partial sectional perspective illustrating a rice milling machine according to the present invention. Fig. 6 is a partially exploded oblique view illustrating a rice milling machine of the present invention. Fig. 7 is a schematic view illustrating the flow of air coming in and out the rice milling machine according to the present invention. Fig. 8 is a schematic view illustrating the operating state of the rice milling machine according to the present invention.

[33] According to the present invention, as illustrated in Figs. 5 & 6, the rice milling machine comprises an air inlet (32) at the upper part of the milling part (30), the air inlet (32) comprising an air inlet fan (36), and an air outlet (34) comprising an air outlet fan (38) inside it at the lower end.

[34] A cylindrical bran removing screen (50) is formed coaxially inside the milling part

(30) while keeping regular distance from it.

[35] A grinding roller (60) in the form of a cylinder is provided coaxially in the middle of the bran removing screen (50), the grinding roller comprising a motor (62) that rotates it.

[36] The external circumference of said grinding roller (60) is provided with a grinding surface of diamond.

[37] An air inlet fan (36) is formed above the external surface of the bran removing screen (50) so that external air can be drawn in through an air inlet (32), the bran removing screen being fixed integrally and coaxially inside the milling part (30) while keeping regular distance from it.

[38] An air blower part (40) comprising a plurality of leading-out holes (42a, 42b, 42c ) is formed at the upper part of said milling part (30), so that the air drawn in by the air inlet fan (36) formed inside the air inlet (32) can be blown toward the axis of the grinding roller (30) from the external circumference of the bran removing screen (50).

[39] The leading-out holes (42a, 42b, 42c.) of said air blower part (40) may be formed above the entire external circumference of the bran removing screen (50). However, it is preferable to form them on the entire external circumference of the bran removing screen (50) except for the longitudinal lower part of it.

[40] In addition, the leading-out holes (42a, 42b, 42c.) of said air blower part (40) can be formed in the cylindrical shape, or its end part can take the shape of a trumpet so that the discharged air can be blown onto the bran removing screen (50) as wide as possible.

[41] Referring to the attached drawings, the rice milling machine of the present invention constituted as above will be discussed in detail as follows.

[42] When rice is polished by using a rice milling machine according to the present invention, as illustrated in Fig. 6,rice is continually fed into a bran removing screen (50) of a milling part by using a feeding device or a hopper (not shown).

[43] When the rice to be polished is fed into the bran removing screen (50), which is fixed inside the milling part (3) with the two keeping distance from each other, a motor is operated to rotate the grinding roller (60) installed in the middle of the bran removing screen (50) while the rice contacts the surface of the roller.

[44] The grinding roller (60) rotates with the rice to be polished put in said bran removing screen (50) while the air inlet fan (36) of the air inlet (32) formed at the milling part (30) and the air outlet fan (38) of the air outlet (34) are operated simultaneously to draw in external air and then let the air flow.

[45] Here, external air is drawn into the milling part (30) forcefully by the operation of the air inlet fan (36) formed in the air inlet (32).

[46] The external air drawn in by the air inlet fan (36) is divided into the leading-out holes (42a, 42b, 42c.) through the air blower part (40) formed on the external circumference of the bran removing screen (50).

[47] The air discharged through the leading-out holes (42a, 42b, 42c.) of the air blower part (40) forms a layer of air along the internal circumference of the bran removing screen (50) when the air is blown strongly onto the axis of the grinding roller (60) formed coaxially in the middle of the bran removing screen from the external circumference of the bran removing screen (50) as illustrated in Fig. 7.

[48] As can be seen above, the external air drawn into the bran removing screen (50) through the leading-out holes (42a, 42b, 42c.) of the air blower part (40) is discharged smoothly out of the milling part (30) through the air outlet fan (38) of the air outlet (34) formed at the lower part of the milling part (30).

[49] The pressurized air discharged to the inner center through the external circumference of the bran removing screen (50) by the leading-out holes (42a, 42b, 42c.) of the air blower part (40) as discussed above operates to form an air layer to prevent the rice kernels in the bran removing screen (50) from touching the inner circumference of the bran removing screen (50) by blowing them toward the grinding roller (60) that rotates in the middle of the bran removing screen (50).

[50] The pressurized air discharged through the leading-out holes (42a, 42b, 42c.) of the air blowing part (40) into the bran removing screen is provided continuously through the air inlet fan (36), and thus as illustrated in Fig. 8, rice kernels, which are fed into the bran removing screen (50) and polished while being rotated by the grinding roller (60), are polished by coming into contact with the surface of the grinding roller (60) in a floating state without touching the inner surface of the bran removing screen (50).

[51] Because the grinding roller (60) comprises a diamond grinding surface, the bran of rice can be removed meticulously; because an air layer is formed on the internal circumference of the bran removing screen (50), the rice can avoid hitting the internal circumference and thus its surface layer can be meticulously removed without the germ being removed.

[52] Said grinding roller (60) rotates inside the bran removing screen (50), and the rice kernels are polished while the strong, pressurized air from the leading-out holes (42a, 42b, 42c...), which blows from the external circumference of the bran removing screen (50) toward its inside, keeps them floating inside the bran removing screen (50) and rotating 360 degrees around the grinding roller (60).

[53] Particularly, the leading-out holes (42a, 42b, 42c...), which blows air from the external circumference of the bran removing screen (50), can take a simple cylindrical form; however, as illustrated in A of Fig. 5, it can take the form of a trumpet gradually widening toward the end, so that the air from it comes into contact with a wider area of the surface of the bran removing screen (50) more effectively.

[54] Here, the rice kernels fed into the bran removing screen (50) are not placed along the internal circumference of the bran removing screen (50), but are gathered around the grinding roller (60), and polished while rotating around the grinding roller (60). Because the rotation speed of the grinding roller (60), which is situated in the middle of the bran removing screen (50), is faster that that of the rice kernels revolving around the grinding roller, the rice kernels are polished while they are abraded against the surface of the grinding roller (60) and moved along the bran removing screen (50) and the grinding roller (60) to the rice outlet (38).

[55] In addition, the present invention is characterized in that when rice is polished by the rotation of the grinding roller (60) inside the bran removing screen (50), the rice being polished inside the bran removing screen (50) is polished by the grinding roller (60) without being clumped together because external air is blown toward the axis of the grinding roller (60) through the leading-out holes (42a, 42b, 42c.) from the external circumference of the bran removing screen (50).

[56] As can be seen above, the rice polished by the air blown from the leading-out holes

(42a, 42b, 42c.) is moved toward the external circumference of the grinding roller (60), and because the rice kernels are abraded against the surface of the grinding roller (60) and thus peeled and polished while rotating with the grinding roller (60), the present invention can prevent the germs from being removed, as opposed to the conventional rice milling machine wherein rice kernels are polished when they hit the inner surface of the bran removing screen (50) because of centrifugal force, thus resulting in the removal of their germs; at the same time, the present invention can also prevent rice kernels from being heated by preventing them from being abraded against each other by air pressure.

[57] Particularly, the present invention minimizes the occurrences where the rice kernels, which are polished by being abraded against the surface of the grinding roller (60) installed inside the bran removing screen (50) by the pressurized air emitted from the leading-out holes (42a, 42b, 42c.) of the air blower part (40), hit the bran removing screen (50) because of rotation; thus it minimizes the occurrences where rice kernels are abraded against the inner surface of the bran removing screen (50) and polished while being bumped into each other or clumped together by the rotation of the grinding roller (60) inside the bran removing screen (50).

[58] Rice kernels do not lose their germs and remain intact because the air blown into the bran removing screen (50) by the leading-out holes (42a, 42b, 42c.) of the air blower part (40) prevent them from colliding with each other and being heated at the same time.

[59] In addition, the minute powder from rice kernels that is generated when the rice kernels are being polished by the grinding roller (60) is released through the air outlet (34) of the milling part, the air outlet being located below the lower part of the bran removing screen (50).

[60] At that time, in order to smoothly discharge the minute powder of rice kernels generated by the grinding roller (60), the present invention blows air, firstly, into the bran removing screen (50) through the leading-out holes (42a, 42b, 42c.) of the air blower part (40), and the rice kernels come in touch with the external outer circumference of the grinding roller (60) and are polished while keeping distance from one another, and the air outlet fan (38) strongly rotates so as for the minute powder generated when the rice is polished to flow below the bran removing screen (50) in the longitudinal direction, to let the minute powder out through the air outlet fan (38)

[61] In addition, because the leading-out holes (42a, 42b, 42c.) of the air blower part

(40) are not formed below the longitudinal lower part of the bran removing screen (50), the minute powder of the rice is sucked outside and smoothly discharged through the air outlet (34) by the air outlet fan (38).

[62] As can be seen above, the rice kernels are polished while they are abraded against the surface of the rotating grinding roller (60), because the leading-out holes (42a, 42b, 42c.) of the air blower part (40) blow air from the external circumference of the bran removing screen (50) toward the axis of the grinding roller (60) inside, thus preventing them from being bounced onto the internal circumference of the bran removing screen, or from being abraded against the bran removing screen (50), but allowing them to be polished only by the grinding roller (60); thus the rice milling machine according to the present invention can peel only the outer layers of rice kernels by having them abraded against the surface of the grinding roller (60), without losing their germs.

[63] Particularly, the present invention can prevent rice kernels from being heated by the abrasion of rice kernels against each other, because air blows in all directions toward the inside of the bran removing screen, where the rice kernels are polished, from the leading-out holes (42a, 42b, 42c.) of the air blower part (40), which are formed outside the bran removing screen, thus preventing the germs from coming off because they get too dry while being polished.

Claims

[1] A rice milling machine comprising a milling part (30) which comprises an air inlet (32) and an air outlet (34) comprising an air outlet fan (38), a bran removing screen (50) which is formed coaxially inside said milling part (30) while keeping regular distance from it, and a grinding roller (60) which is rotated by a motor (62) and formed coaxially in the middle of said bran removing screen (50), the rice milling machine being characterized in that: an air inlet fan (36) is formed in order to draw an external air in through said air inlet (32), it further comprises an air blower part (40) comprising a plurality of leading-out holes (42a, 42b, 42c.) which are formed at regular interval above the circumference of said bran removing screen (50) in the longitudinal direction to direct the air drawn in by said air inlet fan (36) from the external circumference of the bran removing screen (50) toward the axis of the grinding roller (60).

[2] The rice milling machine according to claim 1, characterized in that said leading- out holes (42a, 42b, 42c.) of the air blower part (40) are formed above the entire external circumference except the longitudinal lower part of the bran removing screen (50).

[3] The rice milling machine according to claim 1 or claim 2, characterized in that said leading-out holes (42a, 42b, 42c.) of the air blower part (40) take the form of a trumpet gradually widening toward the end, so that the discharged air is distributed wide.