JP2007289857A - Rice milling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice milling apparatus capable of uniformly shaving the whole surface of an unpolished rice by thinly and widely stripping the surface of a grain by an inexpensive constitution. <P>SOLUTION: A large number of line-like groove parts (d), (e) parallel to a drive shaft (1) are formed on an outer peripheral surface of a cylindrical milling roll (2) rotated/driven by the drive shaft (1) with every set clearance. Thereby, since the surfaces of the unpolished rices filling milling chambers m, n are successively abutted on the rotating groove parts, rice bran layers on the surfaces of the unpolished rices can be stripped off. While it is an apparatus which can finish it to the milled rice with a sufficient finishing, it can be made to the inexpensive rice milling apparatus with a simple constitution because machining of the milling roll is only performed by forming the linear groove. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rice milling apparatus for whitening brown rice.

Patent Document 1 describes a technique for polishing rice by peeling off the surface of the grain thinly and widely.
Japanese Patent Publication No. 5-12987

  In the technique of Patent Document 1, as described in the publication, it is a whitening treatment technique different from the so-called friction-type rice milling apparatus and grinding type, and by polishing the surface of the grain so as to be peeled thinly and widely, There is an advantage that the entire surface of the grain can be cut evenly, but since a large number of ceramic blades are attached to the whitening roll and formed, the processing is difficult and expensive. An object of the present invention is to provide a rice milling apparatus that can cut the entire surface of a grain without any unevenness by peeling off the surface of the grain thinly and widely with an inexpensive configuration.

In order to solve the above problems, the present invention has taken the following technical means.
That is, the invention according to claim 1 is a linear groove portion (d) (e) parallel to the drive shaft (1) on the outer peripheral surface of the cylindrical whitening roll (2) rotated and driven by the drive shaft (1). ) Is formed at a set interval.

  According to the second aspect of the present invention, a whitening outer cylinder (14) is provided on the outer peripheral side of the whitening roll (2), and the inner peripheral surface of the whitening outer cylinder (14) is parallel to the drive shaft (1). 2. The rice milling apparatus according to claim 1, wherein a large number of line-shaped grooves (x) are formed at set intervals.

  The invention according to claim 3 is characterized in that the whitening roll (2) comprises a first whitening roll (2a) and a second whitening roll (2b), and the outer peripheral surface of the first whitening roll (2a) for whitening brown rice. Deeper than the line-shaped groove (e) formed on the outer peripheral surface of the second whitening roll (2b) for whitening the polished rice obtained by whitening the line-shaped groove (d) formed in the first whitening roll (2) The rice milling apparatus according to claim 1, wherein the rice milling apparatus is formed.

  According to the first aspect of the present invention, the line-shaped groove portions (d) and (e) that are formed at every set interval come in contact with the surface of the brown rice one after another, so that the rice bran layer on the surface of the brown rice can be scraped off without unevenness. Moreover, since it is only necessary to form a line-shaped groove on the milling roll (2), a rice milling apparatus having an inexpensive configuration can be obtained.

  According to the second aspect of the present invention, by forming the line-shaped groove portions (d), (e), and (x) on both the whitening roll (2) and the whitening outer cylinder (14), both the inner side and the outer side are formed. The rice bran layer on the surface of the brown rice can be peeled off, so rice milling efficiency is good.

  The invention according to claim 3 peels off most of the rice bran layer on the surface of the brown rice with the first whitening roll (2a) and peels off the rice bran layer left with the first whitening roll (2a) with the second whitening roll (2b). Since it can be taken, the finish of polished rice can be improved.

As the best mode for carrying out the invention, a rice milling apparatus that finishes brown rice to wash-free rice will be described.
A whitening roll 2, a conveying spiral 3, and a polishing roll 4 are appropriately attached along the vertical direction on the drive shaft 1 of the vertical axis, and these are configured to rotate with the rotation of the drive shaft 1. A hollow outer cylinder 5 is provided at a fixed position on the outside of the whitening roll 2, the conveying spiral 3, and the polishing roll 4.

  The transport spiral 3 includes a first transport spiral 3a and a second transport spiral 3b, and the whitening roll 2 includes a first whitening roll 2a and a second whitening roll 2b. From the top, the first transporting spiral 3a and the first whitening roll 2a are provided. The conveying spiral 3 and the whitening roll 2 are alternately arranged in the vertical direction in the order of the second conveying spiral 3b and the second whitening roll 2b.

  The drive shaft 1 includes a conical dispersion 11 that disperses brown rice supplied from the supply hopper 6 in the periphery, a first conveyance spiral 3a that conveys the brown rice dispersed by the dispersion 11 downward, and a first conveyance spiral 3a. The first milling roll 2a that mills the surface of the brown rice that has been transported, the second transporting spiral 3b that transports the milled rice that has been milled by the first milling roll 2a downward, and the milled rice that has been transported by the second transporting spiral 3b. Further, a second whitening roll 2b for whitening, a polishing roll 4 for polishing the whitened rice polished by the second whitening roll 2b, and a discharge roll 7 for discharging the whitened rice polished by the polishing roll 4 are attached.

  The whitening roll 2 of the present embodiment is made of metal (for example, stainless steel), and the polishing roll 4 is made of a plurality of stages of foamed resin. The discharge roll 7 is also made of a plurality of stages of foamed resin, but may be a normal wing as long as it can discharge polished rice.

On the outer peripheral surfaces of the first whitening roll 2a and the second whitening roll 2b, a large number of line-shaped grooves d and e are formed at set intervals in the direction parallel to the drive shaft 1, respectively.
Groove parts d and e are formed with depths d1 and e1 shallower than the thickness of rice (about 2 mm) (about 0.4 to 0.5 mm), and widths d2 and e2 are the major axis of rice (about 7 mm). It is formed wider (about 10 mm).

Further, the depth e1 of the groove part e of the second whitening roll 2b is 0.4 mm, and the depth d1 of the groove part d of the first whitening roll 2a is shallower than 0.5 mm.
Moreover, the inside of the 1st whitening chamber m and the 2nd whitening chamber o which are mentioned later by adjusting the flow volume of the whitening rice which passes along an outer peripheral part in the lower end part of each of the 1st whitening roll 2a and the 2nd whitening roll 2b. Adjusting protrusions g and h for adjusting the pressure of each are provided.

  The outer cylinder 5 is provided with a supply hopper 6 on one side thereof and an upper outer cylinder 5a covering the periphery of the dispersion 11 and the first conveying spiral 3a, and a suction passage 29 and a compressed air discharge passage 27 described later. A middle outer cylinder 5b that covers the periphery of the whitening roll 2a, the second whitening roll 2b, and the polishing roll 4, and a lower outer cylinder 5c that covers the periphery of the discharge roll 7 provided with the compressed air supply passage 26 and the compressed air discharge passage 27 described later. And consists of The upper outer cylindrical body 5a, the middle outer cylindrical body 5b, and the lower outer cylindrical body 5c each have a flange portion f and are configured to be detachable with bolts or the like.

  A whitening outer cylinder that covers the periphery of the first whitening roll 2a with a set interval inside the middle outer cylinder 5b and that has a large number of line-shaped grooves x in parallel with the drive shaft 1 on its inner circumferential surface. There are provided a body 14 and a stripping wire mesh 15 that forms a large number of punching holes (not shown) below the polished white outer cylinder 14. Flange portions 14b and 15b are formed at the upper and lower ends of the polished white cylinder 14 and the stripping metal mesh 15, respectively. The upper flange portion 14b of the polished white cylindrical body 14 is a flange portion of the upper cylindrical body 5a and the middle cylindrical body 5b. The lower flange portion 14b of the whitening outer cylinder 14 is detachably connected to the upper flange portion 15b of the stripping wire mesh 15, and the lower flange portion 15b of the stripping wire mesh 15 is The middle outer cylinder 5b and the flange f of the lower outer cylinder are detachably connected. All the connections are connected by bolts.

  In the present embodiment, the space between the first whitening roll 2a and the whitening outer cylinder 14 is the first whitening chamber m, and the space between the second conveying spiral 2b and the whitening outer cylinder 14 is the second conveyance. The space between the chamber n, the second milling roll 2b and the milling outer cylinder 14 or the stripping metal mesh 15 is the second milling chamber o, and the space between the polishing roll 4 and the stripping metal mesh 15 is the polishing chamber p. A space between the roll 7 and the dust net 16 is defined as a dust chamber q, and brown rice or milled rice passes through each chamber.

Inside the lower outer cylinder 5c, there are provided a dust metal mesh 16 for forming a large number of dust exhaust holes (not shown) and a discharge passage 17 for discharging the polished rice to the outside of the outer cylinder 5.
As shown in FIG. 4, the drive shaft 1 is divided into an upper drive shaft 1a and a lower drive shaft 1b on the same axis, and is connected via a bearing portion 1c. In the present embodiment, the first conveying spiral 3a, the first whitening roll 2a, and the second conveying spiral 3b are configured to rotate by the upper drive shaft 1a, and the second whitening roll 2b, the polishing roll 4, and the discharge roll 7 are below. The drive shaft 1b is rotationally driven.

  The upper drive shaft 1a is driven by the upper drive shaft drive motor 20, the lower drive shaft 1b is driven by the lower drive shaft drive motor 21, and the upper drive shaft drive motor 20 is a variable speed motor capable of controlling the rotation speed. The rotation control is possible with an inverter (not shown).

  Reference numeral 25 denotes a compressed air fan, and the wind from the compressed air fan 25 flows into the dust discharge space r inside the lower outer cylindrical body 5c from the compressed air supply passage 26, and passes through the compressed air discharge passage 27 from the dust discharge space r to the outside of the central part. It is the structure supplied to the soot discharge space s of the cylinder 5b. Reference numeral 28 denotes a suction fan which is configured to attach the suction passage 29 to the middle outer cylinder. 30 is a cyclone and 31 is a soot container.

Next, the process until brown rice is washed is described.
When brown rice is supplied to the supply hopper 6, the brown rice is supplied into the upper outer cylinder 5a, hits the dispersion 11 and is dispersed throughout the upper outer cylinder 5a, and is transferred to the lower first milling chamber m by the first transfer helix 3a. Is done. And the side wall part d3 of the groove part d of the 1st whitening roll 2a acts on the surface of brown rice continuously, and peels the rice bran layer on the surface of brown rice. Moreover, the surface of the brown rice surface acts on the side surface x1 of the groove portion x of the inner peripheral surface of the whitening outer cylinder 14 provided on the outer peripheral side of the first whitening roll 2a and acts on the surface of the brown rice flowing by the rotation of the first whitening roll 2a. Peel off the layers.

The polished rice that has been subjected to the whitening treatment in the first whitening chamber m is conveyed to the second whitening chamber o by the second conveying spiral 3b and peels off the straw layer remaining on the surface of the polished rice again by the second whitening roll 2b.
The polished rice that has been polished in the second polishing chamber o flows into the polishing chamber p, is polished to a non-washed surface, and the dust roll and dust are slightly removed by the action of the discharge roll 7. Then, it is discharged from the dust chamber q through the discharge passage 17 to the outside of the machine.

  Dust and dust generated in the dust removal chamber q due to the action of the discharge roll 7 on the polished rice pass through a dust removal hole (not shown) of the dust metal mesh 16 by the pressure wind action of the pressure wind fan 25, The dust flows out from the dust exhaust space r into the middle outer cylindrical body 5b through the compressed air discharge passage 27. Further, the soot generated in the finishing process of the first whitening roll 2a and the second whitening roll 2b passes through the punching hole (not shown) of the stripping wire net 15 by the suction action of the suction fan 28 and enters the soot discharge space s. It flows in and is stored in the soot storage container 31 through the suction passage 29 and the cyclone 30 together with soot and dust that flows into the soot discharge space s from the compressed air discharge passage 27. FIG. 5 shows a process chart in which dust and soot generated in the whitening process and the polishing process are conveyed to the soot container.

Next, a process of making polished rice having a lower degree of whitening than unwashed rice will be described.
The rotational speed of the upper drive shaft 1a is changed according to the set milling degree. In the present embodiment, the milling degree of the fifth and eighth minutes, the standard and the non-washed rice can be set in the order of the lowering of the milling degree. The upper drive shaft 1a increases the rotational speed as the milling degree increases, thereby increasing the force to peel off the cocoon layer of the first milling roll 2a and increasing the supply amount of milled rice to be milled, thereby increasing the first milling chamber m and In this configuration, the degree of whitening can be increased by increasing the whitening pressure in the second whitening chamber o.

On the other hand, the rotational speed of the lower drive shaft 1b is fixed to stabilize the polishing action of the polishing roll 4.
The effects of this embodiment will be described below.

  By forming a large number of line-shaped grooves d and e parallel to the drive shaft 1 on the outer peripheral surface of the cylindrical whitening roll 2 at set intervals, the side surfaces of the grooves are successively applied to the brown rice filled in the whitening chambers m and n. Since d3 and e3 come into contact with the surface of brown rice or polished rice, the straw layer on the surface of brown rice or polished rice can be peeled off. Therefore, while it is possible to finish the milled rice with a good finish, since the milling roll only forms a line-shaped groove, the milling roll can be made with a simple structure and at a low cost. Further, the grooves d and e are formed such that the depths d1 and e1 are shallower than the thickness of rice (about 2 mm) (about 0.4 to 0.5 mm), and the widths d2 and e2 are set to the major axis of rice (about 7 mm). It is possible to prevent the rice from entering the groove portions d and e and being clogged.

  In addition, since the outer surface of the brown rice is peeled off from both the inside and the outside by providing the whitened outer cylindrical body 14 in which the line-shaped groove part x similar to the whitening roll 2 is provided on the outer periphery of the whitening roll 2, more The straw layer on the surface of brown rice or milled rice can be peeled off over a wide range, and the milling efficiency can be improved. Further, the efficiency of the whitening process is improved, so that the whitening load can be reduced, the increase in the grain temperature during the whitening process can be reduced, and the power consumption can be reduced. Conventionally, it is difficult to apply a milling load and incomplete milled rice is likely to be generated, and even at the beginning of milling or at the end of milling, a stable milling load is applied, so that the milled rice can be finished in a good milling state.

  Further, by forming the depth e1 of the groove part e of the second whitening roll 2b to be shallower than the depth d1 of the groove part d of the first whitening roll 2a, the first whitening roll 2a roughly peels off the surface wrinkle layer. Since the remaining thinned rice bran layer of the polished rice can be peeled off with the second polished roll 2b, the finished polished rice can be finished with good finish. In addition, the load of the variable speed motor that changes the rotation speed of the first whitening roll 2a can be reduced by separately driving the first whitening roll 2a and the second whitening roll 2b that are particularly loaded. Accordingly, an inverter with a small output can be obtained, and an inexpensive rice milling apparatus can be obtained.

  In addition, even when processing to a degree of whitening lower than that of non-washed rice, the surface can be smoothed by the polishing roll 4 after the whitening process is performed with the whitening degree set by the whitening roll 2, so that the degree of whitening is low. Even when finishing, it can be made into polished rice with good appearance.

  Since dust and soot generated in the dust chamber q and soot generated in the first whitening chamber m and the second whitening chamber o can be transported to the soot container 31 through a common transport path, costs can be reduced. .

  The rice milling apparatus of the present embodiment can supply brown rice and finish it to wash-free rice, but the drive shaft 1 supported by the base 40 is configured to penetrate each part device for whitening treatment and installed. Because the area is small, the building is equipped with a stone removal device, a cocoon processing unit, and various transport devices. In a possible toll-type rice milling facility, it can be made into a compact building rice milling facility.

Diagram explaining the inside of a rice milling machine Perspective view showing the whitening roll, conveying spiral, and polishing roll attached to the drive shaft Sectional view seen from the plane of the first whitening roll and the whitening outer cylinder 14 The figure explaining the drive composition of a rice milling device Dust / Dust Discharge Process Diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Whitening roll 2a First whitening roll 14 Whitening outer cylinder d Groove part e Groove part x Groove part

Claims (3)

  A large number of line-shaped grooves (d) (e) parallel to the drive shaft (1) are formed at set intervals on the outer peripheral surface of a cylindrical whitening roll (2) that is rotationally driven by the drive shaft (1). Rice milling device characterized by   A whitening outer cylinder (14) is provided on the outer peripheral side of the whitening roll (2), and a linear groove (x) parallel to the drive shaft (1) is set on the inner peripheral surface of the whitening outer cylinder (14). 2. The rice milling apparatus according to claim 1, wherein a large number are formed at intervals.   The milling roll (2) is composed of a first milling roll (2a) and a second milling roll (2b), and a line-shaped groove (d) formed on the outer peripheral surface of the first milling roll (2a) that mills brown rice. A deep groove is formed deeper than the line-shaped groove (e) formed on the outer peripheral surface of the second milling roll (2b) for milling the milled rice that has been milled with the first milling roll (2). The described rice milling apparatus.

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