JPH11290705A - Polishing net for rice milling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of polishing nets and to prevent the generation of broken rice in the rice polishing work by disposing a region which is made larger in the unit area of the poreless portion of the polishing net on the upstream side of a rice polishing chamber than the unit area on the downstream side of the rice polishing chamber. SOLUTION: The polishing net 5 is arranged with the two polishing nets; the first polishing net 5c on the upstream side of the rice polishing chamber and the second polishing net 5d on the downstream side of the rice polishing chamber in juxtaposition. The polishing net 5 is formed with many bran removing holes 5a... and the width of these bran removing holes 5a... is specified to 0.9 to 1.2 mm. The disposition spacings of the bran removing holes 5a... of the first polishing net 5c is made wider than the disposition spacings of the bran removing holes 5a... of the second polishing net 5d. Only the spacings of the bran removing holes 5a... of the region F of the first polishing net 5c are made wider. Namely, the poreless portion 5e of the unit area is made wider in the upstream side of the rice polishing chamber than the downstream side of the rice polishing chamber. Such region F is disposed, by which are strength of the first polishing net 5c on the upstream side of the rice polishing chamber having a high polishing pressure is increased and the polishing net is made hardly breakable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice mill.

[0002]

2. Description of the Related Art A normal whitening screen has a large number of bran holes having the same width (usually 0.9 mm to 1.2 mm width) formed at the same interval. A technique in which the shape of the hole is specially formed is also disclosed. For example, in Japanese Unexamined Patent Publication No. 3-178344, the width of the bran extraction hole on the grain discharge side is formed larger than the width of the bran extraction hole on the grain supply side, and waste rice other than bran is formed on the grain discharge side. Is also disclosed.

[0003]

In the above-described ordinary fine mesh, when the grain is supplied, the pressure on the grain supply side of the fine mesh is larger than that on the grain discharge side, and particularly when foreign matter enters. However, there was a disadvantage that the white screen was easily broken. On the other hand, if the width of the bran extraction hole is increased to such an extent that the scrap rice can be removed as described in the above-mentioned publication, the sized grains in the milling may enter into the rice bran extraction hole, or may be easily caught and generate broken rice. It is desirable that the width of the bran hole be a normal width. On the other hand, if the width of the bran removing hole is too narrow, the bran removing effect becomes worse.

[0004] It is an object of the present invention to improve the durability of a whitening screen, to prevent the occurrence of broken rice in the whitening operation, and to maintain the efficiency of the rice bran removing action.

[0005]

The above object of the present invention is achieved by the following constitution. In claim 1, raw material grains are fed from a grain supply port, and the raw material grains are refined in a refining room formed by a refining roll and a refining screen comprising a large number of bran holes and non-porous portions. Therefore, in a rice milling device that discharges grain refined from a grain discharge port, an area in which the unit area of the non-porous portion of the polishing net on the upper side of the polishing chamber is larger than the unit area on the lower side of the polishing chamber is provided. The whitening net of the characteristic rice milling device.

According to a second aspect of the present invention, the raw material grains are fed from a grain supply port, and the raw material grains are formed in a refining chamber formed by a refining roll and a refining screen comprising a large number of bran-removed holes and non-porous portions. In a rice milling device that discharges refined grains from the grain discharge port, the arrangement interval of the bran removing holes of the refining mesh on the upper side of the refining room is formed wider than the arrangement interval on the lower side of the refining room. Is provided as a whitening net of a rice milling apparatus.

According to a third aspect of the present invention, there is provided a rice milling machine according to the first or second aspect, wherein the width of the bran hole is formed to be about 0.9 mm to 1.2 mm. .

[0008]

The grain is supplied to the grain supply port, and is conveyed toward the grain discharge port while undergoing the refining action by the refining screen and the refining roll. At this time, the unit area of the non-porous portion of the refining screen on the upper side of the refining chamber is set to be larger than the unit area on the lower side of the refining chamber, so that the strength of the refining screen with a high refining pressure on the upper side of the refining chamber. And the white screen is less likely to be torn, so that the durability of the white screen can be improved. In particular, this is effective when a foreign substance is mixed into the fine mesh and the fine mesh receives a large pressure. The same effect can be obtained by providing a region in which the arrangement interval of the bran removal holes of the refining screen on the upper side of the refining room is wider than the arrangement interval on the lower side of the refining room. In addition, the arrangement of the bran holes is devised, and all the bran holes are made to have a normal width (about 0.9 mm to 1.2 mm), thereby preventing the occurrence of broken rice and the like.
A stable bran removal action becomes possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a rice polishing apparatus will be described with reference to FIG. Reference numeral 1 denotes a brown rice tank, a grain supply port A below the brown rice tank, and a grain feeding spiral 3 for transporting the inputted grains.
And a whitening roll 4 is connected on the same axis from the transport end side of the grain feeding spiral 3. The refining roll 4 is covered with a refining screen 5 having a large number of bran holes 5a to form a refining chamber D, and the refining screen 5 is fixed from the outside by a screen frame 5b. The grain discharge port B is provided with a compression plate 6 for adjusting the polishing pressure in the refining chamber D.

A main shaft 7 penetrates through the grain feeding spiral 3 in the grain conveying direction. And the main shaft 7
Has a rolling roller 4 at one end thereof and a driving pulley 8 at the other end thereof, which is inserted into a transmission pulley 8 through a driving belt 9 from a driving motor 9 of the rice polishing apparatus. 8, 8 and the main shaft 7 are driven to rotate, and the grain feeding spiral 3 and the milling roll 4 are driven to rotate. Also, the main shaft 7
And the inside of the whitening roll 4 are formed in a cavity,
When the other end of the main shaft 7 is communicated with the blower tube 11, the air from the blower fan 12 is provided on the finer roll 4 from the blower tube 11 via the main shaft 7 and the finer roll 4. The bran generated during the whitening operation is guided from the ventilation port 4a to the whitening room D, and the rice bran generated through the whitening operation is passed through the whitening hole 5a of the whitening net.
It is formed to discharge to the outside. Note that the bran discharged from the refining chamber D is sucked by the suction fan 13 and the bran hopper 1
4 through the transfer duct 15 to be discharged outside the machine.

Next, the structure of the fine mesh 5 which is a main part of the present invention will be described. The refining screen 5 is a refining room D as shown in FIG.
Are formed by juxtaposing two refining nets, that is, the first refining net 5c on the upper side and the second refining net 5d on the lower side of the refining chamber D. A large number of bran holes 5a... Are formed in the whitening screen 5, and the width of the bran holes is formed to be about 0.9 mm to 1.2 mm. The portion of the fine mesh 5 other than the bran hole 5a is referred to as a non-porous portion 5e.

The arrangement interval m of the bran holes 5a... In the first white mesh 5c is made wider than the arrangement interval n of the bran extraction holes 5a in the second white mesh 5d. Alternatively, as shown in FIG. 3, only the interval between the bran holes 5a in the region F in the first white mesh 5c may be widened. That is, the non-porous portion 5e in the unit area is configured to be wider on the upper side of the refining chamber than on the lower side of the refining chamber. The region F is not limited to the one shown in FIG.

To explain the operation, the grains fed into the grain supply port A are conveyed by the grain feeding spiral 3 to the upper side of the refining room D of the refining screen 5, and the refining screen 5 and the refining roll 4, ie, While being subjected to the refining action in the refining chamber D, the generated bran is discharged from the bran removing holes 5 a by the blowing action from the blower fan 12 and the suction action of the suction fan 13, and passes through the bran hopper 14 and the transport duct 15. It is discharged outside. Then, the grains are sequentially moved to the lower side of the refining chamber of the refining screen 5 while undergoing the refining action, and are discharged from the grain discharge port B. At that time, the whitening room D
The foreign substances and the like mixed into the mill are cut by the whitening roll 4 and the whitening screen 5c on the upper side of the whitening chamber by the whitening action.
When the size is reduced, the rice is discharged to the bran hopper 14 from the bran removal holes 5a on the lower side of the refining chamber or discharged from the grain discharge port B to the outside of the machine. The bran holes 5a are formed to have a width of about 0.9 mm to 1.2 mm, and the grains are discharged out of the machine without being clogged or caught in the holes.

As described above, the unit area of the non-porous portion 5e of the first refining screen 5c on the upper side of the refining chamber D is larger than the unit area of the non-porous portion 5e of the second refining screen 5d on the lower side of the refining chamber D. By providing an enlarged area, the strength of the first white screen 5c on the upper side of the whitening chamber D where the whitening pressure is high is increased and the first white screen 5c is hardly broken, so that the durability of the white screen 5 can be improved. In particular, this is effective when a foreign substance is mixed in the fine mesh 5 and the first fine mesh 5c receives a large pressure.
Further, the same effect can be obtained by providing a region F in which the arrangement interval of the bran holes 5a of the first refining screen 5c on the upper side of the refining chamber D is wider than the arrangement interval on the lower side of the refining room D. . In addition, the arrangement of the bran holes 5a is devised so that all the bran holes 5a have a normal width (about 0.9 mm to 1.2 mm), thereby preventing the generation of broken rice and the like, and stabilizing them. The rice bran removing action becomes possible.

In this embodiment, two refining screens are arranged in parallel. However, even if one refining screen or three or more refining screens are juxtaposed, the refining room is excellent in view of the entire refining room. Either provide a region in which the unit area of the non-porous part of the polishing net on the side of the polishing chamber is larger than the unit area on the lower side of the polishing chamber, or set the arrangement interval of the holes for removing the bran of the polishing screen on the upper side of the polishing chamber on the lower side of the polishing chamber. It goes without saying that a similar effect is produced even if a region formed wider than the arrangement interval is provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rice polishing apparatus viewed from a side.

FIG. 2 is a side view of a whitening screen.

FIG. 3 is a side view of a whitening screen.

[Explanation of symbols]

3 ... hulling spiral, 4 ... whitening roll, 5 ... whitening net, 5a ...
Bran removal hole, 5b: mesh frame, 5c: first fine mesh, 5d: second
Refining screen, 5e: non-porous part, A: grain supply port, B: grain discharge port, D: refining room

Claims (3)

[Claims] 1. A raw material grain is fed from a grain supply port, and the raw material grain is refined in a refining chamber formed by a refining roll and a refining net comprising a large number of bran holes and non-porous portions. In a rice milling device that discharges grain refined from a grain discharge port, a unit area is provided in which a unit area of a non-porous portion of a milling screen on the upper side of the milling chamber is larger than a unit area on a lower side of the milling chamber. Refining net of rice milling equipment. 2. A raw material grain is fed from a grain supply port, and the raw material grain is refined in a refining room formed by a refining roll and a refining net comprising a large number of bran holes and non-porous portions. In a rice milling device that discharges grain refined from a grain discharge port, it is preferable to provide a region in which the arrangement interval of the bran removing holes of the milling screen on the upper side of the milling chamber is wider than the arrangement interval on the lower side of the milling room. Characterized polishing net of rice milling equipment. 3. The width of said bran hole is from 0.9 mm to 1.
3. The milling net of the rice milling apparatus according to claim 1, wherein the milling net is formed to about 2 mm.