JP2018183732A - Grinding roll for rice milling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grinding roll for rice milling which is lightweight and has high rigidity and can prevent a rise of a temperature in rice grains.SOLUTION: A grinding roll 18 for rice milling of a vertical grinding type milling machine includes a cylindrical body 29 formed of metal and other base material, and abrasive grains 30 fixedly attached to the surface. A cylindrical wall 31 of the cylindrical body 29 is a hollow body having an outer wall 32 and an inner wall 33. A hollow part 34 is vacuum, is filled with inert gas, or is filled with a honeycomb structure 38 and a foamed resin 39 to thereby be reinforced, in some cases.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a grinding roll for milling rice used when milling brewed rice.

  Conventionally, a circulation type hard grinding type rice milling machine is often used for the milling of brewed rice that performs extreme grinding (such as 45% yield) (Patent Document 1). In this type of rice brewing machine for brewing, grinding rolls for rice milling arranged in a bowl are arranged in a milling cylinder, and a milling chamber is provided between the outer peripheral surface of the milling roll for rice milling and the inner peripheral surface of the milling cylinder. Then, rice grains are repeatedly supplied to the whitening chamber, and whitening is performed by grinding.

A grinding roll for milling rice is usually formed into a cylindrical body by molding and sintering gold hard sand (silicon carbide) together with a binder (referred to as a gold hard sand roll). Since the sintered body is brittle without a certain wall thickness, the gold and sand roll has a thick cross section and a large weight (50 to 70 kg) as shown in Patent Document 1.
In addition, the gold-and-sand sand roll as the whitening roll is fixed in an integrally formed form in which several annular protrusions are provided in the heel direction on the surface side of the cylindrical wall constituting the cylindrical body.

In the rice brewing machine for brewing in Patent Document 2, it has been proposed to reduce the weight of the milling roll by configuring the side part of the milling roll with a thin metal cylindrical body. This whitening roll is a conventional metal-hard sand roll having an annular convex portion, and a cylindrical body is formed of a thin metal (metal thin plate) having a uniform thickness of 3 to 15 mm.
Note that the rice brewing machine for brewing in Patent Document 2 employs diamond abrasive grains to improve grinding efficiency, and is fixed to the surface of the thin cylindrical body. The adoption of diamond abrasive grains increases the grinding efficiency, and even if the whitening roll is downsized, the required grinding efficiency can be ensured, and the weight of the whitening roll can be further reduced.

JP-A-4-11958 Japanese Patent No. 5897301

The present gold and sand roll is completed as a grinding roll for rice milling both in terms of form and material, but as described above, it is heavy and difficult to handle during maintenance and replacement of the grinding roll for rice milling.
In addition, when used for a long time, the frictional heat during milling is stored in a thick grinding roll for milling rice, which is one of the reasons for raising the grain temperature. An increase in the temperature of the rice grains leads to a decrease in the moisture content of the rice grains, which has an adverse effect on the progress of the milled rice such as broken rice.
On the other hand, if a cylindrical body is formed of a thin metal body as a core metal and a diamond is used as an abrasive grain like the whitening roll of Patent Document 2, whitening work can be performed without reducing grinding efficiency with a lightweight whitening roll. Conceivable.

However, the whitening roll made of thin metal (thin metal plate) with a plate thickness of 3 to 15 mm cannot be said to be sturdy, and during long-time whitening work, it is deformed by the pressure from the rice grains sandwiched between the whitening cylinders, or the rice grains There is a high possibility of deformation as the temperature rises. It is thought that the possibility of deformation is particularly high in flat milled rice that increases the milling pressure.
An object of the present invention is to provide a grinding roll for milling rice that is lightweight and has high rigidity and that can suppress an increase in the temperature of rice grains.

[Means 1]
A grinding roll for rice milling of a rigid grinding type rice milling machine is composed of a cylindrical body and abrasive grains fixed to the surface thereof.
It is assumed that the cylindrical wall constituting the cylindrical body is formed into a double cylindrical hollow structure having an outer wall and an inner wall and having a hollow therebetween.
[Means 2]
In the means 1, the cylindrical wall constituting the cylindrical body is formed by the outer wall and the inner wall of the thin plate body.
[Means 3]
In the means 1, the cylinder wall which comprises the said cylindrical body is comprised with a metal.
[Means 4]
In the means 1, the cylindrical wall constituting the cylindrical body is constituted by one kind or plural kinds selected from FRP, synthetic resin, and carbon fiber.
[Means 5]
In the means 1, the hollow part of the cylindrical wall is filled with an inert gas such as argon gas or nitrogen gas.
[Means 6]
In means 1, the hollow part of the cylinder wall is evacuated.
[Means 7]
In the means 1, the reinforcing member for maintaining the space between the two walls is arranged in the hollow portion of the cylindrical wall over the outer wall and the inner wall.
[Means 8]
In means 1, the hollow portion of the cylindrical wall is filled with foamed resin.
[Means 9]
In the means 1 to 8, an air flow generating means is provided on the inner wall of the cylindrical wall and on the inner space side of the cylindrical body.
[Means 10]
In the means 1 to 9, the abrasive grains fixed to the surface of the cylindrical body are those obtained by fixing cBN abrasive grains by electrodeposition.

By making the cylinder wall hollow, the thickness dimension of the cylinder wall increases, but since the thin plate body is formed into a hollow structure, the entire grinding roll for milling rice is reduced in weight.
Since the cylindrical wall is provided with a hollow portion to increase the wall thickness of the cylindrical wall, the cylindrical wall has a large bending moment. For this reason, the grinding roll for rice milling with high rigidity can be obtained. In this case, the material of the cylindrical wall is not limited to metal, and a synthetic resin or the like having high rigidity can be used.
Since the cylindrical wall has a hollow portion, the overall heat capacity is small, and even when used continuously for a long time as a rice brewing machine for sake brewing, there is little heat storage in the grinding roll for rice milling, and the heat dissipation effect is also great. For this reason, the influence of the temperature rise with respect to the rice grain in polished rice can be suppressed.
If the airflow generating means is provided on the inner wall of the cylindrical wall on the inner space side surface of the cylindrical body, the cooling effect on the milling roll for rice milling is improved.

  When the cylindrical wall is made of metal, diamond abrasive grains, cBN abrasive grains, SiC abrasive grains, and the like can be firmly fixed to the cylindrical wall by electrodeposition.

BRIEF DESCRIPTION OF THE DRAWINGS The whole perspective view of the rice brewing machine for brewing in embodiment of this invention. The right view (part cross section) of the rice brewing machine for brewing of FIG. The expanded sectional view of a whitening part. The longitudinal cross-sectional front view of the grinding roll for rice polishing. The perspective view of the grinding roll for rice milling. [A] is a longitudinal sectional front view of a cylindrical wall in the second embodiment, and [B] is a side view (partial) along the B line in [A]. The longitudinal cross-section front view (part) of the cylinder wall in a 3rd Example.

A rice brewing machine 1 for brewing according to the first embodiment (FIG. 1) is a recirculating vertical rice milling machine, and includes a whitening unit 2, a storage tank 3, a boulder unit 4, a cerealing unit 5, and a control unit 6. .
The whitening portion 2 is a portion that whitens rice grains by a grinding action.
The storage tank 3 supplies rice grains to the whitening unit 2 and temporarily stores the rice grains during the whitening work for the whitening circulation work.

The ganishi portion 4 is a portion that separates the rice grains from the rice bran while moving the rice grains refined by the milling portion 2 downward, and the separated rice grains move to the lower part of the milled portion 5.
The cerealing unit 5 cereals the rice grains from the gangue unit 4 to the top of the storage tank 3, supplies the cereals to the storage tank 3, and circulates the rice grains.
The control unit 6 manages these series of operations by a program and a sequence capable of setting parameters.

The whitening unit 2, the storage tank 3, and the boulder unit 4 are installed on the whitening unit machine base 7. The cerealing unit 5 is installed on the cerealing unit machine base 8.
An upper workbench 9 is provided on the cerealing machine base 8, and a lower workbench 10 is provided on the milling machine base 7.

  Under the work management by the control unit 6, the brown rice stuck in the storage tank 3 is subjected to a whitening action in the whitening unit 2, and reaches the boulder unit 4. The rice grains separated from the straw at the gangue portion 4 are transferred to the lower part of the cerealing part 5 and then cerealed by the cerealing part 5 to the inlet of the storage tank 3. The rice grains repeat the above-mentioned circulation cycle, and the rice grains with the target yield of the initially introduced brown rice are finished.

The whitening portion 2 (FIG. 3) includes a grinding assembly 11, a whitening cylinder 12, and a discharge rod 13.
The top of the whitening cylinder 12 is a rice grain receiving port 14, and the base is fixed to the whitening machine base 7. A part of the base is cut out to form a feed port 15.
The grinding assembly 11 includes a saddle shaft 16, a pressing member 17, a grinding roll 18 for milling rice, and a roll cradle 19. The grinding assembly 11 is assembled around the saddle shaft 16. The milling roll 18 for rice milling, the pressing member 17 and the roll cradle 19 are all circular in plan view, and have a boss for the shaft 16 at the center.
The coffin shaft 16 is supported in the coffin direction with respect to the milling machine base 7, and is supported in the thrust direction by two bearing mechanisms 20, and is supported so as to be rotatable in the radial direction.

A roll cradle 19 is inserted into the mill shaft 16 and is fixed to the mill shaft 16 at the location of the boss 21, and a grinding roll 18 for milling rice is loosely fitted to the mill shaft 16 at the location of the boss 22. At the same time, it is placed on the roll cradle 19, and further, a pressing member 17 is fitted on the shaft 16 at the location of the boss 23 above the grinding roll 18 for milling rice. The presser member 17 has a lower edge contacting the upper surface of the grinding roll 18 for rice milling and is fixed to the upper end of the shaft 16 by a retaining bolt 24 inserted from above the boss 23.
As a result, the grinding assembly 11 is attached to the milling machine base 7, and the grinding roll 18 for polishing rice is sandwiched and fixed between the roll cradle 19 and the pressing member 17 by the fastening bolts 24. Therefore, the grinding assembly 11 is rotated with the shaft 16.

A polishing chamber 25 is formed between the inner peripheral surface of the milling cylinder 12 and the outer peripheral surface of the grinding roll 18 for polishing rice, and the bottom thereof is closed by the outer peripheral portion 26 of the roll cradle 19.
A passive pulley 27 is fixed to the lower end of the flange shaft 16 and is connected to be interlocked by a driving pulley of the motor M shown in a simplified manner and a V belt.
The feed port 15 provided at the base of the whitening cylinder 12 is open to the discharge basket 13, and the rice grains are guided to the boulder part 4 through the discharge basket 13. A pressure regulating valve 28 is disposed at the feed port 15. The pressure adjustment valve 28 changes its opening according to the rice grain pressure in the whitening chamber 25.

The milling roll 18 for rice milling (FIGS. 4 and 5) is composed of a cylindrical body 29 and abrasive grains 30 fixed to the surface thereof.
In this embodiment, the cylindrical wall 31 constituting the cylindrical body 29 is made of an aluminum alloy, and has a thin plate body outer wall 32 and inner wall 33 having a thickness of 3 to 15 mm. These are welded at the edges and sealed between them. The hollow portion 34 is formed into a double cylindrical hollow structure.
The outer wall 32 is formed into the same annular concavo-convex structure as that of a conventional hard sand roll by spinning.

Further, the inner wall 33 is basically formed in a cylindrical shape, and a stepped portion 35 is formed on the inner surface of the upper portion, and the stepped portion 37 for fixing the mounting flange 36 is formed on the inner surface of the lower portion. Molded. The pressing member 17 (FIG. 3) has a conical upper surface and is smoothly continuous with the surface of the cylindrical body 29. The abrasive grains 30 may also be arranged on the surface of the roll pressing member 17.
A boss 22 is provided at the center of the mounting flange 36. The boss 22 is for attaching the grinding roll 18 for milling rice to the shaft 16.
The formed hollow portion 34 is evacuated. Or after evacuating, it fills with inert gas, such as argon gas and nitrogen gas.

The thickness dimension of the cylindrical wall 31 constituting the cylindrical body 29 is 20 mm or more and 60 mm or less, preferably 25 mm or more and 40 mm or less in consideration of the rigidity as the grinding roll 18 for milling rice. This is the thickness dimension of the cylindrical wall 34, and is the wall thickness of the cylindrical body 29 formed by the outer wall 32 and the inner wall 33 forming the hollow portion 34.
That is, the milling roll 18 for milling rice is provided with a hollow portion 34 to increase the thickness of the cylindrical wall 34 and maintain sufficient rigidity for the whitening work, and the outer wall 32 and the inner wall 33 are formed of thin plate bodies. The total weight of the grinding roll 18 for milling rice is reduced.
The abrasive grains 30 fixed to the surface of the cylindrical body 29 are fixed (electrodeposited) with cBN abrasive grains by nickel plating (plating) or the like using the cylindrical body 29 made of an aluminum alloy as a core metal.

When the motor M is driven, the shaft 16 is driven via the passive pulley 27, and the milling roll 18 for milling rice rotates in the milling cylinder 12.
Rice grains are fed from the storage tank 3 to the milling chamber 25 through the receiving port 14 into the milling unit 2, and the rice grains are ground (milled) between the milling cylinder 12 and the milling roll 18 for milling. The rice grains that have passed through the whitening chamber 25 are received by the outer peripheral portion 26 of the roll cradle 19, and are eventually sent out from the feed port 15 to the discharge basket 13.

At this time, the milling roll 18 for milling rice is lightweight and can reduce power compared to a conventional rigor sand roll, while the cylindrical wall 31 of the cylindrical body 29 has a sufficient thickness and high rigidity. Withstands the pressure sometimes received from rice grains, it can perform precise whitening work.
Moreover, since the hollow part 34 which the cylindrical wall 31 of the grinding roll 18 for rice polishing has a heat insulation effect and the outer wall 32 and the inner wall 33 which comprise the cylindrical wall 31 are thin plate bodies, since heat capacity is small, the grinding roll for rice polishing The heat storage of 18 is suppressed, and the temperature rise of the rice grain by the polishing process can be suppressed.

FIG. 6 shows a part of the cylindrical wall 31 in the second embodiment, in which a hollow portion 34 is formed by the outer wall 32 and the inner wall 33, and a honeycomb structure 38 made of an aluminum alloy is loaded in the hollow portion. Yes. The honeycomb structure 38 can reduce the heat capacity of the cylindrical wall 31 as much as possible to avoid heat storage, and can be a reinforcing member for maintaining the space between the outer wall 32 and the inner wall 33, thereby enhancing the rigidity of the cylindrical wall 31.
FIG. 7 shows a part of the cylindrical wall 31 in the third embodiment, in which a hollow portion 34 is formed by the outer wall 32 and the inner wall 33, and the hollow portion is filled with a foamed resin 39. The foamed resin 39 can also reduce the heat capacity of the cylindrical wall 31 as much as possible to avoid heat storage, and can be a reinforcing member for maintaining the space between the outer wall 32 and the inner wall 33, thereby enhancing the rigidity of the cylindrical wall 31.

The embodiment has been described above.
In addition to metal, FRP, resin, ABS, carbon fiber, and the like are conceivable as materials constituting the outer wall 32 and the inner wall 33 of the cylindrical wall 31.
Means other than electrodeposition may be used, such as using an adhesive to fix the abrasive grains to the surface of the cylindrical body 32.
In the embodiment, the surface shape of the grinding roll 18 for milling rice is the same as that of the conventional gold and sand roll, but the shape in which the number of annular convex portions is increased or eliminated is a design matter.
Further, although not shown, air disturbance such as a slat or air blowing means such as a slat can be provided on the outer surface of the outer wall 32 or the inner surface of the inner wall 33 to enhance the cooling of the grinding roll 18 for rice milling.

  The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed as appropriate without departing from the scope of the invention.

  It can be used for the rotary shaft rice milling machine mainly for sake brewing.

DESCRIPTION OF SYMBOLS 1 Rice mill for brewing 2 Polishing part 3 Reservoir tank 4 Mangoku part 5 Grain county 6 Control part 7 Milling part machine base 8 Grain part machine base 9 Upper work table 10 Lower work table

DESCRIPTION OF SYMBOLS 11 Grinding assembly 12 Polishing cylinder 13 Discharge rod 14 Receptacle 15 Feed port 16 Rod shaft 17 Holding member 18 Grinding roll for milling rice 19 Roll receiving base 20 Bearing mechanism

21 Boss (for roll cradle)
22 Boss (for grinding roll for milling rice)
23 Boss (for holding member)
24 retaining bolt
25 Whitening chamber 26 Outer peripheral portion 27 Passive pulley 28 Pressure regulating valve 29 Cylindrical body 30 Abrasive grain

31 cylindrical wall 32 outer wall 33 inner wall 34 hollow portion 35 step portion 36 mounting flange 37 step portion 38 honeycomb structure 39 foamed resin

Claims (10)

It is a grinding roll for rice milling of a rigid grinding rice mill,
It consists of a cylinder and abrasive grains fixed to its surface,
A milling roll for milling rice, characterized in that the cylindrical wall constituting the cylindrical body is formed into a double cylindrical hollow structure having an outer wall and an inner wall and hollowed between them.   The grinding roll for milling rice according to claim 1, wherein a cylindrical wall constituting the cylindrical body is formed by an outer wall and an inner wall of a thin plate member.   The grinding roll for milled rice according to claim 1, wherein a cylindrical wall constituting the cylindrical body is made of metal.   The grinding roll for rice milling according to claim 1, wherein the cylindrical wall constituting the cylindrical body is composed of one or more kinds selected from FRP, synthetic resin, and carbon fiber.   The grinding roll for milled rice according to claim 1, wherein a hollow portion of the cylindrical wall is filled with an inert gas.   The grinding roll for milled rice according to claim 1, wherein the hollow portion of the cylindrical wall is in a vacuum.   The grinding roll for milling rice according to claim 1, wherein a reinforcing member for maintaining a space between the two walls is disposed in the hollow portion of the cylindrical wall over the outer wall and the inner wall.   The grinding roll for milled rice according to claim 1, wherein the hollow portion of the cylindrical wall is filled with foamed resin.   The grinding roll for milling rice according to any one of claims 1 to 8, wherein an air flow generating means is provided on the inner wall side of the cylindrical body on the inner wall side of the cylindrical wall.   The grinding roll for rice milling according to any one of claims 1 to 9, wherein the abrasive grains fixed to the surface of the cylindrical body are cBN abrasive grains fixed by electrodeposition.

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