JP6879028B2 - Rice milling machine for sake brewing - Google Patents

Description

The present invention relates to a rice milling machine for sake brewing that polishes sake brewed rice.

Conventionally, a circulation type hard-grinding rice mill is often used for polishing sake brewed rice that is subjected to extreme grinding rice polishing (yield 45% or the like) (Patent Document 1). In this type of rice milling machine for sake brewing, vertically arranged grinding rolls (polishing rolls) are arranged in a polishing cylinder, and a polishing chamber is formed between the outer peripheral surface of the grinding roll and the inner peripheral surface of the polishing cylinder. After being formed, rice grains are repeatedly supplied to the polishing chamber to perform polishing by grinding.

Grinding rolls are usually formed by molding Kongo sand (silicon carbide) together with a binder and sintering it into a cylindrical body (called a Kongo roll). Since the sintered body is brittle without a constant wall thickness, the Kongo roll has a thick cross section and a large weight (50 to 70 kg) as shown in Patent Document 1.
The Kongo roll as a whitening roll has a well-established form of integral molding in which an annular convex portion is provided in several steps in the vertical direction on the surface side of the tubular wall constituting the cylindrical body.

In the rice milling machine for sake brewing of Patent Document 2, it is proposed to reduce the weight of the whitening roll by forming the side surface portion of the whitening roll with a thin metal cylinder. This polishing roll keeps the outer shape of a conventional Kongo roll having an annular convex portion, and forms a cylindrical body with a thin metal (metal thin plate) having a uniform thickness of 3 to 15 mm.
The rice milling machine for sake brewing in Patent Document 2 employs diamond abrasive grains in order to improve the grinding efficiency, and is fixed to the surface of the thin-walled cylindrical body. By adopting diamond abrasive grains, the grinding efficiency is improved, and even if the polishing roll is miniaturized, the required grinding efficiency can be secured, and the weight of the polishing roll can be further reduced.

Japanese Unexamined Patent Publication No. 4-11958 Japanese Patent No. 5897301

The current Kongo roll is completed as a grinding roll in terms of both morphology and material, but as described above, it is heavy and difficult to handle during maintenance or replacement of the grinding roll.
On the other hand, if a cylindrical body is formed of a thin metal body as a core metal like the whitening roll of Patent Document 2 and diamond is used as the abrasive grains, the whitening work can be performed without lowering the grinding efficiency with the lightweight whitening roll. Conceivable.

However, the whitening roll made of thin metal (thin metal plate) with a thickness of 3 to 15 mm is not sturdy, and during long-term whitening work, it may be deformed by the pressure from the rice grains sandwiched between the whitening cylinder and the rice grains. There is a high possibility that it will be deformed as the temperature of the rice rises. It is considered that there is a high possibility of deformation in flat rice milling in which the rice milling pressure is increased.
An object of the present invention is to provide a grinding roll that is lightweight, has high rigidity, and can suppress an increase in rice grain temperature.

[Means 1]
It is a grinding roll of a rigid grinding type rice mill, and is composed of a cylindrical body and abrasive grains fixed to the surface thereof.
It is assumed that the cylinder wall constituting the cylindrical body is stealed by providing a cavity in the cross section of the cylinder wall.
[Means 2]
The grinding roll according to claim 1, wherein the tubular wall constituting the cylindrical body is made of metal, and an annular cavity is provided in the cross section of the tubular wall.
[Means 3]
As a specific example of the means 1, the grinding roll is formed by stacking round sliced partial rolls. Grooves are formed so as to face each other on the joint surfaces of the partial rolls. When the partial rolls are stacked, a cylinder wall is formed to form a cylindrical body, and the grooves are combined to form a structure in which a cavity is formed in the cross section of the cylinder wall. The groove may have an annular shape, a divided annular shape, a lotus root hole shape, or a lump shape.
[Means 4]
In means 1 to 3, the cavity may be connected to the inner space by a plurality of openings connected to the inner space of the cylindrical body.
[Means 5]
In means 1 to 4, the abrasive grains fixed to the surface of the cylindrical body may be cBN abrasive grains fixed by electrodeposition.

By providing a cavity in the cylinder wall, the thickness dimension of the cylinder wall is increased, but the cavity steals meat and reduces the weight of the entire grinding roll.
By providing a cavity in the cylinder wall, the wall thickness of the cylinder wall becomes large, so that the cylinder wall has a large bending moment. Therefore, a highly rigid grinding roll can be obtained. In this case, if the material of the cylinder wall is metal, the rigidity is further increased.
In a grinding roll in which circularly sliced partial rolls are stacked, a cavity can be formed in the cross section of the tubular wall when the grooves are arranged to face each other on the joint surfaces of the partial rolls, so that it is easy to create a cavity in the tubular wall. .. In this case, the shape of the cavity can be variously formed including an annular shape.

In the case where the cavity is provided with a plurality of openings leading to the inner space of the cylindrical body, air flows through the openings through the openings as the grinding roll rotates. Therefore, it is possible to suppress the temperature rise of the rice grains due to the heat storage of the grinding roll.
When the cylinder wall is made of metal, diamond abrasive grains, cBN abrasive grains, SiC abrasive grains and the like can be firmly fixed to the cylinder wall by electrodeposition.
Further, if the grinding roll has a structure in which round slice-shaped partial rolls are stacked, the individual partial rolls have a size and weight that are easy to handle. Can be reduced.

An overall perspective view of a rice milling machine for sake brewing according to an embodiment of the present invention. Right side view (partial cross section) of the rice mill for sake brewing in FIG. An enlarged cross-sectional view of the polished part. Longitudinal section of the grinding roll. Perspective view of the grinding roll. FIG. 3 is a cross-sectional plan view of a grinding roll portion along the line AA of FIG.

The rice milling machine for sake brewing 1 (FIG. 1) of the embodiment is a circulation type vertical rice milling machine, and includes a polishing unit 2, a storage tank 3, a mangoku unit 4, a grain frying unit 5, and a control unit 6.
The polishing portion 2 is a portion for polishing rice grains by a grinding action.
The storage tank 3 supplies rice grains to the whitening portion 2 and temporarily stores the rice grains during the whitening work for the whitening circulation work.

The Mangoku portion 4 is a portion that separates the rice grains and the bran while moving the rice grains refined in the polishing portion 2 downward, and the separated rice grains move to the lower part of the fried grain portion 5.
The fried grain portion 5 lifts the rice grains from the mangoku portion 4 to the top of the storage tank 3 and supplies the rice grains to the storage tank 3 to circulate the rice grains.
The control unit 6 manages these series of operations by a program and a sequence in which parameters can be set.

The whitening section 2, the storage tank 3, and the Mangoku section 4 are installed on the whitening section machine base 7. Further, the fried grain section 5 is installed on the fried grain section machine stand 8.
The fried grain machine base 8 is provided with an upper working table 9, and the polishing part machine table 7 is provided with a lower working table 10.

Under the work management by the control unit 6, the brown rice placed in the storage tank 3 undergoes a whitening action in the whitening part 2, and then reaches the mangoku part 4, and the rice grains separated from the bran in the mangoku part 4 , It is transferred to the lower part of the fried grain part 5, and is fried by the fried grain part 5 to the input port of the storage tank 3. The rice grains repeat this circulation cycle, and the brown rice that was initially introduced is finished into the target yield of sake rice.

The polishing portion 2 (FIG. 3) includes a grinding assembly 11, a polishing cylinder 12, and a discharge gutter 13.
The upper part of the whitening cylinder 12 is a rice grain receiving port 14, and the base portion is fixed to the whitening part machine base 7. A part of the base is cut out to form a feeding port 15.
The grinding assembly 11 includes a vertical shaft 16, a holding member 17, a grinding roll 18, and a roll cradle 19, and is assembled around the vertical shaft 16. The grinding roll 18, the pressing member 17, and the roll cradle 19 are all circular in a plan view, and have a boss with respect to the vertical shaft 16 in the center.
The vertical shaft 16 is pivotally supported in the vertical direction with respect to the milling machine base 7, is maintained in the thrust direction by two bearing mechanisms 20, and is rotatably supported in the radial direction.

A roll cradle 19 is fitted into the vertical shaft 16 and fixed to the vertical shaft 16 at the position of the boss 21, and a grinding roll 18 is loosely fitted to the vertical shaft 16 at the position of the boss 22. It is placed on the roll cradle 19, and a pressing member 17 is fitted and inserted into the vertical shaft 16 at the position of the boss 23 above the grinding roll 18. The lower edge of the pressing member 17 comes into contact with the upper surface of the grinding roll 18, and is fixed to the upper end of the vertical shaft 16 by a fastening 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 is sandwiched and fixed between the roll pedestal 19 and the pressing member 17 by the fastening bolt 24. Therefore, the grinding assembly 11 is rotated together with the vertical shaft 16.

A polishing chamber 25 is formed between the inner surface of the polishing cylinder 12 and the outer peripheral surface of the grinding roll 18, and the bottom portion 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 vertical shaft 16 and is connected to the drive pulley of the motor M shown briefly by a V-belt.
The feeding port 15 provided at the base of the polishing cylinder 12 is opened in a discharge gutter 13 for guiding rice grains to the Mangoku portion 4, and a pressure adjusting valve 28 is arranged in this opening. The pressure adjusting valve 28 has an opening degree that changes according to the rice grain pressure in the polishing chamber 25.

The grinding roll 18 (FIG. 4) is divided into a plurality of annular partial rolls 18a to 18d, and the partial rolls 18a to 18d are vertically laminated and integrally formed.
The partial rolls 18a to 18d are made of an aluminum alloy in this embodiment, and as shown in the figure, the annular grooves (29a, 29b), (30a, 30b), respectively, facing the surfaces to which the partial rolls 18a to 18d are joined. (31a, 31b) are formed. Further, cBN abrasive grains are fixed to the outer peripheral surfaces of the partial rolls 18a to 18d by electrodeposition.
That is, the grinding roll 18 is composed of a cylindrical body 32 formed by a plurality of laminated partial rolls 18a to 18d and cBN abrasive grains 33 fixed to the surface thereof (FIG. 5).

The cylinder wall 34 constituting the cylindrical body 32 is formed of an aluminum alloy, and is formed by facing the annular grooves (29a, 29b), (30a, 30b), (31a, 31b) in the cross section of the cylinder wall 34. It will have the formed annular cavities 29, 30, 31.
The annular cavities 29, 30, and 31 are each provided with a plurality of openings 36 connected to the inner space 35 of the cylindrical body 32 (FIGS. 5 and 6). These openings 36 are formed by cutting out the inner groove walls of the annular grooves (29a, 29b), (30a, 30b), and (31a, 31b).

The thickness dimension of the cylinder wall 34 constituting the cylindrical body 32 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 of the grinding roll 18. This is the thickness dimension of the cylinder wall 34, which includes the annular cavities 29, 30, and 31 in the cross section of the cylinder wall 34.
Therefore, the grinding roll 18 increases the thickness of the cylinder wall 34 to maintain sufficient rigidity for the polishing work, and reduces the weight of the cylinder wall 34 and the entire grinding roll 18 by stealing meat by the annular cavity 29 or the like. There is.
In this embodiment, the grinding roll 18 is provided with a circular mounting flange 37 inside the third-stage partial roll 18c constituting the cylindrical body 32 (FIG. 4), and has the boss 22 in the center thereof. ..

The plurality of partial rolls 18a to 18d are provided with uneven portions for positioning on the upper and lower surfaces, the upper surface or the lower surface thereof, and by stacking them at the time of polymerization, the partial rolls 18a to 18d can be easily positioned coaxially. is there.
Further, the pressing member 17 also has a conical lower edge fitted into a recess provided on the upper surface of the upper end partial roll 18a so as to be smoothly continuous with the surface of the upper end partial roll 11a.
Abrasive grains may also be arranged on the surface of the roll pressing member 17.

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

At this time, the grinding roll 18 is lightweight and can reduce the power as compared with the conventional Kongo roll, while the cylinder wall 34 of the cylindrical body 32 has a sufficient thickness dimension and high rigidity. Withstands the pressure received from, and can perform precise whitening work.
Further, as the grinding roll 18 rotates, air moves in the inner space 35 of the cylindrical body 32, and air flows through the annular cavities 29, 30, and 31 through the plurality of openings 36 (FIG. 6). As a result, the heat storage of the grinding roll 18 is suppressed, and the temperature rise of the rice grains due to the polishing work is reduced.

The above description has focused on one embodiment.
In the embodiment, the cavity provided in the cross section of the tubular wall 34 is an annular shape, but the cavity is formed in a divided annular shape, a lotus root hole shape, a lump shape, or the like. Any cavity that is effective as a meat stealer will do.
In the embodiment, the grinding roll 18 is divided into four partial rolls as an example, but the grinding roll 18 may be divided into a size and a weight that are easy to handle.
On the other hand, if it is possible to steal meat by providing a cavity in the cross section of the cylinder wall 34, it is not necessary to divide the grinding roll 18 into partial rolls, and the grinding roll 18 can be integrally formed.
As the material constituting the cylinder wall 34, FRP, resin, ABS, carbon fiber and the like can be considered in addition to metal.
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 form of the grinding roll 18 is the same as that of the conventional Kongo roll, but the form in which the number of annular convex portions is increased or eliminated is a design matter.

Further, the cavity 29 in the cylinder wall 34 may have a form in which annular cavities 29 and the like located above and below are continuous with each other in the vertical axis direction.
The grinding roll 18 may change the grain size of the abrasive grains or the quality of the abrasive grains, for example, diamond abrasive grains, for each of the partial rolls 18a, 18b, and 18c.
The present invention is not limited to the above-described embodiment, and its configuration can be appropriately changed as long as it does not deviate from the scope of the invention.

It can be used for vertical shaft rotary rice milling machines, mainly rice milling machines for sake brewing.

1 Rice milling machine for sake brewing 2 Polishing part 3 Storage tank 40,000 stones part 5 Fried grain group 6 Control unit 7 Polishing part machine stand 8 Grain-raising part machine stand 9 Upper workbench 10 Lower workbench 11 Grinding assembly 12 Polishing cylinder 13 Discharge gutter 14 Receiving port 15 Feeding port 16 Vertical shaft 17 Holding member 18 Grinding roll 19 Roll cradle 20 Shaft mechanism 21 Boss (of roll cradle)
22 Boss (of grinding roll)
23 Boss (of holding member)
24 Fastening bolt 25 Polishing chamber 26 Outer peripheral part 27 Passive pulley 28 Pressure regulating valve 29 Circular cavity 29a, 29b Circular groove 30 Circular cavity 30a, 30b Circular groove 31 Circular cavity 31a, 31b Circular groove 32 Cylindrical body 33 cBN Abrasive grain 34 Cylinder wall 35 Inner space 36 Opening 37 Mounting flange

Claims (5)

It is a grinding roll of a rigid grinding type rice mill, and consists of a cylindrical body and abrasive grains fixed to its surface.
The cylinder wall that constitutes the cylindrical body is a grinding roll characterized in that a cavity is provided in the cross section of the cylinder wall and the meat is stolen. The grinding roll according to claim 1, wherein the tubular wall constituting the cylindrical body is made of metal, and an annular cavity is provided in the cross section of the tubular wall. The grinding roll is formed by stacking round-cut partial rolls, and is formed by stacking annular grooves on each of the joint surfaces of the partial rolls, and is formed by stacking the partial rolls. The grinding roll according to claim 1 or 2, wherein an annular cavity is formed in the cross section of the cylindrical wall by combining the annular groove on the wall, and the meat is stolen. The grinding roll according to claim 2, wherein the annular cavity is connected to the inner space by a plurality of openings connected to the inner space of the cylinder. The grinding roll according to any one of claims 1 to 4, wherein the abrasive grains fixed to the surface of the cylindrical body are cBN abrasive grains fixed by electrodeposition.

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