JP2013091036A - Rice milling machine for sake brewing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recirculating vertical rice milling machine for Sake brewing that achieves improvement in grinding efficiency of a polishing roll.SOLUTION: The recirculating vertical rice milling machine for Sake brewing is configured as follows. A vertically-arranged polishing roll 11 is disposed in an outer cylinder 15. A clearance 16 is formed between the outer peripheral surface of the polishing roll 11 and the inner peripheral surface of the outer cylinder 15. Rice grains are repeatedly supplied to the clearance 16 and the rice grains are ground by the polishing roll 11. The outer peripheral surface of the polishing roll 11 is formed with annular grooves 19 and fixed with diamond abrasive grains. As a result, even though the shape of the outer peripheral surface of the polishing roll 11 is formed similar to the shape of the outer peripheral surface of a normal emery roll, the fixing of the diamond abrasive grains onto the grinding surface allows an increase in grinding efficiency due to improvement in cutting by the polishing roll 11 to the rice grains.

Description

  The present invention relates to a circulation type hard rice mill for sake brewing, in which rice grains are repeatedly ground by a milling roll arranged in a bowl and polished.

  Conventionally, a rice milling machine that grinds rice grains by rotating a milling roll is known. Rice mills include rice rice mills and sake brewers. The role of the milling roll is different between the rice mill for rice and the rice mill for sake brewing. This is because rice grains for sake brewing need to have a higher rice polishing ratio than rice grains for rice. For example, the rice milling machine of the following patent document 1 is premised on the rice rice (paragraph [0002] of patent document 1). In the rice milling machine of Patent Document 1, the grinding roll (corresponding to the milling roll) stops cutting the surface portion of the brown rice, and removes wrinkles by the subsequent friction roll to make white rice (paragraph [0015] of Patent Document 1).

  The brewing machine for brewing is generally a circulation type solid type (for example, Patent Document 2 below), and the rice grains are repeatedly ground for a long time with a milling roll arranged in a basket. By repeatedly grinding the rice grains in this way, the rice milling ratio of the rice grains can be increased. In a circulation type hard rice mill for brewing, a Kongo roll formed by baking and solidifying Kongo sand (silicon carbide) is used as a milling roll. In the circulation type rigid rice milling machine for sake brewing, the specification using the above-mentioned Kongo roll is established.

  On the other hand, it has been proposed to use a milling roll other than a Kongo roll in a rice mill for rice. Patent Document 1 describes that a large number of super hard abrasive grains such as industrial diamond are fixed on the outer peripheral surface of a grinding roll.

JP 2001-259446 A JP 7-308593 A

  In Patent Document 1, ultra-hard abrasive grains such as industrial diamond are used on the outer peripheral surface of a grinding roll because “the grinding roll of a grinding-type rice milling machine uses gold and sand, so there are many manufacturing restrictions and precision. This is because it was difficult to process and the shape was limited ”(paragraph [0002] of Patent Document 1). Therefore, in Patent Document 1, ultra-hard abrasive grains such as industrial diamond focus on “Precise processing is possible and desired grinding rolls can be manufactured” (paragraph [0021] of Patent Document 1). It is used as.

  That is, according to the description in Patent Document 1, superhard abrasive grains such as industrial diamond are one means for producing a desired roll shape. For this reason, super hard abrasive grains such as industrial diamond are used because the surface of the grinding roll is not a simple cylindrical surface, but a spiral shape described in Patent Document 1 (FIG. 2 of Patent Document 1) or a roll shaft. This is effective when a convex protrusion (FIG. 4 of Patent Document 1) extending in the direction is provided.

  For this reason, when using the already established ground surface shape of the metal-rigid roll, it is not necessary to use super hard abrasive grains such as industrial diamond. Further, the spiral shape described in Patent Document 1 and the convex protrusions extending in the roll axis direction are not suitable as the shape of the milling roll of a circulation type hard brewing rice mill.

  On the other hand, it is desirable to improve the grinding efficiency of the milling roll of the recycle type brewing rice mill for which the specifications are established. However, as described above, the description in Patent Document 1 did not suggest a technique for improving the milling roll used in the circulation type hard rice mill for brewing.

  An object of the present invention is to increase the grinding efficiency of a milling roll used in a circulation type hard rice mill for brewing.

  In order to achieve the above object, a brewing machine for sake brewing according to the present invention is a circulation type solid brewing machine for brewing, wherein a milled white mill roll is disposed in an outer cylinder, A gap is formed between the outer peripheral surface and the inner peripheral surface of the outer cylinder, rice grains are repeatedly supplied into the gap, and the rice grains are ground by the whitening roll, and the outer peripheral surface of the whitening roll is an annular groove. Is formed, and diamond abrasive grains are fixed.

  In this configuration, an annular groove is formed on the outer peripheral surface of the milling roll in the same manner as a metal-rigid roll used in a circulation-type solid brewing rice mill, and diamond abrasive grains are fixed. According to the configuration of the present invention, while the shape of the outer peripheral surface of the whitening roll is the same as the shape of the outer peripheral surface of the metal-rigid roll as described above, the rice grains of the whitening roll are fixed by fixing diamond abrasive grains to the grinding surface. It is possible to improve the grinding efficiency by improving the cutting with respect to. Further, by increasing the grinding efficiency, the required grinding efficiency can be ensured even if the whitening roll is downsized, the weight of the whitening roll can be reduced, and labor saving can be realized.

  The whitening roll is a hollow body, and a side surface portion is formed of a cylindrical body, and a hollow space is formed between the inner peripheral surface of the cylindrical body and the rotating shaft in a state where the whitening roll is attached to the rotating shaft. preferable. According to this configuration, the weight of the whitening roll can be reduced. That is, since the polishing roll of the present invention has diamond abrasive grains fixed to the outer peripheral surface, the inner side can be hollow as long as the shape of the outer peripheral surface is secured.

  The cylindrical body preferably has an inner peripheral surface shaped along the outer peripheral surface. According to this structure, it becomes advantageous by weight reduction of a whitening roll.

  The cylindrical body is made of metal, and the thickness of the metal plate is preferably in the range of 3 to 15 mm. This configuration is suitable for forming the cylindrical body into a thin-walled body, and the weight can be reduced while ensuring the strength within the range of the plate thickness as described above. The cylindrical body may be a casting, for example, or may be formed by cutting.

  The number of the annular grooves is preferably 3 or less. This configuration is more suitable as the configuration of the Kongo roll of the circulation type rigid brewing rice mill.

  According to the present invention, the shape of the outer peripheral surface of the whitening roll is the same as the shape of the outer peripheral surface of a normal metal-rigid roll, but the diamond abrasive grains are fixed to the grinding surface, thereby improving the cutting of the whitening roll to rice grains. Grinding efficiency. Further, by increasing the grinding efficiency, the required grinding efficiency can be ensured even if the whitening roll is downsized, the weight of the whitening roll can be reduced, and labor saving can be realized.

The schematic block diagram of the rice brewing machine for brewing which concerns on one Embodiment of this invention. The expanded sectional view which shows the principal part of the milling room | chamber interior of the rice brewing machine for brewing shown in FIG. The expansion perspective view of the whitening roll which concerns on one Embodiment of this invention. AA sectional view of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a rice brewing machine 1 for brewing according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing the main part inside the milling chamber 3 of the rice brewing machine 1 for brewing shown in FIG. First, a schematic configuration of the brewing rice mill 1 will be described with reference to FIGS. 1 and 2. The rice brewing machine 1 for brewing is made from a milled rice tank 2 for accumulating rice grains, a milling chamber 3 for milling rice grains dropped from the milled rice tank 2, and a boulder 4 and a boulder 4 for guiding rice grains milled in the milling chamber 3 downward. An elevator 5 for conveying rice grains toward the milled rice tank 2 is a main part.

  At the start of operation of the rice brewing machine 1 for brewing, rice grains to be polished are supplied into the elevator 5 from a supply port 6 attached to the elevator 5. The elevator 5 includes a belt 9, and a plurality of buckets 7 are attached to the belt 9. As the belt 9 descends, the bucket 7 is sequentially sent to the lower part of the elevator 5. The bucket 7 has an opening 8, and the bucket 7 scoops rice grains from the opening 8 side while moving integrally with the belt 9. As a result, rice grains are filled into the bucket 7.

  The bucket 7 filled with rice grains ascends as the belt 9 moves. In the upper part of the belt 9, rice grains are fed from the opening 8 of the bucket 7 toward the supply cylinder 10 attached to the elevator 5. The rice grains thrown into the supply cylinder 10 are supplied to the milled rice tank 2, and the rice grains are temporarily accumulated in the polished rice tank 2.

  The rice grains accumulated in the milled rice tank 2 fall toward the milling chamber 3 due to their own weight (arrow a). In the whitening chamber 3, a whitening roll 11 and an outer cylinder 15 arranged in a bowl are arranged. As shown in the enlarged view of FIG. 2, the whitening roll 11 is disposed so as to be wrapped in the outer cylinder 15. The whitening roll 11 is attached to the rotating shaft 17. A pulley 18 (FIG. 1) is fixed to the rotating shaft 17, and the pulley 18 and the rotating shaft 17 are rotated by driving with a belt (not shown) wound on the pulley 18, and the whitening roll 11 is integrally formed therewith. Rotates.

  A gap 16 is formed between the outer peripheral surface of the whitening roll 11 and the inner peripheral surface of the outer cylinder 15. Rice grains dropped from the milled rice tank 2 are introduced into the gap 16. As will be described in detail later, the outer peripheral surface of the whitening roll 11 is covered with a diamond abrasive grain layer 20 (FIGS. 3 and 4) including diamond abrasive grains 21 (FIG. 4). The rice grains are ground by the diamond abrasive grains 21 in the gap 16 by the rotation of the whitening roll 11.

  The rice grains that have been ground and passed through the gap 16 pass through the discharge port 25 and are discharged from the whitening chamber 3. In FIG. 1, the rice grains from the discharge port 25 are supplied to the gangue 4 through the discharge tube 23. The gangue 4 is arranged to be inclined toward the lower part of the elevator 5. For this reason, the rice grain on the gangue 4 is carried downward along the gangue 4 (arrow b). The bottom of Mangoku 4 has a net-like shape, and the casket falls from the net-like bottom. The fallen soot is collected through a collection cylinder 26 installed at the bottom of the gangue 4. The rice grains carried downward by the boulders 4 are transferred to the lower part of the elevator 5 through the input cylinder 24 attached to the elevator 5.

  Through the above-described series of steps, the rice grains are circulated once in the rice mill 1 for sake brewing, and the grinding of the rice grains once is completed. The second circulation movement path is the same as the first circulation movement path, and the second grinding is performed on the rice grains by the second circulation movement.

  Thereafter, the number of grinding of the rice grains increases each time the cyclic movement is repeated. By the grinding effect by the milling roll 11, brown rice bran is removed and the brown rice becomes white rice. Thereafter, as the number of times of grinding increases, the mass of white rice decreases and the milling rate increases. The rice polishing ratio is the ratio of the mass of white rice to its brown rice. If the mass of white rice at the time of milling is half of the mass of brown rice introduced at the beginning of milling, the milling rate will be 50%.

  In polished rice grains for rice, rice grains are removed from brown rice to make white rice, but the amount of grinding after white rice is sufficient. On the other hand, rice grains for sake brewing are not enough for polished rice with the degree of removing rice bran from rice, so it is necessary to reduce protein and fat and increase the ratio of starch in the center of rice grains. For this reason, it is necessary for rice grains for sake brewing to increase the rice polishing ratio compared to rice grains for rice. Specifically, the rice polishing ratio of rice grains for cooked rice is about 90%, but for rice grains for sake brewing, it is about 30 to 70% and may be less than 30%.

  For this reason, the specification of the apparatus is different between the rice rice mill for rice and the rice mill for sake brewing. As described above, in the rice rice milling machine described in Patent Document 1, the grinding roll corresponding to the whitening roll only stops the surface portion of the brown rice, and the subsequent friction roll removes wrinkles to make white rice. Rice grains for rice do not need to increase the polishing ratio, and usually the number of times that the grains are supplied to the grinding roll and the friction roll is sufficient.

  On the other hand, in the rice brewing machine for brewing, the rice grains are repeatedly ground while circulating in the rice brewing machine 1 for brewing as in the rice brewing machine 1 for brewing. That is, in the rice brewing machine 1 for brewing, after the required amount of rice grains is introduced, new rice grains are not introduced, but the same rice grains as at the initial introduction are ground until the necessary rice polishing ratio is achieved. Will be returned. As a result, a rice grain suitable for brewing can be obtained by increasing the rice polishing ratio. For this reason, in the rice brewing machine 1 for brewing, the rice grains are ground many times by the whitening roll 11 for a long time.

  Therefore, the rice milling machine and the sake brewing machine have different performance requirements for the milling roll, and the grinding surfaces of the milling rolls (grinding rolls) of both milling machines are different. In the rice rice milling machine described in Patent Document 1, as described above, the shape of the grinding roll is described as a spiral shape or a shape in which convex protrusions extending in the roll axis direction are formed. It was not suitable for the type of rice brewer for sake brewing.

  On the other hand, in a circulation type hard brewer's rice mill such as a brewer's rice mill 1, a kongo roll formed by baking and hardening kongo sand (silicon carbide) on a milling roll is used. The Kongo roll has a high hardness, and the cutting of the rice grains by grinding is also good. In addition, the Kongo roll used in the circulation type rigid rice mill for brewing has established a ground surface shape for increasing the rice milling ratio and obtaining rice grains suitable for brewing.

  Specifically, the shape of the grinding surface of the rugged roll used in the circulation type hard rice mill for brewing is the same as the shape of the outer peripheral surface of the cylindrical body 12 of the whitening roll 11 shown in FIG. Two annular grooves 19 are formed on the outer peripheral surface of the cylindrical body 12. The annular groove 19 is closed on the outer peripheral surface of the cylindrical body 12. That is, the two grooves 19 do not form a spiral groove but constitute one independent groove. Although there are two grooves 19 in FIG. 2, there are one or three grooves. In any case, the proportion of the groove 19 on the surface of the cylindrical body 12 is increased, which is different from the specification in which the spiral groove is continuously formed.

  As described above, in the circulation type rigid rice brewing machine for brewing, a Kongo roll is used as the milling roll, and the shape of the grinding surface is established. For this reason, it is considered that there is no need to replace the milling roll with a milling roll other than the Kongo roll in the circulation type hard brewing rice mill. If an attempt is made to improve the whitening roll in the circulation type hard brewing rice mill, it is expected that drastic specification changes such as deriving at least a new grinding surface shape will be required.

  About the rice milling machine for rice rice, the said patent document 1 has description about the specification of the grinding roll equivalent to a milling roll. The grinding roll described in Patent Document 1 uses superhard abrasive grains such as industrial diamond on the outer peripheral surface of the grinding roll. However, as described above, according to the description in Patent Document 1, superhard abrasive grains such as industrial diamond are one means for producing a desired roll shape. For this reason, when using the already established ground surface shape of the metal-rigid roll, it is not necessary to use super hard abrasive grains such as industrial diamond.

  On the other hand, the inventor of the present application tried to improve the milling roll used in the circulation type rigid rice brewing machine for sake brewing through trial manufacture and experiment. As a result, the inventor of the present application has found that the grinding efficiency can be improved as compared with the grinding with the metal-rigid roll by fixing the diamond abrasive grains to the grinding surface while the shape of the grinding surface is the same as that of the conventional metal-rigid roll. It was. In the present embodiment, the grinding efficiency refers to the grinding mass per unit time of the whitening roll.

  Hereinafter, the configuration of the whitening roll 11 of the present embodiment will be described more specifically. In FIG. 2, the whitening roll 11 is formed by attaching an upper lid 13 and a roll receiving plate 14 to the upper and lower sides of a cylindrical body 12 constituting an outer peripheral shape, respectively. As described above, the cylindrical body 12 is formed with an annular groove 19 along the outer periphery of the cylindrical body 12. It is the same as the surface shape of the side surface of the metal-rigid roll used.

  FIG. 3 shows a perspective view of the whitening roll 11 shown in FIG. FIG. 4 shows a cross-sectional view taken along line AA in FIG. 3 and 4 show a diamond abrasive grain layer 20 that is not shown in FIG. The polishing roll 11 of the present embodiment is not a metal-rigid roll, but covers the entire outer peripheral surface of the cylindrical body 12 to cover the diamond abrasive grain layer 20 to form a grinding surface. The diamond abrasive layer 20 is formed by electrodeposition. As shown in FIG. 4, diamond abrasive grains 21 are fixed to the cylindrical body 12 by a metal plating layer 22 formed on the outer peripheral surface of the cylindrical body 12.

  The inventor of the present application has confirmed the experiment by using the whitening roll 11 according to the present embodiment as an example and using a rugged roll as a comparative example. The shape of the grinding surface is the same between the example and the comparative example. The difference between the example and the comparative example is that the grinding surface of the example is the diamond abrasive layer 20, whereas the grinding surface of the comparative example is gold sand.

  As a result of the comparative experiment, it was confirmed that the time for the example to reach the same rice polishing rate was shortened compared to the comparative example. From this, it can be said that the cutting | disconnection with respect to a rice grain is improving the Example compared with the comparative example. Specifically, it was confirmed that the grinding efficiency of the example was about 1.5 to 2 times that of the comparative example. In other words, the grinding mass per unit time in the example is twice as large as that in the comparative example.

  That is, even if the shape of the grinding surface in the whitening roll is the same, forming the grinding surface with the diamond abrasive grain layer 20 significantly increases the grinding efficiency compared to forming the grinding surface with gold sand. Further, the whitening roll 11 could be reduced in weight as follows.

  Since the rugged roll is formed by processing a block of rugged sand, the mass increases. On the other hand, the whitening roll 11 of the present embodiment has a diamond abrasive grain layer 20 coated on the outer peripheral surface, and the inside can be made hollow. For this reason, the whitening roll 11 is a hollow body, and a hollow space is formed between the inner peripheral surface of the cylindrical body 12 and the rotating shaft 17 to reduce the weight.

  Also, the outer peripheral surface of the cylindrical body 12 shown in FIG. 2 has an irregular shape formed by an annular groove 19, and the inner peripheral surface is shaped along the outer peripheral surface. As a result, the cylindrical body 12 can be made thinner and lighter.

  Thus, in order to make the cylindrical body 12 thin, it is preferable to form the cylindrical body 12 from metal. As a method for forming the thin-walled body, for example, casting or shaving can be mentioned. In this case, the metal plate thickness is preferably in the range of 3 to 15 mm, and more preferably in the range of 3 to 13 mm. If it is in the range of such plate | board thickness, weight reduction can be achieved, ensuring intensity | strength. Further, if the cylindrical body 11 is formed by combining a plurality of annular bodies, it becomes easy to form each annular body.

  Moreover, the whitening roll 11 of this embodiment can also achieve weight reduction, when grinding efficiency improves. That is, as a result of improving the grinding efficiency, the required grinding efficiency can be ensured even if the whitening roll 11 is downsized. As a result of the experiment, the grinding efficiency equal to or higher than that of a metal-rigid roll having a diameter of 26 inches (66 cm) and a mass of 182 kg could be exhibited by the whitening roll 11 having a diameter of 20 inches (50.8 cm) and a mass of 45 kg. In addition, the power saving can be realized because the driving power can be reduced by reducing the weight of the whitening roll 11.

  As another effect accompanying the improvement of grinding efficiency, it was confirmed that the rice grain temperature was suppressed. During milling, the load applied to the rice grains is controlled by adjusting the opening area of the discharge port 25 shown in FIG. As described above, in the milling roll 11 of the present embodiment, the breakage of rice grains is improved, so that the load of rice grains in the milled rice can be reduced. This reduces the friction between the rice grains and reduces the temperature rise of the rice grains.

  In the said embodiment, although the example which formed the diamond abrasive grain layer 20 by electrodeposition demonstrated, the diamond abrasive grain 21 should just be fixed to the outer peripheral surface of the whitening roll 11, and another means may be used. The overall structure of the brewer's rice mill 1 shown in FIG. 1 is merely an example, and any other structure may be used as long as it is a circulation type solid brewer's rice mill.

DESCRIPTION OF SYMBOLS 1 Rice mill for sake brewing 2 Rice milling tank 3 Milling room 40,000 stone 5 Lifting machine 11 Milling roll 12 Cylindrical body 15 Outer cylinder 16 Crevice 20 Diamond abrasive grain layer 21 Diamond abrasive grain 22 Metal plating layer

Claims (5)

A circulation type hard rice mill for sake brewing,
精 The arranged whitening roll is arranged in the outer cylinder,
A gap is formed between the outer peripheral surface of the whitening roll and the inner peripheral surface of the outer cylinder,
In the gap, rice grains are repeatedly supplied and the rice grains are ground by the whitening roll,
A rice mill for brewing, wherein an outer circumferential surface of the whitening roll is formed with an annular groove, and diamond abrasive grains are fixed thereto.   The said whitening roll is a hollow body, a side part is comprised with a cylindrical body, and the hollow space is formed between the internal peripheral surface of the said cylindrical body, and a rotating shaft in the state which attached the said whitening roll to the rotating shaft. 1. A rice mill for brewing according to 1.   The rice brewer for brewing according to claim 2, wherein the cylindrical body has an inner peripheral surface formed along the outer peripheral surface.   The rice mill for brewing according to claim 2 or 3, wherein the cylindrical body is made of metal, and the thickness of the metal is in the range of 3 to 15 mm. 5. The rice brewing machine for brewing according to claim 1, wherein the number of the annular grooves is 3 or less.

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