JP2011255328A - Rice polishing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice polishing apparatus capable of efficiently cooling the inside of a milling chamber while reducing machine load to completely prevent the quality of polished rice from lowering by transformation.SOLUTION: The rice polishing apparatus comprises a subterranean heat exchanging device 1, and a rice polishing chamber 30. The subterranean heat exchanging device 1 is constituted by stacking a plurality of hole-bored concrete blocks 10 so as to form a winding ventilation flue 12 passing through from one end to the other end by connecting their bored holes windingly, and laying under the ground. The rice polishing chamber 30 comprises a turbo fan 31 for forced cooling, a cooling device 32, a rice polishing machine 40, a bran suction fan 50, and a bran chamber 51, and the respective components are appropriately connected. Cooled air primarily cooled and humidified by the subterranean heat exchanging device 1 and cooled air secondarily cooled by the cooling device 32 are delivered to a milling roll 44 by the cooperative action of the turbo fan 31 for forced cooling and the bran suction fan 50 to cool the inside of the milling chamber 42.

Description

  The present invention relates to a rice milling apparatus, and more particularly to a rice milling apparatus provided with a cooling mechanism for milling brown rice at a low temperature.

  In a conventional rice milling apparatus at a coin rice mill, rice grains exceed 50 ° C. due to frictional heat caused by milling when milling brown rice. If the grain of rice exceeds 50 ° C. during such milling, the contained protein will change and white rice will become cloudy, and when the heated polished rice is returned to room temperature, the water will evaporate in the process, Dried and overdried. Such white rice has a significantly reduced flavor even if it is originally of good quality. Therefore, in order to obtain delicious rice, it is necessary to polish the rice at 40 ° C. or lower.

  However, the conventional rice milling apparatus in a coin rice mill can increase the temperature of the milling roll due to frictional heat generated by milling, and the milling chamber can rise to about 80-90 ° C in the summer. . In view of this, there has been proposed an apparatus for cooling the polishing roll by hollowing the rotating shaft of the polishing roll and sending outside air into the shaft. However, even in this cooling device, the outside air to be taken in is 30 ° C. to 40 ° C. in the summer, and the milling roll cannot be cooled below that, so that the temperature increased by the frictional heat is not significantly reduced. It was not possible to completely prevent alteration due to temperature, such as generation of cloudy rice.

  In view of the above-mentioned problems, the applicant of the present application has previously cooled the milling chamber in the rice milling apparatus to keep the temperature in the milling chamber at 38 ° C. or lower even in summer when the temperature is high, thereby preventing quality deterioration due to the deterioration of white rice in the milling. We have proposed a patentable “spinning chamber cooling device” and obtained a patent (see Patent Document 1).

JP 2000-254529 A

  Although this invention of “sperm chamber cooling device” has made a great contribution to achieving the original purpose, it has raised a new problem. That is, in the conventional rice milling apparatus, the air for feeding the cooling air into the milling chamber is utilized by sucking the cooling air simultaneously with the sucking of the koji by utilizing the suction force of the koji by the koji suction fan. The method of sucking the cooling air was used. According to this method, the load of the soot suction fan is increased, causing a mechanical failure, and there is a limit to the amount of cooling air sucked, resulting in poor cooling efficiency.

  Accordingly, in view of the above problems, the present invention provides a rice milling apparatus that can efficiently cool the milling chamber while reducing the mechanical burden, and thus can completely prevent deterioration in quality due to deterioration of white rice. This is a problem.

  In order to solve the above-mentioned problems, the present invention provides a rice milling device comprising a ground heat exchange device and a rice milling chamber, wherein the ground heat exchange device folds a plurality of perforated concrete blocks with their holes folded. The zigzag air passages are stacked and embedded in the basement so that a zigzag air passage that leads from one end to the other end is formed. In addition, the other end is connected to a forced cooling turbo fan in the rice milling chamber via a ventilation path, and the rice milling chamber is configured to include a forced cooling turbo fan, a cooling device, a rice mill, a rice bran suction fan, A hollow-shaft type milling row having a forced cooling turbo fan and a cooling device connected through a ventilation path, and having a vent hole in a roll surface mounted in the milling chamber of the cooling device and the rice milling machine. The hollow shaft base end of the rice mill is connected through a ventilation path, and further, a milling chamber and a paddy suction fan in a rice mill are connected through a feeding path, and the paddy suction fan and the paddy chamber are fed. The air is primarily cooled and moistened by the underground heat exchange device and the air secondarily cooled by the cooling device by the joint action of the forced cooling turbo fan and the soot suction fan. By supplying air to the milling roll, the milling chamber is cooled to cool the rice.

  According to the rice milling apparatus according to the present invention, cooling air is fed into the milling chamber by the cooperative action of the forced cooling turbo fan and the straw suction fan, which contributes to a reduction in the mechanical burden and also feeds a large volume of cooling air. As a result, it is possible to significantly improve the breakage of rice bran and to cool the milling chamber more efficiently, and as a result, it is possible to completely prevent quality deterioration due to deterioration of white rice that is polished. , Has an unprecedented excellent effect.

It is typical explanatory drawing which shows embodiment of the rice milling apparatus concerning this invention.

  In the present invention, when cooling air is supplied to cool the inside of the semen chamber 42, the mechanical action is reduced by performing the joint action of the forced cooling turbo fan 31 for supplying air and the suction suction fan 50 for suction. In addition, the greatest feature is that the cooling efficiency is improved. Hereinafter, embodiments of a rice milling apparatus according to the present invention will be described with reference to the drawings.

  Note that the rice milling apparatus according to the present invention is not limited to the examples and illustrated structures described below, and can be changed as appropriate without departing from the spirit and structure of the present invention.

FIG. 1 is a schematic explanatory view showing a rice milling apparatus according to the present invention.
That is, the rice milling apparatus according to the present invention includes the underground heat exchange device 1 and the rice milling room 30.

  The underground heat exchange device 1 is for temporarily cooling and humidifying the outside air sucked from the outside air inlet 20, and is formed by stacking a plurality of perforated concrete blocks 10 in the basement. The perforated concrete block 10 is, for example, a commercially available perforated concrete block 10 that is used for a fence or the like and has holes formed for the purpose of inserting a reinforcing bar or reducing the weight. A vertical hole is dug in the basement, and the perforated concrete block 10 is stacked in the hole so that the holes are connected sideways and continuous. And the both ends of the continuous hole are covered with the recessed groove forming concrete product 11 so that the upper and lower holes can communicate with each other, and a zigzag air passage 12 leading from one end to the other end is formed. To.

  One end of the zigzag folded air passage 12 is connected to the outside air inlet 20 through the air passage 22. The other end of the zigzag folded air passage 12 is connected to a forced cooling turbofan 31 in the rice milling chamber 30 via the air passage 22. And the vertical hole in which the stacked perforated concrete block 10 was stored is filled up.

The rice milling chamber 30 includes a forced cooling turbo fan 31, a cooling device 32, a rice milling machine 40, a rice bran suction fan 50, and a rice bran chamber 51.
The forced cooling turbo fan 31 is for forcibly sending the cooling air primarily cooled and humidified by the underground heat exchange device 1 into the semen chamber 42 through the cooling device 32, that is, The forced cooling turbo fan 31 and the cooling device 32 are connected via the ventilation path 22.
The air supply amount of the forced cooling turbo fan 31 is not particularly limited, but preferably has an air supply amount of 1.5 t or more per minute, for example.

  The cooling device 32 is for forcibly performing secondary cooling of the cooling air that has been primarily cooled and humidified by the underground heat exchange device 1, and there is no particular limitation on the cooling method, and the air cooling type Or water-cooled type. In addition, if it is an air-cooling type, it can be considered to use a general household or commercial air conditioner as it is to cool the air supply. Moreover, if it is a water-cooling type, it is possible to use the ground water which can be stably obtained at about 14-17 degreeC also in summer as a cold water to be used, or to use about 20 degreeC tap water. At this time, the cold water can be poured as it is to be used for cooling the air supply, or a mode in which a water-cooled radiator generally used in automobiles or the like is used almost as is can be considered.

  The rice milling machine 40 includes a brown rice hopper 41 into which brown rice is charged, a milling chamber 42, and a white rice discharge port 48. The milling chamber 42 includes a milling roll 44 that is rotated by a motor 49 in a wire mesh cylinder 43 made of a mesh smaller than rice grains. The fine roll 44 is a hollow shaft type, and has a structure having a vent hole 46 on the roll surface 45.

  The hollow shaft base end portion 47 of the fine roll 44 is connected to the cooling device 32 through the ventilation path 22, and the cooling air that is secondarily cooled by the cooling device 32 is the roll surface of the fine roll 44. The air is fed into the semen chamber 42 through the vent hole 46 provided in 45.

The koji suction fan 50 is for sucking rice koji generated in the milling process, and is connected to the koji milling chamber 42 via a feeding path 52. In addition, since the suction | attraction | suction suction fan 50 depressurizes the inside of the semen chamber 42 by the suction action, it will also act so that the said cooling air may be drawn in the semen chamber 42.
The suction amount of the soot suction fan 50 is not particularly limited, but is, for example, about 0.5 t / min.
The soot suction fan 50 and the soot chamber 51 are connected via a feed path 52, and the rice cake sucked by the soot suction fan 50 is sent to the soot chamber 51 via the feed path 52. .

  Regarding the brown rice milling process by the rice mill 40, the brown rice is guided from the brown rice hopper 41 into the wire mesh cylinder 43 of the milling chamber 42, and the milled roll 44 is rotated by the motor 49 in the wire mesh cylinder 43, thereby Sperm is performed. The white rice produced by the milling of the brown rice is discharged from the white rice outlet 48, and the generated rice bran passes through the mesh of the wire mesh cylinder 43 and is sucked by the rice bran suction fan 50 and sent to the rice bran chamber 51.

  By the way, in the rice milling apparatus according to the present invention configured as described above, as shown in the drawings, it is desirable to have an aspect including an exhaust fan 60 for discharging hot air accumulated in the rice milling chamber 30.

About the rice polishing apparatus concerning this invention comprised as mentioned above, the effect is demonstrated below.
For example, outdoor air having a high summer temperature is sucked from the outside air inlet 20 by the action of the forced cooling turbo fan 31, and then passes through the zigzag ventilation path 12 of the perforated concrete block 10 in the underground heat exchanger 1. Then, it is cooled to about 20 ° C. and is humidified to about 70 to 80% (primary cooling).
The primarily cooled cooling air is guided to the forced cooling turbo fan 31 and the cooling device 32 through the ventilation path 22. In the cooling device 32, the cooling air subjected to the primary cooling is further forcibly cooled, and specifically, is cooled to about 5 to 10 ° C. (secondary cooling).

  The secondary cooled cooling air is guided to the hollow shaft of the fine roll 44 through the ventilation path 22 by the combined action of the air feeding action by the forced cooling turbo fan 31 and the suction action by the fine suction fan 50, and the fine roll 44 Cooling air enters into the semen chamber 42 from the air holes 46 provided in the roll surface 45. As a result, the roll surface 45 of the milling roll 44 that generates frictional heat by milling is cooled, and the entire milling chamber 42 is also cooled. At this time, the temperature of the roll surface 45 slightly rises due to frictional heat, but white rice does not exceed 38 ° C. at the maximum even in summer. For this reason, the quality of rice does not change at all.

  By the way, although the moisture content of the brown rice thrown into the milling room 42 is about 14.5%, the conventional rice milling process increases to 60 ° C. at the time of milling, so that high temperature In order to lower the white rice to room temperature (about 30 ° C.), shade drying (natural cooling) is generally performed. By performing this shade drying, the white rice is dried and the water content is reduced to 11% or less. This is a so-called “over-drying” state. When the rice is over-dried, the taste of the rice is greatly reduced.

  On the other hand, according to the rice milling apparatus according to the present invention, the temperature during milling does not exceed a maximum of 38 ° C., so there is no need to dry the white rice after milling at all, and the moisture content is 14.5% of brown rice Is maintained as it is. For this reason, there is an advantage that the original taste is maintained without white rice becoming overdried.

  The rice milling apparatus according to the present invention is secondarily cooled by the cooling device 32 and the cooling air primarily cooled and humidified by the underground heat exchange device 1 by the cooperative action of the forced cooling turbo fan 31 and the straw suction fan 50. By adopting a configuration in which the cooled air is supplied to the semen roll 44, it contributes to the reduction of the mechanical burden for supplying air, and it is possible to supply a large amount of cooling air, so that the cooling efficiency can be improved. This contributes to improvement, and as a result, it is possible to provide more delicious white rice without temperature change, and it is considered that the industrial applicability of the rice milling apparatus according to the present invention is extremely high.

DESCRIPTION OF SYMBOLS 1 Underground heat exchange apparatus 10 Perforated concrete block 11 Concrete groove formation concrete goods 12 Spiral folding ventilation path 20 Outside air inlet 22 Ventilation path 30 Rice mill 31 Forced cooling turbofan 32 Cooling apparatus 40 Rice mill 41 Brown rice hopper 42 Brown rice mill 43 Wire net Tube 44 Milling roll 45 Roll surface 46 Vent hole 47 Hollow shaft base end 48 White rice outlet 49 Motor 50 Suction fan 51 Saddle chamber 52 Feeding path 60 Exhaust fan

Claims (1)

A rice milling device comprising a ground heat exchange device and a rice milling room,
The underground heat exchange device embeds a plurality of perforated concrete blocks so that the holes are connected in a zigzag manner and a zigzag ventilation path is formed from one end to the other end, and is embedded underground. One end of the zigzag folding air passage is connected to the outside air inlet through the air passage, and the other end is connected to the forced cooling turbofan in the rice milling chamber through the air passage,
The rice milling chamber includes a forced cooling turbo fan, a cooling device, a rice mill, a straw suction fan, and a straw chamber, and the forced cooling turbo fan and the cooling device are connected via an air passage, The cooling device and the hollow shaft base end portion of the hollow shaft type milling roll having a vent on the roll surface mounted in the milling chamber of the rice mill are connected through a ventilation path, and the milling chamber and the mill of the rice mill are further connected. A suction fan is connected via a feeding path, and a suction fan and a cage are connected via a feeding path,
By the combined action of the forced cooling turbo fan and the soot suction fan, the cooling air primarily cooled and humidified by the underground heat exchange device and the cooling air secondary cooled by the cooling device are sent to the scouring roll. The rice milling apparatus is characterized in that the rice milling chamber is cooled to perform low-temperature rice milling.

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