JP2000176299A - Rice facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return grains remaining in a grain feeding tank and in a grain conveying route to the operation room side by a simple work, and as much grains as possible when polishing work is finished halfway owing to circumstances such as stoppage of the polishing work due to an overload of a rice polishing device in a rice polishing facility having a grain feeding tank for a worker to feed grains, an operation room provided with an operation panel for setting the polishing degree, a rice polishing device, and a grain conveying route for conveying grains to the rice polishing device. SOLUTION: In this rice polishing facility having a raw material feeding tank for an worker to feed grains, an operation room provided with an operation panel for setting the polishing degree, a rice polishing device, and a grain conveying route for conveying the grains to the rice polishing device, in the grain conveying route 6, a return route 70 for returning the grains fed into the raw material feeding tank to the operation room side is connected, and also a switching means 76 for switching the grain conveying route 6 to the return path side is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling facility having a milling device in a building.

[0002]

2. Description of the Related Art Conventionally, an operation room side provided with a grain input tank for inputting grains, an operation panel for inputting a fee and setting a degree of milling, etc., an elevator for transporting the grains, a rice milling apparatus, and the like. There is known a building-type rice milling facility that is divided into a machine room equipped with the above.

[0003]

In the above-described rice milling facilities, during the milling operation, the rice milling equipment is stopped due to the overload of the rice milling equipment, the protection device such as a breaker or a thermal relay being dropped, Alternatively, there may be a case where the polishing operation cannot be continued because the fee is lost in a state where the kernel remains in the kernel charging tank during the polishing operation. In such a case, since unrefined grains remain in the grain input tank and the grain transport path, it is necessary for the operator to remove these remaining grains.

[0004] However, in order to take out the residual kernel from the grain input tank, it is necessary for an operator to put his hand into the grain tank and scrape it out, which is troublesome for the operator and also requires a lower portion of the grain input tank. There are certain rotary valves and spirals that are dangerous. Further, the kernel remaining in the kernel transport path is in the machine room separated from the operation room by the partition wall, and cannot be taken out from the operation room.

SUMMARY OF THE INVENTION [0005] The present invention is to provide a method for easily refining a grain remaining in a grain input tank and a grain transport path, and returning more unpolished grain to a worker when the refining work is interrupted due to various circumstances. With the goal. It is another object of the present invention to enable the grains to be returned to the operation room even if the rice mill is stopped due to the operation of the overload protection device. Furthermore, when taking out the reduced grains in the operation room, it is another object of the present invention to make it possible to directly carry the grains into the grain bag or the like brought and to improve the workability when carrying the grains into the grain bag.

[0006]

The present invention employs the following technical means to achieve the above object. That is, in claim 1, an operation room provided with a grain input tank into which the operator inputs the grain, and an operation panel for setting the degree of milling, etc., and the grain input by the operator into the grain input tank is refined. In a milling facility comprising a milling device for processing, and a machine room having a grain transport path for transporting the grains charged to the grain input tank to the rice milling device, the grain transport path includes a grain input tank. A rice mill is characterized by connecting a reduction passage for reducing the introduced grains to the operation room side and providing a switching means for switching a grain transport path on the reduction passage side.

[0007] In claim 2, the grain conveying path,
The driving means for driving the switching means uses a power source of a different system from the driving means of the rice milling apparatus. 4. The method according to claim 3, wherein the operation room includes a white rice tank for taking out the polished rice subjected to the whitening operation, and a grain return port connected to an end side of the reduction passage. The mouth is installed at substantially the same height as the lower end of the white rice tank.

According to a fourth aspect of the present invention, the operating means for operating the switching means is provided on the operation room side, wherein the switching means does not operate even if the grain return button is operated during the milling process. Claims 1 to 3 characterized in that:
Either one of the rice milling facilities described.

[0009]

When the worker puts the grains in a bag or the like brought into a grain feeding tank, the grains pass through a predetermined grain transport path, are supplied to a rice milling machine, and have the desired whiteness. A refining operation according to the degree is performed. When the grains remaining in the grain input tank in a small amount are reduced as unmilled grains without being subjected to the milling treatment, the switching means is operated to operate the grain transfer path from the grain transport path through the reduction passage to the operation room. Can be reduced to the side. At this time, the grains in the grain transport path can be taken out at the same time, so that more grains can be returned to the worker and the next worker's input grain is prevented from being mixed. it can.

[0010] When the rice milling apparatus is stopped by the operation of the overload prevention device during the milling operation to reduce the residual unmilled grains in the grain charging tank, the grain transport path and the switching means are provided with: Because it is connected to a power supply of a different system from the rice mill,
By independently driving, residual grains can be reduced. Further, by setting the grain return port at substantially the same height as the lower end of the white rice tank, the operator can carry the reduced grain into the bag as if taking out the white rice into the grain bag.

[0011] In addition, during the milling process of the rice mill,
Even if the operator operates the grain return button, the switching means does not operate, so that it is possible to prevent the reduction of unrefined grains due to an erroneous operation of the operator.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an internal configuration of a building viewed from the plane of a rice milling facility.
And machine room B. In the operation room A, a grain bag holder 2, an operation panel 3, a white rice tank 4 and the like are provided.
With the input port of the raw material input tank 5 facing the machine room B side,
A lifting device 6 for a stone removal device, a stone removal device 7, a foreign matter removing device 8, a lifting device 9 for a rice milling device, a rice bran treating section 10, a rice milling device 11, and the like are provided.

FIG. 2 is a view showing the working process of the rice milling facility in the embodiment. A grain detection sensor 5a for detecting the presence or absence of the grain charged in the ingredient charging tank 5 is provided below the ingredient charging tank 5. A rotary valve 13 is provided as a means for feeding out the grains charged into the raw material charging tank 5, and the delivery side of the rotary valve 13 is connected to a hopper 6 of a lifting device 6 for a stone removing device.
a. One end of each of the reduction passage 70 and the stone removal passage 6 c is connected to the discharge port 6 b of the stone removal device elevator 6, and the other end of the stone removal passage 6 c faces the input port side of the stone removal device 7. I do.

As shown in FIG. 3, the stone removing device 7 has an oscillating sorting plate 7a which is arranged at an angle, and a blower fan 7b which is arranged below the swingable sorter plate 7a. With a well-known configuration that passes through a number of holes (not shown) provided in the swing sorting plate 7a, power is transmitted from a drive motor 7c for the stone removal device, and the swing sorting plate 7a and the blowing fan 7
b is configured to be driven. And the swing sorting plate 7
A stone discharge port 7d is provided on the rocking side of a, a stone discharging shot opening 7e is facing on the rocking side, and a stone storage chamber 7f for storing sorted stones is provided below the stone removing device 7. Built-in.
Then, the grain discharge port 7d faces the supply unit C of the foreign matter removing device 8 that removes foreign matter such as straw waste. At this time, the grain discharge port 7d of the stone removal device 7 is provided above one side of the supply section C of the foreign matter removing device 8. Then, one end of the transfer hose 8c is connected to the grain discharge cylinder 44 of the foreign matter removing device 8 and the other end is exposed to the hopper 9a of the rice mill elevating machine 9, and the foreign matter is removed from the stone removing device 7 in plan view. The grain path from the removal device 8 to the rice mill elevating machine 9 is formed so as to have a "<" shape. The outlet 9b of the rice-milling elevator 9 is configured to face the brown rice tank 14, and the rice-milling device 11 is disposed below the outlet 9b.

Now, as shown in FIG. 4, the rice milling apparatus 11 has a platinum roll 11a and a milling roll 11b,
1c is a well-known form in which a drive shaft 11d is mounted and rotated. A space is formed inside the drive shaft 11d so that the air from the bran blowing fan 11e passes therethrough.

Further, the grain discharge port side 11 of the rice mill 11
At f, a compression plate 11g is arranged, and faces the white rice tank 4 from which the white rice is taken out. A white rice take-out shutter 4a is provided at the lower end of the white rice tank 4, and a tread plate 4b is further provided below the white rice take-out shutter 4a.
and b are connected by a rod 4c. The rotation of the tread plate 4b and the opening and closing of the white rice take-out shutter 4a are interlocked.

A bran storage hopper 11h for storing the bran generated during the milling operation is disposed below the rice milling device 11, and a bran transport fan 11k and a bran transport path 15 are provided from the lower end of the bran storage hopper 11h. Cyclone 10a of processing unit 10
It is configured to communicate with. The bran processing unit 10 includes a cyclone 10a, a bran spiral 10b for horizontally transporting the bran dropped from the cyclone 10a, a bran transport gutter 10c containing the bran spiral 10b, and a bran bag 10d discharged from the bran transport gutter 10c.
10d.

Reference numeral 19 denotes a rice bran switching valve, which can switch the transport path so that the rice can be transported to the rice processing unit 10 side and the operation room A side, respectively. Operation room A via a fall tube (not shown)
To the take-out section 18 on the side. Next, the foreign matter removing device 8 will be described with reference to FIGS. Foreign matter removal device 8
The inside of the machine body is provided with a supply section C for receiving the grain discharged from the grain discharge port 7d of the stoning device 7, a sorting plate 40 for separating and separating the grain and foreign matter such as straw, and the selected grain. A sorting unit D composed of a conveyer plate 41 or the like to be conveyed, a support 42 supporting the sorting unit D, a driving unit E for making the sorting unit D and the support 42 circularly move, and a sorting terminal side of the sorting unit D And a discharge section F including a grain discharge cylinder 44 and a foreign matter discharge cylinder 45.

First, the supply section C will be described. Reference numeral 46 denotes a supply hopper for storing the grains discharged from the grain discharge port 7d of the destoner 7, and a grain supply port 46a is provided at the lower end of the supply hopper 46. And the side of the feed hopper 46 is
A buffer hole 47 is formed. Next, the structure of the sorting section D will be described. The sorting plate 40 is disposed below the supply hopper 46 obliquely downward toward the sorting end side. At this time, the sorting / transporting direction z of the sorting plate 40 is disposed so as to be substantially orthogonal to the sorting / transporting direction y of the swing sorting plate 7a of the stone removing device 7. FIG. 10 is a view showing the surface of the sorting plate 40. The sorting starting end side is the receiving plate portion 40a, and the kernel from the grain supply port of the supply hopper 46 is supplied to the region 40b substantially in the center of the receiving plate portion 40a. And a diffusion plate 4 for diffusing the supplied grains to the entire surface of the sorting plate in the vicinity of the region.
0d is provided. From the receiving plate portion 40a, a porous surface 40f provided with a large number of holes 40c such that grains can pass therethrough is extended in the sorting and conveying direction z, and the sorting end side of the sorting plate 40 is a transfer plate 40e. Is formed. In addition, a falling plate 41 is provided obliquely downward and similar to the sorting plate 40 below, and the side surfaces of the falling plate 41 and the sorting plate 40 are integrally formed by the same sorting plate frame 48. In addition, the grain falling cylinder 44 is arranged downward from the end side of the flowing grain board 41, and a partition plate 49 is fixed to the grain falling cylinder 44,
Further below this is a grain discharge cylinder 44 and a foreign matter discharge cylinder 45.
Are arranged respectively.

Next, the support member 42 will be described. The support member 42 is disposed so as to cover the lower part of the selection part D, and the selection part D is provided with two screws 50 on each of the left and right sides.
It is linked to The screws 50, 50 are for adjusting the inclination angle of the sorting portion D. The screws 50, 50 are formed so as to be slidable up and down along the long holes 51, 51 so that the sorting portion D with respect to the support 42 can be adjusted. The relative tilt angle can be adjusted.

A support plate 52 protruding from one of the left and right side surfaces of one end of the support member 42 has a spring 53, one of which is engaged with the body of the foreign matter removing device 8, respectively. The support member 54 from the machine body is mounted on a wheel 55 rotatable in the sorting / conveying direction z.
Is configured to be mounted. Further, the distal end of the shaft 56 projecting below the lower surface of the support 42 is connected to the long hole 5 provided in the body.
7

Next, the drive unit E will be described. A motor 31 has a boss portion 59 fitted at the end of a motor shaft 31a, and the boss portion 59 has a vertical axis center position. A rotating shaft 60 different from the shaft 31a is fitted. And the rotating shaft 60
The bearing 61 penetrates the bottom of the upper support 42 and the bearings 61 are fitted to the rotary shaft from above and below the support 42. The position where the rotating shaft 60 passes through the support 42 is located below the porous surface 40f of the sorting plate 40.

Next, the operation of the foreign matter removing device 8 will be described. When the motor 31 starts driving and the motor shaft 31a rotates, the motor rotates while the rotating shaft 60 rotates. It rotates around the axis 31a. Then, the support 42, the sorting plate 40, and the sorting end side of the flocking board 41 make a circular motion (a). On the other hand, the sorting start end moves back and forth (b) in the sorting and conveying direction z as the shaft 56 extends along the long hole 57. At this time, the spring 53 prevents the sorting portion D from swinging up and down to prevent the grains on the sorting plate 40 from splashing and scattering from the sorting plate frame 48, and also prevents the foreign matter removing device 8 itself from vibrating. are doing. The wheel 55 supports the sorting section D from below, and is interlocked with the forward and backward movement (b) of the sorting section D on the sorting start end side.

Next, as shown in FIG. 5, a coin mech 20, a sticky selection button 21, and a whiteness selection button 22, 22, 22 (in this embodiment, upper white, standard, (3/8 steps can be selected), charge table 23, grain return button 71, and the like. And this operation panel 3
Is provided with a control unit 24 based on a sequence for controlling the driving of each unit driving motor.

As shown in the block diagram of FIG. 6, the control unit 24 includes detection information from the coin sensor 25, whiteness selection information from the whiteness selection buttons 22, 22, and selection information from the rice cake selection button 21. Is input. On the other hand,
Control signal to tally valve drive motor 26,
Control signals to the elevator drive motor 27 for the rice milling device, the stone removal device drive motor 7c, the rice milling device drive motor 28, the whiteness adjustment motor 29, the bran spiral drive motor 30, the foreign matter removing device. , The reduction switching valve drive motor 76, etc. are output.

Reference numeral 71 denotes a grain return button, which will be described later. The input information from the grain return button is not passed through the control unit, and the reduction switching valve drive motor 76, the rotary valve drive motor 26, and the elevator / rice milling device for the destoning device Input can be made directly to the elevator drive motor 27. FIG. 7 is a wiring diagram of a rice milling facility.
4a and 74b, and the power supply 74a is 200V
And the power supply 74b uses 100V. Wiring is connected to each part of the apparatus from the power supplies 74a and 74b, but various buttons on the operation panel 3, the control unit 24, and a crusher / rice miller for transferring grains to the rice milling apparatus 11 from the 100V power supply 74b. The device elevator 27, the reduction switching valve drive motor 72, and the like are connected, and a 200V power supply 74a
Is connected to a rice milling device 11 or the like. Note that R1 to R
Reference numeral 8 denotes a relay for turning ON / OFF each section of the apparatus, which is operated by an opening / closing command from the control section 24, and operates to stop the operation of each section of the apparatus. Here, the power supplies of different systems indicate power supplies of two different systems, and the two power supplies may use the same voltage as 200V.

Next, a description will be given of the configuration of the reduction passage 70 and the operation method of the switching means for switching the flow of the kernel from the kernel conveyance route to the reduction passage 70, which are essential parts of the present invention. FIG. 13 shows FIG.
2 is a cross-sectional view taken along line PP-II of FIG. 1. As described above, two passages are connected to the discharge port 6b of the elevator 6 for the stone removal facility. Reference numeral 6c denotes an excavating passage, which is an elevator 6 for excavating equipment.
Between the discharge port 6b and the stone removal device 7. Reference numeral 70 denotes a return passage, which is a discharge port 6 of the lift 6 for the stone removal device.
b and the grain return port 75 provided on the operation room A side are communicated through the partition wall 1. A reduction switching valve 72 is provided in a portion where the two passages are connected (see FIG. 14), and is switched by a reduction switching valve drive motor 76 to be connected to the stone removal passage 6c or the reduction passage 70. Are configured to be open.

The grain return port 75 has a configuration in which the tip is open to the operation room side, and has a height substantially equal to that of the white rice take-out shutter 4a at the lower end of the white rice tank 4 as shown in FIG. Is provided. By the way, when the grains in the raw material charging tank 5 are returned to the grain return port 75, when the grain return button 71 is pressed, an operation command is issued to the reduction switching valve drive motor 76, and the reduction switching valve 70 is The reduction passage side 70 is opened by blocking the stone removal passage 6c side. Then, an operation command is also issued to the rotary valve 13 and the lifting device 6 for the destoning device, and they are respectively operated, and the grain is discharged from the outlet 6 of the lifting device 6 for the destoning device.
b, is returned to the grain return port 75 through the return passage 70, and is discharged to the operation room A side.

During the milling operation, the grain return button 71 is not operated even if the grain return button 71 is pressed, so that the unmilled rice is not returned due to an erroneous operation of the operator during the milling operation. I have to. Next, the working process of the rice milling facility will be described with reference to FIGS. The operator stands in the operation room A, and inserts coins into the insertion slot of the coin mech 20 so as to secure the operation time corresponding to the grain amount. When the grains are put in the grain bag, the bags are placed on the bag holder 2, and then the grains serving as the raw materials are charged into the input port of the raw material charging tank 5. Next, select whiteness button 2
When one of 2.22 and 22 is selected and the degree of whitening is set, the whiteness adjusting motor 29 operates to set the position of the compression plate 11g. When these setting preparations are completed and the grain detection sensor 5a detects the presence of a grain, the control unit 24 reads the number of inserted coins, calculates an operation time, and the respective units of the rice milling facility operate during the calculation time. To start.

The grains charged in the raw material charging tank 5 are ro
The liquid is supplied to the lifting device 6 for the destoning device by the tally valve 13, the grain is lifted by the lifting device 6 for the destoning device, and is dropped into the destoning device 7. The grains dropped and thrown into the stone removal device 7 are oscillating sorting plates 7a.
The grain is supplied to the upper side of the table. In the meantime, by the swinging operation of the swinging selection plate 7a and the blowing from the blowing fan 7b,
Pebbles, foreign matter, and the like in the grains are sorted and conveyed upward, and are stored in a stone storage chamber 7f via a stone discharge shot 7e. on the other hand,
The grain flows down to the swinging side of the swing sorting plate 7a, and the grain discharge port 7
From d, it is dropped and supplied to the supply hopper 46 of the foreign matter removing device 8.

The grains supplied to the supply hopper 46 of the foreign matter removing device 8 are supplied from a supply port of the supply hopper 46 to an area in the receiving plate portion 40a of the sorting plate 40. As described above, the grains are conveyed to the perforated surface 40f by the fore-and-aft movement (b) on the sorting start end side, and the V-shaped diffusion plate 40d causes the grains supplied to the receiving plate portion 40a to move left and right. Although the divergence occurs, the grains are diffused to substantially the entirety of the sorting plate 40 by the action of the circular motion (a) on the lower side of the sorting plate surface, and the grains fall into the flowing grain plate 41 from the holes 40c, and It flows down to the grain falling cylinder 44. The hopper 9a of the rice-milling elevator 9 falls from the grain discharge cylinder 44 and passes through the transfer hose 8c.
, And then is fried by a mill for a rice mill, and is dropped and supplied to a brown rice tank 14.

On the other hand, straw waste and the like that cannot pass through the hole 40c are conveyed with the perforated surface 40f of the sorting plate 40 and the conveying plate 40e inclined downward.
Is discharged from the foreign matter discharge cylinder 45 to the foreign matter storage chamber (not shown) without being mixed into the liquid. The grains supplied to the brown rice tank 14 are supplied to the rice milling device 11 and
The whitening action is performed so that the whitening degree is set between b and the fine platinum net 11a. The milled white rice is temporarily stored in the milled rice tank 4 through the grain discharge port, and when the worker spreads the grain bag below the milled rice tank and steps on the tread plate 4c, the open / close shutter is opened, and the milled rice is opened. Is collected in grain bags.

The bran and the like generated during the whitening operation are discharged to a bran storage hopper 11h, and the bran transport fan 11k sucks and removes the bran.
By the blowing action, the bran processing unit 10 passes through the bran transport path 15.
, And is collected in the bran bags 10d via the cyclone 10a and the bran spiral 10b. Alternatively, when switching is performed by the switching valve 19, the fluid is taken out through the cyclone 16 at the take-out part 18 on the operation room A side.

When the time set by the amount of money elapses,
Each device in the milling facility stops. by the way,
When the rice mill 11 is overloaded, or the other parts of the rice mill are out of order due to a failure or the like, or the rice mill 11 stops operating after the predetermined time for the fee has elapsed and the rice mill 11 and other parts of the rice mill have stopped. When the worker wants to return the raw material grains without further refining work, such as when a small amount of the kernel remains in the raw material input tank 5 and the lifting device 6 for the stone removal device, a grain return button is used. When the switch 71 is pressed, the reduction switching valve drive motor 76 is driven, and the reduction switching valve 72 closes the stone removal passage 6c and opens the reduction passage 70. Then, the rotary valve 13 and the elevator 6 for the stone removal device for a predetermined time
Is driven, and the grains remaining in the raw material input tank 5 are returned to the grain return port 75 through the lifting device 6 for the stone removal device and the reduction passage 70. At this time, the worker puts the grains discharged from the grain return port 75 into a grain bag or the like brought.

According to this embodiment, the input fee is eliminated,
The grains remaining in the raw material charging tank 5 in a small amount can be returned to the operation room by operating the switching means. At this time, the grains in the destoner 6 can be taken out at the same time, so that more grains can be returned to the worker and mixed with the next worker's grain. Can be prevented.

In this embodiment, the elevator 6 for the stone removal device is used.
The discharge passage 6b communicates with the discharge passage 6b. However, if the discharge passage 9b communicates with the discharge port 9b of the lift 9 for the rice milling machine, the grain reaching the elevator 6 for the stone milling device, the stone milling device, and the elevator 9 for the rice milling machine. It goes without saying that the residual grains in the grain transport path can also be reduced. Also, when the protection device such as the thermal relay of the power supply 74a is activated due to the overload of the rice polishing apparatus 11, the rotary valve 13, the reduction switching valve drive motor, and the lifting device 6 for the stone removal device are connected to the 100V power supply 74b of the different system. Connected, can be driven independently, and can reduce residual kernels.

The grains passing through the return passage 70 are supplied to the operation room A
By installing the grain return port 75 returned to the side at substantially the same height as the lower end of the white rice tank 4, the operator carries the reduced rice into the bag as if taking out the white rice into the grain bag. be able to. Further, even if the operator presses the grain return button 71 by mistake during the refining operation, the reduction switching valve drive motor 76 does not operate, and the reduction switching valve blocks the stone removal passage 6c to remove unrefined grains. The flow into the reduction passage 70 can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing each part of an apparatus in a rice polishing facility viewed from a plane.

Fig. 2 Work process diagram of rice mill

FIG. 3 is a cross-sectional view of a stone removing device.

FIG. 4 is a sectional view of a rice milling machine.

FIG. 5 is an operation panel diagram.

FIG. 6 is a block diagram.

FIG. 7 is a wiring diagram

FIG. 8 is a side view of a foreign matter removing device.

FIG. 9 is a plan view of a foreign matter removing device as viewed from above.

FIG. 10 is a front view of a foreign matter removing device.

FIG. 11 is a sorting plate of the foreign matter removing device.

FIG. 12 is a flowchart.

FIG. 13 is a cross-sectional view of the rice milling facility viewed from the side (PP 側面).

FIG. 14 is a diagram showing a main part of the invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Partition wall, 3 ... Operation panel, 4 ... White rice tank, 4a ... White rice removal shutter, 5 ... Raw material charging tank, 6 ... Elevator for stone removal device, 6c ... Stone removal passage, 9 ... Elevator for rice milling device,
70: return passage, 71: grain return button, 72: return switching valve, 74a: power supply (200V), 74b: power supply (10
0V), 75: grain return port, 76: reduction switching valve drive motor, A: operation room, B: machine room, R1 to R8: relay

Claims (4)

[Claims] An operation room including a grain input tank into which an operator inputs grains, and an operation panel for setting a degree of milling and the like,
In a rice milling facility comprising a rice milling machine that performs whitening processing of grains put into a grain feeding tank by a worker, and a machine room having a grain transfer path for feeding the grains thrown into the grain feeding tank to the rice milling machine. In the kernel transport path, while connecting a reduction passage for reducing the kernels charged to the kernel input tank to the operation room side, switching means for switching the kernel transport path on the reduction passage side is provided, Rice mill to do. 2. The rice milling facility according to claim 1, wherein the driving means for driving the grain conveying path and the switching means uses a power source of a different system from the driving means of the rice milling apparatus. 3. The operation room side further includes a white rice tank for taking out the polished rice subjected to the whitening operation, and a grain return port connected to an end side of the reduction passage, wherein the grain return port is provided. The rice mill according to claim 1 or 2, wherein the rice is installed at substantially the same height as the lower end of the white rice tank. 4. A method in which a grain return button for operating the switching means is provided on the operation room side, wherein the switching means does not operate even if the grain return button is operated during the milling process of the rice milling machine. The rice milling facility according to any one of claims 1 to 3.