JP2000218173A - Rice mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce damage irrespectively of the difficulty of bran peeling in a rice mill for peeling off the surface bran layers of grains. SOLUTION: Polishing rolls which receive brown rice into a polishing chamber for polishing are rotated. A standard pressure polishing chamber 22a which obtains a standard polishing pressure is formed close to the brown rice receiving port in the polishing chamber, while a low pressure polishing chamber 22b is formed close to the outlet, the polishing rolls 32a of the chamber 22a and the polishing rolls 23b of the chamber 22b are rotated interlockingly at different numbers of revolution, or the volume per unit length of the chamber 22b is made larger than that of the chamber 22a. Brown rice is introduced into the chamber 22a, the surface bran layers are peeled off between the grains or between bran removing screens 32 by the rolls 23a, and the brown rice is polished. Next, the grains are introduced into the chamber 22b to be subjected to final finishing at a polishing pressure to prevent the damage of the grains with a bran peeling pressure reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice milling apparatus for stripping a surface bran layer of a grain.

[0002]

2. Description of the Related Art A refining roll is driven to rotate in a refining chamber, and the refining chamber is raised to a predetermined refining pressure to form a refining chamber. The bran layer on the surface is removed. By the way, the refining pressure in the refining chamber is based on the adjustment of the resilience of the compression plate on the outlet side. However, once the refining pressure of the grain from the supply unit to the outlet is set, it is determined before and after the refining roll. It is determined almost uniformly. In addition, the part which is easily subjected to the peeling action is mainly implemented in a predetermined range near the brown rice receiving port. For this reason, there is a disadvantage that the granules, which are relatively easy to peel off the bran, are crushed at the outlet side by pressurization.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has taken the following technical means. That is, in a milling apparatus provided to rotate and drive a milling roll for receiving and milling brown rice in a milling chamber, a standard pressure milling chamber for obtaining a standard milling pressure is provided on the side near the brown rice receiving port in the milling chamber, and on the side near the outlet. Is a rice milling machine in which a low-pressure milling chamber is formed. Here, the whitening roll of the standard-pressure whitening chamber and the whitening roll of the low-pressure whitening chamber may be rotated and linked at different rotation speeds, or the volume per unit length of the standard-pressure whitening chamber, May be configured to have a large volume.

Further, the outlet side of the refining roll is formed in a frustoconical shape, and the periphery of the refining chamber is provided substantially along the conical shape.
In addition, a rice mill is provided in which a milling roll is provided so as to be movable in the direction of the rotation axis.

[0005]

As described above, a standard pressure whitening chamber for obtaining standard whitening pressure is formed near the brown rice receiving port in the whitening chamber, and a low pressure whitening chamber is formed near the outlet. The brown rice which flows down into the 12 whitening chambers 22 first enters the standard pressure whitening chamber 22a, and the surface bran layer is peeled off between the grains and between the bran removing screens 32 by the rotation of the whitening roll 23a to be whitened. Next, the process goes to the low-pressure refining chamber 22b, where,
The pressure for peeling the bran is alleviated, and the grain is subjected to reasonable whitening pressure to perform the final finishing. Therefore, even if it is applied to brown rice of varieties that are easy to peel off bran, irreversible whitening pressure is not applied to grains in the white rice state, the number of damaged grains is reduced, while brown rice of varieties that are difficult to remove bran is conventionally used in low pressure milling room. As a result, the rice can be sufficiently polished and can handle a variety of brown rice.

The standard pressure refining chamber 22a and the low pressure refining chamber 22b can be implemented based on the difference in volume per unit length of the refining chamber or the difference in the number of revolutions of the refining roll 23a or 23b. In the embodiment where both are implemented,
There is an effect that the process length of the low pressure refining chamber can be set short. Further, when the outlet side of the polishing roll is formed in a frusto-conical shape, the volume of the space occupied by the grains can be easily changed, and thus the change in the polishing pressure can be easily adjusted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a building in which an unmanned rice mill is installed. The inside of the building is partitioned into an operation room 3 and a machine room 4 by a partition wall 2. The operation room 3 has a brown rice input unit 5, an operation panel 6, a white rice extraction unit 7, and the like, and the machine room 3 has an input hopper 8, a stone removal machine 9, a stone removal machine 10, a rice milling machine 11, It has a rice mill 12, a bran processing unit 13, and the like.

[0008] The brown rice charging section 5 is provided with an opening 1 of the partition wall 2.
Before and after 4, a brown rice table 15 is arranged on the operation room 3 side, and a charging hopper 8 is arranged on the machine room 4 side. A supply gutter 17 as brown rice supply means is provided below the hopper 8. The shaft of a supply spiral (not shown) provided inside the supply gutter 17 is provided so as to be able to rotate and interlock with a drive motor (not shown) on one end side.

The transfer end of the supply gutter 17 is viewed from the hopper of the stone removal elevator 9, and the stone removal machine 10 is positioned below the upper hopper of the stone removal elevator 9. The crusher 10 comprises a tilting sorting machine, a fan, a swinging mechanism, etc., and the sorting machine swings in the tilting direction due to the rotation of the driving motor to generate wind and mix foreign matter (stone, metal) in brown rice. Flakes) are swung upward on the inclined side, and the brown rice is caused to flow downward and to be discharged from the outlet 20. Below the outlet 20, a foreign matter sorting board 19 for separating and removing long foreign matter and the like is viewed.

The hopper of the rice mill 11 is connected to the brown rice outlet 2 described above.
0, and the brown rice tank 21 of the rice mill 12 is looked down at the upper tank lower part. The milling machine 12 has a form in which a milling roll 23 is provided in a milling chamber 22. The milling chamber 22 is formed into a standard-pressure milling chamber 22a near the brown rice receiving port and a low-pressure milling chamber 22b near the milled rice outlet. You. That is,
The difference between the standard pressure and the low pressure is that the cross-sectional area of the low-pressure whitening chamber 22b is wider than the cross-sectional area of the standard-pressure whitening chamber 22a, that is, the unit area per unit length of the standard-pressure whitening chamber 22a. The volume of the low-pressure refining chamber 22b is configured to be larger than the volume.

The refining roll 23 is provided in the standard pressure refining chamber 2.
The whitening roll 23a provided on the 2a side and the whitening roll 23b provided in the low-pressure whitening chamber are independently provided. That is, these whitening rolls 23a and 23b are provided on the inner and outer double transmission shafts 24a and 24b, respectively. The transmission shaft 24a is interlocked with a rice polishing machine motor 26 via a small-diameter driven pulley 25a, and a milling roll 23a via a grain feeding spiral 27 in the middle.
Is linked to the rotation. The transmission shaft 24b is installed inside the transmission shaft 24a, has a large-diameter driven pulley 25b, and is configured to rotate at a lower speed than the refining roll 23a and rotate the refining roll 23b.

The rice milling motor 26 is configured to drive the transmission shafts 24a and 24b by driving pulleys 27, 27 of the same diameter, and to rotate the rice bran conveying fan and the like in rotation.
On the exit side of the low-pressure whitening chamber 22b, a compression plate 28 is provided,
The spring pressure can be adjusted by the forward, neutral, and reverse rotations of the whiteness adjusting motor 29, and can be set in three stages: white, standard, and eight minutes. The outlet communicates with a white rice tank 30 as a white rice extraction section 7.

The standard pressure refining chamber 22a and the low pressure refining chamber 2
The bran separated from the bran removing screen 32 formed on the outer periphery of the bran 2b is transported to the bran discharge passage 34 and the cyclone 36 of the bran processing unit 13 by the pressurized air of a bran transport fan (not shown). The operation panel 6 on the operation room 3 side has a brown rice insertion possible lamp 45, a coin number display lamp 46, a coin mech 47, a glutinous rice selection switch 48, and a whiteness selection (in the illustrated example, upper white / standard / 8). The whiteness adjustment motor 29 can be selected in three stages.
Switches 49, 50, 51, etc. are disposed, and the coin mech 47 is provided with a discriminating unit for inserted coins, a non-illustrated coin sensor that operates for each inserted coin, and the like. The operation panel 6 is provided with a microcomputer for controlling the drive motors of the respective components.

The detection information from the coin sensor, whiteness selection information, a clock signal, and the like are input to an arithmetic control unit (CPU) of the microcomputer. On the other hand, the output information includes a supply spiral drive motor control signal and a crusher 10 drive motor.
There are a control signal for the drive system of the machine, such as a motor, a drive motor for raising / lowering machines 9 and 11, a drive motor for rice milling machine 12, a drive motor 26 for bran transfer, a control signal for whiteness adjustment motor 29, and the like.

The operation of the above example will be described. A 100-yen coin, which is sufficient to secure the operation time corresponding to the amount of the raw brown rice, is inserted in advance into the insertion opening of the coin mech 53, and the brown rice is supplied to the input hopper 8. Subsequently, in the case of glutinous rice processing, one of the whiteness setting switches 49 to 51 is directly operated, whereby a drive signal is output to the motor of the machine system. First, brown rice from the input hopper 8 is transferred. It is thrown into the stone removal elevator 9. The brown rice discharged from the upper part of the elevator 9 enters the destoner 10 and is rocked or subjected to a wind selection process to remove foreign substances mixed therein. The brown rice from the lower part of the sorter 20 is supplied to the rice mill 11 and lifted, and the brown rice tank 2
1 is supplied.

The brown rice flowing down into the polishing room 22 of the rice mill 12 first enters the standard pressure polishing room 22a,
By the rotation of a, the bran layer on the surface is peeled and refined between the grains and the bran removing screen 32. Next, the process proceeds to the low-pressure whitening chamber 22b, where the whitening chamber has a large volume and the whitening roll 2
The rotation of 3b is also slowed down, the pressure for peeling the bran is relieved, and a reasonable whitening pressure is applied to the grain to perform the final finishing. At this time, the compression plate 28 at the outlet is set to a desired pressure by the whitening selection switch, and is finished to a desired whiteness.

The milled rice from the milling chamber 22b is supplied to the milled rice extraction section 7
And is collected in the operation room 3 as appropriate. Operating each section driving motor of the feed helix time t ₁ set by the paid amount has elapsed - motor is stopped, the predetermined time t ₂ later rice mill, etc. the machine drive motor - because motor is stopped, the elevator 9, 11 and brown rice remaining in the whitening chamber 32 can be reduced. When a drive stop signal of the supply spiral 16, specifically, a drive motor 18 stop signal is received, the discharge port for removing the foreign matter of the stone removing machine 10 is set to “open”, and the foreign matter remaining on the sorting board is discharged. It is possible to prevent mixing during the next rice milling operation.

In the above embodiment, the standard pressure whitening chamber 22a and the low pressure whitening chamber 22b are implemented based on both the difference in the volume per unit length of the whitening chamber and the difference in the number of revolutions of the whitening roll 23a or 23b. Although this embodiment has an effect that the process length of the low-pressure whitening chamber can be set short, any of these may be adopted to constitute the low-pressure whitening chamber. Further, in the standard pressure whitening chamber 22a, the standard pressure may be set to a state slightly higher than the normally used whitening pressure.

FIG. 4 shows different forms of the refining chamber and the refining roll. The exit side of the refining roll 23c is formed in a frustoconical shape, and the inner periphery of the refining chamber 22c is provided substantially along this conical shape. The refining roll 23c is provided so as to be movable in the axial direction of the rotating shaft 24c, so that the position of the refining roll 23c can be moved back and forth. By doing so, the whitening process can be performed in accordance with various types of brown rice, and the whitening process is performed by appropriately adjusting the position of the whitening roll 23c back and forth by adjusting the control motor 40 forward and backward to adjust the internal whitening pressure appropriately. is there. That is, in the case of brown rice which is hard and does not easily peel the bran layer, the motor 40 is rotated forward to increase the whitening pressure. On the other hand, in the case of brown rice which is standard or soft and the bran is easily peeled, the motor 40 is rotated in the reverse direction to increase the volume. Widen.

FIGS. 5 and 6 relate to the mounting structure of the bran removing screen. The bran removing screen 32 having a hexagonal cross section has a hexagonal inner periphery along the cross section of the bran removing screen 32 and a large number on the outer periphery. Can be fitted and fixed to a net frame 42 forming the window holes 41, 41,. For example, it is molded by aluminum die casting. In addition, this net frame 42 may be formed in a circumferentially divided type (FIG. 6). In this way, the bran peeled off in the whitening operation is removed from the bran removing screen 32 and the window hole 4.
Are discharged to the outside through 1,41. Thus, net frame 4
The ribs 43 are connected by ribs 43 so as to form 1, 41..., A reinforcing effect is obtained, there is little risk of breakage due to an increase in the whitening pressure, and the corresponding parts can be miniaturized and a silent rice mill can be realized.

[Brief description of the drawings]

FIG. 1 is an overall plan view.

FIG. 2 is a side sectional view of a main part.

FIG. 3 is a front view of the operation panel.

FIG. 4 is a side sectional view of another embodiment.

FIG. 5 is a partial cross-sectional view of a bran removing screen supporting portion.

FIG. 6 is a perspective view of another example of the above.

[Explanation of symbols]

1 ... building, 2 ... partition wall, 3 ... operation room, 4 ... machine room, 5 ...
Brown rice input unit, 6 operation panel, 7 white rice removal unit, 8 input hopper, 9 stone removal / lifting machine, 10 stone removal machine, 11 rice milling / lifting machine, 12 rice milling machine, 13 rice processing unit, 14 opening Part 1
5: Brown rice table, 17: Supply gutter, 19: Foreign material sorting board, 2
0 ... Exit, 21 ... Brown rice tank, 22 ... Refining room, 22a ...
Standard pressure refining room, 22b ... Low pressure refining room, 23, 23a, 2
3b: whitening roll, 24a, 24b: transmission shaft, 25a,
25b: driven pulley, 26: rice milling motor, 27, 27
... Driving pulley, 28 ... Compression plate, 29 ... Whiteness adjustment motor,
Reference numeral 30: white rice tank, 32: removal of bran screen, 34: bran discharge passage, 36: cyclone, 45: lamp capable of introducing brown rice,
46 ... coin number indicator light, 47 ... coin mech, 48 ...
Glutinous rice selection switch, 49-51 ... Whiteness selection switch

Claims (4)

[Claims] 1. A rice milling apparatus provided in a milling chamber for rotatably driving a milling roll for receiving and milling brown rice in a milling chamber, wherein a standard pressure milling chamber for obtaining a standard milling pressure is provided on a side of the milling chamber near a brown rice receiving port. A rice milling machine with a low-pressure milling chamber formed on the side close to. 2. The refining roll of the standard pressure refining chamber and the refining roll of the low pressure refining chamber are rotated and linked at different rotational speeds.
A rice milling apparatus according to item 1. 3. The rice polishing apparatus according to claim 1, wherein the volume of the low-pressure polishing chamber is larger than the volume per unit length of the standard-pressure polishing chamber. 4. A rice mill having an outlet side of a whitening roll formed in a frusto-conical shape, an inner circumference of the whitening chamber provided substantially along the conical shape, and a whitening roll provided movably in the direction of the axis of rotation. apparatus.