JP3271408B2 - Vertical grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical grinding machine for rice and wheat.

[0002]

2. Description of the Related Art Conventionally, in a vertical grinding type grain mill in which a grinding type milling roll is superimposed on a rotatably mounted main shaft (see Japanese Patent Publication No. 4-23580), a so-called upper feed type or Regardless of the lower feed type, the whitening effect acts almost uniformly in the circumferential direction, but there is a difference in the upper, middle, and lower stages in the vertical direction. In other words, immediately after the supply of brown rice, the grinding action does not proceed due to the waxy quality of the brown rice surface, and the paste layer (bran) layer is peeled off in the final polishing step. Since the relatively hard endosperm part is exposed when separated, it is thought that although the internal pressure increases due to external resistance, the whitening hardly proceeds.

On the other hand,

The solid line in FIG. 4 shows each step of the polishing process when brown rice of long grain type (Indica rice) is supplied and ground to a grinding type vertical grain mill having a bran-removing action by blowing from each roll gap. It is a figure which shows the outline of the change of the angle of repose of the rice grain extracted from the position. According to this, the angle of repose is larger for rice grains in the middle part of the milling process, which indicates that the rice grains in the middle part, which are considered to be most active in the whitening action, have a rough rice grain surface and rice bran powder. Indicates that a large amount is attached.

[0004] From these facts, it is presumed that refining is most active in the intermediate process part of the refining process. However, since the blowing of the same air volume was conventionally performed through the refining process, the removal of bran in the intermediate process part was conventionally performed. Was not sufficiently performed, and the internal pressure in the intermediate process was increased to cause the generation of broken rice.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is a grinding method capable of promoting rice bran removal in an intermediate step of a whitening step, suppressing an abnormal increase in internal pressure, and preventing the generation of broken rice. It is a technical object to provide a vertical milling machine.

[0006]

According to the present invention, a spindle is rotatably supported in an upright perforated wall bran polishing cylinder, and a plurality of grinding-type polishing rolls are mounted on the spindle. In addition, in a vertical grinding machine in which a single mill or a continuous vertical milling machine is used, in which the gap between each milling roll is a blast channel, the blast channel in the intermediate process part of the milling process is It is a technical measure that the width is formed wider than the blowing grooves near the supply section and near the end of the refining process.

[0007] The blowing groove may communicate with the outside of the machine through a ventilation opening formed between the arms of the respective whitening rolls.

[0008]

[Functions and Effects] The raw material grains supplied from the raw material grain supply section rotate and revolve while contacting the peripheral surface of the whitening roll in the whitening room, and the surface layer is gradually scraped off and the whitening proceeds. The whitening action peaks in the middle step of the whitening process, and a large amount of bran powder is generated. It is removed outside the milling cylinder to prevent the generation of broken rice due to a sudden rise in internal pressure.

[0009] Since the bran-removing air from the blast groove communicates with the outside of the machine through the ventilation opening formed between the arms of the whitening roll, a large amount of fresh air outside the machine can be easily taken in.

[0010]

Next, taking a case where rice grains are milled as grains as an example, a vertical grinding machine of a preferred embodiment according to the present invention will be described with reference to FIGS. 1 and 2. FIG.

In FIG. 1 showing an overall vertical sectional view of a grinding type vertical grain mill 1, reference numeral 2 denotes a base, and a main shaft 5 is mounted on upper and lower bearings 3 and 4 in the base 2. 2 stands vertically and rotatably at substantially the center. A pulley 6 is provided at the lower end of the main shaft 5, and the pulley 6 and the pulley 8 of the motor 7 are connected by a V-belt 9. The main shaft 5 has a hollow shape for weight reduction, and an upper half thereof projects above the base 2.

The bran collecting tube 11 having an open upper portion is surrounded by the upper end circle of the base 2 and the bearing tube 1 so as to surround the vicinity of the upper bearing 3.
0 and fixed. A rotating cylinder 12 having an open lower portion is provided on the main shaft 5 in the bran collecting tube 11 to form a bran collecting chamber 41 therebetween. The rotating bran scraping blade 13 is mounted. Further, a bran discharge port 14 is opened at the bottom of the bran collecting cylinder 11, and the bran discharge port 14 is connected to a bag filter and a bran collecting fan (not shown) by a bran duct 15.

The rotating ring 16 is mounted on the rotating cylinder 12 and
And a grinding-type whitening roll (hereinafter referred to as “whitening roll”) 17 is superposed on the rotating ring 16. That is, a circular hole 19 and a key groove 20 for inserting the main shaft 5 are provided in the boss portion 18 of each of the whitening rolls 17 (see FIG. 3). A plurality of ventilation openings 22 are provided for connection.

The thickness between the polishing rolls 17 is 7 to
A 10 mm collar 23 is interposed. The collar 23 is attached to the main shaft 5 similarly to the boss 18 of the whitening roll 17. In the present embodiment, a collar 23 of 7 to 8 mm is axially attached to the upper and lower portions of the whitening roll 17 group, and a collar 23 of 9 to 10 mm is used for the middle portion. This allows
In the upper part and the lower part, a gap of 7 to 8 mm 6
In the middle portion, gaps 61 each having a diameter of 9 to 10 mm are formed.

In this way, a plurality of whitening rolls 17 are polymerized via the collar 23 to form a group of whitening rolls 17. A cylindrical spiral roll 28 is provided on the whitening rolls 17, and the spiral roll 28 is provided. Boss 28a
Is held down by a bolt 29 screwed into the upper end of the main shaft 5, whereby the spiral roll 28, the collar 23, and the plurality of polishing rolls 17 are integrally mounted on the main shaft 5. A hollow cone-shaped guide 30 is connected and provided at the upper opening of the spiral roll 28, and openings 3 are provided at a plurality of locations on the peripheral surface of the guide 30.
4 is provided to connect one end of the outside air intake tube 31, and the other end of the outside air intake tube 31 is connected to an opening 33 provided in the upper cover 32. Further, the grain supply port 5 at the upper end of the upper cover 32
At 0, a supply amount adjusting device 35 is provided.

On the other hand, a bran removing cylinder 36 is erected around the group of polishing rolls 17 to form a refining chamber 40 having a main portion between the bran removing cylinder 36 and the refinement roll 17 group. The bran removing cylinder 36 is formed by supporting an arc-shaped bran removing net 36a between four pillars 37, and an arc-shaped cover 38 is mounted between the pillars 37 to form a bran removing chamber 39. The lower end of the bran removing chamber 39 is connected to the bran collecting chamber 41. Further, a grain discharge port 42 communicating with the refining chamber 40 is provided below the bran removing cylinder 36, and a discharge gutter 43 is provided to be connected to the discharge port 42. A resistance plate 45 biasing toward the outlet 42 is mounted. The discharge port 42 discharges grains into the discharge gutter 4.
It is preferable to provide a guide plate 46 for guiding to 3. Further, a resistance bar 47 is loosely fitted (canned) in a recess formed in each of the columns 37, and the resistance bar 47 is formed so as to be able to enter and exit the refinement chamber 40 by adjusting knob bolts 48.

The specific operation of the above embodiment will be described below. The grain supply port 5 is controlled by the supply amount control device 35.
The raw rice grains (brown rice of Indica rice) are supplied at a suitable flow rate at 0 and flow down almost uniformly in the circumferential direction along the slope of the guide 30, and further into the polishing chamber 40 by the spiral roll 27. Sent in. The rice grains in the refining chamber 40 contact the periphery of the rotating refining roll 17 and rotate and revolve in the refining chamber 40 along the bran removing cylinder 36 while being stirred by the resistance bar 47, and the surface layer is formed by the abrasive grains. The part is cut.

Further, the outside air that has passed through the ventilation opening 27 of the outside air intake cylinder 31, the guide body 30, the spiral roll 28, and the ventilation roll 22 of the whitening roll 17 is blown from the blowing groove 27 by the suction force of a fan (not shown). Then, the bran powder peeled off from the rice grains is immediately removed from the bran removing net 36a into the bran removing chamber 39. Then, the bran in the bran removing chamber 39 is transported to a bag filter (not shown) through the bran collecting chamber 41 and the bran duct 15. At this time, from the relatively large gap 61 in the middle part of the whitening roll 17 group,
A larger amount of air is blown than the lower part, which promotes the action of removing rice bran in the middle part. The dashed line in FIG. 4 shows the angle of repose of the rice grains in this case, and it can be seen that the angle of repose is smaller than that of the conventional blast, that is, the rice grain surface is smooth. .

Rice grains (milled rice) reaching the lower end of the milling chamber 40
Is discharged from the grain discharge port 42 by being guided by the guide plate 46 against the resistance plate 45 urged by the weight 44.

FIG. 2 is a front view showing another embodiment of the whitening roll 17. That is, two grinding type vertical grain mills 1 are arranged in series, and the discharge gutter 43 of the grinding type vertical grain milling machine 1A of the preceding process and the grain supply of the grinding type vertical grain milling machine 1B of the following process. Mouth 50
Are connected by a suitable transporting means 52. With this configuration, a predetermined yield (9%) is obtained in the same manner as in the previous embodiment.
0%).

In this case, the collars 23 having different thicknesses are used.
As a result, the upper part of the grinding type vertical grain mill 1A in the preceding process is
8mm gap 60 and the lower part 9 ~
A gap 61 of 10 mm is provided, and a lower portion of the vertical grinding machine 1B in the subsequent process is provided with a gap 60 of 7 to 8 mm, and an upper portion thereof is provided with a gap 61 of 9 to 10 mm. Adjust two refining chambers 40A, 40B
Is performed once to perform whitening at a predetermined yield (90%). At this time, a relatively large amount of blast from the blast grooves 27 each having a gap 61 of 9 to 10 mm near the lower part of the grain mill 1A and the upper part of the grain mill 1B corresponding to the middle part of the whitening process. This promotes the removal of bran in the intermediate step where the whitening action is active.

FIG. 3 shows a case in which a blast spacer 24 is mounted on the shaft instead of the collar 23. As in the case of the collar 23, those having a thickness of 7 to 8 mm and those having a thickness of 9 to 10 mm are used.
The arm 26 protrudes radially from 5, and the tip of the arm 26 is curved toward the rear side in the rotation direction (R) of the whitening roll 17. The blast spacers 24 create gaps 60 and 61 between the respective whitening rolls 17, and the gaps 60 and 61 form the blast grooves 27. In order to prevent the blast opening 22 from being closed (removed), it is preferable that the arm portion 26 of the blast spacer 24 and the arm 51 of the whitening roll 17 overlap as much as possible.

In the above-described embodiment, the case where the grains are supplied from above the polishing chamber 40 and the grains are discharged from below the polishing chamber 40 has been described. In some cases, the grains are supplied to discharge the refined grains from above.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a grinding type vertical grain mill of a preferred embodiment according to the present invention.

FIG. 2 is a front view showing a grinding type milling roll of another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an embodiment in which a blowing spacer is used instead of a collar.

FIG. 4 is a graph showing the relationship between yield and angle of repose.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grinding type vertical grain mill 2 Base 5 Main shaft 13 Bran scraping blade 14 Bran discharge 17 Grinding type whitening roll 18 Boss part 21 Grinding stone part 22 Ventilation opening 23 Collar 27 Spout groove 28 Spiral roll 30 Guide body 31 Outside air Intake cylinder 36 Bran removal cylinder 39 Bran removal room 40 Refining room 41 Harvesting room 60 Gap 61 Gap

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B02B 3/06 B02B 7/00

Claims (2)

(57) [Claims] 1. A main shaft is rotatably supported in an upright perforated wall bran refining cylinder, a plurality of grinding-type whitening rolls are axially mounted on the main shaft, and a gap between the whitening rolls serves as a blowing groove. In the grinding type vertical grain mill in which the vertical grain milling machine is a single seat or a continuous seat, the blast grooves in the intermediate process part of the polishing process are separated from the blast grooves in the vicinity of the raw material grain supply part and in the vicinity of the end part of the polishing step. A vertical milling machine characterized by a wide width. 2. The grinding type vertical grain mill according to claim 1, wherein the blowing grooves communicate with the outside of the mill through ventilation openings formed between arms of the milling rolls.