JP2009090212A - Rice milling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice milling machine with good rice milling efficiency and good finishing precision of rice milling. <P>SOLUTION: The rice milling machine is configured in a manner that a first rice milling roll (3c) and a second rice milling roll (3e) in a post-process of the first milling roll (3c) rotate on the respective vertical shafts and the outer circumference of the first rice milling roll (3c) is covered with a first rice milling net (7) in which a large number of slits (n1) are formed and the outer circumference of the second rice milling roll (3e) is covered with a second rice milling net (9) in which a large number of slits (n2) are formed and the direction of the slits (n1) of the first rice milling net (7) is slanted and the direction of the slits (n2) of the second rice milling net (9) is set approximately perpendicularly. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rice milling apparatus.

In the rice milling apparatus, the feed roll is attached to the upper part of the main body casing in the vertical direction so that the feed roll is integrally rotated at the upper part of the hollow drive shaft, and the rice mill roll having the ridges is provided at the lower part of the drive shaft. A large number of ventilation holes are opened in the milling net that forms the outer part of the rice milling chamber on the outer periphery of the roll and the rice milling roll, and the ventilation hole farther from the white rice discharge port than the slit width of the ventilation hole close to the white rice discharge port Those having a large slit width are known (Patent Document 1).
Japanese Patent Laid-Open No. 2003-311162

  The present invention is intended to provide a rice milling apparatus with high milling efficiency and high milling finishing accuracy.

  The invention of claim 1 is configured to cover the outer periphery of the whitening roll (3c, 3e) rotating around the vertical axis with a whitening net (7, 9) having a number of slits (n), and the slit (n) In the formation, the milling machine is characterized in that the slit (n1) on the upper side of the whitening is inclined and the slit (n2) on the lower side of the whitening is formed substantially vertically.

The invention of claim 2 is configured such that the first whitening roll (3c) and the second whitening roll (3e) in the subsequent step of the first whitening roll (3c) rotate around the vertical axis, respectively.
The outer periphery of the first whitening roll (3c) is covered with the first whitening net (7) having a large number of slits (n1), and the second whitening with the outer periphery of the second whitening roll (3e) having a number of slits (n2). Covered with a net (9), formed with the direction of the slit (n1) of the first whitened net (7) inclined, and formed the slit (n2) of the second whitened net (9) substantially perpendicularly. A rice milling device characterized by

  The invention according to claim 3 is characterized in that linear irregularities are formed along the axial direction on the outer peripheral surfaces of the first whitening roll (3c) and the second whitening roll (3e). The rice milling apparatus described in 2 is used.

  According to the first aspect of the present invention, since the surface of the grain is likely to act on the slit (n1) by forming the slit (n1) on the upper side of the whitening in an inclined manner, the whitening ability in the whitening process can be improved. it can. Moreover, since the surface of the grain is less likely to act on the slit (n2) by forming the slit (n2) on the lower side of the whitening substantially vertically, it is difficult to apply a whitening load to the whitened rice that has been whitened on the upper side of the whitening. It is possible to finish and whiten while reducing the occurrence of broken rice.

  In the invention of claim 2, since the surface of the grain is likely to act on the slit (n1) by forming the slit (n1) of the first whitening mesh body (7) to be inclined, the whitening ability in the whitening process. Can be improved. Moreover, since the surface of the grain is less likely to act on the slit (n2) by forming the slit (n2) of the second whitening net (9) substantially vertically, It is difficult to apply a whitening load, and finishing whitening can be performed while reducing the occurrence of broken rice.

  According to the invention of claim 3, in addition to the above-mentioned action of the invention of claim 2, due to the unevenness, the grain surface is ground in contact with the unevenness portion one after another, and the rice bran layer on the brown rice surface is spotted with a small whitening load. It can be ground less.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of the rice mill 1, and FIG. 2 shows a cut side view of the rice mill 1.
A polished rice pedestal 2a is placed on the main pedestal 2, and a vertical first shaft 4 and a second shaft 5 that rotate about the same axis in the rotational direction D are supported on the polished rice pedestal 2a via upper and lower bearings. ing. And the 1st axis | shaft 4 which passes the inside of the 2nd axis | shaft 5 is extended upwards rather than the 2nd axis | shaft 5, and the taper-shaped equalizing plate 3a from the upper side to the lower side is provided in the 1st axis | shaft 4. A feed white spiral 3b, a first whitening roll 3c and a second feed spiral 3d, which are formed with a plurality of linear concave portions m and convex portions g on the outer peripheral surface at set intervals in the axial direction, are attached.

  Further, on the lower second shaft 5, a second whitening roll 3e, a first resin roll 8a, and a second resin roll in which a large number of linear concave portions m and convex portions g are formed on the outer peripheral surface at set intervals. A resin roll 8 consisting of 8b is attached.

  That is, the whitening portion 3 is constituted by the first feed spiral 3b, the first whitening roll 3c, the second feed spiral 3d, and the second whitening roll 3e, and the polishing portion 8 is constituted by the first resin roll 8a and the second resin roll 8b. Constitute.

  In the first whitening roll 3c and the second whitening roll 3e, the concave portion m and the convex portion g are linearly formed in the axial direction at predetermined intervals. For example, the depth of the concave portion m is the thickness of brown rice (about 2 mm). It is formed shallower (0.4 to 0.5 mm) and wider than the long diameter (about 7 mm) of brown rice (about 10 mm). And the uneven | corrugated shape is comprised over the whole outer peripheral surface.

The 1st resin roll 8a and the 2nd resin roll 8b are comprised by the grinding | polishing roll which grind | polishes polished rice by stacking many disk bodies of resin-made predetermined thickness.
The 1st whitening roll 3c, the 2nd whitening roll 3e, the 1st resin roll 8a, and the 2nd resin roll 8b are arrange | positioned on the same axial center, The 1st whitening net body 7 and the 2nd whitening net body 9 are discharged | emitted by the circumference | surroundings. The whitening chamber 6 is formed by covering with a dust net 13.

  The first whitening net 7, the second whitening net 9, and the dust collection net 13 form flanges f at the upper end and the lower end, respectively, and the flange f2 at the lower end of the first whitening net 7 and the second whitening net 9 is connected by a connector j, and a flange f4 at the lower end of the second refined net body 9 and a flange f5 at the upper end of the dust net 13 are connected by a connector j. And the flange f1 of the upper end of the 1st whitening net body 7 and the flange f6 of the lower end of the dusting net body 13 are the outside which covers the outer periphery of the 1st whitening net body 7, the 2nd whitening net body 9, and the dusting net body 13. It is set as the structure attached to the inside of the pipe | tube W. FIG.

  As shown in FIG. 1, the first whitening net 7 covers the outer circumferences of the first whitening roll 3c and the second feed spiral 3d, and the second whitening net 9 covers the outer circumferences of the second whitening roll and the first resin roll 8a. It is configured to cover. The dust net 13 is configured to cover the outer periphery of the second resin roll 8b. Then, as shown in FIG. 4, a large number of slanted ellipsoidal slits n1 are formed in the first whitening mesh body 7, and a number of substantially vertical elliptical slits n2 are formed in the second whitening mesh body 9. In addition, a large number of circular small holes n3 are formed in the dust net 13.

  A cocoon chamber 10 is disposed between the outer periphery of the first whitening net body 7 and the second whitening net body 9 and the inside of the outer cylinder W, and the starting end side of the cocoon extraction cylinder 12 is connected to the lower part of the cocoon chamber 10; A scissors fan 11 is disposed on the terminal end side of the scissors extraction cylinder 12.

  In addition, a start end side of the dust discharge cylinder 15 is connected to the outer cylinder W at a position facing the outside of the dust discharge net body 13, and a suction exhaust fan 14 (shown in FIG. 5) is provided on the terminal end side of the dust discharge cylinder 15. The dust in the dust net 13 that is the white rice extraction portion is discharged by the suction exhaust fan 14.

  Further, a first rice milling motor M1 is provided on the upper side of the main pedestal 2a, and the rotational power of the first rice milling motor M1 is transmitted to the first shaft 4 via the belt transmission 22 and the first pulley 4f, and the first The single white roll 3 is driven. Further, a second rice milling motor M2 is provided on the other upper side of the main pedestal 2a, and the rotational power of the second rice milling motor M2 is transmitted to the second shaft 5 via the second belt transmission device 24 and the second pulley 5a. The second whitening roll 8 and the resin roll are driven.

  A first whitening roll rotation sensor SE1 is provided above the first pulley 4f of the first shaft 4, and a second whitening roll is provided above the second pulley 5a of the second shaft 5 and below the rice pedestal 2a. A rotation sensor SE2 is provided and configured to detect the rotation speeds of the first whitening roll 3 and the second whitening roll 8.

The operation of the rice milling apparatus of the present embodiment will be described below.
The grains supplied from the milled rice hopper 1a to the milling chamber 6 are the first feed spiral 3b, the first milling roll 3, the second feed spiral 3d, the first milling net 7, the second milling roll 8, and the second milling net. The grain is refined while flowing down the body 9 spirally. And it passes through the 1st resin roll 8a and the 2nd resin roll, is polished, and is discharged out of the machine from the polished rice discharge port P as unwashed rice.

  The first whitening roll 3 and the second whitening roll 8 can increase the degree of whitening by increasing the rotation speed. In addition, the whitening process can be performed by controlling the number of rotations to a desired value for separate driving.

  In addition, rice cake generated in the milled rice is sucked and discharged out of the machine by the rice cake fan 11 through the rice cake chamber 10 and the rice cake extraction cylinder 12. Further, the polished rice that has moved to the lower side is taken out from the lower side of the dust net 13, and dust and crushed rice mixed in the polished rice are sucked and removed by the suction exhaust fan 14 via the dust discharge cylinder 15. The

  The structure and action of the slit n will be described in detail with reference to FIG. Grinding is effected by the irregularities on the surface of the whitening roll while flowing down in a spiral. Moreover, the slit n1 of the first refined net body 7 is formed so as to be inclined so that the longitudinal side thereof is directed to the direction k flowing down in a spiral shape of the grain. It is desirable that the flow direction k and the angle α1 on the longitudinal side of the slit are substantially orthogonal. Thus, by forming the slit n1 in an inclined manner, the surface of the grain Y flowing down can act on the slit n1 more, and the whitening efficiency in the initial whitening is improved.

  (I) shows the slit n of the second whitening net body 9, and the grains (milled rice) Y polished by the first whitening roll 3c and the first whitening net body 7 are subjected to the whitening chamber by the second whitening roll 3e rotating action. Grinding is effected by the irregularities on the surface of the roll while flowing down in a substantially spiral shape. In addition, the slit n2 of the second refined net body 9 has a smaller angle α2 on the longitudinal side with respect to the direction k flowing down in the spiral of the grain than the angle α1 of the slit n1, so the surface of the grain Y flowing down Has a small ability to act on the slit n2, and the whitening load is small. Accordingly, it is possible to reduce the crushed rice of the polished rice and facilitate the finish polishing of the polished rice. That is, the first whitening roll 3c can perform the rough whitening process with a high whitening load, and the second whitening roll 3e can perform the final whitening process with less ground rice by performing the finishing whitening process with a low whitening load.

  Then, the polished rice that has been subjected to the whitening treatment by the second polishing roll 3e is polished by the first resin roll 8a, then finish-polished by the second resin roll 8b, and discharged out of the machine from the polished rice discharge port P.

Since dust and crushed rice pass through the circular hole 13 of the dust net 13, the quality of the polished rice discharged outside the machine can be improved.
Next, FIG. 5 will be described. The starting end side of the coffin hose 11a is connected to the lower end of the coffin chamber 10, and the coffin fan 11 is disposed on the terminal end side of the coffin hose 11a so that the coffin is sucked and discharged from the coffin chamber 10. . Further, the start end side of the dust exhaust cylinder 15 is connected to the lower end portion of the dust exhaust net 13, and the suction exhaust fan 14 is disposed on the terminal end side of the dust exhaust cylinder 15, so that dust is sucked and removed from the discharged white rice. It is configured to do. Further, the air volume adjusting means 32 is provided in the dust exhaust cylinder 15. The air volume adjusting means 32 is composed of an air valve 32a provided in the dust exhaust cylinder 15 and an air valve adjusting motor 32b.

  According to the above configuration, the milled rice discharge amount is adjusted to increase / decrease by adjusting the air volume adjusting means 32 provided in the dust discharge cylinder 15 and increasing / decreasing the suction air volume of the dust discharge cylinder 15. That is, by increasing the suction air volume of the dust exhaust cylinder 15, the amount of white rice discharged from the polished rice discharge port P is decreased, and by decreasing the suction air volume, the polished rice discharge amount is increased. Rice milling can be performed while adjusting the whitening load in the whitening chamber 6 to be increased or decreased.

  Moreover, you may comprise as FIG. A cocoon chamber 10 is provided outside the first whitening net body 7, the second whitening net body 9 and the dust collection net body 13, and the lower end of the second whitening net body 9 in the coffin chamber 10 and the dust collection net body 13. The start end side of the dust discharge cylinder 15 is connected to a portion corresponding to the start end side end, and the terminal end side of the dust discharge cylinder 15 is connected to the soot fan 11. In addition, if a control valve is provided in the exhaust part of the dust net body 13 to adjust the exhaust air amount of the dust net body 13, the amount of polished rice discharged can be increased or decreased to adjust the whiteness degree. it can.

  According to the above-described configuration, while the cost is reduced by the single rice bran fan 11, the rice cake is discharged from the first whitening net body 7 and the second whitening net body 9, and the whitened rice dust is discharged from the dusting net body 13. Can be discharged and removed.

Next, the rotational speed detection control of the rice mill 1 will be described with reference to FIG.
A first whitening roll rotation sensor SE1, a second whitening roll rotation sensor SE2, a start switch SW1, and a germ rice switch SW2 are connected to the input side of the controller 35, respectively. Further, the output side of the controller 35 is connected to a first rice milling motor M1, a second rice milling motor M2, a rice bran fan motor M3, and an air valve adjusting motor 32b for adjusting the air valve 32a via an inverter (not shown). Yes.

  When the start switch SW1 is turned ON, the first rice milling motor M1 and the second rice milling motor M2 are started. Subsequently, the rotation speed of the 1st whitening roll 3 and the 2nd whitening roll 8 in a no-load state is detected. At the time of detection, when a predetermined time elapses from the start and the load current value is stabilized, an average process is performed on a plurality of rotation speeds obtained in a predetermined time (or a plurality of rotation speeds obtained every predetermined time), and an initial no load is applied. Calculate and set the number of revolutions.

  When the first rice milling motor M1 and the second rice milling motor M2 are started in a no-load state, the rotation speeds of the first milling roll 3 and the second milling roll 8 are gradually increased, and the rotation speed is stabilized when a predetermined time elapses. . In this state, for example, an average value of the number of detected pulses three times in a predetermined time is set as the initial no-load rotational speed. When the rice milling load starts to be applied, the detected rotational speed decreases sequentially from the initial no-load rotational speed, and this rotational speed deviation is the milled rice load, showing a high correlation with the load current value, You can know the state of rice milling load.

  The loads on the first shaft 4 and the second shaft 5 of the rice mill may change slightly due to secular changes even in a no-load state. In order to perform stable control of the rotational speed, it is necessary to accurately grasp the initial rotational speed in the no-load state.

  As described above, the rotation speed in the unloaded state of the first shaft 4 and the second shaft 5 is detected by the first whitening roll rotation sensor SE1 and the second whitening roll rotation sensor SE2, and the initial no-load rotation speed is determined by the above method. By detecting and setting the change in the rotational speed with reference to this, the current rice load of the rice mill 1 can be accurately detected. Therefore, it is possible to polish rice with an appropriate degree of milling while preventing damage to the grain.

The rice milling control will be described with reference to FIGS.
During the rice milling operation, it is determined whether or not the germ rice switch SW2 is ON (step S1). If Yes, the controller 35 issues a saddle fan 11 intermittent operation command, and the straw fan motor M3 rotates intermittently.糠 The amount of wind exhaust and the amount of white rice dust exhaust becomes weak, the rice milling load is weakened, and the rice can be polished while increasing the remaining amount of germ.

  Further, it is determined whether or not the germ rice switch SW2 is ON (step S1). If No, the controller 35 issues a continuous operation command for the straw fan 11 (step S3), and the straw fan motor M3 continuously rotates. (Step 4S). Thus, the rice bran fan 11 rotates continuously, the amount of rice cake exhausted air and the amount of dust exhausted from white rice increases, the rice milling load increases, and the whitening can be performed while reducing the remaining amount of germ.

According to the said structure, the change of the exhaust air volume of the reed fan 11 can be performed at low cost, and rice mill load adjustment can be comprised at low cost.
Next, another control will be described based on FIGS. 6, 7 and 9. FIG.

  A tub chamber 10 is provided outside the first scouring net body 7, the second scouring net body 9, and the dust collection net body 13, and the start end side of the dust evacuation cylinder 15 is connected to the lower part of the cocoon chamber 10. The end side is connected to the kite fan 11, and the kite is taken out from the kite fan 11 through the kite cyclone 41 into the kite bag 42. The dust exhaust cylinder 15 is provided with an air volume adjusting means 32 including an air valve and an air valve adjusting motor.

  According to the above configuration, when the germ rice switch SW2 is turned on, the controller 35 issues an air volume reduction adjustment command, the drought exhaust air volume becomes weak, the rice milling load is reduced, and whitening can be performed while increasing the remaining amount of germ.

  In addition, when the germ rice switch SW2 is OFF, the controller 35 issues an air volume increase adjustment command, the drought exhaust air volume increases, the rice milling load is strengthened, and the remaining rice is reduced efficiently. it can.

Note that the speed of the soot fan motor M3 may be varied by an inverter or the like, and the soot exhaust amount may be increased or decreased.
According to the said structure, it can switch to germinated rice polished rice and non-germless polished rice rice by changing the amount of straw exhausted air of the straw fan 11.

Next, the whitening net and the dust net shown in FIGS. 1 and 4 may be configured as shown in FIG.
An inclined slit n1 is formed in a portion of the whitening net 7 facing the first whitening roll 3c of the whitening portion 3. Then, the portion facing the second whitening roll 3e is covered with a whitening mesh body 7 forming a slit n2 formed substantially vertically.

Further, the outer peripheral portion of the polishing portion 8 is covered with a second whitening net 9 in which slits n3 that are formed substantially vertically are formed.
According to the above configuration, the first milling roll 3c can be polished while increasing the efficiency of polishing, and the lower portion can be polished while reducing the rate of broken rice.

  Moreover, you may comprise as FIG. A portion of the first whitening net 7 facing the first whitening roll 3c and the second feed spiral 3d of the first whitening roll 3 is formed with an inclined slit 7a, and the first whitening net facing the second whitening roll 3e. The part of the body 7 is formed substantially vertically. That is, slits in different directions are formed in one polished net.

  Further, when the slit n is formed in the first whitening net body 7 and the second whitening net body 9 covering the outer peripheral portions of the first whitening roll 3 and the second whitening roll 8, the lower side is lower than the upper side. The slit width is gradually reduced toward the side, and the rice milling load is reduced toward the lower side, or the upward inclination angle of the slit-shaped drainage hole toward the upper side in the rotational direction is sequentially reduced to the upper side. On the other hand, you may comprise so that a rice polishing load may be made small toward the lower side. Further, the first whitening net body 8 facing the second feed spiral 3d of the first whitening roll 3 may be formed of a non-porous plate without providing a drain hole.

  According to the said structure, a broken rice rate can be made low and the lock | rock of the grain in polished rice can be decreased.

Side view explaining the inside of a rice mill Perspective view of whitening roll SS sectional view of FIG. Perspective view of whitening net Perspective view of rice mill Cutting perspective view of rice mill Control block diagram flowchart Side view of rice mill and rice bran discharge device Side view of whitening roll and whitening net Perspective view of whitening net Diagram explaining the action of the slit

Explanation of symbols

3c 1st whitening roll 3e 2nd whitening roll 7 1st whitening net n1 slit 9 2nd whitening net n2 slit

Claims (3)

  The outer periphery of the whitening roll (3c, 3e) rotating around the vertical axis is configured to be covered with a whitening net (7, 9) having a large number of slits (n), and when the slit (n) is formed, the whitening upper side The rice milling apparatus is characterized in that the slit (n1) is inclined and the slit (n2) on the lower milling side is formed substantially vertically. The first whitening roll (3c) and the second whitening roll (3e) in the subsequent step of the first whitening roll (3c) are each configured to rotate about the vertical axis,
The outer periphery of the first whitening roll (3c) is covered with the first whitening net (7) having a large number of slits (n1), and the second whitening with the outer periphery of the second whitening roll (3e) having a number of slits (n2). Covered with a net (9), formed with the direction of the slit (n1) of the first whitened net (7) inclined, and formed the slit (n2) of the second whitened net (9) substantially perpendicularly. Rice milling device characterized by   3. The rice milling apparatus according to claim 2, wherein a linear concavo-convex portion is formed along the axial direction on the outer peripheral surfaces of the first milling roll (3 c) and the second milling roll (3 e).

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