JP2011224444A - Rice polishing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice polishing apparatus which reduces irregularity in rice polishing and improves a yield.SOLUTION: In the rice polishing apparatus which includes a conveying portion for conveying unpolished rice, and a rice polishing portion provided continuously to the conveying portion and polishing the unpolished rice conveyed from the conveying portion between a cylindrical agitating roll and a cylindrical bran removing net accommodating the agitating roll under a predetermined rice polishing pressure, a projection projectively extending in the longitudinal direction of the roll and a restricting portion extending from the middle of the projection along the peripheral surface of the agitating roll and restricting the movement of the unpolished rice are formed on the peripheral surface of the agitating roll.

Description

  The present invention relates to a rice milling apparatus.

  Conventionally, in a rice milling apparatus, a horizontal rice milling apparatus (for example, refer to Patent Document 1) that transports brown rice in the horizontal direction and mills it in the milling part, and a vertical rice milling apparatus that transports brown rice in the vertical direction and mills it in the rice milling part. (For example, see Patent Document 2). The rice milling unit in both horizontal and vertical rice milling equipment comprises a scouring net and a stirring roll provided with wings protruding at the periphery, and a milling chamber is formed between the scouring net and the stirring roll. Is done.

  That is, the brown rice transported from the transport unit to the start side of the milled rice chamber becomes milled rice by moving to the milled rice discharge port while being stirred between the stirring roll and the screen. In both of these rice milling devices, the resistance lid provided by energizing the discharge port of the rice milling section adjusts the rice milling pressure applied to the brown rice in the rice milling section, and the rice bran is crushed from the brown rice by contact pressure and contact friction between the rice grains in the rice milling section. This layer is removed to become white rice, which is discharged from the outlet by pushing the resistance lid.

JP 2002-273242 A JP-A-3-296444

  However, in conventional vertical and horizontal rice mills, brown rice moving on the peripheral surface of the stirring roll moves faster to the milled rice discharge port than brown rice moving on the inner wall side of the screen. Therefore, when comparing the whiteness of the brown rice that moves through each, the whiteness of the brown rice that moves around the peripheral surface of the stirring roll is poor, resulting in a problem of uneven rice milling.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the rice milling apparatus which can reduce rice mill nonuniformity.

  The invention according to claim 1 is a transfer unit that transfers brown rice, and a brown rice that is connected to the transfer unit and that is transferred from the transfer unit, and that stores a cylindrical stirring roll and the stirring roll. A rice milling apparatus comprising a rice milling unit that mills rice at a predetermined milling pressure with a squeezing net, and a projecting ridge that extends in a projecting manner in the longitudinal direction of the roll on the circumferential surface of the stirring roll. It is characterized in that a regulation part is formed which extends along the roll peripheral surface from the middle of the strip and regulates the movement of brown rice.

  The invention according to claim 2 is characterized in that, in the rice milling apparatus according to claim 1, the height of the restricting portion is lower than the height of the ridge.

  The invention according to claim 3 is the rice milling apparatus according to claim 1 or 2, wherein a plurality of the restricting portions are provided on a peripheral surface of the stirring roll.

  The invention according to claim 4 is the rice milling apparatus according to any one of claims 1 to 3, wherein the rice milling unit performs rice milling while feeding the transported brown rice in the horizontal direction. And

  Further, the invention according to claim 5 is the rice milling apparatus according to any one of claims 1 to 3, wherein the rice milling unit performs rice milling while feeding the conveyed brown rice in a vertical direction. And

  According to the present invention, a transport unit that transports brown rice, and a cylindrical strip that is connected to the transport unit and transports the brown rice transported from the transport unit to a cylindrical stirring roll and the stirring roll. And a rice milling unit that polishes the rice at a predetermined rice milling pressure between the ridge and the middle of the ridge on the circumferential surface of the agitating roll and the ridge extending in the roll longitudinal direction. Since a restriction part is formed that extends along the circumferential surface of the roll and restricts the movement of brown rice, when the brown rice is conveyed from the conveyance part into the milled rice chamber, the brown rice that moves on the circumferential surface of the stirring roll is regulated. The movement toward the milled rice discharge port is regulated by the section, and the speed is the same as that of the brown rice moving on the inner wall of the screen. As a result, the whiteness of the polished rice between the brown rice moving on the peripheral surface of the stirring roll and the brown rice moving on the inner wall of the scouring net becomes uniform, and unevenness of the polished rice can be reduced.

It is a sectional side view which shows the horizontal type rice milling apparatus which concerns on this embodiment. It is a sectional side view which shows the principal part of a rice milling apparatus. (A) It is a perspective view which shows a stirring roll. (B) It is a perspective view which shows a stirring roll. It is a front view which shows a stirring roll. It is explanatory drawing which shows the flow of the brown rice in the milled rice chamber provided with the stirring roll which has a square-shaped control part in a cross section. It is explanatory drawing which shows the flow of the brown rice in the rice mill room provided with the stirring roll which has a control part which is triangular shape in cross section. (A) It is a perspective view which shows a stirring roll. (B) It is a perspective view which shows a stirring roll. It is explanatory drawing which shows the operating state of a rice milling apparatus. It is explanatory drawing which shows the operation state of the rice milling apparatus provided with the stirring roll which has a control part. It is a sectional side view which shows the vertical rice milling apparatus which concerns on this embodiment.

  Hereinafter, specific embodiments of the rice milling apparatus according to the present invention will be described with reference to the drawings.

[Horizontal rice milling machine]
A horizontal rice mill will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the rice milling apparatus 1 according to this embodiment includes a brown rice supply unit 2 that stores brown rice a, a conveyance unit 3 that horizontally conveys the brown rice a from the brown rice supply unit 2, and this conveyance The rice milling unit 4 connected to the unit 3 and milling the brown rice a conveyed from the conveying unit 3 with a predetermined milling pressure, and discharging the milled rice b (see FIG. 2) from the rice milling unit 4, A white rice discharge mechanism 5 having a function of adjusting the milled rice pressure is provided.

  The brown rice supply unit 2 includes a hopper unit 6 that supplies the stored brown rice a to the transport unit 3. A short brown rice supply cylinder 10 having a brown rice supply port is directed downward at the center of the bottom of the hopper unit 6. Projecting. The brown rice supply cylinder 10 is connected to the ceiling of the transport unit 3.

  The conveyance unit 3 is configured as a screw feeder, and the conveyance screw 11 that stably supplies a certain amount of the brown rice a stored in the hopper unit 6 to the milled rice unit 4 and the conveyance screw 11 are rotatable. And a transfer chamber 12 accommodated therein. The transport screw 11 is disposed horizontally in the transport chamber 12 disposed below the hopper 6 so that the axial direction coincides with the lateral direction.

  The transfer chamber 12 is configured in a cylinder concentric with the transfer screw 11, and a supply port 10 a is formed on the axial base end side of the transfer screw 11 and on the ceiling portion side of the casing 9 of the transfer chamber 12. A brown rice discharge port opened at the center of the bottom of the hopper portion 6 communicates with the supply port 10a so as to face the supply port 10a, and the brown rice a in the hopper falls into the transfer chamber 12 through the supply port 10a. Supplied.

  A drive shaft 21 is interlocked and connected to the base end of the conveying screw 11, and the drive shaft 21 is rotatably supported by bearing portions 22 and 23 and is connected to a passive pulley 28.

  That is, in the state where the conveying screw 11 is cantilevered by the drive shaft 21, the driving force from the motor unit 24 as the power unit provided below the conveying unit 3 is connected to the output shaft 25 of the motor unit 24. The power is transmitted through the pulleys 26 and 28 to rotate around the axis. Note that a belt 27 for transmitting power from the output shaft 25 is suspended between the drive pulley 26 and the passive pulley 28.

  In addition, you may make it adjust the quantity of the brown rice a discharged | emitted from the brown rice discharge port of the bottom part of the hopper part 6 with a shutter, or by adjusting the rotation speed of the conveyance screw 11, from the brown rice supply part 2 You may make it adjust the supply amount of the brown rice a supplied.

  A cylindrical rice milling chamber 30 constituting the rice milling unit 4 is provided on one end side in the horizontal direction of the transfer chamber 12 so as to communicate in the horizontal direction in a lying state. Although the transfer chamber 12 and the rice milling chamber 30 of the rice milling unit 4 in the present embodiment are horizontally installed so as to be horizontal, they are directed from the starting end side of the rice milling chamber 30 toward the milled rice discharge port 34. The installation structure may be arranged horizontally so as to provide an inclination.

  The milled rice part 4 includes a cylindrical stirring roll 32 that mills brown rice a into polished rice b, and a regular hexagonal cylindrical stripping net 80 that houses the stirring roll 32. The substantial rice milling chamber 30 is formed by the space formed between the dehulling net 80 and the stirring roll 32. In this way, by making the dehulling net 80 into a polygonal shape, it becomes possible to generate a rice milling pressure in the rice milling chamber 30 composed of the stirring roll 32 and the demining net 80.

  In addition, the cylindrical stirring roll 32 is provided with a pair of gate-shaped protrusions 32a that extend in a protruding manner in the longitudinal direction of the roll. The protrusion 32 a of the stirring roll 32 is provided with an air outlet 32 b that blows out air supplied from the air pump 13 on the side opposite to the rotation direction, and the air outlet 32 b communicates with the inside of the stirring roll 32. ing. The stirring roll 32 is formed thick so as to have an elliptical shape when viewed from the front.

  The stripping net 80 is composed of two nets having a shape obtained by dividing a substantially hexagonal cylinder in a sectional view into two halves along the longitudinal direction. In the inner wall 81 of the dehulling net 80, a large number of substantially hemispherical raised portions (not shown) are formed to remove the rice cake from the brown rice, and a number of through holes 86 are formed to allow the rice cake removed from the brown rice to pass therethrough. It is installed. On the outer wall side of each mesh body, a reinforcing body 89 for reinforcing each mesh body is continuously provided.

  Although the stripping net 80 is substantially hexagonal in sectional view, it is not limited to these shapes, and may be other polygonal shapes such as substantially octagonal, heptagonal, and pentagonal in sectional view.

  The proximal end side of the stirring roll 32 is concentrically connected to the distal end side of the conveying screw 11, and when the drive shaft 21 rotates, the conveying screw 11 and the stirring roll 32 rotate integrally.

  As shown in FIGS. 3 to 5, a pair of gate-shaped protrusions 32 a and 32 a (see FIG. 1) are provided on the outer peripheral surface of the stirring roll 32 in the axial direction. The stirring roll 32 on the base end side of the ridge 32a is formed with an outlet 32b through which air supplied from the air pump 13 is blown. A communication hole 14 communicating with each other is formed in the center of the drive shaft 21, the conveying screw 11, and the stirring roll 32 described above, and the air supplied from the air pump 13 is passed through the communication hole 14, so that the stirring roll Air is blown out from the air outlet 32b provided on the peripheral surface of the air.

  Further, plate-shaped restricting portions 39 and 39 having a 1/4 arc in the circumferential direction are provided on the circumferential surface of the stirring roll 32.

  That is, each restricting portion 39 is formed to extend from the side portion 32c (left side portion in front view in FIG. 4) in the center of the stirring roll 32 in the longitudinal direction of the roll and in the rotational direction of the gate-shaped protrusion 32a. Yes. Specifically, the restricting portion 39 is provided at a position having a length of 1/3 to 1/2 of the roll longitudinal direction from the base end side of the stirring roll 32 and on the side portion 32c in the rotational direction of the protrusion 32a. In addition, the width | variety of the control part 39 may be several cm width, for example, and may be the width | variety of the length to 1/3 position-1/2 position of a roll longitudinal direction.

  Each restricting portion 39 has a tip portion that is tapered in front view. Further, the length of the restricting portion 39 is about ¼ of the circumference of the stirring roll 32, and the height thereof is set lower than the height of the protrusion 32a. In particular, the height H2 of the restricting portion 39 is set to ½ or more and 2/3 or less of the height H1 of the protrusion 32a. That is, when it is less than ½ of the height H1 of the protrusion 32a, the load on the rice is insufficient. On the other hand, when it is higher than 2/3 of the height H1 of the protrusion 32a, the load on the rice is overloaded.

  As shown in FIGS. 5 and 6, when the brown rice is horizontally transported from the transport unit 3 into the milled rice chamber 30, the speed (arrow d 1) of the brown rice moving around the stirring roll 32 is adjusted by the regulating unit 39. By restricting the movement toward the white rice discharge port 34, the speed is reduced (arrow d2), which is the same speed as the speed of the brown rice (arrow d3) moving on the inner wall 81 side of the debris net 80.

  That is, the density of the brown rice on the peripheral surface of the stirring roll 32 and the inner wall 81 side of the debris net 80 becomes uniform, and as a result, the brown rice that moves on the peripheral surface of the stirring roll 32 moves on the inner wall 81 side of the demineralization net 80. The whiteness of the polished rice is the same as that of the brown rice, and the unevenness of the polished rice can be reduced.

  In addition, in the rice milling chamber 30 on the side of the transfer chamber 12 with the restriction part 39 of the stirring roll 32 as a boundary, the action of separating rice bran from brown rice is higher than that of the conventional apparatus, and the rice cake separated from the white rice is restricted by the restriction part 39. In the rice milling chamber 30 on the side of the milled rice discharge port 34, the rice cake is blown off to the side of the debris net 80 by the air blown from the blowout port 32b and is discharged from the through hole 86 to the collecting case 33. The white rice is conveyed to the milled rice discharge port 34 and discharged. In the conventional apparatus, the powdered rice cake is sometimes discharged together with the white rice from the polished rice discharge port 34, but by providing the regulating portion 39, the function of separating the rice cake from the brown rice and discharging the rice cake outside the device. The action of extracting the white rice from the polished rice discharge port 34 can be effectively performed.

  A circular milled rice discharge port 34 for discharging the polished rice b is formed on the terminal side of the scouring net 80, and the polished rice discharge port 34 is closed by a lid 40 of the white rice discharge mechanism 5 described later. Is biased in the direction.

  As shown in FIGS. 1 and 2, the white rice discharge mechanism 5 includes a lid 40 that is detachably disposed at a polished rice discharge port 34 formed at one end of a cylindrical rice milling portion 4, and this lid. And a biasing support arm 41 that biases the lid body 40 in a direction to block the milled rice discharge port 34 against the milled rice pressure while rotatably supporting the center of the body 40. Yes.

  The lid 40 is formed in a disc shape, and the central portion 40a of the lid 40 is pivotally supported so as to be rotatable. In other words, the lid 40 is pivotally supported by the end 44a of the L-shaped urging support arm main body 44, which will be described later, through a ball joint.

  Further, cylindrical projections 44 b and 44 b are formed in the left and right direction at the base end of the urging support arm main body 44. The urging support arm main body 44 is configured such that both protrusions 44b and 44b are pivotally supported by a pair of concave pivot portions 45a and 45a at the tip of the support frame 45. The base end portion of the support frame 45 is disposed on a step portion 31 a provided in the machine casing 31 at the upper front portion of the rice milling portion 4.

  Further, the urging support arm 41 includes an urging unit main body 42 that applies an urging force to the base end portion of the urging support arm main body 44 via the connecting plate 47, and the urging unit main body 42 includes a bar 46. And an elastic spring 48 inserted through and a known expansion / contraction device that makes the rod 46 extendable back and forth. The tip end side of the rod 46 is inserted into a long hole (not shown) of the connecting plate 47. The urging unit main body 42 is disposed on the machine casing 31 of the rice milling unit 4.

  That is, in the rice milling chamber 30, the milled rice pressure (milling pressure) acts on the brown rice a by the conveying force by the conveying screw 11 and the contact pressure by the lid body 40 against the conveying force by the conveying screw 11, By the mutual contact pressure and contact frictional force, the straw layer c is removed from the brown rice a before reaching the polished rice discharge port 34.

  The contact pressure applied to the lid 40 can be adjusted by the urging force generated in the urging unit main body 42. Specifically, when the rod 46 is extended by the biasing portion main body 42, the elastic spring 48 inserted through the rod 46 is contracted, and this biasing force is applied to the connecting plate 47, and the biasing support arm is connected via the connecting plate 47. The base end portion 44c of the main body 44 is pressed, and the urging support arm main body 44 swings with the projections 44b and 44b as fulcrums, so that the lid 40 at the tip of the urging support arm main body 44 is discharged from the polished rice. It is urged to be pressed by the outlet 34. That is, in the lid 40, the point of application for receiving the urging force is in the center, and the entire periphery of the lid 40 is pressed against the entire periphery of the polished rice discharge port 34 with the same pressing density.

[Rice milling process with horizontal rice mill]
A rice milling process using a horizontal rice mill will be described.

  As shown in FIG. 1, the brown rice a stored in the brown rice supply unit 2 is supplied to the brown rice supply cylinder 10 and conveyed to the conveyance unit 3. The brown rice a transported into the transport chamber 12 of the transport unit 3 is transported to the rice milling chamber 30 of the rice milling unit 4 provided in a horizontal direction by the rotational drive of the transport screw 11.

  The brown rice conveyed to the milled rice chamber 30 moves to the milled rice discharge port 34 while being stirred by the protrusions 32a and 32a of the rotating stirring roll 32. That is, the polished rice pressure (milling pressure) acts on the brown rice a by the conveying force by the conveying screw 11 and the contact pressure by the lid body 40 against the conveying force. The rice bran layer c is removed from the brown rice a by the contact pressure and the contact frictional force until reaching the milled rice outlet 34. That is. The urging force generated by the urging portion main body 42 in the urging support arm 41 is applied to the lid body 40 via the urging support arm main body 44.

  At this time, in this rice milling apparatus 1, as shown in FIG. 5, the brown rice is gradually crushed from the lower half of the rice mill 30 to the apex of the upper half by the stirring roll 32 rotating counterclockwise. While being wound counterclockwise, as shown in FIG. 6, the speed of the brown rice (arrow d 1) moving on the circumferential surface of the stirring roll 32 is restricted by the restricting portion 39 from moving toward the polished rice discharge port 34. As a result, the speed is reduced (arrow d2), which is about the same speed as the speed of the brown rice (arrow d3) moving on the inner wall 81 side of the screen 80. That is, when the density of the milled rice is uniform between the peripheral surface of the stirring roll 32 and the inner wall 81 side of the debris net 80, the milled rice whiteness is uniformed and the milled rice unevenness is reduced.

  On the other hand, the rice cake c peeled off from the brown rice a passes through the through-hole 86 provided in the rice removal net 80 together with the broken rice and is discharged to the outside from the lower side of the rice milling chamber 30 (see FIG. 2).

  The milled rice in the upper half of the milled rice chamber 30 and the milled rice in the lower half that have reached the milled rice discharge port 34 push the lid 40 against the biasing force of the biasing support arm 41, It is discharged from the discharge port 34. The polished rice b that has reached the polished rice discharge port 34 is discharged from a gap s formed by the lower half of the lid 40 and the lower half of the polished rice discharge port 34, slides down on the chute 36, and is stored in a container. The

  In addition, although the urging part main body 42 which generates urging force in the white rice discharge mechanism 5 of the rice milling apparatus 1 is provided in the step part 31a at the front upper part of the rice milling part 4, a new horizontal direction is formed in the front part of the rice milling room 30. A machine frame may be provided continuously, and the urging unit main body may be provided on the machine frame.

[Other shapes of restriction part]
Other shapes of the restricting portion 39 provided on the stirring roll 32 will be described with reference to FIGS.

  As shown in FIG. 6, the shape of the restricting portion 39 is formed in a triangular shape in cross section, and by using such a shape, the speed of the brown rice moving in the longitudinal direction on the circumferential surface of the stirring roll 32 is reduced. Thus, the speed can be set to the same speed as that of the brown rice moving on the inner wall 81 side of the dehulling net 80. Therefore, the polished rice whiteness of the brown rice that moves on the peripheral surface of the stirring roll 32 and the brown rice that moves on the inner wall 81 side of the dehulling net 80 becomes approximately the same, and unevenness of the polished rice can be reduced.

  Moreover, the shape of the restricting portion 39 may be a semicircular arc shape in cross section or a crescent shape in cross section.

  The restricting portion 39 may be formed by build-up welding, and is not limited to the shape described above.

  Moreover, you may make it arrange the some control part 39-1 and 39-2 in the longitudinal direction position of each protrusion 32a of the stirring roll 32 in parallel. That is, as shown in FIGS. 7 and 8, the restricting portions 39-1 and 39-2 are arranged in parallel at predetermined intervals on the side portion 32c in the rotational direction of the protrusion 32a of the stirring roll 32. Specifically, one restricting portion 39-1 is located at a position X1 having a length of 1/3 to 1/2 of the longitudinal direction from the proximal end side of the stirring roll 32 and on the side portion in the rotational direction of the protrusion 32a. The other regulating portion 39-2 is provided at a position X2 having a length of 20 mm to 30 mm from the tip end side of the stirring roll 32 and on the side portion 32c in the rotation direction of the protrusion 32a.

When the regulating portion 39-1 is located at a length position X1 of less than 1/3 of the longitudinal direction from the base end side of the stirring roll 32, the portion for performing the rice milling process is reduced, resulting in insufficient rice milling. When the restriction part 39-1 is at a length position X1 longer than ½ of the longitudinal direction from the base end side of the stirring roll 32, the part that performs the rice milling process increases and the part that performs the grading process decreases. It becomes defective. When the regulation part 39-2 is at a length position X2 of less than 20 mm from the tip end side of the stirring roll 32, the load on the rice is overloaded. When the restricting portion 39-2 is at a length position X2 longer than 30 mm from the tip end side of the stirring roll 32, the portion where the grading process is performed is reduced, resulting in gradual failure.

  When the brown rice is transported from the transport unit 3 into the milled rice chamber 30, the speed of the brown rice moving on the circumferential surface of the stirring roll 32 (arrow d1) is controlled by the regulating units 39-1 and 39-2. By restricting the movement toward the front, it is decelerated to a speed (arrow d2), which is the same speed as the speed of the brown rice (arrow d3) moving on the inner wall 81 side of the debris net 80 (see FIG. 5).

  As a result, the polished rice whiteness of the brown rice that moves on the peripheral surface of the stirring roll 32 and the brown rice that moves on the inner wall 81 side of the dehulling net 80 becomes the same level, and unevenness of the polished rice can be reduced.

  In addition, in the rice milling chamber 30 on the side of the transfer chamber 12 with the one regulating portion 39-1 of the stirring roll 32 as a boundary, the action of separating rice bran from brown rice is higher than that of the conventional apparatus, and the rice koji separated from white rice is used. Passes over the restricting section 39-1, and in the milled rice chamber 30 on the milled rice discharge port 34 side, the rice cake is blown off to the side of the debris net 80 by the air blown out from the blower outlet 32b, and the collecting case 33 from the through hole 86. On the other hand, the white rice is conveyed to the milled rice discharge port 34 side and discharged. In the conventional vertical apparatus, the powdered rice cake was sometimes discharged together with the white rice from the polished rice discharge port 34. By providing the other regulating portion 39-2, the function of separating the rice cake from the brown rice, The action of taking out white rice from the milled rice outlet 34 while discharging the rice to the outside of the apparatus can be effectively performed.

  In addition, you may make it the restriction | limiting part 39-1 and 39-2 arranged in parallel differ in each height. For example, the height of the regulating portion 39-1 on the transfer chamber 12 side may be set high, and the height of the regulating portion 39-2 on the polished rice discharge port 34 side may be set low.

  Further, in the stirring roll 32 shown in FIG. 9, the two regulating portions 39-1 and 39-2 are provided in the circumferential direction of the stirring roll 32 and the stirring roll 32 in the same manner as the stirring roll 32 shown in FIG. The stirring roll 32 is provided around the stirring roll 32 in the tangential direction, and the regulating portions 39-1 and 39-2 are disposed on the stirring roll 32 so as to form an acute angle with respect to the axial direction of the stirring roll 32.

  That is, the restricting portions 39-1 and 39-2 are arranged so as to form an angle of about 15 ° with respect to the circumferential direction of the stirring roll 32.

  By comprising in this way, it becomes possible to make it act so that the brown rice contact | abutted near the front-end | tip vicinity of the control part 39-1 and 39-2 may be returned to the base end side.

  The above-described stirring roll 32 with the restriction portions 39, 39-1 and 39-2 can also be applied to a vertical rice milling apparatus which will be described later.

[Vertical rice milling equipment]
A vertical rice mill will be described with reference to FIG. The vertical rice milling apparatus has the same basic configuration as the horizontal rice milling apparatus, and the difference is that the feeding direction of the brown rice in the rice milling section is changed from the horizontal direction to the vertical direction. The vertical rice milling apparatus includes a rice milling unit on the upper side of the conveying unit and a reverse one, and only the former will be described.

  As shown in FIG. 10, the vertical rice milling apparatus includes a brown rice supply unit 2 that stores the brown rice a, a first transfer unit 3a that horizontally transfers the brown rice a from the brown rice supply unit 2, and the first transfer unit 3a. The second transfer unit 3b that vertically transfers the brown rice a transferred from the rice and the rice polishing unit that is connected to the second transfer unit 3b and that polishes the brown rice that has been fed from the second transfer unit 3b with a predetermined milling pressure. 4 and a polished rice discharge mechanism 5 having a function of adjusting the polished rice pressure while discharging the polished rice from the polished rice portion 4.

  The brown rice supply unit 2 includes a hopper unit 6 that supplies the stored brown rice a to the first transport unit 3a. At the center of the bottom of the hopper 6, a short brown rice supply cylinder 10 having a brown rice supply port is provided so as to protrude downward. The brown rice supply cylinder 10 is connected to the ceiling part of the 1st conveyance part 3a.

  The 1st conveyance part 3a is comprised as a screw feeder, and the 1st conveyance screw 11a which supplies the fixed amount of brown rice a stored in the hopper part 6 to the 2nd conveyance part 3b stably, and a 1st conveyance screw And a first transfer chamber 12a in which 11a is rotatably housed. The first conveying screw 11a is disposed horizontally in the first conveying chamber 12a disposed below the hopper 6 so that the axial direction coincides with the lateral direction.

  The first transfer chamber 12a is configured in a cylinder concentric with the first transfer screw 11a, and has a supply port on the axially proximal end side of the first transfer screw 11a and on the ceiling side of the casing of the first transfer chamber 12a. 10a is formed. A brown rice discharge port opened at the center of the bottom of the hopper 6 communicates with and is opposed to the supply port 10a, and the brown rice a in the hopper falls into the transfer chamber 12a through the supply port 10a. Supplied.

  A first drive shaft 21a is interlocked and connected to the base end of the first conveying screw 11a. The first drive shaft 21a is rotatably supported by the first bearing portion 22a and is connected to the first passive pulley 28a. It is configured to do.

  That is, the first conveying screw 11a is cantilevered by the first drive shaft 21a, and the driving force from the first motor unit 24a as the power unit provided below the first conveying unit 3a is the first driving screw 21a. The power is transmitted through the pulleys 26a and 28a connected to the first output shaft 25a of the motor unit 24a, and is rotated about the axis. A first belt 27a for transmitting power from the first output shaft 25a is suspended between the first drive pulley 26a and the first passive pulley 28a.

  The 2nd conveyance part 3b for conveying the brown rice conveyed from the 1st conveyance chamber 12a mounted in the horizontal direction to a perpendicular direction is demonstrated.

  The 2nd conveyance part 3b is comprised as a screw feeder similarly to the 1st conveyance part 3a, and supplies the fixed amount of brown rice a horizontally conveyed from the 1st conveyance chamber 12a to the rice milling part 4 of a perpendicular direction stably. A second transfer screw 11b and a second transfer chamber 12b that accommodates the second transfer screw 11b so as to be rotatable are provided. The second conveying screw 11b is arranged vertically in the second conveying chamber 12b arranged on the side of the first conveying unit 3a so that the axial direction thereof coincides with the vertical direction.

  The second transfer chamber 12b is configured in a cylinder concentric with the second transfer screw 11b.

  A second drive shaft 21b is linked to the base end of the second conveying screw 11b. The second drive shaft 21b is rotatably supported by the upper and lower bearing portions 23a and 23b and the second passive pulley 28b is provided. It is configured to be connected.

  That is, the second conveying screw 11b is supported at both ends by the second drive shaft 21b, and the driving force from the second motor unit 24b as the power unit provided on the back of the first conveying unit 3a is the second conveying screw 11b. The power is transmitted through the pulleys 26b and 28b connected to the second output shaft 25b of the motor unit 24b to rotate around the axis. A second belt 27b for transmitting power from the second output shaft 25b is suspended between the second drive pulley 26b and the second passive pulley 28b.

  In addition, you may make it adjust the quantity of the brown rice a discharged | emitted from the brown rice discharge port of the bottom part of the hopper part 6 with a shutter, or by adjusting the rotation speed of the conveyance screw 11, from the brown rice supply part 2 You may make it adjust the supply amount of the brown rice a supplied.

  The milled rice part 4 includes a cylindrical stirring roll 32 that mills brown rice a into polished rice b, and a regular hexagonal cylindrical stripping net 80 that houses the stirring roll 32. The substantial rice milling chamber 30 is formed by the space formed between the dehulling net 80 and the stirring roll 32. In this way, by making the dehulling net 80 into a polygonal shape, it becomes possible to generate a rice milling pressure in the rice milling chamber 30 composed of the stirring roll 32 and the demining net 80.

  In addition, the cylindrical stirring roll 32 is provided with a pair of portal-shaped protrusions 32a extending in a protruding shape in the longitudinal direction. When the suction type air pump is operated, the ridge 32a of the stirring roll 32 opens a blower outlet 32b for blowing out the air sucked from the opening 50 at the upper part of the rice milling part on the side opposite to the rotation direction. The air outlet 32 b communicates with the inside of the stirring roll 32. The stirring roll 32 is formed thick so as to have an elliptical shape when viewed from the front.

  The stripping net 80 is composed of two nets having a shape obtained by dividing a substantially hexagonal cylinder in a sectional view into two halves along the longitudinal direction. A large number of substantially hemispherical raised portions are formed in the inner wall 81 of the dehulling net 80 to remove the rice cake from the brown rice, and a number of through holes 86 are formed to allow the rice cake removed from the brown rice to pass therethrough. .

  The proximal end side of the stirring roll 32 is concentrically connected to the distal end side of the second transport screw 11b, and when the second drive shaft 21b rotates, the second transport screw 11b and the stirring roll 32 rotate integrally. It will be.

  On the outer peripheral surface of the stirring roll 32, a pair of gate-shaped protrusions 32a and 32a are provided in the axial direction (see FIG. 7). The protrusion 32a is formed with an outlet 32b through which air supplied from the opening 50 at the upper part of the milled rice is blown out by suction with a suction type air pump. In the center of the second drive shaft 21b and the agitating roll 32 described above, communication holes 14 communicating with each other are formed. By suctioning with a suction type air pump, the communication holes 14 are supplied from the opening 50. The air is allowed to pass through, and the air is blown out from the air outlet 32b provided on the peripheral surface of the stirring roll 32.

  Further, plate-shaped restricting portions 39, 39 having a ¼ arc in the circumferential direction are provided on the circumferential surface of the stirring roll 32.

  That is, one regulating portion 39-1 is formed to extend from the side portion 32c (the left side portion in the front view in the figure) in the rotation direction of the gate-shaped protrusion 32a at the center position in the longitudinal direction of the stirring roll 32. ing. The other restricting portion 39-2 is formed to extend from the side end 32c in the longitudinal direction of the stirring roll 32 and from the side portion 32c in the rotational direction of the gate-shaped ridge 32a (left side portion in front view in the figure). ing.

  Moreover, the front-end | tip part of the control parts 39-1 and 39-2 is formed in the front view taper shape. Furthermore, the lengths of the regulating portions 39-1 and 39-2 are about 1/4 of the circumference of the stirring roll 32, and the height thereof is set lower than the height of the protrusion 32a.

  When the brown rice is transported from the transport unit 3 into the milled rice chamber 30, the speed of the brown rice moving on the circumferential surface of the stirring roll 32 (arrow d1) is controlled by the regulating units 39-1 and 39-2. By restricting the movement toward the direction, it is decelerated to a speed (arrow d2), which is about the same speed as the speed of the brown rice (arrow d3) moving on the inner wall 81 side of the screen 80.

  As a result, the polished rice whiteness of the brown rice that moves on the peripheral surface of the stirring roll 32 and the brown rice that moves on the inner wall 81 side of the dehulling net 80 becomes the same level, and unevenness of the polished rice can be reduced.

  In addition, in the rice milling chamber 30 on the side of the transfer chamber 12 with the one regulating portion 39-1 of the stirring roll 32 as a boundary, the action of separating rice bran from brown rice is higher than that of the conventional apparatus, and the rice koji separated from white rice is used. Passes over the regulating portion 39-1, and in the milled rice chamber 30 on the milled rice discharge port 34 side, the rice cake is blown off to the side of the debris net 80 by the air blown out from the blower outlet 32b, and the collecting case 33 is passed through the through hole 86. On the other hand, the white rice is conveyed to the milled rice discharge port 34 side and discharged. In the conventional vertical apparatus, the powdered rice cake was sometimes discharged together with the white rice from the polished rice discharge port 34. By providing the other regulating portion 39-2, the function of separating the rice cake from the brown rice, The action of taking out white rice from the milled rice outlet 34 while discharging the rice to the outside of the apparatus can be effectively performed.

  A milled rice discharge port 34 for discharging the milled rice b is formed on the terminal side of the debris net 80. The milled rice discharge port 34 is closed in a direction to be closed by a lid body 40 of the milled rice discharge mechanism 5 described later. It is energized.

  As shown in FIG. 10, the white rice discharge mechanism 5 includes a lid 40 that is detachably disposed on a milled rice discharge port 34 formed on the upper end side of the rice milling portion 4 formed in a cylindrical shape, and the lid 40. And an urging support arm 41 that urges the lid 40 in a direction to close the milled rice discharge port 34 against the milled rice pressure. A weight 49 is attached to the distal end side of the urging support arm 41, and the urging force to the lid body 40 can be changed by increasing the weight 49.

  That is, in the rice milling chamber 30, the milled rice pressure (milling pressure) acts on the brown rice a by the conveying force by the conveying screw 11 and the contact pressure by the lid body 40 against the conveying force by the conveying screw 11, By the mutual contact pressure and contact frictional force, the straw layer c is removed from the brown rice a before reaching the polished rice discharge port 34.

  The contact pressure applied to the lid 40 can be adjusted by the biasing force generated by the weight of the weight 49 of the biasing support arm 41. Specifically, the urging support arm 41 is pivoted about the pivot portion on the proximal end side so that the lid 40 on the proximal end side of the urging support arm 41 is pressed against the polished rice discharge port 34. Will be energized. That is, in the lid 40, the action point that receives the urging force is at the top, and the entire periphery of the lid 40 is pressed against the entire periphery of the polished rice discharge port 34 with the same pressing density.

[Rice milling process with vertical rice mill]
The rice milling process by the vertical rice mill will be described.

  The brown rice a stored in the brown rice supply unit 2 is supplied to the brown rice supply cylinder 10 and transferred to the first transfer unit 3a. The brown rice a that has been transferred into the first transfer chamber 12a of the first transfer unit 3a is transferred to the second transfer unit 3b that is continuously provided in the lateral direction by the rotational drive of the first transfer screw 11a. The brown rice a conveyed in the second conveyance chamber 12b of the second conveyance unit 3b is conveyed to the rice milling chamber 30 of the rice milling unit 4 provided continuously in the vertical direction by the rotational drive of the second conveyance screw 11b.

  The brown rice conveyed to the milled rice chamber 30 moves to the milled rice discharge port 34 while being stirred by the protrusions 32a and 32a of the rotating stirring roll 32. That is, to the brown rice in the milled rice chamber 30, the milled rice pressure (milling pressure) acts on the brown rice a by the transport force by the second transport screw 11 b and the contact pressure by the lid body 40 against the transport force. The rice bran layer c is removed from the brown rice a by the contact pressure and the contact friction force between the rice grains before reaching the polished rice discharge port 34. That is. A biasing force generated by the weight at the tip of the biasing support arm 41 is applied to the lid body 40.

  At this time, in the present rice milling apparatus 1, the brown rice in the milling chamber 30 is pushed up counterclockwise while being gradually slowed down by the stirring roll 32 rotating counterclockwise. As shown in FIG. 6, the speed (arrow d1) of the brown rice moving on the peripheral surface of the stirring roll 32 is decelerated by the restriction portion 39 restricting the movement toward the milled rice discharge port 34, and the speed (arrow) d2), which is about the same speed as the speed of the brown rice moving on the inner wall 81 side of the debris net 80 (arrow d3). That is, when the density of the milled rice is uniform between the peripheral surface of the stirring roll 32 and the inner wall 81 side of the debris net 80, the milled rice whiteness is uniformed and the milled rice unevenness is reduced.

  On the other hand, the rice cake c peeled off from the brown rice a passes through the through-hole 86 provided in the rice removal net 80 together with the broken rice, and is discharged to the outside from the rice milling chamber 30 (see FIG. 10).

  The milled rice in the milled rice chamber 30 that has reached the milled rice outlet 34 is discharged from the milled rice outlet 34 by pushing the lid 40 against the biasing force of the biasing support arm 41. The polished rice b that has reached the polished rice discharge port 34 is discharged from a gap formed by the lower half of the lid 40 and the lower half of the polished rice discharge port 34, slides down on the chute 36, and is stored in a container. .

  Note that vertical rice milling devices include those having a rice milling unit on the upper side of the conveying unit and those having the reverse. That is, even if it has a structure which has a conveyance part above a rice milling part, there exists the same effect mentioned above.

  Although the present invention has been described through each embodiment, the present invention is not limited to each embodiment, and the shape of each component and the layout of the apparatus are within the scope of the claims. Etc. can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Rice milling apparatus 2 Brown rice supply part 3 Conveying part 4 Rice polishing part 5 White rice discharge mechanism 10 Brown rice supply cylinder 11 Conveying screw 12 Conveying chamber 13 Air pump 14 Communication hole 15 Channel 21 Drive shaft 22 Bearing part 24 Motor part 30 Rice milling room 32 Stirring Roll 33 Collecting case 34 Milled rice discharge port 40 Lid 80 Removal net 81 Inner wall

Claims (5)

A transport unit for transporting brown rice;
A rice milling unit that is connected to the transporting unit and polishes the brown rice transported from the transporting unit at a predetermined milling pressure between a cylindrical stirring roll and a cylindrical stripping net that houses the stirring roll. ,
In the rice milling machine equipped with
On the peripheral surface of the stirring roll, there are formed a ridge extending in a protruding shape in the roll longitudinal direction and a regulating portion that extends along the roll peripheral surface from the middle of the ridge to regulate the movement of brown rice. A rice milling device characterized by that.   The rice milling apparatus according to claim 1, wherein the height of the restricting portion is lower than the height of the protrusion.   The said control part is provided with two or more by the surrounding surface of the said stirring roll, The rice milling apparatus of Claim 1 or Claim 2 characterized by the above-mentioned.   The rice milling apparatus according to any one of claims 1 to 3, wherein the rice milling unit performs rice milling while feeding the fed brown rice in a horizontal direction.   The rice milling apparatus according to any one of claims 1 to 3, wherein the rice milling unit performs rice milling while feeding the conveyed brown rice in a vertical direction.

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