JP2019193935A - Rice polishing machine - Google Patents

Abstract

To provide a rice polishing machine capable of accurate rice polishing control not influenced by environments including rice brand and the amount of rice being polished.SOLUTION: A rice polishing machine comprises driving means which is driven in response to starting operation of rice polishing and control means for controlling operation of the driving means. The control means is configured so that the driving means is operated at a first rotating speed N1 for a first time T1 when a peak value of a current flowing to the driving means is detected, and after elapse of the first time T1, the driving means is operated at a second rotating speed N2 for a second time T2. The rice polishing machine further comprises a storage unit for prestoring combinations of the first time T1, the second time T2, and the first rotating speed N1 and the second rotating speed N2 in accordance with rice brands and amounts of rice polishing, and the first time T1 and the second time T2 are set with the relationship of T2>T1.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a rice mill.

  In Patent Document 1, in order to solve problems such as poorness of rice breakage at the time of milling, deterioration of rice taste caused by temperature rise of rice due to generation of frictional heat, troublesome maintenance of rice cake and rice clogging. A tabletop rice mill for home use is disclosed.

The rice milling machine includes a motor as driving means, a rice milling blade that is fitted to a driving shaft that rotates in accordance with the rotation of the motor and rotates together with the driving shaft, and a cylindrical peripheral portion that is concentric with the driving shaft. A rice mill having a circular bottom and containing the rice milling blades, a lid that covers the upper opening of the rice mill and having a transparent part, and a re-roller for rotating the motor to perform rice milling after the rice milling is completed. It is configured with a milled rice button.

  And the side peripheral part of the said polished rice basket is comprised with a wire mesh, and at the time of polished rice, brown rice is stirred by rotation of the polished rice blade by putting the brown rice in the polished rice basket and rotating the motor. The rice bran is scraped off by rubbing it on the wire mesh of the side periphery of the polished rice basket, and the scraped rice cake is blown outward from the mesh.

JP 2000-24527 A

By the way, in the existing rice milling technology, the rotation speed of the driving means is switched only on the basis of the passage of time, but for example, depending on the storage condition of brown rice and the environmental conditions such as the brand at the time of milling and the amount of milled rice, only time control is performed. In some cases, however, the finished state of the polished rice could vary greatly.

In view of the above-described conventional problems, an object of the present invention is to provide a rice milling machine capable of highly accurate rice milling control that is not affected by the environment including the brand and the amount of rice polishing .

In order to achieve the above-mentioned object, a first characteristic configuration of a rice mill according to the present invention includes a drive unit that is driven in response to a start operation of the rice mill, and a control unit that controls the operation of the drive unit. When the control unit detects a peak value of a current value flowing through the driving unit, the control unit operates the driving unit at a first rotation speed N1 for a first time T1, and after the first time T1 has elapsed, the driving unit Is configured to operate at the second rotation speed N2 for the second time T2 .

When the driving means is activated and the squeezing is started, the load is initially high and the current increases. It is determined that the time when the current shows a peak value is the time when the load for squeezing is maximized, and then setting the first rotation speed and the first rotation time, while avoiding cracking of rice Stable rice milling control can be realized. Most of the soot layer is scraped off during the first rotation time when the driving means is driven at the first rotation speed.

In addition to the first feature configuration described above, the second feature configuration includes the first time T1, the second time T2, and the first rotation speed according to the brand of rice and the amount of polished rice. The storage unit further stores a combination of N1 and the second rotation speed N2 in advance, and the first time T1 and the second time T2 are set such that T2> T1 .

The driving means is driven based on the first time T1, the second time T2, the first rotation speed N1, and the second rotation speed N2 stored in advance in the storage unit according to the rice brand and the amount of polished rice. By doing so, it will be properly refined according to the brand of rice and the amount of polished rice.

The third characteristic configuration is that, in addition to the second characteristic configuration described above, the first rotational speed N1 and the second rotational speed N2 are set to satisfy a relationship of N1 ≧ N2 .

The drive means is driven for a time T2 at a second rotation speed N2 lower than the first rotation speed N1, so that the drive means is uniformly refined.

As described above, according to the present invention, it has become possible to provide a rice milling machine capable of highly accurate rice milling control independent of the environment including the brand and the amount of rice polishing .

(A) is a longitudinal sectional view of a rice mill, (b) is a sectional view of a rice mill. (A) is a plan view of a rice mill according to the present invention, (b) is a side view thereof, and (c) is a perspective view thereof. (A) is a plan view of a polished rice basket, (b) is the same side surface, (c) is the same perspective view. Side view of the main part with the outer cover of the rice mill removed Explanatory drawing of rotational drive mechanism of rice milling machine (A)-(d) is explanatory drawing of a stirring member (A)-(c) is explanatory drawing of an extending member (A), (b) is explanatory drawing of the processus | protrusion which shows another embodiment. (A)-(c) is explanatory drawing of the extension member of another shape Another embodiment of a polished rice basket is shown, (a) is a perspective view of a polished rice basket provided with a gripping part, (b) is a plan view thereof, and (c) is a sectional view taken along line AA in FIG. 14 (b). (A), (b) is explanatory drawing of the attachment state of a support plate and a circuit board provided with the power transmission mechanism Illustration of the electrical circuit that drives the rice mill Timing chart of motor drive control by controller Flow chart of motor drive control by control unit The flowchart of the motor drive control by a control part which shows another embodiment

Below, an example of the rice mill which comprises this invention is demonstrated based on drawing.
1A and 1B show cross-sectional structures of the rice mill 1 and the rice basket 3, respectively, and FIGS. 2A to 2C show the appearance of the rice mill 1. FIG.

  A rice mill 1 includes a rice bran container 2 for collecting rice bran separated from rice, a bottomed cylindrical rice mill 3 provided inside the rice bran container 2, and a rotating shaft 4 penetrating the rice bran container 2 and the rice mill 3 And a stirring member 5 that is rotatably attached to the rotary shaft 4 and scours the rice put into the polished rice basket 3 is detachably accommodated in a bottomed cylindrical casing A.

  The casing A is formed in an oval shape in plan view, and is provided with a lid B that opens and closes an opening A1 for putting rice into the polished rice basket 3 accommodated in the casing A. A plurality of operation buttons C are disposed on the upper surface of the casing A at the side of the lid B, and a control board CB1 is disposed below the operation buttons C.

  The control board CB1 is equipped with a microcomputer that drives a motor M, which will be described later, in accordance with an operation on the operation button C and controls the rice milling time and / or the rotational speed, and its peripheral circuits.

  As operation buttons C, a rice milling button C1, a rice milling amount setting button C2, a rice milling degree setting button C3, and a brand selection button C4 for starting a rice milling operation are provided. The milled rice amount setting button C2 is used to set the milled rice amount from 1 to 5, and the milled rice setting button C3 is used to set the milling degree in five stages, and the brand selection button C4 is used to set the brand. .

  Four brands and other brands can be selected by the brand selection button C4. When other brands are selected, the selection of the rice milling degree setting button C3 becomes valid and the brand is selected. Regardless of the setting of the rice milling degree setting button C3, the rice milling is configured to be milled to an optimum degree of rice milling set in advance.

  A display device D composed of a plurality of LEDs corresponds to each button so that the setting state or selection state can be visually confirmed corresponding to each of the milling amount setting button C2, the milling degree setting button C3, and the brand selection button C4. Are arranged.

  The optimum rice milling time and / or rotational speed for each brand and each rice milling amount is obtained in advance by experiments or the like, and the values are stored in a memory provided on the control board CB1. When a specific brand is selected, the rice milling time and / or rotation speed for the brand is read from the memory and controlled.

  The optimal rice milling time and / or rotational speed is the rice milling degree that is set on the basis of the degree of rice milling and whiteness and gives a preferable taste for each brand, and the rice milling time and rotational speed at which a desirable whiteness is obtained. The setting standard for the rice milling time and the rotation speed is not limited to the taste or whiteness of each brand, and other factors may be added.

As shown in FIGS. 1A, 4, and 5, a motor M as a driving unit is accommodated in the casing A on the side of the container 2, and the rotating shaft 4 rotates via the power transmission mechanism 10. It is configured to be driven. A drive pulley P1 fitted to the output shaft 11 of the motor M, a drive transmission shaft 12 connected to the rotary shaft 4 via a coupler 40, a driven pulley P2 fitted to the drive transmission shaft 12, A power transmission mechanism 10 is constituted by a belt 13 connecting the pulleys P1 and P2.

  Fins F are provided on the lower surface side of the driving pulley P1, and are configured to suck outside air when the motor M rotates to cool the inside of the apparatus in which the motor M, the control circuit board, and the like are arranged. In addition, when the temperature of rice rises due to friction during rice milling, the taste may be lowered. Therefore, the rice may be cooled by forming an air passage that guides the outside air sucked by the fins F to the milled rice basket 3. . Instead of the fins F, a dedicated cooling fan that guides cooling air to the polished rice basket 3 may be provided.

  The rice bran container 2 swelled upward at the center of the bottom is accommodated in the casing A so as to penetrate the rotating shaft 4, and the rice mill basket 3 formed concentrically with the rice bran container 2 is accommodated from above the rice bran container 3. A stirring member 5 is fitted into a rotating shaft 4 extending upward from the central portion of the bottom portion 3A of the bottom portion 3A.

  A plurality of legs 2 </ b> A are provided at the bottom of the basket container 2 and are placed on the support plate of the power transmission mechanism 10. It is also possible to reduce vibration by arranging a vibration-proof rubber on the leg 2A.

  The stirring member 5 includes a rod-shaped portion 51 and a stirring blade 52 which is an example of an extending member attached integrally below the rod-shaped portion 51, and the rod-shaped portion 51 has, for example, a hexagonal cross section on the axis. The concave portion is perforated, and a rotational shaft 4 having a slightly small hexagonal cross section is fitted therein and is configured to rotate integrally with the rotational shaft 4. The rotating shaft 4 and the rod-shaped part 51 should just rotate together, and you may be comprised so that both may be engaged by a spline mechanism or a key mechanism.

  In FIG. 1 (b) and FIGS. 3 (b) and 3 (c), a polished rice basket 3 is shown. The bottom 3A of the polished rice basket 3 is formed on an inclined surface 31 that is inclined downward from the central portion to the peripheral wall 3B, and the peripheral wall 3B of the polished rice basket 3 is a metal plate 30 in which a large number of holes 32 are formed. It consists of The inclined surface 31 is set to a range of 5 ° to 15 °, preferably about 10 ° ± 3 ° with respect to the horizontal plane.

  The plate-like body 30 is made of a punching metal using SUS304, and a plurality of herringbone-like long holes arranged in the horizontal direction as a large number of holes 32 are formed by punching a plurality of stages in the vertical direction. The length of each elongated hole is about 8 ± 0.5 mm, the width is about 0.5 to 1.0 mm, the lateral pitch between the elongated holes is about 3 ± 0.5 mm, and the longitudinal pitch between the elongated holes is 15 ±. The value is set to about 0.5 mm.

  Further, a plurality of protrusions 33 are formed on the plate-like body 30 by a press molding method so as to protrude toward the inner surface side of the polished rice basket 3. The protrusions 33 have a diameter of about 10 mm, a height of about 2.5 mm, corners are formed in a curved surface, and are arranged in a staggered manner so as to be evenly distributed from the lower part to the upper part of the plate-like body 30 at an interval of about 10 mm. Yes. The vertical pitch of the projections 33 in the same column is set to about 20 mm, the horizontal pitch of the projections 33 in the same row is set to about 40 mm, the horizontal pitch between adjacent columns is set to about 20 mm, and the vertical pitch between adjacent rows is set to about 10 mm. Yes.

  The rice put into the polished rice basket 3 is rubbed against the peripheral wall of the polished rice basket 3 by centrifugal force applied while being stirred as the stirring member 5 rotates, and at that time, a large number of holes 32 formed in the peripheral wall portion 3B. The rice is rubbed against the edges of the rice cake and the rice cake is scraped off, and the rice cake separated from the rice is discharged from a number of holes and collected in the rice cake container 2.

  As indicated by the white arrow in FIG. 1 (b), when the stirring member 5 rotates, along the inclined surface 31 formed on the bottom 3A of the polished rice basket 3 and inclined downward from the center to the peripheral wall 3B. The rice moves from the central portion to the peripheral wall portion 3B one after another, and the rice moved to the vicinity of the peripheral wall by the pressure of the rice moving later is pushed upward along the peripheral wall and then falls to the central portion side of the polished rice basket 3.

  That is, inside the polished rice basket 3, the rice moves from the central lower region to the peripheral wall, and a circulating flow is generated that rises along the peripheral wall and moves to the upper central portion. The opportunity to be rubbed is given, and it becomes squeezed homogeneously.

  And since the said surrounding wall part 3B is comprised by the plate-shaped body, since sufficient intensity | strength is ensured even if many rices collide, it is necessary to provide the frame etc. for reinforcement, without the surrounding wall being twisted. There is no.

  When the rice moving in the vicinity of the peripheral wall hits the projection 33, the moving direction is changed, and by colliding with other rice, the flow of the rice that circulates in the polished rice basket 3 is fluctuated and circulated in a turbulent state. become. Moreover, the chance that a wrinkle is shaved off also by collision with the protrusion 33 comes to increase. As a result, even when the rotational speed of the stirring member 5 is low, the squeezing is efficiently performed.

  The opportunity for the rice that is going to rise upward in the vicinity of the peripheral wall portion 3B to come into contact with the protrusions 33 distributed and formed on the entire peripheral wall portion of the plate-like body is sufficiently secured, and at that time the kinetic energy of the rice is reduced. Therefore, the cracking of the rice due to the collision with the rice container 3 or the collision between the rice is effectively suppressed.

  Further, since the protrusions 33 are staggered so as to be evenly distributed from the lower part to the upper part of the plate-like body 30, the opportunity of contact per unit area between the rice and the protrusions 33 that are about to rise upward in the vicinity of the peripheral wall. Can be made uniform, and it becomes uniform and efficiently refined.

  In addition, the probability that the scum adheres to the hole 32 of the punching metal is lower than that of the metal mesh and can be easily detached, so that stable rice milling performance can be maintained for a long period of time.

  In the above-described embodiment, the example in which the plurality of protrusions 33 are formed by the press molding method so as to protrude toward the inner surface side of the polished rice basket 3 is described. However, the protrusions 33 formed of different members are attached to the inner surface of the polished rice basket 3. May be.

  FIGS. 8A and 8B show such a protrusion 33. The flat plate 33a is pressed to form protrusions 33 at a constant pitch, and leg portions 33b extending to the left and right sides are inserted into the holes 32 on the peripheral wall from the inner surface of the polished rice basket 3, and then polished. You can get a basket.

The stirring member 5 provided with the rod-shaped part 51 and the extending member 52 is demonstrated.
As shown in FIGS. 5 and 6 (a) to 6 (d), the rod-shaped portion 51 includes a small-diameter cylindrical body 51a having a circular cross section and a large-diameter cylindrical body 51c having a circular cross section below the small-diameter cylindrical body. Agitating blades that are a pair of extending members that are smoothly connected by the truncated cone-shaped connecting portion 51b and pointed to the lower end of the large-diameter cylindrical body 51c in plan view with respect to the central axis of the rod-like portion 51. 52 is projectingly arranged in the radial direction.

  As shown in FIGS. 7A to 7C, the stirring blade 52 passes through a connecting portion 52b extending in the radial direction from the center of the annular base portion 52a having the same diameter as the large-diameter cylindrical body 51c. Furthermore, two blade main bodies 52c having an L-shaped cross section projecting in the radial direction are provided. The stirring blade 52 is made of the same material as the polished rice basket 3.

  The connecting portion 52b is formed to extend from the center of the annular base 52a so as to be inclined at an angle φ1 in the counter-rotating direction with respect to the radial direction, and the blade body 52c is inclined at an angle φ2 relative to the connecting portion 52b in the counter-rotating direction. It is configured. In this embodiment, both φ1 and φ2 are set to about 30 ° ± 5 °, and the angle φ1 + φ2 = φ is set to about 60 ° ± 10 °.

  The two blade bodies 52c having an L-shaped cross section are set to the same value as the inclination angle θ described above with respect to the horizontal plane so that the lower surface 52d is along the inclined surface 31 of the bottom 3A of the polished rice basket 3. Further, the upper end of the rising portion 52e of the blade body 52c is maintained in a horizontal posture, and the vertical width gradually increases as the distance from the center increases in the radial direction.

  When the stirring blade 52 rotates, the rice is pushed diagonally forward in the rotational direction, that is, not in the circumferential direction but in the radial direction by the rising portion 52e of the blade body 52c. As a result, the rice moves in an oblique direction to the peripheral wall of the polished rice basket 3 and is rubbed by the numerous holes 32 in the peripheral wall so as to scrape off the straw.

  Moreover, since the lower surface 52d of the stirring blade 52 is formed in a shape that follows the bottom shape of the polished rice basket 3, an abnormal force is applied to the rice that moves from the central portion to the peripheral wall portion along the bottom portion of the polished rice basket 3. Inconveniences such as cracking of rice can be avoided.

  Further, the gap between the bottom surface 3A of the polished rice basket 3 and the lower surface 52d of the stirring blade 52 is formed to be larger than white rice and smaller than the brown rice, and between the bottom surface 3A of the polished rice basket 3 and the lower surface 52d of the stirring blade 52 But it is configured to be squeezed uniformly.

  The stirring blade 52 may be formed in a curved surface as long as the stirring blade 52 is configured to bend in the counter-rotating direction as it goes radially outward in plan view. Also, the number of stirring blades is not limited to two and may be three or more.

  Depending on the type of rice, an adapter for adjusting the gap between the bottom surface 3A of the polished rice basket 3 and the lower surface 52d of the stirring blade 52 may be provided between the annular base 52a and the large-diameter cylindrical body 51c. Thus, the agitation blade 52 may be replaced to adjust the gap. In addition, a plurality of stirring blades 52 may be prepared in advance so as to use stirring blades 52 having different shapes and sizes depending on the type of rice.

  FIGS. 9A, 9B and 9C show another example of the stirring member 5 provided with the rod-like portion 51 and the extending member 52. FIG. The same components as those in the previous example are denoted by the same reference numerals. Only different points will be described below.

  In the previous example, the cross-section L in which the extending member 52 further protrudes in the radial direction via the connection portion 52b extending in the radial direction from the center of the annular base portion 52a having the same diameter as the large-diameter cylindrical body 51c. In this embodiment, the extending member 52 is made of the material SUS304, and the base end side is attached to the large-diameter cylindrical body 51c. Is composed of a pair of columnar bodies 52f having a circular cross section that is a free end. For example, the male screw formed on the base-end-side surface of the columnar body 52f can be attached by being screwed to the female screw formed on the large-diameter cylindrical body 51c, but the mounting structure is particularly limited. Not.

  The pair of columnar bodies 52f are arranged so as to extend from the outer periphery of the large-diameter cylindrical body 51c toward the side wall of the polished rice basket 3 at an angle of 180 ° in plan view, and the bottom surface of the columnar body 52f is polished in side view. It is formed in a shape that follows the shape of the bottom 3A of the basket 3, and the gap between the bottom surface 3A of the polished rice basket 3 and the lower surface of the extending member is larger than that of white rice and smaller than that of brown rice.

  When the stirring member 5 rotates, the rice moves toward the peripheral wall portion 3B of the polished rice basket 3 by centrifugal force while being urged in the rotation direction by the columnar body 52f. Rice is rubbed against the edges of many holes 32 formed in the peripheral wall portion 3B to scrape off the rice cake, and the rice cake separated from the rice is discharged from the many holes and collected in the rice vessel 2.

  When the rice is urged in the rotation direction of the columnar body 52f, it is urged while moving in the vertical direction along the outer peripheral surface of the columnar body 52f formed on the curved surface. A more stable sperm becomes possible without acting. If the columnar body 52f is formed of a cylindrical body having a cavity formed therein, a motor M having a small torque can be used. The diameter of the columnar body 52f is preferably set in the range of 5 mm to 8 mm.

  FIGS. 10A to 10C show the attachment structure of the gripping portion of the polished rice basket 3. A ridge portion 3D extending in the radial direction is formed in the upper edge opening 34 of the polished rice basket 3, and a recessed portion 3E for positioning and accommodating the ridge container 2 is formed in two radial directions of the ridge portion 3D. Yes. A pair of attachment holes 3F of the grip portion 35 is formed at a position shifted by 90 ° from the formation position of the recessed portion 3E.

  The grip portion 35 is a metal rod-shaped member having a circular cross section with a diameter of about 1 mm, and is formed in a semicircular arc shape having a slightly smaller diameter than the diameter of the polished rice basket 3. Both end portions 35A of the gripping portion 35 are bent along the radial direction of the polished rice basket 3, and are inserted and fixed to the attachment hole 3F so as to be rotatable. The grip portion 35 is rotated between the attachment hole 3F and the posture between the grip posture in which the top portion 35B of the grip portion 35 stands from the flange portion 3D and the storage posture in which the top portion 35B is accommodated in the upper edge opening 34. It can be changed.

  A stepped portion 34A having a width of about 1 mm in plan view is formed between the opening 34 of the polished rice basket 3 and the peripheral wall portion 3B. The top portion 35B is formed with a curvature larger than the curvature of the semicircular arc-shaped gripping portion 35, and is configured such that the tip portion of the top portion 35B is received by the step portion 34A in the accommodated posture.

  The step portion 34A is formed so as to be slightly inclined inward, and is configured such that the rice flowing inside the polished rice basket 3 during the milling process falls into the polished rice basket 3 along the inclined surface even if it rises on the stepped portion 34A. Has been. Further, the diameter of the gripping portion 35 is configured to be smaller by several mm than the diameter of the peripheral wall portion 3B of the polished rice basket 3 so that the rice riding on the stepped portion 34A falls from the gap between the opening 34 and the gripping portion 35. Has been.

  FIG. 11A shows the arrangement of the support plate 80 on which the basket container 2 and the motor M are mounted and the circuit board CB2. The power transmission mechanism 10 is disposed below the support plate 80, a reflective photo interrupter 73 that detects the number of rotations of the rotating shaft 4 is installed on the surface of the circuit board CB2, and a power device is installed on the back surface of the circuit board CB2. Has been placed.

  As shown in FIG. 11B, a light-reflective marker 13M having a width of about 15 mm is provided on the surface of the belt 13 connecting the pulleys P1 and P2, and a photo interrupter 73 detects the passage timing of the marker 13M. It is comprised so that the rotation speed of the motor M can be detected. The marker 13M is composed of a white paint applied to the surface of the belt 13, but the color of the paint is not particularly limited. The marker 13M may be configured by attaching a light reflective tape or the like other than the paint to the surface of the belt 13.

  FIG. 12 shows an electric circuit 6 including a control unit 7 that controls the rice mill 1. In the figure, a circuit block indicated by a one-dot chain line is a circuit block provided on the control board CB1 arranged below the operation button C, and other circuit blocks are arranged on the circuit board CB2. Of the circuit blocks provided on the control board CB1, the control unit 7 may be provided on the circuit board CB2.

  A DC regulator 63 and a diode bridge circuit 66 are connected via a common mode filter 62 to a pair of power lines N and L to which an AC voltage is fed from an AC plug 60, and the DC voltage converted by the diode bridge circuit 66 is a DC voltage. It is configured to be applied to the motor M.

  In the power line N, a semiconductor relay (triac) 65 is provided on the upstream side of the diode bridge circuit 66, and a current measuring resistor 64 is connected on the upstream side of the semiconductor relay (triac) 65. A fuse 61 for overcurrent protection is connected to the power line L, and a switch 67 for detecting the attachment / detachment state of the lid B to the casing A is connected to the downstream side thereof. The switch 67 has a function as a safety switch, and the control unit 7 is configured so that the motor M does not start even when the rice milling button C1 is operated unless the lid B is attached to the casing A.

  A zero cross circuit 71 is connected between the AC plug 60 side of the power line N upstream of the resistor 64 and the AC plug 60 side of the power line L after the switch 67 is turned on, and the zero cross pulse generated by the zero cross circuit 71 is connected. Is input to the control unit 7.

  The zero cross circuit 71 includes a resistance voltage dividing circuit that monitors the AC voltage between the power lines N and L, and a comparator that binarizes the AC voltage taken from the resistance voltage dividing circuit. A zero-cross pulse that rises and lowers with respect to is generated.

  The zero cross pulse is input to the interrupt signal terminal of the microcomputer constituting the control unit 7 to identify whether the frequency of the AC power supply is 50 Hz or 60 Hz, and the cycle of the zero cross pulse, that is, the interrupt cycle is determined. In order to adjust the rotational speed of the motor M, it is used for driving control of the semiconductor relay 65. An internal clock of the microcomputer is used for measuring the driving time of the motor M.

  Since the zero-cross pulse is output from the zero-cross circuit 71 only when the switch 67 is closed, the controller 7 is in a state where the switch 67 is closed when the zero-cross pulse is input, that is, the cover B is attached to the casing A. If the zero cross pulse is not input, it can be identified that the switch 67 is opened, that is, the lid B is detached from the casing A.

  Further, the output of the reflection type photo interrupter 73 for detecting the number of rotations of the rotating shaft 4 driven by the motor M is input to the control unit 7 through the amplifier circuit 74, and stops when the temperature of the motor M rises abnormally. In order to control, the output of the thermistor 75 for temperature monitoring is input to the control unit 7.

  The DC voltage of DC5V output from the DC regulator 63 is configured to be supplied to a DC load including the control unit 7. In addition to the control unit 7, the control board CB1 includes an SW matrix in which contacts of a plurality of operation buttons C such as the rice milling amount setting button C2, the rice milling degree setting button C3, and the brand selection button C4 are arranged in a matrix. A display LED matrix for dynamically lighting a plurality of LEDs for displaying a selected state, a matrix scanning circuit for scanning them, a buzzer for notifying completion of rice polishing, and a rice milling button C1 for starting rice milling. It has been.

  In the existing rice milling technology, the number of rotations of the motor M is switched only on the basis of time. However, depending on the storage condition of brown rice and the environmental conditions at the time of rice polishing, control of time alone may cause a large difference in the finished state of the polished rice. Therefore, in this embodiment, by detecting the current value of the motor M at the time of rice milling, that is, the load at the time of rice milling, high-precision rice milling control that is not influenced by the environment or the like is possible.

  FIG. 14 shows a procedure of rice milling control executed by the control unit 7. After the milling conditions such as brand and milling amount are set, when the milling button C1 functioning as a start switch is operated (S1), the semiconductor relay 65 is driven and a constant voltage (DC voltage output from the diode bridge circuit 66) 3, DC about 65V) is applied to the motor M and driven, and measurement of the current value flowing through the motor M via the resistor 64 is started (S2).

  Thereafter, when the current peak value is detected (S3), the target rotational speed N1 and rotational time T1 of the first stage motor M are set (S4), and the motor M is controlled to rotate at the rotational speed N1 for the time T1, When the predetermined time T1 elapses (S6), the target rotational speed N2 and the rotational time T2 of the second stage motor M are set (S7), the motor M is controlled to rotate at the rotational speed N2 for the time T2, and the predetermined time T2 (S8), the motor M is stopped and the buzzer is sounded to notify the end of the rice milling (S9). In step S3, if a predetermined allowable time elapses until the current peak value is detected (S5), the process proceeds to step S4 without detecting the current peak value.

  When the processing of steps S4 and S7 is performed, the control unit 7 monitors the rotation speed of the motor M based on the output of the photo interrupter 73 so that the rotation speed of the motor M becomes the target rotation speed N1 or N2. The output voltage of the diode bridge circuit 66 is variably adjusted by controlling the on / off duty of the semiconductor relay 62.

  FIG. 13 shows the control timing of the motor M described above. When the motor M is started at time t1 and the current peak value is detected at time t2, the motor M is driven for the time T1 at the target rotational speed N1, and the time at the target rotational speed N2 at time t3 when the time T1 has elapsed. The motor M is driven only by T2, and at the time t4 when the time T2 has passed, the milling is finished and the motor M is stopped.

  In addition, as for the rotation speed (N1, N2) and time (T1, T2) of the motor M at the time of milling, appropriate values obtained as a result of testing based on combinations of various brands and milling amounts are set in advance. The table data is stored in the storage unit provided in the control unit 7, and the value that matches the brand selected by the brand selection button C4 and the rice milling amount set by the rice milling amount setting button C2 is read from the table data.

  The first stage time T1 is fixed to a fixed time (60 seconds in this embodiment), and the second stage time T2 is set to satisfy the relationship of T2> T1. Further, the rotation speed N1 at the first stage and the rotation speed N2 at the second stage are variably set according to the brand and the amount of polished rice, and are set to have a relationship of rotation speed N1 ≧ N2.

  When the motor M is started and the finening is started, the load is initially high and the current increases. Stable rice milling control while avoiding cracking of rice by determining that the time when the current shows the peak value is the time when the load for polishing is maximized, and then setting the rotation speed N1 and the rotation time T1 Can be realized.

  Then, most of the soot layer is scraped off at the time T1 when the motor M is driven at the rotational speed N1, and then the motor M is driven at the rotational speed N2 at a rotational speed N2 lower than the rotational speed N1, so Will come to be.

In preparation for the case where the time point at which the current shows the peak value cannot be detected, an allowable time is set to avoid the occurrence of cracking of rice due to excessive milling. Normally, the allowable time is set to 20 seconds + α seconds (α is a margin time, 5 seconds in the present embodiment), using as an index that the current peak value can be detected about 20 seconds after the motor M is started. When the set allowable time is exceeded, the motor rotation speed N1 and time T1 stored in the combination of the brand and the amount of polished rice are similarly used.

  A safety circuit is provided that blows the fuse 61 when excessive current flows through the motor M during squeezing. In addition, when the current flowing through the resistor 64 exceeds a preset current upper limit value, the motor M is controlled to stop. Safety controls may be incorporated.

  FIG. 15 shows another control example. In this example, after setting the milling conditions such as brand and milling amount, when the milling button C1 functioning as a start switch is operated (S11), the semiconductor relay 65 is driven and the DC output of the diode bridge circuit 66 is used. A certain constant voltage is applied to the motor M for driving, and measurement of the current value flowing through the motor M via the resistor 64 is started (S12).

  Thereafter, when the peak value of the current is detected (S13), the time Δt required until the current reaches the peak after starting the motor M is obtained, and the first stage of fine adjustment is based on a predetermined function using Δt as a variable. The time T1 is variably set (S14, S15). The subsequent processing from step S16 to step S19 is the same as the processing from step S6 to step S9 of FIG. 14 described above.

  The predetermined function is not particularly limited. For example, if Δt is 20 seconds or more as a standard time, the value obtained by multiplying the value of Δt−20 by a predetermined constant V is used as an index that the current peak value can be detected about 20 seconds after the motor M is started. It can be configured to add to the time T1 of the table data stored in the storage unit.

  For example, when Δt = 30, T1 = 60 + (30−20) × V. When V = 3 is set, T1 = 60 + 10 × 3 = 90.

  Polished rice is largely attributed to the ease of peeling (easy to take off) of the rice bran layer at the outermost part of brown rice. Therefore, the rice having a long time Δt until the current peak is detected can be determined as brown rice that is difficult to polish. Therefore, when the time Δt is long, it takes more time for rice milling than when it is short, so that the state of the rice polishing at the end of the first stage can be made to the same level. The embodiments can be used as they are.

  When the time Δt is less than the standard time, it can be determined that the soot layer has been peeled to a level equivalent to the standard time at that time, and therefore it is preferable to employ the time T1 of the table data stored in the storage unit in advance. . However, similarly to the above, the first stage finening time T1 may be variably set based on a predetermined function having Δt as a variable. For example, if Δt is less than the standard time 20 seconds, a value obtained by multiplying the value of 20−Δt by a predetermined constant V may be subtracted from the time T1 of the table data stored in the storage unit in advance. it can.

  The rice milling machine described above is only one embodiment of the present invention, and the scope of the present invention is not limited by the description, and the specific structure, shape, Needless to say, the size, material, and the like can be changed and designed as appropriate.

1: Rice milling machine 2: Rice bran container 3: Rice milling basket 3A: Bottom part 3B: Peripheral wall part 30: Plate body 31: Inclined surface 32: Hole 33: Projection 34: Opening part 34A: Stepped part 35: Grasping part 4 : Rotating shaft 5: stirring member 51: rod-shaped part 52: extending member (stirring blade, rod-shaped body)
52a: annular base 52b: connection 52c: blade body

Claims (3)

Drive means driven according to the start operation of the milled rice;
Control means for controlling the operation of the drive means,
When the control unit detects a peak value of a current value flowing through the driving unit, the control unit operates the driving unit at a first rotation speed N1 for a first time T1, and after the first time T1 has elapsed, the driving unit Is configured to operate at a second rotation speed N2 for a second time T2. A storage unit in which a combination of the first time T1, the second time T2, the first rotation speed N1, and the second rotation speed N2 is stored in advance according to the rice brand and the amount of polished rice. The rice milling machine according to claim 1, further comprising: a relationship of T2> T1 between the first time T1 and the second time T2. The rice mill according to claim 2, wherein the first rotation speed N1 and the second rotation speed N2 are set to satisfy a relationship of N1≥N2.

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