JP2006346627A - Rice polishing apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice polishing apparatus capable of preventing half-polished rice left in the corners of the bottom section of an elevator from mingling with polished rice being recycled and from being discharged from a rice polisher as it remains half-polished. <P>SOLUTION: The rice polishing apparatus comprising a rice polisher and an elevator that vertically conveys rice particles discharged from the rice polisher to a subsequent process is characterized by having a residual-rice discharger disposed in the bottom section of the elevator and activated and controlled by a controlling unit so as to pneumatically discharge residual rice from the elevator. At the beginning of the operation, the controlling unit causes an untreated rice tank to discharge rice particles therefrom to the rice polisher for a period when half-polished rice is being discharged from the rice polisher and causes the elevator to convey the half-polished rice back to the untreated rice tank. As soon as the discharge of the half-polished rice from the rice polisher has ended, the controlling unit causes the residual-rice discharger to discharge the residual rice remaining in the bottom section of the elevator therefrom and to convey it back to the untreated rice tank, and thereafter causes the untreated rice tank to restart discharging rice particles to the rice polisher. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rice milling apparatus and method.

Conventionally, in a rice mill, rice under-milled rice is discharged because the pressure applied to the rice grains in the milling chamber is lower than the steady state at the beginning of operation. Then, in order to scour the milled deficient rice discharged from the mill, it is returned to the mill.
FIG. 5 is a cross-sectional view showing a configuration example of a conventional rice milling apparatus. This rice milling apparatus 1 is provided with a rice return damper 4 following the white rice discharge port 3 of the rice milling machine 2, and is connected from the rice return damper 4 to the lower receiving port 7 of the elevator 6 through the rice return chute 5. ing. Then, the milled deficient rice generated at the start of the rice polishing is returned to the rice milling tank 8 through the rice returning chute 5 and the elevator 6 by opening the rice returning damper 4 as shown by a one-dot chain line in the figure (see, for example, Patent Document 1). ).

  However, in this conventional rice milling apparatus 1, there is a problem that a part of the milled deficient rice fed into the lower receiving port 7 of the elevator 6 remains in the bottom corner of the elevator 6 without being vertically conveyed. . Further, the conventional rice milling apparatus 1 is configured to recycle the milled rice to the rice milling machine 2 having a pressure lower than that in a steady state at the end of the milling. Therefore, the milled deficient rice remaining in the bottom corner of the elevator 6 is gradually mixed with the recycled milled rice, and is discharged out of the milled rice machine 2 from the white rice discharge port 3 of the milled rice machine 2 without the milling. Problem occurs.

Japanese Patent Application No. 11-165082

  The present invention has been made in order to solve the above-described problems of the prior art, and an object thereof is to provide a rice milling apparatus and method that does not discharge millet-deficient rice from the rice milling apparatus toward the subsequent process. To do.

In order to achieve the above-mentioned object, the invention described in claim 1 is a raw material tank in which rice grains conveyed from a previous process are stuck and a rice grain discharge port can be opened and closed, and a rice mill that refines rice grains from the raw material tank. And a white rice temporary storage tank for temporarily storing the white rice polished by the rice mill and discharging it to the rice mill from an openable and closable outlet, and vertically conveying the rice grains discharged from the rice mill A lift that discharges to any one of the raw material tank, the white rice temporary storage tank, and a post-process, and a control unit that drives and controls the rice grain discharge port of the raw material tank, the white rice temporary storage tank discharge port, the rice mill and the lift In the rice milling machine equipped with
The elevator is provided with a residual rice discharging device that is driven and controlled by the control unit so as to discharge rice grains remaining at the bottom of the elevator to the outside using air, and the control unit includes the rice mill At the beginning of the operation, the rice grain outlet of the raw material tank is controlled to be opened for a preset time, and the rice grains are discharged from the raw material tank toward the rice mill, and the rice grains discharged from the rice mill are removed. While returning from the elevator to the raw material tank and stopping the discharge of the rice grains from the raw material tank to the rice mill, a predetermined time has elapsed and the discharge of the rice grains from the rice mill is stopped. Is set in advance so that the remaining rice discharging device is operated to discharge the residual rice remaining at the bottom of the elevator to the outside of the apparatus and return it to the raw material tank.

  In order to achieve the above object, in addition to the configuration of the invention described in claim 1, the control unit according to the second aspect of the invention is configured such that when the control unit returns the rice grains remaining at the bottom of the elevator to the raw material tank, the raw material The rice grain discharge port of the tank is controlled to be opened to resume the discharge of the rice grains from the raw material tank to the rice mill, and the rice grains discharged by the rice mill are sent from the elevator to the white rice temporary storage tank or any one of the post-processes. It is characterized in that it is set in advance so as to be discharged.

  In order to achieve the above object, in addition to the configuration of the invention described in claim 2, the control unit according to the third aspect of the invention is configured such that when the discharge of the rice grains from the raw material tank to the rice mill is completed, the control unit It is preset that the white rice stored in the white rice temporary storage tank is discharged toward the rice milling machine by opening the discharge port of the temporary storage tank.

  In order to achieve the above object, in the invention described in claim 4, in addition to the configuration of the invention described in claim 1, the set time is a time during which deficient rice is discharged from the rice mill at the beginning of operation. It is characterized by.

In order to achieve the above object, the invention described in claim 5 is a rice milling method in which the rice grains that have been vertically conveyed by the elevator after being discharged from the raw material tank through the rice milling machine are returned to the raw material tank and re-milled.
At the beginning of the operation of the rice mill, a step of discharging rice grains from the raw material tank toward the rice mill for a preset time, and the rice grains discharged from the rice mill to the raw material tank through an elevator A step of returning, and in a state where the discharge of rice grains from the rice mill is stopped, the step of discharging the rice grains remaining at the bottom of the elevator to the raw material tank by using air to return to the raw material tank; and The process of restarting the discharge of rice grains from the raw material tank to the rice mill when the rice grains remaining at the bottom are returned to the raw material tank, and the white rice temporary storage tank for returning the rice grains discharged from the rice mill and vertically conveyed by the elevator to the rice mill Alternatively, the method includes a discharge step in any one of the subsequent steps.

  The rice milling apparatus and method of the present invention returns the entire amount of the milled deficient rice generated at the beginning of the operation of the rice milling machine to the raw material tank without leaving it in the elevator by the remaining rice discharging apparatus, and the pressure is steady over time. Since the rice mill is re-milled by the rice milling machine and then transported from the elevator to the subsequent process, it is possible to provide a rice milling apparatus and method that does not discharge the milled deficient rice from the rice milling apparatus toward the subsequent process.

  A rice milling apparatus according to an embodiment of the present invention includes a raw material tank that can be used to open and close a rice grain discharge port and paste a rice grain that has been transported from the previous process, a rice mill that refines rice grains from the raw material tank, and a rice milling machine. A white rice temporary storage tank that temporarily stores polished rice and discharges it to a rice mill from an openable and closable discharge port, and a raw material tank, a white rice temporary storage tank after vertically transporting the rice grains discharged from the rice mill It has an elevator that discharges to any one of the subsequent processes, a rice grain outlet of the raw material tank, an outlet of the white rice temporary storage tank, a rice mill, and a controller that controls the elevator.

  The remaining rice discharging device includes a rice presence detecting means for detecting the presence or absence of rice grains put into the elevator, and a jet that blows out compressed air that is driven and controlled by a drive signal from a control unit according to a detection value of the rice presence detecting means. And an air nozzle as a wind means. Then, when compressed air is blown out from the air nozzle by the drive signal of the control unit, the residual rice that cannot be taken into the bucket of the elevator and remains in the bottom corner is blown up, and the residual rice is put into the bucket By making it take in, all the residual rice remaining in the machine is discharged outside the machine.

  The controller controls the elevator so that the rice grain discharged by the rice milling machine becomes the raw material tank when the rice milling machine starts operation, and the milled deficient rice discharged from the rice milling machine with low initial pressure. Return to the raw material tank. Further, when a preset time has elapsed since the start of operation of the rice milling apparatus, the rice grain discharge port of the raw material tank is closed to stop the supply of rice grains to the rice mill. When it is detected that the preset set time has elapsed or the discharge of the rice grains lacking milling from the rice milling machine has been stopped by the detecting means, the control unit removes the rice milling deficient rice remaining in the bottom corner of the elevator. In order to discharge, the remaining rice discharging device is operated to return the milled deficient rice remaining at the bottom of the elevator to the raw material tank. When the milled deficient rice is returned to the raw material tank, the control unit opens the rice grain discharge port and resumes discharging rice grains from the raw material tank toward the rice mill. In the state where the discharge of rice grains from the raw material tank has been resumed, the pressure of the rice milling machine is in a steady state over time, so the control unit sets the rice grains discharged by the rice milling machine in advance. After being discharged into the white rice temporary storage tank only for the time, the elevator is driven and controlled so that it is discharged to the subsequent process. The white rice stored in the temporary rice storage tank is discharged from the raw material tank toward the rice mill when the rice grains are discharged, and prevents the pressure in the milling chamber of the rice mill from dropping immediately before the milling. , To prevent the occurrence of inadequate rice. In other words, after the entire amount of milled deficient rice generated at the beginning of the operation of the rice milling apparatus is returned to the raw material tank, it is re-milled by a rice milling machine whose pressure has reached a steady state and then transferred to the subsequent process. Rice that is deficient in milling is not discharged from the equipment toward the subsequent process.

  In addition, the rice milling method according to the embodiment of the present invention is a rice milling method in which the rice grains vertically discharged from the raw material tank through the rice mill are returned to the raw material tank and re-milled. In that case, the process of discharging rice grains from the raw material tank to the rice mill for a preset time, the process of returning the rice grains discharged from the rice mill to the raw material tank via the elevator, In the state where the discharge of rice grains has stopped, the process of discharging the rice grains remaining at the bottom of the elevator to the outside using the air and returning them to the raw material tank, and returning the rice grains remaining at the bottom of the elevator to the raw material tank A process of restarting the discharge of rice grains from the raw material tank to the rice mill, and a process of discharging the rice grains discharged by the rice mill and vertically conveyed by the elevator to either one of the white rice temporary storage tank or the subsequent process. is doing.

  According to this rice milling method, with the start of operation of the rice milling apparatus, the elevator is operated so as to return the milled deficient rice discharged from the rice mill with a low initial pressure to the raw material tank. Further, when a preset time has elapsed since the start of operation of the rice milling apparatus, the rice grain discharge port of the raw material tank is closed to stop the supply of rice grains to the rice mill. When the preset set time elapses or the detection value of the detection means detects that the discharge of the rice grains with insufficient polishing from the rice milling machine is stopped, the remaining rice discharging device including the air nozzle that blows out air, for example, compressed air is operated. By blowing up the remaining rice that could not be taken into the bucket of the elevator and remaining in the bottom corner, and taking the residual rice into the bucket, all the remaining rice left inside the machine was taken out of the machine. Discharge to return to the raw material tank. When the milled rice is returned to the raw material tank, the discharge of rice grains from the raw material tank to the mill is resumed. In the state where the discharge of rice grains from the raw material tank has been resumed, the pressure of the rice milling machine is in a steady state with the passage of time, so the white rice temporary storage tank that returns the rice grains discharged by the rice milling machine to the rice milling machine or The elevator is operated so as to be discharged to any one of the subsequent processes. In other words, after returning the entire amount of milled deficient rice generated at the beginning of the operation of the rice mill to the raw material tank, it is re-milled by a rice mill that has reached a steady state and then transferred to the subsequent process. The rice that is deficient in fineness will not be discharged.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a front view of a rice milling apparatus to which the present invention is applied, FIG. 2 is a sectional view of a rice milling machine in the same example, FIG. 3 is a sectional view of a friction milling part of the rice milling machine in the same example, FIG. It is a flowchart of the control part in the example.

As shown in FIG. 1, a rice milling apparatus 10 to which the present invention is applied includes a raw material tank 12 a that allows a rice grain conveyed from the previous process to be inserted and that can open and close a rice grain discharge port 11 a, and discharges from the raw material tank 12 a. A rice mill 13 for milling the produced rice grains, a white rice temporary storage tank 12b for temporarily storing the white rice polished by the rice mill 13 and discharging it to the rice mill 13 from an openable / closable discharge port 11b, and a rice mill The rice grains discharged from 13 are vertically conveyed and then discharged as raw material tank 12a, white rice temporary storage tank 12b and the subsequent process, and as a lift and return lift 14, and rice grain discharge port 11a of raw material tank 12a And a control unit 15 for driving and controlling the discharge port 11b of the white rice temporary storage tank 12b, the rice mill 13 and the discharge and return elevator 14. There.
In addition, although the raw material tank 12a and the white rice temporary storage tank 12b are each formed by dividing the inside of the tank 12 into two by a vertical vertical wall, it is not limited to this and may take an independent tank form. Is possible.

  On the upstream side (upstream side) of the rice milling apparatus 10, for example, a raw material stuffing elevator 16 for placing rice grains (brown rice) discharged from a stone remover (not shown) on the raw material tank 12a is disposed. This raw material loading elevator 16 takes rice grains introduced into the machine from a lower tension hopper 17 into a bucket circulating in the machine by a chain or belt (not shown) and vertically conveys the rice grains from the bucket at an upper discharge port. After discharging, it flows down toward the raw material tank 12a. At the bottom of the raw material loading elevator 16, there is disposed a residual rice discharging device 18 that discharges residual rice that cannot be taken into the bucket and remains in the bottom corner using air. .

  The remaining rice discharging device 18 includes, for example, a rice sensor (not shown) that detects that the rice grains input from the lower hopper 17 are vertically conveyed and then sent to the raw material tank 12a, and a detection value of the rice sensor. The control unit 15 outputs a drive signal when the rice grains have been sent to the raw material tank 12a based on the above, and when the drive signal is output from the control unit 15, the compressed air is blown to blow up the remaining rice remaining in the corner of the machine An air nozzle (not shown) that blows out is provided. When compressed air is blown out from the air nozzle, residual rice that cannot be taken into the bucket and remains in the bottom corners is blown up, and the residual rice is taken into the bucket so that the inside of the elevator All the residual rice remaining in is discharged toward the raw material tank 12a. The remaining rice discharging device 18 is not limited to the above-described form that blows out compressed air, but adopts a form using air, for example, a form that sucks residual rice and discharges it outside the apparatus. It is possible.

  The raw material tank 12a is supported by the support base 19 so as to be positioned above the rice mill 13 together with the white rice temporary storage tank 12b, and flows down from the rice grains that have flowed down from the raw material loading elevator 16 and the discharge and return elevator 14. The rice grains (milled deficient rice) are put into the tank, and the rice grains are discharged from the rice grain outlet 11a provided at the bottom of the bottom of the tank formed in a funnel shape toward the inlet 20 of the rice mill 13. The rice grain outlet 11a is assembled with an open / close device (not shown) that opens and closes the rice grain outlet 11a in response to a control signal from the control unit 15, and discharges rice grains to the rice mill 13 and The discharge can be stopped.

  The white rice temporary storage tank 12b pastes the white rice that has been refined by the rice milling machine 13 and discharged from the discharge and return elevator 14 into the tank, and from the outlet 11b provided at the bottom of the tank, to the inlet of the rice mill 13 The white rice is discharged toward 20. The discharge port 11b is provided with an unillustrated opening / closing device (for example, a slide shutter) that opens and closes the discharge port 11b in accordance with a control signal from the control unit 15, and discharges and discharges white rice to the rice mill 13. It can be stopped.

  As shown in FIG. 2, the milling machine 13 has two upper and lower grinding-type rice milling (milling) machine parts 21 and a friction-type rice milling (milling) machine part 22 for shaving the surface of the brown rice. A first blowing device 23 (for example, a blower) that blows air from the inside, and at the end of milling, in order to discharge residual rice in the grinding-type rice milling unit 21 and the friction-type rice milling unit 22 from the rear to the front of the milling chamber A second blowing device 24 (for example, a compressor) that blows compressed air toward the outside is provided.

  On the top surface of the casing of the rice mill 13, a funnel-shaped inlet 20 is provided for guiding rice grains discharged downward from the raw material tank 12 a into the casing. A rice sensor 25 is provided as rice detection means for detecting the presence or absence of rice grains passing through the mouth 20. The detection value detected by the rice sensor 25 is input to the control unit 15 that controls the milling by the rice mill 13. When the start button of the operation unit 26 (shown in FIG. 1) provided on the front surface of the casing is pressed and a rice detection signal from the rice sensor 25 is input, the control unit 15 Is set in advance to start the operation.

  A grinding-type rice milling machine portion 21 is disposed laterally below the insertion port 20 so as to extend in the longitudinal direction of the machine body, and a grinding mold is formed via a bowl-shaped member 27 in which rice grains from the insertion port 20 extend downward. It is guided into the rice milling machine unit 21. The grinding-type rice milling machine section 21 includes a horizontal single-shaft / one-chamber grinding-type milling chamber 28, and inside the grinding-type milling chamber 28 on the front side of the machine body, the rice grains flowing down from the inlet 20 are provided. A screw conveyor 29 for laterally conveying and a grinding roll 31 for shaving a hard surface of rice grains together with a cylindrical scouring net 30 in a grinding type squeezing chamber together with a brown scouring net 30 by about 1% by weight is connected to one axis. Further, the grinding roll shaft 32 is rotatably arranged.

  A front side of the grinding roll shaft 32 is provided with a discharge port (not shown) for discharging the milled rice from the grinding-type milling chamber 28, and a horizontally umbrella-shaped movable body that can open and close the discharge port. A pressure adjustment unit 33 is provided for adjusting the wrinkle accuracy by urging the shaft toward the axial direction. In addition, a plurality of air valves 50 are provided at the rear portion of the grinding type milling chamber 28 for blowing the compressed air from the second blowing device 24 toward the front of the discharge port when the remaining rice is discharged. A belt 35 for transmitting the rotational driving force of an electric sub motor 34 as a drive source arranged in parallel below the grinding roll shaft 32 to the grinding roll shaft 32 is provided at the rear of the grinding roll shaft 32. It is wound.

  Then, when the rotational driving force of the sub motor 34 is transmitted to the grinding roll shaft 32 via the belt 35, the grinding roll shaft 32 rotates at a constant speed at the center of the grinding mold squeezing chamber 28. As shown in FIG. 1, the dust such as the shaved shavings is sucked into a dust collector 37 as dust collecting means disposed outside the machine body through a duct 36 connected to the grinding type rice milling machine portion 21. Is done. The dust collector 37 is preferably set to operate by a control means different from the control unit 15 of the rice mill 13, but is not limited thereto.

  Then, as shown in FIG. 2, the rice grains (grinded milled rice) that have been ground by the grinding-type rice milling machine unit 21 are discharged from the discharge port, and then are friction-type polished through a bowl-shaped member 38 extending downward. It is guided to the machine part 22. By the way, a branching portion 40 is provided at an intermediate portion of the bowl-shaped member 38 so that the rice grains discharged from the grinding-type rice milling unit 21 can be discharged out of the machine from the grinding rice exit 39. It is possible to obtain germinated rice (those that have left the germ part of the rice), or to discharge the hard rice grains with a hard layer like old rice and recirculate them to the grinding-type rice mill 21. Yes. The grinding rice exit 39 is connected to the discharge and return elevator 14 via a bowl-shaped member (not shown).

  As shown in FIGS. 2 and 3, the friction-type rice mill unit 22 includes a horizontal type single-shaft / one-room friction-type milling chamber 41, and the friction-type milling chamber 41 includes a grinding-type milling chamber. A screw conveyor 42 for laterally transporting the rice grains discharged from the machine 28 to the friction type scouring chamber 41 on the front side of the machine body, and a rice scum layer 43 on the surface of the rice grains in the friction type scouring room 41. At the same time, a friction roll shaft 45, which is connected to a friction roll 44 for cutting about 9% by weight of the brown rice, is rotatably arranged in a state of being housed in a box-shaped semen chamber cover 46.

  As shown in FIG. 3, at the front of the friction type milling chamber 41, a discharge port connected to a white rice discharge port 47 that discharges rice grains (white rice) that have undergone friction milling in the friction type milling chamber 41 to the outside of the machine. 48, and a pressure adjusting portion 49 (for adjusting the heel accuracy by urging a horizontal umbrella-shaped movable body (not shown) capable of opening and closing the discharge port 48 in the axial direction). (Shown in FIG. 2). In addition, a plurality of air valves 50 are provided at the rear of the friction type sperm chamber 41 for blowing the compressed air from the second blowing device 24 toward the front where the discharge port 48 is located when the remaining rice is discharged. The outlets of these air valves 50 are provided so as to flow in parallel along the inner peripheral surface of the fine mesh 43 so that the compressed air to be blown can reach farther. The compressed air from the second blowing device 24 is also individually supplied to the air nozzle of the remaining rice discharge device 18.

  Further, the friction roll shaft 45 uses a hollow shaft and is connected to the first blast device 23 at the rear end portion of the shaft, and the air supply from the first blast device 23 is introduced into the shaft. It is possible. Further, the front end portion of the friction roll shaft 45 is provided with a vent hole 45a on the circumference that allows air introduced into the shaft to be discharged into the friction roll 44 connected to the front end portion of the friction roll shaft 45. Are arranged in a row at intervals of about 90 degrees.

  The friction roll 44 is formed in a hollow shape so that the friction roll shaft 45 can be fitted therein, and the outer peripheral surface thereof is non-linear in the longitudinal direction of the friction roll 44. The two protruding portions 44a extending in the same manner are integrally formed at positions different by about 180 degrees. A slit (not shown) that connects the inside and the outside of the friction roll 44 is provided discontinuously along the convex portion 44a at a position adjacent to the base of the convex portion 44a. In this case, the air is uniformly distributed from the inside of the friction roll 44 to the outside, that is, toward the friction type squeezing chamber 41, and can be exhausted vigorously.

  As shown in FIG. 2, the friction roll shaft 45 receives a rotational driving force of an electric main motor 51 as a drive source arranged in parallel on the lower side of the friction roll shaft 45. A belt 52 is wound around the belt. The main motor 51 rotates the friction roll shaft 45 at a constant speed during fine adjustment.

  Then, when the rotational driving force of the main motor 51 is transmitted to the friction roll shaft 45 via the belt 52, the friction roll shaft 45 rotates at a constant speed at the center of the friction type scouring chamber 41, so that the surface of the rice grains. The shavings are scraped and dust such as shavings is sucked into the dust collector 37 through a duct 53 (shown in FIG. 1) connected to one side surface of the semen chamber cover 46.

  As shown in FIG. 1, the discharge and return elevator 14 is arranged such that the lower tension hopper 54, the ground rice outlet 39 and the white rice outlet 47 of the rice mill 13 are connected via a bowl-shaped member. The rice grains introduced into the machine from the tension hopper 54 are taken into a bucket circulating in the machine by a chain or a belt (not shown) and vertically conveyed, and discharged from the bucket at the upper discharge port. At the top of the discharge / return elevator 14 is a switching means 55 for switching the rice grains that have been vertically conveyed to any one of the raw material tank 12a, the white rice temporary storage tank 12b, and a subsequent process (for example, a color sorter). Is arranged. Further, the bottom portion of the discharge and return elevator 14 is provided with a residual rice discharge device 56 that discharges residual rice that cannot be taken into the bucket and remains in the bottom corner to the outside of the elevator using air. ing.

The remaining rice discharging device 56 includes an air nozzle (not shown) that blows out compressed air so as to blow up the remaining rice remaining in the corner of the machine when a drive signal is output from the control unit 15. And when compressed air is blown out from this air nozzle, residual rice that cannot be taken into the bucket and left in the corner of the bottom is blown up, and the residual rice is taken into the bucket so that it can be taken into the machine. The remaining residual rice is discharged toward either the raw material tank 12a or the subsequent process.
The remaining rice discharge device 56 is not limited to the above-described form that blows out compressed air, but adopts a form that uses air, for example, a form that sucks and discharges residual rice to the outside. It is possible. Moreover, the compressed air from the 2nd blast apparatus 24 is supplied to the air nozzle of the remaining rice discharge apparatus 56 separately.

Next, a control program preset in the control unit 15 will be described with reference to a control flowchart of FIG.
When the rice grains are put into the tension hopper 17 and the start button of the operation unit 26 provided on the front surface of the housing is pressed (step 10), the control unit 15 immediately starts the operation of the rice milling apparatus 10, The machine 13, the discharge / return elevator 14 and the raw material loading elevator 16 start operation, and the milled deficient rice discharged by the rice mill 13 at the beginning of operation and transported vertically by the discharge / return elevator 14 returns to the raw material tank 12a. The switching means 55 is operated (step 11).
Furthermore, when the rice milling apparatus 10 is in a stopped state, the rice grain discharge port 11a of the rice grain discharge port 11a and the discharge port 11b that are closed is controlled to open, and the rice grains are discharged from the raw material tank 12a toward the rice mill 13. When started, milling is started in the rice mill 13 (step 12). By the way, the remaining rice discharging device 18 of the raw material filling elevator 16 is operated at the time when the supplied rice grains are sent to the raw material tank 12a, and discharges the residual rice in the machine to the raw material tank 12a without leaving any residual rice. .

Next, the control unit 15 determines whether or not a set time set in advance since the rice milling machine 13 starts to operate, that is, a time for discharging the deficient rice from the rice milling machine 13 at the beginning of operation has passed (step S15). 13) If it is determined that the set time has elapsed, first, the rice grain discharge port 11a is closed and controlled so as to stop the discharge of the rice grains from the raw material tank 12a toward the rice mill 13 (step 14).
Next, the control unit 15 operates the remaining rice discharge device 56 of the discharge / return elevator 14 to blow out compressed air from the air nozzle (step 15). Then, the incompletely polished rice remaining in the bottom corner of the discharge / return elevator 14 which cannot be taken into the bucket is blown up and taken out of the elevator by being taken into the bucket, and then the raw material tank 12a. (Step 16).

  When returning to the raw material tank 12a without leaving the milled deficient rice in the discharge and return elevator 14, the control unit 15 controls the opening of the rice grain discharge port 11a to resume the discharge of the rice grains from the raw material tank 12a to the rice mill 13 At the same time (step 17), the rice grains (white rice) that have been crushed and discharged to a desired whiteness from the rice mill 13 whose pressure has become normal with time have been vertically conveyed by the discharge and return elevator 14 and then temporarily polished The switching means 55 is controlled to be discharged so as to be discharged to the storage tank 12b (step 18).

Then, when the set time elapses after being set in advance (step 19), the control unit 15 does not discharge the white rice vertically conveyed by the discharge and return elevator 14 toward the white rice temporary storage tank 12b. The switching means 55 is controlled to be discharged so as to be discharged toward the subsequent process (step 20).
Next, the control unit 15 determines whether or not the discharge of the rice grains from the raw material tank 12a is completed based on the detection value from the rice-owned sensor 25 (step 21), and the discharge of the rice grains from the raw material tank 12a is determined. When it is determined that the rice grain discharge port 11a is closed, the rice grain discharge port 11a is controlled to be closed, and the discharge port 11b is controlled to open so that the white rice is discharged from the white rice temporary storage tank 12b toward the rice milling machine 13, so The pressure in the grinding type milling chamber 28 and the frictional type milling chamber 41 is prevented from decreasing, and the occurrence of rice having insufficient milling is prevented (step 22).

The controller 15 that has controlled the opening of the discharge port 11b determines whether or not the discharge of the white rice from the white rice temporary storage tank 12b has been completed based on at least the detection value from the rice-owned sensor 25 (step 23). If it is determined that the discharge has been completed, it is determined that the milling has ended, and the milling of the rice mill 13 is terminated (step 24).
In the present embodiment, it is configured to determine whether or not the sperm has ended based on the detection value from the rice sensor 25. However, the present invention is not limited to this. It is possible to determine whether or not the finishing of the fineness is completed based on the detected value from the above and the load current value of the main motor 51 that controls the rotation of the friction roll shaft 45. In this case, when the rice sensor 25 detects the absence of brown rice and the load current value is equal to or less than a preset value, for example, 18 A or less in the case of a 20-horsepower rice mill, it is determined that the milling is finished. .

  Then, the control unit 15 operates the air valve 50 to discharge all the remaining rice in the grinding-type milling chamber 28 and the friction-type milling chamber 41 to the outside of the rice milling machine 13 (step 25). The operation is stopped and the remaining rice discharging device 56 is operated to discharge all the remaining rice in the discharge and return elevator 14 to the subsequent process (step 26).

  As described above, according to the present invention, the control unit 15 discharges the rice grains from the raw material tank 12a toward the rice mill 13 for the time during which the milled deficient rice is discharged from the initial operation of the rice mill 13, and the rice mill 13 The rice grains discharged from the tank, that is, the rice with insufficient milling, is returned to the raw material tank 12a through the discharge and return elevator 14. When the discharge of the milled deficient rice from the rice mill 13 is stopped, the control unit 15 operates the pneumatic residual rice discharge device 56 to remove the milled deficient rice remaining at the bottom of the discharge and return elevator 14 from the machine. It is discharged and returned to the raw material tank 12a. Further, when the control unit 15 returns the milled deficient rice remaining at the bottom of the discharge and return elevator 14 to the raw material tank 12a, the control unit 15 restarts the discharge of the rice grains from the raw material tank 12a to the rice mill 13 and the rice mill 13 discharges. The rice grains vertically transported by the discharge / return elevator 14 are set in advance so as to be stored in the white rice temporary storage tank 12b for a preset time, and then discharged to the subsequent process. The white rice stored in the white rice temporary storage tank 12b is discharged toward the rice mill 13 when the discharge of the rice grains from the raw material tank 12a toward the rice mill 13 is completed, and the grinding type milling chamber 28 of the rice mill 13 is just before the milling. The pressure in the inner and frictional type semen chamber 41 is prevented from dropping, and the generation of rice with insufficient semen is prevented. As a result, the milling deficient rice generated at the beginning of the operation of the rice mill 13 does not remain in the discharge and return elevator 14, and after the entire amount is returned to the raw material tank 12 a, the pressure becomes steady over time. Since it is re-milled by the rice mill 13 and then conveyed to the subsequent process, it is possible to provide a rice milling apparatus and method that does not discharge the milled deficient rice from the rice milling apparatus 10 to the subsequent process.

  Note that the present invention is not only applied to the rice milling machine having the horizontal two-shaft and two-chamber milling chamber described above, but also to a bowl-shaped rice milling machine that mills rice grains in the vertical direction. Can do.

1 is a front view of a rice milling apparatus to which the present invention is applied. It is sectional drawing of the rice milling machine in the example. It is sectional drawing of the friction milling part of the rice milling machine in the example. It is a flowchart of the control part in the example. It is sectional drawing which shows one structural example of the conventional rice milling apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rice milling apparatus 11a Rice grain discharge port 11b Discharge port 12a Raw material tank 12b White rice temporary storage tank 13 Rice milling machine 14 Discharge and return elevator 15 Control part 56 Residual rice discharge apparatus

Claims (5)

A raw material tank that allows the rice grain conveyed from the previous process to be attached and that can open and close the rice grain discharge port, a rice mill that refines the rice grain from the raw material tank, and the white rice that has been polished by the rice mill is temporarily stored. And a white rice temporary storage tank that discharges from the openable and closable discharge port to the rice mill, and the raw material tank, the white rice temporary storage tank, and a post-process after vertically transferring the rice grains discharged from the rice mill In a rice milling apparatus comprising a lifting machine that discharges into one, a rice grain discharge port of the raw material tank, a discharge port of a white rice temporary storage tank, a rice milling machine and a control unit that drives and controls the lifting machine,
The elevator is provided with a residual rice discharging device that is driven and controlled by the control unit so as to discharge rice grains remaining at the bottom of the elevator to the outside using air, and the control unit includes the rice mill At the beginning of the operation, the rice grain outlet of the raw material tank is controlled to be opened for a preset time, and the rice grains are discharged from the raw material tank toward the rice mill, and the rice grains discharged from the rice mill are removed. While returning from the elevator to the raw material tank and stopping the discharge of the rice grains from the raw material tank to the rice mill, a predetermined time has elapsed and the discharge of the rice grains from the rice mill is stopped. Is set in advance to operate the residual rice discharging device to discharge residual rice remaining at the bottom of the elevator to the outside of the device and return it to the raw material tank.   When the control unit returns the rice grains remaining at the bottom of the elevator to the raw material tank, the control unit opens the rice grain discharge port of the raw material tank to resume the discharge of the rice grains from the raw material tank to the rice mill, and The rice milling apparatus according to claim 1, wherein the rice milling apparatus is preset so that the rice grains discharged by the machine are discharged from the elevator to any one of a white rice temporary storage tank and a post-process.   When the discharge of rice grains from the raw material tank to the rice mill is completed, the control unit opens the discharge port of the white rice temporary storage tank to discharge the white rice stored in the white rice temporary storage tank toward the rice mill. The rice milling apparatus according to claim 2, wherein the rice milling apparatus is set in advance.   2. The rice milling apparatus according to claim 1, wherein the set time is a time during which rice milling deficient rice is discharged from an initial rice milling machine. In the rice milling method, after the rice grains discharged from the raw material tank through the rice milling machine are vertically conveyed by the elevator, the rice grains are returned to the raw material tank and re-milled.
At the beginning of the operation of the rice mill, a step of discharging rice grains from the raw material tank toward the rice mill for a preset time,
Returning the rice grains discharged from the rice mill to the raw material tank via an elevator;
In the state where the discharge of rice grains from the rice mill is stopped, the process of discharging the rice grains remaining at the bottom of the elevator to the outside using the air and returning them to the raw material tank;
When returning the rice grains remaining at the bottom of the elevator to the raw material tank, restarting the discharge of the rice grains from the raw material tank to the rice milling machine;
A rice milling method comprising: a white rice temporary storage tank for returning the rice grains discharged by the rice milling machine and vertically conveyed by the elevator to the rice milling machine, or a process of discharging to any one of the subsequent processes.

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