JPH04334556A - Rice polishing machine - Google Patents

Abstract

PURPOSE:To permit rice to be polished always to a desired degree of refinery by calculating the threshold value to judge the termination of a main rice polishing operation based on the interior load on a rice polishing chamber obtained during the main rice polishing period at the time of treating the unpolished rices of different natures. CONSTITUTION:A rotary shaft 9 is rotated by a motor 28 via a torque sensor 25 and, when unpolished rice is sent from a hopper 7 into an upper casing 2 by a screw conveyor 6, the unpolished rice is forced into a rice polishing cylinder 3 by a feed roll 10 and the rice is polished between a rotating rice polishing roll 11 and a net 7. In such a rice polishing machine, a rice polishing chamber is provided in its polished rice discharge region with an opening degree limiting member 15 as a polished rice discharge opening adjusting means. This opening degree limiting member 15 is controlled by a control means according to the output from the torque sensor 25 as an interior load detecting means in the rice polishing chamber and the threshold value obtained by calculation based on the interior load detected before a predetermined is compared with the newest detected data of the interior load to determine the termination of the main rice polishing operation.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a rice milling machine that mills brown rice to a predetermined degree of polishing by controlling the internal load of a milling room equipped with driven milling rolls, and in particular, technology for recognizing the end of the main milling process. Regarding.

0002

2. Description of the Related Art A conventional rice milling machine is constructed as shown in FIG. 16, for example. Inside the polishing tube 501, a feed roll 502 and a polishing roll 503 are arranged, and at the outlet of the polishing tube 501 there is a resistance plate 50 that limits the cross-sectional area of the passage.
4 are provided. In the rice polishing process, a feed roll 502 and a polishing roll 503 are rotationally driven by a motor 505, and the brown rice 506 introduced from the top is pushed toward a resistance plate 504 by the feed roll 502, and is passed through the mesh 5 inside the polishing cylinder 1.
09 and a rotationally driven rice polishing roll 503, the brown rice is polished, and the polished white rice is discharged from a polished rice outlet 507. When the opening degree of the polished rice outlet 507 is made small, the internal load of the milling room becomes high and the whiteness becomes high, and when the opening degree is made large, the internal pressure becomes low and the whiteness becomes low. In order to maintain a constant level of polishing, the resistive plate 504 was biased by the pressing force of a spring 508 in the direction of closing the polished rice outlet 507, and a force exceeding the aforementioned biasing force was applied to the resistive plate 504 from the brown rice being milled. At times, the opening degree of the polished rice outlet 507 is increased to discharge polished rice having a specified level of polishing from the polishing tube 1. In conventional rice milling machines configured in this way, there is no brown rice supplied to the milling chamber, and even though the brown rice in the milling chamber has not been sufficiently polished, normal milling becomes impossible due to the drop in internal load. Become. In order to prevent this, it is assumed that the main whitening process has been completed when this state is reached, and the pressing force of the spring 508 is increased, and the opening degree of the outlet 507 is made small, so that some level of whitening process can be carried out even under a low internal load. In other words, it is necessary to carry out terminal whitening treatment. However, even if the minimum value of the internal load in the milling room was monitored in some way, it was not possible to recognize with sufficient reliability the end of the main milling process depending on, for example, the type of rice or the adhesion of bran. .

0003

[Problems to be Solved by the Invention] An object of the present invention is to determine the timing of the end of the main rice polishing process, that is, the transition to the final stage polishing process, in the rice milling machine of the type described above, depending on the type of rice, the adhesion of bran, etc. The objective is to provide a technology that allows decisions to be made with high reliability without any problems.

0004

[Means for Solving the Problems] In order to solve the above problems, a rice milling machine according to the present invention is comprised of the following: a) a milling chamber equipped with milling rolls that mill brown rice into white rice; b) ) brown rice supply means for supplying brown rice to the whitening room; c) white rice outlet adjustment means provided in the white rice outflow area of the whitening room; d) internal load detection means for detecting the internal load of the whitening room; e) a control means for controlling the white rice outflow adjustment means according to a value detected by the internal load detection means; f) a threshold value provided in the control means and calculated based on the internal load detected a predetermined time ago; A main whitening process end determining means for determining the end of the main whitening process by comparing the latest internal load detection data with the latest internal load detection data.

[0005]

[Operation] The rice milling machine with the above configuration calculates a threshold value to determine the end of the main milling process based on the internal load of the milling room detected while performing the main milling process, and uses the latest internal load detection data. Compare and if the termination condition is met,
The main whitening process is completed and a transition is made to the terminal whitening process. At this time, the internal load detection data to be compared may be the latest detected value, or the average value of a plurality of latest detected values.

[0006]

Effects of the Invention In other words, even when processing brown rice with various characteristics, the threshold value for determining the end of the main milling process can be set based on the value of the internal load of the milling room obtained during the main milling process. Because it is calculated, high reliability can be obtained. Furthermore, in one of the preferred embodiments of the present invention, the threshold value is set to be equal to a moving average value of the internal load detected a predetermined time ago.
It is calculated by multiplying the following coefficients. Furthermore, if the internal load of the whitening room is configured to be detected by a torque sensor provided on the rotating shaft of the whitening roll, control based on the detected value of the internal load will function extremely accurately.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In Fig. 1, 1 is a main body casing, and an upper casing 2, a polished cylinder part 3, an intermediate casing 4, and a lower bearing casing 5 are sequentially fitted and connected from the top to the bottom so that their axes are aligned. It is configured. A screw conveyor 6 for supplying brown rice is connected to an opening formed in the upper side wall of the upper casing 2. 7 is a hopper for charging the brown rice, and 8 is a drive motor for the screw conveyor. Reference numeral 9 denotes a rotary shaft that is erected at the center of the upper casing 2, the milling tube portion 3, and the intermediate casing 4, and is formed as a hollow shaft. Upper casing 2 of this rotating shaft 9
A feed roll 10 is attached to the region, and a whitening roll 11 is attached to the whitening tube section 3 area. The feed roll 10 and the whitening roll 11 are connected to each other by a connecting pin 12, and the whitening roll 11 is circumferentially engaged with the rotary shaft 9 by a key 13 at a position near the lower end. In addition, whitening roll 11
A cylindrical recess 14 is formed at the lower end of the opening regulating member 1.
A fitting cylindrical portion 16 extending from the top of 5 is fitted so as to be vertically slidable. The outer peripheral surface of the opening degree regulating member 15 is formed into a cylindrical surface having an appropriate width in the vertical direction. Further, the fitting cylinder part 16 has an inner circumferential surface tapered downward so that the upper end thereof has a pointed shape, and a space is formed between the fitting cylinder part 16 and the outer circumferential surface of the rotating shaft 9. The bran attached to the circumferential surface of the cylindrical recess 14 at the lower end of the cylindrical recess 14 is scraped off, and the bran is not caught between the bottom surface of the cylindrical recess 14 and the upper end of the fitting cylinder 16. . A net 17 is disposed inside the whitening cylinder part 3 at an appropriate distance from the outer periphery of the whitening roll 11, and a discharge port 18 for the bran produced during polishing is opened at the lower part of the side wall of the whitening cylinder part 3. There is. Furthermore, a polished rice outlet forming member 19 is arranged between the lower end of the polished cylinder portion 3 and the upper end of the intermediate casing 4. The inner periphery of the polished rice discharge port forming member 19 is formed into a knife edge, and is in contact with the outer periphery of the opening regulating member 15 having an appropriate width in the vertical direction. A white rice discharge port 20 is formed at the upper end of the side wall of the intermediate casing 4, and a chute 21 is attached thereto. Further, a receiving plate 22 is provided protruding from the rotating shaft 9 to receive the polished rice that has fallen from the polished rice outlet forming member 19 and guide it to the chute 21. intermediate casing 4
An intermediate shaft 23 rotatably supported by a pair of upper and lower bearings 24 is disposed at an intermediate portion thereof, and is fitted and fixed to the lower end of the rotating shaft 9. A torque sensor 25 is arranged in the lower part of the intermediate casing 4, and the upper shaft part 2 protrudes from one end of the torque sensor 25.
5a is fitted to the intermediate shaft 23 so as to be slidable only in the axial direction. Inside the lower bearing casing 5 are a pair of upper and lower bearings 26.
A drive shaft 27 is rotatably supported by a drive shaft 27, and its upper end is fitted to a lower shaft portion 25b protruding from the other end of the torque sensor 25 so as to be slidable only in the axial direction. Furthermore, a drive pulley 28a is fixed to the lower end of the drive shaft 27. This drive pulley 28a is rotationally driven by a motor 28 (not shown in detail) via a drive belt 28b. An opening adjusting shaft 29 is inserted into the hollow rotating shaft 9, and the lower end thereof and the opening regulating member 15 are connected by a connecting member 30 passing through an elongated hole 31 formed in the hollow rotating shaft 9. . The upper end of the opening adjustment shaft 29 is relatively rotatably engaged with the upper surface of an engaging member 34 supported on the elevating member 32 via a spring 33. The elevating member 32 is configured to be movable up and down by an elevating means 35, which is shown simply in FIG. 2 and in detail in FIG. The lifting means 35 is driven by a drive motor 37 as shown in FIG.
It is composed of a feed screw shaft 38 that is rotationally driven by a feed screw shaft 38 , a movable nut body 39 screwed onto the feed screw shaft 38 , and a guide rod 40 thereof, and the movable nut body 39 is connected to the elevating member 32 . That is, the bias force of the spring 33 can be adjusted by the lifting means 35. In the rice milling machine configured as described above, brown rice is transferred from the hopper 7 to the screw conveyor 6 into the upper casing while the rotating shaft 9 is rotationally driven by the drive pulley motor 28 via the drive shaft 27 and the torque sensor 25. If you put brown rice into feed roll 1
It is pushed into the whitening cylinder part 3 at 0, and is polished between the rotating whitening roll 11 and the net 17. In addition, the bran separated during the whitening process is processed by air introduced into the rotating shaft 9 passing through holes (not shown) protruding from the rotating shaft 9 and the whitening roll 11, and passing through the net 17. The rice bran is discharged to the outside along with the airflow flowing toward the rice bran discharge hole 18. The polished white rice is moved up and down by the lifting means 35 by the pressure inside the space between the net 17 of the polishing cylinder part 3 and the polishing roll 11, that is, the polishing chamber.
The white rice is sequentially discharged from an annular discharge opening formed between the outer periphery of the opening regulating member 15 pushed down against the force of the spring 33 bias-adjusted by the white rice outlet forming member 19, and
Thereafter, the polished rice is discharged from the outlet 20 through the chute 21 to the outside. Here, the pressure inside the whitening chamber is detected by the torque sensor 25 as an internal load of the whitening chamber on the rotating shaft 9. FIG. 3 shows a control block diagram of the rice milling machine according to the present invention. Torque sensor 2 mentioned above
5, the motor 8 for the screw conveyor 6, the motor 37 for the lifting device 35, and the motor 2 for the rotating shaft 9, that is, the feed roll 10 and the polishing roll 11.
A control means 36 that outputs a control signal to rice milling machine 8 plays a central role in controlling this rice milling machine. The control means 36 employs a normal microcomputer control method,
It has a CPU 100, a ROM 103, a RAM 104, tables 105 and 106, an input interface 101, an output interface 102, etc., and also has a polishing degree selection means 200 for selecting a desired polishing degree in order to mill rice at various polishing degrees in this rice milling machine. It is equipped. Here, the brightness level selection means 200 includes a numeric keypad type keyboard 210 and a display 2 for selecting the brightness level.
20, and in this embodiment, the degree of brightness can be set from 1 to 16, and the larger the value, the higher the degree of brightness. In the table 105, torque values corresponding to the internal load of the whitening room suitable for the initial whitening process are stored in association with the selectivity selected by the whiteness selection means 200. Furthermore, in this embodiment, three sets of torque values are prepared, and can be selected using the dip switch 105a according to the characteristics of the rice milling machine. In other words, as can be clearly understood from the table in Figure 4,
In the level 1 set, R1 1 to R1 16 are stored corresponding to 16 levels of refinement, in the level 2 set R2 1 to R2 16, and in the level 3 set R3 1
From R3 16 are stored. The relationship between the level of the stored torque value and the degree of polishing is shown in the graph in Figure 5. As the degree of polishing increases, the torque value increases monotonically, and the higher the level of the set, the larger the value. It has become. This makes it possible to use a torque value that can sufficiently compensate for variations in the characteristics of the rice milling machine as the milling chamber internal load value for performing the desired initial milling process. In the table 106, upper and lower limits of torque values corresponding to the internal load of the whitening room suitable for the main whitening process are stored in association with the selectivity selected by the whiteness level selection means 200. It is also possible to prepare a plurality of sets of this series of torque values, and in that case, an appropriate set can be selected using the dip switch 106a according to the characteristics of the rice milling machine. The CPU 100 selects the ROM 1 based on the torque detection signal sent from the torque sensor 25 and the polishing processing mode selected by the polishing degree selection means 200.
The motor 8 for the screw conveyor 6, the motor 37 for the lifting device 35, A control signal is output to the motor 28 for the rotating shaft 9 to control the polishing process. As will be described in detail later, a storage area for storing a plurality of torque detection signals is secured in the RAM 104, and in the main polishing process, the torque detection signals are converted into detected torque values, and the well-known moving average method is used to convert the torque detection signals into detected torque values. The moving average value is calculated moment by moment and stored in the same way, and used to calculate the threshold value for determining the end of the main whitening process. Moving on to the final stage whitening process, a series of these operations are performed by the control device 36 as a function of determining the end of the main whitening process. The control flow of the whitening process of the rice milling machine according to the present invention will be explained below using the flowcharts shown in FIGS. 6 to 14. What is shown in Fig. 6 is a flowchart showing the main routine of this rice milling machine. First, the operator selects the desired degree of milling, that is, the milling processing mode (#0), and presses the start button. When the whitening process starts, the lifting means 35 is driven to adjust the bias of the spring 33 and the opening adjustment shaft 29 is set at Pmin.
Set the urging force of (#2). Drive the motor 28 to rotate the polishing roll 11 and the feed roll 10 (#4), take in the detected value of the torque sensor in this state, that is, the no-load torque value: To, and store it at a predetermined address in the RAM 104. (#6). Detection by the torque sensor 25 is actually repeatedly performed at appropriate time intervals in torque detection interrupt processing, which will be explained later, and the detected value is stored at a predetermined address in the RAM 104 after appropriate arithmetic processing. Therefore, in the control routine, it is sufficient to take in the torque detection value from there. Next, the biasing force of the opening adjustment shaft 29 is set to Pmax, which is a higher value than Pmin (#8). From this point on, the actual whitening process begins.
This is divided into an initial whitening process (#10), a main whitening process (#12), and a final whitening process (#14), which will be explained in detail later. In the torque detection interrupt processing described above, as shown in FIG.
#1100). For example, in this embodiment, eight torque detection values are stored, and the values that are input first are sequentially rewritten with the newly acquired values. This makes it possible to perform calculations using the eight latest torque detection values in subsequent steps. From this torque detection value, calculate the average torque value: Tm using the moving average method (#1200),
From this average torque value: Tm, subtract the no-load torque value: To taken in #4 and multiply by the coefficient: K to obtain the threshold value for completing the main polishing process: S, which will be described in detail later.
Calculate (#1300). Coefficient: K is appropriately selected from the range 0<K<1. This threshold: S is a predetermined R
It is stored in the address of AM104 (#1400),
At that time, 200 storage locations are prepared, and the latest 200 reference values will be stored. If this interrupt processing is operated in a cycle of, for example, 10 ms, the threshold value S calculated up to exactly 2 seconds ago will be stored. Of course, it is possible to store the threshold value S up to an arbitrary time by taking up a larger storage space or changing the operation cycle. Next, the initial whitening process will be explained using FIG. : Becomes Tob. Next, the screw conveyor 6 is started operating in the first mode in which the conveyance amount is large (
#51) Brown rice is introduced from the hopper 7 into the internal space of the milling cylinder section 3, that is, into the milling chamber. After the time set by the first timer, during which the milling chamber is almost filled with the supplied brown rice (#52, #54), the screw conveyor 6 is stopped (#56). Next, the operation is restarted in the second mode in which the conveyance amount is small (#64), and compared with the initial polishing reference value: Tob determined in step #50 (#60, #62
), when the detected value exceeds Tob, the milling chamber is completely filled with brown rice and the screw conveyor is stopped (#
64). In this state, whitening is performed in the whitening room for the time set by the second timer (#66, #68). It is preferable to control the screw conveyor so that the first mode described above is continuous operation and the second mode is intermittent operation, but instead of this, the first mode is high speed operation and the second mode is low speed operation. It is also possible to do this. Furthermore, the first
Rather than setting the operating time of the mode using a timer, it is also possible to control the operation until a predetermined load value, that is, a detected torque is obtained, while monitoring the internal load of the milling room using a torque sensor. In this initial polishing process, the biasing force against the opening adjustment shaft 29 is adjusted to be high, so that unpolished brown rice is not released. For the white rice polished during this period, the supply of brown rice by the screw conveyor is restarted in the next main milling process, and the opening adjustment shaft 29, that is, the opening regulating member 15 is moved downward due to the pressure of the supplied brown rice pushing into the milling chamber. A discharge port is formed between the opening regulating member 15 and the polished rice discharge port forming member 19, and the polished rice is discharged from this discharge port. Next, the main whitening process will be explained using FIG. 9 to FIG. 13; first, the whitening level selected by the whitening level selection means 200 is checked (#100), and if the whitening level is "1", the whitening level is checked (#110). Based on the steps from #160 to #160, when the fineness level is "2", based on the steps #210 to #260, and when the fineness level is "3", based on the steps #310 to #360, similarly For 16” #410
Based on steps #460, each whitening process is performed according to the 16 whitening degrees. For example, "Fineness"
1” is selected, the motor 37 of the lifting means 35
is driven to change the bias of the spring 33, and the biasing force applied to the opening adjustment shaft 29 is adjusted to P1 suitable for the polishing level "1".
(#110). The biasing forces P1 to P16 corresponding to this polishing degree are stored in the table 106 and read as necessary. Next, the screw conveyor 6 starts operating in the third mode (#120), and begins to newly supply brown rice to the milling room. This third mode of operation is a so-called steady continuous operation of the screw conveyor 6, and the specifications of the motor 8 of the screw conveyor 6 are usually determined based on the load during this operation. In the polishing process that starts from this, the torque value detected by the torque sensor 25 is the torque range for polishing level "1", that is, the lower limit value:
T1a is compared with the upper limit: T1b (#130). There is a correlation between the degree of polishing of polished white rice and the internal load of the milling room during milling, that is, the detected torque value in this example. This is because it can be refined with precision. The lower limit value and upper limit value are also stored in the table 106 according to the whiteness level and read out as necessary. When the detected torque value: T is smaller than the lower limit value: T1a, the elevating means 35 is controlled to increment the biasing force of the opening adjustment shaft (#140), and when the detected torque value: T is larger than the upper limit value: T1b, the elevating means 35 to decrement the biasing force of the opening adjustment shaft (#150), and if the detected torque value: T is between the lower limit value: T1a and the upper limit value: T1b, the biasing force of the opening adjustment shaft is decreased. Leave as is. That is, when the internal load of the whitening room increases and the load torque acting on the whitening roll 11 increases, the torque value T detected by the torque sensor becomes larger than the upper limit value T1b. In this case, the elevating means 35 is driven by a control signal from the control means 36, and the elevating member 32 is lowered. As a result, the upward biasing force of the opening adjustment shaft 29 by the spring 33 decreases, and the opening adjustment shaft, that is, the opening regulation member 15 descends.
The flow cross-sectional area of the outlet formed between the white rice outlet forming member 19 becomes larger. Therefore, the internal load of the whitening room is reduced. Conversely, when the internal load of the whitening room becomes small, the flow cross-sectional area of the outlet becomes smaller through the same procedure, and the internal load of the whitening room increases. In this way, by keeping the torque detection value of the torque sensor constant, accurate polishing degree, that is, polished rice that matches the selected polishing mode can be obtained. During such main whitening processing, if the detected torque value: T falls below the threshold value: S described in the torque detection interrupt processing, which in this example was calculated 2 seconds ago, All of the brown rice placed in the hopper 7 is supplied to the milling room, and when it is determined that there is no more brown rice to be supplied (#160), this main milling process is completed and the process moves to the next terminal milling process. In other words, the latest detected torque value is checked using a threshold value created by processing the moving average value of the torque values detected a predetermined time ago.
It determines the timing of the end of the main whitening process, that is, the start of the final whitening process. Up to this point, we have described the main whitening process at a whiteness level of "1," but processes at other whiteness levels are performed in the same way. However, when the polishing level is "2", the urging force at #210 is set to P2, and the lower limit value of the detected torque at #230 is replaced by T2a and the upper limit value is replaced by T2b. Similarly, at polishing level "3", the urging force at #310 is P3
The lower limit of the detected torque at #330 is T3a.
The upper limit value is replaced by T3b. Similarly, when the polishing level is "16", the urging force at #410 is set to P16, and #
The lower limit value of the detected torque at 430 is replaced with T16a and the upper limit value with T16b. Next, the terminal polishing process will be explained using FIG.
ax (#500), and the screw conveyor 6 is stopped. Since the biasing force against the opening adjustment shaft 29 is suddenly increased, the flow cross section of the discharge port is also reduced, and discharge of polished rice is suppressed. In this state, after the whitening process by the rotation of the whitening roll 11 continues for the time set by the third timer (#520, #530), that is, the time when the brown rice in the whitening room is almost polished, the opening is adjusted. By reducing the urging force on the adjustment shaft 29 and setting it to, for example, Pmin (#540), the opening adjustment shaft 29 is lowered, and as a result, the flow cross section of the discharge port is expanded, and the polished rice in the milling chamber is discharged. . Set the time in advance for the complete release of white rice from the milling room.
It is set on a timer, and when the fourth timer times out (#520, #530), the rotating shaft 9, and as a result, the feed roll 10 and whitening roll 11 are stopped (#520, #530).
570), a series of whitening processes is completed. FIG. 15 is a graph showing the relationship between the above-mentioned initial rice milling, main rice milling, and final rice milling and the internal load of the milling room, that is, the detected torque. To explain this graph, X0
At the time point, the rice milling machine is in a no-load operation, and at the time point X1, a biasing force of Pmax is applied to the opening adjustment shaft 29, and the supply of brown rice by the screw conveyor 6 is started. The detected torque value gradually increases, and at time X2, the polishing chamber reaches an internal load state that allows polishing, that is, the detected torque value reaches Toa, and initial polishing is started. When the detected torque value reaches Tob determined corresponding to the selected polishing degree at the time of X3, the screw conveyor 6 is stopped for a predetermined time, the supply of brown rice is stopped, and the discharge of white rice is also stopped. Initial whitening continues. As the polishing process progresses, the bran is removed from the brown rice, and the detected torque value gradually decreases. At time X4, main polishing is started, and a biasing force corresponding to the selected polishing mode is applied to the opening adjustment shaft 29, and the screw conveyor 6 is restarted. The torque value increases as the brown rice is supplied to the milling room, and the opening adjustment shaft 2 is adjusted so that the torque value falls between the reference torques T1a and T1b corresponding to the selected milling degree while discharging the white rice from the discharge port.
The polishing process is performed while controlling the biasing force applied to 9. When there is no brown rice to be milled, no brown rice is supplied to the milling room, so the detected torque value begins to decrease and falls below the threshold value S, which is determined from the moving average of the torque values detected a predetermined time ago. At time point X5, the urging force on the opening adjustment shaft 29 is increased to Pmax to perform the final polishing while suppressing the discharge of polished rice from the discharge port. Then, at the time when the brown rice in the milling chamber has been milled, that is, at the time of X6, the biasing force against the opening adjustment shaft 29 is lowered to Pmin, and the white rice is discharged from the milling chamber.
The whitening process is completed at the time of X7.

[Another Embodiment] In the above-described embodiment, a torque sensor installed on the rotating shaft of the whitening roll is used to detect the internal load of the whitening room, but instead of this, a whitening roll motor 28 is used. It is also possible to detect the current value of the milling room and thereby monitor the internal load of the milling room. In addition, instead of comparing the latest torque detection value with the threshold value obtained a predetermined time ago to determine the timing of the end of the main milling process, that is, the start of the terminal milling process, By comparing the threshold value with the latest moving average value, it is possible to avoid malfunctions caused by suddenly occurring detected values.

[Brief explanation of the drawing]

[Figure 1] Longitudinal cross-sectional view showing the overall configuration of a rice milling machine

[Fig. 2] Side view showing a means for changing the biasing force of the opening regulating member

[Figure 3] Control block diagram

[Figure 4] Schematic diagram showing a table that stores torque values for initial whitening processing

[Figure 5] Simplified graph showing the change in torque value for initial whitening treatment at each level

[Figure 6] Flowchart showing the flow of control

[Figure 7] Flowchart showing the flow of control

[Figure 8] Flowchart showing the flow of control

[Figure 9] Flowchart showing the flow of control

[Figure 10] Flowchart showing the flow of control

[Figure 11
]Flowchart showing control flow

[Figure 12] Flowchart showing the flow of control

[Figure 13] Flowchart showing the flow of control

[Figure 14] Flowchart showing the flow of control

[Figure 15] Graph showing the relationship between the polishing process and the value detected by the torque sensor

Claims (4)

[Claims] Claim 1: A rice milling machine comprising the following configuration; a) a milling chamber equipped with milling rolls that polish brown rice into white rice; b) brown rice supply means for supplying brown rice to the milling chamber; c) the milling chamber. d) Internal load detection means for detecting the internal load of the whitening room; e) Controlling the polished rice outflow adjustment means according to a value detected by the internal load detection means; f) Comparing the latest internal load detection data with a threshold value, which is provided in the control means and is calculated based on the internal load detected a predetermined time ago, and determines the end of the main whitening process. A means for determining the end of the main whitening process. 2. The main whitening process end determining means calculates the threshold by multiplying a moving average value of the internal load detected a predetermined time ago by a coefficient of 1 or less. Rice milling machine. 3. The rice milling machine according to claim 1, wherein the latest internal load detection data to be compared is an average of a plurality of latest detection values. 4. The rice milling machine according to claim 1, wherein the internal load detection means is constituted by a torque sensor that detects the torque of the rotating shaft of the milling roll.