JPH0734869B2 - Control device of rice mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a control device for a rice milling machine, and more particularly to improvement of rice milling pressure control.

[Conventional technology]

Generally, in a circulation type rice milling machine, rice is pressure-fed to a pressure chamber of the rice milling machine by a rice milling screw, and at that time, a resistor is moved to adjust the rice polishing pressure of the pressure chamber. Conventionally, the adjustment of the rice polishing pressure, that is, the movement of the resistor, depends on the feeling of the operator, and as a result, it is not possible to finish the desired smashed rice due to differences in rice quality, water content, green rice content, etc. It was difficult.

[Problems to be solved by the invention]

An object of the present invention is to provide a control device for a rice polishing machine that automatically controls the rice polishing pressure, the configuration of which is shown in FIG.

That is, a control device for controlling a rice milling machine that includes a main motor for driving a rice milling screw that pumps rice into a pressure chamber and an auxiliary motor for driving a resistor that adjusts the whitening pressure in the pressure chamber. Therefore, the auxiliary motor is turned on, the auxiliary motor is turned on until the load of the main motor reaches the first predetermined value, and the load of the main motor becomes the first predetermined value. When the auxiliary motor is turned off and the resistance of the main motor is fixed until the load of the main motor reaches the second predetermined value, the auxiliary motor off means is provided. In the control device of the rice milling machine for adjusting the whitening pressure, the auxiliary motor-off means determines the second predetermined value corresponding to the first predetermined value, and the load of the main motor is the second. Predetermined value When the first predetermined value is reached, the first predetermined value is changed to another value, and a further second predetermined value is determined corresponding to the changed first predetermined value. A control device for a characteristic rice milling machine is provided.

[Work]

According to the above configuration, the resistor is appropriately moved, and therefore the rice polishing pressure is appropriate.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an overall configuration diagram of a rice polishing machine according to the present invention. Second
In the figure, 1 is a rice polishing tank into which rice 2 is put, and a rice polishing screw 4 is provided in communication with a bottom portion 3 thereof. The screw 4 is driven by a main motor 5. Reference numeral 6 is a sugar removal net, and 7 is a circulation shutter for opening and closing the communication passage of the bottom portion 3. Reference numeral 8 is a resistor for adjusting the pressure in the pressure chamber 9 at the outlet of the communication passage of the bottom portion 3, which is advanced or retracted by the auxiliary motor 10 (see FIG. 3).
That is, the resistor 8 advances (forward rotation) or retracts (reverse rotation) about the rotation axis 8a. Further, 11 is a white rice discharge port, and 12 is an electric equipment box, which incorporates the control circuit shown in FIG. In addition, this control circuit has a lamp that indicates that rice is being polished.
13, display 14 for displaying the desired whiteness, key operation panel 15 for inputting various commands and data (all see FIG. 5)
Etc. are also connected. Further, 16 is a stake amount sensor for detecting the swell amount of rice in the rice polishing tank 1, and is constituted by, for example, a pressure sensor or the like.

In the rice milling machine of FIG. 2, the flow resistance of the grain is adjusted by adjusting the resistor 8 under the drive of the main motor 5, whereby rice polishing is performed. The control circuit 12 controls the auxiliary motor 10 for adjusting 5 and the resistor 8.

The operation of the circulation shutter 7 and the resistor 8 in FIG. 2 will be described with reference to FIG. In FIG.
The circulation shutter 7 is in the fully opened state, and the resistor 8 is in a position slightly advanced from the backward end (see the dotted line in FIG. 4). The stopper 21 is fixed to the end of the open movement of the circulation shutter 7, so that the circulation shutter 7 does not open beyond the state shown in the figure. The circulation shutter 7 is rotatable about its rotation shaft 7a, and one end thereof has a long hole 22a of the link bar 22.
Is provided with a pin 7b. On the other hand, an extension 8b is fixed to one end of the rotary shaft 8a of the resistor 8, and a resistor advancing link 24 is rotatably supported. The resistor advancing link 24 is connected to the link bar 22 by a fulcrum shaft. Further, the screw 10a of the auxiliary motor 10 is coupled to the link pin 24a of the resistor advancing link 24. Therefore, the circulation shutter 7 and the resistor 8 can be moved forward and backward by moving the resistor advancing link 24 forward and backward by the auxiliary motor 10.

That is, in the illustrated state, the resistor advancing link 24 is advanced to the extent that the circulation shutter 7 just hits the stopper 21, but in this case, there is no increase in load due to the advancing of the resistor 8, that is, this advancing It is not to the extent that the flow path of rice grains is narrowed to increase the resistance, and thus to the extent that the rice polishing action is enhanced. In this state, when the auxiliary motor 10 is rotated in the normal direction, the circulation shutter 7 is in contact with the stopper 21.
Even if 22 moves forward, the pin 7b moves against the tensile force of the spring 23 and moves only in the elongated hole 22a of the link bar 22, but the circulating shutter 7 does not move forward, but the resistor 8 moves forward and the flow path of rice grains is passed. Narrowing, the pressure in the pressure chamber 9 is increased to enhance the rice polishing action. Conversely, when the auxiliary motor 10 is rotated in the reverse direction in the illustrated state, the link bar 22 is retracted and the pin 7b is moved by the elongated hole 22a of the link bar 22, so that the circulation shutter 7 is retracted and the resistor 8 Can retreat. The resistor 8 is retracted by the pressure of rice. That is, as shown by the arrow in FIG. 4, the resistor 8 retreats to the retreat terminal end due to the pressure that the rice 2 moves.

Referring to FIG. 5, the load current Il of the main motor 5 is supplied to the A / D converter 1201 via the current detector 1200, and the output of the stuck amount sensor 16 is supplied to the A / D converter 1202. The power supply 17 is supplied to the A / D converter 1204 after being lowered in voltage by the transformer 1203. The input of the power supply 17 is for determining whether the power supply 17 is a 50 Hz power supply or a 60 Hz power supply by measuring the time between peaks of the output waveform from the transformer 1203. The fixed data (table) such as the fixed value and the reference value of the load current Il of the main motor 5 is switched or corrected, but a manual switch may be provided and supplied to the input / output interface 1205.
It should be noted that in the embodiments described later, the description of switching between 50 Hz and 60 Hz is omitted.

In addition, the input / output interface 1205 has an auxiliary motor 10
Drive circuit 12 for forward (forward) or reverse (backward) rotation
06, a drive circuit 1207 for driving the lamp 13, a drive circuit 1208 for driving the display 14, a key control circuit 1209 for controlling the input of the key operation panel 15, etc. are connected. In addition, the 1210
Control circuit 1 based on the program and fixed data in ROM1211
2 CPU that controls the whole, 1212 stores temporary data
RAM.

Next, the operation of the control circuit shown in FIG. 5 will be described.

FIGS. 6A and 6B are flowcharts showing the first embodiment, and FIG. 7 is a load characteristic diagram thereof. This routine is started, for example, by turning on a rice polishing start button (not shown). In step 601, the load current value If and the rice polishing time To of the main motor 5 for fixing the resistor 8 are fixed.
Is calculated using the map stored in the RAM 1211 according to, for example, the amount of swelling data that is the A / D conversion value of the amount of swelling sensor 16, the desired whiteness data input from the key operation panel 15, etc.
Also, the timer counter T is reset. Next, in step 602, the main motor 5 is turned on to rotate the rice polishing screw 4. As a result, the rice 2 is shown in FIG.
It moves as shown by the arrow in FIG.
Next, at step 603, the auxiliary motor 10 is rotated in the forward direction to advance the resistor 8 to raise the pressure in the pressure chamber 9.
This corresponds to the operation at time to in FIG.
At this time, the lamp 13 is turned on to indicate that rice is being polished.

Next, at step 604, the load current value Il of the main motor 5 is
It takes in and waits until it reaches the fixed load value If calculated in step 601.

When the load current Il of the main motor 5 reaches a fixed load value If, the process proceeds to step 605 (corresponding to time t ₁ of FIG. 7) to forward the stopping of the auxiliary motor 10.

Next, at step 606, the load current value Il of the main motor 5
The upper limit reference value I _R of I _R ← α ・ If where α> 1 is calculated. Note that I _R may be larger than If by a predetermined amount. Then, in step 607, the load current value Il of the main motor 5 is taken in, and the process waits until the upper limit reference value I _R calculated in step 606 is reached.

When the load current Il of the main motor 5 reaches the upper limit reference value I _R, the process proceeds to step 608, the auxiliary motor 10 is reversed resistor 8 is retracted together (corresponding to time t ₂ of FIG. 7),
At step 609, the fixed load value If is decreased by a predetermined amount β.

Next, at step 610, the load current value Il of the main motor 5 is
It takes in and waits until it reaches the new fixed load value If (corresponding to If 'in FIG. 7) calculated in step 609.

When the load current Il of the main motor 5 reaches the fixed loading value, the process returns to step 605 (corresponding to the time t ₃ of Figure 7) to reverse the stopping of the auxiliary motor 10.

Hereinafter, the flow of steps 605 to 610 is repeated, and therefore,
The fixing and retracting of the resistor 8 are repeated. That, in which when it reaches the upper limit value I _R in which there is a load current value Il of the main motor 5, a fixed load value If of the resistor 8 as is lowered.

As described above, according to the routine of FIG. 6 (A), even if the rice is soft rice from which the bran is easily peeled off, the rice is not polished under high pressure, the quality of the finished rice is high, and the rice polishing efficiency is high. Get better. Further, when a small amount of rice is polished, a high load occurs. Therefore, since the time for one cycle is short, the rice polishing action per weight is high, and the quality of the finished rice is greatly deteriorated. Even in such a case, the rice polishing pressure can be reduced, so that the quality deterioration of the finished rice can be minimized.

The rice polishing is stopped by a timer routine shown in FIG. 6 (B) which is executed every predetermined time. In step 611,
The timer counter T is incremented by +1. Then step
At 612, it is determined whether the timer T has reached the rice polishing time To. As a result, if T ≦ To, the routine proceeds to step 614 and this routine is ended. On the other hand, when T> To, the process proceeds to step 613, where the rice finishing process is performed, that is, the auxiliary motor 1
If 0 is on, it is turned off, then the main motor 5 is turned off, and the indicator lamp 13 is turned off. Further, a flag for ending the routine of FIG. 6 (A) is set. Then, this routine ends at step 614.

A flag for terminating the routine of FIG. 6 (A) is "1" everywhere in steps 605 to 610 of FIG. 6 (A).
There is a step to determine whether or not
When the rice-finishing process is performed by the timer routine of FIG. 6 (B), the routine of FIG. 6 (A) is also automatically terminated.

In addition, when hard rice requires high power for milling, that is, the occurrence of bran is small, and therefore the load current of the main motor 5 is small.
If the rising phenomenon of Il does not occur, step 608 may be omitted in the first embodiment so that the resistor 8 is not retracted. In the case of such hard rice, as shown in FIG. 8, when the load current Il of the main motor 5 does not increase within a predetermined time T _1, for example, 5 minutes, the fixed load value If is set to I
The resistor 8 may be further advanced by raising it to f ′, or the resistor 8 may be retracted and advanced when an upper limit value or a lower limit value is set and above or below.

In FIG. 6 (A), the load current of the main motor 5
Although various determinations are made based on the absolute value of Il, as shown in FIG. 9, the relative change Δ of the deep current Il at each predetermined time Δt.
You may perform the said discrimination by Il.

FIG. 10 is a flow chart showing the second embodiment.
Figure 11 is the load characteristic diagram. This routine corresponds to FIG. 6 (A). That is, in step 1001, the two fixed load values If ₁ and If ₂ , the upper limit load value I _R1 , the lower limit load value I _R2 and If, and the rice polishing time To of the main motor 5 are A / D converted by, for example, the sticking amount sensor 16. The map is stored in the ROM 1211 according to the value of the amount of swelling data, the desired refinement degree data input from the key operation panel 15, and the timer counter T is reset. Note that each of the values If ₁ , If ₂ , I _R1 , I _R2 may be separately prepared by a map, or only one value may be prepared by a map and the other values may have a certain functional relation (e.g. The difference, the geometrical relationship) or the like may be used. For example, the value I
Only _R2 may be obtained by a map, and the other values If ₂ , If ₁ , I _R1 may be obtained by If ₂ ← I _R2 + δ If ₁ ← I _R2 + 2δ I _R1 ← I _R2 + 3δ. In any case, the relationship of I _R2 <If ₂ <If ₁ <I _{R1 is} satisfied.

Next, in step 1002, the main motor 5 is turned on to rotate the rice polishing screw 4, and in step 1003, the auxiliary motor 10 is normally rotated to advance the resistor 8 and the pressure chamber 9
Increase the pressure of. This corresponds to the operation at time to in FIG. Also at this time, the lamp 13 is turned on to indicate that rice is being polished.

Next, in step 1004, the load current value of the main motor 5 is 1 l.
It takes in and waits until it reaches the _first fixed load value If ₁ calculated in step 1001.

When the load current value Il of the main motor 5 reaches the _first fixed load value If ₁ , the process proceeds to step 1005, and the normal rotation of the auxiliary motor 10 is stopped (corresponding to time t ₁ in FIG. 11).

Next, at step 1006, the load current value Il of the main motor 5 is taken in and it is determined whether or not the upper limit reference value I _R1 has been reached. On the other hand, at step 1009 it is determined whether or not the lower limit reference value I _R2 has been reached. Determine.

As a result, the load current value Il of the main motor 5 becomes the upper limit reference value _IR1.
When the auxiliary motor is reached, go to step 1007
10 is reversed to move the resistor 8 backward (corresponding to time t ₂ in FIG. 11), then in step 1008, the load current value Il of the main motor 5 is taken in and the first fixed load value If ₁ is reached. Wait to do. When the load current value Il of the main motor 5 reaches the _first fixed load value If ₁ , the process returns to step 1005 and the reverse rotation of the auxiliary motor 10 is stopped (corresponding to time t ₃ in FIG. 11).
When the load current value Il of the main motor 5 reaches the lower limit reference value I _R2 , the process proceeds to step 1010, the auxiliary motor 10 is normally rotated to move the resistor 8 forward, and then in step 1011,
The second fixed load value is obtained by taking in the load current value Il of the main motor 5.
Wait for If ₂ . Then, when the load current value Il of the main motor 5 reaches the _second fixed load value If ₂ , step 1
Returning to 005, the normal rotation of the auxiliary motor 10 is stopped.

After that, the flow of steps 1005 to 1011 is repeated, so that fixing and retracting (or advancing) the resistor 8 is repeated.

In addition, every step of steps 1005 to 1011 of the routine of FIG. 10 is provided with a step of determining the flag set when the above-mentioned rice-polishing termination processing of FIG. 6 (B) is performed. After the rice-polishing termination process is performed by the routine of FIG. 6 (B), the routine of FIG. 10 is also automatically terminated.

Further, in the routine of FIG. 10, two load values If ₁ and If ₂ are provided to fix the resistor 8, but as shown in FIG. 12, if (= If ₁ = If ₂ ) Can be expected to operate in the same way.

Further, the rice polishing time or the rice polishing end timing is the relative change amount (ΔIl ₁ −ΔIl ₀ ) of the load current value Il shown in FIG.
Alternatively, the relative change value of time (T ₂ −T ₁ ) shown in FIG. 11 can be used as a control parameter, and the number of times of resistor movement and fixation shown in FIG. 11 can be used as a control parameter. .

Further, although the pressure sensor is used as a means for detecting the amount of rice swelling described above, the time until the load of the main motor 5 reaches the maximum load or the predetermined load after the start of rice polishing, the advance distance of the resistor 8, It can also be detected indirectly by the angle of advance. This utilizes a phenomenon that when the amount of stake is small, the weight of rice and the slip resistance in the tank are small when the load is controlled to a predetermined load, and the amount of advance of the resistor must be increased. For this purpose, for example, it is necessary to provide a micro switch for detecting the position of the resistor 8 and a rotary encoder for detecting the angle of the resistor 8.

Furthermore, the rice-polishing termination treatment can also indirectly or directly detect the degree of whitening of rice and terminate the rice-polishing based on this.

Further, in the case of paddy polishing, the opening of the circulation shutter must be opened wider than in the case of brown rice, which causes clogging. To prevent this, the discrimination control can be automatically performed. In other words, after starting, rice milling control is performed with a fixed load (not necessarily the maximum value), and if the load fluctuation at that time is paddy, this is because the fluctuation range of the load is large, such as maximum and minimum, compared to the load fluctuation of brown rice. Is compared with the swing width in the case of brown rice (each swing width is held in RAM as data), and if it is large, it is discriminated as paddy. Thereby, the opening of the circulation shutter (large opening) in the case of paddy or the opening (medium opening) in the case of brown rice can be selected and controlled by using a motor or a solenoid as power. Further, it is possible to control the rice to be fully opened at the beginning of rice polishing and to open the rice to an intermediate degree when the rice is brown rice based on the discrimination of the brown rice and to open the rice as it is when the rice is rice. Discrimination between paddy and brown rice may be compared and discriminated by focusing on the fact that the load decrease in the fixed resistance state after reaching the set load is larger in the case of paddy than in the case of brown rice. Alternatively, the user may select and input with a switch.

In addition, if a significantly low load, that is, a light load level of the main motor (for example, a load level close to the load when the milling screw idles due to clogging of the circulation shutter and loss of rice circulation), the resistor is detected. For preventing the resistor moving motor from stopping remarkably, or if the set load reference value is not changed for 5 minutes after starting, for example, unstable resistor moving control Can also be prevented.

〔The invention's effect〕

As described above, according to the present invention, since the load of the main motor is automatically controlled, conventionally, especially in the case of rice polishing from paddy (usually rice polishing from brown rice), several minutes after starting. Circulation flow in the rice polishing tank becomes unstable due to the occurrence of rice bran or debris.For example, if a clogging occurs near the circulation shutter, the load on the main motor may temporarily be extremely low and a light load condition near idling may occur. In response to this, the resistor will advance due to the action of automatic control, and then when the normal circulation flow again causes the resistor to advance, a significant overload will occur and an overload stop device (thermal, Although a breaker or the like) causes the main motor to stop, the present invention can prevent the main motor from stopping due to such a significant overload.

Further, conventionally, in the rice milling machine that sets the whitening pressure at the start of rice polishing in accordance with the load of the main motor and executes the rice polishing control through the set value set in this way, the water content and Due to factors such as quality, there was the inconvenience that there was a gap between the set value set at the time of rice milling disclosure and the optimum value suitable for the rice actually milled, but according to the present invention, it was set at the start of rice milling. If the fixed load value exceeds the limit value, the fixed load value itself is automatically changed, so even if the same type of rice is used, the optimum polishing The pressure can be automatically adjusted, the desired degree of milling depending on the rice actually milled is guaranteed, and the finish and yield of the milled rice can be greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is an overall configuration diagram of a rice polishing machine according to the present invention, FIG. 3 is a partial detailed view of FIG. 2, and FIG. 4 is a resistor of FIG. 5 is a detailed block circuit diagram of the control circuit of FIG. 2, and FIGS. 6 (A) and 6 (B) show the operation of the control circuit according to the first embodiment of the present invention. FIG. 7 is a flow chart showing the load characteristic diagram for supplementarily explaining the operation of FIGS. 6 (A) and 6 (B), and FIG. 8 and FIG. 9 are load characteristic diagrams for explaining the modification of FIG. FIG. 10 is a flow chart showing the operation of the control circuit as the second embodiment of the present invention, FIG. 11 is a load characteristic diagram for supplementarily explaining the operation of FIG. 10, and FIG. 12 is a modification example of FIG. It is a load characteristic figure demonstrated. 1 ... rice polishing tank, 2 ... rice, 4 ... rice polishing screw, 5 ... main motor, 8 ... resistor, 9 ... pressure chamber, 10 ... auxiliary motor, 16 ... extension amount sensor.

Claims (3)

[Claims] 1. A rice milling machine comprising a main motor for driving a rice milling screw for pumping rice into a pressure chamber and an auxiliary motor for driving a resistor for adjusting the whitening pressure in the pressure chamber. A control device for turning on the auxiliary motor and moving the resistor until the load of the main motor reaches a _first predetermined value (If, If ₁ , If ₂ ); When the load of the main motor reaches the first predetermined value, the auxiliary motor is turned off, and the load of the main motor is changed to the second predetermined value (I _R , I _R1 , I
_R2 ) until it reaches the _R2 ) auxiliary motor off means for fixing the resistor, in the controller of the rice milling machine for adjusting the whitening pressure in the pressure chamber by moving and fixing the resistor, the auxiliary The motor-off means determines the second predetermined value in correspondence with the first predetermined value, and has a function of determining the first predetermined value when the load of the main motor reaches the second predetermined value. And a function of determining a further second predetermined value corresponding to the changed first predetermined value. 2. The second predetermined value (I _R ) is set to be larger than the first predetermined value (If) by a predetermined ratio (α) or a predetermined amount, and the load of the motor is set to the second predetermined value. The control device according to claim 1, wherein the first predetermined value is decreased when the value is reached. 3. The second predetermined value (I _R ) is set smaller than the first predetermined value (If) by a predetermined ratio (α) or a predetermined amount, and the load of the motor is set to the second predetermined value. The control device according to claim 1, wherein the first predetermined value is increased when the value is reached.