JPH0775672B2 - Resistor control device for circulating rice mill - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistor control device for a recycle type rice milling machine that automatically moves a resistor in a grain circulation path to automatically adjust the whitening power.

[0002]

2. Description of the Related Art Generally, in a circulating type rice milling machine, as the time passes and the rice polishing progresses, the flow resistance of the grain tends to decrease and the whitening power tends to decrease. For this reason, it has been known to detect a load current of a rice-polishing motor that rotates a rice-polishing screw and automatically move a resistor based on the detected value to keep a whitening power constant ( For example, JP-A-57-219
42 publication).

[0003]

In the rice milling machine with the automatic whitening force adjusting mechanism for automatically moving the resistor as described above, conventionally, for example, the rice milling motor is turned off during the operation and the operation is once performed. When restarting after interruption, the resistor is in the forward position and is in a state of adding a large resistance to the grain, so if the initial resistance when restarting the operation is added to this, the rice polishing motor falls into an overload state. , The milled rice screw was sometimes unable to rotate. Not only when the operation is restarted after such an interruption, but when the operation is started in the state where the resistor protrudes into the grain circulation path and applies a resistance (or load) to the grain, conventionally, the motor for rice polishing is overloaded. Inevitably suffering from the drawback of locking, especially when the grain is put into the rice polishing tank with the circulation shutter on the entrance side of the rice milling screw open and the start switch is turned on, or when the milled rice has a high water content, There was a stronger tendency for the rice milling motor to become overloaded. Therefore, the present invention has been made in view of such a conventional problem, and it is an object of the present invention to reduce the initial resistance due to the protrusion of the resistor, which tends to occur at the time of starting, to prevent the overload of the rice polishing motor. Lock (non-rotatable)
It is an object of the present invention to provide a resistor control device capable of solving the above problem and smoothly starting the rice polishing machine.

[0004]

In order to achieve the above object, the present invention provides a circulating type rice milling machine which automatically adjusts the whitening power with a resistor mounted so as to project or retract in a grain circulation path, a support bar which operates at the resistor moving motor, the pivotally resistor moving rod of the resistor and integrally attached abutting stopper resistor moving rod to the support bar, 該Su
The topper rotates the resistor in the backward direction with respect to the support bar.
The movement is restricted and the rotation in the protruding direction is free . Further, in the above support bar, a flow detection limit switch capable of coming into contact with and separating from the resistor moving rod is arranged on the support bar.

[0005]

When the rice-polishing motor 5 is rotated by the rice-polishing motor M, the grains in the rice-polishing tank 7 are forcibly circulated in the directions of the arrows in FIGS. 2 and 3 , and the resistor 3 adds resistance to the grain flow,
The whitening power is adjusted by changing the protruding amount of the resistor 3. The resistor moving means 4 for changing the protrusion amount is carried out by rotating the resistor moving motor m forward and backward. When the resistor moving motor m is rotated forward, the support bar 15 is moved by the screw rod 14 as shown in FIG. Move to the position indicated by the dotted chain line, and support bar 1
The stopper 20 fixed to 5 hits the resistor moving rod S and pushes the resistor moving rod S to cause the resistor 3 to project, and acts in the direction of pressing against the flow of rice to refine the grain. When the resistance moving motor m reversely rotates, the support bar 15 is retracted by the screw rod 14. However, when rice is stagnant in the machine and is not flowing,
The resistor 3 large transfer resistance, even stopped at the projection position can not be retracted as shown in FIG. 4, it is possible to retract only the support bars 15 the support bar rotation axis 17 as a fulcrum, the resistance member movement The motor m can turn around the support shaft 13 and reach the limit switch LS1 with a light load. This turns on the limit switch LS1.
Then, the rice milling operation is started when the timer TM is activated, the rice milling screw 5 rotates and the rice circulates, and the rice on the upper surface side of the protruding resistor 3 also rises (broken line in FIG. 3 ) . see arrows), resistor 3-free state can be moved to the retracted position by lightly rotating, it is possible to prevent overloading of rice motor M.

[0006]

【Example】

The configuration of the present invention will be described in detail with reference to the embodiments shown in the drawings. That is, the present invention relates to a circulation type rice milling machine that automatically adjusts the whitening power by projecting or retracting a resistor in the grain circulation path, and a switch 1 for starting the rice milling machine as shown in FIG.
Timer circuit 2 which outputs a resistor retreat signal for a fixed time based on the closing signal of the above, and outputs a motor start signal after the fixed time.
And a resistor moving means 4 for retracting the resistor 3 based on the resistor retract signal, and a rice polishing motor M for starting rotation of the rice polishing screw 5 based on the motor start signal. FIG. 2 shows the entire circulation type rice milling machine . Reference numeral 7 denotes a rice polishing tank. A rice polishing screw 5 is horizontally installed in a rice polishing chamber communicating with the bottom of the rice polishing tank, and a rice polishing motor M is connected to one end thereof. Reference numeral 8 indicates a bran-removing net. Reference numeral 9 is a circulation shutter for opening and closing the entrance of the rice polishing chamber, and 3 is a resistor facing the pressure chamber 11 on the outlet side thereof. The resistor is rotatably mounted around the base shaft 12 as a fulcrum, and the resistor moving means 4 of the resistor 3 is provided. As shown in FIG. 3 , the resistor moving rod S is integrally connected to the resistor 3 via the base shaft 12, and the base bar of the resistor moving rod S is connected with the support bar 15 at the base end portion thereof. Support bar rotating shaft 17 provided at the tip
Rotatably connect. A stopper 20 for hitting the resistor moving rod S is attached to the tip of the support bar 15, a limit switch LS3 for flow detection is fixedly attached, and the actuator is made to face the resistor moving rod S to move the support bar 15 and the resistor. A tension spring 18 and a compression spring 19 are interposed between the rod S and the rod S. The tension spring 18 pulls the resistor moving rod S with a weak force and stops the deflection of the resistor 3. Further, a resistor moving motor m is rotatably mounted around the support shaft 13, and a screw rod 14 rotated by the resistor moving motor m.
With a screw pin 1 at one end of the support bar 15 of the resistor 3.
6 and the resistor moving motor m is rotated in the normal or reverse direction to move the screw pin 16 back and forth along the screw rod 14 to move the support bar 15 and the resistor 3 up to the position of the one-dot chain line in FIG. It moves forward into the flow path of the grain, or moves backward to the position of the solid line (however, the resistor 3 is shown by the broken line). Further, a backward position detecting limit switch LS1 for detecting the backward position of the resistor 3 and a forward stopping limit switch LS.
2 are respectively fixed to the upper and lower positions of the mounting frame 22 of the resistor body moving motor m. In the figure, reference numeral 23 is a white rice discharge port, and 25 is an electrical equipment box in which a later-described control circuit shown in FIG. 5 is installed. When the start switch 1 is turned on to start the operation of the rice milling machine, a closing signal is output and the timer circuit 2 outputs a resistor retreat signal for a predetermined time T, whereby the resistor moving means 4 causes the resistor 3 to move. To reduce the resistance on the grain. After a lapse of a certain time T, a motor start signal is output from the timer circuit 2, and the motor M for a rice polishing machine is started to start a rice polishing operation.

With this structure, the motor M for rice polishing
When the rice polishing screw 5 is rotated by, the grains in the rice polishing tank 7 are forcibly circulated in the directions of the arrows in FIGS. 2 and 3 , and the resistor 3 adds resistance to the flow of the grains, and the protruding amount of the resistor 3 is changed. Adjust the whitening power by changing. The resistor moving means 4 for changing the amount of protrusion is performed by rotating the resistor moving motor m forward and backward. When the resistor moving motor m is rotated forward, the support bar 15 is moved by the screw rod 14 as described above. Figure
The stopper 20 which is moved to the position indicated by the one-dot chain line of 3 and is fixed to the support bar 15 hits the resistor moving rod S and pushes it to project the resistor 3 and acts in the direction of pressing against the rice flow. And refine the grain. When the resistor moving motor m rotates in the reverse direction, the support bar 15 is retracted by the screw rod 14. However, when the rice is stagnant in the machine and is not flowing, the resistor 3 has a large moving resistance, as shown in FIG. Even if the support bar 15 stays in the projecting position without being able to retreat, the support bar 15 can withdraw only the support bar 14 with the support bar rotation shaft 17 as a fulcrum against the tension of the tension spring 18, so that the resistance moving The motor m can turn around the support shaft 13 and reach the limit switch LS1 with a light load. As a result, the limit switch LS1 is turned on, and the timer TM is actuated to start the rice-polishing operation. When the rice-polishing screw 5 rotates and the rice circulates, the rice on the upper surface side of the protruding resistor 3 is also removed. Since it circulates, the tension of the tension spring 18 allows the resistor 3 in the free state to swivel and move to the retracted position, thereby preventing the rice polishing motor M from being overloaded.
In addition to the case where the rice is stagnant in the machine in this way, the rice milling screw 5 is rotated while the circulation shutter 9 is closed, or the rice in the pressure chamber 11 is directed downward by opening the white rice discharge port 23, Alternatively, even when the rice is not circulating properly, such as when the rice is not circulated correctly without being put in the rice polishing tank, the resistance moving rod S detects the flow due to the flow pressure of the rice received on the lower surface of the resistor 3. The elastic force of the compression spring 19 acts more strongly than the force pressing against the limit switch LS3, and the resistor moving rod S is pushed back to the position shown by the one-dot chain line Sa in FIG. Move away from the LS3 actuator. Thereby, the limit switch LS3 can detect whether or not the rice is properly circulated. In particular, in this embodiment, a special member for operating the limit switch LS3 in response to the flow of rice is not specially provided, and this is performed by the resistor 3, so that there is no need to increase the parts inspection and there are few failures. There is.

Next, the circuit diagram of FIG. 5 will be described. 30 is an AC power supply, 31 is an overload prevention relay, 32 is a fuse, 33
Is a transformer, 34 and 35 are diode bridges, 36 is a constant voltage circuit, 37 is a power switch, and 38 is a current transformer for detecting a load current. Reference numerals 39 and 40 are two-stage contacts of the startup timer TM. When the startup timer TM is set, the break contact 39 is turned on and the make contact 40 is turned off. Contact point 39 when time T2 elapses
Turns off. Reference numerals 41 to 46 denote comparators to which two reference voltages and signal voltages are input. Reference numerals 48, 49 and 50 are switches for switching the resistors 51, 52 and 53, and the comparator 4
Change the reference voltage of 3, 44. A capacitor 56 and a resistor 57 form a differentiating circuit, a resistor 58 and a resistor 59 form a voltage dividing circuit, a resistor 57 and a resistor 61 form a voltage dividing circuit, and a resistor 62 and a diode 63 form a discharging circuit of the capacitor 56. The self-holding circuit of the comparator 41 is formed by 64 and the diode 65. Reference numerals 66 and 67 are light emitting diodes for monitoring, which indicate whether the resistor moving motor m is rotating normally or reversely. 68, 69 and 70 are transistors for switching, 71 is a resistor moving motor m
Is a relay for switching the contact 72 for reverse rotation, 73 is a relay for switching the contact 74 for forward rotation, and 75 is a relay for switching the motor opening / closing contact 29 for rice polishing. The diode 77 is for self-holding the comparator 42, and
Silicon diodes are used for the diodes of 4, 65, 77 and the line 60. In the figure, LS4 is a limit switch for detecting the opening / closing of the circulating shutter 9, which detects the opening / closing of the circulating shutter 9. First, the power switch 37 is closed, and then the knob of the start timer TM is set. When the timer TM is set, the contact 39 is turned on and the contact 40 is turned off as described above, so that power is supplied to the line 80 and each comparator is activated. At this time, when the resistor 3 is neither at the limit position where the resistor 3 can move forward nor at the limit position where the resistor 3 can move backward, that is, when the resistor 3 can move back and forth, the mounting frame 22 of the resistor moving motor m is not limited to the limit switch LS1 or LS2. Without contact, all of these limit switches are closed. When there is rice in the tank 7 and the flow detection limit switch LS3 is pushed by the resistor moving rod S to open, as shown in the time chart of FIG.
Within a time T when the input voltage A from the differentiating circuit of the capacitor 56 and the resistor 57 is larger than the reference voltage B divided by the resistor 58 and the resistor 59 of 1, the output of the comparator 41 is H (high level). The output of the comparator 43 becomes L (low level), the transistor 68 becomes conductive, the relay 71 operates, the contact 72 for reverse rotation closes, and the resistor moving motor m reverses.
As a result, the resistor 3 retracts, and when the mounting frame 22 touches the retracted position detection limit switch LS1 to turn it off and the resistor moving motor m is de-energized, the resistor 3 stops.
At this time, if the resistance value of the resistor 57 is changed and the time constant of the differentiating circuit of the resistor 56 of the capacitor 56 is changed, the reverse rotation time of the resistor moving motor m can be arbitrarily set. Next, when the above-mentioned time T elapses and the input voltage A becomes smaller than the reference voltage B, the output of the comparator 41 becomes the L level and the comparator 42 described later.
With the action of the relay 75, the rice milling motor M is started and the motor load detection signal of the current transformer 38 for load detection is input to the comparators 43 and 44 via the line 81. Then, these comparators 43 and 44 compare with the reference voltage, and as a result, the switching transistor 68
Relays 71 and 73 are actuated by and 69 to connect and disconnect the contacts 72 and 74 to normally or reversely rotate the resistor moving motor m, whereby the resistor 3 is projected or retracted to automatically adjust the whitening force. The comparator 43 is for controlling the resistance moving motor m in the reverse direction so as to reduce the flow load of the grain, and the comparator 44 reversely rotates the resistance moving motor m for increasing the load. It is for controlling to the direction.
Here, the reference voltage P for comparison in the comparator 43 is set higher than that in the comparator 44, and when the value V on the line 81 is higher than this reference voltage P, the resistor moving motor m is reversed and the comparator When the value V of the line 81 is lower than the reference voltage Q at 44, the resistor moving motor m is rotated in the forward direction to move the resistors 3 backward or forward. There is a dead zone between the reference voltages P and Q of the comparators 43 and 44, and the line 8
When the value t of 1 is within the range, the drive signal to the resistor moving motor m is not output. This dead zone is the control target load zone to be added to the grain. Also switches 48, 49, 5
By changing the resistance value by 0 and changing the reference voltage appropriately, the target load range is set to a value according to the moisture content and grain quality of the grain. If the reference voltages P and Q are set to the same value to eliminate the dead zone width, the target load condition can be sharply controlled. When the time T1 elapses after the start-up timer TM is set, the contact 39 remains on, but the contact 40 is switched on and the signal level on the inverting input side of the comparator 45 becomes H, and the output line 60 of the output line 60 thereof is changed. The level is L (0.3v). Therefore, the non-inverting input A of the comparator 41 is 1.5v and exceeds 0.9v of the reference voltage B, so that the level at the point C on the output side of the comparator 41 becomes H, and the inverting input of the comparator 43 also passes through the diode a. It becomes H level. As a result, the base of the pnp switching transistor 68 becomes L level, and since the input on the non-inverting side of the comparator 44 is H level, its output also becomes H level, only the transistor 68 is turned on, and the relay 71 works and the contact 72 Is turned on and the resistor moving motor m is reversely rotated, whereby the resistor 3 is retracted to the minimum load state. Here, if the resistors 82 and 83 of the voltage dividing circuit of the inverting input of the comparator 42 are set to 50 kΩ, the resistor 75 of the voltage dividing circuit on the reference voltage side is set to 40 kΩ, and the resistor 76 is set to 10 kΩ,
When the output of the comparator 41 is at H level (5.0v), point E becomes 2.5v due to the voltage dividing circuit. Then, when the time T at the time of start-up has passed and the input voltage on the inverting side of the comparator 42 becomes L level and its output becomes H level, the npn switch transistor 70 is turned on and the relay 75 operates and the contact 2
9 is turned on and the rice polishing motor M starts to rotate. At this time, the forward voltage 0.6v is changed to the output voltage H level (5.
The value obtained by subtracting 4.4 v from (0 v) is held as the reference voltage of the comparator 42. Therefore, even if the time T1 has elapsed from the timer TM setting and the point C becomes the H level, the point E is divided and the output is 2.5v, so the output of the comparator 42 is still at the H level, and the rice polishing motor M is After time T1, it continues to rotate and circulates rice. Thus, after the start timer TM is set, when the time T1 elapses, the grain circulates in the state where the resistor 3 remains retracted under the minimum load state, so that the rotation of the rice polishing screw quickly removes bran on the grain surface. It is done and polished well (bran cycle). When the flow detection limit switch LS3 is closed without the rice circulating, the line 81 goes to the H level, which is input to the inverting side of the comparator 43, so that its output goes to the L level and the transistor 68.
Is turned on, the relay 71 is actuated, the contact 72 is turned on, and the resistor moving motor m is rotated in the reverse direction. Center is threaded pin 16 by the reverse rotation of the resistor moving motor m is also retracted support bars 15 when retracted, if there is no rice flow, as shown in FIG. 4, the support bar 15 is a support bar rotary shaft 17 Retreat as. This is because the resistor 3 is in the rice that does not flow and a high load is applied to the movement. Then, when the time T2 elapses after the start timer TM is set and the break contact 39 of the start timer TM is turned off, the relay 75
Is demagnetized, the contact 29 is turned off, and the rice polishing motor M is stopped. The limit switch LS4 for detecting the opening / closing of the circulation shutter 9 is turned on when the circulation shutter 9 is closed, the line 85 is at the H level, and the reference voltage of the comparator 46 is at the H level. Therefore, the line 81 also becomes H level, and the comparator 43 operates to forcibly retract the resistor 3. Therefore, when the circulation shutter 9 is opened again, the rice polishing motor M is not overloaded and the operation is continued without any trouble. When the circulation shutter 9 is opened, the limit switch LS4 is turned off, the line 85 becomes L level, and the line 81 also becomes L level.
Is automatically controlled as usual. When the circulation shutter 9 is closed, the limit switch LS4 is actuated to neither move the resistor 3 forward nor backward, but to fix the resistor 3 in the same position, it is possible to avoid overload when the shutter 9 is restarted. A solenoid may be used to move the resistor 3 as well as a motor, and a contactless one such as a photoelectric conversion element or a reed switch may be used to detect the position of the resistor 3 without being limited to a limit switch. Good.

[0009]

In summary, according to the present invention, the resistor moving rod integrated with the resistor is pivotally attached to the support bar operated by the resistor moving motor, and the stopper is brought into contact with the resistor moving rod. Attach the support bar by the stopper
Restricts the backward rotation of the resistor against the
It is configured so that it can freely rotate to . As a result , even when rice is stagnant in the machine and does not flow at the time of starting, it is possible to leave the resistor in the protruding position and retract only the support bar, so the resistor moving motor does not become overloaded and is light Can operate After the rice-polishing motor is started, the resistor retracts without resistance, so the rice-polishing motor can be rotated without hindrance, and the rice can be smoothly milled without becoming inoperable. This is an effect that even a simple operator can easily operate.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 is an overall side view showing a cross section of a main part of a rice polishing machine according to the present invention.

FIG. 3 is an enlarged sectional view of an essential part according to an embodiment of the present invention.

FIG. 4 is an enlarged sectional view of an essential part according to an embodiment of the present invention.

[Figure 5] Circuit diagram

FIG. 6 is a time chart showing an input / output relationship in the comparator 41.

FIG. 7: Flow chart

[Explanation of symbols]

3 Resistor 5 Rice-polishing screw 7 Rice-polishing tank 12 Base shaft 15 Support bar 17 Support bar rotating shaft 20 Stopper M Rice-polishing motor S Resistor moving rod LS3 Flow detection limit switch

Claims (2)

[Claims] 1. A circulating rice milling machine that automatically adjusts the whitening power by a resistor mounted so as to project or retract in the grain circulation path, wherein a support bar operated by a resistor moving motor has a resistor integrated with the resistor. The body moving rod is pivotally mounted, and a stopper that abuts against the resistor moving rod is attached to the support bar .
Limiting the backward rotation of the resistor with respect to the support bar
However, the resistor control device is characterized in that it is freely rotatable in the protruding direction . 2. The resistor control device according to claim 1, wherein a flow detection limit switch capable of coming into contact with and separating from the resistor moving rod is arranged on the support bar. .