JPH0622694B2 - Overload control device for rice mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) [0001] The present invention relates to an overload control device for a rice polishing machine capable of controlling the polishing pressure when polishing brown rice.

(Prior Art) Conventionally, in a so-called circulation type rice milling machine, in order to carry out rice milling at a constant polishing pressure, a resistor is provided in the flow path of rice grains pushed out from the transfer chamber to the pressure chamber. The position was controlled so that the pressure level was constant. This control is performed by detecting the load current of the main motor that drives the Hakusei roll and moving the resistor so that the load current falls within a certain range.

(Problems to be Solved by the Invention) In the case of the above-described conventional technique, after the main motor is driven to start rotation of the milling roll, the milling pressure exceeds the control range and becomes abnormally high for some reason. May be overloaded. In such a case, if left as it is, there are problems that the rice grains are crushed and the main motor is damaged.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and an overload control device for a rice polishing machine which detects an overload of a main motor and automatically avoids this overload state. The purpose is to provide.

[Structure of Invention]

(Means for Solving the Problems) The present invention corresponds to a detecting means for detecting a load current of a main motor for driving a Seisei roll, a load current value detected by the detecting means, and an overload current. In the overload control device of the rice milling machine, which has a comparison means for comparing with a predetermined reference value and a resistance drive device for driving the resistance body in the pressure chamber according to the comparison result, a main motor for a predetermined time for polishing A main motor control means for driving the main motor and stopping the drive of the main motor when the overload state of the main motor continues for a predetermined time or longer according to the judgment of the comparison means; The resistor driven by the resistor drive device control means for retracting to a position where the resistance to rice grains is minimized, the main motor control means, If the main motor is stopped during a certain polishing time due to overload,
It has a storage means for storing the elapsed polishing time even while the main motor is stopped, outputs this elapsed time to the display means and displays it, and when the driving of the main motor is started again, the constant polishing time An overload control device for a rice polishing machine, which is characterized by driving a main motor for the remaining time.

(Operation) The overload control device for a rice polishing machine according to the present invention stops the main motor when the main motor that drives the milling roll is in the overload subordinate state for a certain period of time or more, and drives the resistor to interlock with the stop of the main motor. The device retracts the resistor to the position where the resistance to rice grains is minimized, and stores and displays the slaughter time elapsed until it stops, and the main motor is re-driven for the remaining time after the resistor is retracted. It was done.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

The rice milling machine of this embodiment is a so-called circulation type rice milling machine,
As shown in the figure, a transfer chamber 2 is provided in the upper portion of the rice milling machine main body 1, and a polishing roll 3 for pressing and transferring rice grains is rotatably mounted in the transfer chamber 2. The Seisei roll 3 is coaxially connected to a pulley 5 via a shaft 4, and the pulley 5 includes a pulley 7 of a main motor 6 and a belt 8
Are connected via.

Below the transfer chamber 2, a sugar removal net 9 is attached, and at both ends of the transfer chamber 2, pressure chambers 10 for applying a rice polishing pressure to rice grains,
And a rice grain supply port 11 are provided. This pressure chamber 1
0, above the supply port 11, a hopper 1 for storing rice grains
2 is fixed. Also. The pressure chamber 10 is rotatably mounted with a resistor 13 that gives resistance when the rice grains are refluxed and applies a polishing pressure to the rice grains by the pressing force of the rice grain roll 3. As shown in FIG. 4, the resistor 13 is rotatably provided integrally with a shaft 14 which is provided perpendicularly to the flow direction of rice grains. One end of the shaft 14 is bent to slide. It is engaged with the moving member 15. The sliding member 15 is screwed with a spiral shaft 17 that is rotated by a sub motor 16 that is a resistor driving device, and the rotation of the spiral shaft 17 causes the sliding member 15 to move in the axial direction of the spiral shaft 17 to move the shaft 14. The resistor 13 is rotated to rotate. Further, before and after the moving range of the sliding member 15, limit switches 18 and 19 are provided to detect a position where the resistor 13 retreats and does not give resistance to the rice grain and a position where the resistance becomes maximum. .

In the electric circuit of the rice milling machine of this embodiment, as shown in FIG. 1, a main motor 6 is connected to an AC 100V power source of a commercial power source via a power switch 20, and further, between the main motor 6 and the power source. Main motor drive relay 2 in series
2. A current transformer (C which detects the load current value of the main motor 6)
T) 23 is connected. The output of the current transformer 23 is converted into a digital value by the A / D converter 25 via the amplifier 24 and input to the input port 27 of the microcomputer 26. Further, a set value serving as a reference for controlling the load current value of the main motor 6, for example, one of three types of load set values shown in FIG. 6 is selectively input to the input port 27. A load setting input means 28, a rice polishing switch 29 for supporting the drive start of the main motor 6, and a limit switch 18 for detecting a retracted position (hereinafter abbreviated as O position) of the resistor 13 are connected.

The microcomputer 26 includes a CPU 30 and a ROM 3
1, a RAM 32, the output of which is connected to a sub motor drive circuit 34, an LED display, and a main motor drive relay 22 via an output port 33, each of which has a CP
It operates according to the command from U30. The microcomputer 26, the sub motor drive circuit 34, and the main motor drive relay 22 are connected to a power supply circuit 36 and receive power.

The polishing control of the rice polishing machine of this embodiment is digitally processed by the microcomputer 26, and its processing program is stored in the ROM 31 or an external memory (not shown).

As shown in the flow chart of FIG. 2 and the solid line graph of FIG. 5, the power control of the rice milling machine is first performed by the power switch 20.
When is closed, the serve motor 16 is reversed and the resistor 13
Is returned to the O position where it does not give resistance to the rice grain. In this operation, the spiral shaft 17 rotates, the sliding member 15 moves to the left in FIG. 4, and the shaft 14 rotates clockwise to rotate the resistor 13 in a direction parallel to the rice grain flow path. It is done by
Further, when the resistor 13 is in the O position, the sliding member 15
Turns on the limit switch 18, and the sub motor 16 is stopped in conjunction with this. After that, when a desired setting value of the polishing pressure is input from the load setting input means 28 and the rice polishing switch 29 is turned on, the main motor 6 is driven and the polishing roll 3 is rotated. Further, at the same time, counting of the fixed set times t ₁ and T ₁ is started, and the LED display 35 displays the elapsed time of t ₁ and T ₁ .

Then, when the rice polishing initial time t ₁ elapses, control of the polishing pressure is started. This rice polishing initial time t ₁ is 3
Is a rotation period that is sufficient for the rice grains to circulate uniformly and stably. In the precise control, the output of the current transformer 23, which is connected in series to the power supply line of the main motor 6, is amplified by the amplifier 24, is A / D converted, and is input to the microcomputer 26. Is performed by comparing the load current value and the set value. Microcomputer 2
The CPU 30 of _No. 6 does not operate the current transformer 2 after the initial rice polishing time t _1.
The load current value of the main motor 6 from 3 and the preset value of the load corresponding to the preset precise pressure are compared. If the load current value is larger than the preset value, the sub motor 16
And the resistor 13 is rotated in the direction of the O position for retracting from the rice grain flow path, and when the load current value and the set value are equal, the resistor 13 is stopped at the position as it is, and conversely the load current value is changed. When the value is smaller than the set value, the sub motor 16 is rotated in the normal direction to rotate the resistor 13 in the direction of closing the rice grain flow path. In this way, the polishing pressure of the rice grain is controlled so as to be within a certain set range, and this polishing is performed from ON of the main motor 6 to T ₁
After a lapse of time, the whitening operation ends, and the sugar removal is started.
This T ₁ hour is set to a time sufficient to carry out whitening of brown rice.

Here, while the control of the precise pressure is performed, the control of the precise pressure is not performed due to some abnormality and the main motor 6
When a load current more than the set value flows into the main motor 6 and a certain period of time elapses with the load current value exceeding a predetermined overload current value, an OFF signal is sent to the main motor drive relay 22 and the main motor 6 is stopped. To do. When the main motor 6 is stopped due to this overload, the count and display of the set time T ₁ are held as they are at the time of the stop.
This is because if the main motor 6 stops in the middle of the brewing process, it is difficult to judge how much the brewing process should be done when removing the abnormality and restarting the brewing process. Is so that it will not be cleared. Further, the sub motor 16 is rotated in reverse in conjunction with the stop of the main motor 6, and the resistor 13 is returned to the O position. Further, in conjunction with the stop of the main motor 6, a monitor lamp (not shown) indicating stop due to overload lights up.
After that, if the abnormality is checked and the rice polishing switch 29 is turned on again, the monitor lamp is extinguished and the remaining polishing work is performed.

When T ₁ time for polishing has passed, the sugar removal time T ₂ is set and the sugar removal time starts. During the sugar removal, the main motor 6 is rotated with a small load to perform the sugar removal. Therefore, first, the sub motor 16 reversely rotates and the resistor 13 returns to the O position. Then, when the predetermined sugar removal is completed, the main motor 6 is stopped.

In addition, when the power switch 20 is turned off, all the operations are stopped, and when the power switch 20 is turned on again, the sub motor 16 is always rotated in reverse, and the resistor 13 is returned to the O position and reset. To be done. The main motor 6 does not rotate even if the rice polishing switch 29 is pressed until the resistor 13 returns to the O position. Therefore, the power switch 20 is turned off to stop the lumbering halfway, and the resistor 13 is always held when the lumbering is performed again.
Is started at the O position.

Further, the power switch 20 is turned on, and a monitor lamp (not shown) is lit to display the operating condition until the sub-pressure 16 starts rotating in the reverse direction until the pressure level becomes zero.

According to the overload control device for the rice polishing machine of this embodiment, the main motor 6 is automatically stopped by detecting the overload state of the main motor 6, and the sub motor 16 is operated to bring the resistor 13 to the O position. Since it is returned, the resistance is small when the main motor 6 is driven again, and the rotation of the polishing roller 3 quickly rises.

Further, the elapsed time until the stop of the main motor 6 remains, and when the main motor 6 is driven again, the polishing is automatically performed for the remaining polishing time, so the main motor 6 is stopped in the middle. In this case, poor rice polishing does not occur.

It should be noted that the judgment of overload may be made not by digital but by comparing the load current value as it is in analog.

Further, the resistor driving device may be electromagnetic driving means such as a solenoid other than the motor.

〔The invention's effect〕

According to the overload control device of the rice polishing machine of the present invention, the overload of the main motor is detected, the main motor is automatically stopped, and the resistor is returned to the retracted position. In addition, the main motor is not damaged, and even when the main motor is re-driven, the rotation of the Seisei roll rises quickly.

Also, the elapsed time until the main motor stops remains, and when the main motor is driven again, it will automatically continue for the remaining polishing time. It also has the effect of preventing defective rice polishing.

[Brief description of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a flow chart showing the operation of this embodiment, FIG. 3 is a longitudinal sectional view of a rice milling machine of this embodiment, and FIG. 4 is this embodiment. FIG. 5 is a perspective view showing the resistor of FIG. 5, FIG. 5 is a graph showing the relationship between the ablation pressure and the ablation time, and FIG. 6 is a graph showing patterns of each set value of the abduction load and overload set values. DESCRIPTION OF SYMBOLS 1 ... Rice-polishing machine main body, 3 ... Hosei roll, 6 ... Main motor, 13 ... Resistor, 16 ... Sub motor (resistor drive device), 26 ... Microcomputer

Claims (1)

[Claims] 1. A detecting means for detecting a load current of a main motor for driving a lumber roll and a value of a load current detected by the detecting means and a predetermined reference value corresponding to an overload current are compared. In the overload control device of the rice polishing machine having a comparison means and a resistance drive device for driving the resistance in the pressure chamber according to the comparison result, the main motor is driven for a predetermined time for the sake of polishing, and the comparison means According to the judgment, the main motor control means for stopping the drive of the main motor when the overload state of the main motor continues for a certain time or more, and the resistor driven by the resistor drive device in conjunction with the stop of the main motor are And a resistor drive device control means for retracting the resistance motor to a position where the resistance to the load is minimized. In the case of stopping the main motor,
It has a storage means for storing the elapsed polishing time even while the main motor is stopped, outputs this elapsed time to the display means and displays it, and when the driving of the main motor is started again, the constant polishing time An overload control device for a rice polishing machine, which drives a main motor for the remaining time.