JPH0253104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a circulating rice mill.

This type of rice milling machine has conventionally installed a resistor that can be freely inserted and removed in the circulation circuit that communicates with the exit side of the grain feeding roll chamber, and by changing the length of the resistor's protrusion, the pressure of brown rice in the milling chamber can be adjusted. However, the pressure inside the milling chamber changes depending on the degree of drying of the brown rice to be milled and the progress of milling, resulting in an excess or deficiency in the pressure suitable for the brown rice to be milled. If the pressure is too high, it will cause broken rice, and if it is too low, the efficiency of rice milling will be reduced. Therefore, in order to solve this problem, we developed a pressure sensor that detects the pressure applied to the grain, a conversion circuit that converts the detection output of this pressure sensor into voltage, and an output voltage from this conversion means and a reference voltage for setting the milling power. a comparison circuit that compares the
A rice milling machine has been developed that includes a drive circuit that drives a drive source connected to a resistor using the output of the comparison circuit, and operates the resistor in accordance with the detection output of the pressure sensor. (Refer to Japanese Patent Application Laid-open No. 57-21942.) However, with this rice milling machine, the resistor is automatically controlled when the predetermined polishing power is set at the start of rice milling. There is no means provided to indicate whether or not the spermatin power is normal.

Therefore, the operator becomes anxious because he or she does not know whether or not the rice milling work is being performed with the set polishing power.

Further, even if the resistor does not operate normally due to a failure of the drive source, drive circuit, etc., and therefore the set cleaning power is not reached, those skilled in the art often do not notice the accident.

The purpose of the present invention is to always maintain the pressure of brown rice at an optimal level in the milling chamber depending on the degree of dryness or type of brown rice, and to prevent the generation of broken rice during milling.
Alternatively, the purpose is to prevent the whitening efficiency from decreasing.

Another purpose is to make it possible to visually confirm whether or not rice is being polished at the set polishing power, and to easily discover failures in the resistance device.

This invention will be described with reference to the embodiments shown in the accompanying drawings. The lower part of a tank 1 of a so-called circulating rice milling machine is communicated with the entrances and exits 2a and 2b of a grain feeding roll chamber 2, and a grain feeding roll 3 is connected to the grain feeding roll chamber 2. The belt 4 and main motor 5
A circulation circuit 7 is formed between the outlet 2a of the grain feeding roll chamber 2 and the tank 1, and a resistor 6 is provided in the circulation circuit 7 to be moved in and out by an auxiliary motor 9. As shown in FIG. 3, a current detector 12 for detecting the load current is connected to the main motor 5, and the auxiliary motor 9 and the current detector 1
This is a rice milling machine that electrically connects the two.

Grains such as paddy and brown rice in tank 1 are sent to grain feed roll 3.
Due to the rotation of the arrows A1, A2, A3,
It is forced to circulate in the direction of A4, A5 and A6. At this time, the rice is polished by the friction between the grain feeding roll 3 and the grains, and the resistor 6 provided in the circulation circuit 7
acts as a cyclic load on the grain, and its protruding length l
The rice polishing power changes depending on the size of the rice.

This resistor 6 is connected in a casing 11 outside the circulation circuit 7 via a coupling 8 to an auxiliary motor 9 for driving the resistor 6. The coupling ring 8 has an internal thread 8a on the auxiliary motor 9 side and an external thread 8b on the resistor 6 side, and by driving the auxiliary motor 9, the internal thread 8a is rotated, and the stopper 10 is rotated. The resistor 6, which is thus prevented from rotating, is moved in and out in its length direction.

The aforementioned main motor 5 and auxiliary motor 9 are connected by an electric circuit as shown in FIG.

That is, an output current value detector 12 is connected to the main motor 5 to detect the load current and convert it into a voltage value.

Further, the output current value detector 12 includes a lighting drive circuit 13 that classifies or encodes the voltage outputted by the detector according to its magnitude using a voltage comparator having a plurality of reference voltages. It is connected.

Connected to the lighting drive circuit 13 is an electric display device 14 that lights one or more lights in response to a signal sent from the circuit 13.

Further, the electric display device 14 is connected to a discriminating device 16 that checks the lighting position and number of lights, and classifies or encodes the load status of the main motor 5 into light load, appropriate load, high load, etc., and outputs the result.

Furthermore, a changeover switch 15 is connected to the lighting drive circuit 13 to switch the state to be determined by the determination device 16.
sets the correspondence between the lighting position or number of lights on the display device 14 and the load status output of the main motor 5, and sets the amount of resistance to grain flow to "weak" for high moisture rice, "standard" for standard rice, In the case of low-moisture rice, the setting can be changed to "strong" depending on the quality of the brown rice, and the nameplate 15a of the switch 15 is shown in FIG.

Between the discrimination device 16 and the auxiliary motor 9,
An auxiliary motor 9 receives a signal from the discrimination device 16 and operates the auxiliary motor 9 to move the resistor 6 in and out in the longitudinal direction of the front and back, and to perform operations such as normal rotation, reverse rotation, and stopping.
A drive circuit 17 is intervened in the connection.

The aforementioned electronic display device 14 has seven rectangular light emitting diodes 14a to 14g arranged as shown in FIG.
Numbers "1", "2", "3" sequentially from the left end, respectively.
They are displayed as "4", "5", "6", and "7".

The changeover switch 15 in FIG. 4 is the indicator 1.
5a indicates the standard position, and the optimum current value of the main motor 5 at that time is set so that it will be when the four light emitting diodes 14a to 14d from No. 1 to No. 4 are lit. After a while after starting rice milling, the current value of the main motor 5 starts to decrease.

At this time, when the No. 4 diode 14d, which had been lit until now, goes out, the discrimination device 16 generates a signal to rotate the auxiliary motor 9 in the normal direction, activates the auxiliary motor drive circuit 17, and causes the auxiliary motor 9 to rotate in the normal direction. , the protrusion length l of the resistor 6 is increased, and the current value of the rice polishing motor is increased.

As a result, when the No. 4 diode 14d lights up again, the discrimination device 16 stops the signal generation of the auxiliary motor 9.

Then, the drive circuit 17 of the auxiliary motor 9 is turned off, the rotation of the auxiliary motor 9 is stopped, the protruding length l of the resistor 6 remains constant, and the current value of the main motor 5 is stabilized within an appropriate range.

Also, even in the case where the No. 3 and No. 4 diodes 14c and 14d go out, the same operation as in the case where the No. 4 diode 14d mentioned above goes out,
When diodes No. 1 to No. 4 light up, the resistor 6 is stabilized within an appropriate range.

Note that the number and position of lights on the electronic display device 14 are determined according to the polishing power, so the worker visually confirms whether the rice milling work is being performed with the set polishing power. be able to.

Further, if the resistor does not operate normally due to a failure in the drive circuit or the like, the prescribed lighting state will not be reached no matter how long it takes, so it is possible to discover a failure in the resistor device just by looking at this lighting state.

Suppose that, contrary to the case described so far, an overload is applied to the main motor 5, its current value increases, and diodes 14e, 14f, and 14g of numbers 5 and above light up.
The discrimination device 16 generates a signal to reverse the auxiliary motor 9, and the auxiliary motor 9 starts reversing due to the current from the auxiliary motor drive circuit 17, the protruding length l of the resistor 6 decreases, and the load on the main motor decreases. and the current value decreases.

As a result, diode 1 of number 5 and above was lit.
When 4e, 14f, and 14g go out, the discriminator 1
6 stops the reverse rotation signal, and the auxiliary motor drive circuit 17
is turned OFF, the rotation of the auxiliary motor 9 is stopped, the protruding length l of the resistor 6 becomes constant, and the current value of the main motor 5 is stabilized within an appropriate range.

When the changeover switch 15 in Fig. 4 is set to the weak (high moisture rice) position on the left, the first diode 1
When the three diodes 14a, 14b, and 14c from No. 4a to No. 3 diode 14c light up, the main motor 5 is operated at a constant current value, and the average current value at this time is the same as when the switch 15 is in the standard position. Since it is lower, the amount of resistance against grains is lower,
The occurrence of broken rice, etc. can be prevented.

When the changeover switch 15 is switched to the strong (low moisture rice) position shown on the right side of Fig. 4, the main motor is switched on at a constant current value when the five diodes 14a to 14e, numbered 1 to 5, are lit. 5 is operated, the average current value becomes high, the resistance of the resistor 6 increases, and the efficiency can be improved for milling hard rice such as brown rice.

Since this invention is as described above, by operating the changeover switch 15, rice polishing is always automatically adjusted at an appropriate pressure depending on the hardness of brown rice due to differences in dryness, etc. Therefore, efficient rice milling can be carried out without causing broken rice due to too high pressure or deterioration of capacity due to too low pressure.

Further, the following effects can be mentioned as effects of the present invention. That is, the output voltage of the current detector is classified or coded by the lighting drive circuit according to its magnitude, and the corresponding lamp of the electronic display device is turned on.

Therefore, the operator can visually confirm the suitability of the rice polishing power during the rice milling operation and feel at ease. or,
If the lighting does not stay as set for a long time, it means that the drive circuit, etc. has failed and the resistor is not working properly. Therefore, the operator can detect a malfunction in the drive circuit, etc. by simply looking at the lighting status of the electronic display device. can be easily discovered.

Furthermore, the lighting drive circuit classifies or encodes the output voltage of the current detector using a voltage comparator with multiple reference voltages depending on the magnitude of the voltage, and outputs the resultant output. When the light turns on, the discrimination device also operates.

Therefore, since one lighting drive circuit can operate two devices, it is possible to reduce the cost of the device.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part, FIG. 3 is an electrical block diagram, and FIG. 4 is an enlarged front view of a portion of FIG. 1. 1...Tank, 2...Grain feeding roll room, 2a...
Exit, 2b...Inlet, 3... Grain feeding roll, 5...
Main motor, 6...Resistor, 7...Circulation path, 9...
Auxiliary motor, 12... current detector.

Claims (1)

[Claims] 1. A resistor that is taken in and out of the circulation circuit by the auxiliary motor, a current detector for detecting the load current of the main motor that drives the grain feeding roll, and an output voltage of the current detector that detects the output voltage depending on the magnitude of the voltage. A lighting drive circuit that uses a voltage comparator having a plurality of reference voltages to classify or encode the resulting output, an electric display device that lights one or more lights according to an output signal of the lighting drive circuit, and a display device that a discriminating device that examines the lighting position and number of lighting lights and classifies or encodes the load state of the main motor into light load, proper load, and high load and outputs the result;
A rice polishing machine comprising: a switch for switching the discrimination target state of the discriminator and connected to the output side of the lighting drive circuit; and a drive circuit that drives the auxiliary motor by an output signal of the discriminator.