JPS5916547A - Dehulling rate control device for hulling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rice huller that feeds rice into the gap between two rolls and removes the grain.

If the ratio of unhulled rice to the amount of paddy fed to the rolls, that is, the unhulling rate, is low, the work efficiency of the huller will be poor.
On the other hand, if it is too high, broken rice will result, so when operating the huller, it is necessary to keep the dehulling rate at an appropriate constant value.

For this reason, in the past, the load current of the main motor that rotates the rolls was kept constant, or as the outer periphery of the rolls wore out, the two roll shafts were moved closer together to keep the gap between the rolls constant. However, this alone was not enough to keep the withdrawal rate constant.

As a result of searching for the cause, we found that the de-hulling rate of the huller depends not only on the motor's load current and the roll gap, but also on the roll diameter, the difficulty of de-hulling depending on the type and moisture content of the paddy, and the difference between the rolls and rolls caused by the main motor. It was found that the power consumption ratio with the drive unit and the frequency of the power supply voltage vary depending on the button.

Therefore, when these conditions that determine the stripping rate are held constant, the relationship between the sliding amount W from the roll and the load current of the main motor is calculated, and the relationship is shown in a graph using the stripping rate Q as a parameter. It becomes a constant curve as shown in the figure.

From the graph in Figure 1, for example, if we set the stripping rate Q = 85% and the sliding amount W = Wi (Kg), then the load current A multiplied by AmAi (ampere) is determined, so the actual load current 1 current is If the roll gap S (mm) is adjusted so that the measured value Am becomes Am = At, S = 0.9.
It is clear that when (mm ), Am = Ai, and then the desexualization rate Q becomes Q = 85%.

Based on this knowledge, the present invention first sets the frame removal rate Q (%) and the sliding amount W (Kg), calculates the value of the load current A that should flow to the main motor at that time, and calculates the value of the load current A that should flow to the main motor at that time. The objective is to control the unframed ratio Q to a constant value by adjusting the gap S between the rolls so that Ai and the measured value Am of the load current actually flowing are equal.

To explain the embodiment of the present invention shown in the drawings, 1 is a hopper of a rice huller, and a feed roll 3 and a regulating valve 4 are provided facing each other in a paddy supply port 2 at the bottom of the hopper. Parallel hulling rolls 5 and 6 are placed horizontally across a gap S. Then, the shaft 5a of one roll 5 is supported by a net clamp, and the shaft 6a of the other roll 6 can be rotated left and right around the skin 7. iii It is supported by the rod 8.

Then, the screw portion lo is connected to the motor M, which rotates in the forward direction and in the reverse direction, via the reduction gear 9, and the screw portion at the tip thereof is passed through the adjustment rod 8.

11 is a shutter that opens and closes the paddy supply port 2;

Then, a main motor (not shown) rotates the rolls 5 and 6 in opposite directions, and the paddy is supplied from the hopper 1 to the gap S between the rolls 5 and 6, and the paddy is removed by friction between the two rolls.

However, in the present invention, the condition specifying circuit 12, the desexing rate specifying circuit 13, and the sliding amount detecting circuit 14 are each connected to the load current reference value calculation circuit 15, and the output side of the circuit 15 is connected to the load current detecting circuit 16 as well as the comparing circuit. 17, and further connect the output side of the circuit 17 to the motor M.

Then, the condition specifying circuit 12 determines the diameter of the rice rolls 5 and 6, the ease of de-scaling depending on the type of paddy and moisture content, and the parts driven by the main motor other than the rolls (for example, the feed roll 3) and the roll 5.
．． The power consumption ratio with 6 and the frequency of the power supply voltage are each specified manually or by a sensor and input into the arithmetic circuit 15.

Further, the detection circuit 14 detects the sliding amount from the inclination angle of the regulating valve 4 or the rotational speed of the feed roll 3, and inputs it to the arithmetic circuit 15 together with the de-shaping rate Q specified in the de-shaping rate designation circuit 13. .

Then, the calculation circuit 15 calculates the reference value Ai of the load current flowing in the main motor circuit of the rolls 5 and 6 under the conditions based on the values of the circuits 12, 13 and 14, and
i and the measured value Am of the load current actually flowing in the comparator circuit 17. As a result, if the measured value Am is larger than the reference value Ai, the motor M is rotated forward and the screw portion IO is
By turning the adjusting rod 8 to the right via the control rod 8, the gap S is enlarged. Conversely, if the measured value An1 is smaller than the reference value At, the motor M is reversely rotated to reduce the gap S.

[Measurement of Load Current] The roll load may be measured from the torque from the iC main motor to the rolls 5 and 6 or the torque between the left and right rolls 5 and 6.

Next, the example of the circuit shown in FIG. 4 in which the present invention is implemented will be explained.

First, resistors R2 and R3 are connected in series to variable resistor R1, and resistor R2 is connected to the series circuit of resistors R4 and R5 and variable resistor R.
Connect 6 in parallel.

And the sliding terminal a of the resistor R6 is connected to the amplifier AI.

is connected to the positive input terminal of comparator C1 and the negative input terminal of comparator C2, the sliding terminal of resistor R4 is connected to the negative input terminal of comparator C1, and the terminal C between resistors R4 and R5 is connected to the negative input terminal of comparator C1. Each is connected to the positive input terminal of comparator C2.

R7 is a variable resistor connected to the feedback circuit of amplifier A1.

18 is a coil of a current transformer connected to the power supply circuit of the main motor, and a diode 19. It is connected to the amplifier rlJ device A2 via a rectifier circuit of capacitor 20. R8 is a variable resistor connected to the feedback circuit of amplifier A2.

The output sides of amplifiers A1 and A2 are connected to the negative and positive input terminals of comparator C3, respectively, and a variable resistor R9 and a resistor RIO are connected to ground the output side of amplifier A1.
The intermediate terminal d and the output side of the amplifier A2 are connected to the positive and negative input terminals of the comparator C4, respectively.

Then, the output sides of comparators C'l and C2 are connected to NOR circuit 2.
1 to the NOT circuit 22, and the NOT circuit 23 of the output @11 of the comparator C3 and the circuit 22 to the NOR circuit 24.
Further, the NOT circuit 25 and the circuit 22 on the output side of the comparator C4 are connected to the NOR circuit 26, respectively.

T1 is a switching transistor of a relay R1 that rotates the motor M in the normal direction, and the output side of the NOR circuit 24 is connected to its base.

T2 is a switching transistor of a relay R2 that reverses the motor M, and the output side of the NOR circuit 26 is connected to its base.

The output sides of the circuits 22, 24 and 26 are connected to a NOR circuit 27.
and its output side is connected to the base of transistor T3.

Light emitting diodes Di are connected in parallel to relays R1 and R2, respectively.
, D2 are also connected to the collector side of the transistor T3, respectively, to a light emitting diode D3.

The emitters of transistors TI, T2 and T3 are grounded via a changeover switch S1 which switches between an automatic e-contact and a manual f-contact, and the other changeover contact of switch S1 connects the transistors T1 and T2 through a changeover switch f32.
Connect to the collector of

Then, the variable resistor R1 is adjusted to specify the frequency of the power supply voltage and the power consumption ratio between the drive parts other than the rolls and the rolls, and the variable resistor R is used to specify the upper limit opening of the regulating valve 4. By interlocking R6 with the regulating valve 4, the amount of sliding is specified. Next, by variable resistor R7,
Specify the diameter of the paddy, the type of paddy, and the demixing rate Q.

As a result, the amplifier A1 outputs the reference value Ai of the load current, and by adjusting the variable resistor R9, the allowable lower limit of fluctuation of the reference value Ai is output from the terminal d.

On the other hand, the amplifier A2 outputs the load current value Am measured by the current transformer 18.

Here, the comparators C1 to C4 output 1 when the positive input is large, and output 0 when the negative Ill input is large, so if the measured value Am of the load current A is larger than the reference value Ai, then The output of comparator C3 is 1 and the output of comparator C4 is 0.

Similarly, when the output of the terminal 9 is smaller than the terminal S and larger than the terminal C, that is, when the regulating valve 4 is within the appropriate opening range, the outputs of the comparators CI and C2 both become 0.

Therefore, in this case, the output of the NOR circuit 21 is 1 and the output of the NOT circuit 22 is 0, so when the output of the comparator C3 is 1 and the output of the NOT circuit 23 is 00, the output of the NOR circuit 24 is 1. Turn on. This closes the relay R1 and causes the motor M to rotate forward to enlarge the gap S between the rolls, and also lights up the light emitting diode D1 to indicate that the gap S is too narrow.

On the other hand, if the measured value Am is smaller than the allowable lower limit of fluctuation of the reference value Ai, the output of the comparator C3 becomes O and the comparator C4 outputs 1, so the output of the knot circuit 25 becomes O. ,
Circuit 26 outputs a 1, turning on transistor T2.

This causes the relay R2 to close and reverse the motor M to reduce the gap S between the rolls, and also lights up the light emitting diode D2 to indicate that the gap S is too wide.

As a result of adjusting the gap S in this way, if the measured value Am of the load current A is within the permissible variation range of the reference value Ai, then the clamp Am is smaller than Ai and larger than the output of terminal d. In this case, the outputs of comparators C3 and C4 are both 1 and the NOR circuit 27
All inputs become 0. Therefore, at this time, the circuit 27 outputs 1 to turn on the transistor T3, which causes the light emitting diode D3 to light up, indicating that the gap S is "normal".

In short, in the present invention, the dehulling rate Q and the circuit that specifies the conditions such as the diameter of the roll that determines the dehulling rate Q, the degree of difficulty of dehulling the paddy, and the power consumption ratio of the rolls, and the detection circuit 14 for the amount of scraping of the paddy is connected to the arithmetic circuit 15 to calculate the reference value Ai of the load current of the main motor that drives the rolls 5 and 6, and the output side of the arithmetic circuit 15 is connected to the output side of the load current A detection circuit 16 as well as the comparison circuit. Since the motor M is connected to the motor M through the motor M and the motor M is rotated in the forward direction or in the reverse direction so that the measured value Am matches the reference value At, a constant desexing rate can be maintained at all times.

[Brief explanation of drawings]

Figure 1 shows the relationship between the amount of paddy being removed from the rolls W (Kg) and the main motor load current (ampere), and the dehulling rate Qc%.
) as a parameter. FIG. 2 is a longitudinal cross-sectional view of a main part of a rice huller embodying the present invention, FIG. 3 is a block diagram of the apparatus of the present invention, and FIG. 4 is an electric circuit diagram thereof. Agent Tetsube Maki (and 2 others) Fig. 1 Tsukimi-kari rate Q ('10) Fig. 2

Claims (1)

[Claims] In a rice hulling machine that adjusts the gap between two rolls by moving the shaft position of the rolls by a motor M that can freely rotate in the forward and reverse directions,
A circuit that specifies the unhulling rate Q and conditions such as the diameter of the roll that determines the unhulling rate, the difficulty level of unhulling the paddy, and the power consumption ratio of the rolls, and a circuit that detects the amount W of paddy being removed are connected to the calculation circuit. The reference value Ai of the load current of the main motor that drives the roll is calculated, and the output side of this arithmetic circuit is connected to the output side of the detection circuit that outputs the measured value Am of the load current via a comparison circuit. A frame removal rate control device that is connected to a motor MK and rotates the motor M in the normal or reverse direction so that the measured value Am matches the reference value Ai.