JPS5995941A - Apparatus for automatically controlling roll gap of 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 an automatic roll gap control device for obtaining grained rice with a desired two-culm ratio in a rice huller.

In this type of control, the load current reference value of the culling roll drive motor that gives the desired 1]i2'c・￥ rate is set in advance, and the load current of the culling roll drive motor is adjusted to the set reference value. The gap between the dehulling rolls is controlled so that the dehulling rolls are approximately the same.As previously mentioned in 3HH, there is an empirical rule that if the load current of the deculling roll drive motor is constant, the dehulling rate of 18 dropped rice will be approximately constant. It exists.

By the way, the number of paddy supplied to the rice to be sorted +11: ]-le is 1'(
Since the load current has a variable configuration, equal IB2 rod rate control cannot be achieved by simply setting a constant value as the load current reference value. That is, Jli! 111-D-The load on the small drive motor is the first
As shown in the figure, J: The sea urchin fluctuates. Figure 1 shows an example of a uniform coating rate curve, where the horizontal axis shows the amount of paddy supplied to the culling roll, and the vertical axis shows the load current of the scale roll drive motor. As is clear from the above, in order to maintain a uniform dehulling rate, the load current reference value of the dehulling roll drive motor must be increased as the feed rate ω for the dehulling roll increases. Must be.

From this point of view, the applicant has proposed various roll gap automatic controls that follow the 1152 culm rate curve.

By the way, the driving current of the l19 rod roll drive motor differs between the beginning of the hulling operation and the time after a certain period of time has passed since the start of the hulling operation, and according to actual measurements, it decreases by about 0.2 (A).

As is clear from the measured data shown in FIG. 2, this is thought to be largely due to a decrease in current due to heat generation and temperature problems in the motor itself.

Figure 2 shows the process of starting operation of the frame-removing l]-le drive motor.
This graph shows the correlation between the motor drive current and the motor's heat generation temperature, where the horizontal axis is the elapsed time (minutes) since startup;
The vertical axis shows the drive current (A) of the I]f2 culm roll drive motor when it is running in an empty state and the temperature (°C) of the outer shell of the motor. As is clear from the figure, the motor drive current decreases as the motor outer shell temperature increases, and stabilizes when the heat generation temperature reaches a substantially constant value. The elapsed time at this time is about 15 minutes.

Does such a reduction in motor drive current have an adverse effect on the automatic control of the roll gap according to the equal deframe rate curve? In other words, even though the load current of the scale roll drive motor decreases due to the above-mentioned reason, the load current base t maintains a constant Dii culm curvature curve.
Since the rice value is left in a high state, the gap between the rolls is too narrow for the amount of coated rice to be supplied, which not only makes the dehulling rate too high, but also causes early wear of damaged rice and IJ+X culm rolls. Zuru d3 There is that.

The present invention has been made based on this point of view, and its purpose is to reduce the temperature of the motor during the hulling operation of the dehulling roll drive motor (11). An object of the present invention is to provide an automatic roll gap control device that does not increase the drop-off rate (Y rate) of dropped rice.

The features of the present invention to achieve this object are as follows: II. 2 culm 1"-load current detection means for small drive motor; and culm removal 1]-
The load current reference value of the le drive moke! -3λ reference value setting means, and roll gap control means for controlling the gap between the culling rolls so that the detected load current value of the detection means substantially matches the load current reference value of the setting means. In the roll gap automatic control system of the machine, at the beginning of the hulling operation of the 1152 scale roll drive motor, the load current base 4I-value is adjusted to decrease according to the decrease in the drive current that occurs as the temperature of the motor increases. The present invention provides an automatic roll gap control device for a rice huller, in which a reference value compensating circuit for lowering the reference value is inserted between the reference value setting means and the roll gap control means.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a schematic diagram of a rice hulling machine related to the present invention, and reference numbers in the figure indicate a hulling section, and -2- indicates a swinging sorting section. The hulling section 1 is equipped with a supply hopper 3 and a frame removing station 4 that communicates with the hopper, and a shutter 3a that allows the hopper outlet 1 to be opened and closed is interposed in the communication section between the two. Below the shutter 3a, a control valve 5a and a feed roll 5 are connected to the inlet of the S2 culms 4.
1) is to control the amount of paddy fed into the pair of deculling rolls (6a, 6b) in the 1152 weighing scale by the opening degree of the valve. It is mechanically related to the vertical movement of the M-movement hopper.The culm removal roll consists of a main roll 6a and an auxiliary roll 6b, which are rotated by a roll drive motor M1 with a predetermined circumferential speed difference.

A roll gap d is provided between the rolls, and the roll gap d is adjusted by moving the sub roll 6b in the left-right direction in the drawing by the roll gap adjustment mechanism 7. The roll gap adjustment mechanism 7 includes a motor M2 for adjusting the roll gap and a manual handle 7a, and can adjust the roll gap electrically or manually. 1 drive sorting section 2 includes a floating hopper 8 and a swinging sorting plate 9, and the floating hopper 8
Internal storage i1 of rice to be sorted in a suspended state by the plowing body 10
In response, -C-1x is lowered. The vertical movement of the hopper 8 is related to the control valve 5a of the rice hulling section 1, and gives a small degree of hearing when the rice is stored, and a large degree of hearing when the amount stored is small. The oscillating sorting plate 9 is oscillated by a oscillating mechanism (not shown) in diagonal left and right directions, up and down directions in the drawing, and sorts rice by gravity from the floating hopper 8. d3. The dashed-dotted line in the figure indicates the flow of grains.

FIG. 4 is a block diagram showing an embodiment of an automatic roll gap control device according to the present invention.

In the figure, reference number 20 is the frame removing roll drive motor M1.
30 is a reference value setting means for outputting a load current reference value of the frame removal roll drive motor M1 in accordance with the approximation characteristic obtained by linearly approximating the above-mentioned equal nlJ R' rate curve; 4
0 is the amount by which the load current reference value decreases (according to actual measurements as mentioned above, 0 .2 (A) A reference value compensation circuit for lowering (A) culmness); This is a roll gap driving means for controlling the gap between the frame rolls.

The load detecting means 20 has a load detecting sensor 201 such as a curlen lance, and an amplifying and smoothing circuit 202, and outputs the load of the frame removing roll drive motor at a DC level. The reference value setting means 30 includes a valve opening sensor 301 that senses the valve opening of the control valve 5a, a pattern circuit 302 that approximates an approximation characteristic obtained by approximating an equal unframed rate curve with two straight lines, and an approximation of the pattern circuit. It also has a reference value setting circuit 303 that can set up a de-framing rate curve that approximates a desired de-framing rate based on the characteristics. The roll gap control means 50 controls the load current reference value given through the compensation circuit 40 to control the roll drive motor M1.
A comparator circuit 501 that provides an output according to an increase or decrease in the detected load current, and an output circuit (502a, 502b) that drives the forward or reverse rotation relay (R1, R2) of the roll gap adjustment motor M2 according to the output of the circuit 501. have

FIG. 5 is an example of the reference value setting means 30 and the reference value compensation circuit 40, and FIG. 6 is an explanatory diagram of the relationship between the output of the reference value setting means 30 and the output of the MQ value compensation circuit 40.

The curve (a) shown in FIG. 6 is the iso-I)2 ratio curve explained in FIG. 7 rate curve (a) with two straight lines (V+ = aX+ +, "!/2 = bx+ 2
) according to the approximate equitheoretical weighing rate curve (b) approximated by 11)
2. Give the load current reference value according to the amount of paddy in the culm. In the Fuken value setting circuit 30, the valve opening sensor 301 is a potentiometer that outputs the valve opening of the control valve in voltage level, and the pattern circuit 302 is connected to the above y, =ax+, and:! /2=
E) Two straight lines of 2 to X+, for example, 1 with an unframed rate of 85%.
]j2 It has an approximation characteristic that approximates the form of the culm rate curve. In the pattern circuit 302, the first straight line yI = a
The slope a of the second straight line V2 = bx+ is determined by R3/R'l, and the slope a of the second straight line V2 = bx+ is determined by R3/R1//R2. Therefore, circuit characteristics along two straight lines having different slopes can be obtained depending on whether the diode DI is turned on or off. Then, the diode "D1 has a negative power supply (-
Since V) is given, the on timing is determined by R2 and R4, and the weighing rate curve (a) is approximated. Moreover, as is well known, diodes do not change into a conductive state even if they are forward biased;
There is a dead region of about 0.6 V, and the current level only increases slightly, and then increases in a parabolic manner. Therefore, when the diode D1 turns on, that is, when its characteristics change from the first straight line to the second straight line, it forms a gentle curve as shown by the broken line in FIG. 6 before and after. This approximate characteristic is 30
The output of 2b is given as In addition, 302a and 30
2b is an inverting amplifier. The approximation characteristic shown in 302b approximates the equal 1j≦1 culm rate curve as a pattern, but since k, and therefore 2, have not yet been determined, it is not specified. kl is determined according to the 1"-le drive motor determined according to the width of the roll, and if kl is determined, it will naturally be 1 (2 h).The adjustment setting for 1 is 1". The adjustment of 1 dog 5 is clear from Figure 5. 302 Convert the level of the output horn of 1. Reference 1 [1! Stage setting path 303 is a variable resistor VR with variable amplification factor. The amplifier 303a has an amplifier 303a, which adjusts the output of the pattern circuit 302 by the peak width "vR-c" and calculates the set load current base I ((Approximate characteristic to which the value belongs, ICC standard value depending on the valve opening degree, To set the load current reference value using d3 and VR, set the desired release control manually as described below.
l+! Means 2 for detecting the load current of the Yj roll drive motor
This is done by detecting at 0 and adjusting VR until the output of the setting circuit 303 almost matches the detected load current.

The reference value compensation circuit 40 subtracts, for example, 0.2 A of the decrease in the drive current that occurs as the motor heats up after the debonding roll drive motor starts operating, from the load current reference according to the detection of the heat generation temperature of the motor. The load current reference value is outputted according to the approximate equality weighing rate curve (c) shown by the dashed line in FIG.

The temperature sensor 4.01 of the reference value compensation circuit 40 is provided to detect the temperature of the outer surface of the frame removing roll drive motor M1 (as shown in FIG. is supplied to the comparator 403 at a voltage level. ] The comparator 403 uses the divided voltage J across the resistors R6 and R7 as a reference level, and provides an output of A when the heat generation temperature of one motor exceeds the level. According to the measured data, the reference level is set to around 1°C. Comparator 7! The output of lO3 drives one transistor. 1 to transistor Tr serve to lower the load current reference value by 0.2 (A) according to the above example, and in the off state of Tr, the partial voltage value of the resistors Rho and R9 is set to the output of the reference value setting means 30. In addition to the standard value, in the on state of l-r, the partial pressure values of R+o and R9//R8 are added to the output reference value of the reference value setting means 30. Therefore, resistance R+o
Ml value setting means 3 with the minute and positive value from R9 added.
Since a load current reference value of 0 is determined (this reference value belongs to the approximate curve (b) in Figure 6), if the transistor Tr is turned on and connected in parallel to resistor R8 or R9, the load current will change. The standard value will decrease like a water pattern (see Figure 6).

In FIG. 5, reference numeral 501 indicates a specific example of a comparison circuit of the roll gap control means, which has comparators 501a and 5011 (as shown) and compares the detected load current with respect to the load current reference value. The window converter 1~ provides an output corresponding to an increase/decrease in the detected load current.

The automatic control of the roll gap in the above (76 formations) is performed in accordance with the near-zero culling rate curve to which the reference value belongs after setting the load current reference value of the reference value setting means 30. is 1'' - the self Ω of the gap] control is it'
It is carried out in a state where there is no ll. In other words, (11) the roll gap is adjusted by manual operation of the manual handle 7a of the wheel gap adjustment mechanism 7 and the desired j1;2 weighing rate is obtained through actual hulling. Adjust the variable resistor VR of the reference value setting circuit 303 so that the output of the reference 111°1 setting means 30 almost matches the detected load current (output of the load current detection means 20) of the DB floating scale middle roll drive motor M1. It is carried out by Whether or not the load current reference level 1 has been set can be easily recognized by, for example, monitoring the output of the comparator circuit 501.

After the load reference value has been set in this way, automatic control of the roll gap is started. At the beginning of automatic control, 1ljJ
Since the light and heat temperature u of the culm drive motor M1 is still low, the reference value compensation circuit 40 is not driven.Approximation 1 as shown in FIG.
]) 2 Outputs the load current reference value according to the curvature curve (b). When the heat generation temperature of the motor M1 increases by -C over time and its drive current decreases and reaches a stable value, the decrease in the drive current of the -C motor M1 due to the operation of the reference value compensation circuit 40 is The current value corresponding to 'l'l is subtracted from the load current reference value to output the load reference value corresponding to the approximate equal unframed rate curve according to (c) of FIG. As a result, motor M1
By absorbing the drop in the driving current, the gap is maintained at a gap that corresponds to the desired deframing rate, and an increase in the deframing rate of rice that has slipped can be prevented. .

FIG. 7 shows the reference value compensation circuit/1. Another specific example of O C゛,
Its feature is that it drives the timer circuit 40B on the condition that the shutter interposed between the supply hopper and the empty frame is opened and the presence of paddy inside the supply hopper, and after that time-up, the load is activated as in the previous specific example. Current factor 4 (to lower the value by the amount of the drop in driving current of M1).
The reference number 404 is a grain sensor that turns on when detecting paddy being pulled inside the supply hopper 3 as shown in FIG. , 406 is a 1-repower circuit that outputs a pulse when the grain sensor 404 is turned on and the shutter amount detection sensor 4.05 is turned off, and 407 is a T-flip-flop that inverts the output with the 1-return force of the circuit 406. , 408 is a timer circuit that inverts the output of the flip-flop 407 and turns on the 1-1 resistor 1-1 at the time of 15 minutes according to the actual measurement data.Other inputs 5 Components with the same reference numerals as those in the figure indicate the same components. According to this configuration, after the shutter 3a is opened and the paddy IFi operation has started, the heat generation temperature of the motor M1 is changed.
The transistor Tr enters the A state after the elapse of time corresponding to the drive current decreasing and stabilizing at the second rise, and the transistor Tr enters the A state (see Fig. 6).
The load current reference value will be lowered accordingly.

Note that although the reference value setting means d3 has been specifically explained in the embodiment described above, it is of course applicable to other various base γW110 setting means.

As explained above, according to the present invention, the load current reference value is set according to the drop in drive current that occurs as a result of heat generation during the process of starting operation of the frame-removing roll drive motor. [Since we have added a reference value compensation circuit to lower the current level, it is possible to prevent the dropping rate of rice from falling over 47% despite the decrease in the drive current of the IS1 roll drive motor. It is possible to provide an automatic roll gap control device that can reduce the premature wear of the 111i V"70 roll without damage.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the rate curve; Fig. 2 is an explanatory diagram of the correlation between the drive current of the de-frame roll drive motor and the temperature of the motor over time; A schematic diagram of a related rice hulling machine, Fig. 4 is a roll gap automatic 1l according to the present invention.
A diagram showing an embodiment of the i11 device, FIG.
A specific example of the value compensation circuit, FIG. 6 is an explanatory diagram of the relationship between the output of the reference value setting means and the base illt complement circuit, and FIG. 7 is another specific example of the reference value compensation circuit. 20...Load current detection means 30...Basic 4-value setting means 40...Reference value compensation circuit 50...Roll gap control means patent Licensed by Iseki Agricultural Machinery Co., Ltd. = 2'-

Claims (2)

[Claims] (1) IIi 2-hill roll drive motor load current detection means, culling roll drive motor load current standard value setting means for providing a load current reference value, and the detected load 7R current value of the detection means is 1.
) A3 C1 C1 culling rolls are installed in a roll gap automatic control device of a rice hulling machine having a roll gap control means for controlling the gap between the 11 rolls. In the process of starting sliding work on the drive motor, the load current reference value is reduced by the amount of the drop in the drive current due to the rise in temperature of the motor. (++j An automatic roll gap control tan device for a rice huller, characterized in that it is inserted between a setting means and a roll gap control means. (2) The reference value compensation circuit has a temperature sensor that detects the heat generation temperature of the culm roll drive motor, and upon detection of a predetermined temperature of the sensor, the load current reference value is adjusted to the load current of the culm roll drive motor. An automatic roll gap control device for a rice huller as claimed in claim 1, which is configured to lower the gap by the amount of the decrease. (:3) The reference value compensation circuit has a counter that measures a predetermined time i (from the start of paddy supply) and measures the load current reference value Ili at the time-up of the counter. The first claim is that the load current of the roll drive motor is reduced by the amount of the load current.
Automatic roll gap control device for rice huller.