JPS5936553A - Duhulling ration control system of dehuller - 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 automatic control of the dehulling rate in a rice huller.

In this type of automatic control, a load reference value for the scale-removal roll drive motor that provides a desired shedding rate is set in advance, and the gap between the scale-removal rolls is adjusted so that the load on the de-culm roll drive motor approximately matches the reference value. By controlling , equal culling rate control is performed.

However, since the amount of rice supplied to the dehulling rolls is configured to fluctuate depending on the amount stored in the floating hopper that supplies the rice to be sorted to the sorting plate, it is difficult to control the deweighing rate evenly by simply setting a constant load reference value. It cannot be done. That is, the load on the dehulling roll drive motor changes as shown in FIG. 1 in order to keep the dehulling rate approximately constant despite changes in the amount of paddy relative to the dehulling roll. Figure 1 shows an example of the equal deweighing rate curve (A), where the horizontal axis is the valve opening of the control valve that controls the amount of paddy supplied to the deweighing roll, and the vertical axis is the opening of the deweighing roll drive motor. It's a load. As is clear from the figure, in order to maintain a uniform shedding rate, the load reference value of the n+a culm roll drive motor must be increased as the valve opening increases, that is, the amount of feed to the shedding roll increases. Therefore, the present applicant proposed to approximate the uniform densification rate curve (a) using two straight lines, the horizontal line a and the slope line a, and to give the quasi-value of the load M based on this approximation characteristic.

The present invention further develops automatic dehulling rate control based on such a uniform dehulling rate curve, and has the following objectives: 1; The object of the present invention is to provide a method for controlling the rate of equal removal.

A feature of the present invention to achieve this object is that the dehulling rate is approximately constant regardless of the opening degree of the control valve that controls the culm to be dehulled. In a system that automatically controls the debonding rate based on the amount of load fluctuation with respect to the valve opening overnight, the constant debonding rate curves representing the relationship between the valve opening and the load fluctuation have different slopes. The joint part is approximated by two straight lines curved, a reference value is given according to the valve/opening degree based on the approximate stripping rate curve, and the load of the stripping roll drive motor approximately matches the reference value. The present invention is an automatic dehulling rate control system for a rice huller in which the gap between the dehulling rolls is controlled so as to control the dehulling rate at the same rate regardless of the valve opening degree. An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic diagram of a hulling machine related to the present invention, and reference number 1 in the figure indicates a hulling section, -? - indicates the oscillating sorting section.

The hulling section 1 has a supply hopper 3 and a deweighing chamber 4 that communicates with the hopper.
A shutter 3a for freely opening and closing the hopper outlet is interposed in the communication portion between the two. Below the shirt 93a, the control valve 5a and the feed roll 51, which are placed at the entrance of the dehusking chamber 4, are supplied to a pair of dehusking rolls (6a', 6b) which are pulled into the deweighing chamber. The amount of paddy to be processed is controlled by the opening degree of the valve.
Mechanically related to the vertical movement of the floating hopper. The deweighing roll consists of a main roll 6a and an auxiliary roll 6b, which are rotated by a roll drive motor (not shown) 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 66 in the left-right direction in the drawing using the roll gap adjustment mechanism 7. The roll gap adjustment mechanism 7 includes a motor and a manual handle for adjusting the roll gap, and can adjust the roll gap electrically or manually. The swinging sorting section 2 includes a swinging hopper 8 and a swinging sorting plate 9, and the swinging hopper 8 has an elastic body 10 with J:
It is placed in a suspended state and moves up and down depending on the internal storage amount of rice to be sorted. The vertical movement of the hopper 8 is related to the control valve 5a of the rice huller 1, and the valve opening is small when the storage is at its maximum, and the valve opening is large when the storage is at the minimum. The oscillating sorting plate 9 is oscillated by a oscillating mechanism (not shown) diagonally from left to right and up and down in the drawing, and gravity-sorts the rice to be sorted from the floating hopper 8. In addition, the dashed-dotted line in FIG. 2 shows the flow of grains.

FIG. 3 is an explanation of the principle of the automatic control system according to the present invention, and the curve (A) in the figure is the same desexualization rate curve obtained experimentally as in FIG. 1. As is clear from the figure, in the present invention, the isostatic rate curve (a) is divided into two straight lines with different slopes (V + = a X + k 1. y2 = a
X + k 2 ), and furthermore, in order to better approximate the curve (a), the connecting portion J of both straight lines is curved as shown by the broken line. This curving is one of the important features of the present invention, and utilizes the inherent properties of diodes as described below.

FIG. 4 shows an embodiment of the control system according to the present invention, and reference numeral 20 in the figure indicates load detection means for the scale removal roll drive motor;
Reference numeral 1 denotes reference load setting means for providing a load reference value according to the approximation characteristics shown in FIG. The load detection means 20 includes a load detection sensor 201 such as a current transformer and an amplification and smoothing circuit 2.
02, and outputs the load of the IB2B2-le drive motor at a DC level. The reference load setting means 21 includes a valve opening sensor 210 that senses the valve opening of the control valve, a pattern circuit 211 having the approximate characteristic shown in FIG. 3, and an approximate characteristic to which the set load reference value belongs based on the output of the pattern circuit. It has a reference value setting circuit 212 that outputs the reference value according to the reference value.

A specific example of the reference load setting means 21 is shown in FIG.

In FIG. 5, the valve opening sensor 210 is a potentiometer that outputs the valve opening of the control valve as a voltage level, and the pattern circuit 211 is the V+ = aX 1/1 and y2 =
The two straight lines b x + k2 are combined in a curved manner, and have approximation characteristics to, for example, an equal desexualization rate curve with a desexualization rate of 85%.

In the pattern circuit 211, the slope a of the first straight line VI=aX0kl is determined by R3/R+, and the slope a of the second straight line y2
The slope of =bX+2 is determined by R3/R1//R2. Therefore, circuit characteristics along two straight lines having different slopes can be obtained depending on whether the dies A-D+ are turned on or off. Since the diode D1 is supplied with a negative power supply (-V), it is clear that the ON timing can be determined by R2 and R4 in accordance with the output voltage of the potentiometer. By the way, as is well known, a diode does not suddenly change into a conductive state even if it is forward biased;
It has a characteristic that there is a certain degree of insensitivity region, and only a very slight increase in the current level is observed, and then the current level increases in a parabolic manner. Therefore, when the diode D1 changes to the on state, i.e. changes its characteristics from the first straight line to the second straight line 'J
In reality, it becomes a gentle curve before and after that. This approximate characteristic is given as the output of 211b. In addition, 2
11a and 211+) are inverting amplifiers. 211h
The approximation characteristic approximates the equal deweighing rate curve as a pattern, but it cannot be specified because 1<1 and 2 have not yet been determined.K+ is determined according to the width of the deweighing roll. It is determined according to the roll drive motor to be used, and if 1 is determined, 2 will naturally be determined. In particular, an adjustment setting of 1 is given by R5, and the adjustment of R5 level converts the output of 211b as seen in FIG.

The reference value setting circuit 212 has an amplifier 212a with a variable amplification factor using a variable resistor VR, and by adjusting the amplifier 212a, the output of the pattern circuit 211 is amplified and the output of the pattern circuit 211 is adjusted according to the valve opening degree with the approximate characteristic to which the load reference value set by the VR belongs. Output the reference value. Note that the load reference value is set by VR by manually setting the roll gap that provides the desired culm ratio as described later, and by detecting the load on the removal roll drive motor at the gap using the load detection means 20. This is done by adjusting VR so that the output of the setting circuit 212 almost matches the detected load.

Returning to FIG. 4, reference numeral 22 is a comparison circuit that outputs an increase/decrease in the motor load with respect to the load reference value.As shown in FIG. ~do. 23a and 23
24a and 24b are forward and reverse rotation relays (R+, R2) for a roll gap adjustment motor (not shown); This is an output circuit that drives the forward rotation and reverse rotation relays (R+, R2) respectively based on the output of the comparison circuit 22. Further, reference number 25 in FIG. 4 is an automation condition circuit, 26 is a deweighing rate OK display circuit,
27 is an automatic/manual switching circuit.

The automation condition circuit 25 outputs an output circuit (24a
, 24b) is turned on and off to provide automatic conditions for the unweighing rate control, and the automatic control of the roll gap when the idle hopper is almost full or empty is canceled and the unweighing roll is damaged and Prevents overload on the roll drive motor. The deweighing rate OK display circuit 26 is the reference load setting means 2.
It displays the setting of the load reference value in step 1, and is activated when the automatic/manual switching circuit 27 is in the manual state, and detects the load detection means 20 that gives the desired weighing rate at the roll gap set by manual operation. The variable resistance V of the reference setting circuit 212 is applied to the load.
When the output of the reference load setting means 21 due to the adjustment of R is substantially matched, this fact is displayed. The automatic/manual switching circuit 27 switches between automatic and manual unloading rate control, and in the automatic state, automatic unloading rate control is performed based on a comparison between each output of the load detection means 20 and the reference load setting means 21, In the manual state, the functions of these automatic control systems are inhibited, allowing manual roll gap control.

The automatic control of the unweighing rate in the above configuration is performed by the automatic/manual switching circuit 2.
After setting the load M standard value in the 70 manual state, the process is performed according to the reference value. The load reference value is set by manually adjusting the gap between the hulling rolls with the automatic/manual switching circuit 27 in the manual state to obtain a roll gap that allows the desired hulling ratio to be obtained through actual hulling. This is done by adjusting the variable resistance VR of the reference value setting means 212 so that the output of the reference load setting means 21 almost matches the detected load (output of the load detection means 20) of the roll drive motor that is being unrolled in the gap. . The setting of the reference value is indicated by the 11;1 lining rate OK display circuit 26.

After the load reference value is set in this way, the switching circuit 2
Automatic control of the deweighing rate is started by switching the automatic state in step 7. That is, the reference load setting means 21 outputs the load reference value in accordance with the approximate characteristic to which the set load reference value belongs based on the approximate characteristic that the pattern circuit 211 has.

Therefore, even if the valve opening changes and the amount of paddy relative to the deweighing roll changes, the reference value according to the valve opening will be output while satisfying the approximation characteristics. The motor for adjusting the roll gap is the output of the load detection means 20 of the stripping roll drive motor.]
The comparison circuit 22 and each output circuit <248 so that the value substantially matches the above reference value.

24b).

As explained above, according to the present invention, the load reference value is determined according to the valve opening through the approximation characteristic of approximating the equal unframed rate curve with two straight lines with different slopes and whose joints are curved. Since the load reference value is given as J:, it is possible to give a good uniform unloading rate characteristic to the load reference value, and it is possible to perform automatic control of a good equal unloading rate regardless of the valve opening degree of the control valve. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the equal dehulling rate curve, Fig. 2 is a schematic diagram of a huller related to the present invention, Fig. 3 is an explanatory diagram of the principle of the present invention, and Fig. 4 is an embodiment of the present invention. , FIG. 5 is a specific example of the reference load setting means shown in FIG. 20...Load detection means 21...Reference load setting means 22...Comparison circuit 24, a, 24. b...Output circuit 210...Valve opening sensor 211...Pattern circuit 212...Reference value setting circuit,

Claims (1)

[Claims] Controlling the amount of paddy to be deculled [1-How much is the opening of the control valve →
In a method of automatically controlling the deweighing rate based on the amount of load variation with respect to the valve opening of the deweighing roll drive motor in which the deweighing rate is approximately constant regardless of the amount of load variation, the relationship between the valve opening and the load variation is Approximate the equal weight removal rate curve represented by two straight lines that have an inclination to each other and whose joining part is curved, give a reference value according to the valve opening degree based on the approximated weighing rate curve, and A rice huller characterized in that the gap between the dehulling rolls is controlled so that the load of the dehulling roll drive motor substantially matches a reference value, thereby controlling the dehulling rate to be constant regardless of the valve opening degree. Automatic control system for machine removal rate.