JPH0731125B2 - Light intensity adjuster for the removal rate sensor in the huller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a hulling machine, and more particularly to an improvement in light amount adjustment of a loss rate sensor provided for detecting a loss rate.

(Prior Art) Conventionally, as a hulling machine, when a grain sample that has been de-treated by roll-rolling is supplied to a de-rate sensor composed of a light-emitting element and a light-receiving element one by one, the output signal of the de-rate sensor outputs the grain. Alternatively, it is determined whether or not it is brown rice, and a removal rate detection unit that obtains a removal rate from the determination result, a grain supply amount adjustment unit that adjusts the amount of grain to be supplied to the derolling roll, and a roll that performs a gap adjustment of the derolling roll. A device having a gap adjusting means is known.

In this type of removal rate sensor, the detection accuracy of the removal rate decreases if the light emission amount of the light emitting element is too large or too small.Therefore, adjust the light amount so that the light emission amount of the light emitting element becomes an optimum value. Is going.

(Problems to be solved by the invention) However, when the derolling is opened during the adjustment of the light intensity or the grain supply amount to the derolling is increased to change the desorption rate, the appropriate light intensity adjustment is required. There is a possibility that it cannot be done, and this point has not been taken into consideration in the past.

In view of these points, an object of the present invention is to avoid the fluctuation of the light removal rate during the light amount adjustment for stabilization, and thus to optimize the light amount adjustment.

(Means for Solving the Problem) In order to achieve such an object, the present invention has the following configuration.

That is, according to the present invention, when a grain sample that has been subjected to derolling by derolling is supplied one by one to a rate sensor composed of a light emitting element and a light receiving element, it is determined from the output signal of the rate sensor whether it is paddy or brown rice. Then, the paddy having a loss rate detecting means for obtaining a loss rate from the determination result, a grain supply amount adjusting means for adjusting the amount of grains to be supplied to the derolling roll, and a roll gap adjusting means for performing a gap adjustment of the derolling. In the sliding machine, the light emission amount of the light emitting element is sequentially changed, each time the change rate sensor measures a plurality of samples, a measurement distribution is created from each of the measured values, and the maximum frequency is obtained. Light amount adjusting means for stopping the light amount adjustment of the light emitting element when the frequency is within a set range, and each adjustment of the grain supply amount adjusting means and the roll gap adjusting means while the light amount adjusting means is adjusting the light amount. Movement And a control means for stopping, is made comprising a.

(Operation) In the present invention configured as described above, the control unit stops each adjusting operation of the grain supply amount adjusting unit and the roll gap adjusting unit while the light amount adjusting unit adjusts the light amount.

Therefore, since the grain supply amount to the derolling and the opening degree of the derolling are both constant and the variation of the derolling rate is avoided, the light amount adjustment becomes appropriate.

(Embodiment) FIG. 1 is a block diagram of an embodiment of the present invention.

In the figure, 1 is a transmission type desorption rate sensor, which irradiates light from a light emitting element (not shown) toward a grain sample that has been de-treated by a derolling roll 2 and supplied one by one, and the transmitted light Is received by a light receiving element (not shown), and an electric signal corresponding to the received light amount is output.

A light emitting diode is used as a light emitting element that constitutes the removal rate sensor 1, and a phototransistor is used as a light receiving element.

Reference numeral 4 denotes a microcomputer, which performs a control process as shown in FIG. 2 and has a memory for storing various data.

Reference numeral 5 denotes a D / A conversion circuit, which receives a light amount adjustment signal from the microcomputer 4 and performs D / A conversion to supply it to the light emitting element of the defect rate sensor 1. Reference numeral 6 denotes an A / D conversion circuit, which receives the output signal from the loss rate sensor 1 and performs A / D conversion to supply it to the microcomputer 4.

The derolling roll 2 is driven by a derolling drive motor 7, and the gap between the rolls is adjusted by a forward / reverse operation of a roll gap adjusting motor 8.

Reference numeral 9 denotes a shutter (opening / closing valve) provided at the bottom of a grain hopper (not shown). When the shutter 9 is opened, the grain in the grain hopper falls on the derolling roll 2 to be deprocessed.

Next, an example of the control processing of the embodiment of the present invention configured as described above will be described with reference to the flowchart of FIG.

First, the clearance initial setting of the derolling 2 is performed (step
S1), when the roll gap adjusting motor 8 is driven to set the roll gap to the set value, the roll gap adjusting motor 8 stops driving.

Next, when the shutter 9 of the grain hopper is opened by a predetermined amount (step S2), the grain in the grain hopper is supplied to the derolling roll 2, so that the grain is derolled.

Then, the light amount adjustment as described below (step S3)
However, since the opening degree of the derolling roller 2 and the opening degree of the shutter 9 are maintained at the initial settings during the adjustment of the light amount, the removal rate becomes substantially constant.

In the light amount adjustment, the light emission amount of the light emitting element of the escape rate sensor 1 is gradually increased by a light intensity adjustment signal from the computer 4, and the escape rate sensor 1 is changed every time the emission amount changes.
A plurality of samples detreated by the derolling 2 are measured. Next, the measurement distributions A to C as shown in FIG. 3 are created from the respective measured values to obtain the maximum frequency, and whether or not the maximum number is within the optimum setting range x for detecting the withdrawal rate is determined. Determine.

When the maximum frequency reaches the setting range x as shown by the measurement distribution C in FIG. 3 by such processing, the light amount adjustment is ended. At this time, the light emission amount of the light emitting element of the removal rate sensor 1 is in the optimum state.

When the light amount adjustment is completed, a discrimination voltage for discriminating between paddy and brown rice is calculated from the measurement value of the removal rate sensor 1 (step S4), and the removal rate control is performed (step S5).

In the removal rate control, the removal rate is detected from the measured value of the removal rate sensor 1, and the roll gap adjusting motor 8 is rotated in the forward / reverse direction so that the detected removal rate matches the set value preset by the removal rate setting device. Then, the gap of the derolling roll 2 is opened and closed.

As described above, in the embodiment of the present invention, while the light amount is being adjusted, the opening amounts of the derolling roller 2 and the shutter 9 are kept in the initial settings, so that the measurement distribution of the desorption rate sensor is shown in FIG. As in A), the light amount adjustment becomes appropriate.
The removal rate in FIG. 4 (A) is about 80%.

By the way, when the derolling roll 2 or the shutter 9 is opened during the light amount adjustment, the measurement distribution of the stripping rate sensor 1 becomes the fourth distribution.
As shown in FIG. 6B, the light amount adjustment becomes extremely inappropriate. The removal rate in Fig. 4 (B) is about 50%.

(Effect of the invention) As described above, in the present invention, during the adjustment of the light amount, the fluctuation of the removal rate does not occur, so that the light amount adjustment can be optimized
Therefore, the detection accuracy of the escape rate is improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flow chart showing an example of its control processing, and FIGS. 3 and 4 are diagrams showing an example of a measurement distribution of a removal rate sensor. 1 ... Desorption rate sensor, 2 ... Derolling, 4 ... Microcomputer, 8 ... Roll gap adjusting motor, 9 ... Shutter.

Claims (1)

[Claims] 1. When a grain sample, which has been subjected to derolling by derolling, is supplied to a desorption rate sensor comprising a light emitting element and a light receiving element one by one, it is discriminated from the output signal of the desorption rate sensor whether it is paddy or brown rice. A paddy hull having a loss rate detecting means for obtaining a loss rate from the determination result, a grain supply amount adjusting means for adjusting the grain amount supplied to the derolling roll, and a roll gap adjusting means for performing a gap adjustment of the derolling process. In the machine, the light emission amount of the light emitting element is sequentially changed, and each time the change is made, the loss rate sensor measures a plurality of samples, the measurement distribution is created from each of the measured values, and the maximum frequency is obtained. Light amount adjusting means for stopping the light amount adjustment of the light emitting element when is within a set range, while the light amount adjusting means is adjusting the light amount, each adjusting operation of the grain supply amount adjusting means and the roll gap adjusting means. Stop Light amount adjuster de ratio sensor and control means, consisting comprise of