JPH0731123B2 - Removal rate detector for hulling machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a removal rate detection device which is provided in a hulling machine and which checks the removal rate of mixed rice that has been subjected to derolling by derolling.

(Prior Art) Conventionally, as a device of this type, light is applied to each grain of the mixed rice that has been detreated by derolling, and an electrical output corresponding to the amount of transmitted light or the amount of reflected light is obtained from a sensor. In addition to doing so, the electrical output is compared with the paddy / brown rice discrimination value set in advance to discriminate between paddy and brown rice,
It is known to count the numbers of paddy and brown rice from the results of the comparison to obtain the loss rate.

Then, the paddy / brown rice discrimination value is, for example, 1 for every 100 grains.
The sensor detects about 400 particles as a unit, selects the maximum value and the minimum value from the detection values for each unit, and determines the maximum value and the minimum value at predetermined time intervals.

(Problems to be solved by the invention) Therefore, in the past, the discriminant value of paddy / brown rice may fluctuate, and the discriminant value of paddy / brown rice obtained last time may be significantly different from that obtained this time. However, in this case, the removal rate also greatly changes following it, so there is a problem that the removal rate control for adjusting the interval of the derolling based on the detected removal rate becomes extremely unstable.

Therefore, in view of these points, the present invention provides the
If the brown rice discriminant value changes significantly from that of the previous time, the aim is to prevent the rate of dehulling control based on the hull / brown rice discriminant value and to stabilize the rate of dehulling control. To do.

(Means for Solving Problems) In order to achieve this object, the present invention has the following configuration.

That is, the present invention irradiates each grain of the mixed rice after derolling with derolling with light, and outputs the electric signal according to the reflection amount or the transmission amount of the light, and the removal rate detecting sensor 2, A paddy / brown rice discriminant value calculating means A for obtaining a discriminant value for discriminating between paddy and brown rice from a detection value of the sensor 2 at every predetermined timing, a discriminant value storage means B for storing the discriminant value thus obtained, and the sensor 2 Of each of the detection values obtained by the rice loss / brown rice discriminant value calculation means A and the rice loss rate detection means C that compares the detected values of No. 1 and the discriminant value stored in the storage means B and detects the weight loss rate from the comparison result. A discriminant value discriminating means D for discriminating whether or not the discriminant value fluctuates by a predetermined value or more from the previous discriminant value stored in the storage means B, and as a result, the present discriminant value is larger than the previous discriminant value. Is also fluctuating by a certain value or more, the loss rate detection means C Comprising a de-rate detection stop means E to stop detecting the rate.

(Operation) The mixed rice of the unhulled rice and brown rice that has been detreated by the derolling of the huller is introduced to the sensor 2 for detecting the deficiency rate one by one,
The released state is converted into an electric signal.

The paddy / brown rice discriminant value calculation means A, at every predetermined timing,
A discriminant value for discriminating between paddy and brown rice is obtained based on each detected value of the sensor 2, and the discriminant value thus obtained is stored in the discriminant value storage means B.

The escape rate detecting means C stores each detected value of the sensor 2 in the storing means B.
Is compared with the discriminant value stored in, and the escape rate is detected from the comparison result.

The discriminant value discriminating unit D discriminates whether or not the discriminant value obtained by the paddy / brown rice discriminant value calculating unit A this time has changed by a predetermined value or more from the previous discriminant value stored in the storage unit B.

As a result of the comparison, when the discriminant value obtained this time is fluctuated by a predetermined value or more from the previous discriminant value, the escape rate detection stopping means E stops the escape rate detecting means C from detecting the escape rate.

Therefore, since the escape rate detecting means C does not detect the escape rate,
The removal rate does not fluctuate abruptly, and instability of the removal rate control can be avoided.

(Embodiment) FIG. 2 is a block diagram of a hulling machine to which an embodiment of the present invention is applied, and the drawing shows only a portion relating to the present invention.

In the figure, reference numeral 1 is a one-chip type microcomputer, which comprises a central processing unit (CPU), a random access memory (RAM), and a read only memory (ROM). The RAM stores various data, and the ROM stores a control procedure for controlling each component as shown in FIG. 3, for example.

2 is a sensor for detecting the removal rate, which applies light to each grain of the mixed rice of unhulled rice and brown rice after the derolling by the derolling machine of the hulling machine, and outputs an electric signal according to the reflection amount or the transmission amount of the light. The paddy and brown rice are discriminated by the magnitude of the electric signal as described later. The output of the sensor 2 for detecting the removal rate is supplied to the microcomputer 1 through the input interface 3.

Reference numeral 4 denotes a withdrawal rate setting dial for setting a withdrawal rate serving as a reference in the withdrawal rate control. TR1 and TR2 are transistors that are connected to the buffer 5 and drive the motor that adjusts the derolling gap. For example, when the relay 6 connected to the transistor TR1 is excited, the motor rotates in the forward direction and the derolling closes. When the relay 7 connected to TR2 is excited, the motor reverses and the derolling is opened.

Next, an operation example of the embodiment of the present invention configured as described above will be described with reference to FIGS. 3 and 4.

When dehulling of paddy is started by derolling of a huller, the deblended mixed rice of unhulled rice and brown rice is guided one by one to a sensor 2 for removal rate detection, and depending on the removal state. An electrical signal is obtained, which is the microcomputer 1
, And such a process is performed for 400 grains, for example.

Then, 100 grains of the 400 grains are set as one unit, the maximum value is selected from the detected values in each unit, and the average of the selected maximum values is calculated to be a paddy voltage, for example.
At the same time, the minimum value is selected from the detected values in the respective units, and the average of the selected minimum values is obtained, for example, as the brown rice voltage (step S3). Then, a discriminant value for discriminating between paddy and brown rice is obtained from these both voltages by a predetermined arithmetic expression (step S1), and the discriminant value is stored (step S2).

Next, the escape rate is calculated as follows based on the discriminant value thus obtained (step S3). That is, each detection value of the sensor 2 for detecting the removal rate is compared with the discriminant value obtained as described above, and when the detected value exceeds the discriminant value, it is counted as paddy, while the detected value is, for example, the discriminant value. When it is less than, the rice is counted as brown rice, and the removal rate is calculated from each of these count values.

Then, the derolling opening / closing motor rotates in the normal or reverse direction so that the delaminating ratio calculated in this way matches the delaminating ratio set by the delaminating ratio setting dial 4, thereby adjusting the derolling gap (steps S4 to S4). S7).

Next, at the predetermined timing for newly calculating the discriminant value, the discriminant value is newly calculated by the same procedure as step S1 described above (steps S8 and S9).

Then, it is determined whether or not the discriminant value calculated this time is within an allowable area d having a certain width above and below the discriminant value V obtained last time, as shown in FIG. 4 (step S10). As a result of the discrimination, when the discriminant value calculated this time is in the allowable area d, the contents of the previous discriminant value stored at present are rewritten to the discriminant value calculated this time (step S11).

On the other hand, when the discriminant value calculated this time is not in the allowable region d and is significantly different from the previous discriminant value, the discriminant value is calculated again.

When the discriminant value calculated this time is significantly different from the discriminant value calculated last time, the discriminant value is not immediately calculated as described above, but the stored content of the discriminant value is left as it is, and the loss rate is detected. Derolling may be controlled.

(Effects of the Invention) As described above, in the present invention, the discriminant value of paddy / brown rice obtained this time is compared with the discriminant value of paddy / brown rice obtained last time, and the discriminant value of this time fluctuates by a certain amount or more than the discriminant value of the previous time. Since the detection of the escape rate is prohibited and the escape rate control is not performed while the escape rate is controlled, instability of the escape rate control due to a sudden change in the detected escape rate can be eliminated.

[Brief description of drawings]

FIG. 1 is a functional diagram of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a flow chart showing its control example, and FIG. 4 is a graph showing an output waveform example of a sensor for detecting a loss rate. is there. Reference numeral 2 is a sensor for detecting a loss rate, A is a paddy / brown rice discriminant value calculating means, B is a discriminant value storage means, C is a stall rate detecting means, D is a discriminant value determining means, and E is a stall rate detection canceling means.

Claims (1)

[Claims] 1. A sensor for detecting a removal rate, which emits an electric signal according to the reflection amount or the transmission amount of the light, by irradiating each grain of the mixed rice after the derolling process with derolling, and the sensor The paddy / brown rice discriminant value calculating means for obtaining the discriminant value for discriminating between paddy and brown rice from the detected values at predetermined timings, the discriminant value storage means for storing the discriminant value thus obtained, and the respective detected values of the sensor described above. Compared with the discriminant value stored in the storage means, the loss rate detection means for detecting the loss rate from the comparison result, and the current discriminant value obtained by the paddy / brown rice discriminant value calculation means,
A discriminant value discriminating unit that discriminates whether or not the discriminant value stored in the storage unit has changed by a predetermined value or more, and as a result, the discriminant value this time has changed by a constant value or more from the previous discriminant value. The removal rate detection device for the huller comprises the removal rate detection stopping means for stopping the removal rate detection means from detecting the removal rate.