JPH0778470B2 - 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 unhulled rice and brown rice from the results of the comparison to obtain the removal rate.

Then, the paddy / brown rice discrimination value is, for example, 1 for every 100 grains.
Around 400 particles were detected by the sensor as a unit, and the maximum value and the minimum value were selected from among the detected values for each unit, and they were calculated at relatively short time intervals based on these maximum and minimum values. .

(Problems to be solved by the invention) As described above, conventionally, since the paddy / brown rice discrimination value was updated in a relatively short time, the detected desorption rate was changed more than necessary and was not constant. For example, it may cause a disorder and cause a problem that the controlled object such as derolling is not properly controlled.

Therefore, in view of the above points, the present invention aims to stabilize the detected desorption rate by updating the paddy / brown rice discrimination value only when necessary, and thus appropriately controls the controlled object such as derolling. The purpose is 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 unhulled rice and brown rice from a detected value of the sensor 2, and comparing each detected value of the sensor 2 with the obtained discriminant value,
Loss rate detecting means B for detecting the loss rate from the comparison result
And an operating condition detecting means C which detects whether or not the operating conditions of the huller have changed, and outputs a detection signal when the change is detected, and when the detection signal is output, It comprises discriminant value update command means D for instructing to start the brown rice discriminant value calculation means and update the discriminant value.

(Operation) Now, when the derolling of the hulling machine starts the detreatment,
The demixed mixed rice of unhulled rice and brown rice is guided to the deflation rate detection sensor 2 one by one, and the deflated state is converted into an electric signal.

The paddy / brown rice discriminant value calculation means A obtains a discriminant value for discriminating between paddy and brown rice based on each detection value of the sensor 2. The escape rate detecting means B compares each detection value of the sensor 2 with its discriminant value and detects the escape rate from the comparison result.

Then, when the operating condition detecting means C detects that the operating condition has changed such that the set removal rate is reset during the operation of the huller, a detection signal is output.

When the discriminant value update command means D that has received this detection signal issues a command to update the discriminant value, the paddy / brown rice discriminant value calculating means A is activated by this command and updates the discriminant value.

In this way, the discriminant value is updated only when necessary, so
The detection desorption rate can be stabilized.

(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. Reference numeral 5 denotes a rotary selection tube rotation setting dial for setting the number of rotations of a rotary selection tube for selecting paddy and brown rice from the mixed rice after detreatment.

TR1 and TR2 are transistors that are connected to the buffer 6 and that control the motor that adjusts the derolling gap. For example, when the relay 7 connected to the transistor TR1 is excited, the motor rotates in the forward direction and the derolling closes. When the relay 8 connected to TR2 is excited, the motor rotates in reverse so that the derolling opens.

TR3 and TR4 are transistors that are connected to the buffer 6 and control the motor that adjusts the rotation of the rotation selection cylinder. For example, when the relay 9 connected to the transistor TR3 is excited, the motor becomes faster and the rotation selection cylinder becomes faster. When the operation is started and the relay 10 connected to the transistor TR4 is excited, the motor becomes low speed and the rotation selection cylinder becomes low speed operation.

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

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, among 400 grains, 100 grains are set as one unit, the maximum value is selected from 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 calculated to be the brown rice voltage, for example. Then, a discriminant value for discriminating between paddy and brown rice is obtained from these both voltages by a predetermined arithmetic expression (step S1).

Next, the escape rate is calculated as follows based on the discriminant value thus obtained (step S2). 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 removal rate set by the removal rate setting dial 4 is read (step S3), and the removal roll opening / closing motor is normally or reversely rotated so that the removal rate detected in step S2 matches the set removal rate. Adjust the clearance for derolling (steps S4 to S7).

Next, it is detected whether the escape rate is reset by the escape rate setting dial 4 (step S8), and whether the number of rotations is reset by the rotation selection tube rotation setting dial 5 (step S8). Step S9). When none of them is reset, the above-described removal rate control is performed without updating the once determined determination value.

On the other hand, when both or either one of them is reset, the process returns to step S1, the discriminant value is updated by the procedure as described above, and the withdrawal rate control is performed by the updated discriminant value.

As described above, in the present embodiment, the discriminant value is updated when the removal rate or the rotation selection cylinder rotation speed is reset, but further, the rotation selection cylinder is reduced and again subjected to the derolling process. The discriminant value may be updated according to the amount of the reduced paddy.

(Effects of the Invention) As described above, in the present invention, the paddy / brown rice discrimination value once determined only when necessary, such as when the operating condition is changed by resetting the set removal rate during the operation of the huller. Therefore, the detected desorption rate can be stabilized, and the controlled object such as derolling can be controlled appropriately.

[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, and FIG. 3 is a flowchart showing its control example. Reference numeral 2 is a sensor for detecting the removal rate, A is a paddy / brown rice discrimination value calculating means, B is a removal rate detecting means, C is an operating condition detecting means, and D is a determination value update commanding 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 Rice paddy / brown rice discriminant value calculating means for obtaining a discriminant value for discriminating between paddy rice and brown rice from the detected value, and comparing each detected value of the sensor with the obtained discriminant value, and detecting the escape rate from the comparison result. A detecting means, an operating condition detecting means for detecting whether or not the operating conditions of the huller have changed, and outputting a detection signal when the change is detected; A dehulling rate detection device for a hulling machine, which comprises discriminant value update command means for activating brown rice discriminant value calculation means and instructing to update the discriminant value.