JPH0823538B2 - Grain supply attitude determination device in moisture meter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a moisture meter for measuring the moisture content value of grains being dried one by one in a grain dryer or the like.

(Prior Art) Conventionally, as this type of moisture meter, a sample grain is crushed between a pair of roll electrodes, and the electrical resistance value generated between the electrodes is converted into a moisture value to automatically determine the moisture value. What to measure is known. The grain supply posture between the roll electrodes is vertical as shown in FIG. 7 (A), which is the normal posture.

(Problems to be solved by the invention) However, the grain supply attitude is often shown in FIG. 7 (B).
As shown in, the person may be in an abnormal posture such as sideways. Further, as shown in FIGS. 7 (C) and (D), a plurality of grains of two or more grains may be continuously or simultaneously supplied by the roll electrodes 1 and 1 for some reason.

However, in the conventional device, the roll electrode 1 as described above,
Since the grain supply attitude in 1 is not known, there is a problem in that the processing of the measured moisture value at that time is not performed properly, and thus the calculation accuracy of the average moisture value becomes low.

Therefore, in order to solve the above problems, it is an object of the present invention to know the grain supply attitude and appropriately process the measured moisture value at that time.

(Means for Solving Problems) In order to achieve the above object, the present invention is configured as follows.

That is, the present invention crushes a sample grain between a pair of roll electrodes 1 and 1 and converts the electric resistance between both roll electrodes 1 and 1 at that time into a voltage based on a moisture signal voltage to obtain a moisture value of the grain. In the moisture meter A for measuring the pressure, a pressure sensor 6 for detecting a pressure between the roll electrodes 1 and 1 when the grain is crushed, and a grain crushed between the roll electrodes 1 and 1 are measured. Measuring time detecting means B for detecting the measuring time required for measuring, measuring time comparing means C for comparing the length of the measuring time with standard time, and comparing moisture value for comparing the magnitude of the measured moisture value with the standard moisture value A means D, a pressure value comparison means E for comparing the magnitude of the pressure value detected by the pressure sensor with a standard pressure value, and a supply attitude determination means F for making a grain supply attitude determination based on each of these comparison results, It is equipped with.

(Operation) The operation of the present invention will be described with reference to FIG.

Now, when the sample grain is crushed between the pair of roll electrodes 1, 1, the moisture meter A measures the moisture value, the measurement time detection means B detects the moisture measurement time, and the pressure sensor 6 crushes between both roll electrodes. The pressure is detected respectively.

Next, these respective values are compared by the respective comparison means C, D, E. Then, based on the respective comparison results, the supply attitude determination means F determines the supply attitude of grain.

Therefore, in the present invention, in addition to the measured moisture value of the moisture meter A, the grain supply attitude at that time is also known, so that the above-described processing of the measured moisture value is appropriate, and thus the accuracy of calculating the average moisture value is significantly improved. To do.

(Embodiment) FIG. 2 is a block diagram of an embodiment of the present invention. To the roll electrode 1 shown in the figure, grains collected during drying are supplied from the inside of the grain dryer one by one at predetermined time intervals. The grain thus supplied is crushed by the roll electrode 1, and the resistance value between the roll electrodes 1 and 1 at that time is converted into a moisture signal voltage by the resistance / voltage conversion circuit 2.

The A / D conversion circuit 3 A / D converts the moisture signal voltage output from the resistance / voltage conversion circuit 2 and supplies the moisture signal voltage to the microcomputer 4.

The measurement time calculation circuit 5 determines the time from the rise to the fall of the moisture signal voltage output from the resistance / voltage conversion circuit 2,
That is, the time during which the grain is crushed and measured between the roll electrodes 1 and 1 is calculated. The output signal of the pressure sensor 6 described later may be used for the calculation of the measurement time.

The pressure sensor 6 detects the pressure between the roll electrodes 1 and 1 when the grain is crushed between the roll electrodes 1 and 1, and supplies the detection signal to the A / D converter 7.

The microcomputer 4 performs a predetermined process according to a predetermined procedure as shown in FIG. 3, for example. Further, the microcomputer 4 has a read only memory (ROM) for storing the above procedure, a random access memory (RAM) for storing various data, and the like. The roll drive motor 8 is a motor for driving the roll electrodes 1, 1.

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

Now, when the moisture measurement of the grain is started, the roll electrodes 1 and 1 start to rotate by the driving of the roll drive motor, and the grain is supplied between the roll electrodes 1 and 1.

As a result, the resistance / voltage conversion circuit 2 outputs a moisture signal voltage corresponding to grain moisture as shown in FIG. 4, which is A / D-converted by the A / D converter 3 and the microcomputer 4
Read in. The moisture signal voltage is calculated by the measurement time calculation circuit 5 as the moisture measurement time t1 from the rising edge to the falling edge, and this time is read into the microcomputer 4 (step S1).

Further, when the pressure sensor 6 detects the pressure between both electrodes when the grain is crushed between the roll electrodes 1 and 1, a pressure signal voltage as shown in FIG. 5 is output, which is the A / D converter 7 Is A / D-converted and read by the microcomputer 4 (step S1).

Next, the respective data read in step S1 in this way are subjected to the respective processings shown in FIG. 3, and based on the processing results, the grain supply attitude and the time as shown in FIG. The grain discrimination result of is also output (see FIG. 3).

Therefore, first, in order to determine the grain supply attitude between the roll electrodes 1 and 1, the moisture measurement time is compared with the standard time (step S2).

As a result, when the moisture measurement time is “standard”, grain determination of brown rice or immature rice is performed based on the moisture value of the grain at that time and the pressure value between the roll electrodes (step S
3). This determination is performed by creating a table corresponding to the graph as shown in FIG. 6 and referring to this table.

When it is determined that the rice is brown rice, brown rice is supplied in a vertical orientation which is a normal posture as shown in FIG. 7 (A), and the fact that the water content is measured is output (step S4). On the other hand, when it is determined that the immature rice is the immature rice, the fact that the immature rice is similarly supplied in the vertical direction and the water content is measured is output (step S5).

By the way, in step S2, for example, FIG.
When it is determined that the moisture measurement time is “shorter” than the standard time at t1 as shown in, the magnitude of the moisture content of the grain and the magnitude of the pressure value between the roll electrodes 1 and 1 at that time are respectively standardized. Compare with the value (steps S6 ~ S
8).

That is, for example, in the case where the moisture signal voltage is as shown in FIG. 4 (a) and the pressure signal voltage at that time is as shown in FIG. 5 (a), the moisture value is within the allowable range determined by the upper limit and the lower limit. If the pressure value at that time is within the allowable range defined by the upper and lower limits (steps S6, S
7) The brown rice is supplied in a lateral orientation, which is an abnormal posture as shown in FIG. 7B, and the fact that the water content is measured is output (step S10).

On the other hand, for example, even if the value of the moisture signal voltage is within the allowable range as shown in FIG. 4 (a), if the value of the pressure signal voltage at that time is below the lower limit as shown in FIG. 5 (b) ( In steps S6 to S8), the fact that the immature rice has been laterally crushed as shown in FIG. 7B to measure the water content is output (step S10).

Further, in step S2, for example, as shown in FIG. 4B, when it is determined that the moisture measurement time is “longer” than the standard time at t2, then the moisture value of the grain at that time and the roll electrode 1, The magnitude of the pressure value during 1 is compared with the standard value (steps S11 to S13).

That is, for example, in the case where the moisture signal voltage is as shown in FIG. 4 (b) and the pressure signal voltage at that time is as shown in FIG. 5 (c), the moisture value is within the allowable range determined by the upper and lower limits. If the pressure value at that time is within the allowable range defined by the upper limit and the lower limit (steps S11, S1
2), brown rice is continuously supplied vertically as shown in FIG. 7 (C), and the fact that the water content is measured is output (step S1).
Four).

On the other hand, for example, even if the value of the moisture signal voltage is within the allowable range as shown in FIG. 4 (b), if the value of the pressure signal voltage at that time is equal to or higher than the upper limit as shown in FIG. 5 (d). (Steps S11 to S13), brown rice is simultaneously supplied vertically as shown in FIG. 7 (D), and the fact that the water content is measured is output (step S15).

By the above-mentioned processing, the supply attitude of the grain at that time and the quality of the grain of the grain can be known in addition to the measured moisture value, so that it is appropriate to take the moisture value as data for calculating the average moisture. Become.

(Effects of the Invention) As described above, in the present invention, it is possible to know the feeding posture of grains between the roll electrodes together with the measured moisture value at that time, and therefore the measured moisture value is appropriately processed. Therefore, the accuracy of calculating the average moisture value can be significantly improved.

[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 an operation example thereof, FIG. 4 is a diagram showing an example of a moisture signal voltage, and FIG. The figure which shows an example of a pressure signal voltage, FIG. 6 is a figure which shows the relationship between a moisture value and a pressure value. FIG. 7 is a diagram showing a crushed state of grain between roll electrodes. 1 is a roll electrode, 6 is a pressure sensor, A is a moisture meter, B is a measuring time detecting means, C is a measuring time comparing means, D is a moisture value comparing means, E is a pressure value comparing means, and F is a supply attitude determining means. .

Claims (1)

[Claims] 1. A moisture meter for crushing a sample grain between a pair of roll electrodes and measuring the moisture value of the grain based on a moisture signal voltage obtained by converting the electric resistance between both roll electrodes at that time into a voltage. A pressure sensor for detecting the pressure between both electrodes when the grains are crushed between the roll electrodes, a measurement time detecting means for detecting a measurement time required for crushing and measuring the grains between the roll electrodes, and the measurement time Measuring time comparing means for comparing the length of the with the standard time, moisture value comparing means for comparing the magnitude of the measured moisture value with the standard moisture value, the magnitude of the pressure value detected by the pressure sensor as the standard pressure value A grain supply attitude determination device comprising: a pressure value comparison means for comparison; and a supply attitude determination means for determining a grain supply attitude based on each of these comparison results.