JPH0259946B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to the improvement of an automatic moisture content measuring device, and in particular, to the improvement of an automatic moisture content measurement device, and in particular to the improvement of an abnormal moisture content measurement value due to green rice, immature rice, etc. contained in grains being dried. This invention relates to an automatic water content measuring device that can be removed.

[Technical Background of the Invention] Conventionally, this type of automatic moisture content measuring device takes out a portion of drying grain as a measurement sample, measures the moisture content, repeats it several times to obtain an average value, and calculates the moisture content. The average value was taken as the moisture content value of the whole grain. However, grains during drying do not necessarily have a uniform moisture content, and especially in paddy, high-moisture immature rice is mixed in, so when such immature rice is taken out as a measurement sample and measured, the moisture content value may be inaccurate. It will increase rapidly. Therefore, using the moisture content measurements of grains actually measured at each time during drying, a regression line is found by the least squares method, or when the measured value exceeds a predetermined reference value, the reference value is input as the measured value. Improved devices have been devised to determine the moisture content of grains using different methods or remeasurement methods.

[Problems with the background art] By the way, in the improved device using the regression line method described above, since the regression line is determined using all the actually measured values, it is strongly influenced by green rice and immature rice, and the regression line is There is a tendency for the moisture content value to shift toward higher values, and the amount of shift also varies depending on the mixing ratio of green rice and immature rice. Therefore, it is difficult to say that the accuracy of the moisture content calculated based on the above regression line is high, and if the operation control when the dryer is stopped is performed based on the moisture content value calculated using the above regression line, the moisture content of the dried grains will be reduced. There was a drawback that the values tended to be over-dry.

[Object of the Invention] Therefore, in order to eliminate the above-mentioned drawbacks, the object of the present invention is to obtain a regression line by excluding abnormal measured values due to green rice, immature rice, etc., and to accurately predict the end time of drying from this regression line. The purpose of this project is to develop an automatic moisture content measuring device that can prevent overdrying of grains and ensure the best drying conditions for paddy at all times.

[Structure of the Invention] In order to achieve this object, the present invention uses an automatic moisture content measurement device that measures the moisture content of grains during drying to create a temporary regression line using the moisture content measurements actually measured to date. The regression line is calculated again by excluding the measured values that are more than a certain value apart from the temporary regression value calculated from the temporary regression line, and the regression line is calculated using the regression line. It is characterized by controlling the operation of

[Embodiments of the Invention] Examples of the present invention will be described in detail and specifically below based on the drawings.

FIG. 1 is a graphical representation of a method for calculating the moisture content of grain during drying at an elapsed time h.

First, a regression calculation is performed using the least squares method or the like using the measured value n at each actual measurement time measured before h to obtain a temporary regression line _l1 .

Next, an allowable regression line that is shifted toward the high moisture side by d from the tentative regression line _l1 is defined as _l2 .

After that, regression calculation is performed again using the measured values excluding the abnormal measured value a on the high moisture side of the allowable regression line _l2 , and the regression line l is obtained.

Then, the point m where the regression line l intersects h is regarded as the moisture content value of the grain during drying at the elapsed time h.

In this case, the measured value from the measurement sample mixed with green rice, immature rice, etc. will be extremely high as shown in a, so by appropriately selecting the value of d, it is possible to eliminate the influence of green rice and immature rice. You can get the rate.

As a result, the moisture content value of the whole dried grain can be accurately known, and the point at which drying ends can be clearly known based on the coincidence with the set stop moisture content Me.

In FIG. 1, the allowable regression line _l2 is set on the high moisture side, but it is not limited to this, and it is also possible to set it on the low moisture side from the temporary regression line _l1 . In this case, it is possible to eliminate the influence of extremely low measured values due to insufficient removal of the measurement sample.

Next, a dryer control system that performs such moisture content calculation will be described.

To explain the control device in Fig. 2,
Reference numeral 2 denotes a sample crushing section, and the sample crushing section 2 crushes and holds grains such as paddy between a pair of upper and lower electrodes 4, 4, and the electricity generated between these electrodes 4, 4 is The resistance value is resistance/voltage conversion circuit 6/A/
The command signal 12 is converted by the D conversion circuit 8 and further passes through the A/D conversion interrupt control circuit 10, and is input to the arithmetic processing unit 14. A reference clock signal for timing from a clock oscillation circuit 16 is input to the arithmetic processing unit 14 as a command signal 20 via a timer interrupt control circuit 18. Using a control signal 24 between the memory (ROM) 22,
Further, predetermined program data is obtained through the address data bus 26 and the ROM data bus 28. 30
For example, a water content setting switch composed of a rotary switch sets and outputs a signal corresponding to the stop water content Me, and this signal is sent to the encoder 3.
The code is converted in 2. 34 is a limit switch that operates to collect a sample and sandwich it between the electrodes 4, 4, and these moisture content settings, each switch operation, and the signal of the actually measured moisture content value are input to the input data buffers 36, 38, 40. Control signal 4 from
2 is input to the arithmetic processing unit 14 via the input data bus 44. 46 is a random access memory (RAM) for data that temporarily stores the calculation results and input data of the processing unit 14, and the output data of the processing unit 14 is transmitted via the output data bus 48 using the control signal 42. Display control circuit 5
0, is input into the numeric display 52 to display the moisture content value. Further, the signal corresponding to the moisture content value of the output data bus 48 is further inputted to the relay driver 56 via the output data buffer 54, thereby
A forward relay 58 for forward rotation of the motor of the sample crushing section 2, a backward relay 60, a relay for stopping the fuel of the dryer heat source 62, and a relay for stopping the blower 64 are operated.

Next, the operation of the present invention will be explained with reference to the flowchart shown in FIG.

First, when the power switch is turned on, the system enters the start state, and all necessary operations are set to the initial state.
Next, the waiting time starts, and measurements are taken immediately with zero at the start, and from the second time onwards, measurements are taken intermittently at predetermined time intervals. The determined moisture content value is stored in the data RAM 46 each time. After that, the stop moisture content Me of the moisture content setting switch 30 is read, and it is determined whether this is the first measurement. If it is the first measurement, the average value of the five measured values is taken as the moisture content value Mn at that time. , from the second time onward, a temporary regression line l ₁ is calculated using all the measured values up to the present time, and the regression calculation is performed again excluding the measured values of (l ₁ +d) or more to obtain the regression line l. and,
Point m at elapsed time h is determined from the regression line l, and this is set as the current moisture content value Mn. Thereafter, Mn is compared with the above-mentioned stop moisture content Me, and if it is smaller, the dryer is immediately stopped, but if it is larger, the drying interval time is set. Then, during the waiting time, the operation of displaying the predicted moisture content predicted by the regression line l is repeated. Next, after this waiting time has passed, the next actual measurement of moisture content, regression calculation, etc. are performed in the same way. As the drying process approaches the end while repeating these operations, the moisture content value obtained from the regression line I gradually converges to the stop moisture content Me, and when the difference between the two disappears, the drying is stopped.

[Effects of the Invention] As is clear from the above detailed explanation, according to the configuration of the present invention, a temporary regression line is obtained using the measured value of the moisture content of grains actually measured during drying, and a temporary regression line is calculated from the temporary regression line. Abnormal measured values due to green rice, immature rice, etc. that differ from the calculated tentative regression value by more than a certain value are excluded and the regression calculation is performed again, completely eliminating the influence of green rice, immature rice, etc. can. Therefore, the grain moisture content value calculated based on the regression line obtained by the recalculation is extremely accurate. As a result, it is possible to accurately predict the end time of drying, and it is possible to reliably prevent grain over-drying that occurs under the influence of green rice, immature rice, etc., and to always guarantee the best drying condition for paddy. Can be done.

Furthermore, during the standby time other than during measurement, the moisture content value calculated from the regression line changes every moment and is displayed, giving the user a sense of security and making it ideal as a link when measuring intermittently. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the automatic moisture content measuring device according to the present invention, in which Fig. 1 is an explanatory diagram of the principle of the invention, Fig. 2 is a circuit diagram of the control system, and Fig. 3 is a schematic diagram of the sample crushing section. , FIG. 4 is a flowchart based on the principles of this invention. In the figure, 2 is the sample crushing part, 4 is the electrode, and 6 is the resistor/
Voltage conversion circuit, 8 is A/D conversion circuit, 10 is A/D conversion circuit,
D conversion interrupt control circuit, 12 is a command signal, 14 is an arithmetic processing unit, 16 is a clock oscillation circuit, 18 is a timer interrupt control circuit, 20 is a command signal, 22 is a read-only memory (ROM), 24 is a control signal ,2
6 is an address data bus, 28 is a ROM data bus, 30 is a water content setting switch, 32 is an encoder, 34 is a limit switch, 36, 38, 40
is an input data buffer, 42 is a control signal, 44 is an input data bus, 46 is a random access memory (RAM), 48 is an output data bus, 50 is a display control circuit, 52 is a numeric display, 54 is an output data buffer, 56 is a relay 58 is a forward relay, 60 is a reverse relay, 62 is a fuel stop relay, and 64 is a blower stop relay.

Claims (1)

[Claims] 1. In an automatic moisture content measurement device that measures the moisture content of grains during drying, a temporary regression line is determined using the moisture content measurements actually measured to date, and a temporary regression value is calculated from the temporary regression line. An automatic moisture content measuring device characterized in that a regression line is obtained again by excluding measured values having a difference of more than a certain value, and a regression value calculated from this regression line is used to control the operation of a dryer. .