JPH037901B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a grain moisture content measuring device, and in particular, it is possible to switch grain types at any time during moisture content measurement, and this switching allows measurement of different types of grains. The present invention relates to a grain moisture content measuring device that does not cause inconveniences such as values being mixed into the average value or all measured values before switching being ignored.

[Technical Background of the Invention] Conventionally, a moisture content measuring device having a means for measuring the moisture content of multiple types of grains and a means for calculating an average value of the moisture contents measured an arbitrary number of times has been used in combination with both functions due to unnecessary switching of grain types. In order to prevent this, the switchable period is limited as shown in FIG.

FIG. 1A shows the measurement flow of a manual moisture content measuring device that requires a measurement operation for each measurement.
The first example in Figure A is a device that has a period in which the grain type can be switched from the start of sampling to the end of displaying the measured value, and when the grain type is switched within this period, the measured value is converted and displayed. The period in which the average value is displayed is not converted even if the value is changed, and there is a warning for this period. (Utility Model No. 57-19055).
Furthermore, some of the above-mentioned manual moisture content measuring devices have a changeover switch such as a measurement switch that commands execution or an average switch (Utility Model No. 58-
No. 14865). The second example in Figure A is a device that has a period that can be switched only at the time of sampling, and for this switching, the measured value is converted and displayed. For switching after the second measurement, in order to prevent the measured values of different grains from being mixed into the average value, all the measured values before switching are canceled and the measured values at the time of switching are used as the new measurements for the first measurement. It is treated as a measured value.

FIG. 1B shows the measurement flow of an automatic moisture content measuring device that continuously measures an arbitrary number of times, and the hardware allows measurement of multiple types of grains.
In the hardware method, the constants of the linearization circuit are changed by switching the circuit elements of the measurement circuit using a changeover switch or the like so that a moisture content suitable for the grain type can be obtained. The period during which the grain type of this device can be changed is during measurement, and the constants of the linearization circuit are changed in conjunction with the selection of the grain type, and the measured values are converted in response to the change during continuous measurement. .

[Problems with Background Art] However, in these conventional moisture content measuring devices, selection of the grain type is performed manually, and therefore, erroneous operation may occur, and in such cases, the following inconveniences occur. In other words, in the first example in Figure A, even if you notice an incorrect operation, you cannot change the grain type while the average value is being displayed, and if you change it during the second measurement, the first measurement value will remain the same and the grain type will be changed to the second measurement. Since the measured values are converted in accordance with the switching, there is a disadvantage that the average value is an average value that includes the measured values of different types of grains.

In the second example in Figure A, if you notice an erroneous operation and switch after several measurements, the measured value before switching is lost, and you have to start a new measurement from the first time, which is time-consuming.

Furthermore, the automatic device shown in Figure B cannot be switched while the average value is being displayed, as in the first example, and
This method has the disadvantage that the measured values of different types of grains are mixed into the average value when switching at the time of measurement.

Therefore, with conventional moisture content measuring devices, the period during which grain types can be changed is limited, and if the grain type is changed for the first time, the measured values of different types of grains may be mixed in, or all measured values before switching are lost. There were some inconveniences.

[Purpose of the invention] Therefore, the present invention makes it possible to switch grain types at any time during moisture content measurement, and also prevents the measurement values of different grains from being mixed into the average value due to the switching, and the measurement values before the switching being all It is an object of the present invention to realize a grain moisture content measuring device that does not cause inconveniences such as failure of calculation.

[Structure of the Invention] In order to achieve this object, the present invention uses an electric signal generated between a pair of electrodes to calculate the moisture content of a plurality of types of grains in a moisture content measuring device having a moisture content measuring means and an average value calculating means. a moisture content measuring means for converting into measured value data, a grain type inputting means for generating a grain type signal of the grain to be measured, a moisture content storage means for storing the measured value data, average value data, and display data; grain type storage means for storing the grain type; average value calculation means for calculating an average value from the average value data to obtain average value data; and grain type for which the measured value data for each measurement is initially set. and storing each converted data and grain type in the moisture content storage means and the grain type storage means, and when displaying the measured value and the average value using the display data, Consisting of a conversion control means for converting into data corresponding to the most recently set grain type, a display control means for reading the display data and outputting a display signal to the next stage, and a display means for inputting and displaying the display signal. It is characterized by what it did.

[Embodiments of the Invention] Next, embodiments of the invention will be described in detail based on the drawings. 2 to 5 show embodiments of this invention.

In FIG. 2, 2 is a moisture content control means, 4 is a grain type input means, 6 is a moisture content storage means, 8 is a grain type storage means, 10 is an average value calculation means, 12 is a conversion control means, and 14 is a display control. Means 16 is a display means. Of these, the moisture content storage means 6, the grain type storage means 8, the average value calculation means 10, the conversion control means 12, and the display control means 14 are configured as a microcomputer 18 for control.

Each of these functions will be explained. The water content measuring means 2 converts an electric signal generated between a pair of electrodes into water content measurement value data. Grain type input means 4 selects the grain to be measured and generates a grain type signal corresponding to the type. The moisture content storage means 6 stores the measured value data of the moisture content obtained by the moisture content measuring means 2,
Average value data for each measurement for calculating the average value and display data of the average value or measured value for displaying the average value or measured value are stored. The grain type storage means 8 stores the grain types corresponding to each data in the moisture content storage means 6 and the grain type input means 4.
Memorizes the grain type input from . The average value calculation means 10 inputs the average value data of the moisture content storage means 6, calculates an average value, and outputs it as average value data. The conversion control means 12 first inputs the signal of the grain type set for the _first time from the grain input means 4 at time t1 shown in FIG.
to be memorized. The measured value data of the moisture content for each measurement is converted into data corresponding to the initially set grain type and stored in the moisture content storage means 6 as average value data and display data. The measured value data for each measurement is output as display data by the display control means 14, but when the grain type is switched at time _t2 in FIG.
reads the newly input signal of the latest grain type and the grain type of display data from the grain type storage means 8 and compares it. If the grain types are different in this comparison, the data is converted into data corresponding to the most recently set grain type and is stored in the moisture content storage means 9. The information is stored in the person type storage means 8. Also,
The conversion control means 12 stores the average value data inputted from the average value calculation means 10 as display data in the water content storage means 6, and also stores the grain type in the grain type storage means 8. Display control means 14
reads the display data from the moisture content storage means 6 at time t ₂ and outputs a display signal to the display means 16 to display the moisture content.

These moisture content measuring means 2 to microcomputer 18 have a circuit configuration as shown in FIG. In the figure, reference numeral 20 denotes a pair of electrodes that measure the electrical resistance by holding the sample grain in an indentation frame. The resistance value generated between the electrodes 20 is converted into voltage.
The A/D conversion circuit 24 is the resistance/voltage conversion circuit 22
voltage is input and converted to a digital signal. These electrodes 20, resistance/voltage conversion circuit 22, and A/D conversion circuit 24 constitute the moisture content measuring means 2.

26 is a grain type setting switch in which a contact point such as a rotor switch corresponds to a grain type; 28
converts the contact signal from this setting switch 26 into a grain type signal and sends it to the input data buffer 56, which will be described later.
The setting switch 26 and multiplexer 28 constitute the grain type input means 4. This multiplexer 28 includes a stop moisture content setting switch 30 for setting the stop moisture content of the dryer (not shown), and a group of limit switches 32 for detecting the position of a drive motor (not shown) that connects and separates the electrode 20. Signals from and are also input. Further, 34 is a test operation command switch, and 36 is a clock oscillation circuit that oscillates a reference clock for timing a timer and other controls. The above constitutes an input section of the control means.

The microcomputer 18 is configured as follows. That is, there is a register that temporarily stores various data, an arithmetic processing unit 38 that performs various arithmetic processing and control, a timer circuit that can freely set the time based on instructions from the arithmetic processing unit 38, and an arithmetic processing unit 38 that indicates the completion of tire operation. a timer interrupt control circuit 40 consisting of a circuit that issues an interrupt command to the arithmetic processing unit 3;
The A/D conversion interrupt control circuit 42 consists of a circuit that instructs the A/D conversion circuit 24 to start A/D conversion in response to the command 0, and a circuit that instructs the arithmetic processing unit 38 to interrupt the conversion completion. There is.

Furthermore, there is a read-on memory (hereinafter referred to as ROM) 44 which stores a measurement program in advance, and a plurality of read-on memories (hereinafter referred to as ROM) which temporarily store input data such as average value calculation results and moisture content and grain type by the arithmetic processing unit 38. A readable and writable random access memory for data consisting of a storage area of
A display control circuit, which is the display control means 14, includes a RAM (referred to as RAM) 46, a decoder that converts each water content data sent from the arithmetic processing unit 38 into a display signal, and a drive circuit that drives a display 64, which will be described later. 48, and input data buffers 54, 56, and 58 that temporarily store data from the A/D conversion circuit 24, multiplexer 28, and test switch 34 and output them to the input data bus 52 according to commands from the arithmetic processing unit 38 via the control signal line 50. The microcomputer 18 is comprised of an output data buffer 62 that temporarily stores output data transmitted from the arithmetic processing unit 38 via the output data bus 58 in response to a command from the control signal line 50 of the arithmetic processing unit 38.

The display control circuit 48 of the microcomputer 18 causes the display 64 serving as the display means 16 to display numerical values in order to display various data on the moisture content, and the relay driver 66 controls the motor according to the data temporarily stored in the output data buffer 62. drives a group of relays 68 for fuel stop, etc. In the figure, 70 is a ROM address bus that transmits address data from the arithmetic processing unit 38 to the ROM 44, 72 is a ROM data bus that transmits program data to the arithmetic processing unit 38, and 74 is a timer interrupt control circuit from the arithmetic processing unit 38. A timer interrupt control signal line 76 transmits a timer start command signal to the processor 40 and a timer interrupt signal to the processor 38;
8 to the A/D conversion interrupt control circuit 42 and the A/D conversion start command signal to the arithmetic processing unit 38.
This is an A/D conversion interrupt signal line that transmits a D conversion interrupt signal.

4 and 5 are flowcharts showing the operation of this embodiment. FIG. 4 is a flowchart for controlling a series of operations, and FIG. 5 shows a timer interrupt control circuit 40 generating an interrupt signal at a constant cycle,
This is a flowchart for timer interrupt processing that controls operations when this signal is detected. Note that the period is set, for example, to the lighting time of one digit of a dynamically driven numeric display.

The operation will be explained with reference to FIG. When the power is turned on, the program starts according to the program stored in the ROM 44. A sample grain is sampled, crushed and held between a pair of electrodes 20, and measured. In the measurement, the resistance/voltage conversion circuit 22 detects the voltage as a voltage according to the grain type using a constant set by the linearization circuit, and the A/D conversion circuit 24 converts it into a digital signal. This signal is temporarily stored in the moisture content storage means 6 of the RAM 46 as moisture content measurement value data.

Next, the grain type selected by the grain type input means 4 is read. This is the reading of the initially set grain type shown at time t1 in FIG. ₁ at the time of the first measurement. The grain type signal generated by the multiplexer 28 is input to the grain type storage means 8 of the RAM 46.
Temporarily memorize.

Next, it is determined whether or not this is the first measurement. Here, the explanation will be given as the first measurement.

The grain type of the constant set by the linearization circuit, that is, the grain type of the measured moisture content, is compared with the grain type temporarily stored in the RAM 46, which is initially set by the grain type input means 4, and the initially set grain type is determined. Determine whether or not to convert the measured value data.
If the grains are of the same type, proceed to data storage. If it is a different type of grain, the measured value data is converted to data corresponding to the grain type set at the beginning of time _t1 .

The measured value data converted to the initially set grain type is stored in the average value data storage area and the display data storage area of the moisture content storage means 6 of the RAM 46.
These are stored as average value data and display data, respectively. Furthermore, the grain type corresponding to each of these data, that is, the signal of the grain type initially set by the grain type input means 4, corresponds to the measured value data, average value data, and display data of the grain type storage means 8 of the RAM 46. The data is stored in the specified storage area.

Next, the first moisture content measurement value is displayed. The display is performed according to the program shown in FIG.
By proceeding through the YES step, the stored display data will be displayed. The switching of the grain type displayed will be described later.

After this display, it is determined whether or not the five measurements have been completed. Assuming it has not finished, return to the sampling step. The steps of sampling, measuring, and reading grain types are performed in the same manner as described above.

Next, since it is the second measurement, proceed to NO.
In the first data storage step, the grain type signal stored in the storage area of the grain type storage means 8 of the RAM 46 in correspondence with the measured value data, that is, the grain type signal set initially, is read, and the grain type signal indicated by this signal is read. The second moisture content measurement data is converted into data corresponding to the grain type.

This converted measurement value data is converted to
The average value data and display data are stored in the average value data storage area and the display data storage area of the moisture content storage means 6 of the RAM 46, respectively, and the grain types of the average value data and display data are Set grain type in RAM46
is stored in a storage area corresponding to the measured value data, average value data, and display data of the grain type storage means 8.

Next, the display data is displayed on the display 64. After displaying, judge whether the 5 measurements have been completed or not.
If NO, perform the same steps as above.

If YES, proceed to the step of calculating the average value.
The average value calculation is an operation in which the sum of the data of the five measurements for the initially set grain type stored in the average value data area of the moisture content storage means 6 of the RAM 46 is divided by five. The sum of the data in the average value data area may be stored for each measurement, and the sum may be divided by five.

The average value data returned by this calculation is stored in the display data area of the moisture content storage means 6, and
A grain type signal corresponding to the grain type in the average value data area is stored in a storage area of the grain type storage means 8 corresponding to the display data area.

Next, this average value data is displayed, and the display will be described later.

As you can see from the above operations, the measured value data of moisture content for each measurement is converted to the grain type initially set in the first measurement and becomes average value data and display data. is also calculated based on the grain type set at the beginning of time _t1 and becomes display data.

Next, it is determined whether or not to stop the dryer. In this case, when the average value data becomes equal to or less than the stop moisture content set in advance by the stop moisture content setting switch 30, it is determined that the dryer is stopped, and the dryer is stopped and the operation is completed. If the stop moisture content has not been reached, the waiting time until the next automatic measurement is determined, and when the waiting time ends, the process returns to the sampling step and performs the operations described above. Note that during the waiting time, the display 64 displays the average value.

Next, timer interrupt processing by the timer interrupt control circuit 40 will be explained with reference to FIG. This operation is
This is executed by a timer interrupt signal generated by the timer interrupt control circuit 40 after a certain period of time has elapsed.

After completing a series of operations, conversion control begins.

First, it is determined whether or not it is being displayed. This is determined by, for example, a flag indicating that the measured value of the moisture content is displayed or the average value is displayed. If it is displayed, the grain type set at that time, that is, the latest grain type, is read and RAM 46 is loaded.
input into the grain type storage means 8.

Next, compare the latest input grain type signal with the grain type corresponding to the displayed data, switch the grain type setting at time _t2 during display, and if they are different, correspond to the latest switched grain type. Convert display data to data. If the grain types are the same, proceed to the step of turning off the display.

The displayed data converted to the latest grain type is stored again in the display data area of the moisture content storage means 6, and the converted grain type, that is, the latest grain type is stored in the grain type storage means 8 corresponding to the displayed data.
It is stored in the storage area of .

Next, the display 64, which had been lit until then, is turned off, and the digits are displayed based on the converted display data. This display is performed by sequentially lighting up the data of the necessary digits from the display data area.

After performing the necessary processing for display, the process returns to the interrupted step in FIG.

As described above, when displaying the average value or each measured value of moisture content, the displayed data is changed according to the change of the grain type setting by the program of the timer interrupt processing that is executed periodically. Convert data to correspond to the latest grain type and display new data. The period of this timer interrupt and the time required for conversion are several milliseconds, and are instantaneous.

To summarize the operation of the flowcharts shown in Figures 4 and 5 above, the measured value data of the moisture content measured for each measurement is converted to the grain type initially set at time t ₁ in the first time, and then converted to the average value. data and display data, and this display data is displayed each time it is displayed.

In this case, if the grain type in the displayed data (i.e., the initially set grain type read in the first measurement at time _t1 ) and the latest grain type at the time of display are different due to the setting change, The timer interrupt control circuit converts the display data into data corresponding to the latest set grain type, and the converted display data is displayed, so that the converted data can be instantly converted and displayed in accordance with the grain type. Furthermore, even if the setting of the grain type is switched during display, that is, at time _t2 , the latest grain type is input and converted by the timer interrupt process, so display data corresponding to the grain type is displayed.

The average value is also calculated from the average value data obtained at time t ₁ , that is, with the grain type initially set in the first measurement, and when starting the display, if the grain type is different due to switching of settings. Since the displayed data is converted into data corresponding to the latest grain type switched by the timer interrupt process, an average value that is not mixed with the measured values of different grains is displayed corresponding to the latest set grain type.

Therefore, no matter when you change the grain type setting, the measured values are converted and displayed according to the grain type, and the average value is also converted and displayed without mixing the measured values of different types of grain, so it is compatible with the change. It is now possible to display

In the example, the grain type is read during the first measurement, that is, at time t ₁ , and during the display, that is, at time t ₂ . The calculation may be performed, and the time at which the average value is calculated may be set at t ₁ and the time at which it is displayed may be set at t ₂ . Also,
At this time, instead of converting the average value to different grain types, the set stop moisture content may be converted to the grain type setting and compared. In short, the time t ₁ is a time during which the measured value of the moisture content of the different type of grain is not mixed into the average value, and the time t ₂ B may be the time being displayed.

Furthermore, in the example, each data is converted as needed, but this conversion is performed by converting each data into each grain type and storing it in each data storage area for each grain, and then converting the stored data at the time of conversion. You can also read it. In other words, the expression "conversion" means that the data corresponding to each type of grain that has been calculated and stored in advance is
It can also be interpreted as a process of reading from the moisture content storage means.

[Effects of the Invention] As described above, according to the present invention, no matter when the type of grain is switched, the data can be converted to the type of grain by the conversion control means and displayed. Moreover, since the average value is calculated and converted using the average value data stored for the same grain type, there is no problem of the average value being mixed with the measured values of different types of grains, and there is no need to cancel the measured values due to switching. So,
There is no inconvenience of redoing the measurement.

[Brief explanation of the drawing]

FIGS. 1A and 1B are diagrams showing the measurement flow of a conventional moisture content measuring device. 2 to 5 show an embodiment of the present invention, with FIG. 2 being a schematic block diagram, FIG. 3 being a schematic block diagram of a circuit, and FIGS. 4 and 5 being flowcharts, respectively. In the figure, 2 is a moisture content measuring means, 4 is a grain type inputting means, 6 is a moisture content storage means, 8 is a grain type storage means, 10 is an average value calculation means, 12 is a conversion control means, 14 is a display control means, 16 is a display means;
18 is a microcomputer, 38 is an arithmetic processing unit, 40 is a timer interrupt control circuit, 42 is an A/D conversion control circuit, 44 is a read-only memory, 46 is a random access memory, 48 is a display control circuit,
64 is a numeric display.

Claims (1)

[Claims] 1. In a moisture content measuring device having a moisture content measuring means for multiple types of grains and an average value calculating means, the moisture content measuring means converts an electric signal generated between a pair of electrodes into moisture content measurement value data, and a moisture content measuring means to be measured. grain type input means for generating a grain type signal of grain; moisture content storage means for storing measured value data, average value data, and display data; grain type storage means for storing the grain type; and the average value. an average value calculation means for calculating an average value from the data for each measurement and converting the measured value data for each measurement into data corresponding to the initially set grain type; Conversion that stores the type in the moisture content storage means and the grain type storage means, and converts the display data into data corresponding to the latest set grain type when displaying the measured value and the average value using the display data. A grain moisture content measuring device comprising: a control means; a display control means for reading the display data and outputting a display signal to the next stage; and a display means for inputting and displaying the display signal.