JPS6146452Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual moisture content measuring device that measures the moisture content of grain and automatically calculates an average value from a plurality of measured values.

Conventionally, in a moisture content measuring device that crushes and clamps grain between a pair of electrodes and measures the moisture content from the electrical resistance value generated between the electrodes, the sample grain required for one measurement is is around 20 grains at most. Therefore, in order to accurately measure the moisture content of a certain amount of grain, it is necessary to measure multiple samples, calculate the average value based on the individual measurements obtained, and then use this average value as the It was regarded as the moisture content value of grain. Therefore, especially in a manual moisture content measuring device in which a measurer takes a sample for each measurement, one measurer collects the measured value for each sample in order to obtain the average value as described above. It was necessary to sequentially record the values and calculate them later, and the measurement procedure was time-consuming and troublesome. For this reason, an inconvenience occurred in that it was difficult for an inexperienced measurer to obtain an accurate average value. As a means to solve this problem, it is possible to use a device that automatically calculates and displays an average value from the measured values obtained for each sample, but in this case, the following points need to be taken into consideration. For example, when using a grain such as paddy as a sample, if grains such as immature rice are mixed into the sample, only the measured value of that sample will be an abnormally high moisture content value, and this value will simply be added to the calculation of the average value. This means that the correct moisture content value for the grain as a whole cannot be obtained.

In view of the above circumstances, the present invention enables automatic calculation of the average value and also provides a command switch that allows the measurer to determine whether or not the measured value obtained for each sample should be added to the calculation of the average value. ,
Moisture content values of samples showing abnormal measurements were not included in the calculation of the average value. Thereby, it is an object of the present invention to provide a manual moisture content measuring device that allows even an inexperienced measurer to measure moisture content values easily and accurately.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external plan view of a moisture content measuring device to which the present invention is applied. In the figure, 1 is a housing, on the top of which a transparent display window 2 is formed,
Below this display window 2, a numerical display element 3 for displaying the moisture content value is provided to digitally display the measured moisture content value. Furthermore, a power indicator light 4 is provided near this. Further, in the vicinity of the display window 2, a command switch 5 for commanding storage of the measured moisture content value, a display 6 for displaying the number of stored moisture content values, and a plurality of light emitting display elements 7 are provided. have Next, inside the casing 1 (not shown), a circuit board that constitutes a measurement circuit is fixed in a flat shape, and a battery storage case for power supply and measurement aids such as a rice huller, a brush, and a spoon are also stored. do. Furthermore, a grain crushing handle 8 is provided at the right end of the housing 1, and by rotating this handle, the grain interposed between a pair of electrodes consisting of an upper electrode and a lower electrode located at the bottom of the handle 8 is crushed and clamped. . The stopper 9 is provided to restrict the rotation of the handle 8 and to keep the electrode interval constant during crushing. A measurement switch 10 is provided at a position where the rotation of the handle 8 is restricted by a stopper 9, and is turned on and off by a magnet provided on the handle 8.

Next, FIG. 2 is a block diagram of a measuring device showing an embodiment of the present invention. A pair of electrodes 11 and 12 that crush and clamp sample grains to measure electrical resistance are connected to a resistance/voltage conversion circuit 13 that converts electrical resistance into voltage.
It is connected to the. 14 inputs the output voltage as an analog quantity of the resistance/voltage conversion circuit 13;
A/D conversion circuit that converts this into a digital signal,
15 is a display storage circuit for inputting and storing the measurement data converted into digital quantities by the A/D conversion circuit; 16 is for displaying the measurement data stored in the display storage circuit 15 on the numerical display element 3; This is a display drive circuit. 17 is a timing generation circuit that inputs signals from the command switch 5 and the measurement switch 10 and generates various timing pulses (T ₁ to T ₆ ) during measurement; 18 is the display storage circuit 1;
5 is a storage circuit that sequentially temporarily stores the measured data stored in the command switch 5 based on commands from the command switch 5; and 19 is an arithmetic circuit that calculates an average value based on the measured data stored in the storage circuit 18. Above A/
D conversion circuit 14, display memory circuit 15, memory circuit 1
8. The arithmetic circuits 19 operate at timings according to the timing pulse signals (T ₁ to T ₆ ) of the timing generation circuit 17, respectively.

Next, the operation of this embodiment will be explained with reference to FIGS. 1 to 3. First, the sample grain is crushed and clamped between the electrodes 11 and 12 by rotation of the handle 8, and at the same time the measurement switch 10 is turned on by a magnet provided on the handle 8 to start measurement. Electrode 1
The electrical resistance value generated between ₁ . The data is converted into a digital quantity via the D conversion circuit 14, and then temporarily stored as measurement data (Mi) in the display storage circuit 15 using a timing pulse ( _T2 ). Next, the measurement data (Mi) stored in the display storage circuit 15 is digitally displayed as a measurement value on the numerical display element 3 via the display drive circuit 16. In this state, when the command switch 5 is turned on, the memory circuit 18 that inputs the timing pulse (T ₃ ) stores the converted value data (mi) of the measurement data (Mi) stored in the display memory circuit 15, and then The timing pulse (T ₄ ) causes the arithmetic circuit 19 to calculate an average value (;
=〓〓mi/n). This average value ()
is stored in the display storage circuit 15 by the timing pulse (T ₅ ), and thereafter is displayed as the average moisture content value of the grain in place of the measurement data (Mi) that has been displayed on the numerical display element 3. At the same time, the number of data (mi) stored in the memory circuit 18 is displayed via the arithmetic circuit 19 and the display memory circuit 15 by lighting up the light-emitting display element 7 of the display 6 by the number corresponding to the number of data stored. be done. These displays disappear when the handle 8 is rotated in the opposite direction and the measurement switch 10 is turned off. However, the data (mi) stored in the memory circuit 18 is
The memory contents are not erased even if 0 is turned off, and the memory circuit 18 sequentially stores new data (mi) in response to commands from the command switch 5 in subsequent measurements.
remember. Next, if the command switch 5 is not turned on while the measurement switch 10 is turned on and the measurement data (Mi) is displayed, the measurement data (Mi) is not stored in the storage circuit 18 and the average value calculation is also performed. The average value () is also not displayed. While the measurement switch 10 is turned on in this way,
When the command switch 5 is turned on, the currently displayed measurement data (Mi) is stored in the memory circuit 18, and at the same time, the arithmetic circuit 19 calculates the average value () and displays it on the numerical display element 3 as the average moisture content value. Is displayed. Next, when measuring the average moisture content value of a new sample grain, first turn on the measurement switch 10.
While it is OFF, turn on command switch 5.
This causes the timing pulse (T ₆ ) to reach memory circuit 1.
8, and the memory of the data (mi) stored up to that point is erased. The timing of each of the circuit operations described above is performed based on timing pulses (T ₁ to _{T 6} ) output from the timing pulse generation circuit 17.

Next, FIG. 4 is a block diagram of a measuring device showing another embodiment of the present invention. Portions common to those in FIG. 2 are designated by the same reference numerals, and description thereof will be omitted. 2
0 is a clock oscillation circuit that oscillates a reference clock for timing control, and 21 is an arithmetic processing unit (CPU) 2 that performs various data processing and arithmetic circuits.
It is a microcomputer that includes a read-only memory (ROM) 23 that stores programs in advance, and a readable and writable data storage area that temporarily stores calculation results, input data, etc. Random access memory (RAM) 24, A/D conversion circuit 14, input data buffer 25 for inputting signals from command switch 5 and measurement switch 10, numeric display elements 3, 3', light emitting display element 7 of display 6, etc. It is composed of a display control circuit 26 and the like for driving the display.

Next, FIG. 5 is a diagram showing a flowchart of the program. This program is stored in the ROM 23, and includes an A/D conversion circuit 14 connected to the microcomputer 21, a numerical display element 3,
3', display 6, etc. operate according to this program. The operation of this flowchart will be explained below. First, the program starts by turning on a power switch (not shown). Next, it is determined whether the measurement switch 10 is ON. Here, when the measurement switch 10 is turned on, the A/D conversion circuit 1
4 operates to convert the output voltage of the resistance/voltage conversion circuit 13 corresponding to the electrical resistance value of the sample grain crushed and held between the electrodes 11 and 12 into a digital quantity.
Measurement data converted into this digital quantity (Mi)
is digitally displayed as a measured value by the numerical display element 3 via the display control circuit 26. Next, it is determined whether the command switch 5 is turned on. If it is not turned on, turn on the measurement switch 1.
Repeat display of measurement data (Mi) until 0 turns OFF. When the command switch 5 is turned ON, the measurement data (Mi) displayed immediately before is stored in the RAM 24 as the data (mi) for calculating the average value.
to be memorized. Then this memorized data (mi)
Based on this, the arithmetic processing unit 22 calculates the average value ()
This average value () is displayed on the numerical display element 3' as the average moisture content value, and the data (mi) stored in the RAM 24 is displayed on the display 6.
Displays the number of memories (=number of measurements). When the measuring switch 10 is turned off, all the displays on the numerical display elements 3 and 3' are erased. Next, when measuring the average moisture content of a new sample grain, the measurement switch 10 is
By turning on the command switch 5 in the OFF state, all data (mi) stored in the RAM 24 is erased, and a new measurement becomes possible.

Next, FIG. 6 is a diagram showing a flowchart of another program. The explanation of the operation of the parts common to the flowchart of FIG. 5 will be omitted. When the program starts, first the A/D conversion circuit 1
4 to determine whether the electrical resistance value generated between the pair of electrodes 11 and 12 is greater than or equal to a predetermined value.
In the example of the previous flowchart, the determination as to whether or not the value is greater than or equal to the predetermined value is made by turning on the measurement switch 10,
Corresponds to OFF judgment. This predetermined value is the moisture content value when the sample grain is paddy, brown rice, wheat, etc.
It is about 10-12%. If the value is greater than or equal to the predetermined value, the A/D conversion circuit is operated again to display the input measurement data (Mi) on the numerical display element 3 as a measurement value. In this state, when the command switch 5 is turned on, the displayed measurement data (Mi) is transferred to the RAM 2.
4 as data (mi) for calculating the average value. Next, it is determined whether the stored data (mi) has reached a predetermined number. When it is determined that a predetermined number (for example, 5) has been reached, an average value ( ) is then calculated and displayed as a display value (average moisture content value) on the numerical display element 3'. If the number is less than the predetermined value, the average value () is not displayed, and the measured data (Mi) is displayed numerically until the grain crushing handle 8 is rotated in the opposite direction and the measured data (Mi) becomes less than the predetermined value. It is displayed on element 3 as a moisture content value. In this way, in this example, the average value is calculated only when the number of stored data (mi) reaches a predetermined value, and the result is displayed as the average moisture content value. Since the average moisture content value is always obtained based on the same number of memorized data (mi), regardless of the will of the person,
More stable and accurate measurements are made. Furthermore, since there is no need to provide the measurement switch 10 in this embodiment, it is only necessary to operate the command switch for storing the measurement data (Mi), and erroneous operation of the switch can be prevented.

As described above, according to the present invention, there is no need to record the measured values obtained for each sample as in the past.
A more accurate measurement is obtained because the average moisture content value of the grain can be easily obtained and at the same time, abnormal moisture content values can be avoided from being added to the calculation of the average moisture content value.

[Brief explanation of the drawing]

Fig. 1 is an external plan view of a moisture content measuring device to which an embodiment of the present invention is applied, Fig. 2 is a block diagram of the measuring device which is an embodiment of the present invention, and Fig. 3 shows the operation of Fig. 2. FIG. 4 is a block diagram of a measuring device using a microcomputer, and FIGS. 5 and 6 are flowcharts of the operation of FIG. 4. 3, 3'...Numeric display element, 5...Command switch, 8...Handle, 11, 12...Electrode, 13
...Resistance/voltage conversion circuit, 14...A/D conversion circuit, 18...Memory circuit, 19...Arithmetic circuit, 21
...Microcomputer, 24...RAM.

Claims (1)

[Scope of utility model registration request] A moisture content measuring device that crushes and clamps a sample grain between a pair of electrodes and measures a moisture content value from its electrical resistance value, comprising a converting means for converting the electrical resistance value into a moisture content value of the grain; a storage means capable of storing a value; a command switch for instructing the storage means to store a moisture content value; a calculation means for calculating an average value from a plurality of moisture content values stored in the storage means; and the crushing clamp. Moisture content having an average value display function, characterized in that it is equipped with a display means for inputting the moisture content value of the grain inside and displaying it as a display value, and displaying the average value in conjunction with the operation of the command switch. rate measuring device.