JPH0428056Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a moisture meter that is used in grain driers and the like to measure the moisture content of grains. Concerning improvements to moisture meters.

(Prior Art) This type of single-grain moisture analyzer has a pair of electrode rolls for moisture measurement and a feed roll that supplies grains one by one at predetermined intervals between the electrode rolls. It consists of a grain supply mechanism.

When measuring the moisture content of grains in the dryer, the grain supply mechanism takes out the grains from the dryer and supplies them between the electrode rolls. The resistance between the two is converted into voltage using a resistance-voltage conversion circuit.

As mentioned above, this moisture analyzer can detect grains in the dryer,
That is, in addition to measuring internal samples, it is also possible to measure grains outside the dryer, ie external samples. In the case of measurement of an external sample, grains of a predetermined external sample are introduced into an external supply hopper extending above the electrode roll, and the multiple grains are guided onto the electrode roll for moisture measurement.

(Problem to be solved by the invention) By the way, in order to detect a single piece of data from the moisture voltage output from the resistance voltage conversion circuit, a predetermined period of time (for example, 3 seconds) is required from the rise of the moisture voltage.
I am trying to find the maximum value within. Then, this maximum value is read into the microcomputer as data for one grain, and is used for moisture content calculation.

Therefore, for example, if the output waveform of the moisture voltage ER output from the resistance voltage conversion circuit is as shown in Fig. 4,
Each maximum value M1 to M within a predetermined period T1 to T6 from each rise of each moisture voltage ER1 to ER4
6 is detected.

However, these maximum values M1 to M6 are the moisture voltages ER1, ER3, and ER4 when multiple grains are simultaneously supplied to the electrode roll for some reason.
Therefore, there is a problem in that all of them are inappropriate as detection data for one grain.
Furthermore, in the case of FIG. 4, although the maximum value M7 of the moisture voltage ER2 when one grain is supplied to the electrode roll is appropriate as detection data for one grain, It had the disadvantage of being excluded.

These problems occur not only when measuring only internal samples as described above, but also when measuring external samples while measuring internal samples, preventing accurate detection data and preventing moisture measurement. reduce reliability.

Therefore, the purpose of the present invention is to eliminate the above-mentioned drawbacks, eliminate the detection data obtained when multiple grains are fed to the electrode roll, and ensure that only accurate detection data is obtained. The objective is to improve the reliability of moisture measurement.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a moisture signal generating means A that crushes grains with an electrode roll and generates a moisture signal corresponding to the grains; Moisture detection means B that detects moisture based on a moisture signal; Counting means C that compares the moisture signal with a predetermined value and counts the time from when it exceeds the predetermined value until it falls below the predetermined value; When the time counted by the counting means C exceeds a predetermined particle number discrimination reference time, the moisture detecting means B
The moisture output inhibiting means D for inhibiting the output from the moisture output inhibiting means D is provided.

(Function) As shown in FIG. 1, in the present invention, the counting means C compares the moisture signal from the moisture signal generating means A with a predetermined value, and after the moisture signal exceeds the predetermined value, it continues until the moisture signal falls below the predetermined value. Count the time.

When the time counted by the counting means C exceeds a predetermined particle number discrimination reference time, the moisture output inhibiting means D
prohibits the output of moisture detection means B.

(Embodiment) Figure 2 is a block diagram of a first embodiment of the present invention.

In the figure, numerals 1 and 1 are a pair of rotatable electrode rolls for moisture measurement, and when grains pass between the electrode rolls, a resistance voltage conversion circuit 2 measures the change in resistance between the electrode rolls. Convert to voltage. 3 is an A/D converter which A/D converts the moisture voltage ER from the resistance voltage conversion circuit 2 and supplies it to the microcomputer 4.

The microcomputer 4 makes various judgments as shown in FIG. 3, for example, and controls each component as described later. 5 is microcomputer 4
This is an output interface connected to the output interface, and a display section 6 consisting of a 7-segment LED or the like for displaying moisture content is connected to the output side.

Next, the operation of the first embodiment configured as described above will be explained with reference to FIGS. 3 and 4.

Now, the grain feeding mechanism (not shown) is activated,
When grains (internal samples) in the dryer are supplied to the electrode rolls 1, 1, as the electrode rolls 1, 1 rotate, a moisture voltage ER is generated from the resistance voltage conversion circuit 2 as shown in FIG. Output.

Then, each period T01 to T04 from each rise to each fall of each moisture voltage ER1 to ER4
is counted by a counter (not shown) serving as a counting means, and the maximum values M1, M7, M4, and M6 in each period T01 to T04 are detected by the procedure shown in FIG. 3, respectively.

That is, when the moisture voltage ER is larger than a predetermined threshold ES (see Figure 4), the moisture voltage ER is A/D converted by the A/D converter 3, and the maximum value at that time is detected. (Steps S1 to S4). The maximum values M1, M7, M4, and M6 thus detected are used for water content calculation as normal measurement data when they meet predetermined requirements as described later (step S5).

On the other hand, after each period T01 to T04 ends, the count value of the counter corresponding to each period T01 to T04 is compared with a predetermined value.

Then, when the counted value is less than a predetermined value and the measured grain is regarded as one grain, as in the period T02, the maximum value M7 in that period is used as normal data for the above-mentioned moisture calculation. On the other hand, when the counted value is greater than a predetermined value and the measured grains are considered to be multiple grains, as in periods T01, T03, and T04, the maximum values M1, M4, and M6 in each period are excluded as abnormal data. However, it should not be used in the moisture content calculation described above.

In this way, according to the first embodiment, when a plurality of grains are supplied to the electrode rolls 1, 1 to be measured, the detected data is excluded as abnormal data and is not used for moisture content calculation. , it is possible to eliminate the adverse effects when a plurality of grains are measured.

Next, a second embodiment of the present invention will be described. Its configuration is similar to the first embodiment shown in FIG. 2, and only the control procedure is different, so please refer to FIGS. 5 and 6. Only an example of its operation will be explained.

Now, the grain supply mechanism (not shown) is activated, and the grains (internal sample) in the dryer are transferred to the electrode roll 1,
1, the moisture voltage ER is output from the resistance voltage conversion circuit 2 and sampled (step S11).

Then, as shown in FIG. 6, the time when the moisture voltage ER exceeds a predetermined threshold value ES is counted by a counter (not shown) as a counting means (step S12). Next, it is determined whether the count value of the counter is larger than a predetermined value α (step S13).

When the counted value is smaller than the predetermined value α, as at time t1 shown in FIG. In addition to providing the calculation, preparations for the next measurement are made (step S16).

On the other hand, when the count value is larger than the predetermined value α, as at time t2 shown in FIG. Step S15),
At that time, detection data related to multiple grains is excluded as abnormal data and is not used for moisture content calculation.

As described above, according to the second embodiment, when an external sample is measured while an internal sample is being measured, the detection data related to the external sample is excluded as abnormal data and is not used for moisture content calculation. Therefore, the harmful effects caused by external samples can be eliminated.

(Effects of the invention) As described above, according to the invention, detection data obtained when multiple grains are simultaneously supplied to the electrode roller is eliminated, and the detection data is not used for moisture content calculation. Therefore, only accurate detection data can be obtained, and the reliability of moisture measurement can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is a functional diagram of the present invention, Fig. 2 is a block diagram of the first embodiment of the invention, Fig. 3 is a flowchart showing an example of its operation, Fig. 4 is a diagram showing the water voltage, and Fig. 4 is a diagram showing the water voltage. FIG. 5 is a flowchart showing an example of the operation of the second embodiment of the present invention, and FIG. 6 is a diagram showing the water voltage. A is moisture signal generation means, B is moisture detection means, C
is a counting means, and D is a means for inhibiting moisture output.

Claims (1)

[Claims for Utility Model Registration] Moisture signal generating means for crushing grains with an electrode roll and generating a moisture signal corresponding to the grains; Moisture detecting means for detecting moisture based on the moisture signal; a counting means for comparing the moisture signal with a predetermined value and counting the time from when the moisture signal exceeds the predetermined value until it falls below the predetermined value; and when the time counted by the counting means exceeds a predetermined grain number discrimination reference time; and a moisture output inhibiting means for inhibiting output from the moisture detecting means.