JPS6279343A - Moisture measurement of grain particle - Google Patents

Abstract

PURPOSE:To achieve a computing accuracy, by averaging remaining output voltages except for initial several and those within an initial prescribed time at respective measurement among moisture voltages obtained by electric conversion of a resistance value to draw the subsequent output voltage except a specified range. CONSTITUTION:A watermeter 1 is attached to a lift 2 of a circulation type dryer and an intake section 4 is connected to an opening 3 of a wall of the lift 2. The dryer comprises a single particle feeding mechanism 5 and a return section 8 which returns a watermeter body section 7 and overflow particles and crushed particles and the like. this mechanism 5 and the roll 6 are driven with a motor 9 and when given a drive signal, the motor 9 is reversed to send out the particles left at the mechanism 5 and on the roll 6 when a measurement is ended. Then, the roll 6 starts to turn forward to deliver specific particles taken in from the opening 3 one at a time from a retention section of the mechanism 5 to be guided onto the roll 6. The subsequent output voltages except for a specified range are averaged and taken, thereby improving computing accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grain moisture measuring method such as a grain moisture meter attached to a grain dryer.

[Prior art]

While the dryer is operating, the moisture value is measured at certain intervals in order to determine the degree of dryness. One unit (for example, one grain) of the measured position is crushed and the resistance value between the electrodes is converted into moisture. A common method is to measure multiple units and average them.

[The problem that the problem is trying to solve]

For example, when measuring moisture by reading the resistance value while crushing each grain with a pair of crushing electrode rolls, this is repeated at regular intervals, so the previously measured grains may remain crushed and attached to the roll surface, or If the data remains on the pair of crushing electrode rolls and a new measurement is to be performed, these data are output first, impairing measurement accuracy.

[Means to solve the problem]

This invention aims to solve the above-mentioned drawbacks and has taken the following technical measures.

That is, in a measurement method configured to calculate an average moisture value from each resistance value obtained by sequentially crushing one grain to several grains or one grain into one unit at a certain period, Grain moisture measurement by averaging the remaining output voltage after excluding the initial several output voltages at each measurement time or the output voltage within the initial specified time among the moisture voltages obtained by electrically converting the above resistance values. The structure of the method shall be as follows.

[Operation and effect of the invention]

When converting the moisture value from the resistance value obtained by sequentially crushing multiple units of measurement grains in a certain period, the output voltage at the start of each measurement is excluded from a specific range, and the subsequent output is considered as the regular output voltage. It is taken in and processed by arithmetic processing.

Therefore, for example, the output of the previously measured grains remaining on the crushing electrode roll, crushing f! The previously measured particles that remain attached to the electrode roll are excluded from the data at the time of the measurement, making it possible to obtain highly accurate measurement results.

Further, it is possible to eliminate outputs caused by disturbances other than the measured grain resistance, such as resistance changes inside the circuit that occur with the activation of the crushing electrode roll, making it even more accurate.

Note that the output voltage that is excluded at the start of each measurement may be set by the number of times it rises (for example, four times), or may be set to exclude the output voltage that is output at a specified time.

(Also, these may be combined. If the voltage waveform is disturbed due to remaining crushed pieces from the previous time and the rising number cannot be read accurately, it is preferable to set it to a specified time).

〔Example〕

An embodiment of this invention will be described based on the drawings.

Reference numeral 1 denotes a moisture meter attached to the elevator 2 of the circulation dryer, and the moisture meter body consists of an opening 3β in the wall of the elevator 2, an intake section 4, a grain feeding mechanism 5, and a final electrode roll 6.6. Part 7
, and a reducing section 8 for returning overflow grains and crushed grains.

Reference numeral 9 denotes the feed roll 5a of the single grain feeding mechanism 5 and the electrode roll 6.
．． 6 in forward and reverse directions.

Reference numeral 10 denotes an arithmetic control section of a microcomputer equipped with a memory for storing control programs and necessary data, and performs arithmetic and logical operations and comparison operations.

An R/V converter 11 that converts the resistance value into voltage, and an A/D converter 1 that converts the voltage from the R/V converter 11 into a digital quantity.
Detection information and the like are input through step 2.

Further, the arithmetic control unit 10 calculates the moisture value of each measured grain, counts a predetermined number of grains (16 grains), calculates their average value, outputs a signal to the display unit 13, and also starts the motor 9. , stop, forward/reverse timing signals are output.

That is, (1) a drive signal is output to the motor 9 at every certain period. (2) After receiving this drive signal, a reverse rotation command signal is output for a certain period of time immediately after. ■After reverse rotation, shift to forward rotation. (2) Immediately after normal rotation, the grains to be measured are counted after a specified time, and when a certain number of grains is counted (for example, 16 grains), a stop signal is output.

In addition, -1 The measurement grains to be converted into water content by the arithmetic control unit 10 are as follows:
This is a fixed number of grains (16 grains) after a predetermined time has passed after the motor 9 rotates normally.

During the drying operation, when a drive signal is given to the motor 9 of the moisture meter, the motor 9 first reverses, and the grain remains on the feed mechanism 5 and the electrode roll 6.6 at the end of the previous measurement. Send the measured particles outward. Next, the normal rotation is started, and the measurement grains taken in from the opening 3 of the elevator 2 are transferred from the retention part of the grain feeding mechanism 5 to one grain.
The particles are fed out one by one and guided onto the electrodes 6 and 6.
The measured grains reaching 6.6 parts by the upper electrode roll are crushed by the circumference I difference, the resistance value at that time is converted to R/V, and then A
/D conversion is carried out and taken into the arithmetic control unit 10, where it is converted into a moisture value.

The above measurement is repeated a plurality of times (16 times in the example), and each converted moisture value is averaged and output to the display section 13.

By the way, in the above embodiment, even if there is a voltage output for a specified period of time immediately after the motor 9 starts normal rotation (the electrode roll 6.6 starts normal rotation), after removing it, the average It starts counting the number of grains to be measured, and the first few times are not captured as data and are considered invalid. Therefore, even if the measured particles from the previous measurement adhere and remain, the correct measured particles are taken in by the reverse rotation or the scraping action of the cleaning brush 14.14, and then they are considered valid data, so the measurement accuracy will improve.

In addition, in addition to the previously measured grains, legitimately measured grains may be judged as invalid, but since the measured grains are taken in one after another, a predetermined number of grains (16 grains) are counted, and the motor 9 is stopped, the moisture value cannot be determined. There is no problem with calculation processing.

In this embodiment, the output voltage is removed for a specified time after the motor 9 or the electrode roll 6.6 starts regular rotation.
It is also possible to adopt a configuration in which this is not detected and taken in as data in advance.

In addition, if the motor 9 is stopped and controlled by detecting that the output voltage of the final measured grain in each cycle is below a specified value, the moisture value of the electrode roll or each measured grain can be controlled to stop the motor 9. Calculate the dispersion value from the value obtained by arithmetic processing, and if the dispersion value is large, set the number of measured grains to be larger than the specified number of grains (for example, 16 grains) (32 grains), and vice versa. By setting this to the specified number of grains (16 grains) or smaller (8 grains), the accuracy of the average moisture value calculation result can be improved. Alternatively, accurate moisture values can be calculated using a small number of samples.

In this example, one grain is regarded as one unit, and the resistance is measured for each grain and converted into a moisture value.However, one unit may also be a fixed number of two or more grains, or divided grains. good.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a front view of the moisture meter, Fig. 2 is a side view thereof, Fig. 3 is a block circuit diagram, Fig. 4 is a time-output voltage diagram, and Fig. 4 is a time-output voltage diagram. 5 shows a flowchart, and FIG. 6 shows a separate flowchart. In the figure, 1 is a moisture meter, 6, 6 is an electrode roll, 9 is a motor,
10 indicates an arithmetic control section.

Claims (1)

[Claims] In a measurement method configured to convert an average moisture value from each resistance value obtained by successively crushing multiple units of measurement grains, each of which is one grain to several grains or one grain divided into one unit at a certain period, the above-mentioned resistance Of the water voltage obtained by electrically converting the value,
A grain moisture measurement method that averages the output voltage for the initial several times during each measurement, or the remaining output voltage after excluding the output voltage within the initial specified time.