JPH0772104A - Detector for grain moisture - Google Patents

Abstract

PURPOSE:To remove measured grains in the preceding test stagnated on electrode rolls to be provided on a moisture detector. CONSTITUTION:In a grain moisture meter formed for converting an average moisture value from several resistance values obtained by crushing the grains by a normal rotations of a pair of left and right electrode rolls 6, 6, receiving grains drawn out and supplied by receiving a measuring signal at intervals of a certain period, a control part for outputting normal and reverse rotation driving signals for reversing for a limited time and then for normally rotating a motor 9 for rotating, in gearing, these electrode rolls 6, 6, etc., by a moisture measuring command signal, is provided, and grains in the preceding test left on the rolls 6, 6 are removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grain moisture detector.

[0002]

2. Description of the Related Art While a dryer is operating, in order to know the degree of dryness, the moisture value is measured every certain period. The particles to be measured are crushed by a pair of electrode rolls and the resistance value between the electrodes is converted to moisture. The general method is to obtain it. Moisture measurement is performed in a certain cycle as described above, but even after the moisture measurement in the electrode roll is completed, the grains are fed to the electrode roll and old grains remain on these electrode rolls until the next measurement. I have something to do.

[0003]

Therefore, at the time of this measurement, the old grains are detected prior to or at the same time as the grains newly fed out and supplied, which deteriorates the accuracy of the measured values this time.

[0004]

In order to solve the above-mentioned drawbacks, the present invention receives a measurement signal at a certain cycle and feeds the fed grain to the normal rotation of a pair of left and right electrode rolls 6, 6. In the grain moisture meter configured to convert the resistance value obtained while crushing according to (a) to the moisture value, the motor 9 that interlocks the electrode rolls 6, 6 and the like is rotated for a certain period of time by a moisture measurement start command signal. A grain moisture measuring device is characterized in that it is provided with a control unit 10 which outputs a forward / reverse drive signal for interlocking with reverse rotation (b) and then for forward rotation (a).

[0005]

[Effects of the Invention] The grain reaches between the pair of left and right electrode rolls 6 and 6 through an appropriate feeding mechanism,
Is crushed in accordance with the normal rotation (a), its electric resistance value is detected, and converted into a moisture value by the control unit 10. The control unit 10 periodically outputs the moisture measurement signal, but immediately after the moisture measurement signal is output, a reverse rotation command signal is output to the moisture meter drive motor 9. Therefore, it is accumulated on the electrode rolls 6 and 6 which are not operating from the end of the previous measurement to the current measurement, but this stagnant grain is reversed by the electrode rolls 6 and 6 in response to the reverse rotation command of the motor 9 (b). Therefore, along with this, the left and right electrode rolls 6 and 6 are discharged out of the intake area. After that, the electrode rolls 6 and 6 are switched to the normal rotation (a), so that the moisture is detected by the grains newly taken in by the feeding mechanism as appropriate.

[0006] As described above, the electrode rolls 6 and 6 are reversed (b) for a predetermined period after the start of the moisture measurement to take in the old grain and push it out of the range to obtain a precise moisture based on the new grain. Detection processing is possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a moisture meter attached to an elevator 2 of a circulation type dryer, and a moisture meter main body portion 7 including an intake portion 4 connected to an opening 3 on the wall of the elevator 2 and a 1 grain feeding mechanism 5 and electrode rolls 6 and 6. ,
And a reducing unit 8 for returning overflow particles and crushed particles.

Reference numeral 9 is a motor for interlocking the feeding roll 5a and the electrode rolls 6 and 6 of the one grain feeding mechanism 5 in the forward and reverse directions. 10
Is an arithmetic control unit of a microcomputer having a memory for storing a control program and necessary data, and performs arithmetic logic operation and comparison operation. The calculation control unit 10 includes an R / V converter 11 for converting the resistance value of the measurement particles crushed by the peripheral speed difference between the electrode rolls 6 and 6 into a voltage.
A / V that converts the voltage from the V converter 11 into a digital quantity A /
Detection information and the like are input via the D converter 12. Further, the calculation control unit 10 counts a predetermined number of particles (16 particles) while calculating the moisture value of each measured particle, calculates the average value of them, outputs a signal to the display unit 13, and starts the motor 9. , Stop, forward / reverse rotation timing signals are output.

That is, a drive signal is output to the motor 9 every certain period. Upon receiving this drive signal, the reverse (b) command signal is output for a fixed time immediately after. After reverse rotation (b), forward rotation
Move to (a). Immediately after the normal rotation (a) and after a stipulated time, the measured particles are counted, the fixed number of particles is counted, and when the fixed number of particles is counted thereafter (for example, 16 particles), a stop signal is output.

The measurement particles to be converted into water by the arithmetic control unit 10 are constant particles (16 particles) after the motor 9 is rotated in the normal direction (a) and after a predetermined number of particles. The operation of the above example will be described. When a drive signal is given to the motor 9 of the moisture meter during the drying operation, the motor 9 first reverses (b), and at the end of the previous measurement, the single grain feeding mechanism 5 and the electrode roll 6, 6. Send out the measurement particles remaining on the outside. That is, the grains that are stagnant on the electrode rolls 6 and 6 are forced to the outside of the grain intake area by reversing (b) the electrode rolls 6 and 6. Then, the electrode roll 6,
6 starts the normal rotation (a). After that, elevator 2
The measurement particles taken in through the opening 3 of the above are fed out one by one from the retention portion of the one-grain feeding mechanism 5 and guided onto the electrode rolls 6, 6.

The measurement particles reaching the electrode rolls 6 and 6 are crushed by the peripheral speed difference, and the resistance value at that time is R / V converted,
Then, it is A / D converted, taken into the arithmetic control unit 10, and converted into a moisture value. The above measurement is repeated a plurality of times (16 times in the example), and the converted moisture values are averaged and output to the display unit 13.

[Brief description of drawings]

FIG. 1 is a front view.

FIG. 2 is a side view thereof.

FIG. 3 is a control block diagram.

FIG. 4 is a time-output voltage diagram.

FIG. 5 is a flowchart.

[Explanation of symbols]

1 ... Moisture meter, 2 ... Elevator, 3 ... Opening, 4 ... Intake part, 5 ...
1-grain feeding mechanism, 6, 6 ... Electrode roll, 7 ... Moisture meter main body section, 8 ... Reduction section, 9 ... Motor, 10 ... Calculation control section, 11
... R / V converter, 12 ... A / D converter, 13 ... Display section

Claims (1)

[Claims] 1. A resistance value obtained by crushing a grain fed by receiving a measurement signal at a certain cycle by forward rotation (a) of a pair of left and right electrode rolls 6, 6 into a moisture value. In the grain moisture meter configured to do so, the motor 9 that rotates and interlocks these electrode rolls 6, 6 and the like is interlocked in reverse (b) for a certain period of time by a command signal to start moisture measurement, and then in forward (a) interlock. Therefore, the grain moisture measuring apparatus is provided with a control unit 10 for outputting a forward / reverse drive signal.