JPH102871A - Moisture measurement control device of grain moisture meter - Google Patents

Abstract

(57) [Summary] [Problem] To press and grind a grain between detection rolls, the posture of the grain is supplied between the detection rolls.
Due to a change in the detected voltage waveform, accurate detection of grain moisture could not be performed. SOLUTION: A voltage V2 waveform obtained by removing a high-frequency noise voltage VA included in a voltage V1 waveform detected from crushed grains pressed and crushed between detection rolls 32, 32, and a voltage V2
The voltage V3 waveform obtained by delaying the waveform by a predetermined time is compared, and the voltage VB value at the intersection of the voltage V2 waveform and the voltage V3 waveform is replaced with the detected grain moisture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture control device for a grain moisture meter for measuring grain moisture during drying by using the grain dryer for drying grains.

[0002]

2. Description of the Related Art For example, in a grain moisture meter for measuring grain moisture during drying using a grain dryer for drying grains, a grain is supplied one by one at predetermined time intervals. The grains are pinched and crushed one by one between the detection rolls, and the voltage waveform of the crushed grains is detected, and the maximum voltage value of the detected voltage waveform is replaced with the moisture of the grains to detect the grains. The main configuration was the moisture value.

[0003]

When the grains are pinched and pulverized between the detection rolls, the detected voltage waveform changes variously depending on the posture in which the grains are supplied between the detection rolls. In some cases, accurate detection of grain moisture cannot be performed, but the present invention is intended to solve this problem.

[0004]

For this purpose, the present invention is directed to a high-frequency wave included in a waveform of a voltage V1 detected from the crushed grain by being pressed and crushed between the detection rolls 33, 33 after receiving the supply of the grain. A voltage V2 waveform after removing the noise voltage VA, and a voltage V3 obtained by delaying the voltage V2 waveform by a predetermined time.
And a control unit (30) for comparing the voltage V2 waveform and the voltage VB value at the intersection position where the voltage V2 waveform intersects the voltage V3 waveform with the detected moisture value of the kernel. The configuration of the moisture measurement control device of the moisture meter is adopted.

[0005]

According to the grain moisture meter used in the grain dryer for drying the grains, the grains being dried by the dryer are supplied with the grains one by one at predetermined time intervals and detected. Roll 3
The grains are pinched and pulverized one by one between 3, 33, and the voltage V1 waveform of the pulverized grains is detected.
The high-frequency noise voltage VA included in the waveform is removed, and the removed voltage V2 waveform is compared with a voltage V3 waveform obtained by delaying the voltage V2 waveform for a predetermined time, and the voltage V2 waveform intersects the voltage V3 waveform. The controller 30 detects the voltage VB value at the intersection position where the intersection occurs, and the controller 30 replaces the voltage VB value with the grain moisture value, and detects the grain moisture value.

[0006]

The voltage V2 waveform is compared with the voltage V3 waveform, and the voltage VB value at the position where the voltage V2 waveform intersects the voltage V3 waveform is detected. Since the voltage V2 waveform to be detected can be accurately detected, the fluctuation of the measured value is reduced, and accurate grain moisture can be obtained.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. The figure shows a circulation type grain dryer 1 for drying grains.
Shows a state in which a grain moisture measuring device 2 for detecting grain moisture and a burner 3 for generating hot air are attached to
The moisture measuring device 2 will be described in a mounted state.

The dryer 1 is provided with a transfer trough 5 having a transfer spiral rotatably mounted therein and a ceiling plate 6 above the machine wall 4 in a rectangular shape long in the front-rear direction. A grain storage chamber 7 for storing grains is formed. The grain drying chambers 8 and 8 are provided below the storage chamber 7 between the left and right exhaust chambers 9 and 9 and the center air blowing chamber 10. Discharge valve 1 for dispensing
1 are rotatably supported respectively.

The grain collecting gutter 12 rotatably supports a transfer spiral, and is provided below each of the drying chambers 8 and 8 so as to communicate with each other. The burner 3 is provided inside a burner case 13, and the burner case 13 is detachably provided on an outer surface of the front machine wall 4 in front of the front machine wall 4 so as to correspond to an inlet side of the blower chamber 10. A dryer 1, a moisture meter 2, and the burner 3;
An operating device 14 for starting and stopping the work for each of the work of inserting, drying, and discharging is detachably provided on the outer surface of the front machine wall 4.

An exhaust fan 15 is provided on a rear exhaust wall 17, which is provided in the rear exhaust wall 9, and communicates with the left and right exhaust chambers 9, 9. 4 has this exhaust fan 1
5 is provided. The valve motor 19 drives the delivery valves 11 and 11 to rotate via a speed reduction mechanism.

The fuel pump 20 has a fuel valve,
The fuel pump 20 sucks the fuel in the fuel tank 21 and supplies the fuel to the burner 3 by opening and closing the fuel valve. Blower 22
Is provided on the outer side of the upper plate, is driven to rotate at a variable speed by a blower motor 23 for speed change, and blows combustion air corresponding to the supplied fuel amount to the burner 3 by the blower 22. Burner 3
The hot air generated from the air and the outside air passing through the burner case 13 are mixed to form dry hot air.

The diffusion board 24 is provided at the center in the front-rear direction of the bottom plate of the transfer gutter 5 and below the supply port for supplying the transfer kernels to the storage room 7, and the diffusion kernels are uniformly diffused and reduced to the storage room 7. ing.
The grain raising machine 25 is provided on the outer side of the front side machine wall 4 and has a belt with a bucket conveyor 26 stretched inside. The upper end is provided with a discharge cylinder 27 between the starter of the transfer gutter 5. The lower end portion is provided with a supply gutter 28 between the end portion of the grain collecting gutter 12 and communicates therewith.

The grain raising machine motor 29 is mounted on the bucket conveyor 2.
The belt with 6, the transfer spiral in the transfer gutter 5, the diffusion board 24, the transfer spiral in the grain collecting gutter 12, and the like are rotationally driven. The moisture measuring device 2 is provided substantially at the center of the grain raising machine 25 in the vertical direction, and the moisture measuring device 2 is provided by transmitting an electrical measurement signal at predetermined time intervals from a control device 30 provided in the operating device 14. Then, the moisture motor 31 is rotated, and the feeding roll 32, the detection rolls 33, 33, etc. of the moisture measuring device 2 are driven to rotate, and the grains falling during transport to the upper part by the bucket conveyor 26 are guided by the guide plate 34 and the guide plate 34. It is received by the feeding roller 32, and is transferred one by one by the transfer groove 35 of the feeding roller 32 and the guide plate 34, and supplied one by one to the lower detection rollers 33, 33. The grains supplied one by one between the detection rolls 33, 33 are compressed and pulverized, for example, to 32 grains, and the moisture of the 32 grains is detected, and the average moisture of the 32 detected grains is detected. The value is calculated, and these 32 grains are detected three times each. The average value of each is calculated, further, the 3
The average value of the three times is calculated, and the average grain moisture value of the three times is
The configuration is such that the grain moisture value is detected once.

In the above-described detection of the water content of each grain, as shown in FIG. 1, a voltage V1 waveform of one crushed grain is detected, and a high-frequency noise voltage VA included in the voltage V1 waveform is detected as shown in FIG. , And a voltage V2 waveform is detected. As shown in FIG. 3, the detected voltage V2 waveform is compared with a voltage V3 waveform obtained by delaying the voltage V2 waveform for a predetermined time. Has a configuration in which a voltage VB value at an intersection position intersecting with the voltage V3 waveform becomes measurement data.

The operating device 14 is a box-shaped push button for starting the drying machine 1, the moisture measuring machine 2, the burner 3 and the like on the surface plate of the box body, and for starting and drying operations respectively. Each starting means 36 of the ON-OFF switch, a stopping means 37 for stopping the operation, a moisture setting means 38 for setting a finishing target moisture of the grain by an operation position, and a temperature of hot air generated by the burner 3 by an operation position. And a display unit 41 for digitally displaying various display items, a monitor display, and the like.

The control device 30 is provided in the operating device 14 and detects a value detected by the hot air temperature sensor 42 and the like, each starting means 36, stopping means 37, and each setting means 38, 39,
An operation 40 is input, and a CPU 43 and the like which perform arithmetic and logical operations and comparison operations on these inputs.
In U43, the motors 18, 19, 23, 29, 31, the fuel valve, the fuel pump 20, and the like are started, stopped, and adjusted and controlled. The setting means 38, 39, 4
0 is a rotary switch type, and a predetermined numerical value, type, and the like are set according to the operation position.

The waveform of the detection voltage V1 of the moisture meter 2 is as follows:
After passing through the low-pass filter 44, the high-frequency noise voltage VA
Is removed to form a voltage V2 waveform, and the delay circuit 45
, A voltage V3 waveform, and the voltage V2 waveform and the voltage V3 waveform are converted into a voltage VB value through an amplifier circuit 46 and input to the CPU 43. The voltage V2 is converted by an AD converter circuit 47. The voltage input to the CPU 43 and the voltage input to the CPU 43 are replaced with one grain moisture value, and become one detected grain moisture value.
The water motor 31 is configured to start and stop.

FIG. 11 is a diagram showing control of the grain moisture measurement data. As shown in FIG. 11, it is detected whether or not the voltage V2 from which the high-frequency noise voltage VA of one crushed grain has been removed is equal to or higher than a predetermined voltage V4 value. It is detected as debris and culm cutting. If it is detected as a kernel, a first maximum voltage value VH1 and a second maximum voltage value VH2 of the voltage V2 waveform after removal of the high-frequency noise voltage VA detected in the kernel detection pulse are detected, and both of them are detected. Is detected, and the detected voltage difference VM is compared with a predetermined value set and stored in the CPU 43. When it is detected that the detected voltage difference VM is equal to or larger than the set predetermined value, the kernel It is determined that the data is detected as a result of a crushing error, and the detected data of the first and second maximum voltage values VH1 and VH2 are removed and are not used as data.

The first and second maximum voltage values VH1, VH1,
The detection of VH2 is based on the high-frequency noise voltage V
The voltage V2 waveform from which the waveform A has been removed is compared with a voltage V3 waveform obtained by delaying the voltage V2 waveform for a predetermined time.
The voltage VB value at the intersection of the voltage V2 waveform and the voltage V3 waveform may be detected, and the detected first and second voltages VB1 and VB2 may be used.

A time T1 between the first maximum voltage value VH1 and the second maximum voltage value VH2 of the detected voltage V2 waveform is detected, and the detected time T1 and a predetermined time stored and stored in the CPU 43 are stored. When the detection time T1 is detected to be within the set predetermined value, it is determined that the data is data detected due to a grain crushing error, and the detected first and second maximum voltages are detected. The data of the values VH1 and VH2 may be removed and not used as data.

As described above, when the grains are crushed into pieces when the grains are crushed, the measured voltage V1 decreases and a plurality of large peak values are generated.
The peak voltage is different, so that it is determined whether the data is valid data or not, and defective data is removed, so that highly accurate detection of grain moisture can be performed. 12 and 13
FIG. 3 is a diagram showing control of grain moisture measurement data.

As shown in FIG. 12, it is detected whether or not the voltage V2 of one crushed grain from which the high-frequency noise voltage VA has been removed is equal to or higher than a predetermined voltage V4. If there is, it is detected as straw waste, culm cutting, and the like. When it is detected that the kernel is a kernel, the voltage V2 waveform after removing the high-frequency noise voltage VA detected in the kernel detection pulse is compared with a voltage V3 waveform obtained by delaying the voltage V2 waveform for a predetermined time. Then, each voltage value at the intersection of the voltage V2 waveform and the voltage V3 waveform is detected, and the maximum value among the detected voltage values becomes the measurement data.

The waveform of the detection voltage V1 of the moisture meter 2 is as follows:
After passing through the low-pass filter 44, the high-frequency noise voltage VA
Is removed to form a voltage V2 waveform, and a voltage V3 waveform through the delay circuit 45. These voltage V2 waveform and voltage V3
The waveform is input to the amplification circuit 46, and the voltage V2 waveform and the kernel detection reference voltage V5 are input to the comparison circuit 48, and the voltage of the amplification circuit 46 and the comparison circuit 48 is
The voltage VB value is input to the CPU 50 of the control device 49. The voltage V2 is converted by the A / D conversion circuit 47 and input to the CPU 50. The voltage input to the CPU 50 is replaced with a grain water value of one grain to become a detected grain moisture value of one grain, and also controls the start and stop of the moisture motor 31.

According to the above, the grain detection pulse for distinguishing the grain from the crushed rice or culm and the maximum value during the pulse generation period become the measurement data. By using only measurement data, the measurement accuracy of the average moisture value and the standard deviation can be improved. FIG.
FIG. 15 shows a diagram for controlling the removal of the voltage fluctuation in the high frequency region of the moisture measurement voltage signal V1.

As shown in FIG. 14, the A display portion of the power spectrum of the measured waveform shows a case at about 190 Hz (T = 5 msec), and the B display shows about 440 Hz (T = 2 msec).
Shows when The measurement waveforms (original waveforms) of these A and B display sections are A1 and B1 sections. The moisture meter 2
Is passed through a low-pass filter 44 having a preset frequency characteristic, and is input to the CPU 53 of the control device 52 through the AD conversion circuit 47. The measured voltage signal V1 that has passed through the low-pass filter 44 is input to a comparison circuit 51, and the kernel detection reference voltage V5 is input to the comparison circuit 51. The voltage that has passed through the comparison circuit 51 is applied to the CPU 53. Is input to The low-pass filter 44 has a pass band of about 0 to 8.0 Hz. The voltage input to the CPU 53 is configured to be replaced with one grain moisture to become one detected grain moisture value, and to control the start and stop of the moisture motor 31.

As described above, by increasing the moisture measurement speed, the crushed grain between the detection rolls 33, 33 changes its moving speed with respect to the rotation speed of the detection rolls 33, 33. Although high-frequency noise is included, moisture measurement can be performed from a signal from which noise included in the measurement voltage signal V1 has been removed, so that data with less variation in measurement values can be obtained, and measurement accuracy can be improved. Improvement can be achieved.

FIGS. 14 and 16 show diagrams for controlling the moisture fluctuation voltage signal V1 through the smoothing circuit 54 to average the voltage fluctuation in the high frequency region. As shown in FIG.
4 shows a relationship between a power spectrum and a measured waveform. The measured voltage signal V1 of the moisture meter 2 is averaged in a high-frequency region through a smoothing circuit 54, and is input to a CPU 56 of a control device 55 through an AD conversion circuit 47. The measured voltage signal V1 that has passed through the smoothing circuit 54 is
The reference voltage V5 for grain detection is input to the comparison circuit 5
1 and passed through the comparison circuit 51,
Input to U56. The voltage input to the CPU 56 is configured to be replaced with one grain moisture to become a detected grain moisture value of one grain, and to control the start and stop of the moisture motor 31.

As described above, by increasing the moisture measurement speed, the crushed grain between the detection rolls 33, 33 changes its moving speed with respect to the rotation speed of the detection rolls 33, 33. Although high-frequency noise is included, the noise included in the measurement voltage signal V1 can be averaged, so that the variation in the measurement value is reduced, and the accuracy of moisture measurement can be improved.

[Brief description of the drawings]

 FIG. 1 shows an embodiment of the present invention.

FIG. 1 is a waveform diagram of a voltage V1 of a crushed grain.

FIG. 2 is a waveform diagram of a voltage V2 after removing a high-frequency noise voltage.

FIG. 3 is a diagram showing a voltage V2 waveform and a delay voltage V3 waveform.

FIG. 4 is a diagram showing a voltage VB value detection pulse.

FIG. 5 is an enlarged perspective view of a part of the grain moisture meter.

FIG. 6 is a partially broken whole side view of the grain dryer.

FIG. 7 is an enlarged sectional view taken along the line AA of FIG. 6;

FIG. 8 is an enlarged front view of the operating device, which can be partially broken.

FIG. 9 is a block diagram of a grain moisture meter.

FIG. 10 is a general block diagram.

FIG. 11 is a view showing another embodiment, in which a ground grain voltage waveform;
Kernel detection pulse and peak signal diagram

FIG. 12 is a diagram showing another embodiment, showing a voltage V2 waveform, a delay voltage V3 waveform, a kernel detection pulse, and a voltage VB value detection pulse diagram.

FIG. 13 is a block diagram showing another embodiment.

FIG. 14 is a diagram showing another embodiment, in which a power spectrum of a measured waveform and an original waveform diagram;

FIG. 15 is a block diagram showing another embodiment.

FIG. 16 is a block diagram showing another embodiment.

[Explanation of symbols]

REFERENCE SIGNS LIST 30 control device 33 detection roll V1 voltage waveform of ground kernel V2 voltage waveform after removal of high-frequency noise voltage V3 voltage waveform after predetermined time delay VA high-frequency noise voltage VB Voltage value of reverse position by comparing voltage V2 and voltage V3

Claims (1)

[Claims] The detection rolls 33, 3 receive the supply of grains.
The voltage V1 detected from this crushed grain by pinching and crushing between the three
The voltage V2 waveform after removing the high-frequency noise voltage VA included in the waveform is compared with a voltage V3 waveform obtained by delaying the voltage V2 waveform by a predetermined time, and the voltage V2 waveform is compared with the voltage V2.
A moisture measurement control device for a grain moisture meter, comprising: a control device 30 for controlling a voltage VB value at an intersection position intersecting three waveforms to be replaced with a detected moisture value of a grain.