KR200432520Y1 - Grain moisture content measuring apparatus for paddy rice grain-dryer - Google Patents

Abstract

The present invention adopts a method of measuring capacitance to enable continuous measurement without crushing the grains stored in the dryer, and to the measurement of grain moisture due to temperature changes and salt components caused by fertilizers or pesticides. It is characterized by providing a grain moisture measuring device for a dryer that minimizes the grain moisture measurement error accordingly and increases the precision.

In addition, the present invention is a dryer grain that enables precise measurement of the overall grain moisture by a simple structure that can measure the resistance and capacitance inside the grain to measure the fine moisture and high moisture contained in the grain It is to provide a moisture measuring device.

In addition, the present invention improves the economics of the farmers using the dryer by the universality of the detachable measuring device regardless of the type of dryer, and for the dryer to maximize the practical use reliability and satisfaction for the dryer used by attaching To provide a grain moisture measuring device.

Dryer, Grain, Measurement, Measurement, Capacitance, Salt Content, Moisture, High Frequency, Emitter

Description

Grain moisture measuring device for dryer {GRAIN MOISTURE CONTENT MEASURING APPARATUS FOR PADDY RICE GRAIN-DRYER}

1 is a block diagram showing to explain the present invention,

2 is a circuit diagram showing a specific embodiment according to the present invention,

Figure 3 is an exemplary view showing the external configuration of the grain moisture measuring apparatus carried out by the present invention,

Figure 4 is a graph showing the test results of measuring the grain moisture using the grain moisture measuring apparatus according to the present invention,

Figure 5 is a graph showing the results of the performance test after attaching the grain moisture measurement apparatus according to the present invention to the circulation dryer.

<Description of the code | symbol about the principal part of drawing>

10: power supply unit 11: conversion unit

12: constant voltage unit 13: high frequency cut filter unit

20: oscillator 21: frequency generator

22: LC resonance 23: amplification block

24: high frequency amplification stage 25: temperature compensation stage

30: high frequency attenuation part 40: impedance matching transformer part

50: ring bridge impedance conversion unit 51: ring bridge end

52: cable matching stage 53: high frequency stabilization stage

60: antenna 70: temperature sensor

80: high frequency DC converter 81: first DC converter

82: second DC converter 90: current amplifier

91: first current amplifier 92: second current amplifier

100: measurement moisture output unit 110: radiator

120: reflector 130: circuit portion

The present invention relates to a grain moisture measuring apparatus that can be attached to and detached from a dryer such as a circulation dryer, a general dryer, a grain storage, and can easily measure the moisture of a grain such as rice stored in the dryer. In that,

More specifically, by adopting the method of measuring the capacitance, it is possible to measure continuously without breaking the grain stored in the dryer, and the grain moisture measurement error according to the temperature change and salts caused by the fertilizer or pesticide components. The present invention relates to a grain moisture measuring device for a dryer for minimizing grain moisture measurement errors according to components to increase precision.

Recently, for the production of high quality rice and efficient drying, about 4,000 grain dryers have been supplied for an average of three years. Currently, about 60,000 grain dryers have been supplied.

The moisture measuring principle of the grain dryer is a structure that is complicated because of the electric resistance measurement method by grain crushing and is expensive, which causes the price of the dryer to rise.

In addition, the conventional grain dryer is a structure that measures the moisture by crushing after collecting a certain amount of grain of rice, the measurement error occurs depending on the degree of maturity of the rice, the presence or absence of mixing and foreign matter mixing, a certain amount (200 grain / 1 grain) Moisture is measured by collecting only grains of ash), so the representativeness of moisture measurement is somewhat ambiguous.

Thus, the above measurement method can be implemented only in the circulation type dryer and difficult to apply to other dry storage facilities, there is a problem that does not have the general versatility.

Therefore, since the grain measurement in the conventional dryer is limited in the efficiency of precise measurement, the drying of the grain is not uniform in overall, and the quality of the grain stored in the dryer is not excellent and the dryer is used. There is always a problem that the economical efficiency of the farmers to fall, thereby minimizing the reliability and satisfaction of the practical use by the dryer.

The present invention was created to solve all the problems of the prior art as described above has the following object.

The present invention adopts a method of measuring capacitance to enable continuous measurement without crushing the grains stored in the dryer, and to the measurement of grain moisture due to temperature changes and salt components caused by fertilizers or pesticides. It is an object of the present invention to provide a grain moisture measuring device for dry field to increase the precision by minimizing the grain moisture measurement error.

Another object of the present invention is a dryer for precise measurement of the overall grain moisture by a simple structure that can measure the resistance and capacitance in the grain to measure the fine moisture and high moisture contained in the grain To provide a grain moisture measuring device.

Another object of the present invention is to improve the economics of the farmers using the dryer by the universality of the detachable measuring device irrespective of the type of the dryer, and to maximize the practical reliability and satisfaction of the dryer used by attaching it. It is to provide a grain moisture measuring device for the dryer.

Hereinafter, the present invention will be described in detail.

Dryer grain moisture measuring device for measuring the moisture content of the grain stored in the dryer of the present invention for achieving the above objects, by a power supply for stably applying the power supplied from the outside, by the power applied from the power supply An oscillator for generating a high frequency, an antenna unit for radiating the high frequency generated by the oscillator to the grain and echoes the high frequency changed in accordance with the amount of water in the grain, and converts the standing wave reflected by the antenna unit into a standing wave ratio A high frequency DC converter for detecting current converted into current and impedance, a current amplifier for amplifying the DC current detected by the high frequency DC converter, and a current received from the current amplifier Reflects the characteristics of the grain, converts it to moisture or salt values, A measurement result outputting a salt value and a standing wave ratio and impedance conversion are simultaneously detected so as to detect a high frequency reflected by the antenna unit, and output a stable signal to the high frequency DC converter to shorten the antenna. Comprising a ring bridge impedance conversion unit to compensate for the frequency to the antenna itself to compensate for the feature.

The apparatus further includes a high frequency cut-off filter unit positioned between the power supply unit and the oscillation unit, and configured to block high frequencies fed back from the oscillation unit to the power supply unit.

The apparatus further comprises a high frequency attenuator for attenuating and adjusting the high frequency output by the oscillator to maintain a constant output.

The apparatus further comprises a database for storing the respective characteristics of the grains and providing the measurement result output with the characteristics of the grains currently stored in the dryer.

The antenna unit is composed of a radiator and a reflector, wherein the radiator radiates the high frequency generated by the oscillator to have a unidirectional orientation, and the reflector minimizes the rear ratio.

The oscillator comprises: a frequency generating stage for generating a high frequency of the fundamental frequency, an LC resonance stage for resonating three times the high frequency of the fundamental frequency generated by the frequency generating stage, and a high frequency tripled by the LC resonance stage. And a high frequency amplifying stage for stabilizing the high frequency output by the amplifying body termination.

The oscillator further comprises a temperature compensation stage for maintaining a constant output by adjusting the output of the high frequency in accordance with the increase and decrease of temperature.

The ring bridge impedance converter may include a ring bridge end for simultaneously detecting a standing wave ratio and an impedance change so as to detect a return high frequency, and a cable for compensating the length of the antenna shortened to allow resonance of the antenna itself. It includes a matching stage, and a high frequency stabilization stage for removing a high frequency reflected from the antenna or a fine reflection wave to obtain a stable signal from the high frequency DC converter.

The apparatus may include a dryer control unit configured to receive a current from the current amplifier or a moisture value or a salt value from the moisture output measuring unit, and adjust a temperature or humidity of the dryer according to the input current, moisture value, or salt value. It is made to include more.

First, the present invention is a dryer for storing grains such as rice for drying, in order to precisely measure the change in high and low moisture for the grain stored in the interior of the high frequency (Ultra High Frequency) band frequency It is provided with a grain moisture measuring means to use.

Thus, the grain moisture measuring means measures the grain moisture measurement error of the high water content due to salt by the standing wave change to obtain two signals and then return by the moisture content of the grain to accurately measure the moisture according to the state of the grain. It is made to measure the fine moisture by the impedance change of the radio wave and the change of standing wave, and the grain moisture measuring means is installed at an appropriate position inside the dryer, the front center is provided with a radiator for radiating high frequency, the outside of the radiator It includes a reflector for reflecting high frequency, a circuit portion in which the entire circuit is integrated at the rear end, and a fixing portion for stably fixing to the dryer.

To this end, the grain moisture measuring device for a dryer according to the present invention is a power supply unit for stably applying the power supplied from the outside in order to precisely measure the change of high moisture in the low moisture for the grain stored in the dryer, and Oscillator for generating high frequency by the power applied from the power supply unit, High frequency attenuator for maintaining a constant output to attenuate and adjust the high frequency output by the oscillator, and to prevent the influence of the reflected wave to reach the oscillator An impedance matching transformer, a ring bridge impedance converter for detecting a high frequency output from the impedance matching transformer so as to obtain a stable signal, and a reflector and a radiator, and unidirectionally directing the high frequency transmitted from the radiator. And the reflector Antenna unit for high-gain sensing response by minimizing high frequency, and capacitance of grain changes according to temperature, temperature sensor unit to measure grain temperature to compensate moisture, and current and impedance converted to standing wave ratio A high frequency direct current conversion unit for converting the high frequency direct current to detect the converted currents, and a current amplification unit for amplifying the converted direct current so as to stably obtain the direct current output through the high frequency direct current conversion unit. It is done by.

And, the grain moisture measuring device for a dryer according to the present invention, since the high frequency generated in the oscillation portion may affect the stabilized power supply portion, and further comprises a high frequency cut-off filter portion for blocking the high frequency generated in the oscillation portion and fed back to the power supply portion. . The cut-off filter part is located between the power supply part and the oscillation part.

The oscillator comprises a frequency generating stage for generating a fundamental frequency of 50 MHz, an LC resonance stage for resonating the fundamental frequency generated by the frequency generating stage by three times, and resonating to 150 MHz, and a third multiple of the 150 MHz frequency by the LC resonance stage for 450 MHz. When amplifying the amplification unit for resonance and amplification and the 450 MHz frequency output by the amplification unit immediately emit the frequency, the frequency is converted or the output becomes unstable. It includes a temperature compensation stage for maintaining a constant output by adjusting the output according to the temperature increase and decrease.

In addition, the ring bridge impedance conversion unit has a ring bridge stage for detecting the standing wave ratio and impedance conversion at the same time to detect the return high frequency, and to compensate for the length of the antenna shortened so that the antenna itself can take resonance with frequency It consists of a cable matching stage and a high frequency stabilization stage for removing a high frequency reflected from the antenna or a small reflected wave to obtain a stable signal from the high frequency DC converter.

EXAMPLE

With reference to the accompanying drawings for a preferred embodiment for achieving the present invention will be described in detail.

First, the present invention is shown in the accompanying drawings, Figures 1 to 3, Figure 1 is a block diagram showing for explaining the present invention, Figure 2 is a circuit diagram showing a specific embodiment according to the present invention, Figure 3 shows an exemplary view showing the external configuration of the grain moisture measurement apparatus implemented by the present invention.

That is, in order to implement the present invention by means of grain moisture measurement means that can be attached to a dryer or similar grain storage using radio frequency technology, which is a high frequency between the oscillator and the antenna for oscillating high frequency pulses. The bridge impedance conversion unit is provided so that the standing wave returned from the antenna unit is directly transmitted to the current conversion circuit according to the change of the impedance of the grain moisture, and the grain moisture is calculated from the pulse change amount of the frequency to accurately measure the grain moisture in a short time. It is.

To this end, the grain moisture measuring apparatus for the present invention is implemented by a grain moisture measuring means, which is to be installed at an appropriate position inside the dryer.

At this time, the grain moisture measuring means is preferably configured so that the sensing antenna unit 60 is disposed on the front portion. In the present invention, the antenna unit 60 radiates high frequency. At this time, echo occurs in the antenna unit according to the change in impedance of grain moisture, and thus standing waves are generated. The sensing of the present invention is achieved by the standing waves generated in this way. The antenna unit 60 may be configured to include the radiator 110 and the reflector 120. The radiator 110 and the reflector 120 are located in the front portion of the grain moisture measuring means, the radiator 110 is located in the front center portion to radiate high frequency, the reflector 120 is the outside of the radiator 110 It is located at to reflect high frequency.

Then, the rear end of the grain moisture measuring means is provided with a circuit unit 130, which integrates a circuit configured to easily measure the moisture for the grain stored in the interior of the dryer, the front of the grain moisture measuring means It is fixed to the dryer by the fixing part 140 provided.

As such, the grain moisture measuring means precisely measures the change of high moisture from low moisture for the grain stored inside the dryer for storing grains such as rice for drying using a frequency of the Ultra High Frequency band. The frequency of the high frequency band is preferably performed at 450MHz. However, the present invention can also be implemented by high frequencies other than 450MHz.

In addition, the grain moisture measuring means measures the grain moisture measurement error of the high moisture content due to salts (for example, fertilizers, pesticides, etc.) by changing the standing wave to acquire two signals and then accurately determine the moisture according to the state of the grain. This is to measure the fine moisture by the change in the impedance and standing wave of the radio wave returned by the amount of moisture in the grain.

Dryer grain moisture measuring device made by the grain moisture measuring means that is carried out as described above to accurately measure the change of high moisture to low moisture for the grain stored in the dryer for storing the grain such as rice In order to supply stable power. The power supplied from the outside through the power supply unit 10 is stably applied. At this time, the power supply unit 10 and the conversion unit 11 for removing noise contained in the AC or DC supplied from the outside and converting to a stable voltage and the It is composed of a constant voltage unit 12 for stably supplying the power output from the converter (11).

The oscillator 20 receives stable power from the power supply unit 10 and generates a high frequency using the supplied power. In this case, the high frequency generated by the oscillator 20 may affect the power supply unit 10. In order to prevent such an effect, a high frequency cut-off filter unit 13 which blocks high frequency is connected between the power supply unit 10 and the oscillation unit 20.

The oscillator 20 may be configured to include a frequency generator 21, an LC resonance stage 22, an amplifier stage 23, a high frequency amplifier stage 24, and a temperature compensation stage 25. Hereinafter, the present invention will be described with an example of using a high frequency of 450 MHz, but this is only to help understanding the present invention, and the present invention is not limited to the numerical values set forth in the following description.

Accordingly, the oscillator 20 generates a fundamental frequency of 50 MHz by the frequency generator 21, and the fundamental frequency of 50 MHz generated by the frequency generator 21 is tripled by the LC resonance stage 22. It is to be resonated at 150MHz, the frequency of 150MHz tripled by the LC resonance stage 22 is tripled by the amplifier stage 23 is to be resonated and amplified at 450MHz. First, multiplying low frequencies without generating a frequency of 450 MHz to obtain a higher frequency is to obtain a more stable frequency.

In this case, when the frequency of 450 MHz multiplied by the amplifying body end 23 is immediately emitted, the frequency is converted or the output becomes unstable, so that the high frequency amplifying end 24 is performed.

On the other hand, by adjusting the output according to the temperature by the temperature compensation stage 25 to maintain a constant output, which is a high frequency output is attenuated when the temperature increases, the output is increased when the temperature is lowered using a temperature bias and TR bias It is carried out by adjusting.

The high frequency attenuator 30 maintains a constant output to attenuate and adjust the high frequency output by the oscillator 20, because a constant output must be supplied to the antenna in the sensor.

In addition, the impedance matching transformer 40 is implemented to prevent the influence of the reflected wave from reaching the oscillator 20, which is a high frequency attenuator 30 and a ring bridge impedance converter 50 when a constant output is transmitted to the antenna. This is because the high frequency output and the frequency stability may be deteriorated by the reflected wave due to the antenna sensing when the ring bridge stage 51 configured at the high frequency is not matched.

Accordingly, the ring bridge impedance conversion unit 50 is for detecting the high frequency output from the impedance matching transformer 40 so as to obtain and output a stable signal.

A portion capable of detecting the high frequency returned by the ring bridge end 51, the impedance of each is composed of 50Ω and detects the standing wave ratio and impedance conversion at the same time.

In addition, the cable matching stage 52 compensates for the shortened length of the antenna so that the antenna itself can take resonance with respect to frequency, which is a ring bridge end 51 in a circuit configuration between the antenna and the ring bridge end 51. ) Is composed of 50Ω, but the antenna itself cannot take resonance on the frequency of the sensor, so the antenna shortening is performed only by compensating for the shortened length of the antenna.

That is, given the compensation by the length of the cable,

[Equation]

L = (C / F × 1/4 × 0.67-Antenna length)

'L' is the length of the coaxial cable, 'C' is the speed of light, 'F' represents the frequency, is made by the above equation, the antenna unit 60 can minimize the reflected wave and react sensitively .

When the high frequency is reflected from the antenna unit 60 by the high frequency stabilization stage 53 or a minute reflected wave is generated, the inductive resistance of 50 Ω is combined with a suitable capacitor to remove the reflected wave, which is a high frequency DC converter 80. You can get a stable signal at.

In addition, the antenna unit 60 is composed of a radiator 110 and a reflector 120, the high frequency transmitted from the radiator 110 to have a unidirectional direction, minimize the rear ratio by the reflector 120 The high frequency sensing response is obtained.

In addition, the temperature sensor unit 70 changes the capacitance of the grain according to the temperature of the grain, thereby measuring the temperature of the grain to compensate for moisture.

Accordingly, the high frequency DC converter 80 converts a high frequency into DC, which is combined with a diode and a ring bridge circuit to detect a current converted into a standing wave ratio, and a diode and a ring bridge circuit. And a second direct current converter 82 for detecting a current converted into an impedance.

In addition, since the current amplifier 90 converts a high frequency through a diode to obtain a stable DC voltage, the current amplifier 90 may amplify the DC to obtain a stable DC current. Accordingly, the first current amplifier 91 may perform a standing wave conversion. As a detection voltage, the reaction is performed by the salt action in the high moisture, and the second current amplifier 92 measures the fine moisture and the high moisture value using the impedance conversion detection voltage.

Measuring method for executing the grain moisture measuring device for the dryer is carried out as described above is to stably apply the power supplied from the outside through the power supply unit 10, the power supply through the power supply unit 10 to the oscillation unit 20 When applied, the high frequency is generated by the oscillator 20, but at this time, the high frequency generated by the oscillator 20 to block the high frequency using the high frequency cut-off filter unit 13 so as not to affect the power supply unit 10. Will run.

Thus, in the process of generating a high frequency by the oscillator 20, the frequency generator 21 generates a fundamental frequency of 50MHz and then multiplied by the LC resonance stage 22 to resonate at 150MHz, the LC resonance stage The resonant and amplified 150 MHz frequency by the multiplier through the amplification block 23 to the 450 MHz to be resonated and amplified to 450 MHz, the conversion and the unstable output state for the 450 MHz frequency output by the amplification block (23) In order to prevent the stabilization through the high frequency amplifier stage (24).

In addition, in the process of generating the fundamental frequency of 50MHz by the frequency generator 21, the output of the high frequency is increased or decreased in accordance with the increase or decrease of the temperature, so that the output according to the temperature is adjusted through the temperature compensating end 25 to output a constant output. Will be maintained.

Accordingly, the high frequency is attenuated and adjusted through the high frequency attenuator 30 so as to maintain a constant output with respect to the high frequency output by the oscillator 20, and the impedance is not affected by the reflected wave to the oscillator 20. It is prevented through the matching transformer 40, it is executed through the ring bridge impedance conversion unit 50 to detect the high frequency output from the impedance matching transformer 40 to obtain a stable signal to output.

In the process of performing the ring bridge impedance conversion unit 50 to obtain and output the stable signal as described above, the standing wave ratio and the impedance conversion are performed by the ring bridge end 51 so as to detect the high frequency return. At the same time, the antenna itself compensates for the shortened length of the antenna by the cable matching stage 52 so as to take resonance with respect to the frequency itself, and the high frequency stabilization stage 53 when high frequency is reflected from the antenna or minute reflected waves are generated. In order to obtain a stable signal from the high frequency DC converter 80 by sequentially removing).

Then, by using the radiator 110 and the reflector 120 of the antenna unit 60 to have a unidirectional direction of the high frequency transmitted from the radiator 110, and to minimize the rear ratio through the reflector 120 to sense by high frequency The reaction is performed to obtain a high gain, and since the capacitance changes according to the temperature of the grain, the temperature of the grain is measured by the temperature sensor unit 70 to compensate for the moisture of the grain.

Also, in order to detect the current converted into the standing wave ratio and the current converted into the impedance, the high frequency DC is converted using the high frequency DC converter 80, and the DC current output through the high frequency DC converter 80 is stable. The amplified DC is converted using the current amplifier 90 so as to be obtained.

On the other hand, the grain moisture meter according to the present invention can be used not only to measure the moisture of other grains, such as barley, wheat, sorghum, crude, soybeans. Different types of grains may have different characteristics depending on their traits, and these characteristics may affect moisture determination. For example, when the present invention is applied to rice and soybeans, the actual moisture value or salt value of each of the two grains may be different even though the current values measured from the two grains are the same. Therefore, the present invention improves the accuracy of moisture measurement on grains by reflecting each grain. Strictly speaking, beans are not grains. However, since the beans can also be stored in the same way as grains such as rice, the moisture measurement for the beans can also be measured by the moisture measuring device according to the present invention.

The measurement result output unit 100 and the database 102 of FIG. 1 are used to reflect the characteristics of the grain in the moisture measurement of the grain. The database 102 stores the characteristic data of each grain. The measurement result output unit 100 receives a current from the current amplifier 90 and converts the received current value into a moisture value or a salt value corresponding thereto and outputs the current. The measurement result output unit 100 converts the current value into a moisture value or a salt value and reflects the characteristic value according to the type of grain to be measured. The measurement result output unit 100 may read a characteristic value different from the type of grain from the database 102. That is, the measurement result output unit 100 reads the characteristic value for the rice from the database 102, if the current grain to be measured moisture is set to rice, the current value received from the current amplifier 90 In converting the water value or the salt value, the characteristic value of rice read out from the database 102 is reflected. At this time, the setting of the current grain to be measured can be made by the user.

In addition, the moisture value and the salt value measured by the above-described configuration may be provided to a control unit (not shown) of a dryer in which grains are stored. The controller may adjust the temperature, humidity, and the like in the dryer according to the moisture value and salt value of the stored grain. On the other hand, the control unit may receive a current directly from the current amplifier, it may be implemented to adjust the temperature, humidity, etc. of the dryer using the input current. Of course, the temperature, humidity control of such a dryer can be carried out when the dryer is provided with a temperature or humidity control means.

As shown in Figures 4 and 5, Figure 4 is a graph showing the test results of measuring the grain moisture using the grain moisture measurement apparatus according to the present invention, Figure 5 is a grain moisture measurement apparatus according to the present invention Is a graph showing the results of the performance test after attaching to the circulating dryer, and the results of laboratory tests using the grain moisture measuring device showed that the crystal coefficient showed a precision of 0.99 or more. It can be seen that it is 0.414% or less.

Based on the above results, the grain moisture measuring device was attached to the circulating grain dryer, and the result showed that the crystal system showed an accuracy of 0.97. The deviation was 0.223% and the predicted standard error was 0.368%. It can be seen that it shows high precision.

Finally, in the configuration and implementation of the grain moisture measuring apparatus and the method using the present invention can be variously modified and can take various forms. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

As described above, the present invention has a simple structure, low price, high precision measurement and versatility, and the effect of creating a market value by reducing the price and increasing the versatility of the circulator. There is.

In addition, the present invention is capable of continuous measurement without crushing grains, and the measurement of moisture at the same time with high precision due to minimization of grain moisture measurement errors due to temperature changes and grain moisture measurement errors due to salt components derived from fertilizers or pesticides. The efficiency of the effect is improved.

In addition, the present invention has a number of effects, such as maximizing the practical use reliability and satisfaction for the dryer used by attaching a measuring device that is very convenient to use and quickly and accurately measure the moisture of the grain.

Claims (9)

In the grain moisture measuring device for a dryer for measuring the moisture content of the grain stored in the dryer, A power supply unit for stably applying power supplied from the outside; An oscillator for generating a high frequency by the power applied from the power supply; An antenna unit for radiating the high frequency generated by the oscillation unit to the grain and for echoing the changed high frequency according to the amount of water in the grain; A high frequency direct current conversion unit configured to detect a current converted into a standing wave ratio and a current converted into an impedance by directly converting a standing wave reflected by the antenna unit; A current amplifier for amplifying the DC current detected by the high frequency DC converter; A measurement result output unit which converts the current received from the current amplifier into a moisture value or a salt value by reflecting the characteristics of the grains currently stored in the dryer, and outputs the converted moisture value or salt value; And Simultaneous detection of standing wave ratio and impedance conversion to detect high frequency reflected by the antenna unit outputs a stable signal to the high frequency DC converter, and compensates for the shortened length of the antenna, thereby resonating the frequency itself. Dryer grain moisture measurement device comprising a ring bridge impedance conversion unit to take. The method of claim 1, And a high frequency cut-off filter unit positioned between the power supply unit and the oscillation unit to block high frequencies fed back from the oscillation unit to the power supply unit. The method of claim 1, Dryer grain moisture measuring device further comprises a high frequency attenuator for maintaining a constant output by attenuating and adjusting the high frequency output by the oscillator. The method of claim 1, Drying grain moisture measuring apparatus for a dryer, characterized in that further comprises a database for storing the characteristics of the grain, respectively, and provides the characteristics of the grain currently stored in the dryer to the measurement result output unit. The method of claim 1, The antenna unit is composed of a radiator and a reflector, And the radiator radiates the high frequency generated by the oscillator to have a unidirectional orientation, and the reflector minimizes the rear ratio. The method of claim 1, wherein the oscillator, A frequency generator for generating a high frequency of the fundamental frequency; An LC resonator stage for resonating by multiplying the high frequency of the fundamental frequency generated by the frequency generating stage by three times; Amplification body termination for resonating and amplifying by multiplying again the high frequency tripled by the LC resonance stage; And Drying grain moisture measuring device comprising a high frequency amplification stage for stabilizing the high frequency output by the amplification body termination. The method of claim 6, The oscillator is a grain moisture measuring device for a dryer, characterized in that further comprising a temperature compensation stage for maintaining a constant output by adjusting the output of the high frequency in accordance with the increase and decrease of temperature. The method of claim 1, wherein the ring bridge impedance conversion unit, A ring bridge stage for simultaneously detecting the standing wave ratio and the impedance conversion so as to detect the returned high frequency; A cable matching stage for compensating the length of the antenna so that the antenna itself can take resonance with respect to frequency; And Drying grain moisture measuring device for a dryer characterized in that it comprises a high frequency stabilization stage to obtain a stable signal from the high frequency DC converter by removing the high frequency reflected or fine reflected waves from the antenna. The method of claim 1, Further comprising a dryer controller for receiving a current from the current amplifier or a moisture value or salt value from the moisture output measuring unit, and adjusts the temperature or humidity of the dryer according to the received current, moisture value or salt value; Drying grain moisture measuring device, characterized in that made.

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