A mobile grain humidity detection device

Abstract

The present invention discloses a mobile grain moisture detection device, which relates to the field of grain moisture detection. The mobile grain moisture detection device includes: a capacitor sheet, a first signal processing module, a controller, a second signal processing module and a temperature sensor; the capacitor sheet is used to collect a signal containing grain moisture, the first signal processing module is used to process the signal containing grain moisture, and send it to the controller; the temperature sensor is used to collect grain temperature signals, the second signal processing module is used to process the grain temperature signals, and send it to the controller; the controller is used to calculate the grain moisture content according to the processed signal containing grain moisture and the processed grain temperature information. Through this scheme, real-time moisture detection of grains in the harvest season is realized, and the situation of increased internal temperature and increased moisture content due to grain accumulation is avoided. It is easy to use, the measurement results are accurate, and the repeatability is good, which effectively improves the efficiency of grain measurement.

Description

Technical Field

[0001] The invention relates to the field of grain moisture detection, and in particular to a mobile grain moisture detection device. Background Art

[0002] China is a large agricultural country, and researchers have conducted a lot of research in the field of grain moisture. One of the traditional methods for measuring grain moisture is to put a certain weight of grain into a constant temperature box for heating and drying, and then calculate the moisture content of the grain. This method has high detection accuracy but a long test time, and is suitable for laboratory testing. Another method is to use fixed measurement, which increases the test speed, but for grains with high moisture content, the test data is inaccurate because the factor of air humidity in the gap between grains is ignored. The resistive humidity measurement method is either simple in structure and the measurement accuracy cannot meet the requirements, or it has high accuracy, but due to the complex operation process, it requires high costs and cannot be used on a large scale, and the scope of application is small. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a mobile grain moisture detection device in view of the deficiencies in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A mobile grain humidity detection device comprises: a capacitor, a first signal processing module, a controller, a second signal processing module and a temperature sensor;

[0006] The capacitor sheet is used to collect a signal containing grain moisture and send it to the first signal processing module;

[0007] The first signal processing module is used to process the signal containing the grain moisture and send it to the controller;

[0008] The temperature sensor is used to collect grain temperature signals and send them to the second signal processing module;

[0009] The second signal processing module is used to process the grain temperature signal and send it to the controller;

[0010] The controller is used to calculate the moisture content of the grain based on the processed signal containing the grain moisture and the processed grain temperature information.

[0011] The beneficial effects of the present invention are as follows: the present solution realizes the measurement of mobile grains in the harvest season by including a capacitor sheet, a first signal processing module, a controller, a second signal processing module and a temperature sensor. The present solution is applied to the grain silo conveyor part to realize the real-time humidity detection of grains in the harvest season, avoiding the situation where the internal temperature and humidity content increase due to grain accumulation, and eliminating the objective influence of the air humidity inside the accumulated grains. The present invention is easy to use, has accurate measurement results and good repeatability, and effectively improves the efficiency of grain measurement. The present solution can effectively avoid the influence caused by different grain volumes, masses and different life activities of grains.

[0012] This solution can measure grain moisture as needed. Grain moisture within an acceptable range will not be tested, and an alarm will be issued when the grain moisture is too high, eliminating the impact of moisture on grain quality and obtaining its absolute quality value.

[0013] Further, the first signal processing module includes: a multi-channel analog multiplexer module, a capacitive chip signal amplification module and a signal filtering module;

[0014] The capacitor sheet is connected to the multi-channel analog multiplexer module, the capacitor sheet signal amplification module, the signal filtering module and the controller in sequence.

[0015] Further, the second signal processing module specifically includes: the temperature signal amplification module and the signal filtering module;

[0016] The temperature sensor is connected to the temperature signal amplifying module, the signal filtering module and the controller in sequence.

[0017] Furthermore, it also includes: a power filter conversion module, the output of which is connected to the power interface of each module respectively;

[0018] The power filter conversion module is used to convert external input power into the power supply of the device.

[0019] Furthermore, the multi-channel analog multiplexer module includes: a CD4053 multi-channel analog multiplexer.

[0020] Furthermore, it also includes: a crystal oscillator with a frequency of 32.768KHz, and the crystal oscillator is connected to the CD4053 multi-channel analog multiplexer.

[0021] Furthermore, the capacitor sheet signal amplification module is also used for not amplifying the signal and not performing the next step of processing when the input signal collected by the capacitor sheet is less than a set value;

[0022] When the input signal collected by the capacitor is greater than the set value, the input signal is amplified.

[0023] Furthermore, the multi-channel analog multiplexer module is specifically used to receive the signal sent by the capacitor sheet, and make a charge difference with the post-processing circuit of the variable capacitor in the multi-channel analog multiplexer module to generate a comparison signal, and adjust the amplitude of the comparison signal.

[0024] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a mobile grain moisture detection device provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a humidity circuit board provided for other embodiments of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a humidity sensor provided by another embodiment of the present invention;

[0028] Figure 4 A schematic diagram of the structure of a humidity circuit board provided for another embodiment of the present invention;

[0029] Figure 5 A schematic diagram of equivalent capacitance of a capacitor sheet provided by other embodiments of the present invention;

[0030] Figure 6 A schematic diagram of a power supply voltage conversion circuit provided for other embodiments of the present invention;

[0031] Figure 7 A schematic diagram of an analog multiplexer operating circuit provided for other embodiments of the present invention;

[0032] Figure 8 This is a schematic diagram of a signal amplification circuit provided for another embodiment of the present invention.

[0033] Meaning of the reference numerals: 1. humidity circuit board; 2. capacitor sheet; 3. housing; 4. waterproof connector; 5. protective metal plate; 6. sensor cable; 110. first signal processing module; 111. controller; 112. temperature sensor; 113. second signal processing module. DETAILED DESCRIPTION

[0034] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0035] like Figure 1 As shown, a mobile grain humidity detection device provided by an embodiment of the present invention includes: a capacitor plate 2, a first signal processing module 110, a controller 111, a second signal processing module 113 and a temperature sensor 112LM335A; wherein the capacitor plate 2 is connected to the circuit board through a wire, and forms a large capacitor C by itself; when grain flows outside the shell, the external grain can be equivalent to a plate, and this plate and the sensor shell and the capacitor plate 2 close to the shell side can be equivalent to multiple capacitors C1, C2, C3, etc., and the two plates of this capacitor are the external grain equivalent plate and the capacitor plate 2 close to the shell side, wherein the intermediate medium is the shell, and the thickness of the external grain will affect the capacitance of multiple equivalent capacitors, that is, the external grain is equivalent to the capacitor plate, and the capacitor of the capacitor plate 2 forms an equivalent capacitor and a capacitor series and parallel structure of the capacitor of the capacitor plate 2, and according to the voltage division principle, the capacitor of the capacitor plate 2 will distribute the voltage in proportion; the capacitor voltage of the capacitor plate 2 changes, and the output voltage change can deduce the humidity change. Different grains (wheat, corn) have different media, which will also affect the equivalent capacitance.

[0036] The capacitor sheet 2 is used to collect a signal containing grain moisture and send it to the first signal processing module 110;

[0037] The first signal processing module 110 is used to process the signal containing the grain moisture and send it to the controller 111;

[0038] The temperature sensor 112 is used to collect grain temperature signals and send them to the second signal processing module 113;

[0039] The second signal processing module 113 is used to process the grain temperature signal and send it to the controller 111;

[0040] The controller 111 is used to calculate the moisture content of the grain according to the processed signal containing the moisture of the grain and the processed temperature information of the grain.

[0041] This solution includes a capacitor 2, a first signal processing module 110, a controller 111, a second signal processing module 113 and a temperature sensor 112LM335A, and realizes the measurement of mobile grains in the harvest season. It is applied to the grain silo conveyor part to realize the real-time humidity detection of grains in the harvest season, avoiding the situation where the internal temperature and humidity content increase due to grain accumulation, and eliminating the objective influence of the air humidity inside the accumulated grains. It is easy to use, the measurement results are accurate, and the repeatability is good, which effectively improves the efficiency of grain measurement. This solution can effectively avoid the influence caused by different grain volumes, masses, and different life activities.

[0042] Optionally, in one embodiment, the first signal processing module 110 includes: a multi-channel analog multiplexer module CD4053D, a capacitor signal amplification module and a signal filtering module; wherein the multi-channel analog multiplexer module includes: a CD4053 multi-channel analog multiplexer. wherein the structure of the capacitor signal amplification module is as follows Figure 8 As shown;

[0043] The capacitor sheet 2 is connected to the multi-channel analog multiplexer module, the capacitor sheet signal amplification module, the signal filtering module and the controller 111 in sequence.

[0044] Optionally, in a certain embodiment, the second signal processing module 113 specifically includes: the temperature signal amplification module and the signal filtering module;

[0045] The temperature sensor 112 is connected to the temperature signal amplifying module, the signal filtering module and the controller 111 in sequence.

[0046] Optionally, in a certain embodiment, it further comprises: a power filter conversion module, wherein the output of the power filter conversion module is respectively connected to the power interface of each module;

[0047] The power filter conversion module is used to convert the external input power into the power supply of the device. Figure 6 shown.

[0048] In one embodiment, a mobile grain moisture sensor, such as Figure 3 As shown, it is a capacitive humidity measuring instrument, mainly used for measuring the humidity of flowing granular grains; humidity sensors, such as Figure 4 As shown, it is composed of a detection circuit board, a housing 3 and a capacitor 2. The capacitor 2 itself is a capacitor, and one side of the capacitor 2 forms another capacitor with the food outside the housing. The intermediate medium can be equivalent to the sensor housing, such as Figure 5 As shown. A sensing copper head is provided at one end of the shell, and the other end is connected to a waterproof connector 4. A humidity circuit board 1 and a capacitor sheet 2 are placed inside the shell. The detection circuit board is powered by an external power source and exchanges information with the outside through cables. Through the special shell 3 structural design, it can be installed inside the conveying pipe and withstand the impact of grains without damage. At the same time, the capacitance method is used to achieve real-time grain humidity measurement during the harvest season, eliminating the influence of grain quality on moisture content. The humidity circuit board 1, as shown Figure 2As shown, with CD4053 multi-channel analog multiplexer as the core, the active crystal oscillator generates pulses to control the switching frequency of the multi-channel analog multiplexer so that it can detect all the time, generate three pulses, respectively connect the capacitor 2 and the variable capacitor, make charge difference in the post-processing circuit, generate comparison signals, and perform signal amplitude adjustment processing. The signal acquisition channel is composed of a voltage conversion circuit, a signal filtering and amplification circuit, an alarm circuit, a capacitor 2 structure, and a temperature sensor 112; through the structural design of the housing 3, it can measure the flowing grains. This grain moisture sensor has the remarkable characteristics of wide applicable temperature, wide application range, and low power consumption.

[0049] The frequency of the sensor crystal oscillator is 32.768KHz. The external capacitor 2 senses external changes to generate signals and has an alarm module. It is installed on the top of the grain conveying pipe to measure the humidity of the flowing grain. The humidity circuit board 1 signal is connected to four cables from the positive and negative poles, temperature signals, and humidity signals, and is connected to the housing 3 by a waterproof connector 4 and output to the data terminal.

[0050] The alarm module will sound an alarm when the moisture in the grain is too high. The alarm module is placed inside the circuit board and identifies whether the humidity signal at the front end is greater than the set threshold. If it is greater than the threshold, an alarm will be sounded.

[0051] Power supply voltage conversion circuits, such as Figure 6 As shown, it includes: one pin of the voltage regulator LM7805 U1 is connected to one end of the capacitor CP1, one end of the diode 1N5819D2, and the 12V power supply. The second pin of the voltage regulator LM7805 U1 is connected to the ground. The third pin of the voltage regulator LM7805 U1 is connected to one end of the capacitor C1. The power supply voltage is stabilized to provide a constant required voltage for the subsequent circuit.

[0052] Analog multiplexer circuits such as Figure 7 As shown, it includes: an analog multiplexer U3, whose model is CD4053D, whose first, third and thirteenth pins are connected to the external operational amplifier AD8604, the sixteenth pin is connected to the power supply and C22, the fourteenth and fifteenth pins are connected to the external capacitor sheet 2, the fourteenth pin is connected to the variable capacitor Cap VarC30 through C18, and the nineth, tenth and eleventh pins are connected to the external crystal oscillator (32.768kHZ). The CD4053 multi-channel analog multiplexer is the core component of the humidity sensor. The pulse generated by the active crystal oscillator (32.768kHZ) controls the three switching frequencies of the multi-channel analog multiplexer to make it detect all the time and generate three pulses; two switches are connected to the external capacitor sheet 2 to receive the external humidity change signal, and the other switch is connected to the variable capacitor Cap VarC30 to receive the fixed voltage signal output by the variable capacitor; the crystal oscillator (32.768kHZ) controls the CD4053 multi-channel analog multiplexer switches to be continuously opened and closed, and outputs the voltage signal to the signal amplification circuit.

[0053] Humidity signal amplifier circuit, such as Figure 8 As shown, it includes: the 9th pin of amplifier AD8604 is connected to the 13th pin of analog multiplexer circuit CD4053D U3, one end of C17, and one end of R13; the 10th pin of amplifier AD8604 is connected to the 1st pin of U3 and VR; the 2nd pin of amplifier is respectively connected to the 3rd pin of U3, one end of C12, and one end of R11; the 3rd pin of amplifier is connected to power supply VR. The humidity signal amplification circuit can preset various thresholds to filter different humidity content signals. For example, by setting a specific value, when the input signal at the front end is less than the set value, it will be ignored and humidity detection will not be performed. When the input signal at the front end is greater than the set value, the signal can be amplified to ensure the output of a smoothly changing voltage signal.

[0054] The temperature signal amplifier circuit uses the temperature sensor 1128LM335A to send out the temperature signal, which is then output to the amplifier LM321 for signal amplification.

[0055] The structure of the capacitor sheet 2 includes: the capacitor sheet 2 is connected to the circuit board through a wire, and itself forms a large capacitor C; when food flows outside the shell, the external food can be equivalent to a plate, and this plate and the sensor shell and the capacitor sheet 2 close to the shell side can be equivalent to multiple capacitors C1, C2, C3, etc., and the two plates of this capacitor are the external food equivalent plates and the capacitor sheet 2 close to the shell side, and the intermediate medium is the shell. The thickness of the external food will affect the capacitance of multiple equivalent capacitors. Thus, the equivalent capacitor and the capacitor of capacitor sheet 2 can form: equivalent capacitor C1 and C2 and C3 and C4, etc., capacitor sheet 2 capacitor C in series, when the voltage is connected, the voltage is the sum of the equivalent capacitor voltage and the capacitor sheet 2 voltage, as the external grain changes, the equivalent capacitor will change, the equivalent capacitor voltage will change, the capacitor sheet 2 capacitor voltage will change, and the output voltage will change. The external grain is equivalent to the capacitor plate, and the capacitor of capacitor sheet 2 forms an equivalent capacitor and capacitor sheet 2 capacitor series and parallel structure. According to the voltage division principle, the capacitor of capacitor sheet 2 will distribute the voltage in proportion), and the humidity change can be deduced. Different grains (wheat, corn) have different media, which will also affect the equivalent capacitance.

[0056] This solution forms a capacitor parallel and series structure with external grains through the capacitor sheet 2. The measured signal is the signal at both ends of the capacitor sheet 2. The capacitor sheet 2 transmits the signal to the humidity circuit board 1 through a wire for filtering, amplification and other processing, and sets the threshold of the grain moisture content through the grain processing module, so that the moisture content of the grain can be observed more intuitively. The humidity sensor starts to output a 0V voltage signal. When the external humidity changes, the capacitor sheet 2 reacts to generate a signal, and finally outputs a smoothly changing voltage signal through the analog multiplexer circuit and the parameter control output module end, and calculates through the grain temperature sensor 112 and the temperature processing module (although the humidity can be obtained by directly collecting the signal through the capacitor sheet 2 and processing it, the humidity content of the grain is different in the morning, noon and evening, and its humidity will also change at different temperatures. It is necessary to combine the humidity and temperature information to calculate the relative moisture content of the grain), thereby realizing the measurement of the moisture content of the liquid grain in the harvest season.

[0057] This scheme realizes the measurement of mobile grains in the harvest season through a humidity detection device including a capacitor 2, a multi-channel analog multiplexer module, a capacitor signal amplification module, a signal filtering module, a controller 111, a temperature sensor 112, a temperature signal amplification module and a power filter conversion module. It is applied to the grain silo conveyor part to realize real-time humidity detection of grains in the harvest season, avoid the situation where the internal temperature and humidity content increase due to grain accumulation, and eliminate the objective influence of the air humidity inside the accumulated grains. It is easy to use, the measurement results are accurate, and the repeatability is good, which effectively improves the efficiency of grain measurement. This scheme can effectively avoid the influence caused by different grain volumes, masses, and different life activities of grains.

[0058] This solution can measure grain moisture as needed. Grain moisture within an acceptable range will not be tested, and an alarm will be issued when the grain moisture is too high, eliminating the impact of moisture on grain quality and obtaining its absolute quality value.

[0059] Preferably, in any of the above embodiments, the multi-channel analog multiplexer module comprises: a CD4053 multi-channel analog multiplexer.

[0060] Preferably, in any of the above embodiments, it further comprises: a crystal oscillator with a frequency of 32.768KHz, and the crystal oscillator is connected to the CD4053 multi-channel analog multiplexer.

[0061] Preferably, in any of the above embodiments, the capacitor sheet signal amplification module is further used for not amplifying the signal and not performing the next step of processing when the input signal collected by the capacitor sheet 2 is less than a set value;

[0062] When the input signal collected by the capacitor 2 is greater than the set value, the input signal is amplified.

[0063] In a certain embodiment, the capacitor sheet 2 senses changes in the external humidity environment and determines whether the humidity exceeds a set threshold through a grain processing module. By setting a specific value, when the front-end input signal is less than the set value, it is ignored. When the front-end input signal is greater than the set value, the signal can be amplified, and the terminal signal gradually and smoothly increases from zero volts. In this way, diversified processing of grain dryness and wetness can be achieved, thereby realizing the measurement of the moisture content of liquid grains during the harvest season.

[0064] Preferably, in any of the above embodiments, the multi-channel analog multiplexer module is specifically used to receive the signal sent by the capacitor sheet 2, and make a charge difference with the post-processing circuit of the variable capacitor in the multi-channel analog multiplexer module to generate a comparison signal, and adjust the amplitude of the comparison signal.

[0065] The reader should understand that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0066] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the method embodiments described above are only illustrative, for example, the division of steps is only a logical function division, and there may be other division methods in actual implementation, such as multiple steps can be combined or integrated into another step, or some features can be ignored or not executed.

[0067] If the above method is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0068] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A mobile grain moisture detection device, characterized in that: include: Humidity circuit board, housing, capacitor sheet, first signal processing module, controller, second signal processing module and temperature sensor; The humidity circuit board and the capacitor sheet are located in the housing, the humidity circuit board is connected to the capacitor sheet, a capacitor sheet capacitance is formed between the humidity circuit board and the capacitor sheet, and when there is flowing grain in the shell of the housing, an equivalent capacitance is formed between the capacitor sheet and the grain layer; based on the equivalent capacitance, the capacitor sheet is used to collect a signal containing the grain humidity of the grain layer and send it to the first signal processing module; The first signal processing module is used to process the signal containing the grain moisture and send it to the controller; The temperature sensor is used to collect grain temperature signals and send them to the second signal processing module; The second signal processing module is used to process the grain temperature signal and send it to the controller; The controller is used to calculate the moisture content of the grain based on the processed signal containing the grain moisture and the processed grain temperature information.

2. A mobile grain moisture detection device according to claim 1, characterized in that: The first signal processing module includes: a multi-channel analog multiplexer module, a capacitor signal amplification module and a signal filtering module; The capacitor sheet is connected to the multi-channel analog multiplexer module, the capacitor sheet signal amplification module, the signal filtering module and the controller in sequence.

3. A mobile grain moisture detection device according to claim 2, characterized in that: The second signal processing module specifically includes: a temperature signal amplification module and a signal filtering module; The temperature sensor is connected to the temperature signal amplifying module, the signal filtering module and the controller in sequence.

4. A mobile grain moisture detection device according to any one of claims 1 to 3, characterized in that: Also includes: A power filter conversion module, the output of which is connected to the power interface of each module respectively; The power filter conversion module is used to convert external input power into the power supply of the device.

5. The mobile grain moisture detection device according to claim 2, characterized in that: The multi-channel analog multiplexer module includes: a CD4053 multi-channel analog multiplexer.

6. A mobile grain moisture detection device according to claim 5, characterized in that: Also includes: A crystal oscillator with a frequency of 32.768 KHz is connected to the CD4053 multi-channel analog multiplexer.

7. A mobile grain moisture detection device according to claim 2 or 3, characterized in that: The capacitor signal amplification module is also used for not amplifying the signal and not performing the next step of processing when the input signal collected by the capacitor is less than a set value; When the input signal collected by the capacitor is greater than the set value, the input signal is amplified.

8. A mobile grain moisture detection device according to claim 2 or 3, characterized in that: The multi-channel analog multiplexer module is specifically used to receive the signal sent by the capacitor sheet, make a charge difference with the post-processing circuit of the variable capacitor in the multi-channel analog multiplexer module, generate a comparison signal, and adjust the amplitude of the comparison signal.

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