Grain dryness and humidity detection device of grain drying tower

Abstract

The embodiment of the utility model discloses a grain dryness and humidity detection device of a grain drying tower, and relates to the technical field of grain moisture detection. Comprising a main structural member, a top plate, a left side plate, a right side plate, a front side plate and a rear side plate; the sensor measuring bin is formed in the case and comprises a first insulating plate, a second insulating plate, a third insulating plate, a first measuring polar plate and a second measuring polar plate, the first insulating plate is vertically arranged on the inner side wall of the left side of the main structural member, the second insulating plate is vertically arranged on the inner side wall of the right side of the main structural member, and the third insulating plate is vertically arranged on the inner side wall of the right side of the main structural member; the first measuring polar plate and the second measuring polar plate are vertically arranged at an interval in the front-back direction, and the edges of the two sides of the first measuring polar plate and the second measuring polar plate are connected to the first insulating plate and the second insulating plate respectively; the circuit board is provided with a high-frequency capacitance detection unit and is electrically connected with the first measuring polar plate and the second measuring polar plate; the method is suitable for a grain dryness and humidity detection scene of the grain drying tower.

Description

Technical Field

[0001] This utility model relates to the field of moisture detection technology, and more particularly to the field of grain moisture detection technology. Background Technology

[0002] With the annual increase in national grain output and the continuous improvement of grain drying technology, harvested grain is first dried in a drying tower to a storeable moisture content before being stored. The grain drying tower and control system consist of several parts: the drying tower (containing a grain discharge device, heating fan, temperature sensor, etc.), a boiler heating device, a control cabinet, and a grain moisture meter. Harvested grain is conveyed to the drying tower by a conveyor belt. The boiler heating device burns coal to generate heat, which is then blown into the tower by the fan to dry the grain. The control cabinet drives and controls the temperature, wind speed, and air temperature of the boiler heating device, as well as the speed of the grain discharge motor inside the drying tower, to control the grain drying process. The dried grain is then conveyed to the storage facility. However, over-drying and ineffective drying are common problems in grain drying, resulting in inconsistent drying conditions, such as with corn, leading to significant processing losses and waste.

[0003] Current grain moisture measurement technologies in drying towers include some using graduated cylinder moisture meters or halogen drying moisture meters to test the moisture content of the dried grain, and others using infrared spectroscopy. Furthermore, some grain moisture measurement devices in drying towers typically place a humidity detection probe in the center of the graduated cylinder to detect the grain's dryness. With halogen drying moisture meters, the grain dried at high temperatures cannot be stored or used after measurement, resulting in waste. The installation position of the humidity detection probe is controlled by the grain discharge flow rate; the flow rate of the grain passing through the sensor's detection location varies, and this change in grain flow affects the measured value. Utility Model Content

[0004] In view of this, the present invention provides a grain moisture detection device for a grain drying tower with a specific structure, which improves measurement accuracy and production efficiency.

[0005] The utility model provides a grain humidity detection device of grain drying tower, include: case, include: main structural member, top board, left side board, right side board, front side board and rear side board, main structural member, left side board, right side board, front side board and rear side board are linked with top board respectively and form the hollow box body structure, first opening has on top board, sensor measurement bin, form in the case, include: first insulating plate, second insulating plate, third insulating plate, first measurement electrode plate and second measurement electrode plate, first insulating plate is vertically arranged on the inner side wall of the left side of main structural member, second insulating plate is vertically arranged on the inner side wall of the right side of main structural member, first measurement electrode plate and second measurement electrode plate are vertically arranged in front and back, and, both side edges of first measurement electrode plate and second measurement electrode are connected on first insulating plate and second insulating plate respectively, first measurement electrode plate, second measurement electrode plate, first insulating plate, second insulating plate and third insulating plate surround and set into grain containing cavity, the first opening of top board is set in the upper portion of grain containing cavity, circuit board is equipped with high frequency capacitance detection unit, and is electrically connected with first measurement electrode plate and second measurement electrode plate.

[0006] Optionally, the detection device further comprises a temperature sensor, the mounting end of the temperature sensor is embedded on the second insulating plate, and the detection end of the temperature sensor protrudes from the inner side wall of the second insulating plate to the center of the grain containing cavity, and the temperature sensor is electrically connected to the circuit board through a signal line.

[0007] Optionally, the first insulating plate and the second insulating plate each have a measurement electrode plate mounting groove; the first measurement electrode plate and the second measurement electrode plate are mounted in the measurement electrode plate mounting grooves of the first insulating plate and the second insulating plate; the first measurement electrode plate and the second measurement electrode plate are vertically and parallelly arranged in front and back; the third insulating plate is arranged on the inside of the top plate, the top of the first measurement electrode plate and the second measurement electrode plate is fixed on the third insulating plate, and the third insulating plate is provided with a second opening below the first opening of the top plate.

[0008] Optionally, the left side plate of the case and the first insulating plate have a first interlayer space, and the right side plate and the second insulating plate have a second interlayer space.

[0009] Optionally, the detection device further comprises a motor drive control unit, a communication unit, and a power supply unit; the motor drive control unit, the communication unit, and the power supply unit are integrated on the circuit board and arranged in the second interlayer space.

[0010] Optionally, the detection device further comprises a measuring bin bottom plate, a pushing motor and a motor support; the motor support is fixedly connected with the top of the left side surface of the main structural member in the first interlayer space; the pushing motor has a telescopic rod, and the pushing motor is hingedly connected with the motor support in the first interlayer space, and the telescopic rod is hingedly connected with the measuring bin bottom plate; and the measuring bin bottom plate is hingedly connected with the main structural member.

[0011] Optionally, the bottom of the case is provided with an aviation wiring plug.

[0012] Optionally, the detection device further comprises a monitoring terminal, which is electrically connected with the circuit board through a standard bus or a cellular network.

[0013] The grain humidity detection device of the grain drying tower is suitable for the installation scene of the drying tower; the shell structure formed by the main structural member, the top plate, the left side plate, the right side plate, the front side plate and the rear side plate reduces the vibration impact of the grain on the sensors and circuits in the detection process, and improves the structural stability; in the sensor measuring bin, the electrical connection between the first measuring electrode plate and the second measuring electrode plate and the irrelevant metal structural member is insulated by the first insulating plate, the second insulating plate and the third insulating plate; the moisture in the grain is detected by the capacitor structure formed by the first measuring electrode plate and the second measuring electrode plate and the high-frequency capacitor detection unit, and grain humidity data is generated; meanwhile, the calculated grain humidity data is compensated and corrected according to the temperature sensor data, the measurement accuracy is improved, the on-site calibration is reduced, the calibration without shutdown is realized, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0015] Figure 1 It is an opening state schematic view of the sensor measuring bin of an embodiment of the present application;

[0016] Figure 2 It is a closing state schematic view of the sensor measuring bin of an embodiment of the present application;

[0017] Figure 3 It is a left front oblique side view of the detection device of an embodiment of the present application;

[0018] Figure 4 It is a top view of the detection device of an embodiment of the present application;

[0019] Figure 5 It is the schematic view of main structural member of detection device of one embodiment of the utility model;

[0020] Figure 6 It is the right rear inclined side view of detection device of one embodiment of the utility model;

[0021] In the drawing: 1: top plate; 2: measuring electrode plate; 3: motor support; 4: push motor; 5: first insulating plate; 6: left side plate; 7: measuring bin bottom plate; 8: third insulating plate; 9: electrode plate lead; 10: circuit board; 11: temperature sensor; 12: right side plate; 13: protection plate; 14: second insulating plate; 15: aviation wiring plug; 16: main structural member; 17: front side plate; 18: rear side plate. DETAILED DESCRIPTION

[0022] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0023] It should be clear that the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0024] The utility model provides a kind of grain moisture content detection device of grain drying tower, comprising: cabinet, comprising: main structural member 16, top plate 1, left side plate 6, right side plate 12, front side plate 17 and rear side plate 18, the main structural member 16, left side plate 6, right side plate 12, front side plate 17 and rear side plate 18 are connected with the top plate 1 respectively to form the hollow box structure, the top plate 1 has first opening on it;

[0025] Sensor measuring bin, formed in the cabinet, comprising: first insulating plate 5, second insulating plate 14, third insulating plate 8, first measuring electrode plate and second measuring electrode plate, the first insulating plate 5 is vertically arranged on the inner side wall of the left side of the main structural member 16, the second insulating plate 14 is vertically arranged on the inner side wall of the right side of the main structural member 16, the first measuring electrode plate and second measuring electrode plate are arranged vertically in front and back, and the two side edges of the first measuring electrode plate and second measuring electrode are connected to the first insulating plate 5 and second insulating plate 14 respectively, the first measuring electrode plate, second measuring electrode plate, first insulating plate 5, second insulating plate 14 and third insulating plate 8 are enclosed to form grain containing cavity, the first opening of the top plate 1 is provided above the grain containing cavity;Circuit board is provided with high-frequency capacitor detection unit, and is electrically connected with the first measuring electrode plate and second measuring electrode plate.

[0026] In the embodiment, refer to Figure 5The left and right sides of the main structural member 16 are fixed structures welded on the main structural member 16; the main structural member 16, the left side plate 6, the right side plate 12, the front side plate 17, and the rear side plate 18 are connected with the top plate 1 to form a hollow box structure of the cabinet for accommodating the circuit board 10, the temperature sensor 1, the pushing motor 4, and other structures, the box structure is the main housing of the measuring device, and is designed to have the functions of shock resistance, impact resistance, dust prevention, water prevention, convenient disassembly and wiring, reduction of damage of the internal sensor and other circuits caused by grain vibration and impact, and prolongation of the life cycle of the sensor and each circuit element; the circuit board 10 is fixed on the right side structure of the main structural member 16; the top plate 1 has a first opening for the entry of grain and protection of the sensor measuring bin from damage caused by grain impact; the third insulating plate 8 is inside the box structure and has a second opening, and the second opening and the first opening jointly determine the size of the grain inlet;

[0027] The sensor measuring bin is formed in a space formed by the first insulating plate 5, the second insulating plate 14, the third insulating plate 8, the first measuring electrode plate, and the second measuring electrode plate, the first insulating plate 5 is vertically arranged on the inner side wall of the left side of the main structural member 16, the second insulating plate 14 is vertically arranged on the inner side wall of the right side of the main structural member 16, the first insulating plate 5 and the second insulating plate 14 are respectively fixed on the two side walls of the main structural member 16 by screws for fixing the first measuring electrode plate and the second measuring electrode plate; the first measuring electrode plate and the second measuring electrode plate are vertically arranged in front of and behind each other, and the two side edges of the first measuring electrode plate and the second measuring electrode plate are respectively connected to the first insulating plate 5 and the second insulating plate 14, the first measuring electrode plate, the second measuring electrode plate, the first insulating plate 5, the second insulating plate 14, and the third insulating plate 8 surround to form a grain containing cavity, and the grain containing cavity is provided above the first opening of the top plate 1; the third insulating plate 8 fixes the first measuring electrode plate and the second measuring electrode plate above the first measuring electrode plate and the second measuring electrode plate while insulating and separating the first measuring electrode plate and the second measuring electrode plate from the top plate 1; the first measuring electrode plate and the second measuring electrode plate form a capacitor structure, are electrically connected with the high-frequency capacitor detection unit through the electrode plate lead 9, and detect the moisture of the grain in the grain containing cavity to generate grain humidity data;

[0028] The circuit board 10 is of SF.HGT.Hum01 model, has a high-frequency capacitance detection unit circuit, and is electrically connected with the first and second measuring electrode plates. The high-frequency capacitance detection unit circuit cooperates with the first and second measuring electrode plates to ensure that the sensor has a large detection range, strong penetration and strong anti-interference. The high-frequency capacitance detection unit detects the moisture of the grain in the sensor measuring chamber, converts it into an electrical signal, and transmits the electrical signal to the circuit board 10 through the communication unit. The circuit board 10 is provided with a processor of STM32F103RCT6 model. The processor calculates and obtains the grain moisture data according to the electrical signal, records and stores the data, controls external devices through an input / output interface, performs data transmission and data processing calculation, optimizes the power management of the circuit board 10, and controls the voltage and current required by the external devices.

[0029] In some embodiments, the detection device further comprises a temperature sensor, the mounting end of the temperature sensor is embedded on the second insulating plate 14, and the detection end of the temperature sensor protrudes from the inner side wall of the second insulating plate 14 to the center of the grain containing cavity, and the temperature sensor is electrically connected to the circuit board 10 through a signal line.

[0030] In this embodiment, the temperature sensor 11 is fixed by bolts at the center position of the sensor measuring chamber, which can better detect the temperature of the grain and does not affect the detection of the measuring electrode plate on the grain sample. Specifically, the mounting end of the temperature sensor 11 is embedded on the second insulating plate 14, and the detection end of the temperature sensor 11 protrudes from the inner side wall of the second insulating plate 14 to the center of the grain containing cavity. The temperature sensor 11 uses a high-precision temperature sensor with fast response speed and ±0.1℃ measurement accuracy. The temperature sensor is electrically connected to the circuit board 10 through a signal line, and single-bus communication is used to measure the temperature of the grain in real time. The detected temperature value is used for temperature compensation in the calculation process of the grain moisture value, which improves the measurement accuracy, reduces the need for on-site calibration, and improves the production efficiency.

[0031] In some embodiments, the first insulating plate 5 and the second insulating plate 14 each have a measuring electrode plate mounting groove; the first measuring electrode plate and the second measuring electrode plate are mounted in the measuring electrode plate mounting grooves of the first insulating plate 5 and the second insulating plate 14; the first measuring electrode plate and the second measuring electrode plate are vertically and parallelly arranged in front of and behind each other; the inside of the top plate 1 is flatly provided with a third insulating plate 8, the top of the first measuring electrode plate and the second measuring electrode plate is fixed on the third insulating plate 8, and the third insulating plate 8 is provided with a second opening below the first opening of the top plate 1.

[0032] In the embodiment, the first insulating plate 5 and the second insulating plate 14 are provided with measuring electrode plate installation grooves; the first measuring electrode plate and the second measuring electrode plate are installed in the installation grooves of the first insulating plate 5 and the second insulating plate 14, and the first measuring electrode plate and the second measuring electrode plate are fixed and at the same time are isolated from the metal of the measuring chamber; the first measuring electrode plate and the second measuring electrode plate are vertically and horizontally arranged in parallel and are spaced apart from each other, and form a capacitive sensing electrode plate for measuring the moisture content of the grain; the first measuring electrode plate and the second measuring electrode plate are made of equal-area steel plates with good conduction effect and strong anti-interference capability, and are fixed in an insulating manner, so as to better guarantee the stability and anti-interference characteristics of the measurement and enhance the measurement stability.

[0033] The first measuring electrode plate and the second measuring electrode plate are respectively provided with electrode plate leads 9 at the two side edges, and the two electrode plates are respectively electrically connected with the electrode plate leads 9; the main structural member 16, the first insulating plate 5 and the second insulating plate 14 are provided with holes corresponding to the positions at which the electrode plate leads 9 are electrically connected and fixed on the first measuring electrode plate and the second measuring electrode plate; the first measuring electrode plate and the second measuring electrode plate each lead out an electrode plate lead 9 to pass through the inner side wall on the right side of the second insulating plate 14 and the main structural member 16 and is electrically connected with the corresponding terminal on the circuit board 10, so as to transmit the electrical signals of the two measuring electrode plates to the processor for calculation; the measuring electrode plates are fixed by the insulating plates and are connected with the circuit board 10 through the electrode plate leads 9, so as to have better anti-interference performance and enhance the stability of the measurement results.

[0034] The third insulating plate 8 is arranged in the top plate 1 in a flat manner, the top of the first measuring electrode plate and the second measuring electrode plate is fixed on the third insulating plate 8, and the third insulating plate 8 is provided with a second opening corresponding to the position below the first opening of the top plate 1, so that the grain passes through the first opening and the second opening to enter the sensor measuring chamber for detection.

[0035] In some embodiments, the left side plate 6 of the case and the first insulating plate 5 have a first interlayer space therebetween; and the right side plate 12 and the second insulating plate 14 have a second interlayer space therebetween.

[0036] In the embodiment, the left side plate 6 of the case and the first insulating plate 5 have a first interlayer space therebetween for accommodating the pushing motor, the motor support and related structures; the right side plate 12 of the case and the second insulating plate 14 have a second interlayer space therebetween for accommodating the sensor, the processor and other electronic component structures; and the protection plate 13 in the second interlayer space is a circuit board for enhancing the anti-interference performance and having the anti-impact protection function.

[0037] In some embodiments, the detection device further comprises a motor driving control unit, a communication unit and a power supply unit; the motor driving control unit, the communication unit and the power supply unit are integrated on the circuit board 10 and are arranged in the second interlayer space. In some embodiments, the detection device further comprises a motor driving control unit, a communication unit and a power supply unit; the motor driving control unit, the communication unit and the power supply unit are integrated on the circuit board 10 and are arranged in the second interlayer space.

[0038] In the embodiment, the detection device further comprises a motor drive control unit, a communication unit, and a power supply unit. The motor drive control unit, the communication unit, and the power supply unit are integrated on the same circuit board 10 as the high-frequency capacitance detection unit and other circuits and processors, and are arranged in the second interlayer space. The motor drive control unit is used to accurately control the extension and retraction of the push motor 4. The communication unit is used to transmit data signals between other external sensors, so that the processor can calculate according to the sensor data. The power supply unit is used to supply power to the sensor and the push motor 4, so that the push motor 4 and the sensor can work normally.

[0039] In some embodiments, the detection device further comprises a measuring bin bottom plate 7, a push motor 4, and a motor support 3. The motor support 3 is fixedly connected to the top of the left side of the main structural member 16 in the first interlayer space. The push motor 4 has an extension rod, and the push motor 4 is hinged to the motor support 3 in the first interlayer space. The end of the extension rod is hinged to the measuring bin bottom plate 7. The measuring bin bottom plate 7 is hinged to the main structural member 16.

[0040] In the embodiment, the detection device further comprises a measuring bin bottom plate 7, a push motor 4, and a motor support 3. The motor support 3 is fixedly connected to the top of the left side of the main structural member 16 in the first interlayer space. The push motor 4 has an extension rod, and the push motor 4 is hinged to the motor support 3 in the first interlayer space. The end of the extension rod is hinged to the measuring bin bottom plate 7. The measuring bin bottom plate 7 is hinged to the main structural member 16.

[0041] The processor controls the extension and retraction of the extension rod of the push motor 4 according to the measurement period. Through the hinged structure of the push motor 4, the motor support 3, and the measuring bottom plate 7, the rotation of the measuring bin bottom plate 7 is controlled, and then the opening and closing of the sensor measuring bin are controlled for collecting and releasing the measurement sample. During the detection process, the grain enters from the first opening at the position of the top plate 1, the measuring bin bottom plate 7 is closed regularly, and after a period of time, the grain is accumulated in the grain containing cavity in the measuring bin to a certain volume, and then the detection starts. When the detection is completed, the measuring bin is opened by the push motor 4, and the grain in the measuring bin is discharged, and then the process is repeated to form a periodic grain detection space, and stable detection of the grain is realized. The switch control of the push motor 4 changes the dynamic and unstable detection process of the measuring bin into a static and stable closed detection process, realizes automatic sampling, static measurement, and fast sample testing speed, and the measurement data can be used in time to guide production.

[0042] In some embodiments, the bottom of the case is provided with an aviation wiring plug.

[0043] In this embodiment, the bottom of the case is provided with an aviation plug 15 connected with the power supply unit, and the power supply unit is supplied with power from the external power supply of the aviation plug, and then each electrical element inside the case is powered.

[0044] In some embodiments, the detection device further comprises a monitoring terminal electrically connected to the circuit board through a standard bus or a cellular network.

[0045] In this embodiment, the detection device further comprises a monitoring terminal electrically connected to the circuit board through a standard 485 bus or a cellular network, and the data is transmitted to the processor for calculation and processing; the monitoring terminal can transmit the collected data to the server for storage, and the data can be viewed at any time on the mobile phone or computer, which facilitates quick correction and adjustment of the drying tower parameters and improves the quality of grain drying; the monitoring terminal comprises a collection unit and a control unit;

[0046] The collection unit is electrically connected to the sensors of the detection device through a standard 485 bus to transmit the data signals of the sensors; the collection unit is connected to the instrument identification device through a network cable, and an AI instrument identification model is used, specifically PP-OCRv3_rec, to identify the instrument display data such as motor speed display, drying tower wind temperature, and furnace temperature in the control room, solve the problem of manual reading, achieve the purpose of automatic, fast and accurate reading and rapid input, relieve the pressure of manual work, and improve the production efficiency; the collection unit serializes and encodes all the collected data, and transmits the collected data to the industrial computer screen through the bus protocol after encoding, and uploads the collected data to the server database;

[0047] The control unit monitors and controls the power supply of each device of the detection device in real time; the control unit coordinates and plans the signals of each peripheral device, and performs calculation and processing; the control unit has an industrial computer board and a liquid crystal screen, and performs secondary calculation and algorithm correction on the moisture measurement value of the detection device, outputs and displays a more accurate moisture measurement value, and has a built-in moisture algorithm calibration formula, such as the grain parameter calibration formula in patent CN109916968A (publication date: June 21, 2019, applicant: China Electronics Technology Group Corporation No. 38 Research Institute): MC , which automatically calculates and outputs the grain moisture value according to the measurement data; the correction and sensor calibration of the moisture measurement can be completed without stopping the machine, improving the quality of the dried grain; the control unit has an AI instrument identification model, which learns the identification data of the instruments in the control room and displays them locally; the control unit has a current detection module, which monitors and controls the power supply of the peripheral device in real time, and when the current of the peripheral device is higher than the set value, the external power supply is disconnected, the indicator light is alarmed, and when the current anomaly is restored, the system automatically restores the power supply and the indicator light state;

[0048] The sensor hardware chip includes a processor chip, a 485 communication chip, an ESD protection chip, a DC-DC power supply chip, a motor driving chip, a high-frequency capacitor detection chip and an optocoupler isolation chip, etc.; the hardware circuit has a DC-DC isolation power supply function, and provides electric energy for the processor, the circuit board 10, the temperature sensor, the high-frequency capacitor detection circuit, the 485 communication circuit and the motor driving circuit, etc.; the hardware circuit receives the sensor signal through the 485 bus interface, and can perform data filtering processing on the sensor signal; the chip selection of the sensor hardware and the hardware circuit processing guarantee the accuracy and stability of measurement.

[0049] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0050] The above describes only the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A grain moisture content detection device for a grain drying tower, characterized in that, include: The chassis includes: a main structural component, a top plate, a left side plate, a right side plate, a front side plate, and a rear side plate. The main structural component, the left side plate, the right side plate, the front side plate, and the rear side plate are respectively connected to the top plate to form a hollow box structure. The top plate has a first opening. A sensor measuring chamber, formed within the chassis, includes: a first insulating plate, a second insulating plate, a third insulating plate, a first measuring electrode plate, and a second measuring electrode plate. The first insulating plate is vertically disposed on the inner sidewall of the left side of the main structural member, and the second insulating plate is vertically disposed on the inner sidewall of the right side of the main structural member. The first measuring electrode plate and the second measuring electrode plate are arranged vertically at intervals. The two side edges of the first measuring electrode plate and the second measuring electrode plate are respectively connected to the first insulating plate and the second insulating plate. The first measuring electrode plate, the second measuring electrode plate, the first insulating plate, the second insulating plate, and the third insulating plate form a grain receiving cavity. The grain receiving cavity is provided above a first opening corresponding to the top plate. The circuit board is equipped with a high-frequency capacitance detection unit, which is electrically connected to the first measuring electrode and the second measuring electrode.

2. The grain moisture content detection device for a grain drying tower according to claim 1, characterized in that, It also includes a temperature sensor, the mounting end of which is embedded in the second insulating plate, and the detection end of which protrudes from the inner sidewall of the second insulating plate and extends toward the center of the grain receiving cavity. The temperature sensor is electrically connected to the circuit board via a signal line.

3. The grain moisture content detection device for a grain drying tower according to claim 1, characterized in that, Both the first insulating plate and the second insulating plate have measuring electrode mounting slots; the first measuring electrode and the second measuring electrode are installed in the measuring electrode mounting slots of the first insulating plate and the second insulating plate; the first measuring electrode and the second measuring electrode are arranged vertically parallel and spaced apart front and back. A third insulating plate is flatly attached to the inside of the top plate. The tops of the first measuring electrode plate and the second measuring electrode plate are fixed to the third insulating plate, and the third insulating plate has a second opening below the first opening of the top plate.

4. The grain moisture content detection device for a grain drying tower according to claim 1, characterized in that, The chassis has a first interlayer space between the left side panel and the first insulating plate; and a second interlayer space between the right side panel and the second insulating plate.

5. The grain moisture content detection device for a grain drying tower according to claim 4, characterized in that, The detection device further includes: a motor drive control unit, a communication unit, and a power supply unit; the motor drive control unit, the communication unit, the power supply unit, and the high-frequency capacitor detection unit are integrated on the circuit board and disposed in the second interlayer space.

6. The grain moisture content detection device for a grain drying tower according to claim 4, characterized in that, The detection device further includes: a measuring chamber bottom plate, a push motor, and a motor bracket; the motor bracket is fixedly connected to the top left side of the main structural member within the first interlayer space; the push motor has a telescopic rod, the push motor is hinged to the motor bracket within the first interlayer space, and the end of the telescopic rod is hinged to the measuring chamber bottom plate; the measuring chamber bottom plate is hinged to the main structural member.

7. The grain moisture content detection device for a grain drying tower according to claim 1, characterized in that, The bottom of the chassis is equipped with an aviation connector.

8. The grain moisture content detection device for a grain drying tower according to claim 1, characterized in that, Also includes: A monitoring terminal is electrically connected to the circuit board via a standard bus or cellular network.

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