Agricultural product environment information wireless monitoring equipment

Abstract

The utility model discloses agricultural product environment information wireless monitoring equipment. The equipment comprises a shell and a monitoring circuit board, the monitoring circuit board comprises a main board, a sensor interface, a power supply module, a processing chip and a wireless communication module; the sensor interface is used for being connected with an environment sensor in an integrated or split mode. The processing chip is used for receiving monitoring data of the environment sensor, generating a monitoring report according to the monitoring data and controlling the wireless communication module to wirelessly transmit the monitoring data and the monitoring report. According to factors such as internal indexes and safety requirements of agricultural products, the environment sensor and equipment can be connected in an integrated or split manner, so that the automation degree of monitoring work is improved, and the accuracy and timeliness of data acquisition are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural product environment monitoring, in particular to a wireless monitoring device for agricultural product environment information. Background Art

[0002] As people's consumption level continues to improve, they pay more and more attention to the quality of agricultural products, which has become a key factor in market competition. By real-time monitoring and controlling environmental parameters such as oxygen concentration, temperature and humidity, it is possible to ensure that agricultural products are in the best condition during growth, storage and transportation, thereby maintaining their freshness and nutritional value. For environmental protection purposes, some agricultural products are usually preserved by low-oxygen conditioning technology, which controls the oxygen concentration in the environment in which the agricultural products are located and slows down the oxidation process of the agricultural products, thereby maintaining the freshness and quality of the agricultural products.

[0003] At present, environmental monitoring in low-oxygen conditioning agricultural product preservation technology generally involves manually using handheld detectors to detect the oxygen concentration, carbon dioxide concentration, temperature and humidity of the environment in which the agricultural products are located during the preservation process. However, this method has the following problems: (1) The monitoring personnel's quality tracking detection frequency and information sharing level are relatively low, and they cannot fully understand the situation of agricultural product storage warehouses and cannot promptly and accurately determine whether there are risks to the quality of agricultural products. (2) When using a handheld detector, the detection probe needs to be inserted into the interior of the agricultural product from the detection port. This process will cause internal and external gas exchange, which will affect the accuracy of the detection value; (3) During the nitrogen filling and oxygen reduction maintenance stage, the oxygen concentration in the warehouse cannot be monitored in real time, and the safety of the operators cannot be guaranteed.

[0004] Therefore, it is necessary to propose a wireless monitoring device for agricultural product environmental information, which can automatically and accurately monitor the environmental parameters inside agricultural products or between agricultural product storage warehouses in real time according to different application requirements, and upload the data in time to reduce labor costs, ensure the accuracy and timeliness of data collection, and collect and analyze the environmental parameters of agricultural products to determine whether there are abnormalities or risks in product quality and make targeted response plans. Utility Model Content

[0005] The utility model provides a wireless monitoring device for agricultural product environmental information, which is used to solve the technical problems in the prior art that environmental monitoring in low-oxygen conditioning agricultural product preservation technology usually uses a handheld detector, which causes internal and external gas exchange, low accuracy of monitoring data, and a risk of suffocation for workers in nitrogen-filled warehouses.

[0006] In order to solve the above problems, the utility model provides a wireless monitoring device for agricultural product environmental information, including a housing, and a monitoring circuit board arranged inside the housing;

[0007] The monitoring circuit board includes a main board and a sensor interface, a power module, a processing chip and a wireless communication module arranged on the main board; the sensor interface and the wireless communication module are both connected to the processing chip; the power module supplies power to the wireless communication module, the processing chip and the sensor interface; the sensor interface is used to be connected to the environmental sensor in an integrated or split manner, wherein the environmental sensor includes an oxygen concentration sensor and a temperature and humidity sensor;

[0008] The processing chip is used to receive monitoring data from environmental sensors, generate monitoring reports based on the monitoring data, and control the wireless communication module to wirelessly transmit the monitoring data and monitoring reports.

[0009] Furthermore, the housing includes a surface shell and a bottom shell;

[0010] The front shell is divided into a control area and a screen area. The control area is located on one side of the front shell and is provided with a light guide hole, a switch button and a buzzer hole in sequence; the screen area is provided with a display screen and an outer screen glass arranged above the display screen; a plurality of positioning holes are arranged around the front shell, and fixing holes corresponding to the positions of the positioning holes are arranged around the bottom shell;

[0011] The main board of the monitoring circuit board is also provided with a buzzer, a warning light and a cable socket connected to the output pins of the processing chip; the buzzer corresponds to the position of the buzzer hole on the face shell; the warning light corresponds to the position of the light guide hole; the display screen on the face shell is connected to the cable socket through a cable.

[0012] Furthermore, the power module includes a battery, an external power interface and a power circuit;

[0013] The power supply circuit is a DC regulated power supply circuit, and a resistor and a diode are arranged between the positive output terminal of the power supply circuit and the power status detection pin of the processing chip; when powered by a battery, the current flows to the power status detection pin of the processing chip through the diode, and a low level is output, and the processing chip recognizes that it is powered by a battery through the low level; when the AC power supply is connected through the external power interface, the current flows to the power status detection pin of the processing chip through the diode, and a high level is output, and the processing chip recognizes that it is powered by the AC power through the high level.

[0014] Furthermore, the wireless communication module includes a Lora communication chip and an antenna;

[0015] The signal input and output terminals of the Lora communication chip are connected to the IO data port of the processing chip.

[0016] Furthermore, the display screen is an ink screen.

[0017] Furthermore, a sealing connection unit is provided between the face shell and the bottom shell, and the sealing connection unit includes an annular groove body provided on the bottom shell, an annular flange provided on the face shell, and a sealing sleeve, the sealing sleeve is inserted into the annular groove body, and the annular flange is inserted into the sealing sleeve.

[0018] Furthermore, the cross-section of the sealing sleeve is U-shaped, and the sealing sleeve includes two side portions and a middle portion, and the two ends of the middle portion are respectively connected to the two side portions to form an insertion cavity; the side portions abut against the side walls of the annular groove body, and the middle portion is connected to the bottom of the annular groove body, and the annular flange is inserted into the insertion cavity.

[0019] Furthermore, at least one enlarged portion arranged along the depth direction of the annular groove body is provided on the side portion, and two sides of the enlarged portion are respectively in contact with the groove wall of the annular groove body and the annular flange.

[0020] Furthermore, a guide end is provided at one end of the side portion relative to the face shell, and the guide end is provided with an inclined surface inclined relative to the plug-in cavity so as to guide the annular flange to be inserted into the plug-in cavity.

[0021] Furthermore, a screw-on component is provided between the middle portion and the bottom shell, and the screw-on component is detachably connected to the bottom shell via the middle portion.

[0022] Compared with the prior art, the beneficial effects of the utility model include: the utility model protects the internal monitoring circuit board through the shell, provides different power supply modes for the equipment through the power module of the monitoring circuit board, and forms an integrated device after the environmental sensor and the sensor interface are plugged in, which is convenient for environmental monitoring inside the agricultural products and prevents the influence of gas exchange inside and outside the agricultural products on the accuracy of the monitoring results; when the environmental sensor and the sensor interface are connected through a data line, a split device is formed, which is used to monitor the storage warehouse of agricultural products, and a monitoring report is generated according to the monitoring data through the processing chip, and the monitoring data and the monitoring report are uploaded by the wireless communication module. The utility model can measure the internal oxygen concentration and temperature and humidity inside the agricultural products, and can also be installed inside the warehouse to measure the oxygen concentration and temperature and humidity between warehouses, and one machine has multiple uses. It can not only ensure the safety of the nitrogen filling operation of the operators, but also regularly detect the oxygen concentration and temperature and humidity of the environment where the agricultural products are located, improve the safety, accuracy and timeliness of data monitoring, and can provide a data basis for guiding the nitrogen filling operation, while reducing the manual workload and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a monitoring circuit board of a wireless monitoring device for agricultural product environmental information provided by an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the device housing structure provided by an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the bottom shell structure of the device provided in the embodiment of the utility model;

[0026] Figure 4 A schematic structural diagram of another embodiment of the device detection circuit board provided by the utility model;

[0027] Figure 5 A schematic diagram of the structure of a power supply circuit provided in an embodiment of the utility model;

[0028] Figure 6 A schematic diagram of the structure of the front shell and the bottom shell provided in an embodiment of the utility model;

[0029] Figure 7 A schematic structural diagram of a sealing connection unit provided in an embodiment of the utility model;

[0030] Figure 8 A schematic structural diagram of a sealing sleeve provided in an embodiment of the utility model.

[0031] In the figure, 1-monitoring circuit board; 11-face shell; 12-bottom shell; 13-light guide hole; 14-switch button; 15-buzzer hole; 16-external screen glass; 17-display screen; 18-fixing hole; 21-mainboard; 22-sensor interface; 23-power module; 24-processing chip; 25-wireless communication module; 26-buzzer; 27-cable socket; 28-battery; 29-external power interface; 30-oxygen sensor interface; 31-temperature and humidity sensor interface; 32-Lora communication chip; 33-antenna; 40-sealed connection unit; 41-annular groove body; 42-annular flange; 43-sealing sleeve; 44-side; 45-middle part; 46-plug-in cavity; 47-expanded part; 48-guide end; 49-screw-on part. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0033] This utility model proposes a wireless monitoring device for agricultural product environmental information. Figure 1 , the agricultural product environmental information wireless monitoring device comprises a housing, and a monitoring circuit board 1 arranged inside the housing;

[0034] like Figure 1As shown, the monitoring circuit board 1 includes a main board 21 and a sensor interface 22, a power module 23, a processing chip 24 and a wireless communication module 25 arranged on the main board; the sensor interface 22 and the wireless communication module 25 are both connected to the processing chip 24; the power module 23 supplies power to the wireless communication module 25, the processing chip 24 and the sensor interface 22; the sensor interface 22 is connected to the environmental sensor in an integrated or split manner, wherein the environmental sensor includes an oxygen concentration sensor and a temperature and humidity sensor;

[0035] When the environmental sensor is plugged into the sensor interface 22, an integrated device is formed; when the environmental sensor is connected to the sensor interface 22 via a data line, a split device is formed; the processing chip 24 is used to receive the monitoring data of the environmental sensor, generate a monitoring report based on the monitoring data, and control the wireless communication module 25 to wirelessly transmit the monitoring data and the monitoring report.

[0036] The utility model protects the internal monitoring circuit board through the shell, provides different power supply modes for the equipment through the power module of the monitoring circuit board, and forms an integrated device after the environmental sensor and the sensor interface are plugged in, which is convenient for environmental monitoring inside the agricultural products and prevents the influence of gas exchange inside and outside the agricultural products on the accuracy of the monitoring results; when the environmental sensor and the sensor interface are connected through the data line, a split device is formed, which is used to monitor the agricultural product storage warehouse, and a monitoring report is generated according to the monitoring data through the processing chip, and the monitoring data and the monitoring report are uploaded by the wireless communication module. The equipment of this embodiment can measure the internal oxygen concentration and temperature and humidity inside the agricultural products, and can also be installed inside the warehouse to measure the oxygen concentration and temperature and humidity between warehouses, and one machine can be used for multiple purposes. It can not only ensure the safety of the nitrogen filling operation of the operators, but also regularly detect the oxygen concentration and temperature and humidity of the environment where the agricultural products are located, improve the safety, accuracy and timeliness of data monitoring, and can provide a data basis for guiding the nitrogen filling operation, while reducing the manual workload and improving production efficiency.

[0037] In some embodiments, see Figure 2 and Figure 3 , the housing comprises a surface shell 11 and a bottom shell 12; Figure 2 It is a schematic diagram of the structure of the shell. Figure 3 It is a schematic diagram of the structure of the bottom shell.

[0038] The front shell 11 is divided into a control area and a screen area. The control area is located on one side of the front shell and is provided with a light guide hole 13, a switch button 14 and a buzzer hole 15 in sequence; the screen area is provided with a display screen 17 and an outer screen glass 16 arranged above the display screen 17; a plurality of positioning holes are arranged around the front shell, and fixing holes corresponding to the positions of the positioning holes are arranged around the bottom shell 12;

[0039] like Figure 4As shown, the main board 21 of the monitoring circuit board 1 is also provided with a buzzer 26 connected to the output pin of the processing chip 24, a warning light (not marked in the figure) and a cable socket 27. The buzzer 26 corresponds to the position of the buzzer hole 15 on the face shell; the warning light corresponds to the position of the light guide hole 13; the display screen 17 on the face shell is connected to the cable socket 27 through a cable.

[0040] By monitoring the buzzer and warning light on the circuit board, as well as the light guide holes and buzzer holes at the corresponding positions on the face shell, the equipment has an audible and visual alarm function. When the monitored environmental data is abnormal, an audible and visual alarm can be issued to reduce the risk of suffocation for workers in the nitrogen filling chamber.

[0041] In some embodiments, see Figure 4 , the power module includes a battery 28, an external power interface 29 and a power circuit (not shown in the figure);

[0042] The power supply circuit is a DC regulated power supply circuit, and a resistor and a diode are arranged between the positive output terminal of the power supply circuit and the power status detection pin of the processing chip; when powered by a battery, the current flows to the power status detection pin of the processing chip through the diode, and a low level is output, and the processing chip recognizes that it is powered by a battery through the low level; when the AC power supply is connected through the external power interface, the current flows to the power status detection pin of the processing chip through the diode, and a high level is output, and the processing chip recognizes that it is powered by the AC power through the high level.

[0043] In a specific embodiment, the external power interface uses a Type C interface, which can be plugged in and out reversely, and there is no need to distinguish the front and back sides of the plug. It has good compatibility with existing USB devices, chargers and cables, and can support higher power output.

[0044] As a specific example, Figure 5 As shown, Figure 5 This is a schematic diagram of the power supply circuit of this device. In the figure, 5VD_USB represents the external power interface and 5VD represents battery power supply. When the external power interface is not connected and the battery is used for power supply, the transistor Q13 is turned on, the MOS tubes Q11 and Q12 are not turned on, and the operating voltage VCC is provided to the processing chip through 5VD. When the external power interface is connected, the MOS tubes Q11 and Q12 are turned on, and the operating voltage is provided to the processing chip through 5VD_USB.

[0045] In some embodiments, a pin dedicated to detecting the power status is provided through the processing chip. This pin is connected to the output signal line of the power circuit, and the power supply mode can be determined by reading the level state of the pin. When the mains is powered, the pin will be pulled high; when the power is battery powered, the pin will be pulled low. In this way, the power supply mode of the power module is identified and used in different monitoring scenarios.

[0046] In some embodiments, Figure 4 As shown, the wireless communication module includes a Lora communication chip 32 and an antenna 33;

[0047] The signal input and output ends of the Lora communication chip 32 are connected to the IO data port of the processing chip 24 .

[0048] Since the application scenario of this device requires long-distance communication, the design value of the indoor communication range is about 100 meters. Lora communication technology has the advantages of long distance and low power consumption (sleep working current <10uA), which is in line with the use scenario of this device. The Lora communication chip selected in this embodiment can provide a maximum cache of 200 temperature, humidity and oxygen collection data, and cache more than 96 hours of data (collection frequency is 0.5 hours / time).

[0049] In order to conduct a comprehensive monitoring of the tobacco curing environment, Figure 4 As shown, the device is provided with an oxygen sensor interface 30 and a temperature and humidity sensor interface 31 to comprehensively monitor the gas concentration, temperature and humidity, and evaluate the maintenance environment through multi-dimensional data.

[0050] In order to reduce the power consumption of the whole device, in some embodiments, the display screen is an ink screen.

[0051] In some embodiments, the switch button on the device cover is a multi-function switch. A long press (touch) realizes the power on / off function, and a short press (touch) realizes data update and upload, and the display screen synchronously displays the latest data.

[0052] It should be noted that the preferred application scenario of the equipment provided in this embodiment is in the process of curing tobacco raw materials. Low oxygen conditioning is a special preservation technology that controls the oxygen concentration of tobacco leaves and delays the oxidation process of tobacco leaves, thereby maintaining the freshness and quality of tobacco leaves. When low oxygen conditioning is used for curing tobacco raw materials, there are some differences in the monitoring of oxygen, temperature and humidity of tobacco piles compared with conventional agricultural product environmental monitoring:

[0053] 1. Oxygen monitoring: Oxygen monitoring of tobacco leaf stacks is usually the most critical. Tobacco leaf stacks are in a sealed low-oxygen and high-nitrogen environment, and phosphine corrosion needs to be avoided. When the oxygen content exceeds the set threshold, there is a risk of spontaneous combustion of tobacco leaves. Therefore, for the monitoring of tobacco leaf stacks, it is necessary to pay close attention to the oxygen content to ensure that it is within a safe range.

[0054] 2. Temperature monitoring: Unlike conventional agricultural products, tobacco stacks have a higher stacking density and poorer air circulation, so the risk of temperature rise is greater. Excessive temperature may cause tobacco quality to decline or cause spontaneous combustion, so it needs to be monitored and controlled more closely, and high-precision temperature sensors are required. These sensors are usually able to perform local temperature measurements to understand temperature changes in different areas.

[0055] 3. Humidity monitoring: Humidity has an important impact on the preservation of tobacco leaves. Too high humidity will promote the growth of mold and cause tobacco leaves to deteriorate. Therefore, humidity monitoring of tobacco leaf stacks needs to be more accurate and timely to maintain an appropriate humidity level and avoid excessive or low humidity.

[0056] 4. Monitoring equipment: Since tobacco stacks have high requirements for environmental parameters, monitoring equipment usually needs to be more accurate and sensitive. For example, temperature sensors need to be able to accurately measure local temperature changes, and humidity sensors need to be reliable in high humidity environments to ensure the accuracy and stability of monitoring data.

[0057] In some embodiments, Figures 6 to 8 As shown, a sealing connection unit 40 is provided between the face shell 11 and the bottom shell 12, and the sealing connection unit 40 includes an annular groove body 41, an annular flange 42 and a sealing sleeve 43. The annular groove body 41 is opened on the bottom shell, the annular flange 42 is protrudingly provided on the face shell, the sealing sleeve 43 is inserted into the annular groove body 41, and the annular flange 42 is inserted into the sealing sleeve 43. The sealing sleeve 43 can fill the gap between the annular groove body 41 and the annular flange 42, and enhance the sealing between the face shell and the bottom shell.

[0058] As a further embodiment, Figure 7 As shown, the cross-section of the sealing sleeve 43 is U-shaped. The sealing sleeve 43 includes two side portions 44 and a middle portion 45. The two ends of the middle portion 45 are respectively integrated with the two side portions 44. The two side portions 44 and the middle portion 45 enclose a plug-in cavity 46 with a notch. The side portions 44 abut against the side walls of the annular groove body 41, and the middle portion 45 is connected to the bottom of the annular groove body 41. The annular flange 42 is plugged into the plug-in cavity 46. The two side portions 44 can further enhance the sealing between the surface shell and the bottom shell.

[0059] like Figure 8As shown, at least one enlarged portion 47 is arranged along the depth direction of the annular groove body 41 on the side portion 44, and the enlarged portion 47 is annular as a whole, and the two sides of the enlarged portion 47 are respectively in contact with the groove wall of the annular groove body 41 and the annular flange 42. In the specific implementation process, two groups of enlarged portions 47 are provided, which can fill the gap between the bottom shell and the face shell from the width direction of the sealing sleeve 43 to enhance the sealing between the face shell and the bottom shell. The enlarged portion 47 is made of elastic rubber material, and after being squeezed by the annular groove body 41 and the annular flange 42, it can be elastically deformed, thereby pressing against both sides.

[0060] A guide end 48 is provided at one end of the side portion 44 opposite to the surface shell. The guide end 48 is provided with an inclined surface inclined relative to the insertion cavity 46. The inclined surface can guide the annular flange 42 to be inserted into the insertion cavity 46, thereby assisting the annular flange 42 to be correctly inserted into the insertion cavity 46.

[0061] like Figure 7 As shown, a screw-on component 49 is provided between the middle portion 45 and the bottom shell. The screw-on component 49 is specifically a screw or a bolt. The screw-on component 49 passes through the middle portion 45 and is screwed into the bottom shell, thereby achieving the connection between the middle portion 45 and the bottom shell and preventing the sealing sleeve 43 from falling out.

[0062] In the following detailed description of the monitoring method, the application of the device in the tobacco leaf maintenance scenario is taken as an example. The present utility model embodiment also provides a method for wireless monitoring of agricultural product environmental information, which is implemented by using the wireless monitoring device for agricultural product environmental information described in any of the above technical solutions, and the method includes:

[0063] Determine the power supply mode of the power module through the processing chip;

[0064] When the power module is powered by a battery, the processing chip controls the wireless communication module to transmit data at a first upload frequency; when the power module is powered by AC power, the processing chip controls the wireless communication module to transmit data at a second upload frequency.

[0065] In actual applications, when monitoring the environment inside a tobacco leaf stack, it is necessary to prevent the gas exchange caused by the probe being extended into the tobacco leaf stack and the impact on the detection value. Therefore, in this case, the environmental sensor is plugged into the sensor interface to form an integrated device, which sends the monitoring data to the host computer via wireless transmission. There is no need for manual operation or opening the detection port, which ensures the accuracy of the data and the safety of the operators.

[0066] Some tobacco warehouses have high safety management requirements, and battery-powered devices cannot be placed in tobacco stacks. In this scenario, the device can be fixed to the column next to the tobacco stack, and only the external sensor can be placed in the stack. The environmental sensor is connected to the sensor interface through a data cable to form a split device. The split device can also be used to monitor the oxygen concentration and temperature and humidity between tobacco warehouses. Therefore, this device can be used for multiple purposes, and the sensor can be replaced according to different application scenarios.

[0067] It should be noted that when the equipment is powered by batteries, in order to extend the monitoring time, the first upload frequency is usually set to once every 4 hours, which not only meets the monitoring time requirements, but also ensures that the environment inside the pile is monitored for a long enough time, allowing the equipment to meet the monitoring time requirements of the tobacco leaf maintenance environment on a single charge. When the equipment is powered by external electricity, the second upload frequency is usually set to once every minute to provide operators with more timely and effective data, which can provide a data basis for the automation of environmental detection, data visualization, and intelligent early warning of large platforms, as well as big data mining and intelligent analysis for future tobacco leaf maintenance.

[0068] In some embodiments, generating a monitoring report based on the monitoring data includes:

[0069] In the monitoring scenario, when the temperature and humidity are both within the preset standard range, a first report result is generated; when the temperature and humidity are both not within the preset standard range, a second report result is generated;

[0070] In the scenario of monitoring a tobacco warehouse, when the oxygen concentration is less than the preset oxygen threshold, the third report result is displayed.

[0071] Specifically, when monitoring the tobacco leaf pile, the oxygen concentration value is only displayed and is not used as a reference indicator for the result display. The two indicators of equipment temperature and humidity in the pile are displayed according to the conditions met, and the low evaluation results are displayed first. If both parameters are not within the set standard value range, "poor" is displayed; if both are met, "excellent" is displayed, as shown in Table 1:

[0072] Table 1 Preset values ​​of monitoring equipment in the pile

[0073] Temperature ℃ Humidity RH% result 20～32℃ 55～65 excellent ＜20；32～35 55～65 good ＞35 <55 or >65 abnormal

[0074] The temperature is not lower than 20℃ and not higher than 35℃ and the humidity is within the range of 55-65 as the preset standard range. When both temperature and humidity indicators meet the standard, the monitoring report result is "excellent environment"; when one of the temperature and humidity does not meet the standard, the monitoring report result is "good environment"; when both do not meet the standard, the monitoring report result is "abnormal environment".

[0075] It should be noted that when it is detected that the sensor is not connected, the default output is FF and the indicator is not judged.

[0076] When monitoring tobacco warehouses, oxygen is an important indicator. As shown in Table 2, when the oxygen concentration in the warehouse is lower than 19.5%, it will display "danger" and the buzzer will continue to alarm. If the oxygen concentration is greater than or equal to 19.5%, the temperature and humidity will meet the conditions and the low evaluation results will be displayed first.

[0077] Table 2 Preset values ​​of warehouse environment safety monitoring equipment

[0078] Temperature(℃) Humidity RH% Oxygen O2 result 20～32℃ 55～65 ≥19.5％ excellent ＜20；32～35 55～65 ≥19.5％ good ＞35 <55 or >65 ≥19.5％ abnormal Any value Any value ＜19.5％ Danger

[0079] It should be noted that the device data scheduled upload time and the three indicator threshold settings can be remotely modified on the system platform. When the device is dormant or offline, if the system platform issues a parameter modification instruction, the device will read the new parameter configuration and take effect after the next automatic wake-up. When the device is not dormant, the remotely configured parameters can take effect immediately or after the next data update upload.

[0080] Unlike conventional optical oxygen detectors or infrared absorption oxygen detectors, tobacco leaf maintenance scenarios require strict control of oxygen concentration, and require higher accuracy and sensitivity in oxygen concentration measurement. Therefore, the oxygen concentration sensor of this device uses an electrochemical oxygen sensor, which consists of a sensing electrode (or working electrode) and a counter electrode, with a thin layer of electrolyte between the two electrodes. The gas to be detected first passes through a small capillary sensor, then diffuses through a hydrophobic membrane, and finally reaches the electrode surface. The structural design of the sensor ensures that an appropriate amount of gas will enter and react with the sensing electrode to generate sufficient electrical signals, while preventing the electrolyte from leaking out of the sensor. The gas that diffuses into the sensor through the hydrophobic membrane undergoes oxidation / reduction reactions at the sensing electrode, and a resistor is connected between the electrodes, so that a current proportional to the oxygen concentration is generated between the cathode and the anode. By detecting this current, the oxygen concentration in the gas is reflected. After a period of time (6 months to 12 months), the electrolyte substance reacts and is consumed, the concentration becomes smaller, and the output current at the same concentration as the initial concentration also becomes smaller, so the conversion relationship needs to be re-established. Therefore, the conversion relationship between current and oxygen concentration needs to be calibrated regularly.

[0081] In some embodiments, the monitoring data of the environmental sensor is received by the processing chip, and a monitoring report is generated according to the monitoring data, including:

[0082] The processing chip obtains the calculated oxygen concentration corresponding to the measured current value based on the measured current value of the oxygen concentration sensor and the preset current-oxygen concentration conversion relationship;

[0083] When the error between the calculated oxygen concentration and the currently actually measured oxygen concentration value is greater than a preset error threshold, the current-oxygen concentration conversion relationship is updated to complete the calibration of the temperature and humidity sensor.

[0084] In practical applications, the current value is generally converted to a specific oxygen concentration using a linear conversion. In the concentration range of 0-25%, the oxygen concentration is proportional to the detection current. The conversion relationship is established by detecting the current value of 0% concentration and the current value of 25% concentration.

[0085] By comparing the difference between the current value output by the analyzer and the standard value of known concentration, corresponding corrections are made to ensure the accuracy of the measurement results. Specifically: Under the standard environment, the oxygen concentration is 20.9% and 0%, and the output current values ​​corresponding to different concentrations are determined by using gas with known oxygen concentration, so as to establish a new conversion relationship. The specific formula is:

[0086]

[0087] Where b is the current drift value, y is the output current value corresponding to the oxygen concentration, x is the oxygen concentration, and k is the conversion coefficient;

[0088]

[0089] Wherein, y1 is the current value of 0% oxygen concentration, and x1 is the oxygen concentration of 0%;

[0090]

[0091]

[0092] Here, y2 is the current value at an oxygen concentration of 20.9%, and x2 is the oxygen concentration of 20.9%.

[0093] In order to fit the corresponding relationship between current and oxygen concentration more accurately, in some embodiments, the current-oxygen concentration conversion relationship is updated, including:

[0094] The measured current values ​​of the oxygen concentration sensor at different target concentration points are counted, the oxygen concentration values ​​are segmented based on the statistical results, and the current-oxygen concentration optimization conversion relationship is obtained according to the corresponding relationship between the oxygen concentration and the current value in each segment.

[0095] Specifically, the corresponding current value intervals are counted in the respective concentration sections of 0-2%, 2%-5%, 5%-10%, 10%-15%, 15%-20%, and 20%-25%, and a more appropriate segmented conversion formula is established. After the corresponding current value is monitored, the current value is substituted into the segmented formula of the corresponding current value interval for calculation.

[0096] When the oxygen concentration is 0-2%, the current value range is y1-y2.

[0097] When the oxygen concentration is 2-5%, the current value range is y2-y3.

[0098] And so on; where k1 and k2 are the corresponding coefficients under different oxygen concentrations.

[0099] Since temperature will slightly affect the reaction speed, the temperature factor is added to the conversion algorithm for correction to make the error smaller. In some embodiments, the current-oxygen concentration conversion relationship is updated, and further includes:

[0100] A temperature correction factor is added to the current-oxygen concentration optimization conversion relationship to obtain an updated current-oxygen concentration conversion relationship.

[0101] The specific formula is:

[0102]

[0103] Among them, f(T) is the influencing factor with temperature as the variable.

[0104] Considering the actual application scenario, since Lora communication uses spread spectrum technology, the signal to be transmitted is widened to a very wide frequency band to achieve long-distance transmission. But it will also cause the problem of inter-code interference, that is, different signals will affect each other, resulting in data transmission errors. Therefore, in order to ensure the transmission efficiency and reliability of the device in different channel environments, the device can automatically adjust the transmission rate in different communication environments through adaptive bit rate adjustment. In some embodiments, the wireless communication module wirelessly transmits monitoring data and monitoring reports, and also includes:

[0105] Obtain the signal-to-noise ratio and bit error rate of the current channel through the Lora communication chip;

[0106] The processing chip selects the transmission code rate according to the signal-to-noise ratio and the bit error rate, encodes the monitoring data and the monitoring report based on the transmission code rate, and generates a coding check matrix;

[0107] The encoded monitoring data and monitoring report, as well as the coding check matrix are wirelessly transmitted through the Lora communication chip.

[0108] In some embodiments, selecting a transmission code rate according to a signal-to-noise ratio and a bit error rate, and encoding the monitoring data and the monitoring report based on the transmission code rate includes:

[0109] Determine the constraint length and the number of output bits according to the signal-to-noise ratio and the bit error rate;

[0110] The monitoring data and the monitoring report are cascade-coded using LDPC codes and convolutional codes based on the coding length and the output bit number to generate a cascade-coded data sequence.

[0111] Specifically, in scenarios where the RSSI and SNR are low, a lower code rate is selected, and the anti-interference capability and transmission distance of the device are improved by adjusting the spreading factor to ensure data reliability. Different code rates correspond to different constraint lengths and output bit numbers. A smaller constraint length means that each output bit is subject to fewer constraints from the input bits, which can reduce coding delays. In practice, first, based on the minimum acceptable bit error rate of the host computer and the signal-to-noise ratio of the current channel, the code rate range is calculated according to the Shannon-Hartley formula and the Shannon limit formula, and the maximum achievable transmission code rate is selected within the code rate range.

[0112] The coding check matrix of this embodiment is a (nk)*n matrix. By multiplying the received codeword with the check matrix, a check result vector of nk dimensions is obtained. If the check result vector is zero, it means that the received codeword has no error. By using the coding check matrix, the reliability and efficiency of data transmission can be improved.

[0113] The process of encoding data according to the selected bit rate is described in detail below through a specific method.

[0114] Assume that a monitoring data block containing oxygen concentration, temperature and humidity information monitored by an environmental sensor is to be transmitted, and each data block is 100 bytes in size. The concatenation of LDPC code and convolutional code is used to improve transmission reliability.

[0115] First, the data is segmented, and a 100-byte data block is divided into five 20-byte data sub-blocks. Each 20-byte data sub-block is encoded using an LDPC code. Assume that we choose an LDPC code with n=1024 and k=512 for encoding. After LDPC code encoding, each 20-byte sub-block is expanded into a 40-byte coded block.

[0116] Secondly, the 40-byte code blocks encoded by the LDPC code are then encoded by the convolution code. Assume that we choose a convolution code with a code rate of 1 / 2 and a constraint length of 7 for encoding. After the convolution code is encoded, each 40-byte code block is expanded into an 80-byte code sequence.

[0117] Finally, concatenation coding is performed: the 80-byte code sequence encoded by the LDPC code and the convolutional code is concatenated to obtain the final 400-byte code data sequence.

[0118] The encoded data sequence is sent to the receiving end through Lora communication. At the receiving end, decoding operation is required to restore the original data.

[0119] Specifically, when the data sub-block is convolutionally encoded, the output bit is represented by the constraint length and the weight coefficient of the output bit. For example, when the constraint length is n=3, if x k represents the kth bit in the input bit sequence, Represent the weight coefficients of the first, second, and third output bits respectively. These coefficients form a two-dimensional array called a generator matrix or coefficient matrix.

[0120] For the first output bit y1, it is only affected by the current input bit x k and the previous input bit x k-1 The influence of is expressed as:

[0121]

[0122] For the second output bit y2, it is affected by the current input bit x k and the previous input bit x k-1 and the previous input bit x k-2 The influence of is expressed as:

[0123]

[0124] In addition, the calculation of each output bit can be expressed as the sum of the products of the input bits and the weight coefficients. There needs to be a specific constraint relationship between each output bit. In this embodiment, the relationship between the output bits is: By formulating constraints between output bits, the validity of the value of the second output bit y2 can be verified under the condition that the first output bit y1 is known, thereby improving the accuracy of the data.

[0125] In some embodiments, the cascade coding method can also use the cascade of LDPC code and BCH code, and connect the output of the LDPC code encoder to the input of the BCH code encoder. The LDPC code is used as the input of the BCH code, and the output of the BCH code is used as the final encoded data. The cascade decoding at the decoding end first uses the BCH code decoder to decode the received data, and then uses the output of the BCH code as the input of the LDPC decoder for further decoding.

[0126] The utility model provides a wireless monitoring device for agricultural product environmental information, which is particularly suitable for providing different power supply modes for the device through the power module of the monitoring circuit board during the maintenance of tobacco raw materials. When the environmental sensor is plugged into the sensor interface, an integrated device is formed, which is convenient for environmental monitoring in the tobacco stack, and prevents the influence of gas exchange inside and outside the stack on the accuracy of the monitoring result; when the environmental sensor is connected to the sensor interface through a data line, a split device is formed, which is used to monitor the tobacco warehouse, and a monitoring report is generated according to the monitoring data through a processing chip, and the monitoring data and the monitoring report are uploaded through a wireless communication module. The utility model can measure the oxygen concentration and temperature and humidity in the stack inside the tobacco stack, and can also be installed inside the warehouse to measure the oxygen concentration between warehouses and the temperature and humidity between tobacco warehouses, and one machine has multiple uses. It can not only ensure the safety of the nitrogen filling operation of the operator, but also can regularly detect the oxygen concentration and temperature and humidity in the stack, improve the safety, accuracy and timeliness of data monitoring, and can provide a data basis for guiding the nitrogen filling operation, while reducing the manual workload and improving production efficiency.

[0127] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A wireless monitoring device for agricultural product environmental information, characterized in that: It includes a housing and a monitoring circuit board arranged inside the housing; The monitoring circuit board includes a main board and a sensor interface, a power module, a processing chip and a wireless communication module arranged on the main board; the sensor interface and the wireless communication module are both connected to the processing chip; the power module supplies power to the wireless communication module, the processing chip and the sensor interface; the sensor interface is used to be connected to the environmental sensor in an integrated or split manner, wherein the environmental sensor includes an oxygen concentration sensor and a temperature and humidity sensor; The processing chip is used to receive monitoring data from environmental sensors, generate monitoring reports based on the monitoring data, and control the wireless communication module to wirelessly transmit the monitoring data and monitoring reports.

2. The wireless monitoring device for agricultural product environmental information according to claim 1 is characterized in that: The housing comprises a surface shell and a bottom shell; The front shell is divided into a control area and a screen area. The control area is located on one side of the front shell and is provided with a light guide hole, a switch button and a buzzer hole in sequence; the screen area is provided with a display screen and an outer screen glass arranged above the display screen; a plurality of positioning holes are arranged around the front shell, and fixing holes corresponding to the positions of the positioning holes are arranged around the bottom shell; The main board of the monitoring circuit board is also provided with a buzzer, a warning light and a cable socket connected to the output pins of the processing chip; the buzzer corresponds to the position of the buzzer hole on the face shell; the warning light corresponds to the position of the light guide hole; the display screen on the face shell is connected to the cable socket through a cable.

3. The wireless monitoring device for agricultural product environmental information according to claim 1 is characterized in that: The power module includes a battery, an external power interface and a power circuit; The power supply circuit is a DC regulated power supply circuit, and a resistor and a diode are arranged between the positive output terminal of the power supply circuit and the power status detection pin of the processing chip; when powered by a battery, the current flows to the power status detection pin of the processing chip through the diode, and a low level is output, and the processing chip recognizes that it is powered by a battery through the low level; when the AC power supply is connected through the external power interface, the current flows to the power status detection pin of the processing chip through the diode, and a high level is output, and the processing chip recognizes that it is powered by the AC power through the high level.

4. The wireless monitoring device for agricultural product environmental information according to claim 1, characterized in that: The wireless communication module includes a Lora communication chip and an antenna; The signal input and output terminals of the Lora communication chip are connected to the IO data port of the processing chip.

5. The wireless monitoring device for agricultural product environmental information according to claim 2 is characterized in that: The display screen is an ink screen.

6. The wireless monitoring device for agricultural product environmental information according to claim 2, characterized in that: A sealing connection unit is provided between the face shell and the bottom shell, and the sealing connection unit comprises an annular groove body provided on the bottom shell, an annular flange provided on the face shell, and a sealing sleeve, wherein the sealing sleeve is inserted into the annular groove body, and the annular flange is inserted into the sealing sleeve.

7. The wireless monitoring device for agricultural product environmental information according to claim 6 is characterized in that: The cross-section of the sealing sleeve is U-shaped, and the sealing sleeve includes two side portions and a middle portion. The two ends of the middle portion are respectively connected to the two side portions to form an insertion cavity; the side portions abut against the side walls of the annular groove body, the middle portion is connected to the bottom of the annular groove body, and the annular flange is inserted into the insertion cavity.

8. The wireless monitoring device for agricultural product environmental information according to claim 7 is characterized in that: At least one enlarged portion is disposed on the side portion and arranged along the depth direction of the annular groove body, and two sides of the enlarged portion are respectively in contact with the groove wall of the annular groove body and the annular flange.

9. The wireless monitoring device for agricultural product environmental information according to claim 7, characterized in that: A guide end is provided at one end of the side portion opposite to the face shell, and the guide end is provided with an inclined surface inclined relative to the insertion cavity so as to guide the annular flange to be inserted into the insertion cavity.

10. The wireless monitoring device for agricultural product environmental information according to claim 7, characterized in that: A screw-on component is provided between the middle portion and the bottom shell, and the screw-on component is detachably connected to the bottom shell via the middle portion.

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