Coal gangue pile oxygen content and temperature monitoring device

Abstract

The utility model relates to an oxygen content and temperature monitoring device for a coal gangue pile. The device comprises a detection part and an instrument host, the detection part comprises a sample injection cavity, an oxygen content sensor, a temperature sensor, a high-temperature-resistant pipe, a control panel shell, a control panel and a pressure sensor; the oxygen content sensor and the pressure sensor are arranged in the sample injection cavity, the sample injection cavity is connected with one side of the high-temperature-resistant pipe, and the other side of the high-temperature-resistant pipe is connected with the control panel shell; the temperature sensor is arranged outside the wall of the high-temperature-resistant pipe; a control panel is fixed in the control panel shell, and the oxygen content sensor, the pressure sensor and the temperature sensor are all connected with the control panel; the control panel is connected with a data acquisition module of the instrument host. The device for monitoring the oxygen content and the temperature of the coal gangue pile is used for monitoring the internal temperature and the oxygen content of the coal gangue pile in real time and predicting the spontaneous combustion risk of the coal gangue pile by analyzing the change conditions of the temperature and the oxygen content in real time.

Description

Technical Field

[0001] This utility model relates to a coal gangue pile monitoring device, and more particularly to a coal gangue pile oxygen content and temperature monitoring device. Background Technology

[0002] Coal gangue is a waste product generated during coal mining and washing. It is a black rock with a low carbon content and harder than coal, typically accounting for 15% to 20% of the coal mined, and its annual output accounts for about one-tenth of the total coal production. Currently, with the improvement of fully mechanized mining and the large-scale utilization of coal resources, the amount of coal gangue produced is increasing year by year. In order to save land utilization, coal gangue is usually piled up into mountains. However, long-term storage and oxidation can cause the internal temperature of the coal gangue to rise sharply, leading to spontaneous combustion.

[0003] At present, the monitoring of coal gangue piles mainly involves periodic or real-time temperature monitoring. A single temperature parameter cannot accurately predict and forecast spontaneous combustion of coal gangue piles. At the same time, conventional soil oxygen content sensors cannot meet the requirements for high-temperature monitoring of coal gangue piles. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model proposes a coal gangue pile oxygen content and temperature monitoring device, which is used to monitor the internal temperature and oxygen content of the coal gangue pile in real time, and to predict the risk of spontaneous combustion of the coal gangue pile by analyzing the changes in temperature and oxygen content in real time.

[0005] The technical solution adopted by this utility model is as follows:

[0006] A device for monitoring the oxygen content and temperature of a coal gangue pile, the device comprising: a detection part and an instrument main unit;

[0007] The detection component includes: a sample injection chamber, an oxygen content sensor, a temperature sensor, a high-temperature resistant tube, a control board housing, a control board, and a pressure sensor;

[0008] The oxygen content sensor and pressure sensor are installed in the injection chamber. The injection chamber is connected to one side of the high-temperature resistant tube, and the other side of the high-temperature resistant tube is connected to the control board housing.

[0009] Temperature sensors are installed on the outside of the high-temperature resistant pipe wall;

[0010] The control board is fixed inside the control board housing, and the oxygen content sensor, pressure sensor, and temperature sensor are all connected to the control board.

[0011] The control board connects to the data acquisition module of the instrument's main unit.

[0012] The sample injection chamber is connected to one side of the high-temperature resistant tube by a thread, and the other side of the high-temperature resistant tube is connected to the control board housing by a thread.

[0013] The temperature sensor is mounted on the outside of the high-temperature resistant pipe wall via a snap-fit ​​structure.

[0014] The cables of the oxygen sensor, pressure sensor, and temperature sensor pass through the bottom of the control board housing via the first through hole and are connected to the control board.

[0015] The instrument main unit includes a main unit housing, a battery module, and a solar thin film panel; the battery module is arranged inside the upper hollow shell of the main unit housing, the data acquisition module is fixed inside the upper hollow shell of the main unit housing, and the solar thin film panel is arranged around and on the top of the upper hollow shell of the main unit housing.

[0016] The control board output cable passes through the top of the control board housing via the second via, through the lower hollow support tube of the main unit housing, and through the third via on the bottom surface of the upper hollow housing of the main unit housing to connect to the data acquisition board.

[0017] The control board includes a first microcontroller, a power control circuit, a voltage acquisition circuit, a current conversion circuit, and a power supply circuit; the microcontroller is connected to the power control circuit, the voltage acquisition circuit, and the current conversion circuit respectively.

[0018] The first microcontroller controls the power control circuit and simultaneously collects the output voltage signal from the oxygen content sensor and the output signal from the pressure sensor to calculate the percentage of oxygen content in the gas.

[0019] The power control circuit provides a constant current power supply to the oxygen content sensor.

[0020] The voltage acquisition circuit amplifies the voltage signals from the oxygen content sensor and the pressure sensor.

[0021] The current conversion circuit converts the digital signal output by the microcontroller into a 4-20mA current signal;

[0022] The data acquisition module includes a second microcontroller, a 4G module, a WIFI module, an SPI storage module, a power conversion module, a charging control circuit, a thermocouple driving circuit, and a current acquisition circuit; the second microcontroller is connected to the 4G module, the WIFI module, the SPI storage module, the thermocouple driving circuit, and the current acquisition circuit respectively; the charging control circuit is connected to the power conversion module.

[0023] The outer shell of the sample inlet chamber is designed with a large number of tiny holes, and a breathable membrane is attached to the inner wall of the sample inlet chamber to prevent coal slag particles from entering the chamber while ensuring that sample gas enters the chamber.

[0024] The main housing includes a lower hollow support tube and an upper hollow housing. The upper hollow housing is mounted on the lower hollow support tube. The upper hollow housing is rectangular in shape and has two internal layers. The lower layer holds the battery module, and the upper layer holds the data acquisition module. Solar thin film panels are installed around the upper hollow housing and on the top.

[0025] A method for monitoring oxygen content and temperature in coal gangue piles. The monitoring device stores the collected oxygen content, temperature and other data in a chip. When determining whether to issue an early warning, the microcontroller queries historical data, compares and analyzes it, and combines it with the set oxygen content and temperature early warning thresholds to make an early warning decision.

[0026] This utility model discloses a device for monitoring the oxygen content and temperature of coal gangue piles, with the following technical advantages:

[0027] 1) The monitoring device of this utility model integrates a temperature sensor and an oxygen content sensor into one unit, which increases the monitoring parameters of coal gangue piles and improves the accuracy of predicting the risk of spontaneous combustion of coal gangue piles.

[0028] 2) This utility model monitoring device integrates the solar power supply system and the data acquisition host into one unit, which simplifies the field installation work and improves the efficiency of on-site equipment installation. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Figure 1 This is a schematic diagram of the on-site monitoring of the monitoring device of this utility model.

[0031] Figure 2 This is a schematic diagram of the detection part of the monitoring device of this utility model.

[0032] Figure 3 This is a schematic diagram of the main unit structure of the monitoring device of this utility model.

[0033] Figure 4 This is a schematic diagram of the data acquisition module structure of the monitoring device of this utility model.

[0034] Figure 5 This is a schematic diagram of the control board structure of the monitoring device of this utility model.

[0035] Figure 6 A comparison of pump cycle time and Nernst voltage cycle time with oxygen partial pressure characteristics. Detailed Implementation

[0036] A device for monitoring the oxygen content and temperature of a coal gangue pile, comprising: a detection part 1 and an instrument host 2.

[0037] The detection part 1 includes a sample injection chamber 11, an oxygen content sensor 12, a temperature sensor 13, a high-temperature resistant tube 14, a control board housing 15, a control board 16, and a pressure sensor 17.

[0038] The sample inlet chamber 11 is mainly designed to ensure the monitoring accuracy and service life of the oxygen content sensor 12. The outer shell of the sample inlet chamber 11 is designed with a large number of small holes, and the inner wall is covered with a breathable membrane. This design prevents coal slag particles from entering the chamber while ensuring that sample gas enters the chamber.

[0039] The oxygen content sensor 12 is a high-temperature resistant zirconium oxide sensor, and the sensor lead is a four-core high-temperature resistant cable. Its internal heating temperature can reach up to 700℃, and it can work normally when the sample gas temperature is below 700℃.

[0040] The temperature sensor 13 uses a type K thermocouple with a maximum temperature of 1200℃. The lead wire is a two-core high-temperature shielded cable.

[0041] The high-temperature resistant tube 14 is made of 310s heat-resistant stainless steel. Both ends are designed with screw threads; one end connects to the sample injection chamber 11, and the other end connects to the control board housing 15. The sensor is installed in the drilled hole; the rigid connection facilitates installation and makes it easier to remove the sensor in case of failure without breaking the connecting cable.

[0042] The control panel housing 15 is made of stainless steel and is cylindrical in shape.

[0043] The control board 16 includes a first microcontroller 161, a power control circuit 162, a voltage acquisition circuit 163, a current conversion circuit 164, and a power supply circuit 165. Its main function is to calculate digital values ​​from the signals acquired by the oxygen content sensor 12 using the microcontroller 161, and then convert these digital values ​​into 4-20mA current signals via the current conversion circuit 164.

[0044] The first microcontroller 161 adopts an enhanced STM32F103RET6, which mainly controls the power control circuit 162 to output a square wave current signal. At the same time, the first microcontroller 161 collects the output voltage signal of the oxygen content sensor 12 and the output signal of the pressure sensor 17, and calculates the percentage of oxygen content in the gas through the internal program.

[0045] The power control circuit 162 mainly provides a constant current power supply to the oxygen content sensor 12, so that the internal pump of the sensor can work normally and generate an electrochemical suction effect.

[0046] The voltage acquisition circuit 163 mainly amplifies the Nernst voltage between the output terminals PUMP and COMMON of the oxygen content sensor 12 and the voltage signal of the pressure sensor 17.

[0047] The current conversion circuit 164 is mainly used to convert the digital signal output by the first microcontroller 161 into a 4-20mA current signal for long-distance transmission.

[0048] The pressure sensor 17 is mainly used to measure the overall pressure of the sample gas, and adopts the XTEL-100-190(M) miniature rugged high-temperature pressure sensor Kulite.

[0049] The instrument host 2 includes a host housing 21, a battery module 22, a data acquisition module 23, and a solar thin film panel 24.

[0050] The main unit housing 21 is mainly composed of a lower hollow support tube and an upper hollow housing. The lower hollow support tube and the upper hollow housing are connected and tightened by threads. The lower hollow support tube places the instrument main unit 2 at a certain height to prevent vegetation from blocking the power supply of the solar panel and to prevent animals from damaging the instrument main unit 2.

[0051] The lower hollow support tube is made of stainless steel cylindrical tubing, typically 1-2 meters in length. The upper hollow shell is rectangular in shape and has two internal layers. The lower layer houses the battery module 22, which uses lithium batteries. The lithium batteries can be selected based on the instrument's power consumption, with a maximum capacity of 12Ah. The upper layer houses the data acquisition module 23. Approximately 2.5W PET solar thin-film panels are installed around the perimeter and top of the upper hollow shell, enabling an effective surface area of ​​5W under sufficient sunlight, ensuring energy storage for the equipment. The outer shell is made of PC material, which is characterized by high strength, good elasticity, high impact resistance, and a wide temperature range. All parts of the shell are produced using injection molding.

[0052] The main unit housing 21 is designed with environmental applicability and field construction conditions in mind. The overall structure is designed to be assembled and fixed from top to bottom and from the inside to the outside, which improves the protection level of the housing, reduces the manual input for instrument installation in the field, and reduces the operation difficulty for field personnel.

[0053] The data acquisition module 23 includes a second microcontroller 231, a 4G module 232, a WIFI module 233, an SPI storage 234, a power conversion module 235, a charging control circuit 236, a thermocouple drive circuit 237, and a current acquisition circuit 238. The data acquisition module 23 primarily collects and processes data from the temperature sensor 13 and the oxygen content sensor 12. With the second microcontroller 231 as its core, the data acquisition module 23 collects the temperature value of the temperature sensor 13 through the thermocouple drive circuit 237 and collects the output signal of the control board 16 through the current acquisition circuit 238. The second microcontroller 231 processes the collected data and then sends it to the cloud platform via the 4G module 232.

[0054] The second microcontroller 231 uses an STMicroelectronics microprocessor, specifically the enhanced STM32F103RET6, based on the ARM Cortex-M3 core, achieving a performance of 1.25 DMIPS / MHz. It features a 72MHz system clock frequency, 512KB flash program memory, 64KB BSRAM, 8 timers, 3 12-bit analog-to-digital converters, 1 digital-to-analog converter, 1 CAN interface, a 7-channel DMA controller, and SPI, USART, I2C, I2S, and USB interfaces. This controller boasts rich peripherals and strong anti-interference capabilities.

[0055] The 4G module 232 uses the high-performance 4G DTU product ATK-IDM750C developed by Zhengdian Atom, supporting China Mobile 4G, China Unicom 4G, and China Telecom 4G SIM cards. Its core functions are high speed, low latency, and wireless data transmission, enabling rapid solutions for wireless data transmission in various application scenarios. It supports TCP / UDP / HTTP / MQTT / DNS / RNDIS / NTP protocols, connects to various cloud servers (such as Atom Cloud, Alibaba Cloud, Baidu Cloud, and OneNET), supports TCP / UDP / HTTP / MQTT data pass-through, supports USB wireless network cards, supports automatic timed data collection tasks, supports base station positioning, supports custom heartbeat and registration packet data, and supports configuration parameters for host computer / AT commands / SMS / pass-through commands.

[0056] The WIFI module 233 uses the ATK-ESP8266 serial WIFI module from Zhengdian Atom. The module communicates with the MCU via serial port (LVTTL) and has a built-in TCP / IP protocol stack, enabling conversion between serial port and WIFI. Its main function is for users to connect their mobile phones to the WIFI module 233 to configure parameters for the data acquisition module 23.

[0057] The SPI storage 234 uses a serial Flash memory chip W25Q64BV, which has a storage capacity of 64MB. Its main function is to store configuration parameters, which are automatically read from storage when the system loses power.

[0058] The power conversion module 235 uses a switching power supply chip TPS5430 manufactured by TI to convert the voltage of the battery module 22 to 5.8V, and then uses an LDO regulator to convert the 5.2V output voltage of TPS5430 into the 3.3V voltage required by the STM32 microcontroller and other modules. At the same time, in order to control the power supply of each module, a load switching chip TPS22810 is used to supply power to each module under the control of the STM32 microcontroller.

[0059] The charging control circuit 236 uses the BQ2465, a dedicated solar power charging management integrated circuit manufactured by TI, to automatically control and manage the charging of the lithium battery by the solar panel 24. The BQ24650 is a highly integrated switch-mode battery charging controller suitable for 5-28V solar panels. It provides input voltage regulation, reducing the charging current when the input voltage is below the programmed level. When the input is powered by the solar panel, the input regulation loop reduces the charging current, allowing the solar panel to provide maximum power output.

[0060] The thermocouple drive circuit 237 uses the MAX31856 chip, a high-precision temperature measurement chip with a measurement accuracy of ±0.15% and a cold junction accuracy of ±0.7℃ (-20℃ to +85℃). It has a built-in 19-bit analog-to-digital converter (ADC) and features thermocouple nonlinearity correction, input protection, cold junction compensation sensing, and correction functions.

[0061] The current acquisition circuit 238 uses a 100Ω sampling resistor to convert the 4-20mA current signal into a voltage signal, and then outputs it to the AD sampling port of the STM32 microcontroller 231 via a voltage follower.

[0062] The entire system is powered by a lithium battery 22. The data acquisition module 23 is designed with a solar battery intelligent charging control circuit, which, when combined with a solar thin film panel 24, enables long-term operation.

[0063] 1. Temperature monitoring methods are as follows:

[0064] Temperature sensor 13 is a type K thermocouple sensor. The working principle of a thermocouple sensor is based on the Seebeck effect, a phenomenon where an electromotive force (EMF) is generated in a circuit when two conductors of different materials are joined together and a temperature difference exists at the joint. Specifically, a thermocouple consists of two conductors of different materials (called thermoelectrodes), with one end welded together to form the working junction (also called the measuring junction), and the other end connected to the thermocouple acquisition circuit to measure the thermoelectric EMF generated by the thermocouple. By measuring this EMF, the temperature of the measured medium can be determined.

[0065] 2. Oxygen content monitoring methods are as follows:

[0066] The oxygen sensor 12 is a zirconia (ZrO2) sensor, which measures the partial pressure of oxygen in the gas, rather than the oxygen concentration.

[0067] The total pressure of an ideal gas mixture (P) total The partial pressure (P) of each gas in the mixture is equal to the partial pressure of each gas. i ) and:

[0068]

[0069] From equation (1), we can conclude that

[0070] Number of particles of a single gas component (n) i The ratio of the number of particles in the mixture to the total number of particles in the gas mixture (n) total ) equals the partial pressure of a single gas (P) i ) and total pressure of the mixed gas (P) total The proportion of ).

[0071]

[0072] At high temperatures (>650℃), stable zirconium dioxide (ZrO2) exhibits two physical mechanisms:

[0073] 1) ZrO2 partially dissociates, producing mobile oxygen ions, thus forming a solid electrolyte of oxygen. The zirconia disk is covered with a permeable electrode connected to a constant DC current, allowing oxygen ions from the environment to pass through the material, thereby releasing a certain amount of oxygen at the anode, which is proportional to the charge transferred (electrochemical pumping).

[0074] 2) ZrO2 behaves like an electrolyte. If two different oxygen pressures exist at the two ends of zirconium oxide, a voltage (Nernst voltage) will be generated through zirconium oxide.

[0075] 3: The zirconium oxide (ZrO2) sensor has a total of 5 connections:

[0076] Two heaters are connected: The heaters require a special voltage to ensure that the sensing element operates at the correct temperature.

[0077] Three sensing elements are connected: a reversible constant DC current source is connected between PUMP and COMMON to generate the electrochemical suction effect. The resulting Nernst voltage is also measured between them.

[0078] As mentioned earlier, the constant current source reverses when the sensed signal amplitude reaches predetermined reference levels (V1 and V5). The duration of a complete pump cycle—the time for evacuation and refilling of the chamber—depends on the partial pressure of oxygen in the gas being measured. This time is equivalent to the cycle time (tp) of the Nernst voltage. The higher the ambient oxygen pressure, the longer it takes for the oxygen pump at the constant pump current to reach the same pressure level. Therefore, the pump cycle time and the Nernst voltage cycle time are linearly proportional to the oxygen partial pressure. Figure 6 As shown.

[0079] Nernst voltage is affected by temperature. However, under certain operating conditions, the combined temperature characteristics of Nernst's law and the gas law governing oxygen can be significantly weakened. Similarly, since most temperature characteristics are observed near the pump reversal point, it is preferable to measure the Nernst voltage at V2, V3, and V4, where the actual temperature coefficient (TC) is zero.

[0080] When operating in TC=0 mode, the system measures the time required for the voltage to reach V2, V3, and V4, which are marked in the diagram above: t1, t2, t4, and t5. Therefore, the corrected cycle time (td) is calculated as follows:

[0081] td = (t2 - t1) + (t5 - t4) (3);

[0082] Sensitivity or slope equals the cycle time (td or tp) (in milliseconds) divided by the known partial pressure of oxygen in the standard gas (P). O2 (Unit: millibars)

[0083] When calculated using td (with only one calibration point), the sensitivity is:

[0084]

[0085] When using td for calculation, the sensitivity or slope of a nominal sensor is typically 1.05 ms / mbar.

[0086] Combining formulas (2) and (4), the oxygen content percentage (O2%) can be calculated.

[0087]

[0088] Among them, td is calculated by the first microcontroller 161 in the control board 16, and the sensitivity is obtained by calibration in a standard gas, and the total gas pressure P total Data collected by pressure sensor 17.

[0089] 4. Spontaneous Combustion Warning Method: This monitoring method provides a set of data deep learning and intelligent warning solutions. The monitoring device stores the collected data such as oxygen content and temperature in the chip. When determining whether to issue a warning, the microcontroller queries historical data, compares and analyzes it, and combines it with the set oxygen content and temperature warning thresholds to make a warning decision.

[0090] Threshold setting: Set safe thresholds for oxygen content and temperature to ensure that the coal gangue pile does not spontaneously combust. The safety thresholds need to be set using simulation software to approximate the oxygen content and temperature values ​​at the point of spontaneous combustion in the coal gangue pile. The safety thresholds also need to be adjusted based on actual monitoring of the oxygen content and temperature values ​​at which spontaneous combustion of the coal gangue pile occurs.

[0091] Real-time monitoring: The system collects, stores, and analyzes oxygen content and temperature data in real time through monitoring equipment, and promptly detects trends in the monitoring data.

[0092] Warning signal: When the oxygen content and temperature data simultaneously meet the set safety thresholds, the microcontroller will query historical data, compare and analyze it, and after determining that the data is normal, the system will automatically issue a warning signal to remind relevant personnel to take measures.

[0093] This utility model discloses a device for monitoring the oxygen content and temperature of a coal gangue pile. During on-site installation, a hole needs to be drilled in the coal gangue pile using a backpack drill. The drilling depth is generally 1-3 meters. The length of the high-temperature tube is selected according to the hole depth. After assembling the detection part 1, it is placed in the drilled hole, ensuring that the control board housing 15 is above the ground surface. After installing the detection part 1, the original coal gangue is backfilled to the ground. The cable of the detection part 1 is passed through the lower hollow support tube of the main housing 21 and connected to the assembled upper hollow housing. Finally, the two ends of the lower hollow support tube are fixed. System testing is then performed.

Claims

1. A device for monitoring the oxygen content and temperature of a coal gangue pile, characterized in that, The device includes: a detection section (1) and an instrument main unit (2). The detection part (1) includes: a sample injection chamber (11), an oxygen content sensor (12), a temperature sensor (13), a high temperature resistant tube (14), a control board housing (15), a control board (16), and a pressure sensor (17); The oxygen content sensor (12) and pressure sensor (17) are arranged in the injection chamber (11). The injection chamber (11) is connected to one side of the high temperature resistant tube (14), and the other side of the high temperature resistant tube (14) is connected to the control board shell (15). Temperature sensor (13) is installed on the outside of the high-temperature resistant tube (14); The control board (16) is fixed inside the control board housing (15). The oxygen content sensor (12), pressure sensor (17), and temperature sensor (13) are all connected to the control board (16). The control board (16) is connected to the data acquisition module (23) of the instrument host (2).

2. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 1, characterized in that: The sample injection chamber (11) is connected to one side of the high-temperature tube (14) by a thread, and the other side of the high-temperature tube (14) is connected to the control board housing (15) by a thread.

3. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 1, characterized in that: The temperature sensor (13) is installed on the outside of the high-temperature resistant tube (14) via a snap-fit ​​structure.

4. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 1, characterized in that: The cables of the oxygen sensor (12), pressure sensor (17), and temperature sensor (13) pass through the bottom of the control board housing (15) through the first through hole and are connected to the control board (16).

5. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 1, characterized in that: The instrument host (2) includes a host housing (21), a battery module (22), and a solar thin film panel (24). The battery module (22) is arranged in the upper hollow shell of the host housing (21), the data acquisition module (23) is fixed in the upper hollow shell of the host housing (21), and the solar thin film panel (24) is arranged around and on the top of the upper hollow shell of the host housing (21).

6. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 5, characterized in that: The output cable of the control board (16) passes through the top of the control board housing (15) through the second through hole, through the lower hollow support tube of the main housing (21), and through the third through hole on the bottom surface of the upper hollow housing of the main housing (21) to connect to the data acquisition board (23).

7. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 5, characterized in that: The control board (16) includes a first microcontroller (161), a power control circuit (162), a voltage acquisition circuit (163), a current conversion circuit (164), and a power supply circuit (165); the microcontroller (161) is connected to the power control circuit (162), the voltage acquisition circuit (163), and the current conversion circuit (164) respectively. The first microcontroller (161) controls the power control circuit (162) and collects the output voltage signal of the oxygen content sensor (12) and the output signal of the pressure sensor (17) to calculate the percentage of oxygen content in the gas. The power control circuit (162) provides a constant current power supply to the oxygen content sensor (12); The voltage acquisition circuit (163) amplifies the voltage signals from the oxygen content sensor (12) and the pressure sensor (17). The current conversion circuit (164) converts the digital signal output by the microcontroller (161) into a 4-20mA current signal.

8. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 1, characterized in that: The data acquisition module (23) includes a second microcontroller (231), a 4G module (232), a WIFI module (233), an SPI storage (234), a power conversion module (235), a charging control circuit (236), a thermocouple drive circuit (237), and a current acquisition circuit (238); the second microcontroller (231) is connected to the 4G module (232), the WIFI module (233), the SPI storage (234), the thermocouple drive circuit (237), and the current acquisition circuit (238); the charging control circuit (236) is connected to the power conversion module (235).

9. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 1, characterized in that: The outer shell of the sample inlet chamber (11) is designed with a large number of small holes, and a breathable membrane is pasted on the inner wall of the sample inlet chamber (11) to block coal slag particles from entering the chamber, while ensuring that sample gas enters the chamber.

10. The device for monitoring oxygen content and temperature in a coal gangue pile according to claim 5, characterized in that: The main housing (21) includes a lower hollow support tube and an upper hollow housing. The upper hollow housing is installed on the lower hollow support tube. The upper hollow housing is rectangular in shape and has two internal layers. The lower layer holds the battery module (22), and the upper layer holds the data acquisition module (23). Solar thin film panels (24) are installed around the upper hollow housing and on the top.

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