Downhole equipment based on LoRa node communication and environment monitoring system

Abstract

The utility model relates to underground equipment and an environment monitoring system based on LoRa node communication, and belongs to the technical field of underground equipment and environment monitoring. The system comprises a plurality of underground LoRa nodes and a data analysis server, the data analysis server is arranged on the ground or underground; each underground LoRa node comprises a microcontroller, a LoRa component, an equipment sensor component and an environment sensor component; a signal acquisition end of the equipment sensor assembly is connected with underground equipment to acquire an operation state signal of the equipment; the environment sensor assembly is installed on the well wall. Signal output ends of the equipment sensor assembly and the environment sensor assembly are connected with signal input pins of the microcontroller; a signal output pin of the microcontroller is connected with the LoRa component; and the LoRa component interacts with the data analysis server through a wireless signal. The underground equipment and the environment monitoring system based on LoRa node communication are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to underground equipment and environmental monitoring technical field especially relates to a kind of underground equipment and environmental monitoring system based on LoRa node communication. BACKGROUND

[0002] The coal mine underground environment is extremely complex, and there are many challenges. Roadways crisscross, with narrow and limited space, accompanied by coal dust, high humidity and possible gas leakage and other dangerous situations. These factors have put high demands on the stability, reliability and safety of wireless communication equipment and networks.

[0003] There are also a large number of electrical equipment and cables underground, which produce complex and strong electromagnetic interference, seriously affecting the transmission quality of wireless signals, increasing the error rate of communication, which may cause data loss or transmission errors, and thus affect the normal operation and safety monitoring of coal production. Therefore, there is an urgent need for a stable and reliable underground equipment and environmental monitoring system in the prior art. SUMMARY

[0004] In view of the above analysis, the utility model aims to provide a kind of underground equipment and environmental monitoring system based on LoRa node communication to solve the problem that the existing coal mine underground environment lacks a stable and reliable underground equipment and environmental monitoring system.

[0005] The purpose of the utility model is mainly realized through the following technical solutions:

[0006] An underground equipment and environmental monitoring system based on LoRa node communication, the system includes a plurality of underground LoRa nodes, data analysis server; data analysis server is set on the ground or underground; each underground LoRa node includes microcontroller, LoRa component, equipment sensor component, environmental sensor component; equipment sensor component signal acquisition end is connected with underground equipment, obtains the running state signal of equipment; environmental sensor component is installed on the well wall; equipment sensor component and environmental sensor component signal output end are all connected microcontroller signal input pin; microcontroller signal output pin connects LoRa component; LoRa component interacts with data analysis server through wireless signal.

[0007] Further, each underground LoRa node further includes a signal conditioning circuit; the signal conditioning circuit includes a power amplifier, a plurality of low-noise amplifiers, a radio frequency switch, and a plurality of filter banks; the input ends of the plurality of filter banks are respectively connected to the equipment sensor component and the environmental sensor component, and the output ends are respectively connected to the input ends of a low-noise amplifier; the output end of each low-noise amplifier is connected to the microcontroller; the output end of the microcontroller is connected to the power amplifier, and the output end of the power amplifier is connected to the radio frequency switch.

[0008] Further, the device sensor assembly includes a current sensor, a temperature sensor, a vibration sensor, and a displacement sensor; the current sensor includes a Hall effect current sensor; the temperature sensor includes a PT100 platinum resistance temperature sensor; the vibration sensor and the displacement sensor are installed on the surface of the downhole device.

[0009] Further, the environmental sensor assembly includes a gas concentration sensor, a humidity sensor, and a dust concentration sensor, and a ground stress sensor; the gas concentration sensor includes a catalytic combustion type gas sensor; the humidity sensor includes a capacitive humidity sensor; the dust concentration sensor includes a dust sensor based on light scattering principle; the ground stress sensor is horizontally installed on the sidewall of the downhole roadway.

[0010] Further, each downhole LoRa node further includes a power supply assembly; the power supply assembly includes a rechargeable battery or a mine-used intrinsic safety power supply; the power supply assembly is connected with the microcontroller, the signal conditioning circuit, the LoRa assembly, the device sensor assembly, and the environmental sensor assembly.

[0011] Further, the system further includes a signal interference suppression device; the signal interference suppression device surrounds the periphery of the downhole device; the signal interference suppression device includes a multilayer metal shield and an electromagnetic absorption material layer; the electromagnetic absorption material layer is laid on the inner wall of the multilayer metal shield; the multilayer metal shield is provided with a plurality of heat dissipation holes on the top surface, the bottom surface, and the side surface of the multilayer metal shield.

[0012] Further, the electromagnetic absorption material includes a ferrite material.

[0013] Further, the filter set includes one or more of an inductive filter, a capacitive filter, and a surface acoustic wave filter; the capacitive filter includes a ceramic filter; the surface acoustic wave filter is used to filter out high-frequency noise; the inductive filter is used to filter out low-frequency noise; and the capacitive filter is used to filter out high-frequency and low-frequency noise.

[0014] Further, each downhole LoRa node further includes an SPI or I 2 C high-speed serial interface, and the SPI or I 2 C high-speed serial interface input end is connected with the device sensor assembly and the environmental sensor assembly, and the output end is connected with the filter set.

[0015] Further, the surfaces of the device sensor assembly and the environmental sensor assembly are provided with encodings; the downhole LoRa node further includes a signboard identification assembly, and the signboard identification assembly includes a two-dimensional code scanner and an RFID reader; the two-dimensional code scanner and the RFID reader are used to read the encodings of the device sensor assembly and the environmental sensor assembly.

[0016] Compared with the prior art, the utility model at least can realize following beneficial effect one:

[0017] 1, the utility model discloses a system's each downhole LoRa node includes microcontroller, LoRa component, equipment sensor component, environmental sensor component, signal conditioning circuit, signal conditioning circuit includes power amplifier, a plurality of low noise amplifier, radio frequency switch, a plurality of filter groups, the plurality of filter groups input respectively connect equipment sensor component, environmental sensor component, and the output end is connected to a low noise amplifier input respectively, and each low noise amplifier output end all connects microcontroller, and microcontroller output end connects power amplifier, and power amplifier output end connects radio frequency switch, can adjust according to the data condition that sensor component is gathered, weak signal amplification, filter to noise, can also for the equipment of not working or stable work reduce sampling frequency, for temperature or current abnormal equipment improves sampling frequency, is a kind of stable reliable downhole equipment and environmental monitoring system.

[0018] 2, the utility model discloses system selects LoRa node and is laid in coal mine, has the characteristics of long-distance communication range, low power consumption that can cover, and low power consumption characteristics make equipment can be long time operation without frequently replacing battery.

[0019] 3, the utility model discloses system signal interference suppression device surrounds in downhole equipment periphery, and signal interference suppression device includes multilayer metal shielding case and electromagnetic absorption material layer, and electromagnetic absorption material layer is laid in multilayer metal shielding case inner wall, and signal interference suppression device is further provided with ventilation passage, and multilayer metal is provided with a plurality of heat dissipation holes on shielding case, and heat dissipation hole is arranged on the top surface, bottom surface and side surface of multilayer metal shielding case, shielding electromagnetic interference equipment is shielded while not affecting equipment heat dissipation, avoid wireless signal transmission to be interfered with by the electromagnetic wave of equipment radiation, guarantee equipment normal operation simultaneously.

[0020] 4, the utility model discloses system sets up a variety of sensors, and is used for the dynamic detection equipment's operating current, temperature and so on operating state and environmental gas concentration, temperature, humidity, and judges equipment state and environmental condition in real time through data analysis server and guarantees equipment effective operation.

[0021] 5, the utility model discloses equipment sensor component and environmental sensor component surface are equipped with coding, two-dimensional code scanner and RFID reader, convenient maintenance personnel look over and verify when needing, and RFID reader adopts low frequency band (such as 125kHz), to reduce electromagnetic interference and improve the penetration ability, ensure that node can accurately read the information on signboard in complex downhole environment.

[0022] The above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the following content, and some advantages can be apparent from the description or can be understood by implementing the present application. The purposes and other advantages of the present application can be realized and obtained through the content specifically indicated in the text and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings are only for the purpose of illustrating specific embodiments and are not considered as limiting the present application, and in the entire drawings, the same reference signs represent the same components.

[0024] Figure 1 It is a device connection relationship schematic diagram of a downhole equipment and environment monitoring system based on LoRa node communication.

[0025] Figure 2 It is a signal conditioning circuit connection relationship schematic diagram of a downhole LoRa node of a downhole equipment and environment monitoring system based on LoRa node communication. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present application will be specifically described below in combination with the drawings, wherein the drawings constitute a part of the present application and are used to explain the principles of the present application together with the embodiments of the present application, and are not used to limit the scope of the present application.

[0027] One specific embodiment of the present application discloses a downhole equipment and environment monitoring system based on LoRa node communication, and a connection relationship schematic diagram is shown in Figure 1 The system comprises a plurality of downhole LoRa nodes and a data analysis server, and the data analysis server is arranged on the ground or in the downhole. Each downhole LoRa node comprises a microcontroller, a LoRa component, a device sensor component and an environment sensor component. The device sensor component signal acquisition end is connected with the downhole equipment to acquire the running state signal of the equipment. The environment sensor component is installed on the well wall. The signal output ends of the device sensor component and the environment sensor component are connected with the microcontroller signal input pin. The microcontroller signal output pin is connected with the LoRa component. The LoRa component interacts with the data analysis server through wireless signals.

[0028] Specifically, the microcontroller is used for processing the device sensor component, the environment sensor component data and the LoRa communication. A specific embodiment of the present application selects a low-power microcontroller, such as an ARM Cortex-M series microcontroller. The LoRa component adopts a high-performance LoRa chip, such as SX1276 or SX1278. The LoRa component is used for wireless communication and has the characteristics of long distance and low power consumption.

[0029] The device sensor assembly includes a current sensor, a temperature sensor, a vibration sensor, and a displacement sensor; the current sensor includes a Hall effect current sensor; the temperature sensor includes a PT100 platinum resistance temperature sensor; the vibration sensor and the displacement sensor are installed on the surface of the downhole device.

[0030] Specifically, the current sensor is arranged on a signal conditioning circuit board inside the device, and the temperature sensor is arranged on the surface of the downhole device. The data collected by the current sensor, the temperature sensor, the vibration sensor, and the displacement sensor can determine the working state of the downhole device, such as switching on and off, standby state, and whether the performance is normal, and after being processed by the signal conditioning circuit, the data is transmitted to a data analysis server to monitor the device and the environmental conditions.

[0031] The environmental sensor assembly includes a gas concentration sensor, a humidity sensor, and a dust concentration sensor, and a ground stress sensor; the gas concentration sensor includes a catalytic combustion type gas sensor; the humidity sensor includes a capacitive humidity sensor; the dust concentration sensor includes a dust sensor based on light scattering principle; and the ground stress sensor is horizontally installed on the side of the downhole roadway.

[0032] Specifically, the ground stress sensor is used to analyze the relationship between the ground stress change and the vibration and displacement of the downhole device. If the gas concentration is too high in the downhole, the ventilation device is turned on; if the humidity exceeds the normal working range, the drying device is turned on. If the dust concentration is too high, it will prompt people not to enter, and only when the dust concentration is reduced to the normal range after the device is closed can people enter.

[0033] The connection relationship of the signal conditioning circuit is shown in Figure 2 .

[0034] Each downhole LoRa node further includes a signal conditioning circuit; the signal conditioning circuit includes a power amplifier, a plurality of low noise amplifiers, a radio frequency switch, and a plurality of filter groups; the input ends of the plurality of filter groups are connected to the device sensor assembly and the environmental sensor assembly, respectively, and the output ends are connected to the input ends of one low noise amplifier, respectively; the output end of each low noise amplifier is connected to a microcontroller; the output end of the microcontroller is connected to the power amplifier, and the output end of the power amplifier is connected to the radio frequency switch.

[0035] Specifically, each sensor output data in each sensor assembly is respectively filtered by a filter set, then amplified by a low noise amplifier and output to a microcontroller, the microcontroller has an analog data input channel, if not selected, the analog data input channel needs to be sampled by an AD conversion chip and then input to the microcontroller. The output end of the microcontroller is input to a power amplifier after DA conversion chip, and then connected to a radio frequency switch. When the device is on standby and the environment is stable, the downhole LoRa node automatically switches to an ultra-low power consumption mode, at this time the power supply assembly reduces the output voltage and current, the low noise amplifier and the power amplifier are adjusted to the lowest gain, the radio frequency switch closes the redundant path, and the microcontroller enters low power sleep mode and only retains the wake-up function, which greatly reduces the power consumption. When the device has a working requirement, it can quickly switch to the normal working mode, the power supply assembly restores normal output, the low noise amplifier and the power amplifier adjust the gain as needed, the radio frequency switch opens the necessary path, and the microcontroller wakes up to perform tasks, ensuring the timeliness and reliability of communication. Whether in low power standby mode or normal working state, the downhole LoRa node can adaptively adjust, effectively improving the running efficiency and stability under complex and variable working conditions.

[0036] Each downhole LoRa node further comprises an SPI or I 2 C high-speed serial interface, an SPI or I 2 C high-speed serial interface input end is connected with the device sensor assembly and the environmental sensor assembly, and the output end is connected with the filter set.

[0037] Specifically, each downhole LoRa node uses one or more SPI or I 2 C high-speed serial interface according to the number of sensors.

[0038] The filter set comprises one or more of an inductance filter, a capacitance filter and a surface acoustic wave filter; the capacitance filter comprises a ceramic filter; the surface acoustic wave filter is used for filtering high-frequency noise; the inductance filter is used for filtering low-frequency noise; and the capacitance filter is used for filtering high-frequency and low-frequency noise.

[0039] Specifically, one or more different filters can be selected according to the noise condition of the output data of different sensors.

[0040] Each downhole LoRa node further comprises a power supply assembly; the power supply assembly comprises a rechargeable battery or a mine intrinsic safety power supply; and the power supply assembly is connected with the microcontroller, the signal conditioning circuit, the LoRa assembly, the device sensor assembly and the environmental sensor assembly.

[0041] Specifically, the mine intrinsic safety power supply is a power supply that will not produce electric arc or electric spark and will not cause explosion or fire, and has the characteristics of good explosion-proof performance and safety and reliability. The low power consumption characteristics of the monitoring system of the LoRa node adopted in the embodiment enable the device to operate for a long time without frequent battery replacement.

[0042] The system further comprises a signal interference suppression device; the signal interference suppression device is surrounded by the periphery of the downhole equipment; the signal interference suppression device comprises a multilayer metal shielding cover and an electromagnetic absorption material layer; the electromagnetic absorption material layer is laid on the inner wall of the multilayer metal shielding cover; the multilayer metal shielding cover is provided with a plurality of heat dissipation holes; the heat dissipation holes are arranged on the top surface, the bottom surface and the side surface of the multilayer metal shielding cover.

[0043] The electromagnetic absorption material comprises a ferrite material.

[0044] Specifically, the electromagnetic absorption material can adopt a sheet structure and is fixed on the inner wall of the multilayer metal shielding cover.

[0045] The surfaces of the equipment sensor assembly and the environmental sensor assembly are provided with codes; the downhole LoRa node further comprises a signboard identification assembly, and the signboard identification assembly comprises a two-dimensional code scanner and an RFID reader; the two-dimensional code scanner and the RFID reader are used to read the codes of the equipment sensor assembly and the environmental sensor assembly.

[0046] Specifically, the two-dimensional code scanner and the RFID reader facilitate maintenance personnel to check and verify when needed, and can quickly locate the equipment to be searched in the case of complex downhole environment and dim light; the RFID reader adopts a low frequency band (such as 125 kHz) to reduce electromagnetic interference and improve the penetration ability, so as to ensure that the node can accurately read the information on the signboard in the complex downhole environment.

[0047] Compared with the prior art, each downhole LoRa node provided by the embodiment comprises a microcontroller, a LoRa component, a device sensor component, an environment sensor component and a signal conditioning circuit; the signal conditioning circuit comprises a power amplifier, a plurality of low-noise amplifiers, a radio frequency switch and a plurality of filter groups; input ends of the plurality of filter groups are connected to the device sensor component and the environment sensor component respectively, output ends are connected to input ends of the low-noise amplifiers respectively, and output ends of each low-noise amplifier are connected to the microcontroller; an output end of the microcontroller is connected to the power amplifier, and an output end of the power amplifier is connected to the radio frequency switch; the signal conditioning circuit can amplify a weak signal and filter noise according to data collected by the sensor components; meanwhile, the signal conditioning circuit can reduce a sampling frequency for a device that does not work or works stably and increase the sampling frequency for a device with abnormal temperature or current, so that a stable and reliable downhole device and environment monitoring system is provided. The LoRa node provided by the embodiment is arranged in a coal mine, has the characteristics of covering a long-distance communication range and low power consumption; the low power consumption characteristic enables the device to operate for a long time without frequent battery replacement. The system signal interference suppression device provided by the embodiment surrounds a periphery of the downhole device; the signal interference suppression device comprises a multilayer metal shielding cover and an electromagnetic absorption material layer; the electromagnetic absorption material layer is laid on an inner wall of the multilayer metal shielding cover; the signal interference suppression device is further provided with a ventilation channel; a plurality of heat dissipation holes are arranged on the multilayer metal shielding cover; the heat dissipation holes are arranged on top, bottom and side surfaces of the multilayer metal shielding cover; the electromagnetic interference device is shielded while the heat dissipation of the device is not affected; wireless signal transmission is prevented from being interfered by electromagnetic waves radiated by the device, and normal operation of the device is ensured. The system provided by the embodiment is provided with a plurality of sensors for dynamically detecting operating states such as working current and temperature of the device and gas concentration, temperature and humidity of the environment, and a data analysis server is used to judge the device state and the environment condition in real time to ensure effective operation of the device. The surface of the device sensor component and the environment sensor component of the system provided by the embodiment is provided with a code, a two-dimensional code scanner and an RFID reader; a maintenance personnel can check and verify when necessary; the RFID reader adopts a low frequency band (such as 125 kHz) to reduce electromagnetic interference and improve penetration ability, so that the node can accurately read information on a signboard in a complex downhole environment.

[0048] Those skilled in the art can understand that the programs / software involved in the above embodiments are common methods in the prior art, and the utility model does not involve any improvement in software aspects. The utility model only needs to connect various devices with corresponding functions through the connection relationship given in the utility model embodiments, and does not involve any improvement in program / software aspects. As for the connection mode between various hardware devices with corresponding functions, it can be realized by using the prior art, and will not be described in detail here.

[0049] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A downhole equipment and environment monitoring system based on LoRa node communication, characterized in that, The system comprises a plurality of downhole LoRa nodes, a data analysis server; the data analysis server is arranged on the ground or downhole; each downhole LoRa node comprises a microcontroller, a LoRa component, a device sensor component, an environmental sensor component; the device sensor component signal acquisition end is connected with a downhole device to obtain the running state signal of the device; the environmental sensor component is installed on the well wall; the device sensor component and the environmental sensor component signal output end are connected with the microcontroller signal input pin; the microcontroller signal output pin is connected with the LoRa component; the LoRa component interacts with the data analysis server through wireless signals.

2. The downhole equipment and environment monitoring system of claim 1, wherein, Each downhole LoRa node further comprises a signal conditioning circuit; the signal conditioning circuit comprises a power amplifier, a plurality of low-noise amplifiers, a radio frequency switch, and a plurality of filter groups; the plurality of filter groups input ends are respectively connected with the device sensor component and the environmental sensor component, and the output ends are respectively connected with a low-noise amplifier input end; the output end of each low-noise amplifier is connected with the microcontroller; the output end of the microcontroller is connected with the power amplifier, and the output end of the power amplifier is connected with the radio frequency switch.

3. The downhole equipment and environment monitoring system of claim 1, wherein, The device sensor component comprises a current sensor, a temperature sensor, a vibration sensor, and a displacement sensor; the current sensor comprises a Hall effect current sensor; the temperature sensor comprises a PT100 platinum resistance temperature sensor; the vibration sensor and the displacement sensor are installed on the surface of the downhole device.

4. The downhole equipment and environment monitoring system of claim 3, wherein, The environmental sensor component comprises a gas concentration sensor, a humidity sensor, and a dust concentration sensor, and a ground stress sensor; the gas concentration sensor comprises a catalytic combustion type gas sensor; the humidity sensor comprises a capacitive humidity sensor; the dust concentration sensor comprises a dust sensor based on light scattering principle; the ground stress sensor is horizontally installed on the side of the downhole roadway.

5. The downhole equipment and environment monitoring system of claim 1, wherein, Each downhole LoRa node further comprises a power supply component; the power supply component comprises a rechargeable battery or a mine intrinsic safety power supply; the power supply component is connected with the microcontroller, the signal conditioning circuit, the LoRa component, the device sensor component, and the environmental sensor component.

6. The downhole equipment and environment monitoring system of claim 1, wherein, The system further comprises a signal interference suppression device; the signal interference suppression device surrounds the periphery of the downhole device; the signal interference suppression device comprises a multilayer metal shielding cover and an electromagnetic absorption material layer; the electromagnetic absorption material layer is laid on the inner wall of the multilayer metal shielding cover; the multilayer metal shielding cover is provided with a plurality of heat dissipation holes on the top surface, the bottom surface, and the side surface.

7. The downhole equipment and environment monitoring system of claim 6, wherein, The electromagnetic absorption material comprises a ferrite material.

8. The downhole equipment and environment monitoring system of claim 2, wherein, The filter group comprises one or more of an inductance filter, a capacitance filter, and a surface acoustic wave filter; the capacitance filter comprises a ceramic filter; the surface acoustic wave filter is used to filter out high-frequency noise; the inductance filter is used to filter out low-frequency noise; and the capacitance filter is used to filter out high-frequency and low-frequency noise.

9. The downhole equipment and environment monitoring system of claim 1, wherein, Each downhole LoRa node also includes an SPI or I 2 C high speed serial interface, SPI or I 2 C high speed serial interface input connects to the device sensor assembly and environmental sensor assembly, and the output connects to the filter bank.

10. The downhole equipment and environment monitoring system of claim 2, wherein, The surfaces of the device sensor component and the environmental sensor component are provided with encodings; the downhole LoRa node further comprises a signboard identification component, which comprises a two-dimensional code scanner and an RFID reader; the two-dimensional code scanner and the RFID reader are used to read the encodings of the device sensor component and the environmental sensor component.

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