CN219017075U - Networking structure of gas sensing terminal with multiple harmful gas detection functions - Google Patents
Networking structure of gas sensing terminal with multiple harmful gas detection functions Download PDFInfo
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Abstract
The utility model provides a networking structure of a gas sensing terminal with multiple harmful gas detection functions, which comprises the steps of arranging one or more gas sensing terminals in a foundation pit and arranging one or more field edge terminals outside the foundation pit; the gas sensing terminal and the field edge terminal are connected through a LoraWan network; the field edge terminal is connected with a background monitoring system through a mobile communication network; the gas sensing terminal adopts a singlechip as a processor and is respectively connected with the lora module, the oxygen sensor, the carbon monoxide sensor, the hydrogen sulfide sensor, the methane sensor and the power module. The preferred design of networking structure and node equipment more suitable for foundation pit construction sites is provided.
Description
Technical Field
The utility model belongs to the technical field of power equipment and power construction, and particularly relates to a networking structure of a gas sensing terminal with multiple harmful gas detection functions.
Background
Before the high-voltage transmission line tower is erected, a vertical deep well with the radius of 1 meter and the depth of 10-20 meters is generally required to be drilled, and the tower is firmly fixed on the ground of a building point through the deep well. In order to avoid residential areas, high-voltage transmission line towers are generally erected in mountain areas and other complex areas, and large-scale machines cannot be driven to field operation, so that manual digging type construction is mostly adopted on the field. However, due to complex geological conditions of the tower frame set point, the soil exposed in the deep well may have potential safety hazards of inflammable and explosive, excessive concentration of harmful gases such as hydrogen sulfide and carbon monoxide, low concentration of oxygen and the like, and life safety of constructors is threatened.
According to the requirements of relevant safety working regulations, before constructors enter a deep foundation pit for operation, the concentration of oxygen, inflammable and explosive gas and toxic and harmful gas in an operation space needs to be detected, so that the safety of the operation space is ensured, and the constructors can enter the foundation pit for operation, thereby preventing major safety accidents.
At present, the common practice is mainly to measure the concentration of harmful gas before pit sinking, and the common method is to adopt wired monitoring equipment to descend into a foundation pit to realize harmful gas sensing and signal transmission, and constructors confirm no harmful gas under the pit through a measuring device and then go into the well.
Although portable gas sensing terminals integrating a 4G module, ZIGBEE and WiFi wireless networking modules exist at present, 4G signals are basically absent under a vertical deep well with the depth of 20 meters; and ZIGBEE, wiFi and other wireless signals cannot normally communicate due to attenuation; placing the portable gas sensing terminal in the deep well, it is difficult or impossible for an on-the-mine constructor to directly acquire the measurement data of the underground detector, so that the portable gas sensing terminal is often required to be hoisted underground, and then hoisted to the ground for data reading after detection, so that the time delay exists in the measurement result, real-time monitoring cannot be performed, and the operation is very inconvenient.
In some remote areas, the base pits also have no 4G signals, so that the measured data cannot be uploaded and issued in real time for display.
In summary, the existing conventional measurement method has the following problems:
(1) In the operation process of a wired monitoring constructor, the concentration condition of harmful gas cannot be conveniently known, an underground person is required to be matched with the notification, or the alarm state of an underground monitoring device is concerned at any time, meanwhile, the space under a pit is narrow, and the cable of the wired monitoring equipment can influence the speed of the constructor in the pit and the operation efficiency; other operators on the foundation pit construction site cannot know whether the condition of the foundation pit environment is dangerous or not on the premise of not increasing equipment.
(2) Although the portable gas sensing terminal measurement mode can enable constructors to know the condition of optimizing the gas concentration in real time during underground operation, the problem of data measurement delay exists in measurement before underground operation, because the underground gas concentration can change constantly, and when an alarm occurs in the construction process, the underground personnel cannot immediately know the underground condition to quickly take treatment measures, and the constructors cannot realize emergency rescue calling; other operators on the foundation pit construction site can not know whether the condition of the foundation pit environment is dangerous or not on the premise of not increasing equipment.
Disclosure of Invention
In order to overcome the defects and the shortcomings of the prior art, the utility model provides a networking structure of a gas sensing terminal with various harmful gas detection functions, and provides a networking structure more suitable for a foundation pit construction site and a preferable design of node equipment.
The method is characterized in that a LoraWan network is constructed on a construction site to realize regional networking inside and outside a foundation pit, and a hardware foundation is laid for localized collection and smooth early warning information. On the basis, remote transmission of information or on-site edge calculation processing can be further realized, construction safety can be effectively guaranteed, and the method is convenient to use and operate.
The technical scheme is as follows:
a networking structure of a gas sensing terminal with a plurality of harmful gas detection functions is characterized in that: one or more gas sensing terminals are arranged in the foundation pit, and one or more field edge terminals are arranged outside the foundation pit; the gas sensing terminal and the field edge terminal are connected through a LoraWan network; the field edge terminal is connected with a background monitoring system through a mobile communication network;
the gas sensing terminal adopts a singlechip as a processor and is respectively connected with the lora module, the oxygen sensor, the carbon monoxide sensor, the hydrogen sulfide sensor, the methane sensor and the power module.
Further, the singlechip adopts STM32L051, the lora module adopts Sx1278, the oxygen sensor adopts Honywell O2-G2, the carbon monoxide sensor adopts Honywell4CO-1000, the hydrogen sulfide sensor adopts Honywell4H2S-100, the methane sensor adopts Honywell4CH4-100, the power supply module adopts MP28163GQ, and a battery of Sanyo UR145003.7V4000mAh is configured.
Further, the gas sensing terminal is packaged by a polyester rubber shell, and a safety belt lock catch is arranged on the back of the shell through a reinforced threaded hole and used for clamping the gas sensing terminal on a safety belt worn by a constructor; openings are formed in the shell corresponding to the mounting positions of the four gas sensors and used for measuring gas diffused to the sensors; the four feet of the shell adopt transparent polyester windows for installing led indicator lamps, and the led indicator lamps are connected with the singlechip.
Further, the field edge terminal is encapsulated by a polyester rubber shell; and the bottom is provided with a permanent magnet which is used for being adsorbed on the surface of the foundation pit derrick.
Further, the field edge terminal includes: AI processor, memory, wiFi hotspot module, loraWan gateway, 4G/5G module, big dipper positioning module, audible and visual alarm, 485 communication control circuit and 11000mAh lithium cell; the LoraWan gateway is used for constructing a site Lora communication network and receiving concentration values of oxygen, methane, hydrogen sulfide and carbon monoxide uploaded by the gas sensing terminal.
Further, the air blower linkage interface is a power control relay node signal and 485 communication interface, and the field edge terminal is connected with the power of the air blower through a relay and is used for closing the power of the air blower of the field foundation pit when the gas concentration alarms, and is connected with the air blower through the 485 communication interface and is used for monitoring the running state of the air blower.
The utility model and the preferable scheme thereof provide a method for constructing the LoraWan network on a construction site to realize regional networking inside and outside a foundation pit, and lay a hardware foundation for locally acquiring and early warning information smoothly. On the basis, remote transmission of information or on-site edge calculation processing can be further realized, construction safety can be effectively guaranteed, and the method is convenient to use and operate.
Drawings
The utility model is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic diagram of a networking architecture according to an embodiment of the present utility model.
Fig. 2 is an external view of a hanging-type gas sensor terminal according to an embodiment of the present utility model.
Fig. 3 is a front elevational view of an embodiment of the present utility model in the field of edge termination.
Fig. 4 is a rear profile view of a field edge termination in accordance with an embodiment of the present utility model.
Fig. 5 is a background terminal interface diagram of a preferred embodiment of the present utility model.
Fig. 6 is a diagram of a mobile terminal interface according to a preferred embodiment of the present utility model.
Detailed Description
In order to make the features and advantages of the present patent more comprehensible, embodiments accompanied with figures are described in detail below:
it should be emphasized in particular that the structural design and features of the present embodiment have been particularly pointed out and explained in the foregoing description, and in this embodiment, a more preferred specific design suitable for practical use on this basis is provided, possibly including specific schemes involving software or methods, but not necessarily relying on these preferred techniques for achieving the design goals, nor should the disclosure of this embodiment be considered as limiting the scope of the structural design of this utility model.
The wireless hanging type foundation pit gas monitoring individual operation equipment suitable for the safety rope provided by the utility model realizes real-time monitoring of concentration values of combustible gas, oxygen, hydrogen sulfide and carbon monoxide of a deep foundation pit through the gas sensing terminal, uploads a calculation result to a monitoring background for display and monitoring through a lora wireless uploading field edge terminal (local edge data processing can be selected), and transmits the calculation result to a field mobile monitoring terminal for display and monitoring through a server.
The following functions can be realized on the basis of forming a lora local network and further remote communication networks:
when the concentration of target gas in the foundation pit reaches a set alarm value or constructors press an emergency call button of the hanging type gas sensing terminal, the on-site edge terminal, the monitoring background and the on-site mobile monitoring terminal synchronously send out remarkable sound, light and vibration alarm signals, the constructors, the background monitoring personnel and the on-site monitoring personnel are reminded that the concentration of the gas exceeds the standard, the constructors, the background monitoring personnel and the on-site monitoring personnel are required to avoid danger in time and take corresponding disposal measures, the working safety risk of the deep foundation pit is reduced, and the personal safety of the constructors is guaranteed.
More importantly, the design can solve the defects that the traditional wired monitoring equipment pays out along the well depth, the portable wireless detector cannot upload monitoring data and lacks a local distress function, the toxic gas condition of the foundation pit is monitored in real time under the noisy environment of the foundation pit construction site, and the defect that all personnel on the site cannot receive an alarm signal at the first time and miss the optimal processing time is overcome.
As shown in fig. 1, the networking equipment according to the embodiment comprises the following components:
the core part of the embodiment is a local lora networking structure formed by a gas sensing terminal and a field edge terminal, and the back end part belongs to a preferred scheme and is not necessary and core design.
In the preferred design, the intelligent monitoring system mainly comprises a sensing layer, a communication layer, a platform layer and an application layer, wherein the sensing layer is a hanging type gas sensing terminal arranged at different construction positions, the hanging type design of an adaptive safety rope is adopted, and the functions of monitoring the concentration of harmful gases such as methane, hydrogen sulfide and carbon monoxide and the like in a foundation pit environment and oxygen in real time, wireless uploading, local acousto-optic alarm, manual calling for help, calling for help and active cancellation can be realized through hanging on a safety belt of a site constructor.
The communication layer is a field edge terminal, a long-distance LoraWan network is adopted to serve as an intermediate bridge of a hanging type gas sensor and a background monitoring system, functions of positioning longitude and latitude of a foundation pit, receiving data of harmful gases such as methane, hydrogen sulfide and carbon monoxide in the environment of the foundation pit and oxygen concentration in real time, calculating, storing and predicting alarms in situ, uploading 4G to a monitoring background running on a cloud platform, controlling on-site acousto-optic vibration alarms, controlling linkage of a blower, connecting a tower tension and an inclination angle signal and the like are achieved, wiFi hot spots are provided, and data can be issued to all mobile monitoring terminals on the field through the WiFi network at the position without 4G network information.
The platform layer is a background monitoring system and runs on the cloud server to realize the functions of wireless hanging type equipment state management, hundred-degree map positioning, real-time receiving, storing, displaying, alarm threshold setting, alarm event inquiring, alarm state displaying, manual cancelling alarm interface and the like of harmful gas such as methane, hydrogen sulfide and carbon monoxide in foundation pit environments and oxygen concentration data of harmful gas detection of foundation pits at different positions.
The application layer is a field mobile monitoring terminal, accesses the data service of the background monitoring system through a tablet personal computer and a mobile phone, and realizes real-time display, alarm threshold setting and audible and visual alarm of harmful gas and oxygen concentration data such as methane, hydrogen sulfide, carbon monoxide and the like in a foundation pit environment in a distributed synchronous mode at construction sites of different construction sites and monitoring points of different positions of the same construction site.
As a specific preferred design, as shown in fig. 2, the gas sensing terminal is integrally encapsulated by a polyester rubber housing, and has the external dimensions of 115mm long, 72mm wide, 27mm thick and IP66 as an external protection grade.
The shape of the gas sensing terminal shell is designed according to the aesthetic requirement of human hands, so that the gas sensing terminal is convenient to hold, the back of the shell is designed to strengthen the threaded hole and install a safety belt lock catch (the conventional structural design is not shown in the figure), and constructors can clamp the gas sensing terminal on a wearable safety belt conveniently.
The intuitive SOS key is arranged under the shell, so that constructors can send out emergency rescue signals conveniently under abnormal conditions, and the function can be realized through a conventional technology on the basis of the singlechip. The shell reserves hole sites on the four gas sensors, so that gas can be conveniently diffused into the sensors for measurement. The four feet of the shell are designed into transparent polyester windows, so that the LED lamplight can be conveniently diffused.
The gas sensing terminal comprises a low-power consumption microprocessor, a liquid crystal display, three electrochemical sensors such as oxygen, hydrogen sulfide and carbon monoxide, a methane sensor, a conditioning circuit, an led indicator lamp, a buzzer, a vibrator, keys, a Lora module, a directional enhanced antenna and a 4000mAh lithium battery, wherein the full-power endurance time is 16 hours. The gas sensing terminal shell and all devices inside the gas sensing terminal shell are designed according to the explosion-proof requirement. The initial interface of the gas sensing terminal displays the concentration of oxygen, methane, hydrogen sulfide and carbon monoxide in real time and uploads the concentration to the site edge terminal through Lora, and when the concentration of the oxygen, methane, hydrogen sulfide and carbon monoxide exceeds a safety alarm threshold value, the gas sensing terminal sends out audible and visual vibration alarm information to remind constructors. When constructors press SOS keys, the gas sensing terminal interface displays SOS, simultaneously sends out audible and visual vibration alarm information, and sends out wireless data packets to inform the on-site edge terminal, after the emergency task is completed, constructors can press cancel keys to exit SOS alarm states, and the gas sensing terminal can simultaneously receive manual cancel alarm commands of the on-site mobile monitoring terminal to exit SOS alarm state numbers. The gas sensing terminal is shown in figure 2, and the main component options are shown in the following table.
| Battery cell | Sanyang UR145003.7V4000mAh |
| Lora module | Sx1278 |
| Processor and method for controlling the same | STM32L051 |
| Power supply LDO | MP28163GQ |
| Oxygen sensor | HonywellO2-G2 |
| Carbon monoxide sensor | Honywell4CO-1000 |
| Hydrogen sulfide sensor | Honywell4H2S-100 |
| Methane sensor | Honywell4CH4-100 |
As shown in fig. 3 and 4, the field edge terminal is encapsulated by a polyester rubber shell, the external dimension is 120mm long, 76mm wide and 60mm high, and the external protection grade is IP66. The strong magnet is arranged at the bottom of the field edge terminal, and the field can be directly adsorbed on the surface of the foundation pit derrick. The top surface of the shell is provided with a 4G, wiFi-Beidou three-in-one cake antenna, and the front surface of the shell is provided with a power button, a 4G-WiFi selection button, a Lora antenna, an electric quantity indicator lamp, a charger interface, a blower linkage interface and an audible-visual alarm.
As a preferable design, the site edge terminal internally comprises an AI processor, a memory, a WiFi hot spot module, a LoraWan gateway, a 4G module, a Beidou positioning module, an audible and visual alarm, a 485 communication control circuit and a 11000mAh lithium battery, wherein the full-power endurance time is 16 hours. The LoraWan gateway is mainly used for constructing a field Lora communication network, receiving oxygen, methane, hydrogen sulfide and carbon monoxide concentration values and SOS alarm states uploaded by the foundation pit gas sensing terminal, issuing a gas alarm threshold value set by a background monitoring system and the field monitoring terminal, and issuing an SOS state starting or clearing command.
As a further preferred scheme, the LoraWan gateway can also be used for receiving tower tension and inclination sensor data packets. 1 site edge terminal can be connected with the gas sensing terminal of 1 foundation pit, 4 tower pulling forces and 2 groups of tower dip angle monitoring terminals. The AI processor and the memory can collect, calculate and store parameters such as gas concentration, tower tension, inclination angle and the like of the foundation pit on site under the condition of programming design; the AI processor analyzes and calculates the received oxygen, methane, hydrogen sulfide, carbon monoxide concentration value, tension and inclination angle data, stores and alarms the data with super threshold value, constructs a random matrix through historical data waves, and predicts and alarms the development trend of each monitoring parameter by adopting a matrix analysis method.
The 4G module is used for uploading the oxygen, methane, hydrogen sulfide and carbon monoxide concentration values, tension and inclination angle data to the background monitoring system and receiving a gas alarm threshold value and an SOS state clearing or starting command issued by the background monitoring system. When the on-site 4G network is very poor and cannot be connected with the monitoring background, the 4G and WiFi selection buttons can enable constructors to switch the on-site terminal to a WiFi hot spot working mode, and foundation pit monitoring data and alarm state data are sent to each on-site mobile monitoring terminal through the WiFi hot spot. The audible and visual alarm is a buzzer with light indication, and when the AI processor judges that the oxygen, methane, hydrogen sulfide, carbon monoxide concentration value, tension and inclination angle real-time monitoring data exceed the threshold value, or the development trend is predicted to find that each monitoring parameter possibly exceeds the threshold value, the audible and visual alarm is controlled to alarm, and the on-site mobile monitoring terminal and the foundation pit gas sensing terminal synchronously carry out audible and visual alarm to remind constructors. The air blower linkage interface is a power control relay node signal and 485 communication interface, and the edge control terminal is used for closing an on-site foundation pit air blower power supply through the power control relay node after judging that the gas concentration is alarmed, so that the foundation pit can be quickly ventilated, and meanwhile, the operating state of the air blower is inquired and monitored through the 485 interface.
The background monitoring system realizes the functions of wireless hanging-matching equipment state management, hundred-degree map positioning, harmful gas concentration such as foundation pit environment methane, hydrogen sulfide, carbon monoxide and the like, tower tension, inclination angle, real-time receiving, storing, displaying, alarm threshold setting, alarm event inquiring, alarm state displaying, manual cancelling or starting an alarm interface, providing data service for a field mobile monitoring terminal and the like of different position foundation pit harmful gas detection, and comprises a map, data display, button control, a field edge terminal and a gas sensing terminal management part.
The map part displays the icon according to the longitude and latitude of the foundation pit, the icon is green in a normal state, and the corresponding icon can be changed into a red flashing state after the concentration of harmful gas in the foundation pit or the tension of the tower or the inclination angle value is alarmed; clicking the icon, the right part can display the current gas concentration value, the tower tension and inclination value, the monitoring terminal state and the alarm state of the foundation pit. The text box at the upper right side can input the number of the foundation pit, the positioning button is clicked, and the map display can automatically position the current foundation pit number. The right lower alarm button is used for manually clicking to clear or start an alarm state.
The on-site mobile monitoring terminal adopts a WEB design, and accesses a background monitoring system through mobile phones of constructors on the pit, so that the real-time downloading and displaying of harmful gases such as methane, hydrogen sulfide, carbon monoxide and the like in the foundation pit environment, concentration of oxygen, tower tension, inclination angle, manual rescue state data and alarm state, and the setting of alarm threshold values of monitoring parameters and the clearing or starting operation of SOS alarm states are realized on the premise of not additionally increasing the burden of equipment and constructors. The program supports the use of IOS and android mobile phone users, the interface can be self-adaptive according to the resolution of the mobile phone, and the clock is kept in full screen display. The data downloading mode is divided into 2 modes, namely, a background monitoring system is accessed through a field 4G signal; one is to access the field edge terminal through a WiFi hot spot to ensure that the device can work normally when no 4G signal exists in the construction field.
The program function module comprises three modules of a front page, data and configuration. The login authorities are divided into an administrator authority and a visitor authority, and different login authorities are set according to mobile phone numbers. Only the authority of an administrator can operate the function of the 'configuration' module to set the site edge terminal, the foundation pit gas sensing terminal, the tension and dip angle numbers and alarm threshold values of all monitoring parameters. The home page comprises a map, an alarm information list and an alarm start-stop button; map defaults to display all foundation pit point information, normal state is represented by green icon, alarm state is represented by red icon, site search frame can select foundation pit point icon needing to be displayed separately; the alarm information list displays alarm information events in the current time period, and the detailed alarm parameter values can be displayed by clicking a certain alarm information event; the "alarm start stop" button is used to clear or activate an alarm condition. The data interface can inquire the configured data waveforms of the field edge terminal, the foundation pit gas sensing terminal, the tensile force and the dip angle. See in particular fig. 5 and 6.
It should be noted that the above description of the background monitoring system and the on-site mobile monitoring terminal software design section is merely used as a reference for those skilled in the art to further implement functions based on the networking architecture design scheme of the present utility model, and is not an object to be protected by the present utility model, and the present utility model is implemented independently of the above software or method design.
According to the preferred embodiment design provided above, the following functions can be achieved:
1. based on the safety rope hanging installation, the foundation pit gas hanging type gas sensor realizes four gas concentration monitoring, foundation pit temperature monitoring, wireless uploading, manual emergency rescue alarming and local acousto-optic vibration alarming;
2. based on the LoraWan gateway, 4G and WiFi hot spots and the field edge terminal of an AI module, the functions of positioning the longitude and latitude of a foundation pit, receiving harmful gas such as methane, hydrogen sulfide and carbon monoxide in the environment of the foundation pit and oxygen concentration data in real time, carrying out on-site technology and predictive alarming, uploading 4G to a monitoring background running on a cloud platform, downloading and WiFi downloading monitoring data 4G by a field mobile monitoring terminal, carrying out on-site acousto-optic vibration alarming, manually starting and cleaning all terminals of an alarming signal and the like are realized;
3. the background monitoring system is operated on the cloud platform, and achieves the functions of wireless hanging type equipment state management, hundred-degree map positioning, real-time receiving, storing, displaying, alarm threshold setting, alarm event inquiring, alarm state displaying, manual cancellation of an alarm interface, data service providing for a field mobile monitoring terminal and the like of harmful gas such as pit environment methane, hydrogen sulfide, carbon monoxide and the like;
4. the field mobile terminal is arranged at the distributed monitoring points of construction bases at different positions and different foundation pit positions of the same construction base, and achieves the synchronization of real-time display of concentration data of harmful gases such as methane, hydrogen sulfide, carbon monoxide and the like, alarm threshold setting and audible and visual alarm of the distributed foundation pit environment.
Advantages of this preferred design include:
1. the portable gas sensing terminal integrates 4 gas measurements, has wireless Lora uploading and has smaller volume than other testers in the market; the advantages of real-time monitoring and manual calling for help in time of the traditional wired monitoring equipment are taken into consideration, and the portable wireless detector has the advantages of no lead wire collecting and releasing workload, interference with field operation and suitability for carrying by constructors;
2. the longitude and latitude positioning of different construction foundation pit positions can be realized, the concentration of harmful gas in the foundation pit and the emergency help signals of constructors can be synchronously monitored in real time, a hanging gas sensor, a field edge terminal, a monitoring background and a field mobile monitoring terminal can synchronously send out remarkable sound, light and vibration alarm signals, each monitoring post is timely and effectively reminded to timely take corresponding treatment measures, safety accidents are timely avoided, and each monitoring terminal has an alarm starting and clearing function.
The present patent is not limited to the above-mentioned best mode, any person can obtain other various forms of networking structures of the gas sensing terminal with various harmful gas detection functions under the teaching of the present patent, and all equivalent changes and modifications made according to the claims of the present application shall be covered by the present patent.
Claims (6)
1. A networking structure of a gas sensing terminal with a plurality of harmful gas detection functions is characterized in that: one or more gas sensing terminals are arranged in the foundation pit, and one or more field edge terminals are arranged outside the foundation pit; the gas sensing terminal and the field edge terminal are connected through a LoraWan network; the field edge terminal is connected with a background monitoring system through a mobile communication network;
the gas sensing terminal adopts a singlechip as a processor and is respectively connected with the lora module, the oxygen sensor, the carbon monoxide sensor, the hydrogen sulfide sensor, the methane sensor and the power module.
2. The networking structure of a gas sensing terminal having a plurality of harmful gas detection functions according to claim 1, wherein: the singlechip adopts STM32L051, the lora module adopts Sx1278, the oxygen sensor adopts Honywell O2-G2, the carbon monoxide sensor adopts Honywell4CO-1000, the hydrogen sulfide sensor adopts Honywell4H2S-100, the methane sensor adopts Honywell4CH4-100, the power supply module adopts MP28163GQ, and the three ocean UR145003.7V4000mAh battery is configured.
3. The networking structure of a gas sensing terminal having a plurality of harmful gas detection functions according to claim 1, wherein: the gas sensing terminal is packaged by a polyester rubber shell, and a safety belt lock catch is arranged on the back of the shell through a reinforced threaded hole and used for clamping the gas sensing terminal on a safety belt worn by a constructor; openings are formed in the shell corresponding to the mounting positions of the four gas sensors and used for measuring gas diffused to the sensors; the four feet of the shell adopt transparent polyester windows for installing led indicator lamps, and the led indicator lamps are connected with the singlechip.
4. The networking structure of a gas sensing terminal having a plurality of harmful gas detection functions according to claim 1, wherein: the field edge terminal is encapsulated by a polyester rubber shell; and the bottom is provided with a permanent magnet which is used for being adsorbed on the surface of the foundation pit derrick.
5. The networking structure of a gas sensing terminal having a plurality of harmful gas detection functions according to claim 1, wherein: the field edge terminal includes: AI processor, memory, wiFi hotspot module, loraWan gateway, 4G/5G module, big dipper positioning module, audible and visual alarm, 485 communication control circuit and 11000mAh lithium cell; the LoraWan gateway is used for constructing a site Lora communication network and receiving concentration values of oxygen, methane, hydrogen sulfide and carbon monoxide uploaded by the gas sensing terminal.
6. The networking structure of a gas sensing terminal with multiple harmful gas detection functions according to claim 5, wherein: the air blower linkage interface is a power control relay node signal and 485 communication interface, and the field edge terminal is connected with the power of the air blower through a relay and is used for closing the power of the air blower of the field foundation pit when the gas concentration alarms, and is connected with the air blower through the 485 communication interface and is used for monitoring the running state of the air blower.
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