CN112584315A - System and method for realizing gas monitoring ultra-long-distance continuous transmission through LoRa network constructed by multiple channels - Google Patents
System and method for realizing gas monitoring ultra-long-distance continuous transmission through LoRa network constructed by multiple channels Download PDFInfo
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- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/08—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using communication transmission lines
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
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Abstract
The invention discloses a system and a method for realizing gas monitoring ultra-long-distance continuous transmission by a LoRa network constructed by multiple channels, and the following scheme is provided, wherein the system comprises a local area network controller node and a plurality of explosion-proof gas monitoring voice alarm nodes which form the local area network; the system comprises a main network consisting of a plurality of wireless repeater nodes, local area network controller nodes, a network main controller node and an upper computer in sequence, wherein the explosion-proof gas monitoring voice alarm nodes in the local area network are communicated in a LoRa transparent transmission mode, and each explosion-proof gas monitoring voice alarm node transmits polling signaling and alarm signaling to the corresponding local area network controller node in the LoRa transparent transmission mode by using an A-Z local area network channel. The invention realizes the forwarding across the operation areas and the notification of the adjacent affected operation areas, improves the anti-interference and stability of the system, calculates the affected areas, conveniently and accurately alarms, and adopts different channels without switching.
Description
Technical Field
The invention relates to the technical field of toxic and harmful gas monitoring, in particular to a system and a method for realizing ultra-long-distance gas monitoring and transmission by a LoRa network constructed by multiple channels.
Background
The poisonous and harmful gas monitoring is to detect the waste gas or gas source of each subarea in petrochemical, steel plant and iron plant in real time so as to ensure the safety of workers; the gas collecting device is used for monitoring the concentration of flammable gas, harmful gas, oxygen and other gases generated by oil refining, iron making and steel making equipment in real time.
The poisonous harmful gas monitoring alarm system of low-power consumption based on loRa local network deployment of general use at present, this system pass through gas sensor collection gas concentration information, report to the police to this operation region through the LoRa ad hoc network, to 485 bus formulas or wired optical fiber connection, the solution circuit that can be better lays the on-the-spot difficulty of implementing, the too high problem of transmission line maintenance cost.
However, the low-power-consumption toxic and harmful gas monitoring and alarming system based on the LoRa local area networking still has some non-negligible technical problems in the use process:
1. the alarm system gives an alarm as long as leakage exists, but the accurate distance between an operator in a nearby operation area and a leakage source cannot be reported due to large site noise or small decibel of the alarm, so that the operator in the operation area cannot leave a working site in time to cause injury, rescue preparation cannot be carried out at the first time, and the preparation time of self rescue or rescue of other people is delayed;
2. because the alarm system adopts single frequency channel communication, the same frequency interference exists in the channel;
3. the alarm system adopts 410MHz single frequency channel transmission for alarm signaling transmission, and because various chemical and metallurgical equipment in an area, such as a high-power rectifying device, are key in the industrial production process of various metals, chlor-alkali chemical industry and the like, the magnetic field interference is serious, and strong electromagnetic interference of various frequency bands can be generated on a measuring device and a circuit, so that the problem that the transmission of the alarm signaling is influenced by the external common frequency interference of the existing wireless system can be solved.
4 in practical application, it is difficult for a plurality of LoRa devices to realize automatic frequency hopping and channel replacement together, and once the electromagnetic environment of a use occasion is complex, if the frequencies of the gateway and the nodes are matched again, a certain time is required to delay, influence data acquisition and give an alarm in time.
Disclosure of Invention
The invention provides a system and a method for realizing gas monitoring ultra-long-distance continuous transmission by a LoRa network constructed by multiple channels.
In order to achieve the purpose, the invention adopts the following technical scheme:
the system for realizing the ultra-long-distance gas monitoring and transmission continuation is constructed by a LoRa network constructed by multiple channels, and comprises a local area network controller node and a plurality of explosion-proof gas monitoring voice alarm nodes, wherein the local area network is formed by the local area network controller node and the explosion-proof gas monitoring voice alarm nodes; the system comprises a plurality of wireless repeater nodes, a local area network controller node, a network main controller node and an upper computer, wherein the main network is formed by sequentially communicating the explosion-proof gas monitoring voice alarm nodes in the local area network in a LoRa transparent transmission mode, each explosion-proof gas monitoring voice alarm node transmits a polling signaling and an alarm signaling to the corresponding local area network controller node in the LoRa transparent transmission mode by using an A-Z local area network channel, the wireless repeater nodes transmit a response signaling to the corresponding next wireless repeater node in the LoRa transparent transmission mode by using a continuous transmission channel with increasing M1-Mn, the network main controller node receives and transmits data of the first wireless repeater node by using an M0 continuous transmission channel to form the main network together, and the network main controller node communicates with the upper computer by using RS485 or RS232 to complete final data uploading, each wireless repeater node is located within the control range of the corresponding a-Z lan and communicates with the lan controller node using the corresponding remote retransmission channel, or using the wireless repeater LoRa radio unit 3-2 using other channels without interference.
Preferably, the wireless repeater node comprises: the system comprises a first power supply, a first microprocessor, a LoRa wireless unit 1-1, a LoRa wireless unit 1-2 and a LoRa wireless unit 1-3;
the first power supply is respectively connected with the first message microprocessor, the LoRa wireless unit 1-1, the LoRa wireless unit 1-2 and the LoRa wireless unit 1-3;
the first message microprocessor is respectively connected with the LoRa wireless unit 1-1, the LoRa wireless unit 1-2 and the LoRa wireless unit 1-3;
the LoRa wireless units 1-3 collect data of the local area network controller;
the LoRa wireless unit 1-2 receives the data of the downstream repeater and responds;
the LoRa wireless unit 1-1 collects local area network data and downstream data and transmits the local area network data and the downstream data to the upstream repeater continuously.
Preferably, explosion-proof gas monitoring voice alarm node includes: the system comprises a second power supply, a second microprocessor, a LoRa wireless unit 2-1, a GPS wireless unit 2, a gas sensor module unit 2 and a flash voice alarm unit 2;
the second power supply is respectively connected with the second message microprocessor, the LoRa wireless unit 2-1, the GPS wireless unit 2, the gas sensor module unit 2 and the flash voice alarm unit 2;
and the second microprocessor is respectively connected with the LoRa wireless unit 2-1, the GPS wireless unit 2, the gas sensor module unit 2 and the flash voice alarm unit 2.
Preferably, the local area network controller node includes: the system comprises a third power supply, a third microprocessor, a LoRa wireless unit 3-1, a LoRa wireless unit 3-2 and a human-computer interaction interface;
the third power supply is respectively connected with the third microprocessor, the LoRa wireless unit 3-1, the LoRa wireless unit 3-2 and the human-computer interaction interface;
the third microprocessor is respectively connected with the LoRa wireless unit 3-1, the LoRa wireless unit 3-2 and the human-computer interaction interface;
the LoRa wireless unit 3-2 is used for realizing transmission of polling signaling and alarm signaling from the local area network controller node to all explosion-proof gas monitoring voice alarm nodes in the local area network by using a local area network channel;
the man-machine interaction interface is used for inputting security officers to display the dynamic worksheets collected in the local area network and performing operation such as silencing, node shielding and setting parameter changing according to commands of the security administrators.
Preferably, the network master controller node comprises: the system comprises a fourth power supply, a fourth microprocessor, a LoRa wireless unit 4-1, a GPS wireless unit 4, a human-computer interaction interface and an RS485(232) communication interface;
the fourth power supply is respectively connected with the fourth microprocessor, the LoRa wireless unit 4-1, the GPS wireless unit 4, the human-computer interaction interface and the RS485(232) communication interface;
the fourth microprocessor is respectively connected with the LoRa wireless unit 4-1, the GPS wireless unit 4, the human-computer interaction interface and the RS485(232) communication interface;
the local area network controller node is used for maintaining the working state of the local area network by using a dynamic working table thereof, generating a polling signaling according to the dynamic working table, and generating an alarm signaling when detecting that an alarm concentration set value exists at the node, wherein the dynamic working table of the local area network controller node is used for monitoring and maintaining the current online state, concentration information, alarm set value, alarm state, position and other information of each explosion-proof gas monitoring voice alarm node in the local area network, and a timestamp;
the third microprocessor comprises a network processing program, and the network processing program is used for registering network access, data transmission and disconnection reconnection;
the third microprocessor also comprises an interactive service program, and the interactive service program is responsible for driving the Lora wireless communication module to perform data interaction with the upstream and downstream repeater nodes;
a network main controller: the data of each local area network controller is gathered by matching with a network repeater, and the information of the whole large area is centralized;
the LoRa wireless unit 4-1 is used for receiving dynamic worksheets of all areas uploaded by the continuous transmission queue of the wireless repeater;
the communication interface (RS485, RS232) is used for uploading the data gathered by the network main controller to the upper computer;
a human-computer interaction interface: the system is used for inputting a system security administrator to display data gathered by the network main controller and performing operations such as silencing, screen switching and setting parameter changing according to commands received by the security administrator.
Preferably, the alarm signaling comprises a position coordinate field and an alarm node address code, the polling signaling is used for polling each explosion-proof gas monitoring voice alarm node in a local area network in an information table and uses an MODBUS communication protocol, the response signaling is used for polling each explosion-proof gas monitoring voice alarm node in the network for information such as an online state, concentration information, an alarm set value, an alarm state, a position and the like, and the online state field is used for indicating whether a terminal node is online or not;
the wireless repeater: the data of the last local area network controller is collected and uploaded to the upstream wireless repeater, then the data of the upstream local area network controller is collected and continuously relayed and continuously transmitted, the same frequency interference is avoided by changing different continuous transmission channels, and finally the whole network data is transmitted to the network main controller;
the network main controller is in wireless butt joint with the most upstream wireless repeater, collects all network numbers and uploads the network numbers to the upper computer through RS485 and RS232 interfaces so as to carry out further intelligent information processing;
an upper computer: the remote monitoring system is used, and is matched with a network main controller for remote control of the whole wireless network, so that the regional boundary can be crossed, various devices can be comprehensively operated through a regional network and a local area network, and the operation condition of the system can be remotely monitored through a monitoring function.
The method for realizing the ultra-long-distance gas monitoring transmission by the LoRa network constructed by multiple channels comprises the following steps:
s1, judging the current position by the gas monitoring system: the GPS device is used for reading longitude and latitude information of the current position according to the received GPS signal;
s2, the gas monitoring system performs boundary entering judgment: the system comprises a data base table, a leakage concentration level disposal preset table, a data processing unit and a data processing unit, wherein the data base table is used for reading the coverage area danger source database table and the leakage concentration level disposal preset table, and when the current position is judged to be in the coverage area of the alarm area according to the coverage area of the leakage area and the longitude and latitude information of the current position, different alarm instructions are made;
s3, Risk assessment
The gas monitoring system draws up a risk evaluation table according to the database to evaluate the risk evaluation information of the risk source after the accident:
inputting evaluation information:
gas type, gas concentration, gas temperature, type of hazard source within range, etc.;
database information query:
leakage gas toxicity, molecular weight, density; explosive properties of combustible gas, etc.;
and (4) outputting evaluation information:
the method comprises the steps of danger numbering, risk types, hazard grades, protection ranges and alarm radiuses;
and (3) alarm information output:
obtaining alarm statement content numbers of alarm radius central areas around leakage points, protection early-warning statement content numbers of alarm radius annular areas and adjacent danger source early-warning statement content numbers;
s4, the gas monitoring system sends out alarm instructions to three different areas and sends out different alarm signals to different nodes according to the alarm content;
s5, the explosion-proof gas monitoring voice alarm node sends out alarm instructions according to the gas monitoring system and sends out different alarm voices and flashing signals;
the alarm is divided into two types:
and (4) hazard alarm:
alarm of extremely hazardous and highly hazardous toxic gas leaks or potentially explosive combustible gas leaks;
and (4) alarming together:
the node does not generate hazard alarm, but the gas monitoring system determines the influence on the area according to the evaluation reason of the generated hazard alarm and gives a joint alarm to the area, and the alarm is irrelevant to the monitoring of the gas type by the probe.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention solves the technical problems that the existing alarm system can not alarm the specific position of the operation area, the existing alarm system can not transmit across the operation area, the adjacent affected operation area can not inform, the internal same frequency interference of the channel causes low system timeliness, and the transmission process of the alarm signaling has interference, and improves the anti-interference and stability of the system;
2. calculating the affected area according to the GPS, wherein the affected area needs to be subjected to voice alarm, playing various alarm sentences with different flashing colors for distinguishing, preparing rescue, not only alarming at a single leakage point, but also alarming at probes in a harmful area, and conveniently and quickly and accurately alarming;
3. at least 2 or even a plurality of LoRa wireless units are arranged in each repeater and correspond to different channels without switching.
Drawings
FIG. 1 is a schematic diagram of a flow structure proposed by the present invention;
FIG. 2 is a schematic diagram of a wireless repeater according to the present invention;
FIG. 3 is a schematic view of a node of an explosion-proof gas monitoring voice alarm according to the present invention;
fig. 4 is a schematic diagram of a lan controller system according to the present invention;
FIG. 5 is a schematic diagram of a network master controller system according to the present invention;
FIG. 6 is a schematic diagram of a system of an upper computer according to the present invention;
FIG. 7 is a schematic diagram of a remote gas monitoring system according to the present invention;
fig. 8 is a layout diagram of the monitoring points of the major hazard source according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-8, the gas monitoring ultra-remote continuous transmission system is realized by a LoRa network constructed by multiple channels, and comprises a local area network controller node and a plurality of explosion-proof gas monitoring voice alarm nodes, wherein the local area network is formed by the local area network controller node and the explosion-proof gas monitoring voice alarm nodes; the system comprises a plurality of wireless repeater nodes, a local area network controller node, a network main controller node and an upper computer, wherein the main network is formed by sequentially communicating the explosion-proof gas monitoring voice alarm nodes in the local area network in a LoRa transparent transmission mode, each explosion-proof gas monitoring voice alarm node transmits a polling signaling and an alarm signaling to the corresponding local area network controller node in the LoRa transparent transmission mode by using an A-Z local area network channel, the wireless repeater nodes transmit a response signaling to the corresponding next wireless repeater node in the LoRa transparent transmission mode by using a continuous transmission channel with increasing M1-Mn, the network main controller node receives and transmits data of the first wireless repeater node by using an M0 continuous transmission channel to form the main network together, and the network main controller node communicates with the upper computer by using RS485 or RS232 to complete final data uploading, each wireless repeater node is located within the control range of the corresponding a-Z lan and communicates with the lan controller node using the corresponding remote retransmission channel, or using the wireless repeater LoRa radio unit 3-2 using other channels without interference.
Preferably, the wireless repeater node comprises: the system comprises a first power supply, a first microprocessor, a LoRa wireless unit 1-1, a LoRa wireless unit 1-2 and a LoRa wireless unit 1-3;
the first power supply is respectively connected with the first message microprocessor, the LoRa wireless unit 1-1, the LoRa wireless unit 1-2 and the LoRa wireless unit 1-3;
the first message microprocessor is respectively connected with the LoRa wireless unit 1-1, the LoRa wireless unit 1-2 and the LoRa wireless unit 1-3;
the LoRa wireless units 1-3 collect data of the local area network controller;
the LoRa wireless unit 1-2 receives the data of the downstream repeater and responds;
the LoRa wireless unit 1-1 collects local area network data and downstream data and transmits the local area network data and the downstream data to the upstream repeater continuously.
Preferably, explosion-proof gas monitoring voice alarm node includes: the system comprises a second power supply, a second microprocessor, a LoRa wireless unit 2-1, a GPS wireless unit 2, a gas sensor module unit 2 and a flash voice alarm unit 2;
the second power supply is respectively connected with the second message microprocessor, the LoRa wireless unit 2-1, the GPS wireless unit 2, the gas sensor module unit 2 and the flash voice alarm unit 2;
and the second microprocessor is respectively connected with the LoRa wireless unit 2-1, the GPS wireless unit 2, the gas sensor module unit 2 and the flash voice alarm unit 2.
Preferably, the local area network controller node includes: the system comprises a third power supply, a third microprocessor, a LoRa wireless unit 3-1, a LoRa wireless unit 3-2 and a human-computer interaction interface;
the third power supply is respectively connected with the third microprocessor, the LoRa wireless unit 3-1, the LoRa wireless unit 3-2 and the human-computer interaction interface;
the third microprocessor is respectively connected with the LoRa wireless unit 3-1, the LoRa wireless unit 3-2 and the human-computer interaction interface;
the LoRa wireless unit 3-2 is used for realizing transmission of polling signaling and alarm signaling from the local area network controller node to all explosion-proof gas monitoring voice alarm nodes in the local area network by using a local area network channel;
the man-machine interaction interface is used for inputting security officers to display the dynamic worksheets collected in the local area network and performing operation such as silencing, node shielding and setting parameter changing according to commands of the security administrators.
Preferably, the network master controller node comprises: the system comprises a fourth power supply, a fourth microprocessor, a LoRa wireless unit 4-1, a GPS wireless unit 4, a human-computer interaction interface and an RS485(232) communication interface;
the fourth power supply is respectively connected with the fourth microprocessor, the LoRa wireless unit 4-1, the GPS wireless unit 4, the human-computer interaction interface and the RS485(232) communication interface;
the fourth microprocessor is respectively connected with the LoRa wireless unit 4-1, the GPS wireless unit 4, the human-computer interaction interface and the RS485(232) communication interface;
the local area network controller node is used for maintaining the working state of the local area network by using a dynamic working table thereof, generating a polling signaling according to the dynamic working table, and generating an alarm signaling when detecting that an alarm concentration set value exists at the node, wherein the dynamic working table of the local area network controller node is used for monitoring and maintaining the current online state, concentration information, alarm set value, alarm state, position and other information of each explosion-proof gas monitoring voice alarm node in the local area network, and a timestamp;
the third microprocessor comprises a network processing program, and the network processing program is used for registering network access, data transmission and disconnection reconnection;
the third microprocessor also comprises an interactive service program, and the interactive service program is responsible for driving the Lora wireless communication module to perform data interaction with the upstream and downstream repeater nodes;
a network main controller: the data of each local area network controller is gathered by matching with a network repeater, and the information of the whole large area is centralized;
the LoRa wireless unit 4-1 is used for receiving dynamic worksheets of all areas uploaded by the continuous transmission queue of the wireless repeater;
the communication interface (RS485, RS232) is used for uploading the data gathered by the network main controller to the upper computer;
a human-computer interaction interface: the system is used for inputting a system security administrator to display data gathered by the network main controller and performing operations such as silencing, screen switching and setting parameter changing according to commands received by the security administrator.
Preferably, the alarm signaling comprises a position coordinate field and an alarm node address code, the polling signaling is used for polling each explosion-proof gas monitoring voice alarm node in a local area network in an information table and uses an MODBUS communication protocol, the response signaling is used for polling each explosion-proof gas monitoring voice alarm node in the network for information such as an online state, concentration information, an alarm set value, an alarm state, a position and the like, and the online state field is used for indicating whether a terminal node is online or not;
the wireless repeater: the data of the last local area network controller is collected and uploaded to the upstream wireless repeater, then the data of the upstream local area network controller is collected and continuously relayed and continuously transmitted, the same frequency interference is avoided by changing different continuous transmission channels, and finally the whole network data is transmitted to the network main controller;
the network main controller is in wireless butt joint with the most upstream wireless repeater, collects all network numbers and uploads the network numbers to the upper computer through RS485 and RS232 interfaces so as to carry out further intelligent information processing;
an upper computer: the remote monitoring system is used, and is matched with a network main controller for remote control of the whole wireless network, so that the regional boundary can be crossed, various devices can be comprehensively operated through a regional network and a local area network, and the operation condition of the system can be remotely monitored through a monitoring function.
The method for realizing the ultra-long-distance gas monitoring transmission by the LoRa network constructed by multiple channels comprises the following steps:
s1, judging the current position by the gas monitoring system: the GPS device is used for reading longitude and latitude information of the current position according to the received GPS signal;
s2, the gas monitoring system performs boundary entering judgment: the system comprises a data base table, a leakage concentration level disposal preset table, a data processing unit and a data processing unit, wherein the data base table is used for reading the coverage area danger source database table and the leakage concentration level disposal preset table, and when the current position is judged to be in the coverage area of the alarm area according to the coverage area of the leakage area and the longitude and latitude information of the current position, different alarm instructions are made;
s3, Risk assessment
The gas monitoring system draws up a risk evaluation table according to the database to evaluate the risk evaluation information of the risk source after the accident:
inputting evaluation information:
gas type, gas concentration, gas temperature, type of hazard source within range, etc.;
database information query:
leakage gas toxicity, molecular weight, density; explosive properties of combustible gas, etc.;
and (4) outputting evaluation information:
the method comprises the steps of danger numbering, risk types, hazard grades, protection ranges and alarm radiuses;
and (3) alarm information output:
obtaining alarm statement content numbers of alarm radius central areas around leakage points, protection early-warning statement content numbers of alarm radius annular areas and adjacent danger source early-warning statement content numbers;
s4, the gas monitoring system sends out alarm instructions to three different areas and sends out different alarm signals to different nodes according to the alarm content;
s5, the explosion-proof gas monitoring voice alarm node sends out alarm instructions according to the gas monitoring system and sends out different alarm voices and flashing signals;
the alarm is divided into two types:
and (4) hazard alarm:
alarm of extremely hazardous and highly hazardous toxic gas leaks or potentially explosive combustible gas leaks;
and (4) alarming together:
the node does not generate hazard alarm, but the gas monitoring system determines the influence on the area according to the evaluation reason of the generated hazard alarm and gives a joint alarm to the area, and the alarm is irrelevant to the monitoring of the gas type by the probe.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The system for realizing the ultra-long-distance gas monitoring and transmission continuation is constructed by a LoRa network constructed by multiple channels, and comprises a local area network controller node and a plurality of explosion-proof gas monitoring voice alarm nodes, wherein the local area network is formed by the local area network controller node and the explosion-proof gas monitoring voice alarm nodes; the main network is characterized in that each explosion-proof gas monitoring voice alarm node in the local network is communicated in a LoRa transparent transmission mode, each explosion-proof gas monitoring voice alarm node transmits a polling signaling and an alarm signaling to the corresponding local network controller node in the LoRa transparent transmission mode by using an A-Z local network channel, the wireless relay node transmits a response signaling to the next corresponding wireless relay node in the LoRa transparent transmission mode by using a continuous transmission channel with increasing M1-Mn, the network main controller node receives and transmits the data of the first wireless relay node by using an M0 continuous transmission channel so as to jointly form the main network, and the network main controller node communicates with the upper computer by using RS485 or RS232 to finish the last data uploading, each wireless repeater node is located within the control range of the corresponding a-Z lan and communicates with the lan controller node using the corresponding remote retransmission channel, or using the wireless repeater LoRa radio unit 3-2 using other channels without interference.
2. The LoRa network implemented gas monitoring ultra-long-haul system of claim 1, wherein the wireless repeater node comprises: the system comprises a first power supply, a first microprocessor, a LoRa wireless unit 1-1, a LoRa wireless unit 1-2 and a LoRa wireless unit 1-3;
the first power supply is respectively connected with the first message microprocessor, the LoRa wireless unit 1-1, the LoRa wireless unit 1-2 and the LoRa wireless unit 1-3;
the first message microprocessor is respectively connected with the LoRa wireless unit 1-1, the LoRa wireless unit 1-2 and the LoRa wireless unit 1-3;
the LoRa wireless units 1-3 collect data of the local area network controller;
the LoRa wireless unit 1-2 receives the data of the downstream repeater and responds;
the LoRa wireless unit 1-1 collects local area network data and downstream data and transmits the local area network data and the downstream data to the upstream repeater continuously.
3. The LoRa network-based gas monitoring ultra-long distance transmission system according to claim 1, wherein the explosion-proof gas monitoring voice alarm node comprises: the system comprises a second power supply, a second microprocessor, a LoRa wireless unit 2-1, a GPS wireless unit 2, a gas sensor module unit 2 and a flash voice alarm unit 2;
the second power supply is respectively connected with the second message microprocessor, the LoRa wireless unit 2-1, the GPS wireless unit 2, the gas sensor module unit 2 and the flash voice alarm unit 2;
and the second microprocessor is respectively connected with the LoRa wireless unit 2-1, the GPS wireless unit 2, the gas sensor module unit 2 and the flash voice alarm unit 2.
4. The LoRa network implemented gas monitoring ultra-long haul system of claim 1, wherein the local area network controller node comprises: the system comprises a third power supply, a third microprocessor, a LoRa wireless unit 3-1, a LoRa wireless unit 3-2 and a human-computer interaction interface;
the third power supply is respectively connected with the third microprocessor, the LoRa wireless unit 3-1, the LoRa wireless unit 3-2 and the human-computer interaction interface;
the third microprocessor is respectively connected with the LoRa wireless unit 3-1, the LoRa wireless unit 3-2 and the human-computer interaction interface;
the LoRa wireless unit 3-2 is used for realizing transmission of polling signaling and alarm signaling from the local area network controller node to all explosion-proof gas monitoring voice alarm nodes in the local area network by using a local area network channel;
the man-machine interaction interface is used for inputting security officers to display the dynamic worksheets collected in the local area network and performing operation such as silencing, node shielding and setting parameter changing according to commands of the security administrators.
5. The LoRa network implemented gas monitoring ultra-long haul transmission system of claim 4, wherein the network master controller node comprises: the system comprises a fourth power supply, a fourth microprocessor, a LoRa wireless unit 4-1, a GPS wireless unit 4, a human-computer interaction interface and an RS485(232) communication interface;
the fourth power supply is respectively connected with the fourth microprocessor, the LoRa wireless unit 4-1, the GPS wireless unit 4, the human-computer interaction interface and the RS485(232) communication interface;
the fourth microprocessor is respectively connected with the LoRa wireless unit 4-1, the GPS wireless unit 4, the human-computer interaction interface and the RS485(232) communication interface;
the local area network controller node is used for maintaining the working state of the local area network by using a dynamic working table thereof, generating a polling signaling according to the dynamic working table, and generating an alarm signaling when detecting that an alarm concentration set value exists at the node, wherein the dynamic working table of the local area network controller node is used for monitoring and maintaining the current online state, concentration information, alarm set value, alarm state, position and other information of each explosion-proof gas monitoring voice alarm node in the local area network, and a timestamp;
the third microprocessor comprises a network processing program, and the network processing program is used for registering network access, data transmission and disconnection reconnection;
the third microprocessor also comprises an interactive service program, and the interactive service program is responsible for driving the Lora wireless communication module to perform data interaction with the upstream and downstream repeater nodes;
a network main controller: the data of each local area network controller is gathered by matching with a network repeater, and the information of the whole large area is centralized;
the LoRa wireless unit 4-1 is used for receiving dynamic worksheets of all areas uploaded by the continuous transmission queue of the wireless repeater;
the communication interface (RS485, RS232) is used for uploading the data gathered by the network main controller to the upper computer;
a human-computer interaction interface: the system is used for inputting a system security administrator to display data gathered by the network main controller and performing operations such as silencing, screen switching and setting parameter changing according to commands received by the security administrator.
6. The system for realizing the ultra-remote gas monitoring and transmission by the LoRa network constructed by multiple channels according to claim 5 is characterized in that the alarm signaling comprises a position coordinate field and an alarm node address code, the alarm signaling is used for indicating the position of the current alarm node, the polling signaling is used for polling each explosion-proof gas monitoring voice alarm node in the local area network in the information table, an MODBUS communication protocol is used, the response signaling is used for polling each explosion-proof gas monitoring voice alarm node in the local area network, the information such as the online state, the concentration information, the alarm set value, the alarm state, the position and the like of each explosion-proof gas monitoring voice alarm node in the network is transmitted, and the online state field is used for indicating whether a terminal node;
the wireless repeater: the data of the last local area network controller is collected and uploaded to the upstream wireless repeater, then the data of the upstream local area network controller is collected and continuously relayed and continuously transmitted, the same frequency interference is avoided by changing different continuous transmission channels, and finally the whole network data is transmitted to the network main controller;
the network main controller is in wireless butt joint with the most upstream wireless repeater, collects all network numbers and uploads the network numbers to the upper computer through RS485 and RS232 interfaces so as to carry out further intelligent information processing;
an upper computer: the remote monitoring system is used, and is matched with a network main controller for remote control of the whole wireless network, so that the regional boundary can be crossed, various devices can be comprehensively operated through a regional network and a local area network, and the operation condition of the system can be remotely monitored through a monitoring function.
7. The method for realizing the ultra-long-distance gas monitoring transmission by the LoRa network constructed by multiple channels comprises the following steps:
s1, judging the current position by the gas monitoring system: the GPS device is used for reading longitude and latitude information of the current position according to the received GPS signal;
s2, the gas monitoring system performs boundary entering judgment: the system comprises a data base table, a leakage concentration level disposal preset table, a data processing unit and a data processing unit, wherein the data base table is used for reading the coverage area danger source database table and the leakage concentration level disposal preset table, and when the current position is judged to be in the coverage area of the alarm area according to the coverage area of the leakage area and the longitude and latitude information of the current position, different alarm instructions are made;
s3, Risk assessment
The gas monitoring system draws up a risk evaluation table according to the database to evaluate the risk evaluation information of the risk source after the accident:
inputting evaluation information:
gas type, gas concentration, gas temperature, type of hazard source within range, etc.;
database information query:
leakage gas toxicity, molecular weight, density; explosive properties of combustible gas, etc.;
and (4) outputting evaluation information:
the method comprises the steps of danger numbering, risk types, hazard grades, protection ranges and alarm radiuses;
and (3) alarm information output:
obtaining alarm statement content numbers of alarm radius central areas around leakage points, protection early-warning statement content numbers of alarm radius annular areas and adjacent danger source early-warning statement content numbers;
s4, the gas monitoring system sends out alarm instructions to three different areas and sends out different alarm signals to different nodes according to the alarm content;
s5, the explosion-proof gas monitoring voice alarm node sends out alarm instructions according to the gas monitoring system and sends out different alarm voices and flashing signals;
the alarm is divided into two types:
and (4) hazard alarm:
alarm of extremely hazardous and highly hazardous toxic gas leaks or potentially explosive combustible gas leaks;
and (4) alarming together:
the node does not generate hazard alarm, but the gas monitoring system determines the influence on the area according to the evaluation reason of the generated hazard alarm and gives a joint alarm to the area, and the alarm is irrelevant to the monitoring of the gas type by the probe.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110192A (en) * | 2021-04-22 | 2021-07-13 | 江苏中信博新能源科技股份有限公司 | Photovoltaic power station tracking control system and method |
| CN113507703A (en) * | 2021-07-05 | 2021-10-15 | 中国人民解放军国防科技大学 | LoRa multi-hop communication method and system for field rescue |
| CN115471934A (en) * | 2022-09-01 | 2022-12-13 | 国网安徽省电力有限公司合肥供电公司 | Transformer substation anti-misoperation system, method, platform and sensor terminal based on lora network |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110192A (en) * | 2021-04-22 | 2021-07-13 | 江苏中信博新能源科技股份有限公司 | Photovoltaic power station tracking control system and method |
| CN113110192B (en) * | 2021-04-22 | 2022-12-06 | 江苏中信博新能源科技股份有限公司 | Photovoltaic power station tracking control system and method |
| CN113507703A (en) * | 2021-07-05 | 2021-10-15 | 中国人民解放军国防科技大学 | LoRa multi-hop communication method and system for field rescue |
| CN115471934A (en) * | 2022-09-01 | 2022-12-13 | 国网安徽省电力有限公司合肥供电公司 | Transformer substation anti-misoperation system, method, platform and sensor terminal based on lora network |
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