Application Research And Equipment Development Of New Type Of Mine-used Network Combined With Peacetime And Wartime

At this stage,most of the underground communication network in coal mines in my country is an industrial Ethernet ring network,and this communication network can only be used in daily communications.This is because the backbone network and communication equipment of the industrial ring network suffer from coal mine accidents such as gas,roof,and electromechanical After the destruction,the network was basically paralyzed and unable to recover quickly,which caused the ground rescue center to be unable to obtain information about the accident area in time.In addition,the existing communication equipment is large in size and inconvenient to carry and move,which increases the difficulty of rescue.Therefore,it is of great significance to study a new type of mine-use network combined with peacetime and warfare and to develop portable communication equipment.Aiming at the application requirements of combined peace and war in the mine,in terms of communication network,after comparing traditional topological structures such as bus,ring and mesh,the thesis adopts a tree network that can be combined in peacetime and wartime as the backbone network,and further study the downhole application model and the "pruning"scheme.Compared with the traditional communication network,the tree network used in this thesis has improved functionality,reliability and scalability.In terms of communication equipment,a technical equipment supporting tree-shaped networking was developed for information interaction between uphole and downhole.The hardware is designed in accordance with the principle of intrinsic safety technology to meet the explosion-proof requirements of mining electrical equipment,and the hardware sub-units of the equipment are designed.The core processing unit,Ethernet transmission interface unit,reset unit and power supply unit constitute the overall hardware system.Among them,the core processing unit adopts the "microcontroller LPC1788+network chip BCM53101" solution,which improves the integration of the hardware system and reduces the volume and power consumption of the equipment;the power supply unit uses a dual protection circuit and a two-stage step-down circuit to supply power to each unit to ensure the reliability of the hardware circuit;the reset unit uses a dedicated chip to reset the microcontroller and the network chip at the same time,which improves the stability of the system when it is powered on.The equipment software adopts a layered design method,and the system layer adopts the embedded operating system ?C/OS-? with high stability and strong real-time performance,and realizes network device driver based on the protocol stack LwIP.The application layer implements the functions of DHCP client,SNMP Agent,VLAN and LLDP.The finished equipment has a volume of 162mm×121mm×33mm.test its function,performance and networking,the test results show that the throughput rate is 100%,the frame loss rate is 0,the delay is less than 15us,and the power consumption of the equipment is less than full load.3W,the storage and forwarding rate is 100%,and the optical fiber transmission distance is greater than 10km.The equipment application layer functions can work normally,and support tree networking and network topology discovery,which meets the expected indicators of the thesis.