Study Of The Key Technologies In Electric Haulage Monitoring System In Coal Mine

This dissertation studies the monitoring system of locomotive transport in coal mines, for which the fault-tree diagram is rendered, and the ORB fault model is set up. On the basis of analysis of the monitoring system in locomotive transport in coal mines, Come to the conclusion that the "orbit sensor", "Underground wireless transmission", "Multi-RF communication", "Speed detection in Sub-station" and "Dispatcher Errors" is the KeyTechnologies in the monitoring system of locomotive transport in coal mines.Analyzing and calculating the magnetic field of trolley locomotive rails, the mathematical EMF model for the magnetic field interference is set up. The design and installation of sub-station communicators is put forward for the transmission characteristic of electromagnetic waves in the underground roadway. Studying the collision of multi-point wireless communication in the underground locomotive monitoring system, a "quasi-TDMA" mode is put forward for the characteristics of wireless RF communication, in which ALOHA is combined with TDMA, and immediately changed into TDMA after access, with the synchronous mode by the sub-station clock in TDMA changed into a mode taking the wireless radio frequency network model as time reference. A mathematical model is set up respectively for the identification time of the pure ALOHA and the "quasi-TDMA" .The new model has been applied in practice for the short identification time and the lower effective signal collision in multi-point wireless communication. The dissertation also concerns the introduction of anti-interference measures of the software, the design for computerized monitoring interface and the multi-speed parameters' testing. Analyzing the dispatcher's errors in the transport monitoring system, a human error model is set up for the dispatchers in the monitoring system, whose errors in the system has been analyzed with preventive measures.