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Taking the coal mine monitoring system as the platform and the monitoring substation as the design object, the dual data cache technology with multi-thread safety is designed. After the sensor data frames are stored in the queue, the monitoring substation analyzes and processes the data frames one by one, and then encapsulates them into Ethernet packets, which are sent to the central station, the data cache technology designed in this paper adds multi-thread safety protection. The practical application shows that the data cache queue software architecture is clear, occupies less memory, and is easy to implement. It improves the data processing ability of the substation, and solves the problems such as the delay and loss of substation instructions to the central station and sensor data.

In order to solve problems of graphical interfaces of existing coal mine safety monitoring and control systems such as inconsistent standards, different representation effect, inability to realize system linkage and so on, a design scheme of coal mine multi-system fusion linkage platform based on 'one map' was proposed according to requirements of Technology Schemes of Upgrading of Coal Mine Safety Monitoring and Control System. Structure of the platform and design of fusion linkage communication interface and GIS platform based on 'one map' mode were introduced. The platform adopts data dissemination technology of WebGIS and data interchange technologies of WebService and OPC to intensively display data of different coal mine safety monitoring and control systems on the unified GIS platform, and realizes multi-system fusion linkage through relating to logical relationship among each system device. The platform can improve monitoring and control level and supervision efficiency of coal mine safety production.

According to the requirements for underground multi-system fusion of Technology schemes of upgrading of coal mine safety monitoring and control system, and for the problem that fusion degree of underground monitoring and control system was not high, a new fusion sub-station with multi-communication interface and multi-sensor interface was designed. Based on the new fusion sub-station, an underground multi-system fusion method for coal mine safety monitoring and control was proposed. The fusion method adopts the new fusion sub-station to realize link level fusion, device level fusion and shared data level fusion according to field equipment acquisition interfaces, communication interfaces and fusion degree of different systems. The link level fusion can realize fusion of multiple sensor acquisition interfaces, device level fusion can realize equipment fusion of different systems, shared data level fusion can realize data sharing between different systems.

Present situation of coal mine safety monitoring and control system intelligentization was analyzed, such as difficult pseudo-data identification, complex installation and use of the system, simple function of fault diagnosis, difficult measurement of conformity between installation and use and standard requirements, single alarm disposal mechanism. Development countermeasures of coal mine safety monitoring and control system intelligentization were proposed according to requirements of Technology Schemes of Upgrading of Coal Mine Safety Monitoring and Control System, which included software pseudo-data identification, equipment self-identification installation, system self-diagnosis, grading alarm disposal mechanism, prediction and pre-warning of gas emission and fire.

Traditional software development methods rarely can reuse accumulated development experiments when developed same system, and cause vast repetitive work. In view of the problem, development method of software product line was proposed and applied into the software development for coal mine safety monitoring and control system. On the basis of analysis of product line of the system, relationships among characteristics of the system were discussed according to commonality and variability characteristics of the system, variability model of the coal mine safety monitoring and control field based on feature modeling method of variability was built. The model can effectively manage variability of the system, and can quickly complete requirements analysis of specific customized monitoring and control system under guidance of the characteristics dependency rules at the same time, which lays foundation for following realization of reusable framework in the coal mine safety monitoring and control field.

For multi-system fusion requirement in Technology schemes of upgrading of coal mine safety monitoring and control system(exposure draft), construction contents of multi-system fusion for coal mine safety monitoring and control were analyzed. A realization scheme of multi-system fusion platform for coal mine safety monitoring and control was introduced as well as its main functions. The platform collects data by fusion mode on the ground as well as unified data procession and comprehensive analysis, displays data by Web mode, and realizes fusion function of monitoring system and GIS by GIS graph software as well as multi-system linkage function and emergency linkage function.

Main problems about application of existing coal mine safety monitoring and control system were pointed out, such as unstable sensor performance and power supply, poor anti-interference performance of transmission lines, different system technology level, incomplete standards and so on. Technology requirements of Technology schemes of upgrading of coal mine safety monitoring and control system(exposure draft) were analyzed about system functions, performances and communication interfaces. A design scheme of new coal mine safety monitoring and control system was proposed according to requirements of Technology schemes of upgrading of coal mine safety monitoring and control system(exposure draft). Key technologies of the new system were introduced in details including new digital sensing, multi-system data fusion, distributed/local event/remote control, electromagnetic compatibility, fault diagnosis, plug and play, resuming from broken point, etc.

For data encryption storage requirement of safety monitoring and control system in Technology schemes of upgrading of coal mine safety monitoring and control system(exposure draft), database encryption technology was researched, and performances of four data encryption algorithms including DES, RSA, homomorphism and binary serialization were tested and compared. A data encryption scheme suitable for coal mine safety monitoring and control system was proposed, which used different data encryption algorithm for different field type. The scheme realizes safe and quick data encryption storage for coal mine safety monitoring and control system.

For multi-system fusion requirement in Technology schemes of upgrading of coal mine safety monitoring and control system(exposure draft), existing multi-system fusion condition of coal mine was analyzed, and an underground multi-system fusion scheme in collection control layer was proposed as well as an underground fusion substation. The fusion substation can realize three fusion modes including substation fusion, link fusion and data fusion according to interfaces and communication protocols of field devices in multi systems. The test result shows the fusion substation can access safety monitoring and control system, personnel location system, mine pressure monitoring system, gas drainage monitoring system and so on at the same time for data sharing.

For poor real-time communication, stability and anti electromagnetic interference performance of existing coal mine safety monitoring and control system, a digital coal mine safety monitoring and control system was proposed, and hardware scheme, software scheme and key technologies of the system were introduced. The system adopts dual redundancy structure of CAN bus and industrial Ethernet ring network, and takes LPC2294 ARM processor and μC/OS-Ⅱembedded operation system as cores. The test results show that communication success rate of CAN bus is 99.97% as well as utilization ratio is 40%-60% of the system with 10 km CAN bus, 32 digital substations and 200 sensors and actuators. The system can run 40 days continuously with stable data communication and without interrupted and abnormal data, and technique indexes of the system meet requirements of AQ 6201-2006 General technical requirements of coal mine safety monitoring and control system.

Networking alarm data types of coal mine safety monitoring and control system were analyzed. For coexisting problem of real alarm data and pseudo alarm data, a networking alarm data screening technology of coal mine safety monitoring and control system was proposed, and some key technologies were expounded including automatic identification of false alarm data of monitoring devices, automatic identification of sensor calibration data and breaking test data of three locking, automatic identification of sensor fault data, contrasting and analysis of real testing data by human and monitoring data, sensor identification in plane domain, etc. A networking alarm data screening platform of coal mine safety monitoring and control system was developed. The application result shows the platform can improve alarming accuracy rate of safety monitoring and control system.

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mine Automation is the property of Industry & Mine Automation Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

For problem that current coal mine safety monitoring and control system still uses master-slave response communication mode, which is unable to achieve multi-master concurrency of substation, real-time communication and jointed control between substations, the paper proposed a design scheme of a new type of signal converter of coal mine safety monitoring and control system. It gave structure model of monitoring and control system with polycyclic and peer to peer communication, and introduced designs of software and hardware of signal converter in details. The test results show that the substation can easily achieve multi-master concurrency and online expansion through the signal converter, peer to peer communication and control between the substations can be achieved without scheduling of host computer, which effectively shortens response time of the control of the system in hazardous areas and improves reliability of network structure.

In view of problem that performance of RS485 bus will be decreased by underground complex electromagnetic environment, so as to influence data transmission of coal mine safety monitoring and control system, the paper indicated that it should make anti-interference design of RS485 bus through aspects of fault insurance circuit, electrical isolation, interface protection of anti-surge over-voltage and communication software programming, and gave implementation of the anti-interference design. The actual application showed that the anti-interference design can ensure stable running of data transmission of coal mine safety monitoring and control system.