3 kV mining flame proof movable substation was builtf,ilter circuit of high precision and narrow band-pass was designed,and an experiment platform including DSP was founded.

After applying embedded system based on ARM7 into mine-used flameproof feeding switch,real-time data collection and rapid connecting with industrial Ethernet of underground mine-used flameproof feeding switches were (realized.

This paper introduces briefly the demands on and usages of the flameproof enclosure, probes into the methods for re-manufacturing the flameproof enclosure by using the ropey flameproof enclosure as the blank, and analyzes on the benefits of the technique of re-manufacturing the flameproof enclosure.

This article expounds the analysis of causes on the deformation of cylindrical flameproof enclosure,and provides the different welding procedures and measures for the different causes to effectively reduce the deformation.

Against the existing problems in the process of the voltage up-grading for the cylindrical-shaped flame-proof enclosure,on the basis of elasticity mechanics theory,this paper carries out an analysis on the stress distribution of the cylindircal-shaped flameproof enclosure.