According to the requirements of Safety Regulations in Coal Mine for full-mechanized coal face, a kind of mine flameproof multifunctional lighting device is designed,which serves the functions of environmental lighting, signal communication and in-situ stop control.

Analyzing the 5 aspects of thread fastener:under stress,working load,permissible stress,factor of rigidity,factor of pretightening and pretightening force,to provide basis for design of thread fastener of I type flameproof electrical apparatus.

This paper indicates resumptively the importance of the application of flameproof gland entry device on the Ex equipments,and gives the safe requirments of its structure and construction.

The entry with rubber sealing ring are widely used in the design of low-voltage flameproof motor.

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.

It is very important that ensures the integral explosion protection safety for the flameproof electrical apparatus by selecting reasonably the cable entry.

This article discusses the construction of cable entry device of flameproof electrical apparatus and gives comparison between new and old China national standards.