Abstract: In order to solve the problems of high manual charging intensity,low operation efficiency and poor safety when using packaged explosives in underground roadways excavation blasting,a modular onsite mixed emulsion explosive charging device is developed,the end sensitization device is designed,the sensitization technology research at different times is carried out,and the way of using on-site mixed emulsion explosives to realize smooth blasting is explored.The results show that the charging accuracy of modular charging device is controlled within ±1.5%,which is well adapted to the characteristics of low single hole charge.Using the end sensitization technology and different concentrations of sensitizers,the explosive density is stable and controllable.The modular charging device is integrated into the chassis of the engineering vehicle,the charging efficiency is increased by 2.4 times through the wireless terminal control system,and the blasting effect is good.At the same time,the performance of the smooth blasting technology of on-site mixed charging explosives has been preliminarily verified,and the whole set of technology can well replace the traditional blasting operation mode of packaged explosives.

Key words: modular charging device,on-site mixed emulsion explosive,roadway excavation blasting,smooth blasting