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PNJ-II Stemming Machine

The stemming machine is a special equipment for producing the stemming plug. CRAC has researched and developed the stemming machine in order to improve the quality of the stemming plug and construction efficiency in blasting engineering. The PNJ series stemming machines have the advantages of simple structure, small size, light weight and lower energy consumptions with convenient operation and maintenance and efficient production rate. The plug made by this machine has good softness, high density and good plugging effect. The stemming machine had obtained national patent in July 1999, and passed the quality inspection organized by Sichuan  Provincial Product Quality Supervision and Inspection Bureau in August 1999. In August 2000, it had passed the technical evaluation organized by Ministry of Railways, and had won the 3rd prize of Science and Technology Award of China Railway Society in 2003.

. With this product, the required number of boreholes can be reduced by 10% to 15%, the explosive unit consumption can be cut down by about 20%, the drilling tool cost can be saved by 10% to 15% and the advance rate per round can be increased by 4% to 5%, for which the drilling and blasting costs can be saved by RMB 20 to 40 million Yuan every 1km of single-track railway tunnel.

The stemming machine has been widely used in the blasting engineering such as railway, highway, water resources and hydropower, military, mine and city demolition blasting, obtaining good social benefits, economic benefits and environmental benefits with high reputation.

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