PROCESS FOR PREPARING A MIXTURE OF STONE DUST WITH AIR FOR DUSTING EXCAVATIONS AND EXCAVATIONS STONE-DUSTER

摘要

The method involves the simultaneous supply into the mixing chamber (4) of stone dust and compressed air and the discharge of ready to use mixture. Stone dust from the hopper (3) is fed into the mixing chamber (4) by means of a horizontal screw feeder (2) through the inlet hole (28) with the flap valve (32). The mixing chamber (4) comprises a substantially vertical front wall (21), a substantially vertical rear wall (9) and side walls (22) parting from the bottom to the top. Compressed air is fed to the mixing chamber (4) through single inlet hole (29) situated in the lower part of the rear wall (9) of the mixing chamber (4). Screw feeder (2) has a screw (7) with a substantially constant outer diameter (D3) and inner diameter (D2), and with constant helix angle, which rotates in a horizontal tube guide (8) fixed to the rear wall (9) of the mixing chamber (4). The stone dust inlet hole (28) there is in the rear wall (9) of the mixing chamber (4) above the compressed air inlet hole (29). The surface area of the stone dust inlet hole (28) ranges from 30 to 43% of the cross-sectional area of the tube guide (8) of the screw feeder (2). The ready to use mixture of stone dust with air is discharged from the mixing chamber (4) via outlet (25) situated in the lower part of the front wall (21) opposite the of compressed air inlet hole (29).