(12) PATENT (11) Application No. AU 200020702 B2 (19) AUSTRALIAN PATENT OFFICE (10) Patent No. 738669 (54) Title An apparatus for sucking dust by spraying high-pressure water in a sublevel caving hydraulic support for sublevel caving hydraulic support (51) 7 International Patent Classification(s) E21F 005/02 (21) Application No: 200020702 (22) Application Date: 2000.03.07 Priority Data (31) Number (32) Date (33) Country 99246741 1999.10.19 CN (43) Publication Date: 2001.04.26 (43) Publication Journal Date 2001.04.26 (44) Accepted Journal Date 2001.09.20 (71) Applicant(s) Yankuang Group Corporation (72) Inventor(s) Tao Tingyun; Jiang Xueyun; Jing Tai (74) Agent/Attorney DAVIES COLLISON CAVE,GPO Box 3876,SYDNEY NSW 2001 (56) Related Art AU 70251/81 EP 46455 -4 ABSTRACT An apparatus for sucking dust by spraying high-pressure water in a sublevel caving hydraulic suport can be used for' spraying and dust suppression located between sublevel caving hydraulic supports and near the caved coal door. The high- pressure water suction dust apparatus consists of a spraying pipe, a nozzle centred in the spraying pipe at the rear of spraying pipe, S.i and the pipe for sucking dust connected to the rear end of the spraying pipe. The pipe for sucking dust may be a straight pipe oooo or a U-shape pipe. Slot for sucking dusts are prouided on the wall of the straight pipe for sucking dust.The straight pipe for "go. ooo* sucking dust is connected to the spraying pipe to form the dust cleaner located between the sublevel caving hydraulic supports. The U-shape pipe for sucking dust is a U-shape bend pipe, which g is connected to the spraying pipe to form the dust cleaner located near the caved coal door. High-pressure water is spraied through a nozzole to suppress dust and causes a negative-pressure at the rear end of the spraying pipe to suck in dust. The apparatus for sucking dust by spraying high-pressure water in a sublevel caving hydraulic suport has the advantages of small volume, less water consumption, lower water pressure and better dust suppression results.