GAS-DYNAMIC RIPPER Russian patent published in 2003 - IPC

FIELD: mining and construction engineering. SUBSTANCE: invention can be used in gas-dynamic-action rippers for loosening firm and congealed grounds. Proposed gas-dynamic ripper includes hollow rod-type housing kinematically coupled and installed coaxially with discharge bushing with exhaust holes, screw head kinematically coupled with discharge bushing and installed coaxially with said bushing, guide shaft arranged vertically for fastening on frame machine on which bracket is installed for longitudinal displacement and provided with bushings for connection with shaft, cocks to control delivery of compressed gas and pipelines to supply gas from supply source to gas distributing mechanism made in form of main working chamber with hollow shank secured on upper end face of rod housing, ring housing rigidly connected with bracket and accommodating three ring channels in its wall, coaxially installed inner and outer supply tubes, valve installed for limited axial displacement inside discharge bushing for engagement with lower end face of rod housing for communicating ring clearance between rod housing and outer tube with exhaust holes in discharge bushing and provided with control space and inner tube arranged in control space and also spring for pressing valve to lower end face of rod housing. One of ring channels in wall of ring housing communicates through cock with pipeline delivering compressed gas supply source and it communicates through radial channels made in ring housing through inner tube with valve control space. Said valve provides communication of ring clearance between rod housing and outer supply tube with exhaust holes in discharge bushing. Ripper has larger piston installed for axial displacement in main working chamber and provided with concentric stepped holes in larger diameters of which needle valves are installed and springs to press needle valves to concentric holes made in bypass bushing installed in large piston from side of overpiston space. Smaller diameters of stepped concentric holes are made from side of lower end face of large piston for communication with through cocentric holes made in small piston coaxially attached to large piston from side of its lower end face for axial displacement and installed in main working chamber in upper part of inner space of rod housing, in upper end face of which shock absorbing ring is installed to limit downwards travel of large and small pistons, and from side of overpiston space shock absorbing ring is installed in large piston to limit upwards its travel together with small piston. Overpiston space communicates with atmosphere and supply source through gas supply control cock, pipeline, ring channel with radial channels in wall of ring housing, radial channels and inner space in shank. Ring clearance between rod housing and outer supply tube communicates with supply source through cock, pipelines, ring channel with radial channels in wall of ring housing and outer supply tube. EFFECT: increased capacity. 2 cl, 9 dwg