DRILLING DEVICE FOR PLANTS WITH WORM-LIKE WORKING TOOL Russian patent published in 2005 - IPC

FIELD: mining industry.

SUBSTANCE: device has pressing blocks of saddle-like shape, each of which is spring-loaded relatively to rotation levers with axes via springs and is freely mounted at rotation levers with their possible rotation during wear of spiral of worm working tool along diameter, without displacement of the latter from drilling axis, for certain angle around fixing axes for pressing blocks, placed in parallel to longitudinal axis of drilling device, levers rotating drive, centering rollers, fixed at ends of pressing blocks by axes in parallel to longitudinal axis of drilling device. At ends of pressing blocks grooves are made, radially directed to longitudinal axis of drilling device, wherein resilient inserts are placed, pressing axes of centering rollers in direction of longitudinal axis of drilling device. Axes of centering rollers are made with possible displacement along grooves. Rigidity of springs of pressing blocks is not greater than rigidity of resilient inserts.

EFFECT: higher efficiency.

3 dwg