DEVICE FOR CATCHING BORING PIPES IN ROTOR OF BORING PLANT Russian patent published in 2004 - IPC

FIELD: deep boring technology.

SUBSTANCE: device has body with inserts mounted it along with wedges and bars with saw-like toothed cutting. Wedges bracket is connected to bars. Under-rotor ring is made with upper and lower flanges. Hoisting lever with rollers is in jointed connection to force cylinder, which oscillates on axis in upper cover and mounted on cantilever with traverse in cantilever ring-shaped branching pipe fixed to the rotor. Hoisting lever with rollers is transversely moveable in limited fashion. Also provided is holder of leading pipe. In lower flange of under-rotor ring through grooves are made symmetrically on two sides in area of horizontal displacements of rollers of hoisting lever. On side surfaces of through grooves slanting receiving surfaces are made. Hoisting lever rollers mounting in the middle between flanges of under-rotor ring is performed by interaction of spring-loaded barrel mounted in upper portion of piston with upper cover of force cylinder. Slanting receiving surfaces of through grooves in lower flange of under-rotor ring are made at an angle of no more than 30° to inner plane of lower flange and at height above said plane on side surfaces of through grooves up to beginning of slanting receiving chamfer matching rollers drive of hoisting lever from position during holding of pipe by wedges up to wedges engagement. Spring-loaded barrel of force cylinder piston is made with drive limiter in upper cover of piston, and drive of spring-loaded barrel matches hoisting lever rollers displacement from lower end position to position in the middle between flanges of under-rotor ring. Bars are connected to under-rotor by T-shaped connection with locking finger in lower expanded portion of T-shaped connection, while specific pressures on contact surfaces are provided for, which are not greater than allowed for material of guiding bars and under-rotor.

EFFECT: this allows automatic connection and disconnection of drive to wedge-holding device, automatic mounting of rollers of hoisting lever in the middle between flanges of under-rotor ring during pipe-column rotation on wedges, prevented wear and breakdowns of connections of guiding bars with under-rotor ring due to small specific pressure in contact assemblies, prevented necessity of rotor cantilever use with adjustable skids, lower mass and laboriousness of drive assemblies manufacture.

4 cl, 13 dwg