DRIVE UNIT FOR PILGER TUBE COLD ROLLING MILL Russian patent published in 2006 - IPC B21B21/00 B21B35/06 

FIELD: improved designs of drive un its for pilger tube cold rolling mills, possibly used in any mills with stand performing reciprocation motion.

SUBSTANCE: drive unit of mill for cold pilger rolling of tubes includes mounted in casing planetary gear-crank unit with vertical rotation axis and with crank-up pin performing straight reciprocation motion and supporting rolling bearing assembly; tie rod joining crank-up pin carrying movable cassette with working rolls and balancing weights. One of said weights is arranged on shaft of crank and other weight is mounted in planetary gear-crank unit. Drive unit also includes additional casing mounted on rolling bearing assembly and second tie rod. One ends of both tie rods are rigidly secured to additional casing; their other ends are coupled with movable cassette carrying working rolls. Additional casing is arranged lower than guide mounted along rolling process axis. Rolling bearing assembly of crank-up pin is spherical. Tie rods are mounted at both sides of said spherical bearing assembly in plane parallel to rolling axis. Balancing weight mounted in shaft of crank is arranged under tie rods and guide over casing that houses planetary gear-crank unit.

EFFECT: improved operational reliability, increased useful life period of drive unit due to its lowered loads.

3 dwg