THREE-ROLL STAND OF HELOCAL ROLLING MILL Russian patent published in 1995 - IPC

FIELD: rolled tube production. SUBSTANCE: three-roll stand has the frame with the cover, three working rolls, arranged along a circle and mutually spaced by an angle, equal to 120 degrees, and mounted on rotary drums. One of the drums is mounted in a window of the cover. Two other drums are arranged in turnings between the frame and the cover. The stand also has screw-down mechanisms for lengthwise motion of the rotary drums, two mechanical screwdown units of the drum with the working roll and a drive unit for their motion. Both mechanical screwdown units are mounted for moving the drums with working rolls, arranged in the turnings between the frame and the cover. The drive of these screw-down units are mounted on the frame. Sleeves are also mounted in the frame oif the stand with use of bearings assemblies. Nuts of the screw-down mechanisms are mounted inside of the sleeves. Double-arm levers are secured to ends of the sleeves. The arms of the levers extend at both sides of the stand. One of the arm is jointly connected with the drive unit. A stroke limiting stopper is mounted opposite to the other arm. The drive units and the stroke limiting stoppers are mounted in the frame. EFFECT: enhanced structure of the stand. 1 cl, 9 dwg