MILL FOR MANUFACTURING FINNED TUBES BY HIGH-FREQUENCY WELDING Russian patent published in 1996 - IPC

FIELD: welding, particularly, production of finned tubes by high-frequency welding in machine engineering, for example, in boiler building, chemical machine engineering, ship-building upon at production of heating surfaces. SUBSTANCE: mill is provided with mechanism for additional straightening of curvature in horizontal and vertical planes at continuous manufacturing process upon making finned tubes and also by mechanism for straightening helical bending of articles. Transportation system is in the form of multiroll stands, roller-type straightening machine and its truck for separating tubes according to non-welded butts, such equipment is provided with drive units for synchronous feed of articles in the welding process with predetermined speed and for accelerated motion of truck of the above-mentioned machine for separating tubes according to non-welded butts at returning of the truck to its initial position. Multiroll stands are mounted in front of, behind and between welding apparatuses. Rolls of multiroll stands are multigrooved and may be mounted with matching of each groove and axis of welded product. Roller-type straightening machine is in the form of housing with guides supporting movable along straightening process direction identical bodies with straightening rollers joined by cone transmission and cardan shaft with rotation drive unit. Each body is connected with drive unit for its discrete feed along straightening process direction has the form of screw-nut pair rotated by power cylinder with the use of controllable friction coupling. EFFECT: improved design. 1 cl, 8 dwg