Spindleless drive for rolling mill stand - used in high speed wire and light section mill trains

摘要

In a spindle-free drive for roll sets and roll ring stands in high speed wire and light section steel rolling mill trains, in which the roll shafts are mounted in adjustment sleeves and are provided with pinions meshing with side cogs, the novelty is that (i) the transmission ratio between the cogshafts (3,4) and the roll shafts (8,9) is 1:1.2-3; (ii) the axis centres of the adjustment sleeves (6,7) are located in a roll cassette on connection lines (11,12) which are at an acute angle (alpha) to the rolling line (10) and which pass through the axis centres of the cog shafts (3,4) in a drive housing and through the roll shaft axis centres lying in the middle of their adjustment range (beta); (iii) the relation between the eccentricity and the dia. of the roll shafts (8,9) is determined by the established greatest dia. of the adjustment sleeves (6,7); (iv) the axial spacing of the cog shafts (3,4) is the same for different stand sizes; and (v) the drive shafts (2) of stands of all sizes are located at the same distance from the rolling line (10) without use of intermediate stages. ADVANTAGE - The design allows the transmission ratio to be changed to achieve increased roll speed with small dia. roll rings and reduced rotational speed of the cog shafts and allows direct stand size changing.