DEVICE TO REMOVE WORKING ROLLS IN A FOUR-HIGH ROLLING STAND

摘要

Device to remove working rolls in a four-high rolling standcomprising upper working roll (11a) and lower working roll(11b), associated with respective supporting chocks (12a,12b), and relative back-up rolls, upper (13a) and lower(13b), associated with respective supporting chocks (14a,14b), wherein at least the chucks (14b) of the lower back-uproll (13b) laterally and partly contain the chocks (12b) ofthe lower working roll (11b), the device comprising a pairof sliding rails (15) mounted on board the chocks (14b) ofthe lower back-up roll (13b) and movable vertically withrespect thereto, the rails (15) cooperating with liftingmeans and including a first lowered, or inactive position,and a second raised, or working position, associated withthe chocks (12b) of the lower working roll (11b), the chocks(12b) being-associated at the lower part with sliding means(21) suitable to cooperate with the rails (15) located inthe raised position, the means to lift the rails (15)consisting of actuators (23) arranged in cooperation withthe lower plane of the rolling stand (10) and containedinside the space of the chocks (14b) of the lower back-uproll (13b), the actuators (23) being connected to therelative rails (15) by means of respective extension rods(16) arranged an the axial extension of the actuators (23).