Asynchronous rolling mill with a super large diameter ratio and sheet rolling method

An asynchronous rolling mill with a super large diameter ratio, including a rolling mill stand (1), a press-down device (20), a balancing device (21), an upper roll system and an arc-shaped plate device;

• the press-down device (20) includes two pressing hydraulic cylinders (2001);
• the balancing device (21) includes a lower balancing beam (2101), balancing rods (2102), an upper balancing beam (2103), a balancing hydraulic cylinder (2104) and a connecting frame (2105), and two balancing beam rods (2102) are respectively connected with the upper balancing beam (2103) and the lower balancing beam (2101) by pins, and the balancing hydraulic cylinder (2104) is installed on the rolling mill stand (1) through the connecting frame (2105), and two ends of the connecting frame (2105) are provided with guide sleeve to keep the balancing rod (2102) in a vertical state, and an upward force is applied on the upper balancing beam (2103) through the balancing hydraulic cylinder (2104) and the upward force is transmitted to the lower balancing beam (2101) through the balancing rod (2102);
• the upper roll system includes an upper roll (2) and two upper roll bearing seats (3), the two upper roll bearing seats (3) are installed on the rolling mill stand (1), and the two upper roll bearing seats (3) are respectively installed at both ends of the upper roll (2), and the two pressing hydraulic cylinders (2001) in the press-down device (20) act on upper surfaces of the two upper roll bearing seats (3) through spherical spacer (23) respectively, and the two upper roll bearing seats (3) are connected with the lower balancing beam (2101) in the balancing device (21);
• the arc-shaped plate device includes an arc-shaped plate (4) and a drive component, the arc-shaped plate (4) is arranged opposite to the upper roll (2), and the arc-shaped plate (4) and the upper roll (2) are cooperated to roll strips;
• the drive component is installed on the rolling mill stand (1) to drive the arc-shaped plate (4) to move reciprocally;
• the drive component includes a gear (5) and a transmission shaft (6), and the gear (5) is installed on the transmission shaft (6), the transmission shaft (6) is installed on the rolling mill stand (1) through a bearing;
• the arc-shaped plate (4) includes a base plate (401), a cover plate (402) and a rack (403), the base plate (401) and the cover plate (402) are stacked and detachably connected, the rack (403) is welded or integrated with the base plate (401), and the rack (403) is connected to the gear (5);
• the base plate (401) is made of carbon steel or high-strength steel, and the cover plate (402) is made of high-strength steel or wear-resistant steel,
• a plurality of support shafts (7) are symmetrically arranged on the left and right sides of the transmission shaft (6), and the support shafts (7) are slidably fit with the rolling mill stand (1), and a height adjustment mechanism is provided below both ends of the support shaft (7) to adjust the height of the support shaft (7), and the height adjustment mechanism is installed on the rolling mill stand (1), support convexes (404) are symmetrically provided on both sides of the rack (403), the support convexes (404) are fixedly arranged on the base plate (401), and the transmission shaft (6) and support bearings (8) corresponding to the support convexes (404) are provided on the support shafts (7);
• a stabilizing device is provided on both outlet side and inlet side of the rolling mill stand (1) to stabilize the arc-shaped plate (4) during rolling, the stabilizing device includes a stabilizing stand (14), an upper pressing roll (15), a lower pressing roll (16), an upper pressing roll bearing seat (17), and a lower pressing roll bearing seat (18) and a adjusting hydraulic cylinder (19), the upper pressing roll (15) and the lower pressing roll (16) are respectively installed on the upper pressing roll bearing seat (17) and the lower pressing roll bearing seat (18), the upper pressing roll bearing seat (17) and the lower pressing roll bearing seat (18) are slidably fit with the stabilizing stand (14), and the adjusting hydraulic cylinder (19) is provided above the upper pressing roll bearing seat (17) and below the lower pressing roll bearing seat (18), cylinder body of the adjusting hydraulic cylinder (19) is installed on the stabilizing stand (14), and piston rod of the adjusting hydraulic cylinder (19) is connected with the corresponding upper pressing roll bearing seat (17) or the lower pressing roll bearing seat (18), and height and gap between the upper pressing roll (15) and the lower pressing roll (16) can be adjusted by expansion and contraction of the piston rod of the hydraulic cylinder (19) to adapt to the arc-shaped plates (4) with different radii and thicknesses.