Inquiry:
It is φ285 over-hang type(cantilever type) mill, driven individually, one block can have two stands, or four stands.
Function: the pre-finishing mill is located after the side-loop, it is 4 stands twist-free, tension-free continuous rolling (there are vertical loop between the stands), it can roll the billet into the desired dimensions and precision as requested by finishing mill.
Features: the pre-finishing mill is consisted of four φ285 stands, it is vertical and horizontal alternately configured. There are vertical loops between the stands. The four φ285 stands are Cantilever roller sleeve type, it has following features:
— the roller box is plug-in type, the stand is consisted of roller boxes and gear boxes.
— the roller box has one flange panel, which is used to be connected with gear box. The roller box has eccentric-sleeve to adjust the roller gap. There are oil film bearings and roller shafts inside the eccentric sleeve. At the roller end of the cantilever, the conic sleeves are used to fix the roller rings. The roller boxes with same structures can be inter-changeable for vertical stands and horizontal stands.
—the gear box of horizontal stands is consisted of entry-shaft and Synchronous gear shaft, also the driving box of the two horizontal stands is the same,the gear reducer is used to adjust the speed ratio.
— the driving mechanism inside the gear box of vertical stands has one pair of spiral bevel gear, which is more than those of the horizontal stands, it is used to change the rotation direction and adjust the speed ratio. Except of this pair of spiral bevel gear, others is same with those of horizontal stands.
— adjustment of roller gap is made by rotating the screw rod, which has left and right screw thread and nuts. By this adjustment of roller gap, it can make the two sets of eccentric sleeves rotating relatively, the distance between the two roller shafts is shifted and change the roller gap, with the the rotating of eccentric sleeves. While at the same time the position of original rolling line and roller guide is not changed.
— the roller ring is connected to the roller shaft of Cantilever by conic sleeve. The roller ring is replaced by special roll replacement tool.
— the vertical stand adopt ground transmission method.
— the vertical loop is pneumatic type (upper loop), it is welded structure, it use the loop scanner to control loop.
Main Technical parameters of pre-finishing mill
Mill type: 4 stands of φ285 Cantilever roller sleeve type
Roll sleeve size:φ285／φ255× 95 /70mm
Roll sleeve material: tungsten carbide
Max rolling force: 280kN
Rolling speed: max 18 m/s
Rotating motor: DC motor
Rotating Speed: 600kW
Rotating speed:600-1500r/min
Technical parameter of vertical loop
Loop height: normal:～100 m
Max: ～400 mm
Control mode: The loop scanner controls the travel, the cylinder controls loop roller
Operation press of air cylinder: 0.4-0.6Mpa
All the gear wheels are hard grinded gears, the precison is machined to be level 5.
ZALO
