Continuous rolling mill(High stiffness)
Steel rolling, smelting, casting, heating, rolling mill, intermediate frequency furnace, continuous casting machine, heating furnace, roll.
Mechanical structure characteristics of short stress line mill.
The short stress line mill is a kind of high stiffness mill, in the rolling process, the internal force caused by rolling force shortens along the stress loop distribution of each bearing part.
The mill is mainly composed of roll system assembly, roll joint adjustment mechanism, axial adjustment mechanism, pull rod assembly and so on.
Roll system assembly
2 with four short cylindrical bearings, the bearing life is long, large carrying capacity, but four short cylindrical bearings can bear radial force, unable to bear axial force, so it is also a double row angular contact ball bearing is used to bear axial force, as a result of the four columns short cylindrical bearing outer ring is free to emerge, so that the circle can be set on the roll neck, outer ring can be within the first load bearing, to push the bearing on the roll neck with inner ring, and roll bearing assembly becomes a bearing itself from the assembly.
It can be seen from the assembly that the bearing and bearing housing are under good stress, and because the rolling mill has eliminated the pressure screw under concentrated load, it adopts four rows of short cylindrical bearing, which makes the bearing bear uniform stress and reduces the stress, so the bearing life is significantly improved compared with the mill.
Axial adjustment mechanism
The mechanism is connected with a universal coupling through a shaft sleeve for external axial adjustment.
The mechanism is easy to adjust and the structural design is new Ying.
Press down the nut with the spherical gasket
The pressing nut is connected to the housing by a standard screw, that is, the pressing nut cannot rotate with respect to the housing.
When the tie rod rotates, the lower nut drives the bearing seat to rise and fall to realize the adjustment of roll gap.
The pressing nut is under great force in all parts, and it is inconvenient to replace. There is friction between the adjustment and the relative movement of the pull rod screw, so wear resistant materials are selected.
However, compared with the tie rod, the nut material should be slightly inferior to the tie rod material because of its simple manufacture and small volume.
Casting bronze was used for pressing nuts to prevent the extrusion surface from gluing.
The spherical gasket ACTS as a hinge point in conjunction with the pressed nut.
When the pull rod is forced to be aslant due to axial adjustment of bearing housing or installation error, the spherical pad allows a small range of swing of the pull rod to reduce bearing edge load and improve bearing life. The spherical pad should meet the requirements of hardness and surface wear resistance, so 40C rN iM O is selected as the spherical pad material.
5 roll seam adjusting mechanism
The roll gap adjusting mechanism is used to adjust the size of the roll gap.
Because the adjustment stroke is relatively small, and do not need to be adjusted frequently, so the use of manual or hydraulic motor pressure down, the device USES a large transmission ratio of worm gear and worm deceleration, so save effort, compact structure.
Figure 1 as the principle diagram of the roll gap adjustment mechanism, implemented by a set of worm gear and worm drive rod rotation roll gap adjustment, namely four worm wheel engages with a long worm, each worm gear and a lever to roll system key link, the worm shaft is installed on an inner ring gear and gear shaft sleeve two toothed clutch, can press down, at the same time can also be unilateral pressure, selects the tooth profile of spline tooth clutch, the tooth can pass a larger torque and easy for meshing.
After the adjustment of the pressing mechanism, the worm gear and worm transmission mechanism can self-lock.
It can be seen from the roller joint adjusting mechanism that the high precision products are obtained, the rolling waste is reduced, and the mill product yield is increased due to the removal of the pressing screw, further shortening the stress loop, and improving the rigidity of the mill.
The company's production equipment is mainly used in rolling mills, the equipment can produce bar, wire, steel, strip steel, output from 10,000 tons/year to 500,000 tons/year：