Support roll bilateral direct transmission gear of four-roll plate and strip rolling mill

Abstract

The invention discloses a support roll bilateral direct transmission gear of a four-roll plate and strip rolling mill. The support roll bilateral direct transmission gear is of a longitudinal and bilateral full-symmetry structure and comprises a base of a framework, an upper cover plate of the framework, four balance cylinders of motors, the four motors, four couplings, two screw-down hydraulic cylinders, four upright columns of the framework, an upper support roll, an upper work roll, two bearing blocks of the upper work roll, two bearing blocks of the upper support roll, two bearing blocks of a lower support roll, two bearing blocks of a lower work roll, the lower support roll and the lower work roll. The support roll bilateral direct transmission gear has the advantages that the service lives of rolls can be prolonged, and the quality of rolled pieces can be improved; the size and the weight of a main transmission system of the rolling mill and the quantity of components of the main transmission system of the rolling mill can be reduced, and the capacity of main motors can be decreased; the transmission system is simplified, the support roll bilateral direct transmission gear is provided with the balance cylinders of the motors, accordingly, torsional vibration can be effectively suppressed, hazards such as fracture of transmission components in overload, impact and torsional vibration states can be prevented, and the rolls and the rolled pieces can be uniformly stressed; the balance cylinders of the motors further can be used as cylinders of bending rolls and are beneficial to improving the quality of plate shapes.

Description

technical field [0001] The invention relates to a transmission device for a strip mill, in particular to a double-sided direct transmission device for backing rolls of a four-roll strip mill. Background technique [0002] The main transmission device of the strip mill is the core component of the strip mill, and its function is to transmit the motion and torque of the motor to the rolls. For a long time, the main transmission system of strip rolling mills such as two-roll, four-roll, six-roll or multi-roll mills has adopted the one-side transmission of the rolls, usually including reducers, gear seats, connecting shafts and couplings. A "mass-spring system" consisting of several inertial and elastic elements. In the production of the main transmission system of the rolling mill, some parts will be damaged. This kind of damage cannot be explained by the calculation of load and strength, but is related to the torsional vibration of the transmission system. When rolling steel...

AI Technical Summary

Problems solved by technology

Due to torsional vibration, the maximum torque value on the connecting shaft is much larger than the static torque value during normal rolling, and its peak torque will cause great stress to each shaft section of the main drive system, or cause a one-time failure of the shaft section damage, or make the stress of the shaft section exceed the fatigue limit and cause fatigue damage. When the stress cycle exceeds a certain number of times, it will cause fatigue damage to the parts, thus affecting normal production

The main hazards of the torsional vibration of the main drive of the strip mill are as follows: ① Cause the fatigue effect of the components of the transmission system, and cause instantaneous damage to the components in severe cases

②Coupled with the vertical vibration of the rolling system of the frame roll system, forming light and dark stripes on the surface of the strip, increasing the thickness error of the strip, and affecting product quality

③Cause marks on the surface of the roll, accelerate the wear of the roll surface, shorten the roll change cycle, and increase the workload and cost of equipment operation and maintenance

All the above schemes have significant technical effects, but the torque transmission efficiency is low, and torsion angle and torsional deformation will be generated in the middle transmission parts, and it will also cause torsional vibration of the rolling mill

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