The rolling mill is a device that implements the metal rolling process. It refers to the equipment that completes the whole process of rolling material production, including main equipment, auxiliary equipment, lifting transportation equipment and auxiliary equipment. However, the so-called rolling mills are often referred to only as the main equipment.

The working frame is composed of rolls, roll bearings, rolling mill guides, rolling mill housing frame, roll seats, roll adjusting devices, upper roll balancing devices and roll changing devices. Bearing series rolling mills generally use rolling mill bearings, commonly used four-row cylindrical roller bearings, installed in the roll neck of the rolling mill frame. The bearings used on the drums are usually subjected to radial loads by cylindrical roller bearings, deep groove ball bearings or angular contact ball bearings, or tapered roller bearings with radial design or thrust design, which are mostly subjected to axial lubrication. Oil mist lubrication is used to lubricate the bearings, which improves the efficiency and stability of the mill in the production line.

The lubrication of the bearing series rolling mill is basically the same as that of other rolling bearings. However, the working conditions of the rolling bearing are relatively bad, and the effective performance of the working performance depends largely on the lubrication of the bearing. The lubrication methods used for roll bearings are mainly grease lubrication and oil lubrication.

250 rolling mill, the diameter of whose rolls is 235-275 mm. The roll head has a diameter of 150 mm and the roll face length is 500-700 mm. The maximum feed is 60*60. The rolling mill is mainly used for rolling small bars and adopts a three-roll working machine base. The main row of the rolling mill consists of three basic parts: the motor, the transmission and the actuator. The configuration adopted is electric motor - reducer - gear base - rolling mill. The rolling mill reducer adopts ZD60-ZD70 type with a center distance of 600-700mm. Since the steering and rotational speed of the rolls are irreversible, the prime mover uses a high-speed AC main motor with a lower cost.

Considering that the rolling load is uneven, in order to balance the motor load and reduce the capacity of the motor, a flywheel is added between the speed reducer and the motor. Gear base: Its purpose is to transmit torque to the work roll. The design uses three cylindrical herringbone gears of equal diameter to be arranged in a row in the vertical plane and enclosed in a closed box. Coupling: A safety coupling is used between the gear unit and the gear housing. The plum coupling shaft coupling used in the main coupling.