The main parameters of the roller table

The main parameters of the roller table are: the diameter of the roller, the length of the roller body, the distance between the two adjacent rollers, the speed of the roller table and the total length of the roller table.

(1) Diameter of roller. In order to reduce the mass of the roll and the flywheel torque, the diameter of the roll should be selected as small as possible. The smaller diameter of the roll is mainly determined by the strength conditions of the roll. When the rolled part needs to move laterally on the roll, it is also limited by the external size of the bearing seat and the transmission mechanism. Table 5-1 shows the diameters of rolls used in general rolling mills.

(2) Length of roll body. The length of the roller body depends on the use of the roller table, and the length of the roll body of the main working roller is generally equal to the length of the roll body, but sometimes it is longer. For example, blooming mills and some billet machines, in order to install the guide of the push bed, the roll body is made longer. The auxiliary work roller body length of the profile mill is generally short, and as a rolling piece, the auxiliary work roller table is only needed in the later rolling stages. The auxiliary working table on a plate mill has the same length as the main working table.

The length of the roller body of the transport roller should be 150-250mm larger than the larger width of the rolled piece during transportation, and the narrow rolled piece should be 150-250mm and the wide rolled piece should be 200-250mm. If the roller table needs to transport several rolled pieces side by side at the same time, it should be considered according to the sum of the width of these rolled pieces. For example, when transporting high temperature ingot, in order to reduce the radiant heat received by the roller bearing, the length of the roller roll body is 300~500mm larger than the larger width of the ingot.

(3) Roll distance. When transporting short rolled parts, in order to ensure that the rolled parts are placed on at least two rollers at the same time, the roller distance of the roller table should not be greater than the distance between the center of gravity of the ingot and the end face of the big head. Otherwise, the rolled part will impact the roller during transportation, accelerating the wear and tear of the roller and the damage of the bearing.

When transporting long rolled parts, the larger roll distance is limited by the condition of bending caused by the rolling part's own weight, so the roll distance should be selected smaller for the thin output roller table of the finished rolled part. For large rolling mills, generally 1.2-1.6m; Plate rolling mill is 0.9 ~ 1.0m; The sheet mill is 0.5-0.7m. Sometimes there are idling rolls of smaller diameter between the drive rolls of these rollers.

(4) Roller table speed. The working speed of the working roller table is usually selected according to the rolling speed. When the rolling piece is thin and long, the working roller table speed after the rolling mill is 5% to 10% larger than the rolling speed to avoid wrinkles.

The speed of the transport roller table shall be determined according to the requirements of the mill productivity. The input roller of the mill is generally 1.5-2.5m /s, and the speed of the output roller of the mill is equal to or greater than 5% to 10% of the rolling speed. With the increase of rolling speed, the roller table speed increases accordingly. For example, the transport roller table of the steel plate hot continuous rolling workshop has reached a speed of 15-20m /s.

(5) Total length of roller table. According to the production process to decide.