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In the steel rolling shop, the roller table is used for longitudinal transport of rolled parts. In hot rolling, the heated billet is generally sent to the rolling mill through the roller table or the rolled pieces rolled out of the rolling mill are sent to the shear machine. On some finishing lines, the longitudinal transport of rolled parts is often carried out by the roller table. Roller table is an important transportation equipment to realize the mechanization of the workshop, and is widely used in all kinds of work lines. The length of the roller table often runs through the entire production line, and the weight of the equipment is large, accounting for 20% to 30% of the total weight of the workshop equipment, and some workshops even reach 40% to 60%. Moreover, the running of the roller table before and after the rolling mill directly affects the output of the rolling mill. Therefore, the correct and reasonable design and maintenance of roller table is of great significance to reduce the weight of workshop equipment and increase the output of rolling mill.
Classification: According to the different nature of the work, the roller table is mainly divided into two categories.
(1) Transport roller The main function of transport roller is to transport rolled parts. For example, Figure 13-1 is a schematic diagram of the roller table layout in a roughing shop of a plant. Among them, the receiving roller 1 is used to receive the ingot delivered by the ingot truck and send it to the ingot rotating table roller 2. As required, the ingot is rotated 180° on the rotating table and sent to blooming Mill 7 through table 2 and input table 3. The rolled pieces from the blooming mill are fed to the shearing machine through the mill output roller 11. The above roller table is used to transport ingot or rolled parts, called the transport roller table.
(2) Working roller table The working roller table is directly arranged before and after the working base of the rolling mill. In Figure 13-1, rollers 4, 5, 6 and 8, 9, 10 placed before and after blooming mill 7 are working rollers. These rollers, in addition to sending the ingot delivered by the input roller to the blooming mill 7 before rolling and the rolled piece to the output roller 11 after rolling, also directly participate in the rolling work, that is, during the rolling process, these rollers also run, so they are called working rollers. Among them, the rollers of table 6 and 8 are directly installed on the blooming mill frame, which is called the frame roll; Rollers 5 and 9 are closest to blooming mill 7, and in each turn of the rolling, they run, called the main working roller; Tables 4 and 10 operate only when the length of the rolled piece exceeds the length of the main working table 5 or 9, which is called the auxiliary working table, also known as the extended table.
(1) Before surfacing welding of the roller table, the metal fatigue layer on the surface of the roller table should be removed by machining method, and the surface after processing should be inspected by non-destructive testing to ensure that there is no crack. For locally deep pits, the process of artificial local repair welding can be used for treatment.
(2) After the surfacing welding is completed, the roller table can be treated as a whole according to the needs, so that the organization of the welding heat affected zone can be transformed into a uniform fine crystal to improve the performance of the welding area.
(3) After the final machining is completed, non-destructive testing should be carried out to ensure that there is no crack. For roller with higher speed, it is also necessary to do dynamic balance test. After repairing the V-shaped roller table, check whether the Angle is correct.
(4) Due to the heat affected zone generated by the material of the roller table during the surfacing welding process, the material becomes brittle and the toughness is reduced. The roller table is easy to break after the toughness is reduced. Therefore, the roller table should not be repaired repeatedly. According to experience, the general number of surfacing welding is controlled within 4 to 5 times.
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