What are the typical features of packaging steel strip rolling mill?

What are the typical features of packaging steel strip rolling mill? Answer: the work of the mill stand points before and after two parts, a reel with insulation furnace, thus can be realized under the thermal state of coiled steel reversible rolling. 's main advantage is in the rolling mill process can greatly reduce the strip temperature drop, therefore, the flexible rolling time can change, can produce various kinds of hot rolled coil, suitable for rolling processing temperature range is relatively narrow less-deformable steel belt, and can adjust temperature, finishing temperature control rolled piece; Second, compared with the tandem mill, the equipment quality is light, cover an area of an area small. The disadvantages of the mill is: ( 1) Product quality is bad. Due to the head and tail rolled strip speed is low, heat faster, so the rolling out of the head and tail thickness deviation of strip steel; Other finishing time is long, the need to control furnace atmosphere, or secondary oxidation of iron, more make the strip surface quality. ( 2) Mill complex operation, roll wear easily, make the roll change frequently, and the mill production capacity is not high, thus affect the extensive use of mill. The mill production process flow and equipment layout as shown in figure 1 4. Slab in continuous furnace heated by high pressure water descaling, then the two roll mill and lodges and four roll with vertical roll universal roughing mill in a certain way of rolling times, respectively, the slab rolling into 10 - thick 20 mm strip in the flying shear machine head to tail, and then feeding belt furnace coiler of four high reversing reversible rolling finishing mill. When the first line of the strip head out after the roll mill, is raised to the left of the lift plate, introduces the head to the left of the take-up reel. Between the reel and mill strip tension is not big. The biggest total tension reel to 30 kn. The first line of a roll, the tail on the left side of the feed rolls down, the entire unit to reverse, the start of the second rolling, where the right of the feed roller and lifting plate is raised, and the strip guide people to the right of the furnace for take-up reel. So on rolling a few, that is, rolling into the coil you need. Because each rolling workpiece end must be through the roll, so each time will be at the beginning to bite into the rolling speed, make it easy to the end of rolled pieces into one reel. After bite, coiler and mill sync up to normal speed, and in every way by the end of the time, have to brake in time, in case the people into the holding furnace tail. Such frequent change of the operating system must rely on the automatic control can be realized, and it also limits the speed increase. General workpiece in the rolling mill 3 - 5 times, after rolling of strip thickness, through transport roller cooling to the coiling temperature, rewinded into coils in finished coiler coil. Mill product thickness range in general is 1. 5 - 10 mm, rolling speed range of 0. 5 - 8. About 15-5 m/s, the annual output 600000 t. And advanced rolling such as rolling mill's annual output can reach more than 1 million t, even up to 2 million t.