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It is a supporting equipment for tropical steel rolling mill, which can be divided into two types: ground type and underground type. The underground type is the most commonly used, and this type of coiler is located under the working roller table, so it is called the underground type coiler. Its characteristics: poor working conditions, in continuous alternating operation, fast production pace. Structure: It is composed of pinch roller, front and back guide rule, guide plate, coiling roller and drum.
Underground coiler for hot strip rolling mill
The drum can achieve expansion and contraction under high pressure, and it must have sufficient strength and stiffness. There should be auxiliary supports to increase stiffness. Generally, an inclined wedge type inclined plunger is used. When the hydraulic cylinder (or the reset spring) makes the conical mandrel shift to the left, the inclined effect makes the reel open, and conversely, the reel shrinks.
Generally a reel type, mainly by the expansion of the reel and the transmission device, the reel is equipped with a belt coiler or pliers. In order to improve the rolling conditions, improve the shape of the plate, the winding must have a certain tension. According to the size of the tension, it can be divided into: the high tension coiler on the rolling and smoothing line and the coiler on the finishing line (annealing, pickling, coating line). Its drum is mostly pyramid, arch block type, but also useful solid drum.
1, solid drum coiler: its structure is the simplest, the stiffness is large, can be subjected to large tension; But can not expand and shrink, so can not unroll.
2, four pyramid coiler: used for 20 roll 1180 mill. It consists of four sector blocks, four pyramid (α =7o 45) and expansion and contraction hydraulic cylinder. The hydraulic oil enters the hydraulic cylinder through the rotary joint at the left end so that the expansion and contraction of the hydraulic cylinder move right and the pyramid axis shift right at the same time. Four bevels on the cone shaft lift the sector plate radially. The left shift of the pyramid axis can realize the contraction of the drum. A clamp is arranged on the surface of the drum to fix the strip head.
3, Octagonal cone coiler: In order to improve the quality of strip steel coiler, so that the drum expanded into a whole circle, the development of octagonal cone coiler. The sector block cone Angle: α =12o 45, insert cone Angle: α =16o 4351; The purpose of adding the insert is to fill the gap between the sector pieces so that the roll is a full circle whether it opens or shrinks.
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