Control method for preventing telescopic discharged hot-rolled pipeline steel coils

Abstract

The invention relates to a control method for preventing telescopic discharged hot-rolled pipeline steel coils. The control method comprises the following steps: operating a coiling production line, conveying band steel to a pinch roll and a pinch roll along a roller way, and further conveying to a coiling machine; driving a mandrel to carry out pre-expansion process by a hydraulic driving device before the band steel is conveyed to the position of the mandrel; winding 1.5 circles of band steel on the mandrel to form a steel coil and driving the mandrel to carry out expansion process by the hydraulic driving device; driving a coil discharging trolley to ascend until a carrier roller is contacted with the steel coil by a hydraulic system after the expansion process is finished, so as to carry out coil discharging process; driving the mandrel to perform contraction process by the hydraulic driving device after the carrier roller is contacted with the steel coil; and discharging the steel coil from the mandrel by the coil discharging trolley when the diameter of the mandrel is contracted to be minimum. The control method can ensure that the expanded diameter of the mandrel is reasonable, the coil contact height of the coil discharging trolley is appropriate, the telescopic discharging coil caused by rubbing of the mandrel and the inner wall of the steel coil is thoroughly reduced, the coil discharging operation is enabled to be carried out smoothly and the stable batch pipeline steel production is realized.

Description

technical field

[0001] The invention relates to the technical field of metallurgy, in particular to a control method for preventing hot-rolled pipeline steel from coil unloading. Background technique

[0002] At present, the rolling of pipeline steel has become an important means for major steel mills to expand their products, receive more contract orders, and improve product efficiency. However, due to the high hardness and high strength of pipeline steel itself, it is very difficult for the entire rolling line to roll, especially in the coiling area. Rolling and unloading. Unloading the tower is a difficult problem in the current pipeline steel rolling, which is mainly reflected in the friction between the mandrel and the inner wall of the steel coil, resulting in the shape of the unloading tower. The reasons for the formation are as follows: first, the mandrel cannot be completely expanded twice, resulting in too small a gap between the mandrel and the inner wall; second...

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