Method for identifying and monitoring slippage of engagement of strip head into frame during finish rolling of hot rolled strip

Abstract

The invention provides a method for identifying and monitoring the slippage of the engagement of a strip head into a frame during the finish rolling of a hot rolled strip. The method is implemented by a computer real-time monitoring system and includes determining the strip position by means of electrical tracking signals to make the strip head reach to a first finish rolling frame; determining the flying shear slippage; determining the slippage if the running speed of a pinch roll contacted with the strip is zero, and then stopping the strip; and determining based on the pinch roll speed change condition and continuous time: the strip normally runs if the running speed of the strip in the pinch roll is between an upper limit value and a lower limit value, slippage occurs if the strip running speed is lower than the normally set lower limit value, and the computer system performs alarm display when the slippage continuous time exceeds the tolerable threshold value. The computer system gives a determination on the slippage, calculates the slippage time in real time, outputs alarm information, automatically stops steel feeding when a condition is satisfied, and prevents the accident extension.

Description

technical field [0001] The invention relates to a monitoring method during finish rolling of hot-rolled strip steel, in particular to a method for identifying and monitoring the slipping of the head of the strip steel biting into the stand during the finish rolling of hot-rolled strip steel. Background technique [0002] like figure 1 As shown, the layout of the existing hot rolling production line includes: walking heating furnace 1, rough rolling unit 2, optimized shearing system 3, four-link flying shear 4, descaling box 5, finishing rolling mill 6 , laminar flow cooling equipment 7, coiler 8; the corresponding hot rolling process generally includes processes such as heating, rough rolling, finishing rolling, and coiling. First, according to the rolling plan, the steel slabs 50' are loaded into the walking heating furnace 1 in sequence. After the slab 50' is heated to the target temperature specified by the process, it is transported to the rough rolling unit 2. After ...

AI Technical Summary

Problems solved by technology

The strip stops before the rolling mill due to slippage, such as image 3 As shown, the descaling water of 1# descaling header 53 in the descaling box, the descaling water of 2# descaling header 55 in the descaling box, and the cooling water 57 in front of the frame will cause the local temperature of the strip to drop suddenly to form Cold spots, problems such as sheathing, steel drawing, and size out-of-tolerance may occur in the subsequent rolling process, which can easily lead to breakage and scrap steel accidents

[0005] At present, the identification and judgment method of the strip steel head biting into the frame slippage is based on operation observation, so there are the following disadvantages: low detection degree: it is difficult to find the slippage, and the slippage time cannot be judged; the reliability is poor, that is, misjudgment is easy to occur, resulting in intervention lag Or transitional intervention; potential risk is high: slipping is not found after steel is very likely to be scrapped

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