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Device and method for detecting and controlling liquid level of molten pool in double-roller thin-strip vibration cast rolling

A twin-roll thin strip and molten pool technology, applied in the field of casting and rolling, can solve problems such as breakout, long residence time of molten metal, and damage to casting roll equipment

Active Publication Date: 2021-08-17
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the liquid level fluctuates too much, it may even cause rolling jams and steel leakage accidents in the casting and rolling process, resulting in damage to expensive casting rolls or other equipment, so real-time monitoring and control is required
At present, eddy current sensors and X-ray sensors are often used in the detection of molten steel level in traditional slab continuous casting machines, but these devices cannot be used due to the detection environment of thin strip casting and the limitation of installation space; Above, after calculating the liquid level width of the molten pool by measuring the CCD detection system, the liquid level height of the molten pool is calculated, but in this method, the installation position of the CCD camera is too close to the high-temperature molten pool, which may easily cause equipment damage, and due to the vibration of the casting roll , the liquid level width of the molten pool cannot accurately reflect the liquid level height of the molten pool; the research on the existing liquid level control methods of the molten pool found that most of them are to control the liquid level height by controlling the outlet volume of the tundish, but this method It is not applicable when the liquid level of the molten pool is too high or too low. When the liquid level of the molten pool is too high, the roll speed is constant, and the molten metal stays in the molten pool for a long time, which increases the solidification of the molten metal and causes steel jamming accidents. When the pool liquid level is too low, it is easy to leak steel

Method used

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  • Device and method for detecting and controlling liquid level of molten pool in double-roller thin-strip vibration cast rolling
  • Device and method for detecting and controlling liquid level of molten pool in double-roller thin-strip vibration cast rolling

Examples

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Embodiment 1

[0040] Such as Figure 1~2 As shown, a device for detecting and controlling the molten pool liquid level in vibratory casting of a twin-roll thin strip includes side sealing plates 2 arranged at both ends of the casting roll group 1, and the casting roll group 1 includes vibrating rolls 11 and non-vibrating rolls 12. The roll gap between the non-vibrating roll 12 and the vibrating roll 11 forms a molten pool 3, the inner upper edge line of the side sealing plate 2 is horizontal, and above the molten pool 3 there is a camera for the The CCD camera 4 of molten pool liquid level; The CCD camera 4 is connected with the image acquisition card 5, and the image acquisition card 5 is connected with the main control computer 6, and the image acquisition card 5 is installed on the main control computer 6 , the main control computer 6 is connected to the PLC system 7, and the PLC system 7 is connected to the actuator, the actuator includes a displacement motor 9 for adjusting the flow ra...

Embodiment 2

[0045] Such as Figure 1~2 As shown, the present invention also discloses a method for detecting and controlling the molten pool liquid level by twin-roll thin strip vibratory casting and rolling, which includes the following steps:

[0046] S1: Install each device to the corresponding position, pre-adjust the CCD camera 4, adjust the focal length to ensure that the image is clear, measure and record the vertical distance H from the inner upper edge of the side sealing plate 2 to the axis centerline of the non-vibration casting roll 12 with a tape measure;

[0047] S2: Set the lowest value L and the highest value T of the feasibility range of the liquid level of the molten pool 3; the feasible range of the liquid level of the molten pool refers to the range in which the quality of the produced plates can be guaranteed; at the set liquid level of the molten pool The best feasible value M is set between the lowest value L and the highest value T of the feasible range; the best f...

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Abstract

The invention provides a device and method for detecting and controlling the liquid level of a molten pool in double-roller thin-strip vibration cast rolling. The device comprises side sealing plates arranged at the two ends of a casting roller set, the molten pool is defined by a roller gap of the casting roller set, and a CCD camera is arranged above the molten pool; the CCD camera is connected with an image acquisition card, the image acquisition card is connected with a main control computer, the main control computer is connected with a PLC system, the PLC system is connected with an executive element, and the executive element comprises a displacement motor for adjusting the flow of a tundish and a roller driving motor for driving a vibration roller and a non-vibration roller to rotate; and the PLC system adjusts the roller driving motor and the displacement motor to stabilize the liquid level of the molten pool according to adjusting parameters. According to the device and method, damage or failure of sensing equipment under the high-temperature severe working condition is avoided, safety is higher, and a proper control strategy can be selected according to the actually detected liquid level of the molten pool to cope with extreme working conditions such as a too high or too low liquid level of the molten pool.

Description

technical field [0001] The invention relates to the technical field of casting and rolling, in particular to a device and method for detecting and controlling the liquid level of a molten pool by twin-roll thin strip vibration casting and rolling, and in particular to a machine vision-based twin-roll thin strip vibration casting and rolling molten pool Liquid level detection device and control method. Background technique [0002] Twin-roll strip casting is the shortest hot-rolled strip production technology in the world today, which greatly shortens the product manufacturing and delivery cycle. It is a green production process that saves resources, low energy consumption, low Due to the natural advantages of emission, environmental friendliness, low investment and low operating cost, it has attracted extensive attention from the world's steel industry. [0003] In the research on the key technology of thin strip casting and rolling industrialization, the detection and cont...

Claims

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Application Information

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IPC IPC(8): B22D11/06B22D11/18
CPCB22D11/0622B22D11/185
Inventor 许志强郑雪松杨庭松周昊男刘家杨陈立凯
Owner YANSHAN UNIV