On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction

A displacement sensor and soft reduction technology, which is applied in the field of online judgment and early warning of displacement sensor faults under dynamic soft reduction, can solve problems such as the influence of billet quality, high manual labor intensity, and waste of materials, so as to prevent abnormal changes in roll gap, Improving the process control level and improving the effect of product quality

Inactive Publication Date: 2012-02-08
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above measures are all passive measures. When a problem is found, the method of manually closing the sector is adopted to reduce the loss. However, at this time, due to the change of the roll gap, the quality of the slab has been affected.
If the measures are not taken in time, it will cause equipment damage or even production accidents. This method has strict requirements on personnel, high labor intensity, and also causes unnecessary waste of materials.

Method used

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  • On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction
  • On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction
  • On-line fault judgment and early-warning method for displacement sensor based on dynamic soft reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment one: The feedback value of the sector displacement sensor fluctuates.

[0021] The "original number range" is 60,000 units between 0-60,000, and the "use range" is 80% of its "original number range", which is 48,000 units from 6,000 to 54,000; define the displacement sensor in PLC S7-400" "Overtravel Range" is 1% of "Used Range", set "Overtravel Range" to 480 units. When the effective range of the displacement sensor is 275mm, divide 275mm into 60,000 units, that is, the "overtravel range" is 1% of the "use range" 48000, which is 480 units (numerically equal to 2.75mm). The current actual roll gap value of the 7# segment is 43636 (equal to 220mm in value), and the feedback value is abnormal due to the fault of the displacement sensor, and 50181 (equal to 230mm in value) appears. PLC S7-300 feeds back this value to PLC S7-400 according to the original data transmission structure, and PLC S7-400 compares its data with the normal fluctuation value. After logi...

Embodiment 2

[0022] Embodiment two: The feedback value of the segment displacement sensor is zero.

[0023] The "original number range" is 60,000 units between 0-60,000, and the "use range" is 80% of its "original number range", which is 48,000 units from 6,000 to 54,000; define the displacement sensor in PLC S7-400" "Overtravel Range" is 1% of "Used Range", set "Overtravel Range" to 480 units. When the effective range of the displacement sensor is 275mm, divide 275mm into 60,000 units, that is, the "overtravel range" is 1% of the "use range" 48000, which is 480 units (numerically equal to 2.75mm). The current actual roll gap value of the 9# segment is 38749 (equal to 222mm in value). Due to the fault of the displacement sensor, the feedback value is abnormal, and the value of 0 appears. PLC S7-300 feeds back this value to PLC S7-400 according to the original data transmission structure, and PLC S7-400 compares its data with the normal fluctuation value. After logical operation, the dif...

Embodiment 3

[0024] Example 3: The feedback value of the segment displacement sensor remains unchanged.

[0025] The "original number range" is 60,000 units between 0-60,000, and the "use range" is 80% of its "original number range", which is 48,000 units from 6,000 to 54,000; define the displacement sensor in PLC S7-400" "Overtravel range" is 1% of "use range", which is 480 units, and "fine-tuning amount" is 0.3%, which is 160 units. The current actual roll gap value of 9# segment is 38749 (value is equal to 222mm). Due to the failure of the displacement sensor, the feedback value is abnormal, and the feedback value has been maintained at 38749. PLC S7-300 feeds back this value to PLC S7-400 according to the original data transmission structure, and PLC S7-400 compares its data with the normal fluctuation value. After logical operation, the difference between 38749 and 38749 is 0, which is lower than normal The "fine-tuning amount" 160 then judges that the clock line of the displacemen...

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Abstract

The invention relates to an on-line fault judgment and early-warning method for a displacement sensor based on dynamic soft reduction, and belongs to the technical field of continuous casting equipment maintenance in the metallurgical industry. The technical scheme is as follows: operation and judgment are carried out in a central system-roll gap control system PLC (programmable logical controller) S7-400 of a continuous casting machine; and by presetting judgment conditions in advance, the roll gap control system PLCS7-400 judges the fault status of the displacement sensor, sends a signal toan execution mechanism at a sector segment so as to take measures and meanwhile sends early-warning prompt to a continuous-casting master control system. By adopting the method, faults at the sector segment can be pre-warned in advance and on-line fault judgment can be carried out on the displacement sensor, thus effectively preventing abnormal change of the roll gap at the sector segment caused by the faults of the displacement sensor, realizing comprehensive monitoring and automated management of key equipment during the whole continuous casting production process, keeping stable continuouscasting production, improving the process control level and the product quality and creating economic benefit.

Description

technical field [0001] The invention relates to an online judgment and early warning method for a fault of a displacement sensor under dynamic light reduction, and belongs to the technical field of continuous casting equipment maintenance in the metallurgical industry. Background technique [0002] Dynamic soft reduction technology is a technology recognized in the world today that can significantly improve the internal quality of the slab. This technology uses a special reduction at the end of the solidification of the slab to compensate for the shrinkage of the slab. This technology can significantly improve the quality of the slab. The dynamic soft reduction technology adopts the method of controlling the reduction amount of the roll gap of the sector section, directly acts on the shrinkage of the cast slab at different positions along the casting direction, and feedbacks the composition of each sector section by controlling the displacement value of the roll gap of each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/12B22D11/16
Inventor 李贵阳彭兆丰许斌吝章国唐恒国李金波范佳
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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