Method for accurately eliminating roll gap of three-twisting-point fan-shaped section on line

Abstract

The invention discloses a method for accurately eliminating a roll gap of a three-twisting-point fan-shaped section on line, which comprises the following steps of: before calibration, centering a calibration chain in front of a bottom-mounted dummy ingot chain centering table, and conveying the calibration chain to an inlet of the last fan-shaped section under the driving of a roller way; the method comprises the following steps: carrying out picture operation on an upper computer of a control box beside a machine or an operation room, lifting all roll gaps of a fan-shaped section to be more than 220mm, conveying a calibration chain to a position needing to be calibrated through a driving roll of the fan-shaped section, and adjusting the clamping pressure of a clamping cylinder of a hydraulic system to a required calibration pressure value; in the section to be calibrated, a driving cylinder is lifted up and a clamping cylinder is pressed down one by one, in an online calibration mode, after a display value of a displacement sensor in a standby bypass operation picture is kept still for more than 30 seconds and is not changed, an on-site maintainer confirms that an upper roller and a lower roller of the fan-shaped section are completely contacted and compacted with a calibration chain, and a calibration pressing-down state is kept; a handheld electronic roll gap instrument is used for detecting an actual roll gap value H, the actual roll gap value H is input into a calibration panel beside the machine, a display value can display the actually measured H value, and calibration is completed after confirmation.

Description

technical field [0001] The invention relates to a method for accurately eliminating the gap between roll gaps on-line by a sector-shaped segment of three twist points. Background technique [0002] There are various types of equipment in the sector of continuous casting production line in iron and steel plants. Among them, the light pressing sector is the mainstream direction, and the roll gap of the light pressing sector is the core of its control. Most of the roll gap values ​​are calibrated in the off-line assembly of the sector. Different methods and standards re-calibrate the zero position of the displacement sensor that detects and displays the roll gap, and the triple-point segment is no exception. After these sector equipments run online for a period of time, due to the wear of the contact surface of the roll casting billet, the wear of the bearing force structure, the force deformation of the equipment body, and the deformation of the fasteners, etc., the original o...

AI Technical Summary

Problems solved by technology

[0009] Traditional roll gap calibration method: The traditional online calibration method of the three-twisted point segment generally moves the offline calibration process to online use, and uses a calibration block for calibration. However, due to the small surface contact area between the calibration block and the roller, and the The outlet of the arc section is affected by its own weight. Using the same calibration pressure as offline, the deformation of the calibration block will not be like the 0.2mm in the simulation experiment or in the offline state. The actual change is very large, up to 10mm, or even severely distorted and deformed.

However, the measured gap value and the maximum value of △h that need to be eliminated cannot be measured and realized.

To this end, change the strategy and try to increase the strength and width of the calibration block to meet the needs of online calibration. The effect of offline use is good. Put the calibration block between the upper and lower frame rollers and press down the oil cylinder. Under the measured 12Mpa, all △ The values ​​of h, X1, X2, and X3 can all be detected, and the real H value can be read, but due to the increase in the volume of the calibration block, the weight increases proportionally, and the tight structure of the second cold room in the online fan-shaped section, the narrow space, The vertical height difference of the working surface is large, and it is time-consuming and laborious to manually carry and install the calibration blocks, and there are occupational health hazards and safety risks caused by excessive loads of personnel. This method is only used as an experiment for data integration and cannot meet the online requirements.

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