Method for non-measuring fast calibration of loop device of finishing mill group and special device

Abstract

The invention relates to a method for non-measuring fast calibration of a loop device of a finishing mill group and a special device, particulary applicable to the calibration of the initial reference loop angles among standers of a finishing mill group of a strip rolling mill, belonging to the technical field of steel rolling. The invention has the scheme that the special device (a loop calibrating block) is manufactured, one unworn position in the different standers is taken as a reference point, and the calibration of different numerical values is carried out by the same loop calibrating block when each loop device is finely rolled, so that a calibration process is completed. The invention has the positive effects that the work stability of the loop device can be improved, the loop angles can be exactly and quickly checked and calibrated, the line rolling operating rate can be effectively improved, and the labor power and material investment when the loop is calibrated can be reduced; and the invention is convenient for workers to calibrate and check the loop angles during normal steel rolling, so that the stability of the loop can be improved, and the invention is good in operability since measurement and calibration can be carried out without a level gauge.

Description

technical field [0001] The invention relates to a non-measurement quick calibration method and a special device for a looper device of a finishing mill, and is particularly suitable for calibrating an initial reference angle of a looper between racks of a finishing mill of a strip mill, and belongs to the technical field of steel rolling. Background technique [0002] In the rolling process of the strip mill, the looper between the stands of the finishing mill is very important. It plays a key role in maintaining the logistics balance between the finishing stands, keeping the tension of the strip constant, adjusting the speed of the rolling mill, and controlling the shape of the strip. Background technology Most of the finishing mills of the hot-rolled strip production line use hydraulic loopers. The actuators of the hydraulic loopers are hydraulic cylinders, which are driven by servo valves. The height of the looper is controlled by controlling the action of the hydraulic cy...

AI Technical Summary

Problems solved by technology

The methods for calibrating the initial angle of the looper in the background technology are mainly divided into the following three types: ①Experiential calibration method: when the reference angle of the looper needs to be calibrated in the production process, it is mainly to rely on experience to judge the angle of the looper by visual inspection, and then estimate the angle of the looper based on experience. Notify the electrical personnel of the angle value, and let the electrical personnel calibrate in the program; due to the large calibration error of this method, this method is not used in the hot-rolled strip production line.

②Standard angle method of positioning pin shaft: After moving the looper to a certain angle, insert the pin shaft into the pin shaft hole of the swing arm of the looper and the fixed bracket and calibrate the reference angle; the disadvantage of this method is the pin shaft and the pin shaft positioning hole There is a gap between them, and as the number of uses increases, the pin shaft and the pin shaft hole will gradually wear and deform, and the gap will gradually increase, resulting in a gradual decrease in the positioning accuracy of the looper and an increase in the deviation

③Precise calibration method of the original looper angle: place the looper device at a certain position, use a level to measure the elevation value of the upper roll surface of the looper roll, adjust the looper device so that the elevation of the upper roll surface of the looper roll coincides with the elevation of the rolling line , the allowable deviation is ±1mm. After finding the correct position, the calibration is completed by modifying the encoder value in the program to calibrate the angle of the looper; the disadvantage is that the calibration process is cumbersome, and professional surveyors are required for surveying and mapping, which requires high quality personnel. In the normal rolling process Among them, the calibration and verification of the angle of the looper has low operability, which reduces the effective operation rate of the equipment

It takes about 40 minutes to calibrate a looper. The level instrument is expensive and the cost of personnel is high.

During the calibration process of the looper, it is necessary to adjust the position of the looper by jogging at any time. The looper controller is in the open state, which is prone to misoperation and poses a serious safety hazard.

The above methods have different shortcomings in the positioning accuracy of the looper, time-consuming, manpower and material resources, which affect the positioning accuracy of the looper, cannot meet various requirements at the same time, and cannot be well adapted to actual production needs.

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