Method for improving detecting precision of continuous casting hydraulic fanshaped section roll gap through online roll gap apparatus

Abstract

The invention discloses a method for improving the detecting precision of a continuous casting hydraulic fanshaped section roll gap through an online roll gap apparatus. According to the method, a tong-type online roll gap apparatus is mounted in the middle of a casting machine dummy bar to carry out roll gap detection; before a casting machine starts casting, the roll gap apparatus stops betweenthe bending section and the first fanshaped section of the casting machine, when the hydraulic fanshaped section is detected, upper driving rollers are in depressed state, according to the basic character of the hydraulic fanshaped section roll gap, the roll gap state during the casting process of the hydraulic fanshaped section is simulated to eliminate the gap of the connecting ends of a controlair cylinder of the hydraulic fanshaped section roll gap, the gaps among all hinge joint points on a roll gap control stand column and the centring gap between an upper frame and a lower frame, so that continuous casting machine roll gap measurement values with higher precision are obtained; in addition, through analysis of data contact ratio, direct adjustment of the casting machine roll gap orabnormal roll replacement is realized, so that the online roll gap management problem of the casting machine hydraulic fanshaped section is solved, and convenient and reliable safeguard is provided for quality management and prolonging of the service life of the fanshaped section.

Description

technical field [0001] The invention belongs to the field of casting machine process control, and in particular relates to a method for improving the detection accuracy of an online roll gap meter for continuous casting hydraulic segment roll gaps. Background technique [0002] The roll gap of slab continuous casting is one of the most important parameters of the casting machine, which directly affects the control of quality defects such as central cracks, segregation, triangular area cracks and corner transverse cracks of the slab. Abnormal roll gaps also cause fan-shaped segments, etc. The main factors of casting machine main equipment are low service life, abnormal damage and even serious accidents such as billet stagnation. Since the casting machine is connected by a long series of segment equipment, different segments have different equipment structures and different roll gap control principles. During the production process, the roll gap of the casting machine is affec...

AI Technical Summary

Problems solved by technology

[0009] 1) The equipment structure is complex, difficult to maintain and expensive

For example, the WIEGARD company's roll gap meter often leaks oil from the oil film oil pump supporting the spring plate, causing the expansion spring that maintains the roll gap meter attitude to fail to expand, and the roll gap meter cannot be used; the roll gap meter using the LVDT displacement sensor is The damage of the sensor often occurs during operation; while the clamp-type online roll gap meter using the angle sensor is prone to impact, which may cause deformation of the mechanical spindle, damage to the angle sensor, seal failure, etc. Ten, millions;

[0010] 2) Installation and use are inconvenient, affecting normal production

Testing the casting machine with a roll gap gauge instead of the dummy head type involves a lot of manual operations. It is necessary to replace the dummy head on the dummy bar with a roll gap gauge, and then carry out cyclic detection operations when not in production. In order to prevent damage to the internal instruments and seals of the roll gap meter, it is necessary to carry out forced cooling of the casting machine for a certain period of time. In order to prevent damage to the roll gap meter equipment, some casting machines also need to modify the main control program of the casting machine. Manual operations are required for data reception, etc.

Generally, it takes 2 to 3 hours for a cycle test, which has a great impact on the continuous production characteristics of the casting machine;

[0011] 3) Problems in the detection principle have seriously affected the detection accuracy of the roll gap meter, so that these roll gap meters can only be used as an auxiliary means of roll gap trend management

Since the expansion spring of the roll gap meter that uses the displacement sensor to detect the roll gap can only eliminate the gap between the roller bearings on the relatively fixed segment, but cannot eliminate the frame gap with a larger change, so this type of roll gap meter is actually only suitable for detection Segments of mechanically connected structural roll gaps

Today, when the hydraulic sector is widely used, this type of roll gap meter can only detect the minimum cold roll gap value of the casting machine, but cannot detect the real roll gap value closer to the hot state roll gap, which will instead The tracking and management of casting machine status brings certain blind spots

[0012] The main function of the pliers-type (scissors-type) online roll gap meter represented by Japan Taiping Industry is to detect the mechanical connection structure and the continuous casting roll system is an integral fan-shaped roll gap. In addition to the problem that the measuring arm is easy to be damaged, it is installed between the two chains of the dummy bar (generally at the center of the strand width direction) and close to the dummy head, so it cannot meet the requirements of the roll gap detection of the hydraulic sector

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