A multi-strand multi-length continuous casting slab online fixed-length weighing system

Abstract

The invention discloses an online fixed-length weighing system for multi-stream and multi-length continuous casting slabs. The online fixed-length weighing system is used to accurately measure the weight of each slab, and convert the deviation between the weight and the set weight into a fixed-length Length correction value, by continuously correcting the value of the fixed-length length, the fixed-weight cutting is realized, so that the weight of the slab is controlled within a reasonable range; each flow is equipped with a set of fixed-length weighing devices, and each flow is independent of each other, reducing the flow due to According to the length of different cut-to-length, multiple weighing devices are designed on each flow, and the number of weighing devices depends on the longest cut-to-length required by production; in the multi-flow and multi-size online weighing system A closed-loop control system is adopted. The system has a high degree of automation, stable work, and each stream is independent of each other, reducing the waiting time for billet discharge caused by the number of streams. The weighing process has little impact on production, and the casting billet after conveying the roller table can pass through the weighing roller table smoothly. ,Simple and practical.

Description

technical field [0001] The invention relates to a multi-stream multi-length continuous casting slab online fixed-length weighing system, which belongs to the technical field of continuous casting equipment in the metallurgical industry. Background technique [0002] With the deepening of cost reduction and efficiency increase in the iron and steel industry, the main indicators of rolling mills are to increase the rolling yield, cut-to-length rate and negative difference rate, and the cutting accuracy of billets is a prerequisite for improving rolling indicators. The cutting accuracy of the casting billet is not high, and the excessive length will cause too much residual material after rolling; if it is too short, it will cause an increase in the amount of defective products; Waste and short rejects. At present, the continuous casting machines in most domestic steel mills use fixed length to determine the weight, that is, the fixed length system is used to produce the contin...

AI Technical Summary

Problems solved by technology

The cutting accuracy of the casting billet is not high, and the excessive length will cause too much residual material after rolling; if it is too short, it will cause an increase in the amount of defective products; Waste and Shorts

At present, the continuous casting machines in most domestic steel mills use fixed length to determine the weight, that is, the fixed length system is used to produce the continuous casting slab with the weight required for the next process of steel rolling. Because the casting slab is affected by the crystallizer section and casting speed , often with a large deviation in weight. When the weight of the continuous casting slab is low, the entire slab will be downgraded and scrapped if it is serious; if the weight of the slab is too high, the excess part needs to be cut off to reduce the yield of the slab and increase the cost of the iron and steel enterprise.

Therefore, it is difficult to solve the requirement of the steel rolling system to measure the length according to the set weight only by the length.

Such as utility model patents "Continuous Casting Billet Sizing Device" (Application No.: 98229983.4), "Scaling System for Continuous Casting Machine Cutting Machine" (Application No.: 200920247798.4) and "Volume Method Continuous Casting Slab Fixed Weight Shearing Device" ( CN03264337.3, invention patent "Cross-section integral type continuous casting slab laser vision weight cutting method and weighting device" (application number: 201010585770.9), etc., are to detect the cross-sectional area of ​​the slab and calculate the length of the slab through the integral of the casting speed. Then obtain the slab weight device indirectly, the accuracy is difficult to guarantee the problem

[0003] The Chinese invention patent "Continuous casting slab fixed weight shearing device" (application number: 200710051593.4) ​​is to install the weighing device on the weighing trolley, and the weighing trolley covers N slab streams, that is, the continuous casting of N slab streams. The billet uses the same platform scale, but its shortcoming is that there is only one weighing trolley, which cannot meet the simultaneous weighing of multiple streams. The trolley is fixed and moved laterally by the vertical track beam of the billet track, and weighs billets of different sizes. The device cannot meet the requirements at the same time; the utility model patent "Continuous Casting Billet Online Weighing Device" (Application No.: 200720100706.0) is to position and insert the hollow hanging frame weighing frame into the positioning seat in the roller conveyor when in use, so that the continuous casting billet enters the front , The scale that can be connected in the rear hanging frame can realize the online single weighing of continuous casting slabs. Its disadvantages are: the weighing frame is composed of hanging beams and two hanging frames at the front and rear. At the same time, it meets the requirements of multi-length cutting of slabs, such as meeting the weighing requirements of 12m slabs but not 6m slabs. There is no hot slab detection device, the weighing cannot be automatically controlled, and the hanging beam equipment is complicated. The front and rear hanging frames may be unbalanced, which affects the weighing accuracy; the utility model patent "continuous casting slab weight cutting device" (application number: 200820230846.4) includes weighing mechanism, computer processing system and casting slab weight cutting mechanism, computer processing system and Electrical connection between the weighing mechanism and the slab weight cutting mechanism

This structure realizes the fixed weight cutting of the billet, but its disadvantages are: it cannot meet the requirements of different fixed lengths of the billet, and the degree of weighing automation is low; the utility model patent "on-line automatic weighing device for continuous casting billet" (Application No.: 201220430492.4) includes roller beam, lifting hydraulic cylinder, idler, tray, pull rod, sensor, bracket and weighing platform. The signal output terminal of the sensor is connected to the weighing computer processing device. The disadvantages are: the weighing device is a lifting type with complex structure and inconvenient maintenance. The weighing device is under the casting slab, which is easily affected by heat radiation and casting slab falling off. Oxidized iron scale erosion, low service life, the weighing process relies on the hydraulic cylinder supporting the roller table, connected with the roller table and the casting slab to lift and weigh, the casting slab behind the roller table will not be able to pass through the roller table

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