Online sizing and weighing system for multi-flow multi-sizing continuous casting slab

Abstract

The invention discloses an online sizing and weighing system for a multi-flow multi-sizing continuous casting slab. The online sizing and weighing system is adopted, the weight of each casting slab is measured precisely, the weight and the part of which the weight deviation is set are converted into a sizing length modification valve, the sizing length value is amended continuously, fixed-weight cutting is achieved, and the weight of the casting slab is controlled in a reasonable range; a sizing and weighing device set is arranged on each flow, all flows are independent mutually, and the ejection waiting time caused by the flow amount is shortened; according to different sizing lengths, a plurality of weighing devices are arranged on each flow, and the number of the weighing device depends on the longest sizing required by production; a closed-loop control system is adopted for the multi-flow multi-sizing online sizing system. The system is high in automatic degree and stable to work, all the flows are independent mutually, the ejection waiting time caused by the flow amount is shortened, the influence of the weighing process on the production is small, the casting slab after passing through a roll gang can pass through the weighing roller way smoothly, and the system is 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 for 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 conti...

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), "Continuous Casting Machine Cutting Machine Sizing System" (Application No.: 200920247798.4) and "Volume Method Continuous Casting Slab Fixed Weight Shearing Device" ( CN03264337.3, the invention patent "Cross Section Integral Continuous Casting Billet Laser Vision Fixed Weight Cutting Method and Fixed Weight Device" (application number: 201010585770.9), etc., is to detect the cross-sectional area of ​​the billet and calculate the length of the billet 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 strands of slab, that is, the continuous flow of N strands of slab. 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 be satisfied at the same time; the utility model patent "on-line weighing device for continuous casting slabs" (application number: 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 slabs enter 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 constant weight cutting device" (application number: 200820230846.4) includes weighing mechanism, computer processing system and casting slab constant 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 beams, lifting hydraulic cylinders, rollers, trays, pull rods, sensors, brackets 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

Images