Electromagnetic soft contact continuous casting crystallizer

Abstract

The invention relates to a kerf-valving external water-cooled type electromagnetic soft contact continuous casing crystallizer, comprising a kerf copper pipe (1), an upper-section inner water jacket (3), a lower-section inner water jacket (2), an electromagnetic induction coil (4), a shell (8), an upper flange (9) and a lower flange (10), wherein the shell (8), the upper flange (9) and the lower flange (10) constitute a crystallizer assembly structure; the upper-section inner water jacket is made of engineering plastics and is sleeved in the electromagnetic induction coil; a groove (12) is machined on the outer wall of the outer wall surface of the kerf copper pipe along each kerf (5); a high-temperature resisting insulation sheet (11) is inserted into each kerf; bonding glue (120) is coated and filled in the groove; the edge of the inserted tail end of the insulation sheet slightly protrudes out of the bottom plane of the groove; and the high-temperature resisting insulation sheets and the serf copper pipe are fixed by the binding glue. A top rib sealing bar (8) which aims at each kerf is arranged between the outer wall of the kerf copper pipe and the upper-section inner water jacket. The invention has the advantages of strong electromagnetic permeability and safe and reliable cooling water path.

Description

technical field [0001] The invention relates to an electromagnetic soft-contact continuous casting crystallizer, in particular to an electromagnetic soft-contact continuous casting crystallizer with slit and split flaps and external water cooling. Background technique [0002] Electromagnetic soft contact continuous casting is a new continuous casting technology. Its basic principle is to set an electromagnetic induction coil for alternating current outside the mold to excite the electromagnetic field. According to Faraday's law of electromagnetic induction, the time-varying electromagnetic field acts on molten steel and will The eddy current is induced on the surface of the liquid, and the interaction between the electromagnetic field and the eddy current will generate an electromagnetic pressure pointing to the interior of the slab, which offsets part of the static pressure of the molten steel, making the molten steel convex at the meniscus of the mold This widens the infl...

AI Technical Summary

Problems solved by technology

One is the slit split external water-cooled type. This type of crystallizer is very similar to the traditional crystallizer. It also includes copper pipes, inner water jackets and the high-speed-cold water narrow water slit channel formed between them. Its advantage is the ability of electromagnetic permeability Large size, simple design and manufacture, less modification to the existing continuous casting machine, very suitable for electromagnetic soft contact continuous casting; but the disadvantage is that the sealing material and sealing method of the crystallizer slit are particularly demanding. In the prior art, Chinese patents CN200410025660.1, CN200420082457.3, CN200510023268.8 and CN200510023267.3 disclose this type of electromagnetic soft contact crystallizer and its kerf sealing method. These prior art implementations are very difficult and costly, especially in crystallizers. Under the conditions of severe cold and heat changes, there is still the possibility of tearing in the kerf seal, and it is not yet possible to popularize and apply it in large-scale industrial production.

And this type of crystallizer also has a disadvantage that the electromagnetic induction coil is often assembled inside the inner water jacket, resulting in a complicated electrode lead-out structure of the electromagnetic induction coil, and the inside of the electromagnetic induction coil is directly connected to the high pressure in a cold water narrow water slit channel. In contact with high-speed cooling water, the electromagnetic induction coil is easily damaged by the impact of cooling water on its insulation; in addition, the inside of the electromagnetic induction coil generally cannot be processed into an arc shape, resulting in uneven water gaps with the arc surface of the outer wall of the copper pipe, resulting in uneven solidification of the molten steel. Average, resulting in continuous casting production problems

Chinese patent CN200810035078.1 also discloses a sealing method for slits, which has passed the cold-state assessment test, but the on-site production unit and technicians still have doubts about whether there is sealing in the invention. At the same time, the invention also has Difficulty with some cutting operations and construction

This type of crystallizer is similar to the water-cooled copper crucible for suspension smelting. Generally, there is no stainless steel outer jacket similar to the traditional crystallizer. Its cooling depends entirely on the water cooling inside the hollow split body. Because the first cold water is completely isolated from the crystallizer slit , can effectively prevent the safety hazard caused by the mutual penetration of molten steel and cooling water through the slit, and can be said to solve the problem of safety and reliability of the cooling water channel of the electromagnetic soft contact continuous casting mold, but the size of this type of mold is large, and the electromagnetic permeability However, it is greatly reduced, which increases energy consumption, and the design and manufacture of the internal water cooling structure of the crystallizer are difficult, and the cost is more than 10 times higher than that of the traditional crystallizer

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