Crystallizer with the double-water-jacket structure

Abstract

The invention discloses a crystallizer with the double-water-jacket structure. The crystallizer comprises a tubular main body, an external water jacket and a two-part water jacket; the external waterjacket is arranged outside the tubular main body, and the two-part water jackets are embedded between the tubular main body and the external water jacket; hard particles are arranged on the lower portion of the tubular water jacket, longitudinal grooves with different depths and widths are longitudinally machined in the periphery of the tubular water jacket, and a gap is formed between the inner cavity of the external water jacket and the top surface of each rib; the circumferential dimension of the external frame of the two-part water jacket is consistent with the front height of the ribs; agap is reserved between the inner cavity of the two-part water jacket and the rib and is fixedly connected with the tubular main body through a fastener, the two-part water jacket are located in the range of 50 mm above the liquid level of the metal to 150-250 mm below the liquid level of the metal liquid level, and the rigidity of the material is higher than the rigidity of the material of the tubular body. According to the crystallizer with the double-water-jacket structure, the flow speed of the cooling liquid in the two-part water jacket can be accelerated, the requirement for meeting thechange of the heat exchange strength between the shell and the crystallizer is met, the deformation resistance of the tubular main body is improved, the drawing speed is increased, and the quality ofthe casting blank is also improved.

Description

technical field [0001] The invention relates to a crystallizer with a double water jacket structure, in particular to a crystallizer for continuous casting of long metal products of large and small billets, and belongs to the technical field of continuous casting in the iron and steel metallurgical machinery industry. Background technique [0002] During the metal solidification process of square, rectangular and polygonal cross-section billets in the metallurgical continuous casting industry, after the liquid metal is poured into the copper tube of the crystallizer, under the action of the external cooling water of the copper tube, it gradually crystallizes and solidifies along the inner wall of the crystallizer to form a billet shell and Solidification shrinkage occurs, because the metal in the corner area of ​​the crystallizer is cooled by the adjacent two copper tubes, its cooling strength is greater than that of the edge, which will lead to temperature differences betwee...

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Problems solved by technology

For example: the Chinese patent "Mold for Continuous Casting" (CN103328130 A) is to process the cooling channel on the thickness of the side wall to achieve uniform heat exchange of the billet, and to reduce the thickness of the cooling body near the liquid metal surface. Strengthening the heat exchange strength at this position can effectively solve the above-mentioned problem, but the method of drilling holes on the side wall thickness requires the wall thickness to meet certain requirements, and drilling holes on the wall thickness with a certain radian, its The processing is difficult, which leads to high implementation costs and is difficult to be widely used; the Chinese invention patent "Mold for continuous casting and its production method" (CN105473253A) uses the outer wall of the copper tube to process multiple longitudinal grooves, and on the outer surface Wrap multiple layers of fiber material such as resin or fiberglass or cover adhesive to achieve a uniform cooling effect on the copper tube. Although this technical solution solves the problem of increased heat exchange strength between the billet and the copper tube, it does not consider To improve the heat exchange efficiency of the copper tube by enhancing the heat exchange intensity between the copper tube and water at this position; and as described in the Chinese invention patent "hyperbolic crystallizer copper tube" (201110324670.5), the crystallizer is used The taper curve of the inner cavity is a hyperbola, and the taper curves of the four surfaces are all hyperbolas. At the same time, there is a large curve gradient near the meniscus in order to better meet the requirements for taper near the meniscus and better Adapting to the shrinkage of the billet shell in the longitudinal direction of the mold, the thickness of the air gap in the longitudinal direction of the mold is further reduced, effectively eliminating the adverse effects of the air gap, and enhancing the heat transfer effect of the entire mold, but the disadvantages of this scheme are: It only solves the air gap problem caused by the shrinkage of the slab from the shape of the inner cavity, but cannot solve the problem of uneven cooling along the circumference of the section during the solidification process of the slab.

Similarly, the invention patent "a cast iron horizontal continuous casting double-jacket mold" (201410571277.X) includes a steel sleeve and a high-purity graphite sleeve embedded in the steel sleeve. The steel sleeve includes an inner sleeve and an outer sleeve, and the inner sleeve There is a trapezoidal cross-section spiral water channel on the top, and the water channel is provided with a partition that divides the water channel into two parts, the water channel I and the water channel II. The water channel I and the water channel II are respectively provided with water inlet and outlet pipes. This invention fully utilizes the horizontal connection controlled by the double water jacket. Advantages of the casting process, avoiding steel breakout, can increase the drawing speed, but the disadvantage is that although the spiral water tank used in this scheme can increase the heat exchange efficiency, it still cannot solve the problem of the casting billet along the circumferential direction of the section during the solidification process. Uneven cooling problem

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