A cooling pipe for a continuous casting billet crystallizer

Abstract

This utility model relates to a cooling pipe for a continuous casting billet crystallizer, belonging to the technical field of continuous casting crystallizers. It includes a copper pipe and a water jacket, both being square in shape. The copper pipe is placed inside the water jacket, forming a water gap between them. Multiple axially extending intermediate water grooves are provided on the four outer surfaces of the copper pipe. The depth of these intermediate water grooves on each outer surface of the copper pipe is such that the groove at the center of the plane is deeper, while the grooves on the two sides are shallower. The top surfaces of the intermediate water grooves on each outer surface of the copper pipe are flush, and the depth gradually decreases from the center of the plane to the two sides. This reduces excessive cooling at the corners of the copper pipe, avoids the "sharp corner effect," achieves uniform cooling of the copper pipe, and reduces the risk of corner cracks in the cast billet. It effectively controls the pulsation of the cooling water, reduces the occurrence of "hot spots," improves the cooling effect, and extends the service life of the crystallizer copper pipe.

Description

Technical Field

[0001] This utility model relates to the field of crystallizer technology. Background Technology

[0002] The simple square billet crystallizer copper tube has a water gap of a few millimeters between it and the water jacket. When water passes through this gap, the pulsating instability of the cooling water causes uneven cooling on the surface of the copper tube, creating "hot spots." These hot spots affect the lifespan of the copper tube and the quality of the cast billet. When producing larger cross-section continuously cast billets, the thickness of the crystallizer copper tube increases to withstand the pressure of the molten steel. However, increased thickness also increases thermal resistance, reducing the cooling conduction efficiency of the copper tube and affecting the cooling effect. This leads to a slower casting speed, which cannot meet production requirements. Summary of the Invention

[0003] The present invention aims to solve the problems of uneven cooling and poor cooling effect in existing crystallizer casting processes.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: a cooling pipe for a continuous casting billet crystallizer, comprising a copper pipe and a water jacket, wherein the copper pipe and the water jacket are square, the copper pipe is placed inside the water jacket, and a water gap is formed between the two, characterized in that: multiple axially extending intermediate water grooves are provided on the four outer surfaces of the copper pipe, and the depth of the intermediate water grooves on each outer surface of the copper pipe satisfies that the intermediate water groove at the center of the plane is deep and the intermediate water grooves on both sides are shallow.

[0005] Preferably, the top surfaces of the intermediate water tanks on the outer surfaces of the copper tubes are flush, and the depth gradually decreases from the center of the plane to the two sides, thereby forming intermediate water tanks with different depths in a stepped manner.

[0006] Preferably, the width of the water gap is 0.2mm, that is, the gap between the top surface of the intermediate water tank and the inner wall of the water jacket is 0.2mm.

[0007] Preferably, a set screw is installed by drilling and tapping a hole in the water jacket, and the set screw abuts against the copper tube to fix the copper tube.

[0008] Compared with existing technologies, the advantages of this invention are as follows: A central water tank is designed and manufactured on the surface of the copper tube in the crystallizer. The depth of the central water tank varies, with a deeper central tank at the center of the outer plane of the copper tube and a shallower central tank at the corners. This reduces excessive cooling at the corners of the cast billet, helps to achieve uniform cooling intensity, and reduces the risk of corner cracks in the cast billet. The designed and manufactured water tank increases the cooling water flow rate, accelerates the formation of forced turbulence, reduces the generation of hot spots, improves the cooling effect of the cast billet, and enhances the quality of the cast billet. The stepped water tanks of different depths reduce thermal resistance, ensure the rigidity of the copper tube, and meet the requirements of high-speed continuous casting production. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of the steel water jacket 1 and the copper pipe 2 in an embodiment of this utility model;

[0010] Figure 2 This is a longitudinal cross-sectional view of the steel water jacket 1 and the copper pipe 2 in this embodiment of the present invention;

[0011] In the diagram, 1 is the water jacket, 2 is the copper pipe, and 3 is the set screw. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings. The embodiments described are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0013] The cooling water pipe for the continuous casting billet crystallizer consists of a copper pipe (2) and a steel water jacket (1). Both the copper pipe and the water jacket are square-shaped, with the copper pipe located inside the water jacket, forming a water gap between them. Different depths of central water grooves are machined on the outer surface of the copper pipe (2) using a milling machine. The depth of the central water grooves is deeper at the center of the copper pipe and shallower at the corners. The copper pipe (2) with the central water grooves on its outer surface is installed inside the steel water jacket (1). The installation dimension of the outer cavity of the copper pipe (2) is slightly smaller than the installation dimension of the steel water jacket (0.2 mm). In this way, the cooling water mainly flows through the central water grooves, resulting in a small pipe diameter and high flow velocity, creating forced turbulence and reducing hot spots. Figure 1 As shown, milling intermediate water channels of different depths can meet the rigidity requirements of copper tubes, reduce thermal resistance, and improve heat transfer. The depth of the intermediate water channel at the corner of the copper tube is shallower than that at the center of the copper tube plane, which reduces excessive cooling at the corner of the billet, helps to achieve uniform cooling intensity, and reduces the risk of corner cracking of the billet.

[0014] like Figure 2 As shown, the gap between the steel water jacket 1 and the outer wall of the copper pipe 2, which was normally 5-7 mm, is changed to 0.2 mm. Set screws 3 are installed by drilling and tapping threads on the steel water jacket 1. Two rows of set screws 3 are installed on the steel water jacket 1 to fix the copper pipe 2.

[0015] The crystallizer cooling tube with the above structure has the following technical advantages:

[0016] 1) It reduces excessive cooling at the corners of the copper tubes, avoids the "sharp corner effect", achieves uniform cooling of the copper tubes, and reduces the risk of corner cracks in the cast billet.

[0017] 2) Effectively control the pulsation of cooling water, reduce the occurrence of "hot spots", improve the cooling effect and extend the service life of the crystallizer copper tubes.

[0018] 3) Ensure that the copper tube wall is below the recrystallization temperature to prevent grain coarsening and copper tube rigidity, thereby improving the quality of the cast billet and the service life of the copper tube, and meeting the requirements of high-speed and modern production of large-section cast billets.

[0019] The above description is merely an illustration of some principles of this utility model. This specification is not intended to limit this utility model to the specific structure and applicable scope shown. Therefore, all possible modifications and equivalents that may be used fall within the scope of the patent application of this utility model.

Claims

1. A cooling pipe for a continuous casting square billet mold, comprising a copper pipe and a water jacket, said copper pipe and water jacket being square, the copper pipe being disposed inside the water jacket, a water gap being formed between the copper pipe and the water jacket, characterized in that: The copper tube has multiple axially extending intermediate water grooves on its four outer surfaces. The depth of the intermediate water grooves on each outer surface of the copper tube satisfies the condition that the intermediate water groove at the center of the plane is deep and the intermediate water grooves on both sides are shallow.

2. The cooling tube for a continuous casting billet mold according to claim 1, characterized by: The top surfaces of the intermediate water tanks on the outer surfaces of the copper pipes are flush with each other, and the depth gradually decreases from the center of the plane to the two sides.

3. The cooling tube for a continuous casting billet mold according to claim 1, characterized by: The width of the water gap is 0.2mm, which means that the gap between the top surface of the intermediate water tank and the inner wall of the water jacket is 0.2mm.

4. The cooling pipe for a continuous casting billet crystallizer according to claim 1, characterized in that: The water jacket is drilled and threaded to install set screws, which abut against the copper tube to fix the copper tube.

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