A continuous casting machine crystallizer and continuous casting machine

Abstract

The application provides a continuous casting machine crystallizer and a continuous casting machine. The continuous casting machine crystallizer comprises a copper pipe and a water jacket, the water jacket is sleeved on the periphery of the copper pipe, the outer wall of the copper pipe is provided with a plurality of grooves extending along the longitudinal direction of the copper pipe, the water jacket is composed of a base layer and a soft layer, the soft layer is tightly connected to the inner wall of the base layer, the material of the soft layer has flexibility, and the hardness of the material of the soft layer is less than the hardness of the material of the copper pipe, so that the problem of damaging the copper pipe and other components during assembly can be avoided, preferably, there is no gap between the inner wall of the soft layer and the outer wall of the copper pipe, the cooling efficiency and the cooling uniformity can be improved, and the assembly difficulty and the assembly cost are reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of mechanical technology and steel metallurgy technology, and particularly relates to a continuous casting machine crystallizer and a continuous casting machine. BACKGROUND

[0002] In the production of metal solidification of round, square and rectangular cross-section billets, liquid metal is poured into the crystallizer and cooled once in the crystallizer, or cooled once and then cooled twice after leaving the crystallizer to form a metal billet. The tubular crystallizer is usually composed of a tubular body, a water jacket and a cylinder. The material of the tubular body is usually copper or copper alloy, commonly known as "copper pipe". The metal melt is poured into the copper pipe of the crystallizer, and the outside of the copper pipe of the crystallizer is cooled by using a cooling medium (such as water), so that the metal melt in the inner cavity of the copper pipe crystallizes and solidifies along the inner wall of the copper pipe to form a rapid cooling layer, and then a primary shell with a certain safety thickness is formed before the metal billet with a liquid core leaves the copper pipe of the crystallizer.

[0003] The high-efficiency continuous casting process requires uniform and efficient cooling of the crystallizer and uniform growth of the primary shell. At present, the more common cooling method is to process multiple longitudinal grooves on the outer wall of the copper pipe, and to provide a water jacket outside the copper pipe. The water jacket and the grooves form a certain width of channel which can be used for the cooling medium to pass through. To obtain a uniform primary shell, the first task is to ensure that the cooling medium passes through these channels, so the smaller the gap between the inner wall of the water jacket and the outer wall of the copper pipe, the better, and the ideal state is to be close together. If the gap is too large, the cooling water will flow through the gap, which will inevitably affect the amount of cooling water flowing through the channel, thereby reducing the cooling efficiency; and if the gap is too large, it is difficult to ensure uniformity of the gap around the crystallizer during assembly, which may cause the gap to shift to one side, resulting in the situation that one side is close together and the other side has double the gap, so that the amount of cooling water around the outer wall of the copper pipe is quite different, leading to uneven cooling and affecting the uniformity of the shell solidification, and ultimately leading to quality accidents. Especially when the flow and pressure of the cooling medium of the high-efficiency continuous casting crystallizer are high, for example, the high-efficiency continuous casting of 165mm x 165mm square billets requires a crystallizer cooling water supply pressure of 1.0MPa-1.2MPa and a water quantity of 180m 3 -200m 3 (50% more than conventional continuous casting), under such conditions, a too large or uneven gap between the outer wall of the copper pipe and the inner wall of the water jacket is more likely to cause uneven cooling and heat transfer around the copper pipe, thereby seriously affecting the stability of continuous casting production.

[0004] However, on the other hand, in order to facilitate assembly, a certain gap needs to exist between the outer diameter of the copper pipe and the inner diameter of the water jacket, because in actual production, the outer diameter of the copper pipe and the inner diameter of the water jacket often have design tolerances, for example, in the traditional water jacket crystallizer, the design tolerance requirement of the outer wall of the copper pipe and the inner wall of the water jacket is ±0.2mm, and due to production process reasons, this tolerance requirement is often difficult to achieve, so in order to avoid the copper pipe from not being able to be assembled into the water jacket, the gap between the outer diameter of the copper pipe and the inner diameter of the water jacket is at least 0.5mm, so it is difficult to achieve the ideal state of the inner wall of the water jacket and the outer wall of the copper pipe being tightly together, thereby when the copper pipe, the water jacket and other components are replaced (among them, the copper pipe is a consumable part in the continuous casting crystallizer, which needs to be frequently disassembled and replaced), the gap often needs to be adjusted to be evenly distributed around, which inevitably needs to disassemble other components in the crystallizer for gap adjustment work, and in severe cases, even needs to disassemble the water jacket and the copper pipe for pre-assembly, resulting in difficult assembly and heavy workload. In addition, the copper pipe is easy to collide with the water jacket during assembly, and if the water jacket is made of hard material, there is a risk of steel pipe wear. SUMMARY

[0005] In view of the above technical status, the present application provides a continuous casting machine crystallizer, wherein the copper pipe is easy to assemble and can reduce damage to the copper pipe during assembly.

[0006] The technical scheme of the present application is: a continuous casting machine crystallizer, comprising a copper pipe and a water jacket, the water jacket is sleeved around the copper pipe, and the outer wall of the copper pipe is provided with a plurality of grooves extending along the longitudinal direction of the copper pipe; the water jacket is composed of a base layer and a soft layer, and the soft layer is tightly connected to the inner wall of the base layer; the material of the soft layer has flexibility, and the hardness of the material of the soft layer is less than the hardness of the material of the copper pipe.

[0007] In the present application, the copper pipe has a tubular structure with open ends, in the tubular structure, the extension direction of the hollow cavity axis is the longitudinal direction of the copper pipe, and the cross section perpendicular to the hollow cavity axis is the cross section.

[0008] The material of the soft layer is not limited and includes glass fiber, plastic, rubber and their composite materials, etc. The soft layer contacts the copper pipe, and heat is conducted to the soft layer during heat exchange. Preferably, the material of the soft layer has high temperature resistance, and the heat resistance temperature is greater than or equal to 200℃. Preferably, the material of the soft layer is high temperature resistant glass fiber, plastic, rubber and their composite materials, etc.

[0009] In order to make the water jacket have enough rigidity to withstand the pressure difference of the cooling medium and the pressure conducted by the deformation of the copper pipe under the static pressure of the molten steel, preferably, the material of the base layer is a rigid material, and the hardness of the material is greater than the hardness of the material of the soft layer. The material of the base layer includes but is not limited to rigid metal materials, such as stainless steel, carbon steel, copper and other metals.

[0010] The soft layer is on the periphery of the copper pipe, in order to reduce the gap between the inner wall of the soft layer and the outer wall of the copper pipe as much as possible, thereby improving the cooling efficiency and cooling uniformity, as preferred, in each cross section of the copper pipe and the water jacket, the gap between the inner diameter of the soft layer and the outer diameter of the copper pipe is not more than 0.5mm, further preferably not more than 0.2mm, as more preferred, there is no gap between the inner diameter of the soft layer and the outer diameter of the copper pipe, at this time, when the copper pipe is sleeved in the water jacket, due to the flexibility of the soft layer, it can guide the copper pipe, and the inner wall of the soft layer and the groove of the outer wall of the copper pipe are closed to form a cooling channel along the longitudinal direction of the copper pipe.

[0011] The connection mode of the soft layer and the inner wall of the base layer is not limited, which can be tightly connected with the base layer by bonding, or the soft layer can be formed on the inner wall of the base layer by high-temperature die casting forming process, for example, by high-temperature one or more times die casting precision forming, or after rough casting forming, the precise inner cavity size can be obtained by machining. In order to enhance the bonding force between the base layer and the soft layer, a plurality of base layer pits and / or base layer protrusions can be arranged on the inner wall of the base layer, and a plurality of soft layer protrusions matched with the base layer pits and / or a plurality of soft layer pits matched with the base layer protrusions are arranged on the outer wall of the soft layer, that is, the base layer pits and the soft layer protrusions are tightly combined, and the base layer protrusions and the soft layer pits are tightly combined. As preferred, the height of the base layer protrusion is not more than 2 / 3 of the thickness of the soft layer, and further preferably not more than 1 / 3 of the thickness of the soft layer.

[0012] The thickness of the base layer is not limited and can be adjusted according to actual needs, as preferred, the thickness of the base layer is 10mm-20mm.

[0013] The thickness of the soft layer is not limited and can be adjusted according to actual needs, as preferred, the thickness of the soft layer is 3mm-6mm.

[0014] The depth, width, spacing or number of the grooves are not limited and can be designed according to actual heat transfer needs, as preferred, one or more of the depth, width, spacing and number of the grooves are designed to form uniform cooling effect on the outer wall of the copper pipe.

[0015] The structure of the water jacket is not limited and can be a whole structure or a split structure, for example, a split structure composed of two parts split along the longitudinal direction, and the two parts of the water jacket are connected on the outer wall of the base, for example, connected by a connecting plate.

[0016] The cross-sectional shape of the copper pipe is not limited and can be rectangular, circular or other shapes.

[0017] Compared with the prior art, the water jacket is designed as a two-layer structure composed of a base layer and a soft layer, the soft layer is tightly connected to the inner wall of the base layer, which has the following beneficial effects:

[0018] (1) due to the setting of the soft layer, the problem of damage and wear of the copper pipe and other components caused by collision and friction during assembly is avoided, when the inner diameter of the soft layer is equal to the outer diameter of the copper pipe, the copper pipe can be guided without scratching the copper pipe, especially when the copper pipe manufacturing tolerance and other reasons cause the inner diameter of the soft layer to be equal to or slightly smaller than the outer diameter of the copper pipe, so that the copper pipe is not easy to assemble, and due to the flexibility of the soft layer, auxiliary assembly such as extrusion and knocking can be used without damaging the copper pipe;

[0019] (2) the preferred soft layer of the present application has no gap between the inner wall of the soft layer and the outer wall of the copper pipe, on the one hand, the recesses of the inner wall of the soft layer and the outer wall of the copper pipe are closed to form cooling channels along the longitudinal direction of the copper pipe, during the cooling process, the cooling medium can basically completely pass through these cooling channels, avoiding the cooling medium flowing through the gap between the inner wall of the water jacket and the outer wall of the copper pipe to reduce the cooling water flow through the channel, thereby improving the cooling efficiency and realizing efficient cooling, and providing protection for the uniform cooling of the outer wall of the copper pipe, when the recesses of the outer wall of the copper pipe and the inner wall of the soft layer form a channel that can provide uniform cooling effect, the cooling effect of each channel is ensured to be consistent due to the absence of gap between the inner wall of the soft layer and the outer wall of the copper pipe; on the other hand, when there is a gap between the inner wall of the water jacket and the outer wall of the copper pipe, the installation needs to be aligned in position and other steps, which reduces the assembly difficulty and cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the crystallizer structure in Example 1.

[0021] Figure 2 is Figure 1 A-A cross-sectional view of the water jacket and the copper pipe in Example 1.

[0022] Figure 3 is Figure 1 a longitudinal sectional view of the water jacket in Example 1.

[0023] Figure 4 is Figure 3 B-B cross-sectional view of Example 1.

[0024] Figures 1-4 the reference signs in Example 1 are:

[0025] 1- water jacket, 2- copper pipe, 3- cylinder, 11- flange, 12- base layer, 13- soft layer, 21- cooling channel, 22- gap between the inner wall of the soft layer and the outer wall of the copper pipe, 31- lower water cavity, 32- upper water cavity. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in conjunction with the examples.

[0027] As Figure 1As shown, the crystallizer comprises a copper tube 2, a water jacket 1 and a cylinder body 3, the copper tube 2 and the water jacket 1 are arranged in the cylinder body 3 Figure 1 In the figure, only the position relationship between the cylinder body 3 and the copper tube 2, the water jacket 1 in the cross section is shown, and the longitudinal direction of the cylinder body is not shown in order to clearly show the copper tube and the water jacket.

[0028] The water jacket 1 is sleeved on the periphery of the copper tube 2. As shown, in this embodiment, the cross section of the copper tube is rectangular with a circular arc chamfer, and the outer wall of the copper tube is provided with a plurality of grooves with a certain interval between each groove. Figure 2 As shown, in this embodiment, the water jacket 1 is composed of a flange 11, a base layer 12 and a soft layer 13, the soft layer 13 is tightly connected to the inner wall of the base layer 12, the soft layer is on the periphery of the copper tube, and the flange 11 is located on the periphery of the base layer and is connected to the base layer by welding, and the water cavity of the crystallizer is divided into an upper water cavity 32 and a lower water cavity 31.

[0029] Figure 1 As shown, in this embodiment, the material of the soft layer 13 is high-temperature-resistant rubber, and the materials of the base layer 12 and the flange 11 are stainless steel with rigidity and high hardness. 3 In this embodiment, the thickness of the base layer is 10-20 mm, and the thickness of the soft layer is about 3-6 mm.

[0030] In this embodiment, the soft layer 13 is formed on the inner wall of the base layer 12 by high-temperature one-time or multi-time precision die casting forming process. In some embodiments, the soft layer can also be obtained by machining after high-temperature rough casting forming to obtain the precise size of the inner cavity of the soft layer. In some embodiments, a plurality of base layer pits and / or base layer protrusions can also be arranged on the inner wall of the base layer, and a plurality of soft layer protrusions matched with the base layer pits are arranged on the outer wall of the soft layer, which form a tight combination, and a plurality of soft layer pits matched with the base layer protrusions also form a tight combination, and the height of the base layer protrusion does not exceed 2 / 3 of the thickness of the soft layer.

[0031] In this embodiment, in the continuous casting process, the liquid metal is poured into the copper tube 2 of the crystallizer, and the solidification heat exchange in the copper tube 2 is realized by cooling the outer wall of the copper tube by cooling water. As shown, after the cooling water enters the lower water cavity 31 of the crystallizer, it enters the cooling channel 21 from the lower end of the copper tube, and cools the outer wall of the copper tube during the flow from bottom to top. After the temperature of the cooling water rises, it returns to the upper water cavity 32 of the crystallizer from the upper end of the copper tube and returns to the cooling water system.

[0032] As shown, in this embodiment, the material of the soft layer 13 is high-temperature-resistant rubber, and the materials of the base layer 12 and the flange 11 are stainless steel with rigidity and high hardness.

[0033] Figure 1 In this embodiment, the thickness of the base layer is 10-20 mm, and the thickness of the soft layer is about 3-6 mm.

[0034] ​​In the embodiment, the gap 22 between the inner wall of the soft layer and the outer wall of the copper pipe is substantially zero, i.e. there is substantially no gap between the inner wall of the soft layer and the outer wall of the copper pipe, forming a close fit, and the inner wall of the soft layer and the groove of the outer wall of the copper pipe are closed to form cooling channels 21 along the longitudinal direction of the copper pipe. The upper and lower ends of the cooling channels 21 are open and communicate with the upper and lower water chambers of the crystallizer, and the cooling water can be completely transmitted through the cooling channels to achieve high-efficiency cooling. In the embodiment, the depth, width, spacing and number of the grooves of the outer wall of the copper pipe 2 are designed according to the heat transfer calculation results, and the cooling channels 21 along the longitudinal direction of the copper pipe are closed with the inner wall of the soft layer, which forms a uniform cooling effect on the liquid metal in the copper pipe in the continuous casting process. In some embodiments, the gap between the inner diameter of the soft layer and the outer diameter of the copper pipe in each cross section of the copper pipe and the water jacket is 0.2mm-0.5mm.

[0035] In the embodiment, when the crystallizer copper pipe 2 is replaced, only the upper flange cover of the crystallizer cylinder 3 needs to be removed, the old copper pipe is removed, the new copper pipe is replaced, and the upper flange cover is assembled. Since the inner diameter of the soft layer 13 of the water jacket 1 and the outer diameter of the copper pipe 2 are substantially the same, when the copper pipe 2 is installed, the soft layer 13 guides the copper pipe 2 and does not scratch the copper pipe, and the gap between the two is very small, which does not cause uneven gaps between the two. At the same time, due to the use of soft contact structure, when the copper pipe is not easy to install due to manufacturing tolerance, a soft hammer can be used for auxiliary assembly, and the copper pipe will not be damaged.

[0036] Finally, it should be noted that the specific embodiments described herein are merely illustrative of the spirit of the present application and are not limiting of the embodiments of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, and it is not necessary or possible to fully describe all embodiments. Any obvious changes or variations derived from the spirit of the present application still fall within the scope of the present application, and any additional limitations are contrary to the spirit of the present application.

Claims

1. A continuous casting machine crystallizer comprising a copper tube and a water jacket, the water jacket being sleeved on the periphery of the copper tube, and a plurality of grooves being formed on the outer wall of the copper tube and extending along the longitudinal direction of the copper tube; characterized in that: The water jacket is composed of a base layer and a soft layer, the soft layer is tightly connected to the inner wall of the base layer; the material of the soft layer is flexible and has a hardness less than that of the copper pipe; A plurality of base layer concaves and / or base layer protrusions are arranged on the inner wall of the base layer, a plurality of soft layer protrusions matching the base layer concaves and a plurality of soft layer concaves matching the base layer protrusions are arranged on the outer wall of the soft layer, the base layer concaves and the soft layer protrusions are tightly combined, and the base layer protrusions and the soft layer concaves are tightly combined.

2. A continuous caster crystalliser as claimed in claim 1, characterised in that: The material of the soft layer comprises one or more of glass fiber, plastic, rubber and their composite materials.

3. A continuous caster crystallizer as claimed in claim 1, characterized in that: The material of the soft layer has high temperature resistance.

4. A continuous caster crystalliser as claimed in claim 3, characterised in that: The heat resistance temperature of the material of the soft layer is greater than or equal to 200℃.

5. A continuous caster crystalliser as claimed in claim 3, characterised in that: The material of the soft layer is one or more of high temperature resistant glass fiber, plastic, rubber and their composite materials.

6. The continuous caster crystallizer of claim 1, wherein: The material of the base layer is rigid material.

7. A continuous caster crystallizer as claimed in claim 1, characterized in that: The hardness of the material of the base layer is greater than that of the material of the soft layer.

8. A continuous caster crystallizer as claimed in claim 1, characterized in that: The material of the base layer is metal material.

9. A continuous caster crystallizer as claimed in claim 1, characterized in that: The material of the base layer is stainless steel, carbon steel or copper.

10. A continuous caster crystallizer as claimed in claim 1, characterized in that: In each cross section of the copper pipe and the water jacket, the gap between the inner diameter of the soft layer and the outer diameter of the copper pipe is not greater than 0.5mm.

11. A continuous caster crystalliser as claimed in claim 10, characterised in that: The gap between the inner diameter of the soft layer and the outer diameter of the copper pipe is not greater than 0.2mm.

12. A continuous caster crystalliser as claimed in claim 11 characterised in that: There is no gap between the inner diameter of the soft layer and the outer diameter of the copper pipe.

13. A continuous caster crystallizer as claimed in claim 1, characterized in that: The soft layer is tightly connected to the base layer by bonding or is formed on the inner wall of the base layer by high temperature pressure casting forming process.

14. A continuous caster crystallizer as claimed in claim 1, characterized by: The height of the base layer protrusion is not more than 2 / 3 of the thickness of the soft layer.

15. A continuous caster crystalliser as claimed in claim 14, characterised in that: The height of the base layer protrusion is not more than 1 / 3 of the thickness of the soft layer.

16. A continuous caster crystallizer as claimed in claim 1, characterized by: The depth, width, spacing and number of the grooves are designed according to actual heat transfer requirements to achieve uniform cooling.

17. A continuous caster crystallizer as claimed in claim 1, characterized by: The thickness of the base layer is 10-20mm.

18. A continuous caster crystallizer as claimed in claim 1, characterized by: The thickness of the soft layer is 3-6mm.

19. A continuous caster crystallizer as claimed in claim 1, characterized by: The water jacket has a whole structure or a split structure.

20. A continuous caster crystallizer as claimed in claim 1, characterized by: The water jacket has a split structure composed of two parts split along the longitudinal direction, and the two parts of the water jacket are connected at the outer wall of the base.

21. A continuous caster characterized by: The crystallizer comprises any one of claims 1-20.

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