Crystallizer copper pipe die capable of adjusting taper of inner cavity on line

Abstract

The invention provides a crystallizer copper pipe die capable of adjusting the taper of an inner cavity on line, and relates to the technical field of crystallizers, the crystallizer copper pipe die comprises a tubular main body, at least one wall of the tubular main body is provided with a longitudinal groove, and the opening direction of the longitudinal groove is the outer surface of the tubular main body; the longitudinal groove is the same as the casting channel of the tubular main body in direction and is formed in the feeding end; the expansion pipe is arranged in the longitudinal groove, at least one end of the expansion pipe is provided with a combination connector, and the combination connector is detachably connected with a pressurizing pipeline. And variable field working conditions cannot be adapted. The technical problems of poor attachment degree of a casting blank and the inner wall of a crystallizer copper pipe mold, poor outward heat transfer of the casting blank, deterioration of the quality of a casting product, even cracking of the casting blank and leakage of a casting medium in the prior art are solved.

Description

Technical Field

[0001] The invention mainly relates to the technical field of crystallizers, and in particular to a crystallizer copper tube mold capable of adjusting the inner cavity taper online. Background Art

[0002] As the core component of continuous casting or semi-continuous casting, different types of crystallizer copper molds are well known. Its main body is a tubular structure. The inner cavity of the tubular structure is a channel for casting, which can promote the liquid metal to form a casting billet and can adapt to different shape requirements, such as round, square, rectangular and polygonal. The outer surface of the tubular structure usually forms one or more channels in the longitudinal direction. These channels are part of a closed cooling cycle, and the cooling medium is water.

[0003] Patent 200480010049.X describes a structural form of a crystallizer for continuous casting, including a copper tube forming a mold cavity and a device for cooling the copper tube by water circulation cooling, characterized in that the copper tube is provided with a support shell over the entire circumference and substantially over the entire length, which supports the copper tube on the supporting surface at the outer side, and cooling liquid channels for guiding cooling water are distributed over the entire circumference in the copper tube or in the support shell and are substantially arranged over the entire length of the ingot mold.

[0004] An ingot mold for continuous casting of steel in the form of polygonal, preferably rectangular, cross-sectioned blanks and slabs, comprising a copper tube forming a mold cavity and a device for cooling the copper tube by water circulation cooling, characterized in that the copper tube is provided with a support plate connected to the copper tube and supporting the copper tube wall at the support surface on the outer side of the tube substantially over the entire circumference and substantially over the entire length, and cooling liquid channels for guiding cooling water are distributed in the copper tube or in the support plate over the entire circumference and are arranged substantially over the entire length of the ingot mold.

[0005] The function of the support plate is to maintain the distance between the cooling device and the copper tube, while the connection plate is inserted into an attachment base made on the cooling device, defining a fixed joint-type mechanical connection, allowing the copper tube to be removed from the external cooling device.

[0006] Patent CN 105473253 A describes another form of a crystallizer copper tube mold for continuous casting, which includes a tubular body having at least one wall, the at least one wall defining a longitudinal casting cavity and a plurality of longitudinal grooves, the plurality of longitudinal grooves being formed on at least a portion of the at least one wall and leading to the outside of the at least one wall, characterized in that a covering adhesive comprising one or more layers of fiber material is irremovably wrapped around the outer surface of the at least one wall.

[0007] The longitudinal groove is closed by a metal layer, which is made by electrolytic deposition technology. The metal layer defines a plurality of corresponding cooling liquid channels, which are configured to allow cooling fluid to flow therein, characterized in that the covering adhesive wraps around the metal layer and is in direct contact with the metal layer to make the whole composed of the at least one wall and the metal layer stronger.

[0008] Although the support plate of patent 200480010049.X mechanically connects the copper tube and the external cooling device, the connection is not tight and is affected by the manufacturing tolerances of the copper tube and the external cooling device. Therefore, the overall rigidity is poor, the copper tube is prone to deformation, and the deformation direction is uncontrolled.

[0009] Although patent CN 105473253A allows the inner and outer tubular bodies to be connected by high-strength electroplating, thereby improving the overall strength and allowing them to be non-deformed or slightly deformed during use, the taper of the inner tubular body cannot be changed after the processing and manufacturing is completed.

[0010] The known traditional crystallizer copper tube mold, whose taper does not match the site, will cause a series of casting defects. One situation is that the strength of the crystallizer is not high, and the thermal stress caused by the contact temperature between the liquid steel and the inner wall of the crystallizer copper tube mold mainly bulges inward in the meniscus area, which will cause the taper between the meniscus area and the upper entrance to decrease, and make the lower section of the crystallizer copper tube mold always have a taper larger than the standard taper relative to the meniscus area, which is the passive deformation of the crystallizer copper tube. In another case, the strength of the crystallizer copper tube mold is enhanced by an external cooling device to prevent the copper tube from deforming. In the above two cases, the taper of the inner cavity of the crystallizer copper tube mold cannot be actively changed. When the on-site process conditions such as the carbon content of the production steel or the pulling speed change, the taper of the already made crystallizer copper tube mold cannot be adjusted and cannot adapt to the changing on-site working conditions. This will cause the degree of fit between the ingot and the inner wall of the crystallizer copper tube mold to deteriorate, the heat transfer of the ingot to the outside to deteriorate, the quality of the casting product to deteriorate, and even the ingot to rupture, resulting in leakage of the casting medium.

[0011] It should be noted that the above contents belong to the technical cognition scope of the inventor. Since the technical contents in this field are vast and too complicated, the above contents of this application do not necessarily constitute prior art. Summary of the invention

[0012] 1. Technical problems to be solved by the invention: The present invention provides a crystallizer copper tube mold capable of adjusting the inner cavity taper online, so as to solve the technical problems existing in the above-mentioned background technology.

[0013] 2. Technical solution: To achieve the above object, the present invention provides a technical solution: a crystallizer copper tube mold capable of adjusting the inner cavity taper online, comprising: A tubular body, wherein at least one wall of the tubular body is provided with a longitudinal groove, the opening direction of the longitudinal groove is the outer surface of the tubular body, the longitudinal groove is in the same direction as the casting channel of the tubular body and is provided at the feeding end; An expansion tube is arranged inside the longitudinal groove, and at least one end of the expansion tube is provided with a connecting joint, and the connecting joint can be detachably connected to the pressurized pipeline.

[0014] When the device is used, liquid metal will enter from the top of the tubular body and flow out from the bottom. The heat of the liquid metal will be quickly conducted out by the tubular body. When the liquid metal changes to solid metal, its temperature will decrease and it will shrink. Moreover, the pulling speed is different. The metal shrinkage rate adapted to the conventional crystallizer is within a certain range. If it exceeds the metal shrinkage rate range adapted to it, the quality of the discharged steel will decrease. Therefore, the conventional operation method requires the replacement of the corresponding crystallizer. This method is easy to delay the manufacturing period and has a high manufacturing cost. When the device is used to crystallize materials with a smaller shrinkage rate, the crystallization operation can be carried out normally. When the shrinkage rate is large, the product quality will be affected due to the large shrinkage of the liquid metal when it changes to solid metal. Therefore, the material is transported inside the expansion tube through the pressurized pipeline, so that the expansion tube expands in the longitudinal groove, thereby ensuring that the longitudinal groove of the tubular body becomes wider, thereby increasing the opening size of the feeding end of the tubular body, while the size of the discharging end of the tubular body remains unchanged, thereby increasing the taper of the casting channel, and making the taper of the inner cavity of the tubular body fit closely with the casting metal with a high shrinkage rate, so as to achieve the purpose of good cooling.

[0015] Furthermore, the tubular body is made of high thermal conductivity material, including but not limited to one or more of TP2, Tag0.1P, CuZrCr or CuNiBe.

[0016] Furthermore, cooling liquid channels are opened on four sides of the tubular body, and a cooling liquid inlet and a cooling liquid outlet are respectively provided at two ends of the cooling liquid channel.

[0017] Furthermore, the outer wall of the tubular body is directly connected to the cooling liquid channel.

[0018] Furthermore, the longitudinal grooves are arranged in a ring shape on the four side walls of the tubular body, and two longitudinal grooves are symmetrically arranged on each side wall.

[0019] Furthermore, the shape of the longitudinal groove is circular, square, triangular or polygonal.

[0020] Furthermore, the length of the longitudinal groove is smaller than the length of the tubular body.

[0021] Furthermore, a plurality of expansion tubes are provided in the longitudinal groove, and the plurality of expansion tubes are detachably connected to the pressurized pipeline via joints.

[0022] Furthermore, the expansion tube is made of a high temperature resistant rubber tube with good ductility.

[0023] Furthermore, the distance between the bottom of the longitudinal groove and the inner wall of the casting channel is 3-15 mm, and the width of the longitudinal groove is 3-40 mm.

[0024] 3. Beneficial effects: Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The invention has a reasonable design. By arranging a longitudinal groove on the outer wall of the tubular body to cooperate with the expansion tube, the taper of the inlet end of the tubular body can be adjusted online for carbon steel with different shrinkage rates, thereby improving the adaptability of the tubular body and improving the fit between the inner wall of the copper tube mold of the crystallizer and the ingot, so as to ensure the quality of the ingot after leaving the copper tube mold of the crystallizer. In addition, the device has a simple structure and has no taboos during installation. It will not affect the use of electromagnetic stirring and liquid level detection. It has high adaptability and can save a lot of molding costs. Since there is no need to frequently replace crystallizers of different specifications, the crystallization efficiency can be improved.

[0025] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented by using the prior art, and are not described in detail here because they do not involve the design points and improvement directions of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a side structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the top cross-sectional structure of the present invention; Figure 4 It is a side cross-sectional schematic diagram of the present invention; Figure 5 It is a side cross-sectional schematic diagram of another depth of the present invention.

[0027] Reference numerals: 1. Tubular body; 2. Casting channel; 3. Outer surface of copper mold wall; 4. Cooling liquid channel; 5. Longitudinal groove; 6. Expansion tube; 7. Joint; 8. Cooling liquid inlet; 9. Cooling liquid outlet; 10. Sealing screw plug. DETAILED DESCRIPTION

[0028] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] It should be noted that the structures not introduced in the present invention do not involve the design points and improvement directions of the present invention, and can adopt the existing technologies known to those skilled in the art.

[0033] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0034] See attached Figure 1-4 , a crystallizer copper tube mold capable of adjusting the inner cavity taper online, comprising A tubular body 1, wherein at least one wall of the tubular body 1 is provided with a longitudinal groove 5, the opening direction of the longitudinal groove 5 is the outer surface of the tubular body 1, the longitudinal groove 5 is in the same direction as the casting channel 2 of the tubular body 1 and is arranged at the feeding end; An expansion tube 6 is arranged inside the longitudinal groove 5. At least one end of the expansion tube 6 is provided with a coupling joint 7. The coupling joint 7 can be detachably connected to a pressurized pipeline.

[0035] When the device is used, liquid metal will enter from the top of the tubular body 1 and flow out from the bottom. The heat of the liquid metal will be quickly conducted out by the tubular body 1. When the liquid metal turns into solid metal, its temperature will decrease and it will shrink. Moreover, the pulling speed is different. The metal shrinkage rate adapted by the conventional crystallizer is within a certain range. If it exceeds the metal shrinkage rate range, the quality of the discharged steel will decrease. Therefore, the conventional operation method requires the replacement of the corresponding crystallizer, which is easy to delay the manufacturing period and has a high manufacturing cost. The device is suitable for materials with a smaller shrinkage rate. When the material is crystallized, the crystallization operation can be carried out normally. When the shrinkage rate is large, the metal shrinkage when the liquid metal turns into a solid state will affect the product quality. Therefore, the material is transported to the inside of the expansion tube 6 through the pressurized pipeline to make the expansion tube 6 expand in the longitudinal groove 5, thereby ensuring that the longitudinal groove 5 of the tubular body 1 becomes wider, thereby making the opening size of the inlet end of the tubular body 1 larger, while the size of the outlet end of the tubular body 1 remains unchanged, thereby making the taper of the casting channel 2 larger, so that the taper of the inner cavity of the tubular body 1 is closely fitted with the casting metal with a high shrinkage rate, so as to achieve the purpose of good cooling.

[0036] The tubular body 1 is made of high thermal conductivity materials, including but not limited to one or more of TP2, Tag0.1P, CuZrCr or CuNiBe. It should be noted that the material of the tubular body 1 can also be other conventional materials that can be used by people in this field, and no examples are given here.

[0037] The tubular body 1 is provided with cooling liquid channels 4 on four sides, and cooling liquid inlet 8 and cooling liquid outlet 9 are respectively provided at both ends of the cooling liquid channel 4. In order to improve the crystallization efficiency of the tubular body 1, a cooling liquid channel 4 is arranged in the side wall of the tubular body 1. The cooling liquid channel 4 continuously circulates the cooling medium through the cooling liquid inlet 8 and the cooling liquid outlet 9, thereby quickly cooling and crusting the liquid metal inside. It should be noted that if the cooling liquid channel 4 is large, the cooling medium inside it will exert a certain pressure on the tubular body 1, thereby causing the tubular body 1 to become smaller. At this time, a pressurized pipeline is required to transport material to the inside of the expansion tube 6, so that the expansion tube 6 expands slightly in the longitudinal groove 5 to offset the deformation caused by the pressure exerted by the cooling medium on the tubular body 1. The end of the cooling liquid channel 4 can be sealed by a sealing screw plug 10.

[0038] The outer wall of the tubular body 1 is directly connected to the cooling liquid channel 4. In this embodiment, the cooling liquid channel 4 is arranged on the outer surface 3 of the copper mold wall of the tubular body 1, which can reduce the deformation caused by excessive pressure in the cooling liquid channel 4. The tubular outer wall is directly connected to the cooling liquid channel 4 is an existing technology and will not be elaborated here.

[0039] The longitudinal grooves 5 are arranged in an annular manner on the four side walls of the tubular body 1, and two longitudinal grooves 5 are symmetrically arranged on each side wall. In this embodiment, expansion tubes 6 are placed in the eight annularly arranged longitudinal grooves 5. One or more expansion tubes 6 can be placed, and the expansion tubes 6 can apply different pressures according to the metal shrinkage rate, thereby completing the adjustment of the taper of the tubular body 1.

[0040] The shape of the longitudinal groove 5 is circular, square, triangular or polygonal. It should be noted that the specific shape of the longitudinal groove 5 is not actually limited. When the expansion tube 6 is expanded, pressure can be applied to both sides to complete the taper adjustment.

[0041] The length of the longitudinal groove 5 is smaller than the length of the tubular body 1 , so as to facilitate adjustment of the taper of the tubular body 1 .

[0042] A plurality of expansion tubes 6 are provided in the longitudinal groove 5, and the plurality of expansion tubes 6 are detachably connected to the pressurized pipeline through the joint 7. The plurality of expansion tubes 6 are continuously arranged in the longitudinal groove 5, so that the pressure of each section of the expansion tube 6 can be controlled separately to control the change of the taper, thereby more accurately controlling the taper of the tubular body 1.

[0043] The expansion tube 6 is made of a high temperature resistant rubber tube with good ductility, and can evenly apply pressure to the side wall of the longitudinal groove 5. The conveying material of the expansion tube 6 can be hydraulic oil or cooling water.

[0044] The distance between the bottom of the longitudinal groove 5 and the inner wall of the casting channel 2 is 3-15 mm, and the width of the longitudinal groove 5 is 3-40 mm.

[0045] In another embodiment of the present application, the casting channel 2 inside the tubular body 1 is used for cooling the solidified shell of the high-temperature liquid metal, the longitudinal groove 5 is arranged on the outer surface of the four walls of the tubular body 1, the opening direction is on the outer surface of the tubular body 1, the distance between the longitudinal groove 5 and the longitudinal internal casting channel 2 is 5mm, the longitudinal groove 5 is manufactured by processing, the width of the longitudinal groove 5 is 20mm, the length direction of the longitudinal groove 5 is consistent with the casting channel 2 of the tubular body 1, the length of the longitudinal groove 5 is about half of the length of the tubular body 1, and one or more high-temperature resistant rubber tubes are placed in each longitudinal groove 5, the high-temperature resistant rubber tube is in contact with the longitudinal groove 5 of the copper mold, and the diameter of the high-temperature resistant rubber tube can expand under the pressure of the high-pressure fluid, and the pressure is transmitted to the longitudinal groove 5 of the tubular body 1. When the tubular body 1 is subjected to the pressure from the high-temperature resistant rubber tube, the longitudinal groove 5 on the tubular body 1 will be deformed, and the width of the longitudinal groove 5 will increase. The deformation rule is as follows: the width of the longitudinal groove 5 near the casting channel 2 of the tubular body 1 changes little, and the width of the longitudinal groove 5 far away from the casting channel 2 of the tubular body 1 changes greatly. The two ends of the high temperature resistant rubber tube are connected with metal joints, and the metal joints are used for high pressure fluid sealing pipeline connection.

[0046] When the liquid metal enters from the upper end of the casting channel 2 of the tubular body 1, the heat of the high-temperature liquid metal is transferred to the external cooling liquid channel 4 of the tubular body 1 through the wall of the tubular body 1, and the cooling medium, such as water, oil, etc., takes away the heat through the external cooling liquid channel 4 of the tubular body 1. While the heat of the liquid metal in the casting channel 2 of the tubular body 1 is taken away, the temperature of the part in contact with the wall of the tubular body 1 gradually decreases, and the liquid state becomes solid. The liquid metal in the casting channel 2 of the tubular body 1 becomes solid metal, and shrinks as its temperature decreases. Moreover, the shrinkage rules of different pulling speeds and different liquid metal components are inconsistent. Taking steel as an example, low-carbon steel has a large shrinkage rate, such as Q195 or 08Al, whose linear expansion coefficient is about 130.96×10-6 / ℃ at 1300℃, and high-carbon steel has a small shrinkage rate, such as Gr15 or 83B, whose linear expansion coefficient is about 71.81×10-6 / ℃ at 1300℃.

[0047] In this embodiment, when manufacturing the tubular body 1, the minimum shrinkage rate is selected to design the inner cavity of the copper mold casting channel 2. When the shrinkage rate of the metal component of the casting channel 2 of the tubular body 1 is the smallest, since the cooling medium in the cooling liquid channel 4 outside the tubular body 1 will exert a certain pressure on the tubular body 1, at this time, a liquid with a lower pressure is injected into the high temperature resistant rubber tube to resist the compression deformation of the cooling liquid channel 4 on the tubular body 1, to ensure that the width of the longitudinal groove 5 on the tubular body 1 does not change, so that the taper of the inner cavity of the casting channel 2 of the tubular body 1 and the casting metal are closely fitted. When the shrinkage rate of the metal component in the casting channel 2 of the tubular body 1 is relatively large, the cooling medium in the external cooling liquid channel 4 of the tubular body 1 will exert a certain pressure on the tubular body 1. At this time, a liquid with a relatively large pressure is injected into the hydraulic expansion hose to ensure that the longitudinal groove 5 on the tubular body 1 becomes wider, the wall of the tubular body 1 is deformed, and it bulges from the casting channel 2 to the cooling liquid channel 4, and the size of the casting channel 2 of the tubular body 1 becomes larger. Since the longitudinal groove 5 on the outside of the tubular body 1 is arranged close to the entrance of the casting channel 2, the size of the casting channel 2 at the entrance position becomes larger, the size of the lower mouth of the casting channel 2 remains unchanged, and the taper of the casting channel 2 becomes larger, so that the taper of the inner cavity of the tubular body 1 is closely fitted with the cast metal with a high shrinkage rate, so as to achieve the purpose of good cooling.

[0048] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A crystallizer copper tube mold capable of adjusting the inner cavity taper online, characterized in that: include A tubular body (1), wherein at least one wall of the tubular body (1) is provided with a longitudinal groove (5), the opening direction of the longitudinal groove (5) is the outer surface of the tubular body (1), the longitudinal groove (5) is in the same direction as the casting channel (2) of the tubular body (1) and is arranged at the feeding end; An expansion pipe (6), the expansion pipe (6) being arranged inside the longitudinal groove (5), and at least one end of the expansion pipe (6) being provided with a connecting joint (7), the connecting joint (7) being detachably connected to a pressurized pipeline.

2. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The tubular body (1) is made of high thermal conductivity material, including but not limited to one or more of TP2, Tag0.1P, CuZrCr or CuNiBe.

3. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The tubular body (1) has cooling liquid channels (4) on four sides thereof, and the cooling liquid channels (4) have cooling liquid inlets (8) and cooling liquid outlets (9) at two ends thereof.

4. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The outer wall of the tubular body (1) is directly connected to the cooling liquid channel (4).

5. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The longitudinal grooves (5) are arranged in an annular manner on the four side walls of the tubular body (1), and two longitudinal grooves (5) are symmetrically arranged on each side wall.

6. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The shape of the longitudinal groove (5) is circular, square, triangular or polygonal.

7. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The length of the longitudinal groove (5) is smaller than the length of the tubular body (1).

8. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: A plurality of expansion tubes (6) are arranged in the longitudinal groove (5), and the plurality of expansion tubes (6) are detachably connected to the pressurized pipeline via respective joints (7).

9. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The expansion tube (6) is made of a high temperature resistant rubber tube and has good ductility.

10. The crystallizer copper tube mold capable of adjusting the inner cavity taper online according to claim 1, characterized in that: The distance between the bottom of the longitudinal groove (5) and the inner wall of the casting channel (2) is 3 to 15 mm, and the width of the longitudinal groove (5) is 3 to 40 mm.

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