A crystallizer, a copper melting furnace and a copper-coated steel production line with the same

Abstract

The present application relates to the technical field of copper clad steel production by horizontal continuous casting process, and particularly relates to a crystallizer, a copper melting furnace and a copper clad steel production line with the same. The crystallizer comprises a fixing sleeve provided with a first through hole; a cooling pipe, a first end of the cooling pipe being arranged in the first through hole, the cooling pipe being provided with a passage allowing a steel wire to pass through; and a pouring mold, a part of the pouring mold being arranged in the first through hole and being in butt joint with the first end of the cooling pipe, the pouring mold being provided with a second through hole allowing the steel wire to pass through, a gap being reserved between the steel wire and an inner wall of the second through hole, the pouring mold being provided with at least one pouring hole on a side wall exposed outside the first through hole, the pouring hole allowing copper liquid to flow in, the pouring hole being in communication with the second through hole and being perpendicular to the second through hole in an axis direction, so that the copper liquid flowing in through the pouring hole covers the surface of the steel wire in the cooling pipe and the pouring mold. The present application solves the problem that the crystallizer affects the complete contact between the copper liquid and the steel wire due to the temperature difference between the crystallizer and the copper liquid, and the thickness of the copper layer on the steel wire is not uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper clad steel production by horizontal continuous casting process, in particular to a crystallizer, a copper melting furnace and a copper clad steel production line with the same. BACKGROUND

[0002] Copper clad steel bimetallic composite material, also known as copper clad steel (or copper clad steel), is a composite conductor processed by special process of copper and steel. The composite conductor has high strength, excellent elasticity, large thermal resistance and high permeability of steel, and good electrical conductivity and excellent corrosion resistance of copper, and is widely used in electrical, electronic and many other fields.

[0003] At present, there are mainly three methods (electroplating method, cladding method and horizontal continuous casting cladding method) for copper cladding on the surface of steel wire in China. Among them, the horizontal continuous casting cladding method solves the problems of thin copper layer by electroplating and poor combination by cladding method, and is a commonly used production method for domestic manufacturers. The production process of horizontal continuous casting cladding method includes steel wire pretreatment process, copper melting process, crystallization process and post-treatment process. The crystallization process is the core process of horizontal continuous casting cladding method, and is directly related to the thickness of the copper layer cladded on the surface of the steel wire. Although the steel wire will be preheated before entering the copper liquid, the melting point temperature of copper is 1083.4℃, combined with the fact that cooling water will be introduced into the crystallizer, and the temperature of the steel wire in the crystallizer is lower than that of the copper liquid, which is easy to cause temperature difference between the crystallizer and the copper liquid, resulting in copper liquid solidification phenomenon at the connection between the copper liquid and the crystallizer, affecting the complete contact of the copper liquid with the steel wire, and easily causing the problems of uneven thickness of the copper layer cladded on the steel wire, poor combination and poor cladding quality. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects of uneven thickness of the copper layer cladded on the steel wire, poor combination and poor cladding quality caused by the temperature difference between the crystallizer and the copper liquid in the prior art, which affects the complete contact of the copper liquid with the steel wire, so as to provide a crystallizer, a copper melting furnace and a copper clad steel production line with the same.

[0005] In order to solve the above problems, the present application provides a crystallizer, comprising:

[0006] A fixing sleeve is provided with a first through hole;

[0007] A cooling pipe is provided with a passage allowing the steel wire to pass through;

[0008] The pouring mold is partially arranged in the first through hole and is arranged in butt joint with the first end of the cooling pipe, the pouring mold is provided with a second through hole allowing the steel wire to pass through, a gap is reserved between the steel wire and the inner wall of the second through hole, the pouring mold has at least one pouring hole allowing the copper liquid to flow in on the side wall exposed outside the first through hole, the pouring hole is arranged in communication with the second through hole and the axes thereof are perpendicular to each other, so that the copper liquid entering through the pouring hole covers the surface of the steel wire in the pouring mold and the cooling pipe.

[0009] Optionally, the pouring hole is a plurality of equidistantly and uniformly distributed holes arranged on the circumferential side wall of the pouring mold, and the pouring mold is made of graphite.

[0010] Optionally, the cooling pipe comprises a water inlet and a water outlet, and a cooling water channel for connecting the water inlet and the water outlet, the water inlet and the water outlet are arranged at the second end of the cooling pipe, so that the cooling water channel forms a "C" type structure, and the first end of the cooling pipe is the inlet end of the steel wire.

[0011] Optionally, a joint is arranged on the second end of the cooling pipe, the joint is matched with the cooling pipe, and the joint is provided with an inlet and an outlet at positions corresponding to the water inlet and the water outlet.

[0012] Optionally, the inner diameter of the cooling pipe is arranged in equal diameter.

[0013] Optionally, a core setting mold is further arranged in the second through hole, the core setting mold has a core setting hole, the core setting hole is matched with the steel wire passing through the core setting hole in a gap mode, and the inner diameter of the core setting mold is the same as the inner diameter of the cooling pipe.

[0014] A copper melting furnace is further provided, and the crystallizer is arranged at the outlet of the copper melting furnace.

[0015] Optionally, a pair of fixing blocks are further arranged in a relative spacing mode, each of the fixing blocks has a mounting hole, and the fixing sleeves of the pair of crystallizers are arranged in the mounting holes, respectively.

[0016] Optionally, the two fixing sleeves are arranged in a coaxial mode, and the inner diameter of the cooling pipe of the crystallizer arranged at the inlet of the copper melting furnace gradually increases from the first end to the second end.

[0017] A copper clad steel production line is further provided, and the copper melting furnace is arranged in the copper clad steel production line.

[0018] The technical scheme has the following advantages:

[0019] 1. The crystallizer provided by the present application comprises: a fixed sleeve, the fixed sleeve being provided with a first through hole; a cooling pipe, a first end of the cooling pipe being arranged in the first through hole, the cooling pipe being provided with a channel allowing a steel wire to pass through; and a pouring mold, the pouring mold being partially arranged in the first through hole and being arranged in butt joint with the first end of the cooling pipe, the pouring mold being provided with a second through hole allowing the steel wire to pass through, a gap being reserved between the steel wire and an inner wall of the second through hole, the pouring mold being provided with at least one pouring hole on a side wall exposed outside the first through hole, the pouring hole being arranged in communication with the second through hole, so that the copper liquid entering through the pouring hole covers the surface of the steel wire in the pouring mold and the cooling pipe. The fixed sleeve is provided with the first through hole, the cooling pipe and the pouring mold are arranged in the first through hole and are arranged in butt joint, so that the steel wire passing through the second through hole of the pouring mold can smoothly enter the channel of the cooling pipe. In the process of copper coating steel, the pouring mold extending out of the fixed sleeve is in contact with the molten copper liquid, the pouring hole is arranged on the side wall of the pouring mold exposed outside the first through hole and is arranged in communication with the second through hole, the copper liquid enters the pouring mold and the cooling pipe arranged in butt joint with the pouring mold through the pouring hole arranged on the pouring mold, so that the copper liquid and the steel wire are in complete contact in the pouring mold and the cooling pipe, so as to coat the surface of the steel wire with the copper liquid. In the process of the pouring mold contacting the copper liquid, the area of the pouring hole is always in contact with the copper liquid, so that there is no temperature difference between the two, the copper solution can smoothly flow onto the surface of the steel wire, the phenomenon that the copper liquid solidifies at the connection between the crystallizer and the copper liquid due to the temperature difference between the two is avoided, complete contact between the copper liquid and the steel wire is realized, the uniformity of the thickness of the copper layer is ensured, and the coating of the copper liquid on the steel wire is realized to improve the coating quality. Moreover, the axes of the pouring hole and the second through hole are perpendicular to each other, so that the copper liquid flows to the surface of the steel wire at the fastest speed, and the solidification of the copper liquid is further avoided.

[0020] 2. The crystallizer provided by the present application, the pouring holes are uniformly distributed at equal intervals on the circumferential side wall of the pouring mold, the multiple pouring holes can make the copper liquid flow onto the surface of the steel wire from different directions, and the copper liquid is more uniformly coated on the surface of the steel wire. The pouring mold is made of graphite, graphite has good thermal conductivity, is resistant to chemical corrosion, and does not react with the copper solution, the strength of graphite at high temperature increases with the increase of temperature, and the pouring mold can be made into a mold with complex shape and high precision.

[0021] 3. The crystallizer provided by the present application, the cooling pipe comprises an inlet and an outlet, and a cooling water channel for connecting the inlet and the outlet, the inlet and the outlet are arranged at the second end of the cooling pipe, so that the cooling water channel forms a "C" shape structure, and the first end of the cooling pipe is the inlet end of the steel wire. The "C" shape structure design makes the cold water entering from the inlet fully exchange heat with the copper layer in the cooling pipe through the cooling water channel, and then flows to the outlet, which prolongs the contact time of the cold water in the cooling water channel with the copper layer in the cooling pipe, and realizes the best effect of cooling the copper layer in the cooling pipe. After the copper liquid enters from the pouring hole, it exchanges heat with the cooling liquid in the cooling pipe, and the temperature difference between the copper liquid and the cooling liquid is small during the flow process, so as to prevent the copper liquid at the pouring hole from being frozen due to the too low temperature of the water and blocking the pouring hole, and further ensure the uniformity of the copper coating.

[0022] 4. The crystallizer provided by the present application, the second end of the cooling pipe is provided with a connector, the connector is matched with the cooling pipe, and the inlet and the outlet are respectively arranged at positions corresponding to the inlet and the outlet of the cooling pipe, so that the connector is convenient to connect with the water pipe.

[0023] 5. The crystallizer provided by the present application, the inner diameter of the cooling pipe is of equal diameter, and the equal diameter of the cooling pipe can effectively reduce the manufacturing cost and smoothly extract the steel wire coated with copper.

[0024] 6. The crystallizer provided by the present application further comprises a core setting mold arranged in the second through hole, the core setting mold has a core setting hole, the core setting hole is in gap cooperation with the steel wire passing through the core setting hole, and the inner diameter of the core setting mold is the same as the inner diameter of the cooling pipe. The gap cooperation realizes the relative movement between the steel wire and the core setting hole. At the same time, the inner diameter of the core setting mold is the same as the inner diameter of the cooling pipe, so that the thickness of the copper layer on the steel wire passing through the core setting mold is always uniform.

[0025] 7. The copper melting furnace provided by the present application further comprises a pair of fixed blocks arranged in opposite positions, each fixed block has a mounting hole, a fixed sleeve of a pair of crystallizers is arranged in the mounting hole, and the two fixed sleeves are coaxially arranged. The core setting mold is arranged in the fixed sleeve, and the core setting molds of the coaxially arranged fixed sleeves are also coaxially arranged, so as to ensure the coaxiality of the steel wire passing through the pair of core setting molds arranged in opposite positions, so that the copper liquid can be uniformly coated on the steel wire, and a copper coated steel product with uniform thickness is obtained. The inner diameter of the cooling pipe of the crystallizer located at the inlet of the copper melting furnace gradually increases from the first end to the second end, so as to empty the air in the cooling pipe. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 A structure schematic diagram of the pull-out end crystallizer provided in the embodiments of the present application is shown in the figure.

[0028] Figure 2 A water flow direction schematic diagram of the cooling pipe provided in the embodiments of the present application is shown in the figure.

[0029] Figure 3 A semi-sectional view of the pull-in end crystallizer provided in the embodiments of the present application is shown in the figure.

[0030] Figure 4 A top structure schematic diagram of the copper melting furnace provided in the embodiments of the present application is shown in the figure.

[0031] Explanation of the reference signs: 1, water inlet; 2, water outlet; 3, cooling pipe; 4, fixing sleeve; 5, pouring mold; 6, pouring hole; 7, core mold; 8, joint; 9, connecting port; 10, fixing block; 11, steel wire; 12, high-temperature-resistant brick; 13, asbestos; 14, to-be-melted copper material. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] like Figure 1 - Figure 4 A specific embodiment of the copper melting furnace shown includes: asbestos 13, a first layer of high-temperature resistant bricks 12, copper material to be melted 14, and a second layer of high-temperature resistant bricks 12 arranged sequentially from the outside to the inside of the outer wall. The second layer of high-temperature resistant bricks 12 has a pair of fixing blocks 10 spaced apart from each other. Each fixing block 10 has a mounting hole. Fixing sleeves 4 for the crystallizer at the inlet and outlet of the copper melting furnace are respectively located within the mounting holes. A steel wire 11 to be coated with copper is placed between the pair of fixing sleeves 4. To ensure the uniformity of the copper liquid thickness coated on the steel wire 11, the two fixing sleeves 4 are coaxially arranged. A copper melting box is also provided inside the copper melting furnace, and the copper rod to be melted is placed in the copper melting box.

[0037] like Figure 1 As shown, the crystallizer includes: a fixed sleeve 4, a cooling pipe 3 and a casting mold 5, which are connected to each other in the first through hole of the fixed sleeve 4. The cooling pipe 3 has a channel that allows a steel wire 11 to pass through, with one end located in the first through hole and a connector 8 sleeved at the second end. Specifically, the cooling pipe 3 is made of copper.

[0038] like Figure 1 As shown, part of the casting mold 5 is located inside the first through hole of the fixing sleeve 4, and the other part extends to the outside of the first through hole. The casting mold 5 has a second through hole that allows the steel wire 11 to pass through, and a gap is reserved between the steel wire 11 and the inner wall of the second through hole. In order to allow the molten copper in the copper melting furnace to cover the steel wire 11 in the cooling pipe 3, four casting holes 6 are evenly spaced along the circumferential direction on the exposed side wall of the casting mold 5, and the casting holes 6 are connected to the second through hole. To be suitable for the high-temperature environment in the copper melting furnace, the casting mold 5 is made of graphite.

[0039] like Figure 1As shown, the fixed sleeve 4 is provided with a second through hole, and a fixed core mold 7 is arranged in the second through hole of the fixed sleeve 4, the fixed core mold 7 has a fixed core hole, the fixed core mold 7 is in clearance fit with the steel wire 11 passing through the fixed core mold 7, and the inner diameter of the fixed core mold 7 is the same as the inner diameter of the cooling pipe 3. In order to resist high temperature and ensure that the inner diameter is unchanged, the fixed core mold 7 is made of boron nitride ceramic material, the fixed core mold 7 made of boron nitride ceramic has very high precision, so as to ensure the coaxiality of the steel wire 11 entering the furnace, and make the thickness of the copper layer covering the steel wire 11 more uniform.

[0040] As shown in the figure, Figure 2 The cooling pipe 3 includes a water inlet 1 and a water outlet 2, and a cooling water channel for connecting the water inlet 1 and the water outlet 2, the water inlet 1 and the water outlet 2 are arranged at the second end of the cooling pipe 3, and the cooling water entering from the water inlet 1 flows to the water outlet 2 in the cooling water channel through the "C" type flow channel. Compared with the outlet pipe, the inlet pipe is closer to the steel wire, so that the cooling water can better cool the copper layer in the cooling pipe. In order to facilitate the connection of the cooling water, the second end of the cooling pipe 3 is further sleeved with a matched connector 8, and the inlet and outlet corresponding to the positions of the water inlet 1 and the water outlet 2 are respectively arranged on the connector 8. In order to realize the connection of the cooling pipe 3 with other devices, the side wall of the second end of the cooling pipe 3 is further provided with a connecting port 9.

[0041] As shown in the figure, Figure 3 The crystallizer at the inlet of the copper melting furnace is different in structure from the crystallizer at the outlet of the copper melting furnace. The first end of the cooling pipe 3 is fixedly connected with a fixed sleeve, and the second end is sleeved with the connector 8. In order to avoid the interference of oxygen and other gases in the air on the crystallization process, the side wall of the second end of the cooling pipe 3 is further provided with a nitrogen gas interface.

[0042] The inner diameter of the cooling pipe 3 of the crystallizer at the inlet of the copper melting furnace is also conical, that is, the inner diameter gradually increases from the first end to the second end. In the process of copper-coated steel, the nitrogen gas filled in the nitrogen gas interface of the second end will fill the space between the steel wire and the cooling pipe 3 as the inner diameter decreases. At the same time, the pressure in the furnace is higher than the pressure in the crystallizer, that is, the nitrogen gas in the furnace will be discharged to the space between the cooling pipe 3 and the steel wire when the steel wire is inserted, thereby evacuating the air in the cooling pipe, preventing the steel wire from carrying air when moving from the second end to the first end. In addition, the design that the inner diameter of the first end is smaller than the inner diameter of the second end can also make the steel wire smoothly enter the crystallizer, reducing the time of the steel wire entering the crystallizer.

[0043] In the implementation process, charcoal is added into the hearth to consume oxygen in the copper melting furnace, and the copper melting furnace is powered to dissolve the copper rod to be melted. Under the action of electromagnetic induction, the copper rod to be melted slowly melts into copper liquid, and as time goes on, the liquid level slowly reaches the height of the steel wire 11. Before entering the copper melting furnace, the copper wire will be preheated, and at the same time, the steel wire 11 adopts a step-by-step moving mode, that is, the steel wire 11 moves a distance after a period of time to ensure sufficient contact between the copper liquid and the steel wire 11. After entering the inside of the crystallizer at the outlet of the copper melting furnace, the copper liquid enters the gap between the cooling pipe 3 and the steel wire 11 through the pouring hole 6, and the cold water flows into the cold water channel flow channel through the inlet of the joint 8 and then flows out. The copper liquid slowly cools down in contact with the steel wire 11 to form a layer of copper on the surface of the copper wire, which is soft in texture and uniform in thickness. Then the steel wire in the crystallizer is pulled out by the traction mechanism arranged outside the outlet of the copper melting furnace to enter the cooling mechanism for cooling. It should be noted that the operator continuously adds copper rods, charcoal and other required raw materials into the copper melting furnace to ensure that the copper liquid and gas content in the furnace always meet the production standards.

[0044] The crystallizer provided by the application has high precision and high coaxiality, facilitates continuous production of enterprises, and thus a copper-clad steel product with uniform thickness is obtained.

[0045] The application further provides a copper-clad steel production line comprising the copper melting furnace.

[0046] As an alternative embodiment, the number of pouring holes 6 can also be one, two, three or even more.

[0047] As an alternative embodiment, the inner diameter of the cooling pipe 3 of the crystallizer at the inlet of the copper melting furnace can also be set as equal diameter.

[0048] Obviously, the above embodiments are only examples for clear illustration, and are not a limitation on the embodiments. Based on the above description, other different forms of changes or variations can also be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the application.

Claims

1. A crystallizer characterized by, The application relates to a horizontal continuous casting device, which comprises a fixed sleeve (4) provided with a first through hole; a cooling pipe (3) provided with a first end in the first through hole, a passage allowing a steel wire (11) to pass through, an inlet (1) and an outlet (2) and a cooling water passage connecting the inlet (1) and the outlet (2), wherein the inlet (1) and the outlet (2) are arranged at a second end of the cooling pipe (3) to form a "C" type structure, and the first end of the cooling pipe (3) is an inlet end of the steel wire (11); and a pouring mold (5) partially arranged in the first through hole and abutting against the first end of the cooling pipe (3), and extending to the outside of the first through hole, wherein the pouring mold (5) is provided with a second through hole allowing the steel wire (11) to pass through, a gap is reserved between the steel wire (11) and the inner wall of the second through hole, the pouring mold (5) is provided with at least one pouring hole (6) allowing copper liquid to flow in on the side wall outside the first through hole, the pouring holes (6) are uniformly distributed on the circumferential side wall of the pouring mold (5), the pouring holes (6) are arranged in communication with the second through hole, and the axes are perpendicular to each other, so that the copper liquid entering through the pouring holes (6) covers the surface of the steel wire (11) in the pouring mold (5) and the cooling pipe (3).

2. The crystallizer of claim 1, wherein The pouring mold (5) is made of graphite.

3. The crystallizer of claim 1, wherein A joint (8) is arranged on the second end of the cooling pipe (3), the joint (8) is matched with the cooling pipe (3), and an inlet and an outlet are arranged at positions corresponding to the inlet (1) and the outlet (2) respectively.

4. The crystallizer of claim 1, wherein The inner diameter of the cooling pipe (3) is of equal diameter.

5. The crystallizer according to any one of claims 1 to 4, characterized in that A core mold (7) is arranged in the second through hole, the core mold (7) is provided with a core hole, the core hole is matched with the steel wire (11) passing through the core hole in a gap mode, and the inner diameter of the core mold (7) is the same as the inner diameter of the cooling pipe (3).

6. A copper smelting furnace, characterized in that The application further relates to a crystallizer according to any one of claims 1-3, which is arranged at the outlet of a copper melting furnace.

7. The copper melting furnace according to claim 6, characterized in that A pair of fixed blocks (10) are arranged in a spaced mode, each of the fixed blocks (10) is provided with a mounting hole, and the fixed sleeves (4) of a pair of crystallizers are arranged in the mounting holes respectively.

8. The copper melting furnace according to claim 7, characterized in that The two fixed sleeves (4) are coaxially arranged, and the inner diameter of the cooling pipe (3) of the crystallizer at the inlet of the copper melting furnace gradually increases from the first end to the second end.

9. A copper over steel production line characterized in that, The application further relates to a copper melting furnace according to any one of claims 6-8.

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