Gas protection device for copper alloy up-drawing continuous casting crystallizer

Abstract

The utility model provides a gas protection device for a copper alloy up-drawing continuous casting crystallizer, which comprises an up-drawing channel port, a gas cavity, a gas inlet and a gas outlet and is mounted at the upper end of a water-cooling copper sleeve of the crystallizer. The outer diameter of the upward guiding channel opening is the same as that of the crystallizer, the inner diameter of the upward guiding channel opening is larger than that of the crystallizer, the inner wall of the gas cavity is inclined, the cross section of the gas cavity is in an inverted right trapezoid shape, the gas inlet is formed in the top face of the upward guiding channel opening, and the gas outlet hole is formed in the inclined inner wall of the gas cavity. The gas hood has the advantages that positive pressure is formed in the gas hood cavity, so that oxidizing gas in the external environment is prevented from entering the graphite mold at the bottom to react with a copper up-drawing casting rod blank and the graphite mold at high temperature, and the risks of pulling stop and breaking caused by viscosity increase due to oxidation are avoided; the surface quality of the rod blank is improved, the service life of the graphite crystallizer mold is prolonged, production efficiency is improved, and production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of copper alloy casting, in particular to a gas protection device for a copper alloy upward continuous casting crystallizer. Background Art

[0002] The non-vacuum melting of high-copper alloys is currently a major difficulty, especially for alloying elements such as chromium, zirconium, magnesium, silver, tin, and rare earth elements. It is very difficult to control the composition and surface quality. For example, when producing such copper alloys through the upward continuous casting method, the surface of the cast rod billet often becomes black, cracks are severe, and the surface is rough. These defects are mainly related to high-temperature oxidation. In the production process of copper alloy upward continuous casting rod billets, the melt is easily oxidized when entering the crystallizer and solidifying, resulting in increased viscosity and the risk of pulling out or breaking. In addition, graphite molds are also easily oxidized at high temperatures, which shortens the life of the graphite mold and increases production costs.

[0003] Currently, the upward continuous casting process for copper alloys is still immature, with most research focusing on composition control methods. Relatively little research has been conducted on controlling oxidation in upward continuous casting rod blanks. However, patent CN106735003B reports a device for slotting copper alloy molds in non-vacuum horizontal continuous casting to fill with protective gas, improving the surface quality of the rods. Slotting graphite molds can address oxidation issues, but it also affects mold life and increases the degree of workability. Unlike horizontal continuous casting, upward continuous casting is assembled from top to bottom. If the density of the protective gas is greater than that of air, the gas will spontaneously diffuse downward. Utility Model Content

[0004] The utility model provides a gas protection device for a copper alloy upward continuous casting crystallizer. By adding protective gas at the top of the upward continuous casting crystallizer, oxygen is effectively isolated, the oxidation problem of the upward continuous casting rod blank can be solved, and the surface quality of the cast rod can be improved.

[0005] In order to solve the above problems, the utility model provides a gas protection device for a copper alloy upward continuous casting crystallizer.

[0006] The utility model provides a gas protection device for a copper alloy upward continuous casting crystallizer, which is characterized in that: the gas protection device for the copper alloy upward continuous casting crystallizer comprises an upward channel opening 1, a gas cavity 2, an air inlet 3 and an air outlet 4, and the gas protection device for the copper alloy upward continuous casting crystallizer is installed at the upper end of a water-cooled copper sleeve 5 of the crystallizer;

[0007] The outer diameter of the upper channel opening 1 is the same as the outer diameter of the crystallizer, and the inner diameter of the upper channel opening is larger than the inner diameter of the crystallizer. The inner wall of the gas chamber 2 is inclined, and the cross section is an inverted right-angled trapezoid. The air inlet 3 is arranged on the top surface of the upper channel opening, and the air outlet 4 is opened on the inclined inner wall of the gas chamber 2.

[0008] The inclination angle of the inner wall of the gas chamber 2 is 30-45 degrees, which can fill the protective gas into the crystallizer.

[0009] The gas inlet 3 can spray the protective gas into the gas cavity 2 so that the gas pressure in the cavity is 1.1-1.5 times the atmospheric pressure.

[0010] The air outlet holes 4 are evenly distributed in the circumferential direction of the inclined inner wall of the gas cavity 2, and the diameter of the air holes is 2-3 mm.

[0011] The protective gas is nitrogen or argon.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] The gas protection device for the copper alloy upper continuous casting crystallizer described in the utility model forms a positive pressure in the gas hood cavity, thereby effectively preventing the oxidizing gas in the external environment from entering the bottom graphite mold and reacting with the copper upper casting rod blank and the graphite mold at high temperature, avoiding the risk of pulling out and breaking caused by increased viscosity due to oxidation, and can improve the surface quality of the rod blank, increase the service life of the graphite crystallizer mold, improve production efficiency and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic structural diagram of a gas protection device for a copper alloy upward continuous casting mold according to an embodiment of the present utility model;

[0016] Figure 2 This is a longitudinal cross-sectional view of the upward continuous casting mold and the gas protection device;

[0017] 1. Upper channel opening; 2. Air cavity; 3. Air inlet; 4. Air outlet; 5. Water-cooled copper sleeve of the crystallizer; 6. Upper continuous casting rod blank. DETAILED DESCRIPTION

[0018] The present invention will be further explained below in conjunction with specific implementation schemes, but it is not intended to limit the present invention. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not intended to limit the limiting conditions for the implementation of the present invention, so they have no technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, terms such as "upper", "lower", "front", "back", and "middle" quoted in this specification are only for the convenience of description and are not intended to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0019] Example 1

[0020] A gas protection device for a copper alloy upward continuous casting crystallizer, characterized in that: the gas protection device for the copper alloy upward continuous casting crystallizer comprises an upward channel opening 1, a gas cavity 2, an air inlet 3 and an air outlet 4, and the gas protection device for the copper alloy upward continuous casting crystallizer is installed at the upper end of a water-cooled copper sleeve 5 of the crystallizer;

[0021] The outer diameter of the upper channel opening 1 is the same as the outer diameter of the crystallizer, and the inner diameter of the upper channel opening is larger than the inner diameter of the crystallizer. The inner wall of the gas chamber 2 is inclined, and the cross section is an inverted right-angled trapezoid. The air inlet 3 is arranged on the top surface of the upper channel opening, and the air outlet 4 is opened on the inclined inner wall of the gas chamber 2.

[0022] The inner wall of the gas chamber 2 has an inclination angle of 30°, which can fill the protective gas into the crystallizer.

[0023] The gas inlet 3 can spray the protective gas into the gas cavity 2 so that the gas pressure in the cavity is 1.1-1.5 times the atmospheric pressure.

[0024] The air outlet holes 4 are evenly distributed in the circumferential direction of the inclined inner wall of the gas cavity 2, and the diameter of the air holes is 2-3 mm.

[0025] The protective gas is nitrogen or argon.

[0026] like Figure 1 and Figure 2A gas protection device for a copper alloy upward continuous casting crystallizer is disclosed. The device is installed at the upper end of a water-cooled copper sleeve of the crystallizer. The outer diameter of the upper channel opening 1 is the same as the outer diameter of the crystallizer, and the inner diameter of the upper channel opening 1 is 0.5 mm larger than the inner diameter of the crystallizer. The cross-section of the gas cavity 2 is an inverted right-angled trapezoid, and the angle between the hypotenuse and the base of the trapezoid is 45°. The air outlet holes 4 are evenly distributed in the circumferential direction of the hypotenuse of the trapezoid, and the air hole diameter is 2 mm.

[0027] When in use, before the copper alloy is drawn up for continuous casting, argon is filled into the gas chamber 2 through the air inlet 3 to form a positive pressure until the upward continuous casting rod billet is completely out of the device, and then the argon filling can be stopped. After 20 minutes, the argon filling is continued, and the process is repeated repeatedly.

[0028] Example 2

[0029] A gas protection device for a copper alloy upward continuous casting crystallizer, characterized in that: the gas protection device for the copper alloy upward continuous casting crystallizer comprises an upward channel opening 1, a gas cavity 2, an air inlet 3 and an air outlet 4, and the gas protection device for the copper alloy upward continuous casting crystallizer is installed at the upper end of a water-cooled copper sleeve 5 of the crystallizer;

[0030] The outer diameter of the upper channel opening 1 is the same as the outer diameter of the crystallizer, and the inner diameter of the upper channel opening is larger than the inner diameter of the crystallizer. The inner wall of the gas chamber 2 is inclined, and the cross section is an inverted right-angled trapezoid. The air inlet 3 is arranged on the top surface of the upper channel opening, and the air outlet 4 is opened on the inclined inner wall of the gas chamber 2.

[0031] The inner wall of the gas chamber 2 has an inclination angle of 45°, which can fill the protective gas into the crystallizer.

[0032] The gas inlet 3 can spray the protective gas into the gas cavity 2 so that the gas pressure in the cavity is 1.1-1.5 times the atmospheric pressure.

[0033] The air outlet holes 4 are evenly distributed in the circumferential direction of the inclined inner wall of the gas cavity 2, and the diameter of the air holes is 2-3 mm.

[0034] The protective gas is nitrogen or argon.

[0035] like Figure 1 and Figure 2 A gas protection device for a copper alloy upward continuous casting crystallizer is disclosed. The device is installed at the upper end of a water-cooled copper sleeve of the crystallizer. The outer diameter of the upper channel opening 1 is the same as the outer diameter of the crystallizer, and the inner diameter of the upper channel opening 1 is 0.5 mm larger than the inner diameter of the crystallizer. The cross-section of the gas cavity 2 is an inverted right-angled trapezoid, and the angle between the hypotenuse and the base of the trapezoid is 45°. The air outlet holes 4 are evenly distributed in the circumferential direction of the hypotenuse of the trapezoid, and the air hole diameter is 2 mm.

[0036] When in use, before the copper alloy is drawn up for continuous casting, argon is filled into the gas chamber 2 through the air inlet 3 to form a positive pressure until the upward continuous casting rod billet is completely out of the device, and then the argon filling can be stopped. After 20 minutes, the argon filling is continued, and the process is repeated repeatedly.

[0037] Matters not covered by this utility model are known in the art. Although the embodiments of the utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A gas protection device for a copper alloy upward continuous casting mold, characterized by: The copper alloy upward continuous casting crystallizer gas protection device comprises an upward channel opening (1), a gas cavity (2), an air inlet (3) and an air outlet (4), and the copper alloy upward continuous casting crystallizer gas protection device is installed on the upper end of the water-cooled copper sleeve (5) of the crystallizer; The outer diameter of the upper channel opening (1) is the same as the outer diameter of the crystallizer, and the inner diameter of the upper channel opening is larger than the inner diameter of the crystallizer. The inner wall of the gas chamber (2) is inclined, and the cross section is an inverted right-angled trapezoid. The air inlet (3) is arranged on the top surface of the upper channel opening, and the air outlet (4) is opened on the inclined inner wall of the gas chamber (2).

2. The gas protection device for a copper alloy upward continuous casting mold according to claim 1, characterized in that: The inclination angle of the inner wall of the gas chamber (2) is 30-45 degrees, which can fill the protective gas into the crystallizer.

3. The gas protection device for a copper alloy upward continuous casting mold according to claim 1, characterized in that: The gas inlet (3) is capable of spraying protective gas into the gas cavity (2) so that the gas pressure in the cavity is 1.1-1.5 times the atmospheric pressure.

4. The gas protection device for a copper alloy upward continuous casting mold according to claim 1, characterized in that: The air outlet holes (4) are evenly distributed in the circumferential direction of the inclined inner wall of the gas cavity (2), and the diameter of the air holes is 2-3 mm.

5. A gas protection device for a copper alloy upward continuous casting mold according to claim 2 or 3, characterized in that: The protective gas is nitrogen or argon.

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