Die casting double-ring argon protection ring mounting structure

Abstract

The utility model discloses a die casting double-ring argon protection ring installation structure which comprises an argon protection ring which is installed at the lower end of a water gap and comprises an inner ring pipe and an outer ring pipe which are concentric and coplanar and a connecting piece for connecting the inner ring pipe and the outer ring pipe. The air inlets of the inner ring pipe and the outer ring pipe are connected with the same air inlet pipe, and a plurality of air outlet through holes are evenly formed in the inner side pipe walls of the inner ring pipe and the outer ring pipe in the circumferential direction. The device is simple in structure, time-saving and labor-saving, can effectively isolate atmosphere to protect molten steel, prevents the molten steel from being polluted, and improves the quality of cast steel ingots.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical component manufacturing in the metallurgical industry, and particularly relates to an installation structure of a double-ring argon protection ring for die casting. Background Art

[0002] Due to the increasing requirements for product flaw detection in the current market, the heavy machinery industry has put forward higher requirements for the quality of die-cast steel ingots. In the casting process of die-cast bottom-pouring steel ingots, the high-temperature molten steel contacts the outside air at the ladle nozzle, which will absorb harmful gas impurities such as oxygen and nitrogen in the air, affecting the internal quality of the steel ingot. Conventional methods cannot effectively avoid the pollution of molten steel.

[0003] CN07372276U discloses an argon protection ring that can improve the quality of steel ingots during die casting in the steelmaking industry. The argon protection ring is made of lightweight aluminosilicate ceramic fiber by one-time die casting. Its structure includes a protection ring body made of aluminosilicate ceramic fiber and two argon input holes. The protection ring body is a hollow cylindrical structure. The protection ring body is installed on the bell mouth. A step is arranged on the inner side of the lower part of the protection ring body. The outer diameter of the step matches the outer diameter of the bell mouth brick, which is convenient for fixing the argon protection ring on the bell mouth. During casting, the tundish nozzle of the ladle is buried in the protection ring body, and argon enters the argon protection ring through the input hole to play a role in isolating the outside air and protecting the casting. The following problems exist in this technical solution: 1) The argon protection ring is arranged on the step. Each time of operation, it is necessary to place the argon protection ring on the step first, and then remove it after the operation is completed, resulting in complex operation, time-consuming and laborious; 2) An opening is provided on the protection ring body, so that after argon enters the argon protection ring through the input hole, it quickly fills the space between the tundish nozzle and the bell mouth to form an argon protection air curtain. The coverage range and effect of this single-layer air curtain are limited, and it is still difficult to completely avoid the possibility of molten steel contacting the air. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a double-ring argon protection ring with simple structure, time-saving and labor-saving, and capable of effectively isolating the atmosphere and protecting the molten steel.

[0005] To achieve the above purpose, the utility model includes an argon protection ring. The argon protection ring is installed at the lower end of the nozzle and includes a concentric and coplanar inner ring pipe and outer ring pipe, and a connecting piece connecting the inner and outer ring pipes; the air inlets of the inner and outer ring pipes are connected to the same air inlet pipe, and a plurality of air outlet through holes are evenly opened on the inner side walls of the inner and outer ring pipes along the circumferential direction.

[0006] Upper and lower rows of air outlet through holes are evenly opened on the inner side walls of the inner and outer ring pipes along the circumferential direction. The openings of the upper row of air outlet through holes are inclined upward, and the openings of the lower row of air outlet through holes are inclined downward.

[0007] The inclination angle α of the upper and lower rows of the air outlet through holes1 = α 2 = 45°.

[0008] The gas outlet through-holes on the inner ring pipe and the gas outlet through-holes on the outer ring pipe are arranged at intervals and crosswise.

[0009] The gas outlet through-holes on the inner ring pipe and the gas outlet through-holes on the outer ring pipe are arranged crosswise at an interval of 15°.

[0010] The diameter of the gas outlet through-hole is φ2 mm.

[0011] The inner and outer ring pipes are connected by four connecting pieces evenly distributed in the circumferential direction.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1) The argon protection ring is fixedly installed (such as welded) at the lower end of the nozzle and has no connection relationship with the bell mouth. Therefore, it is not necessary to reinstall the argon protection ring every time of operation, which saves time and effort.

[0014] 2) An inner ring pipe and an outer ring pipe are provided. By evenly opening a plurality of gas outlet through-holes along the circumferential direction on the inner side walls of the inner and outer ring pipes, when argon gas is ejected, a double-layer three-dimensional annular air curtain with the same center of circle can be formed to cover the molten steel flowing out from the casting nozzle, effectively isolating the outside atmosphere, preventing the molten steel from being polluted, and improving the quality of the cast ingot.

[0015] 3) Both the inner ring pipe and the outer ring pipe are provided with upper and lower rows of gas outlet through-holes. The openings of the upper row of gas outlet through-holes are inclined upward, forming an inclined upward double-layer gas hood to block the contact area between the molten steel and air that may exist between the argon protection ring and the lower end of the nozzle; the openings of the lower row of gas outlet through-holes are inclined downward, forming an inclined downward double-layer gas hood to block the contact area between the molten steel and air that may exist between the argon protection ring and the bell mouth. The coverage range and the effect are greatly increased, effectively avoiding the possibility of contact between the molten steel and air.

[0016] 4) The structure of the present utility model is simple, time-saving and labor-saving, can form a double-layer three-dimensional annular air curtain, effectively isolate the atmosphere and protect the molten steel. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the double-ring argon protection ring of the present utility model;

[0018] Figure 2 is Figure 1 a schematic diagram of the through-hole positions on the pipe walls of the large ring pipe and the small ring pipe in the middle;

[0019] Figure 3 is Figure 1 a schematic diagram of the use state of

[0020] Among them, 1 - inner ring pipe, 2 - outer ring pipe, 3 - intake pipe, 4 - air outlet through hole, 5 - connecting piece, 6 - ladle, 7 - nozzle, 8 - flared mouth, 9 - argon protection ring. Specific embodiments

[0021] The following further elaborates on the present utility model in conjunction with the accompanying drawings and specific embodiments for a clearer understanding of the present utility model, but they do not constitute a limitation to the present utility model.

[0022] As Figure 1 and Figure 3 shown, it includes an argon protection ring 9, and the argon protection ring 9 is installed at the lower end of the nozzle 7.

[0023] The argon protection ring 9 includes a concentric and coplanar inner ring pipe 1 and outer ring pipe 2, and a connecting piece 5 connecting the inner and outer ring pipes 1 and 2. Preferably, in this embodiment, the inner and outer ring pipes 1 and 2 are welded by four connecting pieces 5 evenly distributed in the circumferential direction to ensure uniform force and firm welding.

[0024] The inner and outer ring pipes 1 and 2 can be made of steel pipes with a diameter of φ13mm and a wall thickness of 2mm. As an example, the inner ring pipe 1 can be made in the following way: bend the steel pipe into a ring pipe, seal and weld the starting end of the ring pipe, and bend the end to the outside of the ring to form an intake pipe; make the outer ring pipe 2 with a larger diameter in the same way, and connect the two intake pipes of the inner and outer ring pipes to form the same intake pipe 3.

[0025] The intake ports of the inner and outer ring pipes 1 and 2 are both connected to the same intake pipe 3, and a plurality of air outlet through holes 4 are evenly opened along the circumferential direction on the inner side walls of the inner and outer ring pipes 1 and 2. Preferably, upper and lower rows of air outlet through holes 4 are evenly opened along the circumferential direction on the inner side walls of the inner and outer ring pipes 1 and 2. The openings of the upper row of air outlet through holes 4 are inclined upward, and the openings of the lower row of air outlet through holes 4 are inclined downward. The inclination angles α 1 = α 2 = 45° (see Figure 1 ). The air outlet through holes 4 on the inner ring pipe 1 and the air outlet through holes 4 on the outer ring pipe are arranged at intervals and crosswise (see Figure 2 ), preferably arranged crosswise at intervals of 15°. The diameter of the air outlet through holes is preferably φ2mm.

[0026] In the present utility model, by introducing argon (inert protection gas) with a certain pressure externally, the gas simultaneously enters the inner ring pipe 1 and the outer ring pipe 2 through the intake pipe 3, and then sprays out from a plurality of air outlet through holes 4 simultaneously to form an upward and downward double-layer three-dimensional annular air curtain (see Figure 3), The upward double-layer annular air curtain avoids the possibility of air contacting the molten steel through the welding gap between the argon protection ring 9 and the lower end of the tundish nozzle 7; the downward double-layer annular air curtain can completely cover the molten steel coming out of the lower end of the casting tundish nozzle, effectively isolating the outside atmosphere, preventing the molten steel from being polluted, and improving the quality of the cast ingot.

Claims

1. A mold-cast double-ring argon protection ring installation structure, including an argon protection ring, characterized in that: The argon protection ring is installed at the lower end of the water inlet, and includes an inner ring tube and an outer ring tube that are concentric and in the same plane, and a connecting piece connecting the inner and outer ring tubes; the air inlets of the inner and outer ring tubes are connected to the same air inlet pipe, and the inner side tube walls of the inner and outer ring tubes are evenly opened with multiple air outlet holes along the circumferential direction.

2. The mold-cast double-ring argon protection ring installation structure according to claim 1 is characterized in that: The inner tube walls of the inner and outer annular tubes are evenly provided with upper and lower exhaust holes along the circumferential direction, the openings of the upper exhaust holes are inclined upward, and the openings of the lower exhaust holes are inclined downward.

3. The die-cast double-ring argon protection ring installation structure according to claim 2 is characterized in that: The inclination angles of the upper and lower rows of the air outlet holes are α1=α2=45°.

4. The die-cast double-ring argon protection ring installation structure according to claim 2 is characterized in that: The air outlet through holes on the inner ring tube and the air outlet through holes on the outer ring tube are arranged crosswise with each other at intervals.

5. The die-cast double-ring argon protection ring installation structure according to claim 4 is characterized in that: The air outlet holes on the inner ring tube and the air outlet holes on the outer ring tube are arranged crosswise with an interval of 15 degrees.

6. The mold-cast double-ring argon protection ring installation structure according to any one of claims 1 to 4, characterized in that: The diameter of the air outlet hole is φ2mm.

7. The mold-cast double-ring argon protection ring installation structure according to claim 1, characterized in that: The inner and outer annular tubes are connected via four connecting pieces evenly distributed along the circumferential direction.

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