Degassing device for low-pressure pouring of aluminum alloy

Abstract

The utility model discloses an aluminum alloy low-pressure pouring degassing device which comprises a quantitative furnace, a gas guide pipe is arranged in the quantitative furnace, the gas guide pipe is longitudinally arranged, a refractory layer is arranged on the peripheral face of the gas guide pipe, a gas guide hole is formed in the bottom of the gas guide pipe, and the gas guide hole is close to the inner bottom of the quantitative furnace. The upper part of the gas guide pipe penetrates out of the quantitative furnace and is communicated with one end of a heat-resistant gas pipe through a flange; the other end of the heat-resistant gas pipe is communicated with an argon bottle. According to the utility model, after the aluminum alloy melt enters the quantitative furnace, the argon bottle is opened, so that argon enters the gas guide pipe through the heat-resistant gas pipe, the joint and the connecting pipe in sequence, then is discharged from the gas guide hole and enters the aluminum alloy melt, and after entering the melt, the argon forms bubbles and ascends, so that hydrogen is gradually separated out from the melt and is attached to the surfaces of the argon bubbles; along with the rising of argon bubbles, molten aluminum alloy is brought out, and the hydrogen content is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metal processing, in particular to a degassing device for low-pressure pouring of aluminum alloy. Background Art

[0002] Aluminum alloys are widely used in various industries, including automotive, aviation, and construction, due to their excellent physical properties, chemical stability, and low cost. However, controlling the melt quality is extremely important during the aluminum alloy production process, particularly controlling the hydrogen content. Hydrogen is one of the most common gaseous impurities in aluminum alloys. It precipitates during the cooling and solidification process, forming bubbles and causing porosity within the casting, which in turn affects the mechanical properties and surface quality of the casting.

[0003] During the aluminum alloy smelting and pouring process, the melt is highly susceptible to hydrogen absorption. This is especially true during the transfer of the molten aluminum alloy from the smelting furnace to the transfer ladle and from there to the dosing furnace. Due to exposure to the atmosphere, the molten aluminum alloy rapidly absorbs moisture from the air and releases hydrogen. Typically, after melting, the aluminum alloy is transferred to the transfer ladle, degassed, and then transferred from the transfer ladle to the dosing furnace for pouring. However, during this transfer from the transfer ladle to the dosing furnace, the molten aluminum undergoes another round of circulation, which can cause entrainment and splashing. Therefore, the hydrogen content of the molten aluminum after entering the dosing furnace can rise again and potentially exceed the specified value. Existing degassing methods often struggle to eliminate the hydrogen introduced during this stage. Therefore, even if effective degassing is performed during the smelting process, failure to further reduce the hydrogen content after circulation can still lead to defects such as porosity in the final cast product, seriously impacting the quality and service life of the casting. To address this issue, we propose a degassing device for low-pressure casting of aluminum alloys. Utility Model Content

[0004] The purpose of the utility model is to provide a degassing device for low-pressure pouring of aluminum alloys. By arranging an air guide pipe in a quantitative furnace, an inert gas connected outside the furnace is introduced into the aluminum liquid in the furnace. The hydrogen in the aluminum liquid is brought out by the inert gas, the hydrogen content in the aluminum liquid is reduced, thereby improving product performance and solving the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A degassing device for low-pressure pouring of aluminum alloy includes a dosing furnace, an air guide pipe is provided inside the dosing furnace, the air guide pipe is arranged longitudinally, a refractory layer is provided on the outer peripheral surface of the air guide pipe, an air guide hole is opened at the bottom of the air guide pipe, the air guide hole is close to the inner bottom of the dosing furnace, the upper part of the air guide pipe passes through the dosing furnace and is connected to one end of the heat-resistant air pipe through a flange, and the other end of the heat-resistant air pipe is connected to an argon gas cylinder.

[0007] Preferably, a float flowmeter is provided on the heat-resistant gas pipe.

[0008] Preferably, the connecting end of the heat-resistant air pipe and the air guide pipe is provided with a joint, and the joint is a bent pipe structure.

[0009] Preferably, the flange includes an upper flange and a lower flange, and a connecting pipe is provided on the top of the upper flange, and the connecting pipe is connected to the joint.

[0010] Preferably, the upper ends of the air guide pipe and the refractory layer penetrate into the lower flange and are fixed to the lower flange, and the upper flange and the lower flange are connected by bolts.

[0011] Preferably, a cover plate is fixed to the bottom surface of the lower flange, and the lower flange is installed on the quantitative furnace through the cover plate. A refractory cotton layer is provided on the contact surface between the cover plate and the quantitative furnace.

[0012] Preferably, a plurality of the air guide holes are arranged and surround the periphery of the air guide tube.

[0013] Preferably, a pouring port is provided on one side of the quantitative furnace, and a material inlet and outlet is provided on a side of the quantitative furnace away from the pouring port.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In the utility model, after the aluminum alloy melt enters the quantitative furnace, the argon cylinder is opened, and the argon gas passes through the heat-resistant gas pipe, the joint and the connecting pipe in sequence into the gas guide pipe, and is then discharged from the gas guide hole and enters the aluminum alloy melt. After the argon gas enters the melt, it forms bubbles and rises. The argon bubbles cause the local pressure in the aluminum alloy melt to drop, so that hydrogen gradually precipitates from the melt and adheres to the surface of the argon bubbles. Finally, as the argon bubbles rise, they are carried out of the aluminum alloy melt, thereby reducing the hydrogen content.

[0016] 2. The utility model provides a refractory layer on the outer peripheral surface of the gas guide tube to isolate the aluminum alloy melt from contact with the gas guide tube, thereby preventing the precipitation of iron elements from contaminating the aluminum alloy melt; the float flowmeter is provided to accurately control the flow rate of the introduced gas; and the refractory cotton layer is provided on the contact surface between the cover plate and the quantitative furnace to reduce heat loss and prevent condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is the axonometric drawing of the refractory layer of the present utility model;

[0019] Figure 3 This is a partial structural disassembly diagram of the utility model;

[0020] Figure 4 For the utility model Figure 3Enlarged view of point A in the middle.

[0021] In the figure: 1. Argon cylinder; 2. Float flowmeter; 3. Heat-resistant gas pipe; 4. Connector; 5. Flange; 6. Cover plate; 7. Gas guide pipe; 8. Refractory layer; 9. Gas guide hole; 10. Pouring gate; 11. Dosing furnace; 12. Material inlet and outlet; 13. Upper flange; 14. Lower flange; 15. Connecting pipe; 16. Refractory wool layer. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In order to solve the problem in the prior art that the aluminum alloy melt increases its hydrogen content after being poured into the dosing furnace, but degassing and other operations cannot be performed again in the dosing furnace, the following technical solution is provided. Please refer to Figure 1-4 ;

[0024] A degassing device for low-pressure pouring of aluminum alloy includes a dosing furnace 11, a pouring port 10 is provided on one side of the dosing furnace 11, and a material inlet and outlet 12 is provided on the side of the dosing furnace 11 away from the pouring port 10. An air guide pipe 7 is provided inside the dosing furnace 11, and the air guide pipe 7 is arranged longitudinally. The air guide pipe 7 is made of refractory steel, and a refractory layer 8 is also provided on the outer peripheral surface of the air guide pipe 7, which can isolate the aluminum alloy melt from contact with the air guide pipe 7 and prevent the precipitation of Fe elements from contaminating the aluminum alloy melt; an air guide hole 9 is opened at the bottom of the air guide pipe 7, and the air guide hole 9 is close to the inner bottom of the dosing furnace 11. Several air guide holes 9 are arranged and surround the outer periphery of the air guide pipe 7; the upper part of the air guide pipe 7 passes through the dosing furnace 11 and is connected to one end of the heat-resistant air pipe 3 through a flange 5, and the other end of the heat-resistant air pipe 3 is connected to an argon gas cylinder 1; a float flowmeter 2 is provided on the heat-resistant air pipe 3, which can control the flow of the introduced gas, which is equivalent to the function of a flow switch.

[0025] The connecting end of the heat-resistant gas pipe 3 and the gas guide pipe 7 is provided with a joint 4, and the joint 4 is a bent pipe structure; the flange 5 includes an upper flange 13 and a lower flange 14, and the top of the upper flange 13 is provided with a connecting pipe 15, which is connected to the joint 4; the upper ends of the gas guide pipe 7 and the refractory layer 8 pass through the lower flange 14 and are fixed to the lower flange 14, and the upper flange 13 and the lower flange 14 are connected by bolts; a cover plate 6 is fixed to the bottom surface of the lower flange 14, and the lower flange 14 is installed on the quantitative furnace 11 through the cover plate 6. The refractory cotton layer 16 arranged on the contact surface between the cover plate 6 and the quantitative furnace 11 can reduce heat loss.

[0026] Specifically, after degassing, the aluminum alloy melt enters the quantitative furnace 11 from the material inlet and outlet 12. At this time, the argon bottle 1 is opened, so that the argon gas enters the float flowmeter 2 from the heat-resistant gas pipe 3. The introduced gas flow is controlled by the float flowmeter 2. The argon gas passes through the joint 4 and the connecting pipe 15 in turn and enters the gas guide pipe 7, and then is discharged from the gas guide hole 9 and enters the aluminum alloy melt to bring out hydrogen.

[0027] Working principle: After the aluminum alloy melt enters the quantitative furnace 11, the argon bottle 1 is opened, and the argon passes through the heat-resistant gas pipe 3, the joint 4 and the connecting pipe 15 in sequence and enters the gas guide pipe 7, and is then discharged from the gas guide hole 9 and enters the aluminum alloy melt. After the argon gas enters the melt, it forms bubbles and rises. The argon bubbles cause the local pressure in the aluminum alloy melt to drop, causing hydrogen to gradually precipitate from the melt and adhere to the surface of the argon bubbles. Finally, as the argon bubbles rise, they are carried out of the aluminum alloy melt, thereby reducing the hydrogen content.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated 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 present invention.

Claims

1. A degassing device for low-pressure pouring of aluminum alloy, comprising a dosing furnace (11), characterized in that: An air guide pipe (7) is provided inside the quantitative furnace (11), the air guide pipe (7) is arranged longitudinally, a refractory layer (8) is provided on the outer peripheral surface of the air guide pipe (7), an air guide hole (9) is provided at the bottom of the air guide pipe (7), the air guide hole (9) is close to the inner bottom of the quantitative furnace (11), the upper part of the air guide pipe (7) passes through the quantitative furnace (11) and is connected to one end of the heat-resistant air pipe (3) through a flange (5), and the other end of the heat-resistant air pipe (3) is connected to the argon gas cylinder (1).

2. A degassing device for low-pressure pouring of aluminum alloy according to claim 1, characterized in that: The heat-resistant air pipe (3) is provided with a float flowmeter (2).

3. A degassing device for low-pressure pouring of aluminum alloy according to claim 2, characterized in that: The connection end between the heat-resistant air pipe (3) and the air guide pipe (7) is provided with a joint (4), and the joint (4) is a bent pipe structure.

4. A degassing device for low-pressure pouring of aluminum alloy according to claim 3, characterized in that: The flange (5) comprises an upper flange (13) and a lower flange (14). A connecting pipe (15) is provided on the top of the upper flange (13), and the connecting pipe (15) is connected to the joint (4).

5. The degassing device for low-pressure pouring of aluminum alloy according to claim 4, characterized in that: The upper ends of the air guide pipe (7) and the fireproof layer (8) penetrate into the lower flange (14) and are fixed to the lower flange (14), and the upper flange (13) and the lower flange (14) are connected by bolts.

6. A degassing device for low-pressure pouring of aluminum alloy according to claim 5, characterized in that: A cover plate (6) is fixed to the bottom surface of the lower flange (14), and the lower flange (14) is installed on the quantitative furnace (11) through the cover plate (6). A fire-resistant cotton layer (16) is provided on the contact surface between the cover plate (6) and the quantitative furnace (11).

7. A degassing device for low-pressure pouring of aluminum alloy according to claim 6, characterized in that: A plurality of the air guide holes (9) are arranged and surround the outer periphery of the air guide pipe (7).

8. A degassing device for low-pressure pouring of aluminum alloy according to claim 7, characterized in that: A pouring port (10) is provided on one side of the dosing furnace (11), and a material inlet and outlet (12) is provided on a side of the dosing furnace (11) away from the pouring port (10).

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