A holding furnace for molten aluminum

Abstract

The utility model discloses a kind of aluminium liquid holding furnace, it is related to boiler technical field, including furnace body, the top end of the furnace body is movably connected with furnace cover, the top end of the furnace cover is installed with receiving seat, the furnace body outer wall is communicated with flow port, the top surface of the receiving seat is communicated with three-way pipe, one end of the three-way pipe is communicated with straight-through pipe, the other end of the three-way pipe is communicated with elbow pipe, the utility model is stored when aluminium liquid, by closing flow port outer wall ceramic valve, opening ball valve makes straight-through pipe intercommunication furnace body and outside, again, the gas of greater density than air is introduced, using the principle of gas expelling excess air, let aluminium liquid liquid level surface layer fill with protective gas, realize the effective anti-oxidation protection of aluminium liquid, not only make aluminium liquid more resistant to storage, but also can improve the quality of the castings prepared subsequently using the aluminium liquid, reduce the casting defects caused by oxidation problem, improve the overall performance and quality of castings.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of boiler, especially to a liquid aluminum holding furnace. BACKGROUND

[0002] The liquid aluminum holding furnace is a special industrial equipment for storing and preserving liquid aluminum during the smelting and casting process of aluminum and aluminum alloy, which can maintain the liquid aluminum at a specific temperature range. This is crucial for the subsequent processing of aluminum alloy die casting, casting, and other processes. Different aluminum alloys have different optimal processing temperature ranges. The holding furnace can accurately control the temperature to ensure that the flowability and other properties of the liquid aluminum meet the processing requirements, and is widely used in the aluminum processing industry such as aluminum alloy die casting, casting, and aluminum profile processing. In the die casting workshop, the holding furnace continuously provides the die casting machine with aluminum liquid of appropriate temperature and good quality; in the casting plant, it is used to store and adjust the temperature of the liquid aluminum to meet the requirements of different casting processes.

[0003] For example, patent CN118758060A "A liquid aluminum heating holding furnace" includes a furnace body and an upper cover arranged on the upper end surface of the furnace body. The surface of the upper cover is provided with a through hole, and the through hole is provided with a funnel-shaped liquid collecting shell. The outlet end of the liquid collecting shell is connected with a self-sealing channel, and the outlet end of the self-sealing channel is communicated with the inside of the furnace body. A holding shell for storing liquid aluminum is arranged in the furnace body, and two liquid storage chambers are arranged in the holding shell. The upper surface of the holding shell is provided with two first and second openings respectively connected with different liquid storage chambers. A driving member is arranged outside the furnace body to drive the holding shell to rotate. A plurality of nozzles are arranged on the circumferential surface of the liquid collecting shell, and the nozzles are connected with a gas pump.

[0004] Aluminum is a highly active metal that easily reacts with oxygen in the air, forming an aluminum oxide film on the surface of the liquid aluminum. When this oxide film is mixed into the casting, it will adversely affect the quality of the casting, causing defects such as pores, inclusions, and other defects, which severely reduce its performance and quality. In the specific environment of the liquid aluminum holding furnace, high temperature conditions significantly accelerate the oxidation process of the liquid aluminum. However, the current market aluminum liquid holding furnace, in its liquid aluminum storage part, mostly does not take effective targeted measures to inhibit the oxidation of liquid aluminum, which undoubtedly makes the liquid aluminum more susceptible to oxidation during storage, greatly increasing the risk of the formation and mixing of the oxide film into the casting, thereby posing a serious threat to the quality of the subsequent casting, easily leading to a series of problems such as increased scrap rate, unstable product performance, and other issues, which urgently need to be improved and optimized. SUMMARY

[0005] The purpose of this invention is to solve the problem that in the high-temperature environment of aluminum liquid holding furnaces, aluminum liquid easily reacts with oxygen in the air to form aluminum oxide, which forms an oxide film on the surface of the aluminum liquid. If the oxide film enters the casting, it will affect the quality of the casting. Therefore, this invention proposes an aluminum liquid holding furnace.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an aluminum liquid heat preservation furnace, comprising a furnace body, a furnace cover movably connected to the top of the furnace body, a storage seat installed at the top of the furnace cover, an outlet connected to the outer wall of the furnace body, a tee pipe connected to the top surface of the storage seat, a straight pipe connected to one end of the tee pipe, a bend pipe connected to the other end of the tee pipe, an air inlet pipe inserted into the inner wall of the bottom end of the bend pipe, the diameter of the outer wall of the air inlet pipe being smaller than the diameter of the inner wall of the tee pipe, the vertical sections of the air inlet pipe and the tee pipe being located on the same axis, a ball valve fixedly connected to the top of the straight pipe, and a ceramic valve installed on the outer wall of the outlet.

[0007] Preferably, the bottom end of the air intake pipe is connected to a conical nozzle, and the area of ​​the top opening of the conical nozzle is larger than the area of ​​the bottom opening.

[0008] Preferably, the inner walls of the furnace body and the inlet are both fixedly connected with insulation layers, and the inner wall of the furnace body is provided with a refractory lining layer, which is composite on the side wall of the insulation layer.

[0009] Preferably, a furnace hoop is fixedly connected to the outer wall of the furnace body.

[0010] Preferably, a mounting base is fixedly connected to the outer wall of the furnace body, a pin is inserted into the inner wall of the mounting base, and a support frame is movably sleeved on the outer wall of the pin.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, during the storage of molten aluminum, the ceramic valve on the outer wall of the outlet is closed, the ball valve is opened to connect the furnace body to the outside through the straight pipe, and a protective gas with a density greater than air is introduced. By utilizing the principle of gas displacing excess air, the surface of the molten aluminum is filled with protective gas, which effectively protects the molten aluminum from oxidation. This not only makes the molten aluminum more durable for storage, but also improves the quality of castings subsequently made from the molten aluminum, reduces casting defects caused by oxidation, and improves the overall performance and quality of the castings.

[0013] 2. In this utility model, by reasonably setting the outlet position and using the ladle to receive the flowing aluminum liquid, it is convenient to transport the aluminum liquid to the next processing stage. Moreover, in the storage state, the aluminum liquid can be properly managed by controlling the valves and other operations, making the entire process of storing and retrieving the aluminum liquid in the holding furnace more orderly and convenient.

[0014] 3、The utility model discloses a high alumina brick or corundum brick material constitutes the refractory inner lining and the ceramic fiber material composition heat preservation layer, prevent the molten aluminum erosion furnace body, reduce the heat loss, improve the energy utilization efficiency, thereby prolong the service life of furnace body, promote the molten aluminum storage stability and quality, provide the powerful guarantee for production. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A three-dimensional structure schematic diagram of the molten aluminum heat preservation furnace is provided for the utility model;

[0016] Figure 2 A top view of the molten aluminum heat preservation furnace is provided for the utility model;

[0017] Figure 3 A front view of the molten aluminum heat preservation furnace is provided for the utility model;

[0018] Figure 4 A Figure 3 The local structure enlarged effect drawing of A place in the middle;

[0019] Figure 5 An internal structure split effect drawing of the tee pipe in the molten aluminum heat preservation furnace is provided for the utility model.

[0020] Legend: 1, furnace body;2, mounting seat;3, bolt;4, support frame;5, flow port;6, furnace hoop;7, furnace cover;8, storage seat;9, tee pipe;10, elbow;11, straight pipe;12, ball valve;13, air inlet pipe;14, heat preservation layer;15, refractory inner lining;16, conical nozzle. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the drawings and examples. It should be explained that, in the case of no conflict, the embodiment of the application and the features in the embodiment can be combined with each other.

[0022] In the following description, a lot of specific details are set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from the description, therefore, the utility model is not limited to the specific embodiment disclosed in the following disclosure.

[0023] Example one: as Figure 1 - Figure 5As shown, the utility model provides a kind of molten aluminium heat preservation furnace, including furnace body 1, the top end of furnace body 1 is movably connected with furnace cover 7, and the top end of furnace cover 7 is installed with receiving seat 8, and the outer lateral wall of furnace body 1 is communicated with flow port 5, and the top surface of receiving seat 8 is communicated with three-way pipe 9, and one end of three-way pipe 9 is communicated with straight pipe 11, and the other end of three-way pipe 9 is communicated with elbow pipe 10, and the bottom end inner lateral wall of elbow pipe 10 is inserted with air inlet pipe 13, and the outer lateral wall diameter of air inlet pipe 13 is less than the inner lateral wall diameter of three-way pipe 9, and the vertical section of air inlet pipe 13 and three-way pipe 9 is located on the same axis, and the top end of straight pipe 11 is fixedly connected with ball valve 12, and the outer lateral wall of flow port 5 is installed with ceramic valve.

[0024] The specific settings and effects of the embodiment will be described below, a sealing ring is additionally provided at the connection between the furnace body 1 and the furnace cover 7 to ensure the sealing of the inside of the furnace body 1, and the furnace body 1 with the furnace cover 7 installed has two air-permeable positions, one of which is located on the receiving seat 8 and is communicated with the outside along the elbow pipe 10 and the straight pipe 11 respectively, and the other of which is communicated with the outside obliquely upward along the flow port 5, the flow port 5 is installed on the furnace body 1 close to the top, and when the molten aluminium is poured, the molten aluminium liquid surface is generally below the bottom opening of the flow port 5, the molten aluminium in the storage state will not flow into the flow port 5, and only when the furnace body 1 is inclined, the molten aluminium will flow out of the flow port 5, the flowed-out molten aluminium is received by a pouring ladle and transported to the next processing link, and in the storage state of the molten aluminium, the ceramic valve on the outer lateral wall of the flow port 5 is closed, then the ball valve 12 is opened, the straight pipe 11 is communicated with the outside of the furnace body 1, the protective gas is introduced into the elbow pipe 10, the protective gas is selected from the gas with a larger sealing than air, the protective gas is directly introduced into the surface layer of the molten aluminium liquid along the air inlet pipe 13 and pushes the excess air upward, so that the air flows out along the gap between the inner lateral wall of the three-way pipe 9 and the outer lateral wall of the elbow pipe 10 until the air is discharged from the straight pipe 11, the introduced protective gas and the discharged air do not interfere with each other, until the surface layer of the molten aluminium liquid is filled with the protective gas, the anti-oxidation protection function of the molten aluminium is realized, the molten aluminium in the molten aluminium heat preservation furnace is more resistant to storage, and the quality of the castings prepared from the molten aluminium is improved.

[0025] As shown in Embodiment Two, Figure 3 , Figure 4 and Figure 5 , the bottom end of the air inlet pipe 13 is communicated with a tapered nozzle 16, the top end opening area of the tapered nozzle 16 is larger than the bottom end opening area. The inner lateral wall of the furnace body 1 and the flow port 5 is fixedly connected with a heat preservation layer 14, the inner lateral wall of the furnace body 1 is provided with a refractory lining layer 15, and the refractory lining layer 15 is compounded on the lateral wall of the heat preservation layer 14. The outer lateral wall of the furnace body 1 is fixedly connected with a furnace hoop 6. The outer lateral wall of the furnace body 1 is fixedly connected with a mounting seat 2, and the inner lateral wall of the mounting seat 2 is inserted with a bolt 3. The outer lateral wall of the bolt 3 movably sheaths a support frame 4.

[0026] The effect achieved by the whole embodiment is that the bottom end of the air inlet pipe 13 is provided with a tapered nozzle 16, the through opening of the tapered nozzle 16 is designed to effectively avoid air entering, since the bottom end opening of the tapered nozzle 16 is small, the protective gas enters the elbow pipe 10 and the air inlet pipe 13, the through pressure of the tapered nozzle 16 is increased, the protective gas can quickly pass into the bottom air, and an insulating protective effect is formed on the surface of the aluminum liquid. The refractory lining 15 is used for directly contacting the aluminum liquid and preventing the aluminum liquid from eroding the furnace body 1. The refractory material of the refractory lining 15, such as high-alumina brick and corundum brick, has good high-temperature resistance and aluminum liquid erosion resistance. The refractory lining 15 can ensure the integrity of the internal structure of the furnace body 1, prolong the service life of the furnace body 1, and the heat preservation layer 14 is mainly composed of ceramic fiber and other heat preservation materials. The material of the heat preservation layer 14 has the advantages of low thermal conductivity, light weight, high temperature resistance and the like. The heat preservation layer 14 reduces heat loss and improves energy utilization efficiency. The ceramic valve has excellent high-temperature resistance, and its high-temperature resistance is usually in the range of 1600-1800°C. By virtue of this characteristic, the ceramic valve is installed at the flow port 5 during the operation of the aluminum liquid holding furnace, and the opening and cutting off of the aluminum liquid flow can be accurately and effectively realized by controlling the ceramic valve. The mounting seat 2 is arranged on the outside of the furnace body 1, and when the furnace body 1 needs to be moved, the furnace body 1 can be lifted by the supporting frame 4.

[0027] The use method and working principle of the device are as follows: firstly, in the aluminum liquid storage state, the aluminum liquid surface is usually below the bottom opening of the flow port 5, the ceramic valve on the outside wall of the flow port 5 is closed, and the ball valve 12 is opened to connect the straight pipe 11 with the outside of the furnace body 1.

[0028] Then, the protective gas with a density greater than that of air is introduced into the elbow pipe 10, the gas reaches the surface layer of the aluminum liquid through the air inlet pipe 13, and the excess air is pushed upwards to flow out from the gap between the inner wall of the three-way pipe 9 and the outer wall of the elbow pipe 10, and is discharged from the straight pipe 11. The tapered nozzle 16 is arranged at the bottom end of the air inlet pipe 13, which can increase the gas passing pressure and promote the protective gas to quickly pass into the bottom air to form an insulating protective effect on the surface of the aluminum liquid.

[0029] At the same time, the furnace body 1 is provided with a refractory lining 15 made of high-alumina brick, corundum brick and other refractory materials, which can directly contact the aluminum liquid, prevent the aluminum liquid from eroding the furnace body 1, ensure the integrity of the internal structure and prolong the service life of the furnace body 1. The outer side of the furnace body 1 is also provided with a heat preservation layer 14 composed of ceramic fiber and other low-thermal-conductivity, light-weight and high-temperature-resistant materials, which can reduce heat loss and improve energy utilization efficiency.

[0030] In addition, a specially designed mounting seat 2 is arranged on the outer wall side of the furnace body 1, and when the furnace body 1 needs to be moved, the furnace body 1 can be lifted by the supporting frame 4 matched therewith.

[0031] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in other forms, and any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields with equivalent changes, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical scheme of the present application still falls within the protection scope of the present application.

Claims

1. A holding furnace for molten aluminum comprising a furnace body (1), characterized in that: The top end of the furnace body (1) is movably connected with a furnace cover (7), the top end of the furnace cover (7) is provided with a receiving seat (8), the outer side wall of the furnace body (1) is communicated with a flow port (5), the top surface of the receiving seat (8) is communicated with a tee pipe (9), one end of the tee pipe (9) is communicated with a straight pipe (11), the other end of the tee pipe (9) is communicated with a bend pipe (10), the bottom end of the inner side wall of the bend pipe (10) is inserted with an air inlet pipe (13), the outer side wall diameter of the air inlet pipe (13) is smaller than the inner side wall diameter of the tee pipe (9), the vertical sections of the air inlet pipe (13) and the tee pipe (9) are located on the same axis, the top end of the straight pipe (11) is fixedly connected with a ball valve (12), and the outer side wall of the flow port (5) is provided with a ceramic valve.

2. A holding furnace for molten aluminium as claimed in claim 1 wherein: The bottom end of the air inlet pipe (13) is communicated with a tapered nozzle (16), and the area of the top end opening of the tapered nozzle (16) is larger than the area of the bottom end opening.

3. A holding furnace for molten aluminum as recited in claim 1, characterized in that: The inner side walls of the furnace body (1) and the flow port (5) are fixedly connected with a heat preservation layer (14), the inner side wall of the furnace body (1) is provided with a refractory lining (15), and the refractory lining (15) is compounded on the side wall of the heat preservation layer (14).

4. A holding furnace for molten aluminum as recited in claim 1, characterized in that: The outer side wall of the furnace body (1) is fixedly connected with a furnace clamp (6).

5. The holding furnace for molten aluminum according to claim 1, characterized in that: The outer side wall of the furnace body (1) is fixedly connected with a mounting seat (2), the inner side wall of the mounting seat (2) is inserted with a latch (3); and the outer side wall of the latch (3) is movably sleeved with a support frame (4).

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