Online degassing and filtering device for molten aluminum

Abstract

The utility model discloses an on-line degassing and filtering device for molten aluminum, which comprises a tank body provided with a head launder, a middle launder and an end launder, a filter box is positioned between the middle launder and the end launder, a degassing box is arranged on the side surface of the middle launder, a baffle is arranged between the degassing box and the middle launder, the baffle is movably connected with the middle launder, and the end launder is movably connected with the middle launder. The baffle is moved so that the interior of the degassing box can be communicated with or disconnected from the middle launder. According to the device, the tank body provided with the head launder, the middle launder and the end launder is arranged, uniform flowing of molten aluminum can be achieved, the filter box is arranged between the middle launder and the end launder, the degassing box is arranged on the side face of the middle launder, and the baffle is arranged between the degassing box and the middle launder; the baffle is moved to enable the interior of the degassing box to be communicated with or blocked from the middle launder, so that degassing and filtering treatment are effectively switched according to actual requirements of different molten aluminum, the device is flexible to operate, the molten aluminum treatment quality can be ensured, and meanwhile, the stability and flexibility of the whole device are improved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum product purification technology, and in particular to an online degassing and filtration device for molten aluminum. Background Technology

[0002] Molten aluminum plays a very important role in the aluminum alloy casting process. It is usually formed by heating and melting aluminum ingots or by adding alloying elements to keep the molten aluminum in a molten state at high temperatures to facilitate subsequent processing. Molten aluminum has high thermal conductivity and good fluidity, and is widely used in aluminum alloy casting in the automotive industry, aerospace, home appliances and electronic products.

[0003] In the prior art, degassing machines or filters are usually used to remove gases (such as hydrogen) and inclusions from the molten aluminum in order to improve the quality of the molten aluminum and the strength of the castings.

[0004] However, traditional online degassing and filtration devices for molten aluminum have limited functionality and can only operate on one production line. They cannot flexibly select individual filtration or degassing functions according to the specific needs of the molten aluminum, which affects the filtration effect and production efficiency, thereby reducing the flexibility and adjustability of use. Utility Model Content

[0005] This invention addresses the problem that traditional online degassing and filtration devices for molten aluminum have limited functionality, operating only on a single production line and unable to flexibly select individual filtration or degassing functions based on the specific needs of the molten aluminum, thus affecting filtration efficiency and production efficiency, and reducing flexibility and adjustability. The invention provides an online degassing and filtration device for molten aluminum, with the following technical solution:

[0006] An online degassing and filtration device for molten aluminum, characterized in that it comprises:

[0007] A tank for guiding the flow of molten aluminum, the tank comprising a head channel, a middle channel and an end channel;

[0008] A filter box is located between the middle flow channel and the end flow channel, and both sides of the filter box are provided with openings that communicate with the middle flow channel and the end flow channel;

[0009] A degassing box is disposed on the side of the central flow channel, and a baffle is provided between the degassing box and the central flow channel, and the baffle is movably connected to the central flow channel;

[0010] In the assembled state, the baffle is moved to either connect or block the interior of the degassing box from the central flow channel.

[0011] In some embodiments, the baffle has a cuboid structure, and the central flow channel has an inlet and an outlet on the side near the degassing box, with the baffle located at both the inlet and the outlet.

[0012] In some embodiments, the baffle is connected to the central flow channel by a snap-fit ​​mechanism. The surfaces of the inlet and the outlet are provided with protrusions, and the side of the baffle is provided with a groove. The protrusions are snapped into the grooves so that the baffle is connected to the central flow channel.

[0013] In some embodiments, a sealing ring is provided between the baffle and the inlet and between the outlet, the sealing ring being a ceramic sealing ring or a graphite sealing ring.

[0014] In some embodiments, the tank has an L-shaped structure, and the extension direction of the first flow channel is perpendicular to the extension direction of the middle flow channel and the end flow channel; or, the tank has an I-shaped structure, and the extension direction of the first flow channel is parallel to the extension direction of the middle flow channel and the extension direction of the end flow channel.

[0015] In some embodiments, a slag pit is also included, which is connected to the filter box and the degassing box.

[0016] In some embodiments, both the filter box and the degassing box are provided with a discharge port at the bottom of their side walls, and are connected to the slag pit through the discharge port.

[0017] In some embodiments, a rotary lifting device is provided inside the degassing box, and the rotary lifting device is used to stir the molten aluminum inside the degassing box;

[0018] The degassing box is connected to a gas tank, and the control device on the degassing box is driven to blow the inert gas in the gas tank into the molten aluminum.

[0019] In some embodiments, the filter box is provided with a plurality of screens, which are arranged at intervals along the conveying direction of the molten aluminum, and the screens are ceramic screens.

[0020] The technological advancements achieved by this invention compared to existing technologies are as follows:

[0021] This invention utilizes a tank with a head channel, a middle channel, and an end channel to achieve uniform flow of molten aluminum. A filter box is installed between the middle channel and the end channels, and a degassing box is located on the side of the middle channel. A baffle is installed between the degassing box and the middle channel. During use, the baffle can be moved to connect or block the interior of the degassing box with the middle channel, thereby effectively switching between degassing and filtration according to the actual needs of different molten aluminum. The device is flexible in operation and can ensure the quality of molten aluminum treatment, while also improving the stability and flexibility of the entire device. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of the online degassing and filtration device for molten aluminum according to this utility model;

[0025] Figure 2 This is a schematic diagram of the central flow channel in this utility model;

[0026] Figure 3 This is a partial schematic diagram of the filter box in this utility model;

[0027] Figure 4 This is a schematic diagram of an online degassing and filtration device for molten aluminum in one embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of an online degassing and filtration device for molten aluminum in another embodiment of the present invention.

[0029] In the diagram: 1. Tank body; 11. First flow channel; 110. First liquid inlet; 111. Second liquid inlet; 12. Middle flow channel; 120. Inlet; 121. Outlet; 13. End flow channel; 2. Filter box; 21. Opening; 22. Screen; 3. Degassing box; 31. Rotary lifting equipment; 32. Control equipment; 4. Baffle; 5. Protrusion; 6. Groove; 7. Sealing ring; 8. Slag pit; 9. Discharge port; 10. Gas tank. Detailed Implementation

[0030] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0031] like Figures 1 to 5As shown, this utility model discloses an online degassing and filtration device for molten aluminum, including a tank 1, a filter box 2, and a degassing box 3. The tank 1 is used to guide the flow of molten aluminum. The cross-sectional shape of the tank 1 can be a trapezoidal structure, a V-shaped structure, or a U-shaped structure, as long as it can accommodate molten aluminum and guide its flow. The tank 1 includes a head flow channel 11, a middle flow channel 12, and an end flow channel 13. In one example, the cross-sectional shape of the first flow channel 11, the middle flow channel 12, and the end flow channel 13 are all trapezoidal. The trapezoidal structure of the flow channels allows the molten aluminum to flow more smoothly, reducing turbulence and eddies, and effectively improving stability. During use, the first flow channel 11 is the inlet of the molten aluminum, used to receive the high-temperature molten aluminum from the upstream process (e.g., a holding furnace) and guide it into the middle flow channel 12, which serves as a transfer channel connecting the first and end flow channels. The end flow channel 13 is located at the outlet of the tank body 1 and is used to transport the processed molten aluminum to subsequent processes (e.g., a casting machine). In the direction of molten aluminum transport (e.g., ... Figure 1 (As shown in the y direction), the middle flow channel 12 is higher than the end flow channel 13 and lower than the head flow channel 11. At the same time, the head flow channel 11, the middle flow channel 1, and the end flow channel 13 all have an inclination angle relative to the ground. The inclination angle can be 3° or 5°, etc., and can be adapted to meet the requirements to facilitate smooth aluminum liquid transportation and avoid accumulation and blockage.

[0032] Continue to refer to Figures 1 to 5 Molten aluminum is typically at high temperatures and contains a certain amount of dissolved gases (such as oxygen or hydrogen). Therefore, appropriate equipment is needed to treat these dissolved gases to improve the quality of the molten aluminum. The online degassing and filtration device for molten aluminum includes a filter box 2, located between a central flow channel 12 and an end flow channel 13. The filter box 2 is used to remove particulate impurities from the molten aluminum. Both sides of the filter box 2 have openings 21 communicating with the central flow channel 12 and the end flow channel 13, allowing the molten aluminum to smoothly enter the filter box 2 from the central flow channel 12 and flow into the end flow channel 13 after filtration. The middle flow channel 13 proceeds to the next process. The degassing box 3 is located on the side of the middle flow channel 12, that is, the degassing box 3 and the filter box 2 are arranged in an L-shape. The degassing box 3 is used to remove gas inclusions from the aluminum liquid. The degassing box 3 contains an inert gas, which can promote the precipitation of impurity gases such as hydrogen in the aluminum liquid, such as argon or nitrogen. It can be adapted according to the needs. A baffle 4 is provided between the degassing box 3 and the middle flow channel 12. The baffle 4 is movably connected to the middle flow channel 12. The movable connection method can be adapted according to the needs.

[0033] In the assembled state, the operator can flexibly adjust the position of the baffle 4 according to the degassing process requirements. When degassing is required, the baffle 4 is moved and opened to connect the interior of the degassing box 3 with the middle flow channel 12. The molten aluminum enters the degassing box 3 from the first flow channel 11 through the middle flow channel 12 and is degassed using inert gas. After degassing, the molten aluminum flows through the middle flow channel 12 to the filter box 2 for further processing, and finally flows through the end flow channel 13 to the next process. When degassing is not required, the baffle 4 is closed to block the interior of the degassing box 3 from the middle flow channel 12. The molten aluminum directly enters the filter box 2 from the first flow channel 11 through the middle flow channel 12 to remove impurities. After processing, it enters the next process through the end flow channel 13. This allows for effective switching between degassing and filtration processes according to the actual needs of different molten aluminum. The device is flexible in operation and ensures the quality of molten aluminum processing, while also improving the stability and flexibility of the entire device.

[0034] In some embodiments, such as Figure 1 and Figure 2 As shown, the middle flow channel 12 is provided with an inlet 120 and an outlet 121 on the side near the degassing box 3 to guide the molten aluminum into the degassing box 3. Baffles 4 are located at both the inlet 120 and the outlet 121. The shape of the baffles 4 can be a cuboid or a circular structure, etc. In one example, the baffles 4 are cuboid and match the shape of the inlet 120 and the outlet 121. When in use, they can completely cover the inlet 120 and the outlet 121, thereby blocking the flow path between the degassing box 3 and the middle flow channel, preventing the molten aluminum from entering the degassing box 3 when it is not degassing. The baffles 4 can flexibly control the flow path of the molten aluminum, making the flow control of the molten aluminum more precise at different process stages, thereby improving the processing efficiency and flow stability of the molten aluminum and effectively ensuring the quality of aluminum products.

[0035] In some embodiments, such as Figures 1 to 2 As shown, the baffle 4 is connected to the central flow channel 12 by a snap-fit ​​connection. The surfaces of the inlet 120 and outlet 121 are provided with protrusions 5, and the side of the baffle 4 is provided with a groove 6, which can match the protrusions 5. In the assembled state, the operator moves along the extension direction of the protrusions 5 (e.g., ...). Figure 2 (In the opposite direction of the z-direction shown), the baffle 4 is firmly secured to the protrusion 5 on the surface of the central flow channel 12, that is, the protrusion 5 is engaged in the groove 6, so that the baffle 4 is connected to the central flow channel 12, thereby ensuring that the baffle 4 will not shift or loosen during use. For example, as shown Figure 4 As shown, when the groove 6 on the baffle 4 approaches and engages with the protrusion 5, it effectively blocks the channel between the central flow channel 12 and the degassing box 3, allowing the molten aluminum to directly enter the filter box 2 for filtration through the central flow channel 12, while ensuring that the molten aluminum does not flow into the degassing box 3. Figure 1 and Figure 5As shown, when the groove 6 on the baffle 4 moves away from the protrusion 5 and is disassembled from the protrusion 5, the molten aluminum can smoothly enter the central flow channel 12 from the inlet 120 and pass through the degassing box 3. After the processing is completed, it re-enters the filter box 2 from the outlet 121 for filtration, thereby improving the efficiency and safety of online degassing and filtration of molten aluminum.

[0036] In some embodiments, continue to refer to Figure 2 The sealing ring 7 is disposed within the groove 6 of the baffle 4. The sealing ring 7 ensures the seal between the baffle 4 and the inlet 120 and the outlet 121. In the assembled state, the sealing ring 7 is located between the baffle 4 and the inlet 120 and the outlet 121, and is in close contact with the surfaces of the inlet 120 and the outlet 121, forming an effective sealing surface. This prevents leakage of molten aluminum during the non-degassing stage, which could affect the quality of subsequent molten aluminum. The material of the sealing ring 7 can be adapted to meet the stringent sealing requirements of high-temperature molten aluminum flow environments. In one example, the sealing ring 7 is a ceramic sealing ring. Ceramic sealing rings are characterized by high temperature resistance, corrosion resistance, and wear resistance. During use, ceramic sealing rings can effectively prevent sealing failure caused by high temperature, pressure changes, or the movement of baffle 4 when molten aluminum flows through inlet 120 and outlet 121, thereby ensuring the quality of subsequent molten aluminum treatment and extending service life. In another example, sealing ring 7 is a graphite sealing ring. Graphite sealing rings have strong flexibility, high temperature resistance, and corrosion resistance, and can effectively adapt to thermal expansion changes in high temperature environments. During use, they can reduce friction, thereby further improving the stability of the device.

[0037] In some embodiments, the structure of the tank 1 can be adapted as needed. The first flow channel 11 has a U-shaped structure and includes a first inlet 110 and a second inlet 111. Molten aluminum enters the flow channel through both the first inlet 110 and the second inlet 111 for subsequent degassing and filtration. For example, when the flow rate of the molten aluminum is high, the first inlet 110 is used. Figure 1 and Figure 4 As shown, at this time, the tank 1 has an L-shaped structure, and the extension direction of the head flow channel 11 is (as shown in the figure). Figure 4 The x-direction shown in the figure is related to the extension directions of the middle flow channel 12 and the end flow channel 13 (as shown in the figure). Figure 4 As shown in the diagram (y-direction), the molten aluminum, after flowing through the first flow channel 11, will flow vertically into the middle flow channel 12 and be processed by the degassing box 3 and the filter box 2 before finally flowing into the end flow channel 13. This allows for better control of the flow rate and direction of the molten aluminum, reducing dead zones and irregular flow, and ensuring a more uniform and efficient processing. For example, when the molten aluminum is viscous and has a slow flow, a second inlet 111 can be used, such as... Figure 5As shown, at this time, the tank 1 has an I-shaped structure, and the extension direction of the first flow channel 11 (as shown in Figure 5, the y-direction) is the same as the extension direction of the middle flow channel 12 (as shown in Figure 5, the y-direction). Figure 5 The y-direction shown in the figure) and the extension direction of the end flow channel 13 (as shown in the figure) Figure 5 As shown in the diagram (in the y-direction), the I-shaped structure of the tank 1 simplifies the flow path of the molten aluminum, ensuring a smoother and more uniform flow of the thicker molten aluminum. For example, when the molten aluminum flow rate is high, the first inlet 110 and the second inlet 111 can be used simultaneously to ensure that the molten aluminum quickly passes through the flow channel to enter the degassing box 3 or the filter box 2 for effective treatment.

[0038] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, it also includes a slag pit 8, which is used to collect and discharge impurities and slag from the processing. The shape and structure of the slag pit 8 can be a cuboid or a column, as long as it can accommodate aluminum molten slag and impurities. This application does not impose too many restrictions on this. The slag pit 8 is connected to the filter box 2 and the degassing box 3. The connection can be made by means of pipelines to facilitate the subsequent centralized treatment of waste slag, thereby effectively protecting the environment.

[0039] In some embodiments, both the filter box 2 and the degassing box 3 are provided with discharge ports 9 at the bottom of their side walls, and are connected to the slag pit 8 through the discharge ports 9. The shape of the discharge port 9 can be a rectangular structure or an annular structure, so that the waste slag can be discharged evenly after the aluminum liquid is treated. In one example (not shown in the figure), the discharge port is an annular structure and has a matching pipe between it and the slag pit. One end of the pipe is connected to the discharge port, and the other end is placed in the slag pit. A filter screen is provided at the other end of the pipe. The filter screen can effectively filter larger impurities and can perform preliminary filtration. Smaller impurities enter the slag pit for subsequent centralized treatment.

[0040] In some embodiments, such as Figures 1 to 5As shown, a rotary lifting device 31 is installed inside the degassing box 3. One end of the rotary lifting device 31 is installed on the inside of the box cover 30 of the degassing box 3. The rotary lifting device 31 is used to stir the aluminum liquid in the degassing box 3. The degassing box 3 is connected to a gas tank 10, which contains an inert gas. The inert gas is used to degas the aluminum liquid. The inert gas can be nitrogen or argon, and can be set according to the requirements. During use, the operator drives the control device 32 on the degassing box 3 to blow the inert gas in the gas tank 10 into the aluminum liquid for degassing treatment. In one example, the rotary lifting device 31 serves as a stirring mechanism, continuously generating a stirring effect within the degassing tank 3. Its rotation drives the molten aluminum to circulate and stir within the tank, resulting in a more uniform distribution of bubbles and gases in the molten aluminum. This improves the fluidity of the molten aluminum, allowing bubbles to rise more easily to the surface. Simultaneously, nitrogen is used as the inert gas, blown into the molten aluminum. The flow within the degassing tank 3 creates a large number of dispersed bubbles. These bubbles effectively absorb and remove hydrogen and oxide inclusions from the molten aluminum using the gas partial pressure difference and surface adsorption principles. Due to their small size and uniform dispersion, the bubbles rise slowly in a spiral shape under the influence of the rotating molten aluminum, preventing continuous upward airflow upon contact with the aluminum. This significantly improves the purification effect, ensuring the molten aluminum meets the expected quality requirements. It should be noted that the stirring mechanism can be made of high-temperature resistant and corrosion-resistant alloys or ceramics to ensure it is not damaged in high-temperature molten aluminum environments, achieving stability and durability under high-temperature conditions.

[0041] In some embodiments, such as Figures 1 to 3 As shown, the filter box 2 is equipped with multiple screens 22, which are arranged along the conveying direction of the molten aluminum (e.g., ...). Figure 3 As shown in the y-direction, the screens 22 are arranged at intervals to screen out impurities in the molten aluminum. The number of screens 22 can be two or four, which can be adapted to the needs. The mesh sizes of the multiple screens 22 are all different, which can screen out impurities of different sizes in sequence. At the same time, the material of the screens 22 can be adapted to the needs. For example, the screens 22 are ceramic screens. Ceramic screens have the characteristics of heat resistance and corrosion resistance. During use, the molten aluminum flows through the mesh of the ceramic screen, which can effectively filter out the impurities. In addition, the screens 22 are detachably connected to the filter box 2, which is convenient for operators to clean in time after use, and to disassemble and replace during use, thereby improving the filtration effect and work efficiency of the molten aluminum.

[0042] The working principle of the online degassing and filtration device for molten aluminum in this application is as follows:

[0043] like Figures 1 to 5As shown, when the online degassing and filtration device for molten aluminum starts working, the high-temperature molten aluminum from the upstream process (e.g., the holding furnace) flows into the first flow channel 11 of the tank 1. During the flow of the molten aluminum, the operator can choose whether a degassing process is required based on the characteristics of the molten aluminum. When degassing is not required, the operator inserts the baffle 4 into the inlet 120 and outlet 121 of the middle flow channel 12 to block the channel between the middle flow channel 12 and the degassing box 3. The molten aluminum then directly enters the filter box 2 for filtration. When degassing and filtration are required, the operator removes the baffle 4 from the middle flow channel 12 to allow the molten aluminum to pass through the filter box 3. 3. Internally connected, molten aluminum enters the degassing box 3 from the head flow channel 11 through the inlet 120 of the middle flow channel 12. The rotary lifting device 31 on the degassing box 3 drives the molten aluminum to circulate and stir within the degassing box 3, making the bubbles and gases in the molten aluminum more evenly distributed. At the same time, nitrogen gas in the gas tank 10 is blown into the molten aluminum. The bubbles form a large number of diffuse bubbles through the flow inside the degassing box 3. These bubbles effectively absorb and carry out hydrogen gas and oxide inclusions in the molten aluminum by utilizing the gas partial pressure difference and surface adsorption principle. Because the bubbles are small and evenly dispersed, they float slowly in a spiral shape under the drive of the rotating molten metal. When they come into contact with the molten aluminum, they do not generate a continuous rising airflow, thus achieving the degassing effect.

[0044] Next, the degassed aluminum liquid flows out through the outlet 121 of the central flow channel 12 and then enters the filter box 2. Inside the filter box 2, there are multiple screens 22 for filtering solid particles and impurities in the aluminum liquid. The aluminum liquid flows through multiple screens with different mesh sizes to achieve the filtration effect.

[0045] Finally, the slag and debris from the degassing and filtration process flow into the slag pit 8 through the discharge port 9 for subsequent centralized processing. The treated molten aluminum then flows through the end flow channel 13 to the next process (e.g., a casting machine) for further processing, thus completing the online degassing and filtration of the molten aluminum and ensuring the quality and purity of the molten aluminum.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An online degassing and filtration device for molten aluminum, characterized in that, include: A tank for guiding the flow of molten aluminum, the tank comprising a head channel, a middle channel and an end channel; A filter box is located between the middle flow channel and the end flow channel, and both sides of the filter box are provided with openings that communicate with the middle flow channel and the end flow channel; A degassing box is disposed on the side of the central flow channel, and a baffle is provided between the degassing box and the central flow channel, and the baffle is movably connected to the central flow channel; In the assembled state, the baffle is moved to either connect or block the interior of the degassing box from the central flow channel.

2. The online degassing and filtration device for molten aluminum according to claim 1, characterized in that, The baffle has a cuboid structure, and the central flow channel has an inlet and an outlet on the side near the degassing box. The baffle is located at both the inlet and the outlet.

3. The online degassing and filtration device for molten aluminum according to claim 2, characterized in that, The baffle is connected to the central flow channel by a snap-fit ​​mechanism. The surfaces of the inlet and the outlet are provided with protrusions, and the side of the baffle is provided with a groove. The protrusions snap into the grooves so that the baffle is connected to the central flow channel.

4. The online degassing and filtration device for molten aluminum according to claim 2, characterized in that, A sealing ring is provided between the baffle and the inlet and between the baffle and the outlet. The sealing ring is a ceramic sealing ring or a graphite sealing ring.

5. The online degassing and filtration device for molten aluminum according to claim 1, characterized in that, The trough has an L-shaped structure, and the extension direction of the first flow channel is perpendicular to the extension direction of the middle flow channel and the end flow channel; or, the trough has an I-shaped structure, and the extension direction of the first flow channel is parallel to the extension direction of the middle flow channel and the extension direction of the end flow channel.

6. The online degassing and filtration device for molten aluminum according to claim 1, characterized in that, It also includes slag pits, all of which are connected to the filter box and the degassing box.

7. The online degassing and filtration device for molten aluminum according to claim 6, characterized in that, Both the filter box and the degassing box have discharge ports at the bottom of their side walls, and these discharge ports are connected to the slag pit.

8. The online degassing and filtration device for molten aluminum according to claim 1, characterized in that, The degassing chamber is equipped with a rotary lifting device, which is used to stir the molten aluminum in the degassing chamber. The degassing box is connected to a gas tank, and the control device on the degassing box is driven to blow the inert gas in the gas tank into the molten aluminum.

9. The online degassing and filtration device for molten aluminum according to claim 1, characterized in that, The filter box is equipped with multiple screens, which are arranged at intervals along the conveying direction of the molten aluminum. The screens are ceramic screens.

Images