Two-stage filter box lining for aluminum and aluminum alloy melt casting

Abstract

The utility model belongs to the technical field of aluminum and aluminum alloy melt casting, and aims to provide a two-stage filter tank lining for aluminum and aluminum alloy melt casting, which comprises a filter tank body in a square structure. A first-stage filtering cavity and a second-stage filtering cavity are formed in the filtering box body, a first discharge port is formed in the middle of the bottom of the first-stage filtering cavity, and a molten aluminum inlet is formed in the side face of the upper end of the first-stage filtering cavity; the first-stage filtering cavity is connected with the first liquid storage cavity through a first communicating channel at the bottom; the first liquid storage cavity is connected with a second-stage filtering cavity, and the second-stage filtering cavity is connected with a second liquid storage cavity through a second communicating channel; and a second discharge port is formed in the middle of the bottom of the second liquid storage cavity, and a molten aluminum outlet is formed in the upper end. The utility model has the characteristics of compact structure, high product strength, high filtering efficiency, long service life and the like, and can be widely applied to the technical field of aluminum and aluminum alloy melt casting.

Description

Technical Field

[0001] This utility model relates to the field of aluminum and aluminum alloy melt casting technology, specifically, it is a liner for a two-stage filter box used in aluminum and aluminum alloy melt casting. Background Technology

[0002] With the development of my country's economy, the use of aluminum products in our daily lives and industrial production is increasing. In the aluminum and aluminum alloy casting process, the amount of inclusions in the molten aluminum has a significant impact on the quality of aluminum and aluminum alloy ingots. To improve the purity of the molten aluminum, filtration is generally used to remove non-metallic inclusions from the melt. Plate filtration is one of the most common methods for filtering molten aluminum, characterized by low cost, convenient maintenance, and high filtration efficiency. Combined with degassing furnaces, deep-bed filtration, or tubular filtration, it can meet the high-precision filtration requirements of high-end molten aluminum.

[0003] Patent application number "CN200910208535" describes a dual-stage aluminum liquid filter box with dual heating function, including a shell and a top cover. The shell is provided with an inner liner, an aluminum liquid inlet is provided on one side wall of the shell, and an aluminum liquid outlet is provided on the opposite side wall. Two filter plates, upper and lower, are installed in the inner liner, and a gas preheating burner is installed on the top cover, with the gas preheating burner facing the filter plates. However, using two filter plates to achieve dual-stage filtration results in low aluminum liquid filtration efficiency, and the top filter plate is prone to floating. Patent application number CN201620099771 describes a filter box lining structure for purifying and refining molten aluminum. It includes a filter box body cast from a non-stick aluminum castable made of fused silica. The filter box body is equipped with a filter plate, an aluminum inlet, an aluminum outlet, an outlet channel, and a baffle. The aluminum inlet is located on one side of the upper end of the filter box body, and the aluminum outlet is located on the other side. This filter box lining, with its internal filter plate, has a limited aluminum filtration capacity, and the lack of a drain outlet prevents the rapid removal of residual aluminum when replacing the filter plate during casting. Similarly, patent application number CN201821785670 discloses a two-stage plate filter box. However, its two-stage filter box lining uses a modular prefabricated assembly structure, resulting in a complex and costly production process. Furthermore, aluminum seepage is prone to occur at the joints, which can cause aluminum blocks to break through the filter box lining, affecting the filter box's service life. Therefore, existing two-stage filter box lining structures require further improvement. Summary of the Invention

[0004] The purpose of this utility model is to provide a double-stage filter box liner for aluminum and aluminum alloy melt casting, which has the characteristics of compact structure, high product strength, high filtration efficiency and long service life. By installing a single filter box liner of this utility model, a double-stage filtration effect can be achieved, reducing production input costs and saving on-site installation space. It is widely used in the field of aluminum and aluminum alloy melt casting technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a liner for a two-stage filter box for aluminum and aluminum alloy melt casting, comprising a filter box body, the filter box body having a square structure; the filter box body having a primary filtration cavity and a secondary filtration cavity inside, the primary filtration cavity having a first outlet in the middle of its bottom and an aluminum liquid inlet on its upper side; the primary filtration cavity being connected to a first liquid storage cavity through a first connecting channel at its bottom; the first liquid storage cavity being connected to the secondary filtration cavity, the secondary filtration cavity being connected to a second liquid storage cavity through a second connecting channel; the second liquid storage cavity having a second outlet in the middle of its bottom and an aluminum liquid outlet at its upper end.

[0006] As an improvement, the primary and secondary filter cavities are diagonally staggered.

[0007] As an improvement, the primary filtration cavity is provided with a coarse-mesh filter plate, the secondary filtration cavity is provided with a fine-mesh filter plate, and the bottom of the primary filtration cavity and the secondary filtration cavity are inclined with an inclination of 3~5°.

[0008] As an improvement, the coarse-mesh filter plate and the fine-mesh filter plate are 17° angled filter plates, and the pore size of the coarse-mesh filter plate is 18~30ppi, while the pore size of the fine-mesh filter plate is 35~60ppi.

[0009] As an improvement, the first discharge port has a horn-shaped structure with a smaller inner diameter and a larger outer diameter.

[0010] As an improvement, both the aluminum liquid inlet and the aluminum liquid outlet are U-shaped structures and are located at the same height as the filter box body.

[0011] As an improvement, the second discharge port is a circular hole structure of equal diameter and is located at the lowest plane of the second liquid storage cavity.

[0012] As an improvement, the height of the first liquid storage cavity is 1 / 4 to 1 / 3 of the height of the primary filtration cavity, and the height of the second liquid storage cavity is the same as that of the secondary filtration cavity.

[0013] As an improvement, both the first and second connecting channels are square-structured channels, and are located at the center of one side of the primary filter cavity and the secondary filter cavity, respectively.

[0014] As an improvement, the filter box body is made of high-strength castable material, which is integrally cast using a wooden mold. After molding, it is naturally dried for 1-2 days and then sintered at 760℃ for 5-6 days. The specific composition of the castable material is fused silica or silicon carbide.

[0015] As an improvement, the interior of the filter box body is coated with boron nitride.

[0016] The beneficial effects of this utility model are as follows: A double-stage filter box liner for aluminum and aluminum alloy melt casting features a compact structure, high product strength, high filtration efficiency, and long service life. By adopting a staggered double-stage filter cavity structure, with the aluminum melt inlet and outlet located on the same side of the filter box, the overall volume of the filter box is effectively reduced, lowering material costs. The placement of coarse and fine pore filter plates inside the double-stage filter cavities achieves a double-stage filtration effect, enhancing the aluminum melt filtration and purification effect, thereby further improving the physical and chemical properties of the aluminum castings. Two drain ports facilitate the complete discharge of residual aluminum melt inside the filter box, aiding in internal cleaning and filter plate replacement. Finally, the use of high-strength castable material and the creation of a castable mold using wooden molds effectively reduces production costs. Furthermore, the adoption of drying and high-temperature sintering processes gives the filter box higher strength and thermal shock resistance, thus extending the service life of the filter box. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the inner lining structure of the dual-stage filter box for aluminum and aluminum alloy melt casting according to this utility model.

[0018] Figure 2 This is a cross-sectional view of the primary filter cavity in the lining of the dual-stage filter box for aluminum and aluminum alloy melt casting of this utility model.

[0019] Figure 3 This is a cross-sectional view of the secondary filter cavity in the lining of the dual-stage filter box for aluminum and aluminum alloy melt casting of this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the filter plate placed inside the double-stage filter box for aluminum and aluminum alloy melt casting of this utility model.

[0021] In the diagram: 1. Filter box body; 2. Primary filter cavity; 3. Secondary filter cavity; 4. First discharge port; 5. Aluminum liquid inlet; 6. First connecting channel; 7. First liquid storage cavity; 8. Second connecting channel; 9. Second liquid storage cavity; 10. Second discharge port; 11. Aluminum liquid outlet; 12. Coarse mesh filter plate; 13. Fine mesh filter plate. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: Figures 1-3As shown, this utility model discloses a double-stage filter box liner for aluminum and aluminum alloy melt casting, comprising a filter box body 1, which has a square structure; the filter box body 1 is provided with a primary filter cavity 2 and a secondary filter cavity 3 inside; the primary filter cavity 2 has a first discharge port 4 at the bottom center and an aluminum liquid inlet 5 at the upper side; the primary filter cavity 2 is connected to a first liquid storage cavity 7 through a first connecting channel 6 at the bottom; the first liquid storage cavity 7 is connected to the secondary filter cavity 3, and the secondary filter cavity 3 is connected to a second liquid storage cavity 9 through a second connecting channel 8; the second liquid storage cavity 9 has a second discharge port 10 at the bottom center and an aluminum liquid outlet 11 at the upper end.

[0023] Furthermore, the primary filter cavity 2 and the secondary filter cavity 3 are diagonally staggered.

[0024] Furthermore, such as Figure 4 As shown, the primary filtration chamber 2 is equipped with a coarse-mesh filter plate 12, and the secondary filtration chamber 3 is equipped with a fine-mesh filter plate 13. The bottoms of both the primary and secondary filtration chambers are sloped, with an angle of 3-5°, preferably 4°. This sloped structure allows the filtered molten aluminum to flow smoothly into their respective storage chambers, increasing the filtration flow rate. Specifically, the coarse-mesh filter plate 12 and the fine-mesh filter plate 13 are 17° angled filter plates. The pore size of the coarse-mesh filter plate 12 is 18-30 ppi, preferably 22-30 ppi; the pore size of the fine-mesh filter plate 13 is 35-60 ppi, preferably 40-55 ppi, thereby improving the filtration and purification effect of the molten aluminum.

[0025] Furthermore, the first discharge port 4 is a horn structure with a smaller inner diameter and a larger outer diameter. The horn structure is beneficial for increasing the discharge speed and is suitable for blocking the flow with a conical plug sleeve. The second discharge port 10 is a circular hole structure with equal diameter and is located at the lowest plane of the second liquid storage cavity 9, which facilitates the complete discharge of aluminum liquid inside the liquid storage cavity.

[0026] Furthermore, both the aluminum liquid inlet 5 and the aluminum liquid outlet 11 are U-shaped structures and are located at the same height as the filter box body 1. Specifically, both the aluminum liquid inlet 5 and the aluminum liquid outlet 11 are located on one side of the extension direction of the filter box body 1 and on the side close to the first discharge port 4. Specifically, the aluminum liquid outlet 11 is located at the upper center of the second liquid storage cavity 9, which facilitates the connection between the aluminum liquid and the rear flow channel.

[0027] Furthermore, the height of the first liquid storage cavity 7 is 1 / 4 to 1 / 3 of the height of the first-stage filtration cavity 2, thereby facilitating the flow of the aluminum liquid filtered by the first-stage filtration cavity into the second-stage filtration cavity; the second liquid storage cavity 9 has the same height as the second-stage filtration cavity 3, and sufficient aluminum liquid is stored in the second liquid storage cavity 9, which then flows into the rear flow channel as the aluminum liquid level rises to the aluminum liquid outlet 11.

[0028] Furthermore, both the first connecting channel 6 and the second connecting channel 8 are square structure channels, and are located at the center of one side of the primary filter cavity 2 and the secondary filter cavity 3, respectively, thereby improving the aluminum liquid flow rate and making the bottom sides of the filter cavity have high strength to avoid damage when cleaning aluminum dross.

[0029] Furthermore, the filter box body 1 is made of high-strength castable material, integrally cast using a wooden mold, and after molding, it is naturally dried for 1-2 days, and then sintered at 760℃ for 5-6 days. The specific composition of the castable material is fused silica or silicon carbide, which gives the filter box body excellent strength and thermal shock resistance. Specifically, the filter box body 1 is also provided with a boron nitride coating inside, which further prevents aluminum from sticking to the inner wall.

[0030] This utility model discloses a double-stage filter box liner for aluminum and aluminum alloy melt casting, which features a compact structure, high product strength, high filtration efficiency, and long service life; its working principle is as follows: Figure 4 As shown by the arrow, the high-temperature molten aluminum flows out of the holding furnace and into the aluminum inlet 5 connected to it via the flow channel. Then it flows into the primary filtration cavity 2, and after primary filtration by the coarse mesh filter plate 12, it flows into the first liquid storage cavity 7 through the first connecting channel 6 at the bottom of the cavity. Then it flows into the secondary filtration cavity 3 through the first liquid storage cavity 7. After secondary filtration by the fine mesh filter plate 13 set inside the secondary filtration cavity 3, it flows into the second liquid storage cavity 9 through the second connecting channel 8 at the bottom of the cavity. As the molten aluminum slowly rises, it finally flows out through the molten aluminum outlet 11 set at the upper end of the second liquid storage cavity 9 and flows into the rear flow channel connected to it. Finally, it flows to the casting platform, completing the casting process of the aluminum casting.

[0031] This utility model may be summarized in other specific forms that do not depart from the spirit and essential features of this utility model. Therefore, any variations within the meaning and scope equivalent to the claims of this utility model should be considered to be included within the scope of the claims.

Claims

1. A liner for a two-stage filter box used in aluminum and aluminum alloy melt casting, comprising a filter box body (1), wherein the filter box body has a square structure; characterized in that, The filter box body (1) is provided with a primary filtration chamber (2) and a secondary filtration chamber (3). The primary filtration chamber (2) has a first discharge port (4) at the bottom center and an aluminum liquid inlet (5) at the upper side. The primary filtration chamber (2) is connected to a first liquid storage chamber (7) through a first connecting channel (6) at the bottom. The first liquid storage chamber (7) is connected to the secondary filtration chamber (3). The secondary filtration chamber (3) is connected to a second liquid storage chamber (9) through a second connecting channel (8). The second liquid storage chamber (9) has a second discharge port (10) at the bottom center and an aluminum liquid outlet (11) at the upper end.

2. The liner for a dual-stage filter box for aluminum and aluminum alloy melt casting according to claim 1, characterized in that, The primary filter cavity (2) and the secondary filter cavity (3) are diagonally staggered.

3. The liner for a dual-stage filter box for melt casting of aluminum and aluminum alloys according to claim 2, characterized in that, The primary filtration cavity (2) is provided with a coarse-mesh filter plate (12), and the secondary filtration cavity (3) is provided with a fine-mesh filter plate (13). The bottom of the primary filtration cavity (2) and the secondary filtration cavity (3) are inclined, with an inclination of 3 to 5 degrees.

4. The liner for a dual-stage filter box for melt casting of aluminum and aluminum alloys according to claim 3, characterized in that, The coarse-mesh filter plate (12) and the fine-mesh filter plate (13) are 17° angled filter plates, and the pore size of the coarse-mesh filter plate (12) is 18~30ppi, and the pore size of the fine-mesh filter plate (13) is 35~60ppi.

5. The liner for a dual-stage filter box for melt casting of aluminum and aluminum alloys according to claim 1, characterized in that, The first discharge port (4) has a horn structure with a smaller inner diameter and a larger outer diameter.

6. The liner for a dual-stage filter box for melt casting of aluminum and aluminum alloys according to claim 1, characterized in that, The aluminum liquid inlet (5) and aluminum liquid outlet (11) are both U-shaped structures and are located at the same height as the filter box body (1).

7. The liner for a dual-stage filter box for melt casting of aluminum and aluminum alloys according to claim 1, characterized in that, The second discharge port (10) is a circular hole structure of equal diameter and is located at the lowest plane of the second liquid storage cavity (9).

8. The liner of the dual-stage filter box for aluminum and aluminum alloy melt casting according to claim 1, characterized in that, The height of the first liquid storage cavity (7) is 1 / 4 to 1 / 3 of the height of the first-stage filtration cavity (2), and the height of the second liquid storage cavity (9) is the same as that of the second-stage filtration cavity (3).

9. The liner for a dual-stage filter box for melt casting of aluminum and aluminum alloys according to claim 1, characterized in that, The first connecting channel (6) and the second connecting channel (8) are both square structure channels, and are located at the center of one side of the primary filter cavity (2) and the secondary filter cavity (3), respectively.

10. The liner for a dual-stage filter box for melt casting of aluminum and aluminum alloys according to claim 1, characterized in that, The filter box body (1) is made of high-strength castable material, which is integrally cast by wooden mold. After molding, it is naturally dried for 1-2 days and then sintered at 760℃ for 5-6 days. The specific composition of the castable material is fused silica or silicon carbide.

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