Rotary distributor oxide skin removing device and aluminum ingot casting system

Abstract

The invention relates to the technical field of molten aluminum treatment, and provides a rotary distributor oxide skin removing device and an aluminum ingot casting system, and the device comprises a rotary distributor, a purging unit, an oxide skin collecting air duct and a filter screen. Molten aluminum enters the rotary distributor through the molten aluminum launder, is filtered by the filter screen and then continuously flows out from the discharge ports which are uniformly distributed in the circumferential direction. The blowing unit is fixed above the rotary distributor, a first blowing pipe blows downwards in an inclined manner at an angle of 30-60 degrees, and oxide skin attached to a cylinder wall is turned over and guided to the direction of a discharge port; and the second air blowing pipe vertically downwards blows the oxide skin into the corresponding discharging opening accurately. And the oxide skin falls into an oxide skin collecting air duct positioned in the roller, and is discharged out of the machine through a transverse outlet after being collected. The device is compact in structure and high in removing efficiency, oxide skin can be removed on line under the condition that casting is not interrupted, and slag included in aluminum ingots is reduced.

Description

Technical Field

[0001] This invention relates to the field of aluminum liquid treatment technology, and in particular to a rotary distributor oxide scale removal device and an aluminum ingot casting system. Background Technology

[0002] In the field of aluminum ingot casting, molten aluminum easily comes into contact with air during the casting process to form oxide scale (also known as slag). This oxide scale is washed into the mold and forms oxide inclusions inside the aluminum alloy ingot. Existing technologies generally use inert gas protection methods to suppress oxidation. For example, patent CN202410187517X proposes an aluminum ingot casting system that reuses online degassing waste gas: by setting a heat-insulating cover on the top of the degassing trough to form a sealed cavity, the inert waste gas generated by online degassing is guided to the front end of the distributor to form a local inert atmosphere to reduce the oxidation of aluminum molten metal in the mold.

[0003] However, this approach has the following limitations: 1. Inability to remove oxide scale from the rotary distributor itself: Inert gas protection only applies to the mold area, while as molten aluminum flows through the rotary distributor (i.e., the hollow roller), oxide scale continues to form on its outer wall outlet due to aluminum splashing and contact with air. This oxide scale adheres to the edge of the outlet and easily falls off as the distributor rotates, mixing into the aluminum ingot and causing surface defects in the product.

[0004] 2. Insufficient exhaust gas coverage: The exhaust device only covers the front of the distributor and the mold chain, and cannot effectively reach the discharge port on the outer wall of the distributor, resulting in the inability to solve the problem of oxide scale accumulation in the discharge port area.

[0005] 3. Inherent defects of passive protection: This solution relies on the diffusion of exhaust gas to form an inert atmosphere, but the airflow is turbulent when the distributor rotates at high speed, resulting in limited actual protection effect; and it cannot actively remove the oxide scale that has been formed.

[0006] Therefore, there is an urgent need for an oxide scale removal device for the rotary distributor body to directly remove oxide scale residue at the outlet during the casting process, thereby fundamentally reducing inclusions inside the aluminum ingot. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rotary distributor oxide scale removal device and an aluminum ingot casting system. By optimizing the design of the purging unit, the structure of the aluminum liquid flow channel, and the design of the oxide scale collection duct, the oxide scale removal efficiency and the quality of the aluminum liquid are improved.

[0008] The technical solution adopted by this invention to solve the technical problem is: This invention provides a rotary distributor oxide scale removal device, including a rotary distributor, which is a hollow drum with a first cylinder opening and a second cylinder opening in the axial direction. The outlet of the aluminum liquid flow channel extends into the first cylinder opening. Multiple discharge ports are radially uniformly formed on the outer wall of the rotary distributor. It also includes a purging unit and an oxide scale collection air duct. The purging unit is fixed above the rotary distributor and includes: The first air blowing pipe has its air outlet set at a 30-60 degree angle downwards, which flips the oxide scale at a certain angle, turning it from the direction away from the outlet to the direction facing the outlet. The second air pipe points vertically downwards toward the center of the discharge port, blowing the oxide scale that has been flipped over by the first air pipe into the discharge port; The oxide scale collection duct is installed inside the drum of the rotary distributor. The oxide scale collection duct has an oxide scale inlet and an oxide scale outlet. The oxide scale inlet is set vertically with its opening facing upwards and is located directly below the second air blowing pipe. The oxide scale outlet is set horizontally and extends out from the second cylinder opening of the rotary distributor.

[0009] Furthermore, it also includes a filter screen, which is detachably installed inside the hollow drum. The molten aluminum flowing out of the aluminum trough is filtered by the filter screen and then flows out sequentially from each trough.

[0010] Furthermore, the first air tube makes an angle of 45 degrees with the horizontal plane.

[0011] Furthermore, the oxide scale inlet of the oxide scale collection duct has a funnel-shaped flared structure.

[0012] Furthermore, it also includes a pressure regulating valve connected to the air supply line of the purging unit, used to adjust the purging air pressure according to the rotation speed of the rotary distributor.

[0013] Furthermore, the purging unit is fixed by an adjustable bracket, which can be moved to accommodate rotary dispensers of different diameters.

[0014] The present invention also provides an aluminum ingot casting system, including the aforementioned rotary distributor oxide scale removal device.

[0015] The advantages and positive effects of this invention are: 1. This invention uses a first air blowing pipe to obliquely blow at a 30-60° angle, flipping the oxide scale attached to the edge of the discharge port to face the center of the discharge port; combined with a second air blowing pipe to vertically blow downwards, the oxide scale is directly blown into the internal channel of the discharge port. This proactively removes residual oxide scale from the outer wall of the rotary distributor at the source, preventing it from mixing into the molten aluminum and causing internal defects in the aluminum ingot, thus reducing inclusions inside the aluminum ingot.

[0016] 2. The blowing unit of this invention is fixed above the rotary distributor, directly targeting the dynamically rotating discharge port for precise blowing; the oxide scale collection duct is integrated inside the drum, receiving the blown-in oxide scale through a vertical inlet and discharging it through a horizontal outlet. This overcomes the technical bottleneck of oxide scale removal from rotating components, achieving continuous cleaning under dynamic operation and filling a gap in existing technology.

[0017] 3. The oxide scale collection duct of this invention is independent of the gas supply system, directly and physically collecting and removing oxide scale; the purging unit only requires a compressed air source, without the need to modify existing degassing or casting processes. This simplifies equipment integration, avoids oxide scale circulation and contamination within the system, and is compatible with existing production lines.

[0018] 4. The two-stage purging of this invention forms a synergistic effect, solving the technical problem that oxide scale is difficult to remove due to surface tension, and improving the removal efficiency by more than 99%.

[0019] 5. The purging unit of this invention works synchronously with the rotary distributor, completing oxide scale removal while the aluminum molten metal is being poured; the lateral outlet of the collecting air duct extends from the second opening of the drum to avoid interfering with the flow of the aluminum molten metal. This achieves integrated "casting-removal" without requiring machine shutdown for cleaning, ensuring continuous and efficient operation of the production line. Attached Figure Description

[0020] Figure 1 This is the front view of the device; Figure 2 This is a side view of the device.

[0021] 100 Rotary distributor; 101 Discharge port; 201 First air blowing pipe; 202 Second air blowing pipe; 300 Oxide scale collection duct; 400 Aluminum liquid flow channel; 500 Filter screen; 600 Ingot mold. Detailed Implementation

[0022] To make the technical solution and advantages of the present invention clearer, the rotary distributor oxide scale removal device of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be emphasized that the described embodiments are for illustrative purposes only and do not constitute a limitation on the scope of protection of the present invention. Those skilled in the art can make various modifications and substitutions to the embodiments without departing from the concept of the present invention.

[0023] Example 1: like Figure 1 and Figure 2 As shown, this embodiment provides a scale removal device for a standard-sized rotary distributor, including a rotary distributor 100, a purging unit, and a scale collection duct 300.

[0024] Rotary distributor 100: As a core component, this embodiment uses a hollow drum with an outer diameter of 490mm and a length of 410mm. Twelve discharge ports 101 are evenly distributed radially on the outer wall of the drum, each with a diameter of 24-34mm. One end of the drum is connected to an aluminum molten metal flow channel 400 to receive molten aluminum from the flow channel 400.

[0025] In a preferred embodiment, an anti-stick aluminum coating is sprayed onto the inner wall of the aluminum liquid distributor 100 and the inner and outer walls of the aluminum liquid flow channel 400, which serves to insulate the heat and prevent aluminum from sticking.

[0026] The purging unit is fixedly installed above the rotary distributor 100, precisely aligned with the discharge port 101 to perform the purging operation, and includes: The first air blowing pipe 201 is made of high-temperature resistant stainless steel. Its air outlet is designed at a 45° angle to the horizontal plane, approximately 80mm from the edge of the discharge port 101. During operation, an air pressure of 0.4MPa is applied, and the resulting high-pressure inclined airflow impacts the oxide scale adhering to the edge of the discharge port 101, causing it to peel off the adhering surface and flip towards the center of the discharge port. This precise angle control ensures the directional movement of the oxide scale.

[0027] The second air blowing pipe 202, also made of stainless steel, is vertically installed 50mm behind the first air blowing pipe 201, directly opposite the center of the discharge port 101. Applying 0.5MPa air pressure generates a vertically downward high-pressure airflow, precisely blowing the oxide scale, after being flipped by the first air blowing pipe, into the inlet of the oxide scale collection duct 300 below.

[0028] In a preferred embodiment, a pressure regulating valve is also included, connected to the air supply line of the purging unit, for adjusting the purging air pressure according to the rotational speed of the rotary distributor 100.

[0029] In a preferred embodiment, the purging unit is fixed by an adjustable bracket, which is movable to accommodate rotary dispensers of different diameters.

[0030] Oxide scale collection duct 300: Integrated inside the drum of the rotary distributor 100, used to collect the blown-off oxide scale. Oxide scale inlet: Ensures effective collection of oxide scale blown off by the second air pipe 202, reducing overflow.

[0031] Oxide scale outlet: extends from the second cylinder opening of the rotary distributor 100, facilitating connection to an external collection device.

[0032] In a preferred embodiment, the oxide scale inlet of the oxide scale collecting duct 300 is a funnel-shaped flared structure.

[0033] The working principle of this device is as follows: Molten aluminum flows from the aluminum flow channel 400 into the rotary distributor 100 and flows out through the outlet 101 for casting. During the process, the molten aluminum near the outlet 101 comes into contact with air and forms an oxide scale.

[0034] Purging process: The purging unit remains operational while the rotary distributor 100 rotates. The first air pipe 201 and the second air pipe 202 work together: the inclined airflow peels off and flips the oxide scale; the vertical airflow precisely blows it into the inlet of the oxide scale collection duct 300.

[0035] Collection process: Oxide scale falling into the oxide scale collection duct 300 is discharged and transported to the dust collection box for treatment.

[0036] Example 2: Filter-type rotary distributor oxide scale removal device This embodiment adds a filtering function based on embodiment 1: Filter screen 500: A removable filter screen 500 is installed inside the hollow drum of the rotary distributor 100. Molten aluminum from the aluminum flow channel 400 first passes through the filter screen 500 to remove larger impurities and particles before flowing out through the outlet 101. The filter screen can be made of fiber with different pore sizes, selected according to the purity of the molten aluminum and the requirements of the ingot casting. The removable design facilitates regular cleaning or replacement based on the impurity content of the molten aluminum and the production batch, ensuring filtration effectiveness. A mesh size of 14-16 is preferred for the filter screen.

[0037] The detailed description of the embodiments above is intended to help understand the principles and applications of the present invention and should not be considered as a limitation thereof. Those skilled in the art can modify or adjust the above embodiments according to actual needs, and such modifications or adjustments should all be covered within the protection scope of the present invention.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept, and these all fall within the protection scope of the present invention.

Claims

1. A rotary distributor oxide scale removal device, comprising a rotary distributor (100), wherein the rotary distributor (100) is a hollow drum, having a first cylinder opening and a second cylinder opening in the axial direction, the outlet of an aluminum liquid flow channel (400) extending into the first cylinder opening, and a plurality of discharge ports (101) are radially uniformly formed on the outer wall of the rotary distributor (100). Its features are, It also includes a purging unit and an oxide scale collection duct (300); The purging unit is fixed above the rotary distributor (100) and includes: The first air blowing pipe (201) has its air outlet set at an angle of 30-60 degrees downwards, which flips the oxide scale at a certain angle from the direction away from the discharge port (101) to the direction facing the discharge port (101). The second air blowing pipe (202) points vertically downwards toward the center of the discharge port (101) and blows the oxide scale that has been turned over by the first air blowing pipe (201) into the discharge port (101); The scale collection duct (300) is installed inside the drum of the rotary distributor (100). The scale collection duct (300) has a scale inlet and a scale outlet. The scale inlet is vertically arranged with its opening facing upwards and located directly below the second air blowing pipe (202). The scale outlet is horizontally arranged and extends out from the second cylinder opening of the rotary distributor (100).

2. The rotary distributor oxide scale removal device according to claim 1, characterized in that, It also includes a filter screen (500), which is detachably installed inside the hollow drum. The aluminum liquid flowing out from the aluminum liquid flow channel (400) is filtered by the filter screen (500) and then flows out sequentially from each (101).

3. The rotary distributor oxide scale removal device according to claim 1, characterized in that, The first air blowing pipe (201) has an angle of 45 degrees with the horizontal plane.

4. The rotary distributor oxide scale removal device according to claim 1, characterized in that, The oxide scale inlet of the oxide scale collection duct (300) is a funnel-shaped flared structure.

5. The rotary distributor oxide scale removal device according to claim 1, characterized in that, It also includes a pressure regulating valve connected to the air supply line of the purging unit, used to adjust the purging air pressure according to the rotation speed of the rotary distributor (100).

6. The rotary distributor oxide scale removal device according to claim 1, characterized in that, The purging unit is fixed by an adjustable bracket, which is movable to accommodate rotary dispensers of different diameters.

7. An aluminum ingot casting system, characterized in that, The rotary distributor oxide scale removal device includes any one of claims 1-6.

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