Molten aluminum refining degassing pipe

Abstract

The utility model provides a molten aluminum refining degassing pipe. The molten aluminum refining degassing pipe comprises an upper pipe, a lower pipe and a connecting part, the upper end of the lower pipe sleeves the outer side of the upper pipe and is in sliding fit with the outer side surface of the upper pipe; a through hole is formed close to the lower end of the lower pipe; the connecting part comprises a fixed box and a moving part, the fixed box is fixed to the outer side of the upper pipe, an iron sheet is arranged on the upper side face of the fixed box, the moving part is fixed to the outer side wall of the upper end of the lower pipe, and a magnet is arranged on the moving part; the moving part is arranged in the fixed box. According to the utility model, the blowing range is expanded, the uniformity is ensured, and the degassing effect is better. It is ensured that the distance between the through hole and the furnace bottom is 10-15 cm, it is ensured that the blowing position is standard, the blowing precision is improved, and the molten aluminum refining degassing effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy refining technology, and in particular to a degassing pipe for aluminum liquid refining. Background Technology

[0002] In the aluminum alloy refining process, an inert gas, such as nitrogen, is introduced into the molten aluminum through a blowing pipe. This carries away the gas in the molten aluminum and forms floating bubbles. These bubbles adsorb non-metallic inclusions, such as oxide inclusions, in the molten aluminum and bring them to the surface to form scum, thus obtaining refined pure aluminum liquid.

[0003] However, the degassing pipes in the existing technology are often ordinary straight pipes. On the one hand, the outlet of the straight pipe is only at one end of the pipe body. When the air is sprayed into the aluminum liquid, the range is limited and the air is concentrated from the bottom, resulting in poor uniformity and poor degassing effect. Furthermore, during degassing, the outlet of the degassing pipe needs to be 10-15cm away from the bottom of the furnace. It is difficult to determine the insertion depth of the existing degassing pipe after it is inserted into the aluminum liquid. Summary of the Invention

[0004] To address the above problems, this utility model provides a degassing pipe for aluminum liquid refining.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A degassing pipe for refining molten aluminum includes an upper pipe, a lower pipe, and a connecting part;

[0007] The upper end of the lower tube is sleeved on the outside of the upper tube and slides in cooperation with the outer surface of the upper tube; a through hole is provided near the lower end of the lower tube;

[0008] The connecting part includes a fixed box and a movable component. The fixed box is fixed to the outside of the upper tube, and an iron plate is provided on the upper side of the fixed box. The movable component is fixed to the outer side wall of the upper end of the lower tube, and a magnet is provided on the movable component. The movable component is located inside the fixed box.

[0009] Furthermore, the through hole is 8-13 cm away from the lower end of the lower tube.

[0010] Furthermore, the lower end of the lower tube is spherical, and a branch tube is connected to the lower end. The branch tube is an L-shaped tube, with one end of the branch tube connected to the spherical inner cavity of the lower end, and the other end of the branch tube facing upward. A through hole is provided on the end face of the upward-facing end of the branch tube.

[0011] Furthermore, the through hole includes a straight section and an enlarged section. The diameter of the straight section is smaller than the inner diameter of the branch pipe. One end of the enlarged section is connected to the straight section, and the other end of the enlarged section is connected to the inner cavity of the branch pipe. The diameter of the enlarged section gradually increases from the connection point with the straight section until it is the same as the inner diameter of the branch pipe.

[0012] Furthermore, there are at least two branch pipes, which are equidistantly arranged around the circumference of a horizontal circle passing through the spherical dot.

[0013] Furthermore, the lower end of the lower tube is provided with an end hole, the diameter of which is smaller than the inner diameter of the upper tube.

[0014] Furthermore, the fixing box includes a box body and a box cover. The box body includes a base plate and a short tube. The base plate is concentrically fixed to the outside of the upper tube. An iron sheet is embedded in the base plate. The iron sheet is annular. One end of the short tube is connected to the base plate. The short tube is concentrically arranged with the base plate. The other end of the short tube faces the lower tube. The outer side of the other end of the short tube is provided with a first thread. The box cover includes a cover plate and a cover wall. The cover plate is provided with a round hole. The round hole is concentrically arranged with the cover plate. The inner side of the cover wall is provided with a corresponding second thread.

[0015] Furthermore, the movable component is made of iron and is annular. A circular groove is provided on the upper surface of the movable component, and a mounting hole is provided within the circular groove. The mounting hole is concentric with the circular groove and is interference-fitted with the outer surface of the upper end of the lower tube. A magnet is attracted by magnetic force within the circular groove. The magnet is annular, and its inner diameter is larger than the outer diameter of the lower tube. The diameter of the circular hole is larger than the outer diameter of the lower tube but smaller than the outer diameter of the movable component.

[0016] Furthermore, the upper end face of the magnet is flush with the upper end face of the movable component, and the upper end face of the movable component is also provided with an annular groove. The annular groove is concentric with the circular groove. The inner diameter of the annular groove is larger than the diameter of the circular groove. A sealing ring is provided in the annular groove, and the upper part of the sealing ring protrudes from the upper end face of the movable component.

[0017] Furthermore, the lower tube is a graphite tube.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) By setting the through hole on the side wall of the pipe, this utility model ensures that when blowing air into the molten aluminum, it can be discharged from multiple directions of the lower pipe, expand the blowing range, ensure uniformity, and achieve better degassing effect. An end hole is also set at the lower end to ensure that the lower end can also blow air into the molten aluminum, expand the blowing range, improve the degassing effect, and avoid the bottom being unable to degas. (2) This utility model is equipped with a connecting part. When in use, the lower pipe is placed into the molten aluminum until it contacts the bottom of the furnace. The lower pipe moves upward against the magnetic attraction and drives the lower pipe to move upward to fit the inner top of the fixing box, so that the lower end of the lower pipe is a certain distance away from the bottom of the furnace, avoiding the lower end of the lower pipe from touching the bottom of the furnace and hindering the movement of the lower pipe, ensuring the normal degassing. When the attraction is in contact, it ensures that the through hole is 10-15cm away from the bottom of the furnace, ensuring the blowing position is standardized, improving the blowing accuracy, and ensuring the degassing effect of molten aluminum refining. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an aluminum liquid refining degassing pipe according to Embodiment 1 of this utility model;

[0020] Figure 2 This is a three-dimensional structural diagram of a fixing box for a degassing pipe in aluminum liquid refining according to the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of a movable component of an aluminum liquid refining degassing pipe according to the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of a degassing pipe for aluminum liquid refining according to Embodiment 2 of this utility model. Detailed Implementation

[0023] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments. Example 1

[0024] Please refer to the reference. Figure 1 , Figure 2 , Figure 3 An embodiment of the present invention provides an aluminum liquid refining degassing pipe, comprising an upper pipe 100, a lower pipe 200, and a connecting part 300.

[0025] The upper end of the lower tube 200 is sleeved on the outside of the upper tube 100 and slides in cooperation with the outer surface of the upper tube 100; the outer diameter of the upper tube 100 is smaller than the inner diameter of the lower tube 200. A through hole 210 is provided near the lower end of the lower tube 200; several through holes 210 are provided. By setting the through holes 210 on the side wall of the pipe, it is ensured that when air is blown into the molten aluminum, it can be discharged from multiple directions of the lower tube, thereby expanding the blowing range, ensuring uniformity, and achieving better degassing effect.

[0026] The connecting part 300 includes a fixing box 310 and a movable part 320. The fixing box 310 is fixed to the outside of the upper tube 100, and an iron plate 330 is provided on the upper side of the fixing box 310. The movable part 320 is fixed to the outer side wall of the upper end of the lower tube 200, and a magnet 400 is provided on the movable part 320. The movable part 320 is located inside the fixing box 310. There is a certain distance between the magnet 400 and the iron plate 330, which is 2-5 cm, and this distance exceeds the distance at which the magnet 400 attracts the iron plate 330. During use, the upper tube 100 is always above the molten aluminum. The lower tube 200 is placed into the molten aluminum until it contacts the bottom of the furnace. The lower tube moves upward against the furnace bottom until the distance between the magnet 400 and the iron plate 330 is less than the attraction distance. The magnet 400 is attracted and moves the lower tube 200 upward to fit against the inner top of the fixing box 310. This ensures that the lower end of the lower tube 200 is a certain distance from the bottom of the furnace, allowing the lower tube 200 to move during degassing and enabling normal degassing.

[0027] The through hole 210 is 8-13cm away from the lower end of the lower tube 200. This ensures that when the magnet 400 and the iron sheet 330 are attracted and attached, the distance between the through hole 210 and the furnace bottom is 10-15cm, thus ensuring the proper blowing position, improving the blowing accuracy, and guaranteeing the degassing effect of aluminum liquid refining.

[0028] The lower end of the lower tube 200 is arc-shaped, and the lower end of the lower tube 200 is also provided with an end hole 220. The diameter of the end hole 220 is smaller than the inner diameter of the upper tube 100. This ensures that air can also be blown into the molten aluminum from the lower end, expanding the blowing range, improving the degassing effect, and avoiding the bottom being unable to degas.

[0029] The fixing box 310 includes a box body 311 and a box cover 312. The box body 311 includes a base plate 313 and a short tube 314. The base plate 313 is concentrically fixed to the outside of the upper tube 100, making the fixing box 300 and the upper tube 100 an integral unit. The upper tube 100 and the fixing box 300 are made of non-ferrous material to prevent the magnet from being attracted to any position other than the iron sheet 330. The iron sheet 330 is embedded in the base plate 313. The iron sheet 330 can be embedded in the base plate 313 during its preparation, or the base plate 313 has a groove on the side facing the moving part 320, into which the iron sheet 330 is placed and fixed with adhesive, thus fixing the iron sheet 330 to the base plate 313. The connection is firm and not easy to fall off, ensuring that when the magnet is attracted, the position of the iron sheet 330 remains unchanged, driving the moving part 320 to move upward. The iron sheet 330 is annular. One end of the short tube 314 is connected to the base plate 313, and the short tube 314 is concentrically arranged with the base plate 313. The other end of the short tube 314 faces the lower tube 200. The outer surface of the other end of the short tube 314 is provided with a first thread 315. The box cover 312 includes a cover plate 316 and a cover wall 317. The cover plate 316 is provided with a circular hole 318, which is concentrically arranged with the cover plate 316. The inner surface of the cover wall 317 is provided with a corresponding second thread 319. The box body 311 and the box cover 312 are detachably connected by threads, which facilitates the replacement of lower tubes 200 of different lengths for use, meeting the needs of smelting furnaces of different depths. The length of the lower tube is 0.5m-2m, which can meet the needs of most depths of molten aluminum. It also facilitates the replacement of damaged parts and reduces resource waste.

[0030] The movable component 320 is made of iron and is annular. Its upper surface has a circular groove 321 with a mounting hole 322 inside. The mounting hole 322 is concentric with the groove and is press-fitted to the outer surface of the upper end of the lower tube 200, ensuring a secure connection between the movable component 320 and the lower tube 200 and preventing it from falling off. The circular groove 321 magnetically attracts the magnet 400. The magnet 400 is annular, with its inner diameter larger than the outer diameter of the lower tube 200, but its outer diameter not exceeding the diameter of the circular groove 321. This ensures the magnet 400 can be placed into and fixed within the groove 321, guaranteeing a secure fixation. The diameter of the circular hole 318 is larger than the outer diameter of the lower tube 200 but smaller than the outer diameter of the movable component 320. This ensures that the lower tube 200 can slide up and down on the outer surface of the upper tube 100 through the round hole 318, and also prevents the moving part 320 from falling out of the fixed box 310, thus preventing the lower tube 200 from falling into the molten aluminum.

[0031] The upper surface of the magnet 400 is flush with the upper surface of the movable component 320. The upper surface of the movable component 320 is also provided with an annular groove 323, which is concentrically arranged with the circular groove 321. The inner diameter of the annular groove 323 is larger than the diameter of the circular groove 321. A sealing ring 324 is provided within the annular groove 323, with the upper part of the sealing ring 324 protruding 0-5 mm from the upper surface of the movable component 320. This ensures that when the iron sheet and the magnet are attracted and adhered, the sealing ring 324 can deform to seal the movable component 320 and the fixing box 310, preventing air leakage at the connection.

[0032] The lower tube 200 is a graphite tube. It has strong heat resistance, is not easily melted, has a long service life, does not react with molten aluminum, and avoids introducing other impurities into the molten aluminum. Example 2

[0033] like Figure 4 The other structures are the same as in Embodiment 1, except that the lower end of the lower tube 200 is spherical, increasing its volume and facilitating the connection of more branch tubes 500. The lower end 200 is connected to branch tubes 500, which are L-shaped. One end of the branch tube 500 is connected to the spherical inner cavity of the lower end, and the other end of the branch tube 500 faces upwards. A through hole 210 is provided on the end face of the upward-facing end of the branch tube 500. This expands the range of air blowing into the molten aluminum during use, ensuring uniform air blowing. Simultaneously, the multi-branch tube 500 structure agitates the molten aluminum as the lower tube 200 moves within it, increasing its fluidity and ensuring more uniform mixing of gas and molten aluminum, thus improving the degassing effect.

[0034] The through-hole 210 includes a straight section 211 and an enlarged section 212. The diameter of the straight section 211 is smaller than the inner diameter of the branch pipe 500. One end of the enlarged section 212 is connected to the straight section 211, and the other end is connected to the inner cavity of the branch pipe 500. The diameter of the enlarged section 212 gradually increases from its connection with the straight section 211 until it is the same as the inner diameter of the branch pipe 500. This reduces the resistance to gas flow within the branch pipe 500. Simultaneously, the gas is ultimately discharged through the smaller straight section 211. The gas discharged through the straight section 211 has a high velocity, enters the molten aluminum, has a longer gas path, and a wider diffusion range, ensuring a degassing effect. At the same time, it also prevents molten aluminum from entering the lower pipe 200 through the through-hole.

[0035] There are at least two branch pipes 500, which are equidistantly arranged around the circumference of a horizontal circle passing through the center of the sphere. This point represents the maximum circumference of the sphere, ensuring that a larger number of branch pipes 500 can be fixed, thus expanding the blowing range and improving the degassing effect.

[0036] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A degassing pipe for aluminum liquid refining, characterized in that: Includes the upper pipe, lower pipe, and connecting parts; The upper end of the lower tube is sleeved on the outside of the upper tube and slides in cooperation with the outer surface of the upper tube; a through hole is provided near the lower end of the lower tube; The connecting part includes a fixed box and a movable component. The fixed box is fixed to the outside of the upper tube, and an iron plate is provided on the upper side of the fixed box. The movable component is fixed to the outer side wall of the upper end of the lower tube, and a magnet is provided on the movable component. The movable component is located inside the fixed box.

2. The aluminum liquid refining degassing pipe as described in claim 1, characterized in that: The through hole is 8-13 cm from the lower end of the lower tube.

3. The aluminum liquid refining degassing pipe as described in claim 1, characterized in that: The lower end of the lower tube is spherical, and a branch tube is connected to the lower end. The branch tube is an L-shaped tube, with one end of the branch tube connected to the inner cavity of the spherical lower end, and the other end of the branch tube facing upward. A through hole is provided on the end face of the upward-facing end of the branch tube.

4. The aluminum liquid refining degassing pipe as described in claim 3, characterized in that: The through hole includes a straight section and an enlarged section. The diameter of the straight section is smaller than the inner diameter of the branch pipe. One end of the enlarged section is connected to the straight section, and the other end of the enlarged section is connected to the inner cavity of the branch pipe. The diameter of the enlarged section gradually increases from the connection with the straight section until it is the same as the inner diameter of the branch pipe.

5. The aluminum liquid refining degassing pipe as described in claim 3, characterized in that: There are at least two branch pipes, which are equidistantly arranged around the circumference of a horizontal circle passing through the spherical dot.

6. The aluminum liquid refining degassing pipe as described in claim 1, characterized in that: The lower end of the lower tube is also provided with an end hole, the diameter of which is smaller than the inner diameter of the upper tube.

7. The aluminum liquid refining degassing pipe as described in claim 1, characterized in that: The fixing box includes a box body and a box cover. The box body includes a base plate and a short tube. The base plate is concentrically fixed to the outside of the upper tube. An iron sheet is embedded in the base plate. The iron sheet is annular. One end of the short tube is connected to the base plate. The short tube is concentrically arranged with the base plate. The other end of the short tube faces the lower tube. The outer side of the other end of the short tube is provided with a first thread. The box cover includes a cover plate and a cover wall. The cover plate is provided with a round hole. The round hole is concentrically arranged with the cover plate. The inner side of the cover wall is provided with a corresponding second thread.

8. The aluminum liquid refining degassing pipe as described in claim 7, characterized in that: The moving part is made of iron and is ring-shaped. The upper end face of the moving part is provided with a circular groove, and a mounting hole is provided in the circular groove. The mounting hole is concentric with the circular groove and is interference-fitted with the outer surface of the upper end of the lower tube. The magnetic force in the circular groove attracts the magnet. The magnet is ring-shaped and its inner diameter is larger than the outer diameter of the lower tube. The diameter of the circular hole is larger than the outer diameter of the lower tube and smaller than the outer diameter of the moving part.

9. The aluminum liquid refining degassing pipe as described in claim 8, characterized in that: The upper end face of the magnet is flush with the upper end face of the movable part. The upper end face of the movable part is also provided with an annular groove. The annular groove is concentric with the circular groove. The inner diameter of the annular groove is larger than the diameter of the circular groove. A sealing ring is provided in the annular groove. The upper part of the sealing ring protrudes from the upper end face of the movable part.

10. The aluminum liquid refining degassing pipe as described in claim 1, characterized in that: The lower tube is a graphite tube.

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