Degassing device for aluminum alloy casting

Abstract

The utility model discloses a degassing device of aluminum alloy casting, including breather pipe, gas dispersing subassembly, nozzle and rotatory subassembly, breather pipe is provided on the side face of degassing cylinder through lifting subassembly, and the breather pipe passes through and is installed on placing rack in sliding, the gas dispersing subassembly is provided on breather pipe, is used for evenly dispersing inert gas into degassing cylinder, and the nozzle is fixed on the degassing cylinder. The plurality of nozzles are arranged on the gas dispersing assembly, and the rotating assembly is arranged on the lifting assembly and used for driving the gas dispersing assembly to rotate, so that the introduced inert gas becomes fine and is uniformly dispersed. According to the degassing device for the aluminum alloy casting, the problem that inert gas is difficult to uniformly mix and react with liquid aluminum due to the fact that the inert gas filling position is fixed in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of degassing devices, specifically to a degassing device for aluminum alloy castings. Background Technology

[0002] During the smelting and subsequent casting processes, aluminum alloys easily absorb gases such as hydrogen and oxygen. When the casting is solidified, the gases dissolved in the liquid aluminum alloy will precipitate out from the liquid and form pores. The presence of pores will disrupt the continuity and density of the casting. Therefore, degassing treatment can effectively reduce the gas content and prevent the formation of pores.

[0003] When degassing liquid aluminum alloy, inert gas is usually introduced into the liquid aluminum alloy. These inert gases are dispersed in the liquid aluminum alloy in the form of tiny bubbles. Because the partial pressure of the gas inside the bubbles is very low, harmful substances such as hydrogen in the liquid aluminum alloy will continuously diffuse into the bubbles. As the bubbles rise to the surface of the liquid and escape, the degassing purpose is achieved.

[0004] However, existing degassing devices typically place the nozzle at the top of the degassing cylinder and ventilate by moving the nozzle into the liquid aluminum. As a result, the position of the inert gas is fixed, making it difficult to ensure that the gas is evenly distributed after entering the liquid aluminum, leading to poor degassing effect. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a degassing device for aluminum alloy castings, thereby solving the problem mentioned in the background art where the position of the inert gas introduced is fixed, making it difficult to uniformly mix and react with liquid aluminum.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A degassing device for aluminum alloy castings includes a degassing cylinder, a vent pipe, a gas dispersion assembly, nozzles, and a rotating assembly. The vent pipe is disposed on the side of the degassing cylinder via a lifting assembly. The gas dispersion assembly is disposed on the vent pipe and is used to evenly disperse inert gas into the degassing cylinder. Several nozzles are disposed on the gas dispersion assembly. The rotating assembly is disposed on the lifting assembly and is used to drive the gas dispersion assembly to rotate, thereby making the introduced inert gas fine and evenly distributed.

[0010] Furthermore, the lifting assembly includes a mounting frame, a reciprocating screw, a first motor, a connecting frame, a support ring, and a support frame. The mounting frame is fixedly installed on the side of the degassing cylinder. The reciprocating screw is rotatably installed on the mounting frame, and a matching screw nut is provided on the reciprocating screw. The first motor is installed at the bottom end of the mounting frame, and the output end of the first motor is coaxially connected to the reciprocating screw. Connecting frames are fixedly installed on both sides of the screw nut. The support ring is fixedly installed between the two connecting frames, and the vent pipe is fixedly installed through the support ring. The support frame is fixedly installed on the sides of the two connecting frames.

[0011] Furthermore, the air dispersion assembly includes a fixed plate, a rotating pipe, and an air dispersion circular pipe. The fixed plate is fixedly installed on the side of the support frame. The rotating pipe is rotatably installed through the bottom end of the air pipe and is also rotatably installed through the fixed plate. The air dispersion circular pipe is connected to the bottom end of the rotating pipe via a connecting pipe, and both the bottom ends of the connecting pipe and the air dispersion circular pipe are connected to a nozzle.

[0012] Furthermore, the rotating assembly includes a second motor, a drive gear, a drive gear ring, and a protective cover. The second motor is fixedly mounted on the bottom end of the support frame via a mounting plate. The drive gear is fixedly connected to the output end of the second motor. The drive gear ring is fixedly mounted on the rotating tube and meshes with the drive gear. The protective cover is detachably mounted on the fixed plate, and both the drive gear and the drive gear ring are located inside the protective cover.

[0013] To ensure that the inert gas and liquid aluminum are fully mixed, two connecting rings are fixedly installed on the connecting pipe, and a stirring rod is detachably installed at the bottom end of the connecting rings.

[0014] In order to enable the lead screw nut to move up and down on the screw, the mounting bracket is further provided with a sliding groove on its side, and the lead screw nut is slidably mounted in the sliding groove by a slider.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a degassing device for aluminum alloy castings, which has the following beneficial effects:

[0017] 1. In this utility model, when inert gas is introduced, the lifting component drives the ventilation pipe and the gas dispersing group to move downward, so that the nozzle enters the liquid aluminum. The gas dispersing component allows the inert gas to be introduced into the degassing cylinder from multiple directions, so that the inert gas can fully contact the liquid aluminum in the degassing cylinder.

[0018] 2. In this utility model, the rotating component can drive the nozzle to rotate, so that the inert gas can be sprayed out in fine particles, allowing it to better contact the liquid aluminum. Furthermore, the rotation can drive the stirring rod to stir, thereby achieving simultaneous stirring and gas flow.

[0019] Therefore, the degassing device of this aluminum alloy casting, through the cooperation between the vent pipe, the gas dispersion component, the nozzle and the rotating component, enables the inert gas to fully react and contact with the liquid aluminum in the degassing cylinder. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the ventilation pipe and lifting assembly of this utility model.

[0022] Figure 3 This is a schematic diagram showing the structure of the ventilation pipe, nozzle, connecting ring, stirring rod, and air dispersion assembly of this utility model.

[0023] Figure 4 This is a structural diagram showing the disassembled assembly of the support frame and rotating component of this utility model;

[0024] Figure 5 This is a schematic diagram of the mounting bracket of this utility model.

[0025] In the diagram: 1. Degassing cylinder; 2. Ventilation pipe; 3. Nozzle; 4. Mounting bracket; 5. Reciprocating screw; 6. Screw nut; 7. First motor; 8. Connecting frame; 9. Support ring; 10. Support frame; 11. Fixing plate; 12. Rotating pipe; 13. Dispersing circular pipe; 14. Second motor; 15. Drive gear; 16. Drive gear ring; 17. Protective cover; 18. Connecting ring; 19. Stirring rod; 20. Connecting pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1 to 5A degassing device for aluminum alloy castings includes a degassing cylinder 1, a vent pipe 2, a gas dispersion component, nozzles 3, and a rotating component. The vent pipe 2 is installed on the side of the degassing cylinder 1 via a lifting component. The gas dispersion component is installed on the vent pipe 2 and is used to evenly disperse inert gas into the degassing cylinder 1. Several nozzles 3 are provided, and all nozzles 3 are installed on the gas dispersion component. The rotating component is installed on the lifting component and is used to drive the gas dispersion component to rotate, thereby making the introduced inert gas fine and evenly distributed.

[0028] like Figure 2 and Figure 5 As shown, when degassing liquid aluminum, the nozzle 3 is first moved down by the lifting assembly to enter the liquid aluminum. It should be noted that the nozzle 3 is a graphite rotor nozzle 3, which can be made of high-purity anti-oxidation graphite material. It has the characteristics of high strength, high temperature resistance and corrosion resistance. It can protect the liquid aluminum and reduce damage by extending into the liquid aluminum. The lifting assembly includes a mounting frame 4, a reciprocating screw 5, a first motor 7, a connecting frame 8, a support ring 9 and a support frame 10. The mounting frame 4 is fixedly installed on the side of the degassing cylinder 1. The reciprocating screw 5 is rotatably installed on the mounting frame 4 and a matching screw nut 6 is provided on the reciprocating screw 5. The first motor 7 is installed at the bottom of the mounting frame 4 and the output end of the first motor 7 is coaxially connected to the reciprocating screw 5. The connecting frames 8 are fixedly installed on both sides of the screw nut 6. The support ring 9 is fixedly installed between the two connecting frames 8 and the vent pipe 2 is fixedly installed through the support ring 9. The support frame 10 is fixedly installed on the side of the two connecting frames 8.

[0029] Specifically, by starting the first motor 7, the first motor 7 drives the reciprocating screw 5 to rotate on the mounting bracket 4. Because the mounting bracket 4 has a sliding groove on its side, the screw nut 6 is slidably installed in the sliding groove through the slider. The screw nut 6 moves down on the reciprocating screw 5, and drives the connecting bracket 8 and the connecting ring 18 to move down. The connecting ring 18 then drives the vent pipe 2 to move down, thereby causing the nozzle 3 to move down into the liquid aluminum in the degassing cylinder 1.

[0030] like Figure 3As shown, after the nozzle 3 is lowered in, inert gas can be introduced into the degassing cylinder 1 through the aeration assembly. The aeration assembly includes a fixed plate 11, a rotating pipe 12, and an aeration circular pipe 13. The fixed plate 11 is fixedly installed on the side of the support frame 10. The rotating pipe 12 is rotatably installed through the bottom end of the air pipe 2 and is also rotatably installed through the fixed plate 11. The aeration circular pipe 13 is connected to the bottom end of the rotating pipe 12 through a connecting pipe 20, and the connecting pipe 20 and the bottom of the aeration circular pipe 13 are connected. Each end is connected to a nozzle 3. Specifically, one end of the vent pipe 2 is located outside the degassing cylinder 1. It can be connected to a gas storage tank for storing inert gas through a gas compressor. Then, it is connected to one end of the vent pipe 2, and the inert gas enters the connecting pipe 20 and the gas dispersing pipe 13 through the vent pipe 2 and the rotating pipe 12. After passing through multiple nozzles 3, it enters the degassing cylinder 1 and comes into contact with and mixes with the liquid aluminum. The nozzles 3 at multiple positions spray out the inert gas, which can better mix the inert gas with the liquid aluminum in the degassing cylinder 1.

[0031] like Figure 4 As shown, the nozzle 3 can be rotated via a rotating assembly while the air is being supplied. The rotating assembly includes a second motor 14, a drive gear 15, a drive gear ring 16, and a protective cover 17. The second motor 14 is fixedly mounted on the bottom of the support frame 10 via a mounting plate. The drive gear 15 is fixedly connected to the output end of the second motor 14. The drive gear ring 16 is fixedly mounted on the rotating tube 12 and meshes with the drive gear 15. The protective cover 17 is detachably mounted on the fixing plate 11, and both the drive gear 15 and the drive gear ring 16 are located inside the protective cover 17. Specifically, when the second motor 14 is started, the output end of the second motor 14 drives the drive gear 15 to rotate, and the drive gear 15 drives the meshing gear 16 to rotate. The drive gear ring 16 rotates, which in turn drives the rotating tube 12 to rotate within the vent pipe 2. It should be noted that the rotating tube 12 rotates within the vent pipe 2 via a rotating sealing joint, which in turn drives the connecting tube 20 and the diffuser tube 13 to rotate. The nozzle 3 rotates synchronously. When the inert gas is ejected in a rotating state, the bubbles are radially stretched under centrifugal force. Due to the viscous resistance of the surrounding molten aluminum, the surface area of ​​the bubbles increases, allowing for more thorough contact with the molten aluminum. Furthermore, two connecting rings 18 are fixedly installed on the connecting tube 20, and a stirring rod 19 is detachably installed at the bottom of each connecting ring 18. The stirring rod 19 can rotate along with the inert gas being introduced, resulting in more uniform mixing.

[0032] Working principle: During degassing, the degassing device for this aluminum alloy casting first starts the first motor 7, which drives the reciprocating screw 5 to rotate on the mounting frame 4. Because the mounting frame 4 has a sliding groove on its side, the screw nut 6 is slidably installed in the sliding groove through the slider. The screw nut 6 moves down on the reciprocating screw 5, and drives the connecting frame 8 and the connecting ring 18 to move down. The connecting ring 18 then drives the vent pipe 2 to move down, thereby causing the nozzle 3 to move down into the liquid aluminum in the degassing cylinder 1. After the nozzle 3 is moved down, it can be connected to the gas storage tank storing inert gas through the gas compressor, and then connected to one end of the vent pipe 2. The inert gas enters the connecting pipe 20 and the gas dispersing pipe 13 through the vent pipe 2 and the rotating pipe 12. After passing through multiple nozzles 3, it enters the degassing cylinder 1 and comes into contact with and mixes with the liquid aluminum. The multiple nozzles 3 spray out the inert gas, which can better mix the inert gas with the liquid aluminum in the degassing cylinder 1.

[0033] Simultaneously with the introduction of inert gas, the second motor 14 is started. The output end of the second motor 14 drives the drive gear 15 to rotate, which in turn drives the drive gear ring 16 meshing with it to rotate. The drive gear ring 16 drives the rotating tube 12 to rotate inside the ventilation tube 2, which in turn drives the connecting tube 20 and the diffuser tube 13 to rotate. The nozzle 3 rotates synchronously. Two connecting rings 18 are fixedly installed on the connecting tube 20, and the bottom end of the connecting ring 18 is detachably equipped with a stirring rod 19. The stirring rod 19 can rotate along with the inert gas while it is introduced, making the mixing more uniform.

[0034] It should be added that this degassing method is an open degassing process, so there is no need to install a cylinder cover on the top of the degassing cylinder 1 during degassing.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Degassing device for aluminium alloy castings, comprising a degassing cylinder (1), characterised in that, Also includes: Ventilation pipe (2), which is installed on the side of the degassing cylinder (1) via a lifting assembly; A gas dispersing assembly is provided on the vent pipe (2) for dispersing inert gas evenly into the degassing cylinder (1). The nozzle (3) is provided in a plurality of such nozzles, and all such nozzles (3) are provided on the air dispersing assembly; A rotating component is disposed on the lifting component and is used to drive the gas dispersing component to rotate, thereby making the introduced inert gas fine and evenly distributed.

2. A degassing device for an aluminum alloy casting according to claim 1, characterized by, The lifting assembly includes: Mounting bracket (4), which is fixedly mounted on the side of the degassing cylinder (1); A reciprocating lead screw (5) is rotatably mounted on the mounting bracket (4), and a matching lead screw nut (6) is provided on the reciprocating lead screw (5); The first motor (7) is mounted on the bottom end of the mounting bracket (4), and the output end of the first motor (7) is coaxially connected to the reciprocating screw (5); Connecting bracket (8), both sides of the lead screw nut (6) are fixedly installed with connecting bracket (8); A support ring (9) is fixedly installed between the two connecting frames (8), and the vent pipe (2) is fixedly installed through the support ring (9); A support frame (10) is fixedly installed on the sides of the two connecting frames (8).

3. A degassing apparatus for an aluminum alloy casting according to claim 2, wherein The gas dissipation assembly includes: A fixing plate (11) is fixedly installed on the side of the support frame (10); A rotating tube (12) is rotatably mounted through the bottom end of the vent pipe (2) and rotatably mounted through the fixed plate (11); A diffuser pipe (13) is connected to the bottom end of the rotating pipe (12) via a connecting pipe (20), and a nozzle (3) is connected to the bottom end of both the connecting pipe (20) and the diffuser pipe (13).

4. A degassing device for an aluminum alloy casting according to claim 3, wherein The rotating component includes: The second motor (14) is fixedly mounted on the bottom end of the support frame (10) by a mounting plate; A drive gear (15) is fixedly connected to the output end of the second motor (14); A drive gear ring (16) is fixedly mounted on the rotating tube (12) and meshes with the drive gear (15); The protective cover (17) is detachably mounted on the fixing plate (11), and the drive gear (15) and the drive gear ring (16) are both located inside the protective cover (17).

5. A degassing apparatus for an aluminum alloy casting according to claim 4, wherein Two connecting rings (18) are fixedly installed on the connecting pipe (20), and a stirring rod (19) is detachably installed at the bottom end of the connecting ring (18).

6. A degassing apparatus for an aluminum alloy casting according to claim 5, wherein The mounting bracket (4) has a sliding groove on its side, and the lead screw nut (6) is slidably installed in the sliding groove by a slider.

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