Molten aluminum stirring device

Abstract

The utility model discloses a molten aluminum stirring device which comprises a rotor which penetrates through a through hole in a partition plate in a crucible to enter molten aluminum to stir the molten aluminum, a driving device used for driving the rotor to rotate and a connecting rod connecting the rotor and the driving device, and the rotor comprises a rotor body fixedly connected with the connecting rod. A plurality of telescopic structures capable of stretching out or retracting are uniformly arranged on the rotor main body in the circumferential direction of the rotating shaft, stretch out of the rotor main body to enlarge the stirring range of the rotor, and retract into the rotor main body to reduce the size of the rotor so that the rotor can conveniently penetrate through the through hole in the middle partition plate. The stirring device is further provided with a retracting mechanism used for controlling the telescopic structure to stretch out of or retract into the rotor body, and stretching or retracting of the telescopic structure outside the middle partition plate can be controlled. By applying the aluminum liquid stirring device, the technical problems that the colander needs to be frequently replaced, harmful impurities are easily generated, the stirring stability is poor and the labor intensity of workers is high when the aluminum liquid is manually stirred in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum alloy metallurgical equipment, in particular to an aluminum liquid stirring device. Background Art

[0002] Al-Cu alloy castings, such as aluminum alloys with grades ZL201A and ZL205A, are widely used in the automotive and military industries due to their excellent mechanical properties at room temperature and high temperatures. This high-quality material is the first choice for aluminum castings in the manufacture and design of aircraft.

[0003] However, Al-Cu alloys are prone to compositional segregation during the casting process, which in turn affects the quality of castings. Existing research shows that the main cause of compositional segregation is the lack of stirring during the solidification of the molten aluminum. Furthermore, due to the long solidification time, the denser phases (such as Cu, Mn, and Ti) in the molten aluminum easily sink, resulting in compositional segregation.

[0004] Existing production technology primarily relies on mechanical stirring. To ensure immediate casting after stirring, a separator is typically placed on the crucible, and a slotted spoon is inserted into the bottom of the molten aluminum to stir clockwise for 3-5 minutes. This process is manual and requires skilled technique to ensure sufficient stirring of the molten aluminum at the bottom of the crucible without disrupting the oxide film on the surface, thereby preventing air entrainment during stirring.

[0005] The stirring operation in the existing technology has the following problems. First, the stirring operation requires experienced and skilled workers, and it is difficult to fix the personnel; and when stirring, the operator steps on the middle partition, and there is an aluminum liquid crucible furnace below. The overall operating environment is high-temperature operation, and the stirring time is relatively long, so the operator needs to be replaced in the middle, which easily leads to unstable stirring quality. Second, the colander currently used for stirring is made of a stainless steel tube that has been painted. This material will cause oxidation when used in aluminum liquid for a long time, increasing the content of harmful impurities Fe in the aluminum liquid. Therefore, the colander needs to be replaced frequently and has a short service life. Third, the stirring operation and the riser tube share the through hole on the middle partition. When the riser tube is placed, the stirring space is occupied, affecting the stirring effect. Summary of the Invention

[0006] The utility model aims to provide an aluminum liquid stirring device, which can solve the technical problems of the existing manual aluminum liquid stirring, such as the need to frequently replace the colander, easy generation of harmful impurities, poor stirring stability, and high labor intensity for workers.

[0007] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0008] A device for stirring molten aluminum comprises a rotor which passes through a through hole on a middle partition of a crucible and enters into the molten aluminum to stir the aluminum, a driving device for driving the rotor to rotate, and a connecting rod connecting the rotor and the driving device. The rotor comprises a rotor main body fixedly connected to the connecting rod, and a plurality of telescopic structures which can be extended or retracted are evenly provided on the rotor main body in the circumferential direction of the rotating shaft. The telescopic structures extend from the rotor main body to increase the stirring range of the rotor, and the telescopic structures are retracted into the rotor main body to reduce the volume of the rotor to facilitate the rotor to pass through the through hole on the middle partition.

[0009] Furthermore, the stirring device is provided with a retracting mechanism for controlling the extension or retraction of the telescopic structure to the rotor body, which can realize the control of the extension or retraction of the telescopic structure from outside the partition.

[0010] Furthermore, the retraction and extension mechanism includes an operating rod mounted on the connecting rod, which can slide along the length direction of the connecting rod. A moving pull rod is provided between the end of the operating rod close to the rotor body and the telescopic structure. One end of the moving pull rod is rotatably connected to the operating rod, and the other end is rotatably connected to the telescopic structure. The operating rod slides along the length direction relative to the connecting rod, and can drive the telescopic structure to extend or retract through the moving pull rod.

[0011] Furthermore, a locking structure is provided between the operating rod and the connecting rod for locking the operating rod on the connecting rod, thereby keeping the telescopic structure in an extended or retracted state.

[0012] Furthermore, the rotor body is evenly provided with grooves in the circumferential direction of the rotating shaft, the number of which is the same as the number of the telescopic structures. The telescopic structures are movably arranged in the grooves and can be extended or retracted in the grooves.

[0013] Furthermore, the telescopic structure includes a telescopic plate and a moving pull plate. The telescopic plate is provided with a slot perpendicular to the movement direction of the telescopic structure. The moving pull plate is slidably arranged in the slot. The moving pull rod is rotatably connected to the moving pull plate.

[0014] Furthermore, the connecting rod, operating rod, movement pull rod and movement pull plate are all made of titanium alloy, the rotor body and telescopic plate are both made of graphite, and are subjected to two impregnation treatments.

[0015] Furthermore, the driving device is arranged on the middle partition through a bracket.

[0016] After adopting the above technical solution, the utility model has the following beneficial effects:

[0017] 1. The stirring device in this utility model does not require high manual skills to use. It can be used after training, thus avoiding the influence of human factors on the uneven composition of the aluminum liquid;

[0018] 2. The stirring device in this utility model only requires one person to operate the entire process, which can reduce the demand for manual workstations and shorten the time workers spend working in high temperatures;

[0019] 3. The stirring device in the utility model is immersed in the aluminum liquid and is mainly made of graphite, which will not cause the Fe element in the aluminum liquid to exceed the standard. It has a long service life and does not need to be replaced frequently.

[0020] 4. The stirring device of the utility model has a rotor that is submerged in the molten aluminum and can be extended and retracted, thereby increasing the stirring range and making the degree of homogenization of the molten aluminum composition more stable and reliable;

[0021] 5. The stirring device of the present invention can fully stir aluminum liquids of different melting amounts by recording, adjusting and monitoring the rotation speed during the stirring process, thereby realizing visual, standardized and normalized operation and avoiding experience-based operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the telescopic structure of the utility model in a retracted state.

[0023] Figure 2 It is a schematic diagram of the overall structure of the telescopic structure of the utility model in an extended state.

[0024] Figure 3 It is a schematic diagram of the overall structure of the rotor, connecting rod and retractable structure in the utility model.

[0025] Figure 4 It is a schematic diagram of the overall structure of the connection between the lower part of the rotor body and the connecting rod in the utility model.

[0026] Figure 5 It is a schematic diagram of the overall structure of the connection relationship between the retractable structure and the moving pull plate in the utility model.

[0027] Figure 6 It is a schematic diagram of the overall structure of the connection relationship between the retractable structure, the telescopic structure and the lower part of the rotor body in the utility model.

[0028] Figure 7 It is a schematic diagram of the overall structure of the connection relationship between the lower part of the rotor body and the upper part of the rotor body in the utility model.

[0029] Description of the drawings: 1. Crucible, 11. Middle cover plate, 2. Rotor, 21. Rotor body, 211. Lower part of rotor body, 212. Upper part of rotor body, 213. Bolt, 214. Graphite sealing bolt, 22. Telescopic structure, 221. Telescopic plate, 222. Movable pull plate, 3. Driving device, 4. Connecting rod, 41. Positioning pin, 5. Retracting and extending mechanism, 51. Operating lever, 511. Handle, 52. Movable pull rod, 6. Bracket. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following further describes in detail the characteristics and performance of an aluminum liquid stirring device in the present invention in conjunction with the accompanying drawings and embodiments.

[0031] Please see the attached Figures 1 to 7 A device for stirring molten aluminum includes a rotor 2 that passes through a through hole on a middle diaphragm 11 of a crucible and enters the molten aluminum to stir the aluminum, a driving device 3 for driving the rotor 2 to rotate, and a connecting rod 4 connecting the rotor 2 and the driving device 3, wherein the driving device 3 is arranged on the middle diaphragm 11 through a bracket 6, and the driving device 3 uses a servo motor.

[0032] The rotor 2 comprises a rotor body 21 and multiple telescopic structures 22 movably mounted on the rotor body 21. The rotor body 21 is fixedly connected to the connecting rod 4. The multiple telescopic structures 22 are evenly arranged around the circumference of the rotating axis of the rotor body 21 and can be extended or retracted. Extending the telescopic structures 22 from the rotor body 21 increases the stirring range of the rotor 2. Retracting the telescopic structures 22 into the rotor body 21 reduces the size of the rotor 2, facilitating its passage through the through-holes in the middle diaphragm 11.

[0033] In the specific design, the rotor body 21 is evenly provided with grooves in the circumferential direction of the rotating shaft, the number of which is the same as the number of the telescopic structures 22 . The telescopic structures 22 are movably arranged in the grooves and can be extended or retracted in the grooves.

[0034] The stirring device is further provided with a retracting mechanism 5 for controlling the extension or retraction of the telescopic structure 22 to the rotor body 21 , which can realize the control of the extension or retraction of the telescopic structure 22 from outside the middle partition 11 .

[0035] The retractable / extending mechanism 5 includes an operating rod 51 that is sleeved on the connecting rod 4 and can slide along the length of the connecting rod 4. A motion rod 52 is provided between the end of the operating rod 51 closest to the rotor body 21 and the telescopic structure 22. One end of the motion rod 52 is rotatably connected to the operating rod 51, and the other end is rotatably connected to the telescopic structure 22. Sliding the operating rod 51 along the length of the connecting rod 4 causes the telescopic structure 22 to extend or retract via the motion rod 52.

[0036] In the specific design, in order to facilitate assembly, the rotor body 21 includes a rotor body lower part 211 and a rotor body upper part 212. The rotor body lower part 211 and the rotor body upper part 212 are fixedly connected by bolts 213, and the connecting rod 4 passes through the rotor body upper part 212 and is fixedly connected to the rotor body lower part 211.

[0037] The telescopic structure 22 includes a telescopic plate 221 and a moving pull plate 222. The telescopic plate 221 is arranged in a groove on the rotor body 21. The telescopic plate 221 is provided with a slot perpendicular to the movement direction of the telescopic structure 22. The moving pull plate 222 is slidably arranged in the slot. The moving pull rod 52 is connected to the telescopic structure 22 by rotating with the moving pull plate 222.

[0038] A locking structure is also provided between the operating rod 51 and the connecting rod 4 to lock the operating rod 51 to the connecting rod 4, thereby maintaining the telescopic structure 22 in the extended or retracted state. Preferably, the present invention uses a locating pin 41 to lock the operating rod 51 and the connecting rod 4 axially and circumferentially. The connecting rod 4 is provided with two locating pin holes along the axial direction, corresponding to the extended and retracted states of the telescopic structure 22. The operating rod 51 is provided with a locating pin hole. Sliding the operating rod 51 so that the locating pin hole on it aligns with the locating pin hole on the connecting rod 4, and inserting the locating pin 41 can maintain the telescopic structure 22 in the extended or retracted state. The operating rod 51 is also provided with a handle 511 for convenient operation.

[0039] The connecting rod 4, the operating rod 51, the moving pull rod 52 and the moving pull plate 222 are all made of titanium alloy, and the rotor body 21 and the telescopic plate 221 are both made of graphite and are subjected to two impregnation treatments.

[0040] The upper portion 212 of the rotor body is further provided with a graphite sealing bolt 214 for preventing the bolt 213 from directly contacting the molten aluminum.

[0041] In practice, when the aluminum liquid needs to be stirred, the rotor 2, with the telescopic structure 22 in the retracted state, is inserted into the crucible through the through-hole on the middle cover 11 of the crucible 1. The drive device 3 is supported on the middle cover 11 by the bracket 6. The height of the bracket 6 is adjusted so that the rotor 2 is completely immersed in the aluminum liquid.

[0042] Pull out the positioning pin 41, push the operating rod 51 downward along the connecting rod 4 through the handle 511 to extend the telescopic structure 22 into place, reinsert the positioning pin 41 to lock the operating rod 51 and the connecting rod 4, so that the telescopic structure 22 remains in the extended position.

[0043] When the drive device 3 is activated, it drives the rotor 2 to rotate in the molten aluminum via the connecting rod 4, stirring the molten aluminum. The extension of the telescopic structure 22 increases the stirring range of the rotor 2, thereby increasing the stirring range. Furthermore, since the stirring device only passes through the surface of the molten aluminum with the connecting rod 4 and the operating rod 51, it is not easy to break the oxide film on the surface of the molten aluminum, thus preventing air entrainment.

[0044] After stirring is completed, pull out the positioning pin 41, pull the operating rod 51 upward along the connecting rod 4 through the handle 511, so that the telescopic structure 22 is retracted into place, reinsert the positioning pin 41 to lock the operating rod 51 and the connecting rod 4, so that the telescopic structure 22 remains in the retracted position.

[0045] After the telescopic structure 22 is retracted, the rotor 2 is pulled out from the aluminum liquid, and the stirring process is completed.

[0046] It should be noted that the parts not described in detail in this solution are all existing technologies. The above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the present invention.

Claims

1. A device for stirring molten aluminum, comprising a rotor (2) passing through a through hole on a partition plate (11) in a crucible and entering into the molten aluminum to stir the aluminum, a driving device (3) for driving the rotor (2) to rotate, and a connecting rod (4) connecting the rotor (2) and the driving device (3), characterized in that: The rotor (2) includes a rotor body (21) fixedly connected to a connecting rod (4). A plurality of telescopic structures (22) capable of extending or retracting are evenly arranged on the rotor body (21) in the circumferential direction of the rotating shaft. The telescopic structures (22) extend from the rotor body (21) to increase the stirring range of the rotor (2). The telescopic structures (22) retract into the rotor body (21) to reduce the volume of the rotor (2) so as to facilitate the rotor (2) to pass through the through hole on the middle partition (11).

2. The aluminum liquid stirring device according to claim 1, characterized in that: The stirring device is provided with a retracting mechanism (5) for controlling the telescopic structure (22) to extend or retract the rotor body (21), and can control the extension or retraction of the telescopic structure (22) from outside the middle partition (11).

3. The aluminum liquid stirring device according to claim 2, characterized in that: The retracting and extending mechanism (5) includes an operating rod (51) sleeved on the connecting rod (4), the operating rod (51) can slide along the length direction of the connecting rod (4), and a moving pull rod (52) is provided between one end of the operating rod (51) close to the rotor body (21) and the telescopic structure (22), one end of the moving pull rod (52) is rotationally connected to the operating rod (51), and the other end is rotationally connected to the telescopic structure (22). When the operating rod (51) slides along the length direction relative to the connecting rod (4), the telescopic structure (22) can be driven to extend or retract through the moving pull rod (52).

4. The aluminum liquid stirring device according to claim 3, characterized in that: A locking structure for locking the operating rod (51) on the connecting rod (4) is provided between the operating rod (51) and the connecting rod (4), thereby maintaining the telescopic structure (22) in an extended or retracted state.

5. The aluminum liquid stirring device according to claim 3, characterized in that: The rotor body (21) is evenly provided with grooves in the circumferential direction of the rotating shaft, the number of which is the same as the number of the telescopic structures (22). The telescopic structures (22) are movably arranged in the grooves and can be extended or retracted in the grooves.

6. The aluminum liquid stirring device according to claim 3, characterized in that: The telescopic structure (22) comprises a telescopic plate (221) and a moving pull plate (222); the telescopic plate (221) is provided with a slot perpendicular to the moving direction of the telescopic structure (22); the moving pull plate (222) is slidably arranged in the slot; and the moving pull rod (52) is rotatably connected to the moving pull plate (222).

7. The aluminum liquid stirring device according to claim 3, characterized in that: The connecting rod (4), the operating rod (51), the moving pull rod (52) and the moving pull plate (222) are all made of titanium alloy, and the rotor body (21) and the telescopic plate (221) are all made of graphite and are subjected to two impregnation treatments.

8. The aluminum liquid stirring device according to claim 1, characterized in that: The driving device (3) is arranged on the middle partition (11) through the bracket (6).

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