Smelting stirring equipment and feeding device thereof

Abstract

The invention discloses smelting stirring equipment and a feeding device thereof. The feeding device comprises an annular feeding mechanism and a gas conveying mechanism. The annular feeding mechanism comprises a cover disc which defines an annular feeding groove in a surrounding mode, and the cover disc is provided with a plurality of discharging ports which are communicated with the feeding groove and are arranged at intervals in an annular mode and at least one feeding port communicated with the feeding groove. Silicon carbide particles and other additive materials can enter the annular feeding groove through the at least one feeding port and then fall into molten aluminum through the discharging port, so that the silicon carbide particles can be fed in a dispersed mode to avoid agglomeration, the inert gas output by the gas conveying mechanism can guide the silicon carbide particles to pass through the discharging port, and the silicon carbide particles can be fed into the molten aluminum through the discharging port. And the feeding smoothness is ensured.

Description

Technical Field

[0001] The invention relates to a smelting and stirring device and a feeding device thereof, in particular to a feeding device for feeding silicon carbide particles into aluminum soup, and a smelting and stirring device with the feeding device. Background Art

[0002] Stirring smelting is an alloy smelting process. So far, there have been stirring mechanisms of different designs, such as stirring casting, in-situ autogenous casting, squeeze casting, casting and forging combined process, semi-solid casting, and semi-solid process. Figure 1 , is a stirring device 1 generally used for stirring smelting, which comprises a furnace body 11 containing molten metal soup 10, a stirring rod 12 extending from top to bottom in the furnace body 11, a stirring plate 13 fixed on the stirring rod 12, and a motor 14 located above the furnace body 11 and capable of driving the stirring rod 12 to rotate. The motor 14 can drive the stirring rod 12 and the stirring plate 13 to rotate, so as to stir the metal soup 2 in the furnace body 11.

[0003] The aforementioned stirring device 1 can also be used to assist in adding aluminum-based composite materials with granular reinforcing phases such as silicon carbide. Its characteristics are light weight and better heat transfer properties, and it is widely used in precision machining. When the aforementioned aluminum-based composite material is prepared by the stirring device 1, it is necessary to put the additive materials such as silicon carbide into the furnace body 11 containing aluminum soup from the outside, and stir and smelt to obtain aluminum reinforced by silicon carbide. However, silicon carbide is a nano-level fine particle. When the silicon carbide particles are too close to each other, they are easily affected by molecular forces and agglomerated into micron-level clumps. This causes the aluminum-based composite material to be easily produced during casting. Defects such as casting shrinkage cavities and uneven distribution of reinforcing phases, so how to avoid this situation while adding a large amount of silicon carbide particles is a problem that the current market and academia want to solve. Summary of the invention

[0004] The object of the present invention is to provide a feeding device which can uniformly feed silicon carbide particles to avoid agglomeration.

[0005] The feeding device of the present invention is suitable for smelting and stirring equipment; the feeding device comprises an annular feeding mechanism and a gas conveying mechanism, the annular feeding mechanism comprises a cover plate surrounding a feeding trough defining an annular shape, the cover plate is provided with a plurality of discharge ports connected to the feeding trough and arranged in an annular manner, and at least one feeding port connected to the feeding trough, the gas conveying mechanism comprises an air inlet pipe connected to the feeding trough and used for conveying inert gas into the feeding trough.

[0006] Preferably, the annular feeding mechanism further comprises a feeding pipe connected to the at least one feeding port, and a feeding hopper connected to the feeding pipe, and the gas conveying mechanism further comprises a gas supply source connected to the air inlet pipe to provide inert gas.

[0007] Preferably, the connection point between the air inlet duct and the cover plate is located relatively above the at least one feed inlet.

[0008] Preferably, the air inlet duct has a plurality of cyclone inclined tubes obliquely penetrating the cover plate and connected to the feeding trough, and a connecting pipeline connecting the cyclone inclined tubes and the air supply source, each cyclone inclined tube has an air inlet connected to the feeding trough and located relatively above the at least one feeding port, and the air inlets are arranged in a ring-shaped manner with intervals from each other.

[0009] Preferably, the intersection of the central axis of each air inlet and the bottom surface of the cover plate is located between two adjacent discharge ports along the circumference of the cover plate.

[0010] Preferably, the feeding device further comprises a heater arranged on the feeding hopper.

[0011] Preferably, the heater is a heating coil wound around the feeding hopper.

[0012] Preferably, the cover plate has a top wall, a bottom wall located below the top wall and having the discharge port, an outer annular wall connecting the outer edge of the top wall and the outer edge of the bottom wall, and an inner annular wall surrounded by the outer annular wall and connecting the top wall and the bottom wall, and the outer annular wall and the inner annular wall cooperate to define the feeding trough.

[0013] Preferably, the cover plate has a top wall, a bottom wall located below the top wall and provided with the discharge port, an outer annular wall connecting the outer edge of the top wall and the outer edge of the bottom wall, and an inner annular wall surrounded by the outer annular wall and connecting the top wall and the bottom wall, the outer annular wall and the inner annular wall cooperate to define the feeding trough, the cyclone inclined pipe passes through the top wall or the outer annular wall, and the at least one feed port is opened on the outer annular wall.

[0014] Another object of the present invention is to provide a smelting and stirring equipment having the feeding device.

[0015] The smelting and stirring equipment of the present invention comprises a crucible surrounding a accommodating space, a feeding device as described above, and a stirring member extending into the accommodating space through a cover plate of the feeding device in the up-down direction, wherein the cover plate is covered on the crucible to cover the accommodating space, and the discharge port is connected to the accommodating space.

[0016] The beneficial effect of the present invention is that silicon carbide particles and other additive materials can enter the annular feeding trough through the at least one feeding port, and then fall into the aluminum soup through the discharging port, thereby the silicon carbide particles can be dispersed and fed to avoid agglomeration, and the inert gas output by the gas conveying mechanism will also be sent into the feeding trough through the air inlet pipe, and then enter the crucible through the discharging port. In this way, in addition to coating the silicon carbide with the inert gas to avoid the reaction between the silicon carbide and the oxide layer on the surface of the aluminum soup, the silicon carbide particles can also be guided through the discharging port to ensure the smoothness of the feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram illustrating a stirring device generally used for stirring smelting;

[0018] Figure 2 is a schematic diagram illustrating an embodiment of a feeding device for a smelting and stirring device according to the present invention; and

[0019] Figure 3 is a top view illustrating the cover plate in the embodiment. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0021] See also Figure 2 , is an embodiment of a feeding device 3 of a smelting and stirring device 2 of the present invention, wherein the smelting and stirring device 2 comprises a feeding device 3, a crucible 21 surrounding a containing space 211 and containing aluminum soup A in the containing space 211, and a stirring member 22 extending in the containing space 211 in the up-down direction. The feeding device 3 comprises an annular feeding mechanism and a gas conveying mechanism. The annular feeding mechanism comprises a cover plate 31 which is covered on the crucible 21 and covers the containing space 211, a feeding hopper 32, a heater 33 wound around the feeding hopper 32, and a feeding pipe 34 connecting the feeding hopper 32 and the cover plate 31. The gas conveying mechanism comprises a gas supply source 35, and an air inlet pipe 36 connecting the gas supply source 35 and the cover plate 31.

[0022] See also Figure 2 and Figure 3The cover plate 31 has a top wall 311, a bottom wall 312 located below the top wall 311, an outer annular wall 313 connecting the outer edge of the top wall 311 and the outer edge of the bottom wall 312, and an inner annular wall 314 surrounded by the outer annular wall 313 and connecting the top wall 311 and the bottom wall 312. The bottom wall 312 is provided with eight discharge ports 315 arranged in annular shapes at equal angles and extending vertically. The outer annular wall 313 cooperates with the inner annular wall 314 to define a feeding trough 316 in an annular shape and connected to the discharge port 315. The outer annular wall 313 is provided with an inlet port 317 extending radially and connected to the feeding trough 316. The inner annular wall 314 allows the agitator 22 to penetrate along the up-down direction, and the agitator 22 can rotate relative to the cover plate 31 . Preferably, a bearing (not shown) is disposed between the agitator 22 and the cover plate 31 , but the present invention is not limited thereto.

[0023] In this embodiment, the heater 33 can be a heating coil continuously wound on the feeding hopper 32 to heat the silicon carbide particles B or other additive materials in the feeding hopper 32. In addition to preventing the material temperature from dropping too quickly, the wettability of the silicon carbide particles B can also be increased. The two ends of the feeding pipe 34 are respectively connected to the end of the feeding hopper 32 and the feeding port 317. The air intake pipe 36 has eight cyclone inclined pipes 361 obliquely penetrating the top wall 311 and connected to the feeding trough 316, and a connecting pipe 362 connecting the cyclone inclined pipe 361 and the air supply source 35. The cyclone inclined pipes 361 are arranged in an equiangular annular space with each other, and are inclined in a clockwise direction or a counterclockwise direction. Each cyclone inclined pipe 361 has an air inlet 363 connected to the feeding trough 316 and located above the feeding port 317, and the air inlets 363 are also arranged in an equiangular annular space with each other. The intersection of the central axis of each air inlet 363 and the bottom surface of the bottom wall 312 is located between two adjacent discharge ports 315 , so that the air inlet 363 and the discharge ports 315 are staggered in the circumferential direction.

[0024] When the stirring member 22 is stirring and melting the aluminum soup A, the silicon carbide particles B in the feeding hopper 32 can enter the feeding trough 316 through the feeding pipe 34 and the feeding port 317, and the inert gas input from the gas supply source 35 can enter the feeding trough 316 through the connecting pipeline 362 and the cyclone inclined pipe 361. The design of the cyclone inclined pipe 361 extending obliquely allows the airflow direction of the inert gas to enter the feeding trough 316 obliquely relative to the axial direction of the cover plate 31, and flow around along the annular feeding trough 316, and finally output to the accommodating space 211 through the discharge port 315 located below. In the above process, the swirling downward airflow will also drive the silicon carbide particles B to float, so that the silicon carbide particles B are evenly dispersed in the feeding trough 316, and finally discharged evenly from the discharge port 315 to be fed into the crucible 21. Feeding through the eight discharge ports 315 can significantly reduce the agglomeration of the silicon carbide particles B. In addition to being used to drive and disperse the silicon carbide particles B, the inert gas output by the gas supply source 35 can also coat the silicon carbide to prevent the silicon carbide particles B from reacting with the oxide layer on the surface of the aluminum soup A.

[0025] The design of the air inlet 363 being located above the feed inlet 317 can ensure that the silicon carbide particles B entering the feeding trough 316 can be driven by the airflow flowing downward from the top, and the staggered design of the air inlet 363 and the discharge port 315 makes the air inlet 363 not directly point to the discharge port 315, so that the airflow will not flow out of the discharge port 315 immediately, but will swirl in the feeding trough 316 for a moment before flowing out of the discharge port 315, thereby making the silicon carbide particles B more evenly distributed in the feeding trough 316. It should be particularly noted that, in addition to being inserted into the top wall 311, the cyclone inclined pipe 361 can also be penetrated on the outer ring wall 313, and the number of the feed inlets 317 can also be multiple and arranged in annular intervals on the outer ring wall 313, as long as the air inlet 363 is located above the feed inlet 317.

[0026] In summary, the present invention can disperse the silicon carbide particles B fed into the annular feeding trough 316 and finally send them out from the discharge port 315 to avoid agglomeration. The gas output from the cyclone inclined tube 361 can not only remove slag from the aluminum soup A and coat the silicon carbide particles B, but also guide the silicon carbide particles B to the discharge port 315 and help them disperse. In addition, the heater 33 can modify the silicon carbide and improve its wettability, so the purpose of the present invention can be achieved.

Claims

1. A feeding device suitable for smelting and stirring equipment; Features: The feeding device includes an annular feeding mechanism and a gas conveying mechanism. The annular feeding mechanism includes a cover plate surrounding a feeding trough that defines an annular shape. The cover plate is provided with a plurality of discharge ports that are connected to the feeding trough and are arranged in an annular shape and spaced apart from each other, and at least one feeding port that is connected to the feeding trough. The gas conveying mechanism includes an air inlet pipe that is connected to the feeding trough and is used to convey inert gas into the feeding trough.

2. The feeding device according to claim 1, Features: The annular feeding mechanism further comprises a feeding pipe connected to the at least one feeding port, and a feeding hopper connected to the feeding pipe, and the gas conveying mechanism further comprises a gas supply source connected to the gas inlet pipeline to provide inert gas.

3. The feeding device according to claim 1, Features: The connecting point between the air inlet duct and the cover plate is located relatively above the at least one feed inlet.

4. The feeding device according to claim 2, Features: The air inlet duct has a plurality of cyclone inclined tubes obliquely passing through the cover plate and connected to the feeding trough, and a connecting pipeline connecting the cyclone inclined tubes and the air supply source. Each cyclone inclined tube has an air inlet connected to the feeding trough and located relatively above the at least one feeding port, and the air inlets are arranged in a ring-shaped manner with intervals from each other.

5. The feeding device according to claim 4, Features: The intersection of the central axis of each air inlet and the bottom surface of the cover plate is located between two adjacent discharge ports along the circumference of the cover plate.

6. The feeding device according to claim 2, Features: The feeding device further comprises a heater arranged on the feeding hopper.

7. The feeding device according to claim 6, Features: The heater is a heating coil wound around the feeding hopper.

8. The feeding device according to claim 1, Features: The cover plate has a top wall, a bottom wall located below the top wall and having the discharge port, an outer annular wall connecting the outer edge of the top wall and the outer edge of the bottom wall, and an inner annular wall surrounded by the outer annular wall and connecting the top wall and the bottom wall. The outer annular wall and the inner annular wall cooperate to define the feeding trough.

9. The feeding device according to claim 4, Features: The cover plate has a top wall, a bottom wall located below the top wall and provided with the discharge port, an outer annular wall connecting the outer edge of the top wall and the outer edge of the bottom wall, and an inner annular wall surrounded by the outer annular wall and connecting the top wall and the bottom wall, the outer annular wall and the inner annular wall cooperate to define the feeding trough, the cyclone inclined pipe passes through the top wall or the outer annular wall, and the at least one feed port is opened on the outer annular wall.

10. A smelting and stirring device, Features: The smelting and stirring equipment includes a crucible surrounding a accommodating space, a feeding device as described in any one of claims 1 to 9, and a stirring member that is inserted through a cover plate of the feeding device in the up and down directions and extends into the accommodating space, the cover plate is covered on the crucible to cover the accommodating space, and the discharge port is connected to the accommodating space.

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