A magnesium alloy material melting device

Abstract

A magnesium alloy material smelting device comprises a furnace and a disc-type filling device, wherein the disc-type filling device comprises a stirring shaft, a filling basket and a disc-type stirring head, wherein the stirring shaft is connected to the filling basket, and the bottom of the filling basket is connected to the disc-type stirring head, wherein the disc-type stirring head comprises a plurality of stirring wings, wherein the stirring wings are connected to the filling basket and the stirring disk, wherein the connecting ends of the stirring wings are connected to each other, and the stirring ends extend to the edge of the stirring disk, and a liquid through hole is provided on the side wall of the filling basket; in the process of preparing and processing magnesium alloy, the disc-type stirring head can accelerate diffusion, and the rotation of the disc-type stirring head can divide the molten liquid into an upper and lower layer, wherein the upper molten liquid forms a solution vortex, and the diffusion of the intermediate alloy elements is accelerated; and the lower molten liquid remains relatively still, thereby preventing the precipitated slag from turning over, shortening the slag precipitation time, and improving the productivity.

Description

Technical Field

[0001] The invention relates to the technical field of alloy smelting, in particular to a magnesium alloy material smelting device. Background Art

[0002] Magnesium alloy is an alloy composed of magnesium and other elements. Its characteristics are: low density (1.8g / cm 3 About 1000 tons), high strength, large elastic modulus, good heat dissipation, good shock absorption, greater impact load bearing capacity than aluminum alloy, and good resistance to organic and alkali corrosion. The main alloying elements are aluminum, zinc, manganese, cerium, thorium, and a small amount of zirconium or cadmium. The most widely used is magnesium-aluminum alloy, followed by magnesium-manganese alloy and magnesium-zinc-zirconium alloy. At present, the progress of science and technology has increased the requirements for new materials, and the reduction of magnesium alloy prices and the superior performance of magnesium alloys have made magnesium alloys used in aviation, aerospace, transportation, chemical industry, rockets and other industrial fields.

[0003] However, my country's raw magnesium production technology is relatively backward, and the magnesium alloy smelting and casting technology is relatively late, which is a certain gap with foreign advanced technologies, resulting in unstable quality of my country's magnesium alloy products. Therefore, it is necessary to study the smelting technology of magnesium alloys. Due to the strong chemical activity of magnesium, magnesium and magnesium alloys are easily oxidized or even burned by molten magnesium and oxygen in the air during the smelting process. In order to prevent the oxidation and combustion of magnesium alloys, solvent protection, flame retardant protection and gas protection are used in the smelting and casting process. These protection methods play different degrees of protection in the magnesium alloy smelting process. However, even so, in the process of preparing the alloy, it is necessary to manually clamp the pure metal and the intermediate alloy and put them into the solution for flushing, which causes the covering layer formed on the surface of the magnesium liquid to be continuously destroyed, resulting in magnesium contacting with the air, continuous burning, and forming more oxidized slag. In addition, the stirring rod will also drive the slag at the bottom of the furnace to turn upward continuously during the stirring process, resulting in low consistency of production material performance and chemical composition, uneven composition, and low yield; the slag static precipitation process takes a long time and is inefficient; the workers are inefficient and the labor intensity is high. Summary of the invention

[0004] In view of the prior art, the present invention aims to provide a magnesium alloy material smelting device, which can prevent the slag from turning over while stirring to accelerate diffusion, thereby shortening the static precipitation time.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A magnesium alloy material smelting device comprises a furnace and a disc-type filling device, wherein the disc-type filling device comprises a stirring shaft, a filling basket and a disc-type stirring head, wherein the stirring shaft is connected to the filling basket, and the bottom of the filling basket is connected to the disc-type stirring head, and the disc-type stirring head comprises a plurality of stirring wings, wherein the stirring wings are connected to the filling basket and the stirring disk, and the connecting ends of the stirring wings are connected to each other, and the stirring ends extend to the edge of the stirring disk to stir the magnesium alloy solution, and the side wall of the filling basket is provided with liquid holes to form liquid exchange with the solution outside the filling basket.

[0007] In some embodiments, the stirring wing is a right-angled trapezoidal structure, wherein the hypotenuse is a concave arc.

[0008] In some embodiments, the stirring wing is an arc-shaped surface from the connecting end to the stirring end, and the angle between the tangent direction of the stirring end and the tangent direction of the connecting end is θ.

[0009] In some embodiments, the angle θ is 30°-45°.

[0010] In some embodiments, the stirring disk is in the shape of a disk, and the diameter is 2-3 times that of the filling basket.

[0011] In some embodiments, there are four stirring wings, and each adjacent stirring wings are vertically connected to each other.

[0012] In some embodiments, the disc-type filling device further comprises a partition plate, wherein the partition plate divides the filling basket into a plurality of filling bins.

[0013] In some embodiments, there are four evenly spaced partitions, dividing the filling basket into four filling bins.

[0014] In some embodiments, liquid holes are evenly arranged at the bottom of the filler basket.

[0015] In some embodiments, the disc-type packing device is made of steel material.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention realizes that a large amount of pure metal blocks and intermediate alloys can be uniformly added at one time, and the metal blocks and intermediate alloys are isolated from the air after addition, and the surface covering layer is not damaged. The added alloy is melted, diffused and distributed through the filler basket. In the process of preparing and processing the magnesium alloy, the disc stirring head can accelerate the diffusion. The rotation of the disc stirring head can divide the molten metal into an upper and lower layer. The upper molten metal forms a solution vortex to accelerate the diffusion of the intermediate alloy elements; the lower molten metal remains relatively still to avoid the precipitation of slag turning up, shorten the slag precipitation time, and improve the productivity. The magnesium alloy prepared by the present invention has uniform performance and chemical composition distribution, high consistency, ensures the standardization of materials, reduces human random factors, and the prepared alloy material can better meet the material design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the magnesium alloy material melting device of the present invention.

[0019] Figure 2 It is a structural schematic diagram of a disc-type filler stirring device in the first embodiment of the magnesium alloy material melting device of the present invention.

[0020] Figure 3 It is a front view of the stirring wing of the first embodiment of the magnesium alloy material melting device of the present invention.

[0021] Figure 4 It is a stereoscopic view of the stirring wing of the second embodiment of the magnesium alloy material melting device of the present invention.

[0022] Figure 5 It is a top view of the disc-type filler stirring device in the second embodiment of the magnesium alloy material melting device of the present invention.

[0023] Figure 6 It is a schematic diagram of solution flow in the magnesium alloy material smelting device of the present invention.

[0024] In the figure: 1-furnace, 2-disc-type filling device, 3-stirring shaft, 4-partition, 5-filling basket, 6-liquid hole, 7-disc-type stirring head, 8-stirring wing, 9-stirring disc, 81-connecting end, 82-stirring end. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and in combination with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Please refer to the following Figure 1-6 The magnesium alloy material melting device according to the embodiment of the present invention is described in conjunction with the embodiments.

[0028] like Figure 1-3The first embodiment of the present invention is a smelting device for magnesium alloy material, comprising a furnace 1, a disc-type filling device 2, wherein the disc-type filling device 2 comprises a stirring shaft 3, a filling basket 5, a disc-type stirring head 7, a partition 4, and a liquid through hole 6; the stirring shaft 3 is connected to the filling basket 5, and the bottom of the filling basket 5 is connected to the disc-type stirring head 7, and the disc-type stirring head 7 comprises a plurality of stirring wings 8, wherein the upper end of the stirring wing 8 is connected to the bottom of the filling basket 5, and the lower end is connected to a stirring dish 9, wherein the stirring dish 9 is disc-shaped, and the diameter is 2-3 times that of the filling basket 5; the stirring wing 8 is divided into a connecting end 81 and a fixed end, wherein the connecting end 81 is connected to each other at the central axis of the filling basket 5, and the stirring end 82 extends out of the filling basket 5 and is placed at the edge of the stirring dish 9 for driving and stirring the magnesium alloy solution. In this embodiment, there are 4 stirring wings 8, which are evenly distributed at the bottom of the filling basket 5, and the stirring wing 8 is in the shape of a right-angled trapezoidal disc, wherein the hypotenuse is an inwardly concave arc, which can ensure Stirring stability, the stirring shaft 3 extends the filling basket 5 and the disc-type stirring head 7 into the furnace 1 into the aluminum alloy melt. In order to ensure uniform diffusion during the stirring process, the filling basket 5 is preferably a cylinder, and of course it can also be other structures that can meet the filling requirements; a number of partitions 4 are arranged in the filling basket 5 according to the required number of metal blocks and intermediate alloys, and the partitions 4 divide the filling basket 5 into a number of filling bins, so that the intermediate alloys are placed evenly, ensuring the consistency of alloy melting, and at the same time, the intermediate alloys will not be offset to the same side due to centrifugation, causing wear of the stirring equipment; in this embodiment, as a preference, the partitions 4 are 4, and the partitions 4 evenly divide the filling basket 5 into 4 filling bins, and the outer wall of the filling basket 5 and the bottom of the filling basket 5 are provided with liquid holes 6 to ensure the flow exchange of the solution inside and outside the filling basket 5. In order to avoid the influence of high temperature on the stirring head and the filling basket 5 during long-term use, the disc-type filling device 2 is made of steel material.

[0029] The second embodiment of the present invention is Figure 4-5 As shown, the difference from the first embodiment is that: the plane of the stirring wing 8 is preferably an arc surface, and the arc stirring wing 8 can reduce power consumption. The angle between the tangent direction of the stirring end 82 and the tangent direction of the stirring disc 9 at the corresponding position is θ, and the angle θ is preferably 30°-45°.

[0030] When the present invention is actually used, firstly, the metal blocks of the required master alloy are uniformly added to the filling bin, and the filling basket 5 is sunk into the magnesium solution along with the stirring head. The magnesium solution is injected into the filling bin through the side wall of the filling basket 5 and the bottom liquid through hole 6, so that the added metal blocks are slowly melted. The disc-type stirring head 7 rotates and stirs to accelerate the diffusion of the master alloy melt through the liquid through hole 6. Part of the slag will be generated during the stirring process, and some of the slag with a smaller diameter will flow into the magnesium alloy solution along the liquid through hole 6. After entering the magnesium alloy solution, the slag will settle to the bottom of the solution. At this time, the stirring disc 9 can divide the melt into two parts, the upper melt forms a vortex under the stirring of the stirring end 82 of the stirring wing 8 to accelerate the diffusion of the master alloy melt, and the lower melt is relatively still to ensure that the slag settled at the bottom does not turn up.

[0031] Unlike aluminum, magnesium forms a loose oxide film on its surface after oxidation, which will produce tensile stress on the surface of the molten metal, causing further oxidation and combustion of the lower part. Therefore, flux and gas protection are sprinkled on the surface of the molten metal to make the surface film structure dense and prevent further oxidation and combustion.

[0032] Due to the dish-shaped design, the liquid moves axially upward and radially. When the radial movement encounters the furnace wall, it will move upward and downward along the furnace wall. Due to the centrifugal force of the packing basket 5, the liquid in the packing basket 5 will be in a critical motion state, causing the upward moving liquid to circulate along the furnace wall and the stirring rod, performing laminar motion. The oxide film formed on the surface will not be destroyed during the laminar motion of the liquid.

[0033] When the liquid moves upward along the agitator head, it encounters the bottom of the packing basket 5, forming a small loop circulation, but at the same time it will encounter the liquid circulation radially upward and back along the furnace wall, resulting in turbulence between the packing basket 5 and the disc, and the area near the packing basket 5 forms a transition mixing zone, while the area far away from the packing basket 5 still performs laminar flow motion.

[0034] Impurities in the magnesium alloy refining process will settle to the bottom of the furnace due to their high density. The baffle of the stirring wing 8 prevents the impurities at the bottom of the furnace from being rolled up again and mixed into the circulating flow of the solution. At the same time, the liquid movement that moves downward radially against the furnace wall will offset each other and cannot form a circulation, forming a dead zone for liquid flow.

[0035] The magnesium alloy solution reacts easily with oxygen and water vapor in the air, and a dense oxide film is formed on the surface of the magnesium liquid during the smelting process, which can prevent the magnesium liquid from further oxidation. Due to the blade head design, the stirring head moves axially and radially under the action of the high-speed rotating impeller. The bottom of the filler basket 5 acts as a baffle to hinder the axial upward movement of the liquid. When the axial component velocity makes the liquid flow downward axially, when it flows to the bottom of the furnace, it turns back along the furnace wall to return to the impeller. When the radial component velocity makes the liquid flow along the circumferential direction, it encounters the furnace wall and is divided into upward flow and downward flow. The radially downward part of the liquid encounters the liquid generated by the axial return to the furnace wall to form turbulence. The radially upward part of the liquid moves upward along the furnace wall in a steady flow, which will not produce swirling phenomenon, so it will not destroy the dense oxide film formed on the surface, and it will also quickly drive the slag inclusions of the magnesium liquid to gather upward, achieving a rapid slag removal effect.

[0036] Since the vortex is only formed on the upper part of the stirring disc 9, it will not damage the covering film formed on the surface of the magnesium alloy, preventing the intervention of air during the smelting process, and will not affect the slag below the stirring disc 9, effectively preventing the slag below the stirring disc 9 from being drawn into the solution again; the flow direction of the magnesium liquid is parallel to the stirring shaft 3, and the magnesium liquid is pushed by the stirring wing 8. The disc-type stirring head 7 can make the magnesium liquid flow downward and flow to the plane of the stirring disc 9. After the magnesium liquid encounters the stirring disc 9, it turns upward to form an up and down circulation flow; due to its own rotation, the mechanical energy is transmitted to the liquid, causing forced convection of the liquid in the furnace, and the intermediate alloy in the filling bin is subjected to the centrifugal force, which fully mixes the melted droplets with the magnesium solution and diffuses outward through the liquid through hole 6. At the same time, the liquid flow formed by the rotation of the disc-type stirring head 7 will quickly circulate the mixed liquid in the filling basket 5 and its vicinity until it is dispersed to other positions, resulting in the formation of an alloy concentration gradient in the vicinity of the filling basket 5, which in turn promotes the faster melting of the intermediate alloy block in the filling basket 5 to form a concentration balance of the mixed solution. At the same time, the mixed liquid thrown out of the filling basket 5 and the liquid driven by the stirring head have different flow speeds, so that the liquid at the junction of the two is subjected to strong shearing action; in addition, the magnesium solution on the filling basket 5 quickly replenishes the gap left by the mixed liquid outside the liquid through hole 6 due to centrifugal action, and continues to flush the intermediate alloy, until all the intermediate alloy blocks in the filling bin are melted into the magnesium solution and diffused evenly.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] The present invention realizes that a large amount of pure metal blocks and intermediate alloys can be uniformly added at one time, and the metal blocks and intermediate alloys are isolated from the air after addition, and the surface covering layer is not damaged. The added alloy is melted, diffused and distributed through the filler basket. In the process of preparing and processing the magnesium alloy, the disc stirring head can accelerate the diffusion. The rotation of the disc stirring head can divide the molten metal into an upper and lower layer. The upper molten metal forms a solution vortex to accelerate the diffusion of the intermediate alloy elements; the lower molten metal remains relatively still to avoid the precipitation of slag turning up, shorten the slag precipitation time, and improve the productivity. The magnesium alloy prepared by the present invention has uniform performance and chemical composition distribution, high consistency, ensures the standardization of materials, reduces human random factors, and the prepared alloy material can better meet the material design requirements.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnesium alloy material smelting device, comprising a furnace (1) and a disc-type filling device (2), characterized in that: The disc-type filling device (2) comprises a stirring shaft (3), a filling basket (5), and a disc-type stirring head (7); the stirring shaft (3) is connected to the filling basket (5); the bottom of the filling basket (5) is connected to the disc-type stirring head (7); the disc-type stirring head (7) comprises a plurality of stirring wings (8); the stirring wings (8) are connected to the filling basket (5) and the stirring disc (9); the connecting ends (81) of the stirring wings (8) are connected to each other; the stirring ends (82) extend to the edge of the stirring disc (9) to stir the magnesium alloy solution; and the side wall of the filling basket (5) is provided with a liquid through hole (6) to form a liquid exchange with the solution outside the filling basket (5); The stirring wing (8) is a right-angled trapezoidal structure, wherein the hypotenuse is an inwardly concave arc; The stirring wing (8) is an arc-shaped surface from the connection end (81) to the stirring end (82), and the angle between the tangent direction of the stirring end (82) and the tangent direction of the stirring disc (9) at the corresponding position is θ; The stirring disc (9) is disc-shaped, and its diameter is 2-3 times that of the filling basket (5); The disc-type filling device (2) further comprises a partition (4), wherein the partition (4) divides the filling basket (5) into a plurality of filling bins.

2. A magnesium alloy material smelting device according to claim 1, characterized in that: The angle θ is 30°-45°.

3. A magnesium alloy material smelting device according to any one of claims 1-2, characterized in that: There are four stirring wings (8), and adjacent stirring wings (8) are vertically connected to each other.

4. The magnesium alloy material smelting device according to claim 1, characterized in that: The partition plates (4) are four evenly arranged, dividing the filling basket (5) into four filling bins.

5. The magnesium alloy material smelting device according to claim 1, characterized in that: The bottom of the filler basket (5) is also evenly provided with liquid holes (6).

6. A magnesium alloy material smelting device according to any one of claims 1-2, 4-5, characterized in that: The disc-type filling device (2) is made of steel material.

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