A new gas protection device for magnesium ingot casting

Abstract

The invention relates to a gas protection device for magnesium ingot casting, comprising a mold pre-filling gas pipe a, a mold pre-filling gas pipe b, a gas filling pipe, a pneumatic component, a control system, an electromagnetic valve, a regulating valve a, a casting protective gas pipe piece, a steel plate, a casting protective nozzle, a regulating valve b, a formed magnesium ingot protection pipe, a regulating valve c and a protective gas pipeline; before and when the magnesium ingot casting starts, the regulating valve, the electromagnetic valve and the nozzle are controlled to solve the problems of magnesium ingot surface burning during magnesium ingot casting, resulting in unqualified magnesium ingot quality, and the like.

Description

Technical Field

[0001] The invention belongs to a protective device during liquid magnesium casting, and in particular relates to a novel gas protective device for magnesium ingot casting. Background Art

[0002] As a "green and environmentally friendly material", magnesium metal must be extracted from the refining furnace or other equipment at the end of magnesium smelting, and then transported to the mold of the casting system in time to form a finished magnesium ingot. When the magnesium ingot is cast, the temperature of the liquid magnesium is 680℃ to 700℃. The high-temperature molten liquid magnesium is transported to the mold through the casting pipe. In the unprotected state, the liquid magnesium will burn violently. In the past, when the magnesium ingot was cast, the surface of the magnesium ingot was protected by spreading sulfur powder and igniting the gas generated by the sulfur powder. When the surface of the magnesium ingot was burning and the sulfur powder could not be effectively protected, the burning layer on the surface of the magnesium ingot must be scraped off. However, due to the incomplete protection when the magnesium ingot is cast or the casting is completed, the magnesium ingot will burn and oxidize on the surface, resulting in the cast magnesium ingot can only be re-melted and re-cast, so the workload is very large, and the protection of the gas generated by the spreading of sulfur powder and the burning of sulfur powder will cause environmental pollution. The long-term use of sulfur powder will cause a bad casting environment and cause physical damage to the operating staff. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of gas protection device for magnesium ingot casting. The new type of gas protection device for magnesium ingot casting solves the problem of burning of the magnesium ingot surface when liquid magnesium is cast into magnesium ingots, ensures the overall quality of the magnesium ingots, reduces the remelting work of unqualified magnesium ingots, reduces the workload of employees, reduces pollution to the environment, and improves the working environment of operators.

[0004] The present invention solves the technical problem by adopting the following technical scheme: the magnesium ingot casting gas protection device comprises a mold pre-filling gas pipe a, a mold pre-filling gas pipe b, a gas filling pipe, a pneumatic component, a control system, an electromagnetic valve, a regulating valve a, a casting protective gas pipe fitting, a steel plate, a casting protective nozzle, a regulating valve b, a forming magnesium ingot protection pipe, a regulating valve c and a protective gas pipeline; the mold pre-filling gas pipe a and the mold pre-filling gas pipe b are connected together, and when casting starts, the electromagnetic valve and the pneumatic component are controlled by the control system instruction according to the state of the mold, and the mold pre-filling gas pipe a and the mold pre-filling gas pipe b can move up and down; the casting protective gas pipe fitting, the casting protective nozzle and the regulating valve b prevent the burning of liquid magnesium when the liquid magnesium starts to be cast; the steel plate is arranged on the casting protective gas pipe fitting, and the forming magnesium ingot protection pipe and the regulating valve c protect the magnesium ingot that is about to be formed from being burned.

[0005] The beneficial effects of the present invention are as follows: (1) The air in the precasting mold is replaced by the mold pre-filling gas pipe a, the mold pre-filling gas pipe b, the solenoid valve, the regulating valve a, the pneumatic components and the control system, thereby reducing the air content in the mold and reducing the combustion of liquid magnesium. (2) The protective gas volume is adjusted by the regulating valve b, and the protective gas is passed through the casting protective gas pipe and the casting protective nozzle to protect the liquid magnesium in all directions during casting, thereby preventing the liquid magnesium from burning during casting. (3) The protective gas volume is adjusted by the regulating valve b, and the protective gas is passed through the forming magnesium ingot protection pipe to protect the cast, unfinished and formed magnesium ingots. The surface of the magnesium ingot is prevented from burning and oxidizing. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic diagram of the main structure of a novel gas protection device for magnesium ingot casting according to the present invention.

[0007] Figure 2 The figure is a schematic top view of the structure of a novel gas protection device for magnesium ingot casting according to the present invention.

[0008] The markings in the figure are as follows: 1-mold pre-filling gas pipe a, 2-mold pre-filling gas pipe b, 3-filling pipe, 4-pneumatic component, 5-control system, 6-solenoid valve, 7-regulating valve a, 8-casting protection gas pipe fittings, 9-steel plate, 10-casting protection nozzle, 11-regulating valve b, 12-forming magnesium ingot protection pipe, 13-regulating valve c, 14-protective gas supply pipeline. DETAILED DESCRIPTION

[0009] Embodiments of the present invention are described below with reference to the accompanying drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that for the purpose of clarity, the representation and description of components and processes that are not related to the present invention and are known to those of ordinary skill in the art are omitted in the drawings and descriptions.

[0010] Example

[0011] like Figure 1 , 2 A novel magnesium ingot casting gas protection device is shown, comprising a mold pre-filling gas pipe a1, a mold pre-filling gas pipe b2, a charging pipe 3, a pneumatic component 4, a control system 5, a solenoid valve 6, a regulating valve a7, a casting protection gas pipe 8, a steel plate 9, a casting protection nozzle 10, a regulating valve b11, a forming magnesium ingot protection pipe 12, a regulating valve c13 and a protective gas supply pipeline 14.

[0012] The filling tube 3 is welded at the bottom of the mold pre-filling gas tube a1 and the mold pre-filling gas tube b2 to 20 mm from the bottom of the mold, and a pneumatic component 4 is installed at the bottom of the connection between the mold pre-filling gas tube a1 and the mold pre-filling gas tube b2. The pneumatic component 4 and the solenoid valve 6 are controlled by the control system 5, and the regulating valve a7 is in a normally open state. When the liquid magnesium starts to cast the mold and is in a stopped state, the control system 5 controls the pneumatic component 4 to move, and the filling tube 3 welded at the bottom of the mold pre-filling gas tube a1 and the mold pre-filling gas tube b2 is in the mold, and the solenoid valve 6 opens the protective gas to replace the air inside the mold.

[0013] The casting protection gas pipe fitting 8 is welded from a steel pipe, and the casting protection nozzle 10 is threadedly connected to the casting protection gas pipe fitting 8. The installation angle of the casting protection nozzle 10 is adjusted according to the shape and parameters of the mold, but it must be ensured that the casting mold, especially the position where the liquid magnesium flows out of the casting pipe, must be protected by gas; the steel plate 9 is welded to the casting protection gas pipe fitting 8, and a hole is reserved at the casting pipe position according to the size of the casting pipe; the regulating valve b11 is in a normally open state, and the opening of the regulating valve b11 is adjusted accordingly according to the liquid magnesium casting speed.

[0014] After the casting of liquid magnesium is completed, the surface of the magnesium ingot solidifies first, and the inside of the magnesium ingot is still in a liquid state. Therefore, it takes a long time for the magnesium ingot to be formed and cooled. During the solidification period, the temperature of the magnesium ingot is still quite high. The magnesium ingot will be oxidized and burned when it contacts the air. The formed magnesium ingot protection tube 12 is welded from a steel pipe. A row of 2mm round holes is evenly distributed every 10mm at the bottom of the formed magnesium ingot protection tube 12 to protect the surface quality of the formed magnesium ingot.

[0015] The working principle of the present invention is as follows: when the mold stops, the mold pre-filling gas pipe a1 and the filling pipe 3 at the bottom of the mold pre-filling gas pipe b2 are extended into the mold through the control system command, and the control system command opens the solenoid valve 6 to replace the air in the mold, thereby reducing the air content in the mold and reducing the combustion of liquid magnesium; when the magnesium liquid starts to be cast, the protective gas is passed through the casting protection nozzles 10 arranged at different angles on the casting protective gas pipe 8 to protect the casting position and the entire casting mold; the protective gas passes through the circular hole at the bottom of the forming magnesium ingot protection tube 12 to protect the casted magnesium ingot.

[0016] 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 novel magnesium ingot casting gas protection device, comprising a mold pre-filling gas pipe a (1), a mold pre-filling gas pipe b (2), a pneumatic component (4), a control system (5), a solenoid valve (6), a casting protection gas pipe (8), a steel plate (9), a casting protection nozzle (10), a regulating valve b (11), a forming magnesium ingot protection pipe (12), a regulating valve c (13) and a protection gas pipeline (14); characterized in that: The mold pre-filling gas tube a (1) and the mold pre-filling gas tube b (2) are connected together, and a gas filling tube (3) is arranged at the bottom thereof, and the gas filling tube (3) is located in the mold; the pneumatic component (4) is arranged at the bottom of the connection between the mold pre-filling gas tube a (1) and the mold pre-filling gas tube b (2), and the mold pre-filling gas tube a (1) and the mold pre-filling gas tube b (2) can move up and down; The solenoid valve (6) is connected to the control system (5) and automatically controlled according to the state of the mold; the pneumatic component (4) and the solenoid valve (6) are controlled by the control system (5), and the regulating valve a (7) is in a normally open state. When the liquid magnesium starts to be cast and the mold is in a stopped state, the control system (5) controls the pneumatic component (4) to operate, and the solenoid valve (6) opens the protective gas to replace the air in the mold; The steel plate (9) is arranged on the casting protection air pipe (8); the casting protection nozzle (10) is arranged on the casting protection air pipe (8), and the installation angle of the casting protection nozzle (10) is adjusted according to the shape and parameters of the mold; the steel plate (9) is welded to the casting protection air pipe (8), and a hole is reserved at the casting pipe position according to the size of the casting pipe; the regulating valve b (11) is in a normally open state, and the opening of the regulating valve b (11) is adjusted accordingly according to the liquid magnesium casting speed; The bottom of the formed magnesium ingot protection tube (12) is provided with a small hole.

2. A novel magnesium ingot casting gas protection device according to claim 1, characterized in that: The casting protection air pipe piece (8) and the casting protection nozzle (10) are connected via threads.

3. A novel magnesium ingot casting gas protection device according to claim 1, characterized in that: A row of 2 mm round holes evenly distributed every 10 mm is arranged at the bottom of the formed magnesium ingot protection tube (12).

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