阅读说明：本技术 一种新型镁锭铸造气体保护装置 (Novel magnesium ingot casting gas protection device ) 是由 周茂敬 巨克珺 刘应宝 于 2020-04-01 设计创作，主要内容包括：本发明涉及一种镁锭铸造气体保护装置,包括模具预充气体管a、模具预充气体管b、充气管、气动组件、控制系统、电磁阀、调节阀a、铸造保护气管件、钢板、铸造保护喷嘴、调节阀b、成形镁锭保护管、调节阀c和保护气体管道；在镁锭浇铸开始前及开始浇铸作业时通过对调节阀、电磁阀及喷嘴的控制,解决镁锭浇铸时镁锭表面燃烧,造成镁锭质量不合格等问题。(The invention relates to a magnesium ingot casting gas protection device, which comprises a mould pre-charging gas pipe a, a mould pre-charging gas pipe b, a gas charging pipe, a pneumatic assembly, a control system, an electromagnetic valve, an adjusting valve a, a casting protection gas pipe fitting, a steel plate, a casting protection nozzle, an adjusting valve b, a formed magnesium ingot protection pipe, an adjusting valve c and a protection gas pipeline; the problems of unqualified magnesium ingot quality and the like caused by surface combustion of the magnesium ingot during casting of the magnesium ingot are solved by controlling the regulating valve, the electromagnetic valve and the nozzle before the casting of the magnesium ingot and during the casting operation.)

1. A novel magnesium ingot casting gas protection device comprises a mold pre-charging gas pipe a1, a mold pre-charging gas pipe b2, a pneumatic assembly 4, a control system 5, an electromagnetic valve 6, a casting protection gas pipe fitting 8, a steel plate 9, a casting protection nozzle 10, a forming magnesium ingot protection pipe 12 and a protection gas pipeline 14; the pre-charging gas pipe a1 and the mould pre-charging gas pipe b2 are connected together, and the bottom of the pre-charging gas pipe a1 and the mould pre-charging gas pipe b2 is provided with an inflation pipe 3; the pneumatic assembly 4 is arranged at the bottom of the joint of the pre-charging gas pipe a1 and the mold pre-charging gas pipe b2, and the mold pre-charging gas pipe a and the mold pre-charging gas pipe b can move up and down; a steel plate 9 is arranged on the casting protection gas pipe fitting 8; the casting protection nozzle 10 is arranged on the casting protection gas pipe fitting 8, and the bottom of the formed magnesium ingot protection pipe is provided with a small hole.

2. The novel magnesium ingot casting gas shield device of claim 1, wherein: the electromagnetic valve 6 is connected with the control system 5 and can be automatically controlled according to the state of the die.

3. The novel magnesium ingot casting gas shield device of claim 1, wherein: the casting shielding gas pipe 8 and the casting shielding nozzle 10 are connected by a screw thread.

4. The novel magnesium ingot casting gas shield device of claim 1, wherein: a row of round holes with the diameter of 2mm are uniformly distributed at the bottom of the formed magnesium ingot protection tube 12 every 10 mm.

Technical Field

The invention belongs to a protection device during liquid magnesium casting, and particularly relates to a novel magnesium ingot casting gas protection device.

Background

As a green and environment-friendly material, magnesium is finally extracted from a refining furnace or other equipment after being refined and then is timely conveyed into a mould of a casting system to form a magnesium ingot finished product. The temperature of liquid magnesium is 680-700 ℃ when the magnesium ingot is cast, the high-temperature molten liquid magnesium is conveyed into a die through a casting pipe and can be violently combusted in an unprotected state, the surface of the magnesium ingot is protected by spreading sulfur powder and igniting gas generated by the sulfur powder during the casting of the magnesium ingot, and when the surface of the magnesium ingot is combusted, the sulfur powder cannot be effectively protected, a combustion layer on the surface of the magnesium ingot must be scraped. However, because the magnesium ingot is not fully protected when the magnesium ingot is cast or cast, the magnesium ingot can be burnt and oxidized on the surface, and the cast magnesium ingot can only be re-melted and re-cast, so that the workload is very large, the sulfur powder is scattered and burnt to generate gas protection to cause environmental pollution, and the severe casting environment can cause damage to the bodies of operators due to long-time use of the sulfur powder.

Disclosure of Invention

The invention aims to provide a novel magnesium ingot casting gas protection device, which solves the problem of combustion on the surface of a magnesium ingot during magnesium liquid casting, ensures the overall quality of the magnesium ingot, reduces the remelting work of unqualified magnesium ingots, reduces the workload of workers, reduces the pollution to the environment and improves the working environment of the operators.

The technical scheme adopted by the invention for solving the technical problems is as follows: the magnesium ingot casting gas protection device comprises a mold pre-charging gas pipe a, a mold pre-charging gas pipe b, a gas-filled pipe, a pneumatic assembly, a control system, an electromagnetic valve, an adjusting valve a, a casting protection gas pipe fitting, a steel plate, a casting protection nozzle, an adjusting valve b, a formed magnesium ingot protection pipe, an adjusting valve c and a protection gas pipeline; the mold pre-charging gas pipe a and the mold pre-charging gas pipe b are connected together, and when casting is started, the electromagnetic valve and the pneumatic component are controlled through instructions of a control system according to the state of the mold, and the mold pre-charging gas pipe a and the mold pre-charging gas pipe b can move up and down; the casting protection gas pipe fitting, the casting protection nozzle and the regulating valve b prevent the liquid magnesium from burning when the liquid magnesium starts to be cast; the steel plate is arranged on a casting protective gas pipe fitting, and the formed magnesium ingot protection pipe and the regulating valve c protect the fast-formed magnesium ingot from being burnt.

The invention has the following beneficial effects: (1) the air in the pre-casting mold is replaced through the mold pre-charging gas pipe a, the mold pre-charging gas pipe b, the electromagnetic valve, the regulating valve a, the pneumatic assembly and the control system, so that the air content in the mold is reduced, and the combustion of liquid magnesium is reduced. (2) The gas quantity of the protective gas is adjusted through the adjusting valve b, and the protective gas protects all directions when the liquid magnesium is cast through the casting protective gas pipe fitting and the casting protective nozzle, so that the liquid magnesium is prevented from burning during casting. (3) And adjusting the gas amount of the protective gas through an adjusting valve b, wherein the protective gas is protected by a formed magnesium ingot protection pipe to protect the unfinished and formed magnesium ingot. Preventing the surface of the magnesium ingot from burning and oxidizing.

Drawings

FIG. 1 is a schematic structural diagram of a novel magnesium ingot casting gas protection device in a front view.

FIG. 2 is a schematic top view of a novel magnesium ingot casting gas shield apparatus according to the present invention.

The notation in the figures means: the method comprises the following steps of 1-a mould pre-charging gas pipe a, 2-a mould pre-charging gas pipe b, 3-an inflation pipe, 4-a pneumatic assembly, 5-a control system, 6-an electromagnetic valve, 7-an adjusting valve a, 8-a casting protective gas pipe fitting, 9-a steel plate, 10-a casting protective nozzle, 11-an adjusting valve b, 12-a forming magnesium ingot protection pipe, 13-an adjusting valve c and 14-a protective gas supply pipeline.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings. Elements and features depicted in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that the figures and description omit representation and description of components and processes that are not relevant to the present invention and that are known to those of ordinary skill in the art for the sake of clarity.

As shown in fig. 1 and 2, the novel magnesium ingot casting gas protection device comprises a mold pre-charging gas pipe a1, a mold pre-charging gas pipe b2, a gas charging pipe 3, a pneumatic assembly 4, a control system 5, a solenoid valve 6, an adjusting valve a7, a casting protection gas pipe fitting 8, a steel plate 9, a casting protection nozzle 10, an adjusting valve b11, a formed magnesium ingot protection pipe 12, an adjusting valve c13 and a protection gas supply pipeline 14.

The bottom of a mold pre-charging gas pipe a1 and a mold pre-charging gas pipe b2 are welded with a gas filling pipe 3 to a distance of 20mm from the bottom of a mold, a pneumatic assembly 4 is installed at the bottom of the joint of the mold pre-charging gas pipe a1 and the mold pre-charging gas pipe b2, the pneumatic assembly 4 and an electromagnetic valve 6 are controlled by a control system 5, an adjusting valve a7 is in a normally open state, when liquid magnesium starts to cast the mold in a stop state, the control system 5 controls the pneumatic assembly 4 to act, the gas filling pipe 3 welded at the bottom of the mold pre-charging gas pipe a1 and the bottom of the mold pre-charging gas pipe b2 is positioned in the mold, and the electromagnetic valve 6 opens protective gas to replace air in the mold.

The casting protective gas pipe fitting 8 is formed by welding steel pipes, the casting protective nozzle 10 is in threaded connection with the casting protective gas pipe fitting 8, the installation angle of the casting protective nozzle 10 is adjusted according to the shape and parameters of the mould, but the gas protection must be ensured in the casting mould, particularly the liquid magnesium outflow position of the casting pipe; the steel plate 9 is welded on the casting protective gas pipe fitting 8, and a hole is reserved at the position of the casting pipe according to the size of the casting pipe; the regulating valve b11 is in a normally open state, and the opening degree of the regulating valve b11 is correspondingly regulated according to the liquid magnesium casting speed.

After the liquid magnesium is cast, the surface of the magnesium ingot is firstly solidified, the inside of the magnesium ingot is still in a liquid state, so that the forming and cooling of the magnesium ingot needs a long time, the temperature of the magnesium ingot is still quite high during the forming and solidifying period, and the surface oxidation and combustion can be caused when the magnesium ingot is in contact with air. The formed magnesium ingot protection pipe 13 is formed by welding steel pipes, and a row of round holes of 2mm are uniformly distributed at the bottom of the formed magnesium ingot protection pipe 13 every 10mm and used for protecting the surface quality of the formed magnesium ingot.

The working principle of the invention is as follows: when the mold stops, the gas filling pipe 3 at the bottom of the mold pre-filling gas pipe a1 and the mold pre-filling gas pipe b2 extends into the mold through a control system instruction, and the control system instruction opens the electromagnetic valve 6 to replace the air in the mold, so that the air content in the mold is reduced, and the combustion of liquid magnesium is reduced; when the magnesium liquid starts to be cast, the protective gas protects the casting position and the whole casting mould through casting protective nozzles 10 arranged on a casting protective gas pipe fitting 8 at different angles; the protective gas protects the cast magnesium ingot through a round hole at the bottom of the formed magnesium ingot protection pipe 13.