阅读说明：本技术 一种用于中频炉气体保护和精炼金属液的顶底吹氩系统 (Top-bottom argon blowing system for gas protection and refining of molten metal of intermediate frequency furnace ) 是由 张君 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种用于中频炉气体保护和精炼净化金属液的顶底吹氩系统,在中频炉炉体的底部埋有气体扩散器,气体扩散器之上铺设捣打有一层干振透气料,在中频炉炉体的上方设置有旋流顶吹装置,顶吹装置包括带缺口的圆环状吹气管,缺口位于中频炉炉口出金属液位置上方且缺口处端口封闭,在圆环状吹气管内侧均匀开设有多个喷气孔,多个喷气孔出气方向均向下倾斜且在圆周平面与圆周切线呈锐角朝同一方向倾斜,圆环状吹气管通过连通管、高压气管连接外部氩气源。本发明的顶底吹氩系统,通过底吹、顶吹旋流氩气的配合,使得金属液与空气隔离,更益于金属液脱氢氧、除杂质、合金均化,金属液不易被氧化、不易被二次污染,提高了产品的品质。(The invention discloses a top and bottom argon blowing system for protecting gas of an intermediate frequency furnace and refining and purifying molten metal, wherein a gas diffuser is buried at the bottom of a furnace body of the intermediate frequency furnace, a layer of dry vibration permeable material is laid and tamped on the gas diffuser, a rotational flow top blowing device is arranged above the furnace body of the intermediate frequency furnace and comprises a circular blowing pipe with a notch, the notch is positioned above the molten metal outlet position of a furnace mouth of the intermediate frequency furnace, the port at the notch is closed, a plurality of gas injection holes are uniformly formed in the inner side of the circular blowing pipe, the gas outlet directions of the plurality of gas injection holes are downward inclined, the gas outlet directions of the plurality of gas injection holes are inclined in the same direction in the circumferential plane in an acute angle with the circumferential tangent line, and the circular blowing pipe. According to the top-bottom argon blowing system, the molten metal is isolated from the air through the cooperation of bottom-blowing rotational flow argon and top-blowing rotational flow argon, so that the oxyhydrogen removal, impurity removal and alloy homogenization of the molten metal are facilitated, the molten metal is not easily oxidized and secondarily polluted, and the quality of a product is improved.)

1. The utility model provides a top end argon blowing system that is used for intermediate frequency furnace gas protection and concise purification molten metal, includes the intermediate frequency furnace body, its characterized in that: a gas diffuser is embedded at the bottom of the intermediate frequency furnace body and is connected with an external argon source through a high-pressure gas pipe, a layer of dry vibration permeable material which is in contact with molten metal and serves as a working lining is laid and rammed at the bottom of the intermediate frequency furnace body and above the gas diffuser, a top-blowing device is arranged above the furnace body of the intermediate frequency furnace, the top-blowing device comprises a circular blowing pipe with a notch, the notch of the circular blowing pipe is positioned above the molten metal outlet position of the furnace mouth of the intermediate frequency furnace, the port at the notch is closed, a plurality of air injection holes are uniformly arranged on the inner side of the circular air blowing pipe, the air outlet directions of the air injection holes are all inclined downwards and inclined towards the same direction at an acute angle between the circumferential plane and the circumferential tangent line, thereby form spiral air current in the intermediate frequency furnace body, ring form gas blow pipe one side is connected with high-pressure gas pipe through communicating pipe, and high-pressure gas pipe connects outside argon source.

2. The top and bottom argon blowing system for the gas shield and the refining purification of molten metal of the intermediate frequency furnace as set forth in claim 1, wherein: the gas injection holes form an included angle of 10-90 degrees with the tangent line of the circumference on the circumferential plane.

3. The top and bottom argon blowing system for the gas shield and the refining purification of molten metal of the intermediate frequency furnace as set forth in claim 1, wherein: one side of the circular gas blowing pipe is fixed on a mounting support, the mounting support is movably mounted on a supporting seat on the furnace platform plane of the intermediate frequency furnace, and the mounting support can rotate on the supporting seat and can adjust the height.

4. A top and bottom argon blowing system for intermediate frequency furnace gas shield and refining purified molten metal as claimed in claim 3 wherein: the mounting bracket is inserted on the supporting seat and can rotate around the supporting seat, pin holes are vertically and correspondingly formed in the supporting seat and the connecting portion of the mounting bracket and the supporting seat, and the mounting height of the mounting bracket can be adjusted through the matched pin shaft.

5. The top and bottom argon blowing system for the gas shield and the refining purification of molten metal of the intermediate frequency furnace as set forth in claim 1, wherein: the circular blowing pipe is a stainless steel hollow pipe.

6. A top and bottom argon blowing system for gas shield and refining purified molten metal of an intermediate frequency furnace as claimed in any one of claims 1 to 5, wherein: the gas diffuser and the top-blowing device are respectively and independently connected with an external argon source, and a gas control device for independently controlling the air pressure and flow of the gas blown by the gas diffuser and the top-blowing device is arranged on a communicating pipeline with the external argon source.

Technical Field

The invention relates to the technical field of metallurgical casting and refining molten metal, in particular to a top and bottom argon blowing system for gas protection of an intermediate frequency furnace and refining and purifying molten metal.

Background

With the development of science and technology, the requirement on the material of a casting material is higher and higher. The refining and purification of the molten metal are important means for improving the quality of the molten metal and the quality of castings, and are one of the targets pursued by the casting industry at home and abroad. The smelting equipment that domestic and foreign foundry enterprises adopted mainly is medium frequency induction furnace, and a small amount of foundry enterprises medium frequency induction furnace adopts bottom installation air brick argon blowing to carry out the molten metal refining, and the air brick gas production is big to cause the refining effect not good, and the air brick is direct to be easily blockked up the melting loss with the molten metal contact and leads to the life weak point, and the molten metal surface is naked to leak and contacts with the atmosphere in the medium frequency furnace, leads to the secondary oxidation of molten metal, influences the refining effect and the quality of molten metal, causes alloy yield reduction scheduling shortcoming of molten metal.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a top-bottom argon blowing system for protecting gas of an intermediate frequency furnace and refining and purifying molten metal, wherein argon is blown into the bottom of the intermediate frequency furnace, so that oxyhydrogen and impurities are removed from the molten metal in the intermediate frequency furnace, an alloy is homogenized, a spiral argon flow is blown into the top of the intermediate frequency furnace, so that the molten metal in the intermediate frequency furnace is sealed and isolated from air, a hearth is filled with argon, and meanwhile, after impurities and volatile matters in the molten metal are adsorbed onto the surface of the molten metal by the bottom-blown argon, negative pressure is formed on the surface of the molten metal under the action of the spiral argon flow, the molten metal is easily discharged out of a furnace chamber of the intermediate frequency furnace to form a similar vacuum induction furnace, the molten metal is not easily oxidized and is not easily polluted.

The technical scheme adopted by the invention is as follows: a top-bottom argon blowing system for gas protection and refining purification of molten metal of an intermediate frequency furnace comprises an intermediate frequency furnace body, wherein a gas diffuser is buried at the bottom of the intermediate frequency furnace body, the gas diffuser is connected with an external argon gas source through a high-pressure gas pipe, a dry vibration gas permeable material which is used as a working lining by ramming one layer and is in contact with the molten metal is laid on the bottom of the intermediate frequency furnace body and the gas diffuser, a top blowing device is arranged above the intermediate frequency furnace body and comprises a circular blowing pipe with a notch, the notch of the circular blowing pipe is positioned above a molten metal outlet position of an intermediate frequency furnace mouth, the port of the notch is sealed, a plurality of gas injection holes are uniformly arranged on the inner side of the circular blowing pipe, the gas outlet directions of the plurality of gas injection holes are all downwards inclined downwards and are inclined towards the same direction at an acute angle with a circumferential tangent line, so that a spiral gas, one side of the circular blowing pipe is connected with a high-pressure air pipe through a communicating pipe, and the high-pressure air pipe is connected with an external argon source.

Furthermore, the gas injection holes form an included angle of 10-90 degrees with a circumferential tangent line on a circumferential plane, and the included angle is adjusted according to the size of the intermediate frequency furnace body.

Furthermore, one side of the circular blowing pipe is fixed on a mounting bracket, the mounting bracket is movably mounted on a supporting seat positioned on the furnace platform plane of the intermediate frequency furnace, and the mounting bracket can rotate on the supporting seat and can adjust the height.

Further, the mounting bracket is inserted on the supporting seat and can rotate around the supporting seat, pin holes are vertically and correspondingly formed in the supporting seat and the connecting portion of the mounting bracket and the supporting seat, and the mounting height of the mounting bracket can be adjusted through the matched pin shaft.

Furthermore, the circular blowing pipe is a stainless steel hollow pipe.

Furthermore, the gas diffuser and the top-blowing device are respectively and independently connected with an external argon gas source, and a gas control device for independently controlling the gas pressure and flow of the gas blown by the gas diffuser and the top-blowing device is arranged on a communicating pipeline with the external argon gas source.

The invention has the beneficial effects that:

(1) by adopting the top-bottom argon blowing system, the air in the furnace cavity of the intermediate frequency furnace can be fully discharged by the argon through the matching of bottom blowing and top blowing of the argon, the molten metal is under the comprehensive protection of the argon atmosphere, and the molten metal is not easily oxidized and is not easily secondarily polluted like a vacuum furnace; the coordination of bottom blowing and top blowing argon is more beneficial to oxyhydrogen removal, impurity removal and alloy homogenization of the molten metal, so that the quality of the molten metal is improved;

(2) by arranging the gas injection holes which are inclined downwards and inclined towards the same direction at acute angles between the circumferential plane and the circumferential tangent, spiral gas flow can be formed in the intermediate frequency furnace chamber, and under the action of rotational flow gas, the surface of molten metal in the furnace chamber forms negative pressure, so that argon is blown from the bottom to adsorb impurity gas and volatile matters in the molten metal to the surface of the molten metal and discharge the metal to the intermediate frequency furnace chamber, and the phenomenon that the concentration of the impurity gas or volatile matters on the surface of the molten metal is too high and the molten metal is polluted due to backflow caused by the space limitation of the intermediate frequency furnace chamber is;

(3) the top gas blowing pipe is rotatably connected with the supporting seat through the mounting bracket, the height of the gas blowing pipe can be adjusted, the operation is convenient, and the influence on the use of working conditions of feeding, molten steel discharging and the like of the intermediate frequency furnace can be avoided.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

FIG. 2 is a schematic top view of the top-blowing apparatus of the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.

As shown in fig. 1 and fig. 2, the top-bottom argon blowing system for gas protection and refining purification of molten metal in an intermediate frequency furnace of the present embodiment includes an intermediate frequency furnace body 1, a gas diffuser 3 is buried in the bottom of the intermediate frequency furnace body 1, the gas diffuser 3 is connected to a gas source 5 through a high pressure gas pipe 4, a layer of dry vibration permeable material 2 is laid and rammed on the gas diffuser 3 at the bottom of the intermediate frequency furnace body 1, the gas diffuser 3 is protected, and the service life of a furnace lining is prolonged and synchronized; a top blowing device is arranged above the furnace body 1 of the intermediate frequency furnace, the top blowing device comprises a circular blowing pipe 7 with a gap, the blowing pipe 7 is a stainless steel hollow pipe, the gap of the circular blowing pipe 7 is positioned above the furnace opening of the intermediate frequency furnace, and the port at the gap is closed, a plurality of gas injection holes are uniformly arranged on the inner side of the circular gas injection pipe 7, the gas outlet directions of the plurality of gas injection holes are all inclined downwards, and the gas injection holes are inclined towards the same direction at an included angle of 10-90 degrees between a circumferential plane and a circumferential tangent (the gas injection direction is shown by an arrow in the drawing), the included angle is adjusted according to the size of the intermediate frequency furnace body, thereby form the spiral air current in the intermediate frequency furnace chamber, receive the whirl effect to more be favorable to the bottom blowing argon gas to adsorb the discharge of the gaseous impurity and the volatile matter on molten metal surface, avoid taking place the backward flow to recontaminate the molten metal phenomenon because of molten metal surface gaseous impurity or volatile matter concentration is too high. One side of the air blowing pipe 7 is connected with the high-pressure air pipe 4 through a communicating pipe, and the high-pressure air pipe 4 is connected with the air source 5. One side of the gas blowing pipe 7 is fixed on a mounting bracket 8, the mounting bracket 8 is inserted and mounted on a supporting seat 9 positioned on the furnace table surface of the intermediate frequency furnace and can rotate around the supporting seat 9, when molten metal is smelted in the intermediate frequency furnace, the circular gas blowing pipe 7 rotates to the position above the molten steel surface through the supporting seat to carry out rotational flow argon blowing protection, and when furnace burden is added into the intermediate frequency furnace or the molten metal is poured out, the gas blowing pipe 7 rotates to the idle position of the furnace table surface through the supporting seat; the supporting seat 9 and the connecting part of the mounting bracket 8 and the supporting seat 9 are vertically provided with corresponding pin holes, and the mounting height of the mounting bracket 8 can be adjusted by matching with a pin shaft, so that the gas blowing pipe 7 is at an applicable height.

The gas diffuser 3 and the top blowing device are independently connected with a gas source 5, and a gas control device 6 for independently controlling the gas pressure and flow of the gas blown by the gas diffuser 3 and the top blowing device is arranged on a communicating pipeline with the gas source 5.

By adopting the top-bottom argon blowing system, the air in the furnace cavity of the intermediate frequency furnace can be fully discharged by the argon through the matching of bottom blowing and top blowing rotational flow argon, the molten metal is under the comprehensive protection of argon atmosphere, and the molten metal is not easily oxidized and secondarily polluted like a vacuum furnace, so that the oxyhydrogen removal, impurity removal and alloy homogenization of the argon blown into the molten metal from the bottom are facilitated, and the quality of the molten metal is improved; through the adjustment of the opening direction of the gas injection holes on the circular gas injection pipe, spiral gas flow can be formed in the furnace chamber of the intermediate frequency furnace, and under the action of rotational flow argon, the surface of molten metal in the furnace chamber forms negative pressure, so that the bottom blowing argon is more favorable for adsorbing impurity gas and volatile matters in the molten metal to the surface of the molten metal and discharging the metal out of the furnace chamber of the intermediate frequency furnace, and the phenomenon that the metal is polluted by backflow due to overhigh concentration of the impurity gas or volatile matters on the surface of the molten metal caused by the space limitation of the furnace chamber of; the top gas blowing pipe is rotatably connected with the supporting seat through the mounting bracket, the height of the gas blowing pipe can be adjusted, the operation is convenient, and the influence on the normal use of the intermediate frequency furnace can be avoided.

Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.