JPH079040Y2 - Electromagnetic stirring mechanism of molten metal in molten metal holding tank - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a holding tank of a type such as a reverberatory furnace in which a metal is melted and held, and an inductor is arranged outside the side wall of the furnace. The present invention relates to an electromagnetic stirring mechanism having a slope on a protruding furnace wall for applying a moving magnetic field to the molten metal in the holding tank to convert the molten metal from the lower layer to the upper layer or from the upper layer to the lower layer.

[Prior Art] In a melting chamber or holding tank that melts and holds a molten metal in a conventional reverberatory furnace, an inductor for generating a moving magnetic field is arranged immediately below the bottom of the holding tank, and an induced current is generated in the molten metal. The molten metal is moved in the direction of the moving magnetic field by the thrust of the molten metal due to the interaction with the molten metal, whereby the molten metal in the furnace is stirred accurately and the molten metal temperature is made uniform.

However, in order to place the inductor just below the furnace bottom,
Construction to form a pit to provide a space for accommodating the inductor, a mechanism for maintaining and inspecting the inductor provided in the pit below the furnace body, and man-hours and costs for the inspection will significantly increase. .

Therefore, as a means for coping with such a difficulty, a structure in which an inductor is arranged on the side surface of the furnace to generate a horizontal flow of molten metal is considered.

[Problems to be Solved by the Invention] However, when an inductor is placed on the side of the furnace to stir the molten metal as described above, the molten metal in the furnace has a plurality of horizontal layers from the upper layer to the lower layer. There was a tendency that a flow was formed and it became difficult to exchange between the upper and lower layers of the molten metal, and as a result, the temperature and components of the molten metal in the furnace could not be made uniform.

[Means for Solving the Problems] The inductor is arranged close to the outside of the side wall of the molten metal holding tank so that the molten metal flows horizontally in the furnace by the moving magnetic field of the inductor. The side wall of the furnace body on the arranged side is made thicker than the other side walls, and the molten metal that is fluidly circulated by the moving magnetic field on its inner surface is forcibly formed, and the lower layer portion than the upper layer portion
Alternatively, an inclined surface that serves as a guide surface leading from the lower layer portion to the upper layer portion was constructed and the molten metal in the upper layer portion and the lower layer portion were exchanged with each other to make the temperature and components of the molten metal in the holding tank uniform.

The inclined surface for guiding the molten metal is formed on the inner surface of the side wall of the furnace body as described below.

In the following description, in order to facilitate understanding, expressions such as "a part of the side wall is cut away and left on the remaining part" are used. Rather than scraping it off, if it is scraped off, only the parts that should remain after that should be piled up with a predetermined thickness of refractory bricks and the like and built.

A) Slope that guides the molten metal from the lower layer to the upper layer. It is a side view and remains when the upper half ECDF corresponding to about half of the side wall area shown by the quadrilateral ABCD in Fig. 7 (A) is cut out. Form the slope indicated by the hypotenuse EF of the trapezoid ABEF. When the molten metal receiving thrust in the X direction hits this, the molten metal is guided along the slope EF against the gravity of the molten metal at that position and flows from the lower layer to the upper layer.

(B) Slope that guides the molten metal from the upper layer to the lower layer. In the side view, the lower half E'CDF 'corresponding to about 1/2 of the side wall area shown by the quadrilateral ABCD in Fig. 7 (B) is cut out. In this case, a slope indicated by the hypotenuse E'F 'on the lower side of the trapezoid ABE'F' that remains is formed. When the molten metal receiving thrust in the X'direction hits this slope, the molten metal cannot flow horizontally as it is, but flows from the upper layer to the lower layer along the slope E'F '.

[Operation] The molten metal that flows against the inclined surface due to the moving magnetic field of the inductor flows from the lower part of the molten metal in the furnace to the upper part (or vice versa) by the thrust provided by the inductor, and the molten metal between the upper and lower layers is separated. It mixes well and the temperature and ingredients are uniform.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1, FIG. 2 and FIG. 3 show that inside the side wall along the longitudinal axis of the molten metal layer in the first embodiment, the inside of the furnace wall where the electromagnetic stirring inductor is placed in contact with the outside. FIG. 4 is a diagram showing a case where an inclined surface forming an upward slope is formed from the bottom of the furnace to the upper surface of the side wall, and the molten metal flowing in the lower layer of the molten metal is caused to flow upward along the inclined surface.

4, 5 and 6 show a second embodiment, in which a part of the inner wall surface of the side wall on which the inductor is installed is cut out,
The lower surface forms an inclined surface that descends from the upper part of the furnace wall toward the furnace bottom, and it looks like a lower plate surface of stairs inside a building or a lower slope of an internal escalator such as a building. Since the molten metal flows under the thrust of the moving magnetic field given by the inductor, it flows from the upper layer to the lower layer along the slope near the slope.

Throughout the first and second embodiments, members common to the first embodiment are designated by the same reference numerals, and members having similar functions are indicated by adding a dash to the numeral.

FIG. 1 is a plan sectional view showing a first embodiment of the present invention. Reference numeral 10 shows the whole reverberatory furnace according to the present invention, 11 is a molten metal holding tank, 12 and 12 'are longitudinal side walls, Reference numerals 13 and 13 'are side walls on the short side.

One of a pair of opposed longitudinal side walls 12, 12 ', which is in contact with the outside of the lower side wall 12' in FIG.
Is installed.

The lower side wall 12 ′ is thicker than the other side walls 12, and only the thickened part forms a narrow slope 16 that inclines upward from the furnace bottom toward the upper end of the side wall. And is cut out.

2 and 3 show the arrows II-II and III-III in FIG. 1, respectively.
17 is a side sectional view taken along the line 17 shows the molten metal. As can be seen from these drawings, the slope 16 formed on the side wall 12 ′ is
Since a kind of slope that rises from the right side to the upper left side is formed, if the direction of the moving magnetic field by the inductor is arrow A, the molten metal flows and circulates in the melting chamber in the direction of arrow A ', At 16, the person is forced to flow upward as it goes up a slope, the lower molten metal is pushed to the upper layer, and the molten metal already in the upper layer is sequentially pushed to the lower layer, and the molten metal in the upper layer and the molten metal in the lower layer. Exchange between them is realized and the temperature distribution in the molten metal becomes uniform.

FIG. 4 is a plan sectional view showing a second embodiment of the present invention. Reference numeral 10 shows the entire reverberatory furnace according to the present invention, 11 is a melting chamber, and 12 and 12 'are longitudinal side walls. 13 is the short side wall.

One of a pair of opposing longitudinal side walls 12, 12 ', which is in contact with the outside of the lower side wall 12' in FIG.
Is installed.

The side wall 12 'is made thicker than the other side walls 12, and is cut so as to form a narrow slope 16' which is inclined downward from the upper part of the furnace toward the lower end of the side wall by the increased thickness. Missing.

5 and 6 show the arrows V-VC and VI in FIG. 4, respectively.
In the side sectional view taken along line -VI, 17 shows the molten metal.

As can be seen from these drawings, the slope 16 ′ formed on the side wall 12 ′ descends toward the bottom of the furnace from the position on the right side of the side wall 12 ′ toward the bottom of the furnace to the lower slope of the escalator inside the building or the like. Since a similar slope is formed, if the direction of the moving magnetic field by the inductor is arrow A, the molten metal flows and circulates in the melting chamber in the direction of arrow A'to reach the slope 16 ', and the air in the building is exactly reached. Is forced to flow downwards so that it flows along the lower slope of the escalator.

The aspect of the flow given to the molten metal 17 by the inclined surface 16 'is different only in that it is directed upward or downward, and a further description will be omitted.

[Effect] To avoid cost increase for pit formation work that is indispensable when arranging inductors below the bottom of the furnace, and maintenance and inspection mechanism of the inductors installed in the pit below the furnace body and inspection. Even if the inductor is placed on the outside of the side wall of the furnace, the disadvantage of the lateral arrangement was that the molten metal became laminar and the temperature and components became non-uniform, but these problems were resolved and smoothed. Uniformity of temperature and components is achieved by vigorous flow and stirring.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.
The figure is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is the line III-III in FIG.
FIG. 4 is a side sectional view, FIG. 4 is a plan view showing a second embodiment of the present invention, FIG. 5 is a sectional side view taken along line VV of FIG. 4, and FIG.
FIGS. 7 (A) and 7 (B) are sectional views taken along the line VI-VI in the figure, and are schematic views showing a method of constructing two kinds of slopes on the side wall of the furnace. Reference numeral 10 in the drawing: Reverberatory furnace, 11: Molten metal holding tank, 12, 12 ': Long side wall, 13,
13 ': short side wall, 14: furnace bottom, 15: inductor, 16,16': inclined surface, 17: molten metal.

Claims (3)

[Scope of utility model registration request] 1. A reverberatory furnace having a molten metal holding tank for melting a metal, an alloy, etc. and holding a molten metal, and an inductor installed near the outside of one side wall for electromagnetic stirring of the molten metal. In an electromagnetic stirring mechanism for molten metal in a metallurgical furnace, a part of the inside of the side wall where the inductor of the molten metal holding tank is installed is cut out obliquely, and the upper or lower side of the side wall formed in a protruding state Each of which has a slope formed on its surface, each of which faces the molten metal flowing by the moving magnetic field generated by the inductor, and flows the molten metal in the holding tank from the lower layer to the upper layer or from the upper layer to the lower layer. Electromagnetic stirring mechanism for molten metal in a molten metal holding tank, characterized by converting 2. The inclined surface for changing the direction of flow is formed as an upper inclined surface that remains when substantially the upper half of the inner side wall on the side where the inductor is installed is cut out obliquely. The electromagnetic stirring mechanism of the molten metal in the molten metal holding tank according to claim 1, wherein the flow direction of the molten metal is changed from the lower layer to the upper layer. 3. The slope for changing the direction of the flow is formed as a slope on the lower side of a portion which remains when the lower half of the inside of the side wall on which the inductor is installed is cut out obliquely. The electromagnetic stirring mechanism for a molten metal in a molten metal holding tank according to claim 1, wherein the flow direction of the molten metal is changed from an upper layer to a lower layer.