JP5520467B2 - Non-ferrous metal melting furnace - Google Patents

Description

  The present invention relates to a non-ferrous metal melting furnace for melting a non-ferrous metal such as an aluminum alloy to be used for manufacturing various cast products.

Since non-ferrous metals such as aluminum alloys have much lower energy for remelting than energy for smelting ore, recycling so-called scrap is very beneficial, so it is actively recycled. It has been broken.
Conventionally, for such re-melting, a non-ferrous metal melting furnace 10 for circulating a molten metal Y obtained by melting non-ferrous metal as shown in FIG. 5 is used (for example, see Patent Document 1).
Japanese Patent No. 2554510

Such a non-ferrous metal melting furnace 10 includes a temperature raising chamber 11, a vortex chamber 12, a melting chamber 13, and a hot water chamber 15, and the molten metal Y circulates through each chamber.
The temperature raising chamber 11 is a chamber for heating the molten metal Y with a burner to raise and keep the temperature.
The vortex chamber 12 is a chamber for introducing a nonferrous metal into the molten metal Y supplied from the temperature raising chamber 11 and mixing the nonferrous metal with the molten metal Y.
The melting chamber 13 is a chamber for melting the nonferrous metal in the molten metal Y supplied from the vortex chamber 12 by the heat of the molten metal Y.
The hot water supply room 15 is a room for taking out the molten metal Y to the outside.

Here, since the nonferrous metal to be melted is scrap, foreign substances are often attached. Therefore, the molten metal Y in which the nonferrous metal is dissolved contains foreign matters. Moreover, since the surface of the molten metal Y is in contact with air, the non-ferrous metal oxide is generated on the molten metal Y surface by heating the molten metal Y.
When impurities including these oxides and foreign substances flow into the temperature raising chamber 11, the impurities become thermal resistance, which leads to a decrease in melting efficiency. Further, the purity of the target non-ferrous metal is reduced by the amount of impurities in the molten metal Y.

Therefore, a nonferrous metal melting furnace 10 having a removal chamber 14 as shown in FIG. 6 has been proposed.
The removal chamber 14 is a chamber for removing impurities present in the molten metal Y supplied from the melting chamber 13. The removal method is a filtration method, and the filter removal chamber 14 is provided with a filter F.

In this filtration type degreasing method, if the mesh of the filter F is made too small in order to remove fine impurities, clogging on the surface of the filter F occurs in a short period of time when there are many impurities. In this case, if the filter F is not replaced, the molten metal Y itself cannot pass through the filter F due to the clogging. Further, it is desirable to frequently replace the filter F from the viewpoint of cost and work efficiency.
On the other hand, when the mesh of the filter F is enlarged, fine impurities pass through the filter F and flow into the temperature raising chamber 11, so that the effect of the filter F is low.

  Thus, since removal of impurities by filtration is insufficient, a method of scrubbing impurities floating in the removal chamber 14 artificially or mechanically is used in combination.

  However, since impurities are diffused in the molten metal Y, the removal efficiency of the method of boiling impurities is poor.

  Accordingly, an object of the present invention is to provide a non-ferrous metal melting furnace with improved impurity removal efficiency.

In order to achieve the above object, a non-ferrous metal melting furnace (20) according to claim 1 of the present invention comprises a heating chamber (11) for heating and maintaining a temperature of a molten metal (Y), and a heating chamber (11). ) The vortex chamber (12) in which the nonferrous metal is introduced into the molten metal (Y) supplied from) and the nonferrous metal in the molten metal (Y) supplied from the vortex chamber (12) are melted by the heat of the molten metal (Y). A melting chamber (23) and a removal chamber that removes impurities present in the molten metal (Y) supplied from the melting chamber (23) and supplies a part of the molten metal (Y) to the heating chamber (11) ( 14) and a non-ferrous metal melting furnace (20) provided with a hot water chamber (15) for taking out the molten metal (Y) to the outside, the shape in the removal chamber (14) is a plane rectangular shape, and the melting chamber ( 23), the width of the flow path (23a) for supplying the molten metal (Y) from the removal chamber (14) to the melting chamber (23). Said that the flow rate Quicken stop (S) part of the skimming chamber (14) gradually narrows toward the side molten metal (Y), and connected to one corner side of the skimming chamber (14) from Features.

Moreover, the nonferrous metal melting furnace (20) of Claim 2 arrange | positions the said restriction | limiting (S) and the rectification | straightening block (B) by the side of the said removal chamber (14) of the said flow path (23a). It is formed.

Further, non-ferrous metal melting furnace according to claim 3 (20), said rectifying block (B) is characterized by exposed above the surface of the molten metal (Y).

Further, non-ferrous metal melting furnace according to claim 4 (20), said rectifying block (B) is a substantially right-angled triangular cross-section, wherein by utilizing the hypotenuse of the substantially right-angled triangle the flow path (23a) the and forming the dissolution chamber (23) from said Jokasushitsu (14) side toward gradually narrow to stop the (S).

  Here, the symbols in the parentheses indicate corresponding elements or corresponding matters described in the drawings and the best mode for carrying out the invention described later.

  According to the non-ferrous metal melting furnace according to claim 1 of the present invention, the molten metal is formed by forming a throttle for reducing the width of the flow channel on the side of the flow removal chamber of the flow channel for supplying the molten metal from the melting chamber to the removal chamber. As the flow velocity of the vortex is increased, vortices are stably generated in the removal chamber, and impurities collect in the center of the vortex. Therefore, the removal efficiency is good.

Moreover, according to the non-ferrous metal melting furnace of claim 2 , in addition to the effect of the invention of claim 1 , the throttle is formed by arranging a rectifying block on the side of the removal chamber of the flow path. A throttle can also be formed for existing non-ferrous metal melting furnaces. Therefore, even if it is an existing non-ferrous metal melting furnace, the removal efficiency of impurities can be increased.

Moreover, according to the non-ferrous metal melting furnace of claim 3 , in addition to the function and effect of the invention of claim 2 , the rectifying block is exposed above the surface of the molten metal. There is no turbulence in the flow of molten metal. Therefore, the location where the vortex is generated becomes more stable, so that the impurities collected at the center of the vortex will not diffuse again.

Further, according to the non-ferrous metal melting furnace described in claim 4 , in addition to the function and effect of the invention described in claim 2 or 3 , the rectifying block has a substantially right triangle and a hypotenuse of the substantially right triangle. Utilizing this, the flow path is gradually narrowed from the dissolution chamber toward the removal chamber to form a throttle, so that vortices are generated more stably in the removal chamber. In other words, if the wide flow path is narrowed suddenly, the flow of the molten metal is disturbed, and the location of the vortex generated in the removal chamber changes, so the impurities gathered in one place diffuse, but the flow path is gradually If narrow, the flow becomes stable and the collected impurities do not diffuse again. Therefore, the removal efficiency is good.

  Note that, as in the non-ferrous metal melting furnace of the present invention, it is difficult to allow impurities to flow into the heating chamber by forming a throttle that reduces the width of the flow path and increasing the flow rate of the molten metal. It is not described at all.

(First embodiment)
With reference to FIG.1 and FIG.2, the nonferrous metal melting furnace 20 which concerns on 1st embodiment of this invention is demonstrated. FIG. 1 is a plan view showing a non-ferrous metal melting furnace 20 according to the first embodiment of the present invention. FIG. 2 is an enlarged perspective view showing the rectifying block B in the nonferrous metal melting furnace 20 of FIG.

  This non-ferrous metal melting furnace 20 is for melting non-ferrous metals such as aluminum alloys so as to produce various cast products, and mainly includes a temperature raising chamber 11, a vortex chamber 12, a melting chamber 23, and a removal chamber. The chamber 14 and the hot water supply chamber 15 are provided, and the molten metal Y is circulated to each chamber. And it has the characteristics in the flow path 23a which connects the dissolution chamber 23 and the removal chamber 14.

The temperature raising chamber 11 is a chamber that heats and maintains the temperature of the molten metal Y obtained by melting the target non-ferrous metal with a burner.
The molten metal Y is supplied to the vortex chamber 12 by a pump P disposed on the vortex chamber 12 side of the temperature raising chamber 11.
Although heating to the molten metal Y is performed only in the temperature raising chamber 11, the molten metal Y is provided with a sufficient amount of heat in the temperature raising chamber 11, and the non-ferrous metal melting furnace itself has a heat retaining property. There is no loss of heat while circulating through each room.

The vortex chamber 12 is a chamber in which a non-ferrous metal is introduced into the molten metal Y supplied from the temperature raising chamber 11 by the pump P.
The vortex chamber 12 has a funnel shape, and when the molten metal Y flows from the top to the bottom in the vortex chamber 12, a vortex of the molten metal Y is generated, so that the introduced nonferrous metal quickly enters the molten metal Y. scatter.
Here, if non-ferrous metal scrap is put into the molten metal Y as a lump, it takes time until the non-ferrous metal is completely melted in the subsequent process. Then, the crushed chips are put into the molten metal Y.

The melting chamber 23 is a chamber for melting the non-ferrous metal in the molten metal Y supplied from the vortex chamber 12 by the heat of the molten metal Y.
Since the amount of the introduced chips is small relative to the amount of the molten metal Y in the melting chamber 23, the molten metal Y has a sufficient amount of heat to dissolve the chips.
Further, downstream of the flow of the molten metal Y, the removal chamber 14 is adjacent to the melting chamber 23.

And the rectification | straightening block B is arrange | positioned in the flow path 23a which supplies the molten metal Y from the melting chamber 23 to the removal chamber 14.
Accordingly, the flow passage 23a for supplying the molten metal Y from the melting chamber 23 to the removal chamber 14 is narrowed to reduce the width of the passage 23a at the removal chamber 14 side of the passage 23a and the temperature raising chamber 11 side end of the removal chamber 14. S was formed and the flow velocity of the molten metal Y flowing into the removal chamber 14 was increased.
Specifically, the cross section of the rectifying block B is a substantially right triangle, the inclined surface of the substantially right triangle is inclined obliquely with respect to the upstream side, and the other side of the substantially right triangle is in contact with the side surface on the anti-heating chamber 11 side. By doing so, the narrowed portion S is formed by gradually narrowing the width of the flow path 23a from the melting chamber 23 toward the removal chamber 14 side using the hypotenuse of a substantially right triangle.
As shown in FIG. 2, the rectifying block B extends from the bottom of the non-ferrous metal melting furnace 10 and is exposed above the surface of the molten metal Y. Although the amount of the molten metal Y may increase or decrease depending on the amount of chips introduced in the vortex chamber 12, the rectifying block B is always exposed above the surface of the molten metal Y and is long in the vertical direction.

The removal chamber 14 is a chamber that removes impurities present in the molten metal Y supplied from the melting chamber 23 and supplies a part of the molten metal Y to the heating chamber 11. As a method for removing the impurities, a filtration method and a pumping method are used in combination.
The filtration method is a method for removing the debris by using the filter F provided at the supply port of the removal chamber 14 to the temperature raising chamber 11.
The pumping method is a method in which impurities floating in the molten metal Y are periodically or artificially mechanically sprinkled.

  The hot water chamber 15 is a chamber for taking out the molten metal Y to produce a metal product. In the present embodiment, the hot water discharge chamber 15 is adjacent to the removal chamber 14 and has a structure in which the molten metal Y after removing impurities in the removal chamber 14 is supplied.

According to the non-ferrous metal melting furnace 20 configured as described above, the throttle for reducing the width of the flow path 23a is formed on the side of the flow removal room 14 of the flow path 23a for supplying the molten metal Y from the melting chamber 23 to the removal room 14. Since S is formed and the flow velocity of the molten metal Y flowing into the removal chamber 14 is increased, a vortex U is generated in the removal chamber 14 and impurities are collected in the center of the vortex U.
Therefore, since only the center of the vortex U needs to be scrubbed, the removal efficiency is good.
In addition, since the throttle S is formed at the end of the removal chamber 14 on the temperature raising chamber 11 side, one large vortex U is generated in the removal chamber 14. Therefore, impurities are collected in one place of the removal chamber 14, so that the removal efficiency is better.

In addition, since the flow path 23a is gradually narrowed from the melting chamber 23 toward the removal chamber 14, the flow of the molten metal Y is stabilized, and the location of the vortex U generated in the removal chamber 14 does not change.
Further, since the rectifying block B is exposed above the surface of the molten metal Y, the flow of the molten metal Y is not disturbed at the upper and lower portions of the throttle S. Therefore, since the location where the vortex U is generated is stabilized, the impurities collected at the center of the vortex U are not diffused again.
In addition, since the restriction S is formed by installing the rectifying block B, even the existing (sold) non-ferrous metal melting furnace 20 can be stabilized in the dehumidifying chamber 14 simply by installing the rectifying block B. Thus, the vortex U can be generated. Therefore, the impurity removal efficiency can be increased at low cost.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a plan view showing the nonferrous metal melting furnace 20 according to the second embodiment of the present invention. In addition, the same code | symbol was attached | subjected to the same part as 1st embodiment.

The difference from the first embodiment is that when the non-ferrous metal melting furnace 20 is newly manufactured, the wall surface of the flow path 23a is formed in advance so that the width of the flow path 23a is gradually reduced. The structure and elements and the effect of the aperture S are the same as those in the first embodiment.
In short, instead of installing the rectifying block B and reducing the width of the flow path 23a as in the first embodiment, the wall surface of the flow path 23a is formed so that the flow path 23a becomes gradually narrow at the stage of new manufacture. .

In the first and second embodiments, the throttle S is formed at the end of the dehumidifying chamber 14 on the temperature raising chamber 11 side. However, the present invention is not limited to this, and a portion that is not an end as shown in FIG. A diaphragm S may be formed on the surface. In this case, unlike when formed at the end, one large vortex U is not generated in the removal chamber 14. However, since one large vortex U and one small vortex U are stably generated one by one and impurities are collected in the center of each vortex U, the efficiency of removal is higher than when the flow path 23a is not narrowed.
Moreover, you may form the aperture | diaphragm | squeeze S in the edge part by the side of the counter-temperature-raising chamber 11 of the removal chamber 14. Also in this case, since the vortex U is formed at a specific location, the impurity removal efficiency is good.

  Further, the rectifying block B has a substantially right-angled triangular cross section, but is not limited to this, and may have other shapes. That is, any shape that can gradually narrow the flow path 23a in a tapered shape may be used.

  Moreover, although the rectification | straightening block B was exposed above the surface of the molten metal Y, it is not restricted to this, It does not need to be exposed. That is, it is desirable to expose, but compared with the case where there is no rectifying block B, the flow of the molten metal Y is stabilized even if it is not exposed.

In addition, although the hot water supply chamber 15 is supplied with the molten metal Y from the removal chamber 14, it is not limited to this, and the hot water may be discharged at any position. However, from the viewpoint of removing impurities, it is preferable to remove the hot water after the removal and before the introduction of the chips.
In addition, the movement of the molten metal Y between the chambers is performed using the difference in elevation and the pump P, but the position of the pump P is not limited to the inside of the temperature raising chamber 11. That is, as long as the molten metal Y circulates through each chamber, the pump P may be in any chamber.
Moreover, although it heated with the burner in the temperature rising chamber 11, it is not restricted to this, A nonferrous metal should just melt | dissolve even if it is another heating method. The chambers other than the temperature raising chamber 11 may be heated.

Further, although the chips are put into the vortex chamber 12, it is not limited to this, and it may be a non-ferrous metal lump if dissolved.
In addition, although the non-ferrous metal to be dissolved is aluminum, the present invention is not limited to this, and it can also be used for dissolving zinc, magnesium alloys, and the like. In addition, any non-ferrous metal that has low viscosity when melted and can circulate through each chamber of the non-ferrous metal melting furnace 20 can be applied.

It is a top view which shows the nonferrous metal melting furnace which concerns on 1st embodiment of this invention. It is an expansion perspective view which shows the rectification | straightening block in the nonferrous metal melting furnace of FIG. It is a top view which shows the nonferrous metal melting furnace which concerns on 2nd embodiment of this invention. It is a top view which shows the nonferrous metal melting furnace which concerns on other embodiment of this invention. It is a top view which shows the nonferrous metal melting furnace which concerns on a prior art example. It is a top view which shows the nonferrous metal melting furnace which concerns on another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Nonferrous metal melting furnace 11 Temperature raising chamber 12 Vortex chamber 13 Melting chamber 14 Removal chamber 15 Hot water chamber 20 Nonferrous metal melting furnace 23 Melting chamber 23a Flow path B Rectification block F Filter P Pump S Restriction U Vortex Y Molten metal

Claims (4)

A temperature raising chamber for heating and maintaining the temperature of the molten metal;
A vortex chamber for introducing a non-ferrous metal into the molten metal supplied from the heating chamber;
A melting chamber for melting the non-ferrous metal in the molten metal supplied from the vortex chamber by the heat of the molten metal;
A removal chamber that removes impurities present in the molten metal supplied from the melting chamber and supplies a part of the molten metal to the heating chamber;
In a non-ferrous metal melting furnace comprising a hot water discharge chamber for taking out molten metal to the outside,
The shape of the removal chamber is a flat rectangular shape,
A throttle portion for gradually increasing the flow rate of the molten metal by gradually narrowing the width of the flow path for supplying the molten metal from the melting chamber to the side of the removal chamber, A non-ferrous metal melting furnace characterized by being connected to one corner side . The non-ferrous metal melting furnace according to claim 1 , wherein the restriction is formed by arranging a rectifying block on the side of the removal chamber of the flow path. The non-ferrous metal melting furnace according to claim 2 , wherein the rectifying block is exposed above the surface of the molten metal. The rectifying block has a substantially right-angled triangle in cross section, and uses the hypotenuse of the substantially right-angled triangle to gradually narrow the flow path from the dissolution chamber toward the removal chamber side to form the restriction. The non-ferrous metal melting furnace according to claim 2 or 3 , wherein

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