JPH0332958Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to improvement of an aluminum melting furnace.

(Prior art) An aluminum melting furnace has a cylindrical furnace body installed vertically, and flame ports of multiple gas burners facing inside from the inner periphery of the lower side wall of the furnace body. Some use the opening as an inlet for the material to be melted.
In such an aluminum melting furnace, the material to be melted is sequentially introduced from the upper opening of the furnace body, and the material to be melted is filled into the furnace body. This charged material to be melted is sequentially melted from the bottom of the furnace body by the combustion heat from each gas burner, and at this time, the combustion exhaust gas is guided to the top of the furnace body and preheats the material to be melted in the upper part of the furnace body. It is then released from a flue connected to the upper inner wall of the furnace body.

By the way, in the melting process in such an aluminum melting furnace, molten aluminum reacts with Q ₂ in the combustion exhaust gas to generate aluminum oxide, and the aluminum oxide is absorbed by the flame port of each gas burner. It opens into the inside of the furnace body from the inner periphery of the cylindrical furnace body, and each flame port faces the material to be melted directly, so it adheres and accumulates on the periphery of each flame port and causes each flame port to It tended to become clogged. As a result, the pressure loss at each flame port increases, resulting in misfires, backfires, and the like.

Therefore, in the past, in order to ensure stable combustion by each gas burner, after all the material to be melted in the furnace body was emptied by melting down the furnace body, if necessary, a gas burner was installed in the furnace body. Aluminum oxide was removed from the open/closed openings using a so-called scraping tool.

(Problems to be solved by the invention) However, in the case of the above aluminum melting furnace,
When removing aluminum oxide, all the materials to be melted in the furnace body must be melted down once.
In order to melt the material to be melted again, it was necessary to start by filling the furnace body with new, unpreheated material to be melted. For this reason,
In order to bring an aluminum melting furnace into a steady state, heat must be added to the material to be melted from an unpreheated state to a molten state, and it takes a considerable amount of time for an aluminum melting furnace to reach a steady state. Ta.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to prevent aluminum oxide from adhering to the periphery of the gas burner flame nozzle as much as possible, as well as to minimize the time required to operate the aluminum melting furnace after removing aluminum oxide. The goal is to reach a steady state.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a melting section continuous to the lower part of the preheating section into which the material to be melted is introduced, and the inside of the melting section is connected to the preheating section. It consists of a central space located on an extension, and an enlarged diameter space surrounding the central space, and the outer surface of the enlarged diameter space includes an end face part whose diameter increases from the inner peripheral edge at the lower end of the preheating part, and a gas an inclined inner circumferential wall in which a burner flame port is formed and whose diameter gradually increases downward from the outer circumferential edge of the end face portion; It consists of a preheating section and an inclined surface connected to an inner bottom wall facing opposite to each other, and an opening/closing opening is opened in the enlarged diameter space.

(Function) With the above-described configuration, even if the aluminum melting furnace 1 is filled with the material to be melted 6, a space is always maintained in the enlarged diameter space 12, and the material to be melted 6 and the flame port for the gas burner 9 are 10, a constant interval can be maintained.

In addition, since aluminum oxide can be removed through the opening/closing port 15 that opens into the expanded diameter space 12, the material 6 to be melted in the aluminum melting furnace 1 can be melted off when removing aluminum oxide. The aluminum melting furnace 1 can be left filled without being heated, and the material 6 to be melted in the aluminum melting furnace 1 is maintained in a preheated state.

Furthermore, since the opening/closing port 15 is opened at the expanded diameter interval 12, aluminum oxide can be removed from the opening/closing port 15, and at that time, the operator can remove the radiant heat from inside the aluminum melting furnace 1. Heat reception can be suppressed as much as possible.

(Effect of the invention) Therefore, in the present invention, the material to be melted 6
Since the flame nozzle 10 and the flame nozzle 10 always maintain a constant interval, the aluminum oxide produced by the reaction between molten aluminum and O ₂ in the combustion exhaust gas flows into the flame nozzle 1.
It is possible to prevent adhesion and accumulation on the periphery as much as possible.

Also, during the aluminum oxide removal work, the preheated material to be melted 6 is kept in the aluminum melting furnace 1, so it is assumed that the material to be melted 6 starts to be melted again. However, the steady state can be reached in a very short time. Therefore, there is no need to hold an excessive amount of molten metal in order to prevent line stoppage in subsequent processes, and stable metal distribution is possible.

Furthermore, since the material 6 to be melted in the aluminum melting furnace 1 is not burnt down during the removal work of aluminum oxide, the combustion exhaust gas from the melting of the material 6 is used to preheat the material 6 to be melted. There is no need to release the aluminum to the outside of the aluminum melting furnace 1 without using it for other purposes, and energy can be saved.

In addition, since it is possible to suppress the worker's reception of radiant heat as much as possible, it is possible to reduce the burden of high-temperature heavy muscular work by the worker, and to shorten the working time.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

1 to 4, 1 is an aluminum melting furnace according to the present invention, and this aluminum melting furnace 1 has a preheating section 2.
, a melting section 3 , and a holding section 4 .

The preheating section 2 has a cylindrical shape extending in the vertical direction, and its inner circumferential wall is made of refractory material. A lid 5 that can be opened and closed is provided at the upper end of the preheating section 2. A guide rail (not shown) for a means for transporting the material to be melted, such as a skip hoist, passes above the upper end opening, and the material to be melted 6, whose main component is aluminum, is filled into the preheating section 2 by the skip hoist or the like. Ru. The lower inner circumferential wall 7 of the preheating section 2 is smaller in diameter than the upper inner circumferential wall 8 above, and the boundary inner circumferential wall between the upper inner circumferential wall 8 and the lower inner circumferential wall 7 improves the falling flow of the material 6 to be melted. It is inclined so as to approach the axial direction of the preheating section 2 from the top to the bottom.

The melting section 3 is continuous with the preheating section 2 and has a cylindrical space A surrounded by a lower inner circumferential wall 7.
The outer surface of the expanded diameter space 12 extends from the lower end surface of the lower inner circumferential wall 7 as described below. The inner peripheral wall 11 is connected to the outer peripheral edge of the end surface C, and the inclined surface 14 is connected to the inner peripheral wall 11.

A plurality of gas burners 9 are arranged on the side peripheral wall of the melting section 3 along its inclination direction, and a flame port 10 of each gas burner 9 opens into the inside of the melting section 3 from the inner peripheral wall 11 of the melting section 3. ing. Each flame port 10
The inner circumferential wall 11 on which is formed is the lower inner circumferential wall 7.
The diameter of the melting section 3 is increased, and an enlarged diameter space 12 is formed inside the melting section 3. Here, the inner peripheral wall 11
is inclined downward from the outer circumferential edge of the lower inner circumferential wall 7 so as to move away from the axial direction of the preheating section 2, and the direction of inclination is such that the material to be melted 6 moves toward the lower inner circumferential wall based on its angle of repose. It is parallel to the locus of falling in a direction away from the axial direction of the preheating part 2 as it goes downward from the inner peripheral edge of the preheating part 7, and the inner peripheral wall 1
1 is in a position where the falling material 6 to be melted does not come into contact with the flame port 10. The inner circumferential wall of the melting section 3 has a flat surface and forms a hearth 13.
3 and the inner circumferential wall 11 are continuous in the radial direction of the melting section 3 via an inclined surface 14 that becomes farther away from the axial direction of the preheating section 2 from the bottom to the top. The direction of inclination is parallel to the flame ejection direction of the gas burner 9. Opening/closing ports 15 and 16 are formed in the melting section 3. The opening/closing port 15 opens into the expanded diameter space 12, and the opening/closing port 16 faces the center of the interior of the melting section 3. Each opening/closing port 1
5 and 16 are work doors 17 provided in the melting section 3;
It will be opened and closed by 18.

The holding section 4 is continuous with the melting section 3, and the holding section 4 has a capacity to hold a certain amount of molten aluminum melted in the melting section 3, and the molten aluminum is distributed to a casting machine in a subsequent process. It is becoming more and more common.

As explained above, in the present invention, the diameter of the inner circumferential wall connected to the outer circumferential edge on the end face side of the preheating section and in which the flame port is formed is enlarged, and the sloped surface continuous to the inner circumferential wall is formed. The melted material does not come into contact with the flame port, and the expanded diameter space is hardly filled with the material to be melted, and the material to be melted that falls based on the angle of repose slides on the slope and moves in the axial direction. This ensures a sufficient distance between the flame port and the material to be melted.

Therefore, in the aluminum melting furnace 1,
Even if the material to be melted 6 is filled from the preheating section 2 to the melting section 3, the expanded diameter space 12 is not filled with the material to be melted 6 and the space is maintained. Therefore, even if molten aluminum reacts with O ₂ in the combustion exhaust gas and aluminum oxide is generated during the melting process by each gas burner 9 in the melting section 3, the material to be melted 6 and each flame port 10 are Because of the constant spacing, aluminum oxide is less likely to adhere or accumulate on the periphery of each flame port 10.

Further, the space is always maintained without being filled with the material 6 to be melted in the expanded diameter space 12, and when the work door 17 is opened, the opening/closing port 15 immediately faces the expanded diameter space 12. Even if aluminum oxide is attached or deposited on the peripheral edge of the melted material 6, the aluminum oxide can be removed while the material to be melted 6 remains filled.

Therefore, the preheated material to be melted 6 remains in the preheating section 2, and even if the material to be melted 6 is melted again, a steady state is reached in an extremely short time. Therefore, stable distribution of molten metal to the subsequent process is possible, and there is no need to increase the amount of molten metal held in the holding section 4 in order to prevent, for example, a stoppage of the casting machine in the subsequent process.

In addition, as in the conventional case of removing aluminum oxide, as the material 6 to be melted in the preheating section 2 is melted off, the preheating section 2 becomes empty, and the combustion process occurs when the material 6 to be melted is melted off. The exhaust gas is not used to preheat the material 6 to be melted and is no longer discharged outside the aluminum melting furnace 1, and energy can be saved.

Furthermore, since the opening/closing port is formed in an enlarged diameter space that is not filled with the material to be melted, aluminum oxide can be removed during operation, and even if aluminum oxide is to be removed, operators can Receipt of radiant heat from within 1 is suppressed as much as possible, reducing the workload of the operator and shortening the working time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an aluminum melting furnace according to the present invention, Fig. 2 is an enlarged cross-sectional view taken along the - line in Fig. 1, Fig. 3 is an enlarged cross-sectional view of the aluminum melting furnace according to the present invention, and Fig. 4 is an enlarged cross-sectional view showing the aluminum melting furnace according to the present invention. The figure is a front view of FIG. 3. 1... Aluminum melting furnace, 2... Preheating section, 3... Melting section, 7... Lower inner peripheral wall, 9... Gas burner,
10...flame port, 11...inner peripheral wall, 12...diameter expansion space, 14...slanted surface, 15...opening/closing port, B...
Central space part, C...end face part.

Claims (1)

[Claims for Utility Model Registration] A melting section continuous to the lower part of the preheating section into which the material to be melted is introduced, and the inside of the melting section includes a central space located on an extension of the preheating section, and a central space located on the extension of the preheating section; The outer surface of the expanded diameter space includes an end surface defined by the lower end surface of the preheating section, and a gas burner flame port formed in the end surface of the end surface. an inclined inner peripheral wall whose diameter gradually increases downward from the outer peripheral edge;
The inner circumferential wall has an inclined surface that is connected to the lower end of the inner circumferential wall and gradually decreases in diameter downward, and is connected to the inner bottom wall that faces the preheating section, and further has an opening/closing opening opened in the expanded diameter space. An aluminum melting furnace featuring: