JPS6294789A - Rocking type rotary melting furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oscillating rotary melting furnace for melting a material to be melted, such as an aluminum alloy material, with an efficiency of approximately 60% while rotating the furnace body.

[Prior art]

Conventional rotary melting furnaces of this type consist of a cylindrical furnace body with a perfect circular cross section that is horizontally suspended for free rotation. However, the position and shape of the water reservoir formed in the inner bottom are always constant. Therefore, the material to be melted that is put into the sump and melted there remains almost stationary in the sump even when the furnace body rotates during furnace operation, making it impossible for the rotary melting furnace to fully perform its functions. Ta.

In other words, since the above-mentioned melting furnace has almost no stirring function for the molten metal in the furnace, it takes a long time to melt, and as a result, the longer melting time leads to an increase in fuel consumption, and thermite reaction is more likely to occur, making operation difficult. It lacks stability, and it also has the disadvantage of causing segregation in the product due to uneven temperature distribution due to localized heating of the molten metal surface. In particular, with conventional melting furnaces of this kind, it is possible to melt aluminum dross, aluminum materials with iron, or base metal materials, but it is difficult to obtain ingot products with a uniform structure because aluminum alloy materials cause segregation. was considered difficult.

Therefore, while the furnace is operating, a stirring rod or the like is sometimes used to stir the molten metal in the pool, but in this case, the work in front of the furnace requires a lot of effort and the stirring work is dangerous. Moreover, heating by burners etc. must be temporarily stopped and the furnace lid must be opened before stirring, which results in extremely large heat loss and prolongs the melting time.Additionally, the molten metal surface oxidizes during stirring. This has caused various problems such as poor yield of raw materials because the membrane is destroyed.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and it is possible to stir the molten metal in the sump by rotating the furnace body, the capacity of the sump is large, and the furnace lid can be moved when necessary. The object of the present invention is to provide an oscillating rotary melting furnace that can be opened only with small heat loss.

Another object of the present invention is to provide an oscillating rotary melting furnace that can sufficiently stir the molten metal in the sump even when the amount of molten metal is small.

[Structure of the invention]

The rocking type rotary melting furnace of the present invention has a cylindrical shape with a bottom, and the axis of rotation is a line connecting the axis positions of both ends, and the axis of the middle part is located eccentrically with respect to this axis of rotation. The furnace body bent as shown in FIG. A rocking drive device is provided to swing the furnace lid vertically between a tilted melting position such that the furnace lid is located downward, and a furnace lid that closes the opening of the furnace body is moved between a closed position and a side retracted position. The furnace cover is movably attached to the rocking table, and a burner port is provided on the furnace lid. During melting, the furnace body is in an inclined position with the bottom facing downward, so that it can hold a large amount of molten metal. By bending the part so that its axis is eccentric to the rotation axis, the shape of the pool changes as the furnace body rotates, and the molten metal is sufficiently stirred. The furnace lid is attached to the furnace lid so that it moves following the furnace body, which allows the furnace lid to be opened only when necessary, thereby reducing heat loss.

In addition, the second swing type rotary melting furnace of the present invention is further provided with a continuous swing drive device that slightly swings the swing table in the melting position up and down. Even in cases where a puddle is formed only at the bottom of the furnace body, where there is little water, and the stirring caused by the rotation of the furnace body is not sufficient, this continuous rocking drive device can swing the furnace body up and down to provide sufficient stirring. It is characterized by the following.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. The furnace body 1 has a cylindrical shape with a bottom, and an inner lining 2 made of a refractory lining material such as refractory bricks is formed on the entire inner surface of the outer shell. The furnace body 1 is formed so that its axis is bent in a dogleg shape. In addition, a line passing through the axis positions of both ends of the furnace body l is defined as the rotation axis 3, and the rotation is made coaxially with this rotation axis 3 to the outer periphery at a position an appropriate distance away from the bottom outer periphery and the opening end. Rings 4 and 5 are attached and fixed. A rotary drive shaft 6 is provided protruding from the outer bottom surface of the furnace body 1 at a rotation axis 3 position, and a transmission gear 7 is attached to the tip thereof.

A rocking table 8 that rotatably supports the furnace body 1 is arranged to be able to swing up and down about a position near the lower end of the opening 1a of the furnace body 1. That is, the pivot brackets 9 extend obliquely upward from both sides of the front end of the rocking table 8 so that their tips are located on both sides of the lower end of the furnace main body opening 1a, and their tips are attached to the pivot shafts. It is rotatably supported by a support stand 12 installed on a floor surface 11 via a support plate 10 . As shown in FIG. 2, this rocking table 8 is provided with a pair of support rollers I3 and 14 that rotatably support the rotating rings 4 and 5, respectively. Furthermore, a drive device 15 for rotationally driving the furnace body 1 is disposed at the rear end of the rocking table 8 .

This drive device 15 is composed of a hydraulic motor 16, a reduction gear 17, and a drive pinion 18 that meshes with the transmission gear 7. Note that the lower surface 8a of the rear end of the rocking table 8 is inclined obliquely upward. Furthermore, guide rollers 19 are disposed on the rocking table 8 and engage the rotating ring 4 from both sides to restrict movement of the furnace body 1 in the axial direction.

A pit 20 is formed at the rear of the support base 12 on the floor 11, and a cylinder device 21 for driving the rocking base 8 to swing up and down is installed on the bottom of the pit 20 so as to be swingable back and forth via a bracket 22. The tip of the piston rod 21a is connected to a coupling bracket 23 protruding from both rear sides or the negative side of the rocking table 8. In the extended state of the cylinder device 21, as shown in FIG. 1, the rotation axis 3 of the furnace body 1 is in an almost horizontal position with a slight incline such that the furnace body opening la side is located slightly downward. In the contracted state, as shown in FIG. 2, the furnace body I is tilted so that the bottom of the furnace body L is positioned downward, and the material put into the furnace body I is in a position to tap out the molten metal in the furnace body I. It is configured to be in a melting position in which the melt is stirred and melted as the furnace body 1 rotates, and in this melting position, the lower surface 8a of the rear end of the rocking table 8 is in the pit 20.
It is adapted to be abutted and supported by the stepped portion 20a.

As shown in FIGS. 2 and 3, a furnace lid 24 for closing the opening 1a of the furnace body 1 is provided. A burner rod 25 for injecting fire into the furnace body 1 is formed on the furnace lid 24, and a heavy oil burner 26 is attached. Further, a smoke exhaust port 27 is formed in the upper part of the furnace lid 24, and the upper end thereof faces the open end of a fixedly installed smoke exhaust duct 28. As shown in FIGS. 4 to 6, this furnace cover 24 has pillars 29 and 29 extending from both sides of the front end of the rocking table 8 toward positions on both sides diagonally above the upper end of the furnace main body opening 1a. It is supported so as to be movable between a closed position where the opening 1a of the furnace body 1 is closed and a retracted position where the opening 1a of the furnace body 1 is retracted to the side along a pair of guide rails 30 installed between them. Specifically, the furnace M24 is suspended and supported by a movable roller 31 along a guide rail 30, and both ends of a chain 330 are wound between sprockets 32 disposed at both ends of the guide rail 30. is connected to the roller 31, and one sprocket 32 is connected to the rotation transmission mechanism 3.
The furnace M24 is configured to be rotatably driven by a drive motor 35 via a motor 4, and the furnace M24 is configured to be movably driven by the drive motor 35 as shown by the arrow in FIG.

As shown in FIG. 7, on the bottom surface of the pit 20, a small cylinder device 36 for continuous rocking drive with a small stroke, which is separate from the cylinder device 21, is installed via a tg movement bracket 37. The tip member 38 of the piston rod of the device 36 is in contact with the lower surface of the receiving member 39 fixed to the rocking table 8, and by continuously expanding and contracting the small cylinder device 36, the rocking table 8 is moved to the seventh position. It is configured to swing up and down continuously within a small range between the state shown by the solid line and the state shown by the imaginary line in the figure. Note that while the small cylinder device 36 is in operation, the cylinder device 21 is in a telescopic state, and when the swing table 8 is swung upward by the cylinder device 21, the small cylinder device 36
Appropriate rotation resistance is provided between the swing bracket 37 and the small cylinder device 36 so that when the swing table 8 descends again while maintaining its posture, the tip member 38 comes into contact with the lower surface of the receiving member 39. has been granted.

In the above configuration, after putting the furnace body 1 in the melting position as shown in FIG. 1 rotates around its rotation axis 3, and the molten metal collects in a pool at the bottom of the furnace body 1. This hot water pool is the second
As shown by solid lines and imaginary lines in the figure, the shape and position of the furnace body 1 change as it rotates, so that the molten metal inside is sufficiently stirred. During this time, the furnace lid 24 is opened at the opening 1a of the furnace body 1.
We are currently closing this down.

Further, when the amount of molten metal is small, the molten metal in the furnace body 1 is actively stirred by continuously expanding and contracting the small cylinder device 36 and vertically swinging the rocking table 8.

Next, when discharging the molten metal, the cylinder device 21 is extended and the rocking table 8 is rotated upward, so that the furnace body 1 is placed in the tapping position as shown in FIG. The hot water is discharged from the opening 1a. In addition, immediately before or during this rotation, the furnace lid 24 is moved to a side retracted position by the drive motor 35. Further, the furnace body 1 is at a rotational position rotated by 90 degrees from the rotational position shown by solid lines and imaginary lines in FIG. It is stopped at a rotational position such that no molten metal remains when tapping.

In the above embodiment, the shaft center of the furnace body 1 is bent in a curved shape with respect to the rotational shaft center 3, but the curved shape is not limited to this, and may be, for example, trapezoidal. It may be bent.

[Effects of the Invention] Since the rocking rotary melting furnace of the present invention has the above configuration, it exhibits the following remarkable effects.

- Since the furnace body is cylindrical with a bottom and takes an inclined position with the bottom facing downward during melting, a large amount of material to be melted can be melted.

■ Since the furnace body is tilted and the axis of the middle part is eccentric with respect to the rotation axis of the furnace body, the shape and position of the sump changes as the furnace body rotates. Molten metal can be effectively stirred just by rotating the main body.

As a result, the amount of heat sent from the burner is effectively transferred to the material to be melted, the melting time is significantly shortened, and fuel consumption is reduced. Furthermore, since there is no need to open the furnace lid and stir, heat loss can be reduced.

■ Since the temperature distribution of the molten metal becomes uniform, there is no segregation in the product, and it is possible to obtain ingot products with a uniform structure even for aluminum alloy materials, etc., which widens the range of applications for the materials to be melted and improves the quality of the product. You can improve your skills.

■ Since stirring can be performed without destroying the oxide film formed on the surface of the molten metal, the chill mint reaction is less likely to occur and stable operation at low temperatures is possible, and the yield of raw materials is also improved.

■ Since the furnace lid is attached to a rocking table and swings together with the furnace body, the opening of the furnace body can be opened only when necessary, reducing heat loss.

(2) If a continuous rocking drive device is provided, the stirring effect can be enhanced by vertically rocking the rocking table while the furnace body is rotating, and even when the amount of molten metal is small, stirring can be ensured.

[Brief explanation of drawings]

The drawings show a schematic configuration of an embodiment of the present invention, and FIG. 1 is a side view of the state when hot water is tapped, with some components omitted, and FIG. 2 is a side view with some components omitted. A side view of the state at the time of melting, Figure 3 is a front view with the right half partially omitted,
The left half is a partially omitted rear view, Figure 4 is a schematic configuration diagram of the furnace cover moving device, Figures 5 and 6 are side views showing the arrangement of the furnace lid, and Figure 7 is a continuous rocking of the rocking table. FIG. 2 is a schematic layout configuration diagram of a dynamic drive device. ■ is the furnace body, 3 is the rotation axis, 8 is the rocking table, 9 is the pivot bracket, 12 is the support stand, 13 and 14 are the support rollers, 15
is a drive device, 21 is a cylinder device (oscillating drive device), 2
4 is a furnace cover, 25 is a burner rod, 29 is a column, 30 is a guide rail, 36 is a small cylinder device (continuous swing drive device),
39 is a receiving member. Patent applicant Kitako Co., Ltd. Figure 1 Figure 3 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. It is shaped like a cylinder with a bottom and is bent so that the axis of rotation is a line connecting the axis positions of both ends, and the axis of the middle part is located eccentrically with respect to this axis of rotation. The furnace body is rotatably installed on a rocking table, and the rocking table is placed in a tapping position in which the axis of rotation is approximately horizontal and the bottom of the furnace body is downward, with the rocking table centered at a position near the lower end of the opening of the furnace body. A rocking drive device is provided to swing the furnace lid up and down between a tilted melting position and a furnace lid that closes the opening of the furnace body between a closed position and a lateral retracted position. A rocking type rotary melting furnace, characterized in that the rocking table is mounted on the rocking table and a burner port is provided on the furnace lid. 2. The furnace body is shaped like a cylinder with a bottom and is bent so that the axis of rotation is a line connecting the axis positions of both ends and the axis of the middle part is eccentric to this axis of rotation. The rocking table was installed rotatably on a table, and the rocking table was tilted so that the axis of rotation was centered at a position near the lower end of the opening of the furnace body and the tapping position was approximately horizontal, and the bottom of the furnace body was positioned downward. A rocking drive device is provided to swing the rocking table up and down between the melting position and a continuous rocking drive device is provided to swing the rocking table up and down in the melting position, and the opening of the furnace body is closed. A rocking type rotary melting furnace characterized in that a furnace lid is mounted on the rocking table so as to be movable between a closed position and a side retracted position, and a burner port is provided on the furnace lid.