JP2007210011A - Apparatus for tapping molten metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for tapping molten metal with which the structure is simple, the safety is high and the tapping speed is rapid. <P>SOLUTION: In the apparatus 10 for tapping the molten metal which taps the molten metal 2 stored in a holding furnace 1; this apparatus is provided with a cylindrical body 11 forming a sucking hole 11a at the lower end part and arranged in the holding furnace 1 so as to dip a sucking hole 11a into the molten metal 2; a feeding tube 12 connected with the upper part of the cylindrical body 11 at the one end part and extending to the outside of the holding furnace 1 at the other end part and for tapping the molten metal 2 from a discharging hole 12a formed at the other end part; and a shaft 13 with an impeller, inserted into the cylindrical body 11 so as to be rotatable of the impeller 13b arranged to the shaft 13a in the inner part of the cylindrical body 11. The upper directional vortex B is developed in the inner part of the cylindrical body 11 by rotating the shaft 13 with the impeller and the molten metal 2 from the sucking hole 11a is pulled up to the upper part of the cylindrical body 2 and also, the pulled-up molten metal 2 is made to flow into the feeding tube 12, and the molten metal is tapped from the discharging hole 12a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a molten metal hot water discharge apparatus that discharges molten metal stored in a holding furnace from a holding furnace in order to move it to a ladle, a front furnace, or the like.

Conventionally, various methods have been adopted as means for discharging molten metal such as an aluminum alloy stored in a holding furnace after being heated and melted from the holding furnace.
For example, in the holding furnace 100 shown in FIGS. 8 and 9, a tap-type molten metal pouring device 110 is used. Here, FIG. 8 is a cross-sectional view of the holding furnace 100, and FIG. 9 is an enlarged cross-sectional view showing a portion of the molten metal pouring device 110. Hereinafter, the molten metal pouring device 110 will be described.

As shown in FIG. 8, the holding furnace 100 is arranged on a gantry 5, in which a molten metal 2 of an aluminum alloy is stored and kept at a high temperature of about 750 ° C. by a burner 3. And as shown in FIG. 9, the hole 8 used as the exit of a molten metal is formed in the bottom face edge part of the holding furnace 100. As shown in FIG.
Then, the molten metal 2 that has come out of the hole 8 is sent out of the holding furnace 100 through the delivery pipe 112, discharged from the discharge port 112 a provided at the tip of the delivery pipe 112, and moved to the ladle 4. It has become.

On the other hand, a control device 6 including a tap cone 7 is provided in order to control the timing of hot water discharged from the holding furnace 100. The tap cone 7 is a conical ceramic member, and closes the hole 8 in a state of being inserted into the hole 8 of the holding furnace 100. The control device 6 controls the hot water discharge timing by moving the tap cone 7 in the left-right direction so as to fit in and out of the hole 8.
As described above, it is possible to supply the molten metal from the holding furnace 100 to the ladle 4 by the molten metal pouring device 110.

In addition, a method of discharging hot water from the holding furnace using a mechanical pump or a vacuum pump is also employed. Furthermore, Patent Document 1 discloses an invention relating to a hot water supply device using a piston as a device capable of supplying a certain amount of molten metal in a holding furnace to a casting machine.
JP 2001-71112 A

However, according to the molten metal hot water discharge device 110 described above, it is necessary to provide the holding furnace 100 with the hole 8 serving as the outlet of the molten metal 2, and there is a concern that hot water leaks from the hole 8. In this method, the hot water is discharged using gravity, and it is necessary to place the holding furnace 100 on the gantry 5 and arrange it at a high position, so that the tap cone 7 is displaced from the hole 8 particularly when an earthquake occurs. The high-temperature molten metal is likely to be scattered, and there is a high risk of workers being burned.
Further, the degree of wear of the tap cone 7 is high, and it is necessary to replace it frequently, resulting in high costs.
Further, the amount of hot water is likely to be unstable depending on the level of the molten metal 2 in the holding furnace 100.

On the other hand, when a mechanical pump or a vacuum pump is used, the number of parts constituting the pump increases, and problems such as parts wear and maintenance occur. In particular, in the case of a vacuum pump, the shape of the ladle is limited in order to realize a vacuum state, and a dedicated hot water pipe connecting the holding furnace and the ladle is also required. Further, in the case of a mechanical pump or a vacuum pump, there is a risk of unexpected breakage and hot water leakage due to the life of the tapping pipe.
The hot water supply apparatus described in Patent Document 1 is useful when a certain amount of hot water is required, but when a large amount of hot water is discharged, the speed is slow and the mechanism is too complicated.

  Therefore, the present invention is to solve the above-described conventional problems, and provides a molten metal pouring apparatus having a simple structure, high safety, and high pouring speed. Moreover, stable hot water discharge is enabled according to the molten metal level in the holding furnace.

  In order to solve the above-mentioned conventional problems, the molten metal hot water apparatus according to the first aspect of the present invention is a molten metal hot water apparatus (10) for pouring molten metal (2) stored in a holding furnace (1). And a cylindrical body (11) disposed in the holding furnace (1) such that a suction port (11a) is formed at a lower end, and the suction port (11a) is immersed in the molten metal (2). ), One end is connected to the upper portion of the cylindrical body (11), the other end extends to the outside of the holding furnace (1), and a molten metal (from a discharge port (12a) formed at the other end 2) A feeding pipe (12) for discharging hot water and an impeller (13b) provided on the shaft (13a) are inserted into the cylindrical body (11) so as to be rotatable inside the cylindrical body (11). A shaft (13) with an impeller, and rotating the shaft (13) with an impeller And generating an upward vortex (B) inside the cylindrical body (11), pulling up the molten metal (2) from the suction port (11a) to the top of the cylindrical body (11), and The pulled molten metal (2) is poured into the delivery pipe (12) and discharged from the discharge port (12a).

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the delivery pipe (12) is formed in a bowl shape in which the inside is visible.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the delivery pipe (12) is formed to be inclined downward toward the outside of the holding furnace (1). It is characterized by that.

  The invention according to claim 4 is characterized in that, in the invention according to any one of claims 1 to 3, the shaft with impeller (13) is movable in the vertical direction. .

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

According to the first aspect of the present invention, the cylindrical body having the suction port formed at the lower end is disposed in the holding furnace so that the suction port is immersed in the molten metal. And a suction port can be used as the entrance.
In addition, one end of the delivery pipe is connected to the upper part of the cylindrical body, and the other end of the delivery pipe in which the discharge port is formed is extended to the outside of the holding furnace. The outlet can be the outlet.
In addition, since the shaft with the impeller is inserted into the cylindrical body, and the impeller provided on the shaft is rotatable inside the cylindrical body, the shaft with the impeller is rotated so that an upward vortex flow is generated inside the cylindrical body. Can be generated. Then, by the action of this vortex, the molten metal can be pulled up from the suction port to the upper part of the cylindrical body, and the pulled molten metal can be poured into the delivery pipe and discharged from the discharge port.
As described above, it has a simple structure of a cylindrical body, a delivery pipe, and a shaft with an impeller, and it is not necessary to make a hole in the holding furnace, and is highly safe. Furthermore, the hot water discharge speed can be increased by adjusting the shape and size of the cylindrical body and the delivery pipe, the rotational speed of the shaft with the impeller, and the like. Further, by changing the number of revolutions of the shaft with the impeller according to the level of the molten metal in the holding furnace, stable hot water can be discharged.

  Further, according to the invention described in claim 2, in addition to the function and effect of the invention described in claim 1, since the delivery pipe is formed in a bowl shape in which the inside can be visually observed, Also in the flow path of the delivery pipe, the hot water state can be confirmed, and safety can be further improved.

  According to the invention described in claim 3, in addition to the operational effects of the invention described in claim 1 or 2, the delivery pipe is formed so as to be inclined downward toward the outside of the holding furnace. Therefore, the molten metal that has flowed into the delivery pipe can be smoothly moved to the discharge port along the inclination.

  According to the invention described in claim 4, in addition to the operational effects of the invention described in any one of claims 1 to 3, the shaft with the impeller is movable in the vertical direction. Therefore, the shaft with the impeller can be moved according to the molten metal level of the stored molten metal, and the increase or decrease of the molten metal in the holding furnace can be dealt with.

Next, with reference to FIG. 1 thru | or FIG. 7, the molten metal tapping apparatus which concerns on embodiment of this invention is demonstrated. FIG. 1 is a cross-sectional view showing a holding furnace 1 provided with a molten metal pouring device 10 according to the present embodiment.
As shown in FIG. 1, a molten metal 2 of an aluminum alloy that is heated and melted is stored in the holding furnace 1, and is maintained at a high temperature of about 750 ° C. by a burner 3 provided in the holding furnace 1. I'm leaning. Unlike the holding furnace 100 according to the conventional example shown in FIG. 8, the bottom of the holding furnace 1 is not provided with a hole serving as an outlet for the molten metal 2.
Then, the molten metal 2 is discharged out of the holding furnace 1 through the molten metal hot water supply device 10 provided in the holding furnace 1 so that the molten metal can be supplied to the ladle 4.

In FIG. 2, the expanded sectional view of the molten-metal pouring apparatus 10 is shown. The molten metal hot water apparatus 10 is mainly composed of a cylindrical body 11, a delivery pipe 12, and a shaft 13 with an impeller that rotates by driving of a motor 14.
The cylindrical body 11 has a suction port 11 a formed at the lower end thereof, and is disposed in the holding furnace 1 so that the suction port 11 a is immersed in the molten metal 2.
One end of the delivery pipe 12 is connected to the upper part of the cylindrical body 11. Further, the other end of the delivery pipe 12 extends in the substantially horizontal direction outside the holding furnace 1, and a discharge port 12a for pouring the molten metal 2 is formed downward at the end.

  FIG. 3 is a front view showing the cylindrical body 11 and the delivery pipe 12, and FIG. 4 is a plan view of the same. FIG. 5 is a cross-sectional view taken along the line AA in FIG. Note that the dotted lines in FIG. 3 are shown to show the hollow portions of the cylindrical body 11 and the delivery pipe 12.

As shown in FIGS. 3 and 4, the cylindrical body 11 is formed in a cylindrical shape by a peripheral wall 11 b with a suction port 11 a provided at the lower end and an upper end opened. Further, a step 11c is formed in a tapered shape in the vicinity of the upper portion of the peripheral wall 11b so as to increase in diameter from the bottom to the top.
One end of a delivery pipe 12 is connected to the upper part of the cylindrical body 11. The delivery tube 12 extends from the upper part of the cylindrical body 11 in a substantially horizontal direction, and the tubular body 11 and the delivery tube 12 are connected so as to be substantially L-shaped. A discharge port 12 a is formed at the distal end of the delivery pipe 12 downward. Furthermore, the flow path 9 through which the molten metal 2 flows is formed by the side wall 12b, the bottom wall 12c, and the tip wall 12d.

The delivery tube 12 only needs to extend substantially horizontally from the upper part of the cylindrical body 11 so that the tip extends to the outside of the holding furnace 1 when installed in the holding furnace 1. If it forms so that it may become a downward slope toward the outer side of this, since the molten metal 2 can be smoothly moved toward the discharge outlet 12a, it is preferable.
In addition, as shown in FIG. 2, the cylindrical body 11 is disposed so as to be inserted in the vertical direction with respect to the molten metal 2 of the holding furnace 1, but is not limited thereto, and the molten metal is not limited thereto. 2 may be inserted in an oblique direction. Thereby, the force required for pulling up the molten metal 2 can be reduced.

The arrows shown in FIG. 4 indicate the direction of the vortex W of the molten metal 2 generated in the cylindrical body 11. The delivery pipe 12 is connected to a position biased with respect to the cylindrical body 11 (lower left portion of the cylindrical body 11 in FIG. 4) so that the flow path 9 corresponds to the outflow direction of the molten metal 2 due to the vortex W. Yes. Thereby, the molten metal 2 can be smoothly poured from the cylindrical body 11 into the flow path 9.
Further, by forming a tapered step 11 c along the vortex W near the upper portion of the cylindrical body 11, the molten metal 2 can be poured more smoothly.

As shown in FIG. 5, the upper side of the flow path 9 is opened, and the delivery pipe 12 is formed in a bowl shape by the side walls 12b and 12b and the bottom wall 12c. Thereby, the delivery pipe | tube 12 can be visually observed from upper direction, and the molten metal 2 which flows through the flow path 9 can be confirmed now.
Note that the molten metal 2 may be prevented from being scattered without opening the flow path 9 of the delivery pipe 12 or the upper end of the cylindrical body 11.

FIG. 6 is a perspective view showing the shaft 13 with an impeller inserted into the cylindrical body 11.
The shaft 13 with an impeller is formed by a shaft 13a and an impeller 13b provided at the tip of the shaft 13a. A plurality of blades are formed on the impeller 13 b, and an upward vortex W can be generated by rotating the impeller 13 b inside the cylindrical body 11.
The size of the impeller 13b is smaller than the inner diameter of the cylindrical body 11 so as not to contact the peripheral wall 11b when rotating inside the cylindrical body 11.

  As shown in FIG. 2, the shaft 13 with an impeller is inserted into the cylindrical body 11 with the impeller 13b facing downward. At this time, the impeller 13b is positioned below the molten metal 2 level. A motor 14 is connected to the upper portion of the shaft 13 with an impeller, and the impeller 13 b rotates inside the cylindrical body 11 by driving the motor 14. The direction of rotation of the impeller 13b is such that an upward vortex W is generated inside the cylindrical body 11 by rotation.

  In the present embodiment, the impeller 13b is provided on the lower end side of the shaft 13 with the impeller, and the motor 14 is connected to the upper end. However, if the impeller 13b is rotatable inside the cylindrical body 11, this is possible. It is not limited to. For example, a shaft with an impeller provided with an impeller at the upper end may be inserted from the discharge port 11a of the cylindrical body 11, and a driving force may be applied from below.

  Here, it is preferable that the shaft 13 with an impeller is movable in the vertical direction inside the cylindrical body 11 so as to be able to move according to the molten metal level of the stored molten metal 2. Thereby, for example, when the molten metal level of the molten metal 2 is lowered as the hot water is discharged, the shaft 13 with an impeller can be moved downward and adjusted so as to be immersed in the molten metal 2.

Further, as the impeller provided on the shaft 13a, a screw-like impeller 13c as shown in FIG. 7 may be used. Thus, in order to increase the force for pulling the molten metal 2 upward, the shape of the impeller can be devised in various ways.
Furthermore, the hot water discharge speed can be increased by changing the shape and size of the cylindrical body 11 and the delivery pipe 12 and the rotational speed of the shaft 13 with an impeller.

  In order to discharge the molten metal 2 from the holding furnace 1 using the molten metal pouring device 10 having the above-described configuration, first, the motor 14 is driven to rotate the shaft 13 with an impeller. Then, due to the rotation of the impeller 13 b, an upward vortex W is generated inside the cylindrical body 11, and the molten metal 2 is pulled up from the suction port 11 a and reaches the upper part of the cylindrical body 11. Then, the molten metal 2 is poured into the delivery pipe 12 from the upper part of the cylindrical body 11, reaches the discharge port 12 a through the flow path 9, and is discharged from the discharge port 12 a to the ladle 4.

According to the molten metal tap water apparatus 10 according to the present embodiment, the cylindrical body 11 having the suction port 11a formed at the lower end is disposed in the holding furnace 1 so that the suction port 11a is immersed in the molten metal 2. Therefore, the cylindrical body 11 can be used as a hot metal discharge path for the molten metal 2 and the suction port 11a can be used as the inlet.
In addition, one end of the delivery pipe 12 is connected to the upper part of the cylindrical body 11, and the other end of the delivery pipe 12 in which the discharge port 12a is formed extends to the outside of the holding furnace 1, so that the delivery pipe 12 is melted. The metal 2 can be used as a hot water outlet, and the discharge port 12a can be used as the outlet.
Moreover, since the shaft 13 with an impeller is inserted into the cylindrical body 11 and the impeller 13b provided on the shaft 13a is rotatable inside the cylindrical body 11, the shaft 13 with an impeller is rotated to rotate the cylindrical body 11. An upward vortex W can be generated in the interior. Then, by the action of the vortex W, the molten metal 2 can be pulled up from the suction port 11a to the upper portion of the cylindrical body 11, and the pulled molten metal 2 can be poured into the delivery pipe 12 and discharged from the discharge port 12a.

  As described above, the molten metal tapping apparatus 10 according to the present embodiment has a simple structure of the cylindrical body 11, the delivery pipe 12, and the shaft 13 with an impeller, and does not require a hole in the holding furnace 1 and has safety. high. Furthermore, the hot water discharge speed can be increased by adjusting the shape and size of the cylindrical body 11 and the delivery pipe 12 and the rotational speed of the shaft 13 with an impeller. Moreover, by changing the rotation speed of the shaft 13 with an impeller according to the level of the molten metal 2 in the holding furnace 1, stable hot water can be discharged.

  In addition, since the delivery pipe 12 is formed in a bowl shape that allows the inside to be visually confirmed, not only the discharge port 12a but also the flow path 9 of the delivery pipe 12 can confirm the state of the hot water, thereby further enhancing safety. Can be increased.

  Moreover, since the delivery pipe 12 is formed to be inclined downward toward the outside of the holding furnace 1, the molten metal 2 flowing into the delivery pipe 12 is smoothly moved to the discharge port 12a along the slope. be able to.

  Moreover, since the shaft 13 with an impeller is movable up and down, the shaft 13 with an impeller is moved according to the hot water level of the stored molten metal 2 to increase or decrease the molten metal 2 in the holding furnace 1. It can correspond to.

  In the present embodiment, the molten metal 2 has been described as an aluminum alloy. However, the molten metal 2 can also be used for hot water such as zinc and magnesium alloys, and has a viscosity equal to that of water regardless of specific gravity. Anything can be applied.

It is sectional drawing which shows the holding furnace which concerns on embodiment of this invention. It is sectional drawing which shows the molten metal tapping apparatus which concerns on embodiment of this invention. It is a front view which shows the cylindrical body and delivery pipe which concern on embodiment of this invention. It is a top view which shows the cylindrical body and delivery pipe which concern on embodiment of this invention. It is AA sectional drawing of FIG. It is a perspective view which shows the shaft with an impeller which concerns on embodiment of this invention. It is a perspective view which shows the impeller which concerns on other embodiment. It is sectional drawing which shows the holding furnace which concerns on a prior art example. It is sectional drawing which shows the molten metal tapping apparatus which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holding furnace 2 Molten metal 3 Burner 4 Ladle 5 Mounting stand 6 Control apparatus 7 Tap cone 8 Hole 9 Flow path 10 Molten metal pouring device 11 Cylindrical body 11a Suction port 11b Perimeter wall 11c Step 12 Delivery pipe 12a Discharge port 12b Side wall 12c Bottom Wall 12d Tip wall 13 Shaft with impeller 13a Shaft 13b Impeller 13c Impeller 14 Motor 100 Holding furnace 110 Molten metal hot water supply device 112 Delivery pipe 112a Discharge port W Eddy current

Claims (4)

A molten metal tapping apparatus for tapping molten metal stored in a holding furnace,
A cylindrical body disposed in the holding furnace such that a suction port is formed at a lower end, and the suction port is immersed in the molten metal,
One end is connected to the upper part of the cylindrical body, the other end extends to the outside of the holding furnace, and a delivery pipe for discharging molten metal from a discharge port formed at the other end,
A shaft with an impeller inserted into the cylindrical body so that the impeller provided on the shaft can rotate inside the cylindrical body;
The shaft with the impeller is rotated to generate an upward vortex inside the cylindrical body, the molten metal is pulled up from the suction port to the upper part of the cylindrical body, and the pulled molten metal is sent to the delivery pipe A molten metal hot-water apparatus, wherein the hot metal is poured out and discharged from the discharge port.   The molten metal hot water apparatus according to claim 1, wherein the delivery pipe is formed in a bowl shape in which the inside is visible.   The molten metal hot-water apparatus according to claim 1 or 2, wherein the delivery pipe is formed so as to be inclined downward toward the outside of the holding furnace. The molten metal hot water apparatus according to any one of claims 1 to 3, wherein the shaft with the impeller is movable in a vertical direction.

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