JP2948544B2 - Suction type hot water supply ladle lid attachment / detachment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a lid attaching / detaching apparatus for a suction type hot water supply ladle, and more particularly to an improvement in sealing performance and workability.

[0002]

2. Description of the Related Art Conventionally, when casting a casting, a molten metal such as an aluminum alloy is filled into a cavity of a mold.
As a method of this, there is a method in which the molten metal stored in the melting and holding furnace is drawn up with a hot water supply ladder and filled into a cavity of a mold (for example, see Japanese Utility Model Laid-Open No. 3-114147 and Japanese Patent Laid-Open No. 4-9262).

[0003] As another method, a hot water supply ladle having an inlet on the bottom surface is immersed in molten metal, the molten metal is introduced into the hot water supply ladle, and the hot water supply ladle is placed in a mold with the inlet closed by a stopper. To remove the stopper and fill the cavity of the mold with the molten metal.

[0004] However, these methods have a drawback that the molten metal holding amount of the hot water supply ladle varies depending on how the hot water supply ladle is immersed, and the molten metal cannot be supplied to the mold cavity without excess or shortage. A method of supplying a certain amount of molten metal using a suction type hot water supply ladle has been developed.

A method using the suction type hot water supply ladle is as follows.
A closed-type hot water supply ladle in which the upper opening of the ladle main body is covered with a lid is prepared, and an inlet / outlet pipe hanging straight down from the bottom surface of the ladle main body of the hot water supply ladle is dipped in molten metal, and in this state, protrudes upward from the lid. By vacuuming the inside of the ladle body through the suction pipe to make it negative pressure, the molten metal is sucked from the inlet / outlet pipe, and the negative pressure in the ladle body and the gravity of the molten metal are balanced, and the molten metal is put into the ladle body. After a certain amount of measurement and holding, the hot water supply ladle is moved to the mold, the negative pressure in the ladle body is released, and the molten metal is filled into the mold cavity.

[0006] The hot water supply ladle used in this method has a hermetically sealed structure because it is necessary to make the inside have a negative pressure.
The lid is fastened to the ladle body with bolts to prevent leakage and keep the internal negative pressure constant.

[0007]

However, in the above-described countermeasures against leaks, bolts may be loosened, which causes leaks, and the negative pressure in the hot water supply ladder fluctuates, thereby lowering the measurement accuracy. become. Further, there is also a problem that the surface of the molten metal is oxidized when air enters the hot water supply ladle.

Further, in a foundry, cleaning or inspection and repair of a hot water supply ladle is performed at any time or periodically, but each time, a bolt must be removed to separate the lid from the ladle main body. However, there is a problem that it is very troublesome and takes time. Further, when the lid is attached to the ladle main body after cleaning or inspection and repair of the hot water supply ladle, the lid must be bolted to the ladle main body, and the assembling work of the two is troublesome and time-consuming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to ensure the sealing performance of a suction-type hot water supply ladle in which a lid and a ladle body are assembled, and to separate and assemble the same. The task is to perform work easily and quickly.

[0010]

In order to achieve the above-mentioned object, the present invention provides that a lid is attached to or detached from a ladle body using the principle of "weight" and "lever". It is characterized by.

More specifically, the present invention comprises a ladle main body having an access pipe on the bottom surface and having an upper opening, and a lid having a suction pipe and removably covering the upper opening of the ladle main body. Suction-type hot water supply in which the inside of the ladle body is evacuated from the suction pipe to suck the molten metal from the inlet / outlet pipe, and the molten metal is measured and held in the ladle body by a fixed amount by the balance between the negative pressure in the ladle body and the gravity of the molten metal. The following solutions were taken for the lid removal / attachment device of Ladle.

That is, a first solution of the present invention is to provide a ladle holder for holding the ladle body together with the lid.
Further, a holding lever having a projection protruding downward is provided in the middle part, and a base end of the holding lever is attached to the ladle holder so as to be vertically rotatable. Also, a weight is attached to the tip of the holding lever, the holding lever is rotated downward by the weight of the weight, and the lid is pressed by the projection,
The lid is attached to the ladle body with the lid and the ladle body sealed. In addition, a lid support is provided, the weight is brought into contact with the lid support from above by the lowering operation of the ladle holder, and the pressing lever is rotated upward to release the pressing force of the projection against the lid. And the lid is supported by the lid support and detached from the ladle body.

With the above arrangement, in the first solution of the present invention, the lid is held by the ladle holder together with the ladle main body, and is pressed from above by the projection of the holding lever that rotates downward by the weight of the weight, It is pressed and attached to the ladle body. Due to this pressing force, the gap between the lid and the ladder main body is securely sealed and does not leak, and the negative pressure in the hot water supply ladder is maintained at a constant pressure, and the measuring accuracy is improved. Also, no air enters the hot water supply ladle and no oxide film is formed on the surface of the molten metal.

On the other hand, when the ladle holder is lowered and the weight abuts on the lid support from above, the holding lever is pivoted upward to separate the projection from the lid, and the pressing force of the projection against the lid is reduced. The lid is released and the lid is supported by the lid support and removed from the ladle body. Therefore, when cleaning or inspecting and repairing the hot water supply ladle, the lid is separated from the main body of the ladle only by lowering the ladle holder from above the lid support base, so that the separation operation can be performed easily and quickly. Also, when attaching the lid to the ladle main body after cleaning or checking and repairing the hot water supply ladle, install the ladle main body on the ladle holder and raise the ladle holder, and the lid covers the upper opening of the ladle main body. The lid is pressed by the projection by the weight of the weight, and the lid is automatically attached to the ladle body, so that the assembling operation of the two can be performed easily and quickly.

According to a second aspect of the present invention, in the first aspect, the hot water supply ladle includes a ring-shaped seal space formed between an outer peripheral portion of the ladle body and an outer peripheral portion of the lid. I do. An inert gas is supplied to the seal space so that external air does not enter the ladle body.

With the above arrangement, according to the second solution of the present invention, the outside air which tries to enter the inside from the joint portion of the lid and the ladle body is blocked by the inert gas in the seal space, The sealing property between the and the ladle body is further improved.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a lid attaching / detaching apparatus A according to an embodiment of the present invention. The lid attaching / detaching apparatus A is a suction type hot water supply ladle B for supplying a molten metal such as an aluminum alloy to a mold cavity during casting. For removing and attaching the lid as needed.

Before the description of the lid attaching / detaching apparatus A, the structure of the hot water supply ladle B will be described.

As shown in FIG. 6, this hot water supply ladle B
An upper opening is provided with a ladle body 1 formed in a cylindrical shape with a bottom and an upper opening. The upper opening of the ladle body 1 is detachably covered with a lid 2. An access tube 3 is hung down on the bottom surface of the ladle main body 1, and a suction tube 4 protrudes upward from the lid 2. The suction pipe 4 is connected to a vacuum pump (not shown), and the inside of the ladle body 1 is evacuated from the suction pipe 4 by operating the vacuum pump to suck the molten metal M from the inlet / outlet pipe 3.
A fixed amount of the molten metal M is measured and held in the ladle main body 1 by the balance between the negative pressure in the ladle main body 1 and the gravity of the molten metal M.

A gas supply pipe 5 projects upward from the upper surface of the lid 2, and a pair of receiving pieces 2 a (shown in FIGS. 1 to 3) project laterally from the outer periphery of the lid 2. A ring groove 2b is formed in the outer peripheral portion of the back surface. Also,
A flange 1a is formed on the outer periphery of the opening of the ladle main body 1 so as to project laterally, and a gasket 6 having a hole 6a is interposed between the outer periphery of the flange 1a and the outer periphery of the lid 2. With the hole 6a corresponding to the suction pipe 4, a ring-shaped seal space 7 is formed between the two by the ring groove 2b.

Further, the gas supply pipe 5 is connected to a gas cylinder 9 via a gas regulator 8, and supplies the inert gas sealed in the gas cylinder 9 to the seal space 7 while adjusting the flow rate with the gas regulator 8. By discharging the inert gas supplied to the seal space 7 to the outside through a slight gap between the lid 2 and the flange 1a of the ladder body 1, external air is prevented from entering the ladle body 1. I have to.

The manner of construction of the seal space 7 is not limited to the above. For example, as shown in FIG. 7A as a first modification, the ring groove 2b is not formed in the lid 2 and a gasket is used instead. The seal space 7 may be formed between the lid 2 and the lid 2 with a diameter slightly smaller than the inner diameter of the lid 2. Further, as a second modification, as shown in FIG.
In the structure of the first modification, the flange 1a of the
A stepped portion 1b may be formed in the outer periphery by notch, thereby forming the seal space 7. Further, as a third modification, as shown in FIG. 7C, an inner peripheral groove 2c may be formed in the inner peripheral portion of the back surface of the lid 2 to thereby form the seal space 7.

The hot water supply ladle B thus configured is used while being held by the lid attaching / detaching device A.

As shown in FIG. 1 to FIG.
Comprises a ladle holder 10 for holding the ladle body 1 together with the lid 2, and the tip side of the ladle holder 10 is substantially U-shaped.
The holding portion 10a is formed in the shape of a letter, and the base end side is formed straight to form a grip portion 10b. The holding portion 10a supports the flange 1a of the ladle body 1 from below. . In addition, the above-mentioned ladle holder 10
A support plate 11 is provided upright in the middle, and a base end of a holding lever 13 is attached to an upper end of the support plate 11 so as to be vertically rotatable by a rotation shaft 12. Presser lever 1
In the middle of the lower surface of the lower surface 3, a projection 17 projects downward, and a weight 14 is attached to the tip of the holding lever 13, and a roller 16 is rolled on both ends of the weight 14 via a shaft 15. Mounted freely. And
The holding lever 13 is rotated downward about the rotation axis 12 by the weight of the weight 14 to press the lid 2 from above with the projection 17, and the lid 2 is sealed in a state where the lid 2 and the ladle body 1 are sealed. Is attached to the ladle body 1.

The lid attaching / detaching device A also has a lid support 18 in addition to the above. The lid support base 18 includes four front and rear pillars 19, a connecting member 20 for connecting the four pillars 19 to the left and right two by two at the front and rear, and a support frame bridged at the upper ends of the two front and rear pillars 19. 21. Then, the weight 14 is moved down by the lowering operation of the ladle holder 10 to the support frame 21 of the lid support base 18.
And presses down the holding lever 13 with the rotating shaft 12.
The lid 2 is pivoted upward to release the pressing force of the projection 17 against the lid 2 and the lid 2 is
1 and is detached from the ladle body 1. As shown in the casting equipment of FIG. 5, the lid support base 18 of the lid attaching / detaching apparatus A includes an articulated work robot 22 having a hand 24 at the tip of an arm 23, a melting and holding furnace 25, and a pair of left and right split dies 26a. It is installed and used together with the mold 26 and the like.

Next, the lid attaching / detaching apparatus A constructed as described above.
FIGS. 4 and 5 show examples of the use of the mold for casting and lid removal.
This will be described with reference to FIG.

<At the time of casting> The ladle holder 10 of the lid attaching / detaching device A holding the hot water supply ladle B is gripped by the hand 24 of the working robot 22, and the molten metal M is sucked and held on the hot water supply ladle B by the melting and holding furnace 25. Thereafter, the operation of moving the hot water supply ladle B to the mold 26, filling the cavity 26b of the mold 26 with the molten metal M, returning to the melting and holding furnace 25 again, and sucking the molten metal M into the hot water supply ladle B is repeated. Castings are cast continuously.

At this time, the weight of the weight 14 is applied to the projection 17 of the holding lever 13 so that the hot water supply
Since the lid 2 is pressed from above, the lid 2 and the ladle main body 1 can be reliably sealed so as not to leak, and the negative pressure in the hot water supply ladle B can be maintained at a constant pressure. The weighing accuracy can be improved. Further, since no air enters the hot water supply ladle B, an oxide film can be prevented from being formed on the surface of the molten metal M.

At this time, an inert gas is supplied to the seal space 7 between the lid 2 and the ladle main body 1 to prevent external air from entering the inside from the joint between the two. In addition, the sealing property between the lid 2 and the ladle body 1 can be further improved.

<At the time of removing the lid> First, the ladle holder 10 holding the hot water supply ladle B is gripped by the hand 24 of the working robot 22 and is moved above the lid support base 18.

Next, as shown in FIG. 4 (a), the ladle holder 10 is lowered to place the hot water supply ladle B on the lid support base 1.
8 between the pair of support frames 21 and the rollers 16
Is brought into contact with the support frame 21 from above.

Thereafter, as shown in FIG. 4B, the ladle holder 10 is further lowered. As a result, the roller 16 does not descend, and the weight 14 and the holding lever 1 are not moved.
3 rotates upward around the rotation shaft 12, the projection 17 separates from the lid 2, and the pressing force of the projection 17 of the lid 2 is released.

Thereafter, as shown in FIG. 4C, the ladle holder 10 is further lowered. Thereby, the receiving piece 2a of the lid 2 is supported by the support frame 21, and as shown in FIG. 4D, when the ladle holder 10 further descends, only the ladle body 1 descends and is separated from the lid 2. . In this state, the ladle main body 1 is taken out, and cleaning, inspection and repair are performed.

As described above, the lid 2 can be separated from the ladle main body 1 simply by lowering the ladle holder 10 from above the lid support base 18, and the separation operation can be performed easily and quickly.

When the lid 2 is attached to the ladle body 1 after cleaning or checking and repairing the hot water supply ladle B, the ladle body 1 is set on the ladle holder 10 and the ladle holder 10 is attached.
, The lid 2 covers the upper opening of the ladle main body 1, and the lid 2 is automatically attached to the ladle main body 1 by pressing the lid 2 with the projection 17 by the weight of the weight 14. Can be easily and quickly assembled.

[0037]

As described above, according to the present invention,
Since the ladle main body of the hot water supply ladle is held together with the lid with the ladle holder, the holding lever attached to the ladle holder is lowered by the weight of the weight, and the lid is pressed by the projection protruding from the holding lever. In addition, the gap between the hot water supply ladle and the ladle body is reliably sealed, and the negative pressure in the hot water supply ladle can be maintained at a constant pressure, so that the measuring accuracy can be improved. Further, since no air enters the hot water supply ladle, it is possible to prevent an oxide film from being formed on the surface of the molten metal. On the other hand, when separating the lid and the ladle body, the weight is brought into contact with the lid support base from above by the lowering operation of the ladle holder, and the pressing lever is rotated upward to release the pressing force of the projection against the lid. In addition, since the lid is supported by the lid support and separated from the ladle body, the lid can be easily and quickly separated from the ladle main body only by lowering the ladle holder from above the lid support. Also, in the assembling operation, the lid is placed over the upper opening of the ladle body 1 by simply placing the ladle body on the ladle holder and raising the ladle holder, and pressing the lid with the projection by the weight of the weight, thereby pressing the lid. Since the lid can be automatically attached to the ladle body, the work of assembling them can be performed easily and quickly.

[Brief description of the drawings]

FIG. 1 is a side view of a lid attaching / detaching device of a suction-type hot water supply ladle.

FIG. 2 is a front view of a lid removing device of the suction type hot water supply ladle.

FIG. 3 is a plan view of a lid attaching / detaching device of the suction type hot water supply ladle.

FIGS. 4A to 4D are work process diagrams when the lid is removed from the ladle body.

FIG. 5 is an overall schematic configuration diagram of a casting facility.

FIG. 6 is a sectional view of a hot water supply ladle.

FIG. 7A is a cross-sectional view showing, on an enlarged scale, a sealing portion of a hot water supply ladle according to a first modification. (B) is sectional drawing which expands and shows the sealing part of the hot-water supply ladle of the modification 2. FIG. (C)
FIG. 13 is a cross-sectional view showing, on an enlarged scale, a sealing location of a hot water supply ladle according to a third modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laddle main body 2 Lid 3 In / out pipe 4 Suction pipe 7 Seal space 10 Laddle holder 13 Holding lever 14 Weight 17 Projection 18 Lid support base A Lid removing device B Hot water supply ladle M Molten metal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B22D 39/06 B22D 17/30 B22D 41/00 G01F 11/28

Claims (2)

(57) [Claims] 1. A ladle body having an inlet / outlet pipe on the bottom surface and having an upper opening, and a lid having a suction pipe and removably covering an upper opening of the ladle body. This is a suction type hot water supply ladder lid detaching device in which vacuum is evacuated and the molten metal is sucked from the inlet / outlet pipe, and a fixed amount of the molten metal is measured and held in the ladle main body by the balance between the negative pressure in the ladle main body and the gravity of the molten metal. A holding lever holding the lid with the lid together with a lid, a holding lever having a projection protruding downward in the middle, and having a base end rotatably attached to the holding pad in a vertical direction; A weight attached to the tip of the holding lever, rotating the holding lever downward by its own weight, pressing the lid with the projection, and attaching the lid to the ladle main body in a state where the lid and the ladle main body are sealed; Weight up A lid supporting table which is brought into contact with the upper part by the lowering operation of the ladle holder, releases the pressing force of the projection against the lid by rotating the pressing lever upward, and supports the lid to be removed from the ladle body. A lid removing device for a suction-type hot water supply ladle, comprising: 2. The hot water supply ladle includes a ring-shaped seal space formed between an outer peripheral portion of the ladle main body and an outer peripheral portion of the lid, and external air does not enter the ladle main body into the seal space. 2. The suction type hot water supply ladle lid detaching device according to claim 1, wherein the inert gas is supplied as described above.