JPH081315A - Stopper type molten metal pouring device - Google Patents

Abstract

PURPOSE:To reduce the oxidation of molten metal and to produce a high quality casting by arranging a seal part for shutting off the continuity of the inner and the outer parts of a slide nozzle caused by gap at the approaching position of the slide nozzle to a molten metal pouring hole in a mold. CONSTITUTION:A molten metal pouring nozzle 2 is arranged at the bottom part of a ladle 1. This is sealed with a stopper rod 3 by descending a cylinder 4a to hold the molten metal. The pouring nozzle 2 is opened with the stopper rod 3 to pour the molten metal into the pouring hole 8 in the mold. A projecting part 5 is extendedly arranged at the lower part of the pouring nozzle 2. The slide nozzle 14 is fitted to the projecting part 5 in the condition of a little gap and executes the approach and the separation to the pouring hole 8 in the mold with a fitting cylinder 4b as the shifting means. A sealing member 17 is brought into close contact with the upper end part of the slide nozzle 14, and the slide nozzle 14 shuts off the continuity of the inner and the outer parts of the slide nozzle 14 with the gap at approaching position to the pouring hole 8 in the mold. By this constitution, the flow-out of the molten metal from the gap can be restrained without giving any damage to the slide nozzle and the projecting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper type pouring device for pouring molten metal in a ladle into a mold by opening a pouring nozzle and a stopper rod at the bottom of the ladle.

[0002]

2. Description of the Related Art Conventionally, in the casting of cast iron, cast steel, aluminum alloys, etc., an upper mold and a lower mold are molded and superposed in a molding process, and this mold is sent to a pouring process so that a skilled worker can perform it. While adjusting the ladle by tilting it, the molten metal in the ladle is poured into the mold cavity.

These working environments are high-temperature and high-heat environments and, in many cases, molten metals such as iron and aluminum alloy are scattered, which is a dangerous factor. Further, the pouring work requires a high degree of skill and requires skilled workers. For this reason,
There is a strong demand for unmanned pouring, and various pouring devices have been provided.

Of these, the molten metal in the ladle is poured into the mold by opening the pouring nozzle and the stopper rod at the bottom of the ladle. Japanese Utility Model Publication No. 62-29177 discloses either the ladle or the mold. There is a disclosure of a stopper-type pouring device that pours molten metal in a state where they move vertically and are in contact with each other.

As shown in FIG. 3, this stopper type pouring device is provided with a ladle 51 and a pouring nozzle 5 of the ladle 51.
A stopper rod 53 is arranged at 2, and the pouring nozzle 52 is opened and closed by the stopper rod 53.
On the other hand, a separating member 64 formed in a funnel shape using a heat-resistant sheet material or the like is attached to the mold 54. Further, the ladle 51 is fixed on the carrying frame 58,
The carrying frame 58 is supported by pistons 60 of an elevating cylinder 59 arranged on both sides of the mold 54, and the carrying frame 58 is vertically moved by the operation of the elevating cylinder 59.

[0006]

However, in Japanese Utility Model Publication No. 62-29177, it is necessary to move the entire ladle 51 or the entire mold 54 up and down. Therefore, the carrying frame 58, the lifting cylinder 59, and the frame portion. A large-scale lifting mechanism consisting of 61 etc. is required. Further, it is necessary to interpose a separating member 64 between the pouring nozzle 52 of the ladle 51 and the molten metal inlet 55 of the mold 54. Such a separating member 64 may be damaged and consumed during repeated use. It's easy to do.

In order to improve this, the inventors of the present application, as Japanese Patent Application No. Hei 5-103614, fitted with a protruding portion extending below the pouring nozzle of the ladle and a slight gap in the protruding portion. We applied for a stopper-type pouring device having a slide nozzle for approaching and separating from the mold injection port by a combination moving means. According to the Japanese Patent Application No. 5-103614, only the slide nozzle is moved up and down.
A large-scale mechanism for raising and lowering a ladle as disclosed in Japanese Patent No. 29177 is not required. Further, it is not necessary to provide a funnel-shaped opening in the mold, and the injection yield of the molten metal into the mold is improved. Since the ladle and the mold form the molten metal passage through the protrusion and the slide nozzle, energy loss and air entrapment are reduced, and the time and quality of injection can be improved.

However, in the stopper type pouring device of Japanese Patent Application No. 5-103614, the amount of molten metal flowing out from the pouring nozzle may exceed the amount of molten metal flowing into the mold injection port. The molten metal may enter a small gap between the slide nozzle and the slide nozzle, and the slide nozzle may not slide or may flow out to the outside.

The present invention solves the above problems and, even when the amount of molten metal flowing out from the pouring nozzle exceeds the amount of molten metal flowing into the mold inlet, the molten metal is poured into a slight gap between the protrusion and the slide nozzle. An object of the present invention is to provide a stopper-type pouring device that does not invade and does not damage the protruding portion and the slide nozzle.

[0010]

In order to solve the above-mentioned problems, according to the present invention, a pouring nozzle provided at the bottom of a ladle is sealed by a stopper rod to hold molten metal, and the pouring nozzle is stopped by a stopper rod. In the stopper type pouring device that opens and pours the molten metal into the mold pouring port located below,
A protrusion extending to the lower part of the pouring nozzle, a slide nozzle fitted to the protrusion with a slight gap to approach and separate from the mold injection port by a moving means, and the slide nozzle is the mold It is characterized in that it has a sealing portion that blocks conduction between the inside and outside of the slide nozzle due to the gap at a position close to the pouring port. At least a part of the sealing portion is made of a metal O-ring or a fireproof cushioning material.

[0011]

When the slide nozzle comes into contact with the injection port of the mold, the conduction inside and outside the slide nozzle is cut off, and the molten metal injected from the ladle is prevented from rising by the gas in the slide nozzle.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a sectional view of a stopper type pouring device, and FIG. 2 is a partial sectional view of a pouring nozzle and a slide nozzle, which are partially enlarged views of the stopper type pouring device.
The stopper type pouring device has a pouring nozzle 2 at the bottom of the ladle 1.
And the cylinder 4a is lowered by the stopper rod 3 to seal the pouring nozzle 2.

A protrusion 5 is provided at the bottom of the pouring nozzle 2.
A slide nozzle 14 is provided which extends and is fitted to the protruding portion 5 with a gap e of 0.3 mm on one side to approach and separate from the injection port 8 of the mold 7 by the cylinder 4b. The size of the gap e is determined within a slidable range in consideration of thermal deformation of the protrusion 5 and the slide nozzle 14. A flange 16 having a groove on the upper surface is formed at the lower end of the protrusion 5, and a metal O-ring 17 is attached in the groove of the flange 18. The slide nozzle 14 has an inner diameter larger than the outer diameter of the collar 18, and an upper end 18 thereof is formed so as to cover the collar 16. Then, as shown in FIG. 2, at the position where the slide nozzle 14 contacts the mold 7, the collar 16, the metal O-ring 17, and the upper end 18 are in close contact with each other.

Next, the pouring operation of the stopper type pouring device will be described. The ladle 1 is preliminarily replenished with molten metal for one mold, for example, 50 kg of spheroidal graphite cast iron molten metal from the large ladle 19. When it is confirmed that the mold 7 has been carried to the pouring position by the roller conveyor 13, the slide nozzle 14 is lightly brought into contact with the pouring port 8 of the mold 7. At this time, the upper end 18 of the slide nozzle 14, the metal O-ring 17, and the collar 16 are in close contact with each other. Then, the stopper rod 3 is raised by the cylinder 4a, the pouring nozzle 2 is opened, and the molten metal 15b in the ladle 1 is poured toward the pouring port 8 of the mold 7. As shown in FIG. 2, the molten metal 15b from the pouring nozzle 2
Even if the outflow amount of the molten metal is likely to exceed the inflow amount of the molten metal into the casting mold injection port 8, the molten metal 15c is prevented from flowing into the collar of the protrusion 5 by the air in the slide nozzle 14 or a gas such as an inert gas introduced as necessary. It does not rise to 16 parts and the upper part of the collar 16 and other parts are not damaged by the molten metal. The molten metal does not enter the gap e between the protrusion 5 and the slide nozzle 14.

Further, the molten metal 15c in the slide nozzle 14
Is cut off from the outside of the slide nozzle 14, so that the molten metal is less oxidized and a high quality casting can be manufactured.

In the present embodiment, the metal O-ring is used to seal the gap e between the protrusion 5 and the slide nozzle 14, but the same action and effect can be obtained even if a part of the refractory cushioning material is used. Have.

As described above, according to the stopper type pouring device of the present invention, conduction between the inside and outside of the slide nozzle due to the gap is cut off from the protrusion at the bottom of the ladle and the slide nozzle fitted with a slight gap. Since it has a sealing portion for preventing the molten metal from rising more than necessary, the slide nozzle and the protruding portion are not damaged, and the molten metal is prevented from flowing out from the gap. Further, since the molten metal is blocked from the outside of the slide nozzle, it is possible to manufacture a high quality casting with little oxidation.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a stopper type pouring device of the present invention.

2 is a partially enlarged view of the stopper type pouring device shown in FIG. 1. FIG.

FIG. 3 is a sectional view showing a conventional stopper type pouring device.

[Explanation of symbols]

1: Ladle, 2: Pouring nozzle, 3:
Stopper rod, 4: Cylinder, 5: Projection part, 6: Injection passage, 7: Mold,
8: injection port, 9: cavity, 10: sprue, 11: frame, 12: support,
13: Roller conveyor, 14: Slide nozzle, 1
5: Molten metal, 16: Tsuba, 17: Sealing member,
18: Upper end.

Claims (3)

[Claims] 1. A pouring nozzle provided at the bottom of a ladle is sealed by a stopper rod to hold the molten metal, and the pouring nozzle is opened by the stopper rod to inject the molten metal into a mold pouring port located below. In the stopper type pouring device, a projection nozzle extending to a lower portion of the pouring nozzle and a slide nozzle that is fitted to the projection portion with a slight gap and moves to and away from an injection port of the mold by a moving unit. And a stopper-type pouring device, wherein the slide nozzle has a sealing portion that blocks conduction between the inside and outside of the slide nozzle due to the gap at a position close to the mold pouring port. 2. At least a part of the sealing portion is made of metal O.
The stopper type pouring device according to claim 1, which is a ring. 3. The stopper type pouring device according to claim 1, wherein at least a part of the sealing portion is a refractory cushioning material.