CN110216273B

CN110216273B - Sealing device for direct pouring of refining ladle in vacuum state

Info

Publication number: CN110216273B
Application number: CN201910638915.8A
Authority: CN
Inventors: 闫抒宇; 朱伟伟
Original assignee: Shanghai Electric Shmp Casting & Forging Co ltd
Current assignee: Shanghai Electric Shmp Casting & Forging Co ltd
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2021-04-16
Anticipated expiration: 2039-07-16
Also published as: CN110216273A

Abstract

The invention belongs to the technical field of vacuum steel ingot pouring, and discloses a sealing device for direct pouring of a refining ladle in a vacuum state. The invention has reasonable structure and novel design, forms a closed space between the bottom of the refining ladle and the vacuum tank cover, solves the overall sealing performance under the conditions of sliding water gap switch, sliding plate argon blowing, water gap argon blowing and the like during vacuum steel ingot casting, achieves the aim of directly casting the refining ladle in a vacuum state, can ensure that the vacuum degree in the vacuum tank can reach below 65Pa, and the sealing device is used for more than 20 times, realizes that the sliding water gap switch, the water gap argon blowing and the sliding plate argon blowing of the refining ladle in the vacuum state, and the average vacuum degree in the vacuum tank is 33 Pa.

Description

Sealing device for direct pouring of refining ladle in vacuum state

Technical Field

The invention relates to the technical field of vacuum steel ingot pouring, in particular to a sealing device for direct pouring of a refining ladle in a vacuum state.

Background

And pouring the molten steel into a steel ingot mold through the ladle, and solidifying to form a steel ingot. After the molten steel is smelted in a steelmaking furnace, the molten steel can be forged only by being cast into a steel ingot with a certain shape, and the steel ingot is a main raw material for producing large-scale forgings.

The quality of the steel ingot has very important influence on the quality of the forged piece. The existing large forging generally adopts a steel ingot poured in a vacuum state, namely molten steel is poured into a tundish from a refining ladle under the atmosphere and then poured into a steel ingot mould from the tundish, the steel ingot mould is placed in a vacuum tank, and the tundish and the vacuum tank are sealed, so that the vacuum pouring requirement of the steel ingot is met.

During the process of pouring molten steel into the tundish, the molten steel is oxidized by oxygen in the atmosphere to form a secondary oxidation product, the refractory material in the tundish is scoured and eroded to form refractory material type inclusions, and the secondary oxidation product and the refractory material type inclusions are poured into the steel ingot mould along with the molten steel, so that forgings are easily scrapped. If the refining ladle is adopted for direct casting in vacuum, secondary oxidation of molten steel and scouring and erosion of refractory materials of the tundish can be avoided, the quality of steel ingots is improved, and the waste rate of forgings is reduced.

The existing refining ladle is poured under the atmosphere, and the refining ladle is poured by depending on a tundish, so that the direct pouring under the vacuum can not be realized, and therefore, a sealing device between the refining ladle and a vacuum tank cover needs to be designed to meet the requirement of pouring under the vacuum.

Disclosure of Invention

The invention aims to provide a sealing device for direct pouring of a refining ladle in a vacuum state, which solves the problem of air tightness of the refining ladle in direct pouring in vacuum, integrates an argon blowing system of the refining ladle and meets the requirements of bottom blowing argon of the refining ladle, sliding plate blowing argon, water gap blowing argon and the like. After the sealing device is adopted, the refining ladle can be directly seated on a vacuum tank cover, molten steel is directly poured into a steel ingot mould from the refining ladle in a vacuum state, and the vacuum degree in the vacuum tank can be adjusted

Less than or equal to 65Pa, and meets the technological requirements of vacuum steel ingot casting.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a sealing device for direct pouring under concise package vacuum state, is including welding in the seal chamber of concise package bottom and the sealing ring of welding in vacuum tank cover upper end, seal chamber outside middle part position is equipped with the trompil, and the trompil mid-mounting has the uide bushing.

As a further scheme of the invention: the seal cavity is of an I-shaped annular structure.

As a further scheme of the invention: the middle part of the outer end face of the sealing cavity is provided with 6 connecting holes with the diameter of 20mm and used for installing a bottom blowing argon gas system, a water gap blowing argon gas system and a sliding plate blowing argon gas system, wherein the connecting holes with the numbers of a, b, e and f are used for installing a refining ladle bottom blowing argon gas connecting pipe, the numbers of a, b and f are located on the left side of an A-A axis, the numbers of a connecting hole with the numbers of c are used for installing a refining ladle sliding plate blowing argon gas connecting pipe and located on the left side of the A-A axis, the numbers of d are used for installing a refining ladle water gap blowing argon connecting pipe and located on the left side of the A-A axis, and the axes of the 6 connecting holes are intersected at the same point on the central axis.

As a further scheme of the invention: the opening diameter is 230 mm.

As a further scheme of the invention: the uide bushing is barrel forging structure, and outer terminal surface is equipped with 8 fixing bolt holes.

As a further scheme of the invention: the guide sleeve has an outer diameter of 230mm and is internally inlaid with sealing rubber.

As a still further scheme of the invention: the sealing ring is of an annular structure with a groove, and a rubber ring is embedded in the groove.

Compared with the prior art, the invention has the beneficial effects that:

the utility model provides a sealing device for direct pouring under concise package vacuum state, rational in infrastructure, the modern design makes and forms airtight space between concise package bottom and the vacuum tank cover, the whole leakproofness under the condition such as the slide gate nozzle switch when having solved vacuum steel ingot pouring, slide blow argon, the mouth of a river blows argon, reach the purpose of direct pouring under concise package vacuum state, can make the vacuum in the vacuum tank can reach below 65Pa, this sealing device has used 20 times, realized under the vacuum state, concise package slide gate nozzle switch, the mouth of a river blows argon, the slide blows argon, the vacuum in the vacuum tank is 33Pa on average.

Drawings

FIG. 1 is a schematic structural view of a sealing device for direct casting of refining ladle in vacuum state.

FIG. 2 is a schematic structural diagram of a sealed cavity in a sealing device for direct pouring of refining ladle in vacuum state.

Fig. 3 is a schematic structural diagram of a-a in fig. 2.

Fig. 4 is a schematic vertical sectional structure of a guide cylinder in a sealing device for direct casting of a refining ladle in a vacuum state.

FIG. 5 is a schematic view showing a horizontal sectional structure of a guide cylinder in a sealing apparatus for direct casting of a refining ladle in a vacuum state.

FIG. 6 is a schematic top view showing the structure of a sealing ring in a sealing device for direct casting in a refining ladle under vacuum.

FIG. 7 is a schematic cross-sectional view showing the structure of a sealing ring in a sealing apparatus for direct casting in a refining ladle under vacuum.

In the figure: 1-sealing cavity, 2-guide sleeve, 3-sealing ring, 4-opening, 5-fixing bolt hole and 6-groove.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example 1

Referring to fig. 1, in the embodiment of the present invention, a sealing device for direct casting of a refining ladle in a vacuum state includes a sealing cavity 1 welded to the bottom of the refining ladle and a sealing ring 3 welded to the upper end of a cover of the vacuum vessel.

Referring to fig. 2 and 3, the middle part of the outer end face of the seal cavity 1 is provided with 6 connecting holes with the diameter of 20mm for installing a bottom blowing argon, a water gap blowing argon and a sliding plate blowing argon system, wherein the connecting holes with the numbers of a, b, e and f are used for installing refining ladle bottom blowing argon connecting pipes, are positioned at 55 degrees, 50 degrees and 45 degrees and 50 degrees on the right side of the axis A-A, and the connecting hole with the number of c is used for installing refining ladle sliding plate blowing argon connecting pipes and is positioned at 45 degrees on the left side of the axis A-A; the connecting hole numbered d is used for installing a refining ladle water gap argon blowing connecting pipe, is positioned at the left side of the axis A-A by 40 degrees, is connected through an opening of the sealing cavity 1, and keeps the normal work of bottom blowing argon when the refining ladle is used; during vacuum casting, the sliding plate blows argon, the water gap blows argon to normally work, and the air tightness in the sealed cavity 1 is kept.

Referring to fig. 2 and 3, the seal cavity 1 is an i-shaped annular structure, is made of the same material as the refining ladle, replaces ladle legs of the refining ladle, and plays a role in supporting the weight of the refining ladle and molten steel, and the inner space is provided with a sliding gate mechanism, an argon blowing system and other devices. The seal cavity body 1 moves along with the refining ladle, so that the functions of steel receiving, argon bottom blowing, refining and the like in the normal use of the refining ladle are guaranteed, when molten steel is poured, the seal cavity body is hung on a vacuum tank cover through a crane and aligned with the seal ring 3, the seal cavity body is sealed by utilizing a rubber ring in the groove 6 of the seal ring 3 and depending on the dead weight of the refining ladle, the middle position of the outer side of the seal cavity body 1 is provided with an opening 4, the diameter of the opening 4 is 230mm, and the middle part of the opening 4 is provided with the guide.

Referring to fig. 4 and 5, the guide sleeve 2 is of a cylinder forging structure, 8 fixing bolt holes 5 are formed in the outer end face of the guide sleeve, an oil cylinder support is fixed on the outer side of the guide sleeve, a sliding water gap connecting rod is mounted inside the guide sleeve and located on the same axis with a pull rod of a sliding water gap mechanism, a sealed space is formed between the guide sleeve and the seal cavity 1 and between the guide sleeve and the seal ring 3, when the sliding water gap is opened and closed, the vacuum degree in the vacuum tank is kept to meet the requirement of a pouring process, the outer diameter of the guide sleeve 2 is 230mm, and sealing rubber is inlaid inside the.

Example 2

In another embodiment of the present invention, the embodiment is different from the above embodiments in that the sealing ring 3 is a ring structure with a groove 6, and performs a function of positioning the refining ladle, and a rubber ring is embedded in the groove 6, and the sealing ring and the sealing cavity 1 are sealed by the self weight of the refining ladle.

According to the sealing device, a refining ladle, a sealing cavity 1 and a guide sleeve 2 form a whole, devices such as a sliding water gap mechanism and an argon blowing system are arranged in the refining ladle, the refining ladle is butted with a sealing ring 3 on a vacuum ladle cover when molten steel is poured, a sealed space is formed with a rubber ring in a groove 6 of the sealing ring 3 by means of the self weight of the refining ladle and is consistent with the vacuum degree in a vacuum ladle, and therefore the technological requirement of vacuum steel ingot pouring is met

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a sealing device for direct pouring under concise package vacuum state, its characterized in that, including welding seal chamber (1) and the sealing ring (3) of welding in the vacuum tank cover upper end in concise package bottom, seal chamber (1) outside middle part position is equipped with trompil (4), and trompil (4) mid-mounting has uide bushing (2), seal chamber (1) outer terminal surface middle part is equipped with 6 connecting holes that the diameter is 20mm for install the end and blow argon gas, mouth of a river and blow argon gas, slide and blow argon gas system, wherein the connecting hole of serial number a, b, e, f is used for installing concise package end and blows argon gas takeover, and a, b are located the axis left side of trompil (4), and e, f are located the axis right side of trompil (4), and the connecting hole of serial number c is used for installing concise package slide and blow argon gas takeover, is located the axis left side of trompil (4), and the connecting hole, is positioned at the left side of the axis of the opening hole (4), and the axes of the 6 connecting holes intersect at the same point on the central axis of the sealed cavity body (1).

2. The sealing device for the direct pouring of the refining ladle in the vacuum state according to claim 1, wherein the sealing cavity (1) is an I-shaped annular structure.

3. A sealing device for direct pouring under vacuum of refining ladle according to claim 1, characterized in that the opening (4) has a diameter of 230 mm.

4. The sealing device for the vacuum direct pouring of the refining ladle according to claim 1, wherein the guide sleeve (2) is of a cylinder forging structure, and the outer end face of the guide sleeve is provided with 8 fixing bolt holes (5).

5. A sealing device for vacuum casting of refining ladle according to claim 1 or 4, characterized in that the guide sleeve (2) has an outer diameter of 230mm and is embedded with sealing rubber.

6. A sealing device for vacuum direct pouring of refining ladle according to claim 1, characterized in that the sealing ring (3) is a ring structure with a groove (6), and the groove (6) is embedded with a rubber ring.