CN210736808U

CN210736808U - Steel tapping trolley

Info

Publication number: CN210736808U
Application number: CN201921474404.9U
Authority: CN
Inventors: 李栋; 高海; 申德彪; 张莲; 王聪; 耿鑫
Original assignee: Shanghai Supezet Engineering Technology Co ltd; Supezet Jingjiang Equipment Manufacturing Co ltd
Current assignee: Shanghai Supezet Engineering Technology Co ltd; Supezet Jingjiang Equipment Manufacturing Co ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-06-12
Anticipated expiration: 2029-09-06

Abstract

The utility model discloses a tapping trolley applied to intermediate frequency furnace smelting. The trolley is communicated with the ladle baking zone and the steel tapping zone, a nitrogen pipe, a gas pipe and an oxygen pipe are designed at the rear part of the trolley, the upper surface of the trolley is of a sandwich structure of a nitrogen cavity, and the nitrogen cavity is communicated with the nitrogen pipe; nitrogen outlets are uniformly distributed on the surface cover plate of the trolley; a concave ladle seat for placing a plunger ladle or a sliding nozzle ladle is designed in the middle of the upper surface of the trolley; the gas pipe and the oxygen pipe are communicated with a ladle baking device of the plunger ladle or the sliding water gap ladle. The molten steel tapping is carried out under the protection of nitrogen, and the molten steel does not contact with air in the whole tapping process, so that oxidation is avoided, and the components and the purity of the molten steel are ensured.

Description

Steel tapping trolley

Technical Field

The utility model discloses be applied to the intermediate frequency furnace and smelt the field, concretely relates to a dolly for tapping, be particularly useful for the special steel of intermediate frequency furnace and smelt.

Background

Along with the increasingly strict energy conservation and environmental protection in China, the elimination rate of the casting industry is high, and particularly the traditional casting process causes the problem of industrial transformation in the casting industry. With the progress of material science, special steel casting becomes the mainstream of the market, but the traditional smelting production process cannot meet the requirement of special steel production. For some alloys, such as those containing Al, Ti, etc. elements which are easily oxidized and active, strict control is required to prevent oxidation during the melting and tapping of the intermediate frequency furnace. Once molten steel is oxidized, oxide inclusions in the molten steel are increased, and the mechanical property of special steel castings is reduced; secondly, the content of elements cannot be accurately controlled, and waste products are generated in severe cases.

For the problems, a vacuum intermediate frequency furnace is generally adopted for smelting, and the smelting and the pouring of the alloy are completed in vacuum. However, the process method is mostly used for small intermediate frequency furnaces and is not suitable for industrial mass production. During production, smelting and pouring are both in vacuum, a large vacuum space is needed, one furnace for smelting and pouring needs to be subjected to vacuum breaking once, and the process time is long, so that the production efficiency is low, and the production cost is high.

The special steel is smelted by a conventional intermediate frequency furnace, the smelting can be carried out by various methods such as protective slag, inert gas protection and the like, and the casting can be carried out by protective casting. However, during tapping, the molten steel inevitably contacts with air, so that the molten steel is oxidized, and therefore, tapping becomes a bottleneck for smelting special steel in a conventional intermediate frequency furnace.

Disclosure of Invention

The utility model provides a technical problem be: provides a steel tapping trolley which prevents molten steel of an intermediate frequency furnace from being oxidized during steel tapping.

The utility model adopts the technical proposal that: the steel tapping trolley is communicated with the ladle baking zone and the steel tapping zone, the upper surface of the steel tapping trolley is of a sandwich structure with a nitrogen cavity, and the nitrogen cavity is communicated with a nitrogen pipe; and nitrogen outlets are uniformly distributed on the upper surface cover plate of the steel tapping trolley, and the protective gas can be nitrogen or inert gas such as argon. A concave ladle seat for placing a plunger ladle or a sliding nozzle ladle is designed in the middle of the upper surface of the steel tapping trolley; and a nitrogen pipe, a gas pipe and an oxygen pipe are designed at the rear part of the steel tapping trolley, and the gas pipe and the oxygen pipe are communicated with a ladle baking device of the plunger ladle or the sliding gate ladle.

The utility model has the advantages that: oxygen is driven out of the steel ladle by coal gas, molten steel tapping is carried out under the protection of inert gases such as nitrogen or argon, the whole tapping process is free from air contact and oxidation, and the components and the purity of the molten steel are ensured.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic drawing of tapping of an intermediate frequency furnace;

wherein: 1-nitrogen tube, 2-gas tube, 3-oxygen tube, 4-nitrogen cavity, 5-nitrogen outlet, 6-ladle seat, 7-rail, 8-intermediate frequency furnace and 9-plunger ladle.

Detailed Description

FIG. 1 is a schematic structural view of the steel tapping trolley of the present invention, wherein the left side is the front part of the steel tapping trolley, and the right side is the rear part of the steel tapping trolley. An inert gas pipeline interface is designed at the rear part of the steel tapping trolley, and nitrogen is the cheapest in inert gas, so that nitrogen is adopted as the inert gas in the embodiment, a nitrogen pipe 1 is installed in the steel tapping trolley, the upper surface of the steel tapping trolley is of a sandwich structure to form a nitrogen cavity 4, and the nitrogen pipe 1 is communicated with the nitrogen cavity 4. And nitrogen outlets 5 are uniformly arranged on the upper surface cover plate of the steel tapping trolley. The nitrogen outlet 5 is distributed on the upper surface cover plate of the steel tapping trolley. The middle part of the upper surface of the tapping trolley is provided with a concave ladle seat 6 for placing a ladle, and a plunger ladle or a sliding nozzle ladle with a sliding nozzle at the bottom of the ladle is usually adopted.

The rear part of the steel tapping trolley is also provided with a gas pipe 2 and an oxygen pipe 3 which are communicated with a ladle baking device of the plunger ladle and used for baking the ladle. The track 7 is connected with the ladle baking area and the stokehole tapping area of the intermediate frequency furnace. The steel tapping trolley bakes the steel ladle in the ladle baking area, and directly moves to the front of the furnace to tap steel during tapping, thereby liberating the crown block. And after tapping, transporting the steel to a pouring station by a crown block.

When the steel tapping trolley works, the plunger ladle 9 is placed into the ladle seat 6, after the plunger ladle is placed stably, the ladle is baked in a ladle baking area, when the intermediate frequency furnace finishes smelting and tapping, the steel tapping trolley moves to the front of the furnace, as shown in figure 2, when the steel tapping is carried out, ① opens a nitrogen pipeline valve, nitrogen enters the nitrogen cavity 4 through the nitrogen pipe 1 and is discharged from a nitrogen outlet 5, the nitrogen exhausts the air around the plunger ladle 9 because an upper cover plate of the steel tapping trolley extends over the nitrogen outlet 5, and further surrounds the plunger ladle 9 to isolate the air, ② closes a valve of the oxygen pipe 3, and when no flame exists at a ladle opening of the plunger ladle 9, the valve of the gas pipe 2 is closed, at the moment, no oxygen exists in the intermediate

frequency plunger ladle

9, ③ starts the furnace 8 to dump and tap steel, and when the molten steel flows into the plunger ladle 9 in an air-free environment and is not oxidized.

In the above embodiment, a sliding gate ladle may be used instead of the plunger ladle tapping. Inert gas such as argon can be used to replace nitrogen for protection.

In general, steel slag of the intermediate frequency furnace is discharged simultaneously, or after tapping, covering slag is scattered on the surface of molten steel of the plunger ladle, and the molten steel is separated from air by reducing slag or the covering slag, so that the molten steel is prevented from being oxidized. Therefore, the molten steel is from the intermediate frequency furnace to the casting station, and the molten steel is not oxidized due to air contact in the whole tapping and transferring process, so that the components and the purity of the molten steel are ensured.

Claims

1. A steel tapping trolley is characterized in that: a nitrogen pipe (1), a gas pipe (2) and an oxygen pipe (3) are designed at the rear part of the steel tapping trolley, the upper surface of the steel tapping trolley is of a sandwich structure with a nitrogen cavity (4), the nitrogen cavity (4) is communicated with the nitrogen pipe (1), and nitrogen outlets (5) are uniformly distributed on a cover plate of the upper surface of the steel tapping trolley; a concave ladle seat (6) for placing a plunger ladle (9) is designed in the middle of the upper surface of the steel tapping trolley; the gas pipe (2) and the oxygen pipe (3) are communicated with a ladle baking device of the plunger ladle (9).

2. Tapping carriage as claimed in claim 1, characterized in that: the plunger package (9) is replaced by a sliding nozzle package.

3. Tapping carriage as claimed in claim 1 or 2, characterized in that: and nitrogen or argon is introduced into the nitrogen pipe (1), the nitrogen cavity (4) and the nitrogen outlet (5).