Slag prevention device for dip pipe of RH vacuum furnace

Abstract

The utility model relates to a slag prevention device for a dip pipe of an RH vacuum furnace, and belongs to the technical field of auxiliary equipment of the RH vacuum furnace. Comprising a vacuum tank, dipping pipes are symmetrically arranged at the bottom of the vacuum tank, vertically-arranged moving arms are arranged below the dipping pipes, lantern rings are symmetrically arranged at the tops of the moving arms, and the dipping pipes correspond to the lantern rings; a slag stopping film is arranged in the lantern ring, the upper edge of the slag stopping film is hung on the lantern ring, and the moving arm drives the lantern ring to move and drives the slag stopping film to be close to the lower edge of the dip pipe, so that the lower edge of the dip pipe is sleeved with the slag stopping film; the upper edge of the slag stopping film is sleeved with a clamping ring, and the clamping ring is tensioned so that the slag stopping film can be fixed to the lower edge of the dip pipe through the clamping ring. According to the application, the slag on the molten steel surface is discharged and cannot enter the vacuum tank, and the molten steel is ensured to enter the vacuum tank without being hindered for vacuum treatment, so that the steel slag entering the vacuum tank is reduced, and the purity of the molten steel is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a RH vacuum furnace immersion pipe slag prevention device belongs to RH vacuum furnace auxiliary equipment technical field. BACKGROUND

[0002] The vacuum smelting of steel smelting industry is the key process of degassing and purification treatment of steel, and the RH vacuum furnace is one of the main equipment for vacuum smelting of steel, which has the characteristics of fast degassing rate, high efficiency of removing inclusions in molten steel, and little influence of molten steel on refractory pollution. Because at the beginning of RH vacuum furnace smelting, with the lifting of the ladle, the slag above the molten steel will enter the two immersion pipes earlier than the molten steel, and will be sucked into the vacuum tank during the pressure drop in the vacuum chamber. A part of the slag entering the vacuum tank is brought to the RH elbow and the wall of the tank due to molten steel spatter, and another part of the slag is gradually brought into the molten steel in the ladle during the molten steel circulation in the vacuum tank, until the initial slag in the tank is completely removed. The slag entering the vacuum tank not only affects the normal operation of the RH vacuum furnace, but also causes the oxidation of oxygen absorption of steel, the deterioration of purity and other hazards. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a RH vacuum furnace immersion pipe slag prevention device which can not only ensure that the slag on the surface of the molten steel is removed and cannot enter the vacuum tank, but also ensure that the molten steel can enter the vacuum tank for vacuum treatment without obstruction, reduce the entry of steel slag into the vacuum tank, and improve the purity of the molten steel.

[0004] The utility model adopts the technical scheme that a RH vacuum furnace immersion pipe slag prevention device comprises a vacuum tank, immersion pipes are symmetrically arranged at the bottom of the vacuum tank, a moving arm is arranged vertically below the immersion pipes, a sleeve ring is symmetrically arranged at the top of the moving arm, and the sleeve ring corresponds to the immersion pipes, a slag blocking film is arranged in the sleeve ring, the upper edge of the slag blocking film is hung on the sleeve ring, the moving arm drives the sleeve ring to move, the slag blocking film is driven to move close to the lower edge of the immersion pipes, and the lower edge of the immersion pipes is sleeved in the slag blocking film, a snap ring is sleeved on the upper edge of the slag blocking film, the snap ring is pulled tight, and the snap ring fixes the slag blocking film on the lower edge of the immersion pipes.

[0005] The slag blocking film is a conical structure, the inner diameter of the upper edge of the slag blocking film is 10-50mm larger than the outer diameter of the immersion pipes, the thickness of the slag blocking film is 0.2-1.0mm, and the height of the slag blocking film is 300-500mm.

[0006] The slag blocking film is made of a metal material.

[0007] The snap ring is a stainless steel strap, the annular size of the stainless steel strap sleeved on the upper edge of the slag blocking film is the same as the diameter of the upper edge of the slag blocking film, and the total length of the stainless steel strap is 100-200mm longer than the diameter of the upper edge of the slag blocking film.

[0008] Compared with the prior art, the RH vacuum furnace immersion pipe slag prevention device has the advantages that the RH vacuum furnace immersion pipe slag prevention device not only ensures that the slag on the surface of the molten steel is pushed away and cannot enter the vacuum tank, but also ensures that the molten steel enters the vacuum tank for vacuum treatment without being hindered, so that the molten steel slag entering the vacuum tank is reduced, and the purity of the molten steel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a schematic view of an RH vacuum furnace immersion pipe slag prevention device according to an embodiment of the present application;

[0010] Figure 2 It is a schematic view of a clasp;

[0011] In the figure, 1 is a vacuum tank, 2 is an immersion pipe, 3 is a slag prevention film, 4 is a sleeve ring, 5 is a moving arm, 6 is a moving driving device, and 7 is a stainless steel cable tie. DETAILED DESCRIPTION

[0012] The present application will be further described in detail below with reference to the embodiments of the drawings.

[0013] As shown in Figure 1 , 2 , the RH vacuum furnace immersion pipe slag prevention device in the embodiment includes a vacuum tank 1, and the vacuum tank 1 is symmetrically provided with an immersion pipe 2 at the bottom. A moving arm 5 is arranged vertically below the immersion pipe 2, and the moving arm 5 is symmetrically provided with a sleeve ring 4 at the top. The immersion pipe 2 corresponds to the sleeve ring 4. A slag prevention film 3 made of metal material is arranged in the sleeve ring 4, and the slag prevention film 3 is a conical structure. The upper edge of the slag prevention film 3 is hung on the sleeve ring 4, the inner diameter of the upper edge of the slag prevention film 3 is 10-50 mm larger than the outer diameter of the immersion pipe 2, the bottom of the slag prevention film 3 is a tapered head or a round head, the thickness of the slag prevention film 3 is 0.2-1.0 mm, and the height of the slag prevention film 3 is 300-500 mm. A moving driving device 6 is arranged at the bottom of the moving arm 5, the moving driving device 6 drives the moving arm 5 to move up and down, drives the slag prevention film 3 to move close to the immersion pipe 2, and makes the lower edge of the immersion pipe 2 be sleeved in the slag prevention film 3. A clasp is sleeved on the upper edge of the slag prevention film 3, and the clasp is pulled tight to fix the slag prevention film 3 on the bottom of the immersion pipe 2. Before the lower edge of the immersion pipe enters the molten steel in a ladle, the bottom of the slag prevention film breaks the slag surface of the furnace slag and pushes away the furnace slag. Within 1-10 seconds after the slag prevention film enters the molten steel, the slag prevention film is melted or dissolved under the action of high temperature. When the immersion pipe continues to move close to the surface of the molten steel, the lower edge of the immersion pipe is completely immersed in the surface of the molten steel. The slag on the surface of the molten steel is pushed away and cannot enter the vacuum tank, and the molten steel enters the vacuum tank for vacuum treatment without being hindered.

[0014] The clasp is a stainless steel cable tie 7, the annular size of the stainless steel cable tie sleeved on the upper edge of the slag prevention film is the same as the diameter of the upper edge of the slag prevention film, and the total length of the stainless steel cable tie is 100-200 mm longer than the diameter of the upper edge of the slag prevention film.

[0015] The mobile driving device is an electric cylinder, a hydraulic cylinder or a pneumatic cylinder.

[0016] The slag blocking film is made of industrial pure iron or high-carbon carbon steel.

[0017] Before the submerged tube enters the molten steel in the ladle, the bottom of the slag blocking film breaks the slag surface and pushes away the slag, and within 1-10 seconds of the slag blocking film entering the molten steel, the slag blocking film is melted or dissolved under the action of high temperature, so that the slag on the molten steel surface is pushed away and cannot enter the vacuum tank, the molten steel is not hindered to enter the vacuum tank for vacuum treatment, the molten steel slag entering the vacuum tank is reduced, and the purity of the molten steel is improved.

[0018] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claims.

Claims

1. A RH vacuum furnace dip-tube slag prevention device, characterized by: The vacuum tank is provided with an impregnation pipe symmetrically arranged at the bottom, a moving arm vertically arranged below the impregnation pipe, a loop symmetrically arranged at the top of the moving arm, and a slag stopping film arranged in the loop.

2. The RH vacuum furnace dip-tube slag prevention device of claim 1, wherein: The slag stopping film is a conical structure, the inner diameter of the upper end of the slag stopping film is 10-50mm larger than the outer diameter of the impregnation pipe, the thickness of the slag stopping film is 0.2-1.0mm, and the height of the slag stopping film is 300-500mm.

3. The RH vacuum furnace dip-tube slag prevention device of claim 1, wherein: The slag stopping film is made of metal material.

4. The RH vacuum furnace dip-tube slag prevention device of claim 1, wherein: The clamping ring is a stainless steel band, the annular size of the stainless steel band is the same as the diameter of the upper end of the slag stopping film, and the total length of the stainless steel band is 100-200mm longer than the diameter of the upper end of the slag stopping film.

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