Skimming device for vacuum tank of RH furnace

Abstract

The utility model provides an RH (Ruhrstahl Heraeus) furnace vacuum tank skimming device, which comprises a skimming mechanism, a skimming mechanism and a skimming mechanism, the skimming mechanism is connected with the vacuum tank through the connecting mechanism; wherein before the molten steel enters the dip pipe, the skimming mechanism can prevent steel slag in a steel ladle from entering the dip pipe before the molten steel, the utility model discloses the skimming device for the vacuum tank, the quantity of the steel slag entering the vacuum tank before vacuum is greatly reduced, the steel slag is prevented from polluting the molten steel, and the service life of the vacuum tank is prolonged. And the quantity of accumulated slag in the vacuum tank can be greatly reduced, molten steel pollution caused by slag collapse after a large amount of accumulated slag is avoided, and the frequency of cleaning the accumulated slag in the vacuum tank and the time for cleaning each time are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of steelmaking, in particular to a RH furnace vacuum tank skimming device. BACKGROUND

[0002] For high-purity special steel smelting, RH furnace vacuum process is an effective means to improve the purity of molten steel and remove gas content in molten steel. However, it works under high vacuum condition, is easily affected by oxidized slag, causes secondary pollution of molten steel, and seriously affects the purity of molten steel. If too much slag accumulates in the vacuum tank, it is easy to collapse in the vacuum process, and the oxidized slag falls and pollutes the molten steel. However, the current main method to reduce the collapse of slag in the vacuum tank is to clean the vacuum tank and the internal slag of the hot bending pipe regularly. However, cleaning the vacuum tank requires the vacuum tank to stop production, which seriously affects the production rhythm. SUMMARY

[0003] The utility model discloses a RH furnace vacuum tank skimming device, which reduces the amount of steel slag entering the vacuum tank before vacuum.

[0004] In order to achieve the above purpose, the utility model provides the following technical scheme: a RH furnace vacuum tank skimming device, comprising: a skimming mechanism, the skimming mechanism is located below the immersion pipe of the vacuum tank; a connecting mechanism, the skimming mechanism is connected with the vacuum tank through the connecting mechanism; wherein, before the molten steel enters the immersion pipe, the skimming mechanism can prevent the steel slag in the ladle from entering the immersion pipe in front of the molten steel.

[0005] Further, the connecting mechanism includes a spring and a connecting rope, one end of the spring is connected with the lower end of the vacuum tank, and the other end of the spring is connected with the skimming mechanism through the connecting rope.

[0006] Further, the skimming mechanism includes a shielding cover, the shielding cover has a groove, and the lower end of the immersion pipe extends into the groove.

[0007] Further, the vertical height of any place on the upper end of the shielding cover is higher than the vertical height of the lower end of the immersion pipe.

[0008] Further, along the direction close to the vacuum tank, the circumference of the cross section of the shielding cover in the horizontal direction continuously increases.

[0009] Further, the material of the shielding cover is iron.

[0010] Further, the thickness of the shielding cover is 0.5mm-1.0mm.

[0011] Further, the material of the connecting rope is iron.

[0012] Further, the length ratio of the connecting rope to the spring is 2:1.

[0013] It can be seen that the RH furnace vacuum tank slag skimming device disclosed by the utility model can greatly reduce the quantity of steel slag entering the vacuum tank before vacuumization, avoid steel slag from polluting molten steel, can also greatly reduce the quantity of accumulated slag in the vacuum tank, avoid the pollution of molten steel caused by a large quantity of accumulated slag, and reduce the cleaning frequency of the accumulated slag in the vacuum tank and the cleaning time each time. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the utility model and are incorporated herein for explanation by referring to the embodiments and explanations thereof. Among them:

[0015] Figure 1 The structural schematic diagram of the embodiment of the utility model.

[0016] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the utility model and are incorporated herein for explanation by referring to the embodiments and explanations thereof. Among them: DETAILED DESCRIPTION

[0017] The utility model will be described below in detail with reference to the drawings and in combination with the embodiments. Each example is provided by the explanation of the utility model but not limits the utility model. Actually, the person skilled in the art will clearly know that the modification and change can be made in the utility model without departing from the scope or spirit of the utility model. For example, the features shown as or described as a part of one embodiment can be used in another embodiment to produce another embodiment. Therefore, it is expected that the utility model contains such modification and change that belongs to the scope of the appended claims and its equivalents.

[0018] In the description of the utility model, the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and does not require the utility model to be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. The terms "connected", "connected", "provided" used in the utility model should be understood broadly, for example, it can be fixed connection, can also be detachable connection, can be directly connected, also can be indirectly connected through intermediate parts, can be wired electrical connection, wireless electrical connection, or wireless communication signal connection, for the person skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0019] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” “third,” and “fourth,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of a single component.

[0020] like Figure 1 As shown, according to an embodiment of the present invention, a slag skimming device for a vacuum tank of an RH furnace is provided, comprising:

[0021] A skimming mechanism is located below the impregnation tube of the vacuum tank;

[0022] The skimming mechanism described above includes a shield with a groove, the lower end of which extends into the groove.

[0023] The vertical height of any point on the upper end of the aforementioned shield is higher than the vertical height of the lower end of the impregnation tube.

[0024] Along the direction close to the vacuum trough, the perimeter of the horizontal cross-section of the shield continuously increases.

[0025] The aforementioned shield is shaped like a conical hat, with its pointed end facing the ladle car. As the molten steel rises, the shield gradually melts, thus ensuring that the shield does not interfere with the molten steel entering the immersion tank.

[0026] Preferably, the shield is made of iron. An iron shield can minimize the impact of molten iron on steel smelting.

[0027] The thickness of the aforementioned shield is 0.5mm-1.0mm, and can be selected as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm, with 0.7mm being preferred. The thickness of the shield can meet the requirements for shielding steel slag, while minimizing the total amount of molten steel melted into the shield, ensuring that the melting of the shield will not affect the steel smelting.

[0028] A connecting mechanism is provided, through which the skimming mechanism is connected to the vacuum tank.

[0029] The number of the aforementioned connecting mechanisms is usually two, but the specific number can be changed according to actual usage requirements.

[0030] The aforementioned connecting mechanism includes a spring and a connecting rope. One end of the spring is connected to the lower end of the vacuum tank, and the other end of the spring is connected to the skimming mechanism via the connecting rope.

[0031] Typically, a spring is connected to only one connecting rope, but users can change the number of connecting ropes connected to the spring according to the actual situation.

[0032] The connecting rope is made of iron. The rope will melt upon contact with molten steel, causing the spring to contract automatically without affecting its reuse.

[0033] The end of the connecting rope that connects to the shield usually has a hook. The shield has a lifting hole, through which the hook passes and connects to the shield, thereby lifting the shield.

[0034] The length ratio of the connecting rope to the spring is 2:1. This length ratio ensures that the shielding cover remains in contact with the immersion tube while preventing the spring from melting due to contact with molten steel.

[0035] Specifically, before the molten steel enters the immersion tube, the slag skimming mechanism can prevent slag in the ladle from entering the immersion tube before the molten steel.

[0036] During use, when the molten steel in the ladle is lifted and comes into contact with the immersion pipe, the slag in the ladle will not directly enter the vacuum tank due to the slag skimming mechanism. Instead, it will be blocked by the slag skimming device, which is made of thin iron sheet. After contacting the molten steel, it will melt and will not affect the normal entry of the molten steel into the vacuum tank. In addition, the connecting rope will melt and break quickly after contacting the molten steel, and the spring locking device will automatically retract to avoid the molten steel. In actual use, this device can be quickly installed through the RH vacuum tank spraying vehicle, and the operating cost is low.

[0037] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects: This utility model discloses a device for skimming slag from a vacuum tank, which significantly reduces the amount of steel slag entering the vacuum tank before vacuuming, avoiding slag contamination of the molten steel. It also significantly reduces the amount of slag accumulated in the vacuum tank, preventing slag from collapsing and contaminating the molten steel, and reducing the number of times and the time required to clean the slag in the vacuum tank. This device is simple to manufacture, can be made by steel plants themselves, is inexpensive, and is easy to install and maintain. Furthermore, it does not require an additional platform, saving space.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A slag skimming device for a vacuum tank in an RH furnace, characterized in that, include: A skimming mechanism is located below the impregnation tube of the vacuum tank; A connecting mechanism is provided, through which the skimming mechanism is connected to the vacuum tank; The slag skimming mechanism prevents slag in the ladle from entering the immersion tube before the molten steel enters the immersion tube. The connecting mechanism includes a spring and a connecting rope. One end of the spring is connected to the lower end of the vacuum tank, and the other end of the spring is connected to the skimming mechanism via the connecting rope. The skimming mechanism includes a shield with a groove, the lower end of which extends into the groove.

2. The slag skimming device for a vacuum tank of an RH furnace according to claim 1, characterized in that, The vertical height of any point on the upper end of the shield is higher than the vertical height of the lower end of the impregnation tube.

3. The slag skimming device for a vacuum tank of an RH furnace according to claim 1, characterized in that, Along the direction close to the vacuum trough, the perimeter of the horizontal cross-section of the shield continuously increases.

4. The slag skimming device for a vacuum tank of an RH furnace according to claim 1, characterized in that, The shield is made of iron.

5. The slag skimming device for a vacuum tank of an RH furnace according to claim 1, characterized in that, The thickness of the shield is 0.5mm-1.0mm.

6. The slag skimming device for a vacuum tank of an RH furnace according to claim 1, characterized in that, The connecting rope is made of iron.

7. The slag skimming device for a vacuum tank of an RH furnace according to claim 1, characterized in that, The length ratio of the connecting rope to the spring is 2:1.

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