Threaded decompression sealing device for emergency plugging of blast furnace iron notch

Abstract

The utility model provides a threaded pressure-reducing sealing device for emergency plugging of a blast furnace iron notch, which is made of a thick-wall seamless steel pipe with the outer diameter of 140mm and the inner diameter of 38mm, and is divided into four sections, namely a threaded pressure-reducing section (2) with trapezoidal threads (T70 * 10, right-handed rotation), a sealing section (I) (3) with trapezoidal threads (T80 * 10, left-handed rotation), a sealing section (II) (4) with trapezoidal threads (T90 * 10, left-handed rotation) and a protection section (5); sealing grooves (8) are formed outside the sealing section (I) 3 and the sealing section (II) 4; the sealing device is matched with the tapping machine (7) and the impact bar (6) to be used when the clay gun cannot normally block the iron notch. The sealing device has the advantages that the sealing device is simple in structure and high in practicability; the threaded pressure reduction section can complete pressure reduction of molten iron and reduce the flow speed in advance, and the fiber rope creates conditions for the sealing section I and the sealing section II to fully block high-pressure and high-temperature molten iron. The problems that manual iron notch plugging consumes long time, has great influence on furnace conditions and is not beneficial to stable production of a blast furnace are solved.

Description

Technical Field

[0001] This utility model belongs to the field of emergency tools for blast furnaces, specifically relating to a threaded pressure-reducing sealing device for emergency sealing of blast furnace tapholes. It reduces pressure through the front threaded structure, lowers the flow rate of molten iron, and achieves multiple seals by wrapping the external thread with high-temperature resistant asbestos. Background Technology

[0002] As a continuous high-temperature, high-pressure, and sealed equipment, the blast furnace uses mud guns to seal the taphole after tapping iron during normal production. If the mud gun equipment malfunctions or burns out, it will directly lead to the inability to seal the taphole, causing accidents such as forced reduction or shutdown of the blast furnace's blast, which seriously affects the safe, stable, and economical operation of the blast furnace. Summary of the Invention

[0003] This utility model provides an emergency sealing device for sealing blast furnace tapholes using a threaded pressure reducing seal. It is used in conjunction with a taphole opening machine (7) and an impact rod (6) when the mud gun cannot properly seal the taphole. The sealing device is made of thick-walled seamless steel pipe and consists of four sections: a threaded pressure reducing section, a sealing section (Ⅰ), a sealing section (Ⅱ), and a trapezoidal protection section. The threaded pressure reducing section has a trapezoidal thread (T70*10, right-handed), the sealing section (Ⅰ) has a trapezoidal thread (T80*10, left-handed), and the sealing section (Ⅱ) has a trapezoidal thread (T90*10, left-handed). Sealing grooves are provided on the outside of the sealing sections (Ⅰ) and (Ⅱ). A 12mm diameter aluminosilicate refractory fiber rope is wound inside the sealing grooves. The operating temperature is not lower than 1250℃, and the fiber rope is 2mm to 5mm higher than the outer diameter of the thread. The sealing device is used in conjunction with the taphole opening machine and the impact rod. The impact rod is fitted inside the sealing device, with a 500mm extension at the front end serving as a guide rod. The two ends of the sealing device are welded and fixed to the impact rod.

[0004] The advantages of this utility model are: the sealing device has a simple structure and strong practicality; the threaded pressure reducing section can pre-complete the pressure reduction of molten iron and reduce the flow rate; the fiber rope creates conditions for the sealing section (I) and sealing section (II) to fully seal the high pressure and high temperature molten iron; it solves the problems of long time consumption and great impact on furnace conditions caused by manual iron plugging, which is not conducive to the stable production of blast furnace. Attached Figure Description

[0005] Figure 1 This is a diagram of a threaded pressure-reducing sealing device for emergency sealing of blast furnace tapholes.

[0006] Figure 2 This is a schematic diagram of the application scheme for the threaded pressure-reducing sealing device used for emergency sealing of blast furnace tapholes.

[0007] Icon descriptions: Impact rod front guide rod 1, threaded pressure relief section 2, sealing section (Ⅰ)

[0008] 3. Sealing section (II) 4. Protective section 5. Impact rod 6. Opening machine 7. Sealing groove 8. Detailed Implementation

[0009] Example 1

[0010] like Figure 1 As shown, an emergency sealing device for sealing the blast furnace taphole is made of a thick-walled seamless steel pipe with an outer diameter of 140mm and an inner diameter of 38mm. The sealing device is divided into four sections: threaded pressure-reducing section 2, sealing section (I) 3, sealing section (II) 4, and protection section 5. Among them, threaded pressure-reducing section 2 has trapezoidal threads (T70*10, right-handed), sealing section (I) 3 has trapezoidal threads (T80*10, left-handed), and sealing section (II) 4 has trapezoidal threads (T90*10, left-handed). Sealing grooves 8 are provided on the outside of sealing sections (I) 3 and sealing section (II) 4. Alumina silicate refractory fiber rope with a diameter of 12mm is wound in the sealing groove. Its operating temperature is not lower than 1250℃. The wound fiber rope is 2mm to 5mm higher than the outer diameter of the thread, which plays a role in high-temperature sealing.

[0011] like Figure 2 As shown, the sealing device is fitted onto the impact rod 6, with a 500mm pre-reserved length at the front end of the impact rod 6 serving as the front guide rod 1 for the sealing device to enter the iron mouth; the sealing device is welded and fixed to the impact rod 6 at the front and back; when the opening machine 7 starts to rotate forward (left-handed) and move forward, the opening machine 7 drives the impact rod 6, and the front guide rod 1 guides the sealing device to rotate and push it into the iron mouth; the threaded pressure reducing section 2 reduces the pressure of the molten iron through the threaded structure (right-handed thread), reduces the flow rate, and at the same time, it drills into the iron mouth with the sealing device and presses it tightly. The sealing section (Ⅰ) 3 (left-handed thread), the sealing section (Ⅱ) 4 (left-handed thread) and the protection section 5 play a triple sealing role, and finally completely seal the iron mouth.

Claims

1. A threaded pressure-reducing sealing device for emergency sealing of blast furnace tapholes, characterized in that, Made of thick-walled seamless steel pipe, it is divided into four sections: threaded pressure relief section (2), sealing section (I) (3), sealing section (II) (4) and trapezoidal protection section (5); sealing section (I) (3) and sealing section (II) (4) are provided with sealing grooves (8) on the outside, and aluminum silicate refractory fiber rope with a diameter of 12mm is wound in the sealing groove (8), and the fiber rope is 2mm to 5mm higher than the outer diameter of the thread.

2. The threaded pressure-reducing sealing device for emergency sealing of blast furnace tapholes according to claim 1, characterized in that, The threaded pressure reducing section (2) has a trapezoidal thread T70*10, right-handed; the sealing section (Ⅰ) (3) has a trapezoidal thread T80*10, left-handed; and the sealing section (Ⅱ) (4) has a trapezoidal thread T90*10, left-handed. The fiber rope is used at a temperature not lower than 1250℃.

3. The threaded pressure-reducing sealing device for emergency sealing of blast furnace tapholes according to claim 1, characterized in that, The sealing device is used in conjunction with the iron tapping machine (7) and the impact rod (6). The impact rod (6) is fitted inside the sealing device, and a 500mm section is reserved at the front end of the impact rod (6) as a guide rod (1) for the front end of the impact rod. The two ends of the sealing device are welded and fixed to the impact rod (6).

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