Die for installing air supply branch pipe equipment of iron-making blast furnace

Abstract

The utility model belongs to the technical field of metallurgical equipment installation, and particularly relates to a mould for installing iron-making blast furnace air supply branch pipe equipment, which is characterized by comprising a mould A and a mould B, the mould A is arranged at a tuyere middle sleeve, the mould B is fixed on an outlet flange of a reducing short pipe, a horizontal guide rod is arranged in the mould A, and the guide rod is positioned on a central line of a tuyere; a vertical guide wire is arranged in the mold B, a plumb bob is tied at the lower end of the guide wire, and when the plumb bob falls on a point C of the center line of the tuyere, the reducing short pipe is aligned; the reducing short pipe and the bustle pipe are continuously welded, the corrugated pipe branch pipe, the gooseneck elbow, the belly pipe and the tuyere large sleeve are sequentially installed between the reducing short pipe and the tuyere medium sleeve, the tuyere small sleeve is arranged in the tuyere medium sleeve, and the blast furnace air supply branch pipe equipment is installed. The utility model has the beneficial effect that the blast furnace air supply branch pipe can be quickly and accurately mounted by virtue of the special mounting mould.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical equipment installation, and particularly relates to a mold for installing the air supply branch pipe equipment of an iron-making blast furnace. Background Art

[0002] The blast furnace air supply device is located on the blast furnace hearth. Its main function is to send the high-temperature hot air generated by the hot blast stove into the blast furnace through the hot air ring pipe, via the air supply device and through the tuyere. Common structures include the Cardan air supply device and the Holven air supply device. Among them, the Cardan air supply device consists of a trumpet pipe, a compound universal hinge type compensator, a gooseneck elbow, a peephole, a straight blowpipe, an upper tensioning device, a lower pressing device, etc. Its main characteristics are: the compensator is composed of two groups of universal hinge type bellows compensators and a section of intermediate pipe. The biggest feature of this compensator is that there is no blind plate force output; the angular displacement combination of the two groups of bellows realizes the displacement in all directions of the entire expansion joint; the internal spherical structure has a small expansion joint and will not change due to displacement. During design, we control the deflection angle within a certain range according to needs, ensuring the best air supply effect of the air supply device and not generating additional forces on the ring pipe and the middle and small sleeves during long-term use. It safely, effectively and with low consumption sends hot air into the blast furnace. It is mainly applied to blast furnaces above 600m 3 above. The structure of the Holven air supply device mainly consists of a trumpet pipe, a compound free type compensator, a gooseneck elbow, a peephole, a straight blowpipe, an upper tensioning device, a lower pressing device, etc. Its characteristic is that the displacement in all directions of the entire compensator can be realized through the axial and radial displacements of the two groups of bellows. It is mainly applied to blast furnaces above 600m 3 above blast furnaces.

[0003] The installation accuracy requirements of the above-mentioned blast furnace air supply branch pipe equipment are high, and the positioning is difficult. Its supporting mold is large in size and heavy in weight, very inflexible to operate, and has low accuracy, seriously affecting the construction speed and quality. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a mold for installing the air supply branch pipe equipment of an iron-making blast furnace, overcoming the deficiencies of the prior art, and realizing the installation of the blast furnace air supply branch pipe equipment with the help of a special installation mold, so as to achieve the technical effects of improving the installation accuracy of the blast furnace air supply branch pipe equipment and accelerating the construction progress.

[0005] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0006] A mold for the installation of the air supply branch pipe equipment of an iron-making blast furnace, characterized in that it includes mold A and mold B. Mold A is arranged at the tuyere intermediate casing, and mold B is fixed on the outlet flange of the reducing short pipe. A horizontal guide rod is provided in mold A, and the guide rod is located on the tuyere center line; a vertical guide wire is provided in mold B, and a plumb bob is tied to the lower end of the guide wire. When the plumb bob falls on point C of the tuyere center line, it means that the reducing short pipe has been adjusted; the reducing short pipe and the hot air manifold are continuously welded, and a bellows branch pipe, a gooseneck elbow, a straight blowpipe and a tuyere large sleeve are sequentially installed between the reducing short pipe and the tuyere intermediate casing. A tuyere small sleeve is provided in the tuyere intermediate casing, and the installation of the blast furnace air supply branch pipe equipment is completed.

[0007] The structure of mold A is dish-shaped, its outer diameter matches the inner diameter of the tuyere intermediate casing, and a through hole is provided in the middle. A guide rod is fixedly arranged in the through hole, and the axis of the guide rod is perpendicular to the bottom surface of the dish shape.

[0008] The structure of mold B includes a flange plate and a hollow guide rod. The mounting holes on the flange plate match the flange holes on the reducing short pipe. The hollow guide rod is fixedly connected to the center of the flange plate. The included angle between the flange plate and the hollow guide rod is the same as the included angle between the center of the reducing short pipe flange and the tuyere center line. A disc is connected to the bottom end of the hollow guide rod.

[0009] A guide wire is provided in the hollow guide rod.

[0010] The diameter of the guide wire is 0.8 - 1.2 mm, and its material is steel wire.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] 1) By means of a special installation mold, the rapid and high-precision installation of the blast furnace air supply branch pipe equipment can be realized, which has the characteristics of being light, flexible in operation and high in precision. The technical effects of improving the installation precision of the blast furnace air supply branch pipe equipment and accelerating the construction progress are achieved during construction.

[0013] 2) After the reducing short pipe is accurately positioned, other parts below the reducing short pipe are sequentially installed, which can fully meet the construction requirements of the conventional blast furnace air supply device, and ensure the quality and safety of the construction operation. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the installation and positioning structure of the embodiment of the present utility model;

[0015] Figure 2 It is a schematic diagram of the structure of mold A in the embodiment of the present utility model;

[0016] Figure 3 It is a schematic diagram of the structure of mold B in the embodiment of the present utility model;

[0017] Figure 4It is a schematic diagram of the hot air manifold, the air supply branch pipe, the furnace shell, and the tuyere structure in the prior art.

[0018] In the figure: 1 - hot air manifold, 2 - reducing short pipe, 3 - corrugated pipe branch, 4 - gooseneck elbow, 5 - straight blowpipe, 6 - tuyere outer sleeve, 7 - tuyere middle sleeve, 8 - tuyere inner sleeve, 9 - blast furnace shell, 10 - guide rod, 11 - flange, 12 - hollow guide rod, 13 - tuyere center line, 14 - guide wire, 15 - disc. Specific embodiments

[0019] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments.

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the specific embodiments required for use in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other specific embodiments can be obtained based on these specific embodiments.

[0021] Generally, the components of the embodiments of the present invention described and shown in the specific embodiments here can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the present invention claimed, but only represents the selected embodiments of the present invention.

[0022] See Figures 1-4 , which is a schematic diagram of an embodiment of the installation method of the air supply branch pipe equipment for an iron-making blast furnace of the present invention. A special installation mold is used to position and install the blast furnace air supply branch pipe on the blast furnace shell 9, improving the installation accuracy of the blast furnace air supply branch pipe. The special installation mold includes mold A and mold B. A wire rack is set corresponding to the tuyere on the blast furnace tuyere platform. The center point is determined on the wire rack using the tuyere center line 13 led out from the blast furnace center. The reducing short pipe 2 is accurately positioned using the mold and then welded. The specific operation steps are as follows:

[0023] 1) A hole for the reducing short pipe is opened on the hot air manifold 1. The reducing short pipe 2 is lifted by a chain hoist and inserted into the hole, making the conical surface of the tuyere middle sleeve 7 and mold A tightly abutted. The tuyere center line is led out from the tuyere middle sleeve 7 using mold A. According to the drawing calculation, the length of line segment n is determined. The projection point C of the flange center of the reducing short pipe 2 on the tuyere center line 13 is found on the led-out tuyere center line according to the length of n.

[0024] 2) Calculate the vertical distance from the center of the flange of the reducing short tube 2 to the center line of the tuyere according to the drawing, and determine the length b of the mold B and the length m of the line segment m to be an integer between 300-500mm for adjustment; the mold A structure is dish-shaped, and its outer diameter matches the inner diameter of the tuyere sleeve 7, with a through hole in the middle, in which a guide rod 10 is fixed, and the axis of the guide rod 10 is perpendicular to the bottom surface of the dish, and the center line 13 of the tuyere must pass through the guide rod 10 from the center of the blast furnace in advance.

[0025] 3) Adjust the position of the short tube 2 on the hot air surrounding pipe 1 so that the center line hammer on the mold B connected to the short tube 2 falls on point C. At this time, when the vertical distance between the bottom of the mold B and the center line of the tuyere is equal to m, it means that the short tube 2 has been adjusted; fix the mold B tightly under the short tube 2, pull out the guide wire 14 from the hollow guide rod 12 on the mold B, and tie the wire hammer to the lower end of the guide wire 14. The distance from the bottom end of the wire hammer to the top of the mold B should be equal to the distance from the center of the flange of the short tube to the center line of the tuyere, that is, L = b + m; use a level to adjust the disc 15 at the lower end of the hollow guide rod 12 to horizontal; during the adjustment process, it should be noted that the disc of the mold B should always remain horizontal. From the Ф10 small hole at the lower end of the steel pipe, it can be checked whether the wire hammer deviates from the center line. Taking a large blast furnace as an example, the air supply branch pipe installation project determines b = 2337mm; m = 500mm; n = 3430mm.

[0026] 4) After the reducing short pipe 2 is accurately positioned, the reducing short pipe 2 is continuously welded to the hot air surrounding pipe 1, and then the bellows branch pipe 3, gooseneck elbow pipe 4, straight blowing pipe 5 and large tuyere sleeve 6 are installed between the reducing short pipe 2 and the tuyere middle sleeve 7 in sequence until the installation of the entire air supply device is completed. A small tuyere sleeve 8 is also installed in the tuyere middle sleeve 7 in advance. The bellows branch pipe 3 and the gooseneck elbow pipe 4 are installed together under the furnace, and after alignment and welding, they are installed under the reducing short pipe.

[0027] The mold B structure includes a flange 11 and a hollow guide rod 12. The mounting hole on the flange 11 matches the flange hole on the reducing short tube 2. The hollow guide rod 12 is fixedly connected to the center of the flange. The angle between the flange 11 and the hollow guide rod 12 is consistent with the angle between the center of the flange of the reducing short tube 2 and the center line 13 of the air outlet. A guide wire 14 is arranged inside the hollow guide rod 12.

[0028] In the embodiment, the guide rod 10 is a Φ17×2.5 mm steel tube. The guide wire 14 is a steel wire with a diameter of 1.0 mm.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold for the installation of the air supply branch pipe equipment of an ironmaking blast furnace, characterized in that, It includes die A and die B. Die A is set at the tuyere middle sleeve, and die B is fixed on the outlet flange of the reducer short pipe. There is a horizontal guide rod in die A, and the guide rod is located on the tuyere center line. There is a vertical guide wire in die B, and a plumb bob is tied to the lower end of the guide wire. When the plumb bob falls on point C of the tuyere center line, it means that the reducer short pipe has been adjusted. The reducer short pipe and the hot air ring pipe are continuously welded. A bellows branch pipe, a gooseneck elbow, a straight blow pipe and a tuyere large sleeve are successively installed between the reducer short pipe and the tuyere middle sleeve. There is a tuyere small sleeve in the tuyere middle sleeve, and the blast furnace tuyere branch pipe equipment installation is completed.

2. The mold for installing the blast pipe equipment of an ironmaking blast furnace according to claim 1, wherein The structure of die A is dish-shaped, its outer diameter matches the inner diameter of the tuyere middle sleeve, there is a through hole in the middle, and a guide rod is fixedly arranged in the through hole, and the axis of the guide rod is perpendicular to the bottom surface of the dish shape.

3. The mold for installing the air supply branch pipe equipment of a blast furnace for ironmaking according to claim 2, characterized in that, The specification of the guide rod is a steel pipe of Φ17×2.5mm.

4. A mold for installing a blast pipe device of a blast furnace for ironmaking, according to claim 3, characterized in that, The matching length of the guide rod and the through hole on die A is 50-70mm.

5. A mold for installing a blast pipe device of an iron-making blast furnace according to claim 1, characterized in that, The structure of die B includes a flange plate and a hollow guide rod. The mounting holes on the flange plate match the flange holes on the reducer short pipe. The hollow guide rod is fixedly connected to the center of the flange plate. The included angle between the flange plate and the hollow guide rod is the same as the included angle between the center of the reducer short pipe flange and the tuyere center line. A disc is connected to the bottom end of the hollow guide rod.

6. A mold for installing a blast pipe device of a blast furnace for ironmaking, characterized in that, There is a guide wire in the hollow guide rod.

7. A mold for installing the air supply branch pipe equipment of a blast furnace for ironmaking, characterized in that, The diameter of the guide wire is 0.8-1.2mm, and its material is steel wire, stainless steel wire or carbon rod.

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