Ejector rod device for preventing bending loss of tuyere small sleeve of blast furnace

Abstract

The utility model relates to the technical field of blast furnace ironmaking, in particular to an ejector rod device for preventing a blast furnace tuyere small sleeve from bending damage, which comprises a blast furnace shell, a tuyere small sleeve and a seamless steel tube, and the tuyere small sleeve is provided with a groove and is tightly attached to the left side of the seamless steel tube; a fixing steel plate is welded to the right side of the blast furnace shell and fixedly connected with the seamless steel pipe through puller bolts, and meanwhile springs and check blocks for limiting movement of the springs are arranged on the right sides of the puller bolts and the fixing steel plate. The seamless steel pipe is small in size, light in weight and convenient to replace and maintain; secondly, the fastening degree of the whole device to the tuyere small sleeve can be conveniently adjusted through the tightness degree of the fixing nut; and thirdly, the seamless steel pipe penetrates into the end face groove of the small sleeve, and does not displace when being fixed in position and stressed.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace ironmaking, in particular to a push rod device for preventing the bending damage of a blast furnace tuyere small sleeve. Background Technique

[0002] The blast furnace tuyere small sleeve needs to continuously and stably work in an environment of high blast temperature and high blast pressure, and is also accompanied by lower erosion of molten slag iron and upper pressure bearing of slag skin shedding, etc. The working environment is extremely harsh. Moreover, with the improvement of the blast furnace smelting intensity, the fluctuation of raw fuel conditions, and the cyclic enrichment of harmful elements in the furnace, the bending damage of the tuyere small sleeve occurs from time to time. The bending damage of the tuyere small sleeve will cause the angle change of the tuyere small sleeve, resulting in the change of the gas flow in the blast furnace, and ultimately affecting the stable and smooth operation of the blast furnace condition. In addition, the bending damage of the tuyere affects the tuyere injection, restricts the implementation of coal injection and coke saving, and in severe cases, it may even cause the tuyere small sleeve to leak air and turn red, and finally burn out the tuyere small sleeve, resulting in a major safety accident of tuyere breakage.

[0003] A blast furnace tuyere small sleeve external auxiliary fastening device with the patent number of CN202221142683.0 of the company includes an arc-shaped top head, a main beam, a reinforcing rib, a right-angle elbow, a bolt hole, a bolt, a pin hole and a wedge-shaped pin. The arc-shaped top head is installed at the left end of the main beam, the right-angle elbow is installed at the right end of the main beam, the right-angle long side of the reinforcing rib is installed on the main beam, the right-angle short side of the reinforcing rib is installed on the right-angle elbow, the bolt hole is opened at the lower part of the right-angle elbow, and the pin hole is opened at the right end of the bolt. The utility model can externally strengthen and fasten the blast furnace tuyere small sleeve, plays a positive and effective role in dealing with special situations of tuyere sinking and tuyere upward warping, effectively reduces the situation of tuyere air leakage caused by tuyere sinking or upward warping, and improves the safety factor of blast furnace production.

[0004] However, there are the following disadvantages: First, due to the installation position being in the area below the blowpipe and the heavy girder, it is not conducive to replacement and maintenance; second, in the existing scheme, the wedge-shaped pin is inserted into the pin hole for fastening, and the phenomenon of pin loosening is likely to occur in actual production; third, when the arc-shaped top head is installed, it is easy to have a situation where it is not completely attached to the small sleeve end face, and the force displacement affects the fixing effect. Summary of the Invention

[0005] The purpose of the utility model is to provide a push rod device for preventing the bending damage of a blast furnace tuyere small sleeve, so as to solve the problems existing in the above background technique.

[0006] To achieve the above object, the present utility model provides the following technical solution: A push rod device for preventing the bending damage of the small tuyere sleeve of a blast furnace, comprising a blast furnace shell 1, a small tuyere sleeve 8 and a seamless steel pipe 7, characterized in that: The small tuyere sleeve 8 is provided with a groove 8-1 and is closely attached to the left side of the seamless steel pipe 7; A fixed steel plate 2 is welded to the right side of the blast furnace shell 1 and is fixedly connected to the seamless steel pipe 7 through a tightening bolt 3. At the same time, a spring 4 and a stop block 9 for restricting the movement of the spring 4 are provided on the right side of the tightening bolt 3 and the fixed steel plate 2, and the stop block 9 is fixed to the tightening bolt 3 through a pin 10.

[0007] Preferably, a fixing nut 6 cooperating with the tightening bolt 3 is welded to the right side of the seamless steel pipe 7.

[0008] Preferably, a gasket 5 is provided between the spring 4 and the fixed steel plate 2.

[0009] Preferably, the center lines of the openings of the seamless steel pipe 7, the tightening bolt 3 and the fixed steel plate 2 coincide.

[0010] Preferably, the fixed steel plate 2 is perpendicular to the installation surface of the small tuyere sleeve 8.

[0011] Compared with the prior art, the beneficial effects of the present utility model are: First, the seamless steel pipe is small in volume and light in weight, and is convenient for assembly and disassembly, facilitating replacement and maintenance; Second, the tightening degree of the entire device on the small tuyere sleeve can be conveniently adjusted through the tightness of the fixing nut, and the fixing effect is good without displacement and loosening; Third, the seamless steel pipe penetrates into the groove at the end face of the small sleeve, and the position is fixed without displacement when stressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural schematic diagram of the present utility model.

[0013] In the figure: 1, blast furnace shell; 2, fixed steel plate; 3, tightening bolt; 4, spring; 5, gasket; 6, fixing nut; 7, seamless steel pipe; 8, small tuyere sleeve; 8-1, groove; 9, stop block; 10, pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Please refer to Figure 1, the present utility model provides a technical solution: a push rod device for preventing the bending damage of the small tuyere sleeve of a blast furnace, comprising a blast furnace shell 1, a small tuyere sleeve 8 and a seamless steel pipe 7, characterized in that: the small tuyere sleeve 8 is provided with a groove 8-1 and is closely attached to the left side of the seamless steel pipe 7; a fixed steel plate 2 is welded to the right side of the blast furnace shell 1 and is fixedly connected to the seamless steel pipe 7 through a tightening bolt 3. At the same time, a spring 4 and a stop block 9 for restricting the movement of the spring 4 are provided on the right side of the tightening bolt 3 and the fixed steel plate 2, and the stop block 9 is fixed to the tightening bolt 3 through a pin 10; a fixed nut 6 cooperating with the tightening bolt 3 is welded to the right side of the seamless steel pipe 7, and the tightening degree of the whole device on the small tuyere sleeve can be adjusted according to requirements, and the spring 4 on the right side can prevent the tightening bolt 3 from loosening.

[0016] A gasket 5 is provided between the spring 4 and the fixed steel plate 2 to prevent the spring 4 from wearing the fixed steel plate 2.

[0017] The center lines of the openings of the seamless steel pipe 7, the tightening bolt 3 and the fixed steel plate 2 coincide, and the fixed steel plate 2 is perpendicular to the installation surface of the small tuyere sleeve 8, avoiding non-concentricity and improving the efficiency of assembly and disassembly.

[0018] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A push rod device for preventing the bending of a blast furnace tuyere sleeve, comprising a blast furnace shell (1), a tuyere sleeve (8) and a seamless steel pipe (7), characterized in that: The tuyere sleeve (8) is provided with a groove (8-1) and is tightly fitted with the left side of the seamless steel pipe (7); a fixed steel plate (2) is welded on the right side of the blast furnace shell (1) and is fixedly connected to the seamless steel pipe (7) by a tightening bolt (3); at the same time, a spring (4) and a stopper (9) for limiting the movement of the spring (4) are provided on the right side of the tightening bolt (3) and the fixed steel plate (2); the stopper (9) and the tightening bolt (3) are fixed by a latch (10).

2. A push rod device for preventing the bending of a blast furnace tuyere sleeve according to claim 1, characterized in that: A fixing nut (6) matched with the tightening bolt (3) is welded on the right side of the seamless steel pipe (7).

3. A push rod device for preventing the bending of a blast furnace tuyere sleeve according to claim 1, characterized in that: A gasket (5) is provided between the spring (4) and the fixed steel plate (2).

4. A push rod device for preventing the bending of a blast furnace tuyere sleeve according to claim 1, characterized in that: The center lines of the seamless steel pipe (7), the tightening bolt (3) and the opening of the fixing steel plate (2) coincide with each other.

5. A push rod device for preventing the bending of a blast furnace tuyere sleeve according to claim 1, characterized in that: The fixed steel plate (2) is perpendicular to the installation surface of the air outlet sleeve (8).

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