CN217297921U

CN217297921U - Filling structure between impregnated pipes

Info

Publication number: CN217297921U
Application number: CN202220152698.9U
Authority: CN
Inventors: 崔高扬; 张川; 刘永亮; 王忠明; 李勇; 王琼; 王鹏
Original assignee: Anshan He Feng Refractory Material Co ltd
Current assignee: Anshan He Feng Refractory Material Co ltd
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-08-26
Anticipated expiration: 2032-01-20

Abstract

The utility model relates to a filling structure between dip pipe includes fire-resistant stopping, baffle, bottom plate, locating lever, two the dip pipe passes through the flange joint in the RH refining furnace bottom, the locating lever is the both sides that four symmetries set up gap central point between two dip pipes and puts, the upper end and the flange joint fixed connection of locating lever, the bottom plate is fixed in the bottom of locating lever, the baffle joint is in the inboard of locating lever, fire-resistant stopping is filled in the gap between baffle, bottom plate and two dip pipes. The utility model discloses the cost of manufacture is low, easily promotes, can eliminate above-mentioned flooding pipe weak area after filling, reduces the gunning refractory quantity, improves flooding pipe life.

Description

Filling structure between impregnated pipes

Technical Field

The utility model relates to a technical field of refractory material for RH refining and preparation technology thereof especially relates to a filling structure between dip pipe.

Background

The RH vacuum refining technology appeared in the 50 s of the 20 th century, and degassing is the main purpose of the technology, so that the RH refining furnace developed to the present day becomes an external refining device mainly used for degassing, deep decarburization, desulfurization, alloy adjustment and heating, and is mixed with the materials. During the production process of the RH refining furnace, a pair of dip pipes positioned at the bottom of the equipment are inserted into molten steel, the molten steel is lifted into the RH refining furnace through a lifting pipe by lifting gas to carry out refining operations such as degassing, decarburization and the like, and then the molten steel is refluxed into a ladle through a descending pipe. In the refining process of the repeated circular flow of the molten steel, the interior of the dip pipe is subjected to long-time airflow and high-speed scouring of the molten steel, and the exterior castable is subjected to erosion of molten steel surface slag and impact of huge thermal stress caused by rapid cooling and rapid heating due to periodic operation, so that the working environment is very severe. Therefore, the service life of the dip pipe can directly restrict the service life of the whole RH refining furnace refractory and the production rhythm of a steel mill, and the service life of the dip pipe is generally prolonged by adopting gunning materials to perform gunning maintenance on the used dip pipe at present. The spray repair maintenance of the castable of the outer layer of the dip pipe mainly depends on a mechanical outer spray gun or a manual handheld outer spray gun for maintenance operation.

Because the outer diameter of the dip pipe is large, the distance between the two butting flanges is relatively small, a section of narrow gap is left between the two butted pipes, the castable in the area is subjected to slag erosion and molten steel scouring simultaneously in the refining process, but the mechanical outer spray gun is limited by the stroke limit, the area cannot be effectively sprayed and maintained, and when the handheld outer spray gun is used for maintenance, the spraying angle is too large, so that the spraying material is greatly rebounded and wasted.

Overall, neither outer lance can efficiently maintain it, making it a weak area of dip tube life. Therefore, the research on how to fill the weak area and eliminate the hidden trouble is of great significance to save the amount of gunning materials and prolong the service life of the dip pipe.

Patent document CN 103103315 a discloses an integrated dip pipe of RH vacuum refining device, in which the bottom of the lower tank inevitably generates downward deformation under high temperature load during use, and the deformation is reduced from the center of the bottom of the tank to the side wall, resulting in the passive generation of deformation in the center of the bottom of the tank and in the direction of the wall of the tank. The flanges of the ascending pipe and the descending pipe are fixed on the same plane, so that the situation that one side of the dip pipe is successfully butted and the other side of the dip pipe cannot be butted possibly occurs when the deformed flange plate is butted.

SUMMERY OF THE UTILITY MODEL

The utility model provides a filling structure between impregnated tube, the cost of manufacture is low, easily promotes, the utility model discloses can eliminate above-mentioned impregnated tube weak area, reduce the gunning refractory quantity, improve impregnated tube life.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the filling structure between the dip pipes comprises a fireproof filling material, a baffle plate, a bottom plate and positioning rods, wherein the two dip pipes are connected to the bottom of an RH refining furnace through a butt flange, the four positioning rods are symmetrically arranged on two sides of the center of a gap between the two dip pipes, the upper end of each positioning rod is fixedly connected with the butt flange, the bottom plate is fixed to the bottom of the positioning rod, the baffle plate is clamped on the inner side of the positioning rod, and the fireproof filling material is filled in the gap between the baffle plate, the bottom plate and the two dip pipes.

The baffle is a metal plate or a wood plate with the thickness of 2-5 mm.

The bottom plate is a metal plate with the thickness of 2-5 mm.

The positioning rod is a metal rod, and the diameter of the positioning rod is phi 5-phi 8 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the utility model has the advantages that the gap between the ascending pipe and the descending pipe is poured with the fireproof filling material, thereby directly eliminating the weak area of gunning, reducing the dosage of gunning material, improving the gunning efficiency and being beneficial to ensuring the compact production rhythm of a steel mill;

2) the utility model belongs to a reinforcement measure for the castable of the outer layer of the dip pipe, which improves the service life of the dip pipe;

3) the utility model discloses preparation simple process, it is with low costs, easily promote.

4) The utility model discloses a split type dip pipe is after docking with RH stove flange respectively, and the packing of going on between bipartite formula dip pipe can avoid warping the problem that can't dock because of the butt joint flange.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an exploded view of the filling structure of the present invention.

In the figure: 1-fireproof filling material, 2-baffle, 3-bottom plate, 4-positioning rod, 5-immersion tube and 6-butt flange.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

referring to fig. 1-2, the filling structure between the dip pipes comprises a refractory filler 1, a baffle 2, a bottom plate 3 and a positioning rod 4, wherein the two dip pipes 5 are connected to the bottom of the RH refining furnace through a butt flange 6, the positioning rod 4 is four and symmetrically arranged at two sides of the center of a gap between the two dip pipes 5, the upper end of the positioning rod 4 is fixedly connected with the butt flange 6, the bottom plate 3 is fixed at the bottom of the positioning rod 4, the baffle 2 is clamped at the inner side of the positioning rod 4, and the refractory filler 1 is filled in the gap between the baffle 2, the bottom plate 3 and the two dip pipes 5.

The baffle 2 is a metal plate or a wood plate with the thickness of 2-5 mm.

The bottom plate 3 is a metal plate with the thickness of 2-5 mm.

The positioning rod 4 is a metal rod with the diameter of phi 5-phi 8 mm.

Example 1:

the baffle 2 uses a 2.5mm thick steel plate, the bottom plate 3 uses a 2.5mm rear steel plate, and the positioning rod 4 uses phi 6mm round steel.

After the dip pipes 5 are installed in a butt joint mode, the bottom plate 3 is placed in the center position between the two dip pipes 5, and the upper surface of the bottom plate 3 is attached to the lower surfaces of the dip pipes 5; welding the lower end of the positioning rod 4 and the bottom plate 3 at one position by using a handle welding; welding the upper end of the positioning rod 4 and the immersion pipe butt flange 6 at one position by using hand welding; the baffle 2 is attached to the outer surface of the dipping pipe 5 in the direction parallel to the central line of the two dipping pipes 5, and the bottom edge of the baffle is completely attached to the upper surface of the bottom plate 3; the baffle plate 2 and the bottom plate 3 are welded together by using a hand welding.

Stirring on site: adding the refractory filler into a stirrer, and dry-mixing for 1 min; adding water, the water addition amount is 4.8% of the total weight of the mixed refractory filler in the mill, and mixing for 3min after adding water.

Pouring: and pouring the mixed refractory filler into the gaps of the manufactured baffle, the bottom plate and the two dip pipes.

Health preserving: after the pouring is finished, the refractory filling material is naturally cured for 8 hours in an environment of 20 ℃, and enters a baking position along with the dip pipe to be baked for 48 hours for online use.

Physical indexes of the refractory filler are as follows: after baking for 24h at 110 ℃, the bulk density reaches 3.02g/cm 3; the apparent porosity is 15.8%; the compressive strength is 45 Mpa; the breaking strength is 6.2 Mpa; the stripping phenomenon does not occur after the thermal shock is carried out for 15 times at 1100 ℃.

The implementation effect is as follows:

in the embodiment 1, the refining furnace 150tRH of a certain steel mill in Jiangsu and the refining furnace 180tRH of a certain steel mill in Liaoning have good use effects, the service life of the refining furnace respectively reaches more than 85 furnaces and 75 furnaces, the spray repair material is saved by more than 2t for each pair of dip pipes on average, the time for spray repair maintenance of each furnace is shortened by more than 2min on average, and the phenomenon of steel leakage of the dip pipes at the position is avoided.

Claims

1. The filling structure between the dip pipes is characterized by comprising a fireproof filling material, a baffle plate, a bottom plate and a positioning rod, wherein the two dip pipes are connected to the bottom of an RH refining furnace through a butt flange, the positioning rod is four sides symmetrically arranged at the center of a gap between the two dip pipes, the upper end of the positioning rod is fixedly connected with the butt flange, the bottom plate is fixed to the bottom of the positioning rod, the baffle plate is clamped on the inner side of the positioning rod, and the fireproof filling material is filled in the gap between the baffle plate, the bottom plate and the two dip pipes.

2. A dip tube interjacent packing structure as claimed in claim 1, wherein the baffle is a 2-5mm thick metal or wood plate.

3. A dip tube intermediate packing structure as recited in claim 1, wherein said bottom plate is a 2-5mm thick metal plate.

4. The structure of claim 1, wherein the positioning rod is a metal rod having a diameter of 5-8 mm.