JPH0756076B2 - Lining method of the inner surface of the casing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lining the inner surface of a casing of a dust collector or the like.

[0002]

2. Description of the Related Art Since the inner surface of the casing of a dust collector or blower handling a gas containing abradable dust is liable to be unevenly worn or punctured due to wear, it may lead to a decrease in operating efficiency and environmental pollution. Is. As one of the countermeasures, Japanese Utility Model Laid-Open No. 57-40695 discloses a structure in which a liner mounting seat is provided on the inner surface of a casing and a wear preventing liner is fixed to the liner mounting seat.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The technology of No. 695 is for facilitating the work of replacing the liner, and is not a technology for reducing the wear of the liner. Therefore, replacement of the liner occurs at the same frequency as in the past, and it is not sufficient in terms of improving the operating efficiency of the blower and the dust collector.

[0004]

The present invention has been made in view of the above-mentioned problems of the prior art, in which a steel sheet is cut to clean its surface, and then N is used as an undercoat.
i is sprayed, and the top layer is made of Ni,
Cr-containing WC spraying, WC spraying of the second layer to form three sprayed layers, further heating with gas flame, and then bending with a roller to produce a liner. A lining method for a casing inner surface is characterized in that a liner is attached to the casing inner peripheral surface by welding.

[0005]

In the liner according to the present invention, three sprayed layers are formed, which are subjected to fusing treatment by heating with a gas flame, and then subjected to bending by a roller to also serve as strain relief.
The peeling resistance and abrasion resistance of the sprayed layer are significantly improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view for explaining an embodiment of the present invention. The present invention was carried out in the following steps as shown in FIG.

(1) Cutting of Steel Plate 1500 mm × 1000 mm Steel Plate 1 (S
Six sheets of S41) were prepared.

(2) Blasting A blast machine 2 was used to clean the surface of the steel sheet 1 by blowing alumina + flux.

(3) Three layers were sprayed by the spray gun 3.

1) Undercoat (Ni: 78%, C
r: 22%) ... 0.1 mm thick 2) First layer of topcoat (Ni: 20%, Cr: 20%)
Contained WC: 60%) ... 0.3 mm thick 3) Second layer of top coat (WC: 60%) ... 0.6 mm
Table 1 shows the spray gun set values for construction technology.

[0011]

[Table 1]

(4) Using the fusing burner 4, the steel plate 1 after thermal spraying was heated with a gas flame. Heating temperature 1000 ° C ± 50 ° C.

(5) Bending process A liner 1A was manufactured by performing a bending process (R = 2 m) that also serves as strain relief by the three rollers 5 and the backup plate 8.

(6) Welding Joining 6 liners 1A as shown in FIG.
It was attached to the inner surface of the upper casing 6A. FIG. 3 shows the entire casing 6. Welding was performed using mild steel as the lower deposit and WC as the upper deposit.

When the dust collector casing 6 lined as described above is used as a ventilation dust collector for iron making equipment, the life of the casing is improved by about 6 times as compared with the conventional one. The liner 1A is provided in the upper casing 6A that is most susceptible to the wind pressure and dust. In the figure, 7 is a runner.

In the present invention, the undercoating of Ni is applied to enhance the adhesion between the steel sheet and the topcoat, and a Ni content of 78% was used. The higher the Ni content, the better. Thickness is 0.1mm ± 0.0
It is desirable to set it to 5 mm. Top coat first layer WC
Considers adhesion, Ni: 10% or more, Cr: 10-3
It is desirable that the WC content is 0% and the rest is WC, and the WC content is 50% or more, and the thickness is desirably 0.3 mm ± 0.1 mm. The WC content of the second layer of the top coat is 60
%, The thickness is preferably 60% or more from the viewpoint of wear resistance, and the thickness is preferably 0.5 mm or more.

[0017]

As described above, according to the present invention, it is possible to prevent wear and breakage of the inner surface of the casing due to dust-containing gas, and to significantly extend the life of the casing, which leads to a reduction in operating efficiency and environmental pollution. And the remarkable effects such as reduction of repair cost can be achieved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example of the present invention.

FIG. 2 is a perspective view showing how a liner according to the present invention is attached.

FIG. 3 is a perspective view showing a casing according to the present invention with a partial cross section.

[Explanation of symbols]

 1 ... Steel plate 2 ... Blasting machine 3 ... Thermal spray gun 4 ... Burner 5 ... Roller 6 ... Casing 6A ... Upper casing 7 ... Runner 8 ... Backup plate

Claims (1)

[Claims] 1. A steel sheet is cut and its surface is cleaned, and then Ni is sprayed as an undercoat, and a top layer is WC sprayed with Ni and Cr as a first layer and a WC sprayed as a second layer. A three-layer sprayed layer is formed on the casing, and after heating with a gas flame, the liner is manufactured by bending it with a roller, and a plurality of these liners are attached to the inner peripheral surface of the casing by welding. Inner lining method.