Surfacing welding type roller shell of bowl type coal mill and sectional surfacing welding method of roller shell surfacing welding layer

Abstract

The invention discloses a surfacing welding type roller shell of a bowl type coal mill, the surfacing welding type roller comprises a tapered roller shell parent body, a large end and a small end of the tapered roller shell parent body are respectively provided with an annular bulge, the height of the annular bulge at the large end is greater than the height of the annular bulge at the small end; the outer surface of the roller shell parent body is provided with a roller shell surfacing welding layer, the roller shell surfacing welding layer extends from the annular bulge at the large end to the annular bulge at the small end; the roller shell surfacing welding layer is divided into four sections, the sum of the axial size of a first surfacing welding section located at the large end of the tapered roller shell parent body and the annular bulge at the large end accounts for 1 / 3 the axial size of the roller shell parent body. According to the practical roller shell wearing characteristics of the bowl type coal mill during grinding of raw coal containing more coal ores, pyrite, quartz sand and the like, the shape of the roller shell surfacing welding layer can be inrationally determined, and by use of a sectional surfacing welding method, the wear resistance of a surfacing material can be fully exerted, and the service life of the roller shell wear parts of the bowl type coal mill can be effectively improved. The invention also discloses the sectional surfacing welding method of the roller shell surfacing welding layer.

Description

Technical field [0001] The invention relates to a bowl-type coal mill, in particular to a surfacing type roller sleeve of a bowl-type coal mill. The invention also relates to a sectional surfacing method for the surfacing type roller sleeve of the bowl coal mill. Background technique [0002] At present, the world is facing a situation of energy shortage, and thermal power generation accounts for a considerable proportion of the energy structure. [0003] The bowl-type coal mill in thermal power generation equipment needs to use surfacing roller sleeves. The existing surfacing roller sleeves are such as figure 1 As shown, a tapered roller sleeve matrix 1 is included, and the outer surface of the roller sleeve matrix 1 is provided with a roller sleeve overlay 2. For the surfacing type roller sleeve of this structure, the surfacing layer 2 of the roller sleeve adopts a bimetal composite hard-surface surfacing method, so that the surfacing layer 2 of the roller sleeve directly covers...

AI Technical Summary

Problems solved by technology

[0004] In the process of use, due to the extrusion of different low-quality coal and the surface of the roller sleeve, wear occurs, which makes the utilization rate of the surfacing layer of the roller sleeve low and the service life of the roller sleeve is short.

[0005] In addition, the existing method of double-metal composite hard-surfacing welding is extremely difficult to manufacture, which is likely to cause poor fusion and compatibility of welding materials, and cannot meet the expected wear-resisting service life requirements

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