Impulse wheel of fan coal grinding mill using casting-forging welding device

Abstract

The invention provides a fan coal grinding mill impulse wheel having a casting-forging welding structure in the industry of a heat power plant firing brown coal. The whole device consists of a front disk, a back disk, a beating plate and a connecting beam, wherein the front disk and the back disk are connected by the connecting beam; the beating plate is arranged on the connecting beam; the front disk adopts a three-forging steel plate welding structure; the back disk is welded with three forging steel plates and then welded with a forging hub; the material of the front disk is 9NiMo5,the material of the wheel disk of the back disk is 9NiMo5, and the material of the hub is ZG20MnV; the strength value of the material of 9NiMo5 is 335MPa at a temperature of 350 DEG C; and the strength value sigma s of the material of ZG20MnV is 220MPa at a temperature of 350 DEG C. The device has the advantages of good quality of the casting-forging welding structure of an impact wheel, high strength, reasonable structure, strong manufacturability, low manufacturing cost, large safety factor, high safety on the use of the equipment, light weight of the impact wheel, small rotary inertia, short starting time of the fan coal grinding mill, low starting energy consumption of a motor, little shock effect on a power grid and short idling time.

Description

Technical field: [0001] The invention relates to an impact wheel of a fan coal pulverizer adopting a cast forging and welding structure in the thermal power plant industry burning lignite. Background technique: [0002] At present, with the large-scale assembly capacity of domestic thermal power generators, large-scale fan coal pulverizers are required for lignite-burning thermal power plants, and the diameter of the impact wheel has reached more than φ3500mm, which increases the design and manufacturing process for the manufacture of large-scale impact wheels difficulty. The traditional impact wheel disc is a casting structure. When the impact wheel rotates at high speed, the centrifugal force of the connecting beam and the striking plate acts on the front and rear discs. In order to adapt to the erosion and wear of coal, the thickness of the striking plate of the impact wheel is large, and the mass of the striking plate is concentrated on the edge of the wheel, which has ...

AI Technical Summary

Problems solved by technology

Increase the casting cost of the wheel itself and delay the production cycle

It is known that domestic large-scale foundry companies cannot guarantee the casting quality 100%, especially for large-diameter roulettes, it is even more difficult to achieve

The large-diameter wheel is difficult to realize in the casting process, and the scrap rate is high, and the allowable stress is 20-30% lower than that of forgings.

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