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Stress reduction for pulverizer main shaft via flexible structure

A flexible and flexible device technology, applied in the field of coal crushers, can solve problems such as insignificant remedial effects and fatigue failure of the main shaft

Inactive Publication Date: 2009-04-22
THE BABCOCK & WILCOX CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of remediation is not significant, and even a carefully fitted conical joint is subject to frequent fatigue failure of the main shaft due to gnawing and stress at the joint of the main shaft and yoke sleeve due to cyclic bending forces

Method used

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  • Stress reduction for pulverizer main shaft via flexible structure
  • Stress reduction for pulverizer main shaft via flexible structure
  • Stress reduction for pulverizer main shaft via flexible structure

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Embodiment Construction

[0032] Referring to the corresponding drawings, there are several identical or functionally similar components in the several drawings. In the arrangement of the present invention, it is mainly axial loads parallel to the vertical axis of the coal crusher main shaft that are dealt with.

[0033] The main purpose of the present invention is to prolong the service life of the main shaft and reduce the failure of the main shaft. A flexible yoke casing is arranged in the steel ball seat ring type coal crusher. figure 1 Illustrated in the existing disclosed steel ball seat ring type coal crusher 10, the lower part or bottom of the coal crusher 10 is provided with a grinding ring 12 installed and fixed (by keys or similar components) on the ring seat 44, The ring seat 44 is installed and fixed on the coal crusher yoke 18 . However, the present invention is not limited to having a lower or bottom grinding ring 12 on the pulverizer 10 . The present invention can also be applied to s...

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Abstract

The invention relates to a stress reduction for a pulverizer main shaft via a flexible structure. A yoke bushing reduces the cyclic movement between the main shaft of a ball-and-race type coal pulverizer, thereby resulting in longer shaft life and reduced incidences of shaft failure. The yoke bushing is comprised of a flexible structure that provides individual contact areas which will have, at the same locations, equal stress fields between the main shaft and the yoke bushing.

Description

technical field [0001] The present invention relates generally to the field of coal pulverizers, and in particular to improvements in reducing stress to prolong the life of the main shaft of a steel ball race coal pulverizer and reduce the occurrence of main shaft damage failures. Background technique [0002] The coal pulverizer is used to grind, dry and classify unprocessed large coals into fine solids, which can be fluidized and filled into burners for combined use and / or industrial boilers or kilns. Several different types of coal crushers or pulverizers are known to those skilled in the art, including the well-known EL type crusher produced by Babcock and Wilcox as early as 1950. Coal machine, this is a steel ball seat ring type coal crusher that uses the principle of thrust ball bearings to crush coal. [0003] figure 1 and 1A A coal pulverizer 10 of the prior art type EL is shown with an upper shell portion 32 and a lower shell portion 34 . Lower housing portion 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C15/00
CPCB02C15/006F16C27/00B02C15/12Y10T403/7047
Inventor W·N·马丁R·D·米扎克A·E·杰克逊
Owner THE BABCOCK & WILCOX CO