Galvanized wire is divided into hot dipped galvanized wire and cold galvanized wire (Electro Galvanized Wire). Galvanized wire has good toughness and flexibility, the maximum amount of zinc can reach 350 g /sqm. With zinc coating thickness, corrosion resistance and other characteristics. Galvanized Wire,Steel Iron Wire,Galvanised Mesh,Electro Galvanized Welded Shenzhou City Hongda Hardware Products Co.,Ltd , https://www.hdgabion.com
Improper design, poor dynamic characteristics, forced vibration or self-excited vibration during operation, irrational structure, stress concentration design work speed close to or falling into the critical speed zone, thermal expansion volume is not calculated, resulting in poor thermal centering
2. Manufacturing reasons:
Poor parts processing, poor accuracy, poor part material quality, insufficient strength, manufacturing defects Rotor dynamic balance does not meet technical requirements
3. Installation reason:
Improper mechanical installation, misalignment of components, misalignment of pre-loaded large-shaft systems, misalignment of the machine's geometric parameters (such as fit clearance, interference, and relative position). Pipe stress is high, and the machine changes the dynamic characteristics and installation accuracy of the rotor during operation. Improper positioning for a long time, changes in the accuracy of the dynamic balance were not overhauled, and the original compatibility and accuracy of the machine were damaged.
4 improper operation:
Process parameters (such as medium temperature, pressure, flow rate, load, etc.) deviate from the design value, and the machine operating conditions are not normal. The machine runs at super-speed and overload, changing the operating characteristics of the machine. The operating point is approaching or falling into the critical speed zone. Lubrication or poor cooling. Partial rotor damage or scaling. Improper operation due to shutdown or downshifting. Insufficient warming, uneven thermal expansion, or excessive residence time in critical areas.
5. Equipment deterioration:
In long-term operation, the rotor deflection increases or the dynamic balance deteriorates. Part of the rotor is damaged, detached, or cracks occur. Component wear, pitting, corrosion, etc. The mating surface is degraded, resulting in insufficient or loose interference, destroying the mating property and accuracy. Uneven settlement, deformation of the machine shell.
Various causes of fan failure
1. Design reason: