Analysis And Measuring The Axis Of Rotary Kiln In Dynamic Based On 3-point Method Of Total Station

Rotary kiln is the kernel producing equipment of metallurgy, chemical industry, architecture material etc. The operating character is of kiln is running extendedly and continually over more supporting points. And the straightness and precision of the axis is the very important condition to guarantee the kiln operating by rule and line. But after a period time of working,the position and straightness of the kiln will be influence by several things like:different subsidence depth of the supporting frusta,imprecise adjusting of the supporting wheel,abrasion of the equipment,even crack the canister and shorten the kiln shell's life.So it's necessary and very important to detect the axis periodically.And dynamic measuring of the axis of rotary kiln will not only avoid the huge financial loss,but also give preventive maintenance to the kiln and keep it from suddenly stop accident.This paper describes the importance of the axis of rotary kiln for the whole production line, as well as the advantages and necessity of dynamic detection of the kiln shell axis. Meanwhile, making a depth understanding and analysis on the detection technology of the kiln axis at home and abroad, and presented a method of dynamickiln shell axis measurement based on the principle of 3-point of total station. The measuring principle of this method:measuring the points's location on the surface of type, and using least square method to fit the circular curve on the surface of type, resulting in the rotation center of type. Combined with the measured type diameter and the clearance between type and shell, then the shell rotation center can be calculated, making each pier shell rotation center in the same coordinate system, the shell axis variation will be seen visually. This method largely reduced the operation time on the kiln based on meeting the measuing precision, avoide directly face to the heat radiation and vibration caused by the kiln, increasing the safety of operating personnel and measuring accuracy.This article focuses on the cacuracy analysis of the 3-point method measurement, and found two factors affecting the measurement precision:measuring point precision and the location distribution of measurement points. And detailed analyze the distribution of measurement points influence on the measuring accuracy, realized that the uniorm distribution of measurement points can reduce the measurement error, and given the optimal location of measurement points distribution in this method. In data processing, using the least square method to fit the measuring points location on the surface of type, and compared with the traditonal data processing method, it is obvious that the least square method is better to fit the circular curve on the surface of type. Finally, developed the application based on LABVIEW, which includes a GUI front panel and data flow procedures rear panel. Using the GUI front panel can control the measurement start and stop, and complete the circular curve fitting and other data processing. In order to observe the result intuitively for the user, the application can draw the kiln axis state diagram automatically. For a more complete measurement, the application also integrates historical inquiry, report generation and other functions.