Research On Automated Technologies Of Inspecting And Machining Spinneret For Melt-Spun Nonwoven

At present, domestic factories are mainly relying on manual operation to inspect the spinneret for melt-spun nonwoven. There are drawbacks such as poor accuracy, great labor-intensity, low efficiency, high omission and mistake factor. An automatic inspection system has been produced abroad. However, it is costly and its function is still imperfect. Hence it is urgent to develop an automatic inspection system of high accuracy and speed.At the same time, there is not sufficient research on automated machining spinneret for melt-spun nonwoven at domestic and abroad. The automatic machining equipment has not been developed yet. Therefore, it will promote the level by researching the technology of automated machining spinneret for melt-spun nonwoven.This paper centered on developing an auto-inspection system, and researched into "the technology of micropore’s image processing," "the auto-location algorithm and the auto-inspection sequence", "auto-focusing technology to the deformed spinneret", "software and hardware design of auto-inspection system". Including:Firstly, it introduced the common inspection methods of spinneret for melt-spun nonwoven, development status of domestic and abroad auto-inspecting technology as well as its key technologies.Secondly, it researched on the key algorithms of circular micropore’s image processing. Such as IMAQ, digitization, median filter, thresholding, edge extracting, arc center probing, characteristic parameters calculation.Thirdly, it expounded the "eccentric" phenomenon and its common solutions. Then it put forward algorithms of auto-correction and auto-seeking for micropore’s image, and realized the aim of higher efficiency and higher accuracy auto-location.Fourthly, it analyzed the auto-movement sequence by researching the permutations regularity of micropores at the rectangle spinneret for melt-spun nonwoven. And established the "firstly row then column" auto-movement sequence to realize the aim of higher efficiency and higher accuracy auto-inspection.Fifthly, it studied auto-focusing technology based on the adaptive fuzzy controlling theory. It initially described the inspecting problems at the deformed spinneret, and analyzed the demerits of current solution by auto-focusing every micropore. After studying the deformed regularity of rectangle non-woven spinneret and a method of auto-focusing technology based on entropy function, it brought forward two solutions based on setting the fixed times of auto-focusing. Lastly put forward a method of adaptive fuzzy controlling the times of auto-focusing, and solved the problem that the image collected was penumbra at the deformed spinneret.Finally, it elaborated on developing the auto-inspection system, including the mechanism design, hardware selection, using Lab VIEW programming the software for inspection. After above researches, it succeeded in manufacturing an auto-inspection device of which the duplicate inspection precision is 1μm and the average time of inspecting a micropore is no more than 2 seconds.For studying the technology of automated machining spinneret for melt-spun nonwoven, it firstly studied the current machining technology. And then it put forward a processing program of auto-machining the micropore from the exit side based on machine vision technology.The results of the afore-mentioned studies, it firstly realized the auto-inspection the spinneret for melt-spun nonwoven at the domestic, and provided the technical preparation for developing an auto-machining device.