Abstract:

To solve the problem that roving strand broken of siro-spinning is difficult to be discovered in time during the process of production, the square wave signal is checked in this paper by using the principle of photoelectric detection,which is caused by the yarn rununing the front of detection probe before and after roving strand broken. There is a clearly difference between each wave signal width values before and after the roving strand broken by the transverse and longitudinal comparison to change features of each wave signal width values, which can be used to judge whether there is a roving break phenomenon .In this paper, experiments spinning the fineness of 29.2 tex combed cotton siro-spinning yarn were carried out on the FA507B spinning frame to validate the conclusion. The results showed that considering the influence of such factors as the yarn thickness, surface hairiness, change of balloon shape, the width of a single square wave increased by 0.3 ~ 0.4 times after roving strand broken. The case of siro-spinning roving strand broken can be indirectly judged by this change, thus it can provide theory bases for subsequent development of siro-spinning roving break stocks detection device.

Key words: siro-spinning, roving strand breaking, square wave, online detection