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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
E-mail:
meem_contribute@163.com
Abstract: Aiming at the unstable problem of high-speed running of the sewing machines shuttle shaft system, the rotor dynamics of the shuttle shaft system was calculated, the causes of instability were analyzed, the stability of the shuttle shaft system was theoretically analyzed, and the rotor dynamics characteristics of the shuttle shaft were simulated. Firstly, the rotor dynamic equation was deduced according to the instantaneous position and force of sewing machine rotor, and the dynamic analysis model of rotating hook shafting was established. Secondly, the rotor dynamics of rotating hook shafting under rigid support was simulated and analyzed in ANSYS Workbench, and the reasons for instability of rotating hook shafting in working speed were found out through modal analysis and unbalance response analysis. Finally, the influences of rotating hook axis diameter, bearing position, bearing stiffness, damping coefficient and axial preload on the stability of rotating hook shafting were studied. The structure and supporting stiffness range of rotary shuttle shafting meeting the service conditions were determined.The results show that the rotating hook shafting system has a critical speed within the working speed, which affects the stability of the rotating hook shafting system. The effect of increasing axle diameter on increasing critical speed is not obvious. When adding a bearing support point, the bearing support stiffness is more than 1000N/mm, the bearing sleeve support stiffness is more than 100N/mm, damping is less than 0.1, and the axial preload is less than 100 N, the rotating hook shafting system can run stably within the working speed.
Key words: sewing machine; rotor instability at high speed; critical speed; rotary shuttle shaft diameter; support position and stiffness; damping coefficient; axial preload
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