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Reliability Analysis of the CAM on the Drive Gear Plate of D Type Knotter

Volume 15, Number 1, January 2019, pp. 23-34
DOI: 10.23940/ijpe.19.01.p3.2334

Haitang Cen, Peiwen Li, Ruitao Wei, and Xueke Si

School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot, 010000, China

(Submitted on September 7, 2018; Revised on October 8, 2018; Accepted on November 21, 2018)

Abstract:

Cams of drive gear plates are key components of D type knotters. Wear is the main failure mode of cams. Accordingly, this paper studies the relationship between cams’ wear and the reliability of a knot that is equipped in a D type knotter. Based on the theoretical and motional wear analysis of the cam mechanism assembled in a drive gear plate of a D type knotter, the mathematical relationship between cam wear and the displacement reliability of the cam follower is established. Moreover, the displacement reliability of the cam follower is calculated by joint simulation of the ADAMS virtual prototype and ANSYS. The following conclusions are reached after a considerable number of simulations: (1) The cam mechanism works at the stable wear stage at the time of design life. (2) The D type knotter will be unable to successfully tie knots anymore when the wear volume of the cam and contact surface of the follower reaches 2.3mm (the cam follower displacement reliability is 0.9463). (3) 99% displacement reliability of the cam follower, at a workload of 20000 bales, requires the mean wear of the cam contact surface to be less than 0.87mm. A further conclusion is that maintenance and replacement measures are suggested to be taken at a workload of 20000 bales, to ensure that the displacement reliability of cam follower is more than 99% and the D type knot is workable.

 

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