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

doi:10.23940/ijpe.19.01.p3.2334

Abstract

Abstract:

Camsof drive gear platesare key components of D type knotters.Wearis the main failure mode of cams. Accordingly, this paper studies the relationship between cams’ wear andthe reliability of a knot that is equippedin a D type knotter. Based on the theoretical and motional wear analysis of the cam mechanism assembledin 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 followingconclusions are reached after a considerable number of simulations: (1)Thecam mechanism works at thestable 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,requiresthe mean wear of the cam contact surfaceto 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 ismore than 99% andthe D type knot isworkable.

Key words: D type knotter, drive gear plate, cam, wear and tear, displacement reliability

Haitang Cen, Peiwen Li, Ruitao Wei, and Xueke Si. Reliability Analysis of the CAM on the Drive Gear Plate of D Type Knotter [J]. Int J Performability Eng, 2019, 15(1): 23-34.

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References 17

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Simulation time	Wear displacement	Simulation time	Wear displacement
1	0.304	11	0.864
2	0.339	12	0.964
3	0.376	13	1.076
4	0.416	14	1.201
5	0.46	15	1.34
6	0.509	16	1.494
7	0.564	17	1.664
8	0.626	18	1.851
9	0.696	19	2.056
10	0.775	20	2.34

Simulation time	Wear speed	Simulation time	Wear speed
1	0.0408	11	0.1041
2	0.0455	12	0.1161
3	0.0505	13	0.1295
4	0.0559	14	0.1446
5	0.0618	15	0.1614
6	0.0684	16	0.1801
7	0.0758	17	0.2008
8	0.0841	18	0.2236
9	0.0935	19	0.2487
10	0.0408	20	0.2763

The pushtravel angle${{\phi }_{1}}$:	0~63.170	The radius of the cam follower	1.25cm
The return angle${{\phi }_{2}}$:	63.170~123.170	CAM rotation speedn:	90r/min
The distance of run in cam followerh:	2cm	CAM angular velocityω:	3πrad/s
The radius of camshafte:	2.8cm	Design service lifet:	40000 time
The Outer arc radius of camr_b:	4.2cm