Tests for a coal planer knives&rsquo; cutting loads and its head&rsquo;s vibration characteristics

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (19) : 149-155.

Tests for a coal planer knives’ cutting loads and its head’s vibration characteristics

CHEN Hongyue1,2,3, WEI Yufeng1, MAO Jun1,2, LIU Hui1

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Abstract

To reveal a coal planer’s knives cutting load and its head vibration laws and search factors affecting their variations, dynamic characteristics of a 1:1 scale coal planer model were tested on a test platform simulating actual operating conditions to obtain load distribution laws of the planer head’s 3 knives including upper wide knife, central short one, and lower long one and the planer head vibration characteristics. Test showed that the upper wide knife has the largest cutting load, the lower long one has the second, and the central short one has the smallest; recurrence rates of amplitudes of planing force, lateral one and compressive one of 3 knives present Rayleigh distribution; the planer head’s vibration acceleration in x direction fluctuates within a range of ±200 m/s2, that in z direction fluctuates within a range of ±100 m/s2, and its rotating angular acceleration in xz plane fluctuates within a range of ±100 rad/s2; the variation trend of vibration curves has a certain level of similarity to that of knives’ load curves; peak frequencies of power spectral curves of knives’ loads are integer multiples of vibration frequencies along line of the planer head; peak frequencies of the power spectral curve of the planer head vibration include vibration frequencies along line of the planer head and peak frequencies of knives’ loads; straightness along the middle groove of a scraper conveyor is the main factor affecting planer knives’ load fluctuation and planer head vibration.

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coal planer / dynamic characteristics / vibration and shock

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CHEN Hongyue1,2,3, WEI Yufeng1, MAO Jun1,2, LIU Hui1. Tests for a coal planer knives’ cutting loads and its head’s vibration characteristics[J]. Journal of Vibration and Shock, 2020, 39(19): 149-155

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