SQ35切丝机刀辊进刀压链轮故障分析与改进

Failure Analysis and Improvement of Tension Roller for Knife Feed Mechanism of Knife Drum in SQ35 Tobacco Cutter

SQ35切丝机在生产过程中经常出现刀辊不进刀故障,原因在于压链轮与轴的间隙过大,压链轮中的滑动轴承内圈孔径磨损严重,导致1、2级涡轮蜗杆出现胶合、滚压变形、折断等现象。为此,对SQ35切丝机的进刀压链轮进行了改进,将滑动轴承改为滚针轴承,采用骨架油封圈结构保证润滑油不受污染,从而降低了摩擦阻力以及链条的张力,提高了轴承的承载能力,减少了进刀系统故障次数,保证了设备的正常运转以及切丝质量的稳定。实际应用表明,单台切丝机的年换件故障维修次数由改进前的43次减少为12次,由于设备故障造成的不合格烟丝量由2365kg减少为660kg。

Failed in knife feeding in SQ35 tobacco cutter is secondary worm gear pair resulted from over-wide clearance a frequent failure caused by damaged primary and between tension roller and its shaft or serious wear of tension roller＇ s sliding bearing. The tension roller is modified by replacing sliding bearing with needle bearing and adopting pedestal oil ring to prevent lubricating oil from being contaminated, decrease friction and chain tension, as a result to reduce the failures of knife feeding mechanism, and ensure normal machine running and tobacco cutting. The practical application indicated that the frequency of parts replacing reduced from 43 to 12 times/year per machine, and the amount of cut tobacco not up to the standard caused by machine failures decreased from 2365 to 660 kg.