北京型钻机转盘的大盖与罩盖之间由于密封不严,提钻时,钻杆从井内带上来的泥浆漫在转黜大盖上,并常从两盖的间隙进入转盘,从而加剧了轴承和齿轮的磨损.尤其是心管上头的大轴承,由于润滑条件差,泥沙进入更易使其磨损.一副大轴承一般只能用一个月左右,往往影响生产. Beijing-type rig turntable between the cover and the lid due to the seal between the rigging, jacking, drill pipe mud brought in from the well over the transfer cover, and often from the gap between the two covers into the turntable, which exacerbated Bearings and gear wear.Especially the big heart on the top of the bearing, due to poor lubrication conditions, sediment into the more easy to wear.A large bearing generally only about a month, often affect the production.