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(一)密封滑动钻头设计原理四川地区地层老、岩性坚硬、研磨性大,钻头使用指标较低,目前钻头平均进尺为20米左右。从钻头损坏情况来看,不论牙轮钻头或球齿钻头,钻头寿命低的关键在于轴承的先期损坏。如川中地区8Z钻头常常仅用5～6小时,牙齿尚完好,但轴承已严重损坏,不能继续使用。川南地区球齿钻头寿命也在20小时以内。目前国内外普遍认为:用密封滑动轴承代替目前成批生产钻头的滚柱轴承是提高钻头寿命的主要途径,滚柱轴承作为主轴承一般要承受全部钻压的60～70％,而如此巨大的载荷又仅由每只牙爪下部受力面上的4～5颗滚柱承担,因此形成了极高的“接触应力”和
(A) seal sliding drill design principle Sichuan strata, lithology hard, abrasive, low use of the drill index, the current drill into the average footage of about 20 meters. From the bit damage situation, regardless of roller cone bit or bit, bit life is the key low bearing premature damage. If the Central Sichuan 8Z drill often only 5 to 6 hours, the teeth are still intact, but the bearings have been severely damaged, can not continue to use. Sichuan tooth bit life is less than 20 hours. At home and abroad is generally believed that: the use of sealed sliding bearings to replace the current batch of production roller bearings is to improve the life of the main drill, roller bearings as the main bearing generally bear all the weight-bearing 60 to 70%, and such a huge The load, in turn, is borne only by 4 to 5 rollers on the lower face of each claw, thus creating a very high “contact stress” and