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1959年,苏联谢尔金斯基工厂与齐良宾斯基矿业研究所合作设计并制造一批试验用洗井钻进的牙轮钻头。为了防止岩粉掉入轴承座上,在这些钻头的轴承空间形成空气的剩余压力。特别有效的是在考尔金露天矿场试验的ТИ(2B-8TK) 型钻头。这种钻头的每个轮缘
In 1959, the Soviet Shekkinski Works and the QIIBINSKI Mining Research Institute collaborated to design and manufacture a batch of roller cone bits for test well washing. In order to prevent the rock powder from falling into the bearing seat, the residual pressure of the air is formed in the bearing space of these drills. Particularly effective is the ТИ (2B-8TK) bit tested at the Caulk Opencast Mine. Each rim of this bit