所述螺钉的螺杆直接旋入所述固定件的螺孔内，二者的螺纹紧密结合，从而可将两板体牢固连接于一起。
The screw of bolt revolted into threaded hole directly and the screw thread of them are combined tightly, so the two boards can be connected together firmly.
本实用新型提供了一种新颖的顶拔器，它有一根螺杆与调节支承体的中心内螺孔联接。
The utility model provides a novel supporting pulling device which is provided with a screw rod connected with the center of an adjusting supporting body through inner threaded holes.
用螺杆钻具组合实施煤矿工程孔定向钻进时，钻头侧向力是其主要力学特性。
The operation performance of PDC bits with screw drill tool appplied now in oilfield were analyzed comprehensively.
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