Replaceable cone bit system

Abstract

The invention relates to a replaceable cone bit system and belongs to the field of rotary drill rigs. The a replaceable cone bit system mainly comprises replaceable cone bits and cone drill barrels and is mainly characterized in that each replaceable cone bit is composed of a U-shaped cone seat, a connecting seat, a cone head, an alloy member, a steel ball, an O-shaped seal ring, a screw plug, a check rod, and an elastic cylindrical pin, the replaceable cone bits are welded to walls of rotary drill rig barrels alternately through the U-shaped cone seats, and alternate protection is provided between every two adjacent cone drill barrels; since the replaceable cone bit structure is connected by using U-shaped structures and fixed through the elastic cylindrical pins and is fully capable of bearing radial force and axial lateral force produced when cones operate, the U-shaped cone seats themselves may also be replaced conveniently and quickly, time and drilling cost are greatly saved, and drilling efficiency is improved.

Description

technical field [0001] The invention relates to a roller cone bit for rotary drilling rigs in the foundation engineering pile foundation excavation industry, and adopts a brand-new replaceable structure and welding method, in particular to a replaceable roller cone bit system. Background technique [0002] The roller cone bit was originally the most widely used bit in the oil drilling industry, suitable for various formations from soft to hard. In recent years, the foundation engineering pile foundation excavation industry at home and abroad has successively adopted roller cone bits to excavate rock formations from soft to hard for the excavation of foundation pile foundations. The roller cone bit is directly welded on the wall of the roller cone drill barrel. When working, the roller cone bit first contacts the rock excavation surface, and is pressed against the rock surface under the action of thrust. With the rotation of the roller cone drill barrel, the roller cone bit ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a roller cone bit system with stable performance, reasonable structure, and replaceability, so as to solve the problems of uneven load bearing pressure, troublesome replacement, and low excavation efficiency during underground rotary excavation. The defect that the roller cone drill barrel is scrapped, and at the same time solve the excessive wear of the cone head caused by the excessive radial spacing during the process of directly welding the roller cone bit to the wall of the drill barrel

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