Novel expanding drilling tool

Abstract

A new reaming drilling tool is composed of a power head, a drill pipe, a centralizer and a reaming drilling tool. The power head provides the speed and torque, which is transmitted to the drill bit through the drill pipe, and the centralizer ensures that the drill pipe drills according to the preset trajectory; the reaming drilling tool is composed of three reaming drilling petals, and is responsible for the reaming and cutting work of the annular area; the connection method Lan connects the rotary drilling cylinder and the reaming drill flap into a whole; the rotary drilling cylinder is used for core drilling, and the soil chips formed by cutting enter the rotary drilling cylinder through extrusion to remove the soil outside the hole; Under the premise of verticality, the rapid rotation of the drill bit cuts the whole or part of the pile body, and takes out the cut pile body as a whole, and can rotate and squeeze the remaining cutting fragments in the drilling hole during the next drilling process. Into the drill barrel, so as to achieve the purpose of hole formation.

Description

Technical field [0001] The invention relates to a novel reaming drilling tool, which is especially used in roadbed construction. Background technique [0002] With the continuous development and improvement of drilling technology, new drilling methods emerge in an endless stream, and the equipment has also made significant progress. Many universities and enterprises at home and abroad have carried out a lot of research and development work in the design, manufacture and use of drill bits, and have developed from the original double-center reaming drill bit to the current commercial level reaming drill series. The double-center reaming bit includes two parts, the reamer and the pilot bit, each with its own rotation center, which can not only drill but also achieve centering. The upper part of the drilling tool is a reamer, and the radius of gyration is equal to the diameter of the required pile hole. At present, double-center drill bits have entered into serial production. ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of poor sealing performance and poor reliability of the existing new reaming drilling tools, the present invention provides a new reaming drilling tool, which has good mechanical properties and reduces The drilling friction is reduced, and the cutting ability is enhanced; it cooperates with the limit mechanism on the reaming drill flap to restrict the movement termination position of the reaming drill flap

Images