Alarming drill rod for drilling of horizontal directional drilling machine

Abstract

The invention discloses an alarming drill rod for the drilling of a horizontal directional drilling machine. The alarming drill rod comprises a drill rod body, wherein a female joint is fixedly arranged at the rear end of the drill rod body; a washing fluid inlet cavity is formed in the female joint; a male joint is fixedly arranged at the front end of the drill rod body; a washing fluid outlet cavity is formed in the male joint; a hollow straight rod body is arranged in the drill rod body; an inner cavity of the hollow straight rod body is set to be a washing fluid passage I communicated with the washing fluid inlet cavity and the washing fluid outlet cavity; a chamber between the outer wall of the hollow straight rod body and the inner wall of the drill rod body is a washing fluid passage II; a washing fluid control switch is arranged in front of the hollow straight rod body. According to the alarming drill rod, a valve element is forced by the hollow straight rod body to move forwards along a guide groove of a valve seat under the resistance of a compression spring so as to automatically close a washing fluid flow passage, then the indication of a pressure meter of a surface mud pump sharply increases, and an alarming prompt is given, so that the drill rod is protected from being excessively bent and deformed, and the service life of the drill rod is prolonged.

Description

technical field [0001] The invention relates to the engineering field of trenchless underground pipeline laying, in particular to an alarm drill rod for horizontal directional drilling rig drilling. Background technique [0002] Horizontal directional drilling technology is widely used in trenchless pipelaying projects. Pipelaying projects are generally divided into three stages, namely pilot hole drilling, pullback reaming and pipe laying. The pilot hole refers to the use of a beveled, small-diameter drill bit to first form a small-diameter pilot hole according to a predetermined design trajectory, providing guidance for subsequent reaming and pipe laying. During the construction process, the drill pipe is used as a tool for underground operations. The working conditions are complex and changeable, with great differences. Practical experience tells us that the biggest danger of drill pipe fatigue is excessive direction change. The so-called excessive change of direction ref...

AI Technical Summary

Problems solved by technology

However, in the actual construction process, it is difficult to accurately measure the direction variability of the pilot bit during the steering process, so how to ensure that the drill pipe does not exceed the rated minimum bending radius of the drill pipe when changing direction has become a technology that needs to be solved question

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