On-line automatic release device for trenchless drilling tool

Abstract

The invention relates to an on-line automatic release device for a trenchless drilling tool, which comprises a screw plug, a first connecting piece, a one-way valve, a sleeve, an end cover, a connecting plate, a second connecting piece, a cylindrical pin, an elastic element, a supporting seat and an unloading unit, wherein, the second connecting piece is sleeved on the outer circle of the first connecting piece, and the sleeve is sleeved on the outer circle of the second connecting piece; the first connecting piece, the second connecting piece and the sleeve are respectively provided with at least one coaxial mounting hole along the radial direction, and the two connecting piece mounting holes are connected by a cylindrical pin; the supporting seat is arranged on the sleeve, and the elastic element is arranged between the cylindrical pin and the supporting seat; the first connecting piece is provided with a liquid channel in the axial direction, the one-way valve is arranged on the first connecting piece, the working fluid with a certain pressure is injected into the liquid channel through the injection port of the one-way valve to act on the end face of the cylindrical pin, and the compression elastic element enables the cylindrical pin to be positioned between the first connecting piece and the second connecting piece; an unloading unit is arranged on the end face of the first connecting piece to control the opening and closing of the liquid channel; The on-line automatic release device can reduce the cost of the trenchless technology.

Description

technical field [0001] The invention belongs to the field of non-excavation technology, in particular to an online automatic release device for a non-excavation drilling tool. Background technique [0002] Trenchless technology refers to a new construction technology that detects, inspects, repairs, replaces and lays underground pipelines by means of guided and directional drilling without digging the surface or a small part of the ground. Horizontal directional drilling is one of the main means of trenchless technology. Trenchless horizontal directional drilling technology has fast construction speed, good economic benefits, and low environmental damage, and has been widely used in gas, electricity, natural gas, telecommunications, etc. The laying of pipelines. Drilling tools are the core components of trenchless horizontal directional drilling. With the development of related technologies and demands, the drilling distance of trenchless horizontal directional drilling a...

AI Technical Summary

Problems solved by technology

If locking occurs when the pipeline is pulled back halfway, and the drill pipe cannot advance and retreat, then the drill pipe worth about 1.75 to 2.5 million yuan and the pipeline of about 1.5 km worth of buried in the soil have to be discarded; Have to re-plan the route, re-construction, affect the construction period

[0004] At present, there is no online automatic release device for non-excavation drilling tools that can realize the automatic release and separation between the reaming bit and the drill pipe, and between the reaming bit and the transfer case during the construction process of the non-excavation horizontal directional drilling. The present invention is of great significance

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