Diameter-adjustable type drill and segmented chambering method

Abstract

The invention provides a diameter-adjustable type drill and a segmented chambering method, relates to the technical field of mining drills and aims at solving the technical problem that drills need tobe replaced when drilling bore diameters are changed. The drill structurally comprises a drilling mechanism, a bore diameter adjusting mechanism and a drill stem mechanism, wherein the drilling mechanism comprises an outer drill tube, drilling blades, chambering blades and a spring, the drilling blades are arranged at the end part of the outer drill tube, and the chambering blades are hinged to alateral wall of the outer drill tube; the bore diameter adjusting mechanism comprises an inner drill spindle and a one-way bearing, the one-way bearing is fixed to an inner wall of the outer drill tube, a limiting pin is arranged on an inner side of the one-way bearing, and the limiting pin slides in a vertical guiding groove which is formed in the inner drill spindle; the drill stem mechanism comprises a rod body, end heads and a screw cap, butt joint grooves are formed in the end heads at the two ends of the rod body, and the screw cap is arranged at one end of the rod body. When the drillis utilized to drill holes, the bore diameter sizes can be adjusted by adjusting the drilling direction of a drill stem, and the purpose of segmented chambering in the same drill hole is achieved. Thediameter-adjustable type drill disclosed by the invention has the advantages of high drilling efficiency, convenience in construction and the like.

Description

technical field [0001] The invention relates to the technical field of mining drill bits, in particular to a drill bit with adjustable diameter and a drilling construction method for segmented reaming using the drill bit. Background technique [0002] In the deep mining of coal mines, the prevention and control of rock burst is the focus of ensuring safe mining. Among them, large-diameter borehole pressure relief is widely used as an important technical means in rock burst prevention and control. In the large-diameter drilling pressure relief technology, the larger the diameter of the pressure relief hole, the more sufficient the pressure relief effect, but too large a hole will cause excessive fragmentation of the coal body, resulting in failure of the roadway support system and causing greater accidents. Reaming and pressure relief technology is to drill small-diameter boreholes near the coal wall, and change them to large-diameter boreholes deep in the stress-concentrate...

AI Technical Summary

Problems solved by technology

However, the reaming part of the mechanical reaming bit has more connecting components, complex structure, and low durability. For example, a retractable two-wing reaming bit disclosed in Chinese patent 201520668720.5

Existing drilling equipment generally can only meet the need of reaming the diameter once, and the drill bit needs to be replaced when the drilling diameter is changed for the third time, which greatly reduces the work efficiency and increases the labor cost

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