Variable-diameter hot melting drill bit for snow layer drilling

Abstract

The invention discloses a variable-diameter hot melting drill bit for snow layer drilling. The variable-diameter hot melting drill bit comprises a plurality of first heating blocks, a plurality of second heating blocks, a core body and a connecting core rod. The first heating blocks and the second heating blocks are arranged on the circumferential circle of the core body in a staggered mode; the connecting core rod is arranged in the middle of the core body in a penetrating mode, and the lower end of the connecting core rod is fixedly connected with a core body fixing block; first connecting rods are connected to the inner side walls of the first heating blocks in a pivoted mode, and the upper ends of the first connecting rods are connected to the upper portion of the core body through pinshafts in a pivoted mode; second connecting rods are connected to the inner side walls of the second heating blocks in a pivoted mode, and the upper ends of the second connecting rods are also connected to the upper portion of the core body through pin shafts in a pivoted mode; and the lower portions of the first heating blocks are connected to pressing rods of the core body fixing block throughpin shafts in a pivoted mode. The variable-diameter hot melting drill bit has the beneficial effects that the structure is simple, and working is reliable; and based on the modular design, damaged parts of the drill bit are conveniently replaced, the reliability of a drill tool is improved, and the manufacturing and maintenance costs are reduced.

Description

technical field [0001] The invention relates to a hot-melt drill bit, in particular to a variable-diameter hot-melt drill bit for snow layer drilling. Background technique [0002] At present, the Antarctic continent is covered by a thick ice sheet, which is formed by the accumulation and compaction of snow accumulation over the years. From the surface of the ice sheet to the depth of 60m to 120m below the surface, the snowfall does not completely solidify into ice, but forms a dense granular snow layer. At present, thermal fusion drilling technology has been widely used in Antarctic ice drilling. When the hot-melt drill bit drills into the dense ice layer, the meltwater produced cannot leak out, and then reaming will occur so that the formed drill hole is slightly larger than the diameter of the hot-melt drill bit. However, when drilling into the grain snow layer, all the melt water produced by melting leaks into the gaps in the surrounding snow layer, so the hole expansi...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a variable-diameter hot-melt drill bit for drilling in snow layers in order to solve the problem of drill stuck accidents when drilling in granular snow layers

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