A liquid metal-based hot-melt drill bit for vertical drilling of polar grain snow layers

Abstract

The invention provides a liquid metal-based polar grain snow layer vertical drilling hot-melt drill bit, which belongs to the field of drilling equipment and includes a power supply cable, an upper cover, a heat insulating ring, a melting ice sphere, a short heating rod, a long heating rod, and a heating copper The core and the liquid metal cavity, the heating copper core and the melting ice sphere are concentrically arranged, and a high temperature resistant sealing ring is installed between them; the heating copper core, the melting ice sphere and the high temperature resistant sealing ring together form a liquid metal cavity, and the liquid metal cavity The liquid metal is filled with liquid metal, and the filling height of the liquid metal is less than the radius of the melting ice sphere; the liquid metal with high thermal conductivity is used as the heat transfer medium, and the fluidity and gravity of the liquid metal are used to realize the control of the heat transfer direction of the drill bit, so that the drill bit can be Automatically keep downward vertical drilling during drilling, which will greatly reduce the possibility of hole inclination in the polar snow layer hot melt drilling, improve the hit rate of the drilling target area, and reduce the risk of sticking of the drill bit during the drilling process. probability, has a wide range of application prospects.

Description

technical field [0001] The invention relates to the field of drilling tools, in particular to a liquid metal-based hot-melt drill bit for vertical drilling of polar grain snow layers. Background technique [0002] Ice layer thermal melting drilling is one of the drilling methods for rapid hole formation in polar snow and ice layers. It has the advantages of light equipment, easy portability and low power consumption. It has been widely used in polar and alpine glaciers in the past few decades. . Conventional electric heating hot-melt drills usually use heating rods or heating pipes to directly heat solid metal bodies or annular metal rings to achieve full-hole drilling or core drilling. However, in the actual use process, due to the poor uniformity of the physical properties of the ice layer and the uneven heating of the drill head, the ice melting speed of each part of the hot-melt drill bit is different, which often leads to the deflection of the hot-melt drilling hole, a...

AI Technical Summary

Problems solved by technology

However, in the actual use process, due to the poor uniformity of the physical properties of the ice layer and the uneven heating of the drill head, there are differences in the melting speed of the various parts of the thermal melting drill bit, which often leads to deflection of the thermal melting drill hole, and the serious hole deviation can reach dozens. depth, resulting in the inability to accurately reach the target depth and formation

In order to realize the vertical drilling of ice layer thermal drilling, decompression drilling is usually adopted in the world, and the thermal melting drilling tool is suspended by cables to reduce the contact pressure between the drill bit and the ice layer, so that the drilling tool can return as much as possible under the action of gravity Vertical drilling axis, but this method is limited by the length of the drilling tool. For longer drilling tools, once the hole deviation occurs, it is almost impossible to correct it in a short distance

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