Core bits for soft-hard drilling objects

Abstract

The invention provides a coring bit suitable for soft-hard drilling objects. The coring bit comprises a bit base body and a conical head arranged below the bit base body, wherein the bit base body is in a hollow cylinder shape; a drill stem connecting part is arranged at the upper end of the bit; the inner diameter of an opening of the conical head is smaller than the inner diameter of the hollow cylinder of the bit base body; an external spiral is arranged on the outer surface of the bit base body; grooves are formed in the inclined surface and the bottom surface of the conical head; cutting tools with corresponding shapes are arranged in the grooves and are riveted in the grooves through rivets; a limiting piece for limiting initial positions of the cutting tools is formed between holes in the rivets and the cutting tools; a high-temperature-resistant elastic cushion block is arranged between the cutting tools arranged between the limiting piece and the bottom of the groove and the groove. The coring bit suitable for soft-hard drilling objects is high in adaptability, and hard and soft rocks can be simultaneously crushed without replacing the bit; smooth powder discharge is realized, the cutting heat and friction heat are dissipated out of the hole bottom through drilling cuttings, and the heat dissipation is reduced; in order to improve the cutting efficiency, the cutting blade can have multiple cutting angles by adjusting the size of a rubber cushion block.

Description

technical field [0001] The invention belongs to the field of space drilling, and relates to a drill bit structure for drilling cores on the surface of the moon by using a coring bit to obtain the original lunar soil under the space environment. Especially in complex lunar soil, including soft and hard core drilling objects. Background technique [0002] In the existing technology, the return of unmanned lunar sampling in the lunar exploration project is a key step in understanding the moon. Through the analysis of the recovered lunar soil, it can be found in the lunar surface environment, geological structure, lunar surface mineral composition, lunar base site selection, etc. Breakthroughs have been made in many scientific research directions. The core bit is one of the important tools needed for lunar surface drilling, and it plays a key role in the smooth realization of lunar soil sampling. [0003] Except for a few very steep mountains, impact craters, and cliffs of vol...

AI Technical Summary

Problems solved by technology

[0005] At present, the understanding of lunar soil is limited, and the drillability of lunar soil is not yet clear, which also brings difficulties to the design of core bits.

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