Stereoscopic curved-blade type drill assembly

Abstract

The invention discloses a stereoscopic curved-blade type drill assembly. The assembly comprises a drill subassembly, wherein the drill subassembly comprises a drill rod and a drill bit which is detachably connected to the bottom of the drill rod; the bottom of the drill bit is in a conical shape with a large upper part and a small lower part; at least two groups of spiral blades are arranged on the upper and lower parts of the excircle of the drill subassembly; the outer diameters of each group of spiral blades are increased sequentially from bottom to top; each group of spiral blades comprises a plurality of spiral blades which are connected to the excircle of the drill subassembly in central symmetry. According to the structure of the drill assembly, the drill bit is adopted for preliminary punching and direction guidance at first; secondly, the two-stage spiral blades are used for sequentially expanding drilling holes; the drilling difficulty of the upper spiral blades is reduced through initial drilling of the lower spiral blades, and the drilling capability of the drill assembly is improved; the drilling holes are formed into a plurality of stair platforms through drilling ofthe spiral blades of each stage. The stair platforms can carry falling mud, so that the bottoms of the formed drilling holes are prevented from being buried by the mud for the second time, and the drilling efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of plant planting and drilling, in particular to a three-dimensional curved surface blade type drill bit assembly. Background technique [0002] Transplanting is an important part of crop production. The time and quality of transplanting affect the survival of crops; the key technology in the process of crop transplanting when drilling holes; [0003] Taking tobacco transplanting technology as an example, film-covered pit-type seedling transplanting is the best transplanting method to solve the impact of flue-cured tobacco on the cold spring disaster, to achieve early transplanting, and to make tobacco seedlings obey the local climatic conditions. This technology is based on plastic film mulching cultivation, and integrates seedling transplanting and deep planting technology to solve the problem of weak tobacco seedlings in the best transplanting period in the flue-cured tobacco cultivation area, dry climate...

AI Technical Summary

Problems solved by technology

[0004] Punching holes is the key technology of flue-cured tobacco pit-type transplanting technology. The quality of the holes has an important impact on the planting efficiency, survival rate and later growth of seedlings. At present, the commonly used drill bit assembly is a continuous drill set on the drill pipe. The blade of the blade has a structure with a continuously changing diameter, which is easy for the soil to fall back, and the drilling efficiency is low, and the drilling ability of the drill bit assembly is relatively weak, so it cannot adapt to the working environment with relatively hard soil;

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