Mechanism Design of a Multi-rod and Wireline-coring Drill Tool for Seafloor Sediment-sampling Robots

Seafloor sediments offer a wealth of knowledge on the historical evolution and minerals of the ocean. The exploration and exploitation of deep-sea resources are crucial for the sustainable development of human society. Sampling robots have taken the role of humans to sample seafloor sediment for scientific or engineering research in the deep sea. The drill tool is a core mechanism that affects the coring rate, coring time, and coring size of seafloor sediment-sampling robots for scientific or engineering investigation. The operational complexity of conventional coring and wireline coring is discussed in this paper. The considerations of the multi-rod and wireline-coring drill tool for deep seafloor sediment sampling are analyzed. A multi-rod and wireline-coring drill tool is proposed, including a core barrel assembly and an overshot assembly. The basic structure and working principle of the drill tool are introduced. The overall assembly and prototype of the proposed drill tool are described. This paper can provide some theoretical and technical references for the innovative design of drill tools for seafloor sediment sampling.