Design And Experiment Of Bionic Suction Cup Based On The Adsorption Performance Of Beaufortia Kweichowensis

With the continuous advancement of artificial intelligence and industrialization in China,the performance requirements for the execution of mechanical parts such as vacuum suction cups are also increasing.Vacuum suction cups are widely used in many important fields because of their advantages such as stability,practicality and cleanliness.Nowadays,as people continue to develop and explore the ocean,adsorption equipment such as submersibles and underwater robots are gradually replacing humans to complete many underwater tasks.To meet the complex underwater conditions of efficient adsorption operations,the design of an efficient,stable and adaptable vacuum suction cup is of great significance.Beaufortia kweichowensis survives in mountain rapids and is a strong sorption organism.Relying on the high-performance biological suction cups evolved in its abdomen,it can steadily adsorb to rough rocks or mosses without being washed away by water.Therefore,inspired by Beaufortia kweichowensis with efficient adsorption performance of biological suction cups,using engineering bionics to design highperformance bionic vacuum suction cups that can adsorb on rough surfaces underwater is an effective way to solve the above problems.In this paper,the mechanism of the high adsorption and adaptation of Beaufortia kweichowensis was first investigated.Its macroscopic structure and movement state were observed by the high-speed camera;its abdominal suckers and lateral fins in the sealing area were observed separately using a scanning electron microscope.It was observed by scanning electron microscopy that the abdominal suction cups,which are attached to the substrate,have a honeycomb-like microstructure with a cell thicknessto-length ratio of about 0.2.This structure can store microbubbles and increase local adsorption and friction;on the marginal fins,microscopic setae structures were found.Through desorption experiments on a variety of substrates,it was concluded that the adsorption performance of the rock crawler loach was dominated by the vacuum negative pressure,and the adsorption force other than the vacuum negative pressure only accounted for 6% of the total adsorption force;through adsorption force experiments on rough surfaces,it was found that the adsorption force did not vary linearly with the roughness,but there were two adsorption force intervals.Through analysis,this is related to its side fin multi-stage sealing mechanism.The fins and fin bristles form a multi-stage structure that can fill the rough surface pits,which can not only help the suction cups form a complete seal,but also form a mechanical hook-up to increase its contact friction.By analyzing the deformation of the standard suction cups in terms of disassembly,the main reason for their disassembly is the buckling of the edge sealing area.Both the structural strength and frictional stress of the sucker can affect the circumferential stress of the edge.In this paper,the abdominal suction cup of Beaufortia kweichowensis is used as a bionic prototype,and the honeycomb structure on its abdominal suction cup is designed and fabricated as a macroscopic bionic.In the bionic design,the thicknessto-length ratio of the surface honeycomb is chosen to be close to that of the biological sucker at 0.2.The honeycomb structure of the bionic sucker is designed to be continuous in the circumferential direction to form a multi-stage seal.The role of the bionic weave in the desorption process was analyzed using equivalent simulation calculations to derive the effect of this bionic surface weave on the suction cup adsorption force under the structural strength and radial friction factors.From the orthogonal experimental data,it is concluded that the bionic 6 suction cup has the largest adsorption force and has high adaptability and stability.Compared with the standard suction cups,the average adsorption force of bionic 6 is improved by 4.1% on a variety of rough surfaces and 5.2% on the roughest P60 substrate;the failure time is improved by more than 50% under different load conditions.Through experiments and analysis,the mechanism of the bionic weave is finally concluded as follows: the bionic weave improves the structural strength of the suction cup,reduces the contact area,makes the multi-stage embedded seal formed by stress concentration;generates mechanical interlocking with the substrate,increases the radial friction stress,delays the shrinkage displacement of the lip during suction cup disassembly,and reduces the lip circumferential stress;provides greater lip contact stress for the bionic suction cup,improves the lip sealing performance,and increase the critical load of the lip edge for flexural collapse;weaving to form secondary suction cups to enhance the adsorption performance.