A Long-stroke Pushing and Rotating Device for Seafloor Natural Gas Hydrate Pressure Core

Abstract

Because of the special occurrence condition of natural gas hydrate, it is important for scientists to study sample of natural gas hydrate under in-situ pressure. This paper mainly introduces a long-stroke pushing and rotating device for natural gas hydrate pressure core, which is an important component of the Analysis and Transfer System of Seafloor Natural Gas Hydrate Pressure Core. Then the working process of this device is described in detail. In addition, the static analysis and modal analysis on the integrity of the device with or without the auxiliary support slider structure are carried out by finite element analysis software ANSYS workbench, and the deflection of the two structures due to their own weight is obtained in the static state, and the first six order natural frequencies of the two structures are obtained. The research results show that this device with auxiliary supporting slider structure produces less deflection; moreover, the natural frequency of the device with auxiliary supporting slider structure is significantly higher than that device without auxiliary supporting slider structure. Therefore, it can be known that the device with the support slider structure has a large rigidity, whose stability is better. Finally, the stability is verified by experiments.