保压取心技术能够将获取的深部煤层样品在孔底直接封存，以最大限度消除取心过程中瓦斯逸散；基于获取的保压岩心开展带压转移及测试是实现瓦斯含量精准测定的技术前提，而如何实现保压取心与带压转移测试的精准对接，已成为亟需解决的关键技术难点。围绕保压取心系统与测试系统对接转移的核心部件自锁转移机构开展研究，基于理论计算与室内试验，对自锁转移机构的装配关系、运动特性与承载能力等进行分析。首先，创新设计了可集成于保压取心系统内部的自锁转移机构，根据取心作业实际工况揭示了锁紧轴顺利通过与安全承载的临界条件；通过理论计算，获取了锁紧环与锁紧轴的最佳装配过盈量为0.1 mm，此时无论通过性还是抗拉承载特性均能保持良好的力学性能。其次，开展了室内锁紧轴通过性及拉伸承载测试，验证了5 kN拉伸载荷作用下锁紧机构的工作安全性。最后，完成了自锁转移机构的样机试制与装配，并进行了入井功能及带压转移动作测试，验证了自锁转移机构动作可靠性。研究成果为获取原位保压岩心并开展带压转移测试等提供了技术基础与装备支撑。

Pressure-preserved coring technology can directly store the collected deep coal samples at the bottom of the hole, so as to minimize the gas loss during the coring process. Besides, pressure transfer and testing of the pressure-preserved rock core is a technical prerequisite for the accurate determination of gas content. Then, how to achieve the precise docking from pressure-preserved coring to pressure transfer and testing has become a key technical difficulty that needs to be overcome urgently. Therefore, the research was carried out around the self-locking transfer mechanism, which is the core component of the docking transfer between the pressure-preserved coring system and the testing system. Specifically, the assembly relationship, motion characteristics and bearing capacity of the self-locking transfer mechanism were analyzed based on the theoretical calculation and laboratory test. Firstly, a self-locking transfer mechanism integrated into the pressure-preserved coring system was innovatively designed in the study. Meanwhile, the critical conditions for the smooth passage and safe bearing of the locking shaft were revealed based on the actual working conditions of the coring operation. The optimal assembly interference between the locking ring and the locking shaft was theoretically calculated to be 0.1 mm, at which the good mechanical properties could be maintained in terms of the passability and tensile bearing characteristics. In addition, the laboratory passability and tensile bearing tests were carried out to verify the working security of the locking mechanism under 5 kN tensile load. Finally, the prototype of the self-locking transfer mechanism was trial manufactured and assembled, with the downhole function, as well as the pressure transfer and testing completed, which verified the operation reliability of the self-locking transfer mechanism. The research results provide technical basis and equipment support for the in-situ pressure-preserved coring, pressure transfer and testing.