伸缩式井下牵引器双向锁止机构设计

Two-way Locking Mechanism Design for Telescopic Downhole Tractors

刘清友 郑威 杨亚强 张书扬 朱海燕

LIUQingyou ZHENGWei YANGYaqiang ZHANGShuyang ZHUHaiyan

西南石油大学机电工程学院, 四川 成都 610500 西华大学流体及动力机械教育部重点实验室, 四川 成都 610039 中核建中核燃料元件有限公司, 四川 宜宾 644000 西南石油大学石油与天然气工程学院, 四川 成都 610500

School of Mechatronics Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China Key Laboratory of Fluid and Power Machinery of Ministry of Education, Xihua University, Chengdu, Sichuan 610039, China CNNC Jianzhong Nuclear fuel Co. Ltd., Yibin, Sichuan 644000, China School of Oil and Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China

为提升伸缩式井下牵引器的牵引能力，设计了一种基于斜面自锁原理的伸缩式井下牵引器双向锁止机构。该机构使得牵引器能够在前、后方向与井壁自锁，克服了牵引力受限于恒定静摩擦力的问题；使得牵引器能够实现双向牵引，进而提高牵引器的牵引能力。双向锁止分为牵引锁止和复位锁止，通过对两种锁止状态下的双向锁止机构进行静力学分析，导出双向锁止机构满足双向锁止条件时的数学关系式，并对双向锁止机构进行了参数设计，使得牵引锁止为自锁锁止，复位锁止为非自锁锁止。建立牵引器前工作短节动力学仿真计算模型，完成了双向锁止过程仿真计算，验证了双向锁止机构参数设计的正确性和双向锁止的可行性。

Design of a two-way locking mechanism for telescopic downhole tractors, based on the principles of self-locking ramps, is reported to improve the traction capacity of telescopic downhole tractors. The proposed mechanism allows the tractor to lock itself to shaft linings in its fore and aft structure, thereby overcoming restrictions in traction force imposed by static frictional forces. This allows the tractor to be towed in both directions while also improving its traction capacity. The twoway lock comprises two locking states:the traction lock and reset lock. Through static-force analyses of both locking states, mathematical relations describing the two-way locking mechanism, when it meets the required locking conditions, were derived. Parametric design of the two-way locking mechanism was performed to ensure that the traction locking state is a self-locking state while the reset locking state is not. Subsequently, a computational model was established to simulate the dynamics of a tractor's frontal working section, thereby completing simulation of two-way locking processes. Results of these simulations have been used to validate the accuracy of the parametric design of the two-way locking mechanism, and the viability of the proposed mechanism has been proven.

10.11885/j.issn.1674-5086.2016.12.24.01