Study Of Back-up Tong Of Top Drive Drilling System

Top drive drilling device has become one of the important equipments of drillingtechnology in the21st century. Top drive drilling device is more reliable, efficient andsafe than traditional drilling device. In recent years, the top drive drilling devicedevelops mainly towards miniaturization and disassembility at home and abroad. Atpresent, domestic top drive drilling equipment has a huge disparity from the foreignone whether in structure or reliability.As an important part of the top drive drilling device, back-up tong is mainly usedto buckle and shackle the drill pipe. In addition, it can be also used to replace jointsand IBOP. The evil environment of the working place and the high working intensityof the top drive drilling device, as well as the high failure rate of the back-up tong,make it urgent to improve the reliability of the back-up tong. In this paper, based onthe original structure of the back-up tong, ADAMS and ANSYS are used to completekinematic and static analysis of the back-up tong. And hydraulic system dynamiccharacteristics are obtained by simulation analysis with AMESim, in order to improvethe work efficiency and work reliability.Firstly, this paper briefly introduces the basic structure of the top drive drillingdevice, and analyses the function and basic structure of the back-up tong in detail. Wefurtherly explain the working principle of the back-up tong and some problems inexisting research, and determine the basic structure size through design calculations.Besides, the back-up tong clamping model is established based on CATIA.Secondly, the technology of virtual prototype and its application in oil drillingmachine are introduced simply. Based on the three-dimensional model of the back-uptong, ADAMS is applied to the kinematics and dynamics simulation analysis of theback-up tong. The speed and acceleration motion curve of moving components of theback-up tong in clamping and loosening process is obtained, and characteristics ofmotion of the back-up tong is explored preliminarily, providing the theory basis for the design of the hydraulic system.Again, statics analysis of key parts of the back-up tong is carried out usingANSYS Workbench in Finite Element Analysis Software. The stress distribution ofthe parts under the stress state is gained, and provides the reference for improvementof the key parts.Finally, we analyse hydraulic principles of the back-up tong briefly and establishhydraulic principle diagram. The simulation analysis of clamping drill pipe process isperformed based on AMESim, and the hydraulic system dynamic characteristic curveis obtained, verifying the feasibility and reliability of the back-up tong hydraulicsystem.The development of top drive drilling device is very short at home, and theresearch results is not mature yet in many ways. This research can provide theoreticalreference for top drive system or other petroleum machinery products.