为解决现有飞机装配升降液压千斤顶在工作中存在容易漏油、自锁性能差、结构复杂、升降速度慢，锁紧机构在快进过程中需要人工随时调整，移动到飞机支撑窝点比较困难，本身不具有实时测量载荷功能等不足，本论文研制了一种新型电动机械式千斤顶。作者参与了千斤顶的机械结构设计、样机制作和测试检验的全过程，主要完成了以下几项工作： （1）完成了机械式千斤顶的方案设计，并通过Solidworks软件完成该千斤顶整机结构立体三维模型设计，以及移动机构，快速驱动机构、重载驱动机构和测载机构四部分的零件设计，机械强度校核和加工工艺设计。针对转场该千斤顶设计的移动机构既能实现X向的长距离移动，又增加了Y方向的微调机构。根据现场工作行程与空行程的分布特点，空行程使用快速驱动机构快速升降，工作行程使用重载驱动机构大扭矩低速平稳顶升，减少了升降时间。在升降过程中任何位置都能机械自锁。而且锁紧套的操作始终在支撑平台高度，千斤顶上升过程中不需要人工不停的旋转锁紧套。在重载支撑平台圆周方向嵌入了测力传感器，以便于在飞机顶升过程中对千斤顶系统进行同步调整和自动实现装配过程的配重检测。 （2）利用ABAQUS有限元分析工具对设计后的主要零部件进行了应力和应变分析并进行了结构优化，经过分析计算，合理优化整体结构在保证强度的前提下减轻了结构重量，通过在支撑柱上焊接槽钢结构和中间多层连接平台，使得整个支撑架的结构强度和稳定性提高，重量减轻。 （3）设计的CAD图纸经过加工装配成自重为1.2T的千斤顶物理样机，在陕飞的综合实验中心重载实验台上进行了空载实验、额定载荷试验和强度载荷试验，实验结果表明该千斤的升降机构、测载功能和结构强度完全符合要求，但千斤顶的起重性能未能达到设计要求，主要原因是螺旋传动机械效率设计时考虑不周，经过理论计算把重载驱动的梯形螺纹改进成锯齿型螺纹并增加扭矩的输入完全可以满足要求，已经完成三维模型的建立和图纸设计。

The existing aircraft assembly lifting hydraulic jack is easy to leak, and has poor self-locking performance, complex structure, slow lifting speed and it’s locking mechanism in the process of fast forward needs manually adjust, it is difficult to aircraft jack-up, it has not real-time load measuring function.In order to solve these problem, this paper developed a new type of mechanical jack.The author participated in the mechanical structure design, prototype production and the whole process of testing of this jake, this paper mainly finished the following work: (1)Completed the mechanical design,the stereoscopic 3d model design, the mobile mechanism, fast driving mechanism, overloading driving mechanism and load test by Solid-works, and intensity checking and processing technology design. The mobile mechanism can realize long distance movement to X , and fine-tune to Y. According to the distribution characteristics of working stroke and vacant route, vacant route uses fast driving mechanism to realize quick lifting ; working stroke uses overloading driving mechanism to realize low speed and stable lifting, which can greatly reduce the total lifting time. Most importantly, the lifting process can be locked by itself in any position. Locking set operation is always in the height of supporting platform, and the lifting process does not need manual rotation the lock set. Force transducer is embedded in to circumferential direction of the heavy support platform, which can accurately measure the load so that the jack system can realize synchronous adjustment in the process and automatic detecting of the assembly process. (2) Using the ABAQUS to analyze the stress and strain of main components after designing and structure optimization. Through analysis and calculation, on the premise of guaranteed strength, the reasonable optimization of overall structure reduced the weight of this jack. Welding channel on the shoring and middle layers connection platform increase the whole strength and stability of the support frame. (3) Processing and assembling into a 1.2T jack prototype by the CAD drawings. The rated load test and strength test were held in Shaanxi Aircraft Industry Group load test center. The results of experiments show that the lifting mechanism, measuring function and strength completely meet the requirements, but the lifting performance fails to meet the design requirements, it mainly because the efficiency of spiral mechanical transmission is inconsiderate. After theoretical calculating, changing trapezoidal screw into zigzag screw can completely meet the requirements, drawings have been completed.