大学毕设论文__电动车载剪式液压升降台设计说明书.doc

电动车载剪式液压升降台的设计 摘要 本次毕业设计对象是液压升降平台，这套装置主要用于举升重物。它的举升高度为3米，举升重量为1吨，其动作主要是由两个双作用液压缸推动“X”型架，带动上板来实现的。该液压升降平台主要由两个部分组成：机械部分和液压部分，其中机械部分主要由上板架、下板架、内连杆和外连杆四部分组成。本设计设计、选择了机械部分材料与结构，并对其进行有限元受力分析与校核，以便检验是否满足强度、刚度的要求，分析及校核的结果证明机械结构的设计可以满足要求。在对液压控制系统的设计过程中，先进行了总体方案设计。在选择液压的各个控制回路的时候，在对各个回路进行了对比后调速回路我选择了进油口节流调速回路；卸荷回路我选择了带有三位四通电磁换向阀的卸荷回路；保压回路我选择的是用液控单向阀的保压回路。确定了各种基本回路后，又确定了液压系统的传动形式，由于开式系统所具有的系统简单和散热条件好等优点，所以把传动系统确定为开式系统。在拟定液压系统原理图后，对液压元件及辅件进行了设计、选择，并对其进行校核。 关键词: 液压；升降平台；上板架；下板架；内连杆；外连杆 ；有限元 Electric vehicle hydraulic lifts Scissor Design Abstract The graduation project is the subject of hydraulic lifting platform, this device is mainly used for lifting heavy objects. Its lifting height of 3 meters, lifting the weight of 1 ton, its action is mainly composed of two double-acting hydraulic cylinders push X shaped frame, drive on board to achieve. The hydraulic lifting platform consists of two main parts: the mechanical parts and hydraulic parts, wherein the mechanical part of the main frame by the upper plate and lower plate frame, inner links and outer links of four parts. This design design, selection of materials and construction machinery parts, and its finite element stress analysis and checking, strength, stiffness in order to verify that it meets the requirements, analysis and checking results demonstrate the mechanical structure is designed to meet the requirements. In the hydraulic control system design process, the first for the overall design. In selecting the respective hydraulic control circuit when, in each loop speed control loop after a comparison I chose the inlet throttle governing circuit; unloading circuit I chose three four-way solenoid valve with unloading load circuit; dwell circuit I chose with check valve dwell circuit. Identified all the basic circuit after he determined the form of a hydraulic drive system, because the system is simple and good thermal conditions, etc. open system has, so determined to open the transmission system. After