本科毕业设计(论文)
题目：采用调速阀的速度换接回路
实验装置设计

用调速阀的速度换接回路实验装置设计
摘  要
    速度换接回路的功用是使液压执行机构在一个工作循环中从一种运动速度换到另一种运行速度，因而这个转换不仅包括快速转慢速的换接，而且还包括两个慢速之间的换接。实现这些功能的回路应该具有较高的速度换接平稳性。
    本文阐述了采用调速阀的速度换接回路实验台的设计，主要对工作原理、结构组成、参数计算等发面做了详细的分析与研究，得出一套较为合适的方法来设计实验台。主要通过查阅相关资料，应用相关公式，从而对油箱进行设计，然后来选择液压站的动力装置，确定电机
与泵的安装方式，最后再根据原理图以及各项参数来进行管路与管接头的选择，从而完成整个设计。
论文首先综述了国内外液压技术的研究进展及研究现状、分析课题的研究背景、阐述课题研究的意义和内容。然后重点从原理设计、各回路的功能分析与选择入手，从而选择液压元件，计算其性能是否符合指标，最后校核温升。
关键词：液压基本回路；速度换接回路；实验装置
The Design of Switching Circuit Experiment Device
Adopting the Speed Regulator Valve
Abstract
    Speed exchange circuits are used to make the hydraulic actuator to change from one motion to another running speed in a work cycle, so the conversion includes not only the fast switching for slow, but also includes the exchange between the two slow. Loop should achieve these functions with high speed and stability
    This paper describes the design of circuit experiment platform for the speed regulator valve, mainly on the working principle, structure, parameter calculation etc to do a detailed analysis and research, to design the experiment which obtains a set of suitable method. Through access to relevant information, related formulas are used, thus the choice of tank, power plant and then to select the hydraulic station, the installation mode of motor and pump, finally to pipeline according to the schematic and the various parameters and selection of pipe joints, so as to complete the whole design.
The paper first summarizes the analysis of the status quo, and research progress of study on the hydraulic technology at home and abroad and the significance of research background, describes the research topics. Then focus from the principle of design, function analysis and selection of circuits, and choosing hydraulic components, its performance is in line with the index calculation, finally the check temperature rise.
Key Words: Hydraulic basic circuit；Speed changeover circuit；Experimental installation
主要符号表
qp        液压泵得最大流量
pp          液压泵最大工作压力
p1            执行元件最大工作压力 
Δpλ            沿程压力损失
KL            系统的泄漏系数
              ʋ              运动粘度
              CT            油箱散热系数
              Re          管道流动雷诺数

  3.2.1确定液压泵类型    7
  3.2.2原理图设计    汽车油箱容量7
  3.3.1液压缸主要尺寸的确定    11
  3.3.2选择液压泵规格    13
  3.3.3液压元件的选择    14
  3.3.4确定管路尺寸    15
6.3液压油的选择    26