Abstract

The hydraulic system to transfer power, ensure adequate power is its basic requirement. In addition, consider the system stability, reliability, maintainability, safety and efficiency. The stabilizing means when the system works steady motion and system performance stability (such as environmental temperature on the influence of oil etc). Reliability refers to the system is not due to accident reason to work ( such as tubing rupture without electricity, etc. ). Maintainability is referred to the system as simple as possible, element is chosen as far as possible standard parts, structure as much as possible so that the maintenance is convenient. Security is not due to the fault of the hydraulic system causes the antenna frame collapse or other accidents (such as the drop out of control, antenna due to gravity acceleration whereabouts ) . Efficiency refers to the hydraulic system of the various energy loss as small as possible. The above requirements, in addition to meet the power requirements, the most important thing is to ensure the safety and reliability of the system.
Keywords: hydraulic system, lifting mechanism

目  录

摘  要 I
Abstract II
目  录 III
第1章 绪论 1
1.1课题研究的目的 1
1.2 本课题的研究内容 1
第2章 课题总体设计 2
2.1总体布置原则 2
2.2 车厢的设计 2
2.2.1车厢的结构形式 2
2.2.2 车厢的设计规范及尺寸确定 3
2.3 举升机构的设计 4
2.3.1 举升机构形式的选择 4
2.3.2 直接推动式举升机构 4
2.3.3 连杆组合式举升机构 5
2.4 后车厢开合的两种机构形式 7
2.5 后车厢开合机构中三种液压缸布置方式的分析比较 8
2.5.1问题的提出 8
2.5.2三种方案的分析和比较 8
第3章 主要部分分析计算 11
3.1 实例分析 11
3.1.1后车厢开合的结构简化 11
3.1.2机构受力分析 12
3.2 剪叉臂长度及液压缸安装位置的确定 15
3.3 强度校核 17
3.3.1 剪叉臂的强度校核 17
3.3.2  液压缸底架固定横梁的强度校核 20
3.4 轴的强度校核 22
3.4.1 内剪叉臂固定端销轴的强度校核 23
3.4.2 液压缸缸体尾部销轴的强度校核 23
3.4.3 液压缸活塞杆头部支撑轴的强度校核 23
第4章 液压系统设计计算 25
4.1 主液压缸的设计 25
4.2 副液压缸的设计 28
4.3 活塞的设计 29
4.4 导向套的设计与计算 30
4.5 端盖和缸底的设计与计算 31
4.6 缸体长度的确定 32
4.7 缓冲装置的设计 32
4.8 排气装置 33
4.9 密封件的选用 34
4.10 防尘圈 35
4.11 液压缸的安装连接结构 36
第5章 液压泵的参数计算 37
第6章 电动机的选择 38
第7章 液压元件的选择 39
7.1 液压阀及过滤器的选择 39
7.2 油管的选择 40
7.3 油箱容积的确定 40
第8章 验算液压系统性能 40
8.1 压力损失的验算及泵压力的调整 40
8.2 液压系统的发热和温升验算 43
总结 44
参考文献 45
致谢 46

机械毕业设计|论文