露天选采机液压系统设计

目录
摘  要 I
Abstract II
 
第1章 绪论 1
 1.1 露天煤矿及露天煤矿采煤工艺的发展 1
 1.2 矿山机械中的液压传动 1
 1.3 LMXC-I型露天选采机的概述 3
第2章 液压系统设计计算 5
 2.1 技术要求 5
 2.1.1 LMXC-I型滚筒式露天选采机液压传动系统综述 5
 2.1.2 液压传动系统的设计参数 5
 2.2 系统功能设计 5
 2.2.1 确定主要参数 5
 2.2.2 拟订液压系统原理图 14
 2.3 组成元件设计 16
 2.3.1 主液压泵及其驱动电动机的确定 16
 2.3.2 整个液压系统中各液压缸动作情况 20
 2.3.3 液压控制阀的选择 21
 2.3.4 管路的选择、布置与连接 22
 2.3.5 油箱及其组件的设计 24
 2.3.6 液压泵组的结构设计 31
 2.4 验算液压系统技术性能 32
 2.4.1 系统效率的估算 32
 2.4.2 发热温升估算及热交换器的选择 33
第3章 液压系统的使用和维护 36
 3.1 注意事项 36
 3.2 液压系统常见故障及排除方法 36
结  论 39
致  谢 40
参考文献 41
附录1 42
附录2 46

摘  要
 
 由于我国露天煤矿存在大量的复合煤层，而目前对复合煤层的开采还缺少必要的手段和设备，使得露天煤矿的回采率难于提高。因此迫切需要研究开发针对复合煤层开采的设备，需要研制出可精确地、选择性地开采独立矿层，适合含有矸石夹层的复合煤层的开采新型露天煤矿开采设备。LMXC-I型露天选采机是在滚筒式露天采煤机的基础上研究开发出来的新机型，它可以有效地开采复合煤层，提高露天煤矿的回采率。LMXC-I型露天选采机的截割部和机身升降、行走履带的驱动和转载机的回转及升降均采用液压传动技术，该液压系统采用开式系统。行走机构共四条履带，采用双泵和电液控制，能够方便灵活地实现前进后退及转向。截割部、机身升降以及转载机的回转及升降均由同一个泵供油，并采用多路阀操纵控制。选采机能精确地水平切削一定深度的岩体，实现对煤、岩的分层选采，还能一次性完成矿体的破碎及装车，极大地提高了露天煤矿的经济效益。
 
 关键词   露天煤矿  复合煤层  选采机  液压传动
 
 
 
Abstract
 
Since China's surface mine exist a large number of complex seam，at present，while the composite coal mining is in lack of the necessary means and equipment，it makes recovery rate of the surface mine difficult to raise. There is an urgent need to make a research and exploration to the mining equipment of complex seam，the requirement of which are precise，mining independent seam selectively，and this new equipment should be suitable for mining complex seam containing ore. LMXC-I-open mining-selection machine is new model which researched and developed on the basis of the roller open shearer，it can effectively mining complex coal，improve the recovery rate of surface mine. The cutting department and the fuselage movements，running track and republish the driving machine and the rotary movements of LMXC - I-open mining-selection machine are used hydraulic driving technology，the hydraulic system uses open system. Include a total of four walking tracks，double-pump and electro-hydraulic control system, flexible and convenient way to achieve moving and retreating. Movement of the cutting department and the fuselage department，and rotary movement of the landing reproduced machine are driving by the same pump, multi-way valve manipulation. Election mining machine could cut the depth of the rock on level precisely，and achieve elective mining on coal and rock，it can complete the ore crushing and loading in the same time，which would greatly improve the cost-effectiveness of the surface mine. 

 Key words  surface mine  complex seam  mining-selection machine                   hydraulic drive