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毕业论文主要内容和要求：
设计参数：
总装机功率：591 KW
适应煤质硬度：f4
截割部功率：250 KW
采高范围：1.5～3.2m
滚筒截深：630 mm
滚筒转速：40 r/min
电机转速：1476 r/min
额定电压：1140 V
要求：
（1）完成采煤机总体方案设计。
（2）对截割部的传动及结构进行设计。
（3）设计完成截割部的组件、零件工作图设计。
（4）编写完成设计计算说明书。
摘 要
MG250/591-WD型采煤机是一种电牵引大功率采煤机，该机机身矮，装机功率大，所有电机横向布置，机械传动都是直齿传动，电机、行走箱驱动轮组件等均可从老塘侧抽出，故传动效率高，容易安装和维护。
本说明书主要介绍了采煤机截割部的设计计算。MG250/591-WD型采煤机截割部主要是由一个减速箱和四级齿轮传动组成，截割部电机放在摇臂内横向布置，电动机输出的动力经由三级直齿圆拄齿轮和行星轮系的传动，最后驱动滚筒旋转。截割部采用四行星单浮动结构，减小了结构尺寸，采用大角度弯摇臂设计，加大了过煤空间，提高了装煤效果。
在设计过程中，对截割部的轴、传动齿轮、轴承和联接用的花键等部件进行了设计计算、强度校核和选用。本说明书主要针对主要部件的设计计算和强度校核进行了叙述和介绍。
此外，还对MG250/591-WD采煤机的使用与维护进行了说明，以便能更好的发挥该采煤机的性能，达到最佳工作效果。
关键词：采煤机；截割部；减速箱；行星轮系；传动齿轮；设计
ABSTRACT
The MG250/591-WD type mining machine is that a kind of electricity draws the high-power mining machine, this machine fuselage is low, Installation is large in power,all electrical machineries are fixed up horizontally, mechanical drive is all the transmission of straight tooth, electrical machinery, walk case drive wheel package etc. can take from old pool side out, so the transmission is high in efficiency, easy to install and safeguard.
Calculate in design which cuts the cutting department of main introduction mining machine of this manual. It is made up of a gearbox and moderate breeze gear wheel transmission that the MG250/591-WD type mining machine cuts the cutting department, cut the electrical machinery of cutting department and put to fix up horizontally in the rocker arm, the power that the motor outputs leans on a round of transmission of department of gear wheel and planet round via the tertiary straight tooth, urge the cylinder to rotate finally. Cut the cutting department and adopt the floating structure of four planetary forms, have reduced the physical dimension, adopt the large angle to curve the rocker arm to design, have strengthened the space of coal, have improved the coal result of putting.
In the course of designing, to cutting the axle of the cutting department, gear wheel of the transmission, parts such as the bearing and spline linking using,etc have designed to calculate, the intensity is checked and selected for use. This manual mainly designs for main part one calculating to check with the intensity have narrated and introduced.
In addition，returning use for MG250/591-WD mining machine and maintenance proves,In order to be able to good full play performance of person who should mine, reach the best working result.
Keyword: Mining machine Cut the cutting department Gearbox A department of planet Gear wheel of the transmission Design
目 录
1概述1
1.1采煤机的发展概况1
1.2国内电牵引采煤机的技术特点及趋势1
1.2.1采煤机的技术特点1
1.2.2采煤机的发展趋势2
1.3采煤机类型及组成3
1.3.1采煤机类型3
1.3.2采煤机的组成3
1.4采煤机总体方案的确定4
1.4.1．适用范围4
1.4.2．主要技术参数4
1.4.3整机主要特点5
1.4.4主要结构及组成确定6
2截割部的设计及计算8
2.1电动机的选择8
2.2总传动比及传动比的分配8
2.2.1总传动比的确定8
2.2.2传动比的分配8
2.3截割部传动计算10
2.3.1各级传动转速、功率、转矩10
2.3.2 截割部齿轮设计计算12
2.3.3截割部行星机构的设计计算34
2.3.4轴的设计及校核56
2.3.5 轴承的寿命校核65
2.3.6 花键的强度校核66
3 采煤机的使用和维护68
3.1润滑及注油68
3.2地面检查与试运转68
3.3下井及井下组装69
3.4采煤机的井下操作..........................................69
3.5机器的维护与检修70
结 论72
参考文献73
翻译部分
英文原文74
中文译文78
致 谢81
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