机械外文翻译

机械外文翻译 中文译文 悬臂纵轴式掘进机的总体设计 总体设计是机械产品设计过程中的重要内容和主要环节，它是在设计之后紧接着进行的设计工作。悬臂纵轴式掘进机(以下简称掘进机)的总体设计对整机性能的优劣起着决定性的作用，并决定了各总成、系统、各部件之间的协调性，统一性和匹配关系，从而获得总体的高端 性能和较好的技术经济效益。 掘进机的总体设计，主要包括以下内容: 1)据设计任务书选择机型及各部件结构型式 2)定整机的主要技术性能参数，包括尺寸参数、重量参数、运动参数和技术经济指标 3)按照总体设计的性能要求，确定整机系统的组成 及它们之间的匹配性以及各个部件的主要技术参数 4)进行必要的总体计算，并绘制传动、液压、电控系统图等。 1(选定该机型和各个部件及其结构型式、驱动方式、并进行总体的合理布置 该项内容在确定前，首先应满足设计任务书的内容，特别是用户提出的主要要求经过调研，双方反复交换意见，达到既能满足用户(或上级)条件，又能较好的符合本企业产品发展的总体规划。 1)机型的选定 根据掘进机的用途，是用于煤矿井下巷道的掘进还是用于其他行业的工程作业，掘进机的工作条件是用于截割煤巷还是半煤岩巷，煤岩的单向抗压强度(或普氏系数f值)及岩石的磨蚀系数。同时应对照行标MT138~1995《悬臂式掘进机的型式与参数》，按其截割煤岩的最大单向抗压强度，选定机型的类别。 2)各部件结构型式、驱动方式的确定 掘进机一般由截割机构、装运机构、行走机构、液压系统、电控系统及辅助装置(如除尘装置、安全装置、遥控 监测装置)等组成。 a(截割机构。截割机构的驱动方式由交流电动机驱动，在传动系统中一般设齿形联轴节，不设机械式过载保护装置，经两级行星减速器带动主轴前端的截割头。 部分断面掘进机的工作机构有截链式、圆盘铣削式和悬臂截割式等。因悬臂截割式掘进机机体灵活、体积较小，可截出各种形状和断面的巷道，并能实现选择性截割，而且截割效果好，掘进速度较高;所以，现在主要采用悬臂截割式，并已成为当前掘进机工作机构的一种基本型式。 按截割头的布置方式，分为纵轴和横轴式两种。 纵轴式截割头的优点是:传动方便、结构紧凑，能截出任意形状的断面，易于获得较为平整的断面，有利于采用内伸缩悬臂，可挖柱窝或水沟。截割头的形状有圆柱形、圆锥形和圆锥加圆柱形，由于后两种截割头利于钻进，并使截割表面较平整，故使用较多。这种工作机构的缺点是:由于纵轴式截割头在横向摆动截割时的反作用力不通过机器中心，与悬臂形成的力矩使掘进机产生较大的振动，故稳定性较差。因此，在煤巷掘进时，需加大机身重量或装设辅助支撑装置。 目前，这种掘进机在部分断面掘进机中使用较多。 b(装运机构。它一般由装载机构和中间输送机组成。它们可采用分别驱动或集中联动方式，既可用交流电动机驱动，也可用液压马达驱动。 耙爪式是利用一对交替动作的耙爪来不断地耙取物料并装入转载运输机构。这种方式结构简单、工作可靠、外形尺寸小、装载效果好，目前应用很普遍。但这种装载机构宽度受限制(因为掘进机工作时履带行走机构一般不调动)。为扩大装载宽度，可使铲板连同整个耙爪机构一起水平摆动，或设计成双耙爪机构，以扩大装载范围。 星轮式机构比耙爪式简单、强度高、工作可靠，但装大块物料的能力较差。 装载机构方案是既能装设耙爪式也可装设星轮式，两者可以互换使用。通常，应选择耙爪式装载机构，但考虑装载宽度问题，可选择双耙爪机构，也可设计成耙爪与星轮可互换的装载机构。部分断面掘进机多采用刮板链式输送机构。输送机构一般是由机尾向机头方向倾斜向上布置的。输送机构可采用联合驱动方式，即将电动机或液压马达和减速器布置在刮板输送机靠近机身一侧，在驱动装载机构同时，间接地以输送机构机尾为主动轴带动刮板输送机构工作。这样传动系统中元件少、机构比较简单，但装载与输送机构二者运动相牵连，相互影响大。由于该位置空间较小布置较困难。 输送机构采用独立的驱动方式，即将电动机或液压马达布置在远离机器的一端，通过减速装置驱动输送机构。这种驱动方式的传动系统布置简单，和装载机构的运动互不影响。但由于传动装置和动力元件较多，故障点有所增加。 目前，这两种输送机构均有采用，设计时应酌情确定。一般常采用与装载机构相同的驱动方式。 装载机构可以采用电动机驱动，也可用液压马达驱动。但考虑工作环境潮湿、有泥水，选用液压马达驱动为好。 c(行走机构。行走机构一般采用履带型式，履带式行走机构适用于底板不平或松软的条件，不需修路铺轨。具有牵引能力大，机动性能好、工作可靠、调动灵活和对底板适应性好等优点。但其结构复杂、零部件磨损较严重。目前部分断面掘进机通常采用履带式行走机构。两条履带分别由各自的动力来驱动，可实 现原地转向。履带的驱动动力有电动机和液压马达两种，电动机驱动一般只设置一种行走速度，液压马达驱动可采用低速大扭矩马达直接带动履带链轮，或采用中速液压马达减速器带动履带链轮的传动方式，它可实现无极调速。 履带结构型式有滑动和滚动两种，当机器调动速度?10m/min的中、轻型掘进机，宜采用滑动结构型式;当机器的调动速度>10m/min的重型、特重型掘进机，应采用滚动结构型式。 d(液压系统。液压系统多采用开式系统多路阀集中控制(直接操纵或遥控操纵)方式。以往国内外多采用齿轮泵，近年来掘进机液压系统采用柱塞泵有增多的趋势。 e(电控系统。电控系统包括动力部分、控制部分和部分。电控系统必须按照煤矿井下防爆要求设计、制造、检验，必须符合 GB3836-2000中的有关规定和要求。为了提高掘进机在作业时的安全性，操作的灵活性 以及机械传动部分的故障诊断及监控功能，从实用角度考虑，装设必要的离机遥控装置、测控压力、温度、液位及关键部位的故障诊断装置。 3)总体布置 总体布置的内容包括以下几个方面: (1)确定各部件在整机说的位置，并对外形尺寸提出要求; (2)确定各部件、部件与整机之间的连接方式; (3)估算整机重量，并对各部件的重量提出要求; (4)布置各操纵机构、司机座位等; (5)审核个运动部件的运动空间，排除可能发生的运动干涉。 4) 具体要求 在掘进机总体布置时，需注意以下问题: (1)工作机构减速器减速器的进、出轴尽量同轴线; (2)悬臂和铲板的尺寸关系相适应，既有利于装载，又要避免截割头截割铲板; (3)悬臂的水平和垂直摆动中心的位置可以重合，也可以不重合。从增加机器的稳定性看，摆动这些都高度应尽量降低。在保证悬臂不与其他机构干涉的条件下，摆动中心的位置应尽量靠后，但必须保证中心在机器的纵向对称平面内; (4)当各主要部件设计出来之后。应进行校核，不满足需求时需仅需调整，使重心位于履带中心稍偏前且小于L/6(L为履带接地长度)。此外，还需求重心位置在截割机构回转台中心线之后，而且重心高度越低越好，以提高机器作业时的稳定性。 (5)总体布置应考虑左右两侧重量对称并照顾工作习惯及方便操作。司机 座一般设在机身左侧、且位于机身后部，座椅高度应保证司机的视线，使其哪个很好地操纵机器，截割出的巷道; (6)操纵台位置要适当，应保证司机操纵方便、省力。仪表显示装置的位置要便于司机观察，又不分散司机正常操作的注意力。 5)传动型式及动力元件的选择 a(传动型式及元件选择应遵循的原则 (1)技术先进性:能够改善机器性能，提高生产率; (2)经济合理性:传动系统尽量简单、元件少，易加工，价格低，维修容易，使用寿命长; 3)工作可靠性:传动系统的可靠性表现为元件使用寿命，因此也是对元件( 质量的要求; (4)适应性:元件应适应传动系统的载荷、工况及环境等条件的要求。 b(各机构对传动系统的要求及传动型式的选择 掘进机的截割、装载、运输、行走等机构一般均为分别传动，各部件受力状态及工作条件不同，因而传动型式有不同的要求。 (1)工作机构要求有较大的短时过载能力，而油马达对冲击负荷很敏感，过载负荷能力低，影响截割头正常连续运转。所以，掘进机的工作机构宜采用电动机为动力的机械传动型式。应利用体积小、功率大、过负荷能力强的专用电动机，并配备可靠的电气保护装置。根据工作机构结构紧凑的特点，通常工作机构的减速器设在悬臂内，成为悬臂的组成部分。截割头调速方式一般采用配换挂轮的，变速机构力求简单。 (2)耙装机构传动装置的特点是:减速器需装在尺寸有限的铲板下部，因而设计空间较小，工作条件恶劣。减速器经常浸泡在煤岩泥水中，卡料时易过载。 耙装、输送机构若采用机械传动，用于电动机尺寸较大，不便在输送机尾安装，一般是在铲板上部两侧安装两台电动机，作为耙装、输送机构的共同动力，这样势必使减速箱的尺寸增大，在铲板下布置较紧张。此外，考虑耙爪及链板卡链过载情况，为保护电动机不至烧毁，一般需要在减速器内设安全摩擦片离合器。 耙装、输送机构若采用齿轮油马达传动，由于尺寸小、重量轻，可使二者分别传动，从而简化传动装置，便于在铲板下布置，便于设计密封效果好的机械密封或将减速器与铲板分离，同时可实现过载自动保护。 (3)履带行走机构的驱动方式有电动机和油马达驱动两种方式。分别通过机械减速装置或直接由油马达带动履带的主动链轮运转。 机械传动的履带行走机构，一般是将电动机装于两条履带减速器后部，制动方式采用机械液压制动方式。这种传动方式传动可靠性高，电动机价格低，维修 容易，但不能调速，减速箱体积较大，巷道淋水大时，电动机易受潮而烧毁。 履带行走机构采用液压传动型式，系统简单、性能较好、技术先进。液压传动的行走机构中，在液压马达型式选择及调速方式设计方面，有不同的方案。 采用低速大扭矩马达驱动，其特点是系统简单，尺寸小、重量轻，能够实现无级调速及过载自动保护。但液压马达传动复杂、制造费用高，维护较难。 采用齿轮油马达,容积效率高，耐冲击性能好，维修容易，造价较低，一台10KW左右齿轮油马达的价格只有同功率径向柱塞马达的1/10;尺寸小、重量轻。一台10KW左右齿轮油马达的重量，仅为同功率低速大扭矩马达的1/18，为电动机重量的1/13。采用齿轮油马达后，减速器尺寸虽然较低速大扭矩马达的大， -S50-13型机的减速器传动比i=328)。因此可方便地将马但较电动式的小(MRH 达、减速器、液压制动阀、紧链装置等安装于履带架中间。这种方式在技术性能上优于机械传动，在经济指标上优于低速大扭矩马达传动。因此具有独特的优点。 行走机构的调速方式有两种，一种是采用变量泵。另一种是采用分流或并流的调速方案，如MRH-S50-13型机，即在机器快速调动时，停止向装载马达供油，仅向行走马达供油，使掘进机有两种行走速度。 2(确定整机主要技术参数 掘进机整机主要技术参数包括尺寸参数 (长×宽×高)、重量参数、运动参数和动力参数。 1)尺寸参数 整机长度、宽度的大小直接与其转弯半径有关，推荐轻型机长度?7(5m，中型机长度?8(5m，重型机?l0m，对应的宽度分别为?1.6m，?2.5m，?3m。 整机的高度直接关系到它的动、静态稳定性，适应范围和通过性的好坏，因此越低越好。当今中外机型发展趋势是矮机型，中、重型机高度 1.6,2m，特轻型、轻型机的高度 1.4,1.6m。掘进机可掘巷道断面的最大、最小高度和宽度应满足设计任务书的要求。卧底深度 250~400mm,离地间隙C=B/13+84(mm)，B为两履带中心距)。中间输送机龙门口过料高度最好为 400mm，履带接地长度L与其中心距B之比应为L/B?1.6。 2)重量参数 整机自重是掘进机的—个重要参数，机重太轻，工作稳定性下降，摆动截割时会发生摆尾现象、截割效率下降，截齿磨耗率增加;机重太重时，机动性差，转向灵活性下降。—般它的自重可按w=(t)估算，式中N为截割机构功率，kW;V为截割头平均截割速度，m/s;也可参照现有掘进机用类比法来确定，机重(t)与截割功率(kW)之比为0(25,0(4。对于一般煤、岩底板，许用值

?0.14MPa;对于水软化的泥质页岩底板，

?0(05MPa。 3)运动参数 截割机构的运动参数:截割头的平均截割速度V:对煤岩的单向抗压强度,,,,,ccc40MPa，V=3~3.5m/s;60MPa，V=2~2(5m/s，>60MPa(V=l~2m/s。但最终切割速度由切割技术来确定。 4)动力参数 掘进机驱动的动力源都采用交流电动机。截割机构功率大小。实际上一般采用类比法，再结合掘进机一些个性因素及经验来确定。 掘进机在作业过程中，纵轴式和横轴式部需要足够的掏槽推进力和摆动(水平方向和垂直方向)力。 根据俄罗斯(原苏联)在实验室的试验结果得知，截割煤岩的普氏硬度 f=4~6(相当于 0 C=40~60MPa)，研磨系数 F=5~7mg,mm2。截割时的摆动力 (牵引力)Pv=(1,1(34)P，P=M,Rcp，式中P为截割头上的平均截割力;Rcp为截割头平均半径;M为截割头上的额定扭矩。掏槽时的进给力(轴向推力)R;(1.8,2.5)Pv，此力不得大于履带对底板打滑时的极限牵引力。 5)技术经济指标 Q=(m3/min)，式中sx为截割头的纵向横截面积，m2:Vn为截割头的截割摆动速度，m/min。 掘进机的设计寿命，在国际上先进的产品可达 3,5年，在此期间它无需升井大修，国内产品一般为1,2年。 3.按照总体设计的要求。确定各主要部件参数及其相互之间的连接关系 1)截割机构技术参数的确定及其连接关系 (1)截割机构技术参数的确定截割头上的截齿排列一般为双头或三头螺旋线布置方式。截割头转速 n=20~65r,min，截齿尖的平均截割速度 V=1(5,2(5m,s，截割摆动速度 Vn=0.8,l0m,s。截线距离 t=20~50mm，(切煤时取大值，切岩时取小值)。平均单刀力应达到:f4级煤岩 F?2500N，f6级煤岩 F?5000N，f8级煤岩 F?12000N，截齿安装角最佳为45?,48?。 (2)截割机构的连接 截割机构悬臂安装在叉形架前端，叉形架固定在回转台上，回转台固定在机架上。根据截割机构在作业过程中的作用力和力矩，应用 MT475-1996《悬臂式掘进机回转支承型式、基本参数和技术要求》选定回转支承的结构型式，通过计算确定回转支承规格尺寸。如用户对悬臂不要求有伸缩结构，一般不推荐采用。 2)装运机构参数的确定 (1)装载机构 装载机构与中间输送机采用联动方式或单动方式，装载机构耙爪的转速一般为 25~48r,min。星轮的转速可略高一些。采用液压马达直接驱动时，最大输出扭矩应为计算额定扭矩值的 1(5倍。铲煤板的倾斜角一般为 21?,25?，它的宽度应比履带外宽大0.6,1.2m，下降最低位置不应小于卧底深度上升最大高度应达到 350~400mm。 (2)中间输送机 中间输送机的链条可采用单链或双链结构形式的圆环链，链速不应超过 0.92m/s，链条采用美国万向套筒滚子链单链时，链速不应超过 2.5m/s，一般取 1.6,2m为了满足卸载高度的变化要求，机尾应设多级升降液压缸实现升降，升起时的最小高度应为受料斗高度加300mm左右。如机尾需要左右摆动时，必须采用一条美国万向套筒滚子链，在转向位置的一侧设置单作用液压缸实现机尾左右摆动 45?，以扩大卸载的宽度。 3)行走履带技术参数的确定和连接关系 a.行走履带的驱动型式和传动方式有两种，总体设计和总体布置时确定其中一种。 (1)电动机驱动一大传动比减速器(i?250)?带动主动链轮。 一般只能确定一种行走速度 5,7.5m,min。 (2)速大扭矩液压马达一直接驱动主动链轮或中高速马达一减速箱一带动主动链轮能实现快速调动和慢速作业的需要，行走速度为0,10m/min的无级调速。 b.履带传动的连接关系 结构型式有滑动和滚动两种 ，滑动式结构简单，内阻较大，对特轻型、轻型、中型掘进机推荐采用滑动结构式。滚动式运行阻力较小，履带架底部与履带链相接触磨损小。重型和特重型掘进机推荐采用这种结构型式。履带架底部装设的支重轮，每个承载力应不小于机重50,，间距一般为履带板节距的 1.5倍。 4) 液压系统技术参数的确定 液压系统的技术参数的确定应在液压设计计算后定。系统的额定工作压力不宜高于 20~25MPa。在系统有液压马达传动动力时应设置冷却器，系统中选用串联轮泵时，额定压力宣在 20MPa以下。选用泵和马达的安裕度应为1.5左右。系统中每个回路的溢流阀调定压力为其额定压力的 1.8,2.2倍为宜。 5)电控系统主要技术参数的确定 电控系统的供电电压应按掘进机机型大小来确定压等级，特轻型、轻型机应选660V，中、重型机 型应选660V/1140V。动力部分回路中的电器元件应满足供电电的波动范围70,,115,的要求。 6)其他辅助系统 1)外喷雾系统，喷嘴设置在截割机构悬臂的前端水压为1.5 MPa。 内喷雾系统的喷嘴装置设在截割头截齿座的后面内喷雾系统的压力不低于 4MPa。对截割岩石的情况下应适当提高水压和水量。 2)内外喷雾系统总水量不得超过掘进机实际生能力的 6,8,，否则造成工作面煤泥积水现象。 4(进行必要的总体计算及系统图等 在掘进机总体设计和总体布置完成之后，整机的各个系统和主要部件的主要结构、技术参数己基本确定，对整机应进行必要的总体计算及系统图等。 1)掘进机截割机构动静态稳定性的计算。 2)各部件传动系统和液压电控系统的功率计算。 3)液压系统热平衡的计算。 4)绘制传动、液压、电控系统图。 5)绘制截割巷道断面图。 5. 结语 掘进机的总体设计是掘进机设计工程中技术设计的个组成部分。它的设计关键是总体性能参数的合理选择，各个系统和总成的优化设计水平，特别是截割机构的切割技术显得尤为重要。 本文所述掘进机的总体设计仍然是以传统设计为基础，在动力学、运动学、受力计算等方面应广泛应用现代设计方法，如概念设计、三维设计运动学、动力学仿真技术、有限元设计、优化设计等。同时，应广泛学习国际上这方面的新设计方法为我所用，提高我们的设计水平，积累我们的设计经验，搞出安全、可靠、性能优良的高端产品。 英文翻译 The vertical Boom-type Roadheader design 1 Introduction Mechanical design is in the process of product design and an important part of the main links, it is followed in programme design after the design work. The vertical Boom-type roadheader (the roadheader) to the overall design of the merits of complete machine play a decisive role, and the decision of the assembly, the system, coordination between the various components of the unity and match, to obtain the high-end performance and overall better economic efficiency technology. Roadheader design, including the following: 1)According to design project description choice type and various cellular construction pattern 2) Decides the complete machine the main technical performance parameter, Including size parameter, heavy parameter, the parameter of movement and the technical economy refer parameter, 3) According to system design performance requirement, definite complete machine system composition and between them match as well as each part main technical senate parameter, 4) The necessary whole, and the mapping of transmission, hydraulic, electronic control systems, and other plans. 2 the selected models and various components and structural type, drive, and the overall layout of the reasonable In determining the content, first task should be designed to meet the contents, especially the users of the main demands of the investigation, the two sides exchanged views repeatedly, to satisfy both users (or superior) conditions, can better meet the product development of the overall plan. 2.1 the selected models According to roadheader use, for the coal mine tunnel boring or used for other sectors of the works, roadheader working conditions for cutting coal roadway or semi-Coal Lane, the compressive strength of coal and rock one-way (or the value of platts coefficient f) and the rock abrasion factor. At the same time the control line should be superscript MT138 ~ 1995 "cantilevered Roadheader types and parameters", according to cutting coal and rock the biggest one-way compressive strength, the type of selected models. 2.2 the structure of the various components, the way the driver identified Roadheader by cutting general agencies, shipping agencies, walking, hydraulic system, electronic control systems and auxiliary devices (such as dust removal devices, security devices, remote monitoring devices) and other components. 1) Cutting agencies. Cutting the drive from AC motor-driven, in the transmission system located in the general profile coupling with no mechanical overload protection device, the two planets reducer driven spindle front of the cutting head. Some sections of the working bodies boring machine has cut chain, disc-milling and cutting-such as cantilever. Cantilever due to the cutting-boring machine body flexible, relatively small, can cut a variety of shapes and sections of the roadway, and to achieve selective cutting, but cutting good effect, a higher rate of boring, so now used mainly cantilever Cutting-and has become boring machine working body of a basic pattern. By cutting head of the layout, is divided into horizontal and vertical axis of the two. The line-cutting head of the advantages are: Transmission convenient, compact and can be cut to any shape of the profile, easy access to the formation of a cross-section and is conducive to expansion in the use of cantilever, or ditch digging, in Waterloo. Cutting head the shape of a cylindrical, cone and the cone and cylindrical, as the latter two cutting head to drilling, and the cutting surface than the formation, use it more. This is the work of the shortcomings: As the longitudinal axis of cutting head in the horizontal swing at the cutting reaction force is not passed machine centres, with cantilevered form of torque to boring machine have a greater vibration, stability is poor. Therefore, the coal roadway excavation, the need to increase the body weight or support the installation of auxiliary equipment. At present, such a boring machine in some sections of the use of more boring machine. 2) Shipment of bodies. It generally from the middle loading and conveyor components. They were driven or focus may be linked, either by AC motor drive, can also be used hydraulic motor drive. Trailing claw-is to use a turn moves the rake claws to continue to rake materials and in a reprint from transport operators. This structure is simple, reliable, small form factor, loading good effect, the application is widespread. However, such institutions loading width restricted (because boring machine running track when agencies generally do not arouse). To expand the loading width, will shovel the entire harrow board, together with the claw agencies in the level of swing, or design dual rake claws, to expand the scope of loading. Institutions than the rake-wheel-claw simple, high intensity, reliable, but with less bulk materials. Loading agency programme is not only the installation of the claw-rake-wheel can also be installed, the two can be used interchangeably. Usually, the choice rake claw-loaded, but considering loading width of the problem, may choose to double rake claws, can also be designed to rake claw-round interchangeable with the loading mechanism. Some sections boring machine use of scraper chain conveyor agencies. Transportation agencies are generally undertaken by the tail to the nose tilted upward direction of the layout. Transportation agencies can be the driver, is about to motor or hydraulic motor and reducer layout in the scraper conveyor and around the side of the fuselage, the body in the driver loading at the same time, indirectly, to transport bodies to take the initiative to the tail shaft driven scraper Transportation agencies. This drive system components in small, relatively simple bodies, but loading and transportation agencies involved in the two campaigns, mutual influence. As the location less space layout more difficult. Transmission organizations to adopt an independent driver, is about to motor or hydraulic motor layout away from the machine side, driven by slow delivery agencies. This mode of transmission drive layout simple, and filling the campaign Hubuyingxiang. However, due to transmission and more dynamic components, the point of failure has increased. At present, the two transportation agencies are used, as appropriate, the design should be identified. General loading and institutions often use the same drive. Loading agencies can use motor-driven, can also be used hydraulic motor drive. However, in consideration of the working environment and wet with mud, optional hydraulic motor drive for good. 3) Run institutions. Walking agencies tracked the general pattern, crawler-run institutions apply to the floor is uneven or soft conditions, no road track laying. Traction with large capacity, good mobility, reliability, flexibility and mobility on the floor adaptability of the advantages of good. But its complex structure, components and wear more serious. At present cross-section of the boring machine is usually used crawler-run institutions. Walking agencies tracked the general pattern, the two tracked separately by the respective power to drive, to achieve in situ. Caterpillar is the driving force of two motors and hydraulic motors, motor driver is generally set up a walking speed, hydraulic motor-driven large low-speed torque motor can be driven directly tracked sprocket, or used in the hydraulic motor speed Reducer led the drive sprocket track, it can achieve Promise governor. Tracked structure of a sliding and rolling two, when the speed machine to mobilize ? 10 m / min in the light Roadheader, should adopt the structure of sliding when the mobilization of speed machines> 10 m / min of heavy, severe Roadheader should be used Rolling structural type. 4) The hydraulic system. Hydraulic systems use of open-way valve system more centralized control (direct or remote control manipulation) way. Domestic and foreign use of the past, gear pumps, hydraulic system in recent years Roadheader used piston pump have increased the trend. 5) Electronic control system. Electronic control systems, including some power, control and inspection of the part. Electronic control system must be in accordance with the requirements of coal mine explosion-proof design, manufacture, testing, GB3836-2000 must meet the standards of the relevant provisions and requirements. In order to improve operations at the Roadheader in the security, operational flexibility and mechanical transmission part of the fault diagnosis and monitoring functions, from the practical point of view, the installation of the necessary machines from a remote control device, monitoring pressure, temperature, level and key parts the fault diagnosis device. 2.3 Layout General layout of the contents include the following: 1) Identify the components in complete machine said the location, shape and size of the request; 2) To identify the parts, components and the connections between complete machine; 3) estimates complete machine weight and the weight of all components requested; 4) layout of the manipulation of institutions, the driver's seat; 5) examination of moving parts of the movement space, rule out the possibility of interference in the campaign. 2.4 specific requirements Boring machine in the general layout, the need to pay attention to the following questions: 1) institutions into the reducer reducer, as far as possible to coax axis; 2) cantilever and spade-suited to the size of relations, not only conducive to loading, to avoid cutting the first shovel cutting board; 3) the level of cantilever and vertical position can swing the center coincidence, can not overlap. From the increased stability of the machine, these are highly swing should be reduced. In the cantilever is not guaranteed to interfere with other agencies under the conditions of swing centres are located should try to rely on, but must ensure that the machines in the centre plane of vertical symmetry; 4) When all the major components designed after. Checking should be carried out, does not meet requirements to be adjusted just so that the focus in track and less than the former center Shaopian L / 6 (L grounding for the track length). In addition, the center of gravity position in the demand for cutting bodies turret after the centerline, and Yuediyuehao high center of gravity to enhance stability when operating machinery. 5) the overall layout should consider the weight of symmetrical left and right and take care of work habits and to facilitate the operation. General driver in the left side of the fuselage and the fuselage in the rear, driver seat height should ensure that the people's attention, what good control of their machines, cutting out the rules of the roadway; 6) Caozong Tai position should be appropriate, should ensure that drivers easy manipulation, and effort. Instruments showed that the location devices for drivers to observe, not scattered normal operation of the driver's attention. 2.5 types and power transmission components choice transmission patterns and components should follow the principle of choice 1) the advanced nature of technology: machines to improve performance, increase productivity; 2) economic rationality: drive system as simple as possible, fewer components and easy processing, low price, easy maintenance, long life; 3) reliability of the work: the transmission system reliability performance for the life of components, as well as component quality requirements; 4) adaptation: the drive system components should be adapted to load, working conditions and environmental conditions of the request. Agencies to the transmission system requirements and the choice of transmission patterns . Boring machine cutting, loading, transport, walking and other institutions generally are respectively transmission, all parts of the state and subject to different working conditions, thus driving patterns have different requirements. 1) institutions require a greater short-term Guozainengli, motor oil is very sensitive to the impact load, the loading capacity of low-impact cutting head for normal functioning. Therefore, the boring machine working body should adopt the motor-driven mechanical transmission type. Should make use of small size, power, a strong capacity for electric motors, and equipped with reliable electrical protection device. According to the compact body of work features, usually work in the reducer cantilever, an integral part of a cantilever. Cutting the first governor general way with a round peg for the method of transmission organizations to simple. 2) rake with institutions transmission device is characterized by: reducer be installed in the limited size of the lower part of the shovel plate, thus design a smaller space, poor working conditions. Reducer often soaked in muddy coal and rock in the cards when the material easy to overload. Trailing equipment, transportation agencies the use of mechanical transmission, for the larger motor, not the end of the conveyor installation, the shovel is generally installed on both sides of the board two motor, with a rake, a common power transmission organizations, such bound to make the Slowdown me the size of the increase in the spade under the board layout more tense. In addition, consider the claw and rake boards linked linked overload situation, to protect the motor did not burn, the general needs of internal security in reducer friction-clutch. Trailing equipment, transportation agencies the use of motor oil transmission gear, as small size, light weight, will enable the two separate drive, thus simplifying transmission device, for the spade under the board layout, designed for good results sealed mechanical seal or reducer And shovel plate separation, while achieving automatic overload protection. 3) walk the track-driven approach and a motor-driven motor oil in two ways. Respectively, through mechanical devices or directly from the slowdown in motor oil led the initiative sprocket running track. Mechanical transmission of the walking track, with General Motors will be tracked in two reducer rear, the brake hydraulic braking by mechanical means way. This transmission mode drive high reliability and low prices of motor, easy maintenance, but not speed, slow me larger, Lin Shui major roadway, the motor easily exposed to moisture and burned. Tracked walk to adopt hydraulic transmission patterns, simple system, better performance and advanced technology. Hydraulic transmission of the walking mechanism, in the form choice and hydraulic motor speed control mode design, there are different options. The use of low-speed torque motor-driven, characterized by the system simple, small size, light weight, to achieve stepless speed regulation and automatic overload protection. However, hydraulic motor drive complex, the high cost of manufacturing, maintenance more difficult. Gear used motor oil, the volume of high efficiency, performance and impact-resistant, easy maintenance, low cost, a 10 KW around the motor gear oil prices only with the power of the radial-Sema Da 1 / 10; small size, light weight. A 10 KW gear around the weight of motor oil, with the only major power low-speed torque motor of 1 / 18, the weight of the motor 1 / 13. Gear used motor oil, although lower-speed reducer size large torque motor, but a small electric (MRH-S50-13-type plane reducer transmission ratio i = 328). So can easily be motors, reducers, hydraulic Zhidong Fa, tight chain devices installed in the middle-tracked. In this way than on the technical performance of mechanical transmission, the economic indicators better than the low-speed torque motor drive. So has a unique advantage. The walking speed in two ways: one is a variable pump. The other is the use or diversion of the flow and speed control programmes, such as the MRH-S50-13 type aircraft, that is, in the rapid mobilization of machinery, to stop carrying motor oil, only to run motor oil so that the boring machine has two Walking speed. 3 determination complete machine main technology senate parameter Mechanical Roadheader complete machine main technical parameter including size senate parameter (length ×width ×highly); weight parameter, parameter of movement and dynamic parameter. 3.1 size parameters Complete machine length, width of the size directly related to its turning radius, Recommended light-length ? 7.5 m, medium-length ? 8.5 m, heavy machine ? l0m, the corresponding width were ? 1.6 m, ? 2.5 m, ? 3 m. The complete machine relates its tendency, the static stability highly directly, the adaptation scope and passes quality, therefore lower better. The current development trend of Chinese and foreign models is the dwarf models, medium and heavy-high 1.6 ~ 2 m, special light, light machine the height of 1.4 ~ 1.6 m. Roadheader to dig the biggest section of roadway, the minimum height and width should be designed to meet the requirements of the mission. Undercover depth of 250 ~ 400 mm, ground clearance C = B/13 +84 (mm), B for the two track distance). Middle-long conveyor entrance to the expected high degree of the best 400 mm, length of track ground with the center distance L B ratio for L / B ? 1.6. 3.2 weight parameters The complete machine dead weight is the mechanical roadheader - an important parameter, the engine weight too is light, the work stability drops, when swinging cutting can occur fishtails the phenomenon, the cutting efficiency drops, truncation tooth rate of wear increase; Heavy-weight, poor mobility, flexibility to decline. The self-respect as it may be w = (t) estimates, in the N-type body for cutting power, kW; V for the cutting head on average cutting speed, m / s; can also be Roadheader with reference to the existing analog method to determine , machine-(t) and cutting power (kW) ratio of 0.25 to 0.4. For general coal, rock bottom, the allowable value

? 0.14 MPa; muddy for the water to soften the shale bottom,

? 0.05 MPa. 3.3 movement parameters Cutting the movement parameters: cutting head of the average cutting speed V: ,,on the one-way coal and rock compressive strength of 40 MPa, V = 3 ~ 3.5m / s; c ,,,60MPa, V = 2 ~ 2.5m / s, > 60MPa. V = l ~ 2m / s. But eventually cutting cc speed by cutting technology to determine. 3.4 dynamic parameters Roadheader-driven power sources are used Motors. Cutting power body size. In fact the general use of analogy, combined with roadheader some personality and experience factors to determine. Roadheader in the operating process, the vertical axis and the horizontal axis-of the need for adequate cutting edge and push forward swing (horizontal and vertical) force. According to Russia (the former Soviet Union) in the laboratory test results that the cutting of coal and rock platts hardness f = 4 ~ 6 (equivalent to 0 C = 40 ~ 60MPa), grinding coefficient F = 5 ~ 7mg/mm2. Cutting the shaking force (traction) Pv = (1 ~ 1.34) P, P = M / Rcp, in the P-cutting head for the average cutting edge; Rcp cutting head for the average radius; M for cutting the head of the rated torque. Cut the feeding of (axial thrust) R; (1.8 ~ 2.5) Pv, this force should be no larger than the floor slippery track at the limits of traction. 3.5 technical and economic indicators 32Q = (m/min), in the sx-cutting head for the vertical cross sectional area, m: Vn for the cutting head of cutting swing speed, m / min. Roadheader designed life, in the international advanced products up to 3 to 5 years, during which the need of major repair or wells, the general domestic product for 1 to 2 years. 4 in accordance with design requirements. Determine the parameters of the main components and their relationship between the connector 4.1 cutting agencies and technical parameters of the established link between 1) Cutting-agency technical parameters of cutting the head with the general pick for the double-headed or three spiral layout. Cutting head speed n = 20 ~ 65r/min, a sharp pick cutting the average speed V = 1.5 ~ 2.5m / s, cutting swing speed Vn = 0.8 ~ l0m / s. Cut-off line from t = 20 ~ 50mm, (when cutting coal from the value of all-time for small value). Average single-pole/double-throw force should reach: f4 grade coal and rock F ? 2500 N, f6 grade coal and rock F ? 5000 N, f8 grade coal and rock F ? 12000 N, pick the best angle for the installation of 45 ? ~ 48 ?. 2) Cutting the link .Cutting agencies cantilever Chaxing-installed in front of the fixed-Chaxing rotary table, the turret to the rack. According to cutting agencies in the course of operating the force and torque, the application of MT475-1996 "cantilevered Roadheader rotary bearing type, the basic parameters and technical requirements" selected rotary bearing the structural type, determined by calculating slewing ring size specifications. If the user does not require a cantilever stretching structure, is generally not recommended. 4.2 shipping agencies determine the parameters 1) Loading mechanism Loading bodies and Middle conveyor used linkage or single-action mode, loading the bodies rake claws speed is generally 25 ~ 48 r / min. Star Ferry's speed can be slightly higher than some. Using direct-drive hydraulic motors, the maximum output torque rated torque for calculating the value of 1.5 times. Shovel coal-general of the tilt angle to 21 ? ~ 25 ?, it should be the width of track, spacious than the 0.6 ~ 1.2 m, declining position should not be less than the minimum depth of undercover maximum height should be increased to 350 ~ 400 mm. 2) Intermediate conveyor Middle conveyor chain may be single or double-stranded chain structure of the ring chain, chain-speed should not exceed 0.92 m / s, using the U.S. chain of universal sleeve roller chain single chain, the chain speed should not exceed 2.5 m / s, generally from 1.6 ~ 2 m in order to meet the changing demands a high degree of unloading, the tail should be set up multi-stage hydraulic cylinders to achieve take-off and landing movements, raising the minimum height for the hopper and a high degree of around 300 mm. If the tail need to swing around, the United States must adopt a universal sleeve roller chain, to set the location of the side-effect hydraulic cylinder to achieve the tail swing around 45 ?, to expand the width of unloading. 4.3 running track and identify the technical parameters of connectivity between a)walking track drivers and transmission patterns have the following two ways, the overall design and layout determined at the time one of them. 1) Drive a motor-driven than reducer (i ? 250) ? led initiative sprocket. Can only establish a walking speed of 5 ~ 7.5 m / min. 2) The speed of a hydraulic motor torque direct drive or take the initiative sprocket of a slowdown in high-speed motor driven me a sprocket can take the initiative to achieve rapid mobilization and the need to slow operations, walking speed of 0 ~ 10 m / min of no - Speed. b) tracked the transmission link between Structure has two sliding and rolling, sliding simple structure, the resistance of larger, the special light, light and medium-sized roadheader recommend sliding structured. Rolling resistance smaller operation, crawler-crawler at the bottom and wear small chain of contacts. Heavy and severe roadheader recommend using this structure type. Track-installed at the bottom of the supporting wheels, each bearing capacity should be not less than 50 percent of weight, distance is generally tracked the plate pitch 1.5 times. 4.4 the hydraulic system of technical parameters established Hydraulic system of technical parameters should be determined in the hydraulic design calculations. The pressure should not be rated higher than the 20 ~ 25 MPa. A hydraulic motor in the system should be set up power transmission cooler, the system in the optional round series at the pump, rated pressure announced that the following 20 MPa. Selection of pumps and motors of the Anyu should be around 1.5. Each loop system in the pressure relief valve is set for the rated pressure of 1.8 to 2.2 times suitable. 4.5 electronic control system identified the main technical parameters Electronic control system of power supply voltage should be roadheader models to determine the size of pressure levels, special light, light machine should be elected 660 V, medium and heavy aircraft should be elected 660 V/1140V. Some momentum in the electrical circuit components, the power supply should meet the range of 70% to 115% of the requests. 4.6 other supporting systems 1) Spray system, cutting nozzles installed in the front organizations cantilever pressure for 1.5 MPa. Spray nozzle within the system installed in cutting the first pick in the back seat of the spray system pressure of not less than 4 MPa. Cutting rock on the case should be to increase water pressure and water. 2) Inside and outside the water spray system shall not exceed the actual health roadheader capacity of 6 to 8 percent, or stagnant water in the face of slime. 5 the overall calculation of the necessary plans and systems Such as in roadheader design and overall layout is complete with two of the main components of each system and the main structure, the basic technical parameters have been determined, theComplete machine should carry out the necessary calculations and the overall system, and other plans. 1) Cutting agencies roadheader static and dynamic stability of the calculation. 2) Transmission and hydraulic components of the electronic control system of power calculation. 3) Hydraulic system heat balance calculations. 4) Drawing transmission, hydraulic, electronic control system plans. 5) Drawing cutting sections of roadway. 6 Conclusion Roadheader design is roadheader design projects in the technical design of the components. It is the key to the design of the overall performance parameters of reasonable choices, the assembly of each system and optimize the design standards, in particular, cutting the cutting technology is particularly important. Roadheader described in this paper, the overall design is still based on traditional design, dynamics, kinematics, the calculation of the force should be wider use of modern design methods, such as conceptual design, 3D design kinematics, dynamics simulation technology, limited Yuan design and optimize the design. At the same time, the international community should be extensively studied this aspect of the new design for my use, to enhance our design standards, we have accumulated experience in the design, to produce a safe, reliable, high-performance high-end products.