【机械类毕业论文中英文对照文献翻译】电力机车简述
收藏
资源目录
编号：77692718
类型：共享资源
大小：20.49KB
格式：RAR
上传时间：2020-05-07
上传人：柒哥
认证信息
个人认证
杨**（实名认证）
湖南
IP属地：湖南
6
积分
- 关 键 词：
-
机械类毕业论文中英文对照文献翻译
机械类
毕业论文
中英文
对照
文献
翻译
电力机车
简述
- 资源描述：
-
【机械类毕业论文中英文对照文献翻译】电力机车简述,机械类毕业论文中英文对照文献翻译,机械类,毕业论文,中英文,对照,文献,翻译,电力机车,简述
- 内容简介：
-
毕 业 设 计（论 文）英 文 文 献 翻 译学生姓名：艾波涛学 号：0515011233所在系部：机械工程系专业班级：05gb机制本（2）班指导教师：王小平 高工日 期：二九年六月10Brief electric locomotiveNon-electric locomotive prime mover itself, by the acceptance of the Catenary current as a source of energy delivered by the traction motor drive the wheels of locomotives. Electric locomotive with power, and thermal efficiency, high speed,overloading strong and reliable operation of the major advantages and do not pollute the environment, especially suitable for heavy transport and tunnel rail link and more, steep slope and the mountain railway. Electric locomotive is from the contact-line access to electricity, supply catenary current electric locomotives have two types of DC and AC. Since the current system is different from the electric locomotives used are not the same, basically can be divided into straight - DC Electric Locomotive, to pay - DC Electric Locomotive, to pay - directly - the exchange of the three types of electric locomotives. Direct - DC electric locomotive system using DC power supply, which are equipped with traction substation rectifier device, it will after the three-phase alternating current into direct current, and then sent to the Internet. Therefore, the electric locomotive can be obtained directly from the contact with the supply of DC Series DC traction motor used to simplify the equipment on the locomotive. The disadvantage is that the DC system voltage catenary low, generally l500V or 3000 V, contact wire request is rough, it is necessary to consume a large amount of non-ferrous metals, construction investment has increased. TAC - AC DC electric locomotive power system, the majority of the worlds countries have adopted frequency (50Hz) exchange system, or the 25 Hz low-frequency communication system. In this power system, three-phase AC traction substation will change the frequency of 25 kV single-phase AC electric industry to access the Internet after. However, the use of electric locomotives on the remains of DC Series Motor (the largest advantage of this motor speed control is simple, as long as the change in motor terminal voltage can be easily realized in a wide range of speed of locomotives. However, this kind of motor as a result of a commutator, so that both manufacturing and maintenance complex, the size is also larger), the alternating current into direct current task to complete in the locomotive. Since the catenary voltage DC system than to raise a lot of contact with the wire diameter can be relatively reduced, a reduction of the consumption and production of non-ferrous metals do not invest. Therefore, the frequency of the exchange system has been widely used in the world is paying the vast majority of electric locomotive - DC Electric Locomotive. Pay - directly - the exchange of electric locomotive AC traction motor without commutator (that is, three-phase asynchronous motor), such motors in the manufacturing, performance, features, size, weight, cost, maintenance and reliability than the commutator motor much superior. It is the long delay in the application of the electric locomotive, the main reason is speed more difficult. This locomotive traction with excellent ability, is very promising. German-made electric locomotive E120 is such a locomotive. The working principle of electric locomotive, the current contact wire, stood the locomotive pantograph After entering the main circuit breaker re-entering the main transformer, alternating current from the main traction transformer winding through silicon rectifier unit, the two groups of six parallel to the traction motor focus on the supply of direct current to produce torque traction motor, electrical energy into mechanical energy, through the transmission gear-driven locomotive drive wheels turning. Pantograph Features: electric traction locomotive power from the catenary to obtain the electrical equipment installed in the locomotive or motor car roof. Construction: Single-arm pantograph can be divided into two bow bow and arms by the skateboard, the framework, the next boom (bow with arms under the framework), chassis, or bow springs, cylinder drive to support the insulator and other components. In recent years the use of bow arm. Action principle: (1)bow up: electro-pneumatic valve by compressed air evenly into the drive cylinder, the cylinder piston within the cylinder compression spring bow down, bow or spring at this time so that the next boom rotation, raised his skateboard on the framework and by pantograph uniform increase near the contact line when there is a slow stagnation, and then contact the contact line rapidly. (2) bow down: Transmission of compressed air cylinder valve to withstand the rapid pantograph buffer row into the atmosphere, in the spring bow down under the arch or to overcome the spring force, so that the pantograph to drop rapidly from the catenary. By the quality of load current flow through the contact line and pantograph slide plate surface fluency, and engagement with the slide-line contact between the pressure, the transition resistance of the contact area, depending on the pantograph and catenary between interaction. In order to ensure the smooth flow of traction current, the pantograph and the contact line between the need to have a certain contact pressure. The actual contact pressure arch network consists of four parts: the pantograph or bow system imposed on the skateboard so that the vertical upward force of static contact pressure (usually 70N or 90N); as a result of contact with the hoisting of the flexibility inherent differences in the contact line uplift in the role of the pantograph will rise to varying degrees, so that the pantograph generated in the run up and down vibration, so that a pantograph count the quality of its own related to the alternating up and down the dynamic contact pressure; pantograph in the operation of the air flow generated by an increase in speed with the rapid increase in aerodynamic; pantograph bow of the joints in the process of lifting the damping force generated. Bow net contact pressure can reflect the intuitive pantograph slide plate and the contact line between the contacts, it must comply with the law of normal distribution, to a certain range. If too small, will increase the off-line rate; if too big, skateboarding and will have a greater contact line between the mechanical wear. In order to ensure reliable pantograph flow of quality, should minimize the pantograph to the balance of quality, increased flexibility in contact with the hoisting of uniformity. The quality of skateboarding and the Electrical and Mechanical Properties of the quality of a great influence by the flow. Hop off the catenary (overhead railway power network) sub-phase region, the brand often electrified railway in the next to see that the prohibition of double arch is designed to phase in through the insulation will not count the two-phase catenary electrical short circuit, caused by tripping substation generally 30-50 km each will have a phase insulation, which is due to the reduced voltage drop of the catenary, the maintenance of high voltage catenary, but the use of the autotransformer catenary section, the distance will be more than long, in fact, is the use of single-arch, as the existence of the two-phase short-circuit fault, too much of the time, if we do not bow down, then the pantograph in phase with one broken will be opened when the arc, the arc in the operation are likely to be stretched, pulled up another phase, the same will be short, so do not try to double-arch, and only in contact with bad weather adverse circumstances double bow, such as snow, that is, single-arch, in the paragraph should have insulation down, of course, this is too much trouble, so the technology is now in the roof plus a current sensing device, when the sensor failed to catenary current when, for example, too much of the time, automatic gates, we can solve this problem, the sensors of the current time, and then automatically switch on, of course, such a device, only a relatively new type of electric locomotive will have, such as , SS7 locomotive modular, SS9 modified the prohibition of double-arch of the signs, only to see both sides of electrified railway. Electric locomotive which the bow is the part of phase with the electric wire, also known as the pantograph. There are two electric locomotive bow, usually only after the bow (bow after bow before the non-use of the reason for this is that in order to prevent the arch wire friction material may fall into the damaged locomotive locomotive); only in inclement weather such as rain and snow , bad only when the use of dual-arch. The use of electrified railway from the current three-phase generator, in order to prevent migraine generator set, from time to distance, about 30 50 km, it is necessary to replace a similar line. Replacement of the contact point near the line, the train passed by inertia. If the train using a dual-arch, the first point of contact through the arch, and then bow contact point has not yet adopted, it means that the occurrence of two-phase short-line access, which is to be avoided. Therefore, in the vicinity of contact point, there will be the prohibition of double-arch of the signs. Electrical (electricity workflow): Catenary - pantograph - main transformer - traction motor - return lines Mechanical principle (power transmission): traction motor - wheel - car - traction bar - body - Couplers电力机车简述电力机车本身不带原动机，靠接受接触网送来的电流作为能源，由牵引电动机驱动机车的车轮。电力机车具有功率大、热效率高、速度快、过载能力强和运行可靠等主要优点，而且不污染环境，特别适用于运输繁忙的铁路干线和隧道多，坡度大的山区铁路。电力机车是从接触网上获取电能的，接触网供给电力机车的电流有直流和交流两种。由于电流制不同，所用的电力机车也不一样，基本上可以分为直-直流电力机车、交-直流电力机车、交-直-交流电力机车三类。直-直流电力机车采用直流制供电，牵引变电所内设有整流装置，它将三相交流电变成直流电后，再送到接触网上。因此，电力机车可直接从接触网上取得直流电供给直流串励牵引电动机使用，简化了机车上的设备。直流制的缺点是接触网的电压低，一般为l500V或3000 V，接触导线要求很粗，要消耗大量的有色金属，加大了建设投资。交-直流电力机车采用交流制供电，目前世界上大多数国家都采用工频（50Hz）交流制，或25 Hz低频交流制。在这种供电制下，牵引变电所将三相交流电改变成25 kV工业频率单相交流电后送到接触网上。但是在电力机车上采用的仍然是直流串励电动机（这种电动机最大优点是调速简单，只要改变电动机的端电压，就能很方便地在较大范围内实现对机车的调速。但是这种电机由于带有整流子，使制造和维修都很复杂，体积也较大），把交流电变为直流电的任务在机车上完成。由于接触网电压比直流制时提高了很多，接触导线的直径可以相对减小，减少了有色金属的消耗和建没投资。因此，工频交流制得到了广泛采用，世界上绝大多数电力机车也是交-直流电力机车。交-直-交流电力机车采用交流无整流子牵引电动机（即三相异步电动机），这种电动机在制造、性能、功能，体积、重量、成本、维护及可靠性等方面远比整流子电机优越得多。它之所以迟迟不能在电力机车上应用，主要原因是调速比较困难。这种机车具有优良的牵引能力，很有发展前途。德国制造的E120型电力机车就是这种机车。 电力机车的工作原理，接触导线上的电流，经受电弓进入机车后经过主断路器再进入主变压器，交流电从主变压器的牵引绕组经过硅机组整流后，向六台分两组并联的牵引电动机集中供应直流电，使牵引电动机产生转矩，将电能转变为机械能，经过齿轮的传递驱动机车动轮转动。受电弓功能：电力牵引机车从接触网取得电能的电气设备，安装在机车或动车车顶上。 构造：受电弓可分单臂弓和双臂弓两种，均由滑板、上框架、下臂杆（双臂弓用下框架）、底架、升弓弹簧、传动气缸、支持绝缘子等部件组成。近年来多采用单臂弓。 动作原理：（1）升弓：压缩空气经电空阀均匀进入传动气缸，气缸活塞压缩气缸内的降弓弹簧，此时升弓弹簧使下臂杆转动，抬起上框架和滑板，受电弓匀速上升，在接近接触线时有一缓慢停滞，然后讯速接触接触线。（2）降弓：传动气缸内压缩空气经受电弓缓冲阀迅速排向大气，在降弓弹簧作用下，克服升弓弹簧的作用力，使受电弓迅速下降，脱离接触网。受流质量负荷电流通过接触线和受电弓滑板接触面的流畅程度，它与滑板与接触线间的接触压力、过渡电阻、接触面积有关，取决于受电弓和接触网之间的相互作用。为保证牵引电流的顺利流通，受电弓和接触线之间必须有一定的接触压力。弓网实际接触压力由四部分组成：受电弓升弓系统施加于滑板，使之向上的垂直力为静态接触压力（一般为70N或90N）；由于接触悬挂本身存在弹性差异，接触线在受电弓抬升作用下会产生不同程度的上升，从而使受电弓在运行中产生上下振动，使受电弓产生一个与其本身归算质量相关的上下交变的动态接触压力；受电弓在运行中受空气流作用产生的一个随速度增加而迅速增加的气动力；受电弓各关节在升降弓过程中产生的阻尼力。弓网接触压力能直观的反映受电弓滑板和接触线间的接触情况，它必须符合正态分布规律，在一定范围内波动。如果太小，会增加离线率；如果太大，会使滑板和接触线间产生较大的机械磨耗。为保证受电弓具有可靠的受流质量，应尽量减小受电弓的归算质量，增加接触悬挂的弹性均匀性。滑板的质量和机电性能对受流质量影响很大。合断是接触网（火车头顶的电网）的分相区，这种牌子经常会在电气化铁路旁看到, 禁止双弓的目的是为了在通过绝缘分相时, 不会将接触网的两相电短路,造成变电所跳闸, 一般每30-50公里就会有一个绝缘分相, 这是因为要减小接触网的电压降,维持较高的接触网电压,但在采用自耦变压器的接触网区段,这个距离就要长的多,其实就是使用单弓,也一样存在使两相电短路的情况,过分相时,如果不降弓,那么受电弓在与其中一相电断开的时候会产生电弧,在运行中这个电弧有可能被拉长,拉到另一相电上去,同样会短路,所以,尽量不用双弓,只有在天气不良接触不好的情况下才用双弓,比如下雪,就是单弓,在过绝缘段时也要降下来,当然,这比较麻烦,所以,现在的技术是,在车顶上加一个电流感应装置,当感应到接触网没电流时,比如过分相的时候,自动分闸,就可以解决这一问题,感应到有电流了的时候,再自动合闸,当然,这种装置只有比较新形的电力机车上才会有,比如,SS7模块化机车,SS9改型 “禁止双弓”的标志牌，只有在电气化铁路两旁才能看到。电力机车的弓是指它与电线相接的部分，又称受电弓。电力机车共有两个弓，通常只使用后弓（使用后弓不使用前弓的原因，是为了防止弓与电线摩擦可能掉落的物质落到机车上损坏机车）；只有在雨雪等恶劣天气，接触不良时，才使用双弓。电气化铁路使用的电流来自三相发电机，为了防止发电机偏载，每隔一段距离，大约305
- 温馨提示:
1: 本站所有资源如无特殊说明，都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等，如果需要附件，请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸，网页内容里面会有图纸预览，若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供信息存储空间，仅对用户上传内容的表现方式做保护处理，对用户上传分享的文档内容本身不做任何修改或编辑，并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容，请与我们联系，我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
人人文库网所有资源均是用户自行上传分享，仅供网友学习交流，未经上传用户书面授权，请勿作他用。
川公网安备: 51019002004831号