difficult, not hating; blueprints, not rhetoric; words and simple, but full of love, truth, passion, entrepreneurial passion. Take this opportunity, my inspirational quotes Li Dazhao's classic "iron specialise in uplifting blend with the article" gave everyone, with a view on how to do well under the new situation of township and village leaders inspire and help, and also share with you. A good play to create iron shoulders strong arms, to assume the burden be passed; only specific qualities, will it be possible in specific areas to create a world. In my view, village chiefs in the new situation, we must first have five basic quality. One ambition is to pioneer. "Who is handsome." People only high-minded can stimulate the flow of momentum to become brave and persistent, become quiet and powerful. Township and village party "leaders", within their respective jurisdictions, political stability and economic and social development issues, decisions and orientation depends to a large extent because of your. Everybody in village chiefs and the positions, both the trust of the masses, the Organization's trust, more ability to you, fully affirmed the moral and other qualities. Therefore, we must always maintain the historical mission and social responsibility, and our ideal tree rooted in the hard work of the soil, with indomitable spirit, indomitable courage to open up a new situation of villages and towns. To have a feeling of closeness to the second. "The people and country." Our business foundation in the people's blood in the people power people. Advanced decisions of the party cadres to the feelings of the people is an eternal theme. Fan Zhong-yan, called "first, and enjoy comfort about others", Zheng Banqiao's also wrote a "Ya Chai lay listening to the rustling of bamboo, the suspect is suffering. Cao County officials, little my, a total turn off. "Old of feudal official even has so feelings, alone we is to" serving "for purposes of people servant does? we more should always hold with on people of deep feelings, heart Department masses of leading visited tea, care masses of emotions thoughts complained, always insisted put masses of interests put in first, consciously from itself do up, from small do up, from masses most care, and most directly, and most reality of interests problem grabbed, real do love for people by Department, and right for people by with, and Lee for people by conspiracy to. Three with the fame of mind. "Non-indifferent not insist your dream, without serenity not go far." Ascension to fame is morality, is the sublimation of the soul. As Township and village, be sure to maintain a normal state of mind, establish a correct viewpoint on power, position and values and Outlook, as fame is light like water, depending ... 50 km, also red and like hundreds of thousands of the KMT military combat, but he went on to collect a variety of newspapers and magazines, and then race against time to pore over. As long as the study of mind, it is not necessary to come to the library, workshops, into the villages, people learned farming techniques, problem-solving methods, participation in焊条电弧焊与电弧切割设备的基本结构和工作原理 图3—6焊机分类 焊条电弧焊所用焊机按电源的种类可分为交流弧焊机和直流弧焊机两大类。
其中直流弧焊机按变流的方式不同又分为：弧焊整流器、逆变弧焊机和旋转式直流弧焊发电机(现已淘汰)等每一类型的焊机根据原理和结构特点又可分为多种型式，具体见图3—6 一、交流弧焊机 (一)结构 交流弧焊机的三个类别的结构分别如图3—7～图3—9所示 图3—7 BX1—330交流弧焊机1—初级绕组；2、3—次级绕组；4—动铁芯；5—静铁芯；6—接线板；7—摇把 图3—8 BX2—500型(同体式)焊机结构示意图1—固定铁心 2—初级绕组 3—次级绕组 4—电抗线圈 5—活动铁心 图3—9 BX3—300型(动圈式)焊机结构示意图1—初级线圈 2—次级线圈 3—铁心 (二)工作原理 目前应用最广泛的“动铁式”交流焊机如图3—7所示它是一个结构特殊的降压变压器，属于动铁芯漏磁式类型焊机的空载电压为60～70V工作电压为30V，电流调节范围为50～450A铁芯由两侧的静铁芯5和中间的动铁芯4组成，变压器的次级绕组分成两部分，一部分紧绕在初级绕组1的外部，另一部分绕在铁芯的另一侧前一部分起建立电压的作用，后一部分相当于电感线圈焊接时，电感线圈的感抗电压降使电焊机获得较低的工作电压，这是电焊机具有陡降外特性的原因。
引弧时，电焊机能供给较高的电压和较小的电流，当电弧稳定燃烧时，电流增大，而电压急剧降低；当焊条与工件短路时，也限制了短路电流 焊接电流调节分为粗调、细调两档电流的细调靠移动铁芯4改变变压器的漏磁来实现向外移动铁芯，磁阻增大，漏磁减小，则电流增大，反之，则电流减少电流的粗调靠改变次级绕组的匝数来实现 该电弧焊机的工作条件为应在海拔不超过1000m，周围空气温度不超过+40℃、空气相对湿度不超过85％等条件下使用，不应在有害工业气体、水蒸汽、易燃、多灰尘的场合下工作 二、直流弧焊机 (一)结构 由于整流或直流弧焊机与直流弧焊发电机比较，因没有机械旋转部分，具有噪音小，空载损耗小、效率高、成本低和制造维护简单等优点因此，有取代直流弧焊发电机的趋势，在这里只介绍整流式直流弧焊机整流式直流弧焊机常用型号如ZXG—300、ZXG—400等硅整流电弧焊机是利用硅半导体整流元件(二极管)将交流电变为直流电作为焊接电源图3—10为硅整流电弧焊机的结构示意图 图3—10 硅整流电弧焊机1—硅整流器组 2—三相变压器 3—三相磁饱和电抗器 4—输出电抗器 5—通风机组 (二)工作原理 工作原理见图3—11。
接通开关K1，通风机组FM运转，风压开关KEY闭合，主接触器Jc-1闭合，三相弧焊变压器B1工作与此同时Jc-2闭合，控制变压器B2工作，磁放大器运行，硅整流器工作，输出一定的直流电压，这就是焊机的空载电压由于没有焊接电流，磁放大器的电抗绕组FD电抗压降几乎为零，使焊机输出端具有较高的空载电压，便于引弧当施焊时，由于有输出，形成电流，电抗绕组FD通过交流电，使其得到较大的电抗压降，并随电流的增大，电抗压降随之增大，从而得到陡降外特性当短路时，由于短路电流很大，FD通过的交流电急增，它产生的电抗压降使工作电压几乎接近于零，这就限制了短路电流 图3—11 ZXG—300型硅整流电焊机电气原理图 改变控制回路磁盘电阻R10，使磁放大器控制绕组FK中直流电发生变化，铁芯中的磁通就相应发生变化，从而改变了磁放大器交流绕组FD的电流为减少网路电压波动对焊接的影响，在控制回路中采用了铁磁谐振式稳压器，以保证激磁电流的稳定，减少对焊接电流的影响 按动K2，通风机组FM停止工作，风压开关KEY开启，主接触器Jc-1断开，主回路断电同时Jc-2断开，控制回路断电，焊机全部停止工作 焊接电流的调节依靠面板上的电流调节控制器，来改变磁放大器控制或线圈中直流电大小使铁芯中的磁通发生相应变化，从而调整了焊接电流的大小。
热将接线板烧毁或使由焊钳过。