機(jī)械設(shè)計(jì)外文翻譯--氣動(dòng)馬達(dá)及工具-機(jī)械設(shè)計(jì)(已修改)
2025-05-31 23:41 本頁面
【正文】 1 本科畢業(yè)設(shè)計(jì)（論文） 外文資料及翻譯 年 級 : 2020 級 學(xué) 號 : 20207657 姓 名 : 專 業(yè) : 工程機(jī)械 指導(dǎo)老師 : 2020 年 5 月2 Loading machines For materials handing in construction,use is made of has shown that excavators are less effective in the capacity of loads in quarries and storages of nonmetallic materials than loaders. By the kind of loads handled,loaders are classified as forklift loads and scooping loaders for loose loaders are divided into singlebucket and continuousaction Multibucket loaders are generalpurpose machines suited engineering and in applications requring continuous working process. Depending on the kind of running gear,crawler and loaders have a high passblibity and develop a great thrust efftort. Wheeled loaders feature a high manoeuvrability and high traveling speeds making no damage to the road pavement and the storage areas. Unloaders are used for unloading sand, gravel, crushed stone, cement form railway cars. Power and pneumatic unloaders are used,power for unloading materials from flat cars or gondola cars(open wagons)and pneumatic for unloading cement. The main working member of forklift loaders is the fork serving to load and unload piece loads. These loaders have different change attachments. When equipped with buckets or grabs, they are used for loading loose and smallpiece materials, and the boom attachment makes these loaders suited for hoisting loads to a small heighe and sometimes for erection work in construction. Forklift loaders are operated on hardpavement areas,therefore they are mainly used in storehouse and as factory materialshanding are made on the basis of a truck therefore they are also called truck are powered by internal bustion engines or electric motors with storage batteries. Engine powered truck are used for large warehouse and stockhanding application, for general yard work and fpr loading and unloading of vehicles. Torque converter transmission provides smooth operation。 power steering and allweather cabs are options available. 3 Singlebucket loaders have a crawler tractor or a wheeled truck as a carrier mounting. The loader permits mechanization of loading construction and erection and work with the aid of change attachments,of which the main one is the bucket. The loading equipment is available in three modifications: frontend,overloading, and halfswing,jibtype. The frontend attachment provides also side overloading modifiactaion permits back unloading. Presently frontend loader with the positive displacement hydraulic drives for the attachment are most widely used. The output of multibucket loaders is 40 to 60 percent higher than of singlebucket machines at the same power rating,it is expedient to use them in brickyards,prefabricated concrete products plants,railway stations with large volumes of loadingunloading operatins and also for loading loose addition,they are suited for size grading of loose materials,for which purpose they are provided with special vibrating screens. Multibucket loaders are very efficient in unloading flatcars with side dumping of the handle loaders can be applied in the production lines of prefabricatde ainstruction products plants and also in road the latter case they are used for loading sand and gravel into drying drums and mixers. The working member of the loader is a screw feeder consisting of tow righthand and lefthand screws,which are arranged on both sides of a bucket the feeder rotates,the load
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