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)-文庫(kù)吧在線文庫(kù)
【正文】 rsepower to 50 horsepower,and in speed ranging from 20 rmp to 75,000 rmp. GENERAL FEATURES OF PNEUMATIC TOOLS Pneumatic tools represent a large number of airoperated machines that are usually transported to a work area,rather than transporting the work to the tool(as in machining some metals by machine tools).In many instances,the tool is either held entirely by the hands or guided and controlled by tool may be a manufacturing plant,the an outdoor construction job,the pressor may be a manufacturing plant,the pressor may be from the pressor system is fed by means of distribution piping through a filter,a pressure regulator,and a from the lubricator may be fed through a flexible hose to the pneumatic tools are usually supplied with pressed air at about 90 pounds per square inch, are three hroad classifications of pneumatic tools(1)rotary,(2)piston,and(3)percussion. In a typical rotary pneumatic tool,the air enters the tool handle,passes through a manually operated control valve,passes through the end plates,and enters a chamber of a vanetype air air pushes the rotor form the inlet to the the outlet,the air is discharged into the typical rotary air motor possesses three to five blades,rotates at speeds of 4000 to 25,000 rpm,and develops up to 3 spindle fastened to the rotor drives a set of plaary reduction gears to supply the desired output output shaft may be equipped with a chuck for holding a drill,grinder,or some other tool. The pistontype air motor is used for tools when higher horsepower and slower speeds are desired,as in hoists and heavydrills. The percussion or hammertype air motor is found in chippers, riveters,and pavement this type of machine,the air usually passes through an exhaust valve,and then is exhausted into the piston is moved back and the driving 8 stroke,the inertia of the piston provides a hammer blow or impact to a drill,a chisel,or a bit. Compressed air permits the use of tools are relatively pact,light in weight,flexible,portable,and easy to tools are used on a very light assembly work and on heavyduty constrution speed and direction of rotation of air motors can be controlled quickly,and they can be adjusted to serve requirements by means of a control valve which throttles the flow of pressed air to the motors do not have a tendency to bee hot when they are air motor presents no spark hazard in explosive atmospheres。在筑路中，用于將砂子和礫石裝入烘干筒和攪拌機(jī)里。裝載設(shè)備有三種不同的形式，即前卸式、翻轉(zhuǎn)式和側(cè)卸式。 因?yàn)椴孳囋谟猜访嫔献鳂I(yè)，因此，主要用于倉(cāng)庫(kù)并作為工廠物料的裝卸設(shè)備。輪胎裝載機(jī)機(jī)動(dòng)性能良好。 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
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