【正文】 accelerate(or speed up)rapidly,because the pressed air energy can be released at a high rate. Air motors are available mercially in sizes ranging from 1/10 7 horsepower 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。 氣動(dòng)馬達(dá)的特點(diǎn) 氣動(dòng)馬達(dá)可以在易爆的空氣中安全工作，并且具有安裝成本低，加速快速，啟動(dòng)轉(zhuǎn)矩大的特點(diǎn)。 商用馬達(dá)的型號(hào)功率范圍從 1/10 馬力（ 1 馬力 =）至 50 馬力，速度范圍從 20rpm 到 75000rpm。 沖擊式或氣錘式氣動(dòng)馬達(dá)主要應(yīng)用于切削、打鉚機(jī)、路面破碎機(jī)。某些工具式可雙向的，轉(zhuǎn)子的旋轉(zhuǎn)方向式任意的，而這些工具式不可逆雙相旋轉(zhuǎn)的。鉆桿的一端是柄，另一端是鉆頭。氣動(dòng)馬達(dá)的速度可以調(diào)整，轉(zhuǎn)向是可以變化，且在過(guò)載時(shí)能停止工作而不受損壞。 磨削工具：磨削工具包括研磨器、打磨器和沙光機(jī)。典型的旋轉(zhuǎn)式氣動(dòng)馬達(dá)有 3－ 5 個(gè)葉片，轉(zhuǎn)子速度在 4000 到25000rpm 之間，功率可達(dá)到 3馬力。輸入氣動(dòng)馬達(dá)的氣壓是可調(diào)節(jié)的，所以當(dāng)螺釘?shù)臄Q緊力達(dá)到一個(gè)恰當(dāng)值時(shí)，氣動(dòng)馬達(dá)就停止。于是壓縮空氣帶動(dòng)轉(zhuǎn)子旋轉(zhuǎn)。多斗裝載機(jī)的提升機(jī)把物料卸在傳送帶上，再由傳送帶將物料運(yùn)送到設(shè)備中。還可以選 配動(dòng)力轉(zhuǎn)向及全天候駕駛室。單斗裝載機(jī)式通用機(jī)械，適用于多種條件下作業(yè)。行走速度快，對(duì)公路路面和存活地面從不產(chǎn)生破壞作用。前卸式機(jī)構(gòu)只允許從裝料的一側(cè)卸料；側(cè)卸式機(jī)構(gòu)是側(cè)面卸料；翻轉(zhuǎn)式機(jī)構(gòu)則從后面卸料。therefore,it can be used in oil refineries and other plants that the problem of example of explosive motors are used under wet and humid conditions,because there is no electric shock hazard. Among the many applications and users of pneumatic tools are: agricultural equipment manufacturers, aircrafe manufacturers, ammunition depots, automotive shops and plants, bakeries, boiler shop, can factories, cement plants, coal mines, construc