【正文】 ④ High speed movement work body to hanging material impact.5) Grinds (attrition)After the material and between the movement active face certain pressure and the cutting action of force, its shear stress achieved when material shearing strength limit, the material then crushes, or between material each other rubs when the cutting, the grinding function causes the material to be stave.3 Breaker classifications and use scopeThe breaker use scope as a result of the category difference and the difference, may divide into sketchily according to the breaker function way the breaker two big kinds, the breaker and the ore mill.The breaker general processing bulk material, the product granularity is thick, usually is bigger than 8. Its structure characteristic is between stave has certain gap, contacts not mutually. The breaker may divide into the bulldozer, the intermediate crusher and the small aggregate crusher. Generally speaking the ore mill processes the material is thin, the product granularity is the fine grain, may amount to , even also wants thin. Its structure characteristic is the stave part (or medium) contacts mutually, uses the medium is the steel ball, the steel rod, the broken stone or the ore block and so on. But some machineries are simultaneously have at the same time the garrulous ore and the rubbing function, like autogenously tumbling mill. The rice autogenously tumbling mill processing ore granularity upper limit may amount to 350~400, product degree of fineness reaches 100~200 goals to account for about 40%.The stave machinery which according to the stave way,the machinery structure characteris。 ② High speed movement material to fixed working surface impact。 The breaker takes the minimum dump mouth width.It is very convenient with this type putation reduction ratio, because is impossible in the production frequently to make the screening analysis to large quantities of materials, but uses this type, so long as knew the breaker to the material mouth and the dump mouth width, may calculate the reduction ratio. Is worth pointing out that,certain breakers, its dump granularity are not decided by the dump mouth size.③ Calculates with the average granularityIn this in the formula——Stave front material mean diameter。——Breaker dumps mouth width。——After stave material greatest granularity.Because the various countries39。 the obtuse edge pin roll gives the material granularity to be big. This machine is loaded with the gap adjusting device and the roll abounds elasticity protective device.American Mclanahan Corporation has produced the standard type recently, medium and the extra large type two sections and three roller s two sections of three rollers stave function replaces the stave work which two independent breakers can plete. This kind of breaker may break the raw coal or other materials down to 15. This pany makes the single roll breaker which is used for the stave rock, the ore, the crushed stone, the coal and the hard oil shale is especially effective. For coherency high or humidity big material, its product fineness pared with impact type breaker product granularity must be thinner. Under the standard speed, the crushing roller of the two sections and three rollers breaker, of which productivity is 75～600.This pany makes the Mclanahan revolving coal breaker, which is loaded with the drill hole lamina crib Rosa, using in the stave apple coal hungry medium degree of hardness the coal, and the productivity is extremely big. This machine characteristic is the driving gear and the tube bodies have the extremely precise concentricity. Tube in vivo is loaded with the wearresisting backing, and the tube body both sides give the material reason and the exdinning reason for the non resistance. This function simultaneously pletes breaks and sieves two parts in a revolution work.American Mally Pittsburg Corporation makes the stave lump coal specially the coal breaker —— “Geomantic” the double rolls breaker, the heavy double rolls breaker, the revolving breaker, two sections of four roller Geomantic breaker and the single roll breaker. The Geomantic breaker unique feature is: Using tensile strength very high gear which Mally Corporation develops, for dustproof has used the good packing assembly. When the breaker moves, can change the position of the action roller to adjust the product the granularity. This pany makes two sections of four rollers breaker is made by two double rolls breaker assembly.Luxembourg MecanArbed Corporation makes the largescale Abed pin roll breaker, used in thick garrulous or the garrulous work, stave brittleness or hard material (also moisture content big and coherent high material).This pany makes the pin roll breaker together with 13 kinds of specifications. The smallest pin roll breaker, of which actuation power is 237, and its productivity is 150~200, the product granularity is 50. The actuation power of the largestscale pin roll breaker is 2600, and productivity is 2400~3000, and the product granularity is 300~400.The Mammoth breaker made by the West German QK Corporation is one kind of single rotor hammer type breaker, and is suitable in the single roll thick garrulous hardly to the hard limestone and cement raw material. This kind of breaker altogether has 12 kinds of specifications: For the material granularity is 0～25, the actuation power is 100～3500. The Titan breaker made by this pany, can break the material is similar to the Mammoth breaker, but gives the material granularity is 1200～2300, and productivity is 220～1200, and the actuation power is 2170～2900.This pany makes impact type breaker has 18 kinds of specifications. Giving the material granularity is most greatly 400～1600, and productivity is 20～1800, and the stave product granularity is 0～150, and the actuation power is 22～2000.The HBK hammer type breaker made by this pany mainly is used in the crushed stone which the stave road building