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At present several hundreds Hazemag impact type breakers have been used in the limestone and other mines. In which majority breakers productivity has all surpassed for 500 .
American Hewitt-Robins Corporation is producing the double rolls type and three rolls type breaker, the impact type breaker and the hammer type breaker. The double rolls type breaker is used in the process load big work, its productivity surpasses for 810 , this machine has used the hydraulic pressure crushing roller installment, and the over-load protection spring and the oak rubber tire drive type. This company produces 24 inches 48 inches three rolls both sides coal washing used the breaker, and has the small crushing roller hydraulic unit and the belt pulley drive. Productivity (stave product granularity is when 2 inches) may amount to for 320 .
The Hewitt-Robins impact type breaker is one kind of high efficiency, big the reduction ratio impact type breaker. Its specification respectively is 36 inches 54 inches and 48 inches 66 inches. This machine productivity is decided by the riddle through whole size. When the riddle clear size of opening is 3.5 inches, its productivity may amount to for 900 .
This company also makes two kinds of specifications the hammer type breakers, namely: 36 inches 32 inches and 48 inches 32 inches, its riddle lattice bar and the spacing all are adjustable. This kind of hammer type breaker productivity may amount to for 190 , the rotation is 1350 . But the special high speed large-scale hammer type breaker rotation is 1800 .
West German KHD Humboldt Wedge AG Corporation makes many kinds of the impact type breakers. The PEG impact type breaker is used for the thick garrulous as like limestone, the gypsum and so on mineral. This machine has 9 kinds of specifications, and its productivity may up to 1650 , may amount to 1.6 for the material granularity, the product granularity is 0~15 . This company makes the PEF impact type breaker is very small for the material granularity, may amount to 0.75 , and the product granularity is 0~44 . This company also made the PEK impact type breaker used in the pulverized coal work, and some 10 specifications, biggest productivity amounted to for 2000 , amounted to 0.75 for the material granularity. KHD Corporation makes the WB25 double rolls breaker, is suitable for the stave medium degree of hardness material. This machine is loaded with the double crank which connects with the rack (wrist plate) to install, thus has guaranteed the stave strength reasonable distribution. This kind of breaker diameter is 1.25 , the width is 3 , can break the medium degree of hardness material, it gives the material granularity is 250 , the product granularity is 75 , productivity is 2223 . The breaker riddle gap may through the mechanical way adjustment, and is loaded with the over-load protection.
Soviet Machinoexport Corporation produces the impact type breaker, is used for the stave medium degree of hardness the wear-resisting ore. This kind of breaker needs the actuation power is small, but the reduction ratio is big. This company also makes many kinds of pattern rotor type breaker which is used in thick garrulous, garrulous and broken bits, having SMD-85A and SMD-86A; SMD-75 and the SMD-94A. These two kinds of rotor type breakers are both the single rotor breaker. The hydraulic unit is the material and when the stave cavity jamming which is used for to release cannot break carries on the unloading.
The DDZW-15 12 double pin rolls breaker is made by the company is used in the stave intensity reaching as high as 200 mega bars materials, and its stave productivity is 50~150 . The pin roll may be the obtuse edge or is the gentle centrums; 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 breaker.A two sections of three rollers stave function replaces the stave work which two independent breakers can complete. This kind of breaker may break the raw coal or other materials down to 15 . This company 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 compared 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 .