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After the 1990s, along with further China's reform and opening up, the coal sales market has also undergone a greater change. People put forward higher requirements on coal preparation technology and equipment. Including to reduce the content of fine particles of coal broken after product, the product particle size uniformity, reduce the limit granularity increase processing power, so as to promote the development and progress of the crusher. First Coal Research Institute, Tangshan Branch has developed a the 2PL series crusher. The crusher in technical progress is canceled the original double roll crusher concession spring safety device, the double crushing rollers fixed, the use of new technologies and materials to prevent hard to broken hard object damage broken teeth broken tooth, which can be strictly Control crushed product in excessively large particles. The 1994 level items Mountain Coal Design Institute of Zhengzhou Great Wall metallurgical plant research and development a TFP500 Series hierarchical broken machine. The series crusher single motor drive, the fluid coupling overload protection. Its transmission to the motor drive hydraulic coupler and drives a pair of bevel gears, to change the rotational direction and the drive active crushing rollers rotating, active rotation of the driven roller crushing rollers driven by the other end of a set of straight gear. Breaking tooth spirally arranged, into the compound of the smaller particles are easily discharged through the gap between the crushing rollers, large shear and tensile force of the teeth to be crushed, to improve the conventional crusher material uncontrolled always broken. The mid-1990s, Henan Laiwu Coal Mine Machinery Factory introduction of German technology, development and production 2PGL Series Double Roll powerful and efficient crusher. The series crusher dual-motor, dual hydraulic coupler, double sets gearbox direct coupled drive, a broken roller hydraulic system manually movable to adjust the pitch between the teeth roll, thereby to control the discharge granularity. The machine has a fluid coupling overload, overload protection and electronic control, difficult broken hard objects can effectively prevent damage to the broken tooth. Compact structure, low body height, impact load. Over the same period, the Coal Research Institute, Tangshan Branch have developed 2PLF series of graded crusher 2FJP600 series of powerful classification crusher, 4PGG series crusher and DP series of single teeth roll crusher. 2PLF series of graded crusher drive formally V-belt pulley transmission, transmission simple structure, low failure rate. The large pulley accumulator, so the required motor power than direct-coupled drive small. Double Roll Crusher, broken teeth bullet style to the way surfacing carbide, high strength, high crushing efficiency and ease of repair after wear. The powerful double roll crusher grading 2FJP600 series respective to the direction of rotation of the two side walls, teeth roll crusher board using assembled, broken teeth surfacing Carbide better toughness cast matrix, not only the intensity can be hard object crushing hard broken, but broken teeth "I would rather bend not fold. When difficult chopped hard objects the card bending broken teeth, the scene does not need to replace the broken boards and broken teeth directly repair. Equipped with a comb plate at the both side walls, respectively, and has two functions: ① the crushing process is completely cut, stretch broken, and difficult to produce a pulverized material; ② since rod bar screen role. Through the material to be broken, without the broken chunks of material screened out, and strictly control the granularity of the crushed product, so that the the broken material three-dimensional size can be controlled. Two toothed rolls can also be rotated to the direction of their respective sidewalls into the compound has reached the desired particle size of the material was used without secondary crushing. Directly discharged from the discharge opening in the discharge opening between the teeth roll teeth roll combs, thereby reducing energy consumption and produce extruded broken too crushed. The two crushing rollers have two separate sets of drive means, so that the two crushing rollers work independently. Actually broken into the quantity change work systems, open into the material came from a stand-alone, into material for a long time to open the dual, the user is more energy-efficient. Each crusher with A, B, C-tooth, each tooth corresponds to a product size, user by replacing the tooth to adjust product granularity is no need to replace the crusher machine, reducing user's repeat Investment. In addition, since the series crusher crushing strength, process layout does not require hand-selected belt manually pick Dagan raw coal does not need pre-screening process directly into the crusher, coal preparation process is simplified and reduced plant height, reducing coal preparation plant construction investment and production costs.
