What does the crushing machine do
The crushing machine can reduce the particle size of the material to a certain size and increase the surface area of the material to improve the effect of its physical action or chemical reaction. speed; separate the different components in the material after pulverization, to separate them further from each other, etc.
Grinding machinery can be used to grind flour, crush feed, grind raw clinker for pigments and cement, grind slurries to prepare suspensions, and increase the fluidity of materials, Filling. Grind the material to be artificially dried to speed up its drying speed, grind the catalyst and adsorbent to strengthen its catalytic efficiency and adsorption effect respectively, and grind the coal into pulverized coal to improve its combustion speed and completeness of combustion After crushing the iron ore, concentrate iron ore powder is obtained by magnetic separation or flotation, and after crushing the lead-zinc ore, lead ore powder and zinc ore powder are separated.
Development of crushing machinery
In China, the simplest crushing tool, the pestle and mortar, appeared more than two thousand years ago in China. The pestle and mortar were further evolved into the pedals from 200 BC to 100 BC. These tools use the principle of leverage and initially have the prototype of machinery, but their crushing action is still intermittent.
The earliest pulverizing machine that used continuous pulverizing action was the animal power mill invented by Gongshuban in the fourth century BC. Another pulverizing machine that used continuous pulverizing action was the roller mill, which appeared a little later than the mill. . After 200 A.D., Du Yu and others in China developed the continuous machine water roller, the continuous two water mill, the water transfer continuous mill, etc., which took hydraulic power as the driving force, on the basis of the treadmill and the animal power mill, which improved the production efficiency to a new level. Level. In addition to being used for grain processing, these machines are also extended to the crushing of other materials.
Modern crushing machinery was created successively after steam engines and electric motors were gradually perfected and popularized. In 1806, a roller crusher driven by a steam engine appeared; in 1858, Black in the United States invented a jaw crusher for crushing rocks; in 1878, the United States developed a gyratory crusher with continuous crushing action, and its production efficiency is higher than that of intermittent crushing. Jaw crusher with crushing action; In 1895, William of the United States invented the impact crusher with lower energy consumption.
At the same time, grinding machinery has also developed accordingly. In the early 19th century, a widely used ball mill appeared; in 1870, on the basis of the ball mill, a rod mill with uniform discharge particle size was developed; 1908 In the same year, a self-grinding machine without grinding media was created. From the 1930s to the 1950s, the United States and Germany successively developed vertical shaft type medium-speed coal mills such as roller bowl coal mills and roller disc coal mills.
The appearance of these crushing machines has greatly improved the efficiency of crushing operations. However, due to the differences in the crushing characteristics of various materials, the particle size requirements of different industries are also different from each other, so a variety of crushing machines have been created to perform crushing operations according to different working principles, such as wheel mills, vibration mills, Turbo mill, jet mill, fan coal mill, sand mill, colloid mill, etc.
In the early 1970s, large-scale gyratory crushers with an output of 5,000 tons per hour and a maximum feed diameter of 2,000 mm, and colloid mills that can grind materials down to a particle size of less than 0.01 microns have been manufactured.
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