摘要：
Upon first glance, a cone crusher does not look like a cone. It actually is a large, rounded metal container with several industrial-strength springs circling its body. Cone crushers get their name from their inner-workings, in which a large amount of rocks are held in the top, but the opening gets 阅读全文
摘要：
As insulation, they have a number of useful properties. They resist mold and mildew and have very high insulation values. Some historic structures show evidence that earlier societies reused their rice hulls for this purpose, and the trend toward recycling in the 2000s is a return to older practices 阅读全文