Patent ID: 8544774
Filing Date: 2013-10-01
Classification: B02C

Abstract:
1. A method of protecting a roller crusher from uncrushable objects, said roller crusher having two generally parallel rollers arranged to rotate in opposite directions and separated by a gap, said method comprising the steps of: detecting an uncrushable object in an in-feed stream of material to said roller crusher, opening said gap between said rollers to a by-pass width, which is significantly larger than an operational width, such that said uncrushable object is permitted to pass through said gap, restricting an in-feed to said gap, such that material is fed to said gap at a restricted in-feed rate, determining that said uncrushable object has passed through said gap, reducing said gap to said operational width, and opening said in-feed to said gap, such that material is fed to said gap at an operational in-feed rate.