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  　 Working process:
        In the main frame, a 100-1500 kg powered pressure spring is fixed to the roller suspender. After the grinder is put  into  effect,   the  roller  rotates  around  the  main  shaft,  and  rolls  closely against the ring pressed by the high pressure  spring  and  centrifugal  force.  And its rolling pressure ration is 1.2 times higher than that of the raymond grinder under the same power condition and the production output is raised to substantial degree.
        When  a  certain  degree  of  wear  of  roller  and  ring  is  effected, it is recommended to adjust the length of the spring  to   maintain  the  constant  pressure  between  the  roller  and  the  ring.  As  a   result, the stable output and fineness are ensured.