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Out material grain degrees of regulation: two roll round Zhijian with wedge shaped or gasket regulation device, wedge shaped device of top with adjustment bolt, dang adjustment bolt will wedge block up pulled up Shi, wedge block will activities roll round top away from fixed round, that two roll round clearance variable big, out material grain degrees variable big, dang wedge block down Shi, activities roll round in pressure tight spring of role Xia two round clearance variable small, out material grain degrees variable small.