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建立了回转式破碎机动态啮角变化规律的数学模型，分析了啮角随破碎辊转角φ和排料口宽度b变化的规律。
The mathematic model of the dynamic nip angle variation of the rotary crusher was established. The variation of the nip angle with the angle φ of the crushing roller and the width b of the discharge port was analyzed.