Used in paper and pulp industry for breaking waste paper and wet-strength paper. This equipment is fitted with P.S. Vokes rotor, which can strengthen hydraulic cycle and fiber defiberizing and also perform continuous breaking with lower energy consumption. Rotor deviates from the center of trough body and trough body structure is D-shape, which can make the contact between pulp and rotor quicker, with higher frequency.Thereby, on condition of not increasing power and volume, capacity can be increased. Rotor and extraction disc are above the bottom plane of trough body, thus, one low-pressure flow area can form around rotor to gather heavy impurities, thereby the service life of rotor and extraction plate can be extended.