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This invention discloses a mixing impeller and a pulping device. The mixing impeller includes an impeller body with a cavity extending from its bottom end towards its top end. A flow-through hole communicating with the cavity is formed on the side wall of the impeller body. The impeller body can rotate around its own axis. During rotation, solid material is conveyed from top to bottom along the external flow channel of the impeller body; liquid material is conveyed from bottom to top through the cavity of the impeller body. The liquid material flows through the cavity and exits through the flow-through hole on the side wall of the impeller body, mixing with the solid material. The cavity and flow-through hole on the impeller body raise the liquid level, thereby increasing the mixing interface height between the solid and liquid materials and further improving the mixing efficiency.

The invention discloses a screening and filtering device for waste drilling fluid in an oil field, and relates to the technical field of waste drilling fluid treatment. The device comprises a stirring cylinder, wherein a driving component is fixedly connected to the top of the stirring cylinder, a stirring blade is fixedly connected to the output shaft end of the driving component, the bottom end of the stirring blade is located inside the stirring cylinder, a liquid inlet bucket is fixedly connected to the top of the stirring cylinder, the liquid inlet bucket is communicated with the inside of the stirring cylinder, an auxiliary screening mechanism for intercepting large-grained impurities in the waste drilling fluid to prevent the stirring blade from being worn is arranged inside the liquid inlet bucket, the auxiliary screening mechanism comprises a fixed ring rotatably connected to the inner wall of an opening at the bottom of the liquid inlet bucket, a lifting rod is slidably connected through the inner wall of the fixed ring, and compared with the prior art, the clogging of the filter screen can be reduced, and the processing efficiency can be avoided. At the same time, frequent maintenance and replacement of the filter screen are not required, and the use cost is reduced, and large-grained impurities can be avoided from entering, rubbing against the stirring blade, and accelerating the wear thereof.