Filtering and refining device for regenerating waste industrial lubricating oil

The invention discloses a filtering and refining device for regeneration of waste industrial lubricating oil, which comprises a device body and a U-shaped oil outlet pipe connected to the position of an oil outlet of the device body, and filtering sand cores corresponding to a filtering cavity, a cleaning cavity and a drying cavity are arranged on a filtering disc body along the circumferential direction of the filtering disc body; a piston plate acting on waste industrial lubricating oil in the filtering cavity according to pressure generated by different weights is arranged at the top end in the filtering cavity; a spraying disc for conveying a nitric acid solution at the bottom of the cleaning cavity to the top surface of the filter sand core in the cleaning cavity to wash and dilute the filter sand core is arranged in the cleaning cavity; and a drying pipe for drying the upper surface and the lower surface of the filter sand core in the drying cavity is arranged in the drying cavity. According to the devi