Single shaft oval vibrating screen

The utility model discloses a single shaft oval vibrating screen which comprises a single shaft circular vibrating screen. A screening plate is mounted in a single shaft circular vibrating screen body. Secondary oval vibrating springs are evenly arranged between a supporting base of the screening plate and the single shaft circular vibrating screen body. A coupling is mounted, outside the vibrating screen body, at one end of an adjustable eccentric block vibrating shaft which is mounted inside the vibrating screen body. A motor is connected with an outer end shaft of the coupling. Pedestals are respectively arranged below the motor and the vibrating screen body. Primary springs are mounted between the vibrating screen body pedestal and the vibrating screen body in a balanced mode. The screening plate is a stepped rod screening plate. Due to the fact that the coupling is a quincunx coupling. The vibrating screen body is driven to work by a group of single shaft vibrators and the vibrating locus of the screening plate turns into oval through the secondary springs at the same time, amplitude is increased two to three times, holes are prevented from being blocked, and screening efficiency is improved.