Swing type screening machine for road and bridge construction

The invention discloses a swing type screening machine for road and bridge construction. Comprising a fixed shell, a screening cavity, a funnel, a first elastic connecting sleeve, a first swing screening mechanism, a first guide groove shell, a second swing screening mechanism, a second guide groove shell, a third swing screening mechanism, a third guide groove shell, a first collecting barrel, a second collecting barrel, a third collecting barrel, a collecting box, a second elastic connecting sleeve and a grading driving mechanism. The device has the advantages that the device is reasonable and simple in structure, low in production cost and convenient to mount, the motor is started to drive the transmission shaft to rotate, and the transmission shaft rotates to drive the small driving gear, the middle driving gear and the large driving gear to rotate; the rotation of the driving pinion, the driving medium gear and the driving gearwheel respectively drives the movable gearwheel, the driven medium gear and th