1.The contents of the utility model. To achieve the above purposes, the utility model provides the following technical scheme. A screen is included in an anti-blocking vibratory separator. The center of the screen is connected with an elastic pull rope, and a hinge wheel is arranged under the pull rope and the lifting end is wound on the hinge wheel. The circular surface of the reaming wheel is open with teeth, and a cylindrical notch gear is arranged on one side of the reaming wheel. The notched gear comprises notches and open teeth distributed on the circular surface, and a motor is connected at one end of the notched gear. Through the adoption of the above technical scheme, the meshing and sliding between the notch gear and the hinge wheel are used to drive the pull rope to do the periodical pull-release and pull. Due to the elasticity of the mesh, the mesh under the periodic action of the pulling rope will continuously upward impact on the surface of the mesh, ejecting particles blocked in the mesh and throwing out the mesh hole. It can achieve the function of cleaning the mesh, effectively prevent particles from blocking in the mesh, improve the screening efficiency. Besides it is no longer necessary to clean the screen by hand, which reduces the labor intensity of workers, improves the operation stability and effective operation time of equipment, and increases the overall production efficiency.

2.Specific mode of implementation. The invention discloses an anti-blocking vibratory separator, which comprises a screen and a screen cleaning mechanism. The screen cleaning mechanism consists of pulling rope and hinge wheel. One end of the pulling rope is fixed and connected to the center of the screen, and is set perpendicular to the water surface. Both ends of the circumferential surface of the reaming wheel are open with teeth and one side of the rubber wheel is provided with a notch gear. One end of the notch gear is connected with a motor, and the circumference of the notch gear has notch. The notch gear and hinge wheel engage periodically. When the hinged wheel and the notched gear are opposite each other, there is no interference between them. The gap accounts for one third to one fourth of the circumference surface of the gap gear, preferably we select one third, so that the hinge wheel turns outside the mesh area of the notch gear, it can be successfully reset within the time after the notch passes, avoiding the damage of the screen caused by the tightening of the pull rope, thus improving the service life of the equipment and reducing the maintenance time. Pull rope and mesh are elastic, with the meshing and sliding between the notched gear and the hinged wheel, the pull-rope is used for the periodical pull-drop and pull. Due to the elasticity of the screen, the screen will continuously upward impact on the surface of the screen under the periodic action of the pulling rope, ejecting particles blocked in the screen and throwing out the screen hole, thus achieving the function of cleaning the screen, which can effectively preventing particles from blocking in the screen, and improving the screening efficiency. It is no longer necessary to clean the screen by hand, which reduces the labor intensity of workers, improves the operation stability and effective operation time of equipment, and increases the overall production efficiency.  In addition, the pull rope can pull the screen vertically to prevent the normal screening from being affected by bouncing the raw material particles to the same side when the screen bounce-back, avoiding particles gathering on one side and blocking the screen, which can improve the screening efficiency and improve the operation stability of vibratory separator.