Large multilayer penetration screening method and screening machine

Abstract

The invention discloses a large multilayer penetration screening method and a screening machine, belongs to the field of vibration screening machinery, and is designed to solve such problems as low treatment amount, weak screening effect and weak screen frame stress condition of a large vibration screen in a traditional multilayer classification screen. Vibrators are two rows of single shaft box type vibrators serially connected for parallel, large-gap and self-synchronization operation; the formation resultant force is a linear vibration trajectory; and an included angle between the vibration resultant force and a screen surface is 80-90 degrees to realize through screening of materials by penetrating through a screen. Two rows of serial-connected box vibrators are mounted on two independent mounting square beams of a screen frame by large span; and the center distance thereof is larger than 1/3 of the length of the screen box. A bridge vibrator mounting beam structure consisting of spring base reinforcing rib plates, the vibrator mounting square beams, the single shaft box vibrators and reinforcing beams enables the screen frame to achieve balanced stress and improved rigidity. The screening machine has such characteristics as reasonable and compact structure, stable self-synchronization, reliable operation and convenience in screen and vibrator installation and adjustment, and is suitable for large-scale development of multilayer screening machines.

Description

technical field [0001] The invention belongs to the field of vibration screening machinery, and mainly relates to a large-scale multi-layer penetration screening method and a screening machine with large-scale multi-layer screening surface, high screening efficiency, strong structural rigidity, good screen penetration performance and stable self-synchronization operation. Background technique [0002] The existing 2-4 layer grading screens are mainly circular vibrating screens: the motion track of the sieve plate is circular or elliptical, and the vibrator is arranged between the upper and lower layers or between the second layer and the third layer, and its structure adopts a single-axis Drive structure or dual-axis forced synchronous drive structure, the inclination angle of the screen surface is 15-21°. In order to achieve the required service life of the bearings, a vibrator driven by a single shaft (with 2 to 4 bearings installed) is generally used if the screen surface...

AI Technical Summary

Problems solved by technology

There are small spacing of forced synchronization, concentrated force on the screen frame, uneven force at close range, and unstable direction

Multi-axis, multi-gear, mechanical connection, the accuracy is not easy to guarantee, and the failure rate is high

And the vibrator installation beam is arranged in the upper middle part of the side plate of the screen frame. The concentrated position leads to stress concentration, resulting in poor overall rigidity of the screen frame and uneven force, which directly affects its service life.

The existing "decreasing amplitude vibrating screen" has an elliptical motion trajectory. In terms of structural arrangement, the shaft vibrator is directly installed on the side plate of the screen frame through the shaft cover tube and the bearing race, and its position is arranged between the upper and lower screens. , and placed on the inside of the front and rear ends to support the damping spring device, the screen frame structure is not compact, the rigidity is poor, the bearing installation and replacement are difficult, and the number of installations is limited, which is not conducive to the large-scale and multi-layer development of the vibrating screen

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