Multi-stage screening mechanism and concrete gravel screening device

Abstract

The invention discloses a multi-stage screening mechanism for screening in a spatial position sequence. A primary screening device and a secondary screening device are sequentially arranged from top to bottom, a first driving motor is used for driving a swing mechanism to swing, and then an arc screen is driven to swing; materials screened by the arc screen can fall into the secondary screening device; an output shaft of a second driving motor is connected with the top of a connecting rod, and the bottom of the connecting rod extends downwards; a sleeve is arranged on the periphery of the connecting rod, and a gap exists between the sleeve and the connecting rod; a downward moving pressing piece can drive a movable block to slide downwards so that the other end of a second connecting rod can extend out of a through groove; a secondary screen is connected to the sleeve; the secondary screen comprises a bottom screen and a side screen, and the bottom screen and the side screen define a screen structure with an opening in the top and the periphery and the bottom connected; and the secondary screen can rotate relative to a chassis. The invention further discloses a concrete gravel screening device. The multi-stage screening mechanism and the concrete gravel screening device have the advantage of being high in screening efficiency.

Description

technical field [0001] The invention relates to the technical field of construction engineering material processing, in particular to a multi-stage screening mechanism and a concrete sand screening device. Background technique [0002] The material screening technology is to realize the separation between the material with larger particle size and the material with smaller particle size through the filtering function of the mesh in the screen. When it is necessary to classify the particle size of the material or to screen the material multiple times to ensure the quality of the screening, a multi-stage screening mechanism is required. [0003] For example, patent application 201711362216.2 discloses a multi-stage screening system for organic fertilizers. The first screening unit screens debris, the second screening unit screens out a particle size range and the third screening unit screens Particles in another particle size range are separated; multi-stage screening is carr...

AI Technical Summary

Problems solved by technology

However, when the above-mentioned prior art screens materials, as disclosed in patent application 201711362216.2, it discloses a multi-stage screening system for organic fertilizers, which uses cam drive and spring reset to realize the shaking of the hopper. This contact transmission method In order to ensure the accuracy of the transmission and prevent excessive rebound impact force, the range of motion should not be too large, resulting in limited motion range of the screen and low screening efficiency; such as the agricultural three-stage vibrating screen disclosed in patent application 201721736026.8 or patent application 201721885664.6 A disclosed sieving device in the production process of florfenicol powder adopts the linear reciprocating motion of the sieve for sieving. The structure of the sieve plate of this technology is mostly a planar structure, that is, there are mostly meshes that conduct up and down. Holes, combined with the vibration-type or swing-type reciprocating linear motion of the prior art, lead to the fact that when the material is sieved, its discharge points are mostly concentrated at the bottom of the screen, and the space utilization rate of the sieve is low; it also leads to Low sieving efficiency technical problems

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