Multi-stage screening mechanism, concrete sand and gravel screening device

Abstract

The invention discloses a multi-stage screening mechanism for sequential screening in spatial positions. The primary screening device and the secondary screening device are arranged sequentially from top to bottom. The first driving motor is used to drive the swing mechanism to swing, and then drive the circular arc screen. The net swings; the material screened from the arc screen can fall into the secondary screening device; the output shaft of the second drive motor is connected to the top of the connecting rod, and the bottom of the connecting rod extends downward; the sleeve is set on the There is a gap between the periphery of the connecting rod and the connecting rod; moving the lower pressing piece down can drive the movable block to slide down so that the other end of the second connecting rod sticks out of the through groove; the secondary screen is connected to the sleeve; The secondary screen includes a bottom screen and a side screen, and the bottom screen and the side screen are enclosed to form a screen structure with an opening at the top and connections around and at the bottom; the secondary screen can rotate relative to the chassis. The invention also discloses a concrete gravel screening device. The invention has the advantage of high 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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