Efficient double-layer multistage vibrating screen

Abstract

The invention discloses an efficient double-layer multistage vibrating screen which comprises a base, a rack, an upper-layer fixed screen box, an upper-layer floating screen box, a lower-layer fixed screen box, a lower-layer floating screen box and a vibration excitation movement device. The upper-layer floating screen box and the lower-layer floating screen box are suspended and mounted on the rack through multiple upper-layer elastic suspension rods and lower-layer elastic suspension rods which are symmetrically arranged left and right, and flexible screens are connected between two adjacent screen supporting frames of the upper-layer fixed screen box and the upper-layer floating screen box and two adjacent screen supporting frames of the lower-layer fixed screen box and the lower-layer floating screen box. The vibration excitation movement device comprises an eccentric vibration excitation shaft, a driving vibration exciter, a driven vibration exciter, spring guide devices, a fixing frame, an up-down limiting guide sliding mechanism, an upper-layer transmission rod, a lower-layer transmission rod and a steering rod. According to the efficient double-layer multistage vibrating screen, on the premise that material particles can be better, rapidly and comprehensively screened in a layered manner, dry type efficient screening of materials large in viscosity and difficult to screen can be achieved, the fine particle material screening probability is increased, and the efficient double-layer multistage vibrating screen is particularly suitable for raw coal grading screening in the coal dressing process.

Description

technical field [0001] The invention relates to a vibrating sieve, in particular to a high-efficiency double-layer multi-stage vibrating sieve suitable for dry screening of coal with a relatively complex particle size composition, and belongs to the technical field of vibrating sieves. Background technique [0002] Coal preparation is a processing process that uses the difference in density or surface properties between coal and other minerals to remove non-coal substances in raw coal, and divides coal into products of different qualities and specifications according to the needs according to the particle size of the coal. Coal preparation can improve coal quality, reduce the amount of smoke and dust in coal combustion, and is beneficial to environmental protection. [0003] Coal preparation is usually to classify and screen the raw coal first, and then remove the non-coal substances in the raw coal by gravity coal preparation or flotation coal preparation. Efficient classif...

AI Technical Summary

Problems solved by technology

Raw coal classification and screening is usually carried out by vibrating screen. At present, the main problem of vibrating screen is that the screening performance is not strong and the screening efficiency is low. Therefore, improving the screening efficiency and increasing the processing capacity have always been the focus of vibrating screening. Target

[0004] The traditional way to improve the screening performance of the vibrating screen is to increase the size of the vibrating screen (increase the screening area) and increase the vibration intensity (increase the screening speed). This traditional method will inevitably cause vibration. Structural strength, fatigue life and reliability of the screen

In addition, the existing raw coal vibrating screens mostly use single-layer screening. When the particle size is relatively complex, the efficiency of single-layer screening is not ideal. The fine particles are affected by the hindered particles and cannot be completely sieved. Single-stage sieving reduces the chance of fine particles passing through the sieve with complex particle sizes, and the sieving performance is low, which cannot meet the requirements of use.

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