A high-efficiency double-layer multi-stage vibrating screen

Abstract

The invention discloses a high-efficiency double-layer multi-stage vibrating screen, which comprises a base, a frame, an upper fixed screen box, an upper floating screen box, a lower fixed screen box, a lower floating screen box and an exciting motion device; the upper floating screen box and The lower floating screen box is suspended and installed on the frame by a plurality of symmetrically arranged upper elastic suspension rods and lower elastic suspension rods respectively. The upper fixed screen box, upper floating screen box, lower fixed screen box and lower floating screen box are adjacent A flexible screen is connected between the two screen support frames; the vibration excitation device includes an eccentric excitation shaft, an active vibration exciter, a driven vibration exciter, a spring guide, a fixed frame, an upper and lower limit guide sliding mechanism, Upper drive rod, lower drive rod and steering rod. The invention can realize dry efficient screening of difficult-to-sieve materials with high viscosity and improve the probability of fine particle materials to be screened under the premise of better, rapid and comprehensive layered screening of material particles, and is especially suitable for the coal preparation process Raw coal classification and screening.

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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