Conveying Mechanical Analysis And Experiment Of Vertical Upgrading Of Screw Unloader

With the rapid development of the world shipping in bulk, as good continuousbulk unloader machine screw ship unloader is to the broad masses of the port’s favorwith the comprehensive advantages of its environmental protection and energyconservation. Study on the vertical conveying mechanism of screw ship unloader is akey problem in the field, and is highly payed attention to by the related scholars. Inthis paper, the vertical transport of screw ship unloader is the object, the verticalconveying mechanism are studied thoroughly with the simulation method, the modeltheory of granular material mechanics, contact mechanics analysis method of theoryof discrete element and Test method for prototype. The main work and innovationsof the research are as follows:1. Applying discrete mechanics, continuum mechanics and particle swarmtheory, establishing the granular mechanics model of vertical screw ship unloadermaterial particles in steady motion, innovatively making hypothesis of change onspeed of material particles spiral groove along the radial. Through the analysis ofmaterial motion, the motion parameters of materials are established. Researchdetermines the type of the free surface longitudinal section material anddiscrimination of conveyor,solving method and distribution of surface pressurecaused by material particles on the pipe wall spiral, establishing the calculationmodel of productivity and spiral movement characteristic parameter, material shaftdriving power and giving the numerical calculation method. Analysis of modelapplication of vertical conveying mechanism, variation law of conveyor designparameters and performance parameters were described, providing scientific theoryto support for the main parameters of vertical screw conveyor.2. With application of discrete element theory and EDEM software, the verticalscrew related physical parameters of material, the material conveying process, thematerial in the feeding process and the movement process of conveyor bottom in therolling interval type middle support is getting system simulation. Material analysis ofdiscrete element simulation is done to different filling ratio and different speed of thescrew down vertical screw at the bottom of the vertical transport and motion process in the middle support, getting the changing characteristics of performance and thechanging relation between ability of vertical screw conveyor feeder for feedingcapacity and the rotation speed of material collection screw, verifying the possibilityof passing through the rolling interval middle support, and design guidelines aregiven to the rolling interval intermediate support.3. Taking L type screw unloader and vertical conveyor as an experimentalresearch platform, the experimental study was carried out on the screw ship unloadervertical conveying mechanism and related material reclaiming process, thepossibility of passing through intermediate support. Developing the screw shipunloader vertical conveying and feeding mechanism test-bed, the test scheme ofrelevant performance test is done; The conveyor feeding ability, and filling rateperformance parameters, variation of transmission capacity, material performanceparameters with the feeding screw speed and stockpile relation highly wasinvestigated, verifying the consistency of material passing through the middle of thesupport both in the theoretical model and the simulation model. Experimental resultsreveal the law about conveyor feed port limit of feed rate, obtain the relevant changecurves of vertical transport and reclaiming process, verify the correctness of thetheoretical model of the limitations of the accuracy of simulation models.This paper suggests research methods and conclusions about conveyingmechanism of screw ship unloader, providing the theory support and the designcriteria for developing the new screw ship unloader, providing a new idea for thestudy of spiral transport different characteristic of the granular material.