Study On Mechanism Principle Design And Optimum Working Stroke Of Double Cavity Jaw Crusher

In China,iron ore as an important strategic resource,is very important,provides an important guarantee for the development of national economy.In the beneficiation production,the crushing process has a great impact on the mineral quality,so the crusher as the main mechanical equipment has become an indispensable factor of production.Jaw crusher has the advantages of simple structure and convenient maintenance,which has been widely used in ore processing and crushing engineering.However,the low production capacity of jaw crusher still exists.Therefore,a new type of double cavity jaw crusher with higher production capacity is proposed in this paper.In this paper,in order to solve the jaw crusher of idle motion and low energy density of the input is insufficient,come up with an idea for a new structure of jaw crusher: set up the double cavity structure,do not set the flywheel and pulley structure,directly driven by hydraulic motor,eccentric driving rod drive wheel rolling on the idler pulley groove,moving under the reciprocating roller of roller swinging upper jaw,due to the lower jaw at the same time,the restraint of rocker,thus produce complex planar motion.By using the Motion plugin in SolidWorks software to carry out motion simulation and trajectory analysis,the motion trajectory law of the moving jaw is obtained: the closer the moving jaw plate is to the feeding end,the larger the radius of curvature of the motion trajectory is,and the smaller the radius of curvature of the motion trajectory close to the discharge port is.This crushing method is more efficient,more energy saving,but also conducive to prolong the life of the crusher.Based on the flow characteristics of single particle material,the structure parameters and working parameters of the crushing chamber are calculated.The analysis of the factors affecting the crushing force shows that the compression ratio of the material under pressure is the main factor determining the crushing force when the types of crushing minerals are determined.Combining with the process of particle size change of the ore in the crushing chamber,the mathematical model of crushing force distribution and the curve of crushing force change with the rotation Angle of the moving jaw at different crushing heights were obtained.By analyzing the distribution of crushing force,it is found that the crushing force at the upper end of the tooth plate close to the jaw is greater.The discharge of the ore will go through the compaction stage and crushing stage to avoid excessive consolidation of the ore.By analyzing the relationship between the rotation Angle of the moving jaw and the total crushing force,the maximum crushing force is obtained and the optimal travel of the moving jaw is determined as S =61.42 mm.Using SolidWorks software,build 3D model of parts and assembly structure model.Using ABAQUS software to carry out finite element analysis on the main parts of the crusher,including tooth plate,moving jaw and connecting rod,the stress and strain neograms of these parts are obtained.Through static analysis,the following results are obtained:The maximum stress of the movable jaw tooth plate is 297.4MPa,the maximum stress of the movable jaw is 193.6MPa,and the maximum stress of the connecting rod is273.3MPa,all of which meet the requirements of strength and small deformation,and meet the requirements of structural design.