Design And Simulation Of 50 Type High Frequency Knapper

High frequency knapper is a new and efficient excavator accessory tool developed in recent years,it is a kind of new type of excavator accessories which is driven by hydraulic motor to generate destructive force by using centrifugal force and reciprocating motion.Compared with the traditional hydraulic crushing hammer,it has the advantages of high crushing efficiency,low construction noise and low fuel consumption,especially suitable for fractured rock which Mohs hardness of less than 7.At present,high frequency knapper is still in the development and trial stage,there are problems such as weak crushing ability and failure of key components.Taking the 30-type high-frequency knapper for research objection,which is developed by Guizhou Hongfeng Zhongzhi Engineering Machinery Co.,Ltd.,a 50-type high-frequency knapper with higher crushing efficiency was designed in this paper.Based on this model,the dynamic software is used to simulate the movement condition under the real working condition,and the reason of its poor crushing ability is found out.Then,the finite element software is used to analyze the force of the key components of the high frequency knapper,and through the actual verification,it solved the problem of the key components easy to damage.The main work are as follows:1?The principle and structure of the high frequency knapper are studied,based on the manufacturer's 30 type high frequency knapper,a 50 type high frequency knapper is designed,a detailed design and verification for the key components of high frequency knapper such as eccentric block,helical gear,vibration box,the working conditions of the high frequency knapper are analyzed,and the hydraulic motors and excavators are selected based on this.2?The theoretical mathematical model of high frequency knapper is established,and the model is simplified,the theoretical simplification model of high frequency knapper is simulated by MATLAB software,clarify the working process,working principle and the relationship between the frequency and the strike force,and provide the theoretical basis for improving the crushing ability of the high frequency knapper.And then use the dynamic analysis software ADAMS to simulate the three-dimensional model,so that the simulation results and theoretical mathematical model results are compared,the correctness of the two models is verified and the stress of the key components is obtained,which provides the boundary condition for the finite element analysis.3?The finite element model of the 50 type high frequency breaker is established,and the key components of the vibration box and the helical gear are analyzed statistically,the stress and strain of the two components are analyzed,and it is found that the dimensions of the two key components are in accordance with the requirements,but there are local stress concentration,then the two key components were improved locally,reducing the stress concentration of the key components.Then the modal analysis of the whole prototype of the high frequency knapper is carried out to find out the natural frequency and the corresponding deformation in the working state,so as to avoid the resonance frequency of the hydraulic motor.4?After put the 50 type high frequency knapper into the actual verification,found that the spindle bearing become the most vulnerable key component.Therefore,carried out rough analysis,microscopic deformation measurement etc.for the spherical roller bearings from the bearing force,the installation of the bearing and the bearing lubrication.Finally,the main reason for the failure of the bearing is due to poor bearing lubrication caused,and the bearing seat was improved to improve the bearing lubrication,improved the service life of high frequency knapper.