Structural Improvement And Life Extension Analysis Of Vibration Dispenser Of Ship Unloader

Tangshan Caofeidian Industrial Port Co.,Ltd.Phase I of the ore terminal bridge unloader has been put into production in 2005 and has been used for more than 10 years.Due to the limited shock absorbing capacity of existing feeder buffers,it is not sufficient to effectively absorb feeders.The vibration energy in the vertical direction during operation causes a large vertical alternating force to act on the steel structure,resulting in resonance of the device.Therefore,it is of great significance to study how to reduce the resonance effect caused by the vibration of the feeder and to the overall service life of the bridge grab ship unloader.In this paper,the ship's 2500t/h grab ship unloader is taken as the research object.Through theoretical calculations and experimental analysis,it is determined that the shock absorber buffer device is converted into a double buffer device,and the fatigue life and feed efficiency of the ship unloader before and after the transformation are determined.And economic benefits were studied.Using the nominal stress design method,the P-S-N life curve of the component was calculated by taking into account the geometric dimensions of the metal structure of the ship unloader,the shape of the component,and the effect of the surface machining state.The life curve of the component P-S-N was given.Based on the finite element analysis software of ANSYS,the finite element analysis model of metal structure of ship unloader was established.The structure of the ship unloader before and after the transformation was studied under four working conditions by finite element analysis.The different conditions of ship unloader were given.The distribution of the stress field was shown below,and the maximum stress before and after the transformation was compared and analyzed;according to the maximum stress difference,the location of the stress measurement test point for the metal structure of the ship unloader was determined.In a similar environment,a stress test experiment was performed on each measurement point,and the stress time history data obtained from the test was processed by the Sanfenggu Rainflow Counting Method.The stress spectrum at each measurement point was compiled,ie,the frequency histogram of amplitude.According to the frequency histogram of each measuring point,the total damage degree and remaining fatigue life of each measuring point were calculated using Miner fatigue cumulative damage principle;residual fatigue life,feeding efficiency and economic benefit before and after unloader revamping respectively A comparative analysis was carried out and the results showed that the remaining fatigue life,feeding efficiency.