Determination of installation sites for anti-adhesive devices on the bucket of an EK-18 excavator

9th International Multidisciplinary Scientific and Research Conference "Modern Issues in Science and Technology" Workshop "Advanced Technologies in Aerospace, Mechanical and Automation Engineering"

自然科学;工业技术

Zenkov, S.A.^1

Bratsk State University, Makarenko St. 40, Bratsk

665709, Russia^1

关键词: Actuators locations;    Front resistances;    Geometrical modeling;    Installation site;    Model preparation;    Rigid body models;    Stressed-strained state;    Tetrahedral grids;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/450/3/032015/pdf
DOI  :  10.1088/1757-899X/450/3/032015

来源: IOP

【 摘 要 】

3D rigid-body model of a bucket of power shovel EK-18 was built using modern CAD-software. A tetrahedral grid with 10-node second-order elements was chosen, and the given model was imported to APM WinMachine - model preparation preprocessor for finite element analysis. A finite element model was based on the geometrical model, imported from KOMPAS-3D to APM Studio. Calculation of stressed-strained state of the bucket was carried out under the forces emerging while digging with "back hoe" equipment. Shift, deformation and tension charts were planned and the most and the least strained areas were pointed out. Wet coherent soil excavation deals with soil adhesion to working bodies of power shovels and leads to reduced performance. Performance decrease is caused by reduction of useful bucket capacity and partial unloading, increased front resistance to cutting (digging) caused by wet soil adhesion to a working body, increased bucket entry resistance, increased idle time caused by necessity to clean working bodies. Also energy losses increase and quality of work drops because friction forces go up. Friction force while digging and levelling account for 30...70 percent of total digging resistance while performance decreases 1.2...2 times and more. However, the question of actuators location on the excavator bucket needs to be dealt with. The most suitable spots for mounting devices for reducing soil adhesion to the excavator bucket were defined. Such devices eliminates soil adhesion to bucket and increases efficiency of using power shovels with wet coherent soils.