Study On Rectangular Tube End Carriage Of Overhead Crane

Overhead travelling crane plays an irreplaceable role in material handling industry.It is widely used in workshop and sale volume is very high each year.As design and manufacture technology is improving day by day,many crane manufactures put many effort to develop product,which is more reliable,cheaper and easier for maintenance.But end carriage does not have very big involution,many crane manufacture still use box girder section to produce end carriage.But manufacture process of box girder is very complicated and welding requirement is high,it keeps production cost of end carriage high,and breeds accident risk.Main purpose of this thesis is to optimize production process and reduce welding seam quantity and length by introducing rectangular tube into end carriage design,meanwhile reduce production cost and improve reliability.Following content will be researched:Firstly,build theoretical force model for end carriage by comparing with bridge frame.Through phenomenon of rectangular tube is widely used in construction industry,analysis rectangular tube production process and profile property.Then calculate stress for rectangular end carriage by using theoretical formula.Secondly,use ANSYS as a FEA tool,build solid model in ANSYS and shell it before calculation,then find out weak area in rectangular end carriage by stress cloud map.Next step is optimizing weak area by several different means and conclude final solution for optimization.ANSYS result also provides reference for strain gauge arrangement in static test.Last,verify real stress level and position by real test.It can be clearly seen difference between ANSYS software and real static test,and summarize ANSYS validity for other end carriage type calculation,meanwhile approve fatigue lifetime by endurance test.