Aiming at the lack of theoretical analysis and literature review about shear beam S type weighing sensor

fault analysis and structural optimization are short of rigorous theoretical basis

taking OCX-XZ-10 T type hanging scale as prototype

stress situation of its key structure is systematically analyzed and studied.Firstly

weak position and strength checking method of shear beam S type load cell are defined

and the safety factor is 4.23

which meets the requirement of " the maximum weighing 300 % overload safety factor of electronic Hanging Scale".Secondly

the one-time statically indeterminate force model of the middle beam is established

the analytical expressions of the moment and shear stress distribution on the middle beam are derived.

two conclusions are drawn that existing a region with zero bending moment in the middle beam and the shear stress distribution in the tectonic area is relatively uniform.Finally

the relationship between the principal stress and the shear stress is analyzed; the reason why the strain gauge is attached to the middle of the neutral axis is clarified.The related research results can provide theoretical reference and help for fault analysis and improvement optimization of shear beam S type weighing sensor.