Dynamic stress analysis of four-bar linkage beating-up mechanism on loom wallboard

The loom wallboard is characterized by big size and complicated structure,and the back and forth swinging operations of the four-bar linkage beating-up mechanisms make it withstand a great impact load from which originates the major vibration of the loom.Therefore,this paper established corresponding kinematics equations and dynamics equations for the supporting forces borne by crankshaft hole and rockshaft hole of the loom wallboard.The computation of the bearing stress of the two fixed holes at relative positions indicated the bearing stress had varied values and directions at different rotating angles of the shaft;and the impact load against the wallboard varied with the installation angle of the two holes.The total maximum supporting force value could be computed when the angle of beating-up is fixed.When designing the positions of the holes,the minimum value should be taken so as to gain lower vibration and longer working life.