Vibration analysis of parallel beating up mechanism box of double rapier loom for spacer fabric
Aiming at the problem that the parallel beating up mechanism box of double rapier loom with conjugate cam and four-bar linkage generates strong vibration with the increase of loom speed,which destroys the accuracy and reliability of beating up,the dynamic stress and vibration characteristics of the beating up mechanism and box are studied by combining theoretical analysis with virtual simulation.The dynamic static analysis equation of parallel beating up mechanism is established,and the multi-body dynamics simulation of the mechanism is carried out using ADAMS software to solve the reaction force on the box.The system model of box-spring damping-flexible foundation is built,the forced vibration of box in vertical direction is analyzed,and the method to reduce the vibration of box is explored in the simulation process.The results show that the peak value of the reaction force on the box body at the shaft hole of the swing arm is the largest,and the force on the box body is the most concentrated during the beating up and pushing process.When the cam shaft rotates at 260 r/min,the gear meshing frequency is equal to the first order natural frequency of the box,which will produce resonance.The speed should be avoided during operation.The box produces periodic vibration in the vertical direction.Increasing the number of bolts and adding dynamic shock absorbers will help to improve the vibration characteristics of the box,the amplitude decrease by 38％and 23％,respectively.
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