Knowledge

Tufted carpet loom is a widely used main carpet weaving equipment, and the spindle system is its core system. The weaving quality of carpets mainly depends on the smoothness and dynamics of the spindle system of the tufted carpet weaving machine. The vibration of the spindle system can cause the carpet surface to be uneven, the pile height is not in place, and even the looping action of the needle hook can be out of tune or the carpet surface has no pile loops, resulting in waste products.

The spindle system of the tufted carpet loom is generally driven by motors at both ends, and the length-diameter ratio of the spindle can reach 150. Multiple sets of linkage mechanisms are used as the actuators to drive the tufting needles to pierce the base fabric with the yarn. The tension of the yarn and the yarn changes during the tufting movement, and the spindle system drives the needle row to carry the yarn to make a reciprocating puncture movement on the base fabric with a certain tension. Such a spindle system is actually a slender shaft-multi-link complex system with multi-point alternating loads, and it is a time-varying system, and its dynamics are worthy of further study.

professor of Donghua University analyzed the influence of the main shaft system type on the working quality of the loom, and analyzed the position synchronization problem of the multi-group needle multi-link mechanism from the perspective of the phase angle distribution of the crank on the main shaft and the clearance at the hinge. And the synchronous position change data is obtained through simulation, and finally it is concluded that the position height error of the tufting needle linkage mechanism caused by the two can not be ignored. Taking the spindle system of the 4m wide tufted carpet loom as the research object, the mathematical model of several sets of link mechanisms is established, and the theoretical solution method of the complete dynamic balance of the mechanism is proposed . The minimum change is the optimization objective, and a decoupling optimization solution method of local dynamic balance is proposed. The theoretical solution and the optimized solution are compared and analyzed, and it is proved that the optimized local dynamic balance can reduce the vibration of the shaft system and is more conducive to the realization of the mechanism design. .

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