Three-strand direct twisting machine and method for directly twisting three yarns into thread

Abstract

The invention provides a three-strand direct twisting machine and a method for directly twisting three yarns into a thread. The three-strand direct twisting machine comprises a two-strand twisting spindle position and a three-strand twisting spindle position, according to the method, two twisting yarns twisted by the two-strand twisting spindle position are wound n circles on a first overfeeding assembly, then conveyed to an outer yarn long pipe of the three-strand twisting spindle position through a yarn guiding device, then conveyed to a three-strand-twisted twisting assembly to form a three-strand-twisted outer yarn air ring, and twisted with a three-strand-twisted inner yarn into a three-strand-twisted yarn, and the three-strand-twisted yarn is conveyed for finished product package; the size of the three-strand-twisted outer yarn air ring is controlled according to the overfeeding speed of the first overfeeding assembly. The three-strand direct twisting machine and the method for directly twisting the three yarns into the thread overcome the interference of the speed of an overfeeding assembly in the prior art to the shape of the three-strand-twisted outer yarn air ring, so that the stable energy-saving small air ring can be obtained; the twisting yarn conveying speed of the first overfeeding assembly and second overfeeding assembly can be independently adjusted to match the winding speed of the three-stranded-twisted yarn to obtain the ideal package density and improve the quality of the finished product package.

Description

technical field [0001] The invention relates to the field of direct twisting machines, in particular to a three-strand direct twisting machine and a method for directly twisting three strands into a thread. Background technique [0002] The three-strand straight twisting machine is mainly used in the production of tire cord, industrial filter cloth and high-quality carpet and other industries. Chinese patent document CN101429693B discloses a method for directly twisting three-ply yarns into a thread and a twisting device. Two spindles form a station to realize one-time twisting of three-ply yarns. Both spindles are provided with damping torque control storage by electromagnetic tensioners. The wrapping angle of the yarn disc ensures the stability of the balloon, and the overfeeding devices of the two spindles share the drive shaft, and the linear speed of the overfeeding and winding of the two spindles is the same. [0003] It is known from the existing energy-saving techno...

AI Technical Summary

Problems solved by technology

In the process of trying to apply three-ply direct twisting to save energy, because the overfeeding speed of the capstan of the three-ply twisting spindle position is the same as that of the two-ply twisting spindle position, the speed is too fast and cannot be adjusted independently, and a stable small air circle cannot be obtained.

[0004] When the three-strand straight twisting machine is threaded and threaded, the large overfeed roller of the capstan must be started and stopped flexibly. The existing technology uses an electromagnetic clutch to realize the on-off of the transmission. In this device, the friction plate and the electromagnetic armature rely on spring pressure to transmit torque. Relative slippage during the process will cause the friction plate to wear and become thinner, and the gap between the electromagnet and the armature will gradually increase beyond the limit of the suction distance, which will easily cause the large overfeed roller to fail to brake

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