With the improvement of product quality, the production line of quilt yarn piecing is more and more demanding. The structure of the double twisting unit of the double twisting machine mainly includes the spindle braking device, the spindle part of the double twisting machine, the yarn winding device, and the special device of the double twisting unit. Carding machines are used to process cotton fibers and chemical fibers and belong to textile machinery.
According to the spinning process, carding is an important process. The front process of the carding machine is the opening and cleaning machine, and the latter process is the drawing frame (carding process) or the sliver coiler (combing process). During the spinning process of the spinning frame, the semi-finished roving or sliver is drafted, twisted, and wound into a spinning machine. The combed sliver and the needle-carding machine combine the sliver, the needle row is drafted to improve the sliver structure, and the roving is further spun into spun yarn on the ring spinning frame, which is the main spinning machine.
1980s splicer. In order to improve the yarn quality has played an important role. The quilt production line splicer can be divided into ambient air splicer and friction splicer, which can be untwisted and twisted by using different air or friction analysis methods respectively.
The basic working principle is to untwist the two ends of the yarn knot to prepare a butt, or untwist one end and twist the other end, and then combine the enterprises to twist or twist back, and finally develop the yarn butt. As shown in Figure 1, the air is twisted fan 4 (rod 3), which operates. The weaver lead of the bobbin axis and yarn end is placed in the cross splicer and scissor positions of the gripper.
When switching the core, the fusion splicer starts working. First, the money is lost to the yarn after the yarn is cut by the scissors bit, the splicer automatically opens the forward air valve tube and twists backwards, so that the downward jet is sucked into the untwisting tube after the yarn end is cut off After a certain time of untwisting, the presser foot automatically rotates downward, so that the yarn end is twisted into a groove at the exit of the untwisting tube. The valve then automatically opens the twist hole so that the yarn ends B are applied to swing back together to complete the splicing.
The length of the splicing knot is about 25mm and the knot strength of the yarn is usually 2. The quilt is subjected to production line technology friction twisting 4. It is a friction splicer (Figure 6-4), which is also called a mechanical splicer. The basic working principle of the friction splicer is to clamp the two different yarns on the bobbin and the bobbin in two metal discs, and through the rotation of one disc, the yarn end is untwisted, and then it can be removed. At the end of the structure, the disc is twisted in the opposite direction to make the two yarns completely spliced. image 3.
The strength of the air spliced splice is about 80% lower than the original yarn. It is suitable for splicing of various long and short fiber yarns, with low price and long service life. Downward splicing with high splice strength can reach or exceed the original strength of the yarn, but it is limited to 50 mm length or less spliced spun yarn, high cost, maintenance requirements, and generally 2-3 years of life.
2. Electronic yarn clearing: Advantages: (1) The detector does not damage the fiber and does not shave the yarn (2) High yarn defect removal efficiency, the increased speed is still a satisfactory effect yarn; (3) It can be removed Enterprise flat yarn defect, good elasticity yarn defect; (4) can detect and control the rent and length of yarn defect; (5) remove roving, double yarn, details and other functions. (6), and automatic remote access through computer matching junction tube, which can be used for monitoring and unsightly Hall transmitters. Disadvantages: (1) The structure is complicated, the cost is high, and the maintenance work is difficult; (2) The influence of temperature and temperature change is sensitive.