A necessary condition for carding is that the cotton roller and the cotton board have sufficient grip on the cotton layer. 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. Special equipment for the textile industry on the winder.
As the last process of spinning and the first process of weaving, winding is the link between the past and the next.“bridge”Therefore, it occupies an important position in the textile field. Grinder A spinning machine that turns fiber strands into rovings. The main function is to draft and twist, and to wind the roving into a certain package to meet the processing requirements of the spinning frame.
To increase the grip, the method of increasing the pressure of the cotton roller is often used. The pressure on the drum is insufficient, and the sawtooth is used before the cotton whiskers are completely combed, which affects the quality of the strip, and in severe cases, a large number of cloud spots will appear. However, the high pressure increases mechanical wear, resulting in the deformation of the cotton roller, and the low center pressure weakens the lifting force of the cotton layer in the middle of the Laura.
Different diameters have different stiffness (the degree of elastic change under external load), and under the same pressure, the deflection (bending) of each point of the working part of Laura is also different. The deflection test was carried out on cotton feed rollers with diameters of 70mm and 75mm; when the pressure was 400kg, the maximum deflection of the two types of Grommets measured with the plug was 0.94mm and 0.48mm, respectively, the former was almost twice the latter. A cotton roll with a diameter of 57 mm was operated under the above pressure, and the quality of the cotton web has been found to deteriorate.
Therefore, the pressure on cotton rollers of this diameter is usually limited to 200-350 kg. The diameter of the cotton roller of an A186 carding machine is 70 mm, and the general use pressure is 380-540 kg (including the weight of the cotton roller). The clamping force between the feeding roller and the feeding plate (outlet) was tested, the fibers were pulled near the outlet of the feeding plate with a spring balance, and the clamping force at each point on the width of the feeding layer was measured, as shown in Figure 2- 10 shown.
Due to the large pressure at both ends of the idler, the two ends of the idler are deformed, the clamping force is large, and the middle clamping force is small, which is unfavorable for the carding of the licker-in. Therefore, it is necessary to increase the pressure appropriately to ensure that the cotton layer has enough lifting force to facilitate the carding of the cotton without deformation. The magnitude of the clamping force, feeding the plate along the arc, is plotted as shown in Figure 2-11.
It can be seen from the distribution of pressure return that the gripping layer of the feeding roller and the feeding plate is the surface of the cotton, so the clamping action of the cotton lap is more reliable. The lateral distribution of this clamping force is more uniform, and the quality of the work roll stab wound is more favorable.