When the licker-in roll rotates the serrations to drive the surrounding air, due to friction and adhesion between the air molecules in the air driven by the formation of the air layer around the licker-in layer, the outer layer of the resulting air is called boundary layer airflow floor. 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. 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. The thickness of the boundary layer increases with the length of the boundary layer.
The boundary laminar flow velocity at the contact surface and the surface velocity of a licker-in is almost equal to the velocity of the lower layer. The basic situation of the air velocity distribution in the licker-in part of the carding machine is shown in Figure 2-15. The distance point between the feeding board and the licker-in is the start of the licker-in to drive the boundary layer.
Due to the formation and thickening of the surface layer ③ between the feeding board and the dust-removing knife, the air in the car belly is replenished from the bottom of the quilt, forming an airflow ①, and the airflow ① supports the fibers on the licker-in, and Carry short fibers and dust under the licker-in and floating. The separation of the boundary layer at the dust removal knife reaches the thickest. Due to the small distance between the system dust removal knife and the licker-in, most of the air flow studied is blocked by the dust removal knife, and develops down the back of the knife to form different air flows ②, which float on the surface of the licker-in. Short fibers, dust and impurities in the surface layer fall to the belly of the car with the airflow ②. By increasing the air agitation of the dust removal knife, it gradually thickens in the second drop zone, and the air in the belly of the car is replenished from the front of the dust removal knife to form an air flow ④, which promotes the airflow on the back of the knife ② Some students flow back through the bottom of the knife along the front of the knife , part of the main fibers can be effectively recovered.
The air flow from the boundary layer ⑤ to the population of the small leak bottom, most of the enterprises enter the small leak bottom, and the thickness exceeds the air flow outside the small leak bottom inlet gap, which will break the belly of the car. The influence of the airflow entering the small leak bottom is gradually reduced with the gradual reduction of the gap, and the air flow needs to be discharged from the dust bar and the mesh structure. The airflow ⑦ at the outlet of the small leak bottom merges with the airflow ⑧ driven by Xinjinlong, and after strengthening the distance point of the Xinjinlong licker-in roller, it is forgotten to be divided into the following two parts.
Air ⑩ enters the back cover plate, and air ⑨ enters the licker-in cover to the vicinity of the feeding roller company, and is discharged from the thorn-bar vacuum hood.