The spinning frame is an important equipment in the spinning process, and its stable operation is of great significance to the quality of spinning. Relevant personnel from Jiangsu Yueda Textile Group Co., Ltd., Ningbo Mengheng Garment Accessories Co., Ltd., and Jinzhong Jingwei Mechanical and Electrical Equipment Co., Ltd. exchanged experiences on the improvement of spinning machines, hoping to be helpful to production companies.
Method 1: Design a new drive system to improve the degree of automation
The A513 spinning machine adopts a single The motor is driven by an open gear, has a heavy maintenance workload, is not well sealed, and is prone to oil pollution; the lifting and forming cam of the ring plate is easy to wear, generates impact force, and is inconvenient to adjust the process. It can no longer meet the current needs of spinning. Based on the analysis of the advanced spinning frame transmission systems at home and abroad, and combined with the existing multi-axis drive technology, our company’s technical personnel have proposed a set of spinning frame drive system transformation plans with their own characteristics and advantages.
The transformation plan cancels the open gear transmission method. The roller uses an asynchronous motor with an encoder to accurately control the roller speed in a closed loop. At the same time, by sampling the spindle speed in real time, the PLC The front roller motor is controlled by a frequency converter to follow changes in spindle speed.
The control system also uses DC bus technology, that is, in the event of a sudden power outage, the large-capacity main inverter supplies power to the front, middle and rear roller inverters, so that the front, middle and rear rollers follow the inertia of the main motor and synchronize Stop the car to avoid extensive beheading.
Based on preliminary research, Fengwei PLC, Delta PWS6800C HMI, TECO servo motor, and TOYO inverter were used for transformation. First, the drafting gear of the spinning frame and the lifting cam of the ring plate were removed, and the motor was installed on the newly designed steel wall panel for modification practice.
Then process parameters are input to realize multi-axis CNC transmission of traditional spinning machine. After the test operation, the transformed traditional spinning frame has improved automation and flexibility, is easy for operators to operate, and has a low failure rate during the equipment test process.
Method 2: Transform into hollow roller compact spinning yarn with better quality
Our company cooperated with universities and carried out hollow roller compact spinning transformation on the FA1516 spinning frame, and successfully spun JC11.7tex compact yarn, with the quality reaching a high level.
The transformation process of hollow roller compact spinning is as follows: replace the 25 mm diameter front roller with a 50 mm diameter hollow roller. In order to keep the surface linear speed of the modified hollow roller consistent with that of the modified front roller, the angular speed of the front roller needs to be reduced by half, so the pair of transmission gears 50T and 32T on the front roller head of the FA1516 spinning machine are changed to 36T and 46T.
After the front roller of the spinning machine is replaced with a hollow roller with a diameter of 50 mm, the height of the T-shaped lower pin needs to be changed from the original 14 mm to 12 mm. This can effectively improve the Friction phenomenon between the lower rubber ring and the hollow roller. In addition, it is also necessary to change the angle between the front roller seat of the spinning machine and the horizontal plane from 45° to 30°, and adjust the position of the middle and rear rollers to ensure that the spinning planes of the three rollers are in the same plane. At the same time, the installation of the Suesen leaf spring cradle should be adjusted. horn.
We used the modified hollow roller compact spinning device to successfully spin JC11.7tex compact yarn on the FA1516 ring spinning machine, and compared it with traditional ring spinning and Suesen spinning machines. Comparative testing of yarn quality was carried out on mesh circle compact spinning. Practice has shown that the yarn quality after the transformation is significantly higher than that of traditional ring-spun yarn; compared with Suessen grid ring compact spinning, the yarn evenness and yarn defect quality are slightly better, the strong elongation performance is equivalent, and the 3 mm harmful hairiness is slightly lower. Poor, but more hairiness of 1 mm to 2 mm is retained, which is beneficial to improving the cloth style.
Method 3: Enlarge the upper opening of the suction tube to reduce clogging of the holes in the suction tube
The holes of the suction tube of the company’s ring spinning testing machine are very easy to get clogged. Technicians analyzed that the fibers sucked by the holes at both ends of the suction tube have a long journey in the tube lumen, and are easily stuck in the tube lumen and difficult to be discharged when encountering burrs, rust, or resistance between fibers. In addition, this form of tube lumen The air suction is uneven, and the holes at both ends have weak suction and are easily blocked.
Based on the above analysis, an improved cotton suction tube was designed, which mainly expanded the upper mouth of the cotton suction tube to 280 mm, the length to 60 mm, and the diameter of the lower port remained unchanged. The two ends of the upper mouth of the suction tube are located exactly between holes 2 and 3, and holes 6 and 7, which are the places where fibers tend to accumulate. The accumulated fibers directly enter the mouth of the suction tube and are easily discharged.
The upper ends of the original cotton suction nozzle are at the 4 and 5 hole positions, and fibers are prone to accumulate at approximately right angles to the cotton suction nozzle. After the improvement, this problem no longer exists; The shortest horizontal distance from the holes at both ends of 1 and 8 to the cotton suction port has been reduced, more than half of the original one; and the volume of the new cotton suction tube mouth cavity has increased, allowing a large capacity of accumulated fiber, and a long filling time. In addition, the entire combination The suction in the cavity is much more uniform than before, thus reducing clogging. During actual installation, the connecting pipe needs to be shortened accordingly. Experimental observations on the improved cotton suction tube showed that the average number of blockages per hour was less than that of the original cotton suction tube. </p
