Improvement of draw frame cleaning system
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With the continuous improvement of the quality of spinning yarn, the requirements for the cleaning and suction device of the draw frame are also constantly increasing. If it is slightly improper, it is easy to bring short lint and impurities into the sliver and cause yarn defects. This issue of “Frontline Communication” will introduce the experience of enterprises in using and transforming cleaning systems in practice, hoping to provide reference for enterprises encountering the same problems.
Method 1: Improve the cleaner
Enhanced cleaning effect
Due to the long running time of the A272F draw frame, there are problems such as small swing range of the upper and lower cleaners, poor rotation of the pile sleeves, and poor cleaning effect during the operation. At the same time, this is also an important reason for high yarn defects. .
The traditional solution is to install a tension spring on the upper cleaning comb rack. Although the cleaning effect is enhanced, there are still other problems. If a tension spring is installed, the cleaned velvet flowers will accumulate between the cleaning comb and the tension spring, which is not conducive to being sucked away by the suction air and increases the workload of the operator. Due to the influence of the additional tension spring tension, the eccentric wheel, eccentric swing rod, swing arm, shift fork and other swing components accelerate wear, shorten the maintenance cycle, and increase the material consumption of the machine.
To this end, we have made the following improvements to the cleaner. First, change the eccentricity of the eccentric wheel from the original 5 mm to 7 mm; then, add an oil groove on the working circumference of the eccentric wheel to enhance the mechanical lubrication; finally, increase the thickness of the eccentric wheel by 0.1 mm. Leave appropriate clearance between the outer retaining ring and the eccentric swing rod to ensure good operation, and remove the additional tension spring.
After the above improvements, it has been proved by more than half a year of operation that the swing amplitude of the upper and lower cleaners has been significantly increased, no flowers are accumulated or pinched, yarn defects have been significantly reduced, and the service life of machine parts has been significantly extended, which can not only improve the quality of the yarn , and can save machine material consumption. The cost of this improvement is low and the results are obvious. (Chen Qian of Jiangsu Zhongheng Group)
Method 2: Sharpen the cleaning comb
Reduce yarn defects
The draw frames used by our company include FA272, FA302, FA306 and FA306A. For cleaning, a rotating velvet belt is used to wipe the upper roller. The fibers on the velvet belt are collected by the cleaning comb and then sucked into the cotton box through the upper suction port. After long-term operation, the velvet belt ages and relaxes, and the cleaning and combing needles are severely worn. As a result, the fibers on the velvet belt cannot be combed out normally, resulting in a large number of yarn defects, which affects the normal drafting of cotton fibers in the roving process and makes spinning difficult. The difficulty increases, resulting in a decrease in the quality of semi-finished products.
In response to this phenomenon, we began to adopt the cleaning comb tension spring method, which temporarily worked. However, over time, since the spring is always under stress, the swing bar and the swing bar shaft will work hard, causing excessive wear and increasing the investment in machine parts, so this method is not advisable.
Later, we replaced the cleaning comb with a new one, but after a short time, it became the same as before. Adjusting the angle of the cleaning comb did not work. After careful observation, it was found that the sharpness of the cleaning comb needle was smooth, the needle tip was convex, and it did not penetrate the flannel cloth enough. So we processed the cleaning comb. First, we took off the cleaning comb to flatten the area where it contacts the velvet belt, and sharpened the comb needle with sandpaper. Then, adjust the comb needle to the machine until the angle between the cleaning comb and the velvet belt is about 15 degrees.
By using the above adjustments, not only the fibers on the velvet belt are combed and cleaned, but also the dust attached to the velvet belt is cleaned, which greatly reduces yarn defects and ensures the quality of semi-finished products. ■Zhang Long of Shandong Huaxing Fabric Group Co., Ltd.
Method 3: Adjust the cleaning system
The dry CV value decreases
Our company purchased more than a dozen Truetzschler HSR-1000 draw frames in June 2006. During production and operation, some machines often had sliver adsorption onto the upper coiler, or slivers. The surrounding fibers are sucked into the gap between the coiler and the upper panel, resulting in tops, resulting in fiber hooks in the spun raw sliver, sliver adhesion, increased CV value of the sliver, and high roving breakage rate, which seriously affects the quality of the sliver. Post-process production and yarn quality.
Initially, it was believed that the following causes were caused: excessive cotton wax or burrs in the inclined tube of the coiler, causing the channel to be incomplete; improper control of temperature and humidity to generate static electricity; damage or improper tension of the coiler transmission gear belt; Clean the negative pressure system, imbalance of the complementary proportion of old and new air, etc.
After checking and repairing the above reasons one by one, the results were not satisfactory. Later, after long-term analysis and research, it was found that the problem was caused by a cleaning system suction tube on the side of the strip coiler. When the cleaning fan is started, the suction tube will suck away the flying flowers and dust inside the coiler at any time. At the same time, a negative pressure is generated in the gap between the upper coiler and the panel, causing the sliver to adsorb to the sliver coiler and the fibers at the edge of the sliver to be sucked in.
Specific method of modification: remove the cleaning straw of the coiler, seal the suction port with tape, and clean the inside of the cleaner once a week. After the modification, this phenomenon no longer occurs, the quality of the sliver is greatly improved, and the sliver is dry. The CV value is reduced, neps and other indicators are guaranteed, and the labor intensity of workers is also greatly reduced. (Liu Yun and Zhang Xuemei of Dongying Hongyuan Fabric Co., Ltd.)
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