Compact spinning shifting device improves quality
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The technical principle of compact spinning is actually to gather the fibers output from the front roller. Therefore, the selection and optimization of drafting and gathering system components are the key to achieving better results in compact spinning.
Compact spinning yarn has the characteristics of high strength and low hairiness. Its technical principle is actually to gather the fibers output by the front roller. Therefore, the selection and optimization of drafting and gathering system components are crucial to whether compact spinning can obtain better results. The key to good results. Recently, at the “Five Loves·Golden Cat Cup” China Spinning Yarn Quality and New Product Development Technology Forum, Rizhao Yuhua Machinery Co., Ltd. and Xinye Fabric Co., Ltd. conducted a detailed discussion on how compact spinning technology can improve the quality of spinning yarns. Elaborate.
At present, domestic compact spinning technology has become increasingly mature. Four-roller negative pressure compact spinning has won the trust of the market and users with its advantages of stable spinning quality, wide spinning range, less consumables, and low energy consumption. In order to adapt to the requirements of different spinning yarn varieties for compact spinning products, it is necessary to continuously optimize and select parts and equipment, and continuously improve the structure and performance of compact spinning products, thereby improving the quality of compact spinning yarns.
The technical principle of compact spinning is actually to gather the fibers output from the front roller. Therefore, the selection and optimization of drafting and gathering system components are the key to achieving better results in compact spinning.
The quality of the cots used in compact spinning has a great influence on the evenness, yarn defects, single yarn strength and end breakage of the yarn. Choosing cots with low hardness and good elasticity can better achieve the elastic grip of the fiber. , improve the evenness of spinning yarn. According to the application of Yuhua Company’s compact spinning products in different yarn mills, it is better to choose Shore A65 degree cots for spinning pure cotton varieties, while cots for compact spinning yarns made of chemical fiber raw materials are better. The hardness needs to be increased to about 70 to 75 degrees.
Compact spinning yarn has the characteristics of high strength and low hairiness. The structure and principle of compact spinning determines that the traverse range of the spinning yarn is smaller than that of ordinary ring spinning, while Siro compact spinning directly eliminates the need for spinning. The yarn traverses. Experimental results show that the traverse motion of the spinning yarn has a great impact on the hairiness, neps, thick details, etc. of the yarn, and is an important factor causing the instability of the spinning yarn indicators. The reduction or absence of the traverse range will accelerate the wear of the rubber roller, shorten the grinding cycle of the rubber roller, reduce its service life, and increase the cost of consumables.
In order to solve the problem of shortened rubber roller life, Rizhao Yuhua Company has developed a compact spinning displacement spinning device, which places the negative pressure tube in the four-roller compact spinning gathering device or the three-roller compact spinning gathering device The air suction slot is shifted 1mm to 10mm to the left or right from the original spinning position, so that the drafting part deviates from the center of the front rubber roller by 1mm to 10mm. At the same time, a roving limiter is added between the rear rubber roller, the rear roller, the middle iron roller, and the middle roller. There is a limit groove on the roving limiter. The width of the limit groove is 1mm to 5mm. The center of the limit groove is relative to The original spinning position is shifted 1mm to 10mm to the left or right, and the offset amount and direction are consistent with the suction slot on the negative pressure tube, so that the yarn retains the 3mm to 4mm traverse of compact spinning. During use, mark one of the end caps of the rubber roller. After one cycle of operation, change the directions of the rear rubber roller, front rubber roller, anti-twist rubber roller, and grid circle, thereby changing the direction of the yarn on the rear rubber roller, The positions on the front rubber roller, anti-twist rubber roller and mesh ring can be used for another cycle, thereby extending the service life of the rear rubber roller, front rubber roller, anti-twist rubber roller and mesh ring, and ensuring the yarn formation Stability of quality.
Compact spinning products place higher requirements on the quality of front rollers and small rollers. In addition to the requirements for the strength of the rollers, the requirements for surface roughness and dimensional accuracy of the rollers are more stringent than those for general ring spinning. The surface of the roller before compact spinning is more likely to have flowers wrapped and stuck. If not discovered in time, it will cause quality accidents such as cotton ball yarn. For Siro compact spinning, because the pressure of the front rubber roller needs to be increased, the front roller easily generates torsional vibration, resulting in deterioration of yarn evenness, thick details and other indicators.
In this regard, Rizhao Yuhua Company cooperated with Zhejiang Tianxi Holding Group and invested 30 million yuan to import the most advanced German special equipment for rollers to produce ultra-high-precision rollers without mechanical rollers. After the roller surface has undergone high-frequency heat treatment, hard chromium plating and special polishing, the tooth surface is completely smooth and wear-resistant, and the two sides of the tooth top are small arcs to ensure fiber control and stable holding force. After installation, it runs smoothly without moving or bending, and its performance and quality are stable. It can minimize harmful mechanical waves that appear in the spinning process, and the mechanical wave-free rate reaches more than 97%.
With the development and application of Siro compact spinning technology, more and more cotton textile companies have begun to use Siro compact spinning technology in recent years. In the past, when switching between Siro compact spinning and general compact spinning, only compact spinning gathering parts could be replaced, so spinning companies had to equip two sets of gathering parts. Rizhao Yuhua Company’s Siro compact spinning technology only needs to replace the additional wear-resistant material on the surface, which canIt is convenient to switch between compact spinning and siro compact spinning without the need to equip two sets of gathering parts, which is easy to use and low cost.
In recent years, Rizhao Yuhua Company has continued to pay attention to the progress in the field of energy saving and consumption reduction of compact spinning products. At present, negative pressure fan products usually use traditional induction motors. With the emergence of rare earth cobalt permanent magnets and neodymium iron boron permanent magnet materials, the development of permanent magnet motors has entered a new era. Compared with traditional electric motors, high-efficiency permanent magnet motors have higher efficiency and power factor during startup and operation, and have significant energy-saving effects. The negative pressure fan using a permanent magnet motor generates more than 10% less current during normal operation than an excitation motor.
In addition, the innovation of compact spinning air suction system components also provides options for spinning enterprises to save energy. The company’s YF1 compact spinning system adopts a fluid dynamic structural design and energy-saving fan technology, which has small air duct resistance and high fan efficiency. Under the same conditions of using an upper suction structure, the company has the same power fan and frequency converter. The negative pressure value of the negative pressure gathering port of our compact spinning products is about 200Pa higher than that of other compact spinning products. Under the condition of the same negative pressure at the negative pressure gathering port, the frequency converter frequency of the fan of the company’s products can be reduced by 2 Hz. Taking a 5.5kW fan as an example, when the frequency is 56Hz, the current is 6.3A; when the frequency is 54Hz, the current is 5.8A, and the energy consumption saved by each machine is 0.279kW/h. For example, if the operation is 340 days a year, 22 hours a day, the electricity cost is 0.9 yuan/kWh, and 480 spindles/unit, 10,000 spindles can save 39,400 yuan in electricity costs per year. In other words, compared with other current models of compact spinning, Yuhua YF1 compact spinning can save nearly 40,000 yuan in electricity bills per 10,000 spindles.
Compact spinning is a systematic product, in which accessories such as the weighting arm, steel ring, and mesh ring also play a particularly important role. Cotton textile companies should prioritize accessories during the process of selecting compact spinning accessories. Equipment suppliers, choose fabric equipment with good cost performance. (Guan Yancheng of Rizhao Yuhua Machinery Co., Ltd.)
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