Methods Of Improving Yarn Evenness And Reducing Energy Consumption

Method I Use pressure bar in front and rear area of spinning frame

Establish a new friction boundary

Adding pressure bar to spinning frame is one of the ways to improve yarn evenness. The front area is equipped with pressure bar and spacer block to extend the control range of friction field, reduce the length of floating area, effectively control fiber movement, and improve yarn evenness. By using the upper pin of the pressure bar in the rear area, a new additional friction boundary can be established in the rear drafting area through the pressure bar, which is conducive to the drafting control of the whiskers in the rear area. The production practice shows that the use of the pressure bar in the front and rear areas alone can improve the yarn quality, but the use of the pressure bar in the front and rear areas at the same time can achieve better improvement results. When the pressure bar is used in the front and rear zones at the same time, the additional friction boundary in the front and rear zones is increased, so that the floating fiber can be effectively controlled, and the traction force is also increased, so we have made appropriate adjustments to the original process. The roving twist coefficient is reduced from 86 to 82, the front roller gauge is adjusted from 18 mm to 19 mm, and the front top roller pressure (twin spindle) of the pneumatic pressure cradle is increased from 140 N to 170 N. Through the above measures, the problem of excessive drafting force is alleviated, and the phenomenon of non opening drafting is basically eliminated.

At the same time, there are several points to be paid attention to when using the pressure bar in the front and rear area: first, the draft control and stability of the pressure bar, so as to improve the yarn evenness. The pressure bar must be smooth and free of burrs to prevent fiber aggregation and fiber damage. The installation position of the pressure bar must be parallel and not skewed, otherwise it is easy to cause the whiskers to turn sideways along the direction of the pressure bar during the untwisting process, affecting the untwisting effect; The second is to increase the cycle of turner tour to prevent roving sliver from turning up and affecting yarn quality; Third, the existence of the pressure bar makes the drafting area easy to fall, increasing the difficulty of cleaning. The cleaning work of the spinning drafting area should be strengthened, otherwise it will deteriorate the yarn quality level; Fourth, when using the pressure bar process, the cradle pressure should be corrected one by one to reduce the pressure difference between ingots and the quality difference between tubes; The fifth is to strictly control the relative humidity of the workshop at 55%~60%.

Method 2: Reasonable selection of yarn collector

Reduce hairiness and increase yarn strength

The collector is a common spinning equipment for spinning. The collector used by our company is a frame hanging type. Its main function is to collect the width of the whiskers during the drafting process, reduce the twisting triangle area, increase the use effect of the collector, and make the yarn structure compact, so as to reduce yarn hairiness and improve yarn strength. The production practice shows that the main advantages of the collector are: it is conducive to improving spinning speed, improving yarn quality, and saving cotton. However, improper use will increase yarn defects and breakage. In the process of use, attention should be paid to the advantages of reasonable use of the collector before reasonable configuration of spinning, but improper use, the length of the floating zone in the meeting area, the front top roller forward punching, the middle iron roller backward moving and other processes can cause yarn defects, increase breakage, and deteriorate yarn evenness. In actual production, attention should be paid to selecting the appropriate opening width according to the spinning variety.

At the same time, pay attention to the following issues. The operation patrol inspection and cleaning work shall be strengthened, and the collector shall be kept in good condition: if an ingot position is inlaid with impurities, jumps, misaligned position, poor lateral movement, roller and rubber roller winding occurs in the mill, the collector in the same cradle will be damaged and the rubber roller will be damaged, so that the collector will always be kept in good condition, and the other end will also jump easily, affecting the strip dryness, It may even result in a severed head. The bottom of the collector must be closely fitted with the roller to prevent the impact of the collector, so that the collector can play an active role in improving the yarn production and quality. The yarn quality will be affected by the incorrect position and jumping of the collector. Therefore, patrol inspection shall be strengthened to keep the collector in good condition and replace the damaged collector in time.

The use of the collector can properly increase the speed, but it should not be too high, otherwise it is easy to increase the details, and increase the number of detail defects of the winding machine, affecting the yarn quality and winding efficiency.

To prevent missing the collector. When feeding whiskers into the collector channel or when cleaning, the twisted fiber touches the collector and then the whiskers run out of the collector, which will cause the whiskers not to pass through the technology and worsen the evenness of the collector. Special attention should be paid to prevent this phenomenon.

Pay attention to cleaning the collector. Slubby yarn defects may occur when the collector pinches flowers, picks up work number paper, inserts neps, impurities or whiskers pass above or below the collector with inflexible transverse movement and jumping. This requires the barricade to conduct patrol inspection in time and do a good job of cleaning. The spinning frame must be equipped with air blowing and suction devices, otherwise the process parameters of the collector Liu Junmei, Jia Lixia, Zhang Xiufeng and the collector of the spinning frame are easy to accumulate, which will worsen the evenness.

Method 3 Transform the energy-saving driving mode of spinning machine cotton suction fan

2.18 million yuan can be saved every year

At present, all types of spinning frames in textile mills use separate motors to directly drive cotton suction fans to continuously absorb cotton yarn broken ends, flying flowers and dust through the flute. However, although this drive mode can have a good adsorption effect, it will cause energy consumption loss in motor load operation and increase spinning cost greatly. Therefore, it is of practical significance to explore the power load consumed by the main motor in the actual operation, and to drive the cotton suction fan to run by the drive mode of mechanical transmission and spindle connection, so as to improve the dynamic working efficiency of the fan more effectively and achieve better energy-saving effect.

At present, the rated power of the cotton suction fans on spinning frames of most textile mills at home and abroad is mainly 2.2l kW, and the other two are energy-saving fan motors (taking 420 spindle spinning frame as an example, the thinking of other spindle spinning machines is basically the same). The actual operating power values are more or less different due to the number of air suction flowers adsorbed on the filter screen of the cotton suction fan, Regardless of its rated power, the actual power consumption of the cotton suction fan motor is about 1.65~1.8kW after repeated measurement.

On the basis of theoretical analysis, the energy-saving technical design of fan is now carried out. First, it is necessary to remove the fan motor and keep the original suction box position unchanged, then install the fan blade on the impeller shaft, which is connected with the impeller shaft by backstop or overrunning clutch, The purpose is that when the main motor is running, the main shaft and the impeller shaft run synchronously, but after the main shaft stops, because the impeller inertia is under the action of the backstop or the overrunning clutch, the fan blade continues to run in the original running direction for a period of time, so that the residual negative pressure can absorb some dust and impurities, and at the same time, the machine parts will not be damaged due to the high speed and inertia of the fan blade. The impeller shaft is fixed with a bearing seat, and the impeller shaft is equipped with a pulley, This pulley can be disassembled and replaced as required. Another pulley is installed on the main shaft, and then the two pulleys are connected with a drive belt. A tension pulley is designed between the two pulleys, so that the belt tension can be adjusted after replacing the pulley during spinning.

The energy-saving drive mode of the spinning machine cotton suction fan designed according to this scheme has undergone technical renovation, parts design, manufacturing, assembly and operation on the spinning machine table. After several times of multi shift operation and observation for a long time, the fan speed always changes with the belt wheel diameter corresponding to the spindle process speed change, so that its speed is maintained or higher than the original speed, The air volume and negative pressure can meet the requirements of absorbing broken ends and dust, without any unexpected mechanical failure or adverse situation. The daily maintenance is simple and easy, and the disassembly is extremely convenient. The cotton suction fan has reached the expected perfect working state, and achieved a good energy saving effect. This shows that the energy saving is significant. After the transformation, the actual measurement of the maximum current value of the part consumed by the fan of the main motor is 22 hours a day and 350 days a year. The whole company is calculated with 357 spinning machines and 0.6 yuan per kilowatt hour, saving 2.18 million yuan per year.