Interpretation Of Design And Management Experience Of Spinning Drafting Mechanism

< p > < strong > improving the cleaning method of the upper pin < /strong > < /p >.

< p > < strong > reduce frequent disassembly < /strong > < /p >.

< p > SX2-6833B type carbon fiber upper pin adopts a href= "//www.sjfzxm.com/news/index_c.asp" > high strength carbon fiber < /a > nylon composite material injection molding, with high strength, high precision, no deformation, antistatic, long life and so on.

The upper pin is composed of an upper pin rack, a positioning slot, a positioning tongue, a movable clamp plate, a supporting small spring, an upper pin spring and a spacer block, and the structure design is scientific and reasonable.

Compared with the metal upper pin, the CV value of the yarn on the top of the carbon fiber decreased significantly, the roughness and detail decreased significantly, and the spindle error also decreased significantly.

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< p > when a flat car is wiped, the maintenance worker can lift the cradle first. The lower end of the upper pin of the carbon fiber is used to clean the top and lower ends of the upper and lower ends of the carbon fiber brush, and then use the bamboo sticks to twist the upper and lower roller bearings to hold the ends of the handle.

But the problem is that the dead flowers between the upper left and right movable clamp plates and the upper aprons are not easy to remove, and the dead jaws are easily formed to affect the yarn quality.

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< p > another method is to set up special person to use compressed air to blow up the lower end of the carbon fiber upper pin and hang the < a href= "//www.sjfzxm.com/news/index_c.asp" > accumulate flower < /a >, and the dead flowers in the left and right movable clamp plates, so the cleaning effect is better.

But the premise is that the upper pin must be unloaded from the cradle. After such a unloading, a reverse (the upper pin is poured out from the container, then blown clean), one loading, the upper rack, the left side and the right side of the movable clamp plate fold more damage, and if it is not found in time, it will easily cause the yarn defects.

With the addition of one labor force and material consumption, the cleaning method will do more harm than good and should not be popularized.

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< p > our method is to lift the cradle while protecting the workers, do not have to unload the carbon fiber upper pin, push the left and right movable clamp plates with one hand, remove the apron with the other hand, place on the leaf plate of the spinning machine, and then finish the cleaning of the upper and lower ends, then put the upper aprons on.

The cleaning method avoids the damage caused by the frequent removal of the upper pin of the flat cart, and removes dead flowers in the left and right movable clippers. It is a convenient and quick way to clean up the pins, and is worthy of promotion.

Xinjiang Shihezi Haiyan Textile Co., Ltd. Li Jianxin < /p >

< p > < strong > increasing pressure bar spacer block < /strong > /p >

< p > < strong > improved > a href= "//www.sjfzxm.com/news/index_c.asp" > yarn > /a > /strong > /p >

< p > the pressure bar spacer block is made from a 100 mm long high alloy steel with 3 mm diameter and is fixed on the spacer block.

According to the different varieties of spinning, the height and position can be adjusted. When adjusting, it changes along with the spacer block, and changes with the change of jaw spacing. The smaller the distance between the jaws is, the lower the pressure bar is, the greater the angle of encirclement is, the stronger the friction force is, the weaker it is.

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Adding a pressure bar spacing block in the P > spinning drafting area is to add pressure rods in the floating zone between the apron and front rollers. The arc edge of the pressure bar contacts with the drafted bar, forces the channel of the fiber bundle to become a curve, increases the friction force boundary in the floating area, increases the friction field in the main drafting area, improves the control of the movement of the fiber, and makes the distribution of the fiber speed point close to the front jaw, which is beneficial to the improvement of the evenness of the strip.

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< p > we carried out experiments on the influence of the pressure bar spacer block on yarn evenness and yarn hairiness.

Experiments show that adding pressure bar spacer blocks can improve yarn evenness and reduce coarse details and neps, but for different types of yarns, the type of pressure bar spacer blocks should be selected reasonably to ensure the best yarn evenness.

In the spinning process, we should also select the appropriate spacer blocks and pay attention to the problems of turning the roving bar and turning out the hard head so as to achieve better yarn quality.

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< p > we also carried out experiments on the influence of the pressure bar spacer block on yarn strength.

Experiments show that the pressure bar spacer block affects yarn evenness, and then affects yarn strength. It has positive effect on yarn evenness. When spinning CJ9.7tex yarn and pressure bar spacer block is 2.5 mm, yarn strength is the best, 31.2% higher than normal yarn strength. The pressure bar spacer block has little effect on yarn strength of CJ7.3tex yarn, and the yarn strength is 2.4% higher than that of normal yarn when the pressure bar spacer block is 3 mm.

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< p > the pressure bar spacer block can improve the yarn evenness in cotton spinning, reduce coarse details and neps, but it has no obvious effect on the yarn Mao Yu. If it is not used properly, it will cause the increase of Mao Yu in fine yarn. It has little effect on yarn strength, and may reduce yarn strength when used improperly. Therefore, suitable pressure bar spacer blocks should be selected for different types of yarns in cotton spinning.

Wu Xueping, Jiangnan University, Jiangsu, Jiangnan University, Su Xuzhong, < /p >

< p > < strong > optimize the pressure bar parameter < /strong > /p >

< p > < strong > avoid frequent adjustment of location < /strong > < /p >.

In order to avoid changing the location of the pressure bar again when replacing the yarn varieties, and to weigh all factors, we choose the best position of the pressure bar to adapt to the yarn of most varieties. We apply the comprehensive evaluation method to select the best process of P.

Comprehensive evaluation is a multivariable evaluation method and multi index comprehensive evaluation technology. It is an evaluation method for processing and refining data in a complex system with multiple index information and quantitative methods.

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< p > we first determine the main indicators of all aspects of the study and establish an evaluation index system.

Then, the pformation of evaluation indicators (reverse index positive) was carried out. The five indexes of the experiment were dry CV, kilometer detail, kilometer thick section, neg number per gram and uneven CVb between blocks, all of which were reverse targets which needed to be positive (a certain index was subtracted from the maximum value of the index) respectively, and the five indexes were.

Next, we quantify the single index value in the same degree (also called dimensionless).

The weight of evaluation is established and the comprehensive evaluation value is calculated.

The weight and 1 indexes of the experiment are very important to the quality of spinning yarn and the quality of subsequent products. The weights of evaluation for setting five indexes are all 0.2.

Finally, comprehensive evaluation is carried out. The higher the comprehensive evaluation value is, the better the scheme is.

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< p > through the comprehensive evaluation value, it can be concluded that during the spinning of C14.6tex yarns and JC9.7tex yarns, the pressure bar should be installed at 65 mm of the divider scale and 30 mm from the lower surface of the divider, so that it is the most suitable location.

The position of the pressure bar is 65 mm in the divider scale. The height is 30 mm from the bottom surface of the divider. It can be used as the actual production location of the plant. In the process of replacing the yarn variety, it is unnecessary to adjust the pressure bar position, which can shorten the time of changing the machine platform and improve the production efficiency.

In short, installing pressure bar in the back area of spinning frame is a project with small investment effect and is worth promoting.

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