During the whole carding process, the card licker-in plays an important role in removing impurities in the fibers and decomposing the fibers into single fibers. The structure of the double twisting unit of the double twisting machine mainly includes the spindle braking device, the spindle part of the double twisting machine, the yarn winding device, and the special device of the double twisting unit. Carding machines are used to process cotton fibers and chemical fibers and belong to textile machinery.
According to the spinning process, carding is an important process. The front process of the carding machine is the opening and cleaning machine, and the latter process is the drawing frame (carding process) or the sliver coiler (combing process). Grinder A spinning machine that turns fiber strands into rovings.
The main function is to draft and twist, and to wind the roving into a certain package to meet the processing requirements of the spinning frame. Practice has proved that the licker-in on the carding machine can decompose 70~80% of the fiber bundles in the cotton lap into single fibers, and remove about 75% of impurities. The poor working environment of the licker-in can not only affect the work and study effect of this carding area, but also due to insufficient loosening and impurity removal, these research fiber bundles and impurities are sent to the second carding area in China, which increases the cover The staff burden between the board and Xinjinlong directly affects the quality of the cotton web by affecting the role of the carding area in the second part of the world.
To strengthen the effect of combing and purifying the mood of the candidates, there are two (1) increasing the speed of the licker-in. Through experiments with different licker-in speeds and different outputs, it is found that with the increase of the licker-in speed, the weight of the cotton bundle changes from the licker-in to the comb. The percentage of machine transfer is reduced and the carding degree is increased. Without increasing the percentage of bale weight fed into the cylinder, the relationship between bale rate and licker-in speed is: When the bale weight increases by 1 kg, the licker-in speed should be increased by 125 rpm. When Xinjinlong is accelerated at the same time or the output range of the carding machine changes greatly, this relationship will change greatly.
According to practical experience, except for some low-grade single fiber strength is poor cotton, when using the old standard flexible line, if the speed of the licker-in roller to choose 800-1000 rpm (considered to correspond to the hydraulic cylinder speed) ordinary old card, the quality Good cotton net, neps, less impurities, and no damage to fiber length. This is because the centrifugal force increases, the growth rate of the belly noil, and the particle impurities in the cotton net are significantly reduced. By improving the degree of partial disintegration of the fibers of the tandem barbed, the workload and carding area of the second plate cylinder is reduced, the flower and flower copy of the needle cover is also reduced.
Table 2-1 is the comparative research data on some problems of No. 14.58 yarn before and after the accelerated development of the licker-in. Data analysis shows that after the acceleration of the licker-in, the influence of neps and impurities is reduced, but the reduction of neps is more significant, about 25%. At the same time, the weight of the cover flower can be reduced by 15% (the speed of the cover plate remains unchanged), and the needle flower is reduced by 8%.
All these prove that the carding efficiency is significantly improved after the thorn speed is accelerated. The ratio of licker-in speed between cylinder speeds should keep the job innocent. Generally speaking, the surface speed of the roller should be 40%-70% larger than that of the licker-in. If the ratio is too small, the surface of the fiber will affect the transfer roller. The poor population increases the neps of the back flower at one time.
A186 type high-yield carding machine licker-in speed development is generally 1000-1450 rpm. The stabbing speed corresponding to the Silin speed is as follows: when the cylinder speed is 290 rpm, the drum speed can be 1000 rpm, the cylinder speed is 320 rpm, and the drum speed can be 1150 rpm, when the Jilin speed is 360 rpm 1300 rpm for the drum, 400 rpm for the cylinder, and 1450 rpm for the licker-in. After the licker-in is accelerated, the centrifugal force will increase, and the noil rate of the rear belly will increase accordingly.
Due to the fact that a large part of impurities are removed, and the correlation coefficient of the rupture of impurities can be increased after the acceleration of the licker-in, the number of impurities in the cotton web is small and small.
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