With the development of the textile market situation, reducing the number of employees and reducing the labor intensity of employees has become an urgent issue. Under such a situation, how to make good use of the collective doffing device is a problem that equipment manufacturers and textile companies must solve.
In terms of equipment
1) Steel rings, spindles, yarn guide hooks, balloon rings, The pipe grabber and yarn separation plate are at the same center point, which is also a basic requirement for spinning production.
2) The traveler cleaner is used to clean the accumulated flowers on the traveler. In principle, the smaller the yarn number, the smaller the spacing. If the distance is too large, not only will the cleaning effect not be achieved, but the thread will also easily come out of the traveler during doffing, increasing the number of ends broken during operation; if the distance is too small, the traveler will not run smoothly or even get stuck, which may cause loose yarn, weak yarn, etc. Twisting yarn and breaking ends.
3) To select the appropriate height of the blade plate, it is generally appropriate to set the spinning position 20 mm to 25 mm from the top of the tube; in conjunction with the selection of appropriate traveler specifications, the When the yarn is small, the yarn does not touch the yarn partition plate; when the yarn is large, the yarn does not touch the bobbin head.
4) The ring plates should be ensured to be at the same height, and the height of the ring should be in the middle of the waste wire tray during doffing.
5) Choose a suitable flat and wipe cycle. The condition of the equipment is the basis for normal production. It is required to carry out a thorough cleaning every half a month, carry out partial maintenance work every four months, and do a good job of lubrication and daily maintenance. Each unit can do a good job based on its own accumulated experience. Make your own maintenance plan.
6) Choose a suitable traveler replacement cycle. A reasonable traveler cycle has a great impact on end breakage. If the cycle is too long, the spinning channel will be seriously worn, and in mild cases, it will be scratched. Damage the yarn, resulting in reduced strength, yarn details, and severe neps. A reasonable cycle should be explored based on spinning speed, production variety, spinning form, traveler type and manufacturer.
7) Choose a suitable tail yarn cleaning cycle. The cleaning of the tail yarn has a great relationship with the yarn retention rate during startup, because the tail yarn will interfere with the normal yarn operation during startup and continuously Collisions and friction will impact normal yarns, resulting in increased breakage and increased yarn hairiness, so a reasonable cleaning cycle must be established.
8) Maintain the collective doffing device to ensure that the height, entry and exit, left and right positions of the air frame are normal, and the movements are in place.
Technical aspects
1) Use a reasonable spindle speed curve to ensure that the yarn remains before doffing head rate. The spindle speed curve can be refined into multiple stages, and the entire speed change process should be as smooth as possible to avoid sudden acceleration and premature deceleration, so as to maximize the balance between production and life.
2) Select the appropriate shape and quality of the traveler. Select the corresponding traveler model according to the model of the steel ring. The opening should not be too large, but it must ensure that there is sufficient passage for the yarn; and the principle of selecting the weight is that the yarn does not touch the yarn separation plate when the yarn is small, and the yarn does not rub against the yarn separation plate when the yarn is large. The thread does not touch the bobbin head.
3) The corset yarn (the yarn wrapped around the yarn body when doffing) uses 0.5 to 3 turns as the basic number of turns. The higher the yarn count, the more turns it will have, and vice versa. The less.
4) In principle, the less tail yarn (the insurance yarn wrapped around the waste silk disc) the better, but when pulling out the yarn, make sure that the yarn is cut and the insurance yarn cannot Being pulled away.
5) Ensure that the spindle can suddenly stop within the braking time after rotating at a sufficient speed, so as to reduce the weak twist in the roller triangle area, which is especially important for ring spinning.
6) The yarn starting position (the position where the ring plate rises during doffing) should in principle be higher than the yarn cutting knife to ensure that the yarn is easy to cut.
7) The middle yarn position (the highest position to which the ring plate is raised when driving) must not only ensure that the downward distance is sufficient to stretch the braided yarn, but also cannot cause the downward distance to be too long. When the yarn breaks, the reaction of the winding machine must be taken into consideration, and the unwinding difficulty of the winding machine must not be caused by the middle yarn being too high.
8) When starting the spindle, it is necessary to ensure that there is enough speed to open the balloon for timely twisting, and at the same time, it is not possible to cause excessive instant tension and break the yarn due to excessive spindle speed. The thread must be combined with the speed of the lower ring plate to pull the braided yarn apart.
Operation aspects
1) Blocking the car Workers must ensure the yarn retention rate before doffing. It is generally required that the whole machine should not exceed 5. After the doffing machine is stopped, the bellows should be taken out in time to ensure that the flute suction and the negative pressure of the concentrated spinning are normal.
2) Doffers should follow up the doffing machine in a timely manner and try to participate in the doffing process as soon as possible, pick out unqualified bobbins, remove and replace the bobbins. Remove the yarn tubes that have not been removed from the bobbin, and clean up the broken yarns on the yarn guide hook and the mouth of the flute tube, so as to shorten the doffing time and start the machine in time.
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