06. At what level is the yarn recovery rate of self-networking generally controlled?
Answer: The yarn waste rate on the automatic winding machine is not an indicator that can be controlled individually. The generation of silk waste It is the result of the knotting behavior of the winder. Under the premise that the yarn suction amount during self-tangling jointing is completed, it is directly linked to the number of knots. Therefore, the so-called yarn recovery rate should be the comprehensive result of the bobbin quality from the previous spinning process, the cutting amount of the electronic yarn clearer and the one-time knot rate of the automatic winding machine. It cannot be controlled independently on the automatic winding machine. indicators.
07. Self-winding yarns often have random yarns and web yarns (spider web yarns). How to solve?
Answer: Generally, we start from the following aspects:
(1) Check whether the tension disk contains debris, random yarn and waste yarn and remove them;
(2) Check whether the suction negative pressure is between 38-42 and adjust it;
（ 3) Check whether the large and small suction nozzles and mouths have burrs and are smooth;
(4) Check whether the yarn pressing rod is deformed and adjust it;
(5) Check whether the process tension design is reasonable and Optimize;
(6) Check whether the distance between the drum surface and the large suction nozzle is reasonable and optimize it;
(7) Slow down the groove drum appropriately Speed;
(8) Set the yarn suction action of the large suction nozzle to 3 times (if the yarn cannot be sucked for 3 times, the drum will stop rotating to avoid repeated ineffective actions). If the yarn is not sucked, let the operator handle it. Check the yarn package first. If there is any messy yarn on the surface, peel it off before driving.
08. How to make better use of the electric cleaning function on the automatic winding machine?
Answer: This question is too big to answer or answer poorly. I would like to give you some opinions. Throw bricks. The electric cleaner on the winding machine records the yarn defect data (full inspection) of all yarns, including those that have been removed and those that have not been removed.
These data, conventional applications, can guide us back toGo over and adjust the previous spinning process, roving and the previous processes and even the cotton matching process. If any kind of yarn defect is abnormal, for example, if the neps exceed the standard, we can trace it back to the previous process and which processes need to be adjusted, or even the raw materials are defective. The details of the slub can be traced back to the previous process of spun yarn and roving according to the length, size, and shape to see if it is an equipment problem or a process problem. Of course, if the single spindle of the winding machine can be traced back to the single spindle of fine yarn and the single spindle of roving, the problem will be easier to solve.
09. The doffing time of 32S variety 1 is 2 hours and 45 minutes, and each shift is 12 hours. How to arrange the doffing time? What is the optimal number of doffing units for spun yarn (T/C32S) per 4 people per 12 hours (manual and doffing machine)?
Answer: In order to ensure the bobbin capacity and improve the production efficiency of the automatic winding machine, it is recommended to arrange the winding in 48 hours. Yarn time arrangement and doffing table, a cycle of 2 days and 2 nights.
Specifically: the first doffing time is 170 minutes (plus the doffing team’s doffing start time 5 minutes), 48 hours × 60 minutes ÷ 170 minutes = 16.94 ≈ 17 doffing, just arrange the 17 doffing according to the reasonable doffing table of 48 hours.
The T/C32S doffing time is 170 minutes (including the doffing team’s doffing time) , 12 hours × 60 minutes ÷ 170 minutes = 4.24 doffing/shift. Each shift lasts 60 minutes for eating and going to the toilet. If there is no cleaning work, the number of doffings per 4 people per 22 hours is 22 hours × 60 minutes ÷ 5 minutes / doffing = 132 doffings. The optimal number of spinning doffing stations is 132 Doffing ÷ 4.24 doffing/shift = 31 units.
If you want to do cleaning work at the same time, you need to measure how much time it takes to make one machine on site. Now let’s assume it is 0.5 hours. It takes 3 hours for each person to make 6 machines per shift. The number of doffing for every 4 people in 8 hours is 8 hours × 60 minutes ÷ 5 Minutes/doffer = 96 doffing units. The optimal number of doffing units for fine yarn is 96 doffing units ÷ 4.24 doffing units = 23 units (because the work load of the crane operator is greater than that of the doffer, the number of units for cleaning work can be reduced to 2 units , the other 3 people make 7 units each).
Manual doffing and doffing machine doffing take about the same time. Machine doffing only reduces the labor intensity of doffing, so the number of doffing units is the same.
10. What are the differences in the meanings of the parameters of Loepfe clearers and Uster clearers?
Answer: According to the detection principle, electric cleaners are divided into photoelectric type and capacitive type. Loeffy electric cleaner is photoelectric type. , Uster electric clear is capacitive type.
The photoelectric electronic yarn clearer measures the geometric quantities (diameter and length) of the yarn defect shape through photoelectric The system converts into corresponding electrical pulse signals for detection, which is similar to human visual detection of yarn defects. The entire device consists of a light source, a photoreceptor, a signal processing circuit, and an actuator. When the yarn is running at high speed, it passes through the photoelectric detection slot. On one side of the slot is a detection light source composed of an infrared luminous tube and an optical device. The optical device acts as a diffuser and produces the effect of a three-dimensional light source, thus improving the detection ability of flat yarn defects. get improved. The other side of the slot is a photoelectric receiver, which uses a silicon photovoltaic cell. When yarn defects (slugs, double yarns, details, etc.) appear on the yarn, the light-receiving area of the silicon photovoltaic cell changes, and the amount of light received and the output light of the silicon photovoltaic cell change. The current changes accordingly, and the change amplitude of the photocurrent is proportional to the diameter change of the yarn defect. When the yarn running speed is constant, the longer the yarn defect, the longer the photocurrent change is maintained. In this way, the photoelectric electronic yarn clearer converts the changes in the diameter and length of yarn defects into changes in the amplitude and width of the photoelectric receiver output current pulse, thereby achieving the purpose of photoelectric detection of yarn defects. The current pulse output by the photoelectric receiver is processed by the subsequent signal processing circuit. If the amplitude of the electrical signal output by the processing circuit exceeds its set value, the cutter drive circuit is triggered to work, driving the cutter to cut the yarn and remove yarn defects.
Capacitive electronic yarn clearer uses a capacitive sensor to measure the yarn quality per unit length, thereby indirectly reflecting the yarn quality. Changes in cross-sectional area are used to detect yarn defects. The entire device consists of a high-frequency oscillator, capacitive sensor, detection circuit, signal processing circuit and actuator. The capacitive sensor as a detection element is composed of two metal plates. When no yarn passes between the plates, the capacitance is small. When the yarn passes at a substantially constant speed, since the dielectric constant of the fiber is larger than that of air, the capacitance increases, and the increased amount is proportional to the mass of the yarn per unit length; therefore, the change in the cross-sectional area of the yarn, that is Changes in mass per unit length are converted into changes in sensor capacitance. The high-frequency constant-amplitude wave from the high-frequency oscillator is modulated into an amplitude-modulated wave that changes correspondingly with the cross-sectional area of the yarn after passing through the capacitive sensor; the amplitude-modulated wave is converted into an electrical pulse signal by the detection circuit. Under the condition of constant yarn speed, the pulse signal amplitude and width are proportional to the yarn defect cross-sectional area increment and yarn defect length in the capacitor; the pulse signal is processed by the subsequent processing circuit. If the output telecommunicationWhen the signal amplitude exceeds its set value, the drive circuit is triggered to drive the cutter to cut the yarn and remove yarn defects.
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