06、At what level is the return rate of self winding generally manipulated?
A: The yarn return rate on an automatic winder is not an indicator that can be manipulated alone, but is a result of the knotting behavior of the winder. It is directly linked to the number of knotting times, provided that the amount of yarn absorbed during self-winding is designed. Therefore, the so-called yarn return rate should be the combined result of the yarn quality of the previous spinning process, the electronic yarn clearer cutting volume and the knotting rate of the automatic winder, which is not a separate indicator that can be manipulated on the automatic winder.
07、Self winding yarn often has messy yarn and web yarn (spider web yarn), how to solve it?
A: Generally, the following aspects should be taken into consideration.
(1) Check the tension disk for debris, disordered yarns and yarn returns and remove them.
(2) Check if the negative pressure of the suction air is between 38-42 and correct it.
(3) Check that the large and small nozzles and mouths are clean and free of burrs.
(4) Check if the yarn press rod is deformed and corrected.
(5) Check if the process tension design is reasonable and optimized.
(6) Check the surface of the cylinder and the spacing between the nozzle and the big nozzle to make sure they are reasonable and optimized.
(7) Slow down the cylinder speed appropriately.
(8) Set the suction action of the big nozzle to 3 times (if it can't be sucked for 3 times, the cylinder will stop rotating to avoid repeated ineffective action), if the yarn is not sucked, the blocker will deal with it and see if there is any messy yarn on the surface of the cylinder, if there is, peel it off and then drive again.
08、How can I make better use of the electric clearing function on the automatic winder?
A: This question is too big to answer and not good enough. The electric clearing on the winder records all the yarn fault data of the spun yarn (full inspection), including the removed and retained yarn faults that are not removed.
This data, routinely applied, can guide us to go back and adjust the process in the front of the spinning process as well as the roving and further processes and even the cotton distribution process. Any kind of yarn defect that is not normal, such as an oversize knot, can be traced back to which and which processes need to be adjusted, or even to bad raw materials. Rough knot details can be traced back to the previous process according to length, size, and shape to see if it is an equipment problem or a process problem. Of course, if the problem can be traced from the winder single spindle to the fine yarn single spindle and the roving single spindle, it will be even easier to solve.
09. How to arrange the yarn drop time for a 32S variety with a drop time of 2 hours and 45 minutes, 12 hours per shift? What is the best number of spinning tables (T/C32S) and how many yarn drops per 12 hours per 4 persons (manual and yarn dropper)?
A: In order to ensure the capacity of the tube yarn and improve the productivity of the automatic winder, it is recommended to arrange the yarn drop table according to 48 hours, 2 days and 2 nights a cycle.
Specifically: a yarn drop time is 170 minutes (plus 5 minutes for the yarn drop team), 48 hours x 60 minutes ÷ 170 minutes = 16.94 ≈ 17 yarn drops, 17 yarn drops can be arranged according to a reasonable 48-hour drop table.
T/C32S a yarn drop time is 170 minutes (including yarn drop team drop time), 12 hours × 60 minutes ÷ 170 minutes = 4.24 yarn drop/shift. If we do not do cleaning work, the number of yarn drops per 11 hours per 4 persons is 11 hours × 60 minutes ÷ 5 minutes/yarn drop = 132 yarn drops, and the number of good yarn drops is 132 yarn drops ÷ 4.24 yarn drops/shift = 31 yarn drops.
If you want to also do cleaning work, then the site to determine how much time it takes to do 1 unit, now assume that 0.5 hours, each person needs 3 hours to do 6 units per shift, every 4 people 8 hours to drop the number of yarn for 8 hours × 60 minutes ÷ 5 minutes / drop yarn = 96 drop yarn, the number of good yarn drop yarn for 96 drop yarn ÷ 4.24 drop yarn = 23 units (because the workload of shaking the car is greater than the drop yarn workers, the number of units to do cleaning work can be reduced to 2 units, the other 3 people to do 7 units each). (The other 3 people do 7 units each).
It takes about the same time to drop yarn by hand and drop yarn machine to drop a car and give birth to a head, and the drop yarn machine only reduces the labor intensity of the drop yarn, so the number of drop yarn units is the same.
10、What is the difference in the meaning of the parameters of Lofty and USTER?
A: According to the detection principle, the electric clearer is divided into complete electric type and capacitor type, and the Lofty electric clearer is complete electric type and the USTER electric clearer is capacitor type.
The electronic yarn clearer is designed to detect yarn defects by converting the geometry of the yarn shape (diameter and length) into a corresponding electrical pulse signal through the electrical completion system, which is similar to the human visual detection of yarn defects. The whole device consists of a finish source, a finish receiver, a signal processing circuit and an actuator. When the spinning yarn runs at high speed, it passes through the completion detection slot. On one side of the slot is the detection completion source which is composed of infrared completion tube and completion device. The other side of the slot is the finish receiver, which adopts silicon finish cell. When yarn defects (thick knots, double yarns, details, etc.) appear on the spinning line, the finish area of the silicon finish cell changes, and the finish amount and output finish current of the silicon finish cell change, and the change amplitude of the finish current is proportional to the diameter change of the defects. When the spinning yarn running speed is constant, the longer the yarn defect, the longer the maintenance time of the change of the completion current. This is how the electronic yarn clearer converts the change in the diameter and length of the yarn defect into the change in the amplitude and width of the current pulse from the finish receiver to detect the yarn defect. The current pulse from the receiver is processed by the subsequent signal processing circuit. If the amplitude of the electrical signal from the processing circuit exceeds the set value, the cutter driving circuit is triggered to cut off the spinning yarn and remove the yarn defect.
Capacitive electronic yarn clearer uses capacitive sensor to measure the quality of spinning yarn per unit length, thus indirectly reflecting the change of spinning yarn cross-sectional area and detecting yarn defects. The whole device consists of a high frequency oscillator, a capacitance sensor, a detection circuit, a signal processing circuit and an actuator. The capacitance sensor as a detecting element consists of two metal plates, which have a small capacity when no yarn is passing between them. When the spun yarn passes through at an essentially constant speed, the capacitance increases because the fiber dielectric constant is larger than that of air, and the increase is proportional to the mass of the spun yarn per unit length; therefore, the change in the cross-sectional area of the spun yarn, i.e., the change in mass per unit length, is converted into a change in the capacitance of the sensor. The high-frequency equal-amplitude wave from the high-frequency oscillator is modulated by the capacitive sensor into an amplitude modulation wave that varies with the cross-sectional area of the spinning yarn; the amplitude modulation wave is converted into an electrical pulse signal by the detection circuit. Under the condition of constant yarn speed, the amplitude and width of the pulse signal are proportional to the increment of the cross-sectional area and the length of the yarn defect in the capacitor; the pulse signal is processed by the subsequent processing circuit, and if the amplitude of the output electrical signal exceeds its set value, the driving circuit is triggered to drive the cutter to cut off the yarn and remove the yarn defect.
Contact: Jeanne yang（MISS）
E-mail: [email protected]
Add: Room A2216/A2217,Double-Star Building,No 567 New South Middle Road, KunShan City JiangSu Province ,China.