Electronic yarn clearer is the main function in the winding process, can effectively remove the harmful yarn defect on the yarn, the purpose of improving yarn quality. To achieve this goal, it is required that the yarn clearer has fewer yarn defects, fewer mistakes, and high work efficiency during the clearing process. However, during the clearing process of the clearer, in some cases, abnormal phenomena such as many leaks, miscuts, and low efficiency may occur. It is necessary to understand the causes of the following faults and the processing methods to ensure the normal operation of the clearer.

Symptom 1: The half-cart or one post is leaky or uncut.

Possible causes of failure:
(1) Inappropriate setting of yarn parameters (material coefficient, yarn number) makes the yarn cleaner's overall machine gain low, the yarn switch is not fully opened or not opened at all, or the yarn clearing process parameters (threshold, length) are set Set too loose, causing missing or not cut.
(2) A failure of a part of the machine, an open or short circuit in the cable, or a malfunction in the machine control software.
Approach:
(1) Check the set parameters, re-arrange the yarn parameters or reduce the material coefficient value to increase the machine gain; at the same time, set the clearing threshold appropriately to reduce the leakage and improve the cleaning efficiency.
(2) Check whether the main cable and the 4# and 5# cables are damaged or not, and make a short circuit or disconnection. Replace the control board software chip 27C512 in the control box.

Symptom 2: The half-cart or one post is miscut, and there is a lot of breakage or chaos.

Possible causes of failure:
(1) Inappropriate setting of yarn parameters (material coefficient, yarn number) results in high yarn clearer gain, or too stringent clearing process parameters (threshold, length), resulting in miscuts, empty cuts, rewinding Difficult and inefficient.
(2) The internal circuit of the electric control box in the yarn clearer is faulty, the DC power supply noise exceeds the limit, and the control software may malfunction.

Approach:
(1) Check whether the yarn parameter setting is appropriate or slightly increase the material coefficient, reduce the machine gain, and properly select the clearing process parameters to achieve the best cleaning effect.

(2) Check if the DC power supply noise exceeds the limit (check the power supply noise with a 40 MHz oscilloscope) and process the over-range power supply.

(3) Replace the control software 27C512.

Symptom 3: The entire machine has many cuts, many broken ends, low efficiency, and difficulties in rewinding.

Possible causes of failure:
(1) The entire train yarn parameters and clearing process parameters are not set properly, the material coefficient setting is too low, the process parameters are set too strict, miscuts or blank cuts occur, and many breakages make rewinding difficult.

(2) The grounding of the system is not reliable, so that the interference is strung from the ground line, causing mis-cut or air-cut.

(3) The control box control software may be faulty.

Approach:
(1) According to the fault phenomenon treatment method, the yarn parameters and the clearing process parameters are properly modified to achieve the best yarn clearing status.

(2) Check whether the system grounding is reliable (the contact resistance at the connection point of each grounding point should be less than 4Ω). If the contact resistance is large, it should be processed to make it well contacted. Or add another standard ground wire to make the system reliable ground.

(3) Replace the control box control software chip 27C512.

Symptom 4: The yarn clearer leaks badly and the cleaning efficiency is low

Possible causes of failure:
(1) The clearer gain is low (the material setting is too large, the yarn number is set incorrectly, and the number is larger).

(2) The clearing process parameters are set too loose.

(3) The sensitivity of most test heads of the entire vehicle is low.

(4) The control box control software has failed.

Approach:
(1) Check whether the material coefficient setting is appropriate, retest the yarn to determine the appropriate material coefficient, or directly re-set the material coefficient by 0.3-0.5.

(2) Reasonably select the clearing process parameters (threshold, length) through the test to determine the best clearing threshold. In general, in order to achieve the elimination of the 9th-grade harmful yarn defect, the short thick section threshold is set to: S: 140% to 180%, L: 1.2cm to 1.8cm, long and thick, and the long detail threshold can be set according to the quality requirement.

(3) Adjust the sensitivity of the detection head and keep the consistency of all the detection head sensitivities as far as possible (so-called sensitivity consistency of the detection head, that is, the sensitivity of each detection head should be adjusted to the average sensitivity value of all the detection heads ± 5 words).

(4) Replace the control box control software chip 27C512.

Symptom 5: Clear yarn breakage occurs when the yarn clearer ends quickly (small yarn)

Possible causes of failure:
The reelback at the bottom of the yarn is uneven and miscut. In severe cases, yarns cannot be introduced to the yarn, which increases the detection signal of the yarn clearer and causes more yarn breaks.

Approach:
The yarn from the spun yarn workshop should not be rewinded immediately. Humidity must be equilibrated for a period of time to ensure that the inside and outside of the yarn are consistent and then rewind.


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November 22, 2021