Airflow spinning machine (rotor spinning machine) is an efficient spinning equipment, and its use must strictly follow the operating specifications to ensure stable operation of the equipment and yarn quality. The following are key usage precautions, classified by equipment maintenance, process control, and safe operation:
1、 Equipment maintenance and upkeep
Cleaning cycle of spinning cup and combing roller: Clean the dust on the inner wall of the spinning cup every shift, and check the wear of the combing roller teeth tip every week.
Wear standard: If the tooth tip of the combing roller wears more than 0.2mm, it needs to be replaced. If the scratch depth on the inner wall of the spinning cup is greater than 0.1mm, it needs to be polished.
Case: A factory's yarn breakage rate increased by 30% due to the accumulation of dust caused by the failure to clean the spinning cup in a timely manner.
Anti blocking measures for cotton conveying channels: Check the bends of the cotton conveying pipeline daily and use compressed air to clean residual fibers.
Fiber detection: Install photoelectric sensors to monitor foreign objects such as metal and plastic in the cotton conveying channel in real time.
Negative pressure system pressure monitoring: Maintain spinning negative pressure between -3000 and -5000 Pa, and regularly check for clogged filter screens.
Energy saving suggestion: Use a variable frequency fan to automatically adjust negative pressure according to spinning speed, saving 15% -20% energy.
2、 Process parameter control
Spinning speed range: The spinning cup speed for conventional varieties is controlled between 60000-100000 rpm, while for high count yarns it can be increased to 120000 rpm.
Speed matching: The recommended ratio of the speed of the combing roller to the speed of the spinning cup is 1.5-2.0, as too high a ratio can cause flying flowers.
Twist setting and twist calculation: Set the twist coefficient according to the purpose of the yarn (such as 7.0-8.0 for knitted yarn and 8.5-9.5 for woven yarn).
Twist detection: Conduct a random inspection every 4 hours using a twist meter for measurement, with an error margin of ≤ 5%.
Temperature and humidity management workshop environment: temperature of 25-30 ℃, relative humidity of 60% -70%, too high can easily generate static electricity, and too low can cause fiber brittleness.
Humidification system: High pressure micro mist humidifier is used to ensure humidity uniformity deviation ≤ 5%.
3、 Safety operation standards
Check emergency stop before starting up: Test all emergency stop buttons to ensure response time is less than 0.5 seconds.
Protective device: Check if the spinning cup protective cover and the combing roller safety door are in place.
Abnormal handling of monitoring during operation: If abnormal vibration or noise is found in the spinning cup, immediately stop the machine and check the bearing and balance status.
Fire prevention measures: Flammable materials are prohibited from being piled up near the cotton conveying channel, and CO ₂ fire extinguishers are equipped.
Maintenance of spinning cup cooling after shutdown: Keep the fan running for 10 minutes after shutdown to prevent overheating and deformation of the spinning cup.
Lubrication management: Add high-speed bearing grease daily and use specialized grease (such as Krupp BE41-1501).