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The high-speed edgeless double twisting machine is an efficient equipment used in the textile industry for yarn twisting. Its high-speed operation (usually up to 8000-15000 revolutions per minute) and precise structure require extremely high operating standards. The following are key precautions during use, covering four aspects: safety, operation, maintenance, and exception handling:

1. Safety operation specifications

Check before starting

Protective devices:

Ensure that all safety doors and protective covers (such as spindle covers and leather belt wheel covers) are installed in place and undamaged to prevent high-speed rotating parts (such as spindles and dragon belts) from being exposed and causing injury;

Check that the emergency stop button (E-Stop) is functioning properly, and the device should come to a complete stop within 1 second after pressing it.

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Electrical safety:

The power cord is not damaged, and the grounding wire is reliably connected (grounding resistance ≤ 4 Ω) to avoid the risk of leakage;

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Electrical components such as motors and frequency converters have no dust accumulation on their surfaces, and the cooling fan is running normally to prevent overheating and fire hazards.

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Taboo during operation

Do not touch:

It is strictly prohibited to touch rotating parts such as spindles, dragon belts, yarn channels, etc. with hands during operation, and a safe distance of ≥ 30cm must be maintained;

; When cleaning broken yarn or adjusting tension, it is necessary to stop the machine and wait for 5 minutes (until the spindle completely stops) before operating.

Foreign object protection:

It is forbidden to place tools, fabrics, and other items on the top of the equipment or transmission parts to avoid getting caught up and causing damage or personal injury;

; Wearing loose clothing (such as scarves and workwear with loose cuffs) is prohibited in the workshop. Long hair should be tied up and a safety helmet should be worn.

After shutdown

Power off operation:

After shutdown, the main power switch should be turned off and a "Do not close" warning sign should be hung to prevent accidental startup;

; When cleaning the cotton fluff inside the equipment, use a specialized vacuum cleaner and do not blow it directly with compressed air (to avoid cotton fluff flying and causing fires).

2. Key points of operation process

Yarn preparation

Raw material adaptation:

Select the appropriate twist range (usually 300-2000 twists/meter) according to the yarn material (cotton, synthetic fiber, blended), to avoid yarn breakage caused by high twist or low twist affecting strength;

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Check the surface of the yarn for oil stains, knots, or hard debris to prevent jamming or damage to the spindle.

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Thread path:

Thread the yarn strictly according to the path specified in the equipment manual, ensuring that the yarn passes through all yarn guide hooks, tensioners, and yarn storage devices to avoid winding or friction;

; Adjust the tensioner pressure to a moderate level (usually 0.5-2N) to prevent yarn breakage caused by excessive tension or uneven twist caused by insufficient tension.

Parameter Setting

Speed Control:

Set the spindle speed according to the yarn specifications and equipment model. During initial operation, test drive at 50%~70% of the rated speed, confirm that there are no abnormalities, and then gradually increase to the target value;

; When switching between different batches of yarn, it is necessary to recalibrate the matching relationship between speed and twist (which can be detected by a twist meter).

Twist direction selection:

Choose S twist (left twist) or Z twist (right twist) according to product requirements. When changing the twist direction, adjust the running direction of the dragon belt or replace the twist direction gear;

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After the twist direction is converted, it needs to idle for 10 minutes to ensure the stability of the yarn twist direction.

III. Maintenance Requirements

Daily Maintenance

Cleaning and Maintenance:

After each shift, use a soft bristled brush to clean the cotton fluff on the surface of the equipment, with a focus on cleaning the spindle seat, dragon belt groove, yarn storage device, and other parts;

; Clean the surface of the electrical cabinet with a neutral cleaner every week, and prohibit the use of alcohol or gasoline (corrosive coatings).

Lubrication Management:

Add 2 # lithium based grease to the spindle bearings every 48 hours, with the amount of grease added based on the overflow of old oil.

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Check the belt tension of the dragon belt drive shaft every 200 hours and adjust it to a sag of 15-20mm (measured by pressing the middle of the belt with your fingers).

Regular maintenance

Key component testing:

Check the radial runout (≤ 0.05mm) and axial displacement (≤ 0.03mm) of the spindle every 500 hours, and replace the spindle if it exceeds the standard;

; Check the wear of the dragon belt every 1000 hours, and replace it if the surface crack depth is greater than 1mm or the length is greater than 50mm.

Electrical system maintenance:

Check the frequency converter parameters (such as acceleration time and deceleration time) for drift every 6 months, and recalibrate if necessary;

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The insulation resistance of the motor is tested annually (≥ 1M Ω), and if it is lower than the standard, the motor needs to be dried or replaced.

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