. I studied spinning frame. Is it difficult to make a three-automatic transmission? Can a master tell me what its principle is? Thank you.

Three automation refers to the automatic reset of the collar plate when driving, the automatic fall of the collar plate when parking, and the automatic completion when parking. The principle is as follows:

When spinning full yarn, the proximity switch (or length counting program) in the headstock sends a signal, and PLC instructs the main motor to turn off, and the spindle runs inertia, energizing the small motor of the collar plate, so that the collar plate can quickly descend to the bottom of the spindle. When the tail yarn winds 3-4 times, the spindle brakes and the spinning machine stops completely.

After doffing is completed, start the fan, the collar plate rises to a suitable position, the main motor is pneumatic, and the new wound yarn starts spinning.