Spinning frame for combed cotton blended yarn preparation and control method thereof

A spinning frame for preparing combed cotton blended yarn comprises a yarn feeding mechanism and a drafting mechanism. The yarn feeding mechanism comprises two winding wheels arranged in a spaced mode and an adjusting assembly used for adjusting the distance between the two winding wheels, the yarn sequentially winds around the two winding wheels, the part, located between the two winding wheels, of the yarn is sleeved with a balancing weight, and a distance sensor used for monitoring the position of the balancing weight is arranged below the balancing weight; the drafting mechanism comprises two drafting assemblies which are arranged in parallel, each drafting assembly comprises a drafting belt which is rotationally arranged, a drafting channel for the yarn to penetrate through is reserved between the two drafting belts, the yarn makes contact with the two drafting belts in the drafting channel, and cleaning assemblies used for cleaning the drafting belts are arranged on the sides of the drafting belts. The