Variable-diameter winding needle mechanism

The variable-diameter winding needle mechanism comprises a winding needle body, a half shaft of the winding needle body comprises an outer winding needle and a variable-diameter assembly located on the outer side of the outer winding needle, two horizontal guide grooves are formed in the front portion and the rear portion of the top of the outer winding needle, and an upper guide groove and a lower guide groove are formed between the two horizontal guide grooves in a left-right opposite mode. The reducing assembly comprises a movable arc, a movable rod, a spring and a spring seat, the spring seat is fixedly arranged in the second horizontal guide groove, the movable rod is movably arranged in the two horizontal guide grooves front and back, the front end of the movable rod extends out of the head of the outward winding needle, and the spring is elastically arranged between the rear end of the movable rod and the spring seat; and up-down movable blocks are arranged on the two sides of the bottom of the movable