Screw rod assembling unit

The utility model belongs to the technical field of screw rod assembly, and discloses a screw rod assembly unit which comprises a screw rod clamping and rotating mechanism, a screw rod sleeve positioning and clamping mechanism and a tip which are sequentially arranged in the length direction of a screw rod sleeve. The lead screw clamping and rotating mechanism is connected with a first servo mechanism which drives the lead screw clamping and rotating mechanism to reciprocate in the length direction of the lead screw sleeve. The lead screw clamping and rotating mechanism comprises a clamping module used for clamping one end of a lead screw and a rotating driving unit used for driving the clamping module to rotate. The screw rod sleeve positioning and clamping mechanism comprises two screw rod sleeve clamping blocks which are oppositely arranged and a first opening and closing driving unit for driving the two screw rod sleeve clamping blocks to be opened and closed; the end, away from the lead screw sleeve posi