DRAWING MACHINE HEAD FOR COLD ROLLING THREAD REINFORCING BAR

The utility model discloses a drawing machine head for cold rolling thread reinforcing bar which belongs to a machine for building material industry. The utility model is composed of a body 4, cap plates 6, hand wheels 1, a shaft sleeve 3, a worm screw 2, a worm wheel 8, a group of fusiform brackets 9, pin rolls 10, a bearing 12, and a mill rolls wheel 11, wherein, the front and the back of the body 4 are provided with cap plates 6, the both sides of the body 4 are provided with holes, and the body 4 is provided with worm screw 2; the worm screw 2 is protected by the shaft sleeve 3 and provided with a gear; the hand wheels are arranged in the holes; the worm wheel 8 is arranged in the body, the wheel edge of the worm wheel 8 is intercalated the groove of the inner wall of the body, and the top of the worm wheel 8 is provided with a gear which is matched with the gear of the worm screw 2; the circumference of the inner side of the worm wheel is provided with a group of split-shaped (wedge-shaped) involute arc lines which are symmetrical in 120 DEG, and a group of fusiform brackets are arranged in the group of split-shaped (wedge-shaped) involute arc lines; the inside of the brackets are provided with the pin rolls 10, and the outside of the pin rolls 10 is provided with the mill rolls wheel 11. The utility model can simultaneously, synchronously, rapidly, conveniently and exactly position the mill rolls wheel to cause the cold rolling thread reinforcing bar to be rapid and canonical.