Taper one-way locking device

The utility model discloses a taper one-way locking device which comprises a die holder body and a mounting hole penetrating through the middle of the die holder body, a bar inlet is formed in one end of the mounting hole, a bar outlet is formed in the other end of the mounting hole, and at least two movable pressing blocks are arranged on the periphery of the mounting hole. Each movable pressing block comprises a pressing face making contact with a bar and a guide groove formed in the side wall of the movable pressing block, a bar feeding channel is defined by the pressing faces of the movable pressing blocks, and the width of each movable pressing block is gradually increased in the direction from the bar inlet to the bar outlet along the central axis of the mounting hole. According to the utility model, the plurality of movable pressing blocks are encircled to form a conical wedge block structure, when the bar material moves forwards towards the bar material outlet, the wedge block structure is in a loose