Feeding structure and fastening device

A fastening device comprising a feeding structure, the feeding structure comprising:

• a feeding mechanism, one end of which is a feed end, another end of which is a discharge end, the feeding mechanism comprises a feed pipe and a conveying pipe that are in communication with each other, wherein a mounting part entering from the feed end of the feeding mechanism can be conveyed to the discharge end through the feeding pipe and the conveying pipe;
• a propulsion mechanism, which is provided on one side of the feeding mechanism and has a central axis that is parallel to a central axis of the feed pipe, the propulsion mechanism comprising a material receiving portion provided on a shell of the propulsion mechanism, for communicating with the discharge end of the feeding mechanism to receive the mounting part, wherein a propulsion unit action of the propulsion mechanism can push the mounting part conveyed to the material receiving portion and mount same in a target position;
• and
• a bending pipe joint connecting the feed pipe and the conveying pipe, the bending pipe joint is fixed outside the shell of the propulsion mechanism, wherein the bending pipe joint comprises a body with a central bore, wherein a first end of the bending pipe joint is fixedly connected to the feed pipe, and a second end of the bending pipe joint is movably connected to an end of the conveying pipe, wherein the bending pipe joint further comprises an opening on a side of the body of the bending pipe joint extending from the second end of the bending pipe joint toward the first end of the bending pipe joint, wherein the opening on the side of the bending pipe joint is structured relative to the conveying pipe so as to allow the conveying pipe to oscillate relative to the bending pipe joint through the opening to thereby allow the conveying pipe to move toward and away from the propulsion mechanism under the action of the propulsion mechanism via the opening, and wherein the first end of the bending pipe joint comprises a first connecting section and wherein the feed pipe is screwed into the first connecting section via a threaded connection.