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1. A stepped pin loading mechanism, comprising a vibrator bowl, wherein a spirally rising discharge track is connected to an outer side of a hopper of the vibrator bowl, and a swivel plate, which is linked with a drive motor and revolves on swivel plate's own axis under the action of the drive motor, is provided on the discharge track, and several receiving slots running vertically through an outer circumferential wall of the swivel plate are provided on the swivel plate; the strip-shaped receiving slot consists of an inner segment and an outer segment, and the width of the outer segment is greater than that of the inner segment; a front baffle and a rear baffle, both of which are provided with a through opening running through the baffle in a longitudinal direction for stepped pins to pass through, are provided on the discharge track; an arc-shaped side baffle, which is located between the front baffle and the rear baffle to form a semi-enclosed structure, is provided on an outer circumferential side of the swivel plate; and the semi-enclosed structure is formed with an opening facing toward the hopper to communicate with the hopper; one end of the side baffle deviates from the through opening of the rear baffle, and the height of an upper edge of the side baffle gradually increases from the rear baffle to the front baffle so that an upper edge at the other end of the side baffle is as high as an upper side of the through opening of the front baffle.
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