The present invention relates to a scraping device which comprises: - a frame (18) is configured to move in a channel, - a scraper (20) connected to the frame (18) by a pivoting connection with a pivot axis (a20) is substantially horizontal and perpendicular to a longitudinal direction, - a control which comprises a rod (62) which is movable with respect to the frame (18) according to the longitudinal direction and a link (68) which connects the rod (62) and the scraper (20).
