The invention relates to a device (S) for separating fragments of particles (p) from said particles, including a floor (1) that is arranged so as to receive said particles and said fragments and is connected to a first means (2) that is arranged so as to animate said floor (1) with a vibrating movement, said floor (1) being bored with openings (3) in order to allow said fragments, but not said particles, to pass through said openings (3), and a ceiling (7) arranged substantially parallel to said floor (1). The device also includes a second means (8) arranged so as to move said ceiling (7) between a first position in which it is located at a distance (d) from the floor (1) and a second position in which it is in contact with the floor (1) so that particle fragments which are stuck in said openings (3) are ejected therefrom.Dispositif (S) de séparation de cassons de particules (p) desdites particules, comprenant un plancher (1) agencé pour recevoir lesdites particules et lesdits cassons, connecté à un premier moyen (2) agencé pour animer ledit plancher (1) d'un mouvement vibratoire, ledit plancher (1) étant percé de orifices (3) pour laisser passer au travers desdits orifices (3) lesdits cassons mais pas lesdites particules, et un plafond (7) agencé sensiblement parallèlement audit plancher (1). Le dispositif comprend en outre un second moyen (8) agencé pour déplacer ledit plafond (7) entre une première position dans laquelle il se trouve à une distance (d) du plancher (1) et une seconde position dans laquelle il est en contact avec le plancher (1) de sorte que des cassons de particules coincés dans lesdits orifices (3) en soient expulsés.
