Vertical batch freezer (1) for preparing a pasty food product, comprising a frame (2) having an upper bearing plane, a tub (3) open on top for containing the food product to be batch frozen, at least one refrigeration cylinder (4) provided with a cavity (4a) inside which said at least one tub is at least partially and removably housable, at least one grip element (5) to remove/introduce said tub (2) from/into said cavity (5a), and fastening means (6) to reversibly prevent the rotation and/or translation of said tub (3) with respect to said frame (2) of said batch freezer (1), at least when said tub (3) is housed inside said cavity (5a) of said refrigeration cylinder (5), characterized in that said reversible fastening means (6) comprise at least one retaining element (7) and at least one hooking element (8) for said retaining element integrally constrained to said upper plane of said frame, said at least one retaining element (7) being movably constrained with respect to said tub (3) between a position (PI) of disengagement from said at least one hooking element (8), wherein said tub (3) is removable from said cavity (5a), and a position (P2) of engagement with said at least one hooking element (8), wherein said tub is locked to said frame.Congélateur discontinu vertical (1) pour la préparation d'un produit alimentaire pâteux, comprenant un cadre (2) ayant un plan d'appui supérieur, une cuve (3) ouverte sur le dessus pour contenir le produit alimentaire à congeler en discontinu, au moins un cylindre de réfrigération (4) muni d'une cavité (4a) à l'intérieur de laquelle ladite ou lesdites cuves peuvent être logées au moins partiellement et de manière amovible, au moins un élément de préhension (5) pour retirer/introduire ladite cuve (2) de/dans ladite cavité (5a), et des moyens de fixation (6) pour empêcher de manière réversible la rotation et/ou le déplacement de ladite cuve (3) par rapport audit cadre (2) dudit congélateur discontinu (1), au moins lorsque ladite cuv
