A system for overturning tanks, in particular tanks of kneading machines, comprising: - a supporting structure; - an overturning unit, which is mobile along said structure between a lowered position and a raised position and can turn about an axis transverse to the direction of raising of said unit; - an actuation system for driving the movement of said unit between said lowered position and said raised position, and - a further actuation system (12, 14) provided for governing the movement of rotation of said unit independently of said movement between said lowered position and said raised position, whereby said system comprises a control unit configured for governing said actuation system and controlling the speed of the movement of translation of said unit between said lowered position and said raised position, and wherein said control unit is configured for governing said further actuation system and controlling the speed of the movement of rotation of said unit about said axis of rotation, characterized in that said control unit is configured for governing said actuation system and said further actuation system according to the following operating parameters: - a parameter K representing the ratio between said speed of translation and said speed of rotation; and - a parameter Q corresponding to the total rotation angle of the movement of overturning of the tank, wherein said parameter K and said parameter Q are variable according to the type of dough, in particular according to the value of density of said dough in such a way that: - for a type of dough characterized by a first density, said parameter K has a first value of parameter K and said parameter Q has a first value of parameter Q; and - for a second type of dough characterized by a second density lower than said first density, said parameter K has a second value of parameter K lower than said first value of parameter K, and said parameter Q has a second value of parameter Q higher than said first value of parameter Q. comprising: - a supporting structure; - an overturning unit, which is mobile along said structure between a lowered position and a raised position and can turn about an axis transverse to the direction of raising of said unit; - an actuation system for driving the movement of said unit between said lowered position and said raised position, and - a further actuation system (12, 14) provided for governing the movement of rotation of said unit independently of said movement between said lowered position and said raised position, whereby - a supporting structure; - an overturning unit, which is mobile along said structure between a lowered position and a raised position and can turn about an axis transverse to the direction of raising of said unit; - an actuation system for driving the movement of said unit between said lowered position and said raised position, and - a further actuation system (12, 14) provided for governing the movement of rotation of said unit independently of said movement between said lowered position and said raised position, whereby said system comprises a control unit configured for governing said actuation system and controlling the speed of the movement of translation of said unit between said lowered position and said raised position, and wherein said control unit is configured for governing said further actuation system and controlling the speed of the movement of rotation of said unit about said axis of rotation, characterized in that said control unit is configured for governing said actuation system and said further actuation system according to the following operating parameters: - a parameter K representing the ratio between said speed of translation and said speed of rotation; and - a parameter Q corresponding to the total rotation angle of the movement of overturning of the tank, - a parameter K representing the ratio between said speed of translation and said speed of rotation; and - a parameter Q corresponding to the total rotation angle of the movement of overturning of the tank, wherein said parameter K and said parameter Q are variable according to the type of dough, in particular according to the value of density of said dough in such a way that: - for a type of dough characterized by a first density, said parameter K has a first value of parameter K and said parameter Q has a first value of parameter Q; and - for a second type of dough characterized by a second density lower than said first density, said parameter K has a second value of parameter K lower than said first value of parameter K, and said parameter Q has a second value of parameter Q higher than said first value of parameter Q. - for a type of dough characterized by a first density, said parameter K has a first value of parameter K and said parameter Q has a first value of parameter Q; and - for a second type of dough characterized by a second density lower than said first density, said parameter K has a second value of parameter K lower than said first value of parameter K, and said parameter Q has a second value of parameter Q higher than said first value of parameter Q.