Feeding device for supplying carbon paste to a paste transport machine for forming molded blocks, to manufacture electrodes, for aluminum smelting, the system comprises: - at least one storage hopper, designed to be used as a buffer for a paste flow arriving from an upstream manufacturing process; - at least one vibrating extractor downstream from the storage hopper to receive the paste flow, the vibrating extractor includes a base on which the paste moves; - at least one weighing hopper including a weighing system allowing to view the mass of paste it contains, and located downstream from the vibrating extractor to receive the paste flow; - a paste flow control system for the vibrating extractor, the control system being able to assume at least the three following positions: • a closed position, in which the flow control system is in contact with the base of the vibrating extractor and closes the outlet between the storage hopper and the vibrating extractor to stop the flow of the paste from going towards the vibrating extractor, • a dosing position, in which the flow control system opens the outlet between the storage hopper and the vibrating extractor and in which the flow control system is positioned at a first distance from the base of the vibrating extractor; • a finishing position, in which the flow control system opens the outlet between the storage hopper and the vibrating extractor and in which the flow control system is positioned at a second distance from the base of the vibrating extractor, smaller that the first distance. - at least one storage hopper, designed to be used as a buffer for a paste flow arriving from an upstream manufacturing process; - at least one vibrating extractor downstream from the storage hopper to receive the paste flow, the vibrating extractor includes a base on which the paste moves; - at least one weighing hopper including a weighing system allowing to view the mass of paste it contains, and located downstream from the vibrating extractor to receive the paste flow; - a paste flow control system for the vibrating extractor, the control system being able to assume at least the three following positions: • a closed position, in which the flow control system is in contact with the base of the vibrating extractor and closes the outlet between the storage hopper and the vibrating extractor to stop the flow of the paste from going towards the vibrating extractor, • a dosing position, in which the flow control system opens the outlet between the storage hopper and the vibrating extractor and in which the flow control system is positioned at a first distance from the base of the vibrating extractor; • a finishing position, in which the flow control system opens the outlet between the storage hopper and the vibrating extractor and in which the flow control system is positioned at a second distance from the base of the vibrating extractor, smaller that the first distance. • a closed position, in which the flow control system is in contact with the base of the vibrating extractor and closes the outlet between the storage hopper and the vibrating extractor to stop the flow of the paste from going towards the vibrating extractor, • a dosing position, in which the flow control system opens the outlet between the storage hopper and the vibrating extractor and in which the flow control system is positioned at a first distance from the base of the vibrating extractor; • a finishing position, in which the flow control system opens the outlet between the storage hopper and the vibrating extractor and in which the flow control system is positioned at a second distance from the base of the vibrating extractor, smaller that the first distance.