Three-hopper type quantitative weighing and filling machine system and quantitative weighing method thereof

The invention relates to the technical field of quantitative weighing and filling, and discloses a three-hopper type quantitative weighing and filling machine system and a quantitative weighing methodthereof. The three-hopper type quantitative weighing and filling machine system comprises a machine frame, a discharge hopper, a first distributing hopper, a second distributing hopper, a third distributing hopper, a first weighing hopper, a second weighing hopper, a third weighing hopper and a controller. A filling hole is formed in the bottom of the discharging hopper. The first weighing hopper, the second weighing hopper and the third weighing hopper which can independently discharge materials to the discharge hopper are arranged above the discharge hopper. The controller is electrically connected with a first weighing sensor, a second weighing sensor, a third weighing sensor, a first releasing valve, a second releasing valve, a third releasing valve, a first discharge valve, a seconddischarge valve and a thir