Powder and granular material weighing apparatus

Abstract

Each of a plurality of scale units 10 that constitute a combination weigher is provided with a cut gate 11 attached to a lower portion of a powdery- or granular-material hopper 12, a feeding hopper 13 for temporarily retaining a powdery or granular material supplied from the cut gate 11, a gate-type weighing hopper 14 for weighing the powdery or granular material supplied from the feeding hopper 13, and a collecting chute 16 for collecting the powdery or granular material discharged from each weighing hopper 14 and supplying it to a wrapping machine or the like. A load cell 15 is attached to the weighing hopper 14, and the load cell 15 measures the weight of the powdery or granular material for performing combinatorial computing between the weighing hoppers 14. A dust-preventing bellow 18 is provided in between the respective constituting components: the cut gate 11, the feeding hopper 13, the weighing hopper 14, and the collecting chute 16. This makes available a powdery- or granular-material weighing apparatus capable of weighing a powdery or granular material at high speed.

Description

technical field [0001] The present invention relates to a powder and granular material metering device, and more particularly, the present invention relates to such a powder and granular material metering device. It is carried out in multiple unit scales of the combined scale, thereby increasing the dosing speed. Background technique [0002] In the past, in order to improve the measurement speed and measurement accuracy when measuring powder and granules, a two-stage charging type weighing device was used. Figure 12 Shown is the relationship between charging weight and charging flow rate and charging time in a metering device with two-stage charging method. like Figure 12 As shown, according to the metering device of the two-stage charging method, in order to increase the metering speed, the powder and pellets are supplied to the metering hopper at a large flow rate (large charging) until the metered value of the powder and pellet weight reaches the target weight (100%). ...

AI Technical Summary

Problems solved by technology

In (2) the method of increasing the flow rate of the large charge, also due to the inertia over-adjustment when the flow rate is switched from the large charge to the small charge, only a measurement value that does not reach the target weight can be obtained in the end

Furthermore, it has the disadvantage that it is necessary to control the switching of the flow rate from the large charge to the small charge, thereby resulting in an increase in the cost of the metering device

In addition, in order to ensure the accuracy of the metering, it is necessary to carry out small and time-consuming charging.

Therefore, there is such a problem in the metering device of the above-mentioned two-stage charging method: the metering speed cannot be increased above a certain level.

However, its disadvantage is that in the above-mentioned metering device with no-stage charging method, it is difficult to control the switching of the flow rate from large charging to small charging, and the cost of the metering device is increased.

Again, like the above-mentioned two-stage charging method, in order to ensure the metering accuracy, it is necessary to carry out small time-consuming charging. Therefore, there is such a problem in the metering device of the above-mentioned non-stage charging method: the metering speed cannot be increased to a certain level.

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