Out-of-tolerance automatic material fetching powder scale

Abstract

The invention discloses an out-of-tolerance automatic material fetching powder scale, which comprises a bracket and a tapered scale hopper arranged on the bracket, wherein the tapered scale hopper isin inversely tapered arrangement and is suspended on the bracket through a plurality of evenly-distributed weighing sensors; the top and the bottom of the tapered scale hopper are independently provided with a material inlet and a material outlet; the bracket is provided with a material fetching tube; and one end of the material fetching tube extends into the tapered scale hopper, and the other end is connected with a conveying tube through a vacuum generator. Through a way that vacuum material absorption is adopted to discharge top residual materials in the tapered scale hopper, a material fetching amount can be accurately controlled, and in addition, the problem that overloading happens since various materials are accumulatively weighed can be solved. Meanwhile, the powder scale disclosed by the invention is also provided with an electric actuator lifting and lowering mechanism and a bevel gear transmission mechanism to control the vertical and circumferential movement of the material fetching tube so as to realize the accurate positioning of the material fetching tube, and the problem that overloading happens since various materials are simultaneously fed and weighed is solved.

Description

technical field [0001] The invention relates to a batching and weighing device for materials, in particular to an ultra-tolerance automatic feeding powder scale. Background technique [0002] In petrochemical, chemical, cement, glass, building materials, printing and dyeing, food, feed and other industries, it involves automatic batching and weighing of various powder and granular materials. The batching and weighing of powder and pellets generally adopts hopper scales, and the feeding of powder scales generally adopts air flow trough, screw conveying or vibration feeding. However, due to the difference in fluidity of powder and granular materials, the change of pressure in the silo, and the occurrence of ratholes or leakage in the silo, various feeding equipment cannot accurately control the material flow, resulting in the phenomenon of flushing, which cannot meet the weighing accuracy. . For negative deviations, it is easy to use inching feeding equipment to carry out re...

AI Technical Summary

Problems solved by technology

[0003] However, in practical applications, due to the fluidity of the material, it is impossible to accurately trap the over-tolerance material in the scale hopper through the discharge valve, or discharge the excess material through the discharge valve.

Moreover, if it is the case of accumulative weighing of multiple materials, the out-of-tolerance material is at the top of the scale, and the method of trapping the over-tolerance material in the scale hopper through the unloading valve is not applicable, nor can it pass through the unloading valve. discharge excess material

Generally, the excess material is taken out through the manual pick-up port on the top of the scale, which causes the temporary stop of automatic production and affects the production efficiency, or the whole weighed material is treated as waste through the discharge valve, resulting in a lot of material waste and environmental pollution.

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