Negative pressure monitoring system and negative pressure monitoring method for powder measurement

Abstract

The invention discloses a negative pressure monitoring system and a negative pressure monitoring method for powder measurement, used for measuring powder with a powder measuring device in a concrete stirring station. The negative pressure monitoring method comprises the following steps of: giving a negative pressure tolerance value of a powder measuring hopper; acquiring the intensity of pressurein the powder measuring hopper and the intensity of pressure in a stirring main machine and calculating the negative pressure of the powder measuring hopper according to the acquired intensities of pressure in the powder measuring hopper and the stirring main machine; and judging whether the negative pressure is in the negative pressure tolerance value range or not, permitting to measure when thenegative pressure is in the negative pressure tolerance value range or else adopting a corresponding measuring solution. According to the method of the invention, online monitoring is carried out on abnormal conditions of the negative pressure during powder measurement, and the tolerance value of the negative pressure is limited so that powder is smartly measured in selected time on the basis to avoid a negative pressure peak, and the influence of the negative pressure on the powder measurement is lessened. In addition, the invention also provides the data in the full process for plants and users to refer.

Description

technical field [0001] The invention relates to a powder metering negative pressure monitoring system used in a powder metering device of a concrete mixing station, and also relates to a negative pressure monitoring method used for powder metering of a concrete mixing station. Background technique [0002] At present, the powder metering device of the concrete mixing plant usually includes a powder metering hopper supported by a weighing device. A pneumatic butterfly valve is installed at the lower end of the powder metering hopper. The upper end of the bucket is connected with the discharge port of the screw conveyor through a rubber hose. When the powder metering hopper is in the process of powder metering and powder discharge, it will generate negative pressure, which will affect the accuracy of powder metering, and have a potential impact on the accuracy of powder dosage in the enterprise and the quality of concrete. [0003] When the mixing station adopts bag-type dust...

AI Technical Summary

Problems solved by technology

When the powder metering hopper is in the process of powder metering and powder discharge, it will generate negative pressure, which will affect the accuracy of powder metering, and have a potential impact on the accuracy of powder dosage in the enterprise and the quality of concrete.

[0003] When the mixing station adopts bag-type dust removal or box-type dust removal system, the upper end of the powder metering hopper can be directly connected with the bag or dust collection box, and the pressure release and supplementary functions can be realized through the space of the bag or dust collection box. Or the volume of the dust removal box is limited, the air pressure cannot be released and replenished quickly in a short period of time, and there is still a large measurement deviation in powder measurement

[0004] In addition, the connecting pipe can be used to connect the powder weighing hopper with the mixing main machine to achieve the effect of balancing the pressure in the mixing main machine and the powder weighing hopper. Balanced, the cross-sectional area of ​​the upper and lower ends is different, and the connecting pipe is easy to block, so there will still be a large measurement deviation

[0005] At present, manufacturers of concrete mixing plants and concrete production enterprises have not paid enough attention to the influence of negative pressure on powder metering.

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