Grain bin pressure sensing system and grain bin reserve online monitoring and early warning system

Abstract

The invention relates to a grain bin reserve online monitoring and early warning system and a grain bin pressure sensing system. The pressure sensing system comprises a plurality of pressure sensors distributed on the bottom of a grain bin at intervals; each pressure sensor is provided with an output cable; and after vertically reaching a side wall of the grain bin, each output cable is connected with an almost-annular wall attached cable by means of an RS485 bus, then penetrates the side wall, and is connected with a data collection and transmission device outside the grain bin. The online monitoring and early warning system comprises a grain bin pressure sensing system, a data collection and transmission device and a data processing system, wherein the data collection and transmission device communicates with each pressure sensor of the grain bin pressure sensing system through an RS485 bus and a customized protocol. Based on the digital output pressure sensors, the online monitoring and early warning system can detect the current weight of a grain reserve inside the grain bin in real time and upload the data to a monitoring center, and nationwide interconnection is realized, so that dynamic supervision and early warning of all grain reserve depots can be realized.

Description

technical field [0001] The invention relates to the field of real-time on-line detection of grain reserves in granaries, in particular to an on-line monitoring and early warning system for national grain reserves and a pressure sensing system thereof. Background technique [0002] Food security is the foundation of the national economy and the guarantee of social stability. Food security includes quality security and quantity security. At present, obtaining the quantity of national grain reserves depends on organizing a large-scale "clearance of warehouses" across the country, which is mainly for sampling statistics and calculations, which not only consumes a lot of manpower, material resources and funds, but also has a long statistical period (usually three months) ), the accuracy is insufficient. Since manual monitoring measures are difficult to achieve real-time supervision, acts of favoritism and fraud by grain distribution companies have been reported from time to tim...

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Problems solved by technology

[0006] In the prior art, although there are special pressure sensors for online detection of grain storage volume, such as the Chinese utility model patent "A pressure sensor for detecting grain storage volume" with application number 201020143589.8, which can accurately measure the internal stress of grain granules, however, Its output is analog signal, which has deficiencies in product cost, pressure calibration and signal transmission mode, and it is inconvenient for data collection and transmission, and it is also inconvenient for construction and installation

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