Background technology:

In terms of pest control, phosphine fumigation is currently widely used in China for insecticidal purposes. In order to ensure the fumigation effect, it is necessary to monitor the concentrations of phosphine, carbon dioxide, and oxygen inside the grain silo during the fumigation process. As phosphine is a highly toxic gas, personnel are strictly prohibited from entering the silo during the fumigation process, and gas detection devices are needed to detect the gas situation inside the grain silo. At present, many devices in China have poor flexibility and single functions, which cannot monitor the gas in the grain silo while trapping pests.

(1) During the storage period of grain, if the moisture content exceeds the standard, the moisture inside the grain pile tends to slowly dissociate into the air on the surface and in the gaps between grains. As it is difficult for moisture to escape from the stagnant air, it accumulates between grains and begins to condense when the humidity reaches the saturation point, resulting in fermentation and local temperature rise. This in turn promotes the release of moisture from grains and accelerates the corresponding fermentation process. When the ambient temperature rises, the dust, impurities, especially organic impurities in the grain accelerate the above process, seriously threatening safe grain storage and leading to grain decay. Therefore, the environment of the grain warehouse should be kept ventilated, dry, and clean inside and outside in an orderly manner. Facilities such as rodent, fly, insect, and theft prevention should be adopted in grain depots to prevent the breeding of pests.

(2) Application background of temperature and humidity environment monitoring system for grain warehouse

Since the founding of the People's Republic of China, after more than 60 years of development, China's grain storage technology has made significant progress and has reached a certain level in some fields. However, overall, compared with developed countries, China's grain storage technology still lags behind to a certain extent. At present, most grain warehouses are still manually monitored and managed, such as temperature reduction and ventilation, which is a frequent and laborious operation in daily warehouse management, especially in low-temperature grain storage management. It is often necessary to turn on the machine in the middle of the night: due to the poor stability of grain storage caused by food respiration, maintenance personnel need to constantly flip the grain surface, ventilate, cool down, and disperse moisture. Therefore, the country needs to invest a large amount of manpower. The grain situation and temperature in the grain warehouse rely on manual monitoring, and the custodian needs to conduct frequent inspections, resulting in high work intensity and inaccurate monitoring results.

(3) Monitoring System for Temperature and Humidity Environment in Grain Warehouses

The comprehensive monitoring system for the environment of grain warehouses can comprehensively grasp the temperature and humidity changes inside the warehouses in real time. Once abnormalities are detected, correct measures can be taken in a timely manner to ensure the long-term safe storage of grain. This system adopts advanced microcomputer technology, PLC technology, sensor technology, and automatic control technology in the world, with touch screen display and touch operation. It can automatically monitor the grain situation, temperature, humidity, CO2 concentration, and O2 in the grain warehouse, and can be linked with the heating, cooling, dehumidification, ventilation and other equipment in the grain warehouse to control the operation of heating, cooling, dehumidification, ventilation and other equipment. It can also control the equipment according to manually set values or manually open it as needed to maintain a stable state of grain temperature, moisture, effective concentration and ratio of gas in the warehouse, ensuring the safety of grain storage.