Intelligent drying control system of grain dryer

Abstract

The invention discloses an intelligent drying control system of a grain dryer. The intelligent drying control system comprises a main control module, an A/D conversion module, a data communication module, a protection module, an output control module and a man-machine interaction and display module. Analog quantity signal input and signal A/D conversion can be achieved through the A/D conversion module, and the grain moisture meter transmits moisture signals to the main control module through RS485 communication through the function of the data communication module. Alarm information generated by electrical equipment is transmitted to the main control module through the protection module and transmitted to the man-machine interaction and display module through RS485 communication to display the alarm state, effective control signals are applied to the intermediate relay through a PLC output port through the output control module, and then the heat pump and the grain dryer are controlled to act through the strong current controller. And the man-machine interaction and display module is used for setting drying process parameters and displaying real-time information, so that integrated heat pump grain drying control is realized, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of dryer control systems, in particular to an intelligent drying control system for grain dryers. Background technique [0002] The development of my country's grain dryers has formed the current situation that the north is dominated by continuous large-scale drying towers, and the south is dominated by low-temperature circulating grain dryers. Grain dryers cannot meet the development needs. Scientists at home and abroad try to dry grains in more ways. Various new heat sources have been applied in the field of grain drying, such as heat pump drying, infrared drying, vacuum freeze drying, geothermal energy drying and microwave drying. Drying, etc. Among them, the air source heat pump type grain dryer powered by electric energy has been well promoted in the domestic area. Compared with the oil and coal-fired grain dryer, the one-time purchase and The manufacturing cost is high, but it has the characteristics of ...

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Problems solved by technology

[0002] The development of my country's grain dryers has formed the current situation that the north is dominated by continuous large-scale drying towers, and the south is dominated by low-temperature circulation grain dryers. The traditional oil-fired grain dryers and coal-fired grain dryers that pollute the environment Grain dryers cannot meet the needs of development. Scientists at home and abroad are trying to dry grain in more ways. Various new heat sources have been applied in the field of grain drying, such as heat pump drying, infrared drying, vacuum freeze drying, geothermal energy drying and microwave drying. Drying, etc. Among them, the air source heat pump grain dryer powered by electric energy has been well promoted in the domestic area. Compared with the fuel and coal-fired grain dryers, the one-time purchase and The manufacturing cost is high, but it has the characteristics of high energy utilization rate, low maintenance cost and high safety. Under the premise of long-term use, the new air source heat pump grain dryer has lower cost, energy saving and environmental protection. Due to the requirements of environmental protection, the traditional oil-fired and coal-fired grain dryers will gradually withdraw from the historical stage, and the clean and pollution-free heat pump grain dryers will be promoted in the field of grain drying

[0003] In recent years, the heat pump system has achieved good benefits in grain drying, but at the same time, the problems of heat pump grain dryers have gradually emerged. The existing heat pump grain drying characteristics and drying process equipment are mostly drying boxes. The manufacturer and the dryer manufacturer are mostly two independent manufacturers, resulting in the control systems of the heat pump and the dryer being independent and incompatible with each other, which not only increases the complexity of the drying operation, but also has great safety hazards in the drying process. The degree of controllability and automation is not high, and it cannot be widely used in actual production. Therefore, the present invention proposes an intelligent drying control system for grain dryers to solve the problems existing in the prior art

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