Solar greenhouse roof intelligent ventilation system and control method thereof

Abstract

The invention relates to a solar greenhouse roof intelligent ventilation system and a control method thereof. The solar greenhouse roof intelligent ventilation system comprises a scissor fork type ventilation device, a ventilation opening sealing device and an intelligent control system. The scissor fork type ventilation device comprises a fixing support, a scissor fork frame, a ventilation opening push rod motor, a limiting sliding rail, a limiting pulley, a microswitch and a film fixing groove; the ventilation opening sealing device comprises a transfer rod push rod motor, a transmission shaft, a limiting bearing, a sealing rod, a transfer rod and a scissor fork type transmitter; the intelligent control system comprises a temperature sensor, a raindrop sensor, a touch screen, a PLC and a power adapter. On the basis of different requirements for temperature of different crops at different growth periods, whether ventilation is performed or not is judged not depending on a simple temperature threshold value; on the basis of environment data collected by the PLC according to the temperature and raindrop sensors, whether or not the effective accumulative temperature reaches the preset lower limit within the crop growth periods and whether it rains or not, the increase and decrease amplitude of the transient temperature and other factors are comprehensively considered, movement of the ventilation opening push rod motor and the transfer rod push rod motor is controlled, and therefore opening and closing of a ventilation opening are controlled.

Description

technical field [0001] The invention relates to an intelligent ventilation system on the top of a solar greenhouse and a control method thereof, belonging to the field of facility agricultural production and mechanical automatic control, and is suitable for ventilation management on the top of a solar greenhouse. Background technique [0002] my country's protected cultivation area ranks first in the world, but compared with developed countries, our country's facilities are simple in type and backward in facilities and equipment, which cannot meet the needs of facility environment regulation. [0003] As the core device to control the temperature, temperature and humidity of the sun, the top vent of the solar greenhouse has not been fundamentally improved and developed due to the limitation of the structure of the solar greenhouse. The existing complete solar greenhouse film is generally divided into three parts, the top one is the top vent film, the middle one is the daylig...

AI Technical Summary

Problems solved by technology

[0005] The solar greenhouse is oriented east-west, with solar radiation as the direct heat source, but the change of the position of the sun in a day will inevitably cause the uneven distribution of heat in the solar greenhouse. The traditional ventilation method ignores this difference, and whether to ventilate and when to ventilate depends on Artificial experience, or simply setting the temperature threshold to judge, these operating methods obviously ignore the different temperature requirements of different crops in different growth stages, so it is imperative to adopt a segmented and intelligent management method for the temperature in the solar greenhouse

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