A solar greenhouse roof intelligent ventilation system and its control method

Abstract

The invention relates to an intelligent ventilation system on the roof of a solar greenhouse and a control method thereof, comprising a scissor type ventilation device, a vent sealing device and an intelligent control system; the scissor type ventilation device includes a fixed bracket, a scissor frame, and a vent push rod motor , limit slide rail, limit pulley, micro switch and film fixing groove; vent sealing device includes drive rod push rod motor, drive shaft, limit bearing, seal rod, drive rod and scissor drive; intelligent control The system includes temperature sensor, raindrop sensor, touch screen, PLC and adaptive power supply. The present invention can be based on the different temperature requirements of different crops and different growth periods, no longer judge whether ventilation is based on a simple temperature threshold, but based on the environmental data collected by the PLC according to the temperature and raindrop sensor, and comprehensively consider the crop growth period Whether the effective accumulated temperature reaches the preset lower limit, whether there is precipitation, the instantaneous temperature increase or decrease and other factors, control the movement of the vent push rod motor and the transmission rod push rod motor, so as to control the opening, closing and sealing of the vent.

Description

technical field [0001] The invention relates to a solar greenhouse roof intelligent ventilation system and a control method and the control method thereof, belonging to the field of facility agricultural production and mechanical automatic control, and is suitable for the roof ventilation management of solar greenhouses. Background technique [0002] my country's facility cultivation area ranks first in the world, but compared with developed countries, my 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 for controlling the temperature and humidity conditions of the solar greenhouse, the top vent of the solar greenhouse has not been fundamentally improved and developed due to the limitation of the solar greenhouse structure. The existing complete solar greenhouse film is generally divided into three parts, the top one is the top vent film, the middle on...

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

Images