Two-way variable air volume ventilation temperature control and humidification system for granary

A gas mixing box comprises an upper air chamber, a lower air chamber and a horizontal partition plate arranged between the upper air chamber and the lower air chamber, a bidirectional ventilator is arranged in a ventilator mounting hole in the horizontal partition plate, and an air inlet box door is arranged outside an air inlet in the side wall of the upper air chamber. One end of the ventilationpipe is communicated with the ventilation pipe connector on the top wall of the upper air chamber, the other end of the ventilation pipe extends into the upper space of the granary through the side wall of the granary, and an air outlet on the side wall of the lower air chamber is connected with the air inlet end of the ventilation channel in the granary; one end of the temperature and humidity detection cable is connected with the measurement and control device, and the other end extends into the granary through the side wall of the granary and vertically enters the grain pile; and the humidifier mist outlet pipe is