Double-helix circulating atomized seed coating device and method

A double-helix circulating atomizing seed coating device relates to the technical field of seed coating devices and comprises a coating cylinder, a secondary atomizing mechanism, a double-helix coating mechanism, a feeding pipe, a discharging pipe and a coating parameter control mechanism. The coating machine overcomes the defects of traditional atomization coating and liquid immersion coating, integrates the advantages of the traditional atomization coating and liquid immersion coating, realizes circulating spiral conveying of seeds during atomization coating, not only has a stirring effect, but also exceeds the stirring effect of general immersion coating; during circulating conveying, the distance between the seeds can be adjusted through constant-speed conveying and variable-speed conveying, and the seeds can be fully wrapped by atomized steam and the coating effect is enhanced by adjusting the distance. And finally, through the atomized vapor particles with the set particle size, the probability of atomi