The 5HH series circulating grain dryer is a batch-recirculating grain drying machine developed by Zhengzhou Wangu Machinery Co., Ltd. for concentrated harvests of high-moisture wet grain and small-batch, multi-round drying needs. Its operation follows the line of quantitative loading, closed-loop circulation, repeated airflow penetration and discharge upon reaching target. A batch of grain is quantitatively loaded into the storage chamber at one time, and a lifting mechanism forms a closed circulation loop that repeatedly conveys the grain through the hot-air zone for gentle dehumidification, until the moisture of the whole batch is uniformly on target and the grain is discharged at once. The unit handles paddy rice, wheat, corn, soybean, sorghum, rapeseed and various crop seeds, serving both commercial grain and seed grain drying.

Unlike the 5HSQ series continuous vertical drying tower, the 5HH series adopts a batch-circulation process that emphasizes uniform batch moisture and complete drying in one run. With its compact structure, convenient grain loading and unloading, and flexible single-batch capacity configuration, it is especially suited to urgent batch drying of high-moisture paddy during harvest and to family farms and grassroots grain purchasing points, making it one of the main models for small and medium grain drying scenarios.

 Drying Process

     The 5HH series employs a batch drying process of high-volume low-temperature airflow penetration plus circulating tempering. After the grain is quantitatively loaded into the storage chamber, the bottom discharge mechanism feeds it out evenly, and the bucket elevator returns it to the top where it falls back into the drying section, forming a continuous self-circulation. A high-volume fan sends hot air into the drying section where it penetrates the grain layer vertically; as the grain circulates repeatedly through the hot-air zone, moisture is removed gently and steadily.

       The machine automatically sets the hot-air temperature according to the grain type and initial moisture content, running at a stable low temperature throughout to avoid shell bursting, cracking and scorched kernels caused by high-temperature thermal shock. After each round of airflow penetration, the grain immediately enters the tempering stage, in which moisture migrates and balances between the surface and the interior of the kernels, eliminating moisture gradients and reducing breakage at the source. An online moisture-monitoring system judges the moisture of the whole batch in real time; once the target is reached, the machine automatically stops, alarms, ceases circulation and discharges the qualified grain. The discharged grain is well temperature-controlled and can be bagged and stored directly without secondary sun-drying.

 Structural Composition

·  Storage Chamber: a large-capacity chamber at the top holds a quantitative batch of grain at one time, serving both buffering and circulating-tempering purposes.

·  Through-flow Drying Section: high-volume hot air penetrates the thin grain layer vertically, dehumidifying the whole batch evenly.

·  Closed-loop Recirculation System: linked with the conveyor, the elevator feeds grain out quantitatively at the bottom and returns it evenly to the top, circulating smoothly without spillage or breakage.

·  Screw Discharge Mechanism: evenly distributed bottom screw conveyors discharge grain quantitatively and evenly, ensuring consistent circulation cycles and heating for each batch.

·  High-volume Heating System: heat sources including biomass, coal, natural gas and electric heating are available to suit local energy and environmental conditions.

·  Intelligent Control System: automatic loading, automatic circulation, online moisture monitoring, automatic stop, fault alarms and overload protection support unattended operation.

Core Advantages

Packaging & Warranty

       The equipment is shipped nude-packed with reinforced protection; motors, electrical controls and sensing elements are individually packed and treated against moisture, shock and collision, suitable for long-haul road transport. Customized packaging solutions are available on request. Products are manufactured strictly under the ISO quality management system; each unit undergoes no-load commissioning, loaded drying tests and parameter calibration before leaving the factory. The main frame, drying tower body and transmission system carry a 12-month warranty, supported by lifetime technical consultation, remote guidance, installation and commissioning, troubleshooting and long-term supply of genuine spare parts to ensure stable operation. Minimum order quantity: 1 unit; delivery lead time: 45–60 days.