Description

Grain enters the upper hopper, where an auger evenly fills the columns in turn. The columns form a jacket around the shaft into which hot air is forced. When all columns are full, the grain loading auger switches off automatically. The inner and outer walls of the columns are made as perforated screens, which allows the grain layer (36 cm) to be blown through effectively while maintaining the temperature set by the operator. At the bottom of the dryer there are metering rollers whose rotation speed controls how long the grain stays in the columns; this is what provides the different drying modes. The metering rollers feed the dried grain onto the lower unloading auger, which carries it to the conveying systems for further transfer to transport or storage.

The outer and inner screens of the grain columns are made of grade 430 stainless steel, 0.8 mm thick, which significantly extends the service life of the unit. The standard dryer comes with screens with 2.5 mm perforation. When the perforation is reduced (for drying rapeseed and seeds), the total perforation area stays the same, so cereals and rapeseed can be dried without changing the screens. The load-bearing chassis is made of a single galvanized frame, which gives the dryer a rigid structure and balanced auger operation. The standard dryer is supplied with support legs. The metering rollers are made of hot-drawn aluminium and are resistant to impact and breakage. The lower auger housing is 2 mm thick. The auger pulley mounting system is improved: the bushings are easily fitted to the shaft, the pulley is then slipped onto them, secured with two clamping bolts and removed with a single jacking bolt. A reinforced cross member prevents deformation of the dryer and auger vibration. The reinforced chassis lets the dryer operate for many years without deformation of the housing or moving parts.

The grain loading auger of the dryer is switched on from the dryer control panel and switches off automatically when the upper grain level sensor in the dryer is triggered. A grain loading elevator can also be connected to this automation. Grain unloading. Unloading starts automatically when the grain reaches a set temperature. When the temperature set by the operator is reached, the lower unloading auger and the metering rollers that determine the unloading speed switch on automatically. A frequency converter lets you adjust the grain flow speed and reach a continuous flow mode. If the grain temperature falls more than 2 °C below the value set by the operator, the automation stops unloading to prevent under-dried grain from leaving the dryer. When the set grain temperature is reached again, unloading restarts automatically. Cooling fan. According to grain drying standards, the temperature of the grain leaving the dryer should not exceed ambient temperature by more than 10 °C. The operator sets the required grain temperature in the lower cooling chamber; when it is reached, the automation switches off the cooling fan, and switches it on again when the value rises by 5 °C. Equipment: grain loading auger, grain unloading auger, hot-drawn aluminium rollers, electric motors of the loading and unloading augers, gear motor of the metering rollers, fan motor, Multi-Wing fan, outer and inner screens of the grain columns made of grade 430 stainless steel, control panel with Schneider Electric automation and a frequency converter for adjusting roller speed.