In fertilizer production process, rollers of this compound fertilizer granulating machine are with less coefficient of friction, low temperature,

There is 2 types double roller granulator machine in our factory:roll extrusion granulator and flat die extrusion granulator. At ordinary temperatures, roll extrusion granulator can directly press powder materials into fertilizer granules. It can not only produce complex fertilizer, such as urea, ammonium chloride, ammophos complex fertilizer, NPK compound fertilizer and so on, but the roller extrusion granulator is suitable for compound fertilizer, for example magnetic fertilizers and rare earth fertilizer.
In fertilizer production process, rollers of this compound fertilizer granulating machine are with less coefficient of friction, low temperature, and low energy consumption.
Dry powder (8% moisture content) is extruded and granulated by roll extrusion fertilizer granulation machine which adopts dry extrusion technology, making materials be standard fertilizer granules. After being extruded by two rollers, raw materials, space between which are squeezed to minimum value, become caky ones. The density of materials are multiplied several times.

Working Process of Roller Extrusion Fertilizer Granulator
The work of this compound fertilizer granulating machine can be divided into 2 parts: Extrusion and Granulation.
Extrusion: dry materials are condensed into hard and dense caky ones under pressure. This process
use inter-molecular force principle.
Granulation: caky materials are granulated into compound fertilizer granules by rollers. Space between rollers is adjustable, keeping 0.3-1mm distance usually. The utilization rate of raw material can reach 87%.

Structure of Double Mode Fertilizer Pellet Mill
Double mode fertilizer granulation machine includes Control System, Granulator, and Feeder.
1. Feeder, consisting of hopper, PID controlled spiral auger, and frequency conversion motor, is installed above Granulator. PID controlled spiral auger is driven by frequency conversion motor, one side of which connects with the feeder, there is being discharge hole on the other side.

2. The fetilizer granule making machine consists of main motor, reducer, coercion conveyor screw auger, radial roller, axial roller, annular die and flat die.
● The output shaft of main motor connects with reducer whose output shaft links with the main spindle of coercion conveyor screw auger by couplings.
● Top of one side of the coercion conveyor screw auger has feed inlet connecting with the discharging hole of the feeder. On the other side, there are radial roller and axial roller being installed orthogonally on the main spindle.
● Annular die and flat die, on the lateral border of radial roller and axial roller, are fixed on the frame of the fertilizer granulator machine.
● There are discharging holes on the dies. A discharging port is set below the dies.
3.Control systems consists of current transformer, intelligent ammeter, frequency converter, and external power supply.
● Output of carry current of granulator main motor is through current transformer whose current signal output end connects with the current transmitter signal input end of intelligent ammeter.
Transmitter signal output end of intelligent ammeter connects with transmitter input end of frequency converter whose power output end connects with source input pin of frequency converter. Inverter and main motor of the fertilizer granulator part connects with external power supply.