The dry rolling granulator adopts dry extrusion technology to compress powdered materials with a moisture content of less than 10% into flakes, and then goes through crushing, granulation, and screening processes to turn the flake like materials into granular materials that meet the requirements for use. Dry rolling granulation mainly relies on external pressure to force the material through the gap between two opposing rotating rollers, compressing it into sheets. During the rolling process, the actual density of the material can increase by 1.5-3 times, thereby achieving a certain strength requirement.
The working principle of dry rolling granulator:
Various dry powder materials are fed into the bucket elevator through the feeding port via a screw conveyor. The bucket elevator sends the raw material powder into the vibrating raw material bin, and the material is fed into the variable frequency screw feeder through a quantitative feeding machine for pre compression. The pre compressed material is pressed between two pairs of relatively rotating pressure rollers for compaction. The pressing force is transmitted to the material through the pushing force of the oil cylinder by the pressure rollers. The compacted sheet-like material is automatically removed from the tank and enters the crusher, where it is crushed into unevenly sized particles, and then enters the granulator for trimming. The trimmed particles are squeezed out through a sieve plate with mesh holes and enter the screening machine. The finished particles are sieved and then sent to the finished product warehouse through a bucket elevator. The screened powdered material is returned to the raw material bin through a screw conveyor and compacted again to complete a closed cycle. The magnitude of the squeezing force can be adjusted by the pressure of the hydraulic cylinder according to the needs of the granulation operation. By changing the groove form of the roller surface We can obtain sheet-like, strip-shaped, and flattened spherical materials.
Characteristics of dry rolling granulator:
1. The material is mechanically compressed and formed without the addition of any wetting agent, ensuring the purity of the product.
2. Directly producing dry powder without the need for subsequent drying processes is more conducive to the connection and transformation of existing production processes.
3. The particle strength is high, and the increase in bulk density is more significant than other granulation methods. Especially suitable for increasing the density of product stacking.
4. It can control environmental pollution, reduce powder waste and packaging costs, and improve product transportation capacity.
5. Compact structure, easy maintenance, simple operation, short process flow, low energy consumption, high efficiency, low failure rate, suitable for a wide range of raw materials, and roller pressure can be freely adjusted according to different materials.
6. The feeding and feeding device adopts variable frequency stepless adjustment control, with high degree of automation, capable of controlling multiple machines by one person, low labor intensity, and long-term continuous operation.
7. The main transmission components are made of high-quality alloy materials, stainless steel materials, titanium materials, chromium and other surface alloys, greatly improving wear resistance, corrosion resistance, high temperature resistance and pressure resistance, making the machine have a longer service life.