Hydraulic Roller Granulator

As the name implies, the hydraulic roller granulator is a forming machine that utilizes a hydraulic system to generate extrusion force, pressing powdered materials into granules of specific shapes via two counter-rotating rolls. Unlike standard double roller machines that rely on springs or mechanical screws for pressure, the hydraulic system provides more stable and controllable extrusion force, enabling the equipment to easily process hard-to-form materials, such as those that are rigid or fibrous.

This equipment operates via a dry granulation process; it requires no added moisture or binders and eliminates the need for subsequent drying, resulting in a streamlined workflow and significantly reduced overall energy consumption. The finished granules—typically irregular flattened spheres or flakes—exhibit high strength and resistance to pulverization, making them ideal for use as commercial organic fertilizers, compound fertilizers, or specific chemical raw materials.

How does the hydraulic roller granulator work?

Its core operational process can be summarized in three steps: forced feeding, high-pressure extrusion, and demolding/forming.

1. Metering and Forced Feeding

After being metered, the material enters the main unit, where a screw or rotary feeder forces it into the arc-shaped grooves of the two rollers. This step ensures the material is pre-compacted and air is expelled prior to extrusion, preparing it for high-pressure forming.

2. Hydraulic High-Pressure Extrusion

This is the most critical step. The two rollers rotate toward each other; one roller is subjected to immense, constant, and adjustable thrust provided by a hydraulic cylinder. Under linear pressure ranging from several tons to tens of tons, the material is instantly compressed into a dense sheet or forced directly into the grooves (or pockets) on the roller surfaces to form granules. The hydraulic system’s unique "overload protection" feature allows the roller to automatically retract when encountering unbreakable hard objects, preventing damage to the roller surface—an advantage that spring-loaded models cannot match.

3. Demolding and Screening

The formed granules rotate out of the nip zone and are released via gravity or with the aid of a scraper. The discharged material passes through a granulator to break up large chunks, followed by classification via a vibrating screen; qualified granules enter the finished product bin, while fine powder is recycled for re-extrusion.

Which raw materials are suitable for the hydraulic roller granulator?

The hydraulic roller granulator is highly versatile and particularly effective for processing the following types of materials:

Various organic fertilizer raw materials: Such as decomposed livestock and poultry manure (chicken manure, cattle manure), distillers' grains, medicinal residues, mushroom substrate residues, etc. These materials often contain fibers; the hydraulic system provides sufficient pressure to forcibly extrude and shape them, overcoming the challenge of fiber spring-back.

Inorganic minerals and chemical raw materials: Such as potassium fertilizers, phosphate fertilizers, calcium-magnesium-phosphate fertilizers, silicon fertilizers, bentonite, activated carbon, etc. For these materials—which have high specific gravity and are difficult to wet with water—dry extrusion is the most efficient forming method.

Compound and blended fertilizers: Used to produce formulated fertilizers (such as high-nitrogen or high-potassium types) or customized fertilizers enriched with secondary and trace elements.

Specialized materials: Such as the pre-compression and densification of biomass particles (sawdust, straw), as well as the forming of certain pharmaceutical intermediates and catalysts.

Key parameters to note: Material moisture content should generally be controlled between 3% and 8%, and particle size should be reduced to below 10mm via pre-crushing to ensure optimal forming results.

What equipment is required for a hydraulic roller granulation production line?

A single granulator cannot complete the production process on its own; a complete dry extrusion granulation line comprises three main sections—pretreatment, forming, and post-treatment—and the equipment configuration can be streamlined based on the factory's production capacity.

Raw material conveying equipment: Belt conveyors, bucket elevators

Batching and mixing system: Automatic batching system, horizontal mixers

Crushing equipment: Crusher

Core unit: Hydraulic roller granulator

Screening equipment: Drum screener

Finished product packaging: Automatic packaging machine

Why Choose the Huaqiang Hydraulic Roller Granulator?

The choice of the Huaqiang hydraulic roller granulator is underpinned by Huaqiang Heavy Industry’s deep industry expertise and robust comprehensive capabilities. With years of dedication to fertilizer equipment manufacturing, the company operates as an integrated manufacturer—handling R&D, processing, and the delivery of complete system solutions in-house. It maintains standardized production workshops and manufactures core components independently, strictly controlling every production step to eliminate quality risks associated with outsourcing.

Backed by a professional R&D team and practical experience from over a thousand fertilizer production lines, the company continuously upgrades its equipment. The hydraulic double-roller granulator features a mature, stable design optimized through extensive real-world operational testing. Leveraging comprehensive supply chain capabilities, Huaqiang offers one-stop planning for entire organic and compound fertilizer production lines, providing complete technical solutions that cover everything from factory layout and process design to equipment selection.

Unlike standard distributors, Huaqiang Heavy Industry maintains a comprehensive delivery and after-sales system. Services include on-site installation, commissioning, and operator training, alongside a ready stock of genuine spare parts and rapid response to maintenance needs. Numerous fertilizer enterprises——both domestic and international——have long partnered with Huaqiang, cementing its solid market reputation. With strong manufacturing prowess, mature technical expertise, and end-to-end support services, the Huaqiang hydraulic roller granulator is a trusted choice for large-scale granulation projects.