Hydraulic Roller Granulator
Due to its high output, low energy consumption, and superior granule quality, the hydraulic double-roll granulator has become a core piece of equipment in the field of dry granulation. However, given that its structure relies on the coordinated operation of hydraulic, mechanical, and electrical systems, rigorous daily care and maintenance are essential. Mastering proper operating and maintenance procedures, as well as troubleshooting techniques, is key to ensuring the equipment's long-term, efficient, and stable operation.
Structural Breakdown and Component Description
From the perspective of operation and maintenance, the hydraulic twin-roll granulator can be divided into the following modules:
(I) Execution module—Twin-roll assembly: Includes a fixed roll, a movable roll, and die holes on the roll surfaces. The roll shells are replaceable as needed, and the roll gap adjustment offers high precision.
(II) Power module—Hydraulic system: Includes a hydraulic pump station, hydraulic cylinders, piping, and control valve assemblies.
(III) Transmission module: Includes the main motor, gearbox, gears, chains, and belts.
(IV) Feeding module: Includes the feed hopper, metering feeder, and screw pre-compression device.
(V) Control module: Includes the PLC control cabinet and various sensors.
Application Scenarios and Applicable Industries
The hydraulic double-roller granulator is widely used to granulate powdered materials across industries such as fertilizer processing, chemical manufacturing, and environmental solid waste treatment. In fertilizer plants, it processes raw materials like potassium sulfate, potassium chloride, and urea to produce compound fertilizers; in organic fertilizer plants, it handles materials such as dried livestock manure and straw powder. In the chemical sector, it is used to granulate powders like antioxidants and zinc oxide, while in solid waste treatment centers, it converts industrial wastes—such as fly ash and slag—into granules.
Summary of Common Faults
The hydraulic twin-roll granulator is prone to the following malfunctions:
(I) Insufficient hydraulic system pressure: The equipment fails to reach the set pressure. Possible causes include low hydraulic oil levels, a malfunctioning hydraulic pump, or clogged oil lines.
(II) Granules fail to form spheres or cakes: The finished product does not form properly. Possible causes include insufficient material supply, an excessive gap between the rolls, or a gap that is narrow at the ends and wide in the middle.
(III) Circumferential misalignment of mold pockets: The mold pockets on the roll surfaces are misaligned. Possible causes include loose adjustment sleeve bolts or a loose fit between the roll shell and the shaft.
(IV) Abnormal noise: Unusual noise occurs during equipment operation. Possible causes include component wear or poor fit between parts.
(V) Material blockage: Material clogs the feed inlet. Possible causes include a malfunctioning feeding device or uneven material supply.
(VI) Excessive friction between rolls: The equipment cannot operate normally. Possible causes include an improper gap setting between the rolls.
Troubleshooting and Repair Solutions
Solutions for the aforementioned faults are as follows:
Insufficient hydraulic system pressure: Check if the hydraulic oil level is adequate; top up with the same grade of oil if necessary. Check if the hydraulic pump is operating correctly. Inspect oil lines for blockages. If the oil appears cloudy, emulsified, or discolored, replace it immediately. Repair or replace severely worn parts.
Particles failing to form spheres or forming flat cakes: Ensure feed requirements are met. Adjust the gap between the rollers. If the gap is narrower at the ends and wider in the middle, grind down the ends to reduce the gap.
Circumferential misalignment of ball pockets: Align the pockets and tighten the bolts. Replace the roller shells or shafts.
Abnormal noise: Stop the machine immediately for inspection. Check for component wear and fitment issues.
Material blockage: Manually clear the feed inlet. Check the feeding mechanism to ensure uniform material supply.
Excessive friction between rollers: Check if the roller gap is appropriate and adjust it promptly.
