Which is the best fluidized bed granulation equipment

As a classic equipment in the field of wet granulation, the stable operation of the rotary extrusion granulator depends not only on precise structural design, but also on the scientific selection of equipment materials and standardized operation and maintenance system. In industries such as pharmaceuticals, food, and chemicals that require strict production environments, the corrosion resistance, mechanical strength, and cleaning convenience of equipment directly affect product quality and production efficiency. Meanwhile, reasonable operating procedures and preventive maintenance measures are key to extending equipment lifespan and reducing failure rates.

1、 Equipment Material and Durability: Selection Logic from Basic Components to Core Components

The material selection of the rotary extrusion granulator should take into account the material characteristics, production environment, and mechanical performance requirements. Different components should use targeted materials due to functional differences, forming a multi-level durability guarantee system.

Core components in contact with materialsMaterial selection is of utmost importance, directly affecting product purity and equipment lifespan. The rotating drum and screen in the granulation device are subjected to long-term compression and friction of materials, while also coming into contact with adhesives containing moisture or corrosiveness. Therefore, they are commonly used316L stainless steelThis material contains molybdenum element and has better resistance to pitting and crevice corrosion than ordinary 304 stainless steel. It is particularly suitable for handling materials containing chloride ions (such as saline raw materials in the food industry) or acidic materials (such as organic acid powders in the chemical industry). Its surface has undergone mirror polishing treatment, which not only reduces material adhesion but also lowers the risk of microbial growth, meeting the standards of the pharmaceutical industry. Some special scenarios (such as processing high hardness mineral powders) may useduplex stainless steelBy adjusting the ratio of chromium to nickel, the hardness and wear resistance can be improved.

Transmission and structural componentsEmphasis is placed on mechanical strength and stability. As a key component for transmitting torque, the spindle adopts42CrMo alloy structural steelAfter quenching and tempering treatment, the tensile strength is improved and it can withstand the instantaneous impact load during the granulation process. The gearbox gears are selected20CrMnTi carburizing steelBy precision grinding, the transmission accuracy is ensured and the operating noise is reduced. Rack and other supporting structures are commonly usedQ235B carbon structural steelAfter welding and aging treatment, internal stress is eliminated to ensure the rigidity and stability of the equipment during operation.

Sealing and auxiliary componentsPay attention to adaptability and durability. The sealing components of the material channel are adoptedFood grade silicone rubberorfluororubberSilicone rubber has a temperature resistance range of -60 ℃ to 200 ℃, suitable for conventional granulation scenarios; Fluororubber has excellent chemical corrosion resistance and can withstand organic solvent based adhesives, with a service life of over 800 hours. The agitator shaft seal of the feeding system adoptsmechanical sealandpacking sealCombination design, mechanical seal to prevent material leakage, and packing seal to absorb slight deflection of the shaft, providing dual protection to reduce maintenance frequency.

2、 Operation and Maintenance: Efficient Operation Guarantee under Standardized Processes

The convenience of operation and economic maintenance of rotary extrusion granulators are important reasons for their popularity in industrial production. Through standardized operating procedures and preventive maintenance strategies, it is possible to ensure stable product quality and reduce downtime losses.

operating procedureIt is divided into four stages: pre production preparation, parameter setting, operation monitoring, and post production processing. Standardized operations in each stage are the foundation of efficient production. Pre production preparation requires checking the equipment status: confirming that the screen mesh is securely installed and that the parallelism error between the cutting blade and the screen mesh is less than or equal to 0.05mm/m; Clean the material channel, rinse the contact surface with purified water or specialized cleaning agent, and disinfect if necessary. Parameter settings are based on material characteristics.

During the operation monitoring phase, attention should be paid to three key indicators: current value, particle appearance (no adhesion, no excessive fine powder), and equipment abnormal noise (normal operating noise ≤ 85dB). The operator observes the parameter curve in real-time through the touch screen. When there is a sudden increase in current, the feeding speed should be immediately reduced and the sieve should be checked for blockage; When uneven particle length is found, it is necessary to stop the machine and adjust the position of the cutting blade. Postpartum treatment includes cleaning of residual materials and resetting of equipment: removing screens and cutting knives, using specialized brushes to clean residual particles, and for viscous residues, soaking in 50-60 ℃ hot water and scrubbing can be used; After cleaning, conduct a no-load trial run for 3-5 minutes to confirm that there are no abnormalities in the equipment, and then turn off the power.

Maintain the systemAdopting a graded maintenance strategy, including daily maintenance, regular maintenance, and troubleshooting, to ensure that equipment performance is in ideal condition. Daily maintenance (carried out per shift) includes checking the tightness of each connecting bolt (torque meets the requirements of the instruction manual), cleaning the air filter, and observing the lubricating oil level (the gearbox oil level should be above the centerline of the oil mirror). Regular maintenance is carried out on a periodic basis: check the wear of the mechanical seal every week and measure the leakage rate (should be ≤ 5 drops/minute); Replace the gearbox lubricating oil every month, with an oil volume of about 2/3 of the box volume; Perform temperature rise testing on the spindle bearings every quarter and calibrate the sensor accuracy of the PLC control system.

Quick handling of common faults can reduce downtime. When the particle size deviation exceeds the standard, priority should be given to checking whether the screen mesh is damaged or installed incorrectly. After replacing the screen mesh, trial production verification is required; If the equipment vibrates abnormally, it may be due to spindle imbalance or loose anchor bolts, which can be detected and adjusted by a dynamic balance meter. When tightening the bolts, apply force evenly in a diagonal sequence; When encountering motor overload tripping, check whether the feeding amount is too large or the material hardness is abnormal. If necessary, disassemble the granulation device to remove foreign objects. A spare parts warehouse should be established for vulnerable parts of equipment (such as screens and seals), with a reserve of 3-6 months' consumption. When replacing, the model and installation date should be recorded for easy traceability and management.

translate image

Show original image

translation

Chinese

English

Copy translation

Download image