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1. How to choose the right type of conveyor for npk organic-inorganic compound fertilizer production line conveying equipment
The selection of conveying equipment for compound fertilizer production line requires comprehensive consideration of material characteristics, conveying distance and production process. For vertical conveying of granular fertilizers, such as NPK fertilizers or high-tower compound fertilizers, bucket elevators are the best choice, with a lifting height of up to 128 meters, high conveying capacity and small footprint. For horizontal conveying of organic fertilizers or semi-finished fertilizers, belt conveyors are commonly used equipment due to their long conveying distance and strong conveying capacity (up to 250 tons/hour). Screw conveyors are suitable for conveying powdered and granular materials, especially for short-distance conveying after drying and cooling. For highly viscous or highly abrasive materials, such as wet organic fertilizers or phosphate rock powder, scraper conveyors perform particularly well, and can reduce equipment loss while maintaining efficient conveying. Reasonable matching of these conveying equipment according to actual needs can effectively improve the overall efficiency and stability of the compound fertilizer production line.
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2. How to improve the operating efficiency and service life of bucket elevators
To improve the operating efficiency and service life of the bucket elevator, we need to start from two aspects: design and daily maintenance. First, regular inspections of chains, hoppers and tensioners and gearboxes are key. It is recommended to inspect key components once a week and replace damaged components promptly if problems are found. At the same time, providing high-quality high-temperature resistant lubricating oil for moving parts such as chains and bearings can significantly reduce friction losses. In addition, during the design stage, the hopper spacing needs to be reasonably optimized, usually controlled between 500-600 mm, to ensure sufficient charging and reduce backflow. The overload protection device is also an integral part and can automatically stop the equipment when it is overloaded. Through the above measures, the service life of the bucket elevator can be extended to 5-7 years, and its operating efficiency can also be improved by more than 15%.
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3. What are the common faults and solutions of bucket elevators?
Bucket elevators are widely used in compound fertilizer production lines to transport materials vertically, but in actual operation, they often encounter problems such as bucket shedding, chain breakage and material reflux. Bucket shedding is usually caused by overload operation or loosening of fixing bolts. For this reason, it is necessary to regularly check the installation of the bucket and ensure that the bolts are tightened. In the case of chain breakage, it is mostly related to poor chain material or overload operation. It is recommended to use high-strength alloy chains with a tensile strength of more than 1000 MPa and perform regular lubrication and maintenance to reduce the risk of damage. In addition, the problem of material reflux is mainly related to the mismatch between the elevator speed and the bucket spacing. The reflux phenomenon can be reduced by optimizing the bucket design and matching the lifting speed and spacing.
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4. How to prevent belt conveyor from deviation and material scattering
Due to the long conveying distance or uneven load, the belt conveyor in the compound fertilizer plant often deviates and spreads materials. In order to prevent deviation, the height of the rollers on both sides of the conveyor needs to be adjusted to ensure smooth operation of the belt. If the conveyor length exceeds 50 meters, an automatic tensioning device can be installed to maintain uniform belt tension. In addition, installing anti-deflection baffles or dust covers on both sides of the conveyor is also an effective protective measure. The problem of material scattering is related to the design of the guide trough and the belt speed. Optimizing the structure of the guide trough and ensuring its fit can significantly reduce material scattering; the conveying speed is controlled between 2.5-4.0 m/s, which can ensure the transportation Efficiency can also reduce the possibility of spillage.
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5. What are the advantages of scraper conveyors in compound fertilizer production lines?
Scraper conveyors are widely used in compound fertilizer production lines for their excellent wear resistance and high temperature adaptability. The chain is made of high-strength alloy steel with excellent wear resistance. It is especially suitable for conveying highly abrasive materials such as phosphate rock powder. The service life of the chain can reach more than two years. In addition, the scraper conveyor can withstand high temperatures above 200°C and is an ideal choice for conveying hot materials in the drying section. When facing wet or sticky materials, such as wet fertilizer slurry, the structural design of the scraper can effectively clean up the residue and avoid material accumulation and blockage. The compact structure and strong adaptability of the scraper conveyor have been very popular in compound fertilizer plants in recent years. At the same time, the use of scraper conveyors can effectively reduce dust during transportation and achieve fully enclosed transportation, which is also very attractive for the HSE (health safety environment) of modern compound fertilizer enterprises.
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6. What types of materials are suitable for screw conveyors?
Screw conveyors are widely used in compound fertilizer production lines due to their simple structure and good sealing performance. In compound fertilizer lines, they are mostly used for dust recovery under the dust collector and anti-caking agent delivery at the feeding port of the coating machine. It is especially suitable for conveying powdered, granular and wet materials. For powdered materials such as organic fertilizer powder and urea powder, the closed design of the screw conveyor can effectively prevent dust leakage, and its conveying capacity can reach 50 tons per hour; during the conveying process of materials such as granular compound fertilizer and potash fertilizer granules, the spiral blades can ensure uniform conveying, and the breakage rate is less than 1%, which can well protect the material form. For wet or sticky materials, such as organic fertilizer slurry or wet sludge, the double helix structure can effectively avoid blockage problems. However, it should be noted that the screw conveyor is less efficient when conveying over long distances, so it is recommended to be used for short-distance conveying, usually not more than 30 meters.
