The company’s technology director shared insights into the new model of the fluidized bed jet mill, highlighting several key innovations that significantly enhance its performance and efficiency. One of the major improvements is the transformation of the crushing area from a flat to a three-dimensional structure. This design expansion greatly increases the effective crushing space within the fluidized bed, allowing for more frequent collisions, friction, and compression between particles, which ultimately improves the grinding efficiency.
Additionally, the upward nozzles are strategically placed beneath the conical bottom of the crushing chamber. This ensures that any material falling into the cone is immediately subjected to high-speed air jets, eliminating the previously existing dead zones. As a result, the entire system—from the feeding chamber at the bottom to the classification chamber at the top—operates in a fully fluidized state under the influence of the jet gas flow. The material is rapidly directed into a conical shape and crushed almost instantly by the combined action of multiple nozzles.
Beyond the nozzle configuration, the new model also introduces an advanced sealing mechanism. Unlike traditional systems that rely on dynamic/static ring seals or labyrinth seals, this model uses a closed-air sealing method without any moving parts. This not only prevents wear and tear but also enhances the smooth and safe operation of the equipment over extended periods.
The technical director emphasized that the new model meets all GMP (Good Manufacturing Practice) standards. From material selection to structural design, every aspect adheres to strict hygiene and safety requirements. The main unit is connected using flanges, hinge bolts, and quick clamps, making disassembly and cleaning (CIP/SIP) more convenient. Bearings are equipped with multiple sealing devices and special lubricants, ensuring stable operation even at high speeds. The internal and external surfaces are polished to a roughness of 0.4–0.8 microns, ensuring cleanliness and product safety. The control system uses a PLC (Programmable Logic Controller), enabling intuitive panel-based operation that simplifies tasks and reduces labor intensity while promoting a more user-friendly design.
In terms of production control, the company has accumulated extensive practical experience in developing and operating fluidized bed ultrafine crushers. Technicians stress the importance of following strict operational guidelines when selecting and using the new model:
1. **Feed rate control**: Maintaining the right material concentration is crucial. Too low or too high a concentration can affect airflow velocity and grinding efficiency. Depending on pressure, material properties, and other factors, screw feeders, oscillating feeders, or star feeders can be used to ensure a steady supply of material to the crushing chamber.
2. **Optimize grading structure**: Efficient classification is essential for ultrafine grinding. The fluidized bed crusher allows continuous feeding and discharge, preventing over-grinding and unnecessary energy use. Adjusting the classifier wheel diameter, increasing speed, and reducing airflow can help achieve finer particle separation.
3. **Pre-pulverization**: To maximize efficiency, raw materials should be pre-processed using a conventional mechanical grinder before ultrafine grinding. This step is one of the most effective ways to save energy and boost production capacity.
4. **Ensure system airtightness**: All components, including pipes, valves, and equipment jackets, must be completely sealed to prevent leaks. This ensures that aerodynamic energy is focused on the nozzles, maintaining optimal gas flow and pressure for better particle impact.
5. **Efficient product collection**: The dust collection system must allow for smooth airflow without excessive resistance. It should effectively collect qualified products while meeting environmental standards, without complicating the overall system unnecessarily.
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