What are the development directions of supersonic jet mills?
At present, the development trend of powder granulation technology is toward the direction of large-scale equipment, compact structure, high-tech processing technology, diversified functions, high efficiency, and automation of control systems.
- Large-scale equipment
With the advancement of science and technology and the development of technology, the advantages of large-scale production equipment have become more and more obvious. At the same time, the application of CAD/CAM technology and precise stress analysis technology has promoted the development of mechanical structure design and processing and manufacturing technology. The large-scale granulation equipment provides a solid technical guarantee. At present, the powder granulation equipment is developing in the direction of large-scale, and the single-machine processing capacity of the super-large screw extruder can reach 25-30t/h. Taking the screw granulator as an example, the maximum screw diameter of the existing equipment is 240mm, and the single machine processing capacity exceeds 2t/h. A super-large screw granulator with a screw diameter of 380mm and a single machine processing capacity of more than 4t/h is under development; a rotary cold belt drop molding device, the width of the condensed steel belt under development is more than 1.5m, the equipment length exceeds 20m, and the single machine processing capacity More than 6t/h.
- Compact structure
Another development trend of jet milling equipment is compact structure. The structural design of the equipment is more reasonable, more compact, and more ergonomic, thereby reducing manufacturing costs, reducing floor space and improving labor efficiency. Take the screw granulator as an example, the direct connection of the motor replaces the traditional belt drive, making the equipment more compact and the transmission torque is greater; the variable pitch design is adopted, and the material conveying section, kneading and extrusion section are designed on one shaft , So that the conveying, kneading, and granulation can be completed at one time. These design concepts all represent the development direction of powder granulation equipment.
- High-tech processing technology
With the expansion of the application field of powder granulation equipment, traditional mechanical processing methods can no longer meet the needs of powder design technology. In the future, the processing technology of powder equipment will develop in the direction of high technology. For example, computer-aided design/manufacturing (CAD/CAM) technology is used to design and process the screw thread profile, special deep hole processing equipment is used to process the slender hole of the cold belt die distributor, and the five-axis CNC bed is used to realize the space twisting blade Profile processing, using plasma cutting machine, laser, EDM to process small aperture templates, using nano technology (nanometer coating) to process extrusion screws and rotating steel belts to solve material holding rods, product demoulding, etc.
- Diversified functions
The powder post-processing project is a system project that includes many unit operations in multiple disciplines and categories. It is required that the selection of powder granulation equipment should reduce the intermediate steps to save investment; at the same time, the market demand for products also requires production Manufacturers can provide products in various forms. This requires diversification of the functions of powder granulation equipment. Take the special extruder pelletizer for catalyst as an example. Based on the ordinary single-screw pelletizer, this machine has been specially designed and improved. It consists of two parts, extrusion and pelletizing, which can complete the extrusion and pelletizing in one machine. At the same time, by replacing the die template, granular products of different particle sizes and shapes can be obtained; the rotary belt molding device can realize hemispherical, flake, block, and stripe shapes by replacing parts such as distributors and overflow weirs. The production of products with different shapes, such as the shape, greatly facilitates users and truly realizes the diversification of functions.
- Efficiency and efficiency
With the improvement of people’s awareness of energy saving, higher requirements are put forward for the efficiency of powder granulation equipment. This type of equipment is required not only to meet functional requirements, but also to be energy-saving, durable, and low in use, maintenance, and repair costs to reduce product costs. Take the crushing granulator as an example. If a traditional electromagnetic speed-regulating motor is used and an ordinary speed regulator is used to regulate the speed, the motor power needs to be 45kW. If the frequency conversion speed motor is used and the frequency converter is used to adjust the speed, it can save energy by more than 30% in actual use; the dual-axis differential continuous kneader, due to the specially designed high-efficiency kneading element, has an operating time compared with ordinary screw kneaders. Cut it in half and more than double the efficiency. The adoption of these technologies indicates that high efficiency has become one of the main goals pursued in the design of powder granulation equipment.
- Control system automation
With the advancement of science and technology and the development of automatic control technology, whether to adopt assembly line operation and automatic control has become an important indicator to measure the advancement of powder post-processing technology. The control system adopts automatic control, which can not only ensure the flow of the production process and reduce the labor intensity of the operators, but more importantly, it can ensure the accuracy and real-time feedback of the production process, improve product quality, and reduce equipment failure rate. Taking the rotary belt molding device as an example, if the computer DCS distributed control system is adopted, not only can the automatic operation of feeding, granulating, conveying, packaging and other processes be realized, but also through various temperature, pressure, flow, speed and other sensors, real-time Monitor system status. When the system status and process parameters change, timely feedback the changes, send out an alarm signal, and adjust the parameters according to the preset status to automatically adjust the system status to ensure the normal operation of the equipment. It is foreseeable that the automation of the control system will greatly improve the technical level of the powder granulator equipment and become the inevitable direction of the development of powder granulation equipment.