Pneumatic powder conveying equipment
? Pneumatic powder conveying equipmentIn a broad sense, it is a device that uses airflow to transport powder from front to back in a pipeline; Narrowly defined, it refers to the equipment in the powder conveying pipeline section.
? Pneumatic powder conveying equipment is one of the fluid pneumatic conveying methods, which uses airflow to transport powder particles in pipelines, also known as pipeline pneumatic conveying. Due to its high conveying efficiency, simple equipment structure, convenient maintenance and management, easy implementation of automation, and environmental protection advantages; Especially when used for internal transportation in factory workshops, the transportation process can be combined with the production process, which helps simplify the process and equipment, thus greatly improving labor productivity and reducing costs.
? In a broad sense, for pneumatic conveying powder equipment, it is necessary to first explain the types of pneumatic conveying systems, as different types require different equipment; The types of pneumatic conveying are divided into negative pressure pneumatic conveying and positive pressure pneumatic conveying according to the pressure state of air in the middle. In addition, there are positive negative mixed pneumatic conveying and closed cycle pneumatic conveying. Negative pressure pneumatic conveying of powder can be divided into mobile and fixed types. The equipment for the general system structure includes feeders, pipelines, unloaders, air closers, dust collectors, and fans. The specific type, model, material, and other equipment to be used need to be determined based on the characteristics and conveying volume of the material being conveyed by the customer; The working principle of the negative pressure pneumatic conveying system is that the air source equipment is installed at the end of the conveying system. When the fan is running, the entire system forms negative pressure, which is sucked into the conveying pipe by the pressure difference between the inside and outside of the pipeline; At the same time, the material and a portion of the air are simultaneously sucked in by the suction nozzle and transported to the separator for material and air separation. The separated material is discharged from the bottom unloader of the separator, while the unseparated fine particles enter the bag filter for purification with the airflow, and the purified air is discharged into the atmosphere.
? Positive pressure pneumatic conveying powder equipment, which is divided into low pressure and high pressure; The overall system consists of equipment such as gas source, feeder (rotary feeder, bin pump, screw conveyor, etc.), silo, unloader, conveying pipeline, separator, bag filter, etc; Similarly, regardless of the type, model, material, or other equipment used, the design should be based on the characteristics, conveying volume, distance, and other factors of the materials being transported by the customer; Its working principle is that the air source equipment is located at the front end of the system. When the conveyed material is compressed to the conveying destination, the material is separated in the separator or storage bin and discharged through the unloader, while the air is purified by the dust collector and discharged into the atmosphere; The positive pressure pneumatic conveying air source equipment is located at the front end of the system, and materials cannot enter the conveying pipe freely and smoothly. A sealed feeding device must be used. There is another type of positive negative pressure mixed pneumatic conveying powder equipment that combines the above types of equipment, which combines the characteristics of negative pressure and positive pressure conveying equipment, and can be pressed from most suction materials to distant discharge points. The last type of cyclic conveying, which is inert pneumatic conveying, consists of equipment such as feeders, conveying pipelines, unloaders, air closers, dust collectors, fans, return air ducts, etc. It is often discussed which model, material, and other equipment to use, and technical personnel need to design the material characteristics, conveying capacity, conveying distance, etc; This type is suitable for pneumatic conveying of small, valuable, or hazardous powders.
? ?After speaking broadly, let's talk about a narrow understanding, which refers to the equipment or accessories in the powder pneumatic conveying pipeline section; There are two types of pipelines used in pneumatic conveying: material conveying pipelines, also known as conveying pipes, and air ducts. Pneumatic powder conveying equipment is mainly used for conveying materials. According to process requirements and characteristics, it generally consists of straight material conveying pipelines (straight pipes, telescopic pipes, etc.) and turning material conveying pipelines (flexible pipes, bent pipes); In addition, when there are collection pipes or branching pipelines, branch valves, pipe connections, etc. need to be installed; Pneumatic powder conveying equipment should have sufficient strength and rigidity, good air tightness and wear resistance, smooth inner wall surface, and good coaxiality of detachable pipe sections for easy cleaning, blockage removal, and quick disassembly. As for air ducts, they are used to transport pure air or other gases, or to transport gases with a dust concentration of less than 10%.