The automatic batching system is used as a central control area to complete the whole process of weighing and feeding. Before the equipment is equipped, the staff will open the switch, and the PLC central control area will send a signal to start the corresponding solenoid valve to inject the material into the reactor. At the same time, the weighing module will start to work. When the amount of the reaction tank is increased to the equivalent of the weight set by the quantitative setting reference, the central control area receives the action signal of the weighing module, and immediately closes the solenoid valve for adding materials and stops adding materials.
020-34563445Automatic dosing system is mainly applied to dry powder and granular products with airflow as the carrier, it is a new technology to convey solid materials with the help of air flow in the sealed pipe. Generally speaking, the airflow is ordinary air, but in some special state dry, cooled, heated air or inert gas such as nitrogen can also be used as conveying airflow. It is used for drying powder and granule products and conveying them with airflow as the carrier. Generally, the air stream is ordinary air, but in some special cases dry, cooled, heated air or inert gases such as nitrogen can also be used as the conveying air stream. According to this basic structure, the product (solid particles) is mixed into the air stream and then carried by the air stream through a certain length of pipe. The pipe is connected to a feeding system or cyclone separator to separate the gas from the product.
Pneumatic conveying includes four components:
1. Source power - a blower, screw fan, compressor, extractor fan or vacuum pump, used to generate the airflow.
2. Feeder-Rotary valves, venturi, screw loaders, ducts, or other feeding devices that add particles to the gas stream under control.
3. Conveyor lines - straight pipes, bends and diverter valves.
4. Separators-cyclones, loaders, filtration, loaders, or silos/ducts that separate the particles from the air stream.
There are two types of airflow Weighing systems:
1. Dilute phase conveying (sparse phase flow)-High air flow rate, low product delivery, low particle content, mass flow ratio of about 0-15, product suspended in the air stream. Negative pressure -0.5 bar to -1.0 bar.
Advantages of airflow weighing and Loading machine:
a Positive pressure air conveying system or air transport system is a blower (such as Roots fan) output airflow as a carrier for bulk powder and granular objects unloaded into the pipeline for pressure feeding, dilute-phase positive-pressure pneumatic weighing and dosing system of positive pressure value of less than 0.15Mpa, gas-solid ratio of 5~20, positive-pressure pneumatic Dosage system capacity up to 60 tons/hour (a single wind transport line) and the conveying distance of up to 400 m. The system is designed to convey the product in the air flow, and the product is suspended in the air flow.
b negative pressure air delivery system or negative pressure air transport delivery system is a vacuum pump (such as Roots or water ring) generated by the vacuum will be bulk powder and granular materials with a negative airflow suction to the designated equipment, negative pressure pneumatic metering Batching system system of negative pressure value of less than 0.06Mpa, gas-solid ratio of 1 to 15, high vacuum pneumatic by the acceptance of tanks, filtration devices and vacuum pumps composed of vacuum pumps will be sucked into the acceptance of tanks, the gas filtered and discharged, the materials fall into the acceptance of tanks, the gas filtered and discharged. The gas is discharged after filtering, and the material falls into the receiving hopper, which belongs to the negative pressure and high concentration pneumatic conveying mode, with the characteristics of long conveying distance (<60m) and gas-solid ratio of 2~8. Negative-pressure pneumatic has the characteristics of continuous and even feeding, and it can be conveyed with the pressure-feeding type of difficult to feed materials such as garbage, wood chips, long and thin fibers, and so on, and it can be realized to be conveyed to a single centralized conveying by a number of places with certain mixing function. At the same time, the capacity of the air conveying system can reach 30t/h (single conveying line).
The concentration of particles in the pipeline relative to the gas is a very important indicator called relative density or mass flow ratio, which is the ratio of the amount of particles to the amount of gas flow. There are many configurations and factors to consider. In order to ensure the design of a correct and efficient conveying system, the choice of accessories is also to send important.
Pneumatic conveying system features:
1. Low maintenance, low labor, low cost - Conveying line closed smooth pipe composition, no mechanical moving parts.
2. Flexible wiring - Compared to belt/screw/chain conveyors, pneumatic conveying piping can be arranged vertically, horizontally, in bends and through tight spaces. Distribution of product to multiple conveying points via diverter valves and extraction of material from multiple supply points can be simpler and easier to realize. Piping can be easily expanded or rewired for future use.
3. Versatility - one dosing system can convey different types of products at different times, virtually all powders and granules can be pneumatically conveyed.
4. Clean internal systems have many benefits: there is no cross contamination when conveying different materials, hazardous and valuable products, health products, food and pharmaceuticals can be conveyed by a sealed control system, and in certain environments where special controls are required, gases can be sealed and circulated through the system.
