The variable frequency dosing machine and the equal pressure mixer, weighing system and new conveying pump constitute the dosing system. The weighing module is installed under the powder bin and its function is to feed the metering device. The powder enters through the dosing feeder and adjusts the speed of the dosing feeder according to the comparison result of the instantaneous flow measurement value and the set value, so that the instantaneous value always tracks the set value, so as to realize the measurement and control of the feeding amount. The measured powder enters the powder conveying pipeline through the new conveying pump.

Speed dosing machine through the touch screen to complete the field dosing control and formula weight collection, the field operator only need to carry out the necessary manual intervention, you can complete the entire production, avoid human error, but also improve the production efficiency. With rich functions such as production monitoring, recipe management, batch statistics, alarm prompt and report printing, it is very suitable for real-time, multi-task control. Through the supporting communication interface, the relevant production information can also be uploaded to the data server or ERP to achieve information sharing.

The dosing machine adopts pulse width modulation (PWM) control method based on incremental PID algorithm, i.e., the duty cycle of PWM square wave is derived from the incremental PID algorithm. The regulation signal derived from the algorithm is output to the D/A holding circuit through the PB1 port (PWM) of ATmega8, and the amount of regulation determines the duty cycle of the PWM square wave. The D/A holding circuit converts the duty cycle of the PWM square wave into the corresponding 0-5V voltage value and outputs it after optoelectronic isolation, and the frequency inverter determines the screw rotation speed according to the voltage value so as to control the flow rate of materials.

Pneumatic batching machine classic PID regulation, feedback, feed-forward loop control gradually developed to batch control, centralized control, object-oriented optimization control, artificial intelligence control gradually developed to multi-parameter multi-objective control, its correction, compensation, algorithms more and more to do a lot of detailed and accurate, and is particularly important. Dosing, and mixing object optimization control, adaptive control or artificial intelligence, through the computer centralized control system itself, no longer attached to other computer hardware.

The positive pressure batching machine adopts a composite predictive control algorithm based on adaptive combined with PID, the algorithm organically combines the characteristics of adaptive control with wide range and fast adjustment, when the deviation of the system is larger than a certain set value, adaptive rule control combined with human experience is used, and when the deviation of the system is smaller than the set value, PID control is used, and the two inputs of the controller are the system expectation value and the deviation respectively, and through the different expectation values, different airborne fallout is predicted, and the effectiveness of the method is proved through experiments.

Negative pressure batching machine chooses METTLER TOLEDO weighing module, weighing instrument is HBM, PLC is Siemens 300 series, and all analog signals are isolated by barrier. According to the formula set up in advance, the material is automatically discharged, and the actual discharging error is automatically corrected in the next discharging, after weighing, when unloading, according to the time set up for pre-mixing, to avoid the uneven effect of mixing in the mixing silo.

Atmospheric pressure batching machine includes raw material storage, transportation, weighing batching, dust removal, material mixing, packaging and filling and other equipment, according to the characteristics of the industry and process requirements, combined with the characteristics of the material, reasonable selection of single material batching, multi-material sequential accumulation, weight reduction batching, weight loss scale batching, belt/spiral scale, bulk material scale and other measurement methods.

Automatic batching machine is a complete set of automatic equipment for dynamic weighing and batching control through electrical control management and visual man-machine software configuration. The electrical control part of the system adopts Siemens PLC, which is programmed according to the production requirements. The software adopts the human configuration, according to the process requirements, through the monitoring system and PLC program to load the material to the weighing hopper weight, flow control, so as to achieve accurate measurement and batching.

Automatic batching machine through PC+PLC monitoring, the use of weighing measurement or flow measurement, can be accurate measurement of the ingredients, the use of PLC to monitor the entire feed and batching process, and complete the system fault display and alarm function, through the frequency converter transmission signal to complete the speed of the screw conveyor.