The weighing and dropping system realizes the process control of batching. According to the need of batching, various control function program modules and control subroutines are designed in the control software. It mainly includes "control system state initialization", "automatic work control", "manual work control", "automatic batching", "state test", "fault detection" and so on. The dosing control software follows the automatic control and manual control modes. In order to improve the performance of the batching control system, improve the accuracy and speed of the batching system, and ensure the reliable operation of the control system, effective measures are taken.

The mixing ingredient system transmits the raw material formula data to the lower-level PLC. The PLC controls the various raw materials' input through the screw conveyor and the weighing distribution machine, and stores them in the corresponding ingredient bins. During the ingredient mixing process, the screw feeder delivers the raw materials one by one to the hopper scale. The materials with a larger proportion are sent to the large hopper scale; those with a smaller proportion are sent to the small hopper scale for weighing. The weighing module detects the quantity of each material and transmits the signal to the weighing instrument, which then controls the feeding of the screw feeder and thereby controls the quantitative distribution of each material.

The Closed loop mixing dosing system outputs a certain number of square wave pulses through PLC programming to control the Angle of the stepper machine and then control the dosing feed of the servo mechanism. The loop pulse distributor distributes the control pulses output by the programmable controller to the corresponding winding according to the power sequence of the stepper motor. The pulse distribution of the stepper motor controlled by PLC can be realized by software such as batching, capping, sealing, palletizing, weighing equipment and corresponding conveying.

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.

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.

The Double Cone pneumatic mixing system feeds the material into the weighing bucket according to the specified proportion of the formula, and weighs it, and then sends it to the mixing machine for a certain time to stir and evenly mix into the finished product. All kinds of fixed formulations are input into the computer in advance, and the computer controls the feeding, weighing and mixing according to the proportion of the formula, and detects the signal of the weighing module in real time, makes a judgment, and issues orders to the executive mechanism of the batching, so as to realize the batching automation. The entire production system is equipped with manual control auxiliary mechanism, which can be controlled according to automatic or manual operation.

The Bus automatic batching equipment is connected to the field weighing instrument through the bus, the control field equipment, the frequency converter of the weighing feeder, etc., which has a high degree of intelligence and fast processing speed. In the process of batching production, the main material and auxiliary materials are matched in a certain proportion to complete the measurement of the transported material. It is mainly responsible for real-time control of conveying and weighing process, fault detection, display and alarm, and adjustment of spiral speed by output signal to inverter.

The batching and weighing system is realized by using fuzzy adaptive PID control. The parameters of the controller are adjusted online to track the given input, accelerate the adaptive process and reduce the tracking error. Through the microcomputer to connect a number of weighing feeder, can be used for bin batching, at the same time batching materials can be up to 9 ~ 12, to carry out a variety of materials continuous batching, based on the structure of the bucket scale, can directly carry out the weight calibration, through the weighing hopper each moment test calculated the actual discharge amount, and then closed-loop adjustment, so as to achieve a higher control accuracy.

Weighing and discharging system in is an organic whole, storage unit, dosing unit, control unit is the three inseparable basic units, is to ensure that the flow of material dosing of the necessary conditions. The basic unit of material and conveying link in the material changes will have an impact on the flow. Batching control not only rely on the improvement of the regulating device and the optimization of the control software to continuously improve the quality of the dosage regulation, but also with the dosage process is inextricably linked to the dosage process, only from the dosage engineering point of view, in order to grasp the direction of the development of the dosage control, to meet the modern industrial automation of the requirements of large-scale production.