Automatic dosage system is an important part of the reactor mixing production process, through the electronic weighbridge directly collects the weight signal, automatic control of weighing, the operator through the keyboard or mouse in the upper computer human-machine interface (HMI) to enter the dosage information (dosage type, weight, etc.), monitor the whole process of the dosage control, print the dosage of the results and the production of the report, to achieve the integration of measurement, control, and management of the process of the dosage, is a practical and effective way to achieve the dosage process. It is a practical and effective method to realize the integration of measurement, control and management of the feeding process.

The structure of the weighing and mixing equipment consists of a high level bin, a valve, a vibrating motor, a weighing module and a reactor, as well as a set of position detection devices. During the charging waiting phase, the mobile drum is parked on the electronic scale and at the position of the reactor charging port waiting for control commands. According to the charging parameters entered by the operator, the silo valve opens to discharge the material. The amount of feed is continuously collected through the electronic scale, and the valve is closed when it reaches the dosing set value of one advance, which can be calculated by the time of the valve or obtained by experience. When the added material reaches the specified weight, the valve is automatically closed.

The pre-set dosing plan of the weighing and mixing equipment automatically weighs various materials, automatically controls each link of dosing, and completes the dosing process. According to the amount of feeding, the speed of the motor is controlled. When the feeding value is close to the set value, the low-speed feeding mode is adopted. Due to the retention of materials in the air between the feeding port and the feeding tray, the motor stops rotating when the control lead is reached. When the actual batching process reaches the control lead amount, due to the difference in material density, the quality of the air material retained after the motor stops rotating is different, and the lead amount of the motor stop is set according to the actual operating condition.

Weighing mixing equipment through the organic combination of computer technology and traditional relay control system, in the batting process, PLC is mainly responsible for receiving external switching signals, in order to judge the current system operating state, and output a variety of control signals, control contactor, relay, solenoid valve and other components for the corresponding action. According to the specific batching process, at the beginning of the batching, the motor runs normally, the feeding system is fed at a high speed, and the PLC point control mode is used when the weight of the material is close to the target value, so as to ensure the requirements of the measurement accuracy of the material.

The automatic batching system is based on the electronic weighing system which is composed of the original weighing module and weighing instrument, and completes the automatic control of the whole process of batching conveying and mixing from the exit of the bin to the exit of the mixer by means of fieldbus communication and the existing peripheral executive equipment. The dosing system displays and monitors the alarm prompts and interlocks of the whole system, and completes the man-machine dialogue of formula management, production data management, equipment operation status management and production command to meet the mixing requirements of production.

The automatic batching system ensures the real-time communication between the upper PC and PLC, directly collects the weight signal through the electronic weighing, and automatically controls the weighing. The operator input the feeding information (feeding type, weight, etc.) on the HMI of the upper computer through the keyboard or mouse, monitors the whole process of feeding control, and prints the feeding results and production reports. It is a practical and effective method to realize the integration of measurement, control and management in feeding process.

Weighing and mixing equipment to achieve the main and auxiliary batching machine two-stage control, each screw is driven by a motor; Two material level sensors; A speed sensor; A weighing sensor and a frequency converter. The switching quantity controls the running state of the motor, the input of the control end of the inverter is determined by the digital input of the PLC, and the high-frequency pulse is transferred by the inverter and transmitted to the spiral drive motor. The level sensor begins to detect whether the hopper contains material, and the speed of the motor is monitored by the speed sensor.

The mixing and feeding equipment adopts the regulating valve or changes the pressure of the issuing tank for dosage, and PID adjusts the weight value to the pressure of the dosage tank or the opening of the regulating valve. The standard proportional function and the proportional calculation of the weighing system are used to ensure the stability of the weighing performance. The given value is multiplied by a multiplier to calculate the target value of the dosage weight, which is given remotely as a control quantity, and the reciprocal is taken to calculate the weight of the discharged material by a multiplier, thus realizing interactive dosage.

The weighing and loading device is sent to the weighing area through the screw, and the weighing sensor outputs a voltage signal according to the pressure of the material, which is amplified to output a metering level signal, which is proportional to the weight of the material. Then the signal is sent to the upper computer interface, and converted into a weight signal, the weight value is displayed on the current PC, and is sent to the PLC, which will compare and calculate the given value of the proportioning set by the PC. This control quantity is transmitted to the frequency converter and the output value of the frequency converter is changed to complete the control of the speed. Adjust the dosage to the same as the set value to complete the dosing process.