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 Frequency Conversion 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 Traction 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 Reaction 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.

The Gear automatic dosage system consists of weighing module junction box, weighing instrument, wiring cabinet, PLC control cabinet, and the main hardware consists of two computers, high-performance microcomputer controllers, human-machine interface, high-speed and high-precision weighing units and internationally famous low-voltage electrical appliances, combined with self-developed professional control software to realize the dosage system for chemical liquid production; at the beginning of each dosage cycle, the difference between the previously set dosage quantity and actual dosage quantity will be taken as the compensation value for the set dosage quantity of this cycle in order to eliminate the accumulated error of each scale dosage quantity. At the beginning of each dosage cycle, the difference between the previously set dosage amount and the actual dosage amount is taken as the compensation value for the set dosage amount of the current cycle, so as to eliminate the accumulated error of the dosage amount of each scale.

The frequency modulation automatic batching system measures the powder quantity by using the weighing module and the rotational speed of the screw conveyor. The screw conveyor in the measurement unit operates at a constant speed. The rotational torque of the screw conveyor is transmitted to the weighing module through the silo. The output voltage of the weighing module is proportional to this rotational torque, and it is converted from analog to digital form through an analog-to-digital converter. The rotational speed of the screw conveyor is measured by the speed-weighing module and converted into a digital quantity through a frequency converter. Finally, the rotational torque and speed are input into the weighing instrument for calculation, thereby obtaining the instantaneous flow rate of the powder.

The Vibration automatic mixing equipment adopts decentralized control and centralized management control mode, and the three-level structure realizes the two-way coordination of process demand and energy saving of the batching system. Decentralized dust point local realization of vibrating screen, hopper and other stations of the branch adsorption point automatically open and close, effectively reducing the dosage of non-dusting ventilation requirements; the central controller to achieve the dust point of the centralized monitoring of the working conditions, according to the operation of the workplace to calculate the real-time demand for the kettle dust dosage of the air volume. Thus the frequency control value of frequency conversion operation is given, and the frequency adjustment instruction of 4~20mA is transmitted to the frequency converter of dust removal fan to realize the continuous variable condition adjustment of dust removal air volume.