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.

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.

The 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.

.Automatic mixing system through the programmable controller touch screen automatic control program, can automatically mix a variety of raw materials in different order and temperature, to achieve the ideal product manufacturing automatic mixing equipment. The main tasks are initial data input, material tracking, process parameter setting calculation, data recording and report, human-machine dialogue processing, data communication, analog resin model, historical data processing, application system startup, event monitoring, etc. The process control automation level computer system reserves the communication interface with the continuous casting and computer system.

The control system of the feeding system consists mainly of a PLC, a touch screen, actuators and detection elements. The computer downloads the program and monitors the operation of the equipment through the Ethernet PLC on-line. It communicates with PLC through Modbus 485 communication protocol to display the running status of the equipment and set the running parameters for starting and stopping the equipment. The actuator is responsible for executing the instructions from PLC and performing the corresponding actions. The detection element sends the status and parameters of the equipment to the PLC.