Batching scales in order to control personnel directly and accurately weighing data of raw materials, the production process can not be a small amount, lack of material, loss of material. To realize the manual or automatic to select the bin number location, the bottom line of the various dosage inventory for automatic alarms and other functions, the digital display of the electronic scales and the PLC and touch screen for information exchange, all system control will be brought together in a special system software, the controller only need to click on the appropriate location to control such as electrical switches, rotating transport components, water, gas valves, etc., the human-machine interface is very good! The human-machine interface is a good way to display the whole production line in the form of dynamic and static diagrams on the computer screen, so that the staff can understand the operation of the whole production of ingredients without leaving home.

The dosage scale is made by controlling the related switches, and the human-computer interface is the process of controlling, all the operations are done on the computer software, and any clicks can directly act on the pneumatic valves, prozac uses an electrical control integrating analog and switching quantities, and it completes the corresponding operation according to the requirements of the staff on duty. The PLC output current signal controls the output frequency of the frequency converter, which ultimately regulates the motor speed, thus controlling all the production processes related to the motor.

The dosage scale utilizes the analog input template in the PLC to collect the data on site in real time. The actual values are calculated according to the different ranges of the flow rate of each weighing module's measuring tank, and the converted values are averaged to minimize the flow rate fluctuations, which facilitates the application of the weighing values to the PID circuit adjustment and ensures the stability of the weighing adjustment. The display of material level adopts the display mode of one way on site and one way in the main control room, which facilitates the real-time monitoring of the material level of the silo from two aspects, and ensures that when the material level is low, the on-site personnel will take the measure of adding material to prevent the occurrence of material breakage.

Pneumatic dosage scale utilizes PLC output and weighing instrument to control the motor frequency, and controls the on-site motor frequency converter through three ways of ratio giving, flow rate giving and frequency giving at PLC output. When the operator selects the proportioning giving on the operation screen, he only needs to input the total flow rate of the dosage and the proportioning ratio of each sub-scale, then the amount of material to be discharged from each scale can be calculated automatically and the tracking adjustment can be carried out according to this discharging amount. The flow rate of each scale is controlled through the flow rate setting area on the screen, which is required for the PID parameterization of each scale.

Batching scale adopts metering tank, equipped with pressure or tension weighing module for force-electricity conversion, the signal is amplified and processed by weighing instrument and then connected to PLC or DCS to complete the metering, and at the same time, it is used in conjunction with PLC. Based on the composition, working process, working principle, hardware and software design of metering and dosing automatic control to improve the quality of the process. The main ratio, temperature, time and material pre-treatment. PLC ladder programming is used to realize a variety of logic sequence control and flow rate detection control. The control system can realize automatic/manual switching and frequency conversion/industrial frequency switching (if it is necessary to quickly inject into the reaction tank, the industrial frequency operation mode can be used).

The main control component of the belt scale is composed of CPU module, I/O module, high-speed counting module, AD/DA module and scanner module, which is responsible for the digital measurement and output control of the whole belt scale and provides the input and output signals required for external connection. Two 16-bit analog inputs and two analog output modules NI04I A/D for weight sampling, D/A for frequency control and current instantaneous flow output 4-20mA current signal. The weight signal is converted into 4-20mA current signal by the transmitter and sent to NI04I, and the speed adjustment signal after computer processing is sent to the inverter by NI04I, and the coded pulse from the speed encoder is sent to the high-speed counter and calculated by PLC to obtain the running speed of the belt.

The belt scale is equipped with a load weighing module bridge, mounted on the longitudinal beam of the conveyor. The weighing rollers on the weighing bridge detect the weight of the material on the belt and produce an electrical output signal proportional to the belt load. The speed sensor is directly coupled to the follower pulley or large diameter rollers and provides a series of pulses, each pulse representing a unit of belt motion, at a frequency proportional to the belt speed. The weighing instrument receives the output signals from the weighing module and the speed sensor, electronically multiplies the belt motion and belt load, and produces an instantaneous flow value and a cumulative total by calculating the time. The cumulative total and the instantaneous flow are converted into selected engineering units and displayed on the accumulator respectively.

The weighing scale acts linearly on the weighing module through the weighing frame, and the velocity sensor measures the speed of spiral operation. The instantaneous flow rate of the material can be measured after calculation. The instantaneous flow rate and cumulative flow rate are displayed after calculation, and the instantaneous flow is sent to the computer system as an input signal with 4~20mA analog current signal at the same time. After comparing the signal with the set value, the computer outputs 4~20mA analog current signal to control the speed of the feeding motor through the inverter, which realizes the closed-loop control of the material discharge flow.

Measuring and feeding system adopts advanced control algorithm and new generation of single crystal chip microprocessor, which is more powerful, with faster operation speed and stronger anti-interference ability, automatic calibration compensation and vibration prevention function to ensure the best dosing accuracy. It can be automatically calibrated every time it is turned on to ensure accurate precision. Users can directly access the PLC system, terminal control system to realize multi-range control and automation control. The system digitizes the weak weight signal output from the weighing module to obtain high precision weighing data. Rich digital filtering technology is set up in the software, as well as emergency software to prevent interference with the system out of control.