The automatic dosing machine calculates the formula according to the detection data, and inputs it into the computer system through the man-machine interface or computer network. The computer control system automatically calculates the supply ratio of each raw material according to the detection data and the process formula, and then the PLC control system synthesizes the supply speed of each raw material supply system to accurately and continuously complete the raw material ratio according to the process sequence.
020-34563445The batching control system is guided by centralized control and decentralized management. The computer and PLC are selected to form the structure of the upper and lower computer, so as to realize the system control goal. The hardware part includes the design and selection of upper computer, lower computer and communication hardware. Siemens S7-200 series PLC is selected, and the reliability can meet the control requirements well. The communication hardware is wireless communication equipment, and the software design uses STEP7-Micro/WIN32 programming software as the development tool.
The feeding part is the actuator for feeding materials from the silo to the weighing equipment, and electromagnetic vibration Feeder, screw feeder and two-speed electromagnetic valve are selected; The weighing part is composed of weighing module, standard connecting parts, junction box and hopper scale, which is used to weigh materials and detect errors together with weighing instruments; The discharging equipment consists of an emptying valve, an electromagnetic vibration feeder and an electric vibration valve; The batching control system is composed of weighing instrument, upper computer, CRT display device, programmable controller, wireless communication equipment and other control devices. The batching weighing module should be adjusted regularly to ensure the batching accuracy of the system.
Control requirements
1) The automatic control and manual control function of the Batching system. In the automatic control mode, the operator inputs the material formula and other control parameters from the keyboard to automatically complete the process control. Manual control mode means that the operator inputs the material formula, other control parameters and specific control requirements from the keyboard and controls the operation step by step.
2) Wireless communication mode (free port communication mode) The system adopts wireless communication mode and free port communication mode.
3) Alarm and alarm record inquiry of equipment operation fault state, monitoring software monitors the operation state of each actuator, and can carry out emergency treatment and alarm prompt for various faults, so as to quickly eliminate faults. At the same time, the flexible control mode of the system also provides convenience for fault handling.
4) Automatic compensation function of feeding drop value. In the process of batching, it can automatically correct the weighing of airborne materials, which improves the weighing accuracy.
5) The monitoring and display function of the whole process system operation state. The display dynamically displays the material quality and the running status of each actuator.
6) Production management and report printing, which is used to manage production (such as recipe management) and report printing.
