The automatic blanking system sends a signal to the cylinder through the PLC to drive the ball valve to work, the weighing bucket is opened, and the unloading begins to the packaging bucket on the reactor mechanism. When the value of the weighing module does not stay at a certain value, the PLC sends a signal to the cassette mechanism to start packing, and then sends a signal to the cylinder, the weighing bucket is closed, the PCL sends a signal to the cylinder to drive the ball valve, the storage hopper is opened to start unloading, and the valve automatically stops unloading when the target weight is reached.
020-34563445In order to control the process indicators of the batching process, the feeding system feedbacks the weight of various raw materials and batching machines to the PLC controller through the weighing module, and the PLC controls the speed of the motor and pump through the frequency converter. Thus control the quality of various raw materials, and monitor the operation of the whole system through the monitoring computer. Rockwell Controllogx controller, combined with Rockwell ControlLogixPLC and Ethernet /IP and DeviceNet three-layer network. The PLC communicates with the upper computer and frequency converter respectively through Ethernet and device network, and the frequency converter is connected with the pump and the motor. The model of the power module is 1756-PA72/C, the CPU module is 1756-5561, and the Ethernet module is 1756-EN-BT. The Batching system is used as an example. L1, I2, and i3 are AC three-phase power supplies, and 0A0 is the circuit breaker for protection. The frequency converter is connected to the frequency converter through the contactor QA1~QA5 and the thermal relay drive device BB. If the working current is too large, the thermal relay drive device BB will work and the currently connected circuit will be disconnected, playing a protective role.
Computer-based automatic batching system, production and process automation, visual information, display and control strategy, solution weighing provides various functions suitable for industrial graphic display, alarm, data recording and reporting, can achieve high performance process coupling, fast picture update and reliable data processing. It provides all the features to ensure reliable control of the production process in the harsh environment of Windows standard configuration, the ingredients have a rich interface, and it is easy to establish a human-machine interface with the standard or user program to accurately meet the actual production requirements. And by developing their own application system based on the open interface of 32-bit application system, Windows Windows 32-bit operating system ensures fast response to process events and provides various protection against data loss.
The feeding system adjusts the speed of the wideband or spiral motor by frequency converter to change the feeding amount. The traditional PID control method can not meet the requirements of stability and accuracy. Therefore, the band PID control is used to avoid the control action is too frequent, and the oscillation system overshoot caused by frequent action and field vibration is eliminated, which leads to the instability of the feeding amount. The control principle is to compare the instantaneous flow feedback value of the material with the given value of the computer, and then adjust the PI of the spiral in the PLC, and control the speed of the spiral through the inverter to achieve the requirements of stabilizing the material. The tracking deviation, instantaneous flow feedback value is an adjustable parameter that can be determined based on the process requirements of the actual control object or actual experience.
