• Real-time acquisition of the weighing signal of each electronic scale load cell.
• Control signals for screw feeders, scale valves, etc., based on the weighing signal and production recipe.
• Dynamically detect and handle any faults that may occur during the dosing process.
• Lower computer communicates with upper computer.
• PC centralized monitoring. When the ingredients, the weighing instrument to collect the electronic scale weighing sensor signal, with the help of the formula given the raw material ratio control commands generated by the implementing agency, and through the programmable logic controller to control the silo feeder, electronic scale valve And hot and cold mixer valve start and stop and open and close; by detecting the motor protection device, the valve position switch state access to the motor, valve operation and fault conditions, and can be displayed in the electrical control panel analog display operation screen or host computer monitor On display.
The structure of the automatic control system of ingredients is given, which is divided into four parts: sending feeding, ingredient metering, material mixing and lifting feeding. Each part can work independently or cooperate with each other automatically, and can also be separated from the host computer The case of normal work. Ingredients automatic control system components
1.3.1 System One: Send feeding system. Its function is to send the PVC resin on the first floor to the loading operation room to the three storage silos on the third floor. The use of positive pressure dense phase pneumatic delivery. The system consists of compressed air inflation pipe, dust collector, positive pressure pneumatic tank, exhaust valve, inflation valve, feed valve, discharge valve, air knife valve, dust removal motor, vibration motor and other components. 1 # PLC logic control.
1.3.2 System II: Ingredients, auxiliary materials, trace materials ingredients metering system. Its function is to the main ingredient (PVC resin) and a variety of accessories according to the production process recipe were measured, and then transported to 1 # mixer. The system consists of 1 # main scale, auxiliary scale, trace material step feeder composition. 2 # PLC logic control.
1.3.3 System III: 2 # Ingredients, materials and ingredients metering system. Its function is to be the main ingredient (PVC resin) and a variety of accessories according to the production process recipe were measured, and then delivered to the 2 # mixer. 2 # mixer finished finished material stored with a car for the production of PVC foam pipe extruder use. The system consists of 2 # main scale, accessories artificial feeder composition. 3 # PLC logic control.
1.3.4 System Four: 3 # Ingredients, ingredients and ingredients measuring system. Its function is the main ingredient (PVC resin) and a variety of accessories according to the production process formula were calculated, and then transported to the 3 # mixer. 3 # mixer finished finished material stored with a car for the extruder production of PVC heterosexual use. The system consists of 3 # main scale, accessories artificial feeder composition. 3 # PLC logic control.
1.3.5 System Five: Extruder feeding system. Its function is to use the vacuum lifting fan to feed the finished material in the mixing silo to the extruder hopper and to supply the extruder with PVC foam sheet. The system consists of the bottom of the mixed silo gate valve, vibrating screen, transition tank, vacuum suction hopper extruder, extruder vacuum lifting fan and other components. 3 # PLC logic control.
1.3.6 System VI: 1 # mixer control system. Its function is to send the main material, auxiliary materials and trace materials delivered by the second system to mixing and mixing in a mixer # 1, heating, cooling and cooling treatment, and discharging the processed finished material to the transition silo. The system consists of 1 # mixer in the mixing machine and cold mixing machine as well as feed valve, discharge valve, back-blow valve and other components. Using 4 # PLC for logic control.
1.3.7 system two supplementary parts: mixed silo feeding system. Its function is to use the vacuum lifting fan to transfer the finished product in the transition silo to the silo when the finished product processed by the mixer # 1 is stored in the transition silo. The system consists of 1 # mixing machine at the bottom of the mixing hopper hopper, hopper hopper vacuum hopper, blender silo vacuum lifting fan, makeup valve and other components. 3 # PLC logic control.
1.3.8 System Seven: Host computer and lower machine networking communication system. Its function is PC using PC / PPI cable and three SIMATIC S7-214 PPI communication port network communication, using ASCII protocol. A PPI port of a SIMATIC S7-214 connects to a TD200 text display.
