The weighing system uses pairing, batching, thinning, packaging, storage and other steps to measure the tank and stir at a low speed, mix the pigment filler, auxiliary agent and water for high-speed dispersion, if necessary, grind into white pulp, white pulp is added to the emulsion in batches at a slow speed to form the initial paint. Use thickening agent to adjust the viscosity of the initial paint, use color paste to adjust the color of the initial paint and its depth, or add defoamer to become the finished latex paint, after filtering, weighing, packaging, inspection can be stored or marketed.
020-34563445The proportioning system transmits the corresponding formula and production process parameters to the PLC according to the production process, and the PLC controls the inverter to start the proportioning skein according to the formula parameters and the feeding sequence, and the weighing signal is detected by the PLC. After the feed is weighed in working order, when there is material in the Feeder, the hopper scale door is closed; When the discharge door of the feeder is closed in place, the opening time of the hopper scale arrives, the hopper scale door is opened, and the residual material on the hopper scale is checked. When the residual material exceeds the limit value, the system will alarm, and the hopper scale door will not be closed when the limit value is lower. When the hopper scale door is closed in place, if the scheduled production batch is not completed, the hopper scale door will be closed and the batcher will continue. The signal of adding premix and liquid will be sent at the same time, when the premix is added, the response is reset, and the batcher will start mixing time after the mixing time has arrived. When the dosing machine opens the door, the mixer opens the door to discharge the material according to the level of the buffer hopper, when the opening time is up, the dosing machine door automatically closes, and a new cycle begins after the next batch of materials falls.
According to the formula parameters and feeding order, the raw material blanking and weighing signal acquisition of each bin are completed. The frequency converter is set to multi-speed segment frequency, and the frequency of the frequency converter is controlled by the output point of PLC. When the feeder is batching, the PLC controls the feeder motor to run in the high-speed section of the inverter, and when the amount of raw material is approaching (feed-retention), the PLC output point controls the feeder motor to run in the low-speed section of the inverter for slow feeding. In the feeding process, PLC will compare the amount of raw materials with (feed-retention amount) in real time, in the tolerance range is qualified, stop feeding; Close to the lower limit of tolerance, the low speed section of the inverter should be charged; Greater than the tolerance upper limit is out of tolerance, alarm.
The batching controller receives the control flow data from the host as given, combined with the weighing module technology, compared with the actual detected flow, and calculates the corresponding output (0~5V voltage or 4~20mA current) through the PID control method to control the inverter, so as to control the speed of the motor, so that the raw material flow reaches the given value.
