How the automation system works in sintering batching
The hardware of the automation system adopts Siemens S7300 series and ET200 modules, and the software adopts Siemens STEP7 series and WINCC series.According to the technological requirements, the raw material of sintering is controlled in a certain proportion, and the feeding system is given according to the level information of each bin.Batching control can be based on the weight of raw materials and chemical composition of the ratio control.At present, domestic ingredients are mainly prepared by weight ratio method.
Weight ratio is to control the electronic weighing belt scale and feeding device under the raw material warehouse. According to the theoretical flow rate of the electronic weighing belt scale and feeding device, the PLC system sets the ratio of raw materials and the total feeding amount, and at the same time, the relationship between the order of the raw material warehouse should be considered.After the system is started, the weight signal and speed signal are sent to the secondary instrument. The instantaneous flow rate and cumulative amount are calculated by amplifying A/D conversion and displayed in the field instrument.The instrument is transmitting the signal to the PLC module.PLC analog input module to collect electronic weighing the weight of the feeding device of belt scale and signal and speed signal, according to the parameters set by the user from setting calculations, if there is a deviation value with the current value of the PLC analog module will in view of the need to adjust a standard signal output device (4 ~ 20 ma) for frequency converter and inverter after accepting the signal to the PLC will be real-time speed change device, for the disc is feed to reduce or increase, for each speed said makes the material flow to reduce or increase.So that the system has a stable state.When the sintering machine is in normal operation for a certain period of time, the material level of the mixing bin will fluctuate due to the sintering cloth. When the thickness of the material layer is stable, the PLC adjusts the flow rate of each feeding port of the mixing bin according to the material level measured by the weighing sensor of the mixing bin to ensure the balance of the feeding and discharging of the mixing bin.Mixing automation is mainly two mixing water control and electrical linkage.As the purpose of a mixing is to mix, so according to the total amount of a mixture before mixing and the timely water value of a water detector before mixing by a certain percentage of water calculation, through the control of the first mixing home water pipe electric control valve to regulate the flow of water.Add up the current value of each discharging port in the distribution bin to calculate the material flow of one mixing belt and share it with the automatic water adding control system for the mixture. Calculate the amount of water to be added to one mixing according to the total amount of material and the percentage of water content before the material enters one mixing, and provide the water adding benchmark for the automatic water adding of one mixing.
