The supply system uses a vacuum transfer method, and the plastic material is transported from the storage tank to the central dehumidification monotone system through a centralized pipeline system, and then the monotone material is transported to each injection molding machine. The mixing machine chooses the description method of "one machine and one tube" to ensure that the air of the whole system is transported to the material center to avoid the moisture return of the material after dehumidification. Together in each transmission running smoothly, no appearance of blocking material.
020-34563445The batching machine adopts Siemens S7300 series and ET200 modules, and the software adopts Siemens STEP7 series and WINCC series. The coating raw materials are controlled in a certain proportion according to the technological requirements, and the feeding system is given according to the material level information of each material reaction tank. Ingredient control can be proportioned according to the weight and chemical composition of the raw material. At present, the ingredients of domestic manufacturers are mainly carried out by weight ratio method.
The feeding system is to control the weighing screw and feeding device under the raw material reaction tank. According to the theoretical flow rate of the weighing screw and feeding device, the PLC system sets the ratio of raw materials and the total feeding amount, and arranges the sequence of raw materials. The flow rate of the equipment under each reaction tank is set through the communication of the upper computer. After the Weighing system is started, the weight signal and speed signal are sent to the secondary weighing instrument, and the instantaneous flow and accumulation are calculated by amplifying A/D conversion, and displayed in the on-site weighing instrument.
The weighing display transmits the signal to the PLC module. The PLC analog input module collects the weight signal and speed signal of the electronic weighing screw and feeding device, and performs self-tuning operation according to the parameters set by the user. If the set value deviates from the current value, the PLC analog input module will output a standard signal (4~20mA) to the inverter for the equipment to be adjusted. After receiving the PLC signal, the frequency converter will change the speed of the equipment in real time, which will reduce or increase the feed for the disk, and reduce or increase the material flow for each speed control. So that the Batching system has a stable state.
When the batcher operates normally for a certain period of time, the material level of the reaction tank will fluctuate due to the paint layout. When the thickness of the material layer with the conveyor is stable, the PLC will adjust the flow rate at each discharge port of the reaction tank according to the level weight of the material in the reaction tank measured by the weighing module of the mixing tank, so as to ensure the balance of the material in and out of the mixing storage tank. The automation of mixture is mainly to add solvent control and electrical chain for two mixes. Since the purpose of mixing is to mix well, the solvent is calculated according to the total amount of the mixture before mixing and the timely moisture value of the moisture detector before mixing according to a certain percentage, and the water flow is adjusted by controlling the electric regulating valve on the water pipe of a mixing house. The current value of each feed outlet of the batching reaction tank is accumulated to calculate the material flow rate of a mixed belt and share it with the mixture automatic solvent adding weighing system. According to the total amount of material and the percentage of water content before the material enters the mix, how much solvent needs to be added to the mix is calculated to provide a solvent adding basis for the automatic solvent adding.
