The Loop dosing system automatically adjusts the wind speed, circulating liquid flow rate and inlet liquid temperature according to the set operation parameters, collects the parameters of inlet and outlet liquid temperature, wind speed, atmospheric pressure, circulating liquid flow rate, wind resistance and liquid resistance, and sends them to the upper computer. The upper computer reads the data sent by each on-site measurement and control unit and calculates the liquid-side heat dissipation and air-side heat absorption according to the corresponding formulas specified in the standard. Usually chemical and physical changes occur in the dosage process, which can be composed of a number of simple tasks for the control of weighing. The process unit includes all production operations and auxiliary operations in batch production, which are processed in accordance with the order and operating parameters specified in the formula, guaranteeing the control of the dosage process without changes in quality.
020-34563445The controller used in the cyclic Batching system is the Siemens S7-200 programmable controller, which uses dual CPUs to form a redundant system. The STEP7MicroWinV4.0SP6 programming software provided by Siemens is used as the human-machine interface to write program debugging programs, download programs, etc. The PC and PLC experimental machine are connected by a PC/PPI cable for communication, and the corresponding parameters are set. Connect the PC to PL using RS-485 bus. It consists of a heating device, weighing module, digital temperature sensor, data acquisition card, and PC. The digital temperature sensor converts the measured liquid temperature into a digital quantity and transmits it to the PC through a data acquisition card. The weighing control system converts the real-time volume of the mixed liquid into a digital quantity and transmits it to the PC through the data acquisition card. The monitoring system based on LabVIEW software displays the process of liquid mixing in real time.
The spiral batching system adopts a base and a spiral conveyor installed on the base. The spiral conveyor adopts a shell and a rotating shaft installed inside the shell. The shaft is equipped with spiral blades, and one end of the shaft is connected to a drive motor with a variable frequency controller. The shell is equipped with a feeding port and a discharging port. The base is also equipped with a gantry bracket, and a weighing module is installed on the gantry bracket. The pulling end of the weighing module is set at one end of the discharging port of the spiral conveyor shell; The drive motor is equipped with a speed sensor; The weighing module and speed sensor are both electrically connected to the control instrument. The weighing hopper machine adopts a weighing scale, which is in a frame structure. A hopper is placed at the bottom of the weighing scale, and a hopper scale is installed in the middle of the weighing scale. The bottom of the hopper scale is equipped with an output pipe through an electric ball valve, which extends into the hopper; There are mounting brackets fixed on the outer wall of the middle part of the hopper scale and on the weighing scale, and the mounting brackets fasten the weighing sensor; The top of the hopper scale is connected to the material through a first inlet pipe, which is equipped with a pneumatic valve. The top of the hopper scale is connected to the water source through a second inlet pipe, which is equipped with an electromagnetic valve. The batching system adopts an overflow pipe, with the bottom of the overflow pipe extending into the hopper. The top of the overflow pipe is equipped with a funnel, and the upper side wall of the hopper scale is equipped with an overflow outlet, which is connected to the funnel. The front end of the weighing scale is equipped with a box door through hinges. During the use of the ingredient system, the pneumatic valve is first opened and enters the hopper scale from the first inlet pipe. Through the action of the weighing sensor and the hopper scale, when the weight of the required material in hopper scale 7 meets the standard, the pneumatic valve is closed and the feeding is stopped. By opening the pneumatic ball valve, the material is output to the hopper, and the sampling is completed. The required accuracy and precision of material collection have been greatly improved.
The temperature heating device applies different temperature signals to the digital temperature sensor by changing the temperature of the liquid. The data acquisition card collects the temperature signals to the PC, analyzes and calculates the collected data using LabVIEW software, and finally displays the measurement results on the batching system interface. The reaction kettle Weighing system monitors the liquid mixing process in real-time, collects measurement data through a data acquisition card to a PC, and displays the mixing container curve and product container curve on the weighing system interface. The feeding system includes functions such as data acquisition, storage, processing and analysis, display, and historical data. The front panel is a graphical user interface that provides three modules: liquid mixing, temperature acquisition, and system operation. The liquid mixing module has a mixing container curve and a product container curve, which display the mixing situation of the two liquids and the weight of the product, respectively. The mixing speed of the liquid can be changed by adjusting the valve and pump, and there is a digital display on the liquid mixing container. The temperature acquisition module can set the liquid heating temperature and display the collected temperature data in real-time on the mixed temperature curve. In the system operation module, liquid mixing and temperature collection can be stopped, automatically, and manually operated, and help information for operating this monitoring system can be provided.
