The Weighing system of reaction kettle mixes powders with different materials and weights. Based on computer technology, control technology, communication technology and graphic display technology (that is, 4C technology), the on-site control station, control management station, inspection station, operation management station and engineer station distributed in the industrial site (nearby) are connected through the communication network to jointly complete the integrated control system of decentralized control and centralized operation and management.

In the batching production process, the powder is evenly distributed on the spiral of the silo through the feeding hopper, the load of the spiral is detected by the weighing module through the weighing batching mechanism, and the spiral speed is detected by the tachogenerator. After rectification and amplification, the signal is input into the control system, which receives the load signal on the spiral and the speed signal of the spiral and obtains the actual feeding speed after processing. The actual feeding speed is continuously compared with the set feeding speed, and the spiral speed is adjusted to make it accurately feed at the set feeding speed.

The weight and transmission speed of the material are detected and amplified by the weighing module and the speed module, and then become digital pulse signals through the weighing instrument and the digital-to-analog conversion circuit. The PC bus control computer is used as the central controller to monitor the operation of the production line. After the pulse signal of the detected quantity is isolated by the photoelectric isolation plate, it is gated by the industrial computer in batches and sent to the infrared control for counting. The computer calculates and processes the counted material weight and speed signals to get the actual flow of ingredients.

The Electronic scale of the reaction kettle uses the pressure compensation link to modify and correct the function of the weighing system, and its signal is connected to the weighing module and weighing instrument to realize the alarm of material shortage. Central feeding regulator, through the cylinder-driven double-door feeding mechanism, adopts single-cylinder motor to drive double-door feeding, which is easier to realize multi-stage feeding and accurate control than the single-door feeding mode driven by cylinder at present, and improves the accuracy and speed of weighing. It is pneumatically driven to rotate, and the feeding door is driven to open and close by two connecting rods. Weighing mechanism: The ends of three weighing module supports are connected with a weighing sensor respectively. When the weighing hopper is horizontal, the weighing weight is the sum of the measured values of the three sensors. After the weighing of the discharging mechanism is finished, the cylinder drives the discharging door to open, and the material falls to the designated position through the discharging bin. Usually, an automatic Filling machine mechanism is added at the end of the discharging bin, and a corresponding ready detection switch is provided to realize automatic metering and packaging.

As an extension module of PLC, the weighing controller composed of weighing module can exchange data with PLC quickly, and the three weighing sensors are connected to the weighing instrument after being integrated through the junction box. PLC sends out high-speed pulse to control the cylinder to drive the feeding door, and the zero switch is used for the zero operation of the cylinder motor. Various parameters of the scale can be set through the touch screen, and man-machine interaction can be realized with the button indicator light. The discharging cylinder is controlled by PLC to realize the discharging action. The state of discharge detection switch and material level switch is input into PLC to realize the open and close state detection of discharge door and the material level detection of grain storage bin. In order to give consideration to the accuracy and efficiency of weighing, combined with the advantages of Hefu pipeline driving technology, multi-stage feeding methods are adopted, namely, large investment, medium investment and variable flow fine investment. Large investment and China Investment Corporation (CIC) realize fast feeding and improve the rapidity of weighing process; Variable flow fine casting is a closed-loop control system consisting of sensor, weighing module, PLC, actuator and control algorithm, which realizes accurate control of fine casting and ensures weighing accuracy. Start feeding during control, when the weight of materials in the hopper reaches the set value of large investment, close the large investment, and delay to avoid overshoot of large investment, and enter the investment stage; Close CIC when the material weight reaches the set value of CIC, and enter variable flow fine casting after delay; When the material weight reaches the target set value, close the valve, delay to overcome the jitter, and wait for the blank material to fall, and then complete a weighing cycle.

Due to the nonlinearity of material falling, material bonding, actuator wear and other reasons, the blank material may change continuously with the passage of time. Therefore, the compensation for blank materials should also be adjusted automatically over time. The specific method is: at the end of each weighing, record the difference between the measured actual value and the target value, and record the weight of materials in the weighing hopper when the cylinder is closed and the feeding door is closed by the advance control. Ideally, the amount of blank space is equal to the target weight. Use half of the previous average to correct this advance, which can be set through the touch screen.