The automatic feeding system provides two stages of fast and slow feeding in the weighing process, and the material flow of fast and slow feeding can be adjusted separately, so as to ensure that the hopper scale meets the accuracy and speed requirements of measurement. The function of the filling valve is to balance the air pressure difference in the system during weighing; The scale body is mainly composed of weighing bucket, bearing bracket and weighing module, which completes the transformation of weight to electrical signal and transmits it to the control unit; The electrical control device is composed of a weighing display controller, electrical components and a control cabinet. The function is to control the system and make the whole system work orderly according to the pre-set program.
020-34563445The feeding system includes conventional control, complex control, logic interlock control and sequence control, and the program should automatically complete the sequence control tasks of each stage according to the instructions of the operator, and realize the accident treatment of various abnormal conditions. The key part of the program is the sequence control of the reactor formulation management, homogenization, reaction, recovery and atomization drying stages by using the sequence control table combined with various conventional and complex controls. Batching sequence control console is a sequence control software platform with perfect function and convenient configuration. It has rich sequence control elements and different scanning modes. By connecting other functional blocks with control process I/O and software I/O, the loop can be automatically given, the control mode can be changed, various information can be output, various formulas can be invoked, and sequence and linkage control can be achieved. The control procedure of the homogenization process is a common procedure for each production line, and only one reactor can start the homogenization control procedure at a time. The homogenization control program is mainly realized by the sequence control table, the vacuum, the addition of different additives, the cleaning process is realized by the independent OC table with the number of steps. The main program (TC table) of each polymerization kettle starts the corresponding OC table, which is achieved by multiple calls, single step execution, and skipping some homogenized public programs. Using the powerful function of the batching, the comprehensive control scheme of the Batching system is realized, and the temperature is basically controlled within the set temperature range by flexible use of the sequence control program, thus stabilizing the process parameters and improving the quality of the batching system.
In the weighing control system, 3 Weighing modules are connected in series to improve the output sensitivity, and 3 independent power supplies are used. Since the performance of the power supply, the post-amplifier and the A/D converter directly affect the control accuracy, the LM399 high-precision voltage regulator, the ICL7650 instrument amplifier, the ICL7109 low-drift A/D chip are used in the Weighing system, and the external reference is used with high stability, thus ensuring the accuracy in the entire linear measurement range. Because the 80C31 I/O interface line is limited, the 8155 is extended, because the 8155 internal has 256BytesRAM, 22-line I/O interface, which not only expands the storage, but also expands the I/O; At the same time, 8155 internal timer is used for F/V conversion to complete D/A function, making full use of 8155 chip. In order to prevent the interference of the backward channel into the CPU system, the input/output interface of the 8155 and the outside world are all photoelectric isolation, and the PA and P of the 8155 are used. The port is used as an output line to drive the skein selector switch, P. The port serves as a position limit input signal for the hybrid door. The display part uses a 0.5 hour digital tube, which is divided into two rows, the upper row shows the current amount of ingredients, and the lower row shows the error or cumulative value of ingredients. Keyboard is mainly used to input formula and various parameters, in order to save hardware lines, LED display and keyboard are dynamic scanning structure.
