Self-Control Reaction kettle weighing system is a kind of production equipment used in industry for automatic and accurate proportioning of different powder or liquid materials according to a certain ratio, which usually consists of weighing instrument, PLC system and upper computer. Including raw material storage body, conveying body, weighing and dosage body, dust removal body, material mixing body and other equipment; dosage mode can be based on the industry characteristics, production process requirements, specific material characteristics, reasonable choice of "incremental" or "decreasing" weighing mode. It has various working modes such as single hopper and single material, single hopper and multiple materials, and multiple hoppers and multiple materials.
020-34563445The self-controlled reaction vessel Weighing system takes the reaction vessel as the control unit. Each reaction vessel is equipped with a corresponding formula setting interface for different formula feeding and conveying, flexibly responding to the tasks of different production batches and the requirements of different formulas.
The formula, feeding and discharging of the automatic feeding system are all controlled by a computer. The scale body, apart from the hopper, also includes a dynamic weighing module, a precision amplifier, an analog-to-digital converter, a microcomputer, a display, a printer and an execution system, etc. The touch screen control system can control multiple reaction tanks and agitators, and can also control the time of dry and wet mixing. It can prepare several to dozens of materials, and simultaneously display the batching process and print the names, masses, total masses, cycle times, formulas, daily reports, monthly reports, etc. of each material. The computerized automatic batching production line has a large formula storage capacity, a wide variety of batching types, high speed, high accuracy, and can provide rich software, making program modification convenient. It is a product with a relatively high degree of automation. Through the weighing instrument or touch screen, the required weight of various materials is set. The screw conveyor automatically conveys them in sequence to the Batching system for automatic weighing and flow control, thereby achieving precise measurement and batching.
The process steps of the weighing system for the reaction vessel are decomposed and controlled as follows
1. Raw material transportation Before raw material transportation, an internal logical judgment should be made to determine whether the raw material can be transported. To be transported, all the following requirements must be met: The liquid level of the raw material storage reactor A/B/C must be higher than the low liquid level value, and the temperature must be above 120℃. Whether the transfer pumps P103A and P103B are in operation (both must remain stationary simultaneously); The metering reaction vessels A/B must have at least one weighing unit with a weight of 0kg.
2. Selection of raw material storage reaction vessels: When choosing a storage reaction vessel, select the one with the highest liquid level among the reaction vessels that meet the raw material transportation conditions. After the selection of the raw material reactor is completed, the pneumatic valves for the corresponding pipelines of the batching are selected, and the raw material pump delivers a certain weight range to the designated reactor.
3. Selection of metering Reactors: Under the condition of meeting production requirements, select A metering reactor with a weighing unit weight of 0kg. If both metering reactors are 0kg, the default selection is metering reactor A.
4. Triggering the pneumatic valve to start: All controlled reaction vessels were selected within the PLC program. The pneumatic valves were in the normally open state. The pneumatic pump delivered liquid to the vessels. After passing through the metering reaction vessel, the metering vessel automatically read the weight within the quantitative range. When the set specified weight was reached, the pneumatic ball valve automatically closed.
5. The raw material conveying pump starts after the pneumatic valves for batching are triggered and opened one by one. When the last pneumatic valve reaches the rising edge signal, the timer is triggered to start. After 3 seconds of timing (which can be set), the pump of the raw material conveying system is started.
6. The raw material conveying and batching pump stops during the conveying process. The weighing module of the metering reactor measures the weight. When the weight measurement value reaches the weight of the raw material in the formula, the pump of the raw material conveying system stops.
7. Close the pneumatic valves for batching. After the raw material conveying batching pump stops, take the stop signal and the falling edge signal to trigger the timer to start. After 3 seconds of timing (which can be set), close the pneumatic valves for batching in sequence according to the reverse order of opening.
8. Before the raw materials are transported in the raw material reactor, an internal logical judgment should be made to determine whether the raw materials can be transported. To be transported, all the following requirements must be met: the liquid level in the raw material reactor must be higher than the minimum liquid level value, and the temperature must be above 100℃. Whether the pump P104 for conveying ingredients is in operation (it must remain stationary).
9. Selection of raw material reaction vessels and metering reaction vessels: Once the formula enters the system, the formula number is selected. The selection of metering reaction vessels starts based on the material number selected during raw material transportation.
10. Add a separate formula interface.
After the formula is selected in the target agitator tank, the formula number is displayed beside the batching tank. On the other side, all the formula names are displayed. During the feeding process of the ingredient system, the corresponding powder materials flash. After each ingredient is fed into the ingredient system, it turns green. Once all the ingredients are fed, it shows that the feeding is completed. When this reactor selects the formula again, the batching system is reset and the data is overwritten. During the batching process, this interface enables operators to see at any time which step each reactor is taking, so as to take the correct emergency measures in case of emergency.
11. The pipelines for transporting materials from the mixing workshop to the target mixing tank were rearranged. During busy periods, the batching system may receive several instructions within a certain period of time. At this point, it is necessary to consider making an interrupt at the main station and inserting instructions for priority. This requires communication and consultation with the weighing batching system for integration.
12. From the metering kettle to the production line, in the absence of any metering or liquid level monitoring in the metering tank, manual feeding should be maintained.
