Raw material automatic batching and weighing system
1. Electronic weighing system for raw material workshop
The raw material weighing and batching system of our company adopts advanced AB (Rockwell) PLC, industrial control computer and Toledo electronic weighing equipment. Fully automatic control and effective diagnosis management for weighing, mixing, conveying, etc., convenient man-machine dialogue, rich alarm function, complete historical data record, convenient call, manual, automatic and other operating modes, and can display the simulated batching line The image and production status can be automatically displayed and printed records. The electronic and mechanical equipment are designed reasonably, perfect, stable and reliable to fully guarantee the weighing accuracy.
The control system adopts the bus structure design to simplify the system and improve the reliability of the system.
Dynamic accuracy: above 200kg, large material ≤1/1000, small material ≤1/500
Static accuracy: ≤1/2000
Hardware function of raw material batching system:
The control mode of this system can be selected as fully automatic control mode, semi-automatic control mode and manual control mode.
Fully automatic control mode: In this mode, the computer is used as the host computer, and the PLC is used as a station. The start and stop of the system are controlled by the computer. The formula data is written by the computer, and the computer transmits the data to the PLC for starting the batching equipment, automatic feeding Various raw materials are weighed and checked, mixed with water and steam, and conveyed into the warehouse by belts, and the batching process is monitored and related data is processed, tabulated, and printed reports.
Semi-automatic control mode: Without a computer, the PLC can work independently. It can automatically start the batching equipment, automatic feeding and discharging, weighing and verification of various raw materials, adding water and vapor mixing, and belt conveying into the warehouse. This method cannot print orders.
Manual control mode: The console is equipped with a manual mode switch. The manual mode can be selected by the selector switch. Various equipment can be started and stopped by the manual button, starting the batching equipment, manual feeding and discharging, manual water and steam mixing, and belt conveying into the warehouse.
The batching system is a three-level redundant control system. The system is separated by modules, connected to each other, and can be separated naturally. The computer automatic method is a frequently used method. The operator only needs to press the start or stop button, and the system is All kinds of equipment will be started automatically, and batches of mixed materials will be automatically sent to the kiln head silo, with data management functions.
METTLER TOLEDO weighing instruments are designed to comply with relevant international metrology and electrical safety standards, as well as electromagnetic compatibility standards.
The weighing method adopts WIGHTOUT weighing, single-speed feeding and double-speed discharging. "Decrease method"
Also known as the second weighing method, the feeding operation is performed at a single speed first, and the feeding value must be greater than the actual formula value.
After the scale feeding operation is over, the indicator is reset to zero for discharging operation. Discharging is divided into two processes: fast discharging and slow discharging.
The fast row shortens the weighing cycle, while the slow row ensures the accuracy of the weighing.
The water adding method is called the water adding method.
The water weighing method is to calculate the required moisture value of the mixture and the measured moisture value of each raw material.
For the added water weight, fill the water weighing hopper through the fast and slow feed valve for weighing, and then feed water when the requirement is reached.
The valve is closed. The amount of water added in this way is accurate.
Raw material batching system software function
1. Weighing management
Recipe editing. Provide feeding value, moisture content, discharge value, slow discharge (feed) value of formula data,
Allowable error, editing and saving of suspended volume
Recipe download. Provide recipe data to download to the controller
Recipe printing. Recipe printing can be provided according to user needs
parameter settings. Provide the dry mixing time of the mixer, the wet mixing time of the mixer, and the discharge time of the mixer,
Intermediate bin discharge time, premix mixing time, premix discharge time, feeding time limit, discharge
Editing, saving and downloading of material over-limit time, refueling time, and water introduced by refueling.
Water measuring equipment settings. There is no choice in the use of water measuring equipment, the upper and lower limits of water fluctuations, water
Edit, save and download copies of default values.
Automatic correction of overshoot and jog feed function. Can be based on the amount of suspension set by the operator
The system is corrected by calculating the actual suspension amount, and the adopted point is set for too small suspension amount.
Dynamic replenishment has ensured accurate weighing.
Automatic compensation when the mixer adds water. Automatically adjust the mixer according to the changes in the measured sandstone moisture content
The set value for adding water.
2. System monitoring
Provide the gross weight and weighing monitoring of each scale
Provide monitoring of the working status of the mixer, pre-mixer and the opening and closing status of related doors
Provide belt working status monitoring
Provide monitoring of the feeding and discharging status of various materials
Provide mixer dry mixing, wet mixing, water adding, steaming, discharge status monitoring
3. Alarm monitoring
The system provides the following alarms:
Feed (exhaust) material is out of tolerance
Eliminate waste
The premixer door is not closed
The premixer door is not open
The door of the mixer is not closed
The door of the mixer is not opened properly
The middle door is not closed
The middle door is not opened
The belt is not opened
Feeding time is too long
Discharging time is too long
Material moisture exceeds limit
Material moisture fluctuation exceeds limit
Flap is not in place
The meter did not switch the net weight and gross weight in time
Instrument communication failure
Computer and controller communication failure
4. Real-time printing
The system provides an optional real-time printing function, which can be set by the user. If the user selects the real-time printing function
Yes, print the actual batching data of each batch after the batching is completed. Each alarm is detected in the system
The alarm data is also automatically printed after birth.
5. Historical data management
Because the system adopts standard database and Microsoft ActiveX technology, it can easily realize historical data.
According to the management of data, the system provides the following historical data management functions:
Historical alarm query: according to any time period entered by the user, historical data can be inquired and
Print.
Historical ingredient data query. The historical data can be checked according to any time period input by the user
Inquiry and print.
Data output. The historical data can be exported according to any time period entered by the user. System Support
Office system Excel and Access format export and archive.
Data deletion. The historical data can be deleted according to any time period entered by the user.
6. System authority management
The system supports multi-level permissions, and the system administrator can add or delete operators, and assign operator rights
limit.
When using the system, you must first log in to the system to prevent unauthorized users from using it.
Two, the central control DCS system of the joint workshop
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3. Various types of low-voltage power distribution cabinets, frequency conversion and soft-start control cabinets
4. Mechanical and electrical engineering installation
Installation of electromechanical equipment and electrical instrumentation system.
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