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1. System structure
The system adopts a master-slave structure and uses Ethernet to realize the transmission of actual data. The system is divided into five major systems:
-RFID identification system
-Infrared positioning system
-Video surveillance system
-Audio and video prompt system
-Data processing system
1. RFID identification system
The RFID identification system is the main system and runs through the entire control process. RFID radio frequency identification technology is used to automatically identify the electronic tag of the vehicle as the basis for data processing. The RFID identification system consists of a radio frequency card (also called an electronic tag), a tag reader and an antenna.The tag reader/writer emits a certain frequency radio frequency signal, when carryingelectronic labelWhen the vehicle enters the working area of the transmitting antenna, an induced current is generated, and the radio frequency card obtains energy and is activated; the radio frequency card transmits its own encoding and other information through the built-in transmitting antenna of the card; the system receiving antenna receives the carrier signal sent from the radio frequency card through the antenna The regulator is sent to the reader, and the reader demodulates and decodes the received signal and then sends it to the background main system for related processing; the main system judges the validity of the card according to logical operations, and makes corresponding processing for different settings And control, send out command signals to control the action of the actuator.
2. Infrared vehicle positioning system
1) Function and role: to prevent cheating when vehicles are not fully weighed; two vehicles are weighed and tare cheated at the same time. If the vehicle is not fully weighed or two vehicles weighed at the same time, the infrared vehicle positioning system will automatically detect and prohibit weighing; the vehicle is not stopped after being weighed, and weighing is prohibited; only the vehicle is fully weighed normally and the system is stopped. Weighing is allowed.
2) Infrared to the radio controller
Function and role: Detect the signal of the infrared reflector and supply power to the infrared reflector. Each controller communicates with 2 sets of infrared reflectors through the 485 interface, and transmits the monitoring signal to the computer in real time. If it is detected that the weighing is not complete or two vehicles are weighing at the same time, the system automatically prohibits weighing.
3) Infrared transmitter and bracket
Function and role: A total of two sets of infrared beamers are installed on both ends of the electronic platform scale to monitor the vehicle’s weighing status in real time, and transmit the monitoring signals to the infrared beamer controller for processing in real time.
3. Video surveillance system
The video monitoring system realizes the real-time collection of the video data of the weighing process, and the real-time monitoring of the weighing process, and can realize the remote monitoring and recording function.
4. Audio and video prompt system
The audio-visual prompt system is used to display the entire operation process, prompt the driver how to operate, and can display the processed data such as load.
5. Data processing system
This is the core of the entire system. It reads the signal of each device and sends out control instructions to record the weighing data of the vehicle.
At the same time, the system has the conversion between automatic operation and manual operation. During automatic operation, card reading, positioning, weighing, recording, electronic screen display, and recording are all automatically completed. When necessary, you can switch to manual control, manually enter the ID number, manually lift the lever, and manually enter the data. When a certain link fails, the entire system can still run.
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