Application scheme of RFID technology in AGV site positioning navigation and dispatching system
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To understand the application of RFID in AGV automatic transport vehicles, we must first understand what AGV is. AGV trolley refers to a transport vehicle equipped with electromagnetic or optical automatic guidance devices, capable of traveling along a prescribed guidance path, with safety protection and various transfer functions. As an unmanned industrial handling vehicle, high-speed, high-efficiency and accurate positioning are very important for the AGV trolley transportation system. RFID has the advantages of non-contact and non-line-of-sight. Using RFID to control the positioning of the AGV trolley, compared to other positioning methods (inertial positioning, ultrasonic positioning, laser positioning, etc.) is not only simple in structure, low in cost, but also easier to implement and accurate positioning.
The specific application of Jianyong RFID technology in AGV site positioning navigation and dispatching system
Automation, informationization, and intelligence have become the needs of the development of the times. Since entering the 21st century, wireless technology and computer technology have continued to develop in depth, and the Internet of Things industry is booming. RFID radio frequency identification is a non-contact automatic identification technology, which automatically recognizes the target object and obtains related data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. With these characteristics of RFID, the use and value of RFID positioning technology integrated in AGV are very great.
A method of using RFID in AGV
The AGV is controlled by PLC, and the car has a wireless communication system that can communicate with the upper computer wirelessly, report its running position and working status, execute the instructions of the upper computer, and transmit the working beat and workload to the upper computer in time; the AGV uses RFID Read the ground signs and make corresponding actions (change speed, select track, position and stop, etc.); AGV card reader JY-L8900 is installed under the AGV body, and RFID landmark card JY-T330 is installed at the node position on the ground, and Assign an ID number and definition to the landmark card on each node. For example, at node A, the AGV needs to select the track to turn, which is represented by ID number 00001. Once the transport vehicle passes through the point A, the AGV card reader will read the point A According to the electronic tag ID number of the PLC, the PLC will make the trolley take corresponding actions based on the read data, so as to realize the function of the AGV dispatching system and the station positioning function. As shown in the figure:
Schematic diagram of the application of RFID positioning technology in AGV
The PLC can control the car according to the pre-set program, or upload the data to the upper computer, and then control the car according to the instructions of the upper computer.
Second, the advantages of long-distance high-speed RFID positioning technology of Jianyong Technology
⑴Strong penetrability, can easily penetrate the object to read the label without affecting the reading distance;
⑵Strong anti-interference, other frequency band technologies are susceptible to environmental humidity, noise, oil pollution, electromagnetic fields, strong vibrations and other factors. It is easy to read unstable cards and cause data packet loss or inability to read labels, while Jianyong AGV card readers are not easy to accept Interference can avoid these problems;
⑶The card reading distance is moderate and stable. To achieve accurate parking, the AGV sensor (ie card reader) must have a stable and reasonable card reading distance. Reading distance too close means that the AGV chassis needs to be very low, which undoubtedly increases the equipment failure rate; too far reading distance means inaccurate positioning, the robot has read the tag and stopped before the station, and Jianyong AGV card reader JY-L8900 can be accurately controlled at 5-10cm. For some special requirements, the card reading distance can also be set to 15-20cm;
⑷The card reading speed is fast, and the stable reading speed of the label is more than 2 m/s. When the AGV is accelerating, the reader will not be able to read the electronic label without the ordinary RFID reader;
JY-L8900 is a high-speed and long-distance RFID card reader independently developed by Guangzhou Jianyong Information Technology Co., Ltd. It supports FDX-B and EMID format tags, compatible with 125K, 134.2K, and stably reads tags at a speed of 2 meters per second or more. The distance is more than 15cm, which is almost twice as long as the reading distance of ordinary RFID low-frequency technology. In addition, it has high stability, extremely low error rate, no missed reading, long-term use, no drift, high reliability, high protection level, automatic tuning and other characteristics, which can automatically adapt to the general industrial environment, and it is very suitable for application to AGV robots;
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