Code reading positioning system based on RFID

Abstract

A code reading positioning system based on RFID can avoid mutual electromagnetic interference as much as possible, a card generates electric energy through a radio frequency signal and replies own ID information, and an RFID read head transmits the signal to a PLC for subsequent processing after receiving the ID information of the card, and is suitable for a scene with at least one travelling unit on an electroplating production line.

Description

Technical Field

[0001] The present invention relates to a code reading and positioning system, in particular to an RFID-based electroplating vehicle code reading and positioning system. Background Art

[0002] RFID barcode reading and positioning systems are advanced positioning solutions based on radio frequency identification technology, designed specifically for industrial automation. They are particularly suitable for demanding environments such as anodizing, surface treatment, and electroplating vehicles. Compared to traditional binary barcode reading positioning methods, RFID technology, with its superior performance and reliability, has become the preferred solution for electroplating vehicle positioning systems. The table below compares the parameters of binary barcode reading and RFID barcode reading positioning, demonstrating the clear technical advantages of RFID-based positioning systems.

[0003] Figure 1 and Figure 2 The schematic diagram of the existing vehicle code reading and positioning system using binary code reading and positioning is shown. Taking the electroplating production line as an example, a general production line has many stations (or slots), each station has a unique code, Figure 1 The figure shows a situation with 6 stations. Through the station coding and the station sensor located above the station, the vehicle can be moved to any designated position by reading the identification code when moving left or right. In this technical solution, many sensors are required because binary coding is used. Each station is detected by a sensor. In this way, the maximum number of codes using 6-bit sensors is as high as 36 (the square of 6). For this reason, Figure 2 The idea of installing sensors on the carriage is proposed. In this way, three sensors are used on one carriage to add and subtract counts for forward and backward movement, which greatly reduces the number of sensors. However, in this solution, due to the reduction of sensors, once a sensor error occurs or an error occurs in the station sensor, all subsequent counting actions will be disordered. Therefore, there is a solution in the prior art to install three sensors and an RFID card reader on the carriage at the same time, and install an RFID card on the station. Figure 3As shown, three sensors are installed on the carriage for simple addition and subtraction counting when moving left and right, completing the most basic slot positioning. An RFID card reader is also installed on the carriage; when the carriage moves to the top of each slot, the card reader can read the RFID card installed above the slot, each card has a unique ID number; when the carriage is ready to move, it first reads the ID card on the current slot, reads the real slot number corresponding to the ID from the database, converts the read ID number into the real slot number, and compares the slot number with the count value on the current sensor addition and subtraction counter. If the real number does not match the counter (counting error), the real number is used. The slot number reinitializes the counter value to complete the self-calibration process; movement begins only after calibration is complete, and the sensor is used to simply add and subtract counts during the movement. For example, if you want to move to slot No. 10, the movement stops when the counter count reaches 10; when it stops, the ID card on the target slot is read again for verification. If the target slot is not No. 10 when verified by the ID card, it proves that an error occurred during the counter movement. It may be a sensor failure, or it cannot sense a certain slot. At this time, the slot number obtained by the real ID lookup table is reset, and then the car is driven to the target position (expected to be slot No. 10) with the latest position. In this solution, although the uniqueness of the RFID card number can be used for precise positioning, the production line runs stably, eliminating dependence on sensors, and the actual application is stable and reliable. The positioning error rate is basically 0, and the sensor count and RFID card are mutually verified. However, in reality, during electroplating processing, there are far more than six stations and more than one crane. When multiple robotic arms (cranes) are required to move simultaneously, electromagnetic interference will be generated between RFID cards, and the crosstalk signals transmitted and received by the RF antenna will seriously affect the driving stability. At this time, wiring layout will also become a problem.

[0004] However, in the prior art, there is an urgent need for an RFID-based code reading and positioning system applicable to at least one driving unit that can avoid mutual electromagnetic interference as much as possible. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, the present invention aims to provide an RFID-based code reading and positioning system suitable for an electroplating production line with at least one crane unit, which can avoid mutual electromagnetic interference as much as possible, wherein the card generates electrical energy through radio frequency signals and replies with its own ID information, and after the RFID reader receives the ID information of the card, it transmits the signal (the IO signal is consistent with the original sensor method) to the PLC for subsequent processing.

[0006] Specifically, according to one aspect of the present invention, there is provided an RFID-based code reading and positioning system, comprising an RFID radio frequency transceiver unit installed on each of at least one driving unit for transmitting data signals collected by each driving unit and receiving main control signals, a code reading unit for reading codes, and a wireless control board for data acquisition and control, wherein the RFID radio frequency transceiver unit is electrically connected to the code reading unit and the wireless control board, and each of the multiple driving units is jointly configured with a main control box with a built-in PLC and a data acquisition control board, which controls the movement of the multiple driving units by sending main control signals, the PLC is provided with a serial port 1, and the data acquisition control board is provided with a serial port 2, and the two communicate serially through the RS232 standard, and an RFID transceiver unit electrically connected to the data acquisition control board is also provided in the main control box, for transmitting and receiving wireless signals from the RFID radio frequency transceiver unit, so that the PLC receives data from each driving unit of the data acquisition control board and transmits control instructions to each driving unit, thereby controlling the movement of each driving unit by wireless transmission.

[0007] According to the above-mentioned code reading and positioning system, it is characterized in that, as a card, the RFID radio frequency transceiver unit generates electrical energy through radio frequency signals and replies with its own ID information. As an RFID reader, the RFID transceiver unit receives the card's ID information and transmits the signal (the IO signal is consistent with the original sensor method) to the PLC for subsequent processing, thereby realizing code reading and positioning of the vehicle.

[0008] According to the above-mentioned code reading and positioning system, it is characterized in that when the positioning card enters the reader sensing range of 0-4 cm, the card generates electricity through the radio frequency signal and replies with its own ID information.

[0009] According to the above-mentioned code reading and positioning system, it is characterized in that the sensing range is 2 to 3 centimeters.

[0010] According to the above-mentioned code reading and positioning system, it is characterized in that the RFID transceiver unit and the RFID radio frequency transceiver unit installed on each traveling vehicle form a one-to-many wireless communication, and a single-point PLC can synchronously / asynchronously wirelessly control each traveling vehicle unit.

[0011] According to the above-mentioned code reading and positioning system, it is characterized by being equipped with a dedicated mobile burner that supports automatic burning function. Starting from the card at station No. 1, each time the operator moves to the position of the next station card, he only needs to press a button once to trigger the burning of the next station card.

[0012] According to the above-mentioned code reading and positioning system, it is characterized in that the burner has a built-in reader to automatically identify the station number and verify the station sequence.

[0013] According to the above-mentioned code reading and positioning system, it is characterized in that a short press of the button triggers a single burning instruction, and the system automatically completes the current position burning and data verification.

[0014] According to the above-mentioned code reading and positioning system, it is characterized in that a long press of the button triggers an emergency pause command, interrupts the burning process and pops up an exception handling menu.

[0015] According to the above-mentioned code reading and positioning system, it is characterized in that each time a station is burned, an encrypted record is automatically generated to achieve burning encryption.

[0016] According to the above-mentioned code reading and positioning system, it is characterized in that the duration of pressing the button once is 3 seconds.

[0017] The positioning method according to the above-mentioned code reading and positioning system is characterized in that it includes the following steps: (1) RFID communication: The RFID reader continuously sends radio frequency signals. When the positioning card enters the reader's sensing range of 0-4 cm, the card generates electricity through the radio frequency signal and responds with its own ID information. (2) Signal processing: After the RFID reader receives the ID information of the card, it transmits the signal to the PLC for subsequent processing.

[0018] According to the present invention, the following obvious core advantages are achieved: 1. Excellent environmental adaptability The RFID reader adopts a high protection level design and can withstand corrosive environments such as acids and alkalis, ensuring long-term stable operation under harsh working conditions and significantly extending the service life of the equipment.

[0019] 2. Strong anti-interference ability The built-in pull-up circuit design effectively resists electromagnetic interference, ensures the accuracy and stability of signal transmission, and avoids misreading or missed readings caused by interference.

[0020] 3. Long sensing distance and stable signal The sensing distance is as long as 4CM, far exceeding the traditional binary code reading method, effectively avoiding positioning failures caused by partial failure of the sensor or signal loss, and ensuring the continuity and reliability of system operation.

[0021] 4. Easy installation and debugging, low maintenance cost The RFID code reading and positioning system adopts a modular design, which makes the installation process simple and fast, and significantly shortens the commissioning time. Its high stability and low failure rate significantly reduce maintenance costs and improve equipment operation efficiency.

[0022] 5. Ultra-fast response speed The response speed is as high as 1 millisecond (1ms), which can achieve near real-time data transmission and positioning feedback, and is particularly suitable for high-paced and high-intensity industrial automation scenarios.

[0023] 6. Avoid mutual electromagnetic interference and form one-to-many wireless communication A single-point PLC can synchronously / asynchronously wirelessly control each crane unit, minimizing mutual electromagnetic interference. It is suitable for industrial automation scenarios with at least one crane unit on an electroplating production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a traditional electroplating production line in the prior art is shown.

[0025] Figure 2 The schematic diagram of the vehicle code reading and positioning system in the conventional electroplating production line in the prior art using binary code reading and positioning is shown.

[0026] Figure 3 A schematic diagram of a vehicle-mounted code reading and positioning system based on RFID code reading and positioning in a conventional electroplating production line in the prior art is shown.

[0027] Figure 4 A schematic diagram of a vehicle code reading and positioning system based on RFID code reading and positioning according to a specific embodiment of the present invention is shown.

[0028] Reference numerals: 1~6: Positions 1~6; 11~16: Traffic from 11 to 16; 21~26: RFID radio frequency transceiver units No. 1~6; 31~36: Wireless control panels No. 1~6. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in combination with specific embodiments with reference to the accompanying drawings. Those skilled in the art will appreciate that the description is illustrative and the present invention is not limited to the specific embodiments.

[0030] Figure 4 A schematic diagram of a vehicle code reading and positioning system based on RFID code reading and positioning according to a specific embodiment of the present invention is shown.

[0031] like Figure 4As shown, the code reading and positioning system of the present invention includes an RFID radio frequency transceiver unit 21 to 26 installed on each of at least one driving unit (the figure shows six driving units numbered 1 to 6), which is used to transmit data signals collected by each driving unit and receive main control signals, a code reading unit (not shown) for reading codes, and a wireless control board 31 to 36 for data acquisition and control. The RFID radio frequency transceiver unit 21 to 26 is electrically connected to the code reading unit and the wireless control board, and each plurality of driving units (for example, a group of three driving units) is jointly configured with a built-in PLC and a data acquisition control board. The board's main control box controls the movement of the multiple crane units 1-6 by sending master control signals. The PLC is equipped with serial port 1, and the data acquisition and control board is equipped with serial port 2. The two communicate serially via the RS232 standard. The main control box also houses an RFID transceiver unit electrically connected to the data acquisition and control board. This unit transmits and receives wireless signals from the RFID transceiver unit, enabling the PLC to receive data from each crane unit on the data acquisition and control board and transmit control instructions to each crane unit, thereby wirelessly controlling the movement of each crane unit. As a card, the RFID transceiver unit generates electricity from radio frequency signals and responds with its own ID information. As an RFID reader, after receiving the card's ID information, the RFID transceiver unit transmits the signal (the IO signal is consistent with the original sensor method) to the PLC for subsequent processing, thereby achieving code reading and positioning of the crane.

[0032] Preferably, when the positioning card enters the reader's sensing range of 0-4 cm, the card generates electricity through radio frequency signals and responds with its own ID information. Further preferably, the sensing range is 2-3 cm.

[0033] According to the present invention, the RFID transceiver unit forms a one-to-many wireless communication with the RFID radio frequency transceiver unit installed on each traveling vehicle, and a single-point PLC can synchronously / asynchronously wirelessly control each traveling vehicle unit.

[0034] According to the present invention, a dedicated mobile burner with automatic burning is equipped. Starting with station card number 1, the operator simply presses a button each time they move to the next station card position to trigger burning of the next station card. In a preferred embodiment, the burner has a built-in reader to automatically identify the station number and verify the station sequence. If the station sequence is incorrect or jumps, the burner is reprogrammed to the correct station or the vehicle is stopped for inspection based on the verification results.

[0035] Preferably, a short press of the button triggers a single burn command, and the system automatically completes the burn and data verification for the current station. Further preferably, a long press of the button triggers an emergency pause command, interrupting the burn process and popping up an exception handling menu. Even more preferably, after each burn is completed, an encrypted record is automatically generated to implement burn encryption. In a preferred embodiment, the long press of the button lasts for 3 seconds.

[0036] The code reading and positioning system according to the present invention includes the following steps when performing code reading and positioning: (1) RFID communication: The RFID reader continuously sends radio frequency signals. When the positioning card enters the reader's sensing range of 0-4 cm, the card generates electricity through the radio frequency signal and responds with its own ID information. (2) Signal processing: After the RFID reader receives the ID information of the card, it transmits the signal to the PLC for subsequent processing.

[0037] According to the present invention, a single-point PLC can synchronously / asynchronously wirelessly control each crane unit, which can avoid mutual electromagnetic interference as much as possible. It is suitable for industrial automation scenarios with at least one crane unit on an electroplating production line.

[0038] The present invention has been described in detail above in conjunction with specific embodiments. Those skilled in the art will understand that various changes and modifications may be made. As long as they do not depart from the spirit and purpose of the present invention, these changes and modifications should fall within the scope of protection of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A code reading and positioning system based on RFID, characterized in that: It includes an RFID radio frequency transceiver unit installed on each of at least one driving unit for transmitting data signals collected by each driving unit and receiving main control signals, a code reading unit for reading codes, and a wireless control board for data acquisition and control, wherein the RFID radio frequency transceiver unit, the code reading unit and the wireless control board are electrically connected, and each of the multiple driving units is jointly configured with a main control box with a built-in PLC and a data acquisition control board, which controls the movement of the multiple driving units by sending main control signals, the PLC is provided with serial port 1, and the data acquisition control board is provided with serial port 2, and the two communicate serially through the RS232 standard, and an RFID transceiver unit electrically connected to the data acquisition control board is also provided in the main control box, which is used to transmit and receive wireless signals from the RFID radio frequency transceiver unit, so that the PLC receives data from each driving unit of the data acquisition control board and transmits control instructions to each driving unit, thereby controlling the movement of each driving unit by wireless transmission.

2. The code reading and positioning system according to claim 1, characterized in that: As a card, the RFID radio frequency transceiver unit generates electrical energy through radio frequency signals and replies with its own ID information. As an RFID reader, the RFID transceiver unit receives the card's ID information and transmits the signal to the PLC for subsequent processing, thereby realizing code reading and positioning of the vehicle.

3. The code reading and positioning system according to claim 2, characterized in that: When the positioning card enters the reader's sensing range of 0-4 cm, the card generates electricity through radio frequency signals and responds with its own ID information.

4. The code reading and positioning system according to claim 3, characterized in that: The sensing range is 2 to 3 cm.

5. The code reading and positioning system according to claim 1, characterized in that The RFID transceiver unit forms a one-to-many wireless communication with the RFID radio frequency transceiver unit installed on each traveling vehicle, and a single-point PLC can synchronously / asynchronously wirelessly control each traveling vehicle unit.

6. The code reading and positioning system according to any one of claims 2 to 5, characterized in that: Equipped with a dedicated mobile burner that supports automatic burning function, starting from station card No. 1, each time the operator moves to the next station card position, he only needs to press a button once to trigger the burning of the next station card.

7. The code reading and positioning system according to claim 6, characterized in that: The burner has a built-in reader to automatically identify the station number and verify the station sequence.

8. The code reading and positioning system according to claim 6, characterized in that: Short press the button once to trigger a single burn command, and the system will automatically complete the current station burn and data verification.

9. The code reading and positioning system according to claim 6, characterized in that: Long press the button once to trigger the emergency pause command, interrupt the burning process and pop up the exception handling menu.

10. The positioning method according to the above-mentioned code reading and positioning system is characterized in that: The steps include: (1) RFID communication: The RFID reader continuously sends radio frequency signals. When the positioning card enters the reader's sensing range of 0-4 cm, the card generates electricity through the radio frequency signal and responds with its own ID information. (2) Signal processing: After the RFID reader receives the ID information of the card, it transmits the signal to the PLC for subsequent processing.

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