Laundry management system based on RFID radio frequency identification technology
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The system discussed in this article is based on the high frequency 13.56 MHz of RFID radio frequency identification technology. It can greatly improve the management efficiency of industrial laundry enterprises for the current centralized, large-scale and industrialized laundry factories and their service targets such as hospitals and hotels. , To reduce the error rate in the management process, and ultimately achieve the purpose of effective management and management to promote production.
1 The working principle of the system
When the system is working at the RFID high-frequency 13.56 MHz operating frequency, the communication between the electronic tag and the RFID reader is generally carried out through inductive coupling, that is, the inductive magnetic field is used for energy transfer and data exchange. The principle is the same as that of the transformer, as shown in the figure below. The RFID reader antenna generates an electromagnetic field, and the electronic tag antenna induces a voltage through the electromagnetic field to provide energy for the electronic tag to work.
The radio frequency interface circuit mainly realizes the following 4 functions:
(1) Obtain the energy required for the tag to work from the magnetic field of the RFID reader.
(2) When the RFID electronic tag just enters the electromagnetic field range of the RFID reader, a power-on reset signal is generated to reset the entire tag system.
(3) Separate the clock signal from the radio frequency signal of the RFID reader for use by the RFID electronic label system.
(4) The data signal is demodulated from the radio frequency signal of the RFID reader, and the signal generated by the RFID electronic tag is modulated and fed back to the RFID reader.
The digital control circuit includes the following parts:
(1) The encoding/decoding circuit realizes two functions: one is to decode the data from the data demodulated by the radio frequency interface circuit; the other is to encode the data that the RFID electronic tag needs to send and send it to the modulation in the radio frequency interface circuit. Circuit modulation.
(2) Data integrity detection circuit. Transmission errors may occur in the transmission of data from the RFID electronic tag reader to the RFID electronic tag. The CRC check generation circuit is responsible for detecting whether the data is correct.
(3) Command decoding circuit, RFID electronic tags use many commands, such as read commands, write commands, and lock commands. The instruction decoding circuit is responsible for deciphering the command, command identification and command parameters from the frame.
(4) Instruction execution circuit.
(5) System control circuit.
The storage circuit includes an EEPROM storage module and an EEPROM interface circuit. EEPROM is used to store data in RFID electronic tags. The EEPROM interface circuit is responsible for operations such as address decoding and reading and writing.
2 System structure
Combining with RFID high-frequency radio frequency identification technology, a system can be developed. By sewing RFID electronic tags on linen and uniforms, the number of washing times of clothes can be counted, and the points can be scanned quickly and in batches, which greatly reduces the number of users. When checking the dirt, because there is no need to unpack, thus avoiding cross-infection and other problems.
2.1 Hardware configuration
(1) Server. Mainly used to install and run server-side software and database software. The code in the relevant RFID electronic tag and its corresponding information are also stored in the server.
(2) Computer. It is used to collect the RFID electronic tag information received through the reader antenna, and transmit the information package to the server for storage and backup in real time by means of synchronous update.
(3) RFID electronic tags. It is sewn on each piece of clothing or linen as the only identifying mark of that piece of clothing or linen. Each electronic label has a unique code to avoid duplicate records. In addition, the code is stored in the server, and it is read and recorded every time it is washed, and it can record the number of washing times, washing time, and washing location of the piece of clothing or linen.
(4) RFID reader. Can read/write RFID electronic tags for registering clothes or linen. After the electronic tag is sewn on the clothing or linen, the clothing or linen can be registered. Utilize the read/write operation of YX9091T reader to record the RFID electronic tag code and corresponding clothing/linen type, fabric type, size, color, brand, washing process and other related information on the server through the computer for preparation Called every time you wash.
(5) Clothing counts the tunnel. The clothing inventory tunnel integrates the RFID reader and antenna with the tunnel. When clothes or linen sewn with RFID electronic tags pass through the tunnel, it can be read through the RFID reader and its antenna integrated on the inner wall of the tunnel. The information carried in the electronic tag storage area is transmitted to the computer through the data cable, and the computer transmits the clothing information through the network to the server for backup through the real-time update.
Currently, there are roughly two types of clothing inventory tunnels for different delivery methods:
1) Manual clothing inventory tunnel. Mainly for small batches of clothing or linen, a single or a few pieces of clothing are delivered. The main advantage of the tunnel is that it is small and flexible and easy to install. It is easy to use for the clothes receiving and dispatching personnel. It can achieve the effect of putting clothes or linen on-the-go, saving waiting time and counting time. However, the disadvantage is that the tunnel has a small diameter and cannot meet the delivery requirements of large quantities of clothes.
2) Conveyor belt type clothing inventory tunnel. The clothing counts the tunnel. Mainly for large quantities of clothing or linen, because the automatic conveyor belt is integrated, only the clothing is placed at the entrance of the tunnel, and the clothing can be brought to the exit through the tunnel through the automatic conveyor belt. At the same time, the quantity is counted through RFID high-frequency technology. The advantage of this channel is that the tunnel has a large diameter, which can accommodate large quantities of clothes or linen to pass through at the same time. For the clothes receiving and dispatching personnel, it can eliminate the actions of unpacking, placing, and counting, which greatly improves work efficiency.
2.2 Software configuration
The management software independently developed for the RFID laundry management system includes the following functions:
(1) Clothing registration. This function consists of a card issuing machine and a registration function module. When unregistered clothing arrives, the registrant writes the user and clothing information into the RFID electronic tag storage area through the card issuer, and at the same time transmits the information to the server for storage and backup.
(2) Inventory of clothing. This function is composed of RFID reader YX9091T and inventory function module. When the clothes pass through the clothes throwing channel, the RFID reader/writer transmits the received RFID electronic tag information to the personal computer, and performs fast, efficient and accurate counting through the counting function module. After the inventory is completed, the system will automatically generate a form containing the clothing summary information, which can be printed out with a receipt printer and signed as a stub.
(3) Clothing query. This function is composed of a clothing query function module. You can query the status of the clothes, such as the clothes being washed or on the shelf, and so on. Can provide detailed data for staff and managers. If necessary, you can print or transfer the query data to Excel format.
(4) Collection statistics. This function is composed of statistical modules. Statistical data can be based on conditions such as time, customer category, etc., to provide a basis for decision makers. When necessary, the statistical data can be printed and transferred to Excel format.
(5) Customer management. This function is constituted by the customer management module. It can list the different needs of various customers and the types of laundry, can efficiently manage customer groups, and provide good tools for users to manage customers.
(6) System settings. This function completes the system management of system equipment configuration, language, clothing type, setting of administrators and operators, and passwords.
2.3 System structure
Web environment
3 System workflow
The consignee receives the laundry from the customer to be washed and confirms whether the RFID electronic tag is sewn. If not, sew an RFID electronic tag on the clothes to be washed, and then register the clothes information through the RFID card issuing machine YX9037USB-L and the registration module. The registered clothes go through the RFID clothes counting tunnel to quickly, accurately and efficiently count the number of clothes to be washed, and print the information summary bill to the customer and the receiver to sign and confirm the stub. After the inventory, the clothes to be washed enter the washing process. At the same time, the system checks whether the washing times of the clothes to be washed and the washing times of the electronic tag carried are beyond the expiration date. If the above conditions exist, the clothes need to be scrapped or the electronic tag needs to be replaced and re-registered . After washing, the clothes are sorted and packaged, and the number is counted through the tunnel again and the receipt is printed. After confirmation, the batch of clothes is sent to the delivery point. When the customer picks up the clothes, they will check the bill printed when they are sent for washing with the bill for counting after washing provided by the consignor. After confirming the number of clothes and the information is correct, the customer picks up the clothes.
4 Conclusion
The system discussed in this article applies RFID high-frequency radio frequency identification technology to the identification and management of clothing or linen. Based on RFID high-frequency technology, an efficient work platform for fast collection, counting and taking of clothes in the laundry industry is realized. At the same time, by quickly counting the washing times of clothes or linens, they can be scrapped and replaced in time, which greatly improves work efficiency and reduces errors. Rate.
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