UHF RFID Reader
RFID is a simple wireless system with only two basic components that is used to control, detect and track objects. The system consists of an interrogator (or reader) and many transponders (or tags). RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. RFID technology can identify high-speed moving objects and identify multiple tags at the same time, making the operation quick and convenient.
RFID solutions are RFID application solutions developed by RFID technology suppliers based on industry development characteristics and can be "tailor-made" according to the actual requirements of different enterprises.
RFID solutions can be classified according to industry, logistics, anti-counterfeiting and anti-theft, identification, asset tracking management, animal tracking management, fast payment, personnel management, healthcare management, oil and gas industry technology, railway management system, supply chain management, library management system and so on.
RFID logistics solutions
Radio frequency identification can be used to track and manage almost all physical objects, so it can be widely used in various industries. Typical applications include:
(1) Supply chain and logistics management
(2) Manufacturing and assembly
(3) Baggage, mail and parcel handling
(4) Identity recognition, anti-counterfeiting, access control and anti-theft systems
(5) Document tracking/library management
(6) Traffic management and urban planning
(7) Service experience and CRM
(8) Spatial positioning and tracking
(9) Ubiquitous computing
1 Objects and tasks
1.1 Warehouse management objects
The main body of warehouse management is the warehouse administrator, and its management objects include:
(1) Inventory: items stored in the warehouse, which are the fundamental objects of warehouse management; inventory is divided into three forms according to their existence: pallet, box and bulk. Limited by RFID, it is not suitable to manage every small item. A single item, so the unit for using RFID to manage items is the entire box and the entire pallet (including large items);
(2) Storage location: A non-overlapping area in the warehouse used to place inventory items. Generally, multiple inventory items can be placed in one storage location; a larger inventory item can also occupy several storage locations. .
(3) Warehouse management equipment: Equipment used for warehouse management, such as forklifts, trolleys, etc.; in large and busy warehouses, these equipment need to be reasonably scheduled and positioned in real time to improve equipment utilization.
1.2 Tasks of warehouse management
The main tasks of warehouse management are:
(1) Warehousing (incoming goods inspection)
(2) Outbound (picking)
(3) Warehouse transfer (replenishment)
(5) Generate various inventory reports as needed
2 Overall design
2.1 Basic idea
(1) Attach an electronic label to each storage location, which is called a storage location label. When performing warehouse management operations, reading the tag number can determine whether the location of the current operation is correct.
(2) When items are put into storage, an electronic label is attached to each inventory management item. This label is a cargo label. Labeled items should be pallets, boxes, or large items that can be easily labeled. When performing warehouse operations, read the tag number to determine whether the items are correct. To save running costs, cargo labels are designed to be reused. Remove the goods when they leave the warehouse and send them to the warehouse for reuse.
(3) Set up a wireless network to cover the entire warehouse operation area and transmit all operation data in real time. Fixed wireless data terminals are installed on forklifts, and manual workers are equipped with handheld wireless data terminals. The wireless data terminal has functions such as accepting operation instructions, confirming whether the operation location and operation goods are accurate, and returning the actual operation status.
(4) Use the AGV (Automatic Guided Vehicle) as a platform, and install RFID readers, control equipment, and wireless communication equipment on it. AGV vehicles equipped with reader equipment automatically inventory the warehouse at set times every day and transmit the inventory results to the system management center.
2.2 System architecture
The warehouse management system is designed using the following three-tier architecture:
The first layer is Capture, which mainly collects data through radio frequency identification equipment and other automatic identification equipment, including storage location labels, cargo labels, wireless data terminals, AGV vehicles, etc.;
The second layer is movement, which uses wireless communication technology to transfer the collected data to the central database, including wireless access equipment and related network equipment.
The third layer is management, which manages the collected data, including database servers, network servers and other equipment and warehouse management system software.
3 system composition
The warehouse management information system consists of three parts:
(1) Warehouse management center subsystem
Responsible for the centralized management and maintenance of the warehouse management database, responsible for the formulation of purchase plans and outbound plans and the issuance of instructions; printing and generating various management reports.
(2) Warehouse management on-site subsystem
Issue warehousing labels, perform real-time inventory management (location management), and issue warehouse management operation instructions through the wireless network.
(3) Warehouse management execution subsystem
Complete the specific operations of warehousing, warehouse removal, warehouse transfer, inventory inventory and other operations, and return to the execution status.
4 system information flow
The information flow of the system is as follows:
5 operation process
5.1 Production and installation of storage location labels
Unless the location is adjusted or the label is damaged, generally the location label only needs to be produced and installed once. The steps are as follows:
* Code the location first
* Use the warehouse management on-site subsystem computer and RFID reader to write the location code and other information into the electronic tag;
* Use a label printer to print location code text and barcode information on paper labels;
* Attach paper labels to electronic labels to generate location labels;
* Install the location label on the location. It is required to be installed firmly to prevent it from falling off; and the labels are required to be installed as uniformly as possible on the support beam directly below the storage location.
5.2 Warehousing operation process
(1) Receipt inspection
Key points to check:
* Whether the delivery order is consistent with the order form;
* Whether the actual goods received are consistent with the delivery order;
If it does not match, reject it.
(2) Make and paste labels
The specific method is as follows:
* Use the selected item coding scheme to code inbound items;
* Make cargo labels: Write the coded information into the electronic label, print the paper label at the same time (to facilitate manual verification), and then glue the paper label and the electronic label together to become the cargo label.
* Fix tags on inventory items: Considering the high cost of tags, in order to facilitate the recycling of electronic tags, hanging tags are generally fixed to items. If it is not recycled, it can be fixed by pasting.
(4) The on-site computer automatically allocates storage locations and gradually downloads the storage location number and corresponding item number for each operation to the wireless data terminal (handheld terminal or forklift terminal);
(5) The operator transports the goods to the designated warehouse location, checks the location and then sends the goods into the warehouse location (if necessary, modify the cargo number and quantity information recorded in the warehouse location label);
(6) The wireless data terminal sends the live warehousing status to the on-site computer and updates the inventory database in a timely manner.
5.3 Outbound operation process
The outbound operation process is shown in Figure 1:
(1) The central computer issues the outgoing plan;
(2) The on-site computer compiles the outbound instructions and downloads them to the data terminal;
(3) Operators follow the data terminal prompts and arrive at the designated warehouse location;
(4) Take out the specified quantity of goods from the storage location and rewrite the content of the storage location label;
(5) The goods are transported to the exit and the goods labels are removed;
(6) Send back the completed outbound operation information to the on-site computer;
(7) Update the central database.