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Introduction:
Beijing Huiwangtongda Technology Co., Ltd. is a company that focuses on the research and development, manufacturing of radio frequency RFID tags and readers, and provides technical consultation, application design, installation and technical training for customers’ RFID tags and reader applications. As a company that provides services such as product warranty and maintenance, the company has experienced years of accumulation of technology development and application achievements, and has become a leading enterprise in domestic RFID reading and writing technology and products.
1. Electronic label description
Radio Frequency IDentification is RFID (Radio Frequency IDentification) technology, also known as electronic tags and radio frequency identification. It is a communication technology that can identify specific targets and read and write related data through radio signals without the need to establish a mechanism between the identification system and specific targets. Or optical contact.
With the continuous maturity of electronic label technology, it is more and more widely used in actual production and life.Such as: libraries, access control systems, food safety traceability, etc.
The electronic tag is a non-contact automatic identification technology. It automatically recognizes and obtains relevant data through radio frequency signals. The identification work does not require manual intervention. Compared with the barcode that can quickly and accurately identify and track the target object, the advantages of the electronic tag are as follows:
1) Data can be read through external materials (no visibility requirements);
2) Waterproof, anti-magnetic, high temperature resistance, can work in poor operating environment, and have a long service life;
3) Can be embedded or attached to different types of products;
4) The reading distance range has been improved, and there is no need to align and scan in a straight line;
5) The time to write data is small and the amount of stored information is large;
6) Efficient anti-counterfeiting function
7) It can read multiple cards at the same time, and can read the information on the label in motion;
8) Ultra-thin and a variety of different sizes, so that it can be packaged in paper, plastic products (PVC, PET), can be used in different occasions, and can also be laminated to make cards. Advocates of RF ID believe that the technology is being closely linked to the electronic supply chain and is expected to replace bar code scanning technology in the next few years.
2. Features of electronic tags:
1. High anti-counterfeiting technology: The data in the electronic label can reach 240bit, which is mainly divided into Resever Bank data area, EPC Bank data area, TID Bank data area and User Bank data area. Resever Bank card reader password 32bits data for setting The electronic tag reading password can be read and written.
EPC Bank 96bits data, readable and writable.
TID Bank 64bits data, a unique ID compiled by the factory
User Bank 512 bits data, user data area, readable and writable.
Since TID Bank is the factory’s unique ID and cannot be rewritten, there is actually a layer of hardware anti-counterfeiting, plus the card reading password secret code and EPC data, it can be said that the anti-counterfeiting performance is very high.
2. Small size: It can be packaged in cards the size of business cards, and various special-shaped cards, so it is very wear-resistant and strong and not easy to damage.
3. Convenient to read and write: We use ultra-high frequency (900MHz) electronic tags, which have high communication speeds. The average reading time per 32bits of reading the EEPROM data of a single tag is about 1.4 ms; the average reading time is the smallest time per 32bits when writing. 30ms. The reading distance can reach more than 10 meters. The memory can be repeatedly erased and written more than 100,000 times. Multiple tags can be recognized at the same time.
3. Introduction to the application of electronic tags in quarries
The application scheme of the electronic label of the quarry is composed of 4 parts: the collection of stone information, the weight information of the vehicle entering and leaving, the identification information of the stone leaving the factory, and the management of the terminal computer.
Stone information collection
The information of the finished stone, such as the length, width, height and weight of the stone, is written into the electronic tag through the mobile electronic tag reader, and the user information of the stone can also be stored in the tag as needed. And fix the electronic label on the stone. It is connected to the terminal computer via a wireless network to store all the stone information in the computer.
Weight information of vehicles entering and leaving
Assemble electronic tags on vehicles that transport stones, so that we can write the weight information and vehicle information when the vehicles enter and exit into the electronic tags. The daily output of stone materials and the working conditions of the vehicle can be automatically calculated through the difference in the weight of the vehicle in and out.
Ex-factory stone identification information
Since the stones are equipped with electronic tags, we can know whether the stones on the vehicle meet the requirements of the factory by inquiring the electronic tag readers through the factory goods when the stones leave the factory. For example: Is there any surplus stone, if there is less shipped stone, if there is any missing stone. When all the conditions meet the factory requirements, the access control system opens the door and sends the factory stone information back to the terminal computer. These tasks can be completed in an instant, reducing a lot of labor costs.
4. Terminal management computer
The terminal management computer is the core of the application. It comprehensively processes all data and issues corresponding operating instructions.
Including: all stone information, stone user information, stone factory information, etc. Users can know the current status of each stone at any time. Through the application of the electronic label system, the management of stone materials can be greatly improved and management costs can be saved.
Fourth, the application plan of the electronic label of the quarry
RFID composition and working principle
System composition:
The system is divided into three parts:
(1) Tag (Tag) tag is equivalent to the barcode symbol in barcode technology, used to store the information that needs to be identified and transmitted.
(2) Reader (Reader) According to the different types of tags supported and the completed functions, the complexity of the reader is significantly different. The basic function of the reader is to provide a way for data transmission with the tag. In addition, the reader also provides quite complex signal state control, parity error checking and correction functions.
(3) Antenna (Antenna) The antenna is a transmitting and receiving device that transmits data between the tag and the reader.
1. Working principle:
RFID technology is a technology that uses radio frequency signals through spatial coupling (alternating magnetic field or electromagnetic field) to achieve contactless information transmission and achieve automatic identification through the transmitted information. The working principle is: the use of radio frequency signals and spatial coupling transmission characteristics to realize automatic identification of the identified objects.
work process:
When the item with the electronic tag is within the readable range of the reader, the reader emits a magnetic field, the query signal will activate the tag, the tag requires a reflection signal according to the received query signal, and the reader receives the tag reflection back After the signal, the electronic data stored in the electronic tag is read and identified contactlessly through the decoding process of the internal circuit, so as to achieve the purpose of automatically identifying the object. And then further realize the collection, processing and remote transmission management functions of the object identification information through the computer and computer network.
2. The status quo of the quarry
At present, the management of the quarry factory mainly uses manual recording methods to manage the stone materials. This kind of work method is inefficient, heavy labor, very easy to make mistakes, and it is very cumbersome for the inventory when the personnel changes. It is even more cumbersome to look up the customer’s stone material when shipping, and it is easy to make mistakes. This not only wastes time but also increases a lot of cost.
3. Structural design and working process
(1) The structural design takes into account the production, inventory and transportation links of the quarry, so we need to install multiple electronic tag (RFID) readers and connect them to the computer in the data center through the communication line or wireless network. exchange. At the same time, it is necessary to install an electronic tag (RFID) for each stone, and enter the data for each stone’s electronic tag. The specific working model is shown in Figure 1.
It can be seen from Figure 1 that in the working process of the RFID system, energy is always the basis and data exchange is realized through a certain time sequence. The reader provides working energy to the electronic tag. When the electronic tag enters the radio frequency identification field, the radio frequency wave emitted by the reader activates the tag circuit, interacts, and completes the data exchange. For the simultaneous reading of multiple tags, either the reader or the tag can be used first. In order to realize multi-tag reading at the same time without conflict, the reader first issues isolation commands to a batch of tags, so that multiple electronic tags within the reading range of the reader are isolated, and finally only one tag is kept active and established with the reader Conflict-free communication links. For the tag-first method, the tag randomly sends its identification ID repeatedly, and different tags can be read correctly by the reader at different time periods, and multiple tags can be read at the same time. For any electronic tag, it has a unique ID number. In most applications, the data attributes of the tag are supported by the use of a back-end database. The interface between the reader and the application system is represented by a standard function called by the development tool. The functions roughly include the following aspects: the application system issues configuration commands and other instructions to the reader as needed; the reader returns its current configuration status and the execution results of various instructions to the application system.
(2) Working process
When the stone production is completed, the electronic tag (RFID) must be installed on the stone. Its chip contains a unique identification code and related information of the stone. They can be used by the reader within a certain distance in a non-contact manner. Read it out. The dynamic monitoring system based on radio frequency identification technology can simultaneously non-contact, high-speed and accurate parallel tracking and identification of multiple target objects with electronic tags within a certain range, so as long as the stone passes through the place where the reader is installed, it will Automatically read the ID numbers of the electronic tags of all stones, and then the system will transmit the ID numbers of the tags and related information of the stones to the back-end system for processing.
4. Feasibility analysis
After the previous introduction, it can be demonstrated that the digital and scientific management of stone materials is completely achievable. At the same time, the cost of RFID production is lower and the investment is less. Therefore, the stone electronic label application scheme of the stone factory is feasible.
5. The overall design of RFID technology in the quarry
(1) Functional design
The basic functions realized by RFID technology in stone material management include:
(1) The entry of the basic information of the stone includes: the length, width, height and weight of the stone.
(2) Stone management information includes: production date, customer information and shipping information.
(3) The management of stone delivery includes: delivery date, delivery address and customer, delivery quantity, etc.
(4) Management of transportation vehicles: The weight of the vehicles entering and leaving the factory can be recorded for management.
(2) Design plan
We can install RFID readers at the entrance and exit of the stone material, and at the gate of the factory. When the stone enters the warehouse, the information of the stone is automatically transmitted to the management computer through the RFID reader, and the computer will automatically register the stone in the warehouse. When the stone is out of the warehouse, the shipping information and the delivery location of the outbound stone can be written into the electronic label through the RFID reader, and the management computer is used for outbound registration. When the stone is loaded into the factory door, the RFID reader installed on the factory door will read the information of the electronic tag on the stone and judge whether it meets the requirements of the warehouse and the factory. If it meets the requirements of the factory, the factory door will automatically open , At the same time, it can export the transportation of the stone to the destination.
When an empty transport vehicle enters the factory, we can store the vehicle information on the weighbridge (including: the weight and vehicle number of the vehicle) in the vehicle electronic tag. The information input can be a handheld RFID reader or fixed RFID Write in the way of reader, transfer the information back to the management computer through the management network for archiving and management. When the vehicle leaves the factory, the weight of the vehicle on the platform scale will be compared with the weight in the RFID electronic tag when it enters the factory, and the weight difference when the vehicle enters the factory is sent back to the management computer for archiving and management. We can connect the serial port of the management computer with the serial port output of the weighbridge to realize automatic weight recording.
(3) The system is completed
The management computer center is the core of the entire system, composed of a database system and a corresponding application software system. The system can complete the management of stone material information, stone material warehousing management, stone material customer demand management, and transportation vehicle import and export management. For example, you can query the stone production and stone shipment information on a certain day.
6. Concluding remarks
The application of RFID in the stone material factory can realize the digital and scientific management of the stone material, which not only reduces the management cost, but also improves the management efficiency.
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