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1. Background description
With the rapid development of cities, the need for efficient and information-based construction sites is becoming more and more urgent. In the complex and fast-paced construction environment of construction sites, the management of personnel attendance is particularly important. The attendance of construction site personnel has certain particularities: first, the flow of people is large; second, the education level of most workers is low; third, the frequency of staff changes is relatively fast. Therefore, the attendance system for entry and exit personnel at construction sites has special requirements: first, large capacity, secondly, convenient operation, and lastly, the system update procedure should be simple and fast. The working hours of construction site personnel are not fixed, and the work cycle is not fixed. Workers do not understand or accept the overly complex attendance process. At the same time, information statistics are difficult, and the uncertainty of construction site work time and construction period brings many difficulties to the later work of attendance information statistics.
The traditional construction site management model relies on manual records. The management of personnel is cumbersome and complicated, and the management intensity is high. At the same time, it is prone to errors, inaccurate data registration, and difficult to query. Managers cannot quickly and accurately grasp the attendance time and management Difficulty and high cost.
Information-based construction site management urgently needs the intervention of modern management methods to realize automated, real-time, and accurate collection of the attendance of construction site personnel, and achieve more scientific management of the site for leaders. RFID wireless radio frequency identification technology originated in the Second World War and has been developed for decades. In recent years, due to the vigorous promotion of Sichuan Kailuwei Electronics Co., Ltd., the application of RFID has become more extensive and diversified, and the application is also More and more mature, especially UHF RFIDTechnology, long reading distance, smaller tags, lower cost, fast recognition speed, and strong multi-tag recognition capabilities are widely used in various fields such as storage, transportation, assets, and personnel management. It has successfully saved a lot of manpower and time for enterprises, improved operational efficiency, and reduced operating costs, making it gradually become the mainstream technology for wireless automatic identification applications.
This solution will be based on UHF RFID technology and propose a set of automated attendance management systems suitable for construction site personnel to help management companies realize automated, real-time and accurate management of personnel attendance.
2. UHF RFID system
The UHF RFID system uses the principle of radar reflection. The reader sends a microwave inquiry signal to the electronic tag through the antenna. The electronic tag is activated by the microwave energy of the reader. After receiving the microwave signal, it responds and sends out an echo signal with the tag data information. . The basic feature of radio frequency identification technology is to use radio technology to identify stationary or moving objects, to determine the identity of the object to be identified, and to extract the characteristic information (or identification information) of the object to be identified.
The characteristic information of the object to be identified collected through the radio frequency identification system is usually processed by middle software first, or the collected identification information is directly processed through computer information processing technology (such as database technology, etc.) and computer network technology (Intranet & Internet). Technology) Realize the integration, sharing, and long-distance transmission of information to directly serve related business application systems (such as: personnel management, access control systems, item/asset tracking, warehousing/logistics management, etc.).
3. The overall scheme design of the system
3.1 System overall design drawing
Install UHF RFID card readers in the entry and exit passages of the construction site, and paste the self-adhesive RFID passive electronic tags into the safety helmets of the construction workers, and automatically complete the sign-in or sign-out when wearing the safety helmets in and out of the passage. The main software and hardware of the system include: RFID card reader, RFID desktop card issuer, several RFID electronic tags, 1 set of management software, and several auxiliary materials such as network cables. UHF RFID technology has the advantages of being able to read multiple tags at one time, strong penetrability, multiple read and write, large data memory capacity, low cost of passive electronic tags, small size, convenient use, high reliability and long life, etc. Features.
3.2 Label installation
In this system, workers entering and leaving the construction site must wear safety helmets. Therefore, the safety helmet can be used as a medium in this system. The access control channel with RFID identification system can complete the identification of attendance personnel.
3.3 Access control channel
Install RFID identification equipment at the gates entering and exiting the construction site. When workers wearing safety helmets pass by, the electronic tags bound on the safety helmets are identified to realize the identification of attendance personnel.
In the design of this system, the key lies in the simultaneous identification of multiple people entering and exiting at the access control channel, especially for wider gates. During the peak attendance hours, the flow of people is large, and the device needs to have the ability to not miss reading of multiple tags.
3.4 Display system
The LED display shows the real-time number of people entering and exiting each type of work (if specific personnel information is written, the personnel information can be displayed). At the same time, managers can conveniently view the real-time personnel attendance status through APP or WeChat official account.
4. System architecture process
The construction worker and the engineering party sign a labor service contract. The engineering party conducts necessary pre-job training for the workers, collects personnel photos, establishes files (names, ID numbers, electronic photos, etc.) in the reader management system, and assigns RFID tags. Paste a self-adhesive RFID passive electronic tag in the helmet of the construction worker. When the operator wears a helmet when entering and exiting the channel, the fixed card reader automatically recognizes the electronic tag, and completes the sign-in or sign-out.
4.1 Label initialization
The RFID blank tag itself does not represent anything, so the first task of the RFID application system is to associate the RFID tag with a unique ID number with the actual goods one by one, and bind the ID of the tag to the identity of the person. Get up, so that every person has his own unique identity accordingly.
4.2 Attendance Information Management
Through RFID technology, the system can collect the data of personnel entering and leaving the construction site in time to make the data timely and accurate. The management of basic attendance information can be formed, and the attendance table can be inquired.
4.3 Safety warning
For illegal entry of people without a card, the system will automatically give an early warning. At the same time, records of rewards and punishments for employees and units, classified registration of safety incidents, and inquiries and statistics on them. Warn of violations exceeding the number of violations set by the system. Severe ones can enter the blacklist.
4.4 Relevant permission assignment
Construction sites can be assigned the authority to handle the construction personnel card, and the construction personnel can be issued electronic tags and report the loss through the management system; construction personnel must go to the designated management office to apply for electronic tags and perform identity registration and other data backup.
4.5 Time Attendance Rules Management
Different companies can set corresponding attendance rules according to their own specific conditions and systems, add data to the basic rule table, and modify the basic rule table. Set the basic commuting time and the number of swiping cards, as well as corresponding rules for being late, leaving early, and working overtime.
4.6 Statistical query
Provide effective management methods and various projects for project management based on the data generated from employment records, salary payment records, attendance records, training records, safety accident records, rewards and punishment records, meal records, attendance queries, accident queries, training queries, etc. Management reports.
5. Hardware equipment selection
The application of RFID technology in bank cash drawer management, by loading RFID electronic tags on the cash drawer, it has a unique identification mark, and the tag information is obtained through the RFID reader to provide basic data for the refined management of the cash drawer support.
In this application system, the accuracy of RFID data collection is very important, and its core equipment is the channel reader and mobile collection equipment.
5.1 Fixed reader
Fixed readers are mainly deployed at the entrance and exit of construction sites to collect the identity information of construction workers entering and exiting.
KX822OUT is a four-channel UHF RFID reader. It has a high-speed reading capacity of 750 tags/sec. It can be connected to 4 antennas at the same time to work. It has a wider coverage and fast data collection without missing reading. . At the same time, KX822OUT has super anti-interference ability and can adapt to various complex indoor and outdoor industrial environments.
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