Radio Frequency Identification Supervision Solution for Gas Storage Cylinders
chrispeng [ad_1]
Choosing to use the correct radio frequency identification technology is the key to the success of this project. Although there are many suppliers of basic radio frequency identification technology in the domestic market, the top three companies in terms of product standardization, technological advancement and market share are Philips, TI and Siemens. Among many radio frequency identification technologies, Philips’ Hitag® technology is a relatively advanced technology for industrial applications released by Philips in 1996, and it is also the type of technology currently used in similar applications in Europe.
Hitag®’s carrier frequency is 125KHz, and it uses excellent modulation and demodulation methods, making it particularly suitable for use in metal environments. In addition, Philips also provides us with strong technical support for the underlying hardware, so that we can directly apply its RF ASIC chip, and optimize the RF performance of the special harsh environment of the steel cylinder through the underlying optimization methods. After hard work, our radio frequency read-write unit worked stably and reliably when performing radio frequency authentication and read-write operations on the tags fixed on the cylinders, and achieved very satisfactory results. It is especially worth mentioning that in similar systems (using 13.56MHz radio frequency identification technology), the cylinder label must be supported by an unshielded structure to keep it away from the outer wall of the cylinder, supplemented by ferrite shielding means. Normal read and write. In our system, this is completely unnecessary. All tags directly fixed on the outer wall can be authenticated and read and written normally, and the connection is very reliable.
The radio frequency identification monitoring system for gas storage cylinders is a system that uses advanced radio frequency identification (RFID) technology, combined with microelectronics technology, computer technology, network technology and automatic control technology to track, manage and control gas cylinders (pressure vessels) throughout the process. Solution platform. The whole system is composed of four subsystems: technology supervision subsystem, issuance management subsystem, filling management subsystem and inspection management subsystem.
620)this.style.width=620;” border=0>
Technical Supervision Subsystem
It is built and deployed on the administrative management platform of the quality and technology supervision department. The main function is to formulate the management policy and technical benchmarks of the entire system, conduct statistical analysis of data from other subsystems, and provide support for the administrative management of the technical supervision department.
Issuance management subsystem
It can be flexibly installed and deployed in various places according to needs. Its main function is to provide issuance, production and testing support for a huge number of radio frequency tags for gas storage cylinders.
Filling management subsystem
The construction is deployed at the filling site of gas storage cylinders. Its main function is to automatically control the initial filling process of steel cylinders based on the data recorded on the radio frequency tags of the steel cylinders and the filling standard data established by the regulatory authority.
Inspection management subsystem
The construction is deployed in a designated inspection agency. The main function is to provide computerized support for the inspection of steel cylinders, and to write inspection data to the cylinder labels.
Development status and trends at home and abroad in related technical fields:
The identification technology of gas storage cylinders is different from the identification technology of general medicines, beverages and other containers, mainly in two aspects:
First, gas storage cylinders are generally placed and working in industrial sites with very harsh environmental conditions such as temperature, humidity, dirt, electromagnetics, etc., so traditional bar code, magnetic and contact identification technologies are difficult to use;
Second, in order to resist the high pressure (or negative pressure) in the bottle, the gas storage cylinders are generally steel containers, so the application effect of the conventional 13.56MHz carrier frequency radio frequency identification technology is also very unsatisfactory; therefore, this field has always been smart Blank areas of identification technology. Because it is difficult to realize the intelligent identification of individual steel cylinders, the current domestic steel cylinder filling management generally can only stay at the level of automatic weight/flow control.
At present, a few foreign developed countries such as Germany have adopted smart radio frequency tags (Philips Hitag® technology) for filling and tracking management of steel cylinders. The filling equipment can automatically determine safety science based on the information recorded by the radio frequency smart tags fixed on the cylinders. The filling parameters can automatically refuse filling for unqualified steel cylinders or illegal steel cylinders, which better solves the old and difficult problems that have been plagued by technical supervision functions. It is currently the most advantageous high-tech means for technical supervision of steel cylinders. However, these on-site control systems can only be used on assembly line filling equipment, and are completely unsuitable for manual/semi-manual filling modes that are widely distributed and existing in China, and the cost of each gun is as high as 4000 US dollars.
System technical indicators
Ø Realize tracking management during the whole life of the steel cylinder;
Ø Realize statistical analysis of filling inspection data
Ø Eliminate the use of inflatable cylinders without legal markings;
Ø Prevent the cylinders that have exceeded the scrapped life from continuing to be inflated and used;
Ø Prevent the use of cylinders that have not been inspected in accordance with the required annual inspection;
Ø Refuse to refill steel cylinders not belonging to a certain gas station at the gas station;
Ø Prevent the inflatable use of steel cylinders that fail the sampling inspection;
Ø Reject the use of inflatable cylinders that are not within the scope of this technical supervision;
Ø Legal steel cylinders are automatically filled in accordance with the filling standard to prevent over-filling, and also to prevent short-lived items;
Ø Automatically record abundant data of the whole filling process to realize the information management of the gas station;
Ø Provide the whole process weight and status display of the filling process, which is conducive to better monitoring of the process;
Ø Automatically leave a filling record on the smart label of the steel cylinder, which is convenient for the technical supervision department to conduct random inspection and analysis;
Ø Realize the peeling function of automatically removing the disturbance of gun weight, which greatly improves the filling accuracy.
Ø Realize the management of operators who log in with a certificate to reduce the hidden dangers of illegal operations;
Ø Greatly reduce the labor intensity of filling personnel and reduce labor costs.
Intelligent filling controller
Radio Frequency Protocol-Hitag®
Operating carrier frequency-125KHz
Support TAG-HT1, HT2, HTS
Sensing distance-not less than 15cm
Network protocol-CAN2.0B, network speed is not less than 62500bps
Weight sensor-standard six-wire, four-wire, RS485 instrument is optional by the user
Range —— 199.99KG
Number of divisions-20000
Modulus bit width-16 bits, support user-customized 24 bits (this item is only valid when standard four-wire or six-wire sensors are selected)
Instrument interface-RS485 protocol, the highest rate is 115200bps () (this item is only valid when RS485 instrument is selected)
Drive interface —— 2-way 1A electronic switch, support to drive 3-position two-way solenoid valve
Storage capacity-non-volatile storage of 1024 filling records, 2048 blacklists
Safety standards-GB3836.1, GB3836.2/ GB3836.4
Volume —— 170x80x30(mm)
Weight-not more than 800 g
Mobile reader
Radio Frequency Protocol-Hitag®
Operating carrier frequency-125KHz
Support TAG-HT1, HT2, HTS
Sensing distance-not less than 10cm
Communication interface-infrared, USB, RS232
Power supply-high-energy lithium-ion battery, supporting 72 hours of standby.
Volume-130x70x50
Weight —— 300g
Standard RFID reader
Radio Frequency Protocol-Hitag®
Operating carrier frequency-125KHz
Support TAG-HT1, HT2, HTS
Sensing distance-not less than 15cm
Communication interface-USB, RS232
Power supply-dedicated DC9V adapter
Weight —— 700g
Dedicated communication protocol converter
Communication protocol-RS232, CAN2.0B
Power supply-dedicated DC9V adapter
Volume —— 87x96x27(mm)
Weight —— 300g
(The products are all independently developed and produced by the company)
Radio frequency identification in a metal environment (highlights)
Choosing to use the correct radio frequency identification technology is the key to the success of this project. Although there are many suppliers of basic radio frequency identification technology in the domestic market, the top three companies in terms of product standardization, technological advancement and market share are Philips, TI and Siemens. Among many radio frequency identification technologies, Philips’ Hitag® technology is a relatively advanced technology for industrial applications released by Philips in 1996, and it is also the type of technology currently used in similar applications in Europe. Hitag®’s carrier frequency is 125KHz, and it uses excellent modulation and demodulation methods, making it particularly suitable for use in metal environments. In addition, Philips also provides us with strong technical support for the underlying hardware, so that we can directly apply its RF ASIC chip, and optimize the RF performance of the special harsh environment of the steel cylinder through the underlying optimization methods. After hard work, our radio frequency read-write unit worked stably and reliably when performing radio frequency authentication and read-write operations on the tags fixed on the cylinders, and achieved very satisfactory results. It is particularly worth mentioning that in the current similar system in Shanghai (using 13.56MHz radio frequency identification technology), the cylinder label must be supported by an unshielded structure to keep it away from the outer wall of the cylinder, supplemented by ferrite shielding means In order to achieve normal reading and writing. In our system, this is completely unnecessary. All tags directly fixed on the outer wall can be authenticated and read and written normally, and the connection is very reliable.
Technical risk analysis
If the explosion-proof performance is insufficient
The application environment of this project is a very flammable and explosive dangerous place. If the explosion-proof safety design of the equipment has hidden dangers or insufficient margin, very serious safety accidents may occur. This may be the biggest risk in the technical work of this project.
Lifeng carefully adopted the intrinsically safe circuit design form, but consciously lowered its positioning of this safety standard, treating it as a non-intrinsically safe device, supplemented by epoxy resin encapsulation. Explosion-proof and reinforced form, strive to be foolproof. At the same time, it has adopted a very rigorous and serious attitude towards the issue of equipment entering the site. All equipment must obtain a national explosion-proof certificate in accordance with the law before entering the site.
Metal environment causes degradation of radio frequency performance
The influence of the metal environment causes unreliability in the authentication and reading of the radio frequency tag fixed on the cylinder, which is a possible risk. However, due to the use of Hitag® technology from Philips, one of the world’s leading RFID manufacturers, this risk is reduced to a minimum.
The main reason is:
First of all, Hitag®’s radio frequency carrier frequency is 125KHz, which has very good inherent advantages for reading and writing in a metal environment. However, other radio frequency identification technologies with a carrier frequency of 13.56MHz (such as Mifare®) are not ideal for application in a metal environment;
Secondly, in the standard application mode of Hitag® (see Philips related technical documents), the radio frequency label and identification of steel cylinders is one of them. Moreover, it has been applied in a large area in Germany, so it is relatively mature and has low application risk.
This project adopts Hitag®, a very standardized, mature and applicable industrial radio frequency identification technology that complies with the international standard ISO15693, and uses independent intellectual property rights in the project to boldly carry out pioneering innovations, and rationally optimize them based on China’s national conditions. For some standard industrial components in the system, a reliable, direct and fast integration method is adopted to form a system with excellent product comprehensive cost-effectiveness.
[ad_2]
