The RFID application scheme of the possible cold chain logistics turnover box
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At present, in the available cold chain logistics, from the completion of the collection to the loading, a business process of rechecking the turnover box needs to be completed in the middle. The main function of the turnover box review is to check whether the number of turnover boxes on the store’s storage space is correct, whether any turnover boxes belonging to the store are not in the store’s storage space, and the turnover boxes that do not belong to the store are in the store’s storage space. On the storage position. This process requires reviewers to scan all the turnover boxes once. If a store has a large number of turnover boxes, the time required is considerable, which may result in failure to load and ship in time after the collection is completed. So, how can we improve the efficiency and accuracy of the turnover box review, and ensure that after the collection is completed, and the car?
1.Brief introduction
The bottleneck of improving the efficiency of turnover box review is mainly caused by barcode technology.As we all know, when recognizing a bar code, the scanner must be aligned with the barCode, and can only read the group bar code at a time. However, Radio Frequency Identification (RFID) technology can overcome the above-mentioned shortcomings in barcode applications.
RFID mainly reads or writes RF]D tag information through radio frequency. Therefore, not only the reading distance can be close or far, but also a large number of RFID tags can be read at the same time.More importantly, RFID can
Penetrate the object and identify the RFID tag placed inside the object. Therefore, compared with bar codes, RFID has a very large technical advantage.
2.application solution
The basic RFl D system consists of three parts: RFl D tag (Tag), RFID reader (Reader) and application support software.
2.1 The choice of RFID tag
RFID tag (Tag) is composed of chip and antenna (Antenna), each tag has a uniqueElectronic code. The tag is attached to the object to identify the target object.
RFID tags are divided into two types: Active and Passive according to different ways of sending radio frequency signals. Active tags actively send radio frequency signals to the reader, usually powered by a built-in battery, also known as active tags; passive tags do not have batteries, also called passive tags, which emit radio waves and the energy required for internal processor operation Electromagnetic waves generated from the reader. After the passive tag receives the electromagnetic wave signal from the reader, it converts part of the electromagnetic energy into energy for its own work.
Among them, the active tag usually has a longer communication distance, and its price is relatively high, and it is mainly used in application fields such as long-distance detection of valuables. Passive tags have the advantage of relatively low prices, but their working distance and storage capacity are limited by energy sources.
Since the working distance is within 2 meters in the available cold chain logistics application, the storage capacity requirement is not too large, so passive RFID tags can be used.
2.2 Selection of frequency band
The choice of operating frequency is a key issue in the application of RFID technology. It not only affects the performance and size of the tag, but also affects the price of the tag and reader.
There are multiple frequency bands in the RFID operating frequency, and different frequency bands have their own advantages and disadvantages.At present, the working frequencies of RFlD applied to the logistics turnover box mainly include high frequency 13.56Mhz and ultra-high frequency UHF.Kind of frequency band.
The reading distance of high frequency RFID is relatively short, generally no more than 1.5 meters, but the ability to read tags through objects is relatively strong, while the reading distance of UHF RFID is relatively long, generally 3-9 About meters, but the penetrating ability is relatively poor.
For cold chain logistics, because the middle distance of the warehouse door is about 2 meters, and there is no need to penetrate the turnover box and various commodities, the UHF portal antenna with a reading distance of about 3-9 meters is used.
2.3 RFID and turnover box
The RFID label processed by the self-adhesive packaging method can be affixed to a place that is not easy to be hit on the surface of the turnover box, so that it can be quickly and accurately identified by an RFID reader. Considering that the turnover box may hit the RFID tag attached to the surface during the handling process, which will cause the label to be damaged, we can embed the RFID tag in the turnover box, because RFID uses radio wave recognition technology, which can pass through The turnover box reads the embedded RFID tag data.
In addition, in order to ensure the normal reading of the turnover box information when the RFID tag is damaged, the following two methods can be used:
1) Paste the ordinary bar code on the surface of the turnover box, the turnover box can also be identified by the barcode:
2) RFID is not affixed to the turnover box, but is detachably tied to the turnover box.
2.4 Information recognition
But the cold chain logistics needs to be in a short time. Quickly and accurately read a large number of turnover boxes with RFID tags. Therefore, in actual application, we use the array antenna group (ultra high frequency) method to ensure fast and accurate reading.
When the staff pulls a trailer turnover box and passes, the system automatically reads the passed RFID tags and transmits them to the back-end server for processing in real time via the RS485 network. After the back-end server receives the RFID information, it displays the turnover box information represented by these RFIDs on the electronic billboard in a timely manner.The staff only needs to look at the electronic billboard and confirmJust click the number of scans.If it is found that the number of scans is incorrect, the staff needs to re-open the trailer
After a while, so that the RFID can be scanned again. If there is a need for mobile scanning, such as verifying the information of the turnover box, it can be read through a handheld RFID data terminal.
The biggest advantage of using RFID to identify the turnover box is that it can read out the turnover box information of a cage at one time. Compared with scanning the bar codes one by one, it greatly saves time and labor costs.
3.Feasibility cost analysis
RFID tag cost analysis is the key to the success of commercial applications. The cost of RFID tags is mainly composed of IC chips, antennas, and packaging (the following are all 96-bit tags). According to data, the average price of passive high-band tags in 2003 was 91 cents, and now it is around 50 cents. If the volume exceeds 100,000, it can be reduced to 10 cents. With the advancement of integrated circuit technology and the expansion of application scale, the cost of RFID tags will continue to decrease. According to the forecast of the Auto-ID Center, in the case of mass production, the production cost of RFID tags can be reduced to as low as 5 cents, of which the IC chip is about 1-2 cents, and the antenna is about 1 cent.
In addition, the cost of RFID readers is also one of the factors affecting RFID applications. Because the RFID system has huge technical advantages, it will bring about a substantial increase in work efficiency, thereby reducing the overall cost of the system, so that the cost of using RFID is also worthwhile.
RFID system application promotion also involves the transformation of existing business systems. It is now possible to use RFID for the review of the turnover box, so only need to change the review method, the change to the business process is quite small, but the time used for the review will be greatly reduced.
4.Concluding remarks
It is estimated that the use of RFID in the review of the turnover box of the cold chain logistics will reduce the time spent on the review of the turnover box by at least half without major adjustments in the business process, thereby enabling the completion of the collection to the end of the loading The interval is greatly shortened, and the time for logistics to transport the goods to the store will also be advanced, which will increase the number of cold chain distribution stores and bring greater profits to the enterprise. On this basis, the RFID technology can also be extended to the use of the turnover box of the normal temperature logistics, and then the RFID technology can be used to further replace the bar code technology.
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