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RFID design scheme of coal mine data acquisition system

chrispeng December 6, 2021 Mining Safety

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1 Overview

1.1 System overview

The coal mine data acquisition system is an important part of the coal mine information system. It mainly realizes the real-time acquisition, processing and storage of coal and its transportation vehicles and personnel data, and transmits the data to the remote system back-end to provide real-time support for the system back-end Dynamic information of various coal mine sites.

As part of the daily work of coal mines, it is particularly important to improve the efficiency of data collection for coal and its transportation vehicles and personnel. The coal mine data collection system can automatically complete the collection and processing of these data without manual intervention, preventing misoperations and errors during manual operations, and can effectively improve the production efficiency of the coal mine.

1.2 Overview of RFID

Radio Frequency Identification (English: Radio Frequency Identification, abbreviation: RFID) is a wireless communication technology that can identify specific targets and read and write related data through radio signals without requiring mechanical or optical contact between the identification system and specific targets.

The radio signal is an electromagnetic field tuned to a radio frequency to transmit data from the tag attached to the item to automatically identify and track the item. The tag obtains energy from the electromagnetic field emitted by the reader during identification, and does not require a battery. The label contains electronically stored information and can be identified within a few meters. The RFID tag does not need to be in the line of sight of the reader and can be embedded in the tracked object.

The radio frequency identification system attaches the tag to the object to be identified. The reader sends a radio wave signal to the tag and interprets its response. Readers generally transmit the information they receive to a computer system that contains radio frequency identification middleware or radio frequency identification software.

2. System function

2.1 Automatic data collection function

The system automatically collects various required data without manual intervention to prevent misoperation during manual operations. The information collected by the system includes:

① Weighing information: the total weight of the vehicle and coal weighed by the floor scale;

② Vehicle information: vehicle number, that is, the unique number of the vehicle in the system, which is bound to the license plate number;

③ Personnel information: Personnel number, that is, the unique number of the person in the system;

④ Equipment information: equipment number, that is, the unique number of the collection equipment in the system;

⑤ Collection time: the specific time when the data was collected;

2.2 RFID remote intelligent identification function

Using UHF (UHF, 915Mhz) RFID radio frequency identification technology, it can automatically read vehicle information and personnel information at a relatively long distance without manual intervention.

Write personnel information and vehicle information into electronic tags, and place the electronic tags in a fixed position on the transport vehicle. When the vehicle enters the radio frequency field of the system, the system automatically reads vehicle information and personnel information.

2.3 GPRS wireless data transmission function

At this stage, the GPRS network has the largest network coverage, basically covering the whole country. The GPRS network can transmit the collected data to the system background in real time.

After each weighing is completed, the system will synchronize the collected data to the remote system background via the GPRS wireless network in real time. The background of the system can monitor the data of each coal mine in real time.

In the case of a communication failure with the remote system backend, the system will automatically store the collected data to the internal storage system, and wait until the communication is restored before transmitting it.

2.4 Intelligent voice prompt function

Because there is no human intervention, intelligent voice prompts are used as a necessary means to assist the normal operation of the system.

In order to ensure the normal operation of the system and improve the efficiency of weighing, the system prompts the personnel what operation should be carried out under which state through voice. Of course, the system will automatically complete all the work, but the cooperation of personnel is required.

The system voice prompts are as follows:

① Prompt when the vehicle arrives: “Please stop the vehicle and weigh it!”

② After the vehicle stops stably, it prompts: “Vehicle number: XXXXXX, now start weighing…”

③ After the weighing is completed, the prompt: “Vehicle number: XXXXXX, total weight: XXX.XXX tons. The weighing is completed, thank you!”

2.5 LED large screen display function

The system displays prompt information, vehicle information, and weighing information in real time on a large screen.

① When the vehicle arrives, it displays: “Please stop the vehicle and weigh it!”

② After the vehicle has stopped, it will display: “Vehicle number: XXXXXX, now start weighing…”

③ After the weighing is completed, it will display: “Vehicle number: XXXXXX, total weight: XXX.XXX tons. Weighing is complete, thank you!”

2.6 Data storage function

The system can store the collected information to deal with various emergencies, such as sudden power outages, communication failures, etc.

The storage system functions are as follows:

① Data will not be lost after power off. All collected data is stored in the data storage system in the system, and will not be lost due to power failure of the equipment.

② Communication failures are automatically recorded. When the communication with the remote data terminal fails, the system automatically records the event of the failure, and transmits the unsent data to the background of the remote system after the communication is restored.

3. System structure

3.1 System structure block diagram

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3.2 System flow chart

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4. Software system

4.1. System composition

The mine resource vehicle management system adopts Rfid and Gprs technology to realize the weighing management of mining vehicles. The system structure is shown in Figure 1.

Figure 1 System structure diagram

4.2, data collection

After the truck is weighed, the terminal controller automatically collects the platform scale data (weight), and automatically collects the vehicle information (Rfid tag); after the collection is completed, it is displayed on the electronic display screen, and the data is automatically uploaded to the server to realize vehicle weighing and other management.

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