CN210234991U - Railway wagon number automatic identification device based on RF-ID - Google Patents
Railway wagon number automatic identification device based on RF-ID Download PDFInfo
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- CN210234991U CN210234991U CN201921007591.XU CN201921007591U CN210234991U CN 210234991 U CN210234991 U CN 210234991U CN 201921007591 U CN201921007591 U CN 201921007591U CN 210234991 U CN210234991 U CN 210234991U
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Abstract
The utility model provides a railway freight car number automatic identification equipment based on RF-ID, its characterized in that: it includes: a microcontroller, which is the control center of the device; the vehicle trigger signal and uplink and downlink judgment signal acquisition module is connected with the external magnetic steel equipment at the input end and is used for acquiring a vehicle trigger signal at the output end; the radio frequency module is connected with the microcontroller and is used for sending radio frequency signals; the power supply circuit is connected with the microcontroller and supplies power to the device; and the communication interface is connected with the microcontroller and realizes communication with an external network.
Description
Technical Field
The utility model relates to a railway freight car discernment technical field especially relates to a railway freight car number automatic identification equipment based on RF-ID.
Background
In the eighth and ninety years of the last century, in order to implement effective control over the running of trucks on a seventy thousand kilometers railway line, thirty thousand train operators exist on railways in China, and no matter in the daytime, at night, in the daytime, in the summer, in the winter, in the spring, in the summer and in the autumn, the serial numbers of each train are recorded by a traditional operation mode of speaking notes, and then the serial numbers are manually reported to a transportation management department step by step. The traditional work mode of recording the car number has the advantages of high labor intensity, low work efficiency and high error rate. Railroad operators are constantly searching for and exploring techniques and methods that will automatically transcribe truck numbers. The image recognition, the surface acoustic wave technology and the infrared ray technology … … cannot adapt to the severe working environment of the railway and all-weather working conditions. More importantly, the laggard basic information acquisition mode is seriously mismatched with the modernization of the operation management system, so that a plurality of information management systems built on the sandy beach by the China railway are not like being built on the sandy beach, and the development of the modernization of the railway operation management is greatly restricted.
Until 1992, China does not start to contact automatic equipment identification based on a Radio Frequency Identification (RFID) technology, the technology can be used for automatically identifying the number of a railway train, and in 2000, the Ministry of railways invests four hundred million multi-element implementation railway number automatic identification system engineering in one period, 40 ten thousand freight trains in the whole country are provided with electronic tags, 1 ten thousand locomotives are additionally provided with locomotive electronic tags, and 2000 sets of ground identification equipment are arranged in main large stations and marshalling stations of the railway in the whole country.
The train number recognition device realizes automatic recognition of the train number of the railway, trains are automatically collected through the system to be marshalled at stations and demarcation stations, and vehicles are automatically tracked through the system at the marshalling stations, so that the train number recognition device is quick, convenient and timely, and the railway transportation management efficiency is greatly improved.
When a train is about to enter a station, a first wheel of the train starts counting when the first wheel of the train passes through the starting magnetic steel, and the microwave radio frequency device is started (the microwave radio frequency device keeps a closed state when no train passes) when the first wheel of the train is more than or equal to 6 times. After the microwave radio frequency device is started, the ground antenna arranged on the track starts to work, and transmits microwave carrier signals to the RFID tag at the bottom of each carriage of the rapidly-sagging train to provide energy for the tag to start to work. The tag encodes information in the tag through an encoder under the control of a microprocessor, and controls a microstrip antenna through a modulator to start reflecting the information to the ground; the ground antenna immediately receives the reflected information in the label and transmits the information to a detection machine room beside the railway; demodulating, decoding, processing and distinguishing the received modulated wave signal by an unattended ground reading computer (industrial personal computer) in the machine room; and then the processed information is sent to a centralized management system of a station machine room. And when the wheel of the last carriage of the train presses the magnetic closing door steel, the radio frequency device is closed.
However, the car number acquisition mode often has the following problems:
1. the ground antenna sends the car number label data to the machine room through the feeder, and the feeder is not suitable to be too long in a conventional state due to the fact that the feeder attenuates radio frequency signals. The feeder cable is generally required to be not more than 30-50 meters in a good reading state, which brings great limitation to machine room construction and equipment installation.
2. When the first wheel of the train presses the opening magnetic steel, the train number recognition device triggers the antenna gain, and when the wheel of the last carriage of the train presses the closing magnetic steel, the radio frequency device is closed. However, in a general state, the door closing magnetic steels, that is, the door opening magnetic steels symmetrically installed, have a good distinguishing effect on the continuously moving station entrance and exit and intervals, but when train inspection is performed in some operation areas where the train inspection is stopped and moved at non-uniform speed at the tail end of some freight transport stations or in marshalling stations, good antenna gain triggering cannot be achieved.
3. Part of the car number identification devices always rely on a computer (industrial personal computer) to demodulate, decode, process and judge the received modulated wave signals, so that the space and the complexity of equipment deployment are greatly increased.
4. Generally, a car number recognition device only has a serial data transmission mode, and information transmitted to an upper-level processing system or a centralized management system is always forwarded by other equipment or uploaded through processing software of a computer (industrial personal computer).
Disclosure of Invention
The utility model aims to overcome prior art's is not enough, adapts to reality needs, provides a railway freight car number automatic identification equipment based on RF-ID that circuit structure design is novel.
In order to realize the utility model discloses a purpose, the utility model discloses the technical scheme who adopts does:
an automatic wagon number identification device based on RF-ID is designed, and is characterized in that: it includes:
a microcontroller, which is the control center of the device;
the vehicle trigger signal and uplink and downlink judgment signal acquisition module is connected with the external magnetic steel equipment at the input end and is used for acquiring a vehicle trigger signal at the output end;
the radio frequency module is connected with the microcontroller and is used for sending radio frequency signals;
the power supply circuit is connected with the microcontroller and supplies power to the device;
and the communication interface is connected with the microcontroller and realizes communication with an external network.
The communication interface comprises a USB interface, an RS232 communication interface and an RJ45 network interface which are all connected with the microcontroller.
The vehicle trigger signal and uplink and downlink judgment signal acquisition module comprises an acquisition chip, and a magnetic steel trigger on the rail is connected with the microcontroller through the acquisition chip; the in-phase input end A and the in-phase input end B of the acquisition chip are connected with a magnetic steel trigger on the rail through interfaces, and the output end Ro, the output end RE and the output end DE of the acquisition chip and the driver input end DI of the acquisition chip are connected with the microcontroller.
The radio frequency module comprises a radio frequency DAC signal reconstruction filter circuit, a radio frequency DAC biasing circuit and a gain circuit which are sequentially connected in series.
The radio frequency DAC signal reconstruction filter circuit comprises two filter circuits, each filter circuit comprises an inductor L and a capacitor C which are connected in parallel, the two filter circuits are connected in series, the input end of the filter circuit at the front end is connected with an inductor RT1, the input end of an inductor RT1 is the input end of the radio frequency DAC signal reconstruction filter circuit and is connected with the microcontroller, and the output end of the inductor RT1 is also grounded through a capacitor C3;
the two filter circuits are grounded through a capacitor C4, the output end of the filter circuit at the rear end is connected with the input end of the radio frequency DAC biasing circuit, the output end of the filter circuit at the rear end is grounded through a capacitor C5, and meanwhile, the output end of the filter circuit at the rear end is grounded through a resistor RT 2.
The radio frequency DAC bias circuit comprises an amplifier U1, the reverse input end of the amplifier U1 is connected with the output end of the radio frequency DAC signal reconstruction filter circuit through a resistor R5, and the non-inverting input end of the amplifier U1 is connected with a reference voltage; meanwhile, the inverting input terminal of the amplifier U1 is connected to the output terminal of the amplifier U1 through the resistor R6, the output terminal of the amplifier U1 is connected to the resistor R7, and the output terminal of the resistor R7 is the output terminal of the rf DAC biasing circuit and is connected to the gain circuit.
The beneficial effects of the utility model reside in that:
compared with the gain of a common wagon number automatic identification device, the wagon number automatic identification device based on the RF-ID has the advantages that:
1) the design adopts a hardware triggering and protocol instruction triggering comprehensive delay triggering mechanism to perfect a triggering mechanism of the antenna gain of the car number recognition device, greatly improves the effect of the antenna gain, and meets the more complicated car number recognition during the motion of the car.
2) The product is light in design, equipment is not required to be installed in a machine room, and the equipment can be easily deployed only by using the equipment cabinet near the antenna, so that the problems of space and complexity of equipment deployment caused by the dependence of the equipment on a computer (industrial personal computer) are solved.
3) In the communication mode, the product realizes simultaneous data transmission in three modes of USB, RS232 and TCP, provides richer transmission modes for vehicle number data acquisition, and particularly brings great convenience for the equipment Internet of things management and long-distance deployment in the TCP transmission mode.
4) The product also supports double uplink and downlink judgment channels, four paths of magnetic steel are triggered, the antenna supports two paths of expansion, and double-track car number identification and double-track access identification of certain tail end operation can be realized.
Drawings
FIG. 1 is a block diagram of the overall structure of the RF-ID-based wagon number automatic identification device
FIG. 2 is a schematic circuit diagram of a vehicle trigger signal and an uplink and downlink judgment signal acquisition module in the device;
FIG. 3 is a schematic diagram of a RF DAC signal reconstruction filter circuit of the present apparatus;
FIG. 4 is a schematic diagram of the RF DAC biasing circuit of the present apparatus;
fig. 5 is a schematic diagram of a gain circuit in the present device.
Detailed Description
The invention will be further described with reference to the following figures and examples:
example 1: an automatic identification device for the wagon number based on RF-ID is disclosed, and refer to figures 1 to 5.
It includes:
a microcontroller, which is the control center of the device;
the vehicle trigger signal and uplink and downlink judgment signal acquisition module is connected with the external magnetic steel equipment at the input end and is used for acquiring a vehicle trigger signal at the output end;
the radio frequency module is connected with the microcontroller and is used for sending radio frequency signals;
the power supply circuit is connected with the microcontroller and supplies power to the device;
and the communication interface is connected with the microcontroller and realizes communication with an external network.
Specifically, the communication interface comprises a USB interface, an RS232 communication interface and an RJ45 network interface which are all connected with the microcontroller.
The vehicle trigger signal and uplink and downlink judgment signal acquisition module comprises an acquisition chip max3485, and a magnetic steel trigger on the rail is connected with the microcontroller through the acquisition chip max 3485; the in-phase input end A and the in-phase input end B of the acquisition chip max3485 are connected with a magnetic steel trigger on a rail through an interface P6, and the output end Ro, the output end RE and the output end DE of the acquisition chip max3485 and the driver input end DI of the acquisition chip are connected with the microcontroller.
The radio frequency module comprises a radio frequency DAC signal reconstruction filter circuit, a radio frequency DAC biasing circuit and a gain circuit which are sequentially connected in series.
Specifically, the radio frequency DAC signal reconstruction filter circuit comprises two filter circuits, the first filter circuit comprises an inductor L1 and a capacitor C1 which are connected in parallel, the second filter circuit comprises an inductor L2 and a capacitor C2 which are connected in parallel, the two filter circuits are connected in series, wherein the input end of the first filter circuit at the front end is connected with an inductor RT1, the input end of the inductor RT1 is the input end of the radio frequency DAC signal reconstruction filter circuit and is connected with the microcontroller, and the output end of the inductor RT1 is grounded through the capacitor C3; the two filter circuits are grounded through a capacitor C4, the output end of the second filter circuit at the rear end is connected with the input end of the radio frequency DAC biasing circuit, the output end of the second filter circuit at the rear end is grounded through a capacitor C5, and meanwhile, the output end of the filter circuit at the rear end is grounded through a resistor RT 2.
The radio frequency DAC bias circuit comprises an amplifier U1, the reverse input end of the amplifier U1 is connected with the output end of the radio frequency DAC signal reconstruction filter circuit through a resistor R5, and the non-inverting input end of the amplifier U1 is connected with a reference voltage; meanwhile, the inverting input terminal of the amplifier U1 is connected to the output terminal of the amplifier U1 through the resistor R6, the output terminal of the amplifier U1 is connected to the resistor R7, and the output terminal of the resistor R7 is the output terminal of the rf DAC biasing circuit and is connected to the gain circuit.
In the circuit, the gain circuit can be any gain circuit in the prior art, the circuit uses the gain circuit shown in fig. 5, as shown in the figure, the input end of the input matching network is connected with the output end of the radio frequency DAC biasing circuit, the output end of the output matching network is the output end of the whole gain circuit, and the radio frequency antenna is connected to the output port RFOUT of the output end of the gain circuit.
The automatic train number identification device based on the RF-ID mainly comprises a hardware system and an embedded application program, wherein the hardware system mainly comprises a vehicle trigger signal acquisition circuit, a vehicle passing information acquisition circuit, a vehicle trigger gain signal acquisition circuit, a vehicle uplink judgment signal acquisition circuit, a vehicle downlink judgment signal acquisition circuit, a vehicle trigger gain signal acquisition circuit, a vehicle downlink judgment signal acquisition circuit, a vehicle external trigger gain signal acquisition circuit, a vehicle uplink judgment signal acquisition circuit, a vehicle external trigger gain signal acquisition circuit, a vehicle downlink judgment signal acquisition circuit, a specific protocol acquisition circuit and a specific protocol acquisition circuit. On the one hand, the data are transmitted through a serial port and a USB, on the other hand, the data are transmitted through an Ethernet, so that the data can be read by a centralized processing system installed in a short distance, and the data can also be communicated with a remote monitoring platform to transfer the data, and the data are simultaneously connected in a supporting manner, so that great convenience can be brought to vehicle number data acquisition.
The microcontroller consists of STM32 chip and its core peripheral circuit, and controls antenna gain of the car number identifying device, identifies car number, judges the up and down direction of the car, and exchanges data with the upper system or centralized processing system via communication interface.
Specifically, the vehicle trigger signal and uplink and downlink judgment signal acquisition module uses a 485 circuit to connect with an external magnetic steel device and is used as a vehicle trigger signal and uplink and downlink judgment signal acquisition circuit,
the radio frequency module can be matched and identified with the radio frequency module carried by the vehicle when the vehicle passes by, and the information such as the vehicle number and the like is identified through the microcontroller.
The microcontroller identifies the number and other information of the current passing railway wagon according to the vehicle trigger signal, the data information sent by the uplink and downlink judgment signal acquisition module and the radio frequency module and an internal pre-implantation algorithm.
Compared with the gain of a common wagon number automatic identification device, the wagon number automatic identification device based on the RF-ID has the advantages that:
1) the design adopts a hardware triggering and protocol instruction triggering comprehensive delay triggering mechanism to perfect a triggering mechanism of the antenna gain of the car number recognition device, greatly improves the effect of the antenna gain, and meets the more complicated car number recognition during the motion of the car.
2) The product is light in design, equipment is not required to be installed in a machine room, and the equipment can be easily deployed only by using the equipment cabinet near the antenna, so that the problems of space and complexity of equipment deployment caused by the dependence of the equipment on a computer (industrial personal computer) are solved.
3) In the communication mode, the product realizes simultaneous data transmission in three modes of USB, RS232 and TCP, provides richer transmission modes for vehicle number data acquisition, and particularly brings great convenience for the equipment Internet of things management and long-distance deployment in the TCP transmission mode.
4) The product also supports double uplink and downlink judgment channels, four paths of magnetic steel are triggered, the antenna supports two paths of expansion, and double-track car number identification and double-track access identification of certain tail end operation can be realized.
The embodiment of the present invention discloses a preferred embodiment, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention according to the above embodiment, and make different extensions and changes, but do not depart from the spirit of the present invention, all of which are within the protection scope of the present invention.
Claims (6)
1. The utility model provides a railway freight car number automatic identification equipment based on RF-ID which characterized in that: it includes:
a microcontroller, which is the control center of the device;
the vehicle trigger signal and uplink and downlink judgment signal acquisition module is connected with the external magnetic steel equipment at the input end and is used for acquiring a vehicle trigger signal at the output end;
the radio frequency module is connected with the microcontroller and is used for sending radio frequency signals;
the power supply circuit is connected with the microcontroller and supplies power to the device;
and the communication interface is connected with the microcontroller and realizes communication with an external network.
2. The automatic identification device of railway wagon number based on RF-ID as claimed in claim 1, wherein: the communication interface comprises a USB interface, an RS232 communication interface and an RJ45 network interface which are all connected with the microcontroller.
3. The automatic identification device of railway wagon number based on RF-ID as claimed in claim 1, wherein: the vehicle trigger signal and uplink and downlink judgment signal acquisition module comprises an acquisition chip, and a magnetic steel trigger on the rail is connected with the microcontroller through the acquisition chip; the in-phase input end A and the in-phase input end B of the acquisition chip are connected with a magnetic steel trigger on the rail through interfaces, and the output end Ro, the output end RE and the output end DE of the acquisition chip and the driver input end DI of the acquisition chip are connected with the microcontroller.
4. The automatic identification device of railway wagon number based on RF-ID as claimed in claim 1, wherein: the radio frequency module comprises a radio frequency DAC signal reconstruction filter circuit, a radio frequency DAC biasing circuit and a gain circuit which are sequentially connected in series.
5. The automatic identification device of railway wagon number based on RF-ID as claimed in claim 4, wherein: the radio frequency DAC signal reconstruction filter circuit comprises two filter circuits, each filter circuit comprises an inductor L and a capacitor C which are connected in parallel, the two filter circuits are connected in series, the input end of the filter circuit at the front end is connected with an inductor RT1, the input end of an inductor RT1 is the input end of the radio frequency DAC signal reconstruction filter circuit and is connected with the microcontroller, and the output end of the inductor RT1 is also grounded through a capacitor C3;
the two filter circuits are grounded through a capacitor C4, the output end of the filter circuit at the rear end is connected with the input end of the radio frequency DAC biasing circuit, the output end of the filter circuit at the rear end is grounded through a capacitor C5, and meanwhile, the output end of the filter circuit at the rear end is grounded through a resistor RT 2.
6. The automatic identification device of railway wagon number based on RF-ID as claimed in claim 5, wherein: the radio frequency DAC bias circuit comprises an amplifier U1, the reverse input end of the amplifier U1 is connected with the output end of the radio frequency DAC signal reconstruction filter circuit through a resistor R5, and the non-inverting input end of the amplifier U1 is connected with a reference voltage; meanwhile, the inverting input terminal of the amplifier U1 is connected to the output terminal of the amplifier U1 through the resistor R6, the output terminal of the amplifier U1 is connected to the resistor R7, and the output terminal of the resistor R7 is the output terminal of the rf DAC biasing circuit and is connected to the gain circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921007591.XU CN210234991U (en) | 2019-07-01 | 2019-07-01 | Railway wagon number automatic identification device based on RF-ID |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921007591.XU CN210234991U (en) | 2019-07-01 | 2019-07-01 | Railway wagon number automatic identification device based on RF-ID |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210234991U true CN210234991U (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921007591.XU Expired - Fee Related CN210234991U (en) | 2019-07-01 | 2019-07-01 | Railway wagon number automatic identification device based on RF-ID |
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| CN (1) | CN210234991U (en) |
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- 2019-07-01 CN CN201921007591.XU patent/CN210234991U/en not_active Expired - Fee Related
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