Railway wireless wheel sensor

Abstract

The invention relates to the technical field of sensors, and particularly discloses a railway wireless wheel sensor which is characterized in that a wireless transmission transmitting end is arranged in an aluminum casting shell, and a receiving end is in wireless communication with the wireless transmission transmitting end; the wireless transmission transmitting end comprises a magnetoelectric induction circuit, a magnetic induction resonance circuit and a control circuit board, the wireless transmission transmitting circuit, the signal output end of the magnetic induction resonance circuit and the signal input end of the wireless transmission transmitting circuit are all connected with the control circuit board, and the magnetoelectric induction circuit is connected with the magnetic induction resonance circuit. According to the invention, the housing adopts the aluminum casting design, is firm and durable, has good sealing performance, can effectively shield the radiation of electromagnetic waves, has strong anti-interference capability, is not provided with an external cable, is not interfered by track current, harmonic waves and the like, and outputs stable and reliable sine wave signals. Wheel signals are collected and directly connected to the control circuit board, and triggering can be recognized as long as a train arrives at the position of the wireless wheel sensor.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, and in particular to a railway wireless wheel sensor. Background Art

[0002] Railway wheel sensors are an indispensable part of railway line detection equipment and are widely used in automated systems for detecting vehicles on various lines in railways, steel, and mines. Vehicle 5T equipment, level crossing warning equipment, track scale equipment, vehicle number recognition systems, etc. all require wheel sensors to identify and locate vehicles.

[0003] The wheel sensors currently in use all need to be connected to the signal processing unit through connecting cables, laying cable trenches, and determining the train position. Due to the long connection lines, the wheel sensors are easily interfered by track circuits, moisture, etc., and may misjudge the approach of trains, thus interfering with the operation of the equipment.

[0004] The connection line of the wheel sensor of the 5T equipment of railway vehicles needs to be laid in an 80-meter cable trench with a depth of 800mm beside the track. When crossing the track, galvanized steel pipes must be buried at a depth of 800mm under the track for protection, which is very difficult to construct. There are cables for communication, signal, power, etc. buried underground beside the track. Once they are dug up, the consequences are serious and affect the safety of railway driving.

[0005] Therefore, a railway wireless wheel sensor has become an urgent problem to be solved. Summary of the invention

[0006] The technical problem to be solved by the present invention is a railway wireless wheel sensor with stable energy supply and reliable data transmission.

[0007] In order to solve the above technical problems, the present invention provides a technical solution: a railway wireless wheel sensor, comprising an aluminum casting shell, a wireless transmission transmitting end and a receiving end; the wireless transmission transmitting end is arranged inside the aluminum casting shell, and the receiving end communicates wirelessly with the wireless transmission transmitting end;

[0008] The wireless transmission transmitting end includes a magnetoelectric induction circuit, a magnetic induction resonant circuit, a control circuit board, and a wireless transmission transmitting circuit. The signal output end of the magnetic induction resonant circuit and the signal input end of the wireless transmission transmitting circuit are both connected to the control circuit board, and the magnetoelectric induction circuit is connected to the magnetic induction resonant circuit.

[0009] Furthermore, the control circuit board integrates a single-chip microcomputer, a power supply circuit and a power supply module, the input end of the power supply circuit is connected to the power supply module, the magnetic induction resonance circuit, the transmitting circuit and the single-chip microcomputer are all connected to the power output end of the power supply circuit, and the signal output end of the magnetic induction resonance circuit and the signal input end of the wireless transmission transmitting circuit are both connected to the single-chip microcomputer.

[0010] Furthermore, the power supply module adopts dual power supply, including lithium-polymer battery and lithium-ion battery. The lithium-polymer battery is connected to the signal output end of the magnetic induction resonance circuit to power the control circuit, and the lithium-ion battery is connected to the wireless transmission transmission circuit to power it.

[0011] Furthermore, the aluminum casting shell is provided with an opening, and the wireless transmission transmission circuit includes a wireless transmission antenna, and the wireless transmission antenna is fixed in the opening of the aluminum casting shell.

[0012] Furthermore, the magnetoelectric induction circuit includes a U-shaped NdFeB permanent magnet and a coil, and the coil is arranged inside the U-shaped NdFeB permanent magnet.

[0013] Furthermore, the receiving end is provided with an LED light and an output interface.

[0014] Compared with the prior art, the advantages of the present invention are: the present invention will reduce the difficulty of on-site construction, is easy to install, save a lot of social resources, and improve transportation efficiency. Due to the convenient disassembly and assembly, it can also be used for safety warning and protection at the construction site. It adopts an aluminum casting design, which is strong and durable with good sealing. Aluminum casting materials have high electrical conductivity and good sealing performance, can effectively shield the radiation of electromagnetic waves, have good shielding effect, strong anti-interference ability, no external cables, and are not affected by external factors such as track current and harmonic interference. The output sinusoidal wave signal is stable and reliable. The wheel signal collected by the present invention is directly connected to the control circuit board, and there is no cable loss. As long as the train reaches the position of the wireless wheel sensor, it can identify the trigger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the aluminum die-cast housing.

[0016] Figure 2 is a side view of the aluminum die-cast housing.

[0017] Figure 3 It is a cross-sectional view of the aluminum die-cast housing and the wireless transmission transmitter.

[0018] Figure 4 It is the circuit schematic diagram of the wireless transmission transmitter.

[0019] Figure 5 It is a structural diagram of the receiving end.

[0020] As shown in the figure: 1. Aluminum die-cast shell, 2. Wireless transmission transmitter, 3. Receiving end, 4. Magnetoelectric induction circuit, 5. Magnetic induction resonance circuit, 6. Control circuit board, 7. Wireless transmission transmitter circuit, 8. Single chip microcomputer, 9. Power supply circuit, 10. Power supply module, 11. Wireless transmitting antenna, 12. U-shaped NdFeB permanent magnet, 13. Coil, 14. LED light, 15. Output interface. DETAILED DESCRIPTION

[0021] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inside”, “outside”, “vertical” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The following is a further detailed description of a railway wireless wheel sensor of the present invention in conjunction with the accompanying drawings.

[0024] Working principle of the present invention:

[0025] The circuit part includes a magnetoelectric induction coil 13, a magnetic induction resonance circuit 5, a control circuit board 6, and a wireless transmission transmitting circuit 7. A single-chip microcomputer 8 and a power supply circuit 9 are integrated on the control circuit board 6. The input end of the power supply circuit 9 is connected to a power supply module 10. The magnetic induction resonance circuit 5, the wireless transmission transmitting circuit 7, and the single-chip microcomputer 8 are all connected to the power output end corresponding to the power supply circuit 9 to realize power supply. The signal output end of the magnetic induction resonance circuit 5 and the signal input end of the transmitting circuit are both connected to the control circuit single-chip microcomputer 8. The power supply part adopts a dual power supply mode, a lithium-polymer battery and a lithium-ion battery. The rechargeable lithium-polymer battery is connected to the signal output end of the magnetic induction resonance circuit 5. The induced electromotive force generated by the vehicle wheelset is charged through an intelligent wide-band charging circuit to supply power to the control circuit. The lithium-ion battery is responsible for supplying power to the wireless module.

[0026] 1. Wireless transmission:

[0027] 1. The wireless transmission transmitting end 2 is installed in the aluminum casting, and the aluminum casting has an opening for installing the wireless transmitting antenna 11;

[0028] 2. The transmitting end is equipped with a U-shaped NdFeB permanent magnet 12 and a coil 13. It receives the electrical signal generated when a train passes through the coil 13, determines that a train has passed, triggers the wireless module, and sends the incoming train signal to the wireless receiving end 3;

[0029] 3. The transmitter detects the battery power once every 24 hours. When the battery power is less than 10%, it sends a low-battery signal to the receiver 3 to prompt the receiver to replace the battery.

[0030] 4. To save battery power, after judging that a vehicle is approaching, if the wheel sensor is triggered more than 3 times, no vehicle approaching signal will be sent to the receiving end 3 within 300 seconds;

[0031] 5. Adopt LoRa wireless module, which has long distance, low power consumption and strong anti-interference ability. Supports sleep and wake-up dual modes. It is in sleep mode when there is no car and wakes up when a car comes.

[0032] 6. Use dual battery pack power supply mode, large-capacity lithium-ion battery, temperature range -40℃~+85℃, adapt to bad weather outside; use intelligent charging technology, the wheels generate induction electric force, trigger the control board to work, and charge the lithium polymer battery pack at the same time. Use independent circuit design to ensure that the two batteries operate under their respective best working conditions, and prevent current backflow and voltage mismatch problems through appropriate circuit protection measures (such as diode isolation).

[0033] 2. Receiver 3:

[0034] 1. One receiving end 3 only receives the signal from one transmitting end and makes pairing memory; multiple wireless vehicle sensors can be installed at one station at the same time without interfering with each other.

[0035] 2. The receiving end 3 is equipped with an LED light 14 for: prompting the transmitting end that the battery is low;

[0036] 3. The receiving end 3 has an output interface 15, which sends a sine wave signal or a pulse signal to the detection device. After the detection device processes and judges, it starts up and enters the vehicle receiving state;

[0037] 3. Technical indicators:

[0038] Working principle: Magnetic cutting wire generates induced current;

[0039] Working mode: non-contact induction. During installation, make sure that the railway wheels cannot touch the top of the sensor.

[0040] Applicable rail types: 43kg, 50kg, 60kg, 75kg

[0041] Working voltage: passive;

[0042] Output amplitude (Vp-p): 1V±2.5V;

[0043] Adaptable speed: 0-360KM / H;

[0044] Working temperature: -45℃-+85℃;

[0045] Storage temperature: -60℃--+120℃;

[0046] Relative humidity: less than 95%;

[0047] Vibration noise: ≤50mV;

[0048] Quiet noise: ≤20mV;

[0049] Insulation resistance:>200MΩ;

[0050] Surface multiplied magnetic field strength:>3300GS;

[0051] Magnetic polarity of the top of the magnet: N pole; can be adjusted to S pole as needed.

[0052] Demagnetization characteristics: >2 years.

[0053] Combined with Figure 1-5 The specific implementation process of a railway wireless wheel sensor of the present invention is as follows:

[0054] A railway wireless wheel sensor comprises an aluminum casting housing 1, a wireless transmission transmitting end 2 and a receiving end 3. The wireless transmission transmitting end 2 is arranged inside the aluminum casting housing 1, and the receiving end 3 performs wireless communication with the wireless transmission transmitting end 2. The aluminum casting housing 1 has good protection performance and can protect the internal circuit from interference and damage from the external environment.

[0055] The wireless transmission transmitting end 2 includes a magnetoelectric induction circuit 4, a magnetic induction resonant circuit 5, a control circuit board 6, and a wireless transmission transmitting circuit 7. The signal output end of the magnetic induction resonant circuit 5 and the signal input end of the wireless transmission transmitting circuit 7 are both connected to the control circuit board 6, and the magnetoelectric induction circuit 4 is connected to the magnetic induction resonant circuit 5. When the wheel passes through the sensor, the magnetoelectric induction circuit 4 generates an induction signal, which is amplified by the magnetic induction resonant circuit 5 and transmitted to the control circuit board 6 for processing. The processed data is sent to the receiving end 3 through the wireless transmission transmitting circuit 7.

[0056] The control circuit board 6 is integrated with a single-chip microcomputer 8, a power circuit 9 and a power supply module 10. The input end of the power circuit 9 is connected to the power supply module 10, and the magnetic induction resonance circuit 5, the transmitting circuit, and the single-chip microcomputer 8 are all connected to the power output end of the power circuit 9. The single-chip microcomputer 8 is responsible for controlling the operation of the entire system, including data collection, processing and transmission. The power circuit 9 provides a stable power supply for the system to ensure the normal operation of each component. The power supply module 10 adopts a dual power supply, including a lithium-polymer battery and a lithium-ion battery. The lithium-polymer battery is connected to the signal output end of the magnetic induction resonance circuit 5 to power the control circuit, and the lithium-ion battery is connected to the wireless transmission transmitting circuit 7 to power it. The dual power supply design improves the stability of the energy supply of the system. Even if one power supply is exhausted, the other power supply can continue to supply power to ensure the continuous operation of the system.

[0057] The aluminum casting housing 1 is provided with an opening, and the wireless transmission transmission circuit 7 includes a wireless transmission antenna 11, which is fixed in the opening of the aluminum casting housing 1. The wireless transmission antenna 11 is responsible for sending the processed data to the receiving end 3 in a wireless manner to realize remote transmission of data.

[0058] The magnetoelectric induction circuit 4 includes a U-shaped NdFeB permanent magnet 12 and a coil 13, wherein the coil 13 is disposed inside the U-shaped NdFeB permanent magnet 12. When the wheel passes through the sensor, the U-shaped NdFeB permanent magnet 12 generates a changing magnetic field, thereby generating an induced current in the coil 13, which is a magnetoelectric induction signal. The design of the magnetoelectric induction circuit 4 improves the sensitivity and response speed of the sensor.

[0059] The receiving end 3 is provided with an LED light 14 and an output interface 15. The LED light 14 is used to indicate whether the receiving end 3 has received data, so that the user can intuitively understand the working status of the sensor. The output interface 15 is used to output the received data to other devices or systems for further analysis and processing.

[0060] The railway wireless wheel sensor of the present invention will reduce the difficulty of on-site construction, is easy to install, saves a lot of social resources, and improves transportation efficiency. Due to the convenient disassembly and assembly, it can also be used for safety warning and protection at the construction site. The overall aluminum casting design is adopted, which is strong and durable with good sealing. The aluminum casting material has high conductivity and good sealing performance, can effectively shield the radiation of electromagnetic waves, has good shielding effect, strong anti-interference ability, has no external cables, is not affected by external interference such as track current and harmonics, and outputs a stable and reliable sinusoidal wave signal.

[0061] The railway wireless wheel sensor of the present invention is adapted to a vehicle speed of 5km-360km per hour, and the output amplitude is about 2V. The higher the vehicle speed, the greater the output amplitude, and the maximum is 2.5V. The wheel signal collected by the present invention is directly connected to the control circuit board 6, and there is no cable loss. When the train speed is increased to more than 1KM per hour, as long as the train reaches the position of the wireless wheel sensor, it can be identified and triggered.

[0062] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A railway wireless wheel sensor, characterized in that: It comprises an aluminum casting housing (1), a wireless transmission transmitting end (2) and a receiving end (3); the wireless transmission transmitting end (2) is arranged inside the aluminum casting housing (1), and the receiving end (3) is in wireless communication with the wireless transmission transmitting end (2); The wireless transmission transmitting end (2) comprises a magnetoelectric induction circuit (4), a magnetic induction resonant circuit (5), a control circuit board (6), and a wireless transmission transmitting circuit (7); a signal output end of the magnetic induction resonant circuit (5) and a signal input end of the wireless transmission transmitting circuit (7) are both connected to the control circuit board (6); and the magnetoelectric induction circuit (4) is connected to the magnetic induction resonant circuit (5).

2. A railway wireless wheel sensor according to claim 1, characterized in that: The control circuit board (6) is integrated with a single-chip microcomputer (8), a power supply circuit (9) and a power supply module (10); the input end of the power supply circuit (9) is connected to the power supply module (10); the magnetic induction resonance circuit (5), the transmitting circuit and the single-chip microcomputer (8) are all connected to the power output end of the power supply circuit (9); and the signal output end of the magnetic induction resonance circuit (5) and the signal input end of the wireless transmission transmitting circuit (7) are all connected to the single-chip microcomputer (8).

3. A railway wireless wheel sensor according to claim 2, characterized in that: The power supply module (10) is powered by dual power sources, including a lithium-polymer battery and a lithium-ion battery. The lithium-polymer battery is connected to the signal output end of the magnetic induction resonance circuit (5) to supply power to the control circuit, and the lithium-ion battery is connected to the wireless transmission transmission circuit (7) to supply power to the wireless transmission transmission circuit.

4. A railway wireless wheel sensor according to claim 3, characterized in that: The aluminum casting housing (1) is provided with an opening, and the wireless transmission transmission circuit (7) comprises a wireless transmission antenna (11), and the wireless transmission antenna (11) is fixed in the opening of the aluminum casting housing (1).

5. A railway wireless wheel sensor according to claim 4, characterized in that: The magnetoelectric induction circuit (4) comprises a U-shaped NdFeB permanent magnet (12) and a coil (13), wherein the coil (13) is arranged inside the U-shaped NdFeB permanent magnet (12).

6. The railway wireless wheel sensor according to claim 1, characterized in that: The receiving end (3) is provided with an LED lamp (14) and an output interface (15).

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