Subway track defect detection system

Abstract

The utility model provides a subway track defect detection system. The subway track defect detection system comprises an ultrasonic flaw detection module configured to detect internal defects of a subway track; a coupling agent storage tank configured to store an ultrasonic coupling agent; the flow pump is configured to convey the coupling agent with set flow in the coupling agent storage box to the probe of the ultrasonic flaw detection module; and the controller is configured to control the starting period of the flow pump. According to the invention, the accuracy of subway track defect detection can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of detection, and in particular to a subway track defect detection system. BACKGROUND

[0002] Subway trains run at a high speed. If there are defects in the track, such as rail fracture, severe wear or tie damage, etc., the train wheels may lose normal support and guidance during operation, resulting in derailment, which not only causes damage to the train itself, but also endangers the safety of passengers. Regular track defect detection can detect potential problems in advance and take timely measures to ensure the safety of subway operation.

[0003] For internal damage of the subway track, an ultrasonic flaw detector can usually be used for detection. The ultrasonic flaw detector emits ultrasonic waves, and detects defects such as cracks and pores in the rail according to the reflection, refraction and scattering of the ultrasonic waves when the ultrasonic waves propagate inside the track. The ultrasonic waves emitted by the ultrasonic flaw detector need to be transmitted into the track through a coupling agent. The subway track environment is complex, and the coupling agent is prone to loss and dryness, which affects the transmission efficiency of the sound waves and causes the signal to be weak, thereby affecting the accuracy of the detection. CONTENT OF THE INVENTION

[0004] Embodiments of the present disclosure provide a subway track defect detection system to improve the accuracy of subway track defect detection.

[0005] Embodiments of the present disclosure provide a subway track defect detection system, comprising:

[0006] An ultrasonic flaw detection module configured to detect internal defects of the subway track;

[0007] A coupling agent storage tank configured to store ultrasonic coupling agent;

[0008] A flow pump configured to deliver a set flow of the coupling agent in the coupling agent storage tank to a probe of the ultrasonic flaw detection module;

[0009] A controller configured to control the opening period of the flow pump.

[0010] In an exemplary embodiment of the present disclosure, the ultrasonic flaw detection module comprises an ultrasonic transmitting circuit and an ultrasonic receiving circuit both connected with an ultrasonic host,

[0011] The ultrasonic transmitting circuit comprises a resistor R2, a switch tube Q1, a capacitor C2, a resistor R5, a diode D1, a resistor R3 and a resistor R4, a first end of the resistor R2 is used to be connected with a high-voltage power supply, a second end of the resistor R2 is connected with a first end of the switch tube Q1, a second end of the switch tube Q1 is grounded, a control end of the switch tube Q1 is connected with a first signal output end of the ultrasonic host,

[0012] The first end of the capacitor C2 is connected with the second end of the resistor R2, the second end of the capacitor C2 is grounded through the resistor R5, the second end of the capacitor C2 is connected with the cathode of the diode D1, the anode of the diode D1 is grounded through the resistor R3, the resistor R4 is connected with the resistor R3 in parallel,

[0013] The anode of the diode D1 is connected with the positive pole of the probe, and the negative pole of the probe is grounded.

[0014] In an exemplary embodiment of the present disclosure, the subway track defect detection system further comprises an optical coupler U1, a switch tube Q2 and a resistor R8,

[0015] The first input end of the optical coupler U1 is connected with a first power supply, the second input end of the optical coupler U1 is connected with the first end of the switch tube Q2, the second end of the switch tube Q2 is grounded, and the control end of the switch tube Q2 is connected with the second signal output end of the ultrasonic host,

[0016] The first output end of the optical coupler U1 is connected with the first end of the resistor R8, the second end of the resistor R8 is connected with the positive pole of the probe, and the second output end of the optical coupler U1 is grounded.

[0017] In an exemplary embodiment of the present disclosure, an adjustable capacitor C3 is arranged between the anode of the diode D1 and the positive pole of the probe.

[0018] In an exemplary embodiment of the present disclosure, a low-pass filter circuit is arranged between the resistor R2 and the high-voltage power supply, the low-pass filter circuit comprising a resistor R1 and a capacitor C1,

[0019] The first end of the resistor R1 is connected with the high-voltage power supply, the second end of the resistor R1 is grounded through the capacitor C1, and the second end of the resistor R1 is the output end of the low-pass filter circuit.

[0020] In an exemplary embodiment of the present disclosure, the subway track defect detection system further comprises:

[0021] An acceleration sensor configured to detect the moving speed of the ultrasonic flaw detection module, the output end of the ultrasonic flaw detection module being connected with the controller,

[0022] The controller is configured to turn off the flow pump when the moving speed of the ultrasonic flaw detection module is less than a set speed.

[0023] In an exemplary embodiment of the present disclosure, the subway track defect detection system further comprises:

[0024] A visual detection module configured to detect the surface defects of the subway track, the output end of the visual detection module being connected with the controller.

[0025] The metro track defect detection system provided by the embodiment of the present disclosure has the following working principle and beneficial effects:

[0026] In the embodiment of the present disclosure, the ultrasonic flaw detection module is used to detect internal defects of the metro track, such as micro fatigue cracks, etc. Considering that the ultrasonic wave attenuates seriously in the air and it is difficult to effectively transmit into the track material, the coupling agent can fill the small air gap between the probe and the track surface, so that the ultrasonic wave can smoothly transmit from the probe to the track, thereby ensuring the accuracy and effectiveness of the flaw detection.

[0027] In order to realize the timing replenishment of the coupling agent, the coupling agent storage tank and the flow pump are arranged in the embodiment of the present disclosure. The flow pump is controlled to periodically deliver the coupling agent in the coupling agent storage tank to the probe of the ultrasonic flaw detection module, so as to ensure the flaw detection effect, thereby improving the accuracy of the metro track defect detection. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is a principle block diagram of a metro track defect detection system provided by the embodiment of the present disclosure;

[0030] Figure 2 is a principle diagram of an ultrasonic emission circuit provided by the embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] In order to make the personnel in the technical field better understand the present scheme, the technical solutions in the embodiments of the present scheme will be clearly described in combination with the drawings in the embodiments of the present scheme. Obviously, the described embodiments are only some of the embodiments of the present scheme, not all. Based on the embodiments in the present scheme, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present scheme.

[0032] The terms "include", and other any variants thereof, in the specification and claims of the present scheme and the above-mentioned drawings, refer to "include but not limited to", and are intended to cover non-exclusive inclusion, and are not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0033] The implementation of the present disclosure will be described in detail in combination with specific drawings:

[0034] Figure 1 This is a schematic block diagram of a subway track defect detection system provided in an embodiment of this disclosure. (Refer to...) Figure 1 The subway track defect detection system includes:

[0035] The ultrasonic flaw detection module 10 is configured to detect internal defects in subway tracks;

[0036] The coupling agent storage tank 11 is configured to store ultrasonic coupling agent;

[0037] The flow pump 12 is configured to deliver a set flow rate of couplant in the couplant storage tank 11 to the probe of the ultrasonic flaw detection module 10;

[0038] The controller 13 is configured to control the on-time of the flow pump 12.

[0039] In this embodiment, the ultrasonic flaw detection module 10 is used to detect internal defects in subway tracks, such as micro fatigue cracks. Considering that ultrasonic waves attenuate significantly in air and are difficult to effectively penetrate into the track material, the coupling agent can fill the tiny air gap between the probe and the track surface, allowing ultrasonic waves to be smoothly transmitted from the probe to the track, thereby ensuring the accuracy and effectiveness of flaw detection.

[0040] In order to achieve timed replenishment of the coupling agent, this embodiment of the present disclosure provides a coupling agent storage tank 11 and a flow pump 12. By controlling the flow pump 12 to periodically deliver the coupling agent in the coupling agent storage tank 11 to the probe of the ultrasonic flaw detection module 10, the flaw detection effect can be guaranteed.

[0041] Reference Figure 2 In one exemplary embodiment of this disclosure, the ultrasonic flaw detection module 10 includes an ultrasonic transmitting circuit and an ultrasonic receiving circuit, both connected to the ultrasonic host.

[0042] The ultrasonic transmitting circuit includes a resistor R2, a switching transistor Q1, a capacitor C2, a resistor R5, a diode D1, a resistor R3, a resistor R4, and a probe. The first terminal of resistor R2 is connected to a high-voltage power supply, and the second terminal of resistor R2 is connected to the first terminal of switching transistor Q1. The second terminal of switching transistor Q1 is grounded, and the control terminal of switching transistor Q1 is connected to the first signal output terminal of the ultrasonic host.

[0043] The first terminal of capacitor C2 is connected to the second terminal of resistor R2. The second terminal of capacitor C2 is grounded through resistor R5. The second terminal of capacitor C2 is connected to the cathode of diode D1. The anode of diode D1 is grounded through resistor R3. Resistor R4 is connected in parallel with resistor R3.

[0044] The anode of the diode D1 is connected to the positive pole of the ultrasonic transducer, and the negative pole of the ultrasonic transducer is grounded.

[0045] In the embodiment, the ultrasonic host is used to send a trigger signal to the ultrasonic transmitting circuit, trigger the ultrasonic transmitting circuit to send an ultrasonic signal, the ultrasonic signal propagates inside the subway track, when the ultrasonic wave propagates inside the subway track encounters a defect (such as a crack, a cavity, etc.), part of the ultrasonic wave will be reflected back, the reflected ultrasonic wave is received by the ultrasonic probe, and after being amplified and filtered by the ultrasonic receiving circuit, it is sent to the ultrasonic host, and the ultrasonic host analyzes the time, amplitude, phase and other characteristics of the signal to determine whether there is a defect inside the subway track. For example, if the received signal has an abnormal amplitude reflection wave at a certain time, and this time corresponds to a certain depth position inside the track, then it can be inferred that there is a defect at this depth position.

[0046] The working principle of the ultrasonic transmitting circuit is as follows: when the ultrasonic host sends a low-level signal to the control end of the switch tube Q1, the switch tube Q1 is cut off, the high-voltage power supply charges the capacitor C2 through the resistor R2 and the resistor R5, and the capacitor C2 stores energy; when the ultrasonic host sends a high-level signal to the control end of the switch tube Q1, the switch tube Q1 is turned on, the capacitor C2 is discharged through the switch tube Q1, the resistor R5, the resistor R3 and the resistor R4, and a negative voltage is applied to the ultrasonic probe at the same time. The negative voltage can adjust the equivalent capacitance and inductance and other electrical parameters inside the probe, so that the probe and the subsequent receiving circuit are better matched, thereby improving the reception efficiency of the probe to the weak echo signal and reducing signal loss.

[0047] From the above, it can be seen that the charging and discharging of the capacitor C2 in the embodiment provides a negative high-voltage pulse for the probe of the ultrasonic flaw detection module 10, which can improve the reception efficiency of the probe to the weak echo signal and reduce signal loss.

[0048] Reference Figure 2 In an exemplary embodiment of the present disclosure, the subway track defect detection system further comprises an optical coupler U1, a switch tube Q2 and a resistor R8,

[0049] The first input end of the optical coupler U1 is connected to the first power supply, the second input end of the optical coupler U1 is connected to the first end of the switch tube Q2, the second end of the switch tube Q2 is grounded, and the control end of the switch tube Q2 is connected to the second signal output end of the ultrasonic host,

[0050] The first output end of the optical coupler U1 is connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the positive pole of the probe, and the second output end of the optical coupler U1 is grounded.

[0051] In the embodiment, considering that when the excitation voltage at both ends of the probe (i.e. the ultrasonic transducer) is removed, the mechanical vibration of the probe will not disappear immediately but will gradually attenuate due to the inertia of the mechanical vibration, and an acoustic wave signal will be generated during the attenuation period, which brings tail vibration to the transmitting circuit. If the tail vibration of the probe is not eliminated or reduced in time, the echo of the ultrasonic wave and the tail vibration will overlap, the waveform of the tail vibration and the echo superimposed together is invalid, which causes a measurement blind area of the echo and may cause a missed detection of defects.

[0052] To solve the above problems, in the embodiment, an energy absorption resistor R8 is connected in parallel at both ends of the probe, and the working state of the energy absorption resistor R8 is controlled by an optical coupler U1. Specifically, when the probe finishes a transmission, the ultrasonic host sends a high-level signal to the control end of a switch tube Q2, the switch tube Q2 drives the optical coupler U1 to be turned on, the first output end and the second output end of the optical coupler U1 are communicated, the first end of the energy absorption resistor R8 is grounded, the energy absorption resistor R8 is connected in parallel with the probe, and the excess tail vibration signal is consumed through a loop between the energy absorption resistor R8 and the ground, so as to achieve the purpose of suppressing the tail vibration.

[0053] From the above, it can be concluded that in the embodiment, the setting of the optical coupler U1 and the energy absorption resistor R8 can provide a discharge path for the residual energy after the probe finishes transmission, and reduce the tail vibration after transmission.

[0054] With reference to Figure 2 In an exemplary embodiment of the present disclosure, an adjustable capacitor C3 is arranged between the anode of the diode D1 and the positive electrode of the probe.

[0055] In the embodiment, when the frequency of the negative pulse voltage applied to the probe is equal to or close to the resonance frequency of the probe, the ultrasonic transmission efficiency is the highest. By arranging the adjustable capacitor C3 between the anode of the diode D1 and the positive electrode of the probe, the resonance frequency of the probe can be adjusted to be equal to the frequency of the negative pulse voltage, so as to achieve the highest transmission efficiency.

[0056] With reference to Figure 2 In an exemplary embodiment of the present disclosure, a low-pass filter circuit is arranged between the resistor R2 and the high-voltage power supply, the low-pass filter circuit comprising a resistor R1 and a capacitor C1,

[0057] The first end of the resistor R1 is connected with the high-voltage power supply, the second end of the resistor R1 is grounded through the capacitor C1, and the second end of the resistor R1 is the output end of the low-pass filter circuit.

[0058] In the embodiment, the resistor R1 and the capacitor C1 constitute a low-pass filter circuit, which can filter out high-frequency interference signals in the input high-voltage power supply, so as to avoid the influence of the high-frequency interference signals on the frequency of the negative pulse voltage.

[0059] In one exemplary embodiment of this disclosure, the subway track defect detection system further includes:

[0060] An accelerometer is configured to detect the moving speed of the ultrasonic flaw detection module 10, the output of which is connected to the controller 13.

[0061] The controller 13 is configured to shut off the flow pump 12 when the moving speed of the ultrasonic flaw detection module 10 is less than a set speed.

[0062] In this embodiment, considering that in actual operation, when the ultrasonic flaw detection module 10 moves slowly or even stops, it indicates that it may be in a stage of detection pause, equipment debugging or fault diagnosis, and continuing to deliver the coupling agent would result in a waste of the coupling agent.

[0063] Therefore, in this embodiment, an accelerometer is set to detect the moving speed of the ultrasonic flaw detection module 10 and send it to the controller 13. When the moving speed of the ultrasonic flaw detection module 10 is less than the set speed, the controller 13 controls the flow pump 12 to stop working in time to avoid wasting the coupling agent.

[0064] As can be seen from the above, this embodiment, through the coordinated work of the accelerometer and the controller 13, can control the replenishment of the coupling agent according to the motion state of the ultrasonic flaw detection module 10, thus avoiding the waste of coupling agent during unnecessary periods.

[0065] In one exemplary embodiment of this disclosure, the subway track defect detection system further includes:

[0066] A visual inspection module is configured to detect surface defects in subway tracks, and the output of the visual inspection module is connected to the controller 13.

[0067] In this embodiment, considering the emission and reception characteristics of ultrasonic waves, there is a flaw detection blind zone near the track surface, and some shallow surface defects are easily missed. Therefore, the subway track defect detection system in this embodiment is also equipped with a visual inspection module. The visual inspection module acquires image information of the subway track surface through high-precision cameras and other equipment, and then uses image processing algorithms to analyze and process these images, thereby identifying various defects on the track surface, such as cracks, wear, deformation, and foreign object intrusion.

[0068] The visual inspection module transmits the detected track surface defect information to the controller 13. The controller 13 combines the output data of the visual inspection module and the ultrasonic flaw detection module 10 to achieve comprehensive detection of subway track defects.

[0069] From the above, the embodiment combines the visual detection module and the ultrasonic flaw detection module 10, realizes the all-around detection of the subway track from the surface to the inside, greatly improves the comprehensiveness and accuracy of the detection, and can more comprehensively evaluate the health condition of the subway track and timely find potential safety hazards.

[0070] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A metro track defect detection system, characterized in that, The application relates to an ultrasonic flaw detection device for subway tracks. The ultrasonic flaw detection device comprises an ultrasonic flaw detection module configured to detect internal defects of a subway track, a coupling agent storage tank configured to store ultrasonic coupling agent, a flow pump configured to deliver coupling agent of a set flow from the coupling agent storage tank to a probe of the ultrasonic flaw detection module, and a controller configured to control an opening period of the flow pump. The ultrasonic flaw detection module comprises an ultrasonic transmitting circuit and an ultrasonic receiving circuit, both of which are connected to an ultrasonic host. The ultrasonic transmitting circuit comprises a resistor R2, a switch tube Q1, a capacitor C2, a resistor R5, a diode D1, a resistor R3 and a resistor R4. The first end of the resistor R2 is used to be connected to a high-voltage power supply. The second end of the resistor R2 is connected to the first end of the switch tube Q1. The second end of the switch tube Q1 is grounded. The control end of the switch tube Q1 is connected to the first signal output end of the ultrasonic host. The first end of the capacitor C2 is connected to the second end of the resistor R2. The second end of the capacitor C2 is grounded through the resistor R5. The second end of the capacitor C2 is connected to the cathode of the diode D1. The anode of the diode D1 is grounded through the resistor R3. The resistor R4 is connected in parallel with the resistor R3. The anode of the diode D1 is connected to the positive pole of the probe. The negative pole of the probe is grounded.

2. The subway track defect detection system of claim 1, wherein, The ultrasonic flaw detection device further comprises an optical coupler U1, a switch tube Q2 and a resistor R8.

3. The subway track defect detection system of claim 1, wherein The first input end of the optical coupler U1 is connected to a first power supply. The second input end of the optical coupler U1 is connected to the first end of the switch tube Q2.

4. The subway track defect detection system of claim 1, wherein The second end of the switch tube Q2 is grounded. The control end of the switch tube Q2 is connected to the second signal output end of the ultrasonic host. The first output end of the optical coupler U1 is connected to the first end of the resistor R8. The second end of the resistor R8 is connected to the positive pole of the probe. The second output end of the optical coupler U1 is grounded. The ultrasonic flaw detection device further comprises an acceleration sensor configured to detect the moving speed of the ultrasonic flaw detection module. The output end of the ultrasonic flaw detection module is connected to the controller. The controller is configured to turn off the flow pump when the moving speed of the ultrasonic flaw detection module is less than a set speed. An adjustable capacitor C3 is arranged between the anode of the diode D1 and the positive pole of the probe. A low-pass filter circuit is arranged between the resistor R2 and the high-voltage power supply. The low-pass filter circuit comprises a resistor R1 and a capacitor C1. The first end of the resistor R1 is connected to the high-voltage power supply. The second end of the resistor R1 is grounded through the capacitor C1. The second end of the resistor R1 is the output end of the low-pass filter circuit. The ultrasonic flaw detection device further comprises a visual detection module configured to detect surface defects of a subway track. The output end of the visual detection module is connected to the controller.

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