A method for rail wheel probe echo frequency detection

Abstract

The application discloses a rail wheel type probe echo frequency detection method, which comprises the following steps: 1, constructing a detection system; 2, detection preparation; 3, 0° probe detection; 4, front +37° probe and front +70° probe detection; 5, rear-37° probe and rear-70° probe detection; 6, front right oblique +70° probe and rear left oblique-70° probe detection; 7, front left oblique +70° probe and rear right oblique-70° probe detection; 8, calculating the time of three cycles of each probe; 9, calculating the echo frequency of each probe. The rail wheel type probe echo frequency detection system is constructed, the center of the 0° probe is detected, the front +37° probe and the front +70° probe are detected, the rear-37° probe and the rear-70° probe can be further detected, the rail probe wheel is rotated left and right, the detection of the remaining four probes is completed, the detection of nine probes can be completed by using one test block, and the detection is convenient and efficient.

Description

Technical Field

[0001] The invention belongs to the technical field of probe echo frequency detection, and in particular relates to a rail wheel probe echo frequency detection method. Background Art

[0002] my country's high-speed rail network is expanding in scale and operating at ever-increasing speeds. As rail transportation intensity and line utilization increase, safety risks are also increasing. Currently, my country is using dual-track ultrasonic testing equipment to simultaneously inspect both tracks. This equipment utilizes a lightweight, modular design and features multiple channels for simultaneous inspection of the rail head, rail waist, and rail foot. The double-track ultrasonic testing equipment consists of an ultrasonic detector, a wheel probe, a cable, a rail car, a coupling agent box, an alignment system, an electromechanical system, system software, and devices connected to the detector during testing. The wheel probes of the two wheels each contain 9 probes, which are fixedly installed in a flexible tire filled with liquid. The ultrasonic wave is coupled with the testing surface through the rolling contact surface of the tire. The 9 probes in the wheel probe are: 1 0° probe; one each of the front 37° (+37°) and rear 37° (-37°), one each of the front 70° (+70°), the front left oblique 70° (left +70°), and the front right oblique 70° (right +70°), one each of the rear 70° (-70°), the rear left oblique 70° (left -70°), and the rear right oblique 70° (right -70°). The inclination angle a of the 70° oblique angle is generally 20°. The 9 probes are arranged according to Figure 1 Arranged in a fixed curved surface on a flexible tire filled with coupling fluid, see Figure 2 When the double-track flaw detection vehicle performs ultrasonic testing on the rails, the wheel probe flexible tire rolls on the rail head, and the nine probes move horizontally with the double-track flaw detection vehicle, but do not rotate with the tires. The nine probes transmit ultrasonic waves and receive defect reflection waves passing through the rail head, rail waist and rail bottom. Figure 3 .

[0003] Currently, the technical requirements for wheel-mounted ultrasonic flaw detectors for rails only specify static and dynamic calibration methods and requirements for the inspection vehicle. There are no specific test parameter requirements or specific testing methods for the performance testing of the ultrasonic detection system. In wheel-mounted ultrasonic flaw detectors for rails, the echo frequency of the wheel is a key parameter that directly affects the ability to detect the smallest defects in the rail. Summary of the Invention

[0004] The technical problems to be solved by the present application are to provide a rail wheel type probe echo frequency detection method and a rail wheel type probe echo frequency detection system to solve the problems in the prior art.

[0005] To solve the above technical problems, the present application adopts the technical scheme of a rail wheel type probe echo frequency detection method, characterized in that the method comprises the following steps:

[0006] Step one, constructing a rail wheel type probe echo frequency detection system: the rail wheel type probe echo frequency detection system comprises a test block for assisting in detecting the echo frequency of the probe in the rail wheel of a double-track flaw detection vehicle, an ultrasonic detector and an oscilloscope, wherein the signal output ends of the probes are connected to the ultrasonic detector, and the probes have nine probes, and the order of the nine probes is 0° probe, front +37° probe, rear -37° probe, front +70° probe, rear -70° probe, front left oblique +70° probe, front right oblique +70° probe, rear left oblique -70° probe and rear right oblique -70° probe;

[0007] The test block comprises a column of rectangular prism structure and a semi-cylindrical column arranged on the upper part of the column, the semi-cylindrical column is arranged in a symmetrical structure on the upper part of the column, the rectangular outer surface of the semi-cylindrical column faces upward and is coplanar with the upper surface of the column, the two semi-circular outer surfaces of the semi-cylindrical column are arranged in parallel with a group of vertical outer surfaces opposite to the column, the length of the column is equal to the width, and the length of the column is less than the height of the column, the height of the column is greater than the diameter of the semi-circular cross section of the semi-cylindrical column, the thickness of the semi-cylindrical column is less than the length of the column, and the bottom center of the column is provided with a flat bottom hole, and the diameter of the semi-circular cross section of the semi-cylindrical column is greater than the diameter of the rail wheel;

[0008] Step two, detection preparation: press the rail wheel on the test block, add appropriate coupling agent in the middle, and keep stable acoustic coupling;

[0009] Step three, detection of the 0° probe: move the 0° probe in the rail wheel to align with the flat bottom hole on the bottom surface of the test block, adjust the position of the rail wheel to make the bottom wave amplitude of the flat bottom hole highest, and then observe the spread waveform of the bottom wave at this time by using the oscilloscope;

[0010] Step 4: Detection of the front +37° probe and the front +70° probe: Move the rail probe wheel in sequence so that the front +37° probe and the front +70° probe in the wheel are aligned with the cylindrical surface on the left side of the test block. Properly adjust the position of the rail probe wheel so that the amplitude of the first bottom wave on the cylindrical surface is the highest. Use an oscilloscope to observe the expanded waveform of the bottom wave at this time.

[0011] Step 5: Detection of the rear -37° probe and the rear -70° probe: Move the rail probe wheel in sequence so that the rear -37° probe and the rear -70° probe in the wheel are aligned with the cylindrical surface on the right side of the test block. Properly adjust the position of the rail probe wheel so that the amplitude of the first bottom wave on the cylindrical surface is the highest. Use an oscilloscope to observe the expanded waveform of the bottom wave at this time.

[0012] Step 6. Detection of the front right oblique +70° probe and the rear left oblique -70° probe: The inclination angle of the rail probe wheel is 70° front and rear, and the rail probe wheel is rotated counterclockwise by an angle a. The rail probe wheels are moved in sequence so that the front right oblique +70° probe and the rear left oblique -70° probe are aligned with the cylindrical surfaces on the left and right sides of the test block. The position of the rail probe wheel is properly adjusted so that the amplitude of the first bottom wave of the cylindrical surface is the highest. The expanded waveform of the bottom wave at this time is observed with an oscilloscope.

[0013] Step 7. Detection of the front left oblique +70° probe and the rear right oblique -70° probe: Rotate the rail probe wheel clockwise by 2a, and move the rail probe wheel in sequence so that the front left oblique +70° probe and the rear right oblique -70° probe are aligned with the cylindrical surfaces on the right and left sides of the test block. Properly adjust the position of the rail probe wheel so that the amplitude of the first bottom wave of the cylindrical surface is the highest. Use an oscilloscope to observe the expanded waveform of the bottom wave at this time.

[0014] Step 8: According to formula T 3i =t 2i -t 1i , calculate the time T of the three cycles of the i-th probe 3i , where i = 1, 2, 3, 4, 5, 6, 7, 8, 9, t 1i is the previous peak time of the highest peak in the echo waveform of the i-th probe, t 2i The second peak time after the peak point of the highest peak in the echo waveform of the i-th probe;

[0015] Step 9: According to the formula Calculate the echo frequency f of the i-th probe i .

[0016] The above-mentioned rail wheel probe echo frequency detection method is characterized in that: the height of the column is 225 mm, the length and width of the column are both 80 mm, the diameter of the flat bottom hole is 2 mm, and the height of the flat bottom hole is 25 mm.

[0017] The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0018] The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0019] The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0020] The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0021] The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0023] Figure 2 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0024] Figure 3 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0025] Figure 4 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0026] Figure 5 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0027] Figure 6 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm. Figure 5 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0028] Figure 7 The rail wheel type probe echo frequency detection method has the features that the diameter of the semi-cylindrical semi-circular section is 200 mm, and the thickness of the semi-cylinder is 40 mm.

[0029] Figure 8 This is a schematic diagram of the arrangement of 9 probes after the rail detection wheel of the present invention rotates counterclockwise by an angle a.

[0030] Figure 9 for Figure 8 Schematic diagram of the arrangement of 9 probes after rotating right by an angle of 2a.

[0031] Figure 10 It is a flowchart of the method of the present invention.

[0032] Description of the accompanying drawings:

[0033] 1—column; 2—semi-cylinder; 3—flat bottom hole;

[0034] 4—Rail detection wheel; 5—Probe. DETAILED DESCRIPTION

[0035] like Figures 1 to 10 As shown, a rail wheel probe echo frequency detection method of the present invention includes the following steps:

[0036] Step 1, construct a rail wheel probe echo frequency detection system: the rail wheel probe echo frequency detection system includes a test block, an ultrasonic detector and an oscilloscope for assisting in detecting the echo frequency of the probe 5 in the rail probe wheel 4 of the double-track flaw detection vehicle, wherein the signal output ends of the probe 5 are all connected to the ultrasonic detector, there are 9 probes 5, and the order of the 9 probes 5 is 0° probe, front +37° probe, rear -37° probe, front +70° probe, rear -70° probe, front left oblique +70° probe, front right oblique +70° probe, rear left oblique -70° probe, and rear right oblique -70° probe;

[0037] The test block includes a column 1 with a rectangular structure and a semi-cylinder 2 arranged on the upper part of the column 1. The semi-cylinder 2 is symmetrically arranged on the upper part of the column 1. The rectangular outer surface of the semi-cylinder 2 faces upward and is coplanar with the upper surface of the column 1. The two semi-circular outer surfaces of the semi-cylinder 2 are parallel to a group of vertical outer surfaces opposite to the column 1. The length and width of the column 1 are equal, and the length of the column 1 is smaller than the height of the column 1. The height of the column 1 is larger than the diameter of the semi-circular cross-section of the semi-cylinder 2. The thickness of the semi-cylinder 2 is smaller than the length of the column 1. A flat-bottom hole 3 is provided at the bottom center of the column 1. The diameter of the semi-circular cross-section of the semi-cylinder 2 is larger than the diameter of the rail detection wheel 4.

[0038] Step 2: Test preparation: Press the rail probe wheel 4 onto the test block, add appropriate coupling agent in the middle to maintain stable acoustic coupling;

[0039] Step three, detection of 0° probe: move the 0° probe of the rail wheel 4 to align with the flat-bottom hole 3 on the bottom surface of the test block, adjust the position of the rail wheel 4 to make the amplitude of the first bottom wave of the flat-bottom hole 3 highest, and then observe the spread waveform of the bottom wave at this time with an oscilloscope;

[0040] Step four, detection of front +37° probe and front +70° probe: move the rail wheel 4 to align the front +37° probe and the front +70° probe of the wheel with the cylindrical surface on the left side of the test block in turn, adjust the position of the rail wheel 4 to make the amplitude of the first bottom wave of the cylindrical surface highest, and then observe the spread waveform of the bottom wave at this time with an oscilloscope;

[0041] Step five, detection of rear -37° probe and rear -70° probe: move the rail wheel 4 to align the rear -37° probe and the rear -70° probe of the wheel with the cylindrical surface on the right side of the test block in turn, adjust the position of the rail wheel 4 to make the amplitude of the first bottom wave of the cylindrical surface highest, and then observe the spread waveform of the bottom wave at this time with an oscilloscope;

[0042] Step six, detection of front right oblique +70° probe and rear left oblique -70° probe: the oblique angle of the front and rear oblique 70° probes of the rail wheel 4 is a, rotate the rail wheel 4 to the left by an angle a, move the rail wheel 4 to align the front right oblique +70° probe and the rear left oblique -70° probe with the cylindrical surfaces on the left and right sides of the test block in turn, adjust the position of the rail wheel 4 to make the amplitude of the first bottom wave of the cylindrical surface highest, and then observe the spread waveform of the bottom wave at this time with an oscilloscope;

[0043] Step seven, detection of front left oblique +70° probe and rear right oblique -70° probe: rotate the rail wheel 4 to the right by an angle 2a, move the rail wheel 4 to align the front left oblique +70° probe and the rear right oblique -70° probe with the cylindrical surfaces on the right and left sides of the test block in turn, adjust the position of the rail wheel 4 to make the amplitude of the first bottom wave of the cylindrical surface highest, and then observe the spread waveform of the bottom wave at this time with an oscilloscope;

[0044] Step eight, calculate the time T 3i of three periods of the i-th probe according to the formula T 2i = t 1i -t 3i , where i = 1, 2, 3, 4, 5, 6, 7, 8, 9, t 1i is the time of the first peak of the i-th probe, and t 2i is the time of the second peak after the peak value point of the i-th probe.

[0045] Step nine, calculate the echo frequency f i of the i-th probe according to the formula f .

[0046] Need to explain, the construction of steel rail wheel probe echo frequency detection system, utilize in the upper part of the column processing and manufacturing semicircle, semicircle symmetric structure is arranged in the upper part of the column, the rectangular outer surface of semicircle is upward and coplanar with the upper surface of the column, the column and semicircle are processed and manufactured as a whole, realize that a test block can complete the detection of 9 probes, the use effect is good, improve the detection efficiency, utilize the detection 0° probe center, utilize the detection of front + 37° probe and front + 70° probe, also can further satisfy the detection of rear-37° probe and rear-70° probe, improve the detection efficiency, the steel rail probe wheel left rotation, complete the detection of front right oblique + 70° probe and rear left oblique-70° probe, the steel rail probe wheel right rotation, complete the detection of front left oblique + 70° probe and rear right oblique-70° probe, utilize a test block to complete the detection of 9 probes, finally utilize the time of three cycles of each probe to calculate the echo frequency of each probe, detection is convenient and efficient.

[0047] In the embodiment, the height of the column 1 is 225mm, the length and width of the column 1 are both 80mm, the diameter of the flat-bottom hole 3 is 2mm, and the height of the flat-bottom hole 3 is 25mm.

[0048] In the embodiment, the diameter of the semicircular section of the semicircular column 2 is 200mm, and the thickness of the semicircular column 2 is 40mm.

[0049] In the embodiment, the column 1 and the semicircular column 2 are processed and manufactured as a whole, and the special test block of the column 1 and the semicircular column 2 processed and manufactured as a whole is a No. 20 low-carbon steel special test block.

[0050] In the embodiment, the grain size of the special test block of the column 1 and the semicircular column 2 processed and manufactured as a whole is 7-8 grade.

[0051] Need to explain, the special test block of the column 1 and the semicircular column 2 processed and manufactured as a whole is a No. 20 low-carbon steel special test block.

[0052] As shown in Figure 1 9 probes 5 are 0° probe, front + 37° probe, rear-37° probe, front + 70° probe, rear-70° probe, front left oblique + 70° probe, front right oblique + 70° probe, rear left oblique-70° probe, and rear right oblique-70° probe, respectively.

[0053] When the application is used, a flaw detector, a 9-channel probe wheel, an oscilloscope, and water coupling agent are taken as examples to detect the echo frequency of the steel rail wheel probe, and the detection results are shown in Table 1.

[0054] Table 1

[0055]

[0056]

[0057] The above merely illustrates the preferred embodiments of the present application, and is not intended to limit the present application. Any simple modification, change and equivalent structural change of the above embodiments according to the technical essence of the present application are still within the protection scope of the present application.

Claims

1. A method of rail wheel probe echo frequency detection, characterized by, The method comprises the following steps: Step one, constructing a rail wheel probe echo frequency detection system: the rail wheel probe echo frequency detection system comprises a test block, an ultrasonic detector and an oscilloscope for assisting in detecting the echo frequency of the probe (5) in the rail wheel (4) of the double-track flaw detection vehicle, wherein the signal output ends of the probes (5) are connected with the ultrasonic detector, the probe (5) has 9 probes (5), and the order of the 9 probes (5) is 0° probe, front +37° probe, rear -37° probe, front +70° probe, rear -70° probe, front left oblique +70° probe, front right oblique +70° probe, rear left oblique -70° probe and rear right oblique -70° probe; The test block comprises a column (1) in a cuboid structure and a semi-cylinder (2) arranged on the upper portion of the column (1), the semi-cylinder (2) is arranged on the upper portion of the column (1) in a symmetrical structure, the rectangular outer surface of the semi-cylinder (2) faces upward and is coplanar with the upper surface of the column (1), the two semicircular outer surfaces of the semi-cylinder (2) are arranged in parallel with a group of vertical outer surfaces opposite to the column (1), the length and width of the column (1) are equal, the length of the column (1) is less than the height of the column (1), the height of the column (1) is greater than the diameter of the semicircular cross section of the semi-cylinder (2), the thickness of the semi-cylinder (2) is less than the length of the column (1), and the center position of the bottom of the column (1) is provided with a flat-bottom hole (3), and the diameter of the semicircular cross section of the semi-cylinder (2) is greater than the diameter of the rail wheel (4); Step two, detection preparation: press the rail wheel (4) on the test block, add appropriate coupling agent in the middle, and keep stable acoustic coupling; Step three, detection of the 0° probe: move the 0° probe in the rail wheel (4) to align the flat-bottom hole (3) on the bottom surface of the test block, appropriately adjust the position of the rail wheel (4) to make the bottom wave amplitude of the flat-bottom hole (3) highest, and then observe the spread waveform of the bottom wave at this time by using the oscilloscope; Step four, detection of the front +37° probe and the front +70° probe: sequentially move the rail wheel (4) to align the front +37° probe and the front +70° probe in the wheel to the cylindrical surface on the left side of the test block, appropriately adjust the position of the rail wheel (4) to make the cylindrical surface have the highest first bottom wave amplitude, and observe the spread waveform of the bottom wave at this time by using the oscilloscope; Step five, detection of the rear -37° probe and the rear -70° probe: sequentially move the rail wheel (4) to align the rear -37° probe and the rear -70° probe in the wheel to the cylindrical surface on the right side of the test block, appropriately adjust the position of the rail wheel (4) to make the cylindrical surface have the highest first bottom wave amplitude, and observe the spread waveform of the bottom wave at this time by using the oscilloscope; Step six, detection of the front right oblique +70° probe and the rear left oblique -70° probe: the inclination angle of the front and rear oblique 70° probes of the rail wheel (4) is a, the rail wheel (4) is rotated by an angle a to the left, and the front right oblique +70° probe and the rear left oblique -70° probe are sequentially moved to align the cylindrical surfaces on the left and right sides of the test block, the position of the rail wheel (4) is appropriately adjusted to make the cylindrical surface have the highest first bottom wave amplitude, and the spread waveform of the bottom wave at this time is observed by using the oscilloscope. Step seven, detection of front left oblique +70° probe and rear right oblique -70° probe: rotate the rail probe (4) right by 2a angle, move the rail probe (4) in turn to make the front left oblique +70° probe and the rear right oblique -70° probe align with the cylindrical surface on the right and left sides of the test block, adjust the position of the rail probe (4) to make the first bottom wave amplitude of the cylindrical surface highest, and observe the spread waveform of the bottom wave at this time by using the oscilloscope; Step 8: According to formula T 3i =t 2i -t 1i , calculate the time T of the three cycles of the i-th probe 3i , where i = 1, 2, 3, 4, 5, 6, 7, 8, 9, t 1i is the previous peak time of the highest peak in the echo waveform of the i-th probe, t 2i The second peak time after the peak point of the highest peak in the echo waveform of the i-th probe; Step nine, calculate the echo frequency f of the ith probe according to the formula f = 2 * V / D i .

2. A method of rail wheel probe echo frequency detection according to claim 1, characterised in that: The height of the column (1) is 225 mm, the length and width of the column (1) are both 80 mm, the diameter of the flat-bottom hole (3) is 2 mm, and the height of the flat-bottom hole (3) is 25 mm.

3. A method of rail wheel probe echo frequency detection according to claim 1, wherein: The diameter of the semicircular section of the semicircular column (2) is 200 mm, and the thickness of the semicircular column (2) is 40 mm.

4. A method of rail wheel probe echo frequency detection according to claim 1, wherein: The column (1) and the semicircular column (2) are processed as one body, and the special test block with the column (1) and the semicircular column (2) processed as one body is a special test block for No. 20 low-carbon steel.

5. A method of rail wheel probe echo frequency detection according to claim 4, wherein: The grain size of the special test block with the column (1) and the semicircular column (2) processed as one body is 7-8 grade.

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