Probe layout method suitable for different standard rail welded joints

Abstract

This invention proposes a method for adjusting the probe layout, relating to the field of rail welding technology. It utilizes ultrasonic probes distributed on a scanning device to detect rail weld joints. The ultrasonic probes comprise at least two sets of paired ultrasonic transmitting probes A and receiving ultrasonic probes B, moving relative to or away from each other along the rail length direction, for flaw detection of the rail weld joints. The distribution of each set of ultrasonic probes is determined by the rail height H, rail width W, and rail length direction R. L The system consists of three coordinate points. Based on the coordinates set for the ultrasonic probe positions of various standard rails, the ultrasonic probe group, consisting of transmitting ultrasonic probe A and receiving ultrasonic probe B, is adjusted to the coordinates of the ultrasonic probe positions to achieve flaw detection of welded joints of various standard rails. This probe layout adjustment method enables the use of a single flaw detection device to automatically adjust the probe positions and complete flaw detection of joints of various rail types.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rail welding, in particular to a probe layout method suitable for rail welding joints of different rail types. BACKGROUND

[0002] At present, the rail welding joint (hereinafter referred to as "joint") is an important part of the seamless line, and the internal quality of the joint is the key prerequisite for ensuring the safe operation of high-speed railways. In the process of rail welding, ultrasonic flaw detection is required for each joint to ensure that no defects exceeding the standard appear in the joint. According to the requirements of the railway industry standard TB / T2658.21 and the national railway group standard Q / CR707-2019: the scanning device used for factory or base welding seams should be able to perform K-type scanning on the rail head, rail waist and rail bottom.

[0003] The existing technical solution is to use a small scanning frame, and a plurality of ultrasonic probes are installed on both sides of the scanning frame. The relative positions of the probes on each side are fixed, and the probes on the front and back sides are moved with a certain positional relationship through a transmission mechanism, so that the ultrasonic waves emitted by one side of the probe are directed to the weld of the rail joint and reflected back to the other side of the probe. The receiving probe transmits the signal to the signal processing device, which displays the readable pattern on the screen. However, the layout of the probes cannot be adjusted, only one type of joint can be detected, and the number of probes is small, which requires manual assistance to adjust the detection position. SUMMARY

[0004] The purpose of the present application is to design an adjustment method for the layout of the probes, which realizes the detection of joints of multiple rail types by automatically adjusting the positions of the probes with one detection device.

[0005] To achieve the above purpose, the present application designs a probe layout method suitable for rail welding joints of different standard rail types, which detects the rail welding joint through the ultrasonic probes distributed on the scanning device; wherein the ultrasonic probes include a set of at least two pairs of ultrasonic probes A and B arranged in pairs and moving in opposite or opposite directions along the length direction of the rail, which are used for ultrasonic flaw detection of the rail welding joint; the distribution position of each group of ultrasonic probes is determined by the height H of the rail, the rail head width W1 or the rail bottom width W2 and the length direction R of the rail LThree coordinate points are composed; wherein the coordinate point height and width are set according to the size of the rail height H and the rail width W of the detected standard rail profile detection position; the coordinate point along the rail length direction is set according to the length L of the ultrasonic probe and the rail height H; the ultrasonic probe position set according to the coordinate of the ultrasonic probe set by various standard rails is adjusted to the coordinate of the ultrasonic probe position, and the ultrasonic probe group composed of the transmitting ultrasonic probe A and the receiving ultrasonic probe B is adjusted to the coordinate of the ultrasonic probe position, so that the ultrasonic detection of the joints of various standard rails is realized.

[0006] Compared with the prior art, the layout method of the probe provided by the application is that the distribution position of the ultrasonic probe is set according to the size of the rail height H and the rail width W of the detected rail profile detection position and the length L of the ultrasonic probe, and when the rail profile of the detected rail changes, the distribution position of the ultrasonic probe also changes, so that only one set of probes is used to realize the ultrasonic detection of the joints of different standard rail profiles through the adjustment of the distribution position of the ultrasonic probe, for example, the ultrasonic detection of the joints of 50kg / m, 60kg / m and 75kg / m three different rail profiles can be realized through the probe layout method provided by the application. BRIEF DESCRIPTION OF DRAWINGS

[0007] The drawings described herein are only for illustrative purposes, and are not intended to limit the scope of the present application in any way. In addition, the shapes and scale sizes of the components in the drawings are only illustrative, and are used to help understand the present application, and are not specific limitations on the shapes and scale sizes of the components of the present application. Those skilled in the art can select various possible shapes and scale sizes according to specific circumstances to implement the present application under the guidance of the present application.

[0008] Figure 1 The ultrasonic probe coordinate distribution diagram of the first embodiment of the present application is shown in FIG. 1.

[0009] Figure 2 The ultrasonic route diagram of the first embodiment of the present application is shown in FIG. 2. Figure 1

[0010] Figure 3 The ultrasonic probe coordinate distribution diagram of another embodiment of the present application is shown in FIG. 3.

[0011] Figure 4 The ultrasonic route diagram of the rail head and rail bottom probe of the first embodiment of the present application is shown in FIG. 4. Figure 3

[0012] The ultrasonic probe coordinate distribution diagram of another embodiment of the present application is shown in FIG. 5. Figure 5

[0013] Figure 6 The ultrasonic route diagram of the rail head and rail bottom probe of the first embodiment of the present application is shown in FIG. 6. Figure 5 ​​Ultrasonic route diagram of rail head and rail bottom probe;

[0014] Figure 7 For the main size of the rail section diagram;

[0015] Figure 8 For the narrow scan frame probe coordinate distribution diagram in the present application

[0016] Figure 9 For the wide scan frame probe coordinate distribution diagram in the present application.

[0017] Explanation of reference signs:

[0018] 10, rail top; 20, rail head;

[0019] 30, rail head side; 40, rail bottom;

[0020] 50, rail bottom side; L, length of ultrasonic probe;

[0021] H, height of rail section profile;

[0022] W1, rail head width of rail section profile; W2, rail bottom width of rail section profile;

[0023] A1, A2, A3, A4, A5, A6, B1, B2, B3, B4, B5, B6, probe number. DETAILED DESCRIPTION

[0024] The details of the present application can be more clearly understood in connection with the drawings and the following description of specific embodiments of the present application. However, the specific embodiments of the present application described herein are intended for the purpose of illustration only and are not intended to be limiting in any way. Those skilled in the art can conceive of any possible variations based on the present application under the teachings of the present application, which should be considered to fall within the scope of the present application.

[0025] As Figures 1 to 6 described, the present application proposes a probe layout method suitable for different rail type rail welded joints, which detects the rail welded joints by ultrasonic probes distributed on the scanning device; the ultrasonic probes include a set of at least two groups of ultrasonic probes moving along the length direction of the rail; each group of ultrasonic probes is composed of a pair of ultrasonic probe A and ultrasonic probe B arranged to transmit ultrasonic waves, which detects the rail welded joints from both sides of the rail; the distribution position of each group of ultrasonic probes is composed of three coordinate points, including height coordinate point, width coordinate point and length coordinate point; as L shown, wherein the height coordinate point and the width coordinate point are determined according to the height H1 of the detection position of the cross-sectional profile of the rail type rail, the rail head width W1 and the rail bottom width W2 along the length direction R of the rail Figure 5 .L The coordinate points are set according to the length L of the ultrasonic probe and the rail height H2; the coordinates set according to the position of the ultrasonic probe set for various rails; the ultrasonic probe set composed of the transmitting ultrasonic probe A and the receiving ultrasonic probe B is adjusted to the coordinates of the position to be detected by the ultrasonic probe, and the ultrasonic probe set is moved along the length direction of the rail to detect the weld joints of various rails.

[0026] The distribution position of the ultrasonic probe is set according to the rail height H and the rail width W of the detection position of the rail profile of the detected rail type and the length L of the ultrasonic probe, and when the rail type of the detected rail type changes, the distribution position of the ultrasonic probe also changes, so that only one set of probes is used to realize the detection of the joints of different standard rail types by adjusting the distribution position of the ultrasonic probe, for example, the probe layout method provided by the application can realize the detection of the joints of three different rail types of 50kg / m, 60kg / m and 75kg / m.

[0027] The distribution position of each group of ultrasonic probes is determined by the rail height H, the rail head width W1 or the rail bottom width W2 and the length direction R of the rail L The three coordinate points are composed of,

[0028] In an optional embodiment of the application, the coordinate points of the distribution position of each group of ultrasonic probes can be determined by a plane coordinate system X, Y (such as Figure 7 The X-axis of the plane coordinate system is arranged along the center line of the length of the rail, and the Y-axis is arranged perpendicular to the length of the rail; the coordinates Xa and Ya of the transmitting ultrasonic probe defined in the plane coordinate system X, Y are determined; the coordinates Xb and Yb of the transmitting ultrasonic probe B defined in the plane coordinate system X, Y are determined. The above plane coordinate system can be understood as the top view direction of the rail, which is convenient for more clearly showing the movement process of each probe.

[0029] In an optional embodiment of the application, at least two groups of transmitting ultrasonic probes A and receiving ultrasonic probes B form a set of ultrasonic probes, and the transmitting ultrasonic probes A and the receiving ultrasonic probes B are arranged to move in the X-axis direction horizontally arranged along the length direction of the rail.

[0030] In an optional embodiment of the application, each group of transmitting ultrasonic probes A and receiving ultrasonic probes B is distributed at the detected position on the same side of the rail.

[0031] In an alternative embodiment of the present application, the ultrasonic probes for detecting the steel rail include at least two groups of ultrasonic probes arranged on the top of the rail head, which are A3 and B3, A4 and B4, respectively, for detecting the welded joint of the rail head position of different standard rail types; the ultrasonic probes on the top of the rail head are K1 oblique probes.

[0032] In an alternative example of this embodiment, the coordinates A3 and B3, A4 and B4 of the ultrasonic probes on the top of the rail head take the top center line in the length direction of the rail as the coordinate origin, and are calculated by the following method:

[0033] Xa3=H-L / 2, Ya3=0; Xb3=0, Yb3=0;

[0034] Xa4=H+L / 2, Ya4=0; Xb4=-2H, Yb4=0;

[0035] wherein H is the height of the standard rail cross-sectional profile; L is the length of the ultrasonic probe.

[0036] In an alternative example of this embodiment, the ultrasonic probes for detecting the steel rail further include at least two groups of ultrasonic probes A5 and B5, A6 and B6 arranged on the two sides of the rail head; the two groups of ultrasonic probes A5 and B5, A6 and B6 are arranged on the two sides of the rail welded joint, respectively.

[0037] Further, the coordinates of the ultrasonic probes A5 and B5, A6 and B6 take the top center line in the length direction of the rail as the coordinate origin, and are calculated by the following method:

[0038] Xa5=H / 2-L / 4+W1 / 2, Ya5=W1; Xb5=H / 2-L / 4-W1 / 2, Yb5=W1;

[0039] Xa6=-H / 2+L / 4+W1 / 2, Ya6=-W1; Xb6=-H / 2+L / 2-W1 / 2, Yb5=-W1;

[0040] wherein H is the height of the standard rail cross-sectional profile; W1 is the width of the rail head of the standard rail type; L is the length of the ultrasonic probe.

[0041] In an alternative embodiment of the present application, the detection positions of a set of ultrasonic probes can be combined by the coordinates of the two groups of ultrasonic probes A3 and B3, A4 and B4 for detecting the top of the rail head, and the coordinates of the two groups of ultrasonic probes A5 and B5, A6 and B6 for detecting the two sides of the rail head.

[0042] In an alternative embodiment of the present application, the ultrasonic probe set for detecting the steel rail further comprises at least two groups of ultrasonic probes A1 and B1, A2 and B2 arranged at the rail bottom for detecting the welded joint of the rail bottom of the steel rail of different standard rail types, wherein the two groups of ultrasonic probes A1 and B1, A2 and B2 are arranged at two sides of the welded joint of the rail bottom of the steel rail and detect the welded joint of the rail bottom of the steel rail.

[0043] In an alternative example of the embodiment, the coordinates of the ultrasonic probes A1 and B1, A2 and B2 arranged at the rail bottom take the center of the weld seam of the welded joint of the steel rail as the origin of the coordinate system, and are calculated by the following method:

[0044] Xa1=H / 2-L / 4+W2 / 2, Ya1=W2; Xb1=H / 2-L / 4-W2 / 2, Yb1=0;

[0045] Xa2=L / 4+W2 / 2-H / 2, Ya2=-W2; Xb2=-H / 2+L / 4-W2 / 2, Yb2=-W2;

[0046] wherein H is the sectional profile height of the standard steel rail, W2 is the width of the rail bottom of the steel rail of the standard rail type, and L is the length of the ultrasonic probe.

[0047] In an alternative embodiment of the present application, the detection position of the ultrasonic probe set is composed of the coordinates of the two groups of ultrasonic probes A3 and B3, A4 and B4 arranged at the rail top and the coordinates of the ultrasonic probes A1 and B1, A2 and B2 arranged at the rail bottom, and the range of the coordinates of the two groups of ultrasonic probes A3 and B3, A4 and B4 arranged at the rail top along the X axis is not less than the range of the coordinates of the ultrasonic probes A1 and B1, A2 and B2 arranged at the rail bottom along the X axis.

[0048] In an alternative embodiment of the present application, the ultrasonic probe set is composed of at least two groups of transmitting ultrasonic probes A and receiving ultrasonic probes B arranged at two sides of the steel rail to be detected for detecting the welded joint of the steel rail from two sides of the welded joint of the steel rail.

[0049] In an alternative example of the embodiment, the two groups of ultrasonic probes arranged at two sides of the steel rail to be detected are arranged at two scanning frames; at least one scanning frame drives the X axis direction arranged horizontally along the length of the steel rail to move relatively or oppositely.

[0050] Further, the ultrasonic probes arranged on the scanning frame are controlled to move to the detection coordinates of the steel rail to be detected on the scanning frame.

[0051] In an alternative embodiment of the present application, the at least two pairs of ultrasonic probes are formed by more than two pairs of ultrasonic probes.

[0052] The principles and implementation procedures of the probe layout method suitable for different rail type rail welded joints are described in detail in combination with an embodiment.

[0053] In this embodiment, as shown in Figure 7 , 12 ultrasonic probes are arranged, in which the transmitting ultrasonic probes A3 and A4 and the receiving ultrasonic probes B3 and B4 are K1 oblique probes arranged on the top surface of the rail; the transmitting ultrasonic probes A5 and A6 and the receiving ultrasonic probes B5 and B6 are K1 oblique probes arranged on the side surface of the rail head; and the transmitting ultrasonic probes A1 and A2 and the receiving ultrasonic probes B1 and B2 are K1 oblique probes arranged on the side surface of the rail bottom. The transmitting ultrasonic probes A1, A3, A5 and A2, A4, A6 are installed on a narrow scanning frame (as shown in Figure 8 ), and the receiving ultrasonic probes B1, B3, B5 and B2, B4, B6 are installed on a wide scanning frame (as shown in Figure 9 ). The wide and narrow scanning frames cooperate with each other to realize the flaw detection scanning of the joint.

[0054] In order to describe the layout positions of each probe, a coordinate system as shown in Figure 7 is established. The coordinates of the transmitting ultrasonic probes A1, A2, A3, A4, A5, A6 and the receiving ultrasonic probes B1, B2, B3, B4, B5 and B6 are respectively (Xa1, Ya1), (Xa2, Ya2), (Xa3, Ya3), (Xa4, Ya4), (Xa5, Ya5), (Xa6, Ya6), (Xb1, Yb1), (Xb2, Yb2), (Xb3, Yb3), (Xb4, Yb4), (Xb5, Yb5), (Xb6, Yb6). The rail height is H, the rail head width is W1, the rail bottom width is W2, and the length of each probe is L.

[0055] The ultrasonic route of the probe arranged on the rail top (as shown in Figure 1 ) is as shown in Figure 2 . After being emitted into the rail at 45°, the ultrasonic wave bounces back twice and is received by another probe. The ultrasonic route of the probe arranged on the rail head and the rail bottom (as shown in Figure 3 , Figure 5 ) is as shown in Figure 4 , Figure 6 . After being emitted into the rail at 45°, the ultrasonic wave bounces back once and is received by another probe.

[0056] According to the linear propagation and symmetrical reflection characteristics of ultrasonic waves, the following is calculated:

[0057] Xa1 = H / 2 - L / 4 + W2 / 2, Ya1 = W2;

[0058] Xa2 = H / 2 - L / 4 - W2 / 2, Ya2 = -0;

[0059] Xa3 = H - L / 2, Ya3 = 0;

[0060] Xa4 = 0, Ya4 = 0;

[0061] Xa5 = H / 2 - L / 4 + W1 / 2, Ya5 = W1;

[0062] Xa6 = -H / 2 - L / 4 - W1 / 2, Ya6 = W1;

[0063] Xb1 = L / 4 + W2 / 2 - H / 2, Yb1 = -W2;

[0064] Xb2 = -H / 2 + L / 4 - W2 / 2, Yb2 = -W2;

[0065] Xb3 = H + L / 2, Yb3 = 0;

[0066] Xb4 = -2H, Yb4 = 0;

[0067] Xb5 = -H / 2 + L / 4 + W1 / 2, Yb5 = -W1;

[0068] Xb6 = -H / 2 + L / 2 - W1 / 2, Yb5 = -W1;

[0069] In the embodiment, the rail section can be three sizes, specifically:

[0070] The main dimensions of the 50kg / m rail type rail are: H = 152, W1 = 70, W2 = 132;

[0071] The main dimensions of the 60kg / m rail type rail are: H = 176, W1 = 71, W2 = 150;

[0072] The main dimensions of the 75kg / m rail type rail are: H = 192, W1 = 72, W2 = 150.

[0073] According to the above data, the coordinates of all probes can be obtained, and the probe position diagrams of the wide flaw detection frame and the narrow flaw detection frame are obtained, such as Figure 7 , Figure 8 and Figure 9 .

[0074] The implementation process is as follows:

[0075] Before starting detection, the rail type is selected manually, and all probes are moved to the corresponding positions by a transmission mechanism. When detecting a rail with a gauge of 50kg / m, the probe position relationship is shown in Figure 5 , the probe layout during detection is shown in Figure 6 ; when detecting a rail with a gauge of 60kg / m, the probe position relationship during detection is shown in Figure 7 , the probe layout is shown in Figure 8 ; when detecting a rail with a gauge of 75kg / m, the probe position relationship is shown in Figure 9 , the probe layout during detection is shown in Figure 7 .

[0076] The wide and narrow detection frames are moved close to the rail by a transmission mechanism until all probes are positioned as shown in Figure 1 . At this time, the ultrasonic probes A1, A3 and A5 emit ultrasonic waves, while B1, B3 and B5 are in a receiving state. The narrow detection frame moves to the left and the wide detection frame moves to the right at the same speed until A4 and B4 are in contact, which is the right side scanning stage of the joint. Then, A2, A4 and A5 emit ultrasonic waves, while B2, B4 and B6 are in a receiving state. The narrow detection frame moves to the right and the wide detection frame moves to the left at the same speed until A4 and B4 are in contact, which is the left side scanning stage of the joint, and the scanning is completed.

[0077] The detailed explanations of the above-mentioned embodiments are only for the purpose of explaining the present application so as to better understand the present application, but these descriptions cannot be interpreted as limiting the present application in any way, and in particular, the features described in different embodiments can be combined with each other at will to form other embodiments, and these features should be understood as being applicable to any one embodiment, rather than being limited to the described embodiments, except for the explicit opposite description.

Claims

1. A probe layout method applicable to welded joints of rails of different standard rail types, wherein ultrasonic probes distributed on a scanning device are used to detect welded joints of rails; characterized in that, The ultrasonic probe comprises at least two sets of transmitting ultrasonic probes A and receiving ultrasonic probes B, arranged in pairs and moving relative to or opposite to each other along the length of the rail, for flaw detection of rail welded joints; the distribution of each set of ultrasonic probes is determined by the rail height H, the rail head direction W1, the rail base width W2, and the rail length direction R. L The test consists of three coordinate points; the rail height H and rail base width W2 are set according to the model of the standard rail type being tested; the coordinate points along the rail length are set according to the length L of the ultrasonic probe and the rail height H; based on the coordinates set by the ultrasonic probe position for various standard rails, the ultrasonic probe group consisting of the transmitting ultrasonic probe A and the receiving ultrasonic probe B is adjusted to the coordinates of the ultrasonic probe position to realize the flaw detection of welded joints of various standard rails. The coordinates of the distribution positions of each group of ultrasonic probes are set by a plane coordinate system X and Y; wherein the X-axis of the coordinate system is set horizontally along the center line of the rail, and the Y-axis is set along the center line of the rail width W; the coordinates Xa and Ya of the transmitting ultrasonic probe A are determined in the plane coordinate system X and Y; the coordinates Xb and Yb of the transmitting ultrasonic probe B are determined in the plane coordinate system X and Y. An ultrasonic probe set for detecting standard rail type steel rail includes at least two sets of ultrasonic probes A3 and B3, A4 and B4 set on the top of the rail head, two sets of ultrasonic probes A5 and B5, A6 and B6 set on the two sides of the rail head, and two sets of ultrasonic probe coordinates A1 and B1, A2 and B2 set on the bottom of the rail. Two sets of ultrasonic probes A3 and B3, A4 and B4 are set on the top of the rail head to detect the welded joints at the rail head position of rails of different standard rail types; the ultrasonic probe on the top of the rail head is a K1 angled probe. The coordinates of the ultrasonic probes A3 and B3, A4 and B4 at the top of the rail head are calculated using the following method, with the top centerline of the rail along its length as the origin: Xa3=HL / 2, Ya3=0; Xb3=H+L / 2, Yb3=0; Xa4=0, Ya4=0; Xb4=-2H, Yb4=0; Where H is the height of the standard rail cross-section profile; L is the length of the ultrasonic probe; Two sets of ultrasonic probes, A5 and B5, are set on the two sides of the rail head, while A6 and B6 are set on both sides of the rail welded joint. The ultrasonic probe set used for detecting standard rail type steel rail includes at least two sets of ultrasonic probes A5 and B5, A6 and B6 set on two sides of the rail head; the two sets of ultrasonic probes A5 and B5, A6 and B6 are respectively set on both sides of the rail weld joint. Two sets of ultrasonic probes, coordinates A1 and B1, A2 and B2, are set at the bottom of the rail to detect the welded joints at the bottom of rails of different standard rail types. The two sets of ultrasonic probes A1 and B1, A2 and B2 are respectively set on both sides of the welded joint at the bottom of the rail; to detect the welded joint at the bottom of the rail. The coordinates of the ultrasonic probes A1 and B1, A2 and B2 at the bottom of the rail are calculated using the following method, with the center of the weld seam at the bottom of the rail welded joint as the origin of the coordinate system: Xa1=H / 2-L / 4+W2 / 2, Ya1=W2; Xb1=L / 4+W2 / 2-H / 2, Yb1=-W2; Xa2=H / 2-L / 4-W2 / 2, Ya2=-0; Xb2=-H / 2+L / 4-W2 / 2, Yb2=-W2; Where: H is the cross-sectional profile height of the standard rail; W2 is the width of the base of the standard rail; L is the length of the ultrasonic probe; The ultrasonic probe, mounted on the scanning frame, is controlled to move to the detection coordinates of the rail being detected according to the rail type.

2. The probe layout method for welded joints of rails of different standard rail types as described in claim 1, characterized in that, The ultrasonic probe, consisting of at least two sets of transmitting ultrasonic probes A and receiving ultrasonic probes B, moves along the rail in a manner that is relative to or opposite to each other along the horizontal X-axis direction along the length of the rail.

3. The probe layout method for welded joints of rails of different standard rail types as described in claim 1, characterized in that, Each set of transmitting ultrasonic probe A and receiving ultrasonic probe B is located at the detection position on the same side of the rail.

4. The probe layout method for welded joints of rails of different standard rail types as described in claim 1, characterized in that, The detection positions of the welded joints at the rail head of the rails of different standard rail types are formed by combining the two sets of detection coordinates A3 and B3, A4 and B4 at the top of the rail with the coordinates of the ultrasonic probes A1 and B1, A2 and B2 at the bottom of the rail; the range along the X-axis of the two sets of detection coordinates A3 and B3, A4 and B4 at the top of the rail is not less than the range along the X-axis of the ultrasonic probes A1 and B1, A2 and B2 at the bottom of the rail.

5. The probe layout method for welded joints of rails of different standard rail types as described in claim 1, characterized in that, The detection positions of the welded joints at the rail head of the rails of different standard rail types are formed by combining the two sets of detection coordinates A3 and B3, A4 and B4 at the top of the rail with the coordinates A5 and B5, A6 and B6 on both sides of the rail head and the coordinates of the ultrasonic probes A1 and B1, A2 and B2 at the bottom of the rail. The range along the X-axis of the two sets of detection coordinates A3 and B3, A4 and B4 at the top of the rail is not less than the range of the ultrasonic probes A1 and B1 at the bottom of the rail; the range along the X-axis of the coordinates A2 and B2 is not less than the range of the coordinates A5 and B5, A6 and B6 on both sides of the rail head and the coordinates of the ultrasonic probes A1 and B1, A2 and B2 at the bottom of the rail.

6. The probe layout method for welded joints of rails of different standard rail types as described in claim 1 or 2, characterized in that, The ultrasonic probe, consisting of at least two sets of transmitting ultrasonic probes A and receiving ultrasonic probes B, is respectively set on both sides of the standard rail type being detected, and detects the rail weld joint from both sides of the rail weld joint.

7. The probe layout method for welded joints of rails of different standard rail types as described in claim 6, characterized in that, The ultrasonic probe groups set on both sides of the standard rail being probed are respectively set on scanning frames on both sides; at least one scanning frame drives the probes to move relative to or opposite to each other along the horizontal X-axis direction along the length of the rail.

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