Wind power planetary gear tooth surface end face ultrasonic contrast test block

Abstract

The present application relates to wind power gear nondestructive testing technical field, specifically relates to wind power planetary wheel toothed surface end face ultrasonic comparison test block, including test block body, the test block body and the detected wind power planetary wheel material are same, the profile of the test block body is shaped in the local tooth profile of wind power planetary wheel, contains the concave surface for simulating the root area and the convex surface for simulating the addendum area, when using, through the function of multiple test blocks is concentrated to a set of comparison test block, only a set of standard test block can realize double-crystal straight probe DGS curve and single straight probe DAC curve sensitivity calibration and flaw detection result defect judgement, and can simultaneously obtain "signal-to-noise ratio", "zero velocity calibration", "vertical linearity" and "horizontal linearity" and other index data, test is convenient, and reliability is high, can satisfy a variety of test requirements use, and can effectively reduce the deviation difference of the judgment of flaw detection result caused by the calibration of conventional ultrasonic test block flaw detection system.

Description

Technical Field

[0001] This invention relates to the field of non-destructive testing technology for wind turbine gears, and in particular to an ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear. Background Technology

[0002] Defects in wind turbine gears are typically detected using ultrasonic testing systems. These systems include ultrasonic flaw detectors, ultrasonic flaw detection comparison blocks, and ultrasonic probes. The ultrasonic flaw detection comparison block is a simple-shaped artificial reflector designed and manufactured for a specific purpose. It serves to determine detection sensitivity, test the overall performance of the instrument and probe, adjust the sound wave velocity, and evaluate the size of defects. Currently, wind turbine gear manufacturers typically use a single flat-bottomed hole sample made of the same material and with a similar heat treatment process as the ultrasonic flaw detection comparison block. Using this comparison block to create a DGS (Distance-Gain-Size) flaw detection curve can quickly determine the scanning sensitivity and defect evaluation efficiency of the wind turbine gears.

[0003] For example, Chinese patent application number CN 202111533171.7 discloses a comparative test block and its usage method for ultrasonic testing of wind turbine main shaft forgings. The comparative test block includes six surfaces: an upper surface, two parallel side surfaces, a rear end surface, a front end surface, and a lower surface. In use, ultrasonic probe A is placed on the front end surface of the comparative test block, or ultrasonic probe B is placed on the upper surface. The test block has a compact structure, complete functions, simple operation, low testing cost, and high efficiency. However, when existing comparative test blocks are calibrated to a reference standard and applied to actual testing, the test results deviate significantly from the actual values ​​due to differences in gear material attenuation, interference from adjacent gear edge sidewalls, and limitations of the DGS curve method. This leads to significant disagreements between the supplier and the buyer regarding the test results. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose an ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear, in order to solve the technical problem that the test results obtained by the prior art have a large deviation from the actual values ​​due to differences in gear material attenuation, interference from the sidewalls of the adjacent gear edge, and limitations of the DGS curve method.

[0005] To achieve the above objectives, the present invention provides an ultrasonic comparison test block for the open tooth face of a wind turbine planetary gear, comprising a test block body, wherein the test block body is made of the same material as the wind turbine planetary gear being tested, and the outline of the test block body is modeled after a local tooth profile of the wind turbine planetary gear, including a concave curved surface for simulating the tooth root region and a convex curved surface for simulating the tooth tip region, and the test block body is provided with a set of flat-bottomed holes for generating DGS curves and sensitivity calibration.

[0006] Furthermore, the test block body is made of 18CrNiMo gear steel, and the forging process and heat treatment process of the test block body are the same as those of the wind turbine planetary gear being tested. The grain size of the test block body is uniform and the grain size grade is higher than that of the planetary gear average grain size.

[0007] Furthermore, the flat-bottomed hole group consists of eight groups of flat-bottomed holes arranged in the sound path direction with a group spacing of 50mm ranging from 50mm to 400mm. In the direction parallel to the ultrasonic beam, four more groups are arranged with a group spacing of 10mm ranging from 10mm to 40mm, based on the outer arc surface, forming 32 flat-bottomed holes. The size of the flat-bottomed hole is φ0.6mm and the depth is 20mm.

[0008] Furthermore, the 32 flat-bottomed holes include: The first set of flat-bottomed holes, 10mm from the outer arc surface: A1, B1, C1, D1, E1, F1, G1, H1; The second set of flat-bottomed holes, 20mm from the outer arc surface: A2, B2, C2, D2, E2, F2, G2, H2; The third set of flat-bottomed holes, 30mm from the outer arc surface: A3, B3, C3, D3, E3, F3, G3, H3; The fourth set of flat-bottomed holes, 40mm from the outer arc surface: A4, B4, C4, D4, E4, F4, G4, H4; Among them, AH correspond to sound path distances of 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, and 400mm, respectively.

[0009] Furthermore, the first set of flat-bottomed holes A1, B1, C1, D1, E1, F1, G1, and H1 are used for DAC curve generation and defect quantitative judgment in the area 10mm away from the outer arc surface; The second set of flat-bottomed holes A2, B2, C2, D2, E2, F2, G2, and H2 are used for DAC curve fabrication and quantitative defect determination in the area 10mm to 20mm from the outer arc surface; The third set of flat-bottomed holes A3, B3, C3, D3, E3, F3, G3, and H3 are used for DAC curve fabrication and quantitative defect determination in the area 20mm to 30mm from the outer arc surface; The fourth set of flat-bottomed holes A4, B4, C4, D4, E4, F4, G4, and H4 are used for DAC curve creation and quantitative defect determination in the area 30mm to 40mm from the outer arc surface.

[0010] Furthermore, flat-bottomed holes A1, A2, A3, and A4 with a sound path distance of 50 mm are used for the creation of DGS reference curves and quantitative determination of defects using dual-crystal straight probes, corresponding to curve numbers A1DGS, A2DGS, A3DGS, and A4DGS, respectively. Normal flaw detection inspection uses the A3DGS reference curve.

[0011] Furthermore, when abnormal reflections are observed during flaw detection and need to be recorded or assessed: When the abnormal reflection is within 10mm of the outer arc surface, select A1DGS for quantitative determination. When the abnormal reflection is within 20mm of the outer arc surface, select A2DGS for quantitative determination. When the abnormal reflection is within 30mm of the outer arc surface, select A3DGS for quantitative determination. When the abnormal reflection is more than 30mm away from the outer arc surface, select A4DGS for quantitative determination; The flat-bottomed holes A1, A2, A3, and A4 are used together for near-field detection of end faces and quantitative determination of defects.

[0012] Furthermore, the test block with a sound path distance of 200mm has a body height of 220mm and is used for zero-point sound velocity calibration and vertical linearity testing of the ultrasonic flaw detection system; the test block with a sound path distance of 50mm has a body height of 70mm and is used for horizontal linearity testing of the ultrasonic flaw detection system.

[0013] Furthermore, the fourth set of flat-bottomed holes, based on the DAC curve, generates a signal-to-noise ratio evaluation curve using -6dB, which is used for ultrasonic signal-to-noise ratio evaluation of the open end face of the planetary gear.

[0014] Furthermore, the inner and outer rim surfaces and the upper and lower end surfaces of the test block body are parallel to each other, and the roughness of all surfaces is less than Ra3.2.

[0015] The beneficial effects of this invention are as follows: In use, by concentrating the functions of multiple test blocks into a single set of comparison test blocks, only one set of standard test blocks is needed to achieve sensitivity calibration of the dual-crystal straight probe DGS curve and single-straight probe DAC curve, as well as defect evaluation of flaw detection results. It can also simultaneously acquire index data such as "signal-to-noise ratio", "zero-position sound velocity calibration", "vertical linearity" and "horizontal linearity". The test is convenient, highly reliable, and can meet various testing requirements. It can also effectively reduce the discrepancies in the evaluation of flaw detection results caused by the calibration of conventional ultrasonic test block flaw detection systems. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the ultrasonic comparison test block of the open tooth face end of the wind turbine planetary gear in this invention; Figure 2 This is a schematic diagram of the structure of flat-bottomed holes A1~A4 with A=50mm according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of flat-bottomed holes B1~B4 with B=100mm according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of flat-bottomed holes C1~C4 with a diameter of C=150mm according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of flat-bottomed holes D1~D4 with D=200mm according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of flat-bottomed holes E1~E4 with an E=250mm in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of flat-bottomed holes F1~F4 with F=300mm according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of flat-bottomed holes G1~G4 with G=350mm according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of flat-bottomed holes H1~H4 with H=400mm according to an embodiment of the present invention.

[0018] The diagram is marked as follows: 1. Test block body; 2. Concave curved surface; 3. Convex curved surface; 4. Flat bottom hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In a first aspect, this invention proposes an ultrasonic comparative test block for the open tooth face end of a wind turbine planetary gear, such as... Figure 1-9 As shown, it includes a test block body 1, which is made of the same material as the wind turbine planetary gear being tested. The outline of the test block body 1 is modeled after a local tooth profile of the wind turbine planetary gear. It includes a concave curved surface 2 for simulating the tooth root region and a convex curved surface 3 for simulating the tooth tip region. The test block body 1 is provided with a set of flat-bottomed holes for generating DGS curves and sensitivity calibration.

[0022] In this embodiment, the test block body 1 is required not only to be made of the same material as the wind turbine planetary gear being tested, but more importantly, its contour is modeled after the local tooth profile of the wind turbine planetary gear. This design includes a concave curved surface 2 for simulating the tooth root region and a convex curved surface 3 for simulating the tooth tip region, which can more realistically reproduce the propagation path and reflection characteristics of ultrasonic waves in the planetary gear tooth profile. This makes the sensitivity calibrated on the test block and the curve produced more accurately applicable to the detection of actual workpieces, significantly reducing the evaluation error caused by differences in geometric shape.

[0023] Meanwhile, the root and tip regions are stress concentration areas and common defect initiation areas. The surface of these regions is specially simulated, which makes the test block better used to evaluate the flaw detection capability and defect quantitative accuracy of these key areas.

[0024] In this embodiment, the test block body 1 is made of 18CrNiMo gear steel, and the forging process and heat treatment process of the test block body 1 are the same as those of the wind turbine planetary gear being tested. The grain size of the test block body 1 is uniform and the grain size grade is higher than that of the planetary gear, which ensures that the test block and the workpiece have a high degree of consistency in ultrasonic propagation characteristics such as sound velocity and attenuation coefficient, thus ensuring the accuracy of calibration from the material basis.

[0025] In this embodiment, the flat-bottomed hole group consists of eight groups of flat-bottomed holes 4 arranged in the sound path direction with a group spacing of 50 mm ranging from 50 mm to 400 mm. In the direction parallel to the ultrasonic beam, four more groups are arranged with a group spacing of 10 mm ranging from 10 mm to 40 mm, based on the outer arc surface, forming 32 flat-bottomed holes 4. The size of the flat-bottomed hole 4 is φ0.6 mm and the depth is 20 mm. The combination of eight test blocks and four flat-bottomed holes on the test blocks is used for "zero-position sound velocity calibration, vertical linearity and horizontal linearity testing, signal-to-noise ratio verification, DGS / DAC curve production, and quantitative defect evaluation".

[0026] In this embodiment, the 32 flat-bottomed holes 4 include: The first set of flat-bottomed holes 4, 10mm from the outer arc surface: A1, B1, C1, D1, E1, F1, G1, H1; The second set of flat-bottomed holes 4, 20mm from the outer arc surface: A2, B2, C2, D2, E2, F2, G2, H2; The third set of flat-bottomed holes 4, 30mm from the outer arc surface: A3, B3, C3, D3, E3, F3, G3, H3; The fourth set of flat-bottomed holes 40mm from the outer arc surface: A4, B4, C4, D4, E4, F4, G4, H4; Among them, AH correspond to sound path distances of 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, and 400mm, respectively. For a D=200mm flat-bottomed hole test block, the first reflected echo of the flat-bottomed hole was adjusted to 100% of the display scale and the sensitivity value (dB) was recorded. Then, the sensitivity was decreased by 2dB each time, and the percentage of the flat-bottomed hole reflected echo on the display scale was recorded each time, until the flat-bottomed hole reflected echo was displayed as 5%. The measured dB value was compared with the specified standard dB value and the difference was calculated to complete the vertical linearity test of the flaw detection system. The height of the flat-bottomed hole test block is 70mm. A=50mm plus the height of the flat-bottomed hole is 20mm. The first bottom wave of the 70mm body height is adjusted to 20% of the scale on the flaw detector display, and the fifth bottom wave is adjusted to 100% of the scale on the flaw detector display. The sound path scale values ​​of the second, third, and fourth bottom waves are read, and the difference in horizontal linearity is calculated. The horizontal linearity test of the flaw detection system is completed.

[0027] In this embodiment, the first set of flat-bottomed holes 4A1, B1, C1, D1, E1, F1, G1, H1 are used for DAC curve generation and defect quantitative judgment in the area 10mm away from the outer arc surface; The second set of flat-bottomed holes 4A2, B2, C2, D2, E2, F2, G2, and H2 are used for DAC curve fabrication and quantitative defect determination in the area 10mm to 20mm from the outer arc surface; The third set of flat-bottomed holes 4A3, B3, C3, D3, E3, F3, G3, and H3 are used for DAC curve fabrication and quantitative defect determination in the area 20mm to 30mm from the outer arc surface; The fourth set of flat-bottomed holes 4A4, B4, C4, D4, E4, F4, G4, and H4 are used for DAC curve creation and quantitative defect judgment in the area 30mm to 40mm from the outer arc surface; For the A1, A2, A3, and A4 flat-bottom holes of the A=50mm flat-bottom hole test block, the flaw detector was used in dual-crystal mode with the sensitivity reference mode set to flat-bottom hole. The first reflection echo of the A4 flat-bottom hole was adjusted to 80% of the scale on the display screen, and the dB value of this sensitivity was recorded. The DGS curve of the dual-crystal mode was generated. At the same time, the dB values ​​of the 80% sensitivity of the first reflection echo of the A1, A2, and A3 flat-bottom holes were measured and recorded. The difference between the first reflection echo and the 80% sensitivity of the A4 flat-bottom hole was calculated. This difference was used for flaw detection of near-surface defects on the end face of the planetary gear and for quantitative evaluation of defects at different distances from the outer arc after correction. On the outer arc surface, the first set of flat-bottomed holes A1, B1, C1, D1, E1, F1, G1, and H1 (10mm in diameter) are used. The flaw detector is set to DAC mode, and the reflected wave height of the eight flat-bottomed holes A1, B1, C1, D1, E1, F1, G1, and H1 is adjusted to 80%. The DAC curve of the first set of flat-bottomed holes is completed and used for quantitative analysis and judgment of defects at various depths within 10mm on the outer arc surface. On the outer arc surface, the second set of flat-bottomed holes A2, B2, C2, D2, E2, F2, G2, and H2 (20mm in diameter) are used. The flaw detector is set to DAC mode, and the reflected wave height of the eight flat-bottomed holes A2, B2, C2, D2, E2, F2, G2, and H2 is adjusted to 80%. This completes the DAC curve production of the first set of flat-bottomed holes, which is used for quantitative analysis and judgment of defects at various depths within 10mm to 20mm on the outer arc surface. On the outer arc surface, the third group of flat-bottomed holes A3, B3, C3, D3, E3, F3, G3, and H3 (30mm in diameter) are used. The flaw detector is set to DAC mode, and the reflected wave height of the eight flat-bottomed holes A3, B3, C3, D3, E3, F3, G3, and H3 is adjusted to 80%. The DAC curve of the first group of flat-bottomed holes is completed and used for quantitative determination and judgment of defects at various flaw detection depths within 20mm to 30mm on the outer arc surface. The fourth set of flat-bottomed holes A4, B4, C4, D4, E4, F4, G4, and H4, with a diameter of 40mm on the outer arc surface, are used. The flaw detector is set to DAC mode, and the reflected wave height of the eight flat-bottomed holes A4, B4, C4, D4, E4, F4, G4, and H4 is adjusted to 80% to complete the DAC curve of the fourth set of flat-bottomed holes. This curve is used for quantitative analysis and judgment of defects at various depths within 30mm to 60mm on the outer arc surface.

[0028] In this embodiment, flat-bottomed holes 4A1, A2, A3, and A4 with a sound path distance of 50 mm are used for the creation of DGS reference curves for dual-crystal straight probe flaw detection and quantitative determination of defects, corresponding to curve numbers A1DGS, A2DGS, A3DGS, and A4DGS, respectively. Normal flaw detection inspection uses the A3DGS reference curve.

[0029] In this embodiment, when abnormal reflections occur during flaw detection and need to be recorded or determined: When the abnormal reflection is within 10mm of the outer arc surface, select A1DGS for quantitative determination. When the abnormal reflection is within 20mm of the outer arc surface, select A2DGS for quantitative determination. When the abnormal reflection is within 30mm of the outer arc surface, select A3DGS for quantitative determination. When the abnormal reflection is more than 30mm away from the outer arc surface, select A4DGS for quantitative determination; The A1 flat-bottom hole 4, A2 flat-bottom hole 4, A3 flat-bottom hole 4, and A4 flat-bottom hole 4 are used together for near-field detection of end faces and quantitative determination of defects.

[0030] In this embodiment, the height of the test block body 1 with a sound path distance of 200mm is 220mm, which is used for the zero-position sound velocity calibration and vertical linearity test of the ultrasonic flaw detection system; the height of the test block body 1 with a sound path distance of 50mm is 70mm, which is used for the horizontal linearity test of the ultrasonic flaw detection system. The primary bottom wave of the test block body 1 with a height of 220mm is adjusted to 45% of the scale on the flaw detector display screen, and the secondary bottom wave is adjusted to 90% of the scale on the flaw detector display screen, which is used for the zero-position and sound velocity calibration of the flaw detector before flaw detection.

[0031] In this embodiment, the fourth set of flat-bottomed holes 4 is based on the DAC curve, and a signal-to-noise ratio evaluation curve is generated by -6dB. This curve is used for ultrasonic signal-to-noise ratio evaluation of the open end face of the planetary gear. When the basic noise signal is lower than the signal-to-noise ratio evaluation curve during planetary gear flaw detection, the flaw detection depth is detectable.

[0032] In this embodiment, the inner and outer rim surfaces and the upper and lower end surfaces of the test block body 1 are parallel to each other, and the roughness of all surfaces is less than Ra3.2. This comparative test block can be used as a standard body for the calibration of the ultrasonic flaw detection system for wind turbine gears and the evaluation of the overall system performance.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention includes the claims being limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0034] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear, comprising a test block body (1), characterized in that, The test block body (1) is made of the same material as the wind turbine planetary gear being tested. The outline of the test block body (1) is modeled after the local tooth profile of the wind turbine planetary gear. It includes a concave curved surface (2) for simulating the tooth root region and a convex curved surface (3) for simulating the tooth tip region. The test block body (1) is provided with a flat-bottomed hole group for making DGS curves and sensitivity calibration.

2. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 1, characterized in that, The test block body (1) is made of 18CrNiMo gear steel, and the forging process and heat treatment process of the test block body (1) are the same as those of the wind power planetary gear being tested. The grain size of the test block body (1) is uniform and the grain size grade is higher than that of the planetary gear average grain size.

3. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 1, characterized in that, The flat-bottomed hole group consists of eight groups of flat-bottomed holes (4) arranged in the sound path direction with a group spacing of 50 mm from 50 mm to 400 mm. In the parallel direction of the ultrasonic beam, four more groups are arranged with a group spacing of 10 mm from 10 mm to 40 mm, based on the outer arc surface, forming 32 flat-bottomed holes (4). The size of the flat-bottomed hole (4) is φ0.6 mm and the depth is 20 mm.

4. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 3, characterized in that, The 32 flat-bottomed holes (4) include: The first set of flat-bottomed holes (4) 10mm from the outer arc surface: A1, B1, C1, D1, E1, F1, G1, H1; The second set of flat-bottomed holes (4) 20mm from the outer arc surface: A2, B2, C2, D2, E2, F2, G2, H2; The third set of flat-bottomed holes (4) 30mm from the outer arc surface: A3, B3, C3, D3, E3, F3, G3, H3; The fourth set of flat-bottomed holes (4) 40mm from the outer arc surface: A4, B4, C4, D4, E4, F4, G4, H4; Among them, AH correspond to sound path distances of 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, and 400mm, respectively.

5. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 4, characterized in that, The first set of flat-bottomed holes (4) A1, B1, C1, D1, E1, F1, G1, H1 are used for DAC curve fabrication and defect quantitative judgment in the area 10mm away from the outer arc surface; The second set of flat-bottomed holes (4) A2, B2, C2, D2, E2, F2, G2, H2 are used for DAC curve fabrication and defect quantitative judgment in the area 10mm to 20mm away from the outer arc surface; The third set of flat-bottomed holes (4) A3, B3, C3, D3, E3, F3, G3, H3 are used for DAC curve fabrication and defect quantitative judgment in the area 20mm to 30mm away from the outer arc surface; The fourth set of flat-bottomed holes (4) A4, B4, C4, D4, E4, F4, G4, H4 are used for DAC curve production and defect quantitative judgment in the area 30mm to 40mm away from the outer arc surface.

6. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 4, characterized in that, The flat-bottomed holes (4) with a sound path distance of 50mm are used for the production of DGS reference curves and the quantitative judgment of defects by dual crystal straight probes. They correspond to curve numbers A1DGS, A2DGS, A3DGS, and A4DGS, respectively. Normal flaw detection inspection uses the A3DGS reference curve.

7. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 6, characterized in that, When abnormal reflections are observed during flaw detection and need to be recorded or determined: When the abnormal reflection is within 10mm of the outer arc surface, select A1DGS for quantitative determination. When the abnormal reflection is within 20mm of the outer arc surface, select A2DGS for quantitative determination. When the abnormal reflection is within 30mm of the outer arc surface, select A3DGS for quantitative determination. When the abnormal reflection is more than 30mm away from the outer arc surface, select A4DGS for quantitative determination; The flat-bottomed holes A1 (4), A2 (4), A3 (4), and A4 (4) are used together for near-field detection of end faces and quantitative determination of defects.

8. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 1, characterized in that, The test block body (1) with a sound path distance of 200mm has a height of 220mm and is used for zero-position sound velocity calibration and vertical linearity testing of the ultrasonic flaw detection system; the test block body (1) with a sound path distance of 50mm has a height of 70mm and is used for horizontal linearity testing of the ultrasonic flaw detection system.

9. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 5, characterized in that, The fourth set of flat-bottomed holes (4) is used to generate a signal-to-noise ratio evaluation curve by -6dB based on the DAC curve, which is used for ultrasonic signal-to-noise ratio evaluation of the open end face of the planetary gear.

10. The ultrasonic comparison test block for the open tooth face end of a wind turbine planetary gear according to claim 1, characterized in that, The inner and outer rim surfaces and the upper and lower end surfaces of the test block body (1) are parallel to each other, and the roughness of all surfaces is less than Ra3.2.

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