Turbine blade detection auxiliary tool

Abstract

The utility model provides a turbine blade detection auxiliary tool comprising the following structures: a positioning plate used for fitting with a suction surface or a pressure surface of a turbine blade and provided with a plurality of detection holes; the positioning piece is arranged on the positioning plate and used for being attached to the front edge of the turbine blade; the positioning step block is arranged at the bottom of the positioning plate and used for avoiding a rounding area arranged between a blade body of the turbine blade and a margin plate, the positioning step block is in a step shape, and a scribing curved edge used for making contact with a margin plate runner face of the margin plate is arranged at the bottom of the positioning step block. The utility model has the beneficial effects that the accuracy of the blade position in the detection process can be ensured, the reasonable distribution and accurate marking of the detection holes provide reliable reference points for the wall thickness detection, the rounding area and the margin plate runner surface area are distinguished through the scribing curved edge and detection analysis is carried out, and the detection efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the field of gas turbines, and specifically to an auxiliary tool for detecting turbine blades. Background Art

[0002] During the service process of a gas turbine, due to the long-term exposure of its turbine blades to high temperature, high pressure and the impact of high-speed air flow, various defects may appear on the surface, such as cracks, wear, corrosion, etc. The existence of these defects will seriously affect the performance of the blades and the safe operation of the gas turbine. Therefore, it is crucial to conduct regular defect detection and timely repair of the blades.

[0003] Currently, before using ultrasonic waves to detect the wall thickness of blades, a wall thickness detection tooling is mostly used. The wall thickness detection tooling can assist in marking detection points on the blades, thereby improving the efficiency of wall thickness detection. Most of the existing blade wall thickness detection toolings can only perform a single positioning and point marking operation, with relatively single functions. And for the few detection toolings that can simultaneously assist in measuring the blade profile and wall thickness, although they have more comprehensive functions, their structures are complex, and frequent tooling replacement is required during actual operation, which not only reduces the work efficiency but also increases the detection cost.

[0004] In addition, for the defect detection and repair of turbine blades, corresponding judgment criteria and repair plans need to be formulated according to different regions of the blades. In the fillet region of the blade, that is, the transition region where the blade is connected to the disk, due to stress concentration, defects are more likely to occur. Therefore, the repair plan for this region is relatively more stringent. And for the blade vane flow passage surface, that is, the air flow passage surface of the blade, although it also bears the impact of air flow, due to its structural characteristics, the repair plan is relatively looser. The existing detection toolings cannot distinguish the fillet region and the vane flow passage surface of the blade, reducing the repair efficiency. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide an auxiliary tool for detecting turbine blades and a using method.

[0006] The technical solution adopted by the utility model is as follows:

[0007] An auxiliary tool for detecting turbine blades, comprising: a positioning plate for fitting with the suction surface or pressure surface of the turbine blade, on which a plurality of detection holes are provided; a positioning member arranged on the positioning plate for fitting with the leading edge of the turbine blade; a positioning stepped block arranged at the bottom of the positioning plate for avoiding the fillet region provided between the blade body and the vane of the turbine blade, the positioning stepped block being in a stepped shape and having a scribing curved edge at the bottom for contacting the vane flow passage surface of the vane.

[0008] Further, the turbine blade detection auxiliary tooling includes a turbine blade pressure surface detection auxiliary tooling and a turbine blade suction surface detection auxiliary tooling.

[0009] Further, the detection hole includes a conical hole and a cylindrical through-hole that communicate with each other.

[0010] Further, the number of the positioning members is two, including a first positioning member for fitting with the upper end of the leading edge and a second positioning member for fitting with the lower end of the leading edge.

[0011] Further, the turbine blade detection auxiliary tooling is an integrally formed part.

[0012] Further, the turbine blade detection auxiliary tooling is formed at one time by a 3D printer.

[0013] Compared with the prior art, the present utility model has the following advantages:

[0014] 1. The scribed curved edge at the bottom of the positioning step block has both positioning and scribing functions, and can quickly distinguish the rounded area and the vane platform flow path surface of the turbine blade. During the repair stage of the turbine blade, corresponding defect repair plans can be effectively formulated according to different regions, improving the defect detection and repair efficiency.

[0015] 2. Since the stability of the turbine blade during the detection process is guaranteed, the number of repeated detections can be reduced, thereby improving the efficiency of the detection work. At the same time, the cavity part between the first positioning member and the second positioning member of the turbine blade detection auxiliary tooling provides a holding space for the operator, and precise positioning can be achieved through single-handed operation, which is simple and practical, effectively reducing the workload and working time.

[0016] 3. The design of the turbine blade detection auxiliary tooling can be adjusted according to different types of turbine blades, has good adaptability, and can be used for the detection of multiple blades. At the same time, the present utility model is a dual-purpose auxiliary tooling, with both wall thickness detection and defect detection auxiliary functions, reducing the tooling manufacturing cost.

[0017] 4. By regularly using the turbine blade detection auxiliary tooling for precise detection, potential problems of the turbine blade can be discovered in time, and corresponding maintenance measures can be taken, thereby extending the service life of the turbine blade. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the pressure surface of the turbine blade;

[0019] Figure 2 It is a schematic diagram of the suction surface of the turbine blade;

[0020] Figure 3 It is a schematic structural diagram of the turbine blade pressure surface detection auxiliary tooling of the present utility model;

[0021] Figure 4 Schematic diagram of the assembly structure of the pressure surface detection auxiliary tooling for the turbine blade of the present utility model and the pressure surface of the turbine blade;

[0022] Figure 5 Schematic diagram of the structure of the suction surface detection auxiliary tooling for the turbine blade of the present utility model;

[0023] Figure 6 Schematic diagram of the assembly structure of the suction surface detection auxiliary tooling for the turbine blade of the present utility model and the suction surface of the turbine blade.

[0024] Description of component labels:

[0025] 1 Pressure surface detection auxiliary tooling for turbine blade

[0026] 11 Pressure surface positioning plate

[0027] 111 Pressure surface detection hole

[0028] 121 First pressure surface positioning part

[0029] 122 Second pressure surface positioning part

[0030] 13 Pressure surface positioning step block

[0031] 131 Pressure surface scribing curved edge

[0032] 2 Suction surface detection auxiliary tooling for turbine blade

[0033] 21 Suction surface positioning plate

[0034] 211 Suction surface detection hole

[0035] 221 First suction surface positioning part

[0036] 222 Second suction surface positioning part

[0037] 23 Suction surface positioning step block

[0038] 231 Suction surface scribing curved edge

[0039] 3 Pressure surface

[0040] 31 Pressure surface fillet area

[0041] 4 Suction surface

[0042] 41 Suction surface fillet area

[0043] 5 Leading edge

[0044] 6 Rim plate

[0045] 61 Rim plate flow channel surface Detailed implementation manners

[0046] The following further elaborates in detail on the detailed implementation manners of the present utility model in conjunction with the accompanying drawings. These implementation manners are only used to illustrate the present utility model and are not intended to limit the present utility model.

[0047] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0048] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0050] Figure 1 Shown is a schematic diagram of the pressure surface of a turbine blade. In the following description, the accompanying drawings in Figure 1 are used as the reference basis for directions. In Figure 1 , perpendicular to the drawing paper and facing outwards is the front direction, perpendicular to the drawing paper and facing inwards is the rear direction, upwards along the drawing paper is the upper direction, downwards along the drawing paper is the lower direction, rightwards along the drawing paper is the right direction, and leftwards along the drawing paper is the left direction.

[0051] As Figure 1 and Figure 2 shown, the structure of the turbine blade is prior art, which includes a blade body and a shroud 6 connected to each other. The blade body includes a pressure surface 3, a suction surface 4, and a leading edge 5; the surface of the shroud 6 close to the blade body is the shroud flow passage surface 61. There is also a fillet region provided between the root of the blade body and the shroud flow passage surface 61. The fillet region includes a pressure surface fillet region 31 connected to the pressure surface 3 and a suction surface fillet region 41 connected to the suction surface 4.

[0052] Embodiment 1

[0053] AsFigure 3 and Figure 4 As shown in Figure 3 and Figure 4 , the turbine blade pressure surface detection auxiliary tooling in the first embodiment is the turbine blade pressure surface detection auxiliary tooling 1. This auxiliary tooling includes: a pressure surface positioning plate 11, a pressure surface positioning member provided on the pressure surface positioning plate 11, and a pressure surface positioning stepped block 13 provided at the bottom of the pressure surface positioning plate 11. The shape of the pressure surface positioning plate 11 is consistent with the shape of the pressure surface 3, and it can be completely fitted with the pressure surface 3, thereby ensuring the stability and accuracy of the turbine blade during the detection process. There are a plurality of pressure surface detection holes 111 on the pressure surface positioning plate 11; the pressure surface positioning member is provided on the left side of the pressure surface positioning plate 11, and it is used to fit with the leading edge 5 to ensure that the turbine blade is in the correct position during the detection process and prevent it from moving to the right during the detection process; the pressure surface positioning stepped block 13 is used to avoid the pressure surface fillet area 31. The pressure surface positioning stepped block 13 is in a stepped shape, and its bottom is provided with a pressure surface scribing curved edge 131 for contacting the flange runner surface 61. The protruding direction of the pressure surface positioning stepped block 13 is opposite to that of the pressure surface positioning plate 11. This design allows the turbine blade pressure surface detection auxiliary tooling 1 to contact the flange runner surface 61, and at the same time, it can avoid damage to the pressure surface fillet area 31 caused by the pressure surface positioning stepped block 13.

[0054] Specifically, the pressure surface detection hole 111 includes a conical hole and a cylindrical through hole that are communicated with each other. This structure is convenient for a marker pen to extend into during point tracing, helps to reduce the problem of pen shaking caused by irregular channels, and ensures that the detection points marked through the pressure surface detection hole 111 are clear and accurate.

[0055] Specifically, the number of the pressure surface positioning members is two, including a pressure surface first positioning member 121 for fitting with the upper end of the leading edge 5 and a pressure surface second positioning member 122 for fitting with the lower end of the leading edge 5. These two positioning members not only ensure that the turbine blade pressure surface detection auxiliary tooling 1 is in a stable position, but also the cavity part between them provides a holding space for the operator, facilitating the operator to operate with one hand.

[0056] Specifically, the turbine blade pressure surface detection auxiliary tooling 1 is an integrally formed part, which helps to keep the accuracy of each part consistent during the processing. Preferably, the turbine blade pressure surface detection auxiliary tooling 1 is formed by 3D printing.

[0057] In the first embodiment, a method for using a turbine blade pressure surface detection auxiliary tooling 1:

[0058] When it is necessary to detect the wall thickness of the turbine blade, the following steps are included:

[0059] S1. Complete the positioning and installation of the auxiliary tooling 1 for the pressure surface detection of the turbine blade, so that the pressure surface positioning plate 11 fits completely on the pressure surface 3 of the turbine blade to be measured, the pressure surface positioning part fits completely on the leading edge 5 of the turbine blade to be measured, and the pressure surface scribing curved edge 131 fits completely on the rib channel surface 61;

[0060] S12. Mark each pressure surface detection hole 111 with a pen;

[0061] S13. Remove the auxiliary tooling 1 for the pressure surface detection of the turbine blade, and perform wall thickness detection on each detection point marked on the pressure surface 3 one by one. Preferably, use the ultrasonic thickness measurement method for wall thickness detection. Move the ultrasonic probe to the marked detection point. When the ultrasonic pulse emitted by the probe passes through the turbine blade to be measured and reaches the material interface, the ultrasonic pulse is reflected back to the probe. Determine the thickness of the measured material by accurately measuring the time for the ultrasonic wave to propagate in the material, so as to perform wall thickness detection.

[0062] When it is necessary to detect the surface defects of the turbine blade, the following steps are included:

[0063] S2. Complete the positioning and installation of the auxiliary tooling 1 for the pressure surface detection of the turbine blade, so that the pressure surface positioning plate 11 fits completely on the pressure surface 3 of the turbine blade to be measured, the pressure surface positioning part fits completely on the leading edge 5 of the turbine blade to be measured, and the pressure surface scribing curved edge 131 fits completely on the rib channel surface 61;

[0064] S21. Use a pen to scribe along the pressure surface scribing curved edge 131 to distinguish the pressure surface fillet area 31 and the rib channel surface 61;

[0065] S22. Remove the auxiliary tooling 1 for the pressure surface detection of the turbine blade, analyze the defects of the pressure surface fillet area 31 and the rib channel surface 61 respectively, and formulate corresponding defect repair plans.

[0066] Specifically, in the above step S21, the gap size between the pressure surface scribing curved edge 131 and the edge of the pressure surface fillet area 31 is set according to the area division requirements during defect detection. Preferably, the gap between the pressure surface scribing curved edge 131 and the edge of the pressure surface fillet area 31 is 2 - 3 mm.

[0067] Embodiment 2

[0068] Such as Figure 5 And Figure 6As shown in the figure, the turbine blade suction surface detection auxiliary tooling in the second embodiment is the turbine blade suction surface detection auxiliary tooling 2, which includes: a suction surface positioning plate 21, a suction surface positioning member arranged on the suction surface positioning plate 21, and a suction surface positioning step block 23 arranged at the bottom of the suction surface positioning plate 21. The shape of the suction surface positioning plate 21 is the same as that of the suction surface 4, and it can be completely attached to the suction surface 4, so as to ensure the stability and accuracy of the turbine blade during the detection process. There are a plurality of suction surface detection holes 211 on the suction surface positioning plate 21; the suction surface positioning member is arranged on the left side of the suction surface positioning plate 21, and it is used to fit with the leading edge 5 to ensure that the turbine blade is in the correct position during the detection process and prevent it from moving to the right during the detection process; the suction surface positioning step block 23 is used to avoid the suction surface fillet area 41. The suction surface positioning step block 23 is in a stepped shape, and its bottom is provided with a suction surface scribing curved edge 231 for contacting the flange runner surface 61. The suction surface positioning step block 23 and the suction surface positioning plate 21 protrude in the same direction. This design allows the turbine blade suction surface detection auxiliary tooling 2 to contact the flange runner surface 61, and at the same time, it can avoid damage to the suction surface fillet area 41 caused by the suction surface positioning step block 23.

[0069] Specifically, the suction surface detection hole 211 includes a conical hole and a cylindrical through hole that are connected to each other. This structure is convenient for a marking pen to extend into during point marking, helps to reduce the problem of pen shaking caused by irregular channels, and ensures that the detection points marked through the suction surface detection hole 211 are clear and accurate.

[0070] Specifically, the number of suction surface positioning members is two, including a suction surface first positioning member 221 for fitting with the upper end of the leading edge 5 and a suction surface second positioning member 222 for fitting with the lower end of the leading edge 5. These two positioning members not only ensure that the turbine blade suction surface detection auxiliary tooling 2 is in a stable position, but also the cavity part between the two provides a holding space for the operator, which is convenient for the operator to operate with one hand.

[0071] Specifically, the turbine blade suction surface detection auxiliary tooling 2 is an integrally formed part, which helps to keep the accuracy of each part consistent during the processing. Preferably, the turbine blade suction surface detection auxiliary tooling 2 is formed by 3D printing.

[0072] In the second embodiment, a method for using a turbine blade suction surface detection auxiliary tooling 2:

[0073] When it is necessary to detect the wall thickness of the turbine blade, the following steps are included:

[0074] S1. Complete the positioning and installation of the auxiliary tooling 2 for detecting the suction surface of the turbine blade, so that the suction surface positioning plate 21 fits perfectly on the suction surface 4 of the turbine blade to be measured, the suction surface positioning part fits perfectly on the leading edge 5 of the turbine blade to be measured, and the suction surface scribing curved edge 231 fits perfectly on the rib channel surface 61;

[0075] S12. Mark each suction surface detection hole 211 with a pen;

[0076] S13. Remove the auxiliary tooling 2 for detecting the suction surface of the turbine blade, and perform wall thickness detection on each detection point marked on the suction surface 4 one by one. Preferably, use the ultrasonic thickness measurement method to perform wall thickness detection. Move the ultrasonic probe to the marked detection point. When the ultrasonic pulse emitted by the probe passes through the turbine blade to be measured and reaches the material interface, the ultrasonic pulse is reflected back to the probe. Determine the thickness of the measured material by accurately measuring the time for the ultrasonic wave to propagate in the material, so as to perform wall thickness detection;

[0077] When detecting the surface defects of the turbine blade, the following steps are included:

[0078] S2. Complete the positioning and installation of the auxiliary tooling 2 for detecting the suction surface of the turbine blade, so that the suction surface positioning plate 21 fits perfectly on the suction surface 4 of the turbine blade to be measured, the suction surface positioning part fits perfectly on the leading edge 5 of the turbine blade to be measured, and the suction surface scribing curved edge 231 fits perfectly on the rib channel surface 61;

[0079] S21. Use a pen to scribe along the suction surface scribing curved edge 231 to distinguish the suction surface fillet area 41 and the rib channel surface 61;

[0080] S22. Remove the auxiliary tooling 2 for detecting the suction surface of the turbine blade, analyze the defects of the suction surface fillet area 41 and the rib channel surface 61 respectively, and formulate corresponding defect repair plans.

[0081] Specifically, in the above step S21, the gap size between the suction surface scribing curved edge 231 and the edge of the suction surface fillet area 41 is set according to the requirements of area division during defect detection. Preferably, the gap between the suction surface scribing curved edge 231 and the edge of the suction surface fillet area 41 is 2 - 3 mm.

[0082] Those skilled in the art can also choose other wall thickness detection methods to replace the above ultrasonic thickness measurement method according to needs, such as the eddy current thickness measurement method, etc.

[0083] The turbine blade detection auxiliary tooling of the present utility model includes a positioning plate, a positioning member, and a positioning step block. These components can be closely attached to the pressure surface 3 or suction surface 4, leading edge 5, and rib passage surface 61 of the turbine blade respectively, preventing displacement of the turbine blade detection auxiliary tooling in the left-right direction, front-back direction, and up-down direction, thereby ensuring stability and accuracy during the detection process. Through the design of the detection holes, it is convenient to mark the turbine blade and complete the wall thickness measurement of the turbine blade. The scribed curved edge is used to distinguish the rounded area and the rib passage surface 61, facilitating the analysis and repair of surface defects of the blade, and providing strong support for subsequent maintenance and performance evaluation of the turbine blade.

[0084] In summary, the present utility model can ensure the accuracy of the position of the turbine blade during the detection process, reducing detection deviations caused by human factors or equipment errors. At the same time, the reasonable distribution and precise marking of the detection holes also provide reliable reference points for wall thickness detection, further improving the detection accuracy. The present utility model makes the detection process more standardized and procedural, reducing the operation difficulty and time cost of the detection personnel. Through the scribed curved edge, the detection personnel can quickly and accurately divide the detection area and conduct analysis, further improving the detection efficiency.

[0085] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present utility model, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. An auxiliary tooling for turbine blade detection, characterized in that Comprising: A positioning plate for fitting with the suction surface or pressure surface of the turbine blade, and a plurality of detection holes are provided thereon; A positioning member provided on the positioning plate for fitting with the leading edge of the turbine blade; A positioning step block provided at the bottom of the positioning plate for avoiding the fillet area provided between the blade body and the flange of the turbine blade, the positioning step block is in a stepped shape, and a scribing curved edge for contacting the flange flow path surface of the flange is provided at its bottom.

2. The auxiliary tooling for turbine blade detection according to claim 1, characterized in that: The detection hole includes a conical hole and a cylindrical through hole that communicate with each other.

3. The turbine blade detection auxiliary tooling according to claim 1, characterized in that: The number of the positioning members is two, including a first positioning member for fitting with the upper end of the leading edge and a second positioning member for fitting with the lower end of the leading edge.

4. The turbine blade detection auxiliary tooling according to claim 1, characterized in that: The turbine blade detection auxiliary tooling is an integrally formed part.

5. The turbine blade detection auxiliary tooling according to claim 4, characterized in that: The turbine blade detection auxiliary tooling is integrally formed by a 3D printer.

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