Clamp and method for turbine blade

Abstract

The invention relates to a clamp and a method for a turbine blade, the clamp comprising a fixture, wherein a blade root of the turbine blade is fixed on the fixture, a cover device for being detachably mounted on the turbine blade in a mounting position to cover a predetermined area on the turbine blade, wherein the cover device is embedded in the predetermined area in a form-fitting manner, and a connection device connected between the cover device and the fixture and holding the cover device in the mounting position.

Description

Technical Field

[0001] This invention relates to a clamp and method for turbine blades. Background Technology

[0002] In high-temperature spraying processes, precise masking of specific functional areas on the surface of components is a core challenge in ensuring controllable coating distribution. Especially when the spraying material is a high-melting-point coating, the preheating temperature exceeds 500°C, and the coating deposition thickness is greater than 200μm, traditional masking methods such as high-temperature resistant tape, ceramic fiber patches, or temporary coating materials are prone to shrinkage, warping, peeling, or carbonization under high-temperature environments due to mismatched coefficients of thermal expansion, insufficient mechanical strength, or poor adhesion reliability. This leads to masking failure, resulting in unintended coverage of non-target areas, affecting subsequent performance or increasing post-processing costs.

[0003] Furthermore, existing masking methods generally lack the ability to actively control the airflow dynamics of the spraying process, making it difficult to effectively block the lateral diffusion and rebound deposition of paint particles at complex curved surface interfaces. Especially in areas near edges or step transitions, sprayed particles are prone to bypassing the masking boundary due to flow field disturbances, forming "edge accumulation" or "micro-overspray." Moreover, this type of contamination is almost impossible to safely remove mechanically or chemically due to the dense and firmly adhered coating. Therefore, a masking system capable of stable isolation, active shielding, and high repeatability in high-temperature, high-kinetic-energy spraying environments is needed to overcome the technical bottlenecks of current processes, such as ambiguous boundary control, low yield, and poor repeatability. Summary of the Invention

[0004] In view of this, in order to solve the technical problem of high-temperature coating masking of components, this invention proposes a novel clamp for turbine blades. The turbine blade clamp proposed by this invention is easy to fix and disassemble, has high repeatability and high fixing accuracy, and can provide a high-temperature coating masking effect for components.

[0005] According to a preferred embodiment of the present invention, a clamp for a turbine blade is provided, the clamp comprising: a fixing device, wherein the blade root of the turbine blade is fixed to the fixing device; a covering device for detachably mounting on the turbine blade at a mounting position to cover a predetermined area on the turbine blade, wherein the covering device is fitted into the predetermined area in a form-fit manner; and a connecting device connecting the covering device and the fixing device and holding the covering device in the mounting position. By setting the form-fitting covering device, a high-precision geometric match is achieved between the shielding area and the turbine blade surface, avoiding coating penetration caused by poor adhesion of traditional tapes or soft shielding materials; at the same time, the mechanical association between the covering device and the fixing device is established by the connecting device, forming a stable and repeatable positioning system, so that the covering device remains in position under the conditions of high spraying temperature, airflow impact and thermal expansion, improving the accuracy of the shielding boundary and achieving a pollution-free and highly repeatable shielding process.

[0006] According to an exemplary embodiment of the present invention, the connecting device includes: a first connector connected to a fixing device, wherein the first connector extends away from the turbine blades below the maximum height of the fixing device; a second connector connected to the first connector and spaced apart from the turbine blades and the fixing device, extending from the first connector toward a covering device in a direction parallel to the edge of the turbine blades; and a third connector extending from an end of the second connector above the covering device and spaced apart from the covering device, wherein a fastener is provided at the end of the third connector away from the second connector, the fastener extending downward and connecting to the covering device. This multi-segment connecting device is configured as a spatially isolated force transmission structure, achieving precise clamping without applying lateral forces. This design avoids the connecting device itself becoming a source of spray contamination and achieves non-contact, low thermal conductivity, and highly stable masking fixation.

[0007] According to an exemplary embodiment of the present invention, the third connector includes: a first portion connected to the second connector; and a second portion extending from the first portion, wherein the extension direction of the second portion forms a first angle with the extension direction of the first portion, and is connected to the covering device via a fastener, and is configured to partially cover the covering device, wherein the second portion has a profile consistent with the covered portion of the covering device. The second portion extends at a specific angle and matches the profile of the covering device, which not only enhances structural rigidity but also ensures that the covering device is automatically centered during installation without manual alignment; simultaneously, its profile matches the shielding area, allowing the fastening force to be evenly distributed on the surface of the covering device, preventing local crushing or warping, and significantly improving shielding consistency and assembly efficiency.

[0008] According to an exemplary embodiment of the present invention, the second connector includes: a first segment connected to the first connector; a second segment connected to the first segment, wherein the extending direction of the first segment and the extending direction of the second segment form a second angle; and a third segment connected between the second segment and the third connector, wherein the extending direction of the third segment and the extending direction of the second segment form a third angle, wherein the first segment, the second segment, and the third segment are in the same plane. This multi-segment polygonal structure allows the second connector to achieve spatial path routing within a single plane, avoiding the heat-affected zone of the turbine blades and the spraying path, while maintaining the overall rigidity of the connecting device; the angle design allows the connecting device to adapt to fixing devices of different heights and covering devices of different positions, improving the versatility and adaptability of the clamp to complex geometric components.

[0009] According to an exemplary embodiment of the present invention, the extending direction of the first connector forms a fourth angle with the surface of the fixing device used to connect the first connector, wherein the extending direction of the first connector is parallel to the extending direction of the first portion of the third connector and parallel to the plane where the second connector is located. This angle design allows the first connector to be connected to the fixing device in a non-perpendicular direction, avoiding obstruction of the spraying path of the turbine blades; at the same time, its parallelism with the third connector and coplanarity with the second connector form a stable planar mechanical closed-loop structure, enhancing the overall vibration resistance and thermal deformation resistance, simplifying the manufacturing of the connecting device and making the installation of the connecting device easier.

[0010] According to an exemplary embodiment of the present invention, the fixing device only partially covers the turbine blades. The fixing device only contacts the turbine blades in non-critical areas, minimizing the contact area between the fixture and the workpiece, and avoiding coating blind spots or uneven heat conduction caused by the fixing device itself.

[0011] According to an exemplary embodiment of the present invention, the clamp further includes a connecting block disposed on the fixing device, the connecting block being located below the maximum height of the fixing device, wherein the connecting device is fixed to the fixing device by inserting the lower end of the first connector into the connecting block. This enables quick plug-and-play installation of the connecting device without repeated tightening or welding, shortening the clamp replacement and adjustment time.

[0012] According to an exemplary embodiment of the present invention, the connecting block includes a fixing groove, the shape of which matches the insertion end of the first connector inserted into the connecting block. The groove structure with matching shape enables precise positioning of the first connector without gaps or offset, ensuring excellent repeatability of the connecting device's installation position each time. The groove structure also provides lateral constraint force to prevent the connecting device from rotating or displacing during spraying vibrations, further improving the stability of the masking boundary and the process tolerance.

[0013] According to an exemplary embodiment of the present invention, the connecting device exerts pressure on the covering device due to gravity to hold the covering device in the installed position. The overall center of gravity of the connecting device can be located behind or below the covering device, which allows the connecting device to generate a downward gravitational component due to its own mass in the assembled state. This gravitational component can be transmitted through its contact with the covering device, thereby forming an auxiliary downward pressing effect and improving the contact stability of the shielding structure in high temperature and high vibration environments.

[0014] According to an exemplary embodiment of the present invention, the coverage area of ​​the covering device is smaller than the area of ​​the predetermined region. By designing the size of the covering device to be slightly smaller than the area to be shielded, a micro-gap, for example 0.2–0.5 mm, is formed between them. This gap can serve as a buffer for coating deposition, preventing the edge of the covering device from being directly squeezed against the turbine blade surface due to thermal expansion, and preventing local stress from causing deformation or coating from being squeezed into the gap.

[0015] According to an exemplary embodiment of the present invention, the clamp is configured to rotate about an axis passing through the turbine blade and extending in the height direction of the fixing device. The shielding clamp can rotate with the turbine blade, ensuring that the covering device remains relatively stationary with respect to the predetermined area, thus preventing shielding displacement or gap changes due to turbine blade rotation.

[0016] According to another preferred embodiment of the present invention, a method for securing a turbine blade to a clamp is provided, the method comprising: securing the turbine blade to a fixing device; detachably mounting a covering device on a mounting position on the turbine blade to cover a predetermined area of ​​the turbine blade, wherein the covering device is fitted into the predetermined area in a form-fitting manner; and connecting a connecting device between the covering device and the fixing device such that the covering device is held in the mounting position by the connecting device. Attached Figure Description

[0017] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which will make the above and other features and advantages of the present invention more apparent to those skilled in the art. In the drawings: Figure 1 A schematic diagram of the fixture according to an embodiment of the present invention is shown.

[0018] Figure 2 A schematic diagram of the structure of a clamp covering device according to an embodiment of the present invention is shown.

[0019] Figure 3 A schematic diagram of the connection device of the clamp according to an embodiment of the present invention is shown.

[0020] Figure 4 A side view of the second connector of the clamping device according to an embodiment of the present invention is shown.

[0021] Figure 5 A schematic diagram of the structure of the first connector of the clamping device according to an embodiment of the present invention is shown.

[0022] Figure 6 A schematic diagram of the structure of the third connector of the clamping device according to an embodiment of the present invention is shown. Detailed Implementation

[0023] To enable those skilled in the art to better understand the solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely embodiments of a connector of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other solutions obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a product or device that comprises a series of units is not necessarily limited to those units explicitly listed, but may include other units not listed or inherent to such product or device.

[0025] Figure 1 A schematic diagram of the structure of a clamp according to an embodiment of the present invention is shown. Figure 1 In this embodiment, the fixture includes a fixing device 1, a covering device 2, and a connecting device 3. These three components work together to achieve high-precision, pollution-free, and repeatable masking of the turbine blade 4 during the high-temperature spraying process. In this embodiment, all sheet metal is made of 3-5 mm thick metal, such as nickel-based materials and high-temperature resistant stainless steel. The fixing device 1 is used to fix the blade root of the turbine blade 4, stably positioning the turbine blade 4 on the spraying station. For example, the turbine blade 4 is fixed to the fixing device 1 by means of additional clamping components. In this embodiment, for the sake of brevity, ... Figure 1The turbine blade root and additional clamping elements are not shown, but three positioning holes for securing the blade root to the fixing device 1 are shown. In this embodiment, the fixing device 1 itself does not completely cover the turbine blade 4, but only provides support and positioning references in its non-critical functional areas (e.g., the platform bottom surface or non-aerodynamic surfaces). The covering device 2 is used to detachably mount on the turbine blade 4 at the mounting location to cover a predetermined area on the turbine blade 4. For example, the predetermined area is a specific geometric feature area where coating deposition is to be avoided. In this embodiment, the predetermined area is located at the end of the turbine blade 4, and its surface has a complex three-dimensional profile, such as including at least one arcuate groove, a stepped transition area, or a curved recessed structure. The covering device 2 is fitted into the predetermined area in a form-fitting manner. The surface of the covering device 2 facing the turbine blade end has a profile that matches the geometry of the turbine blade end, for example, if the turbine blade end has an arcuate groove, then the corresponding surface of the covering device 2 has an arcuate protrusion or an arcuate stepped profile to match the groove profile of the turbine blade end. The connecting device 3 is connected between the covering device 2 and the fixing device 1 and holds the covering device 2 in the installation position to prevent it from shifting under high temperature, airflow impact or vibration conditions during the spraying process. Figure 1 A platform 6 for positioning turbine blade 4 is also shown, which extends in a direction perpendicular to the extension plane of the fixing device 1 at the edge of the fixing device 1 that shields the turbine blade 4, and has a through hole through which the turbine blade 4 passes and which is consistent with the cross section of the turbine blade 4.

[0026] In a preferred embodiment, the connecting device 3 exerts pressure on the covering device 2 due to gravity, thereby holding the covering device 2 in the installation position. The fixing device 1 only partially covers the turbine blade 4. The clamp is configured to rotate about an axis that passes through the turbine blade 4 and extends in the height direction of the fixing device 1. After the first surface of the turbine blade 4 has been coated, the second surface of the turbine blade 4 is rotated and exposed to the spraying path of the spraying tool by means of the rotation of the clamp, thereby completing the coating of the second surface.

[0027] Figure 2 A schematic diagram of the structure of the covering device 2 of the clamp according to an embodiment of the present invention is shown. Figure 2The diagram shows the covering device 2 being secured to the connecting device 3 via fasteners 34. Since the turbine blade tip has a continuous arcuate groove, the corresponding surface of the covering device 2 according to this embodiment is provided with matching arcuate protrusions or segmented arcuate stepped structures. In a preferred embodiment, the coverage area of ​​the covering device 2 is smaller than the area of ​​a predetermined region on the turbine blade. When the covering device 2 is installed at the turbine blade tip, the edge of the covering device 2 covers a portion of the edge of the turbine blade tip groove, and the two form a micro-gap fit after assembly, for example, 0.2–0.5 mm. This avoids thermal stress deformation caused by direct contact and effectively guides the sprayed particle flow around the edge, preventing the coating from penetrating along the contour edge.

[0028] Figure 3 A schematic diagram of the connecting device 3 of the clamp according to an embodiment of the present invention is shown. Figure 3 In the illustrated embodiment, the connecting device 3 includes a first connector 31 connected to the fixing device 1, a second connector 32 connected to the first connector 31, and a third connector 33. These three components work together to form a mechanical connection system, facilitating precise shielding of the turbine blade tip, which serves as the turbine blade. In one embodiment, the first connector 31, the second connector 32, and the third connector 33 are assembled and welded together. One end of the first connector 31 is reliably connected to the fixing device 1, and its extension direction is strictly limited to below the maximum height of the fixing device 1, extending away from the turbine blade. This ensures that the first connector 31 is completely outside the hot zone of the spraying process and is not exposed to the preheating environment or the high-speed spray particle stream. The second connector 32 connects to the free end of the first connector 31. Its overall structure maintains a predetermined gap with the turbine blade and the fixing device 1, for example, 20-50 mm, forming a contactless safety channel. This ensures that during the spraying process, regardless of airflow disturbances or spray trajectory deviations, the second connector 32 will not interfere with or contact critical areas such as the aerodynamic profile, cooling holes, or platform edges of the turbine blade. The second connector 32 extends from the end of the first connector 31 along the outer edge contour of the turbine blade tip, ultimately guiding to the area directly above the covering device 2. Preferably, this path selection is based on the reverse contouring design of the turbine blade tip geometry (such as the trailing edge slope, platform transition area, and blade tip arc contour), achieving both physical blocking and path guidance of the sprayed particle flow. The third connector 33 extends from the end of the second connector 32 above the covering device 2 and is spaced apart from it. A fastener 34 is provided at the end of the third connector 33 furthest from the second connector 32, extending downwards to connect with the covering device 2.

[0029] In a preferred embodiment, the second connector 32 is a three-segment planar polygonal structure, including a first segment 321, a second segment 322, and a third segment 323, all located in the same plane, forming a precise and controllable mechanical transmission path. The first segment 321 is a vertical extension segment, extending along the height of the fixing device 1 or the height of the turbine blades after they are fixed, directly connecting to the first connector 31 and undertaking the initial load transmission function. The first segment 321 and... Figure 1 The corner spacing of the platform 6 used for positioning the turbine blade 4 is shown to be, for example, 30-50 mm. In this embodiment, during the spraying of the turbine blade, spraying is performed first in the vertical or longitudinal direction of the turbine blade, followed by spraying in the horizontal or lateral direction for the area of ​​the turbine blade near the highest edge of the fixing device 1 or the boundary position shielded by the fixing device 1. Furthermore, to avoid or minimize the coating being reflected onto the turbine blade or interfered with by the second connector 32 during lateral spraying, the spacing between the first section 321 and the second section 322 and the turbine blade is designed to be greater than the spacing between the third section 323 and the turbine blade. In one embodiment, the second section 322 and the first section 321 form a second angle at the connection point, which is designed to cause the structure to move backward in the horizontal direction while rising upward, thereby avoiding the platform area of ​​the turbine blade and the cooling air outlet, preventing high-temperature airflow backflow or coating particles from depositing on the surface of the connector. The third section 323 connects the second section 322 and the third connector 33, and bends upward at a third angle from the end of the second section 322, finally aligning directly above the covering device 2, thus achieving a spatial transition from horizontal clearance to vertical compression. The distance between the third section 323 and the turbine blade is, for example, 20-40 mm.

[0030] The third connector 33 extends horizontally from the end of the third section 323 of the second connector 32, that is, in a direction parallel to the extension direction of the cover device 2. Its axis is substantially perpendicular to the axial direction of the turbine blade, and it always maintains a non-contact gap with the cover device 2, for example, 10–30 mm, to avoid any physical friction or thermal contact. A screw threaded hole is provided at the free end of the third connector 33, through which a fastener 34 extends downward toward the cover device 2. This fastener 34 is preferably a threaded rod, bolt, or internally threaded pin, the end of which passes through a positioning through-hole at the top of the cover device 2 and forms a detachable threaded connection with the cover device 2. This fastener 34 can apply an axial clamping force to stably press the cover device 2 against the predetermined shielding area at the end of the turbine blade.

[0031] Figure 4 A side view of the second connector 32 of the clamping device 3 according to an embodiment of the present invention is shown. Figure 4As can be seen, the second connector 32 is positioned between the spray source and the turbine blade 4 or the edge of the turbine blade. Moreover, when viewed from the side or in the direction of the second connector 32 toward the edge of the turbine blade, the extension of the second connector 32 in the axial direction of the turbine blade is consistent with the extension of the edge of the turbine blade in the axial direction. This allows the second connector 32 to almost completely cover the edge of the turbine blade, so that the sprayed coating will not be applied to the covered edge of the turbine blade.

[0032] Figure 5 A schematic diagram of the structure of the first connector 31 of the clamping device 3 according to an embodiment of the present invention is shown. Figure 5 In this embodiment, the extending direction of the first connector 31 forms a fourth angle with the mounting surface on the fixing device 1 used to connect the first connector 31. This non-perpendicular or non-parallel arrangement can achieve the dual goals of thermal isolation and mechanical decoupling. This angle design causes the first connector 31 to extend obliquely to the side of the fixing device 1, avoiding its axis from coinciding with the heat conduction path of the fixing device 1, and significantly reducing the efficiency of heat conduction from the spraying high temperature to the connector 3 through the fixing device 1.

[0033] In a preferred embodiment, to achieve rapid assembly and reliable positioning of the connecting device 3, the fixture further includes a standardized connecting block 5, which is positioned below the highest edge of the fixing device 1. This ensures that even when the first connecting member 31 is installed on the connecting block 5, it remains below the maximum height of the fixing device 1, or flush with the maximum height or the aforementioned platform. The connecting device 3 achieves mechanical locking by inserting the lower end of the first connecting member 31 into the fixing groove 51 of the connecting block 5. The inner contour of the fixing groove 51 precisely matches the geometry of the insertion end of the first connecting member 31. For example, when the first connecting member 31 is a rectangular cross-section rod, the groove is a corresponding rectangular slot; when it is a cylindrical or irregular cross-section, the groove is designed as a contoured structure. This shape-fitting structure not only achieves gapless high-precision positioning but also provides lateral constraint force, effectively preventing the first connecting member 31 from radially shifting or rotating under spraying vibration or rotation conditions, ensuring that the connecting device 3 achieves repeatable positioning accuracy with each assembly. In addition, this plug-in structure requires no bolts, welding or bonding, enabling plug-and-play modular assembly and greatly reducing fixture replacement time.

[0034] Figure 6 A schematic diagram of the structure of the third connector 33 of the clamping device 3 according to an embodiment of the present invention is shown. Figure 6In the illustrated embodiment, the third connector 33 consists of a two-section structure of a first part 331 and a second part 332, which are coplanar and connected at a first angle to achieve precise, controllable, and non-contact clamping of the covering device 2. The first part 331 is directly connected to the end of the second connector 32, and its extension direction is consistent with the plane on which the second connector 32 is located, ensuring the mechanical continuity and rigidity transmission of the entire connection chain. The second part 332 bends and extends from the end of the first part 331, and its extension direction forms a predetermined first angle with the first part 331, so that the second part 332 can adapt to the thermal expansion difference between the covering device 2 and the turbine blades in a high-temperature environment, avoiding stress concentration or warping deformation due to expansion mismatch, and ensuring that the shielding boundary always fits. At the same time, the fourth angle between the first connector 31 and the fixing device 1 ensures that the extension direction of the first connector 31 is parallel to the first part 331 of the third connector 33 and is coplanar with the plane on which the second connector 32 is located, thereby constructing a stable and unified planar mechanical system. This three-dimensional geometric relationship enables the entire connecting device 3 to form a rigid force transmission path with low stress and zero torsion under the action of spraying vibration, thermal expansion and gravity, which improves the stability and repeatability of masking positioning, and is especially suitable for the high-frequency dynamic loads borne by turbine blades during the spraying process.

[0035] In a preferred embodiment, the end of the second portion 332 of the third connector 33 is axially connected to the cover device 2 via a fastener 34 (preferably a bolt, a threaded pin, or a snap-fit ​​lever). The second portion 332 itself is not merely a load-bearing member, but is designed to partially cover the upper surface of the cover device 2, with its edge contour matching the geometry of the covered area of ​​the cover device 2. This design provides positioning and limiting, and effectively suppresses lateral penetration of coating particles along the edge of the cover device 2 during spraying through geometric closure. Furthermore, because the second portion 332 matches the contour of the upper surface of the cover device 2, the possibility of coating being reflected back onto the turbine blades by the second portion 332 during spraying is avoided or reduced. This design also provides the convenience of aligning the cover device 2 and the third connector 33 using the aforementioned contour matching during installation, when the cover device 2 is guided to its predetermined installation position, without the need for additional auxiliary positioning fixtures.

[0036] In a preferred embodiment, during fixture assembly, the cover device 2 is first placed on the end of the turbine blade for contour assembly. Then, the connecting device 3 is inserted into the connecting block on the fixing device 1. Finally, the fasteners 34 or screws on the connecting device 3 are tightened to ensure that the connecting device 3 and the cover device 2 are securely fastened together. In one embodiment, the screws can be protected with metal rings. After coating is completed, the screws can be removed to disassemble the fixture, and then the connecting device 3 can be pulled out and the cover device 2 removed.

[0037] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0038] In the description of this invention, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A clamp for turbine blades, characterized in that, The clamp includes: Fixing device (1), wherein the blade root of the turbine blade (4) is fixed on the fixing device (1); A covering device (2) is detachably mounted on a mounting location on the turbine blade (4) to cover a predetermined area on the turbine blade (4), wherein the covering device (2) is fitted into the predetermined area in a form-fitting manner; and A connecting device (3) is connected between the covering device (2) and the fixing device (1) and holds the covering device (2) in the installation position.

2. The clamp for turbine blades according to claim 1, characterized in that, The connecting device (3) includes: A first connector (31) is connected to the fixing device (1), wherein the first connector (31) extends away from the turbine blade below the maximum height of the fixing device (1); The second connector (32), connected to the first connector (31) and spaced apart from the turbine blade (4) and the fixing device (1), extends from the first connector (31) toward the covering device (2) in a direction parallel to the edge of the turbine blade (4); and A third connector (33) extends from the end of the second connector (32) above the covering device (2) and is spaced apart from the covering device (2), wherein a fastener (34) is provided at the end of the third connector (33) away from the second connector, the fastener (34) extending downward to connect with the covering device (2).

3. The clamp for turbine blades according to claim 2, characterized in that, The third connector (33) includes: The first part (331) is connected to the second connector (32); The second part (332) extends from the first part (331), wherein the extension direction of the second part (332) forms a first angle with the extension direction of the first part (331), and is connected to the covering device (2) via the fastener, and is configured to partially cover the covering device (2), wherein the second part (332) has a profile consistent with the covered portion of the covering device (2).

4. The clamp for turbine blades according to claim 3, characterized in that, The second connector (32) includes: The first section (321) is connected to the first connector (31); The second segment (322) is connected to the first segment (321), wherein the extending direction of the first segment (321) and the extending direction of the second segment (322) form a second angle; and The third segment (323) is connected between the second segment (322) and the third connector (33), wherein the extending direction of the third segment (323) and the extending direction of the second segment (322) form a third angle. The first segment (321), the second segment (322), and the third segment (323) are located in the same plane.

5. The clamp for turbine blades according to claim 4, characterized in that, The extension direction of the first connector (31) forms a fourth angle with the surface of the fixing device (1) for connecting the first connector (31), wherein the extension direction of the first connector (31) is parallel to the extension direction of the first part (331) of the third connector (33) and parallel to the plane where the second connector (32) is located.

6. The clamp for turbine blades according to claim 1, characterized in that, The fixing device (1) only partially covers the turbine blade (4).

7. The clamp for turbine blades according to claim 2, characterized in that, The clamp also includes a connecting block (5) disposed on the fixing device (1), the connecting block (5) being located below the maximum height of the fixing device (1), wherein the connecting device (3) is fixed to the fixing device (1) by inserting the lower end of the first connecting member (31) into the connecting block (5).

8. The clamp for turbine blades according to claim 7, characterized in that, The connecting block (5) includes a fixing groove (51) that matches the shape of the insertion end of the first connector (31) into the connecting block (5).

9. The clamp for turbine blades according to any one of the preceding claims, characterized in that, The connecting device (3) exerts pressure on the covering device (2) due to gravity, so as to keep the covering device (2) in the installation position.

10. The clamp for turbine blades according to any one of the preceding claims, characterized in that, The coverage area of ​​the covering device (2) is smaller than the area of ​​the predetermined area.

11. The clamp for turbine blades according to any one of the preceding claims, characterized in that, The clamp is configured to rotate about an axis that passes through the turbine blade (4) and extends in the height direction of the fixing device (1).

12. A method for fixing turbine blades onto a fixture, characterized in that, The method includes: The turbine blade (4) is fixed to the fixing device (1); The covering device (2) is detachably mounted on the turbine blade (4) at a mounting location to cover a predetermined area of ​​the turbine blade (4), wherein the covering device (2) is fitted into the predetermined area in a form-fitting manner; and Connecting device (3) between the covering device (2) and the fixing device (1) so that the covering device (2) is held in the installation position by the connecting device (3).

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